Bidirectional air pressure valve and refrigerator

Abstract

The invention discloses a two-way air pressure valve and a refrigerator, and relates to the technical field of refrigeration equipment. The two-way air pressure valve comprises a valve body, an inner elastic piece, an outer elastic piece, an inner cover, an outer cover and a locking sleeve. A positioning partition plate is arranged in the middle in the valve body, a first vent hole is formed in the center of the positioning partition plate, a second vent hole is formed in the position, located on the periphery of the first vent hole, of the positioning partition plate, and the inner elastic piece is elastically connected to the inner cover, abuts against the positioning partition plate and covers one of the first vent hole and the second vent hole. The outer elastic piece is elastically connected to the outer cover, abuts against the positioning partition plate and covers the other one of the first vent hole and the second vent hole, a clamping edge is arranged on the periphery, located on the positioning partition plate, of the valve body, and the locking sleeve is detachably connected to the periphery of the inner end of the valve body. The two-way air pressure valve and the refrigerator have the advantages of being small in size, simple in structure and convenient and easy to assemble, install and operate, and the interior of the valve body is not prone to icing.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a two-way pressure valve and a freezer. Background Technology

[0002] In existing technologies, freezers generally exhibit positive and negative pressure phenomena. The formation process of negative pressure is roughly as follows: gas exchange occurs between the inside and outside of the freezer compartment, with hot outside air entering the freezer compartment; after the door is closed, the temperature of the hot air inside the freezer compartment gradually decreases due to the cooling effect, reducing the pressure inside the freezer compartment and creating a pressure difference between the inside and outside of the freezer. The formation process of positive pressure is roughly as follows: when the freezer door is closed, the door will bring too much gas into the freezer, creating positive pressure.

[0003] Negative pressure can cause the following problems: difficulty in opening the door; door seals are easily deformed and cracked due to prolonged pulling, affecting the cabinet's airtightness, leading to cold leakage, frost or condensation, and high energy consumption; small and lightweight freezers are prone to tipping over. Positive pressure can cause the following problems: cabinet doors are easily pushed open by airflow, leading to cold leakage, frost, and increased energy consumption if not closed promptly; door seals are easily deformed by internal high pressure; to solve the problem of doors not closing properly, the door magnet or closing force is increased, but the door is even more difficult to open under negative pressure.

[0004] To address the issue of positive and negative pressure in freezers, existing technologies have developed bidirectional pressure valves. Common bidirectional pressure valves mainly include single-channel and dual-channel structures. However, using a dual-channel structure can easily lead to an increase in valve body size. On the other hand, some single-channel bidirectional pressure valves have complex overall structures, making it inconvenient to assemble the valve body and install or disassemble it. Furthermore, when pressure balancing valves are installed in freezers, ice can easily form inside the valve body, affecting the pressure balancing effect. Summary of the Invention

[0005] The purpose of this invention is to provide a two-way air pressure valve and a refrigerator, which is small in size, simple in structure, easy to assemble and install, and the valve body is not prone to icing, thus ensuring air pressure balance.

[0006] To achieve this objective, the present invention adopts the following technical solution: A bidirectional pneumatic valve is provided, comprising: a valve body, an inner spring, an outer spring, an inner cover, an outer cover, and a locking sleeve; the valve body is a tubular structure with openings at both ends, a positioning partition plate is provided in the middle of the valve body, a first vent hole is provided at the center of the positioning partition plate, and second vent holes are distributed in a ring around the outer periphery of the first vent hole on the positioning partition plate; a venting structure is provided between the inner cover and the outer cover; the outer cover is detachably connected to the outer opening of the valve body, and the inner cover is detachably connected to the valve body. At the inner end opening, the inner spring is elastically connected to the inner side of the inner cover, and the inner spring abuts against the positioning partition plate, covering one of the first vent hole and the second vent hole. The outer spring is elastically connected to the inner side of the outer cover, and the outer spring abuts against the positioning partition plate, covering the other of the first vent hole and the second vent hole. The valve body is provided with a retaining flange on the outer periphery at the positioning partition plate. The locking sleeve is detachably connected to the outer periphery of the inner end of the valve body.

[0007] As a preferred embodiment of the two-way pneumatic valve, the outer cover is threadedly connected to the outer end opening of the valve body, and the inner cover is threadedly connected to the inner end opening of the valve body.

[0008] As a preferred embodiment of the bidirectional pneumatic valve, an inner guide rod and an outer guide rod are vertically arranged at the center of each side of the positioning partition plate. An inner guide sleeve is vertically arranged at the center of the inner side of the inner cover, and an outer guide sleeve is vertically arranged at the center of the inner side of the outer cover. One end of the inner guide rod away from the positioning partition plate passes through the inner spring piece and is slidably connected to the inner guide sleeve. The other end of the outer guide rod away from the positioning partition plate passes through the outer spring piece and is slidably connected to the outer guide sleeve. An inner spring is sleeved on the outer periphery of the inner guide rod, and the two ends of the inner spring abut against the inner spring piece and the inner guide sleeve, respectively. An outer spring is sleeved on the outer periphery of the outer guide rod, and the two ends of the outer spring abut against the outer spring piece and the outer guide sleeve, respectively.

[0009] As a preferred embodiment of the bidirectional pneumatic valve, one or more inner guide rods are vertically arranged on the side of the inner spring away from the positioning partition plate, and one or more outer guide rods are vertically arranged on the side of the outer spring away from the positioning partition plate. An inner guide sleeve corresponding to the inner guide rod is vertically arranged on the inner side of the inner cover, and an outer guide sleeve corresponding to the outer guide rod is vertically arranged on the inner side of the outer cover. The end of the inner guide rod away from the inner spring is slidably connected to the inner guide sleeve, and the end of the outer guide rod away from the outer spring is slidably connected to the outer guide sleeve. An inner spring is sleeved on the outer periphery of the inner guide rod, and the two ends of the inner spring abut against the inner spring and the inner guide sleeve, respectively. An outer spring is sleeved on the outer periphery of the outer guide rod, and the two ends of the outer spring abut against the outer spring and the outer guide sleeve, respectively.

[0010] As a preferred embodiment of the two-way pneumatic valve, the inner end of the valve body is provided with an external thread on its outer wall, and the inner wall of the locking sleeve is provided with an internal thread. The locking sleeve is threadedly connected to the outer periphery of the inner end of the valve body.

[0011] As a preferred embodiment of the two-way pneumatic valve, sealing rings are respectively provided on the opposite surfaces of the locking sleeve and the retaining edge.

[0012] As a preferred embodiment of the two-way pneumatic valve, the ventilation structure of the inner cover is a hollow structure.

[0013] As a preferred embodiment of the two-way pneumatic valve, the venting structure of the outer cover consists of uniformly distributed air guide holes.

[0014] As a preferred embodiment of the two-way pneumatic valve, it also includes a baffle. The outer cover has a threaded hole at its center, and the baffle has a threaded post at its center on one side. The baffle is threadedly connected to the threaded hole of the outer cover through the threaded post, and there is a gap between the baffle and the outer cover.

[0015] The present invention also provides a freezer, the freezer including a cabinet body, the cabinet body having an installation hole at the refrigeration unit, the installation hole being fitted with a bidirectional air pressure valve as described in any one of the above claims, wherein the retaining edge is engaged with the outer wall of the cabinet body at the installation hole, and the locking sleeve is engaged with the inner wall of the cabinet body at the installation hole.

[0016] The beneficial effects of this invention are as follows: The bidirectional pneumatic valve proposed in this invention has a positioning partition plate in the middle of the valve body, and the positioning partition plate has a first vent hole and a second vent hole distributed in inner and outer rings. At the same time, the inner and outer spring pieces on both sides of the positioning partition plate elastically abut against and cover the first and second vent holes, so that the bidirectional pneumatic valve of this invention can achieve bidirectional airflow with a single-channel structure. The channel is large, the air pressure balance is more stable and smooth, and the structural layout is reasonable and simple, reducing the valve body volume without affecting the channel size. The inner and outer spring pieces are elastically connected by detachable inner and outer covers, respectively, so that the bidirectional pneumatic valve can be assembled and disassembled. The assembly and disassembly are convenient and simple, and it is convenient to clean the bidirectional pneumatic valve regularly to ensure the air pressure balance effect. Furthermore, the valve body has a retaining edge on the outer periphery at the positioning partition plate, that is, when the bidirectional pneumatic valve is installed, the inner and outer spring pieces are far away from the inside of the cabinet. At the same time, the bidirectional pneumatic valve is also installed in the mounting hole of the refrigeration unit in the cabinet, which can effectively utilize the waste heat generated by the refrigeration unit, prevent the spring pieces from freezing and sticking, and ensure the air pressure balance effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a bidirectional pneumatic valve according to an embodiment of the present invention; Figure 2 This is a side cross-sectional view of the bidirectional pneumatic valve according to an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the bidirectional pneumatic valve according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the valve body structure of a bidirectional pneumatic valve according to an embodiment of the present invention; Figure 5 This is a side cross-sectional view of the bidirectional pneumatic valve according to another embodiment of the present invention; Figure 6 This is an exploded structural diagram of the bidirectional pneumatic valve according to another embodiment of the present invention; Figure 7 This is a schematic diagram of the valve body structure of the bidirectional pneumatic valve according to another embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a freezer according to an embodiment of the present invention; In the picture: 1. Valve body; 2. Inner spring; 3. Outer spring; 4. Inner cover; 5. Outer cover; 6. Locking sleeve; 7. Positioning partition plate; 8. First vent hole; 9. Second vent hole; 10. Clamping edge; 11. Inner guide rod; 12. Outer guide rod; 13. Inner guide sleeve; 14. Outer guide sleeve; 15. Inner spring; 16. Outer spring; 17. Sealing ring; 18. Baffle; 19. Threaded post; 20. Cabinet. Detailed Implementation

[0019] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0020] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] Reference Figures 1-8 An embodiment of the present invention provides a bidirectional pneumatic valve, comprising: a valve body 1, an inner spring 2, an outer spring 3, an inner cover 4, an outer cover 5, and a locking sleeve 6; the valve body 1 is a tubular structure with openings at both ends, a positioning partition plate 7 is provided in the middle of the valve body 1, a first vent hole 8 is provided in the center of the positioning partition plate 7, and second vent holes 9 are distributed in a ring around the outer periphery of the positioning partition plate 7 at the first vent hole 8; a venting structure is provided between the inner cover 4 and the outer cover 5; the outer cover 5 is detachably connected to the outer opening of the valve body 1, and the inner cover 4 is detachably connected to the inner cover 5. At the inner end opening of the valve body 1, the inner spring piece 2 is elastically connected to the inner side of the inner cover 4, and the inner spring piece 2 abuts against the positioning partition plate 7 and covers one of the first vent hole 8 and the second vent hole 9. The outer spring piece 3 is elastically connected to the inner side of the outer cover 5, and the outer spring piece 3 abuts against the positioning partition plate 7 and covers the other of the first vent hole 8 and the second vent hole 9. The valve body 1 is provided with a retaining flange 10 on the outer periphery at the positioning partition plate 7, and the locking sleeve 6 is detachably connected to the outer periphery of the inner end of the valve body 1.

[0022] Specifically, the inner spring 2 can be a circular or annular structure, and correspondingly, the outer spring 3 can be an annular or circular structure. For example, in some embodiments, the inner spring 2 is circular, covering and sealing the first vent hole 8, while exposing and allowing ventilation of the second vent hole 9; the outer spring 3 is annular, covering and sealing the second vent hole 9, while exposing and allowing ventilation of the first vent hole 8. In other embodiments, the outer spring 3 is circular, covering and sealing the first vent hole 8, while exposing and allowing ventilation of the second vent hole 9; the inner spring 2 is annular, covering and sealing the second vent hole 9, while exposing and allowing ventilation of the first vent hole 8. In still other embodiments, the inner spring 2 and outer spring 3 can be adjusted based on the circular or annular structure, including: providing an outer ring matching the inner diameter of the valve body 1 on the outer periphery of the circular structure to ensure smoother sliding; providing a hollow structure in the middle of the annular structure for sliding connection with the guide rod; etc.

[0023] In the above technical solution, by providing a positioning partition plate 7 in the middle of the valve body 1, and by using a first vent hole 8 and a second vent hole 9 distributed in inner and outer rings on the positioning partition plate 7, and by having the inner spring plate 2 and the outer spring plate 3 on both sides of the positioning partition plate 7 elastically abut and cover the first vent hole 8 and the second vent hole 9 respectively, the bidirectional pneumatic valve of the present invention can achieve bidirectional ventilation with a single-channel structure. The channel is large, the air pressure balance is more stable and smooth, and the structural layout is reasonable and simple, reducing the volume of the valve body 1 without affecting the channel size; while the inner spring plate 2 and the outer spring plate 3 on both sides of the positioning partition plate 7... The spring 3 is elastically connected by the detachable inner cover 4 and outer cover 5, which allows the two-way air pressure valve to be assembled and disassembled. The assembly and disassembly are convenient and simple, and it is easy to clean the two-way air pressure valve regularly to ensure the air pressure balance effect. Furthermore, the valve body 1 is provided with a retaining edge 10 on the outer periphery of the positioning partition plate 7, that is, when the two-way air pressure valve is installed, the inner and outer springs are far away from the inside of the cabinet 20. At the same time, the two-way air pressure valve is also installed in the mounting hole of the refrigeration unit in the cabinet 20, which can effectively utilize the waste heat generated by the refrigeration unit, prevent the springs from freezing and sticking, and ensure the air pressure balance effect.

[0024] In some embodiments, the outer cover 5 is threaded to the outer end opening of the valve body 1, and the inner cover 4 is threaded to the inner end opening of the valve body 1. Specifically, in some embodiments, the outer periphery of the outer cover 5 is provided with external threads, and the inner wall of the outer end opening of the valve body 1 is provided with internal threads; the outer periphery of the inner cover 4 is provided with external threads, and the inner end opening of the valve body 1 is provided with internal threads; in other embodiments, the inner wall of the outer cover 5 is provided with internal threads, and the outer wall of the outer end opening of the valve body 1 is provided with external threads. In this embodiment, the threaded connection structure makes the installation and disassembly of the outer cover 5 and the inner cover 4 convenient and simple, and the connection is stable.

[0025] Reference Figures 2-4In this embodiment, an inner guide rod 11 and an outer guide rod 12 are vertically arranged at the center of each side of the positioning partition plate 7. An inner guide sleeve 13 is vertically arranged at the center of the inner side of the inner cover 4, and an outer guide sleeve 14 is vertically arranged at the center of the inner side of the outer cover 5. One end of the inner guide rod 11 away from the positioning partition plate 7 passes through the inner spring piece 2 and is slidably connected to the inner guide sleeve 13. One end of the outer guide rod 12 away from the positioning partition plate 7 passes through the outer spring piece 3 and is slidably connected to the outer guide sleeve 14. An inner spring 15 is sleeved on the outer periphery of the inner guide rod 11, and the two ends of the inner spring 15 abut against the inner spring piece 2 and the inner guide sleeve 13, respectively. An outer spring 16 is sleeved on the outer periphery of the outer guide rod 12, and the two ends of the outer spring 16 abut against the outer spring piece 3 and the outer guide sleeve 14, respectively. This structural design allows the inner spring 2 and the outer spring 3 to be elastically connected to the inner cover 4 and the outer cover 5, respectively, and to abut against the positioning partition plate 7. The elastic extension and contraction are stable, making it easy to assemble and disassemble. At the same time, the elasticity of the outer spring 3 and the inner spring 2 can be adjusted by rotating the threaded connection of the outer cover 5 and the inner cover 4.

[0026] Reference Figures 5-7 In some embodiments, two inner guide rods 11 are vertically arranged on the side of the inner spring piece 2 away from the positioning partition plate 7, and two outer guide rods 12 are vertically arranged on the side of the outer spring piece 3 away from the positioning partition plate 7. An inner guide sleeve 13 corresponding to the inner guide rod 11 is vertically arranged on the inner side of the inner cover 4, and an outer guide sleeve 14 corresponding to the outer guide rod 12 is vertically arranged on the inner side of the outer cover 5. The end of the inner guide rod 11 away from the inner spring piece 2 is slidably connected to the inner guide sleeve 13, and the end of the outer guide rod 12 away from the outer spring piece 3 is slidably connected to the outer guide sleeve 14. An inner spring 15 is sleeved on the outer periphery of the inner guide rod 11, and the two ends of the inner spring 15 abut against the inner spring piece 2 and the inner guide sleeve 13, respectively. An outer spring 16 is sleeved on the outer periphery of the outer guide rod 12, and the two ends of the outer spring 16 abut against the outer spring piece 3 and the outer guide sleeve 14, respectively. This structural design allows the inner spring 2 and the outer spring 3 to be elastically connected to the inner cover 4 and the outer cover 5 respectively using a combination of multiple guide rods and guide sleeves, and to abut against the positioning partition plate 7. The elastic extension and contraction are stable, making it easy to assemble and disassemble. At the same time, the elasticity of the outer spring 3 and the inner spring 2 can be adjusted by rotating the threaded connection of the outer cover 5 and the inner cover 4 respectively.

[0027] In some embodiments, the inner end of the valve body 1 has an external thread on its outer wall, and the inner wall of the locking sleeve 6 has an internal thread. The locking sleeve 6 is threadedly connected to the outer circumference of the inner end of the valve body 1. This structural design makes the installation and disassembly of the bidirectional air pressure valve more convenient and simple, and it can adapt to refrigerators with different wall thicknesses, thus having a wide range of applications.

[0028] Furthermore, sealing rings 17 are respectively provided on the opposing surfaces of the locking sleeve 6 and the retaining edge 10. The sealing rings 17 can effectively seal the refrigerator and prevent cold leakage. Furthermore, the opposing surfaces of the locking sleeve 6 and the retaining edge 10 are respectively provided with grooves for placing the sealing rings 17, ensuring that the sealing rings 17 are firmly fixed and not prone to displacement or cold leakage.

[0029] In some embodiments, the ventilation structure of the inner cover 4 is a hollow structure. This structural design allows the inner cover 4 to maintain its ventilation function. At the same time, the middle of the inner cover 4 can also be used to set up structures such as the inner guide sleeve 13, which also serves as an isolation and protection function.

[0030] In some embodiments, the ventilation structure of the outer cover 5 consists of evenly distributed air guide holes. This structural design allows the outer cover 5 to maintain its ventilation function. At the same time, the middle of the outer cover 5 can also be used to set up structures such as the outer guide sleeve 14, which also serves as an isolation and protection mechanism to prevent mosquitoes, insects, etc. from entering the valve body 1 and affecting the air pressure balance.

[0031] Furthermore, it also includes a baffle 18. A threaded hole is provided at the center of the outer surface of the outer cover 5, and a threaded post 19 is provided at the center of one side of the baffle 18. The baffle 18 is threadedly connected to the threaded hole of the outer cover 5 through the threaded post 19, and there is a gap between the baffle 18 and the outer cover 5. The baffle 18 serves to protect the air vent of the outer cover 5, preventing dust from falling directly onto the outer cover 5, clogging the air vent, and affecting the air pressure balance.

[0032] An embodiment of the present invention also provides a freezer, the freezer including a cabinet body 20, the cabinet body 20 having an installation hole at the refrigeration unit, the installation hole being fitted with a bidirectional air pressure valve of any of the above embodiments, wherein the retaining edge 10 is engaged with the outer wall of the cabinet body 20 at the installation hole, and the locking sleeve 6 is engaged with the inner wall of the cabinet body 20 at the installation hole.

[0033] In the above technical solution, the two-way air pressure valve is also installed in the mounting hole of the refrigeration unit located in the cabinet 20, which can effectively utilize the waste heat generated by the refrigeration unit, further prevent the inner spring 2 or the outer spring 3 from freezing and sticking, and ensure the air pressure balance effect.

[0034] In the description of this invention, it should be understood that the terms "middle," "length," "upper," "lower," "front," "rear," "vertical," "horizontal," "inner," "outer," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In this invention, unless otherwise expressly specified and limited, the first feature "on" the second feature may be in direct contact with the first and second features, or indirect contact with the first and second features through an intermediate medium. "A plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] The above description is merely illustrative of the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made without creative effort within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-way pneumatic valve, characterized in that, include: The valve body (1), inner spring (2), outer spring (3), inner cover (4), outer cover (5), and locking sleeve (6) are described. The valve body (1) is a tubular structure with openings at both ends. A positioning partition plate (7) is provided in the middle of the valve body (1). A first vent hole (8) is provided in the center of the positioning partition plate (7). A second vent hole (9) is distributed in a ring around the outer periphery of the positioning partition plate (7). A venting structure is provided between the inner cover (4) and the outer cover (5). The outer cover (5) is detachably connected to the outer opening of the valve body (1), and the inner cover (4) is detachably connected to the inner end of the valve body (1). At the opening, the inner spring piece (2) is elastically connected to the inner side of the inner cover (4), and the inner spring piece (2) abuts against the positioning partition plate (7) and covers one of the first vent hole (8) and the second vent hole (9). The outer spring piece (3) is elastically connected to the inner side of the outer cover (5), and the outer spring piece (3) abuts against the positioning partition plate (7) and covers the other of the first vent hole (8) and the second vent hole (9). The valve body (1) is provided with a retaining edge (10) on the outer periphery of the positioning partition plate (7). The locking sleeve (6) is detachably connected to the outer periphery of the inner end of the valve body (1).

2. The bidirectional pneumatic valve according to claim 1, characterized in that, The outer cover (5) is threaded to the outer end opening of the valve body (1), and the inner cover (4) is threaded to the inner end opening of the valve body (1).

3. The bidirectional pneumatic valve according to claim 2, characterized in that, The positioning partition plate (7) has an inner guide rod (11) and an outer guide rod (12) vertically arranged at the center of its two sides, the inner cover (4) has an inner guide sleeve (13) vertically arranged at the center of its inner side, and the outer cover (5) has an outer guide sleeve (14) vertically arranged at the center of its inner side. The end of the inner guide rod (11) away from the positioning partition plate (7) passes through the inner spring piece (2) and is slidably connected to the inner guide sleeve (13). The end of the outer guide rod (12) away from the positioning partition plate (7) passes through the outer spring piece (3) and is slidably connected to the outer guide sleeve (14). An inner spring (15) is sleeved around the outer periphery of the inner guide rod (11), and the two ends of the inner spring (15) abut against the inner spring piece (2) and the inner guide sleeve (13) respectively. An outer spring (16) is sleeved around the outer periphery of the outer guide rod (12), and the two ends of the outer spring (16) abut against the outer spring piece (3) and the outer guide sleeve (14) respectively.

4. The bidirectional pneumatic valve according to claim 2, characterized in that, One or more inner guide rods (11) are vertically arranged on the side of the inner spring piece (2) away from the positioning partition plate (7). One or more outer guide rods (12) are vertically arranged on the side of the outer spring piece (3) away from the positioning partition plate (7). An inner guide sleeve (13) corresponding to the inner guide rod (11) is vertically arranged on the inner side of the inner cover (4). An outer guide sleeve (14) corresponding to the outer guide rod (12) is vertically arranged on the inner side of the outer cover (5). The inner guide rod (11) is located away from the inner spring piece (2). One end of the outer guide rod (11) is slidably connected to the inner guide sleeve (13), and the other end of the outer guide rod (12) away from the outer spring piece (3) is slidably connected to the outer guide sleeve (14). An inner spring (15) is sleeved on the outer periphery of the inner guide rod (11), and the two ends of the inner spring (15) abut against the inner spring piece (2) and the inner guide sleeve (13) respectively. An outer spring (16) is sleeved on the outer periphery of the outer guide rod (12), and the two ends of the outer spring (16) abut against the outer spring piece (3) and the outer guide sleeve (14) respectively.

5. The bidirectional pneumatic valve according to claim 1, characterized in that, The inner end of the valve body (1) is provided with an external thread, and the inner wall of the locking sleeve (6) is provided with an internal thread. The locking sleeve (6) is threadedly connected to the outer periphery of the inner end of the valve body (1).

6. The bidirectional pneumatic valve according to claim 5, characterized in that, The locking sleeve (6) and the retaining edge (10) are respectively provided with sealing rings (17) on their opposite surfaces.

7. The bidirectional pneumatic valve according to claim 1, characterized in that, The ventilation structure of the inner cover (4) is a hollow structure.

8. The bidirectional pneumatic valve according to claim 1, characterized in that, The ventilation structure of the outer cover (5) consists of uniformly distributed air vents.

9. The bidirectional pneumatic valve according to claim 8, characterized in that, It also includes a baffle (18), and the outer cover (5) has a threaded hole at the center of its outer side surface. The baffle (18) has a threaded post (19) at the center of one side. The baffle (18) is threadedly connected to the threaded hole of the outer cover (5) through the threaded post (19), and there is a gap between the baffle (18) and the outer cover (5).

10. A freezer, characterized in that, The freezer includes a cabinet (20), and the cabinet (20) has an installation hole at the refrigeration unit. The installation hole is equipped with a bidirectional air pressure valve as described in any one of claims 1-9, wherein the retaining edge (10) is engaged with the outer wall of the cabinet (20) at the installation hole, and the locking sleeve (6) is engaged with the inner wall of the cabinet (20) at the installation hole.

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