A high-pressure multi-stage pressure reducing valve

Abstract

The present invention relates to the field of valves and discloses a high-pressure multi-stage pressure reducing valve, which includes a housing, a valve core, a diaphragm, and a pressure regulating assembly. The housing is provided with an inlet pipe, a primary throttle port, a transition chamber, an outlet pipe, a piston channel, a pressure stabilizing chamber, an installation chamber, and a pressure stabilizing branch. The inlet pipe, the primary throttle port, the transition chamber, and the outlet pipe are sequentially connected. The piston channel is provided between the outlet pipe and the pressure stabilizing chamber. The pressure stabilizing branch is connected between the outlet pipe and the pressure stabilizing chamber. The diaphragm is sealed and installed between the pressure stabilizing chamber and the installation chamber. The pressure regulating assembly is installed in the installation chamber and abuts against the diaphragm. The pressure reducing valve also includes a secondary throttle cylinder, which is installed in the transition chamber and separates the primary throttle port from the transition chamber. The present invention can realize multi-stage throttling pressure reduction of a medium in the same pressure reducing valve, reduce the risk of cavitation of the medium under high-pressure drop conditions, reduce the operating cost of the system, and improve the stability of the system operation.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a high-pressure multi-stage pressure reducing valve. Background Art

[0002] A pressure reducing valve is a valve that reduces inlet pressure to a desired outlet pressure through regulation, automatically maintaining a stable outlet pressure by relying on the energy of the medium itself. From a fluid mechanics perspective, a pressure reducing valve is a throttling element with variable local resistance. This means that by varying the throttling area, the flow rate and kinetic energy of the fluid are altered, resulting in varying pressure losses, thereby achieving the purpose of reducing pressure. The control and regulation system then balances pressure fluctuations downstream of the valve with the spring force, maintaining a constant pressure within a certain tolerance.

[0003] Commonly used pressure reducing valves are typically single-stage throttling valves with conical or flat discs. While these valves work well at low pressure drops, they are prone to cavitation at high pressure drops, leading to premature failure of the throttling element. Therefore, for high pressure drops, two or more pressure reducing valves are often used in series to achieve the desired outlet pressure drop and maintain stable operation. However, using pressure reducing valves in series increases system operating costs, the frequency of product failures, and instability. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-pressure multi-stage pressure reducing valve, which solves the problem pointed out in the background technology that using two or more pressure reducing valves in series will increase the operating cost of the system and increase the frequency and instability of product failures.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] A high-pressure multi-stage pressure reducing valve, the pressure reducing valve comprises a housing, a valve core, a diaphragm and a pressure regulating assembly, the housing is provided with an inlet pipe, a primary throttle port, a transition chamber, an outlet pipe, a piston channel, a pressure stabilizing chamber, an installation chamber and a pressure stabilizing branch, the inlet pipe, the primary throttle port, the transition chamber and the outlet pipe are connected in sequence, the piston channel is arranged between the outlet pipe and the pressure stabilizing chamber, the pressure stabilizing branch is connected between the outlet pipe and the pressure stabilizing chamber, the diaphragm is sealed and installed between the pressure stabilizing chamber and the installation chamber, the pressure regulating assembly is installed in the installation chamber and abuts against the diaphragm, the pressure reducing valve further comprises a secondary throttle cylinder, the secondary throttle cylinder is installed in the transition chamber and separates the primary throttle port and the transition chamber, One end of the secondary throttling cylinder is an open end, and the open end of the secondary throttling cylinder is connected to the primary throttling port. The other end of the secondary throttling cylinder is provided with a plurality of secondary throttling holes, and the secondary throttling holes are connected to the transition chamber; the valve core includes a valve stem, and a sealing piston, a primary valve disc and a secondary valve disc are installed on the valve stem. The valve stem extends from the transition chamber to the pressure stabilizing chamber, the upper end of the valve stem rests on the diaphragm, and a return spring is provided between the lower end of the valve stem and the bottom of the shell. The sealing piston is slidably installed in the piston channel, the primary valve disc rests on the lower side of the primary throttling port and seals the primary throttling port, and the secondary valve disc rests on the lower side of the secondary throttling cylinder and seals the secondary throttling hole.

[0007] Furthermore, the secondary valve disc is provided with a plurality of protrusions adapted to the secondary throttling hole. When the secondary valve disc abuts against the lower side of the secondary throttling cylinder, the protrusions are inserted into the secondary throttling hole.

[0008] Furthermore, an upper abutment is mounted on the upper end of the valve stem, the upper abutment rests on the diaphragm, and a lower abutment is mounted on the lower end of the valve stem, the lower abutment rests on one end of the return spring.

[0009] Furthermore, the secondary valve disc is installed on the valve stem in an axially sliding manner, and a secondary pressure reducing spring is installed between the secondary valve disc and the lower abutment. The upper end of the secondary pressure reducing spring is fixed on the secondary valve disc, and the lower end of the secondary pressure reducing spring is fixed on the lower abutment.

[0010] Furthermore, the pressure reducing valve also includes a diverter plate, which is installed in the pressure stabilizing chamber. The diverter plate and the inner wall of the pressure stabilizing chamber enclose a diverter chamber. A number of evenly distributed diverter holes are opened on the diverter plate. The diverter holes connect the diverter chamber and the pressure stabilizing chamber. The end of the pressure stabilizing branch away from the outlet pipe is connected to the diverter chamber.

[0011] Furthermore, the pressure regulating assembly includes an upper cover body, a lower cover body, a pressure regulating spring and a threaded sleeve. The upper cover body and the lower cover body are both slidably installed in the installation cavity along the vertical direction. The pressure regulating spring is installed between the upper cover body and the lower cover body. The threaded sleeve is threadedly connected to the upper end of the shell. The threaded sleeve has a push rod, the lower end of the push rod rests on the upper cover body, and the lower side of the lower cover body rests on the diaphragm.

[0012] Furthermore, limiting sliders are fixed on both sides of the upper cover body, and vertical limiting grooves adapted to the limiting sliders are provided on both sides of the installation cavity, and the limiting sliders are slidably installed in the vertical limiting grooves.

[0013] Furthermore, the shell is provided with an annular connecting plate in the transition chamber, and the open end of the secondary throttling cylinder is threadedly connected to the annular connecting plate.

[0014] Furthermore, the housing includes an end cover, a first valve housing and a second valve housing, the end cover is sealed and connected to the lower end of the first valve housing through a flange, and the second valve housing is sealed and connected to the upper end of the first valve housing through a flange.

[0015] Beneficial effects of the present invention:

[0016] When the pressure reducing valve in the present application is working, the pressure on the valve core is first adjusted by the pressure regulating component, thereby adjusting the opening range of the valve core to the first-level throttling port and the second-level throttling hole, and then the medium passes through the first-level throttling port and all the second-level throttling holes in turn, and finally enters the outlet pipe from the transition chamber, thereby realizing multi-stage throttling and pressure reduction of the medium in the same pressure reducing valve, reducing the risk of cavitation of the medium under high-pressure drop conditions, and can reduce the operating cost of the system and improve the stability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a pressure reducing valve in an embodiment of the present application;

[0018] Figure 2 This is an embodiment of the present application Figure 1 A magnified schematic diagram of point A in the middle;

[0019] Figure 3 is a cross-sectional view of the valve core in an embodiment of the present application;

[0020] Figure 4 This is a schematic structural diagram of the diverter plate in an embodiment of the present application;

[0021] Among them, 100, housing; 101, end cover; 102, first valve housing; 103, second valve housing; 104, inlet pipe; 105, primary throttle; 106, transition chamber; 107, outlet pipe; 108, piston channel; 109, pressure stabilizing chamber; 110, installation chamber; 111, pressure stabilizing branch; 112, annular connecting plate; 113, vertical limit groove; 200, valve core; 210, valve stem; 220, sealing piston; 230, primary valve disc; 24 0. Secondary valve disc; 241. Protrusion; 250. Upper abutment; 260. Lower abutment; 270. Return spring; 280. Secondary pressure-reducing spring; 300. Diaphragm; 400. Secondary throttling cylinder; 410. Secondary throttling hole; 500. Pressure regulating assembly; 510. Upper cover; 511. Limiting slider; 520. Lower cover; 530. Pressure regulating spring; 540. Threaded sleeve; 541. Abutment rod; 600. Diverter plate; 610. Diverter chamber; 620. Diverter hole. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-Figure 4 As shown, an embodiment of the present application provides a high-pressure multi-stage pressure reducing valve, which includes a housing 100, a valve core 200, a diaphragm 300, a secondary throttling cylinder 400, and a pressure regulating assembly 500. The housing 100 includes an end cover 101, a first valve housing 102, and a second valve housing 103. The end cover 101 is sealed to the lower end of the first valve housing 102 via a flange, and the second valve housing 103 is sealed to the upper end of the first valve housing 102 via a flange. The three-part split structure of the end cover 101, the first valve housing 102, and the second valve housing 103 together constitute the housing 100 of the pressure reducing valve.

[0024] The housing 100 is provided with an inlet pipe 104, a primary throttle 105, a transition chamber 106, an outlet pipe 107, a piston channel 108, a pressure-stabilizing chamber 109, an installation chamber 110, and a pressure-stabilizing branch 111. The inlet pipe 104, the primary throttle 105, the transition chamber 106, the outlet pipe 107, the piston channel 108, and the pressure-stabilizing chamber 109 are all disposed on the first valve housing 102. The inlet pipe 104, the primary throttle 105, the transition chamber 106, and the outlet pipe 107 are sequentially connected. In the prior art, when the pressure reducing valve is operating, the fluid passes through the inlet pipe 104, the primary throttle 105, the transition chamber 106, and the outlet pipe 107 in sequence, achieving throttling and pressure reduction. The piston channel 108 is disposed between the outlet pipe 107 and the pressure-stabilizing chamber 109 and is used to mount part of the valve core 200. The pressure-stabilizing branch 111 connects the outlet pipe 107 and the pressure-stabilizing chamber 109, directing the throttled and decompressed fluid into the pressure-stabilizing chamber 109. The pressure-stabilizing branch 111 can be designed as an external pipe. The diaphragm 300 is sealed between the pressure-stabilizing chamber 109 and the mounting chamber 110, separating them. Specifically, the edge of the diaphragm 300 is compressed between the first valve housing 102 and the second valve housing 103, thereby sealing the pressure-stabilizing chamber 109. The pressure-regulating assembly 500 is installed within the mounting chamber 110 and rests against the diaphragm 300 to regulate the fluid pressure.

[0025] In this embodiment, a secondary throttling barrel 400 is installed in the transition chamber 106. The secondary throttling barrel 400 separates the primary throttling port 105 from the transition chamber 106. One end of the secondary throttling barrel 400 is open, and the open end of the secondary throttling barrel 400 is connected to the primary throttling port 105. The other end of the secondary throttling barrel 400 is provided with a plurality of secondary throttling holes 410. The aperture of the secondary throttling holes 410 is smaller than that of the primary throttling port 105, and the secondary throttling holes 410 are connected to the transition chamber 106. In this embodiment, after passing through the primary throttling port 105, the fluid will pass through multiple secondary throttling holes 410 again, thereby achieving multi-stage throttling.

[0026] In this embodiment, the valve core 200 includes a valve stem 210, on which are mounted a sealing piston 220, a primary valve disc 230, a secondary valve disc 240, an upper abutment 250, and a lower abutment 260. The valve stem 210 extends from the transition chamber 106 into the pressure-stabilizing chamber 109, passing through the piston passage 108, the outlet pipe 107, the primary throttle port 105, and the secondary throttle cylinder 400. The upper abutment 250 is fixed to the upper end of the valve stem 210 and abuts against the diaphragm 300. The lower abutment 260 is fixed to the lower end of the valve stem 210. A return spring 270 is disposed between the lower end of the valve stem 210 and the bottom of the housing 100. Specifically, the upper end of the return spring 270 is mounted on the lower abutment 260, and the lower end of the return spring 270 is mounted on the end cap 101. The sealing piston 220 is slidably mounted within the piston passage 108, separating the outlet pipe 107 from the pressure-stabilizing chamber 109 and also sealing the pressure-stabilizing chamber 109. The primary valve flap 230 abuts against the underside of the primary throttle opening 105 and seals the primary throttle opening 105. The secondary valve flap 240 abuts against the underside of the secondary throttle cylinder 400 and seals the secondary throttle hole 410.

[0027] Through the above-mentioned technical solution, when the pressure reducing valve of this embodiment is in operation, the pressure regulating assembly 500 first adjusts the pressure on the valve core 200, thereby adjusting the opening range of the valve core 200 to the first-level throttle port 105 and the second-level throttle hole 410. Then, the medium passes through the first-level throttle port 105 and all the second-level throttle holes 410 in sequence, and finally enters the outlet pipe 107 from the transition chamber 106. In this way, multi-stage throttling and pressure reduction of the medium are achieved in the same pressure reducing valve, reducing the risk of cavitation of the medium under high-pressure drop conditions. In addition, the medium in the outlet pipe 107 will enter the pressure stabilizing chamber 109 through the pressure stabilizing branch 111 and generate an upward force on the diaphragm 300. This force, together with the force applied to the diaphragm 300 by the pressure regulating assembly 500, maintains the stability of the valve core 200, thereby keeping the outlet pressure of the outlet pipe 107 stable.

[0028] In this embodiment, since the aperture of the secondary throttling hole 410 is relatively small and is easily blocked by some piles of small-particle impurities, the secondary valve flap 240 in this embodiment is provided with a number of protrusions 241 that adapt to the secondary throttling hole 410. When the secondary valve flap 240 abuts against the lower side of the secondary throttling cylinder 400, the protrusion 241 can be inserted into the secondary throttling hole 410 adapted thereto, thereby poking out the impurities in the secondary throttling hole 410, thereby keeping the secondary throttling hole 410 unobstructed.

[0029] In this embodiment, the secondary valve flap 240 is mounted on the valve stem 210 for sliding movement along the axial direction of the valve stem 210. A secondary pressure-reducing spring 280 is installed between the secondary valve flap 240 and the lower abutment 260. The upper end of the secondary pressure-reducing spring 280 is fixed to the secondary valve flap 240, and the lower end of the secondary pressure-reducing spring 280 is fixed to the lower abutment 260. When the pressure regulating assembly 500 adjusts the valve core 200 to a small extent, so that the protrusion 241 fails to completely disengage from the secondary throttle orifice 410, the fluid can use its own energy to impact the secondary valve flap 240, causing the secondary valve flap 240 to squeeze the secondary pressure-reducing spring 280 downward, thereby fully opening the secondary throttle orifice 410 and actively reducing the pressure of the fluid as it passes through the secondary throttle orifice 410. This design reduces the adjustment range of the valve core 200 by the pressure regulating assembly 500, thereby reducing the degree of deformation of the diaphragm 300 and extending the service life of the diaphragm 300.

[0030] In this embodiment, the pressure reducing valve further includes an annular diverter plate 600, which is installed in the pressure stabilizing chamber 109. The diverter plate 600 and the inner sidewall of the pressure stabilizing chamber 109 form a sealed diverter chamber 610. The diverter plate 600 is provided with a plurality of evenly distributed diverter holes 620, which connect the diverter chamber 610 with the pressure stabilizing chamber 109. The end of the pressure stabilizing branch 111 away from the outlet pipe 107 is connected to the diverter chamber 610. This arrangement allows the fluid to pass through the evenly distributed diverter holes 620 before entering the pressure stabilizing chamber 109 from the pressure stabilizing branch 111, allowing the fluid to enter the pressure stabilizing chamber 109 evenly, thereby reducing the impact of the fluid on the diaphragm 300 and extending the service life of the diaphragm 300.

[0031] In this embodiment, the pressure regulating assembly 500 includes an upper housing 510, a lower housing 520, a pressure regulating spring 530, and a threaded sleeve 540. Both the upper housing 510 and the lower housing 520 are vertically slidably mounted within the mounting cavity 110, with the pressure regulating spring 530 mounted between the upper housing 510 and the lower housing 520. The threaded sleeve 540 is threadedly connected to the upper end of the housing 100. Specifically, the threaded sleeve 540 is threadedly connected to the upper end of the second valve housing 103. The threaded sleeve 540 includes a lever 541, the lower end of which abuts against the upper housing 510, while the lower side of the lower housing 520 abuts against the diaphragm 300. To adjust the opening range of the valve core 200, the threaded sleeve 540 can be rotated to vertically move the lever 541, thereby adjusting the elastic force exerted on the diaphragm 300 by the pressure regulating spring 530 via the upper housing 510, thereby adjusting the opening range of the valve core 200.

[0032] In this embodiment, limit sliders 511 are fixed on both sides of the upper cover 510. Vertical limit slots 113 adapted to the limit sliders 511 are provided on both sides of the mounting cavity 110. The limit sliders 511 are slidably mounted in the vertical limit slots 113. The cooperation between the limit sliders 511 and the vertical limit slots 113 allows the upper cover 510 to move only in the vertical direction.

[0033] In this embodiment, in order to facilitate the installation of the secondary throttling cylinder 400, the shell 100 is provided with an annular connecting plate 112 in the transition chamber 106, and the open end of the secondary throttling cylinder 400 is threadedly connected to the annular connecting plate 112. The installation of the secondary throttling cylinder 400 is achieved by threaded connection, which is convenient for installation and disassembly.

[0034] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalents shall be encompassed by the claims of the present invention. Any techniques, shapes, and structures not described in detail herein are well known.

Claims

1. A high-pressure multi-stage pressure reducing valve, comprising a housing (100), a valve core (200), a diaphragm (300) and a pressure regulating assembly (500), wherein the housing (100) is provided with an inlet pipe (104), a primary throttle (105), a transition chamber (106), an outlet pipe (107), a piston channel (108), a pressure stabilizing chamber (109), an installation chamber (110) and a pressure stabilizing branch (111), wherein the inlet pipe (104), the primary throttle (105), the transition chamber (106), the outlet pipe (107), the piston channel (108), the pressure stabilizing chamber (109), the installation chamber (110) and the pressure stabilizing branch (111). The pressure regulating chamber (106) and the outlet pipe (107) are connected in sequence, the piston channel (108) is arranged between the outlet pipe (107) and the pressure stabilizing chamber (109), the pressure stabilizing branch (111) is connected between the outlet pipe (107) and the pressure stabilizing chamber (109), the diaphragm (300) is sealed and installed between the pressure stabilizing chamber (109) and the installation chamber (110), and the pressure regulating assembly (500) is installed in the installation chamber (110) and abuts against the diaphragm (300), characterized in that: The pressure reducing valve further comprises a secondary throttling cylinder (400), which is installed in the transition chamber (106) and separates the primary throttling port (105) from the transition chamber (106). One end of the secondary throttling cylinder (400) is an open end, and the open end of the secondary throttling cylinder (400) is connected to the primary throttling port (105). The other end of the secondary throttling cylinder (400) is provided with a plurality of secondary throttling holes (410), and the secondary throttling holes (410) are connected to the transition chamber (106). The valve core (200) comprises a valve stem (210), and a sealing piston (220), a primary valve disc and a valve stem (210) are installed on the valve stem (210). (230) and a secondary valve flap (240), the valve stem (210) extends from the transition chamber (106) to the pressure stabilizing chamber (109), the upper end of the valve stem (210) abuts against the diaphragm (300), a return spring (270) is provided between the lower end of the valve stem (210) and the bottom of the housing (100), the sealing piston (220) is slidably installed in the piston channel (108), the primary valve flap (230) abuts against the lower side of the primary throttle port (105) and seals the primary throttle port (105), and the secondary valve flap (240) abuts against the lower side of the secondary throttle cylinder (400) and seals the secondary throttle hole (410).

2. The pressure reducing valve according to claim 1, characterized in that The secondary valve flap (240) is provided with a plurality of protrusions (241) adapted to the secondary throttling hole (410). When the secondary valve flap (240) abuts against the lower side of the secondary throttling cylinder (400), the protrusions (241) are inserted into the secondary throttling hole (410).

3. The pressure reducing valve according to claim 2, characterized in that An upper abutment (250) is installed at the upper end of the valve stem (210), and the upper abutment (250) abuts against the diaphragm (300). A lower abutment (260) is installed at the lower end of the valve stem (210), and the lower abutment (260) abuts against one end of the return spring (270).

4. The pressure reducing valve according to claim 3, characterized in that The secondary valve flap (240) is slidably mounted on the valve stem (210) along the axial direction of the valve stem (210), and a secondary pressure-reducing spring (280) is mounted between the secondary valve flap (240) and the lower abutment (260). The upper end of the secondary pressure-reducing spring (280) is fixed on the secondary valve flap (240), and the lower end of the secondary pressure-reducing spring (280) is fixed on the lower abutment (260).

5. The pressure reducing valve according to claim 1, characterized in that The pressure reducing valve further comprises an annular diverter plate (600), the diverter plate (600) being installed in the pressure stabilizing chamber (109), the diverter plate (600) and the inner side wall of the pressure stabilizing chamber (109) enclosing a diverter chamber (610), the diverter plate (600) being provided with a plurality of evenly distributed diverter holes (620), the diverter holes (620) connecting the diverter chamber (610) and the pressure stabilizing chamber (109), and the end of the pressure stabilizing branch (111) away from the outlet pipe (107) being connected to the diverter chamber (610).

6. The pressure reducing valve according to claim 1, characterized in that The pressure regulating assembly (500) includes an upper cover (510), a lower cover (520), a pressure regulating spring (530) and a threaded sleeve (540). The upper cover (510) and the lower cover (520) are both slidably installed in the installation cavity (110) along the vertical direction. The pressure regulating spring (530) is installed between the upper cover (510) and the lower cover (520). The threaded sleeve (540) is threadedly connected to the upper end of the housing (100). The threaded sleeve (540) has a push rod (541). The lower end of the push rod (541) is against the upper cover (510), and the lower side of the lower cover (520) is against the diaphragm (300).

7. The pressure reducing valve according to claim 6, characterized in that Limiting sliders (511) are fixed on both sides of the upper cover (510), and vertical limiting grooves (113) adapted to the limiting sliders (511) are provided on both sides of the installation cavity (110), and the limiting sliders (511) are slidably installed in the vertical limiting grooves (113).

8. The pressure reducing valve according to claim 1, wherein: The housing (100) is provided with an annular connecting plate (112) in the transition chamber (106), and the open end of the secondary throttling cylinder (400) is threadedly connected to the annular connecting plate (112).

9. The pressure reducing valve according to claim 1, wherein: The housing (100) comprises an end cover (101), a first valve housing (102) and a second valve housing (103), wherein the end cover (101) is sealed to the lower end of the first valve housing (102) via a flange, and the second valve housing (103) is sealed to the upper end of the first valve housing (102) via a flange.

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