Multi-stage sealing type ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to a multi-stage sealing type ball valve. The multi-stage sealing type ball valve solves the technical problem that in the prior art, a ball valve is poor in sealing performance. A multi-stage sealing type ball valve comprises a valve seat, and a valve cavity is formed in the valve seat. At least two valve cores are mounted in the valve cavity, and the at least two valve cores are arranged in the valve cavity in series; according to the ball valve, the at least two valve elements are arranged in the valve cavity in a series connection mode, the valve cavity is sealed by the at least two valve elements, and when one valve element leaks, the other valve elements are in a normal working state, so that the sealing characteristic of the ball valve is effectively improved, the ball valve is not prone to leakage in the long-term use process, and the stability of the ball valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a multi-stage sealed ball valve. Background Art

[0002] The opening and closing of a ball valve is realized by the seal between the valve ball and the valve seat. A ball valve is usually a one-way valve, that is, a ball valve usually conducts in one direction for injecting a medium. Due to the one-way conduction characteristic of the ball valve, it is usually installed at the outlet or similar positions.

[0003] The structure of the ball valve in the prior art is relatively simple, and usually a single valve ball is used to achieve sealing. This kind of ball valve is widely used because of its low cost. However, this kind of ball valve has poor sealing performance and there is a risk of leakage during long-term use.

[0004] Therefore, the ball valve in the prior art has the technical problem of poor sealing performance. Summary of the Invention

[0005] A multi-stage sealed ball valve provided by the utility model solves the technical problem of poor sealing performance of the ball valve in the prior art.

[0006] Some implementation schemes for solving the above technical problems include:

[0007] A multi-stage sealed ball valve includes a valve seat, and a valve cavity is formed in the valve seat;

[0008] A valve core is installed in the valve cavity. There are at least two valve cores, and at least two valve cores are arranged in series in the valve cavity;

[0009] The valve core includes a cylinder body and a valve ball arranged in the cylinder body. A sealing surface for cooperating with the valve ball to close the valve core is further arranged in the cylinder body, and a spring for pushing the valve ball to contact the sealing surface is arranged in the cylinder body;

[0010] A cover ring is further arranged on the cylinder body. One end of the spring contacts the valve ball, and the other end of the spring contacts the cover ring;

[0011] The cylinder body is hermetically connected to the valve cavity.

[0012] Preferably, the cover ring is fixed in the cylinder body by a thread.

[0013] Preferably, the cover ring is provided with an external thread, and the cylinder body is provided with an internal thread that cooperates with the external thread of the cover ring.

[0014] Preferably, the cylinder body and the valve cavity are sealed by a thread.

[0015] Preferably, the valve cavity is provided with an internal thread, and the cylinder body is provided with an external thread that cooperates with the internal thread in the valve cavity.

[0016] Preferably, an adhesive layer is provided between the cylinder and the valve cavity.

[0017] Preferably, the sealing surface of one of the valve cores is provided with grooves, and there are at least two turns of the grooves.

[0018] Preferably, there is a gap between two adjacent valve cores.

[0019] Preferably, the cover ring is provided with a convex ring, and the spring is sleeved on the convex ring.

[0020] Preferably, the convex ring and the cover ring are of an integral structure.

[0021] Compared with the prior art, the present utility model has the following advantages:

[0022] 1. By providing at least two valve cores, and the at least two valve cores are connected in series in the valve cavity, and the valve cavity is sealed by the at least two valve cores. When one valve core leaks, the other valve cores are in a normal working state. Therefore, the sealing performance of the ball valve is effectively improved, and the ball valve is not likely to leak during long-term use, and the stability of the ball valve is improved.

[0023] 2. By providing a cover ring, the arrangement of the cover ring makes it easy to assemble the valve core, reduces the manufacturing cost of the valve core, and moreover, the valve ball or the spring can be replaced independently, reducing the maintenance cost of the ball valve.

[0024] 3. The cylinder and the valve cavity are hermetically connected, which can prevent the leakage of the medium between the cylinder and the valve cavity, and further optimizes the sealing performance of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] For purposes of explanation, several embodiments of the technology of the present utility model are illustrated in the following drawings. The following drawings are incorporated into the present text and constitute a part of the specific embodiments. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring the concepts of the subject technology of the present utility model.

[0026] Figure 1 It is a schematic diagram of the internal structure of the present utility model.

[0027] Figure 2 is Figure 1 the enlarged view at A in

[0028] Figure 3 It is an exploded view of the present utility model.

[0029] Figure 4 It is an exploded view of the valve core.

[0030] As shown in the figure:

[0031] 1. Valve seat, 11. Valve cavity.

[0032] 2. Valve core, 21. Cylinder body, 22. Valve ball, 23. Spring, 24. Cover ring, 25. Groove. Detailed implementation mode

[0033] The following detailed implementation modes are intended as descriptions of various configurations of the subject technology of the present invention, and are not intended to represent the only configuration in which the subject technology of the present invention can be practiced. The detailed implementation modes include specific details intended to provide a thorough understanding of the subject technology of the present invention. However, it will be clear and obvious to those skilled in the art that the subject technology of the present invention is not limited to the specific details shown herein, and can be practiced without these specific details.

[0034] It can be understood that, herein, relational terms such as "first" and "second" are intended to distinguish one entity or operation from another entity or operation, and are not intended to expressly or implicitly imply any actual relationship or order between these entities or operations.

[0035] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0036] Referring to Figures 1 to 4 As shown, a multi-stage sealed ball valve includes a valve seat 1, and a valve cavity 11 is provided in the valve seat 1;

[0037] A valve core 2 is installed in the valve cavity 11, there are at least two valve cores 2, and at least two valve cores 2 are arranged in series in the valve cavity 11;

[0038] The valve core 2 includes a cylinder body 21 and a valve ball 22 arranged in the cylinder body 21. A sealing surface for closing the valve core 2 in cooperation with the valve ball 22 is further provided in the cylinder body 21, and a spring 23 for pushing the valve ball 22 to contact the sealing surface is provided in the cylinder body 21;

[0039] A cover ring 24 is further provided on the cylinder body 21. One end of the spring 23 contacts the valve ball 22, and the other end of the spring 23 contacts the cover ring 24;

[0040] The cylinder body 21 is hermetically connected to the valve cavity 11.

[0041] Under normal conditions, the spring 23 pushes the valve ball 22 into contact with the sealing surface to achieve the sealing of the valve cavity 11. At this time, the medium cannot be output through the valve cavity 11. When it is necessary to open the valve cavity 11, the valve cavity 11 is filled with the medium, and the pressure of the medium overcomes the acting force of the spring 23 to separate the valve ball 22 from the sealing surface, thereby realizing the opening of the valve cavity 11.

[0042] Referring to Figures 1 to 4 As shown, in some embodiments, the cover ring 24 is fixed to the inside of the cylinder body 21 by a thread.

[0043] The cover ring 24 is provided with an external thread, and the cylinder body 21 is provided with an internal thread that mates with the external thread of the cover ring 24.

[0044] The cover ring 24 is completely located inside the cylinder body 21, and an adhesive layer can be provided between the cover ring 24 and the cylinder body 21.

[0045] The cover ring 24 is connected to the cylinder body 21 by a thread. After the spring 23 or the valve ball 22 is damaged, the cover ring 24 can be opened for replacement, making the maintenance of the valve core 2 convenient. Both the spring 23 and the valve ball 22 can be replaced independently, reducing the maintenance cost of the valve core 2.

[0046] Referring to Figures 1 to 4 As shown, in some embodiments, the cylinder body 21 and the valve cavity 11 are sealed by a thread.

[0047] The valve cavity 11 is provided with an internal thread, and the cylinder body 21 is provided with an external thread that mates with the internal thread of the valve cavity 11.

[0048] An adhesive layer is provided between the cylinder body 21 and the valve cavity 11.

[0049] The cylinder body 21 is connected to the valve cavity 11 by a thread, and the cylinder body 21 can be conveniently taken out of the valve cavity 11, making the valve core 2 easy to maintain. By providing the adhesive layer, better sealing performance can be achieved between the cylinder body 21 and the valve cavity 11, and thus leakage of the ball valve can be effectively avoided, optimizing the sealing performance of the ball valve.

[0050] In some embodiments, a groove 25 is provided on the sealing surface of one of the valve cores 2, and the groove 25 has at least two turns.

[0051] By providing the groove 25, the contact area between the valve ball 22 and the sealing surface is reduced, making the contact between the valve ball 22 and the sealing surface tighter, and the manufacturing precision of the sealing surface and the valve ball 22 can be appropriately reduced. Moreover, by providing the groove 25, multiple seals can be formed, giving the valve core 2 better sealing performance.

[0052] In addition, since the sealing surface of one of the valve cores 2 is provided with a groove 25 and the sealing surfaces of the other valve cores 2 are not provided with the groove 25, it is not easy to affect the sealing performance of the ball valve as a whole. Usually, the sealing surface of the valve core 2 located in the innermost side is provided with the groove 25.

[0053] Referring Figures 1 to 4 As shown, in some embodiments, there is a gap between two adjacent valve cores 2.

[0054] When the innermost valve core 2 leaks, the medium will enter the gap. Since there is a certain pressure in the medium itself, at this time, the medium in the gap can exert an axial force on the cylinders 21 of the two valve cores 2, so that the threaded connection between the cylinder 21 and the valve cavity 11 is tighter. On the one hand, it can prevent the medium from leaking, and on the other hand, it can prevent the valve core 2 from loosening.

[0055] In some embodiments, the cover ring 24 is provided with a convex ring, and the spring 23 is sleeved on the convex ring.

[0056] The convex ring and the cover ring 24 are of an integral structure.

[0057] The setting of the convex ring is used to guide the spring 23. During long-term use, the spring 23 is not easy to bend, that is, the spring 23 is not easy to fail, which prolongs the service life of the ball valve, and the ball valve has good sealing performance.

[0058] The above introduces the technical solutions of the subject matter of the present invention and the corresponding details. It can be understood that the above introduction is only some implementation solutions of the technical solutions of the subject matter of the present invention, and some details can also be omitted during its specific implementation.

[0059] In addition, in some implementation solutions of the above utility model, it is possible to combine multiple implementation solutions. Due to space limitations, various combination solutions are not listed one by one. Those skilled in the art can freely combine and implement the above implementation solutions according to needs during specific implementation to obtain a better application experience.

[0060] When implementing the technical solutions of the subject matter of the present invention, those skilled in the art can obtain other detailed configurations or drawings according to the technical solutions of the subject matter of the present invention and the drawings. Obviously, without departing from the technical solutions of the subject matter of the present invention, these details still fall within the scope covered by the technical solutions of the subject matter of the present invention.

Claims

1. A multi-stage sealed ball valve, characterized in that: It includes a valve seat (1) with a valve cavity (11) therein; a valve core (2) is installed in the valve cavity (11), and there are at least two valve cores (2), and at least two valve cores (2) are arranged in series in the valve cavity (11); the valve core (2) includes a cylinder body (21) and a valve ball (22) arranged in the cylinder body (21), a sealing surface for closing the valve core (2) in cooperation with the valve ball (22) is further arranged in the cylinder body (21), and a spring (23) for pushing the valve ball (22) to contact the sealing surface is arranged in the cylinder body (21); a retaining ring (24) is further arranged on the cylinder body (21), one end of the spring (23) contacts the valve ball (22), and the other end of the spring (23) contacts the retaining ring (24); the cylinder body (21) is hermetically connected to the valve cavity (11).

2. The multi-stage sealed ball valve according to claim 1, wherein: The retaining ring (24) is fixed in the cylinder body (21) by threads.

3. The multi-stage sealed ball valve according to claim 2, wherein: The retaining ring (24) is provided with an external thread, and the cylinder body (21) is provided with an internal thread that mates with the external thread of the retaining ring (24).

4. The multi-stage sealed ball valve according to claim 1, wherein: The cylinder body (21) and the valve cavity (11) are sealed by threads.

5. The multi-stage sealed ball valve according to claim 4, characterized in that: The valve cavity (11) is provided with an internal thread, and the cylinder body (21) is provided with an external thread that mates with the internal thread in the valve cavity (11).

6. The multi-stage sealed ball valve according to claim 5, characterized in that: An adhesive layer is arranged between the cylinder body (21) and the valve cavity (11).

7. The multi-stage sealed ball valve according to claim 1, characterized in that: A groove (25) is arranged on the sealing surface of one of the valve cores (2), and the groove (25) has at least two turns.

8. The multi-stage sealed ball valve according to claim 1, wherein: There is a gap between two adjacent valve cores (2).

9. The multi-stage sealed ball valve according to claim 1, characterized in that: The retaining ring (24) is provided with a convex ring, and the spring (23) is sleeved on the convex ring.

10. The multi-stage sealed ball valve according to claim 9, characterized in that: The convex ring and the retaining ring (24) are of an integral structure.

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