JP2009144880A - Piston device for four-way switching valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure normal movement of a piston device for a four-way switching valve, to prevent sealing failure of a packing interposed between the inside of a valve body and an operating chamber, and to certainly lock a bolt for fixing the piston to a connecting plate. <P>SOLUTION: This piston device is used for the four-way switching valve 1 provided with the cylindrical valve body 2, a plug body 11 jointed to the opening end portion 2a of the valve body by brazing 10, and the piston device 3 slid inside of the valve body in conjunction with a valve element and forming the operating chamber 13 together with the plug body. A plate member 7 composed of a base bottom portion 7a and a rising bent part 7b rising from a bottom surface portion toward the plug body is provided on a side opposed to the operating chamber, the open end portion 7e of the rising bent portion of the plate member abuts on the plug body in a position separated from a joint portion 16 of the valve body and the plug body, and the operating chamber is formed by the plate member and plug body. The packing 6 for sealing a portion between the inside of the valve body and the operating chamber is provided on a side opposed to the inside of the valve body of the piston device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a piston device of a four-way switching valve used in equipment using a reversible refrigeration cycle such as refrigeration equipment and air conditioning equipment.

  Conventionally, a four-way switching valve is arranged in the refrigerant passage of the refrigeration cycle to switch the refrigerant passage to switch between indoor cooling and heating. As such a four-way switching valve, various ones have been proposed in Patent Documents 1 and 2 and the like.

  For example, as shown in FIG. 6, these four-way switching valves are provided with a piston device 33 for moving a valve body (not shown) for switching a fluid passage inside the valve main body 32. It is interposed between the upper working chamber 43 and the lower high pressure chamber 44 and slides inside the valve body 32. The working chamber 43 formed between the piston device 33 and the plug body 41 is connected to a four-way switching pilot valve (not shown) via a conduit 42.

  In the above configuration, the plug 41 is joined to the open end 32 a of the valve body 32 by brazing 40. The piston device 33 includes two clamping plates 35A and 35B, a packing 36, and a caulking plate 37. The piston device 33 is fastened by a bolt 38 to a connecting plate 34 for connecting the piston device 33 to a valve body. In addition, each member constituting the piston device 33 is caulked and coupled by a rivet 39.

As shown in FIG. 7, the caulking plate 37 is a cross-shaped plate-like member that is not only coupled to the first clamping plate 35 </ b> A, the second clamping plate 35 </ b> B (see FIG. 1), and the packing 36 by rivets 39. The heads of the bolts 38 are caulked from both sides by the upright portions 37 a and 37 b and fixed on the plate 37, and function as detents for the bolts 38.
JP 11-201297 A JP 2004-125238 A

  However, in the conventional four-way switching valve 31, since the plug body 41 is brazed 40 to the open end portion 32 a of the valve body 32, the lower end portion outer peripheral surface of the plug body 41 and the upper end portion inner periphery of the valve main body 32. Wax and flux leak into the valve main body 32 from the joint 46 with the surface, preventing normal movement of the piston device 33, or generating a gap between the packing 36 and the valve main body 32, causing the seal failure. There was a problem that there is a risk of becoming.

  In the four-way switching valve 31, the bolts 38 are fixed by caulking the heads of the bolts 38 from both sides by the rising portions 37a and 37b of the caulking plate 37, but the rising portions 37a and 37b are formed of thin plates. Therefore, when the bolt 38 rotates, the upright portions 37a and 37b are outside (in the direction of the arrows) from the narrow portion 37c on the surface side of the caulking plate 37 of the upright portions 37a and 37b. There is a possibility that it will expand toward the bottom and will not function as a detent for the bolt 38.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and ensures normal movement of the piston device of the four-way switching valve, and is interposed between the inside of the valve body and the working chamber. An object of the present invention is to prevent the sealing failure of the packing and to reliably prevent the bolt for fixing the piston device to the connecting plate.

  In order to achieve the above object, the present invention provides a cylindrical valve body, a plug body brazed to the open end of the valve body, and the interior of the valve body sliding in conjunction with the valve body. The piston device used in a four-way switching valve comprising a piston device that forms a working chamber with the plug body, wherein the base portion and the base portion toward the plug body side are provided on a side facing the working chamber. A plate member composed of an upright bent portion, and the open end portion of the upright bent portion of the plate member at a position spaced from a joint portion between the valve body and the plug body and the plug body. The working chamber is formed by the plate member and the plug body.

  According to the present invention, the open end of the bent portion of the plate member abuts on the plug body at a position spaced from the joint between the valve body and the plug body, and the plate member and the plug body Since the working chamber is formed, the normal movement of the piston is not hindered even when brazing or flux leaks into the valve body from the joint portion formed by brazing the plug body with the valve body.

  In the piston device for a four-way switching valve, a packing for sealing between the inside of the valve body and the working chamber can be provided on the side facing the inside of the valve body. According to this configuration, since the packing and the joint portion between the plug valve body and the plug body are separated by the plate member, brazing and flux are generated from the joint portion formed by brazing the plug body and the valve body. Even when leaking into the valve body, a gap is not generated between the packing and the valve body, and a seal failure can be prevented.

  In the four-way switching valve piston device, a bolt fixing portion for fastening to a connecting plate for connecting the piston device to the valve body may be provided at the base portion of the plate member. By using the plate member for fixing the bolt, the number of parts can be reduced, and a compact piston device can be configured.

  In the piston device for the four-way switching valve, the bolt fixing portion of the plate member includes a cylindrical portion standing in a cylindrical shape from the base portion toward the plug body, and at least a part of the cylindrical portion. By caulking and deforming, the head portion of the bolt housed in the cylindrical portion can be fixed to the base portion.

  Further, the fixing portion of the bolt of the plate member is provided with a plurality of protruding pieces standing so as to protrude from the base portion toward the plug body, and at least one of the plurality of protruding pieces is caulked and deformed By doing so, the head portion of the bolt surrounded by the plurality of protruding pieces can be configured to be fixed to the base portion.

  Further, the fixing portion of the bolt of the plate member is provided with a plurality of protruding pieces formed by cutting out the base portion, and by caulking and deforming at least one of the plurality of protruding pieces, the plurality of protruding portions It can comprise so that the head of the said bolt enclosed by the piece may be fixed to the said base.

  As described above, according to the present invention, the normal movement of the piston device of the four-way switching valve is ensured, the sealing failure of the packing interposed between the inside of the valve body and the working chamber is prevented, and the piston device is It is possible to provide a piston device for a four-way switching valve that can surely prevent rotation of a bolt for fixing to a connecting plate.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a piston device for a four-way switching valve according to the present invention. The four-way switching valve 1 moves a valve body (not shown) for switching a fluid passage into a valve body 2. The piston device 3 is provided between the upper working chamber 13 and the lower high pressure chamber 14 and slides in the valve body 2 in the vertical direction. The working chamber 13 formed between the piston device 3 and the plug body 11 is connected to a four-way switching pilot valve (not shown) via a conduit 12. The plug body 11 and the valve body 2 are joined to the open end 2 a of the valve body 2 by brazing 10.

  The piston device 3 includes two clamping plates 5A and 5B, a packing 6, an auxiliary spring 15, and a plate member 7. A bolt 8 is connected to a connecting plate 4 for connecting the piston device 3 to a valve body. The members constituting the piston device 3 are caulked and joined by rivets 9. The auxiliary spring 15 is formed of a thin plate spring material such as a stainless thin plate, and applies an urging force so as to supplement the adhesion (sealability) of the packing 6 into the valve body, thereby improving the adhesion (sealability) of the packing 6. Secure stably over a long period of time.

  As shown in FIG. 2, the plate member 7 disposed on the side of the piston device 3 facing the working chamber 13 is erected from the base portion 7 a and from the base portion 7 a toward the plug body 11 (upward). 1, a position where the open end portion 7 e of the standing bent portion 7 b of the plate member 7 is separated from the joint portion 16 by brazing the valve body 2 and the plug body 11 as shown in FIG. 1. , The plate member 7 and the plug body 11 form the working chamber 13.

  Further, the plate member 7 includes a cylindrical portion 7c for fixing the bolt 8 on the base portion 7a as shown in FIGS. 3A and 3B, and a cylindrical portion as shown in FIG. Abutting portions 7d (six locations) formed by caulking and deforming the portion 7c from the outside toward the bolt 8 are brought into contact with the head of the bolt 8, and the bolt 8 is fixed on the base portion 7a.

  With the above configuration, when the plug 11 is brazed 10 to the open end 2 a of the valve body 2, even when brazing or flux leaks from the joint 16 into the valve body 2, the bent portion 7 b of the plate member 7. Since the open end portion 7e is located away from the joint portion 16 between the plug body 11 and the valve body 2, the normal movement of the piston device 3 is not hindered, and the packing 6 is also separated from the joint portion 16. Since it is in the position, the gap between the packing 6 and the valve main body 2 is not expanded by wax or flux and does not cause a seal failure.

  Further, since the bolt 8 is fixed on the base portion 7a by the cylindrical portion 7c and the contact portion 7d of the plate member 7, the rotation of the head of the bolt 8 can be prevented, and the bolt 8 is firmly fixed. be able to.

  FIG. 4 shows a first modified example of the fixing structure of the head of the bolt 8 by the plate member 7. In this structure, as shown in FIGS. As shown in FIG. 4C, the projecting piece 7f is erected from the outside toward the bolt 8 so as to contact the head of the bolt 8, and the bolt 8 is placed on the base portion 7a. It is fixed to.

  FIG. 5 shows a second modified example of the fixing structure of the head of the bolt 8 by the plate member 7. In this structure, as shown in FIGS. 5 (a) and 5 (b), the base portion 7a is cut away. A plurality of (four) protruding pieces 7h are formed by forming (notched portions 7g), and the protruding pieces 7h are caulked and deformed from the outside toward the bolts 8 as shown in FIG. The bolt 8 is fixed on the base portion 7a.

  In the above embodiment, as shown in FIG. 2, the plate member 7 has been described as having the cylindrical bent portion 7b formed on the outer peripheral portion of the base portion 7a. 7b is not limited to a shape integrally connected in a cylindrical shape, and may be a plurality of standing bent portions having several cuts in the cylindrical portion.

  In addition, the piston device 3 located at one end of the valve body 2 of the four-way switching valve 1 has been described as an example, but it is of course possible to provide the piston device 3 having the above configuration at both ends of the valve body 2. is there.

It is sectional drawing which shows the piston apparatus for four-way switching valves concerning this invention, and its vicinity. It is a figure which shows the piston apparatus for four-way selector valves of FIG. 1, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a). It is a figure which shows the plate member of FIG. 2, and a volt | bolt, Comprising: (a) is sectional drawing which shows the state before crimping the cylindrical part of a plate member, (b) is the same top view, (c) is a plate member It is a top view which shows the state after caulking the cylindrical part. It is a figure which shows the modification of the plate member of the piston apparatus for four-way selector valves concerning this invention, Comprising: (a) is sectional drawing which shows the state before crimping the protrusion piece of a plate member, (b) is the same plane FIG. 4C is a plan view showing a state after the projecting piece of the plate member is caulked. It is a figure which shows the modification of the plate member of the piston apparatus for four-way selector valves concerning this invention, Comprising: (a) is sectional drawing which shows the state before crimping the protrusion piece of a plate member, (b) is the same plane FIG. 4C is a plan view showing a state after the projecting piece of the plate member is caulked. It is sectional drawing which shows the conventional piston apparatus for four-way switching valves, and its vicinity. It is a figure which shows the piston apparatus for four-way selector valves of FIG. 6, Comprising: (a) is a front view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Four-way switching valve 2 Valve body 2a Open end part 3 Piston apparatus 4 Connecting plate 5A 1st clamping plate 5B 2nd clamping plate 6 Packing 7 Plate member 7a Base part 7b Standing bending part 7c Cylindrical part 7d Contact part 7e Open end part 7f Projection piece 7g Notch 7h Projection piece 8 Bolt 9 Rivet 10 Brazing 11 Plug body 12 Conduit 13 Working chamber 14 High-pressure chamber 15 Auxiliary spring 16 Joint

Claims (6)

A tubular valve body, a plug body brazed to the open end of the valve body, and sliding inside the valve body in conjunction with the valve body to form a working chamber with the plug body The piston device used in a four-way switching valve comprising a piston device,
On the side facing the working chamber, a plate member comprising a base portion and a standing bent portion standing from the base portion toward the plug body side is provided, and an open end portion of the standing bent portion of the plate member is A piston device for a four-way switching valve, wherein the piston member abuts on the plug body at a position spaced from the joint between the valve body and the plug body, and the plate member and the plug body form the working chamber. .   The piston device for a four-way switching valve according to claim 1, further comprising a packing for sealing a space between the inside of the valve body and the working chamber on a side facing the inside of the valve body.   3. The four-way switching valve according to claim 1, wherein a fixing portion of a bolt fastened to a connecting plate for connecting the piston device to the valve body is provided in the base portion of the plate member. Piston device.   The bolt fixing portion of the plate member includes a cylindrical portion erected in a cylindrical shape from the base portion toward the plug body, and caulking and deforming at least a part of the cylindrical portion, thereby 4. The piston device for a four-way switching valve according to claim 3, wherein a head portion of the bolt accommodated in the shape portion is fixed to the base portion.   The fixing portion of the bolt of the plate member includes a plurality of projecting pieces standing so as to project from the base portion toward the plug body, and caulking and deforming at least one of the plurality of projecting pieces. The four-way switching valve piston device according to claim 3, wherein a head portion of the bolt surrounded by the plurality of projecting pieces is fixed to the base portion.   The fixing portion of the bolt of the plate member includes a plurality of protruding pieces formed by cutting out the base portion, and by caulking and deforming at least one of the plurality of protruding pieces, 4. The piston device for a four-way switching valve according to claim 3, wherein a head portion of the enclosed bolt is fixed to the base portion.

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