Valve body welding system and valve body welding method

Abstract

The present invention relates to the field of refrigeration systems, and in particular to a valve body and a valve body welding system thereof. A valve body welding method is provided for welding a valve body to an external pipeline, wherein the valve body comprises a main valve and a sleeve, the sleeve being connected to the main valve, and the external pipeline having a welding portion, and is characterized in that the method comprises the following steps: S1: sleeve the sleeve onto the outside of the external pipeline; S2: contact the coolant at a first position of the sleeve, wherein the distance between the first position and the end face of the sleeve facing the main valve is a first preset distance; S3: weld the sleeve to the external pipeline at the welding portion, and the solder solidifies on the inner wall of the sleeve. The advantage of this method is that the thermal conductivity of the sleeve is closer to that of the external pipeline, the temperature difference is smaller, the solder will solidify on the inner wall of the sleeve, and will not continue to flow downward, thereby preventing the solder from contacting the lower temperature main valve and rapidly solidifying, causing welding slag to fall into the interior of the main valve.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration systems, and in particular to a valve body welding system and a valve body welding method. Background Art

[0002] In the refrigeration system, the valve body plays an important role in controlling the on-off, flow direction and flow rate of the medium in the pipeline. The valve body is an indispensable part of the refrigeration system. The valve body welding system can weld the valve body and the external pipeline.

[0003] During installation, existing valve bodies inevitably need to be connected to external piping, and this connection is typically achieved by welding. When solder flows from the external piping into the valve body and ultimately contacts it, the temperature of the valve body is much lower than that of the external piping. Instead of remaining on the inner surface of the valve body and slowly solidifying, the solder rapidly solidifies, transforming from liquid to solid, forming slag that falls into the valve body, causing excessive internal leakage and non-reversal. This problem is particularly severe when the valve body and external piping are made of different materials, with significantly different thermal conductivities. Summary of the Invention

[0004] Based on this, the present invention provides a valve body welding method to solve the above technical problems. The technical solution is as follows:

[0005] A valve body welding method is used to weld a valve body to an external pipeline, wherein the valve body includes a main valve and a sleeve, the sleeve is connected to the main valve, and the external pipeline has a welding portion, and is characterized by comprising the following steps:

[0006] S1: Sleeve the sleeve onto the external pipeline;

[0007] S2: contacting the first position of the sleeve with the coolant, wherein the distance between the first position and the end surface of the sleeve facing the main valve is a first preset distance;

[0008] S3: Welding the sleeve to the external pipeline at the welding position, and solidifying the solder on the inner wall of the sleeve.

[0009] This arrangement places a sleeve between the main valve and external piping, which have significantly different thermal conductivities. Because the sleeve's thermal conductivity is greater than that of the main valve, its thermal conductivity is closer to that of the external piping. During welding, the temperature difference between the sleeve and external piping is smaller, preventing the solder from rapidly solidifying due to encountering extremely cold materials and falling into the main valve. Furthermore, because the outside of the sleeve is in contact with the coolant, the solder solidifies on the sleeve's inner wall when it cools, preventing it from flowing downward and preventing slag from falling into the main valve.

[0010] In one embodiment, in step S2, the first preset distance is 0 mm-5 mm.

[0011] This setting allows the coolant to be located 0mm-5mm in the direction of the sleeve toward the external pipeline. In this area, the coolant can play a role in lowering the sleeve temperature and causing the solder to condense. At the same time, it provides a larger setting range for the coolant position, reducing the difficulty of setting the coolant during installation, improving the efficiency of processing and production, and allowing the solder to solidify at the appropriate position. If it is too close to the main valve, welding slag will fall into the main valve. If the position is too close to the welding part, it will affect the welding temperature during welding and affect the welding quality.

[0012] In one embodiment, in step S2, the main valve and the sleeve are immersed in the coolant, and the liquid level of the coolant is flush with the first position; or, the coolant is sprayed toward the sleeve at the first position.

[0013] This arrangement provides multiple ways for the sleeve to contact the coolant. Immersing the main valve and sleeve in the coolant allows them to contact more coolant, thereby improving the cooling effect. Spraying the coolant directly onto the sleeve makes the operation more convenient and quick, while also saving the amount of coolant used.

[0014] In one embodiment, in step S3, the welding portion is located on a side of the end face of the sleeve away from the main valve, and a distance H between the welding portion and the end face of the sleeve is 2 mm to 30 mm.

[0015] Such an arrangement enables the sleeve and the external pipeline to be welded smoothly. If the welding part is too close to the sleeve, it will be inconvenient for welding. If it is too far away from the sleeve, the solder will not be able to flow to the connection between the sleeve and the external pipeline.

[0016] In one embodiment, in step S3, the welding portion is welded using a welding gun, the welding gun is oriented away from the sleeve, and the angle between the welding gun and the welding portion is 1°-45°.

[0017] This arrangement makes the temperature impact direction of the welding gun away from the sleeve, avoiding the rapid temperature rise of the sleeve due to the welding action, resulting in the solder not solidifying at the sleeve and still flowing to the main valve. Due to the extremely low temperature of the main valve, it quickly solidifies at the main valve and falls into the inside of the main valve.

[0018] In one embodiment, in step S3, the welding portion is located on the other side of the end face of the sleeve away from the external pipeline, and the distance h between the welding portion and the other side of the sleeve end face is 2 mm-30 mm.

[0019] In one embodiment, in step S3, the welding parts are welded using a high-frequency welding ring.

[0020] With this arrangement, since the temperature-affected area of ​​the high-frequency welding ring is smaller, the high-temperature area during welding can be controlled more accurately. Even if the high-frequency welding ring is inserted into the sleeve for welding, the problem of the solder not being able to solidify inside the sleeve due to the temperature increase of the entire sleeve can still be avoided.

[0021] In one embodiment, in step S1 , the external pipe is in contact with the sleeve; the external pipe is gap-fitted with the inner wall of the sleeve to allow solder to flow.

[0022] This arrangement allows the solder to flow through the gap between the external pipeline and the sleeve, thereby enhancing the welding strength.

[0023] The present invention also provides the following technical solutions:

[0024] A valve body welding system includes a coolant and a valve body. The valve body is welded to an external pipeline using the valve body welding method described above. The valve body includes a main valve, a sleeve, and an external pipeline. The sleeve is connected to the main valve, and the external pipeline is connected to the sleeve. The inner wall of the sleeve is provided with a protrusion, and at least part of the inner diameter of the protrusion is smaller than the outer diameter of the external pipeline. The outer wall of the sleeve is in contact with the coolant.

[0025] Such a setting extends the flow path of the solder on the inner wall of the sleeve, and at the same time makes the path no longer vertically downward, which prevents the solder from falling directly into the main valve without cooling, and also extends the time for the solder to flow on the inner wall of the sleeve, that is, extends the cooling time, makes the solder solidify more thoroughly, and further prevents welding slag from falling into the main valve.

[0026] In one embodiment, the side of the protrusion away from the main valve is a first step, which abuts against the external pipeline, and the side of the protrusion close to the main valve is a second step, which abuts against the main valve.

[0027] Compared to existing technologies, the valve body welding method provided by the present invention employs a sleeve placed between the main valve and external piping, which have significantly different thermal conductivity coefficients. Because the sleeve's thermal conductivity is greater than that of the main valve, its thermal conductivity is closer to that of the external piping. During the welding process, the temperature difference between the sleeve and the external piping is smaller, preventing the solder from rapidly solidifying due to encountering extremely cold materials and falling into the main valve. Furthermore, because the exterior of the sleeve is in contact with the coolant, the solder solidifies on the sleeve's inner wall and does not continue to flow downward, preventing welding slag from falling into the main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A cross-sectional view of the valve body welding system provided by the present invention;

[0029] Figure 2 A three-dimensional diagram of the valve body welding system provided by the present invention;

[0030] Figure 3 A cross-sectional view of another embodiment of the valve body welding system provided by the present invention.

[0031] The symbols in the figure mean the following:

[0032] 100. Valve body welding system; 10. Main valve; 20. Casing; 21. Protrusion; 211. First step; 212. Second step; 22. First position; 30. External piping; 31. Welding part. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0038] See Figure 1-2 The present invention provides a valve body welding system 100 that can weld an external pipeline 30 to a valve body.

[0039] In this embodiment, the valve body welding system 100 includes a four-way valve, a coolant, and external piping. In other embodiments, the valve body can also be configured as a three-way valve, a five-way valve, a stop valve, a throttle valve, etc., rather than being limited to the four-way valve described in this embodiment. The coolant contacts the valve body, thereby cooling it during the welding process.

[0040] The valve body includes a main valve 10 and a sleeve 20, which is connected to the main valve 10. The sleeve 20 is connected to the main valve 10, and the external pipeline 30 is connected to the sleeve 20. The inner wall of the sleeve 20 is provided with a protrusion 21. At least part of the inner diameter of the protrusion 21 is smaller than the outer diameter of the external pipeline 30, and the outer wall of the sleeve is in contact with the coolant. This arrangement ensures the axial length of the protrusion 21, allowing the solder to remain on the protrusion 21 for a sufficient period of time to solidify there. This prevents the solder from flowing to the main valve 10 before solidifying on the protrusion 21, and then rapidly solidifying on contact with the cooler main valve 10, forming welding slag that falls into the interior of the main valve 10.

[0041] Furthermore, the thermal conductivity of the main valve 10 is smaller than that of the sleeve 20. The inner wall of the sleeve 20 is provided with a protrusion 21, which can retain solder, and the axial length of the protrusion 21 along the sleeve 20 is 5mm-25mm.

[0042] The protrusion 21 is formed on the outer wall of the sleeve 20 by press working.

[0043] Specifically, the side of the protrusion 21 away from the main valve 10 is a first step 211 that abuts against the external pipeline 30 , and the side of the protrusion 21 close to the main valve 10 is a second step 212 that abuts against the main valve 10 .

[0044] In this embodiment, the first step 211 and the second step 212 are both inclined surfaces, which can have a slight interference fit with the external pipeline 30 and the main valve 10, thereby making the connection between the three tighter and preventing solder leakage.

[0045] In other embodiments, the first step 211 and the second step 212 may also be flat surfaces to increase the contact area with the external pipeline 30 and the main valve 10. The configuration of the first step 211 and the second step 212 is not limited to the inclined surfaces of this embodiment, as long as they can achieve connection between the three and prevent solder leakage.

[0046] Furthermore, the angle between the inclined surface and the axis of the sleeve 20 is 15°-30. Within this angle range, the inclined surface is in closest contact with the sleeve 20 and the external pipe 30, and can also prevent the protrusion 21 from causing the inner diameter of the sleeve 20 to be too small to cause throttling.

[0047] The axial length of the sleeve 20 is 18mm-60mm, thereby ensuring the connection length between the sleeve 20 and the main valve 10 and the external pipeline 30, improving the connection stability, and being adaptable to more types of main valves 10 and a wider range of applicable working environments.

[0048] The diameters of both ends of the sleeve 20 are the same, which reduces the flow resistance of the medium, and the wall thickness of the sleeve 20 is equal along the axial direction of the sleeve 20, thereby reducing the difficulty and cost of processing and improving the integrity, coaxiality and consistency of the sleeve 20.

[0049] In this embodiment, the main valve 10 is made of stainless steel, and the sleeve 20 is made of copper. Due to the low cost and high hardness of stainless steel, using stainless steel for the main valve 10 improves the durability and stability of the finished product, reducing product costs. Since the external piping 30 is often made of copper, using copper for the sleeve 20 can bring the thermal conductivity of the sleeve 20 closer to that of the external piping 30, minimizing the temperature difference between the two. This prevents the solder from solidifying rapidly due to the lower temperature of the sleeve 20, preventing it from remaining at the protrusion 21 and instead falling into the main valve 10.

[0050] The external pipeline 30 and the sleeve 20 are clearance-fitted, that is, the portion of the protrusion 21 located between the first step 211 and the second step 212 is a straight pipe section parallel to the axis of the sleeve 20, and the diameter of the straight pipe section is smaller than the outer diameter of the external pipeline 30, so that the solder can flow from the gap between the external pipeline 30 and the sleeve 20, and then flow into the sleeve 20, achieving condensation on the inner wall of the sleeve 20, thereby enhancing the strength of the welding.

[0051] In addition, the valve body welding system further includes a water tank or a spray gun, wherein the water tank is filled with coolant, the valve body is immersed in the coolant, and the coolant level is located at a first position. A large amount of coolant can ensure a cooling effect. In another embodiment, the spray gun sprays the coolant toward the first position, making operation and processing more convenient and faster.

[0052] The present invention also provides a valve body welding method for solving the technical problem that due to the large difference in thermal conductivity between the valve body and the external pipeline 30 and the low temperature of the valve body, the solder is easily solidified into welding slag due to rapid solidification, and falls into the interior of the valve body to affect the performance of the valve body.

[0053] In this embodiment, the above method is applied to welding a four-way valve to an external pipeline 30. In other embodiments, the above method can also be applied to three-way valves, five-way valves, stop valves and throttle valves, etc., and is not limited to the four-way valve described in this embodiment.

[0054] The above methods include:

[0055] S1: Sleeve the sleeve 20 onto the external pipe 30;

[0056] S2: The first position 22 of the sleeve 20 is brought into contact with the coolant, wherein the distance between the first position 22 and the end surface of the sleeve 20 facing the main valve 10 is a first preset distance;

[0057] S3: Welding the sleeve 20 and the external pipeline 30 at the welding position, and the solder solidifies on the inner wall of the sleeve 20.

[0058] By placing the sleeve 20 between the main valve 10 and the external pipeline 30, which have significantly different thermal conductivities, the sleeve 20 has a greater thermal conductivity than the main valve 10, resulting in a closer thermal conductivity to the external pipeline 30. During the welding process, the temperature difference between the sleeve 20 and the external pipeline 30 is smaller, thus preventing the solder from rapidly solidifying due to encountering extremely cold materials and falling into the main valve 10. Furthermore, because the exterior of the sleeve 20 is in contact with the coolant, the solder solidifies on the inner wall of the sleeve 20 and does not continue to flow downward, preventing welding slag from falling into the main valve 10.

[0059] Specifically, in step S1 , the external pipe 30 and the sleeve 20 are gap-fitted, so that the solder flows into the gap therebetween. Since the sleeve 20 is cooled by the coolant and the temperature is low, the solder solidifies inside the sleeve 20 .

[0060] In step S2, the first preset distance is 0mm-5mm. In this area, the coolant can play a role in lowering the temperature of the sleeve 20 and causing the solder to coagulate. At the same time, it provides a larger setting range for the position of the coolant, reduces the difficulty of setting the coolant during processing, improves the efficiency of processing and production, and allows the solder to solidify at a suitable position. If it is too close to the main valve 10, welding slag will fall into the main valve 10. If the position is too close to the welding part 31, it will affect the welding temperature during welding and affect the welding quality.

[0061] It can be understood that when the first preset distance is 0 mm, the coolant just contacts the end face of the sleeve 20 facing the main valve 10. When the temperature of the sleeve 20 rises due to the welding action, the coolant in contact with the end face of the sleeve 20 facing the main valve 10 can absorb heat, thereby reducing the temperature of the sleeve 20, so that the solder can solidify during the flow process on the inner wall of the sleeve 20.

[0062] The welding portion 31 is located on the side of the sleeve 20 away from the end face of the main valve 10, and the distance H from the sleeve 20 is 2mm-30mm, so that the sleeve 20 and the external pipeline 30 can be welded smoothly. If the welding portion 31 is too close to the sleeve, the welding action will be inconvenient. If the welding portion 31 is too far away from the sleeve, the solder will not be able to flow to the connection between the sleeve 20 and the external pipeline 30.

[0063] In step S3, the sleeve 20 and the external pipeline 30 are welded together at the welding position 31 using a welding gun. The welding gun is directed away from the sleeve 20, and the angle between the welding gun and the welding position 31 is 1°-45°, so that the temperature impact direction of the welding gun is away from the sleeve 20, thereby avoiding a rapid temperature rise of the sleeve 20 due to the welding action, resulting in the solder not solidifying at the sleeve 20 and still flowing to the main valve 10. Since the temperature of the main valve 10 is extremely low, the solder quickly solidifies at the main valve 10 and falls into the inside of the main valve 10.

[0064] Further, see Figure 3 In another embodiment, in step S3, the welding portion 31 is located on the other side of the end face of the sleeve 20 away from the external pipe 30, and the distance h between the other side of the end face of the sleeve 20 and the other side is 2 mm to 30 mm. In this case, the welding portion 31 is welded using a high-frequency welding ring.

[0065] Specifically, during the welding process, the high-frequency welding ring extends into the interior of the sleeve 20 and increases the temperature at the welding position 31. At this time, the solder is placed at the end of the sleeve 20 away from the main valve 10. When the temperature of the sleeve 20 increases, the solder melts and flows along the gap between the sleeve 20 and the external pipeline 30 toward the main valve, and finally solidifies on the inner wall of the sleeve 20.

[0066] Since the temperature affected area of ​​the high-frequency welding ring is small, the high-temperature area during welding can be controlled more accurately. Even if the high-frequency welding ring is inserted into the sleeve 20 for welding, the problem of the temperature of the entire sleeve 20 rising and the solder not being able to solidify inside the sleeve 20 can still be avoided.

[0067] In this embodiment, the main valve 10 and the sleeve 20 are immersed in the coolant, and the liquid level of the coolant is flush with the first position 22, so that they can be in contact with more coolant, thereby improving the cooling effect.

[0068] In another embodiment, the coolant is sprayed toward the sleeve 20 at the first position 22, which makes the operation more convenient and faster, improves the production efficiency, and also saves the amount of coolant used.

[0069] In this embodiment, the coolant is water. Due to its high specific heat capacity, water provides a good cooling effect on the sleeve 20. Furthermore, due to its low price, it also reduces costs. It is understood that in other embodiments, other coolants may be selected based on a comprehensive consideration of factors such as cooling efficiency, cost, and operating environment. The coolant is not limited to water in this embodiment.

[0070] Compared to the prior art, the present invention installs a sleeve 20 between the main valve 10 and the external pipeline 30, which have significantly different thermal conductivity coefficients. Because the thermal conductivity of the sleeve 20 is greater than that of the main valve 10, the thermal conductivity of the sleeve 20 is closer to that of the external pipeline 30. During the welding process, the temperature difference between the sleeve 20 and the external pipeline 30 is smaller, preventing the solder from rapidly solidifying due to encountering extremely low temperature materials and falling into the main valve 10. Furthermore, because the exterior of the sleeve 20 is in contact with the coolant, the solder solidifies on the inner wall of the sleeve 20 and does not continue to flow downward, preventing welding slag from falling into the main valve 10.

[0071] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A valve body welding method for welding a valve body to an external pipeline (30), wherein the valve body comprises a main valve (10) and a sleeve (20), the sleeve (20) being connected to the main valve (10), and the external pipeline having a welding portion (31), characterized in that: The following steps are involved: S1: Sleeve the sleeve (20) onto the outside of the external pipeline (30); S2: contacting the first position (22) of the sleeve (20) with the coolant, wherein the distance between the first position (22) and the end surface of the sleeve (20) facing the main valve (10) is a first preset distance; S3: Welding the sleeve (20) and the external pipeline (30) at the welding position (31), and solidifying the solder on the inner wall of the sleeve (20). In step S3, the welding portion (31) is located on the side of the end face of the sleeve (20) away from the main valve (10), and the distance H between the welding portion (31) and the end face of the sleeve (20) is 2 mm to 30 mm; In step S2, the first preset distance is 0 mm to 5 mm, the main valve (10) and the sleeve (20) are immersed in the coolant, and the liquid level of the coolant is flush with the first position (22); or, the coolant is sprayed toward the sleeve (20) at the first position (22).

2. The valve body welding method according to claim 1, characterized in that: In step S3, the welding portion (31) is welded using a welding gun, the welding gun is oriented away from the sleeve (20), and the angle between the welding gun and the welding portion (31) is 1°-45°.

3. The valve body welding method according to claim 1, characterized in that: In step S3, the welding portion (31) is welded using a high-frequency welding ring.

4. The valve body welding method according to claim 1, characterized in that: In step S1, the external pipeline (30) is in contact with the sleeve (20); the external pipeline (30) is gap-matched with the inner wall of the sleeve (20) to allow solder to flow.

5. A valve body welding system, characterized in that: The invention comprises a coolant and a valve body, wherein the valve body is welded to an external pipeline (30) by the valve body welding method according to any one of claims 1 to 4, wherein the valve body comprises a main valve (10), a sleeve (20) and an external pipeline (30), wherein the sleeve (20) is connected to the main valve (10), and the external pipeline (30) is connected to the sleeve (20), and the inner wall of the sleeve (20) is provided with a protrusion (21), wherein at least a part of the inner diameter of the protrusion (21) is smaller than the outer diameter of the external pipeline (30), and the outer wall of the sleeve (20) is in contact with the coolant.

6. The valve body welding system according to claim 5, characterized in that: The side of the protrusion (21) away from the main valve (10) is a first step (211), and the first step (211) abuts against the external pipeline (30). The side of the protrusion (21) close to the main valve (10) is a second step (212), and the second step (212) abuts against the main valve (10).

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