Throw-in type liquid nitrogen pump

Abstract

The utility model relates to the technical field of liquid nitrogen pumps, in particular to a throw-in type liquid nitrogen pump which comprises a throw-in type liquid nitrogen pump body and a positive / negative pressure generating part structure. The throw-in type liquid nitrogen pump body comprises a pump body shell, a pump body cavity is formed in the pump body shell, a liquid suction pipe is arranged in the pump body cavity, the inner end of the liquid suction pipe penetrates out of the pump body cavity and is connected with a pressure guide pipe, a control valve is arranged at the far end of the pressure guide pipe, and the pressure guide pipe is further connected with the positive / negative pressure generation part structure. The outer end of the liquid suction pipe penetrates out of the pump body cavity to form a liquid suction opening, and a liquid suction one-way valve is installed at the outer end of the liquid suction pipe. The utility model has the characteristics of simple structural design, no need of sealing, and suitability for liquid nitrogen tanks with various different calibers.

Description

Technical Field

[0001] This utility model relates to the field of liquid nitrogen pump technology, and in particular to an immersion liquid nitrogen pump. Background Technology

[0002] A liquid nitrogen pump is a cryogenic device used to dispense liquid nitrogen from a liquid nitrogen biological container. It is used in conjunction with liquid nitrogen tanks for liquid nitrogen output and transfer, and with laboratory equipment for liquid nitrogen replenishment. Applications include filling small Dewars, filling CCD detector Dewars, filling Dewars integrated into FTIR infrared spectrometers, cryogenic systems for liquid nitrogen-cooled thermal analyzers (TGA, STA, TMA, DMA, DMTA), cryogenic systems for cyclically cooled lasers, cyclically cooled electron microscopes, cyclically cooled cryogenic platforms, cyclically cooled MCT detectors, and cryogenic systems for cyclically cooled small samples.

[0003] Current liquid nitrogen pumps require sealing the discharge tank and have specific requirements regarding container diameter. Typically, a single liquid nitrogen pump can only be used with biological containers of a corresponding diameter, and the pressure cannot exceed 50 kPa. Therefore, they are highly limited and lack versatility, making it impossible to use liquid nitrogen pumps for discharge from many large-diameter biological containers.

[0004] Therefore, how to provide a simple, unsealed, and applicable liquid nitrogen pump suitable for various diameter liquid nitrogen tanks has become a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this utility model is how to provide a simple structural design, no need for sealing, and applicable to liquid nitrogen tanks of various different diameters.

[0006] To achieve the above objectives, this utility model provides an immersion liquid nitrogen pump, comprising an immersion liquid nitrogen pump body and a positive / negative pressure generating section structure; characterized in that: the immersion liquid nitrogen pump body includes a pump body shell, inside which a pump body chamber is formed, a suction pipe is arranged in the pump body chamber, the inner end of the suction pipe extends to the outside of the pump body chamber and is connected to a pressure tapping pipe, a control valve is provided at the distal end of the pressure tapping pipe, and the pressure tapping pipe is also connected to the positive / negative pressure generating section structure; the outer end of the suction pipe extends to the outside of the pump body chamber and forms a suction port, and a suction check valve is installed at the outer end of the suction pipe; a connection port extending through the wall thickness direction is provided on the side wall of the outer end of the suction pipe, allowing the suction pipe to communicate with the pump body chamber, and a discharge check valve is provided at the connection port; a discharge pipe is also arranged in the pump body chamber, the inner end of the discharge pipe extends to the outside of the pump body chamber and forms a discharge port.

[0007] As an optimization, the pump body chamber is designed with a cylindrical structure, and the suction pipe and discharge pipe are arranged along the axial direction of the pump body chamber.

[0008] As an optimization, a pressure tapping tube interface is provided at the inner end of the suction tube, and the pressure tapping tube connection is set on the pressure tapping tube connector; an outlet connector is provided at the inner end of the outlet tube.

[0009] As an optimization, an intermediate tube is connected to the connection port at the far end of the suction tube, and the liquid outlet check valve is installed on the intermediate tube.

[0010] Furthermore, the intermediate tube extends into the inner side of the inner circumferential wall of the suction tube.

[0011] As an optimization, the pump body housing includes a housing cylinder, with housing plates provided at both ends of the housing cylinder; and the pump body chamber is formed between the housing cylinder and the two housing plates.

[0012] As an optimization, a beveled structure is provided at the outer end of the suction tube.

[0013] As an optimization, the positive / negative pressure generating part includes a housing with a rectangular box structure, a cylinder is provided inside the housing, the cylinder is provided with positive / negative pressure ports and connected to a connecting pipe, and the connecting pipe is connected to the pressure tapping pipe; a driving mechanism is provided inside the housing and corresponding to the piston rod end of the cylinder, and the driving mechanism is connected to the piston rod of the cylinder and can drive the piston inside the cylinder to move to generate positive / negative pressure.

[0014] As an optimization, the drive mechanism includes a drive motor; it also includes a slider that can be slidably disposed longitudinally within the housing, the slider having a through hole disposed longitudinally, a connecting rod disposed within the through hole, one end of the connecting rod being connected to the piston rod end of the cylinder; the other end of the connecting rod being connected to the power output end of the drive motor via a crank mechanism.

[0015] Furthermore, a mounting plate is provided inside the housing, and the slider is fitted onto the mounting plate in a longitudinally movable manner.

[0016] Furthermore, the crank mechanism includes a first crank rod hinged to the power output end of the drive motor, a second crank rod hinged to the distal end of the first crank rod, and the distal end of the second crank rod hinged to the end of the connecting rod.

[0017] Furthermore, a speed regulator is also installed inside the housing, which is connected to the electronic control terminal of the drive motor.

[0018] Furthermore, the control valve at the distal end of the pressure tapping pipe is a pressure relief safety valve.

[0019] The working principle of the above-described submersible liquid nitrogen pump is as follows: The pump body is immersed in liquid nitrogen, the pressure relief valve is closed, and the power is turned on to energize the drive motor and start working. The drive motor drives the crank mechanism, which in turn pushes and pulls the piston rod of the cylinder via a connecting rod. This achieves a suction and push action on the liquid nitrogen within the pump body. When the cylinder spindle pushes backward, a negative pressure is generated in the suction pipe, closing the outlet check valve and opening the suction check valve, allowing liquid nitrogen to be drawn into the suction pipe. When the cylinder piston rod pulls forward, a positive pressure is generated in the suction pipe, closing the suction check valve and opening the outlet check valve, pushing the liquid nitrogen into the pump body chamber and then into the outlet pipe. This cycle continues until the liquid nitrogen is discharged. Connecting a delivery pipe to the liquid nitrogen outlet connector allows the liquid nitrogen to be transported to a designated area. During use, the liquid nitrogen flow rate can be controlled via a motor speed controller. When drainage is not required, the pressure relief valve can be opened to prevent accidental activation and sudden drainage.

[0020] The device described above can be used without sealing and can control the flow rate well; secondly, the device has better adaptability and can be adapted to liquid nitrogen tanks of various diameters.

[0021] In terms of structural design, the submersible liquid nitrogen pump body has a simpler and more reasonable design, making it easier to process and manufacture, and the connection structure between the various parts is more reliable.

[0022] The positive / negative pressure generating section has a simple structure, making it easier to adjust. Furthermore, the driving section is more stable and efficient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the submersible liquid nitrogen pump in a specific embodiment of this utility model.

[0024] Figure 2 yes Figure 1 A schematic diagram of the submersible liquid nitrogen pump body.

[0025] Figure 3 yes Figure 2 A schematic diagram of the structure after omitting the outer shell.

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure after rotation by one angle.

[0027] Figure 5 yes Figure 1 A schematic diagram of the positive / negative pressure generation part of the structure.

[0028] Figure 6 yes Figure 5 A structural diagram omitting the cover.

[0029] Figure 7 yes Figure 6 A schematic diagram of the structure after rotation by one angle. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for 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 manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] like Figures 1 to 7 As shown, an immersion liquid nitrogen pump includes an immersion liquid nitrogen pump body 1 and a positive / negative pressure generating section structure 2. The immersion liquid nitrogen pump body includes a pump body shell 3, inside which a pump body chamber is formed. A suction pipe 4 is arranged in the pump body chamber. The inner end of the suction pipe extends to the outside of the pump body chamber and is connected to a pressure tapping pipe 5. A control valve 6 is provided at the distal end of the pressure tapping pipe, and the pressure tapping pipe is also connected to the positive / negative pressure generating section structure. The outer end of the suction pipe extends to the outside of the pump body chamber and forms a suction port 7. A suction check valve 8 is installed at the outer end of the suction pipe. A connection port extending through the wall thickness direction is provided on the side wall of the outer end of the suction pipe, so that the suction pipe communicates with the pump body chamber. A discharge check valve 9 is provided at the connection port. A discharge pipe 10 is also arranged in the pump body chamber. The inner end of the discharge pipe extends to the outside of the pump body chamber and forms a discharge port.

[0032] In this specific embodiment, the pump body chamber is designed as a cylindrical structure, and the suction pipe and the discharge pipe are arranged along the axial direction of the pump body chamber.

[0033] In this specific embodiment, a pressure-sensing tube interface 11 is connected to the inner end of the suction tube, and the pressure-sensing tube is connected to the pressure-sensing tube connector; an outlet connector 12 is connected to the inner end of the outlet tube.

[0034] In this specific embodiment, an intermediate tube 13 is connected to the connection port at the far end of the suction tube, and the liquid outlet check valve is installed on the intermediate tube.

[0035] Furthermore, the intermediate tube extends into the inner side of the inner circumferential wall of the suction tube.

[0036] As an optimization, the pump body housing includes a housing cylinder 14, with housing plates 15 provided at both ends of the housing cylinder; and the pump body chamber is formed between the housing cylinder and the two housing plates.

[0037] In this specific embodiment, a chamfered structure is provided at the outer end of the suction tube. This better prevents blockage at the outer end of the connecting tube sleeve.

[0038] In this specific embodiment, the positive / negative pressure generating part structure includes a housing 16 with a rectangular box structure design, a cylinder 17 is provided inside the housing, the cylinder is provided with positive / negative pressure ports and connected to a connecting pipe 18, and the connecting pipe is connected to a pressure-inducing pipe; a driving mechanism is provided inside the housing and corresponding to the piston rod end of the cylinder, and the driving mechanism is connected to the piston rod of the cylinder and can drive the piston in the cylinder to move to generate positive / negative pressure.

[0039] In this way, the structural design of the positive / negative pressure generating section is simpler, more reasonable, and easier to use.

[0040] In this specific embodiment, the driving mechanism includes a drive motor 19; it also includes a slider 20 that can be slidably disposed longitudinally in the housing, the slider having a through hole that runs longitudinally through it, and a connecting rod 21 disposed in the through hole, one end of the connecting rod being connected to the piston rod end of the cylinder; the other end of the connecting rod being connected to the power output end of the drive motor through a crank mechanism.

[0041] Furthermore, a mounting plate 22 is provided inside the housing, and the slider is fitted onto the mounting plate in a longitudinally movable manner. This makes it easier to install and assemble the slider.

[0042] Furthermore, the crank mechanism includes a first crank rod 23 hinged to the power output end of the drive motor, a second crank rod 24 hinged to the distal end of the first crank rod, and the distal end of the second crank rod hinged to the end of the connecting rod.

[0043] Furthermore, a speed controller 25 is also installed inside the housing, which is connected to the electronic control terminal of the drive motor. This allows for better control of the drive motor's speed, thereby improving flow control.

[0044] Furthermore, the control valve at the distal end of the pressure tap is a pressure relief safety valve. This improves the safety of the equipment during use.

[0045] The working principle of the above-described submersible liquid nitrogen pump is as follows: The pump body is immersed in liquid nitrogen, the pressure relief valve is closed, and the power is turned on to energize the drive motor and start working. The drive motor drives the crank mechanism, which in turn pushes and pulls the piston rod of the cylinder via a connecting rod. This achieves a suction and push action on the liquid nitrogen within the pump body. When the cylinder spindle pushes backward, a negative pressure is generated in the suction pipe, closing the outlet check valve and opening the suction check valve, allowing liquid nitrogen to be drawn into the suction pipe. When the cylinder piston rod pulls forward, a positive pressure is generated in the suction pipe, closing the suction check valve and opening the outlet check valve, pushing the liquid nitrogen into the pump body chamber and then into the outlet pipe. This cycle continues until the liquid nitrogen is discharged. Connecting a delivery pipe to the liquid nitrogen outlet connector allows the liquid nitrogen to be transported to a designated area. During use, the liquid nitrogen flow rate can be controlled via a motor speed controller. When drainage is not required, the pressure relief valve can be opened to prevent accidental activation and sudden drainage.

[0046] The device described above can be used without sealing and can control the flow rate well; secondly, the device has better adaptability and can be adapted to liquid nitrogen tanks of various diameters.

[0047] In terms of structural design, the submersible liquid nitrogen pump body has a simpler and more reasonable design, making it easier to process and manufacture, and the connection structure between the various parts is more reliable.

[0048] The positive / negative pressure generating section has a simple structure, making it easier to adjust. Furthermore, the driving section is more stable and efficient.

[0049] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A submersible liquid nitrogen pump, comprising a submersible liquid nitrogen pump body and a positive / negative pressure generating section; characterized in that; The submersible liquid nitrogen pump body includes a pump body shell, inside which a pump body chamber is formed. A suction pipe is arranged in the pump body chamber, with its inner end extending to the outside of the pump body chamber and connected to a pressure tapping pipe. A control valve is installed at the distal end of the pressure tapping pipe, which is also connected to the positive / negative pressure generating structure. The outer end of the suction pipe extends to the outside of the pump body chamber and forms a suction port, with a suction check valve installed at the outer end of the suction pipe. A connection port extending through the wall thickness of the outer end of the suction pipe is provided, allowing the suction pipe to communicate with the pump body chamber. A discharge check valve is installed at the connection port. A discharge pipe is also arranged in the pump body chamber, with its inner end extending to the outside of the pump body chamber and forming a discharge port.

2. The submersible liquid nitrogen pump as described in claim 1, characterized in that; The pump body chamber is designed with a cylindrical structure, and the suction pipe and discharge pipe are arranged along the axial direction of the pump body chamber.

3. The submersible liquid nitrogen pump as described in claim 1, characterized in that; A pressure-sensing tube interface is connected to the inner end of the suction tube, and the pressure-sensing tube is connected to the pressure-sensing tube connector; an outlet connector is connected to the inner end of the outlet tube.

4. The submersible liquid nitrogen pump as described in claim 1, characterized in that; An intermediate tube is connected to the connection port at the far end of the suction tube, and the liquid outlet check valve is installed on the intermediate tube.

5. A submersible liquid nitrogen pump as described in claim 1, characterized in that; The pump body housing includes a housing cylinder, with housing plates at each end of the housing cylinder; and the pump body chamber is formed between the housing cylinder and the two housing plates.

6. The submersible liquid nitrogen pump as described in claim 1, characterized in that; A beveled structure is provided at the outer end of the suction tube.

7. The submersible liquid nitrogen pump as described in claim 1, characterized in that; The positive / negative pressure generating part includes a housing with a rectangular box structure. A cylinder is installed inside the housing. The cylinder has positive / negative pressure ports and is connected to a connecting pipe, which is connected to a pressure-inducing pipe. A driving mechanism is installed inside the housing and at the piston rod end of the cylinder. The driving mechanism is connected to the piston rod of the cylinder and can drive the piston inside the cylinder to move and generate positive / negative pressure.

8. A submersible liquid nitrogen pump as described in claim 7, characterized in that; The drive mechanism includes a drive motor; it also includes a slider that can be slidably disposed longitudinally within the housing, the slider having a through hole that extends longitudinally through it, a connecting rod disposed within the through hole, one end of the connecting rod being connected to the piston rod end of the cylinder; the other end of the connecting rod being connected to the power output end of the drive motor via a crank mechanism.

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