Pressure balance valve of controlled atmosphere fresh-keeping storehouse

Abstract

The utility model provides a controlled atmosphere fresh-keeping storehouse pressure balance valve which comprises a communicating piece and a breather valve connected to the end portion of the communicating piece, the breather valve is located on the outer side of a controlled atmosphere fresh-keeping storehouse, and the breather valve is communicated with the inner space of the controlled atmosphere fresh-keeping storehouse through the communicating piece. According to the pressure balance valve, the inner space of the controlled atmosphere fresh-keeping storehouse is communicated with the breather valve located outside the controlled atmosphere fresh-keeping storehouse through the communicating piece, and the breather valve ensures that the controlled atmosphere fresh-keeping storehouse is isolated from the atmosphere within a certain pressure range and can be communicated with the atmosphere when the pressure exceeds or is lower than the pressure range; therefore, loss of cold air in the air-conditioned fresh-keeping storehouse is reduced while it is guaranteed that the cold storage door of the air-conditioned fresh-keeping storehouse is easy to open, when the pressure balance valve of the air-conditioned fresh-keeping storehouse is arranged, only the communicating piece needs to penetrate through the wall body of the air-conditioned fresh-keeping storehouse to enable the inner space of the air-conditioned fresh-keeping storehouse to be communicated with the breather valve, and the arrangement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse. Background Art

[0002] A controlled atmosphere fresh-keeping warehouse is a special type of cold storage, which can also be referred to as a "controlled atmosphere warehouse" or "cold storage / warehouse". The lowest temperature of a controlled atmosphere fresh-keeping warehouse is usually around 0°C. Depending on the type of storage, the highest temperature ranges from 12°C to 25°C. It is used to store vegetables, eggs or flowers and fruits. The relevant controlled atmosphere warehouse can be built with assembled insulation panels. This type of controlled atmosphere fresh-keeping warehouse has good airtightness to ensure a good and stable environment inside the controlled atmosphere fresh-keeping warehouse.

[0003] Due to the difference in temperature between the internal and external environments of the controlled atmosphere cold storage, there is a pressure difference between the internal and external environments of the controlled atmosphere cold storage, which is not conducive to the entry and exit of personnel and will create certain safety hazards. In addition, due to the pressure difference between the inside and outside, it may affect the use function of the cold storage.

[0004] In the related art, a pressure balancing bag is installed on the top of the controlled atmosphere fresh-keeping warehouse to achieve the balance of internal and external pressures. The effect is average in the application of controlled atmosphere fresh-keeping warehouse, and the construction and maintenance procedures are complicated, resulting in mediocre actual use effect and high layout cost. Utility Model Content

[0005] The utility model provides a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse, which is used to solve the defect of high arrangement cost in the prior art.

[0006] The pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model includes a connecting piece and a breathing valve connected to the end of the connecting piece. The breathing valve is located outside the controlled atmosphere fresh-keeping warehouse, and the connecting piece connects the breathing valve with the internal space of the controlled atmosphere fresh-keeping warehouse.

[0007] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, the breathing valve includes a valve body, a first one-way valve and a second one-way valve, a breathing chamber connected to the connecting piece is provided in the valve body, and a first air vent and a second air vent connected to the breathing chamber are provided on the valve body, the first one-way valve is connected to the first air vent, and the second one-way valve is connected to the second air vent, the gas flow direction of the first one-way valve is toward the outside of the breathing chamber, and the gas flow direction of the second one-way valve is toward the inside of the breathing chamber.

[0008] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, the first one-way valve includes a first valve housing and a first valve plate, the first valve housing is provided with a first through hole connected to the breathing chamber, the first valve plate is arranged on the outside of the breathing chamber to cover the first through hole, the second one-way valve includes a second valve housing and a second valve plate, the second valve housing is provided with a second through hole connected to the breathing chamber, the second valve plate is arranged on the inside of the breathing chamber to cover the second through hole.

[0009] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, the first valve housing and the second valve housing are detachably connected to the valve body.

[0010] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, a limiting cylinder is provided on the first valve housing, and the first valve plate is provided in the limiting cylinder.

[0011] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, the port of the limiting cylinder is connected to a limiting portion for limiting the first valve piece from separating from the limiting cylinder, and the limiting portion is provided with a third through hole connected to the limiting cylinder.

[0012] According to the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model, the limiting portion and the limiting cylinder are detachably connected.

[0013] According to the pressure balancing valve of the controlled atmosphere fresh-keeping storage provided by the utility model, the valve body is configured as a vertical circular tube structure, the first air vent is configured at the top end of the valve body, and the second air vent is configured at the bottom end of the valve body.

[0014] According to the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model, the connecting piece is configured as a straight pipe structure.

[0015] According to the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model, the connecting piece is connected to two fixing pieces, and the wall of the controlled atmosphere fresh-keeping warehouse is arranged between the two fixing pieces.

[0016] The utility model provides a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse. The connecting piece in the pressure balancing valve connects the internal space of the controlled atmosphere fresh-keeping warehouse with the breathing valve located outside the controlled atmosphere fresh-keeping warehouse. The breathing valve ensures that the controlled atmosphere fresh-keeping warehouse is isolated from the atmosphere within a certain pressure range, and can be connected to the atmosphere when the pressure exceeds or falls below this pressure range. Therefore, while ensuring that the refrigerated door of the controlled atmosphere fresh-keeping warehouse is easy to open, the loss of cold air in the controlled atmosphere fresh-keeping warehouse is reduced. When setting the pressure balancing valve for the controlled atmosphere fresh-keeping warehouse, it is only necessary to pass the connecting piece through the wall of the controlled atmosphere fresh-keeping warehouse to connect the interior of the controlled atmosphere fresh-keeping warehouse with the breathing valve, thereby reducing the layout cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural diagram of a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse provided by the utility model.

[0019] Figure 2 It is a schematic diagram of the connection relationship of the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model.

[0020] Reference numerals:

[0021] 1. Controlled atmosphere fresh-keeping storage wall; 2. Breathing valve; 21. Valve body; 211. Breathing chamber; 212. First vent; 213. Second vent; 22. First one-way valve; 221. First valve housing; 2211. First through hole; 222. First valve disc; 23. Second one-way valve; 231. Second valve housing; 2311. Second through hole; 232. Second valve disc; 3. Connecting piece; 31. Fixing piece; 4. First annular flange; 5. Second annular flange; 6. Limiting cylinder; 61. Limiting portion; 62. Third through hole. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of explaining the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0025] To preserve fruits, vegetables, and other items for extended periods, controlled atmosphere (CA) cold storage is often used. These facilities are rarely constructed using traditional civil engineering methods; instead, they often utilize prefabricated insulation panels as the enclosure structure. Prefabricated insulation panels in cold storage require a relatively sealed interior to ensure efficient refrigeration. However, the pressure differential between the interior and exterior of the cold storage makes it difficult to open and close the door, especially when the pressure differential is too large.

[0026] The following combination Figure 1-Figure 2 The utility model describes a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse.

[0027] The pressure balancing valve of the controlled atmosphere fresh-keeping warehouse provided by the utility model comprises a connecting piece 3 and a breathing valve 2 connected to the end of the connecting piece 3. The breathing valve 2 is located outside the controlled atmosphere fresh-keeping warehouse, and the connecting piece 3 connects the breathing valve 2 with the internal space of the controlled atmosphere fresh-keeping warehouse.

[0028] Specifically, if Figure 1 As shown, the connecting piece 3 passes through the wall 1 of the controlled atmosphere fresh-keeping warehouse, and the breathing valve 2 is connected to the outer end of the connecting piece 3 extending out of the wall 1 of the controlled atmosphere fresh-keeping warehouse. One end of the connecting piece 3 is connected to the breathing valve 2, and the other end is located inside the controlled atmosphere fresh-keeping warehouse to adjust the internal and external pressures. The hollow structure of the connecting piece 3 realizes the connection between the internal space of the controlled atmosphere fresh-keeping warehouse and the breathing valve 2. When the pressure difference between the inside and outside of the controlled atmosphere fresh-keeping warehouse is too large, the breathing valve 2 automatically connects the inside and outside of the controlled atmosphere fresh-keeping warehouse when adjusting the pressure inside and outside the controlled atmosphere fresh-keeping warehouse to achieve pressure balance; and when the internal and external pressures of the controlled atmosphere fresh-keeping warehouse are balanced, the internal environment of the controlled atmosphere fresh-keeping warehouse is isolated from the external environment to ensure the cooling efficiency inside the controlled atmosphere fresh-keeping warehouse. There is no possibility of manual operation errors and forgetfulness, which improves the overall safety. The connecting piece 3 and the breathing valve 2 can be made of hard plastic, which reduces the occurrence of cold bridge phenomenon. After using the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse, the heating and cooling time of the controlled atmosphere fresh-keeping warehouse can be shortened by 1 / 5 to 1 / 3, and the economic benefits during the temperature change period can be increased by 20% to 30%.

[0029] Specifically, the breathing valve 2 automatically opens when the air pressure inside the controlled atmosphere fresh-keeping warehouse is too high or too low relative to the external air pressure, connecting the space inside the controlled atmosphere fresh-keeping warehouse with the external space of the controlled atmosphere fresh-keeping warehouse, promoting the exchange of gases inside and outside the controlled atmosphere fresh-keeping warehouse, achieving the balance of the air pressure inside and outside the controlled atmosphere fresh-keeping warehouse, making the door of the controlled atmosphere fresh-keeping warehouse easy to open, and convenient for people to enter and exit; when the air pressure inside the controlled atmosphere fresh-keeping warehouse is balanced with the external air pressure, the breathing valve 2 closes, isolating the exchange of gases inside and outside the controlled atmosphere fresh-keeping warehouse, reducing the loss of cold air, improving the insulation effect, and ensuring the cooling efficiency inside the controlled atmosphere fresh-keeping warehouse. When setting the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse, it is only necessary to pass the connecting piece 3 through the wall of the controlled atmosphere fresh-keeping warehouse so that the interior of the controlled atmosphere fresh-keeping warehouse is connected to the breathing valve 2, thereby reducing the layout cost. At the same time, since the valve does not require manual operation, the labor intensity of the management personnel of the controlled atmosphere fresh-keeping warehouse is reduced.

[0030] The utility model provides a pressure balancing valve for a controlled atmosphere fresh-keeping warehouse. The connecting piece 3 in the pressure balancing valve connects the internal space of the controlled atmosphere fresh-keeping warehouse with the breathing valve 2 located outside the controlled atmosphere fresh-keeping warehouse. The breathing valve 2 ensures that the controlled atmosphere fresh-keeping warehouse is isolated from the atmosphere within a certain pressure range, and can be connected to the atmosphere when the pressure exceeds or falls below this pressure range. Therefore, while ensuring that the refrigerated door of the controlled atmosphere fresh-keeping warehouse is easy to open, the loss of cold air in the controlled atmosphere fresh-keeping warehouse is reduced. When setting the pressure balancing valve for the controlled atmosphere fresh-keeping warehouse, it is only necessary to pass the connecting piece 3 through the wall of the controlled atmosphere fresh-keeping warehouse to connect the internal space of the controlled atmosphere fresh-keeping warehouse with the breathing valve 2, thereby reducing the layout cost.

[0031] Furthermore, the breathing valve 2 includes a valve body 21, a first one-way valve 22 and a second one-way valve 23. A breathing chamber 211 connected to the connecting piece 3 is provided in the valve body 21, and a first air vent 212 and a second air vent 213 connected to the breathing chamber 211 are provided on the valve body 21. The first one-way valve 22 and the second one-way valve 23 are connected to the first air vent 212 and the second one-way valve 23 respectively. The gas flow direction of the first one-way valve 22 is toward the outside of the breathing chamber 211, and the gas flow direction of the second one-way valve 23 is toward the inside of the breathing chamber 211.

[0032] Specifically, if Figure 1As shown, when the air pressure inside the controlled atmosphere fresh-keeping warehouse is too high relative to the external air pressure, the first one-way valve 22 opens and the second one-way valve 23 closes, connecting the space inside the controlled atmosphere fresh-keeping warehouse with the external space of the controlled atmosphere fresh-keeping warehouse, and the gas inside the controlled atmosphere fresh-keeping warehouse is discharged from the first one-way valve 22, so that the internal and external air pressures of the controlled atmosphere fresh-keeping warehouse are balanced; when the air pressure inside the controlled atmosphere fresh-keeping warehouse is too low relative to the external air pressure, the first one-way valve 22 closes and the second one-way valve 23 opens, connecting the space inside the controlled atmosphere fresh-keeping warehouse with the external space of the controlled atmosphere fresh-keeping warehouse, and the gas inside the controlled atmosphere fresh-keeping warehouse is discharged from the first one-way valve 22, so that the internal and external air pressures of the controlled atmosphere fresh-keeping warehouse are balanced; The space is connected to the external space of the controlled atmosphere fresh-keeping warehouse, and the external air enters the controlled atmosphere fresh-keeping warehouse through the second one-way valve 23, so that the internal and external air pressures of the controlled atmosphere fresh-keeping warehouse are balanced, which facilitates the opening of the refrigerated door of the controlled atmosphere fresh-keeping warehouse and facilitates people to enter; when the internal air pressure of the controlled atmosphere fresh-keeping warehouse is balanced with the external air pressure, the first one-way valve 22 and the second one-way valve 23 are both kept closed, isolating the exchange of gas inside and outside the controlled atmosphere fresh-keeping warehouse, reducing the loss of cold air, and improving the insulation effect, so as to ensure the cooling efficiency inside the controlled atmosphere fresh-keeping warehouse.

[0033] Furthermore, the first one-way valve 22 includes a first valve housing 221 and a first valve plate 222. The first valve housing 221 is provided with a first through hole 2211 communicating with the breathing chamber 211. The first valve plate 222 is arranged on the outside of the breathing chamber 211 to cover the first through hole 2211. The second one-way valve 23 includes a second valve housing 231 and a second valve plate 232. The second valve housing 231 is provided with a second through hole 2311 communicating with the breathing chamber 211. The second valve plate 232 is arranged on the inside of the breathing chamber 211 to cover the second through hole 2311.

[0034] Specifically, if Figure 1 As shown, the first valve disc 222 covers the first through-hole 2211 from outside the breathing chamber 211, while the second valve disc 232 covers the second through-hole 2311 from inside the exhalation chamber, reducing the loss of cold air within the storage during pressure equalization. The valve body 21, connecting piece 3, first valve disc 222, and second valve disc 232 are all made of a frost-resistant rigid plastic, such as PA66, POM, or polytetrafluoroethylene, reducing the occurrence of cold bridges. The weight, size, thickness, and density of the first and second valve discs 222, 232 are determined based on the pressure differential control requirements within the controlled atmosphere storage.

[0035] There are two scenarios when the breathing valve 2 adjusts the air pressure. Scenario 1 is that during the heating process of the controlled atmosphere fresh-keeping warehouse, the internal pressure is higher than the external pressure of the controlled atmosphere fresh-keeping warehouse. The gas inside the breathing chamber simultaneously applies a thrust from the inside of the breathing chamber 211 to the outside of the breathing chamber 211 on the first valve plate 222 and the second valve plate 232, pushing the first valve plate 222 away from the first through hole 2211 and pushing the second valve plate 232 to press on the second through hole 2311; Scenario 2 is that during the cooling process of the controlled atmosphere fresh-keeping warehouse, the external pressure is higher than the internal pressure. At this time, the internal environment of the controlled atmosphere fresh-keeping warehouse is a low-pressure environment and the external environment is a high-pressure environment. The gas outside the breathing chamber 211 applies a thrust from the outside of the breathing chamber 211 to the inside of the breathing chamber 211 on the first valve plate 222 and the second valve plate 232, pushing the first valve plate 222 to press on the first through hole 2211 and pushing the second valve plate 232 away from the second through hole 2311.

[0036] In this embodiment, when the pressure inside and outside the controlled atmosphere fresh-keeping storage is adjusted in two scenarios, one of the first through hole 2211 and the second through hole 2311 will automatically open; and when the pressure inside and outside the controlled atmosphere fresh-keeping storage is balanced, the first through hole 2211 and the second through hole 2311 will remain closed, thereby automatically adjusting the pressure balance inside and outside the controlled atmosphere fresh-keeping storage.

[0037] It should be noted that the first air vent 212 and the second air vent 213 can also be set at other positions of the valve body 21. When the air pressure inside and outside the valve body 21 is balanced, an external force is set, such as a spring, to provide thrust for the first valve plate 222 and the second valve plate 232 respectively, pushing the first valve plate 222 to press on the first through hole 2211 from the outside of the valve body 21, and the second valve plate 232 to press on the second through hole 2311 from the inside of the breathing cavity 211.

[0038] Furthermore, the first valve housing 221 and the second valve housing 231 are detachably connected to the valve body 21.

[0039] Specifically, if Figure 1 As shown, the first annular flange 4 is fixedly connected to the upper end of the valve body 21, and the second annular flange 5 is fixedly connected to the lower end of the valve body 21, wherein the first annular flange 4 is upwardly engaged with the first valve housing 221, and the second annular flange 5 is downwardly engaged with the second valve housing 231. Through the detachable setting, the first one-way valve 22 and the second one-way valve 23 can be easily installed, repaired and replaced, reducing the difficulty and cost of maintenance.

[0040] Furthermore, a limiting cylinder 6 is provided on the first valve housing 221 , and the first valve disc 222 is provided in the limiting cylinder 6 .

[0041] Specifically, if Figure 1As shown, the first valve disc 222 is disposed within the limiting cylinder 6. This allows the movement of the first valve disc 222 to be limited during the process of being lifted up and suspended in the air and falling due to gravity to cover the first through-hole 2211, thereby ensuring stable installation and operation of the first valve disc 222. The second valve disc 232 is entirely located within the breathing cavity 211, preventing the second valve disc 232 from separating from the valve body 21.

[0042] Specifically, the edges and peripheral upper surfaces of the first through hole 2211 and the second through hole 2311 on the outer wall of the valve body 21 are processed by fine grinding and other processes to make their surfaces smooth. The planes corresponding to the first valve plate 222 and the second valve plate 232 are also processed by fine grinding, so that the first valve plate 222 and the edge of the first through hole 2211 fit more closely under normal conditions.

[0043] Furthermore, a limiting portion 61 for limiting the first valve disc 222 from separating from the limiting cylinder 6 is connected to the end of the limiting cylinder 6 , and a third through hole 62 communicating with the limiting cylinder 6 is provided on the limiting portion 61 .

[0044] Specifically, if Figure 1 、 Figure 2 As shown, the limiting portion 61 is provided at the upper end of the limiting cylinder 6 and is a shallow helmet-shaped structure with holes. It is annular when viewed from the top, and one side of the annular shape has an L-shaped cross-section. The circular hole in the middle of the top surface is the third through hole 62. The diameter of the third through hole 62 is smaller than that of the first valve disc 222, thereby limiting the first valve disc 222 from separating from the end of the limiting cylinder 6. It should be understood that the third through hole 62 can be set to other shapes and can be set to multiple in number, as long as it can achieve ventilation and limit the separation of the first valve disc 222.

[0045] Furthermore, the limiting portion 61 is detachably connected to the limiting cylinder 6 .

[0046] Specifically, if Figure 1 As shown, an internal thread can be provided on the inner wall of the limiting portion 61, and an external thread can be provided on the outer wall of the end of the limiting cylinder 6. The limiting portion 61 is screwed onto the end of the limiting cylinder 6 to achieve a detachable connection between the limiting portion 61 and the limiting cylinder 6, thereby facilitating the installation, maintenance, and replacement of the first valve disc 222 and reducing the difficulty and cost of subsequent maintenance. In another optional embodiment, the limiting portion 61 and the limiting cylinder 6 can also be detachably connected by a snap connection, an interference fit between the inner wall of the limiting portion 61 and the outer wall of the limiting cylinder 6, or a screw connection.

[0047] Furthermore, the valve body 21 is configured as a vertical circular tube structure, the first vent 212 is configured at the top end of the valve body 21 , and the second vent 213 is configured at the bottom end of the valve body 21 .

[0048] Specifically, if Figure 1 、 Figure 2As shown, the breathing valve 2 is configured as a dumbbell, with the valve body 21 configured as a vertical circular tube. The first vent 212 is located at the top of the valve body 21, and the second vent 213 is located at the bottom of the valve body 21. The diameter of the vertically arranged valve body 21 is larger than the diameter of the horizontally arranged connector. The first one-way valve 22 is connected to the first vent 212, and the second one-way valve 23 is connected to the second vent 213. The first valve disc 222 and the second valve disc 232 are configured as discs, which facilitates preparation and reduces overall production costs.

[0049] When the pressure inside and outside the valve body 21 is balanced, gravity forces the first valve disc 222 to cover the first through-hole 2211 from the outside of the valve body 21, while the second valve disc 232 covers the second through-hole 2311 from the inside of the valve body 21. A high differential pressure between the inside and outside of the valve body 21 exerts a lifting force on the first valve disc 222 or the second valve disc 232. When the lifting force exceeds the weight of the first valve disc 222 or the second valve disc 232, the first valve disc 222 or the second valve disc 232 overcomes gravity and is lifted into the air, respectively, opening the first through-hole 2211 or the second through-hole 2311. When the pressure differential between the inside and outside reaches equilibrium, gravity forces the first valve disc 222 and the second valve disc 232 to automatically cover the first through-hole 2211 and the second through-hole 2311, respectively, closing the first through-hole 2211 and the second through-hole 2311.

[0050] Furthermore, the connecting piece 3 is configured as a straight tube structure.

[0051] Specifically, such as Figure 1 As shown, the straight pipe structure is easy to assemble. Specifically, during assembly, the connecting pipe is passed through the insulation outer wall of the cold storage and then fixed. The entire assembly process is simple and the assembly difficulty is low.

[0052] In another optional embodiment, the connecting piece 3 can be arranged at an angle, that is, the end of the connecting piece 3 located inside the cold storage is higher than the end connected to the breathing valve 2. This arrangement can facilitate the discharge of condensed water in the pipe. The connecting piece 3 can also be configured as a curved pipe or other structure, as long as it can connect the interior of the cold storage with the breathing valve 2. When the connecting hole is opened, the gap between the connecting piece 3 and the connecting hole can be filled with thermal insulation material.

[0053] Furthermore, two fixing members 31 are connected to the connecting member 3 , and the wall of the controlled atmosphere fresh-keeping warehouse is arranged between the two fixing members 31 .

[0054] Specifically, during on-site installation, a mounting hole is opened in the controlled atmosphere fresh-keeping storage wall 1, through which the connecting piece 3 is passed. The fixing piece 31 is configured as an annular fixing flange, which secures the connecting piece 3 to the controlled atmosphere fresh-keeping storage wall 1. This improves the stability of the connection between the connecting piece 3 and the controlled atmosphere fresh-keeping storage wall 1. The annular fixing flange is made of a hard plastic with antifreeze properties, such as PA66, POM, or polytetrafluoroethylene.

[0055] It can be understood that through the above technical solution, the pressure balancing valve of the controlled atmosphere fresh-keeping warehouse is easy to install, which is conducive to quick assembly during batch installation, and the overall structure is simple, which is conducive to later maintenance and reduces maintenance difficulty and maintenance cost.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pressure balancing valve for a controlled atmosphere fresh-keeping warehouse, characterized in that: It includes a connecting piece and a breathing valve connected to the end of the connecting piece, the breathing valve is located outside the controlled atmosphere fresh-keeping warehouse, and the connecting piece connects the breathing valve with the internal space of the controlled atmosphere fresh-keeping warehouse; The breathing valve includes a valve body, a first one-way valve and a second one-way valve. A breathing chamber connected to the connecting piece is provided in the valve body. A first air vent and a second air vent connected to the breathing chamber are provided on the valve body. The first one-way valve is connected to the first air vent, and the second one-way valve is connected to the second air vent. The gas flow direction of the first one-way valve is toward the outside of the breathing chamber, and the gas flow direction of the second one-way valve is toward the inside of the breathing chamber.

2. The pressure balancing valve for a controlled atmosphere fresh-keeping warehouse according to claim 1 is characterized in that: The first one-way valve includes a first valve housing and a first valve plate, the first valve housing is provided with a first through hole communicating with the breathing chamber, and the first valve plate is arranged on the outside of the breathing chamber to cover the first through hole, and the second one-way valve includes a second valve housing and a second valve plate, the second valve housing is provided with a second through hole communicating with the breathing chamber, and the second valve plate is arranged on the inside of the breathing chamber to cover the second through hole.

3. The pressure balancing valve for a controlled atmosphere fresh-keeping warehouse according to claim 2 is characterized in that: The first valve housing and the second valve housing are detachably connected to the valve body.

4. The pressure balancing valve for a controlled atmosphere fresh-keeping warehouse according to claim 2 is characterized in that: A limiting cylinder is provided on the first valve housing, and the first valve plate is provided in the limiting cylinder.

5. The pressure balancing valve for a controlled atmosphere fresh-keeping warehouse according to claim 4 is characterized in that: A limiting portion for limiting the first valve plate from being separated from the limiting cylinder is connected to the end of the limiting cylinder, and a third through hole communicating with the limiting cylinder is provided on the limiting portion.

6. The pressure balancing valve for a controlled atmosphere fresh-keeping storage according to claim 5, characterized in that: The limiting portion is detachably connected to the limiting cylinder.

7. The pressure balancing valve for a controlled atmosphere fresh-keeping storage according to any one of claims 1 to 6, characterized in that: The valve body is configured as a vertical circular tube structure, the first vent is configured at the top end of the valve body, and the second vent is configured at the bottom end of the valve body.

8. The pressure balancing valve for a controlled atmosphere fresh-keeping storage according to any one of claims 1 to 6, characterized in that: The connecting piece is configured as a straight tube structure.

9. The pressure balancing valve for a controlled atmosphere fresh-keeping storage according to any one of claims 1 to 6, characterized in that: The connecting piece is connected with a fixing piece, and the wall of the controlled atmosphere fresh-keeping warehouse is arranged between the two fixing pieces.

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