Liquid nitrogen freezing equipment

Abstract

The utility model relates to the technical field of liquid nitrogen freezing, in particular to liquid nitrogen freezing equipment which comprises a freezing box and a liquid nitrogen tank, the freezing box is connected with the liquid nitrogen tank through a first nitrogen inlet pipe, a groove is formed in the freezing box, and an interlayer is arranged along the inner wall of the groove. A partition layer is arranged in the groove and used for dividing the groove into a freezing groove used for containing workpieces and a mounting groove used for mounting a freezing mechanism, the freezing mechanism comprises two temperature-equalizing motors which are vertically arranged at intervals, an output shaft of each temperature-equalizing motor penetrates through the partition layer and then is connected with a circulating fan, a nitrogen discharging pipe is vertically arranged between the two circulating fans, and the nitrogen discharging pipe is communicated with the two circulating fans. The middle of the nitrogen discharging pipe is communicated with a second nitrogen inlet pipe, the other end of the second nitrogen inlet pipe extends out of the freezing box to be communicated with the first nitrogen inlet pipe, and by means of the technical scheme, the nitrogen discharging device has the advantages that the cooling speed in the freezing box is increased, and the liquid nitrogen utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to a refrigeration device, in particular to a liquid nitrogen refrigeration device. Background Art

[0002] If there is an interference fit between metal or non-metal workpieces, the workpiece size can be reduced by freezing and shrinking to facilitate installation into the assembly hole; liquid nitrogen is the most environmentally friendly and economical freezing and cooling medium in the world so far, so liquid nitrogen is used in refrigeration equipment to cool the workpiece.

[0003] At present, the liquid nitrogen refrigeration equipment on the market, after the freezer is connected to the liquid nitrogen tank, a temperature sensor is set inside the freezer to detect the temperature inside the freezer, and the amount of liquid nitrogen delivered to the freezer is controlled according to the detected temperature. However, after the liquid nitrogen enters the freezer, it usually accumulates, which makes it impossible to quickly reduce the temperature of the entire freezer, and the liquid nitrogen is not fully utilized, resulting in low utilization efficiency of the liquid nitrogen. Utility Model Content

[0004] In order to solve the problems in the related art, the present application provides a liquid nitrogen refrigeration device, which solves the problems of slow temperature drop efficiency in the freezer and low utilization rate of liquid nitrogen.

[0005] The technical solution is as follows:

[0006] A liquid nitrogen refrigeration device comprises a freezing box and a liquid nitrogen tank, wherein the freezing box is connected to the liquid nitrogen tank via a first nitrogen inlet pipe, wherein a groove is arranged in the freezing box, and a partition is arranged along the inner wall of the groove, for dividing the groove into a freezing groove for placing a workpiece and an installation groove for installing a freezing mechanism, wherein the freezing mechanism comprises two vertically spaced-apart temperature-averaging motors, wherein the output shaft of each temperature-averaging motor is connected to a circulation fan after passing through the partition, wherein a nitrogen exhaust pipe is vertically arranged between the two circulation fans, wherein the middle part of the nitrogen exhaust pipe is connected to a second nitrogen inlet pipe, and the other end of the second nitrogen inlet pipe extends out of the freezing box and is connected to the first nitrogen inlet pipe.

[0007] Through the above technical solution and the setting of the refrigeration mechanism, when liquid nitrogen enters the freezing box, the air in the entire freezing box is stirred by the circulating fan to put it in a circulating state, thereby accelerating the contact speed and contact area between air and liquid nitrogen, thereby accelerating the cooling speed in the freezing box and improving the utilization rate of liquid nitrogen.

[0008] Preferably, a nitrogen inlet is provided on the side wall of the nitrogen exhaust pipe, and the second nitrogen inlet pipe comprises a first nitrogen pipe, one end of the first nitrogen pipe is connected to the nitrogen inlet, and the other end of the first nitrogen pipe passes through the partition and is arranged in the installation groove;

[0009] The first nitrogen pipe located in the mounting groove is connected to a liquid nitrogen control valve, the other end of the liquid nitrogen control valve is connected to a second nitrogen pipe, the other end of the second nitrogen pipe extends out of the freezer, a safety valve is provided on the second nitrogen pipe located in the freezer, and a liquid nitrogen interface is provided on the second nitrogen pipe outside the freezer; the other end of the liquid nitrogen interface is connected to the first nitrogen inlet pipe.

[0010] Preferably, a touch control screen is provided on the freezer, and the temperature-averaging motor, liquid nitrogen control valve and safety valve are respectively connected to the touch control screen.

[0011] Preferably, a partition is provided on one side of the freezing tank close to the mounting tank, and a plurality of through holes are provided on the partition.

[0012] Through the above technical solution, by setting the partition, the workpiece placed in the freezing tank for cooling can be prevented from being affected by the circulating fan, thereby ensuring the smooth progress of the cooling work in the freezer.

[0013] Preferably, a door is provided on the freezer box on one side of the freezing tank, and the door and the freezer box are rotatably matched; a sealing strip is provided on the side end surface of the door close to the freezing tank, and when the door is in a closed state, the sealing strip is located on the freezer box at the outer periphery of the freezing tank.

[0014] Preferably, an exhaust hole is provided on the freezing box on the other side of the freezing tank, and the exhaust hole is connected to an exhaust pipe.

[0015] Through the above technical solution, by setting the exhaust hole, when liquid nitrogen cools the objects in the freezing tank, a large amount of gas will evaporate after absorbing heat. After these gases are discharged from the exhaust pipe, the pressure in the freezer can be kept stable; and the oxygen in the freezer can be discharged through the exhaust hole to avoid combustion or explosion due to the strong oxidizing property of liquid nitrogen, thereby ensuring safety in use.

[0016] Preferably, a plurality of sliding wheels are provided at the bottom of the freezer.

[0017] Through the above technical solution, by arranging sliding wheels at the bottom of the freezer, the freezer can be moved more conveniently and used more conveniently, thereby improving the use efficiency.

[0018] In summary, the beneficial effects of liquid nitrogen freezing equipment are:

[0019] 1. Through the setting of the refrigeration mechanism, when the liquid nitrogen enters the freezer, the air in the entire freezer is stirred by the circulating fan to make it in a circulating state, thereby accelerating the contact speed and contact area between the air and the liquid nitrogen, thereby accelerating the cooling speed in the freezer and improving the utilization rate of the liquid nitrogen;

[0020] 2. Through the setting of two through holes on the partition, when the motor drives the circulation fan to rotate, the air can be circulated faster; and through the setting of the partition, the workpiece placed in the freezing tank for cooling can be prevented from being affected by the circulation fan, thereby ensuring the smooth cooling work in the freezer.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0023] Figure 1 It is a connection diagram of a specific embodiment 1 of a liquid nitrogen freezing device;

[0024] Figure 2 It is a connection diagram of specific embodiment 2 in the liquid nitrogen freezing equipment;

[0025] Figure 3 It is a structural schematic diagram of a freezer in a liquid nitrogen freezing device in an open door state;

[0026] Figure 4 It is a schematic diagram of the structure of the freezing mechanism in the liquid nitrogen freezing equipment;

[0027] Figure 5 is a cross-sectional view of a partition in a liquid nitrogen freezing device;

[0028] Figure 6 is a cross-sectional view of a freezing box in a liquid nitrogen freezing device;

[0029] Figure 7 It is a top view of a freezing box in a liquid nitrogen freezing device;

[0030] In the figure, 1. freezer; 2. liquid nitrogen tank; 3. first nitrogen inlet pipe; 4. partition; 5. freezing tank; 6. mounting slot; 7. temperature-averaging motor; 8. circulation fan; 9. nitrogen exhaust pipe; 10. first nitrogen pipe; 11. second nitrogen pipe; 12. liquid nitrogen control valve; 13. safety valve; 14. liquid nitrogen interface; 15. touch control screen; 16. partition; 17. box door; 18. sealing strip; 19. exhaust pipe; 20. sliding wheel. DETAILED DESCRIPTION

[0031] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.

[0032] Specific embodiment 1, as attached Figure 1 , 3 -7, a liquid nitrogen refrigeration device comprises a freezing box 1 and a liquid nitrogen tank 2, the freezing box 1 is connected to the liquid nitrogen tank 2 through a first nitrogen inlet pipe 3, a groove is arranged in the freezing box 1, and a partition 4 is arranged along the inner wall of the groove, for dividing the groove into a freezing groove 5 for placing a workpiece and an installation groove 6 for installing a freezing mechanism, the partition 4 is a heat-insulating partition, and the freezing mechanism comprises two vertically spaced temperature-averaging motors 7, and the output shaft of each temperature-averaging motor 7 passes through the partition 4 and is connected to a circulating fan 8, and a nitrogen exhaust pipe 9 is vertically arranged between the two circulating fans 8, and the nitrogen exhaust pipe 9 is a liquid nitrogen gasification device, which belongs to the prior art, such as the patent with application number CN202121805903.9, and the middle part of the nitrogen exhaust pipe 9 is connected to a second nitrogen inlet pipe, and the other end of the second nitrogen inlet pipe extends out of the freezing box 1 and is connected to the first liquid nitrogen pipe.

[0033] When liquid nitrogen enters the freezing box 1, the air in the entire freezing box 1 is stirred by the circulation fan 8 to make it in a circulation state, thereby accelerating the contact speed and contact area between air and liquid nitrogen, thereby accelerating the cooling speed in the freezing box 1 and improving the utilization rate of liquid nitrogen.

[0034] A nitrogen inlet is provided on the side wall of the nitrogen exhaust pipe 9, and the second nitrogen inlet pipe includes a first nitrogen pipe 10, one end of the first nitrogen pipe 10 is connected to the nitrogen inlet, and the other end of the first nitrogen pipe 10 passes through the partition 4 and is arranged in the installation groove 6;

[0035] The first nitrogen pipe 10 located in the installation groove 6 is connected to a liquid nitrogen control valve 12, the other end of the liquid nitrogen control valve 12 is connected to a second nitrogen pipe 11, the other end of the second nitrogen pipe 11 extends out of the freezer 1, a safety valve 13 is provided on the second nitrogen pipe 11 located in the freezer 1, and a liquid nitrogen interface 14 is provided on the second nitrogen pipe 11 located outside the freezer 1; the other end of the liquid nitrogen interface 14 is connected to the first nitrogen inlet pipe 3, such as Figure 1 As shown, when the liquid storage tank contains a large amount of liquid nitrogen, the liquid storage tank will not move easily, so it is connected through the first nitrogen inlet pipe 3, and the first nitrogen inlet pipe 3 may pass through the wall, so a nitrogen inlet control valve and a safety valve 13 may be additionally provided on the first nitrogen inlet pipe 3 to ensure the safety of nitrogen inlet.

[0036] A touch control screen 15 is provided on the freezer 1, and the temperature-averaging motor 7, the liquid nitrogen control valve 12 and the safety valve 13 are respectively connected to the touch control screen 15, and the pressure range value of the safety valve 13 can be preset through the touch control panel.

[0037] A partition 16 is provided on one side of the freezing tank 5 close to the mounting tank 6, and a plurality of through holes are provided on the partition 16. In the present specific embodiment, two through holes with the same structure are provided, and the two through holes correspond to the positions of the two circulation fans 8 respectively; the partition 16 can prevent the workpiece placed in the freezing tank 5 for cooling from being affected by the circulation fan 8, thereby ensuring the smooth cooling work in the freezer 1.

[0038] A door 17 is provided on the freezer box 1 on one side of the freezing groove 5, and the door 17 and the freezer box 1 are matched in a rotational manner; a sealing strip 18 is provided on the side end surface of the door 17 close to the freezing groove 5, and when the door 17 is in a closed state, the sealing strip 18 is located on the freezer box 1 at the outer periphery of the freezing groove 5.

[0039] An exhaust hole is provided on the freezer box 1 on the other side of the freezing tank 5, and the exhaust hole is connected to the exhaust pipe 19; when liquid nitrogen cools the objects in the freezing tank 5, a large amount of gas will evaporate after absorbing heat, and after these gases are discharged from the exhaust pipe 19, the pressure in the freezer box 1 can be kept stable; and the oxygen in the freezer box 1 can be discharged through the exhaust hole to avoid combustion or explosion due to the strong oxidizing property of liquid nitrogen, thereby ensuring safety in use.

[0040] A plurality of sliding wheels 20 are provided at the bottom of the freezer box 1; the sliding wheels 20 can make the freezer box 1 more convenient to move and use, thereby improving the use efficiency.

[0041] Specific embodiment 2, as attached Figure 2-7 As shown, the liquid nitrogen refrigeration equipment includes a freezing box 1 and a liquid nitrogen tank 2. The freezing box 1 is connected to the liquid nitrogen tank 2 through a first nitrogen inlet pipe 3. A groove is provided in the freezing box 1, and a partition 4 is provided along the inner wall of the groove, which is used to divide the groove into a freezing groove 5 for placing a workpiece and an installation groove 6 for installing a freezing mechanism. The partition 4 is a heat-insulating partition. The freezing mechanism includes two vertically spaced temperature-averaging motors 7. The output shaft of each temperature-averaging motor 7 passes through the partition 4 and is connected to a circulating fan 8. A nitrogen exhaust pipe 9 is vertically arranged between the two circulating fans 8. The nitrogen exhaust pipe 9 is a liquid nitrogen gasification device, which belongs to the prior art, such as the patent with application number CN202121805903.9. The middle part of the nitrogen exhaust pipe 9 is connected to a second nitrogen inlet pipe, and the other end of the second nitrogen inlet pipe extends out of the freezing box 1 and is connected to the first liquid nitrogen pipe 3.

[0042] When liquid nitrogen enters the freezing box 1, the air in the entire freezing box 1 is stirred by the circulation fan 8 to make it in a circulation state, thereby accelerating the contact speed and contact area between air and liquid nitrogen, thereby accelerating the cooling speed in the freezing box 1 and improving the utilization rate of liquid nitrogen.

[0043] A nitrogen inlet is provided on the side wall of the nitrogen exhaust pipe 9, and the second nitrogen inlet pipe includes a first nitrogen pipe 10, one end of the first nitrogen pipe 10 is connected to the nitrogen inlet, and the other end of the first nitrogen pipe 10 passes through the partition 4 and is arranged in the installation groove 6;

[0044] The first nitrogen pipe 10 located in the installation groove 6 is connected to a liquid nitrogen control valve 12, the other end of the liquid nitrogen control valve 12 is connected to a second nitrogen pipe 11, the other end of the second nitrogen pipe 11 extends out of the freezer 1, a safety valve 13 is provided on the second nitrogen pipe 11 located in the freezer 1, and a liquid nitrogen interface 14 is provided on the second nitrogen pipe 11 located outside the freezer 1; the other end of the liquid nitrogen interface 14 is connected to the first nitrogen inlet pipe 3, such as Figure 2 As shown, when the liquid storage tank contains a small amount of liquid nitrogen, the liquid storage tank can be easily moved, so it is arranged near the freezing box 1 after being connected through the first nitrogen inlet pipe 3.

[0045] A touch control screen 15 is provided on the freezer 1, and the temperature-averaging motor 7, the liquid nitrogen control valve 12 and the safety valve 13 are respectively connected to the touch control screen 15, and the pressure range value of the safety valve 13 can be preset through the touch control panel.

[0046] A partition 16 is provided on one side of the freezing tank 5 close to the mounting tank 6, and a plurality of through holes are provided on the partition 16. In the present specific embodiment, two through holes with the same structure are provided, and the two through holes correspond to the positions of the two circulation fans 8 respectively; the partition 16 can prevent the workpiece placed in the freezing tank 5 for cooling from being affected by the circulation fan 8, thereby ensuring the smooth cooling work in the freezer 1.

[0047] A door 17 is provided on the freezer box 1 on one side of the freezing groove 5, and the door 17 and the freezer box 1 are matched in a rotational manner; a sealing strip 18 is provided on the side end surface of the door 17 close to the freezing groove 5, and when the door 17 is in a closed state, the sealing strip 18 is located on the freezer box 1 at the outer periphery of the freezing groove 5.

[0048] An exhaust hole is provided on the freezer box 1 on the other side of the freezing tank 5, and the exhaust hole is connected to the exhaust pipe 19; when liquid nitrogen cools the objects in the freezing tank 5, a large amount of gas will evaporate after absorbing heat, and after these gases are discharged from the exhaust pipe 19, the pressure in the freezer box 1 can be kept stable; and the oxygen in the freezer box 1 can be discharged through the exhaust hole to avoid combustion or explosion due to the strong oxidizing property of liquid nitrogen, thereby ensuring safety in use.

[0049] A plurality of sliding wheels 20 are provided at the bottom of the freezer box 1; the sliding wheels 20 can make the freezer box 1 more convenient to move and use, thereby improving the use efficiency.

[0050] Operation principle: After the freezer 1 is connected to the nitrogen storage tank through the first nitrogen inlet pipe 3, the workpiece is placed in the freezing tank 5, and the temperature-averaging motor 7 is controlled to start through the touch control screen 15, driving the circulating fan 8 to stir the air in the freezer 1. At this time, after the liquid nitrogen transported through the nitrogen exhaust pipe 9 enters the freezer 1, the temperature-averaging motor 7 drives the circulating fan 8 to stir the air in the freezer 1, which can speed up the air cooling speed, thereby speeding up the cooling rate and ensuring the utilization rate of liquid nitrogen. In the process, the amount of liquid nitrogen can be controlled by the liquid nitrogen control valve 12. When the pressure in the freezer 1 is too high, the safety valve 13 is started to ensure the safety of the freezer 1.

[0051] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the utility model herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not applicable to the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0052] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A liquid nitrogen freezing device, comprising a freezing box and a liquid nitrogen tank, wherein the freezing box is connected to the liquid nitrogen tank via a first nitrogen inlet pipe, wherein a groove is arranged in the freezing box, and a partition is arranged along the inner wall of the groove, for dividing the groove into a freezing groove for placing a workpiece and an installation groove for installing a freezing mechanism, wherein: The refrigeration mechanism includes two vertically spaced temperature-averaging motors, the output shaft of each temperature-averaging motor is connected to a circulation fan after passing through the partition, a nitrogen exhaust pipe is vertically arranged between the two circulation fans, the middle of the nitrogen exhaust pipe is connected to a second nitrogen inlet pipe, and the other end of the second nitrogen inlet pipe extends out of the freezer and is connected to the first nitrogen inlet pipe.

2. The liquid nitrogen freezing equipment according to claim 1, characterized in that: A nitrogen inlet is provided on the side wall of the nitrogen exhaust pipe, and the second nitrogen inlet pipe includes a first nitrogen pipe, one end of the first nitrogen pipe is connected to the nitrogen inlet, and the other end of the first nitrogen pipe passes through the partition and is arranged in the installation groove; The first nitrogen pipe located in the mounting groove is connected to a liquid nitrogen control valve, the other end of the liquid nitrogen control valve is connected to a second nitrogen pipe, the other end of the second nitrogen pipe extends out of the freezer, a safety valve is provided on the second nitrogen pipe located in the freezer, and a liquid nitrogen interface is provided on the second nitrogen pipe outside the freezer; the other end of the liquid nitrogen interface is connected to the first nitrogen inlet pipe.

3. The liquid nitrogen freezing equipment according to claim 2, characterized in that: The freezer is provided with a touch control screen, and the temperature-averaging motor, the liquid nitrogen control valve and the safety valve are respectively connected to the touch control screen.

4. The liquid nitrogen freezing equipment according to claim 1, characterized in that: A partition is arranged on one side of the freezing tank close to the mounting tank, and a plurality of through holes are arranged on the partition.

5. The liquid nitrogen freezing equipment according to claim 1, characterized in that: A door is provided on the freezer box on one side of the freezing tank, and the door and the freezer box are rotatably matched; a sealing strip is provided on the side end surface of the door close to the freezing tank, and when the door is in a closed state, the sealing strip is located on the freezer box at the outer periphery of the freezing tank.

6. The liquid nitrogen freezing equipment according to claim 1, characterized in that: An exhaust hole is arranged on the freezing box at the other side of the freezing tank, and the exhaust hole is connected with an exhaust pipe.

7. The liquid nitrogen freezing equipment according to claim 1, characterized in that: A plurality of sliding wheels are arranged at the bottom of the freezing box.

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