JPH03292480A - Solenoid reversible valve system - Google Patents

Abstract

PURPOSE:To dispense with any pilot valve by opening or closing an opening, deflected in the axial direction of a valve box, with a combined valve element with a pressure transfer port slidden, moving the valve element with a movable core equipped with a return spring, and regulating it with a bracket. CONSTITUTION:Each of valve seats 2a, 2b, where fluid passages 1a, 1b deflected in the axial direction are opened, is installed in a cylindrical valve box 1. Each of pressure transfer ports 4c, 4d is installed in a combined valve element 4 with each of telescopically fitted, cylindrical first and second valve elements 4a, 4b and seal parts 4e, 4f, making them slide between the valve seats 2a and 2b. When a solenoid coil 13 is turned to ON, the combined valve element 4 is attracted together with a movable core 7, interconnecting an interval between openings, and when it is turned to OFF, this interval between the openings is closed by energization of a return spring 8 and positioning action of a bracket 9. Thus, such a reversible valve system as requiring no pilot valve is securable without using a pressure differential.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve for opening and closing a flow path, and particularly to an electromagnetic reversible valve device used for opening and closing a refrigeration circuit of an air-conditioning system.

[Conventional technology]

An example of a conventional electromagnetic reversible valve device will be described with reference to FIG. 4.5.

This device consists of a reversible valve 21 provided in a fluid circuit that makes the flow of fluid reversible, and a pilot valve 22 that controls opening and closing of the reversible valve. The above reversible valve 21 has a first inlet/outlet tube 23 and a second inlet/outlet tube 2 connected to a fluid circuit.
The valve body 2 is provided with a valve body 25 which is fixed to the circumferential surface of the valve body 4 in a facing manner.
Pistons 26 and 27 are fitted on both sides of the inside of the piston 5 so as to be slidable in the axial direction. A seat 2 for opening and closing the flow path between the openings of the tubes 23 and 24 in the valve body 25 is provided in the middle part of the bracket 28 that connects the pistons 26 and 27.
9 is provided. Each of the pistons 26, 27 is provided with a microhole 30, 31 passing through it in the axial direction.

On the other hand, the pilot valve 22 is a three-way valve made of a solenoid valve,
Valve body 32, solenoid coil 33, and fixed core 34
and a movable core 36 biased by a spring 35, a first valve body 37 connected to the movable core 36, and a second valve body 37 connected thereto and biased by a spring 38.
A valve body 39 is provided.

A tube 40 connected to the low pressure side and a pair of tubes 41 and 42 connected to both ends of the valve body 25 of the reversible valve 21 are connected to the valve body 32.
0 is selectively communicated with any other tube 41,42.

When the solenoid coil 33 is currently OFF, the spring 3
5, the valve bodies 37 and 39 move to the left in the figure, and the tubes 40 and 41 are communicated, so that the low pressure side is connected to the reversible valve 2.
10 communicates with the left end chamber 43 on the left side of the piston 26 in the valve body 25, and when the inside of the valve body 25 is under high pressure, both pistons 2
The high-pressure fluid in the center chamber 44 between 6.27 and 27 flows into the right end chamber 45 on the right side of the piston 27, while the gas in the left end chamber 43 passes through the tube 41 and escapes to the low pressure side tube 40, causing the piston 26.27 to move to the left. Moving. As a result, the ingress and egress tube 2
The flow path between 3 and 24 is closed by the sheet 29. Further, when the solenoid coil 33 is ON, the valve bodies 37 and 39 move to the right side in the figure, and the tubes 40 and 42 are communicated with each other. As a result, the high pressure fluid in the right end chamber 45 passes through the tube 42 and escapes to the low pressure side tube 40 while the piston 26.
27 moves to the right, and the flow path between the inlet and outlet tubes 23 and 24 is opened.

[Problem to be solved by the invention]

In the conventional reversible valve device described above, it is necessary to use a valve body and a pilot valve, and a tube, etc. is required to connect them, and a low pressure that is always lower than the fluid pressure of the valve body, which is the main flow path, is required. It is necessary to connect the low pressure side tube of the pilot valve to the side circuit, and it cannot operate unless there is a certain pressure difference.

An object of the present invention is to provide a reversible valve device that opens and closes a flow path using the traction force of a solenoid coil, does not depend on fluid pressure differences, and does not require pilot valves, low-pressure side tubes, etc. .

[Means to solve the problem]

The above object is to provide first and second openings offset from each other in the axial direction in mutually opposing axially inner walls of a cylindrical valve body having a blind lid at one end and a solenoid pipe and a fixed iron core at the other end. A pair of flat valve seats having a second fluid passage are provided in parallel with each other, and are provided in a space in the valve box in an axial direction toward the space by being biased by a return spring between the fixed core and the valve body. a movable iron core that is movable to the movable iron core; and a bracket that is connected to the inner end of the movable iron core, has a contact portion with the blind cover, and holds a combination valve body at an intermediate portion between the contact portion and the movable iron core. The above-mentioned combination valve body includes a cylindrical first valve body and a second valve body that are inserted into each other and pre-fitted, and the seal portions on the end faces of both valve bodies are in close contact with the corresponding valve seats. an auxiliary spring provided to be biased to A pressure transmission port is provided that communicates with the valve seat, and the diameter of each sealing part of the valve body and the diameter of the fitting part between the two valve bodies are formed to be approximately the same diameter, and the valve seat is slidable between the two valve seats. The combination valve body does not block the openings of both fluid passages when the solenoid coil is turned on, and when the solenoid coil is turned off, the abutment part of the bracket abuts against the blind cover, thereby blocking the opening of one fluid passage. This is achieved by an electromagnetic reversible valve device positioned on the bracket to occlude the

[For production]

In the reversible valve device of the present invention configured in this way, when the combination valve body is stopped above the opening of one of the fluid passages of the valve seat, when fluid flows in from the other fluid passage, both of the combination valve bodies The flow of fluid inside the combined valve body is stopped by the sealing portion of the valve body coming into close contact with the opposing valve seats by the auxiliary spring inside the combined valve body, and by the sealing member at the fitting portion of both valve bodies. At this time, the fluid passage leading to the closed opening and the inside of the combined valve body are at the same pressure due to the pressure transmission port of the valve body, and the other open fluid passage and the inside of the valve box are also at the same pressure, and the inside of the combined valve body is at the same pressure. A pressure difference occurs between the space and the outside, that is, the space inside the valve box, but since the inner diameter of the cylinder outside the fitting part is the same as the diameter of the seal parts at both ends of each valve body,
No force due to the above pressure difference is generated in the axial direction of the combined valve body (radial direction of the valve body). Therefore, the driving force for opening and closing the valve body remains constant regardless of the increase or decrease of the fluid pressure difference or the pressurizing direction.If the load of the auxiliary spring in the combined valve body is set appropriately, the combined valve body can be moved between the valve seats. It can be easily towed by a solenoid coil, does not need to depend on a pressure difference like conventional reversible valve devices, and can eliminate the need for a pilot valve.

〔Example〕

Embodiments of the electromagnetic reversible valve device of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the electromagnetic reversible valve device of the present invention, showing the flow path fully closed, FIG. 2 is a cross-sectional view of the combined valve body of the present invention, and FIG. 3 is the electromagnetic reversible valve of FIG. FIG. 3 is a cross-sectional view showing the flow path of the device when it is fully open.

In FIG. 1, reference numeral 1 denotes a cylindrical valve body having first and second fluid passages 1a, l which are offset in the axial direction and are diametrically opposed to each other.
b is open, and a pair of parallel flat valve seats 2a, 2b are provided on opposing inner walls. A lid 3b having a fixed iron core 12 and a circular tube 11 having a solenoid coil 13 disposed outside thereof is secured to one end of the valve box 1, and a blind lid 3a is secured to the other end.

In the space inside the valve box 1, there is a movable core 7 that is biased by a return spring 8 provided between the fixed core 12 and movable in the axial direction toward the space, and a movable core 7 that is movable in the axial direction into the space. A bracket 9 connected to the end by a spring pin 10 and also extending in the axial direction is provided, and a contact portion 9a that contacts the blind lid 3a is formed at the tip of the bracket 9. A combination valve body 4 is held in a loose fit between the movable iron core 7 and the movable iron core 7.

The above combination valve body 4 includes a cylindrical first valve body 4a and a second valve body 4b that are nested into each other, and a seal portion 4e formed by raising the end surfaces of both valve bodies into a ring shape. , 4f, and both seal portions 4 are provided in the internal space of the combination valve body 4.
An auxiliary spring 6 is built in so that valve seats 2a and 2b corresponding to e and 4f are urged closely.

For example, the first valve body 4 is connected to the positive fitting portion of both the valve bodies 4a, 4.
An annular groove is formed in the outer peripheral wall of a, and a sealing member 5 such as an O-ring is accommodated in this groove. Pressure transmission ports 4C and 4d communicating with the internal space of the combined valve body 4 are provided at the center of the seal portions 4e and 4f of both the valve bodies 4a and 4b, respectively, and the seal portions 4e and 4f of the valve bodies are provided respectively. diameter A and both valve bodies 4a and 4b
The diameter B of the fitting portion is formed to be approximately equal to the diameter B of the fitting portion (FIG. 2).

It should be noted that the solenoid coil 13 is turned ON by forming it as described above.
When the solenoid coil 13 is turned ON, the combination valve body 4, which slides between the valve seats 2a and 2b according to the axial direction of the bracket 9 when the valve is turned OFF, is fixed together with the movable core 7 as shown in FIG. Both fluid passages 1a are drawn towards the iron core 12.

1b, and when the solenoid coil 13 is turned off, the contact portion 9 of the bracket 9
A is positioned relative to the bracket 9 so as to close the opening of one fluid passage, for example lb (FIG. 1), by contacting the blind lid 3a.

Next, the operation of the apparatus of the present invention will be explained.

When the solenoid coil 13 is turned off, the movable iron core 7 separates from the fixed iron core 12, is biased by the return spring 8, and the contact portion 9a of the bracket 9 hits the blind cover 3a, and the combination valve body stops on the fluid passage lb. to close the opening of the fluid passage 1b.

When the combination valve body is stopped on the second fluid passage lb (Fig. 1), when fluid flows into the space of the valve body 1 from the first fluid passage 1a, the pressure inside the valve body 1 increases. However, since the inner diameter d0 of the part where the second valve element 4b of the combination valve element 4 fits with the first valve element 4a and the average diameter d1 of the sealing part are formed to be the same (Fig. 2), the valve element 4a and 4b, no force is generated in the axial direction of the valve body due to fluid pressure. Therefore, the valve body 4
a, 4b are valve seats facing each other only by the auxiliary spring 6) 2a
, 2b, and are made liquid-tight by the seal portions 4e, 4f and the O-ring 5, the fluid flowing into the space of the valve box 1 will not flow out through the combination valve body 4 into the fluid passage 1b. Conversely, when fluid flows in from the fluid passage 1b, no force is generated in the axial direction of the combination valve body 4 due to the fluid pressure, and therefore the fluid that flows in flows into the fluid passage 1a.
There is no leakage to the outside of the device.

Further, when the solenoid coil 13 is set to N, the movable iron core 7 is attracted to the fixed iron core 12 against the biasing force of the return spring 8 and comes into contact with the fixed iron core 12. As a result, the combination valve body 4 is
As shown in the figure, it moves toward the solenoid coil 13, the fluid passage 1b opens, and the fluid passages la and lb communicate with each other.

As a result, fluid can flow from the fluid passage 1a to the fluid passage 1b or from the fluid passage 1b to the fluid passage 1a.

These flow paths are shown in FIG. 3 by two parallel arrows.

〔Effect of the invention〕

The electromagnetic reversible valve device of the present invention does not need to provide a low-pressure part outside the main flow passage of the valve body, can be installed at any position in the fluid circuit, and can open and close the flow passage with any pressure difference. It does not require a pilot valve or piping to connect the pilot valve and the valve body, making it more compact, and the same operation can be obtained in either forward or reverse directions, so there is no need to consider the directionality when installing the flow path. It has advantages such as:

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the electromagnetic reversible valve device of the present invention, showing the flow path when the flow path is fully closed, and FIG. 2 is a sectional view of the combination valve body of the present invention.
Fig. 3 is a sectional view showing the flow path of the electromagnetic reversible valve device shown in Fig. 1 when it is fully open, and Figs. 4 and 5 are views showing conventional electromagnetic reversible valve devices, of which Fig. 4 is partially cut away. The sectional view shown in FIG. 5 is a diagram showing the main parts of the pilot valve. l...Valve box, la, lb...Fluid passage, 2a, 2b...Valve seat, 3a, 3b...Lid, 4...Combination valve body, 4a
・4b... Valve body, 4c, 4d... Pressure transmission port, 4
e, 4f... Seal portion, 5... Seal member, 6... Auxiliary spring, 7...
- Movable iron core, 8... Return spring, 9... Bracket, 9a... Contact part, 10... Spring pin, 11... Circular tube, 12... Fixed iron core, 1
3... Solenoid coil. Construction 1, valve box ifi, lb...fluid passage 2, . 2b...Valve ports 3a, 3b...Lid 4...Combination valve body 4a, 4b...Valve body 4(,,4(1...Pressure transmission port 4B, 4f..., Seal portion 5... Seal member 2 6・Auxiliary spring 7・・Movable iron core 8・・Return pipe・ 9・・Bracket 98 Contact part 10・・Spring bi/ 11・Circular tube 12・Fixed iron I・ 13・Lunoid coil

Claims (1)

[Scope of Claims] 1. Openings that are offset from each other in the axial direction are formed in the mutually opposing axially inner walls of a cylindrical valve box that has a blind lid at one end and a solenoid pipe and a fixed iron core at the other end. A pair of flat valve seats having first and second fluid passages are provided in parallel to each other in a space in the valve box, and are biased by a return spring between them and a fixed iron core toward the space. a movable iron core that is movable in the axial direction; and a bracket that is connected to the inner end of the movable iron core, has a contact portion for the blind cover, and holds a combination valve body at an intermediate portion between the contact portion and the movable iron core. The combination valve body includes a cylindrical first valve body and a second valve body that are fitted into each other in a nested manner, and valve seats whose seal portions on the end faces of both valve bodies correspond to each other. A combination valve is provided at the center of the sealing portion of both valve bodies. A pressure transmission port communicating with the hollow part of the body is provided, and the diameter of each sealing part of the valve body and the diameter of the fitting part between the two valve bodies are formed to be approximately the same diameter, and the diameter of the fitting part between the two valve bodies is approximately the same. The combination valve body that slides does not block the openings of both fluid passages when the solenoid coil is turned on.
The electromagnetic reversible valve device is also characterized in that the bracket is positioned so that when the solenoid coil is turned off, the abutting portion of the bracket abuts the blind cover to close the opening of one of the fluid passages.