Tandem multi-stage depressurization regulating valve

Abstract

The utility model belongs to the field of regulating valves, particularly relates to a string type multi-stage depressurization regulating valve, and aims to solve the problems that the number of existing depressurization layers is large, the depressurization layers are in a fixed state and cannot be regulated, and when the flow speed and the pressure intensity of fluid are increased, the pressure borne by each depressurization layer is increased, so that the abrasion of the depressurization layers is accelerated, the string type multi-stage depressurization regulating valve comprises a regulating valve, the adjusting valve comprises a valve body and a valve cover installed at the top of the valve body, an inner cavity is formed in the valve body, an inlet channel communicated with the inner cavity is formed in one side of the valve body, an outlet channel communicated with the inner cavity is formed in the other side of the valve body, and an upper valve element is controlled by a driving device to move up and down. Therefore, the closed state of the regulating valve can be realized, and the number of layers of fluid passing through the pressure reduction layer can be regulated, so that the actual operation and the regulation of the flow velocity of the fluid can be better facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a series multi-stage pressure-reducing regulating valve. Background Art

[0002] With the continuous development of industrial technology, fluid control technology plays an increasingly important role in many fields, especially in high-pressure fluid processing systems, where it is necessary to install a pressure-reducing regulating valve to reduce fluid pressure and achieve flow control;

[0003] The existing pressure reducing regulating valve still has the following problems when in use:

[0004] The existing regulating valve is equipped with multiple pressure reduction layers inside. When the fluid passes through the pressure reduction layer, the pressure is reduced and the speed is slowed down, and then it is discharged. However, the number of pressure reduction layers is mostly fixed and cannot be adjusted. When the flow rate and pressure of the fluid increase, the pressure on each pressure reduction layer will increase, thereby accelerating its wear. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art that the number of pressure reduction layers is mostly fixed and cannot be adjusted. When the flow rate and pressure of the fluid increase, the pressure on each pressure reduction layer will increase, thereby accelerating its wear. A series multi-stage pressure reduction regulating valve is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cascade multi-stage pressure-reducing regulating valve comprises a regulating valve, wherein the regulating valve comprises a valve body and a valve cover installed on the top of the valve body, wherein an inner cavity is arranged inside the valve body, an inlet channel connected to the inner cavity is arranged on one side of the valve body, and an outlet channel connected to the inner cavity is arranged on the other side of the valve body;

[0008] A valve cage is used to guide the fluid. The valve cage is arranged in the inner cavity of the valve body. Six pressure-reducing layers are provided in the valve cage. Four upper discharge holes are provided on the valve cage above the pressure-reducing layers. The fourth pressure-reducing layer of the valve cage from bottom to top is provided with four lower discharge holes.

[0009] The upper valve core and the lower valve core are used to control the flow and opening and closing of the regulating valve. The upper valve core and the lower valve core are both located inside the valve cage. The lower valve core cooperates with the four pressure-reducing layers of the valve cage from bottom to top. The bottom end of the lower valve core is connected to the lower valve stem. The upper valve core cooperates with the two pressure-reducing layers of the valve cage from top to bottom. The top end of the upper valve core is connected to the upper valve stem.

[0010] The driving device is used for driving the upper valve stem to move, and the driving device is located above the regulating valve.

[0011] In a possible design, a packing is provided on the inner wall of the valve cover, and the upper valve stem passes through the valve cover and cooperates with the packing, and a pressing sleeve and a pressing cover are installed on the top of the valve cover.

[0012] In a possible design, a valve seat is installed between the bottom inner wall of the valve body and the bottom of the valve cage, and gaskets are provided on the top and bottom of the valve seat.

[0013] In one possible design, the driving device includes a housing, a motor, a worm, a worm wheel, a nut and a lead screw. The housing is mounted on the top of the valve cover via two columns, the motor is arranged on the bottom inner wall of the housing, the worm is fixedly connected to the output end of the motor, the worm wheel is meshed with the worm, the nut is arranged on the top of the worm wheel, the lead screw thread is arranged on the inner wall of the nut, and the bottom end of the lead screw passes through the housing and is connected to the top end of the upper valve stem.

[0014] In one possible design, a bottom cavity located below the inner cavity is opened inside the valve body, the bottom end of the lower valve stem passes through the bottom cavity, a bottom plate is fixedly provided on one end of the lower valve stem located inside the bottom cavity, a compression spring is sleeved on the outer wall of the lower valve stem located inside the bottom cavity, and the two ends of the compression spring are respectively fixed on the top inner wall of the bottom cavity and the top of the bottom plate.

[0015] In a possible design, a recess is formed at the top of the lower valve core, and a convex surface is formed at the bottom end of the upper valve core, and the convex surface extends to the inside of the recess.

[0016] In a possible design, four connecting rods are fixedly provided at the bottom end of the outer wall of the upper valve core, and the four connecting rods are all located in the pressure reduction layer on the same layer close to the lower discharge hole, a baffle is fixedly provided at the other end of the connecting rod, a slot is provided on the bottom inner wall of the lower discharge hole, and the adjacent baffles extend into the interior of the slot, and four grooves are provided on the inner wall of the pressure reduction layer close to the baffle, and the four grooves respectively cooperate with the four connecting rods.

[0017] In the present application, the fluid enters the interior of the valve body from the inlet channel, and then the fluid will squeeze the bottom end of the lower valve core, causing the lower valve core to move upward (the lower valve core drives the lower valve stem to move upward, so that the compression spring will be squeezed, and when the compression spring reaches the state of ultimate compression, the lower valve stem will not be able to move upward). At this time, the fluid will gradually enter the four pressure reduction layers through the opening at the bottom of the valve cage. When the fluid enters the fourth pressure reduction layer from bottom to top, the upper valve core at the top blocks the flow holes of the upper two pressure reduction layers, making it impossible to continue to move upward, so that the fluid enters the cavity between the outer wall of the valve cage and the inside of the valve body through the lower discharge hole, and then flows out through the outlet channel;

[0018] In specific use, the output end of the motor drives the worm to rotate, the worm drives the worm wheel to rotate, the worm wheel drives the nut to rotate, the nut drives the screw rod to move up and down, the screw rod drives the upper valve stem to move up and down, and when the regulating valve needs to be closed, Figure 2 On the basis of the original, the upper valve stem is driven downward by the control motor, and the upper valve stem drives the upper valve core to move downward, so that the convex surface at the bottom end of the upper valve core contacts the bottom inner wall of the notch at the top of the lower valve core, so that the notch cannot move upward by the extrusion of the fluid, thereby closing the regulating valve. When the number of pressure reduction layers needs to be increased, Figure 2 On the basis of the original, the upper valve stem is driven upward by the control motor, and the upper valve stem drives the upper valve core to move upward, so that the two upper pressure reduction layers are opened, and while the upper valve core moves upward, the baffle is driven upward by the connecting rod, so that the baffle blocks the lower discharge hole, and the fluid continues to pass through the two upper pressure reduction layers and then enters the cavity between the outer wall of the valve cage and the inside of the valve body through the upper discharge hole, and then is discharged through the outlet channel, thereby achieving the goal of reducing the pressure reduction amplitude that each pressure reduction layer will be subjected to by controlling the number of pressure reduction layers, thereby producing a certain regulation ability for the pressure reduction of the fluid.

[0019] In the utility model, the series multi-stage pressure reduction regulating valve can achieve that in the initial state, the fluid will pass through the lower valve core to pass through the four pressure reduction layers below to be discharged after pressure reduction, and when the number of pressure reduction layers needs to be increased, the upper valve core is moved upward to open the two pressure reduction layers above, so that the fluid continues to pass through the two pressure reduction layers above and then is discharged, thereby achieving the effect of adjusting the number of pressure reduction layers;

[0020] In the utility model, the tandem multi-stage pressure-reducing regulating valve can achieve the effect of controlling the upper valve stem connected to the upper valve core to move up and down by driving the motor through the driving device, thereby realizing the opening of the upper pressure-reducing layer and the closing of the regulating valve as a whole;

[0021] In the utility model, when in use, after the fluid enters the interior of the regulating valve through the inlet channel, it will be depressurized by the four depressurization layers below and then discharged through the outlet channel, thereby achieving the depressurization effect;

[0022] By controlling the upper valve core to move up and down through the driving device, the closed state of the regulating valve can be achieved and the number of pressure reduction layers through which the fluid passes can be adjusted, thereby better facilitating actual operation and adjusting the flow rate of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the tandem multi-stage pressure-reducing regulating valve proposed by the utility model;

[0024] Figure 2It is a cross-sectional structural diagram of the series multi-stage pressure-reducing regulating valve proposed by the utility model;

[0025] Figure 3 For this utility model Figure 2 A magnified view of the structure of part A;

[0026] Figure 4 This is a schematic cross-sectional structure diagram of a serial multi-stage pressure-reducing regulating valve driving device proposed by the utility model.

[0027] In the figure: 1. regulating valve; 2. driving device; 3. valve body; 4. lower valve stem; 5. bottom cavity; 6. bottom plate; 7. compression spring; 8. inlet channel; 9. valve seat; 10. lower valve core; 11. valve cage; 12. upper valve core; 13. packing; 14. valve cover; 15. upper valve stem; 16. column; 17. pressure cover; 18. pressure sleeve; 19. upper discharge hole; 20. outlet channel; 21. groove; 22. lower discharge hole; 23. notch; 24. slot; 25. baffle; 26. connecting rod; 27. housing; 28. screw; 29. ​​worm gear; 30. motor; 31. nut; 32. worm. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Example 1

[0030] Reference Figure 1-2 , a series multi-stage step-down regulating valve, which is used in the field of regulating valves, includes: a valve body 3 and a valve cover 14, the valve body 3 is designed with an inner cavity for fluid to pass through, the inlet channel 8 and the outlet channel 20 are respectively located on both sides of the valve body 3, and are connected with the inner cavity to realize the inlet and outlet of the fluid.

[0031] Reference Figure 2-3 The valve cage 11 is located in the inner cavity of the valve body 3 and has six pressure reducing layers therein for gradually reducing the pressure of the fluid. Four upper discharge holes 19 are provided above the valve cage 11, and four lower discharge holes 22 are provided in the fourth pressure reducing layer.

[0032] The flow rate and opening and closing of the regulating valve 1 are controlled by the upper valve core 12 and the lower valve core 10. The lower valve core 10 cooperates with the four pressure-reducing layers of the valve cage 11, while the upper valve core 12 cooperates with the two pressure-reducing layers of the valve cage 11. The upper valve core 12 and the lower valve core 10 are driven by the upper valve stem 15 and the lower valve stem 4 respectively to realize their movement in the valve cage 11.

[0033] The bottom end of the lower valve stem 4 extends into the bottom cavity 5 and is connected to the bottom plate 6 via a compression spring 7 .

[0034] Specifically, refer to Figure 2 , the fluid enters the interior of the valve body 3 from the inlet channel 8, and then the fluid will squeeze the bottom end of the lower valve core 10, causing the lower valve core 10 to move upward (the lower valve core 10 drives the lower valve stem 4 to move upward, so that the compression spring 7 will be squeezed, and when the compression spring 7 reaches the state of ultimate compression, the lower valve stem 4 will not be able to move upward). At this time, the fluid will gradually enter the four pressure reduction layers through the opening at the bottom of the valve cage 11. When the fluid enters the fourth pressure reduction layer from bottom to top, the upper valve core 12 above blocks the flow holes of the two pressure reduction layers above, making it impossible to continue to move upward, so that the fluid enters the cavity between the outer wall of the valve cage 11 and the inside of the valve body 3 through the lower discharge hole 22, and then flows out through the outlet channel 20.

[0035] Reference Figure 4 The driving device 2 is installed above the regulating valve 1, and the motor 30 drives the worm 32 to rotate, thereby driving the worm wheel 29 to rotate. The nut 31 on the top of the worm wheel 29 is connected to the upper valve stem 15 through the screw rod 28 to realize the movement control of the upper valve core 12.

[0036] The upper valve stem 15 is slidably installed inside the valve body 3 .

[0037] Reference Figure 3 The bottom end of the upper valve core 12 is provided with a convex surface, which cooperates with the concave groove 23 at the top of the lower valve core 10.

[0038] Specifically, in Figure 2 On the basis of the original, by controlling the motor 30 to drive the upper valve stem 15 to move downward, the upper valve stem 15 drives the upper valve core 12 to move downward, so that the convex surface at the bottom end of the upper valve core 12 contacts the bottom inner wall of the recess 23 at the top of the lower valve core 10, so that the recess 23 cannot move upward by the extrusion of the fluid, thereby closing the regulating valve 1. When a certain pressure reduction effect needs to be increased, Figure 2 On the basis of the original, the upper valve stem 15 is driven to move upward by controlling the motor 30, and the upper valve stem 15 drives the upper valve core 12 to move upward, so that the two upper pressure reduction layers are opened, and while the upper valve core 12 moves upward, the baffle 25 is driven to move upward through the connecting rod 26, so that the baffle 25 blocks the lower discharge hole 22, and the fluid continues to pass through the two upper pressure reduction layers and then enters the cavity between the outer wall of the valve cage 11 and the inside of the valve body 3 through the upper discharge hole 19, and then is discharged through the outlet channel 20, thereby achieving the goal of reducing the pressure reduction amplitude that each pressure reduction layer will be subjected to by controlling the number of pressure reduction layers, thereby producing a certain regulation ability for the pressure reduction of the fluid.

[0039] Example 2

[0040] refer to Figure 1, improved on the basis of Example 1: the design of the valve cover 14 takes sealing into consideration, and a packing 13 is provided on its inner wall to cooperate with the upper valve stem 15 to achieve sealing. At the same time, the installation of the pressure sleeve 18 and the pressure cover 17 further enhances the sealing effect.

[0041] A valve seat 9 is installed between the bottom inner wall of the valve body 3 and the bottom of the valve cage 11, and a gasket is provided to enhance the sealing performance.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Serial multi-stage pressure reducing regulating valve, characterized in that: include: A regulating valve (1), the regulating valve (1) comprising a valve body (3) and a valve cover (14) mounted on the top of the valve body (3), the valve body (3) being provided with an inner cavity, one side of the valve body (3) being provided with an inlet channel (8) communicating with the inner cavity, and the other side of the valve body (3) being provided with an outlet channel (20) communicating with the inner cavity; A valve cage (11) for guiding a fluid, the valve cage (11) being arranged in an inner cavity of a valve body (3), the valve cage (11) being provided with six pressure reducing layers, the valve cage (11) being provided with four upper discharge holes (19) located above the pressure reducing layers, and the fourth pressure reducing layer of the valve cage (11) being provided with four lower discharge holes (22); The upper valve core (12) and the lower valve core (10) are used to control the flow rate and opening and closing of the regulating valve (1). The upper valve core (12) and the lower valve core (10) are both located inside the valve cage (11). The lower valve core (10) cooperates with the four pressure-reducing layers of the valve cage (11) from bottom to top. The bottom end of the lower valve core (10) is connected to the lower valve stem (4). The upper valve core (12) cooperates with the two pressure-reducing layers of the valve cage (11) from top to bottom. The top end of the upper valve core (12) is connected to the upper valve stem (15); The driving device (2) is used for driving the upper valve stem (15) to move, and the driving device (2) is located above the regulating valve (1).

2. The cascade multi-stage pressure-reducing regulating valve according to claim 1, characterized in that: The inner wall of the valve cover (14) is provided with a packing (13), and the upper valve stem (15) passes through the valve cover (14) and cooperates with the packing (13), and the top of the valve cover (14) is installed with a pressing sleeve (18) and a pressing cover (17).

3. The cascade multi-stage pressure-reducing regulating valve according to claim 2, characterized in that: A valve seat (9) is installed between the bottom inner wall of the valve body (3) and the bottom of the valve cage (11), and gaskets are arranged on the top and bottom of the valve seat (9).

4. The cascade multi-stage pressure-reducing regulating valve according to claim 3, characterized in that: The driving device (2) comprises a housing (27), a motor (30), a worm (32), a worm wheel (29), a nut (31) and a screw (28); the housing (27) is mounted on the top of the valve cover (14) via two columns (16); the motor (30) is arranged on the bottom inner wall of the housing (27); the worm (32) is fixedly connected to the output end of the motor (30); the worm wheel (29) is meshed with the worm (32); the nut (31) is arranged on the top of the worm wheel (29); the screw (28) is threadedly arranged on the inner wall of the nut (31); the bottom end of the screw (28) passes through the housing (27) and is connected to the top end of the upper valve stem (15).

5. The cascade multi-stage pressure-reducing regulating valve according to claim 4, characterized in that: The valve body (3) is provided with a bottom cavity (5) located below the inner cavity. The bottom end of the lower valve stem (4) extends into the bottom cavity (5). A bottom plate (6) is fixedly provided at one end of the lower valve stem (4) located inside the bottom cavity (5). A compression spring (7) is sleeved on the outer wall of the lower valve stem (4) located inside the bottom cavity (5), and the two ends of the compression spring (7) are respectively fixedly provided on the top inner wall of the bottom cavity (5) and the top of the bottom plate (6).

6. The cascade multi-stage pressure reducing regulating valve according to claim 5, characterized in that: The top of the lower valve core (10) is provided with a recess (23), and the bottom end of the upper valve core (12) is provided with a convex surface, and the convex surface extends to the inside of the recess (23).

7. The cascade multi-stage pressure reducing regulating valve according to claim 6, characterized in that: Four connecting rods (26) are fixedly provided at the bottom end of the outer wall of the upper valve core (12), and the four connecting rods (26) are all located in the same pressure reduction layer close to the lower discharge hole (22). A baffle (25) is fixedly provided at the other end of the connecting rod (26). A slot (24) is provided on the bottom inner wall of the lower discharge hole (22), and the adjacent baffles (25) extend to the inside of the slot (24). Four grooves (21) are provided on the inner wall of the pressure reduction layer close to the baffle (25), and the four grooves (21) respectively cooperate with the four connecting rods (26).

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