A multi-channel ice box for continuous low temperature experiment

Abstract

The application discloses a sustained low-temperature type experimental multi-channel ice box, which comprises an ice box body, a main containing mechanism arranged at the central position of the inside of the ice box body, a low-temperature cooling cavity formed at the lower part of the inside of the ice box body, a main on-off mechanism arranged at the central position of the inside of the ice box body, and a vice on-off mechanism arranged at the four corners of the inside of the ice box body. The main on-off mechanism is arranged below the main containing mechanism and is used for conveying low-temperature cooling to the inside of the main containing mechanism. The sustained low-temperature type experimental multi-channel ice box is characterized in that different specifications of containers are placed in the containing mechanism of the inside of the ice box body, the low-temperature cooling cavity and the containing mechanism are in communication with each other, the cold air in the low-temperature cooling cavity can be conveyed to the lower part of the container through the opened on-off mechanism, the loss of cold air at other positions is prevented, and the cooling effect of the whole ice box body is improved.

Description

Technical Field

[0001] This invention relates to the field of ice box technology, specifically to a multi-channel ice box for continuous low-temperature experiments. Background Technology

[0002] An ice box is a box made of PE material that can be repeatedly frozen and reused. The ice box contains a refrigerant and can be used in experiments to extract cells and other operations, to process biological samples in a low-temperature environment, and to quickly freeze and preserve them to avoid repeated freeze-thaw cycles. Temperature monitoring throughout the entire process is a basic requirement for the preservation of biological samples.

[0003] Publication No. CN206868258U discloses an ice box for low-temperature operation. When the experiment takes a long time and the crushed ice melts and the volume decreases, the support rod of the first layer of the support is adjusted to the avoidance position, the support rod of the second layer of the support is adjusted to the working position, and the test tube rack is placed on the support rod of the second layer. In this embodiment, the support is set with three layers, and the specific number of layers can be adjusted according to the experiment time. Similarly, when the crushed ice melts again, the support frame can be placed on the support rod of the third layer of the support.

[0004] Publication No. CN208465921U discloses an EP tube cooling box. By designing the upper end of the cooling box to be higher than the upper end of the EP tube, and the horizontal line of the coolant filling height to be higher than the upper end of the EP tube, the EP tube can be fully cooled by the coolant. Compared with the existing technology, the box structure is simpler.

[0005] However, the ice packs used in the experiments mentioned above still have the following problems in actual use: Although the ice packs can cool centrifuge tubes and vessels through their cooling effect, they will continue to cool down after being removed from the freezer, and the cell extraction work above the ice packs will also heat up. At the same time, the existing ice packs cannot limit and fix the vessels being operated on, and they are prone to displacement and slippage during operation, which will affect the cell extraction work.

[0006] Therefore, we propose a multi-channel ice box for continuous low-temperature experiments to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a continuous low-temperature multi-channel ice box for experiments, in order to solve the problems mentioned in the background art. Although the existing ice boxes can cool centrifuge tubes and vessels through the cooling effect after the ice box is refrigerated, they start to cool down continuously after the ice box is removed from the freezer. The cell extraction work above the ice box will also heat up. At the same time, the existing ice boxes cannot limit and fix the vessels being operated, which makes them prone to displacement and slippage during operation, thus affecting the cell extraction work.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a multi-channel ice box for continuous low-temperature experiments, comprising an ice box body and a main receiving mechanism disposed at the center of the ice box body, and a secondary receiving mechanism disposed at each of the four corners of the ice box body.

[0009] The ice box body has a low-temperature cooling cavity at the bottom inside;

[0010] It also includes: a main on / off mechanism is provided at the center of the interior of the ice box body, and auxiliary on / off mechanisms are provided at the four corners of the interior of the ice box body;

[0011] The main switching mechanism is located directly below the main housing mechanism and is used to deliver low-temperature cooling to the interior of the main housing mechanism.

[0012] The secondary switching mechanism is located directly below the secondary receiving mechanism and is used to deliver low-temperature cooling to the interior of the secondary receiving mechanism.

[0013] Preferably, the symmetrically distributed secondary receiving mechanism includes a centrifuge tube support frame, and the bottom end of the symmetrically arranged centrifuge tube support frame is slidably disposed inside the secondary on / off mechanism. The symmetrically arranged centrifuge tube support frame is connected to the inner wall of the ice box body by a return spring. Moreover, the left and right sides of the bottom surface of the symmetrically arranged centrifuge tube support frame are rotatably connected to the outer end of the first contact valve plate by torsion springs.

[0014] Preferably, the symmetrically arranged secondary switching mechanism includes a switching pipe, and the bottom end of the symmetrically arranged switching pipe is connected to the interior of the low-temperature cooling cavity, and the top left and right sides of the symmetrically arranged switching pipe are rotatably connected to the outer end of the second contact valve plate by torsion springs.

[0015] Preferably, the top center of the low-temperature cooling cavity is connected to the bottom of the main switching mechanism, and the main switching mechanism includes a first one-way valve plate. The first one-way valve plates are evenly distributed on the inner top surface of the main switching mechanism, and the evenly distributed first one-way valve plates are flipped open by the contact of the elastic telescopic rod.

[0016] Preferably, the main receiving mechanism inside the ice box body includes a lifting plate, and the bottom surface of the lifting plate is rotatably provided with a guide shaft via a torsion spring. The left end of the guide shaft is fixedly provided with an abutting flip rod, and the outer end of the abutting flip rod abuts between the lifting plate and the ice box body.

[0017] Preferably, elastic telescopic rods are fixedly installed at equal intervals on the outer walls of the front and rear sides of the guide shaft below the lifting plate, and a water-removing wiping disc is rotatably installed inside the top surface of the lifting plate through a torsion spring, and the bottom end of the water-removing wiping disc is connected to the left end of the guide shaft through a traction cable.

[0018] Preferably, the main containing mechanism includes a main low-temperature connecting column, which is slidably disposed at the center of the ice box body at equal angles. The main low-temperature connecting columns distributed at equal angles are connected to the inner wall of the ice box body by guide springs, and the bottom ends of the main low-temperature connecting columns distributed at equal angles slide inside the main on / off mechanism.

[0019] Preferably, the bottom end of the main cryogenic connecting column inside the main receiving mechanism is connected to the inside of the main switching mechanism, and the main switching mechanism also includes a second one-way valve plate, and the second one-way valve plate is rotatably disposed inside the top surface of the main switching mechanism at equal angles, and the second one-way valve plates distributed at equal angles are flipped open by the contact of the main cryogenic connecting column.

[0020] Preferably, the interior of the ice box body has secondary low-temperature connecting columns distributed at equal intervals, and the bottom ends of the secondary low-temperature connecting columns are slidably disposed inside the main on / off mechanism. The main on / off mechanism also includes third one-way valve plates distributed at equal intervals, and the third one-way valve plates are flipped open by the contact of the secondary low-temperature connecting columns.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: This multi-channel ice box for continuous low-temperature experiments uses containers of different sizes placed in the receiving mechanism inside the ice box body, so that the low-temperature cooling chamber and the receiving mechanism are interconnected. This allows the cold air inside the low-temperature cooling chamber to be transported to the bottom of the container through an open and closed mechanism, thereby preventing the loss of cold air from other locations and improving the overall cooling effect of the ice box body. The specific details are as follows:

[0022] 1. By pressing down the main container mechanism, the container is flipped, causing the elastic telescopic rod to contact the first one-way valve plate inside the main on / off mechanism and open, so that the low-temperature cooling chamber and the main container mechanism can be connected to each other, and the container that needs to be operated can be cooled to ensure its low temperature.

[0023] 2. By placing containers of different sizes inside the main receiving mechanism, the bottom of the containers presses against the main low-temperature connecting column, causing the main low-temperature connecting column to open the corresponding main on / off mechanism, so as to deliver low-temperature cooling to the area below the containers in a targeted manner, preventing the cooling airflow inside the opened main on / off mechanism from spreading in all directions.

[0024] 3. By placing containers of different sizes into the main receiving mechanism inside the ice box body, the corresponding secondary low-temperature connecting column is driven to slide downward, thereby flipping the corresponding third one-way valve plate downward and opening it. This allows the cold air inside the low-temperature cooling chamber to be transported to the bottom of the container through the opened main on / off mechanism, thus preventing the loss of cold air from other locations and improving the overall cooling effect of the ice box body. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure in Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the ice box body in Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the lifting disc in Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the cross-sectional structure of the lifting disc in Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the guide shaft mounting structure in Embodiment 1 of the present invention;

[0030] Figure 6 This is a schematic diagram of the cross-sectional structure of the centrifuge tube support frame in Embodiment 1 of the present invention;

[0031] Figure 7 This is a schematic diagram of the cross-sectional structure of the on / off pipe in Embodiment 1 of the present invention;

[0032] Figure 8 This is a schematic diagram of the overall three-dimensional structure in Embodiment 2 of the present invention;

[0033] Figure 9 This is a schematic diagram of the second one-way valve plate mounting structure in Embodiment 2 of the present invention;

[0034] Figure 10 This is a schematic diagram of the overall three-dimensional structure of Embodiment 3 of the present invention;

[0035] Figure 11 This is a schematic diagram of the installation structure of the third one-way valve plate in Embodiment 3 of the present invention.

[0036] In the diagram: 1. Ice box body; 2. Low-temperature cooling chamber; 3. Centrifuge tube support frame; 4. Return spring; 5. First contact valve plate; 6. Support plate; 7. Guide shaft; 8. Contact flipping rod; 9. Elastic telescopic rod; 10. Water removal and wiping plate; 11. Traction cable; 12. Main low-temperature connecting column; 13. Guide spring; 14. On / off pipe; 15. Second contact valve plate; 16. First one-way valve plate; 17. Second one-way valve plate; 18. Secondary low-temperature connecting column; 19. Third one-way valve plate. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-11 The present invention provides the following technical solution:

[0039] Example 1: In order to solve the problems existing in the prior art, this example adopts the following technical solution: by flipping the guide shaft 7 of the main receiving mechanism under the pressure of the vessel, the elastic telescopic rod 9 is opened by contacting the first one-way valve plate 16 inside the main on / off mechanism, so that the low temperature cooling chamber 2 and the main receiving mechanism are interconnected, and the vessel that needs to be operated is cooled to ensure its low temperature.

[0040] A multi-channel ice box for continuous low-temperature experiments includes an ice box body 1 and a main receiving mechanism located at the center of the ice box body 1, with secondary receiving mechanisms located at each of the four corners of the ice box body 1. A low-temperature cooling chamber 2 is provided at the lower part of the interior of the ice box body 1. A main on / off mechanism is located at the center of the interior of the ice box body 1, and secondary on / off mechanisms are located at the four corners of the interior of the ice box body 1. The main on / off mechanism is located directly below the main receiving mechanism and is used to deliver low-temperature cooling to the interior of the main receiving mechanism. The secondary on / off mechanisms are located directly below the secondary receiving mechanisms and are used to deliver low-temperature cooling to the interior of the secondary receiving mechanisms.

[0041] The symmetrically distributed secondary receiving mechanism includes a centrifuge tube support frame 3, and the bottom end of the symmetrically arranged centrifuge tube support frame 3 is slidably disposed inside the secondary on / off mechanism. The symmetrically arranged centrifuge tube support frame 3 is connected to the inner wall of the ice box body 1 by a return spring 4. Moreover, the left and right sides of the bottom surface of the symmetrically arranged centrifuge tube support frame 3 are rotatably connected to the outer end of the first contact valve plate 5 by torsion springs.

[0042] The symmetrically arranged secondary switching mechanism includes a switching pipe 14, and the bottom end of the symmetrically arranged switching pipe 14 is connected to the interior of the low-temperature cooling chamber 2. The top left and right sides of the symmetrically arranged switching pipe 14 are rotatably connected to the outer end of the second contact valve plate 15 by torsion springs.

[0043] like Figure 2 , Figures 6-7As shown, after the refrigerant in the low-temperature cooling chamber 2 inside the ice box body 1 is cooled and solidified, the centrifuge tubes are placed in the secondary receiving mechanisms at the four corners of the ice box body 1. This causes the centrifuge tubes to drive the centrifuge tube support frame 3 inside the secondary receiving mechanism to slide downwards first. Then, the bottom end of the centrifuge tube support frame 3 abuts against the second abutting valve plates 15 on the left and right sides of the top of the switching pipe 14 inside the secondary switching mechanism. This causes the second abutting valve plates 15 on the left and right sides to flip outwards simultaneously. When the second abutting valve plates 15 on both sides flip, the first abutting valve plates 5 on the left and right sides of the bottom end of the centrifuge tube support frame 3 flip inwards simultaneously. At the same time, the bottom end of the centrifuge tube support frame 3 and the top end of the switching pipe 14 are connected and interlocked, so that the cold air inside the low-temperature cooling chamber 2 can be transported to the centrifuge tube support frame 3 through the switching pipe 14, thereby providing low-temperature cooling for the placed centrifuge tubes.

[0044] The main housing mechanism inside the ice box body 1 includes a lifting plate 6, and a guide shaft 7 is rotatably provided on the bottom surface of the lifting plate 6 via a torsion spring. A contact flipping rod 8 is fixedly provided on the left end of the guide shaft 7, and the outer end of the contact flipping rod 8 abuts against the lifting plate 6 and the ice box body 1.

[0045] The top center of the low-temperature cooling chamber 2 is connected to the bottom of the main switching mechanism, and the main switching mechanism includes a first one-way valve plate 16. The first one-way valve plates 16 are evenly distributed on the inner top surface of the main switching mechanism, and the evenly distributed first one-way valve plates 16 are flipped open by the contact of the elastic telescopic rod 9.

[0046] like Figures 2-5 As shown, when the container is placed in the main receiving mechanism inside the ice box body 1, the weight of the container causes the lifting plate 6 to slide downwards. At the same time, the abutting flipping rod 8 installed between the lifting plate 6 and the main receiving mechanism is squeezed, causing the guide shaft 7 to rotate. The guide shaft 7 drives the elastic telescopic rods 9, which are evenly distributed on the outer wall, to rotate from a horizontal state to a vertical state. The top of the elastic telescopic rod 9 abuts against the bottom surface of the lifting plate 6, and the bottom of the elastic telescopic rod 9 abuts against and flips the first one-way valve plate 16 inside the main on / off mechanism. This allows the cold air inside the low-temperature cooling chamber 2 to be transported to the bottom of the container through the connected main on / off mechanism and the main receiving mechanism, thereby providing low-temperature cooling for the container.

[0047] Elastic telescopic rods 9 are fixed at equal distances on the front and rear outer walls of the guide shaft 7 below the lifting plate body 6, and a water removal and wiping plate 10 is rotatably installed inside the top surface of the lifting plate body 6 through a torsion spring, and the bottom end of the water removal and wiping plate 10 is connected to the left end of the guide shaft 7 through a traction cable 11.

[0048] like Figure 5As shown, when the vessel is removed from the main receiving mechanism after the operation is completed, the guide shaft 7 connected by the torsion spring is reset and rotated, thereby winding and tightening the traction cable 11. At the same time, the traction cable 11 drives the water-removing wiping plate 10 inside the lifting plate 6, which is connected by the torsion spring, to rotate, so that the condensed water droplets gathered on the bottom surface of the vessel are wiped and absorbed, preventing dripping and affecting the use of the vessel.

[0049] Example 2: This example discloses another low-temperature cooling method for vessels, which differs from Example 1 and can provide adaptive limiting during operation for vessels of different sizes, such as... Figures 8-9 As shown, containers of different sizes are placed inside the main receiving mechanism. After the bottom of the container is pressed against the main low-temperature connecting column 12, the main on / off mechanism is opened so that the low-temperature cooling supply can be delivered to the bottom of the container in a targeted manner.

[0050] The main receiving mechanism includes a main low-temperature connecting column 12, which is slidably disposed at the center of the ice box body 1 at equal angles. The main low-temperature connecting columns 12, which are slidably disposed at equal angles, are connected to the inner wall of the ice box body 1 by guide springs 13. The bottom end of the main low-temperature connecting columns 12, which are slidably disposed at equal angles, slides inside the main on / off mechanism.

[0051] The bottom end of the main cryogenic connecting column 12 inside the main receiving mechanism is connected to the inside of the main switching mechanism. The main switching mechanism also includes a second one-way valve plate 17. The second one-way valve plate 17 is rotatably disposed inside the top surface of the main switching mechanism at equal angles. The second one-way valve plates 17, which are distributed at equal angles, are flipped open by the contact of the main cryogenic connecting column 12.

[0052] Different sized containers are placed inside the main receiving mechanism. The containers, by their own weight, cause the corresponding main low-temperature connecting column 12 inside the main receiving mechanism to slide downwards. This causes the sliding main low-temperature connecting column 12 to contact the corresponding second one-way valve plate 17 inside the main on / off mechanism and flip open. This allows the cold air inside the low-temperature cooling chamber 2 to be transported to the bottom of the containers through the opened main on / off mechanism, thereby preventing the loss of cold air from other locations.

[0053] Example 3: This example discloses another cryogenic cooling method for all operating containers, which differs from Example 1 and can provide adaptive limiting for all operating containers during operation, such as... Figures 10-11As shown, containers of different sizes are placed in the main receiving mechanism inside the ice box body 1, and the corresponding secondary low-temperature connecting column 18 slides down, thereby flipping the corresponding third one-way valve plate 19 down and opening it, so that the cold air inside the low-temperature cooling chamber 2 can be delivered to the bottom of the container through the opened main on / off mechanism, thereby preventing the loss of cold air in other places and improving the overall cooling effect of the ice box body 1.

[0054] The interior of the ice box body 1 is provided with secondary low-temperature connecting columns 18 distributed at equal intervals. The bottom ends of the secondary low-temperature connecting columns 18 are slidably disposed inside the main switching mechanism. The main switching mechanism also includes third one-way valve plates 19 distributed at equal intervals. The third one-way valve plates 19 are flipped open by the contact of the secondary low-temperature connecting columns 18.

[0055] When operating on containers of all different sizes, the container to be placed is placed in the main receiving mechanism inside the ice box body 1. The bottom surface of the container abuts against the corresponding secondary low-temperature connecting column 18, and the weight of the container itself causes the corresponding secondary low-temperature connecting column 18 to slide downward, so that the descending secondary low-temperature connecting column 18 abuts against the corresponding third one-way valve plate 19 and flips downward to open. This allows the opened third one-way valve plate 19 to deliver the cooling airflow through the descending secondary low-temperature connecting column 18 to the container, preventing the cooling airflow from diffusing in other directions, thereby preventing the loss of cold air in other locations and improving the overall cooling effect of the ice box body 1.

[0056] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," "main," "subsidiary," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-channel ice box for continuous low temperature experiments, comprising an ice box body (1) and a main receiving mechanism disposed at the center of the ice box body (1), and a secondary receiving mechanism disposed at each of the four corners of the ice box body (1). The ice box body (1) has a low-temperature cooling cavity (2) at the bottom inside; Its features are, Also includes: The main switch mechanism is provided at the center of the ice box body (1), and the auxiliary switch mechanisms are provided at the four corners of the ice box body (1). The main switching mechanism is located directly below the main housing mechanism and is used to deliver low-temperature cooling to the interior of the main housing mechanism. The secondary switching mechanism is located directly below the secondary receiving mechanism, and is used to deliver low-temperature cooling to the interior of the secondary receiving mechanism. The symmetrically distributed secondary receiving mechanism includes a centrifuge tube support frame (3), and the bottom end of the symmetrically arranged centrifuge tube support frame (3) is slidably disposed inside the secondary switching mechanism. The symmetrically arranged centrifuge tube support frame (3) is connected to the inner wall of the ice box body (1) by a reset spring (4). Moreover, the left and right sides of the bottom surface of the symmetrically arranged centrifuge tube support frame (3) are rotatably connected to the outer end of the first contact valve plate (5) by a torsion spring. The symmetrically arranged secondary switching mechanism includes a switching pipe (14), and the bottom end of the symmetrically arranged switching pipe (14) is connected to the interior of the low-temperature cooling chamber (2), and the top left and right sides of the symmetrically arranged switching pipe (14) are rotatably connected to the outer end of the second contact valve plate (15) by torsion springs.

2. The multi-channel ice box for continuous low-temperature experiments according to claim 1, characterized in that: The top center of the low-temperature cooling chamber (2) is connected to the bottom of the main switching mechanism, and the main switching mechanism includes a first one-way valve plate (16). The first one-way valve plates (16) are evenly distributed on the inner top surface of the main switching mechanism, and the evenly distributed first one-way valve plates (16) are flipped open by the contact of the elastic telescopic rod (9).

3. The multi-channel ice box for continuous low-temperature experiments according to claim 2, characterized in that: The main housing mechanism inside the ice box body (1) includes a lifting plate (6), and the bottom surface of the lifting plate (6) is provided with a guide shaft (7) through a torsion spring. The left end of the guide shaft (7) is fixedly provided with an abutting flip rod (8), and the outer end of the abutting flip rod (8) abuts between the lifting plate (6) and the ice box body (1).

4. A multi-channel ice box for continuous low-temperature experiments according to claim 3, characterized in that: Elastic telescopic rods (9) are fixed at equal distances on the front and rear outer walls of the guide shaft (7) below the lifting plate (6), and a water removal wiping plate (10) is rotatably installed inside the top surface of the lifting plate (6) through a torsion spring. The bottom end of the water removal wiping plate (10) is connected to the left end of the guide shaft (7) through a traction cable (11).

5. A multi-channel ice box for continuous low-temperature experiments according to claim 1, characterized in that: The main receiving mechanism includes a main low-temperature connecting column (12), and the main low-temperature connecting column (12) is slidably disposed at the center of the ice box body (1) at equal angles. The main low-temperature connecting columns (12) distributed at equal angles are connected to the inner wall of the ice box body (1) by guide springs (13), and the bottom end of the main low-temperature connecting column (12) distributed at equal angles slides inside the main on / off mechanism.

6. A multi-channel ice box for continuous low-temperature experiments according to claim 5, characterized in that: The bottom end of the main low-temperature connecting column (12) inside the main receiving mechanism is connected to the inside of the main switching mechanism. The main switching mechanism also includes a second one-way valve plate (17). The second one-way valve plate (17) is rotatably disposed inside the top surface of the main switching mechanism at equal angles. The second one-way valve plates (17) distributed at equal angles are flipped open by the contact of the main low-temperature connecting column (12).

7. A multi-channel ice box for continuous low-temperature experiments according to claim 1, characterized in that: The ice box body (1) has secondary low-temperature connecting columns (18) evenly distributed inside, and the bottom ends of the secondary low-temperature connecting columns (18) are all slidably disposed inside the main switching mechanism. The main switching mechanism also contains a third one-way valve plate (19) evenly distributed inside, and the third one-way valve plate (19) is flipped open by the contact of the secondary low-temperature connecting columns (18).

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