Low-temperature butterfly valve

Abstract

The utility model discloses a low-temperature butterfly valve, belongs to the technical field of valves, and solves the problem that when a butterfly valve is needed to block a low-temperature medium, the temperature can be isolated. Comprising an inner valve body and an outer valve body, two division bars are fixedly connected between the inner valve body and the outer valve body, the space between the inner valve body and the outer valve body is divided into a first cavity and a second cavity by the two division bars, and the outer valve body is communicated with a first connecting pipe and a second connecting pipe which are communicated with the first cavity and the second cavity respectively. The first connecting pipe and the first cavity are used for guiding air to enter and exit, the second connecting pipe and the second cavity are used for guiding low-heat-conductivity gas to enter and exit, and a first through hole and a second through hole which are communicated with the first cavity and the second cavity respectively are formed in the inner valve body. The situation that the temperature difference between the two sides of the butterfly valve is too large is avoided, and the situation that the inner diameter of the valve body or the inner wall of a pipeline deforms is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a cryogenic butterfly valve. Background Art

[0002] The butterfly valve, named after its unique butterfly-shaped valve plate, is an efficient and economical fluid control device. Its working principle is to regulate the flow of fluid by rotating the valve plate, and the tight fit between the valve plate and the valve seat ensures good sealing performance. The opening and closing action of the butterfly valve only requires a 90-degree rotation, which not only simplifies the operation process but also enables the butterfly valve to respond quickly, making it suitable for occasions that require frequent opening and closing. In addition, the streamlined design of the butterfly valve effectively reduces the resistance during fluid flow and improves energy efficiency.

[0003] During the transportation of cryogenic media by the butterfly valve, if the valve body and the pipeline always maintain a certain temperature, it is okay. However, if there is a large temperature difference change between the two when the butterfly plate blocks the valve body, the inner diameter of the valve body and the inner wall of the pipeline may be deformed. Therefore, when the butterfly valve blocks the cryogenic media, it is also necessary to isolate the temperature.

[0004] Therefore, a cryogenic butterfly valve is proposed to solve or alleviate the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art and propose a cryogenic butterfly valve.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cryogenic butterfly valve includes an inner valve body and an outer valve body. Two partition bars are fixedly connected between the inner valve body and the outer valve body. The two partition bars divide the space between the inner valve body and the outer valve body into cavity one and cavity two. The outer valve body is communicated with a first connecting pipe and a second connecting pipe that are respectively communicated with cavity one and cavity two. The first connecting pipe and cavity one are used to guide air in and out, and the second connecting pipe and cavity two are used to guide low-thermal-conductivity gas in and out. The inner valve body is provided with a first through hole and a second through hole that are respectively communicated with cavity one and cavity two. Solenoid valves are arranged in the first through hole and the second through hole, and a first valve plate and a second valve plate that close both ends of the inner valve body are rotatably connected inside the inner valve body.

[0008] Preferably, the low-thermal-conductivity gas is helium. The first connecting pipe is communicated with a first air pump, the second connecting pipe is communicated with a helium gas cylinder, and a second air pump is communicated with the second connecting pipe.

[0009] Preferably, a plurality of reinforcing bars are also fixedly connected between the outer circle of the inner valve body and the outer valve body.

[0010] Preferably, a first valve seat and a second valve seat which penetrate through the outer valve body and are communicated with the inside of the inner valve body are fixedly connected to the outer ring of the inner valve body. A first valve shaft and a second valve shaft are respectively rotatably connected in the first valve seat and the second valve seat. The first valve shaft and the second valve shaft are respectively fixedly connected to a first valve plate and a second valve plate, and the first valve plate and the second valve plate open and close synchronously.

[0011] Preferably, a first connecting cover and a second connecting cover are respectively fixedly connected to the upper ends of the first valve seat and the second valve seat. A servo motor is fixedly connected to the top surface of the first connecting cover. The output shaft of the servo motor is coaxially drivingly connected to the first valve shaft, and the first valve shaft and the second valve shaft are drivingly connected.

[0012] Preferably, a first bevel gear is fixedly connected to the first valve shaft, and a second bevel gear is fixedly connected to the second valve shaft. A transmission shaft is rotatably connected to both the first connecting cover and the second connecting cover. Both ends of the transmission shaft respectively penetrate into the first connecting cover and the second connecting cover, and third bevel gears are fixedly connected to both ends of the transmission shaft. The third bevel gears are drivingly connected to the first bevel gear and the second bevel gear.

[0013] Preferably, flange plates are fixedly connected to both ends of the inner valve body and the outer valve body.

[0014] The utility model has the following beneficial effects:

[0015] The utility model avoids the situation that the temperature difference on both sides of the butterfly valve changes too much, and avoids the deformation of the inner diameter of the valve body, the inner wall of the pipeline or the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a structural schematic diagram of the present utility model;

[0018] Figure 2 is Figure 1 the enlarged view of part A in

[0019] Figure 3 is a cross-sectional view of the present utility model;

[0020] Figure 4 is Figure 3 the enlarged view of part B in

[0021] Figure 5 is Figure 3 the enlarged view of part C in

[0022] 1. Inner valve body; 2. Flange; 3. Reinforcing strip; 4. Outer valve body; 5. First connecting pipe; 6. First cavity; 7. Second connecting pipe; 8. Second cavity; 9. First valve plate; 10. Second valve plate; 11. First valve seat; 12. Second valve seat; 13. First connecting cover; 14. Second connecting cover; 15. Second valve shaft; 16. Servo motor; 17. Transmission shaft; 18. Partition strip. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] A cryogenic butterfly valve, such as Figure 1 As shown, it includes an inner valve body 1 and an outer valve body 4, both ends of the inner valve body 1 and the outer valve body 4 are fixedly connected with a flange 2, two spacers 18 are fixedly connected between the inner valve body 1 and the outer valve body 4, and the two spacers 18 separate the inner valve body 1 and the outer valve body 4 to form a cavity 1 6 and a cavity 2 8, and a plurality of reinforcing strips 3 are fixedly connected between the outer ring of the inner valve body 1 and the outer valve body 4, as shown in FIG. Figure 4 and 5 As shown, the outer valve body 4 is connected with a connecting pipe 1 5 and a connecting pipe 2 7 which are connected with cavity 1 6 and cavity 2 8 respectively. The connecting pipe 1 5 and cavity 1 6 are used to guide the air in and out, and the connecting pipe 2 7 and cavity 2 8 are used to guide the low thermal conductivity gas in and out. The low thermal conductivity gas is helium. The connecting pipe 1 5 is connected with an air pump 1, the connecting pipe 2 7 is connected with a helium cylinder, and the connecting pipe 2 7 is connected with an air pump 2. The inner valve body 1 is provided with a through hole 1 and a through hole 2 which are connected with cavity 1 6 and cavity 2 8 respectively, and solenoid valves are arranged in the through hole 1 and the through hole 2.

[0030] like Figure 3 As shown, the inner valve body 1 is rotatably connected with a valve plate 1 9 and a valve plate 2 10 which close the two ends thereof. Figure 2 As shown, the outer ring of the inner valve body 1 is fixedly connected with a valve seat 11 and a valve seat 2 12 which penetrate the outer valve body 4 and communicate with the inner valve body 1, and the valve seats 11 and 12 are rotatably connected with valve shafts 1 and 15 respectively, and the valve shafts 1 and 15 are fixedly connected with valve plates 1 9 and 10 respectively, and the valve plates 1 9 and 10 are opened and closed synchronously, and the upper ends of the valve seats 11 and 12 are fixedly connected with connecting covers 13 and 14 respectively, and the top surface of the connecting cover 13 is fixedly connected with a servo motor. Servo motor 16, the output shaft of servo motor 16 is coaxially connected with the valve shaft, and valve shaft one and valve shaft two 15 are connected in transmission, valve shaft one is fixedly connected with bevel gear one, valve shaft two 15 is fixedly connected with bevel gear two, connecting cover one 13 and connecting cover two 14 are connected in rotation with transmission shaft 17 together, two ends of transmission shaft 17 respectively penetrate into connecting cover one 13 and connecting cover two 14, and two ends of transmission shaft 17 are fixedly connected with bevel gear three, bevel gear three is connected in transmission with bevel gear one and bevel gear two.

[0031] When the utility model is actually applied, once it is necessary to block the low-temperature medium, the servo motor 16 can be driven to rotate the first valve shaft. Once the first valve shaft rotates, the first valve plate 9 and the first bevel gear fixedly connected thereto will also rotate synchronously at the same angular velocity. Since the first bevel gear is in transmission connection with the third bevel gear, the transmission shaft 17 will rotate under the drive of the first bevel gear and the third bevel gear. Then, the other third bevel gear will rotate driven by the transmission shaft 17, and then drive the second bevel gear to rotate. The second bevel gear drives the second valve shaft 15 to rotate, and finally the second valve plate 10 rotates together with the second valve shaft 15, thus completing the synchronous rotation of the first valve plate 9 and the second valve plate 10 and completing the blockage inside the inner valve body 1. When the space between the first valve plate 9 and the second valve plate 10 is closed, the solenoid valve in the first through hole is opened, so that the inside of the inner valve body 1 is communicated with the first cavity 6. Then, the low-temperature medium in the first cavity 6 and the inner valve body 1 is pumped away through the first air pump and the first connecting pipe 5 to reduce the air pressure between the first valve plate 9 and the second valve plate 10 and improve the vacuum degree therebetween. Then, the solenoid valve in the first through hole is closed, and then the solenoid valve in the second through hole is opened, and the helium in the helium gas cylinder is pumped into it, so as to further improve the heat insulation effect between the first valve plate 9 and the second valve plate 10. Finally, the solenoid valve in the second through hole is closed again, so that it is difficult for heat conduction to occur between the first valve plate 9 and the second valve plate 10, avoiding the situation that the temperature difference between the two sides of this butterfly valve changes too much and avoiding the deformation of the inner diameter of the valve body or the inner wall of the pipeline. If it is necessary to reopen the first valve plate 9 and the second valve plate 10, only need to open the solenoid valve in the first through hole, re-pump out the air, then pump in a certain amount of air, and then close the solenoid valve in the first through hole, and then the first valve plate 9 and the second valve plate 10 can be rotated to open the flow channel in the inner valve body 1.

[0032] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A cryogenic butterfly valve, characterized in that: The invention comprises an inner valve body (1) and an outer valve body (4), wherein two spacers (18) are fixedly connected between the inner valve body (1) and the outer valve body (4), and the two spacers (18) separate the inner valve body (1) and the outer valve body (4) to form a cavity one (6) and a cavity two (8); the outer valve body (4) is connected with a connecting pipe one (5) and a connecting pipe two (7) which are connected with the cavity one (6) and the cavity two (8) respectively; the connecting pipe one (5) and the cavity one (6) are used to guide the air to enter and exit, and the connecting pipe two (7) and the cavity two (8) are used to guide the low thermal conductivity gas to enter and exit; the inner valve body (1) is provided with a through hole one and a through hole two which are connected with the cavity one (6) and the cavity two (8) respectively; solenoid valves are arranged in the through hole one and the through hole two, and a valve plate one (9) and a valve plate two (10) which are rotatably connected in the inner valve body (1) to close the two ends thereof.

2. A cryogenic butterfly valve according to claim 1, characterized in that: The low thermal conductivity gas is helium, the connecting pipe one (5) is connected to an air pump one, the connecting pipe two (7) is connected to a helium bottle, and the connecting pipe two (7) is connected to an air pump two.

3. A cryogenic butterfly valve according to claim 1, characterized in that: A plurality of reinforcement strips (3) are also fixedly connected between the outer ring of the inner valve body (1) and the outer valve body (4).

4. A cryogenic butterfly valve according to claim 1, characterized in that: The outer ring of the inner valve body (1) is fixedly connected with valve seat 1 (11) and valve seat 2 (12) which penetrate the outer valve body (4) and communicate with the interior of the inner valve body (1); valve shaft 1 and valve shaft 2 (15) are rotatably connected inside the valve seat 1 (11) and valve seat 2 (12), respectively; the valve shaft 1 and valve shaft 2 (15) are fixedly connected with valve plate 1 (9) and valve plate 2 (10), respectively; the valve plate 1 (9) and valve plate 2 (10) are opened and closed synchronously.

5. A cryogenic butterfly valve according to claim 4, characterized in that: The upper ends of the valve seat 1 (11) and the valve seat 2 (12) are respectively fixedly connected with a connecting cover 1 (13) and a connecting cover 2 (14); the top surface of the connecting cover 1 (13) is fixedly connected with a servo motor (16); the output shaft of the servo motor (16) is coaxially connected to the valve shaft, and the valve shaft 1 and the valve shaft 2 (15) are connected in a transmission manner.

6. A cryogenic butterfly valve according to claim 5, characterized in that: The valve shaft 1 is fixedly connected with a bevel gear 1, the valve shaft 2 (15) is fixedly connected with a bevel gear 2, the connecting cover 1 (13) and the connecting cover 2 (14) are rotatably connected with a transmission shaft (17), the two ends of the transmission shaft (17) respectively penetrate into the connecting cover 1 (13) and the connecting cover 2 (14), and the two ends of the transmission shaft (17) are fixedly connected with a bevel gear 3, and the bevel gear 3 is transmission-connected with the bevel gear 1 and the bevel gear 2.

7. A cryogenic butterfly valve according to claim 1, characterized in that: The inner valve body (1) and the outer valve body (4) are fixedly connected to a flange (2) at both ends.

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