A pressure reducing orifice plate and pressure reducing throttle device

Abstract

The application discloses a pressure reducing hole plate and a pressure reducing throttling device, and relates to the technical field of pressure reducing hole plates, wherein the pressure reducing hole plate comprises a circular first pressure reducing hole plate and a second pressure reducing hole plate, the first pressure reducing hole plate and the second pressure reducing hole plate are arranged in an overlapping mode, and the central axes of the first pressure reducing hole plate and the second pressure reducing hole plate are located on the same straight line; the diameter of the second pressure reducing hole plate is smaller than that of the first pressure reducing hole plate; the first pressure reducing hole plate is provided with a through hole penetrating through the two end faces of the first pressure reducing hole plate, and a plurality of first water passing grooves are arranged on the inner end face of the first pressure reducing hole plate, the first water passing grooves are in communication with the through hole and the outer circumferential surface of the first pressure reducing hole plate; the outer end face of the second pressure reducing hole plate is provided with a concave cavity in the center, and a plurality of second water passing grooves are arranged on the outer end face of the second pressure reducing hole plate, the second water passing grooves are in communication with the concave cavity and the outer circumference of the second pressure reducing hole plate. The pressure reducing hole plate has good throttling effect, can effectively shorten the length of a throttling pipe body, reduce the processing difficulty, and lower the processing cost.

Description

Technical Field

[0001] This invention belongs to the field of pressure pipeline technology, and specifically relates to a pressure reducing orifice plate and a pressure reducing and throttling device. Background Technology

[0002] A throttling device utilizes the local resistance of a pressure-reducing orifice plate when a fluid flows in a pipeline, which reduces the fluid pressure and causes energy loss.

[0003] Existing throttling devices such as Figure 1 As shown, the system includes a throttling pipe body 02, with an inlet flange 01 at the inlet end. Several pressure-reducing orifice plates 03 are spaced apart within the throttling pipe body 02, forming a buffer zone between adjacent pressure-reducing orifice plates 03. Each pressure-reducing orifice plate 03 has a plate-type structure with throttling orifices. These orifices are eccentrically positioned, and the axes of all throttling orifices on the pressure-reducing orifice plates 03 are parallel to the axis of the throttling pipe body 02. The throttling orifices on adjacent pressure-reducing orifice plates 03 are staggered. Throttling bushings 04 are provided between adjacent pressure-reducing orifice plates 03 and on the outer sides of both ends of the pressure-reducing orifice plates 03. A final-stage throttling bushing 05 is provided on the outer side of the throttling bushing 04 near the outlet end of the throttling pipe body 02. The final-stage throttling bushing 05 has a water passage hole in its center. A diffuser pipe 06 is provided at the outlet end of the throttling pipe body 02, which is used to connect to an external pipe 08. Fluid enters the throttling pipe body from the inlet end, undergoes progressive pressure reduction, and finally exits through the diffuser pipe. The throttling effect of the pressure-reducing orifice plate used in this throttling device is not significant, often requiring an increase in the number of pressure-reducing orifice plate stages, which increases the length of the throttling tube, thus increasing the processing difficulty and cost. Simultaneously, cavitation from the throttling device extends through the diffuser 06 to the external connector 08, forming a cavitation diffusion zone 07 on the external connector 08. This causes frequent ruptures of the external connector, posing a safety hazard.

[0004] Therefore, providing a pressure-reducing orifice plate with good throttling effect, shortening the length of the throttling tube, reducing processing difficulty and lowering processing cost are technical problems that those skilled in the art hope to solve. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of the present invention is to provide a pressure reducing orifice plate and a pressure reducing and throttling device. The pressure reducing orifice plate has a good throttling effect, can effectively shorten the length of the throttling tube, reduce the processing difficulty, and reduce the processing cost.

[0006] The technical solution of this invention is implemented as follows:

[0007] A pressure-reducing orifice plate includes a circular first pressure-reducing orifice plate and a second pressure-reducing orifice plate, the first pressure-reducing orifice plate and the second pressure-reducing orifice plate are overlapped and their central axes are located on the same straight line; the diameter of the second pressure-reducing orifice plate is smaller than that of the first pressure-reducing orifice plate.

[0008] The first pressure reducing orifice plate has a through hole through the two end faces of the first pressure reducing orifice plate, and a plurality of first water passing grooves are arranged on the inner end face of the first pressure reducing orifice plate, and the through hole and the outer circumferential surface of the first pressure reducing orifice plate are communicated through the first water passing grooves.

[0009] The outer end face of the second pressure reducing orifice plate is provided with a concave cavity, and a plurality of second water passing grooves are arranged on the outer end face of the second pressure reducing orifice plate, and the concave cavity and the outer circumference of the second pressure reducing orifice plate are communicated through the second water passing grooves.

[0010] Further, an annular groove is arranged on the outer circumferential surface of the first pressure reducing orifice plate for arranging an O-shaped sealing ring.

[0011] Further, all the first water passing grooves on the inner end face of the first pressure reducing orifice plate are uniformly distributed, and the first water passing grooves are arc grooves to form a spiral structure on the inner end face of the first pressure reducing orifice plate.

[0012] Further, all the second water passing grooves on the outer end face of the second pressure reducing orifice plate are uniformly distributed, and the second water passing grooves are arc grooves to form a spiral structure on the outer end face of the second pressure reducing orifice plate.

[0013] Further, the first water passing grooves on the first pressure reducing orifice plate and the second water passing grooves on the second pressure reducing orifice plate are arranged staggered.

[0014] Further, the second pressure reducing orifice plate is relatively fixedly arranged on one end face of the first pressure reducing orifice plate through a positioning pin; two first positioning holes are arranged on the inner end face of the first pressure reducing orifice plate, two second positioning holes are arranged on the inner end face of the second pressure reducing orifice plate, the second positioning holes are arranged corresponding to the first positioning holes one by one, and a positioning pin is arranged in the first positioning hole and the second positioning hole, so that the second pressure reducing orifice plate is relatively fixedly arranged on one end face of the first pressure reducing orifice plate.

[0015] The application also provides a pressure reducing and throttling device, which comprises the pressure reducing orifice plate.

[0016] Further, the throttling pipe body is provided with an inlet flange at the inlet end, a plurality of pressure reducing orifice plates are arranged in the throttling pipe body, all the pressure reducing orifice plates are arranged side by side along the longitudinal direction of the throttling pipe body, the central axis of the pressure reducing orifice plate is located on the same straight line as the central axis of the throttling pipe body, an O-shaped sealing ring is arranged in the annular groove of the first pressure reducing orifice plate, and an outlet flange is arranged at the outlet end of the throttling pipe body.

[0017] Further, a pressing flange is arranged between the outlet end of the throttling pipe body and the outlet flange.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] 1. The pressure reducing orifice plate of the present application is composed of a first pressure reducing orifice plate and a second pressure reducing orifice plate, the diameter of the first pressure reducing orifice plate is larger than that of the second pressure reducing orifice plate, thereby forming an annular groove outside the periphery of the second pressure reducing orifice plate; in use, water flows through the through hole of the first pressure reducing orifice plate and then flows from inside to outside along the first water flow groove, and then flows into the outer annular groove, thereby forming a first pressure reduction; the water in the outer annular groove flows from outside to inside along the second water flow groove of the second pressure reducing orifice plate into the concave cavity, thereby forming a second pressure reduction; in this way, the resistance loss along the way can be effectively increased, the pressure drop of the pressure reducing orifice plate can be increased, thereby increasing the throttling effect, and the length of the throttling pipe body can be effectively shortened, the processing difficulty can be reduced, and the processing cost can be reduced.

[0020] 2. The first water flow groove and the second water flow groove provided on the first pressure reducing orifice plate and the second pressure reducing orifice plate of the present application are both arc-shaped grooves, the length of the water flow groove can be further prolonged, and the throttling effect of the pressure reducing orifice plate can be increased; at the same time, the first pressure reducing orifice plate and the second pressure reducing orifice plate are positioned by the positioning pin, the water flowing through the first water flow groove can be prevented from directly entering the second water flow groove, thereby further increasing the resistance loss along the way of the pressure reducing orifice plate and improving the throttling effect.

[0021] 3. The present application provides a compression flange at the outlet end of the throttling pipe body, so that the cavitation diffusion zone is in the compression flange, thereby avoiding damage to the external connecting pipe; the compression flange can be regularly overhauled and replaced as a consumable part, thereby ensuring the normal use of the pressure reducing and throttling device; at the same time, the compression flange can be thickened to improve its cavitation resistance and ensure its service life. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 -structure diagram of the existing throttling device.

[0023] Figure 2 -structure diagram of the first pressure reducing orifice plate.

[0024] Figure 3 -structure diagram of the second pressure reducing orifice plate.

[0025] Figure 4 -structure diagram of the pressure reducing orifice plate.

[0026] Figure 5 -structure diagram of the pressure reducing and throttling device.

[0027] Wherein: 01-inlet flange; 02-throttling pipe body; 03-pressure reducing orifice plate; 04-throttling bushing; 05-final-stage throttling bushing; 06-diffusion pipe; 07-cavitation diffusion zone; 08-external connecting pipe; 09-O-shaped sealing ring; 010-compression flange; 011-outlet flange; 1-first pressure reducing orifice plate; 11-through hole; 12-first water flow groove; 13-first positioning hole; 14-annular groove; 2-second pressure reducing orifice plate; 21-concave cavity; 22-second water flow groove. DETAILED DESCRIPTION

[0028] The application will be described in further detail below with reference to the drawings and specific embodiments.

[0029] Reference Figures 2-4 A pressure reducing orifice comprises a circular first pressure reducing orifice 1 and a second pressure reducing orifice 2, the first pressure reducing orifice 1 and the second pressure reducing orifice 2 are arranged in an overlapping manner and the central axes of the first pressure reducing orifice 1 and the second pressure reducing orifice 2 are located on the same straight line; the diameter of the second pressure reducing orifice 2 is smaller than that of the first pressure reducing orifice 1.

[0030] The first pressure reducing orifice 1 has a through hole 11 passing through the two end faces of the first pressure reducing orifice 1, and a plurality of first water passing grooves 12 are arranged on the inner end face of the first pressure reducing orifice 1, the first water passing grooves 12 are in communication with the through hole 11 and the outer circumferential surface of the first pressure reducing orifice 1.

[0031] The second pressure reducing orifice 2 is provided with a concave cavity 21 at the center of the outer end face, and a plurality of second water passing grooves 22 are arranged on the outer end face of the second pressure reducing orifice 2, the second water passing grooves 22 are in communication with the concave cavity 21 and the outer circumferential surface of the second pressure reducing orifice 2.

[0032] The first pressure reducing orifice and the second pressure reducing orifice are arranged in an overlapping manner, one end face of the first pressure reducing orifice relative to the second pressure reducing orifice is an inner end face, and the other end face of the first pressure reducing orifice opposite to the second pressure reducing orifice is an outer end face; similarly, one end face of the second pressure reducing orifice relative to the first pressure reducing orifice is an inner end face, and the other end face of the second pressure reducing orifice opposite to the first pressure reducing orifice is an outer end face.

[0033] In this way, the first pressure reducing orifice and the second pressure reducing orifice form a pressure reducing orifice, the diameter of the first pressure reducing orifice is larger than that of the second pressure reducing orifice, thereby forming an annular groove on the outer circumferential surface of the second pressure reducing orifice; in use, water flows through the through hole of the first pressure reducing orifice, then flows from the inner to the outer along the first water passing grooves, and then flows into the outer annular groove, thereby forming a first pressure reduction; the water in the outer annular groove flows from the outer to the inner along the second water passing grooves on the second pressure reducing orifice, and then flows into the concave cavity, thereby forming a second pressure reduction; in this way, the resistance loss along the way can be effectively increased, the pressure drop of the pressure reducing orifice can be increased, thereby increasing the throttling effect, and the length of the throttling pipe body can be effectively shortened, the processing difficulty can be reduced, and the processing cost can be reduced.

[0034] In specific implementation, the outer circumferential surface of the first pressure reducing orifice 1 is provided with an annular groove 14 for arranging an O-shaped sealing ring.

[0035] In specific implementation, all the first water passing grooves 12 on the inner end face of the first pressure reducing orifice 1 are uniformly distributed, and the first water passing grooves 12 are arc grooves, thereby forming a spiral structure on the inner end face of the first pressure reducing orifice 1.

[0036] The first water channel is arranged as an arc-shaped channel, which is beneficial to prolong the length of the first water channel, thereby further increasing the flow resistance loss of the water flow through the first pressure reducing orifice plate and increasing the pressure drop of the pressure reducing orifice plate.

[0037] In a specific implementation, all the second water channels 22 on the outer end surface of the second pressure reducing orifice plate 2 are uniformly distributed, and the second water channels 22 are arranged as arc-shaped channels to form a spiral structure on the outer end surface of the second pressure reducing orifice plate.

[0038] The second water channel is arranged as an arc-shaped channel, which is beneficial to prolong the length of the second water channel, thereby further increasing the flow resistance loss of the water flow through the second pressure reducing orifice plate and increasing the pressure drop of the pressure reducing orifice plate.

[0039] In a specific implementation, the first water channels 12 on the first pressure reducing orifice plate 1 and the second water channels 22 on the second pressure reducing orifice plate 2 are arranged in a staggered manner.

[0040] In this way, after the water flow flows out of the first water channel of the first pressure reducing orifice plate, the water flow does not immediately enter the second water channel of the second pressure reducing orifice plate, thereby further increasing the flow resistance loss of the pressure reducing orifice plate and improving the throttling effect.

[0041] In a specific implementation, the second pressure reducing orifice plate 2 is fixedly arranged on one end surface of the first pressure reducing orifice plate 1 through a positioning pin; the inner end surface of the first pressure reducing orifice plate 1 is provided with two first positioning holes 13, the inner end surface of the second pressure reducing orifice plate 2 is provided with two second positioning holes, the second positioning holes are arranged in a one-to-one corresponding manner with the first positioning holes 13, and a positioning pin is arranged in the first positioning hole 13 and the second positioning hole, thereby enabling the second pressure reducing orifice plate 2 to be fixedly arranged on one end surface of the first pressure reducing orifice plate 1.

[0042] Referring to Figures 2-5 A pressure reducing throttling device, comprising the pressure reducing orifice plate 03 described above.

[0043] In a specific implementation, the throttling pipe body 02 is provided with an inlet flange 01 at the inlet end, a plurality of pressure reducing orifice plates 03 are arranged in the throttling pipe body 02, all the pressure reducing orifice plates 03 are arranged in a longitudinal and side-by-side manner along the throttling pipe body 02, the central axis of the pressure reducing orifice plate 03 is located on the same straight line as the central axis of the throttling pipe body 02, an O-shaped sealing ring 09 is arranged in the annular groove 14 of the first pressure reducing orifice plate 1, and an outlet flange 011 is arranged at the outlet end of the throttling pipe body 02.

[0044] In this way, a plurality of sets of pressure reducing orifice plates are arranged in the throttle pipe body to throttle, the water flow flows from inside to outside through the first pressure reducing orifice plate, flows into the external annular groove, and forms a first pressure reduction; the water in the external annular groove flows from outside to inside through the second pressure reducing orifice plate to the concave cavity, and forms a first pressure reduction, and then the water flow flows through the next set of pressure reducing orifice plates. The external annular groove is sealed by the O-shaped sealing ring installed on the first pressure reducing orifice plate, and the water flow can only flow along the set flow channel of the pressure reducing orifice plate for throttling, and the two planes of the first pressure reducing orifice plate and the second pressure reducing orifice plate form a plane seal under the action of the bolt pressing force corresponding to the inlet flange and the outlet flange.

[0045] In specific implementation, the pressing flange 010 is arranged between the outlet end of the throttle pipe body 02 and the outlet flange 011.

[0046] Here, the pressing flange can make the fluid spread on the pressing flange, and the cavitation diffusion area is located inside the pressing flange, avoiding the cavitation diffusion area on the external connecting pipe, thereby avoiding the rupture of the external connecting pipe; at the same time, the pressing flange here serves as a consumable part and can be regularly overhauled and replaced, thereby not affecting use. At the same time, in order to ensure the cavitation resistance of the pressing flange, the pressing flange can be thickened here.

[0047] In specific implementation, the pressing flange and the pressure reducing orifice plate are made of 4 series stainless steel, and the 4 series stainless steel is subjected to special heat treatment, which can effectively increase the erosion resistance and cavitation resistance, thereby effectively ensuring the service life of the throttling device.

[0048] Finally, it should be noted that the above embodiments of the present application are only examples for illustrating the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes and variations can also be made. Here, all the embodiments cannot be exhausted. Any obvious changes or variations derived from the technical solutions of the present application still fall within the protection scope of the present application.

Claims

1. A reduced pressure vent plate, comprising: The first pressure reducing orifice plate and the second pressure reducing orifice plate are circular, are arranged in an overlapping manner, and have their central axes on the same line; the second pressure reducing orifice plate has a smaller diameter than the first pressure reducing orifice plate; The first pressure reducing orifice plate has a through hole in its center, and a plurality of first water passing grooves are arranged on the inner end surface of the first pressure reducing orifice plate, and the through hole and the outer circumferential surface of the first pressure reducing orifice plate are communicated through the first water passing grooves; The second pressure reducing orifice plate has a concave cavity in its center, and a plurality of second water passing grooves are arranged on the outer end surface of the second pressure reducing orifice plate, and the concave cavity and the outer circumferential surface of the second pressure reducing orifice plate are communicated through the second water passing grooves; An annular groove is arranged on the outer circumferential surface of the first pressure reducing orifice plate for arranging an O-shaped sealing ring; the first water passing grooves are evenly distributed on the inner end surface of the first pressure reducing orifice plate, and are arc-shaped grooves to form a spiral structure on the inner end surface of the first pressure reducing orifice plate; the second water passing grooves are evenly distributed on the outer end surface of the second pressure reducing orifice plate, and are arc-shaped grooves to form a spiral structure on the outer end surface of the second pressure reducing orifice plate.

2. A pressure reducing orifice plate according to claim 1, wherein The first water passing grooves on the first pressure reducing orifice plate and the second water passing grooves on the second pressure reducing orifice plate are arranged in a staggered manner.

3. A pressure reducing orifice plate according to claim 2, wherein The second pressure reducing orifice plate is arranged on one end surface of the first pressure reducing orifice plate in a relatively fixed manner through a positioning pin; two first positioning holes are arranged on the inner end surface of the first pressure reducing orifice plate, two second positioning holes are arranged on the inner end surface of the second pressure reducing orifice plate, the second positioning holes are arranged in a one-to-one corresponding manner with the first positioning holes, and a positioning pin is arranged in each of the first positioning holes and the second positioning holes, so that the second pressure reducing orifice plate is arranged on one end surface of the first pressure reducing orifice plate in a relatively fixed manner.

4. A pressure reducing orifice device characterized by, The pressure reducing orifice plate comprises any one of the pressure reducing orifice plates in claims 1-3.

5. A pressure reducing device according to claim 4, wherein The throttle pipe body has an inlet flange arranged on the inlet end, a plurality of pressure reducing orifice plates arranged in the throttle pipe body, all the pressure reducing orifice plates arranged in a side-by-side manner along the longitudinal direction of the throttle pipe body, the central axes of the pressure reducing orifice plates and the central axis of the throttle pipe body arranged on the same line, an O-shaped sealing ring arranged in the annular groove of the first pressure reducing orifice plate, and an outlet flange arranged on the outlet end of the throttle pipe body.

6. A pressure reducing device according to claim 5, wherein A pressing flange is arranged between the outlet end of the throttle pipe body and the outlet flange.

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