JPS61103080A - Manufacturing method of four-directional reversing valve - Google Patents

Abstract

PURPOSE:To maintain sealing tightness at an installed portion of a plug body by forming an escape system of flux gassified by heating oppositely to a solder- welded portion and in a direction inward to a reversing valve body. CONSTITUTION:As for fixation of a plug body 2 to a reversing valve body 1, firstly the first fixation is done when the plug body 2 is fixed into an end of the reversing valve body 1, and an annular convex row (1c) is formed on the reversing valve body 1 to fit into an annular engagement ditch (2f) of the plug body 2 through a rolling calking method. Then the second fixation is made by forming a brazed portion (2g') by soft soldering after pasting flux on an annular chamfer (2g) at the outerior end of the plug body 2. Gassified flux produced in soft soldering escapes through equalizer halls (2h) formed in the inward direction of the reversing valve body 1.

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 Conventionally, this type of reversing valve has a structure in which the pilot valve and the pilot valve are separated from the cylindrical reversing valve body and are connected by a pipe, but in this case, installation requires little space. Recently, a structure in which a pilot valve is provided at the axial end of a cylindrical reversing valve body has been developed. Tokuko Sho 5, which is based on the person's first application
The technique of No. 9-14664 is known. That is, in this known technique, the plug body incorporating the pilot valve is fixed to the end of the reversing valve body by caulking and brazing means.

Problem to be Solved In the conventional technology, when the plug body which is caulked to the reversing valve body is further brazed, the flux that has entered the gap in the caulked part is gasified by the heat of brazing and protrudes outside. As a result, voids and pinholes are generated in the brazed welded part, and the sealing performance of the fixed part cannot be ensured.

The present invention focuses on the above-mentioned points, and provides an escape structure for the flux gasified by heating toward the inside of the reversing valve body opposite to the brazed welding part.

[Structure of the invention]

Means for Solving the Problems In order to achieve the above object, in the present invention, an annular engagement groove is formed in advance on the outer circumferential surface of the stopper, which is equipped with an operating solenoid valve and has a pilot pressure switching operation mechanism. At the same time, a plurality of equalizer holes are formed which communicate with the annular engagement groove and open inside the plug body, and after the plug body is fitted into the reversing valve main body, the annular engaging groove is connected to the reversing valve main body by rolling caulking. In relation to the matching groove 1・A t '+ M 4 * '9:
:J! ! Gffetc I-Z * 1 & fil
Y'tr: i''r' Next, flux is applied to the annular chamfered portion at the outer end of the plug body, and then brazing is performed to perform secondary fixation.

Example Examples 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 main body 1, and a suction pipe 6 is connected to the suction side of the compressor 4. Conduits 7, 8 are connected to both sides thereof. Private pipes 7 and 8 are heat exchangers 9.10 that function reversibly as condensers or evaporators.
connected to. Inside the reversing valve body 1, a valve seat 11 having a series of smooth surfaces lid is welded over the suction pipe 6 and the conduits 7, 8 on both sides. The valve seat 11 has through holes 11a, llb, ll communicating with the suction pipe 6 and the conduits 7, 8.
It has c.

A communication lumen 12 is formed on the smooth surface lid of the valve seat 11.
A slide valve 12 having a diameter is slidably provided.

The large diameter cylinder part 1a and the small diameter cylinder part 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 8 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 20 is fixed. The electromagnetic valve 20 is a well-known three-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, and is placed in the pilot valve chamber R1 on the outside of the plug body, and faces 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 branching from the through hole 2b and communicating with the operation chamber R2, and connecting the operation chamber R2 and the plug. A suction hole 2d that communicates with a low pressure bleed pipe 6a connected to the body 2.
is formed. Inside the operation chamber R, a flat 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 is always attached in the valve closing direction by the cedar leaf spring 28. 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.
Press the middle part of 8 to move the flat valve 27 to the low pressure side valve seat 2.
e, and the suction hole 2d is opened. Pilot valve chamber R
A high pressure bleed pipe 5a branching from the discharge pipe 5 is connected to the inside of the pipe 1. A low pressure bleed pipe 6b is connected to the other plug body 3.

FIG. 1 shows the state when the electromagnetic coil 25 is de-energized, the plunger 22 is urged in the valve closing direction by the action of the return spring 24, and the ball valve 26 closes the high pressure side valve seat 1-23 and is driven. The flat valve 27 is separated from the low pressure side valve seat 2e via a rod 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 , 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 connects the suction pipe 6 and the conduit 8,
Refrigerant gas is transmitted through compressor 4 - discharge pipe 5 - conduit 7 - heat exchanger 9 -
It becomes a cycle circuit of heat exchanger 1〇-conduit 8-suction pipe 6-compressor 4.

Next, when the electromagnetic 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 7 are communicated, and the refrigerant residue forms a cycle circuit of compressor 4 - discharge pipe 5 - conduit 8 - heat exchanger 10 - heat exchanger 9 - conduit 7 - suction pipe 6 - compression chamber 4.

For fixing the plug 2 to the reversing valve main body l,
An annular engagement groove 2f is formed in advance on the circumferential surface of the reversing valve body 1. First, the plug body 2 is fitted onto the end of the reversing valve main body l, and the annular engaging groove 2f is formed in the reversing valve main body 1 by rolling caulking means. First fixing is performed by forming an annular protrusion lc that engages with the plug body 2, and then soft brazing is performed after applying flux to the annular chamfered portion 2g at the outer end of the plug body 2. ' to perform secondary fixation.

During soft brazing, flux that has entered the gap between the annular engagement groove 2f is gasified by the heat of brazing, and an equalizer hole 2h is formed in the annular engagement groove 2f toward the inside of the reversing valve body 1. Run away more.

〔effect〕

As described above, the present invention includes forming an annular engagement groove in advance on the outer circumferential surface of the plug, which is provided with an operating solenoid valve and has a pilot pressure switching operation mechanism, and communicates with the annular engagement groove so that the plug has a pilot pressure switching mechanism. A plurality of equalizer holes are formed that open inside the body, and after the plug body is fitted into the reversing valve main body, an annular protrusion that engages with the annular engagement groove is formed on the reversing valve main body by rolling caulking. The annular engagement groove is first fixed by applying flux to the annular chamfered portion at the outer end of the stopper, and then brazed to perform the second fixing. When the flux that has entered the valve gasifies due to the heat of brazing, it can escape into the reversing valve body through the equalizer hole, and voids and pinholes occur in the brazing part due to the protrusion of the gasified flux. To prevent this from happening and ensure the sealing of the part where the plug is attached.
I can do that.

[Brief explanation of the drawing]

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 showing the operating state of the same as above, and FIG. 4 is a sectional view showing details of the attachment part of the plug. 1... Cylindrical reversing valve body, 1c...
・Annular protrusion, 2...Plug body, 2f...Annular engagement groove, 2g...Annular chamfer, 2h...
...Equalizer hole, 4...Compressor. Patent applicant: H-Miya Seisakusho Co., Ltd. Figure 1

Claims (1)

[Claims] A four-way reversing valve for a reversible refrigeration cycle that selectively communicates discharge pressure or suction pressure of a compressor to one end of a cylindrical reversing valve body to move a switching valve body, is equipped with an operating solenoid valve. forming an annular engagement groove in advance on the outer peripheral surface of a plug body having a pilot pressure switching operation mechanism, and forming a plurality of equalizer holes communicating with the annular engagement groove and opening inside the plug body; After fitting the plug into the reversing valve main body, rolling crimping is performed to form an annular protrusion that engages in the annular engagement groove on the reversing valve main body to perform primary fixation;
A method for manufacturing a four-way reversing valve, characterized in that secondary fixation is performed by applying flux to the annular chamfered portion at the outer end of the plug and then brazing.