Liquid accumulator, compressor and welding method

Abstract

The invention provides a liquid accumulator, a compressor and a welding method. The liquid accumulator comprises an upper end cover, a middle barrel and a lower end cover. The two ends of the middle barrel are connected with the upper end cover and the lower end cover through laser welding correspondingly. A first overlapping section is arranged at the joint of the middle barrel and the upper end cover, and the upper end cover is located on the outer side of the middle barrel in the first overlapping section; a second overlapping section is arranged at the joint of the middle cylinder and the lower end cover, and the middle cylinder is located on the outer side of the lower end cover in the second overlapping section. According to the configuration, laser welding is used for replacing an original welding process of brazing in a furnace, energy loss is reduced, waste gas cannot be generated, and pollution to the environment is reduced; the upper end cover, the middle barrel and the lower end cover are assembled in a stepped mode, condensation water is prevented from being accumulated on the periphery of the lower end cover, and the service life of the liquid storage device is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a liquid accumulator, a compressor and a welding method. Background Art

[0002] The liquid accumulator mainly plays the roles of storing liquid, separating gas and liquid, and silencing in the compressor. The assembly of the liquid accumulator in the prior art is mainly connected by welding. The existing liquid accumulator mainly has an air inlet pipe, an upper end cover, a middle cylinder body, a filter screen assembly, a partition plate, an inner pipe, a lower end cover and an air outlet pipe. Among them, the air inlet pipe and the upper end cover, and the air outlet pipe and the lower end cover are connected by flame brazing. The upper and lower end covers, the filter screen assembly, the partition plate, the inner pipe, etc. are connected to the middle cylinder body by furnace brazing with a preset copper welding wire. When the compressor operates, liquid is likely to accumulate around the lower end cover, which affects the service life of the liquid accumulator. Moreover, the energy loss of furnace brazing is large, and the waste gas generated is not easy to treat. Summary of the Invention

[0003] The purpose of the present invention is to provide a liquid accumulator, a compressor and a welding method to solve the problems that liquid is likely to accumulate around the lower end cover of the existing liquid accumulator structure, the energy loss of the assembly method using furnace brazing is large, and the waste gas generated is not easy to treat.

[0004] To achieve the above purpose, the present invention provides a liquid accumulator, including: an upper end cover, a middle cylinder body and a lower end cover;

[0005] Both ends of the middle cylinder body are connected to the upper end cover and the lower end cover respectively through laser welding;

[0006] There is a first overlapping section at the connection between the middle cylinder body and the upper end cover, and the upper end cover is located outside the middle cylinder body within the first overlapping section;

[0007] There is a second overlapping section at the connection between the middle cylinder body and the lower end cover, and the middle cylinder body is located outside the lower end cover within the second overlapping section.

[0008] Optionally, the following relationship is satisfied among the length of the first overlapping section in the axial direction of the liquid accumulator, the first penetration depth and the first laser incident angle:

[0009] H1>L1cosα 1

[0010] Wherein:

[0011] H1 is the length of the first overlapping section in the axial direction of the liquid accumulator; L1 is the first penetration depth; α 1 is the first laser incident angle;

[0012] The following relationship is satisfied among the length of the second overlapping section in the axial direction of the liquid storage container, the second melting depth, and the second laser incident angle:

[0013] H2>L2cosα 2

[0014] Where:

[0015] H2 is the length of the first overlapping section in the axial direction of the liquid storage container; L2 is the second melting depth; α 2 is the second laser incident angle.

[0016] Optionally, the maximum inner diameter of the upper end cap is R1, the outer diameter of the middle cylinder is R2, the inner diameter of the middle cylinder is R3, and the maximum outer diameter of the lower end cap is R4, then R1>R2>R3>R4 is satisfied.

[0017] Optionally, the liquid storage container further includes: a filter assembly and a partition;

[0018] The filter assembly is arranged at one end of the middle cylinder close to the upper end cap, and the partition is arranged in the middle of the middle cylinder; the filter assembly is connected to the middle cylinder by interference fit, and the partition is connected to the middle cylinder by interference fit.

[0019] Optionally, grooves are provided at the connection positions between the middle cylinder and the filter assembly and between the middle cylinder and the partition, and the grooves are engaged with the filter assembly and the partition to limit the displacement of the filter assembly and the partition in the axial direction of the liquid storage container.

[0020] Optionally, the liquid storage container further includes: a filter assembly and a partition;

[0021] The filter assembly is arranged at one end of the middle cylinder close to the upper end cap, and the partition is arranged in the middle of the middle cylinder; the filter assembly is connected to the middle cylinder by furnace brazing, and the partition is connected to the middle cylinder by furnace brazing.

[0022] Optionally, the liquid storage container further includes: an inlet pipe, an inner pipe, and an outlet pipe;

[0023] The inlet pipe is arranged outside the liquid storage container and is connected to the upper end cap by flame brazing;

[0024] The inner pipe is arranged inside the liquid storage container, and the outlet pipe is arranged outside the liquid storage container; both the inner pipe and the outlet pipe are connected to the lower end cap by flame brazing.

[0025] To achieve the above object, the present invention further provides a compressor, including the liquid storage container as described above.

[0026] To achieve the above object, the present invention further provides a welding method for realizing the connection of the liquid storage device as described above, including:

[0027] Clean the side walls of the upper end cap, the middle cylinder body, and the lower end cap;

[0028] Partially overlap one end of the upper end cap and the middle cylinder body with a gap therebetween to form a first overlapping section; partially overlap the other end of the lower end cap and the middle cylinder body with a gap therebetween to form a second overlapping section;

[0029] Respectively use laser welding to connect the first overlapping section and the second overlapping section, and the length of the weld formed is more than 2 mm.

[0030] In summary, in the liquid storage device, the compressor, and the welding method proposed by the present invention, the liquid storage device includes: an upper end cap, a middle cylinder body, and a lower end cap; both ends of the middle cylinder body are respectively connected to the upper end cap and the lower end cap by laser welding; there is a first overlapping section at the connection between the middle cylinder body and the upper end cap, and the upper end cap is located outside the middle cylinder body within the first overlapping section; there is a second overlapping section at the connection between the middle cylinder body and the lower end cap, and the middle cylinder body is located outside the lower end cap within the second overlapping section. Compared with the existing liquid storage devices, the present application has the following advantages:

[0031] (1) Both ends of the middle cylinder body are respectively connected to the upper end cap and the lower end cap by laser welding. Using laser welding to replace the original furnace brazing welding process reduces energy consumption and does not generate waste gas, reducing environmental pollution; at the same time, the upper end cap is located outside the middle cylinder body within the first overlapping section, and the middle cylinder body is located outside the lower end cap within the second overlapping section. The upper end cap, the middle cylinder body, and the lower end cap adopt a stepped assembly method, avoiding the accumulation of condensed water around the lower end cap and improving the service life of the liquid storage device;

[0032] (2) The filter screen assembly and the partition are respectively connected to the middle cylinder body by interference fit, and the upper end cap, the middle cylinder body, and the lower end cap are respectively connected by laser welding, eliminating the copper welding wire in the prior art and reducing the production cost;

[0033] (3) The upper end cap, the middle cylinder body, and the lower end cap are respectively connected by laser welding, and the filter screen assembly and the partition are respectively connected to the middle cylinder body by furnace brazing. The high temperature of furnace brazing can eliminate the oxide scale generated by laser welding and improve the connection strength between components. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of a liquid storage device in the prior art;

[0035] Figure 2 It is a schematic structural diagram of the liquid storage device provided by the embodiment of the present invention;

[0036] Figure 3 Schematic structural diagram of the first overlapping section or the second overlapping section provided by an embodiment of the present invention;

[0037] Figure 4 Partial schematic diagram of the liquid storage device provided by an embodiment of the present invention;

[0038] Figure 5 Schematic flow chart of the welding method provided by an embodiment of the present invention;

[0039] Among them, the descriptions of the respective reference numerals are as follows:

[0040] 10 - upper end cover; 11 - middle cylinder; 111 - protrusion; 12 - lower end cover; 13 - first overlapping section; 14 - second overlapping section; 15 - filter assembly; 16 - partition; 17 - intake pipe; 18 - inner pipe; 19 - outlet pipe; X - axial direction; Y - radial direction. Specific embodiments

[0041] To make the objectives, advantages and features of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and not drawn to scale, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention. In addition, the structures shown in the accompanying drawings are often part of the actual structures. In particular, the accompanying drawings need to show different emphases and sometimes different scales are used.

[0042] As used in this specification, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more". In addition, the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features. "One end" and "the other end", as well as "proximal end" and "distal end" generally refer to two corresponding parts, which include not only the endpoints. The terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. In addition, as used in this specification, when one component is provided on another component, it generally only indicates that there is a connection, coupling, cooperation or transmission relationship between the two components, and the two components may be directly or indirectly connected, coupled, cooperated or transmitted through an intermediate component, rather than being construed as indicating or implying the spatial position relationship between the two components, that is, one component may be inside, outside, above, below or on one side of the other component, etc. in any orientation, unless otherwise explicitly specified in the content. The terms "upper", "lower", "top", "bottom" are generally relative position relationships arranged in the direction of gravity; the terms "vertical, vertical direction" generally refer to the direction along the gravity direction, which is generally perpendicular to the ground, and the "horizontal, horizontal plane direction" is generally along the direction parallel to the ground; for those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0043] The object of the present invention is to provide a liquid reservoir, a compressor and a welding method, so as to solve the problems that the periphery of the lower end cover of the existing liquid reservoir structure is prone to liquid accumulation, the energy consumption is large when using the furnace brazing assembly method, and the waste gas generated is not easy to be treated.

[0044] Those skilled in the art can understand, please refer to Figure 1, in the existing liquid storage device, the connection between the upper end cover, the middle cylinder body and the lower end cover is usually achieved by furnace brazing. Furnace brazing generally consists of steps such as surface preparation of the workpiece, prefabrication of brazing flux and flow restrictor, assembly positioning and placement of filler metal, brazing, and removal of brazing flux and flow restrictor. Among them, brazing usually needs to be carried out under a protective atmosphere, which can prevent the workpiece from oxidizing and deoxidizing during brazing and cooling. An appropriate protective atmosphere can promote the proper wetting of the molten filler metal on the joint surface. Commonly used protective atmospheres include inert protective atmospheres (such as nitrogen or argon), reducing atmospheres (such as hydrogen). However, using hydrogen as a protective atmosphere has a risk of explosion with air, and at the same time, the gasification of metal parts and the decomposition of oxides in a high-temperature environment are likely to pollute the environment.

[0045] Based on this, please refer to Figure 2 , the present invention provides a liquid storage device, including: an upper end cover 10, a middle cylinder body 11, and a lower end cover 12; both ends of the middle cylinder body 11 are respectively connected to the upper end cover 10 and the lower end cover 12 through laser welding; a first overlapping section 13 is provided at the connection between the middle cylinder body 11 and the upper end cover 10, and the upper end cover 10 is located outside the middle cylinder body 11 within the first overlapping section 13; a second overlapping section 14 is provided at the connection between the middle cylinder body 11 and the lower end cover 12, and the middle cylinder body 11 is located outside the lower end cover 12 within the second overlapping section 14. Those skilled in the art can understand that, compared with furnace brazing, laser welding is a welding method that uses a laser beam with a high energy density as the heat source, which can effectively reduce energy consumption and avoid generating waste gas to pollute the environment. It should be noted that in this embodiment, the operator realizes the connection between the upper end cover 10 and the middle cylinder body 11 through the laser welding process in the first overlapping section 13, and realizes the connection between the middle cylinder body 11 and the lower end cover 12 through the laser welding process in the second overlapping section 14; the upper end cover 10, the middle cylinder body 11, and the lower end cover 12 are connected to form the outer contour of the liquid storage device. The liquid storage device should also include: an intake pipe 17, an inner pipe 18, an outlet pipe 19, a filter screen assembly 15, and a partition 16. The intake pipe 17 is located outside the liquid storage device and is connected to the liquid storage device through the upper end cover 10. The inner pipe 18 is located inside the liquid storage device. The outlet pipe 19 is located outside the liquid storage device, and the outlet pipe 19 is communicated with the inner pipe 18 through the lower end cover 12; the filter screen assembly 15 is located at one end of the middle cylinder body 11 close to the upper end cover 10 and is used to filter the refrigerant flowing in from the intake pipe 17. The partition 16 is located in the middle of the middle cylinder body 11 and is sleeved outside the inner pipe 18. In Figure 2In the illustrated exemplary embodiment, the outer diameter of the upper end cap 10 gradually increases from the intake pipe 17 towards the middle cylinder 11, the middle cylinder 11 is a cylindrical member with a constant diameter, and the outer diameter of the lower end cap 12 gradually decreases from the middle cylinder 11 towards the exhaust pipe 19; of course, in some other embodiments, the upper end cap 10, the middle cylinder 11, and the lower end cap 12 may also be members of other shapes, and the variation law of the outer diameters of the upper end cap 10 and the lower end cap 12 may also be a sudden change, for example, arranged in a stepped shape. Those skilled in the art can reasonably configure the upper end cap 10, the middle cylinder 11, and the lower end cap 12 according to the actual situation, and this embodiment is not limited thereto.

[0046] With such a configuration, both ends of the middle cylinder 11 are connected to the upper end cap 10 and the lower end cap 12 respectively through laser welding. Using laser welding to replace the original furnace brazing welding process reduces energy consumption and does not generate waste gas, reducing environmental pollution; at the same time, the upper end cap 10 is located outside the middle cylinder 11 within the first overlapping section 13, and the middle cylinder 11 is located outside the lower end cap 12 within the second overlapping section 14. The upper end cap 10, the middle cylinder 11, and the lower end cap 12 achieve a stepped assembly method, avoiding the accumulation of condensed water around the lower end cap 12 and extending the service life of the liquid reservoir.

[0047] Further, please refer to Figure 3 , the following relationship is satisfied among the length H1 of the first overlapping section 13 in the axial direction X of the liquid reservoir, the first penetration depth, and the first laser incident angle: H1 > L1cosα 1 , where: H1 is the length of the first overlapping section 13 in the axial direction X of the liquid reservoir; L1 is the first penetration depth; α 1 is the first laser incident angle; the following relationship is satisfied among the length H2 of the second overlapping section 14 in the axial direction X of the liquid reservoir, the second penetration depth, and the second laser incident angle: H2 > L2cosα 2 , where: H2 is the length of the first overlapping section 13 in the axial direction X of the liquid reservoir; L2 is the second penetration depth; α 2 is the second laser incident angle. Those skilled in the art can understand that the penetration depth refers to the depth of melting of the base material on the cross-section of a metal welded joint; the penetration depth of a weld is an important quality index. When the penetration depth is insufficient, incomplete penetration is likely to occur, resulting in insufficient connection strength, and when the penetration depth is too large, the base material is likely to be penetrated; technicians usually utilize the reflection and scattering characteristics of the laser to obtain the penetration depth of the weld by measuring the difference in the reflected light intensity between the surface and the bottom of the weld. Therefore, in this embodiment, L1 is the penetration depth of the weld of the first overlapping section 13, α 1 is the incident angle of the laser during welding of the first overlapping section 13, and the length H1 of the first overlapping section 13 in the axial direction X of the liquid reservoir needs to satisfy H1 > L1cosα 1, to ensure that there is no spatter during welding and the laser does not penetrate the upper end cover 10 or the side wall of the middle cylinder 11 in the first overlapping section 13, avoiding waste of materials; similarly, L2 is the weld penetration depth of the second overlapping section 14, and α 2 is the incident angle when the laser performs welding in the second overlapping section 14. The length H2 of the second overlapping section 14 in the axial direction X of the liquid storage device needs to satisfy H2 > L2cosα 2 , to ensure that there is no spatter during welding and the laser does not penetrate the middle cylinder 11 or the side wall of the lower cylinder head in the second overlapping section 14, avoiding waste of materials.

[0048] As a preferred embodiment, the maximum inner diameter of the upper end cover 10 is R1, the outer diameter of the middle cylinder 11 is R2, the inner diameter of the middle cylinder 11 is R3, and the maximum outer diameter of the lower end cover 12 is R4, then R1 > R2 > R3 > R4 is satisfied. With such a configuration, a stepped assembly method is adopted between the upper end cover 10, the middle cylinder 11, and the lower end cover 12, that is, the inner diameter of the upper end cover 10 is greater than the outer diameter of the middle cylinder 11, and the inner diameter of the middle cylinder 11 is greater than the outer diameter of the lower end cover 12, so that the condensed water can slide down along the outer wall of the liquid storage device and will not accumulate around the lower end cover 12, thereby improving the service life of the liquid storage device.

[0049] Please refer to Figure 4 , the filter screen assembly 15 is arranged at one end of the middle cylinder 11 close to the upper end cover 10, and the partition plate 16 is arranged in the middle of the middle cylinder 11; the filter screen assembly 15 is connected to the middle cylinder 11 by interference fit, and the partition plate 16 is connected to the middle cylinder 11 by interference fit. Further, grooves are provided at the connection positions between the middle cylinder 11 and the filter screen assembly 15 and between the middle cylinder 11 and the partition plate 16, and the grooves are engaged with the filter screen assembly 15 and the partition plate 16 to limit the displacement of the filter screen assembly 15 and the partition plate 16 along the axial direction X of the liquid storage device. It should be noted that in Figure 4 the illustrated exemplary example, the filter screen assembly 15 has a certain thickness along the axial direction X of the liquid storage device. Two protrusions 111 arranged along the axial direction X of the liquid storage device are provided on the side wall of the middle cylinder 11. The protrusions 111 extend inward along the radial direction Y of the liquid storage device. A groove is formed between the two protrusions 111. The length of the groove along the axial direction X of the liquid storage device is adapted to the thickness of the filter screen assembly 15, so as to realize the interference fit connection between the filter screen assembly 15 and the middle cylinder 11. Similarly, the interference fit connection between the partition plate 16 and the middle cylinder 11 is also realized by providing protrusions 111. With such a configuration, the filter screen assembly 15 and the partition plate 16 are respectively connected to the middle cylinder 11 by interference fit, and the upper end cover 10, the middle cylinder 11, and the lower end cover 12 are respectively connected by laser welding, canceling the pre-set copper welding wire in the prior art by furnace brazing, and reducing the production cost.

[0050] As an optional embodiment, the filter assembly 15 is disposed at one end of the middle cylinder 11 close to the upper end cover 10, and the partition 16 is disposed in the middle of the middle cylinder 11; the filter assembly 15 is connected to the middle cylinder 11 by furnace brazing, and the partition 16 is connected to the middle cylinder 11 by furnace brazing. With such a configuration, the upper end cover 10, the middle cylinder 11, and the lower end cover 12 are respectively connected by laser welding, and then the filter assembly 15 and the partition 16 are respectively connected to the middle cylinder 11 by furnace brazing. The high temperature of furnace brazing can eliminate the oxide scale generated by laser welding and improve the connection strength between components.

[0051] In an alternative embodiment, the intake pipe 17 is disposed outside the liquid reservoir and is connected to the upper end cover 10 by flame brazing; the inner pipe 18 is disposed inside the liquid reservoir, and the outlet pipe 19 is disposed outside the liquid reservoir; both the inner pipe 18 and the outlet pipe 19 are connected to the lower end cover 12 by flame brazing. It should be noted that flame brazing uses the flame formed by the gasification products of combustible gases or liquid fuels mixed with oxygen or air for brazing heating. It has a wider range of applications and simpler operating processes. In some other embodiments, the intake pipe 17 and the upper end cover 10, and the inner pipe 18 and the outlet pipe 19 and the lower end cover 12 can also be connected in other ways.

[0052] In another embodiment, the present invention further provides a compressor including the liquid reservoir as described above. With such a configuration, using the liquid reservoir as described above in combination with a rotary compressor, replacing the original furnace brazing welding process with laser welding reduces energy consumption and does not generate waste gas, reducing environmental pollution; at the same time, the upper end cover 10, the middle cylinder 11, and the lower end cover 12 are assembled in a stepped manner, avoiding the accumulation of condensed water around the lower end cover 12, improving the service life of the liquid reservoir, and further improving the working efficiency and stability of the compressor.

[0053] In another embodiment, please refer to Figure 5 , the present invention further provides a welding method for realizing the connection of the liquid reservoir as described above, including:

[0054] Step S1: Clean the side walls of the upper end cover 10, the middle cylinder 11, and the lower end cover 12;

[0055] Step S2: Partially overlap one end of the upper end cover 10 and the middle cylinder 11 with a gap to form a first overlapping section 13; partially overlap the other end of the lower end cover 12 and the middle cylinder 11 with a gap to form a second overlapping section 14;

[0056] Step S3: Respectively use laser welding to connect the first overlapping section 13 and the second overlapping section 14, and the length of the formed weld seam is more than 2 mm.

[0057] It should be noted that Steps S1 and S2 do not limit the execution order between the steps, that is, it is not limited to being executed in sequence, and can also be executed out of sequence. Before welding, the surfaces of the workpieces need to be cleaned, especially the parts to be welded, and it is necessary to ensure that there is no oil stain on the surfaces of the workpieces. At the same time, one end of the upper end cover 10 and the middle cylinder 11 partially overlap, and a certain gap needs to be left between them to ensure smooth air flow and prevent pores from appearing during the welding process. Similarly, one end of the lower end cover 12 and the middle cylinder 11 partially overlap, and a gap also needs to be left between them. In addition, the length of the weld formed by laser welding (that is, the length of the weld along the axial direction X of the liquid storage device) needs to be more than 2 mm to ensure the welding strength.

[0058] As an optional embodiment, the power of laser welding is above 1000 W, the width of the laser pulse is between 4.2 mm and 4.6 mm, and the time of laser welding is between 22 s and 31 s. It should be noted that the time of laser welding here refers to the time of laser welding the first overlapping section 13 or the second overlapping section 14; the laser pulse width refers to the full width at half maximum of a single pulse of Gaussian energy distribution. Those skilled in the art can understand that the operator can control parameters such as the width, energy, peak power, and repetition frequency of the laser pulse to melt the workpiece and form a specific molten pool. Those skilled in the art can select appropriate parameters for laser welding according to needs.

[0059] In summary, in the liquid storage device, compressor, and welding method provided by the embodiments of the present invention, the liquid storage device includes: an upper end cover, a middle cylinder, and a lower end cover; both ends of the middle cylinder are connected to the upper end cover and the lower end cover respectively by laser welding; there is a first overlapping section at the connection between the middle cylinder and the upper end cover, and the upper end cover is located outside the middle cylinder within the first overlapping section; there is a second overlapping section at the connection between the middle cylinder and the lower end cover, and the middle cylinder is located outside the lower end cover within the second overlapping section.

[0060] With such a configuration, both ends of the middle cylinder are connected to the upper end cover and the lower end cover respectively by laser welding. Using laser welding to replace the original furnace brazing welding process reduces energy consumption and does not generate waste gas, reducing environmental pollution. At the same time, the upper end cover is located outside the middle cylinder within the first overlapping section, and the middle cylinder is located outside the lower end cover within the second overlapping section. The upper end cover, middle cylinder, and lower end cover are assembled in a stepped manner, avoiding the accumulation of condensed water around the lower end cover and improving the service life of the liquid storage device.

[0061] Furthermore, the filter screen assembly and the partition are respectively connected to the middle cylinder by interference fit, and the upper end cover, middle cylinder, and lower end cover are respectively connected by laser welding, canceling the copper soldering in the prior art and reducing the production cost.

[0062] Further, the upper end cover, the middle cylinder body, and the lower end cover are respectively connected by laser welding, and the filter screen assembly and the partition are respectively connected to the middle cylinder body by furnace brazing. The high temperature of furnace brazing can eliminate the oxide scale generated by laser welding and improve the connection strength between components.

[0063] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure fall within the protection scope of the claims.

Claims

1. A liquid storage device, characterized in that, it comprises: an upper end cover, a middle cylinder body and a lower end cover; both ends of the middle cylinder body are connected to the upper end cover and the lower end cover respectively by laser welding; a first overlapping section is provided at the connection between the middle cylinder body and the upper end cover, and the upper end cover is located outside the middle cylinder body within the first overlapping section; a second overlapping section is provided at the connection between the middle cylinder body and the lower end cover, and the middle cylinder body is located outside the lower end cover within the second overlapping section.

2. The liquid storage device according to claim 1, characterized in that, the following relationship is satisfied among the length of the first overlapping section in the axial direction of the liquid storage device, the first penetration depth and the first laser incident angle: H1 > L1cosα 1 wherein: H1 is the length of the first overlapping segment in the axial direction of the liquid reservoir; L1 is the first penetration depth; α 1 is the first laser incident angle; the following relationship is satisfied among the length of the second overlapping section in the axial direction of the liquid storage device, the second penetration depth and the second laser incident angle: H2 > L2cosα 2 wherein: H2 is the length of the first overlapping section in the axial direction of the liquid reservoir; L2 is the second penetration depth; α 2 is the second laser incident angle.

3. The liquid storage device according to claim 1, characterized in that, the maximum inner diameter of the upper end cover is R1, the outer diameter of the middle cylinder body is R2, the inner diameter of the middle cylinder body is R3, and the maximum outer diameter of the lower end cover is R4, then R1 > R2 > R3 > R4 is satisfied.

4. The liquid storage device according to claim 1, characterized in that, the liquid storage device further comprises: a filter screen assembly and a partition; the filter screen assembly is arranged at one end of the middle cylinder body close to the upper end cover, and the partition is arranged in the middle of the middle cylinder body; the filter screen assembly is connected to the middle cylinder body by interference fit, and the partition is connected to the middle cylinder body by interference fit.

5. The liquid storage device according to claim 4, characterized in that, grooves are provided at the connection positions between the middle cylinder body and the filter screen assembly and between the middle cylinder body and the partition, and the grooves are engaged with the filter screen assembly and the partition to limit the displacement of the filter screen assembly and the partition in the axial direction of the liquid storage device.

6. The liquid storage device according to claim 1, characterized in that, the liquid storage device further comprises: a filter screen assembly and a partition; the filter screen assembly is arranged at one end of the middle cylinder body close to the upper end cover, and the partition is arranged in the middle of the middle cylinder body; the filter screen assembly is connected to the middle cylinder body by furnace brazing, and the partition is connected to the middle cylinder body by furnace brazing.

7. The liquid storage device according to claim 4 or 6, characterized in that, the liquid storage device further comprises: an inlet pipe, an inner pipe and an outlet pipe; the inlet pipe is arranged outside the liquid storage device and is connected to the upper end cover by flame brazing; the inner pipe is arranged inside the liquid storage device, and the outlet pipe is arranged outside the liquid storage device; both the inner pipe and the outlet pipe are connected to the lower end cover by flame brazing.

8. A compressor, characterized in that, it comprises the liquid storage device according to any one of claims 1 to 7.

9. A welding method for realizing the connection of the liquid storage device according to any one of claims 1 to 7, characterized in that, it comprises: cleaning the side walls of the upper end cover, the middle cylinder body and the lower end cover; partially overlapping one end of the upper end cover and the middle cylinder body with a gap therebetween to form a first overlapping section; Overlap the lower end cover and the other end portion of the middle cylinder body with a gap therebetween to form a second overlapping section; Connect the first overlapping section and the second overlapping section by laser welding respectively, and the length of the formed weld seam is more than 2 mm.

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