Stop valve

Abstract

The utility model provides a stop valve which comprises a valve body which comprises a body portion and a protruding portion which are connected with each other, the protruding portion is arranged on the outer side wall of the body portion, a valve cavity and a valve port which are communicated with each other are arranged in the body portion, a connector is arranged on the protruding portion, and the connector is communicated with the valve cavity through the valve port. The first end of the transition pipe is welded to the protruding part, and the second end of the transition pipe protrudes out of the protruding part in the direction away from the body part; the first end of the connecting pipe is welded to the transition pipe, the second end of the connecting pipe is located on the outer side of the transition pipe and used for being welded to the connecting pipe, the material of the connecting pipe is different from that of the transition pipe, and the material of the connecting pipe is the same as that of the connecting pipe. According to the scheme, the problems that in the prior art, when the pipe component and the connecting pipe of the stop valve are made of different materials, the welding temperature is difficult to guarantee on the installation site, and the welding strength is affected can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a stop valve. Background Art

[0002] A globe valve typically consists of a valve body and a connected pipe. When installing a globe valve onto a heat exchange pipe connection in an air conditioning system or other system connections, the pipe and connection may be made of different materials. This can lead to significant differences in chemical composition and melting points between the pipe and connection. Due to limitations in welding conditions at the installation site, it can be difficult to maintain a precise welding temperature when using processes like flame welding, which can affect weld strength. Utility Model Content

[0003] The utility model provides a stop valve to solve the problem in the prior art that when the pipe component and the connecting pipe of the stop valve are made of different materials, it is difficult to ensure the welding temperature at the installation site, which affects the welding strength.

[0004] The utility model provides a stop valve, which includes: a valve body, including a main body and a raised portion that are connected to each other, the raised portion is arranged on the outer side wall of the main body, a valve cavity and a valve port that are connected to each other are arranged in the main body, an interface is arranged on the raised portion, and the interface is connected to the valve cavity through the valve port; a transition pipe, a first end of the transition pipe is welded to the raised portion, and a second end of the transition pipe protrudes from the raised portion in a direction away from the main body; a connecting pipe, a first end of the connecting pipe is welded to the transition pipe, the second end of the connecting pipe is located on the outside of the transition pipe and is used for welding to the connecting pipe, the material of the connecting pipe is different from that of the transition pipe, and the material of the connecting pipe is the same as that of the connecting pipe.

[0005] Furthermore, one of the transition pipe and the connecting pipe is made of copper; or one of the transition pipe and the connecting pipe is made of stainless steel; or one of the transition pipe and the connecting pipe is made of aluminum.

[0006] Furthermore, the transition pipe is made of copper, the connecting pipe is made of stainless steel, and the transition pipe and the connecting pipe are welded by furnace welding.

[0007] Furthermore, the transition pipe is sleeved with the raised portion, and the second end of the transition pipe protrudes outward from the raised portion away from the main body by a length a, a≥2mm; the connecting pipe is sleeved with the transition pipe, and the sleeve length of the connecting pipe and the transition pipe is b, b≥2mm.

[0008] Furthermore, the sleeve connection length between the transition pipe and the raised portion is c, and c≥2mm.

[0009] Furthermore, the first end of the connecting pipe is inserted into the transition pipe, and the first end of the transition pipe is inserted into the raised portion. Along the axial direction perpendicular to the transition pipe, at least part of the projection of the first end of the connecting pipe is located on the raised portion.

[0010] Furthermore, the first end of the connecting pipe is inserted into the second end of the transition pipe, the first end of the transition pipe is sleeved on the raised portion, and the end surface of the raised portion abuts against the end surface of the first end of the connecting pipe.

[0011] Furthermore, along the axial direction of the transition pipe, the inner diameter of each portion of the transition pipe is the same, and the outer diameter of each portion of the transition pipe is the same.

[0012] Furthermore, the first end of the transition pipe is inserted into the raised portion, and a first stopper is provided in the interface, and the first stopper cooperates with the end face stopper of the first end of the transition pipe.

[0013] Furthermore, the interface includes a first hole section and a second hole section that are interconnected along the axial direction, the second hole section is located on the side of the first hole section away from the valve port, the cross-sectional area of the second hole section is larger than the cross-sectional area of the first hole section, and a step surface is formed between the second hole section and the first hole section. The first end of the transition pipe is passed through the second hole section, and the end face of the first end of the transition pipe abuts against the step surface, and the step surface forms a first stop portion.

[0014] Furthermore, a second stop portion is provided at the second end of the transition pipe. The second stop portion is located outside the protrusion. The outer diameter of the second stop portion is larger than the inner diameter of the connecting pipe. The second stop portion cooperates with the connecting pipe stop.

[0015] Further, the transition pipe includes a first conical pipe section, and the inner diameter of the first conical pipe section gradually increases along the direction from the first end to the second end of the transition pipe, the first end of the connecting pipe is inserted into the second end of the transition pipe, and along the axial direction of the connecting pipe, the projection of the first end of the connecting pipe is on the inner side wall of the first conical pipe section, the end face of the first end of the connecting pipe abuts and cooperates with the first conical pipe section, and the first conical pipe section forms a second stop portion; or, the transition pipe includes a second conical pipe section, and the outer diameter of the first conical pipe section gradually decreases along the direction from the first end to the second end of the transition pipe, the first end of the connecting pipe is sleeved on the second end of the transition pipe, and along the axial direction of the connecting pipe, the projection of the first end of the connecting pipe is on the outer side wall of the second conical pipe section, the end face of the first end of the connecting pipe abuts and cooperates with the second conical pipe section, and the second conical pipe section forms a second stop portion.

[0016] Furthermore, a third stop portion is provided at the first end of the connecting pipe, and the third stop portion is located outside the second end of the transition pipe. The outer diameter of the third stop portion is larger than the inner diameter of the transition pipe, and the third stop portion cooperates with the second end stop of the transition pipe.

[0017] Furthermore, the connecting pipe includes a third conical pipe section, and the inner diameter of the third conical pipe section gradually decreases along the direction from the first end to the second end of the connecting pipe. The second end of the transition pipe is inserted into the first end of the connecting pipe, and the projection of the second end of the transition pipe is on the inner side wall of the third conical pipe section along the axial direction of the connecting pipe. The end face of the second end of the transition pipe abuts and cooperates with the third conical pipe section, and the third conical pipe section forms a third stop portion; or, the connecting pipe includes a fourth conical pipe section, and the outer diameter of the fourth conical pipe section gradually increases along the direction from the first end to the second end of the connecting pipe. The second end of the transition pipe is sleeved on the first end of the connecting pipe, and the projection of the transition pipe is on the outer side wall of the fourth conical pipe section along the axial direction of the connecting pipe. The end face of the second end of the transition pipe abuts and cooperates with the fourth conical pipe section, and the fourth conical pipe section forms a third stop portion.

[0018] By applying the technical solution of the present invention, when installing the stop valve on the pipe of the heat exchange pipeline in the air-conditioning system or the pipe of other systems, the connecting pipe and the pipe are welded. Specifically, in this solution, the connecting pipe and the pipe are made of the same material, have the same chemical composition and melting point, and have better compatibility between the connecting pipe and the pipe. The welding temperature can be more accurately controlled during welding, avoiding welding defects caused by improper temperature control, such as overheating, burn-through, or incomplete welding. Moreover, the connecting pipe and the pipe are made of the same material. At the installation site, it is convenient to weld the connecting pipe and the pipe using common and convenient welding methods such as laser welding, argon arc welding, etc., without having to worry about the adaptability of different materials to the welding process. The most suitable welding method can be selected according to the specific installation environment and conditions, which is convenient for ensuring welding accuracy and improving welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 The structure diagram of the stop valve provided in the first embodiment of the present invention is shown;

[0021] Figure 2 A cross-sectional view of a stop valve provided in Example 1 of the present utility model is shown;

[0022] Figure 3 Shown Figure 2 Schematic diagram of the local structure at A in the middle;

[0023] Figure 4 The structure diagram of the stop valve provided in the second embodiment of the present utility model is shown;

[0024] Figure 5 A cross-sectional view of a stop valve provided in the second embodiment of the present utility model is shown;

[0025] Figure 6 Shown Figure 5 Schematic diagram of the local structure at B in the middle;

[0026] Figure 7 The structure diagram of the stop valve provided in the third embodiment of the present invention is shown;

[0027] Figure 8 A cross-sectional view of a stop valve provided in a third embodiment of the present invention is shown;

[0028] Figure 9 Shown Figure 8 Schematic diagram of the local structure at C in the middle;

[0029] Figure 10 A partial structural diagram of a stop valve provided in a fourth embodiment of the present utility model is shown;

[0030] Figure 11 The structure diagram of the stop valve provided in the fifth embodiment of the present invention is shown;

[0031] Figure 12 A cross-sectional view of a stop valve provided in a fifth embodiment of the present invention is shown;

[0032] Figure 13 Shown Figure 12 Schematic diagram of the local structure at D in the middle;

[0033] Figure 14 A partial structural diagram of a stop valve provided in Example 6 of the present utility model is shown.

[0034] The above drawings include the following reference numerals:

[0035] 10. Valve body; 11. Main body; 12. Raised part;

[0036] 101, valve chamber; 102, valve port;

[0037] 103, interface; 1030, first stopper; 1031, first hole section; 1032, second hole section;

[0038] 20. Transition pipe; 21. Second stopper;

[0039] 22. First straight pipe section; 23. Second straight pipe section;

[0040] 24. The third straight pipe section; 25. The fourth straight pipe section;

[0041] 30. Connecting pipe; 31. Third stopper;

[0042] 32. The fifth straight pipe section; 33. The sixth straight pipe section;

[0043] 34. The seventh straight pipe section; 35. The eighth straight pipe section. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] like Figures 1 to 3 As shown, the first embodiment of the present invention provides a stop valve, which includes a valve body 10, a transition pipe 20, and a connecting pipe. The valve body 10 includes a main body 11 and a raised portion 12, which are connected to each other. The raised portion 12 is provided on the outer wall of the main body 11. The main body 11 is provided with a valve cavity 101 and a valve port 102, which are connected to each other. The raised portion 12 is provided with an interface 103, which is connected to the valve cavity 101 through the valve port 102. The valve cavity 101 extends along the axis of the main body 11. The valve port 102 is provided on the side wall of the main body 11 and penetrates the side wall of the main body 11. The axis direction of the raised portion 12 is perpendicular to the axis direction of the valve body 10. The first end of the transition pipe 20 is welded to the raised portion 12, and the second end of the transition pipe 20 protrudes from the raised portion 12 in a direction away from the main body 11; the first end of the connecting pipe 30 is welded to the transition pipe 20, and the second end of the connecting pipe 30 is located on the outside of the transition pipe 20 and is used for welding to the connecting pipe. The material of the connecting pipe 30 is different from that of the transition pipe 20, and the material of the connecting pipe 30 is the same as that of the connecting pipe.

[0046] By applying the technical solution of the present invention, when the stop valve is installed on the pipe of the heat exchange pipeline in the air-conditioning system or the pipe of other systems, the connecting pipe 30 is welded to the pipe. Specifically, in this solution, the connecting pipe 30 and the pipe are made of the same material, chemical composition and melting point, and the compatibility between the connecting pipe 30 and the pipe is better. The welding temperature can be more accurately controlled during welding, avoiding welding defects caused by improper temperature control, such as overheating, burn-through or incomplete welding. In addition, the connecting pipe 30 and the pipe are made of the same material. At the installation site, it is convenient to weld the connecting pipe 30 and the pipe using common and convenient welding methods such as laser welding, argon arc welding and other welding processes. There is no need to worry about the adaptability of different materials to the welding process. The most suitable welding method can be selected according to the specific installation environment and conditions, which is convenient for ensuring welding accuracy and improving welding strength.

[0047] This solution does not limit the specific material of the connecting pipe 30 and the transition pipe 20, wherein one of the transition pipe 20 and the connecting pipe 30 is made of copper; or, one of the transition pipe 20 and the connecting pipe 30 is made of stainless steel; or, one of the transition pipe 20 and the connecting pipe 30 is made of aluminum.

[0048] In the embodiment of this solution, the transition pipe 20 is made of copper, the connecting pipe 30 is made of stainless steel, and the transition pipe 20 and the connecting pipe 30 are welded by furnace welding.

[0049] Furthermore, the first end of the transition pipe 20 is sleeved with the raised portion 12 and welded to the raised portion 12, and the second end of the transition pipe 20 protrudes from the raised portion 12 in a direction away from the main body 11, and the outward protruding length of the transition pipe 20 is a, a≥2mm; the first end of the connecting pipe 30 is sleeved with the transition pipe 20 and welded to the transition pipe 20 by furnace welding, and the second end of the connecting pipe 30 is located on the outside of the transition pipe 20 and is used to be sleeved with the connecting pipe, and the sleeve length of the connecting pipe 30 and the transition pipe 20 is b, b≥2mm.

[0050] By applying the technical solution of the present invention, when the stop valve of this embodiment is installed in an air-conditioning system, when the copper stop valve of this solution is assembled on the connecting pipe of the heat exchange pipeline made of stainless steel, the connecting pipe 30 of the stop valve can be welded to the connecting pipe of the heat exchange pipeline by argon arc welding or laser welding.

[0051] Specifically, the shutoff valve's connecting pipe 30 is made of stainless steel, the same material as the heat exchange piping in the air conditioning system, with the same chemical composition and melting point. This makes it suitable for welding to the heat exchange piping using the same metal type, eliminating the need for flame welding. Argon arc welding or laser welding can be used, ensuring weld strength. Furthermore, in this solution, the stainless steel connecting pipe 30 and the copper transition pipe 20 are combined to form a pipe assembly. Compared to conventional solutions using only copper pipe assembly, this solution reduces copper usage, lowering the material cost of the shutoff valve, while maintaining the same pipe length.

[0052] In the embodiment of this solution, the valve body 10 is made of brass, and the transition pipe 20 is made of copper. When assembling the stop valve, because the welding temperature of the copper transition pipe 20 and the stainless steel connecting pipe 30 is much higher than the welding temperature of the brass valve body 10 and the copper transition pipe 20, it is necessary to furnace-weld the transition pipe 20 and the connecting pipe 30 before welding the transition pipe 20 to the valve body 10. The connecting pipe 30 and the transition pipe 20 are relatively small in size. After the connecting pipe 30 and the transition pipe 20 are sleeved together and placed in a brazing furnace for welding, the welding quality is high and the space occupied in the brazing furnace is small. Multiple sleeved connecting pipes 30 and transition pipes 20 can be welded simultaneously in the same brazing furnace, resulting in high welding efficiency.

[0053] When welding the connecting pipe 30 to the transition pipe 20, the first end of the connecting pipe 30 is sleeved onto the transition pipe 20. The sleeved length between the connecting pipe 30 and the transition pipe 20 is b, where b ≥ 2 mm. This allows the second end of the connecting pipe 30 to be positioned outside the transition pipe 20 and to be sleeved onto the stainless steel connecting pipe in the air conditioning system. The connecting pipe 30 and the transition pipe 20 are then welded together using furnace brazing. This minimum overlap ensures weld strength between the connecting pipe 30 and the transition pipe 20. b can be set to 2 mm, 3 mm, or 4 mm, for example.

[0054] After welding the connecting pipe 30 to the transition pipe 20, the first end of the transition pipe 20 is sleeved onto the raised portion 12, so that the second end of the transition pipe 20 protrudes outward from the raised portion 12, away from the main body 11. The outward protrusion of the transition pipe 20 is a length a, where a ≥ 2 mm. The transition pipe 20 and the connecting pipe 30 are then welded together using flame welding or high-frequency welding. Specifically, the sidewall of the transition pipe 20 and the end surface of the raised portion 12, facing away from the main body 11, form a stepped structure for receiving the welding ring filler metal. This arrangement facilitates the placement of the welding ring filler metal, achieving a more stable welding effect.

[0055] In this solution, if a is less than 2 mm, the distance between the weld between the transition pipe 20 and the valve body 10 and the connecting pipe 30 is relatively short in the axial direction. During flame welding of the transition pipe 20 and the valve body 10, the flame may burn the connecting pipe 30, causing it to heat to 450°C-850°C. Within this temperature range, intergranular corrosion of the stainless steel connecting pipe 30 is likely to occur. Specifically, within this temperature range, chromium carbide easily precipitates at grain boundaries, leading to chromium depletion, thereby increasing the material's tendency to intergranular corrosion and causing cracking and leakage in the connecting pipe 30. Furthermore, if a is less than 2 mm, the transition pipe 20 may heat too slowly, affecting welding quality and speed.

[0056] Among them, a can be set to 2mm, 3mm or 4mm, etc.

[0057] Furthermore, the sleeve length between the transition pipe 20 and the raised portion 12 is c, c ≥ 2 mm. This configuration can maximize the overlap length between the transition pipe 20 and the raised portion 12 and further enhance the connection strength between the transition pipe 20 and the raised portion 12.

[0058] Among them, c can be set to 2mm, 3mm or 4mm, etc.

[0059] like Figure 3 As shown, the first end of the connecting pipe 30 is disposed within the transition pipe 20, which in turn is disposed within the raised portion 12. Along a direction perpendicular to the axis of the transition pipe 20, at least a portion of the projection of the first end of the connecting pipe 30 is located on the raised portion 12. That is, the connecting pipe 30 and the raised portion 12 of the transition pipe 20 are sequentially sleeved from the inside out.

[0060] Furthermore, the transition pipe 20 is inserted into the raised portion 12, and a first stopper 1030 is provided in the interface 103. The first stopper 1030 engages with the end surface stopper of the first end of the transition pipe 20. The provision of the first stopper 1030 ensures the positioning accuracy of the transition pipe 20 during the assembly process.

[0061] Specifically, the interface 103 includes a first bore section 1031 and a second bore section 1032, which are interconnected along the axial direction. The second bore section 1032 is located on the side of the first bore section 1031 away from the valve port 102. The cross-sectional area of the second bore section 1032 is larger than that of the first bore section 1031. A stepped surface is formed between the second bore section 1032 and the first bore section 1031. The first end of the transition tube 20 is inserted into the second bore section 1032, and the end surface of the first end of the transition tube 20 abuts the stepped surface, forming the first stop 1030. The abutment between the first end of the transition tube 20 and the stepped surface simplifies the assembly process and ensures the accurate positioning of the transition tube 20 within the interface 103. Furthermore, this arrangement has a simple structure and facilitates the processing of the interface 103.

[0062] like Figures 4 to 6 As shown, the second embodiment of the present invention provides a shut-off valve. This embodiment differs from the first embodiment in that the first end of the connecting pipe 30 is inserted into the second end of the transition pipe 20, which is then sleeved onto the raised portion 12. The end surface of the raised portion 12 abuts against the end surface of the first end of the connecting pipe 30. That is, the transition pipe 20 is simultaneously sleeved onto both the first end of the connecting pipe 30 and the raised portion 12. The abutment between the end surface of the raised portion 12 and the end surface of the first end of the connecting pipe 30 further improves the assembly accuracy and stability of the transition pipe 20 and the raised portion 12. Furthermore, when the connecting pipe 30 or the main body 11 of the shut-off valve is subjected to external force and swings, the transition pipe 20 will preferentially limit the raised portion 12 and the connecting pipe 30, reducing or preventing the possibility of weld cracking.

[0063] Furthermore, along the axis of the transition pipe 20, the inner diameter of the transition pipe 20 is the same at all locations, and the outer diameter of the transition pipe 20 is the same at all locations. This arrangement facilitates the processing of the transition pipe 20 and facilitates the assembly of the transition pipe 20 with the connecting pipe 30 and with the raised portion 12.

[0064] like Figures 7 to 9 As shown, the third embodiment of the present invention provides a stop valve, which differs from the first embodiment in that a second stop portion 21 is provided at the second end of the transition pipe 20. The second stop portion 21 is located outside the protrusion 12 and engages with the connecting pipe 30. The engagement of the second stop portion 21 with the stop of the connecting pipe 30 allows the connecting pipe 30 to be quickly and accurately installed, simplifying the assembly process and improving assembly efficiency.

[0065] Specifically, the length a of the second end of the transition pipe 20 protruding toward the outside of the protruding portion 12 is not less than 5 mm. This arrangement facilitates the processing of the second stopper 21 .

[0066] At this time, a can be set to 5mm, 6mm or 7mm, etc.

[0067] Furthermore, the transition pipe 20 includes a first tapered pipe section, the inner diameter of which gradually increases from the first end to the second end of the transition pipe 20. The first end of the connecting pipe 30 is disposed within the second end of the transition pipe 20. Along the axis of the connecting pipe 30, the projection of the first end of the connecting pipe 30 is on the inner sidewall of the first tapered pipe section. The end surface of the first end of the connecting pipe 30 abuts against the first tapered pipe section, forming the second stop 21. The design of the first tapered pipe section provides an effective stop mechanism, preventing the connecting pipe 30 from shifting within the transition pipe 20 and facilitating flaring.

[0068] In this embodiment, the minimum inner diameter of the first conical tube section is smaller than the outer diameter of the first end of the connecting tube 30 , and the maximum inner diameter of the first conical tube section is greater than or equal to the outer diameter of the first end of the connecting tube 30 .

[0069] Specifically, the transition pipe 20 includes a first straight pipe section 22, a first tapered pipe section, and a second straight pipe section 23, which are sequentially connected along the axial direction. The inner diameter of the first straight pipe section 22 is smaller than that of the second straight pipe section 23. The inner diameter of the first tapered pipe section gradually increases along the direction from the first straight pipe section 22 to the second straight pipe section 23. The end of the first straight pipe section 22, distal from the first tapered pipe section, is inserted into the raised portion 12. This arrangement facilitates the processing of the transition pipe 20.

[0070] like Figure 10As shown, the fourth embodiment of the present invention provides a stop valve, which differs from the third embodiment in that the transition pipe 20 includes a second tapered pipe section, the outer diameter of which gradually decreases from the first end to the second end of the transition pipe 20. The first end of the connecting pipe 30 is sleeved onto the second end of the transition pipe 20. Along the axis of the connecting pipe 30, the projection of the first end of the connecting pipe 30 is on the outer wall of the second tapered pipe section. The end surface of the first end of the connecting pipe 30 abuts and cooperates with the outer wall of the second tapered pipe section, and the second tapered pipe section forms a second stop portion 21. The design of the second tapered pipe section provides an effective stop mechanism, preventing the connecting pipe 30 from displacing outside the transition pipe 20.

[0071] In this embodiment, the minimum outer diameter of the second tapered tube section is smaller than or equal to the inner diameter of the first end of the connecting tube 30 , and the maximum outer diameter of the second tapered tube section is larger than the inner diameter of the first end of the connecting tube 30 .

[0072] Specifically, the transition pipe 20 includes a third straight pipe section 24, a second tapered pipe section, and a fourth straight pipe section 25, which are sequentially connected along the axial direction. The outer diameter of the third straight pipe section 24 is larger than that of the fourth straight pipe section 25. The outer diameter of the second tapered pipe section gradually decreases along the direction from the third straight pipe section 24 to the fourth straight pipe section 25. The end of the third straight pipe section 24 away from the second tapered pipe section is inserted into the raised portion 12.

[0073] like Figures 11 to 13 As shown, the fifth embodiment of the present invention provides a stop valve. This differs from the first embodiment in that a third stopper 31 is provided at the first end of the connecting pipe 30. The third stopper 31 is located outside the second end of the transition pipe 20 and engages with the second end stopper of the transition pipe 20. The third stopper 31 engages with the second end stopper of the transition pipe 20 to ensure precise positioning of the transition pipe 20 and the connecting pipe 30, simplifying the assembly process and improving assembly efficiency.

[0074] Furthermore, the connecting tube 30 includes a third tapered tube section, the inner diameter of which gradually decreases from the first end to the second end of the connecting tube 30. The second end of the transition tube 20 is inserted into the first end of the connecting tube 30. Along the axis of the connecting tube 30, the second end of the transition tube 20 is projected onto the inner sidewall of the third tapered tube section. The end surface of the second end of the transition tube 20 abuts against the third tapered tube section, forming a third stopper 31. The design of the second tapered tube section provides an effective stop mechanism, preventing the connecting tube 30 from displacing outside the transition tube 20.

[0075] In this embodiment, the minimum outer diameter of the third conical tube section is smaller than the outer diameter of the transition tube 20 , and the maximum inner diameter of the third conical tube section is greater than or equal to the outer diameter of the transition tube 20 .

[0076] Specifically, the connecting pipe 30 includes a fifth straight pipe section 32, a third tapered pipe section, and a sixth straight pipe section 33, which are sequentially connected along the axial direction. The inner diameter of the fifth straight pipe section 32 is larger than that of the sixth straight pipe section 33, and the inner diameter of the third tapered pipe section gradually decreases along the direction from the fifth straight pipe section 32 to the sixth straight pipe section 33. The fifth straight pipe section 32 is sleeved onto the second end of the transition pipe 20.

[0077] like Figure 14 As shown, embodiment 6 of the present invention provides a stop valve, which is different from embodiment 5 in that the connecting pipe 30 includes a fourth conical pipe section, and the outer diameter of the fourth conical pipe section gradually increases along the direction from the first end to the second end of the connecting pipe 30. The second end of the transition pipe 20 is sleeved on the first end of the connecting pipe 30. Along the axial direction of the connecting pipe 30, the projection of the transition pipe 20 is on the outer side wall of the fourth conical pipe section, and the end face of the second end of the transition pipe 20 abuts against the fourth conical pipe section, and the fourth conical pipe section forms a third stop portion 31.

[0078] Furthermore, the minimum outer diameter of the fourth conical tube segment is smaller than or equal to the inner diameter of the second end of the transition tube 20 , and the maximum outer diameter of the fourth conical tube segment is larger than the inner diameter of the second end of the transition tube 20 .

[0079] Specifically, connecting pipe 30 includes a seventh straight pipe section 34, a fourth tapered pipe section, and an eighth straight pipe section 35, which are sequentially connected along the axial direction. The outer diameter of seventh straight pipe section 34 is smaller than that of eighth straight pipe section 35, and the outer diameter of the fourth tapered pipe section gradually increases from the seventh straight pipe section 34 to the eighth straight pipe section 35. Seventh straight pipe section 34 is disposed within the second end of transition pipe 20.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0082] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0083] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0084] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stop valve, characterized in that: The stop valve comprises: A valve body (10) comprises a main body (11) and a raised portion (12) connected to each other, wherein the raised portion (12) is arranged on the outer side wall of the main body (11), a valve cavity (101) and a valve port (102) communicating with each other are arranged in the main body (11), and an interface (103) is arranged on the raised portion (12), and the interface (103) is communicated with the valve cavity (101) through the valve port (102); a transition pipe (20), wherein a first end of the transition pipe (20) is welded to the raised portion (12), and a second end of the transition pipe (20) protrudes from the raised portion (12) in a direction away from the main body (11); A connecting pipe (30), wherein a first end of the connecting pipe (30) is welded to the transition pipe (20), a second end of the connecting pipe (30) is located outside the transition pipe (20) and is used for welding to the connecting pipe, a material of the connecting pipe (30) is different from that of the transition pipe (20), and a material of the connecting pipe (30) is the same as that of the connecting pipe.

2. The stop valve according to claim 1, characterized in that One of the transition pipe (20) and the connecting pipe (30) is made of copper; or, One of the transition pipe (20) and the connecting pipe (30) is made of stainless steel; or, One of the transition pipe (20) and the connecting pipe (30) is made of aluminum.

3. The stop valve according to claim 2, characterized in that The transition pipe (20) is made of copper, the connecting pipe (30) is made of stainless steel, and the transition pipe (20) and the connecting pipe (30) are welded by furnace welding.

4. The stop valve according to claim 1, characterized in that The transition pipe (20) is sleeved with the raised portion (12), and the second end of the transition pipe (20) protrudes outward from the raised portion (12) in a direction away from the main body (11) by a length a, where a≥2mm; The connecting pipe (30) is sleeved with the transition pipe (20), and the sleeved length of the connecting pipe (30) and the transition pipe (20) is b, where b is greater than or equal to 2 mm.

5. The stop valve according to claim 4, characterized in that The sleeve connection length between the transition pipe (20) and the raised portion (12) is c, and c≥2mm.

6. The stop valve according to claim 4, characterized in that The first end of the connecting pipe (30) is inserted into the transition pipe (20), and the first end of the transition pipe (20) is inserted into the raised portion (12). Along a direction perpendicular to the axis of the transition pipe (20), at least a portion of the projection of the first end of the connecting pipe (30) is located on the raised portion (12).

7. The stop valve according to claim 4, characterized in that The first end of the connecting pipe (30) is inserted into the second end of the transition pipe (20), the first end of the transition pipe (20) is sleeved on the raised portion (12), and the end surface of the raised portion (12) abuts against the end surface of the first end of the connecting pipe (30).

8. The stop valve according to claim 6 or 7, characterized in that: Along the axial direction of the transition pipe (20), the inner diameter of each portion of the transition pipe (20) is the same, and the outer diameter of each portion of the transition pipe (20) is the same.

9. The stop valve according to claim 4, characterized in that: The first end of the transition pipe (20) is inserted into the raised portion (12), and a first stopper (1030) is provided in the interface (103), and the first stopper (1030) cooperates with the end face stopper of the first end of the transition pipe (20).

10. The stop valve according to claim 9, characterized in that The interface (103) comprises a first hole section (1031) and a second hole section (1032) which are interconnected along an axial direction, the second hole section (1032) being located on a side of the first hole section (1031) away from the valve port (102), the cross-sectional area of the second hole section (1032) being larger than the cross-sectional area of the first hole section (1031), a stepped surface being formed between the second hole section (1032) and the first hole section (1031), the first end of the transition pipe (20) being passed through the second hole section (1032), the end face of the first end of the transition pipe (20) being in contact with the stepped surface, and the stepped surface forming the first stopper (1030).

11. The stop valve according to claim 4, characterized in that A second stopper (21) is provided at the second end of the transition pipe (20), the second stopper (21) being located outside the protruding portion (12), the outer diameter of the second stopper (21) being larger than the inner diameter of the connecting pipe (30), and the second stopper (21) being engaged with the connecting pipe (30) in a stopper manner.

12. The stop valve according to claim 11, characterized in that The transition pipe (20) includes a first tapered pipe section, and the inner diameter of the first tapered pipe section gradually increases along the direction from the first end to the second end of the transition pipe (20). The first end of the connecting pipe (30) is inserted into the second end of the transition pipe (20). Along the axial direction of the connecting pipe (30), the projection of the first end of the connecting pipe (30) is on the inner side wall of the first tapered pipe section. The end surface of the first end of the connecting pipe (30) is in abutment with the first tapered pipe section, and the first tapered pipe section forms the second stopper (21); or, The transition pipe (20) includes a second tapered pipe section. The outer diameter of the first tapered pipe section gradually decreases along the direction from the first end to the second end of the transition pipe (20). The first end of the connecting pipe (30) is sleeved on the second end of the transition pipe (20). Along the axial direction of the connecting pipe (30), the projection of the first end of the connecting pipe (30) is on the outer side wall of the second tapered pipe section. The end surface of the first end of the connecting pipe (30) is in abutment with the second tapered pipe section, and the second tapered pipe section forms the second stopper (21).

13. The stop valve according to claim 4, characterized in that A third stopper (31) is provided at the first end of the connecting pipe (30), and the third stopper (31) is located outside the second end of the transition pipe (20). The outer diameter of the third stopper (31) is greater than the inner diameter of the transition pipe (20), and the third stopper (31) cooperates with the second end stopper of the transition pipe (20).

14. The stop valve according to claim 13, characterized in that The connecting pipe (30) includes a third conical pipe section, and the inner diameter of the third conical pipe section gradually decreases along the direction from the first end to the second end of the connecting pipe (30). The second end of the transition pipe (20) is inserted into the first end of the connecting pipe (30). Along the axial direction of the connecting pipe (30), the projection of the second end of the transition pipe (20) is on the inner side wall of the third conical pipe section. The end surface of the second end of the transition pipe (20) is in abutment with the third conical pipe section, and the third conical pipe section forms the third stopper (31); or, The connecting pipe (30) includes a fourth conical pipe section. The outer diameter of the fourth conical pipe section gradually increases along the direction from the first end to the second end of the connecting pipe (30). The second end of the transition pipe (20) is sleeved on the first end of the connecting pipe (30). Along the axial direction of the connecting pipe (30), the projection of the transition pipe (20) is on the outer side wall of the fourth conical pipe section. The end surface of the second end of the transition pipe (20) is in abutment with the fourth conical pipe section, and the fourth conical pipe section forms the third stopper (31).

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