Valve body

Abstract

A valve body includes: a valve main body having a flow passage therein; the valve element is partially located in the flow channel; the driving piece is connected with the valve element; the valve body is characterized in that the valve body further comprises a sealing piece annularly arranged on the outer side of the valve element, and the driving piece can drive the valve element to axially move relative to the valve body and the sealing piece so as to change the size of the flow channel; the abutting part is located on the lower side of the sealing piece and supports the bottom end of the sealing piece; a crimping portion located on an upper side of the seal, the seal being crimped between the crimping portion and the abutting portion; the pressing part or the abutting part is provided with an inclined face, the inclined face abuts against the sealing piece and inclines to the outer side wall of the valve element, and the sealing piece is partially pressed between the inclined face and the outer side wall of the valve element. The inclined plane can ensure that the axial crimping acting force borne by the sealing element has a component force perpendicular to the direction of the outer side wall of the valve element, so that the crimping acting force between the sealing element and the valve element is larger, and good sealing reliability between the sealing element and the valve element is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a valve body. Background Art

[0002] Valves are often used in fluid systems to control the on / off, direction, pressure or flow of fluids. The aforementioned functions are often achieved through the movement of the valve core. While satisfying the movement of the valve core, it is necessary to ensure good sealing performance between the valve core and the valve body to avoid fluid leakage.

[0003] The traditional way is to ensure sealing through sealing rings. Although sealing rings can achieve good sealing effects, they are prone to wear and produce particles when used as dynamic seals, which can cause fluid contamination. Therefore, the sealing method using sealing rings is not suitable for environments with high cleanliness requirements.

[0004] For example, a needle valve structure disclosed in patent CN202228692U realizes the sealing between the valve core and the valve body through the sealing packing, and the sealing packing is compressed by the force transmission sleeve. The compression force can only make the sealing packing deform radially so as to increase the radial contact force between the sealing packing and the valve core, thereby improving the sealing effect between the sealing packing and the valve core. However, under this structure, when the compression force on the sealing packing is small, the radial deformation of the sealing packing is small, and the sealing packing and the valve core are prone to leakage. If the compression force is too large, if the sealing packing is made of resin or other materials, the sealing packing itself is prone to plastic deformation due to the excessive compression force, resulting in the sealing packing failing to perform a normal sealing effect. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a valve body.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows:.

[0007] A valve body, comprising:

[0008] A valve body having a flow channel disposed therein;

[0009] The valve core is partially located inside the flow channel;

[0010] A driving member connected to the valve core;

[0011] The valve body also includes:

[0012] The sealing member is arranged on the outside of the valve core, and the driving member can drive the valve core to move axially relative to the valve body and the sealing member to change the size of the flow channel;

[0013] The abutment portion is located at the lower side of the seal and supports the bottom end of the seal;

[0014] The crimping portion is located on the upper side of the sealing member, and the sealing member is crimped between the crimping portion and the abutting portion;

[0015] The crimping portion or the abutting portion has an inclined surface, the inclined surface abuts against the sealing member and is inclined to the outer side wall of the valve core, and the sealing member is partially crimped between the inclined surface and the outer side wall of the valve core.

[0016] With such arrangement, the seal will be subjected to the axial crimping action of the crimping portion and the abutting portion, and the arrangement of the inclined surface inclined to the outer wall of the valve core can ensure that the axial crimping force exerted on the seal will have a component force perpendicular to the direction of the outer wall of the valve core, and the seal part is located between the inclined surface and the outer wall of the valve core, which can ensure that the component force perpendicular to the direction of the outer wall of the valve core can make the crimping force between the seal and the valve core larger, so that under the action of the inclined surface, the seal and the valve core can be closely fitted, thereby ensuring a good sealing effect between the seal and the valve core. In the above structure, since the axial pressing force of the seal can be used to achieve a tight fit between the seal and the valve core, the elastic performance of the seal itself is not required to be high. Therefore, the seal can be made of a material with stable performance and a relatively smooth surface, such as PFA, PTFE and other fluororesin materials, so that the resistance to relative movement between the seal and the valve core will not be too large when they are in contact with each other, and it is not easy to wear and produce particulate matter due to relative movement. Compared with the traditional rubber sealing ring sealing structure, it can greatly improve the cleanliness of the valve body and will not cause serious pollution to the fluid.

[0017] At the same time, in the aforementioned structure, the axial pressing force on the seal will directly increase the abutment force between the seal and the valve core, ensuring the sealing effect between the two, that is, the structure has a lower requirement for the axial pressure, that is, it is easier to keep the seal between the seal and the valve core. In addition, the inclined surface can be set on the abutment portion, that is, on the lower side of the seal; it can also be set on the pressing portion, that is, on the upper side of the seal.

[0018] Preferably, the portion of the seal member that abuts against the inclined surface is a pressure-bearing surface, and both the inclined surface and the pressure-bearing surface are conical surface structures inclined to the outer side wall of the valve core.

[0019] Such a configuration, by configuring both the pressure surface and the inclined surface to be conical structures, makes structural processing more convenient, and after the pressure surface and the inclined surface are matched, the two can fit more fully, avoiding the presence of a gap between the two that causes liquid to accumulate in the gap, or avoiding the lack of sufficient fit between the two that results in a poor sealing effect between the seal and the abutment portion.

[0020] Preferably, during installation, the seal is interference-fitted between the inclined surface and the outer side wall of the valve core, and the inclined surface is fitted with the pressure surface; during disassembly, the angle between the pressure surface and the vertical surface is smaller than the angle between the inclined surface and the vertical surface.

[0021] With such a configuration, during installation, the seal between the inclined surface and the valve core has the largest interference at the end far from the center of the seal, and the abutment force between the seal and the valve core is the largest at this location, thereby ensuring the best sealing effect at the end. In other words, this design can ensure that the interference stress of the seal is not evenly distributed, and ensure that there is a sufficiently large force locally between the seal and the valve core, so that when the axial force on the seal is small, it can also ensure good sealing reliability.

[0022] Preferably, the seal comprises a main body having a pressure-bearing surface and a lateral extension portion, wherein the lateral extension portion is integrally formed on the side wall of the main body, the inclined surface is arranged on the abutment portion, and the abutment portion has a supporting wall abutting against the bottom of the lateral extension portion to limit the downward movement of the seal.

[0023] With such a configuration, when the axial pressure on the seal is too large, most of the pressure will be dispersed in the lateral extension part, thereby avoiding excessive pressure on the main body, thereby avoiding excessive pressure causing plastic deformation of the main body, resulting in a poor sealing effect between the main body and the valve core and the abutment part; or avoiding excessive pressure between the main body and the valve core, resulting in difficulty in relative movement between the main body and the valve core, or even if they can move, particles are easily generated between the two due to wear. At the same time, the abutment between the lateral extension part and the abutment part can achieve a further sealing effect there, thereby further avoiding leakage between the seal and the abutment part.

[0024] Preferably, the main body is provided with a first protrusion whose highest point axial height is higher than the top wall of the transverse extension portion; and / or the crimping portion is provided with a second protrusion abutting against the top end of the main body, and the lowest end of the second protrusion is lower than the lowest end of the crimping portion.

[0025] With such a configuration, when the axial pressure on the seal is not large, the pressure will be concentrated on the main body, avoiding the pressure from being dispersed to the transverse extension part, so that a large abutment force can be achieved between the main body and the valve core and the abutment part, so as to ensure good sealing performance between the main body and the valve core and the abutment part. When the pressure is too large, the first protrusion or the second protrusion will be deformed, so that the crimping part is in contact with the main body and the transverse extension part at the same time, so as to disperse the excessive crimping force to the transverse extension part through the transverse extension part.

[0026] Preferably, an inner inclined wall and an outer inclined wall are respectively provided on the inner side of the first protrusion and the outer side of the first protrusion, and the absolute value of the slope of the inner inclined wall is greater than the absolute value of the slope of the outer inclined wall.

[0027] Such an arrangement can achieve that when the first protrusion is pressurized, the first protrusion will tend to deform inwards more, so that the crimping force will make the main body and the valve core fit more closely, thereby ensuring a good sealing effect between the valve core and the main body and avoiding fluid leakage.

[0028] Preferably, the inner wall of the sealing member is a conical structure, the diameter of one end of the conical surface close to the inclined surface is smaller than the diameter of the other end, and the minimum diameter of the conical surface is smaller than or equal to the outer diameter of the valve core.

[0029] Such an arrangement can ensure that there is no gap between the conical surface and the valve core, and even when the axial pressure on the seal is small, it can ensure that there is no leakage between the seal and the valve core. At the same time, the diameter of the conical surface close to the inclined surface is smaller, which can ensure that the seal has a larger interference fit at the inclined surface, so as to ensure that the inner side of the seal and the valve core, and the outer side and the abutment can fit well, thereby ensuring the sealing effect between the two.

[0030] Preferably, the maximum diameter of the inner wall of the sealing element is less than or equal to the outer diameter of the valve core.

[0031] Such a configuration can ensure that the entire inner wall of the seal is interference fit with the valve core, thereby further improving the sealing effect between the seal and the valve core, especially when the axial pressure on the seal is small, the seal can also ensure a good sealing effect with the valve core.

[0032] Preferably, the abutting portion is provided with a parallel wall parallel to the side wall of the valve core, and the sealing member has a second sealing portion which is interference-inserted between the parallel wall and the valve core.

[0033] With such arrangement, a further sealing effect is achieved through the second sealing portion. When the sealing of the seal and the abutment portion or the valve core fails in the height area where the inclined surface is located, the second sealing portion can still ensure the sealing between the abutment portion or the valve core, thereby avoiding leakage.

[0034] Preferably, the inclination angle of the inclined surface relative to the horizontal plane is greater than or equal to 45°.

[0035] By setting it in this way, through the setting of this angle, it can be ensured that when the seal is subjected to pressure from the abutment part and the crimping part, there can be a component force that is large enough and perpendicular to the outer wall of the valve core, thereby ensuring that there is a sufficiently large abutment force between the seal and the valve core to ensure a good sealing effect between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present utility model, rather than limiting the present utility model.

[0037] Figure 1 This is a schematic cross-sectional view of the structure of the first embodiment of the present invention;

[0038] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0039] Figure 3 This is a schematic cross-sectional structural diagram of a sealing member in Embodiment 1 of the present utility model;

[0040] Figure 4 It is a partial cross-sectional structural schematic diagram of the first embodiment of the utility model without the sealing member;

[0041] Figure 5 It is a schematic cross-sectional view of the local structure of the second embodiment of the utility model;

[0042] Figure 6 It is a schematic cross-sectional view of the local structure of the third embodiment of the present utility model.

[0043] Figure numerals: 1. valve body; 11. flow channel; 12. manifold member; 13. cover body; 2. valve core; 3. driving member; 4. sealing member; 41. pressure surface; 42. main body; 43. lateral extension portion; 44. first protrusion; 45. inner inclined wall; 46. outer inclined wall; 47. second sealing portion; 5. abutment portion; 6. crimping portion; 7. inclined surface. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. The components of the embodiments of the utility model described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] Unless otherwise defined, the technical terms or scientific terms used in this patent document shall be the common meanings understood by people with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the utility model patent specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantity limit, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0047] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0048] Embodiment 1

[0049] A valve body, referring to Figure 1 as well as Figure 2 , including a valve body 1, a valve core 2 and a driving member 3. A flow channel 11 is arranged inside the valve body 1, and the valve core 2 is partially located inside the flow channel 11. The driving member 3 is connected to the valve core 2 and can drive the valve core 2 to move axially to change the size of the flow channel 11.

[0050] The valve body also includes a sealing member 4, an abutting portion 5 and a crimping portion 6. The sealing member 4 is arranged around the outside of the valve core 2, and the valve core 2 can move relative to the sealing member 4. The abutting portion 5 is located at the lower side of the sealing member 4 and supports the bottom end of the sealing member 4. The crimping portion 6 is located at the upper side of the sealing member 4, and the sealing member 4 is crimped between the crimping portion 6 and the abutting portion 5.

[0051] In the above structure, the valve body 1 includes a manifold component 12 and a cover body 13 threadedly connected to the manifold component 12, and the crimping portion 6 is crimped between the manifold component 12 and the cover body 13. The cover body 13 presses the crimping portion 6 to achieve the crimping portion 6 pressurizing the seal 4, and the seal 4 is crimped between the crimping portion 6 and the abutment portion 5, and the driving member 3 is a rod-shaped structure, and the rod-shaped structure is threadedly connected to the abutment portion 6 to achieve the axial movement of the driving member 3 when rotating, and drive the valve core 2 to move axially. Of course, in other embodiments, the driving member 3 can also be a threaded structure with the cover body 13; or the valve body 1 is provided with a through hole, and the abutment portion 5 is directly threadedly connected to the through hole, so as to achieve pressurization of the seal 4, and the driving member 3 is further threadedly connected to the abutment portion 5 or the inner wall of the through hole.

[0052] In this embodiment, the outer wall of the valve core 2 is a straight cylindrical structure to ensure that when the valve core 2 moves axially relative to the seal 4, no leakage occurs between the seal 4 and the valve core 2 due to changes in the outer size of the valve core 2.

[0053] Reference Figure 4 , an inclined surface 7 is provided on the abutting portion 5, and the abutting portion 5 is integrally formed with the valve body 1, the inclined surface 7 abuts against the sealing member 4, and is inclined to the outer wall of the valve core 2, so that the abutting force between the inclined surface 7 and the sealing member 4 has a component force perpendicular to the outer wall of the valve core 2; refer to Figure 2 , and part of the seal 4 is pressed between the inclined surface 7 and the outer wall of the valve core 2, that is, the aforementioned component force inclined to the outer wall of the valve core 2 can press the seal 4 against the outer wall of the valve core 2, thereby increasing the abutment force between the seal 4 and the valve core 2 to ensure a better sealing effect between the seal 4 and the valve core 2 and avoid leakage between the seal 4 and the valve core 2.

[0054] Since the valve core 2 and the seal 4 are relatively movable, the valve core 2 and the seal 4 are preferably made of a material with a small friction coefficient, and the inner wall of the seal 4 and the outer wall of the valve core 2 are both set to a smooth structure. For example, both can be made of PTFE, PFA and other fluororesin materials with a small friction coefficient and corrosion resistance.

[0055] Reference Figure 4 , and the inclined surface 7 can be selected as a conical structure, and the part of the seal 4 that abuts against the inclined surface 7 is the pressure surface 41, and the pressure surface 41 can also be set as a conical structure. This setting can achieve better fit between the inclined surface 7 and the pressure surface 41, so as to ensure that there is no gap between the inclined surface 7 and the pressure surface 41, thereby ensuring a good sealing effect between the inclined surface 7 and the pressure surface 41. At the same time, the conical structure is more convenient to process than other structures.

[0056] Further, when disassembling, refer to Figure 3 as well as Figure 4 , that is, when the seal 4 is removed from the valve body 1 and does not abut against the abutment portion 5 and the crimping portion 6, the angle between the pressure surface 41 and the vertical surface is smaller than the angle between the inclined surface 7 and the vertical surface, and when installing, the seal 4 is axially compressed between the abutment portion 5 and the crimping portion 6, and the seal 4 is interference-set between the inclined surface 7 and the outer wall of the valve core 2, and the inclined surface 7 is fitted with the pressure surface 41. Thus, during installation, the end of the seal 4 away from the center of the seal 4 has a larger interference, and the sealing effect of the end is the best at this time. If it is necessary to ensure that the seal 4 has a sufficiently large interference in the entire height area of ​​the inclined surface 7 during installation, and the interference is the same everywhere, it will cause the seal 4 to be difficult to install, and it is difficult to assemble the seal 4 between the valve core 2 and the abutment portion 5, and it is difficult to ensure that the seal 4 can be fully fitted with the valve core 2 and the abutment portion 5 without generating gaps. At the same time, the setting of the same interference fit at various locations of the seal 4 will cause the pressure between the seal 4 and the valve core 2 to be dispersed, which in turn leads to unreliable sealing performance.

[0057] like Figure 4 The inclination angle between the inclined surface 7 and the horizontal plane is α, α≥45°. Through this setting, it can be ensured that the component of the supporting force of the inclined surface 7 for the seal 4 in the horizontal direction is large enough, thereby ensuring that the abutting force between the seal 4 and the valve core 2 is large enough, thereby ensuring that the seal 4 and the valve core 2 have good sealing reliability.

[0058] Further, refer to Figure 3 , Figure 3 The dotted line is a vertical line, and the inner side of the seal 4 is a conical structure. Figure 2 as well as Figure 3 , the diameter of the conical surface at one end close to the pressure surface 41 is smaller than the diameter of the other end, and the minimum diameter of the conical surface is less than or equal to the outer diameter of the valve core 2. This structure can ensure that when there is no external force between the seal 4 and the valve core 2, the seal 4 can also be tightly mounted on the valve core 2, so that when the external force is small, it is not easy to leak between the seal 4 and the valve core 2. In addition, the end with a smaller diameter of the conical surface is set at the end close to the pressure surface 41, so that when the seal 4 is set between the inclined surface 7 and the valve core 2 with an interference fit, there will be a large deformation stress on the inside of the seal 4, thereby ensuring a good sealing effect between the seal 4 and the valve core 2, and avoiding the situation where the deformation stress of the seal 4 is concentrated on the abutting part with the inclined surface 7, resulting in a poor sealing effect between the seal 4 and the valve core 2.

[0059] Further preferably, the maximum diameter of the inner wall of the seal 4 is less than or equal to the outer diameter of the valve core 2, so that almost the entire inner wall of the seal 4 will have an interference fit with the seal 4, thereby achieving a good sealing effect between the seal 4 and the valve core 2 when the abutment force between the seal 4 and the valve core 2 is small.

[0060] like Figure 2 as well as Figure 3 As shown, the seal 4 includes a main body 42 with a pressure surface 41 and a transverse extension portion 43, the transverse extension portion 43 is integrally formed with the side wall of the main body 42, and the abutment portion 5 has a supporting wall abutting against the bottom of the transverse extension portion 43 to limit the downward movement of the seal 4.

[0061] This structure can ensure that when the sealing member 4 is subjected to a too large crimping force by the crimping portion 6, the crimping force will be concentrated in the lateral extension portion 43, thereby preventing excessive pressure from being concentrated in the main body 42, resulting in plastic deformation of the main body 42 due to excessive force, and failure to seal between the main body 42 and the valve core 2 or the abutment portion 5; while preventing the main body 42 from being subjected to excessive force, it can also prevent the abutment force between the main body 42 and the valve core 2 from being too large, resulting in difficulty for the valve core 2 to move relative to the main body 42, or the valve core 2 moving relative to the main body 42 is prone to friction and the like.

[0062] In addition, under normal conditions, the abutment between the lateral extension portion 43 and the abutment portion 5 can further play a sealing role, that is, it can further ensure that there is a good sealing effect between the sealing member 4 and the abutment portion 5 .

[0063] Reference Figure 3 , a first protrusion 44 may be further provided at the top of the main body 42, and the highest point of the first protrusion 44 has an axial height higher than the top wall of the transverse extension portion 43. The first protrusion 44 structure enables the crimping portion 6 to first contact the first protrusion 44 when applying pressure to the seal 4, so that the pressure is initially concentrated on the main body 42, so as to ensure that the main body 42 has a sufficiently large abutment force with the abutment portion 5 and the valve core 2, so as to ensure good sealing performance between the two. When the pressure of the crimping portion 6 on the seal 4 increases, the first protrusion 44 will gradually deform, and when the pressure is too large, the deformation of the first protrusion 44 is too large, so the crimping portion 6 will contact the transverse extension portion 43, so that the excessive pressure will be dispersed in the transverse extension portion 43, avoiding the excessive pressure from being concentrated on the main body 42. Of course, when the aforementioned pressure is too large, the contact portion between the crimping portion 6 and the first protrusion 44 may be deformed, or both the crimping portion 6 and the first protrusion 44 may be deformed, and finally the crimping portion 6 may be in contact with the lateral extension portion 43 .

[0064] In other embodiments, a second protrusion may be provided at the bottom of the crimping portion 6, and the second protrusion may abut against the top of the main body 42, and the lowest end of the second protrusion is lower than the lowest end of the crimping portion 6, so that the crimping portion 6 will initially pressurize the main body 42 through the second protrusion, and will not directly contact and pressurize the lateral extension portion 43. In other embodiments, a second protrusion may be provided at the bottom of the crimping portion 6 while a first protrusion 44 is provided at the top of the main body 42.

[0065] Reference Figure 3 An inner inclined wall 45 and an outer inclined wall 46 are further provided on the inner and outer sides of the first protrusion 44, respectively, wherein the absolute value of the slope of the inner inclined wall 45 is greater than the absolute value of the slope of the outer inclined wall 46, so that when the first protrusion 44 is under pressure, the first protrusion 44 will drive the main body 42 to deform toward the inner side of the seal 4, thereby increasing the axial abutment force between the end of the seal 4 close to the first protrusion 44 and the valve core 2, that is, it can improve the sealing effect between this end of the seal 4 and the valve core 2.

[0066] Reference Figure 2 The abutment 5 is provided with a parallel wall parallel to the side wall of the valve core 2, and the main body 42 in the sealing member 4 has a second sealing member 47 inserted between the parallel wall and the valve core 2. The second sealing member 47 is used to achieve a further sealing effect to ensure that at the inclined surface 7, in the event of leakage between the sealing member 4 and the abutment 5 and the valve core 2, the second sealing member 47 can also ensure the sealing effect between the sealing member and the valve core 2 and the abutment 5.

[0067] Embodiment 2

[0068] The difference from the first embodiment is that:

[0069] like Figure 5 As shown, the abutment portion 5 and the valve body 1 are not integrally formed, the bottom end of the abutment portion 5 is arranged to abut against the valve body 1, and the sealing between the abutment portion 5 and the valve body 1 is achieved by the abutment between the abutment portion 5 and the valve body 1; at the same time, a sealing ring or a sealing gasket or other structure can be further arranged between the abutment portion 5 and the valve body 1 to improve the sealing effect between the abutment portion 5 and the valve body 1.

[0070] Further preferably, the outer wall of the abutment portion 5 is arranged to abut against the valve body 1, so that the outer wall of the abutment portion 5 is supported by the valve body 1, thereby preventing the abutment portion 5 from being radially deformed due to the abutment force when the seal 4 abuts against the inclined wall, and affecting the sealing effect between the seal 4 and the abutment portion 5 and the valve core 2.

[0071] Embodiment 3

[0072] The difference from the first or second embodiment is that:

[0073] like Figure 6 As shown, an inclined surface 7 is provided on the crimping portion 6, and the seal 4 is partially interference-arranged between the inclined surface 7 and the valve core 2, and the first protrusion 44 is provided at the bottom end of the transverse extension portion 43, and the lowest point of the first protrusion 44 is lower than the bottom wall of the transverse extension portion 43, so as to ensure that the first protrusion 44 contacts the abutting portion 5 first. When the axial pressure on the seal 4 is too large, at least one of the first protrusion 44 and the abutting portion 5 is deformed until the abutting portion 5 contacts the transverse extension portion 43, and the axial pressure on the seal 4 is dispersed through the transverse extension portion 43.

[0074] The crimping portion 6 is provided with a parallel wall parallel to the side wall of the valve core 2, and the main body 42 has a second sealing portion 47 inserted between the parallel wall and the valve core 2. The second sealing portion 47 has a further sealing effect to ensure that no fluid leakage occurs between the seal 4 and the valve core 2 and the crimping portion 6.

[0075] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A valve body, comprising: A valve body having a flow channel disposed therein; The valve core is partially located inside the flow channel; A driving member connected to the valve core; Characterized in that the valve body also includes: The sealing member is arranged on the outside of the valve core, and the driving member can drive the valve core to move axially relative to the valve body and the sealing member to change the size of the flow channel; The abutment portion is located at the lower side of the seal and supports the bottom end of the seal; The crimping portion is located on the upper side of the sealing member, and the sealing member is crimped between the crimping portion and the abutting portion; The crimping portion or the abutting portion has an inclined surface, the inclined surface abuts against the sealing member and is inclined to the outer side wall of the valve core, and the sealing member is partially crimped between the inclined surface and the outer side wall of the valve core.

2. The valve body according to claim 1, characterized in that: The portion of the sealing member that abuts against the inclined surface is a pressure-bearing surface, and both the inclined surface and the pressure-bearing surface are conical surface structures inclined to the outer side wall of the valve core.

3. The valve body according to claim 2, characterized in that: During installation, the seal is interference-set between the inclined surface and the outer side wall of the valve core, and the inclined surface is fitted with the pressure surface; during disassembly, the angle between the pressure surface and the vertical surface is smaller than the angle between the inclined surface and the vertical surface.

4. The valve body according to claim 2, characterized in that: The seal comprises a main body with a pressure surface and a transverse extension portion, wherein the transverse extension portion is integrally formed on the side wall of the main body, the inclined surface is arranged on the abutment portion, and the abutment portion has a supporting wall abutting against the bottom of the transverse extension portion to limit the downward movement of the seal.

5. The valve body according to claim 4, characterized in that: The main body is provided with a first protrusion whose highest point axial height is higher than the top wall of the transverse extension portion; and / or the crimping portion is provided with a second protrusion abutting against the top end of the main body, and the lowest end of the second protrusion is lower than the lowest end of the crimping portion.

6. The valve body according to claim 5, characterized in that An inner inclined wall and an outer inclined wall are respectively disposed on the inner side of the first protrusion and the outer side of the first protrusion, and the absolute value of the slope of the inner inclined wall is greater than the absolute value of the slope of the outer inclined wall.

7. The valve body according to claim 1, characterized in that The inner wall of the sealing element is a conical structure, the diameter of one end of the conical surface close to the inclined surface is smaller than the diameter of the other end, and the minimum diameter of the conical surface is smaller than or equal to the outer diameter of the valve core.

8. The valve body according to claim 7, characterized in that The maximum diameter of the inner wall of the sealing member is less than or equal to the outer diameter of the valve core.

9. The valve body according to claim 1, characterized in that: The abutting portion is provided with a parallel wall parallel to the side wall of the valve core, and the sealing member has a second sealing portion which is interference-inserted between the parallel wall and the valve core.

10. The valve body according to claim 1, characterized in that The inclination angle of the inclined surface relative to the horizontal plane is greater than or equal to 45°.

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