CN212987733U - Air pressure balance door and refrigeration equipment - Google Patents

Abstract

The utility model provides an atmospheric pressure balance door and refrigeration plant relates to glass door technical field. The atmospheric pressure balanced door includes: glass plate, space frame and balanced valve. A plurality of glass plates are arranged at intervals; the spacing frame is arranged between two adjacent glass plates and is arranged at intervals with the glass plates, a sealing structure is arranged between the spacing frame and the two adjacent glass plates, the spacing frame, the sealing structure and the two adjacent glass plates form a drying sealing space in a surrounding mode, a drying agent is arranged in an inner cavity of the spacing frame, and one side of the spacing frame is provided with an air hole communicated with the drying sealing space; one end of the balance valve is communicated with the inner cavity of the spacing frame, and the other end of the balance valve is communicated with the external environment. Compared with the prior art, the function of balancing the air pressure inside and outside the door body is realized.

Description

Air pressure balance door and refrigeration equipment

Technical Field

The utility model relates to a glass door technical field particularly, relates to an atmospheric pressure balance door and refrigeration plant.

Background

The door body of fridge is mostly double-deck or multilayer cavity glass door, it is specifically sealed with effective support evenly to separate and the peripheral bonding by two or more glass, in order to guarantee inside dry airtight space that forms, but when external environment atmospheric pressure reduces suddenly, for example when the fridge transports high altitude area from low altitude area, outside atmospheric pressure reduces, the internal and external pressure difference of door increases, the cavity glass door just outward flexure may appear, vision deformation and sealed glue phenomenon such as fracture, take place serious consequence such as door body burst even, in addition, sealed glue fracture can lead to outside steam to get into, glass surface fogging, influence the condition in the observation box.

SUMMERY OF THE UTILITY MODEL

The utility model discloses when aiming at solving the inside of current cavity glass door and external atmospheric pressure difference to a certain extent and taking place great change, the cavity glass door just can appear outwards warping, vision deformation and sealed phenomenons such as glue fracture, takes place serious consequence such as the door body explodes even, and in addition, sealed glue fracture can lead to outside steam to get into, and glass surface fogging influences the problem of the condition in the observation box.

In order to solve at least one problem, the utility model provides an air pressure balance door, include:

the glass plates are arranged at intervals;

the glass plate separation device comprises a separation frame, a sealing structure and a drying agent, wherein the separation frame is arranged between two adjacent glass plates and is arranged at a distance from the glass plates, the sealing structure is arranged between the separation frame and the two adjacent glass plates, the separation frame, the sealing structure and the two adjacent glass plates form a drying sealing space in a surrounding mode, a drying agent is arranged in an inner cavity of the separation frame, and a vent hole communicated with the drying sealing space is formed in one side of the separation frame; and

and one end of the balance valve is communicated with the inner cavity of the spacing frame, and the other end of the balance valve is communicated with the external environment.

Further, the balancing valve is a bidirectional balancing valve.

Further, the balancing valve comprises a housing, a valve seat, a first umbrella valve and a second umbrella valve;

the valve seat is connected with the inner wall of the shell in a sealing mode, and the valve seat divides the interior of the shell into a first cavity and a second cavity;

the first umbrella valve and the second umbrella valve are respectively arranged on the valve seat, the first umbrella valve is used for limiting gas to flow from the first cavity to the second cavity, and the second umbrella valve is used for limiting gas to flow from the second cavity to the first cavity;

the inner cavity of the spacing frame is communicated with the first cavity, and the external environment is communicated with the second cavity.

Furthermore, a first air hole, a second air hole, a first mounting hole and a second mounting hole are formed in the valve seat, the first umbrella valve comprises a first valve plate and a first valve rod, the second umbrella valve comprises a second valve plate and a second valve rod, the first valve rod and the first valve plate are of an integrated structure, the second valve rod and the second valve plate are of an integrated structure, the first valve rod is installed in the first mounting hole, the first valve plate is suitable for elastic deformation to seal and open one end, far away from the first cavity, of the first air hole, the second valve rod is installed in the second mounting hole, and the second valve plate is suitable for elastic deformation to seal and open one end, far away from the second cavity, of the second air hole.

Furthermore, a first limiting ring is arranged on the first valve rod, a second limiting ring is arranged on the second valve rod, the first limiting ring is used for preventing the first valve rod from falling off from the first mounting hole, and the second limiting ring is used for preventing the second valve rod from falling off from the second mounting hole.

Furthermore, the first air holes are provided with a plurality of air holes, the second air holes are provided with a plurality of air holes, the first air holes are distributed around the first mounting holes at intervals, and the second air holes are distributed around the second mounting holes at intervals.

Further, the casing includes upper cover and lower cover, the upper cover is including being platelike upper cover plate and the upper cover section of thick bamboo that is the tube-shape, an upper cover section of thick bamboo with upper cover plate formula structure as an organic whole, the lower cover is including a lower cover plate and a lower cover section of thick bamboo, a lower cover section of thick bamboo with lower cover plate formula structure as an organic whole, an upper cover section of thick bamboo with a lower cover section of thick bamboo is connected, the disk seat with an upper cover section of thick bamboo or a lower cover section of thick bamboo is connected.

Furthermore, a supporting shoulder is formed in the inner wall of the upper cover cylinder, and the valve seat is clamped between the lower cover cylinder and the supporting shoulder through the matching of the lower cover cylinder and the supporting shoulder.

Further, the lower cover plate is provided with a protrusion, the protrusion extends along the edge of the lower cover plate, and the upper cover cylinder is supported on the protrusion.

Further, the sealing structure comprises an inner layer sealing glue and an outer layer sealing glue, the inner layer sealing glue is used for connecting the spacing frame with the glass plate in a sealing mode, and the outer layer sealing glue is used for connecting the balance valve with the spacing frame in a sealing mode.

In addition, the utility model also provides a refrigeration plant, include the atmospheric pressure balance door.

Since the technical improvement of the refrigerating apparatus and the technical effect obtained are the same as those of the air pressure balance door, the technical effect of the refrigerating apparatus will not be described in detail.

Compared with the prior art, the utility model provides a pair of atmospheric pressure balance door has but not be limited to following technological effect:

a dry sealed space is enclosed between two glass plates through a spacing frame and a sealing structure, one end of a balance valve is communicated with an inner cavity of the spacing frame, the other end of the balance valve is communicated with the external environment, when the air pressure of the external environment becomes low, such as when the glass plates are transported to a high altitude area from a low altitude area, and the difference between the air pressure of the external environment and the air pressure in the sealed dry space reaches a certain value, the balance valve is opened, then the air in the dry sealed space flows into the external environment through the balance valve, the pressure relief of the dry sealed space is realized, at the moment, the air pressure in the dry sealed space gradually decreases and approaches to the air pressure value of the external environment, when the difference between the air pressure of the external environment and the air pressure in the sealed dry space is smaller than the certain value, the balance valve is closed, the air pressure balance is completed, and meanwhile, in the process of air flow, the air, the gas in the dry sealed space is ensured to be dry all the time. The hollow glass door solves the problems that the existing hollow glass door can have the phenomena of outward deflection, visual deformation, structural adhesive fracture and the like due to the change of the internal and external air pressure difference, and even the door body is cracked and the like.

Drawings

Fig. 1 is a schematic structural view of an air pressure balance door according to an embodiment of the present invention;

FIG. 2 is an exploded view of a balanced valve according to an embodiment of the present invention;

FIG. 3 is a schematic block diagram of a balanced valve according to an embodiment of the present invention;

fig. 4 is an enlarged view of a portion a in fig. 3.

Description of the labeling:

1-glass plate, 2-spacing frame, 21-vent hole, 3-sealing structure, 31-inner layer sealant, 32-outer layer sealant, 4-desiccant, 5-balance valve, 51-shell, 511-upper cover, 5111-upper cover plate, 5112-upper cover cylinder, 512-lower cover, 5121-lower cover plate, 5122-lower cover cylinder, 5123-bulge, 52-valve seat, 521-first air hole, 522-second air hole, 523-first mounting hole, 524-second mounting hole, 53-first air pipe, 54-second air pipe, 55-first umbrella valve, 551-first valve plate, 552-first valve rod, 553-first spacing ring, 56-second umbrella valve, 561-second valve plate, 562-second valve rod, 563-second stop collar, 57-first cavity, 58-second cavity, 6-dry sealed space.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Also, in the drawings, the Z-axis represents a vertical, i.e., up-down position, and a positive direction of the Z-axis (i.e., an arrow direction of the Z-axis) represents up, and a negative direction of the Z-axis (i.e., a direction opposite to the positive direction of the Z-axis) represents down; it should also be noted that the foregoing Z-axis representation is meant only to facilitate the description of the invention and to simplify the description, and is not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered limiting of the invention.

The terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or an implicit indication of the number of technical features indicated. Thus, features defined as "first," "second," "third," and "fourth" may explicitly or implicitly include at least one of the features.

Referring to fig. 1, the present embodiment provides an air pressure balance door, including: glass plate 1, spacer frame 2 and balance valve 5. A plurality of glass plates 1 are arranged at intervals; the spacing frame 2 is arranged between two adjacent glass plates 1 and is arranged at intervals with the glass plates 1, specifically, the spacing frame 2 is arranged at the edge of the glass plates 1, a sealing structure 3 is arranged between the spacing frame 2 and the two adjacent glass plates 1, the spacing frame 2, the sealing structure 3 and the two adjacent glass plates 1 enclose a dry sealing space 6, a drying agent 4 is arranged in an inner cavity of the spacing frame 2, and a vent hole 21 communicated with the dry sealing space 6 is formed in one side of the spacing frame 2; one end of the balance valve 5 is communicated with the inner cavity of the spacing frame 2, and the other end of the balance valve 5 is communicated with the external environment.

Here, the spacing frame 2 mainly plays a role in supporting the two glass plates 1 to ensure that a space is left between the two glass plates 1, the sealing structure 3 seals the spacing frame 2 and the two glass plates 1, and then the spacing frame 2, the sealing structure 3 and the two glass plates 1 enclose a dry sealed space 6, it can be understood that the shape of the spacing frame 2 is similar to that of the glass plates 1, for example, when the glass plates 1 are rectangular, the spacing frame 2 is a frame shaped like a Chinese character 'hui', and when the glass plates 1 are circular, the spacing frame 2 is an annular frame. The inner cavity of the spacing frame 2 is provided with a drying agent 4, and the whole scheme is combined to know that the 'inner cavity of the spacing frame 2' does not mean the middle area surrounded by the spacing frame 2; the frame body of the spacing frame 2 is a hollow frame body, and the drying agent 4 is arranged in the hollow area of the frame body.

Here, a dry sealed space 6 is enclosed between the two glass plates 1 by the spacing frame 2 and the sealing structure 3, one end of the balance valve 5 is communicated with the inner cavity of the spacing frame 2, the other end of the balance valve 5 is communicated with the external environment, when the air pressure of the external environment becomes low, for example, when the glass plates are transported from a low altitude area to a high altitude area, and the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 reaches a certain value, the balance valve 5 is opened, and then the air in the dry sealed space 6 flows into the external environment through the balance valve 5, so as to realize the pressure relief of the dry sealed space 6, at this time, the air pressure in the dry sealed space 6 gradually decreases and approaches the air pressure value of the external environment, when the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 is smaller than the above-mentioned certain value, that the pressure difference is not, the air pressure balance is completed, the glass plate 1 is prevented from being bent outwards, the vision deformation, the breakage of the sealing structure and other phenomena, and even the serious consequence of breakage of the glass plate 1 are avoided, meanwhile, in the flowing process of air, the air in the dry sealing space 6 is always dry due to the fact that the air must pass through the drying agent 4 in the spacing frame 2, and the phenomenon that the fog on the glass plate 1 affects the visual field is avoided.

Preferably, the balancing valve 5 is a two-way balancing valve.

Here, the balance valve 5 is a bidirectional balance valve, and it is ensured that if the air pressure of the external environment is higher than the air pressure in the dry sealed space 6, the air pressure balance can be realized, that is, when the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 reaches a certain value, the balance valve 5 is opened, the air of the external environment enters the dry sealed space 6, until the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 is smaller than the certain value, that is, the pressure difference is not enough to open the balance valve 5, and then the balance valve 5 is closed, so that the air pressure balance door can be applied under various environments.

Referring to fig. 2 and 3, preferably, the balancing valve 5 comprises a housing 51, a valve seat 52, a first venting tube 53, a second venting tube 54, a first umbrella valve 55 and a second umbrella valve 56; the valve seat 52 is hermetically connected with the inner wall of the housing 51, the valve seat 52 divides the interior of the housing 51 into a first cavity 57 and a second cavity 58, and the valve seat 52 is provided with a first air hole 521 and a second air hole 522; one end of the first vent pipe 53 is communicated with the inner cavity of the spacing frame 2, and the other end of the first vent pipe 53 is communicated with the first cavity 57; one end of the second permeability cell 54 is communicated with the external environment, and the other end of the second permeability cell 54 is communicated with the second cavity 58; a first umbrella valve 55 and a second umbrella valve 56 are mounted on the valve seat 52, respectively, the first umbrella valve 55 defining a flow of gas from the first chamber 57 into the second chamber 58, and the second umbrella valve 56 defining a flow of gas from the second chamber 58 into the first chamber 57.

Here, for convenience of understanding, one end of the first ventilation tube 53 is an upper end of the first ventilation tube 53, and the other end of the first ventilation tube 53 is a lower end of the first ventilation tube 53; one end of the second permeability cell 54 is a lower end of the second permeability cell 54, and the other end of the second permeability cell 54 is an upper end of the second permeability cell 54.

Here, it can be understood that when the air pressure of the external environment is smaller than the air pressure in the dry sealed space 6 and the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 reaches a certain value, the first umbrella valve 55 is opened, and the flow direction of the gas in this case is the dry sealed space 6, the vent hole 21, the first vent pipe 53, the first cavity 57, the first vent hole 521, the second cavity 58, the second vent pipe 54, and the external environment in this order. When the air pressure of the external environment is greater than the air pressure in the dry sealed space 6 and the difference between the air pressure of the external environment and the air pressure in the sealed dry space 6 reaches a certain value, the air flows in this case sequentially to the external environment, the second vent pipe 54, the second cavity 58, the second vent 522, the first cavity 57, the first vent pipe 53, the vent 21, and the dry sealed space 6.

Referring to fig. 3 and 4, preferably, the valve seat 52 is provided with a first mounting hole 523 and a second mounting hole 524, the first umbrella valve 55 includes a first valve plate 551 and a first valve rod 552, the second umbrella valve 56 includes a second valve plate 561 and a second valve rod 562, the first valve rod 552 and the first valve plate 551 are of an integral structure, the second valve rod 562 and the second valve plate 561 are of an integral structure, the first valve rod 552 is mounted in the first mounting hole 523, the first valve plate 551 is suitable for being elastically deformed to close and open one end of the first air hole 521 far away from the first cavity 57, the second valve rod 562 is mounted in the second mounting hole 524, and the second valve plate 561 is suitable for being elastically deformed to close and open one end of the second air hole 522 far away from the second cavity 58.

Here, an end of the first air hole 521 away from the first cavity 57 is a lower end of the first air hole 521, and an end of the second air hole 522 away from the second cavity 58 is an upper end of the second air hole 522.

Here, "the first valve plate 551 is adapted to be elastically deformed to close and open an end of the first air hole 521 remote from the first cavity 57, and the second valve plate 561 is adapted to be elastically deformed to close and open an end of the second air hole 522 remote from the second cavity 58", it is conceivable that the first umbrella valve 55 and the second umbrella valve 56 may be a silicone umbrella valve. When the difference between the air pressure of the external environment and the air pressure in the sealed drying space 6 reaches a certain value, the first valve plate 551 or the second valve plate 561 is pushed open and deformed, so as to open the lower end of the first air hole 521 or the upper end of the second air hole 522; when the difference between the air pressure of the external environment and the air pressure in the sealed drying space 6 is not enough to open the first valve plate 551 or the second valve plate 561, the first valve plate 551 covers and closes the lower end of the first air hole 521, and the second valve plate 561 covers and closes the upper end of the second air hole 522.

Referring to fig. 4, preferably, the first valve stem 552 is provided with a first stopper ring 553, the second valve stem 562 is provided with a second stopper ring 563, the first stopper ring 553 is used to prevent the first valve stem 552 from falling out of the first mounting hole 523, and the second stopper ring 563 is used to prevent the second valve stem 562 from falling out of the second mounting hole 524.

Here, by providing the first limiting ring 553 and the second limiting ring 563, after the first valve rod 552 is installed in the first installation hole 523, the first limiting ring 553 and the first valve plate 551 are respectively located at both sides of the valve seat 52, and only under the action of the air pressure difference, the first valve rod 552 does not fall off from the first installation hole 523; after the second stem 562 is fitted into the second fitting hole 524, the second limiting ring 563 and the second valve plate 561 are respectively located at two sides of the valve seat 52, and the second stem 562 cannot fall off from the second fitting hole 524 only under the action of the air pressure difference. Here, the first and second limit rings 553 and 563 may be integrally formed on the first and second valve stems 552 and 562, respectively.

Referring to fig. 4, preferably, the first air holes 521 are provided in a plurality, the second air holes 522 are provided in a plurality, and the first air holes 521 are distributed around the first mounting hole 523 at intervals, so that the phenomenon that only one end of the first valve plate 551 is tilted when being pushed open by air pressure is avoided, and the first air holes 522 are distributed around the second mounting hole 524 at intervals.

Referring to fig. 3, preferably, the housing 51 includes an upper cover 511 and a lower cover 512, the upper cover 511 includes a plate-shaped upper cover 5111 and a cylindrical upper cover cylinder 5112, the upper cover cylinder 5112 is integrated with the upper cover 5111, the lower cover 512 includes a lower cover 5121 and a lower cover cylinder 5122, the lower cover cylinder 5122 is integrated with the lower cover 5121, the upper cover cylinder 5112 is connected with the lower cover cylinder 5122, and the valve seat 52 is connected with the upper cover cylinder 5112 or the lower cover cylinder 5122. The inner wall of the upper cover cylinder 5112 is opened with a support shoulder, and the valve seat 52 is clamped between the lower cover cylinder 5122 and the support shoulder by the cooperation of the lower cover cylinder 5122 and the support shoulder. The lower cover plate 5121 is provided with a projection 5123, the projection 5123 extends along the edge of the lower cover plate 5121, and the upper cover cylinder 5112 is supported on the projection 5123.

Here, when the balance valve 5 is assembled, the first valve rod 552 is first installed in the first installation hole 523 of the valve seat 52, the second valve rod 562 is then installed in the second installation hole 524 of the valve seat, and meanwhile, the first valve plate 551 and the second valve plate 561 are respectively ensured to be located at two sides of the valve seat 52, then the valve seat 52 is installed in the innermost part of the support shoulder in the upper cover cylinder 5112, then the lower cover cylinder 5122 is installed in the support shoulder to complete the compression of the valve seat 52, at this time, the upper cover cylinder 5112 is also supported on the annular protrusion 5123, and finally, the upper cover cylinder 5112 can be fixed by ultrasonic welding.

Referring to fig. 1, preferably, the sealing structure 3 comprises an inner layer sealant 31 and an outer layer sealant 32, wherein the inner layer sealant 31 is used for connecting the spacing frame 2 and the glass plate 1 in a sealing manner, and the outer layer sealant 32 is used for connecting the balance valve 5 and the spacing frame 2 in a sealing manner.

Here, when the air pressure balance door is formed, taking two glass plates 1 as an example, two glass plates 1 are placed in the air at a vertical interval, then the edge between the two glass plates 1 is fixed by the inner layer sealant 31 on the interval frame 2 with the desiccant 4 inside, that is, the geometric center of the interval frame 2 and the geometric center of the glass plate 1 are projected to the vertical plane to be coincident, then the first vent pipe 53 of the formed balance valve 5 passes through the frame hole formed in advance in the interval frame 2 and extends into the inner cavity of the interval frame 2, then the balance valve 5 is connected with the interval frame 2 by the outer layer sealant 32 in a sealing manner, and at this time, the bottom end of the second vent pipe 54 is located below the bottom end of the glass plate 1. Here, the outer sealant 32 may extend to the glass plates 1 on both sides when sealing the space frame 2 and the balance valve 5, and may enhance not only the structural strength of the sealing structure 3 itself but also the supporting function of the glass plates 1 on both sides.

In addition, the embodiment also provides a refrigerating device which comprises the air pressure balance door. Since the technical improvement and the technical effect of the refrigerating apparatus are the same as those of the air pressure balance door, the technical effect of the refrigerating apparatus will not be described in detail.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Without departing from the spirit and scope of the present disclosure, those skilled in the art can make various changes and modifications, which will fall into the scope of the present disclosure.

Claims (10)

1. An air pressure equalizing door, comprising:

a plurality of glass plates (1), wherein the glass plates (1) are arranged at intervals;

the glass plate drying device comprises a spacing frame (2) which is arranged between two adjacent glass plates (1) and is arranged at an interval with the glass plates (1), a sealing structure (3) is arranged between the spacing frame (2) and the two adjacent glass plates (1), the spacing frame (2), the sealing structure (3) and the two adjacent glass plates (1) enclose a drying sealing space (6), a drying agent (4) is arranged in an inner cavity of the spacing frame (2), and a vent hole (21) communicated with the drying sealing space (6) is formed in one side of the spacing frame (2); and

and one end of the balance valve (5) is communicated with the inner cavity of the spacing frame (2), and the other end of the balance valve is communicated with the external environment.

2. Air pressure balance door according to claim 1, characterized in that the balance valve (5) is a two-way balance valve.

3. Air pressure balance door according to claim 2, characterized in that the balance valve (5) comprises a housing (51), a valve seat (52), a first umbrella valve (55) and a second umbrella valve (56);

the valve seat (52) is connected with the inner wall of the shell (51) in a sealing mode, and the valve seat (52) divides the interior of the shell (51) into a first cavity (57) and a second cavity (58);

the first umbrella valve (55) and the second umbrella valve (56) are respectively mounted on the valve seat (52), the first umbrella valve (55) is used for limiting gas to flow from the first cavity (57) to the second cavity (58), the second umbrella valve (56) is used for limiting gas to flow from the second cavity (58) to the first cavity (57);

the inner cavity of the spacing frame is communicated with the first cavity, and the external environment is communicated with the second cavity.

4. The air pressure balance door of claim 3, wherein the valve seat (52) is provided with a first air hole (521), a second air hole (522), a first mounting hole (523) and a second mounting hole (524), the first umbrella valve (55) comprises a first valve plate (551) and a first valve rod (552), the second umbrella valve (56) comprises a second valve plate (561) and a second valve rod (562), the first valve rod (552) and the first valve plate (551) are of an integral structure, the second valve rod (562) and the second valve plate (561) are of an integral structure, the first valve rod (552) is mounted in the first mounting hole (523), the first valve plate (551) is suitable for elastic deformation to close and open one end of the first air hole (521) far away from the first cavity (57), and the second valve rod (562) is mounted in the second mounting hole (524), the second valve plate (561) is suitable for being elastically deformed to close and open one end, away from the second cavity (58), of the second air hole (522).

5. The air pressure balance door of claim 4, wherein the first valve rod (552) is provided with a first stop ring (553), the second valve rod (562) is provided with a second stop ring (563), the first stop ring (553) is used for preventing the first valve rod (552) from falling out of the first mounting hole (523), and the second stop ring (563) is used for preventing the second valve rod (562) from falling out of the second mounting hole (524);

the first air holes (521) are arranged in a plurality, the second air holes (522) are arranged in a plurality, the first air holes (521) are distributed around the first mounting hole (523) at intervals, and the second air holes (522) are distributed around the second mounting hole (524) at intervals.

6. The air pressure balance door of claim 3, wherein the housing (51) comprises an upper cover (511) and a lower cover (512), the upper cover (511) comprises a plate-shaped upper cover plate (5111) and a cylindrical upper cover cylinder (5112), the upper cover cylinder (5112) is of an integral structure with the upper cover plate (5111), the lower cover (512) comprises a lower cover plate (5121) and a lower cover cylinder (5122), the lower cover cylinder (5122) is of an integral structure with the lower cover plate (5121), the upper cover cylinder (5112) is connected with the lower cover cylinder (5122), and the valve seat (52) is connected with the upper cover cylinder (5112) or the lower cover cylinder (5122).

7. The air pressure balance door of claim 6, wherein the inner wall of the upper cover cylinder (5112) is provided with a support shoulder, and the lower cover cylinder (5122) is matched with the support shoulder to clamp the valve seat (52) between the lower cover cylinder (5122) and the support shoulder.

8. The air pressure equalizing door of claim 7, wherein the lower cover plate (5121) is provided with a protrusion (5123), the protrusion (5123) extending along an edge of the lower cover plate (5121), the upper cover cylinder (5112) being supported on the protrusion (5123).

9. A pressure equalizing door according to any one of claims 1 to 8, characterized in that the sealing structure (3) comprises an inner layer of sealant (31) and an outer layer of sealant (32), the inner layer of sealant (31) being used to sealingly connect the spacer frame (2) to the glazing panel (1), and the outer layer of sealant (32) being used to sealingly connect the equalizing valve (5) to the spacer frame (2).

10. A cold storage appliance comprising the air pressure equalizing door of any one of claims 1 to 9.

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