A reservoir resistance welding process and compressor

Abstract

This invention relates to the field of compressor technology, specifically to a resistance welding process for a liquid receiver and a compressor. The resistance welding process for the liquid receiver includes an upper electrode, a lower electrode, a workpiece to be welded, and a spacer. The welding process includes the following steps: S1, workpiece positioning: positioning the cylinder and the cover; S2, electrical discharge welding: the upper electrode moves downwards from above the cover, initially falling at a speed of 0.1 m / s-1 m / s until the distance between the upper electrode and the cover is 10 cm-50 cm, at which point the falling speed of the upper electrode changes to 0.01 m / s-0.1 m / s, and the upper electrode stops moving when the cover presses firmly against the cylinder; S3, cooling: an external air blowing device blows air into the interior of the cylinder along an air blowing pipe to rapidly cool and solidify the molten area; S4, cleaning and acceptance: removing spatter and welding slag from the product. The compressor includes a liquid receiver produced using the above-described resistance welding process for the liquid receiver.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to a resistance welding process for a liquid receiver and a compressor. Background Technology

[0002] A compressor is a fluid machine that elevates low-pressure gas to high-pressure gas; it is the heart of a refrigeration system. Inside the compressor casing is a cylinder. During operation, low-temperature, low-pressure refrigerant gas enters the cylinder through the inlet pipe. After compression, the gas is discharged from the outlet pipe as high-temperature, high-pressure refrigerant gas, providing power for the refrigeration cycle and thus realizing the compression-condensation-expansion-evaporation refrigeration cycle. Because it cannot be guaranteed that the refrigerant will completely vaporize during the evaporation stage, a liquid receiver is installed between the compressor and the evaporator to prevent liquid refrigerant from entering the cylinder and causing liquid slugging. The cylinder and the liquid receiver are connected through the outlet pipe.

[0003] The receiver-of-charge (ROC) is installed on the evaporator and compressor suction pipe of an air conditioner. It is a protective component to prevent liquid refrigerant from flowing into the compressor and causing liquid slugging. Existing ROCs are welded together from a cylinder, an upper cover, a lower cover, a suction pipe, and an exhaust pipe. The concentricity between the cylinder and the upper / lower covers, the tightness of the weld between the upper cover and the suction pipe, and the tightness of the weld between the lower cover and the exhaust pipe are all important factors affecting the quality of the ROC.

[0004] Referring to invention patent publication number CN112128081A, a compressor reservoir and a compressor having the same are disclosed. The reservoir has extensions on both the upper and lower covers. These extensions are used to position the cylinder and cover, and to block spatter during welding, thereby improving the quality of the produced reservoir. However, the extensions are located on the inside of the welded edge. This design actually increases the thickness of the arc-shaped transition section, easily causing stress concentration and making the arc-shaped transition section prone to tearing and damage, thus affecting the overall service life of the reservoir.

[0005] Therefore, it is necessary to provide a technical solution to address the above problems. Summary of the Invention

[0006] This invention provides a resistance welding process for a liquid reservoir and a compressor, aiming to solve the problem that the existing design of the extension part used to block splashes in liquid reservoirs leads to an increase in the thickness of the arc transition section, which easily causes stress concentration, making the arc transition section prone to tearing and damage, thus affecting the overall service life of the liquid reservoir.

[0007] To achieve the above objectives, the present invention provides a resistance welding process for a liquid reservoir, comprising an upper electrode, a lower electrode, a workpiece to be welded, and a pad, wherein the workpiece to be welded includes a cylinder and a cover; the pad is respectively provided with an air blowing pipe and an exhaust pipe formed from the side end to the top; wherein the welding process includes the following steps:

[0008] S1. Workpiece positioning: The cylinder is placed on the lower electrode and positioned using the lower electrode; the cover is placed above the cylinder and in contact with the cylinder, with a line contact between them and a line contact width of 0.05mm-0.4mm.

[0009] S2. Discharge welding: The upper electrode moves downward from above the cover, initially falling at a speed of 0.1m / s-1m / s until the distance between the upper electrode and the cover is 10cm-50cm. At this point, the falling speed of the upper electrode changes to 0.01m / s-0.1m / s. When the cover presses tightly against the cylinder, the upper electrode stops moving.

[0010] S3. Cooling and cooling down: During the discharge process of the upper electrode and the lower electrode, the external air blowing device blows air into the inside of the cylinder along the air blowing pipe so that the hot melt part can be cooled and shaped quickly.

[0011] S4. Cleaning and Acceptance: Remove the welded product and remove spatter and welding slag by brushing and / or blowing.

[0012] More specifically, a positioning hole is provided in the middle of the upper electrode; in step S2, when the upper electrode falls, the cover body can automatically enter the interior of the positioning hole through the structure of the arc surface of the cover body itself, thereby achieving precise positioning of the cover body; the positioning gap between the cover body and the wall of the positioning hole is 0.05mm-1mm.

[0013] More specifically, the top of the pad is provided with a positioning protrusion that matches the inner cavity of the cylinder; the air outlet of the air blowing pipe is provided with multiple air outlets, which are arranged in a circumferential array on the pad, and the included angle between the axis of the air outlet and the horizontal plane is 60°-80°; the air inlet of the exhaust pipe is located at the center of the pad.

[0014] More specifically, the cover has an installation opening in the middle, and an annular flange formed by folding is provided on the outer periphery of the installation opening. Several expansion ribs are provided on the inner side of the annular flange. The cover has a welded edge formed by bending on the outer periphery. The welded edge is in contact with the cylinder. The flatness of the welded edge is 0.05mm-0.5mm, and the difference between its width and the thickness of the cylinder is 4mm-8mm.

[0015] More specifically, an annular protrusion is provided at the outer edge of the welded edge.

[0016] More specifically, an annular groove is provided on the welding edge.

[0017] More specifically, the end of the cylinder is chamfered on the inner and / or outer sides to form a sharp corner structure at the end of the cylinder, and the cover is in contact with the sharp corner structure.

[0018] More specifically, the welding edge is inclined, and the angle between it and the horizontal plane is 30°-50°.

[0019] More specifically, when the thickness of the cylinder is not greater than 1.5 mm, the width of the welded surface between the cover and the cylinder is greater than the thickness of the cylinder; when the thickness of the cylinder is greater than 1.5 mm, the width of the welded surface between the cover and the cylinder is less than the thickness of the cylinder, and greater than 65% of the thickness of the cylinder.

[0020] A compressor comprising a liquid receiver produced by the above-described resistance welding process for the liquid receiver.

[0021] The beneficial effects of this invention are as follows: This application adds a pad with an air blowing pipe and an exhaust pipe to the resistance welding processing table. When the cylinder is placed above the pad and the cover is resistance welded to the cylinder, the air blowing device continuously introduces air or other cooling gases into the interior of the cylinder. Thus, after the fusion joint of the cover and cylinder is heated and fused, it is subjected to the cooling airflow, allowing the hot-melted portion to cool and solidify rapidly, thereby significantly reducing spatter and improving the quality of the reservoir. Using the design of this application, spatter generation can be reduced from the source, eliminating the need for additional baffle structures on the cover, ensuring uniform overall thickness of the cover, preventing stress concentration, and improving the service life of the cover. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the cylinder and the cover in the welded state in this invention;

[0023] Figure 2 This is a schematic diagram of the cover body without a positioning structure in this invention;

[0024] Figure 3 This is a schematic diagram of the expansion ribs of the cover body without a positioning structure in this invention;

[0025] Figure 4 This is a schematic diagram of the first embodiment of the cover with a positioning structure in this invention;

[0026] Figure 5 This is a bottom view of the first embodiment of the cover with a positioning structure in this invention;

[0027] Figure 6 This is a schematic diagram of the second embodiment of the cover with a positioning structure in this invention;

[0028] Figure 7 This is a schematic diagram of the third embodiment of the cover with a positioning structure in this invention.

[0029] Marked in the image:

[0030] 1. Upper electrode; 11. Positioning hole; 2. Lower electrode; 3. Pad; 31. Air blowing pipe; 311. Air outlet; 32. Exhaust pipe; 33. Positioning protrusion; 4. Cylinder; 41. Chamfer; 5. Cover; 51. Mounting port; 52. Annular flange; 53. Expansion rib; 54. Welded edge; 55. Main body; 56. Arc-shaped transition section; 57. Annular protrusion; 58. Annular groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component at the same time; when a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component at the same time.

[0033] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of the embodiments of the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] To more clearly illustrate the technical solution of the present invention, a preferred embodiment is provided below for reference. Figures 1 to 7A resistance welding process for a liquid reservoir includes an upper electrode 1, a lower electrode 2, a workpiece to be welded, and a pad 3. The workpiece to be welded includes a cylinder 4 and a cover 5. The pad 3 is provided with an air blowing pipe 31 and an exhaust pipe 32 formed from the side end to the top. The welding process includes the following steps:

[0036] S1. Workpiece positioning: Place the cylinder 4 on the lower electrode 2 and use the lower electrode 2 to position the cylinder 4; place the cover 5 above the cylinder 4 and contact the cylinder 4, with the two in line contact and the line contact width being 0.05mm-0.4mm.

[0037] S2. Discharge welding: The upper electrode 1 moves downward from above the cover 5. It first falls at a speed of 0.1m / s-1m / s until the distance between the upper electrode 1 and the cover 5 is 10cm-50cm. Then the falling speed of the upper electrode 1 changes to 0.01m / s-0.1m / s. When the cover 5 presses tightly against the cylinder 4, the upper electrode 1 stops moving.

[0038] S3, Cooling and Cooling: During the discharge process of the upper electrode 1 and the lower electrode 2, the external air blowing device blows air into the inside of the cylinder 4 along the air blowing pipe 31 so that the hot melt part can be cooled and shaped quickly.

[0039] S4. Cleaning and Acceptance: Remove the welded product and remove spatter and welding slag by brushing and / or blowing.

[0040] The resistance welding process for a liquid reservoir disclosed in this invention differs from existing processes in that a pad 3 with an air blowing pipe 31 and an exhaust pipe 32 is added to the resistance welding table. When the cylinder 4 is placed above the pad 3 and the cover 5 is resistance welded to the cylinder 4, the air blowing device continuously introduces air or other cooling gases into the interior of the cylinder 4. Thus, after the fusion of the cover 5 and the cylinder 4, the fused portion is rapidly cooled and solidified by the cooling airflow, significantly reducing spatter and improving the quality of the liquid reservoir. Using this design, spatter generation can be reduced from the source, eliminating the need for additional baffle structures on the cover 5, ensuring uniform overall thickness of the cover 5, preventing stress concentration, and extending the service life of the cover 5.

[0041] Furthermore, this application appropriately adjusts the falling speed of the upper electrode 1 to improve welding quality. It should be understood that in conventional welding processes, the upper electrode 1 descends at a uniform speed of only 0.1 m / s to 1 m / s until it contacts the cover 5. This design causes the cover 5 to flatten the end of the cylinder 4 due to the pressure applied by the upper electrode 1 when it presses down on the cover 5, thus increasing the contact area between the cover 5 and the cylinder 4. The size of this altered contact area is uncontrollable. According to the heat generation calculation formula Q = I²(R1 + R2)t (where I is the welding current, R1 and R2 are the resistance values ​​of the cylinder 4 and cover 5 respectively, and t is the welding time), and the resistance calculation formula... (Where ρ is the material resistivity, L is the discharge distance, which is related to the surface roughness, and S is the contact area) It can be seen that the material resistivity and discharge distance are fixed values. When the contact area is larger, the resistance of the cylinder 4 and the cover 5 is smaller. When the welding current and welding time are set in advance, the smaller the resistance of the cylinder 4 and the cover 5, the less heat is generated. It can be seen that because the existing welding process will cause the contact area between the cover 5 and the cylinder 4 to increase during the falling of the lower electrode 2, it is very easy for the welding heat generation to be insufficient and the cover 5 and the cylinder 4 to not be fully welded. In this application, when the distance between the upper electrode 1 and the cover 5 is 10cm-50cm, the falling speed of the upper electrode 1 is changed so that the upper electrode 1 contacts the cover 5 slowly. This ensures that the contact surface between the cover 5 and the cylinder 4 does not change significantly, and keeps the line contact width between the cover 5 and the cylinder 4 below 0.4mm. In this way, the falling process of the upper electrode 1 is not too long, and the welding heat generation reaches the standard within a specific time, so that the cover 5 and the cylinder 4 can be completely welded, thus improving the yield.

[0042] In this embodiment, a positioning hole 11 is provided in the middle of the upper electrode 1. In step S2, when the upper electrode 1 falls, the cover 5 can automatically enter the interior of the positioning hole 11 through the structure of its own arc surface, thereby achieving precise positioning of the cover 5. The positioning gap between the cover 5 and the wall of the positioning hole 11 is 0.05mm-1mm. It should be understood that this application has eliminated the stop structure, which makes it impossible to directly and accurately position the cover 5 and the cylinder 4. Therefore, this application adds a positioning hole 11 to the upper electrode 1 to position the cover 5, so that the concentricity between the cover 5 and the cylinder 4 is high, thereby improving the quality of the welded liquid reservoir.

[0043] Furthermore, the lower electrode 2 is a circumferential electrode, and the cylinder 4 is placed in the middle of the circumferential electrode, thereby achieving the positioning of the cylinder 4.

[0044] In this embodiment, the top of the pad 3 is provided with a positioning protrusion 33 that matches the inner cavity of the cylinder 4; the air outlet 311 of the air blowing pipe 31 is provided with multiple air outlets 311, which are arranged in a circumferential array on the pad 3, and the included angle α formed between the axis of the air outlet 311 and the horizontal plane is 60°-80°; the air inlet of the exhaust pipe 32 is located at the center of the pad 3. (See reference...) Figure 1 The gas output from the vent 311 flows upwards at an angle until it hits the connection between the cover 5 and the cylinder 4, allowing the cooling airflow to efficiently exchange heat from the molten part, achieving the best cooling effect. Several streams of cooling airflow converge in the middle of the cylinder 4, and through mutual interference, the cooling airflow ultimately flows downwards and is discharged outwards along the exhaust pipe 32. This design allows the cooling airflow input into the cylinder 4 by the air blowing device to form an orderly flow path, thereby significantly improving cooling efficiency.

[0045] Furthermore, the air pressure of the gas blown out by the air blowing device is 0.2MPa-0.6MPa. It should be understood that when the air pressure is too high, the gas can easily blow the cover 5 into displacement, while when the air pressure is too low, the cooling effect will be poor.

[0046] In this embodiment, step S5 involves extending an air needle to the weld between the cover 5 and the cylinder 4, and using the air needle to blow air onto the weld between the cover 5 and the cylinder 4 to remove spatter and welding slag from the welded product. The air pressure of the gas blown out by the air needle is 0.3 MPa to 0.8 MPa.

[0047] In this embodiment, the cover 5 has an installation opening 51 in the middle, and an annular flange 52 formed by folding is provided on the outer periphery of the installation opening 51. The inner side of the annular flange 52 is provided with several expansion ribs 53. Specifically, by setting several expansion ribs 53, when the steel pipe is placed in the installation opening 51, the steel pipe and the expansion ribs 53 are closely attached, and the two are in an interference fit. This makes the welding position between the steel pipe and the cover 5 relatively stable when they are welded, improving the concentricity of the two after welding. Moreover, due to the support of the expansion ribs 53, the gap between the steel pipe and the annular flange 52 is larger, so that the welding material can better penetrate into the gap between the steel pipe and the annular flange 52, thereby improving the welding quality and increasing the yield of the liquid reservoir.

[0048] Preferably, there are 3-8 expansion ribs 53, and the expansion ribs 53 are arranged in a circumferential array within the annular flange 52. It should be understood that when the number of expansion ribs 53 is within the above range, it can ensure the stable fit between the steel pipe and the cover body 5, and also ensure that there is a sufficient gap between the steel pipe and the cover body 5 for the underflow of welding material.

[0049] In this embodiment, the outer periphery of the cover 5 is provided with a bent welding edge 54, which is in contact with the cylinder 4. The flatness of the welding edge 54 is 0.05mm-0.5mm, and the difference between its width and the thickness of the cylinder 4 is 4mm-8mm. It should be understood that when the flatness of the welding edge 54 is too large, that is, when the surface of the welding surface is too rough, severe spatter will occur during the welding process, resulting in poor quality of the welded product.

[0050] In this embodiment, the inner side of the welding edge 54 is the main body part 55 of the cover 5. An arc-shaped transition section 56 is provided between the main body part 55 and the welding edge 54. The difference between each pair of the thickness of the main body part 55, the thickness of the arc-shaped transition section 56 and the thickness of the welding edge 54 does not exceed 0.5mm; the radius of the arc-shaped transition section 56 is 0.5mm-3.5mm.

[0051] In this embodiment, a positioning structure is provided on the welding edge 54. The positioning structure can be specifically designed as follows:

[0052] In the first design, an annular protrusion 57 is provided at the outer edge of the welded edge 54, with a width of 0.5mm-3mm. It should be understood that the annular protrusion 57 can be a circular ring-shaped protrusion or a ring-shaped structure composed of several protrusions arranged circumferentially. Specifically, when the cylinder 4 and the cover 5 are fitted together, the cylinder 4 is placed inside the annular protrusion 57 to position the cylinder 4 and ensure a high degree of concentricity between the cylinder 4 and the cover 5. Unlike the liquid reservoir disclosed in invention patent CN112128081A, this design makes a reasonable improvement to the positioning structure, placing it at the outer edge of the welded edge 54. This ensures that the positioning structure does not affect the structure of the arc-shaped transition section 56, thereby avoiding stress concentration, ensuring the structural stability of the arc-shaped transition section 56, and improving the overall quality of the liquid reservoir.

[0053] The second embodiment features an annular groove 58 on the welded edge 54, with a depth of 0.2mm-1mm. It should be understood that the cross-section of the annular groove 58 can be semi-circular, rectangular, triangular, or other structures. Specifically, when the cylinder 4 and the cover 5 are fitted together, the cylinder 4 is placed within the annular groove 58 to position it, ensuring a high degree of concentricity between the cylinder 4 and the cover 5. Unlike the liquid reservoir disclosed in patent application CN112128081A, this embodiment makes a reasonable improvement to the positioning structure, placing it in the middle of the welded edge 54. This ensures that the positioning structure does not affect the structure of the arc-shaped transition section 56, thereby avoiding stress concentration, ensuring the structural stability of the arc-shaped transition section 56, and improving the overall quality of the liquid reservoir.

[0054] In either the first or second design, the end of the cylinder 4 is chamfered 41 on the inner and / or outer sides to form a sharp corner structure, with the cover 5 in contact with the sharp corner structure. This design reduces the contact area between the cover 5 and the cylinder 4, allowing the line contact width between them to be within the range of 0.05mm-0.4mm.

[0055] The third embodiment features an inclined welding edge 54, forming an angle b of 30°-50° with the horizontal plane. Specifically, by tilting the welding edge 54, it creates a self-positioning structure. This allows the welding edge 54 to position the cylinder 4 when it mates with the cover 5, preventing relative horizontal displacement between them and ensuring their concentricity. Unlike the liquid reservoir disclosed in patent CN112128081A, this embodiment directly uses the welding edge 54 as the positioning structure, eliminating the need for a stop structure at the arc-shaped transition section 56. This avoids stress concentration, ensures the structural stability of the arc-shaped transition section 56, and improves the overall quality of the liquid reservoir. It should be understood that in the third embodiment, the welding edge 54 directly contacts the outer corner of the cylinder 4, thus eliminating the need for a chamfer 41.

[0056] In this embodiment, when the thickness of the cylinder 4 is no greater than 1.5 mm, the width of the weld surface between the cover 5 and the cylinder 4 is greater than the thickness of the cylinder 4. When the thickness of the cylinder 4 is greater than 1.5 mm, the width of the weld surface between the cover 5 and the cylinder 4 is less than the thickness of the cylinder 4, but greater than 65% of the thickness of the cylinder 4. This design ensures a stable weld between the cover 5 and the cylinder 4.

[0057] A compressor comprising a liquid receiver produced by the above-described resistance welding process for the liquid receiver.

[0058] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A resistance welding process for a liquid reservoir, comprising an upper electrode, a lower electrode, a workpiece to be welded, and a pad, characterized in that: The workpiece to be welded includes a cylinder and a cover; the pad is respectively provided with an air blowing pipe and an exhaust pipe formed from the side end to the top; wherein, the welding process includes the following steps: S1. Workpiece positioning: The cylinder is placed on the lower electrode and positioned using the lower electrode; the cover is placed above the cylinder and in contact with the cylinder, with a line contact between them and a line contact width of 0.05mm-0.4mm. S2. Discharge welding: The upper electrode moves downward from above the cover, initially falling at a speed of 0.1m / s-1m / s until the distance between the upper electrode and the cover is 10cm-50cm. At this point, the falling speed of the upper electrode changes to 0.01m / s-0.1m / s. When the cover presses tightly against the cylinder, the upper electrode stops moving. S3. Cooling and cooling down: During the discharge process of the upper electrode and the lower electrode, the external air blowing device blows air into the inside of the cylinder along the air blowing pipe so that the hot melt part can be cooled and shaped quickly. S4. Cleaning and Acceptance: Remove the welded product and remove spatter and welding slag by brushing and / or blowing. The top of the pad is provided with a positioning protrusion that matches the inner cavity of the cylinder; the air outlet of the air blowing pipe is provided with multiple air outlets, which are arranged in a circumferential array on the pad, and the included angle between the axis of the air outlet and the horizontal plane is 60°-80°; the air inlet of the exhaust pipe is located at the center of the pad. When the thickness of the cylinder is not greater than 1.5 mm, the width of the welded surface between the cover and the cylinder is greater than the thickness of the cylinder. When the thickness of the cylinder is greater than 1.5 mm, the width of the welded surface between the cover and the cylinder is less than the thickness of the cylinder, but greater than 65% of the thickness of the cylinder.

2. The resistance welding process for a liquid reservoir according to claim 1, characterized in that: The upper electrode has a positioning hole in the middle; in step S2, when the upper electrode falls, the cover body can automatically enter the interior of the positioning hole through the structure of the arc surface of the cover body itself, thereby achieving precise positioning of the cover body; the positioning gap between the cover body and the wall of the positioning hole is 0.05mm-1mm.

3. The resistance welding process for a liquid reservoir according to claim 1, characterized in that: The cover has an installation opening in the middle, and an annular flange formed by folding is provided on the outer periphery of the installation opening. Several expansion ribs are provided on the inner side of the annular flange. The cover has a welded edge formed by bending on the outer periphery. The welded edge is in contact with the cylinder. The flatness of the welded edge is 0.05mm-0.5mm, and the difference between its width and the thickness of the cylinder is 4mm-8mm.

4. The resistance welding process for a liquid reservoir according to claim 3, characterized in that: The outer edge of the welded edge is provided with an annular protrusion.

5. The resistance welding process for a liquid reservoir according to claim 3, characterized in that: An annular groove is provided on the welded edge.

6. The resistance welding process for a liquid reservoir according to any one of claims 4-5, characterized in that: The end of the cylinder is chamfered on the inner and / or outer sides to form a sharp corner structure, and the cover is in contact with the sharp corner structure.

7. The resistance welding process for a liquid reservoir according to claim 3, characterized in that: The welded edge is inclined, and the angle between it and the horizontal plane is 30°-50°.

8. A compressor, characterized in that: This includes liquid reservoirs produced by the resistance welding process described in any one of claims 1-7.

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