CN114838181A - Electromagnetic switching valve - Google Patents

Abstract

An electromagnetic switching valve is characterized by comprising a valve body, a piston assembly, a connecting rod and a sliding block, wherein the valve body comprises a valve body main body part, a first sleeve part and a second sleeve part, the connecting rod is fixedly connected with the piston assembly, the piston assembly comprises a first piston and a second piston, the first piston is fixedly connected with one end part of the connecting rod, the second piston is fixedly connected with the other end part of the connecting rod, the first piston is in sliding fit with the inner wall of the first sleeve part, and the second piston is in sliding fit with the inner wall of the second sleeve part; the connecting rod includes at least one extension having a maximum distance from a centerline of the connecting rod that is greater than a radius of the first sleeve portion or the second sleeve portion.

Description

Electromagnetic switching valve

Technical Field

The invention relates to the field of refrigeration control, in particular to an electromagnetic switching valve.

Background

The electromagnetic switching valve is applied to a refrigeration system, and is generally used for switching a refrigerant flow path to change the flow direction of refrigerant. Such as a four-way solenoid valve, a three-way solenoid valve, etc. The description will be given by taking the solenoid four-way valve as an example. Referring to fig. 1 and 2, fig. 1 is a schematic diagram illustrating a typical solenoid four-way valve used in a refrigeration system in the prior art, and fig. 2 is a longitudinal sectional view illustrating a main valve of the solenoid four-way valve in the prior art.

As shown, a conventional four-way solenoid valve, which is generally used in a refrigeration system such as an air conditioning system, includes a main valve 10 'and a pilot valve 20'; the main valve 10 'comprises a valve body 11'. The valve body 11' is substantially cylindrical, and has a D port formed on a peripheral wall thereof for connecting the exhaust pipe D, and a valve seat 13' fixedly connected to the peripheral wall on a side opposite to the D port, and the valve seat 13' has 3 holes respectively for fixedly connecting the connection pipe E, the suction pipe S, and the connection pipe C. Because the cross-section of the valve body 11' is circular, the valve seat 13' is provided with an arc-shaped surface matched with the inner wall of the main valve body, namely the longitudinal section of the valve seat 13' is as large as D-shaped, and the valve seat and the main valve body are fixed by welding.

The valve body 11' is connected with an exhaust pipe D (connected with a high pressure region) connected with an exhaust port of the compressor, an air suction pipe S (connected with a low pressure region) connected with an air suction port of the compressor, a connection pipe E connected with the indoor heat exchanger 30' and a connection pipe C connected with the outdoor heat exchanger 40 '; the two ends of the valve body 11' are provided with end covers 12', the interior of the valve body is fixedly provided with a valve seat 13', the valve seat 13' is also provided with a slide block 15' and a piston 16' which are driven by a connecting rod 14', the valve seat 13' contacts and supports the slide block 15' to form a pair of kinematic pairs, and the piston 16' and the valve body 11' form a pair of kinematic pairs.

The small valve body of the pilot valve 20' is fixedly provided with a capillary tube D connected with the exhaust pipe D of the main valve 10', namely, the inner cavity of the pilot valve 20' is correspondingly communicated with the high-pressure area of the main valve; the small valve seat of the pilot valve 20' is provided with three valve ports, and a capillary tube e, a capillary tube S and a capillary tube c which are connected with the left end cover of the main valve 10', the air suction pipe S and the right end cover of the main valve 10' are fixedly arranged from left to right; the right end of the small valve body of the pilot valve 20 'is fixedly provided with a sleeve, and the outer side of the sleeve is provided with an electromagnetic coil 50'.

In an operating state, when the refrigeration system needs to refrigerate, the electromagnetic coil 50 'is not energized, the core iron in the cavity of the pilot valve 20' drives the sliding bowl to be located at the left side under the action of the restoring spring force, so that the capillary E is communicated with the capillary S, the capillary C is communicated with the capillary D, the left cavity of the main valve 10 'is a low-pressure area, the right cavity is a high-pressure area, the pressure difference force formed between the left cavity and the right cavity of the main valve 10' pushes the sliding block 15 'and the piston 16' to the left side, so that the connecting pipe E is communicated with the suction pipe S, the exhaust pipe D is communicated with the connecting pipe C, and at this time, the flow path of a refrigerant in the refrigeration system is: compressor discharge port → discharge pipe D → valve cavity of valve body 11 → connection pipe C → outdoor heat exchanger 40'→ throttling element 60' → indoor heat exchanger 30'→ connection pipe E → slide block 15' inner cavity → suction pipe S → compressor suction port, the refrigeration system is in the refrigeration working state;

when the refrigeration system needs to heat, the electromagnetic coil 50 'is powered on, the core iron in the cavity of the pilot valve 20' overcomes the acting force of the return spring to drive the sliding bowl to move right, so that the capillary C is communicated with the capillary S, the capillary E is communicated with the capillary D, the left cavity of the main valve 10 'is a high-pressure area, the right cavity is a low-pressure area, a pressure difference is formed between the left cavity and the right cavity of the main valve 10', the sliding block 15 'and the piston 16' are pushed to the right side, the connecting pipe C is communicated with the suction pipe S, the exhaust pipe D is communicated with the connecting pipe E, and at the moment, the flow path of a refrigerant in the refrigeration system is as follows: compressor discharge port → discharge pipe D → valve cavity of valve body 11 → connection pipe E → indoor heat exchanger 30'→ throttling element 60' → outdoor heat exchanger 40'→ connection pipe C → inner cavity of slide block 15' → suction pipe S → compressor suction port, and the refrigeration system is in a heating operation state.

As described above, the main valve 10' can be switched by the cooperation of the pilot valve 20' and the solenoid coil 50', and the like, so that the flow direction of the refrigerant can be switched, and the heating operation state and the cooling operation state of the refrigeration system can be switched.

Disclosure of Invention

It is an object of one embodiment of the present invention to provide an electromagnetic switching valve in which the piston rod is relatively accurately positioned. For this reason, at least one embodiment of the present invention employs the following technical solutions:

an electromagnetic switching valve is characterized by comprising a valve body, a piston assembly, a connecting rod and a sliding block, wherein the valve body comprises a valve body main body part, a first sleeve part and a second sleeve part, the first sleeve part is directly or indirectly fixedly connected with the valve body main body part, the second sleeve part is directly or indirectly fixedly connected with the valve body main body part, the area surrounded by the longitudinal section of the first sleeve part is smaller than the area surrounded by the longitudinal section of the valve body main body part, and the area surrounded by the longitudinal section of the second sleeve part is smaller than the area surrounded by the longitudinal section of the valve body main body part; the valve body main body part comprises a first plate-shaped part and a surrounding part, wherein the first plate-shaped part and the surrounding part are integrally formed by materials, or the first plate-shaped part and the surrounding part are fixedly connected into an integral structure;

the connecting rod is fixedly connected with the piston assembly, the piston assembly comprises a first piston and a second piston, the first piston is fixedly connected with one end of the connecting rod, the second piston is fixedly connected with the other end of the connecting rod, the first piston is in sliding fit with the inner wall of the first sleeve part, and the second piston is in sliding fit with the inner wall of the second sleeve part; the connecting rod includes at least one extension having a maximum distance to a centerline of the connecting rod that is greater than a radius of the first sleeve section or the second sleeve section.

According to the electromagnetic switching valve adopted by the embodiment, the valve body adopts a combined structure of the valve body main body part and the sleeve part, the extending part is arranged on the connecting rod and abutted against the valve body to realize positioning, and the positioning is relatively accurate.

Drawings

FIG. 1 is a schematic structural diagram of a solenoid four-way valve used in a refrigeration system in the prior art;

FIG. 2 is a longitudinal sectional view of a main valve of a solenoid four-way valve according to the background art;

fig. 3 is an external view of the electromagnetic switching valve according to the first embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a main valve of an electromagnetic switching valve according to a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a main body of a valve body according to a first embodiment of the present invention;

FIG. 6 is a sectional view of the valve body and valve seat and slider structure provided in accordance with the first embodiment of the present invention;

FIG. 7 is a schematic structural view of a valve body according to a second embodiment of the present invention before being machined;

FIG. 8 is a schematic structural diagram of a valve body, a valve seat and a slider according to a third embodiment of the present invention;

FIG. 9 is a cross-sectional view of a valve body and valve seat and slider configuration provided in accordance with a third embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a valve body, a valve seat and a slider according to a fourth embodiment of the present invention;

FIG. 11 is a cross-sectional view of a valve body and valve seat and slider configuration provided in accordance with a fourth embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a valve body, a valve seat and a slider according to a fifth embodiment of the present invention;

FIG. 13 is a cross-sectional view of a valve body and seat and slider configuration provided in accordance with a fifth embodiment of the present invention;

FIG. 14 is a cross-sectional view of a valve body and valve seat and slider configuration provided in accordance with yet another embodiment of the present invention;

FIG. 15 is a cross-sectional view of a main valve of a solenoid four-way valve according to a sixth embodiment of the present invention;

FIG. 16 is an elevational view of the piston and connecting rod assembly in accordance with the sixth embodiment of the present invention;

FIG. 17 is a schematic structural view of a connecting rod according to a sixth embodiment of the present invention before assembly;

FIG. 18 is a perspective view of a piston and connecting rod assembly in accordance with a sixth embodiment of the present invention;

fig. 19 is a sectional view of a valve body according to a sixth embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description is made with reference to the accompanying drawings and the detailed description.

Referring to fig. 3 and 4, fig. 3 is an external schematic view of an electromagnetic switching valve according to a first embodiment of the present invention; fig. 4 is a schematic cross-sectional view of a main valve of an electromagnetic switching valve according to a first embodiment of the present invention.

The electromagnetic switching valve of the embodiment is a four-way valve, and is used for switching the flowing direction of a refrigerant in a refrigeration system. As shown in fig. 3 and 4, the electromagnetic switching valve includes a valve body 1, the valve body 1 may be machined from a metal such as stainless steel, and in the present embodiment, the valve body 1 includes a valve body 11, a first sleeve portion 12, and a second sleeve portion 13. The valve body 11 is made of a stainless steel plate, specifically, a stainless steel profile with a square cross section may be cut and processed into one section, and the valve body 11 includes a first plate 111 and a surrounding part 112, where the first plate 111 is one surface of a tetrahedron, and the surrounding part 112 is the other three surfaces of the tetrahedron. The valve body 11 is provided with a first connecting part 1121 for fixedly connecting with the first connecting pipe 31, and specifically, a flange protruding toward the outside of the valve body is formed on one wall of the surrounding part 112 to facilitate fixing with the first connecting pipe 31. The first plate-shaped portion 111 is opened with three second connecting ports 1122 for fixedly connecting to the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34, respectively. First interface portion 1121 is provided opposite to 3 second interface portions 1122. It should be noted that, the present embodiment is a four-way valve, so the number of the second interface 1122 is set to 3, and in other applications, such as a three-way valve, only 2 second interfaces may be provided. The valve seat 2 is fixedly connected to the inside of the first plate-shaped portion 111 in the valve body 11, the valve seat 2 is substantially plate-shaped and is provided with through-hole portions 21 corresponding to the second connecting portions 1122 one by one, and the valve seat 2 and the valve body 11 may be fixedly connected to each other by welding or may be fixed by bonding.

The valve body 11 has a first sleeve part 12 and a second sleeve part 13 connected to opposite ends thereof, the first sleeve part 12 and the second sleeve part 13 each having an open tubular shape with one end closed, the first sleeve part 12 being fixedly connected to one end of the valve body 11 by a first connector 71, and the second sleeve part 13 being fixedly connected to the other end of the valve body 11 by a second connector 72. Of course, it will be understood by those skilled in the art that the first and second connecting members are for more conveniently connecting the sleeve portion to the valve body portion, since the valve body portion has a structure of at least one plate-shaped portion having a cross section of a rectangular, square, trapezoidal or other irregular shape, and the sleeve portion has a generally circular cross section, so that the connection can be conveniently performed using the connecting members. However, in the case where a connecting member is not used, the open end of the sleeve portion may be drawn out to a shape corresponding to the cross-sectional profile of the valve body main body portion, so that the open end of the sleeve portion and the open end of the valve body main body portion are directly fixed by, for example, welding without using the connecting member.

Thus, the valve body main body 11, the first sleeve portion 12, and the second sleeve portion 13 substantially enclose a valve chamber, and the refrigerant in the valve chamber 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 only necessary to ensure that the first sleeve part 12 and the second sleeve part 13 are coaxial, and no special limitation is required between the first sleeve part 12 or the second sleeve part 13 and the valve body main part 11, and it is only necessary to satisfy that after the piston connecting rod assembly and the sliding block are assembled, the sliding block can be ensured to slide on the valve body main part or the valve seat, and the piston member can move in the inner cavities of the first sleeve part and the second sleeve part.

Inside the valve body 1, a slider 6, a piston assembly including a first piston 41 and a second piston 42, and a connecting rod 5 are provided. 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 is provided with a through hole which is clamped and limited with the sliding block 6, so that the sliding block 6 can be driven to move together when the connecting rod 5 moves in the left and right directions. The slide block 6 is of a substantially inverted bowl-shaped structure, and in the position shown in fig. 4, the inner cavity of the slide block 6 communicates the space in the second connecting pipe 32 with the space in the third connecting pipe 33, and when the slide block 6 moves to the right to a preset position, the inner cavity of the slide block 6 can communicate the space in the third connecting pipe 33 with the space in the fourth connecting pipe 34. The first piston 41 can slide along the inner wall of the first sleeve part 12, and the second piston 42 can slide along the inner wall of the second sleeve part 13, so that the piston assembly divides the valve cavity into a first valve cavity 411, a second valve cavity 412, and a third valve cavity 413, and when pressure difference is generated due to different pressures between the valve cavities, the pressure difference can push the piston assembly, the connecting rod, and the slider to displace, so that the inner space of the second connecting pipe 32 and the third connecting pipe 33 can be communicated, or the inner space of the third connecting pipe 33 and the fourth connecting pipe 34 can be communicated. In order to determine the stroke of the piston assembly, the connecting rod and the slider moving leftward and rightward, a limit structure is required to be provided to position the piston assembly, the connecting rod and the slider moving leftward and rightward, in this embodiment, one first limit portion 121 is 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 the bottom wall thereof is protruded inward by rolling, and when the first piston 41 moves leftward, the first piston can be abutted against the first limit portion 121 to position. Similarly, a second stopper 131 may be formed by rolling and protruding inward from an outer peripheral wall of the second sleeve portion 13 on a side close to the bottom wall thereof, and when the second piston 42 moves rightward, the second stopper 131 may be abutted to achieve positioning.

Of course, in addition to this embodiment, the first sleeve portion 12 and the second sleeve portion 13 may be configured to have different diameters, and the opening side thereof, that is, the inner diameter of the portion that fits the piston bowl is larger than the inner diameter of the closed side of the sleeve portion, so that a stopper portion is formed between the two different inner diameters.

Referring to fig. 5 and 6, in which fig. 5 is a schematic structural view of a main body of a valve body according to a first embodiment of the present invention; fig. 6 is a sectional view of the valve body, valve seat and slider structure according to the first embodiment of the present invention.

In the present embodiment, the valve body main body 11 is integrally formed of a stainless steel material, specifically, one section of the stainless steel pipe with a square cross section may be taken, and the valve body main body 11 includes the first plate-shaped portion 111 and the surrounding portion 112, and in the present embodiment, the surrounding portion 112 is three surfaces except for the first plate-shaped portion 111. Three second connecting parts 1122 are formed in the first plate-like part 111, and a first connecting part 1121 is formed at a position facing the first plate-like part 111 in the surrounding part 112. In the present embodiment, the surrounding portion 112 further includes a second plate-like portion 1123, the second plate-like portion 1123 is disposed opposite to the first plate-like portion 111, and the first interface portion 1121 is located at the second plate-like portion 1123. The second plate-like portion 1123 may have a flat plate-like structure or a curved plate-like structure. The valve seat 2 has a plate-like structure and has through-hole portions 21, and the number and positions of the through-hole portions 21 correspond to those of the second connecting port portion 1122. The valve seat 2 is fixedly connected to the inner side of the first plate-shaped portion 111, specifically, the valve seat may be fixed by laser welding or by gluing.

As a further embodiment, it is also possible to project at least a part of the second plate-like portion 1123 toward the direction of the first interface portion 1121, and the first interface portion 1121 is provided to the projected part of the second plate-like portion 1123. A portion of the second plate-shaped portion 1123 may be protruded upward, as shown in fig. 14, and fig. 14 is a sectional view of a valve body main body portion, a valve seat, and a slider structure according to still another embodiment of the present invention. The second plate-like portion 1123 protrudes upward to form a top protrusion 11231, and the first connecting portion 1121 is disposed at the top protrusion 11231. Of course, the second plate-like portion 1123 may be formed in an upwardly convex curved surface shape as a whole. This arrangement has the advantage that the distance between the first connecting part 1121 and the first plate-shaped part 111 is relatively longer, or after the slider and the connecting rod are assembled, the first connecting part 1121 is relatively longer than the top wall of the slider, so that when the high-pressure refrigerant flows in from the first connecting pipe 31, there is a relatively larger space, which is beneficial to optimizing the flow rate on the high-pressure side. It should be noted that the protrusion structure of the second plate-shaped portion 1123 is also applicable to the second, third, fourth, and fifth embodiments described below, and is not described in detail.

The valve body structure that this implementation was turned over and was provided adopts the cross-section to be square valve body main part and two sleeve parts and connects into the valve body structure through direct or indirect mode, and especially the valve body main part directly adopts stainless steel section bar to make, and the cost is comparatively cheap relatively. Moreover, the first plate-shaped part is substantially plate-shaped, and the valve seat is also plate-shaped, so that welding and fixing can be conveniently carried out, the valve seat with the D-shaped longitudinal section is not processed as in the background technology, and the valve seat is matched with the arc-shaped surface of the inner wall of the arc-shaped main valve body, so that a large amount of material cost and processing cost can be relatively saved.

Referring to fig. 7, fig. 7 is a schematic structural view of a valve body according to a second embodiment of the present invention before processing. The present embodiment differs from the first embodiment in that the valve body main body 11 is formed by crimping a stainless steel sheet, instead of a stainless steel pipe having a square cross section that is prefabricated. Specifically, the stainless steel plate 110 is prefabricated, then 4 holes are punched in the plate, and then the 4 holes are flanged to form the first connecting portion 1121 and the 3 second connecting portions 1122, and then the stainless steel plate 110 is bent to form a square, and is fixed at the seam by welding. It will be understood by those skilled in the art that, in the present embodiment, as in the first embodiment, a second plate-like portion 1123 may be provided on the surrounding portion 112, the second plate-like portion 1123 being provided opposite to the first plate-like portion 111, and the first connecting portion 1121 may be located at the second plate-like portion 1123.

This implement to the valve body structure that provides adopts the mode processing that the stainless steel sheet material was rolled up and is rolled over, in actual course of working, can punch the hole earlier and carry out the turn-ups on the panel, and the roll is rolled over again and is become squarely, and the processing cost is comparatively cheap relatively. Moreover, the first plate-shaped part is substantially plate-shaped, and the valve seat is also plate-shaped, so that welding and fixing can be conveniently carried out, the valve seat with the D-shaped longitudinal section is not processed as in the background technology, and the valve seat is matched with the arc-shaped surface of the inner wall of the arc-shaped main valve body, so that a large amount of material cost and processing cost can be relatively saved.

Referring to fig. 8 and 9, fig. 8 is a schematic structural diagram of a valve body, a valve seat, and a slider according to a third embodiment of the present invention; fig. 9 is a sectional view of a valve body, a valve seat, and a slider structure according to a third embodiment of the present invention. The present embodiment is different from the first embodiment in that the valve body main body 11 is made of a relatively thicker material, and the inner side surface of the first plate-like portion 111 is directly used as a mating surface for the slider 6, that is, a separate valve seat member is not provided, but the first plate-like portion 111 simultaneously performs a valve seat function, and the slider 6 directly slides on the inner side surface of the first plate-like portion 111.

The valve body structure that this implementation was turned over and was provided adopts the cross-section to be square valve body main part and two sleeve parts and connects into the valve body structure through direct or indirect mode, and especially the valve body main part directly adopts stainless steel section bar to make, and thickness is bigger than first embodiment for the valve body has higher pressure resistance. Moreover, because the thickness is relatively thick, the first plate-shaped part of the valve body main body part can directly assume the function of the valve seat without providing a separate valve seat structure, namely, after the surface processing treatment, the slide block directly slides on the inner side surface of the first plate-shaped part to realize the switching function. The structure of the structure is relatively simpler, and the mass production is convenient. Moreover, the first plate-shaped part is substantially plate-shaped, and the valve seat is also plate-shaped, so that welding and fixing can be conveniently carried out, the valve seat with the D-shaped longitudinal section is not processed as in the background technology, and the valve seat is matched with the arc-shaped surface of the inner wall of the arc-shaped main valve body, so that a large amount of material cost and processing cost can be relatively saved.

Referring to fig. 10 and 11, fig. 10 is a schematic structural diagram of a valve body, a valve seat, and a slider according to a fourth embodiment of the present invention; fig. 11 is a sectional view of a valve body, a valve seat, and a slider according to a fourth embodiment of the present invention. The difference between this embodiment and the first embodiment is that the valve body 11 is a split structure, that is, the first plate-shaped portion 111 and the surrounding portion 112 are separately processed parts, so that the first plate-shaped portion 111 can be made of a relatively thicker stainless steel plate, and three second connecting ports 1122 are processed for fixedly connecting with the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34 of the four-way valve, and the inner side surface of the first plate-shaped portion 111 is used for cooperating with the slider 6.

This implementation falls the valve body structure who provides, first platelike portion adopt solitary part machine-shaping, can select suitable thickness to surface machining is fit for mass production, and guarantees the sliding fit that its surface is fit for the slider relatively easily. The surrounding part is formed by bending or curling the plate-shaped part, and the surface treatment of the surrounding part is not very strict, so that the method is favorable for mass production and processing, and can save the manufacturing cost. Similarly, in this embodiment, it is not necessary to process a valve seat with a D-shaped longitudinal section as described in the background art, and the valve seat is matched with the arc-shaped surface of the inner wall of the arc-shaped main valve body, so that a large amount of material cost and processing cost can be saved relatively.

Referring to fig. 12 and 13, fig. 12 is a schematic structural view of a valve body, a valve seat and a slider according to a fifth embodiment of the present invention; fig. 13 is a sectional view of a valve body, a valve seat, and a slider structure according to a fifth embodiment of the present invention. The valve body 11 is integrally formed by a stainless steel profile, and includes a first plate 111 and a surrounding part 112, wherein the first plate 111 is provided with a through-hole 1112, and the valve seat 2 is fitted in the hole 1112 and fixedly connected to the first plate 111 by welding. To further improve the reliability, the material thickness of the valve seat 2 may be set to be larger than the material thickness of the first plate-like portion 111, and the valve seat 2 may be protruded with respect to both the inner side surface of the first plate-like portion 111 and the outer side surface of the first plate-like portion 111 after being assembled with the first plate-like portion 111.

The valve body structure that this implementation was turned over and was provided adopts the cross-section to be square valve body main part and two sleeve parts and connects into the valve body structure through direct or indirect mode, and especially the valve body main part directly adopts stainless steel section bar to make, and the cost is comparatively cheap relatively. Then, a hole is formed in the first plate-shaped part, the valve seat is embedded, assembled and fixed, the valve seat can be machined by selecting a proper thickness, and the valve body main body part is made of a section bar and has high pressure resistance.

Other embodiments of the present invention relating to the link structure will be described below with reference to fig. 15 to 19. It should be noted that the connecting rod structure described in the following embodiments may be applied to the valve body structures provided in the first to fifth embodiments, but not limited to the valve body structure of the above embodiments, and those skilled in the art will understand that the derivative embodiments based on the above embodiments are also applicable to the following embodiments.

Referring to fig. 15-19, fig. 15 is a cross-sectional view of a main valve of a solenoid four-way valve according to a sixth embodiment of the present invention; FIG. 16 is an elevational view of the piston and connecting rod assembly in accordance with the sixth embodiment of the present invention; FIG. 17 is a schematic structural view of a connecting rod according to a sixth embodiment of the present invention before assembly; FIG. 18 is a perspective view of a piston and connecting rod assembly in accordance with a sixth embodiment of the present invention; fig. 19 is a sectional view of a valve body according to a sixth embodiment of the present invention.

The electromagnetic switching valve of the embodiment is a four-way valve and is used for switching the flowing direction of a refrigerant in a refrigerating system. As shown in fig. 15, the electromagnetic switching valve includes a valve body 1, the valve body 1 may be machined from metal such as stainless steel, and in the present embodiment, the valve body 1 includes a valve body main body 11, and a first sleeve portion 12 and a second sleeve portion 13. The valve body 11 is made of stainless steel plate, specifically, it can be made of stainless steel section with a square cross section by cutting one section of the section, or made of stainless steel plate by bending and then fixedly connecting. The valve body main body 11 includes a first plate-like portion 111 and a surrounding portion 112, wherein the first plate-like portion 111 is one of faces of a tetrahedron, and the surrounding portion 112 is the remaining three faces of the tetrahedron. Of course, the surrounding portion 112 is not limited to the three-sided enclosure, and may be entirely curved, or may include a second plate-like portion as described in the first embodiment. The valve body 11 is provided with a first connecting part 1121 for fixedly connecting with the first connecting pipe 31, and specifically, a flange protruding toward the outside of the valve body is formed on one wall of the surrounding part 112 to facilitate fixing with the first connecting pipe 31. The first plate-shaped portion 111 is opened with three second connecting ports 1122 for fixedly connecting to the second connecting pipe 32, the third connecting pipe 33, and the fourth connecting pipe 34, respectively. First interface portion 1121 is provided opposite to 3 second interface portions 1122. It should be noted that, the present embodiment is a four-way valve, so the number of the second interface 1122 is set to 3, and in other applications, such as a three-way valve, only 2 second interfaces may be provided. The valve seat 2 is fixedly connected to the inside of the first plate-shaped portion 111 in the valve body 11, the valve seat 2 is substantially plate-shaped and is provided with through-hole portions 21 corresponding to the second connecting portions 1122 one by one, and the valve seat 2 and the valve body 11 may be fixedly connected to each other by welding or may be fixed by bonding. The valve body 11 has a first sleeve part 12 and a second sleeve part 13 connected to opposite ends thereof, the first sleeve part 12 and the second sleeve part 13 each having an open tubular shape with one end closed, the first sleeve part 12 being fixedly connected to one end of the valve body 11 by a first connector 71, and the second sleeve part 13 being fixedly connected to the other end of the valve body 11 by a second connector 72.

Inside the valve body 1, a slider 6, a piston assembly including a first piston 41 and a second piston 42, and a connecting rod 5 are provided. The first piston 41 and the second piston 42 are fixedly connected to both ends of the connecting rod 5, respectively. Specifically, the link 5 has a substantially plate-like structure and includes a link body portion 59. The link body 59 is provided with a through hole 56, and the through hole 56 is used for snap fitting with the slider 6, that is, the link 5 is engaged with the slider 6 through the through hole 56, so that the slider 6 and the link 5 can move synchronously. The link 5 includes a first end portion 52 and a second end portion 53, wherein the first end portion 52 forms a first end connection first portion 521 and a first end connection second portion 522 bent toward different directions. Specifically, the first end connecting first portion 521 and the first end connecting second portion 522 may be bent in a direction perpendicular to the plate surface of the link body portion 59 and in opposite directions, such that the first end connecting first portion 521 extends in one direction perpendicular to the link body portion 59 and the first end connecting second portion 522 extends in the other direction perpendicular to the link body portion 59. The first end connecting first portion 521 and the first end connecting second portion 522 are respectively provided with a connecting hole, and correspondingly, the first piston 41 is also provided with a connecting hole at a corresponding position, so that the first piston 41 can be fixedly connected with the first end connecting first portion 521 by means of rivet connection. As shown in fig. 18, the first piston 41 itself is composed of parts such as a piston bowl, a piston washer, and a press ring, and is fixed by caulking using a pair of first caulking pieces 573. The first piston 41 and the connecting rod are riveted and fixed by a pair of second riveting parts 571. On the other side of the connecting rod, the second piston 42 itself is riveted by a third rivet 583, while the second piston 42 and the connecting rod are riveted by a pair of fourth rivets 581/582. The advantage of this arrangement is that the connecting rod is securely connected to the piston as described below with a relatively uniform force. Those skilled in the art will appreciate that the second end 53 of the connecting rod is also provided with a first end connecting portion 531 and a second end connecting portion 532, which may be similar to the first end 52 in structure and connection, and will not be described herein. Thus, 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.

When assembled, the first piston 41 is in sliding engagement with the inner wall of the first sleeve section 12 and the second piston 42 is in sliding engagement with the inner wall of the second sleeve section 13. A kinematic pair is formed between the piston and the sleeve, so that the inner space of the sleeve is isolated.

At least one extending portion 51 is disposed on both sides of the link body portion 59, in the present embodiment, the extending portion 51 extends outward from one side portion of the link body portion 59, and the term "outward" as used herein refers to an outward extension relative to the link body portion 59, and since the link body portion is substantially symmetrical and has a center line S, the maximum distance from the extending portion 51 to the center line S is L. Since the connecting rod is disposed coaxially with both the first sleeve section and the second sleeve section, L is greater than the radius D/2 of either sleeve section, where D is the diameter of the sleeve section, as shown in fig. 15.

Since L is larger than D/2, when the connecting rod moves leftwards, the extension part 51 of the connecting rod can not enter the inner cavity of the first sleeve barrel part 12, so that the positioning of the connecting rod stroke is realized. Obviously, when the link moves to the right, the extension 51 of the link cannot enter the inner cavity of the second sleeve portion 12, and the positioning is also achieved. In other words, with reference to a cross section perpendicular to the central axis of the first sleeve portion 12, 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. Specifically, the extension 51 includes stopper portions 54, the stopper portions 54 are formed at both ends of the extension 51 in the longitudinal direction, and the stopper portions 54 are configured to abut against the end portion on the opening side of the first sleeve portion 12.

In the present embodiment, one extending portion 51 extends from one side surface of the link body portion 59, but two extending portions may extend from the same side surface for positioning with the first sleeve portion 12 side and positioning with the second sleeve portion 13 side, respectively. In addition, theoretically, only one side surface of the connecting rod body portion 59 needs to be provided with an extending portion, so that for convenience of processing and manufacturing, and for increasing the strength of the connecting rod, extending portions may be provided on both sides of the connecting rod body portion 59, as shown in fig. 16 corresponding to the present embodiment.

As described above, in the present embodiment, the first sleeve portion 12 is fixedly connected to one end portion of the valve body portion 11 by the first joint 71, and the second sleeve portion 13 is fixedly connected to the other end portion of the valve body portion 11 by the second joint 72. That is, the first joint 71 is used to connect the first sleeve portion 12 and the valve body portion 11, and the second joint 72 is used to connect the second sleeve portion 13 and the valve body portion 11. As a specific example, the first connector 71 and the second connector 72 are substantially plate-shaped, the first connector 71 includes a first connection portion 711 and a second connection portion 722, the first connection portion 711 is fixedly connected to one end of the valve body main body portion, the second connection portion 712 is fixedly connected to one end of the first sleeve portion 12, that is, a through hole portion is provided inside the connection portion for welding and fixing with the second sleeve portion, and the outside is welded and fixed with the valve body main body portion 11. Similarly, the second connecting member 72 may have the same structure as the first connecting member 71, and will not be described in detail.

When the valve body includes the first connector, with reference to a cross section perpendicular to the central axis of the first sleeve portion, a projection of the extension 51 on the cross section overlaps a projection of the first sleeve portion on the cross section, and a projection of the extension 51 on the cross section overlaps a projection of the first connector 71 on the cross section. Thus, when the link is moved leftward to a specific position, the extending portion 51 of the link may abut against the first sleeve portion 12 to be stopped, may abut against the first link 71 to be stopped, or may abut against both the first sleeve portion 12 and the first link 71 to be stopped, as shown in fig. 19. Specifically, the extension 51 includes stopper portions 54, the stopper portions 54 are formed at both ends of the extension 51 in the longitudinal direction, and the stopper portions 54 can be brought into contact with the first sleeve portion 12 and/or the first connector 71.

The extension portion 51 may be formed as a separate component and fixed to the link main body portion 59 by welding or the like, or may be formed integrally with the link main body portion 59, specifically, in the present embodiment, the extension portion extends from the link main body portion 59 in a direction away from the center line S of the link, the extension portion 51 and the link main body portion 59 are formed as an integral material, and a part of the link main body portion 59 may be directly formed as the extension portion 51 at the time of processing. When the extension 51 is of a unitary structure, its length is less than or equal to the length of the valve body 111. When the length of the extension portion is equal to the length of the valve body main portion, the valve body main portion may be connected to the two sleeve portions through another member having a certain length in the lateral direction.

The connecting rod 5 is provided with a through hole which is clamped and limited with the sliding block 6, so that the sliding block 6 can be driven to move together when the connecting rod 5 moves in the left and right directions. The slide block 6 is of a substantially inverted bowl-shaped structure, and in the position shown in fig. 15, the inner cavity of the slide block 6 communicates the space in the second connecting pipe 32 with the space in the third connecting pipe 33, and when the slide block 6 moves to the right to a preset position, the inner cavity of the slide block 6 can communicate the space in the third connecting pipe 33 with the space in the fourth connecting pipe 34. The first piston 41 can slide along the inner wall of the first sleeve part 12, and the second piston 42 can slide along the inner wall of the second sleeve part 13, so that the piston assembly divides the valve cavity into a first valve cavity 411, a second valve cavity 412, and a third valve cavity 413, and when pressure difference is generated due to different pressures between the valve cavities, the pressure difference can push the piston assembly, the connecting rod, and the slider to displace, so that the inner space of the second connecting pipe 32 and the third connecting pipe 33 can be communicated, or the inner space of the third connecting pipe 33 and the fourth connecting pipe 34 can be communicated. The extending part arranged through the connecting rod is abutted against the first sleeve part and/or the first connecting piece, so that the left movement positioning of the piston assembly, the connecting rod and the sliding block is realized, and the right movement positioning of the piston assembly, the connecting rod and the sliding block is realized through the abutting of the extending part arranged through the connecting rod against the second sleeve part and/or the second connecting piece.

The positioning mode has the advantages that the positioning is not dependent on the positioning of the piston component, but the connecting rod is directly utilized for positioning, and the positioning is more accurate. Because the positioning is carried out by utilizing the piston component, the assembly dimension chain errors of the piston, the connecting rod and the slide block need to be considered, in the embodiment, the positioning is independent of the assembly structure of the piston, the relative position of the sleeve part and the valve body part and the dimension of the connecting rod extension part are only required to be ensured, and the requirement on the dimension chain is relatively low. And the extension part of the connecting rod is convenient to process, thereby being beneficial to batch manufacturing.

Herein, the directional terms upper, lower, left and right are defined with reference to the drawings shown in the drawings of the specification only for the convenience of understanding and presentation and should not limit the scope of the present application.

The electromagnetic switching valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. An electromagnetic switching valve is characterized by comprising a valve body (1), a piston assembly, a connecting rod (5) and a sliding block (6), wherein the valve body (1) comprises a valve body main body part (11), a first sleeve part (12) and a second sleeve part (13), the first sleeve part (12) is directly or indirectly fixedly connected with the valve body main body part (11), the second sleeve part (13) is directly or indirectly fixedly connected with the valve body main body part (11), the area surrounded by the longitudinal section of the first sleeve part (12) is smaller than the area surrounded by the longitudinal section of the valve body main body part (11), and the area surrounded by the longitudinal section of the second sleeve part (13) is smaller than the area surrounded by the longitudinal section of the valve body main body part (11); the valve body main body part (11) comprises a first plate-shaped part (111) and a surrounding part (112), wherein the first plate-shaped part (111) and the surrounding part (112) are integrally molded, or the first plate-shaped part (111) and the surrounding part (112) are fixedly connected into an integral structure;

the connecting rod (5) is fixedly connected with the piston assembly, the piston assembly comprises a first piston (41) and a second piston (42), the first piston (41) is fixedly connected with one end of the connecting rod (5), the second piston (42) is fixedly connected with the other end of the connecting rod (5), the first piston (41) is in sliding fit with the inner wall of the first sleeve part (12), and the second piston (42) is in sliding fit with the inner wall of the second sleeve part (13); the connecting rod (5) comprises at least one extension (51), the maximum distance of the extension (51) to the centre line of the connecting rod being greater than the radius of the first sleeve section (12) or the second sleeve section (13).

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

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

4. The electromagnetic switching valve according to claim 1 or 2, characterized in that the extension portion (51) comprises a stopper portion (54), the stopper portion (54) being abuttable to an 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) includes a first connecting portion (711) and a second connecting portion (722), the first connecting portion (711) is fixedly connected to one end portion of the valve body main body portion (11), and the second connecting portion (712) is fixedly connected to one end portion of the first sleeve portion (12).

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

7. The electromagnetic switching valve according to claim 6, characterized in that the extension (51) comprises a stop (54), the stop (54) being able to abut against the first sleeve section (12) and/or the first connecting piece (71).

8. The electromagnetic switch valve according to claim 1, characterized in that the valve body (1) includes a first interface portion (1121) and at least two second interface portions (1122), the first interface portion (1121) is provided to the surrounding portion (112), the at least two second interface portions (1122) are provided to the first plate-like portion (111), and the first interface portion (1121) is provided opposite to the at least two second interface portions (1122).

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

10. The electromagnetic switching valve according to any one of claims 1 to 4, characterized in that the valve body (1) further comprises a third flat plate portion (1111), the third flat plate portion (1111) is located outside the valve body main body portion (11), the third flat plate portion (1111) is fixedly connected to the valve body main body portion (11), and the third flat plate portion (1111) at least partially covers the first plate-like portion (111).

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