CN113551833B - Detection module with differential pressure sensor protection structure - Google Patents
Detection module with differential pressure sensor protection structure Download PDFInfo
- Publication number
- CN113551833B CN113551833B CN202110802526.1A CN202110802526A CN113551833B CN 113551833 B CN113551833 B CN 113551833B CN 202110802526 A CN202110802526 A CN 202110802526A CN 113551833 B CN113551833 B CN 113551833B
- Authority
- CN
- China
- Prior art keywords
- pressure
- diaphragm
- guiding
- pressure sensor
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
- G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a detection module with a differential pressure sensor protection structure, which comprises a diaphragm type pressure sensor and a pressure guiding seat, wherein the diaphragm type pressure sensor is provided with two pressure transmitting cavities, the two pressure transmitting cavities are respectively connected with pressure guiding pipes, two hydraulic pressure transmitting functional parts with inner cavities are arranged on the pressure guiding seat corresponding to the two pressure guiding pipes, the inner cavities of the two hydraulic pressure transmitting functional parts are respectively communicated with the pressure guiding pipes and the pressure transmitting cavities to form two closed liquid containing cavities, the liquid containing cavities are filled with liquid pressure transmitting medium, a diaphragm type pressure sensor outer cover is provided with a closed pressure stabilizing box, a pressure stabilizing cavity is formed by a space between the pressure stabilizing box and the diaphragm type pressure sensor, the two pressure guiding pipes respectively penetrate out of the pressure stabilizing box and are connected with the hydraulic pressure transmitting functional parts, and the two pressure guiding pipes are sealed with the wall of the pressure stabilizing box. The pressure stabilizing cavity is used for being connected with an external pressure source or communicated with one of the liquid containing cavities and filled with the liquid pressure transmission medium. The invention improves the reliability of the measuring module through a simple structure.
Description
Technical Field
The present disclosure relates to pressure measuring devices, and particularly to a detection module with a differential pressure sensor protection structure.
Background
The flow meter is used for detecting the flow rate of fluid, and the detection principle is that the flow rate of fluid can be calculated by detecting the pressure values of two different points on a fluid flow path and because the pressure values of the two points are different. The body of such a flow meter is a fluid pressure sensing device and the core sensing element of the fluid pressure sensing device is a diaphragm type pressure sensor. The diaphragm type pressure sensor converts two pressure signals of different positions of fluid into changes of capacitance signals, and then a detection circuit at the rear end processes the changes of the capacitance signals to obtain differential pressure values of the external pressure.
The diaphragm type pressure sensor comprises two round cake-shaped diaphragm seats, a measuring diaphragm is arranged between the two diaphragm seats, and the two diaphragm seats are connected in butt welding mode and clamp the measuring diaphragm. Pressure transmission cavities for containing liquid pressure transmission media are respectively arranged between the measuring diaphragm and the two diaphragm seats, the two pressure transmission cavities are respectively connected with pressure transmission channels, the external pressure to be measured is introduced into the two sides of the measuring diaphragm, and the deformation of the measuring diaphragm is reflected as the change of capacitance signals.
The diaphragm pressure sensor is connected to a pressure tapping module, through which fluid pressure is transmitted to the measuring diaphragm. Because the volume change is very tiny when liquid is pressurized, when high-pressure fluid is measured, the internal pressure of the pressure transmission cavity is obviously increased, and the two membrane seats have the tendency of outward expansion deformation and mutual separation, so that the welding seam is likely to crack after long-time working in a high-pressure state, and the diaphragm type pressure sensor is in accelerated failure. For this reason, patent document CN112595450a discloses a pressure sensor sealing and stabilizing structure, after a diaphragm sensor is mounted on a pressure guiding seat, the diaphragm sensor is covered by a cover body, the cover body is in sealing connection with the pressure guiding seat to form a sealed pressure stabilizing cavity, silicone oil is filled in the pressure stabilizing cavity, and the pressure stabilizing cavity is connected with one pressure transmitting cavity by the same external pressure source, so as to form a pressure balancing system. In this way, the external pressure acts on the inside and the outside of the diaphragm type pressure sensor at the same time, so that the internal pressure and the external pressure are balanced when the sensor works, and the sensor is protected. However, this structure has some problems. Firstly, the pressure stabilizing cavity is large in size, more silicone oil is consumed, the cost is increased, and meanwhile, challenges are brought to assembly and sealing between the cover body and the pressure guiding seat. More importantly, in order to simplify the structure, the pressure stabilizing cavity is directly communicated with one of the pressure transmitting cavities in the practical design process so as to ensure the synchronous change of the internal pressure and the external pressure of the sensor, but because of more silicone oil, the volume change is not negligible in the process of thermal expansion, the pressure change of the silicone oil in the pressure transmitting cavity on one side connected with the pressure stabilizing cavity on the measuring diaphragm is obvious, and the accuracy of the sensor is also influenced. For this purpose, the pressure equalization system inside and outside the sensor and the corresponding structure must be further improved.
Disclosure of Invention
In view of the above, the present invention provides a detection module with a differential pressure sensor protection structure.
The technical scheme is as follows:
the detection module with the differential pressure sensor protection structure comprises a diaphragm type pressure sensor and a pressure guiding seat, wherein the diaphragm type pressure sensor is provided with two pressure transmitting cavities, the two pressure transmitting cavities are respectively connected with a pressure guiding pipe, the pressure guiding pipe is sealed with the outer wall of the diaphragm type pressure sensor, two corresponding pressure guiding pipes are arranged on the pressure guiding seat and are connected with two hydraulic transmission functional parts with inner cavities, the inner cavities of the two hydraulic transmission functional parts are respectively communicated with the corresponding pressure guiding pipes and the pressure transmitting cavities to form two closed liquid containing cavities, the liquid containing cavities are filled with liquid pressure transmitting mediums, and the key point is that,
the diaphragm type pressure sensor outer cover is provided with a closed pressure stabilizing box, and a pressure stabilizing cavity is formed in the space between the pressure stabilizing box and the diaphragm type pressure sensor;
the two pressure guiding pipes respectively penetrate out of the pressure stabilizing box and then are connected with the hydraulic transmission functional part, and the two pressure guiding pipes are sealed with the wall of the pressure stabilizing box;
the pressure stabilizing cavity is used for being connected with an external pressure source or communicated with one of the liquid containing cavities and filled with the liquid pressure transmission medium.
By adopting the design, the pressure stabilizing box has the advantages that the pressure stabilizing box with a compact structure is provided for the diaphragm type pressure sensor, the simplicity of the pressure guiding structure is not changed, the balance of the internal pressure and the external pressure of the diaphragm type pressure sensor is skillfully realized by introducing the external pressure into the pressure stabilizing cavity, and the reliability of the measuring module is improved.
As a preferred technical scheme, the hydraulic transmission functional part comprises a pressure guiding channel arranged on the pressure guiding seat, one end of the pressure guiding channel is communicated with the corresponding pressure guiding pipe, the other end of the pressure guiding channel is connected with a pressure guiding opening arranged on the outer wall of the pressure guiding seat, an isolation diaphragm is covered on the outer port of the pressure guiding opening in a sealing way, and each pressure transmitting cavity, the pressure guiding pipe communicated with the pressure guiding cavity, the pressure guiding channel, the pressure guiding opening and the isolation diaphragm form one liquid containing cavity.
By adopting the design, the pressure sensor has the advantages that the hydraulic transmission function part has simple structure, external pressure is transmitted to the liquid pressure transmission medium in the liquid containing cavity through the deformation of the isolation diaphragm, and finally the liquid pressure transmission medium acts on the sensing element in the diaphragm type pressure sensor, namely the measuring diaphragm.
As an optimal technical scheme, the pressure stabilizing cavity is communicated with one of the liquid containing cavities to form a first medium system.
By adopting the design, the pressure stabilizing device has the advantages that under the action of an external pressure source, the pressure in the pressure stabilizing cavity is always consistent with the pressure in one of the pressure transmitting cavities, so that the internal and external pressure balance of the diaphragm type pressure sensor is ensured.
As an preferable technical scheme, a fluid communication port is formed on the pipe wall of the pressure guiding pipe of the first medium system corresponding to the pressure stabilizing cavity, and the fluid communication port communicates the pressure guiding pipe with the pressure stabilizing cavity.
By adopting the design, the device has the advantage of ingenious and compact structure.
As a preferred technical solution, the liquid containing cavity separated from the first medium system is communicated with a liquid storage chamber to form a second medium system, and the volume of the second medium system is the same as that of the first medium system.
By adopting the design, the volumes of the liquid pressure transmission media contained in the first medium system and the second medium system are the same, when the volume of the liquid pressure transmission media is changed due to the change of the ambient temperature, the pressure change amplitude in the two pressure transmission cavities is consistent, the change of two output capacitance signals of the diaphragm type pressure sensor is consistent, and the influence of the temperature change on the measurement accuracy is avoided.
As a preferred technical solution, the two hydraulic transmission functions are respectively used for connecting an external high-pressure source and an external low-pressure source, wherein the pipe wall of the pressure guiding pipe of the hydraulic transmission function for connecting the high-pressure source is provided with the fluid communication port.
By adopting the design, the pressure in the pressure stabilizing cavity is consistent with the pressure in the pressure transmitting cavity with larger pressure all the time, so that the external pressure of the diaphragm type pressure sensor is ensured to be not less than the internal pressure all the time, and the welding part of the diaphragm type pressure sensor is prevented from being cracked due to pressure.
As an preferable technical scheme, the diaphragm type pressure sensor comprises two diaphragm seats and a measuring diaphragm, wherein the two diaphragm seats are connected in a left-right butt welding mode, the measuring diaphragm is fixedly clamped to form the diaphragm type pressure sensor with a disc-shaped outer wall, and the measuring diaphragm and the two diaphragm seats form the pressure transmission cavity in a surrounding mode;
the pressure stabilizing box is hollow and cylindrical, two ends of the pressure stabilizing box are respectively opposite to two ends of the diaphragm type pressure sensor, and the circumferential wall of the pressure stabilizing box surrounds the circumferential outer wall of the diaphragm type pressure sensor;
the two pressure guiding pipes extend out of the centers of the two membrane seats in the axial direction respectively, the two pressure guiding pipes are sealed with the two membrane seats respectively, and the two pressure guiding pipes penetrate through corresponding end parts of the pressure stabilizing box respectively;
and an abutting limiting structure is arranged between the inner walls of the two ends of the pressure stabilizing box and the outer walls of the corresponding end faces of the diaphragm type pressure sensor respectively, and the pressure stabilizing cavity outside the abutting limiting structure is a continuous cavity.
By adopting the design, the diaphragm type pressure sensor is conveniently positioned in the pressure stabilizing box through the concise structure, the installation stability of the diaphragm type pressure sensor and the pressure stabilizing box is improved, simultaneously the pressure stabilizing box plays a role of propping and restraining two diaphragm seats of the diaphragm type pressure sensor,
as a preferable technical scheme, the abutting limiting structure comprises a positioning boss and a positioning recess which are matched with each other;
and at least two positioning bosses are arranged on each end face of the diaphragm type pressure sensor, all the positioning bosses on the same end face of the diaphragm type pressure sensor are uniformly distributed around the center of the end face in the circumferential direction, and positioning pits are respectively arranged on the inner wall of the end part of the pressure stabilizing box corresponding to each positioning boss.
As a preferable technical scheme, the pressure stabilizing box comprises a cylinder, wherein the cylinder is sleeved outside the diaphragm type pressure sensor, two ends of the cylinder are respectively covered with a circular end plate, and the cylinder is respectively connected with the two circular end plates in a welding way;
the inner side surfaces of the two circular end plates are respectively provided with the positioning concave;
the two pressure guiding pipes respectively penetrate out of the circular end plate outwards and then are communicated with the corresponding pressure guiding channels.
By adopting the design, the diaphragm type pressure sensor and the pressure stabilizing box are conveniently assembled.
As a preferable technical scheme, two pressure guiding ports are respectively arranged on a pair of relatively parallel side walls of the pressure guiding seat, and a pressure taking seat is respectively arranged on the side wall of the pressure guiding seat where each pressure guiding port is positioned;
each pressure taking seat is further provided with a pressure taking channel and a pressure taking hole, the pressure taking channels are communicated with the pressure taking holes, the pressure taking holes are formed in the side wall of the pressure taking seat facing the pressure guiding seat, the pressure taking holes are opposite to the corresponding pressure guiding openings, and pressure taking areas are formed between the pressure taking holes and the corresponding isolating diaphragms.
By adopting the design, the pressure of the fluid to be tested is conveniently transferred to the hydraulic transfer functional part.
Compared with the prior art, the invention has the beneficial effects that: the pressure stabilizing box with a compact structure is provided for the diaphragm type pressure sensor, the simplicity of the pressure guiding structure is not changed, and the balance of the internal pressure and the external pressure of the diaphragm type pressure sensor is skillfully realized by introducing the external pressure into the pressure stabilizing cavity, so that the reliability of the measuring module is improved.
Drawings
FIG. 1 is a schematic diagram of a measurement module;
FIG. 2 is a schematic diagram of the mounting structure of a diaphragm pressure sensor and a pressure stabilizing box;
FIG. 3 is a schematic view of an end positioning boss of a diaphragm pressure sensor, with part of the structure of the pressure stabilizing box hidden;
FIG. 4 is a schematic diagram of the overall structure of the measurement module;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a cross-sectional view B-B of FIG. 4;
FIG. 7 is a left side view of FIG. 4;
fig. 8 is a cross-sectional view of C-C in fig. 7.
Detailed Description
The invention is further described below with reference to examples and figures.
As shown in fig. 1 and 2, a detection module with a differential pressure sensor protection structure includes a diaphragm type pressure sensor 100 and a pressure guiding seat 300, where the diaphragm type pressure sensor 100 is provided with two pressure transmitting cavities, the two pressure transmitting cavities are respectively connected with a pressure guiding tube 130, and the pressure guiding tube 130 is sealed with an outer wall of the diaphragm type pressure sensor 100. The two corresponding pressure guiding pipes 130 are connected with two hydraulic transmission functional parts with inner cavities on the pressure guiding base 300, the inner cavities of the two hydraulic transmission functional parts are respectively corresponding to the pressure guiding pipes 130 and the pressure transmission cavities, so as to form two closed liquid containing cavities, and the liquid containing cavities are filled with liquid pressure transmission media. The diaphragm pressure sensor 100 is provided with a closed pressure stabilizing box 200 in a housing, and a pressure stabilizing cavity 230 is formed by the space between the pressure stabilizing box 200 and the diaphragm pressure sensor 100. The two pressure guiding pipes 130 respectively penetrate out of the pressure stabilizing box 200 and then are connected with the hydraulic transmission functional part, and the two pressure guiding pipes 130 are sealed with the wall of the pressure stabilizing box 200. The pressure stabilizing cavity 230 is used for being connected with an external pressure source, or is communicated with one of the liquid containing cavities and is filled with the liquid pressure transmission medium, so that the pressure in the pressure stabilizing cavity 230 is close to the pressure of the pressure transmission cavity in the diaphragm type pressure sensor 100, and pressure balance is realized.
In this embodiment, the hydraulic transmission functional portion includes a pressure guiding channel 320 formed on the pressure guiding seat 300, one end of the pressure guiding channel 320 is communicated with the corresponding pressure guiding tube 130, the other end of the pressure guiding channel 320 is connected with a pressure guiding opening 330 formed on the outer wall of the pressure guiding seat 300, an isolating membrane 340 is covered on the outer port of the pressure guiding opening 330 in a sealing manner, and each pressure transmitting cavity, the pressure guiding tube 130, the pressure guiding channel 320, the pressure guiding opening 330 and the isolating membrane 340 which are communicated with each pressure transmitting cavity form one liquid containing cavity. One of the fluid-containing chambers communicates with the regulated chamber 230 such that the pressure within the regulated chamber 230 is maintained consistent with the pressure within one of the pressure-transmitting chambers.
In order to simplify the structure, in this embodiment, a fluid communication port 140 is formed on the wall of any one of the pressure guiding pipes 130 corresponding to the pressure stabilizing cavity 230, and the fluid communication port 140 communicates the pressure guiding pipe 130 with the pressure stabilizing cavity 230. After the diaphragm pressure sensor 100 is installed on the flowmeter, the two pressure transmitting cavities, the pressure guiding tube 130 and the pressure stabilizing cavity 230 are filled with liquid pressure transmitting medium, such as silicone oil. During measurement, the two pressure guiding pipes 130 are respectively connected with an external pressure source, the pressure in the pressure transmission cavity is increased, and the pressure in the pressure stabilizing cavity 230 is synchronously increased with one of the pressure transmission cavities, so that the internal pressure and the external pressure of the diaphragm type pressure sensor 100 are balanced, and the diaphragm type pressure sensor 100 is protected.
In a more compact embodiment, as shown in fig. 2, any one of the segments of the pressure guiding tube 130 located in the pressure stabilizing chamber 230 is disconnected to form the fluid communication port 140. In this way, the fluid flow path between the pressure introduction pipe 130 and the pressure stabilizing chamber 230 can be enlarged.
Because the two pressure guiding pipes 130 are respectively used for connecting an external high-pressure source and an external low-pressure source, the pipe wall of the pressure guiding pipe 130 for connecting the high-pressure source is provided with a fluid communication port 140, so that the pressure outside the diaphragm type pressure sensor 100 is always not less than the pressure inside the diaphragm type pressure sensor.
In order to make the diaphragm-type pressure sensor 100 and the pressure stabilizing box 200 compact, the shape of the inner wall of the pressure stabilizing box 200 is matched with the shape of the outer wall of the diaphragm-type pressure sensor 100, the inner wall of the pressure stabilizing box 200 is close to the part of the outer wall of the diaphragm-type pressure sensor 100 opposite to the inner wall, so that a pressure stabilizing cavity 230 surrounding the diaphragm-type pressure sensor 100 is formed, and the pressure stabilizing cavity 230 is a thin-layer cavity.
As shown in fig. 2, the pressure stabilizing box 200 is provided with pressure guiding tube through holes corresponding to each pressure guiding tube 130, a pressure guiding tube sleeve 240 is fixedly arranged in each pressure guiding tube through hole, the pressure guiding tube 130 is arranged in each pressure guiding tube sleeve 240 in a penetrating manner, and the pressure guiding tube sleeve 240 is sealed with the pressure guiding tube 130 and the pressure stabilizing box 200.
The length of the pressure guiding tube sleeve 240 is greater than the wall thickness of the pressure stabilizing box 200, and the outer end of the pressure guiding tube sleeve 240 extends out of the pressure stabilizing box 200. The pressure guiding pipe sleeve 240 with a longer length plays a better supporting and positioning role on the pressure guiding pipe 130, prevents the pressure guiding pipe 130 from shaking and shifting, avoids the joint of the pressure guiding pipe 130 and the diaphragm type pressure sensor 100 from being pulled and damaged when external force acts, and is beneficial to the diaphragm type pressure sensor 100 in suspension arrangement to keep stable.
The pressure guiding tube via hole is a step hole with larger inner end aperture, the inner end tube wall of the pressure guiding tube sleeve 240 is thickened radially to form a tube wall step 241, and the tube wall step 241 is matched with the step hole. In this way, the stability of the fit between the pressure guiding tube sleeve 240 and the pressure stabilizing box 200 is improved, the pressure guiding tube sleeve 240 is prevented from being pressed out under the pressure action of the liquid pressure transmission medium in the pressure stabilizing box 200, and the tightness is also improved.
In this embodiment, the diaphragm pressure sensor 100 includes two diaphragm seats 110 and a measuring diaphragm 120, where the two diaphragm seats 110 are butt-welded, and the measuring diaphragm 120 is fixedly clamped, so as to form the diaphragm pressure sensor 100 with a disc-shaped outer wall, and a pressure transmitting cavity is defined between the measuring diaphragm 120 and the two diaphragm seats 110. The pressure stabilizing box 200 is hollow and cylindrical, the pressure stabilizing box 200 comprises a cylinder 210, the cylinder 210 is sleeved outside the diaphragm type pressure sensor 100, two ends of the cylinder 210 are respectively covered with a circular end plate 220, the cylinder 210 is respectively welded with the two circular end plates 220, and the two circular end plates 220 are respectively opposite to the two ends of the diaphragm type pressure sensor 100.
The two pressure guiding pipes 130 extend from the center axes of the two membrane holders 110, the two pressure guiding pipes 130 are sealed with the two membrane holders 110, and the two pressure guiding pipes 130 pass through the corresponding circular end plates 220.
In order to enable the diaphragm type pressure sensor 100 to be positioned in the pressure stabilizing box 200 more stably, an abutting limiting structure is respectively arranged between the inner walls of two ends of the pressure stabilizing box 200 and the outer walls of the corresponding end faces of the diaphragm type pressure sensor 100. In order to make the liquid pressure on the two end surfaces of the diaphragm type pressure sensor 100 be the same, the areas of the two end surfaces of the diaphragm type pressure sensor 100 outside the occupied position of the abutting limiting structure are equal. Further, the abutting limiting structures at two ends of the diaphragm type pressure sensor 100 are right and left opposite, and are symmetrical with respect to the measuring diaphragm 120. In this way, the liquid pressure applied to both end surfaces of the diaphragm pressure sensor 100 and the abutting force from the pressure stabilizing case 200 are uniform and symmetrical.
As shown in fig. 2 and 3, the abutment limiting structure includes a positioning boss 111 and a positioning recess 221, which are matched with each other, one of which is located on the end surface of the diaphragm type pressure sensor 100, and the other of which is located on the inner wall of the end portion of the pressure stabilizing box 200.
In this embodiment, the positioning boss 111 is located on an end face of the diaphragm type pressure sensor 100, at least two positioning bosses 111 are disposed on each end face of the diaphragm type pressure sensor 100, all the positioning bosses 111 located on the same end face of the diaphragm type pressure sensor 100 are uniformly distributed circumferentially around the center of the end face, and positioning recesses 221 are respectively disposed on an inner wall of an end portion of the pressure stabilizing box 200 corresponding to each positioning boss 111.
In order to distribute the abutting force of the pressure stabilizing box 200 received on the end face of the diaphragm type pressure sensor 100 as uniformly as possible. Each end face of the diaphragm pressure sensor 100 is provided with at least two arc-shaped positioning bosses 111, the positioning bosses 111 on the same end face are located on the same ring, and the positioning bosses 111 on the same end face are uniformly distributed circumferentially around the corresponding pressure guiding tube 130. In this embodiment, two arc-shaped positioning bosses 111 are provided on each end face of the diaphragm pressure sensor 100. As shown in fig. 3, the notches between the positioning bosses 111 on the same end face communicate the inner area and the outer area of the ring surrounded by all the positioning bosses 111, so as to form a channel for the flow of the liquid pressure medium.
As shown in fig. 2 and 3, a pressure guiding seat 300 is disposed below the pressure stabilizing box 200, a positioning groove 310 is formed on the upper surface of the pressure guiding seat 300, the bottom of the positioning groove 310 is an arc surface with an upward concave surface, the pressure stabilizing box 200 is disposed in the positioning groove 310, the lower portion of the pressure stabilizing box 200 is disposed in the positioning groove 310, the cylinder 210 falls on the bottom of the positioning groove 310, and two circular end plates 220 are respectively close to two side groove walls of the positioning groove 310. Since the diaphragm pressure sensor 100 is not in direct contact with the pressure guiding seat 300 and is surrounded by the liquid pressure transmitting medium in the pressure stabilizing chamber 230, it is suspended with respect to the pressure guiding seat 300.
The pressure guiding seat 300 is provided with two pressure guiding channels 320, the two pressure guiding channels 320 are respectively located at two sides of the positioning groove 310, and the two pressure guiding channels 320 are in one-to-one correspondence and connected with the two pressure guiding pipes 130.
As shown in fig. 1 to 3, a pressure guiding pipe socket 321 is disposed at one end of the pressure guiding channel 320 near the pressure stabilizing box 200, and the pressure guiding pipe socket 321 is located below the corresponding pressure guiding pipe sleeve 240. The pressure guiding pipe 130 includes a horizontal section 131, a vertical section 133, and a curved section 132. The inner end of the horizontal segment 131 communicates with the corresponding chamber of the diaphragm-type pressure sensor 100, and the outer end of the horizontal segment 131 passes outwardly through the housing of the diaphragm-type pressure sensor 100 and then out through the catheter tube 240. The vertical section 133 is disposed right below the pressure guiding tube sleeve 240, the bending section 132 is connected between the upper end of the vertical section 133 and the outer end of the horizontal section 131, the lower end of the vertical section 133 is inserted into the corresponding pressure guiding tube socket 321, and the lower end of the vertical section 133 is sealed with the corresponding pressure guiding tube socket 321. The curved section 132 is first extended away from the horizontal section 131 while being downwardly offset, and then gradually retracted toward the horizontal section 131 and connected to the vertical section 133. This structural design of the pressure tube 130 has the following reasons: because the pressure stabilizing box 200 has a thinner wall thickness, the pressure guiding pipe sleeve 240 with a relatively larger length ensures that the horizontal segment 131 is stably arranged on the pressure stabilizing box 200 through the pressure guiding pipe sleeve 240; meanwhile, since the position of the vertical section 133 is defined by the crimp tube socket 321, after the crimp tube socket 240 having a relatively large length is provided, the horizontal section 131 and the vertical section 133 cannot be directly connected through a tube body bent at right angles, and the bent section 132 in the present embodiment must be used to connect the horizontal section 131 and the vertical section 133.
As can be seen by referring to fig. 4 and 5, the pressure guiding channel 320 includes a horizontal pressure guiding section and a vertical pressure guiding section, wherein the upper end of the vertical pressure guiding section is provided with a pressure guiding pipe socket 321, the pressure guiding pipe socket 321 is sealed with the inner wall of the vertical pressure guiding section, the lower end of the vertical pressure guiding section is connected with one end of the horizontal pressure guiding section, and the other end of the horizontal pressure guiding section is opened on the outer side wall of the pressure guiding seat 300. The outer wall of the pressure guiding seat 300 is provided with pressure guiding ports 330 corresponding to the two horizontal pressure guiding sections respectively, the pressure guiding ports 330 are reducing holes, the aperture of the pressure guiding ports 330 is gradually reduced from outside to inside, and the inner ends of the pressure guiding ports 330 are communicated with the outer ends of the horizontal pressure guiding sections. The outer end of the pressure inlet 330 is covered with an isolation diaphragm 340, and the isolation diaphragm 340 seals the outer end of the pressure inlet 330. Each pressure guiding channel 320 is connected with a liquid injection hole, one end of the liquid injection hole is communicated with the corresponding pressure guiding channel 320, the other end of the liquid injection hole is opened on the surface of the pressure guiding seat 300, and a detachable plug is arranged at the outer end of the liquid injection hole. The liquid filling holes are used for filling liquid pressure medium into the corresponding liquid containing cavities respectively.
One of the liquid containing cavities is connected with one pressure stabilizing cavity 230, so that the volumes of liquid pressure transmission media contained in the two media systems are different. When the ambient temperature changes, the volume changes of the liquid pressure transmission media in the two media systems are inconsistent, which may cause different pressure change amplitudes in the pressure transmission cavities at two sides, so that the capacitance changes of the measurement diaphragm 120 are different. In this case, the pressure imbalance on both sides of the sensor is caused by the change of the ambient temperature, and the measurement accuracy is affected. For this purpose, the liquid containing cavity without the pressure stabilizing cavity 230 is modified, as shown in fig. 1 and 6, a liquid storage chamber 350 is formed on the bottom surface of the pressure guiding seat 300, and a sealing plug is disposed on the opening in the liquid storage chamber 350. The liquid storage chamber 350 is communicated with the liquid containing cavity, the volume of the liquid storage chamber 350 is approximately the same as the volume of the pressure stabilizing cavity 230, so that the volumes of the liquid pressure transmission media contained in the two media systems are close to each other, the pressure change amplitude of the liquid pressure transmission media at two sides of the measuring diaphragm 120 is consistent when the temperature is changed, and the measuring deviation caused by the environmental temperature change is balanced. In this embodiment, a liquid storage flow channel 360 is opened between the liquid storage chamber 350 and the corresponding pressure guiding port 330, and the volume of a medium system formed by the liquid storage chamber 350, the liquid storage flow channel 360, the pressure guiding channel 320 connected with the liquid storage chamber, the pressure guiding pipe 130 and the pressure transmitting cavity is consistent with the volume of another medium system.
As can be seen in fig. 4 to 8, the openings of the two pressure guiding ports 330 are relatively arranged on a pair of relatively parallel side walls of the pressure guiding seat 300, a pressure taking seat 400 is respectively arranged on the side wall of the pressure guiding seat 300 where the pressure guiding ports 330 are located, and the two pressure taking seats 400 are connected with the pressure guiding seat 300 through bolts, so that a measuring module of the flowmeter is formed with the sensor module. Each pressure taking seat 400 is further provided with a pressure taking channel 410 and a pressure taking hole 420, wherein the pressure taking channel 410 is communicated with the pressure taking hole 420, the pressure taking hole 420 is formed on the side wall of the pressure taking seat 400 facing the pressure guiding seat 300, the pressure taking hole 420 is opposite to the corresponding pressure guiding opening 330, and a pressure taking area is formed between the pressure taking hole 420 and the corresponding isolating diaphragm 340.
As shown in fig. 1 and 2, signal leads 150 are led out from two sides of the measuring diaphragm 120, and two signal leads 150 are also led out from two membrane holders 110 in a sealing manner, where the two signal leads 150 are disposed along a direction parallel to the axis of the membrane holders 110. Each of the circular end plates 220 has a wire connector tube 250 integrally formed on an outer wall thereof, the wire connector tube 250 is perpendicular to the circular end plates 220, an inner end of the wire connector tube 250 is connected with the circular end plates 220, a wire through hole is formed in the circular end plates 220, the wire through hole and the wire connector tube 250 share a hole core line, and a hole diameter of the wire through hole is smaller than an inner diameter of the wire connector tube 250. The wire connector tube 250 is embedded with a wire connector 260, the wire connector 260 and the wire through hole are internally penetrated with the signal wire 150, and the wire connector 260 seals the wire through hole.
The assembly structure of the pressure stabilizing box 200 is adapted to the diaphragm type pressure sensor 100. In assembly, the cylinder 210 is sleeved outside the diaphragm pressure sensor 100, and then two circular end plates 220 are respectively sleeved on the corresponding signal leads 150 and the horizontal section 131, and gradually move towards the corresponding ends of the cylinder 210 and are welded against the corresponding ends. The signal lead 150 is designed to be parallel to the axis of the diaphragm seat 110, which is to facilitate the assembly of the pressure stabilizing case 200 outside the diaphragm-type pressure sensor 100.
In measurement, the two pressure-taking channels 410 are respectively connected with two points on the fluid flow path, fluids at two different points enter corresponding pressure-taking areas, fluid pressure acts on the corresponding isolation diaphragms 340 and is conducted to the measurement diaphragm 120 through the liquid pressure-transmitting medium, so that the fluid pressure at two points is measured, and the fluid flow is calculated.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a detection module with differential pressure sensor protection architecture, includes diaphragm formula pressure sensor (100) and draws pressure seat (300), and this diaphragm formula pressure sensor (100) are equipped with two and pass pressure cavity, and two pass pressure cavity are connected with respectively and draw pressure pipe (130), draw pressure pipe (130) with the outer wall of diaphragm formula pressure sensor (100) is sealed, corresponds two draw pressure pipe (130) draw pressure seat (300) on be equipped with two and have the hydraulic pressure transmission functional unit of inner chamber, two the inner chamber of hydraulic pressure transmission functional unit respectively with corresponding draw pressure pipe (130) and pass pressure cavity intercommunication in order to form two confined flourishing liquid cavity, flourishing liquid cavity is filled with liquid pressure medium, its characterized in that:
the diaphragm type pressure sensor (100) is provided with a closed pressure stabilizing box (200) in an outer cover, and a pressure stabilizing cavity (230) is formed by the space between the pressure stabilizing box (200) and the diaphragm type pressure sensor (100);
the two pressure guiding pipes (130) respectively penetrate out of the pressure stabilizing box (200) and then are connected with the hydraulic transmission functional part, and the two pressure guiding pipes (130) are sealed with the wall of the pressure stabilizing box (200);
the pressure stabilizing cavity (230) is communicated with one of the liquid containing cavities and is filled with the liquid pressure transmission medium to form a first medium system;
the hydraulic transmission functional part comprises a pressure guiding channel (320) arranged on the pressure guiding seat (300), one end of the pressure guiding channel (320) is communicated with the corresponding pressure guiding pipe (130), the other end of the pressure guiding channel (320) is connected with a pressure guiding opening (330) arranged on the outer wall of the pressure guiding seat (300), an isolation diaphragm (340) is covered on the outer port of the pressure guiding opening (330) in a sealing way, and each pressure transmitting cavity, the pressure guiding pipe (130), the pressure guiding channel (320), the pressure guiding opening (330) and the isolation diaphragm (340) which are communicated with each other form a liquid containing cavity;
the liquid containing cavity separated from the first medium system is communicated with a liquid storage chamber (350) to form a second medium system, and the second medium system has the same volume as the first medium system, so that when the volume of the liquid pressure transmission medium changes due to the change of the ambient temperature, the pressure change amplitude in the two pressure transmission cavities is consistent;
the pipe wall of the pressure guiding pipe (130) of the first medium system is provided with a fluid communication port (140) corresponding to the pressure stabilizing cavity (230), and the fluid communication port (140) is used for communicating the pressure guiding pipe (130) with the pressure stabilizing cavity (230).
2. The detection module with differential pressure sensor protection architecture of claim 1, wherein: the two hydraulic transmission functions are respectively used for connecting an external high-pressure source and an external low-pressure source, wherein the pipe wall of a pressure guiding pipe (130) of the hydraulic transmission function part for connecting the high-pressure source is provided with the fluid communication port (140).
3. The detection module with differential pressure sensor protection architecture of claim 1, wherein: the diaphragm type pressure sensor (100) comprises two diaphragm bases (110) and a measuring diaphragm (120), wherein the two diaphragm bases (110) are connected in a butt welding mode, the measuring diaphragm (120) is fixedly clamped to form the diaphragm type pressure sensor (100) with a disc-shaped outer wall, and the measuring diaphragm (120) and the two diaphragm bases (110) enclose a pressure transmission cavity;
the pressure stabilizing box (200) is hollow and cylindrical, two ends of the pressure stabilizing box (200) are respectively opposite to two ends of the diaphragm type pressure sensor (100), and the circumferential wall of the pressure stabilizing box (200) surrounds the circumferential outer wall of the diaphragm type pressure sensor (100);
the two pressure guiding pipes (130) extend out of the centers of the two membrane seats (110) in the axial direction respectively, the two pressure guiding pipes (130) are sealed with the two membrane seats (110) respectively, and the two pressure guiding pipes (130) penetrate through corresponding ends of the pressure stabilizing box (200) respectively;
and a propping limiting structure is respectively arranged between the inner walls of the two ends of the pressure stabilizing box (200) and the outer walls of the corresponding end faces of the diaphragm type pressure sensor (100), and the pressure stabilizing cavity (230) outside the propping limiting structure is a continuous cavity.
4. A detection module with differential pressure sensor protection architecture according to claim 3, characterized in that: the abutting limiting structure comprises a positioning boss (111) and a positioning recess (221) which are matched with each other;
at least two positioning bosses (111) are arranged on each end face of the diaphragm type pressure sensor (100), all the positioning bosses (111) located on the same end face of the diaphragm type pressure sensor (100) are uniformly distributed around the center of the end face in a circumferential direction, and positioning depressions (221) are respectively arranged on the inner wall of the end part of the pressure stabilizing box (200) corresponding to each positioning boss (111).
5. The detection module with differential pressure sensor protection architecture of claim 4, wherein: the pressure stabilizing box (200) comprises a cylinder (210), the cylinder (210) is sleeved outside the diaphragm type pressure sensor (100), two ends of the cylinder (210) are respectively covered with a circular end plate (220), and the cylinder (210) is respectively welded with the two circular end plates (220);
the inner side surfaces of the two circular end plates (220) are respectively provided with the positioning concave parts (221);
the two pressure guiding pipes (130) respectively penetrate out of the circular end plate (220) and then are communicated with the corresponding pressure guiding channels (320).
6. The detection module with differential pressure sensor protection architecture of claim 1, wherein: the two pressure guiding ports (330) are respectively arranged on a pair of parallel side walls of the pressure guiding seat (300), and a pressure taking seat (400) is respectively arranged on the side wall of the pressure guiding seat (300) where each pressure guiding port (330) is positioned;
each pressure taking seat (400) is further provided with a pressure taking channel (410) and a pressure taking hole (420), the pressure taking channel (410) is communicated with the pressure taking hole (420), the pressure taking hole (420) is formed in the side wall, facing the pressure guiding seat (300), of the pressure taking seat (400), the pressure taking hole (420) is opposite to the corresponding pressure guiding opening (330), and a pressure taking area is formed between the pressure taking hole (420) and the corresponding isolation diaphragm (340).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802526.1A CN113551833B (en) | 2021-07-15 | 2021-07-15 | Detection module with differential pressure sensor protection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802526.1A CN113551833B (en) | 2021-07-15 | 2021-07-15 | Detection module with differential pressure sensor protection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113551833A CN113551833A (en) | 2021-10-26 |
| CN113551833B true CN113551833B (en) | 2023-06-30 |
Family
ID=78131832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110802526.1A Active CN113551833B (en) | 2021-07-15 | 2021-07-15 | Detection module with differential pressure sensor protection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113551833B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543931A (en) * | 2022-01-26 | 2022-05-27 | 沈阳众盛自动化科技有限公司 | Gas sensor and gas relay provided with gas sensor |
| CN114608740B (en) * | 2022-03-10 | 2024-10-15 | 南京闻科信息科技有限公司 | Oil pressure seat with pressure gauge protection function for oil field |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100545583C (en) * | 2005-05-27 | 2009-09-30 | 上海自动化仪表股份有限公司 | A kind of differential pressure, pressure, temperature simultaneously measuring multi-parameter sensor |
| DE102014119407A1 (en) * | 2014-12-22 | 2016-06-23 | Endress + Hauser Gmbh + Co. Kg | Differential pressure sensor and differential pressure transducer with such a differential pressure sensor |
| CN209197971U (en) * | 2018-12-14 | 2019-08-02 | 上海恩邦自动化仪表有限公司 | The direct outlet pressure transmitter of metal capacitance |
| CN111487006B (en) * | 2020-04-16 | 2021-07-20 | 南京高华科技股份有限公司 | Micro differential pressure sensor based on stress isolation structure |
| CN112595450A (en) * | 2020-12-29 | 2021-04-02 | 重庆市伟岸测器制造股份有限公司 | Pressure sensor seals steady voltage structure |
-
2021
- 2021-07-15 CN CN202110802526.1A patent/CN113551833B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113551833A (en) | 2021-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113551833B (en) | Detection module with differential pressure sensor protection structure | |
| CN101509817B (en) | Differential fluid pressure measurement apparatus | |
| CN215865630U (en) | Pressure balance system of differential pressure sensor | |
| WO2023284552A1 (en) | Pressure balance system of differential pressure sensor | |
| CN112665771A (en) | Isolated pressure sensor | |
| CN215865629U (en) | Pressure guiding structure of suspension type differential pressure sensor | |
| CN215865607U (en) | Compact pressure sensing module | |
| CN215865631U (en) | External pressure retaining mechanism of suspension type differential pressure sensor | |
| CN215865608U (en) | Pressure sensing module and assembly structure | |
| CN214373070U (en) | Isolated pressure sensor | |
| CN113670503A (en) | Compact pressure sensing module | |
| CN215865632U (en) | Pressure stabilizing structure of pressure difference sensor membrane seat | |
| CN114414131A (en) | Wide-range pressure measurement diaphragm capsule | |
| WO2015162113A1 (en) | Differential pressure sensor | |
| CN216050422U (en) | Pressure equalization system | |
| CN215865606U (en) | Pressure balancing structure of pressure sensing module | |
| CN204903076U (en) | Many field device flange | |
| CN217542227U (en) | Three-way pressure-taking connecting flange | |
| CN215865618U (en) | Equal distribution system for pressure-inducing medium | |
| CN116337285B (en) | Metal capacitive pressure sensor | |
| CN216717672U (en) | Wide-range pressure measuring diaphragm capsule | |
| CN216925887U (en) | Isolated force transmission device | |
| CN113654713A (en) | Pressure balance system | |
| CN116337286B (en) | Sensor bellows and metal capacitive pressure sensor | |
| CN216717668U (en) | Industrial pressure measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |