Ultrahigh-pressure automatic control damping valve and pressure control method thereof

Abstract

The invention belongs to the technical field of back pressure valves, and particularly relates to an ultrahigh-pressure automatic control damping valve and a pressure control method thereof.The damping valve comprises a valve body, a screw and an adjusting nut which are sequentially communicated, a cavity channel is formed in the valve body, the screw and the adjusting nut, and a sealing head and a linear motion mechanism which are connected are sequentially contained in the cavity channel; a driving mechanism is connected outside the adjusting nut; a cavity is formed in the valve body, a fluid inlet is formed in the valve body, the sealing head is arranged in the cavity, and the fluid inlet is tightly attached to the front end of the sealing head. And a pressure sensor is arranged on a pipeline communicated with the fluid inlet. The method comprises the steps that the pressure value in a valve body is detected, and the detected pressure value is fed back to a control panel; the control panel controls the motor to change the size of a gap between the sealing head and the fluid inlet so as to change the pressure value. The pressure in the valve body is automatically and accurately adjusted, the stability of the pressure is guaranteed, and the abnormal condition caused by unstable pressure is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of back pressure valves, and in particular relates to an ultra-high pressure automatic control damping valve and a pressure control method thereof. Background Art

[0002] With the rapid development of my country's analytical instrument industry, analytical instrument testing is particularly important. Testing is an important link and means in the research and development stage of testing instruments. The pressure resistance index of analytical instruments is also a key indicator, especially with the birth of overpressure instruments, its testing equipment is a key means to test its indicators. However, most of the current back pressure equipment is too manual, and the stability and pressure resistance of the back pressure cannot be guaranteed.

[0003] Prior art CN111927994A discloses an adjustable back pressure valve device for high pressure system and its use method, comprising an upper valve body and a lower valve body connected to each other, a joint is arranged on the top of the upper valve body, a valve seat is arranged in the upper valve body, a sapphire seat is arranged at the bottom of the valve seat, a ruby ​​ball is used as the valve core, and a sapphire seat is used as the valve seat, and the ruby ​​ball and the sapphire seat cooperate to realize the back pressure function. The ruby ​​ball in the prior art cannot withstand the pressure resistance under ultra-high pressure conditions.

[0004] Prior art CN211649241U discloses an ultra-high pressure back pressure valve, which uses a piston rod structure combined with an O-ring and high-strength plastic to form a high-pressure seal. The valve core head usually uses a 40° conical seal, and the back pressure is manually adjusted by an adjusting rod. The accuracy of the adjusting rod of the prior art cannot be guaranteed, which will lead to large pressure fluctuations and cannot ensure stable pressure operation.

[0005] Prior art CN103807473A discloses a back pressure valve, which uses a check rod and a spring structure and a manual regulating valve to achieve pressure regulation; and adds real-time pressure feedback results, and the pressure can be manually adjusted according to the results. This prior art requires manual pressure adjustment, and due to the poor manual adjustment accuracy, the pressure accuracy cannot be guaranteed. Summary of the invention

[0006] In order to solve the above technical problems, the existing back pressure valve cannot withstand the pressure under ultra-high pressure conditions; the back pressure is manually adjusted, the accuracy of the back pressure cannot be guaranteed, the pressure fluctuates greatly, and the stable pressure operation cannot be guaranteed;

[0007] The present invention provides the following technical solutions:

[0008] First,

[0009] The present invention provides an ultra-high pressure automatic control damping valve, comprising a valve body, a screw rod, and an adjusting nut which are connected in sequence, wherein a cavity is formed inside the valve body, the screw rod, and the adjusting nut, wherein a connected sealing head and a linear motion mechanism are sequentially accommodated in the cavity, and a driving mechanism is connected to the outside of the adjusting nut;

[0010] A cavity is provided inside the valve body, a fluid inlet is provided on the valve body, the fluid inlet is communicated with the cavity, a sealing head is provided in the cavity, and the fluid inlet is closely attached to the front end of the sealing head;

[0011] A pressure sensor is provided on the pipeline connected to the fluid inlet; the driving mechanism drives the adjusting nut to move, and the adjusting nut pushes the linear motion mechanism, thereby pushing the sealing head to move back and forth, so that different gaps are formed between the sealing head and the valve body, thereby realizing back pressure.

[0012] Furthermore, it also includes a control board connected to the pressure sensor, and the control board is connected to the motor; the control board is used to receive the pressure value of the pressure sensor, compare the pressure value of the pressure sensor with the preset pressure value in the control board, and control the movement direction of the drive mechanism.

[0013] Furthermore, the linear motion mechanism includes a damping valve push rod, a pressure column, and a spring connected in sequence, and the sealing head is connected to the damping valve push rod, the front end of the damping valve push rod is located in the cavity, the tail end of the damping valve push rod is located in the screw rod, a spring is sleeved on the rod body of the pressure column, and the front ends of the pressure column and the spring are embedded in the screw rod; the rear end of the spring is embedded in the adjusting nut; the damping valve push rod realizes forward and backward movement under the push of the pressure column and the contraction movement of the spring.

[0014] Furthermore, the driving mechanism is a motor, and the adjusting nut is connected to the motor via a coupling.

[0015] Furthermore, it also includes a motor fixing frame, a sliding block, and a guide rail. The bottom of the motor is connected to the motor fixing frame, and the motor fixing frame is installed between two guide rails through the sliding block.

[0016] Furthermore, limit posts are provided at the front and rear of the guide rail.

[0017] Furthermore, the front end of the screw is threadedly connected to the valve body, and the front end of the screw in contact with the valve body is also provided with a primary sealing ring; the rear end of the screw in contact with the valve body is provided with an O-ring.

[0018] Furthermore, a nut is threadedly connected to the outside of the tail end of the screw rod, and the nut is located at the front end of the adjusting nut.

[0019] Furthermore, the fluid inlet of the valve body is connected to the inlet connection terminal through a pipeline; the valve body is also provided with a fluid outlet, the fluid outlet is communicated with the upper part of the cavity, and the fluid outlet of the valve body is connected to the outlet connection terminal through a pipeline.

[0020] Second,

[0021] The present invention provides a pressure control method for an ultra-high pressure automatic control damping valve, comprising the following steps:

[0022] The pressure sensor detects the pressure value of the flow path flowing into the valve body, and feeds back the detected pressure value to the control board;

[0023] The control panel compares the detected pressure value with the set pressure value to obtain the pressure deviation result;

[0024] When the pressure value fed back by the pressure sensor is lower than the set pressure value, the control board controls the motor to drive the linear motion mechanism to move forward, narrowing the gap between the sealing head and the fluid inlet, and increasing the pressure value in the valve body until the pressure value fed back by the pressure sensor is equal to the set pressure value, and the motor stops moving;

[0025] When the pressure value fed back by the pressure sensor is greater than the set pressure value, the control board controls the motor to drive the linear motion mechanism to move backward, increasing the gap between the sealing head and the fluid inlet, and reducing the pressure value in the valve body until the pressure value fed back by the pressure sensor is equal to the set pressure value, and the motor stops moving.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The ultra-high pressure automatic control damping valve provided by the present invention uses a pressure sensor to feedback the pressure in real time, drives the adjustment nut to move through a driving mechanism, and the adjustment nut pushes the linear motion mechanism, thereby pushing the sealing head to move forward and backward, so that different gaps are formed between the sealing head and the valve body, thereby realizing back pressure and realizing automatic pressure adjustment. The present invention has the characteristics of high precision and automatic adjustment, so that the pressure is stable at a certain set value, ensuring the stability of the pressure and eliminating abnormal conditions caused by unstable pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the side-cut structure of the damping valve body of the present invention;

[0029] Figure 2 It is a side cutaway view of the overall structure of the ultra-high pressure automatic control damping valve of the present invention;

[0030] Figure 3 It is a schematic top view of the overall structure of the ultra-high pressure automatic control damping valve of the present invention;

[0031] Description of reference numerals:

[0032] 1 is the valve body; 101 is the cavity; 2 is the sealing head; 3 is the screw; 4 is the damping valve push rod; 5 is the pressure column; 6 is the adjustment nut; 7 is the coupling; 8 is the motor; 801 is the output shaft; 802 is the motor fixing bracket;

[0033] 9 is a primary sealing ring; 10 is an O-ring; 11 is a nut; 12 is a spring; 13 is a guide rail; 14 is a slider; 15 is a front limit column; 16 is a rear limit column; 17 is a fluid inlet; 1701 is an inlet connection terminal; 18 is a fluid outlet; 1801 is an outlet connection terminal; 19 is a pressure sensor; and 20 is a control board. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the protection scope of the present invention.

[0035] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “horizontal”, “left”, “right”, “front”, “back”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] Combination Figure 1-3 As shown, the present invention provides an ultra-high pressure automatic control damping valve, including a damping valve body, a damping valve support structure, and a damping valve automatic control system. The damping valve body includes a valve body 1, a cavity 101 is provided inside the valve body 1, a fluid inlet 17 and a fluid outlet 18 are provided on the valve body 1, the fluid inlet 17 is connected to the front end of the cavity 101, and the fluid outlet 18 is connected to the upper part of the cavity 101; a sealing head 2 is installed in the cavity 101, and the fluid inlet 17 is closely attached to the front end of the sealing head 2. The fluid inlet 17 is used to introduce the fluid to be controlled. The fluid outlet 18 is used to output the fluid after the damping adjustment.

[0037] The rear end of the sealing head 2 is connected to a damping valve push rod 4, the front end of which is sleeved on the rear end of the sealing head 2; the front end of the damping valve push rod 4 is located in the cavity 101, and the tail end of the damping valve push rod 4 is located in the screw 3. The screw 3 is a hollow structure, and the interior of the screw 3 is connected to the cavity 101.

[0038] The front end of the screw rod 3 is threadedly connected to the valve body 1. The front end of the screw rod 3 in contact with the valve body 1 is also provided with a primary sealing ring 9, and the rear end of the screw rod 3 in contact with the valve body 1 is provided with an O-ring 10. The screw rod 3 is fixed to the valve body 1 through the thread, the primary sealing ring 9 and the O-ring 10, which improves the sealing performance of the connection between the screw rod 3 and the valve body 1 and prevents fluid leakage. The rear end of the screw rod 3 is threadedly connected to the nut 11 and the adjustment nut 6 in sequence.

[0039] The tail end of the damping valve push rod 4 is connected to the head of the pressure column 5, a spring 12 is sleeved on the rod body of the pressure column 5, and the front ends of the pressure column 5 and the spring 12 are embedded in the screw 3. The rear end of the spring 12 is embedded in the adjustment nut 6. The damping valve push rod 4 is pushed by the pressure column 5 and the spring 12 contracts to realize forward and backward movement.

[0040] The rear end of the adjusting nut 6 is connected to a motor 8 through a coupling 7. The output shaft 801 of the motor 8 is connected to the coupling 7. Driven by the motor 8, the adjusting nut 6 moves forward and backward, causing the spring 12 to contract and deform, thereby driving the pressure column 5 to push the damping valve push rod 4, so that different gaps are formed between the sealing head 2 and the valve body 1, thereby realizing back pressure.

[0041] In a specific embodiment, the fluid inlet 17 of the valve body 1 is connected to an inlet connection terminal 1701 through a pipeline, and the fluid outlet 18 of the valve body 1 is connected to an outlet connection terminal 1801 through a pipeline.

[0042] The damping valve support structure includes a motor fixing frame 802 , a slider 14 , a guide rail 13 , and a limiting column. The motor fixing frame 802 is connected to the bottom of the motor 8 , and the motor fixing frame 802 is installed between the two guide rails 13 through the slider 14 .

[0043] In a specific embodiment, the guide rail 13 is provided with limit posts at the front and rear, namely a front limit post 15 and a rear limit post 16. The limit posts are used to prevent the slider 14 from sliding out of the guide rail 13 when an abnormality occurs.

[0044] The damping valve automatic control system comprises a pressure sensor 1, a control panel 20, and a key display screen (not shown in the figure).

[0045] A pressure sensor 19 is provided on the pipeline connecting the fluid inlet 17 and the inlet connection terminal 1701 for real-time monitoring of the flow path pressure flowing into the valve body 1. The pressure sensor 19 is connected to a control board 20, which is connected to a key display screen and is connected to the motor 8.

[0046] The control panel 20, as a control center, receives the pressure value of the pressure sensor 19 in real time, and compares the pressure value of the pressure sensor 19 with a preset pressure value. According to the comparison result, the control panel 20 controls the movement direction of the motor 8 to change the pressure of the fluid in the valve body 1. The key display screen can not only display the pressure value fed back by the pressure sensor 19 in real time, but also set the preset pressure value through the key display screen.

[0047] In order to automatically control the motor to adjust the system pressure to a set pressure value, an automatic control algorithm needs to be used. PID control is an automatic control algorithm commonly used in industry, and the present invention uses an incremental PID algorithm for pressure regulation.

[0048] Working principle of the present invention:

[0049] The fluid enters the valve body 1 through the inlet connection terminal 1701, and the pressure sensor 19 can feedback the flow path pressure change in real time and send the data to the control board 20 in real time;

[0050] When the pressure feedback from the pressure sensor 19 is less than the set pressure value, the control board 20 controls the motor 8 to rotate forward, driving the adjustment nut 6 to move forward, thereby compressing the spring 12. The compression of the spring 12 will push the pressure column 5 and the damping valve push rod 4 forward, causing the gap between the sealing head 2 and the fluid inlet 17 to gradually narrow. This change will increase the resistance to fluid flow, thereby increasing the fluid pressure;

[0051] When the pressure fed back by the pressure sensor 19 is greater than the set pressure value, the control board 20 controls the motor 8 to reverse, driving the adjustment nut 6 to move backward, releasing the compression force of the spring 12. The extension of the spring 12 will push the pressure column 5 and the damping valve push rod 4 to move backward, causing the gap between the sealing head 2 and the fluid inlet 17 to gradually increase. This change will reduce the resistance to fluid flow, thereby reducing the fluid pressure.

[0052] The pressure sensor 19 feeds back the pressure value to the control panel 29 in real time, and the motor 8 will also react in real time to adjust the left and right running distance to control the pressure to be stable.

[0053] Since the present invention adopts rigid connection and the sealing head is a high-pressure resistant component, the present invention can withstand ultra-high pressure systems above 100 MPa and meet the use requirements of high-pressure systems.

[0054] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0055] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. An ultra-high pressure automatic control damping valve, characterized in that: The invention comprises a valve body (1), a screw rod (3) and an adjusting nut (6) which are connected in sequence, wherein the valve body (1), the screw rod (3) and the adjusting nut (6) form a cavity inside, wherein a connected sealing head (2) and a linear motion mechanism are sequentially accommodated in the cavity, and a driving mechanism is connected to the outside of the adjusting nut (6); A cavity (101) is provided inside the valve body (1), a fluid inlet (17) is provided on the valve body (1), the fluid inlet (17) is communicated with the cavity (101), the sealing head (2) is arranged in the cavity (101), and the fluid inlet (17) is closely attached to the front end of the sealing head (2); A pressure sensor (19) is provided on a pipeline connected to the fluid inlet (17); a driving mechanism drives the adjusting nut (6) to move, and the adjusting nut (6) pushes the linear motion mechanism, thereby pushing the sealing head (2) to move forward and backward, so that different gaps are formed between the sealing head (2) and the valve body (1), thereby realizing back pressure.

2. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: It also includes a control board (20) connected to the pressure sensor (19), and the control board (20) is connected to the motor (8); the control board (20) is used to receive the pressure value of the pressure sensor (19) and control the movement direction of the driving mechanism.

3. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: The linear motion mechanism comprises a damping valve push rod (4), a pressure column (5), and a spring (12) which are connected in sequence, and a sealing head (2) is connected to the damping valve push rod (4); the front end of the damping valve push rod (4) is located in a cavity (101), the rear end of the damping valve push rod (4) is located in a screw rod (3), a spring (12) is sleeved on the rod body of the pressure column (5), and the front ends of the pressure column (5) and the spring (12) are embedded in the screw rod (3); the rear end of the spring (12) is embedded in an adjusting nut (6); the damping valve push rod (4) is pushed by the pressure column (5) and the spring (12) contracts, so as to realize forward and backward movement.

4. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: The driving mechanism is a motor (8), and the adjusting nut (6) is connected to the motor (8) via a coupling (7).

5. The ultra-high pressure automatic control damping valve according to claim 4, characterized in that: It also comprises a motor fixing frame (802), a sliding block (14) and a guide rail (13); the motor fixing frame (802) is connected to the bottom of the motor (8); and the motor fixing frame (802) is installed between two guide rails (13) via the sliding block (14).

6. The ultra-high pressure automatic control damping valve according to claim 5, characterized in that: The guide rail (13) is provided with limit posts at the front and rear.

7. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: The front end of the screw rod (3) is threadedly connected to the valve body (1), and the front end of the screw rod (3) in contact with the valve body (1) is also provided with a primary sealing ring (9); the rear end of the screw rod (3) in contact with the valve body (1) is provided with an O-ring (10).

8. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: The rear end of the screw rod (3) is also threadedly connected to a nut (11), and the nut (11) is located at the front end of the adjustment nut (6).

9. The ultra-high pressure automatic control damping valve according to claim 1, characterized in that: The fluid inlet (17) of the valve body (1) is connected to an inlet connection terminal (1701) via a pipeline; a fluid outlet (18) is also provided on the valve body (1), the fluid outlet (18) is communicated with the upper part of the cavity (101), and the fluid outlet (18) is connected to an outlet connection terminal (1801) via a pipeline.

10. A method for controlling pressure of an ultra-high pressure automatic control damping valve, characterized in that: The steps include: The pressure sensor (19) detects the pressure value of the flow path flowing into the valve body (1), and feeds back the detected pressure value to the control board (20); The control panel (20) compares the detected pressure value with the set pressure value to obtain a pressure deviation result; When the pressure value fed back by the pressure sensor (19) is less than the set pressure value, the control panel (20) controls the motor (8) to drive the linear motion mechanism to move forward, thereby reducing the gap between the sealing head (2) and the fluid inlet (17) and increasing the pressure value in the valve body (1) until the pressure value fed back by the pressure sensor (19) is equal to the set pressure value, and the motor stops moving; When the pressure value fed back by the pressure sensor (19) is greater than the set pressure value, the control board (20) controls the motor (8) to drive the linear motion mechanism to move backward, thereby increasing the gap between the sealing head (2) and the fluid inlet (17) and reducing the pressure value in the valve body (1) until the pressure value fed back by the pressure sensor (19) is equal to the set pressure value and the motor stops moving.

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