KR101544192B1 - control system for pneumatic control vavle of temperature control - Google Patents
control system for pneumatic control vavle of temperature control Download PDFInfo
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- KR101544192B1 KR101544192B1 KR1020140029489A KR20140029489A KR101544192B1 KR 101544192 B1 KR101544192 B1 KR 101544192B1 KR 1020140029489 A KR1020140029489 A KR 1020140029489A KR 20140029489 A KR20140029489 A KR 20140029489A KR 101544192 B1 KR101544192 B1 KR 101544192B1
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Abstract
Description
The present invention relates to an air pressure control valve for temperature control, and more particularly, to an air pressure control valve for controlling the displacement of a valve rod by controlling an air pressure applied to a diaphragm of an air pressure control valve and adjusting the amount of fluid flowing through the control valve And a control system of an air pressure control valve for temperature control for controlling a temperature of a rear end temperature sensing part such as an engine or a mixed liquid to a set reference temperature.
Generally, the air pressure control valve controls the temperature by controlling the amount of fluid flowing in the air pressure control valve by using the air pressure to be applied. The air pressure control valve is applied to shipyard, onshore plant piping line, and the like.
However, such a conventional air pressure control valve uses a valve to adjust the air pressure, or a mechanical integral control device or the like, which can not easily and easily adjust the air pressure in the air pressure control valve, The performance of the pneumatic control valve is deteriorated due to the inability to control the amount of the fluid flowing through the pneumatic control valve, and thus the temperature of the pneumatic control valve can not be accurately controlled.
The present invention has been proposed in order to solve the above-described problems in the prior art, and it is an object of the present invention to provide a control system for an air pressure control valve for temperature control, And controls the displacement of the valve rod by controlling the applied air pressure to control the amount of fluid flowing through the control valve so that the temperature of the rear end temperature sensing part such as the engine or the mixed liquid can be easily and easily controlled to the set reference temperature.
According to an aspect of the present invention, there is provided a temperature control apparatus including: a reference temperature input mechanism for inputting an existing temperature; An error generation link mechanism unit for converting the error between the reference temperature and the current temperature, which are connected to the reference temperature input mechanism unit, into a flapper displacement; A nozzle-flapper one-stage amplifier unit connected to the error generation link mechanism unit to generate a change in nozzle back pressure according to a change in flapper displacement generated in the error generation link mechanism unit; And a small amount of the supply air is supplied to the nozzle of the nozzle-flapper one-stage amplifier bite through the orifice installed inside and connected to the nozzle-flapper one-stage amplifier bite, A pneumatic relay two-stage amplifier for generating a control pressure to be applied to the pneumatic control valve by controlling the displacement of the inner valve stem by taking the back pressure as the working pressure of the upper diaphragm and controlling the cross- An air pressure control valve connected to the pneumatic relay two-stage amplifier section to receive a control pressure output from the pneumatic relay two-stage amplifier section under the action pressure of the diaphragm provided at the upper portion, and to control the displacement of the valve stem to control the flow rate of the emulsion; A temperature variable rear end temperature sensing unit connected to the air pressure control valve and having a temperature variable when the flow rate of the fluid is controlled by the air pressure control valve; A bourdon tube temperature measuring mechanism part connected to the temperature variable rear end temperature sensing part and mechanically measuring the temperature of the changed temperature rear end temperature sensing part and converting the temperature into angular displacement of the bourdon tube; A link mechanism connected to the bourdon tube temperature measuring mechanism for converting an angular displacement of the bourdon tube to an output temperature on a linear scale and generating a flapper displacement to reduce an error with a reference temperature generated on a linear scale An output temperature indicator mechanism coupled to the reference temperature input mechanism via a link; The proportional-differential operation unit is connected to the air-pressure relay two-stage amplifier bender and controls the response speed at which the nozzle back pressure is changed by adjusting the temperature change interval proportional to the flapper operation displacement using the proportional band adjuster. Wherein the proportional-integral operation unit increases the relative stability of the control operation by generating a negative feedback flapper displacement in a direction opposite to the flapper error displacement generated by the simple feedback of the temperature error, and the proportional- And a proportional-integral-differential operation mechanism for generating a displacement to increase a response speed and to eliminate a steady-state error. The control system for an air-pressure control valve for temperature control is provided.
According to the present invention as described above, there are provided a reference temperature input mechanism, an error generation link unit, a nozzle-flapper first stage amplifier, an air pressure relay second stage amplifier, a proportional-integral-differential operation mechanism, And a control system of an air pressure control valve for temperature control composed of a variable rear end warming part, a bourdon tube temperature measuring mechanism part, and an output temperature instruction part, the control system of the air pressure control valve controls the air pressure To control the displacement of the valve rod to control the amount of the fluid flowing through the control valve, thereby easily and easily controlling the temperature of the rear end temperature sensing part such as the engine or the mixed liquid to the set reference temperature.
1 is a configuration diagram of a control system of an air pressure control valve for temperature control of the present invention.
2 is a configuration diagram showing a nozzle-flapper one-stage amplifier bend of a control system of an air pressure control valve for temperature control of the present invention.
FIGS. 3 and 4 are views showing a state in which a displacement of an error generating link is varied according to a rotation angle of a proportional band dial of a nozzle-flapper single-stage amplifier of the present invention. FIG.
The present invention relates to a control system for an air pressure control valve for controlling the temperature of an air conditioner, and more particularly,
6 is a configuration view showing a pneumatic relay two-stage amplifier bend of a control system of an air pressure control valve for temperature control of the present invention.
FIG. 7 and FIG. 8 are operating states showing the respective configurations of the Bourdon tube temperature measuring mechanism of the control system of the air pressure control valve for temperature control of the present invention and the temperature measurement by the rotation angle of the Bourdon tube.
FIG. 9 and FIG. 10 are operating states showing the operating state of the error generating link mechanism portion of the control system of the air pressure control valve for temperature control of the present invention. FIG.
11 is a graph showing a relationship between a flapper displacement and an error occurrence link displacement and a nozzle back pressure in a control system of an air pressure control valve for temperature control according to the present invention.
12 is a configuration view showing a proportional-integral-differential action mechanism of the control system of the air pressure control valve for temperature control of the present invention.
13 is a block diagram showing a proportional-integral operation unit of the proportional-integral-differential action mechanism of the present invention.
FIG. 14 is a block diagram showing the structure of the integral gain control unit and the differential gain control unit of the proportional-integral-differential action mechanism according to the present invention. FIG.
Hereinafter, a control system for an air pressure control valve for temperature control according to the present invention will be described in more detail with reference to FIGS. 1 to 14.
The present invention controls the displacement of the valve rod by controlling the air pressure applied to the diaphragm of the air pressure control valve and regulates the amount of fluid flowing through the control valve so that the temperature of the rear end temperature sensing part such as engine or mixed liquid is controlled A control system for an air pressure control valve for temperature control is provided.
As shown in FIG. 1, the control system for the air pressure control valve for temperature control includes a link mechanism having a function of indicating on a scale indicating an existing temperature to be set, And a reference temperature
The reference temperature
The error generating
In the nozzle-flapper single-
The control pressure output from the pneumatic relay two-
The air
The Bourdon tube temperature measuring instrument (60) is a sensor for measuring the temperature of the changed variable temperature rear end temperature sensing part (60) mechanically and converting it into an angular displacement of the Bourdon tube (703) (70) are connected.
The bourdon tube
The air pressure relay two-
The proportional-integral-differential
As shown in FIG. 2, the nozzle-flapper single-
The nozzle-flapper single
2, the error displacement generated by the error generation
The sensitivity that the nozzle back pressure varies according to the flapper displacement is controlled by the diameter of the
As shown in FIGS. 5 and 6, the air pressure relay two-
An
A
A variable opening
The relay
5 and 6, air supplied from the outside passes through the
In a normal state, the nozzle back pressure changed by the nozzle-flapper first-
The generated displacement of the
As a result, the relay control pressure output from the air pressure relay two-
As shown in FIGS. 7 and 8, the bourondon tube
The other end of the capillary 702 on the side of the capillary 702 is fixed by a fixing
The first
An
As shown in FIGS. 5 and 6, the bourdon tube
At this time, when a temperature change occurs in the temperature-variable rear end
The other end of the
The generated rotation angle is transmitted to the
That is, as shown in FIG. 8, in the intermediate temperature guide of the temperature measurement span, the
Thus, by causing the displacement of the
9 and 10, the error generating
In order to obtain a large displacement of the error generating link with respect to the same temperature error, the indicated
9 and 10, the error-generating
On the other hand, the reference temperature is indicated on the
As shown in FIG. 9, the shape of the error generating
As shown in FIG. 10, the reference temperature indicating instruction is set to a high temperature and has a positive temperature error. The instruction
In order to obtain a large displacement of the
11 is a graph showing the relationship between the flapper displacement and the error occurrence link displacement and the nozzle back pressure in the control system of the air pressure control valve for temperature control according to the present invention. The output of the air pressure relay two- The pressure is changed in accordance with the displacement of the
When the displacement of the
On the other hand, the displacement of the
As shown in FIG. 2, whenever the displacement of the
2 shows the case where the rotational angle of the variable
Assuming that the variable
12 to 14, the proportional-integral-
14, the integral
The differential
In order to eliminate the temperature error in the steady state in the proportional-integral-
In order to eliminate such a steady-state error, a proportional-integral controller, which is a
In the proportional-integral controller, when the reference temperature is higher than the current temperature and there is a positive steady state error, an integral operation is performed to eliminate the positive steady state error. Referring to FIG. 13, a temperature error having a positive sign is generated However, when it is assumed that the steady state error is expressed by no occurrence of the displacement of the
When the opening degree of the
If the steady-state error remains unremoved, the integral control operation is performed until the nozzle back pressure and the resulting control pressure become maximum. At this time, the opening of the air
Thus, by using the proportional-integral controller to continuously integrate the control pressure into the positive feedback bellows 93, the displacement of the feedback link must be varied in the direction of eliminating the steady-state error. In the proportional-integral controller, when the integral gain is increased by increasing the opening degree of the integral controller, the pressure within the positive feedback bellows 93 is rapidly reached due to the short integration time. At this time, The rise time at which the current temperature reaches the reference temperature is very short and chattering is caused by repeatedly generating large overshoot and undershoot around the reference temperature. On the other hand, if the opening degree of the integrating regulator is made small in order to prevent overshoot and frequent chattering, the integral time required for the pressure inside the positive feedback bellows 93 to reach the control pressure becomes longer, The longer the rise time it takes. In this case, the proportional-integral controller is not suitable for a controller for an air-pressure control system that allows the temperature of the temperature-variable rear end
Therefore, the proportional-integral-differential
As shown in FIGS. 12 and 14, the proportional-integral-
Here, since the feedback control pressure is passed through the integral
The operation of the proportional-integral-
A part of the control pressure that has passed through the integral
The nozzle back pressure and the control pressure corresponding to the displacements of the
It should be noted that when the differential control gain is set too high, the integral control operation is excessively limited so that overshoot does not occur but the over-damped state occurs when the steady state, that is, the time at which the current temperature reaches the reference temperature becomes too long, The differential gain can be adjusted by paying due attention to the fact that the operation of the air pressure control system having the characteristics of the proportional-integral-
14, the control pressure, which is the output of the pneumatic-relay two-
When air pressure is input into the differential
Therefore, it is possible to prevent an excessive amount of feedback displacement from occurring by summing up the feedback link displacement and the negative feedback link displacement that are generated, as well as prevent the current temperature of the temperature variable
Although the control system of the pneumatic control valve for temperature control according to the present invention has been described with reference to the drawings, the present invention is not limited to the embodiments and drawings described in the present specification, Various modifications may be made by those skilled in the art, so that they should not be individually understood from the technical idea or viewpoint of the present invention.
10: reference temperature input mechanism section 20: error generation link section
30: nozzle-flapper one-stage amplifier bend 40: air pressure relay two-stage amplifier bend
50: air pressure control valve 60: temperature variable rear end touching part
70: Bourdon tube temperature measuring mechanism 80: Output temperature indicator
90: Proportional-integral-differential operation mechanism section 91: Proportional-integral operation section
92: integral gain control unit 93: positive feedback bellows for integration control
94: proportional-differential operation unit 95: differential gain control unit
96: feedback control signal for differential control bellows 97: communicating tube
201: Instructions Rotating Pivot 202: Instruction Temperature Rotating Link
203: error generation link 204: reference temperature instruction dial
301: nozzle fixing body 302: nozzle part
303: nozzle 304: air supply port
305: auxiliary link for generating flapper displacement 306: flapper
307: O-ring 308: Variable proportional band dial
309: Auxiliary lever 401: Relay upper body
401a: Pressure space 402: Relay lower body
403: Relay central body 404: Orifice
405, 406: upper and
409: elastic spring 410: relay valve rod supporting spring
411: Variable opening
412: Relay valve rod 701: Liquid link
702: capillary tube 703: Bourdon tube
704: Fixing
706: delivery link 708: indicator bed
709: Temperature instrument panel 921: Integral gain body
922: Integral gain control dial 923: Integral gain shift member
924: Integral gain adjustment member 925: Integral gain inflow ball
926: Integral gain control ball 927: Integral gain ejection ball
928: Output air discharge hole 951: Differential gain body
952: differential gain control dial 953: differential gain shifting member
954: differential gain control member 955: differential gain inlet ball
956: differential gain control ball 957: differential gain ejection ball
Claims (8)
An error generation link mechanism unit for converting the error between the reference temperature and the current temperature, which are connected to the reference temperature input mechanism unit, into a flapper displacement;
A nozzle-flapper one-stage amplifier unit connected to the error generation link mechanism unit to generate a change in nozzle back pressure according to a change in flapper displacement generated in the error generation link mechanism unit;
A small amount of air supplied from the outside through an orifice provided inside is passed through a pressure space inside the upper body and then connected to an air supply port of the nozzle-flapper one-stage amplifier bulb by a tube or a hose, The nozzle back pressure regulated by the nozzle-flapper one-stage amplifier bend acts on the normal state with the pressure in the pressure space inside the upper body connected by the tube or hose, as well as supplying the supply air to the nozzle of the amplifier bend. And the pressure of the upper diaphragm forming one side of the pressure space is converted into the force of moving the valve rod to control the displacement of the inner valve rod so that the cross sectional area of the passage through which a large amount of supply air passes is controlled, An air-pressure relay two-stage amplifying unit for generating a control pressure to be applied to the air pressure relay;
The control pressure output from the air pressure relay two-stage amplifier is connected to the air pressure relay two-stage amplifier and controlled by the diaphragm installed on the upper portion of the control valve through a tube or a hose to control the displacement of the control valve inner rod An air pressure control valve for controlling the flow rate of the fluid;
A temperature variable rear end temperature sensing unit connected to the air pressure control valve and having a temperature variable when the flow rate of the fluid is controlled by the air pressure control valve;
A bourdon tube temperature measuring mechanism part connected to the temperature variable rear end temperature sensing part and mechanically measuring the temperature of the changed temperature rear end temperature sensing part and converting the temperature into angular displacement of the bourdon tube;
A link mechanism connected to the bourdon tube temperature measuring mechanism for converting an angular displacement of the bourdon tube to an output temperature on a linear scale and generating a flapper displacement to reduce an error with a reference temperature generated on a linear scale An output temperature indicator unit coupled to the reference temperature input unit via a link;
Wherein the proportional-differential operation unit is connected to the air-pressure relay two-stage amplifier, and the proportional band adjuster is used to adjust the temperature change interval proportional to the flapper operation displacement to adjust the response speed at which the nozzle back pressure changes, Wherein the proportional-integral operation unit increases the relative stability of the control operation by generating a negative feedback flapper displacement in a direction opposite to the flapper error displacement generated by the simple feedback of the temperature error, and the proportional- And a proportional-integral-differential operation mechanism for generating a displacement to increase a response speed and to eliminate a steady-state error.
The nozzle-flapper single-stage amplifier bend includes a nozzle fixing body, an air supply port provided in the nozzle fixing body and supplied with supply air sent to the air pressure relay two-stage amplifier bore, and supply air supplied through the air supply port A variable proportional band dial rotatably coupled to an upper portion of the nozzle fixing body, a hinge portion coupled to a lower portion of the nozzle fixing body, and a hinge portion rotatably coupled to the hinge portion. An auxiliary link for generating a flapper displacement to which a displacement compensated by the proportional-integral-differential action mechanism is applied, an auxiliary lever provided on one side of the auxiliary link, And a flapper which is formed on one side and rotates about the hinge part like the auxiliary link to be converted into a flapper displacement interlocking with the nozzle The control system comprising: a control system for controlling the air pressure of the air pressure control valve for temperature control.
The air pressure relay two-stage amplifier bend includes a relay upper body having an internal space as well as supplying air supplied from outside and supplying the supplied supply air to the outside, A relay central body provided between the relay upper body and the relay lower body, and a control unit for reducing the amount of supply air supplied to the relay upper body and reducing the amount of supply air supplied to the relay upper body, An upper diaphragm installed on one surface of the upper body of the relay and operated by a change in nozzle back pressure; and an upper diaphragm installed on one surface of the upper diaphragm, A first nozzle back pressure transfer mechanism for transferring the first nozzle back pressure to the relay main body, A second nozzle back pressure force transmitting mechanism installed on one surface of the lower diaphragm and transmitting a force by a lower diaphragm, and a second nozzle back pressure force transmitting mechanism provided on one surface of the lower diaphragm, A relay valve rod movably coupled to the insertion coupling portion of the variable opening cross sectional area port to adjust the control pressure of the output air, and a relay valve plug inserted into the other surface of the relay lower body, And a resilient spring for generating a proportional displacement, which is provided on the other surface of the relay lower body, for generating a displacement change of the relay valve rod.
The bourdon tube temperature measuring mechanism includes a liquid tank containing a liquid whose volume changes in proportion to a temperature change, a capillary tube communicating with the liquid tank and containing the liquid, and a capillary tube communicating with the capillary tube, And is fixed by a fixing plate and has one end formed in a free-end state, as well as being spirally wound so as to generate a rotation angle at the free end by a volume which is injected so that the liquid is filled with no bubbles therein and which changes in proportion to the temperature of the injected liquid A first rotatable link that rotates by a rotation angle generated by being coupled to one end of the bourdon tube, and a second rotatable link which is coupled to an end of the first rotatable link and rotates by a first rotatable link A second rotary link that rotates about a hinge by a transmission link that moves in conjunction with an end of the transmission link; And a second rotary link coupled to an end of the second rotary link, the second rotary link being rotated about the hinge and indicating an actual temperature to the temperature gauge board.
In the error generating link structure section 20, a guide rotation pivot 201 is coupled to a rear end side of the indicator bed 708 of the Bourdon tube temperature measurement mechanism section 70, The instruction temperature rotation link 202 is rotated in accordance with the rotation of the bed 708 and the center temperature of the instruction temperature rotation link 202 is shifted by the rotation instruction temperature rotation link 202, And an indicator dial (204) coupled to the indicator bed (708) for directing a reference temperature to the temperature instrument panel (709) is integrally coupled to the indicator bed (708) Control system for pneumatic control valve for control.
In order to obtain a large displacement of the error generating link with respect to the same temperature error, the length L of the indicated temperature rotating link is formed to be short and the length L of the indicated temperature rotating link is formed long to obtain a small displacement of the error generating link. And a control system for controlling the air pressure of the air pressure control valve for temperature control.
The proportional-integral-differential action mechanism section includes:
An output of the air pressure relay is fed back to the control pressure of the output air outputted from the air pressure relay, and an output signal of the air pressure relay is inputted to the input gain control unit, A proportional-integral operation part provided with a positive feedback bellows for generating a positive feedback link displacement by a control pressure of the output air;
A differential gain control unit provided at one side of the proportional-integral operation unit and receiving a part of the output air output from the integral gain control unit; and a differential gain control unit connected to the differential gain control unit, And a feedback feedback bell for the differential control sound generating a negative feedback link displacement by the control pressure of the introduced output air so as to prevent an excessive amount of feedback link displacement from being added together with the positive feedback link displacement And a proportional-differential operation unit provided in the control unit.
The integral gain control unit of the proportional-integral operation unit includes an integral gain main body, an integral gain inflow hole formed at the side of the integral gain main body and through which the output air sent from the air pressure relay two-stage amplifier unit flows, An integral gain shifting member coupled to the integral gain adjusting dial and reciprocating according to a rotation direction of the integral gain adjusting dial, and an integrating gain adjusting member formed at an end of the integrating gain shifting member, And an integrated gain adjusting member formed inside the integral gain main body, wherein the integrated gain adjusting member is inserted, and an amount of output air passing through the integrated gain adjusting member is adjusted according to the insertion position of the integrated gain adjusting member And an integration gain adjusting hole formed in the lower portion of the integral gain main body, And an output-air bellows formed in the lower part of the integral-gain main body for communicating a part of the output air to the differential gain control unit, And a discharge hole,
The differential gain control section of the proportional-differential operation section includes a differential gain main body, a differential gain inflow hole formed in the side of the differential gain main body and in communication with the communication pipe so that some output air sent from the integral gain control section flows, A differential gain adjusting dial rotatably formed on an upper portion of the differential gain adjusting dial, a differential gain shifting member coupled to the differential gain adjusting dial and reciprocating according to a rotation direction of the differential gain adjusting dial, Wherein the differential gain adjusting member is formed inside the differential gain main body and inserts the differential gain adjusting member into the differential gain adjusting member so that the output air flows in accordance with the insertion position of the differential gain adjusting member. A differential gain control means for controlling the amount of passing through the differential gain main body, Control system of the pressure control valve for temperature control of the passes through the control 02 controls the air pressure adjusting output characterized by a differential gain ejecting balls adapted to be supplied to the feedback bellows negative differential control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140029489A KR101544192B1 (en) | 2014-03-13 | 2014-03-13 | control system for pneumatic control vavle of temperature control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140029489A KR101544192B1 (en) | 2014-03-13 | 2014-03-13 | control system for pneumatic control vavle of temperature control |
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| KR101544192B1 true KR101544192B1 (en) | 2015-08-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102068704B1 (en) | 2019-07-09 | 2020-01-21 | 김준현 | Proportional pneumatic control system and method for processing of chemical mechanical polishing |
| CN116251432A (en) * | 2023-02-15 | 2023-06-13 | 北京中投润天环保科技有限公司 | Waste gas treatment system |
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|---|---|---|---|---|
| US5439026A (en) | 1992-12-11 | 1995-08-08 | Tokyo Electron Limited | Processing apparatus and flow control arrangement therefor |
| US6363958B1 (en) | 1999-05-10 | 2002-04-02 | Parker-Hannifin Corporation | Flow control of process gas in semiconductor manufacturing |
| KR101291236B1 (en) | 2003-01-17 | 2013-08-01 | 어플라이드 머티어리얼스, 인코포레이티드 | A pressure insensitive mass flow controller, a process fluid control assembly, a fluid control panel, a combination manual/pneumatic valve for a fluid control assembly, and a method of preventing a mass flow controller from participating in crosstalk in an array of mass controllers |
-
2014
- 2014-03-13 KR KR1020140029489A patent/KR101544192B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439026A (en) | 1992-12-11 | 1995-08-08 | Tokyo Electron Limited | Processing apparatus and flow control arrangement therefor |
| US6363958B1 (en) | 1999-05-10 | 2002-04-02 | Parker-Hannifin Corporation | Flow control of process gas in semiconductor manufacturing |
| KR101291236B1 (en) | 2003-01-17 | 2013-08-01 | 어플라이드 머티어리얼스, 인코포레이티드 | A pressure insensitive mass flow controller, a process fluid control assembly, a fluid control panel, a combination manual/pneumatic valve for a fluid control assembly, and a method of preventing a mass flow controller from participating in crosstalk in an array of mass controllers |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102068704B1 (en) | 2019-07-09 | 2020-01-21 | 김준현 | Proportional pneumatic control system and method for processing of chemical mechanical polishing |
| CN116251432A (en) * | 2023-02-15 | 2023-06-13 | 北京中投润天环保科技有限公司 | Waste gas treatment system |
| CN116251432B (en) * | 2023-02-15 | 2024-04-26 | 北京中投润天环保科技有限公司 | Waste gas treatment system |
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