Valve structure

Abstract

A valve structure, comprising a valve body (100), a valve core (200), and a sealing ring (300). The valve body (100) has a valve cavity (110); the valve cavity (110) is provided with a valve port (101); the valve core (200) is movably arranged in the valve cavity (110), and is used for adjustably sealing the valve port; a sealing groove (210) is formed in the valve core (200) in the circumferential direction; the sealing ring (300) is at least partially arranged in the sealing groove (210); and the part of the sealing ring (300) exposed out of the sealing groove (210) is in sealing fit with the valve port. A cavity is formed between the sealing groove (210) and the sealing ring (300); a balance channel is formed in the valve core (200); one end of the balance channel is communicated with the cavity, and the other end of the balance channel is communicated with the space outside the valve core (200) and in the valve body (100). The direction of the fluid acting force received by the part of the sealing ring (300) exposed out of the sealing groove (210) is opposite to that of the fluid acting force at the cavity received by the sealing ring (300). The valve structure can reduce or avoid the deformation of the sealing ring (300).

Description

Valve structure

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority based on Chinese application No. 202311396678.1 filed on October 25, 2023, Chinese application No. 202322879771.X filed on October 25, 2023, Chinese application No. 202322053165.2 filed on August 1, 2023, and Chinese application No. 202322056487.2 filed on August 1, 2023, and all or part of their contents are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of valve technology, and in particular to a valve structure. Background Art

[0004] Existing valve structures have a sealing ring around the valve core, which seals the valve core against the valve opening of the valve body. However, when the valve core moves with the valve structure, or when the valve core is closed, high-pressure fluid entering the valve cavity acts on the sealing ring on the valve core, squeezing the sealing ring and causing compression deformation, which can lead to serious internal leakage in the valve structure.

[0005] Public content

[0006] A main purpose of the present disclosure is to overcome at least one of the above-mentioned defects of the prior art and provide a valve structure that is not prone to internal leakage problems.

[0007] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] According to one aspect of the present disclosure, a valve structure is provided, including a valve body, a valve core and a sealing ring, the valve body having a valve cavity, the valve cavity having a valve port, the valve core movably arranged in the valve cavity, and used for adjustably sealing the valve port, the valve core is circumferentially provided with a sealing groove, the sealing ring is at least partially arranged in the sealing groove, and the portion of the sealing ring exposed in the sealing groove is sealed with the valve port; wherein, a cavity is formed between the sealing groove and the sealing ring, a balancing channel is provided in the valve core, one end of the balancing channel is connected to the cavity, and the other end is connected to the space in the valve body outside the valve core; wherein, the force of the fluid acting on the portion of the sealing ring exposed in the sealing groove is opposite to the direction of the force of the fluid acting on the sealing ring in the cavity.

[0009] According to one embodiment of the present disclosure, wherein: the sealing groove has an upper groove wall, the cavity includes a first cavity formed between the upper groove wall and the upper surface of the sealing ring, the balancing channel includes a first balancing channel, and the first balancing channel is connected to the first cavity and the area of ​​the valve cavity located above the sealing ring; and / or, the sealing groove has a lower groove wall, the cavity includes a second cavity formed between the lower groove wall and the lower surface of the sealing ring, the balancing channel includes a second balancing channel, and the second balancing channel is connected to the second cavity and the area of ​​the valve cavity located below the sealing ring.

[0010] According to one embodiment of the present disclosure, the sealing groove has the upper groove wall and the lower groove wall, and the balancing channel includes the first balancing channel and the second balancing channel; wherein, in the radial direction of the valve body, the width of the upper groove wall is greater than the width of the lower groove wall, and the width of the opening of the first balancing channel on the upper groove wall is greater than or equal to the width of the opening of the second balancing channel on the lower groove wall.

[0011] According to one embodiment of the present disclosure, the sealing groove has the upper groove wall, and the balancing channel includes the first balancing channel; wherein, the valve core is provided with at least two first balancing channels, and at least two first balancing channels are evenly arranged along the circumference of the valve core.

[0012] According to one embodiment of the present disclosure, the sealing groove has the lower groove wall, and the balancing channel includes the second balancing channel; wherein, the lower groove wall is provided with at least two second balancing channels, and the at least two second balancing channels are evenly spaced along the circumference of the valve core.

[0013] According to one embodiment of the present disclosure, the sealing groove has the upper groove wall, and the balancing channel includes the first balancing channel, wherein: the first balancing channel is a through hole; or, the first balancing channel is a through groove, and the plane where the upper groove wall is located is used as the reference plane, and on the reference plane, the orthographic projection of the through groove is arc-shaped.

[0014] According to one embodiment of the present disclosure, the sealing groove has the lower groove wall, and the balancing channel includes the second balancing channel, wherein: the second balancing channel is a through hole; or, the second balancing channel is a through groove, with the plane where the lower groove wall is located as the reference plane, and on the reference plane, the orthographic projection of the through groove is arc-shaped.

[0015] According to one embodiment of the present disclosure, the sealing groove has the upper groove wall, and the cavity includes the first cavity; wherein, the upper surface of the sealing ring is provided with a first groove, and the first groove and the upper groove wall together form the first cavity.

[0016] According to one embodiment of the present disclosure, a first groove is provided on the upper surface of the sealing ring, the first groove is in a closed circular shape, and each of the first balancing channels is arranged to overlap with the first groove.

[0017] According to one embodiment of the present disclosure, the sealing groove has the lower groove wall, and the cavity includes the second cavity; wherein, a second groove is opened on the upper surface of the sealing ring, and the second groove and the lower groove wall together form the second cavity.

[0018] According to one embodiment of the present disclosure, a second groove is provided on the lower surface of the sealing ring, the second groove is in a closed circular shape, and each of the second balancing channels is arranged to overlap with the second groove.

[0019] According to one embodiment of the present disclosure, the valve core is an integrated structure.

[0020] According to one embodiment of the present disclosure, the valve core includes a piston and a compression sleeve, the compression sleeve is connected to the lower end of the piston, the piston is circumferentially provided with a first boss, the compression sleeve is circumferentially provided with a second boss, and the first boss and the second boss are axially spaced apart; wherein, the space between the first boss and the second boss forms the sealing groove, the lower surface of the first boss is the upper groove wall of the sealing groove, and the upper surface of the second boss is the lower groove wall of the sealing groove.

[0021] It can be seen from the above technical solutions that the advantages and positive effects of the valve structure proposed in this disclosure are:

[0022] The valve structure proposed in the present disclosure includes a valve body, a valve core and a sealing ring. The valve core is provided with a sealing groove in the circumferential direction. The sealing ring is at least partially disposed in the sealing groove. A cavity is formed between the sealing groove and the sealing ring. A balancing channel is provided in the valve core. One end of the balancing channel is connected to the cavity, and the other end is connected to the valve cavity. Through the above design, the present disclosure can use the balancing channel to divert the fluid in the valve cavity to the upper and / or lower part of the sealing ring. As a result, the sealing ring is squeezed toward both sides along the circumferential direction in the area of ​​the sealing ring near the valve port under the action of the drainage pressure, so that the outer area of ​​the sealing ring resists the squeezing caused by the pressure difference, so that the force on the sealing ring tends to be balanced, which is conducive to reducing or avoiding the deformation of the sealing ring and improving the sealing performance of the valve structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic perspective view of a valve structure according to an exemplary embodiment;

[0024] FIG2 is an axial sectional view of the valve structure shown in FIG1 ;

[0025] FIG3 is an enlarged schematic diagram of portion A in FIG2 ;

[0026] FIG4 is a schematic diagram of the force identification of FIG3;

[0027] FIG5 is a schematic diagram of the three-dimensional structure of the valve core shown in FIG2;

[0028] FIG6 is a perspective exploded schematic diagram of the valve core shown in FIG5 ;

[0029] FIG7 is an axial side cross-sectional view of the valve core shown in FIG5;

[0030] FIG8 and FIG9 are schematic diagrams of the three-dimensional structure of the sealing ring shown in FIG2 at two different viewing angles;

[0031] FIG10 is an exploded perspective view of a valve core of a valve structure according to another exemplary embodiment;

[0032] FIG11 is an axial side cross-sectional view of a valve core of a valve structure according to another exemplary embodiment;

[0033] 12 and 13 are partial enlarged cross-sectional views of valve structures according to two other exemplary embodiments;

[0034] FIG14 is a partially enlarged schematic diagram of an axial cross-sectional structure of a valve structure according to another exemplary embodiment;

[0035] FIG15 is a schematic perspective structural diagram of the valve core of the valve structure shown in FIG14;

[0036] FIG16 is an exploded perspective view of the valve core shown in FIG15 ;

[0037] 17 to 21 are partial cross-sectional views of valve structures according to several other exemplary embodiments.

[0038] 22 is a cross-sectional view of a valve structure according to another exemplary embodiment, in which a valve needle spring is in a natural state;

[0039] FIG23 is a schematic structural diagram of the valve needle spring in the natural state in the valve structure shown in FIG22;

[0040] FIG24 is a cross-sectional view of the valve structure shown in FIG22 with the valve needle spring in a compressed state;

[0041] FIG25 is a schematic structural diagram of the valve needle spring in the valve structure shown in FIG22 in a compressed state;

[0042] FIG26 is a cross-sectional view of a valve structure according to another exemplary embodiment, wherein a valve needle spring is in a natural state;

[0043] FIG27 is a schematic structural diagram of the valve needle spring in the natural state in the valve structure shown in FIG26;

[0044] FIG28 is a cross-sectional view of the valve structure shown in FIG26 with the valve needle spring in a compressed state;

[0045] FIG29 is a schematic structural diagram of the valve needle spring in the valve structure shown in FIG26 in a compressed state.

[0046] The description of the accompanying drawings is as follows:

[0047] 100. Valve body; 101. Valve port; 110. Valve cavity; 200. Valve core; 201. Piston; 2011. First boss; 2012. Step structure; 202. Press sleeve; 2021. Second boss; 203. Boss; 204. First positioning structure; 210. Sealing groove; 211. Upper groove wall; 212. Lower groove wall; 221. First balancing channel; 222. Second balancing channel; 300. Sealing ring; 301. First surface; 302. Second surface; 303. Second positioning structure; 310. First groove; 320. Second groove; f1. Extrusion pressure; f2. Extrusion pressure; f3. Extrusion pressure; C1. First cavity; C2. Second cavity; S1. Area; S2. Area; W1. Width; W2. Width; W 3. Width; W4. Width; X. Axial direction; 10a. Valve housing; 11a. Accommodating chamber; 12a. Valve port; 13a. Valve seat; 14a. Valve body; 15a. Valve cover; 20a. Nut sleeve; 21a. First through hole; 211a. Threaded section; 212a. Guide section; 30a. Screw; 40a. Valve core; 41a. Spring sleeve; 42a. Main body; 421a. Connecting end; 4211a. Connecting protrusion; 422a. Sealing end; 423a. Annular recess; 424a. Annular sealing ring; 43a. Bearing; 44a. Connecting piece; 45a. Buffer spring; 50a. Valve needle spring; 60a. Guide ring; 70a. Accommodating structure; 71a. First accommodating groove; 711a. Guide portion; 712a. Accommodating portion. DETAILED DESCRIPTION

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0049] Referring to FIG1 , a representative perspective view of the valve structure proposed in the present disclosure is shown. In this exemplary embodiment, the valve structure proposed in the present disclosure is described using a valve structure for a vehicle thermal management system as an example. Those skilled in the art will readily appreciate that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of the present disclosure to valve structures of other types or application scenarios. These modifications remain within the scope of the principles of the valve structure proposed in the present disclosure.

[0050] As shown in FIG1 , in one embodiment of the present disclosure, the valve structure proposed in the present disclosure includes a valve body 100, a valve core 200, and a sealing ring 300. The valve body 100 has a valve cavity 110, and the valve cavity 110 has a valve port. For example, taking the structures shown in FIG1 and FIG2 as an example, when the valve port is located at the lower end of the valve structure, the valve port can be understood as the lower end of the valve cavity 110, that is, the valve cavity 110 is located above the valve port. The valve core 200 is movably disposed in the valve cavity 110 and can move up and down axially in the valve cavity 110 to adjustably seal the valve port. The valve core 200 has a sealing groove 210 circumferentially defined therein. The sealing ring 300 is at least partially disposed in the sealing groove 210. The portion of the sealing ring 300 exposed in the sealing groove 210 seals against the valve port. For example, when the valve structure is in a closed valve port state, the portion of the sealing ring 300 exposed in the sealing groove 210 abuts against the wall of the valve cavity 110. With reference to Figures 2 to 9, Figure 2 is a representative axial sectional view of the valve structure; Figure 3 is a representative enlarged schematic diagram of portion A in Figure 2; Figure 4 is a schematic diagram of the force identification in Figure 3; Figure 5 is a representative three-dimensional structural diagram of the valve core 200; Figure 6 is a representative three-dimensional exploded schematic diagram of the valve core 200; Figure 7 is a representative axial sectional view of the valve core 200; Figures 8 and 9 are representative three-dimensional structural diagrams of the sealing ring 300 from two different perspectives. The following, in conjunction with the above-mentioned figures, describes in detail the structure, connection method, and functional relationship of the main components of the valve structure proposed in the present disclosure.

[0051] As shown in Figures 1 to 3, in one embodiment of the present disclosure, a cavity is formed between the sealing groove 210 and the sealing ring 300. A balancing channel is defined within the valve core 200, one end of which is connected to the cavity, and the other end of which is connected to the valve cavity 110 of the valve body 100. Accordingly, the force exerted on the sealing ring 300 by the fluid directed into the cavity comprises an outward extrusion force, and the force exerted on the outer periphery of the sealing ring 300 by the fluid within the valve cavity 110 comprises an inward extrusion force. These outward extrusion forces and the inward extrusion forces act in opposite directions and at least partially offset each other. Through the above design, the present disclosure can utilize the balancing channel to drain the fluid in the valve cavity 110 to the cavity formed between the sealing groove 210 and the sealing ring 300, thereby causing the sealing ring 300 to be squeezed circumferentially toward both sides in the area of ​​the sealing ring 300 close to the valve port under the action of the drainage pressure, so that the outer area of ​​the sealing ring 300 resists the squeezing caused by the pressure difference, and makes the force on the sealing ring 300 tend to be balanced, which is beneficial to reduce or avoid deformation of the sealing ring 300 and improve the sealing performance of the valve structure.

[0052] As shown in Figures 1 to 3, in one embodiment of the present disclosure, the sealing groove 210 has an upper groove wall 211 and a lower groove wall 212 arranged opposite each other. The cavity includes a first cavity C1 and a second cavity C2. The first cavity C1 is formed between the upper groove wall 211 and the upper surface of the sealing ring 300, and the second cavity C1 is formed between the lower groove wall 212 and the lower surface of the sealing ring 300. The balancing channel includes a first balancing channel 221 and a second balancing channel 222. The first balancing channel 221 connects the first cavity C1 with the area of ​​the valve cavity 110 above the sealing ring 300. Specifically, one end of the first balancing channel 221 opens to the upper groove wall 211, and the other end opens to the area on the surface of the valve core 200 above the sealing groove 210, thereby communicating with the space within the valve body 100 outside the valve core 200 (e.g., the area of ​​the valve cavity 110 above the valve core 200). The second balancing channel 222 connects the second cavity C2 and the area of ​​the valve cavity 110 below the sealing ring 300. Specifically, one end of the second balancing channel 222 opens at the lower groove wall 212, and the other end opens at the area on the surface of the valve core 200 below the sealing groove 210, thereby communicating with the space within the valve body 100 outside the valve core 200 (e.g., the area of ​​the valve cavity 110 below the valve core 200, or the valve port). Consequently, the force exerted by the fluid on the portion of the sealing ring 300 exposed in the sealing groove 210 (see the extrusion force f1 shown in FIG. 4 ) is in the opposite direction to the force exerted by the fluid on the sealing ring 300 in the cavity (see the extrusion forces f2 and f3 shown in FIG. 4 ). Through the above design, the present disclosure can utilize the first balancing channel 221 and the second balancing channel 221 to achieve drainage of the upper and lower parts of the sealing ring 300, thereby further improving the resistance of the outer area of ​​the sealing ring 300 to the pressure difference, making the force on the sealing ring 300 more balanced, further reducing or avoiding the deformation of the sealing ring 300, and further improving the sealing performance of the valve structure.

[0053] Specifically, as shown in Figure 4, Figure 4 specifically shows the force applied to the sealing ring 300 when the area above the sealing ring 300 of the valve chamber 110 is a high-pressure area, wherein the outer side of the sealing ring 300 is subjected to the above-mentioned pressure differential force and is subjected to an inward extrusion force f1. Due to the presence of the first balancing channel 221, the middle area of ​​the sealing ring 300 (for example, the upper surface) is subjected to an outward extrusion force f2 due to the pressure of the drainage. Due to the presence of the second balancing channel 222, the middle area of ​​the sealing ring 300 (for example, the lower surface) is subjected to an outward extrusion force f3 due to the pressure of the drainage. At this time, the extrusion force f2 and the extrusion force f1 on the inner and outer sides of the area S1 at the top of the sealing ring 300 at least partially offset each other, and the extrusion force f3 and the extrusion force f1 on the inner and outer sides of the area S2 at the bottom of the sealing ring 300 at least partially offset each other, so that the forces on the sealing ring 300 in the areas S1 and S2 tend to be balanced, thereby avoiding deformation of the sealing ring 300 or reducing the deformation of the sealing ring 300. In some embodiments, the area of ​​the valve chamber 110 below the sealing ring 300 may also be a high-pressure area. At this time, the outer periphery of the sealing ring 300 will also be subjected to an inward extrusion pressure, and a portion of the fluid is diverted through the balance channel to the cavity between the sealing ring 300 and the sealing groove 210. The outward extrusion pressure generated can at least partially offset the inward extrusion force, thereby avoiding deformation of the sealing ring 300 or reducing the deformation of the sealing ring 300.

[0054] As shown in FIG7 , in one embodiment of the present disclosure, in the radial direction of the valve body 100 (e.g., the horizontal direction in the figure), the width W1 of the opening of the first balancing channel 221 on the upper groove wall 211 can account for 1 / 10 to 1 / 2 of the width W2 of the upper groove wall 211, such as 1 / 10, 1 / 8, 1 / 5, 1 / 3, 1 / 2, etc. This design prevents the first balancing channel 221 from accounting for an excessively large portion of the opening width on the upper groove wall 211, leaving sufficient contact area between the upper groove wall 211 and the upper surface of the sealing ring 300, thereby ensuring the sealing effect of the sealing ring 300. Furthermore, the present disclosure prevents the first balancing channel 221 from accounting for an excessively small portion of the opening width on the upper groove wall 211. This ensures that the first balancing channel 221 provides sufficient drainage, thereby providing sufficient extrusion force in the central region of the upper surface of the sealing ring 300 to offset the extrusion force from the outside, further alleviating deformation of the sealing ring 300. In some embodiments, the width W1 of the opening of the first balancing channel 221 on the upper groove wall 211 may account for less than 1 / 10 of the width W2 of the upper groove wall 211, or may be greater than 1 / 2, such as 10 / 101, 51 / 100, etc., and is not limited to this embodiment.

[0055] As shown in FIG7 , in one embodiment of the present disclosure, in the radial direction of the valve body 100 (e.g., the horizontal direction in the figure), the width W3 of the second balancing channel 222 opening on the lower groove wall 212 can account for 1 / 10 to 1 / 2 of the width W4 of the upper groove wall 211, such as 1 / 10, 1 / 8, 1 / 5, 1 / 3, 1 / 2, etc. This design prevents the second balancing channel 222 from accounting for too large a proportion of the opening width on the lower groove wall 212, leaving sufficient area for contact between the lower groove wall 212 and the lower surface of the sealing ring 300, thereby ensuring the sealing effect of the sealing ring 300. Furthermore, the present disclosure prevents the second balancing channel 222 from accounting for too small a proportion of the opening width on the lower groove wall 212, thereby ensuring that the second balancing channel 222 provides sufficient drainage and, therefore, sufficient extrusion force in the central region of the lower surface of the sealing ring 300 to offset the extrusion force from the outside, further alleviating deformation of the sealing ring 300. In some embodiments, the width W3 of the opening of the second balancing channel 222 on the lower groove wall 212 may account for less than 1 / 10 of the width W4 of the lower groove wall 212, or may be greater than 1 / 2, such as 10 / 101, 51 / 100, etc., and is not limited to this embodiment.

[0056] As shown in Figure 7, in one embodiment of the present disclosure, in the radial direction of the valve body 100, the width W2 of the upper groove wall 211 is greater than the width W4 of the lower groove wall 212. For example, the sealing groove 210 may have a trapezoidal cross-sectional shape in an axial cross-sectional view. Based on this, the width W1 of the opening of the first balancing channel 221 in the upper groove wall 211 may be greater than or equal to the width W3 of the opening of the second balancing channel 222 in the lower groove wall 212. This design allows the present disclosure to more evenly distribute the extrusion pressure exerted on the upper and lower sides of the sealing ring 300 due to the drainage of the balancing channel, further preventing deformation of the sealing ring 300.

[0057] The valve core 200 may be provided with at least one first balancing channel 221. In some embodiments, the valve core 200 may also be provided with at least two first balancing channels 221. As shown in Figures 5 and 6, in one embodiment of the present disclosure, the valve core 200 may be provided with four first balancing channels 221, and these first balancing channels 221 are evenly spaced along the circumference of the valve core 200. Through the above design, the present disclosure can make the extrusion force generated by the drainage of the first balancing channel 221 on the upper part of the sealing ring 300 more balanced in the circumferential direction, further avoiding deformation of the sealing ring 300. In some embodiments, the valve core 200 may also be provided with two, three, five or more first balancing channels 221, and is not limited to this embodiment.

[0058] The valve core 200 may be provided with at least one second balancing channel 222. In some embodiments, the valve core 200 may also be provided with at least two second balancing channels 222. As shown in FIG6 , in one embodiment of the present disclosure, the valve core 200 may be provided with eight second balancing channels 222, and these second balancing channels 222 are evenly spaced along the circumference of the valve core 200. Through the above design, the present disclosure can make the extrusion force generated by the drainage of the second balancing channels 222 on the lower part of the sealing ring 300 more balanced in the circumferential direction, further avoiding deformation of the sealing ring 300. In some embodiments, the valve core 200 may also be provided with two, three, five or more second balancing channels 222, which is not limited to this embodiment.

[0059] As shown in Figures 5 and 6 , in one embodiment of the present disclosure, the first balancing channel 221 may be a through hole, such as, but not limited to, a circular hole, an elliptical hole, a rectangular hole, etc. Through this design, the present disclosure can make the first balancing channel 221 easier to manufacture and has minimal impact on the structure of the valve core 200.

[0060] As shown in FIG6 , in one embodiment of the present disclosure, the second balancing channel 222 may be a through hole, such as, but not limited to, a circular hole, an elliptical hole, a rectangular hole, etc. Through the above design, the present disclosure can make the second balancing channel 222 easier to manufacture and has less impact on the structure of the valve core 200.

[0061] Referring to FIG. 10 , FIG. 10 representatively shows a three-dimensional structural diagram of a valve core 200 in another exemplary embodiment of a valve structure that can embody the principles of the present disclosure.

[0062] As shown in Figure 10, in one embodiment of the present disclosure, the first balancing channel 221 can be a through-groove, with the plane of the upper groove wall 211 serving as a reference plane. On this reference plane, the through-groove can be arcuate. For example, taking the sealing groove 210 as a circular ring, the arc corresponding to each through-groove can match the curvature of a segment of the corresponding circular ring of the sealing ring. This design can expand the drainage area of ​​the first balancing channel 221, optimize the squeezing effect on the central area of ​​the upper surface of the sealing ring 300, and further prevent deformation of the sealing ring 300.

[0063] As shown in Figure 10, in one embodiment of the present disclosure, the second balancing channel 222 can be a through groove, with the plane of the lower groove wall 212 serving as a reference plane. On this reference plane, the through groove can be arc-shaped. For example, taking the sealing groove 210 as a circular ring, the arc corresponding to each through groove can match the curvature of a segment of the corresponding circular ring of the sealing ring. Through this design, the present disclosure can expand the drainage area of ​​the second balancing channel 222, optimize the squeezing effect on the central area of ​​the lower surface of the sealing ring 300, and further prevent deformation of the sealing ring 300.

[0064] As shown in FIG7 , in one embodiment of the present disclosure, the valve core 200 may include a piston 201 and a compression sleeve 202. The compression sleeve 202 is connected to the lower end of the piston 201, for example, partially sleeved within the bottom opening of the piston 201. On this basis, the piston 201 is circumferentially provided with a first boss 2011, and the compression sleeve 202 is circumferentially provided with a second boss 2021. The first boss 2011 and the second boss 2021 are axially spaced apart, for example, as shown in the upper and lower spacing arrangement in the accompanying drawings. On this basis, the space between the first boss 2011 and the second boss 2021 forms the aforementioned sealing groove 210 of the valve core 200, and the lower surface of the first boss 2011 serves as the upper groove wall 211 of the sealing groove 210, while the upper surface of the second boss 2021 serves as the lower groove wall 212 of the sealing groove 210.

[0065] 11 , which representatively shows an axial cross-sectional view of a valve core 200 in another exemplary embodiment of a valve structure that can embody the principles of the present disclosure.

[0066] As shown in FIG11 , in one embodiment of the present disclosure, the valve core 200 may be an integral structure. For example, the valve core 200 may be provided with two bosses 203 spaced apart in the axial direction on the circumference of the integral structure, with the space between the two bosses 203 forming the sealing groove 210 of the valve core 200 .

[0067] As shown in Figures 3 and 8, in one embodiment of the present disclosure, a first groove 310 can be formed on the upper surface of the sealing ring 300. Accordingly, the first groove 310 and the upper groove wall 211 of the sealing groove 210 together form a first cavity C1. The opening of the first balancing channel 221 in the upper groove wall 211 at least partially overlaps with the first groove 310, thereby achieving communication between the first balancing channel 221 and the first cavity C1. Through this design, the present disclosure can utilize the first groove 310 to ensure that the upper surface of the sealing ring 300 is subjected to more sufficient extrusion force under the action of drainage.

[0068] As shown in FIG8 , based on the design of a first groove 310 defined on the upper surface of the sealing ring 300, in one embodiment of the present disclosure, the upper surface of the sealing ring 300 may have only one first groove 310 defined thereon. This first groove 310 may be in the shape of a closed annular ring, i.e., the first cavity C1 may be in the shape of a closed annular ring, and each first balancing channel 221 may overlap with the first groove 310. In some embodiments, the upper surface of the sealing ring 300 may have multiple first grooves 310 defined thereon, and the multiple first grooves 310 may be arranged correspondingly to the positions of the multiple first balancing channels 221, respectively.

[0069] Based on the design of the first groove 310 on the upper surface of the sealing ring 300, in one embodiment of the present disclosure, in the radial direction of the valve body 100 (e.g., the horizontal direction in the drawings), the width of the first groove 310 can account for 1 / 10 to 1 / 2 of the width of the upper surface of the sealing ring 300, such as 1 / 10, 1 / 8, 1 / 5, 1 / 3, 1 / 2, etc. This design prevents the first groove 310 from occupying too large a portion of the opening width of the upper surface of the sealing ring 300, leaving sufficient contact area between the upper groove wall 211 and the upper surface of the sealing ring 300, thereby ensuring the sealing effect of the sealing ring 300. In some embodiments, the width of the first groove 310 can account for less than 1 / 10 of the width of the upper surface of the sealing ring 300, or can be greater than 1 / 2, such as 10 / 101, 51 / 100, etc., without being limited to this embodiment.

[0070] As shown in Figure 3, based on the design of a first groove 310 on the upper surface of the sealing ring 300, in one embodiment of the present disclosure, the plane of the upper surface of the sealing ring 300 serves as a reference plane. On this reference plane, the orthographic projection of the opening of the first balancing channel 221 in the upper groove wall 211 can be entirely located within the first groove 310. Furthermore, the radial width of the first groove 310 can be slightly larger than the width of the opening of the first balancing channel 221 in the upper groove wall 211. Through this design, the present disclosure can ensure that the drainage of the first balancing channel 211 generates a more effective compressive force on the sealing ring 300 at the first groove 310.

[0071] As shown in Figures 3 and 9, in one embodiment of the present disclosure, a second groove 320 can be formed on the lower surface of the sealing ring 300. Accordingly, the second groove 320 and the lower groove wall 212 of the sealing groove 210 together form a second cavity C2. The opening of the second balancing channel 222 in the lower groove wall 212 at least partially overlaps with the second groove 320, thereby achieving communication between the second balancing channel 222 and the second cavity C2. Through this design, the present disclosure can utilize the second groove 320 to more effectively exert pressure on the lower surface of the sealing ring 300 during drainage.

[0072] As shown in FIG9 , based on the design of a second groove 320 defined on the lower surface of the sealing ring 300, in one embodiment of the present disclosure, the lower surface of the sealing ring 300 may have only one second groove 320 defined thereon. This second groove 320 may be in the shape of a closed annular ring, i.e., the second cavity C2 may be in the shape of a closed annular ring, and each second balancing channel 222 may overlap with the second groove 320. In some embodiments, the lower surface of the sealing ring 300 may have multiple second grooves 320 defined thereon, and the multiple second grooves 320 may be arranged correspondingly to the positions of the multiple second balancing channels 222, respectively.

[0073] Based on the design of the second groove 320 on the lower surface of the sealing ring 300, in one embodiment of the present disclosure, in the radial direction of the valve body 100 (e.g., the horizontal direction in the drawings), the width of the second groove 320 can account for 1 / 10 to 1 / 2 of the width of the lower surface of the sealing ring 300, such as 1 / 10, 1 / 8, 1 / 5, 1 / 3, 1 / 2, etc. This design prevents the second groove 320 from occupying too large a portion of the width of the lower surface of the sealing ring 300, leaving sufficient contact area between the lower groove wall 212 and the lower surface of the sealing ring 300, thereby ensuring the sealing effect of the sealing ring 300. In some embodiments, the width of the second groove 320 can account for less than 1 / 10 of the width of the lower surface of the sealing ring 300, or can be greater than 1 / 2, such as 10 / 101, 51 / 100, etc., without being limited to this embodiment.

[0074] As shown in Figure 3, based on the design of a second groove 320 defined on the lower surface of the sealing ring 300, in one embodiment of the present disclosure, the plane of the lower surface of the sealing ring 300 serves as a reference plane. On this reference plane, the orthographic projection of the opening of the second balancing channel 222 in the lower groove wall 212 can be entirely located within the second groove 320. Furthermore, the radial width of the second groove 320 can be slightly greater than the width of the opening of the second balancing channel 222 in the lower groove wall 212. Through this design, the present disclosure can ensure that the drainage of the second balancing channel 212 generates a more effective compressive force on the sealing ring 300 at the second groove 320.

[0075] 12 , a partially enlarged cross-sectional view of another exemplary embodiment of a valve structure that can embody the principles of the present disclosure is representatively shown.

[0076] As shown in FIG. 12 , in one embodiment of the present disclosure, the valve core 200 may only be provided with a first balancing channel 221 , that is, no balancing channel is provided at the second groove wall 212 of the sealing groove 210 .

[0077] 13 , a partially enlarged cross-sectional view of another exemplary embodiment of a valve structure that can embody the principles of the present disclosure is representatively shown.

[0078] As shown in FIG. 13 , in one embodiment of the present disclosure, the valve core 200 may only be provided with the second balancing channel 222 , that is, no balancing channel is provided at the first groove wall 211 of the sealing groove 210 .

[0079] As described above, in various possible implementations consistent with the design concept of the present disclosure, the valve core 200 defines a balancing channel in at least one of the first groove wall 211 and the second groove wall 212 of the sealing groove 210 .

[0080] Referring to Figures 14 to 16 , Figure 14 represents a partially enlarged schematic diagram of an axial cross-sectional view of a valve structure in another exemplary embodiment; Figure 15 represents a schematic diagram of a three-dimensional structure of a valve core 200; and Figure 16 represents an exploded three-dimensional diagram of a valve core 200. The following, in conjunction with the aforementioned figures, details the structure, connection method, and functional relationship of the major components of the valve structure proposed by the present invention.

[0081] As shown in Figures 1 to 16, in one embodiment of the present disclosure, the valve body 100 has a valve cavity and a valve port 101. The valve core 200 is movably disposed within the valve cavity of the valve body 100, and the valve core 200 is used to adjustably seal the valve port 101 of the valve body 100 (see Figure 2). The valve core 200 is circumferentially defined with a sealing groove 210. The sealing ring 300 is at least partially disposed within the sealing groove 210, and the portion of the sealing ring 300 exposed in the sealing groove 210 is in sealing engagement with the valve port 101. The sealing groove 210 has an upper groove wall 211 and a lower groove wall 212 spaced apart from each other, specifically, spaced apart along the axial direction X of the valve body 100. At least one of the upper groove wall 211 and the lower groove wall 212 is provided with a first positioning structure 204, and the first positioning structure 204 is at least one of a protrusion and a groove. Through the above-mentioned structural design, the present disclosure can utilize the first positioning structure 204 to position the sealing ring 300, specifically, it can be positioned radially, for example, thereby ensuring that the sealing ring 300 is more firmly assembled in the sealing groove 210 of the valve core 200, avoiding the risk of the sealing ring 300 loosening and falling off, and ensuring the sealing effectiveness of the valve structure.

[0082] It should be noted that the embodiments shown in Figures 14 to 16 are described using an example in which the upper groove wall 211 is provided with the first positioning structure 204, and the first positioning structure 204 is a groove. It should be understood that in some embodiments, when the upper groove wall 211 is provided with the first positioning structure 204, the first positioning structure 204 may also be a protrusion. Furthermore, regardless of whether the upper groove wall 211 is provided with the first positioning structure 204, the lower groove wall 212 may optionally be provided with the first positioning structure 204, and the first positioning structure 204 provided on the lower groove wall 212 may be a groove or a protrusion, without being limited to this embodiment.

[0083] It should be noted that when at least one of the upper groove wall 211 and the lower groove wall 212 is provided with the first positioning structure 204, since the sealing ring 300 is in a squeezed state when assembled with the sealing groove 210, if the first positioning structure 204 is a groove, a portion of the squeezed sealing ring 300 will deform and squeeze into the groove, i.e., the sealing ring 300 will generate a convex bulge corresponding to the groove, thereby achieving relative positioning of the sealing ring 300 and the sealing groove 210. Alternatively, if the first positioning structure 204 is a protrusion, the protrusion will further squeeze the sealing ring 300, and of course the corresponding surface of the sealing ring 300 (the first surface 301 or the second surface 302) will be squeezed by the protrusion to form a depression. It should be understood that the above-mentioned extrusion deformation state can be observed and understood by the cross-sectional structure represented by Figure 14, but in actual disassembly, when the sealing ring 300 is made of rubber or other materials with certain elastic recovery properties, the sealing ring 300 removed from the sealing groove 210 may not be observed to have obvious bulges or depressions, and may only be observed to have shallow convex marks or depressions, or even no obvious traces.

[0084] As shown in Figure 16, in one embodiment of the present disclosure, the first positioning structure 204 can be an annular structure. For example, in the case where the upper groove wall 211 is provided with the first positioning structure 204, and the first positioning structure 204 is a groove, the first positioning structure 204 can be an annular groove structure provided on the upper groove wall 211. This structural design further optimizes the positioning effect of the sealing ring 300 and helps reduce the processing difficulty.

[0085] Unlike the embodiment shown in FIG. 16 , in which the first positioning structure 204 is annular, in an embodiment not shown in the present disclosure, the first positioning structure 204 may include multiple positioning portions, with the multiple positioning portions belonging to the same first positioning structure 204 spaced apart along an annular path. This structural design, because the first positioning structure 204 is not a closed annular structure, allows the present disclosure to further achieve circumferential positioning of the sealing ring 300. For example, relative rotation between the sealing ring 300 and the sealing groove 210 can be prevented, further ensuring the sealing performance of the valve structure.

[0086] Based on the structural design that the first positioning structure 204 includes a plurality of positioning portions, in an embodiment not shown in the present disclosure, the positioning portions may be in an arc shape or a point shape.

[0087] 17 , a partial cross-sectional view of another exemplary embodiment of a valve structure that can embody the principles of the present disclosure is representatively shown.

[0088] Different from the embodiment shown in FIG14 in which the first positioning structure 204 includes a groove, as shown in FIG17 , in one embodiment of the present disclosure, taking the groove wall 211 provided with the first positioning structure 204 as an example, the first positioning structure 204 may include a protrusion.

[0089] 18 , a partial cross-sectional view of another exemplary embodiment of a valve structure embodying the principles of the present disclosure is representatively shown.

[0090] Unlike the embodiment shown in FIG. 14 , which employs a structural design in which the upper groove wall 211 is provided with a single first positioning structure 204, as shown in FIG. 18 , in one embodiment of the present disclosure, taking the upper groove wall 211 provided with the first positioning structure 204 as an example, the upper groove wall 211 may further be provided with at least two first positioning structures 204, such as but not limited to the two shown in the accompanying drawings, and the at least two first positioning structures 204 are radially spaced apart on the upper groove wall 211. Through this structural design, the present disclosure can further optimize the positioning effect of the sealing ring 300.

[0091] Similarly, in an embodiment not shown in the figures of the present disclosure, when the lower groove wall 212 is provided with the first positioning structure 204, the lower groove wall 212 may be further provided with at least two first positioning structures 204, and the at least two first positioning structures 204 are radially spaced apart on the lower groove wall 212. Through the above structural design, the present disclosure can further optimize the positioning effect of the sealing ring 300.

[0092] As shown in Figures 14 to 16, in one embodiment of the present disclosure, the valve core 200 may include a piston 201 and a compression sleeve 202. The piston 201 has a through hole extending along the axial direction X, and the compression sleeve 202 is sleeved on the through hole and located at one end of the piston 201 along the axial direction X. Accordingly, the piston 201 and the compression sleeve 202 together form a sealing groove 210 of the valve core 200. Through the above-mentioned structural design, the present disclosure can facilitate the compression sleeve 202 and the piston 201 to squeeze the sealing ring 300 during the assembly process, so that the sealing ring 300 more fully produces deformation that matches the first positioning structure 204, thereby further optimizing the positioning effect of the sealing ring 300 and improving the sealing effect. In some embodiments, the valve core 200 may also be an integral structure. In this case, the sealing ring 300 may also be installed in the sealing groove 210 using other methods, such as but not limited to using an interference fit (i.e., the cross-sectional diameter of the sealing ring 300 is greater than the cross-sectional width of the sealing groove 210). Of course, even if the valve core 200 adopts a structure assembled by multiple components, the sealing groove 210 can be set on only one of the components, that is, only one of the components is formed, which is not limited to this embodiment.

[0093] 19 , a partial cross-sectional view of another exemplary embodiment of a valve structure embodying the principles of the present disclosure is representatively shown.

[0094] As shown in Figure 19, based on the structural design of the sealing groove 210 formed by the piston 201 and the pressing sleeve 202 of the valve core 200, in one embodiment of the present disclosure, the piston 201 can form an upper groove wall 211, and the pressing sleeve 202 can form a lower groove wall 212 and the groove bottom of the sealing groove 210. On this basis, a step structure 2012 can be provided on the inner circumference of the piston 201 at one end facing the pressing sleeve 202. The step structure 2012 and the pressing sleeve 202 together form a groove, which is the first positioning structure 204 mentioned above.

[0095] 20 , a partial cross-sectional view of another exemplary embodiment of a valve structure embodying the principles of the present disclosure is representatively shown.

[0096] As shown in Figure 20, based on the structural design of the sealing groove 210 formed by the piston 201 and the compression sleeve 202 of the valve core 200, in one embodiment of the present disclosure, the piston 201 can form the upper groove wall 211 and the groove bottom of the sealing groove 210, and the compression sleeve 202 can form the lower groove wall 212. On this basis, the piston 201 can be provided with a groove at the position where the upper groove wall 211 is adjacent to the groove bottom. This groove is the first positioning structure 204 mentioned above.

[0097] As shown in FIG19 or FIG20 , in some embodiments of the present disclosure, the sealing ring 300 has a first surface 301 that abuts the upper groove wall 211 and a second surface 302 that abuts the lower groove wall 212. At least one of the first surface 301 and the second surface 302 may be provided with a second positioning structure 303. The second positioning structure 303 is at least one of a groove and a protrusion. The second positioning structure 303 is arranged corresponding to and engaged with the first positioning structure 204. For example, in the embodiment shown in FIG19 or FIG20 , when the upper groove wall 211 is provided with the first positioning structure 204, and the first positioning structure 204 is a groove, a protrusion may be provided on the first surface 301 of the sealing ring 300 at a position corresponding to the groove, and the protrusion of the sealing ring 300 is accommodated in the groove of the upper groove wall 211. Accordingly, the cross-section of the sealing ring 300 is generally L-shaped. Through the above-mentioned structural design, the present disclosure can further optimize the positioning effect of the sealing ring 300, and at the same time can further extend the infiltration path of the external medium when leakage occurs, thereby further improving the sealing effect.

[0098] 21 , a partial cross-sectional view of another exemplary embodiment of a valve structure embodying the principles of the present disclosure is representatively shown.

[0099] As shown in FIG21 , in one embodiment of the present disclosure, the valve body 100 comprises a valve cavity, which has a valve port 101. The valve core 200 cooperates with the valve port 101 to achieve flow regulation and sealing functions. For example, taking the structure shown in FIG1 and FIG2 as an example, when the valve port 101 is located at the lower end of the valve structure, the valve port 101 can be understood as the lower end of the valve cavity, that is, the area above the valve port 101 is the valve cavity. The upper groove wall 211 can be provided with a first balancing channel 221, which connects the sealing groove 210 and the area of ​​the valve cavity above the sealing ring 300. That is, one end of the first balancing channel 221 opens to the upper groove wall 211, and the other end opens to the area on the surface of the valve core 200 above the sealing groove 210, thereby communicating with the space within the valve body 100 outside the valve core 200 (e.g., the area of ​​the valve cavity above the valve core 200). When the upper groove wall 211 is provided with the first positioning structure 204, the opening position of the first balancing channel 221 on the upper groove wall 211 is radially spaced from the first positioning structure 204. The lower groove wall 212 is provided with a second balancing channel 222, which connects the sealing groove 210 and the area of ​​the valve cavity below the sealing ring 300. That is, one end of the second balancing channel 222 opens at the lower groove wall 212, and the other end opens at the area of ​​the piston 201 surface below the sealing groove 210, thereby connecting to the space within the valve body 100 outside the valve core 200 (e.g., the area of ​​the valve cavity below the valve core 200, such as the valve port 101). When the lower groove wall 212 is provided with the first positioning structure 204, the opening position of the second balancing channel 222 on the lower groove wall 212 is radially spaced from the first positioning structure 204. Through the above-mentioned structural design, the present invention can utilize the balanced flow channels on the upper and lower sides of the sealing groove 210 to drain the medium in the valve cavity to the upper and lower parts of the seal respectively, thereby making the sealing ring 300 subject to the drainage pressure and being squeezed circumferentially toward both sides in the area of ​​the sealing gasket close to the valve port 101, so that the outer area of ​​the sealing ring 300 resists the squeezing caused by the pressure difference, so that the force on the sealing ring 300 tends to be balanced, which is beneficial to reduce or avoid deformation of the sealing ring 300 and improve the sealing performance of the valve structure.

[0100] It should be noted that the embodiment shown in Figure 21 is described by taking as an example the case where the upper groove wall 211 and the lower groove wall 212 are each provided with a balancing flow channel. In some embodiments of the present disclosure, the valve core 200 may also provide a balancing flow channel in only one of the upper groove wall 211 and the lower groove wall 212, and is not limited to this embodiment.

[0101] As shown in Figure 21, based on the structural design of the first balancing channel 221 opened on the upper groove wall 211, in one embodiment of the present disclosure, when the upper groove wall 211 is provided with a first positioning structure 204, the first positioning structure 204 can be located on the relatively inner side of the first balancing channel 221 in the radial direction.

[0102] Similarly, based on the structural design of the second balancing channel 222 being opened in the lower groove wall 212, in an embodiment not shown in the present disclosure, when the lower groove wall 212 is provided with a first positioning structure 204, the first positioning structure 204 can be located on the relative inner side of the second balancing channel 222 in the radial direction.

[0103] As shown in Figures 22 and 24, an embodiment of the present disclosure further provides a valve structure, which includes a valve housing 10a, a nut sleeve 20a, a screw 30a, a valve core 40a, and a valve needle spring 50a. The valve housing 10a has a accommodating chamber 11a and a valve port 12a. The valve port 12a is connected to the accommodating chamber 11a. The nut sleeve 20a is disposed in the accommodating chamber 11a, and the nut sleeve 20a is fixedly connected to the valve housing 10a. The screw 30a is passed through the nut sleeve 20a and is threadedly connected to the nut sleeve 20a. The valve core 40a is connected to the screw 30a and is correspondingly disposed to the valve port 12a. The screw 30a drives the valve core 40a to block or open the valve port 12a. The valve needle spring 50a is disposed between the valve core 40a and the nut sleeve 20a. Among them, the valve needle spring 50a has a tower-shaped structure.

[0104] Since the valve needle spring 50a is a tower-shaped structure, the total height of the tower-shaped spring with the same number of turns when compressed to the limit state is lower than that of the equal-diameter spring with the same number of turns, leaving a relatively large space for the valve core 40a to move. Even if the valve core 40a rises to the maximum height (at this time, the conventional equal-diameter spring is in a compressed state), the tower-shaped spring can still be in a non-compressed state, avoiding self-locking of the screw thread 30a.

[0105] When the valve core 40a moves in a direction away from the nut sleeve 20a, the compressed valve needle spring 50a is reset under its own restoring force, so that the valve structure can continue to work again after being over-opened.

[0106] For a cylindrical spring, the diameters of both ends of the cylindrical spring along its axial direction are the same. When the cylindrical spring is compressed, the two ends of the cylindrical spring in the axial direction are close to each other and arranged directly opposite each other. Therefore, even if the cylindrical spring is compressed to the limit, the cylindrical spring still occupies a relatively large space in the axial direction. To this end, the valve needle spring 50a includes a plurality of coils that are interconnected and coaxially arranged, and the wire diameters of the plurality of coils are the same. The diameter of the second end of the valve needle spring 50a is greater than the diameter of the first end. The second end of the valve needle spring 50a can be referred to as the large end, and the first end of the valve needle spring 50a can be referred to as the small end. When the valve needle spring 50a is in a compressed state, the large end can cover the small end, and the edges of the large end and the small end are staggered, so that the height of the valve needle spring 50a when compressed to the limit is equal to the wire diameter of one of the coils.

[0107] Compared to the cylindrical spring, the needle spring 50a has a lower total height after compression, leaving more room for the valve core 40a to move freely. Accordingly, when the valve core 40a rises high enough to compress the cylindrical spring, replacing the cylindrical spring with the needle spring 50a prevents compression. Therefore, the non-compressed needle spring 50a prevents the screw threads from self-locking, ensuring proper valve operation.

[0108] In one embodiment, the second end of the valve needle spring 50a is disposed toward the nut sleeve 20a.

[0109] It can be understood that the portion of the outer wall of the nut sleeve 20a with a relatively large diameter corresponds to the valve core 40a, and the large end of the valve needle spring 50a is arranged toward the nut sleeve 20a, that is, the valve needle spring 50a is specifically a structure with a large upper end and a small lower end.

[0110] It is understandable that in some other embodiments, the first end of the valve needle spring 50a may be arranged toward the nut sleeve 20a, that is, the valve needle spring 50a is specifically a structure with a small upper end and a large lower end.

[0111] In one embodiment, as shown in Figures 22 and 23, the valve needle spring 50a includes multiple interconnected and coaxially arranged coils. The diameters of the coils vary, so that the larger coils provide space for the adjacent smaller coils to accommodate and compress, thereby reducing the overall height after compression.

[0112] In one embodiment, the diameters of the plurality of coils gradually increase or decrease along the axial direction of the valve core 40 a .

[0113] In other words, the diameters of the multiple coils increase or decrease sequentially from top to bottom, creating a gradual transition. If the diameters of the multiple coils decrease sequentially from top to bottom, when the needle spring 50a is gradually compressed, the coils located at the bottom can be accommodated within the adjacent upper coils after compression. Thus, the multiple coils can be accommodated sequentially from bottom to top without direct contact between adjacent coils. When the needle spring 50a is compressed to its limit, the multiple coils can form a concentric ring structure that is approximately coplanar, reducing the total length of the compressed coils.

[0114] In one embodiment, as shown in FIG. 24 and FIG. 25 , the wire diameters of the plurality of coils are the same; wherein the height of the valve needle spring 50 a when compressed to the limit is equal to the wire diameter of one coil.

[0115] It can be understood that the multiple coils are, from top to bottom, the first coil, the second coil, the third coil, the fourth coil, and the fifth coil, with their diameters decreasing in sequence. As the valve needle spring 50a is gradually compressed, the diameter of the fifth coil becomes slightly smaller than that of the fourth coil, allowing it to fit within the fourth coil. The diameter of the fourth coil becomes slightly smaller than that of the third coil, allowing it to fit within the third coil, until the second coil fits within the first coil. At this point, the second, third, fourth, and fifth coils are all contained within the first coil. Therefore, in the ultimate compressed state, the minimum height of the entire valve needle spring 50a along the axial direction of the valve core 40a is the height of the first coil. The wire diameters of the multiple coils are all r. Therefore, in the final compressed state, the height of the valve needle spring 50a along the axial direction of the valve core 40a is the wire diameter r of the first coil, effectively reducing the space occupied by the valve needle spring 50a in the compressed state.

[0116] In one embodiment, the valve housing 10a includes a valve seat 13a, a valve body 14a, and a valve cover 15a, which are interconnected. The valve port 12a is disposed on the valve seat 13a, at least a portion of the valve body 14a is located within the valve cover 15a, a nut sleeve 20a is connected to the valve body 14a, the nut sleeve 20a is located within the valve cover 15a, and a valve needle spring 50a is located within the valve body 14a.

[0117] The valve core 40a includes a body 42a, with the first end of the needle spring 50a abutting against it. A guide ring 60a is provided at the top of the valve body 14a, at least a portion of which is located within the nut sleeve 20a. The guide ring 60a has a radial section located between the nut sleeve 20a and the valve core 40a. The second end of the needle spring 50a abuts against the radial section, providing a position limit for the needle spring 50a.

[0118] The axial section is provided with a first sub-through hole, which connects the inner cavity of the valve housing 10a with the inner cavity of the valve body 14a, and serves as an intermediate connection.

[0119] The valve core 40 a is inserted into the guide ring 60 a , and the guide ring 60 a can guide the valve core 40 a , thereby improving the coaxiality between the valve core 40 a and the valve port 12 a .

[0120] As shown in Figures 22 and 24, the body 42a includes a connecting end 421a and a blocking end 422a, which are oppositely disposed. The connecting end 421a is connected to the spring sleeve 41a. The body 42a is positioned adjacent to the valve port 12a. The spring sleeve 41a is guided and engaged by the guide ring 60a. The valve needle spring 50a is sleeved outside the spring sleeve 41a, with one end of the valve needle spring 50a abutting the connecting end 421a. The connecting end 421a is fixedly connected to the spring sleeve 41a, and the blocking end 422a is positioned corresponding to the valve port 12a. Specifically, the connecting end 421a is provided with a connecting protrusion 4211a. The first end of the valve needle spring 50a is sleeved outside the connecting protrusion 4211a and abuts the body 42a. The connecting protrusion 4211a provides a positioning position for the valve needle spring 50a, while the body 42a provides an abutment position for the valve needle spring 50a. Specifically, the guide ring 60a further includes an axial section, and the spring sleeve 41a is guided and engaged with the axial section of the guide ring 60a. The valve needle spring 50a is sleeved outside the spring sleeve 41a. The axial section of the guide ring 60a guides the spring sleeve 41a, so that the screw 30a drives the spring sleeve 41a and the body 42a to move axially.

[0121] The connecting protrusion 4211a is inserted into the spring sleeve 41a and fixedly connected to the inner wall of the spring sleeve 41a, so that the body 42a is firmly connected to the spring sleeve 41a, thereby improving the structural stability between the body 42a and the spring sleeve 41a. The connecting protrusion 4211a and the spring sleeve 41a can be connected by welding.

[0122] Since the size of the connecting protrusion 4211 a is relatively small, the first end of the valve needle spring 50 a with a smaller diameter can be sleeved outside the connecting protrusion 4211 a .

[0123] In this embodiment, the guide ring 60a is integrated with the valve body 14a. A communication hole is provided on the guide ring 60a. The areas above and below the guide ring 60a in the accommodating cavity 11a are connected through the communication hole.

[0124] In order to reduce the driving force of the light valve opening, an annular recess 423a is provided on the outer wall of the main body 42a, and an annular sealing ring 424a is provided in the annular recess 423a. The main body 42a is sealed and cooperated with the valve body 14a through the annular sealing ring 424a, and the main body 42a has a channel connected to the valve port 12a, and the channel is also connected to the inner cavity of the valve body 14a where the valve needle spring 50a is located.

[0125] In order to connect the passage of the main body 42a with the inner cavity of the valve body 14a where the valve needle spring 50a is located, the spring sleeve 41a is provided with a second sub-through hole.

[0126] In one embodiment, a first through hole 21a is provided in the nut sleeve 20a along its axial direction. The first through hole 21a includes a threaded section 211a and a guide section 212a. The threaded section 211a is arranged away from the valve port 12a and is threadedly connected to the screw 30a.

[0127] In one embodiment, the valve core 40a further includes a bearing 43a, which is disposed within a spring housing 41a. The inner ring of the bearing 43a is sleeved and fixedly connected to the screw 30a. The inner wall of the spring housing 41a forms a clearance fit with the outer ring of the bearing 43a, and the inner wall of the spring housing 41a serves to guide the outer ring of the bearing 43a. By disposing the bearing 43a within the spring housing 41a, the inner ring of the bearing 43a rotates with the screw 30a, while the outer ring of the bearing 43a, the spring housing 41a, and the valve body 42a do not rotate with the screw 30a. This reduces friction between the outer ring of the bearing 43a, the spring housing 41a, the valve body 42a, and other components, thereby extending the service life of the entire device. The inner wall of the spring sleeve 41a is used to guide the outer ring of the bearing 43a so that the bearing 43a and the screw 30a will not be skewed when the bearing 43a moves axially with the screw 30a, thereby improving the coaxiality of the screw 30a and the valve port 12a, and further improving the coaxiality of the valve core 40a and the valve port 12a.

[0128] In one embodiment, the valve core 40a also includes a connector 44a and a buffer spring 45a arranged in sequence along the axial direction. The buffer spring 45a is arranged near the valve port 12a. The connector 44a and the buffer spring 45a are both located in the spring sleeve 41a. The connector 44a includes a first section and a second section. The second section of the connector 44a is arranged near the valve port 12a. The diameter of the first section of the connector 44a is greater than the diameter of the second section of the connector 44a. The first section of the connector 44a abuts against the outer ring of the bearing 43a. One end of the buffer spring 45a is sleeved on the outside of the second section of the connector 44a and abuts against the end face of the first section of the connector 44a. The other end of the buffer spring 45a abuts against the body 42a.

[0129] The above-described structure improves the structural stability between the connector 44a, the buffer spring 45a, and the outer ring of the bearing 43a, thereby improving the overall structural stability of the valve core 40a. The connector 44a is used to connect the buffer spring 45a and the outer ring of the bearing 43a. Optionally, a through hole is provided in the connector 44a to clear the inner ring of the bearing 43a and the screw 30a.

[0130] As shown in Figures 26 to 29, an embodiment of the present disclosure provides a valve structure, which includes a valve housing 10a, a nut sleeve 20a, a screw 30a, a valve core 40a, and a valve needle spring 50a. The valve housing 10a is provided with a accommodating chamber 11a and a valve port 12a, the valve port 12a is connected to the accommodating chamber 11a, the nut sleeve 20a is arranged in the accommodating chamber 11a, and the nut sleeve 20a is fixedly connected to the valve housing 10a. The screw 30a is inserted into the nut sleeve 20a and is threadedly connected to the nut sleeve 20a. The valve core 40a is connected to the screw 30a and is arranged corresponding to the valve port 12a. The screw 30a drives the valve core 40a to block or open the valve port 12a. The valve needle spring 50a is arranged between the valve core 40a and the nut sleeve 20a.

[0131] Specifically, the valve housing 10a has an accommodating chamber 11a and a valve port 12a, the nut sleeve 20a is arranged in the accommodating chamber 11a, the screw 30a is threadedly connected to the nut sleeve 20a, the screw 30a is connected to the valve core 40a and the screw 30a drives the valve core 40a to block or open the valve port 12a, and the valve needle spring 50a is arranged between the valve core 40a and the nut sleeve 20a. By adopting the above structure, the valve needle spring 50a can keep the upper side surfaces of the threads of the screw 30a and the nut sleeve 20a always in contact with each other, or always keep the lower side surfaces of the threads of the screw 30a in contact with each other during the upward and downward movement of the screw 30a relative to the nut sleeve 20a, and the position of the screw 30a relative to the nut sleeve 20a is not affected by the thread gap, and the degree to which the valve core 40a opens the valve port 12a is not affected by the thread gap, thereby avoiding the different degrees to which the valve core 40a opens the valve port 12a when the screw 30a moves to the same position during the upward and downward movement of the screw 30a, thereby improving the flow control accuracy of the valve structure.

[0132] However, if the valve core rises to the maximum limit height, the valve core will compress the valve needle spring to the limit state. The valve needle spring in the limit state exerts a huge force on the valve core, causing the screw thread to self-lock under the spring force and unable to rotate, resulting in the valve structure not being able to work normally.

[0133] As shown in Figures 26 to 29, in order to solve this problem, the valve structure provided in this embodiment also includes a accommodating structure 70a. The accommodating structure 70a is arranged on the side of the valve core 40a close to the nut sleeve 20a, and the valve needle spring 50a is at least partially accommodated in the accommodating structure 70a.

[0134] The valve structure provided in this embodiment has a accommodating structure 70a which is arranged on the side of the valve core 40a close to the nut sleeve 20a. The accommodating structure 70a corresponds to the valve needle spring 50a located between the valve core 40a and the nut sleeve 20a. The accommodating structure 70a can accommodate at least part of the valve needle spring 50a. The accommodating structure 70a reserves the installation space required for the valve needle spring 50a for the valve needle spring 50a. While ensuring that the original function of the valve core 40a is realized, the total length of the valve needle spring 50a after compression can be increased to the maximum extent, and the phenomenon of the valve needle spring 50a being compressed can be effectively avoided, so that after the valve structure is over-opened, the energized coil can still drive the valve core 40a to continue working through the screw 30a.

[0135] It should be noted that the valve needle spring 50a can be a cylindrical spring or a conical spring. This embodiment does not limit the specific structure of the valve needle spring 50a, and it can be adjusted according to actual production conditions.

[0136] In one embodiment, as shown in FIG. 27 , when the needle spring 50 a is in its natural state, the needle spring 50 a comprises multiple coils of the same wire diameter. The height of the needle spring 50 a along the axial direction of the valve core 40 a is greater than the sum of the wire diameters of the multiple coils. Specifically, the wire diameter of the coils is r.

[0137] In one embodiment, as shown in FIG29 , when the valve needle spring 50a is in a compressed state, the height of the valve needle spring 50a is still greater than the sum of the wire diameters of the multiple coils, and self-locking of the screw rod 30a caused by spring compression will not occur.

[0138] In one embodiment, the accommodating structure 70a is a first accommodating groove 71a provided on the valve core 40a and facing one end of the nut sleeve 20a.

[0139] Specifically, the first accommodating groove 71a is opened at the upper end of the valve core 40a and corresponds to the position of the valve needle spring 50a. The first accommodating groove 71a is used to accommodate at least part of the valve needle spring 50a, wherein the lower end portion of the valve needle spring 50a is accommodated in the first accommodating groove 71a, that is, the lower end portion of the valve needle spring 50a is sunken in the first accommodating groove 71a. The first accommodating groove 71a serves to increase the total length of the valve needle spring 50a after compression, thereby preventing the valve needle spring 50a from being compressed.

[0140] Furthermore, the first receiving groove 71a serves to limit the position of the needle spring 50a, preventing it from shifting during compression and ensuring the correct positioning of the needle spring 50a. Furthermore, the bottom of the needle spring 50a abuts the bottom of the first receiving groove 71a, providing excellent support for the needle spring 50a. The walls of the first receiving groove 71a also provide good guidance for the needle spring 50a during compression or extension.

[0141] In one embodiment, the first receiving groove 71 a is an annular structure.

[0142] Because the valve needle spring 50a can be a cylindrical spring or a conical spring, the projection of the valve needle spring 50a relative to the reference plane is an annular structure, where the reference plane is a plane perpendicular to the axial direction of the valve core 40a. The first receiving groove 71a is configured as an annular structure, and its contour matches the contour of the valve needle spring 50a to ensure that the first receiving groove 71a effectively accommodates the valve needle spring 50a.

[0143] In one embodiment, the first receiving groove 71a includes a guide portion 711a and a receiving portion 712a. The guide portion 711a is a trumpet-shaped structure. The large end of the guide portion 711a is arranged toward the nut sleeve 20a, and the small end of the guide portion 711a is connected to the receiving portion 712a.

[0144] Specifically, the large end of the guide portion 711a is positioned toward the nut sleeve 20a, while the small end of the guide portion 711a communicates with the accommodating portion 712a, thereby interconnecting the guide portion 711a and the accommodating portion 712a. The large end with a larger diameter serves to expand the capacity, allowing the valve needle spring 50a to pass through the large end of the guide portion 711a and enter the accommodating portion 712a, thereby effectively guiding the valve needle spring 50a. The small end with a smaller diameter engages with the accommodating portion 712a, and the tapered structure of the guide portion 711a guides the valve needle spring 50a into the accommodating portion 712a, thereby improving the accuracy of the installation position of the valve needle spring 50a.

[0145] In one embodiment, a positioning post is provided at one end of the valve core 40a facing the nut sleeve 20a, the first accommodating groove 71a is provided around the positioning post, and the positioning post is passed through the valve needle spring 50a.

[0146] Because the first receiving groove 71a is defined at the end of the valve core 40a facing the nut sleeve 20a, the portion of the valve core 40a facing the nut sleeve 20a that is not provided with the first receiving groove 71a comprises two parts: one located inside the valve needle spring 50a, forming a positioning portion, and the other located outside the valve needle spring 50a. The outer wall of the positioning post serves as the groove wall of the first receiving groove 71a. During initial installation, the positioning post penetrates the valve needle spring 50a, initially positioning the valve needle spring 50a and ensuring the installation accuracy of the valve needle spring 50a. During compression or extension, the valve needle spring 50a can slide relative to the positioning post, which acts as a guide to prevent the valve needle spring 50a from shifting out of position.

[0147] In one embodiment, a first through hole 21a is provided in the nut sleeve 20a along its axial direction, and the first through hole 21a includes a threaded section 211a and a guide section 212a. The threaded section 211a is arranged away from the valve port 12a, and the threaded section 211a is threadedly connected to the screw 30a. The valve housing 10a includes a valve cover 15a and a valve body 14a that are connected to each other. The nut sleeve 20a located in the valve cover 15a is connected to the valve body 14a, and a guide ring 60a is provided on the top of the valve body 14a. The guide ring 60a includes a radial section and an axial section, and at least part of the axial section is located in the nut sleeve 20a. The two ends of the valve needle spring 50a are respectively abutted against the radial section of the guide ring 60a and the valve core 40a.

[0148] The valve core 40a is inserted into a guide ring 60a, which guides the valve core 40a, thereby improving the coaxiality between the valve core 40a and the valve port 12a. Furthermore, the guide ring 60a is disposed at the top of the valve body 14a. The ends of the valve needle spring 50a abut against the radial section of the guide ring 60a and the valve core 40a, respectively. The guide ring 60a and valve core 40a limit the position of the valve needle spring 50a, which in turn acts as a buffer for resetting the valve.

[0149] In other embodiments, one end of the valve needle spring 50a away from the valve core 40a abuts against the nut sleeve 20a, and the nut sleeve 20a limits the valve needle spring 50a.

[0150] In one embodiment, as shown in Figures 26 and 28 , the valve core 40a includes a body 42a and a spring sleeve 41a. The body 42a includes a connecting end 421a and a blocking end 422a, which are oppositely disposed. The receiving structure 70a is disposed on the connecting end 421a, and the blocking end 422a blocks the valve port 12a. A positioning post is disposed on the connecting end 421a, which is connected to the spring sleeve 41a. The valve needle spring 50a is sleeved around the spring sleeve 41a and the positioning post. The spring sleeve 41a is guided by the axial section of the guide ring 60a.

[0151] That is, the valve needle spring 50a is disposed between the connecting end 421a of the body 42a and the guide ring 60a, and the guide ring 60a guides the spring sleeve 41a so that the screw 30a drives the spring sleeve 41a and the body 42a to move axially.

[0152] In one embodiment, the valve core 40a further includes a bearing 43a, which is disposed within a spring housing 41a. The inner ring of the bearing 43a is sleeved and fixedly connected to the screw 30a. The inner wall of the spring housing 41a forms a clearance fit with the outer ring of the bearing 43a, and the inner wall of the spring housing 41a serves to guide the outer ring of the bearing 43a. By disposing the bearing 43a within the spring housing 41a, the inner ring of the bearing 43a rotates with the screw 30a, while the outer ring of the bearing 43a, the spring housing 41a, and the valve body 42a do not rotate with the screw 30a. This reduces friction between the outer ring of the bearing 43a, the spring housing 41a, the valve body 42a, and other components, thereby extending the service life of the entire device. The inner wall of the spring sleeve 41a is used to guide the outer ring of the bearing 43a so that the bearing 43a and the screw 30a will not be skewed when the bearing 43a moves axially with the screw 30a, thereby improving the coaxiality of the screw 30a and the valve port 12a, and further improving the coaxiality of the valve core 40a and the valve port 12a.

[0153] In one embodiment, the valve core 40a also includes a connector 44a and a buffer spring 45a arranged in sequence along the axial direction. The buffer spring 45a is arranged near the valve port 12a. The connector 44a and the buffer spring 45a are both located in the spring sleeve 41a. The connector 44a includes a first section and a second section. The second section of the connector 44a is arranged near the valve port 12a. The diameter of the first section of the connector 44a is greater than the diameter of the second section of the connector 44a. The first section of the connector 44a abuts against the outer ring of the bearing 43a. One end of the buffer spring 45a is sleeved on the outside of the second section of the connector 44a and abuts against the end face of the first section of the connector 44a. The other end of the buffer spring 45a abuts against the body 42a.

[0154] The above-described structure ensures excellent structural stability between the connector 44a, buffer spring 45a, and the outer ring of the bearing 43a, thereby enhancing the overall structural stability of the valve core 40a. The connector 44a connects the buffer spring 45a to the outer ring of the bearing 43a. Optionally, a through-hole is provided within the connector 44a, which allows for clearance between the inner ring of the bearing 43a and the screw 30a. The buffer spring 45a buffers the thrust between the screw 30a and the body 42a, preventing the screw 30a from excessively squeezing the body 42a as it continues to move downward after the body 42a seals the valve port 12a.

[0155] Specifically, a connecting protrusion 4211a is provided on the end surface of the connecting end 421a. The connecting protrusion 4211a is inserted into the spring sleeve 41a and fixedly connected to the inner wall of the spring sleeve 41a. The connecting protrusion 4211a is inserted into the spring sleeve 41a and fixedly connected to the inner wall of the spring sleeve 41a. This firmly connects the main body 42a to the spring sleeve 41a, thereby improving the structural stability between the main body 42a and the spring sleeve 41a. The connecting protrusion 4211a and the spring sleeve 41a can be connected by welding.

[0156] Specifically, the valve housing 10a also includes a valve seat 13a, with the valve port 12a disposed on the valve seat 13a. A second through-hole is defined within the valve body 14a. The valve body 14a has a first end and a second end disposed opposite each other. The second end of the valve body 14a is fixedly connected to the valve seat 13a, and the second through-hole communicates with the valve port 12a. The body 42a is disposed within the second through-hole, with the outer wall of the body 42a guidingly engaging with the inner wall of the second through-hole. A accommodating space is defined within the valve cover 15a. The valve cover 15a has a first end and a second end disposed opposite each other. The second end of the valve cover 15a is fixedly connected to the first end of the valve body 14a. The accommodating space communicates with the second through-hole, and the two together form the accommodating chamber 11a.

[0157] The above structure facilitates the installation of the valve's internal components. The nut sleeve 20a is fixedly connected to the end face of the first end of the valve body 14a, facilitating its installation. The outer wall of the body 42a guides the inner wall of the second through hole, allowing the second through hole to guide the body 42a, further improving the coaxiality between the body 42a and the valve port 12a. The first end of the valve cover 15a is sealed, meaning the top of the accommodating portion 712a is sealed.

[0158] In this embodiment, the guide ring 60a is integrated with the valve body 14a. A communication hole is provided on the guide ring 60a, connecting the areas above and below the guide ring 60a within the accommodating chamber 11a. Specifically, an annular recess 423a is provided on the outer wall of the body 42a. An annular sealing ring 424a is located within this recess. This seals the inner wall of the second through hole and the outer wall of the body 42a. The placement of the annular sealing ring 424a within the recess 423a prevents the annular sealing ring 424a from separating from the body 42a.

[0159] In this embodiment, a limiting protrusion is further provided on the body 42a of the valve core 40a, and the gap between the limiting protrusion and the positioning column constitutes a first receiving groove 71a.

[0160] The valve needle spring 50a is located inside the limiting protrusion. The limiting protrusion is provided so that the valve needle spring 50a is located in the gap between the limiting protrusion and the positioning column, which can guide the valve needle spring 50a and prevent the valve needle spring 50a from twisting and deforming.

[0161] It should be noted that the valve structures shown in the drawings and described in this specification are only a few examples of the many valve structures that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are in no way limited to any details or any components of the valve structures shown in the drawings or described in this specification.

[0162] In summary, the valve structure proposed in the present disclosure includes a valve body 100, a valve core 200, and a sealing ring 300. The valve core 200 is provided with a sealing groove 210 in the circumferential direction. The sealing ring 300 is at least partially disposed in the sealing groove 210. A cavity is formed between the sealing groove 210 and the sealing ring 300. A balancing channel is provided in the valve core 200, one end of which is connected to the cavity and the other end is connected to the valve cavity 110. Through the above design, the present disclosure can use the balancing channel to divert fluid in the valve cavity 110 to the upper and / or lower portions of the sealing ring 300. As a result, the sealing ring 300 is squeezed in both directions along the circumferential direction in the area of ​​the sealing ring 300 near the valve port due to the diversion pressure, so that the outer area of ​​the sealing ring 300 resists the squeezing caused by the pressure difference, so that the force on the sealing ring 300 tends to be balanced, which helps to reduce or avoid deformation of the sealing ring 300 and improve the sealing performance of the valve structure.

[0163] While the present disclosure has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present disclosure can be embodied in many forms without departing from the spirit or substance of the disclosure, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A valve structure, comprising a valve body, a valve core and a sealing ring, wherein the valve body has a valve cavity, the valve cavity has a valve port, the valve core is movably arranged in the valve cavity and is used to adjustably seal the valve port, the valve core is provided with a sealing groove in the circumferential direction, the sealing ring is at least partially arranged in the sealing groove, and the portion of the sealing ring exposed in the sealing groove is sealed with the valve port; characterized in that: A cavity is formed between the sealing groove and the sealing ring, and a balancing channel is opened in the valve core, one end of the balancing channel is connected to the cavity, and the other end is connected to the space outside the valve core in the valve body; wherein the force exerted by the fluid on the part of the sealing ring exposed in the sealing groove is opposite to the direction of the force exerted by the fluid on the sealing ring in the cavity.

2. The valve structure according to claim 1, characterized in that: The sealing groove has an upper groove wall, the cavity includes a first cavity formed between the upper groove wall and the upper surface of the sealing ring, the balancing channel includes a first balancing channel, the first balancing channel is connected to the first cavity and the area of ​​the valve cavity located above the sealing ring; the sealing groove has a lower groove wall, the cavity includes a second cavity formed between the lower groove wall and the lower surface of the sealing ring, the balancing channel includes a second balancing channel, the second balancing channel is connected to the second cavity and the area of ​​the valve cavity located below the sealing ring.

3. The valve structure according to claim 2, characterized in that: In the radial direction of the valve body, the width of the upper groove wall is greater than that of the lower groove wall, and the width of the opening of the first balancing channel on the upper groove wall is greater than or equal to the width of the opening of the second balancing channel on the lower groove wall.

4. The valve structure according to claim 1, characterized in that: The sealing groove has an upper groove wall, the cavity includes a first cavity formed between the upper groove wall and the upper surface of the sealing ring, and the balancing channel includes a first balancing channel, which is connected to the first cavity and the area of ​​the valve cavity located above the sealing ring.

5. The valve structure according to claim 4, characterized in that: The valve core is provided with at least two first balancing channels, and the at least two first balancing channels are evenly spaced along the circumference of the valve core.

6. The valve structure according to claim 4, characterized in that: The first balancing channel is a through hole.

7. The valve structure according to claim 4, characterized in that: The first balancing channel is a through groove, and the plane where the upper groove wall is located is taken as a reference plane. On the reference plane, the orthographic projection of the through groove is an arc.

8. The valve structure according to claim 4, characterized in that: The upper surface of the sealing ring is provided with a first groove, and the first groove and the upper groove wall together form the first cavity.

9. The valve structure according to claim 8, characterized in that: A first groove is provided on the upper surface of the sealing ring. The first groove is in a closed circular ring shape. Each of the first balancing channels is arranged to overlap with the first groove.

10. The valve structure according to claim 1, characterized in that: The sealing groove has a lower groove wall, the cavity includes a second cavity formed between the lower groove wall and the lower surface of the sealing ring, and the balancing channel includes a second balancing channel, and the second balancing channel is connected to the second cavity and the area of ​​the valve cavity located below the sealing ring.

11. The valve structure according to claim 10, characterized in that: The lower groove wall is provided with at least two second balancing channels, and the at least two second balancing channels are evenly spaced and arranged along the circumference of the valve core.

12. The valve structure according to claim 10, characterized in that: The second balancing channel is a through hole.

13. The valve structure according to claim 10, characterized in that: The second balancing channel is a through groove, and the plane where the lower groove wall is located is taken as a reference plane. On the reference plane, the orthographic projection of the through groove is an arc.

14. The valve structure according to claim 10, characterized in that: A second groove is formed on the upper surface of the sealing ring, and the second groove and the lower groove wall together form the second cavity.

15. The valve structure according to claim 14, characterized in that: A second groove is formed on the lower surface of the sealing ring. The second groove is in a closed circular ring shape. Each of the second balancing channels is arranged to overlap with the second groove.

16. The valve structure according to claim 1, characterized in that: The valve core includes a piston and a compression sleeve, the compression sleeve is connected to the lower end of the piston, the piston is circumferentially provided with a first boss, the compression sleeve is circumferentially provided with a second boss, the first boss and the second boss are axially spaced apart; wherein the space between the first boss and the second boss forms the sealing groove, the lower surface of the first boss is the upper groove wall of the sealing groove, and the upper surface of the second boss is the lower groove wall of the sealing groove.

17. The valve structure according to claim 1, characterized in that: The sealing groove has an upper groove wall and a lower groove wall spaced apart from each other, and at least one of the upper groove wall and the lower groove wall is provided with a first positioning structure, which is at least one of a protrusion and a groove; wherein the valve structure is configured to position the sealing ring using the first positioning structure.

18. The valve structure according to claim 17, characterized in that: The first positioning structure includes a plurality of positioning portions, and the plurality of positioning portions belonging to the same first positioning structure are arranged at intervals along an annular path.

19. The valve structure according to claim 17, characterized in that: The upper groove wall is provided with at least two of the first positioning structures, and the at least two of the first positioning structures are radially spaced apart from each other on the upper groove wall.

20. The valve structure according to claim 17, characterized in that The lower groove wall is provided with at least two of the first positioning structures, and the at least two of the first positioning structures are radially spaced apart from each other on the lower groove wall.

21. The valve structure according to any one of claims 17 to 20, characterized in that: The valve core comprises a piston and a compression sleeve, wherein the compression sleeve is sleeved on one end of the piston along the axial direction, and the piston and the compression sleeve together form the sealing groove.

22. The valve structure according to claim 21, characterized in that The piston forms the upper groove wall, the pressing sleeve forms the lower groove wall and the groove bottom of the sealing groove, and a step structure is provided on the inner circumference of the piston toward one end of the pressing sleeve. The step structure and the pressing sleeve together form a groove, and the groove is the first positioning structure.

23. The valve structure according to claim 21, characterized in that The piston forms the upper groove wall and the groove bottom of the sealing groove, the pressing sleeve forms the lower groove wall, and the piston is provided with a groove at a position where the upper groove wall is adjacent to the groove bottom, and the groove is the first positioning structure.

24. The valve structure according to any one of claims 17 to 20, characterized in that: The sealing ring has a first surface abutting against the upper groove wall and a second surface abutting against the lower groove wall, at least one of the first surface and the second surface is provided with a second positioning structure, the second positioning structure is at least one of a groove and a protrusion, and the second positioning structure is arranged corresponding to the position of the first positioning structure and limitedly cooperates with it.

25. The valve structure according to claim 1, characterized in that The valve structure also includes: a valve housing having a accommodating cavity and a valve port; a nut sleeve, the nut sleeve being arranged in the accommodating cavity and the nut sleeve being fixedly connected to the valve housing; a screw rod, the screw rod being passed through the nut sleeve and connected to the nut sleeve, the screw rod driving the valve core to block or open the valve port; a valve needle spring, the valve needle spring being arranged between the valve core and the nut sleeve; wherein the valve needle spring is a tower-shaped structure.

26. The valve structure according to claim 25, characterized in that The valve needle spring comprises a plurality of coils that are interconnected and coaxially arranged, and the wire diameters of the plurality of coils are the same; the height of the valve needle spring when compressed to the limit is equal to the wire diameter of one of the coils.

27. The valve structure according to claim 25, characterized in that The valve housing includes a valve body and a valve cover that are interconnected, the nut sleeve is located in the valve cover and is connected to the valve body; the valve core includes a main body, and the first end of the valve needle spring abuts against the main body; a guide ring is provided on the top of the valve body; the guide ring has a radial section, and the radial section is located between the nut sleeve and the valve core, and the second end of the valve needle spring abuts against the radial section.

28. The valve structure according to claim 27, characterized in that The radial section is provided with a first sub-through hole, and the first sub-through hole communicates the inner cavity of the valve housing with the inner cavity of the valve body.

29. The valve structure according to claim 27, characterized in that A connecting protrusion is provided at one end of the body facing the nut sleeve, and the first end of the valve needle spring is sleeved outside the connecting protrusion and abuts against the body.

30. The valve structure according to claim 29, characterized in that The valve core includes a spring sleeve connected to the connecting protrusion, and the guide ring also includes an axial section. The spring sleeve is guided and matched with the axial section of the guide ring, and the valve needle spring sleeve is arranged outside the spring sleeve.

31. The valve structure according to any one of claims 27 to 30, characterized in that: The diameter of the second end of the valve needle spring is greater than the diameter of the first end.

32. The valve structure according to claim 27, characterized in that The outer wall of the main body is provided with an annular sealing ring, and the main body is in sealing cooperation with the valve body through the annular sealing ring.

33. The valve structure according to claim 30, characterized in that The body has a passage communicating with the valve port, and the passage is also communicating with the inner cavity of the valve body where the valve needle spring is located.

34. The valve structure according to claim 33, characterized in that The spring sleeve is provided with a second sub-through hole, and the passage of the body is communicated with the inner cavity of the valve body where the valve needle spring is located through the second sub-through hole.

35. The valve structure according to claim 1, characterized in that The valve structure also includes: a valve housing, which is provided with a accommodating cavity and a valve port; a nut sleeve, which is arranged in the accommodating cavity; a screw rod, which is passed through the nut sleeve and threadedly connected with the nut sleeve, the valve core is connected to the screw rod and is arranged corresponding to the valve port, and the screw rod drives the valve core to block or open the valve port; an accommodating structure, which is arranged on a side of the valve core close to the nut sleeve; a valve needle spring, which is arranged between the valve core and the nut sleeve and is at least partially accommodated in the accommodating structure.

36. The valve structure according to claim 35, characterized in that The accommodation structure is a first accommodation groove which is arranged on the valve core and faces one end of the nut sleeve.

37. The valve structure according to claim 36, characterized in that The first accommodating groove includes a guiding portion and an accommodating portion, the guiding portion is a trumpet-shaped structure, the large end of the guiding portion is arranged toward the nut sleeve, and the small end of the guiding portion is connected to the accommodating portion.

38. The valve structure according to claim 36, characterized in that A positioning column is arranged at one end of the valve core facing the nut sleeve, the first accommodating groove is arranged around the positioning column, and the positioning column is penetrated by the valve needle spring.

39. The valve structure according to claim 35, characterized in that The valve housing includes a valve cover and a valve body connected to each other, the nut sleeve located in the valve cover is connected to the valve body, a guide ring is provided on the top of the valve body, and the guide ring includes a radial section; wherein the two ends of the valve needle spring are respectively abutted against the radial section of the guide ring and the valve core.

40. The valve structure according to claim 35, characterized in that One end of the valve needle spring away from the valve core abuts against the nut sleeve.

41. The valve structure according to claim 39, characterized in that The guide ring also includes an axial section, at least a portion of which is located within the nut sleeve.

42. The valve structure according to claim 41, characterized in that The valve core includes a body and a spring sleeve, the body includes a connecting end and a blocking end that are relatively arranged, the accommodating structure is arranged at the connecting end, and the blocking end blocks the valve port; the connecting end is provided with a positioning column, the positioning column is connected to the spring sleeve, and the valve needle spring sleeve is arranged outside the spring sleeve and the positioning column; the spring sleeve is guided and matched with the axial section of the guide ring.

43. The valve structure according to claim 42, characterized in that The valve core is further provided with a limiting protrusion, and the gap between the limiting protrusion and the positioning column constitutes a first accommodating groove.

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