JP2022126506A - Valve with leakage detection function and leakage detection device - Google Patents

Abstract

To provide a valve with a leakage detection function which can detect leakage during use and achieve downsizing and reduction of costs, and to provide a leakage detection device.SOLUTION: A valve with a leakage detection function has: an inlet side connection port into which a fluid flows; and an outlet side connection port from which the fluid flows. A valve body 30 is connected to the inlet side connection port and the outlet side connection port and may open or close a passage between the inlet side connection port and the outlet side connection port. A check valve part is provided at the downstream of the valve body 30, closes in normal conditions, and opens when the fluid from the valve body 30 has a predetermined pressure or higher. A valve chamber 23 is provided at a passage between the valve body 30 and the check valve part. A pressure detection part 50 may detect pressure change in the valve chamber 23.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a valve with a leak detection function and a leak detection device.

Conventionally, there are a diaphragm type two-way solenoid valve shown in FIG. 1 and a poppet type two-way solenoid valve shown in FIG. The solenoid valve shown in FIGS. 1 and 2 has an inlet side connection port 2 and an outlet side connection port 3 in a valve box 1 . A valve body of the solenoid valve has an actuator 4 and a valve seat 5 in a flow path between the inlet side connection port 2 and the outlet side connection port 3 . In the actuator 4, when a current flows through the coil 6, the fixed iron core 7 and the movable iron core 8 are magnetized, the movable iron core 8 is attracted to the fixed iron core 7 against the coil spring 9, and is connected to the movable iron core 8. A valve body 10 opens the valve seat 5 and allows fluid to flow. The diaphragm type actuator 4 is separated from the flow path by the diaphragm 11 .

When the current supply to the coil 6 is stopped, the fixed core 7 and the movable core 8 are demagnetized, and the movable core 8 is separated from the fixed core 7 by the repulsive force of the coil spring 9 installed inside the movable core 8. , the valve body 10 connected to the armature 8 closes the valve seat 5 and stops the flow of fluid. At this time, if one or both of the valve body 10 and the valve seat 5 are damaged, or if foreign matter flowing from upstream is caught between the valve body 10 and the valve seat 5, the fluid flow is completely closed. As a result, internal leakage (leakage from the valve seat 5) occurs, causing problems such as pressure rise and liquid dripping in the device.

A possible solution to this problem is that the solenoid-operated flow control valve, the solenoid-operated on-off valve, and the pressure transducer are located in a common housing, connected to a common electrical receptacle, and the pressure transducer is discloses that during a leak test in which a negative pressure is introduced into the system, the differential pressure across the metering orifice is detected to measure the flow rate passing through the metering orifice (see, for example, Patent Document 1).

JP 2004-68814 A

However, the electromagnetic valve described in Patent Document 1 has a problem that leakage is detected during a leakage test, and leakage is not detected during use. Moreover, since it has two electromagnetic valves, there existed the subject that size was large and it became expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and provides a valve with a leak detection function and a leak detection device that can detect a leak during use and that can be made compact and inexpensive. The purpose is to

In order to achieve the above object, a valve with a leak detection function according to the present invention comprises an inlet-side connection port for inflowing fluid, an outlet-side connection port for discharging the fluid, and a connection between the inlet-side connection port and the outlet-side connection port. a valve body connected to the port and capable of opening and closing a flow path between the inlet-side connection port and the outlet-side connection port; A check valve portion that opens when the fluid has a predetermined pressure or higher, a valve chamber provided in a flow path between the valve body and the check valve portion, and pressure fluctuations inside the valve chamber can be detected. and a pressure detection unit.

In the valve with a leak detection function according to the present invention, when the valve body is opened, the fluid flows in from the inlet side connection port, passes through the valve body, the valve chamber, and the check valve portion in order, and is discharged from the outlet side connection port. . When the valve body closes, fluid stops. At this time, since the check valve portion is normally closed, the valve chamber is sealed. The pressure detector detects pressure fluctuations inside the valve chamber. If there is no leakage of the valve body, the pressure inside the sealed valve chamber does not change from the state when the valve body is closed. If there is a leak in the valve body, the pressure inside the valve chamber rises from the state when the valve body is closed, so the leak can be detected from the pressure gradient. In this way, it is possible to detect leakage during use, and it is possible to reduce the size and cost by selecting the valve body and the check valve portion.

In the valve with a leak detection function according to the present invention, the check valve portion includes a valve seat provided in a flow path between the valve main body and the outlet-side connection port, and the a valve body capable of opening and closing a valve seat, and urging the valve body toward the valve seat so as to normally close the valve seat and open the valve seat when the fluid from the valve body exceeds a predetermined pressure. It is preferred to have a coil spring.
In this case, since the check valve portion has a simple configuration including the valve seat, the valve body, and the coil spring, it is possible to reduce the size and cost.

A valve with a leak detection function according to the present invention has a valve box that has the inlet-side connection port and the valve chamber and accommodates the check valve portion therein, and the check valve portion is on the outlet side. a connection port; the pressure detection unit having a pressure detector, a lead wire, and a lid; the pressure detector having a configuration capable of detecting pressure fluctuations inside the valve chamber; It is connected to the pressure detector so as to output a detection signal of the pressure detector to the outside, and the lid is attached to the outer surface of the valve box and accommodates the pressure detector between the valve box and the lid. is preferred.
In this case, since the pressure detector is integrated, further miniaturization can be achieved.
In the valve with leak detection function according to the present invention, the valve body is composed of a diaphragm type solenoid valve or a poppet type solenoid valve.

A leak detection device according to the present invention is a leak detection device that can be attached to a valve, wherein the valve includes an inlet-side connection port for inflowing fluid, an outlet-side connection port for discharging the fluid, and the inlet-side connection port. A valve connected to the outlet-side connection port, including a valve body connected to the port and the outlet-side connection port, and capable of opening and closing a flow path between the inlet-side connection port and the outlet-side connection port. a chamber, a check valve portion connected to the valve chamber, closed in a normal state and opened when the pressure of the fluid flowing in from the outlet side connection port exceeds a predetermined pressure, and a pressure fluctuation inside the valve chamber can be detected. and a pressure detection unit.
The leak detection device according to the present invention is used by being attached to the outlet side connection port of the valve, and can detect leaks during use of the valve. Since the leak detection device according to the present invention has a simple configuration, it can be made compact and inexpensive.

Advantageous Effects of Invention According to the present invention, it is possible to provide a valve with a leak detection function and a leak detection device that are capable of detecting leakage during use and that can be made smaller and less expensive.

1 is a longitudinal sectional view showing a conventional diaphragm-type two-way solenoid valve; FIG. FIG. 2 is a longitudinal sectional view showing a conventional poppet type two-way solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the valve with a leak detection function of embodiment of this invention. FIG. 4 is a vertical cross-sectional view of the valve with a leak detection function shown in FIG. 3 in a direction intersecting perpendicularly; BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the valve with a leak detection function of embodiment of this invention. 4 is a graph showing pressure changes in the valve chamber when there is no leakage in the valve with a leak detection function according to the embodiment of the present invention; 4 is a graph showing pressure changes in the valve chamber when there is a leak in the valve with a leak detection function according to the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below based on the drawings.
A valve with a leak detection function according to an embodiment of the present invention is an electromagnetic valve suitable for fluid control of a clinical laboratory test apparatus such as an automatic biochemical analyzer.
As shown in FIGS. 3 to 5, the valve with a leak detection function has a valve body 20, a valve body 30, a check valve section 40, and a pressure detection section .
The valve box 20 has an inlet-side connection port 21 that allows fluid to flow therein. The valve body 30 has the structure of a diaphragm type two-way solenoid valve. However, the valve body 30 may be composed of a poppet type solenoid valve.

The valve body 30 is provided integrally with the valve box 20 and connected to the inlet side connection port 21 and the outlet side connection port 22 . The valve body 30 has a main valve seat 31 in the flow path between the inlet-side connection port 21 and the outlet-side connection port 22 . The valve body 30 has an actuator 32 , a main valve body 33 and a diaphragm 34 . The actuator 32 is housed within a frame 35 and has a coil 36 , a fixed iron core 37 , a movable iron core 38 and a coil spring 39 . The main valve body 33 is made of a rubber elastic body and connected to a movable iron core 38 . The movable iron core 38 is urged by a coil spring 39 installed inside the movable iron core 38 to move toward the main valve seat 31 and away from the fixed iron core 37 . A diaphragm 34 separates the actuator 32 from the flow path.

In the actuator 32, when a current flows through the coil 36, the fixed iron core 37 and the movable iron core 38 are magnetized, the movable iron core 38 is attracted to the fixed iron core 37 against the coil spring 39, and the main valve body 33 becomes the main valve seat. 31 is opened to allow the fluid to flow. When the current supply to the coil 36 is stopped, the fixed iron core 37 and the movable iron core 38 are demagnetized. to block the flow of fluid. Thereby, the valve body 30 can open and close the channel between the inlet-side connection port 21 and the outlet-side connection port 22 .

The check valve portion 40 is housed inside the valve box 20 and provided downstream of the valve body 30 . The check valve portion 40 has a joint 41 , a valve seat 42 , a valve body 43 , a piston 44 and a coil spring 45 . The joint 41 has an outlet side connection port 22 for discharging fluid. The valve seat 42 is provided in the flow path between the valve body 30 and the outlet side connection port 22 . The valve body 43 is made of a rubber elastic body, and can open and close the valve seat 42 from the outlet side connection port 22 side. The valve body 43 is fixed to the tip of the piston 44 . A piston 44 is provided so that its rear part reciprocates inside the joint 41 . The coil spring 45 normally closes the valve seat 42 and urges the valve body 43 toward the valve seat 42 so as to open the valve seat 42 when the pressure of the fluid from the valve body 30 exceeds a predetermined value.
The valve box 20 internally has a valve chamber 23 provided in a flow path between the valve main body 30 and the check valve portion 40 .

The pressure detector 50 has a pressure detector 51 , a lead wire 52 and a lid 53 . The pressure detector 51 has a configuration capable of detecting pressure fluctuations inside the valve chamber 23 . The lead wire 52 is connected to the pressure detector 51 so as to supply a voltage to the pressure detector 51 and output a detection signal corresponding to the pressure of the pressure detector 51 to the outside. The lid 53 is attached to the outer surface of the valve box 20 and accommodates the pressure detector 51 between the lid 53 and the valve box 20 .

Next, the action will be described.
In the valve with a leak detection function, when the main valve body 33 of the valve body 30 opens the main valve seat 31 , the fluid flows in from the inlet side connection port 21 and flows through the valve body 30 , the valve chamber 23 and the check valve portion 40 . It is discharged from the outlet-side connection port 22 of the check valve portion 40 in order. When the main valve body 33 of the valve body 30 closes the main valve seat 31, the fluid stops. At this time, the valve body 43 of the check valve portion 40 is biased by the coil spring 45 to close the valve seat 42 in the normal state, so that the valve chamber 23 is sealed.

The pressure detector 50 detects pressure fluctuations inside the valve chamber 23 . If there is no valve seat leakage from the valve body 30, the pressure inside the sealed valve chamber 23 does not change from the state when the valve body 30 is closed, as shown in FIG. If there is a valve seat leak in the valve body 30, the pressure inside the valve chamber 23 rises from the state when the valve body 30 is closed, as shown in FIG. can. In this way, leakage during use can be detected, and by selecting the valve body 30 and the check valve portion 40, miniaturization and cost reduction can be achieved. Since the check valve portion 40 has a simple configuration including the valve seat 42, the valve body 43, and the coil spring 45, it can be made particularly compact and inexpensive. Further, since the pressure detector 51 is integrated with the valve box 20 and the valve main body 30, further miniaturization can be achieved.

The valve chamber 23 and the check valve section 40 are separated from the valve box 20 and integrated with the pressure detection section 50 to form a leakage detection device that can be attached to a valve such as the solenoid valve shown in FIGS. good too. In this case, the valve chamber 23 is connected to the outlet side connection port 3 of the valve, and the check valve portion 40 is connected to the valve chamber 23 and closed in a normal state, so that the fluid flowing in from the outlet side connection port 3 has a predetermined pressure or higher. It is configured to open when The pressure detection unit 50 is provided so as to be able to detect pressure fluctuations inside the valve chamber 23 .
In this case, the leakage detection device is used by being attached to the outlet side connection port 3 of a valve such as a commercially available electromagnetic valve, and can detect leakage during use of the valve. Since the leak detection device has a simple structure, it can be made compact and inexpensive.

Reference Signs List 1 valve body 2 inlet connection port 3 outlet connection port 4 actuator 5 valve seat 6 coil 7 stationary core 8 movable core 9 coil spring 10 valve body 11 diaphragm 20 valve body 21 inlet side connection port 22 outlet side connection port 23 valve chamber 30 valve body 31 main valve seat 32 actuator 33 main valve body 34 diaphragm 35 frame 36 coil 37 fixed iron core 38 movable iron core 39 Coil spring 40 Check valve part 41 Joint 42 Valve seat 43 Valve body 44 Piston 45 Coil spring 50 Pressure detector 51 Pressure detector 52 Lead wire 53 Lid

Claims (5)

an inlet-side connection port for inflow of fluid;
an outlet-side connection port for discharging the fluid;
a valve body connected to the inlet-side connection port and the outlet-side connection port and capable of opening and closing a flow path between the inlet-side connection port and the outlet-side connection port;
a check valve portion provided downstream of the valve body, which is normally closed and opened when the pressure of the fluid from the valve body is equal to or higher than a predetermined pressure;
a valve chamber provided in a flow path between the valve body and the check valve;
a pressure detection unit capable of detecting pressure fluctuations inside the valve chamber,
A valve with a leak detection function, characterized by comprising: The check valve portion is
a valve seat provided in a flow path between the valve body and the outlet-side connection port;
a valve body capable of opening and closing the valve seat from the side of the outlet-side connection port;
a spring for urging the valve body toward the valve seat so as to close the valve seat in a normal state and open the valve seat when the pressure of the fluid from the valve body is equal to or higher than a predetermined pressure;
The valve with a leak detection function according to claim 1, characterized in that it has a A valve box having the inlet side connection port and the valve chamber and containing the check valve portion therein, the check valve portion having the outlet side connection port, and the pressure detection portion It has a pressure detector, a lead wire, and a lid, the pressure detector has a configuration capable of detecting pressure fluctuations inside the valve chamber, and the lead wire outputs a detection signal of the pressure detector to the outside. 3. The lid is attached to the outer surface of the valve body and accommodates the pressure sensor between the valve body and the lid. Valve with leak detection function. 4. A valve with a leak detection function according to any one of claims 1 to 3, wherein said valve body comprises a diaphragm type solenoid valve or a poppet type solenoid valve. A leak detection device attachable to a valve, comprising:
The valve is connected to an inlet-side connection port for inflowing a fluid, an outlet-side connection port for discharging the fluid, and the inlet-side connection port and the outlet-side connection port, and is connected to the inlet-side connection port and the outlet-side connection port. a valve body capable of opening and closing a flow path between the connection port,
a valve chamber connected to the outlet-side connection port;
a check valve portion connected to the valve chamber, closed in a normal state, and opened when the pressure of the fluid flowing in from the outlet side connection port is equal to or higher than a predetermined pressure;
a pressure detection unit capable of detecting pressure fluctuations inside the valve chamber,
A leakage detection device, characterized by comprising:

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