Valve structure and electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control, in particular to a valve structure and an electronic expansion valve. A valve structure comprises a valve seat and a plugging barrel, a valve port is formed in the valve seat, and the plugging barrel can move to change the distance between the plugging barrel and the valve port; a containing groove is formed in the side face of one end of the plugging barrel, a sealing gasket is arranged in the containing groove, a sealing groove is formed in the end face, away from the valve port, of the sealing gasket, a sealing ring is arranged in the sealing groove and abuts against the groove wall of the containing groove, and a protrusion is arranged on the inner wall of the valve port. The sealing gasket abuts against the protrusion, the distance between the abutting point of the sealing ring and the containing groove and the contact point of the sealing gasket and the protrusion in the direction perpendicular to the axis of the valve port is D, and D is smaller than or equal to 1.5 mm. The sealing ring has the advantages that the sealing gasket can be prevented from being bent and inclined, so that the sealing performance of the sealing ring is ensured.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, and in particular to a valve structure and an electronic expansion valve. Background Technology

[0002] Valves are devices used in fluid systems to control the direction, pressure, and flow rate of fluids. They include electronic expansion valves, solenoid valves, ball valves, and gate valves. When a valve is closed, the valve port usually needs to be sealed. Therefore, a sealing gasket is typically placed on the sealing sleeve. The sealing gasket works with a protrusion on the inner wall of the valve port to seal it. A sealing ring is placed on the sealing gasket to prevent the medium from entering the valve port through the gap between the sealing gasket and the sealing sleeve. However, if the contact point between the protrusion and the sealing gasket is not properly positioned, it can lead to uneven pressure on the sealing gasket, causing it to bend and affecting the sealing effect of the sealing ring. Utility Model Content

[0003] In view of this, it is necessary to provide a valve structure and an electronic expansion valve that can effectively enhance the sealing effect of the valve port.

[0004] This utility model provides a valve structure, including a valve seat and a sealing cylinder. The valve seat has a valve port, and the sealing cylinder is movable to change the distance between the sealing cylinder and the valve port. A receiving groove is formed on the side of one end of the sealing cylinder, and a sealing gasket is provided in the receiving groove. A sealing groove is formed on the end face of the sealing gasket away from the valve port, and a sealing ring is provided in the sealing groove. The sealing ring abuts against the groove wall of the receiving groove. A protrusion is provided on the inner wall of the valve port. When closed, the sealing gasket abuts against the protrusion. The distance between the abutment point of the sealing ring and the receiving groove, and the contact point between the sealing gasket and the protrusion, along the direction perpendicular to the axis of the valve port, is D, where D≤1.5mm.

[0005] This design prevents the gasket from bending or tilting, thus ensuring the sealing performance of the sealing ring.

[0006] In one embodiment, the sealing gasket is annular, and the inner wall of the sealing groove has a first side and a second side disposed opposite to each other. The first side is close to the outer side of the sealing gasket, and 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 d1, and the distance between the second side and the inner side of the sealing gasket is d2, where d1 = d2 ≥ 1.5 mm.

[0007] This design not only enhances the installation stability of the sealing ring within the sealing groove, but also ensures that the sealing gasket can fully contact the protrusion.

[0008] In one embodiment, the depth of the sealing groove is H, where H ≥ 2.5 mm.

[0009] Understandably, a certain groove depth can ensure the stability of the sealing ring installation.

[0010] In one embodiment, the depth of the receiving groove is h1, and the thickness of the sealing gasket is t, where h1-t≥0.2mm.

[0011] This design allows the sealing ring to be easily installed into the receiving groove.

[0012] In one embodiment, the protrusion is annular and coaxially arranged with the sealing ring, and the end of the protrusion near the sealing gasket is a circle with a radius of R, where R is greater than or equal to the radius of the sealing ring.

[0013] This design ensures more even contact between the protrusion and the gasket, preventing the gasket from bending. Furthermore, the larger radius of the protrusion allows for more stable contact with the gasket, further enhancing its stability.

[0014] In one embodiment, the side of the sealing cylinder extends toward the protrusion to form a baffle, the baffle at least partially obscuring the opening of the receiving groove, and the baffle abutting against at least a portion of the outer side of the sealing gasket, so that the sealing cylinder at least partially encloses the sealing gasket.

[0015] This design enhances the installation stability of the gasket and prevents it from detaching from the receiving groove due to erosion by the medium.

[0016] In one embodiment, the sealing cylinder includes a positioning sleeve and a valve head, the valve head being connected to one end of the positioning sleeve near the valve port, the valve head having a first step, the first step and the positioning sleeve forming the receiving groove, and the sealing ring abutting against the positioning sleeve.

[0017] In one embodiment, the valve structure has a balancing channel, one end of which is located near the valve port of the sealing cylinder and connected to the valve port. A filter screen is provided at the end of the balancing channel near the valve port, and the filter screen protrudes towards the valve port.

[0018] This setup not only prevents media from entering the balance channel, but also prevents the filter from becoming clogged.

[0019] In one embodiment, the inner wall of the balancing channel is provided with a mounting bracket, and the filter screen is installed in the balancing channel through the mounting bracket. The mounting bracket at least partially covers the filter screen. The inner wall of the balancing channel has a second step and an inclined surface. One end of the mounting bracket abuts against the step, and the other end is narrowed. The outer side of the narrowed part of the mounting bracket abuts against the inclined surface to limit the axial movement of the filter screen.

[0020] This setup ensures the stability of the filter installation.

[0021] This utility model also provides an electronic expansion valve, including the valve structure described above. The electronic expansion valve further includes a coil assembly, a guide sleeve, and a screw. One end of the guide sleeve extends into the valve seat and is sealed to the valve seat. The sealing cylinder is slidably connected to the guide sleeve. The coil assembly is located at the end of the guide sleeve away from the valve seat. One end of the screw is connected to the coil assembly, and the other end is connected to the sealing cylinder. The coil assembly drives the screw to rotate, thereby moving the sealing cylinder.

[0022] The valve structure provided by this utility model sets the distance between the contact point of the sealing ring and the receiving groove and the contact point between the sealing gasket and the protrusion to ≤1.5mm, which can prevent the sealing gasket from bending and ensure that the sealing ring can effectively abut against the groove wall of the receiving groove, thereby preventing media leakage. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the valve structure and nut seat provided by this utility model;

[0025] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 3 This is a cross-sectional view of an electronic expansion valve.

[0027] Reference numerals: 1000, Electronic expansion valve; 100, Valve structure; 10, Valve seat; 11, Valve port; 12, First port; 13, Second port; 14, Protrusion; 20, Sealing cylinder; 21, Receiving groove; 22, Sealing gasket; 221, Sealing groove; 222, Sealing ring; 23, Positioning sleeve; 24, Valve head; 241, First step; 25, Baffle; 30, Balancing channel; 31, Filter screen; 32, Mounting bracket; 33, Second step; 34, Inclined surface; 200, Nut seat; 300, Screw; 400, Guide sleeve; 500, Coil assembly. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can 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 through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figure 1This utility model provides a valve structure 100, which is applied in a fluid system for flow control or shut-off. The valve can be an electronic expansion valve 1000, a solenoid valve, or a shut-off valve, etc.

[0034] Specifically, the valve structure 100 includes a valve seat 10 and a plugging cylinder 20. The valve seat 10 has a valve port 11. The plugging cylinder 20 can slide to change the distance between the plugging cylinder 20 and the valve port 11 to adjust the opening degree of the valve port 11. The plugging cylinder 20 can also block the valve port 11.

[0035] The valve seat 10 is also provided with a first port 12 and a second port 13. The first port 12 and the second port 13 are connected through the valve port 11. The first port 12 and the second port 13 serve as the inflow and outflow of the medium.

[0036] A receiving groove 21 is provided on the side of one end of the sealing cylinder 20. A sealing gasket 22 is provided in the receiving groove 21. A protrusion 14 is provided inside the valve port 11. When the valve structure 100 is closed, the sealing gasket 22 abuts against the valve port 11. A sealing groove 221 is provided on the end face of the sealing gasket 22 away from the valve port 11. A sealing ring 222 is provided in the sealing groove 221. The sealing ring 222 abuts against the inner wall of the receiving groove 21. The sealing ring 222 is used to seal the gap between the sealing gasket 22 and the sealing cylinder 20 to prevent the medium from leaking from the gap between the sealing gasket 22 and the sealing cylinder 20.

[0037] Please see Figure 1 and Figure 2 The contact point between the sealing ring 222 and the groove wall of the receiving groove 21 is e1, and the contact point between the sealing gasket 22 and the protrusion 14 is e2. The distance between e1 and e2 is D, where D ≤ 1.5 mm. It is understandable that if the distance between e1 and e2 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. D can be 0 mm, 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, or any other value between 0 mm and 1.5 mm. e2 can be located to the left or right of e1. It should be explained that e1 is the point on the sealing ring 222 that is farthest from the protrusion 14, and the point that first comes into contact with the sealing groove 221 during the process of the sealing ring 222 sealing the groove wall of the receiving groove 21. e2 is the point on the protrusion 14 that is closest to the sealing ring 222, and the point that first comes into contact with the sealing gasket 22 during the process of the valve structure 100 closing. 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, e1 and e2 are both circular arcs.

[0038] Both the sealing gasket 22 and the protrusion 14 are annular to ensure a complete seal.

[0039] The protrusion 14 is coaxially arranged with the sealing ring 222. The end of the protrusion 14 near the sealing gasket 22 is a circle with a radius of R, where R is greater than or equal to the radius of the sealing ring 222. It is 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 its stability.

[0040] 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 d1, and the distance between the second side and the inner side of the sealing gasket 22 is d2, where d1 = d2 ≥ 1.5 mm. That is, the sealing ring 222 is positioned at the center of the end face of the sealing gasket 22, ensuring that the widths of the sealing gaskets 22 on both sides are consistent and that the sealing gasket 22 has a certain width. This not only enhances the installation stability of the sealing ring 222 within 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 1.5 mm, 1.6 mm, 2 mm, or 1.5 mm.

[0041] The groove depth of the sealing groove 221 is H, and H satisfies ≥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.

[0042] The groove depth of the receiving groove 21 is h1, and the thickness of the sealing gasket 22 is t1, where 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 fit into the receiving groove 21. h1-t can be any other value greater than 0.2 mm, such as 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, or 0.2 mm.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The mounting bracket 32 ​​partially covers the filter screen 31 to enhance the stability of the installation.

[0049] 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.

[0050] 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 narrowed. The outer side of the narrowed part 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 narrowed part is used to limit the filter screen 31 to a lower position.

[0051] 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.

[0052] Please see Figure 3 The present invention also provides an electronic expansion valve 1000, which includes the valve structure 100 described above.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A valve structure, comprising a valve seat (10) and a plugging cylinder (20), wherein the valve seat (10) has a valve port (11) and the plugging cylinder (20) is movable to change the distance between the plugging cylinder (20) and the valve port (11); Its features are, The sealing cylinder (20) has a receiving groove (21) on one side. A sealing gasket (22) is provided in the receiving groove (21). A sealing groove (221) is provided on the end face of the sealing gasket (22) away from the valve port (11). A sealing ring (222) is provided in the sealing groove (221). The sealing ring (222) abuts against the groove wall of the receiving groove (21). The inner wall of the valve port (11) has a protrusion (14). When closed, the sealing gasket (22) abuts against the protrusion (14). Along the direction perpendicular to the axis of the valve port (11), the distance between the abutment point of the sealing ring (222) and the receiving groove (21) and the contact point of the sealing gasket (22) and the protrusion (14) is D, where D≤1.5mm.

2. The valve structure according to claim 1, characterized in that, The sealing gasket (22) is annular, and the inner wall of the sealing groove (221) has a first side and a second side arranged opposite to each other. 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 d1, and the distance between the second side and the inner side of the sealing gasket (22) is d2, where d1 = d2 ≥ 1.5 mm.

3. The valve structure according to claim 1, characterized in that, The depth of the sealing groove (221) is H, where H ≥ 2.5 mm.

4. The valve structure according to claim 1, characterized in that, The groove depth of the receiving groove (21) is h1, and the thickness of the sealing gasket (22) is t, where h1-t≥0.2mm.

5. The valve structure according to claim 1, characterized in that, The protrusion (14) is annular and coaxially arranged with the sealing ring (222). The end of the protrusion (14) near the sealing gasket (22) is a circle with a radius of R, where R is greater than or equal to the radius of the sealing ring (222).

6. The valve structure according to claim 1, characterized in that, The side of the sealing cylinder (20) extends toward the protrusion (14) to form a baffle (25), the baffle (25) at least partially covers the opening of the receiving groove (21), and the baffle (25) abuts against at least part of the outer side of the sealing gasket (22) so that the sealing cylinder (20) at least partially covers the sealing gasket (22).

7. The valve structure according to claim 1, characterized in that, 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 the receiving groove (21). The sealing ring (222) abuts against the positioning sleeve (23).

8. The valve structure according to claim 1, characterized in that, The valve structure has a balance channel (30), one end of which is located near the valve port (11) of the sealing cylinder (20) and connected to the valve port (11). A filter screen (31) is provided at the end of the balance channel (30) near the valve port (11), and the filter screen (31) protrudes towards the valve port (11).

9. The valve structure according to claim 8, characterized in that, The inner wall of the balance channel (30) is provided with a mounting bracket (32), and the filter screen (31) is installed in the balance channel (30) through the mounting bracket (32). The mounting bracket (32) at least partially covers the filter screen (31). The inner wall of the balance channel (30) has a second step (33) and an inclined surface (34). One end of the mounting bracket (32) abuts against the step, and the other end is narrowed. The outer side of the narrowed part of the mounting bracket (32) abuts against the inclined surface (34) to limit the axial movement of the filter screen (31).

10. An electronic expansion valve, characterized in that, The electronic expansion valve includes the valve structure described in any one of claims 1-9, further comprising a coil assembly (500), a guide sleeve (400), and a screw (300). 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). The coil assembly (500) is located at the end of the guide sleeve (400) away from the valve seat (10). One end of the screw (300) is connected to the coil assembly (500), and the other end is connected to the plugging cylinder (20). The coil assembly (500) drives the screw (300) to rotate, thereby moving the plugging cylinder (20).

Images