Turnover liquid nitrogen tank cover and liquid nitrogen tank

Abstract

The embodiment of the present application provides a turned-over liquid nitrogen tank cover and liquid nitrogen tank, and relates to the technical field of cryopreservation equipment. It aims to improve the problem that the liquid nitrogen tank cover is inconvenient to open and close and inconvenient to observe. It comprises an outer cover, an inner cover and a sensor. The outer cover comprises a cover body, an exhaust fan and a pressing plate. A communication hole is arranged between the inner wall and the outer wall of the cover body, and an exhaust passage is communicated with the outside. The pressing plate is used to move downward under the action of external pressure to make the exhaust passage conductive, or the pressing plate is used to move upward after reset to block the exhaust passage. The inner cover is rotatably arranged in the middle of the cover body. The inner cover is used to close or open the hole in the process of rotation, and to separate or press the pressing plate. The opening and closing of the hole in the cover body are controlled by the sensor. The rotation of the inner cover realizes the conduction or blocking of the exhaust passage, so as to realize the removal of white mist and the closing of the hole. The degree of automation and efficiency are high, and the use efficiency of the liquid nitrogen tank can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cryopreservation equipment, in particular to a liquid nitrogen tank cover and a liquid nitrogen tank. BACKGROUND

[0002] Liquid nitrogen is a colorless, odorless, non-corrosive and inert gas, which is a common refrigerant in industry and plays an important role in many fields such as medical treatment. In the transportation and storage of liquid nitrogen, liquid nitrogen tanks are often used for carrying. However, there are still some problems in the use of the liquid nitrogen tank body so far: 1. When the liquid nitrogen tank is opened, the water vapor in the air will instantly condense into fine ice particles due to the large temperature difference between the liquid nitrogen and the surrounding environment under normal circumstances, which looks like "white fog". The "white fog" will block the view of the operator, affecting observation and use. 2. The liquid nitrogen tank cover has low automation, and the medical staff will be inconvenient when using it. 3. If the cover is not closed in time after the liquid nitrogen tank is used, it will cause waste of liquid nitrogen evaporation. SUMMARY

[0003] The purpose of the present application includes, for example, providing a liquid nitrogen tank cover which can improve the problem of inconvenient opening and closing of the liquid nitrogen tank cover.

[0004] The purpose of the present application also includes providing a liquid nitrogen tank which can improve the problem of inconvenient opening and closing of the liquid nitrogen tank cover.

[0005] The embodiments of the present application can be implemented as follows:

[0006] The embodiments of the present application provide a liquid nitrogen tank cover which is used for cooperating with a liquid nitrogen tank body. The liquid nitrogen tank cover comprises an outer cover, an inner cover and a sensor. The outer cover comprises a cover body, an exhaust fan and a pressing plate. A through hole is formed in the middle of the cover body. An exhaust passage is arranged between the inner wall and the outer wall of the cover body and communicates with the through hole and the outside. An outer thread is arranged at the bottom end of the cover body for threadedly connecting with the liquid nitrogen tank body. The pressing plate is elastically arranged in the exhaust passage in the height direction. The pressing plate is used for moving downward under the action of external pressure to make the exhaust passage conductive, or the pressing plate is used for moving upward after reset to block the exhaust passage. The exhaust fan is fixed in the exhaust passage and is used for exhausting air outside the exhaust passage. The inner cover is rotatably arranged in the middle of the cover body. The inner cover is used for closing or opening the through hole in the process of rotation, and is used for separating or pressing the pressing plate. The sensor is fixed on the surface of the cover body. The sensor is electrically connected with the inner cover, and is used for electrically controlling the rotation of the inner cover.

[0007] In addition, the liquid nitrogen tank cover provided by the embodiments of the present application can also have the following additional technical features:

[0008] Optionally, the inner cover comprises a plurality of flip pieces; the plurality of flip pieces are arranged at the top end of the through hole in the circumferential direction of the cover body, and each flip piece is rotatably connected to the cover body; the plurality of flip pieces are used to separate from the pressing plate and close the through hole, or move away from each other to open the through hole and press against the pressing plate during rotation.

[0009] Optionally, the inner cover further comprises a plurality of motors and a plurality of connecting rods; the plurality of motors, the plurality of connecting rods and the plurality of flip pieces are connected one by one; the motor is fixed on the cover body, one end of the connecting rod is fixed with the flip piece, and the other end of the connecting rod is rotatably connected with the motor; the motor is used to drive the flip piece to rotate.

[0010] Optionally, the top end of the pressing plate protrudes or extends into the surface of the cover body; the surface of each flip piece is fixed with a curved convex, which is used to press against or separate from the pressing plate during the flipping of the flip piece.

[0011] Optionally, the outer cover further comprises a plurality of sliding pieces; the plurality of sliding pieces are arranged on the cover body in the circumferential direction of the cover body and located outside the inner cover; the sliding piece is slidingly connected with the cover body, and the sliding piece is used to be inserted or separated from the inner cover during the sliding of the sliding piece relative to the cover body; the sliding piece is electrically connected with the inductor, and the sliding of the sliding piece is controlled by the inductor.

[0012] Optionally, the number of exhaust channels is a plurality; the plurality of exhaust channels are arranged in the circumferential direction of the cover body at intervals; the flipped liquid nitrogen tank cover further comprises a plurality of springs; each spring is fixed in the exhaust channel;

[0013] The number of pressing plates is a plurality; each pressing plate is arranged in the exhaust channel and located outside the sliding piece; the bottom end of the pressing plate is connected with the spring, and the top end of the pressing plate is exposed on the surface of the cover body; the top end of the pressing plate is used to press against or separate from the flip piece during rotation.

[0014] Optionally, each exhaust channel comprises an air inlet, an exhaust air slot and an exhaust outlet arranged in the radial direction of the cover body in sequence and in communication; the spring is fixed in the exhaust air slot, and the pressing plate is accommodated in the exhaust air slot; the pressing plate is provided with a gap, which is used to communicate with the air inlet and the exhaust outlet under the action of external pressure on the pressing plate, or to be misaligned with the air inlet and the exhaust outlet to block the exhaust after the pressing plate is reset.

[0015] Optionally, the number of the exhaust fans is multiple; the multiple exhaust fans are arranged along the circumference of the cover body and fixed between the exhaust air chute and the exhaust port.

[0016] Optionally, the turned-over liquid nitrogen tank cover further comprises multiple pressure sensors; each pressure sensor is arranged at the bottom of the pressing plate and used to detect the pressure of the pressing plate; the exhaust fan is electrically connected with the pressure sensor; the pressure sensor is used to control the exhaust fan to start when the pressure of the pressing plate is detected.

[0017] The embodiment of the present application further provides a liquid nitrogen tank. The liquid nitrogen tank comprises a liquid nitrogen tank body and a turned-over liquid nitrogen tank cover; the inner side of the top of the liquid nitrogen tank body is provided with an internal thread which is used to be screwed with the external thread of the cover body.

[0018] The turned-over liquid nitrogen tank cover and the liquid nitrogen tank of the embodiment of the present application have the following advantages, for example:

[0019] The turned-over liquid nitrogen tank cover comprises an outer cover, an inner cover and a sensor; the outer cover comprises a cover body, an exhaust fan and a pressing plate; the middle part of the cover body is provided with a through hole; the inner wall and the outer wall of the cover body are provided with an exhaust passage which is connected with the through hole and the outside; the bottom end of the cover body is provided with an external thread which is used to be screwed with the liquid nitrogen tank body; the pressing plate is elastically arranged in the exhaust passage along the height direction; the pressing plate is used to move downward to make the exhaust passage conductive under the action of the external pressure or to move upward to block the exhaust passage after reset; the exhaust fan is fixed in the exhaust passage and used to exhaust air outside the exhaust passage; the inner cover is rotatably arranged in the middle part of the cover body and used to close or open the through hole and to separate or press the pressing plate during rotation; the sensor is fixed on the surface of the cover body and electrically connected with the inner cover; the sensor is used to electrically control the rotation of the inner cover.

[0020] The opening and closing of the through hole of the cover body are controlled by the sensor; the pressing plate is used to make the exhaust passage conductive or blocked by the rotation of the inner cover to remove the white mist and close the through hole. The turned-over liquid nitrogen tank cover can avoid being easily opened by non-workers and the white mist generated when the liquid nitrogen tank is opened is quickly removed, so that the operator is not disturbed by the white mist, the degree of automation and efficiency are high, and the use efficiency of the liquid nitrogen tank can be improved.

[0021] The liquid nitrogen tank comprising the turned-over liquid nitrogen tank cover can improve the inconvenience of opening and closing the cover body of the liquid nitrogen tank and the inconvenience of observation. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope. Other related drawings can also be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0023] Figure 1 The overall schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0024] Figure 2 The chute layer schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0025] Figure 3 The working schematic diagram of the sliding piece of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0026] Figure 4 The cross-sectional view of the defogging layer of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0027] Figure 5 The turning-over piece schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0028] Figure 6 The outer cover cross-sectional view of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0029] Figure 7 The sliding piece schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0030] Figure 8 The pressing plate schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment;

[0031] Figure 9 The barrier schematic diagram of the turned-over liquid nitrogen tank cover provided in the present embodiment.

[0032] Figure: 1-liquid nitrogen tank body; 2-cover body; 21-outer cover; 210-stop plate; 211-chute layer; 2111-chute; 2112-sliding piece; 2113-pressing plate; 212-defogging layer; 2121-barrier; 2122-spring; 2123-pressure sensor; 2124-second motor; 2125-exhaust fan; 2126-air inlet; 2127-air outlet; 22-inductor; 23-inner cover; 231-first motor; 232-connecting rod; 233-turning-over piece; 2331-curved convex. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Generally, the components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents the selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0039] The following will be described in combination with Figures 1 to 9 The flipped liquid nitrogen tank cover provided by the present embodiment is described in detail.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The embodiment of the present application provides a turned-over liquid nitrogen tank cover used in cooperation with a liquid nitrogen tank body 1, the turned-over liquid nitrogen tank cover comprising an outer cover 21, an inner cover 23 and an inductor 22, the outer cover 21 comprising a cover body 2, an exhaust fan 2125 and a pressing plate 2113; a through hole is formed in the middle part of the cover body 2, an exhaust passage is arranged between the inner wall and the outer wall of the cover body 2 and communicates with the through hole and the outside, and an external thread is arranged at the bottom end of the cover body 2 and used for threadedly connecting with the liquid nitrogen tank body 1; the pressing plate 2113 is elastically arranged in the exhaust passage along the height direction, and is used for moving downward to make the exhaust passage conductive under the action of external pressure or moving upward to block the exhaust passage after resetting; the exhaust fan 2125 is fixed in the exhaust passage and is used for exhausting air outside the exhaust passage; the inner cover 23 is rotatably arranged in the middle part of the cover body 2, and is used for closing or opening the through hole and pressing or separating from the pressing plate 2113 in the process of rotation; and the inductor 22 is fixed on the surface of the cover body 2 and electrically connected with the inner cover 23, and is used for electrically controlling the rotation of the inner cover 23.

[0041] The cover body 2 is connected with the liquid nitrogen tank body 1 through the external thread, and the through hole on the cover body 2 is used for opening or closing the liquid nitrogen tank body 1. In the initial state, the turned-over liquid nitrogen tank cover is threadedly connected with the liquid nitrogen tank body 1 through the external thread, the inner cover 23 closes the through hole and closes the cover body 2; the operator is first sensed and recognized by the inductor 22, then the inner cover 23 is controlled to rotate and open, then the inner cover 23 presses the pressing plate 2113, the exhaust passage is communicated, the exhaust fan 2125 is opened, the white mist generated after the through hole of the cover body 2 is opened is exhausted, and the defogging work is completed. After the use of the liquid nitrogen tank body 1 is completed, the inductor 22 senses that the operator opens, then the inner cover 23 is controlled to rotate and close the through hole, the inner cover 23 separates from the pressing plate 2113, the pressing plate 2113 is reset, then the pressing plate 2113 blocks the exhaust passage, and the through hole on the cover body 2 and the exhaust passage are all closed. The inductor 22 can identify the user, and the turned-over liquid nitrogen tank cover can be opened by the non-staff member. The turned-over liquid nitrogen tank cover can quickly open the cover body 2, can automatically close after use, and can avoid the volatilization of liquid nitrogen. The exhaust air duct and the pressing plate 2113 are arranged, the white mist generated when the liquid nitrogen tank is opened is quickly removed, and the operator is not disturbed by the white mist. The degree of automation and efficiency are high, and the use efficiency of the liquid nitrogen tank can be improved.

[0042] The liquid nitrogen tank body 1 is a hollow cylindrical shape and is used for containing liquid nitrogen. The liquid nitrogen tank cover is a whole cylindrical shape, is arranged above the liquid nitrogen tank body 1, and is used for closing the liquid nitrogen tank body 1, so that the content is stored. The cover body 2 is a circular ring shape, the inside is provided with a through hole to be hollow, an external thread is arranged on the sidewall of the bottom outer end, is matched with the internal thread of the liquid nitrogen tank body 1, and is arranged above the liquid nitrogen tank body 1 through the thread.

[0043] The cover 2 comprises a baffle 210, a chute layer 211 and a defogging layer 212. The baffle 210 is annular. In the interior of the cover 2, the upper part of the baffle 210 is the chute layer 211, and the lower part of the baffle 210 is the defogging layer 212. The inductor 22 is fixed on the top surface of the cover 2. The inductor 22 can receive an instruction of opening the cover 2 from a user by means such as fingerprint recognition, and then control the inner cover 23 to rotate.

[0044] With reference to Figure 1 , Figure 2 、 Figure 5 In this embodiment, the inner cover 23 comprises a plurality of flip pieces 233. The plurality of flip pieces 233 are arranged at the top end of the through hole along the circumference of the cover 2. Each flip piece 233 is rotatably connected to the cover 2. The plurality of flip pieces 233 are used to separate from the pressing plate 2113 and close the through hole during rotation, or move away from each other to open the through hole and press against the pressing plate 2113.

[0045] The plurality of flip pieces 233 gather to form a circle. Specifically, the shape of the flip piece 233 is a sector, and the number is four. The plurality of flip pieces 233 rotate upward to open the through hole, and continue to rotate to press the pressing plate 2113 backward. The plurality of flip pieces 233 rotate downward to separate from the pressing plate 2113, the pressing plate 2113 resets, and the plurality of flip pieces 233 can gather until the through hole is closed.

[0046] With reference to Figure 2 and Figure 5 In this embodiment, the inner cover 23 further comprises a plurality of motors and a plurality of connecting rods 232. The plurality of motors, the plurality of connecting rods 232 and the plurality of flip pieces 233 are connected one by one. The motor is fixed on the cover 2. One end of the connecting rod 232 is fixed with the flip piece 233, and the other end of the connecting rod 232 is rotatably connected with the motor. The motor is used to drive the flip piece 233 to rotate.

[0047] The plurality of motors are arranged at intervals along the circumference, and the plurality of connecting rods 232 are arranged at intervals along the circumference and radially. The motor drives the connecting rod 232 to drive the flip piece 233 to rotate upward and downward.

[0048] The inner cover 23 is movably arranged at the through hole of the cover body 2 by the following first motor 231 and connecting rod 232. The first motor 231 is annularly and equidistantly arranged on the baffle 210, close to the through hole of the outer cover 21, and drives the connecting rod 232 to rotate by forward rotation or reverse rotation of the first motor 231; the first motor 231 has a rotation range of 0°-180°, so as to ensure that the turnover piece 233 is in a horizontal state. The connecting rod 232 is in the shape of "U" and has four connecting rods, one end of which is movably arranged on the driving end of the first motor 231 through a rotating shaft, and the other end is fixedly arranged with the turnover piece 233; the turnover piece 233 is fixedly arranged at one end of the connecting rod 232 and at the through hole of the cover body 2, and forms a complete circle under the control of the first motor 231, so as to block the through hole of the outer cover 21 and isolate the liquid nitrogen tank body 1 from the outside. The turnover piece 233 is made of special rubber and can maintain elasticity at low temperature, so as to ensure the sealing performance after the turnover piece 233 is combined.

[0049] With reference to Figure 2 and Figure 5 In the embodiment, the top end of the pressing plate 2113 protrudes or enters the surface of the cover body 2; the surface of each turnover piece 233 is fixedly provided with an arc convex 2331, which is used for abutting against or separating from the pressing plate 2113 in the process of turning over of the turnover piece 233.

[0050] The turnover piece 233 is provided with the arc convex 2331 on the upper surface thereof; when the arc convex 2331 on the surface of the turnover piece 233 turns to below the turnover piece 233 after the turnover piece 233 is turned over, the arc convex 2331 abuts against the pressing plate 2113, continues to rotate and extrudes the pressing plate 2113, so as to move the pressing plate 2113 downward along the axial direction of the cover body 2, thereby opening the exhaust passage and removing white mist.

[0051] With reference to Figure 3 , Figure 5 and Figure 7 In the embodiment, the outer cover 21 further comprises a plurality of sliding pieces 2112; the plurality of sliding pieces 2112 are arranged on the cover body 2 in a circumferential direction of the cover body 2 and are located at the outer periphery of the inner cover 23; the sliding piece 2112 is slidably connected with the cover body 2, and is used for plugging or separating from the inner cover 23 in the process of sliding relative to the cover body 2; the sliding piece 2112 is electrically connected with the inductor 22, and is slid by electric control of the inductor 22.

[0052] In other embodiments, an electromagnet can be arranged on the cover body 2, and a magnet is arranged on the sliding piece 2112; the sliding of the sliding piece 2112 relative to the cover body 2 is realized by on-off electricity of the electromagnet and repulsion and attraction of the magnet, and the on-off electricity of the electromagnet is electrically controlled by the inductor 22.

[0053] The sliding piece 2112 is radially slidably arranged on the cover body 2, the sliding piece 2112 is inserted with the turnover piece 233, the turnover piece 233 cannot rotate, the sliding piece 2112 is separated from the turnover piece 233, and the turnover piece 233 can rotate. In the initial state, the turnover piece 233 is located in the horizontal direction, the sliding piece 2112 is inserted with the turnover piece 233, and the turnover piece 233 closes the through hole; when the through hole needs to be opened, the sliding piece 2112 is driven to move away from the turnover piece 233 along the radial direction, the sliding piece 2112 is separated from the turnover piece 233, the first motor 231 drives the turnover piece 233 to rotate, and the through hole is opened. The process of closing the through hole is opposite, when the turnover piece 233 closes the through hole, the sliding piece 2112 is driven to move close to the turnover piece 233 along the radial direction, is clamped with the turnover piece 233, and the turnover piece 233 is fixed.

[0054] The turnover piece 233 is fan-shaped, and a groove is arranged on an arc-shaped outer side surface of the turnover piece 233, which can be inserted with or separated from a protrusion of the sliding piece 2112. The center of the turnover piece 233 is at the same horizontal height as the center of the sliding piece 2112.

[0055] The baffle 210 is provided with a sliding groove 2111, the number of the sliding groove 2111 is four, and the sliding groove 2111 is annularly and equidistantly arranged on the upper surface of the baffle 210 around the central axis of the outer cover 21. The sliding piece 2112 is “C”-shaped, the bottom surface of the sliding piece 2112 is provided with a sliding block, the number of the sliding piece 2112 is four, the sliding block of the sliding piece 2112 is embedded in each sliding groove 2111, the sliding piece 2112 can be driven by means such as electric control to move along the sliding groove 2111, so that the sliding piece 2112 is in contact with or separated from the turnover piece 233, and the sliding groove 2111 is arranged along the radial direction of the cover body 2. The sliding piece 2112 is provided with a protrusion at one end facing the turnover piece 233, and the protrusion can be inserted with the groove of the turnover piece 233.

[0056] Referring to Figure 1 , Figure 2 , Figure 4 and Figure 6 , in the embodiment, the number of the air exhaust channels is multiple; the multiple air exhaust channels are arranged at intervals along the circumference of the cover body 2; the turned-over liquid nitrogen tank cover further comprises multiple springs 2122; each spring 2122 is fixed in the air exhaust channel; the number of the pressing plates 2113 is multiple; each pressing plate 2113 is arranged in the air exhaust channel and located at the outer periphery of the sliding piece 2112; the bottom end of the pressing plate 2113 is connected with the spring 2122, the top end of the pressing plate 2113 is exposed on the surface of the cover body 2, and the top end of the pressing plate 2113 is used for abutting against or separating from the turnover piece 233 in the rotating process.

[0057] The pressing plates 2113 are arc-shaped, four in number, movably embedded in the air outlet channels at equal intervals around the central axis of the outer cover 21, with their upper ends located at the top surface of the outer cover 21, their middle portions penetrating through the baffle 210 and extending into the air outlet channels of the barrier 2121 described below, and their lower ends supported by the springs 2122. Each two pressing plates 2113 are separated by a sliding groove 2111. The pressing plates 2113 are used to open or close the air outlet channels during the axial movement of the cover body 2.

[0058] With reference to Figure 4 , Figure 6 and Figure 8 , in this embodiment, each air outlet channel comprises, in sequence along the radial direction of the cover body 2, an air inlet 2126, an air outlet channel and an air outlet 2127; the springs 2122 are fixed in the air outlet channels, and the pressing plates 2113 are accommodated in the air outlet channels; the pressing plates 2113 are provided with notches for communicating with the air inlets 2126 and the air outlets 2127 when the pressing plates 2113 are subjected to external pressure, or for being out of position to block the air outlets when the pressing plates 2113 are reset.

[0059] With reference to Figure 4 , Figure 6 and Figure 8 , in this embodiment, each air outlet channel comprises, in sequence along the radial direction of the cover body 2, an air inlet 2126, an air outlet channel and an air outlet 2127; the springs 2122 are fixed in the air outlet channels, and the pressing plates 2113 are accommodated in the air outlet channels; the pressing plates 2113 are provided with notches for communicating with the air inlets 2126 and the air outlets 2127 when the pressing plates 2113 are subjected to external pressure, or for being out of position to block the air outlets when the pressing plates 2113 are reset. Figure 4 Figure 9 The pressing plates 2113 are arc-shaped, four in number, movably embedded in the air outlet channels at equal intervals around the central axis of the outer cover 21, with their upper ends located at the top surface of the outer cover 21, their middle portions penetrating through the baffle 210 and extending into the air outlet channels of the barrier 2121 described below, and their lower ends supported by the springs 2122. Each two pressing plates 2113 are separated by a sliding groove 2111. The pressing plates 2113 are used to open or close the air outlet channels during the axial movement of the cover body 2.

[0060] The springs 2122 are four in number, fixed in the hollows of the barriers 2121 respectively, with their lower ends fixedly connected to the bottoms of the pressing plates 2113 and their upper ends supporting the pressing plates 2113.

[0061] Air inlet 2126, air outlet 2127, the number of eight, can be increased or decreased according to the actual situation, air inlet 2126 and air outlet 2127 are respectively arranged on the inner and outer side walls of the defogging layer 212, which are used to absorb and release white fog; Each exhaust fan 2125 corresponds to two air inlets 2126, air outlets 2127, and each exhaust fan 2125 and its corresponding two air inlets 2126, air outlets 2127 are arranged in a straight line, so as to achieve good defogging effect.

[0062] Referring to Figure 4 In this embodiment, the number of exhaust fans 2125 is multiple; The plurality of exhaust fans 2125 are arranged at intervals along the circumference of the cover body 2, and each exhaust fan 2125 is fixed between the exhaust air chute and the air outlet. The exhaust fan 2125 is used to start to remove white fog when the pressure plate 2113 opens the exhaust air chute.

[0063] Referring to Figure 4 In this embodiment, the inverted liquid nitrogen tank cover further comprises a plurality of pressure sensors 2123; Each pressure sensor 2123 is arranged at the bottom of the pressure plate 2113, and the pressure sensor 2123 is used to detect the pressure of the pressure plate 2113; The exhaust fan 2125 is electrically connected with the pressure sensor 2123; The pressure sensor 2123 is used to control the exhaust fan 2125 to start when detecting the pressure of the pressure plate 2113.

[0064] The pressure sensor 2123, the number of four, is fixedly arranged on the bottom surface of the defogging layer 212, is located in the spring 2122 on each barrier 2121 respectively, is used to sense the state of the pressure plate 2113 and the spring 2122 above it, thereby controlling the second motor 2124 to work.

[0065] The second motor 2124, the number of four, is fixedly arranged on the bottom surface of the defogging layer 212 in a ring shape at equal intervals, can control the exhaust fan 2125 to work after getting the feedback of the pressure sensor 2123; The number of exhaust fans 2125 is four, which are respectively fixedly arranged on the driving end of the second motor 2124 in a ring shape at equal intervals, and can be driven by the second motor 2124.

[0066] According to the flip liquid nitrogen tank cover provided by the embodiment, the working principle of the flip liquid nitrogen tank cover is as follows: in a normal state, the flip pieces 233 are combined into a circular surface to block the through hole of the outer cover 21, and the pressing plate 2113 is located in the arc-shaped exhaust air channel of the barrier 2121, and the notch on the pressing plate 2113 is staggered with the notch on the sidewall of the barrier 2121, so that the inside and outside of the liquid nitrogen tank are isolated; when the cover 2 of the liquid nitrogen tank is opened, the operator is first identified by the inductor 22, and then the instructions are transmitted to the sliding piece 2112 and the first motor 231; the sliding piece 2112 slides outward along the sliding groove 2111, at this time, the protrusion on the sliding piece 2112 is separated from the groove on the sidewall of the flip piece 233, and the flip piece 233 is no longer limited; then the first motor 231 starts to work, driving the flip piece 233 to rotate by 180°, at this time, the cover 2 is opened; at the same time when the cover 2 is opened, the arc surface protrusion 2331 of the flip piece 233 rotates by 180° to press the upper surface of the pressing plate 2113, so that the pressing plate 2113 compresses the spring 2122 downward along the barrier 2121, and when the pressing plate 2113 moves to the limit position, the notch on the pressing plate 2113 is aligned with the notch on the barrier 2121, so that the gas can flow through; at the same time, the pressure sensor 2123 is pressed, the second motor 2124 is controlled to drive the exhaust fan 2125 to rotate, so that the white mist is sucked into the air inlet 2126, passes through the notches on the pressing plate 2113 and the barrier 2121, and is discharged from the air outlet 2127, completing the demisting work; after the liquid nitrogen tank is used, the inductor 22 detects that the user leaves, and then transmits information to the first motor 231 and the sliding piece 2112; the first motor 231 is then reversed to drive the flip piece 233 to reset; then the sliding piece 2112 slides inward along the sliding groove 2111, at this time, the protrusion on the sliding piece 2112 is inserted into the groove of the flip piece 233 to limit it, thereby completing the closure of the cover 2.

[0067] The flip liquid nitrogen tank cover provided by the embodiment has at least the following advantages:

[0068] The opening and closing of the through hole on the cover 2 are controlled by the inductor 22, the pressing plate 2113 is rotated by the inner cover 23 to realize the conduction or blockage of the exhaust air channel, so as to realize the removal of white mist and the closing of the through hole. The white mist generated when the liquid nitrogen tank is opened can be quickly removed, so as to ensure that the operator is not disturbed by the white mist, the degree of automation and efficiency are high, and the use efficiency of the liquid nitrogen tank can be improved.

[0069] Through the cooperation of the inductor 22 and the pressure sensor 2123, the user can be identified, and the liquid nitrogen tank can be easily opened by non-workers.

[0070] Through the cooperation of the flip piece 233, the connecting rod 232 and the sliding piece 2112, the cover 2 can be quickly opened, and the cover can be automatically closed after use to avoid the volatilization of liquid nitrogen.

[0071] Through the cooperation of the exhaust fan 2125, the air inlet 2126 and the air outlet 2127, the white mist generated when the liquid nitrogen tank is opened can be quickly removed, so that the operator is not disturbed by the white mist.

[0072] The present application is simple to operate, has high automation degree and efficiency, and can improve the use efficiency of the liquid nitrogen tank.

[0073] The embodiment of the present application also provides a liquid nitrogen tank. The liquid nitrogen tank comprises a liquid nitrogen tank body 1 and a turned-over liquid nitrogen tank cover, and the inner side of the top of the liquid nitrogen tank body 1 is provided with an internal thread, which is used for threaded connection with an external thread of the cover body 2 of the liquid nitrogen tank.

[0074] The liquid nitrogen tank body 1 is a hollow cylindrical shape and is used for containing liquid nitrogen. The liquid nitrogen tank body 1 is provided with an internal thread on the inner side of the top, and a liquid nitrogen tank cover is installed at the top end. The problem that the liquid nitrogen tank cover body 2 is inconvenient to open and close and inconvenient to observe can be improved.

[0075] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flip-top lid for a liquid nitrogen tank (1), characterized in that The turned-over liquid nitrogen tank cover comprises: An outer cover (21) comprising a cover body (2), an exhaust fan (2125) and a pressing plate (2113); a through hole is formed in the middle of the cover body (2), an exhaust passage is arranged between the inner wall and the outer wall of the cover body (2) to communicate the through hole with the outside, and an external thread is arranged at the bottom end of the cover body (2) to be screwed with the liquid nitrogen tank body (1); the pressing plate (2113) is elastically arranged in the exhaust passage in the height direction, and the pressing plate (2113) is used to move downward to make the exhaust passage conductive under the action of external pressure, or the pressing plate (2113) is used to move upward to block the exhaust passage after reset; the exhaust fan (2125) is fixed in the exhaust passage, and the exhaust fan (2125) is used to exhaust air outside the exhaust passage; An inner cover (23) rotatably arranged in the middle of the cover body (2), which is used to close or open the through hole in the process of rotation, and to separate or press the pressing plate (2113), wherein the inner cover (23) comprises a plurality of turning pieces (233); a plurality of turning pieces (233) are arranged at the top end of the through hole along the circumference of the cover body (2), and each turning piece (233) is rotatably connected with the cover body (2); a plurality of turning pieces (233) are used to separate the pressing plate (2113) and close the through hole by gathering together in the process of rotation, or to open the through hole and press the pressing plate (2113) by moving away from each other; And an inductor (22) fixed on the surface of the cover body (2), the inductor (22) is electrically connected with the inner cover (23), and the inductor (22) is used to control the rotation of the inner cover (23).

2. The turned-over liquid nitrogen tank cover according to claim 1, wherein: The inner cover (23) further comprises a plurality of motors and a plurality of connecting rods (232); the plurality of motors, the plurality of connecting rods (232) and the plurality of turning pieces (233) are connected one by one; the motor is fixed on the cover body (2), one end of the connecting rod (232) is fixed with the turning piece (233), and the other end of the connecting rod (232) is rotatably connected with the motor; the motor is used to drive the turning piece (233) to rotate.

3. The turned-over liquid nitrogen tank cover according to claim 1, wherein: The top end of the pressing plate (2113) protrudes or enters the surface of the cover body (2); an arc convex (2331) is fixed on the surface of each turning piece (233), and the arc convex (2331) is used to press or separate from the pressing plate (2113) in the process of turning over the turning piece (233).

4. The turned-over liquid nitrogen tank cover according to any one of claims 1-3, wherein: The outer cover (21) further comprises a plurality of sliding pieces (2112); the plurality of sliding pieces (2112) are arranged on the cover body (2) along the circumferential direction of the cover body (2) and are located at the outer periphery of the inner cover (23); the sliding pieces (2112) are in sliding connection with the cover body (2), and the sliding pieces (2112) are used for being inserted into or separated from the inner cover (23) in the process of sliding relative to the cover body (2); the sliding pieces (2112) are electrically connected with the inductor (22), and the sliding pieces (2112) are electrically controlled to slide by the inductor (22).

5. The flip-over liquid nitrogen tank cover according to claim 4, characterized in that: The number of the air exhaust channels is multiple; the plurality of air exhaust channels are arranged at intervals along the circumferential direction of the cover body (2); the flip-over liquid nitrogen tank cover further comprises a plurality of springs (2122); each spring (2122) is fixed in the air exhaust channel; The number of the pressing plates (2113) is multiple; each pressing plate (2113) is arranged in the air exhaust channel and is located at the outer periphery of the sliding piece (2112); the bottom end of the pressing plate (2113) is connected with the spring (2122), and the top end of the pressing plate (2113) is exposed on the surface of the cover body (2); the top end of the pressing plate (2113) is used for abutting against or separating from the flip-over piece (233) in the process of rotation.

6. The flip-over liquid nitrogen tank cover according to claim 5, characterized in that: Each air exhaust channel comprises an air inlet (2126), an air exhaust groove and an air outlet (2127) which are arranged in sequence and are communicated along the radial direction of the cover body (2); the spring (2122) is fixed in the air exhaust groove, and the pressing plate (2113) is accommodated in the air exhaust groove; the pressing plate (2113) is provided with a gap, and the gap is used for being communicated with the air inlet (2126) and the air outlet (2127) under the action of external pressure on the pressing plate (2113) or being out of position to block the exhaust after the pressing plate (2113) is reset.

7. The flip-over liquid nitrogen tank cover according to claim 6, characterized in that: The number of the air exhaust fans (2125) is multiple; the plurality of air exhaust fans (2125) are arranged at intervals along the circumferential direction of the cover body (2), and each air exhaust fan (2125) is fixed between the air exhaust groove and the air outlet.

8. The flip-over liquid nitrogen tank cover according to claim 5, characterized in that: The flip-over liquid nitrogen tank cover further comprises a plurality of pressure sensors (2123); each pressure sensor (2123) is arranged at the bottom of the pressing plate (2113), and the pressure sensor (2123) is used for detecting the pressure of the pressing plate (2113); the air exhaust fan (2125) is electrically connected with the pressure sensor (2123); and the pressure sensor (2123) is used for controlling the air exhaust fan (2125) to start under the condition that the pressure of the pressing plate (2113) is detected.

9. A liquid nitrogen tank characterized by, The liquid nitrogen tank comprises a liquid nitrogen tank body (1) and the flip-over liquid nitrogen tank cover as claimed in any one of claims 1-8; an inner thread is arranged on the inner side of the top of the liquid nitrogen tank body (1), and the inner thread is used for thread connection with the outer thread of the cover body (2).

Images