JPH06281024A - Four-way selector valve - Google Patents

Abstract

PURPOSE:To secure the right and left concentricity by integrally forming the link plate of a piston and shafts. CONSTITUTION:A piston 1 in which a bowl type valve slide 22 is provided on the middle part and large and small seal parts 7 and 8 are provided on both ends is installed on the upper surface of a valve seat 21 arranged in the inside of a tubular main body 10. In a four-way selector in which the valve slide 22, in a condition where it is pressure-contacted with the upper surface of a valve seat 21, is sliding rightward and leftward interlocking the piston 1; the piston 1 is constituted in which the round-shaft small diameter parts 9a and 9b are provided on both the ends of a link rod provided with a hole to which the valve slide 22 is to be inserted, and large and small seal parts 7 and 8 are formed by calking fixing on the small-diameter parts 9a and 9b.

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.

[0002]

2. Description of the Related Art FIG. 5 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 fixed by the rivet 5. Large diameter side seal 7
Is a resin-made cup-shaped seal 7a and the seal 7a.
A plate spring 7b for urging the blades in the radial direction is sandwiched between an inner steel plate 7c and an outer steel plate 7d. The large-diameter side seal portion 7 is attached to the small-diameter portion 3 of the shaft 3.
It is fixed by crimping to c. 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 small-diameter side including a seal 8a smaller than the large-diameter side seal portion 7, a leaf spring 8b, and plates 8c and 8d. The seal portion 8 is caulked and fixed to the small diameter portion 4c of the shaft 4.

[0003]

However, in such a conventional piston of a four-way switching valve, the shafts 3 and 4 are complicated in shape and difficult to machine, and the piston 1 is assembled with a large number of parts. Was also complicated. Further, in order to secure the coaxiality of the left and right seal portions 7 and 8 of the piston 1, the flatness of the connecting plate 2, the inclination of the shafts 3 and 4,
Strict dimensional tolerances were required in the positions of the holes 2c into which the rivets 5 and 6 were inserted.

[Means for Solving the Problems]

The present invention has been made in order to solve the above-mentioned problems, and the connecting plate 2 of the piston 1 and the shafts 3 and 4 are integrally formed so that the right and left coaxiality can be easily secured. The purpose is to

That is, in the four-way switching valve according to the present invention, the piston 1 having the bowl-shaped valve slide 22 at the center and the large and small seals 7 and 8 at both ends is arranged inside the tubular body 10. Installed on the upper surface of the valve seat 21, and the valve slide 22 slides left and right in conjunction with the piston 1 in a pressure contact state with the upper surface of the valve seat 21. Connecting rod 9 provided with a hole 9c formed in
The small diameter portions 9a and 9b of the round shaft are provided at both ends of the
It is characterized in that large and small seal portions 7 and 8 are caulked and fixed to a and 9b. Further, the connecting rod 9 has a structure in which the center is formed in a plate shape and both ends of the connecting rod 9 having a hole 28c into which the valve slide 22 is fitted are formed in a cylindrical shape, and the cylindrical portion is formed along the axial direction. Pin fitting holes 28a and 28b are provided, and pins 29 and 30 of the round shaft having grooves 29a and 30a are caulked and fixed in the pin fitting holes 28a and 28b, and the seal portion 7 is provided at both ends of the pins 29 and 30 of the round shaft. , 8 is configured to be caulked and fixed.

[0006]

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 refrigeration 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. A guide port 20 and a guide port 26 are provided near both ends of the tubular body. A dish-shaped lid 15 is fixed to the left side of the tubular body 10, and a sliding surface 16a of the small diameter side seal portion 8 and the stopper portion 1 of the piston 1 are fixed to the right side by deep drawing.
The lid 16 forming 6b is fixed. The conduit 11 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 suction side of the compressor 19. The guide port 20 communicates with the conduit 12, and the guide port 26 is the solenoid valve 2.
It communicates with 5. On the other hand, inside the tubular body 10, holes that communicate with the three conduits 11, 12, and 13 are provided, a sliding surface 21a is formed on the upper surface, and a lower surface is formed on the lower surface of the tubular body 1.
An inverted kamaboko type valve seat 21 having a curved surface is provided along the inner surface of 0. Further, a bowl-shaped valve slide 2 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.
2 is provided and this valve slide 22 is incorporated in the piston 1. In addition, the valve slide 2
2 and the connecting plate 2, a leaf spring 24 is provided so that even if the piston 1 tries to rotate in the circumferential direction, the valve slide 22
Is in close contact with the upper surface of the valve seat 21 without rotating. The pilot solenoid valve 25 is a three-way valve, and in the non-energized state, the conduit 12 communicates with the guide port 26 and the piston 1
Moves to the left with the valve slide 22, and the refrigerant
Compressor 19 → conduit 14 → conduit 13 → outdoor heat exchanger 18 → expansion device 27 → indoor heat exchanger 17 → conduit 11
Circulates from the conduit 12 to the compressor 19. Further, in the energized state, the conduit 14 communicates with the guide port 26, the piston 1 moves rightward together with the valve slide 22, and the refrigerant is compressed 19 → conduit 14 → conduit 11 → indoor heat exchanger 17
→ Throttle device 27 → outdoor heat exchanger 18 → conduit 13 → conduit 12 → compressor 19 is circulated. 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. 3 is a perspective view showing the piston 1 in an elliptical plate shape in which small diameter portions 9a and 9b are provided at both ends of a round shaft, and the center is flattened to be thicker than the conventional connecting plate 2. And the hole 9 into which the valve slide 22 is fitted in this central portion.
At both ends of the connecting rod 9 provided with c, large and small seal portions 7,
8 is crimped and fixed. The large-diameter side seal portion 7 is
A cup-shaped seal 7a made of resin and a leaf spring 7b for urging the seal 7a in the radial direction are provided on the inner steel plate 7
It is provided by being sandwiched between c and the outer steel plate 7d. The large-diameter side seal portion 7 is caulked and fixed to the small-diameter portion 9a of the connecting rod 9. The small-diameter side seal portion 8 is smaller than the large-diameter side seal portion 7 and is composed of a seal 8a, a leaf spring 8b and plates 8c and 8d, and like the large-diameter side seal portion 7, is caulked and fixed to the small-diameter portion 9b of the connecting rod 9. is doing.

[0008]

In the four-way switching valve configured as described above,
The piston has a structure in which small-diameter portions 9a and 9b are provided at both ends of a round bar, and the center is crushed to form a plate-like shape and the valve slide 2
Since the large and small seal portions 7 and 8 are fixed to both ends of the connecting rod 9 provided with the hole 9c into which the 2 is fitted, it is easy to secure the coaxiality.

[0009]

[Other Embodiments] FIG. 3 is a longitudinal sectional view showing another embodiment of the piston 1, and FIG. 4 is an exploded perspective view of the piston 1 shown in FIG. The piston 1 shown in FIGS. 3 and 4 is
The structure of the connecting rod 9 is formed by squeezing the center of a cylindrical pipe into an elliptical plate shape, and along the axial direction along the cylindrical portion at both ends of the connecting rod 9 provided with holes 28c into which the valve slide 22 is fitted. Pin fitting holes 28a and 28b are provided. Further, the large-diameter side seal portion 7 is made of a resin and is cup-shaped, and a leaf spring 7b for urging the seal 7a in the radial direction is sandwiched between an inner steel plate 7c and an outer steel plate 7d. There is. Then, the large and small seal portions 7 and 8 are fitted into the cylindrical portions at both ends of the connecting rod 9, and the pin fitting holes 28 of the connecting rod 9 are inserted.
Round shaft pins 29 and 30 having grooves 29a and 30a are press-fitted into a and 28b, and the groove 29 provided in the pin 29 is provided.
The cylindrical portion corresponding to the position a is rolled from the outside and caulked to be fixed by 28d and 28e.

[0010]

As described above, according to the present invention, since the connecting plate 2 and the shafts 3 and 4 of the conventional piston 1 are integrally formed, the concentricity of the left and right seal portions 7 and 8 can be secured. ,
Further, since the plate shape of the connecting rod 9 is thicker than the plate thickness of the conventional connecting plate 2, the reinforcing rib 2a can be omitted. Further, the number of parts can be reduced and the assembling property can be improved, and its practical effect 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 vertical sectional view of a piston showing another embodiment of the present invention.

FIG. 4 is a perspective view of the piston shown in FIG.

FIG. 5 is a perspective view of a conventional piston.

[Explanation of symbols]

1 piston, 2 connecting plate, 2a rib, 2b
Valve slide fitting hole, 2c rivet fitting hole,
2d cutout part, 3, 4 shaft, 3a, 4a
Slit, 3b, 4b through hole, 3c, 4c small diameter part, 5, 6 rivet, 7 large diameter side sealing part, 8
Small diameter side seal part, 9, 28 connecting rod, 9a, 9b
Small diameter part, 9c, 28c Valve slide fitting hole, 2
8a, 28b pin fitting hole, 28d, 28e caulking, 29, 30 pin, 29a, 30a groove.

Claims (2)

[Claims] 1. A piston 1 in which a bowl-shaped valve slide 22 is provided in the central portion and large and small seal portions 7 and 8 are provided at both ends.
Is installed on the upper surface of the valve seat 21 arranged inside the tubular main body 10, and the valve slide 22 is attached to the valve seat 21.
In a four-way switching valve that slides to the left and right in conjunction with the piston 1 in pressure contact with the upper surface of the piston, the piston 1 has a plate-shaped center and a connecting rod having a hole 9c into which the valve slide 22 is fitted. The small diameter portions 9a and 9b of the round shaft are provided at both ends of the small diameter portion 9 and the small diameter portions 9a and 9b are provided.
A four-way switching valve characterized in that large and small seal portions 7 and 8 are caulked and fixed. 2. The structure of the connecting rod 9 is such that the center of the connecting rod 9 is formed in a plate shape, and both ends of the connecting rod 9 having a hole 28c into which the valve slide 22 is fitted are formed in a cylindrical shape, and the cylindrical portion has an axial direction. Pin fitting holes 28a, 28b are provided along the holes, and the round shaft pins 29, 30 having grooves 29a, 30a are caulked and fixed in the pin fitting holes 28a, 28b.
The four-way switching valve according to claim 1, wherein the seal portions (7, 8) can be caulked and fixed to both ends of (9, 30).