Flow regulating valve of liquid helium infusion tube

Abstract

The utility model discloses a liquid helium infusion tube flow regulating valve which is characterized in that the liquid helium infusion tube flow regulating valve comprises a tube body, a control valve seat and a control valve needle, the tube body comprises a vertical vacuum outer tube and a capillary tube arranged in the vertical vacuum outer tube, the bottom end of the capillary tube is fixedly connected with the control valve seat, an input channel is formed in the control valve seat, and the control valve needle is arranged in the input channel. One end of the input channel is communicated with the capillary tube, the other end of the input channel is connected with an external liquid helium input tube, the outer side of the vertical vacuum outer tube is rotationally connected with a regulating valve vertical tube, and the control valve needle is fixedly connected to the bottom of the regulating valve vertical tube. According to the utility model, the free end of the control valve needle can be screwed in or out of the input channel, and the gap between the free end of the control valve needle and the input channel is reduced or enlarged, so that the flow of the input channel can be adjusted, and the requirements of different testing devices can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid helium infusion tube equipment, and more specifically to a liquid helium infusion tube flow regulating valve. Background Art

[0002] With the development of cryogenic technology, liquid helium has important uses in the fields of low-temperature superconductivity and semiconductor production. Since helium is extremely inactive and difficult to liquefy, the price of liquid helium is relatively expensive. The temperature of liquid helium is -269K, which makes it very easy to vaporize. Therefore, the cost of using liquid helium is particularly high. During the transportation of liquid helium, if it is not recycled in time, the vaporized helium will be directly discharged, which will cause significant economic losses.

[0003] For low-temperature test equipment that uses liquid helium for cooling, after the liquid helium is used up, the vaporized helium still has an extremely low temperature, and the low-temperature helium can continue to be used, thereby maximizing the use of the cooling capacity provided by the liquid helium. If it is not used in time, the vaporized helium will be directly discharged, which will also consume a large amount of cooling capacity, and the cooling capacity of the liquid helium cannot be fully utilized, which is also a waste of energy.

[0004] In addition to the direct delivery of liquid helium, the liquid helium infusion tube must also have the ability to be continuously adjustable. If the infusion tube is simply fixed according to the size of the inner tube and directly delivers liquid helium, it lacks the function of continuous adjustment, which will greatly waste liquid helium resources. According to the needs of the test device, the liquid helium flow rate can be adaptively adjusted to meet the needs of different test devices, which is the real value of the liquid helium infusion tube. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to achieve flow regulation of a liquid helium infusion tube.

[0006] The utility model solves the above technical problems through the following technical means: a liquid helium infusion tube flow regulating valve, characterized in that it comprises a tube body, a control valve seat, and a control valve needle, the tube body comprises a vertical vacuum outer tube and a capillary arranged in the vertical vacuum outer tube, the bottom end of the capillary is fixedly connected to the control valve seat, an input channel is opened on the control valve seat, one end of the input channel is connected to the capillary, and the other end is connected to an external liquid helium input tube, the outer side of the vertical vacuum outer tube is rotatably connected with a regulating valve vertical tube, the control valve needle is fixedly connected to the bottom of the regulating valve vertical tube, and the free end of the control valve needle can be screwed into or out of the input channel to cause the gap between the free end of the control valve needle and the input channel to be reduced or expanded.

[0007] By enabling the free end of the control valve needle to be screwed in or out of the input channel and causing the gap between the free end of the control valve needle and the input channel to be reduced or expanded, the flow rate of the input channel can be adjusted to meet the needs of different test devices.

[0008] As a preferred technical solution, the control valve needle includes a threaded connection part, an intermediate connection part, and a conical part which are fixed in sequence and have decreasing diameters. The bottom of the vertical tube of the regulating valve is fixedly connected to the threaded connection part. The input channel includes a threaded hole, a reducing hole, and a cylindrical hole which are opened in sequence from its bottom. The conical part is adapted to the size of the cylindrical hole, the threaded hole is threadedly matched with the threaded connection part, and the reducing hole is larger in size than the intermediate connection part.

[0009] As a preferred technical solution, a side wall of the control valve seat is provided with a liquid infusion hole connected to the input channel, and a plurality of through holes are provided on the vertical pipe of the regulating valve.

[0010] As a preferred technical solution, an adjusting hand wheel is fixedly connected to the top of the vertical pipe of the regulating valve, and a dial is marked on the adjusting hand wheel.

[0011] As a preferred technical solution, the variable diameter hole is a tapered hole, and the tapered hole includes a first aperture and a second aperture, and the first aperture and the second aperture are respectively the same as the aperture of the threaded hole and the aperture of the cylindrical hole.

[0012] As a preferred technical solution, the adjusting hand wheel and the vertical vacuum outer tube are rotary sealed, a rectangular groove is opened on the inner side of the adjusting hand wheel, and a rubber ring is installed in the rectangular groove.

[0013] As a preferred technical solution, the cylindrical hole is a straight-through circular hole, the conical portion is a conical pin, and the top end thereof is a conical setting.

[0014] As a preferred technical solution, the infusion hole is located in the middle of the variable diameter hole.

[0015] As a preferred technical solution, the capillary tube is fixedly connected to the control valve seat through a vertical vacuum outer tube filler.

[0016] As a preferred technical solution, a gap is left between the outer wall of the control valve seat and the inner wall of the vertical pipe of the regulating valve.

[0017] The advantages of the utility model are:

[0018] (1) In the present invention, the flow rate of the input channel can be adjusted by enabling the free end of the control valve needle to be screwed into or out of the input channel and causing the gap between the free end of the control valve needle and the input channel to be reduced or expanded, thereby meeting the needs of different test devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a cross-sectional structure provided for an embodiment of the utility model;

[0020] Figure 2The embodiment of the utility model provides Figure 1 B is a schematic diagram of a local enlarged structure;

[0021] Figure numbers: 3, capillary; 5, capillary insulation support; 26, vertical vacuum outer tube; 27, rubber ring; 28, adjusting hand wheel; 29, regulating valve vertical tube; 30, vertical vacuum outer tube bushing; 311, control valve seat; 3111, threaded hole; 3112, reducing hole; 3113, cylindrical hole; 312, control valve needle; 3121, threaded connection; 3122, intermediate connection; 3123, conical part; 37, infusion hole; 38, through hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 A liquid helium infusion pipe flow regulating valve comprises a pipe body, a control valve seat 311 and a control valve needle 312. The pipe body comprises a vertical vacuum outer pipe 26 and a capillary 3 arranged in the vertical vacuum outer pipe 26. The bottom end of the capillary 3 is fixedly connected to the control valve seat 311. An input channel is provided on the control valve seat 311. One end of the input channel is connected to the capillary 3 and the other end is connected to an external liquid helium input pipe. A regulating valve vertical pipe 29 is rotatably connected to the outer side of the vertical vacuum outer pipe 26. The control valve needle 312 is fixedly connected to the outer side of the vertical vacuum outer pipe 26. It is fixedly connected to the bottom of the regulating valve vertical tube 29, and the free end of the control valve needle 312 can be screwed into or out of the input channel to cause the gap between the free end of the control valve needle 312 and the input channel to shrink or expand. In this embodiment, the capillary 3 is a liquid helium infusion tube, and the space between the capillary 3 and the vertical vacuum outer tube 26 can be a vacuum environment to reduce heat leakage of the capillary 3. One end of the vertical vacuum outer tube 26 is connected to the vacuum outer tube elbow at the top, and the other end is fixed to the control valve seat 311 to form a closed space.

[0024] See also Figure 1 and Figure 2The control valve seat 311 is made of hard alloy, the control valve needle 312 is made of stainless steel, the capillary 3 is connected to the control valve seat 311, the vertical vacuum outer tube 26 is fixedly connected to the control valve seat 311 through the vertical vacuum outer tube bushing 30, the outer side of the vertical vacuum outer tube 26 is rotatably connected with the regulating valve vertical tube 29, the control valve seat 311 is provided with an input channel connected to the capillary 3, the bottom of the regulating valve vertical tube 29 is fixedly connected to one end of the control valve needle 312, the other end of the control valve needle 312 can be extended into or out of the input channel, and the control valve needle 312 includes a plurality of fixed The threaded connection part 3121, the middle connection part 3122 and the conical part 3123 are connected and the pipe diameter decreases gradually. The middle connection part 3122 is cylindrical. The bottom of the vertical pipe 29 of the regulating valve is fixedly connected with the threaded connection part 3121. The input channel includes a threaded hole 3111, a diameter-reducing hole 3112 and a cylindrical hole 3113 which are opened in sequence. The conical part 3123 is adapted to the size of the cylindrical hole 3113. The cylindrical hole 3113 is a straight-through circular hole. The conical part 3123 is a conical pin, and its top end is a hemispherical setting. The threaded hole 3111 is threadedly matched with the threaded connection part 3121.

[0025] The variable diameter hole 3112 has two apertures, namely a first aperture and a second aperture, wherein the first aperture is the same as the aperture of the threaded hole 3111, and the second aperture is the same as the aperture of the cylindrical hole 3113, and the first aperture is larger than the second aperture. To ensure the delivery of liquid helium in the variable diameter hole 3112, the size of the variable diameter hole 3112 is larger than the size of the middle connecting portion 3122, and a liquid infusion hole 37 connected to the input channel is provided on the side wall of the control valve seat 311, and the liquid infusion hole 37 is located in the middle of the variable diameter hole 3112, and a plurality of through holes 38 are provided on the regulating valve vertical pipe 29 to ensure that the external liquid helium pipe can pass through the regulating valve vertical pipe 29 and connect with the liquid infusion hole 37, and enter the variable diameter hole 3112 and the cylindrical hole 31 13 thus enters into the capillary 3, the infusion hole 37 is located in the middle of the middle connecting part 3122, an adjusting hand wheel 28 is welded and fixed on the top of the regulating valve vertical tube 29, and a scale is marked on the adjusting hand wheel 28, and the scale value is distributed from 0° to 360°, which can be convenient for observing the adjustment opening of the low-temperature flow regulating valve, and the adjusting hand wheel 28 and the vertical vacuum outer tube 26 are rotary seals, specifically, a rectangular groove is processed on the inner side of the adjusting hand wheel 28 for installing a rubber ring 27, and the vertical vacuum outer tube 26 and the regulating valve vertical tube 29 are side-sealed by the rubber ring 27 to prevent helium from escaping upward and causing losses, and a gap is left between the outer wall of the control valve seat 311 and the inner wall of the regulating valve vertical tube 29.

[0026] See also Figure 1A capillary insulation support 5 is also provided between the capillary 3 and the vertical vacuum outer tube 26 to separate the capillary 3 and the vertical vacuum outer tube 26 to reduce heat conduction and convection heat transfer. The capillary insulation support 5 is generally circular, and is circumferentially provided with at least three protrusions (circular structures of point contact) and is in point contact with the vertical vacuum outer tube 26. A support hole adapted to the capillary 3 is provided inside the capillary insulation support 5. The capillary insulation support 5 is hollowed out, that is, a plurality of waist holes are provided to extend the heat conduction path.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid helium infusion pipe flow regulating valve, characterized in that: The utility model comprises a tube body, a control valve seat and a control valve needle. The tube body comprises a vertical vacuum outer tube and a capillary tube arranged in the vertical vacuum outer tube. The bottom end of the capillary tube is fixedly connected to the control valve seat. An input channel is provided on the control valve seat. One end of the input channel is connected to the capillary tube, and the other end is connected to an external liquid helium input tube. A regulating valve vertical tube is rotatably connected to the outer side of the vertical vacuum outer tube. The control valve needle is fixedly connected to the bottom of the regulating valve vertical tube. The free end of the control valve needle can be screwed into or out of the input channel to reduce or expand the gap between the free end of the control valve needle and the input channel.

2. A liquid helium infusion pipe flow control valve according to claim 1, characterized in that: The control valve needle includes a threaded connection part, an intermediate connection part, and a conical part which are fixed in sequence and have decreasing tube diameters. The bottom of the vertical tube of the regulating valve is fixedly connected to the threaded connection part. The input channel includes a threaded hole, a reducing hole, and a cylindrical hole which are opened in sequence from the bottom thereof. The conical part is adapted to the size of the cylindrical hole, the threaded hole is threadedly matched with the threaded connection part, and the reducing hole is larger in size than the intermediate connection part.

3. A liquid helium infusion pipe flow regulating valve according to claim 2, characterized in that: The side wall of the control valve seat is provided with a liquid infusion hole connected with the input channel, and the vertical pipe of the regulating valve is provided with a plurality of through holes.

4. A liquid helium infusion pipe flow regulating valve according to claim 1, characterized in that: The top of the vertical pipe of the regulating valve is fixedly connected with an adjusting hand wheel, and the adjusting hand wheel is marked with a dial.

5. The liquid helium infusion pipe flow regulating valve according to claim 2, characterized in that: The variable diameter hole is a tapered hole, and the tapered hole includes a first aperture and a second aperture, and the first aperture and the second aperture are respectively the same as the aperture of the threaded hole and the aperture of the cylindrical hole.

6. A liquid helium infusion pipe flow regulating valve according to claim 4, characterized in that: The regulating hand wheel and the vertical vacuum outer tube are in a rotary seal, a rectangular groove is provided on the inner side of the regulating hand wheel, and a rubber ring is installed in the rectangular groove.

7. A liquid helium infusion pipe flow regulating valve according to claim 2, characterized in that: The cylindrical hole is a straight through circular hole, the conical portion is a conical pin, and the top end thereof is a conical setting.

8. The liquid helium infusion pipe flow regulating valve according to claim 3, characterized in that: The infusion hole is located in the middle of the variable diameter hole.

9. The liquid helium infusion pipe flow regulating valve according to claim 1, characterized in that: The capillary tube is fixedly connected to the control valve seat through a vertical vacuum outer tube filler.

10. The liquid helium infusion pipe flow regulating valve according to claim 2, characterized in that: A gap is left between the outer wall of the control valve seat and the inner wall of the vertical pipe of the regulating valve.

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