Signal conditioning mechanism

Abstract

The present invention provides a signal adjustment mechanism, comprising a base, on which an input cavity, an air source cavity, an output cavity, and a proportional arm are provided. A rotating shaft is slidably provided on the base, and a first strip hole is provided on the proportional arm along its length. The end of the rotating shaft away from the base passes through the first strip hole, and the rotating shaft is rotatable along its own axis. The input cavity and the air source cavity are located at one end of the proportional arm, and the outputs of the input cavity and the air source cavity are connected to the proportional arm, and the input cavity and the air source cavity are located on opposite sides of the proportional arm. The output cavity is provided at the other end of the proportional arm, and the output of the output cavity is connected to the proportional arm. This solution realizes the adjustable input-output ratio.

Description

Technical Field

[0001] The invention belongs to the field of pneumatic technology, and in particular relates to a signal regulating mechanism. Background Art

[0002] Smart valve positioners are essential control accessories for regulating valve actuators. They receive input voltage signals from the controller and convert them into pressure signals for the working medium. However, the medium pressure and flow rate output by the positioner's electrical converter mechanism are insufficient to control the actuator. Therefore, the signal output by the converter is amplified by a signal conditioning mechanism, which outputs a higher flow rate and pressure to control the pneumatic actuator, thereby controlling the control valve. The signal conditioning mechanism in smart valve positioners primarily operates by adjusting the input signal through the principle of force balance, thereby outputting a signal with a higher flow rate and pressure.

[0003] At present, due to the different actual usage scenarios, the input and output signals of the signal adjustment mechanism need to present different ratios. However, in the existing technology, the ratio between the input and output signals of the same signal adjustment mechanism is usually a fixed value, and the ratio between the input and output signals cannot be adjusted, resulting in poor versatility. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a signal adjustment mechanism to solve the above-mentioned problems.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a signal adjustment mechanism, including a base, on which an input cavity, an air source cavity, an output cavity and a proportional arm are provided, a rotating shaft is slidably provided on the base, a first strip hole is opened on the proportional arm along its own length direction, an end of the rotating shaft away from the base passes through the first strip hole, and the rotating shaft can rotate along its own axis; the input cavity and the air source cavity are located at one end of the proportional arm, and the outputs of the input cavity and the air source cavity are connected to the proportional arm, and the input cavity and the air source cavity are located on opposite sides of the proportional arm; the output cavity is arranged at the other end of the proportional arm, and the output of the output cavity is connected to the proportional arm.

[0006] Optionally, an input piston is provided in the input cavity, a first sealing ring is provided between the input piston and the inner wall of the input cavity, an input chamber is formed between the input piston and the inner wall of the input cavity, an input port is provided on the inner wall of the input chamber; the input piston is connected to the proportional arm.

[0007] Optionally, an air source piston is provided in the air source cavity, a second sealing ring is provided between the air source piston and the inner wall of the air source cavity, a first air source chamber is formed between the air source piston and the inner wall of the air source cavity, a first air source port is opened on the inner wall of the first air source chamber, and the air source piston is connected to the proportional arm.

[0008] Optionally, two output cavities are provided, and the output cavities are distributed on opposite sides of the proportional arm.

[0009] Optionally, a valve seat, an exhaust piston valve stem and a spring are provided in the output cavity;

[0010] The valve seat is fixedly connected to the inner wall of the output cavity, and forms a second gas source chamber with the output cavity. A second gas source port is provided on the inner wall of the second gas source chamber, and an air inlet channel is provided on the valve seat.

[0011] The spring is arranged in the second air source chamber, one end of the valve stem abuts against the spring, and the other end of the valve stem passes through the valve seat and abuts against the exhaust piston;

[0012] The exhaust piston is disposed between the valve seat and the fixed plug, an output chamber is formed between the exhaust piston and the valve seat, an output port is provided on the inner wall of the output chamber, and a third sealing ring is provided between the exhaust piston and the inner wall of the output chamber; an exhaust passage is provided on the exhaust piston at a position abutting against the valve stem;

[0013] The fixed plug is fixed on the exhaust piston and connected to the proportional arm. An exhaust chamber is formed between the fixed plug and the exhaust piston. An exhaust port is provided on the inner wall of the exhaust chamber. A fourth sealing ring is provided between the fixed plug and the inner wall of the output chamber.

[0014] Optionally, a fine-tuning stud is provided between the proportional arm and a fixed plug in one of the output cavities. The fine-tuning stud is rotatably mounted on the fixed plug along its own axis, and the fine-tuning stud is threadedly connected to the proportional arm.

[0015] Optionally, a retaining spring is provided on the valve seat for fixing the valve seat on the inner wall of the output cavity.

[0016] Optionally, a second strip-shaped hole is opened on the base, the rotating shaft passes through the first strip-shaped hole and the second strip-shaped hole, and a nut for limiting the rotating shaft on the proportional arm is connected to the rotating shaft.

[0017] As described above, the signal conditioning mechanism of the present invention has the following beneficial effects:

[0018] In this solution, by adjusting the position of the rotating shaft in the first strip hole, the proportional relationship of the air pressure in the input cavity and the output cavity can be changed. That is, by adjusting the position of the rotating shaft, signal amplification and signal reduction can be achieved to meet the needs of different scenarios, effectively improving versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is an axonometric diagram of the signal conditioning mechanism in an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of the internal structure of the signal adjustment mechanism in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The reference numerals in the drawings of the specification include: base 1, second strip-shaped hole 101, input cavity 2, input piston 201, first sealing ring 202, input chamber 203, input port 204, gas source cavity 3, gas source piston 301, second sealing ring 302, first gas source chamber 303, first gas source port 304, output cavity 4, valve seat 401, valve stem 402, spring 403, second gas source chamber 404, second gas source port 405, output cavity 406, output port 407, exhaust Piston 408, fixing plug 409, exhaust port 410, ventilation channel 411, exhaust channel 412, retaining spring 413, output chamber 5, valve seat 501, valve stem 502, spring 503, second air source chamber 504, second air source port 505, output chamber 506, output port 507, exhaust piston 508, fixing plug 509, exhaust port 510, ventilation channel 511, exhaust channel 512, retaining spring 513, proportional arm 6, first strip hole 601, fine-tuning stud 7, nut 8.

[0022] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0023] The signal conditioning mechanism in this application is shown in the attached Figure 1 and attached Figure 2 .

[0024] In an exemplary embodiment of the present application, a signal adjustment mechanism is provided, including a base 1, on which an input cavity 2, an air source cavity 3, an output cavity and a proportional arm 6 are provided. A rotating shaft 7 is slidably provided on the base 1, and a first strip hole 601 is opened on the proportional arm 6 along its own length direction. The end of the rotating shaft 7 away from the base 1 passes through the first strip hole 601, and the rotating shaft 7 can rotate along its own axis; the input cavity 2 and the air source cavity 3 are located at one end of the proportional arm 6, and the outputs of the input cavity 2 and the air source cavity 3 are connected to the proportional arm 6, and the input cavity 2 and the air source cavity 3 are located on opposite sides of the proportional arm 6; the output cavity is arranged at the other end of the proportional arm 6, and the output of the output cavity 6 is connected to the proportional arm.

[0025] In this embodiment, by adjusting the position of the rotating shaft 7 in the first strip hole 601, the proportional relationship of the air pressure in the input cavity 2 and the output cavity can be changed. That is, by adjusting the position of the rotating shaft, signal amplification and signal reduction can be achieved to meet the needs of different scenarios, thereby effectively improving versatility.

[0026] For example, the rotating shaft 7 can be arranged on the base 1 along the Figure 2 Slide horizontally.

[0027] Exemplarily, the base 1 , the input cavity 2 , the gas source cavity 3 , the output cavity, the proportional arm 6 , etc. adopt a metal structure to be suitable for environments such as high temperatures.

[0028] Exemplarily, the inner wall media of the input cavity 2, the gas source cavity 3, the output cavity, etc. can be water, air, or other fluids and gases.

[0029] Exemplarily, the distance between the input cavity and the rotating shaft is greater than the distance between the gas source cavity and the rotating shaft.

[0030] In an exemplary embodiment, an input piston 201 is provided in the input chamber 2, a first sealing ring 202 is provided between the input piston 201 and the inner wall of the input chamber 2, the input piston 201 and the inner wall of the input chamber 2 form an input chamber 203, an input port 204 is opened on the inner wall of the input chamber 203; the input piston 201 is connected to the proportional arm 6.

[0031] In this embodiment, a medium is introduced into the input chamber 2 through the input port 204, causing the input piston 201 to actuate, thereby sealing the input chamber 203 via the first sealing ring 202. In this embodiment, the input piston 201 and the first sealing ring 202 replace the existing diaphragm and rubber ring to adapt to operating environments such as high and low temperatures and radiation.

[0032] In an exemplary embodiment, an air source piston 301 is provided in the air source cavity 3, and a second sealing ring 302 is provided between the air source piston 301 and the inner wall of the air source cavity 3. The air source piston 301 and the air source cavity 3 are placed between the inner wall to form a first air source chamber 303. A first air source port 304 is opened on the inner wall of the first air source chamber 303, and the air source piston 301 is connected to the proportional arm 6.

[0033] In this embodiment, a medium is introduced into the gas source cavity 3 through the first gas source port 304, causing the gas source piston 301 to actuate, thereby sealing the first gas source cavity 303 via the second sealing ring 302. Furthermore, in this embodiment, the gas source piston 301 and the second sealing ring 302 replace the existing diaphragm and rubber ring to adapt to operating environments such as high and low temperatures and radiation.

[0034] In an exemplary embodiment, two output cavities are provided, and the output cavities are distributed on opposite sides of the proportional arm.

[0035] In this embodiment, two output cavities are provided so that the working medium between the two output cavities can be circulated and reused, thereby saving costs.

[0036] In an exemplary embodiment, a valve seat, an exhaust piston, a fixed plug, a valve stem, and a spring are disposed in the output chamber;

[0037] The valve seat is fixedly connected to the inner wall of the output cavity, and a second gas source chamber is formed between the valve seat and the output cavity. A second gas source port is provided on the inner wall of the second gas source chamber, and an air inlet channel is provided on the valve seat.

[0038] The spring is arranged in the second air source chamber, one end of the valve stem abuts against the spring, and the other end of the valve stem abuts against the exhaust piston after passing through the valve seat;

[0039] The exhaust piston is arranged between the valve seat and the fixed plug, and an output chamber is formed between the exhaust piston and the valve seat. An output port is provided on the inner wall of the output chamber, and a third sealing ring is provided between the exhaust piston and the inner wall of the output chamber. An exhaust channel is provided on the exhaust piston at a position where the exhaust piston abuts against the valve stem.

[0040] The fixed plug is fixed on the exhaust piston and connected to the proportional arm. An exhaust chamber is formed between the fixed plug and the exhaust piston. An exhaust port is opened on the inner wall of the exhaust chamber. A fourth sealing ring is provided between the fixed plug and the inner wall of the output chamber.

[0041] When the exhaust passage is opened, the output chamber is communicated with the exhaust chamber, and when the air inlet passage is opened, the second air source chamber is communicated with the output chamber.

[0042] Exemplarily, the signal conditioning mechanism includes an output chamber 4 and an output chamber 5 of identical structure. The output chamber 4 is provided with a valve seat 401, a valve stem 402, a spring 403, a second air source chamber 404, a second air source port 405, an output chamber 406, an output port 407, an exhaust piston 408, a fixing plug 409, an exhaust port 410, an air vent 411, and an exhaust channel 412. The output chamber 5 is provided with a valve seat 501, a valve stem 502, a spring 503, a second air source chamber 504, a second air source port 505, an output chamber 506, an output port 507, an exhaust piston 508, a fixing plug 509, an exhaust port 510, an air vent 511, and an exhaust channel 512.

[0043] When there is no input signal in the input cavity 2 and there is gas input in the output cavity 4, the gas source enters the second gas source chamber 404 from the second gas source port 405. Under the combined action of the gas source pressure and the spring 403, the valve stem 402 and the valve seat 401 fit tightly together.

[0044] When gas enters the first gas source chamber 303 from the first gas source port 304, it pushes the gas source piston 301 out of the gas source chamber 3, thereby causing the proportional arm 6 to rotate about the rotation axis 7. This rotation of the proportional arm 6 drives the exhaust piston 408 and valve stem 402 to move together, opening the inlet channel 411 and closing the corresponding exhaust channel 412. Gas within the second gas source chamber 404 enters the output chamber 406 through the open inlet channel 411, causing the output chamber 406 to have an initial pressure P1. Under the action of pressure P1, the exhaust piston 408 generates a thrust F3 on the proportional arm 6. When the torque generated by thrust F1 on the proportional arm 6 equals the torque generated by thrust F3 on the proportional arm 6, the proportional arm 6 returns to a horizontal position, closing the exhaust channels 412, 512, and the inlet and outlet channels 411 and 511. At this time, the output port 407 outputs the initial pressure P1, and the output port 507 outputs the initial pressure P2.

[0045] When a signal P0 is inputted into the input chamber 203 from the input port 204, the input piston 201 is pushed to move and a force F2 is generated on the proportional arm 6. Initially, when the forces F1, F2, and F3 act together on the proportional arm, the end of the proportional arm connected to the output chamber 4 is deflected toward the output chamber 5 (i.e., deflected clockwise, refer to the attached figure). Figure 2), the exhaust piston 508, under the action of the proportional arm 6, tightly fits the valve stem 502. The valve stem 502 moves toward the output chamber 5 and abuts against the spring 503, closing the exhaust passage 512 and opening the intake passage 511. At this point, gas in the second gas source chamber 504 enters the output chamber 506 through the open intake passage 511, increasing the pressure P2 within the output chamber 506. Under the action of pressure P2, the exhaust piston 508 generates a thrust F4 on the proportional arm 6. Simultaneously, the valve stem 402, under the combined action of the second gas source chamber 404 and the spring 403, tightly fits against the valve seat 401, thereby closing the intake passage 411. Under the action of pressure P1 within the output chamber 406, the exhaust piston 408 moves away from the valve stem 402, thereby opening the exhaust passage 412 within the output chamber 4 and reducing pressure P1. As the pressure P1 decreases and P2 increases, when the torque generated by the forces F1, F2, F3, and F4 on the proportional arm 6 is 0, the proportional arm 6 returns to the middle position (horizontal position, refer to the attached position for orientation). Figure 2 ), the exhaust channel 412, the exhaust channel 512, the intake channel 411, and the intake channel 511 are closed. At this time, the output chamber 506 has a pressure P2*=nP0, and the output chamber 406 has a pressure P1*, P1-P1*=nP0, where n is the proportional coefficient, P2* is the pressure value output by the output port 507, and P1* is the pressure value output by the output port 410.

[0046] As can be seen from the above, by adjusting the installation position of movable shaft 11, the proportional coefficient n can be changed, thereby adjusting the output pressure values ​​of output port 407 and output port 507. Here, n can be greater than 1, less than 1, or equal to 1, meaning that the same signal conditioning mechanism can have both signal amplification and signal reduction functions.

[0047] Exemplarily, the air intake passage is in a bell-mouth shape, and the diameter of the air intake passage gradually decreases from the exhaust piston to the valve seat of the same output cavity.

[0048] In an exemplary embodiment, a fine-tuning stud 514 is provided at the connection position between the proportional arm 6 and the output cavity 5 . The fine-tuning stud 514 is rotatably mounted on the fixing plug 509 along its own axis, and the fine-tuning stud 514 is threadedly connected to the proportional arm 6 .

[0049] When there is no input signal in the input cavity 2, and there is no gas source input in the output cavity 2 and the gas source cavity 3, there is no pressure in each cavity. The fine-tuning screw 514 can be adjusted so that the proportional arm 6 is in the middle position, the input piston 2, the gas source piston 3, and the fixed plug are just in contact with the proportional arm 6, and the exhaust channel 412, the exhaust channel 512, the intake channel 411, and the intake channel 511 are closed.

[0050] In an exemplary embodiment, a retaining spring is provided on the valve seat for fixing the valve seat on the inner wall of the output chamber.

[0051] In this embodiment, the retaining spring is provided to achieve fixed installation of the valve seat.

[0052] Illustratively, the retaining spring 413 in the output chamber 4 fixes the valve seat 401 , and the retaining spring 513 in the output chamber 5 fixes the valve seat 501 .

[0053] In an exemplary embodiment, a second strip-shaped hole 101 is opened on the base, the rotating shaft passes through the first strip-shaped hole 601 and the second strip-shaped hole 101, and a nut 8 for limiting the rotating shaft on the proportional arm is connected to the rotating shaft 7.

[0054] Exemplarily, the second strip-shaped hole 101 is a countersunk hole.

[0055] In this embodiment, the nut 8 is provided to prevent the rotating shaft 7 from being separated from the proportional arm 6 .

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A signal conditioning mechanism, characterized in that: The invention comprises a base, on which an input cavity, an air source cavity, an output cavity and a proportional arm are provided. A rotating shaft is slidably provided on the base. A first strip hole is opened on the proportional arm along its length direction. An end of the rotating shaft away from the base passes through the first strip hole, and the rotating shaft can rotate along its own axis. The input cavity and the air source cavity are located at one end of the proportional arm, and the outputs of the input cavity and the air source cavity are connected to the proportional arm. The input cavity and the air source cavity are located on opposite sides of the proportional arm. The output cavity is provided at the other end of the proportional arm, and the output of the output cavity is connected to the proportional arm. An input piston is disposed in the input cavity, a first sealing ring is disposed between the input piston and the inner wall of the input cavity, an input chamber is formed between the input piston and the inner wall of the input cavity, an input port is formed on the inner wall of the input chamber; the input piston is connected to the proportional arm; An air source piston is provided in the air source cavity, a second sealing ring is provided between the air source piston and the inner wall of the air source cavity, a first air source chamber is formed between the air source piston and the inner wall of the air source cavity, a first air source port is provided on the inner wall of the first air source chamber, and the air source piston is connected to the proportional arm; There are two output cavities, and the output cavities are distributed on opposite sides of the proportional arm; The output cavity is provided with a valve seat, an exhaust piston, a fixing plug, a valve stem and a spring; The valve seat is fixedly connected to the inner wall of the output cavity, and forms a second gas source chamber with the output cavity. A second gas source port is provided on the inner wall of the second gas source chamber, and an air inlet channel is provided on the valve seat. The spring is arranged in the second air source chamber, one end of the valve stem abuts against the spring, and the other end of the valve stem passes through the valve seat and abuts against the exhaust piston; The exhaust piston is disposed between the valve seat and the fixed plug, an output chamber is formed between the exhaust piston and the valve seat, an output port is provided on the inner wall of the output chamber, and a third sealing ring is provided between the exhaust piston and the inner wall of the output chamber; an exhaust passage is provided on the exhaust piston at a position abutting against the valve stem; The fixed plug is fixed on the exhaust piston and connected to the proportional arm. An exhaust chamber is formed between the fixed plug and the exhaust piston. An exhaust port is provided on the inner wall of the exhaust chamber. A fourth sealing ring is provided between the fixed plug and the inner wall of the output chamber.

2. The signal conditioning mechanism according to claim 1, wherein: A fine-tuning stud is provided between the proportional arm and a fixed plug in one of the output cavities. The fine-tuning stud is rotatably mounted on the fixed plug along its own axis. The fine-tuning stud is threadedly connected to the proportional arm.

3. The signal conditioning mechanism according to claim 1, wherein: The valve seat is provided with a clamping spring for fixing the valve seat on the inner wall of the output cavity.

4. The signal conditioning mechanism according to any one of claims 1 to 3, characterized in that: A second strip-shaped hole is formed on the base, the rotating shaft passes through the first strip-shaped hole and the second strip-shaped hole, and a nut for limiting the rotating shaft on the proportional arm is connected to the rotating shaft.

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