Valve seat assembly and valve device

Abstract

The valve seat assembly and the valve device comprise the valve port part and the valve body, at least part of the valve port part is subjected to injection molding with the valve seat as an insert, at least one of the valve port part and the valve seat comprises the concave part, at least one of the valve port part and the valve seat comprises the embedded part, and the embedded part is located in the concave part, so that the assembly error is reduced, and the inner leakage prevention performance of the valve seat assembly is improved.

Description

Technical Field

[0001] The present invention relates to a control element, and particularly to a valve seat assembly and a valve device. Background Art

[0002] The valve device includes a sealing ring, the sealing ring includes a valve port, the sealing ring and other components are assembled, and the material properties of the sealing ring are used to improve the anti-inner leakage performance of the valve. However, the assembly method of the sealing ring and other components is prone to assembly errors, which in turn causes the problem of poor anti-inner leakage performance of the valve. Summary of the Invention

[0003] The purpose of the present invention is to provide a valve seat assembly and a valve device, which are beneficial to improving the anti-inner leakage performance of the valve seat assembly.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention provides a valve seat assembly, including a valve port portion and a valve seat. The valve port portion has a valve port, the valve seat has a first hole, the first hole extends along the axial direction of the valve seat, at least a part of the valve port portion is located in the first hole, at least part of the valve port portion is injection molded with the valve seat as an insert, at least one of the valve port portion and the valve seat includes a concave portion, and at least one of the valve port portion and the valve seat includes an embedding portion, and the embedding portion is located in the concave portion.

[0006] In the valve seat assembly and the valve device provided by the embodiment of the present invention, at least part of the valve port portion is injection molded with the valve seat as an insert, at least one of the valve port portion and the valve seat includes a concave portion, at least one of the valve port portion and the valve seat includes an embedding portion, and the embedding portion is located in the concave portion, reducing the assembly error, and thus being beneficial to improving the anti-inner leakage performance of the valve seat assembly. Description of the Drawings

[0007] Figure 1 is a three-dimensional structural schematic diagram of the valve device provided by the first embodiment;

[0008] Figure 2 is Figure 1 the sectional structural schematic diagram of

[0009] Figure 3 is Figure 2 the partial enlarged structural schematic diagram at "A" in

[0010] Figure 4 is Figure 1 the three-dimensional structural schematic diagram after removing the valve body;

[0011] Figure 5 is Figure 4 the exploded structural schematic diagram of

[0012] Figure 6 is Figure 4 The three-dimensional structural schematic diagram of the middle valve seat;

[0013] Figure 7 is Figure 4 The sectional structural schematic diagram of the middle valve seat;

[0014] Figure 8 is Figure 4 The three-dimensional structural schematic diagram of the middle valve port part;

[0015] Figure 9 is Figure 4 The sectional structural schematic diagram of the middle valve port part;

[0016] Figure 10 The sectional structural schematic diagram of the valve device provided by the second embodiment;

[0017] Figure 11 is Figure 10 The partial enlarged structural schematic diagram at "B" in the middle;

[0018] Figure 12 is Figure 10 The sectional structural schematic diagram of the middle valve seat;

[0019] Figure 13 is Figure 10 The sectional structural schematic diagram of the middle valve port part;

[0020] Figure 14 The sectional structural schematic diagram of the valve device provided by the third embodiment;

[0021] Figure 15 is Figure 14 The partial enlarged structural schematic diagram at "C" in the middle;

[0022] Figure 16 is Figure 14 The sectional structural schematic diagram of the middle valve seat;

[0023] Figure 17 is Figure 14 The sectional structural schematic diagram of the middle valve port part;

[0024] Figure 18 The sectional structural schematic diagram of the valve device provided by the fourth embodiment;

[0025] Figure 19 is Figure 18 The partial enlarged structural schematic diagram at "D" in the middle;

[0026] Figure 20 is Figure 18 The sectional structural schematic diagram of the middle valve seat;

[0027] Figure 21 is Figure 18Schematic cross-sectional structure diagram of the valve port part;

[0028] Figure 22 It is a schematic cross-sectional structure diagram of the mold provided by this embodiment;

[0029] Figure 23 Is Figure 22 A schematic cross-sectional structure diagram of the module in;

[0030] Figure 24 Is Figure 12 A schematic cross-sectional structure diagram of the first mold base in;

[0031] Figure 25 Is Figure 12 A schematic cross-sectional structure diagram of the second mold base and the third mold base in;

[0032] 100. Valve; 200. Mold; 1. Valve port part; 2. Valve body; 3. Valve seat; 4. Valve needle; 5. Sealing ring; 6. Module; 7. Cavity; 8. Sealing groove; 11. Valve port; 12. First embedding part; 13. Second concave part; 14. First pipe section; 15. Second pipe section; 16. Third pipe section; 171. First outer peripheral wall; 172. Fifth end wall; 173. Sixth end wall; 174. Third outer peripheral wall; 175. Second end wall; 111. First tapered hole section, 112. Straight hole section; 113. Second tapered hole section; 141. Drainage surface; 121. Fourth outer peripheral wall; 131. Second groove; 132. Third groove; 133. Third limiting hole; 134. First ring part; 135. Second ring part; 1321. Fourth inner peripheral wall; 1331. Fifth inner peripheral wall; 21. Second hole; 22. Second inner peripheral wall; 31. First hole; 32. First concave part; 33. Second embedding part; 34. Small hole section; 35. Medium hole; 36. Second outer peripheral wall; 37. First end wall; 38. Sixth outer peripheral wall; 311. First inner peripheral wall; 312. Third end wall; 313. Fourth end wall; 321. First groove; 322. Second limiting hole; 323. Annular groove; 331. Fifth outer peripheral wall; 3211. Third inner peripheral wall; 3221. Sixth inner peripheral wall; 41. First tapered rod section; 61. First mold base; 62. Second mold base; 63. Third mold base; 64. First mandrel; 65. Second mandrel; 66. Second core hole; 611. First core hole. Detailed implementation manners

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0034] It should be noted that the existing valve device includes a valve body, a sealing ring, and a valve needle. The valve body includes a mounting hole, and the sealing ring is installed in the mounting hole. The sealing ring is made of an elastic material and includes a valve port. The valve body is assembled from multiple parts, where "multiple parts" refers to no less than two parts. These multiple parts cooperate to form the above-mentioned mounting hole, and the cooperation structure of the multiple parts includes at least one of screw thread cooperation and welding cooperation, so as to facilitate the installation of the sealing ring in the mounting hole by assembling the sealing ring and the multiple parts. The valve needle is slidably connected to the valve body, and by sliding the valve needle, the valve needle can block or open the valve port. However, the structure of assembling the sealing ring and the valve body is prone to assembly errors. Assembly errors include, but are not limited to, at least one of the sealing ring dimension error, part dimension error, assembly tool error, assembly measuring tool error, assembly operation error, and assembly environment error. Assembly tools include, but are not limited to, at least one of a hammer, a wrench, a fixture, and a screwdriver. Assembly measuring tool errors include, but are not limited to, at least one of a ruler, a distance sensor, and a force sensor. Assembly operations include, but are not limited to, relying on human senses to identify whether the assembly accuracy meets the standard. The assembly environment includes, but is not limited to, at least one of the temperature, humidity, air pressure, vibration, and electromagnetic field during assembly. Moreover, with the operation and use of the valve, the deformation and wear of the sealing ring and the multiple parts will bring additional errors, which further exacerbate the assembly errors, making the anti-inner leakage performance of the valve more unstable, and the valve is very likely to have the problem of inner leakage. Due to the above-mentioned assembly errors, there are likely to be problems such as a large gap between multiple parts of the valve body, a large gap between the sealing ring and the valve body, and a reduced sealing effect of the valve needle on the valve port, which leads to the sealing failure inside the valve, that is, the anti-inner leakage performance of the valve far fails to meet the expectations.

[0035] Based on the above technical problems, as Figures 1 to 21 shown, this embodiment provides a valve seat assembly 100, which includes a valve port part 1, a valve seat 3, and a sealing ring 5.

[0036] As Figure 9 、 Figure 13 、 Figure 17 and Figure 21 shown, the valve port part 1 has a valve port 11, and the valve port 11 is a passage for the medium to flow through. The medium includes, but is not limited to, at least one of R134a, R134yf, propane, ammonia, water, ethylene glycol, and refrigeration oil.

[0037] The valve orifice part 1 is made of plastic. The valve orifice part 1 made of plastic has the characteristic of softness. The plastic for making the valve orifice part 1 includes but is not limited to at least one of rubber, polytetrafluoroethylene, polypropylene, and polyethylene. The material used for the valve seat 3 includes but is not limited to at least one of stainless steel, aluminum alloy, and copper. The soft performance of the valve orifice part 1 is superior to that of the valve seat 3. When the valve needle 4 closes the valve orifice 11, the valve orifice 11 and the valve needle 4 form a soft seal structure. Utilizing the material characteristics of the valve orifice part 1, the sealing performance between the valve needle 4 and the valve orifice part 1 is improved.

[0038] As Figure 9 shown, the valve orifice 11 has a first tapered hole section 111. When the valve needle 4 closes the valve orifice 11, at least a part of the valve needle 4 contacts the inner wall forming the first tapered hole section 111. The valve orifice part 1 plays an oblique supporting role for the valve needle 4, further improving the sealing performance between the valve orifice 11 and the valve needle 4, and also avoiding the problem that stress concentration occurs on the valve orifice part 1 by the valve needle 4, which may cause deformation or even rupture of the valve orifice part 1.

[0039] The valve orifice 11 also has a straight hole section 112 and a second tapered hole section 113. The first tapered hole section 111 is connected to the straight hole section 112, and the straight hole section 112 is connected to the second tapered hole section 113. The aperture at one end of the first tapered hole section 111 is larger than the aperture at the other end of the first tapered hole section 111. The apertures at both ends of the straight hole section 112 are basically the same. The aperture at one end of the second tapered hole section 113 is larger than the aperture at the other end of the second tapered hole section 113. The end with a smaller aperture of the first tapered hole section 111 is connected to one end of the straight hole section 112, and the end with a smaller aperture of the second tapered hole section 113 is connected to the other end of the straight hole section 112. The end with a larger aperture of the first tapered hole section 111 is smaller than the end with a larger aperture of the second tapered hole section 113. During the injection molding process of the valve orifice part 1 with the valve seat 3 as an insert, the design of the valve orifice 11 facilitates the mold 200 to disengage from the valve orifice part 1, that is, facilitates the demolding of the valve orifice part 1. Unexpectedly, the first tapered hole section 111, the straight hole section 112, and the second tapered hole section 113 form a pipeline with a gradually shrinking and then gradually expanding aperture. When the flowing medium passes through the valve orifice 11, the flowing medium generates a Venturi effect in the valve orifice 11. The shape of this valve orifice 11 improves the flow regulation accuracy, energy-saving effect, and noise reduction effect of the valve device.

[0040] As Figure 9 shown, the valve orifice part 1 includes a first pipe section 14, a second pipe section 15, and a third pipe section 16. The first pipe section 14 includes the above-mentioned first tapered hole section 111, the second pipe section 15 includes the above-mentioned straight hole section 112, and the third pipe section 16 includes the above-mentioned second tapered hole section 113. The first pipe section 14, the second pipe section 15, and the third pipe section 16 are an integral structure. The first pipe section 14 is located inside the second pipe section 15, and the second pipe section 15 is located inside the third pipe section 16.

[0041] As Figure 3 、 Figure 11 、Figure 15 and Figure 19 As shown in Figure 19 , the valve port part 1 includes a drainage surface 141. The drainage surface 141 is located in the first hole 31. The drainage surface 141 contacts to form the inner wall of the valve port 11. When the flowing medium flows onto the drainage surface 141, the drainage surface 141 introduces the flowing medium into the valve port 11, playing a role in drainage. Specifically, the drainage surface 141 is located at the end of the first pipe section 14. The shape of the drainage surface 141 is an annular surface. The inner side of the inner wall of the formed valve port 11 contacts the drainage surface 141, and the outer side of the drainage surface 141 contacts the first inner peripheral wall 311, further improving the drainage effect of the drainage surface 141.

[0042] As Figure 5 , Figure 6 , Figure 12 , Figure 16 and Figure 20 As shown in Figure 5 , Figure 6 , Figure 12 , Figure 16 and Figure 20 , the valve seat 3 is an integral structure. The valve seat 3 has a first hole 31. At least a part of the valve port part 1 is located in the first hole 31. The valve port part 1 includes a first outer peripheral wall 171. The inner wall forming the first hole 31 includes a first inner peripheral wall 311. At least a part of the first outer peripheral wall 171 contacts the first inner peripheral wall 311. The valve port part 1 and the valve seat 3 are closely fitted, improving the anti - internal leakage performance of the valve device.

[0043] As Figure 2 , Figure 10 , Figure 14 and Figure 18 As shown in Figure 2 , Figure 10 , Figure 14 and Figure 18 , at least a part of the first hole 31 communicates with the valve port 11. At least a part of the first hole 31 and the valve port 11 constitute a channel for the medium to flow through. At least a part of the valve needle 4 is located in the first hole 31 to facilitate the opening or closing of the valve port 11 by the valve needle 4 inside the valve seat 3. The first hole 31 penetrates through the valve seat 3, facilitating the mold 200 to be clamped or demolded with the valve seat 3 during the injection molding process of the valve port part 1 with the valve seat 3 as an insert.

[0044] As Figure 6 , Figure 7 , Figure 13 , Figure 17 and Figure 21As shown, at least a part of the valve port portion 1 is injection molded with the valve seat 3 as an insert. At least one of the valve port portion 1 and the valve seat 3 includes a recess, and at least one of the valve port portion 1 and the valve seat 3 includes an embedding portion. The embedding portion is located in the recess, so that the valve port portion 1 and the valve seat 3 are fitted together. The fitting structure of the embedding portion and the recess includes, but is not limited to, at least one of a plugging structure and a clamping structure. The fitting structure of the valve port portion 1 and the valve seat 3 improves the connection stability between the valve port portion 1 and the valve seat 3, and avoids the problems of loosening and deformation between the valve port portion 1 and the valve seat 3. The valve port portion 1 is an integral structure, and the valve seat 3 is also an integral structure. The valve port portion 1 can be made by an injection molding process, or can be made by at least one of, but not limited to, an injection molding process, an extrusion molding process, a calendering molding process, a laminating molding process, and a compression molding process of plastics. The plastics used are plastics with elasticity, easy thermoplastic processing, corrosion resistance, and good mechanical strength, including but not limited to at least one of TPE, PP, PVC, and PU. During the process of injection molding the valve port portion 1 with the valve seat 3 as an insert, the molten plastics are embedded in the valve seat 3 and then solidified into the valve port portion 1, thus forming an integral structure of the valve port portion 1 and the valve seat 3. This not only reduces the number of parts of the valve seat 3 and eliminates the complex assembly structure, making the assembly process of the valve device simpler and easier, reducing the production and manufacturing costs, but also makes the connection structure between the valve port portion 1 and the valve seat 3 more stable and tight, further improving the anti-inner leakage performance of the valve device.

[0045] As shown in the figure, in some embodiments, the recess includes a first recess 32. The first recess 32 is formed in the valve seat 3. The first recess 23 extends along the radial direction of the first hole 31. The embedding portion includes a first embedding portion 12. The first embedding portion 12 extends along the radial direction of the valve port 11. The first embedding portion 12 is located in the first recess 32. The first embedding portion 12 and the first recess 32 are fitted together, further improving the connection stability between the valve port portion 1 and the valve seat 3. The fitting structure of the first recess 32 and the first embedding portion 12 includes, but is not limited to, at least one of a plugging structure and a clamping structure.

[0046] In some embodiments, the fitting structure of the first recess 32 and the first embedding portion 12 is a plugging structure. At least a part of the first embedding portion 12 is located within the first recess 32. The shape of the first recess 32 includes, but is not limited to, at least one of a groove and a hole.

[0047] When the shape of the first recess 32 includes a groove, the groove of the first recess 32 is a first opening. The first opening is formed on the inner wall of the first hole 31, that is, on the first inner peripheral wall 311. At least a part of the first embedding portion 12 is located within the first opening. As Figures 11 to 13As shown, in some embodiments, the first orifice is an annular groove 323. The radial direction of the annular groove 323 is the extending direction of the first recess 32. The annular groove 323 is located on the inner wall forming the first hole 31. The overall of the annular groove 323 and the first hole 31 is a stepped hole. The first hole 31 includes two small hole segments 34. The annular groove communicates with the two small hole segments 34. The two small hole segments 34 are located at both ends of the annular groove 323. The aperture of the annular groove 323 is larger than that of the small hole segment 34. At least a part of the first embedding portion 12 is annular and is located in the annular groove 323, which improves the connection stability between the valve orifice portion 1 and the valve seat 3. The inner wall forming the annular groove 323 includes a third end wall 312 and a fourth end wall 313. The third end wall 312 is located at one end of the first inner peripheral wall 311. The fourth end wall 313 is located at the other end of the first inner peripheral wall 311. The third end wall 312 and the fourth end wall 313 are respectively located at both ends of the first inner peripheral wall 311. The first embedding portion 12 includes a fifth end wall 172 and a sixth end wall 173. The fifth end wall 172 is located at one end of the first outer peripheral wall 171. The sixth end wall 173 is located at the other end of the first outer peripheral wall 171. The fifth end wall 172 and the sixth end wall 173 are respectively located at both ends of the first outer peripheral wall 171. At least a part of the third end wall 312 contacts the fifth end wall 172. At least a part of the fourth end wall 313 contacts the sixth end wall 173. The sealing structure between the valve orifice portion 1 and the valve seat 3 is more complex, which further improves the anti-inner leakage performance of the valve device. In some embodiments, the fifth end wall 172 and the drainage surface 115 are located on the same end face of the valve orifice portion 1. A part of this end face serves as the fifth end wall 172, and another part of this end face serves as the drainage surface 115.

[0048] As Figures 19 to 21 shown, in some embodiments, the first orifice has a first groove 321. At least a part of the first embedding portion 12 is located in the first groove 321. The inner wall forming the first groove 321 includes a third inner peripheral wall 3211, and the third inner peripheral wall 3211 is formed on the first inner peripheral wall 311. The first groove 321 communicates with the first hole 31. The outer wall of the first embedding portion 12 includes a fourth outer peripheral wall 121, and the fourth outer peripheral wall 121 is formed on the first outer peripheral wall 171. At least a part of the fourth outer peripheral wall 121 contacts the third inner peripheral wall 3211.

[0049] When the shape of the first recess 32 includes a hole, the hole of the first recess 23 not only has a first orifice but also has a second orifice. The first orifice communicates with the second orifice. The second orifice is located on the outer wall of the valve seat 3. The outer wall of the first embedding portion 12 is flush with the outer wall of the valve seat 3 or protrudes relative to the outer wall of the valve seat 3 or is recessed relative to the outer wall of the valve seat 3. During the injection molding process of the valve orifice portion 1 with the valve seat 3 as an insert, the second orifice can be used as a gate. The plastic in a molten state can flow into the second orifice, the first orifice, and the first hole 31 through the second orifice, and then solidify into the valve orifice portion 1. The structure where the first hole 31, the first orifice, and the second orifice communicate facilitates the formation of an integral valve orifice portion 1.

[0050] As Figures 3 to 9 and Figures 15 to 17 shown, in some embodiments, the hole of the first recess 23 formed by the first port and the second port has a second limiting hole 322. The first embedding portion 12 is convex on the valve port portion 1. The overall shape of the valve port portion 1 is generally tubular. The first embedding portion 12 extends to the radial outside of the valve port portion 1. At least a part of the first embedding portion 12 is located within the second limiting hole 322. The inner wall forming the second limiting hole 322 includes a sixth inner peripheral wall 3221. The sixth inner peripheral wall 3221 is formed on the first inner peripheral wall 311. The fourth outer peripheral wall 121 is formed on the first outer peripheral wall 171. At least a part of the sixth inner peripheral wall 3221 is located on the first outer peripheral wall 171. As Figure 3 shown, the entire first embedding portion 12 is located within the second limiting hole 322. The outer wall of the first embedding portion 12 is flush with the outer wall of the valve seat 3, avoiding the problem that the surface of the valve seat 3 is uneven due to the protrusion of the first embedding portion 12. The first embedding portion 12 and the second limiting hole 322 are adapted to each other. The shape of the second limiting hole 322 includes but is not limited to at least one of a straight hole, a stepped hole, and a counterbore. Using at least one of the stepped hole and the counterbore as the shape of the second limiting hole 322 can further improve the connection stability between the valve port portion 1 and the valve seat 3. The second limiting hole 322 communicates with the first hole 31. During the process of injection molding the valve port portion 1 with the valve seat 3 as an insert, the second limiting hole 322 can serve as a gate. The plastic in a molten state can flow into the first hole 31 and the second limiting hole 322 through the second limiting hole 322 and then solidify into the valve port portion 1. The structure in which the first hole 31 and the second limiting hole 322 communicate facilitates the formation of an integral valve port portion 1. The first embedding portion 12 and the second limiting hole 322 are adapted to each other. The cross-section of the second limiting hole 322 is rectangular, further improving the connection stability between the valve port portion 1 and the valve seat 3. Moreover, during the process of injection molding the valve port portion 1 with the valve seat 3 as an insert, the valve port portion 1 and the valve seat 3 with good connection stability are convenient for demolding.

[0051] As Figure 6 shown, in some embodiments, there are at least two second limiting holes 322. Two or more second limiting holes 322 are uniformly arranged on the valve seat 3 with the first hole 31 as the center. There are also at least two first embedding portions 12. Two or more first embedding portions 12 are uniformly arranged on the valve port portion 1 with the second pipe section 15 as the center. Two or more first embedding portions 12 are respectively located within two or more second limiting holes 322, further improving the connection stability between the valve port portion 1 and the valve body 2. Moreover, during the process of injection molding the valve port portion 1 with the valve seat 3 as an insert, the multiple second limiting holes 322 are equivalent to multiple gates, facilitating the rapid and uniform filling of the plastic in a molten state into the first hole 31.

[0052] As Figure 9As shown, in some embodiments, the outer diameters of the first pipe section 14, the second pipe section 15, and the third pipe section 16 are the same. It can be seen therefrom that the wall thickness of the second pipe section 15 is not less than that of the first pipe section 14, and the wall thickness of the second pipe section 15 is also not less than that of the third pipe section 16. The wall thickness of the second pipe section 15 is relatively large. Considering that the second pipe section 15 with a relatively large wall thickness is the part of the valve port 1 that cures later. At least a part of the first embedding portion 12 is located on the second pipe section 15, which is beneficial for forming the valve port 1 through a plastic molding process. During the injection molding process of the valve port 1 with the valve seat 3 as an insert, the molten plastic first enters the position of the second pipe section 15 through the second limiting hole 322, which is beneficial for the molten plastic to solidify in the first hole 31 to form the valve port 1, and is also beneficial for pressure holding, flowing, exhausting, and feeding in the plastic molding process, avoiding shrinkage holes or surface defects in the valve port 1. The pipe length of the first pipe section 14 is less than that of the second pipe section 15, and the pipe length of the second pipe section 15 is less than that of the third pipe section 16. At least a part of the first embedding portion 12 is located on the third pipe section 16, which is beneficial for forming the valve port 1 through a plastic molding process.

[0053] As shown in the figure, in some embodiments, the recess includes a second recess 13, the second recess 13 is formed in the valve port 1, the second recess 13 extends along the axial direction of the valve port 11, the embedding portion includes a second embedding portion 33, the second embedding portion 33 is formed in the valve seat 3, the second embedding portion 33 extends along the axial direction of the second hole 211, the second embedding portion 33 is located in the second recess 13, and the second embedding portion 33 and the second recess 13 are fitted together. The fitting structure of the second embedding portion 33 and the second recess 13 includes, but is not limited to, at least one of a plugging structure and a clamping structure.

[0054] As shown in the figure, in some embodiments, the connection structure between the second embedding portion 33 and the second recess 13 is a plugging structure, and at least a part of the second embedding portion 33 is located in the second recess 13. The shape of the second recess 13 has, but is not limited to, at least one of a groove and a hole.

[0055] As Figures 15 to 17 shown, in some embodiments, the shape of the second recess 13 has a groove, the groove of the second recess 13 includes a second groove 131, the axial direction of the second groove 131 is the extension direction of the second recess 13, at least a part of the second embedding portion 33 is located in the second groove 131, at least a part of the first outer peripheral wall 171 is located on the inner wall forming the second groove 131, and at least a part of the first inner peripheral wall 311 contacts the inner wall forming the second groove 131, so as to facilitate the manufacturing and processing of the valve port 1 and the valve seat 3.

[0056] As Figures 15 to 17As shown, in some embodiments, the second recess 13 includes a first ring portion 134 and a second ring portion 135. At least a part of the first ring portion 134 is located within the second ring portion 135. The valve port 11 is formed in the first ring portion 134. At least a part of the first ring portion 134 contacts the inner wall of the first hole 31 forming the first hole 31. At least a part of the second ring portion 135 contacts the outer wall of the valve seat 3, further providing anti-inner leakage performance for the valve port portion 1 and the valve seat 3.

[0057] As Figures 18 to 21 shown, in some embodiments, some of the second recesses 13 may also extend radially along the valve port 11, some of the second insertion portions 33 extend radially along the first hole 31. The shape of the second recess 13 has a hole. The hole of the second recess 13 includes a third limiting hole 133. The axial direction of the third limiting hole 133 is the extending direction of the second recess 13. At least a part of the second insertion portion 33 is located within the third limiting hole 133. The third limiting hole 133 communicates with the valve port 1. The inner wall forming the third limiting hole 133 includes a fifth inner peripheral wall 1331. One side of the fifth inner peripheral wall 1331 is formed on the first outer peripheral wall 171. The other side of the fifth inner peripheral wall 1331 is formed on the inner wall of the valve port 11. The outer wall of the second insertion portion 33 includes a fifth outer peripheral wall 331. The fifth outer peripheral wall 331 is formed on the first inner peripheral wall 311. At least a part of the fifth outer peripheral wall 1331 contacts the fifth outer peripheral wall 331.

[0058] As Figures 15 to 17 shown, in some embodiments, some of the second recesses 13 may also extend radially along the valve port 11, some of the second insertion portions 33 extend radially along the first hole 31. The second recess 13 has a third groove 132. At least a part of the second insertion portion 33 is located within the third groove 132. The inner wall forming the third groove 132 includes a fourth inner peripheral wall 1321. The fourth inner peripheral wall 1321 is formed on the first outer peripheral wall 171. The outer wall of the second insertion portion 33 includes a fifth outer peripheral wall 331. The fifth outer peripheral wall 331 is formed on the first inner peripheral wall 311. At least a part of the fifth outer peripheral wall 331 contacts the fourth inner peripheral wall 1321.

[0059] As Figure 2 、 Figure 10 、 Figure 14 and Figure 18 shown, in some embodiments, the aperture of the valve port 11 is smaller than the aperture of the first hole 31. The valve port 11 and the first hole 31 constitute a stepped hole. The valve needle 4 can fully contact the valve port portion 1, improving the soft sealing performance of the valve port portion 1 and the valve needle 4. One end of the valve port 11 is located within the first hole 31. This end of the valve port 11 can contact the valve needle 4. The aperture of this end of the valve port 11 is the aperture of the valve port 11. Specifically, this end of the valve port 11 refers to the end with a larger aperture of the first tapered hole section 131. In some embodiments, the aperture of the valve port 11 is also smaller than the aperture of the small hole section 34, improving the soft sealing performance of the valve port portion 1 and the valve needle 4.

[0060] At least one of the valve port portion 1 and the valve seat 3 has a sealing groove 8. The sealing groove 8 can be formed in the valve port portion 1, or can be formed in the valve seat 3, or can be formed in both the valve port portion 1 and the valve seat 3. The inner wall of the formed sealing groove 8 includes a first circumferential wall, a first end wall 37 and a second end wall 175. The first circumferential wall extends to the first end wall 37 and the second end wall 175. The first end wall 37 and the second end wall 175 are arranged with a gap therebetween, and at least a part of the sealing ring 8 is located in the gap between the first end wall 37 and the second end wall 175.

[0061] In some embodiments, the sealing groove 8 is formed in both the valve port portion 1 and the valve seat 3. The first end wall 37 is formed in the valve seat 3, the second end wall 175 is formed in the valve port portion 1, and the first circumferential wall is formed in at least one of the valve port portion 1 and the valve seat 3. It can be formed in the valve port portion 1, or can be formed in the valve seat 3, or can be formed in both the valve port portion 1 and the valve seat 3. The sealing ring 8 and the valve port portion 1 and the valve seat 3 constitute a sealing structure, further improving the anti-inner leakage performance of the valve device.

[0062] As Figure 3 shown, in some embodiments, the first circumferential wall is formed in the valve port portion 1. The first circumferential wall is a part of the first outer circumferential wall 171. The first end wall 37 is formed at the end of the valve seat 3. The second end wall 175 extends to the radial outside of the valve port portion 1, and the second end wall 175 contacts the first outer circumferential wall 171.

[0063] As Figure 15 and Figure 16 shown, in some embodiments, the first circumferential wall is formed in the valve seat 3. The first circumferential wall is the sixth outer circumferential wall 38. The sixth outer circumferential wall 38 is formed on the outer wall of the valve seat 3. The first end wall 37 extends to the radial outside of the sixth outer circumferential wall 38, and the first end wall 37 contacts the sixth outer circumferential wall 38.

[0064] As Figure 3 shown, the overall shape of the valve seat 3 is generally tubular. The valve seat 3 includes a medium hole 35. The medium hole 35 extends along the radial direction of the valve seat 3. The medium hole 35 communicates with the first hole 31. The medium hole 35, the first hole 31 and the valve port 11 constitute a channel for the medium to flow. The drainage surface 141 is not located in the radial direction of the medium hole 35. At least a part of the sixth inner circumferential wall 3221 contacts the first inner circumferential wall 311. The arrangement direction of the inner wall of the medium hole 35, the drainage surface 141 and the sixth inner circumferential wall 3221 is consistent with the axial direction of the first hole 31. The drainage surface 141 separates the medium hole 35 and the second limiting hole 322, preventing the molten plastic from leaking through the medium hole 35 during the injection molding process of the valve port portion 1 with the valve seat 3 as an insert.

[0065] There are at least two dielectric holes 35. More than two dielectric holes 35 are evenly arranged on the valve seat 3 centered on the first hole 31. The medium can flow into the first hole 31 and the valve port 11 through more than two dielectric holes 35 to improve the stability of the medium flow. As Figure 6 and Figure 7 shown, in some embodiments, there are four dielectric holes 35. Among them, the hole directions of a pair of dielectric holes 35 are the same, and the hole directions of the other pair of dielectric holes 35 are the same. When machining the valve seat 3, a drill bit can open a pair of dielectric holes 35 at one time. Therefore, only two drilling steps are required to complete the four dielectric holes 35.

[0066] As Figures 1 to 3 shown, this embodiment also provides a valve device, which includes the above-mentioned valve seat assembly, and also includes a valve body 2 and a valve needle 4.

[0067] The valve body 21 has a second hole 211. At least a part of the valve seat 3 and the valve port part 1 is located in the second hole 211. The inner wall forming the second hole 211 includes a second inner peripheral wall 212. The valve seat 3 includes a second outer peripheral wall 36. At least a part of the second outer peripheral wall 36 contacts the second inner peripheral wall 212. The valve port part 1 includes a third outer peripheral wall 174. At least a part of the third outer peripheral wall 174 is located on the second inner peripheral wall 212. The valve body 21 and the valve seat 3 form a sealing structure, and the valve body 21 and the valve port part 1 also form a sealing structure, further improving the anti-inner leakage performance of the valve device.

[0068] At least a part of the sealing ring 5 contacts the second inner peripheral wall 212, and the sealing ring 5 is in a compressed state, further improving the anti-inner leakage performance of the valve device.

[0069] The valve needle 4 is slidable relative to the valve port part 1. The valve needle 4 extends along the axial direction of the valve port 11. When the valve needle 4 slides relative to the valve port part 1, the valve needle 4 can open or close the valve port 11. By sliding the valve needle 4, the opening degree of the valve port 11, that is, the opening of the valve port 11, can be adjusted, realizing the adjustment of the medium flow rate by the valve.

[0070] As Figure 2 、 Figure 10 、 Figure 14 and Figure 18 shown, the valve needle 4 includes a first tapered rod section 41. The taper of the first tapered rod section 41 is basically the same as the taper of the first tapered hole section 111. When the valve needle 4 closes the valve port 11, at least a part of the outer peripheral wall of the first tapered rod section 41 contacts the inner wall forming the first tapered hole section 111. The outer peripheral wall of the first tapered rod section 41 is in full contact with the inner wall forming the first tapered hole section 111, further improving the sealing performance between the valve port 11 and the valve needle 4 and the oblique support effect of the valve port part 1 on the valve needle 4.

[0071] As Figures 22 to 25As shown in the figure, this embodiment also provides a mold 200 for preparing a valve port portion 1 on the valve seat 3 of the above-mentioned valve 100. The mold 200 includes the above-mentioned valve seat 3 and further includes a module 6. The valve seat 3 and the module 6 are cooperatively arranged, and a cavity 7 is formed by their cooperation. The second limiting hole 322 communicates with the cavity 7. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, the plastic in a molten state can be injected into the cavity 7 through the second limiting hole 322. The plastic in a molten state can be solidified into the valve port portion 1 in the cavity 7. After the solidification is completed, the valve seat 3 and the module 6 are separated from each other, and the valve port portion 1 and the valve seat 3 arranged in an embedded manner are obtained.

[0072] The module 6 includes a first mold base 61. The first mold base 61 is located on the valve seat 3, and at least a part of the first mold base 61 is located in the first hole 31. The first mold base 61 includes a first parting surface. The first parting surface is located in the first hole 31 and also located on the first inner peripheral wall 311. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, after the valve port portion 1 is solidified, the drainage surface 141 is located on the first parting surface.

[0073] The module 6 further includes a first core shaft 64. The first core shaft 64 and the first mold base 61 are cooperatively arranged. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, after the valve port portion 1 is solidified, at least a part of the first core shaft 64 is located in the first tapered hole section 111.

[0074] As Figure 24 shown, the first mold base 61 includes a first core hole 611. A part of the first core shaft 64 is located in the first core hole 611. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, the first core shaft 64 can be inserted into or detached from the first core hole 611 to facilitate the mold closing and demolding of the mold 200.

[0075] The module 6 further includes a second mold base 62 and a third mold base 63. The second mold base 62 and the third mold base 63 are located on the valve seat 3. The second mold base 62 and the valve seat 3 are cooperatively arranged, and the second mold base 62 and the third mold base 63 are cooperatively arranged. The first mold base 61 plugs one end of the first hole 31, and the second mold base 62 and the third mold base 63 plug the other end of the second hole 211. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, by disassembling and assembling the second mold base 62 and the third mold base 63, the mold closing and demolding of the mold 200 are facilitated.

[0076] As Figure 25As shown, the module 6 further includes a second mandrel 65. One end of the second mandrel 65 is located at one end of the first mandrel 64. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, at least a part of the second mandrel 65 is located within the second tapered hole section 113 of the valve port portion 1. The second mandrel 65 is arranged in cooperation with the second mold base 62 and the third mold base 63. The second mold base 62 and the third mold base 63 include a second core hole 66. The second mold base 62 and the third mold base 63 cooperate to form the second core hole 66. During the injection molding process of the valve port portion 1 with the valve seat 3 as an insert, the second mandrel 65 is inserted into or disengaged from the second core hole 66 to facilitate the mold clamping and demolding of the mold 200.

[0077] This embodiment also provides a manufacturing method of a valve 100. The above-mentioned mold 200 is used to prepare the valve port portion 1 and the valve seat 3 which are fitted together on the valve seat 3 of the above-mentioned valve 100, including:

[0078] Clamp the module 6 and the valve seat 3;

[0079] Inject molten plastic into the cavity 7 formed by the cooperation of the module 6 and the valve seat 3 through the second limiting hole 322;

[0080] Solidify the molten plastic to obtain the valve port portion 1;

[0081] Demold the module 6, the valve seat 3 and the valve port portion 1 to obtain the valve port portion 1 and the valve seat 3 which are fitted together.

[0082] It should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present invention or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. A valve seat assembly, comprising a valve mouth portion (1) and a valve seat (3), wherein the valve mouth portion (1) has a valve mouth (11), and the valve seat (3) has a first hole (31), wherein the first hole (31) extends along the axial direction of the valve seat (3), at least a portion of the valve mouth portion (1) is located in the first hole (31), and at least a portion of the valve mouth portion (1) is injection molded with the valve seat (3) as an insert, and at least one of the valve mouth portion (1) and the valve seat (3) includes a recessed portion, and at least one of the valve mouth portion (1) and the valve seat (3) includes an embedded portion, and the embedded portion is located in the recessed portion.

2. The valve seat assembly according to claim 1, It is characterized in that The recessed portion includes a first recessed portion (32), which is formed on the valve seat (3) and extends radially along the first hole (31); the embedded portion includes a first embedded portion (12), which is formed on the valve mouth portion (1), and extends radially along the valve mouth (11); the first embedded portion (12) is located in the first recessed portion (32).

3. The valve according to claim 2, It is characterized in that The first recess (32) has a first opening, the first opening is located on the inner wall forming the first hole (31), and at least a portion of the first embedded portion (12) is located at the first opening.

4. The valve according to claim 3, It is characterized in that The first recess (32) has a second port, the first port is connected to the second port, the second port is located on the outer wall of the valve seat (3), and the outer wall of the first embedded portion (12) is flush with the outer wall of the valve seat (3) or protrudes relative to the outer wall of the valve seat (3).

5. The valve according to any one of claims 1 to 4, It is characterized in that The recessed portion includes a second recessed portion (13), the second recessed portion (13) is formed on the valve mouth portion (1), and the second recessed portion (13) extends axially along the valve mouth (1); the embedded portion includes a second embedded portion (33), the second embedded portion (33) is formed on the valve seat (3), the second embedded portion (33) extends axially along the second hole (31), and the second embedded portion (33) is located in the second recessed portion (13).

6. The valve seat assembly according to claim 5, It is characterized in that The second recess (13) includes a first ring portion (134) and a second ring portion (135), at least a portion of the first ring portion (134) is located in the second ring portion (135), the first ring portion (134) extends along the axial direction of the valve port (11), the second ring portion (135) extends along the axial direction of the valve port (11), the valve port (11) is formed in the first ring portion (134), at least a portion of the first ring portion (134) contacts the inner wall of the first hole (31), and at least a portion of the second ring portion (135) contacts the outer wall of the valve seat (3).

7. The valve seat assembly according to claims 1 to 6, It is characterized in that The valve seat assembly includes a sealing ring (5), and at least one of the valve mouth portion (1) and the valve seat (3) has a sealing groove (8). The inner wall forming the sealing groove (8) includes a first peripheral wall, a first end wall (37) and a second end wall (175). The first peripheral wall extends to the first end wall (37) and the second end wall (175). A gap is set between the first end wall (37) and the second end wall (175), and at least a portion of the sealing ring (5) is located in the gap between the first end wall (37) and the second end wall (175).

8. The valve according to claim 7, It is characterized in that The sealing groove (5) is formed on the valve mouth portion (1) and the valve seat (3), the first end wall (37) is formed on the valve seat (3), the second end wall (175) is formed on the valve mouth portion (1), and the first peripheral wall is formed on at least one of the valve seat (3) and the valve mouth portion (1).

9. The valve according to any one of claims 1 to 8, It is characterized in that The inner wall forming the first hole (31) includes a first inner peripheral wall (311), and the valve port portion (1) includes a first outer peripheral wall (171), and at least a portion of the first outer peripheral wall (171) contacts the first inner peripheral wall (311).

10. A valve device, It is characterized in that A valve seat assembly comprising any one of claims 1 to 9, wherein the valve device further comprises a valve needle (4) and a valve body (2), at least a portion of the valve needle (4) is located in the first hole (31), the valve needle (4) extends axially along the first hole (31), the valve body (2) is fixedly connected to the valve seat (3), the valve body (2) comprises a second hole (21), the valve mouth portion (1) and at least a portion of the valve seat (3) are located in the second hole (21), at least a portion of the sealing ring (5) contacts the inner wall of the second hole (31), and the sealing ring (5) is in a compressed state.

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