Solenoid switching valve

Abstract

An electromagnetic switching valve, characterized in that it includes a valve body, a piston assembly, a connecting rod, and a slider, the valve body includes a valve body main body and a first sleeve portion and a second sleeve portion, the connecting rod is fixedly connected to the piston assembly, the piston assembly includes a first piston and a second piston, the first piston is fixedly connected to one end of the connecting rod, the second piston is fixedly connected to the other end of the connecting rod, the first piston is slidably fitted with the inner wall of the first sleeve portion, and the second piston is slidably fitted with the inner wall of the second sleeve portion; the connecting rod includes at least one extension portion, and the maximum distance from the extension portion to the center line of the connecting rod is greater than the radius of the first sleeve portion or the second sleeve portion.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration control, and in particular to an electromagnetic switching valve. Background Art

[0002] Solenoid switching valves are used in refrigeration systems and are generally used to switch the refrigerant flow path to change the flow direction of the refrigerant. Examples include solenoid four-way valves, solenoid three-way valves, etc. The following uses a solenoid four-way valve as an example for explanation. Please refer to Figure 1 、 Figure 2 , Figure 1 The following is a schematic diagram of the structure of a typical electromagnetic four-way valve used in a refrigeration system. Figure 2 The present invention is a longitudinal cross-sectional view of a main valve of an electromagnetic four-way valve.

[0003] As shown in the figure, a conventional electromagnetic four-way valve is generally used in refrigeration systems such as air conditioning systems. It includes a main valve 10' and a pilot valve 20'. The main valve 10' includes a valve body 11'. The valve body 11' is generally cylindrical and has a D interface on its peripheral wall for connecting to the exhaust pipe D. A valve seat 13' is fixedly connected to the peripheral wall on the side opposite the D interface. The valve seat 13' has three holes, which are respectively used for fixed connection with the connecting pipe E, the suction pipe S, and the connecting pipe C. Because the cross-section of the valve body 11' is circular, the valve seat 13' is provided with an arc-shaped surface that matches the inner wall of the main valve body. That is, the longitudinal cross-section of the valve seat 13' is roughly D-shaped, and the two are fixed by welding.

[0004] The valve body 11' is connected to an exhaust pipe D connected to the compressor exhaust port (connected to the high-pressure area), an intake pipe S connected to the compressor intake port (connected to the low-pressure area), a pipe E connected to the indoor heat exchanger 30', and a pipe C connected to the outdoor heat exchanger 40'; end covers 12' are provided at both ends of the valve body 11', a valve seat 13' is fixed inside, and a slider 15' and a piston 16' driven by a connecting rod 14' are also provided. The valve seat 13' contacts and supports the slider 15', forming a pair of moving pairs, and the piston 16' and the valve body 11' form a pair of moving pairs.

[0005] The small valve body of the pilot valve 20' is fixedly provided with a capillary d connected to the exhaust pipe D of the main valve 10', that is, the inner cavity of the pilot valve 20' is also correspondingly connected to the high-pressure area of the main valve; the small valve seat of the pilot valve 20' has three valve ports, and is respectively fixed with capillaries e, s, and c connected to the left end cover of the main valve 10', the suction pipe S, and the right end cover of the main valve 10' from left to right; the right end of the small valve body of the pilot valve 20' is fixedly provided with a sleeve, and an electromagnetic coil 50' is provided on the outside of the sleeve.

[0006] In one working state, when the refrigeration system needs to cool, the electromagnetic coil 50' is not energized, and the core iron in the inner cavity of the pilot valve 20' drives the sliding bowl to the left position under the action of the return spring force, so that the capillary e and the capillary s are connected, and the capillary c and the capillary d are connected, so that the left cavity of the main valve 10' is a low-pressure area and the right cavity is a high-pressure area. The pressure difference force formed between the left and right cavities of the main valve 10' pushes the slider 15' and the piston 16' to the left, so that the connecting pipe E and the suction pipe S are connected, and the exhaust pipe D is connected with the connecting pipe C. At this time, the flow path of the refrigerant in the refrigeration system is: compressor exhaust port → exhaust pipe D → valve body 11 valve cavity → connecting pipe C → outdoor heat exchanger 40' → throttling element 60' → indoor heat exchanger 30' → connecting pipe E → inner cavity of the slider 15' → suction pipe S → compressor suction port, and the refrigeration system is in the cooling working state;

[0007] When the refrigeration system needs to heat, the electromagnetic coil 50' is energized, and the core iron in the inner cavity of the pilot valve 20' overcomes the force of the return spring and drives the sliding bowl to move right, so that the capillary c and the capillary s are connected, and the capillary e and the capillary d are connected, so that the left cavity of the main valve 10' is a high-pressure area and the right cavity is a low-pressure area. A pressure difference is formed between the left and right cavities of the main valve 10', pushing the slider 15' and the piston 16' to the right, so that the connecting pipe C and the suction pipe S are connected, and the exhaust pipe D is connected to the connecting pipe E. At this time, the flow path of the refrigerant in the refrigeration system is: compressor exhaust port → exhaust pipe D → valve body 11 valve cavity → connecting pipe E → indoor heat exchanger 30' → throttling element 60' → outdoor heat exchanger 40' → connecting pipe C → inner cavity of the slider 15' → suction pipe S → compressor suction port, and the refrigeration system is in heating working state.

[0008] As described above, the main valve 10' can be switched by the combined action of the pilot valve 20' and the electromagnetic coil 50', thereby switching the flow direction of the refrigerant and switching the refrigeration system between the heating and cooling working states. Summary of the Invention

[0009] An embodiment of the present invention aims to provide an electromagnetic switching valve with relatively precise piston and connecting rod positioning. To this end, at least one embodiment of the present invention adopts the following technical solutions:

[0010] A solenoid switching valve, characterized in that it includes a valve body, a piston assembly, a connecting rod, and a slider, the valve body including a valve body main body, a first sleeve portion, and a second sleeve portion, the first sleeve portion being directly or indirectly fixedly connected to the valve body main body, the second sleeve portion being directly or indirectly fixedly connected to the valve body main body, the area enclosed by the longitudinal cross-section of the first sleeve portion being smaller than the area enclosed by the longitudinal cross-section of the valve body main body, and the area enclosed by the longitudinal cross-section of the second sleeve portion being smaller than the area enclosed by the longitudinal cross-section of the valve body main body; the valve body main body including a first plate-shaped portion and a surrounding portion, the first plate-shaped portion and the surrounding portion being formed of an integral material, or the first plate-shaped portion and the surrounding portion being fixedly connected to form an integral structure;

[0011] The connecting rod is fixedly connected to the piston assembly, and the piston assembly includes a first piston and a second piston. The first piston is fixedly connected to one end of the connecting rod, and the second piston is fixedly connected to the other end of the connecting rod. The first piston slides in conjunction with the inner wall of the first sleeve portion, and the second piston slides in conjunction with the inner wall of the second sleeve portion. The connecting rod includes at least one extension portion, and the maximum distance from the extension portion to the center line of the connecting rod is greater than the radius of the first sleeve portion or the second sleeve portion.

[0012] The electromagnetic switching valve used in the above embodiment has a valve body that adopts a combined structure of a valve body main body and a sleeve portion, and an extension portion is provided on the connecting rod to abut against the valve body to achieve positioning, which is more conducive to ensuring relatively accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a solenoid four-way valve used in a refrigeration system is provided as a background technology;

[0014] Figure 2 It is a longitudinal cross-sectional view of a main valve of a solenoid four-way valve of the background technology;

[0015] Figure 3 A schematic diagram of the appearance of the electromagnetic switching valve provided by the first embodiment of the present invention;

[0016] Figure 4 A schematic cross-sectional view of a main valve of an electromagnetic switching valve provided by the first embodiment of the present invention;

[0017] Figure 5 A schematic structural diagram of the main body of the valve body provided in the first embodiment of the present invention;

[0018] Figure 6 A cross-sectional view of the valve body, valve seat, and slider structure provided by the first embodiment of the present invention;

[0019] Figure 7A schematic diagram of the structure of the valve body main body before processing provided by the second embodiment of the present invention;

[0020] Figure 8 A schematic diagram of the structure of the valve body, valve seat and slider provided in the third embodiment of the present invention;

[0021] Figure 9 A cross-sectional view of the valve body, valve seat, and slider structure provided by the third embodiment of the present invention;

[0022] Figure 10 This is a schematic diagram of the structure of the valve body, valve seat, and slider provided in the fourth embodiment of the present invention;

[0023] Figure 11 A cross-sectional view of the valve body, valve seat, and slider structure provided by the fourth embodiment of the present invention;

[0024] Figure 12 This is a schematic diagram of the structure of the valve body, valve seat, and slider provided in the fifth embodiment of the present invention;

[0025] Figure 13 A cross-sectional view of the valve body, valve seat, and slider structure provided by the fifth embodiment of the present invention;

[0026] Figure 14 A cross-sectional view of the valve body, valve seat, and slider structure provided in yet another embodiment of the present invention;

[0027] Figure 15 is a cross-sectional view of a main valve of an electromagnetic four-way valve provided by a sixth embodiment of the present invention;

[0028] Figure 16 is a front view of the piston-connecting rod assembly structure provided by the sixth embodiment of the present invention;

[0029] Figure 17 A schematic structural diagram of a connecting rod before assembly provided by a sixth embodiment of the present invention;

[0030] Figure 18 A schematic perspective view of the structure of a piston-connecting rod assembly according to a sixth embodiment of the present invention;

[0031] Figure 19 A cross-sectional view of a valve body according to a sixth embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, further detailed description is given below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Please refer to Figure 3 、 Figure 4 , Figure 3A schematic diagram of the appearance of the electromagnetic switching valve provided by the first embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of the main valve of the electromagnetic switching valve provided by the first embodiment of the present invention.

[0034] The electromagnetic switching valve of this embodiment is a four-way valve used to switch the flow direction of the refrigerant in the refrigeration system. Figure 3 、 Figure 4 As shown, the solenoid switching valve includes a valve body 1, which can be made of metal such as stainless steel. In this embodiment, the valve body 1 includes a valve body main portion 11, a first sleeve portion 12, and a second sleeve portion 13. The valve body main portion 11 is made of a stainless steel sheet. Specifically, it can be machined from a section of a square-cross-section stainless steel profile. The valve body main portion 11 includes a first plate-shaped portion 111 and a surrounding portion 112. The first plate-shaped portion 111 represents one face of a tetrahedron, and the surrounding portion 112 represents the remaining three faces of the tetrahedron. The valve body main portion 11 is provided with a first interface portion 1121 for fixed connection with the first connecting pipe 31. Specifically, a flange protruding toward the outside of the valve body main portion is provided on one wall portion of the surrounding portion 112 to facilitate fixing to the first connecting pipe 31. The first plate-shaped portion 111 is provided with three second interface portions 1122, respectively, for fixed connection with the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34. The first interface portion 1121 is arranged opposite to the three second interface portions 1122. It should be noted that this embodiment is a four-way valve, so the number of second interface portions 1122 is set to three. In other applications, such as a three-way valve, only two second interface portions can be provided. Inside the valve body main body 11, a valve seat 2 is fixedly connected to the inner side of the first plate-shaped portion 111. The valve seat 2 is generally plate-shaped and is provided with a through-hole portion 21 corresponding one-to-one with the second interface portion 1122. The valve seat 2 and the valve body main body 11 can be fixedly connected to form an integral structure by welding, or they can be fixed by bonding.

[0035] Connected to both ends of the valve body main body 11 are a first sleeve portion 12 and a second sleeve portion 13, each of which is open and closed at one end. The first sleeve portion 12 is fixedly connected to one end of the valve body main body 11 via a first connector 71, while the second sleeve portion 13 is fixedly connected to the other end of the valve body main body 11 via a second connector 72. Those skilled in the art will appreciate that the first and second connectors are intended to facilitate the connection of the sleeve portion to the valve body main body. Because the valve body main body comprises at least one plate-like portion, the cross-section of which may be rectangular, square, trapezoidal, or other irregular shapes, while the sleeve portion generally has a circular cross-section, the connectors facilitate this connection. However, in the absence of connectors, the open end of the sleeve portion can be stretched into a shape that matches the cross-sectional profile of the valve body main body. In this case, the connector is unnecessary, and the open end of the sleeve portion can be directly secured to the open end of the valve body main body, for example, by welding.

[0036] In this way, the valve body main body 11, the first sleeve portion 12, and the second sleeve portion 13 roughly enclose a valve cavity, and the refrigerant in the valve cavity can flow through the first connecting pipe 31, the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34. Specifically, during connection, it is sufficient to ensure that the first sleeve portion 12 and the second sleeve portion 13 remain coaxial. As for the relationship between the first sleeve portion 12 or the second sleeve portion 13 and the valve body main body 11, no special restrictions are required. It is only necessary to ensure that, after assembly, the piston connecting rod assembly and the slider described below can ensure that the slider can slide on the valve body main body or the valve seat while the piston component can move within the inner cavity of the first sleeve portion and the second sleeve portion.

[0037] Inside the valve body 1, there are a slider 6, a piston assembly and a connecting rod 5, wherein the piston assembly includes a first piston 41 and a second piston 42. The first piston 41 is fixedly connected to one end of the connecting rod 5, and the second piston 42 is fixedly connected to the other end of the connecting rod 5. The connecting rod 5 has a through hole that engages with the slider 6 to limit the position. In this way, when the connecting rod 5 moves in the left and right directions, it can drive the slider 6 to move together. The slider 6 is a roughly inverted bowl-shaped structure. Figure 4In the position shown, the inner cavity of the slider 6 connects the spaces within the second connecting pipe 32 and the third connecting pipe 33. When the slider 6 moves rightward to a preset position, the inner cavity of the slider 6 connects the spaces within the third connecting pipe 33 and the fourth connecting pipe 34. The first piston 41 can slide along the inner wall of the first sleeve portion 12, and the second piston 42 can slide along the inner wall of the second sleeve portion 13. In this way, the piston assembly divides the valve chamber into a first valve chamber 411, a second valve chamber 412, and a third valve chamber 413. When the pressures between the valve chambers differ, generating a pressure differential force, this pressure differential force can drive the piston assembly, connecting rod, and slider to move, thereby connecting the internal spaces of the second connecting pipe 32 and the third connecting pipe 33, or connecting the internal spaces of the third connecting pipe 33 and the fourth connecting pipe 34. In order to determine the stroke of the piston assembly, connecting rod and slider to the left and right, a limiting structure needs to be provided to position the piston assembly, connecting rod and slider to the left and right. In this embodiment, a first limiting portion 121 can be provided on the outer peripheral wall of the first sleeve portion 12. Specifically, the outer peripheral wall of the first sleeve portion 12 on the side close to its own bottom wall can be made to bulge inward by rolling. When the first piston 41 moves to the left, it can abut against the first limiting portion 121 to achieve positioning. Similarly, the outer peripheral wall of the second sleeve portion 13 on the side close to its own bottom wall can be made to bulge inward by rolling to form a second limiting portion 131. When the second piston 42 moves to the right, it can abut against the second limiting portion 131 to achieve positioning.

[0038] Of course, on the basis of this embodiment, the first sleeve portion 12 and the second sleeve portion 13 can also be set as unequal diameter structures, wherein the inner diameter of the opening side, that is, the part cooperating with the piston bowl, is larger than the inner diameter of the sealing side of the sleeve portion. In this way, a limiting portion is formed between the two sections with different inner diameters. Since the outer diameter of the piston bowl is adapted to the inner diameter of the large diameter part of the sleeve portion, the piston bowl cannot pass through the smaller inner diameter part of the sealing side of the sleeve portion, thereby achieving the purpose of positioning.

[0039] Please refer to Figure 5 、 Figure 6 ,in, Figure 5 A schematic structural diagram of the main body of the valve body provided in the first embodiment of the present invention; Figure 6 This is a cross-sectional view of the valve body, valve seat and slider structure provided by the first embodiment of the present invention.

[0040] In this embodiment, the valve body main body 11 is integrally formed from stainless steel. Specifically, a section can be cut from a prefabricated stainless steel pipe with a square cross-section. The valve body main body 11 includes a first plate-shaped portion 111 and a surrounding portion 112. In this embodiment, the surrounding portion 112 comprises the three surfaces other than the first plate-shaped portion 111. Three second interface portions 1122 are machined on the first plate-shaped portion 111, and a first interface portion 1121 is machined on the surrounding portion 112 at a position opposite the first plate-shaped portion 111. In this embodiment, the surrounding portion 112 also includes a second plate-shaped portion 1123, which is disposed opposite the first plate-shaped portion 111, with the first interface portion 1121 located within the second plate-shaped portion 1123. The second plate-shaped portion 1123 can be either a flat plate or a curved plate. The valve seat 2 is a plate-shaped structure and has through-hole portions 21, the number and position of which correspond to the second interface portions 1122. The valve seat 2 is fixedly connected to the inner side of the first plate-shaped portion 111 , and can be fixed by laser welding or gluing.

[0041] As a further embodiment, at least a portion of the second plate-shaped portion 1123 may be raised toward the first interface portion 1121, and the first interface portion 1121 may be provided on the raised portion of the second plate-shaped portion 1123. Figure 14 As shown, Figure 14 A cross-sectional view of the valve body main body, valve seat and slider structure provided for another embodiment of the present invention. The second plate-like portion 1123 protrudes upward to form a top protrusion 11231, and the first interface portion 1121 is arranged on the top protrusion 11231. Of course, the second plate-like portion 1123 can also be made into an upwardly protruding curved surface as a whole. The advantage of this arrangement is that the distance between the first interface portion 1121 and the first plate-like portion 111 can be made relatively farther, or in other words, when the slider and the connecting rod component are assembled, the first interface portion 1121 has a relatively farther distance from the top wall of the slider, and when the high-pressure refrigerant flows in from the first connecting pipe 31, there is a relatively larger space, which is conducive to optimizing the flow rate on the high-pressure side. It should be noted that the protruding structure of the second plate-like portion 1123 is also applicable to the second, third, fourth and fifth embodiments described below, and will not be described one by one.

[0042] The valve body structure provided by this embodiment utilizes a square-cross-sectioned valve body main portion and two sleeve portions connected directly or indirectly to form the valve body structure. In particular, the valve body main portion is directly manufactured from stainless steel, which is relatively inexpensive. Furthermore, the first plate-like portion itself is generally plate-shaped, and the valve seat is also plate-shaped, allowing for convenient welding and fixing. This eliminates the need for machining a D-shaped longitudinal cross-section valve seat as described in the background art. This seat fits within the curved inner wall of the main valve body, significantly reducing material and processing costs.

[0043] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of the valve body main body before processing provided by the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the valve body main body 11 is not made of a prefabricated stainless steel pipe with a square cross-section, but is formed by folding a stainless steel plate. Specifically, a stainless steel plate 110 is first prefabricated, and then four holes are punched out of the plate, and then the four holes are flanging to form a first interface portion 1121 and three second interface portions 1122 respectively. The stainless steel plate 110 is then bent into a square and fixed by welding at the seams. It will be understood by those skilled in the art that in this embodiment, a second plate-shaped portion 1123 can also be provided in the surrounding portion 112 as in the first embodiment, and the second plate-shaped portion 1123 is arranged opposite to the first plate-shaped portion 111, and the first interface portion 1121 is located at the second plate-shaped portion 1123.

[0044] The valve body structure provided in this embodiment is manufactured by rolling stainless steel sheet material. During the actual manufacturing process, the sheet material can be punched and flanging before being rolled into a square shape, resulting in relatively low manufacturing costs. Furthermore, the first plate-like portion itself is generally plate-shaped, and the valve seat is also plate-shaped, making them conveniently welded and fixed. This eliminates the need for machining a valve seat with a D-shaped longitudinal cross-section as described in the background art. This seat fits the curved inner wall of the main valve body, significantly reducing material and manufacturing costs.

[0045] Please refer to Figure 8 、 Figure 9 , Figure 8 A schematic diagram of the structure of the valve body, valve seat and slider provided in the third embodiment of the present invention; Figure 9 This is a cross-sectional view of the valve body, valve seat, and slider structure provided by the third embodiment of the present invention. This embodiment differs from the first embodiment in that the valve body 11 is made of a relatively thicker material, and the inner surface of the first plate-shaped portion 111 directly serves as the mating surface for the slider 6. In other words, a separate valve seat component is no longer provided. Instead, the first plate-shaped portion 111 also serves as the valve seat, and the slider 6 slides directly on the inner surface of the first plate-shaped portion 111.

[0046] The valve body structure provided in this embodiment adopts a valve body main body with a square cross section and two sleeve parts connected directly or indirectly to form a valve body structure. In particular, the valve body main body is directly made of stainless steel profiles, and the thickness is larger than that of the first embodiment, so that the valve body has higher pressure resistance. In addition, due to the relatively thick thickness, it is no longer necessary to set up a separate valve seat structure. Instead, the first plate-shaped part of the valve body main body directly assumes the function of the valve seat. That is, after surface processing, the slider is directly made to slide on the inner surface of the first plate-shaped part to achieve the switching function. The structure of this structure is relatively simpler and convenient for mass production. In addition, the first plate-shaped part itself is roughly plate-shaped, and the valve seat is also plate-shaped, so it can be easily welded and fixed. It is no longer necessary to process a valve seat with a D-shaped longitudinal cross section as described in the background technology to cooperate with the arc-shaped surface of the inner wall of the arc-shaped main valve body. Relatively speaking, a large amount of material cost and processing cost can be saved.

[0047] Please refer to Figure 10 、 Figure 11 , Figure 10 This is a schematic diagram of the structure of the valve body, valve seat, and slider provided in the fourth embodiment of the present invention; Figure 11 This is a cross-sectional view of the valve body, valve seat, and slider structure provided by the fourth embodiment of the present invention. This embodiment differs from the first embodiment in that the valve body main body 11 adopts a split structure, namely, the first plate-shaped portion 111 and the surrounding portion 112 are separately machined parts. This allows the first plate-shaped portion 111 to be manufactured from a relatively thicker stainless steel sheet and features three second interface portions 1122 for fixed connection with the second, third, and fourth connecting pipes 32, 33, and 34 of the four-way valve. The inner surface of the first plate-shaped portion 111 is designed to mate with the slider 6.

[0048] The valve body structure provided in this embodiment features a first plate-like portion formed from a separate component. The appropriate thickness can be selected and surface-processed, making it suitable for mass production and relatively easy to ensure its surface fits the sliding surface of the slider. The surrounding portion is formed by bending or curling a plate-like component, and the surface treatment of the surrounding portion does not require stringent requirements. This facilitates mass production and processing, saving manufacturing costs. Similarly, this embodiment does not require the production of a valve seat with a D-shaped longitudinal cross-section, as described in the background art, to mate with the curved inner wall of the arc-shaped main valve body. This can significantly save material and processing costs.

[0049] Please refer to Figure 12 、 Figure 13 , Figure 12 This is a schematic diagram of the structure of the valve body, valve seat, and slider provided in the fifth embodiment of the present invention; Figure 13This is a cross-sectional view of the valve body main body, valve seat, and slider structure provided in the fifth embodiment of the present invention. The valve body main body 11 is integrally formed of a stainless steel profile and includes a first plate-shaped portion 111 and a surrounding portion 112, wherein the first plate-shaped portion 111 is provided with a through-hole 1112, and the valve seat 2 is embedded in the hole 1112 and fixedly connected to the first plate-shaped portion 111 by welding. To further improve reliability, the material thickness of the valve seat 2 can be set to be greater than the material thickness of the first plate-shaped portion 111, and after the valve seat 2 is assembled with the first plate-shaped portion 111, it protrudes relative to both the inner side surface of the first plate-shaped portion 111 and the outer side surface of the first plate-shaped portion 111.

[0050] The valve body structure provided in this embodiment utilizes a square-cross-section valve body main portion and two sleeve portions connected directly or indirectly to form the valve body structure. Specifically, the valve body main portion is directly manufactured from a stainless steel profile, which is relatively inexpensive. A hole is then formed in the first plate-like portion, into which the valve seat is inserted and secured. The valve seat itself can be machined to an appropriate thickness, while the valve body main portion is manufactured from a profile, which provides high compressive strength.

[0051] The following combination Figures 15-19 Other embodiments of the connecting rod structure of the present invention are described. It should be noted that the connecting rod structure described in the following embodiments can be applied to the valve body structures provided in the first to fifth embodiments, but is not limited to the valve body structures of the above embodiments. Those skilled in the art should understand that the derivative embodiments based on the above embodiments are also suitable for the following embodiments.

[0052] Please refer to Figure 15-19 ,in, Figure 15 is a cross-sectional view of a main valve of an electromagnetic four-way valve provided by a sixth embodiment of the present invention; Figure 16 is a front view of the piston-connecting rod assembly structure provided by the sixth embodiment of the present invention; Figure 17 A schematic structural diagram of a connecting rod before assembly provided by a sixth embodiment of the present invention; Figure 18 A schematic perspective view of the structure of a piston-connecting rod assembly according to a sixth embodiment of the present invention; Figure 19 A cross-sectional view of a valve body according to a sixth embodiment of the present invention.

[0053] The electromagnetic switching valve of this embodiment is a four-way valve used to switch the flow direction of the refrigerant in the refrigeration system. Figure 15As shown, the solenoid switching valve includes a valve body 1, which can be made of metal such as stainless steel. In this embodiment, the valve body 1 comprises a valve body main portion 11, a first sleeve portion 12, and a second sleeve portion 13. The valve body main portion 11 is made of stainless steel sheet material. Specifically, it can be formed by cutting a section of a square-cross-section stainless steel profile, or by bending stainless steel sheets and then fixing them together. The valve body main portion 11 includes a first plate-shaped portion 111 and a surrounding portion 112. The first plate-shaped portion 111 represents one face of a tetrahedron, and the surrounding portion 112 represents the remaining three faces of the tetrahedron. Of course, the surrounding portion 112 is not limited to three faces and can also be curved as a whole, or it can include a second plate-shaped portion as described in the first embodiment. The valve body main portion 11 is provided with a first interface portion 1121 for fixed connection to the first connecting pipe 31. Specifically, a flange protruding toward the outside of the valve body main portion is formed on one wall of the surrounding portion 112 to facilitate fixing to the first connecting pipe 31. The first plate-shaped portion 111 is provided with three second interface portions 1122, which are respectively used to be fixedly connected to the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34. The first interface portion 1121 is arranged opposite to the three second interface portions 1122. It should be noted that this embodiment is a four-way valve, so the number of the second interface portions 1122 is set to 3, while in other applications, such as a three-way valve, only 2 second interface portions can be set. Inside the main body of the valve body 11, a valve seat 2 is fixedly connected to the inner side of the first plate-shaped portion 111. The valve seat 2 is generally plate-shaped and is provided with a through hole portion 21 corresponding one-to-one to the second interface portion 1122. The valve seat 2 and the main body of the valve body 11 can be fixedly connected to form an integral structure by welding, or they can be fixed by bonding. The two ends of the valve body main body 11 are respectively connected to a first sleeve portion 12 and a second sleeve portion 13 in a cylindrical shape. The first sleeve portion 12 and the second sleeve portion 13 are both open cylindrical shapes with one end closed. The first sleeve portion 12 is fixedly connected to one end of the valve body main body 11 through a first connecting member 71, and the second sleeve portion 13 is fixedly connected to the other end of the valve body main body 11 through a second connecting member 72.

[0054] Inside the valve body 1, there are provided a slider 6, a piston assembly and a connecting rod 5, wherein the piston assembly includes a first piston 41 and a second piston 42. The first piston 41 and the second piston 42 are fixedly connected to the two ends of the connecting rod 5, respectively. Specifically, the connecting rod 5 is generally in a plate-like structure, including a connecting rod body 59. The connecting rod body 59 is provided with a through-hole portion 56, and the through-hole portion 56 is used to fit with the slider 6, that is, the connecting rod 5 is snapped onto the slider 6 through the through-hole portion 56, so that the slider 6 and the connecting rod 5 can move synchronously. The connecting rod 5 includes a first end 52 and a second end 53, wherein the first end 52 forms a first end connecting portion 521 and a first end connecting portion 522 bent in different directions. Specifically, the first end connecting portion 521 and the first end connecting portion 522 can be bent in a direction perpendicular to the plate surface of the connecting rod body 59 and in opposite directions, so that the first end connecting portion 521 extends in one direction perpendicular to the connecting rod body 59, and the first end connecting portion 522 extends in another direction perpendicular to the connecting rod body 59. Both the first end connecting portion 521 and the first end connecting portion 522 are provided with connecting holes, and accordingly, the first piston 41 is also provided with connecting holes at corresponding positions, so that the first piston 41 can be fixedly connected to the first piston 521 by means of rivet connection. Figure 18 As shown, the first piston 41 itself is composed of parts such as a piston bowl, a piston gasket, and a pressure ring, and is fixed by riveting with a pair of first rivets 573. The first piston 41 and the connecting rod are fixed by riveting with a pair of second rivets 571. On the other side of the connecting rod, the second piston 42 itself is fixed by riveting with a third rivet 583, and the second piston 42 and the connecting rod are fixed by riveting with a pair of fourth rivets 581 / 582. The advantage of this arrangement is that the connecting rod has better strength when fixedly connected to the piston described below, and the force is relatively uniform. Those skilled in the art will understand that the second end 53 of the connecting rod is also provided with a second end connecting portion 531 and a second end connecting portion 532, and its structure and connection method can be the same as the connection method of the first end 52, which will not be repeated here. In this way, the first piston 41 is fixedly connected to one end of the connecting rod, and the second piston 42 is fixedly connected to the other end of the connecting rod.

[0055] When assembled, the first piston 41 slides with the inner wall of the first sleeve portion 12, and the second piston 42 slides with the inner wall of the second sleeve portion 13. The piston and the sleeve form a kinematic pair, thereby isolating the internal space of the sleeve.

[0056] At least one extension 51 is provided on both sides of the connecting rod body 59. In this embodiment, the extension 51 extends outward from one side of the connecting rod body 59. The "outward" referred to here means extending outward relative to the connecting rod body 59, with the connecting rod body as the reference. Since the connecting rod body is generally symmetrical and has a centerline S, the maximum distance between the extension 51 and the centerline S is L. Since the connecting rod is coaxial with the first sleeve portion and the second sleeve portion, L is greater than the radius D / 2 of any sleeve portion, where D is the diameter of the sleeve portion. Figure 15 shown.

[0057] Since L>D / 2, when the connecting rod moves to the left, the extension portion 51 of the connecting rod cannot enter the inner cavity of the first sleeve portion 12 of the electromagnetic switching valve after assembly, thereby achieving the positioning of the connecting rod stroke. Obviously, when the connecting rod moves to the right, the extension portion 51 of the connecting rod cannot enter the inner cavity of the second sleeve portion 12, thereby also achieving positioning. In other words, with the cross section perpendicular to the central axis of the first sleeve portion 12 as a reference, the projection of the extension portion 51 on the cross section has an overlapping portion with the projection of the first sleeve portion 12 on the cross section. Specifically, the extension portion 51 includes a limiting portion 54, which is formed at both ends of the extension portion 51 in the longitudinal direction, and the limiting portion 54 is used to abut against the end of the opening side of the first sleeve portion 12.

[0058] It should be noted that, in this embodiment, an extension portion 51 is extended from one side of the connecting rod body 59. Of course, two extension portions can also be extended from the same side, one for positioning with the first sleeve portion 12 and the other for positioning with the second sleeve portion 13. In addition, in theory, only one extension portion needs to be provided on one side of the connecting rod body 59. In order to facilitate processing and manufacturing and increase the strength of the connecting rod, extension portions can be provided on both sides of the connecting rod body 59, such as the corresponding one in this embodiment. Figure 16 shown.

[0059] As described above, in this embodiment, the first sleeve portion 12 is fixedly connected to one end of the valve body main portion 11 via the first connector 71, and the second sleeve portion 13 is fixedly connected to the other end of the valve body main portion 11 via the second connector 72. Specifically, the first connector 71 is used to connect the first sleeve portion 12 and the valve body main portion 11, while the second connector 72 is used to connect the second sleeve portion 13 and the valve body main portion 11. In a specific embodiment, the first and second connectors 71 and 72 are generally plate-shaped. The first connector 71 includes a first connector portion 711 and a second connector portion 722. The first connector portion 711 is fixedly connected to one end of the valve body main portion, while the second connector portion 712 is fixedly connected to one end of the first sleeve portion 12. Specifically, the connector portions have through-holes internally for welding to the second sleeve portion, and are externally welded to the valve body main portion 11, specifically by laser welding or other methods. Similarly, the second connector 72 can employ the same structure as the first connector 71, and will not be further described here.

[0060] When the valve body includes the first connecting member, with a cross section perpendicular to the central axis of the first sleeve portion as a reference, the projection of the extension portion 51 on the cross section overlaps with the projection of the first sleeve portion on the cross section, and the projection of the extension portion 51 on the cross section overlaps with the projection of the first connecting member 71 on the cross section. In this way, when the connecting rod moves to the left to a specific position, the extension portion 51 of the connecting rod can abut against the first sleeve portion 12 to achieve a stop, can also abut against the first connecting member 71 to achieve a stop, or can abut against the first sleeve portion 12 and the first connecting member 71 to achieve a stop at the same time, as shown in FIG. Figure 19 Specifically, the extension portion 51 includes a limiting portion 54 formed at both ends of the extension portion 51 in the longitudinal direction, and the limiting portion 54 can abut against the first sleeve portion 12 and / or the first connecting member 71 .

[0061] The extension portion 51 can be made of a separate component and fixed to the connecting rod body portion 59 by welding or other means, or it can be integrally formed with the connecting rod body portion 59. Specifically, in this embodiment, the extension portion extends from the connecting rod body portion 59 in a direction away from the centerline S of the connecting rod. The extension portion 51 and the connecting rod body portion 59 are made of a single piece of material. During processing, a portion of the connecting rod body portion 59 can be directly formed into the extension portion 51. When the extension portion 51 is an integral structure, its length is less than or equal to the length of the valve body main portion 111. It should be noted that when the length of the extension portion is equal to the length of the valve body main portion, the valve body main portion can be connected to the two sleeve portions after transition through other components with a certain length in the transverse direction.

[0062] The connecting rod 5 is provided with a through hole, which is engaged with the slider 6 to limit the position. In this way, when the connecting rod 5 moves in the left and right directions, it can drive the slider 6 to move together. The slider 6 is a roughly inverted bowl-shaped structure. Figure 15 In the position shown, the inner cavity of the slider 6 connects the spaces within the second connecting pipe 32 and the third connecting pipe 33. When the slider 6 moves rightward to a preset position, the inner cavity of the slider 6 connects the spaces within the third connecting pipe 33 and the fourth connecting pipe 34. The first piston 41 can slide along the inner wall of the first sleeve portion 12, and the second piston 42 can slide along the inner wall of the second sleeve portion 13. In this way, the piston assembly divides the valve chamber into a first valve chamber 411, a second valve chamber 412, and a third valve chamber 413. When the pressures between the valve chambers differ, generating a pressure differential force, this pressure differential force can drive the piston assembly, connecting rod, and slider to move, thereby connecting the internal spaces of the second connecting pipe 32 and the third connecting pipe 33, or connecting the internal spaces of the third connecting pipe 33 and the fourth connecting pipe 34. The piston assembly, connecting rod and slider are positioned to the left by the abutment of the extension part of the connecting rod with the first sleeve part and / or the first connecting member, and the piston assembly, connecting rod and slider are positioned to the right by the abutment of the extension part of the connecting rod with the second sleeve part and / or the second connecting member.

[0063] The advantage of this positioning method is that it does not rely on the positioning of the piston component, but directly utilizes the connecting rod for positioning, which is more conducive to ensuring more accurate positioning. Because positioning using the piston component also requires considering the assembly dimensional chain errors of the piston, connecting rod, and slider, in this embodiment, positioning is independent of the piston assembly structure and only requires ensuring the relative position of the sleeve portion and the main body of the valve body, as well as the dimensions of the connecting rod extension, which reduces the dimensional chain requirements. In addition, the connecting rod extension is easier to process, which is conducive to mass production.

[0064] Here, the directional words up, down, left and right are defined based on the diagrams shown in the accompanying drawings of the specification, and are only for the convenience of understanding and expression, and should not limit the scope of protection of this application.

[0065] The above describes in detail the solenoid switching valve provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electromagnetic switching valve, characterized in that: The invention comprises a valve body (1), a piston assembly, a connecting rod (5), and a slider (6); the valve body (1) comprises a valve body main body (11), a first sleeve part (12), and a second sleeve part (13); the first sleeve part (12) is directly or indirectly fixedly connected to the valve body main body (11); the second sleeve part (13) is directly or indirectly fixedly connected to the valve body main body (11); the area enclosed by the longitudinal section of the first sleeve part (12) is smaller than the area enclosed by the longitudinal section of the valve body main body (11); the area enclosed by the longitudinal section of the second sleeve part (13) is smaller than the area enclosed by the longitudinal section of the valve body main body (11); the valve body main body (11) comprises a first plate-shaped part (111) and a surrounding part (112); the first plate-shaped part (111) and the surrounding part (112) are formed of an integral material, or the first plate-shaped part (111) and the surrounding part (112) are fixedly connected to form an integral structure; The connecting rod (5) is fixedly connected to the piston assembly, and the piston assembly includes a first piston (41) and a second piston (42). The first piston (41) is fixedly connected to one end of the connecting rod (5), and the second piston (42) is fixedly connected to the other end of the connecting rod (5). The first piston (41) is in sliding engagement with the inner wall of the first sleeve portion (12), and the second piston (42) is in sliding engagement with the inner wall of the second sleeve portion (13). The connecting rod (5) includes at least one extension portion (51), and the maximum distance from the extension portion (51) to the center line of the connecting rod is greater than the radius of the first sleeve portion (12) or the second sleeve portion (13).

2. The electromagnetic switching valve according to claim 1, wherein: Taking a cross section perpendicular to the central axis of the first sleeve portion (12) as a reference, a projection of the extension portion (51) on the cross section overlaps with a projection of the first sleeve portion (12) on the cross section.

3. The electromagnetic switching valve according to claim 1 or 2, characterized in that: The extension portion (51) extends from the main body of the connecting rod (5) in a direction away from the center line of the connecting rod, the extension portion (51) and the connecting rod (5) are made of a single piece of material, or the extension portion (51) is fixedly connected to the connecting rod (5), and the length of the extension portion (51) is less than or equal to the length of the main body (111) of the valve body.

4. The electromagnetic switching valve according to claim 1 or 2, characterized in that: The extending portion (51) includes a limiting portion (54), and the limiting portion (54) is capable of abutting against the end of the first sleeve portion (12).

5. The electromagnetic switching valve according to claim 1 or 2, characterized in that: The valve body (1) includes at least a first connecting member (71), the first connecting member (71) including a first connecting portion (711) and a second connecting portion (722), the first connecting portion (711) being fixedly connected to one end of the valve body main body (11), and the second connecting portion (712) being fixedly connected to one end of the first sleeve portion (12).

6. The electromagnetic switching valve according to claim 5, characterized in that: Taking a cross section perpendicular to the central axis of the first sleeve portion (12) as a reference, a projection of the extension portion (51) on the cross section overlaps with a projection of the first sleeve portion (12) on the cross section, and a projection of the extension portion (51) on the cross section overlaps with a projection of the first connecting member (71) on the cross section.

7. The electromagnetic switching valve according to claim 6, wherein: The extending portion (51) includes a limiting portion (54), and the limiting portion (54) is capable of abutting against the first sleeve portion (12) and / or the first connecting member (71).

8. The electromagnetic switching valve according to claim 1, wherein: The valve body (1) includes a first interface portion (1121) and at least two second interface portions (1122), wherein the first interface portion (1121) is arranged on the surrounding portion (112), and the at least two second interface portions (1122) are arranged on the first plate-shaped portion (111), and the first interface portion (1121) and the at least two second interface portions (1122) are arranged opposite to each other.

9. The electromagnetic switching valve according to claim 8, characterized in that: The valve body main body (11) is made of an integrally molded material, or the valve body main body (11) is a plate that is rolled and welded into an integral structure, the surrounding portion (112) includes at least one second plate-shaped portion (1123), and the first interface portion (1121) is located on the second plate-shaped portion (1123).

10. The electromagnetic switching valve according to any one of claims 1 to 2, characterized in that: The valve body (1) further comprises a third flat portion (1111), the third flat portion (1111) being located outside the valve body main portion (11), the third flat portion (1111) being fixedly connected to the valve body main portion (11), and the third flat portion (1111) at least partially covering the first plate-shaped portion (111).

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