CN120042931A - Valve seat assembly and valve device - Google Patents

Abstract

The valve seat assembly and the valve device comprise a valve opening and a valve main body, at least part of the valve opening is formed by insert injection molding of the valve seat, at least one of the valve opening and the valve seat comprises a concave part, at least one of the valve opening and the valve seat comprises an embedded part, and the embedded part is positioned in the concave part, so that assembly errors are reduced, and further improvement of inner leakage prevention performance of the valve seat assembly is facilitated.

Description

Valve seat assembly and valve device

Technical Field

The present invention relates to control elements, and more particularly to valve seat assemblies and valve devices.

Background

The valve device comprises a sealing ring, the sealing ring comprises a valve port, the sealing ring and other parts are assembled, and the material characteristic of the sealing ring is utilized to improve the inner leakage prevention performance of the valve. However, the assembly mode of the sealing ring and other parts is easy to generate assembly errors, so that the problem of poor internal leakage prevention performance of the valve is caused.

Disclosure of Invention

The invention aims to provide a valve seat assembly and a valve device, which are beneficial to improving the inner leakage prevention performance of the valve seat assembly.

In order to achieve the above purpose, the invention adopts the following technical scheme:

The invention provides a valve seat assembly, which comprises a valve port part and a valve seat, wherein the valve port part is provided with a valve port, the valve seat is provided with a first hole, the first hole extends along the axial direction of the valve seat, at least one part of the valve port part is positioned in the first hole, at least one part of the valve port part is formed by injection molding with the valve seat as an insert, at least one of the valve port part and the valve seat comprises a concave part, and at least one of the valve port part and the valve seat comprises an embedded part, and the embedded part is positioned in the concave part.

In the valve seat assembly and the valve device provided by the embodiment of the invention, at least part of the valve opening is formed by injection molding with the valve seat as an insert, at least one of the valve opening and the valve seat comprises the concave part, at least one of the valve opening and the valve seat comprises the embedded part, and the embedded part is positioned in the concave part, so that the assembly error is reduced, and the inner leakage prevention performance of the valve seat assembly is further improved.

Drawings

Fig. 1 is a schematic perspective view of a valve device according to a first embodiment;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of a partially enlarged structure at "A" in FIG. 2;

FIG. 4 is a schematic perspective view of the valve body of FIG. 1 with the valve body removed;

FIG. 5 is a schematic diagram of the explosive structure of FIG. 4;

FIG. 6 is a schematic perspective view of the valve seat of FIG. 4;

FIG. 7 is a schematic cross-sectional view of the valve seat of FIG. 4;

FIG. 8 is a schematic perspective view of the valve port of FIG. 4;

FIG. 9 is a schematic cross-sectional view of the valve port of FIG. 4;

Fig. 10 is a schematic cross-sectional structure of a valve device provided in the second embodiment;

FIG. 11 is a schematic view of a partially enlarged structure at "B" in FIG. 10;

FIG. 12 is a schematic cross-sectional view of the valve seat of FIG. 10;

FIG. 13 is a schematic cross-sectional view of the valve port of FIG. 10;

fig. 14 is a schematic cross-sectional structure of a valve device provided in the third embodiment;

FIG. 15 is a partially enlarged schematic view of the structure of FIG. 14 at "C";

FIG. 16 is a schematic cross-sectional view of the valve seat of FIG. 14;

FIG. 17 is a schematic cross-sectional view of the valve port of FIG. 14;

Fig. 18 is a schematic cross-sectional structure of a valve device provided in the fourth embodiment;

FIG. 19 is a schematic view of a partially enlarged structure at "D" in FIG. 18;

FIG. 20 is a schematic cross-sectional view of the valve seat of FIG. 18;

FIG. 21 is a schematic cross-sectional view of the valve port of FIG. 18;

fig. 22 is a schematic cross-sectional view of the mold provided in the present embodiment;

FIG. 23 is a schematic cross-sectional view of the module of FIG. 22;

FIG. 24 is a schematic cross-sectional view of the first die holder of FIG. 12;

FIG. 25 is a schematic cross-sectional view of the second and third die holders of FIG. 12;

100. A valve; 200, a die; 1, a valve port part; 2, valve body, 3, valve seat, 4, valve needle, 5, seal ring, 6, module, 7, cavity, 8, seal groove, 11, valve port, 12, first insert, 13, second recess, 14, first tube segment, 15, second tube segment, 16, third tube segment, 171, first outer peripheral wall, 172, fifth end wall, 173, sixth end wall, 174, third outer peripheral wall, 175, second end wall, 111, first taper hole segment, 112, straight hole segment, 113, second taper hole segment, 141, drainage surface, 121, fourth outer peripheral wall, 131, second groove, 132, third groove, 133, third limit hole, 134, first annular portion, 135, second annular portion, 1321, fourth inner peripheral wall, 1331, fifth inner peripheral wall, 21, second hole, 22, second inner peripheral wall, 31, first hole, 32, first recess, 33, second insert, 34, small hole segment, 35, medium hole, 36, second outer peripheral wall, 37, second peripheral wall, 38, second peripheral wall, 37, second peripheral wall, 132, third groove, 133, third limit hole segment, 134, first annular portion, 135, first annular portion, second annular portion, 33, second annular portion, third annular portion, 33, second insert, third annular portion, 35, second annular portion, third annular portion, fourth annular portion, 13, second annular portion, fourth annular portion, fourth annular portions, fourth annular portions, fifth, fourth, the, the.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments below:

It should be noted that, current valve device includes valve main part, sealing washer and needle, the valve main part includes the mounting hole, the sealing washer is installed in the mounting hole, the sealing washer adopts elastic material to make, the sealing washer includes the valve port, the valve main part is assembled by a plurality of parts and forms, a plurality of parts refer to the part that is not less than two, a plurality of parts cooperation form foretell mounting hole, a plurality of part cooperation structures include at least one among screw-thread fit and welded fit, so that install the sealing washer in the mounting hole through equipment sealing washer and a plurality of parts, needle sliding connection valve main part, through sliding the needle, the valve port can be shutoff or open to the needle. However, the structure assembled by using the sealing ring and the valve body is easy to generate assembly errors, the assembly errors comprise at least one of, but not limited to, sealing ring dimension errors, part dimension errors, assembly tool errors, assembly measuring tool errors, assembly operation errors and assembly environment errors, the assembly tool comprises at least one of, but not limited to, a hammer, a spanner, a clamp and a screw driver, the assembly measuring tool errors comprise at least one of, but not limited to, a ruler, a distance sensor and a force sensor, the assembly operation comprises at least one of, but not limited to, identifying whether the assembly precision meets the standard by human sense, and the assembly environment comprises at least one of, but not limited to, temperature, humidity, air pressure, vibration and electromagnetic field during assembly. Moreover, with the operation and use of the valve, additional errors are caused by deformation and abrasion of the sealing ring and the plurality of parts, the additional errors further aggravate assembly errors, the internal leakage prevention performance of the valve is more unstable, and the valve is more likely to have the problem of internal leakage. Due to the above-mentioned assembly errors, there is a high possibility that a large gap is generated between the plurality of parts of the valve main body, a large gap is generated between the seal ring and the valve main body, and the sealing effect of the valve needle to the valve port is reduced, which results in a failure of the seal inside the valve, that is, the leak-proof performance of the valve is far from expectations.

Based on the above technical problems, as shown in fig. 1 to 21, the present embodiment provides a valve seat assembly 100 including a valve opening portion 1, a valve seat 3, and a seal ring 5.

As shown in fig. 9, 13, 17 and 21, the valve port portion 1 has a valve port 11, and the valve port 11 is a passage through which medium flows. The medium includes, but is not limited to, at least one of R134a, R134yf, propane, ammonia, water, ethylene glycol, refrigerator oil.

The valve opening part 1 is made of plastic, the valve opening part 1 made of plastic has the characteristic of softness, the plastic of which the valve opening part 1 is made of at least one of rubber, polytetrafluoroethylene, polypropylene and polyethylene, the material of the valve seat 3 comprises at least one of stainless steel, aluminum alloy and copper, and the softness of the valve opening part 1 is better than that of the valve seat 3. When the valve needle 4 closes the valve port 11, the valve port 11 and the valve needle 4 form a soft sealing structure, and the sealing performance of the valve needle 4 and the valve port 1 is improved by utilizing the material characteristic of the valve port 1.

As shown in fig. 9, the valve port 11 has a first tapered bore section 111. When the valve needle 4 closes the valve port 11, at least a part of the valve needle 4 contacts with the inner wall of the first taper hole section 111, the valve port part 1 plays a role in supporting the valve needle 4 obliquely, the sealing performance of the valve port 11 and the valve needle 4 is further improved, and the problem that the valve needle 4 generates stress concentration on the valve port part 1 to cause deformation or even fracture of the valve port part 1 is avoided.

The valve port 11 also has a straight bore section 112 and a second tapered bore section 113, the first tapered bore section 111 communicating with the straight bore section 112, the straight bore section 112 communicating with the second tapered bore section 113. The aperture of one end of the first taper hole section 111 is larger than the aperture of the other end of the first taper hole section 111, the apertures of the two ends of the straight hole section 112 are basically consistent, and the aperture of one end of the second taper hole section 113 is larger than the aperture of the other end of the second taper hole section 113. One end of the first taper hole section 111 with smaller aperture is communicated with one end of the straight hole section 112, and one end of the second taper hole section 113 with smaller aperture is communicated with the other end of the straight hole section 112. The larger diameter end of the first tapered bore section 111 is smaller than the larger diameter end of the second tapered bore section 113. During the insert injection molding of the valve port portion 1 with the valve seat 3, the valve port 11 is designed so that the mold 200 is easily separated from the valve port portion 1, i.e., the demolding of the valve port portion 1 is facilitated. Unexpectedly, the first taper hole section 111, the straight hole section 112 and the second taper hole section 113 form a pipeline with a bore diameter which is contracted and then gradually enlarged, if flowing medium passes through the valve port 11, the flowing medium generates a Venturi effect in the valve port 11, and the shape of the valve port 11 improves the flow regulation precision, the energy saving effect and the silencing effect of the valve device.

As shown in fig. 9, the valve port 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 first tapered hole section 111 described above, the second pipe section 15 includes the straight hole section 112 described above, the third pipe section 16 includes the second tapered hole section 113 described above, the first pipe section 14, the second pipe section 15, and the third pipe section 16 are of a unitary structure, the first pipe section 14 is located in the second pipe section 15, and the second pipe section 15 is located in the third pipe section 16.

As shown in fig. 3, 11, 15 and 19, the valve port portion 1 includes a drainage surface 141, the drainage surface 141 being located in the first hole 31, the drainage surface 141 contacting an inner wall forming the valve port 11, and the drainage surface 141 serving as a drainage function for flowing medium introduced into the valve port 11 when the flowing medium flows onto the drainage surface 141. In particular, the drainage surface 141 is located at the end of the first tube section 14. The shape of the drainage surface 141 is an annular surface, the inner wall forming the valve port 11 contacts the inner side of the drainage surface 141, and the first inner peripheral wall 311 contacts the outer side of the drainage surface 141, so that the drainage effect of the drainage surface 141 is further improved.

As shown in fig. 5, 6, 12, 16 and 20, the valve seat 3 is of a unitary structure, the valve seat 3 has a first hole 31, at least a portion of the valve opening portion 1 is located in the first hole 31, the valve opening portion 1 includes a first outer peripheral wall 171, an inner wall forming the first hole 31 includes a first inner peripheral wall 311, at least a portion of the first outer peripheral wall 171 contacts the first inner peripheral wall 311, and the valve opening portion 1 and the valve seat 3 are closely fitted, improving the leak-proof performance of the valve device.

As shown in fig. 2,10, 14 and 18, at least a portion of the first hole 31 communicates with the valve port 11, and at least a portion of the first hole 31 and the valve port 11 form a passage through which a medium flows. At least a portion of the valve needle 4 is positioned within the first bore 31 to facilitate opening or closing of the valve port 11 by the valve needle 4 within the valve seat 3. The first hole 31 penetrates the valve seat 3, and facilitates clamping or releasing at least a part of the mold 200 to or from the valve seat 3 during injection molding of the valve seat 3 of the valve opening 1.

As shown in fig. 6,7, 13, 17 and 21, at least 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 insert portion, the insert portion being located in the recess so that the valve port portion 1 and the valve seat 3 are fitted. The engaging structure of the engaging portion and the recess includes, but is not limited to, at least one of a plug structure and a snap structure. The jogged structure of valve port portion 1 and disk seat 3 has improved the connection stability of valve port portion 1 and disk seat 3, avoids taking place the problem of pine and deformation between valve port portion 1 and the disk seat 3. The valve portion 1 is of a unitary structure, the valve seat 3 is also of a unitary structure, and the valve portion 1 may be formed by an injection molding process, or at least one of, but not limited to, an injection molding process, an extrusion molding process, a calendaring process, a lamination molding process, and a compression molding process of plastic. The plastic is elastic, easy to thermoplastic process, corrosion resistant and mechanically strong, including but not limited to at least one of TPE, PP, PVC and PU. In the process that the valve port part 1 takes the valve seat 3 as an insert injection molding, plastic in a melt state is embedded into the valve seat 3 and then solidified into the valve port part 1, so that an integrated structure of the valve port part 1 and the valve seat 3 is manufactured, the number of parts of the valve seat 3 is reduced, a complex assembly structure is omitted, the assembly process of the valve device is simpler and easier, the production and manufacturing cost is reduced, and in addition, the connecting structure of the valve port part 1 and the valve seat 3 is more stable and compact, and the internal leakage prevention performance of the valve device is further improved.

As shown in the drawings, 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 insert portion includes a first insert portion 12, the first insert portion 12 extends along the radial direction of the valve port 11, the first insert portion 12 is located in the first recess 32, and the first insert portion 12 and the first recess 32 are engaged with each other, so that the connection stability between the valve port portion 1 and the valve seat 3 is further improved. The fitting structure of the first recess 32 and the first insertion portion 12 includes, but is not limited to, at least one of a plug structure and a snap structure.

In some embodiments, the mating structure of the first recess 32 and the first insert 12 is a plug structure. At least a portion of the first insert 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.

If the shape of the first concave portion 32 includes a groove, the groove of the first concave portion 32 is a first opening formed in the inner wall of the first hole 31, that is, in the first inner peripheral wall 311, and at least a part of the first fitting portion 12 is located in the first opening. As shown in fig. 11 to 13, in some embodiments, the first opening is an annular groove 323, the radial direction of the annular groove 323 is the extending direction of the first concave portion 32, the annular groove 323 is located on the inner wall forming the first hole 31, the annular groove 323 and the first hole 31 are integrally stepped holes, the first hole 31 includes two small hole sections 34, the annular groove communicates with the two small hole sections 34, the two small hole sections 34 are located at two ends of the annular groove 323, the aperture of the annular groove 323 is larger than that of the small hole sections 34, at least a part of the first embedded portion 12 is annular and located in the annular groove 323, and the connection stability of the valve port portion 1 and the valve seat 3 is improved. 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 located at both ends of the first inner peripheral wall 311, respectively, the first insertion 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 located at both ends of the first outer peripheral wall 171, at least a portion of the third end wall 312 contacts the fifth end wall 172, at least a portion of the fourth end wall 313 contacts the sixth end wall 173, the sealing structure of the valve port portion 1 and the valve seat 3 is more complicated, and the inner leakage preventing performance of the valve device is further improved. In some embodiments, the fifth end wall 172 and the drainage surface 115 are located on the same end surface of the valve portion 1, with a portion of the end surface being the fifth end wall 172 and another portion of the end surface being the drainage surface 115.

As shown in fig. 19-21, in some embodiments, the first port has a first slot 321, and at least a portion of the first insert 12 is located within the first slot 321. The inner wall forming the first groove 321 includes a third inner peripheral wall 3211, the third inner peripheral wall 3211 is formed at the first inner peripheral wall 311, the first groove 321 communicates with the first hole 31, the outer wall of the first insertion portion 12 includes a fourth outer peripheral wall 121, the fourth outer peripheral wall 121 is formed at the first outer peripheral wall 171, and at least a portion of the fourth outer peripheral wall 121 contacts the third inner peripheral wall 3211.

If the shape of the first recess 32 includes a hole, the hole of the first recess 23 has not only a first port but also a second port, the first port is communicated with the second port, the second port is located on the outer wall of the valve seat 3, 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 or is recessed relative to the outer wall of the valve seat 3, the second port can be used as a gate in the process of injection molding the valve seat 3 of the valve port portion 1, the plastic in a melt state can flow into the second port, the first port and the first hole 31 through the second port, and then the valve port portion 1 is solidified, and the communicating structure of the first port, the first port and the second port is convenient to manufacture the valve port portion 1 with an integral structure.

As shown in fig. 3 to 9 and 15 to 17, 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 insert portion 12 is convex on the valve port portion 1, the valve port portion 1 has a substantially tubular overall shape, the first insert portion 12 extends to the radially outer side of the valve port portion 1, and at least a part of the first insert portion 12 is located in the second limiting hole 322. The inner wall forming the second limiting hole 322 includes a sixth inner circumferential wall 3221, the sixth inner circumferential wall 3221 is formed in the first inner circumferential wall 311, the fourth outer circumferential wall 121 is formed in the first outer circumferential wall 171, and at least a portion of the sixth inner circumferential wall 3221 is located in the first outer circumferential wall 171. As shown in fig. 3, the whole first embedded portion 12 is located in the second limiting hole 322, the outer wall of the first embedded portion 12 is flush with the outer wall of the valve seat 3, so that the problem that the surface of the valve seat 3 is uneven due to protrusion of the first embedded portion 12 is avoided, the first embedded portion 12 and the second limiting hole 322 are matched, 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 countersunk hole, and the connection stability of the valve opening 1 and the valve seat 3 can be further improved by adopting the second limiting hole 322 with at least one of the stepped hole and the countersunk hole. The second limiting hole 322 is communicated with the first hole 31, in the process that the valve port part 1 takes the valve seat 3 as an insert injection molding, the second limiting hole 322 can be used as a pouring gate, plastic in a melt state can flow into the first hole 31 and the second limiting hole 322 through the second limiting hole 322 and then be solidified into the valve port part 1, and the communicated structure of the first hole 31 and the second limiting hole 322 is convenient for manufacturing the valve port part 1 with an integrated structure. The first embedded part 12 is matched with the second limiting hole 322, the cross section of the second limiting hole 322 is rectangular, the connection stability of the valve port part 1 and the valve seat 3 is further improved, and in the process that the valve port part 1 takes the valve seat 3 as an insert injection molding, the valve port part 1 and the valve seat 3 with good connection stability are convenient to demould.

As shown in fig. 6, in some embodiments, at least two second limiting holes 322 are provided, and more than two second limiting holes 322 are uniformly arranged on the valve seat 3 around the first hole 31. The number of the first insertion portions 12 is at least two, the two or more first insertion portions 12 are uniformly arranged in the valve opening portion 1 with the second pipe section 15 as a center, and the two or more first insertion portions 12 are respectively positioned in the two or more second limiting holes 322, so that the connection stability of the valve opening portion 1 and the valve main body 2 is further improved. In addition, in the insert injection molding process of the valve port portion 1 with the valve seat 3 as an insert, the plurality of second limiting holes 322 correspond to a plurality of gates, so that the first holes 31 are filled with the plastic in a melt state rapidly and uniformly.

As shown in fig. 9, in some embodiments, the outer diameter of the first pipe section 14, the outer diameter of the second pipe section 15, and the outer diameter of the third pipe section 16 are identical, whereby it is known that the wall thickness of the second pipe section 15 is not smaller than the wall thickness of the first pipe section 14, the wall thickness of the second pipe section 15 is not smaller than the wall thickness of the third pipe section 16, the wall thickness of the second pipe section 15 is larger, and it is considered that the second pipe section 15 having a larger wall thickness is a later cured portion on the valve portion 1. At least a part of the first embedded part 12 is positioned on the second pipe section 15 so as to be beneficial to manufacturing the valve opening part 1 through a plastic molding process, and in the process of taking the valve seat 3 as an insert for injection molding of the valve opening part 1, the plastic in a melt state firstly enters the position of the second pipe section 15 through the second limiting hole 322 so as to be beneficial to solidification of the plastic in the melt state in the first hole 31 to form the valve opening part 1, and pressure maintaining, flowing, exhausting and feeding in the plastic molding process are also beneficial to avoiding shrinkage cavity or surface defect of the valve opening part 1. The first tube section 14 has a smaller tube length than the second tube section 15, the second tube section 15 has a smaller tube length than the third tube section 16, and at least a portion of the first insert 12 is located in the third tube section 16 to facilitate the manufacture of the valve portion 1 by a plastic molding process.

As shown in the drawing, in some embodiments, the recess includes a second recess 13, the second recess 13 is formed in the valve port portion 1, the second recess 13 extends in the axial direction of the valve port 11, the insertion portion includes a second insertion portion 33, the second insertion portion 33 is formed in the valve seat 3, the second insertion portion 33 extends in the axial direction of the second hole 211, the second insertion portion 33 is located in the second recess 13, and the second insertion portion 33 is engaged with the second recess 13. The fitting structure of the second fitting portion 33 and the second recess portion 13 includes, but is not limited to, at least one of a plug structure and a snap structure.

As shown, in some embodiments, the connection structure of the second embedded portion 33 and the second recess portion 13 is a plug-in structure, and at least a portion of the second embedded portion 33 is located in the second recess portion 13. The shape of the second recess 13 has, but is not limited to, at least one of a groove and a hole.

As shown in fig. 15 to 17, 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 an extension square of the second recess 13, at least a portion of the second insert 33 is located in the second groove 131, at least a portion of the first outer peripheral wall 171 is located on an inner wall forming the second groove 131, and at least a portion of the first inner peripheral wall 311 contacts the inner wall forming the second groove 131, so as to facilitate manufacturing and processing to obtain the valve opening 1 and the valve seat 3.

As shown in fig. 15-17, in some embodiments, 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 being located within the second ring portion 135, the valve port 11 being formed in the first ring portion 134, at least a portion of the first ring portion 134 contacting an inner wall forming the first bore 31, at least a portion of the second ring portion 135 contacting an outer wall of the valve seat 3, further providing an internal leakage protection of the valve port portion 1 and the valve seat 3.

As shown in fig. 18 to 21, in some embodiments, some second concave portions 13 may also extend radially along the valve port 11, some second embedded portions 33 extend radially along the first hole 31, the shape of the second concave portions 13 has a hole, the hole of the second concave portions 13 includes a third limiting hole 133, and the axial direction of the third limiting hole 133 is the extending direction of the second concave portions 13, and at least a portion of the second embedded portions 33 is located in 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 embedded portion 33 includes a fifth outer peripheral wall 331, the fifth outer peripheral wall 331 is formed on the first inner peripheral wall 311, and at least a portion of the fifth outer peripheral wall 1331 contacts the fifth outer peripheral wall 331.

As shown in fig. 15-17, in some embodiments, some of the second recesses 13 may also extend radially of the valve port 11, some of the second inserts 33 extend radially of the first bore 31, the second recesses 13 have third grooves 132, and at least a portion of the second inserts 33 are located within the third grooves 132. The inner wall forming the third groove 132 includes a fourth inner peripheral wall 1321, the fourth inner peripheral wall 1321 is formed at 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 at the first inner peripheral wall 311, and at least a portion of the fifth outer peripheral wall 331 contacts the fourth inner peripheral wall 1321.

As shown in fig. 2, 10, 14 and 18, 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 form a stepped hole, the valve needle 4 can fully contact the valve port portion 1, the soft sealing performance of the valve port portion 1 and the valve needle 4 is improved, one end of the valve port 11 is located in the first hole 31, the end of the valve port 11 can contact the valve needle 4, the aperture of the end of the valve port 11 is the aperture of the valve port 11, and specifically, the end of the valve port 11 refers to the end with a larger aperture of the first taper hole segment 131. In some embodiments, the aperture of the valve port 11 is also smaller than the aperture of the small bore section 34, improving the soft sealing performance of the valve port portion 1 and the valve needle 4.

At least one of the valve port portion 1 and the valve seat 3 has a seal groove 8, and the seal groove 8 may be formed in the valve port portion 1, the valve seat 3, or both the valve port portion 1 and the valve seat 3. The inner wall forming the seal groove 8 includes a first peripheral wall extending to the first end wall 37 and the second end wall 175, a first end wall 37 and a second end wall 175, the first end wall 37 and the second end wall 175 being disposed in a gap, and at least a portion of the seal ring 8 being located in the gap of the first end wall 37 and the second end wall 175.

In some embodiments, the seal groove 8 is formed in 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 peripheral wall is formed in at least one of the valve port portion 1 and the valve seat 3, and may be formed in the valve port portion 1, the valve seat 3, or the valve port portion 1 and the valve seat 3. The sealing ring 8, the valve port part 1 and the valve seat 3 form a sealing structure, and the internal leakage prevention performance of the valve device is further improved.

As shown in fig. 3, in some embodiments, a first peripheral wall is formed at the valve port portion 1, the first peripheral wall being a portion of the first peripheral wall 171, a first end wall 37 is formed at an end of the valve seat 3, a second end wall 175 extends radially outward of the valve port portion 1, and the second end wall 175 contacts the first peripheral wall 171.

As shown in fig. 15 and 16, in some embodiments, a first peripheral wall is formed at the valve seat 3, the first peripheral wall being a sixth peripheral wall 38, the sixth peripheral wall 38 being formed at an outer wall of the valve seat 3, the first end wall 37 extending radially outward of the sixth peripheral wall 38, the first end wall 37 contacting the sixth peripheral wall 38.

As shown in fig. 3, the valve seat 3 has a substantially tubular overall shape, the valve seat 3 includes a medium hole 35, the medium hole 35 extends in a radial direction of the valve seat 3, the medium hole 35 communicates with the first hole 31, and the medium hole 35, the first hole 31, and the valve port 11 constitute a passage through which a medium flows. 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 from the second limiting hole 322, and in the process of injection molding the valve port part 1 with the valve seat 3 as an insert, leakage of plastic in a melt state through the medium hole 35 is avoided.

At least two medium holes 35 are provided, and more than two medium holes 35 are uniformly arranged on the valve seat 3 with the first hole 31 as a center, and medium can flow into the first hole 31 and the valve port 11 through more than two medium holes 35, so that the stability of medium flow is improved. As shown in fig. 6 and 7, in some embodiments, the number of the dielectric holes 35 is four, wherein the directions of the holes of one pair of dielectric holes 35 are consistent, the directions of the holes of the other pair of dielectric holes 35 are consistent, and in the process of machining the valve seat 3, the drill bit can open one pair of dielectric holes 35 at a time, so that the four dielectric holes 35 can be completed through only two drilling steps.

As shown in fig. 1 to 3, the present embodiment also provides a valve device including the above-described valve seat assembly, and further including a valve body 2 and a needle 4.

The valve body 21 has a second hole 211, at least a part of the valve seat 3 and the valve opening portion 1 are located in the second hole 211, an inner wall forming the second hole 211 includes a second inner circumferential wall 212, the valve seat 3 includes a second outer circumferential wall 36, at least a part of the second outer circumferential wall 36 contacts the second inner circumferential wall 212, the valve opening portion 1 includes a third outer circumferential wall 174, at least a part of the third outer circumferential wall 174 is located in the second inner circumferential wall 212, the valve body 21 and the valve seat 3 constitute a sealing structure, the valve body 21 and the valve opening portion 1 constitute a sealing structure, and the leak-proof performance of the valve device is further improved.

At least a portion of the seal ring 5 contacts the second inner peripheral wall 212, and the seal ring 5 is in a compressed state, further improving the leak-proof performance of the valve device.

The valve needle 4 is slidable relative to the valve opening 1, the valve needle 4 extends along the axial direction of the valve port 11, if the valve needle 4 slides relative to the valve opening 1, the valve needle 4 can open or close the valve port 11, and the opening degree of the valve port 11, namely the opening degree of the valve port 11, can be adjusted by sliding the valve needle 4, so that the adjustment of the flow rate of the medium by the valve is realized.

As shown in fig. 2, 10, 14 and 18, the valve needle 4 includes the first taper rod section 41, the taper of the first taper rod section 41 is substantially identical to the taper of the first taper 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 taper rod section 41 contacts the inner wall forming the first taper hole section 111, the outer peripheral wall of the first taper rod section 41 fully contacts the inner wall forming the first taper hole section 111, and the sealing performance of the valve port 11 and the valve needle 4 and the oblique supporting function of the valve port portion 1 on the valve needle 4 are further improved.

As shown in fig. 22 to 25, the present embodiment further provides a mold 200 for preparing the valve opening 1 on the valve seat 3 of the valve 100, including the valve seat 3, and further including the die set 6, where the valve seat 3 and the die set 6 are cooperatively disposed, and the valve seat 3 and the die set 6 are cooperatively formed with a cavity 7, and the second limiting hole 322 is communicated with the cavity 7. In the process of injection molding by taking the valve seat 3 as an insert of the valve port part 1, plastic in a melt state can be injected into the cavity 7 through the second limiting hole 322, the plastic in the melt state can be solidified into the valve port part 1 in the cavity 7, and after solidification, the valve seat 3 and the die set 6 are separated to obtain the valve port part 1 and the valve seat 3 which are arranged in a jogged mode.

The module 6 includes a first die holder 61, the first die holder 61 is located on the valve seat 3, at least a portion of the first die holder 61 is located in the first hole 31, the first die holder 61 includes a first parting surface, the first parting surface is located in the first hole 31, the first parting surface is further located in the first inner peripheral wall 311, and after the valve port portion 1 is solidified in the process of injection molding the valve seat 3 as an insert in the valve port portion 1, the drainage surface 141 is located in the first parting surface.

The die set 6 further includes a first mandrel 64, where the first mandrel 64 and the first die holder 61 are cooperatively disposed, and at least a portion of the first mandrel 64 is located in the first taper hole section 111 after the valve port portion 1 is cured in the process of injection molding the valve port portion 1 with the valve seat 3 as an insert.

As shown in fig. 24, the first die holder 61 includes a first core hole 611, and a portion of the first mandrel 64 is located in the first core hole 611, and the first mandrel 64 can be inserted into or removed from the first core hole 611 during injection molding of the valve seat 3 of the valve opening portion 1, so as to facilitate the clamping and the stripping of the die 200.

The die set 6 further comprises a second die holder 62 and a third die holder 63, the second die holder 62 and the third die holder 63 are located on the valve seat 3, the second die holder 62 and the valve seat 3 are matched, the second die holder 62 and the third die holder 63 are matched, the first die holder 61 is plugged at one end of the first hole 31, and the second die holder 62 and the third die holder 63 are plugged at the other end of the second hole 211. In the process of injection molding the valve port portion 1 with the valve seat 3 as an insert, the second die holder 62 and the third die holder 63 are assembled and disassembled to facilitate the die assembly and the die disassembly of the die 200.

As shown in fig. 25, the die set 6 further includes a second mandrel 65, one end of the second mandrel 65 is located at one end of the first mandrel 64, and at least a portion of the second mandrel 65 is located in the second tapered section 113 of the valve port portion 1 during injection molding of the valve port portion 1 with the valve seat 3 as an insert. The second core shaft 65 is matched with the second die holder 62 and the third die holder 63, the second die holder 62 and the third die holder 63 comprise a second core hole 66, the second die holder 62 and the third die holder 63 are matched to form the second core hole 66, and in the process of injection molding of the valve port part 1 by taking the valve seat 3 as an insert, the second core shaft 65 is inserted into or separated from the second core hole 66, so that the die 200 can be conveniently assembled and disassembled.

The present embodiment also provides a method for manufacturing the valve 100, wherein the valve port portion 1 and the valve seat 3 which are embedded are manufactured on the valve seat 3 of the valve 100 by using the mold 200, and the method comprises the following steps:

Closing the die set 6 and the valve seat 3;

injecting plastic in a melt state into a cavity 7 formed by matching the die set 6 with the valve seat 3 through a second limiting hole 322;

Solidifying the plastic in a melt state to obtain a valve opening part 1;

the die set 6, the valve seat 3 and the valve opening 1 are released to obtain the valve opening 1 and the valve seat 3 which are fitted.

It should be noted that the above-mentioned embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention can be modified or substituted by equivalent ones, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. A valve seat assembly comprising a valve port portion (1) and a valve seat (3), the valve port portion (1) having a valve port (11), the valve seat (3) having a first bore (31), the first bore (31) extending axially of the valve seat (3), at least a portion of the valve port portion (1) being located in the first bore (31), at least a portion of the valve port portion (1) being injection molded with the valve seat (3) as an insert, at least one of the valve port portion (1) and the valve seat (3) comprising a recess, at least one of the valve port portion (1) and the valve seat (3) comprising an insert portion, the insert portion being located in the recess.

2. The valve seat assembly according to claim 1, wherein the recess comprises a first recess (32), the first recess (32) being formed in the valve seat (3), the first recess (32) extending in a radial direction of the first hole (31), the insert portion comprising a first insert portion (12), the first insert portion (12) being formed in the valve port portion (1), the first insert portion (12) extending in a radial direction of the valve port (11), the first insert portion (12) being located in the first recess (32).

3. Valve according to claim 2, characterized in that the first recess (32) has a first mouth located at an inner wall forming the first hole (31), at least a portion of the first insert (12) being located at the first mouth.

4. A valve according to claim 3, wherein the first recess (32) has a second port, the first port communicating with the second port, the second port being located on an outer wall of the valve seat (3), the outer wall of the first insert (12) being flush with the outer wall of the valve seat (3) or protruding with respect to the outer wall of the valve seat (3).

5. A valve according to any one of claims 1 to 4, wherein the recess comprises a second recess (13), the second recess (13) being formed in the valve port portion (1), the second recess (13) extending in an axial direction of the valve port (1), the insert portion comprising a second insert portion (33), the second insert portion (33) being formed in the valve seat (3), the second insert portion (33) extending in an axial direction of the second hole (31), the second insert portion (33) being located in the second recess (13).

6. The valve seat assembly of claim 5, wherein 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) being located within the second ring portion (135), the first ring portion (134) extending in an axial direction of the valve port (11), the second ring portion (135) extending in an axial direction of the valve port (11), the valve port (11) being formed in the first ring portion (134), at least a portion of the first ring portion (134) contacting an inner wall forming the first aperture (31), at least a portion of the second ring portion (135) contacting an outer wall of the valve seat (3).

7. The valve seat assembly according to claims 1 to 6, characterized in that the valve seat assembly comprises a sealing ring (5), at least one of the valve port portion (1) and the valve seat (3) has a sealing groove (8), an inner wall forming the sealing groove (8) comprises 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), the first end wall (37) and the second end wall (175) are arranged in a gap, and at least a part of the sealing ring (5) is located in the gap of the first end wall (37) and the second end wall (175).

8. The valve according to claim 7, wherein the seal groove (5) is formed in 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 peripheral wall is formed in at least one of the valve seat (3) and the valve port portion (1).

9. The valve according to any one of claims 1 to 8, wherein an inner wall forming the first hole (31) includes a first inner peripheral wall (311), 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 characterized by comprising a valve seat assembly according to any one of claims 1 to 9, further comprising a valve needle (4) and a valve body (2), at least a portion of the valve needle (4) being located in the first bore (31), the valve needle (4) extending axially along the first bore (31), the valve body (2) being fixedly connected to the valve seat (3), the valve body (2) comprising a second bore (21), at least a portion of the valve port portion (1) and the valve seat (3) being located in the second bore (21), at least a portion of the sealing ring (5) contacting an inner wall of the second bore (31), the sealing ring (5) being in a compressed state.