Liquid accumulator

Abstract

The utility model relates to a liquid storage device which comprises a barrel and a second end cover, the barrel is provided with a first opening, the second end cover is provided with a second port, the second port is inserted into the barrel through the first opening and fixed to the barrel through laser welding, the extension length of an overlapping area between the second port and the barrel is L1, and L1 is larger than or equal to 2mm and smaller than or equal to 3mm. According to the liquid storage device, it can be guaranteed that the end cover and the cylinder body are welded firmly, and meanwhile the cost of the end cover and the cylinder body can be reduced.

Description

Technical Field

[0001] The present application relates to the field of liquid storage devices for refrigeration systems, and in particular to a liquid storage device. Background Art

[0002] In a refrigeration system, a liquid accumulator is used to store liquid refrigerant of the refrigeration system. A conventional liquid accumulator includes a cylinder and an end cover. The end cover is used to form a cavity with the cylinder, and the cavity is used to store the liquid refrigerant.

[0003] The end cap and the barrel are typically secured by brazing. This requires an overlap of 8 to 10 mm to accommodate the molten solder, but this can lead to higher costs for the end cap and barrel. Alternatively, the end cap and barrel can be secured by laser welding. Laser welding is autogenous, so it can create a relatively short overlap between the end cap and the barrel, saving costs. However, ensuring sufficient penetration between the end cap and the barrel to ensure a secure weld is a technical challenge that needs to be addressed. Utility Model Content

[0004] Based on this, it is necessary to provide a liquid reservoir to ensure that the end cover and the cylinder are firmly welded while reducing the cost of the end cover and the cylinder.

[0005] A liquid reservoir includes a cylinder and a second end cover, wherein the cylinder has a first opening, the second end cover has a second port, the second port is inserted into the cylinder through the first opening and fixed to the cylinder by laser welding, wherein the extension length of the overlapping area between the second port and the cylinder is L1, 2mm≤L1≤3mm.

[0006] In one embodiment, the outer diameter of the second end cover is reduced at the second port so that the second end cover forms a first step structure at a transition position close to the second port, and the first step structure is arranged toward the cylinder; when the second port is inserted into the cylinder through the first opening, the first step structure cooperates with the edge stop of the first opening.

[0007] In one embodiment, the liquid reservoir further comprises a first end cap, the barrel has a second opening opposite to the first opening, the first end cap is configured to have a connecting flare, the connecting flare is sleeved on the outer periphery of the barrel at the second opening, and is fixed to the barrel by laser welding, wherein the extension length of the overlapping area between the connecting flare and the barrel is L 21 , and 2mm≤L 21 ≤4mm.

[0008] In one embodiment, the liquid reservoir also includes a filter screen, and the inner diameter of the first end cover increases at the connecting flare so that the first end cover forms a second step structure at a transition position close to the connecting flare, and the second step structure is arranged toward the cylinder, and the filter screen is fixed to the second step structure. When the connecting flare is sleeved on the outer periphery of the cylinder, the cylinder abuts against the filter screen.

[0009] In one embodiment, the liquid reservoir further includes a first end cap, the barrel has a second opening opposite to the first opening, the first end cap has a first port, the first port is inserted into the barrel through the second opening and fixed to the barrel by laser welding, wherein the length of the overlapping area between the first port and the barrel is L 22 , 2mm≤L 22 ≤3mm; the outer diameter of the first end cover is reduced at the first port so that the first end cover forms a third step structure at a transition position close to the first port, and the third step structure is arranged toward the cylinder. When the first port is inserted into the cylinder through the second opening, the third step structure cooperates with the edge stop of the second opening.

[0010] In one embodiment, the liquid reservoir further includes a filter, the first end cover and the second end cover are both configured to have a second port, an assembly groove is provided on the inner wall of the cylinder near the first end cover, and the filter is clamped in the assembly groove.

[0011] In one embodiment, the liquid storage device further includes an air inlet pipe and an air outlet pipe, and the cylinder, the first end cover and the second end cover are arranged to form a cavity; the first end cover is provided with a first mounting hole, the air inlet pipe is installed in the first mounting hole and connected to the cavity, the second end cover is provided with a second mounting hole, the air outlet pipe is installed in the second mounting hole and connected to the cavity.

[0012] In one embodiment, the first mounting hole is configured as a flanged hole, and the flange of the first mounting hole protrudes from the surface of the first end cover; and / or, the second mounting hole is configured as a flanged hole, and the flange of the second mounting hole protrudes from the surface of the second end cover.

[0013] In one embodiment, the air intake pipe has a mounting section, at least a portion of which is inserted into the first mounting hole and fixed to the hole wall of the first mounting hole by laser welding; wherein the depth of the mounting section inserted into the first mounting hole is L3, 2mm≤L3≤4mm; and the length of the mounting section outside the first mounting hole is L4, 1mm≤L4.

[0014] In one embodiment, the air outlet pipe includes a straight pipe section and a curved pipe section, the curved pipe section is located outside the cavity, one end of the straight pipe section is connected to the curved pipe section, and the other end extends into the cavity through the second mounting hole, and the straight pipe section and the hole wall of the second mounting hole are fixed by laser welding; wherein, the overlap length of the straight pipe section and the hole wall of the second mounting hole is L5, 2mm≤L5≤4mm; the end of the straight pipe section close to the curved pipe section extends out of the second mounting hole, and the length of the end of the straight pipe section close to the curved pipe section extending out of the second mounting hole is L6, 1mm≤L6.

[0015] In one embodiment, the material of the air inlet pipe and the air outlet pipe is stainless steel or carbon steel, and the thickness of the air inlet pipe and the air outlet pipe is between 0.8mm and 1.2mm; the thickness of the cylinder, the first end cover and the second end cover is between 1.5mm and 2.5mm.

[0016] It should be noted that laser welding uses a laser beam as energy. The laser beam acts directly on the surface of the workpiece, causing the workpiece to partially melt to form a molten pool. After cooling, a weld is formed without the need to add solder or flux. Therefore, when laser welding is used to connect the second end cover and the cylinder, there is no need to reserve an excessively long overlapping area to accommodate the molten solder. The extension length of the overlapping area between the second port and the cylinder can be made relatively shorter, that is, L1≤4mm. In this way, compared with the related structure, an overlapping area of ​​8mm to 10mm is required between the end cover and the cylinder, which can significantly reduce the material cost of the second end cover and the cylinder. In addition, setting 2mm≤L1 is conducive to ensuring a 1mm to 2mm penetration depth between the second end cover and the cylinder, so that the second end cover and the cylinder are firmly welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A cross-sectional view of the liquid reservoir of Example 1 provided in this application;

[0019] Figure 2 This is a cross-sectional view of the liquid reservoir of Example 2 provided in this application.

[0020] Figure markings: 100, liquid reservoir; 10, cylinder; 111, first opening; 112, second opening; 12, assembly groove; 20, first end cover; 21, first mounting hole; 22, connecting flare; 23, second step structure; 24, first port; 25, third step structure; 30, second end cover; 31, second port; 32, first step structure; 33, second mounting hole; 40, cavity; 50, air inlet pipe; 51, mounting section; 52, middle section; 53, interface section; 60, air outlet pipe; 61, straight pipe section; 62, curved pipe section; 70, filter. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0024] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0026] The present application provides a liquid reservoir 100, which includes a barrel 10, a first end cover 20 and a second end cover 30. The barrel 10 has a first opening 111 and a second opening 112 at both ends, respectively. The first end cover 20 is connected to the second opening 112, and the second end cover 30 is connected to the first opening 111. A cavity 40 is formed between the first end cover 20, the second end cover 30 and the barrel 10.

[0027] Example 1

[0028] See also Figure 1 The second end cover 30 is configured to have a second port 31, which is inserted into the cylinder 10 through the first opening 111 and fixed to the cylinder 10 by laser welding, wherein the extension length of the overlapping area between the second port 31 and the cylinder 10 is L1, and 2mm≤L1≤4mm.

[0029] It should be noted that laser welding uses a laser beam as energy. The laser beam acts directly on the surface of the workpiece, causing the workpiece to partially melt to form a molten pool. After cooling, a weld is formed without the need to add solder or flux. Therefore, when laser welding is used to connect the second end cap 30 and the cylinder 10, there is no need to reserve an excessively long overlapping area to accommodate the molten solder. The extension length of the overlapping area between the second port 31 and the cylinder 10 can be made relatively shorter, that is, L1≤4mm. In this way, compared with the related structure, an overlapping area of ​​8mm to 10mm is required between the end cap and the cylinder, which can significantly reduce the material cost of the second end cap 30 and the cylinder 10. In addition, setting 2mm≤L1 is conducive to ensuring that a 1mm to 2mm penetration depth is formed between the second end cap 30 and the cylinder 10, so that the second end cap 30 and the cylinder 10 are firmly welded.

[0030] Furthermore, the outer diameter of the second end cap 30 decreases at the second port 31, so that the second end cap 30 forms a first step structure 32 at a transition position near the second port 31. The first step structure 32 is arranged toward the barrel 10. When the second port 31 of the second end cap 30 is inserted into the barrel 10 through the first opening 111, the first step structure 32 engages with the corresponding edge of the first opening 111. It will be understood that during the assembly process of the second end cap 30 and the barrel 10, the first step structure 32 and the edge of the first opening 111 of the barrel 10 play a role in rapid installation and positioning.

[0031] Optionally, the first step structure 32 is formed by turning the outer wall of the second end cover 30. Specifically, the wall thickness of the second port 31 is reduced by turning, and the difference in wall thickness between the second port 31 and the adjacent part forms the first step structure 32. The second port 31 and the first step structure 32 can also be formed by shrinking the end of the second end cover 30 toward the inside through a closing or extrusion process.

[0032] The first end cap 20 is configured to have a connecting flare 22, which is sleeved on the outer periphery of the cylinder 10 at the second opening 112 and fixed to the cylinder 10 by laser welding. The extending length of the overlapping area between the connecting flare 22 and the cylinder 10 is L. 21 , and 2mm≤L 21 ≤4mm. Similarly, the first end cap 20 is fixed to the cylinder 10 at the connection flare 22 by laser welding. Since laser welding is self-melting welding, no solder is required, and therefore no long overlapping area is required to accommodate the molten solder. A relatively short overlapping area can be formed between the connection flare 22 and the cylinder 10, i.e., L 21 ≤4mm, thus, compared with the related structure, an overlap area of ​​8mm to 10mm is required between the end cap and the cylinder, which can significantly reduce the material cost of the first end cap 20 and the cylinder 10. 21 , which is conducive to ensuring that a fusion depth of 1 mm to 2 mm is formed between the first end cover 20 and the cylinder 10, so that the first end cover 20 and the cylinder 10 are firmly welded.

[0033] The liquid reservoir 100 also includes a filter screen 70. The inner diameter of the first end cap 20 increases at the connection flare 22, so that the first end cap 20 forms a second step structure 23 at a transition position near the connection flare 22. The second step structure 23 is arranged toward the barrel 10. The filter screen 70 is fixed to the second step structure 23. When the connection flare 22 is sleeved on the outer periphery of the barrel 10, the barrel 10 abuts against the filter screen 70. By making the barrel 10 abut against the filter screen 70, the filter screen 70 is installed more securely.

[0034] Specifically, during the assembly process of the liquid reservoir 100, the filter screen 70 can be first welded and fixed to the second step structure 23, and then the first end cover 20 can be sleeved on the outer periphery of the cylinder 10 through the connecting flare 22, and the cylinder 10 can be pressed against the filter screen 70, and finally the connecting flare 22 and the cylinder 10 can be fixed by laser welding.

[0035] The liquid reservoir 100 further includes an air inlet pipe 50 and an air outlet pipe 60. The first end cap 20 defines a first mounting hole 21, through which the air inlet pipe 50 is mounted and communicates with the cavity 40. The second end cap 30 defines a second mounting hole 33, through which the air outlet pipe 60 is mounted and communicates with the cavity 40. A filter 70 is used to filter the medium entering the cavity 40 through the air inlet pipe 50.

[0036] The first mounting hole 21 is configured as a flanged hole, with the flange of the first mounting hole 21 protruding from the surface of the first end cover 20; and / or the second mounting hole 33 is configured as a flanged hole, with the flange of the second mounting hole 33 protruding from the surface of the second end cover 30. That is, the first mounting hole 21 can be configured as a flanged hole, with the flange of the first mounting hole 21 protruding from the surface of the first end cover 20. In this way, the contact area between the hole wall of the first mounting hole 21 and the air intake pipe 50 can be increased, thereby allowing the air intake pipe 50 to be more securely mounted to the first mounting hole 21; or the second mounting hole 33 can be configured as a flanged hole, with the flange of the second mounting hole 33 protruding from the surface of the second end cover 30. In this way, the contact area between the hole wall of the second mounting hole 33 and the air outlet pipe 60 can be increased, thereby allowing the air outlet pipe 60 to be more securely mounted to the second mounting hole 33; or further, both the first mounting hole 21 and the second mounting hole 33 can be configured as flanged holes.

[0037] The flange of the first mounting hole 21 may extend toward the inside of the cavity 40 or away from the cavity 40 . Similarly, the flange of the second mounting hole 33 may extend toward the inside of the cavity 40 or away from the cavity 40 .

[0038] For example, in one embodiment, Figure 1 As shown, the flange of the first mounting hole 21 extends in a direction away from the cavity 40 , and the second mounting hole 33 extends toward the interior of the cavity 40 .

[0039] Furthermore, the intake pipe 50 has a mounting section 51, at least a portion of which is inserted into the first mounting hole 21 and secured to the wall of the first mounting hole 21 by laser welding. The depth of insertion of the mounting section 51 into the first mounting hole 21 is L3, with a value of 2mm≤L3≤4mm. It is understood that setting 2mm≤L3 helps ensure that the laser welding depth between the cylinder 10 and the intake pipe 50 is between 1mm and 2mm, and setting L3≤4mm helps save material costs for the cylinder 10 and the intake pipe 50. For example, the value of L3 can be 2mm, 3mm, 3.5mm, or 4mm. Furthermore, the length of the mounting section 51 outside the first mounting hole 21 is L4, with a value of 1mm≤L4. This configuration facilitates the melting of the end of the flange of the first mounting hole 21 at the surface of the mounting section 51 protruding from the first mounting hole 21, thereby facilitating the securing of the intake pipe 50 to the cylinder 10 by laser welding.

[0040] The intake pipe 50 also includes an intermediate section 52 and an interface section 53. The mounting section 51 and interface section 53 are located at either end of the intermediate section 52, respectively. The diameters of both the mounting section 51 and interface section 53 are larger than those of the intermediate section 52. In other words, the intake pipe 50 is flared at both ends to form the interface section 53 and the mounting section 51, respectively. This allows external pipes inserted into the interface section 53 to stop at the junction of the interface section 53 and the intermediate section 52. The mounting section 51, intermediate section, and interface section 53 form a single, integrated structure.

[0041] The outlet pipe 60 includes a straight pipe section 61 and a curved pipe section 62. The curved pipe section 62 is located outside the cavity 40. One end of the straight pipe section 61 is connected to the curved pipe section 62, and the other end extends into the cavity 40 through the second mounting hole 33. The straight pipe section 61 is fixed to the wall of the second mounting hole 33 by laser welding. The overlap length between the straight pipe section 61 and the wall of the second mounting hole 33 is L5, with a value of 2mm≤L5≤4mm. It is understood that setting 2mm≤L5 helps ensure that the laser welding depth between the cylinder 10 and the outlet pipe 60 is between 1mm and 2mm, and setting L5≤4mm helps save material costs for the cylinder 10 and the outlet pipe 60. Furthermore, the end of the straight pipe section 61 near the curved pipe section 62 extends out of the second mounting hole 33 by a length L6, with a value of 1mm≤L6. This prevents the curved pipe section 62 from interfering with the positioning of the laser welding gun when the outlet pipe 60 rotates. The straight pipe section 61 and the curved pipe section 62 are an integrated structure.

[0042] The inlet pipe 50 and the outlet pipe 60 are both made of stainless steel or carbon steel, and each has a thickness between 0.8 mm and 1.2 mm. Using stainless steel or carbon steel to make the inlet pipe 50 and the outlet pipe 60 can reduce the material cost of the liquid reservoir 100. The barrel 10, the first end cap 20, and the second end cap 30 each have a thickness between 1.5 mm and 2.5 mm.

[0043] Example 2

[0044] See also Figure 2 The liquid reservoir 100 of this embodiment is similar to that of the first embodiment, and both include a cylinder 10, a first end cover 20, a second end cover 30, an air inlet pipe 50, an air outlet pipe 60, and a filter screen 70. The second end cover 30 is configured to have a second port 31, which is inserted into the cylinder 10 through the first opening 111 and fixed to the cylinder 10 by laser welding, wherein the extension length of the overlapping area between the second port 31 and the cylinder 10 is L1, and 2mm≤L1≤4mm, and a first step structure 32 is provided on the second end cover 30. The similarities are not repeated here, and the difference is that the first end cover 20 is configured to have a first port 24, which is inserted into the cylinder 10 through the second opening 112 and fixed to the cylinder 10 by laser welding, wherein the length of the overlapping area between the first port 24 and the cylinder 10 is L 22 , 2mm≤L 22 ≤3mm.

[0045] Furthermore, the outer diameter of the first end cover 20 is reduced at the first port 24 so that the first end cover 20 forms a third step structure 25 at a transition position close to the first port 24. The third step structure 25 is arranged toward the cylinder 10. When the first port 24 is inserted into the cylinder 10 through the second opening 112, the third step structure 25 cooperates with the edge stop of the second opening 112.

[0046] Furthermore, the installation method of the filter screen 70 is also different. A mounting groove 12 is provided on the inner wall of the cylinder 10 near the first end cap 20, and the filter screen 70 is secured within the mounting groove 12. Specifically, the cylinder 10 contracts radially inward to form two constrictions. These constrictions are spaced apart axially along the cylinder 10 and surround the mounting groove 12. This reduces the number of welding steps between the filter screen 70 and the cylinder 10.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0048] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A liquid reservoir, characterized in that: The liquid reservoir (100) comprises a barrel (10) and a second end cover (30), wherein the barrel (10) has a first opening (111), and the second end cover (30) has a second port (31), and the second port (31) is inserted into the barrel (10) through the first opening (111) and fixed to the barrel (10) by laser welding, wherein the extension length of the overlapping area between the second port (31) and the barrel (10) is L1, and 2mm≤L1≤3mm.

2. The liquid reservoir according to claim 1, wherein The outer diameter of the second end cover (30) is reduced at the second port (31), so that the second end cover (30) forms a first step structure (32) at a transition position close to the second port (31), and the first step structure (32) is arranged toward the barrel (10); When the second port (31) is inserted into the cylinder (10) through the first opening (111), the first step structure (32) cooperates with the edge stop of the first opening (111).

3. The liquid reservoir according to claim 1, wherein: The liquid storage device (100) further includes a first end cover (20), and the cylinder (10) has a second opening (112) arranged opposite to the first opening (111); The first end cover (20) is configured to have a connecting flare (22), the connecting flare (22) is sleeved on the outer periphery of the cylinder (10) at the second opening (112), and is fixed to the cylinder (10) by laser welding, wherein the extension length of the overlapping area between the connecting flare (22) and the cylinder (10) is L 21 , and 2mm≤L 21 ≤4mm.

4. The liquid reservoir according to claim 3, characterized in that The liquid storage container (100) further includes a filter screen (70); the inner diameter of the first end cover (20) increases at the connection flare (22), so that the first end cover (20) forms a second step structure (23) at a transition position close to the connection flare (22); the second step structure (23) is arranged toward the cylinder (10); the filter screen (70) is fixed to the second step structure (23); when the connection flare (22) is sleeved on the outer periphery of the cylinder (10), the cylinder (10) abuts against the filter screen (70).

5. The liquid reservoir according to claim 1, wherein The liquid reservoir (100) further comprises a first end cap (20), the barrel (10) having a second opening (112) arranged opposite to the first opening (111), the first end cap (20) having a first port (24), the first port (24) being inserted into the barrel (10) through the second opening (112) and being fixed to the barrel (10) by laser welding, wherein the length of the overlapping area between the first port (24) and the barrel (10) is L 22 , 2mm≤L 22 ≤3mm; The outer diameter of the first end cover (20) is reduced at the first port (24), so that the first end cover (20) forms a third step structure (25) at a transition position close to the first port (24), and the third step structure (25) is arranged toward the cylinder (10). When the first port (24) is inserted into the cylinder (10) through the second opening (112), the third step structure (25) cooperates with an edge stop of the second opening (112).

6. The liquid reservoir according to claim 5, characterized in that The liquid storage container (100) further includes a filter screen (70), the first end cover (20) and the second end cover (30) are both configured to have a second port (31), an assembly groove (12) is provided on the inner wall of the cylinder (10) near the first end cover (20), and the filter screen (70) is clamped in the assembly groove (12).

7. The liquid reservoir according to any one of claims 3 to 6, characterized in that: The liquid storage device (100) further includes an air inlet pipe (50) and an air outlet pipe (60), and the cylinder (10), the first end cover (20) and the second end cover (30) are arranged to form a cavity (40); The first end cover (20) is provided with a first mounting hole (21), the air inlet pipe (50) is installed in the first mounting hole (21) and is connected to the cavity (40), and the second end cover (30) is provided with a second mounting hole (33), the air outlet pipe (60) is installed in the second mounting hole (33) and is connected to the cavity (40).

8. The liquid reservoir according to claim 7, wherein: The first mounting hole (21) is configured as a flanged hole, and the flange of the first mounting hole (21) is protruding from the surface of the first end cover (20); And / or, the second mounting hole (33) is configured as a flanged hole, and the flange of the second mounting hole (33) is protruding from the surface of the second end cover (30).

9. The liquid reservoir according to claim 8, characterized in that The air intake pipe (50) has a mounting section (51), at least a portion of the mounting section (51) is inserted into the first mounting hole (21) and fixed to the hole wall of the first mounting hole (21) by laser welding; The depth of the installation section (51) inserted into the first installation hole (21) is L3, 2mm≤L3≤4mm; the length of the installation section (51) outside the first installation hole (21) is L4, 1mm≤L4.

10. The liquid reservoir according to claim 8, wherein The air outlet pipe (60) includes a straight pipe section (61) and a curved pipe section (62), wherein the curved pipe section (62) is located outside the cavity (40), one end of the straight pipe section (61) is connected to the curved pipe section (62), and the other end extends into the cavity (40) through the second mounting hole (33), and the straight pipe section (61) and the hole wall of the second mounting hole (33) are fixed by laser welding; The overlapping length between the straight pipe section (61) and the wall of the second mounting hole (33) is L5, 2mm≤L5≤4mm; the end of the straight pipe section (61) close to the curved pipe section (62) extends out of the second mounting hole (33), and the length of the end of the straight pipe section (61) close to the curved pipe section (62) extending out of the second mounting hole (33) is L6, 1mm≤L6.

11. The liquid reservoir according to claim 7, wherein The material of the air inlet pipe (50) and the air outlet pipe (60) is stainless steel or carbon steel, and the thickness of the air inlet pipe (50) and the air outlet pipe (60) is between 0.8 mm and 1.2 mm; the thickness of the cylinder (10), the first end cover (20) and the second end cover (30) is between 1.5 mm and 2.5 mm.

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