High-temperature stop valve

Abstract

The utility model belongs to the technical field of stop valves, and particularly relates to a high-temperature stop valve which comprises an executing mechanism, a valve body, a valve element and a corrugated pipe, the valve body is provided with an inlet and an outlet, the corrugated pipe is movably sleeved on the valve element, one end of the corrugated pipe is connected with the valve body in a sealing mode, and the other end of the corrugated pipe is connected with the valve element in a sealing mode. At least one part of the valve element is surrounded by the corrugated pipe, so that the part is not in direct contact with high-temperature fluid, the heat transfer form is mainly heat radiation transfer, and generally, the heat transfer coefficient of heat conduction and the heat transfer coefficient of heat radiation are not in the same magnitude and differ by more than one hundred times. According to the stop valve, heat transferred to the valve element by high-temperature fluid can be obviously reduced, so that high temperature can be effectively prevented from being transferred to an executing mechanism through the valve element, the stop valve can be smaller in size and lighter in weight, and the corresponding manufacturing cost can be lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves, and in particular relates to a high-temperature stop valve. Background Art

[0002] High-temperature valve technology is a type of globe valve specifically designed for handling high-temperature media (such as high-temperature steam, gas, and liquid). It plays a vital role in multiple industrial fields. The main functions of a globe valve are to prevent backflow of media, cut off or connect pipeline media, and regulate flow. When the flow direction of the media in the pipeline changes, the globe valve can quickly close to prevent reverse flow of the media, thereby protecting the normal operation of equipment and systems. When the pipeline needs to be closed, the globe valve can completely block the flow of media to ensure system safety. When the pipeline needs to be connected, the globe valve can be opened to allow the media to pass smoothly. The globe valve can precisely control the flow of media by adjusting the opening of the valve disc to meet the flow requirements under different operating conditions.

[0003] High-temperature globe valves are widely used in industries such as petrochemicals, electric power, metallurgy, and aerospace. In the petrochemical industry, they are often used to control the flow of crude oil and petrochemical products. In the power industry, especially in high-temperature and high-pressure environments such as thermal power plants and nuclear power plants, high-temperature globe valves are used to cut off or connect the medium in the pipeline to ensure safe and stable operation of the system.

[0004] The structure of high temperature stop valve is relatively simple, and it is easy to manufacture and maintain. Its working stroke is short, the opening and closing time is fast, and the sealing performance is good. Figure 1 As shown, the high-temperature globe valve is mainly composed of an actuator 1, a valve core 2, a valve body 3, a seal 4, and fins 5. The high-temperature medium enters the valve body 2 through the inlet 6 and is discharged through the outlet 7. The actuator 1 controls the vertical movement of the valve core 2 along the central axis to control the opening and closing of the globe valve. Because most actuators are electrical products and have strict operating temperature requirements, fins 5 are usually installed between the valve body 3 and the actuator 1 to ensure full contact between the valve body 3 and the cooling medium (normal temperature air or cooling medium), thereby reducing the temperature transferred from the valve body 3 to the actuator 1 through heat conduction. To prevent leakage of the high-temperature medium, a seal 4 is generally provided between the valve body and the valve core. This seal is generally made of high-temperature resistant material. Existing high-temperature globe valves have the following shortcomings:

[0005] Generally, actuators are electrical products that require a relatively low operating temperature. To ensure that the actuator is within the operating temperature range, fins need to be added to meet the cooling requirements. Therefore, in order to ensure that the actuator does not overheat, the high-temperature stop valve generally has a longer structure and a larger size.

[0006] Seals are in direct contact with high-temperature media. When the media temperature is high, high-temperature seals are limited in variety and expensive. To extend the life of seals, seals are typically placed as far away from the hot oil area as possible during structural design. Consequently, high-temperature stop valves are longer and larger in size.

[0007] The valve core and valve body will deform under high temperature conditions. Because the high-temperature stop valve is designed with a long structure, the coaxiality of the valve core and valve body must be high. Its processing is difficult and it is easy to cause the stop valve to stick during use.

[0008] The heat inside the high-temperature stop valve is mainly transferred through heat conduction. The high-temperature medium contacts the valve core and is directly transferred from the valve core to the actuator, which can easily cause the actuator to overheat and cause damage to the stop valve. Utility Model Content

[0009] The technical problem to be solved by the utility model is to provide a high-temperature stop valve with simple structure, small size, good sealing effect and high reliability.

[0010] The utility model provides a high-temperature stop valve, comprising an actuator, a valve body, a valve core and a bellows, wherein the valve body is provided with an inlet and an outlet, the bellows is movably sleeved on the valve core, and one end of the bellows is sealed with the valve body, and the other end is sealed with the valve core, so as to prevent the high-temperature fluid from transferring heat to the valve core.

[0011] Optionally, the valve core includes a valve stem connected to the actuator and a valve disc connected to one end of the valve stem, and both ends of the bellows are sealedly connected to the valve body and the valve disc respectively.

[0012] Optionally, the end surface of the valve flap is a conical or spherical structure, and the corresponding edge of the outlet is an adapted conical or spherical structure.

[0013] Optionally, the valve flap is threadedly connected to the valve stem.

[0014] Optionally, both ends of the bellows are respectively welded and fixed to the valve body and the valve disc.

[0015] Optionally, the distance between the inner wall of the bellows and the outer wall of the valve stem is not less than 2 mm.

[0016] Optionally, a partition is provided in the valve body, the valve core passes through the partition, the partition divides the interior of the valve body into an upper inner cavity and a lower inner cavity, the upper inner cavity is a cooling cavity, and two connecting holes are provided on the valve body, the cooling medium enters the upper inner cavity from one connecting hole and then flows out from the other connecting hole.

[0017] Optionally, the bellows is located in the lower inner cavity, one end of the bellows is sealed and connected to the partition, and the upper inner cavity is communicated with the interior of the bellows.

[0018] Optionally, the interior of the valve stem is a hollow structure, and the valve stem is provided with a through hole.

[0019] Optionally, the valve body includes a valve cover located at the top, and the valve cover is provided with a positioning hole for centering the valve core.

[0020] The beneficial effect of the present invention is that when the actuator controls the valve core to perform an action, the bellows will expand or contract, causing the valve core to close or open the outlet. The bellows surround at least a portion of the valve core, preventing that portion from directly contacting the high-temperature fluid. Therefore, the main form of heat transfer is thermal radiation. Generally, the heat transfer coefficient of thermal conduction and the heat transfer coefficient of thermal radiation are not on the same order of magnitude, differing by more than a hundred times. This can significantly reduce the heat transferred from the high-temperature fluid to the valve core, thereby effectively preventing the high temperature from being transferred through the valve core to the actuator. The stop valve can be made smaller and lighter, and its corresponding manufacturing cost will be lower. In addition, the bellows replaces the seal between the valve core and the valve body used to isolate the high-temperature fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an existing high-temperature stop valve;

[0022] Figure 2 This is a structural diagram of the high-temperature stop valve of the utility model.

[0023] In the figure: 10, actuator; 20, valve body; 201, inlet; 202, outlet; 203, partition; 204, upper inner cavity; 205, lower inner cavity; 206, connecting hole; 207, valve cover; 301, valve stem; 302, valve disc; 303, through hole; 40, bellows. DETAILED DESCRIPTION

[0024] like Figure 2 As shown, the utility model provides a high-temperature stop valve, including an actuator 10, a valve body 20, a valve core and a bellows 40. The valve body 20 has an inlet 201 and an outlet 202. The bellows 40 is movably mounted on the valve core, and one end of the bellows 40 is sealed with the valve body 20, and the other end is sealed with the valve core to prevent the high-temperature fluid from transferring heat to the valve core.

[0025] Compared to the prior art, the high-temperature shut-off valve provided by the present invention expands or contracts when the actuator 10 controls the valve core to execute an action, causing the valve core to close or open the outlet 202. The bellows 40 surrounds at least a portion of the valve core, preventing that portion from coming into direct contact with the high-temperature fluid. Therefore, heat transfer occurs primarily through radiation. Generally, the heat transfer coefficient of heat conduction and the heat transfer coefficient of heat radiation are not on the same order of magnitude, differing by more than a hundred times. This significantly reduces the amount of heat transferred from the high-temperature fluid to the valve core, effectively preventing the high temperature from being transferred through the valve core to the actuator 10. This allows the shut-off valve to be smaller and lighter, resulting in lower manufacturing costs. Furthermore, the bellows 40 replaces the seal between the valve core and the valve body 20, which is used to isolate the high-temperature fluid.

[0026] It should be noted that the actuator 10 drives the valve core to move along the center axis of the stop valve in an electric or manual manner to achieve the opening and closing function of the stop valve.

[0027] In one embodiment, the valve core includes a valve stem 301 connected to the actuator 10 and a valve flap 302 connected to one end of the valve stem 301. The ends of the bellows 40 are sealed to the valve body 20 and the valve flap 302, respectively. The upper inner cavity 204 communicates with the interior of the bellows 40. In this way, the bellows 40 can more fully surround the stem, reducing heat transfer to the stem, while not hindering the sealing engagement between the valve flap 302 and the outlet 202.

[0028] In one embodiment, the valve flap 302 is threadedly connected to the valve stem 301. This facilitates adaption to different valve flap 302 models and facilitates disassembly and maintenance of the valve core. Of course, the valve flap 302 and valve stem 301 can also be welded together, or the valve flap 302 and valve stem 301 can be integrally formed. It should be noted that the valve flap 302 and valve stem 301 can be designed as separate components, and they can be made of different materials. For example, the valve stem 301 can be made of high-strength, impact-resistant, and easy-to-process steel, while the valve flap 302 can be made of a high-temperature-resistant, low-thermal-conductivity ceramic material.

[0029] In one embodiment, both ends of the bellows 40 are welded to the valve body 20 and the valve flap 302 , respectively, to ensure sufficient connection stability and sealing, and to prevent high-temperature fluid from entering the bellows 40 .

[0030] In one embodiment, the distance between the inner wall of the bellows 40 and the outer wall of the valve stem 301 is not less than 2 mm to ensure that the inner wall of the bellows 40 and the valve stem 301 do not fit together.

[0031] In one embodiment, the end surface of the valve flap 302 is a conical or spherical structure, and the edge of the corresponding outlet 202 is a matching conical or spherical structure. This allows the valve flap 302 and the outlet 202 to form an inclined or curved seal, thereby improving the centering performance of the valve core and improving the sealing performance.

[0032] In one embodiment, a partition 203 is provided in the valve body 20, and the valve core passes through the partition 203. The partition 203 divides the interior of the valve body 20 into an upper inner cavity 204 and a lower inner cavity 205. The upper inner cavity 204 is a cooling cavity. Two connecting holes 206 are provided on the valve body 20. The cooling medium enters the upper inner cavity 204 from one connecting hole 206 and then flows out from the other connecting hole 206, so that the cooling medium can surround the upper half of the valve stem 301, further reducing the heat of the valve stem 301, so that the operating temperature of the actuator 10 is controlled within a reasonable range.

[0033] It should be noted that the cooling medium is air, water or oil.

[0034] In one embodiment, the bellows 40 is located in the lower inner cavity 205, with one end of the bellows 40 sealed to the partition 203, and the upper inner cavity 204 communicates with the interior of the bellows 40. Specifically, the partition 203 has a central hole through which the valve stem 301 passes. The space between the central hole and the valve stem 301 is sufficient to accommodate the end of the bellows 40, leaving a gap through which the cooling medium in the upper inner cavity 204 can enter the interior of the bellows 40 and directly cool the lower half of the valve stem 301.

[0035] In one embodiment, the interior of the valve stem 301 is a hollow structure, and a through-hole 303 is opened in the valve stem 301 , so that the cooling medium can enter the interior of the valve stem 301 through the through-hole 303 and flow out, further reducing the temperature of the valve stem 301 .

[0036] In one embodiment, the valve body 20 includes a valve cover 207 at the top. The valve cover 207 is provided with a positioning hole for centering the valve core. Specifically, the valve stem 301 is passed through the positioning hole and is clearance-fitted therein. The actuator 10 is located above the valve cover 207.

[0037] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0038] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this application.

Claims

1. A high-temperature stop valve, characterized in that: The invention comprises an actuator (10), a valve body (20), a valve core and a bellows (40), wherein the valve body (20) is provided with an inlet (201) and an outlet (202), and the bellows (40) is movably sleeved on the valve core, and one end of the bellows (40) is sealedly connected to the valve body (20), and the other end is sealedly connected to the valve core, so as to prevent high-temperature fluid from transferring heat to the valve core.

2. The high-temperature stop valve according to claim 1, characterized in that: The valve core comprises a valve stem (301) connected to the actuator (10) and a valve flap (302) connected to one end of the valve stem (301), and both ends of the bellows (40) are sealedly connected to the valve body (20) and the valve flap (302), respectively.

3. The high-temperature stop valve according to claim 2, characterized in that: The end surface of the valve flap (302) is a conical or spherical structure, and the corresponding edge of the outlet (202) is an adapted conical or spherical structure.

4. The high-temperature stop valve according to claim 3, characterized in that: The valve flap (302) is screwed to the valve stem (301).

5. The high-temperature stop valve according to claim 2, characterized in that: Both ends of the bellows (40) are respectively welded and fixed to the valve body (20) and the valve flap (302).

6. The high-temperature stop valve according to any one of claims 2 to 5, characterized in that: The distance between the inner wall of the bellows (40) and the outer wall of the valve stem (301) is not less than 2 mm.

7. The high-temperature stop valve according to any one of claims 2 to 5, characterized in that: A partition (203) is provided in the valve body (20), and the valve core passes through the partition (203). The partition (203) divides the interior of the valve body (20) into an upper inner cavity (204) and a lower inner cavity (205). The upper inner cavity (204) is a cooling cavity. Two connecting holes (206) are provided on the valve body (20). The cooling medium enters the upper inner cavity (204) from one of the connecting holes (206) and then flows out from the other of the connecting holes (206).

8. The high-temperature stop valve according to claim 7, characterized in that: The bellows (40) is located in the lower inner cavity (205), one end of the bellows (40) is sealedly connected to the partition (203), and the upper inner cavity (204) is in communication with the interior of the bellows (40).

9. The high-temperature stop valve according to claim 7, characterized in that: The interior of the valve stem (301) is a hollow structure, and a through-hole (303) is provided in the valve stem (301).

10. The high-temperature stop valve according to any one of claims 1-5, 8 and 9, characterized in that: The valve body (20) comprises a valve cover (207) located at the top, and a positioning hole is provided on the valve cover (207) for centering the valve core.

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