Plastic ball valve

Abstract

The utility model discloses a plastic ball valve, and relates to the technical field of valve structures. According to the integrally-formed plastic ball valve, the valve element serves as the insert and is subjected to injection molding with the valve body to form the integrally-formed plastic ball valve, due to the fact that the sealing structure does not participate in the integrally-formed process, the abutting force on the valve body in the insert injection molding process is small, deformation of the valve element cannot be caused, and the torque needed when the plastic ball valve is opened and closed can be reduced. In addition, through the design of a first sealing assembly, a first sealing ring and a second sealing ring are limited at the connecting position of the valve body and the valve element through a connecting pressing piece, an inclined face is formed on one side of the second sealing ring, and when water flow passes through, the first sealing ring can be continuously pushed to the direction of the second sealing ring when the water flow flows in the direction close to the valve element; and the sealing effect of the plastic ball valve is improved.

Description

Technical Field

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

[0002] Plastic ball valves are lightweight and corrosion-resistant ball valve structures used in various fields, such as general pure water and drinking water pipeline systems, drainage and sewage pipeline systems, brine and seawater pipeline systems, and acid, alkali, and chemical solution systems. The assembly of the valve body, valve core, and sealing gasket of plastic ball valves mainly involves two manufacturing methods: assembly type and one-piece injection molding type.

[0003] The prefabricated type involves manufacturing the valve body, valve core, valve stem, and sealing gasket separately and then assembling them. This type of valve body has a threaded gland at one end of its bore, resulting in uncertain locking and positioning, and making assembly difficult. The socket uses a threaded union to connect to the pipe, which has low pressure resistance and poor performance.

[0004] In one-piece injection molding, the valve core and sealing gasket are injection molded separately, and then the valve body is injection molded as an integral part of the valve body. During the injection molding of the valve body in one-piece injection molding, the two cores on the left and right sides of the mold apply a large pressure to the sealing gasket, causing it to compress and seal. When the valve core is squeezed by the sealing gaskets at both ends within the high-temperature, high-pressure mold, it is easily deformed. This results in the valve core rotating unevenly, jamming, and experiencing high resistance. Furthermore, gaps appear between the deformed valve core surface and the sealing gasket, failing to achieve a good sealing effect.

[0005] Since the plastic ball valves currently available on the market have two major drawbacks, namely low pressure bearing capacity which affects sealing performance and high opening and closing torque, a new type of ball valve is proposed to solve these problems.

[0006] In view of this, this utility model is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a plastic ball valve.

[0008] This utility model is implemented as follows:

[0009] In a first aspect, this utility model provides a plastic ball valve, including a valve body, a valve core, an operating component, and a first sealing component.

[0010] The valve core and valve body are integrally molded by insert injection molding. The valve core includes a core rod and a valve ball. The valve ball is housed in the valve body, and the core rod extends out of the valve body. The operating component is fixedly connected to the core rod of the valve core to control the rotation of the valve ball within the valve body.

[0011] The first sealing assembly includes a connecting clamping member, a first sealing ring, and a second sealing ring arranged sequentially. The connecting clamping member is fixedly connected to the wall of the through hole of the valve body. A sealing receiving groove is formed between the connecting clamping member, the second sealing ring, and the wall of the through hole of the valve body. The groove wall of the sealing receiving groove near the valve core is inclined, and the inclination direction from the groove opening to the bottom of the groove is towards the valve core. The first sealing ring is accommodated in the sealing receiving groove, and the side of the second sealing ring away from the first sealing ring contacts and abuts against the surface of the valve ball.

[0012] In an optional embodiment, the diameter of the through hole of the valve ball portion of the valve core is smaller than the diameter of the through hole of the valve body. When the valve core rotates to the point where the through hole of the valve core is coaxial with the through hole of the valve body, the area of ​​the valve ball portion protruding from the valve body is the sealing area, and the side of the second sealing ring away from the first sealing ring contacts and abuts against the sealing area.

[0013] In an optional embodiment, the second sealing ring includes a straight section and a protrusion. The protrusion protrudes from the straight section along the side near the valve ball. The end face of the protrusion away from the straight section contacts the wall surface of the through hole of the valve body. Both the straight section and the protrusion are in contact with the valve ball.

[0014] In an optional embodiment, the connection between the straight section and the protrusion does not contact the valve ball.

[0015] In an optional embodiment, the connecting clamping element is threaded to the wall of the through hole of the valve body.

[0016] In an optional embodiment, the inner wall surface of the connecting clamping member is provided with an anti-rotation part, which includes at least one of an inner corner structure, a protrusion, or a groove.

[0017] In an optional embodiment, a limiting protrusion is provided at the axis of the end of the valve ball away from the core rod, and a limiting groove is provided on the valve body corresponding to the limiting protrusion, with the limiting protrusion being accommodated in the limiting groove.

[0018] In an optional embodiment, the operating component includes an operating handle and a handle cover. The operating handle has a through hole at its center. The core rod is located inside the through hole of the operating handle and is fixed to the operating handle. The valve body is in contact with the operating handle. The handle cover is installed on the end face of the through hole of the operating handle.

[0019] In an optional embodiment, a third seal is also included, which is disposed at the connection between the valve body, the core rod, and the operating assembly.

[0020] In an optional embodiment, the valve body includes a first diameter portion and a second diameter portion, the diameter of the first diameter portion being larger than the diameter of the second diameter portion, and a first sealing assembly being mounted on the second diameter portion.

[0021] This utility model has the following beneficial effects:

[0022] This invention provides a plastic ball valve, which is integrally formed by injection molding the valve core as an insert with the valve body. Since the sealing structure does not participate in the integral molding process, the resistance force exerted on the valve body during the insert injection molding process is small, preventing valve core deformation and reducing the torque required for the plastic ball valve to open and close. Furthermore, through the design of the first sealing component, the connecting clamping member limits the first and second sealing rings at the connection between the valve body and the valve core. By forming a slope on one side of the second sealing ring, when water flows through, the water flow towards the valve core continuously pushes the first sealing ring towards the second sealing ring, improving the sealing effect of the plastic ball valve. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the plastic ball valve provided in an embodiment of the present utility model;

[0025] Figure 2 An exploded view of the structure of the plastic ball valve provided in this embodiment of the utility model;

[0026] Figure 3 A cross-sectional view of a plastic ball valve provided in an embodiment of this utility model;

[0027] Figure 4 for Figure 3 Enlarged view of the A-structure in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the connecting clamping member provided in an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the second sealing ring provided in an embodiment of the present invention.

[0030] Key component symbols: 100-Plastic ball valve; 110-Valve body; 111-Limiting groove; 112-First diameter section; 113-Second diameter section; 120-Valve core; 121-Core rod section; 122-Valve ball section; 1221-Sealing area; 1222-Limiting protrusion; 130-Operating assembly; 131-Operating handle; 132-Handle cover; 140-First sealing assembly; 141-Connecting clamping element; 1411-Anti-rotation part; 142-First sealing ring; 143-Second sealing ring; 1431-Straight section; 1432-Protrusion; 1433-Beveled surface; 144-Sealing receiving groove; 150-Third sealing element. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] First Embodiment

[0038] Please refer to Figure 1 and Figure 2 This embodiment provides a plastic ball valve 100, including a valve body 110, a valve core 120, an operating component 130, and a first sealing component 140.

[0039] The inventors discovered that plastic ball valves 100 generally come in two types: assembled and integrally injection molded. Assembled types suffer from numerous connection points, difficult positioning, and low pressure resistance. Existing integrally injection molded types treat the valve core 120 and sealing structure as inserts during injection molding. Since the valve core 120 and sealing structure are two independent structures, a large force is required to maintain their positions during injection molding. This can easily cause the valve core 120 to deform under stress, for example, changing from a spherical shape to an ellipsoid. This significantly affects the yield rate of the plastic ball valve 100 and increases the rotational resistance during use, negatively impacting the user experience.

[0040] Therefore, in this embodiment, the valve core 120 is first manufactured into the plastic ball valve 100, and then the valve core 120 is placed into the mold as an insert and injection molded with the valve body 110 to obtain an integrally formed valve core 120 and valve body 110 structure. Since the valve body 110 and valve core 120 are integrally formed, the assembly of the valve core 120 is eliminated, reducing the assembly difficulty of the plastic ball valve 100. In addition, during the integral molding process, only the valve core 120 and valve body 110 are molded together. The sealing structure is assembled after the valve core 120 and valve body 110 are molded. Therefore, during the insert injection molding process, the insert only has one structure, the valve core 120. The core used to control the position of the insert applies less pressure to the insert, and the valve core 120 will not deform, improving the yield of the plastic ball valve 100. At the same time, the plastic ball valve 100 rotates more smoothly during use, improving the user experience of the plastic ball valve 100.

[0041] Please refer to Figure 2 and Figure 3 Specifically, the valve core 120 includes a core rod portion 121 and a valve ball portion 122. The valve ball portion 122 is housed within the valve body 110, and the core rod portion 121 extends out of the valve body 110. The operating component 130 is fixedly connected to the core rod portion 121 of the valve core 120 and contacts and limits the movement of the valve ball portion 122 within the valve body 110, thereby controlling the opening and closing of the channel of the plastic ball valve 100.

[0042] In this embodiment, the through hole of the valve body 110 for water passage includes a first diameter portion 112 and a second diameter portion 113. The diameter of the first diameter portion 112 is larger than the diameter of the second diameter portion 113, and the end of the second diameter portion 113 away from the first diameter portion 112 contacts the valve ball portion 122 of the valve core 120.

[0043] In this embodiment, the first sealing component 140 is disposed on the second diameter portion 113 of the valve body 110. This not only facilitates the installation and positioning of the first sealing component 140, but also makes the diameter of the second diameter portion smaller than the diameter of the first diameter portion 112. Furthermore, since the first sealing component 140 is disposed on the second diameter portion 113, the inner diameter of the second diameter portion 113 is further reduced. When water flows into the plastic ball valve 100, the water pressure will push the first sealing component 140 towards the valve core 120, thereby ensuring the sealing performance between the valve core 120 and the valve body 110.

[0044] The first sealing assembly 140 is located in the through hole of the valve body 110 and is in contact with the valve core 120. Therefore, it can be understood that there are two sets of the first sealing assembly 140, which are respectively arranged on opposite sides of the valve core 120 to seal the area in contact between the valve core 120 and the valve body 110.

[0045] Please refer to Figure 4The first sealing assembly 140 includes a connecting clamping member 141, a first sealing ring 142, and a second sealing ring 143 arranged sequentially.

[0046] Please refer to the following: Figure 5 In this embodiment, the connecting clamping member 141 is threadedly connected to the second diameter portion 113 of the valve body 110, wherein the connecting clamping member 141 has an external thread and the second diameter portion 113 has an internal thread, and the two are threadedly engaged to prevent the connecting clamping member 141 from shifting.

[0047] Please refer to Figure 4 A sealing receiving groove 144 is formed between the walls of the through hole connecting the clamping member 141, the second sealing ring 143 and the valve body 110. The groove wall of the sealing receiving groove 144 near the valve core 120 is a slope 1433, and the inclination direction from the groove opening to the bottom of the groove is the direction close to the valve core 120. The first sealing ring 142 is accommodated in the sealing receiving groove 144, and the side of the second sealing ring 143 away from the first sealing ring 142 contacts and abuts against the surface of the valve ball 122.

[0048] The inclined surface 1433 on the wall of the sealing receiving groove 144 is located on one side of the second sealing ring 143, that is, the part where the second sealing ring 143 contacts the first sealing ring 142 is the inclined surface 1433. By setting the inclined surface 1433 and controlling its inclination direction, the cross-section of the sealing receiving groove 144 presents a trapezoidal structure. This not only achieves the limitation of the first sealing ring 142 in the sealing receiving groove 144, but also, when water flows into the through hole of the valve body 110, the pressure of the water flow causes the first sealing ring 142 to continuously move and squeeze towards the valve core 120, thereby making the contact between the second sealing ring 143 and the valve core 120 tighter and enhancing the sealing effect.

[0049] In this embodiment, in order to ensure the installation of the first sealing component 140, the diameter of the through hole of the valve ball portion 122 of the valve core 120 is smaller than the diameter of the through hole of the second diameter portion 113 of the valve body 110. After the first sealing component 140 is installed on the second diameter portion 113, the inner diameter of the second sealing ring 143 is equal to the diameter of the through hole of the valve ball portion 122, so as to ensure the stable installation of the second sealing ring.

[0050] In this embodiment, when the valve core 120 rotates to the point where the through hole of the valve core 120 is coaxial with the through hole of the valve body 110, the valve ball portion 122 protrudes from the arc-shaped area of ​​the valve body 110 to form a sealing area 1221. The side of the second sealing ring 143 away from the first sealing ring 142 contacts and abuts against the sealing area 1221 to achieve a sealing effect.

[0051] Please refer to the following: Figure 6In this embodiment, the second sealing ring 143 includes a straight section 1431 and a protrusion 1432. The protrusion 1432 protrudes from the straight section 1431 along the side near the valve ball 122. The end face of the protrusion 1432 away from the straight section 1431 contacts the second diameter portion 113 of the valve body 110. Both the straight section 1431 and the protrusion 1432 are in contact with the valve ball 122, and the connection between the straight section 1431 and the protrusion 1432 is not in contact with the valve ball 122.

[0052] Understandably, the cross-section of the second sealing ring 143 presents an L-shaped structure, but at the corner of the L-shape, the side away from the valve core 120 is cut to form a bevel 1433, so that a trapezoidal sealing receiving groove 144 is formed between the second sealing ring 143, the connecting clamping member 141, and the second diameter portion 113; the side of the L-shape near the valve core 120 does not contact the valve core 120, so as to reduce the resistance required for the valve core 120 to rotate in the valve body 110; both ends of the L-shaped structure near the valve core 120 are in contact with the sealing area 1221 of the valve core 120 to form a stable seal.

[0053] Please refer to Figure 5 In order to reduce the installation difficulty of the connecting clamping member 141, the inner wall surface of the connecting clamping member 141 is provided with an anti-rotation part 1411. In this embodiment, the anti-rotation part 1411 is an internal octagonal structure. In other embodiments, the anti-rotation part 1411 can also be an internal hexagonal, a protruding edge, or a groove structure.

[0054] Please refer to Figure 3 In this embodiment, a limiting protrusion 1222 is provided at the axis of the end of the valve ball portion 122 away from the core rod portion 121, and a limiting groove 111 is provided on the valve body 110 corresponding to the limiting protrusion 1222. The limiting protrusion 1222 is accommodated in the limiting groove 111 so that the valve core 120 is positioned when it rotates in the valve body 110.

[0055] In this embodiment, the operating component 130 includes an operating handle 131 and a handle cover 132. The operating handle 131 has a through hole in its center. The core rod 121 is located in the through hole of the operating handle 131 and is fixed to the operating handle 131. The valve body 110 is in contact with the operating handle 131. The handle cover 132 is installed on the end face of the through hole of the operating handle 131.

[0056] In an optional embodiment, a third seal 150 is also included, which is disposed at the connection between the valve body 110, the core rod portion 121 and the operating component 130 to prevent water leakage at the connection.

[0057] By setting the operating component 130, the operator can rotate the valve core 120 within the valve body 110 by turning the operating handle 131, thereby completing the process control of the water flow ball valve opening and closing.

[0058] This embodiment provides a plastic ball valve 100, the assembly process and working principle of which are as follows:

[0059] First, valve core 120 is prepared. Then, valve core 120 is placed as an insert in the mold for preparing valve body 110. The core positions valve core 120, but no large pressure is required. Valve ball 122 of valve core 120 is accommodated in the mold of valve body 110, and core rod 121 extends out of the mold of valve core 120. Then, insert injection molding is performed on valve body 110 to obtain a structure in which valve body 110 and valve core 120 are integrally formed.

[0060] The second sealing ring 143 is installed into the second diameter portion 113 of the valve body 110. The straight section 1431 and the protrusion 1432 are both in contact with the sealing area 1221 on the valve ball portion 122. The connection between the straight section 1431 and the protrusion 1432 is not in contact with the valve ball portion 122, so as to reduce the resistance of the valve core 120 rotating in the valve body 110. Then, the first sealing ring 142 is installed into the second diameter portion 113 of the valve body 110 and is in contact with the inclined surface 1433 of the second sealing ring 143. Finally, the connecting clamping member 141 is threadedly installed into the second diameter portion 113 and the connecting clamping member 141 is in contact with the first sealing ring 142. This completes the installation of the first sealing assembly 140 on one side of the valve core 120. The installation process of the first sealing assembly 140 on the other side is the same.

[0061] After the first sealing assembly 140 is installed, the operating handle 131 is installed on the core rod portion 121 of the valve core 120 and is limited in position with the core rod portion 121. For example, a first limiting platform can be set in the through hole of the operating handle 131 and a second limiting platform can be set at the corresponding position of the core rod portion 121. The second limiting platform of the core rod portion 121 can be inserted into the through hole from the non-first limiting platform area of ​​the through hole. Then, the core rod portion 121 is rotated so that the first limiting platform and the second limiting platform are limited in position to prevent the operating handle 131 from coming out. A third sealing element 150 is installed at the connection between the operating handle 131, the valve body 110 and the core rod portion 121 to prevent water leakage. Finally, the handle cover 132 is placed over the through hole of the operating handle 131. A limiting strip can be provided on the handle cover 132. The limiting strip is accommodated in the through hole, which can not only improve the stability of the connection between the handle cover 132 and the operating handle 131, but also position the first limiting platform and the second limiting platform to prevent the operating handle 131 from disengaging from the valve core 120 due to their rotation.

[0062] Operating the handle 131 allows the valve core 120 to rotate within the valve body 110, thus opening and closing the channel. When the channel is open, water flows through the plastic ball valve 100, applying an overall force towards the valve core 120 to the first sealing assembly 140, enhancing the sealing effect. Simultaneously, since the contact point between the second sealing ring 143 and the valve ball 122 is not the entire sealing area 1221, and the valve ball 122 does not deform under stress during insert injection molding, the switching torque of the plastic ball valve 100 provided in this embodiment is reduced, resulting in smoother switching and rotation.

[0063] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A plastic ball valve characterized in that, The valve body, the valve core, the operating assembly and the first sealing assembly are included. The valve core is integrally formed with the valve body by insert injection molding, the valve core includes a core rod part and a valve ball part, the valve ball part is accommodated in the valve body, and the core rod part extends out of the valve body; the operating assembly is fixedly connected with the core rod part of the valve core to control rotation of the valve ball part in the valve body. The first sealing assembly includes a connecting compression part, a first sealing ring and a second sealing ring arranged in sequence; the connecting compression part is fixedly connected with the wall surface of the through hole of the valve body, a sealing accommodation groove is formed between the connecting compression part, the second sealing ring and the wall surface of the through hole of the valve body, the groove wall of the sealing accommodation groove close to the valve core is a slope, and the inclination direction from the groove opening to the groove bottom is the direction close to the valve core, the first sealing ring is accommodated in the sealing accommodation groove, and the side of the second sealing ring away from the first sealing ring is in contact with the surface of the valve ball part.

2. The plastic ball valve according to claim 1, characterized in that The diameter of the through hole of the valve ball part of the valve core is smaller than the diameter of the through hole of the valve body, when the valve core is rotated to the through hole of the valve core coaxial with the through hole of the valve body, the area of the valve ball part protruding from the valve body is a sealing area, and the side of the second sealing ring away from the first sealing ring is in contact with the sealing area.

3. A plastic ball valve according to claim 1 or 2, characterised in that The second sealing ring includes a straight section and a protruding part, the protruding part protrudes from the straight section along the side close to the valve ball part, the end surface of the protruding part away from the straight section is in contact with the wall surface of the through hole of the valve body, and the straight section and the protruding part are both in contact with the valve ball part.

4. The plastic ball valve according to claim 3, characterized in that The connection part of the straight section and the protruding part is not in contact with the valve ball part.

5. The plastic ball valve according to claim 1, wherein The connecting compression part is threadedly connected with the wall surface of the through hole of the valve body.

6. The plastic ball valve according to claim 5, characterized in that The inner wall surface of the connecting compression part is provided with a rotation stopping part, the rotation stopping part includes at least one of an internal angle structure, a convex rib or a groove.

7. The plastic ball valve according to claim 1, wherein A limiting protrusion is arranged at the axis of the end of the valve ball part away from the core rod part, the valve body is provided with a limiting groove corresponding to the limiting protrusion, and the limiting protrusion is accommodated in the limiting groove.

8. The plastic ball valve of claim 1, wherein, The operating assembly includes an operating handle and a handle cover, a through hole is formed in the center of the operating handle, the core rod part is located in the through hole of the operating handle and is limitingly fixed with the operating handle, the valve body is in contact with the operating handle, and the handle cover is installed on the end surface of the through hole of the operating handle.

9. The plastic ball valve according to claim 1 or 8, characterized in that A third sealing part is further included, and the third sealing part is arranged at the connection part of the valve body, the core rod part and the operating assembly.

10. The plastic ball valve of claim 1, wherein The valve body includes a first diameter part and a second diameter part, the diameter of the first diameter part is greater than the diameter of the second diameter part, and the first sealing assembly is installed on the second diameter part.

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