Multi-stage depressurization labyrinth sleeve regulating valve

Abstract

The invention discloses a multistage depressurization labyrinth sleeve adjusting valve which comprises a valve body, a valve element, a first gland, a second gland, a first sealing ring, a second sealing ring, a sleeve, a depressurization disc combination, a base, a valve seat and a positioning column. The multiple annular inlets are formed in the outer edge of the sleeve, the fluid is blocked by downward flowing of the fluid from the upper portion in the direction perpendicular to the flowing direction of the fluid at the inlets, meanwhile, the flowing speed and pressure of the fluid are reduced through multiple times of collision with the partition cavity in the inner edge of the sleeve, and the flowing efficiency of the fluid can also be improved through the multiple annular inlets; the flow capacity of the valve is improved; the five independent and equidistantly distributed water-drop-shaped flow channels on the two discs form a series-parallel connection type ascending and descending flow channel together, flow division, confluence, ascending and descending of fluid media are achieved, and therefore the flow velocity of fluid can be reduced, pressure distribution can be stabilized, and the beneficial effects of flow slowing and pressure reducing are achieved.

Description

Technical Field

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

[0002] Multi-stage labyrinth sleeve regulating valves are widely used in industrial fields that require precise flow and pressure control, such as petrochemical, electric power, pharmaceutical, food processing and other industries. The fluid control systems in these fields usually face challenges such as high pressure difference, large flow changes, and complex fluid characteristics.

[0003] Control valves used in high-pressure differential working conditions are prone to harmful phenomena such as cavitation, valve vibration, and valve body fatigue. Long-term high-pressure differential working conditions may also cause fatigue cracks in the valve body, while increasing the wear of the sealing surface and causing leakage. In the face of complex working conditions and harsh operating conditions, in order to increase the service life of the valve, sleeve-type control valves or labyrinth-type control valves are generally used. The sleeve-type control valve adopts a multiple sleeve structure, and each sleeve is responsible for different flow adjustments to achieve precise control of the fluid flow. The multiple pressure drops of the labyrinth-type control valve can effectively control the pressure drop of the fluid. By improving the labyrinth structure and fluid path, the pressure loss and flow rate fluctuation in the fluid flow can be effectively reduced.

[0004] However, the existing traditional valve core structure is easily disturbed by pressure fluctuations, which often causes the valve outlet flow to be unstable, which not only requires more frequent inspection and maintenance, but also increases economic costs, and may also increase system downtime, affecting production efficiency and economic benefits. Therefore, with the emergence of complex working conditions such as high temperature and high pressure, the process industry has an increasingly urgent demand for valves with better pressure reduction effects. Summary of the invention

[0005] The present invention provides a multi-stage pressure-reducing labyrinth sleeve regulating valve, in which a plurality of annular inlets are arranged on the outer edge of the sleeve, and the fluid at the inlet is subjected to a "blocking" effect of the downward flow of the fluid from above in a direction perpendicular to the fluid flow direction, and at the same time, after multiple collisions with the inner edge compartment of the sleeve, the fluid flow rate and pressure are reduced; five independent and equally spaced teardrop-shaped flow channels on two discs jointly form a series-parallel ascending and descending flow channel, realizing the diversion and convergence, ascending and descending of the fluid medium, thereby helping to reduce the fluid flow rate, stabilize the pressure distribution, achieve slow flow and pressure reduction, and improve energy utilization to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: a multi-stage pressure-reducing labyrinth sleeve regulating valve, comprising a valve body and a valve core, and also comprising a first gland, a second gland, a sleeve, a pressure-reducing disc assembly, a base and a valve seat;

[0007] A fluid medium inlet and a fluid medium outlet are respectively arranged on both sides of the valve cavity inside the valve body, and the sleeve and the pressure reducing disc assembly located in the sleeve are arranged in the middle of the valve cavity;

[0008] The outer edge of the sleeve is provided with a plurality of annular inlets from top to bottom, the fluid medium inlet corresponds to the annular inlet, the inner edge of the sleeve is provided with a channel connecting each layer of annular inlets up and down, the inner edge of the sleeve is provided with an annular boss corresponding to each channel, and the inner edge and the outer edge of the sleeve are supported and fixed by two symmetrical supporting rib walls to form a whole annular labyrinth flow channel;

[0009] The pressure-reducing disc assembly is composed of a plurality of units stacked from top to bottom, each unit includes two upper flow channel discs and a lower flow channel disc with the same outer diameter, the upper flow channel disc and the lower flow channel disc are provided with a circular opening with the same diameter at the center, the outer diameter of the valve core is consistent with the diameter of the circular opening, and is located in the upper inner part of the circular opening of the pressure-reducing disc assembly;

[0010] The bottom surface of the upper flow channel disc is provided with a plurality of rows of spaced teardrop-shaped flow channels equally divided around the center, and the top surface of the lower flow channel disc is provided with a plurality of rows of spaced teardrop-shaped flow channels equally divided around the center. The upper flow channel disc is coaxially arranged above the lower flow channel disc, and the teardrop-shaped flow channels on the lower flow channel disc and the teardrop-shaped flow channels on the upper flow channel disc are arranged alternately and spaced, and the head and tail overlap in vertical projection, and each row of the teardrop-shaped flow channels is connected by series-parallel flow channels to form ascending and descending flow channels, and the ascending and descending flow channels penetrate the inner and outer walls of the unit;

[0011] The sleeve is provided with a bottom, which is also provided with a circular opening, a gap is left between the bottom and the inner edge, a gap is left between the outer wall of the pressure-reducing disc assembly and the inner edge of the sleeve, the valve body is provided with the first pressure cover for positioning the sleeve and the upper part of the pressure-reducing disc assembly, the second pressure cover, and the base and the valve seat for positioning the lower part, the first pressure cover and the second pressure cover are provided with a channel for the valve core to be raised and lowered, and the fluid medium outlet is provided in the middle of the base and the valve seat and corresponds to the bottom of the circular opening.

[0012] Preferably, the inner diameter of the top end of the sleeve is smaller than the inner diameter of the inner edge, and the outer diameter of the pressure-reducing disc assembly is consistent with the inner diameter of the top end of the sleeve.

[0013] Preferably, the top end of the sleeve is consistent with the supporting rib wall along the inner diameter.

[0014] Preferably, the sleeve is connected and fixed by means of a positioning column that cooperates with a positioning through hole of the pressure-reducing disc assembly.

[0015] Preferably, the sleeve and the pressure reducing disc assembly are coaxially connected with the second gland and the base through the positioning column.

[0016] Preferably, the annular groove below the base is matched with the annular boss above the valve seat and is coaxially connected.

[0017] Preferably, sealing rings are provided between the first gland and the second gland, and between the valve body and the valve seat, which are a first sealing ring at the top and a second sealing ring at the bottom.

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

[0019] 1. A pressure-reducing disc assembly unit includes a downflow disc and an upflow disc. The five independent and equally spaced drop-shaped flow channels on the two discs together form a series-parallel ascending and descending flow channel, which realizes the diversion and confluence, ascent and descent of the fluid medium, thereby helping to reduce the fluid flow rate, stabilize the pressure distribution, and achieve the beneficial effect of slow flow and pressure reduction.

[0020] 2. The fluid medium flows into the internal annular labyrinth flow channel through multiple annular inlets arranged on the outer edge of the sleeve, and is "blocked" by the downward flow of the fluid from above at the inlet perpendicular to the fluid flow direction. At the same time, after multiple collisions with the inner edge cavity of the sleeve, the beneficial effect of reducing the fluid flow rate and pressure is achieved. More annular inlets can increase the fluid flow efficiency and improve the flow capacity of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic front section diagram of the AA section of a multi-stage pressure-reducing labyrinth sleeve regulating valve proposed by the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the step-down disc assembly;

[0023] Figure 3 It is a top view of the step-down disc assembly;

[0024] Figure 4 It is a schematic diagram of the sleeve structure;

[0025] Figure 5 It is a front view of the sleeve structure;

[0026] Figure 6 It is a top view of the sleeve-pressure-reducing disc combination structure;

[0027] Figure 7 It is a schematic diagram of a front section of a step-down disc assembly unit;

[0028] Figure 8 It is a schematic diagram of the BB section of the sleeve-pressure reducing disc combination structure;

[0029] Fig. 9It is a schematic diagram of the CC section of a multi-stage labyrinth sleeve regulating valve.

[0030] In the figure: 1. valve body, 101. fluid medium inlet, 102. fluid medium outlet, 2. valve core, 3. first pressure cover, 4. second pressure cover, 5. first sealing ring, 6. second sealing ring, 7. sleeve, 8. pressure reducing disc assembly, 801. upper flow channel disc, 802. lower flow channel disc, 9. base, 10. valve seat, 11. positioning through hole, 12. supporting rib wall, 13. annular labyrinth flow channel, 14. ascending and descending flow channels, 15. positioning column, 16. series-parallel flow channels. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-7 The present invention provides a multi-stage pressure-reducing labyrinth sleeve regulating valve, comprising a valve body 1 and a valve core 2, and also comprising a first gland 3, a second gland 4, a sleeve 7, a pressure-reducing disc assembly 8, a base 9 and a valve seat 10;

[0033] The valve body 1 has a fluid medium inlet 101 and a fluid medium outlet 102 on both sides of the valve cavity. The sleeve 7 and the pressure-reducing disc assembly 8 located in the sleeve 7 are arranged in the middle of the valve cavity.

[0034] The outer edge of the sleeve 7 is provided with a plurality of annular inlets from top to bottom, and the fluid medium inlet 101 corresponds to the annular inlets. The fluid medium flows into the internal annular labyrinth flow channel through the plurality of annular inlets provided on the outer edge of the sleeve. The inner edge of the sleeve 7 is provided with a channel connecting each layer of annular inlets up and down. The fluid medium is "blocked" by the downward flow of the fluid from above at the inlet in a direction perpendicular to the fluid flow direction. After multiple collisions with the compartments on the inner edge of the sleeve, the beneficial effect of reducing the fluid flow rate and pressure is achieved. The inner edge of the sleeve 7 is provided with an annular boss corresponding to each channel. The annular boss forms a bent channel above and below the channel, reducing the flow rate when flowing up and down; the inner edge and the outer edge of the sleeve 7 are supported and fixed by two symmetrical supporting rib walls 12 to form the entire annular labyrinth flow channel 13; more annular inlets can increase the fluid flow efficiency and improve the flow capacity of the valve.

[0035] The pressure-reducing disc assembly 8 is composed of a plurality of units stacked from top to bottom. The multi-unit design realizes the diversion of fluid in different units. Each unit includes an upper flow channel disc 801 and a lower flow channel disc 802 with the same outer diameter. The design of the upper and lower discs facilitates the processing of the flow channel in the unit. The upper flow channel disc 801 and the lower flow channel disc 802 are provided with a circular opening with the same diameter in the center. The outer diameter of the valve core 2 is consistent with the diameter of the circular opening and is located in the upper inner part of the circular opening of the pressure-reducing disc assembly 8. The flow size and switch control of the valve are realized by the lifting and lowering of the valve core 2.

[0036] The bottom surface of the upper flow channel disc 801 is provided with two teardrop-shaped flow channels spaced in multiple columns equally around the center, and the top surface of the lower flow channel disc 802 is provided with three teardrop-shaped flow channels spaced in multiple columns equally around the center. The upper flow channel disc 801 is coaxially arranged above the lower flow channel disc 802, and the teardrop-shaped flow channels on the lower flow channel disc 802 are arranged at staggered intervals with the teardrop-shaped flow channels on the upper flow channel disc 801, and the head and tail overlap in vertical projection. Each column of the teardrop-shaped flow channels is connected by a series-parallel flow channel 16 to form an ascending and descending flow channel 14. The ascending and descending flow channels 14 penetrate the inner and outer walls of the unit. The fluid medium whose flow velocity and pressure are reduced multiple times by the labyrinth sleeve will enter the interior of the unit through the entrances of the ascending and descending flow channels 14 of multiple units. The design of the teardrop-shaped flow channel cooperates with the ascending and descending design to realize the diversion and convergence, ascending and descending of the fluid medium, which helps to reduce the fluid flow velocity and stabilize the pressure distribution, so as to achieve the purpose of slow flow and pressure reduction.

[0037] The sleeve 7 is provided with a bottom, and the bottom is also provided with a circular opening, and a gap is left between the bottom and the inner edge, so that the fluid medium first enters from each annular inlet, and flows out from top to bottom through the gap left between the bottom and the inner edge after colliding with the inner edge cavity of the sleeve for many times. A gap is left between the outer wall of the pressure-reducing disc assembly 8 and the inner edge of the sleeve 7. After flowing out, the fluid medium continues to flow from bottom to top into each disc unit through the gap between the pressure-reducing disc assembly 8 and the inner edge of the sleeve 7, further slowing down the flow and reducing pressure. The valve body 1 is provided with the first pressure cover 3, the second pressure cover 4, and the base 9 and the valve seat 10 for positioning the upper part of the sleeve 7 and the pressure-reducing disc assembly 8, and the first pressure cover 3 and the second pressure cover 4 are provided with a channel for the valve core 2 to rise and fall, and the fluid medium outlet 102 is provided in the middle of the base 9 and the valve seat 10 and corresponds to the bottom of the circular opening.

[0038] like Figure 4 As shown, the inner diameter of the top end of the sleeve 7 is smaller than the inner diameter of the inner edge, and the outer diameter of the pressure-reducing disc assembly 8 is consistent with the inner diameter of the top end of the sleeve 7; in this embodiment, the pressure-reducing disc assembly 8 is sealed with the top end of the sleeve 7, and an annular flow channel gap is left between the inner edge for the fluid medium to enter each unit of the disc assembly.

[0039] like Figure 4 As shown, the top end of the sleeve 7 is consistent with the supporting rib wall 12 along the inner diameter; in this embodiment, the stability of the sleeve 7 and the discs of the pressure-reducing disc assembly 8 after assembly is enhanced.

[0040] like Figure 8 As shown, the sleeve 7 is connected and fixed with the positioning through hole 11 of the pressure reducing disc assembly 8 through the positioning column 15; in this embodiment, the upper flow channel disc 801 and the lower flow channel disc 802 are staggered on the positioning column 15 to realize the assembly of each unit, and the positioning column 15 realizes the overall positioning of all discs.

[0041] like Fig. 9 As shown, the sleeve 7 and the pressure reducing disc combination 8 are coaxially connected with the second pressure cover 4 and the base 9 through the positioning column 15; in this embodiment, the second pressure cover 4 and the base 9 position the positioning column 15 up and down, thereby realizing the positioning and assembly of the sleeve 7 and the pressure reducing disc combination 8.

[0042] like Fig. 9 As shown, the annular groove below the base 9 is coaxially connected with the annular boss above the valve seat 10; in this embodiment, the stable positioning between the base 9 and the valve seat 10 is achieved by the cooperation of the annular groove below the base 9 and the annular boss above the valve seat 10.

[0043] like Figure 1 As shown, sealing rings are provided between the first pressure cover 3 and the second pressure cover 4, and between the valve body 1 and the valve seat 10, which are respectively an upper first sealing ring 5 and a lower second sealing ring 6; in this embodiment, the first sealing ring 5 and the second sealing ring 6 are used to improve the sealing performance at the upper and lower ports of the valve body 1.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage pressure-reducing labyrinth sleeve regulating valve, comprising a valve body (1) and a valve core (2), characterized in that: It also includes a first gland (3), a second gland (4), a sleeve (7), a pressure reducing disc assembly (8), a base (9) and a valve seat (10); A fluid medium inlet (101) and a fluid medium outlet (102) are respectively arranged on both sides of the valve cavity inside the valve body (1), and the sleeve (7) and the pressure reducing disc assembly (8) located inside the sleeve (7) are arranged in the middle of the valve cavity; The outer edge of the sleeve (7) is provided with a plurality of annular inlets from top to bottom, the fluid medium inlet (101) corresponds to the annular inlets, the inner edge of the sleeve (7) is provided with a channel for connecting each layer of annular inlets up and down, the inner edge of the sleeve (7) is provided with an annular boss corresponding to each channel, and the inner edge and the outer edge of the sleeve (7) are supported and fixed by two symmetrical supporting rib walls (12) to form an entire annular labyrinth flow channel (13); The pressure reducing disc assembly (8) is composed of a plurality of units stacked from top to bottom, each unit comprising an upper flow channel disc (801) and a lower flow channel disc (802) with the same outer diameter, the upper flow channel disc (801) and the lower flow channel disc (802) are provided with a circular opening with the same diameter at the center, the outer diameter of the valve core (2) is consistent with the diameter of the circular opening, and is located in the upper inner part of the circular opening of the pressure reducing disc assembly (8); The bottom surface of the upper flow channel disc (801) is provided with a plurality of rows of spaced teardrop-shaped flow channels equally divided around the center, and the top surface of the lower flow channel disc (802) is provided with a plurality of rows of spaced teardrop-shaped flow channels equally divided around the center. The upper flow channel disc (801) is coaxially arranged above the lower flow channel disc (802), and the teardrop-shaped flow channels on the lower flow channel disc (802) and the teardrop-shaped flow channels on the upper flow channel disc (801) are arranged alternately and spaced, and overlap each other in vertical projection. Each row of the teardrop-shaped flow channels is connected through a series-parallel flow channel (16) to form an ascending and descending flow channel (14), and the ascending and descending flow channel (14) passes through the inner and outer walls of the unit; The sleeve (7) is provided with a bottom, which is also provided with a circular opening, a gap is left between the bottom and the inner edge, a gap is left between the outer wall of the pressure reducing disc assembly (8) and the inner edge of the sleeve (7), the valve body (1) is provided with the first pressure cover (3) for positioning the upper part of the sleeve (7) and the pressure reducing disc assembly (8), the second pressure cover (4) and the base (9) and the valve seat (10) for positioning the lower part, the first pressure cover (3) and the second pressure cover (4) are provided with a channel for the valve core (2) to be raised and lowered, and the fluid medium outlet (102) is provided in the middle of the base (9) and the valve seat (10) and below the corresponding circular opening.

2. A multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 1, characterized in that: The inner diameter of the top end of the sleeve (7) is smaller than the inner diameter of the inner edge, and the outer diameter of the pressure reducing disc assembly (8) is consistent with the inner diameter of the top end of the sleeve (7).

3. The multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 1, characterized in that: The top end of the sleeve (7) is consistent with the supporting rib wall (12) along the inner diameter.

4. The multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 1, characterized in that: The sleeve (7) is connected and fixedly connected with the positioning through hole (11) of the pressure reducing disc assembly (8) through a positioning column (15).

5. The multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 4, characterized in that: The sleeve (7) and the pressure reducing disc assembly (8) are coaxially connected with the second gland (4) and the base (9) through the positioning column (15).

6. The multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 1, characterized in that: The annular groove below the base (9) is matched with the annular boss above the valve seat (10) and is coaxially connected.

7. The multi-stage pressure-reducing labyrinth sleeve regulating valve according to claim 1, characterized in that: Sealing rings are provided between the first gland (3) and the second gland (4), and between the valve body (1) and the valve seat (10), namely, an upper first sealing ring (5) and a lower second sealing ring (6).

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