Bidirectional air pressure valve and refrigerator

Abstract

The application discloses a kind of two-way air pressure valve and refrigerator, it is related to refrigeration equipment technical field.The two-way air pressure valve of the application includes: valve body, inner spring piece, outer spring piece, inner cover, outer cover and locking sleeve;The middle part in valve body is provided with positioning partition plate, the center of positioning partition plate is provided with first air hole, the outer periphery of positioning partition plate is provided with second air hole at first air hole, inner spring piece is elastically connected to inner cover, and inner spring piece is abutted to positioning partition plate, and covers one of first air hole and second air hole, outer spring piece is elastically connected to outer cover, and outer spring piece is abutted to positioning partition plate, and covers the other of first air hole and second air hole, the outer periphery of valve body at positioning partition plate is provided with clamping edge, locking sleeve is detachably connected to the inner end outer periphery of valve body;The two-way air pressure valve and refrigerator have small volume, simple structure, and it is not easy to appear icing in the interior of valve body, and assembly and installation operation are convenient and simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a bidirectional air pressure valve and a refrigerator. BACKGROUND

[0002] In the prior art, the refrigerator generally has positive and negative pressure, wherein the formation process of the negative pressure is roughly as follows: gas exchange is performed between the inner and outer compartments of the refrigerator, and the outer hot air enters the inner compartment of the refrigerator; after the door is closed, the temperature of the hot air in the inner compartment of the refrigerator gradually decreases under the action of refrigeration, the pressure in the inner compartment of the refrigerator decreases, and a pressure difference is formed between the inside and outside of the refrigerator; the formation process of the positive pressure is roughly as follows: when the door of the refrigerator is closed, too much gas is brought into the refrigerator by the door, and positive pressure is formed.

[0003] The negative pressure can cause the following problems: difficulty in opening the door; the door seal is easily deformed and cracked for a long time, thereby affecting the sealing performance of the cabinet, causing cold leakage, frost or condensation, high energy consumption, etc.; and the small and light refrigerator is easily tipped over. The positive pressure can cause the following problems: the door is easily blown open by the air flow, and if not closed in time, the cold leakage, frost, and high energy consumption can be caused; the door seal is easily deformed by the high internal pressure; in order to solve the problem of the door not being closed, the door magnetic force or return door force is increased, and the door is more difficult to open under negative pressure.

[0004] In order to solve the problem of positive and negative pressure of the refrigerator, some bidirectional air pressure valves appear in the prior art, and some common bidirectional air pressure valves mainly include single-channel and double-channel structures, for example, the double-channel structure can easily cause the valve body to increase in size, and some single-channel bidirectional air pressure valves have complex overall structures, which are not convenient for the assembly of the valve body itself and the installation and disassembly of the valve body; at the same time, when the air pressure balance valve is installed in the freezer, ice is easily formed in the valve body, which affects the air pressure balance effect. SUMMARY

[0005] The present application aims to provide a bidirectional air pressure valve and a refrigerator, which has a small size, a simple structure, and is convenient and simple to assemble and install, and ice is not easily formed in the valve body, thereby ensuring the air pressure balance effect.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The application provides a bidirectional air pressure valve, which comprises a valve body, an inner elastic sheet, an outer elastic sheet, an inner cover, an outer cover and a locking sleeve, the valve body is a tubular structure with open ends, a positioning partition plate is arranged in the middle of the valve body, a first air hole is arranged in the center of the positioning partition plate, second air holes are annularly arranged on the outer periphery of the first air hole, air passing structures are arranged in the middle of the inner cover and the outer cover, the outer cover is detachably connected to the outer end opening of the valve body, the inner cover is detachably connected to the inner end opening of the valve body, the inner elastic sheet is elastically connected to the inner side of the inner cover and abuts against the positioning partition plate and covers one of the first air hole and the second air holes, the outer elastic sheet is elastically connected to the inner side of the outer cover and abuts against the positioning partition plate and covers the other of the first air hole and the second air holes, a clamping edge is arranged on the outer periphery of the valve body at the positioning partition plate, and the locking sleeve is detachably connected to the inner end outer periphery of the valve body.

[0008] As a preferred scheme of the bidirectional air pressure 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.

[0009] As a preferred scheme of the bidirectional air pressure valve, inner guide rods and outer guide rods are vertically arranged in the centers of the two sides of the positioning partition plate, an inner guide sleeve is vertically arranged in the center of the inner side of the inner cover, an outer guide sleeve is vertically arranged in the center of the inner side of the outer cover, one end of the inner guide rod away from the positioning partition plate penetrates through the inner elastic sheet and is slidably connected to the inner guide sleeve, one end of the outer guide rod away from the positioning partition plate penetrates through the outer elastic sheet 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 elastic sheet and the inner guide sleeve, and 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 elastic sheet and the outer guide sleeve.

[0010] As a preferred scheme of the bidirectional air pressure valve, more than one inner guide rod is vertically arranged on the side of the inner elastic sheet away from the positioning partition plate, more than one outer guide rod is vertically arranged on the side of the outer elastic sheet 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, one end of the inner guide rod away from the inner elastic sheet is slidably connected to the inner guide sleeve, one end of the outer guide rod away from the outer elastic sheet 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 elastic sheet and the inner guide sleeve, and 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 elastic sheet and the outer guide sleeve.

[0011] As a preferred solution of the bidirectional air pressure valve, the inner end outer wall of the valve body is provided with external threads, the inner wall of the locking sleeve is provided with internal threads, and the locking sleeve is threadedly connected to the inner end outer periphery of the valve body.

[0012] As a preferred solution of the bidirectional air pressure valve, the opposite faces of the locking sleeve and the clamping edge are respectively provided with sealing rings.

[0013] As a preferred solution of the bidirectional air pressure valve, the ventilation structure of the inner cover is a hollow structure.

[0014] As a preferred solution of the bidirectional air pressure valve, the ventilation structure of the outer cover is uniformly distributed air guide holes.

[0015] As a preferred solution of the bidirectional air pressure valve, a baffle is further included, the outer side face center of the outer cover is provided with a threaded hole, one side center of the baffle is provided with a threaded column, the baffle is threadedly connected to the threaded hole of the outer cover through the threaded column, and a gap is formed between the baffle and the outer cover.

[0016] The application further provides a refrigerator, which comprises a cabinet body, the cabinet body is provided with a mounting hole at a refrigerating unit, and the bidirectional air pressure valve according to any one of the preceding solutions is mounted in the mounting hole, wherein the clamping edge is clamped to the outer wall of the cabinet body at the mounting hole, and the locking sleeve is clamped to the inner wall of the cabinet body at the mounting hole.

[0017] The bidirectional air pressure valve provided by the application can realize bidirectional ventilation by using a single channel structure, the channel is large, air pressure balance is more stable and smooth, the structure layout is reasonable and simple, the valve body volume is reduced without affecting the channel size, the inner elastic sheet and the outer elastic sheet are elastically connected through the detachable inner cover and the outer cover, so that the bidirectional air pressure valve can be assembled and disassembled, and the bidirectional air pressure valve can be conveniently cleaned regularly to ensure air pressure balance effect, the outer periphery of the valve body at the positioning partition plate is provided with a clamping edge, that is, the inner and outer elastic sheets are away from the interior of the cabinet body during installation, and the bidirectional air pressure valve is further installed in the mounting hole at the refrigerating unit of the cabinet body, so that the waste heat generated by the refrigerating unit can be effectively utilized to prevent the elastic sheets from being frozen and bonded, and air pressure balance effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced. Obviously, the drawings described below are only some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 is a structural schematic diagram of a bidirectional air pressure valve according to an embodiment of the present application;

[0020] Figure 2 is a side sectional structural schematic diagram of a bidirectional air pressure valve according to an embodiment of the present application;

[0021] Figure 3 is an exploded structural schematic diagram of a bidirectional air pressure valve according to an embodiment of the present application;

[0022] Figure 4 is a valve body structural schematic diagram of a bidirectional air pressure valve according to an embodiment of the present application;

[0023] Figure 5 is a side sectional structural schematic diagram of a bidirectional air pressure valve according to another embodiment of the present application;

[0024] Figure 6 is an exploded structural schematic diagram of a bidirectional air pressure valve according to another embodiment of the present application;

[0025] Figure 7 is a valve body structural schematic diagram of a bidirectional air pressure valve according to another embodiment of the present application;

[0026] Figure 8 is a structural schematic diagram of a refrigerator according to an embodiment of the present application;

[0027] In the drawings:

[0028] 1, valve body; 2, inner spring plate; 3, outer spring plate; 4, inner cover; 5, outer cover; 6, locking sleeve; 7, positioning partition plate; 8, first air hole; 9, second air 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 column; 20, cabinet body. DETAILED DESCRIPTION

[0029] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0030] Following, the embodiments of the present disclosure are described through specific examples, and other advantages and effects of the present disclosure can be easily understood by those skilled in the art from the disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications, without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0031] With reference to Figures 1-8 An embodiment of the present disclosure provides a bidirectional air pressure valve, comprising a valve body 1, an inner elastic sheet 2, an outer elastic sheet 3, an inner cover 4, an outer cover 5 and a locking sleeve 6. The valve body 1 is a tubular structure with open ends. A positioning partition plate 7 is arranged in the middle of the valve body 1. A first air hole 8 is arranged in the center of the positioning partition plate 7. Second air holes 9 are annularly distributed on the outer periphery of the positioning partition plate 7. The middle of the inner cover 4 and the outer cover 5 is provided with an air hole structure. The outer cover 5 is detachably connected to the outer end opening of the valve body 1. The inner cover 4 is detachably connected to the inner end opening of the valve body 1. The inner elastic sheet 2 is elastically connected to the inner side of the inner cover 4 and abuts against the positioning partition plate 7, covering one of the first air hole 8 and the second air holes 9. The outer elastic sheet 3 is elastically connected to the inner side of the outer cover 5 and abuts against the positioning partition plate 7, covering the other of the first air hole 8 and the second air holes 9. A clamping edge 10 is arranged on the outer periphery of the valve body 1 at the positioning partition plate 7. The locking sleeve 6 is detachably connected to the inner end outer periphery of the valve body 1.

[0032] Specifically, the inner elastic sheet 2 can be a circular structure or a ring structure, and correspondingly, the outer elastic sheet 3 can be a ring structure or a circular structure. For example, in some embodiments, the inner elastic sheet 2 is a circular structure, the inner elastic sheet 2 covers the first vent hole 8 to seal it, and the second vent hole 9 is exposed and ventilated. The outer elastic sheet 3 is a ring structure, the outer elastic sheet 3 covers the second vent hole 9 to seal it, and the first vent hole 8 is exposed and ventilated. In other embodiments, the outer elastic sheet 3 is a circular structure, the outer elastic sheet 3 covers the first vent hole 8 to seal it, and the second vent hole 9 is exposed and ventilated. The inner elastic sheet 2 is a ring structure, the inner elastic sheet 2 covers the second vent hole 9 to seal it, and the first vent hole 8 is exposed and ventilated. In other embodiments, the inner elastic sheet 2 and the outer elastic sheet 3 can be adjusted on the basis of the circular structure or the ring structure, including: an outer ring matched with the inner diameter of the valve body 1 is arranged on the outer periphery of the circular structure to ensure smooth sliding; a hollow structure is arranged in the middle of the ring structure for sliding connection with the guide rod; and the like.

[0033] In the above technical solution, the positioning partition plate 7 is arranged in the middle of the valve body 1, the first vent hole 8 and the second vent hole 9 are arranged in the inner and outer annular layers on the positioning partition plate 7, and the inner elastic sheet 2 and the outer elastic sheet 3 elastically abut and cover the first vent hole 8 and the second vent hole 9 on both sides of the positioning partition plate 7, respectively. Therefore, the single-channel structure of the bidirectional air pressure valve can realize bidirectional ventilation, the channel is large, the air pressure balance is more stable and smooth, the structure layout is reasonable and simple, the size of the valve body 1 is reduced without affecting the size of the channel, the inner elastic sheet 2 and the outer elastic sheet 3 are elastically connected through the detachable inner cover 4 and the outer cover 5, respectively, so that the bidirectional air pressure valve can be assembled and disassembled, and the assembly and disassembly are convenient and simple, the bidirectional air pressure valve can be cleaned regularly, and the air pressure balance effect is ensured. Further, the outer periphery of the valve body 1 at the positioning partition plate 7 is provided with a clamping edge 10, that is, the inner and outer elastic sheets are away from the inside of the cabinet 20 during installation of the bidirectional air pressure valve, and the bidirectional air pressure valve is also installed in the mounting hole at the refrigerating unit of the cabinet 20, so that the waste heat generated by the refrigerating unit can be effectively utilized to prevent the elastic sheets from being frozen and bonded, and the air pressure balance effect is ensured.

[0034] In some embodiments, the outer cover 5 is threadedly connected to the outer end opening of the valve body 1, and the inner cover 4 is threadedly connected 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 part of 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 the present 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.

[0035] Reference Figures 2-4In the embodiment, the center of the two sides of the positioning partition plate 7 is vertically provided with an inner guide rod 11 and an outer guide rod 12 respectively, the inner side of the inner cover 4 is vertically provided with an inner guide sleeve 13, the inner side of the outer cover 5 is vertically provided with an outer guide sleeve 14, one end of the inner guide rod 11 away from the positioning partition plate 7 penetrates through the inner elastic sheet 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 penetrates through the outer elastic sheet 3 and is slidably connected to the outer guide sleeve 14, the outer periphery of the inner guide rod 11 is sleeved with an inner spring 15, and the two ends of the inner spring 15 abut against the inner elastic sheet 2 and the inner guide sleeve 13 respectively, and the outer periphery of the outer guide rod 12 is sleeved with an outer spring 16, and the two ends of the outer spring 16 abut against the outer elastic sheet 3 and the outer guide sleeve 14 respectively. The structure design makes the inner elastic sheet 2 and the outer elastic sheet 3 be elastically connected to the inner cover 4 and the outer cover 5 respectively and abut against the positioning partition plate 7, and be stable in elastic expansion and contraction, facilitating assembly and disassembly, and the elasticity of the outer elastic sheet 3 and the inner elastic sheet 2 can be adjusted by rotating the threaded connection amount of the outer cover 5 and the inner cover 4 respectively.

[0036] Referring to Figures 5-7 In some embodiments, the inner elastic sheet 2 is vertically provided with two inner guide rods 11 away from one side of the positioning partition plate 7, the outer elastic sheet 3 is vertically provided with two outer guide rods 12 away from one side of the positioning partition plate 7, the inner side of the inner cover 4 is vertically provided with an inner guide sleeve 13 corresponding to the inner guide rod 11, the inner side of the outer cover 5 is vertically provided with an outer guide sleeve 14 corresponding to the outer guide rod 12, one end of the inner guide rod 11 away from the inner elastic sheet 2 is slidably connected to the inner guide sleeve 13, one end of the outer guide rod 12 away from the outer elastic sheet 3 is slidably connected to the outer guide sleeve 14, the outer periphery of the inner guide rod 11 is sleeved with an inner spring 15, and the two ends of the inner spring 15 abut against the inner elastic sheet 2 and the inner guide sleeve 13 respectively, and the outer periphery of the outer guide rod 12 is sleeved with an outer spring 16, and the two ends of the outer spring 16 abut against the outer elastic sheet 3 and the outer guide sleeve 14 respectively. The structure design makes the inner elastic sheet 2 and the outer elastic sheet 3 be elastically connected to the inner cover 4 and the outer cover 5 respectively by using the cooperation structure of multiple guide rods and guide sleeves and abut against the positioning partition plate 7, and be stable in elastic expansion and contraction, facilitating assembly and disassembly; and the elasticity of the outer elastic sheet 3 and the inner elastic sheet 2 can be adjusted by rotating the threaded connection amount of the outer cover 5 and the inner cover 4 respectively.

[0037] In some embodiments, the inner end outer wall of the valve body 1 is provided with external threads, the inner wall of the locking sleeve 6 is provided with internal threads, and the locking sleeve 6 is threadedly connected to the inner periphery of the valve body 1. The structure design makes the installation and disassembly of the bidirectional air pressure valve more convenient and simple, and can adapt to refrigerators with different wall thicknesses, and has a wide range of applications.

[0038] Further, the opposite surfaces of the locking sleeve 6 and the clamping edge 10 are respectively provided with sealing rings 17. The sealing rings 17 can effectively play a sealing effect to prevent the refrigerator from leaking cold. Further, the opposite surfaces of the locking sleeve 6 and the clamping edge 10 are respectively provided with grooves for placing the sealing rings 17, so as to ensure that the sealing rings 17 are fixed stably and are not prone to position deviation and cold leakage.

[0039] In some embodiments, the ventilation structure of the inner cover 4 is a hollow structure. This structure design enables the inner cover 4 to maintain the ventilation function, and meanwhile, the middle of the inner cover 4 can be used to arrange structures such as the inner guide sleeve 13, thereby playing a role of isolation protection.

[0040] In some embodiments, the ventilation structure of the outer cover 5 is uniformly distributed air guide holes. This structure design enables the outer cover 5 to maintain the ventilation function, and meanwhile, the middle of the outer cover 5 can be used to arrange structures such as the outer guide sleeve 14, thereby playing a role of isolation protection to prevent some mosquitoes and insects from entering the valve body 1 and affecting the air pressure balance effect.

[0041] Further, the outer side surface of the outer cover 5 is provided with a threaded hole, one side of the baffle 18 is provided with a threaded column 19, the baffle 18 is threadedly connected to the threaded hole of the outer cover 5 through the threaded column 19, and the baffle 18 has a gap with the outer cover 5. The baffle 18 plays a protection role for the air guide holes of the outer cover 5, prevents dust from directly falling on the outer cover 5, and prevents the air guide holes from being blocked and affecting the air pressure balance effect.

[0042] An embodiment of the present application also provides a refrigerator, which comprises a cabinet body 20, the cabinet body 20 is provided with a mounting hole at a refrigeration unit, and the mounting hole is mounted with the bidirectional air pressure valve of any one of the above-mentioned embodiments, wherein the clamping edge 10 is clamped to the outer wall of the cabinet body 20 at the mounting hole, and the locking sleeve 6 is clamped to the inner wall of the cabinet body 20 at the mounting hole.

[0043] In the above technical solution, the bidirectional air pressure valve is also mounted in the mounting hole at the refrigeration unit of the cabinet body 20, so that the waste heat generated by the refrigeration unit can be effectively utilized, and the ice adhesion of the inner elastic sheet 2 or the outer elastic sheet 3 is further prevented, thereby ensuring the air pressure balance effect.

[0044] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “middle”, “length”, “upper”, “lower”, “front”, “rear”, “vertical”, “horizontal”, “inner”, “outer”, “radial” and “circumferential” are based on the orientations or positional relationships shown in the drawings, 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In the present application, unless specifically defined otherwise and limited, a first feature "on" a second feature can be directly contacting the first and second features, or indirectly contacting the first and second features through an intermediate medium. The meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise and limited.

[0046] In the present application, unless specifically defined otherwise and limited, the terms "mounting", "connected", "connecting", "fixed", and similar terms should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] The above is only to illustrate the embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application without creative labor shall be included in the protection scope of the present application.

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). The inner cover (4) is detachably connected to the inner opening of the valve body (1). At the end 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). 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). 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.

2. The bidirectional pneumatic valve according to claim 1, 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.

3. 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).

4. The bidirectional pneumatic valve according to claim 3, characterized in that, The locking sleeve (6) and the retaining edge (10) are respectively provided with sealing rings (17) on their opposite surfaces.

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

6. 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.

7. The bidirectional pneumatic valve according to claim 6, 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).

8. 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 1-7, 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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