CN111520495A

CN111520495A - High-pressure low-noise multi-stage pressure-reducing regulating valve

Info

Publication number: CN111520495A
Application number: CN202010452738.7A
Authority: CN
Inventors: 余洪斌; 王汉克; 周瑜钦; 李家慧; 谢锦礼; 陈阿云
Original assignee: Zhejiang Pariworld Automation Meter Co ltd
Current assignee: Zhejiang Pariworld Automation Meter Co ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-08-11
Anticipated expiration: 2040-05-26
Also published as: CN111520495B

Abstract

The invention discloses a high-pressure low-noise multistage pressure reduction regulating valve which comprises a valve body, a valve cover, a valve rod, a valve seat, a valve core, a packing sealing assembly, a sleeve assembly and a throttling assembly, wherein a first flow passage and a second flow passage are arranged in the valve body; the valve cover is fixed at the upper end of the valve body, the valve rod penetrates through the valve cover and the valve body, the packing sealing assembly is arranged between the valve rod and the valve rod, the lower end of the valve rod is connected with the valve core, and the valve core is arranged in the overflowing cavity and forms sealing fit with the valve seat; the sleeve component is provided with a plurality of flow guide holes communicated with the first flow channel, and the throttling component is axially distributed with a plurality of groups of throttling channels communicated with the flow guide holes. The invention can realize multi-stage pressure reduction and reduce the noise generated by pressure when in use, thereby ensuring the safety of the whole system.

Description

High-pressure low-noise multi-stage pressure-reducing regulating valve

Technical Field

The invention relates to the technical field of regulating valves, in particular to a high-pressure low-noise multistage pressure reduction regulating valve.

Background

A pressure reducing regulating valve is a commonly used valve for regulating the pressure of a medium. When the medium flows to the valve core part, the flow rate can be rapidly increased due to the necking phenomenon generated by the throttling action of the valve core and the valve seat, the pressure is rapidly reduced and is often lower than the saturated vaporization pressure of the medium, in this case, the medium is vaporized to form bubbles, and the bubbles can be broken to generate extremely strong local pressure when the pressure exceeds the saturated vaporization pressure of the medium. The large energy of the bubble collapse can cause serious damage to the throttling elements such as the valve core, the valve seat and the like in a moment, and a so-called cavitation phenomenon is formed. Cavitation tends to generate high energy fluid noise and even damage to the valves, thereby affecting the safety of the overall system.

Disclosure of Invention

The invention aims to provide a high-pressure low-noise multistage pressure reduction regulating valve which can realize multistage pressure reduction and reduce noise generated by pressure during use, thereby ensuring the safety of the whole system.

In order to achieve the purpose, the invention provides the following technical scheme: the high-pressure low-noise multistage pressure reduction regulating valve comprises a valve body, a valve cover, a valve rod, a valve seat, a valve core, a packing sealing assembly, a sleeve assembly and a throttling assembly, wherein a first flow passage and a second flow passage are arranged in the valve body, a flow passing port is arranged between the first flow passage and the second flow passage, the valve seat, the throttling assembly and the sleeve assembly are sequentially arranged on the upper end surface of the flow passing port from bottom to top, and a flow passing cavity communicated with the first flow passage is formed inside the throttling assembly and the sleeve assembly; the valve cover is fixed at the upper end of the valve body, the valve rod penetrates through the valve cover and the valve body, the packing sealing assembly is arranged between the valve rod and the valve rod, the lower end of the valve rod is connected with the valve core, and the valve core is arranged in the overflowing cavity and forms sealing fit with the valve seat; the sleeve component is provided with a plurality of flow guide holes communicated with the first flow channel, the throttling component is axially distributed with a plurality of groups of throttling channels communicated with the flow guide holes, the first flow channel is communicated with the overflowing cavity sequentially through the flow guide holes and the throttling channels, and the medium pressure of the second flow channel is adjusted by controlling the axial position of the valve core to adjust the number of the throttling channels communicated with the overflowing cavity.

Preferably, the sleeve assembly comprises a sleeve main body and a flow guide sleeve, a first annular groove and a second annular groove are sequentially formed in the periphery of the sleeve main body from outside to inside, the height of the first annular groove is larger than that of the second annular groove, the upper end of the flow guide sleeve is embedded in the first annular groove, and the lower end of the flow guide sleeve and the lower end of the sleeve main body are both abutted against the throttling assembly; the flow guide hole is formed in the flow guide sleeve, and the second annular groove is located between the flow guide hole and the throttling channel.

Preferably, the sleeve main body is further provided with an overflowing window for communicating the second annular groove with the overflowing cavity.

Preferably, the throttling assembly comprises a first throttling element, a second throttling element and a third throttling element which are stacked from top to bottom, and the first throttling element, the second throttling element and the third throttling element are riveted together through round pins; the upper end surface of the first throttling element is provided with a first upper guide groove, the inner side of the first upper guide groove is provided with a first upper through groove connected with the flow cavity, the lower end surface of the first throttling element is provided with a first lower guide groove connected with the flow cavity, the inner side of the first lower guide groove is provided with a first lower through groove connected with the flow cavity, the upper end surface of the second throttling element is provided with a second upper guide groove superposed with the orthographic projection of the first upper guide groove, the inner side of the second upper guide groove is provided with a second upper through groove connected with the flow cavity, the lower end surface of the second throttling element is provided with a second lower guide groove superposed with the orthographic projection of the first lower guide groove, the inner side of the second lower guide groove is provided with a second lower through groove connected with the flow cavity, the upper end surface of the third throttling element is provided with a third upper guide groove superposed with the orthographic projection of the second upper guide groove, the inner side of the third upper guide groove is provided with a third upper through groove connected with the flow cavity, and the lower end surface of the third throttling element is provided with a, a third lower through groove connected with the flow cavity is formed in the inner side of the third lower guide groove; the first throttling element is provided with a first upper guide hole communicated with the second annular groove and the first lower guide groove and a first lower guide hole communicated with the first upper guide groove and the second upper guide groove, the second throttling element is provided with a second upper guide hole communicated with the first lower guide groove and the second lower guide groove and a second lower guide hole communicated with the second upper guide groove and the third upper guide groove, and the third throttling element is provided with a third lower guide hole communicated with the second lower guide groove and the third lower guide groove; the first upper guide groove and the first upper through groove, the first lower guide groove and the first lower through groove, the second upper guide groove and the second upper through groove, the second lower guide groove and the second lower through groove, the third upper guide groove and the third upper through groove, and the third lower guide groove and the third lower through groove form six groups of throttling channels.

Preferably, the cross-sectional areas of the first upper through groove, the first lower through groove, the second upper through groove, the second lower through groove, the third upper through groove and the third lower through groove are reduced in sequence.

Preferably, the number of the first upper guide hole, the first lower guide hole, the second upper guide hole and the second lower guide hole is reduced in sequence.

Preferably, the upper end surface of the first throttling element is provided with an upper mounting groove for embedding the bottom end of the flow guide sleeve, and the lower end surface of the third throttling element is provided with a lower mounting groove for embedding the top of the valve seat.

Preferably, a sealing cavity is formed in the side portion of the valve core, an O-shaped ring which forms a sealing fit between the outer wall of the valve core and the side wall of the overflowing cavity is embedded in the sealing cavity, the valve core is further connected with a pressing ring in a threaded manner, a convex ring is arranged at the bottom end of the pressing ring, and the O-shaped ring is pressed and fixed in the sealing cavity by the convex ring.

Preferably, the valve core is provided with a cavity, the bottom end of the valve core is provided with a clamping groove communicated with the cavity, a flow blocking disc is embedded in the clamping groove, the flow blocking disc is provided with a plurality of first through holes, and the upper part of the valve core is provided with a plurality of second through holes coaxial with the first through holes.

Preferably, the valve cover is provided with an upper groove body for installing the packing seal assembly, the packing seal assembly comprises a packing gland, a first packing layer, a packing core sleeve, a second packing layer and a packing baffle ring which are sequentially stacked from top to bottom, a packing press plate is pressed at the top of the packing gland, and the packing press plate is fixedly connected with the valve cover through a bolt.

The invention has the technical effects and advantages that:

1. the invention arranges a valve seat, a throttle component and a sleeve component on the overflow port between a first flow passage and a second flow passage, the throttle component and the sleeve component form an overflow cavity communicated with the first flow passage, a valve core slides axially along the inner wall of the overflow cavity under the drive of a valve rod, the sleeve component is provided with a plurality of flow guide holes communicated with the first flow passage, the throttle component is distributed with a plurality of groups of throttle channels communicated with the flow guide holes along the axial direction, the first flow passage is communicated with the overflow cavity through the flow guide holes and the throttle channels in sequence, the regulation of the medium pressure of the second flow passage is realized by controlling the axial position of the valve core to regulate the group number of the throttle channels communicated with the overflow cavity, when the valve core is positioned at the upper limit position, the overflow port is in an open state, and all the throttle channels are opened, and the valve core is driven by the valve rod to slowly descend, the number of the closed throttling channels is gradually increased, the throttling pressure reduction is gradually increased until the valve core moves to the lower limit position (namely, the valve core is abutted against the valve seat), the overflowing hole is closed, the outlets of all the throttling channels are blocked by the valve core, and the valve belongs to a closed state in the state. The valve core controls the opening and closing quantity of the throttling channels to realize the function of multi-stage regulation pressure reduction, and the medium collides in the plurality of flow guide holes and the throttling channels to consume kinetic energy, so that the throttling effect can be improved, the turbulent state of the medium in the flowing process in the valve body is improved, the generation of cavitation is avoided, the impact noise is greatly reduced, meanwhile, the damage of fluid impact on the valve is also reduced, and the safety of the whole system is ensured.

2. The sleeve component comprises a sleeve main body and a flow guide sleeve embedded on a first annular groove of the sleeve main body, wherein the flow guide hole is formed in the flow guide sleeve, and a second annular groove on the sleeve main body is positioned between the flow guide hole and the throttling channel.

3. The flow window on the sleeve main body can increase the maximum flow when the valve is fully opened, and when the valve core axially moves at the position of the flow window, the flow can also change along with the change of the overlapping area of the valve core and the flow window, and the flow can be changed more stably in a short time when the throttling adjustment starts and ends, so that the throttling adjustment accuracy is improved.

4. The throttling component is formed by stacking a first throttling element, a second throttling element and a third throttling element, wherein a first upper guide groove and a first upper through groove on the first throttling element, a first lower guide groove and a first lower through groove on the first throttling element, a second upper guide groove and a second upper through groove on the second throttling element, a second lower guide groove and a second lower through groove on the second throttling element, a third upper guide groove and a third upper through groove on the third throttling element, and a third lower guide groove and a third lower through groove on the third throttling element form six groups of throttling channels, so that a multi-stage throttling structure is formed, the multi-stage pressure reduction effect is achieved, the adjusting range is large, and multiple channels are beneficial to pressure reduction and noise reduction.

5. The cross sectional areas of the first upper through groove, the first lower through groove, the second upper through groove, the second lower through groove, the third upper through groove and the third lower through groove are sequentially reduced and are matched with the flow rates respectively entering the first upper guide groove, the first lower guide groove, the second upper guide groove, the second lower guide groove, the third upper guide groove and the third lower guide groove, so that the turbulent flow state can be improved, the medium flow is more stable, and the noise reduction effect is achieved.

6. The number of the first upper guide hole, the first lower guide hole, the second upper guide hole and the second lower guide hole is reduced in sequence, and the structure can ensure stable switching of multi-stage voltage reduction and further improve the effects of voltage reduction and noise reduction.

7. The bottom end of the flow guide sleeve is embedded into the upper mounting groove on the upper end surface of the first throttling element, and the top of the valve seat is embedded into the lower mounting groove on the lower end surface of the third throttling element, so that the throttling assembly is axially limited, the displacement of the throttling assembly is avoided, the structure is simple, the installation is convenient, and the stability of the whole structure is improved.

8. According to the invention, the O-shaped ring is arranged in the sealing cavity at the side part of the valve core and is in sealing fit with the inner wall of the overflowing cavity, so that the medium is prevented from leaking from the gap between the inner wall of the overflowing cavity and the outer wall of the valve core when the valve core is abutted against the valve seat, and the sealing effect after the valve is closed can be improved.

9. The cavity on the valve core, the second through hole and the first through hole on the flow blocking disc are communicated with the upper part and the lower part of the valve core, so that the pressure balance above and below the valve core is kept, the motion stability of the valve core is ensured, and the valve core has the advantage of reducing the operating moment of the valve rod.

10. The packing seal assembly can ensure the sealing performance between the valve cover and the valve rod, and has simple structure and convenient assembly and disassembly.

Drawings

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic structural view of the sleeve assembly of the present invention;

FIG. 3 is a top view of the throttling assembly of the present invention;

FIG. 4 is a longitudinal cross-sectional view of a throttle assembly of the present invention;

FIG. 5 is a cross-sectional view A-A of FIG. 3;

FIG. 6 is a schematic structural view of the valve cartridge of the present invention;

FIG. 7 is a schematic view of the installation configuration of the stuffing seal assembly according to the present invention.

In the figure: 1. a valve body; 101. a first flow passage; 102. a second flow passage; 103. a flow-through port; 104. a flow-through chamber; 2. a valve cover; 3. a valve stem; 4. a valve seat; 5. a valve core; 501. sealing the cavity; 502. an O-shaped ring; 503. pressing a ring; 504. a convex ring; 505. a cavity; 506. a card slot; 507. a flow blocking disc; 508. a first through hole; 509. a second through hole; 6. a packing seal assembly; 601. an upper trough body; 602. a packing gland; 603. a first filler layer; 604. a filler core sleeve; 605. a second packing layer; 606. a packing retainer ring; 607. a packing press plate; 7. a sleeve assembly; 701. a flow guide hole; 702. a sleeve body; 703. a flow guide sleeve; 704. a first annular groove; 705. a second annular groove; 706. an overcurrent window; 8. a throttle assembly; 801. a throttling channel; 802. a first orifice member; 8021. a first upper channel; 8022. a first upper through groove; 8023. a first lower guide groove; 8024. a first lower through groove; 8025. a first upper guide hole; 8026. a first lower guide hole; 8027. mounting a mounting groove; 803. a second orifice member; 8031. a second upper channel; 8032. a second upper through groove; 8033. a second lower guide groove; 8034. a second lower through groove; 8035. a second upper guide hole; 8036. a second lower guide hole; 804. a third throttling element; 8041. a third upper channel; 8042. a third upper through groove; 8043. a third lower guide groove; 8044. a third lower through groove; 8045. a third lower guide hole; 8046. and a lower mounting groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in the attached figures 1-7, the high-pressure low-noise multi-stage pressure reduction regulating valve comprises a valve body 1, a valve cover 2, a valve rod 3, a valve seat 4, a valve core 5, a packing sealing assembly 6, a sleeve assembly 7 and a throttling assembly 8, a first flow passage 101 and a second flow passage 102 are arranged in the valve body 1, a flow passing port 103 is arranged between the first flow passage 101 and the second flow passage 102, the valve seat 4, the throttling component 8 and the sleeve component 7 are sequentially arranged on the upper end surface of the overflowing opening 103 from bottom to top, a sealing gasket is clamped between the valve seat 4 and the overflowing opening 103, an overflowing cavity 104 communicated with the first flow channel 101 is formed inside the throttling component 8 and the sleeve component 7, the periphery of the upper end of the sleeve component 7 is clamped in a groove body formed in the upper end opening of the valve body 1, the sleeve component 7 is pressed and fixed by the valve cover 2 abutting against the upper end face of the sleeve component 7, and the sleeve component 7 presses and fixes the throttling component 8 on the valve seat 4; the valve cover 2 is fixed at the upper end of the valve body 1, the valve rod 3 penetrates through the valve cover 2 and the valve body 1, the packing sealing assembly 6 is arranged between the valve rod 3 and the valve rod 3, the lower end of the valve rod 3 is connected with the valve core 5, and the valve core 5 is arranged in the overflowing cavity 104 and forms sealing fit with the valve seat 4; the sleeve component 7 is provided with a plurality of flow guide holes 701 communicated with the first flow passage 101, the throttling component 8 is distributed with a plurality of groups of throttling passages 801 communicated with the flow guide holes 701 along the axial direction, the first flow passage 101 is communicated with the overflowing cavity 104 through the flow guide holes 701 and the throttling passages 801 sequentially, the number of the groups of the throttling passages 801 communicated with the overflowing cavity 104 is adjusted by controlling the axial position of the valve core 5 to realize the adjustment of the medium pressure of the second flow passage 102, when the valve core 5 is positioned at the upper limit position, the overflowing port 103 is in an open state, all the throttling passages 801 are opened, in the process of driving the valve core 5 to slowly descend through the valve rod 3, the number of the throttling passages 801 is gradually increased, the throttling pressure reduction is gradually enhanced, until the valve core 5 moves to the lower limit position (namely is abutted against the valve seat 4), the overflowing holes are closed, and the outlets of all the throttling passages 801 are blocked by, in which the valve is closed.

As shown in fig. 2, the sleeve assembly 7 includes a sleeve main body 702 and a flow guide sleeve 703, a first annular groove 704 and a second annular groove 705 are sequentially formed in the outer periphery of the sleeve main body 702 from outside to inside, the height of the first annular groove 704 is greater than that of the second annular groove 705, the upper end of the flow guide sleeve 703 is embedded in the first annular groove 704, and the lower end of the flow guide sleeve 703 and the lower end of the sleeve main body 702 both abut against the throttling assembly 8; the diversion holes 701 are formed in the diversion sleeve 703, the second annular groove 705 is located between the diversion holes 701 and the throttling channel 801, and the diversion holes 701 are evenly distributed along the circumferential direction. The design structure increases the medium flow stroke and the inflection point, not only can consume the kinetic energy of medium movement, but also can improve the throttling and pressure reducing effects, and is beneficial to reducing the fluid impact noise.

As shown in fig. 1 and fig. 2, the sleeve main body 702 is further provided with an overflow window 706 communicating the second annular groove 705 with the overflow chamber 104, specifically, four overflow windows 706 are circumferentially arranged, so that a medium uniformly passes through the four overflow windows 706, the overflow window 706 can increase the maximum flow rate when the valve is fully opened, and when the valve core 5 axially moves at the position of the overflow window 706, the flow rate can also change along with the change of the overlapping area of the valve core 5 and the overflow window 706, and the flow rate change can be more stable in a short time when the throttling adjustment starts and ends, thereby improving the accuracy of the throttling adjustment.

As shown in fig. 3 to 5, the throttling assembly 8 includes a first throttling element 802, a second throttling element 803 and a third throttling element 804 stacked from top to bottom, and the first throttling element 802, the second throttling element 803 and the third throttling element 804 are riveted together by round pins; the upper end surface of the first throttling element 802 is provided with a first upper guide groove 8021, the inner side of the first upper guide groove 8021 is provided with a first upper through groove 8022 connected with the flow cavity 104, the lower end surface of the first throttling element 802 is provided with a first lower guide groove 8023, the inner side of the first lower guide groove 8023 is provided with a first lower through groove 8024 connected with the flow cavity 104, the upper end surface of the second throttling element 803 is provided with a second upper guide groove 8031 superposed with the orthographic projection of the first upper guide groove 8021, the inner side of the second upper guide groove 8031 is provided with a second upper through groove 8032 connected with the flow cavity 104, the lower end surface of the second throttling element 803 is provided with a second lower guide groove 8033 superposed with the orthographic projection of the first lower guide groove 8023, the inner side of the second lower guide groove 8033 is provided with a second lower through groove 8034 connected with the flow cavity 104, the upper end surface of the third throttling element 804 is provided with a third upper guide groove 8041 superposed with the orthographic projection of the second upper guide groove 8031, and the inner side of the third upper guide groove 8041 connected with the upper through the flow cavity 104, a third lower guide groove 8043 which is superposed with the orthographic projection of the second lower guide groove 8033 is arranged on the lower end surface of the third throttling element 804, and a third lower through groove 8044 which is connected with the flow cavity 104 is arranged on the inner side of the third lower guide groove 8043; the first throttling element 802 is provided with a first upper guide hole 8025 communicating the second annular groove 705 with the first lower guide groove 8023 and a first lower guide hole 8026 communicating the first upper guide groove 8021 with the second upper guide groove 8031, the second throttling element 803 is provided with a second upper guide hole 8035 communicating the first lower guide groove 8023 with the second lower guide groove 8033 and a second lower guide hole 8036 communicating the second upper guide groove 8031 with the third upper guide groove 8041, and the third throttling element 804 is provided with a third lower guide hole 8045 communicating the second lower guide groove 8033 with the third lower guide groove 8043; the first upper guide groove 8021 and the first upper through groove 8022, the first lower guide groove 8023 and the first lower through groove 8024, the second upper guide groove 8031 and the second upper through groove 8032, the second lower guide groove 8033 and the second lower through groove 8034, the third upper guide groove 8041 and the third upper through groove 8042, the third lower guide groove 8043 and the third lower through groove 8044 form six groups of throttling channels 801, so that a multistage throttling structure is formed, a multistage pressure reduction effect is achieved, the adjusting range is large, and multiple channels are beneficial to pressure reduction and noise reduction.

The cross-sectional areas of the first upper through groove 8022, the first lower through groove 8024, the second upper through groove 8032, the second lower through groove 8034, the third upper through groove 8042 and the third lower through groove 8044 are sequentially reduced to match the flow rates entering the first upper guide groove 8021, the first lower guide groove 8023, the second upper guide groove 8031, the second lower guide groove 8033, the third upper guide groove 8041 and the third lower guide groove 8043 respectively, so that the turbulent flow state can be improved, the medium flow is more stable, and the noise reduction effect is achieved.

The number of the first upper guide hole 8025, the first lower guide hole 8026, the second upper guide hole 8035 and the second lower guide hole 8036 is reduced in sequence, and the structure can ensure stable switching of multistage voltage reduction and further improve the effect of reducing voltage and noise. The number of the first lower guide holes 8026 in each first upper guide groove 8021 is the same, the number of the first upper guide holes 8025 in each first lower guide groove 8023 is the same, the number of the second lower guide holes 8036 in each second upper guide groove 8031 is the same, the number of the second upper guide holes 8035 in each second lower guide groove 8033 is the same, and the number of the third upper guide holes in each third lower guide groove 8043 is the same.

As shown in fig. 4, the upper end surface of the first throttling element 802 is provided with an upper mounting groove 8027 for embedding the bottom end of the flow guiding sleeve 703, and the lower end surface of the third throttling element 804 is provided with a lower mounting groove 8046 for embedding the top of the valve seat 4, so that the throttling assembly 8 is axially limited, the displacement of the throttling assembly is avoided, and the throttling assembly is simple in structure and convenient to install, and the stability of the whole structure is improved.

As shown in fig. 1 and fig. 6, a sealing cavity 501 is formed in the side portion of the valve element 5, an O-shaped ring 502 which forms a sealing fit between the outer wall of the valve element 5 and the side wall of the overflow cavity 104 is embedded in the sealing cavity 501, the valve element 5 is further connected with a pressing ring 503 in a threaded manner, a protruding ring 504 is arranged at the bottom end of the pressing ring 503, the O-shaped ring 502 is pressed and fixed in the sealing cavity 501 by the protruding ring 504, the O-shaped ring 502 and the inner wall of the overflow cavity 104 form a sealing fit, leakage of a medium from a gap between the inner wall of the overflow cavity 104 and the outer wall of the valve element 5 when the valve element 5 is in contact with the valve seat.

As shown in fig. 1 and fig. 6, a cavity 505 is formed in the valve core 5, a clamping groove 506 communicated with the cavity 505 is formed at the bottom end of the valve core 5, a flow blocking disc 507 is embedded in the clamping groove 506, a plurality of first through holes 508 are formed in the flow blocking disc 507, a plurality of second through holes 509 coaxial with the first through holes 508 are formed in the upper portion of the valve core 5, and the upper portion and the lower portion of the valve core 5 are communicated through the cavity 505 and the second through holes 509 in the valve core 5 and the first through holes 508 in the flow blocking disc 507, so that pressure balance above and below the valve core 5 is maintained, the stability of the movement of the valve core 5 is ensured, and the advantage of reducing the operating torque of the valve rod 3.

As shown in fig. 7, an upper groove 601 for installing the packing seal assembly 6 is formed in the valve cover 2, the packing seal assembly 6 includes a packing gland 602, a first packing layer 603, a packing core sleeve 604, a second packing layer 605 and a packing baffle ring 606 which are sequentially stacked from top to bottom, a packing press plate 607 is pressed at the top of the packing gland 602 and is fixedly connected with the valve cover 2 through a bolt, and the design of the packing seal assembly 6 not only can ensure the sealing performance between the valve cover 2 and the valve rod 3, but also has a simple structure and is very convenient to assemble and disassemble.

The working principle is as follows: the invention sets a valve seat 4, a throttling component 8 and a sleeve component 7 on a flow passage port 103 between a first flow passage 101 and a second flow passage 102, a flow passage cavity 104 communicated with the first flow passage 101 is formed inside the throttling component 8 and the sleeve component 7, a valve core 5 slides axially along the inner wall of the flow passage cavity 104 under the drive of a valve rod 3, the sleeve component 7 is provided with a plurality of flow guide holes 701 communicated with the first flow passage 101, a plurality of groups of throttling channels 801 communicated with the flow guide holes 701 are distributed on the throttling component 8 axially, the first flow passage 101 is communicated with the flow passage cavity 104 through the flow guide holes 701 and the throttling channels 801 in sequence, the medium pressure of the second flow passage 102 is adjusted by adjusting the group number of the throttling channels 801 communicated with the flow passage cavity 104 by controlling the axial position of the valve core 5, when the valve core 5 is positioned at an upper limit position, the flow passage port 103 is in an open state, and all the throttling channels 801 are opened, in the process of driving the valve core 5 to slowly descend by the valve rod 3, the number of the closed throttling channels 801 is gradually increased, the throttling depressurization is gradually increased until the overflowing holes are closed when the valve core 5 moves to the lower limit position (namely, the overflowing holes are abutted against the valve seat 4), and the outlets of all the throttling channels 801 are blocked by the valve core 5, wherein the valve belongs to a closed state. The valve core 5 controls the opening and closing quantity of the throttling channel 801 to realize the function of multi-stage regulation pressure reduction, and the medium collides in the plurality of flow guide holes 701 and the throttling channel 801 to consume kinetic energy, so that the throttling effect can be improved, the turbulent state of the medium in the flowing process in the valve body 1 is improved, the generation of cavitation is avoided, the impact noise is greatly reduced, meanwhile, the damage of fluid impact on the valve is also reduced, and the safety of the whole system is ensured.

Claims

1. High pressure low noise multistage pressure reduction governing valve, its characterized in that: the valve comprises a valve body (1), a valve cover (2), a valve rod (3), a valve seat (4), a valve core (5), a packing sealing assembly (6), a sleeve assembly (7) and a throttling assembly (8), wherein a first flow passage (101) and a second flow passage (102) are arranged in the valve body (1), a flow passing port (103) is arranged between the first flow passage (101) and the second flow passage (102), the valve seat (4), the throttling assembly (8) and the sleeve assembly (7) are sequentially arranged on the upper end surface of the flow passing port (103) from bottom to top, and a flow passing cavity (104) communicated with the first flow passage (101) is formed inside the throttling assembly (8) and the sleeve assembly (7); the valve cover (2) is fixed at the upper end of the valve body (1), the valve rod (3) penetrates through the valve cover (2) and the valve body (1), the packing sealing assembly (6) is arranged between the valve rod (3) and the valve rod (3), the lower end of the valve rod (3) is connected with the valve core (5), and the valve core (5) is arranged in the overflowing cavity (104) and forms sealing fit with the valve seat (4); the sleeve component (7) is provided with a plurality of flow guide holes (701) communicated with the first flow channel (101), a plurality of groups of throttling channels (801) communicated with the flow guide holes (701) are axially distributed on the throttling component (8), the first flow channel (101) is communicated with the overflowing cavity (104) sequentially through the flow guide holes (701) and the throttling channels (801), and the medium pressure of the second flow channel (102) is adjusted by controlling the axial position of the valve core (5) to adjust the number of the groups of throttling channels (801) communicated with the overflowing cavity (104).

2. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 1, wherein: the sleeve component (7) comprises a sleeve main body (702) and a flow guide sleeve (703), a first annular groove (704) and a second annular groove (705) are sequentially formed in the periphery of the sleeve main body (702) from outside to inside, the height of the first annular groove (704) is larger than that of the second annular groove (705), the upper end of the flow guide sleeve (703) is embedded in the first annular groove (704), and the lower end of the flow guide sleeve (703) and the lower end of the sleeve main body (702) are both abutted against the throttling component (8); the guide hole (701) is arranged on the guide sleeve (703), and the second annular groove (705) is positioned between the guide hole (701) and the throttling channel (801).

3. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 2, wherein: and the sleeve main body (702) is also provided with a flow passing window (706) which is used for communicating the second annular groove (705) with the flow passing cavity (104).

4. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 2, wherein: the throttling assembly (8) comprises a first throttling element (802), a second throttling element (803) and a third throttling element (804) which are stacked from top to bottom, and the first throttling element (802), the second throttling element (803) and the third throttling element (804) are riveted together through round pins; the upper end face of the first throttling element (802) is provided with a first upper guide groove (8021), the inner side of the first upper guide groove (8021) is provided with a first upper through groove (8022) which is connected with the flow cavity (104), the lower end face of the first throttling element (802) is provided with a first lower guide groove (8023), the inner side of the first lower guide groove (8023) is provided with a first lower through groove (8024) which is connected with the flow cavity (104), the upper end face of the second throttling element (803) is provided with a second upper guide groove (8031) which is superposed with the orthographic projection of the first upper guide groove (8021), the inner side of the second upper guide groove (8031) is provided with a second upper through groove (8032) which is connected with the flow cavity (104), the lower end face of the second throttling element (803) is provided with a second lower guide groove (8033) which is superposed with the orthographic projection of the first lower guide groove (8023), and the inner side of the second lower guide groove (8033) is provided with a second lower through groove (8034) which is connected with, the upper end face of the third throttling element (804) is provided with a third upper guide groove (8041) which is superposed with the orthographic projection of the second upper guide groove (8031), the inner side of the third upper guide groove (8041) is provided with a third upper through groove (8042) which is connected with the flow cavity (104), the lower end face of the third throttling element (804) is provided with a third lower guide groove (8043) which is superposed with the orthographic projection of the second lower guide groove (8033), and the inner side of the third lower guide groove (8043) is provided with a third lower through groove (8044) which is connected with the flow cavity (104); a first upper guide hole (8025) communicated with the second annular groove (705) and the first lower guide groove (8023) and a first lower guide hole (8026) communicated with the first upper guide groove (8021) and the second upper guide groove (8031) are formed in the first throttling element (802), a second upper guide hole (8035) communicated with the first lower guide groove (8023) and the second lower guide groove (8033) and a second lower guide hole (8036) communicated with the second upper guide groove (8031) and the third upper guide groove (8041) are formed in the second throttling element (803), and a third lower guide hole (8045) communicated with the second lower guide groove (8033) and the third lower guide groove (8043) is formed in the third throttling element (804); the first upper guide groove (8021) and the first upper through groove (8022), the first lower guide groove (8023) and the first lower through groove (8024), the second upper guide groove (8031) and the second upper through groove (8032), the second lower guide groove (8033) and the second lower through groove (8034), the third upper guide groove (8041) and the third upper through groove (8042), and the third lower guide groove (8043) and the third lower through groove (8044) form six groups of throttling channels (801).

5. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 4, wherein: the cross-sectional areas of the first upper through groove (8022), the first lower through groove (8024), the second upper through groove (8032), the second lower through groove (8034), the third upper through groove (8042) and the third lower through groove (8044) are reduced in sequence.

6. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 4, wherein: the number of the first upper guide hole (8025), the first lower guide hole (8026), the second upper guide hole (8035) and the second lower guide hole (8036) is reduced in turn.

7. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 4, wherein: the upper end face of the first throttling element (802) is provided with an upper mounting groove (8027) for embedding the bottom end of the flow guide sleeve (703), and the lower end face of the third throttling element (804) is provided with a lower mounting groove (8046) for embedding the top of the valve seat (4).

8. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 1, wherein: sealed chamber (501) have been seted up to the lateral part of case (5), and sealed chamber (501) is embedded to be equipped with and constitutes case (5) outer wall and overflowing chamber (104) lateral wall and form sealed complex O shape circle (502), case (5) still threaded connection has clamping ring (503), and the bottom of clamping ring (503) is equipped with bulge loop (504), bulge loop (504) are pressed O shape circle (502) and are consolidated in sealed chamber (501).

9. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 1, wherein: the valve core (5) is provided with a cavity (505), the bottom end of the valve core (5) is provided with a clamping groove (506) communicated with the cavity (505), a flow blocking disc (507) is embedded in the clamping groove (506), the flow blocking disc (507) is provided with a plurality of first through holes (508), and the upper part of the valve core (5) is provided with a plurality of second through holes (509) which are coaxial with the first through holes (508).

10. The high-pressure low-noise multistage pressure-reducing regulating valve according to claim 1, wherein: the packing seal assembly structure is characterized in that an upper groove body (601) used for installing the packing seal assembly (6) is formed in the valve cover (2), the packing seal assembly (6) comprises a packing gland (602), a first packing layer (603), a packing core sleeve (604), a second packing layer (605) and a packing baffle ring (606) which are sequentially arranged in a laminated mode from top to bottom, a packing pressing plate (607) is arranged on the top of the packing gland (602) in a pressing mode, and the packing pressing plate (607) is fixedly connected with the valve cover (2) through bolts.