A connection structure between a cylinder and a liquid storage tank of a compressor

Abstract

The present invention provides a connection structure between a cylinder and a liquid reservoir of a compressor, comprising an air intake pipeline of the cylinder, an outlet pipeline of the liquid reservoir, and an air intake connecting pipe respectively connected to the air intake pipeline of the cylinder and the outlet pipeline of the liquid reservoir in a sealed manner; one end of the air intake pipeline is located in the cylinder, and the other end is located outside the cylinder, one end of the air intake connecting pipe is inserted into the air intake pipeline and is threadedly connected to the air intake pipeline, the other end of the air intake connecting pipe comprises a first sealing surface and a second sealing surface opposite to each other, the air intake connecting pipe is sealedly connected to the other end of the air intake pipeline via the first sealing surface, and the air intake connecting pipe is sealedly connected to the outlet pipeline of the liquid reservoir via the second sealing surface. The connection structure between the cylinder and the liquid reservoir of the compressor provided by the present invention has the advantages of better sealing effect, low welding heat influence, and simple assembly process.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor production and manufacturing, and in particular to a connection structure between a cylinder and a liquid accumulator of a compressor. Background Art

[0002] A compressor is a fluid machine that boosts low-pressure gas to high-pressure gas. It's the heart of the refrigeration system. A cylinder is located inside the compressor's housing. During operation, low-temperature, low-pressure refrigerant gas enters the cylinder through the intake pipe. The cylinder compresses it and then discharges high-temperature, high-pressure refrigerant gas through the exhaust pipe, powering the refrigeration cycle. This complete cycle of compression, condensation, expansion, and evaporation is achieved. Since the refrigerant can't be fully vaporized during the evaporation phase during system operation, a liquid reservoir is required between the cylinder and the evaporator to prevent liquid refrigerant from entering the cylinder from the evaporator, causing liquid hammer.

[0003] like Figure 1 As shown, the connection and sealing between the existing cylinder and the liquid reservoir requires the insertion of the intake pipe into the cylinder intake port through interference fit, and then the intake pipe 1, the shell wall pipe 2 around the cylinder intake port and the liquid reservoir pipe 3 are welded together by flame circumference. Figure 1 The fluid reservoir assembly is large and cannot be directly pressed into the cylinder for sealing. Therefore, the assembly process is more complicated, and the sealing effect of the cylinder intake port is not particularly ideal. The heat effect caused by flame welding will cause dimensional changes related to the moving parts.

[0004] Therefore, it is necessary to provide a connection structure between the compressor cylinder suction port and the liquid reservoir pipeline with better sealing effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a connection structure between a compressor cylinder and a liquid accumulator, so as to solve the problem in the prior art that the sealing process between the compressor cylinder suction port and the liquid accumulator pipeline is complicated and the sealing effect is poor.

[0006] To achieve the above-mentioned objectives, the present invention provides a connection structure between the cylinder of a compressor and a liquid reservoir, the connection structure including an intake pipe of the cylinder, an outlet pipe of the liquid reservoir, and an intake connecting pipe that is sealed and connected to the intake pipe of the cylinder and the outlet pipe of the liquid reservoir, respectively; one end of the intake pipe is located inside the cylinder, and the other end is located outside the cylinder, one end of the intake connecting pipe is inserted into the intake pipe and is threadedly connected to the intake pipe, the other end of the intake connecting pipe includes a first sealing surface and a second sealing surface relative to each other, the intake connecting pipe is sealed and connected to the other end of the intake pipe through the first sealing surface, and the intake connecting pipe is sealed and connected to the outlet pipe of the liquid reservoir through the second sealing surface.

[0007] Furthermore, the intake pipe runs through a side wall of the cylinder, and includes an intake channel located inside the cylinder and a shell wall pipe located outside the cylinder. One end of the intake connecting pipe extends into the shell wall pipe and the intake channel, and is threadedly connected to the intake channel; the other end of the intake connecting pipe is sealed with the end face of the shell wall pipe through the first sealing surface.

[0008] Furthermore, the end portion of the other end of the air intake connecting pipe extends outward along its circumference to form a connecting portion, and the two opposite surfaces of the connecting portion are the first sealing surface and the second sealing surface, respectively, wherein the first sealing surface is the surface of the connecting portion close to one end of the air intake connecting pipe.

[0009] Furthermore, the outer diameter of the other end of the air intake connecting pipe is larger than the outer diameter of the shell wall pipe.

[0010] Furthermore, the first sealing surface of the air intake connecting pipe and the end surface of the shell wall pipe are sealed by laser circumferential welding.

[0011] Furthermore, the pipe mouth of the outlet pipeline of the liquid reservoir includes a third sealing surface, and the second sealing surface of the air suction connecting pipe is sealedly connected to the third sealing surface of the outlet pipeline of the liquid reservoir.

[0012] Furthermore, the second sealing surface and the third sealing surface are sealed by laser circumferential welding.

[0013] Furthermore, the end of the air intake connecting pipe extending into the air intake channel has an external thread, and the interior of the air intake channel close to the end of the shell wall pipe is provided with a matching internal thread, and one end of the air intake connecting pipe is threadedly connected to the air intake channel.

[0014] Furthermore, the length of the threaded connection between the air intake connecting pipe and the air intake pipeline is greater than 5 mm.

[0015] Furthermore, the air intake connecting pipe is made of a material with a thermal conductivity lower than 100 W / mK.

[0016] The present invention provides a connection structure between the cylinder of a compressor and a liquid reservoir, which transforms the interference fit between the air intake port of the compressor cylinder and the air intake connecting pipe in the prior art into a threaded fit. Compared with the traditional interference fit assembly method, its sealing effect is better and the connection is more reliable.

[0017] The present invention also improves the sealing connection between the intake connecting pipe, the intake pipeline, and the reservoir outlet pipeline. A dedicated sealing surface is provided for laser circumferential welding. Compared to traditional flame welding, this significantly reduces the thermal impact of welding, preventing dimensional changes in the components during welding. Furthermore, the use of a dedicated sealing surface for welding provides a superior sealing effect. Furthermore, the number of components and sealing steps used during assembly of the connection structure is significantly reduced compared to existing technologies, reducing manufacturing costs and process requirements.

[0018] Moreover, the present invention also replaces the material of the air intake connecting pipe, replacing the copper material in the prior art with materials such as iron having a lower thermal conductivity, thereby further reducing the thermal impact caused by welding and reducing thermal deformation of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial schematic diagram of a pipe connection structure between a compressor cylinder and a liquid accumulator;

[0020] Figure 2 A schematic diagram of a connection structure between a cylinder and a liquid accumulator of a compressor provided in one embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of an air intake connecting pipe in a connecting structure between a cylinder and a liquid accumulator of a compressor provided in one embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the assembly of the suction connecting pipe and the liquid accumulator in the connection structure between the cylinder and the liquid accumulator of the compressor provided by one embodiment of the present invention.

[0023] The description of the accompanying drawings is as follows:

[0024] 1-intake pipe; 2-shell wall pipeline; 3-liquid reservoir pipeline; A-welding point;

[0025] 10-intake pipe; 20-outlet pipe; 30-intake connecting pipe; 11-intake channel; 12-shell wall pipe; 31-first sealing surface; 32-second sealing surface; 33-connecting part. DETAILED DESCRIPTION

[0026] The following describes the connection structure between the compressor cylinder and the liquid accumulator according to the present invention in more detail, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] 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 specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] Figure 2 This is a schematic diagram of the connection structure between the cylinder and the liquid accumulator of the compressor provided in one embodiment of the present invention, see Figure 2 The connection structure includes an air intake pipe 10 of the cylinder, an outlet pipe 20 of the liquid reservoir, and an air intake connecting pipe 30 that is sealed and connected to the air intake pipe 10 of the cylinder and the outlet pipe 20 of the liquid reservoir respectively; one end of the air intake pipe 10 is located inside the cylinder, and the other end is located outside the cylinder; one end of the air intake connecting pipe 30 is inserted into the air intake pipe 10 and is threadedly connected to the air intake pipe 10; the other end of the air intake connecting pipe 30 includes a first sealing surface 31 and a second sealing surface 32 opposite to each other; the air intake connecting pipe 30 is sealed and connected to the other end of the air intake pipe 10 through the first sealing surface 31, and the air intake connecting pipe 30 is sealed and connected to the outlet pipe 20 of the liquid reservoir through the second sealing surface 32. In this embodiment, the sealing connection between the air intake connecting pipe 30 and the air intake pipe 10 is set to a threaded sealing connection. Compared with the traditional interference fit method, the sealing effect is better and the connection is more reliable.

[0030] Furthermore, in a specific implementation, the intake pipe 10 generally passes through one side wall of the cylinder, and may include an intake channel 11 located inside the cylinder and a shell wall pipe 12 located outside the cylinder. One end of the intake connecting pipe 30 extends into the shell wall pipe 12 and the intake channel 11, and is threadedly connected to the intake channel 11; the other end of the intake connecting pipe 30 is sealed and connected to the end face of the shell wall pipe 12 through the first sealing surface 31. Preferably, the end of the intake connecting pipe 30 extending into the intake channel 11 has an external thread, and the interior of the intake channel 11 near the end of the shell wall pipe 12 is provided with a matching internal thread, thereby realizing a threaded connection between the intake connecting pipe 30 and the intake channel 11. Of course, the portion of the intake pipeline 10 threadedly connected to the intake connecting pipe 30 in the present invention is not limited to the portion of the intake channel 11. The intake connecting pipe 30 can also be threadedly connected to the inner wall of the shell wall pipe 12 and the inner wall of the intake channel 11 at the same time, that is, internal threads are provided on the inner wall of the shell wall pipe 12 and the inner wall of the intake channel 11 at the same time to realize a threaded connection with the intake connecting pipe 30. Preferably, in order to ensure the sealing effect of the threaded connection, the threaded connection length between the intake connecting pipe 30 and the intake pipeline 10 is greater than 5 mm.

[0031] In order to achieve a sealed connection between the suction connecting pipe 30 and the end face of the shell wall pipe 12, as shown in FIG. Figure 3 As shown, in this embodiment, the end of the other end of the air intake connecting pipe 30 is extended outward along its circumference to form a connecting portion 33, and the two opposite surfaces of the connecting portion 33 are respectively the first sealing surface 31 and the second sealing surface 32, wherein the first sealing surface 31 is the surface of the connecting portion 33 close to one end of the air intake connecting pipe 30. In order to ensure the sealing effect, a connecting portion 33 for sealing connection is specially made at the other end of the air intake connecting pipe 30, and the two surfaces of the connecting portion 33 are respectively used to seal and connect with the end face of the shell wall pipe 12 and the end face of the outlet pipe 20 of the liquid reservoir, so as to achieve a better sealing effect. More preferably, the pipe mouth of the outlet pipe 20 of the liquid reservoir can also be extended outward to form a third sealing surface, which is used to achieve a sealing connection with the second sealing surface of the air intake connecting pipe 30 to increase the sealing effect. Those skilled in the art will appreciate that, in addition to being formed in the above-mentioned manner, the connection portion 33 of the intake connecting pipe 30 may also be formed in other manners, such as welding a circular ring around the outer wall of the other end of the intake connecting pipe 30, with the two ends of the circular ring being part of the first end face and the second end face.

[0032] Preferably, the first sealing surface 31 of the air intake connecting pipe 30 is sealed to the end face of the shell wall pipe 12 by laser circumferential welding, and the second sealing surface 32 of the air intake connecting pipe 30 is sealed to the third sealing surface of the liquid reservoir outlet pipe 20 by laser circumferential welding. Compared with the flame welding method in the prior art, the present invention adopts laser circumferential welding to effectively reduce the heat impact during welding, avoid the size of each component from changing during welding, and the effect of welding and sealing by using a special sealing surface is also better. Furthermore, the wall thickness of the air intake connecting pipe 30 is greater than 1 mm, which ensures the welding effect of laser circumferential welding; in addition, during welding, in addition to laser circumferential welding, fillet welding and other methods can also be used to weld the first sealing surface 31 to the pipe wall of the shell wall pipe 12 to improve the welding sealing effect.

[0033] During assembly, the air intake connecting pipe 30 can be first sealed and connected to the air intake channel 11 by threaded connection, and the first end face can be positioned and matched with the end face of the shell wall pipe 12 to achieve the fixation of the air intake connecting pipe 30 and the cylinder. Then, laser circumferential welding is used to weld the first sealing surface of the air intake connecting pipe 30 and the end face of the shell wall pipe 12, as well as the second sealing surface of the air intake connecting pipe 30 and the third sealing surface of the outlet pipe 20 of the liquid reservoir. This significantly reduces the number of parts and sealing processes used in the connection structure compared to the prior art, thereby reducing manufacturing costs and processes. Of course, those skilled in the art can think of that, for example, Figure 4 As shown, the air intake connecting pipe 30 may be connected to the outlet pipe 20 of the liquid reservoir first, and then the air intake connecting pipe 30 may be assembled to the cylinder.

[0034] Furthermore, the outer diameter of the other end of the intake connecting pipe 30 can be made larger than the outer diameter of the shell wall pipe 12, that is, the outer diameter of the first sealing surface 31 is larger than the outer diameter of the end face of the shell wall pipe 12. In this way, when the intake connecting pipe 30 is inserted into the intake pipe 10 for assembly, the first sealing surface 31 can play a guiding and positioning role, and when the first sealing surface 31 is sealed and connected to the end face of the shell wall pipe 12, the area of ​​the sealing connection surface is increased, thereby improving the sealing effect.

[0035] Preferably, in order to further reduce the thermal impact of welding on the components of the connecting structure, unlike the traditional intake connecting pipe made of copper material, the intake connecting pipe 30 of the present invention is made of a material with a thermal conductivity coefficient lower than 100W / mK. For example, it can be made of iron, which has a thermal conductivity coefficient of 80W / mK. Iron is a readily available material with strong universality.

[0036] The connection structure between the cylinder and the liquid accumulator of the compressor of the present invention can be applied to both fully enclosed rotor compressors and other types of compressors such as scroll compressors.

[0037] In summary, the present invention provides a connection structure between the cylinder of a compressor and a liquid reservoir, and sets the sealing connection method between the suction connecting pipe and the suction pipeline to a threaded sealing connection. Compared with the traditional interference fit method, the sealing effect is better and the connection is more reliable.

[0038] The present invention also improves the sealing connection between the intake connecting pipe, the intake pipeline, and the reservoir outlet pipeline. A dedicated sealing surface is provided for laser circumferential welding. Compared to traditional flame welding, this significantly reduces the thermal impact of welding, preventing dimensional changes in the components during welding. Furthermore, the use of a dedicated sealing surface for welding provides a superior sealing effect. Furthermore, the number of components and sealing steps used during assembly of the connection structure is significantly reduced compared to existing technologies, reducing manufacturing costs and process requirements.

[0039] Moreover, the present invention also replaces the material of the air intake connecting pipe, replacing the copper material in the prior art with materials such as iron having a lower thermal conductivity, thereby further reducing the thermal impact caused by welding.

[0040] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other changes to the technical solution and technical content disclosed in the present invention shall be deemed to be within the scope of the present invention and still fall within the scope of protection of the present invention.

Claims

1. A connection structure between a cylinder of a compressor and a liquid accumulator, characterized in that: The connection structure includes an air intake pipeline of the cylinder, an outlet pipeline of the liquid reservoir, and an air intake connecting pipe which is sealed and connected to the air intake pipeline of the cylinder and the outlet pipeline of the liquid reservoir respectively; One end of the intake pipe is located in the cylinder, and the other end is located outside the cylinder. The intake pipe runs through a side wall of the cylinder, and includes an intake channel located in the cylinder and a shell wall pipe located outside the cylinder. One end of the intake connecting pipe is inserted into the intake pipe and is threadedly connected to the intake pipe. The other end of the intake connecting pipe includes a first sealing surface and a second sealing surface relative to each other. The intake connecting pipe is sealingly connected to the end surface of the shell wall pipe via the first sealing surface, and the intake connecting pipe is sealingly connected to the outlet pipe of the liquid reservoir via the second sealing surface.

2. The connection structure between the cylinder and the liquid accumulator of the compressor according to claim 1, characterized in that: The end of the other end of the air intake connecting pipe extends outward along its circumference to form a connecting portion, and the two opposite surfaces of the connecting portion are respectively the first sealing surface and the second sealing surface, wherein the first sealing surface is the surface of the connecting portion close to one end of the air intake connecting pipe.

3. The connection structure between the cylinder and the liquid accumulator of the compressor according to claim 1, characterized in that: The outer diameter of the other end of the air intake connecting pipe is greater than the outer diameter of the shell wall pipe.

4. The connection structure between the cylinder and the accumulator of the compressor according to claim 1, characterized in that: The first sealing surface of the air intake connecting pipe and the end surface of the shell wall pipe are sealed by laser circumferential welding.

5. The connection structure between the cylinder and the accumulator of the compressor according to claim 1, characterized in that: The pipe opening of the outlet pipeline of the liquid reservoir comprises a third sealing surface, and the second sealing surface of the air suction connecting pipe is sealingly connected to the third sealing surface of the outlet pipeline of the liquid reservoir.

6. The connection structure between the cylinder and the liquid accumulator of the compressor according to claim 5, characterized in that: The second sealing surface and the third sealing surface are sealed and welded by laser circumferential welding.

7. The connection structure between the cylinder and the liquid accumulator of the compressor according to claim 1, characterized in that: The length of the threaded connection between the air intake connecting pipe and the air intake pipeline is greater than 5 mm.

8. The connection structure between the cylinder and the accumulator of the compressor according to claim 1, characterized in that: The air intake connecting pipe is made of a material with a thermal conductivity lower than 100 W / mK.

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