CN215059636U - Solenoid valve and refrigerating system - Google Patents

Abstract

The utility model relates to a solenoid valve and refrigerating system, solenoid valve include valve body subassembly, slide valve subassembly, first locating part and second locating part. The valve body assembly is provided with a valve cavity and a first connector and a second connector which are communicated with the valve cavity. The sliding valve assembly comprises a piston, a sliding block and a connecting rod for connecting the piston and the sliding block, and the piston can push the sliding block to move in the valve cavity through the connecting rod so as to control the connection and disconnection between the first interface and the second interface. The first limiting part and the second limiting part are respectively arranged on two sides of the sliding block and used for limiting the moving stroke of the sliding block. When the sliding block stops at the first limiting part, the sliding block separates the first interface and the second interface. When the sliding block stops at the second limiting part, the valve cavity is communicated with the first interface and the second interface. The utility model provides a break-make between solenoid valve, the sliding valve subassembly can the first interface of accurate control and the second interface.

Description

Solenoid valve and refrigerating system

Technical Field

The utility model relates to the technical field of valves, especially, relate to a solenoid valve and refrigerating system.

Background

The solenoid valve includes a valve body assembly and a spool valve assembly. The valve body assembly is provided with a valve cavity, and the sliding valve assembly moves in the valve cavity to control the connection and disconnection between the first interface and the second interface. The slide valve assembly includes a piston, a slider, and a connecting rod connecting the piston and the slider. Generally, the sliding valve assembly realizes the movement limitation of the sliding valve assembly through the cooperation of a piston and a limiting part, and specifically, when the sliding valve assembly moves towards one end of the valve body assembly until one end of the piston abuts against one limiting part, the sliding valve assembly blocks a first interface and a second interface; when the sliding valve assembly moves towards the other end of the valve body assembly to the other end of the piston and abuts against the other limiting piece, the sliding valve assembly is communicated with the first interface and the second interface. However, the piston is easily elastically deformed when being pressed by the stopper, so that the sliding valve assembly is difficult to move in place, and it is difficult to accurately control the connection and disconnection between the first port and the second port.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a solenoid valve and a refrigeration system, which can precisely control the on/off between the first port and the second port.

The utility model provides a solenoid valve, solenoid valve include valve body subassembly, slide valve subassembly, first locating part and second locating part. The valve body assembly is provided with a valve cavity and a first connector and a second connector which are communicated with the valve cavity. The sliding valve assembly comprises a piston, a sliding block and a connecting rod for connecting the piston and the sliding block, and the piston can push the sliding block to move in the valve cavity through the connecting rod so as to control the connection and disconnection between the first interface and the second interface. The first limiting part and the second limiting part are respectively arranged on two sides of the sliding block and used for limiting the moving stroke of the sliding block. When the sliding block stops at the first limiting part, the sliding block separates the first interface and the second interface. When the sliding block stops at the second limiting part, the valve cavity is communicated with the first interface and the second interface.

In an embodiment of the present invention, the first position-limiting member is a first end cap, the second position-limiting member is a middle end cap, and the solenoid valve further includes a second end cap. The middle end plate is arranged in the valve cavity to divide the valve cavity into a power cavity and an on-off cavity; the first end cover is arranged at one end of the on-off cavity far away from the middle end plate to seal the on-off cavity, and the second end cover is arranged at one end of the power cavity far away from the middle end plate to seal the power cavity. The piston is arranged in the power cavity and divides the power cavity into a first cavity and a second cavity, the sliding block is arranged in the on-off cavity, and the connecting rod penetrates through the middle end plate and is connected with the piston and the sliding block. The assembly of the first end cover, the middle end plate and the valve body assembly is simple, so that the first end cover is used as a first limiting part, the middle end plate is used as a second limiting part, and the assembly difficulty of the electromagnetic valve is greatly reduced. And, first end cover and middle end plate are comparatively firm with being connected of valve body subassembly, therefore, utilize first end cover as first locating part and utilize middle end plate as the second locating part, can show the structural strength who promotes the solenoid valve, avoid first locating part and second locating part to produce under the impact of slide valve subassembly not hard up, therefore, so set up for the break-make between first interface and the second interface can be controlled more accurately to the slide valve subassembly.

In an embodiment of the present invention, the electromagnetic valve further includes a first capillary and a second capillary, the first capillary communicates with the first cavity to let in the fluid medium to the first cavity through the first capillary or to discharge the fluid medium in the first cavity through the first capillary, and the second capillary communicates with the second cavity to let in the fluid medium to the second cavity through the second capillary or to discharge the fluid medium in the second cavity through the second capillary.

In an embodiment of the utility model, the solenoid valve still includes waterproof circle, and middle end plate is equipped with the perforation, and the connecting rod wears to locate middle end plate through perforating, and fenestrate inner wall is equipped with the ring channel along perforation circumference setting, and waterproof circle card is located in the ring channel, and the connecting rod outside is located to waterproof circle cover. Through setting up waterproof circle, can avoid fluid medium to enter into the break-make intracavity from the power chamber through the clearance between connecting rod and the perforation, and influence the result of use of solenoid valve. Therefore, the arrangement enhances the waterproofness of the middle end plate, and is favorable for the good operation of the electromagnetic valve. And the waterproof ring is clamped in the annular groove, so that the assembly difficulty of the waterproof ring is reduced, and the assembly efficiency of the electromagnetic valve is improved.

In an embodiment of the present invention, a connecting portion of the slider and the connecting rod forms a limiting step, and the slider is abutted to the second locating part through the limiting step. So set up, the cooperation of slider and second locating part is simpler, is favorable to the manufacturing of solenoid valve.

In an embodiment of the present invention, the slider includes a connecting plate, a first segment, a second segment and an elastic member, one end of the connecting plate is connected to the connecting rod, and the other end extends in a direction away from the connecting rod; the connecting plate is provided with a connecting hole, and the first sub-block and the second sub-block are respectively arranged at the connecting hole from two sides of the connecting plate; the two ends of the elastic piece are respectively connected with the first sub-block and the second sub-block, and the elastic piece can push the first sub-block and the second sub-block to be respectively abutted against the valve body assembly. The elastic piece pushes the first sub-block and the second sub-block to abut against the valve body assembly respectively, so that the sliding block is connected with the valve body assembly more tightly, and the sliding block can be used for effectively separating the first interface and the second interface.

In an embodiment of the present invention, the first block and the second block are made of teflon or stainless steel. The polytetrafluoroethylene surface hardness is lower, can make the connection of first piecemeal and valve body subassembly inseparabler, and can make the connection of second piecemeal and valve body subassembly inseparabler. The first block and the second block which are made of stainless steel are easy to machine and form, and the manufacturing cost of the electromagnetic valve is favorably reduced.

In an embodiment of the present invention, the inner wall of the valve body assembly is provided with a sliding groove extending along the axial direction, and the sliding groove is blocked by the two sides of the connecting plate to prevent the sliding valve assembly and the valve body assembly from rotating relatively. Therefore, the sliding valve assembly and the valve body assembly cannot rotate relatively, and therefore the relative positions of the first sub-block and the valve body assembly and the relative positions of the second sub-block and the valve body assembly cannot be changed, and the sealing effect of the electromagnetic valve is enhanced.

In an embodiment of the present invention, the valve assembly includes a first valve body and a second valve body, the first valve body includes a main body section and a connecting section, the outer diameter of the connecting section is smaller than the outer diameter of the main body section, a step structure is formed between the main body section and the connecting section, and a sleeve of the second valve body is disposed on the connecting section and stops at the step structure. The valve body assembly adopts a split type design, so that the processing difficulty of the valve body assembly is reduced, and the assembly difficulty of the electromagnetic valve is also reduced. Through set up the stair structure on first valve body, improved the assembly precision of first valve body with the second valve body, be favorable to the quick accurate assembly of solenoid valve.

The utility model also provides a refrigerating system, this refrigerating system include as above arbitrary one embodiment the solenoid valve.

The utility model provides a solenoid valve and refrigerating system because slider both sides are located respectively to first locating part and second locating part can restrict the removal stroke of slider, also are exactly the removal stroke of restriction sliding valve subassembly. When the sliding block stops at the first limiting part, the sliding block separates the first interface and the second interface. When the sliding block stops at the second limiting part, the valve cavity is communicated with the first interface and the second interface. Therefore, the first limiting piece and the second limiting piece control the moving stroke of the slide valve assembly by limiting the moving stroke of the slide block, and the slide valve assembly moves in the moving stroke range to realize the connection and disconnection of the first interface and the second interface. Because the slider is very little in deformation when being extruded by the first locating part or the second locating part, the slider can be ensured to move in place, namely the sliding valve component is ensured to move in place, and the electromagnetic valve can accurately control the on-off between the first interface and the second interface.

Drawings

Fig. 1 is a schematic structural diagram of a solenoid valve according to an embodiment of the present invention;

fig. 2 is a first cross-sectional view of the solenoid valve according to an embodiment of the present invention in a communication state;

fig. 3 is a second cross-sectional view of the solenoid valve according to an embodiment of the present invention in a communication state;

fig. 4 is a first cross-sectional view of the solenoid valve according to an embodiment of the present invention in a closed state;

fig. 5 is a second cross-sectional view of the solenoid valve in a closed state according to an embodiment of the present invention.

Reference numerals: 1. a valve body assembly; 11. a first valve body; 111. a main body section; 112. a connecting section; 113. a step structure; 12. a second valve body; 13. a valve cavity; 131. a power cavity; 131a, a first cavity; 131b, a second cavity; 132. switching on and off the cavity; 14. a first interface; 15. a second interface; 16. a sliding groove; 2. a spool valve assembly; 21. a piston; 22. an assembly hole; 23. a slider; 231. a connecting plate; 231a, a limit step; 232. connecting holes; 233. a first block; 234. second blocking; 235. a first card hole; 236. an elastic member; 24. a connecting rod; 241. a first external thread section; 25. fastening a nut; 26. a first gasket; 3. a first limit piece; 4. a second end cap; 5. a second limiting member; 51. perforating; 52. an annular groove; 53. a waterproof ring; 6. a first adapter tube; 7. a second adapter tube; 8. a first capillary tube; 9. a second capillary.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-5, the present invention provides a solenoid valve, which includes a valve body assembly 1, a sliding valve assembly 2, a first limiting member 3 and a second limiting member 5. The valve body assembly 1 is provided with a valve cavity 13, and the valve body assembly 1 is provided with a first interface 14 and a second interface 15 which are communicated with the valve cavity 13. The slide valve assembly 2 comprises a piston 21, a slide block 23 and a connecting rod 24 connecting the piston 21 and the slide block 23, wherein the piston 21 can push the slide block 23 to move in the valve cavity 13 through the connecting rod 24 so as to control the connection and disconnection between the first port 14 and the second port 15. The first limiting part 3 and the second limiting part 5 are respectively arranged on two sides of the sliding block 23 to limit the moving stroke of the sliding block 23. When the sliding block 23 stops at the first limiting member 3, the sliding block 23 separates the first interface 14 and the second interface 15. When the sliding block 23 stops at the second limiting member 5, the valve chamber 13 communicates with the first port 14 and the second port 15.

The solenoid valve allows a two-way flow of the fluid medium, i.e. the fluid medium can enter the valve chamber 13 from the first port 14 and flow out from the second port 15, or the fluid medium can enter the valve chamber 13 from the second port 15 and flow out from the first port 14.

Because the first limiting member 3 and the second limiting member 5 are respectively disposed at two sides of the slider 23, the first limiting member 3 and the second limiting member 5 can limit the moving stroke of the slider 23, that is, limit the moving stroke of the sliding valve assembly 2. When the sliding block 23 stops at the first limiting member 3, the sliding block 23 separates the first interface 14 and the second interface 15. When the sliding block 23 stops at the second limiting member 5, the valve chamber 13 communicates with the first port 14 and the second port 15. In this way, the first limiting member 3 and the second limiting member 5 control the moving stroke of the spool assembly 2 by limiting the moving stroke of the slider 23, and the spool assembly 2 moves within the moving stroke range to open and close the first port 14 and the second port 15. Because the slider 23 is slightly deformed when being pressed by the first limiting member 3 or the second limiting member 5, the slider 23 can be ensured to move in place, that is, the sliding valve assembly 2 can be ensured to move in place, and therefore the electromagnetic valve can accurately control the on-off between the first interface 14 and the second interface 15.

In one embodiment, as shown in fig. 1 to 5, the first limiting member 3 is a first end cap, the second limiting member 5 is a middle end plate, and the solenoid valve further includes a second end cap 4. An intermediate end plate is provided in the valve chamber 13 to divide the valve chamber 13 into a power chamber 131 and an on-off chamber 132. The first end cover is arranged at one end of the on-off cavity 132 far away from the middle end plate to seal the on-off cavity 132, and the second end cover 4 is arranged at one end of the power cavity 131 far away from the middle end plate to seal the power cavity 131. The piston 21 is arranged in the power cavity 131 and divides the power cavity 131 into a first cavity 131a and a second cavity 131b, the slider 23 is arranged in the on-off cavity 132, and the connecting rod 24 penetrates through the middle end plate and connects the piston 21 and the slider 23. The assembly of the first end cap and the intermediate end plate with the valve body assembly 1 is relatively simple, and therefore, the first end cap is used as the first limiting part 3 and the intermediate end plate is used as the second limiting part 5, so that the assembly difficulty of the electromagnetic valve is greatly reduced. Moreover, the first end cap and the middle end plate are firmly connected with the valve body assembly 1, so that the first end cap is used as the first limiting part 3, and the middle end plate is used as the second limiting part 5, the structural strength of the electromagnetic valve can be obviously improved, the first limiting part 3 and the second limiting part 5 are prevented from being loosened under the impact of the sliding valve assembly 2, and therefore the sliding valve assembly 2 can more accurately control the connection and disconnection between the first interface 14 and the second interface 15.

In the present embodiment, as shown in fig. 1 to 5, when one end of the slider 23 stops at the first end cap, the slider 23 separates the first port 14 from the second port 15, and when the other end of the slider 23 stops at the middle end plate, the valve chamber 13 communicates the first port 14 with the second port 15.

In other embodiments, when one end of the sliding block 23 stops at the first end cover, the valve chamber 13 communicates with the first port 14 and the second port 15, and when the other end of the sliding block 23 stops at the middle end plate, the sliding block 23 separates the first port 14 and the second port 15.

In one embodiment, as shown in fig. 1 to 5, the solenoid valve further includes a first capillary 8 and a second capillary 9, the first capillary 8 is communicated with the first cavity 131a to introduce the fluid medium into the first cavity 131a through the first capillary 8 or discharge the fluid medium in the first cavity 131a through the first capillary 8, and the second capillary 9 is communicated with the second cavity 131b to introduce the fluid medium into the second cavity 131b through the second capillary 9 or discharge the fluid medium in the second cavity 131b through the second capillary 9. When the pressure in the second chamber 131b is greater than the pressure in the first chamber 131a, the fluid medium in the second chamber 131b can push the spool valve assembly 2 to abut against the first end cover, so that the slider 23 blocks the first port 14 and the second port 15; when the pressure in the first chamber 131a is greater than the pressure in the second chamber 131b, the fluid medium in the first chamber 131a can push the spool valve assembly 2 against the middle end plate to communicate the first port 14 and the second port 15.

In an embodiment, as shown in fig. 1 to 5, the solenoid valve further includes a waterproof ring 53, the middle end plate is provided with a through hole 51, the connecting rod 24 is inserted into the middle end plate through the through hole 51, an annular groove 52 circumferentially arranged along the through hole 51 is provided on an inner wall of the through hole 51, the waterproof ring 53 is clamped in the annular groove 52, and the waterproof ring 53 is sleeved outside the connecting rod 24. By arranging the waterproof ring 53, the fluid medium can be prevented from entering the on-off cavity 132 from the power cavity 131 through the gap between the connecting rod 24 and the through hole 51, and the using effect of the electromagnetic valve can be prevented from being influenced. Therefore, the arrangement enhances the waterproofness of the middle end plate, and is favorable for the good operation of the electromagnetic valve. In addition, the waterproof ring 53 is clamped in the annular groove 52, so that the assembly difficulty of the waterproof ring 53 is reduced, and the assembly efficiency of the electromagnetic valve is improved.

Further, as shown in fig. 1 to 5, the annular groove 52 is plural in number, and the waterproof ring 53 is plural in number. The waterproof rings 53 are clamped in the annular grooves 52 in a one-to-one correspondence. So set up, the waterproof nature of middle end plate has further been strengthened. Specifically, a plurality of annular grooves 52 are provided in parallel on the inner wall of the penetration hole 51.

Further, the waterproof ring 53 is a silicone ring, or the waterproof ring 53 is a rubber ring. The silica gel ring has stronger hydrophobicity and can effectively isolate the fluid medium from entering the on-off cavity 132. In other embodiments, the waterproof ring 53 is a rubber ring, which is low in price and beneficial to reducing the manufacturing cost of the electromagnetic valve.

In one embodiment, as shown in fig. 1 to 5, the slider 23 includes a connecting plate 231, a first segment 233, a second segment 234, and an elastic member 236, wherein the connecting plate 231 has one end connected to the link 24 and the other end extending away from the link 24. The connecting plate 231 is provided with a connecting hole 232, and the first and second sub-blocks 233 and 234 are mounted at the connecting hole 232 from both sides of the connecting plate 231, respectively. The two ends of the elastic member 236 are respectively connected to the first block 233 and the second block 234, and the elastic member 236 can push the first block 233 and the second block 234 to abut against the valve body assembly 1. The elastic member 236 pushes the first block 233 and the second block 234 to abut against the valve body assembly 1, so that the connection between the slider 23 and the valve body assembly 1 is tighter, which is beneficial for the slider 23 to block the first port 14 and the second port 15 more effectively. Specifically, the elastic member 236 is a compression spring.

In this embodiment, as shown in fig. 1 to 5, one end of the second sub-block 234 abuts against the valve body assembly 1, and one end of the second sub-block 234 away from the valve body assembly 1 is provided with a first locking hole 235, one end of the first sub-block 233 abuts against the valve body assembly 1, and the other end thereof is inserted into the first locking hole 235.

In other embodiments, one end of the first sub-block 233 abuts against the valve body assembly 1, one end of the first sub-block 233 away from the valve body assembly 1 is provided with a second clamping hole, one end of the second sub-block 234 abuts against the valve body assembly 1, and the other end is inserted into the second clamping hole.

In one embodiment, as shown in fig. 1-5, the first block 233 and the second block 234 are made of stainless steel. The stainless steel has higher hardness, is not easy to wear and deform, thereby being beneficial to the sliding block 23 to move in place and accurately controlling the moving stroke of the sliding valve component 2. Moreover, the stainless steel is easy to machine and form, and is beneficial to reducing the manufacturing cost of the electromagnetic valve. In another embodiment, the first block 233 and the second block 234 are made of teflon, which has excellent chemical stability, corrosion resistance and wear resistance, is not easily worn and deformed, and thus facilitates the movement of the sliding block 23 in place, and thus facilitates the precise control of the movement stroke of the sliding valve assembly 2.

In one embodiment, as shown in fig. 1 to 5, the solenoid valve further includes a fastening nut 25, the piston 21 is provided with a fitting hole 22, and the connecting rod 24 has a first external thread section 241 at one end thereof, the first external thread section 241 passing through the fitting hole 22 and being threadedly coupled to the fastening nut 25. Thus, the assembly of the piston 21 and the connecting rod 24 is simpler, and the assembly efficiency of the solenoid valve is improved. Specifically, the fastening nut 25 is tightly abutted on one side against the piston 21 to avoid loosening of the fastening nut 25 and the first external thread section 241.

Further, as shown in fig. 1 to 5, the electromagnetic valve further includes a first gasket 26, the first gasket 26 is sleeved on the first external thread section 241, the first gasket 26 is disposed between the fastening nut 25 and the piston 21, and the fastening nut 25, the first gasket 26 and the piston 21 are tightly fitted. The first gasket 26 has a locking effect, and can prevent the fastening nut 25 from loosening, thereby improving the use stability of the solenoid valve.

In one embodiment, as shown in fig. 1 to 5, the inner wall of the valve body assembly 1 is provided with a sliding groove 16 extending along the axial direction, and both sides of the connecting plate 231 are clipped into the sliding groove 16 to prevent the sliding valve assembly 2 from rotating relative to the valve body assembly 1. In this way, the spool valve assembly 2 and the valve body assembly 1 do not rotate relatively, and therefore, the relative positions of the first block 233 and the valve body assembly 1 and the second block 234 and the valve body assembly 1 do not change, so that the sealing effect of the solenoid valve is enhanced.

In an embodiment, as shown in fig. 1 to 5, a connection portion of the slider 23 and the link 24 forms a limiting step 231a, and the slider 23 abuts against the second limiting member 5 through the limiting step 231 a. So set up, the cooperation of slider 23 and second locating part 5 is simpler, is favorable to the manufacturing of solenoid valve. Specifically, the width of the connection plate 231 is larger than the aperture of the through hole 51, and the connection plate 231 is engaged with the through hole 51.

In an embodiment, as shown in fig. 1 to 5, the valve body assembly 1 includes a first valve body 11 and a second valve body 12, the first valve body 11 includes a main body section 111 and a connecting section 112 connected to each other, an outer diameter of the connecting section 112 is smaller than an outer diameter of the main body section 111, a step structure 113 is formed between the main body section 111 and the connecting section 112, and an end of the second valve body 12 is sleeved on the connecting section 112 and stopped by the step structure 113. The valve body assembly 1 adopts a split type design, so that the processing difficulty of the valve body assembly 1 is reduced, and the assembly difficulty of the electromagnetic valve is also reduced. Through set up stair structure 113 on first valve body 11, improved the assembly precision of first valve body 11 with second valve body 12, be favorable to the quick accurate assembly of solenoid valve. Specifically, the piston 21 is disposed in the second valve body 12, and the slider 23 is disposed in the first valve body 11, so that the difficulty in assembling the solenoid valve is reduced. The first connecting pipe 6 and the second connecting pipe 7 are both connected to the first valve body 11, and the wall thickness of the first valve body 11 is greater than that of the second valve body 12, so that the connection of the first connecting pipe 6 and the first valve body 11 can be firmer, and the connection of the second connecting pipe 7 and the first valve body 11 can be firmer.

Specifically, the first valve body 11 is welded to the second valve body 12. In this way, the structural strength of the valve body assembly 1 is further enhanced.

The utility model also provides a refrigerating system, this refrigerating system include as above arbitrary one embodiment the solenoid valve.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (10)

1. The electromagnetic valve is characterized by comprising a valve body assembly (1), a slide valve assembly (2), a first limiting piece (3) and a second limiting piece (5); the valve body assembly (1) is provided with a valve cavity (13), and the valve body assembly (1) is provided with a first interface (14) and a second interface (15) which are communicated with the valve cavity (13);

the sliding valve assembly (2) comprises a piston (21), a sliding block (23) and a connecting rod (24) connecting the piston (21) and the sliding block (23), and the piston (21) can push the sliding block (23) to move in the valve cavity (13) through the connecting rod (24) so as to control the connection and disconnection between the first interface (14) and the second interface (15);

the first limiting piece (3) and the second limiting piece (5) are fixed on the valve body assembly (1) and are respectively arranged on two sides of the sliding block (23) so as to limit the moving stroke of the sliding block (23); when the sliding block (23) stops at the first limiting part (3), the sliding block (23) cuts off the first interface (14) and the second interface (15); when the sliding block (23) stops at the second limiting piece (5), the valve cavity (13) is communicated with the first interface (14) and the second interface (15).

2. The solenoid valve according to claim 1, characterized in that said first stop (3) is a first end cap, said second stop (5) is an intermediate end plate, said solenoid valve further comprising a second end cap (4);

the middle end plate is arranged in the valve cavity (13) to divide the valve cavity (13) into a power cavity (131) and an on-off cavity (132); the first end cover is arranged at one end, far away from the middle end plate, of the on-off cavity (132) to seal the on-off cavity (132), and the second end cover (4) is arranged at one end, far away from the middle end plate, of the power cavity (131) to seal the power cavity (131);

the piston (21) is arranged in the power cavity (131) and divides the power cavity (131) into a first cavity (131a) and a second cavity (131b), the slider (23) is arranged in the on-off cavity (132), and the connecting rod (24) penetrates through the middle end plate and is connected with the piston (21) and the slider (23).

3. The solenoid valve according to claim 2, characterized in that it further comprises a first capillary (8) and a second capillary (9), said first capillary (8) communicating with said first chamber (131a) for feeding a fluid medium into said first chamber (131a) through said first capillary (8) or discharging a fluid medium in said first chamber (131a) through said first capillary (8), said second capillary (9) communicating with said second chamber (131b) for feeding a fluid medium into said second chamber (131b) through said second capillary (9) or discharging a fluid medium in said second chamber (131b) through said second capillary (9).

4. The electromagnetic valve according to claim 2, characterized by further comprising a waterproof ring (53), wherein the middle end plate is provided with a through hole (51), the connecting rod (24) is arranged on the middle end plate through the through hole (51), an annular groove (52) is arranged on the inner wall of the through hole (51) along the circumferential direction of the through hole (51), the waterproof ring (53) is clamped in the annular groove (52), and the waterproof ring (53) is sleeved outside the connecting rod (24).

5. The electromagnetic valve according to claim 1, wherein a connecting portion of the slider (23) and the connecting rod (24) forms a limiting step (231a), and the slider (23) abuts against the second limiting member (5) through the limiting step (231 a).

6. The electromagnetic valve according to claim 1, wherein the slider (23) comprises a connecting plate (231), a first block (233), a second block (234) and an elastic member (236), the connecting plate (231) having one end connected to the link (24) and the other end extending away from the link (24); the connecting plate (231) is provided with a connecting hole (232), and the first sub-block (233) and the second sub-block (234) are respectively installed at the connecting hole (232) from two sides of the connecting plate (231); two ends of the elastic piece (236) are respectively connected with the first sub-block (233) and the second sub-block (234), and the elastic piece (236) can push the first sub-block (233) and the second sub-block (234) to be respectively abutted against the valve body assembly (1).

7. The solenoid valve according to claim 6, characterized in that the material of the first and second segments (233, 234) is polytetrafluoroethylene or stainless steel.

8. The solenoid valve according to claim 6, characterized in that the inner wall of the valve body assembly (1) is provided with a sliding groove (16) extending along the axial direction, and both sides of the connecting plate (231) are clipped into the sliding groove (16) to prevent the relative rotation of the spool valve assembly (2) and the valve body assembly (1).

9. The solenoid valve according to claim 1, wherein the valve body assembly (1) comprises a first valve body (11) and a second valve body (12), the first valve body (11) comprises a main body section (111) and a connecting section (112) which are connected, the outer diameter of the connecting section (112) is smaller than that of the main body section (111), a step structure (113) is formed between the main body section (111) and the connecting section (112), and one end of the second valve body (12) is sleeved on the connecting section (112) and stopped at the step structure (113).

10. A refrigeration system comprising a solenoid valve according to any one of claims 1 to 9.

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