Electromagnetic valve, refrigeration equipment and automobile

Abstract

According to the technical scheme, the electromagnetic valve comprises a valve body, a piston assembly, a sleeve, a static iron core and a movable iron core, and the valve body is provided with a valve cavity and a valve port; the piston assembly is movably arranged in the valve cavity; the sleeve penetrates through the valve body so as to be communicated with the valve cavity; the static iron core is arranged in the sleeve and arranged at the end, away from the valve cavity, of the sleeve. The movable iron core is movably arranged in the sleeve and between the static iron core and the valve cavity, and the movable iron core can be close to or away from the static iron core in the axial direction of the sleeve, so that the piston assembly opens or closes the valve port; the end, away from the movable iron core, of the static iron core is provided with an installation hole for a screw to penetrate through, the installation hole is used for fixing the electromagnetic coil, the hole depth of the installation hole is L1, the length of the static iron core from the end away from the valve cavity to the other end close to the valve cavity is L, and L1 is not larger than 0.7 L. The mounting hole does not influence the magnetic field intensity of the electromagnetic valve, and can effectively fix the electromagnetic coil, so that the magnetic field intensity of the electromagnetic valve is prevented from being reduced, and the action performance of the electromagnetic valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to a solenoid valve, a refrigeration device and an automobile. Background Art

[0002] In the prior art, the action performance of the solenoid valve is particularly important. Designers hope to drive the valve body with a lower voltage so that the solenoid valve can operate more reliably. In the industry, usually, the action performance is improved by increasing the electromagnetic coil, but this will change the volume of the solenoid valve, making it bulky, and at the same time, the product cost will increase significantly.

[0003] Conventionally, mounting holes are provided on the static iron core, and the electromagnetic coil is fixed on the static iron core by means of screws passing through the mounting holes. However, the existence of the mounting holes will weaken the magnetic field intensity of the solenoid valve. If the mounting holes are too large, the magnetic field intensity will be seriously weakened, and when the magnetic field intensity decreases, the action performance of the solenoid valve will decrease. Summary of the Utility Model

[0004] The main object of the utility model is to propose a solenoid valve, aiming to solve the problem that the mounting holes weaken the magnetic field intensity of the solenoid valve, resulting in the reduction of the action performance of the solenoid valve.

[0005] The technical solution of the utility model proposes a solenoid valve, including:

[0006] A valve body having a valve cavity and a valve port;

[0007] A piston assembly movably disposed in the valve cavity;

[0008] A sleeve passing through the valve body to communicate with the valve cavity;

[0009] A static iron core disposed in the sleeve and at one end of the sleeve away from the valve cavity;

[0010] A moving iron core movably disposed in the sleeve and between the static iron core and the valve cavity. The moving iron core can move axially along the sleeve close to or away from the static iron core, so that the piston assembly opens or closes the valve port;

[0011] Wherein, a mounting hole for a screw to pass through is provided at one end of the static iron core away from the moving iron core for fixing the electromagnetic coil. The hole depth of the mounting hole is L1, and the length between one end of the static iron core away from the valve cavity to the other end close to the valve cavity is L. L1 and L satisfy: L1 is not greater than 0.7L.

[0012] In one embodiment, L1 is not less than 2.5 mm.

[0013] In one embodiment, the diameter of the end of the static iron core away from the moving iron core is D, and the diameter of the mounting hole is D1. D1 and D satisfy: D1 is not greater than 0.5D.

[0014] In one embodiment, the static iron core is welded to the sleeve.

[0015] In one embodiment, a groove is provided at one end of the moving iron core close to the static iron core. The groove is flared in the direction from the moving iron core towards the static iron core; a convex portion adapted to the groove is provided at one end of the static iron core close to the moving iron core. In the direction from the static iron core to the moving iron core, the diameter of the convex portion gradually decreases.

[0016] In one embodiment, the groove wall of the groove and the outer peripheral wall of the convex portion are in a conical surface setting.

[0017] In one embodiment, in the cross-section of the convex portion intercepted by a plane along the axis direction of the sleeve, the included angle formed by the generatrix of the convex portion and the axis of the sleeve is θ. θ is not greater than 60° and not less than 10°.

[0018] In one embodiment, the moving iron core is further provided with a mounting groove. The mounting groove is provided at the bottom of the groove and communicates with the groove; the solenoid valve further includes an elastic member. The elastic member is arranged in the mounting groove. One end of the elastic member is connected to the moving iron core, and the other end is connected to the static iron core.

[0019] In one embodiment, a smooth coating is provided on the outer peripheral wall of the moving iron core.

[0020] In one embodiment, the thickness of the smooth coating is not less than 0.003 mm and not greater than 0.1 mm.

[0021] In one embodiment, the material of the smooth coating is polytetrafluoroethylene.

[0022] The present utility model further provides a refrigeration device, including a solenoid valve, and the solenoid valve includes:

[0023] A valve body, having a valve cavity and a valve port;

[0024] A piston assembly, movably arranged in the valve cavity;

[0025] A sleeve, passing through the valve body to communicate with the valve cavity;

[0026] A static iron core, arranged in the sleeve and at one end of the sleeve away from the valve cavity;

[0027] The moving iron core is movably arranged inside the sleeve and between the static iron core and the valve cavity. The moving iron core can move axially along the sleeve closer to or away from the static iron core, so that the piston assembly opens or closes the valve port.

[0028] Wherein, an installation hole for a screw to penetrate is provided at one end of the static iron core away from the moving iron core for fixing the electromagnetic coil. The depth of the installation hole is L1, and the length of the static iron core from the end away from the valve cavity to the end close to the valve cavity is L. L1 and L satisfy: L1 is not greater than 0.7L.

[0029] The present utility model further provides an automobile, including a refrigeration device. The refrigeration device includes a solenoid valve, and the solenoid valve includes:

[0030] A valve body having a valve cavity and a valve port;

[0031] A piston assembly movably arranged inside the valve cavity;

[0032] A sleeve penetrating through the valve body to communicate with the valve cavity;

[0033] A static iron core arranged inside the sleeve and at one end of the sleeve away from the valve cavity;

[0034] The moving iron core is movably arranged inside the sleeve and between the static iron core and the valve cavity. The moving iron core can move axially along the sleeve closer to or away from the static iron core, so that the piston assembly opens or closes the valve port.

[0035] Wherein, an installation hole for a screw to penetrate is provided at one end of the static iron core away from the moving iron core for fixing the electromagnetic coil. The depth of the installation hole is L1, and the length of the static iron core from the end away from the valve cavity to the end close to the valve cavity is L. L1 and L satisfy: L1 is not greater than 0.7L.

[0036] The technical solution of the present utility model opens an installation hole at one end of the static iron core away from the moving iron core, and the depth of the installation hole is not greater than 0.7 times the length of the static iron core, so that the installation hole can not affect the magnetic field strength of the solenoid valve and can effectively fix the electromagnetic coil, avoiding the reduction of the magnetic field strength of the solenoid valve, thereby improving the action performance of the solenoid valve. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0038] Figure 1 It is a schematic structural diagram of a solenoid valve;

[0039] Figure 2 is Figure 1 an enlarged view of part A in

[0040] Figure 3 a schematic structural diagram of the static iron core.

[0041] Explanation of the reference numerals in the drawings:

[0042] Reference numeral Name Reference numeral Name 10 Solenoid valve 110 Valve cavity 100 Valve body 120 Valve port 200 Piston assembly 410 Mounting hole 300 Bushing 420 Convex part 400 Stationary iron core 510 Groove 500 Moving iron core 520 Mounting groove 600 Elastic member

[0043] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0045] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0047] The present utility model provides a solenoid valve, a refrigeration device including the solenoid valve, and an automobile including the refrigeration device. The solenoid valve is applied to a refrigeration system, which can be the refrigeration system of an air conditioner, a freezer, a refrigerator or other refrigeration and heating devices. The solenoid valve can control the flow rate of the refrigerant in the refrigeration system.

[0048] Please refer to Figures 1 to 3 , the present utility model provides a solenoid valve 10, which includes a valve body 100, a piston assembly 200, a sleeve 300, a stationary iron core 400 and a moving iron core 500. The valve body 100 has a valve cavity 110 and a valve port 120; the piston assembly 200 is movably arranged in the valve cavity 110; the sleeve 300 is inserted through the valve body 100 to communicate with the valve cavity 110; the stationary iron core 400 is arranged in the sleeve 300 and at one end of the sleeve 300 away from the valve cavity 110; the moving iron core 500 is movably arranged in the sleeve 300 and between the stationary iron core 400 and the valve cavity 110. The moving iron core 500 can move axially along the sleeve 300 closer to or away from the stationary iron core 400, so that the piston assembly 200 opens or closes the valve port 120; an installation hole 410 for a screw to penetrate is provided at one end of the stationary iron core 400 away from the moving iron core 500 for fixing the electromagnetic coil. The hole depth of the installation hole 410 is L1, and the length of the stationary iron core 400 from the end away from the valve cavity 110 to the end close to the valve cavity 110 is L. L1 is not greater than 0.7L.

[0049] Specifically, the solenoid valve 10 includes a valve body 100, a piston assembly 200, a sleeve 300, a stationary iron core 400 and a moving iron core 500. The valve body 100 has a valve cavity 110 and a valve port 120. One end of the sleeve 300 is inserted through the valve body 100 and communicates with the valve cavity 110. A medium inlet and a medium outlet are provided on the valve body 100. The medium inlet communicates with the valve cavity 110 and is used for the medium to flow in; the medium outlet communicates with the valve port 120 and is used for the medium to flow out. The solenoid valve 10 further includes a piston assembly 200. A part of the piston assembly 200 is arranged in the valve cavity 110, and another part of the piston assembly 200 is arranged in the sleeve 300. The piston assembly 200 is movably arranged in the valve cavity 110 and the sleeve 300. One end of the piston assembly 200 close to the moving iron core 500 has a pilot valve port 120. The stationary iron core 400 is arranged at one end of the sleeve 300, the piston assembly 200 is arranged at the other end of the sleeve 300, and the moving iron core 500 is arranged between the stationary iron core 400 and the piston. By the movement of the piston assembly 200, the piston assembly 200 can open or close the pilot valve port 120 of the piston assembly 200.

[0050] The static iron core 400 and the moving iron core 500 are arranged inside the sleeve 300. The static iron core 400 is fixedly arranged at one end of the sleeve 300 away from the valve cavity 110, and the moving iron core 500 is movably arranged at the other end of the sleeve 300 close to the valve cavity 110. The moving iron core 500 can move axially along the sleeve 300 closer to or away from the static iron core 400. The solenoid valve 10 further includes an electromagnetic coil, which is arranged outside the sleeve 300 and surrounds the outer periphery of the static iron core 400. When the solenoid valve 10 works, the electromagnetic coil is energized, so that the static iron core 400 has magnetic force, and the magnetic force can drive the moving iron core 500 to move towards the static iron core 400, that is, at this time, the moving iron core 500 moves in the direction away from the valve cavity 110. When the solenoid valve 10 stops working, the electromagnetic coil is de-energized, and the static iron core 400 has no magnetic force, so that the moving iron core 500 moves in the direction away from the static iron core 400 under the action of gravity, that is, at this time, the moving iron core 500 moves in the direction close to the valve cavity 110.

[0051] An installation hole 410 is formed at one end of the static iron core 400 away from the moving iron core 500. The installation hole 410 can allow screws to penetrate into it to fix the electromagnetic coil on the outer periphery of the static iron core 400. However, if the depth of the installation hole 410 is too large, the magnetic field strength of the solenoid valve 10 will be weakened, thereby reducing the operating performance of the solenoid valve 10; if the depth of the installation hole 410 is too small, the electromagnetic coil cannot be effectively fixed. Therefore, by restricting the depth of the installation hole 410, the depth of the installation hole 410 neither affects the magnetic field strength of the solenoid valve 10 nor can effectively fix the electromagnetic coil. Specifically, the hole depth of the installation hole 410 is L1, and the length between one end of the static iron core 400 away from the valve cavity 110 and the other end close to the valve cavity 110 is L. L1 is not greater than 0.7L. When the depth of the installation hole 410 is greater than 0.7 times the length of the static iron core 400, although the electromagnetic coil can be effectively fixed, the magnetic field strength of the solenoid valve 10 is severely weakened, thereby greatly reducing the operating performance of the solenoid valve 10. The maximum depth of the installation hole 410 is 0.7 times the length of the static iron core 400. At this time, the depth of the installation hole 410 neither affects the magnetic field strength of the solenoid valve 10 nor can effectively fix the electromagnetic coil. The depth L1 of the installation hole 410 can also be: L1 = 0.65L, L1 = 0.5L, L1 = 0.42L or L1 = 0.35L, etc., which are not limited here.

[0052] The technical solution of the present utility model forms an installation hole 410 at one end of the static iron core 400 away from the moving iron core 500, and the depth of the installation hole 410 is not greater than 0.7 times the length of the static iron core 400, so that the installation hole 410 can neither affect the magnetic field strength of the solenoid valve 10 nor can effectively fix the electromagnetic coil, avoiding the reduction of the magnetic field strength of the solenoid valve 10, thereby improving the operating performance of the solenoid valve 10.

[0053] In one embodiment, the hole depth of the installation hole 410 is L1, and L1 is not less than 2.5 mm.

[0054] Please refer to Figure 3 When L1 is less than 2.5 mm, the mounting hole 410 is too shallow to effectively fix the electromagnetic coil. After the solenoid valve 10 is used on the vehicle for a long time, the electromagnetic coil is likely to become loose, thus affecting the performance of the solenoid valve 10. L1 can be 2.5 mm, 2.8 mm, 3.0 mm, 3.5 mm, etc., and at the same time L1 is not greater than 0.7L.

[0055] In an embodiment, the diameter of the end of the stationary iron core 400 away from the moving iron core 500 is D, and the diameter of the mounting hole 410 is D1. D1 and D satisfy: D1 is not greater than 0.5D.

[0056] Please refer to Figure 3 The end of the stationary iron core 400 away from the moving iron core 500 is generally roughly cylindrical, and its diameter is D. The mounting hole 410 is generally also a circular hole, and its diameter is D1. D1 is not greater than 0.5D. When D1 is greater than 0.5D, the diameter of the mounting hole 410 is too large, which will also greatly weaken the magnetic field strength of the solenoid valve 10, thus reducing the operating performance of the solenoid valve 10. The maximum diameter of the mounting hole 410 is 0.5D, which can allow the screw to pass through to effectively fix the electromagnetic coil and will not affect the magnetic field strength of the solenoid valve 10. According to the diameter of the stud of the screw, the diameter D1 of the mounting hole 410 can also be D1 = 0.45D, D1 = 0.40D, D1 = 0.35D, etc., which is not limited here.

[0057] In an embodiment, the stationary iron core 400 is welded to the sleeve 300.

[0058] Please refer to Figure 1 and Figure 2 The sleeve 300 is generally in the shape of a cylinder with both ends penetrating. The stationary iron core 400 is arranged inside the sleeve 300, and the end of the sleeve 300 away from the valve cavity 110 is used to block the port at the end of the sleeve 300 away from the valve cavity 110. The outer peripheral wall of the stationary iron core 400 is welded to the inner peripheral wall of the sleeve 300 to realize the fixed connection between the stationary iron core 400 and the sleeve 300. Further, the stationary iron core 400 includes a first connection section and a second connection section. The second connection section is arranged between the first connection section and the moving iron core 500 and connects the first connection section. The diameter of the first connection section is larger than that of the second connection section, and a stepped surface is formed between the first connection section and the second connection section. The end surface of the tube wall at the end of the sleeve 300 away from the valve cavity 110 abuts against the stepped surface, the inner wall of the sleeve 300 is connected to the outer wall of the second connection section, and the first connection section completely blocks the port of the sleeve 300. In this way, the connection between the stationary iron core 400 and the sleeve 300 is more stable, and the situation where the upper surface of the stationary iron core 400 is lower than the port of the sleeve 300 is also avoided.

[0059] In one embodiment, a groove 510 is provided at one end of the moving iron core 500 close to the static iron core 400, and the groove 510 is arranged in a flared shape in the direction of the moving iron core 500 towards the static iron core 400; a convex portion 420 adapted to the groove 510 is provided at one end of the static iron core 400 close to the moving iron core 500, and in the direction from the static iron core 400 to the moving iron core 500, the diameter of the convex portion 420 gradually decreases.

[0060] Please refer to Figure 1 and Figure 2 , by providing the convex portion 420 on the static iron core 400 and the groove 510 on the moving iron core 500, it is ensured that when the static iron core 400 has a relatively large volume, the space occupied by the static iron core 400 and the moving iron core 500 is less. That is, adopting the structure of the convex portion 420 and the groove 510 is beneficial to improving the space utilization rate and reducing the volume of the solenoid valve 10. Moreover, by providing the convex portion 420 on the static iron core 400 and the groove 510 on the moving iron core 500, the suction area of the suction surface when the moving iron core 500 and the static iron core 400 are in contact is increased. When the moving iron core 500 contacts and collides with the static iron core 400, the larger suction area is beneficial to reducing the force of the moving iron core 500 hitting the static iron core 400, thereby slowing down the contact collision between the moving iron core 500 and the static iron core 400, and at the same time is also beneficial to reducing the noise generated when the moving iron core 500 and the static iron core 400 contact and collide. The groove 510 is arranged in a flared shape in the direction of the moving iron core 500 towards the static iron core 400, and the diameter of the convex portion 420 gradually decreases in the direction from the static iron core 400 to the moving iron core 500. It can be understood that the groove 510 is arranged in a flared shape to facilitate the contact between the moving iron core 500 and the static iron core 400. The flared groove 510 has the function of guiding the convex platform, so as to ensure that the moving iron core 500 can move along the preset trajectory, thereby improving the stability of the movement of the moving iron core 500. And, the convex portion 420 of the static iron core 400 is arranged in a tapered shape towards the moving iron core 500, which can better match the groove 510, thereby improving the stability of the movement of the moving iron core 500.

[0061] In one embodiment, the groove wall of the groove 510 and the outer peripheral wall of the convex portion 420 are arranged in a conical surface.

[0062] Please refer to Figure 1 and Figure 2, the groove walls of the groove 510 and the outer peripheral walls of the convex portion 420 are arranged in a conical surface, which can greatly increase the suction area between the moving iron core 500 and the static iron core 400. After the suction area is increased, the magnetic field acting force between the moving iron core 500 and the static iron core 400 is increased. After the acting force is increased, the operating performance of the solenoid valve 10 can be improved. On the cross-section of the static iron core 400 intercepted by the plane along the axis direction of the sleeve 300, the outer peripheral wall of the convex portion 420 can be linear or arc-shaped in the axis direction of the sleeve 300. On the cross-section of the moving iron core 500 intercepted by the plane along the axis direction of the sleeve 300, the groove walls of the groove 510 can be linear along with the linear outer peripheral wall of the convex portion 420, or can be arc-shaped along with the arc-shaped outer peripheral wall of the convex portion 420.

[0063] In an embodiment, on the cross-section of the convex portion 420 intercepted by the plane along the axis direction of the sleeve 300, the included angle formed by the generatrix of the convex portion 420 and the axis of the sleeve 300 is θ, θ is not greater than 60° and not less than 10°.

[0064] Please refer to Figure 3 , the outer peripheral wall of the convex portion 420 is arranged in a conical surface. On the cross-section of the convex portion 420 intercepted by the plane along the axis direction of the sleeve 300, the included angle formed by the generatrix of the convex portion 420 and the axis of the sleeve 300 is θ. When ensuring a certain suction area between the moving iron core 500 and the static iron core 400, the smaller θ is, the longer the length of the static iron core 400 is, and the longer the total length and volume of the solenoid valve 10 are; when θ is greater than 60°, the length of the static iron core 400 is too long. The larger θ is, the distance between the moving iron core 500 and the static iron core 400 will increase. After the distance increases, the suction force between the moving iron core 500 and the static iron core 400 is reduced, which is not conducive to the operating performance of the solenoid valve 10; when θ is less than 10°, the distance between the moving iron core 500 and the static iron core 400 is too large, and the suction force between the moving iron core 500 and the static iron core 400 is small. θ can be any value between 10° and 60°, such as 10°, 15°, 22°, 35°, 48°, 55° or 60°, etc., and is not limited here.

[0065] In an embodiment, the moving iron core 500 is further provided with a mounting groove 520. The mounting groove 520 is arranged at the bottom of the groove 510 and communicates with the groove 510; the solenoid valve 10 further includes an elastic member 600. The elastic member 600 is arranged in the mounting groove 520. One end of the elastic member 600 is connected to the moving iron core 500, and the other end is connected to the static iron core 400.

[0066] Please refer to Figure 1 and Figure 2, by providing the installation groove 520, it is convenient to quickly install the elastic member 600 and limit the moving direction of the elastic member 600. One end of the elastic member 600 extends outwards from the installation groove 520 and abuts against the convex portion 420, so that both ends of the elastic member 600 are abutted. Thus, when the moving iron core 500 moves towards the static iron core 400, the elastic member 600 can synchronously slow down the moving speed of the moving iron core 500, thereby effectively reducing the collision between the moving iron core 500 and the static iron core 400, and making the wear generated when the moving iron core 500 contacts and collides with the static iron core 400 relatively small. On the other hand, when the solenoid valve 10 is energized, the moving iron core 500 moves towards the static iron core 400 due to the magnetic force, and the elastic member 600 is compressed; after the solenoid valve 10 is de-energized, the magnetic force between the moving iron core 500 and the static iron core 400 disappears, the moving iron core 500 moves away from the static iron core 400, the elastic member 600 resumes deformation, and at the same time provides a elastic force to the moving iron core 500, making it faster and easier to separate from the static iron core 400.

[0067] In one embodiment, a smooth coating is provided on the outer peripheral wall of the moving iron core 500.

[0068] The moving iron core 500 can slide back and forth along its axial direction within the sleeve 300. There is contact between the outer peripheral wall of the moving iron core 500 and the inner surface of the sleeve 300. Providing a smooth coating on the outer peripheral wall of the moving iron core 500 can reduce the sliding friction coefficient between the moving iron core 500 and the sleeve 300, thereby reducing the friction force between the two, and ultimately improving the operating performance of the solenoid valve 10.

[0069] In one embodiment, the thickness of the smooth coating is not less than 0.003 mm and not more than 0.1 mm.

[0070] The thickness of the smooth coating is not less than 0.003 mm and not more than 0.1 mm. It can be understood that when the smooth coating is too thin, the smooth performance of the moving iron core 500 is poor; when the smooth coating is too thick, the production cost of the moving iron core 500 is high. By limiting the thickness of the smooth coating to be between 0.003 mm and 0.1 mm, not only can the moving iron core 500 have good smoothness, but also the situation of high material cost caused by too thick smooth coating can be avoided. The thickness of the smooth coating can be 0.003 mm, or 0.005 mm, or 0.01 mm, or 0.05 mm, or 0.1 mm, etc., and is not specifically limited herein.

[0071] In one embodiment, the material of the smooth coating is polytetrafluoroethylene.

[0072] Polytetrafluoroethylene (PTFE for short), commonly known as "the king of plastics", is a high molecular polymer obtained by polymerizing tetrafluoroethylene as a monomer. Polytetrafluoroethylene has the characteristics of high temperature resistance and a relatively low coefficient of friction. When the load slides, the coefficient of friction changes, but the value is only between 0.05 and 0.15. The setting of polytetrafluoroethylene on the outer peripheral wall of the moving iron core 500 can reduce the sliding friction coefficient between the moving iron core 500 and the sleeve 300, thereby reducing the frictional force between the two and ultimately improving the operating performance of the solenoid valve 10.

[0073] The present utility model also proposes a refrigeration device, which includes a solenoid valve 10. The specific structure of the solenoid valve 10 refers to the above-mentioned embodiment. Since this refrigeration device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0074] The present utility model also proposes a vehicle, which includes a refrigeration device. The specific structure of the refrigeration device refers to the above-mentioned embodiment. Since this vehicle adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0075] The above are only optional embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A solenoid valve, characterized in that, it includes: a valve body having a valve cavity and a valve port; a piston assembly movably disposed in the valve cavity; a sleeve passing through the valve body to communicate with the valve cavity; a stationary iron core disposed in the sleeve and at one end of the sleeve away from the valve cavity; a movable iron core movably disposed in the sleeve and between the stationary iron core and the valve cavity, the movable iron core can move closer to or away from the stationary iron core along the axial direction of the sleeve, so that the piston assembly opens or closes the valve port; a groove is provided at one end of the movable iron core close to the stationary iron core, and a convex portion adapted to the groove is provided at one end of the stationary iron core close to the movable iron core. In the cross-section intercepted by the plane along the axial direction of the sleeve, the included angle between the generatrix of the convex portion and the axis of the sleeve is θ, θ is not greater than 60° and not less than 10°; wherein, an installation hole for a screw to penetrate is provided at one end of the stationary iron core away from the movable iron core for fixing the electromagnetic coil. The hole depth of the installation hole is L1, and the length between one end of the stationary iron core away from the valve cavity to the other end close to the valve cavity is L. L1 and L satisfy: L1 is not greater than 0.7L and not less than 2.5 mm.

2. The solenoid valve according to claim 1, characterized in that, the diameter of one end of the stationary iron core away from the movable iron core is D, and the diameter of the installation hole is D1. D1 and D satisfy: D1 is not greater than 0.5D.

3. The solenoid valve according to claim 1, characterized in that, the stationary iron core is welded to the sleeve.

4. The solenoid valve according to claim 1, characterized in that, the groove is arranged in a flared shape from the direction of the movable iron core towards the stationary iron core; in the direction from the stationary iron core to the movable iron core, the diameter of the convex portion gradually decreases.

5. The solenoid valve according to claim 4, characterized in that, the groove wall of the groove and the outer peripheral wall of the convex portion are arranged in a conical surface.

6. The solenoid valve according to claim 4, characterized in that, the movable iron core is further provided with an installation groove, the installation groove is arranged at the bottom of the groove and communicates with the groove; the solenoid valve further includes an elastic member, the elastic member is arranged in the installation groove, one end of the elastic member is connected to the movable iron core, and the other end is connected to the stationary iron core.

7. The solenoid valve according to claim 1, characterized in that, a smooth coating is provided on the outer peripheral wall of the movable iron core.

8. The solenoid valve according to claim 7, characterized in that, the thickness of the smooth coating is not less than 0.003 mm and not greater than 0.1 mm.

9. The solenoid valve according to claim 7, characterized in that, the material of the smooth coating is polytetrafluoroethylene.

10. A refrigeration device, characterized in that, it includes the solenoid valve according to any one of claims 1-9.

11. A vehicle, characterized in that, it includes the refrigeration device according to claim 10.

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