Manual pressure relief device of ultralow-temperature refrigerator

Abstract

The manual pressure relief device of the ultralow-temperature refrigerator comprises a one-way valve and a vent pipe, the one-way valve comprises a valve seat, a valve element is nested in a valve port of the valve seat in a sliding mode, a sealing protruding part attached to the valve port is arranged on the valve element, and a first spring enabling the sealing protruding part of the valve element and the valve port to be kept attached and sealed is further arranged in the valve seat; the air inlet end of the vent pipe is fixedly embedded in the air outlet end of the one-way valve, the tail end of the valve element penetrates through the valve seat and the vent pipe, the tail end of the valve element is fixedly connected with a baffle, and the baffle covers an air outlet of the vent pipe; the starting end of the valve element penetrates through the valve port and extends into the air inlet of the valve seat. A heater is fixedly arranged on the outer wall of the vent pipe; the air inlet end of the one-way valve is provided with a button used for extruding the valve element to conduct the one-way valve. The internal temperature of the refrigerator is prevented from being affected, and the condensation phenomenon in the pressure relief device can be effectively prevented; the structure is simple, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerator pressure relief, in particular to a manual pressure relief device for an ultra-low temperature refrigerator. Background Art

[0002] Ultra-low temperature refrigerators are also called ultra-low temperature storage boxes, ultra-low temperature freezers, and ultra-low temperature storage boxes. Ultra-low temperature refrigerators are essential instruments in biochemistry and molecular biology laboratories, and are mainly used to store biological samples or drugs. The temperature range of ultra-low temperature refrigerators is roughly from -60℃ to -150℃. Ultra-low temperature refrigerators have a wide range of applications, such as in biological research, metal processing, hospitals, epidemic prevention systems, and military industry.

[0003] Since the temperature inside the ultra-low temperature refrigerator is very low (≤-86℃), during the cooling process, the temperature inside the box drops and the air inside the box shrinks, which will cause a huge negative difference inside the equipment, which may cause the door to be unable to open, affecting the normal use of users;

[0004] Patent publication number CN215370987U discloses a manual pressure relief device for ultra-low temperature equipment, including a shell assembly formed by combining shell one and shell two; a one-way valve mechanism is arranged in the shell assembly; a driving structure for controlling the conduction of the one-way valve mechanism is arranged at one end of the shell assembly; the other end of the shell assembly is connected to a ventilation pipe, a heating sleeve is arranged on the outside of the ventilation pipe, a heater is arranged in the heating sleeve, the heater heats the ventilation pipe to prevent it from freezing or icing, but because the ventilation pipe is always connected to the inside of the low-temperature box of the low-temperature equipment, there is a heat exchange between the heater and the low-temperature equipment, which not only affects the internal temperature of the refrigerator, but also makes the pressure relief device prone to condensation. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a manual pressure relief device for an ultra-low temperature refrigerator, which blocks the heat exchange between the heater and the ultra-low temperature refrigerator to avoid affecting the internal temperature of the refrigerator and can also effectively prevent condensation from occurring inside the pressure relief device; the pressure relief device has a simple structure, is easy to operate, and has a fast pressure relief speed, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a manual pressure relief device for an ultra-low temperature refrigerator, comprising a one-way valve and an air vent, the one-way valve comprising a valve seat, a valve port is provided between the air inlet and the air outlet of the valve seat, a valve core is slidably nested in the valve port, a sealing protrusion is provided on the valve core that fits the valve port, and a spring is further provided in the valve seat to keep the sealing protrusion of the valve core and the valve port in a close fit and seal; the air inlet end of the air vent is fixedly nested in the air outlet end of the one-way valve, the end of the valve core passes through the valve seat and the air vent, and the end of the valve core is fixedly connected to a baffle, and the baffle covers the air outlet of the air vent; the starting end of the valve core passes through the valve port and extends into the air inlet of the valve seat; a heater is fixedly provided on the outer wall of the air vent; and a button for squeezing the valve core to make the one-way valve conductive is provided at the air inlet end of the one-way valve.

[0007] Furthermore, an extrusion head is provided at the starting end of the valve core, and the extrusion head is a stepped shaft-like structure, and a connecting hole compatible with the starting end structure of the valve core is opened on the convex shaft with a smaller outer diameter of the extrusion head. The extrusion head is fixedly nested in the starting end of the valve core through the connecting hole, and the convex shaft with a larger outer diameter of the extrusion head is located outside the air inlet of the valve seat.

[0008] Furthermore, the convex shaft with a smaller outer diameter of the extrusion head is gap-matched with the circumferential inner wall of the air inlet end of the valve seat, and an air hole connected to the external environment is opened on the circumferential outer wall of the air inlet end of the valve seat, and the air hole is connected to the air inlet of the valve seat.

[0009] Furthermore, the sealing protrusion of the valve core is a truncated cone structure, and the structures of the valve port and the sealing protrusion are adapted to each other; a low-temperature sealing gasket is also provided at the joint between the sealing protrusion and the valve port.

[0010] Furthermore, the valve core and the sealing protrusion are both provided with venting grooves on the circumferential outer walls at the valve opening.

[0011] Furthermore, a tightening shaft is provided at one end of the button facing the one-way valve, a second spring is sleeved on the outer wall of the tightening shaft, and a limiting protrusion is provided on the circumferential outer wall of the button end facing the one-way valve.

[0012] Furthermore, a flange ring is provided on the valve seat, and an outward-turned folded edge is provided on the air outlet end of the air permeable tube.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the manual pressure relief device of the ultra-low temperature refrigerator seals the air vent through a baffle provided on the valve core after the pressure relief device returns to a closed state, thereby blocking heat exchange between the heater and the ultra-low temperature refrigerator, avoiding affecting the internal temperature of the refrigerator, and effectively preventing condensation from occurring inside the pressure relief device; the pressure relief device has a simple structure, is easy to operate, and has a fast pressure relief speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a partial enlarged view of the one-way valve of the utility model;

[0016] Figure 3 This is a schematic diagram of the valve core structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the pressure relief device of the utility model in a closed state;

[0018] Figure 5 It is a schematic diagram of the structure of the pressure relief device of the utility model in the pressure relief state.

[0019] In the figure: 1. one-way valve; 11. valve seat; 12. valve core; 121. sealing protrusion; 122. baffle; 123. venting groove; 124. low-temperature sealing gasket; 13. spring 1; 14. extrusion head; 15. air vent; 16. flange ring; 2. air vent; 21. folded edge; 3. button; 31. tightening shaft; 32. spring 2; 33. limiting protrusion; 4. heater; 500. refrigerator door; 600. warehouse body; 601. groove; 602. limiting groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0021] See also Figure 1-5The utility model provides a technical solution: a manual pressure relief device for an ultra-low temperature refrigerator, comprising a one-way valve 1 and a vent pipe 2, the one-way valve 1 comprising a valve seat 11, a valve port is arranged between the air inlet and the air outlet of the valve seat 11, a valve core 12 is slidably nested in the valve port, a sealing protrusion 121 which fits with the valve port is arranged on the valve core 12, a low-temperature sealing pad 124 is also arranged at the fitting position of the sealing protrusion 121 and the valve port, a spring 13 which keeps the sealing protrusion 121 of the valve core 12 and the valve port in a fitting and sealing manner is also arranged in the valve seat 11; the air inlet end of the vent pipe 2 is fixedly nested in the air outlet end of the one-way valve 1, the end of the valve core 12 passes through the valve seat 11 and the vent pipe 2, and the end of the valve core 12 is fixedly connected with a baffle 122, and the baffle 122 covers the vent pipe 2; the starting end of the valve core 12 passes through the valve port and extends into the air inlet of the valve seat 11; the starting end of the valve core 12 is provided with an extrusion head 14, which is a stepped shaft structure, and a connecting hole adapted to the starting end structure of the valve core 12 is opened on the convex shaft with a smaller outer diameter of the extrusion head 14, and the extrusion head 14 is fixedly nested at the starting end of the valve core 12 through the connecting hole, and the convex shaft with a larger outer diameter of the extrusion head 14 is located outside the air inlet of the valve seat 11; the convex shaft with a smaller outer diameter of the extrusion head 14 is gap-matched with the circumferential inner wall of the air inlet end of the valve seat 11, and an air vent 15 connected to the external environment is opened on the circumferential outer wall of the air inlet end of the valve seat 11, and the air vent 15 is connected to the air inlet of the valve seat 11; a heater 4 is fixedly provided on the outer wall of the air vent pipe 2;

[0022] The inlet end of the one-way valve 1 is provided with a button 3 for squeezing the valve core 12 to make the one-way valve 1 conductive; the end of the button 3 facing the one-way valve 1 is provided with a tightening shaft 31, and a spring 32 is sleeved on the outer wall of the tightening shaft 31, and a limiting protrusion 33 is provided on the circumferential outer wall of the end of the button 3 facing the one-way valve 1; the valve seat 11 is provided with a flange ring 16, and the outlet end of the air vent pipe 2 is provided with an outward-turned folded edge 21;

[0023] The diameter of the air inlet of the valve seat 11 is smaller than the diameter of the valve port, the spring 13 is nested on the valve core 12, and the two ends of the spring 13 are respectively in contact with the inner side end of the air inlet of the valve seat 11 and the extrusion head 14.

[0024] Working principle:

[0025] When in use, a through hole is opened on the mounting surface of the refrigerator door 500, so that the one-way valve 1 and the air vent 2 are nested in the through hole of the refrigerator door 500, and the folded edge 21 of the air vent 2 and the flange ring 16 of the valve seat 11 are respectively fitted with the inner and outer side walls of the through hole of the refrigerator door 500, and the flange ring 16 on the valve seat 11 is fixedly connected to the refrigerator door 500 by screws;

[0026] A bin 600 for installing the button 3 is provided on the outer side of the mounting surface of the refrigerator door 500, and a groove 601 adapted to the structure of the button 3 is opened on the bin 600, and the button 3 can slide in the groove 601 toward the extrusion head 14, and the tightening shaft 31 on the button 3 passes through the bin 600 and fits with the extrusion head 14, and a limiting groove 602 slidingly matched with the limiting protrusion 33 is opened on the inner end of the groove 601, and the two ends of the spring 2 32 are respectively abutted against the inner end of the groove 601 and the button 3, and after the limiting protrusion 33 moves outward to the extreme position, it abuts against the outer end surface of the limiting groove 602 to prevent the button 3 from moving out of the groove 601; in this embodiment, the bin 600 can be a control panel provided on the refrigerator door 500, and the bin 600 is connected to the external environment.

[0027] When it is necessary to open the refrigerator door 500 of the ultra-low temperature refrigerator to take out or put items, the button 3 is pressed to make the pressing shaft 31 press the squeezing head 14 to move inward, and the squeezing head 14 drives the valve core 12 to overcome the elastic force of the spring 13 and move toward the air outlet. The sealing protrusion 121 of the valve core 12 and the low-temperature sealing gasket 124 are separated from the valve port, so that the one-way valve 1 is in a conducting state, and at the same time, the baffle 122 releases the seal on the air outlet of the air vent 2. At this time, the one-way valve 1 and the air vent 2 are connected, and the air vent 2 is connected to the inside of the ultra-low temperature refrigerator, so that the pressure relief device is in a conducting state, and the outside air enters the ultra-low temperature refrigerator through the air vent 15, the valve port and the air vent 2, so that the internal and external pressures of the ultra-low temperature refrigerator reach a balanced state, so that the refrigerator door 500 can be easily opened;

[0028] After the internal and external pressures of the ultra-low temperature refrigerator reach a balanced state, the button 3 is released, and the elastic force applied to the button 3 by the spring 2 32 drives the tightening shaft 31 to return to its original state, and the sealing protrusion 121 of the valve core 12 is kept in close contact and sealed with the valve port by the elastic force of the spring 1 13, so that the one-way valve 1 is restored to a closed state, and at the same time, the baffle 122 is in close contact and sealed with the air outlet of the air pipe 2, so that the pressure relief device is restored to a closed state, and when the items are taken and placed, the refrigerator door 500 is closed, and the heater 4 heats the air pipe 2 to prevent the air pipe 2 from freezing or icing. Since the baffle 122 is in close contact and sealed with the air outlet of the air pipe 2, the heat exchange between the heater 4 and the ultra-low temperature refrigerator is blocked, so as to avoid affecting the internal temperature of the refrigerator, and condensation inside the pressure relief device can also be effectively prevented.

[0029] Furthermore, the sealing protrusion 121 of the valve core 12 is a truncated cone structure, and the valve port is adapted to the structure of the sealing protrusion 121 .

[0030] Furthermore, the valve core 12 and the sealing protrusion 121 are both provided with a venting groove 123 on the circumferential outer wall at the valve port, so as to further increase the air inlet passage of the pressure relief device and increase the pressure relief speed.

[0031] The manual pressure relief device of the ultra-low temperature refrigerator disclosed in the present embodiment, after the pressure relief device returns to the closed state, the air vent 2 is sealed by the baffle 122 provided on the valve core 12, thereby blocking the heat exchange between the heater 4 and the ultra-low temperature refrigerator, avoiding affecting the internal temperature of the refrigerator, and effectively preventing condensation from occurring inside the pressure relief device; the pressure relief device has a simple structure, is easy to operate, and has a fast pressure relief speed.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manual pressure relief device for an ultra-low temperature refrigerator, comprising a one-way valve and a vent pipe, characterized in that: The one-way valve comprises a valve seat, a valve opening is provided between the air inlet and the air outlet of the valve seat, a valve core is slidably nested in the valve opening, a sealing protrusion is provided on the valve core that fits the valve opening, and a spring is also provided in the valve seat to keep the sealing protrusion of the valve core and the valve opening in a close and sealed state; the air inlet end of the air vent tube is fixedly nested in the air outlet end of the one-way valve, the end of the valve core passes through the valve seat and the air vent tube, and the end of the valve core is fixedly connected to a baffle, and the baffle covers the air outlet of the air vent tube; the starting end of the valve core passes through the valve opening and extends to the air inlet of the valve seat; a heater is fixedly provided on the outer wall of the air vent tube; the air inlet end of the one-way valve is provided with a button for squeezing the valve core to make the one-way valve conductive.

2. A manual pressure relief device for an ultra-low temperature refrigerator according to claim 1, characterized in that: An extrusion head is provided at the starting end of the valve core, and the extrusion head is a stepped shaft structure. A connecting hole compatible with the starting end structure of the valve core is opened on the convex shaft with a smaller outer diameter of the extrusion head. The extrusion head is fixedly nested in the starting end of the valve core through the connecting hole, and the convex shaft with a larger outer diameter of the extrusion head is located outside the air inlet of the valve seat.

3. A manual pressure relief device for an ultra-low temperature refrigerator according to claim 2, characterized in that: The convex shaft with a smaller outer diameter of the extrusion head is gap-matched with the circumferential inner wall of the air inlet end of the valve seat. An air vent connected to the external environment is opened on the circumferential outer wall of the air inlet end of the valve seat, and the air vent is connected to the air inlet of the valve seat.

4. A manual pressure relief device for an ultra-low temperature refrigerator according to claim 1, characterized in that: The sealing protrusion of the valve core is a truncated cone structure, and the valve port is adapted to the structure of the sealing protrusion; a low-temperature sealing gasket is also provided at the joint between the sealing protrusion and the valve port.

5. The manual pressure relief device for an ultra-low temperature refrigerator according to claim 1, characterized in that: The valve core and the sealing protrusion are both provided with a venting groove on the circumferential outer wall at the valve port.

6. A manual pressure relief device for an ultra-low temperature refrigerator according to claim 1, characterized in that: The end of the button facing the one-way valve is provided with a tightening shaft, the outer wall of which is sleeved with a second spring, and the circumferential outer wall of the end of the button facing the one-way valve is provided with a limiting protrusion.

7. A manual pressure relief device for an ultra-low temperature refrigerator according to claim 1, characterized in that: The valve seat is provided with a flange ring, and the air outlet end of the air permeable pipe is provided with an outward-turned folded edge.

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