JPH09229214A - Four way selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a piston, so as to provide an inexpensive four way selector valve easy assembling, by forming seal grooves on the outer peripheral surface of the seal part of the piston and fitting resin seal rings to the grooves. SOLUTION: In a four way selector valve, a bowl-type valve slide 22 is provided in the center part, a piston 1 on which seal parts 31, 32 are provided is placed on the upper surface of a valve seat 21, and the valve slide 22 is laterally slid by being interlocked with the piston 1 in a state where it is in pressure contact with the upper surface of the valve seat 21. In the structure of the piston 1, seal parts 31, 32 provided with seal grooves on their outer peripheral parts are fixed and provided on both ends of a connecting plate 2 on which a hole in which the valve slide 22 is to be fitted is provided in the center part, and resin seal rings 33, 34 are fitted to the seal grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-way switching valve used for switching between heating and cooling of a heat pump type air conditioner, and more particularly to a four-way switching valve which is easy to assemble and is inexpensive by simplifying the structure of a piston. Is.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a conventional piston 1. The connecting plate 2 is a thin plate and has ribs 2a for reinforcement formed on both sides, a hole 2b into which the valve slide 22 is fitted, a hole 2c near both ends in the longitudinal direction, and a cut for guiding the shaft 3 at the tip. The notch 2d is provided. The shaft 3 is a round shaft having a diameter substantially equal to the width of the cutout portion 2d of the connecting plate 2, and one end thereof is provided with a slit 3a having a width substantially equal to the plate thickness of the connecting plate 2 in the vertical direction. Is provided with a through hole 3b, and the other end is provided with a small diameter portion 3c.
Then, the shaft 3 is inserted so as to be sandwiched by one end of the connecting plate 2, and is fixed by caulking with the rivet 5. The left seal portion 7 is provided by sandwiching a resin-made cup-shaped seal 7a and a leaf spring 7b for urging the seal 7a in the radial direction between an inner steel plate 7c and an outer steel plate 7d. ing. Then, the seal portion 7 is attached to the small diameter portion 3 of the shaft 3.
It is fixed by crimping to c. Further, a shaft 4 provided in the same manner as the shaft 3 is fixed to the other end of the connecting plate 2 with a rivet 6, and a right side seal including a seal 8a smaller than the left side seal portion 7, a leaf spring 8b and plates 8c, 8d. The portion 8 is fixed to the small diameter portion 4c of the shaft 4 by caulking.

[0003]

However, in such a conventional piston of a four-way switching valve, the number of parts constituting the piston 1 is large, and the assembly is complicated and the cost is high. Also, because the inside of the cylinder head is formed into a cup-shaped recess,
A turbulent flow is generated at that portion to increase the flow resistance of the refrigerant.

[Means for Solving the Problems]

The present invention has been made to solve the above-mentioned problems. A seal groove is formed on the outer peripheral surface of the seal portion of the piston 1, and a resin seal ring is fitted in the seal groove. Accordingly, the object is to provide a four-way switching valve that simplifies the structure of the piston and is easy to assemble and is inexpensive.

Another object of the present invention is to provide a four-way switching valve which can reduce the operating force of the piston by forming a serrated groove in the outer peripheral seal portion of the resin seal ring. .

That is, the four-way switching valve according to the present invention is a valve seat in which the piston 1 having the bowl-shaped valve slide 22 at the center and the seal portions 31 and 32 at both ends is disposed inside the tubular main body 10. 21 is a four-way switching valve that is installed on the upper surface of the valve seat 21 and slides left and right in conjunction with the piston 1 in the pressure contact state with the valve slide 22 on the upper surface of the valve seat 21. 22
The seal portion 3 is provided with seal grooves 31a and 32a on the outer peripheral portions at both ends of the connecting plate 2 provided with holes 2b for inserting
1, 32 are fixedly provided, and the seal grooves 31a, 32a are provided.
It is characterized in that resin seal rings 33 and 34 are fitted to the above.

A second aspect of the present invention is that the piston 1 has a seal portion 31 formed in a round shaft shape at both ends thereof.
The four-way switching valve according to claim 1, wherein the sealing portion 32 and the connecting plate 2 are integrated by resin molding or the like.

A third aspect of the present invention is a resin seal ring 3
3. The four-way switching valve according to claim 1 or 2, wherein serrated grooves 36 and 37 are formed in the outer peripheral seal portions of the parts 3 and 34.

[0009]

1 is a vertical sectional view of a four-way switching valve according to the present invention, showing a state in which it is arranged in a refrigerating circuit during cooling. The tubular main body 10 is a cylindrical pipe, and the tubular main body 10 is provided with three conduits 11, 12, 13 so as to communicate with each other in the axial direction, and 1 is provided on a surface facing the three conduits 11, 12, 13. The individual conduits 14 are provided so as to communicate with each other. Further, a guide port 20 and a guide port 26 are provided near both ends of the tubular body 10. And the tubular body 1
A dish-shaped lid 15 is fixed to the left side of 0, and a lid 16 having a sliding surface 16a of the right seal portion and a stopper portion 16b of the piston 1 formed by deep drawing is fixed to the right side. Conduit 1
1 communicates with the indoor heat exchanger 17, the conduit 13 communicates with the outdoor heat exchanger 18, the conduit 14 communicates with the discharge side of the compressor 19, and the conduit 12 communicates with the intake side of the compressor 19. The port 20 communicates with the conduit 12, and the guide port 26 communicates with the solenoid valve 25.

On the other hand, inside the tubular body 10, there are provided holes for communicating with the three conduits 11, 12, 13 respectively.
An inverted kamaboko type valve seat 2 in which a sliding surface 21a is formed on the upper surface and the lower surface is curved along the inner surface of the tubular body 10.
1 is provided. In addition, a bowl-shaped valve slide 22 is provided on the upper surface of the valve seat 21 so as to straddle at least two of the three conduits 11, 12, and 13. Built into. In addition, a leaf spring 24 is provided between the valve slide 22 and the connecting plate 2 so that the valve slide 22 does not rotate even if the piston 1 tries to rotate in the circumferential direction so as to come into close contact with the upper surface of the valve seat 21. Has become.

The pilot solenoid valve 25 is a three-way valve,
In the non-energized state, the conduit 12 communicates with the guide port 26, the piston 1 moves leftward together with the valve slide 22, and the refrigerant flows from the compressor 19 → the conduit 14 → the conduit 13 → the outdoor heat exchanger 18 → the expansion device 27 → The indoor side heat exchanger 17 circulates in the order of conduit 11 → conduit 12 → compressor 19. Also,
In the energized state, the conduit 14 communicates with the guide port 26, and the piston 1
Moves to the right with the valve slide 22, and the refrigerant
Compressor 19 → conduit 14 → conduit 11 → indoor heat exchanger 17 → expansion device 27 → outdoor heat exchanger 18 → conduit 13
Circulates from the conduit 12 to the compressor 19. The system and structure described above are exactly the same as the conventional products.

FIG. 2 shows a piston 1 of a four-way switching valve according to the present invention.
FIG. The piston 1 includes a connecting plate 2 having a hole 2b into which a valve slide 22 is fitted in the center,
A seal groove 31 is formed in the outer peripheral portion arranged on the left and right of the connecting plate 2.
The seal portion 31 and the seal portion 32 are provided with a and 32a, and these components are fixed by caulking. As another form of integration, as shown in FIG. 3, a hole 35a into which the valve slide 22 is fitted is inserted in the central portion.
Bending portions 35b and 35c are provided at both ends of the connecting plate 35 provided with, and projections 31b and 32 are formed on the inner wall surfaces of the sealing portions 31 and 32 in correspondence with the bending portions 35b and 35c.
By providing b, the bent portions 35b and 35c can be fixed by spot welding.

Further, the seal grooves 31a and 32a have
The resin seal rings 33 and 34 are fitted. In addition,
Since the original shapes of the resin seal rings 33, 34 are flat washers, a taper jig is used when the resin seal rings 33, 34 are fitted into the seal grooves 31a, 32a. That is, the resin seal rings 33 and 34 are formed in a conical ring shape by fitting the resin seal ring into the taper jig and expanding the inner diameter portion.

FIG. 5 and FIG. 6 are enlarged cross-sectional views of a main part showing another embodiment of the resin seal ring, which is in sliding contact with the sealing surface of the resin seal ring 33 (34), that is, the inner wall surface of the tubular body 10. A serrated groove 36 (37) is formed in the portion. In the four-way switching valve using the resin seal ring with the groove according to this embodiment, since the line contact is used instead of the surface contact, the sealing performance is improved and the sliding resistance of the piston that moves left and right is improved. It can be kept small. Therefore, as compared with the one without the groove, the seal groove 31 formed in the seal portions 31, 32 of the piston
The dimensional tolerance of a and 32a can be increased, and the parts can be easily processed.

Therefore, in the piston 1 constructed as described above, the seal grooves 31a and 32a are formed on the outer peripheral surfaces of the seal portions 31 and 32 at both ends, and the resin seal rings 33 and 34 are fitted into the grooves. Therefore, the structure of the piston is extremely simplified, and the assembly can be easily performed.

[0016]

[Other Embodiments] FIG. 4 is a vertical cross-sectional view showing another embodiment of the piston 1. In this piston 1, a seal portion 31 and a seal portion 32, which are formed in the shape of round shafts, are formed at both ends. The conventional connecting plate 2 is integrated by resin molding or die casting. By integrally molding in this way, not only caulking and welding processes are unnecessary, but also the number of parts can be further reduced.

[0017]

As described above, according to the present invention, the seal grooves 31a and 32a are formed on the outer peripheral surfaces of the seal portions 31 and 32 disposed on the left and right of the piston 1, and the resin seal ring 33 is formed in the grooves. , 34 are fitted,
Since the structure of the piston can be remarkably simplified as compared with the conventional product, it is possible to provide a four-way switching valve that is easy to assemble and inexpensive. Further, in the four-way switching valve using the resin seal ring with the groove, it is possible to improve the sealing property and suppress the sliding resistance of the piston moving left and right to a small value. Further, the seal portions 31, 32 formed in a round shaft shape.
In the case where the connection plate 2 and the connecting plate 2 are integrally formed,
Since 1 and 32 are formed in the shape of a round shaft, a practical effect that the flow resistance of the refrigerant can be reduced without causing a turbulent flow as compared with the conventional seal portion in which the inner side is formed in the cup-shaped recess Is great.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a four-way switching valve of the present invention showing a refrigeration circuit diagram during cooling.

FIG. 2 is a perspective view of a piston showing an embodiment of the present invention.

FIG. 3 is a perspective view showing another embodiment in which the seal portion and the connecting plate are fixed to each other.

FIG. 4 is a vertical sectional view of a piston showing another embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a main part showing another embodiment of the resin seal ring of the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment of the resin seal ring of the present invention.

FIG. 7 is a perspective view of a conventional piston.

[Explanation of symbols]

1 piston, 2, connecting plate, 2b
Valve slide fitting hole, 10 tubular body, 21
Valve seats, 22 valve slides, 3
DESCRIPTION OF SYMBOLS 1, 32 Seal part, 31a, 32a Seal groove, 33, 34 Resin seal ring, 35 Connecting plate, 36, 37 Serrated groove.

Claims (3)

[Claims] 1. A piston 1 having a bowl-shaped valve slide 22 at the center and seal portions 31, 32 at both ends,
A four-way switching valve that is installed on the upper surface of a valve seat 21 disposed inside the tubular body 10 and slides left and right in conjunction with the piston 1 while the valve slide 22 is pressed against the upper surface of the valve seat 21. The structure of No. 1 has a seal portion 31 having seal grooves 31a, 32a on the outer peripheral portions at both ends of a connecting plate 2 having a hole 2b for fitting the valve slide 22 in the central portion,
A four-way switching valve in which 32 is fixedly provided, and resin seal rings 33 and 34 are fitted in the seal grooves 31a and 32a. 2. The piston 1 is configured such that a seal portion 31 and a seal portion 32 each having a round shaft shape at both ends thereof are formed.
The four-way switching valve according to claim 1, wherein the connecting plate 2 and the connecting plate 2 are integrated by resin molding or the like. 3. The four-way switching valve according to claim 1, wherein serrated grooves 36 and 37 are formed in the outer peripheral seal portions of the resin seal rings 33 and 34.