JP2839329B2 - Electromagnetic reversing valve device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for opening and closing a flow passage, and more particularly to an electromagnetic reversible valve device used for opening and closing a refrigeration circuit of a cooling and heating device.

[Prior Art] An example of a conventional electromagnetic reversible valve device will be described with reference to FIGS.

This device comprises a reversible valve 21 provided in a fluid circuit for reversing the flow of fluid, and a pilot valve 22 for controlling the opening and closing of the reversible valve. The reversible valve 21 has a valve body 25 in which a first outlet tube 23 and a second outlet tube 24 connected to a fluid circuit are fixed to the peripheral surface so as to face each other. , 27 are slidably fitted in the axial direction. A seat 29 for opening and closing the flow path between the openings of the tubes 23 and 24 in the valve body 25 is provided at an intermediate portion of the bracket 28 connecting the pistons 26 and 27. Piston 2
Micro holes 30, 31 penetrating in the axial direction are provided in 6, 27, respectively.

On the other hand, the pilot valve 22 is a three-way valve composed of an electromagnetic valve, and includes a valve body 32, a solenoid coil 33, and a fixed core 34.
A first valve body 37 connected to the movable iron core 36 and a second valve body 39 connected to the movable iron core 36 and biased by the spring 38.
Is provided.

The valve body 32 has a tube 40 connected to the low pressure side and a reversible valve.
A pair of tubes 4 respectively connected to both ends of the 21 valve body 25
1 and 42 are connected, and one of the other tubes 41 and 42 is selectively communicated with the tube 40 on the low pressure side.

Now, when the solenoid coil 33 is OFF, the springs 35 move the valve bodies 37 and 39 to the left in the drawing, and the tubes 40 and 41 communicate with each other, whereby the low pressure side of the piston 26 in the main body 25 of the reversible valve 21 is moved. When the inside of the valve body 25 is at a high pressure, the high-pressure fluid in the central chamber 44 between the two pistons 26 and 27 flows into the right-hand chamber 45 on the right-hand side of the piston 27 while communicating with the left-hand chamber 43 on the left.
The gas in 43 passes through the tube 41 and escapes to the tube 40 on the low pressure side, and the pistons 26 and 27 move to the left. As a result, the flow path between the access tubes 23 and 24 is closed by the sheet 29. 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 communicate with each other. As a result, the pistons 26 and 27 move to the right while the high pressure fluid in the right end chamber 45 passes through the tube 42 and escapes to the tube 40 on the low pressure side, and the flow path between the inlet and outlet tubes 23 and 24 is opened.

[Problems to be solved by the invention]

In the above-described conventional reversible valve device, a valve body and a pilot valve must be used, and a tube and the like for connecting the valve body and the pilot valve are required, and a low pressure that is always lower than the fluid pressure of the valve body serving as a 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 without a certain pressure difference.

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

[Means for solving the problem]

The above object is achieved by a first valve having a blind lid at one end and axially displaced openings in axially opposed inner walls of a cylindrical valve box having a solenoid tube and a fixed iron core at the other end.
And a pair of flat valve seats having a second fluid passage are provided in parallel with each other, and a space in the valve box is urged by a return spring between the fixed iron core and an axial line toward the space. A movable core that is movable in the direction, and a bracket that is connected to the inner end of the movable core, has a contact portion with the blind lid, and holds a combined valve body at an intermediate portion between the contact portion and the movable core. The combined valve body is provided with a cylindrical first valve body and a second valve body that are nested with each other, and seal portions on both end faces of the valve bodies are in close contact with the corresponding valve seats. An auxiliary spring provided so as to be urged to the valve body, and a seal member provided at a sliding fitting portion between the two valve bodies. A pressure transmission port communicating with the valve is provided, and the diameter of each seal of the valve and the distance between the valve The diameter of the engagement portion is substantially formed in the same diameter,
The combination valve element that slides between the two valve seats does not block the openings of both fluid passages when the solenoid coil is turned on, and the contact part of the bracket hits the blind lid when the solenoid coil is turned off. This is achieved by an electromagnetic reversible valve device positioned on the bracket to close the opening of one of the fluid passages by contact.

[Action]

In the reversible valve device of the present invention configured as described above, when the combination valve body is stopped on the opening of one of the fluid passages of the valve seat and the fluid flows in from the other flow passage, the combination valve body is closed. The flow of the fluid in the combined valve body is stopped by the sealing portions of the two valve bodies being in close contact with the opposing valve seats by the auxiliary springs inside the combined valve body and the sealing members of the fitting portions of the two valve bodies. At this time, the pressure in the fluid passage and the inside of the combined valve body communicating with the closed opening is equalized by the pressure transmission port of the valve body, and the same pressure is also applied to the other fluid passage and the inside of the valve box. And a pressure difference is generated outside, that is, in the space inside the valve box, but since the inside diameter of the cylinder outside the fitting portion is formed to be the same as the diameter of the seal portions at both ends of each valve body, the axial line of the combined valve body No force is generated in the direction (radial direction of the valve box) due to the above pressure difference. Therefore, the driving force for opening and closing the valve body is constant regardless of the increase or decrease of the pressure difference of the fluid or the direction of pressurization. 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 pulled by the solenoid coil, and does not need to rely on a pressure difference as in a conventional reversible valve device, and can make a pilot valve unnecessary.

〔Example〕

Hereinafter, embodiments of the electromagnetic reversible valve device of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the electromagnetic reversible valve device of the present invention, showing a state in which the flow path is fully closed, FIG. 2 is a cross-sectional view showing a combined valve body of the present invention, and FIG. FIG. 3 is a cross-sectional view illustrating a state in which the flow path of the device is fully opened.

In FIG. 1, reference numeral 1 denotes a cylindrical valve box which is deflected in the axial direction and has diametrically opposed first and second fluid passages 1a, 1b.
Are opened, and a pair of parallel flat valve seats are
2a and 2b are provided. One end of the valve box 1 has a fixed iron core 1
2, a lid 3b to which a circular tube 11 on which a solenoid coil 13 is disposed is fixed, and a blind lid 3a is fixed to the other end.

A movable core 7 urged by a return spring 8 provided between the movable core 7 and the fixed core 12 and movable in the axial direction toward the interior of the space inside the valve box 1. 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 for contacting the blind lid 3a is formed at the tip of the bracket 9,
The combined valve element 4 is loosely fitted between the contact portion 9a and the movable iron core 7.

The above-mentioned combination valve element 4 includes a cylindrical first valve element 4a and a second valve element 4b which are nested with each other, and a seal portion 4e formed by protruding the end faces of both valve elements in a ring shape. , 4f, and both seal portions 4e, 4f
Auxiliary spring 6 is built in so as to be urged closely to the corresponding valve seats 2a, 2b.

For example, an annular groove is formed in an outer peripheral wall of the first valve body 4a in a fitting portion between the two valve bodies 4a and 4b, and a sealing member 5 such as an O-ring is accommodated in this groove. Seal portions 4e, 4f of both valve bodies 4a, 4b
The pressure transmitting ports 4c and 4d communicating with the internal space of the combination valve body 4 are provided at the center of the valve body 4 and the diameter A of the seal portions 4e and 4f of the valve body and the fitting portion of the fitting portion between the two valve bodies 4a and 4b. The diameter B is formed substantially equal (FIG. 2).

The ON and O of the solenoid coil 13 are formed as described above.
Valve seat 2 depending on the axial direction of bracket 9 accompanying FF
When the solenoid coil 13 is turned on, the combination valve element 4 that slides between a and 2b moves the movable iron core 7 as shown in FIG.
And both fluid passages 1a, 1b attracted toward the fixed iron core 12.
Of the solenoid coil 13
Is turned off, the contact part 9a of the bracket 9 is
Is positioned with respect to the bracket 9 so as to close the opening of one of the fluid passages, for example, 1b (FIG. 1).

 Next, the operation of the device of the present invention will be described.

When the solenoid coil 13 is turned off, the movable iron core 7 separates from the fixed iron core 12 and is urged by the return spring 8 so that the abutting portion 9a of the bracket 9 hits the blind cover 3a, and the combined valve element is connected to the fluid passage 1b.
Stop upward and close the opening of the fluid passage 1b.

When the combination valve element is stopped on the second fluid passage 1b (FIG. 1), when fluid flows from the first fluid passage 1a into the space of the valve box 1, the pressure in the valve box 1 increases. but the average diameter d ₁ of the inner diameter d ₀ and a sealing portion at a position where the second valve body 4b of the combined valve body 4 is mated with the first valve body 4a are formed in the same (Figure 2) No axial force is generated in the valve elements 4a and 4b due to the fluid pressure. Therefore, the valve bodies 4a and 4b are respectively pressed against the opposed valve seats 2a and 2b only by the auxiliary spring 6,
Since the fluid is sealed by the seal portions 4e and 4f and the O-ring 5, the fluid flowing into the space of the valve box 1 does not flow out to the fluid passage 1b through the combined valve body 4. Similarly, when fluid flows in from the fluid passage 1b, similarly, the axial force of the combined valve body 4 does not occur due to the fluid pressure, so that the inflowing fluid may flow out of the device through the fluid passage 1a. Absent.

When the solenoid coil 13 is turned on, the movable iron core 7 is attracted by the fixed iron core 12 against the urging force of the return spring 8 and contacts the fixed iron core 12. As a result, the combination valve element 4 moves toward the solenoid coil 13 as shown in FIG. 3, the fluid passage 1b is opened, and the fluid passages 1a and 1b communicate with each other.

As a result, the 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 indicated by two arrows parallel to FIG.

〔The invention's effect〕

The electromagnetic reversible valve device of the present invention does not need to provide a low-pressure portion outside the main flow passage of the valve body, can be mounted at an arbitrary position in the fluid circuit, and can open and close the flow path with an arbitrary pressure difference. It does not require a pilot valve and piping to connect the pilot valve to the valve body, and can not only be compact, but also achieves the same operation in both forward and reverse directions. There are advantages such as not.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the electromagnetic reversible valve device of the present invention, showing a state in which the flow path is fully closed. FIG.
3 is a cross-sectional view of the electromagnetic reversible valve device of FIG. 1 when the flow path is fully opened, FIGS. 4 and 5 are diagrams showing a conventional electromagnetic reversible valve device, of which FIG. 4 is partially broken. FIG. 5 is a sectional view showing a main part of the pilot valve. 1 ... valve box, 1a, 1b ... fluid passage, 2a, 2b ... valve seat, 3a, 3b
... Lid, 4 ... Combined valve element, 4a, 4b ... Valve element, 4c, 4d ... Pressure transmission port, 4e, 4f ... Seal part, 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, 13… Solenoid coil.

Claims (1)

(57) [Claims] A first and a second axially-biased inner walls of a cylindrical valve box having a blind lid at one end and a solenoid tube and a fixed iron core at the other end and opposed to each other in the axial direction. A pair of flat valve seats having a second fluid passage are provided in parallel with each other, and the space in the valve box is urged by a return spring between the fixed iron core and the axial direction toward the space. And a bracket connected to the inner end of the movable core, having a contact portion with the blind lid, and holding a combined valve body at an intermediate portion between the contact portion and the movable core. The combined valve body has a cylindrical first valve body and a second valve body that are nested with each other, 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 so as to be urged, and an auxiliary spring provided at a sliding fitting portion of both valve bodies. A pressure transmitting port communicating with the hollow portion of the combined valve body is provided at the center of the seal portion of both valve bodies, and the diameter of each seal portion of the valve body and the distance between both valve bodies are provided. The combined valve body, which is formed to have substantially the same diameter as the fitting portion and slides between the two valve seats, does not block the openings of the two fluid passages when the solenoid coil is turned ON, and also connects the solenoid coil. An electromagnetic reversible valve device characterized in that, when turned off, the bracket is positioned such that the contact portion of the bracket abuts on the blind lid to close the opening of one of the fluid passages.