Ultra-low temperature cold trap device

Abstract

The present invention relates to the technical field of ultra-low temperature cold traps, and in particular to an ultra-low temperature cold trap device. It comprises: a shell; a liquid storage tank, mounted on the shell; a rotating frame, rotatably connected to the shell, the rotating frame being provided with a plurality of first chambers; a baffle, fixedly connected to the shell, a collecting chamber being provided between the baffle and the shell, and the shell being provided with an external drain pipe. The present invention reduces the liquid content in the first chamber through which the airflow passes by continuously replacing the first chamber connected to the air inlet pipe, thereby ensuring the stability of the liquid separation in the airflow, so as to reduce the influence of the liquid in the gas on the vacuum pump, and discharge the liquid in the collecting chamber through the external drain pipe. Without disassembling the device, the liquid in the device is simply removed to reduce the disassembly and assembly frequency of the device, thereby reducing the probability of sealing failure of the device due to frequent disassembly and assembly, and extending the service life of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-low temperature cold traps, and particularly to an ultra-low temperature cold trap device. Background Art

[0002] An ultra-low temperature cold trap device is a device used to trap and remove condensable liquids in a gas. Usually, the temperature is lowered to an extremely low level by liquid nitrogen, so that the condensable liquids contained in the gas passing through the cold trap will condense, in order to remove the condensable liquids in the gas. The removed condensable liquids will condense inside the cold trap. After the cold trap is used up, it is necessary to disassemble the cold trap to remove the condensable liquids inside the cold trap. However, during the single use of the cold trap, along with the use of the cold trap, the content of condensable liquids inside the cold trap will continuously increase, which will lead to an increasing amount of condensable liquids in contact with the gas, resulting in a linear decrease in the efficiency of separating condensable liquids in the gas during the single use of the cold trap. And after the cold trap is used up, it is also necessary to disassemble and assemble the cold trap to remove the condensable liquids in the cold trap, which will lead to frequent disassembly and assembly of the cold trap, thus causing the cold trap to have a sealing failure due to frequent disassembly and assembly, affecting the service life of the cold trap. Summary of the Invention

[0003] In order to overcome the disadvantages mentioned in the above background, the present invention provides an ultra-low temperature cold trap device.

[0004] Technical Solution: An ultra-low temperature cold trap device includes:

[0005] A housing, the housing is connected to an intake pipe and an exhaust pipe, and a temperature equalizing plate is fixedly connected to the housing;

[0006] A liquid storage tank, which is hermetically installed in the housing, and a temperature equalizing part is arranged at a position of the liquid storage tank close to the intake pipe;

[0007] A rotating frame, which is hermetically and rotatably connected to the housing and is located between the housing and the liquid storage tank. A power member for driving the rotating frame to rotate is arranged on the housing. The rotating frame is provided with a plurality of first chambers distributed circumferentially, and the first chambers are used to connect the intake pipe and the exhaust pipe;

[0008] Baffles, there are two baffles with central symmetry distribution, both are fixedly connected inside the housing and are respectively located on the upper and lower sides of the rotating frame. A collection chamber is arranged between the lower baffle and the housing, and the housing is provided with an external drain pipe communicating with the collection chamber.

[0009] Preferably, the intake pipe and the exhaust pipe are respectively located on both sides of the housing. The baffle is provided with a notch. The notch of the upper baffle faces the intake pipe, and the notch of the lower baffle faces the exhaust pipe. The baffle is used to block the first chamber. The notch of the upper baffle is used to communicate the first chamber with the inside of the housing, and the notch of the lower baffle is used to communicate the first chamber with the collection chamber.

[0010] Preferably, it further includes:

[0011] The flow guide plates, which are provided with several groups distributed circumferentially, and the number of groups is the same as the number of the first chambers. They are all fixedly connected to the rotating frame. The flow guide plates of the same group are vertically spaced and distributed in adjacent first chambers. The area of the projection of the flow guide plate in the direction of the collection chamber is smaller than the area of the projection of the first chamber in the direction of the collection chamber. The flow guide plates are used to guide the airflow.

[0012] Preferably, the flow guide plates are inclined, and the inclination directions of two adjacent flow guide plates in the same group are opposite.

[0013] Preferably, the horizontal cross-section of the heat pipe is arc-shaped, the horizontal cross-section of the first chamber is arc-shaped, the heat pipe is located at a position on the housing close to the exhaust pipe, and the radian of the heat pipe is smaller than the radian of the first chamber.

[0014] Preferably, the obtuse angle formed by the two sides of the projection of the baffle in the direction of the collection chamber from the axis of the housing is X, and the acute angle formed by the two sides of the projection of the first chamber in the direction of the collection chamber from the axis of the housing is Y, and X = 360° - Y.

[0015] Preferably, it further includes:

[0016] The flexible heat insulation parts, the number of which is the same as the number of the first chambers. They are all arranged at positions on the rotating frame close to the liquid storage tank. The flexible heat insulation parts are used to scrape off the ice and frost condensed on the surfaces of the liquid storage tank and the heat equalizing part.

[0017] Preferably, it further includes:

[0018] The connecting cylinder is fixedly connected inside the liquid storage tank. A second chamber is provided between the connecting cylinder and the liquid storage tank. The liquid storage tank is fixedly connected with a pressure discharge pipe communicating with the second chamber;

[0019] The piston is slidably and rotatably connected inside the connecting cylinder. The piston is fixedly connected with a limit pin. A guide groove is arranged inside the connecting cylinder, and the limit pin slides in the guide groove.

[0020] Preferably, it further includes:

[0021] The detecting member is slidably connected to the liquid storage tank. The detecting member is composed of a sliding rod and a sealing block. There is a gap at the sliding part between the sliding rod of the detecting member and the liquid storage tank. The connecting cylinder divides the second chamber into two parts, and the sealing block of the detecting member seals and slides within one part of the second chamber.

[0022] Preferably, the height of the second chamber is greater than the height of the rotating frame, and the height of the detecting member is less than the height of the second chamber.

[0023] Compared with the prior art, the present invention has the following advantages: 1. By continuously replacing the first chamber communicated with the intake pipe, the liquid content in the first chamber passed by the air flow is reduced, thereby ensuring the stability of liquid separation in the air flow, reducing the influence of the liquid in the gas on the vacuum pump, and discharging the liquid in the collection chamber through an external drain pipe. Without disassembling the device, the liquid in the device can be simply removed, reducing the disassembly and assembly frequency of the device, thereby reducing the probability of seal failure due to frequent disassembly and assembly of the device, and prolonging the service life of the device;

[0024] 2. The flexible heat insulation part scrapes the frost condensed on the surface of the liquid storage tank, reducing the amount of frost attached to the liquid storage tank and the temperature equalizing part, ensuring the heat exchange efficiency of the temperature equalizing part, and causing the frost to be scraped onto the flow guiding plate to ensure that the melted frost is collected into the collection chamber, reducing the influence of the melted frost on the liquid content in the outer shell, and thus ensuring the dryness in the outer shell;

[0025] 3. By rotating the piston to move it downward, the lower part of the detecting member is always controlled in the upper part of the second chamber, so that the second chamber is always filled with liquid nitrogen, preventing the heat exchange efficiency on the upper side of the temperature equalizing part from decreasing after the liquid nitrogen volatilizes during use, thereby ensuring the stability of the heat exchange efficiency of the temperature equalizing part and improving the stability of the device during use. Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a three-dimensional structural sectional view of the outer shell of the present invention;

[0028] Figure 3 is a three-dimensional structural schematic diagram of the flow guiding plate of the present invention;

[0029] Figure 4 is a three-dimensional structural sectional view of the rotating frame of the present invention;

[0030] Figure 5 is a three-dimensional structural schematic diagram of the baffle of the present invention;

[0031] Figure 6Schematic three-dimensional structure diagram of the flexible heat insulation part of the present invention;

[0032] Figure 7 Schematic three-dimensional structure diagram of the piston of the present invention;

[0033] Figure 8 Schematic three-dimensional structure diagram of the limit pin and the guide groove of the present invention.

[0034] Names and serial numbers of components in the figure: 1. Outer shell, 101. Inlet pipe, 102. Exhaust pipe, 103. Isothermal plate, 2. Liquid storage tank, 201. Isothermal part, 3. Rotating frame, 301. Power component, 302. First chamber, 4. Baffle, 401. Collection chamber, 5. Deflector, 6. Flexible heat insulation part, 7. Connecting cylinder, 701. Second chamber, 702. Pressure discharge pipe, 8. Piston, 801. Limit pin, 802. Guide groove, 9. Detection component. Detailed implementation manners

[0035] First, it should be pointed out that in different described embodiments, the same components are provided with the same reference numerals or the same component names. Among them, the disclosed content included in the entire specification can be meaningfully applied to the same components with the same reference numerals or the same component names. The position descriptions selected in the specification, such as up, down, lateral, etc., also refer to the directly described and illustrated drawings and are meaningfully applied to the new positions when the positions change.

[0036] A cryogenic cold trap device, as Figures 1 - 5As shown in the figure, it includes: a housing 1, the housing 1 is connected to an intake pipe 101 and an exhaust pipe 102. The intake pipe 101 is used to connect to a vacuum chamber, and the exhaust pipe 102 is used to connect to a vacuum pump. The vacuum chamber and the vacuum pump are not shown in the figure. The housing 1 is fixedly connected with a heat dissipation plate 103. The housing 1 is made of heat-insulating material. The heat dissipation plate 103 is used for heat exchange between the external environment and the first chamber 302; a liquid storage tank 2, which is hermetically installed on the housing 1. A heat dissipation part 201 is arranged at a position of the liquid storage tank 2 close to the intake pipe 101. The liquid storage tank 2 is made of heat-insulating material. The heat dissipation part 201 is used for heat exchange between the liquid nitrogen in the liquid storage tank 2 and the first chamber 302; a rotating frame 3, which is hermetically and rotatably connected to the housing 1 and is located between the housing 1 and the liquid storage tank 2. The rotating frame 3 is made of heat-insulating material. The rotating frame 3 is provided with holes distributed circumferentially. The number of these holes is the same as the number of the first chambers 302. The holes of the rotating frame 3 are used to conduct the temperature of the heat dissipation plate 103 into the corresponding first chamber 302. A power member 301 for driving the rotating frame 3 to rotate is arranged on the housing 1. The power member 301 is composed of a toothed ring part arranged on the rotating frame 3, a motor fixedly connected to the housing 1, and a gear. The output shaft of the motor on the housing 1 is fixedly connected with the gear. The gear on the housing 1 meshes with the toothed ring part of the rotating frame 3. The housing 1 is provided with a control terminal not shown in the figure. The motor of the power member 301 is electrically connected to the control terminal. The rotating frame 3 is provided with a number of first chambers 302 distributed circumferentially. The first chambers 302 are used to connect the intake pipe 101 and the exhaust pipe 102; baffles 4, there are two symmetrically distributed about the center, both are fixedly connected inside the housing 1 and are respectively located on the upper and lower sides of the rotating frame 3. The baffles 4 are made of heat-insulating material. A collection chamber 401 is arranged between the lower baffle 4 and the housing 1. An external drainage pipe communicating with the collection chamber 401 is arranged on the lower side of the housing 1 for collecting the liquid in the collection chamber 401. The horizontal section of the heat dissipation plate 103 is arc-shaped, and the horizontal section of the first chamber 302 is arc-shaped. The heat dissipation plate 103 is located on the housing 1 near the exhaust pipe 102. The radian of the heat dissipation plate 103 is smaller than the radian of the first chamber 302, so that when the heat dissipation plate 103 conducts the temperature into one first chamber 302, the heat dissipation plate 103 does not affect other adjacent first chambers 302.

[0037] As Figure 3 with Figure 5As shown, the intake pipe 101 and the exhaust pipe 102 are respectively located on the left and right sides of the outer shell 1. The baffle 4 is provided with a notch. The notch of the upper baffle 4 faces the intake pipe 101, and the notch of the lower baffle 4 faces the exhaust pipe 102. The baffle 4 is used to block the first chamber 302. The upper baffle 4 is used to block the upper side of the first chamber 302 that is not communicated with the intake pipe 101, and the lower baffle 4 is used to block the lower side of the first chamber 302 that is not communicated with the collection chamber 401. The notch of the upper baffle 4 is used to communicate the first chamber 302 on the right side with the inside of the outer shell 1, and the notch of the lower baffle 4 is used to communicate the first chamber 302 on the left side with the collection chamber 401. The obtuse angle formed by the two sides projected from the axis of the outer shell 1 to the baffle 4 in the direction of the collection chamber 401 is X, and the acute angle formed by the two sides projected from the axis of the outer shell 1 to the first chamber 302 in the direction of the collection chamber 401 is Y.

[0038] X = 360° - Y. When the rotating frame 3 does not rotate, the notch of the baffle 4 is separately communicated with one first chamber 302.

[0039] As Figure 3 、 Figure 5 and Figure 6 shown, it further includes: a deflector 5, which has several groups distributed circumferentially, and the number of groups is the same as the number of the first chambers 302. All are fixedly connected to the rotating frame 3. The deflectors 5 in the same group are distributed at intervals up and down in the adjacent first chambers 302. Through several deflectors 5 distributed up and down, the time for the air flow to flow upward is extended. The area of the deflector 5 projected in the direction of the collection chamber 401 is smaller than the area of the first chamber 302 projected in the direction of the collection chamber 401. The deflector 5 is used to guide the air flow. The deflector 5 is inclined, and the inclination directions of two adjacent deflectors 5 in the same group are opposite, which is used to guide the liquid precipitated in the air flow to flow downward.

[0040] As Figure 4 and 6 shown, it further includes: a flexible heat insulation part 6, the number of which is the same as the number of the first chambers 302. All are arranged at the position of the rotating frame 3 close to the liquid storage tank 2. The flexible heat insulation part 6 can be made of aerogel material, which is used to reduce the heat conduction performance of the liquid nitrogen temperature. The flexible heat insulation part 6 is used to scrape off the frost condensed on the surfaces of the liquid storage tank 2 and the temperature equalizing part 201.

[0041] The specific working principle is as follows:

[0042] When an operator needs to use this device to remove condensable liquids (hereinafter referred to as liquids) in the gas, the operator connects the vacuum pump to the exhaust pipe 102, and the intake pipe 101 to the vacuum chamber. The operator fills liquid nitrogen into the liquid storage tank 2 and turns on the vacuum pump, so that the gas in the vacuum chamber is drawn into the vacuum pump through the intake pipe 101, the adjacent first chamber 302, the notch of the upper baffle 4, the housing 1 and the exhaust pipe 102. The gas passes through several guide plates 5 distributed up and down in the same group in the first chamber 302 in sequence. The liquid nitrogen in the liquid storage tank 2 cools the gas passing through the guide plates 5 through the temperature equalizing part 201, so that the liquid in the gas gradually condenses, separates the liquid in the gas, and then the separated gas is discharged to the vacuum pump through the exhaust pipe 102.

[0043] With the use of the device, the liquid in the first chamber 302 gradually increases. The operator controls the power component 301 to turn on through the control terminal. The power component 301 controls the rotation of the rotating frame 3, so that the second first chamber 302 is connected to the intake pipe 101 (the rightmost first chamber 302 is first connected to the intake pipe 101, then the second first chamber 302 at the back is connected to the intake pipe 101, and the third first chamber 302 on the left is then connected to the intake pipe 101. In this way, it is sorted counterclockwise so that all the first chambers 302 are connected to the intake pipe 101 in sequence). And when only a single first chamber 302 is connected to the intake pipe 101, the power component 301 stops rotating and makes the rotating frame 3 stop rotating. In this way, the above steps are repeated to make all the first chambers 302 connected to the intake pipe 101 in sequence.

[0044] With the rotation of the rotating frame 3, when the first chamber 302 with frost condensation rotates to be connected to the notch of the lower baffle 4, the temperature equalizing plate 103 conducts the temperature to the first chamber 302 through the hole of the rotating frame 3, so that the frost in the first chamber 302 slowly melts. The liquid formed by the melting of the frost in the first chamber 302 flows downward along the inclined guide plate 5 to the notch of the lower baffle 4, and finally the liquid flows into the collection chamber 401. The operator discharges the liquid in the collection chamber 401 through the external drain pipe and collects the liquid in the collection chamber 401.

[0045] By continuously replacing the first chamber 302 connected to the intake pipe 101 and discharging the liquid in the first chamber 302 to the collection chamber 401, the liquid content in the first chamber 302 through which the air flow passes is reduced, thereby ensuring the stability of the liquid separation in the air flow to reduce the impact of the liquid in the gas on the vacuum pump.

[0046] When the operator needs to stop using the device, the operator turns off the vacuum pump, disconnects the connections between the vacuum pump and the vacuum chamber and the device, then turns off the motor of the power member 301 through the control terminal. Subsequently, the liquid nitrogen in the liquid storage tank 2 is discharged, and the liquid in the collection chamber 401 is discharged through the external drain pipe. Without disassembling the device, the above steps can be repeated to rotate the rotating frame 3 to discharge all the liquid in the first chambers 302 into the collection chamber 401, and the liquid in the device can be simply removed, so as to reduce the disassembly and assembly frequency of the device, thereby reducing the probability of seal failure of the device due to frequent disassembly and assembly, and prolonging the service life of the device.

[0047] During the rotation of the rotating frame 3, the rotating frame 3 drives all the flexible heat insulation parts 6 to rotate, and the flexible heat insulation parts 6 scrape the frost condensed on the surface of the liquid storage tank 2, reducing the amount of frost adhering to the liquid storage tank 2 and the temperature equalizing part 201, so as to ensure the heat exchange efficiency of the temperature equalizing part 201, and make the frost be scraped onto the diversion plate 5, so as to ensure that the melted frost is collected into the collection chamber 401, reducing the influence of the melted frost on the liquid content in the outer shell 1, and further ensuring the dryness in the outer shell 1.

[0048] As Figure 1 、 Figure 7 shown in Figure 8 also includes: a connecting cylinder 7, fixedly connected inside the liquid storage tank 2, a second chamber 701 is arranged between the connecting cylinder 7 and the liquid storage tank 2, the liquid storage tank 2 is fixedly connected with a pressure discharge pipe 702 communicated with the second chamber 701, and the pressure discharge pipe 702 is located on the liquid storage tank 2 near the intake pipe 101; a piston 8, slidably and rotatably connected inside the connecting cylinder 7, the inner diameter of the upper part of the connecting cylinder 7 is larger than that of its lower part, the diameter of the piston 8 is the same as the inner diameter of the lower part of the connecting cylinder 7, by pressing the liquid nitrogen in the connecting cylinder 7 downward through the piston 8, the height of the second chamber 701 is made greater than the height of the rotating frame 3, the piston 8 is fixedly connected with a limit pin 801, a guide groove 802 is arranged inside the connecting cylinder 7, the limit pin 801 slides in the guide groove 802, by rotating the piston 8, the limit pin 801 moves along the guide groove 802, and the piston 8 moves up and down.

[0049] As Figure 1 shown in Figure 7 also includes: a detecting member 9, slidably connected to the liquid storage tank 2, the detecting member 9 is composed of a sliding rod in the upper part and a sealing block in the lower part, there is a gap at the sliding part between the sliding rod of the detecting member 9 and the liquid storage tank 2 for air circulation, the connecting cylinder 7 divides the second chamber 701 into two parts, the sealing block in the lower part of the detecting member 9 seals and slides in the left half part of the second chamber 701, the upper part of the detecting member 9 is located above the liquid storage tank 2 for observing the liquid level of the liquid nitrogen in the second chamber 701 in real time through the height of the detecting member 9, and the height of the detecting member 9 is less than the height of the second chamber 701.

[0050] The specific working principle is as follows:

[0051] When the operator needs to fill liquid nitrogen into the liquid storage tank 2, the operator rotates the piston 8. The piston 8 drives the limit pin 801 to rotate, and the limit pin 801 moves along the guide groove 802, causing the piston 8 to move upward to the upper part of the connecting cylinder 7. A gap is generated between the piston 8 and the connecting cylinder 7. The operator adds liquid nitrogen into the connecting cylinder 7, and the liquid nitrogen flows into the second chamber 701 through the connecting cylinder 7. Then the operator rotates the piston 8 in the reverse direction, causing the limit pin 801 to move in the reverse direction along the guide groove 802. The piston 8 moves downward to the lower part of the connecting cylinder 7 and squeezes the liquid nitrogen in the connecting cylinder 7, squeezing the liquid nitrogen in the connecting cylinder 7 into the second chamber 701, so that the second chamber 701 is filled with liquid nitrogen. The liquid nitrogen squeezes the detecting member 9 upward to the limit position through the liquid pressure generated by it. During the use of liquid nitrogen, the liquid nitrogen volatilizes to the outside through the pressure discharge pipe 702, causing the liquid level of the liquid nitrogen to drop. The detecting member 9 moves downward by gravity. Then the operator rotates the piston 8 to move it downward, and always controls the lower part of the detecting member 9 at the upper part of the second chamber 701, so that the second chamber 701 is always filled with liquid nitrogen, preventing the heat exchange efficiency on the upper side of the temperature equalizing part 201 from decreasing after the liquid nitrogen volatilizes during use, thereby ensuring the stability of the heat exchange efficiency of the temperature equalizing part 201 and improving the stability of the device during use.

[0052] When the operator needs to stop using the device, the operator turns off the vacuum pump, disconnects the connection between the vacuum pump and the vacuum chamber and the device, and then discharges the liquid nitrogen in the liquid storage tank 2 and repeats the steps of the above embodiment to clean the device.

[0053] In summary, the invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement carried out under the spirit and principle of the present invention will be regarded as within the protection scope of the present invention.

Claims

1. An ultra-low temperature cold trap device, characterized in that it comprises: A housing (1), the housing (1) being connected to an air inlet pipe (101) and an exhaust pipe (102), and the housing (1) being fixedly connected to a temperature balancing plate (103); A liquid storage tank (2) is sealed and mounted on the housing (1), wherein a temperature equalizing portion (201) is provided on the liquid storage tank (2) at a position close to the air inlet pipe (101); a rotating frame (3) which is sealingly rotatably connected to the outer shell (1) and is located between the outer shell (1) and the liquid storage tank (2); a power member (301) for driving the rotating frame (3) to rotate is provided on the outer shell (1); the rotating frame (3) is provided with a plurality of first chambers (302) distributed in a circumferential direction; the first chambers (302) are used to connect the intake pipe (101) and the exhaust pipe (102); baffles (4), having two centrally symmetrically distributed baffles (4), both fixedly connected to the housing (1), and respectively located on the upper and lower sides of the rotating frame (3); a collecting chamber (401) is provided between the baffles (4) and the housing (1) at the lower side; and the housing (1) is provided with an external drainage pipe connected to the collecting chamber (401); The air inlet pipe (101) and the exhaust pipe (102) are respectively located on both sides of the housing (1); the baffle plate (4) is provided with a notch; the notch of the upper baffle plate (4) faces the air inlet pipe (101), and the notch of the lower baffle plate (4) faces the exhaust pipe (102); the baffle plate (4) is used to block the first chamber (302); the notch of the upper baffle plate (4) is used to enable the first chamber (302) to communicate with the inside of the housing (1), and the notch of the lower baffle plate (4) is used to enable the first chamber (302) to communicate with the collection chamber (401); The horizontal cross-section of the temperature averaging plate (103) is arc-shaped, the horizontal cross-section of the first chamber (302) is arc-shaped, the temperature averaging plate (103) is located on the housing (1) at a position close to the exhaust pipe (102), and the curvature of the temperature averaging plate (103) is smaller than the curvature of the first chamber (302); The housing (1) is made of a heat-insulating material, the liquid storage tank (2) is made of a heat-insulating material, the rotating frame (3) is made of a heat-insulating material, the baffle (4) is made of a heat-insulating material, and the temperature-averaging plate (103) is used to perform heat exchange between the external environment and the first chamber (302).

2. The ultra-low temperature cold trap device according to claim 1, characterized in that: Also included are: The guide plates (5) have a plurality of groups distributed in a circumferential direction, and the number of the groups is the same as the number of the first chambers (302), and are all fixedly connected to the rotating frame (3). The guide plates (5) in the same group are distributed in adjacent first chambers (302) at intervals in the upper and lower directions. The area of ​​the guide plates (5) projected in the direction of the collecting chamber (401) is smaller than the area of ​​the first chamber (302) projected in the direction of the collecting chamber (401). The guide plates (5) are used to guide airflow.

3. An ultra-low temperature cold trap device according to claim 2, characterized in that: The guide plates (5) are arranged in an inclined manner, and the inclination directions of two adjacent guide plates (5) in the same group are opposite.

4. The ultra-low temperature cold trap device according to claim 2, characterized in that: The obtuse angle formed by the two sides projected from the axis of the shell (1) to the baffle (4) in the direction of the collecting chamber (401) is X, and the acute angle formed by the two sides projected from the axis of the shell (1) to the first chamber (302) in the direction of the collecting chamber (401) is Y, where X=360°-Y.

5. The ultra-low temperature cold trap device according to claim 4, characterized in that: Also included are: The number of the flexible heat insulating parts (6) is the same as the number of the first chambers (302), and both are arranged at positions of the rotating frame (3) close to the liquid storage tank (2). The flexible heat insulating parts (6) are used to scrape off frost condensed on the surfaces of the liquid storage tank (2) and the temperature equalizing part (201).

6. The ultra-low temperature cold trap device according to claim 5, characterized in that: Also included are: A connecting tube (7) is fixedly connected to the liquid storage tank (2); a second chamber (701) is provided between the connecting tube (7) and the liquid storage tank (2); and a pressure relief pipe (702) in communication with the second chamber (701) is fixedly connected to the liquid storage tank (2); The piston (8) is slidably and rotatably connected in the connecting cylinder (7); the piston (8) is fixedly connected to a limit pin (801); a guide groove (802) is provided in the connecting cylinder (7); the limit pin (801) slides in the guide groove (802); after liquid nitrogen is added to the connecting cylinder (7), the liquid nitrogen flows into the second chamber (701) through the connecting cylinder (7).

7. The ultra-low temperature cold trap device according to claim 6, characterized in that: Also included are: A detection member (9) is slidably connected to the liquid storage tank (2), the detection member (9) being composed of a sliding rod and a sealing block, a gap being present at a sliding position between the sliding rod of the detection member (9) and the liquid storage tank (2), the connecting tube (7) dividing the second chamber (701) into two parts, and the sealing block of the detection member (9) sealingly slides in the left half of the second chamber (701).

8. The ultra-low temperature cold trap device according to claim 7, characterized in that: The height of the second chamber (701) is greater than the height of the rotating frame (3), and the height of the detection member (9) is less than the height of the second chamber (701).

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