JPS61109974A - Manufacture of four-way reversing valve - Google Patents

Abstract

PURPOSE:To prevent a brazing material from creeping onto the valve seat surface by forming a brazing material stopper space in the wall surface on both circumferential sides of the valve seat with the inner circumferential surface of a reversing valve body and a retainer jig. CONSTITUTION:A wall surface 11e for forming a brazing material stopper space (r) between the inner circumferential surface of a reversing valve body 1 is formed on both circumferential sides of a valve seat 11. An intake pipe 6 and conduits 7, 8 are inserted from a through-hole in the reversing valve body 1 through through-holes 11a, 11b, 11c as the valve seat 11 is held in a predetermined position in the reversing valve body 1 by a retainer jig T. When silver brazing material S is melted by a burner V on the outer perimeter of the intake pipe 6 and conduits 7, 8, part of silver brazing material stays in the brazing material stopper space (r), and never reaches the flat surface 11d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Application The present invention relates to a method of manufacturing a four-way reversing valve for a reversible refrigeration cycle, which is used particularly for switching between heating and cooling in a heat pump type air conditioner.

Conventional technology The cylindrical reversing valve body of a four-way reversing valve has two heat exchangers on both sides of the suction pipe connected to the suction side of the compressor that function reversibly as a condenser or evaporator. A valve seat is provided within the reversing valve body having a connection port for the suction pipe and the conduit, and a slide valve is moved onto the series of smooth surfaces, and the suction pipe is connected by the slide valve. Switching between cooling and heating is accomplished by alternatively communicating the ports with two connections to the conduits of the heat exchanger.

Problems to be Solved By the way, in the prior art, when brazing a separate valve seat Y to the reversing valve main body X together with the suction pipe Z, as shown in FIG. There was a disadvantage that there was a time when the sheet flowed onto the smooth surface and became unusable, resulting in poor yield.

The present invention has focused on the above-mentioned points and has been improved so that the flowing brazing material does not move to the surface of the valve seat.

[Structure of the invention]

Means for Solving the Problems In order to achieve the above object, in the present invention, three holes are formed in the reversing valve body for the suction pipe of the compressor and the conduit for the heat exchanger, and a valve seat for the slide valve is formed. Three through holes corresponding to the three through holes are formed in the valve seat, and the valve seat is held in a predetermined position within the reversing valve body by a holding jig, and the wall surfaces at both ends of the valve seat in the circumferential direction are formed. forming a wax reservoir space defined by the inner circumferential surface of the reversing valve body and the holding jig at the section, inserting the suction pipe and the conduit from the through hole of the reversing valve body into the through hole of the valve seat; A configuration was adopted in which molten wax flows into the gap between the suction pipe and the conduit and the peripheral edge of each through hole.

Example Embodiments will be described below based on the drawings.

FIG. 1 shows a cross-sectional view of this embodiment. Reference numeral 1 denotes a metal reversing valve body, which consists of a large-diameter cylinder portion 1a and a small-diameter cylinder portion 1b, with plugs 2.3 on both end faces. Fitted and welded. A discharge pipe 5 connected to the discharge side of the compressor 4 and a suction pipe 6 connected to the suction side of the compressor 4 are connected to the circumferential surface of the small diameter cylinder portion 1b of the reversing valve body 1, and a suction pipe 6 is connected to the suction side of the compressor 4. Conduits 7 and 8 are connected to both sides thereof. The conduits 7, 8 are heat exchangers 9.1 which function reversibly as condensers or evaporators.
Concatenated to 0. Inside the reversing valve body 1, a valve seat 11 having a series of smooth surfaces 11d is welded to the suction pipe 6 and the conduits 7 and 8 on both sides. The valve seat 11 has through holes 11a, llb, l communicating with the suction pipe 6 and the conduits 7, 8.
It has lc.

A communication lumen 12 is formed on the smooth surface lid of the valve seat 11.
．． 3 is slidably provided.

The large diameter cylinder portion 1a and the small diameter cylinder portion 1b are provided with large and small pistons 13, 14 and are connected by a connecting rod 15, and are also connected to the slide valve 12. The large piston 13 forms a large pressure receiving part A, and the small piston 14 forms a small pressure receiving part B.

The slide valve 12 communicates the suction pipe 6 with the conduit 7 in the first position shown in FIG. piston 1
3.14 to slide valve 12 are switched and moved by the operating mechanism described below.

A plug body 2 fixed to the end face of the large diameter cylinder portion 1a of the reversing valve body 1 is provided with a connecting pipe portion 2' projecting outward.
A plunger pipe 21 of the operating solenoid valve 2o is fixed. The electromagnetic valve 2o is a well-known two-way valve, and is composed of a plunger 22, a fixed iron core 23, a return spring 24, and an electromagnetic coil 25. A ball valve 26 as a high-pressure side valve body is fixed to the tip of the plunger 22.

A high-pressure side valve seat 2a protruding toward the plunger is provided at a position facing the ball valve 26 in the plug body 2, facing the pilot valve chamber R1 on the outside of the plug body, and facing the large diameter cylinder portion 1a on the inside of the plug body 2. An operation room R2 is formed.

The plug body 2 is provided with a through hole 2b extending in the axial direction from the valve seat seat 1-22, and a side hole 2c that branches from the through hole 2b and communicates with the operation chamber R2. A suction hole 2d that communicates with a low pressure bleed pipe 6a connected to the body 2.
is formed. In the operation chamber R2, a flat plate valve 27 for opening and closing the low-pressure side valve seat 2e provided at the end of the suction hole 2d is provided at the free end of a leaf spring 28, and the leaf spring 28 always holds the valve in the valve-closing direction. Forced. A drive rod 29 is loosely fitted into the through hole 2b, and when the ball valve 26 closes the high pressure side valve seat 2a, the drive rod 29 pushed by the ball valve 26 is pressed against the leaf spring 2.
8 by suppressing the middle part of the flat valve 27 to the low pressure side valve seat 1-
2e, and the suction hole 2d is opened. A high pressure bleed pipe 5a branching from the discharge pipe 5 is connected to the pilot valve chamber R1. The other plug body 3 is connected to a low pressure bleed pipe 6b.

FIG. 1 shows the state when the electromagnetic coil 25 is de-energized, the plunger 22 is biased in the valve closing direction by the action of the return spring 24, the ball valve 26 closes the high pressure side valve seat 2a, and the drive rod is closed. The flat valve 27 is separated from the low-pressure side valve seat 2B via a valve 29 (see FIG. 2).

In this state, when the compressor 4 is operating, low pressure is acting on the outside of the large and small pressure receiving parts A and B, so the difference in pressure receiving area with respect to the high pressure acting on the inside of the pressure receiving parts A and B is 1. The piston 13, 14 to the slide valve 12 are moving in the direction of the plug body 2 facing the large pressure receiving part A, and the slide valve 12 communicates the suction pipe 6 and the conduit 7, and the refrigerant gas is transferred from the compressor 4 to the discharge pipe. Tube 5 - Conduit 7 - Heat exchanger 9
- Heat exchanger 10 - Conduit 8 - Suction pipe 6 - Compressor 4 cycle circuit.

Next, when the current coil 25 is energized, the plunger 22 is attracted by the fixed iron core 23, and as the ball valve 26 moves away from the high pressure side valve seat 2a, the flat valve 27 moves away from the low pressure side valve seat 2a.
e is closed, the pressure on the outside of the large pressure receiving part A is converted from low pressure to high pressure, and therefore the piston 13, 14 to the slide valve 12 move in the direction of the plug body 3 where the small pressure receiving part B faces, and the slide valve 12 moves toward the suction pipe. 6 and conduit 8 are communicated, and the refrigerant gas forms a cycle circuit of compressor 4 - discharge pipe 5 - conduit 8 - heat exchanger 10 - heat exchanger 9 - conduit 7 - suction pipe 6 - compressor 4.

Regarding the fixing of the valve seat 11, suction pipe 6, and conduits 8, 9 to the reversing valve body 1, as shown in FIG. A wall surface portion 11e for forming a wax reservoir space r is formed between the valve seat 1 and the valve seat 1 by a holding jig T.
1 is held at a predetermined position in the reversing valve body 1, connect the suction pipe 6 and the conduits 7, 8 from the through holes a, b, c of the reversing valve body 1 to the through holes 11a, llb, llc of the valve seat 11. The suction pipe 6 and the conduit 7 are inserted and supported in an upright state by the stepped portion 11f.
.

11b, llc, and the suction pipe 6 and the conduit 7.8 are joined to the reversing valve main body 1 and the valve seat 11, and the reversing valve main body 1 and the valve seat 11 are joined. At this time, a part of the melted silver solder S flows into the gap between the reversing valve body 1 and the valve seat 11 and descends, but it stays in the wax reservoir space r and does not reach the smooth surface lid (the fifth figure).

In the embodiment shown in FIG. 6, plugs 31 and 32 are fitted and welded to both end surfaces of a metal reversing valve body 30, and a discharge pipe 5 connected to the discharge side of the compressor is provided on one side of the circumferential surface. On the other side of the circumferential surface, a suction pipe 6 is connected to the suction side of the compressor, and heat exchanger conduits 7 and 8 are connected on both sides thereof.

Inside the reversing valve main body 30, a suction pipe 6 and conduits 7 on both sides,
8, a valve seat 33 having a series of smooth surfaces 33d is welded in the same manner as described above.

The valve seat 33 has a through hole 3 communicating with the suction pipe 6 and the conduits 7 and 8.
3a, 33b, and 33c. A slide valve 34 having a communication bore 34a is slidably provided on the smooth surface 33d of the valve seat 33.

Pistons 35 and 36 having the same diameter are provided within the reversing valve body 30 and are connected by a connecting rod 37, and also connected to the slide valve 34. The slide valve 34 is connected to the suction pipe 6
are selectively communicated with the conduits 7 and 8.

A valve chamber 31a is formed within the outward protrusion of the plug body 31, a high pressure bleed pipe 5a is connected to one side of the valve chamber 31a, and through holes 38a, 38b, and 38c are connected to the other side of the valve chamber 31a. A low pressure bleed pipe 6a is connected to the central through hole 38a, and through holes 38b, 38 on both sides thereof are connected to the central through hole 38a.
Connected to c is a communication pipe 39.40 that communicates with chambers R1 and R4 outside the piston 35.36. 41 is a slide valve having a communication lumen 41a, and a solenoid valve 4 for operation.
The plunger 43 is slidably supported in the chamber of the plunger 2, and is pressed against the valve seat 38 by a spring 44.

In the above configuration, in the state shown in FIG. 6, the plunger 43 is pushed out by the spring 45, the slide valve 41 connects the low pressure bleed pipe 6a with the communication pipe 39, and high pressure is flowing through the communication pipe 40. The pressure in the chamber R3 is low and the pressure in the chamber R1 is high, and the piston 35, 36 to the slide valve 34 move to the left side in the drawing to connect the suction pipe 6 to the conduit 8.
When the solenoid coil 46 is energized and the plunger 43 is sucked, the slide valve 41 moves to the left and the low pressure bleed pipe 6a is brought into communication with the communication pipe 40, and high pressure flows into the communication pipe 39, causing the chamber to The pressure in R3 becomes high and the pressure in chamber R1 becomes low, and the slide valve 34 moves to the right in the drawing, thereby communicating the suction pipe 6 with the conduit 7.

〔effect〕

As described above, the present invention has three through holes (1a) for the compressor suction pipe and the heat exchanger conduit in the reversing valve body, and three (1a) through holes corresponding to the three through holes in the slide valve seat. The valve seat is held in a predetermined position in the reversing valve main body by a presser jig, and the inner peripheral surface of the reversing valve main body and the presser jig are formed at wall portions at both ends of the valve seat in the circumferential direction. A space for a wax reservoir defined by a jig is formed, and the suction pipe and conduit are inserted from the through hole of the reversing valve body into the through hole of the valve seat, and from around the suction pipe and conduit into each through hole. Since the solder metal is made to flow into the valve seat, it is possible to reliably prevent the solder metal from reaching the smooth surface of the valve seat when welding the valve seat to the reversing valve body and the suction pipe or conduit. This can improve product yield.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a four-way reversing valve according to the present invention, FIG. 2 is a sectional view of a plug body having a pilot pressure switching mechanism,
Fig. 3 is a diagram of the operating state of the same as above, Fig. 4 is a sectional view of the valve seat and the brazing material of the container pipe showing the process, Fig. 5 is a sectional view of the brazing material of the same as above showing the completed state, and Fig. 6 is a four-sided view. A cross-sectional view of another embodiment of the reversing valve, and FIG. 7 is a cross-sectional view showing the state of the brazing material in the conventional example. l... Reversing valve body, a, b, c... Through hole, 4...
Compressor, 6... Suction pipe, 7, 8... Conduit, 11...
・Valve seat, 11a, L1b, 11c
---Through hole, 11 d--Smooth surface, 11e...Wall surface portion, 12...Slide valve, r...Space for mouth stopper, T...Press jig, S... Row.

Claims (1)

[Claims] In a reversing valve for a reversible refrigeration cycle in which a slide valve is moved by selectively communicating discharge pressure or suction pressure of a compressor to one end of a cylindrical reversing valve body, the suction pipe of the compressor is connected to the reversing valve body. and three through holes for the conduit of the heat exchanger, and three through holes corresponding to the three through holes are formed in the valve seat for the slide valve, and the valve seat is inserted into the reversing valve body. The valve seat is held in a predetermined position by a holding jig to form a wax reservoir space defined by the inner circumferential surface of the reversing valve main body and the holding jig at the wall portions at both ends of the valve seat in the circumferential direction, and the reversing The suction pipe and the conduit are inserted from the through hole of the valve body into the through hole of the valve seat, and molten wax is allowed to flow into the gap between the circumference of the suction pipe and the conduit and the peripheral edge of each through hole. A method of manufacturing a four-way reversing valve.