Air pressure balancing device and refrigerator

Abstract

The air pressure balancing device comprises an air storage tank, an air cylinder assembly and a transmission assembly, the air storage tank is communicated with the interior of the refrigerator and used for inflating the interior of the refrigerator to enable air pressure inside and outside a refrigerator body to be balanced before a refrigerator door is opened, and the air cylinder assembly is communicated with the air storage tank. The transmission assembly is connected with the refrigerator door and the air cylinder assembly and used for pushing air in the air cylinder assembly into the air storage tank in the closing process of the refrigerator door. In the closing process of the refrigerator door, the air in the air cylinder assembly is automatically stored in the air storage tank through the transmission assembly, so that when the refrigerator door is about to be opened and negative pressure appears in the refrigerator, the air can be filled into the refrigerator through the air storage tank, the air pressure in the refrigerator is balanced with the external air pressure, and therefore the refrigerator door can be normally opened.

Description

Technical Field

[0001] The utility model belongs to the field of refrigerators, and more specifically, relates to a gas pressure balance device and a refrigerator. Background Art

[0002] Generally, in order to make the refrigerator door easier to open, holes on the defrosting water receiving tray are connected to the outside to form gas pressure balance inside and outside the refrigerator, so that the refrigerator door can be opened normally. However, in some cases, such as when the holes on the defrosting water receiving tray are small and the refrigerator door is large, it is not easy for the air inside and outside the refrigerator to circulate, and it is very difficult to open the refrigerator door due to the large gas pressure difference inside and outside the refrigerator; and when the water in the defrosting water receiving tray freezes, the refrigerator door is also difficult to open. Usually, the diameter of the holes on the defrosting water receiving tray is increased to solve this problem, but this method will increase the leakage of cold air and cause losses.

[0003] Therefore, how to propose a device that can solve the problem of unbalanced gas pressure inside and outside the refrigerator is an urgent problem to be solved in the industry. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a gas pressure balance device and a refrigerator to solve the problem that the refrigerator door is difficult to open due to unbalanced gas pressure inside and outside the refrigerator in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a gas pressure balance device, including:

[0007] An air storage tank for inflating the inside of the refrigerator to balance the gas pressure inside and outside the refrigerator when the refrigerator door is about to be opened;

[0008] A cylinder assembly, the cylinder assembly is connected to the air storage tank;

[0009] A transmission assembly, the transmission assembly is respectively connected to the refrigerator door and the cylinder assembly, and is used for pushing the gas in the cylinder assembly into the air storage tank during the closing process of the refrigerator door.

[0010] Further, the cylinder assembly includes a housing, a plurality of air supply units arranged at intervals inside the housing, and an outer piston rod;

[0011] The plurality of air supply units are connected to the air storage tank through air pipes, and each air supply unit includes: an air cavity communicated with the air pipe, a piston movably arranged inside the air cavity, and an inner piston rod connected to the piston and the outer piston rod;

[0012] The outer piston rod is also connected to the transmission assembly, and is used for driving the inner piston rods of the plurality of air supply units to move synchronously under the action of the transmission assembly.

[0013] Further, the outer piston rod includes a pushing connection part and a transmission cooperation part located on two adjacent sides of the housing; the pushing connection part is connected to the inner piston rods of the plurality of air supply units, and the transmission cooperation part is connected to the transmission assembly.

[0014] Further, the transmission cooperation part is provided with a rack, and the transmission assembly includes:

[0015] A driving gear, mounted on the rotating shaft of the refrigerator door;

[0016] A first gear set, including a first upper gear and a first lower gear coaxially mounted, and the first lower gear is connected to the driving gear through a first belt;

[0017] A second gear set, including a second upper gear and a second lower gear coaxially mounted, the second upper gear is connected to the first upper gear through a second belt, and the second lower gear meshes with the rack.

[0018] Further, the pushing connection part, the transmission cooperation part and the rack are integrally arranged.

[0019] Further, the cylinder assembly is adjacent to the gas storage tank, the first end of the gas transmission pipe is communicated with the gas storage tank, the gas transmission pipe is provided with a plurality of branch pipes at intervals along its axial direction, and the plurality of branch pipes are in one-to-one correspondence and communication with the gas cavities of the plurality of air supply units.

[0020] Further, a one-way ventilation valve is arranged at the first end of the gas transmission pipe, and a two-way ventilation valve is arranged at the second end of the gas transmission pipe opposite to the first end.

[0021] Further, the gas storage tank adopts a flexible gas storage tank.

[0022] The present utility model also provides a refrigerator, including a refrigerator body and the air pressure balance device as described above.

[0023] Further, the refrigerator body includes a refrigerating chamber and a freezing chamber arranged up and down, and the gas storage tank is respectively connected to the refrigerating chamber and the freezing chamber.

[0024] Compared with the prior art, the beneficial effects of the air pressure balance device and the refrigerator provided by the present utility model are as follows:

[0025] 1. The present utility model adopts the transmission assembly to automatically store the gas in the cylinder assembly in the gas storage tank during the closing process of the refrigerator door, so that when the refrigerator door is about to be opened and the refrigerator has negative pressure, the gas storage tank can fill the gas into the refrigerator interior to balance the air pressure inside the refrigerator with the external air pressure, so that the refrigerator door can be opened normally.

[0026] 2. The connection between the rotating shaft of the refrigerator door, the transmission assembly and the cylinder assembly of the present utility model has damping, so that the user can hover the refrigerator door at any position after opening the refrigerator door, thereby greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic three-dimensional structure diagram of the refrigerator provided by the preferred embodiment of the present utility model;

[0029] Figure 2 For Figure 1 Enlarged structure diagram at position A in

[0030] Figure 3 Schematic top view structure diagram of the refrigerator provided by the preferred embodiment of the present utility model;

[0031] Figure 4 Schematic side view structure diagram of the refrigerator provided by the preferred embodiment of the present utility model;

[0032] Figure 5 Schematic front view structure diagram of the refrigerator provided by the preferred embodiment of the present utility model;

[0033] Among them, the main reference signs in the drawings are as follows:

[0034] 1. Gas storage tank; 2. Cylinder assembly; 3. Transmission assembly; 4. Refrigerator; 5. Refrigerator door; 20. Air supply unit; 21. Housing; 22. Inner piston rod; 23. Outer piston rod; 51. Rotating shaft; 24. Air delivery pipe; 25. One-way ventilation valve; 26. Two-way ventilation valve; 27. Branch pipe; 31. Driving gear; 32. First gear set; 33. Second gear set; 231. Pushing connection part; 232. Transmission cooperation part; 233. Rack; 321. First upper gear; 322. First lower gear; 323. Second upper gear; 324. Second lower gear; 341. First belt; 342. Second belt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the following further describes the present utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0036] Generally, in order to make the refrigerator door easier to open, it is connected to the outside through the holes on the defrosting water receiving tray to form air pressure balance inside and outside the refrigerator, so that the refrigerator door can be opened normally. However, in some cases, such as when the holes on the defrosting water receiving tray are small and the refrigerator door is large, it is not easy for the air inside and outside the refrigerator to circulate at this time. Due to the large air pressure difference inside and outside the refrigerator, it is very difficult to open the refrigerator door; and when the water in the defrosting water receiving tray freezes, the refrigerator door is also difficult to open. Usually, the diameter of the holes on the defrosting water receiving tray is increased to solve this problem, but this method will increase the leakage of cold air and cause losses. Based on this, the present utility model provides a pressure balance device and a refrigerator to solve the problem of unbalanced air pressure inside and outside the refrigerator.

[0037] Embodiment 1:

[0038] Please refer to Figures 1 to 5 together, the pressure balance device provided by the preferred embodiment of the present utility model includes:

[0039] An air storage tank 1, which is used to inflate the inside of the refrigerator 4 to make the air pressure inside and outside the refrigerator 4 balanced when the refrigerator door 5 is about to be opened;

[0040] A cylinder assembly 2, and the cylinder assembly 2 is connected to the air storage tank 1;

[0041] A transmission assembly 3, the transmission assembly 3 is respectively connected to the refrigerator door 5 and the cylinder assembly 2, and is used to push the gas in the cylinder assembly 2 into the air storage tank 1 during the closing process of the refrigerator door 5.

[0042] The pressure balance device provided by the present utility model automatically stores the gas in the cylinder assembly 2 in the air storage tank 1 during the closing process of the refrigerator door 5, so that when the refrigerator door 5 is about to be opened and the refrigerator 4 has a negative pressure, the air storage tank 1 can be used to inflate the inside of the refrigerator 4 to make the air pressure inside the refrigerator 4 balanced with the outside air pressure, so that the refrigerator door 5 can be opened normally.

[0043] In the preferred embodiment, the cylinder assembly 2 includes a housing 21, a plurality of air supply units 20 arranged at intervals inside the housing 21, and an outer piston rod 23.

[0044] The plurality of air supply units 20 are connected to the air storage tank 1 through an air pipe 24. Each air supply unit 20 includes: an air cavity communicated with the air pipe 24, a piston movably arranged inside the air cavity, and an inner piston rod 22 connected to the piston and the outer piston rod 23.

[0045] The outer piston rod 23 is also connected to the transmission assembly 3, and is used to drive the inner piston rods 22 of the plurality of air supply units 20 to move synchronously under the action of the transmission assembly 3.

[0046] It should be understood that the number of the air supply units 20 in the cylinder assembly 2 can be flexibly set according to actual application requirements. By way of example, the number of the air supply units 20 in the cylinder assembly 2 can be, but is not limited to, seven. The number of the air supply units 20 is proportional to the capacity of the air storage tank 1.

[0047] In the air pressure balancing device provided by the present utility model, the cylinder assembly 2 is provided to be composed of a housing 21, a plurality of air supply units 20 and an outer piston rod 23. The housing 21 can play a role in supporting and protecting the plurality of air supply units 20 inside it. The outer piston rod 23 can drive the inner piston rods 22 of the plurality of air supply units 20 to move synchronously through the transmission assembly 3 during the closing process of the refrigerator door 5, so that the pistons of the plurality of air supply units 20 move synchronously, thereby pushing the gas in the plurality of air supply units 20 into the air storage tank 1 to complete an automatic air storage process.

[0048] In a preferred embodiment, the outer piston rod 23 includes a pushing connection portion 231 and a transmission cooperation portion 232 located on two adjacent sides of the housing 21; the pushing connection portion 231 is connected to the inner piston rods 22 of the plurality of air supply units 20, and the transmission cooperation portion 232 is connected to the transmission assembly 3.

[0049] In the air pressure balancing device provided by the present utility model, the outer piston rod 23 is provided to be composed of the pushing connection portion 231 and the transmission cooperation portion 232, and moreover, it is connected to the cylinder assembly 2 through the pushing connection portion 231 and connected to the transmission assembly 3 through the transmission cooperation portion 232. The pushing connection portion 231 and the transmission cooperation portion 232 are located on two adjacent sides of the housing 21; by providing the outer piston rod 23 with such a structure, it can be ensured that the connection between the outer piston rod 23 and the cylinder assembly 2 and the connection between the outer piston rod 23 and the transmission assembly 3 do not interfere with each other, and at the same time, the space on two adjacent sides of the housing 21 is fully utilized, and the structure is compact and convenient to implement.

[0050] In a preferred embodiment, the transmission cooperation portion 232 is provided with a rack 233, and the rack 233 meshes with the corresponding gear in the transmission assembly 3 to drive the outer piston rod 23 to perform a linear motion through the rack and gear transmission method.

[0051] It is also possible to integrally provide the pushing connection portion 231, the transmission cooperation portion 232 and the rack 233. It should be understood that by integrally providing the pushing connection portion 231, the transmission cooperation portion 232 and the rack 233, the outer piston rod 23 as a whole is not separable. For example, the pushing connection portion 231, the transmission cooperation portion 232 and the rack 233 are integrally formed; or for another example, the pushing connection portion 231, the transmission cooperation portion 232 and the rack 233 are connected into a whole by welding. By adopting the outer piston rod 23 with an integral structure, the overall structure is more firm, so that the outer piston rod 23 can more reliably drive the plurality of pistons of the cylinder assembly 2 to perform a linear motion under the action of the transmission assembly 3.

[0052] It should be noted that in other embodiments, the rack 233 may not be provided on the outer piston rod 23. In this case, a connecting rod transmission method is adopted to drive the outer piston rod 23 to perform a linear motion.

[0053] In a preferred embodiment, a rack 233 is provided on the transmission cooperation part 232 of the outer piston rod 23. The transmission assembly 3 includes:

[0054] A driving gear 31, installed on the rotating shaft 51 of the refrigerator door 5;

[0055] A first gear set 32, including a first upper gear 321 and a first lower gear 322 coaxially installed. The first lower gear 322 is connected to the driving gear 31 through a first belt 341;

[0056] A second gear set 33, including a second upper gear 323 and a second lower gear 324 coaxially installed. The second upper gear 323 is connected to the first upper gear 321 through a second belt 342, and the second lower gear 324 meshes with the rack 233.

[0057] In the air pressure balancing device provided by the present utility model, the transmission assembly 3 is set to be composed of the driving gear 31, the first gear set 32, and the second gear set 33. During the closing process of the refrigerator door 5, the driving gear 31 rotates, drives the first lower gear 322 of the first gear set 32 to rotate through the first belt 341, and when the first lower gear 322 of the first gear set 32 rotates, the first upper gear 321 also rotates; drives the second upper gear 323 of the second gear set 33 to rotate through the second belt 342, and when the second upper gear 323 of the second gear set 33 rotates, the second lower gear 324 also rotates; since the second lower gear 324 meshes with the rack 233 of the outer piston rod 23, when the second lower gear 324 rotates, it drives the outer piston rod 23 to perform a linear motion, thus pushing a plurality of pistons to move in the corresponding air cavities, and further pushing the gas in a plurality of air supply units 20 into the storage tank 1. On the one hand, the air pressure balancing device provided by the present utility model completes the storage of gas during the closing process of the refrigerator door 5, creates favorable conditions for balancing the air pressure inside and outside the refrigerator 4, and further ensures that the refrigerator door 5 can be normally opened, with simple and convenient operation and easy implementation. On the other hand, with the transmission assembly 3 of this structure, there is damping in the indirect connection between the rotating shaft 51 of the refrigerator door 5 and the cylinder assembly 2, so that the refrigerator door 5 can hover at any position after being opened. It realizes solving the negative pressure problem of the refrigerator 4 and the hovering problem of the refrigerator door 5 in an efficient and low-energy-consuming manner.

[0058] In a preferred embodiment, the cylinder assembly 2 and the storage tank 1 are arranged adjacent to each other. The first end of the air delivery pipe 24 is connected to the storage tank 1, and a plurality of branch pipes 27 are arranged at intervals along the axial direction of the air delivery pipe 24. The plurality of branch pipes 27 are in one-to-one correspondence and communication with the air cavities of the plurality of air supply units 20.

[0059] In the air pressure balancing device provided by the present utility model, the cylinder assembly 2 is arranged adjacent to the gas storage tank 1, and the gas storage tank 1 is connected to multiple air supply units 20 of the cylinder assembly 2 through an air delivery pipe 24 and multiple branch pipes 27 arranged in parallel; this arrangement can shorten the pipeline length between the cylinder assembly 2 and the gas storage tank 1, save costs, has a simple structure, and is easy to implement.

[0060] In a preferred embodiment, a one-way ventilation valve 25 is provided at the first end of the air delivery pipe 24, and a two-way ventilation valve 26 is provided at the second end of the air delivery pipe 24 opposite to the first end.

[0061] In the air pressure balancing device provided by the present utility model, by respectively providing a one-way ventilation valve 25 and a two-way ventilation valve 26 at both ends of the air delivery pipe 24, the one-way connection between the air delivery pipe 24 and the gas storage tank 1 is realized, so that the gas in the gas storage tank 1 cannot flow back into the cylinder assembly 2; at the same time, the air delivery pipe 24 is in two-way connection with the external environment (or other air delivery pipelines), ensuring that the piston in the cylinder assembly 2 can move smoothly into place when the refrigerator door 5 is opened or closed, and ensuring that the refrigerator door 5 can be fully opened or closed.

[0062] In a preferred embodiment, the gas storage tank 1 is a flexible gas storage tank.

[0063] It should be understood that the gas storage tank 1 is made of a flexible material, and this flexible material needs to have a certain strength, durability, sealing property, and chemical stability to ensure the safe storage and use of gas. For example, the gas storage tank 1 is made of a material such as rubber with good elasticity and sealing property.

[0064] In the air pressure balancing device provided by the present utility model, a flexible gas storage tank is used to store gas, and this flexible gas storage tank has the advantages of light weight, good flexibility, and small volume.

[0065] Embodiment Two:

[0066] Please refer to Figures 1 to 5 , the refrigerator 4 provided by the preferred embodiment of the present utility model includes a refrigerator body and an air pressure balancing device.

[0067] The refrigerator 4 provided by the present utility model is provided with an air pressure balancing device, which balances the air pressure inside the refrigerator 4 with the external air pressure, so that the refrigerator door 5 can be opened normally.

[0068] In a preferred embodiment, the air pressure balancing device includes an air storage tank 1, a cylinder assembly 2 and a transmission assembly 3. During the closing process of the refrigerator door 5, the transmission assembly 3 pushes the gas in the cylinder assembly 2 into the air storage tank 1, so that when the refrigerator door 5 is about to be opened and a negative pressure appears in the refrigerator 4, the air storage tank 1 can fill the inside of the refrigerator 4 with gas, making the air pressure inside the refrigerator 4 balanced with the external air pressure, so that the refrigerator door 5 can be opened normally.

[0069] Among them, the air storage tank 1 is made of a flexible material and can be called a flexible air storage tank at this time.

[0070] Among them, the cylinder assembly 2 includes a housing 21, seven air supply units 20 arranged at intervals in the housing 21 and an outer piston rod 23. Each air supply unit 20 includes: an air cavity, a piston movably arranged inside the air cavity, and an inner piston rod 22 connected to the piston and the outer piston rod 23. The outer piston rod 23 includes a pushing connection portion 231 and a transmission cooperation portion 232 arranged vertically. The pushing connection portion 231 and the transmission cooperation are located on adjacent sides of the housing 21, and a rack 233 is further arranged on the side of the transmission cooperation portion 232 facing away from the housing 21.

[0071] At the same time, the cylinder assembly 2 is arranged adjacent to the air storage tank 1. The seven air supply units 20 of the cylinder assembly 2 are connected to the air storage tank 1 through an air pipe 24. The first end of the air pipe 24 is connected to the air storage tank 1. Seven branch pipes 27 are arranged at intervals along the axial direction of the air pipe 24, and the plurality of branch pipes 27 are in one-to-one correspondence with the air cavities of the plurality of air supply units 20. A one-way ventilation valve 25 is arranged at the first end of the air pipe 24, and a two-way ventilation valve 26 is arranged at the second end of the air pipe 24 opposite to the first end.

[0072] Among them, the transmission assembly 3 includes a driving gear 31, a first gear set 32 and a second gear set 33. The driving gear 31 is installed on the rotating shaft 51 of the refrigerator door 5. The first gear set 32 includes a first upper gear 321 and a first lower gear 322 coaxially installed. The first lower gear 322 is connected to the driving gear 31 through a first belt 341. The second gear set 33 includes a second upper gear 323 and a second lower gear 324 coaxially installed. The second upper gear 323 is connected to the first upper gear 321 through a second belt 342, and the second lower gear 324 meshes with the rack 233 of the outer piston rod 23.

[0073] In a preferred embodiment, the refrigerator body includes a refrigerating chamber and a freezing chamber arranged up and down, and the air storage tank 1 is respectively connected to the refrigerating chamber and the freezing chamber through pipelines. At the same time, the refrigerator door 5 includes an upper refrigerator door covering the refrigerating chamber and a lower refrigerator door covering the freezing chamber.

[0074] In the refrigerator 4 provided by the present utility model, the gas storage tank 1 is respectively connected to the refrigerating chamber and the freezing chamber, so that gas can be injected into the refrigerating chamber and the freezing chamber through the gas storage tank 1, making the air pressures in the refrigerating chamber and the freezing chamber equal to the external air pressure, and ensuring that the upper and lower refrigerator doors of the refrigerator 4 can be opened normally.

[0075] Based on the specific structures of the refrigerator and its air pressure balancing device introduced above, the working principle of opening / closing the refrigerator door will be elaborated in detail below:

[0076] When the user closes the refrigerator door 5, first control the one-way ventilation valve 25 to open and the two-way ventilation valve 26 to close. The rotation of the refrigerator door 5 drives the rotation of the driving gear 31, drives the rotation of the first lower gear 322 of the first gear set 32 through the first belt 341, and when the first lower gear 322 of the first gear set 32 rotates, the first upper gear 321 also rotates; drives the rotation of the second upper gear 323 of the second gear set 33 through the second belt 342, and when the second upper gear 323 of the second gear set 33 rotates, the second lower gear 324 also rotates; since the second lower gear 324 meshes with the rack 233 of the outer piston rod 23, when the second lower gear 324 rotates, it drives the outer piston rod 23 to move linearly, thus pushing a plurality of pistons to move in the corresponding air cavities, and further pushing the gas in a plurality of air supply units 20 into the gas storage tank 1. As the gas in the cylinder assembly 2 continuously enters the gas storage tank 1, the air pressure in the gas storage tank 1 continuously increases, making the air pressure in the gas storage tank 1 greater than the external air pressure. When the plurality of pistons move to a position close to the end position, control the two-way ventilation valve 26 to open to avoid affecting the closing of the refrigerator door 5. Because there is a one-way connection between the gas storage tank 1 and the cylinder assembly 2, the gas in the gas storage tank 1 cannot flow back into the cylinder assembly 2, so the gas discharged by the cylinder assembly 2 during the closing process of the refrigerator door 5 is stored in the gas storage tank 1, completing an automatic gas storage process.

[0077] When the user is about to open the door, detect the air pressure inside the refrigerator 4. When the air pressure inside the refrigerator 4 is lower than the external air pressure, control the gas storage tank 1 to inject gas into the refrigerating chamber and the freezing chamber of the refrigerator 4 to balance the air pressure inside and outside the refrigerator 4. Also control the two-way ventilation valve 26 to open. At this time, the refrigerator door 5 can be opened normally. After the refrigerator door 5 is opened, due to the connection between the rotating shaft 51 of the refrigerator door 5 and the first gear set 32, the second gear set 33 and the outer piston rod 23 having a certain damping effect, the refrigerator door 5 can achieve a hovering effect at any position after being opened, which is convenient for the user to pick up and place items, greatly improving the user experience.

[0078] It can be seen that the present utility model realizes the automatic storage of gas in the refrigerator by the rotation of the refrigerator door 5 to achieve the purpose of balancing the air pressure of the refrigerator. Its advantages are that the gas storage is completely completed during the user's use process, and at the same time, the refrigerator door 5 can hover at any position. The present utility model solves various problems in an efficient and low-energy-consuming manner.

[0079] Compared with the prior art, the beneficial effects of the air pressure balance device and the refrigerator provided by the present utility model are as follows:

[0080] 1. The present utility model adopts the method of automatically storing the gas in the cylinder assembly in the gas storage tank through the transmission assembly during the closing process of the refrigerator door, so that when the refrigerator door is about to be opened and negative pressure appears in the refrigerator, the gas can be filled into the refrigerator interior from the gas storage tank to balance the air pressure inside the refrigerator with the external air pressure, thereby enabling the refrigerator door to be opened normally.

[0081] 2. The present utility model adopts the connection between the rotating shaft of the refrigerator door, the transmission assembly and the cylinder assembly to have damping, so that the user can hover the refrigerator door at any position after opening the refrigerator door, greatly improving the user experience.

[0082] It should be noted that in the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0083] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An air pressure balancing device, characterized in that: include: The gas tank is used to fill the refrigerator with gas so that the air pressure inside and outside the refrigerator is balanced when the refrigerator door is about to be opened; A cylinder assembly, wherein the cylinder assembly is connected to the gas storage tank; A transmission assembly is connected to the refrigerator door and the cylinder assembly respectively, and is used to push the gas in the cylinder assembly into the gas storage tank when the refrigerator door is closed.

2. The air pressure balancing device according to claim 1, characterized in that: The cylinder assembly comprises a housing, a plurality of air supply units spaced apart in the housing, and an outer piston rod; The plurality of gas supply units are connected to the gas storage tank via a gas delivery pipe, and each of the gas supply units comprises: a gas cavity connected to the gas delivery pipe, a piston movably disposed inside the gas cavity, and an inner piston rod connected to the piston and the outer piston rod; The outer piston rod is also connected to the transmission assembly, and is used to drive the inner piston rods of the plurality of air supply units to move synchronously under the action of the transmission assembly.

3. The air pressure balancing device according to claim 2, characterized in that: The outer piston rod includes a push connection portion and a transmission matching portion located on two adjacent sides of the shell; the push connection portion is connected to the inner piston rods of the plurality of air supply units, and the transmission matching portion is connected to the transmission assembly.

4. The air pressure balancing device according to claim 3, characterized in that: The transmission matching part is provided with a rack, and the transmission assembly comprises: A driving gear, mounted on the rotating shaft of the refrigerator door; A first gear set, comprising a first upper gear and a first lower gear coaxially mounted, wherein the first lower gear is connected to the driving gear via a first belt; The second gear set includes a second upper gear and a second lower gear coaxially mounted, wherein the second upper gear is connected to the first upper gear via a second belt, and the second lower gear is meshed with the rack.

5. The air pressure balancing device according to claim 4, characterized in that: The pushing connection part, the transmission matching part and the rack are integrally arranged.

6. The air pressure balancing device as described in claim 2, wherein the cylinder assembly is arranged adjacent to the air storage tank, the first end of the air supply pipe is connected to the air storage tank, the air supply pipe is provided with a plurality of branch pipes at intervals along its axial direction, and the plurality of branch pipes are connected one-to-one with the air cavities of the plurality of air supply units.

7. The air pressure balancing device according to claim 6, characterized in that: The first end of the gas delivery pipe is provided with a one-way vent valve, and the second end of the gas delivery pipe, which is arranged opposite to the first end, is provided with a two-way vent valve.

8. The air pressure balancing device according to claim 1, characterized in that: The gas storage tank adopts a flexible gas storage tank.

9. A refrigerator, characterized in that The invention comprises a refrigerator body and an air pressure balancing device as described in any one of claims 1 to 8.

10. The refrigerator according to claim 9, characterized in that: The refrigerator body comprises a refrigerating chamber and a freezing chamber which are arranged up and down, and the gas storage tank is connected to the refrigerating chamber and the freezing chamber respectively.

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