Controllable efficient low-temperature transmission pipeline

Abstract

The utility model discloses a controllable high-efficiency low-temperature transmission pipeline, which relates to the technical field of ultralow-temperature transmission equipment and comprises a first pipe leg, a flexible section, a switching body, a second pipe leg, a transmission conduit and an elbow, the first pipe leg, the flexible section and the switching body are sequentially connected through the elbow, the second pipe leg is connected with the switching body, and the transmission conduit is connected with the flexible section. The transfer body is provided with a valve, a vacuum port, a safety valve and a needle valve, and the transmission conduit is located at the central axis of the pipeline and penetrates through the whole pipeline end to end. Through the needle valve capable of controlling the flow, the adsorbent capable of improving the vacuum degree, the small hole inlet for filtering ice slag and the heat radiation prevention layer structure for reducing heat leakage, the low-temperature pipeline is controllable in refrigerant transmission, higher in efficiency, longer in maintenance-free interval and better in heat insulation performance. In addition, a large-flux low-temperature transmission pipeline can be obtained by increasing the diameter of the transmission guide pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-low temperature transmission equipment, in particular to a controllable and efficient low-temperature transmission pipeline. Background Technique

[0002] In the field of cryophysics, traditional cryogenic equipment relies on refrigerants for cooling. However, such cryogenic equipment can basically not store refrigerants or has a very limited storage capacity and needs to be replenished frequently. The transmission pipeline is basically an integral part of all cryogenic systems, and its function is to transmit cryogenic refrigerants between two cryogenic systems.

[0003] As is well known, liquid helium and liquid nitrogen are very important and efficient refrigerants, and have been directly used as cold sources to provide a low-temperature environment for cryogenic systems for many years; liquid nitrogen is easy to obtain, can be directly separated from the air, and has relatively low requirements for its operation and transmission. Different from liquid helium, since it is a non-renewable resource and the liquid helium resources in our country are scarce, the price has been rising year by year, so the requirements for its use operation and transmission are more stringent.

[0004] Therefore, it is extremely important to develop an efficient and adjustable low-temperature transmission pipeline for transmitting refrigerants. Summary of the Invention

[0005] The purpose of the utility model is to provide a controllable and efficient low-temperature transmission pipeline aiming at the deficiencies existing in the prior art.

[0006] A controllable and efficient low-temperature transmission pipeline includes a first leg, a flexible section, an adapter, a second leg and a transmission conduit. The first leg, the flexible section and the second leg are connected in sequence. The adapter is arranged between the second leg and the flexible section. The transmission conduit penetrates through the first leg, the flexible section and the second leg in sequence. The second leg includes an inner tube and an outer tube, and the outer tube and the inner tube are arranged from outside to inside in sequence. The first leg, the flexible section, the adapter and the inner tube are interconnected to form a closed cavity. The closed cavity is a co-vacuum environment. The transmission conduit penetrates through the entire closed cavity. One side of the outer tube away from the adapter is the inlet. A needle valve is further arranged on the second leg. The needle valve includes a needle valve knob, a valve body and a needle tip. The bottom of the needle tip is connected to the needle valve knob through the outer tube. The valve body is arranged inside the outer tube and connected to the inner tube. The valve body is communicated with the transmission conduit inside the inner tube. The needle tip is embedded into the valve body inward. Small holes are arranged on the valve body. The inlet is communicated with the small holes on the valve body. When the needle valve knob is rotated, the needle tip is driven to move in the valve body through the outer tube to adjust the gap between the needle tip and the valve body.

[0007] Further, at least one liquid inlet hole is arranged at the inlet of the outer tube.

[0008] Further, an internal thread is provided on the inner side wall of the valve body, and an external thread is provided on the outer side wall of the needle tip. The external thread on the needle tip fits with the internal thread on the valve body.

[0009] Further, a wedge-shaped groove is provided on one side of the valve body close to the needle tip, and a wedge-shaped block is provided on the needle tip. The wedge-shaped block fits with the wedge-shaped groove.

[0010] Further, the flexible section includes a first corrugated pipe and a second corrugated pipe, and the first corrugated pipe, the second corrugated pipe and the transmission conduit are arranged in sequence from inside to outside.

[0011] Further, the wave pitch of the first corrugated pipe is greater than that of the second corrugated pipe.

[0012] Further, a valve, a vacuum port and a safety valve are provided on the adapter body. The vacuum port is docked with an external pump set, and the external pump set evacuates the closed cavity. The valve controls the on-off between the closed cavity and the external pump set, and the safety valve is communicated with the closed cavity.

[0013] Further, an adsorbent is filled inside the inner pipe.

[0014] Further, a heat radiation protection layer is provided on the outer ring of the transmission conduit.

[0015] Further, an elbow is further included. Two elbows are provided, and the two elbows are respectively arranged at the connection parts between the first leg, the flexible section and the second leg.

[0016] The advantages of the present utility model compared with the prior art are as follows:

[0017] In this solution, through the built-in needle valve design, the flow rate during the refrigerant transmission process can be adjusted and controlled, so that the refrigerant is used efficiently; the filled adsorbent helps to improve the internal vacuum environment of the pipeline, extend the maintenance-free time and reduce the maintenance cost; when the second leg at room temperature environment first enters the refrigerant, due to the temperature difference, there are ice dregs nearby, and the liquid inlet holes on it can effectively filter it to prevent pipeline blockage; the heat radiation protection layer design makes the overall outgassing rate of the pipeline lower, with the characteristic of low heat leakage, so that the transmission efficiency of the refrigerant is higher. In addition, a large-flux transmission pipeline can be obtained by increasing the diameter of the transmission conduit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the controllable high-efficiency low-temperature transmission pipeline;

[0019] Figure 2 is the structural schematic diagram of the second leg in the controllable high-efficiency low-temperature transmission pipeline;

[0020] Figure 3 is the structural schematic diagram of the adapter body in the controllable high-efficiency low-temperature transmission pipeline.

[0021] Reference numerals: 1, first leg; 2, flexible section; 201, first corrugated pipe; 202, second corrugated pipe; 3, adapter; 4, second leg; 401, outer pipe; 402, inner pipe; 403, liquid inlet hole; 5, transfer conduit; 6, elbow; 7, valve; 8, vacuum port; 9, safety valve; 10a, needle valve knob; 10b, valve body; 10c, needle tip; 11, adsorbent; 12, heat radiation protection layer. Detailed implementation mode

[0022] Combined with the attached Figures 1-3 As shown, a controllable high-efficiency low-temperature transmission pipeline includes a first leg 1, a flexible section 2, an adapter 3, a second leg 4, a transfer conduit 5, and an elbow 6. Among them, the first leg 1, the flexible section 2, and the adapter 3 are sequentially connected through the elbow 6; the second leg 4 is connected to the adapter 3; the transfer conduit 5 runs through the entire pipeline and is located at the central position, and the refrigerant flows inside; a valve 7, a vacuum port 8, and a safety valve 9 are provided on the adapter 3;

[0023] The end of the first leg 1 is connected to the experimental end; the inside of the first leg 1 is in a vacuum environment, and the transfer conduit 5 is located at the center of the first leg 1; the refrigerant flows into the experimental equipment through the transfer conduit 5 inside the first leg 1.

[0024] The flexible section 2 includes a first corrugated pipe 201 and a second corrugated pipe 202; the first corrugated pipe 201, the second corrugated pipe 202, and the transfer conduit 5 are arranged in sequence from inside to outside; the flexible section 2 is generally made of stainless steel, and the wave pitch of the first corrugated pipe 201 is greater than that of the second corrugated pipe 202; the first corrugated pipe 201 has the function of supporting and protecting the second corrugated pipe 202 and the transfer conduit 5, and the second corrugated pipe 202 provides a vacuum environment for the transfer conduit 5;

[0025] One end of the second leg 4 is connected to a Dewar for storing refrigerant externally. The second leg 4 is composed of an inner pipe 402 and an outer pipe 401; the outer pipe 401, the inner pipe 402, and the transfer conduit 5 are arranged in sequence from outside to inside;

[0026] An inlet is provided on the side of the outer pipe 401 away from the adapter 3. The inlet serves as a channel for the refrigerant to enter the transfer conduit 5. In addition, when the room-temperature pipeline is immersed in the refrigerant Dewar, due to the large temperature difference, the refrigerant near the second leg 4 generally freezes. If the ice slag directly enters the pipeline, it will cause blockage of the inlet. Therefore, a number of liquid inlet holes are provided at the inlet part. By setting the liquid inlet holes, the ice slag can be effectively filtered to prevent the pipeline from being blocked;

[0027] The first leg 1, the second corrugated pipe 202, the adapter 3, and the inner pipe 402 are interconnected to form a closed cavity, which is a common vacuum environment, and the transfer conduit 5 runs through the entire closed cavity.

[0028] The adapter 3 is provided with a valve 7, a vacuum port 8, and a safety valve 9. Among them, the vacuum port 8 evacuates the above-mentioned closed cavity through an external pump set; the valve 7 can control the connection and disconnection between the closed cavity and the external pump set, so as to realize the evacuation operation of the pipeline by using the valve 7 and the vacuum port 8; the safety valve 9 is connected to the closed cavity to monitor its internal pressure. When the pressure exceeds its critical value, it pops out to release the internal pressure of the pipeline in time, ensuring the safety of the experimental equipment and personnel.

[0029] The needle valve consists of a needle valve knob 10a, a valve body 10b, and a needle tip 10c; the bottom of the needle tip 10c is connected to the needle valve knob 10a through an outer tube 401; the needle tip 10c fits inwardly with the valve body 10b, and the fitting methods include but are not limited to threaded connection, wedge contact, etc., which are design methods that can achieve tight fitting; the valve body 10b is provided with a small hole, one end of the valve body 10b is connected to the inlet (liquid inlet hole 403), and one end is connected to the transmission conduit 5; when the needle valve knob 10a is rotated, the needle tip 10c is driven to move left and right through the outer tube 401, so as to adjust the flow rate of the refrigerant entering the needle tip 10c, thereby controlling the flow rate of the refrigerant in the pipeline.

[0030] Due to the existence of a vacuum environment in the pipeline, in addition to regularly evacuating to maintain the vacuum degree, an adsorbent 11 is filled inside the inner tube 402 to adsorb impurity gases, so as to improve the vacuum environment of the pipeline and extend the interval of the maintenance-free period.

[0031] The transmission conduit 5 transmits the refrigerant. In order to further reduce the loss caused by heat radiation to the refrigerant transmission, a heat radiation prevention layer 12 can be provided around it. The transmission conduit 5 is preferably a capillary tube made of stainless steel. When a large flux of refrigerant needs to be transmitted, the diameter of the capillary tube can be increased.

[0032] The elbow 6 is made of stainless steel, and the bend angle is generally 90 degrees and flat angle. The low-temperature transmission pipeline generally has several forms, such as one end elbow 6, both ends elbow 6, and straight pipe, and the angle can also be adjusted according to the actual situation.

[0033] When using the low-temperature transmission pipeline to transmit the refrigerant, first evacuate the pipeline, connect the external pump set to the vacuum port 8, start the vacuum pump and open the valve 7 to evacuate the closed cavity in the pipeline. After the vacuum degree reaches 10* -5 mbar, close the valve 7 and disconnect the vacuum port 8 and the pump set; secondly, connect the experimental device, connect the first leg 1 to the equipment end, and slowly insert the second leg 4 into the refrigerant storage dewar; finally, according to the needs of the experimental device, gradually adjust the needle valve knob 10a to control the flow rate of the refrigerant entering the experimental device by changing the flow rate of the refrigerant entering the needle valve.

[0034] In particular, in addition to being able to transmit liquid helium, the low-temperature transmission pipeline is also compatible with liquid nitrogen.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the description of the present utility model, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0038] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A controllable high-efficiency low-temperature transmission pipeline, characterized in that: The invention comprises a first tube leg (1), a flexible section (2), a connecting body (3), a second tube leg (4) and a transmission conduit (5), wherein the first tube leg (1), the flexible section (2) and the second tube leg (4) are connected in sequence, the connecting body (3) is arranged between the second tube leg (4) and the flexible section (2), the transmission conduit (5) passes through the first tube leg (1), the flexible section (2) and the second tube leg (4) in sequence, the second tube leg (4) comprises an inner tube (402) and an outer tube (401), the outer tube (401) and the inner tube (402) are arranged in sequence from the outside to the inside, the first tube leg (1), the flexible section (2), the connecting body (3) and the inner tube (402) are connected to each other to form a closed cavity, the closed cavity is a common vacuum environment, the transmission conduit (5) passes through the entire closed cavity, and the outer tube (401) is far away from the connecting body (3). One side of the second tube leg (4) is an inlet, and a needle valve is further provided on the second tube leg (4), the needle valve comprising a needle valve knob (10a), a valve body (10b) and a needle tip (10c); the bottom of the needle tip (10c) is connected to the needle valve knob (10a) via an outer tube (401); the valve body (10b) is arranged in the outer tube (401) and connected to the inner tube (402), the valve body (10b) is communicated with the transmission conduit (5) in the inner tube (402), the needle tip (10c) is inwardly engaged with the valve body (10b), a small hole is provided on the valve body (10b), the inlet is communicated with the small hole on the valve body (10b), and when the needle valve knob (10a) is rotated, the needle tip (10c) is driven to move in the valve body (10b) via the outer tube (401), thereby adjusting the gap between the needle tip (10c) and the valve body (10b).

2. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: At least one liquid inlet hole (403) is provided at the inlet of the outer tube (401).

3. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: The inner wall of the valve body (10b) is provided with an internal thread, and the outer wall of the needle tip (10c) is provided with an external thread, and the external thread on the needle tip (10c) fits with the internal thread on the valve body (10b).

4. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: A wedge-shaped groove is provided on one side of the valve body (10b) close to the needle tip (10c), and a wedge-shaped block is provided on the needle tip (10c), and the wedge-shaped block and the wedge-shaped groove fit together.

5. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: The flexible section (2) comprises a first bellows (201) and a second bellows (202), wherein the first bellows (201), the second bellows (202) and the transmission conduit (5) are arranged in sequence from the inside to the outside.

6. The controllable high-efficiency low-temperature transmission pipeline according to claim 5, characterized in that: The wave pitch of the first bellows (201) is greater than the wave pitch of the second bellows (202).

7. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: The adapter body (3) is provided with a valve (7), a vacuum port (8), and a safety valve (9); the vacuum port (8) is connected to an external pump group, the external pump group evacuates the closed cavity, the valve (7) controls the connection and disconnection of the closed cavity and the external pump group, and the safety valve (9) is connected to the closed cavity.

8. The controllable high-efficiency low-temperature transmission pipeline according to claim 1 is characterized in that: The inner tube (402) is filled with an adsorbent (11).

9. The controllable high-efficiency low-temperature transmission pipeline according to claim 1, characterized in that: The outer ring of the transmission conduit (5) is provided with a heat radiation protection layer (12).

10. The controllable high-efficiency low-temperature transmission pipeline according to claim 1, characterized in that: It also comprises an elbow (6), wherein two elbows (6) are provided, and the two elbows (6) are respectively provided at the connection portion between the first tube leg (1), the flexible section (2) and the adapter (3).

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