Valve core connection structure and valve core assembly

Abstract

Disclosed are a valve core connection structure and a valve core assembly. The valve core connection structure is used to connect a valve rod and a valve head. A side of the valve core connection structure close to the valve rod presses a valve rod annular step of the valve rod along an axial direction, and a side of the valve core connection structure close to the valve head presses a specially-shaped concave-convex connection structure of the valve head along a lateral direction. The valve core connection structure provided by the present application is used in scenarios such as a medium containing solids, a flow-rate being high, high scrubbing conditions being present, and the valve rod being made of metal and the valve core being a fragile material. By means of the design of the structure, reliable connection between a metal material and a superhard material can be ensured, and the capability of the superhard material to withstand impact can be improved to a certain extent, thereby achieving an overall long service life of the valve core assembly.

Description

A valve core connection structure and valve core assembly

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 7, 2023, with application number 202311676489.X and invention name “A valve core connection structure and valve core assembly”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of industrial valves, and in particular to a valve core connection structure and a valve core assembly. Background Art

[0003] In the chemical industry, some key process control valves are in conditions with high solid content or even gas-liquid-solid three-phase flow. Especially under high pressure differential conditions, high flow rates will cause the valves to withstand strong impacts and rapid corrosion, and the life of conventional valve cores is far less than expected. For this reason, the industry will use superhard materials instead of metal materials as wear-resistant parts for the valve core head, while other parts such as the valve stem are still made of metal materials. However, superhard materials are generally hard and brittle, and superhard materials and metal materials are dissimilar materials, making it difficult to reliably connect them by welding. Unreasonable connection structures often cause the superhard valve head to fall off, which in turn causes equipment damage and device shutdown, resulting in significant economic losses for industrial users. In addition, vibration, impact, and other conditions are very likely to occur in multiphase flow conditions. How to ensure that the superhard material is not impacted and broken on the basis of reliable connection is also a need for improvement.

[0004] Summary of the Invention

[0005] This application provides a valve core connection structure and valve core assembly, designed for use in solid-containing media, high flow rates, and high-scour conditions, with a valve stem made of metal and a valve core made of fragile material. This structural design ensures a reliable connection between the metal and superhard materials while also improving the superhard material's ability to withstand impact, thereby extending the life of the entire valve core assembly.

[0006] In the first aspect, a valve core connection structure is provided, which is used to connect the valve stem and the valve head. The valve core connection structure axially presses the valve stem annular step of the valve stem on the side close to the valve stem, and the valve core connection structure laterally presses the valve head on the side close to the valve head.

[0007] In conjunction with the first aspect, in certain implementations of the first aspect, the valve core connection structure includes:

[0008] A connecting gasket, which is annular and sleeved on the main stem of the valve stem;

[0009] A special-shaped connecting block, wherein the inner side surface of the upper end of the special-shaped connecting block is fixedly sleeved on the outer periphery of the connecting pad, and the inner side surface of the lower end of the special-shaped connecting block is matched with the concave-convex connecting structure of the valve head;

[0010] An integral connecting ring is sleeved on the outer periphery of the special-shaped connecting block. The top of the integral connecting ring is fixedly connected to the connecting pad by fixing screws. The lower inner side surface of the integral connecting ring abuts against the lower outer side surface of the special-shaped connecting block, so that the special-shaped connecting block and the valve head are laterally clamped.

[0011] The adjusting screw passes through the top of the integral connecting ring and the connecting gasket and protrudes inward, so that the adjusting screw is pressed tightly on the valve stem annular step, and the connecting gasket and the valve stem annular step are set at intervals.

[0012] In combination with the first aspect, in certain implementations of the first aspect, an annular protrusion is provided on the inner wall of the integral connecting ring, and an annular groove corresponding to the annular protrusion is provided on the outer side of the special-shaped connecting block.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the upper portion of the special-shaped connecting block overlaps the first gasket annular step of the connecting gasket.

[0014] In conjunction with the first aspect, in certain implementations of the first aspect, the integral connecting ring includes a connecting ring end face and a connecting ring side face; the lower end face of the connecting ring end face contacts the upper end face of the second gasket ring annular step of the connecting gasket, and the second gasket ring annular step is located above the first gasket ring annular step; the inner wall of the connecting ring side face cooperates with the outer periphery of the special-shaped connecting block;

[0015] The overall height of the connection gasket is smaller than the height between the lower end surface of the connection ring end surface and the upper surface of the valve stem annular step, and the height of the part of the special-shaped connection block overlapping the connection gasket is smaller than the height of the first gasket annular step.

[0016] The above content may correspond to Example 1.

[0017] In conjunction with the first aspect, in certain implementations of the first aspect, the valve core connection structure includes:

[0018] Special-shaped connecting block, the inner side of the special-shaped connecting block cooperates with the concave-convex connecting structure of the valve head;

[0019] An integral connecting ring is sleeved on the joint between the valve stem and the valve head and on the outer periphery of the special-shaped connecting block;

[0020] The adjusting screw passes through the top of the integral connecting ring and protrudes inward, so that the adjusting screw is pressed against the annular step of the valve stem, or the component below the adjusting screw is pressed against the annular step of the valve stem.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the lower inner side surface of the special-shaped connecting block cooperates with the concave-convex connecting structure of the valve head, and the upper portion of the special-shaped connecting block is sleeved on the main stem portion of the valve stem;

[0022] The upper end of the special-shaped connecting block is located above the annular step of the valve stem. By screwing the adjusting screw through the upper end of the integral connecting ring and the upper end of the special-shaped connecting block, the lower end of the adjusting screw protrudes from the lower side of the upper end of the special-shaped connecting block and contacts the annular step of the valve stem, so that there is a gap between the lower side of the upper end of the special-shaped connecting block and the upper end surface of the annular step of the valve stem.

[0023] The above content may correspond to Examples II and III.

[0024] In conjunction with the first aspect, in certain implementations of the first aspect, the valve core connection structure includes:

[0025] Special-shaped connecting block, the inner side of the special-shaped connecting block is matched with the valve stem annular step of the valve stem;

[0026] The integral connecting ring is sleeved on the outer periphery of the special-shaped connecting block and cooperates with the special-shaped concave-convex connecting structure of the valve head.

[0027] The above content may correspond to Examples IV and V.

[0028] In conjunction with the first aspect, in certain implementations of the first aspect, the valve core connection structure further includes:

[0029] The adjusting screw passes through the top of the integral connecting ring and protrudes inward, so that the adjusting screw is pressed against the annular step of the valve stem, or the component below the adjusting screw is pressed against the annular step of the valve stem.

[0030] The above content may correspond to Example V.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the outer periphery of the special-shaped connecting block and the inner periphery of the integral connecting ring are threadedly connected.

[0032] The above content may correspond to Example IV.

[0033] In combination with the first aspect, in certain implementations of the first aspect, the valve core connection structure further includes a fixing screw, which locks the special-shaped connection block or the integral connection ring in a horizontal state so that the special-shaped connection block clamps the concave-convex connection structure of the valve head from the side.

[0034] The above content may correspond to Examples II, III, and V.

[0035] In combination with the first aspect, in certain implementations of the first aspect, the valve core connection structure further includes a disc spring, and the disc spring is located between the valve stem and the valve head.

[0036] In combination with the first aspect, in certain implementations of the first aspect, the valve stem includes a valve stem groove, the valve stem groove is formed by an upward depression in the lower end surface of the valve stem, and the disc spring is disposed in the valve stem groove;

[0037] or,

[0038] The valve stem comprises a valve stem protruding step, which is formed by the lower end surface of the valve stem protruding outwards, and the disc spring is sleeved on the valve stem protruding step.

[0039] In combination with the first aspect, in certain implementations of the first aspect, the valve core connection structure also includes a connecting gasket, which is in the shape of a disc and is arranged between the valve stem and the valve head to prevent the valve stem or disc spring from directly acting on the valve head.

[0040] The above content may correspond to Examples III, IV, and V.

[0041] In combination with the first aspect, in certain implementations of the first aspect, the valve core connection structure further includes an annular connection gasket, which is sleeved on the docking position of the valve stem and the valve head to ensure the coaxiality of the valve stem and the valve head.

[0042] The above content may correspond to Example II.

[0043] In combination with the first aspect, in some implementations of the first aspect, there are multiple special-shaped connecting blocks used to form a circular ring body, with deformation gaps left between the blocks, or sealing gaskets made of soft material are clamped between the blocks.

[0044] In combination with the first aspect, in certain implementations of the first aspect, the top surface and side surfaces of the valve head are covered with a valve head covering material, and the valve head covering material is a soft material.

[0045] In combination with the first aspect, in certain implementations of the first aspect, the valve head includes an adjusting profile portion and a concave-convex connection structure; the basic profile of the adjusting profile portion is an equal percentage profile, a straight line profile, a parabolic profile, a quick-opening profile or one of their improved versions; the concave-convex connection structure is located on the side of the valve head and the side facing the valve stem, and the concave-convex structure constitutes a specific special-shaped surface.

[0046] In combination with the first aspect, in certain implementations of the first aspect, the adjusting surface portion is designed with a flow channel improvement structure, which is a plurality of streamlined grooves evenly distributed along the circumference, and the streamlined grooves are used to be set facing the incoming flow direction of the valve core assembly.

[0047] The above content may correspond to Examples I, II, III, IV, and V.

[0048] In a second aspect, a valve core assembly is provided, comprising a valve stem, a valve head, and the valve core assembly as described in any one of the implementations of the first aspect.

[0049] Compared with the existing technology, the solution provided by this application includes at least the following beneficial technical effects:

[0050] For situations where welding of a metal valve stem and superhard material is not feasible, the present invention provides a reliable connection structure and method that eliminates the need for welding. The connection structure provided by the present invention effectively prevents the superhard material valve head from becoming detached. By increasing the cushioning provided by the connection structure, the expected service life of the superhard material valve head under vibration and impact conditions is increased. The connection structure provided by the present invention is also removable, facilitating maintenance and reducing user maintenance costs to a certain extent.

[0051] The main features of the connection structure are: relatively soft materials covering the surface of the valve head, including but not limited to various plastic products such as PTFE, nylon, aflas, or soft metal materials such as copper; special-shaped connecting blocks for connecting the concave and convex connection structures of the valve head, the number of which is 1 to 20; an integral connecting ring for fixing the aforementioned 1 to 20 special-shaped connecting blocks; an adjustment screw for ensuring that the special-shaped connecting block clamps the valve head, which screw can also be replaced by a special disc spring; a fastening screw for ensuring a stable connection between the special-shaped connecting block and the integral connecting ring; and buffer blocks, sealing gaskets and other structures added to ensure the reliability of the aforementioned structure.

[0052] The connection structure can consist of 4 to 20 special-shaped connecting blocks forming a circular ring. These blocks securely connect the valve stem and valve head by clamping the concave and convex connection structure of the valve head. Each special-shaped connecting block is capable of elastic deformation along the valve stem's axial and circumferential directions within a certain range. The degree of deformation can be controlled by screws or other auxiliary structures. This can be used to adjust the clamping torque to avoid over-loosening or over-tightening, and to compensate for dimensional differences caused by unequal expansion of different materials at high temperatures.

[0053] The connection structure can also consist of a custom disc spring, a non-deformable, shaped connection block, an adjustment screw, or other auxiliary structures. The custom disc spring is located between the valve stem and the valve head. The shaped connection block secures the valve stem, custom disc spring, and valve head within it, securing the stem and valve head by clamping the concave and convex connection structure of the valve head. The preload force of the custom disc spring is adjusted using the adjustment screw and its auxiliary structure. This allows for adjusting the clamping torque to prevent over-loosening or over-tightening; it also compensates for dimensional differences caused by unequal expansion of different materials at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic structural diagram of a valve core assembly.

[0055] FIG2A is a schematic diagram of a valve head with different structures.

[0056] FIG2B is a schematic diagram of the three-dimensional structure of a valve head.

[0057] FIG2C is a schematic diagram of an application of a valve core assembly.

[0058] FIG3 is a schematic diagram of a valve core connection structure embodiment I.

[0059] FIG4 is a schematic diagram of a valve core connection structure embodiment II.

[0060] FIG5 is a schematic diagram of a valve core connection structure embodiment III.

[0061] FIG6 is a schematic diagram of a valve core connection structure embodiment IV.

[0062] FIG. 7 is a schematic diagram of an embodiment V of a valve core connection structure.

[0063] Explanation of the accompanying drawings: 1-valve stem; 2-valve head; 3-valve core connection structure; 10-valve core; 20-valve body; 30-valve seat; 131-integral connecting ring; 132-connecting gasket; 133-special-shaped connecting block; 134-valve head covering material; 135-valve head covering material; 136-adjusting screw; 137-fixing screw; 138-disc spring; 139-sealing gasket. DETAILED DESCRIPTION

[0064] The present application is described in further detail below with reference to the accompanying drawings and specific embodiments.

[0065] FIG1 is a schematic structural diagram of a valve core assembly provided in an embodiment of the present application. The valve core assembly may include a valve stem 1, a valve head 2, and a valve core connection structure 3. The top of the valve stem 1 has a threaded connection structure, and the bottom is adapted to the valve core connection structure 3. The material of the valve head 2 is a superhard and brittle material, including but not limited to ceramics, alloys, and other brittle and hard materials. The valve head 2 may include an adjustable surface portion and a concave and convex connection structure adapted to the valve core connection structure 3.

[0066] Figure 2A shows a schematic diagram of four adjustable profiles of the valve head 2, as shown in Figure 2A at 21A, 22A, 23A, and 24A. These profiles may include equal percentage profiles, linear profiles, parabolic profiles, quick-opening profiles, and the like. In other embodiments, non-standard profiles may be designed based on adjustment requirements. The concave-convex connection structure of the valve head 2, which mates with the valve core connection structure 3, may be a cylindrical surface 21B, a conical surface 22B, or specifically shaped surfaces 23B and 24B, as shown in Figure 2A.

[0067] Optionally, as shown in Figure 2B , the adjustment profile portion 25A of the valve head 2 can have a basic profile and grooves. The basic profile can be one of an equal-percentage profile, a linear profile, a parabolic profile, a quick-opening profile, or a modified version thereof, based on which 3 to 12 streamlined grooves are evenly distributed along the circumference. The concave-convex connection structure 25B of the valve head 2, which is adapted to the valve core connection structure 3, refers to Figure 2A . As shown in Figure 2C , during valve installation, the valve core assembly 10 is installed within the valve body 20 and engages with the valve seat 30. At this point, one of the grooves in the adjustment profile portion 25A should be aligned with the incoming flow direction indicated by the arrow, so that the flow direction of the medium within the groove interferes with the incoming flow, disrupting the incoming flow's inherent flow state. Furthermore, evenly distributing the incoming flow along the streamlined grooves can extend the service life of the valve head while also preventing impact on the valve body.

[0068] The concave-convex connection structures shown in the accompanying drawings corresponding to Examples I to III may refer to the specific profiled surface 23B shown in FIG. 2A , but the embodiments provided herein are not limited thereto. The concave-convex connection structures in Examples I to III may also be of other types. The concave-convex connection structures shown in the accompanying drawings corresponding to Examples IV to V may refer to the specific profiled surface 24B shown in FIG. 2A , but the embodiments provided herein are not limited thereto. The concave-convex connection structures in Examples IV to V may also be of other types.

[0069] Example 1

[0070] As shown in Figure 3, a valve core connection structure 3 may include an integral connection ring 131, a connection gasket 132, and a special-shaped connection block 133. 100I is a cross-sectional view through the centerline of an embodiment of a valve core connection structure, 100II is a cross-sectional view through the centerline and at 90 degrees to 100I, and 100III is a parts exploded view of an embodiment of a valve core connection structure.

[0071] The connecting washer 132 is annular. Its inner periphery is sleeved onto the main stem of the valve stem 1, and its outer periphery mates with the upper inner surface of the special-shaped connecting block 133. The lower end of the special-shaped connecting block 133 is special-shaped, and its lower inner surface mates with the concave-convex connection structure of the valve head 2.

[0072] The integral connecting ring 131 covers the outer circumference of the connecting pad 132 and the shaped connecting block 133. The upper portion of the integral connecting ring 131 is fixedly connected to the top of the connecting pad 132 via setscrews 137. The lower inner surface of the integral connecting ring 131 abuts the lower outer surface of the shaped connecting block 133, clamping the shaped connecting block 133 and the valve head 2. Tightening setscrews 137 downward moves the integral connecting ring 131 downward, squeezing the lower portion of the shaped connecting block 133 from the side, causing it to deform.

[0073] The end of the main stem portion of the valve stem 1 near the valve head 2 has a stem annular step. By screwing an adjustment screw 136 through the upper portion of the integral connecting ring 131 and the connecting washer 132, the lower end of the adjustment screw 136 protrudes from the underside of the connecting washer 132 and contacts the stem annular step, creating a space between the underside of the connecting washer 132 and the upper end surface of the stem annular step.

[0074] The lower end of the shaped connecting block 133 is a deformable, elastic structure. Adjustment screws 136 allow the mounting relationship between the various components of the valve core connecting structure 3 to be adjusted. Tightening adjustment screws 136 causes the connecting pad 132 to move away from the step at the lower end of the valve stem 1, increasing the axial deformation of the shaped connecting block 133. Furthermore, the lateral restraints of the integral connecting ring 131 and the lower end of the shaped connecting block 133 ensure more reliable clamping of the sides and top of the valve head 2 in both the circumferential and radial directions. This ensures that the valve stem 1 and valve head 2 are locked in all directions through the valve core connecting structure 3.

[0075] In embodiment I, the upper end of the connecting gasket 132 has a first gasket annular step and a second gasket annular step. The second gasket annular step is located above the first gasket annular step. The upper end of the special-shaped connecting block 133 is placed on the first gasket annular step. The integral connecting ring 131 includes a connecting ring end face and a connecting ring side face. The middle through hole of the connecting ring end face cooperates with the side face of the second gasket annular step of the connecting gasket 132. The lower side of the connecting ring end face contacts the end face of the second gasket annular step of the connecting gasket 132. The inner wall of the connecting ring side face cooperates with the outer periphery of the special-shaped connecting block 133. The inner wall of the connecting ring side face may be provided with a protrusion corresponding to the groove body of the special-shaped connecting block 133.

[0076] In Example 1, the internal height of the integral connecting ring 131 is required to ensure a secure abutment between the lower portion and the shaped connecting block 133, while also providing a sufficient travel range for the installation of the connecting gasket 132. Specifically, the height between the lower surface of the connecting ring end face and the upper surface of the valve stem annular step provides the installation travel of the connecting gasket 132. Therefore, the overall height of the connecting gasket 132 is less than the height between the lower surface of the connecting ring end face and the upper surface of the valve stem annular step. Furthermore, the top end face height of the shaped connecting block 133 can be less than the height of the first annular step of the connecting gasket 132.

[0077] In some embodiments, as shown in FIG3 , the special-shaped connecting block 133 can be composed of four or more blocks combined into a circular ring. A certain gap that allows deformation can be left between each block, or a sealing gasket made of soft material can be clamped between each block. An annular groove is provided on the outer side of the special-shaped connecting block 133, and multiple special-shaped connecting blocks 133 can be connected into a circle through the annular groove before assembly. The upper side of each special-shaped connecting block 133 is fixed to the outer side of the connecting gasket 132 by a screw. The annular groove of the special-shaped connecting block 133 cooperates with the annular protrusion on the inner wall of the integral connecting ring, thereby constraining the deformation of the special-shaped connecting block 133 in the axial direction of the valve stem 1.

[0078] In some embodiments, as shown in FIG3 , the top and side surfaces of the valve head 2 can be coated with valve head coating materials 134 and 135, respectively. Valve head coating materials 134 and 135 are soft materials to prevent the sides and top of the valve head 2 from being damaged when clamped by the special-shaped connecting block 133. Soft materials include, but are not limited to, various plastics such as PTFE, nylon, and aflas, or soft metals such as copper.

[0079] Example II

[0080] As shown in Figure 4 , similar to Example I, a valve core connection structure 3 may include an integral connection ring 131 and a special-shaped connection block 133. The top and side surfaces of the valve head 2 may be coated with valve head coating materials 134 and 135, respectively. The matching relationship between the various components of the valve core connection structure 3 in Example II differs slightly from that in Example I. Reference numeral 200-I is a cross-sectional view through the centerline of Example II of the valve core connection structure, reference numeral 200-II is a cross-sectional view through the centerline and at a 90-degree angle to reference numeral 200-I, and reference numeral 200-III is an exploded view of the components of another example of the valve core connection structure.

[0081] The integral connecting ring 131 is wrapped around the outer periphery of the special-shaped connecting block 133. The inner periphery of the upper end of the special-shaped connecting block 133 is sleeved onto the main stem of the valve stem 1. The lower end of the special-shaped connecting block 133 is special-shaped, and the lower inner surface of the special-shaped connecting block 133 mates with the concave-convex connection structure of the valve head 2. The outer periphery of the special-shaped connecting block 133 mates with the inner surface of the integral connecting ring 131.

[0082] In Example II, the special-shaped connecting block 133 can be composed of two or more pieces assembled into a circular ring. A gap can be left between the pieces to allow for deformation, or a sealing pad made of soft material can be sandwiched between the pieces. The two special-shaped connecting blocks 133a and 133b are fixedly connected by horizontal fixing screws 137. Tightening fixing screws 137 causes the special-shaped connecting blocks 133 to tighten inward, laterally clamping the special-shaped connecting blocks 133 and the valve head 2.

[0083] The end of the main stem portion of the valve stem 1, near the valve head 2, features a stem annular step. The upper end of the shaped connecting block 133 is positioned above the stem annular step. By threading an adjustment screw 136 through the upper end of the integral connecting ring 131 and the upper end of the shaped connecting block 133, the lower end of the adjustment screw 136 protrudes from the underside of the upper end of the shaped connecting block 133 and contacts the stem annular step, creating a gap between the underside of the upper end of the shaped connecting block 133 and the upper end surface of the stem annular step. Tightening the adjustment screw 136 increases the axial deformation of the shaped connecting block 133. Furthermore, the lateral restraint of the shaped connecting block 133 ensures more secure clamping of the sides and top of the valve head 2 in both the circumferential and radial directions. This ensures that the valve stem 1 and valve head 2 are locked in all directions through the valve core connection structure 3.

[0084] In Example II, the upper end of the special-shaped connecting block 133 has a connecting block annular step. The integral connecting ring 131 includes a connecting ring end face and a connecting ring side face. The central through-hole of the connecting ring end face mates with the side face of the connecting block annular step of the special-shaped connecting block 133. The lower side of the connecting ring end face contacts the end face of the connecting block annular step of the special-shaped connecting block 133. The inner wall of the connecting ring side face mates with the outer side face of the special-shaped connecting block 133.

[0085] In Example II, the internal cavity height of the integral connecting ring 131 is required to ensure that the lower portion securely abuts the special-shaped connecting block 133, while the upper portion provides a travel distance for the installation of the special-shaped connecting block 133. In other words, the height space between the lower surface of the connecting ring end face and the upper surface of the valve stem annular step provides the installation travel distance of the special-shaped connecting block 133. Therefore, the upper end height of the special-shaped connecting block 133 is less than the height between the lower surface of the connecting ring end face and the upper surface of the valve stem annular step.

[0086] In some embodiments, as shown in FIG4 , the valve core connection structure 3 may further include a connection gasket 132. The connection gasket 132 is a circular ring-shaped part that is sleeved onto the outer side of the lower step of the valve stem 1 and the outer side of the upper portion of the valve head 2 through a central circular hole to ensure the coaxiality of the valve stem 1 and the valve head 2.

[0087] Example III

[0088] As shown in FIG5 , similar to Example II, a valve core connection structure 3 may include an integral connection ring 131, a connection gasket 132, and a special-shaped connection block 133. The top surface and side surfaces of the valve head 2 may be coated with a valve head coating material 134 and a valve head coating material 135, respectively. The matching relationship between the various components of the valve core connection structure 3 in Example III is slightly different from that in Example II. In addition, the valve core connection structure 3 in Example III may also include a disc spring 138. 300-I is a cross-sectional view of Example III of a valve core connection structure through the centerline, and 300-II is a cross-sectional view through the centerline and at a 90-degree angle to 300-I.

[0089] The integral connecting ring 131 covers the outer periphery of the special-shaped connecting block 133. The upper portion of the special-shaped connecting block 133 fits over the outer side of the special-shaped step at the lower end of the valve stem 1. The lower portion of the special-shaped connecting block 133 is special-shaped, and the lower inner surface of the special-shaped connecting block 133 mates with the concave-convex connection structure of the valve head 2. The outer periphery of the special-shaped connecting block 133 mates with the inner surface of the integral connecting ring 131.

[0090] In Example III, the special-shaped connecting block 133 can be composed of two or more pieces assembled into a circular ring. A gap can be left between the pieces to allow for deformation, or a sealing pad made of soft material can be sandwiched between the pieces. The two special-shaped connecting blocks 133a and 133b are fixedly connected by horizontal fixing screws 137. Tightening fixing screws 137 causes the special-shaped connecting blocks 133 to tighten inward, laterally clamping the special-shaped connecting blocks 133 and the valve head 2.

[0091] The valve stem 1 has a stem annular step and a stem groove at one end near the valve head 2. The stem annular step is located above the stem groove, and the stem groove is formed by an upward depression in the lower end surface of the valve stem 1. The stem annular step can be of a special shape.

[0092] In Example III, the integral connecting ring 131 includes an end face and a side face. The central through-hole of the end face engages with the main stem portion of the valve stem 1. The lower side of the end face contacts the upper end face of the special-shaped connecting block 133. The inner wall of the side face engages with the outer surface of the special-shaped connecting block 133.

[0093] The top of the integral connecting ring 131 is fixedly connected to the top of the shaped connecting block 133 by adjustment screws 136. There are multiple adjustment screws 136, each of varying lengths. Some adjustment screws 136 connect the integral connecting ring 131 to the shaped connecting block 133. When the remaining adjustment screws 136 are tightened, the lower ends of the adjustment screws 136 protrude from the underside of the upper end of the shaped connecting block 133 and contact the valve stem annular step, creating a gap between the underside of the upper end of the shaped connecting block 133 and the upper end surface of the valve stem annular step. Tightening the adjustment screws 136 increases the axial deformation of the shaped connecting block 133. Furthermore, the lateral restraints of the integral connecting ring 131 and the shaped connecting block 133 ensure more secure clamping of the sides and top of the valve head 2 in both the circumferential and radial directions. This allows the valve stem 1 and valve head 2 to be locked in all directions via the valve core connection structure 3.

[0094] In Example III, a disc spring 138 is fixed within the stem groove of the valve stem 1. The bottom surface of the stem groove is spaced apart from the upper end surface of the valve head 2 to provide space for the disc spring 138 to deform. The height of the stem groove is proportional to the deformation height of the disc spring 138. The inner cavity height of the special-shaped connecting block 133 is required to ensure that the valve head 2 is securely mounted at the bottom, while providing a distance between the valve stem 1 and the valve head 2 at the top, as well as space for the disc spring 138 to deform.

[0095] In Example III, the deformation and preload force of the disc spring 138 are adjusted by adjusting the depth of the valve stem groove of the valve stem 1, as well as the relative positions of the special-shaped connecting block 133 and the integral connecting ring 131, to ensure that the side of the valve head 2 remains compressed with the special-shaped connecting block 133 in both the axial and circumferential directions at different temperatures.

[0096] In some embodiments, as shown in FIG5 , the valve core connection structure 3 may further include a connection gasket 132. The connection gasket 132 may be disc-shaped and disposed between the valve stem 1 and the valve head 2. This ensures that the lower end of the valve stem 1 or the disc spring 138 does not directly act on the top of the valve head 2, thereby preventing damage to the valve head 2 due to stress concentration.

[0097] Example IV

[0098] As shown in Figure 6 , similar to Example III, a valve core connection structure 3 may include an integral connection ring 131, a connection gasket 132, a special-shaped connection block 133, and a disc spring 138. The top and side surfaces of the valve head 2 may be coated with valve head coating materials 134 and 135, respectively. The matching relationship between the various components of the valve core connection structure 3 in Example IV differs slightly from that in Example III. Furthermore, the valve core connection structure 3 in Example IV may not include the adjustment screw 136 and the fixing screw 137.

[0099] The upper portion of the integral connecting ring 131 is sleeved over the outer periphery of the shaped connecting block 133 and is fixedly connected to the shaped connecting block 133 via threads or other structural means. The shaped connecting block 133 fits over the outer side of the shaped step at the lower end of the valve stem 1 and the upper outer side of the valve head 2. The shaped connecting block 133 ensures the coaxiality of the valve stem 1 and the valve head 2. The lower portion of the integral connecting ring 131 is shaped, and the inner side surface of the lower portion of the integral connecting ring 131 mates with the concave-convex connection structure of the valve head 2.

[0100] The end of the valve stem 1 near the valve head 2 has a first stem annular step and a second stem annular step. The first stem annular step is located above the second stem annular step. The first stem annular step can be of a different shape, and its outer diameter gradually increases from top to bottom. The outer diameter of the second stem annular step gradually increases from bottom to top.

[0101] The special-shaped connecting block 133 includes a connecting block end face and a connecting block side face. The central through hole of the connecting block end face cooperates with the outer side face of the first valve stem annular step of the valve stem 1. The inner wall of the connecting block side face cooperates with the outer side face of the valve head 2. A disc spring 138 is fixed to the second valve stem annular step of the valve stem 1. The lower side of the connecting block end face is spaced apart from the upper end face of the valve head 2 to avoid contact with the valve head 2. The space between the step surface of the second valve stem annular step and the upper surface of the valve head 2 is the deformation space of the disc spring 138. The height of the second valve stem annular step is proportional to the deformation height of the disc spring 138.

[0102] In Example IV, the deformation and preload force of the disc spring 138 are adjusted by adjusting the relative positions of the special-shaped connecting block 133 and the integral connecting ring 131, ensuring that the side of the valve head 2 remains compressed with the integral connecting ring 131 in both the axial and circumferential directions at different temperatures.

[0103] In some embodiments, as shown in Figure 6 , the valve core connection structure 3 may further include a connection washer 132 , which may be disc-shaped and disposed between the valve stem 1 and the valve head 2 . This ensures that the lower end of the valve stem 1 or the disc spring 138 does not directly act on the top of the valve head 2, preventing damage to the valve head 2 due to stress concentration. Therefore, the space between the stepped surface of the second valve stem annular step and the upper end surface of the connection washer 132 provides deformation space for the disc spring 138 .

[0104] In some embodiments, the integral connecting ring 131 may be formed by combining multiple pieces into a circular ring, with gaps between the pieces allowing for deformation, or sealing gaskets made of soft materials may be sandwiched between the pieces.

[0105] Example V

[0106] As shown in FIG7 , similar to Example III, a valve core connection structure 3 may include an integral connection ring 131, a connection gasket 132, a special-shaped connection block 133, and a disc spring 138. The top surface and side surfaces of the valve head 2 may be coated with a valve head coating material 134 and a valve head coating material 135, respectively. The matching relationship of the various components of the valve core connection structure 3 in Example V is slightly different from that in Example III. 500-I is a cross-sectional view of Example V of a valve core connection structure through the centerline, 500-II is a cross-sectional view through the centerline and at 90 degrees to 500-I, and 500-III is an exploded view of the parts of Example V of a valve core connection structure.

[0107] The integral connecting ring 131 wraps around the outer periphery of the shaped connecting block 133. This shaped connecting block 133 fits over the outer side of the shaped step at the lower end of the valve stem 1 and the upper outer side of the valve head 2. This shaped connecting block 133 ensures the coaxiality of the valve stem 1 and valve head 2. The lower portion of the integral connecting ring 131 is shaped, and its lower inner surface mates with the concave-convex connection structure of the valve head 2.

[0108] In Example V, the integral connecting ring 131 can be composed of two or more pieces assembled into a circular ring. A gap can be left between the pieces to allow for deformation, or a sealing pad made of soft material can be sandwiched between the pieces. The two integral connecting rings 131a and 131b are fixedly connected by horizontal fixing screws 137. Tightening fixing screws 137 causes the integral connecting rings 131 to tighten inward, laterally clamping the integral connecting rings 131 and the valve head 2.

[0109] The end of the valve stem 1 near the valve head 2 has a first stem annular step and a second stem annular step. The first stem annular step is located above the second stem annular step. The first stem annular step can be of a different shape, and its outer diameter gradually increases from top to bottom. The outer diameter of the second stem annular step gradually increases from bottom to top.

[0110] The special-shaped connecting block 133 includes a connecting block end face and a connecting block side face. The central through hole of the connecting block end face cooperates with the outer side face of the first valve stem annular step of the valve stem 1. The inner wall of the connecting block side face cooperates with the outer side face of the valve head 2. A disc spring 138 is fixed to the second valve stem annular step of the valve stem 1. The lower side of the connecting block end face is spaced apart from the upper end face of the valve head 2 to avoid contact with the valve head 2. The space between the step surface of the second valve stem annular step and the upper surface of the valve head 2 is the deformation space of the disc spring 138. The height of the second valve stem annular step is proportional to the deformation height of the disc spring 138.

[0111] In Example V, the deformation and preload force of the disc spring 138 are adjusted by adjusting the relative positions of the special-shaped connecting block 133 and the integral connecting ring 131, ensuring that the side of the valve head 2 remains compressed with the integral connecting ring 131 in both the axial and circumferential directions at different temperatures.

[0112] In some embodiments, as shown in Figure 7 , the valve core connection structure 3 may further include a connection washer 132 , which may be disc-shaped and disposed between the valve stem 1 and the valve head 2 . This ensures that the lower end of the valve stem 1 or the disc spring 138 does not directly act on the top of the valve head 2, thereby preventing damage to the valve head 2 due to stress concentration. Therefore, the space between the stepped surface of the second valve stem annular step and the upper end surface of the connection washer 132 provides deformation space for the disc spring 138 .

[0113] In Example V, the integral connecting ring 131 comprises a first connecting ring end face, a connecting ring side face, and a second connecting ring end face. The connecting ring side face is disposed between the first and second connecting ring end faces. A central through-hole in the first connecting ring end face engages with the main stem portion of the valve stem 1. An adjustment screw 136 is also inserted through the first connecting ring end face. When the adjustment screw 136 is tightened, the lower end of the adjustment screw 136 protrudes from the underside of the first connecting ring end face and contacts the top surface of the special-shaped connecting block 133, creating a gap between the underside of the first connecting ring end face and the top surface of the special-shaped connecting block 133. The special-shaped connecting block 133 is pressed against the annular step of the first valve stem. Tightening the adjustment screw 136 increases the axial deformation of the integral connecting ring 131. Furthermore, the integral connecting ring 131, laterally clamping the special-shaped connecting block 133 via the fixing screw 137, ensures more reliable clamping of the side and top of the valve head 2 in both the circumferential and radial directions at different temperatures. Thus, the valve stem 1 and the valve head 2 can be locked in all directions through the valve core connection structure 3 .

[0114] Although the present invention is disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A valve core connection structure (3), the valve core connection structure (3) is used to connect a valve stem (1) and a valve head (2), characterized in that: The side of the valve core connection structure (3) close to the valve stem (1) axially presses the valve stem annular step of the valve stem (1), and the side of the valve core connection structure (3) close to the valve head (2) laterally presses the special-shaped concave-convex connection structure of the valve head (2).

2. The valve core connection structure (3) according to claim 1, characterized in that: The valve core connection structure (3) comprises: A connecting gasket (132), which is annular and sleeved on the main stem of the valve stem (1); A special-shaped connection block (133), wherein the inner side surface of the upper end of the special-shaped connection block (133) is fixedly sleeved on the outer periphery of the connection pad (132), and the inner side surface of the lower end of the special-shaped connection block (133) cooperates with the concave-convex connection structure of the valve head (2); An integral connecting ring (131), the integral connecting ring (131) is sleeved on the outer periphery of the special-shaped connecting block (133), the top of the integral connecting ring (131) is fixedly connected to the connecting pad (132) via a fixing screw (137), and the lower inner side surface of the integral connecting ring (131) abuts against the lower outer side surface of the special-shaped connecting block (133), so that the special-shaped connecting block (133) and the valve head (2) are laterally clamped; The adjusting screw (136) passes through the top of the integral connecting ring (131) and the connecting gasket (132) and protrudes inward, so that the adjusting screw (136) is pressed tightly against the valve stem annular step, and the connecting gasket (132) and the valve stem annular step are arranged at intervals.

3. The valve core connection structure (3) according to claim 2, characterized in that: The inner wall of the integral connection ring (131) is provided with an annular protrusion, and the outer side of the special-shaped connection block (133) is provided with an annular groove corresponding to the annular protrusion.

4. The valve core connection structure (3) according to claim 2 or 3, characterized in that: The upper part of the special-shaped connection block (133) overlaps the first gasket annular step of the connection gasket (132).

5. The valve core connection structure (3) according to claim 4, characterized in that: The integral connecting ring (131) comprises a connecting ring end face and a connecting ring side face; the lower end face of the connecting ring end face contacts the upper end face of the second gasket ring annular step of the connecting gasket (132), and the second gasket ring annular step is located above the first gasket ring annular step; the inner wall of the connecting ring side face cooperates with the outer periphery of the special-shaped connecting block (133); The overall height of the connection gasket (132) is smaller than the height between the lower end surface of the connection ring end surface and the upper surface of the valve stem annular step, and the height of the portion of the special-shaped connection block (133) overlapping the connection gasket (132) is smaller than the height of the first gasket ring annular step.

6. The valve core connection structure (3) according to claim 1, characterized in that: The valve core connection structure (3) comprises: A special-shaped connection block (133), the inner side surface of the special-shaped connection block (133) cooperates with the concave-convex connection structure of the valve head (2); An integral connecting ring (131), the integral connecting ring (131) is sleeved at the joint between the valve stem (1) and the valve head (2), and is sleeved on the outer periphery of the special-shaped connecting block (133); The adjusting screw (136) passes through the top of the integral connecting ring (131) and protrudes inward, so that the adjusting screw (136) is pressed against the annular step of the valve stem, or the component below the adjusting screw (136) is pressed against the annular step of the valve stem.

7. The valve core connection structure (3) according to claim 6, characterized in that: The lower inner side surface of the special-shaped connection block (133) cooperates with the concave-convex connection structure of the valve head (2), and the upper part of the special-shaped connection block (133) is sleeved on the main stem of the valve stem (1); The upper end of the special-shaped connecting block (133) is located above the annular step of the valve stem. By screwing in the adjusting screw (136) through the upper end of the integral connecting ring (131) and the upper end of the special-shaped connecting block (133), the lower end of the adjusting screw (136) protrudes from the lower side of the upper end of the special-shaped connecting block (133) and contacts the annular step of the valve stem, so that a space exists between the lower side of the upper end of the special-shaped connecting block (133) and the upper end surface of the annular step of the valve stem.

8. The valve core connection structure (3) according to claim 1, characterized in that: The valve core connection structure (3) comprises: A special-shaped connecting block (133), the inner side surface of the special-shaped connecting block (133) matches the valve stem annular step of the valve stem (1); The integral connecting ring (131) is sleeved on the outer periphery of the special-shaped connecting block (133) and cooperates with the special-shaped concave-convex connecting structure of the valve head (2).

9. The valve core connection structure (3) according to claim 8, characterized in that: The valve core connection structure (3) further comprises: The adjusting screw (136) passes through the top of the integral connecting ring (131) and protrudes inward, so that the adjusting screw (136) is pressed against the annular step of the valve stem, or the component below the adjusting screw (136) is pressed against the annular step of the valve stem.

10. The valve core connection structure (3) according to claim 8, characterized in that: The outer periphery of the special-shaped connection block (133) and the inner periphery of the integral connection ring (131) are threadedly connected.

11. The valve core connection structure (3) according to any one of claims 6 to 9, characterized in that: The valve core connection structure (3) further comprises a fixing screw (137), wherein the fixing screw (137) locks the special-shaped connection block (133) or the integral connection ring (131) in a horizontal state, so that the special-shaped connection block (133) clamps the concave-convex connection structure of the valve head (2) from the side.

12. The valve core connection structure (3) according to any one of claims 6 to 11, characterized in that: The valve core connection structure (3) also includes a disc spring (138), and the disc spring (138) is located between the valve stem (1) and the valve head (2).

13. The valve core connection structure (3) according to claim 12, characterized in that: The valve stem (1) comprises a valve stem (1) groove, the valve stem (1) groove is formed by the lower end surface of the valve stem (1) being recessed upward, and the disc spring (138) is arranged in the valve stem (1) groove; or, The valve stem (1) comprises a valve stem (1) protruding step, which is formed by the lower end surface of the valve stem (1) protruding outwards, and the disc spring (138) is sleeved on the valve stem (1) protruding step.

14. The valve core connection structure (3) according to claim 12 or 13, characterized in that: The valve core connection structure (3) also includes a connection gasket (132) which is in the shape of a disc and is arranged between the valve stem (1) and the valve head (2) to prevent the valve stem (1) or the disc spring (138) from directly acting on the valve head (2).

15. The valve core connection structure (3) according to any one of claims 6 to 14, characterized in that: The valve core connection structure (3) also includes an annular connection gasket (132) which is sleeved on the butt joint of the valve stem (1) and the valve head (2) to ensure the coaxiality of the valve stem (1) and the valve head (2).

16. The valve core connection structure (3) according to any one of claims 2 to 15, characterized in that: There are multiple special-shaped connecting blocks (133) for forming a circular ring body, with deformation gaps left between the blocks, or sealing gasket blocks (139) made of soft material clamped between the blocks.

17. The valve core connection structure (3) according to any one of claims 1 to 16, characterized in that: The top surface and side surfaces of the valve head (2) are coated with a valve head coating material, and the valve head coating material is a soft material.

18. The valve core connection structure (3) according to any one of claims 1 to 17, characterized in that: The valve head (2) comprises an adjusting profile part and a concave-convex connection structure; the basic profile of the adjusting profile part is an equal percentage profile, a straight line profile, a parabola profile, a quick opening profile or one of their improved versions; the concave-convex connection structure is located on the side of the valve head and the side facing the valve stem, and the concave-convex structure forms a specific special-shaped surface.

19. The valve core connection structure (3) according to claim 18, characterized in that: The regulating profile part is designed with a flow channel improvement structure, which is a plurality of streamlined grooves evenly distributed along the circumference, and the streamlined grooves are used to be arranged facing the incoming flow direction of the valve core assembly.

20. A valve core assembly, characterized in that: The invention comprises a valve stem (1), a valve head (2) and a valve core assembly as claimed in any one of claims 1 to 19.

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