Electromagnetic valve, refrigeration equipment and automobile

Abstract

The invention discloses an electromagnetic valve, refrigeration equipment and an automobile. The electromagnetic valve comprises a valve body, a sleeve and a piston, and the valve body is provided with a valve cavity and a valve port communicated with the valve cavity; the sleeve is arranged on the valve body, and the sleeve is communicated with the valve cavity; the piston is movably arranged in the valve cavity at a valve opening position and a valve closing position, when the piston is located at the valve opening position, the valve port is opened, and when the piston is located at the valve closing position, the valve port is closed; the piston is provided with a main guide part and an auxiliary guide part, the main guide part is at least partially arranged in the valve cavity, and the auxiliary guide part is at least partially arranged in the sleeve; the main guiding part is in guiding fit with the cavity wall of the valve cavity, and the auxiliary guiding part is in guiding fit with the inner wall of the sleeve so that the piston can be guided when moving between the valve opening position and the valve closing position. The electromagnetic valve can solve the problem that the piston in the electromagnetic valve is easy to deviate during movement, so that the stability of the electromagnetic valve is improved.

Description

[0001] This application is a divisional application with an application date of January 25, 2022, application number 202210096755.0, and invention name “Solenoid valve, refrigeration equipment and automobile”. Technical Field

[0002] The present invention relates to the technical field of fluid control components, and in particular to a solenoid valve, a refrigeration device and a car. Background Art

[0003] In the prior art, due to the unreasonable structural design of the solenoid valve, when the piston in the solenoid valve moves in the valve cavity, the piston will deviate from the preset movement trajectory, causing the piston to get stuck in the valve cavity, making it impossible for the solenoid valve to open or close the valve port normally, and the stability of the solenoid valve is poor. Summary of the invention

[0004] The main purpose of the present invention is to provide a solenoid valve, aiming to solve the problem that the piston in the solenoid valve is easily displaced during movement, so as to improve the stability of the solenoid valve.

[0005] To achieve the above object, the present invention provides a solenoid valve, which comprises:

[0006] A valve body, wherein the valve body is provided with a valve cavity and a valve port communicating with the valve cavity;

[0007] a sleeve, disposed on the valve body, the sleeve being in communication with the valve cavity; and

[0008] A piston is movably disposed in the valve cavity at a valve opening position and a valve closing position, wherein the piston opens the valve port when the piston is at the valve opening position and closes the valve port when the piston is at the valve closing position;

[0009] The piston has a main guide portion and an auxiliary guide portion, wherein the main guide portion is at least partially disposed in the valve cavity, and the auxiliary guide portion is at least partially disposed in the sleeve; the main guide portion cooperates with the cavity wall guide of the valve cavity, and the auxiliary guide portion cooperates with the inner wall guide of the sleeve to provide guidance for the piston when it moves between the valve opening position and the valve closing position.

[0010] In one embodiment, the valve body comprises:

[0011] a valve seat, the valve seat having the valve port and a receiving groove communicating with the valve port; and

[0012] A valve cover, wherein the valve cover is disposed in the accommodating groove and connected to the sleeve, the valve cover has an inner cavity communicating with the valve port and the sleeve, the inner cavity and the accommodating groove define the valve cavity, the main guide portion is movably disposed in the inner cavity, and the auxiliary guide portion is movably disposed in the sleeve.

[0013] In one embodiment, the outer peripheral wall of the auxiliary guide portion is clearance-matched with the inner wall of the sleeve.

[0014] In one embodiment, the outer peripheral wall of the auxiliary guide portion has a first side wall surface and a second side wall surface, a first gap is formed between the first side wall surface and the inner wall of the sleeve, a second gap is formed between the second side wall surface and the inner wall of the sleeve, and the maximum width of the first gap is smaller than the maximum width of the second gap.

[0015] In one embodiment, the first side wall surface is an arc surface, and the second side wall surface is a plane.

[0016] In one embodiment, there are plural first side wall surfaces and plural second side wall surfaces, and the plural first side wall surfaces and the plural second side wall surfaces are alternately connected in sequence to enclose and form an outer peripheral wall of the auxiliary guide portion.

[0017] In one embodiment, the outer peripheral wall of the main guide portion is gap-matched with the cavity wall of the inner cavity.

[0018] In one embodiment, a cross section of the main guide portion along the radial direction of the piston is arranged in a polygonal shape.

[0019] In one embodiment, the solenoid valve further comprises a sealing member, an annular groove is provided on the outer peripheral wall of the main guide portion, the sealing member is arranged in the annular groove, and the sealing member abuts against the cavity wall of the inner cavity.

[0020] In one embodiment, the upper edge and / or the lower edge of the outer peripheral wall of the main guide portion is / are rounded.

[0021] In one embodiment, in the valve closing position, the lower edge of the outer peripheral wall of the main guide portion is higher than the lower edge of the valve cover, or the lower edge of the outer peripheral wall of the main guide portion is flush with the lower edge of the valve cover.

[0022] In one embodiment, the solenoid valve further includes an elastic member, which is disposed in the accommodating groove, one end of the elastic member abuts against the bottom of the accommodating groove, and the other end abuts against the main guide portion, and the elastic member is used to provide elastic force to the main guide portion.

[0023] In one embodiment, a boss is provided at one end of the main guide portion facing the valve port, and one end of the elastic member is sleeved on the boss and is in clearance fit with the boss.

[0024] In one embodiment, a convex portion is provided on the bottom wall of the inner cavity, and a guide groove is provided on the convex portion, and the guide groove is used to connect the inner cavity with the sleeve.

[0025] In one embodiment, the diameter of the circle where the outer peripheral wall of the auxiliary guide portion is located is smaller than the diameter of the circle where the outer peripheral wall of the main guide portion is located.

[0026] In one embodiment, the piston further includes a connecting section, one end of which is connected to the main guide portion, and the other end of which is connected to the auxiliary guide portion, and the diameter of the circle where the outer circumferential wall of the connecting section lies is smaller than the diameter of the circle where the outer circumferential wall of the auxiliary guide portion lies.

[0027] In one embodiment, in the valve closing position, the lower edge of the auxiliary guide portion is higher than the lower edge of the sleeve.

[0028] In one embodiment, the piston is provided with a communicating hole along its axial direction which penetrates the auxiliary guide portion, the connecting section and the main guide portion, and the communicating hole is used to connect the valve port with the sleeve.

[0029] The present invention also proposes a refrigeration device, which includes the solenoid valve as described above; the solenoid valve includes a valve body, a sleeve and a piston, the valve body is provided with a valve cavity and a valve port connected to the valve cavity; the sleeve is provided on the valve body, and the sleeve is connected to the valve cavity; the piston is movably provided in the valve cavity in an open valve position and a closed valve position, when the piston is in the open valve position, the valve port is opened, and when the piston is in the closed valve position, the valve port is closed; the piston has a main guide part and a secondary guide part, the main guide part is at least partially provided in the valve cavity, and the secondary guide part is at least partially provided in the sleeve; the main guide part cooperates with the cavity wall guide of the valve cavity, and the secondary guide part cooperates with the inner wall guide of the sleeve, so as to guide the piston when it moves between the open valve position and the closed valve position.

[0030] The present invention also provides a car, comprising the refrigeration device as described above.

[0031] The solenoid valve of the present invention comprises a valve body, a sleeve and a piston, the piston having a main guide portion and a secondary guide portion, the main guide portion is at least partially arranged in the valve cavity, the secondary guide portion is at least partially arranged in the sleeve, the main guide portion cooperates with the cavity wall guide of the valve cavity, and the secondary guide portion cooperates with the inner wall guide of the sleeve to provide guidance for the piston when it moves between the valve opening position and the valve closing position. With such an arrangement, the main guide portion and the secondary guide portion can both guide the movement of the piston, so that the piston can move according to a preset trajectory, thereby ensuring that the solenoid valve can normally open or close the valve port, thereby improving the stability of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of an embodiment of a solenoid valve of the present invention;

[0034] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0035] Figure 3 for Figure 2 Schematic diagram of the structure of the piston;

[0036] Figure 4 for Figure 3 A schematic diagram of the structure of the piston from another perspective;

[0037] Figure 5 for Figure 4 Schematic diagram of the cross section of the piston.

[0038] Description of Figure Numbers:

[0039] Label name Label name 100 Valve body 312 Boss 101 Valve cavity 313 Balance hole 102 Media inlet 313a First hole section 103 Media outlet 313b Second hole section 110 Valve Seat 320 Auxiliary guide 111 Valve port 321 The first side wall 112 Storage tank 322 Second side wall 120 Valve cover 330 Connection segment 121 Inner cavity 340 Connecting hole 122 convex part 341 Pilot valve port 200 casing 400 Seals 300 piston 500 Elastic parts 310 Main Steering Department 600 Moving iron core 311 Annular groove 700 Static iron core

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention provides a solenoid valve, a refrigeration device including the solenoid valve, and a car including the refrigeration device. The solenoid valve is applied to a refrigeration system, which may be a refrigeration system of an air conditioner, a freezer, a refrigerator or other refrigeration or heating equipment, and the solenoid valve can control the flow rate of a refrigeration medium in the refrigeration system.

[0045] See also Figures 1 to 3 In one embodiment of the solenoid valve of the present invention, the solenoid valve comprises a valve body 100, a sleeve 200 and a piston 300, wherein the valve body 100 is provided with a valve cavity 101 and a valve port 111 communicating with the valve cavity 101; the sleeve 200 is arranged on the valve body 100, and the sleeve 200 is communicated with the valve cavity 101; the piston 300 is movably arranged in the valve cavity 101 in an open valve position and a closed valve position, and when the piston 300 is in the open valve position, the valve port 111 is opened, and when the piston 300 is in the closed valve position, the valve port 111 is opened. When the piston 300 is in the open valve position, the valve port 111 is closed; the piston 300 has a main guide portion 310 and an auxiliary guide portion 320, the main guide portion 310 is at least partially arranged in the valve cavity 101, and the auxiliary guide portion 320 is at least partially arranged in the sleeve 200; the main guide portion 310 cooperates with the cavity wall guide of the valve cavity 101, and the auxiliary guide portion 320 cooperates with the inner wall guide of the sleeve 200, so as to guide the piston 300 when it moves between the open valve position and the closed valve position.

[0046] In this embodiment, a medium inlet 102 and a medium outlet 103 are respectively provided on two oppositely disposed side walls of the valve body 100. The medium inlet 102 is used for medium inflow, and the medium outlet 103 is used for medium outflow. The medium inlet 102 is communicated with the valve cavity 101, and the medium outlet 103 is communicated with the valve port 111. The piston 300 is movably disposed in the valve cavity 101 and can open or close the valve port 111. When the piston 300 opens the valve port 111, the medium can enter the valve cavity 101 from the medium inlet 102 and can flow out from the medium outlet 103; when the piston 300 closes the valve port 111, the piston 300 blocks the medium from flowing out from the medium outlet 103.

[0047] In the conventional technology of solenoid valves, the piston 300 is usually arranged in the valve body 100, and the piston 300 has only one guide portion. When the piston 300 moves in the valve body 100, the guide portion causes the actual movement trajectory of the piston 300 to deviate from the preset movement trajectory, causing the piston 300 to be stuck in the valve body 100, thereby making the solenoid valve unable to open or close the valve port 111 normally, affecting the use of the solenoid valve. The guiding part of the piston 300 in the present solution includes two parts, namely a main guiding part 310 and an auxiliary guiding part 320, wherein the main guiding part 310 is at least partially arranged in the valve cavity 101, and the auxiliary guiding part 320 is at least partially arranged in the sleeve 200. When the piston 300 moves, the valve cavity 101 and the sleeve 200 can both guide the movement of the piston 300. The valve cavity 101 and the sleeve 200 play a role of dual guiding for the piston 300, which can solve the problem of the piston 300 being offset during movement, so that the piston 300 can move smoothly, thereby improving the stability of the solenoid valve.

[0048] In addition, in order to ensure that the piston 300 can move stably, in conventional solenoid valve technology, the conventional piston 300 is usually designed to be longer, and the conventional piston 300 occupies more space in the solenoid valve. However, the piston 300 of the present application is provided with a main guide portion 310 and a secondary guide portion 320, so that the piston 300 can move stably. Compared with the piston 300 in conventional technology, the height dimension of the piston 300 of the present application can be significantly reduced, thereby reducing the space occupied by the piston 300 in the solenoid valve, and further reducing the weight of the piston 300 and the solenoid valve, which is conducive to saving material costs.

[0049] The solenoid valve of the present invention includes a valve body 100, a sleeve 200 and a piston 300. The piston 300 has a main guide portion 310 and an auxiliary guide portion 320. The main guide portion 310 is at least partially arranged in the valve cavity 101, and the auxiliary guide portion 320 is at least partially arranged in the sleeve 200. The main guide portion 310 cooperates with the cavity wall guide of the valve cavity 101, and the auxiliary guide portion 320 cooperates with the inner wall guide of the sleeve 200 to guide the piston 300 when it moves between the valve opening position and the valve closing position. With such an arrangement, the main guide portion 310 and the auxiliary guide portion 320 can both guide the movement of the piston 300, so that the piston 300 can move according to a preset trajectory, thereby ensuring that the solenoid valve can normally open or close the valve port 111, thereby improving the stability of the solenoid valve.

[0050] See also Figures 1 to 3 In one embodiment, the valve body 100 includes a valve seat 110 and a valve cover 120, the valve seat 110 has the valve port 111 and the accommodating groove 112 connected to the valve port 111; the valve cover 120 is arranged in the accommodating groove 112 and is connected to the sleeve 200, the valve cover 120 has an inner cavity 121 connecting the valve port 111 and the sleeve 200, the inner cavity 121 and the accommodating groove 112 define the valve cavity 101, the main guide portion 310 is movably arranged in the inner cavity 121, and the auxiliary guide portion 320 is movably arranged in the sleeve 200.

[0051] It is understandable that the valve seat 110 and the valve cover 120 can be detachably connected, or can be fixedly connected, which is not limited here. In this embodiment, the groove wall of the accommodating groove 112 of the valve seat 110 is provided with an internal thread, and the valve cover 120 is provided with an external thread, and the valve cover 120 is threadedly connected to the valve seat 110. An inner cavity 121 is provided on the valve cover 120, and one end of the sleeve 200 passes through the valve cover 120 and is connected with the inner cavity 121. The valve cover 120 is arranged in the accommodating groove 112. The accommodating groove 112 of the valve seat 110 and the inner cavity 121 of the valve cover 120 define a valve cavity 101. The main guide portion 310 of the piston 300 is arranged in the inner cavity 121, and the cavity wall of the inner cavity 121 is used to guide one end of the piston 300. The secondary guide portion 320 of the piston 300 is arranged in the sleeve 200, and the inner wall of the sleeve 200 is used to guide the other end of the piston 300. In this way, it can be ensured that both ends of the piston 300 are guided, so that the piston 300 can move stably in the valve cavity 101 of the solenoid valve, thereby improving the stability of the solenoid valve.

[0052] In one embodiment, the peripheral wall of the auxiliary guide portion 320 is in clearance with the inner wall of the sleeve 200. With such a configuration, the auxiliary guide portion 320 can guide the movement of the piston 300 to ensure that the piston 300 can move stably; and, under the premise that the main guide portion 310 has a guiding function, the length of the inner cavity 121 of the valve cover 120 can be shortened, and the depth of the accommodating groove 112 of the valve seat 110 can be reduced, so that the valve seat 110 is easy to process, and it is also beneficial to reduce the weight of the valve seat 110 and the valve cover 120, thereby reducing the production cost of the solenoid valve.

[0053] In addition, there is a gap between the outer peripheral wall of the auxiliary guide part 320 and the inner wall of the sleeve 200, and the gap can guide the movement of the piston 300. Of course, the gap can also allow the medium to flow through, and the specific function can be set as needed.

[0054] See also Figures 2 to 4 In one embodiment, the outer peripheral wall of the auxiliary guide portion 320 has a first side wall surface 321 and a second side wall surface 322, a first gap is formed between the first side wall surface 321 and the inner wall of the sleeve 200, a second gap is formed between the second side wall surface 322 and the inner wall of the sleeve 200, and a maximum width of the first gap is smaller than a maximum width of the second gap.

[0055] It can be understood that in this embodiment, both the first gap and the second gap can allow the medium to flow through. The maximum width of the first gap is smaller than the maximum width of the second gap, that is, the first side wall surface 321 is closer to the inner wall of the sleeve 200 than the second side wall surface 322. The main function of the first gap is to guide the movement of the piston 300, and the main function of the second gap is to allow the medium to flow through. Of course, the first gap can also have the function of allowing the medium to flow through.

[0056] In addition, there can be multiple first gaps and multiple second gaps, that is, the outer peripheral wall of the auxiliary guide part 320 has multiple first side wall surfaces 321 and multiple second side wall surfaces 322 to improve the guiding function of the auxiliary guide part 320 and improve the smoothness of the flow of the medium along the auxiliary guide part 320.

[0057] In one embodiment, the first side wall surface 321 is an arc surface, and the second side wall surface 322 is a plane. It can be understood that the sleeve 200 is a round tube, and the inner wall of the sleeve 200 is an arc shape. In order to better match the sleeve 200, the first side wall surface 321 is set as an arc surface, which is conducive to guiding the auxiliary guide part 320 when moving along the inner wall of the sleeve 200; at the same time, the second side wall is set as a plane, which is convenient for processing the auxiliary guide part 320, which is conducive to improving the processing efficiency of the auxiliary guide part 320.

[0058] In one embodiment, there are multiple first side wall surfaces 321 and multiple second side wall surfaces 322, and the multiple first side wall surfaces 321 and the multiple second side wall surfaces 322 are alternately connected in sequence to enclose and form the outer peripheral wall of the auxiliary guide portion 320. In this way, the outer peripheral wall of the auxiliary guide portion 320 is set in a polygonal shape. Since the first side wall surface 321 is an arc surface, the contour formed by the multiple first side wall surfaces 321 is circular, and the circle is adapted to the inner wall of the circular sleeve 200, so that the auxiliary guide portion 320 is guided when the inner wall of the sleeve 200 moves. In addition, the second side wall surface 322 is a plane, so that the contour formed by the multiple second side wall surfaces 322 is set in a regular polygonal shape, which is conducive to the medium to flow through along the multiple second gaps uniformly, thereby improving the smoothness of the medium flowing in the solenoid valve.

[0059] See also Figures 2 to 4 In one embodiment, the outer peripheral wall of the main guide portion 310 is in clearance with the cavity wall of the inner cavity 121. With such a configuration, the main guide portion 310 can guide the movement of the piston 300 to ensure that the piston 300 can move stably; and, under the premise that the auxiliary guide portion 320 has a guiding function, the length of the inner cavity 121 of the valve cover 120 can be shortened, and the depth of the accommodating groove 112 of the valve seat 110 can be reduced, so that the valve seat 110 is easy to process, and it is also beneficial to reduce the weight of the valve seat 110 and the valve cover 120, thereby reducing the production cost of the solenoid valve.

[0060] It is understandable that the cross-section of the main guide portion 310 of the piston 300 cut along the radial direction of the piston 300 may be circular, elliptical, or polygonal, which is not specifically limited here. In one embodiment, the cross-section of the main guide portion 310 cut along the radial direction of the piston 300 is set in a polygonal shape. The outer peripheral wall of the main guide portion 310 may have a plurality of side wall surfaces, which are sequentially connected to form the outer peripheral wall of the main guide portion 310, and the side wall surface may be a plane or a curved surface, which is not specifically limited here.

[0061] In one embodiment, the solenoid valve further includes a sealing member 400, an annular groove 311 is provided on the outer peripheral wall of the main guide portion 310, the sealing member 400 is disposed in the annular groove 311, and the sealing member 400 abuts against the cavity wall of the inner cavity 121. It can be understood that the gap between the outer peripheral wall of the main guide portion 310 and the cavity wall of the inner cavity 121 is a third gap, and by providing the sealing member 400, part of the third gap is blocked, so that the medium cannot flow from one side of the main guide portion 310 to the other side of the main guide portion 310 along the third gap, so as to control the pressure difference between the two sides of the main guide portion 310. The seal 400 is made of elastic material, and the outer peripheral wall of the seal 400 is in contact with the cavity wall of the inner cavity 121, and the inner peripheral wall of the seal 400 is in clearance with the bottom of the annular groove 311, so that the seal 400 can block part of the third gap, and the seal 400 can move along the inner cavity 121, that is, there is still a clearance fit between the outer peripheral wall of the main guide part 310 and the cavity wall of the inner cavity 121, so that the cavity wall of the inner cavity 121 can also guide the movement of the main guide part 310, and the seal 400 moves with the movement of the main guide part 310.

[0062] In one embodiment, the upper edge and / or lower edge of the outer peripheral wall of the main guide portion 310 is rounded. In this way, when the main guide portion 310 moves in the inner cavity 121, the rounded corners are conducive to guiding the movement of the piston 300 to avoid interference between the outer peripheral wall of the main guide portion 310 and the cavity wall of the inner cavity 121, so that the piston 300 can move smoothly in the inner cavity 121, which is conducive to improving the smoothness of the movement of the piston 300.

[0063] In one embodiment, in the valve closing position, the lower edge of the outer peripheral wall of the main guide portion 310 is higher than the lower edge of the valve cover 120, or the lower edge of the outer peripheral wall of the main guide portion 310 is flush with the lower edge of the valve cover 120. It can be understood that the height of the piston 300 in the valve closing position is lower than the height of the piston 300 in the valve opening position. In this solution, by limiting the lower edge of the outer peripheral wall of the main guide portion 310 to be higher than or flush with the lower edge of the valve cover 120 in the valve closing position, when the main guide portion 310 moves in the inner cavity of the valve cover 120, the cavity wall of the inner cavity 121 can always guide the outer peripheral wall of the main guide portion 310, so as to ensure the stability of the main guide portion 310 moving in the inner cavity 121.

[0064] See also Figure 1 , Figure 2 and Figure 5In one embodiment, the solenoid valve further includes an elastic member 500, which is disposed in the receiving groove 112, one end of the elastic member 500 abuts against the bottom of the receiving groove 112, and the other end abuts against the main guide portion 310, and the elastic member 500 is used to provide elastic force to the main guide portion 310. With such an arrangement, the elastic member 500 can provide elastic force to the piston 300, thereby causing the piston 300 to have a tendency to move upward. When the piston 300 needs to move upward to open the valve port 111, the elastic force provided by the elastic member 500 is conducive to increasing the valve opening speed of the piston 300, thereby improving the performance of the solenoid valve.

[0065] In one embodiment, a boss 312 is provided at one end of the main guide portion 310 facing the valve port 111, and one end of the elastic member 500 is sleeved on the boss 312 and is loosely matched with the boss 312. It is understandable that the elastic member 500 may be a spring, one end of which is sleeved on the boss 312, and the spring and the boss 312 are loosely matched, so that there is no friction between the spring and the boss 312, which is conducive to improving the smoothness of the upward movement of the piston 300.

[0066] See also Figure 1 and Figure 2 In one embodiment, the bottom wall of the inner cavity 121 is provided with a convex portion 122, and the convex portion 122 is provided with a guide groove, and the guide groove is used to connect the inner cavity 121 with the sleeve 200. It can be understood that the piston 300 has a maximum position to open the valve port 111, at which time the main guide portion 310 of the piston 300 close to the valve cover 120 can abut against the bottom wall of the inner cavity 121 of the valve cover 120, that is, the wall surface of the main guide portion 310 of the piston 300 and the bottom surface of the inner cavity 121 of the valve cover 120 can fit together with the movement of the piston 300. Taking into account that the wall surface of the main guide portion 310 of the piston 300 and the bottom surface of the inner cavity 121 of the valve cover 120 are not easy to separate after being fitted together, that is, the surfaces are not easy to separate after being fitted together, the present application sets a protrusion 122 so that the top surface of the protrusion 122 fits with the side wall surface of the main guide portion 310, which is equivalent to reducing the contact area between the surfaces, thereby facilitating the separation of the main guide portion 310 from the valve cover 120.

[0067] Furthermore, by providing a guide groove on the convex portion 122, the medium can flow along the guide groove, and the guide groove is used to connect the inner cavity 121 and the sleeve 200, so that when the piston 300 opens the valve port 111 to the maximum position, the medium can also flow from the inner cavity 121 to the sleeve 200, thereby improving the reliability of the solenoid valve and facilitating the valve closing function of the solenoid valve. Of course, in other embodiments, the convex portion 122 can also be provided on the side of the main guide portion 310 close to the sleeve 200, so that the contact area between the wall surface of the main guide portion 310 and the bottom surface of the inner cavity 121 of the valve cover 120 can also be reduced. The convex portion 122 is also provided with a guide groove to achieve the same effect, which will not be repeated here.

[0068] In one embodiment, the bottom wall of the inner cavity 121 is provided with a plurality of protrusions, and the plurality of protrusions are arranged at intervals to form a guide area. It can be understood that the guide area here is equivalent to the guide groove mentioned above, and the function of the guide area is also to connect the inner cavity 121 and the sleeve 200 so that the medium flows from the inner cavity 121 to the sleeve 200. The function of the guide area is the same as that of the guide groove mentioned above, and will not be repeated here.

[0069] See also Figure 2 and Figure 3 In one embodiment, the diameter of the circle where the outer circumferential wall of the auxiliary guide portion 320 is located is smaller than the diameter of the circle where the outer circumferential wall of the main guide portion 310 is located. Such a configuration can reduce the volume of the piston 300. Compared with the piston 300 in the traditional solenoid valve, the piston 300 of the present application has a smaller diameter of the auxiliary guide portion 320 under the condition of the same guide length, and the auxiliary guide portion 320 occupies less space, thereby reducing the volume of the piston 300, and further reducing the weight of the piston 300 and the weight of the solenoid valve, which is conducive to reducing the production cost of the solenoid valve.

[0070] In one embodiment, the piston 300 further includes a connecting section 330, one end of which is connected to the main guide portion 310, and the other end of which is connected to the auxiliary guide portion 320, and the diameter of the circle where the outer circumferential wall of the connecting section 330 is located is smaller than the diameter of the circle where the outer circumferential wall of the auxiliary guide portion 320 is located. It can be understood that the diameter of the connecting section 330 is smaller than the diameter of the auxiliary guide portion 320, so that the connecting section 330 can reduce the weight of the piston 300 while increasing the guide length of the piston 300. Compared with the traditional piston 300, when the guide length of the piston 300 is the same, the piston 300 of the present application is lighter and has a lower production cost, which is conducive to reducing the production cost of the solenoid valve.

[0071] In one embodiment, at the valve closing position, the lower edge of the auxiliary guide portion 320 is higher than the lower edge of the sleeve 200. It is understandable that the height of the piston 300 at the valve closing position is lower than the height of the piston 300 at the valve opening position. In this solution, by limiting the lower edge of the auxiliary guide portion 320 to be higher than the lower edge of the sleeve 200 at the valve closing position, when the auxiliary guide portion 320 moves in the sleeve 200, the inner wall of the sleeve 200 can always guide the outer peripheral wall of the auxiliary guide portion 320, thereby ensuring the stability of the auxiliary guide portion 320 moving in the sleeve 200.

[0072] In one embodiment, in the valve closing position, the auxiliary guide portion 320 is disposed in the sleeve 200, and the distance between the lower edge of the auxiliary guide portion 320 and the lower edge of the sleeve 200 is not less than 0.2 mm. This arrangement ensures that the inner wall of the sleeve 200 can always guide the outer peripheral wall of the auxiliary guide portion 320, thereby ensuring the stability of the auxiliary guide portion 320 moving in the sleeve 200.

[0073] In one embodiment, the piston 300 is provided with a communication hole 340 along its axial direction, which passes through the auxiliary guide portion 320, the connecting section 330 and the main guide portion 310, and the communication hole 340 is used to connect the valve port 111 with the sleeve 200. Such a configuration enables the medium entering the sleeve 200 from the valve cavity 101 to flow along the communication hole 340 to the valve port 111, and flow out from the valve port 111 to achieve the function of medium flow.

[0074] Combine the following Figure 1 and Figure 2 Briefly explain the working principle of the solenoid valve in this application. Figure 1 The solenoid valve shown in FIG. 1 is normally in the closed state.

[0075] Figure 1 The electromagnetic valve further comprises a moving iron core 600 and a static iron core 700, wherein the static iron core 700 is arranged at one end of the sleeve 200, and the moving iron core 600 is arranged in the sleeve 200. The valve body comprises a valve seat 110 and a valve cover 120, wherein the valve cover 120 is arranged in the valve seat 110, and the valve cover 120 is passed through one end of the sleeve 200, and the sleeve 200 is connected with the valve cavity 101. The main guide portion 310 of the piston 300 is arranged in the valve cavity 101, and the secondary guide portion 320 of the piston 300 is arranged in the sleeve 200; the main guide portion 310 cooperates with the guide of the cavity wall of the valve cavity 101, and the secondary guide portion 320 cooperates with the guide of the inner wall of the sleeve 200, so as to guide the piston 300 when it moves between the valve opening position and the valve closing position. The electromagnetic valve further comprises a driving member, which is arranged outside the sleeve 200, and the driving member comprises a coil, and the coil surrounds the outer circumference of the static iron core 700.

[0076] The receiving groove 112 of the valve seat 110 is connected to the medium inlet 102, the main guide portion 310 of the piston 300 is arranged in the inner cavity 121 of the valve cover 120, and the secondary guide portion 320 of the piston 300 is arranged in the sleeve 200. The main guide portion 310 is located between the valve port 111 and the secondary guide portion 320, and the main guide portion 310 separates the valve cavity 101 from the receiving groove 112. The main guide portion 310 has a balancing hole 313 for connecting the valve cavity 101 with the receiving groove 112. The balancing hole 313 is divided into at least a first hole section 313a and a second hole section 313b from the main guide portion 310 toward the secondary guide portion 320, and the aperture of the first hole section 313a is larger than the aperture of the second hole section 313b; the end of the connecting hole 340 of the piston 300 close to the moving iron core 600 is a pilot valve port 341.

[0077] When the solenoid valve is working, the driving part is energized, so that the static iron core 700 has magnetic force, and the magnetic force can drive the moving iron core 600 to move toward the static iron core 700, that is, at this time, the moving iron core 600 moves away from the piston 300, and the moving iron core 600 opens the pilot valve port 341. At this time, the medium enters the receiving groove 112 from the medium inlet 102, and the medium in the receiving groove 112 enters the inner cavity 121 from the balance hole 313. The medium in the inner cavity 121 enters the sleeve from the gap between the auxiliary guide part 320 and the sleeve, and enters the connecting hole 340 from the pilot valve port 341. The medium flows along the connecting hole 340 to the valve port 111, and is discharged from the valve port 111 through the medium outlet 103. The circulation of the above-mentioned medium generates a sufficiently large pressure difference, so that the piston 300 overcomes the weight and moves toward the moving iron core 600, thereby opening the valve port 111.

[0078] When the solenoid valve stops working, the driving part is powered off, and the static iron core 700 has no magnetic force, so that the moving iron core 600 moves away from the static iron core 700 under the action of gravity, that is, at this time, the moving iron core 600 moves toward the direction close to the piston 300, so that the moving iron core 600 closes the pilot valve port 341. At this time, the medium flows from the medium inlet 102 to the receiving groove 112, and enters the inner cavity 121 from the receiving groove 112 along the balance hole 313. At this time, the receiving groove 112 is a high-pressure cavity, and the inner cavity 121 is a low-pressure cavity. The medium continues to enter until the pressure difference on both sides of the piston 300 is equal, so that the piston 300 moves toward the valve port 111 under the gravity and the pressure of the moving iron core 600 to close the valve port 111.

[0079] The present invention also proposes a refrigeration device, which includes a solenoid valve. The specific structure of the solenoid valve refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0080] The present invention also proposes a car, which includes a refrigeration device. The specific structure of the refrigeration device refers to the above embodiment. Since the car adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0081] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: include: A valve body, wherein the valve body is provided with a valve cavity and a valve port communicating with the valve cavity; a sleeve, disposed on the valve body, the sleeve being in communication with the valve cavity; and A piston is movably disposed in the valve cavity at a valve opening position and a valve closing position, wherein the piston opens the valve port when the piston is at the valve opening position and closes the valve port when the piston is at the valve closing position; The piston has an auxiliary guide portion, which is at least partially arranged in the sleeve, and the outer peripheral wall of the auxiliary guide portion is gap-matched with the inner wall of the sleeve; the auxiliary guide portion is guided and matched with the inner wall of the sleeve to provide guidance for the piston when it moves between the valve opening position and the valve closing position.

2. The solenoid valve according to claim 1, characterized in that The valve body comprises: a valve seat, the valve seat having the valve port and a receiving groove communicating with the valve port; and A valve cover is disposed in the accommodating groove and connected to the sleeve. The valve cover has an inner cavity communicating with the valve port and the sleeve. The inner cavity and the accommodating groove define the valve cavity. The auxiliary guide portion is movably disposed in the sleeve.

3. The solenoid valve according to claim 2, characterized in that: The piston also has a main guide portion, which is movably arranged in the inner cavity and is guided and matched with the cavity wall of the valve cavity.

4. The solenoid valve according to claim 2, characterized in that: The outer peripheral wall of the auxiliary guide portion has a first side wall surface and a second side wall surface, a first gap is formed between the first side wall surface and the inner wall of the sleeve, a second gap is formed between the second side wall surface and the inner wall of the sleeve, and a maximum width of the first gap is smaller than a maximum width of the second gap.

5. The solenoid valve according to claim 4, characterized in that: The first side wall surface is an arc surface, and the second side wall surface is a plane.

6. The solenoid valve according to claim 5, characterized in that There are multiple first side wall surfaces and multiple second side wall surfaces, and the multiple first side wall surfaces and the multiple second side wall surfaces are alternately connected in sequence to enclose and form the outer peripheral wall of the auxiliary guide portion.

7. The solenoid valve according to claim 3, characterized in that: The outer peripheral wall of the main guide portion is gap-matched with the cavity wall of the inner cavity.

8. The solenoid valve according to claim 7, characterized in that The cross section of the main guide portion cut along the radial direction of the piston is arranged in a polygonal shape.

9. The solenoid valve according to claim 7, characterized in that: The solenoid valve further comprises a sealing member. An annular groove is arranged on the outer peripheral wall of the main guide portion. The sealing member is arranged in the annular groove. The sealing member abuts against the cavity wall of the inner cavity.

10. The solenoid valve according to claim 7, characterized in that The upper edge and / or the lower edge of the outer peripheral wall of the main guide portion is / are arranged to be rounded.

11. The solenoid valve according to claim 10, characterized in that In the valve closing position, the lower edge of the outer peripheral wall of the main guide portion is higher than the lower edge of the valve cover, or the lower edge of the outer peripheral wall of the main guide portion is flush with the lower edge of the valve cover.

12. The solenoid valve according to claim 3, characterized in that: The solenoid valve further comprises an elastic member, which is arranged in the accommodating groove, one end of the elastic member abuts against the groove bottom of the accommodating groove, and the other end abuts against the main guide portion, and the elastic member is used to provide elastic force to the main guide portion.

13. The solenoid valve according to claim 12, characterized in that A boss is provided on one end of the main guide portion facing the valve port, and one end of the elastic member is sleeved on the boss and is in clearance fit with the boss.

14. The solenoid valve according to claim 2, characterized in that: A convex portion is provided on the bottom wall of the inner cavity, and a guide groove is provided on the convex portion. The guide groove is used to connect the inner cavity with the sleeve.

15. The solenoid valve according to claim 1, characterized in that The piston also has a main guide portion, which is at least partially arranged in the valve cavity. The main guide portion cooperates with the cavity wall of the valve cavity to guide the piston when it moves between the valve opening position and the valve closing position.

16. The solenoid valve according to claim 15, characterized in that The diameter of the circle where the outer peripheral wall of the auxiliary guide portion is located is smaller than the diameter of the circle where the outer peripheral wall of the main guide portion is located.

17. The solenoid valve according to claim 16, characterized in that The piston also includes a connecting section, one end of which is connected to the main guide portion, and the other end is connected to the auxiliary guide portion, and the diameter of the circle where the outer circumferential wall of the connecting section is located is smaller than the diameter of the circle where the outer circumferential wall of the auxiliary guide portion is located.

18. The solenoid valve according to claim 17, characterized in that In the valve closing position, the lower edge of the auxiliary guide portion is higher than the lower edge of the sleeve.

19. The solenoid valve according to claim 17, characterized in that The piston is provided with a communicating hole penetrating through the auxiliary guide portion, the connecting section and the main guide portion along its axial direction, and the communicating hole is used to connect the valve port with the sleeve.

20. A refrigeration device, characterized in that: Comprising a solenoid valve as claimed in any one of claims 1 to 19.

21. A car, characterized in that: Comprising the refrigeration device as claimed in claim 20.

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