Connecting pipe, liquid accumulator and compressor

Abstract

The utility model relates to the technical field of refrigeration equipment, in particular to a connecting pipe, a liquid accumulator and a compressor. The connecting pipe comprises a base, a copper pipe and an iron pipe, the base is annular, and an annular step formed by protruding outwards is arranged on the periphery of the base; the iron pipe is arranged in an inner hole of the base and is fixedly connected with the base; the copper pipe and the iron pipe are located on the same axis, and the copper pipe is fixedly connected with the base or the iron pipe. The liquid storage device comprises the connecting pipe. The compressor comprises the liquid storage device. The connecting pipe solves the problem that an existing connecting pipe is high in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a connecting pipe, a liquid storage device and a compressor. Background Art

[0002] The compressor is a fluid machine that can elevate low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. A cylinder is set inside the shell of the compressor. When working, low-temperature and low-pressure refrigerant gas enters the cylinder from the intake pipe. After the cylinder compresses it, high-temperature and high-pressure refrigerant gas is discharged from the exhaust pipe to provide power for the refrigeration cycle, thereby realizing the compression-condensation-expansion-evaporation refrigeration cycle. Since it is impossible to guarantee that the refrigerant can be completely vaporized during the evaporation stage during the operation of the system, in order to prevent the refrigerant from coming out of the evaporator from entering the cylinder in liquid state and causing liquid hammer, a liquid reservoir needs to be set between the compressor and the evaporator, and the cylinder and the liquid reservoir are connected through the exhaust pipe.

[0003] The connecting pipe (intake pipe or exhaust pipe) is an important component of the liquid reservoir. In order to ensure the stable connection between the liquid reservoir and other components, the connecting end of the connecting pipe needs to be made of copper material to ensure welding stability. Most of the existing connecting pipes are one-piece copper tube structures, one end of which is welded to the liquid reservoir to achieve the air intake effect, and the other end extends outside the liquid reservoir for welding with other components. This structure is also reflected in the utility model patent with publication number CN203893516U. Although the above-mentioned copper connecting pipe ensures stable welding between the liquid reservoir and other components, the cost of copper material is relatively high, resulting in high production costs for mass production of liquid reservoirs. Utility Model Content

[0004] The utility model aims to solve the problem that in order to ensure stable connection with other components, the connecting pipe of the existing liquid reservoir needs to be made of copper pipe, which leads to high mass production cost of the liquid reservoir.

[0005] To achieve the above object, the utility model provides a connecting pipe, including a base, a copper pipe and an iron pipe, wherein:

[0006] The base is annular, and its outer circumference is provided with an annular step protruding outward; the iron pipe is arranged in the inner hole of the base and is fixedly connected to the base; the copper pipe and the iron pipe are located on the same axis and are fixedly connected to the base or the iron pipe.

[0007] More specifically, a positioning structure for preliminarily fixing the iron pipe and / or the copper pipe is provided on the inner side wall of the base; the iron pipe is fixed to the base by welding, and the copper pipe is fixed to the base or the iron pipe by welding.

[0008] More specifically, the positioning structure includes a plurality of positioning ribs, and the plurality of positioning ribs are arranged on the inner side wall of the base along a circumferential direction; the copper tube and / or the iron tube are in close contact with the positioning ribs.

[0009] More specifically, an abutting structure is provided at the end of the iron pipe, and the abutting structure abuts against the top of the positioning structure; the copper pipe abuts against the abutting structure and is welded and fixed to the base.

[0010] More specifically, the end of the iron pipe is provided with an expansion section formed by expanding outward, the expansion section is arranged on the inner hole of the base and abuts against the top of the positioning rib; the copper pipe is inserted into the expansion section, and the copper pipe and the iron pipe are both welded and fixed to the base.

[0011] More specifically, the positioning structure is an annular positioning step arranged on the inner side wall of the base or a plurality of positioning ribs arranged on the inner side wall of the base along the circumferential direction.

[0012] More specifically, a hole expansion section is provided at the end of the iron pipe, and the hole expansion section is located outside the base. The copper pipe is inserted into the hole expansion section and is welded and fixed to the iron pipe.

[0013] More specifically, the iron pipe and the base are integrally formed, the copper pipe is inserted into the inner hole of the base and rests against the top of the iron pipe, and is fixed to the base by welding.

[0014] A liquid storage device comprises the above-mentioned connecting tube.

[0015] A compressor comprises the above-mentioned liquid accumulator.

[0016] The technical effect of the utility model is as follows: the main structure of the connecting pipe of the present application is made of a relatively low-cost iron pipe, while the end portion retains a copper pipe structure. In this way, while ensuring the stability of the connecting pipe in use, the production cost is reduced. The copper pipe is used to connect with other components, and can also ensure the stability of the connection between the liquid reservoir having the connecting pipe and other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a first embodiment of a connecting pipe involved in the utility model;

[0018] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0019] Figure 3 This is a structural schematic diagram of another implementation scheme of the first embodiment of the connecting pipe involved in the utility model;

[0020] Figure 4 This is a structural schematic diagram of a second embodiment of a connecting pipe involved in the utility model;

[0021] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0022] Figure 6 This is a structural schematic diagram of a third embodiment of a connecting pipe involved in the utility model;

[0023] Figure 7 for Figure 6 The enlarged schematic diagram of the center C;

[0024] Figure 8 This is a structural schematic diagram of a fourth embodiment of a connecting pipe involved in the utility model;

[0025] Fig. 9 for Figure 8 The enlarged schematic diagram of point D in the middle;

[0026] Fig.10 This is a structural schematic diagram of a fifth embodiment of a connecting pipe involved in the utility model;

[0027] Fig.11 for Fig.10 Enlarged schematic diagram of point E in the middle.

[0028] Markings in the figure:

[0029] 1. Base; 2. Copper tube; 3. Iron tube; 4. Annular step; 5. Positioning structure; 6. Annular filling groove; 7. Positioning surface; 8. Guide chamfer; 9. Hole expansion section; 10. Abutment structure; 11. Welding spring; 12. Expansion section. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element at the same time; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] Embodiment 1

[0035] See also Figure 1 to Figure 3 , a connecting pipe, comprising a base 1, a copper pipe 2 and an iron pipe 3, wherein:

[0036] The base 1 is annular, and an annular step 4 protruding outward is provided on its outer periphery; the iron pipe 3 is arranged in the inner hole of the base 1 and is fixedly connected to the base 1; the copper pipe 2 and the iron pipe 3 are located on the same axis and are fixedly connected to the base 1.

[0037] Compared with the prior art, the difference lies in that the main structure of the connecting pipe of the present application is made of a low-cost iron pipe 3, while the end retains the copper pipe 2 structure. In this way, while ensuring the stability of the connecting pipe, the production cost is reduced. Among them, the copper pipe 2 is used to connect with other components, and can also ensure the stability of the connection between the liquid reservoir having the connecting pipe and other components.

[0038] In this embodiment, the diameter of the iron tube 3 is the same as that of the copper tube 2, and both the copper tube 2 and the iron tube 3 are interference fit with the base 1. Solder is filled between the copper tube 2 and the base 1 and between the iron tube 3 and the base 1. The copper tube 2 and the base 1 are welded and fixed by hot-melt solder, and the iron tube 3 and the base 1 are welded and fixed by hot-melt solder. When the copper tube 2 and the iron tube 3 are welded to the base 1, the copper tube 2 and the iron tube 3 are first inserted and fixed to the inner hole of the base 1, and then the solder is inserted into the gap between the copper tube 2 and the base 1 and the gap between the iron tube 3 and the base 1, and the solder is melted by furnace welding, flame brazing, high-frequency welding, etc., so that the molten solder penetrates into the above-mentioned gap. When the solder is cooled, the copper tube 2 and the iron tube 3 are tightly connected to the base 1, and the connection between the copper tube 2 and the iron tube 3 has excellent airtightness to avoid the leakage of refrigerant. Preferably, the solder can be brass solder, copper solder or other medium-temperature solder.

[0039] When the connecting tube involved in the utility model is welded to the end cover of the liquid reservoir, the end of the base 1 passes through the end cover, and the annular step 4 abuts against the end cover. Solder is filled between the base 1 and the end cover. The solder is heated and melted by any welding method such as furnace welding, argon arc welding, circular welding, flame brazing, high-frequency welding, etc., so that the liquid solder penetrates between the base 1 and the end cover. After the solder is cooled and solidified, the end cover is tightly connected to the connecting tube.

[0040] As a preferred solution of this embodiment, a positioning structure 5 is provided on the base 1, and the positioning structure 5 includes a plurality of positioning ribs distributed on the inner side wall of the base 1 along the circumferential direction, and the iron tube 3 and the copper tube 2 are in close contact with the positioning ribs. It should be understood that, by setting the positioning ribs, the iron tube 3 and the copper tube 2 can be made to have an interference fit with the base 1, and sufficient gaps can be left between the iron tube 3 and the copper tube 2 and the base 1, so that it can be ensured that the iron tube 3, the copper tube 2 and the base 1 are relatively fixed during welding, improving the welding stability, and ensuring that the solder fully penetrates, thereby improving the quality of the welded connecting pipe.

[0041] Furthermore, the positioning expansion ribs can be divided into a plurality of upper expansion ribs and a plurality of lower expansion ribs, wherein the copper tube 2 is in close contact with the upper expansion ribs, and the iron tube 3 is in close contact with the lower expansion ribs.

[0042] As another preferred solution, the positioning structure 5 may also include a plurality of positioning protrusions arranged along the circumferential direction on the inner side wall of the base 1 .

[0043] As a preferred solution of this embodiment, an annular filling groove 6 is provided at the top and / or bottom of the base 1, and the annular filling groove 6 is connected to the inner hole of the base 1. The annular filling groove 6 is used to fill the solder. Specifically, it is difficult to directly fill the solder into the gap between the copper tube 2 and the base 1 and the gap between the iron tube 3 and the base 1. Therefore, before the iron tube 3 and the copper tube 2 are welded to the base 1, the solder can be placed in the annular filling groove 6. When the solder is melted, the liquid solder penetrates along the above-mentioned gap to weld the iron tube 3 and the copper tube 2 to the base 1 respectively.

[0044] Furthermore, the bottom wall of the annular filling groove 6 is inclined. The above design not only facilitates the solder to penetrate, but also allows the bottom wall of the annular filling groove 6 to play a guiding role, making it easier for the iron pipe 3 and the copper pipe 2 to be inserted into the base 1.

[0045] As a preferred solution of this embodiment, an end of the annular step 4 close to the copper tube 2 is provided with an inclined positioning surface 7. Preferably, the angle between the positioning surface 7 and the horizontal plane is 15°-75°. It should be noted that an annular inclined surface matching the positioning surface 7 is provided on the end cover of the liquid reservoir. When the connecting pipe involved in the present application is welded to the end cover, the positioning surface 7 cooperates with the annular inclined surface to enable the connecting pipe and the end cover to be stably docked, so that the subsequent welding is stable, thereby improving the overall quality of the prepared liquid reservoir.

[0046] Furthermore, a guide chamfer 8 is provided on the outer side of the top of the base 1. It should be understood that when the connecting pipe is welded to the end cover, the top of the base 1 will pass through the through hole in the middle of the end cover, and the design of the guide chamfer 8 can guide the base 1, ensuring that the base 1 passes through the through hole smoothly to avoid scratching the end cover, and this design can also avoid stress concentration on the base 1 and reduce the risk of damage to the base 1.

[0047] A liquid storage device comprises the above-mentioned connecting pipe.

[0048] A compressor comprises the above-mentioned liquid accumulator.

[0049] Embodiment 2

[0050] See also Figure 4-5 , a connecting pipe, comprising a base 1, a copper pipe 2 and an iron pipe 3, wherein:

[0051] The base 1 is annular, and its outer periphery is provided with an annular step 4 protruding outward; the iron pipe 3 is arranged in the inner hole of the base 1 and is fixedly connected to the base 1; the copper pipe 2 and the iron pipe 3 are located on the same axis and are fixedly welded to the iron pipe 3.

[0052] Furthermore, the end of the iron pipe 3 is provided with a flared section 9, which is located outside the base 1, and the copper pipe 2 is inserted into the flared section 9, which is filled with solder, and the copper pipe 2 and the iron pipe 3 are welded and fixed by hot-melt solder.

[0053] Compared with the first embodiment, the difference is that in the present application, the copper tube 2 is directly welded to the iron tube 3. By adopting this design, the length of the iron tube 3 can be extended and the required length of the copper tube 2 can be shortened, that is, the specific gravity of the copper tube 2 and the iron tube 3 can be reduced, and the production cost can be further reduced. In addition, the copper tube 2 is directly connected to the iron tube 3, which can improve the concentricity of the two, thereby improving the quality of the prepared connecting tube.

[0054] It should be understood that in this embodiment, the base 1 is also provided with a positioning structure 5, an annular filling groove 6, a positioning surface 7, a guide chamfer 8 and other structures, and the arrangement method thereof is the same as that of the first embodiment, so it will not be repeated here.

[0055] A liquid storage device comprises the above-mentioned connecting pipe.

[0056] A compressor comprises the above-mentioned liquid accumulator.

[0057] Embodiment 3

[0058] See also Figure 6-7 , a connecting pipe, comprising a base 1, a copper pipe 2 and an iron pipe 3, wherein:

[0059] The base 1 is annular, and its outer periphery is provided with an annular step 4 protruding outward; the iron pipe 3 is arranged in the inner hole of the base 1 and is fixedly connected to the base 1; the copper pipe 2 and the iron pipe 3 are located on the same axis and are welded and fixed to the base 1.

[0060] Furthermore, a positioning structure 5 is provided on the base 1, and the positioning structure 5 includes a plurality of positioning ribs provided on the inner side wall of the base 1 along the circumferential direction; an abutting structure 10 is provided at the end of the iron tube 3, and the iron tube is in close contact with the positioning ribs, and the abutting structure 10 abuts against the positioning ribs, and the copper tube 2 is provided in the inner hole of the base 1 and abuts against the abutting structure 10; the copper tube 2 and the iron tube 3 are both welded and fixed to the base 1. It should be understood that the abutting structure 10 is a structure such as a bell mouth, a step body, etc. that can make the iron tube 3 abut against the positioning structure 5; and the top surface of the positioning structure 5 is matched with the bottom surface of the abutting structure 10, that is, when the bottom surface of the abutting structure 10 is a plane, the top surface of the positioning structure 5 is a plane, and when the bottom surface of the abutting structure 10 is an inclined surface, the top surface of the positioning structure 5 is a matching inclined surface.

[0061] As another preferred solution, the positioning structure 5 includes an annular positioning step provided on the inner side wall of the base 1, and the abutment structure 10 abuts against the top of the annular positioning step to fix the position of the iron pipe 3. Preferably, a positioning rib may be provided on the inner side wall of the annular positioning step.

[0062] Compared with the first embodiment, the difference lies in that, in the present application, an abutment structure 10 is added to the iron pipe 3 to limit the position of the iron pipe 3. With this design, after the iron pipe 3 is inserted into the base 1, when the abutment structure 10 conflicts with the positioning structure 5, the iron pipe 3 cannot continue to move downward. That is, through the cooperation of the abutment structure 10 and the positioning structure 5, the iron pipe 3 can be quickly set to an appropriate position, and there is no need to manually adjust the relative position of the iron pipe 3 and the base 1. In this way, the preparation efficiency of the connecting pipe can be greatly improved.

[0063] Furthermore, an annular welding spring 11 is provided between the iron tube 3 and the copper tube 2. With the above design, during welding, the welding spring 11 can be melted to fully fill the gap between the iron tube 3 and the copper tube 2, so that the copper tube 2 and the abutment structure 10 are welded tightly, thereby avoiding leakage.

[0064] It should be understood that in this embodiment, the base 1 is also provided with an annular filling groove 6, a positioning surface 7, a guide chamfer 8 and other structures, and the arrangement method thereof is the same as that of the first embodiment, so it will not be described in detail here.

[0065] A liquid storage device comprises the above-mentioned connecting pipe.

[0066] A compressor comprises the above-mentioned liquid accumulator.

[0067] Embodiment 4

[0068] See also Figure 8-Figure 9 , a connecting pipe, comprising a base 1, a copper pipe 2 and an iron pipe 3, wherein:

[0069] The base 1 is annular, and its outer periphery is provided with an annular step 4 protruding outward; the iron pipe 3 is arranged in the inner hole of the base 1 and is fixedly connected to the base 1; the copper pipe 2 and the iron pipe 3 are located on the same axis and are fixedly welded to the iron pipe 3.

[0070] Furthermore, the end of the iron pipe 3 is provided with an expansion section 12 formed by expanding outward, and the base 1 is provided with a positioning structure 5, which includes a plurality of positioning ribs arranged on the inner side wall of the base 1 along the circumferential direction, and the expansion section 12 is arranged on the inner hole of the base 1 and abuts against the top of the positioning ribs, and the iron pipe 3 is in close contact with the positioning ribs; the copper pipe 2 is inserted into the expansion section 12; the iron pipe 3 is fixed to the base 1 by welding, and the copper pipe 2 is fixed to the iron pipe 3 by welding. It should be understood that the top surface of the positioning structure 5 is matched with the bottom surface of the expansion section 12, that is, when the bottom surface of the expansion section 12 is a plane, the top surface of the positioning structure 5 is a plane, and when the bottom surface of the expansion section 12 is an inclined surface, the top surface of the positioning structure 5 is a matching inclined surface.

[0071] As another preferred solution, the positioning structure 5 includes an annular positioning step provided on the inner side wall of the base 1, and the expansion section 12 abuts against the top of the annular positioning step to fix the position of the iron pipe 3. Preferably, positioning ribs may be provided on the inner side wall of the annular positioning step.

[0072] Compared with the first embodiment, the difference lies in that the present application adds an expansion section 12 to the iron pipe 3, and the expansion section 12 is located in the base 1, and the end of the copper pipe 2 is inserted in the expansion section 12. With this design, not only can the iron pipe 3 be quickly positioned by utilizing the cooperation between the expansion section 12 and the positioning structure 5 to improve the preparation efficiency of the connecting pipe, but also because the copper pipe 2 is directly connected to the iron pipe 3, the concentricity of the two is higher, and the connection between the copper pipe 2 and the iron pipe 3 corresponds to the position of the base 1, so that the connection between the copper pipe 2 and the iron pipe 3 is more stable. In this way, the quality of the finally prepared connecting pipe can be greatly improved.

[0073] It should be understood that in this embodiment, the base 1 may be provided with structures such as an annular filling groove 6, a positioning surface 7, and a guide chamfer 8, and the arrangement method thereof is the same as that of the first embodiment, so it will not be described in detail here.

[0074] A liquid storage device comprises the above-mentioned connecting pipe.

[0075] A compressor comprises the above-mentioned liquid accumulator.

[0076] Embodiment 5

[0077] See also Figure 10-11 , a connecting pipe, comprising a base 1, a copper pipe 2 and an iron pipe 3, wherein:

[0078] The base 1 is annular, and its outer periphery is provided with an annular step 4 protruding outward; the iron pipe 3 is arranged in the inner hole of the base 1 and is fixedly connected to the base 1; the copper pipe 2 and the iron pipe 3 are located on the same axis and are welded and fixed to the base 1.

[0079] Furthermore, the iron tube 3 and the base 1 are integrally formed, the copper tube 2 is inserted into the inner hole of the base 1 and rests against the top of the iron tube 3 , and is fixed to the base 1 by welding.

[0080] Compared with the first embodiment, the difference lies in that the present application integrally forms the iron pipe 3 and the base 1. With this design, there is no need to insert and weld the iron pipe 3 and the base 1, thereby improving the preparation efficiency of the connecting pipe. In addition, the base 1 and the iron pipe 3 are highly concentric. After the copper pipe 2 is welded to the base 1, the concentricity between the copper pipe 2 and the iron pipe 3 is also relatively high.

[0081] It should be understood that in this embodiment, the base 1 is also provided with a positioning structure 5, an annular filling groove 6, a positioning surface 7, a guide chamfer 8 and other structures, and the arrangement method thereof is the same as that of the first embodiment, so it will not be repeated here.

[0082] A liquid storage device comprises the above-mentioned connecting pipe.

[0083] A compressor comprises the above-mentioned liquid accumulator.

[0084] 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 in the protection scope of the present invention.

Claims

1. A connecting pipe, characterized in that: It includes base, copper pipe and iron pipe, among which: The base is annular, and its outer circumference is provided with an annular step formed by outward protrusion; the iron pipe is arranged in the inner hole of the base and is fixedly connected to the base; the copper pipe and the iron pipe are located on the same axis and are fixedly connected to the base or the iron pipe; a positioning structure for preliminarily fixing the iron pipe and / or the copper pipe is provided on the inner side wall of the base; the iron pipe is welded and fixed to the base, and the copper pipe is welded and fixed to the base or the iron pipe; an abutment structure is provided at the end of the iron pipe, and the abutment structure abuts against the top of the positioning structure; the copper pipe abuts against the abutment structure and is welded and fixed to the base.

2. A connecting pipe according to claim 1, characterized in that: The positioning structure comprises a plurality of positioning expansion ribs, which are arranged on the inner side wall of the base along the circumferential direction; the copper tube and / or the iron tube are in close contact with the positioning expansion ribs.

3. A connecting pipe according to claim 2, characterized in that: The end of the iron pipe is provided with an expansion section formed by expanding outward, the expansion section is arranged on the inner hole of the base and abuts against the top of the positioning rib; the copper pipe is inserted into the expansion section, and the copper pipe and the iron pipe are both welded and fixed to the base.

4. A connecting pipe according to claim 1, characterized in that: The positioning structure is an annular positioning step arranged on the inner side wall of the base or a plurality of positioning ribs arranged on the inner side wall of the base along the circumferential direction.

5. A connecting pipe according to claim 1, characterized in that: The end of the iron pipe is provided with a hole expansion section, the hole expansion section is located outside the base, the copper pipe is inserted into the hole expansion section and is welded and fixed to the iron pipe.

6. A connecting pipe according to claim 1, characterized in that: The iron pipe and the base are integrally formed, the copper pipe is inserted into the inner hole of the base and abuts against the top of the iron pipe, and is fixed to the base by welding.

7. A liquid storage device, characterized in that: A connecting pipe comprising any one of claims 1 to 6.

8. A compressor, characterized in that: A liquid reservoir comprising the liquid reservoir described in claim 7.

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