CN115727163A - Assembly method of reversing valve - Google Patents

Abstract

The invention provides an assembling method of a reversing valve, which comprises the following steps: providing a connecting rod, a first piston and a second piston, assembling the connecting rod, the first piston and the second piston into a piston connecting rod assembly, providing a main valve body and a valve core, assembling the piston connecting rod assembly and the valve core into the main valve body, providing a first sleeve and a first limiting piece, assembling the first piston into the first sleeve, assembling the first limiting piece into a first limiting part of the first sleeve, and fixing the first sleeve and the main valve body. The assembly process is simple.

Description

Assembly method of reversing valve

[ technical field ] A

The invention relates to the field of fluid control, in particular to an assembly method of a reversing valve.

[ background of the invention ]

In the air conditioning system, the function conversion of refrigeration and heating is realized through a reversing valve.

The reversing valve comprises a pilot valve and a main valve, wherein the main valve comprises a main valve body, a valve seat, a sliding bowl, a piston connecting rod assembly and sleeves positioned at two ends of the main valve body, the inner wall of the main valve body is approximately cylindrical, the valve seat is provided with a cambered surface which is matched and welded with the main valve body, and the sliding bowl slides on the valve seat under the pushing of the piston connecting rod.

During assembly, the valve seat is placed into the main valve body to be subjected to furnace welding, then the piston connecting rod assembly and the end cover are assembled, and the assembly process is complex.

[ summary of the invention ]

The assembly method of the reversing valve comprises the following steps:

providing a connecting rod, a first piston and a second piston, assembling the connecting rod, the first piston and the second piston into a piston connecting rod assembly, providing a main valve body and a valve core, assembling the piston connecting rod assembly and the valve core into the main valve body, providing a first sleeve and a first limiting piece, assembling the first piston into the first sleeve, assembling the first limiting piece into a first limiting part of the first sleeve, and fixing the first sleeve and the main valve body.

The reversing valve is provided with the first sleeve and the first limiting piece, the first piston is installed into the first sleeve, the first limiting piece is installed into the first limiting portion, and the assembling process is simple.

Drawings

FIG. 1 is a perspective view of a diverter valve according to the present invention;

FIG. 2 is a cross-sectional view of one embodiment of the diverter valve of the present invention;

FIG. 3 is a perspective view of a main valve body of the present invention;

FIG. 4 is a perspective view of one embodiment of a connecting rod of the present invention;

FIG. 5 is a perspective view of the valve cartridge of the present invention;

FIG. 6 is a perspective view of one embodiment of a first sleeve of the present invention;

FIG. 7 is a schematic view of an embodiment of the first rod and first sleeve of the present invention engaged therewith;

FIG. 8 is a perspective view of another embodiment of the first sleeve of the present invention;

FIG. 9 is a perspective view of yet another embodiment of the first sleeve of the present invention;

FIG. 10 is a top view of the valve body of the present invention;

FIG. 11 is a top view of the first sleeve of the present invention;

FIG. 12 is a flow chart of an assembly of the diverter valve of the present invention;

FIG. 13 is a flow chart of yet another assembly of the reversing valve of the present invention

FIG. 14 is a flow chart of the assembly of the first rod with the first and second mounting holes of the present invention;

FIG. 15 is another flow chart of the assembly of the first rod with the first and second mounting holes of the present invention.

Reference numerals:

the main valve 1, the main valve body 11,

the body portion 111 is formed of a plastic material,

a first portion 112, a first hole 1121, a second hole 1122, a third hole 1123, a second bottom wall 1124, a fifth notch 1125, a first stepped portion 1126, a second stepped portion 1127,

the second portion 113, the fourth hole 1131, the sixth notch portion 1132,

the first mating portion 114, the fourth wall 115,

the valve spool 12, the first wall surface 121, the groove 122,

the rod 131, the second body 1311, the first stopper 1312, the second stopper 1313, the first piston 132, the second piston 133,

the first sleeve 14, the second wall surface 141, the first notch 142, the second notch 143, the first mounting hole 144, the second mounting hole 145, the first body portion 146, the first projection 147, the second projection 148,

a first limiting member 15, a second sleeve 16, a second limiting member 17,

the pilot valve 2, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5 and the fourth connecting pipe 6.

Detailed Description

The following describes a technical solution of an embodiment with reference to the drawings.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes, combinations and equivalents may be made therein without departing from the spirit and scope of the invention.

Referring to fig. 1-3 and 5, the reversing valve is a four-way reversing valve as an example, the reversing valve includes a main valve 1 and a pilot valve 2, the main valve 1 includes a main valve body 11, a valve core 12 and a piston rod 131 assembly capable of pushing the valve core 12, an inner wall surface of the main valve body 11 is substantially arc-shaped, the valve core 12 has a first wall surface 121 adapted to the inner wall surface of the main valve body 11, the first wall surface 121 is arc-shaped, the valve core 12 has a groove 122, and an opening of the groove 122 is located on the first wall surface 121.

Referring to fig. 2, the main valve body 11 includes a main body 111 and a first portion 112, a wall thickness of the main body 111 is smaller than a wall thickness of the first portion 112, the first portion 112 protrudes from an outer wall surface of the main body 111, an inner wall surface of the main valve body 11 includes a first fitting portion 114, the first fitting portion 114 is slidably fitted to the first wall surface 121, and at least a portion of the first fitting portion 114 is located at the first portion 112.

Referring to fig. 1 and 2, the direction valve has a first state and a second state, the first portion 112 has a first hole 1121, a second hole 1122, and a third hole 1123, in the first state, the spool 12 is in the first position, the groove 122 communicates the first hole 1121 with the second hole 1122, and fluid can flow from the first hole 1121 to the second hole 1122 through the groove 122; in the second state, the spool 12 is in the second position, the groove 122 communicates the second hole 1122 and the third hole 1123, the fluid can flow from the second hole 1122 to the third hole 1123 through the groove 122, and the first hole 1121 does not communicate with the groove 122, thereby achieving switching of the fluid flow path by the selector valve.

The reversing valve comprises a main valve body 11 with an arc-shaped inner wall surface, a valve core 12 with a first wall surface 121 matched with the inner wall surface of the main valve body 11, a main body part 111 and a first part 112, wherein the thickness of the main body part 111 is smaller than that of the first part 112, at least part of the valve core 12 can slide on the first part 112, and the strength of the main valve body 11 is improved.

Referring to fig. 2, the direction valve includes a first connection pipe 3, a second connection pipe 4, and a third connection pipe 5, the first connection pipe 3 is welded to a wall portion corresponding to the first hole 1121, the second connection pipe 4 is welded to a wall portion corresponding to the second hole 1122, and the third connection pipe 5 is welded to a wall portion corresponding to the third hole 1123.

Referring to fig. 2 and 3, the first portion 112 has a second bottom wall 1124, the opening of the first hole 1121, the opening of the second hole 1122 and the opening of the third hole 1123 are all located on the second bottom wall 1124, the second bottom wall 1124 is substantially perpendicular to an axis of the first adapter tube 3 at one end of the first hole 1121, the second bottom wall 1124 is a plane, the contact area of the first portion 112 with the first adapter tube 3, the second adapter tube 4 and the third adapter tube 5 is increased, and the stability of assembly is improved.

Referring to fig. 3, the first portion 112 extends in the axial direction of the inner wall surface of the main valve body 11, and one end of the first portion 112 is substantially flush with one end of the body portion 111 and the other end of the first portion 112 is substantially flush with the other end of the body portion 111 in the axial direction of the inner wall surface of the main valve body 11, thereby increasing the strength of the main valve body 11.

Referring to fig. 2, the main valve body 11 further includes a second portion 113, the wall thickness of the main valve body 111 is smaller than that of the second portion 113, the second portion 113 protrudes from the outer wall surface of the main valve body 111, the first portion 112 and the second portion 113 are located on the opposite sides of the inner wall surface of the main valve body 11 in the radial direction, the second portion 113 has a fourth hole 1131, the reversing valve includes a fourth adapter 6, and one end portion of the fourth adapter 6 is at least partially welded to the wall portion of the second portion 113 corresponding to the fourth hole 1131.

Of course, the first portion 112 and the main body portion 111 may be integrally formed or welded, and the second portion 113 and the main body portion 111 may be integrally formed or welded, which is not described herein again.

Referring to fig. 2 and 4, the reversing valve further includes a first sleeve 14 and a first limiting member 15, the first sleeve 14 is connected to an end of the main valve body 11, for example, the first sleeve 14 is partially located in the main valve body 11, an outer wall of the first sleeve 14 is welded to an inner wall surface of the main valve body 11, the first limiting member 15 extends substantially along a radial direction of the inner wall surface of the main valve body 11, the piston rod 131 assembly includes a connecting rod 131, an end of the first limiting member 15 is fixedly connected or limitedly connected to the main valve body 11 and/or the first sleeve 14, the first limiting member 15 abuts against the connecting rod 131, for example, the connecting rod 131 includes a second body 1311, the second body 1311 is substantially plate-shaped, the first limiting member 15 is disposed along a width direction of the second body 1311, the first limiting member 15 abuts against the second body 1311, and the connecting rod 131 is prevented from rotating, so as to prevent the valve core 12 from rotating relative to the inner wall of the main valve body 11.

Of course, the shape of the second body 1311 may be other, and the shape of the first stopper 15 may be set as needed, so that the first stopper 15 abuts against the second body 1311 to prevent the rotation of the link 131.

The reversing valve includes a first limiting member 15 extending substantially in a radial direction of the main valve body 11, one end of the first limiting member 15 is fixedly connected or limitedly connected to the main valve body 11 and/or the first sleeve 14, and the first limiting member 15 abuts against the connecting rod 131 to prevent the sliding bowl from rotating.

Referring to fig. 4, the link 131 further includes a first blocking portion 1312 and a second blocking portion 1313, the first blocking portion 1312 protrudes from the second body portion 1311, the second blocking portion 1313 protrudes from the second body portion 1311 in the same direction as the first blocking portion 1312, the first blocking portion 1312 is located at substantially the center of the second body portion 1311, and the second blocking portion 1313 is located at substantially the center of the second body portion 1311 in the width direction of the second body portion 1311.

Referring to fig. 2 and 4, the first limiting member 15 and the second limiting member 17 are located on the same side of the second main body 1311, the distance between the top end of the first blocking portion 1312 and the second main body 1311 is greater than the distance between the highest point of the first limiting member 15 and the second main body 1311 in the radial direction of the main valve 11, the distance between the top end of the second blocking portion 1313 and the second main body 1311 is greater than the distance between the highest point of the second limiting member 17 and the second main body 1311, the piston rod 131 assembly includes the first piston 132 and the second piston 133 located at both ends of the connecting rod 131, the first piston 132 is slidable in the first sleeve 14, the second piston 133 is slidable in the second sleeve 16, and in the axial direction of the main valve 11, the first blocking portion 1312 is located between the first limiting member 15 and the second limiting member 17, the first limiting member 15 is located between the first blocking portion 1312 and the first piston 132, the second blocking 1313 is located between the second limiting member 1313 and the second piston 133.

When the valve body 12 is at the first position in the radial direction of the main valve body 11, the side wall of the first stopper 1312 abuts against the first stopper 15, and when the valve body 12 is at the second position, the side wall of the second stopper 1313 abuts against the second stopper 17, so that the rod 131 moves in the axial direction of the main valve body 11 within a certain range, thereby achieving the purpose of switching the flow path.

Of course, the second blocking portion 1313 may also protrude from the second body portion 1311 in a direction opposite to the first blocking portion 1312, the first blocking portion 1312 and the second blocking portion 1313 are located on opposite sides of the second body portion 1311, and the first limiting member 15 and the second limiting member 17 are located on opposite sides of the second body portion 1311, which is not described herein again.

Referring to fig. 6 to 7, the first sleeve 14 is provided with a first limiting portion, the first limiting portion includes a first mounting hole 144 and a second mounting hole 145, the peripheral wall of the first sleeve 14 is provided with the first mounting hole 144, one end of the first limiting member 15 is located in the first mounting hole 144, the peripheral wall of the first sleeve 14 is provided with the second mounting hole 145, the first mounting hole 144 is substantially opposite to the second mounting hole 145, the other end of the first limiting member 15 is located in the second mounting hole 145, and two ends of the first limiting member 15 are respectively abutted against the inner wall of the main valve body 11, so that the first limiting member 15 is prevented from moving in the radial direction of the main valve body 11, the stability of the reversing valve is improved, and noise is reduced.

Referring to fig. 2, the reversing valve further includes a second sleeve 16 and a second limiting member 17, the second limiting member 17 extends substantially in a radial direction of the second sleeve 16, the second sleeve 16 is connected to the other end portion of the main valve body 11, for example, the second sleeve 16 is partially located in the main valve body 11, an outer wall of the second sleeve 16 is welded to an inner wall surface of the main valve body 11, and the second limiting member 17 abuts against the connecting rod 131 to prevent the connecting rod 131 from rotating, thereby preventing the valve body 12 from rotating relative to the inner wall of the main valve body 11.

The second sleeve 16 is provided with a second limiting part, the second limiting part includes a third mounting hole and a fourth mounting hole, the peripheral wall of the second sleeve 16 is provided with the third mounting hole, one end of the second limiting part 17 is located in the third mounting hole, the peripheral wall of the second sleeve 16 is provided with the fourth mounting hole, the fourth mounting hole is approximately opposite to the third mounting hole, the other end of the second limiting part 17 is located in the fourth mounting hole, and the two ends of the second limiting part 17 are respectively abutted to the inner wall of the main valve body 11.

The first limiting member 15 and the second limiting member 17 are cylindrical, square, rectangular, etc., of course, both ends of the first limiting member 15 may be welded to the first sleeve 14 and/or the main valve body 11, and both ends of the second limiting member 17 may be welded to the first sleeve 14 and/or the main valve body 11, which will not be described herein.

Of course, only one end of the first limiting member 15 may be located in the first mounting hole 144, and the other end of the first limiting member 15 is suspended, for example, the other end of the first limiting member 15 is located substantially at the radial center of the main valve body 11, and only one end of the second limiting member 17 may be located in the third mounting hole, and the other end of the second limiting member 17 is suspended, for example, the other end of the second limiting member 17 is located substantially at the radial center of the main valve body 11, as long as the connecting rod 131 can be prevented from rotating, which is not described herein again.

Referring to fig. 2, the first limiting element 15 and the second limiting element 17 are located on the same side of the second main body 1311, and of course, the first limiting element 15 and the second limiting element 17 may also be located on opposite sides of the second main body 1311, which is not described herein again.

Referring to fig. 8, the first sleeve 14 has a second wall surface 141, the second wall surface 141 is located at the opening of the first sleeve 14, a plane where the second wall surface 141 is located is substantially perpendicular to an axis of the first sleeve 14, a first notch portion 142 is disposed on a peripheral wall of the first sleeve 14, the first notch portion 142 has an opening located on the second wall surface 141, one end of the first limiting member 15 limits the first notch portion 142, the first limiting member 15 is in transition fit with an inner wall corresponding to the first notch portion 142, and one end of the first limiting member 15 is fixedly connected or in limited connection with the inner wall of the first notch portion 142.

Referring to fig. 2, the inner wall surface corresponding to the accommodating cavity has a first step part 1126, and the second wall surface 141 is abutted against or welded and fixed to the first step part 1126.

Referring to fig. 8, in the radial direction of the first sleeve 14, the first notched portion 142 is recessed in the inner wall of the first sleeve 14, one end portion of the first limiting member 15 is welded to the bottom wall and/or the side wall of the first notched portion 142, in the radial direction of the first sleeve 14, the second notched portion 143 is recessed in the inner wall of the first sleeve 14, and the other end portion of the first limiting member 15 is welded to the bottom wall and/or the side wall of the second notched portion 143. .

Referring to fig. 2 and 8, the peripheral wall of the first sleeve 14 is provided with a second notch 143, the first notch 142 is substantially opposite to the second notch 143, the second notch 143 has an opening located on the second wall 141, the other end of the first limiting member 15 limits the second notch 143, the first limiting member 15 is in transition fit with the inner wall corresponding to the second notch 143, and the other end of the first limiting member 15 is fixedly or limitedly connected with the inner wall of the second notch 143, so as to facilitate the assembly of the first limiting member 15.

The second sleeve 16 has a third wall surface, the third wall surface is located at the opening of the second sleeve 16, the plane where the third wall surface is located is substantially perpendicular to the axis of the second sleeve 16, the peripheral wall of the second sleeve 16 is provided with a third gap portion and a fourth gap portion, the openings of the third gap portion and the fourth gap portion are located on the third wall surface, the third gap portion is limited by one end of the second limiting member 17, the fourth gap portion is limited by the other end of the second limiting member 17, the second limiting member 17 is in transition fit with the inner wall corresponding to the third gap portion, the second limiting member 17 is in transition fit with the inner wall corresponding to the fourth gap portion, the inner wall surface corresponding to the accommodating cavity has a second step portion 1127, the third wall surface is abutted against or welded and fixed to the second step portion 1127, and nothing herein is done.

Referring to fig. 9, in the radial direction of the first sleeve 14, the first notched portion 142 penetrates through the wall portion of the first sleeve 14, one end portion of the first stopper 15 is located in the first notched portion 142, and one end portion of the first stopper 15 is welded to the first sleeve 14 and/or the main valve body 11.

Referring to fig. 10 to 11, the main valve body 11 has a fourth wall 115, the fourth wall 115 is located at one end of the main valve body 11, a plane of the fourth wall 115 is substantially perpendicular to an axis of the main valve body 11, a circumferential wall of the main valve body 11 is provided with a fifth notch 1125, the fifth notch 1125 has an opening located on the fourth wall 115, one end of the first limiting member 15 is located in the fifth notch 1125, the circumferential wall of the main valve body 11 is provided with a sixth notch 1132, the sixth notch 1132 is substantially opposite to the fifth notch 1125, the sixth notch 1132 has an opening located on the fourth wall, and the other end of the first limiting member 15 is located in the sixth notch 1132.

Referring to fig. 10 to 11, in the radial direction of the main valve body 11, the fifth notch portion 1125 is recessed in the inner wall of the main valve body 11, the first sleeve 14 includes a first body portion 146, a first protrusion 147 and a second protrusion 148, the first protrusion 147 protrudes from the outer peripheral wall of the first body portion 146, the second protrusion 148 protrudes from the outer peripheral wall of the first body portion 146, in the radial direction of the opening of the first sleeve 14, the first protrusion 147 is substantially opposite to the second protrusion 148, the first protrusion 147 is located in the fifth notch portion 1125, the first protrusion 147 is fitted in the fifth notch portion 1125, the second protrusion 148 is located in the sixth notch portion 1132, the second protrusion 148 is fitted in the sixth notch portion 1132, the first protrusion 147 presses one end portion of the first stopper 15, and the second protrusion 148 presses the other end portion of the first stopper 15, so as to facilitate assembly.

Referring to fig. 12, a method of assembling a reversing valve includes the steps of: providing a connecting rod, a first piston and a second piston, assembling the connecting rod, the first piston and the second piston into a piston connecting rod assembly, providing a main valve body and a valve core, assembling the piston connecting rod assembly and the valve core into the main valve body, providing a first sleeve and a first limiting piece, assembling the first piston into the first sleeve, assembling the first limiting piece into a first limiting part of the first sleeve, and fixing the first sleeve and the main valve body.

The reversing valve is provided with the first sleeve and the first limiting piece, the first piston is installed into the first sleeve, the first limiting piece is installed into the first limiting portion, and the assembling process is simple.

Referring to fig. 13, a first adapter tube 3, a second adapter tube 4, a third adapter tube 5, and a fourth adapter tube 6 are provided, one end of the first adapter tube 3 is inserted into the first hole 1121 and welded to a wall portion corresponding to the first hole 1121, one end of the second adapter tube 4 is inserted into the second hole 1122 and welded to a wall portion corresponding to the second hole 1122, one end of the third adapter tube 5 is inserted into the third hole 1123 and welded to a wall portion corresponding to the third hole 1123, and one end of the fourth adapter tube 6 is inserted into the fourth hole 1131 and welded to a wall portion corresponding to the fourth hole 1131.

The connecting rod 131 of the piston and connecting rod assembly is partially bent to form a first stop 1312, the connecting rod 131 of the piston and connecting rod assembly is partially bent to form a second stop 1313 or a first stop 1312 and a second stop 1313 are provided, the first stop 1312 is welded to the connecting rod 131 of the piston and connecting rod assembly, and the second stop 1313 is welded to the connecting rod 131 of the piston and connecting rod assembly.

The piston connecting rod assembly is assembled with the valve core 12 and then is installed in the main valve body 11, the connecting rod 131 is provided with a containing part, the valve core 12 is partially positioned in the containing part, and then the valve core 12 and the piston connecting rod assembly extend into the containing cavity of the main valve body 11 from one end opening of the main valve body 11.

Of course, the connecting rod 131 and the valve core may be assembled and then installed in the main valve body 11, then the first piston 132 and the second piston 133 are respectively assembled at two ends of the connecting rod 131, or the first piston 132 and the connecting rod 131 are assembled, the valve core 12 and the connecting rod assembled with the first piston 132 are assembled and then installed in the inner cavity of the main valve body 11, and then the second piston 133 is assembled to the connecting rod 131, which is not described herein.

The first piston 132 is installed into the first sleeve 14, the first limiting member 15 is installed into the first limiting portion of the first sleeve 14, for example, one end portion of the first limiting member 15 is inserted into the first mounting hole 144, the other end portion of the first limiting member 15 is inserted into the second mounting hole 145, the first limiting member 15 abuts against the connecting rod 131, and the first limiting member 15 is located at the front side of the first piston 132 along the direction in which the first piston 132 is pushed into the first sleeve 14.

Of course, the first piston 132 may be first installed in the first sleeve 14, the first limiting member 15 may be installed in the first limiting portion of the first sleeve 14, and then the valve core 12 may be assembled with the accommodating portion of the connecting rod 131, which will not be described herein.

According to the reversing valve, the first sleeve 14 and the first limiting piece 15 are provided, the piston on one side of the piston connecting rod assembly is arranged in the first sleeve 14, the first limiting piece 15 is arranged in the first limiting part, and the assembly process is simple.

Referring to fig. 14, the first limiting member 15 is inserted into the first limiting portion, one end of the first limiting member 15 is inserted into the first mounting hole 144 from the inner side of the first sleeve 14, the first limiting member 15 is continuously moved in the direction substantially the same as the insertion direction, then the first limiting member 15 is moved in the direction substantially opposite to the insertion direction, and the other end of the first limiting member 15 is inserted into the second mounting hole 145 from the inner side of the first sleeve 14.

Referring to fig. 15, the first limiting member 15 is installed in the first limiting portion, the first sleeve 14 has a first installation hole 144 and a second installation hole 145, one end of the first limiting member 144 is inserted into the second installation hole 145, and the first limiting member 15 is continuously moved in a direction substantially the same as the insertion direction, so that one end of the first limiting member 15 is inserted into the first installation hole 144, and at this time, the other end of the first limiting member 15 is located in the second installation hole 145.

The first sleeve 14 is welded to the main valve body 11, for example, by laser welding, and both ends of the first limiting member 15 are welded to the inner wall of the main valve body 11, so that noise of the reversing valve is reduced.

Of course, the first limiting member 15 may also be welded to the first sleeve 14 first, and then the first sleeve 14 is pushed to make the first sleeve 14 partially located in the main valve body 11, and then the first sleeve 14 is welded to the main valve body 11, which will not be described herein.

And the piston on the other side of the piston and connecting rod assembly is arranged in the second sleeve 16, and the second limiting piece 17 is arranged in the second limiting part of the second sleeve, which is not described herein.

The first sleeve 14 has a first notch portion 142 and a second notch portion 143 recessed in an inner wall of the first sleeve 14, two ends of the first limiting member 15 are respectively disposed in the first notch portion 142 and the second notch portion 143, and the first sleeve 14 is welded to the main valve body 11, so that assembly is facilitated.

The first notch 142 is recessed in the inner wall of the first sleeve 14 in the radial direction of the first sleeve 14, and the second notch 143 is recessed in the inner wall of the first sleeve 14 in the radial direction of the first sleeve 14;

welding one end of the first limiting member 15 to the bottom wall and/or the side wall of the first notch portion 142;

welding the other end of the first stopper 15 to the bottom wall and/or the side wall of the second notch 143;

the first sleeve 14 is pushed so that a part of the first sleeve 14 is located inside the valve body 111, and the first sleeve 14 is welded with the valve body 111.

The welding between the second sleeve 16 and the second limiting member 17 or the welding between the second limiting member 17 and the valve body 111 is similar to the above, and is not described herein again.

The sequence of the steps does not represent the sequence of actual assembly, but is only for facilitating understanding of the invention, and corresponding sequence changes can be carried out according to requirements in the actual assembly process.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A method for assembling a reversing valve is characterized in that,

the method comprises the following steps:

providing a connecting rod, a first piston and a second piston, assembling the connecting rod, the first piston and the second piston into a piston-connecting rod assembly,

providing a main valve body and a valve core, assembling the piston connecting rod assembly and the valve core and then installing the main valve body,

providing a first sleeve and a first limiting piece, installing the first piston into the first sleeve, installing the first limiting piece into a first limiting part of the first sleeve, and fixing the first sleeve and the main valve body.

2. The assembly method of claim 1,

inserting one end of the first limiting member into the first mounting hole of the first sleeve from the inner side of the first sleeve,

and continuously moving the first limiting piece along the direction which is approximately the same as the inserting direction, then moving the first limiting piece along the direction which is approximately opposite to the inserting direction, and inserting the other end of the first limiting piece into the second mounting hole of the first sleeve from the inner side of the first sleeve.

3. The assembling method according to claim 1, wherein one end of the first stopper is inserted into the second mounting hole of the first sleeve, and the first stopper is further moved in substantially the same direction as the insertion direction so that the one end of the first stopper is inserted into the first mounting hole of the first sleeve while the other end of the first rod is positioned in the second mounting hole of the first sleeve.

4. Assembly method according to claim 2 or 3,

welding the first sleeve to the main valve body,

and welding two ends of the first limiting part with the inner wall of the main valve body.

5. The method of assembling of claim 4, wherein said shaft portion is bent to form a first stop and said shaft portion is bent to form a second stop.

6. The method of assembling as set forth in claim 4 wherein a first stop and a second stop are provided, said first stop being welded to said connecting rod and said second stop being welded to said connecting rod.

7. The assembling method according to claim 1, wherein both ends of the first stopper are respectively placed in the first notch portion and the second notch portion of the first sleeve, and the first sleeve and the main valve body are fixed.

8. The assembling method according to claim 7, wherein one end of the first retaining member is welded to the first notched portion of the first sleeve, and the other end of the first retaining member is welded to the second notched portion of the first sleeve.

9. An assembly method according to any one of claims 5 to 8, wherein a second sleeve and a second retaining member are provided, the second piston being fitted into the second sleeve and the second retaining member being fitted into the second retaining portion of the second sleeve.

10. An assembly method according to claim 9, wherein a nipple is provided, which is welded to the main valve body.

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