Valve structure and electronic expansion valve

Abstract

A valve structure and an electronic expansion valve. The valve structure comprises a valve seat (10) and a sealing plug (20), wherein the valve seat (10) is provided with a valve port (11) therein, and the sealing plug (20) can move so as to change the distance between the sealing plug (20) and the valve port (11); an accommodating groove (21) is formed on the side surface of one end of the sealing plug (20), and a sealing gasket (22) is provided within the accommodating groove (21); a sealing groove (221) is formed on the end face of the sealing gasket (22) away from the valve port (11), and a sealing ring (222) is provided within the sealing groove (221), the sealing ring (222) abutting against the groove wall of the accommodating groove (21); and a protrusion (14) is provided on the inner wall of the valve port (11).

Description

Valve structure and electronic expansion valve

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 202520209225.1, filed on February 10, 2025, and entitled "Valve structure and electronic expansion valve", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of fluid control, in particular to a valve structure and an electronic expansion valve. BACKGROUND

[0004] Valves are devices used to control the direction, pressure and flow of fluids in fluid systems, including electronic expansion valves, solenoid valves, ball valves, stop valves, etc. When the valve is closed, it is usually necessary to block the valve port, therefore, a sealing gasket is usually provided on the blocking cylinder, the sealing gasket cooperates with the protrusions on the inner wall of the valve port to seal the valve port, and a sealing ring is provided on the sealing gasket to prevent the medium from entering the valve port from the gap between the sealing gasket and the blocking cylinder. If the contact point position between the protrusions and the sealing gasket is not appropriate, the pressure on the sealing gasket will be uneven, causing the sealing gasket to bend, thereby affecting the sealing effect of the sealing ring. SUMMARY

[0005] Therefore, it is necessary to provide a valve structure and an electronic expansion valve that can effectively enhance the sealing effect of the valve port.

[0006] The present application provides a valve structure, comprising a valve seat and a blocking cylinder, the valve seat has a valve port therein, and the blocking cylinder is movable to change the distance between the blocking cylinder and the valve port; a containing groove is formed in the side surface of one end of the blocking cylinder, a sealing gasket is arranged in the containing groove, a sealing groove is formed in the end surface of the sealing gasket away from the valve port, a sealing ring is arranged in the sealing groove, the sealing ring abuts against the groove wall of the containing groove, the inner wall of the valve port is provided with protrusions, when closed, the sealing gasket abuts against the protrusions, the distance between the abutting point of the sealing ring and the containing groove and the contact point between the sealing gasket and the protrusions in the direction perpendicular to the axis of the valve port is defined as D, and the distance D between the contact point between the sealing gasket and the protrusions is less than or equal to 1.5 mm.

[0007] In this way, the bending of the sealing gasket can be avoided, so as to ensure the sealing performance of the sealing ring.

[0008] In one of the embodiments, the sealing gasket is annular, the inner wall of the sealing groove has oppositely arranged first and second sides, the first side is close to the outer side of the sealing gasket, the second side is close to the inner side of the sealing gasket, the distance between the first side and the outer side of the sealing gasket is defined as d1, the distance between the second side and the inner side of the sealing gasket is defined as d2, and the distance d1 between the first side and the outer side of the sealing gasket and the distance d2 between the second side and the inner side of the sealing gasket satisfy the following relationship: d1=d2≥1.5mm.

[0009] In this way, the installation stability of the sealing ring in the sealing groove can be improved, and the sealing gasket can be fully abutted against the protrusion.

[0010] In one of the embodiments, the depth of the sealing groove is defined as H, and the depth H of the sealing groove is greater than or equal to 2.5mm.

[0011] It can be understood that a certain groove depth can ensure the stability of the installation of the sealing ring.

[0012] In one of the embodiments, the groove depth of the accommodating groove is defined as h1, and the thickness of the sealing gasket is defined as t, and the groove depth h1 of the accommodating groove and the thickness t of the sealing gasket satisfy the following relationship: h1-t≥0.2mm.

[0013] In this way, the sealing ring can be smoothly installed in the accommodating groove.

[0014] In one of the embodiments, the protrusion is annular and coaxially arranged with the sealing ring, one end of the protrusion close to the sealing gasket is in the form of a circular arc, the radius of the circular arc is defined as R, and the radius R of the circular arc is greater than or equal to the radius of the sealing ring.

[0015] In this way, the abutment of the protrusion against the sealing gasket is more uniform, so that the bending of the sealing gasket is avoided, and the one end of the protrusion with a larger radius can more stably abut against the sealing gasket, further improving the stability of the sealing gasket.

[0016] In one of the embodiments, the side surface of the plugging cylinder extends towards the direction of the protrusion to form a baffle, the baffle at least partially covers the slot opening of the accommodating groove, and the baffle abuts against at least part of the outer side of the sealing gasket, so that the plugging cylinder at least partially wraps the sealing gasket.

[0017] In this way, the installation stability of the sealing gasket can be improved, and the sealing gasket can be prevented from being separated from the accommodating groove due to the washing of the medium.

[0018] In one of the embodiments, the blocking cylinder comprises a positioning sleeve and a valve head, the valve head is connected to one end of the positioning sleeve close to the valve port, the valve head is provided with a first step, the first step and the positioning sleeve form the accommodating groove, and the sealing ring abuts against the positioning sleeve.

[0019] In one of the embodiments, the valve structure is provided with a balance channel, one end of the balance channel is located at one end of the blocking cylinder close to the valve port and communicates with the valve port, and the balance channel is provided with a filter screen close to the one end of the valve port.

[0020] In this way, not only can the medium be prevented from entering the balance channel, but also the filter screen can be prevented from being blocked.

[0021] In one of the embodiments, the inner wall of the balance channel is provided with a mounting bracket, the filter screen is mounted in the balance channel through the mounting bracket, and the mounting bracket at least partially wraps the filter screen; the inner wall of the balance channel is provided with a second step and an inclined surface, one end of the mounting bracket abuts against the second step, and the other end is provided with a necking portion, and the outer side surface of the necking portion of the mounting bracket abuts against the inclined surface to axially limit the filter screen.

[0022] In this way, the stability of the filter screen can be ensured.

[0023] The application further provides an electronic expansion valve comprising the valve structure, the electronic expansion valve further comprises a coil assembly, a guide sleeve and a screw rod, one end of the guide sleeve extends into the valve seat and is sealingly connected with the valve seat, the blocking cylinder is slidingly connected with the guide sleeve, the coil assembly is arranged at one end of the guide sleeve away from the valve seat, one end of the screw rod is connected with the coil assembly, and the other end is connected with the blocking cylinder, the coil assembly drives the screw rod to rotate to drive the blocking cylinder to move.

[0024] The valve structure provided by the application can avoid the bending of the sealing gasket by setting the distance between the abutment point of the sealing gasket and the accommodating groove and the contact point between the sealing gasket and the protrusion to be less than or equal to 1.5 mm, so that the sealing gasket can effectively abut against the groove wall of the accommodating groove, thereby avoiding the leakage of the medium. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the application, and other accompanying drawings can be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a structural schematic diagram of a valve structure and a nut seat provided by the present application.

[0027] Fig. 2 is an enlarged view of a portion of Fig. 1.

[0028] Fig. 3 is a sectional view of an electronic expansion valve.

[0029] Reference signs: 1000, electronic expansion valve; 100, valve structure; 10, valve seat; 11, valve port; 12, first port; 13, second port; 14, protrusion; 20, blocking cylinder; 21, accommodating groove; 22, sealing gasket; 221, sealing groove; 2211, first side; 2212, second side; 222, sealing ring; 23, positioning sleeve; 24, valve head; 241, first step; 25, baffle; 30, balance passage; 31, filter screen; 32, mounting frame; 321, necking; 33, second step; 34, inclined surface; 200, nut seat; 300, screw rod; 400, guide sleeve; 500, coil assembly. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be 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. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It should be noted that the specific embodiments of the present application can be implemented in hardware, software, or a combination thereof.

[0031] It should be noted that when an element is referred to as being "connected to" or "fixed to" another element, it can be directly connected to or fixed to the other element or intervening elements can be present. When an element is referred to as being "connected to" or "fixed to" another element, it can be directly connected to or fixed to the other element or intervening elements can be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions as used herein are for the purpose of illustration only and do not indicate or imply absolute orientation.

[0032] In addition, the terms "first", "second", and the like, do not denote any quantity or importance, but are used to distinguish one element from another, and the terms "first", "second", etc. can be understood as "one", "two", etc. according to the context. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless specifically defined and limited otherwise, a first feature "on", "under", "above" or "over" a second feature can be that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature "on", "above" or "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" or "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0034] Unless otherwise defined, all technical and scientific terms used in the present application 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 present application. The use of the terms "and / or" in the description of the present application includes any and all combinations of one or more of the associated listed items.

[0035] Referring to FIG. 1, the present application provides a valve structure 100 applied to a fluid system for flow control or shut-off, which can be an electronic expansion valve 1000, a solenoid valve or a stop valve, etc.

[0036] Specifically, the valve structure 100 includes a valve seat 10 and a blocking cylinder 20, the valve seat 10 has a valve port 11 therein, and the blocking cylinder 20 can slide to change the distance between the blocking cylinder 20 and the valve port 11, so as to adjust the opening degree of the valve port 11, and the blocking cylinder 20 can also block the valve port 11.

[0037] The valve seat 10 is further provided with a first port 12 and a second port 13, the first port 12 and the second port 13 are communicated through the valve port 11, and the first port 12 and the second port 13 serve as the inflow and outflow of the medium.

[0038] The side surface of one end of the blocking cylinder 20 is provided with a receiving groove 21, the receiving groove 21 is provided with a sealing gasket 22, the inside of the valve port 11 is provided with a protrusion 14, when the valve structure 100 is closed, the sealing gasket 22 abuts against the valve port 11, the end surface of the sealing gasket 22 away from the valve port 11 is provided with a sealing groove 221, the sealing groove 221 is provided with a sealing ring 222, the sealing ring 222 abuts against the inner wall of the receiving groove 21, and the sealing ring 222 is used to seal the gap between the sealing gasket 22 and the blocking cylinder 20, so as to prevent the medium from leaking from the gap between the sealing gasket 22 and the blocking cylinder 20.

[0039] Please refer to Figures 1 and 2. The contact point between the sealing ring 222 and the wall of the receiving groove 21 is defined as e1, and the contact point between the sealing gasket 22 and the protrusion 14 is defined as e2. The distance between the contact point e1 between the sealing ring 222 and the wall of the receiving groove 21 and the contact point e2 between the sealing gasket 22 and the protrusion 14 is defined as D. The distance D between the contact point e1 between the sealing ring 222 and the wall of the receiving groove 21 and the contact point e2 between the sealing gasket 22 and the protrusion 14 is less than or equal to 1.5 mm. It is understood that if the distance between the contact point e1 between the sealing ring 222 and the wall of the receiving groove 21 and the contact point e2 between the sealing gasket 22 and the protrusion 14 is too large, the sealing gasket 22 will bend due to uneven stress, affecting the sealing performance between the sealing ring 222 and the sealing cylinder 20. The distance D between the contact point e1 between the sealing ring 222 and the groove wall of the receiving groove 21 and the contact point e2 between the sealing gasket 22 and the protrusion 14 can be 0mm, 0.5mm, 1mm, 1.2mm, 1.5mm or any other value between 0mm and 1.5mm. The contact point e2 between the sealing gasket 22 and the protrusion 14 can be located to the left of the contact point e1 between the sealing ring 222 and the groove wall of the receiving groove 21, or it can be located to the right of the contact point e1 between the sealing ring 222 and the groove wall of the receiving groove 21. It should be explained that the contact point e1 between the sealing ring 222 and the groove wall of the receiving groove 21 is the point on the sealing ring 222 that is farthest from the protrusion 14. During the process of the sealing ring 222 sealing the groove wall of the receiving groove 21, it is the point that first comes into contact with the sealing groove 221. The contact point e2 between the sealing gasket 22 and the protrusion 14 is the point on the protrusion 14 that is closest to the sealing ring 222. During the process of the valve structure 100 closing, it is the point that first comes into contact with the sealing gasket 22. The distance here refers to the distance along the direction perpendicular to the axis of the valve port 11. Since the sealing ring 222, the sealing gasket 22 and the protrusion 14 are all annular, the contours of the contact point e1 between the sealing ring 222 and the groove wall of the receiving groove 21 and the contact point e2 between the sealing gasket 22 and the protrusion 14 are both circular arcs.

[0040] Both the sealing gasket 22 and the protrusion 14 are annular to ensure a complete seal.

[0041] The protrusion 14 is coaxially arranged with the sealing ring 222. The end of the protrusion 14 near the sealing gasket 22 is arc-shaped, and the radius of the arc is defined as R. The radius R of the arc is greater than or equal to the radius of the sealing ring 222. It can be understood that the coaxial arrangement of the protrusion 14 and the sealing ring 222 results in a more uniform contact point between the protrusion 14 and the sealing gasket 22, thus preventing the sealing gasket 22 from bending. Furthermore, the larger radius of the protrusion 14 allows for more stable contact with the sealing gasket 22, further enhancing the stability of the sealing gasket 22.

[0042] The sealing groove 221 is also annular, with a first side and a second side arranged opposite to each other on its inner wall. The first side is close to the outer side of the sealing gasket 22, and the second side is close to the inner side of the sealing gasket 22. The distance between the first side and the outer side of the sealing gasket 22 is defined as d1, and the distance between the second side and the inner side of the sealing gasket 22 is defined as d2. The distance d1 between the first side and the outer side of the sealing gasket 22 and the distance d2 between the second side and the inner side of the sealing gasket 22 satisfy the following relationship: d1=d2≥1.5mm. That is, by placing the sealing ring 222 at the center of the end face of the sealing gasket 22, the width of the sealing gaskets 22 on both sides is ensured to be consistent, and the sealing gasket 22 has a certain width. This not only enhances the installation stability of the sealing ring 222 in the sealing groove 221, but also ensures that the sealing gasket 22 can fully abut against the protrusion 14. d1 and d2 can be any other value greater than 1.5mm, 1.6mm, 2mm, or 1.5mm.

[0043] The groove depth of the sealing groove 221 is defined as H. The groove depth H of the sealing groove 221 is greater than or equal to 2.5mm. It can be seen that a certain groove depth can ensure the stability of the sealing ring 222 during installation. H can be any value of 2.5mm, 2.8mm, 3mm or greater than 2.5mm.

[0044] The groove depth of the receiving groove 21 is defined as h1, and the thickness of the sealing gasket 22 is defined as t1. The groove depth h1 of the receiving groove 21 and the thickness t of the sealing gasket 22 satisfy the following relationship: h1-t ≥ 0.2 mm. It is understood that the sealing ring 222 protrudes relative to the sealing gasket 22. If the thickness of the sealing gasket 22 is too large, the sealing ring 222 will not be able to be installed in the receiving groove 21. The difference h1-t between the groove depth h1 of the receiving groove 21 and the thickness t of the sealing gasket 22 can be any value greater than 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, or 0.2 mm.

[0045] The outer side of the plugging cylinder 20 extends toward the valve port 11 to form a baffle 25. The baffle 25 at least partially covers the opening of the receiving groove 21. The outer side of the sealing gasket 22 at least partially abuts against the baffle 25, so that the plugging cylinder 20 at least partially encloses the sealing gasket 22.

[0046] The sealing cylinder 20 includes a positioning sleeve 23 and a valve head 24. The valve head 24 is connected to one end of the positioning sleeve 23 near the valve port 11. The valve head 24 is provided with a first step 241. The first step 241 and the positioning sleeve 23 form a receiving groove 21. The sealing ring 222 abuts against the positioning sleeve 23.

[0047] The width of the end of the positioning sleeve 23 near the valve port 11 is greater than the width of the end of the valve head 24 near the positioning sleeve 23, thereby forming a receiving groove 21. The outer diameter of the groove wall of the receiving groove 21 near the valve port 11 is smaller than the inner diameter of the valve port 11. The end face of the sealing gasket 22 near the valve port 11 can leak out from the receiving groove 21 and abut against the protrusion 14.

[0048] The valve structure 100 has a balancing channel 30. One end of the balancing channel 30 is located near the valve port 11 of the sealing cylinder 20 and is connected to the valve port 11. The balancing channel 30 is used to balance the pressure difference inside the valve. A filter screen 31 is provided at the end of the balancing channel 30 near the valve port 11. The filter screen 31 protrudes towards the valve port 11. The filter screen 31 can filter out impurities and prevent impurities from entering the balancing channel 30 and affecting the normal operation of other parts. During long-term operation, impurities will accumulate on the outer surface of the protruding part of the filter screen 31. When the valve is opened, the medium will flush away the impurities and prevent the filter screen 31 from becoming clogged.

[0049] The inner wall of the balance channel 30 is provided with a mounting bracket 32, and the filter screen 31 is installed through the mounting bracket 32.

[0050] The mounting bracket 32 ​​partially covers the filter screen 31 to enhance the stability of the installation.

[0051] The inner wall of the balance channel 30 is provided with a second step 33. One end of the mounting bracket 32 ​​abuts against the second step 33 to limit the filter screen 31, so as to ensure that a part of the filter screen 31 protrudes out of the valve head 24.

[0052] The inner wall of the balance channel 30 has an inclined surface 34. The inclined surface 34 is set close to the second opening 13 relative to the second step 33. One end of the mounting bracket 32 ​​is provided with a narrow opening 321. The outer side of the narrow opening of the mounting bracket 32 ​​abuts against the inclined surface 34. The inclined surface 34 is used to limit the mounting bracket 32 ​​to a lower position, and the narrow opening is used to limit the filter screen 31 to a lower position.

[0053] The mounting bracket 32 ​​and the inclined surface 34 are interference-fitted to prevent impurities from entering the balance channel 30 through the gap between the mounting bracket 32 ​​and the inclined surface 34.

[0054] Please refer to Figure 3. This application also provides an electronic expansion valve 1000, which includes the valve structure 100 described above.

[0055] The electronic expansion valve 1000 includes a nut seat 200, a screw 300, a guide sleeve 400, and a coil assembly 500. One end of the guide sleeve 400 extends into the valve seat 10 and is sealed to the valve seat 10. The plugging cylinder 20 is slidably connected to the guide sleeve 400 and can slide along the guide sleeve 400. The coil assembly 500 is located at the end of the guide sleeve 400 away from the valve seat 10. The nut seat 200 is connected to the plugging cylinder 20. One end of the screw 300 is threaded to the nut seat 200, and the other end passes through the plugging cylinder 20 and the guide sleeve 400 and is connected to the coil assembly 500. The coil assembly 500 drives the screw 300 to rotate, and the nut seat 200 is circumferentially limited by the plugging cylinder 20, so that the nut seat 200 drives the plugging cylinder 20 to move axially.

[0056] When the valve is closed, the protrusion 14 abuts against the sealing gasket 22. At the same time, the medium enters from the receiving groove 21, while the sealing ring 222 blocks the medium, thereby sealing the valve port 11. The deviation between the sealing point of the protrusion 14 and the sealing gasket 22 and the sealing point of the sealing ring 222 and the groove wall of the receiving groove 21 is set to be small, which can effectively ensure the sealing effect of the sealing ring 222.

[0057] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of protection claimed in this application.

Claims

1. A valve structure comprising a valve seat and a blocking cylinder, the valve seat having a valve port therein, the blocking cylinder being movable to change the distance between the blocking cylinder and the valve port; a receiving groove is formed in the side of one end of the blocking cylinder, a sealing pad is arranged in the receiving groove, a sealing groove is formed in the end face of the sealing pad away from the valve port, a sealing ring is arranged in the sealing groove, the sealing ring abuts against the groove wall of the receiving groove, the inner wall of the valve port is provided with a protrusion, when closed, the sealing pad abuts against the protrusion, the distance between the abutting point of the sealing ring and the receiving groove and the contact point of the sealing pad and the protrusion along the direction perpendicular to the axis of the valve port is defined as D, D is less than or equal to 1.5 mm. characterized in that The sealing pad is annular, the inner wall of the sealing groove has oppositely arranged first and second side faces, the first side face is close to the outer side face of the sealing pad, the second side face is close to the inner side face of the sealing pad, the distance between the first side face and the outer side face of the sealing pad is defined as d1, the distance between the second side face and the inner side face of the sealing pad is defined as d2, the distance d1 between the first side face and the outer side face of the sealing pad and the distance d2 between the second side face and the inner side face of the sealing pad satisfy the following relationship: d1 = d2 ≥ 1.5 mm.

2. The valve structure of claim 1, wherein, The depth of the sealing groove is defined as H, the depth H of the sealing groove is greater than or equal to 2.5 mm.

3. The valve structure of claim 1, wherein, The groove depth of the receiving groove is defined as h1, the thickness of the sealing pad is defined as t, the groove depth h1 of the receiving groove and the thickness t of the sealing pad satisfy the following relationship: h1 - t ≥ 0.2 mm.

4. The valve structure of claim 1, wherein, The protrusion is annular and coaxially arranged with the sealing ring, one end of the protrusion close to the sealing pad is in the shape of a circular arc, the radius of the circular arc is defined as R, the radius R of the circular arc is greater than or equal to the radius of the sealing ring.

5. The valve structure of claim 1, wherein, The side face of the blocking cylinder extends towards the direction of the protrusion to form a baffle, the baffle at least partially covers the groove opening of the receiving groove, the baffle abuts against at least part of the outer side face of the sealing pad, so that the blocking cylinder at least partially wraps the sealing pad.

6. The valve structure of claim 1, wherein, The blocking cylinder comprises a positioning sleeve and a valve head, the valve head is connected to one end of the positioning sleeve close to the valve port, the valve head is provided with a first step, the first step and the positioning sleeve form the receiving groove, and the sealing ring abuts against the positioning sleeve.

7. The valve structure of claim 1, wherein, The valve structure has a balance channel therein, one end of the balance channel is located at one end of the blocking cylinder close to the valve port and communicates with the valve port, a filter screen is arranged in the balance channel close to the valve port, and the filter screen is protrudingly arranged towards the direction of the valve port.

8. The valve structure of claim 1, wherein, The inner wall of the balance channel is provided with a mounting bracket, the filter screen is mounted in the balance channel through the mounting bracket, and the mounting bracket at least partially wraps the filter screen; the inner wall of the balance channel has a second step and an inclined surface, one end of the mounting bracket abuts against the second step, and the other end is provided with a necking portion, and the outer side face of the necking portion of the mounting bracket abuts against the inclined surface to axially position the filter screen.

9. The valve structure of claim 8, wherein, ​ 10. An electronic expansion valve characterized by The valve structure of any one of claims 1-9, further comprising a coil assembly, a guide sleeve and a screw rod, one end of the guide sleeve extending into the valve seat and being sealingly connected with the valve seat, the blocking cylinder being slidingly connected with the guide sleeve, the coil assembly being arranged at one end of the guide sleeve away from the valve seat, one end of the screw rod being connected with the coil assembly and the other end being connected with the blocking cylinder, the coil assembly driving the screw rod to rotate so as to drive the blocking cylinder to move.

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