A large flow valve body for a pneumatic valve positioner

Abstract

The application provides a large flow valve body for a pneumatic valve positioner, which comprises a stepping motor, a busbar and two single valves, the two single valves are mirror installed with the busbar as the center; the stepping motor is connected with the rotating shafts of the two single valves; wherein each single valve comprises a body, a rotating shaft, a shaft sleeve, an air inlet slide valve, an air outlet slide valve, an air source through hole and a flow adjusting slider, etc.; the large flow valve body has three positions, namely A port air inlet and B port air outlet, B port air inlet and A port air outlet and an intermediate position with both A port and B port being sealed and not conductive; in the air inlet and outlet process, the linear regulation of the air inlet flow is realized through the cooperation between the stepping motor, the rotating shaft, the shaft sleeve, the air inlet slide valve, the air outlet slide valve and the flow adjusting slider, so that the control precision of the controller is improved and the adjusting difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve body, in particular to a large flow valve body for pneumatic valve positioner. BACKGROUND

[0002] The pneumatic valve positioner is one of the main accessories and fittings of the pneumatic regulating valve, which plays a role in valve positioning, and is mainly applied to various industrial automatic process control fields.

[0003] The structure of the pneumatic valve positioner mainly includes I / P plus nozzle baffle, piezoelectric valve and slide valve. Among them, due to the limitation of structure and principle, the CV (English full name: Circulation Volume; Chinese name: flow) coefficient of I / P plus nozzle baffle and piezoelectric valve is usually small. At present, the CV coefficient of the common pneumatic valve positioner on the market is mostly below 0.5. And the CV coefficient of the slide valve type pneumatic valve positioner is mostly below 3 and the gas consumption is large. When a larger flow pneumatic valve positioner is needed, the positioner plus speed-up module can be used to achieve, such as using flow amplifier and fast exhaust valve. But this will increase the number of control elements and fault hidden points, increase energy consumption, and also reduce the control sensitivity due to the series connection of multiple elements. SUMMARY

[0004] The present application provides a large flow valve body for pneumatic valve positioner to solve the problem of low control sensitivity of the existing large flow pneumatic valve positioner.

[0005] The present application provides a large flow valve body for pneumatic valve positioner, comprising a stepper motor, a bus plate and two single valves, the two single valves are mirror image installed with the bus plate as the center; the stepper motor is connected to the rotating shaft of the two single valves at the same time; wherein each single valve comprises a body, an air inlet slide valve and an air outlet slide valve, the body is provided with a first chamber, a second chamber and a third chamber which are connected in communication inside the body, the body is provided with a first balance chamber, a second balance chamber, an air vent and a gas source through hole;

[0006] The first chamber is connected with the gas source through hole; the second chamber is connected with the first balance chamber and the air vent; the third chamber is connected with the second balance chamber;

[0007] The rotating shaft is arranged inside the first chamber, a shaft sleeve is arranged on the rotating shaft, and a flow adjusting slider is arranged at one end of the shaft sleeve; the flow adjusting slider slides in contact with the arc surface of the first chamber, and the flow adjusting slider is located at the gas source through hole;

[0008] The intake slide valve penetrates the first chamber, the second chamber and the first balance chamber, and is fixedly arranged on the shaft sleeve; an intake spring is further arranged on the intake slide valve between the shaft sleeve and the first chamber cavity wall;

[0009] The exhaust slide valve penetrates the first chamber, the second chamber, the third chamber and the second balance chamber, one end of the exhaust slide valve abuts against the shaft sleeve, and the other end is located in the second balance chamber; an exhaust spring is further arranged on the exhaust slide valve in the third chamber.

[0010] Preferably, balance chamber blocks are arranged at the openings of the first balance chamber and the second balance chamber, and the balance chamber blocks are arranged outside the body.

[0011] Preferably, an intake sealing block is further arranged between the intake spring and the first chamber.

[0012] Preferably, an exhaust sealing block is further arranged between the exhaust spring and the third chamber.

[0013] Preferably, balance pistons are arranged at the ends of the intake slide valve and the exhaust slide valve.

[0014] Preferably, the side of the flow regulating slide block in contact with the first chamber is a circular arc surface, and the radius is the same as that of the inner side of the first chamber.

[0015] The technical scheme provided by the embodiment of the present application can have the following beneficial effects:

[0016] The application provides a large-flow valve body for a pneumatic valve positioner, which comprises a stepping motor, a busbar and two single valves, the two single valves are mirror installed with the busbar as the center, the stepping motor is connected with the rotating shafts of the two single valves, wherein each single valve comprises a body, an air inlet slide valve and an air outlet slide valve, the body is internally provided with a first chamber, a second chamber and a third chamber which are connected, the body is provided with a first balance chamber, a second balance chamber, a vent and a gas source through hole, the first chamber is connected with the gas source through hole, the second chamber is connected with the first balance chamber and the vent, the third chamber is connected with the second balance chamber, the rotating shaft is arranged in the first chamber, a shaft sleeve is arranged on the rotating shaft, a flow adjusting slider is arranged at one end of the shaft sleeve, the flow adjusting slider is in contact with the circular surface of the first chamber and slides, and the flow adjusting slider is located at the gas source through hole, the air inlet slide valve penetrates through the first chamber, the second chamber and the first balance chamber, and the air inlet slide valve is fixedly arranged on the shaft sleeve, an air inlet spring is further arranged on the air inlet slide valve between the shaft sleeve and the chamber wall of the first chamber, the air outlet slide valve penetrates through the first chamber, the second chamber, the third chamber and the second balance chamber, one end of the air outlet slide valve abuts against the shaft sleeve, and the other end is located in the second balance chamber, and an air outlet spring is further arranged on the air outlet slide valve in the third chamber. The large-flow valve body has three positions, i.e. A port air inlet and B port air outlet, B port air inlet and A port air outlet and an intermediate position in which A port and B port are sealed and not conductive. In the air inlet and air outlet process, the linear regulation of air inlet flow is realized through the cooperation between the stepping motor, the rotating shaft, the shaft sleeve, the air inlet slide valve, the air outlet slide valve and the flow adjusting slider, the control precision of the controller is improved, and the adjustment difficulty is reduced.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 The layout diagram of the large-flow valve body for the pneumatic valve positioner provided by the embodiment of the application is shown in the figure.

[0020] Figure 2 The structural diagram of the large-flow valve body for the pneumatic valve positioner provided by the embodiment of the application is shown in the figure.

[0021] Figure 3The pneumatic principle diagram of the large flow valve body for the pneumatic valve positioner provided by the embodiment of the present application is provided;

[0022] The symbols are as follows:

[0023] 01-step motor, 02-converging plate, 03-single valve;

[0024] 1-rotating shaft, 2-body, 3-inlet slide valve, 4-exhaust slide valve, 5-first chamber, 6-second chamber, 7-third chamber, 8-first balance chamber, 9-second balance chamber, 10-vent, 11-gas source through hole, 12-shaft sleeve, 13-flow adjusting slider, 14-inlet spring, 15-exhaust spring, 16-balance chamber block, 17-inlet sealing block, 18-exhaust sealing block, 19-balance piston. DETAILED DESCRIPTION

[0025] Please refer to the accompanying drawings Figure 1 、 2 , the accompanying drawings Figure 1 、 2 respectively show the layout diagram and the structure diagram of the large flow valve body for the pneumatic valve positioner provided by the embodiment of the present application. As shown in the accompanying drawings Figure 1 、 2 , the large flow valve body for the pneumatic valve positioner provided by the embodiment of the present application comprises a step motor 01, a converging plate 02 and two single valves 03, the two single valves 03 are installed in mirror image with the converging plate 02 as the center. The step motor 01 is connected to the rotating shafts 1 of the two single valves 03 at the same time, so as to control the two single valves 03 at the same time.

[0026] Specifically, each single valve 03 comprises a body 2, an inlet slide valve 3 and an exhaust slide valve 4. The body 2 is the external structure of the valve body. The inside of the body 2 is provided with a first chamber 5, a second chamber 6 and a third chamber 7 which are connected in series, and the first chamber 5, the second chamber 6 and the third chamber 7 are used for setting other components and exhaust and inlet. The body 2 is provided with a first balance chamber 8, a second balance chamber 9, a vent 10 and a gas source through hole 11, and the first balance chamber 8, the second balance chamber 9, the vent 10 and the gas source through hole 11 are all connected with the outside of the body 2. The first chamber 5 is also connected with the gas source through hole 11, the second chamber 6 is connected with the first balance chamber 8 and the vent 10, and the third chamber 7 is connected with the second balance chamber 9, so as to facilitate the cooperation of various components to realize exhaust and inlet.

[0027] In the first chamber 5, the inside of the first chamber 5 is provided with a rotating shaft 1 which is connected with the step motor 01, so as to drive the rotating shaft 1 to rotate by the step motor 01. The rotating shaft 1 is sleeved with a shaft sleeve 12 outside, and one end of the shaft sleeve 12 is provided with a flow adjusting slider 13, and the other end abuts against the exhaust slide valve 4. When the rotating shaft 1 rotates, the shaft sleeve 12 can rotate with it.

[0028] The flow regulating slider 13 is a component for adjusting the intake airflow. It contacts the inner surface of the first chamber 5 and can slide relative to it. Since the first chamber 5 is connected to the air source through-hole 11, the flow regulating slider 13 is located at the air source through-hole 11 to adjust the intake airflow. During the rotation of the bushing 12, the flow regulating slider 13 is driven to rotate. At this time, the flow regulating slider 13 and the air source through-hole 11 are interleaved, thereby adjusting the size of the air source through-hole 11. That is, the intake cross-sectional area of ​​the air source through-hole 11 is adjusted by rotating the flow regulating slider 13, thereby achieving linear adjustment of the intake airflow, improving the control accuracy of the controller and reducing the adjustment difficulty. Furthermore, the inner surface of the first chamber 5 is a curved surface, and the side of the flow regulating slider 13 that contacts the first chamber 5 is a rounded surface, with the same curvature as the inner surface curvature of the first chamber 5. This curved surface contact design can reduce the movement space of the valve body, making it more compact than a linear slide valve, suitable for valve bodies of various flow rates, especially for large flow valve bodies.

[0029] The intake valve 3 passes through the first chamber 5, the second chamber 6, and the first balance chamber 8, as shown in the attached diagram. Figure 2 The intake slide valve 3 is horizontally positioned as shown. The middle portion of the intake slide valve 3 is fixedly mounted on the bushing 12. Therefore, when the bushing 12 rotates, the intake slide valve 3 can move horizontally. Furthermore, an intake spring 14 is also provided on the intake slide valve 3 between the bushing 12 and the wall of the first chamber 5. This intake spring 14 is used to return the intake slide valve 3 to its initial position, i.e., the portion of the bushing 12 with the flow regulating slider 13 is placed vertically. At this time, the flow regulating slider 13 is located directly above the air source through-hole 11.

[0030] The exhaust valve 4 passes through the first chamber 5, the second chamber 6, the third chamber 7, and the second balance chamber 9, as shown in the attached diagram. Figure 2 The exhaust valve 4 is vertically positioned as shown. One end of the exhaust valve 4 rests against the bushing 12, and the other end is located in the second balance chamber 9. Thus, when the bushing 12 rotates, the exhaust valve 4 can move vertically. Furthermore, an exhaust spring 15 is provided on the exhaust valve 4 in the third chamber 7. This exhaust spring 15 is used to return the exhaust valve 4 to its initial position, i.e., the portion of the bushing 12 where the flow regulating slider 13 is located is vertically positioned, at which point the flow regulating slider 13 is directly above the air source through-hole 11.

[0031] Further, the intake spring 14 and the first chamber 5 are further provided with an intake sealing block 17. During the movement of the intake slide valve 3, the intake spring 14 presses the intake sealing block 17 to make the intake sealing block 17 soft seal with the body 2. Similarly, the exhaust spring 15 and the third chamber 7 are further provided with an exhaust sealing block 18. During the movement of the exhaust slide valve 4, the exhaust spring 15 presses the exhaust sealing block 18 to make the exhaust sealing block 18 soft seal with the body 2. The soft seal between the intake sealing block 17 and the body 2 and the soft seal between the exhaust sealing block 18 and the body 2 have good sealing performance, so that the steady-state air consumption is extremely low.

[0032] The first balance chamber 8 and the second balance chamber 9 are both provided with a balance chamber block 16, and the balance chamber block 16 is arranged outside the body 2. The balance chamber block 16 is used to block the first balance chamber 8 and the second balance chamber 9. The end of the intake slide valve 3 and the exhaust slide valve 4 is provided with a balance piston 19, and the balance piston 19 is located inside the first balance chamber 8 and the second balance chamber 9 respectively. During the operation of the large flow valve body, the balance piston 19 moves inside the first balance chamber 8 and the second balance chamber 9, which can balance the force generated by the pressure difference on both sides of the single valve 03, ensure more strict sealing, and also reduce the required torque of the step motor 01, reduce power consumption, energy saving and environmental protection.

[0033] Please refer to the accompanying drawings Figure 2 , 3 , wherein the accompanying drawings Figure 3 show the pneumatic principle diagram of the large flow valve body for the pneumatic valve positioner provided by the embodiment of the application. In order to distinguish and describe the two single valves 03, the description form of A valve and B valve is adopted in the embodiment of the application. The running process of the large flow valve body for the pneumatic valve positioner provided by the embodiment of the application is as follows: the rotation of the step motor 01 drives the rotation of the shaft sleeve 12, and then drives the rotation of the shaft sleeve 12. When the step motor 01 rotates counterclockwise, the shaft sleeve 12 in the A valve rotates counterclockwise, so that the intake slide valve 3 moves to the right, the intake spring 14 is stretched, and the intake sealing block 17 is driven to move to the right, realizing the intake of the A port. At the same time, the shaft sleeve 12 in the B valve rotates clockwise, so that the exhaust slide valve 4 compresses the exhaust spring 15 to move upward, realizing the exhaust of the B port. Conversely, when the step motor 01 rotates clockwise, the exhaust of the A port and the intake of the B port are realized. When the step motor 01 does not rotate, the flow adjusting slide block 13 blocks the air source through hole 11, the intake sealing block 17 and the exhaust sealing block 18 are sealed with the cavity wall of the body 2, and the A port, the B port and the air source through hole 11 are not connected.

[0034] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0035] It should be understood that any reference to prior art contained herein is not intended to constitute an admission that such prior art is widely known or forms part of the common general knowledge in the field of the invention. It should also be understood that the word "comprising" does not exclude the presence of elements or steps other than those listed and / or the presence of quantified elements or steps. It should also be understood that, unless clearly required to the contrary, the word "comprising" can be replaced by the words "consisting essentially of". The word "comprising" can also be replaced by the word "consisting". It should also be understood that the word "consisting" can be replaced by the word "consisting essentially of". The word "consisting essentially of" can also be replaced by the word "comprising". It should also be understood that the word "substantially" does not exclude the presence of minor elements or steps, e.g. elements or steps not essential to the application. It should also be understood that the word "substantially" can be replaced by the word "completely". It should also be understood that the word "substantially" can be replaced by the word "essentially". It should also be understood that the word "essentially" can be replaced by the word "completely". It should also be understood that the word "completely" does not exclude the presence of minor elements or steps, e.g. elements or steps not essential to the application. It should also be understood that the word "completely" can be replaced by the word "entirely". It should also be understood that the word "entirely" does not exclude the presence of minor elements or steps, e.g. elements or steps not essential to the application. It should also be understood that the word "entirely" can be replaced by the word "totally". It should also be understood that the word "totally" does not exclude the presence of minor elements or steps, e.g. elements or steps not essential to the application. It should also be understood that the word "totally" can be

Claims

1. A high-flow-rate valve body for a pneumatic valve positioner, characterized in that, It includes a stepper motor (01), a manifold (02), and two single valves (03), with the two single valves (03) mounted in a mirror image with the manifold (02) as the center; the stepper motor (01) is connected to the rotating shaft (1) of the two single valves (03); each single valve (03) includes a body (2), an intake slide valve (3), and an exhaust slide valve (4); the body (2) is provided with a first chamber (5), a second chamber (6), and a third chamber (7) that are connected to each other; the body (2) is provided with a first balance chamber (8), a second balance chamber (9), an air vent (10), and an air source through hole (11); The first chamber (5) is connected to the air source through hole (11); the second chamber (6) is connected to the first balance chamber (8) and the air vent (10); the third chamber (7) is connected to the second balance chamber (9); The first chamber (5) is provided with the rotating shaft (1), the rotating shaft (1) is provided with the bushing (12), and the bushing (12) is provided with the flow regulating slider (13) at one end; the flow regulating slider (13) slides in contact with the arc surface of the first chamber (5), and the flow regulating slider (13) is located at the air source through hole (11); The intake slide valve (3) passes through the first chamber (5), the second chamber (6) and the first balance chamber (8), and the intake slide valve (3) is fixedly mounted on the bushing (12); an intake spring (14) is also provided on the intake slide valve (3) between the bushing (12) and the wall of the first chamber (5); The exhaust slide valve (4) passes through the first chamber (5), the second chamber (6), the third chamber (7) and the second balance chamber (9). One end of the exhaust slide valve (4) abuts against the bushing (12), and the other end is located in the second balance chamber (9). An exhaust spring (15) is also provided on the exhaust slide valve (4) in the third chamber (7).

2. The high-flow-rate valve body for a pneumatic valve positioner according to claim 1, characterized in that, The openings of the first balance chamber (8) and the second balance chamber (9) are provided with balance chamber blocks (16), and the balance chamber blocks (16) are located outside the body (2).

3. The high-flow-rate valve body for a pneumatic valve positioner according to claim 1, characterized in that, An air intake sealing block (17) is also provided between the air intake spring (14) and the first chamber (5).

4. The high-flow-rate valve body for a pneumatic valve positioner according to claim 1, characterized in that, An exhaust sealing block (18) is also provided between the exhaust spring (15) and the third chamber (7).

5. The high-flow-rate valve body for a pneumatic valve positioner according to claim 1, characterized in that, The intake slide valve (3) and the exhaust slide valve (4) are both provided with balance pistons (19) at their ends.

6. The high-flow-rate valve body for a pneumatic valve positioner according to claim 1, characterized in that, The side of the flow regulating slider (13) that contacts the first chamber (5) is an arc surface, and the arc is the same as the arc of the inner side of the first chamber (5).

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