Connecting pipe structure and four-way reversing valve

Abstract

The utility model provides a connecting pipe structure and a four-way reversing valve, the connecting pipe structure comprises a stainless steel pipe and a connecting pipe, and the connecting pipe structure also comprises a bushing and a joint made of copper material; one end of the lining is inserted into one end of the stainless steel pipe and is fixedly welded and sealed with the stainless steel pipe in the circumferential direction; an annular first reducing part is arranged on the side wall of the stainless steel pipe, one end of the connector is connected to the outer portion of the lining in a sleeving mode, one end of the connector is inserted into one end of the stainless steel pipe and abuts against the first reducing part, and one end of the connector, the lining and one end of the stainless steel pipe are fixedly welded in the circumferential direction and sealed; one end of the connecting pipe is inserted into the other end of the joint and is fixedly welded and sealed with the joint in the circumferential direction; one end of the connecting pipe, the other end of the lining and the inner wall of the connector define an annular containing cavity. The four-way reversing valve comprises the connecting pipe structure. By means of the structural design of the connecting pipe, the situation that weld beading falls into a valve body of the four-way reversing valve can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of four-way reversing valves, in particular to a connecting pipe structure and a four-way reversing valve. Background Art

[0002] Four-way reversing valves are mainly used in heat pump air conditioners, water heaters and other systems. They are mainly used to switch the flow direction of the refrigerant flow channel in the system, thereby realizing the cooling, heating, defrosting and other functions of the entire system;

[0003] At present, the D interface, E interface, S interface and C interface of the four-way reversing valve and the connecting pipe (external pipe made of copper material) are all welded by flame brazing using silver-free solder. In order to realize the welding of stainless steel pipe (D interface, E interface, S interface and C interface of the four-way reversing valve are all stainless steel pipes) and copper pipe (connecting pipe made of copper material), it is necessary to embed a copper connector in the stainless steel pipe and then weld the connector to the copper pipe.

[0004] Among them, the stainless steel pipe and the connector (copper material) are connected mainly by brazing and fusion welding. The connector is inserted into the stainless steel pipe, and welding is performed between the inner wall of the stainless steel pipe and the front end of the connector, as well as between the end of the stainless steel pipe and the outer wall of the connector to fix the stainless steel pipe and the connector.

[0005] However, when the above-mentioned welding method is used to weld each stainless steel pipe and the connecting pipe of the four-way reversing valve, it is easy for the weld nodule to fall into the valve body of the four-way reversing valve, which may cause the four-way reversing valve to be scalded or stuck by foreign objects, and then cause the four-way reversing valve to fail to work normally, so that the refrigeration system may be paralyzed; in addition, the above-mentioned welding method also has the disadvantage of poor welding firmness of the stainless steel pipe and the connecting pipe. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a connecting pipe structure and a four-way reversing valve. The connecting pipe structure design can avoid the situation where the welding nodule falls into the valve body of the four-way reversing valve, and the welding quality is high. The stainless steel pipe and the connecting pipe are firmly connected. At the same time, it has the advantages of simple structure and low assembly cost.

[0007] The utility model provides a connecting pipe structure, comprising a stainless steel pipe and a connecting pipe, the connecting pipe structure also comprising a bushing and a joint made of copper material; one end of the bushing is inserted into one end of the stainless steel pipe and is circumferentially welded and sealed with the stainless steel pipe; a first diameter-reducing portion in the shape of an annulus is arranged on the side wall of the stainless steel pipe, one end of the joint is sleeved on the outside of the bushing, one end of the joint is inserted into one end of the stainless steel pipe and is abutted against the first diameter-reducing portion, one end of the joint is circumferentially welded and fixed with the bushing and one end of the stainless steel pipe, and one end of the joint is circumferentially welded and fixed with the bushing and one end of the stainless steel pipe, and is sealed; one end of the connecting pipe is inserted into the other end of the joint and is circumferentially welded and fixed with the joint, and is sealed; one end of the connecting pipe, the other end of the bushing and the inner wall of the joint form a ring-shaped cavity.

[0008] The structural design of the connecting pipe of the utility model can prevent the weld nodule from falling into the valve body of the four-way reversing valve, that is, when one end of the connecting pipe is welded to the joint through the solder, when the solder flows to one end of the connecting pipe, the other end of the bushing and the cavity surrounded by the inner wall of the joint, the solder can be cooled and solidified, thereby preventing the weld nodule from entering the stainless steel pipe, the bushing and the connecting pipe, that is, preventing the weld nodule from falling into the valve body of the four-way reversing valve, and the above-mentioned connecting pipe structure has the advantages of high welding quality, firm connection between the stainless steel pipe and the connecting pipe, simple structure and low assembly cost.

[0009] In a possible embodiment, a second ring-shaped reducing portion is provided on the side wall of the stainless steel pipe, the second reducing portion is located on the inner side of the first reducing portion, and one end of the bushing abuts against the second reducing portion; by adopting this structure, after one end of the bushing is inserted into one end of the stainless steel pipe, one end of the bushing can abut against the second reducing portion, thereby limiting the position of the bushing and prompting the assembler that one end of the bushing and one end of the stainless steel pipe have been plugged into place.

[0010] In a possible embodiment, a ring-shaped flared portion is provided on the outer end portion of the stainless steel tube, and a ring-shaped weld is formed between the inner side wall of the flared portion and the outer side wall of the joint; through the setting of the flared portion, under the action of the flared portion, when one end of the joint is plugged into one end of the stainless steel tube, the flared portion can cooperate with one end of the joint to guide so that one end of the joint is inserted into one end of the stainless steel tube, that is, it can facilitate the plugging of one end of the joint and one end of the stainless steel tube, and when one end of the joint is welded to one end of the stainless steel tube, the solder can more easily enter the gap between one end of the joint and one end of the stainless steel tube through the flared portion, thereby improving the reliability and firmness of the welding and fixation of one end of the joint and one end of the stainless steel tube. In addition, a ring-shaped weld is formed between the inner side wall of the flared portion and the outer side wall of the joint, and the solder located in the weld can further realize the welding and fixation of one end of the joint and one end of the stainless steel tube, so as to further improve the welding firmness.

[0011] In a possible embodiment, one end of the connecting pipe abuts against the other end of the bushing; by adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, one end of the connecting pipe can abut against the other end of the bushing, thereby limiting the connecting pipe and prompting the assembler that the connecting pipe and the joint have been plugged into place.

[0012] In a possible embodiment, a third reducing portion in the shape of a ring is provided on the side wall of the joint, and one end of the connecting pipe is sleeved on the outside of the other end of the bushing and abuts against the third reducing portion; by adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, one end of the connecting pipe can abut against the third reducing portion, thereby limiting the connecting pipe and prompting the assembler that one end of the connecting pipe and the other end of the joint have been plugged into place.

[0013] In a possible embodiment, the other end of the bushing is provided with a conical annular reduction portion, which is inserted into one end of the connecting pipe. By adopting this structure, the other end of the bushing can be more easily inserted into one end of the connecting pipe under the action of the annular reduction portion, that is, when the other end of the bushing is mated and plugged with one end of the connecting pipe, the annular reduction portion can play a guiding role.

[0014] In a possible embodiment, a fourth reducing portion in the shape of a ring is provided on the side wall of the bushing, and one end of the connecting pipe is sleeved on the outside of the other end of the bushing and abuts against the fourth reducing portion; by adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, the other end of the connecting pipe can also be sleeved on the outside of the other end of the bushing and abut against the fourth reducing portion, thereby achieving the limitation of one end of the connecting pipe and the other end of the bushing, and can prompt the assembler that one end of the connecting pipe has been plugged into place with the other end of the joint, and can prompt that one end of the connecting pipe and the other end of the bushing have been sleeved into place.

[0015] A four-way reversing valve, wherein the connection structure between the D interface and the connecting pipe, the connection structure between the E interface and the connecting pipe, the connection structure between the S interface and the connecting pipe, and the connection structure between the C interface and the connecting pipe of the four-way reversing valve all adopt any form of the connecting pipe structure as above; by adopting this method, the D interface and the connecting pipe of the four-way reversing valve, the E interface and the connecting pipe of the four-way reversing valve, the S interface and the connecting pipe of the four-way reversing valve, and the C interface and the connecting pipe of the four-way reversing valve can all be conveniently welded and fixed together, that is, the welding efficiency can be improved, and the welding difficulty can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure when the connecting pipe structure adopts the technical solution of the first embodiment;

[0017] Figure 2It is a schematic cross-sectional view of the connecting pipe structure when the technical solution of the second embodiment is adopted;

[0018] Figure 3 It is a schematic cross-sectional view of the structure when the connecting pipe structure adopts the technical solution of the third embodiment;

[0019] Figure 4 It is a schematic cross-sectional view of the structure when the connecting pipe structure adopts the technical solution of the fourth embodiment;

[0020] Figure 5 It is a schematic cross-sectional view of the structure when the connecting pipe structure adopts the technical solution of the fifth embodiment;

[0021] Figure 6 It is a structural schematic diagram of a four-way reversing valve. DETAILED DESCRIPTION

[0022] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1

[0027] See also Figure 1As shown, an embodiment of the present application discloses a connecting pipe structure, including a stainless steel pipe 1 and a connecting pipe 2, the connecting pipe structure also includes a bushing 3 and a joint 4 made of copper material; one end of the bushing 3 is inserted into one end of the stainless steel pipe 1 and is circumferentially welded and sealed with the stainless steel pipe 1; a first ring-shaped reducing portion 11 is provided on the side wall of the stainless steel pipe 1, one end of the joint 4 is sleeved on the outside of the bushing 3, one end of the joint 4 is inserted into one end of the stainless steel pipe 1 and is abutted against the first reducing portion 11, one end of the joint 4 is circumferentially welded and sealed with the bushing 3 and one end of the stainless steel pipe 1; one end of the connecting pipe 2 is inserted into the other end of the joint 4 and is circumferentially welded and sealed with the joint 4; one end of the connecting pipe 2, the other end of the bushing 3 and the inner wall of the joint 4 form a ring-shaped cavity 6.

[0028] The above-mentioned connecting pipe structure design can prevent the weld nodule from falling into the valve body of the four-way reversing valve. That is, when one end of the connecting pipe is welded to the joint through solder, if the solder flows to one end of the connecting pipe, the other end of the bushing and the cavity surrounded by the inner wall of the joint, the solder can be cooled and solidified, thereby preventing the weld nodule from entering the stainless steel pipe, the bushing and the connecting pipe, that is, preventing the weld nodule from falling into the valve body of the four-way reversing valve.

[0029] A ring-shaped flared portion 13 is provided on the outer end portion of the stainless steel pipe 1, and a ring-shaped weld 14 is formed between the inner side wall of the flared portion 13 and the outer side wall of the joint 4; through the setting of the flared portion, under the action of the flared portion, when one end of the joint is plugged into one end of the stainless steel pipe, the flared portion can cooperate with one end of the joint to guide so that one end of the joint is inserted into one end of the stainless steel pipe, that is, it can bring convenience to the plugging of one end of the joint and one end of the stainless steel pipe, and when one end of the joint is welded to one end of the stainless steel pipe, the solder can more easily enter the gap between one end of the joint and one end of the stainless steel pipe through the flared portion, thereby improving the reliability and firmness of the welding and fixing of one end of the joint and one end of the stainless steel pipe. In addition, a ring-shaped weld is formed between the inner side wall of the flared portion and the outer side wall of the joint, and the solder located in the weld can further realize the welding and fixing of one end of the joint and one end of the stainless steel pipe, so as to further improve the welding firmness.

[0030] One end of the connecting pipe 2 abuts against the other end of the bushing 3; by adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, one end of the connecting pipe can abut against the other end of the bushing, thereby limiting the connecting pipe and reminding the assembler that the connecting pipe and the joint have been plugged in place.

[0031] Embodiment 2

[0032] See also Figure 2As shown, what is different from the first embodiment is that a ring-shaped second reducing portion 12 is provided on the side wall of the stainless steel pipe 1, the second reducing portion 12 is located on the inner side of the first reducing portion 11, and one end of the bushing 3 abuts against the second reducing portion 12; by adopting this structure, after one end of the bushing is inserted into one end of the stainless steel pipe, one end of the bushing can abut against the second reducing portion, thereby limiting the bushing and prompting the assembler that one end of the bushing and one end of the stainless steel pipe have been plugged into place.

[0033] Embodiment 3

[0034] See also Figure 3 As shown, what is different from the second embodiment is that a ring-shaped third reducing portion 41 is provided on the side wall of the joint 4, and one end of the connecting pipe 2 is sleeved on the outside of the other end of the bushing 3 and abuts against the third reducing portion 41; by adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, one end of the connecting pipe can abut against the third reducing portion, thereby limiting the connecting pipe and prompting the assembler that one end of the connecting pipe and the other end of the joint have been plugged in place.

[0035] Embodiment 4

[0036] See also Figure 4 As shown, the difference from the third embodiment is that: the other end of the bushing 3 is provided with a conical annular reduction portion 31, and the annular reduction portion 31 is inserted into one end of the connecting pipe 2; by adopting this structure, under the action of the annular reduction portion, the other end of the bushing can be more easily inserted into one end of the connecting pipe, that is, when the other end of the bushing is plugged into one end of the connecting pipe, the annular reduction portion can play a guiding role.

[0037] Embodiment 5

[0038] See also Figure 5 As shown, what is different from the second embodiment is that a ring-shaped fourth reducing portion 32 is provided on the side wall of the bushing 3, and one end of the connecting pipe 2 is sleeved on the outside of the other end of the bushing 3 and abuts against the fourth reducing portion 32. By adopting this structure, after one end of the connecting pipe is inserted into the other end of the joint, the other end of the connecting pipe can also be sleeved on the outside of the other end of the bushing and abut against the fourth reducing portion, so that one end of the connecting pipe and the other end of the bushing can be limited, and the assembler can be prompted that one end of the connecting pipe has been plugged into the other end of the joint, and can be prompted that one end of the connecting pipe and the other end of the bushing have been sleeved into place.

[0039] Embodiment 6

[0040] See also Figure 6As shown, a four-way reversing valve, the connection structure between the D interface 51 and the connecting pipe of the four-way reversing valve 5, the connection structure between the E interface 52 and the connecting pipe, the connection structure between the S interface 53 and the connecting pipe, and the connection structure between the C interface 54 and the connecting pipe all adopt the connecting pipe structure of any of the above embodiments; by adopting this method, the D interface and the connecting pipe of the four-way reversing valve, the E interface and the connecting pipe of the four-way reversing valve, the S interface and the connecting pipe of the four-way reversing valve, and the C interface and the connecting pipe of the four-way reversing valve can all be conveniently welded and fixed together, that is, the welding efficiency can be improved, and the welding difficulty can be reduced.

[0041] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A connecting pipe structure, comprising a stainless steel pipe (1) and a connecting pipe (2), characterized in that: The connecting pipe structure also includes a bushing (3) and a joint (4) made of copper material; one end of the bushing (3) is inserted into one end of the stainless steel pipe (1) and is circumferentially welded and sealed with the stainless steel pipe (1); a first ring-shaped reducing portion (11) is provided on the side wall of the stainless steel pipe (1); one end of the joint (4) is sleeved on the outside of the bushing (3); one end of the joint (4) is inserted into one end of the stainless steel pipe (1) and is abutted against the first reducing portion (11); one end of the joint (4) is circumferentially welded and sealed with the bushing (3) and one end of the stainless steel pipe (1); one end of the connecting pipe (2) is inserted into the other end of the joint (4) and is circumferentially welded and sealed with the joint (4); one end of the connecting pipe (2), the other end of the bushing (3) and the inner wall of the joint (4) form a ring-shaped cavity (6).

2. The connecting pipe structure according to claim 1, characterized in that: A second diameter reducing portion (12) in an annular shape is provided on the side wall of the stainless steel pipe (1), the second diameter reducing portion (12) is located inside the first diameter reducing portion (11), and one end of the bushing (3) abuts against the second diameter reducing portion (12).

3. The connecting pipe structure according to claim 1, characterized in that: An annular flared portion (13) is provided on the outer end of the stainless steel pipe (1), and an annular weld (14) is formed between the inner wall of the flared portion (13) and the outer wall of the joint (4).

4. The connecting pipe structure according to any one of claims 1 to 3, characterized in that: One end of the connecting pipe (2) abuts against the other end of the bushing (3).

5. The connecting pipe structure according to any one of claims 1 to 3, characterized in that: A third diameter reducing portion (41) in the shape of a ring is provided on the side wall of the joint (4), and one end of the connecting pipe (2) is sleeved on the outside of the other end of the bushing (3) and abuts against the third diameter reducing portion (41).

6. The connecting pipe structure according to claim 5, characterized in that: The other end of the bushing (3) is provided with a conical annular reduced diameter portion (31), and the annular reduced diameter portion (31) is inserted into one end of the connecting pipe (2).

7. The connecting pipe structure according to any one of claims 1 to 3, characterized in that: A fourth diameter reducing portion (32) in the shape of a ring is provided on the side wall of the bushing (3), and one end of the connecting pipe (2) is sleeved on the outside of the other end of the bushing (3) and abuts against the fourth diameter reducing portion (32).

8. A four-way reversing valve, characterized in that: The connection structure between the D interface (51) and the connecting pipe, the connection structure between the E interface (52) and the connecting pipe, the connection structure between the S interface (53) and the connecting pipe, and the connection structure between the C interface (54) and the connecting pipe of the four-way reversing valve (5) all adopt the connecting pipe structure as described in any one of claims 1 to 7 above.

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