CN218582332U - Pilot valve and switching valve - Google Patents

Abstract

The application relates to the technical field of refrigeration, in particular to a pilot valve and a switching valve. The pilot valve includes: a pilot valve body having a pilot valve cavity; the guide valve seat assembly penetrates through the guide valve body and is connected with the guide valve body; the guide sliding block is positioned in the guide valve cavity, and two ends of the guide sliding block are respectively abutted against the inner wall of the guide valve seat assembly and can slide on the guide valve seat assembly along the axial direction of the guide valve body; the iron core assembly penetrates through one end of the guide valve body and is connected with the guide valve body, and the iron core assembly comprises a movable iron core and a fixed iron core which are sequentially arranged along the axial direction of the iron core assembly; the pilot valve also comprises a first through pipe, a second through pipe and a third through pipe which penetrate through the pilot valve seat assembly, and the first through pipe, the third through pipe and the second through pipe are located in the opposite direction of the pilot valve body. The application has the advantages that: the friction resistance of the guide sliding block in the reversing process is small, the reversing is flexible, and the risk of the guide sliding block being stuck is low.

Description

Pilot valve and switching valve

Technical Field

The application relates to the technical field of refrigeration, in particular to a pilot valve and a switching valve.

Background

The switching valve is arranged in the air conditioning unit and used for controlling the communication or the partition of the pipeline, thereby realizing the diversion circulation of the refrigerant.

The conventional switching valve includes a four-way valve including a main valve and a pilot valve, wherein the main valve includes a valve body and a piston assembly movable in the valve body. The pilot valve is connected with the main valve, and the pilot valve can control the removal of piston assembly in the barrel. The existing pilot valve comprises a pilot valve body, a pilot valve seat, a first through pipe, a second through pipe, a third through pipe and a fourth through pipe, wherein the pilot valve seat is connected with the pilot valve body. The first flow pipe, the second flow pipe and the third flow pipe are arranged in parallel on one side of the pilot valve body, and the fourth flow pipe is arranged on the opposite side of the valve body. The pilot valve still includes and leads the slider, and the one end of leading the slider and lead the disk seat butt to can slide at leading the disk seat surface, with intercommunication first flow-through pipe and second flow-through pipe, or intercommunication second flow-through pipe and third flow-through pipe.

However, when the guide slider is reversed, the low pressure exists in the guide slider, and the high pressure exists outside the guide slider. The pressure difference force borne by the guide sliding block is large, so that the guide sliding block is in close contact with the guide valve seat, the friction resistance borne by the guide sliding block in reversing is large, the required tension for reversing is large, the guide sliding block is difficult to reverse, and the guide sliding block needs larger power to slide, so that the cost of the switching valve is improved.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a pilot valve and a switching valve capable of reducing the commutation resistance of the pilot slider.

A pilot valve, comprising: a pilot valve body having a pilot valve cavity; the pilot valve seat assembly penetrates through the pilot valve body and is connected with the pilot valve body; the guide sliding block is positioned in the guide valve cavity, and two ends of the guide sliding block are respectively abutted against the inner wall of the guide valve seat assembly and can slide on the guide valve seat assembly along the axial direction of the guide valve body; the iron core assembly penetrates through one end of the guide valve body and is connected with the guide valve body, and the iron core assembly comprises a movable iron core and a fixed iron core which are sequentially arranged along the axial direction of the iron core assembly; the pilot valve also comprises a first through pipe, a second through pipe and a third through pipe which are arranged in the pilot valve seat component in a penetrating mode, and the first through pipe, the third through pipe and the second through pipe are located in the opposite direction of the pilot valve body; with the sliding of the guide sliding block, the second through pipe and the third through pipe can be communicated through the guide sliding block, or the second through pipe and the first through pipe can be communicated through the guide sliding block.

It can be understood that the second through pipe is located at a position opposite to the first through pipe and the third through pipe and is communicated with the first through pipe through the guide slider, and the direction of the differential pressure applied to the guide slider is a direction from the peripheral side of the guide slider to the central axis of the guide slider. The two ends of the guide sliding block are in a pressure balance state along the radial direction of the guide valve body, and the pressure difference force is almost zero. Therefore, the friction resistance of the guide sliding block in the reversing process is small, the reversing is flexible, and the risk of the guide sliding block being stuck is low. Meanwhile, the guide sliding block is small in degree of friction damage and longer in service life, so that the cost of the guide valve is reduced.

In one embodiment, the pilot valve seat assembly includes a first pilot valve seat and a second pilot valve seat which are oppositely arranged, the pilot block is located between the first pilot valve seat and the second pilot valve seat, and two ends of the pilot block respectively abut against the first pilot valve seat and the second pilot valve seat.

So set up, can avoid leading the slider motion in-process and produce the skew, improve the stability of pilot valve structure.

In one embodiment, the first guide valve seat is provided with a first communicating hole, and one end of the second flow pipe is inserted into the first communicating hole; the second guide valve seat is provided with a second communicating hole and a third communicating hole, one end of the first flow pipe is inserted into the second communicating hole, and one end of the third flow pipe is inserted into the third communicating hole.

So set up, be convenient for with the connection of capillary, can realize the flow of refrigerant in leading the valve simultaneously.

In one embodiment, the guide slider includes: the first sealing surface is positioned at one end of the guide sliding block and is attached to the first guide valve seat; the second sealing surface is positioned at one end of the guide sliding block, which is far away from the first sealing surface, and is attached to the second guide valve seat; wherein the first sealing surface and the second sealing surface are approximately equal in size.

By the arrangement, the sealing performance between the guide sliding block and the guide valve seat component can be enhanced.

In one embodiment, the guide sliding block is provided with a channel penetrating through two ends of the guide sliding block, and the areas of two ends of the channel are equal along the axial direction of the guide sliding block.

So set up, can reduce the differential pressure that the guide sliding block receives.

In one embodiment, the guide slider is in the shape of a straight cylinder.

So set up, easily processing can reduce manufacturing cost.

In one embodiment, the pilot valve further comprises: and the fourth circulating pipe penetrates through one end, far away from the iron core component, of the pilot valve body and is connected with the pilot valve body.

So set up, can increase the flow of pilot valve, improve the switching-over speed of diverter valve.

In one embodiment, the thermal expansion coefficient of the guide sliding block is approximately equal to that of the guide valve seat and the guide valve body.

So set up, can avoid leading the slider card dead.

In one embodiment, the pilot block, the pilot valve seat assembly and the pilot valve body are made of the same material.

So set up, can avoid leading the slider card to die.

The application also provides a switching valve, which comprises a main valve and a pilot valve, wherein the main valve comprises a valve body and a piston assembly capable of moving in the valve body; the pilot valve is any one of the above, the pilot valve is connected with the main valve, and the pilot valve can control the movement of the piston assembly in the valve body.

Compared with the prior art, the utility model provides a pilot valve, the frictional resistance that the guide block received at the switching-over in-process is little, and the switching-over is nimble, and the guide block card is dead risk low.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a switching valve provided in the present application.

FIG. 2 is a cross-sectional view of a pilot valve provided herein.

FIG. 3 is a cross-sectional view of a pilot valve provided herein.

Fig. 4 is a schematic structural diagram of a guide slider provided in the present application.

Fig. 5 is a cross-sectional view of a guide shoe provided herein.

Fig. 6 is a cross-sectional view of the switching valve provided in the present application.

Fig. 7 is a cross-sectional view of the switching valve provided in the present application.

The symbols in the drawings represent the following meanings:

100. a switching valve; 10. a pilot valve; 11. a pilot valve body; 111. a valve guide cavity; 12. a pilot valve seat assembly; 121. a first pilot valve seat; 1211. a first communication hole; 122. a second pilot valve seat; 1221. a second communication hole; 1222. a third communication hole; 13. a guide slider; 131. a first sealing surface; 132. a second sealing surface; 133. a channel; 14. an iron core assembly; 141. a movable iron core; 142. fixing an iron core; 143. an elastic member; 144. a bracket; 15. a first flow pipe; 16. a second flow pipe; 17. a third flow pipe; 18. a fourth flow-through pipe; 20. a main valve; 21. a valve body; 211. a valve cavity; 2111. a first chamber; 2112. a second chamber; 22. a piston assembly; 23. a first adapter tube; 24. a low pressure pipe; 25. a second connection pipe; 26. a high pressure pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The use of the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like in the description of the present application is for purposes of illustration only and is not intended to represent the only embodiment.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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 application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present application provides a pilot valve 10, wherein the pilot valve 10 is applied to a switching valve 100. The switching valve 100 may be a three-way valve, a four-way valve, a five-way valve, a six-way valve, or the like. In the present application, a four-way valve is mainly taken as an example for detailed explanation.

The existing pilot valve comprises a pilot valve body, a pilot valve seat, a first through pipe, a second through pipe, a third through pipe and a fourth through pipe, wherein the pilot valve seat is connected with the pilot valve body. The first flow pipe, the second flow pipe and the third flow pipe are arranged in parallel on one side of the pilot valve body, and the fourth flow pipe is arranged on the opposite side of the valve body. The pilot valve still includes and leads the slider, and the one end of leading the slider and lead the disk seat butt to can slide at leading the disk seat surface, with intercommunication first flow-through pipe and second flow-through pipe, or intercommunication second flow-through pipe and third flow-through pipe. When the guide slide block is reversed, low pressure exists in the guide slide block, and high pressure exists outside the guide slide block. The pressure difference force borne by the guide sliding block is large, so that the guide sliding block is in close contact with the guide valve seat, the friction resistance borne by the guide sliding block in reversing is large, the required tension for reversing is large, the guide sliding block is difficult to reverse, and the guide sliding block needs larger power to slide, so that the cost of the switching valve is improved.

Referring to fig. 2 and 3, the present application provides a pilot valve 10, which includes a pilot valve body 11, a pilot valve seat assembly 12, a pilot sliding block 13, and an iron core assembly 14. The pilot valve body 11 has a pilot valve chamber 111. The pilot valve seat assembly 12 is inserted through the pilot valve body 11 and connected to the pilot valve body 11. The guide sliding block 13 is located in the guide valve cavity 111, and two ends of the guide sliding block 13 respectively abut against the inner wall of the guide valve seat assembly 12, and can slide on the guide valve seat assembly 12 along the axial direction of the guide valve body 11. The iron core assembly 14 is inserted into one end of the pilot valve body 11 and connected with the pilot valve body 11, and the iron core assembly 14 includes a movable iron core 141 and a fixed iron core 142 which are sequentially arranged along the axial direction of the iron core assembly 14. The pilot valve 10 further includes a first flow pipe 15, a second flow pipe 16 and a third flow pipe 17 penetrating through the pilot valve seat assembly 12, and the first flow pipe 15, the third flow pipe 17 and the second flow pipe 16 are located in the opposite direction of the pilot valve body 11; with the sliding of the guide slider 13, the second flow pipe 16 and the third flow pipe 17 can be communicated through the guide slider 13, or the second flow pipe 16 and the first flow pipe 15 can be communicated through the guide slider 13.

In the present application, the second flow pipe 16 is located at a position opposite to the first flow pipe 15 and the third flow pipe 17, and is communicated with the third flow pipe through the guide slider 13, and a direction of the pressure difference applied to the guide slider 13 is a direction from the peripheral side of the guide slider 13 to the central axis of the guide slider 13. Along the radial direction of the guide valve body 11, two ends of the guide sliding block 13 are in a pressure balance state, and the pressure difference force is almost zero.

Specifically, referring to fig. 4 and 5, the guide slider 13 is provided with a channel 133 penetrating through two ends of the guide slider 13, and areas of two ends of the channel 133 are equal along the axial direction of the guide slider 13. Thus, the fluid is in a pressure balanced state when flowing through the channel 133, and the pressure difference force applied to the guide slider 13 is further reduced. When the guide slide block 13 is reversed, the guide slide block is only acted by high-pressure fluid on the peripheral side of the guide slide block 13, so that the friction resistance of the guide slide block 13 in the reversing process is small, the reversing is flexible, and the risk of the guide slide block 13 being stuck is low. Meanwhile, the guide sliding block 13 has small degree of friction damage and longer service life, thereby reducing the cost of the pilot valve 10. And because the guide sliding block 13 is simple to commutate, the power of the pilot valve 10 can be reduced, and the use cost of the pilot valve 10 is further reduced.

Further, the guide slider 13 is shaped like a straight cylinder. Thus, the guide slider 13 has a simple structure and is easy to process, so that the manufacturing cost can be reduced.

Further, the thermal expansion coefficient of the pilot slider 13 is substantially equal to the thermal expansion coefficients of the pilot valve seat assembly 12 and the pilot valve body 11. Therefore, the problem that the guide sliding block 13 is blocked due to different size changes caused by different thermal expansion coefficients can be avoided, and the working performance of the pilot valve 10 is improved.

Furthermore, the material of the pilot slider 13, the pilot valve seat assembly 12 and the pilot valve body 11 is the same. Therefore, the problem that the guide sliding block 13 is blocked due to different size changes of the guide sliding block 13, the guide valve seat component 12 and the guide valve body 11 caused by different materials can be further avoided.

Referring to fig. 2, the guide valve seat assembly 12 includes a first guide valve seat 121 and a second guide valve seat 122 disposed opposite to each other, the guide slider 13 is located between the first guide valve seat 121 and the second guide valve seat 122, and two ends of the guide slider 13 respectively abut against the first guide valve seat 121 and the second guide valve seat 122.

Specifically, the first and second pilot valve seats 121 and 122 at least partially extend into the cavity of the pilot valve 10, and the connection with the capillary tube is facilitated by the arrangement of the pilot valve seat assembly 12. And the opposite side surfaces of the first pilot valve seat 121 and the second pilot valve seat 122 are planes which are arranged in parallel to each other and are respectively abutted against the guide sliding block 13, so that the guide sliding block 13 can move in the pilot valve cavity 111 conveniently, the radial deviation of the guide sliding block 13 towards the pilot valve body 11 in the movement process is avoided, and the structural stability of the pilot valve 10 is improved.

Further, the first guide valve seat 121 is provided with a first communicating hole 1211, and one end of the second flow tube 16 is inserted into the first communicating hole 1211; the second valve seat 122 has a second communication hole 1221 and a third communication hole 1222, one end of the first flow pipe 15 is inserted into the second communication hole 1221, and one end of the third flow pipe 17 is inserted into the third communication hole 1222. By opening the first communication hole 1211, the second communication hole 1221, and the third communication hole 1222, the connection with the capillary tube is facilitated, and the flow of the refrigerant in the pilot valve 10 can be realized.

The commutation of the pilot valve 10 by the slider 13 is powered by electromagnetic force generated by energizing a coil (not shown). Because the existing guide sliding block is difficult to commutate, and the sizes of the first communicating hole, the second communicating hole and the third communicating hole are generally smaller due to the limitation of coil power, the flow of a medium flowing through the pilot valve is limited, and the risk of oil sludge blockage exists.

In the present application, since the two ends of the guiding sliding block 13 are in a balanced state, the differential pressure force is almost zero, so that the guiding sliding block 13 can be made larger under the condition of limited electromagnetic force, and the first communication hole 1211, the second communication hole 1221 and the third communication hole 1222 of the guiding valve seat assembly 12 can be made larger. Therefore, the present application can significantly increase the flow rate of the pilot valve 10 without increasing the coil power, thereby increasing the commutation speed of the switching valve 100.

Referring to fig. 2, the pilot valve 10 further includes a bracket 144, one end of the bracket 144 is connected to the movable iron core 141, and the other end is sleeved on the periphery of the sliding guide 13. With the movement of the iron core 141, the bracket 144 can drive the guide slider 13 to slide on the guide valve seat assembly 12, so that the second flow pipe 16 is communicated with the third flow pipe 17 through the guide slider 13, or the second flow pipe 16 is communicated with the first flow pipe 15 through the guide slider 13.

The core assembly 14 further includes an elastic member 143, and the elastic member 143 is located between the movable core 141 and the fixed core 142, and is connected to the fixed core 142 and the movable core 141 respectively. When the coil is powered off, the movable iron core 141 moves away from the fixed iron core 142 under the action of the elastic element 143, and drives the bracket 144 and the guide slider 13 to move. When the coil is energized, under the action of electromagnetic force, the movable iron core 141 moves toward the direction close to the fixed iron core 142 against the elastic force of the elastic member 143, and drives the bracket 144 and the guide slider 13 to move, so that the guide slider 13 is reversed.

Referring to fig. 2, 4 and 5, the guide slider 13 includes a first sealing surface 131 and a second sealing surface 132. The first sealing surface 131 is located at one end of the guide slider 13 and is attached to the first guide valve seat 121; the second sealing surface 132 is located at an end of the guide slider 13 away from the first sealing surface 131 and abuts the second guide valve seat 122. Wherein the first sealing surface 131 and the second sealing surface 132 are approximately equal in size.

The first and second sealing surfaces 131 and 132 are respectively attached to the first and second pilot valve seats 121 and 122, which can enhance the sealing between the pilot slide 13 and the pilot valve seat assembly 12. Meanwhile, in actual production, due to the simple structure of the first sealing surface 131 and the second sealing surface 132, the machining precision is easier to be ensured, and the sealing performance of the guide sliding block 13 is further improved.

Referring to FIG. 2, the pilot valve 10 also includes a fourth recirculation tube 18. A fourth flow tube 18 is disposed through the end of the pilot valve body 11 remote from the core assembly 14 and is connected to the pilot valve body 11. The fourth flow pipe 18 is provided at an end of the valve body 11 to facilitate connection of the fourth flow pipe 18. Meanwhile, the fourth circulation pipe 18 is not provided to the pilot valve seat assembly 12, and the usable area of the pilot valve seat assembly 12 is larger, so that the sizes of the first communication hole 1211, the second communication hole 1221, and the third communication hole 1222 can be made larger, the flow rate of the pilot valve 10 can be increased, and the switching speed of the switching valve 100 can be increased.

On the other hand, the fourth flow pipe 18 is connected to the high pressure pipe 26 of the switching valve 100, and high pressure fluid flows through the fourth flow pipe 18, so that high pressure is generated in the pilot valve chamber 111 communicating with the fourth flow pipe 18. The second flow tube 16 is connected to the low pressure tube 24 of the switching valve 100, resulting in a low pressure in the channel 133 in the slide guide 13 communicating with the second flow tube 16. Therefore, the guide slider 13 is only acted by high-pressure fluid on the peripheral side of the guide slider 13, and the guide slider 13 is easy to reverse.

Referring to fig. 1 and fig. 6, the present application further provides a switching valve 100 including a main valve 20 and the pilot valve 10. The main valve 20 includes a valve body 21 and a piston assembly 22 movable within the valve body 21. The pilot valve 10 is connected with a main valve 20, and the pilot valve 10 is capable of controlling movement of a piston assembly 22 within a valve body 21.

In one embodiment, the switching valve 100 further includes a first connection pipe 23, a low pressure pipe 24, a second connection pipe 25, and a high pressure pipe 26. The pressure in the high-pressure pipe 26 is large. The low-pressure pipe 24 has a small pressure inside the pipe. The valve body 21 of the main valve 20 has a valve chamber 211 therein, the valve chamber 211 includes a first chamber 2111 and a second chamber 2112, and the first chamber 2111 and the second chamber 2112 are respectively located at two sides of the piston assembly 22. The second flow pipe 16 is respectively communicated with the pilot valve 10 and the low pressure pipe 24. The fourth circulation pipe 18 is respectively communicated with the pilot valve 10 and the high-pressure pipe 26. The first flow pipe 15 communicates with the pilot valve 10 and the first chamber 2111, respectively. The third flow pipe 17 is respectively communicated with the pilot valve 10 and the second chamber 2112.

The pilot valve 10 is powered on or off by the control coil, so that a pressure difference is formed between two sides of the piston assembly 22, and the piston assembly 22 is pushed to move, so as to communicate the first connecting pipe 23 with the low-pressure pipe 24, or communicate the low-pressure pipe 24 with the second connecting pipe 25.

Referring to fig. 2 and 6, when the pilot valve 10 applies high pressure to the second chamber 2112 and applies low pressure to the first chamber 2111, the pilot slider 13 communicates the second flow tube 16 with the first flow tube 15, and the fourth flow tube 18 communicates with the third flow tube 17 through the pilot valve chamber 111. At this time, the high-pressure fluid in the high-pressure pipe 26 flows into the second chamber 2112 through the fourth flow pipe 18, the valve chamber 111, and the third flow pipe 17 in this order, and the high pressure is formed in the second chamber 2112. The fluid in the first chamber 2111 flows into the low-pressure pipe 24 through the path of the first flow tube 15, the passage 133, and the second flow tube 16, and the pressure in the first chamber 2111 is low. Under the action of the differential pressure, the piston assembly 22 moves and communicates the first connection pipe 23 with the low pressure pipe 24, and the high pressure pipe 26 communicates with the second connection pipe 25 through the valve chamber 211.

Referring to fig. 3 and 7, when the pilot valve 10 applies a low pressure to the second chamber 2112 and applies a high pressure to the first chamber 2111, the pilot slider 13 communicates the second flow tube 16 with the third flow tube 17, and the fourth flow tube 18 communicates with the first flow tube 15 through the pilot chamber 111. At this time, the high-pressure fluid in the high-pressure pipe 26 flows into the first chamber 2111 through the fourth flow pipe 18, the valve chamber 111, and the first flow pipe 15 in this order, and the high pressure is formed in the first chamber 2111. The fluid in the second chamber 2112 flows into the low-pressure pipe 24 through the third flow pipe 17, the passage 133, and the second flow pipe 16, and the pressure in the second chamber 2112 is low. Under the action of the pressure difference, the piston assembly 22 is reversed and communicated with the second connecting pipe 25 and the low-pressure pipe 24, and the high-pressure pipe 26 and the first connecting pipe 23 are communicated through the valve cavity 211.

The switching valve 100 of the present application is able to more quickly reverse the piston assembly 22 by using the pilot valve 10 described above, thereby more quickly switching operating modes. Meanwhile, due to the fact that the reversing speed is increased, abnormal noise caused by the action of the fluid due to the fact that the reversing speed of the switching valve 100 is low can be avoided.

In use, when it is desired to increase the throughput of the main valve 20, it is often desirable to use a higher power specification for the pilot valve 10. By adopting the pilot valve 10 provided by the present application, the main valve 20 with a large flux can still be driven by using the pilot valve 10 with the same specification, thereby reducing the cost of the switching valve 100.

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

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. A pilot valve, comprising:

a valve guide body (11) having a valve guide chamber (111);

the pilot valve seat assembly (12) penetrates through the pilot valve body (11) and is connected with the pilot valve body (11);

the guide sliding block (13) is positioned in the guide valve cavity (111), two ends of the guide sliding block (13) are respectively abutted against the inner wall of the guide valve seat assembly (12), and the guide sliding block can slide on the guide valve seat assembly (12) along the axial direction of the guide valve body (11);

the iron core assembly (14) penetrates through one end of the valve guide body (11) and is connected with the valve guide body (11), and the iron core assembly (14) comprises a movable iron core (141) and a fixed iron core (142) which are sequentially arranged along the axial direction of the iron core assembly (14);

the pilot valve further comprises a first flow pipe (15), a second flow pipe (16) and a third flow pipe (17) which penetrate through the pilot valve seat assembly (12), and the first flow pipe (15), the third flow pipe (17) and the second flow pipe (16) are located in the opposite direction of the pilot valve body (11);

with the sliding of the guide sliding block (13), the second through pipe (16) and the third through pipe (17) can be communicated through the guide sliding block (13), or the second through pipe (16) and the first through pipe (15) can be communicated through the guide sliding block (13).

2. The pilot valve as claimed in claim 1, wherein the pilot valve seat assembly (12) comprises a first pilot valve seat (121) and a second pilot valve seat (122) which are oppositely arranged, the pilot block (13) is located between the first pilot valve seat (121) and the second pilot valve seat (122), and two ends of the pilot block (13) are respectively abutted against the first pilot valve seat (121) and the second pilot valve seat (122).

3. The pilot valve as claimed in claim 2, wherein the first pilot valve seat (121) is opened with a first communicating hole (1211), and one end of the second flow pipe (16) is inserted into the first communicating hole (1211); the second guide valve seat (122) is provided with a second communication hole (1221) and a third communication hole (1222), one end of the first flow pipe (15) is inserted into the second communication hole (1221), and one end of the third flow pipe (17) is inserted into the third communication hole (1222).

4. A pilot valve according to claim 2, wherein the guide slide (13) comprises:

the first sealing surface (131) is positioned at one end of the guide sliding block (13) and is attached to the first guide valve seat (121);

the second sealing surface (132) is positioned at one end, away from the first sealing surface (131), of the guide sliding block (13) and is attached to the second guide valve seat (122);

wherein the first sealing surface (131) and the second sealing surface (132) are approximately equal in size.

5. The pilot valve according to claim 1, wherein the guide sliding block (13) is provided with a channel (133) penetrating through two ends of the guide sliding block (13), and the areas of two ends of the channel (133) are equal along the axial direction of the guide sliding block (13).

6. A pilot valve according to claim 1, characterised in that the guide slide (13) is straight tubular in shape.

7. A pilot valve as claimed in claim 1, further comprising:

and the fourth circulating pipe (18) penetrates through one end, far away from the iron core assembly (14), of the valve guide body (11) and is connected with the valve guide body (11).

8. A pilot valve according to claim 1, characterised in that the coefficient of thermal expansion of the guide slide (13) is substantially equal to the coefficient of expansion of the guide valve seat and the guide valve body (11).

9. A pilot valve as claimed in claim 1, wherein the pilot slide (13), the pilot valve seat assembly (12) and the pilot valve body (11) are of the same material.

10. A switching valve, comprising:

a main valve (20), the main valve (20) comprising a valve body (21) and a piston assembly (22) movable within the valve body (21);

a pilot valve according to any one of claims 1 to 9, connected to said main valve (20) and capable of controlling the movement of said piston assembly (22) within said valve body (21).

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