Expansion tank and refrigerating system thereof

Abstract

The utility model relates to the technical field of refrigerating systems, in particular to an expansion tank and a refrigerating system thereof. The expansion tank comprises a tank body and a valve core, a first mounting part is arranged at the top of the tank body, and a through hole communicated with the cavity is formed in the first mounting part; the valve core assembly comprises a main body part and a valve core, a welding structure is arranged between the main body part and the first mounting part, and the main body part and the first mounting part are in sealed connection through the welding structure; and the valve core moves in the main body part to open or block the through hole so as to change the communication state or the separation state of the cavity and the outside of the tank body. In this way, the gas is filled into the cavity through the valve core, so that the pre-inflation process is completed. The welding structure is formed by machining through the welding technology, the welding structure is formed after the welding flux is melted, and the sealing performance between the valve core assembly and the top of the tank body is better through welding.

Description

Expansion tank and its refrigeration system Technical Field

[0001] This utility model relates to the field of refrigeration system technology, and in particular to an expansion tank and its refrigeration system. Background Technology

[0002] As a core component for pressure buffering in a refrigeration system, the sealing performance of the expansion tank directly determines the long-term stability and safety of the system. Traditional expansion tanks have a valve core structure installed at the top of their cylinder. The body seal between the cylinder and the valve core structure is usually achieved by using a rubber sealing ring or O-ring compression structure, which fills the gap between the valve core structure and the through hole on the cylinder through elastic deformation to achieve a seal.

[0003] However, even with sealing rings, there are still very small gaps in the sealing connection, and the pre-charge gas in the expansion tank will still leak at a very slow rate. This means that the pre-charge gas in the expansion tank needs to be replenished every year. Under low-temperature conditions, the sealing rings and O-rings may deform, leading to seal failure. After the above seals fail, the pre-charge gas in the expansion tank will leak, which will cause the product performance to fail. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides an expansion tank.

[0005] An expansion tank includes: a tank body having a chamber, a first mounting portion being provided at the top of the tank body, the first mounting portion having a through hole communicating with the chamber; and a valve core assembly including a main body and a valve core, wherein a welding structure is provided between the main body and the first mounting portion, and the main body and the first mounting portion are sealed together by the welding structure; wherein the valve core moves within the main body to open or block the through hole, thereby changing the communication state or isolation state between the chamber and the outside of the tank body.

[0006] With this configuration, gas is introduced into the chamber through the valve core assembly to complete the pre-inflation process. The welded structure is formed through a welding process; the welded structure is formed after the solder melts, and the welding improves the seal between the valve core assembly and the top of the tank.

[0007] In one embodiment, the top of the tank is recessed inward to form a first mounting portion, and the through hole is formed at the bottom of the first mounting portion.

[0008] In one embodiment, the edge of the through hole wall bends away from the chamber and forms an annular protrusion, and along the axis of the tank, the end face of the annular protrusion away from the chamber is higher than the top of the tank.

[0009] In one embodiment, at least a portion of the cross-section of the first mounting portion is arc-shaped, trapezoidal, or stepped.

[0010] In one embodiment, the depth of the first mounting portion along the axis of the tank is 0.5mm-2mm, and the width of the first mounting portion along the radial direction of the tank is 1mm-3mm.

[0011] In one embodiment, the tank body, the through hole, and the first mounting part are all coaxially arranged.

[0012] In one embodiment, the welded structure is formed by a high-frequency welding process or a laser welding process.

[0013] In one embodiment, the tank includes a first tank, a second tank, and a liner, wherein the first tank and the second tank are disposed opposite to each other and are sealed and welded to form the tank, and the liner is located in the chamber and communicates with an external medium.

[0014] In one embodiment, the expansion tank further includes a cover that is threadedly connected to the valve core and covers and seals the end of the valve core away from the tank.

[0015] This utility model also provides a refrigeration system, including the expansion tank as described above.

[0016] Compared to existing technologies, this invention optimizes the traditional sealing ring connection method by using a welded structure connection, which avoids failure caused by vibration, temperature changes, and thermal shock. The weld, through the interpenetration of materials, provides a strong and reliable bond. Gas is injected into the chamber through the valve core to complete the pre-inflation process. The welded structure is formed through a welding process; the welded structure is formed after the solder melts, resulting in better sealing between the valve core assembly and the top of the tank. Attached Figure Description

[0017] Figure 1 is a structural schematic diagram of one embodiment of the expansion tank provided by this utility model;

[0018] Figure 2 is a magnified view of part A in Figure 1.

[0019] The symbols in the diagram represent the following meanings:

[0020] 100. Expansion tank; 10. Tank body; 111. First mounting part; 112. Annular protrusion; 12. Through hole; 13. First tank body; 14. Second tank body; 20. Valve core assembly; 21. Main body; 22. Valve core; 30. Gasket; 40. Cover. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0026] This utility model provides an expansion tank 100, which is applied in a refrigeration system. Its valve core assembly 20 is connected to the tank body 10 by welding. Compared with the sealing method of sealing ring, it can avoid failure caused by vibration, temperature change, thermal shock and other factors. Welding is a strong and reliable connection through the mutual penetration between materials.

[0027] Please refer to Figures 1-2. An expansion tank 100 includes a tank body 10 and a valve core assembly 20. The top of the tank body 10 is provided with a first mounting part 111, and the first mounting part 111 has a through hole 12 that communicates with the chamber. The valve core assembly 20 includes a main body 21 and a valve core 22. A welding structure is provided between the main body 21 and the first mounting part 111, and the main body 21 and the first mounting part 111 are sealed together by the welding structure. The valve core 22 moves within the main body 21 to open or block the through hole 12, thereby changing the communication state or isolation state between the chamber and the outside of the tank body 10.

[0028] Thus, gas is injected into the chamber through the valve core assembly 20 to complete the pre-inflation process. The welded structure is formed through a welding process; the welded structure is formed after the solder melts, and the welding improves the sealing between the valve core assembly 20 and the top of the tank body 10. In addition, as mentioned above, the welding penetrates and connects through the gaps between the various structures, making the connection strength between the valve core assembly 20 and the tank body 10 higher, and its ability to withstand vibration and temperature changes during the operation of the expansion tank 100 is also stronger.

[0029] Preferably, in this embodiment, the welded structure is formed by high-frequency welding. In other embodiments, high-frequency welding can be replaced by laser welding. The welding sealing method can avoid internal gas leakage, which is significantly different from the soft sealing structure used in traditional expansion tanks 100. The expansion tank 100 provided in this embodiment has a helium leakage rate of less than 4×10^(-9) Pa·m³ / s at low temperatures. High-frequency welding generates a skin effect at the welding interface through high-frequency induced current, and only rapidly heats the contact area between the valve core assembly 20 and the through hole 12, avoiding thermal damage to the internal diaphragm or air bladder of the expansion tank 100 caused by overall heat input.

[0030] Furthermore, the top of the tank body 10 is recessed inward to form a first mounting portion 111, a through hole 12 is formed at the bottom of the first mounting portion 111, and a welded structure is formed on the side of the first mounting portion 111 facing away from the chamber, with the main body 21 abutting against the welded structure. In this way, the first mounting portion 111 can facilitate the full penetration of solder into the gap between the two, and can also increase the actual welding area between the two, thereby improving the sealing and fixing effect.

[0031] Of course, in other embodiments, the first mounting part 111 may not be provided, and the through hole 12 may be directly formed by the arc-shaped can body 10.

[0032] Furthermore, the edge of the through hole 12 bends away from the chamber, forming an annular protrusion 112. Along the axis of the tank body 10, the end face of the annular protrusion 112 away from the chamber is higher than the top of the tank body 10. Thus, the annular protrusion 112 can block the flow of solder, preventing solder from flowing from the through hole 12 into the chamber and affecting the use of the expansion tank 100. It should be explained that the top of the tank body 10 refers to the end of the tank body 10 closest to the valve core assembly 20 along the axial direction of the tank body 10.

[0033] For example, at least a portion of the cross-section of the first mounting portion 111 is arc-shaped, trapezoidal, or stepped. This facilitates solder flow and allows for easy installation and contact with the valve core assembly 20.

[0034] Along the axis of the tank body 10, the depth of the first mounting portion 111 is 0.5mm-2mm, and along the radial direction of the tank body 10, the width of the first mounting portion 111 is 1mm-3mm. This design prevents the first mounting portion 111 from being too shallow to achieve the desired technical effect and hindering solder flow, while also avoiding the problem of the first mounting portion 111 being too deep, which would cause difficulties in processing the tank body 10 and affect its structural strength. Similarly, setting the width of the first mounting portion 111 within a reasonable range ensures its technical effectiveness while minimizing its impact on the processing and structural strength of the tank body 10.

[0035] For example, the depth of the first mounting portion 111 is set to 1.0mm, 1.5mm or 1.7mm, etc., and the width of the first mounting portion 111 is set to 1mm, 1.5mm or 2.4mm, etc., but is not limited to the above-mentioned endpoint values.

[0036] Preferably, in this embodiment, the tank body 10, the through hole 12, and the first mounting part 111 are all coaxially arranged. In this way, the overall integrity of the expansion tank 100 is better.

[0037] The tank 10 includes a first tank 13, a second tank 14, and a liner 30. The first tank 13 and the second tank 14 are arranged opposite each other and sealed by welding to form the tank 10. The liner 30 is located in the chamber and communicates with the external medium. The first tank 13 and the second tank 14 are separate composite structures, allowing for separate processing to reduce manufacturing complexity. When the liquid in the system expands due to heat or the pressure increases, excess liquid is forced into the expansion tank 100, compressing the pre-filled gas (such as nitrogen) or squeezing the liner 30. The gas or the liner 30 contracts to absorb the volume change, thus buffering the pressure rise. When the system pressure drops, the compressed gas or the liner 30 expands, pushing the stored liquid back into the system to maintain pressure stability. This process dynamically balances the system pressure through the liner 30, preventing damage to pipelines or equipment due to pressure fluctuations.

[0038] The expansion tank 100 also includes a cover 40, which is threadedly connected to the valve core assembly 20 and covers and seals the end of the valve core assembly 20 away from the tank 10. In this way, the cover 40 can protect the valve core assembly 20 from the external environment and extend its service life.

[0039] Understandably, in other embodiments, the cover 40 can also be fixed by connecting to the tank 10 to protect the internal valve core assembly 20, or connected to the valve core assembly 20 by interference fit, snap-fit, or other means, and is not limited to the threaded fit described above.

[0040] This utility model also provides a refrigeration system, including the expansion tank 100 as described above.

[0041] Compared to existing technologies, this invention optimizes the traditional sealing ring connection method by using a welded structure connection, which avoids failure caused by vibration, temperature changes, thermal shock, etc.; the welding achieves a strong and reliable connection through the interpenetration of materials. Gas is injected into the chamber through the valve core assembly 20 to complete the pre-inflation process. The welded structure is formed through a welding process; the welded structure is formed after the solder melts, and the welding improves the sealing between the valve core assembly 20 and the top of the tank body 10.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An expansion tank, characterized in that, include: The tank (10) has a chamber, and a first mounting part (111) is provided on the top of the tank (10). The first mounting part (111) has a through hole (12) communicating with the chamber. The valve core assembly (20) includes a main body (21) and a valve core (22). A welding structure is provided between the main body (21) and the first mounting part (111), and the main body (21) and the first mounting part (111) are sealed together by the welding structure. The valve core (22) moves within the main body (21) to open or block the through hole (12) to change the communication state or isolation state between the chamber and the outside of the tank (10).

2. The expansion tank according to claim 1, characterized in that, The top of the tank (10) is recessed inward to form a first mounting part (111), and the through hole (12) is opened at the bottom of the first mounting part (111).

3. The expansion tank according to claim 2, characterized in that, The edge of the through hole (12) bends away from the chamber and forms an annular protrusion (112). Along the axis of the tank (10), the end face of the annular protrusion (112) away from the chamber is higher than the top of the tank (10).

4. The expansion tank according to claim 2, characterized in that, At least a portion of the cross-section of the first mounting part (111) is arc-shaped, trapezoidal, or stepped.

5. The expansion tank according to claim 2, characterized in that, Along the axis of the tank body (10), the depth of the first mounting part (111) is 0.5mm-2mm, and along the radial direction of the tank body (10), the width of the first mounting part (111) is 1mm-3mm.

6. The expansion tank according to claim 2, characterized in that, The tank body (10), the through hole (12), and the first mounting part (111) are all coaxially arranged.

7. The expansion tank according to claim 1, characterized in that, The welded structure is formed by high-frequency welding or laser welding.

8. The expansion tank according to claim 1, characterized in that, The tank (10) includes a first tank (13), a second tank (14) and a bladder (30). The first tank (13) and the second tank (14) are arranged opposite to each other and are sealed and welded to form the tank (10). The bladder (30) is located in the chamber and is in communication with the external medium.

9. The expansion tank according to claim 1, characterized in that, The expansion tank also includes a cover (40) which is threaded to the valve core assembly (20) and covers and seals the end of the valve core assembly (20) away from the tank body (10).

10. A refrigeration system, characterized in that, Including the expansion tank as described in any one of claims 1-9.

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