Spring type conical plug valve structure

Abstract

According to the spring type conical plug valve structure, the inherent defects of a traditional structure are effectively overcome through the design of the internal spring, the spring is arranged above the plug valve element of the structure, the spring directly provides acting force in the axis direction of the plug, external dependence of external threads, a compression bolt, a grease injection hole and the like is abandoned, and the structure is simple and reliable. The opening and closing torque of the valve is obviously reduced, and the situation that the sealing performance is reduced due to thread damage or grease injection failure is avoided. Meanwhile, the inside and the outside of the valve are completely isolated through closed installation of the spring, external leakage points are reduced, the sealing reliability is improved, and the service life is prolonged by eliminating the influence of the external environment on the valve. The pre-tightening force of the spring can be accurately calculated according to the caliber of the valve, the stability of the sealing specific pressure is ensured, the installation process is further simplified, and immediate installation and immediate use are achieved. Through the compact and self-sufficient structural design, the maintenance cost and the operation difficulty are reduced, and meanwhile the sealing performance and the long-term operation stability of the plug valve are comprehensively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plug valves, and particularly to a spring-type conical plug valve structure. Background Art

[0002] As a key fluid control device, the conical plug valve is widely used in fields such as petroleum, chemical industry, and energy. Its core function depends on the sealing fit between the plug and the valve body. By applying a force along the axis of the plug, a sealing specific pressure is formed to achieve the opening and closing control of the valve. Traditional conical plug valves mainly include four typical structures: the fastening type, the packing type, the oil seal type, and the lifting type. The fastening type realizes sealing by tightening the plug with an external thread and a nut; the packing type relies on the axial force of the compressed packing for transmission; the oil seal type needs to maintain the pressure in the sealing cavity with the help of an external grease injection device; the lifting type adopts an operation mode of lifting first and then rotating. Although these structures can meet the basic requirements in specific scenarios, their design concepts all rely on external additional structures or operation steps, resulting in many limitations in practical applications.

[0003] In the prior art, the above structures generally have the following problems: First, the external threads of the fastening type plug valve are prone to damage under frequent adjustment or corrosive environments, leading to a decrease or even failure of the sealing force, and the maintenance cost of the thread structure is relatively high. Second, the sealing performance of the packing type plug valve is directly limited by the wear rate of the packing, and the packing needs to be replaced regularly and the gland adjusted, with a complex maintenance process. Although the oil seal type plug valve forms a sealing cavity through grease injection, the existence of the grease injection hole increases the risk of external leakage, and it relies on the continuous maintenance of the grease injection device, lacking in use convenience. The complex operation steps of the lifting type plug valve not only reduce efficiency but also exacerbate the friction between the plug and the valve body, shortening the valve life. More prominently, all the prior art needs to apply an axial force through an external structure (such as a thread, a gland, or a grease injection device), which not only increases the opening and closing torque of the valve and makes the operation difficult, but also affects the sealing stability due to the exposure of external components to environmental factors (such as corrosion, vibration), and leakage or sealing failure is likely to occur during long-term use.

[0004] Therefore, aiming at the problems of excessive torque, unstable sealing performance, high maintenance cost, and short service life existing in the existing conical plug valves, a new solution is urgently needed that can reduce the dependence on external devices through internal structure innovation while optimizing the sealing performance and operation efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a spring-type conical plug valve structure to solve the problems existing in the above prior art.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a spring - type conical plug valve structure, comprising:

[0008] A valve body, within which a fluid passage is provided;

[0009] A valve cover, which is fixed to the top of the valve body and has a mounting hole therein;

[0010] A valve stem, which is rotatably limited within the mounting hole. The top of the valve stem is in transmission connection with a manual actuator, and the bottom of the valve stem is connected with a valve core. The valve core is rotatably limited within the valve body, and a through - hole for communicating with the fluid passage is provided on the valve core;

[0011] A spring mechanism, which is arranged between the valve cover and the valve core.

[0012] Preferably, a lower bearing is provided at the lower part of the valve body, and the lower bearing cooperates with the lower part of the valve core.

[0013] Preferably, an upper bearing is provided at the upper part of the valve body, and the upper bearing cooperates with the upper part of the valve core.

[0014] Preferably, both between the valve body and the valve cover and between the valve cover and the manual actuator are connected by bolts, and nuts are provided on the bolts.

[0015] Preferably, a spiral - wound gasket is provided between the valve body and the valve cover.

[0016] Preferably, a straight - through grease cup is provided on the side of the valve cover.

[0017] Preferably, a bushing is provided between the valve cover and the valve stem, and a pressing plate is connected above the bushing by screws.

[0018] Preferably, O - ring seals are provided on both the inner and outer sides of the bushing.

[0019] Preferably, a graphite ring is also provided between the valve cover and the valve stem.

[0020] Preferably, the spring mechanism includes a spring, and an upper spring seat and a lower spring seat are respectively provided on the upper and lower sides of the spring.

[0021] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0022] A spring-type conical plug valve structure provided by the present invention effectively solves the inherent defects of the traditional structure through an internal spring design. A spring is arranged above the plug valve core in this structure, and the spring directly provides the acting force in the axial direction of the plug, eliminating external dependencies such as external threads, compression bolts, and grease injection holes. This significantly reduces the opening and closing torque of the valve, and avoids the decline in sealing performance caused by thread damage or grease injection failure. At the same time, the enclosed installation of the spring completely isolates the inside and outside of the valve, reduces the external leakage points, improves the sealing reliability, and extends the service life by eliminating the influence of the external environment on the valve. The pre-tightening force of the spring can be accurately calculated according to the valve diameter to ensure the stability of the sealing specific pressure, further simplifying the installation process and achieving ready-to-use installation. With a compact and self-sufficient structure design, the present invention comprehensively improves the sealing performance and long-term operation stability of the plug valve while reducing the maintenance cost and operation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of a spring-type conical plug valve structure provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the spring mechanism in a spring-type conical plug valve structure provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a spring-type conical plug valve structure to solve the problems existing in the prior art.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0029] Embodiment 1:

[0030] This embodiment provides a spring-type conical plug valve structure, as Figure 1 and2 As shown, including:

[0031] A valve body 1, wherein a fluid passage 2 is provided in the valve body 1;

[0032] A valve cover 3 is fixed to the top of the valve body 1, and a mounting hole 4 is provided in the valve cover 3;

[0033] The valve stem 5 is rotatably limited in the mounting hole 4. The top of the valve stem 5 is transmission-connected with the manual actuator 6. The bottom of the valve stem 5 is connected with a valve core 7. The valve core 7 is rotatably limited in the valve body 1. The valve core 7 is provided with a through hole for communicating with the fluid channel 2. Thus, by rotating the valve stem, the through hole can be connected to or staggered with the fluid channel 2, so that the plug valve has two states: open and closed. In the open state, Figure 1 As shown, the through hole is connected to the fluid channel 2, and the fluid can flow smoothly from one side to the other side; in the closed state, the axis of the through hole of the valve core 7 is perpendicular to the axis of the fluid channel 2, that is, the outer periphery of the valve core 7 can block the fluid channel 2, so the fluid cannot pass through at this time, thus, the fluid channel 2 can be closed or opened by rotating the valve stem 7 forward or reversely, and the structure is simple and easy to use;

[0034] The manual actuator 6 may include a worm and a worm wheel meshing with each other, and the worm wheel is key-connected with the valve stem 5; the worm is horizontally arranged on the valve cover 3, so that the rotation of the worm can drive the worm wheel to rotate, and then drive the valve stem 5 and the valve core 7 to rotate, thereby realizing the closing or opening of the fluid channel 2, wherein the rotation of the worm can be manually controlled or automatically controlled by a motor, and the present embodiment adopts the manual form;

[0035] The spring mechanism is arranged between the valve cover 3 and the valve core 7 .

[0036] As an implementation manner, a lower bearing 8 is provided at the lower portion of the valve body 1 , and the lower bearing 8 is matched with the lower portion of the valve core 7 .

[0037] As an implementation manner, an upper bearing 9 is provided on the upper portion of the valve body 1 , and the upper bearing 9 matches with the upper portion of the valve core 7 .

[0038] Through the above arrangement, the valve core 7 can rotate smoothly in the valve body 1, thereby improving the rotation effect.

[0039] As an implementation mode, the valve body 1 and the valve cover 3, as well as the valve cover 3 and the manual actuator 6 are connected by bolts 10, on which nuts 11 are provided. The bolts 10 can be used to press the valve cover 3 against the valve body 1, thereby ensuring the reliability of the seal. The nuts 11 can also play a role of pre-tightening and anti-loosening, further ensuring the reliability of the connection between the valve cover 3 and the valve body 1.

[0040] As an implementation mode, a spiral wound gasket 12 is provided between the valve body 1 and the valve cover 3 to avoid direct contact between the two.

[0041] As an embodiment, a straight-through pressure-injection oil cup 13 is provided on the side of the valve cover 3. In this way, by injecting filler into the cavity, the friction between the valve cover 3 and the valve stem 5 is increased, and the movement or shaking of the valve cover 3 relative to the valve stem 5 is reduced, thereby improving the sealing of the plug valve, preventing fluid leakage, and reducing safety hazards.

[0042] In the specific embodiment provided in the present disclosure, the straight-through pressure injection oil cup 13 can be configured in any suitable manner.

[0043] The filler can be any suitable material such as oil, fat, etc., and the present disclosure does not limit this. In the present disclosure, in order to facilitate operation, an arc handle is also provided on the straight-through pressure injection oil cup 13 to facilitate manual tightening.

[0044] As an implementation mode, a bushing 14 is provided between the valve cover 3 and the valve stem 5 , and a pressing plate 16 is connected to the top of the bushing 14 via screws 15 , so as to achieve a pressing installation of the bushing 14 .

[0045] As an implementation mode, O-rings 17 are provided on both the inner and outer sides of the bushing 14 to achieve a good sealing effect.

[0046] As an implementation mode, a graphite ring 18 is further provided between the valve cover 3 and the valve stem 5. Since the graphite ring 18 adopts a flexible graphite tape or a flexible graphite woven filler, it has the characteristics of high temperature resistance, corrosion resistance and wear resistance, and can be adapted to hot water, high-pressure steam, heat exchange fluid, organic solvents, hydrocarbons, cryogenic liquids and other media, thereby preventing the leakage of the filler and ensuring the sealing effect.

[0047] As an implementation mode, the spring mechanism includes a spring 19, and an upper spring seat 20 and a lower spring seat 21 are respectively provided on the upper and lower sides of the spring 19. The spring 19 directly provides the force in the axial direction of the plug, and eliminates external dependencies such as external threads, clamping bolts and grease injection holes, significantly reduces the valve opening and closing torque, and avoids the degradation of sealing performance caused by thread damage or grease injection failure; at the same time, the closed installation of the spring 19 completely isolates the inside and outside of the valve, reduces external leakage points, improves sealing reliability, and extends the service life by eliminating the influence of the external environment on the valve; the preload force of the spring 19 can be accurately calculated according to the valve caliber to ensure the stability of the sealing pressure ratio, further simplify the installation process, and realize ready-to-use, while reducing maintenance costs and operating difficulties, comprehensively improving the sealing performance and long-term operation stability of the plug valve.

[0048] The present invention uses specific examples to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A spring-loaded conical plug valve structure, characterized in that, Comprising: A valve body (1) with a fluid passage (2) provided therein; A valve cover (3) fixed to the top of the valve body (1), and an installation hole (4) provided in the valve cover (3); A valve stem (5) rotatably limited within the installation hole (4), the top of the valve stem (5) being in transmission connection with a manual actuator (6), the bottom of the valve stem (5) being connected with a valve core (7), the valve core (7) being rotatably limited within the valve body (1), and a through hole for communicating with the fluid passage (2) being provided on the valve core (7); A spring mechanism provided between the valve cover (3) and the valve core (7).

2. The spring-loaded conical plug valve structure according to claim 1, characterized in that, A lower bearing (8) is provided at the lower part of the valve body (1), and the lower bearing (8) is engaged with the lower part of the valve core (7).

3. The spring-loaded conical plug valve structure according to claim 1, characterized in that, An upper bearing (9) is provided at the upper part of the valve body (1), and the upper bearing (9) is engaged with the upper part of the valve core (7).

4. The spring-loaded conical plug valve structure according to claim 1, characterized in that, Both between the valve body (1) and the valve cover (3) and between the valve cover (3) and the manual actuator (6) are connected by bolts (10), and nuts (11) are provided on the bolts (10).

5. The spring-loaded conical plug valve structure according to claim 4, wherein, A wound gasket (12) is provided between the valve body (1) and the valve cover (3).

6. The spring-loaded conical plug valve structure according to claim 1, characterized in that, A straight-through grease cup (13) is provided on the side of the valve cover (3).

7. The spring-loaded conical plug valve structure according to claim 1, characterized in that, A bushing (14) is provided between the valve cover (3) and the valve stem (5), and a pressing plate (16) is connected above the bushing (14) by a screw (15).

8. The spring-loaded conical plug valve structure according to claim 7, characterized in that, O-ring seals (17) are provided on both the inner and outer sides of the bushing (14).

9. The structure of the spring-loaded conical plug valve according to claim 7, characterized in that, A graphite ring (18) is also provided between the valve cover (3) and the valve stem (5).

10. The spring-loaded conical plug valve structure according to claim 1, characterized in that, The spring mechanism includes a spring (19), and an upper spring seat (20) and a lower spring seat (21) are respectively provided on the upper and lower sides of the spring (19).

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