JP2000227171A - Two-way solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-way solenoid valve capable of inhibiting a reverse flow by the solenoid valve of a plunger type. SOLUTION: The valve port passages 71 and 71 of a pair of valve assemblies 19 and 19 having the solenoid valve structure of a plunger type are communicated with each other by main passages 8 and 9, only the exciting coil 10 of one valve assembly corresponding to the distribution direction of fluids is energized and, by cutting off its energization, an expansion valve function is caused to function as a check valve by the valve body 4 of the valve assembly of the non-energized side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way solenoid valve, and more particularly to a structure in which a fluid can be circulated in both directions in a solenoid valve having a spherical valve body at the tip of a plunger.

[0002]

2. Description of the Related Art For example, in an air conditioner, a solenoid valve is often used for switching a circuit of a refrigerant circuit, and a solenoid valve having a relatively large valve opening stroke is employed. That is, in this type of solenoid valve, the plunger is housed in the sleeve so as to be able to reciprocate freely, and the exciting coil is externally provided. When the exciting coil is energized, the attracting element is excited, the plunger is attracted, and the tip of the plunger is closed. While removing the spherical valve body from the valve seat, deenergizing the suction element by shutting off the power to the exciting coil, returning the plunger by the urging force of the coil spring, and seating the spherical valve body at the tip of the plunger on the valve seat. Thus, a valve action is performed.

The suction element is fitted to the rear end of the sleeve and fixedly sealed by means such as TIG welding, and a housing for covering the exciting coil is fixed to the upper end of the suction element by screws. . A valve seat base having a valve seat is fitted to the distal end side of the sleeve, and is fixedly sealed by means such as brazing, and a pipe constituting an inlet and an outlet of a refrigerant is attached to the valve seat base. I have. Concave portions are formed on the distal end surface of the suction element and the rear end surface of the plunger, respectively, and a coil spring is contracted between the concave portions to bias the plunger.

In the conventional solenoid valve configured as described above, when an excitation coil fixed to the outside of the sleeve is energized, the plunger is attracted against the spring force of the coil spring, and the spherical valve element is detached from the valve seat. When the flow passage is opened and the energization to the electromagnetic coil is cut off, the plunger is urged by the spring force of the coil spring, and the spherical valve element is seated on the valve seat to close the flow passage. .

[0005]

In this type of solenoid valve, when pressure is applied from the valve body side to the valve seat side when the valve body is seated on the valve seat, the valve body is more strongly pressed by the valve seat. So
The flow of the fluid can be prevented, but when pressure is applied from the valve seat side to the valve body side, the fluid flows from the valve seat side to the valve body at the point where the pressure acting on the valve body exceeds the spring force of the coil spring. It flows toward. In general, the spring force of the coil spring is small compared to the fluid pressure, so that the flow of the fluid from the valve seat side cannot be substantially prevented, so that the fluid inlet and outlet are uniquely determined in one direction. It has only a function as a valve.

[0006] For the above reasons, when the solenoid valve having the above structure is adjusted to flow rate by duty control by pulse drive to function as an expansion valve, it can be applied only to a refrigeration cycle in which the high pressure side and the low pressure side are determined. . Therefore,
In a two-way refrigeration cycle in which the flow direction of the refrigerant is reversed between cooling and heating, such as a cooling and heating device, the solenoid valve having the above structure cannot be used as an expansion valve, and a motor-driven expansion valve is generally used.

On the other hand, since a motor-driven solenoid valve is more expensive than a plunger-type solenoid valve, attempts have been made to construct a bidirectional expansion valve using a plunger-type solenoid valve. It is disclosed in Japanese Unexamined Patent Publication No. 58-106369.

However, in the expansion valve described in the above-mentioned conventional publication, it is necessary to provide a clearance between the shaft forming the valve body and the cylindrical portion having the orifice so as to allow the shaft to reciprocate. In practice, it is not possible to omit an electromagnetic valve that opens and closes a flow path and prevents backflow.

It is an object of the present invention to provide a plunger-type bidirectional solenoid valve which solves the above-mentioned drawbacks. There is substantially no leakage of refrigerant even if the solenoid valve is omitted. It is an object of the present invention to provide an electromagnetic valve which has both an electromagnetic valve for opening and closing a flow path of a refrigeration cycle and an expansion valve. Another object of the present invention is to eliminate the investment of new production means and the man-hours for development and design by using an existing standard plunger type solenoid valve.

[0010]

SUMMARY OF THE INVENTION Accordingly, a two-way solenoid valve according to the present invention comprises a pair of valve assemblies each having an excitation coil disposed on the outside thereof. A two-way solenoid valve that opens and closes a fluid flow passage and prevents fluid backflow at the other valve assembly, wherein the pair of valve assemblies are arranged in parallel with each other, and each is a sleeve. A valve seat is provided on one end side of the sleeve, and a plunger is housed in the sleeve so as to be reciprocally movable. When the energizing coil is energized, the plunger is attracted by the magnetic force of the attracting element, and the plunger is attracted. The valve body at the tip is separated from the valve seat or is seated on the valve seat, and when the excitation coil is not energized, the plunger is returned by the urging force of the coil spring, and the valve body is seated on the valve seat. Or from the valve seat On the other hand, the valve seat is formed with a valve port passage which is opened and closed by the valve element, and a portion between the valve element seating side of the valve port path of the pair of valve assemblies is a main body. An external passage is connected to a portion of the pair of valve assemblies, which is opposite to a valve seat of the valve port passage, and is connected to each other by a passage.

One of the features of the present invention is that a pair of valve assemblies are arranged in parallel, and the valve seat passage of the valve port passage is communicated with the main body passage. Accordingly, one of the valve assemblies exerts a function of blocking the flow of the fluid only in the forward direction of the fluid and the other in the reverse direction of the fluid, and thus has both functions of opening and closing the passage and preventing the backflow. Thus, a plunger-type bidirectional solenoid valve is obtained, which can be used both as a flow passage opening / closing solenoid valve and an expansion valve in a refrigeration cycle. In addition, since an existing standard plunger type solenoid valve can be used, investment in new production means and man-hours for development and design can be avoided.

The valve assembly may have a normally-closed structure in which the valve element is seated on the valve seat when not energized and is separated when energized, and the valve assembly is separated from the valve seat when not energized and seated when energized. The structure may be as follows.

In the above, the valve assemblies are arranged in parallel,
Although the valve port passages on the seat side of the valve seat are communicated with each other, the valve assemblies may be arranged in series to communicate the valve port passages on the opposite side of the seat.

That is, the two-way solenoid valve according to the present invention comprises a pair of valve assemblies each having an excitation coil disposed on the outside, and one of the valve assemblies corresponding to the flow direction of the fluid allows the fluid passage to flow. A two-way solenoid valve that opens and closes and prevents reverse flow of fluid at the other valve assembly, wherein the pair of valve assemblies are arranged in series with each other, each including a sleeve, and A valve seat is provided at one end side, and a plunger is housed in the sleeve so as to be reciprocally movable. When the energizing coil is energized, the plunger is attracted by the magnetic force of the attracting element, and the valve body at the tip of the plunger is a valve. The plunger is moved back by the biasing force of the coil spring when the excitation coil is de-energized or is separated from the seat or is seated on the valve seat, and the valve body is seated on or separated from the valve seat. To be On the other hand, a valve port passage opened and closed by the valve element is formed in the valve seat, and a body between a portion of the pair of valve assemblies opposite to the valve element seating side of the valve port path is a main body. The pair of valve assemblies are connected to each other by a passage, and the pair of valve assemblies are connected to the valve seat passages of the valve port passages such that external passages communicate with each other.

The main body passage may be constituted by a pipe or the like,
For example, a pair of valve assemblies may be connected at the base of the valve seat to form a body passage at the base of the valve seat. That is, the pair of valve assemblies may be interconnected by one valve seat base, the valve seats of the pair of valve assemblies may be respectively formed in the valve seat base, and the main body passage may be formed in the valve seat base. .

Further, the two-way solenoid valve according to the present invention can function as an expansion valve by adjusting the flow rate by duty control by pulse driving. That is, of the pair, only the excitation coil of one or the other valve assembly corresponding to the fluid flowing in the forward or reverse direction is energized and cut off, and the valve element of the one or the other valve assembly is separated. The seat can be seated to adjust the flow rate of the fluid.

[0017]

According to the present invention, the valve port passages of the pair of valve assemblies having the structure of the one-way solenoid valve are connected to each other by the main body passage, so that the existing standard one-way valve is used. A bidirectional solenoid valve can be manufactured without making significant changes in the design technology and manufacturing equipment of the solenoid valve, and therefore an inexpensive bidirectional solenoid valve can be provided.

Focusing on the fact that each of a pair of valve assemblies having a structure of a one-way solenoid valve has a function of blocking flow only in one direction of fluid, the valve on the side corresponding to the flow direction is noted. Since only the exciting coil of the assembly is energized / cut off, the driving power can be made the same as that of the conventional one-way solenoid valve, and the non-energized valve assembly functions as a normal check valve. Therefore, a check valve conventionally provided in this type of refrigerant circuit can be omitted, which is economical.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples shown in the drawings. FIGS. 1 to 4 show a structural example of a preferred embodiment of a two-way solenoid valve according to the present invention.
Is a diagram showing an example of a system configuration in which a bidirectional solenoid valve according to the present invention is applied to a refrigeration cycle of an air conditioner, and FIG. 6 is a diagram showing an example of a system configuration of a refrigeration cycle of a conventional air conditioner.

First, in order to facilitate understanding of the present invention, a system configuration of a conventional refrigeration cycle of an air conditioner including such a solenoid valve will be described. In FIG. 6, in the refrigeration cycle system, a pump 200, an accumulator 300, and a four-way valve 400 form one refrigerant flow path,
Four-way valve 400, indoor heat exchanger 500, outdoor heat exchanger 6
The other refrigerant flow path is constituted by the solenoid valves 700a and 700b for opening and closing the flow path and the bidirectional expansion valve 800.

In the case of the heating operation, the four-way valve 400 is set as shown by a solid line, and the flow direction of the refrigerant is indicated by a solid arrow B
It becomes the direction shown. When the solenoid valve 700a is energized to separate the valve body, the compressed refrigerant is released from the indoor heat exchanger 50.
0 and dissipates heat, the expansion valve 800, the solenoid valves 700a, 7
00b, return to the pump 200 via the outdoor heat exchanger 600 and the four-way valve 400. Since the solenoid valve 700b does not have a blocking function in the direction of the solid arrow B, the refrigerant passes without electricity.

In the case of the cooling operation, the four-way valve 400 is set as shown by the broken line, and the refrigerant flows in the direction shown by the broken line arrow C. Contrary to the heating operation, the refrigerant is supplied to the outdoor heat exchanger. 600, solenoid valve 700 opened when energized
(b) After passing through the electromagnetic valve 700a and the expansion valve 800 and entering the indoor exchanger 500 to absorb heat, the flow returns to the pump 200 via the four-way valve 400. In the case of cooling, the refrigerant passes while the solenoid valve 700a is not energized.

As described above, the expansion valve 800 has the function of adjusting the flow rate of the refrigerant, and the solenoid valves 700a and 700b have the functions of opening and closing the flow path and preventing the backflow, and individual devices are used. The two-way solenoid valve according to the present invention has the above two functions,
That is, the function of adjusting the flow rate and the functions of opening and closing the flow path and preventing backflow are combined.

1 to 4 show a preferred embodiment of a two-way solenoid valve according to the present invention. In the figure, a two-way solenoid valve 100 is constituted by a pair of valve assemblies (hereinafter, referred to as valve ASSY) 19, 19 having substantially the same structure.
The two valves ASSY 19, 19 surround the housing 11,
Excitation coils 10a and 10b covered by 11 are arranged, and the housings 11 and 11 are fixed to the suction elements 2 and 2 of the valves ASSY 19 and 19 by screws 12 and 12, respectively.

In the valve ASSY 19, a sleeve 1 having a cylindrical shape is used.
The suction element 2 is inserted into an upper half portion of the suction element 2 and fixed by means such as TIG welding, and a concave portion is formed on a distal end surface of the suction element 2. A plunger 3 is reciprocally inserted into the lower half of the sleeve 1, and a recess is formed on the rear end surface of the plunger 3 so as to face the recess of the suction element 2, and between the suction element 2 and the plunger 3. A coil spring (spring member) 5 is housed in the recess, and a spherical valve body 4 is rotatably attached to the tip of the plunger 3.

A cylindrical portion of a valve seat base 6 is fitted to the lower end of the sleeve 1 and fixed by brazing or the like, and a valve is provided on the bottom of the valve seat base 6 in cooperation with the spherical valve element 4. A valve seat 7 constituting a mechanism is formed, and a refrigerant inflow / outflow port is formed in a cylindrical portion of the valve seat base 6, and a refrigerant inflow / outflow pipe 8 is fixed by means such as brazing. 6, a valve port passage 71 is formed below the valve seat 7, and a refrigerant inflow / outflow pipe 9 is fixed by means such as brazing.

In the two-way solenoid valve 100 configured as described above, if it is necessary to distinguish the components of the pair of valves ASSY 19, 19, the description will be given with reference numerals a and b added.

FIG. 1 shows a first embodiment of a two-way solenoid valve according to the present invention. In this example, the valves ASSY 19, 19 are arranged in parallel with each other and fixed by a bracket 20,
A valve connected to a common refrigerant inflow / outflow pipe (main body passage) 8 between the refrigerant inflow / outflow ports provided in the cylindrical portions of the valve seat bases 6, 6 of the two valves ASSY 19, 19 and connected to the valve seats 7, 7 Refrigerant inflow / outflow pipes (external passages) 9a, 9b are fixed to the mouth passages 71, 71 by means such as brazing, thereby forming a two-way solenoid valve having a check function.

When the refrigerant flows from the refrigerant inflow / outflow pipe 9a to the refrigerant inflow / outflow pipe 9b, that is, in the direction of arrow D, the valve element 4b has no check function, and the valve element 4a has the check function. The flow path is opened by energizing the coil 10b to separate the valve body 4b. The refrigerant flows in the opposite direction, that is, the refrigerant inflow / outflow pipe 9 as shown in the direction of arrow E.
In order to flow the refrigerant from b to the refrigerant inflow / outflow pipe 9a, the excitation coil 10a may be energized. Non-energized valve body 4a
Or, 4b is pushed up against the spring force of the coil spring 5 by the fluid pressure due to the flow of the refrigerant in the flow direction D or E to allow the flow of the refrigerant, but the spring of the coil spring 5 against the reverse flow of the refrigerant. Since it is pressed against the valve seat 7 by the force and the fluid pressure at the time of the backflow to prevent the backflow of the refrigerant, there is no need to separately arrange a check valve.

FIG. 2 shows a second embodiment of the two-way solenoid valve according to the present invention. In this example, two valves ASSY19, 19
Are interconnected by one valve seat base 6, whereby the bracket 20 in the first embodiment is omitted,
A main body passage 61 is formed in the middle of the valve seat base 6, and both ends of the main body passage 61 are communicated with the cylindrical portions on both sides of the valve seat base 6, whereby the common refrigerant inflow and outflow in the first embodiment is achieved. The pipe 8 is omitted.

FIG. 3 shows a third embodiment of the two-way solenoid valve according to the present invention. In this example, two valves ASSY19, 19
Are arranged in series and fixed by the bracket 20,
At the bottom of the valve seat bases 6 and 6 of the two valves ASSY 19 and 19, valve port passages 71 and 71 are formed to extend below the valve seat 7, and both valve port passages 71 and 71 share a common refrigerant inflow / outflow pipe. (Main body passage) 9 while the valve seat bases 6 and 6 are connected.
Refrigerant inflow / outflow pipes (external passages) 8a and 8b are respectively fixed to the refrigerant inflow / outflow ports of the cylindrical portion by brazing or the like.

When the refrigerant flows from the refrigerant inflow / outflow pipe 8a to the refrigerant inflow / outflow pipe 8b, that is, in the direction of arrow D, the valve 4b has a check function and the valve 4a does not have the check function. The flow path is opened by energizing 10a to separate the valve body 4a. Conversely, when the refrigerant flows from the refrigerant inflow / outflow pipe 8b to the refrigerant inflow / outflow pipe 8a as shown in the direction of arrow E, the excitation coil 10b may be energized.

FIG. 4 shows a fourth embodiment of the two-way solenoid valve according to the present invention. In this example, two valves ASSY19, 19
Are interconnected by one valve seat base 6, whereby the bracket 20 in the third embodiment is omitted,
A body passage 71 communicating the valve seats 7 with the valve seat base 6.
The common refrigerant inflow / outflow pipe 9 in the third embodiment is omitted.

FIG. 5 is a system diagram showing an embodiment in which the bidirectional solenoid valve according to the present invention is applied to a refrigeration system of an air conditioner. In the drawing, in the present system, one refrigerant circulation path is constituted by a pump 200, an accumulator 300, and a four-way valve 400, and another one is constituted by a four-way valve 400, an indoor heat exchanger 500, an outdoor heat exchanger 600, and a two-way solenoid valve 100. One refrigerant flow path is configured.

When the bidirectional solenoid valve 100 is operated as a bidirectional expansion valve by means such as duty control using a pulse voltage, as understood from the above description, the valve element 4a or 4b to which no voltage is applied reversely flows. Since it has a blocking function, it is not necessary to separately provide an electromagnetic valve, and a very simple system can be constructed.

In the above-described example, the normally closed solenoid valve structure in which the valve element is seated on the valve seat when not energized and separated when energized is described. However, the valve element is separated from the valve seat when not energized and energized. A similar bidirectional solenoid valve can also be configured with a normally-open solenoid valve structure that is sometimes seated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of a two-way solenoid valve according to the present invention.

FIG. 2 is a cross-sectional view illustrating a second embodiment.

FIG. 3 is a sectional view showing a third embodiment.

FIG. 4 is a cross-sectional view showing a fourth embodiment.

FIG. 5 is a system configuration diagram showing an example in which the two-way solenoid valve according to the present invention is applied to a refrigeration cycle of an air conditioner.

FIG. 6 is a system configuration diagram showing a conventional air conditioner refrigeration cycle.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 sleeve 2 suction element 3 plunger 4 spherical valve element 5 coil spring (spring member) 6 valve seat base 7 valve seat 8, 8a, 8b inflow / outflow pipe (main body passage, external passage) 9, 9a, 9b inflow / outflow pipe (main body) Passage, external passage) 10, 10a, 10b Excitation coil 61 Main passage 71 Valve passage (main passage)

Claims (4)

[Claims] The present invention comprises a pair of valve assemblies each having an excitation coil disposed on the outside thereof, and one of the valve assemblies corresponding to a flow direction of the fluid opens and closes a fluid passage, and the other valve assembly uses the other valve assembly. A two-way solenoid valve adapted to prevent backflow of fluid, wherein the pair of valve assemblies are arranged in parallel with each other, each includes a sleeve, and a valve seat is provided at one end of the sleeve, A plunger is reciprocally accommodated in the sleeve, and when the energizing coil is energized, the plunger is attracted by the magnetic force of the attraction element, and the valve body at the tip of the plunger is separated from the valve seat, or the plunger is moved to the valve seat. While the plunger is moved back by the biasing force of the coil spring when the excitation coil is de-energized, and the valve element is seated on or separated from the valve seat, Above valve seat A valve port passage opened and closed by the valve element is formed, and a portion between the valve element passages of the pair of valve assemblies and the valve element seating side is communicated with each other by a main body path, and the valve port of the pair of valve assemblies is provided. An external passage is connected to a portion of the passage opposite to the valve body seating side, and an external passage is connected to the passage. 2. A valve assembly comprising a pair of valve assemblies each having an excitation coil disposed on the outside thereof, wherein one of the valve assemblies corresponding to the direction of fluid flow opens and closes a fluid passage, and the other valve assembly uses the other valve assembly. A two-way solenoid valve adapted to prevent backflow of fluid, wherein the pair of valve assemblies are arranged in series with each other, each includes a sleeve, and a valve seat is provided at one end of the sleeve, A plunger is housed in the sleeve so as to be reciprocally movable, and when the excitation coil is energized, the plunger is attracted by the magnetic attraction force of the attracting element, and the valve body at the tip of the plunger is separated from the valve seat or the valve seat. While the plunger is returned by the urging force of the coil spring when the excitation coil is de-energized and the plunger is seated on or separated from the valve seat, Above valve seat A valve port passage opened and closed by the valve body is formed, and a portion of the pair of valve assemblies that is opposite to the valve body seating side of the valve port passage is communicated with each other by a main body passage. A bidirectional solenoid valve, wherein an external passage is connected to each of the valve port passages of the assembly on the valve body seating side. 3. The pair of valve assemblies are interconnected by a single valve seat base, the valve seats of the pair of valve assemblies are respectively formed on the valve seat bases, and the main body is formed on the valve seat bases. 3. The bidirectional solenoid valve according to claim 1, wherein a passage is formed. 4. The valve of the one or other valve assembly of the above-mentioned one or the other valve assembly, in which only the excitation coil of one or the other valve assembly corresponding to the fluid flowing in the forward or reverse direction is energized and cut off. The two-way solenoid valve according to any one of claims 1 to 3, wherein the body is separated and seated to adjust the flow rate of the fluid.