Valve assembly

Abstract

The present application provides a valve assembly, which includes a valve body, a valve stem and a fitting pipe portion; the valve body includes a first valve body portion and a second valve body portion; the valve body has a valve cavity, the first valve body portion has a first cavity, and the second valve body portion has a second cavity; the valve stem is at least partially located in the valve cavity; the valve body is provided with a valve port; the valve stem can move in the valve cavity to close or open the valve port so that the first cavity is separated from or communicated with the second cavity; the fitting pipe portion includes a main pipe body, a first pipe portion and a second pipe portion; the main pipe body is connected between the first pipe portion and the second pipe portion; the cavity of the main pipe body communicates with the cavities of the first pipe portion and the second pipe portion; both the first pipe portion and the second pipe portion include a reduced-diameter pipe portion; the first pipe portion further includes a first connecting pipe portion connected to the reduced-diameter pipe portion of the first pipe portion; the valve assembly further includes an adhesive layer located between the first connecting pipe portion and the first valve body portion. The present application is beneficial to reducing the number of welding positions of the valve assembly and simplifying the welding processing procedure.

Description

Technical Field

[0001] This application relates to the field of valve components in air conditioning systems, and particularly to a valve assembly. Background Art

[0002] During the operation of an air conditioning system, a stop valve can control the on-off of the refrigerant flow path. When the refrigerant flows in the pipeline system, pulsating noise will occur. Therefore, a silencer needs to be installed in the pipeline system to effectively reduce this pulsating noise. In related technologies, a connecting pipe for welding with other components is usually welded at both ends of the silencer, and a connecting pipe for welding with other components is also usually welded to the stop valve. The number of welding positions of the assembly formed by the silencer and the stop valve is relatively large, and the welding process is complex. Summary of the Invention

[0003] This application provides a valve assembly that is conducive to reducing the number of welding positions.

[0004] This application provides a valve assembly, including a valve body, a valve stem, and a fitting pipe portion;

[0005] The valve body includes a first valve body portion and a second valve body portion; the valve body has a valve cavity, the first valve body portion has a first cavity, and the second valve body portion has a second cavity; at least part of the valve stem is located in the valve cavity; the valve body is provided with a valve port; the valve stem can move in the valve cavity to close or open the valve port so that the first cavity is separated from or communicated with the second cavity;

[0006] The fitting pipe portion includes a main pipe body, a first pipe portion, and a second pipe portion; the main pipe body is connected between the first pipe portion and the second pipe portion, and the cavity of the main pipe body communicates with the cavity of the first pipe portion and the cavity of the second pipe portion; both the first pipe portion and the second pipe portion include a reduced-diameter pipe portion; the diameter of the side of the reduced-diameter pipe portion away from the main pipe body is smaller than the diameter of the side connected to the main pipe body; the first pipe portion further includes a first connecting pipe portion connected to the reduced-diameter pipe portion of the first pipe portion;

[0007] The valve assembly further includes an adhesive layer located between the first connecting pipe portion and the first valve body portion, and at least part of the area of the first connecting pipe portion and at least part of the area of the first valve body portion are in contact with the adhesive layer so that the valve body and the fitting pipe portion are adhesively fixed.

[0008] Since the valve assembly has an adhesive layer between the first connecting pipe portion and the first valve body portion, it is conducive to fixing the valve body and the fitting pipe portion by adhesive bonding, thus reducing the number of welding positions of the whole valve assembly and simplifying the welding process. Brief Description of the Drawings

[0009] Figure 1 Schematic perspective view of the valve assembly provided by the embodiment of the present application;

[0010] Figure 2 Schematic view of the valve body structure provided by the embodiment of the present application;

[0011] Figure 3 For the present application Figure 2 Schematic cross-sectional view of the components related to the valve body;

[0012] Figure 4 Schematic view of the structure of the mating pipe portion provided by the embodiment of the present application;

[0013] Figure 5 Schematic view of the connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application;

[0014] Figure 6 For the present application Figure 5 Enlarged view of a partial structure shown;

[0015] Figure 7 Enlarged view of another connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application;

[0016] Figure 8 Schematic view of the second connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application;

[0017] Figure 9 Schematic view of the third connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application;

[0018] Figure 10 Schematic view of the fourth connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application;

[0019] Figure 11 Schematic view of the fifth connection structure between a first sub-pipe portion and a first valve body portion provided by the embodiment of the present application. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] Referring to Figure 1 as shown, the embodiment of the present application provides a valve assembly 10, including a valve body 20, a valve stem 30 and a mating pipe portion 40.

[0022] The valve body 20 includes a first valve body portion 21 and a second valve body portion 22. The valve body 20 has a valve cavity 201. The first valve body portion 21 has a first cavity 210, and the second valve body portion 22 has a second cavity 220. The valve stem 30 is at least partially located in the valve cavity 201. The valve body 20 is provided with a valve port 202. The valve stem 30 can move within the valve cavity 201 to close or open the valve port 202, so that the first cavity 210 and the second cavity 220 are separated or communicated. In some embodiments, the valve body 20 and the valve stem 30 are conducive to realizing the related functions of a globe valve. The globe valve can be connected between the indoor unit and the outdoor unit in an air-conditioning system, playing a role in controlling the refrigerant flow path. An external thread can be provided on the valve stem 30, and an internal thread matching the external thread can be provided on the wall surface of the valve body 20 forming the valve cavity 201. In this way, the valve stem 30 can reciprocate within the valve cavity 201 under the action of the thread pair, so as to approach or move away from the valve port 202, in order to separate or communicate the first cavity 210 and the second cavity 220. To ensure the seal between the valve stem 30 and the valve body 20, a soft seal such as an elastic sealing ring can be provided between the two, and a valve cap that can be threadedly engaged with the valve body 20 can be added. A metal hard seal is formed between the valve cap and the valve body, which can further ensure the sealing performance of the globe valve.

[0023] Both the first valve body portion 21 and the second valve body portion 22 can have a central axis, and the two central axes can coincide, be parallel, be perpendicular, or have a certain included angle. In the embodiments provided in the present application, reference can be made to Figure 3 , that is, the central axis of the first valve body portion 21 is perpendicular to the central axis of the second valve body portion 22 for illustration.

[0024] For the valve body 20, it can further include a charging structure to facilitate filling the refrigerant into the system, such as Figure 2 and Figure 3 the right valve body part in, the charging structure is at least partially located in the cavity of the right valve body, and the charging structure can include components such as a valve core. Of course, the charging structure may not be provided on the valve body, and the present application does not limit this too much.

[0025] As Figure 4 shown, the fitting pipe portion 40 includes a main pipe body 41, a first pipe portion 42, and a second pipe portion 43. The main pipe body 41 is connected between the first pipe portion 42 and the second pipe portion 43. The cavity corresponding to the main pipe body 40 communicates with the cavity of the first pipe portion 42 and the cavity of the second pipe portion 43. Both the first pipe portion 42 and the second pipe portion 43 include a reduced-diameter pipe portion 440.

[0026] The mating pipe portion 40 can achieve the function of noise reduction. Since the pipe diameter P1 on the side of the reduced-diameter pipe portion 440 away from the main pipe body 41 is smaller than the pipe diameter P2 on the side connected to the main pipe body 41. When the fluid flows in the internal cavity of the mating pipe portion 40, this sudden change in the cross-section of the pipe is beneficial to using the change in acoustic impedance to reflect the sound source propagating along the pipe back towards the sound source direction to achieve the purpose of reducing noise. At the same time, the fluid enters the cavity of the main pipe body 41 through the cavity of the reduced-diameter pipe portion 440, and the cross-sectional area of the fluid inflow gradually becomes larger, the flow rate of the fluid is slow, and the pressure decreases. A buffer zone is formed in the cavity of the main pipe body 41, which is also beneficial to reducing noise.

[0027] The first pipe portion 42 further includes a first connecting pipe portion 421 connected to the reduced-diameter pipe portion 440 of the first pipe portion 42. The valve assembly 10 further includes an adhesive layer 50. The adhesive layer 50 is located between the first connecting pipe portion 421 and the first valve body portion 21. At least part of the area of the first connecting pipe portion 421 and at least part of the area of the first valve body portion 21 are in contact with the adhesive layer 50 so that the valve body 20 and the mating pipe portion 40 are adhesively fixed. The adhesive connection method is beneficial to reducing the number of welding positions between the first connecting pipe portion 421 and the first valve body portion 21. The first connecting pipe portion 421 can be integrally formed with the reduced-diameter pipe portion 440 as a whole, or a part of the pipe structure of the first connecting pipe portion 421 is integrally formed with the reduced-diameter pipe portion 440.

[0028] The second pipe portion 43 further includes a second connecting pipe portion 425 connected to the reduced-diameter pipe portion 440 of the second pipe portion 43. Refer to Figure 4 , a part of the second connecting pipe portion 425 is connected to the reduced-diameter pipe portion 440, a part extends into the cavity of the main pipe body 41, and another part is located outside the cavity of the main pipe body 41 and the cavity of the reduced-diameter pipe portion 440.

[0029] In an embodiment provided by the present application, the first connecting pipe portion 421 includes a first sub-pipe portion 422 and a second sub-pipe portion 423. The second sub-pipe portion 423 is integrally formed with the reduced-diameter pipe portion 440. The first sub-pipe portion 422 is welded or adhesively fixed to the second sub-pipe portion 423 as a whole. Specifically, the end of the first sub-pipe portion 422 is located in the cavity of the second sub-pipe portion 423, and the two form a sleeve structure. This is beneficial to simplifying the processing difficulty of the mating pipe portion 40 and reducing the manufacturing and processing complexity by splicing multiple pipe bodies.

[0030] The bonding layer 50 is located between the first sub-tube portion 422 and the first valve body portion 21. The valve body 20 has a blocking surface 211, and the end surface 4221 of the first sub-tube portion 422 away from the second sub-tube portion 423 is in contact with at least a partial area of the blocking surface 211. The blocking surface 211 can be located on the first valve body portion 21 or other parts of the valve body 20. The blocking surface 211 can limit the installation direction of the first sub-tube portion 422, making it convenient to position the first sub-tube portion 422 and apply glue, and improving the stability of bonding.

[0031] The first valve body portion 21 includes a first connection and mating portion 23 and a first stepped mating portion 24. The first connection and mating portion 23 is provided with a first channel 231. The first channel 231 is a part of the first cavity 210. At least a part of the first sub-tube portion 422 is located in the first channel 231. In the Figure 5 embodiment shown, a part of the first sub-tube portion 422 is located in the first cavity 210, and another part is located outside the first cavity 210.

[0032] The first sub-tube portion 422 has an inner surface 4221 and an outer peripheral surface 4222 that circumferentially surround its lumen. At least a partial area of the outer peripheral surface 4222 of the first sub-tube portion 422 is in contact with the bonding layer 50. The first connection and mating portion 23 has an annular inner wall surface 232 for forming the first channel 231. At least a partial area of the annular inner wall surface 232 is in contact with the bonding layer 50. There is a gap area for accommodating the bonding layer 50 between the outer peripheral surface 4222 of the first sub-tube portion 422 and the annular inner wall surface 232 of the first connection and mating portion 23. When applying glue, the glue can be coated on the outer peripheral surface 4222 of the end of the first sub-tube portion 422, or the glue can be coated on the annular inner wall surface 232 of the first connection and mating portion 23, or the glue is coated on both the outer peripheral surface 4222 of the end of the first sub-tube portion 422 and the annular inner wall surface 232 of the first connection and mating portion 23. The coated glue finally forms the bonding layer 50 after curing.

[0033] The first stepped mating portion 24 protrudes into the first cavity 210 more than the first connection and mating portion 23. The blocking surface 211 is located on the first stepped mating portion 24 and the blocking surface 211 is connected to the annular inner wall surface 232. In addition to the function of limiting the first sub-tube portion 422 through the blocking surface 211, the blocking surface 211 can also prevent the glue from overflowing and flowing into the first cavity 210, which is beneficial to improving the stability of the product. The glue is not easy to enter the first cavity 210, so it is not easy to contaminate the fluid and does not easily affect the precision control of other components in the system.

[0034] The first step fitting portion 24 is provided with a second channel 241. The first channel 231 and the second channel 241 together form a first cavity 210. The channel opening on the side of the second channel 241 away from the first channel 231 forms a valve port 202. The valve stem 30 can move relative to the valve port 202 along the axial direction of the second channel 241. When the valve stem 30 opens the valve port 202, the second channel 241 communicates the lumen of the first sub-tube portion 422 with the valve cavity 201.

[0035] Reference Figure 6 is an enlarged schematic view. The blocking surface 211 is arranged perpendicular to the axial direction of the second channel 241. The height by which the first step fitting portion 24 protrudes from the annular inner wall surface 232 of the first connection fitting portion 23 is greater than the thickness of the adhesive layer 50. The inner surface 4221 of the first sub-tube portion 422 can be slightly lower than the inner wall surface of the first step fitting portion 24 that forms the second channel 241 or flush with the inner wall surface of the first step fitting portion 24 that forms the second channel 241. Alternatively, as Figure 7 shown, the blocking surface 211 is arranged obliquely with respect to the axial direction of the second channel 241. In the case where the blocking surface 211 is inclined, it is beneficial to reduce the flow resistance of the fluid and provide the fluidity of the fluid.

[0036] Reference Figure 6 shown, the length L of the adhesive layer 50 in the axial direction of the second channel 241 is 1 mm to 10 mm. In some embodiments, the length L of the adhesive layer 50 in the axial direction of the second channel 241 can be 2.5 mm to 5 mm. The thickness D of the adhesive layer 50 is 0.05 mm to 1 mm. In some embodiments, the thickness D of the adhesive layer 50 is 0.15 mm to 0.35 mm. Ensuring the length and thickness of the adhesive layer 50 in the axial direction of the second channel 241 can improve the connection strength between the first sub-tube portion 422 and the first valve body portion 21. The material of the adhesive layer 50 can be a high-strength epoxy-based two-component structural adhesive or a high-strength epoxy-based one-component structural adhesive.

[0037] In other embodiments of the present application, the first sub-tube portion 422 has a first sub-cavity 4223 penetrating the tube body. The first valve body portion 21 includes a tubular fitting portion 25. The tubular fitting portion 25 has a third channel 251. The third channel 251 is at least a part of the first cavity 210. The valve body can also be provided with a second step fitting portion to cooperate with the tubular fitting portion 25, or the first sub-tube portion 422 can be limited by the surface structure of the valve body itself.

[0038] Reference Figure 8, the tubular fitting portion 25 is at least partially located in the first sub-cavity 4223. At least a partial area of the outer peripheral wall of the tubular fitting portion 25 is in contact with the adhesive layer 50. At least a partial area of the inner surface 4221 of the first sub-tube portion 422 that circumferentially surrounds the first sub-cavity 4223 is in contact with the adhesive layer 50. The blocking surface 211 is located on the valve body 20, and the blocking surface 211 is connected to the outer peripheral wall of the tubular fitting portion 25.

[0039] To prevent the colloid from overflowing into the first sub-cavity 4223 of the first sub-tube portion 422 and the third channel 251, the tubular fitting portion 25 may be provided with a receiving groove 254. The opening of the receiving groove 254 is arranged facing the inner surface 4221 of the first sub-tube portion 422. At least a part of the adhesive layer 50 is located in the receiving groove 254. The receiving groove 254 may have an opening only at the top, and the first sub-tube portion 422 blocks the opening of the receiving groove 254. To ensure the application thickness of the glue, the depth of the receiving groove 254 is 0.05 mm to 1 mm. In some embodiments, the depth of the receiving groove 254 is 0.15 mm to 0.35 mm. That is, the thickness of the colloid is ensured by the depth of the receiving groove 254 to meet the requirements of glue application. The first sub-tube portion 422 provides overflow protection for the colloid through the side wall connected to the bottom of the receiving groove 254, so that the colloid is not easily leaked into the third channel 251. The length of the receiving groove 254 in the axial direction of the third channel 251 is 1 mm to 10 mm. This is beneficial to ensuring the glue application area and thus beneficial to the connection strength between components. In some embodiments, the length of the receiving groove 254 in the axial direction of the third channel 251 may be 2.5 mm to 5 mm. The material of the adhesive layer 50 is a high-strength epoxy-based two-component structural adhesive or a high-strength epoxy-based one-component structural adhesive.

[0040] As Figure 9 shown, in other embodiments, a plurality of recesses 255 are provided on the side of the tubular fitting portion 25 away from the third channel 251. A convex portion 256 is formed between two adjacent recesses 255. The opening of the recess 255 is arranged facing the inner surface 4221 of the first sub-tube portion 422. Two adjacent recesses 255 are separated by the convex portion 256. The plurality of recesses 255 and the plurality of convex portions 256 cause at least a partial area on the side of the tubular fitting portion 25 away from the third channel 251 to form an uneven tenon and mortise surface. This tenon and mortise surface can be provided on Figure 8 the bottom of the receiving groove 254, or can be directly provided on the surface of the side of the tubular fitting portion 25 away from the third channel 251. This tenon and mortise surface is beneficial for the adhesive layer 50 to improve the connection strength between the tubular fitting portion 25 and the first sub-tube portion 422, and can play a role in preventing glue overflow to a certain extent.

[0041] Between the first connecting pipe portion 421 and the first valve body portion 21, in addition to the bonding and fixing method through the bonding layer 50 in the direction of the central axis of the first valve body portion 21. In other embodiments, the first sub-pipe portion 422 has a first sub-cavity 4223 penetrating through its pipe body, and the first valve body portion 21 includes a tubular fitting portion 25. The tubular fitting portion 25 has a third channel 251, and the third channel 251 is at least a part of the first cavity 210. The third channel 251 communicates with the first sub-cavity 4223. As Figure 10 shown, the first connecting pipe portion 421 can also be bonded and fixed to the first valve body portion 21 in a direction perpendicular to the central axis of the first valve body portion 21 through the bonding layer 50, that is, the bonding layer 50 is located between the end face 4225 of the free end of the first connecting pipe portion 421 and the first valve body portion 21. The free end of the first connecting pipe portion 421 can form a flanging 4224 facing away from the direction of the first sub-cavity 4223, and the end face 4225 is formed on the side of the flanging 4224 facing the first valve body portion 21. The end face 4225 can be perpendicular to the axial direction of the third channel 251. To prevent glue overflow, the first connecting pipe portion 421 can also be provided with a protrusion, for example, on the side of the bonding layer 50 close to the central axis of the third channel 251, or the first valve body portion 21 is provided with a protrusion on the side of the bonding layer 50 close to the central axis of the third channel 251, etc.

[0042] In other embodiments, referring to Figure 11 shown, the first sub-pipe portion 422 has a first sub-cavity 4223 penetrating through its pipe body, and the first valve body portion 21 includes a tubular fitting portion 25. The tubular fitting portion 25 has a third channel 251, and the third channel 251 is at least a part of the first cavity 210. The third channel 251 communicates with the first sub-cavity 4223. The first valve body portion 21 can be provided with a groove 252, and the groove 252 is located on the outer periphery of the third channel 251. The first sub-pipe portion 422 has a receiving fitting portion 4226 that cooperates with the groove 252. The receiving fitting portion 4226 can be received in the groove 252, and at least a part of the bonding layer 50 is also received in the groove 252. The bonding layer 50 is located between the receiving fitting portion 4226 and the groove wall of the groove 252. Specifically, the surface of the receiving fitting portion 4226 can be coated with a colloid and then inserted between the grooves 252. The receiving fitting portion 4226 and the groove wall of the groove 252 are both in contact with the bonding layer 50, so as to realize the bonding and fixing between the two components through the bonding layer 50.

[0043] The material of the first sub-pipe portion 422 includes one or more of iron, copper alloy, and aluminum alloy. The material of the first sub-pipe portion 422 can also be non-metal. In this way, when the material of the valve body 20 is different from the material of the pipe body part such as the main pipe body 41 that realizes the sound absorption function, the difficulty of welding different metal materials is reduced, and the electrochemical corrosion problem of welding different types of metals is reduced.

[0044] In addition, in the embodiments of the present application, the first sub-tube portion 422 can be an integrally extended complete connecting tube, which reduces the number of connecting tube components when the stop valve is connected to the muffler in the related art and is conducive to realizing an integrated design. Of course, in some embodiments, the length of the first sub-tube portion 422 can be reduced or even the first sub-tube portion 422 can be eliminated. In this way, the distance between the necking tube portion 440 of the muffler and the valve body 20 of the stop valve is closer, which is conducive to reducing the space occupied by the system. Using the adhesive layer 50 to fix the first connecting tube portion 421 and the first valve body portion 21 is conducive to reducing the number of welding positions in the entire air-conditioning system, thereby simplifying the welding process. Using the adhesive layer 50 to seal the connecting part is simple to manufacture, has a good sealing effect, and reduces the potential risk of electrochemical corrosion caused by different types of metals.

[0045] In the related art, both the muffler and the stop valve are welded with a connecting tube. Another connecting tube needs to be welded between the connecting tube of the muffler and the connecting tube of the stop valve to connect the two components. This results in a large number of welding points and complex processing procedures in the air-conditioning system. In order to reduce the number of welding points, if the connecting tube of the muffler is eliminated and the connecting tube of the stop valve is directly welded to the muffler, since the material of the muffler is generally iron and the material of the connecting tube is generally copper, and the two are dissimilar metals. To reduce the problem of easy corrosion of iron, the surface of the muffler and the position welded to the connecting tube need to be spray-coated at high temperature to add a corrosion-resistant protective coating. The high temperature of the spraying process will affect the sealing effect of the sealing element in the stop valve. If the connecting tube of the stop valve is eliminated and the connecting tube of the muffler is directly welded to the stop valve, since the stop valve needs to be cleaned with a brazing flux after being welded to the connecting tube and the inner wall of the muffler cannot be wetted with water, there will be a hidden danger of rust. Therefore, there are many problems in the related art when using the welding connection method. In the valve assembly of the present application, there is an adhesive layer between the first connecting tube portion 421 and the first valve body portion 21. This is conducive to fixing the valve body 20 and the mating tube portion 40 by bonding. The connection between the two can be achieved by leaving a certain curing time after applying the glue, which greatly reduces the solder joints and processes of the original brazing process, is conducive to improving the production efficiency of the product, and saves the number of connecting tubes and costs.

[0046] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A valve assembly (10) comprising a valve body (20), a valve stem (30) and a mating pipe portion (40); The valve body (20) includes a first valve body portion (21) and a second valve body portion (22); the valve body (20) has a valve cavity (201), the first valve body portion (21) has a first cavity (210), and the second valve body portion (22) has a second cavity (220); the valve stem (30) is at least partially located in the valve cavity (201); the valve body (20) is provided with a valve port (202); the valve stem (30) can move in the valve cavity (201) to close or open the valve port (202) so that the first cavity (210) is separated from or communicated with the second cavity (220); The mating pipe portion (40) includes a main pipe body (41), a first pipe portion (42) and a second pipe portion (43); the main pipe body (41) is connected between the first pipe portion (42) and the second pipe portion (43), and the cavity of the main pipe body (41) communicates with the cavities of the first pipe portion (42) and the second pipe portion (43); both the first pipe portion (42) and the second pipe portion (43) include a reduced-diameter pipe portion (440); the diameter (P1) of the side of the reduced-diameter pipe portion (440) away from the main pipe body (41) is smaller than the diameter (P2) of the side connected to the main pipe body (41); the first pipe portion (42) further includes a first connecting pipe portion (421), and the first connecting pipe portion (421) is connected to the reduced-diameter pipe portion (440); The valve assembly (10) further includes an adhesive layer (50), the adhesive layer (50) is located between the first connecting pipe portion (421) and the first valve body portion (21), and at least partial regions of both the first connecting pipe portion (421) and the first valve body portion (21) are in contact with the adhesive layer (50) so that the valve body (20) and the mating pipe portion (40) are adhesively fixed.

2. The valve assembly (10) according to claim 1, characterized in that, The first connecting pipe portion (421) includes a first sub-pipe portion (422) and a second sub-pipe portion (423); the second sub-pipe portion (423) is integrally formed with the reduced-diameter pipe portion (440), and the first sub-pipe portion (422) is fixedly welded or adhesively fixed to the second sub-pipe portion (423); the adhesive layer (50) is located between the first sub-pipe portion (422) and the first valve body portion (21); The valve body (20) has a blocking surface (211), and the end face of the first sub-pipe portion (422) away from the second sub-pipe portion (423) is in contact with at least partial regions of the blocking surface (211).

3. The valve assembly (10) according to claim 2, characterized in that, The first valve body portion includes a first connection and mating portion (23) and a first stepped mating portion (24); the first connection and mating portion (23) is provided with a first channel (231), and the first channel (231) is a part of the first cavity (210); The first sub-tube portion (422) is at least partially located in the first channel (231); at least a partial area of the outer peripheral surface (4222) of the first sub-tube portion (422) is in contact with the bonding layer (50); the first connection and mating portion (23) has an annular inner wall surface (232) for forming the first channel (231), and at least a partial area of the annular inner wall surface (232) is in contact with the bonding layer (50); the first step mating portion (24) protrudes into the first cavity (210) more than the first connection and mating portion (23), the blocking surface (211) is located on the first step mating portion (24) and the blocking surface (211) is connected to the annular inner wall surface (232).

4. The valve assembly (10) according to claim 3, characterized in that, The first step mating portion (24) is provided with a second channel (241), and the first channel (231) and the second channel (241) together form the first cavity (210); the channel opening on the side of the second channel (241) away from the first channel (231) forms the valve port (202); the valve stem (30) can move relative to the valve port (202) along the axial direction of the second channel (241); when the valve stem (30) opens the valve port (202), the second channel (241) connects the lumen of the first sub-tube portion (422) with the valve cavity (201).

5. The valve assembly (10) according to claim 4, characterized in that, The blocking surface (211) is perpendicular to the axial direction of the second channel (241), or the blocking surface (211) is inclined with respect to the axial direction of the second channel (241).

6. The valve assembly (10) according to claim 4, characterized in that, The length of the bonding layer (50) in the axial direction of the second channel (241) is 1 mm to 10 mm, and the thickness of the bonding layer (50) is 0.05 mm to 1 mm; the material of the bonding layer (50) is an epoxy-based two-component structural adhesive or an epoxy-based one-component structural adhesive.

7. The valve assembly (10) according to claim 2, characterized in that, The first sub-tube portion (422) has a first sub-cavity (4223) penetrating through its tube body; the first valve body portion (21) includes a tubular mating portion (25); the tubular mating portion (25) has a third channel (251), and the third channel (251) is at least a part of the first cavity (210); the tubular mating portion (25) is at least partially located in the first sub-cavity (4223); at least a partial area of the tubular mating portion (25) is in contact with the bonding layer (50); at least a partial area of the inner surface (4221) of the first sub-tube portion (422) circumferentially surrounding its lumen is in contact with the bonding layer (50).

8. The valve assembly (10) according to claim 7, characterized in that, The tubular fitting portion (25) is provided with a receiving groove (254), and the opening of the receiving groove (254) faces the inner surface (4221) of the first sub-tube portion (422); at least a part of the bonding layer (50) is located in the receiving groove (254), and the first sub-tube portion (422) closes the opening of the receiving groove (254); the depth of the receiving groove (254) is 0.05 mm to 1 mm; the length of the receiving groove (254) in the axial direction of the third channel (251) is 1 mm to 10 mm; the material of the bonding layer (50) is an epoxy-based two-component structural adhesive or an epoxy-based one-component structural adhesive.

9. The valve assembly (10) according to claim 7, wherein, On one side of the tubular fitting portion (25) away from the third channel (251), a plurality of recesses (255) are provided, and the openings of the recesses (255) face the inner surface (4221) of the first sub-tube portion (422), and a convex portion (256) is formed between two adjacent recesses (255); the plurality of recesses (255) and the plurality of convex portions (256) make at least a partial area on one side of the tubular fitting portion (25) away from the third channel (251) form an uneven tenon and mortise surface.

10. The valve assembly (10) according to claim 2, characterized in that, The first sub-tube portion (422) has a first sub-cavity (4223) penetrating through its tube body; the first valve body portion (21) includes a tubular fitting portion (25); the tubular fitting portion (25) has a third channel (251), and the third channel (251) is at least a part of the first cavity (210). The first sub-tube portion (422) is provided with an outward flange (4224) facing away from the first sub-cavity (4223), and at least a part of the end face (4225) of the outward flange (4224) opposite to the first valve body portion (21) is in contact with the bonding layer (50); at least a part of the tubular fitting portion (25) is in contact with the bonding layer (50). Alternatively, the tubular fitting portion (25) is provided with a groove (252), the groove (252) is located on the periphery of the third channel (251), the first sub-tube portion (422) has a receiving and fitting portion (4226), the receiving and fitting portion (4226) is received in the groove (252), at least a part of the bonding layer (50) is also received in the groove (252), at least a part of the receiving and fitting portion (4226) is in contact with the bonding layer (50), and at least a part of the groove wall of the groove (252) is in contact with the bonding layer (50). The material of the first sub-tube portion (422) includes one or more of iron, copper alloy, and aluminum alloy.

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