Pressure balance valve of low-temperature cold storage

Abstract

The utility model relates to the technical field of valves, and provides a low-temperature cold storage pressure balance valve which comprises a valve body, a first valve head and a second valve head. A balance channel is vertically arranged in the valve body, a first valve port and a second valve port are correspondingly formed in the top and the bottom of the valve body, and an external channel is further formed in the valve body; the first valve head is rotationally arranged at the first valve port, the second valve head is rotationally arranged at the second valve port and located in the balance channel, and the external channel is used for being communicated with the outside to balance internal and external pressure. The first valve port and the second valve port are correspondingly formed in the top and the bottom of the balance channel, and the valve heads are arranged on the two valve ports, so that balance of internal and external pressure difference can be automatically realized through the corresponding valve heads when pressure difference exists inside and outside, the whole structure is simple and does not need to be controlled manually or by other means, and the cost is reduced. The manufacturing and using cost is low, and the balance of the internal and external pressure difference can be effectively achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure balancing valve for a low-temperature cold storage. Background Art

[0002] Freezers are mainly used to store items for a long time. Among the related low-temperature freezers, there are assembled plate type freezers. This type of low-temperature freezer has good air tightness to ensure a good cooling environment for the low-temperature freezer.

[0003] Due to the difference in temperature between the inside and outside of the low-temperature freezer, there is a pressure difference between the inside and outside of the low-temperature freezer, which is not conducive to personnel entering the freezer and will create certain safety hazards. In addition, due to the pressure difference between the inside and outside, this may affect the use function of the freezer.

[0004] In the related art, some existing valve bodies are used to achieve the balance of internal and external pressures. This method has poor application effect in low-temperature freezers, and manual or electric control is complicated, resulting in poor actual use effect and high layout cost. Utility Model Content

[0005] The utility model provides a low-temperature cold storage pressure balancing valve, which is used to solve the defects of the valve body in the prior art that it is difficult to achieve pressure balance inside and outside the low-temperature cold storage, the finished product is high, and the control is complicated.

[0006] The utility model provides a pressure balancing valve for a low-temperature cold storage, comprising: a valve body, a first valve head and a second valve head; a vertically arranged balancing channel is provided in the valve body, a first valve port is provided at the top of the valve body, a second valve port is provided at the bottom of the valve body, an external channel is provided on the valve body between the first valve port and the second valve port, and the first valve port, the second valve port and the external channel are all connected to the balancing channel; the first valve head is rotatably set at the first valve port, and the first valve head is used to cooperate with the first valve port to control the opening or closing of the first valve port, the second valve head is rotatably set at the second valve port and is located in the balancing channel, the second valve head is used to cooperate with the second valve port to control the opening or closing of the second valve port, and the external channel is used to communicate with the outside to balance the internal and external pressures.

[0007] According to the low-temperature cold storage pressure balancing valve provided by the utility model, the balancing valve also includes an external pipe, one end of which is connected to the external channel, and the other end of the external pipe is located outside the low-temperature cold storage for communication with the outside.

[0008] According to the low-temperature cold storage pressure balancing valve provided by the utility model, the external pipe is arranged to be inclined downward, and a connecting elbow is provided at the port of the external pipe.

[0009] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, the axis of the external connection channel is inclined downward.

[0010] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, the first valve port is arranged at the top of the balance channel, the second valve port is arranged at the bottom of the balance channel, and the diameter of the first valve port is larger than that of the second valve port.

[0011] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, flaring structures are provided on the valve bodies at the first valve port and the second valve port.

[0012] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, the first valve head includes a first main body portion in a fan-shaped structure. An end portion of the first main body portion on the side of the center of the circle is provided with a first hinge member, and the first hinge member is hinged to the valve body. The first main body portion can rotate around the hinge member to open or close the first valve port.

[0013] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, the second valve head includes a second main body portion in a fan-shaped structure. An end portion of the second main body portion on the side of the center of the circle is provided with a second hinge member, and the second hinge member is hinged to the valve body. The second main body portion can rotate around the hinge member to open or close the second valve port.

[0014] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, connecting flanges are provided at the edges of the first valve port and the second valve port, and the connecting flanges are used for fitting and sealing with the corresponding first valve head or the second valve head.

[0015] According to the pressure balance valve for a low-temperature cold storage provided by the present utility model, the parts of the balance channel and the external connection channel located inside the low-temperature cold storage are both coated with heat insulation layers.

[0016] A pressure balance valve for a low-temperature cold storage provided by the present utility model is communicated with the outside through an external connection channel. A first valve port and a second valve port are correspondingly opened at the top and the bottom of the balance channel, and valve heads are provided on both valve ports, so as to automatically balance the internal and external pressure differences through the corresponding valve heads when there is a pressure difference between the inside and the outside. The overall structure is simple and does not require manual or other means for control, the manufacturing and use costs are low, and the internal and external pressure differences can be effectively balanced. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are 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.

[0018] Figure 1 It is a longitudinal sectional structural schematic diagram of the pressure balance valve provided by the present utility model.

[0019] Figure 2 It is a transverse sectional structural schematic diagram of the pressure balance valve provided by the present utility model.

[0020] Reference numerals:

[0021] 1, valve body; 11, balance channel; 12, first valve port; 13, second valve port; 14, external connection channel; 15, connecting flange; 16, flared structure; 2, first valve head; 21, first hinge member; 3, second valve head; 31, second hinge member; 4, external connecting pipe; 5, connecting elbow; 6, outer wall; 7, insulation layer. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model fall within the scope of protection of the present utility model.

[0023] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of clarifying the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0025] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0027] In order to achieve long-term preservation of food or other items, it is usually stored by building a low-temperature freezer (hereinafter simply referred to as a cold storage for convenience). With the development of technology, the cold storage has gradually changed from the traditional civil engineering method to an assembled panel cold storage. Using an assembled panel cold storage requires maintaining the relative sealing of the internal environment to achieve efficient freezing. There is a pressure difference between the internal space of the cold storage and the external environmental space, which makes it difficult to open and close the cold storage door. Especially when the pressure difference is too large, the door may become very difficult to open, which may pose a risk to the safety of the operator and may cause safety accidents. It may also lead to instability of air humidity, thereby affecting the quality of frozen food. For example, too high humidity may cause frosting or freezing damage on the surface of frozen products.

[0028] Regarding the problems in the related art, such as Figure 1 、 Figure 2As shown in the figure, the utility model provides a pressure balance valve for a low-temperature cold storage, which comprises a valve body 1, a first valve head 2 and a second valve head 3. There is a vertically arranged balance channel 11 inside the valve body 1. A first valve port 12 is opened at the top of the valve body 1, and a second valve port 13 is opened at the bottom of the valve body 1. An external connection channel 14 is arranged on the valve body 1 between the first valve port 12 and the second valve port 13. The first valve port 12, the second valve port 13 and the external connection channel 14 are all communicated with the balance channel 11. The first valve head 2 is rotatably arranged at the first valve port 12, and the first valve head 2 is used to cooperate with the first valve port 12 to control the opening or closing of the first valve port 12. The second valve head 3 is rotatably arranged at the second valve port 13 and is located inside the balance channel 11. The second valve head 3 is used to cooperate with the second valve port 13 to control the opening or closing of the second valve port 13. The external connection channel 14 is used to communicate with the outside to balance the internal and external pressures. When balancing the pressures inside and outside the cold storage, it is necessary to connect the inside and the outside to achieve balance. While in the normal state, it is necessary to isolate the internal environment of the cold storage from the external environment to ensure the cooling efficiency inside the cold storage. In this embodiment, by correspondingly arranging valve heads at the first valve port 12 and the second valve port 13, the balance of the internal and external pressures in different scenarios is achieved, and the overall structure is simple, easy to manufacture, and the overall cost is lower.

[0029] When balancing the air pressure, there are two scenarios. The first scenario is during the cooling process of the cold storage. When the external pressure is higher than the internal pressure of the cold storage, the high-pressure gas in the external high-pressure environment is transmitted to the balance channel 11 through the external connection channel 14. At this time, due to the external pressure being greater than the internal pressure, the second valve head 3 is pressed and fitted at the position of the second valve port 13 under its own gravity and the external air pressure, and the second valve port 13 is in a closed state, and the second valve port 13 will not convect and exchange with the external high-pressure gas. At the same time, the high-pressure gas exerts an upward lifting force on the first valve head 2. When the lifting force is greater than the weight of the first valve head 2 itself, the first valve head 2 can be rotated to disengage from the fit with the first valve port 12, and the first valve port 12 is opened, so that the external high-pressure gas convects and exchanges with the gas inside the cold storage to achieve pressure balance. When the pressure is balanced, no upward lifting force is generated on the first valve head 2 in the balance channel 11. At this time, the first valve head 2 can close the first valve port 12 under its own gravity.

[0030] In Scenario 2, when the internal pressure is higher than the external pressure during the temperature rise process of the cold storage, the internal environment of the cold storage is a high-pressure environment at this time, and the external environment is a low-pressure environment. At this time, the first valve head 2 fits tightly against the first valve port 12 under the action of the internal pressure and its own gravity, so that the first valve port 12 is in a closed state, and there will be no gas convection and exchange between the first valve port 12 and the external environment. At the same time, the high-pressure gas exerts an upward lifting force on the second valve head 3. When the lifting force is greater than the weight of the second valve head 3 itself, it can cause the second valve head 3 to rotate and disengage from the second valve port 13, and the second valve port 13 opens, so that a large amount of convection and exchange occurs between the internal high-pressure gas and the external gas, achieving pressure balance. When the pressure balance is achieved, the pressure difference inside and outside disappears. At this time, the second valve head 3 fits against the second valve port 13 again and closes under the action of its own gravity. It can be seen from this that in this embodiment, when balancing the internal and external pressures in different scenarios, one of the first valve port 12 and the second valve port 13 will open, which can automatically achieve the balance of the internal and external pressure differences and the closing of the balance channel 11. The overall structure is simple and easy to prepare.

[0031] In a specific example, the first valve head 2 and the second valve head 3 have a similar structure, both forming a main body structure with a "sector-shaped" longitudinal section, and the sealing of their respective valve ports is achieved through the sector-shaped main body structure. Moreover, the sector-shaped structure is convenient for controlling its own weight and is conducive to rotating back to the original position after the air pressure is balanced. That is, the edges of the first valve head 2 and the second valve head 3 on the side of the center of the circle are rotationally connected to the valve body 1. After the air pressure is balanced, the overall center of gravity is downward, realizing the rapid rotation of the valve head to close the valve port.

[0032] When specifically setting, as Figure 1 shown, the overall structure of the valve body 1 is a columnar structure. The balance channel 11 is opened along the central axis direction of the columnar valve body 1, and the external connection channel 14 is opened along one side of the valve body 1 and an opening is provided on the side wall of the valve body 1 to communicate with the external environment. Specifically, the setting of the opening can facilitate the connection with the external environment. Specifically, when connecting, it is connected to the external environment through a pipeline to achieve the pressure balance between the external environment and the internal environment of the cold storage.

[0033] According to an embodiment of the present invention, the first valve port 12 is located at the top of the balance channel 11, the second valve port 13 is located at the bottom of the balance channel 11, and the diameter of the first valve port 12 is larger than the diameter of the second valve port 13. For the convenience of preparing the valve body 1, in this embodiment, the two valve ports are correspondingly opened at the top and bottom of the balance channel 11, realizing the efficient setting of the valve ports.

[0034] It can be understood that the balance channel 11 is a vertical channel. Its first valve port 12 is located at the top of the main body of the valve body 1, and the second valve port 13 is located at the bottom of the main body of the valve body 1. The balance channel 11 is between the two. This setting method can cleverly achieve the air pressure balance with the inside of the cold storage when the internal and external pressure differences change, and the self-weight of the valve heads on their respective valve ports is utilized as a whole to achieve automatic adjustment.

[0035] In addition, in this embodiment, the caliber of the first valve port 12 is set to be larger than that of the second valve port 13. This enables the air pressure in the balance channel 11 to have a larger contact area with the first valve head 2 when the external pressure is greater than the internal pressure of the cold storage, realizing the rapid lifting of the first valve head 2 and achieving air pressure balance.

[0036] Specifically, the first valve head 2 includes a first main body portion with a fan-shaped structure. One end of the first main body portion on the side of the center of the circle is provided with a first hinge 21. The first hinge 21 is hinged to the valve body 1, and the first main body portion can rotate around the hinge to open or close the first valve port 12. The fan-shaped structure of the first main body portion enables the side wall surface formed by one side of its radius to cooperate with the first valve port 12 to close or open the first valve port 12.

[0037] It can be understood that the main body of the first valve head 2 has a fan-shaped structure, which has a side on the center of the circle and a radius side radiating from the center of the circle. The side on the center of the circle and the radius side are connected and gradually spread to form a fan-shaped structure. In the normal state (when not in the pressure adjustment state), it is necessary to ensure the closed state at the first valve port 12. In this embodiment, the side wall on one side of the radius of the first main body portion is the first fitting surface, and the first valve port 12 is covered through the first fitting surface. That is, in the normal state, the first fitting surface is in sealing contact with the edge of the first valve port 12 to ensure efficient cooling in the cold storage.

[0038] In some examples, the top surface of the valve body 1 connected to the first valve port 12 can be a horizontal plane. The first valve port 12 is opened on the plane of the top surface. The setting of the horizontal plane is beneficial to the installation of the first valve head 2. Specifically, when installing, the first valve head 2 is rotatably arranged on one side of the edge of the first valve port 12 on the side of the center of the circle, so that the first valve head 2 can rotate around the rotation setting point and can cover the first valve port 12.

[0039] In other examples, flared structures 16 are provided on the valve body 1 at both the first valve port 12 and the second valve port 13. The flared structures 16 make the parts of the valve body 1 at the first valve port 12 and the second valve port 13 form a structure similar to a funnel, which is convenient for the installation of the valve head.

[0040] It can be understood that the height of the balance channel 11 is less than the overall height of the columnar valve body 1, which results in a solid structure of the valve body 1 both above the first valve port 12 and at the bottom of the second valve port 13. In this embodiment, the structure of the valve body 1 above the first valve port 12 forms a flared structure 16 similar to a funnel, which can facilitate the rotation of the first valve head 2 and can open or close the first valve port 12 through the rotation of the first valve head 2.

[0041] In specific applications, the first valve head 2 is made of a low-temperature resistant rigid plastic. The setting of the rigid plastic can facilitate molding and processing and reduce the overall production cost.

[0042] In some embodiments, the maximum outer diameter of the second valve head 3 is less than the diameter of the first valve port 12. The main body part of the second valve head 3 is located in the balance channel 11, and it can close the second valve port 13 when the external air pressure is relatively high. To facilitate the installation of the second valve head 3, in this embodiment, the diameter of the first valve port 12 is set larger than that of the second valve head 3, so that the second valve head 3 can be integrally installed on the second valve port 13 from the first valve port 12 during installation, realizing convenient installation.

[0043] In a specific example, a flared structure 16 is also provided on the valve body 1 at the bottom of the second valve port 13. The flared structure 16 can facilitate the contact between the high-pressure gas inside and the second valve head 3, realize the lifting of the second valve head 3, and thus achieve the pressure balance between the inside and outside of the cold storage.

[0044] According to the specific embodiments provided by the present invention, the second valve head 3 includes a second main body part in a fan-shaped structure. An end of the second main body part on the side of the center of the circle is provided with a second hinge 31, and the second hinge 31 is hinged to the valve body 1. The second main body part can rotate around the hinge to open or close the second valve port 13. The overall structure of the second valve head 3 is the same as that of the first valve head 2, and both form a structure similar to a fan shape through the main body structure. Among them, the second hinge 31 is connected to the center side of the second main body part. In this embodiment, by limiting the structure of the second valve head 3, the high-pressure gas in the cold storage can be used to push the second valve head 3 to rotate, realizing the opening and closing of the second valve port 13.

[0045] It can be understood that when the internal pressure is higher than the external pressure, the internal air pressure can push the second valve head 3 to rotate, so that the second fitting surface on the second valve head 3 rotates away from the valve body 1, thereby realizing the flow exchange between the internal high-pressure gas and the external gas and achieving pressure balance.

[0046] Such as Figure 1As shown, in some other examples, the bottom surface of the balance channel 11 is an inclined slope structure. At this time, the balance channel 11 as a whole has a right trapezoidal structure, and the second valve head 3 is installed obliquely as a whole. This enables the second valve head 3 to be closely and stably attached to the second valve port 13, realizing the opening and closing of the second valve port 13. This method is conducive to the discharge of condensed water in the balance channel 11 and avoids the deposition of condensed water.

[0047] During specific settings, connection flanges 15 are provided at both the first valve port 12 and the second valve port 13. The connection flanges 15 are used to contact the corresponding valve heads, making the fit closer when the corresponding valve ports are closed. The connection flanges 15 are provided on the edge of the second valve port 13 and the first valve port 12 in a circle, so that when the first valve head 2 and the second valve head 3 perform sealing respectively, the fitting surfaces of their respective valve heads are in contact with the connection flanges 15 to realize the closing of the valve ports.

[0048] In specific applications, both the first hinge member 21 and the second hinge member 31 are connected by a hinge structure. One end of the hinge is connected to one side of the center of the respective valve head, and the other end of the hinge is connected to the valve head, enabling the respective valve heads to rotate around the hinge.

[0049] It should be understood that in the foregoing embodiments, during the process of balancing the air pressure, the first valve head 2 and the second valve head 3 are both located within their respective valve ports. Because during the process of balancing the air pressure, once the first valve head 2 and the second valve head 3 open their respective valve ports, the air pressure balance can be achieved. At this time, the valve heads within their respective valve ports can rotate a certain angle under the action of the hinge members, thereby realizing the gas exchange inside and outside. And through the flared structure 16 of the respective valve ports, the rotation angle of each valve head can be limited, thereby preventing the valve head from being unable to return to the closed state after rotation.

[0050] In an embodiment provided by the present invention, the axis of the external connection channel 14 is inclined downward. The external connection channel 14 is communicated with the balance channel 11 to be able to communicate with the external air pressure. Through the inclined downward setting of the axis, the external connection channel 14 is convenient for discharging condensed water.

[0051] During specific settings, the axis of the external connection channel 14, that is, the extension direction of the external connection channel 14, can facilitate the timely discharge of condensed water through the inclined downward method and avoid the deposition of condensed water.

[0052] In the specific implementation manner provided by the present invention, the pressure balance valve further includes an external connection pipe 4. One end of the external connection pipe 4 is connected to the external connection channel 14, and the other end of the external connection pipe 4 is located outside the low-temperature cold storage for communicating with the outside. The external connection pipe 4 is a pipe structure as a whole, which can realize the circulation and exchange of external gas and the gas inside the cold storage and achieve the balance of internal and external air pressure.

[0053] In some embodiments, in the cold storage balance system, the valve body 1 is provided on the outer wall 6 through a fixed connecting member. Specifically, the fixed connecting member includes a Ω-shaped fixing piece, which can surround the valve body 1 and fix the valve body 1 on the outer wall 6. A perforation is processed on the outer wall 6, and one end of the external connecting pipe 4 passes through the perforation and is located outside the outer wall 6, so as to achieve communication with the outside.

[0054] When specifically arranged, the external connecting pipe 4 is arranged obliquely downward, and a connecting elbow 5 is provided at the port of the external connecting pipe 4. The external connecting pipe 4 being arranged obliquely downward is beneficial to the discharge of condensed water.

[0055] Among them, the slope of the external connecting pipe 4 arranged obliquely is the same as the slope of the external connecting channel 14, which is beneficial to the discharge of condensed water.

[0056] In specific applications, the setting of the connecting elbow 5 can reduce the occurrence of the phenomenon of condensed water pouring on the wall.

[0057] In the specific embodiments provided by the present utility model, the parts of the balance channel 11 and the external connecting channel 14 located inside the low-temperature cold storage are both coated with a heat preservation layer 7. The setting of the heat preservation layer 7 can reduce the loss of cold quantity and the occurrence of frosting phenomenon.

[0058] Specifically, the heat preservation material can be common heat preservation materials such as polystyrene foam and polyurethane foam. Using common heat preservation materials can be easily obtained and can reduce the overall production cost.

[0059] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment is connected to the outside through the external connecting channel 14, the external connecting channel 14 is connected to the balance channel 11, the first valve port 12 and the second valve port 13 are correspondingly provided at the top and bottom of the balance channel 11, and valve heads are provided on both valve ports, so as to automatically balance the internal and external pressure differences through the corresponding valve heads when there is a pressure difference between the inside and the outside. The overall structure is simple and does not require manual or other means for control, with low production and use costs, and can effectively achieve the balance of the internal and external pressure differences. When the cold storage needs to be rapidly cooled due to business reasons, it can reduce or even avoid the occurrence of problems such as the bulging of the wall and floor heat preservation layer and the sagging of the assembly board ceiling. Further, the parts of the balance channel 11 and the external connecting channel 14 located inside the low-temperature cold storage are both coated with heat preservation materials, reducing the loss of cold quantity and the occurrence of frosting phenomenon. Further, by setting the first valve head 2 and the second valve head 3 at the upper and lower ends of the balance channel 11, there is no need to manually open and close, and there is no possibility of manual operation errors and forgetting, improving the overall safety. After adopting the pressure balance valve of the above example, the temperature rise and fall time of the cold storage can be shortened by 1 / 3 to 1 / 2, and the economic benefits during the cooling period can be increased by 30% to 50%. At the same time, since the valve does not require manual operation, the labor intensity of the cold storage management personnel is reduced.

[0060] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure balance valve for a low-temperature cold storage, characterized in that, Comprising: A valve body, a first valve head and a second valve head; A vertically arranged balance channel is provided inside the valve body. A first valve port is opened at the top of the valve body, and a second valve port is opened at the bottom of the valve body. An external connection channel is provided on the valve body between the first valve port and the second valve port. The first valve port, the second valve port and the external connection channel are all communicated with the balance channel; The first valve head is rotatably arranged at the first valve port and is used to cooperate with the first valve port to control the opening or closing of the first valve port. The second valve head is rotatably arranged at the second valve port and is located inside the balance channel. The second valve head is used to cooperate with the second valve port to control the opening or closing of the second valve port. The external connection channel is used to communicate with the outside to balance the internal and external pressures.

2. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that, The balance valve further includes an external connecting pipe. One end of the external connecting pipe is connected to the external connection channel, and the other end of the external connecting pipe is located outside the low-temperature cold storage for communicating with the outside.

3. The pressure balance valve for a low-temperature cold storage according to claim 2, wherein The external connecting pipe is arranged obliquely downward, and a connecting elbow is provided at the port of the external connecting pipe.

4. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that, The axis of the external connection channel is arranged obliquely downward.

5. The pressure balance valve for a low-temperature cold storage according to claim 1, wherein The first valve port is arranged at the top of the balance channel, the second valve port is arranged at the bottom of the balance channel, and the diameter of the first valve port is larger than that of the second valve port.

6. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that Flared structures are provided on the valve body at the first valve port and the second valve port.

7. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that, The first valve head includes a first main body portion in a fan-shaped structure. A first hinge member is provided at the end of the first main body portion on the side of the center of the circle. The first hinge member is hinged to the valve body, and the first main body portion can rotate around the hinge member to open or close the first valve port.

8. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that, The second valve head includes a second main body portion in a fan-shaped structure. A second hinge member is provided at the end of the second main body portion on the side of the center of the circle. The second hinge member is hinged to the valve body, and the second main body portion can rotate around the hinge member to open or close the second valve port.

9. The pressure balance valve for a low-temperature cold storage according to claim 8, characterized in that, Connection flanges are provided at the edges of the first valve port and the second valve port, and the connection flanges are used to fit and seal with the corresponding first valve head or second valve head.

10. The pressure balance valve for a low-temperature cold storage according to claim 1, characterized in that, The parts of the balance channel and the external connection channel located inside the low-temperature cold storage are both coated with a heat-insulating layer.

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