Eccentric semi-ball valve with bidirectional pressure-bearing and detachable functions

Abstract

The utility model relates to the field of valve products, in particular to an eccentric semi-ball valve with a bidirectional pressure-bearing detachable function, which solves the problems of insufficient sealing effect and difficulty in simple maintenance of the existing eccentric semi-ball valve, and comprises a valve body, a valve rod rotatably arranged in the valve body in a penetrating manner, and a valve cover and a lower end cover which are erected at the upper end and the lower end of the valve rod, a fluid channel with two water outlet ends is arranged on the valve body, a ball frame is installed on the valve rod, a spherical crown connected with the water outlet end on one side in a sealed mode is installed on the ball frame, a pressing ring matched with the spherical crown in a sealed mode is arranged at the water outlet end on the side, and a valve seat used for structural fixing is arranged on the outer side of the pressing ring. An inner concave ring groove is formed in the inner surface of the portion, close to one side of the spherical crown, of the pressing ring, an inner sealing piece used for being matched with the spherical crown in a sealed mode is embedded in the inner concave ring groove, an outer ring groove is formed in the outer surface of the circumference of the pressing ring, and an outer sealing piece used for being connected with the valve body in a sealed mode is installed in the outer ring groove.

Description

Technical Field

[0001] This utility model relates to the field of valve products, specifically to an eccentric hemispherical valve with bidirectional pressure-bearing and detachable function. Background Technology

[0002] An eccentric hemispherical valve consists of a valve body, an eccentric shaft, a ball crown, a valve seat, a bushing, and a valve cover. Its core feature is its eccentric crankshaft design, where the centerline of the ball crown is offset from the centerline of the valve flow channel. The ball is hemispherical, and opening and closing are achieved by rotating the eccentric shaft 90°. When opening, the ball crown completely disengages from the valve seat to avoid friction; upon closing, the ball crown contacts the valve seat to form a seal.

[0003] In existing structures, such as the technical solution with publication number CN 208816728 U, an eccentric ball valve is proposed, including a valve stem, a ball, a valve body, a valve seat, a sealing ring, and a pressure ring. The ball is connected to the valve stem disposed within the valve body, and the valve seat is disposed on the limiting step of the valve body. In use, the pressure ring is connected to the valve body and presses the sealing ring so that the sealing ring contacts and seals with the outer circle of the valve seat and the inner diameter surface of the valve body.

[0004] However, this sealing structure between the ball and the pressure ring relies solely on the contact between the two, which cannot guarantee a two-way seal for both inlet and outlet water. Furthermore, it is not easy to simply replace the seal during maintenance. Utility Model Content

[0005] Therefore, this utility model provides an eccentric hemispherical valve with bidirectional pressure bearing and detachable function, which solves the problems of insufficient sealing effect and difficulty in simple maintenance of existing eccentric hemispherical valves.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An eccentric hemispherical valve with bidirectional pressure-bearing and detachable function includes a valve body, a valve stem rotatably inserted within the valve body, and valve covers and a lower end cover supporting the upper and lower ends of the valve stem. The valve body has a fluid channel with two outlet ends. A ball frame is installed on the valve stem, and a spherical crown is installed on the ball frame to seal and connect with one outlet end. A pressure ring that seals and engages with the spherical crown is provided on the outlet end. A valve seat for structural fixation is provided on the outer side of the pressure ring. An inner concave annular groove is provided on the inner surface of the pressure ring located near the spherical crown. An inner sealing element for sealing and engaging with the spherical crown is embedded in the inner concave annular groove. An outer annular groove is provided on the outer circumference of the pressure ring, and an outer sealing element for sealing and connecting with the valve body is installed in the outer annular groove.

[0008] Preferably, the outer surface of the pressure ring located on one side of the concave annular groove is provided with a retraction annular groove to facilitate the insertion of the pressure ring into the valve body.

[0009] Preferably, the inner seal extends beyond the axial end face of the pressure ring.

[0010] Preferably, the pressure ring at the concave annular groove position has a plurality of threaded semi-hole structures evenly distributed thereon, and bolts for fixing the inner sealing element are screwed into the semi-hole structures, and the inner sealing element extends with an abutting end for contacting the bolts.

[0011] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0012] This utility model adopts a sealing structure by creating an inner concave annular groove at the inner end of the pressure ring and installing a corresponding elastic inner sealing element. The inner sealing element and the ball crown are sealed together, and a tight fit can be achieved between the inner sealing element and the ball crown regardless of whether pressure is applied in the forward or reverse direction. This simple structure enables bidirectional pressure bearing. When maintenance is required, the embedded inner sealing element can be directly removed for maintenance or replacement by simply opening the valve and turning the ball crown. This facilitates operation and simplifies the traditional maintenance method of disassembling and assembling the valve seat and pressure ring as a whole, making it highly convenient to use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0014] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point A;

[0015] Figure 3 This is a schematic diagram of the installation structure of the pressure ring and the inner seal in Embodiment 2 of this utility model;

[0016] Figure 4 This is a schematic diagram of the surface structure of the pressure ring in Embodiment 2 of this utility model.

[0017] Reference numerals: 1. Valve body; 2. Valve stem; 3. Valve cover; 4. Lower end cover; 5. Ball holder; 6. Ball crown; 7. Pressure ring; 71. Inner concave annular groove; 72. Inner seal; 721. Abutting end; 73. Outer annular groove; 74. Outer seal; 75. Relief annular groove; 76. Half-hole structure; 77. Bolt; 8. Valve seat. Detailed Implementation

[0018] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Example 1

[0019] refer to Figure 1 and Figure 2An eccentric hemispherical valve with bidirectional pressure-bearing and detachable function includes a valve body 1, a valve stem 2 rotatably inserted into the valve body 1, and valve covers 3 and lower covers 4 supporting the upper and lower ends of the valve stem 2. The valve body 1 is provided with a fluid channel with two water outlets. The valve stem 2 is a split structure (i.e., a support rod with separate upper and lower ends), and the middle part does not affect the fluid operation. A ball frame 5 is installed on the valve stem 2, and a ball crown 6 is installed on the ball frame 5 to be sealed and connected to one side of the water outlet. A pressure ring 7 is provided on the water outlet side to seal and cooperate with the ball crown 6. A valve seat 8 for structural fixation is provided on the outside of the pressure ring 7. The inner surface of the pressure ring 7 located near the ball crown 6 is provided with an inner concave annular groove 71. An inner sealing element 72 for sealing and cooperating with the ball crown 6 is embedded in the inner concave annular groove 71. An outer annular groove 73 is provided on the outer circumference of the pressure ring 7. An outer sealing element 74 for sealing and connecting with the valve body 1 is installed in the outer annular groove 73. This invention employs a sealing structure formed by creating an inner concave annular groove 71 at the inner end of the pressure ring 7 and installing a corresponding elastic inner sealing element 72. The inner sealing element 72 and the ball crown 6 are in a sealing fit, ensuring a tight fit regardless of whether pressure is applied in the forward or reverse direction. This simple structure achieves bidirectional pressure resistance. When maintenance is required, the embedded inner sealing element 72 can be easily removed for maintenance or replacement by simply opening the valve and turning the ball crown 6. This simplifies the traditional maintenance method of disassembling and reassembling the valve seat 8 and pressure ring 7 as a whole, greatly enhancing ease of use. Structurally, because the inner sealing element 72 is made of an elastic material, it extends beyond the axial end face of the pressure ring 7, allowing it to make frictional contact with the ball crown 6 when the valve is opened and closed, thus ensuring an elastic sealing structure.

[0020] Structurally, the outer surface of the pressure ring 7 located on one side of the concave annular groove 71 is provided with a relief annular groove 75 to facilitate the installation of the pressure ring 7 into the valve body 1. This relief annular groove 75 facilitates the installation of the pressure ring 7, reduces the axial dimension of the pressure ring 7, and reduces jamming and sticking caused by radial offset during installation, which is beneficial for initial installation. Example 2

[0021] refer to Figure 3 , Figure 4Compared to Embodiment 1, the pressure ring 7 at the concave annular groove 71 has several threaded semi-hole structures 76 evenly distributed on it. Bolts 77 for fixing the inner seal 72 are screwed into each semi-hole structure 76, and the inner seal 72 extends with an abutment end 721 for contacting the bolts 77. This structure, when applied to large-size ball valves (such as models 900 or 1000), allows maintenance personnel to easily reach into the valve to remove the bolts 77 and replace the inner seal 72. For large-size valves, this ensures the stability of the inner seal 72's installation structure and greatly guarantees the convenience of disassembly and assembly, thus meeting the invention's objective.

[0022] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An eccentric half-ball valve with bidirectional pressure-bearing detachable function, comprising a valve body (1), a valve rod (2) rotatably arranged in the valve body (1), and a valve cover (3) and a lower end cover (4) arranged on the upper and lower ends of the valve rod (2), characterized in that: The valve body (1) is provided with a fluid channel with two water outlets. A ball frame (5) is installed on the valve stem (2). A spherical crown (6) is installed on the ball frame (5) and sealed to one side of the water outlet. A pressure ring (7) is provided on the water outlet of this side and sealed to the spherical crown (6). A valve seat (8) for structural fixation is provided on the outside of the pressure ring (7). An inner concave annular groove (71) is provided on the inner surface of the pressure ring (7) located near the spherical crown (6). An inner sealing element (72) for sealing to the spherical crown (6) is embedded in the inner concave annular groove (71). An outer annular groove (73) is provided on the outer circumference of the pressure ring (7). An outer sealing element (74) for sealing to the valve body (1) is installed in the outer annular groove (73).

2. The eccentric half-ball valve with bidirectional pressure-bearing detachable function according to claim 1, characterized in that: The outer surface of the pressure ring (7) located on one side of the concave annular groove (71) is provided with a retraction annular groove (75) to facilitate the insertion of the pressure ring (7) into the valve body (1).

3. The eccentric half-ball valve with bidirectional pressure-bearing detachable function according to claim 1, characterized in that: The inner seal (72) extends out of the axial end face of the pressure ring (7).

4. The eccentric half-ball valve with bidirectional pressure-bearing detachable function according to claim 1 or 2 or 3, characterized in that: The pressure ring (7) at the concave annular groove (71) position has several threaded semi-hole structures (76) evenly distributed. The semi-hole structures (76) are screwed with bolts (77) to fix the inner seal (72). The inner seal (72) has an abutment end (721) extending on it for contacting the bolts (77).

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