Valve core structure and ball valve

Abstract

The utility model provides a valve core structure and ball valve.The valve core structure comprises a valve core body and a plugging block, the valve core body is provided with a first cavity section, a first circulation opening and a second cavity section which are sequentially arranged, the ends, deviating from each other, of the first cavity section and the second cavity section are provided with a first port and a second port respectively, the first circulation opening is arranged in an openable and closable mode, and the second circulation opening is arranged in an openable and closable mode. And the plugging block is movably arranged in the second cavity section, an overflowing gap is formed between the plugging block and the inner wall of the second cavity section, the plugging block is in stop fit with the position where the second port is located, and under the condition that fluid flows from the second port to the first port, the plugging block opens the second port, so that the fluid flows to the first port. And under the condition that fluid flows from the first port to the second port, the second port is plugged by the plugging block. According to the technical scheme, the problem that in the prior art, fluorine is added into a system of the ball valve from an opened valve core can be solved.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically, to a valve core structure and a ball valve. Background Technology

[0002] In related technologies, ball valves, as a commonly used fluid control device, are widely used in various refrigeration systems to control the flow of refrigerant. The structure of a ball valve mainly consists of a housing containing a spherical or cylindrical rotating body. The flow of fluid is controlled by the change in the position of this rotating body. In the valve design, when the valve core is open, bidirectional flow is possible between the inside and outside of the ball valve.

[0003] However, existing ball valves have a significant drawback in certain situations: when the system is low on refrigerant, maintenance personnel may mistakenly add refrigerant directly to the system through the ball valve's valve nozzle. This operation ignores the internal pressure of the system, potentially causing the refrigerant to be rapidly injected in liquid form under high pressure, triggering liquid slugging and causing liquid slugging damage (a common refrigeration system failure where liquid refrigerant cannot be effectively compressed during compression, generating shock waves inside the compressor that impact critical components such as pistons, valves, and bearings, ultimately damaging the compressor). This can damage the compressor and other components of the refrigeration system, and in severe cases, even lead to system failure or shortened lifespan. Utility Model Content

[0004] This invention provides a valve core structure and a ball valve to solve the problem in the prior art of adding refrigerant into the ball valve system through the open valve core.

[0005] To address the aforementioned problems, according to one aspect of this utility model, a valve core structure is provided, comprising a valve core body and a sealing block. The valve core body has a first cavity, a first flow port, and a second cavity arranged sequentially. The first cavity and the second cavity have a first port and a second port respectively at opposite ends. The first flow port is closable to connect or disconnect the first cavity and the second cavity. The sealing block is movably disposed within the second cavity, and a flow gap exists between the sealing block and the inner wall of the second cavity. The sealing block engages with the position of the second port. When fluid flows from the second port towards the first port, the sealing block opens the second port; when fluid flows from the first port towards the second port, the sealing block seals the second port.

[0006] Furthermore, the sealing block has a first abutting position, and an annular stop protrusion is provided on the inner side of the second port. The annular stop protrusion has a second abutting position. The first abutting position and the second abutting position stop cooperate to block or open the second port. When the first abutting position and the second abutting position abut, an annular sealing line or annular sealing surface for blocking the second port is formed between the first abutting position and the second abutting position.

[0007] Furthermore, the first contact position is an annular contact edge, an annular inclined surface, an annular arc surface, or a contact plane, and the second contact position is an annular contact edge, an annular inclined surface, an annular arc surface, or an annular plane, wherein the annular contact edge can be the edge of an annular inclined surface, an annular arc surface, an annular plane, or a contact plane.

[0008] Furthermore, the sealing block includes a mating section and a sealing section that are connected to each other. The mating section is a cylindrical structure with a clearance fit between its outer periphery and the inner wall of the second cavity section. The sealing section is a conical cylindrical structure that fits with the second abutment position stop of the annular stop protrusion. The outer periphery of the sealing section forms the first abutment position.

[0009] Furthermore, the sealing block is a spherical structure with at least one milled surface. At least a portion of the spherical surface of the sealing block is in clearance fit with the inner wall of the second cavity segment. The milled surface of the sealing block and the inner wall of the second cavity segment, at least a portion of the spherical surface or the milled surface of the sealing block form a first abutting position that cooperates with the second abutting position stop.

[0010] Furthermore, the sealing block is a spherical structure with two milled surfaces, which are parallel to each other and arranged opposite each other on both sides of the sealing block.

[0011] Furthermore, the inner opening of the annular stop protrusion facing the sealing block is a right-angle structure, or the inner opening of the annular stop protrusion facing the sealing block has a chamfer, or the inner opening of the annular stop protrusion facing the sealing block has a rounded corner. The sealing block cooperates with the right-angle edge, chamfer, or rounded corner of the right-angle structure, and the chamfer or rounded corner forms a second abutment position.

[0012] Furthermore, the valve core body includes an outer shell, a core shell, and a core rod. The outer shell has a through-hole inner cavity and a first port and a second port disposed opposite to each other at both ends of the inner cavity. The core shell passes through the inner cavity and divides the inner cavity into a first cavity segment and a second cavity segment. The core shell has a transition cavity and a first flow port. The core rod passes through the core shell and has a sealing element for blocking or opening the first flow port. The end of the sealing block opposite to the second port has a stop surface, which cooperates with the stop surface of the end of the core rod facing the second port.

[0013] Furthermore, the stop surface is a spherical surface or an arc-shaped surface.

[0014] Furthermore, the valve core body also includes an elastic reset structure, which is disposed inside the core housing. The outer periphery of the portion of the valve core located inside the core housing has a stop. The two ends of the elastic reset structure abut against the stop and the core housing, respectively, so that the valve core can reset and close the first flow port.

[0015] According to another aspect of the present invention, a ball valve is provided, the ball valve including a valve body and the above-mentioned valve core structure, the valve core body is disposed on the valve body, the second port extends into the cavity of the valve body, when fluid flows from the inner side of the cavity of the valve body towards the first port, the sealing block opens the second port under the action of the fluid, and when fluid flows from the first port towards the inner side of the cavity of the valve body, the sealing block seals the second port under the action of the fluid.

[0016] Furthermore, the outer periphery of the valve body has a limiting hole for limiting the installation of the valve core body. A flange structure is provided in the circumferential direction of the limiting hole. The flange structure extends in a direction away from the inner side of the cavity of the valve body, or the flange structure extends in a direction close to the inner side of the cavity of the valve body. The inner wall of the flange structure is limited and matched with the outer periphery of the valve core body.

[0017] Furthermore, the flange structure is an annular flange, or the flange structure includes multiple arc-shaped flange segments, which are spaced apart circumferentially along the limiting hole.

[0018] Furthermore, the outer periphery of the valve body has a limiting hole for limiting the installation of the valve core body, and a positioning part is provided between the limiting hole and the valve core body.

[0019] The present invention provides a valve core structure comprising a valve core body and a sealing block. The valve core body has a first cavity, a first flow port, and a second cavity arranged sequentially. The first cavity and the second cavity have a first port and a second port respectively at opposite ends. The first flow port is closable to connect or disconnect the first cavity and the second cavity. The sealing block is movably disposed within the second cavity, and there is a flow gap between the sealing block and the inner wall of the second cavity. The sealing block is engaged with the second port. When fluid flows from the second port to the first port, the sealing block opens the second port; when fluid flows from the first port to the second port, the sealing block seals the second port.

[0020] The valve core structure provided in this solution features a sealing block that moves within the second chamber under fluid pressure. When the first flow port is open, if the operator controls the fluid to flow from the second port to the first port, the sealing block will be pushed by the fluid and move towards the first port, opening the second port. Conversely, if the operator controls the fluid to flow from the first port to the second port, the sealing block will be pushed by the opposite fluid and move towards the first port, sealing the second port. This design utilizes the fluid's pushing action on the sealing block to achieve unidirectional flow control of the fluid flowing through the valve core structure. This ensures the vacuum function of the valve core structure (the operator controls the fluid to flow from the second port to the first port, i.e., the operator extracts fluid from the system through the valve core structure) while avoiding the erroneous operation of adding refrigerant to the system through an open valve core structure (the operator controls the fluid to flow from the first port to the second port, i.e., the operator injects refrigerant into the system through the valve core structure), effectively preventing damage such as liquid slugging caused by incorrect refrigerant addition and improving the safety of the valve core structure in the corresponding system. On the other hand, by setting the flow gap, the flow of fluid inside the valve core structure is ensured when the second port is opened, thus ensuring the normal use of the valve core structure. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A cross-sectional view of the valve core structure provided in an embodiment of the present invention is shown when the second port is blocked;

[0023] Figure 2 It shows Figure 1 A cross-sectional view of the valve core structure when the second port is open;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the sealing block in the valve core structure;

[0025] Figure 4 A schematic diagram of the sealing block of the valve core structure provided in another embodiment of the present invention is shown;

[0026] Figure 5 A cross-sectional view of a ball valve provided in another embodiment of the present invention is shown;

[0027] Figure 6 It shows Figure 5 A magnified view of position A in the middle.

[0028] The above figures include the following reference numerals:

[0029] 10. Valve core structure; 101. Flow clearance;

[0030] 11. Valve core body; 1101. First chamber section; 1102. Second chamber section; 1103. First flow port; 1104. First port; 1105. Second port; 111. Outer shell; 1111. Stop protrusion; 11111. Second abutment position; 112. Core shell; 113. Core rod; 1131. Sealing element; 114. Mounting cap;

[0031] 12. Sealing block; 1201. Milled surface; 1202. First abutment position; 1203. Stop surface; 121. Mating section; 122. Sealing section;

[0032] 20. Valve body; 21. Flanged structure. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] like Figures 1 to 4 As shown, an embodiment of this utility model provides a valve core structure 10, including a valve core body 11 and a sealing block 12. The valve core body 11 has a first cavity 1101, a first flow port 1103, and a second cavity 1102 arranged sequentially. The first cavity 1101 and the second cavity 1102 have a first port 1104 and a second port 1105 respectively at opposite ends. The first flow port 1103 is closable to connect or disconnect the first cavity 1101 and the second cavity 1102. 2. The sealing block 12 is movably disposed within the second cavity 1102 and has a flow gap 101 between the sealing block 12 and the inner wall of the second cavity 1102. The sealing block 12 is in stop engagement with the position of the second port 1105. When the fluid flows from the second port 1105 toward the first port 1104, the sealing block 12 opens the second port 1105. When the fluid flows from the first port 1104 toward the second port 1105, the sealing block 12 blocks the second port 1105.

[0035] In this embodiment, the sealing block 12 of the valve core structure 10 moves within the second cavity 1102 under fluid pressure, and when the first flow port is opened (e.g. Figure 1 and Figure 2 As shown), if the operator controls the fluid to flow from the second port 1105 to the first port 1104, the sealing block 12 will be pushed by the fluid and move towards the first port 1104, opening the second port 1105 (as shown). Figure 2 As shown), if the operator controls the fluid to flow from the first port 1104 to the second port 1105, the sealing block 12 will be pushed by the opposite fluid force, moving towards the first port 1104 and sealing the second port 1105 (as shown). Figure 1 (As shown). This configuration utilizes the fluid's push on the sealing block 12 to achieve unidirectional flow control of the fluid flowing through the valve core structure 10. This ensures the vacuum function of the valve core structure 10 (the operator controls the fluid to flow from the second port 1105 to the first port 1104, i.e., the operator extracts fluid from the system through the valve core structure 10), while avoiding the erroneous operation of adding refrigerant to the system from an open valve core structure 10 (the operator controls the fluid to flow from the first port 1104 to the second port 1105, i.e., the operator injects refrigerant into the system through the valve core structure 10), as is present in the prior art. This effectively prevents damage to the system caused by incorrect refrigerant addition, such as liquid slugging, and improves the safety of the valve core structure 10 in the corresponding system. Furthermore, by setting the flow gap 101, the flow of fluid within the valve core structure 10 is ensured when the second port 1105 is open, guaranteeing the normal operation of the valve core structure 10.

[0036] Specifically, the sealing block 12 has a first abutment position 1202, and an annular stop protrusion 1111 is provided on the inner side of the second port 1105. The annular stop protrusion 1111 has a second abutment position 11111. The first abutment position 1202 and the second abutment position 11111 cooperate to seal or open the second port 1105. When the first abutment position 1202 and the second abutment position 11111 are in contact, an annular sealing line or annular sealing surface is formed between the first abutment position 1202 and the second abutment position 11111 to seal the second port 1105. This arrangement, through the precise cooperation of the first abutment position 1202 and the second abutment position 11111, forms a stable and reliable sealing structure, ensuring an effective sealing effect. The design of the annular sealing line or annular sealing surface is beneficial to further increasing the contact area and sealing effect between the sealing block 12 and the annular stop protrusion 1111, which helps to ensure the reliability and stability of the sealing.

[0037] Optionally, the first abutting position 1202 is an annular abutting edge, an annular inclined surface, an annular arc surface, or an abutting plane, and the second abutting position 11111 is an annular abutting edge, an annular inclined surface, an annular arc surface, or an annular plane, wherein the annular abutting edge can be the edge of an annular inclined surface, an annular arc surface, or an annular plane.

[0038] In this embodiment, the annular abutment edge generally abuts with the annular inclined surface, the annular plane, and the abutment plane to form an annular sealing line; the annular inclined surface generally abuts with the annular arc surface to form an annular sealing line; the annular inclined surface abuts with an annular inclined surface with the same slope to form an annular sealing surface; the annular arc surface abuts with a matching annular arc surface to form an annular sealing surface; and the annular plane abuts with the annular plane and the annular plane abuts with the abutment plane to form an annular sealing surface.

[0039] Taking the contact between the annular plane and the contact plane as an example, in other embodiments not shown in the figure, the surface of the annular stop protrusion 1111 facing the side of the sealing block 12 forms a second contact position 11111 (annular plane), and the surface of the sealing block 12 facing the second port 1105 abuts against the second contact position 11111. The contact surface is the first contact position 1202 with the shape of a contact plane, and the two abut against each other to form an annular sealing surface.

[0040] The shapes of the first abutment position 1202 and the second abutment position 11111 can be adapted or adjusted according to actual conditions, and will not be listed here. It is understood that it is preferable to use an annular inclined surface, an annular arc surface, an annular plane, or an abutment plane as the abutment surface. This ensures that the annular sealing line or annular sealing surface between the sealing block 12 and the annular stop protrusion 1111 is formed by the abutment surface and the abutment line. While providing a good sealing effect, this avoids the situation where the abutment surface is easily damaged when the sealing block 12 and the annular stop protrusion 1111 are abutted by the abutment surface and the abutment line, since the structure where the abutment line is located is usually a corner edge, etc. This is conducive to improving the service life of the sealing block 12 and the annular stop protrusion 1111. Meanwhile, this arrangement also allows the sealing position of the sealing block 12 to be determined based on the two abutting surfaces, and the required annular sealing line or annular sealing surface to be obtained by processing different abutting surfaces. Specifically, when the first abutting position 1202 and the second abutting position 11111 are two surfaces of different shapes (e.g., the first abutting position 1202 is an annular inclined surface and the second abutting position 11111 is an annular arc surface), the abutment will mostly form an annular sealing line. When the first abutting position 1202 and the second abutting position 11111 are two surfaces of the same shape (e.g., the first abutting position 1202 is an annular inclined surface and the second abutting position 11111 is an annular inclined surface with the same slope), the abutment will mostly form an annular sealing surface.

[0041] Specifically, such as Figures 1 to 3 In the embodiment shown, the sealing block 12 includes a mating section 121 and a sealing section 122 connected to each other. The mating section 121 is a cylindrical structure with a clearance fit between its outer periphery and the inner wall of the second cavity section 1102. The sealing section 122 is a conical cylindrical structure that fits with the second abutment position 11111 of the annular stop protrusion 1111. The outer periphery of the sealing section 122 forms a first abutment position 1202.

[0042] In this embodiment, the clearance fit between the mating section 121 and the inner wall of the second cavity section 1102 ensures stable movement of the sealing block 12 within the second cavity section 1102 while forming the flow gap 101. The conical columnar structure of the sealing section 122, i.e., the first abutment position 1202, is an annular inclined surface, which closely fits with the second abutment position 11111 of the annular stop protrusion 1111 to form an annular sealing surface or annular sealing line. This arrangement facilitates the processing of the sealing block 12 and the formation of the flow gap 101 and the first abutment position 1202.

[0043] Furthermore, the inner opening of the annular stop protrusion 1111 facing the sealing block 12 is a right-angle structure, or the inner opening of the annular stop protrusion 1111 facing the sealing block 12 has a chamfer, or the inner opening of the annular stop protrusion 1111 facing the sealing block 12 has a rounded corner. The sealing block 12 cooperates with the right-angle edge, chamfer or rounded corner of the right-angle structure, and the right-angle edge, chamfer or rounded corner of the right-angle structure forms the second abutment position 11111.

[0044] In this embodiment, the inner opening of the annular stop protrusion 1111 facing the sealing block 12 has a chamfer with an inclination angle that matches the inclination angle of the annular inclined surface of the sealing section 122 of the conical column structure. The shape of the sealing block 12 is such that the first abutment position 1202 of the annular inclined surface and the second abutment position 11111 of the annular stop protrusion 1111, formed by the chamfered surface of the annular inclined surface, stop and cooperate, and the two abut to form an annular sealing surface. This arrangement helps to improve the fitting accuracy between the sealing block 12 and the annular stop protrusion 1111 and increase the abutment area between them, thereby improving the sealing effect and the reliability of the seal.

[0045] It is understood that in another embodiment (not shown), the inner opening of the annular stop protrusion 1111 facing the sealing block 12 has a rounded corner, and a second abutment position 11111 (annular arc surface) is formed at the rounded corner. The first abutment position 1202 of the sealing block 12, which is shaped like an annular inclined surface, and the second abutment position 11111 of the annular stop protrusion 1111, which is shaped like an annular arc surface, stop and cooperate to form an annular sealing line.

[0046] It is understood that, in another embodiment (not shown), the inner opening of the annular stop protrusion 1111 facing the sealing block 12 is a right-angle structure. The right-angled edge of the right-angled structure forms the second abutment position 11111 (annular abutment edge). The first abutment position 1202 of the sealing block 12, which is an annular inclined surface, and the second abutment position 11111 of the annular stop protrusion 1111, which is an annular abutment edge, stop and cooperate, forming an annular sealing line. In this embodiment, the right-angled edge is the edge of the inner plane (i.e., the annular plane) of the annular stop protrusion 1111.

[0047] Optionally, in another embodiment not shown in the figure, the inner opening of the annular stop protrusion 1111 facing the sealing block 12 has a chamfer, and the sealing section 122 is a cylindrical structure with an arc-shaped outer periphery that is concave in the axial direction. At this time, the annular arc-shaped surface of the outer periphery of the sealing section 122 is the first abutting position 1202, and the edge of the chamfer (which can also be understood as the edge of the annular inclined surface) is the second abutting position 11111. The two abut against each other to form an annular sealing line.

[0048] In this embodiment, the valve core body 11 includes a housing 111, a core shell 112, and a core rod 113. The housing 111 has a through-hole inner cavity and a first port 1104 and a second port 1105 disposed opposite to each other at both ends of the inner cavity. The core shell 112 passes through the inner cavity and divides the inner cavity into a first cavity segment 1101 and a second cavity segment 1102. The core shell 112 has a transition cavity and a first flow port 1103 serving as the opening of the transition cavity. The core rod 113 passes through the core shell 112 and has a sealing member 1131 for blocking or opening the first flow port 1103. The end of the sealing block 12 facing away from the second port 1105 has a stop surface 1203, which engages with the end of the core rod 113 facing the second port 1105.

[0049] The controllable flow of fluid is achieved through the combined design of the outer shell 111, core shell 112, and core rod 113 of the valve core body 11. When the valve core structure 10 is not needed, the sealing element 1131 blocks the first flow port 1103. Even if fluid enters from the second port 1105 and pushes the sealing block 12 to open the second port 1105, the fluid will not enter the first cavity section 1101 and flow out of the valve core structure 10. When the valve core structure 10 is needed, such as... Figure 1 and Figure 2 As shown, the operator moves the core rod 113, the sealing component 1131 moves and opens the first flow port 1103, at which point a vacuuming operation can be performed (e.g., Figure 2As shown), this allows fluid to flow from the second port 1105 to the first port 1104. The sealing block 12 opens the second port 1105 under the action of the fluid. The fluid in the system sequentially passes through the second port 1105, the second cavity 1102, the first flow port 1103, the first cavity 1101, and the transition cavity, and finally exits from the first port 1104. When the operator wants to inject fluid into the system through the valve core structure 10, the fluid sequentially flows through the first port 1104, the first cavity 1101 and the transition cavity, the first flow port 1103, and the second cavity 1102, pushing the sealing block 12 to seal the second port 1105 (as shown). Figure 1 As shown in the diagram, this design avoids damage caused by liquid hammer due to incorrect operation. This configuration allows for the addition of the sealing block 12 and the design to prevent misoperation without altering the original valve core structure 10. At the same time, the stop surface 1203 and the stop end of the core rod 113 facing the second port 1105 cooperate to restrict the movement of the sealing block 12 within the second cavity section 1102, ensuring the reliability and stability of the movement of the sealing block 12.

[0050] Preferably, the stop surface 1203 is a spherical or arc-shaped surface, which is beneficial for guiding the fluid and reducing flow resistance, such as... Figure 4 As shown, it is understandable that it is also possible to... Figure 3 Based on this, the stop surface 1203 is designed as a spherical surface or an arc surface.

[0051] Specifically, the valve core body 11 also includes an elastic reset structure, which is disposed inside the core shell 112. The outer periphery of the portion of the core rod 113 located inside the core shell 112 has a stop member. The two ends of the elastic reset structure abut against the stop member and the core shell 112 respectively, so that the core rod 113 can reset and close the first flow port 1103.

[0052] The elastic reset structure ensures that the valve core 113 can automatically reset and close the first flow port 1103 when no external force is applied, thereby improving the reliability and service life of the valve core structure 10, reducing manual intervention, and improving the automation level of the system.

[0053] Preferably, the valve core structure 10 further includes a mounting cap 114, which is installed on the valve core body 11 and blocks the first port 1104 when the valve core structure 10 is not in use. The mounting cap 114 and the valve core body 11 may be connected by threads.

[0054] In such Figure 4In another embodiment shown, the sealing block 12 is a spherical structure having at least one milled surface 1201. At least a portion of the spherical surface of the sealing block 12 is clearance-fitted with the inner wall of the second cavity 1102. The milled surface 1201 of the sealing block 12 is spaced from the inner wall of the second cavity 1102. At least a portion of the spherical surface or the milled surface 1201 of the sealing block 12 forms a first abutting position 1202 that cooperates with the second abutting position 11111 stop.

[0055] In this embodiment, the spherical structure of the sealing block 12 is matched with the limiting mechanism of the inner wall of the second cavity 1102, which ensures its limited movement within the cavity. The gap between the spherical surface and the inner wall of the second cavity 1102, and the gap between the milled surface 1201 and the inner wall of the second cavity 1102, form the flow gap 101, which provides a flow path for the fluid. The spherical surface or milled surface 1201 serves as the first abutment position 1202 (in one case, the milled surface 1201 is parallel to the axial direction, and the spherical surface faces downward to block the second port 1105, i.e., the first abutment position 1202 is an annular arc surface; in another case, the milled surface 1201 is perpendicular to the axial direction and located on the side close to the annular stop protrusion 1111, and the milled surface 1201 is used to block the second port 1105, i.e., the first abutment position 1202 is an abutment plane), cooperating with the stop of the second abutment position 11111, ensuring the smooth flow of fluid from the second port 1105 to the first port 1104 and the blockage of fluid from the first port 1104 to the second port 1105, thereby achieving unidirectional flow control of the valve core structure 10 during use while ensuring flowability.

[0056] Preferably, in this embodiment, the inner wall of the second cavity 1102 and the milled surface 1201 have a guide structure, or the inner wall of the second cavity 1102 and the spherical surface have a guide structure, so as to avoid the rotation of the sealing block 12 inside the second cavity 1102 and ensure the sealing of the spherical surface to the second port 1105.

[0057] like Figure 4As shown, the sealing block 12 is a spherical structure with two milled surfaces 1201, which are parallel to each other and arranged opposite each other on both sides of the sealing block 12. In this embodiment, the two milled surfaces 1201 of the sealing block 12 are parallel to the axial direction of the second cavity segment 1102 and are symmetrically arranged. The spherical surface between the two milled surfaces 1201 facing the second port 1105 forms the first abutment position 1202, and the plane that cooperates with the second abutment position 11111 can be understood as an annular arc surface. This configuration creates a flow gap 101 between the spherical surface and the inner wall of the second cavity 1102, and between the milled surface 1201 and the inner wall of the second cavity 1102. This provides a wider flow path for the fluid, improving fluid flow efficiency. The parallel arrangement of the two milled surfaces 1201 ensures stable movement of the sealing block 12 within the cavity. The spherical surface between the two milled surfaces 1201, facing the second port 1105, engages with the stop at the second abutment position 11111, ensuring a sealing effect while guiding the fluid from the second port 1105 to the first port 1104. It can be understood that the spherical surface between the two milled surfaces 1201, facing the first port 1104, engages with the end stop of the core rod 113, simultaneously guiding the fluid flowing from the first port 1104 to the second port 1105.

[0058] like Figures 5 to 6 As shown, another embodiment of the present invention provides a ball valve, which includes a valve body 20 and the valve core structure 10 described above. The valve core body 11 is disposed on the valve body 20, and the second port 1105 extends into the cavity of the valve body 20. When fluid flows from the inner side of the cavity of the valve body 20 toward the first port 1104, the sealing block 12 opens the second port 1105 under the action of the fluid. When fluid flows from the first port 1104 toward the inner side of the cavity of the valve body 20, the sealing block 12 seals the second port 1105 under the action of the fluid.

[0059] This embodiment utilizes the pushing action of the fluid on the sealing block 12 to achieve unidirectional flow control of the fluid flowing through the valve core structure 10. This ensures the vacuuming function of the valve core structure 10 (the operator controls the fluid to flow from the cavity of the valve body 20 to the first port 1104 of the valve core structure 10, i.e., the operator extracts the fluid from the valve body 20 through the valve core structure 10). At the same time, it avoids the erroneous operation of adding refrigerant to the valve body 20 from the open valve core structure 10 (the operator controls the fluid to flow from the first port 1104 to the cavity of the valve body 20, i.e., the operator injects refrigerant into the cavity of the valve body 20 through the valve core structure 10), which is common in the prior art. This effectively avoids damage to the ball valve, such as liquid hammer damage, caused by incorrect refrigerant addition, and helps improve the safety of the valve core structure 10 in the application of ball valves.

[0060] The valve body 20 has a limiting hole on its outer periphery for limiting the installation of the valve core body 11. A flange structure 21 is provided circumferentially on the limiting hole. The flange structure 21 extends away from the inner side of the cavity of the valve body 20, or extends closer to the inner side of the cavity of the valve body 20. The inner wall of the flange structure 21 is matched with the outer periphery of the valve core body 11 for limiting. This arrangement increases the contact area between the valve body 20 and the valve core body 11, improves the fixing strength between the valve core body 11 and the valve body 20, and ensures the stability and reliability of the valve core structure 10 during operation.

[0061] Optionally, the flange structure 21 is an annular flange, or the flange structure 21 includes multiple arc-shaped flange segments, which are spaced apart circumferentially along the limiting hole. The design of an annular flange or multiple arc-shaped flange segments not only improves the fixing strength between the valve core body 11 and the valve body 20, but also allows the shape and size of the flange structure 21 to be adjusted according to actual needs to adapt to different installation conditions. At the same time, it also improves the sealing performance between the valve core body 11 and the valve body 20, reducing the possibility of fluid leakage.

[0062] In another embodiment (not shown), the outer periphery of the valve body 20 has a limiting hole for limiting the installation of the valve core body 11, and a positioning part is provided between the limiting hole and the valve core body 11. In this embodiment, the limiting hole is arranged in steps, and the valve core body 11 is correspondingly provided with a stepped structure. The insertion position and depth of the valve core body 11 can be limited by the step abutment, which is beneficial to improving the installation effect.

[0063] In summary, this utility model provides a valve core structure 10 and a ball valve. By adding a sealing block 12 inside the valve core structure 10, it effectively prevents the incorrect addition of refrigerant from the valve core structure 10 to the valve body 20 under refrigerant shortage conditions, avoids possible liquid slugging damage to the ball valve, and improves the safety and stability of the ball valve.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0066] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve core structure, characterized in that, The valve core structure includes a valve core body (11) and a sealing block (12). The valve core body (11) has a first cavity (1101), a first flow port (1103), and a second cavity (1102) arranged sequentially. The first cavity (1101) and the second cavity (1102) have a first port (1104) and a second port (1105) respectively at opposite ends. The first flow port (1103) is closable to connect or disconnect the first cavity (1101) and the second cavity (1102). The sealing block (12) is movably arranged in the first cavity (1101) and the second cavity (1102). The second cavity (1102) has a flow gap (101) between the sealing block (12) and the inner wall of the second cavity (1102). The sealing block (12) is in stop engagement with the location of the second port (1105). When the fluid flows from the second port (1105) toward the first port (1104), the sealing block (12) opens the second port (1105). When the fluid flows from the first port (1104) toward the second port (1105), the sealing block (12) blocks the second port (1105).

2. The valve core structure according to claim 1, characterized in that, The sealing block (12) has a first abutting position (1202), and an annular stop protrusion (1111) is provided on the inner side of the second port (1105). The annular stop protrusion (1111) has a second abutting position (11111). The first abutting position (1202) and the second abutting position (11111) stop and cooperate to block or open the second port (1105). When the first abutting position (1202) and the second abutting position (11111) abut, an annular sealing line or annular sealing surface that blocks the second port (1105) is formed between the first abutting position (1202) and the second abutting position (11111).

3. The valve core structure according to claim 2, characterized in that, The first contact position (1202) is an annular contact edge, an annular inclined surface, an annular arc surface or a contact plane, and the second contact position (11111) is an annular contact edge, an annular inclined surface, an annular arc surface or an annular plane, wherein the annular contact edge can be the edge of an annular inclined surface, an annular arc surface, an annular plane or a contact plane.

4. The valve core structure according to claim 2, characterized in that, The sealing block (12) includes a mating section (121) and a sealing section (122) connected to each other. The mating section (121) is a cylindrical structure whose outer periphery is clearance-fitted with the inner wall of the second cavity section (1102). The sealing section (122) is a conical cylindrical structure that is stopped with the second abutment position (11111) of the annular stop protrusion (1111). The outer periphery of the sealing section (122) forms the first abutment position (1202).

5. The valve core structure according to claim 2, characterized in that, The sealing block (12) is a spherical structure having at least one milled surface (1201). At least a portion of the spherical surface of the sealing block (12) is clearance-fitted with the inner wall of the second cavity (1102). The milled surface (1201) of the sealing block (12) is spaced from the inner wall of the second cavity (1102). At least a portion of the spherical surface of the sealing block (12) or the milled surface (1201) forms the first abutting position (1202) that cooperates with the stop of the second abutting position (11111).

6. The valve core structure according to claim 5, characterized in that, The sealing block (12) is a spherical structure with two milled surfaces (1201), which are parallel to each other and arranged opposite to each other on both sides of the sealing block (12).

7. The valve core structure according to claim 2, characterized in that, The inner opening of the annular stop protrusion (1111) facing the sealing block (12) is a right-angle structure, or the inner opening of the annular stop protrusion (1111) facing the sealing block (12) has a chamfer, or the inner opening of the annular stop protrusion (1111) facing the sealing block (12) has a rounded corner. The sealing block (12) cooperates with the right-angle edge of the right-angle structure, the chamfer or the rounded corner stop, and the right-angle edge of the right-angle structure, the chamfer or the rounded corner forms the second abutment position (11111).

8. The valve core structure according to claim 1, characterized in that, The valve core body (11) includes a housing (111), a core shell (112), and a core rod (113). The housing (111) has a through-hole cavity and a first port (1104) and a second port (1105) disposed opposite to each other at both ends of the cavity. The core shell (112) passes through the cavity and divides the cavity into a first cavity segment (1101) and a second cavity segment (1102). The core shell (112) has a transition cavity and a first flow port (1103). The core rod (113) passes through the core shell (112) and has a sealing element (1131) for blocking or opening the first flow port (1103). The end of the sealing block (12) facing away from the second port (1105) has a stop surface (1203), which is in stop engagement with the end of the core rod (113) facing the second port (1105).

9. The valve core structure according to claim 8, characterized in that, The stop surface (1203) is a spherical surface or an arc-shaped surface.

10. The valve core structure according to claim 8, characterized in that, The valve core body (11) further includes an elastic reset structure, which is disposed inside the core shell (112). The outer periphery of the portion of the core rod (113) located inside the core shell (112) has a stop member. The two ends of the elastic reset structure abut against the stop member and the core shell (112) respectively, so that the core rod (113) can reset and close the first flow port (1103).

11. A ball valve, characterized in that, The ball valve includes a valve body (20) and a valve core structure as described in any one of claims 1 to 10. The valve core body (11) is disposed on the valve body (20). The second port (1105) extends into the cavity of the valve body (20). When fluid flows from the inner side of the cavity of the valve body (20) toward the first port (1104), the sealing block (12) opens the second port (1105) under the action of the fluid. When fluid flows from the first port (1104) toward the inner side of the cavity of the valve body (20), the sealing block (12) seals the second port (1105) under the action of the fluid.

12. The ball valve according to claim 11, characterized in that, The outer periphery of the valve body (20) has a limiting hole for limiting the installation of the valve core body (11). A flange structure (21) is provided in the circumferential direction of the limiting hole. The flange structure (21) extends away from the inner side of the cavity of the valve body (20), or the flange structure (21) extends close to the inner side of the cavity of the valve body (20). The inner wall of the flange structure (21) is limited and matched with the outer periphery of the valve core body (11).

13. The ball valve according to claim 12, characterized in that, The flange structure (21) is an annular flange, or the flange structure (21) includes multiple arc-shaped flange segments, which are spaced apart circumferentially along the limiting hole.

14. The ball valve according to claim 11, characterized in that, The outer periphery of the valve body (20) has a limiting hole for limiting the installation of the valve core body (11), and a positioning part is provided between the limiting hole and the valve core body (11).

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