Liquid nitrogen quick-freezing device with automatic temperature control function

Abstract

The utility model belongs to the technical field of liquid nitrogen freezing, and particularly relates to a liquid nitrogen quick-freezing device with an automatic temperature control function. The top of the freezing box is fixedly connected with a motor; a limiting plate is fixedly connected to the inner side wall of the freezing box; the output end of the motor is fixedly connected with a screw rod; the lead screw is connected with a limiting block through a lead screw nut pair. The side wall of the limiting block is fixedly connected with a connecting rod; the bottom of the connecting rod is fixedly connected with a pair of fixing rods; the pair of fixing rods are symmetrically arranged; through the arrangement of a filter screen, a fixing rod and a connecting rod, the probability that when materials for freezing operation in the placing assembly need to be stored and taken, due to the fact that a large amount of liquid nitrogen exists in the placing assembly, the materials are difficult to store and take can be effectively reduced, and the usability of the whole device is effectively enhanced; meanwhile, through the arrangement of a motor, a limiting plate, a lead screw and a limiting block, the filter screen can be used more simply, quickly, conveniently and safely, and the usability of the whole device is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid nitrogen freezing, in particular to a liquid nitrogen quick-freezing device with an automatic temperature control function. Background Art

[0002] Liquid nitrogen generally refers to the liquid form of nitrogen formed under low temperature conditions. It is an inert, colorless, odorless, non-corrosive and non-flammable substance. Liquid nitrogen can generally be used as a deep refrigerant for rapid freezing of materials.

[0003] In the prior art, a liquid nitrogen quick-freezing device generally refers to a device that uses liquid nitrogen at an extremely low temperature to quickly freeze the material. It can reduce the material temperature to below -18°C in a short period of time, ensuring that the material is quickly frozen in the best condition.

[0004] During long-term observation, it was found that most liquid nitrogen quick-freezing devices are difficult to store or retrieve materials for freezing operations in the freezer because there is a large amount of liquid nitrogen in the freezer. Due to its extremely low temperature, the liquid nitrogen will quickly absorb heat when it comes into contact with the skin, causing frostbite, making it difficult to store or retrieve materials.

[0005] To this end, the utility model provides a liquid nitrogen quick-freezing device with an automatic temperature control function. Utility Model Content

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the problems raised in the background art, a liquid nitrogen quick-freezing device with automatic temperature control function is proposed.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: the liquid nitrogen quick-freezing device with automatic temperature control function described in the present invention comprises a freezing chamber; a motor is fixedly connected to the top of the freezing chamber; a limit plate is fixedly connected to the inner side wall of the freezing chamber; a screw is fixedly connected to the output end of the motor; the screw is connected to the limit block through a screw nut pair; a connecting rod is fixedly connected to the side wall of the limit block; a pair of fixing rods are fixedly connected to the bottom of the connecting rod; the pair of fixing rods are symmetrically arranged; the ends of the pair of fixing rods are fixedly connected to the same filter; a placement assembly is provided inside the freezing chamber; and an exhaust assembly is provided at the top of the freezing chamber. The arrangement of the filter, fixing rod, and connecting rod can effectively reduce the probability of difficulty in accessing materials in the placement assembly when it is necessary to store and access materials for freezing operation due to a large amount of liquid nitrogen in the placement assembly, thereby effectively enhancing the overall usability of the device. At the same time, the arrangement of the motor, limit plate, screw, and limit block can make the use of the filter simpler, faster, more convenient, and safer, further improving the overall usability of the device.

[0008] Preferably, the placement component includes a storage cylinder; the storage cylinder is fixedly connected to the bottom of the inner wall of the freezer; a conveying groove is opened in the middle of the storage cylinder; a plurality of discharge holes are opened in the inner wall of the storage cylinder; the discharge holes and the conveying groove are communicated with each other; a first conveying pipe is fixedly connected to the top of the storage cylinder, and the first conveying pipe passes through the side wall of the freezer; the conveying groove and the first conveying pipe are communicated with each other; the arrangement of the storage cylinder, the conveying groove and the discharge hole can effectively reduce the probability of the problem of difficulty in replenishing the liquid nitrogen inside the storage cylinder when the material requires continuous cooling with liquid nitrogen because the overall continuous replenishment of liquid nitrogen is not comprehensive, thereby effectively enhancing the overall stability of the device, and at the same time, the arrangement of the first conveying pipe can make the injection of liquid nitrogen into the conveying groove simpler, faster and more convenient, further improving the overall usability of the device.

[0009] Preferably, the exhaust component includes a second delivery pipe; the freezer and the second delivery pipe are connected to each other; the inner side wall of the end of the second delivery pipe away from the freezer is fixedly connected to a fixed bracket; the top of the fixed bracket is fixedly connected to a heating wire; the end of the second delivery pipe close to the fixed bracket is connected to an air pump; the arrangement of the air pump and the second delivery pipe can effectively reduce the probability of abnormal working conditions of components inside the freezer, damage to stored materials, and increased safety hazards due to the increase in volume after liquid nitrogen sublimates into gaseous nitrogen and the incomplete exhaust arrangement of the entire device, thereby effectively enhancing the overall stability of the device. At the same time, the arrangement of the fixed bracket and the heating wire can effectively heat the inner wall of the second delivery pipe, effectively reducing the probability of crystallized impurities adhering to the inner wall of the second delivery pipe due to temperature difference, thereby reducing the service life of the second delivery pipe, and further improving the overall stability of the device.

[0010] Preferably, the output end of the air pump is fixedly connected to a third delivery pipe; the end of the third delivery pipe is fixedly connected to a storage box; the inner wall of the storage box is fixedly connected to a fourth delivery pipe near the third delivery pipe; the third delivery pipe and the fourth delivery pipe are connected to each other; the inner wall of the storage box is fixedly connected to multiple groups of fixed blocks, which are symmetrically arranged; an adsorption carbon plate is installed on the top of the fixed block; the arrangement of the third delivery pipe, the fourth delivery pipe and the storage box can effectively reduce the probability of the subsequent waste gas treatment work becoming more difficult due to the incomplete arrangement of the overall gaseous nitrogen storage of the device, thereby further improving the overall usability of the device, and at the same time, the arrangement of the fixed blocks and the adsorption carbon plates can effectively adsorb the gaseous nitrogen, further reducing the working time of the subsequent waste gas treatment.

[0011] Preferably, the end of the fourth conveying pipe is fixedly connected with a guide cover; a guide groove is provided inside the guide cover; a plurality of air outlets are provided on the top of the guide cover; the guide groove and the air outlet are interconnected; the guide cover and the fourth conveying pipe are interconnected; the arrangement of the guide cover, the guide groove and the air outlet can effectively guide the gaseous nitrogen discharged into the storage box, effectively increase the contact area between the exhaust gas and the adsorption carbon plate, and effectively reduce the probability of the problem of poor adsorption effect caused by the incomplete arrangement of the exhaust gas diversion of the entire device, thereby limiting the adsorption area of the exhaust gas on the adsorption carbon plate, thereby further improving the overall stability of the device.

[0012] Preferably, a guide plate is fixedly connected to the inner wall of the storage cylinder near the discharge hole; the guide plate is arranged at an angle; the arrangement of the guide plate can effectively reduce the probability of liquid nitrogen flowing back into the discharge hole, effectively enhance the overall freezing efficiency of the device, and effectively improve the overall reliability of the device.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. The liquid nitrogen quick-freezing device with automatic temperature control function described in the utility model can effectively reduce the probability of difficulty in accessing materials placed in the freezing component due to the large amount of liquid nitrogen in the component when the materials need to be stored and accessed, through the arrangement of the filter, fixing rod, and connecting rod, thereby effectively enhancing the overall usability of the device. At the same time, the arrangement of the motor, limit plate, screw rod, and limit block can make the use of the filter simpler, faster, more convenient, and safer, further improving the overall usability of the device.

[0015] 2. The liquid nitrogen quick-freezing device with automatic temperature control function described in the present invention can effectively reduce the probability of difficulty in replenishing the liquid nitrogen in the storage cylinder when the material requires continuous cooling with liquid nitrogen due to the incomplete configuration of the overall continuous replenishment of liquid nitrogen in the device, thereby effectively enhancing the overall stability of the device. At the same time, the provision of the first delivery pipe can make it simpler, faster and more convenient to inject liquid nitrogen into the delivery trough, further improving the overall usability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a three-dimensional diagram of the freezer in the present utility model;

[0018] Figure 2 It is a cross-sectional view of the freezer in the utility model;

[0019] Figure 3It is a cross-sectional view of the second delivery pipe in the present utility model;

[0020] Figure 4 This is a structural diagram of the screw rod and filter screen in the utility model;

[0021] Figure 5 It is a cross-sectional view of the storage cylinder in the present utility model;

[0022] Figure 6 It is a cross-sectional view of the storage box in the utility model;

[0023] Legend:

[0024] 1. Freezer; 11. Motor; 12. Limit plate; 13. Screw rod; 14. Connecting rod; 15. Limit block; 16. Fixing rod; 17. Filter; 2. Storage cylinder; 21. First delivery pipe; 22. Discharge hole; 23. Delivery trough; 3. Second delivery pipe; 31. Heating wire; 32. Fixing bracket; 33. Air pump; 4. Storage box; 41. Third delivery pipe; 42. Fourth delivery pipe; 43. Fixing block; 44. Adsorption carbon plate; 5. Air deflector; 51. Guide trough; 52. Air outlet; 6. Air deflector; 7. Sealing plug; 71. Exhaust pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Specific examples are given below.

[0027] like Figures 1 to 6As shown, a liquid nitrogen quick-freezing device with automatic temperature control function described in an embodiment of the present invention includes a freezing box 1; a motor 11 is fixedly connected to the top of the freezing box 1; a limit plate 12 is fixedly connected to the inner side wall of the freezing box 1; a screw rod 13 is fixedly connected to the output end of the motor 11; the screw rod 13 is connected to the limit block 15 through a screw nut pair; the side wall of the limit block 15 is fixedly connected to a connecting rod 14; a pair of fixing rods 16 are fixedly connected to the bottom of the connecting rod 14; the pair of fixing rods 16 are symmetrically arranged; the ends of a pair of fixing rods 16 are fixedly connected to the same filter 17; a placement component is provided inside the freezing box 1; an exhaust component is provided at the top of the freezing box 1; when working, the material to be cooled is first placed above the filter 17, and then a certain amount of liquid nitrogen is injected into the placement component, and then the power supply of the motor 11 is started to drive the screw rod 13 to start rotating, and then the screw rod 13 will The limit block 15 is driven to move by the screw-nut pair, and then the limit block 15 will drive the connecting rod 14, the fixing rod 16, and the filter screen 17 to move up and down in sequence. Then, when the filter screen 17 enters the interior of the placement component and the material is completely soaked in liquid nitrogen, the power supply of the motor 11 can be turned off, and then the hatch of the freezer 1 can be closed to achieve the purpose of freezing the material. The arrangement of the filter screen 17, the fixing rod 16, and the connecting rod 14 can effectively reduce the probability of difficulty in accessing materials when the material for freezing operation in the placement component needs to be stored and accessed because there is a large amount of liquid nitrogen in the placement component, thereby effectively enhancing the overall usability of the device. At the same time, the arrangement of the motor 11, the limit plate 12, the screw rod 13, and the limit block 15 can make the use of the filter screen 17 simpler, faster, more convenient, and safer, further improving the overall usability of the device.

[0028] like Figure 2 and Figure 5As shown, the placement component includes a storage cylinder 2; the storage cylinder 2 is fixedly connected to the bottom of the inner wall of the freezer 1; a conveying groove 23 is opened in the middle of the storage cylinder 2; a plurality of discharge holes 22 are opened on the inner wall of the storage cylinder 2; the discharge holes 22 and the conveying groove 23 are communicated with each other; a first conveying pipe 21 is fixedly connected to the top of the storage cylinder 2, and the first conveying pipe 21 passes through the side wall of the freezer 1; the conveying groove 23 and the first conveying pipe 21 are communicated with each other; if it is necessary to keep the material warm during operation, the pre-prepared liquid nitrogen can be injected from the first conveying pipe 21, and the liquid nitrogen will be transported to the inside of the conveying groove 23 through the first conveying pipe 21, and then from Multiple discharge holes 22 discharge into the interior of the storage cylinder 2, and liquid nitrogen can be continuously replenished through the first delivery pipe 21, thereby achieving the purpose of continuously freezing the material at a low temperature; the arrangement of the storage cylinder 2, the delivery trough 23, and the discharge holes 22 can effectively reduce the probability of the problem of difficulty in replenishing the liquid nitrogen inside the storage cylinder 2 when the material requires continuous cooling with liquid nitrogen because the overall continuous replenishment of liquid nitrogen in the device is not comprehensive, thereby effectively enhancing the overall stability of the device. At the same time, the arrangement of the first delivery pipe 21 can make it simpler, faster and more convenient to inject liquid nitrogen into the delivery trough 23, further improving the overall usability of the device.

[0029] like Figure 1 and Figure 3 As shown, the exhaust assembly includes a second delivery pipe 3; the freezing chamber 1 and the second delivery pipe 3 are connected to each other; the inner side wall of the end of the second delivery pipe 3 away from the freezing chamber 1 is fixedly connected to a fixed bracket 32; the top of the fixed bracket 32 is fixedly connected to a heating wire 31; the end of the second delivery pipe 3 close to the fixed bracket 32 is connected to an air pump 33; when it is necessary to discharge the gaseous nitrogen during operation, the power supply of the air pump 33 can be started, and the air pump 33 will suck out the gaseous nitrogen inside the freezing chamber 1 through the second delivery pipe 3 to achieve the purpose of discharging the gaseous nitrogen. At this time, the power supply of the heating wire 31 can be turned on to continuously heat the inner wall of the second delivery pipe 3 to reduce crystallization caused by temperature difference. Purpose; the arrangement of the air pump 33 and the second delivery pipe 3 can effectively reduce the probability of abnormal working conditions of components inside the freezer 1, damage to stored materials, and increased safety hazards due to the increase in volume after liquid nitrogen sublimates into gaseous nitrogen, and the incomplete exhaust arrangement of the entire device, thereby effectively enhancing the overall stability of the device. At the same time, the arrangement of the fixed bracket 32 and the heating wire 31 can effectively heat the inner wall of the second delivery pipe 3, effectively reducing the probability of crystallized impurities adhering to the inner wall of the second delivery pipe 3 due to temperature difference, thereby reducing the service life of the second delivery pipe 3, and further improving the overall stability of the device.

[0030] like Figure 3 and Figure 6As shown, the output end of the air pump 33 is fixedly connected to a third delivery pipe 41; the end of the third delivery pipe 41 is fixedly connected to a storage box 4; a fourth delivery pipe 42 is fixedly connected to the inner wall of the storage box 4 near the third delivery pipe 41; the third delivery pipe 41 and the fourth delivery pipe 42 are interconnected; the inner wall of the storage box 4 is fixedly connected to multiple groups of fixed blocks 43, and are symmetrically arranged; an adsorption carbon plate 44 is installed on the top of the fixed block 43; when the air pump 33 is working, when the gaseous nitrogen inside the freezer 1 is extracted, the gaseous nitrogen will be discharged into the fourth delivery pipe 42 through the third delivery pipe 41 and then discharged into the storage box 4. At this time, the gaseous nitrogen will be adsorbed from bottom to top by different adsorption carbon plates 44 to achieve the purpose of storing and filtering the gaseous nitrogen; the arrangement of the third delivery pipe 41, the fourth delivery pipe 42, and the storage box 4 can effectively reduce the probability of the subsequent waste gas treatment work becoming more difficult due to the difficulty in collecting the discharged gaseous nitrogen due to the incomplete arrangement of the gaseous nitrogen storage of the entire device, thereby further improving the overall usability of the device. At the same time, the arrangement of the fixed block 43 and the adsorption carbon plate 44 can effectively adsorb the gaseous nitrogen, further reducing the working time of the subsequent waste gas treatment.

[0031] like Figure 6 As shown, the end of the fourth delivery pipe 42 is fixedly connected with a deflector 5; a deflector groove 51 is provided inside the deflector 5; a plurality of air outlets 52 are provided on the top of the deflector 5; the deflector groove 51 and the air outlet 52 are interconnected; the deflector 5 and the fourth delivery pipe 42 are interconnected; when working, when the gaseous nitrogen is discharged into the storage box 4 through the fourth delivery pipe 42, it will first be discharged into the deflector 5. At this time, the gaseous nitrogen will pass through the deflector groove 51 and the air outlet 52 in turn and then be discharged into the storage box 4 to achieve the purpose of guiding the gaseous nitrogen; through the arrangement of the deflector 5, the deflector groove 51 and the air outlet 52, the gaseous nitrogen discharged into the storage box 4 can be effectively guided, the contact area between the exhaust gas and the adsorption carbon plate 44 is effectively increased, and the probability of the problem of poor adsorption effect caused by the incomplete arrangement of the exhaust gas diversion of the entire device is effectively reduced, thereby further improving the overall stability of the device.

[0032] like Figure 5 As shown, a guide plate 6 is fixedly connected to the inner wall of the storage cylinder 2 near the discharge hole 22; the guide plate 6 is arranged at an angle; when working, the guide plate 6 will guide the liquid nitrogen after it flows out of the discharge hole 22, and at the same time, the guide plate 6 will reduce the liquid nitrogen from flowing back into the discharge hole 22, so as to achieve the purpose of guiding and preventing the liquid nitrogen from flowing back; the setting of the guide plate 6 can effectively reduce the probability of liquid nitrogen flowing back into the discharge hole 22, effectively enhance the overall freezing efficiency of the device, and effectively improve the overall reliability of the device.

[0033] like Figure 1 and Figure 6 As shown, the side wall of the storage box 4 is fixedly connected with an exhaust pipe 71; the storage box 4 and the exhaust pipe 71 are communicated with each other; the end of the exhaust pipe 71 away from the storage box 4 is used in conjunction with a sealing plug 7; when working, the exhaust gas treatment equipment can be connected to the exhaust pipe 71, and then the exhaust gas treatment equipment can be started to achieve the purpose of treating the exhaust gas. When the exhaust gas needs to be stored, the sealing plug 7 can be inserted into the exhaust pipe 71 to seal it, so as to achieve the purpose of storing the exhaust gas; the arrangement of the sealing plug 7 and the exhaust pipe 71 can make the treatment of the exhaust gas safer, faster and more convenient.

[0034] Working principle: When working, first place the material to be cooled above the filter 17, then inject a certain amount of liquid nitrogen into the placement component, then start the power of the motor 11 to drive the screw 13 to start rotating, and then the screw 13 will drive the limit block 15 to move through the screw nut pair, and then the limit block 15 will drive the connecting rod 14, the fixed rod 16, and the filter 17 to move up and down in turn, and then when the filter 17 enters the placement component and the material is completely soaked in liquid nitrogen, the power of the motor 11 can be turned off, and then the hatch of the freezer 1 can be closed. To achieve the purpose of freezing the material, if the material needs to be kept warm continuously, the pre-prepared liquid nitrogen can be injected from the first delivery pipe 21. At this time, the liquid nitrogen will be transported to the inside of the delivery trough 23 through the first delivery pipe 21, and then discharged into the inside of the storage cylinder 2 from the multiple discharge holes 22. The liquid nitrogen can be continuously replenished through the first delivery pipe 21, thereby achieving the purpose of continuously freezing the material at a low temperature. When the gaseous nitrogen needs to be discharged, the power supply of the air pump 33 can be started. At this time, the air pump 33 will suck out the gaseous nitrogen inside the freezing box 1 through the second delivery pipe 3 to achieve the purpose of discharging the gaseous nitrogen. At this time, the power of the heating wire 31 can be turned on to continuously heat the inner wall of the second delivery pipe 3 to achieve the purpose of reducing crystallization caused by temperature difference. When the air pump 33 extracts the gaseous nitrogen inside the freezing box 1, the gaseous nitrogen will be discharged into the fourth delivery pipe 42 through the third delivery pipe 41 and then discharged into the storage box 4. At this time, the gaseous nitrogen will be adsorbed from bottom to top by different adsorption carbon plates 44 to achieve the purpose of storing and filtering the gaseous nitrogen. When the gaseous nitrogen is discharged into the storage box 4 through the fourth delivery pipe 42, it will first be discharged into the deflector 5. At this time, the gaseous nitrogen will be discharged into the deflector 5 first. The liquid nitrogen will pass through the guide groove 51 and the gas outlet 52 in sequence and then be discharged into the storage box 4 to achieve the purpose of guiding the gaseous nitrogen. When the liquid nitrogen flows out of the discharge hole 22, the guide plate 6 will guide it. At the same time, the guide plate 6 will reduce the liquid nitrogen from flowing back into the discharge hole 22 to achieve the purpose of guiding and preventing the liquid nitrogen from flowing back. The exhaust gas treatment equipment can be connected to the exhaust pipe 71, and then the exhaust gas treatment equipment can be started to achieve the purpose of treating the exhaust gas. When the exhaust gas needs to be stored, the sealing plug 7 can be inserted into the exhaust pipe 71 to seal it to achieve the purpose of storing the exhaust gas.

[0035] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A liquid nitrogen quick freezing device with automatic temperature control function, comprising a freezing chamber (1); characterized in that: The top of the freezer (1) is fixedly connected to a motor (11); the inner side wall of the freezer (1) is fixedly connected to a limit plate (12); the output end of the motor (11) is fixedly connected to a screw rod (13); the screw rod (13) is connected to a limit block (15) through a screw nut pair; the side wall of the limit block (15) is fixedly connected to a connecting rod (14); the bottom of the connecting rod (14) is fixedly connected to a pair of fixing rods (16); the pair of fixing rods (16) are symmetrically arranged; the ends of the pair of fixing rods (16) are fixedly connected to the same filter (17); a placement component is provided inside the freezer (1); and an exhaust component is provided on the top of the freezer (1).

2. The liquid nitrogen quick freezing device with automatic temperature control function according to claim 1, characterized in that: The placement assembly comprises a storage cylinder (2); the storage cylinder (2) is fixedly connected to the bottom of the inner wall of the freezer (1); a conveying groove (23) is provided in the middle of the storage cylinder (2); a plurality of discharge holes (22) are provided on the inner wall of the storage cylinder (2); the discharge holes (22) and the conveying groove (23) are communicated with each other; a first conveying pipe (21) is fixedly connected to the top of the storage cylinder (2), and the first conveying pipe (21) passes through the side wall of the freezer (1); the conveying groove (23) and the first conveying pipe (21) are communicated with each other.

3. The liquid nitrogen quick freezing device with automatic temperature control function according to claim 2, characterized in that: The exhaust assembly includes a second delivery pipe (3); the freezer (1) and the second delivery pipe (3) are connected to each other; a fixing bracket (32) is fixedly connected to the inner side wall of the end of the second delivery pipe (3) away from the freezer (1); a heating wire (31) is fixedly connected to the top of the fixing bracket (32); and an air pump (33) is connected to the end of the second delivery pipe (3) close to the fixing bracket (32).

4. The liquid nitrogen quick freezing device with automatic temperature control function according to claim 3, characterized in that: The output end of the air pump (33) is fixedly connected to a third delivery pipe (41); the end of the third delivery pipe (41) is fixedly connected to a storage box (4); a fourth delivery pipe (42) is fixedly connected to the inner wall of the storage box (4) near the third delivery pipe (41); the third delivery pipe (41) and the fourth delivery pipe (42) are communicated with each other; a plurality of fixed blocks (43) are fixedly connected to the inner wall of the storage box (4) and are symmetrically arranged; an adsorption carbon plate (44) is installed on the top of the fixed block (43).

5. The liquid nitrogen quick freezing device with automatic temperature control function according to claim 4, characterized in that: The end of the fourth delivery pipe (42) is fixedly connected to a flow guide cover (5); a flow guide groove (51) is provided inside the flow guide cover (5); a plurality of air outlets (52) are provided on the top of the flow guide cover (5); the flow guide groove (51) and the air outlets (52) are communicated with each other; and the flow guide cover (5) and the fourth delivery pipe (42) are communicated with each other.

6. The liquid nitrogen quick freezing device with automatic temperature control function according to claim 5, characterized in that: A guide plate (6) is fixedly connected to a position of the inner side wall of the storage cylinder (2) close to the discharge hole (22); the guide plate (6) is arranged at an angle.

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