Multi-stage pressure reducing valve with corrugated pipe seal
By introducing bellows seals and a multi-stage pressure-reducing cylindrical structure into the multi-stage pressure-reducing valve, the problems of large valve core closing torque and poor sealing performance are solved, achieving the effects of small torque opening and closing, good sealing and high pressure regulation accuracy.
Patent Information
- Application Number
- CN202520798274.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-04-25
AI Technical Summary
Existing cage-type multistage pressure reducing valves experience high resistance from the high-pressure medium on the lower end face of the valve core during the closing process, resulting in a large closing torque, reduced sealing performance, and difficulty in controlling the machining accuracy of the flow channel inside the valve cage, which affects the pressure regulation accuracy.
It adopts a bellows sealing device and a multi-stage pressure-reducing cylindrical structure. A bellows seal is set between the valve stem and the valve cover. The medium flow direction is consistent with the valve core closing direction. The valve core and valve seat sealing surfaces are made of beveled hard alloy welded on. The valve cage adopts a sleeve with a multi-stage pressure-reducing cylindrical embedded in it. The radial window is formed by wire cutting.
It reduces the valve core opening and closing torque, improves sealing performance and pressure regulation accuracy, has a large sealing force, low fluid resistance, reduced noise, and high machining precision.
Smart Images
Figure CN223740194U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the valve field especially relates to a multistage pressure reducing valve. BACKGROUND
[0002] The multistate pressure reducing valve is generally used in high pressure difference working condition, and converts the import high pressure medium into the export medium with middle and low pressure through multistage pressure reduction. The cage type multistage pressure reducing valve is a common structure, the valve cage is provided with multistage inner cavities matched with multistage valve cores, the import high pressure medium is output from the export after being reduced in pressure through the multistage inner cavities, and the purpose of pressure reduction is achieved. In order to improve the sealing reliability of the middle cavity packing of the existing cage type multistage pressure reducing valve, the valve body is generally adopted with low import and high export structure, and the export low pressure medium is contacted with the packing, but the closing torque is large in the closing process of the structure because the lower end face of the valve core is subjected to large resistance of the high pressure medium, and the sealing force between the valve core and the valve seat is reduced in the closed state, and the sealing performance is reduced. In addition, the multistage inner cavities of the valve cage of the existing product are integrally processed and formed, and the processing precision of the inner cavity flow channel is difficult to control, and the pressure regulating precision is affected. SUMMARY
[0003] The utility model discloses a multistage pressure reducing valve with bellows seal, which is improved in the following aspects: the medium flow direction is consistent with the closing direction of the valve core, the sealing force between the valve core and the valve seat is improved, the operation torque is small, the sealing performance is reliable, and the pressure regulating precision is high.
[0004] The technical scheme of the utility model is realized as follows:
[0005] The utility model provides a multistage pressure reducing valve with bellows seal, comprising valve body, valve seat, valve cover, valve core, valve rod, support, the valve body has import channel and export channel, the valve seat sets up in the valve cavity between import channel and export channel, the valve cover is fixedly installed on the valve cavity upper end face in the valve body by bolt, sets up the valve cage between the valve cover lower end face and the valve seat upper end face, the support is fixedly installed on the valve cover upper end face, the valve rod upper end passes through the shaft hole of valve cover and support and is connected with the transmission device transmission on the support, and the lower end is connected with the valve core, characterized by: the bellows seal device is set up in the shaft hole between the valve rod and the valve cover, the import channel of the valve body is communicated with the valve cavity above the valve seat sealing surface, and the pressure reducing cavity is arranged between the outer cylindrical surface of the valve cage and the inner wall of the valve cavity, the valve cage is composed of the sleeve and the multistage pressure reducing cylinder, concentric radial flow channel holes are arranged on the sleeve and the upper part of the multistage pressure reducing cylinder, a plurality of radial windows with the same size are evenly arranged in the circumferential direction of the multistage pressure reducing cylinder below the radial flow channel holes, the radial windows are evenly arranged in a plurality of layers in the axial direction of the multistage pressure reducing cylinder, and the multistage pressure reducing valve cage is formed, the valve core and the valve rod adopt an integrated structure, the lower end surface of the valve core is provided with a sealing surface matched with the valve seat, the outer cylindrical surface of the valve core is provided with a multistage valve core sealing surface matched with the inner wall of the multistage pressure reducing cylinder, the axial distance between the two adjacent valve core sealing surfaces is equal to the axial distance between the corresponding positions of the two adjacent radial windows, and the multistage valve core sealing surface and the multistage pressure reducing cylinder form a multistage sealing pair.
[0006] In the above technical scheme, the valve core sealing surface is composed of a plurality of radial shoulders arranged axially on the outer cylindrical surface of the valve core, the two side annular surfaces of the radial shoulder are inclined surfaces, and the conical angle formed by the two side inclined surfaces is composed of a hard alloy deposited on the conical angle to form a wear-resistant sealing surface.
[0007] In the above technical scheme, the bellows seal device is composed of a bellows, an upper connecting seat and a lower connecting seat, the two ends of the bellows are sealingly welded with the lower end surface of the upper connecting seat and the upper end surface of the lower connecting seat respectively, the upper end radial annular shoulder of the upper connecting seat is sealingly pressed and installed between the upper end surface of the valve cover and the lower end surface of the support, and the lower end surface of the lower connecting seat is sealingly welded on the radial step of the valve rod.
[0008] The beneficial effects of the utility model compared with the prior art are as follows:
[0009] 1. The bellows seal device is arranged between the valve rod and the valve cover, high sealing function can be achieved for high-pressure medium, the import channel can be communicated with the valve cavity above the sealing surface of the valve seat, the medium pressure is the same as the closing direction of the valve core, the opening and closing torque of the valve core is greatly reduced, the sealing force between the valve core and the valve seat is increased, and the valve has the advantages of light opening and closing, good sealing performance and the like;
[0010] 2. The valve cage is composed of the sleeve and the multistage pressure reducing cylinder, the radial windows of the multistage pressure reducing cylinder are formed in neat array by wire cutting, the processing difficulty is greatly reduced, the processing size precision of the valve cage is improved, and the pressure regulating precision is high. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model.
[0012] Figure 2 This is a utility model Figure 1 A schematic diagram of the structure of the valve cage.
[0013] Figure 3 This is a utility model Figure 2 A schematic diagram of the middle sleeve.
[0014] Figure 4 This is a utility model Figure 2 A schematic diagram of the structure of a multi-stage pressure-reducing cylinder.
[0015] Figure 5 This is a utility model Figure 1 A schematic diagram of the structure of the middle valve core.
[0016] In the diagram: 1 Valve body, 2 Valve seat, 3 Inlet channel, 4 Sleeve, 5 Multi-stage pressure reducing cylinder, 6 Valve core, 7 Pressure reducing chamber, 8 Valve cover, 9 Lower connecting seat, 10 Valve stem, 11 Bellows, 12 Upper connecting seat, 13 Bracket, 14 Fixing pin, 15 Outlet channel, 16 Radial flow channel hole, 17 Radial window, 18 Valve core sealing surface, 19 Annular flow channel, 20 Sealing gasket. Detailed Implementation
[0017] like Figures 1-5The illustrated multi-stage pressure reducing valve with bellows seal comprises a valve body 1, a valve seat 2, a valve cover 8, a valve core 6, a valve rod 10, a bracket 13, the valve body 1 has an inlet channel 3 and an outlet channel 15, the valve seat 2 is arranged in the valve cavity between the inlet channel 3 and the outlet channel 15, the valve cover 8 is fixedly and sealingly installed on the upper end face of the cavity in the valve body 1, a valve cage is arranged between the lower end face of the valve cover 8 and the upper end face of the valve seat 2, the bracket 13 is fixedly installed on the upper end face of the valve cover 8, the upper end of the valve rod 10 passes through the shaft hole of the valve cover 8 and the bracket 13 and is drivingly connected with the driving device installed on the bracket 13, and the lower end is connected with the valve core 6; characterized in that: a bellows seal device is arranged in the shaft hole between the valve rod 10 and the valve cover 8, so that the middle cavity can withstand high pressure sealing; the inlet channel 3 of the valve body 1 is communicated with the valve cavity above the sealing surface of the valve seat 2, there is a pressure reducing cavity 7 between the outer cylindrical surface of the valve cage and the inner wall of the valve cavity, so that the high-pressure medium flowing from the inlet channel 3 is reduced in pressure; the valve cage is composed of a sleeve 4 and a multi-stage pressure reducing cylinder 5 embedded in the sleeve 4, concentric radial flow channel holes 16 are arranged on the sleeve 4 and the upper part of the multi-stage pressure reducing cylinder 5, a plurality of radial windows 17 of the same size are uniformly arranged in the circumferential direction of the multi-stage pressure reducing cylinder 5 below the radial flow channel holes 16, the radial windows 17 are uniformly arranged in a plurality of layers in the axial direction of the multi-stage pressure reducing cylinder 5, forming a multi-stage pressure reducing valve cage, each radial window 17 on the multi-stage pressure reducing cylinder 5 can be formed by wire cutting, the processing technology is simple, the machining precision of each radial window 17 is high, the radial window 17 can be rectangular or square, the sleeve 4 and the multi-stage pressure reducing cylinder 5 are fixedly connected by a fixing pin 14, so that the radial flow channel holes 16 of the two are aligned, the upper end face of the sleeve 4 is sealingly and press-fitted in the annular boss plane of the lower end of the valve cover 8, a guide device is arranged between the outer cylindrical surface of the valve core 6 and the inner hole of the upper end of the multi-stage pressure reducing cylinder 5, the guide device is composed of axial guide grooves arranged at corresponding positions between the outer cylindrical surface of the valve core 6 and the inner hole wall of the multi-stage pressure reducing cylinder 5 and axial keys installed in the axial guide grooves, so as to prevent the valve core 6 from radially swinging and rotating in the circumferential direction; the valve core 6 and the valve rod 10 are of an integrated structure, the lower end face of the valve core 6 is provided with a sealing surface matched with the valve seat 2, the outer cylindrical surface of the valve core 6 is provided with a multi-stage valve core sealing surface 18 dynamically sealingly matched with the inner wall of the multi-stage pressure reducing cylinder 5, the axial distance between two adjacent valve core sealing surfaces 18 is equal to the axial distance between corresponding positions of two adjacent radial windows 17 in the upper and lower directions, here, the axial distance between corresponding positions of two adjacent radial windows 17 in the upper and lower directions refers to the distance between the rectangular bottom edges of two adjacent radial windows 17 in the upper and lower directions, in the closed state of the valve core 6 and the valve seat 2, each valve core sealing surface 18 and the inner wall sealingly matched with the axially adjacent radial window 17 of the multi-stage pressure reducing cylinder 5 form a sealing pair, the multi-stage valve core sealing surface 18 and the multi-stage pressure reducing cylinder 5 form a multi-stage sealing pair, there is an annular flow channel 19 between the outer surface of the valve core 6 and the inner wall of the multi-stage pressure reducing cylinder 5, and in the open state of the valve core 6 and the valve seat 2, fluid can flow through the annular flow channel 19.
[0018] The technical effects of the technical scheme are that the middle cavity is sealed by the bellows, the high-pressure medium can pass through the radial flow channel hole 16 into the valve seat 2 from the valve cavity above the valve seat 2, the medium pressure is consistent with the closing direction of the valve core 6, the closing torque is small, the sealing force is large, and the sealing performance is good; and the multi-stage pressure reduction cylinder 5 can be formed by wire cutting, the machining precision is good, and the pressure regulating precision is high.
[0019] The valve core sealing surface 18 is composed of a plurality of radial shoulders arranged axially on the outer cylindrical surface of the valve core 6, the two side annular surfaces of the radial shoulder are inclined surfaces, and the wear-resistant sealing surface is formed by hard alloy deposited at the taper angle formed by the two side inclined surfaces.
[0020] The technical effects of the technical feature are that the valve core sealing surface 18 adopts an inclined surface, the fluid resistance is reduced, and the impact noise between the fluid and the valve core sealing surface 18 is reduced.
[0021] The bellows sealing device is composed of the bellows 11, the upper connecting seat 12 and the lower connecting seat 9, the two ends of the bellows 11 are respectively sealed and welded with the lower end surface of the upper connecting seat 12 and the upper end surface of the lower connecting seat 9, the radial annular shoulder of the upper end of the upper connecting seat 12 is sealingly pressed between the upper end surface of the valve cover 8 and the lower end surface of the support 13, the lower end surface of the lower connecting seat 9 is sealingly welded on the radial step of the valve stem 10, the upper and lower annular bosses are respectively arranged in the upper and lower planes of the radial annular shoulder of the upper connecting seat 12, the upper end surface of the valve cover 8 is provided with an annular positioning groove matched with the lower annular boss, the lower end surface of the support 13 is provided with an annular positioning groove matched with the upper annular boss, the positioning precision of the upper connecting seat 12 is improved, the eccentricity of the upper connecting seat 12 and the valve stem 10 does not affect the safety of the bellows 11, and the sealing gasket 20 is arranged between the lower annular boss and the annular positioning groove of the valve cover 8 to realize the static sealing of the middle cavity.
[0022] The technical effects of the technical feature are that the concentricity of the bellows 11 and the valve stem 10 is ensured, and the working performance of the bellows 11 is improved.
Claims
1. A multi-stage pressure reducing valve with bellows seal, comprising a valve body (1), a valve seat (2), a valve cover (8), a valve core (6), a valve stem (10), a bracket (13), the valve body (1) having an inlet channel (3) and an outlet channel (15), the valve seat (2) being arranged in the valve cavity between the inlet channel (3) and the outlet channel (15), the valve cover (8) being fixedly and sealingly installed on the upper end face of the cavity in the valve body (1), a valve cage being arranged between the lower end face of the valve cover (8) and the upper end face of the valve seat (2), the bracket (13) being fixedly installed on the upper end face of the valve cover (8), the upper end of the valve stem (10) penetrating the shaft hole of the valve cover (8) and the bracket (13) and being drivingly connected with a driving device installed on the bracket (13), the lower end being connected with the valve core (6); characterized in that: The bellows sealing device is arranged in the shaft hole between the valve stem (10) and the valve cover (8); the inlet channel (3) of the valve body (1) is communicated with the valve cavity above the sealing surface of the valve seat (2), and the pressure reduction cavity (7) is arranged between the outer cylindrical surface of the valve cage and the inner wall of the valve cavity; the valve cage is composed of the sleeve (4) and the multi-stage pressure reduction cylinder (5) embedded in the sleeve (4), concentric radial flow channel holes (16) are arranged on the sleeve (4) and the upper part of the multi-stage pressure reduction cylinder (5), a plurality of radial windows (17) with the same size are uniformly arranged in the circumferential direction of the multi-stage pressure reduction cylinder (5) below the radial flow channel holes (16), the radial windows (17) are uniformly arranged in a plurality of layers in the axial direction of the multi-stage pressure reduction cylinder (5), and the multi-stage pressure reduction valve cage is formed, the sleeve (4) and the multi-stage pressure reduction cylinder (5) are fixedly connected through the fixing pin (14), the upper end surface of the sleeve (4) is sealingly pressed in the annular boss plane at the lower end of the valve cover (8), the guide device is arranged between the outer cylindrical surface of the valve core (6) and the inner hole wall of the upper end of the multi-stage pressure reduction cylinder (5), the guide device is composed of the axial guide grooves arranged at the corresponding positions between the outer cylindrical surface of the valve core (6) and the inner hole wall of the multi-stage pressure reduction cylinder (5) and the axial keys arranged in the axial guide grooves; the valve core (6) and the valve stem (10) are in an integrated structure, the lower end surface of the valve core (6) is provided with a sealing surface matched with the valve seat (2), the outer cylindrical surface of the valve core (6) is provided with a plurality of multi-stage valve core sealing surfaces (18) matched with the inner wall of the multi-stage pressure reduction cylinder (5) for dynamic sealing, the axial distance between the adjacent two valve core sealing surfaces (18) is equal to the axial distance of the same position of the upper and lower radial windows (17), the multi-stage valve core sealing surfaces (18) and the multi-stage pressure reduction cylinder (5) form a multi-stage sealing pair, and the annular flow channel (19) is arranged between the outer cylindrical surface of the valve core (6) and the inner wall of the multi-stage pressure reduction cylinder (5). 2. The multi-stage pressure reducing valve with bellows seal according to claim 1, characterized in that: The valve core sealing surface (18) is composed of a plurality of radial shoulders arranged in the axial direction on the outer cylindrical surface of the valve core (6), the two side annular surfaces of the radial shoulder are inclined surfaces, and the wear-resistant sealing surface is formed by hard alloy deposited at the taper angle formed by the two side inclined surfaces.
3. A multi-stage pressure reducing valve with bellows seal according to claim 1 or 2, characterized in that: The bellows sealing device is composed of the bellows (11), the upper connecting seat (12) and the lower connecting seat (9), the two ends of the bellows (11) are sealingly welded with the lower end surface of the upper connecting seat (12) and the upper end surface of the lower connecting seat (9), the radial annular shoulder of the upper end of the upper connecting seat (12) is sealingly pressed between the upper end surface of the valve cover (8) and the lower end surface of the support (13), the lower end surface of the lower connecting seat (9) is sealingly welded on the radial step of the valve stem (10), the upper annular boss and the lower annular boss are respectively arranged in the upper and lower planes of the radial annular shoulder of the upper connecting seat (12), the upper end surface of the valve cover (8) is provided with the annular positioning groove matched with the lower annular boss, the lower end surface of the support (13) is provided with the annular positioning groove matched with the upper annular boss, and the sealing gasket (20) is arranged between the lower annular boss and the annular positioning groove of the valve cover (8).