Balancing valve assembly for a refrigeration appliance and refrigeration appliance

Abstract

This application relates to the field of refrigeration equipment technology, and discloses a balancing valve assembly for refrigeration equipment. The refrigeration equipment includes a housing, and the balancing valve assembly includes: a valve body for mounting in the housing, the valve body having a channel connecting the interior of the housing with the outside air; a movable member disposed in the channel, and the movable member being movable relative to the valve body between a closed position and an open position; and an elastic reset member disposed between the movable member and the valve body, and the elastic reset member being located outside the housing; wherein, when the movable member is in the closed position, the channel is closed; when the movable member moves relative to the valve body toward the interior of the housing to the open position, the channel is opened to balance the internal and external air pressure, and the elastic reset member is compressed to drive the movable member to reset from the open position to the closed position. This ensures the normal operation of the air pressure balancing function while effectively preventing low-temperature failure of the elastic reset member. This application also discloses a refrigeration device.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, specifically to a balance valve assembly for refrigeration equipment and refrigeration equipment. Background Technology

[0002] Currently, during the use of refrigeration equipment such as low-temperature storage boxes and freezers, the air inside the box contracts due to the cold after the door is closed, resulting in a pressure difference (negative pressure) between the inside and outside of the box, which makes it difficult to open the door and takes a long time to open it again.

[0003] The related technology discloses a balancing valve device for balancing the internal and external air pressure of a freezer. The freezer includes a shell and an inner liner. A detachable balancing valve device is installed on the shell, connecting the shell and the inner liner. The balancing valve device includes a balancing valve body, which includes a balancing hole button for manually balancing the pressure difference between the inside and outside of the freezer, a balancing hole knob, a sealing plug, and a spring. One side of the sealing plug is fixedly connected to the balancing hole button, and the other side is connected to the balancing hole knob. The spring is sleeved on the balancing hole button, and the position of the sealing plug is controlled by the extension and contraction of the spring, thereby achieving pressure balance between the inside and outside of the freezer.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: In related technologies, after long-term use, frost will condense on the surface of the spring, causing the elastic force to weaken or become stuck, which seriously affects the automatic reset function and sealing performance of the balance valve.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a balance valve assembly for a refrigeration device and a refrigeration device to prevent the elastic reset element from failing due to icing.

[0008] According to a first aspect of the present invention, a balancing valve assembly for a refrigeration device is provided. The refrigeration device includes a housing. The balancing valve assembly includes: a valve body for mounting in the housing, the valve body having a channel communicating air between the interior of the housing and the exterior of the housing; a movable member disposed in the channel and movable relative to the valve body between a closed position and an open position; and an elastic reset member disposed between the movable member and the valve body, the elastic reset member being located outside the housing. When the movable member is in the closed position, the channel is closed; when the movable member moves relative to the valve body toward the interior of the housing to the open position, the channel is opened to balance the internal and external air pressures, and the elastic reset member is compressed to drive the movable member to reset from the open position to the closed position.

[0009] According to a second aspect of the present invention, a refrigeration device is provided, comprising: a housing having an opening communicating between the interior and exterior of the housing; and a balance valve assembly for the refrigeration device as described in any of the above-disclosed embodiments, disposed in the opening.

[0010] The balancing valve assembly and refrigeration equipment for refrigeration equipment provided in this disclosure can achieve the following technical effects: By placing the elastic reset component in the ambient temperature environment outside the enclosure, specifically at the front end of the valve body near the outer side of the enclosure, the elastic reset component is physically isolated from the low-temperature environment inside the enclosure, effectively preventing icing caused by low temperatures. This ensures the normal operation of the pressure balancing function while effectively preventing low-temperature failure of the elastic reset component, improving the long-term reliability of the balancing valve assembly under low-temperature conditions. Furthermore, since there is no need to add auxiliary anti-freezing devices such as electric heating wires, it also reduces overall energy consumption and manufacturing costs, and eliminates potential electrical safety hazards.

[0011] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of the assembly of a balance valve assembly and a housing provided in an embodiment of this disclosure; Figure 2 This is an exploded view of a balance valve assembly assembled with a housing according to an embodiment of this disclosure; Figure 3 This is a cross-sectional structural diagram of a balance valve assembly assembled with a housing according to an embodiment of this disclosure, wherein the moving part is located in the closed position; Figure 4This is a cross-sectional structural diagram of another balance valve assembly assembled with a housing according to an embodiment of this disclosure, wherein the moving part is located in the open position; Figure 5 This is a cross-sectional structural schematic diagram of another balance valve assembly assembled with a housing according to an embodiment of this disclosure; Figure 6 This is a cross-sectional structural schematic diagram of another balance valve assembly assembled with a housing according to an embodiment of this disclosure; Figure 7 yes Figure 6 An enlarged schematic diagram of part A shown; Figure 8 This is a schematic diagram of the structure of a pre-embedded pipe provided in an embodiment of this disclosure; Figure 9 This is a schematic diagram of the structure of a valve body provided in an embodiment of this disclosure; Figure 10 This is an exploded view of a balance valve assembly provided in an embodiment of this disclosure.

[0013] Figure label: 10: Valve body; 11: Channel; 12: Embedded part; 121: Inner cavity; 122: Positioning part; 123: Rib; 124: Guide space; 13: Extension part; 131: First groove; 132: Anti-slip structure; 14: Support surface; 20: Moving part; 21: Button; 211: Air hole; 22: Rear plug; 221: Conical part; 222: Connecting part; 223: Mounting part; 224: Second groove; 225: Tool mating hole; 30: Elastic reset part; 31: Spring; 40: First embedded tube; 41: First limiting part; 411: First chamfer; 42: First snap-fit ​​part; 421: First snap-fit ​​structure; 422: First snap-fit ​​surface; 423: First guide slope ; 43: First embedded part; 431: First through hole; 44: First extension part; 50: Second embedded pipe; 51: Second limiting part; 511: Second chamfer; 52: Second snap-fit ​​part; 521: Second snap-fit ​​structure; 522: Second guide slope; 523: Second snap-fit ​​surface; 53: Second embedded part; 531: Second through hole; 54: Second extension part; 60: Connecting pipe; 70: First sealing gasket; 80: Second sealing gasket; 90: Box body; 91: Box shell; 911: First snap-fit ​​mating part; 912: First bayonet; 92: Inner liner; 921: Second snap-fit ​​mating part; 922: Second bayonet; 93: Foaming space; 100: Mounting hole; 101: Test hole. Detailed Implementation

[0014] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0015] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0016] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0017] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0018] Unless otherwise stated, the term "multiple" means two or more.

[0019] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0020] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0022] In existing refrigeration equipment's balance valve devices, the elastic reset element and sealing element are typically installed inside the valve body, which is entirely embedded in the foam layer of the housing. This layout is compact, provides direct transmission, and is a conventional design in the field. When the elastic reset element fails due to low-temperature freezing, the conventional solution for those skilled in the art is to add auxiliary components without altering the existing structure, such as wrapping an electric heating wire around the outside of the ventilation channel for active heating and freeze protection. This solution has low development risk and a short verification cycle, and is therefore widely adopted. However, adding an electric heating wire presents problems such as high energy consumption, increased cost, and electrical safety hazards. This application provides an improved balance valve assembly that can effectively prevent the elastic reset element from failing due to low-temperature freezing without the need for active freeze protection methods such as electric heating.

[0023] Combination Figure 1-10 As shown, this embodiment of the present disclosure provides a balance valve assembly for a refrigeration device. The refrigeration device includes a housing 90. The balance valve assembly includes a valve body 10, a movable member 20, and an elastic reset member 30. The valve body 10 is installed on the housing 90 and has a channel 11 that connects the interior of the housing 90 with the air outside the housing 90. The movable member 20 is disposed in the channel 11 and is movable relative to the valve body 10 between a closed position and an open position. The elastic reset member 30 is disposed between the movable member 20 and the valve body 10 and is located outside the housing 90. When the movable member 20 is in the closed position, the channel 11 is closed. When the movable member 20 moves relative to the valve body 10 toward the interior of the housing 90 to the open position, the channel 11 is opened to balance the internal and external air pressures, and the elastic reset member 30 is compressed to drive the movable member 20 to reset from the open position to the closed position.

[0024] The refrigeration equipment described in this embodiment includes a housing 90, which comprises a shell 91 and an inner liner 92. A foaming space 93 is provided between the shell 91 and the inner liner 92. This foaming space 93 is filled with foaming material to form a foam layer for insulation. A balance valve assembly is installed on the housing 90 to balance the pressure difference between the inside of the housing 90 and the outside atmosphere, facilitating easy opening of the door.

[0025] The valve body 10 has a channel 11 connecting the interior of the housing 90 with the external air. This channel 11 provides a dedicated airflow path for pressure balancing, allowing external air to quickly enter the housing 90 when needed. The specially designed channel 11 effectively improves the controllability and efficiency of air intake. When negative pressure is generated inside and outside the housing 90, the channel 11 guides external air in a directional flow with minimal flow resistance, avoiding localized temperature fluctuations caused by irregular airflow diffusion within the housing 90. Simultaneously, the channel 11 is located inside the dedicated valve body 10, isolated from the foam layer and insulation structure of the housing 90, thus preserving its insulation performance. Furthermore, as an independent component, the valve body 10 allows for precise pre-processing of parameters such as the inner diameter and surface roughness of the channel 11, ensuring smooth and consistent airflow and avoiding airflow problems caused by manufacturing tolerances in the housing 90. This channel 11 structure provides a reliable structural foundation for rapid and controllable pressure balancing.

[0026] The movable element 20 is located within the channel 11 and can move relative to the valve body 10 between a closed position and an open position. This design enables the on-demand activation of the air pressure balancing function. The movable element 20 can be manually pressed or moved automatically under the drive of air pressure difference.

[0027] In manual air intake mode, the user can directly press the movable component 20, causing it to move inwards towards the housing 90. This releases the seal between the rear end of the movable component 20 and the inner end of the valve body 10, opening the channel 11. External air then enters the housing 90 through the air hole 211 and the channel 11, achieving rapid air pressure balance. When the user releases button 21, the elastic reset component 30 drives the movable component 20 to automatically return to the closed position. This method is suitable for scenarios requiring active and rapid air pressure balance. For example, if a user finds the door difficult to open, pressing button 21 instantly balances the internal and external air pressure, allowing the door to open easily and significantly reducing the time required for secondary opening.

[0028] In automatic air intake mode, when the pressure difference between the inside and outside of the cabinet 90 reaches a certain threshold, the thrust generated by the pressure difference is sufficient to overcome the preload of the elastic reset component 30, directly pushing the moving component 20 towards the inside of the cabinet 90, automatically opening the channel 11 and allowing external air to enter the cabinet 90 to achieve pressure balance. Once the pressure difference decreases below the threshold, the elastic reset component 30 drives the moving component 20 to automatically reset to the closed position. This method is suitable for environments where temperature uniformity within the cabinet is not critical, such as conventional freezers, automatically maintaining pressure balance without manual intervention, thus improving ease of use.

[0029] The switching between the two driving modes depends on the pre-compression setting of the elastic reset element 30. When the pre-compression of the elastic reset element 30 is small, a small air pressure difference is enough to automatically open the moving part 20, and the balance valve assembly mainly operates in automatic drive mode. When the pre-compression of the elastic reset element 30 is large, a larger thrust is required to overcome the preload. In this case, manual pressing by the user becomes the main opening method, which can avoid frequent automatic opening due to small air pressure fluctuations, thereby reducing disturbance to the internal temperature of the chamber.

[0030] When in the closed position, the movable component 20 seals the channel 11, ensuring the airtightness of the enclosure 90 during daily use, preventing cold air leakage and the entry of hot and humid external air, thereby maintaining a stable low-temperature environment inside the enclosure and reducing energy consumption. When pressure balancing is required, the movable component 20 moves to the open position, opening the channel 11 and allowing external air to enter. This position switching mechanism ensures that the balancing valve assembly only opens when necessary, avoiding disturbances to the internal temperature caused by continuous ventilation. The movement of the movable component 20, driven by human intervention or pressure difference, ensures rapid response while avoiding unnecessary repetitive actions. The fit clearance between the movable component 20 and the channel 11 is optimized to ensure smooth movement while forming a reliable seal with the sealing structure when closed.

[0031] The elastic reset member 30 is disposed between the moving member 20 and the valve body 10, and is also located within the channel 11 of the valve body 10. The front end of the valve body 10, i.e., the end facing the outside of the housing 90, protrudes from the outer surface of the housing 90, forming an extension 13. The channel 11 section of this extension 13 is located outside the housing 90. Since the elastic reset member 30 is disposed within the channel 11 of this extension 13, although it is located inside the channel 11, it is essentially in a normal temperature environment outside the housing 90. By placing the elastic reset member 30 outside the housing 90, it is always kept in a normal temperature environment outside the housing 90, and is physically isolated from the low-temperature air inside the housing 90 through a sealing structure. This prevents the risk of failure of the elastic reset member 30 due to icing, eliminating the need for active antifreeze measures such as electric heating, thus reducing energy consumption and eliminating electrical safety hazards. Meanwhile, since the elastic reset component 30 is located on the outside, it is easy to maintain and replace, and can be inspected without disassembling the housing 90.

[0032] An elastic reset member 30 is disposed between the movable member 20 and the valve body 10, with its two ends abutting against the movable member 20 and the valve body 10, respectively. When the movable member 20 moves toward the interior of the housing 90 to the open position, the elastic reset member 30 is compressed between the movable member 20 and the valve body 10, undergoing elastic deformation and storing energy. When the external force acting on the movable member 20 is removed and the air pressure inside and outside the housing 90 reaches equilibrium, the elastic reset member 30 releases the stored energy, automatically driving the movable member 20 to reset to the closed position.

[0033] When the movable component 20 is in the closed position, the channel 11 is closed; when the movable component 20 moves towards the interior of the housing 90 to the open position, the channel 11 is opened, and the elastic reset component 30 is compressed; the elastic reset component 30 is used to drive the movable component 20 to reset from the open position to the closed position. This working logic realizes automated closed-loop control of air pressure balance. When the user presses the movable component 20 (or the air pressure difference automatically pushes the movable component 20), the channel 11 opens, and outside air quickly enters the housing to eliminate negative pressure; at the same time, the elastic reset component 30 is compressed and stores energy. When the user releases the pressure (or after the internal and external air pressures are balanced), the elastic reset component 30 releases the stored energy, automatically pushing the movable component 20 back to the closed position, restoring the sealing state. This process does not require the user to perform any additional reset operation, making it simple and reliable to use. This automatic reset function effectively improves the user experience and shortens the waiting time for secondary opening. In addition, the reset force of the elastic reset component 30 can be selected according to actual needs to ensure sufficient sealing pressure in the closed position, preventing accidental opening due to vibration or small pressure differences.

[0034] The balance valve assembly for refrigeration equipment provided in this embodiment of the invention, by arranging the elastic reset member 30 in the ambient temperature environment outside the housing 90 and at the front end of the valve body 10 near the outer side of the housing 90, physically isolates the elastic reset member 30 from the low-temperature environment inside the housing 90, thereby effectively preventing icing due to low temperatures. This ensures the normal operation of the pressure balance function while effectively preventing low-temperature failure of the elastic reset member 30, improving the long-term reliability of the balance valve assembly under low-temperature conditions. Furthermore, since there is no need to add auxiliary anti-freezing devices such as electric heating wires, it also reduces overall energy consumption and manufacturing costs, and eliminates electrical safety hazards.

[0035] Optionally, combined Figure 3 As shown, the elastic reset element 30 is a spring 31.

[0036] The elastic reset element 30 can be a helical spring 31, with the axis of the helical spring 31 in the same direction as the movement of the moving element 20. The helical spring 31 is low in cost, long in life, and easy to install. The wire diameter, number of turns, and material of the spring 31 can be selected according to the required reset force. For example, for a -80℃ cryogenic storage box, a low-temperature resistant stainless steel spring 31 can be used.

[0037] For example, combined Figure 5As shown, an annular receiving space is formed between the outer peripheral surface of the movable part 20 and the inner wall of the channel 11 of the valve body 10. The helical spring 31 is sleeved on the radially outer side of the movable part 20, that is, the helical spring 31 surrounds the outside of the movable part 20. One end of the helical spring 31 abuts against the flange or stepped surface provided on the movable part 20, and the other end abuts against the abutting surface provided on the inner wall of the channel 11 of the valve body 10. When the movable part 20 moves toward the inside of the housing 90, the flange on the movable part 20 compresses the helical spring 31, so that the helical spring 31 is compressed between the movable part 20 and the valve body 10; when the external force is removed or the air pressure difference is balanced, the helical spring 31 extends, pushing the movable part 20 to return to its original position. The helical spring 31 is located on the outside of the movable part 20 and does not occupy the axial length of the movable part 20, which is beneficial to shortening the overall structural size. At the same time, the helical spring 31 is coaxially arranged with the movable part 20, so the force is uniform and the movement is smooth. In addition, the helical spring 31 is sleeved on the outside of the movable part 20, which facilitates observation and replacement.

[0038] The elastic reset element 30 can also be a spring sheet or an elastic rubber body, as long as it can provide a reset force.

[0039] In another example, the elastic reset member 30 can also directly abut against the moving member 20 and the valve body 10, that is, one end of the elastic reset member 30 directly abuts against the rear end face of the moving member 20, with the rear end face facing the interior of the housing 90, and the other end abuts against the abutment surface inside the channel 11 of the valve body 10. When the moving member 20 moves toward the interior of the housing 90, the rear end face of the moving member 20 directly compresses the elastic reset member 30; during reset, the elastic reset member 30 directly pushes the rear end face of the moving member 20 to return it.

[0040] Regardless of the arrangement method used, the elastic reset member 30 is located within the channel 11 of the valve body 10. However, since this channel section is located in the extension 13 of the valve body 10 protruding from the surface of the housing 90, the elastic reset member 30 is essentially in the normal temperature environment outside the housing 90, isolated from the low-temperature air inside the housing 90 by a sealing structure. In this way, the elastic reset member 30 can reliably drive the moving member 20 to reset, while avoiding elasticity attenuation or jamming failure caused by low-temperature freezing.

[0041] Optionally, combined Figure 3-5 and Figure 10As shown, the movable component 20 includes a button 21 and a rear plug 22. The button 21 is located at the end of the channel 11 facing the outside of the housing 90, and the button 21 has an air hole 211 communicating with the channel 11. The first end of the rear plug 22 is connected to the button 21, and the second end of the rear plug 22 is located at the end of the channel 11 facing the inside of the housing 90. When the movable component 20 is in the closed position, the second end of the rear plug 22 is sealed with the inner end of the valve body 10 to block the channel 11. When the movable component 20 moves toward the open position, the second end of the rear plug 22 is released from the sealing engagement with the inner end of the valve body 10, so that external air enters the housing 90 through the air hole 211 and the channel 11 in sequence.

[0042] Button 21 is mounted on the end of channel 11 facing the outside of housing 90, and at least part of button 21 is exposed outside housing 90 for easy finger pressing operation. Button 21 has an air hole 211 communicating with channel 11, thereby forming an external air intake passage. When the movable part is in the open position, the external airflow flows from the outside of housing to the inside of housing in the following direction: Figure 4 As shown. To improve the pressing feel, the outer circumference of button 21 can be provided with anti-slip texture. A hexagonal groove can also be provided at the center of the outer end face of button 21, which can be turned with an Allen wrench to adjust the pressing force or to disassemble or assemble the entire valve body 10. The hexagonal groove can also be used as a force application point for the disassembly and assembly tools. The inner circumference of button 21 is provided with a stop surface to abut one end of the elastic reset member 30, so that the elastic reset member 30 is stably compressed during the pressing process.

[0043] The first end of the rear plug 22 is connected to the button 21, and the second end of the rear plug 22 is located at the end of the channel 11 facing the interior of the housing 90. The rear plug 22 and the button 21 are coaxially connected and together form a movable component 20. When the movable component 20 is in the closed position, the second end of the rear plug 22 is sealed to the inner end face of the valve body 10 near the interior of the housing 90, completely blocking the channel 11. When an external force drives the movable component 20 to the open position, the second end of the rear plug 22 disengages from the inner end face of the valve body 10, releasing the seal, and external air can then enter the interior of the housing 90 through the air hole 211 and the channel 11.

[0044] In actual use, when the user presses the exposed button 21, the button 21 simultaneously moves the rear plug 22 axially into the housing 90 to the open position, opening the channel 11 and allowing external air to flow into the housing 90 quickly, balancing the air pressure inside and outside the housing 90 and significantly shortening the waiting time for the housing 90 to open again. After the user releases the button 21, the elastic reset component 30 releases its stored elastic potential energy, causing the moving component 20 to reset in the opposite direction, and the rear plug 22 re-seales against the inner end face of the valve body 10, restoring the channel 11 to its sealed state.

[0045] By integrating the pressing operation and sealing opening / closing function onto the same moving part 20, the user can actively balance the pressure difference inside and outside the box with a simple press. The structure of the button 21 with the integrated air hole 211 ensures unobstructed air intake, and the plug 22 and the inner end of the valve body 10 adopt a planar sealing fit, resulting in a simple overall structure and stable sealing performance.

[0046] It is understood that the movable part 20 is not limited to being assembled from two independent parts, button 21 and rear plug 22. It can also adopt an integrally molded push rod structure, with a pressing head at the front end of the push rod and an integrally molded sealing head at the rear end. A spring 31 seat is reserved in the middle section of the push rod for assembling the elastic reset part 30.

[0047] Optionally, combined Figure 1 and Figure 2 As shown, there are multiple air holes 211, which are evenly arranged along the circumference of the button.

[0048] The button has vents that connect to the channel, creating an air intake path for external air to enter the housing. The use of multiple circumferentially distributed vents increases the intake cross-sectional area, reduces airflow resistance, and allows external air to enter the valve body channel more quickly and evenly, thus shortening the pressure equalization time. Simultaneously, the circumferentially distributed design avoids airflow deflection or radial impact on moving parts caused by unilateral air intake, ensuring the smooth movement of the moving parts.

[0049] Optionally, combined Figure 3 As shown, button 21 and rear plug 22 are detachably connected by threads. By adjusting the threaded connection length between button 21 and rear plug 22, the pre-compression amount of elastic reset member 30 can be changed to adjust the pressing force.

[0050] Button 21 and rear plug 22 are detachably connected by threads. One of the first ends of the rear plug 22 and button 21 has an internal thread, and the other has an external thread.

[0051] For example, combined Figure 3-5 As shown, the first end of the rear plug 22 has an external thread, and the corresponding part of the button 21 has an internal thread. The two are fixed by screwing together. The inner end of the button 21 has a cavity with an internal thread, which extends axially along the rear plug 22 and also along the direction of movement of the moving member 20. The first end of the rear plug 22 is cylindrical and extends axially, and its radial dimension matches the cavity. This threaded connection structure not only facilitates assembly, but also allows adjustment of the pre-compression of the elastic reset member 30 by adjusting the threaded connection length between the button 21 and the rear plug 22, thereby adjusting the pressing force to control the balance valve assembly to work in automatic or manual air intake mode. In addition, by adjusting the threaded connection length, the reserved space for the spring 31 can be changed, thereby accommodating springs 31 of different sizes.

[0052] When the pre-compression of the elastic reset member 30 is small, the pre-tightening force applied to the rear plug 22 is also small, and the balance valve assembly is in automatic air intake mode. In this mode, when the thrust generated by the pressure difference between the inside and outside of the housing 90 is sufficient to overcome the pre-tightening force, the gas outside the housing 90 will automatically push the button 21, thereby causing the rear plug 22 to move inward, opening the channel 11 and allowing external air to enter the housing 90 to achieve air pressure balance. After the air pressure difference decreases to below the threshold, the elastic reset member 30 drives the rear plug 22 to automatically reset.

[0053] When the pre-compression of the elastic reset member 30 is large, its pre-tightening force is also large. The air pressure difference inside and outside the housing 90 cannot overcome this pre-tightening force, and at this time the balance valve assembly is in manual air intake mode. In this mode, the user needs to manually press the button 21 to overcome the pre-tightening force of the spring 31 and drive the button 21 to move the rear plug 22 to achieve rapid air pressure balance.

[0054] The pressure applied by the button 21 and the rear plug 22 can be adjusted to adapt the balance valve assembly to refrigeration equipment products with different volumes and temperature ratings. For larger volumes or lower operating temperatures, such as large-capacity ultra-low temperature storage boxes, the pressure difference between the inside and outside of the box is large, requiring a larger pressure to open. In this case, the length of the threaded connection between the button 21 and the rear plug 22 can be shortened to increase the pre-compression of the elastic reset element 30, thereby increasing the pressure required to open and preventing accidental automatic opening due to pressure fluctuations that could affect the temperature stability inside the box. For smaller volumes or products with higher opening sensitivity requirements, such as small refrigerators, the length of the threaded connection can be lengthened to reduce the pre-compression and lower the pressure applied, making manual operation easier and improving the user experience.

[0055] The adjustment structure is simple and easy to implement. No parts need to be replaced. The pressure can be steplessly adjusted simply by rotating button 21. This effectively improves the versatility and applicability of the balance valve assembly and reduces the parts management and manufacturing costs of different models.

[0056] Optionally, combined Figure 2 , Figure 5 and Figure 6 As shown, the housing 90 includes a housing 91, and the balance valve assembly also includes a first embedded pipe 40. The first embedded pipe 40 passes through the housing 91, and the inner surface of the first embedded pipe 40 is provided with internal threads. The valve body 10 is provided with external threads, and at least a portion of the valve body 10 is disposed in the first embedded pipe 40 and is detachably connected to the first embedded pipe 40 by threaded engagement.

[0057] By pre-embedding the first embedded pipe 40 before foaming, the valve body 10 can be installed simply by screwing it in, without needing to drill additional holes or perform secondary positioning on the housing 91. Simultaneously, the threaded connection ensures reliable sealing and ease of disassembly between the valve body 10 and the first embedded pipe 40. As an independent component, the first embedded pipe 40 can be precisely positioned before foaming, and its internal threads will not deform due to foaming pressure after foaming, ensuring the accuracy and consistency of the valve body 10 installation.

[0058] The first embedded pipe 40 and the valve body 10 are connected by threads. The inner surface of the first embedded pipe 40 is provided with internal threads, and the outer circumference of the valve body 10 is provided with corresponding external threads. The valve body 10 is screwed into the first embedded pipe 40 through threaded engagement. This threaded connection method is reliable, self-locking, provides controllable sealing, and is convenient for disassembly and assembly. In addition, the thread parameters can be selected as needed. For example, fine threads can be used to obtain finer axial adjustment accuracy, or coarse threads can be used to improve assembly speed and tensile strength. The thread surface can also be treated with anti-corrosion coating to adapt to humid or corrosive environments.

[0059] It is understandable that a snap-fit ​​quick-release structure can also be used between the valve body 10 and the first pre-embedded pipe 40. For example, elastic claws can be provided on the outer periphery of the embedded part 12 of the valve body 10, and a groove can be provided on the inner wall of the first pre-embedded pipe 40. After the valve body 10 is pushed in, it will automatically lock, and it can be pulled out by pressing the release button 21, achieving quick disassembly and assembly. However, the threaded connection used in this embodiment is superior in terms of sealing performance, vibration resistance, ease of installation, and connection reliability.

[0060] Optionally, combined Figure 1 As shown, the front end of the valve body 10 protrudes from the first pre-embedded pipe 40 on the outer surface of the housing 90, forming an extension 13.

[0061] The extension 13 protrudes from the outer surface of the housing 90, making it easy for the operator to grip or use tools to tighten it. The extension 13 can be configured as a hexagonal prism. This allows the user to easily rotate the valve body 10 using a hexagonal wrench or socket wrench in conjunction with the extension 13 to complete installation, disassembly, or pressure adjustment operations. The hexagonal prism structure distributes force evenly, reduces slippage, and improves operational reliability and convenience.

[0062] It should be noted that the elastic reset component mentioned in the foregoing embodiments being located outside the housing does not mean that the elastic reset component must be completely exposed outside the housing without being enclosed by any component. Rather, it means that the channel section where the elastic reset component is located is located outside the outer surface of the housing, thus physically isolating it from the low-temperature environment inside the housing. Specifically, in this embodiment, the front end of the valve body protrudes from the outer surface of the housing, forming an extension outside the housing, and the elastic reset component is disposed within the cavity of this extension. Although the elastic reset component is still enclosed by the valve body, its cavity is completely isolated from the low-temperature air inside the housing through a sealing structure, and the wall of this cavity is in direct contact with the room-temperature air outside the housing, making the elastic reset component essentially in the room-temperature environment outside the housing. Therefore, "located outside the housing" should be understood as the working environment of the elastic reset component being outside the housing, rather than its geometric position being exposed outside the housing.

[0063] Optionally, combined Figure 3 and Figure 4 As shown, the rear plug 22 is provided with a conical surface 221, which gradually slopes outward along the direction from the outside of the housing 90 toward the inside, and is used to guide the incoming airflow to the side wall of the first pre-embedded pipe 40.

[0064] In cryogenic refrigeration equipment, frost easily condenses on the inner wall of the air inlet passage 11 of the balancing valve due to temperature differences. Long-term accumulation may block passage 11, causing the balancing valve to fail. The conical surface of the rear plug 22 enables air ventilation and defrosting.

[0065] The outside air temperature is relatively high and the humidity is low. When the outside air enters the housing 90 through the air hole 211 and the channel 11, the airflow is guided along the conical surface 221 of the rear plug 22 to the side wall of the first pre-embedded pipe 40, forming an airflow scouring effect. This effectively blows away the frost layer attached to the side wall of the first pre-embedded pipe 40, preventing frost accumulation and blockage of the channel 11. At the same time, the outside air can also defrost the valve body 10 and the moving parts 20.

[0066] For example, when the user presses the button 21 to open the channel 11, external air enters through the air hole 211, flows through the channel 11, the gap between the rear plug 22 and the valve body 10 in sequence, and is then guided through the conical part 221 to the side wall of the first pre-embedded pipe 40, and continues to flow into the housing 90 to defrost the other walls it flows through.

[0067] This passive defrosting method requires no additional energy, has a simple structure, and is inexpensive. It operates synchronously with the normal operation of the balancing valve, without increasing the user's operational burden. The tilt angle of the conical section 221 can be optimized according to the actual airflow velocity and frosting conditions, ensuring defrosting effectiveness without affecting the intake airflow.

[0068] Optionally, combined Figure 5As shown, the valve body 10 includes an embedded part 12 and an extended part 13. The embedded part 12 is embedded in the first pre-embedded pipe 40, and an external thread is provided on the embedded part 12. The extended part 13 is connected to the embedded part 12 and protrudes out of the first pre-embedded pipe 40. The outer diameter of the extended part 13 is larger than the inner diameter of the first pre-embedded pipe 40.

[0069] The valve body 10 is an integral hollow structure with an axially extending ventilation channel 11 connecting the interior and exterior of the housing 90. The valve body 10 includes an integrally connected insert 12 and an extended portion 13. The insert 12 has external threads on its outer periphery for engaging with the internal threads of the first embedded pipe 40, thus fixing and sealing the valve body 10 within the first embedded pipe 40. The outer diameter of the insert 12 matches the inner diameter of the first embedded pipe 40 to ensure the stability of the threaded fit. The extended portion 13 protrudes from the first embedded pipe 40, providing an area for manual rotation of the valve body 10, allowing for installation and disassembly without special tools. Simultaneously, the outer diameter of the extended portion 13 is larger than the inner diameter of the first embedded pipe 40, providing axial restraint and preventing excessive screwing of the valve body 10 that could damage the sealing structure or injure the housing 91.

[0070] The extension portion 13 and the embedded portion 12 are integrally formed, both being cylindrical. The radial dimension of the extension portion 13 is larger than the radial dimension of the embedded portion 12, resulting in a stepped shape for the valve body 10 along the axial direction. Figure 5 and Figure 9 As shown, the connection between the extension portion 13 and the embedded portion 12 forms a support surface 14, which serves as an abutment surface on the valve body 10 and abuts against one end of the elastic reset member 30. The other end of the elastic reset member 30 abuts against the moving member 20 and can abut against the abutment surface provided on the inner circumferential surface of the button 21. When the moving member 20 moves toward the inside of the housing 90 to the open position, the moving member 20 compresses the elastic reset member 30, so that the elastic reset member 30 is stably restricted between the support surface 14 and the moving member 20; when the external force on the moving member 20 is removed and the internal and external air pressure is balanced, the elastic reset member 30 extends, and provides a reaction force through the support surface, pushing the moving member 20 to reset. Thus, the elastic reset member 30 is entirely located in the normal temperature region outside the housing 90, avoiding the risk of low-temperature freezing failure.

[0071] Optionally, combined Figure 9 As shown, the outer periphery of the extension 13 is set as a polygonal prism structure.

[0072] For example, the outer periphery of the extension portion 13 can be configured as a hexagonal prism structure, and the extension portion 13 is hollow, that is, the extension portion 13 is configured as a hexagonal cylindrical structure. This facilitates the application of torque for tightening using tools such as wrenches, or by directly holding and tightening it by hand.

[0073] Optionally, combined Figure 9As shown, an anti-slip structure 132 is provided on the outer peripheral surface of the extension portion 13.

[0074] The anti-slip structure 132 increases the friction between the fingers or tools and the extension 13, allowing the user to manually turn the valve body 10 without special tools. Exemplarily, the anti-slip structure 132 can be knurled, such as a grid knurling or straight knurling. The anti-slip structure 132 can also be axially extending strip-shaped grooves, with multiple strip-shaped grooves spaced circumferentially along the extension 13 to form an anti-slip texture. Multiple strip-shaped grooves can be evenly arranged circumferentially along the extension 13 to provide a uniform anti-slip effect, avoiding slippage or operational inconvenience due to localized force.

[0075] When the extension 13 is configured as a polygonal prism structure, adjacent facets are connected by rounded corners, and each facet can be equipped with an anti-slip structure 132. In this way, the convenience of using the polygonal structure with the tool is maintained, while the anti-slip structure 132 increases the friction during manual operation. The two functions complement each other, further improving the flexibility and reliability of operation.

[0076] Optionally, combined Figure 3 and Figure 9 As shown, the embedded part 12 has an inner cavity 121, and a positioning part 122 is protruding on the wall of the inner cavity 121. The positioning part 122 cooperates with the outer peripheral surface of the moving part 20 to restrict the moving part 20 from moving radially.

[0077] By protruding a positioning part 122 on the wall of the inner cavity 121 of the embedded part 12 and having the positioning part 122 cooperate with the outer peripheral surface of the moving part 20, the radial movement of the moving part 20 in the channel 11 can be effectively restricted, thereby ensuring the centering of the moving part 20 during reciprocating motion. The channel 11 of the valve body 10 needs to accommodate the moving part 20 and allow it to move axially. A protruding positioning part 122 is provided on the wall of the inner cavity 121 of the embedded part 12. The positioning part 122 forms a small clearance fit or sliding fit with the outer peripheral surface of the moving part 20, so that the moving part 20 can only move axially, and the radial displacement is restricted to a very small range. This ensures that the moving part 20 is accurately aligned with the inner end face of the valve body 10 when in the closed position, avoiding poor sealing caused by eccentricity; when in the open position, the moving part 20 can slide smoothly without abnormal friction with the inner wall of the channel 11 due to radial wobbling. Meanwhile, since the inner cavity 121 forms part of the channel 11, the positioning part 122 directly acts on the mating section between the moving part 20 and the channel 11, eliminating the need for additional guide parts, thus simplifying the structure and reducing manufacturing costs.

[0078] Optionally, combined Figure 9As shown, the positioning part 122 includes a plurality of ribs 123 arranged circumferentially along the inner cavity 121, and the plurality of ribs 123 together enclose a guide space 124 through which the moving member 20 passes.

[0079] Multiple ribs 123 are spaced apart circumferentially and evenly distributed. The inner surface of the ribs 123 forms a small clearance fit with the outer peripheral surface of the moving part 20, thereby providing uniform radial constraint and effectively improving the stability of the moving part 20 in axial reciprocating motion. The rib structure 123 is integrally formed with the embedded part 12, requiring no additional processing or assembly. In addition, when applied to low-temperature environments, the intermittent contact of the ribs 123 reduces the heat conduction area, which is beneficial for the transfer of low temperature within the isolation box to the area where the elastic reset part 30 is located, further protecting the elastic reset part 30 from the effects of low temperature.

[0080] Optionally, combined Figure 5 and Figure 10 As shown, the end face of the extension portion 13 facing the housing 91 is provided with a first groove 131, which extends circumferentially along the extension portion 13; the balance valve assembly also includes a first sealing gasket 70, which is embedded in the first groove 131 and is used to abut against the first pre-embedded pipe 40 or the housing 91 to achieve a seal.

[0081] A first groove 131 extending circumferentially is provided on the side of the outer extension 13 near the first pre-embedded pipe 40. The first groove 131 is closed axially, and the first sealing gasket 70 is embedded in the first groove 131. When the valve body 10 is fully screwed into the first pre-embedded pipe 40, the first sealing gasket 70 is pressed between the end face of the first pre-embedded pipe 40 and the outer extension 13 of the valve body 10, or is pressed between the outer surface of the housing 91 and the outer extension 13, thereby achieving a seal on the housing 91 side and preventing external moisture or dust from entering the interior of the first pre-embedded pipe 40 along the threaded fit gap.

[0082] A portion of the first sealing gasket 70 is embedded in the first groove 131, while another portion protrudes from the end face of the extension 13 to abut against the mating surface (i.e., the end face of the first embedded pipe 40 or the outer surface of the housing 91). The depth of the first groove 131 is slightly less than the thickness of the first sealing gasket 70, allowing the first sealing gasket 70 to protrude from the first groove 131, ensuring sufficient elastic pressure even after compression. The portion of the first sealing gasket 70 protruding from the first groove 131 forms an elastic compression with the mating surface, achieving a tight fit through the elastic deformation of the first sealing gasket 70 regardless of minor unevenness on the mating surface. Furthermore, this groove installation method facilitates the replacement and maintenance of the first sealing gasket 70 and effectively prevents it from falling off during use.

[0083] The first groove 131 extends circumferentially along the outer extension 13, forming a closed annulus, for accommodating the first sealing gasket 70. This annular structure can form a uniform circumferential constraint on the first sealing gasket 70, providing continuous sealing in the circumferential direction.

[0084] Optionally, the first sealing gasket 70 is a silicone sealing gasket.

[0085] Silicone material possesses excellent low-temperature resistance, maintaining elasticity at low temperatures. It also exhibits good compression set and anti-aging properties, making it suitable for the low-temperature environments of refrigeration equipment. The first sealing gasket 70 can have an adhesive backing. The adhesive-backed first sealing gasket 70 is adhered to the first groove 131, and after installation, it is pressed against the first embedded tube 40 to achieve a seal. The adhesive backing prevents the sealing gasket from falling off due to gravity or vibration during assembly, improving assembly convenience. Simultaneously, the adhesive backing fills the tiny gap between the first sealing gasket 70 and the bottom surface of the first groove 131, forming an auxiliary sealing layer and further enhancing the overall sealing effect. It is understood that the first sealing gasket 70 can also be directly embedded into the first groove 131 without an adhesive backing; both methods achieve reliable sealing.

[0086] By controlling the torque at which the valve body 10 is screwed into the first embedded tube 40, the compression of the first sealing gasket 70 can be precisely adjusted to ensure a sealing effect. To prevent the first sealing gasket 70 from being damaged due to over-compression, an axial limiting structure can be provided to limit the maximum compression. For example, by limiting the gap between the extension portion 13 and the end face of the first embedded tube 40, the first sealing gasket 70 reaches its maximum designed compression when the valve body 10 is screwed in until the extension portion 13 contacts the end face of the first embedded tube 40. Alternatively, a limiting structure can be provided on the valve body 10, such as a boss on the extension portion 13. When the valve body 10 is screwed in until the boss abuts against the outer surface of the housing 91, the compression of the first sealing gasket 70 is limited to a preset range. In this way, the compression required for sealing can be guaranteed, while avoiding permanent deformation or damage to the first sealing gasket 70 due to over-compression.

[0087] Optionally, combined Figure 5 and Figure 10 As shown, the rear plug 22 is provided with a second groove 224, which extends circumferentially along the rear plug 22. The balance valve assembly also includes a second sealing gasket 80, which is embedded in the second groove 224 and is used to abut against the valve body 10 to achieve a seal.

[0088] A second groove 224 extending circumferentially is provided in the rear plug 22, and a second sealing gasket 80 is embedded in the second groove 224 to abut against the valve body 10 to achieve a seal, thus realizing a dynamic seal between the moving part 20 and the valve body 10. When the rear plug 22 reciprocates under the action of the button 21, the second sealing gasket 80 embedded in the second groove 224 always maintains elastic contact with the inner end face of the valve body 10, allowing relative sliding while preventing low-temperature air in the chamber from leaking out to the button 21 side through the gap between the rear plug 22 and the valve body 10. The second groove 224 also serves to fix the second sealing gasket 80 and prevent it from falling off.

[0089] The Shore hardness of the second sealing gasket 80 can be selected as needed. For example, a silicone sealing gasket with a Shore hardness of 30±5 can be used to reduce sliding resistance while ensuring sealing performance, making the pressing operation easy and smooth. The second sealing gasket 80 is embedded in the second groove 224 and also protrudes from the second groove 224 by a certain height to ensure reliable elastic compression with the end face of the valve body 10. The rear plug 22 and the valve body 10 have two planar contacts, and the second groove 224 can be fitted with an annular sealing gasket or an O-ring sealing gasket.

[0090] The radial dimension of the second sealing gasket 80 is larger than the maximum radial dimension of the conical section 221, so that the second sealing gasket 80 protrudes radially from the conical section 221, and the outer periphery of the second sealing gasket 80 can directly abut against the end face of the valve body 10. When the moving part 20 is in the closed position, the second sealing gasket 80 is pressed between the mounting part 223 of the rear plug 22 and the valve body 10.

[0091] Optionally, combined Figure 5 and Figure 10 As shown, the rear plug 22 includes a connecting part 222, a conical part 221, and a mounting part 223. The connecting part 222, the conical part 221, and the mounting part 223 are connected sequentially along the axial direction and are integrally formed.

[0092] The connecting part 222 is located at the first end of the rear plug 22, that is, the end near the outside of the housing 90. The connecting part 222 is provided with external threads, which can be detachably screwed into and fixed with the internal threads of the button 21. The conical part 221 is located between the connecting part 222 and the mounting part 223. The conical part 221 gradually slopes outward radially from the outside of the housing 90 toward the inside of the housing 90, and is used to guide the external airflow entering the channel 11 to the side wall of the first pre-embedded pipe 40 to achieve ventilation and defrosting. The mounting part 223 is located at the second end of the rear plug 22, that is, the end near the inside of the housing 90. The radial dimension of the mounting part 223 is larger than the maximum radial dimension of the conical part 221, and also larger than the radial dimension of the inner cavity 121 of the embedded part 12. The second groove 224 is provided between the mounting part 223 and the conical part 221, that is, the end face of the mounting part 223 facing the conical part 221. The second sealing gasket 80 is embedded in the second groove 224.

[0093] The outer diameter of the button matches the inner diameter of the extension portion, allowing the button to slide smoothly axially within the extension portion. Simultaneously, the outer diameter of the button is larger than the inner diameter of the insert portion, meaning the outer diameter of the button is larger than the radial dimension of the insert portion's inner cavity. A support surface is formed between the extension portion and the insert portion. A portion of the button's axial projection overlaps with the support surface; for example, the axial projection of the button's outer radial edge overlaps with the support surface. The button's axial direction is consistent with the movement direction of the moving component. A resilient reset component abuts against the corresponding end face of the button and the support surface. The support surface acts as an axial limiter, preventing the button from excessively moving the resilient reset component into the housing, thus preventing damage to related components due to excessive pressing stroke.

[0094] The button includes a pressing part and a connecting mating part integrally connected along the axial direction. The radial dimension of the connecting mating part is smaller than that of the pressing part. The connecting mating part mates with the connecting part of the rear plug to form a connecting mating section. Through this connecting mating section, the button and the rear plug are detachably fixedly connected, enabling synchronous movement of both. The connecting mating part includes a cylindrical structure with internal threads, and the connecting part includes a cylindrical structure with external threads; the two are detachably connected through threaded engagement.

[0095] When the movable part 20 is in the closed position, the connecting section is located in the inner cavity of the embedded part, that is, the connecting section between the button and the rear plug is completely accommodated within the space defined by the embedded part. At this time, the conical part of the rear plug is also located in the inner cavity of the embedded part. At the same time, the end face of the mounting part 223 abuts against the end face of the embedded part 12 through the second sealing gasket 80. The second sealing gasket 80 is compressed between the mounting part 223 and the embedded part 12, thereby achieving a seal between the rear plug 22 and the valve body 10, preventing the low-temperature air inside the housing 90 from flowing outward along the gap between the rear plug 22 and the valve body 10. The radial dimension of the mounting part 223 is relatively large, which can provide sufficient sealing area and form a reliable planar contact with the end face of the embedded part 12. The radial dimension of the mounting part 223 is larger than the radial dimension of the inner cavity 121 of the embedded part 12, thereby forming a limiting structure in the axial direction, which can prevent the movable part 20 from being dislodged from the valve body 10 in a direction away from the housing 90. All parts are integrally molded, ensuring structural strength and coaxiality.

[0096] Optionally, combined Figure 4 and Figure 10 As shown, the end face of the second end of the rear plug 22 is provided with a tool mating hole 225, which is used to mate with a tool to fix the rear plug 22 in place.

[0097] For example, the tool mating hole 225 is a hexagonal hole that can mate with an internal hex wrench, allowing the operator to easily rotate the rear plug 22 to adjust the threaded connection length between the button 21 and the rear plug 22, or to remove the rear plug 22 to replace the second sealing gasket 80, thereby improving the convenience of assembly and maintenance. The tool mating hole 225 can be provided only in the mounting part 223, or it can be provided simultaneously in the mounting part 223 and the tapered part 221 to increase the hole depth and provide more stable torque transmission.

[0098] Optionally, combined Figure 1 and Figure 2 As shown, the box body 90 also includes an inner liner 92, and a foaming space 93 is provided between the box shell 91 and the inner liner 92. The balance valve assembly also includes a second pre-embedded pipe 50 and a connecting pipe 60. The second pre-embedded pipe 50 is used to pass through the inner liner 92. One end of the connecting pipe 60 is connected to the first pre-embedded pipe 40, and the other end is connected to the second pre-embedded pipe 50. The first pre-embedded pipe 40 is provided with a first limiting part 41, and the second pre-embedded pipe 50 is provided with a second limiting part 51. The first limiting part 41 and the second limiting part 51 respectively limit and cooperate with the two ends of the connecting pipe 60 to fix the connecting pipe 60 between the first pre-embedded pipe 40 and the second pre-embedded pipe 50. The length of the connecting pipe 60 is configured to be selectable according to the thickness of the foam layer of the box body 90.

[0099] The embedded pipe fitting includes a first embedded pipe 40, a connecting pipe 60, and a second embedded pipe 50. The first embedded pipe 40 is embedded in the foam layer on the side of the shell 91 and passes through the opening in the shell 91; the second embedded pipe 50 is embedded in the foam layer on the side of the inner liner 92 and passes through the opening in the inner liner 92; the connecting pipe 60 connects the first embedded pipe 40 and the second embedded pipe 50 and is used to adjust the length of the entire embedded pipe fitting. The first embedded pipe 40, the second embedded pipe 50, and the connecting pipe 60 are all embedded in the shell 90 before foaming.

[0100] To accommodate different foam layer thicknesses, this can be achieved by replacing the connecting pipe 60 with different lengths, or by using a telescopic sleeve to adapt to different thicknesses, eliminating the need for cutting and effectively simplifying installation. For example, if the foam layer thickness is between 50mm and 150mm, the length of the connecting pipe 60 should be selected accordingly. The adjustable length design of the connecting pipe 60 allows the same set of pre-embedded pipe fittings to adapt to box 90s with different foam layer thicknesses, effectively improving the versatility of parts and reducing costs.

[0101] The combination of the first embedded pipe 40, the connecting pipe 60, and the second embedded pipe 50 forms a complete mounting hole 100 that runs through the entire foam layer. This mounting hole 100 can accommodate the valve body 10, the moving part 20, and the elastic reset part 30, with the moving part 20 and the elastic reset part 30 housed within the valve body 10. The valve body 10, the moving part 20, and the elastic reset part 30 can be installed and removed synchronously as a whole simply by twisting the valve body 10 and utilizing the threaded connection.

[0102] Meanwhile, the limiting cooperation between the first limiting part 41, the second limiting part 51, and the connecting pipe 60 ensures that the connecting pipe 60 will not shift or come out due to the flow of foaming material during the foaming process, thus guaranteeing the coaxiality and sealing of the mounting hole 100. Furthermore, the pre-embedded method allows the openings of the shell 91 and the inner liner 92 to be precisely positioned before foaming, eliminating the need for secondary drilling or enlarging after foaming and avoiding foaming material leakage and burr problems at the openings.

[0103] The two ends of the connecting pipe 60 are respectively fitted onto the outer periphery of the first embedded pipe 40 and the second embedded pipe 50. To ensure the sealing of the connection and prevent the foaming material from seeping into the pipe during the foaming process, a sealing fit is formed between the two ends of the connecting pipe 60 and the outer peripheral surfaces of the first embedded pipe 40 and the second embedded pipe 50. For example, an interference fit can be used between the connecting pipe 60 and the first embedded pipe 40 and the second embedded pipe 50, that is, the inner diameter of the connecting pipe 60 is slightly smaller than the outer diameter of the first embedded pipe 40 and the second embedded pipe 50, and radial sealing is achieved through elastic deformation or compression assembly. In addition, a sealing ring or sealant can be added at the connection to further improve the sealing reliability. The interference fit can effectively prevent the foaming material from flowing into the pipe along the connection gap, ensuring the unobstructed flow of the mounting hole 100. At the same time, the interference fit can also provide a certain axial frictional resistance, helping the connecting pipe 60 to maintain a stable position during the foaming process and preventing displacement due to the flow of foaming material.

[0104] The first limiting part 41 and the second limiting part 51 can be configured as an annular boss extending in the circumferential direction, or as a plurality of bosses discretely distributed in the circumferential direction. The two ends of the connecting pipe 60 respectively abut against the first limiting part 41 and the second limiting part 51, thereby being fixed between the first embedded pipe 40 and the second embedded pipe 50.

[0105] After the conical part 221 of the back plug 22 guides the airflow toward the side wall of the first pre-embedded pipe 40, the airflow can continue to flow along the side wall of the first pre-embedded pipe 40 to the side wall of the connecting pipe 60 and the side wall of the second pre-embedded pipe 50, thereby defrosting the inner wall of the entire pre-embedded pipe fitting and preventing frost from accumulating and blocking at any position inside the pre-embedded pipe fitting.

[0106] Optionally, combined Figure 2 As shown, the first limiting part 41 includes a first chamfer 411, which protrudes from the outer surface of the first pre-embedded pipe 40; the second limiting part 51 includes a second chamfer 511, which protrudes from the outer surface of the second pre-embedded pipe 50; the two ends of the connecting pipe 60 along the axial direction abut against the first chamfer 411 and the second chamfer 511 respectively.

[0107] The end faces of the first chamfer 411 and the second chamfer 511 serve as limiting surfaces, respectively abutting against the ends of the connecting pipe 60 to restrict the axial movement of the connecting pipe 60 and prevent displacement or leakage of the connecting pipe 60 due to the flow of foaming material during the foaming process. Simultaneously, the first chamfer 411 and the second chamfer 511 also have a guiding function, guiding the first embedded pipe 40 and the second embedded pipe 50 to smoothly insert into the openings of the shell 91 and the inner liner 92, respectively, avoiding jamming or scratching during installation.

[0108] It is understandable that the first and second limiting parts can also adopt other limiting structures that can form axial abutment or snap-fit ​​on the end of the connecting pipe, such as annular ribs, radial pins, constriction structures or snap rings, to achieve axial positioning of the connecting pipe.

[0109] Optionally, combined Figure 2 and Figure 8 As shown, multiple first chamfers 411 are evenly arranged along the circumference of the first pre-embedded pipe 40; multiple second chamfers 511 are evenly arranged along the circumference of the second pre-embedded pipe 50.

[0110] This circumferentially distributed structure can provide uniform restraint and guidance.

[0111] Optionally, combined Figure 2 As shown, the first embedded pipe 40 and the second embedded pipe 50 have the same structure and can be used interchangeably.

[0112] This can improve the versatility of parts, reduce mold costs, and reduce error-proofing requirements during assembly.

[0113] For ease of description, the first embedded pipe 40 and the second embedded pipe 50, which have the same structure, can be collectively referred to as embedded pipes. Figure 8 As shown, the first and second embedded pipes adopt the same structure, that is... Figure 8 The embedded pipe structure shown can represent both the first and second embedded pipes. Figure 8 The first pre-embedded pipe is used as an example for marking.

[0114] Optionally, combined Figure 2 and Figure 5 As shown, the first embedded pipe 40 includes a first embedded part 43 and a first extension part 44. The first embedded part 43 is provided with a first through hole 431 extending along the axial direction. The first embedded part is used to pass through the opening of the housing 91 and is embedded in the foaming space 93. The valve body 10 is embedded in the first through hole 431. The first extension part 44 is formed by the first embedded part 43 extending radially outward toward the circumferential edge of the housing 91, and is used to cover the opening of the housing 91.

[0115] The first embedded tube 40 is cylindrical in shape, with an axially extending through hole inside. The inner surface of the first through hole has an internal thread for engagement with the external thread of the valve body 10. The wall thickness of the first embedded part is set to 1.2 mm. This wall thickness ensures sufficient strength while avoiding interference with the normal operation of the expansion and contraction mold core in the foaming mold. The expansion and contraction mold core expands from the inside of the first embedded part for limiting its position. The first extension 44 is formed by radially extending outward from the circumferential edge of the first embedded part towards the outer side of the housing 91. The outer surface of the first extension is a smooth surface, used to cover the opening edge of the housing 91, preventing foam material overflow and serving a decorative purpose.

[0116] After foaming, the first embedded pipe 40 can completely cover the edge of the opening on the shell 91, forming a clean appearance without the need for an additional decorative cover. Simultaneously, the first extension fits snugly against the outer surface of the shell 91, preventing foam material from overflowing from the opening and preventing external moisture from seeping into the foam layer along the opening edge. Furthermore, the first extension increases the contact area between the first embedded pipe 40 and the shell 91, better resisting foaming pressure during the foaming process and preventing the embedded pipe from being pushed or displaced.

[0117] The outer diameter of the aforementioned valve body's extension 13 is larger than the inner diameter of the first embedded tube 40, specifically meaning that the outer diameter of the extension 13 is larger than the inner diameter of the first embedded part 43. Simultaneously, the outer diameter of the extension 13 can be smaller than the radial dimension of the first extension 44. Thus, when the valve body is screwed into the first embedded tube, the first extension forms a stop against the valve body's extension, and the first sealing gasket is pressed between the end face of the extension and the outer surface of the first extension, thereby achieving a reliable seal.

[0118] Optionally, combined Figure 2 and Figure 5 As shown, the second embedded pipe 50 includes a second embedded part 53 and a second extension part 54. The second embedded part 53 is provided with a second through hole 531 extending along the axial direction. The second embedded part 53 is used to pass through the opening of the inner liner 92 and is embedded in the foaming space 93. The second extension part 54 is formed by the second embedded part 53 extending radially outward toward the circumferential edge of the outer side of the inner liner 92, and is used to cover and shield the opening of the inner liner 92.

[0119] The structure of the second embedded pipe 50 is basically the same as that of the first embedded pipe 40. The second extension fits snugly against the outer surface of the inner liner 92, preventing the foaming material from overflowing from the openings in the inner liner 92 during the foaming process and preventing external moisture from seeping into the foam layer along the edges of the openings. This also creates a clean appearance for the inner liner 92, eliminating the need for an additional decorative cover. Furthermore, the second extension increases the contact area between the second embedded pipe 50 and the inner liner 92, better resisting foaming pressure during the foaming process and preventing the embedded pipe from being pushed or displaced. Other technical effects can be referred to the description of the first embedded pipe 40 above, and will not be repeated here.

[0120] For example, before foaming, the first embedded tube 40 is inserted into the opening of the shell 91, and the second embedded tube 50 is inserted into the opening of the inner liner 92. Then, a connecting tube 60 of appropriate length is cut according to the actual thickness of the foaming space 93, and the first embedded tube 40 and the second embedded tube 50 are inserted into the two ends of the connecting tube 60 respectively until they abut against the first limiting part 41 and the second limiting part 51. After that, the shell 91 and the inner liner 92 are closed, and foaming material is injected. During the foaming process, the expansion and contraction mold core expands and limits from the inside of the first embedded tube 40 and the second embedded tube 50, and the clamp clamps the first extension and the second extension from the outside, thereby ensuring the accurate positioning of the embedded tubes. After foaming is completed, the first embedded tube 40, the connecting tube 60 and the second embedded tube 50 are firmly embedded in the foam layer, forming an integrated mounting hole 100.

[0121] Optionally, combined Figure 2-4 As shown, the first embedded pipe 40 is provided with a first snap-fit ​​part 42, and the housing 91 is provided with a first snap-fit ​​mating part 911. The first snap-fit ​​part 42 and the first snap-fit ​​mating part 911 snap-fit ​​and engage to restrict the first embedded pipe 40 from moving away from the foaming space 93 along the axial direction, and to restrict the first embedded pipe 40 from rotating in the circumferential direction.

[0122] The housing 91 is provided with a first opening corresponding to the first embedded part and a first snap-fit ​​part 911 corresponding to the first snap-fit ​​part 42. When the first embedded part is inserted into the first opening, the first snap-fit ​​part 42 engages with the first snap-fit ​​part 911. The axial limiting function of the first snap-fit ​​part 42 can prevent the first embedded tube 40 from being pushed outward due to the expansion of the foaming material during the foaming process, and can also prevent the first embedded tube 40 from being pushed out when the connecting tube 60 is inserted, so that the end face of the first embedded tube 40 remains flush with the outer surface of the housing 91. The circumferential limiting function of the first snap-fit ​​part 42 ensures that the first embedded tube 40 will not rotate when the valve body 10 is screwed in by the thread, so that the valve body 10 can be tightened smoothly.

[0123] Optionally, combined Figure 6 and Figure 7 As shown, the first snap-fit ​​part 911 includes a first snap-fit ​​opening 912; the first snap-fit ​​part 42 includes a first inverted snap-fit ​​structure 421, the first inverted snap-fit ​​structure 421 includes a plurality of first snap-fit ​​surfaces 422 arranged in a stepped manner along the direction of the housing 91 toward the foaming space 93; when the first inverted snap-fit ​​structure 421 is inserted into the first snap-fit ​​opening 912, according to the thickness of the housing 91, one of the plurality of first snap-fit ​​surfaces 422 snaps into the first snap-fit ​​opening 912 accordingly.

[0124] In this embodiment, the description of one of the multiple first snap-fit ​​surfaces engaging with the corresponding first snap-fit ​​opening based on the shell thickness means that the multiple first snap-fit ​​surfaces correspond to different shell thicknesses and are used to engage with the edge of the first snap-fit ​​opening of the shell of the corresponding thickness. In other words, the multiple first snap-fit ​​surfaces are used to engage with the edges of the first snap-fit ​​opening of shells of different thicknesses. The multiple stepped first snap-fit ​​surfaces arranged on the first inverted snap-fit ​​structure can automatically adapt to shells of different thicknesses. When the first inverted snap-fit ​​structure is inserted into the first snap-fit ​​opening, the edge of the first snap-fit ​​opening of the shell will stop at the step position corresponding to its thickness and form a snap-fit ​​with the first snap-fit ​​surface corresponding to that step position. This process does not require manual selection or adjustment; it is automatically determined by the geometric relationship between the shell thickness and the step size of the inverted snap-fit ​​structure.

[0125] Multiple first snap-fit ​​surfaces 422 are used to engage with the edges of first snap-fit ​​openings 912 of housing shells 91 of different thicknesses. When the first inverted snap-fit ​​structure 421 is inserted into the first snap-fit ​​opening 912, the first snap-fit ​​surfaces 422 engage with the edges of the first snap-fit ​​opening 912, thereby restricting the movement of the first embedded tube 40 away from the foaming space 93 in the axial direction; at the same time, the first snap-fit ​​opening 912 and the first inverted snap-fit ​​structure 421 form a circumferential limit to prevent the first embedded tube 40 from rotating circumferentially. The multiple first snap-fit ​​surfaces 422 arranged in a stepped manner can automatically compensate for the manufacturing tolerance of the thickness of the housing shell 91. Housing shells 91 of different thicknesses cause the edges of the first snap-fit ​​openings 912 to stop at different stepped positions, thereby forming a precise snap-fit ​​with the corresponding first snap-fit ​​surfaces 422. The same first embedded tube 40 can be adapted to housing shells 91 of various thicknesses, eliminating the need for separate molds for each thickness, improving the versatility of parts, and reducing mold costs and inventory management difficulties.

[0126] Optionally, combined Figure 7 As shown, the first inverted snap-fit ​​structure 421 is disposed on the first extension 44 and extends from the first extension toward the foaming space 93, and a plurality of first snap-fit ​​surfaces 422 are disposed on the side of the first inverted snap-fit ​​structure 421.

[0127] The first inverted clamping structure 421 is directly set on the first extension. The first inverted clamping structure 421 can be integrally connected with the first extension. The structural strength of the first extension itself is used to transfer the clamping force, avoiding deformation or breakage due to excessive cantilever length, and improving the stability of long-term use.

[0128] Optionally, combined Figure 3 As shown, there are multiple first snap-fit ​​portions 42, and the multiple first snap-fit ​​portions 42 are symmetrically arranged circumferentially along the first extension.

[0129] For example, there are two first snap-fit ​​portions 42, symmetrically arranged on opposite sides of the first extension. The symmetrical arrangement of multiple first snap-fit ​​portions 42 ensures that the snap-fit ​​force is evenly distributed in the circumferential direction, preventing the first embedded pipe 40 from tilting or becoming eccentric due to unilateral force, and ensuring that its axis coincides with the axis of the first opening, which is beneficial to the coaxiality when the valve body 10 is screwed in. At the same time, the symmetrical structure also improves the stability and vibration resistance of the snap-fit.

[0130] Optionally, a plurality of first snap-fit ​​portions 42 are spaced apart and evenly arranged along the circumferential direction of the first extension portion 44.

[0131] For example, when there are three first snap-fit ​​parts 42, they can be arranged at 120° intervals along the circumference to form a uniform distribution. This uniform circumferential spacing ensures that each first snap-fit ​​part 42 is distributed at equal angles along the circumference, resulting in a balanced distribution of snap-fit ​​force and preventing stress concentration. Simultaneously, it helps the first embedded pipe 40 maintain axial alignment during the foaming process, improving the coaxiality and stability of the subsequent threaded assembly of the valve body 10.

[0132] Optionally, combined Figure 7 As shown, the insertion end of the first inverted clamping structure 421 is provided with a first guide slope 423.

[0133] The first guide slope 423 plays a guiding role when inserting the first bayonet 912, which can effectively reduce installation resistance and prevent the edges of the first snap-fit ​​structure 421 or the first bayonet 912 from being scratched or deformed due to hard contact, thereby improving assembly efficiency and yield.

[0134] Optionally, combined Figure 1-3 As shown, the second embedded pipe 50 is provided with a second snap-fit ​​part 52, and the inner liner 92 is provided with a second snap-fit ​​mating part 921. The second snap-fit ​​part 52 and the second snap-fit ​​mating part 921 are snap-fit ​​mating to restrict the movement of the second embedded pipe 50 away from the foaming space 93 along the axial direction and to restrict the rotation of the second embedded pipe 50 along the circumferential direction.

[0135] The engagement between the second snap-fit ​​part 52 and the second bayonet 922 achieves axial limiting, preventing the second pre-embedded tube 50 from being pushed out when the connecting tube 60 is inserted or during the foaming process. At the same time, it can also achieve circumferential limiting, preventing the pre-embedded tube from rotating when the valve body 10 is screwed in, ensuring the stability of the assembly process and the reliability of the seal.

[0136] The structure of the second snap-fit ​​part 52 of the second pre-embedded pipe 50 is basically the same as that of the first snap-fit ​​part 42 of the first pre-embedded pipe 40, and their technical effects are also largely the same.

[0137] Optionally, combined Figure 2 , Figure 3 and Figure 6As shown, the second snap-fit ​​part 921 includes a second snap-fit ​​opening 922; the second snap-fit ​​part 52 includes a second inverted snap-fit ​​structure 521, the second inverted snap-fit ​​structure 521 includes a plurality of second snap-fit ​​surfaces 523 arranged in a stepped manner along the direction of the inner liner 92 toward the foaming space 93; when the second inverted snap-fit ​​structure 521 is inserted into the second snap-fit ​​opening 922, according to the thickness of the inner liner 92, one of the plurality of second snap-fit ​​surfaces 523 snaps into the second snap-fit ​​opening 922 accordingly.

[0138] Optionally, combined Figure 6 As shown, the second snap-fit ​​structure 521 is provided on the second extension 54 and extends from the second extension toward the foaming space 93, and a plurality of second snap-fit ​​surfaces 523 are provided on the side of the second snap-fit ​​structure 521.

[0139] By using multiple second snap-fit ​​surfaces 523 arranged in a stepped manner, it can automatically adapt to inner liner 92 of different thicknesses, compensate for the manufacturing tolerances of inner liner 92, and make the same second pre-embedded tube 50 usable for various inner liner 92 thicknesses, thereby improving the versatility of parts and reducing mold costs.

[0140] Optionally, combined Figure 3 As shown, there are multiple second snap-fit ​​portions 52, and the multiple second snap-fit ​​portions 52 are symmetrically arranged circumferentially along the second extension.

[0141] Optionally, a plurality of second snap-fit ​​portions 52 are spaced apart and evenly arranged along the circumferential direction of the second extension.

[0142] Multiple second snap-fit ​​parts 52 are arranged symmetrically or evenly along the circumference of the second extension, so that the snap-fit ​​force is evenly distributed in the circumference, avoiding the second pre-embedded pipe 50 from becoming eccentric due to unilateral force, ensuring that its axis coincides with the axis of the opening of the inner liner 92, thereby ensuring coaxial connection with the connecting pipe 60.

[0143] Optionally, combined Figure 6 As shown, the insertion end of the second inverted clamping structure 521 is provided with a second guide slope 522.

[0144] The second guide slope 522 provided at the insertion end of the second inverted locking structure 521 plays a guiding role when the second bayonet 922 is inserted, which can effectively reduce the installation resistance and prevent the edges of the second inverted locking structure 521 or the second bayonet 922 from being scratched or deformed due to hard contact.

[0145] Optionally, combined Figure 3 As shown, the first embedded pipe 40, the connecting pipe 60 and the second embedded pipe 50 form a through mounting hole 100. After the valve body 10, the moving part 20 and the elastic reset part 30 are removed from the first embedded pipe 40, the mounting hole 100 is used for the test cable to pass through, so as to be used as a test hole 101.

[0146] The mounting hole 100 of the balance valve assembly is interchangeable with the test hole 101. Rotating the valve body 10 clockwise allows it to be inserted into the first pre-embedded tube 40, while rotating it counterclockwise allows it to be disassembled. After the valve body 10, moving part 20, and elastic reset part 30 are removed from the first pre-embedded tube 40, the mounting hole 100 allows the test cable to pass through, thus serving as the test hole 101. After testing, screwing the valve body 10, moving part 20, and elastic reset part 30 back into the first pre-embedded tube 40 restores the balance valve function. This functional reuse reduces the number of openings on the housing 90, lowering the risk of cold leakage and foam material leakage. It also simplifies the structure of the housing 90, reduces manufacturing costs, and improves operational flexibility.

[0147] This disclosure provides a refrigeration device, including a housing 90 and a balance valve assembly for refrigeration device as described in any of the above-disclosed embodiments. The housing 90 has an opening that connects the interior of the housing 90 with the exterior of the housing 90; the balance valve assembly is disposed in the opening.

[0148] The refrigeration equipment described in this disclosure includes, but is not limited to, medical cryogenic storage boxes, ultra-low temperature freezers, or household freezers. Exemplarily, the first embedded pipe 40, connecting pipe 60, and second embedded pipe 50 of the balance valve assembly are disposed in the opening, forming an installation hole 100, which can also serve as a test hole 101. The valve body 10 is detachably installed in the first embedded pipe 40 via threads. The movable member 20 is movably disposed within the channel 11 of the valve body 10, and the elastic reset member 30 is disposed between the movable member 20 and the valve body 10 and located outside the housing 90.

[0149] The refrigeration equipment provided in this disclosure includes the balance valve assembly for refrigeration equipment as described in any of the above-disclosed embodiments, and therefore has all the beneficial effects of the balance valve assembly for refrigeration equipment as described in any of the above-disclosed embodiments, which will not be repeated here.

[0150] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A balancing valve assembly for a refrigeration equipment, the refrigeration equipment including a housing, characterized in that, The balance valve assembly includes: The valve body is used for installation in the enclosure. The valve body is constructed to have a channel connecting the inside of the enclosure with the outside air. A movable element is provided in the channel, and the movable element is movable relative to the valve body between a closed position and an open position; An elastic reset element is located between the moving part and the valve body, and the elastic reset element is located outside the housing; When the moving part is in the closed position, the channel is closed; when the moving part moves relative to the valve body toward the inside of the housing to the open position, the channel is opened to balance the internal and external air pressure, and the elastic reset part is compressed to drive the moving part to reset from the open position to the closed position.

2. The balancing valve assembly for refrigeration equipment according to claim 1, characterized in that, The moving parts include: The button is located at the end of the channel facing the outside of the box, and the button has an air hole that communicates with the channel; The rear plug has its first end connected to the button, and its second end located at the end of the channel facing the inside of the housing. When the moving part is in the closed position, the second end of the rear plug seals with the inner end of the valve body to block the passage; when the moving part moves toward the open position, the second end of the rear plug releases the seal with the inner end of the valve body, so that external air enters the housing through the air hole and the passage in sequence.

3. The balancing valve assembly for refrigeration equipment according to claim 2, characterized in that, The button and the rear plug are detachably connected by threads. By adjusting the threaded connection length between the button and the rear plug, the pre-compression of the elastic reset element can be changed to adjust the pressing force.

4. The balancing valve assembly for refrigeration equipment according to claim 2, characterized in that, The housing includes the casing, and the balance valve assembly also includes: The first embedded pipe is inserted into the housing, and the inner surface of the first embedded pipe is provided with internal threads; The valve body is provided with external threads, and at least a portion of the valve body is located inside the first pre-embedded pipe, and is detachably connected to the first pre-embedded pipe through threaded engagement.

5. The balancing valve assembly for refrigeration equipment according to claim 4, characterized in that, The rear plug has a conical section that gradually slopes outward from the outside of the housing towards the inside, which is used to guide the incoming airflow to the side wall of the first pre-embedded pipe.

6. The balancing valve assembly for refrigeration equipment according to claim 4, characterized in that, The valve body includes: An embedded part is embedded in the first pre-embedded pipe, and an external thread is provided in the embedded part; The extension portion is connected to the embedded portion and protrudes from the first pre-embedded pipe. The outer diameter of the extension portion is larger than the inner diameter of the first pre-embedded pipe.

7. The balancing valve assembly for refrigeration equipment according to claim 6, characterized in that, The end face of the extension portion facing the housing has a first groove, which extends circumferentially along the extension portion; the balance valve assembly also includes: A first sealing gasket, embedded in a first groove, is used to abut against a first pre-embedded pipe or housing to achieve a seal; and / or, The rear plug is provided with a second groove, which extends circumferentially along the rear plug. The balance valve assembly also includes: The second sealing gasket is embedded in the second groove and is used to abut against the valve body to achieve a seal.

8. The balancing valve assembly for refrigeration equipment according to claim 4, characterized in that, The enclosure also includes an inner liner, and a foaming space is provided between the outer shell and the inner liner. The balance valve assembly also includes: The second pre-embedded pipe is used to be installed inside the inner liner; The connecting pipe is connected at one end to the first pre-embedded pipe and at the other end to the second pre-embedded pipe; The first embedded pipe is provided with a first limiting part, and the second embedded pipe is provided with a second limiting part. The first limiting part and the second limiting part respectively limit and cooperate with the two ends of the connecting pipe to fix the connecting pipe between the first embedded pipe and the second embedded pipe. The length of the connecting pipe is configured to be selectable according to the thickness of the foam layer of the box.

9. The balancing valve assembly for refrigeration equipment according to claim 8, characterized in that, The first embedded pipe is provided with a first snap-fit ​​portion, and the housing is provided with a first snap-fit ​​mating portion. The first snap-fit ​​portion engages with the first snap-fit ​​mating portion to restrict the first embedded pipe from moving away from the foaming space along the axial direction and to restrict the first embedded pipe from rotating in the circumferential direction; and / or, The second embedded pipe is provided with a second snap-fit ​​part, and the inner liner is provided with a second snap-fit ​​mating part. The second snap-fit ​​part and the second snap-fit ​​mating part snap-fit ​​together to restrict the second embedded pipe from moving away from the foaming space along the axial direction and to restrict the second embedded pipe from rotating in the circumferential direction.

10. The balancing valve assembly for refrigeration equipment according to claim 9, characterized in that, The first snap-fit ​​part includes a first latch; the first snap-fit ​​part includes a first inverted snap-fit ​​structure, the first inverted snap-fit ​​structure including a plurality of first snap-fit ​​surfaces arranged in a stepped manner along the direction of the shell towards the foaming space; when the first inverted snap-fit ​​structure is inserted into the first latch, according to the thickness of the shell, one of the plurality of first snap-fit ​​surfaces engages with the corresponding first latch; and / or, The second snap-fit ​​part includes a second snap-fit ​​opening; the second snap-fit ​​part includes a second inverted snap-fit ​​structure, the second inverted snap-fit ​​structure includes a plurality of second snap-fit ​​surfaces arranged in a stepped manner along the direction of the inner liner toward the foaming space; when the second inverted snap-fit ​​structure is inserted into the second snap-fit ​​opening, according to the thickness of the inner liner, one of the plurality of second snap-fit ​​surfaces snaps into the corresponding second snap-fit ​​opening.

11. The balancing valve assembly for refrigeration equipment according to claim 8, characterized in that, The first embedded pipe, the connecting pipe, and the second embedded pipe form a through mounting hole. After the valve body, the moving part, and the elastic reset part are removed from the first embedded pipe, the mounting hole is used for the test cable to pass through, so as to be used as a test hole.

12. A refrigeration device, characterized in that, include: The enclosure has an opening that connects the inside of the enclosure to the outside of the enclosure; The balance valve assembly for a refrigeration device as described in any one of claims 1 to 11 is provided at the opening.

Images