CN116753347A

CN116753347A - Electrical conversion device

Info

Publication number: CN116753347A
Application number: CN202310669955.5A
Authority: CN
Inventors: 蒋启斌; 张健; 张云福
Original assignee: Chongqing Chuanyi Control Valve Co Ltd
Current assignee: Chongqing Chuanyi Control Valve Co Ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-09-15

Abstract

The application provides an electrical conversion device, which comprises a machine body, wherein an air source cavity, an output cavity, an exhaust cavity, an air injection cavity and an input mechanism are sequentially arranged in the machine body along the same direction; the machine body is provided with an air inlet corresponding to the air source cavity, an output port corresponding to the output cavity, an air outlet corresponding to the air exhaust cavity and a back pressure channel; a fixed seat for separating the chambers is arranged between the air source chamber and the output chamber, an air inlet channel is arranged on the fixed seat, a movable rod is arranged through the air inlet channel, a blocking part is arranged on the movable rod, and an elastic part is arranged on the movable rod; a first pneumatic component is arranged between the output cavity and the exhaust cavity, an exhaust piece is arranged on the first pneumatic component, an exhaust channel is arranged on the exhaust piece, and one end of the movable rod positioned in the exhaust cavity extends into the exhaust channel and can seal the exhaust channel; a second pneumatic component is arranged between the exhaust cavity and the air injection cavity, and one end of the exhaust component, which is far away from the first pneumatic component, is abutted against the second pneumatic component; an air nozzle is arranged between the air spraying cavity and the input mechanism.

Description

Electrical conversion device

Technical Field

The application belongs to the field of signal conversion, and particularly relates to an electrical conversion device.

Background

The intelligent valve positioner is an important control accessory of the regulating valve device, is usually matched with a film type pneumatic actuator for use, and controls the action of the regulating valve by controlling the pressure of a cavity of the film type pneumatic actuator. The intelligent valve positioner is connected with an input voltage signal of the controller, then converts an electric signal into a pressure signal through an internal electric converter, then amplifies the pressure signal through a signal amplifying mechanism, and outputs a signal with larger flow and larger pressure to control the pneumatic actuator, so that the action of the regulating valve is controlled.

The existing intelligent valve positioner has the advantages that the electric conversion mechanism realizes the conversion process from an electric signal to an air signal according to the electromagnetic principle, the electromagnetic coil generates electromagnetic force to attract the metal sheet to deform the metal sheet, and the air injection gap is changed, so that the exhaust resistance of an exhaust channel is changed, and the change of output air pressure is realized. However, when the metal sheet is subjected to severe vibration, unstable vibration is generated by the metal sheet, and the stability and accuracy of the back pressure signal are affected.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, an object of the present application is to provide an electrical conversion device to solve the above-described problems.

In order to achieve the above and other related objects, the present application provides an electrical conversion device, including a machine body, in which an air source cavity, an output cavity, an exhaust cavity, an air injection cavity and an input mechanism are sequentially disposed along the same direction; the machine body is provided with an air inlet for air inlet of the air source cavity, an output port for output of the output cavity, an exhaust port for exhaust of the exhaust cavity and a back pressure channel for communication between the air source cavity and the air injection cavity;

a fixed seat for separating the chambers is arranged between the air source chamber and the output chamber, an air inlet channel is formed in the fixed seat, a movable rod penetrates through the air inlet channel, a blocking part for blocking the air inlet channel is arranged at one end of the movable rod, which is positioned in the air source chamber, and an elastic component for providing elastic force for the movable rod to move towards the output chamber is arranged between the inner wall of the air source chamber and the movable rod;

a first pneumatic component for separating the chambers is arranged between the output chamber and the exhaust chamber, an exhaust piece is arranged on the first pneumatic component, an exhaust channel for communicating the output chamber with the exhaust chamber is arranged on the exhaust piece, and one end of the movable rod positioned in the exhaust chamber extends into the exhaust channel and can block the exhaust channel;

a second pneumatic component with separated chambers is arranged between the exhaust cavity and the air injection cavity, and one end of the exhaust piece, which is far away from the first pneumatic component, is abutted against the second pneumatic component; an air nozzle is arranged between the air spraying cavity and the input mechanism.

Optionally, the air source intracavity wall epirelief is equipped with and is used for limiting the first spacing portion of fixing base mounted position, the air inlet with back pressure channel's opening is seted up between first spacing portion with elastomeric element.

Optionally, a second limiting part is arranged on the fixing seat, the second limiting part is used for limiting the distance between the fixing seat and the first limiting part, a communication hole is formed in the second limiting part, and the communication hole is communicated with the output port.

Optionally, a throttling element for adjusting the size of the communication section between the back pressure channel and the air injection cavity is arranged on the machine body.

Optionally, the exhaust piece includes first connecting portion and second connecting portion, first connecting portion with the second connecting portion is fixed perpendicularly, the second connecting portion is located the exhaust intracavity, just the second connecting portion with the second pneumatic component is supported against, first connecting portion pass behind the first pneumatic component be used for with the movable rod is supported against.

Optionally, the exhaust channel is opened along the axial direction of the first connecting portion, the first connecting portion is located the position in the exhaust cavity is opened the gas outlet of exhaust channel, the gas outlet is evenly opened around the first connecting portion.

Optionally, the input mechanism includes a linear motor, the output end of the linear motor is connected with a movable block, and the movable block is driven by the linear motor to be close to or far away from the air nozzle, so that an air injection gap between the air nozzle and the movable block is changed.

Optionally, a sealing ring is arranged between the fixing seat and the inner wall of the machine body.

Optionally, the first pneumatic component is a first diaphragm, and the vent is mounted on the first diaphragm; the first pneumatic component is a second diaphragm.

Optionally, the elastic component is a spring.

As described above, the electrical conversion device of the present application has the following advantageous effects:

in the scheme, air is taken in from the air inlet, and after the air enters the air source cavity, the movable rod abuts against the fixed seat under the double functions of the elastic component and the air pressure, so that the air inlet channel is closed. Part of gas in the gas source cavity enters the gas spraying cavity through the back pressure channel, part of gas in the gas spraying cavity is sprayed out through the gas nozzle, and exhaust resistance is formed under the blocking of the output of the input mechanism, so that back pressure P1 is formed in the gas spraying cavity.

The back pressure P1 in the spraying cavity acts on the second pneumatic component to form a thrust F1, the exhaust piece is pushed to move towards the air source cavity, at the moment, the exhaust piece drives the movable rod to move towards the air source cavity, the exhaust channel is closed, and the ventilation channel is opened.

The gas in the gas source cavity enters the output cavity from the gas inlet channel to form a pressure signal P2, and the pressure signal P2 acts on the first pneumatic component to form thrust F2. As the gas in the output chamber increases, the pressure signal P2 increases, so that the thrust force F2 increases. When the thrust force f2=f1, the exhaust member and the movable rod return to the initial positions, thereby closing the intake passage and the exhaust passage, and at this time, the pressure signal P2 in the output chamber is output from the output port, forming an output pressure signal. At this time, p2=mp1, where m is a proportionality coefficient.

When the back pressure P1 in the spray cavity is reduced and the thrust F2 is greater than the thrust F1, the exhaust piece is moved towards the spray cavity, so that the exhaust channel is opened. At this time, the gas in the output chamber is discharged to the exhaust chamber through the exhaust passage and is discharged through the exhaust port, and the pressure P2 in the output chamber is lowered. When the pressure P2 decreases such that f2=f1, the exhaust member and the movable lever return to the initial positions again, closing the intake passage and the exhaust passage, and at this time the output port outputs the pressure p2=mp1.

The principle of electrical conversion in the application is different from the prior art, and electromagnetic coils, metal sheets and the like are not arranged in the application, so that instability caused by vibration of the metal sheets is avoided, and the stability of signals is effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of an electrical conversion device according to an embodiment of the application.

Fig. 2 is an enlarged view at A-A in fig. 1.

FIG. 3 is a schematic view of the cooperation between the movable rod and the air discharge member in an embodiment of the present application.

Detailed Description

Reference numerals in the drawings of the specification include: base 1, exhaust seat 2, jet seat 3, air nozzle 301, linear motor 4, movable block 401, air inlet 5, output port 6, exhaust port 7, air source chamber 8, output chamber 9, exhaust chamber 10, jet chamber 11, jet gap 12, fixing seat 13, air intake channel 1301, second stopper 1302, communication hole 1303, first stopper 1304, first diaphragm 14, second diaphragm 15, spring 16, movable rod 17, blocking portion 1701, exhaust member 18, exhaust channel 1801, first connection 1802, second connection 1803, air outlet 1804, throttle 19, and back pressure channel 20.

Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, which is described by the following specific examples.

The pneumatic conversion device in the application is shown with reference to fig. 1 to 3.

In an exemplary embodiment of the present application, an electrical conversion device is provided, including a machine body, in which an air source chamber 8, an output chamber 9, an exhaust chamber 10, an air injection chamber 11 and an input mechanism are sequentially disposed along the same direction; the machine body is provided with an air inlet 5 for air inlet of the air source cavity 8, an output port 6 for output of the output cavity 9, an air outlet 7 for exhaust of the exhaust cavity 10 and a back pressure channel 20 for communication between the air source cavity 8 and the air injection cavity 11;

a fixed seat 13 for separating the chambers is arranged between the air source chamber 8 and the output chamber 9, an air inlet channel 1301 is formed in the fixed seat 13, a movable rod 17 is arranged through the air inlet channel 1301, a blocking part 1701 for blocking the air inlet channel 1301 is arranged at one end of the movable rod 17 positioned in the air source chamber 8, and an elastic part for providing elastic force for the movable rod 17 to move towards the output chamber 9 is arranged between the inner wall of the air source chamber 8 and the movable rod 17;

a first pneumatic component for separating the chambers is arranged between the output chamber 9 and the exhaust chamber 10, an exhaust piece 18 is arranged on the first pneumatic component, an exhaust channel 1801 for communicating the output chamber 9 with the exhaust chamber 10 is arranged on the exhaust piece 18, and one end of the movable rod 17 positioned in the exhaust chamber 10 stretches into the exhaust channel 1801 and can seal the exhaust channel 1801;

a second pneumatic component with separated chambers is arranged between the exhaust cavity 10 and the air injection cavity 11, and one end of the exhaust piece 18, which is far away from the first pneumatic component, is abutted against the second pneumatic component; an air nozzle 301 fixing seat is arranged between the air-spraying cavity 11 and the input mechanism.

In this embodiment, after air is introduced from the air inlet 5 and enters the air source chamber 8, the movable rod 17 abuts against the fixed seat 13 under the dual actions of the elastic component and the air pressure, so that the air inlet channel 1301 is closed. Part of the gas in the gas source cavity 8 enters the gas injection cavity 11 through the back pressure channel 20, part of the gas in the gas injection cavity 11 is injected through the gas nozzle 301, and exhaust resistance is formed under the blocking of the input mechanism, so that back pressure P1 is formed in the gas injection cavity 11.

The back pressure P1 in the air spraying cavity 11 acts on the second pneumatic component to form a thrust force F1, so that the air exhausting member 18 is pushed to move towards the air source cavity 8, and at the moment, the air exhausting member 18 drives the movable rod 17 to move towards the air source cavity 8, the air exhausting channel 1801 is closed, and the ventilation channel is opened.

The gas in the gas source chamber 8 enters the output chamber 9 from the gas inlet channel 1301 to form a pressure signal P2, and the pressure signal P2 acts on the first pneumatic component to form a thrust force F2. As the gas in the output chamber 9 increases, the pressure signal P2 increases, so that the thrust force F2 increases. When the pushing force f2=f1, the exhaust member 18 and the movable rod 17 return to the initial positions, thereby closing the intake passage 1301 and the exhaust passage 1801, and at this time, the pressure signal P2 in the output chamber 9 is output from the output port 6, forming an output pressure signal. At this time, p2=mp1, where m is a proportionality coefficient.

When the back pressure P1 in the spray chamber 11 decreases and the thrust force F2 is greater than the thrust force F1, the exhaust member 18 is moved toward the spray chamber 11, thereby opening the exhaust passage 1801. At this time, the gas in the output chamber 9 is discharged to the exhaust chamber 10 through the exhaust passage 1801 and is discharged from the exhaust port 7, and the pressure P2 in the output chamber 9 is lowered. When the pressure P2 decreases such that f2=f1, the exhaust member 18 and the movable lever 17 return to the initial positions again, closing the intake passage 1301 and the exhaust passage 1801, and the output port 6 outputs the pressure p2=mp1.

In an exemplary embodiment, a first limiting portion 1304 for limiting the installation position of the fixing seat 13 is convexly arranged on the inner wall of the air source cavity 8, and openings of the air inlet 5 and the back pressure channel 20 are formed between the first limiting portion 1304 and the elastic component.

In this embodiment, the first limiting portion 1304 is provided to avoid blocking the openings of the air inlet 5 and the air outlet 1801 after the fixing base 13 is installed.

In an exemplary embodiment, the fixing base 13 is provided with a second limiting portion 1302, the second limiting portion 1302 is used for limiting a distance between the fixing base 13 and the first limiting portion 1304, the second limiting portion 1302 is provided with a communication hole 1303, and the communication hole 1303 is communicated with the output port 6.

Illustratively, the inlet air passageway 1301 is flared in diameter from the air supply chamber 8 to the outlet chamber 9.

Illustratively, the second limiting portion 1302 is configured such that, when the fixing base 13 moves to a predetermined position, the communication hole 1303 coincides with the output port 6, so as to open the output port 6.

In an exemplary embodiment, a throttle 19 is provided on the body for adjusting the size of the communication cross section between the back pressure channel 20 and the air injection chamber 11.

By providing the throttle 19, the size of the communication section between the back pressure passage 20 and the air injection chamber 11 can be changed, and when the throttle 19 is inserted deeper, the communication section between the back pressure passage 20 and the air injection chamber 11 is smaller, whereas the communication section (or communication gap) between the back pressure passage 20 and the air injection chamber 11 is larger. By changing the communication section, the variation characteristic of the back pressure along with the air injection gap in the air injection cavity 11 is further changed, so that the back pressure is linearly changed, exponentially changed or the like in percentage along with the variation of the air injection gap.

Illustratively, the communication section between the back pressure channel 20 and the air injection cavity 11 is a bell mouth, one end of the throttling element 19 is in threaded connection with the machine body, the other end of the throttling element 19 is a blocking end extending into the bell mouth, and a communication gap is formed between the blocking end and the inner wall of the bell mouth.

In an exemplary embodiment, the exhaust 18 includes a first connection 1802 and a second connection 1803, the first connection 1802 and the second connection 1803 being vertically fixed, the second connection 1803 being located within the exhaust chamber 10, and the second connection 1803 being in abutment with a second pneumatic component, the first connection 1802 being configured to abut the movable rod 17 after passing through the first pneumatic component.

In this embodiment, the second connection 1803 is provided so as to increase the contact area between the exhaust member 18 and the second pneumatic component, reducing the likelihood of damage to the second pneumatic component.

In an exemplary embodiment, the exhaust channel 1801 is opened along the axial direction of the first connection portion 1802, the portion of the first connection portion 1802 located in the exhaust chamber 10 is opened with the air outlet 1804 of the exhaust channel 1801, and the air outlet 1804 is uniformly opened around the first connection portion 1802.

In this embodiment, the air outlets 1804 are uniformly opened to achieve uniform air discharge in all directions in the air discharge chamber 10.

In an exemplary embodiment, the input mechanism includes a linear motor 4, and a movable block 401 is connected to an output end of the linear motor 4, and the movable block 401 is driven by the linear motor to approach or separate from the air nozzle 301, so that an air injection gap 12 between the air nozzle 301 and the movable block 401 is changed.

In this embodiment, the electrical conversion device is connected to the signal, the linear motor 4 generates displacement correspondingly, and when the input signal is changed, the linear motor 4 acts, so as to change the air injection gap 12 between the air nozzle 301 and the movable block 401. As the jet gap 12 changes, the back pressure P1 in the back pressure chamber changes, and the output pressure P2 in the output chamber 9 changes.

In an exemplary embodiment, a sealing ring is provided between the fixing base 13 and the inner wall of the machine body.

In this embodiment, a seal ring is provided to achieve sealing.

In an exemplary embodiment, the first pneumatic component is a first diaphragm 14 and the vent 18 is mounted on the first diaphragm 14; the first pneumatic component is a second diaphragm 15.

The body includes a base 1, an exhaust seat 2, an air injection seat 3, and an input seat connected in this order along the same direction. The air source cavity 8 and the output cavity 9 are arranged in the base 1, the first diaphragm 14 is arranged between the base 1 and the exhaust seat 2, the second diaphragm 15 is arranged between the exhaust seat 2 and the jet seat 3, the back pressure channel 20 sequentially penetrates through the base 1, the first diaphragm 14, the exhaust seat 2 and the second diaphragm 15, and the input mechanism is arranged on the input seat.

Illustratively, the exhaust seat 2 is provided with a third limiting portion for cooperating with the second limiting portion 1302 to abut against and limit.

In an exemplary embodiment, the resilient member is a spring 16.

Illustratively, the inner wall of the base 1 is provided with a mounting groove for the spring 16, so as to facilitate mounting of the spring 16.

It should be noted that, the pressure signal output by the existing electrical converter cannot directly drive the actuator to act, and the actuator can be driven only after the pressure signal is amplified separately. In the scheme, through the arrangement of the throttling element and the like, the electric signal can be directly converted into an amplified pressure signal, and the actuator can be directly driven to act.

The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The electric conversion device is characterized by comprising a machine body, wherein an air source cavity, an output cavity, an exhaust cavity, an air injection cavity and an input mechanism are sequentially arranged in the machine body along the same direction; the machine body is provided with an air inlet for air inlet of the air source cavity, an output port for output of the output cavity, an exhaust port for exhaust of the exhaust cavity and a back pressure channel for communication between the air source cavity and the air injection cavity;

2. The electrical conversion device according to claim 1, wherein a first limiting portion for limiting the mounting position of the fixing base is provided on the inner wall of the air source chamber in a protruding manner, and openings of the air inlet and the back pressure channel are provided between the first limiting portion and the elastic member.

3. The electrical conversion device according to claim 2, wherein a second limiting portion is provided on the fixing base, the second limiting portion is used for limiting a distance between the fixing base and the first limiting portion, and a communication hole is provided on the second limiting portion, and the communication hole is communicated with the output port.

4. The electrical conversion device according to claim 1, wherein a throttle member for adjusting the size of a communication section between the back pressure passage and the air injection chamber is provided on the body.

5. The electrical conversion device according to claim 1, wherein the exhaust member includes a first connection portion and a second connection portion, the first connection portion and the second connection portion are vertically fixed, the second connection portion is located in the exhaust chamber, the second connection portion abuts against the second pneumatic member, and the first connection portion passes through the first pneumatic member and then abuts against the movable rod.

6. The electrical switching apparatus as set forth in claim 5 wherein said vent passage is open along an axial direction of said first connecting portion, an air outlet of the vent passage is open at a location of said first connecting portion within said vent chamber, said air outlet being open uniformly around said first connecting portion.

7. The electrical conversion device according to claim 1, wherein the input mechanism comprises a linear motor, and an output end of the linear motor is connected with a movable block, and the movable block is driven by the linear motor to be close to or far away from the air nozzle, so that an air injection gap between the air nozzle and the movable block is changed.

8. The electrical conversion device according to claim 1, wherein a sealing ring is provided between the fixing base and the inner wall of the body.

9. The electrical conversion apparatus according to claim 1, wherein the first pneumatic component is a first diaphragm, the vent being mounted on the first diaphragm; the first pneumatic component is a second diaphragm.

10. The electrical conversion device according to claim 1, wherein the elastic member is a spring.