KR200388437Y1 - Pilot valve unit for positioner - Google Patents

Abstract

The present invention relates to a pilot valve unit installed in various measurement control systems and installed in a positioner for controlling a pneumatic control valve, and configured to receive an electrical control signal in a control room and change it to pneumatic. More specifically, a piezo valve for intermittent supply of air, a main body formed with a pair of first and second valve holes adjacent to each other, first and second open / close valves coupled to the first and second valve holes, and the first and second valves. 2 Control valve for controlling the opening and closing valve, the air plate for operating the control lever and a regulator for supplying a constant pressure of air to the piezo valve, by improving the configuration of the positioner to achieve a simpler configuration, while the pilot It prevents the occurrence of error and hunting when operating the valve unit, so that more accurate and safe operation It is to provide a pilot valve unit for the positioner that is made.

Description

Pilot valve unit for positioner

The present invention relates to a pilot valve unit for a positioner for controlling a pneumatic control valve, and more specifically, to improve the configuration of the conventional positioner and to make a simpler configuration, at the same time error and hunting (hunting) during operation of the pilot valve unit The present invention relates to a pilot valve unit for a positioner which prevents the occurrence of a phenomenon and makes a more accurate and safe operation.

In general, the positioner is for opening and closing a pneumatic control valve installed at various measurement control systems and coupled to the lower part of the positioner, and the pneumatic control valve is changed as the electrical control signal input from the control room is changed to pneumatic pressure. It is a well known fact that.

Looking at such a conventional positioner in detail is composed of a torque motor, a pilot valve and a feedback part therein, according to such a configuration, the configuration is complicated because the first torque motor constituting the positioner is made of a coil moving form And a problem that grows.

In addition, according to the configuration of the conventional feedback part, the means for adjusting the angle is determined by the tension of the spring, but in this case, there is a problem in that it is difficult to realize the exact angle.

In addition, the conventional pilot valve has a lot of fine nozzle hole configuration, in this case, the fine nozzle hole is clogged by foreign matter not only causes frequent malfunction in operation, but also hunting phenomenon caused by frequent shaking occurs smooth operation This does not happen is a problem occurs.

On the other hand, conventionally, a compensation spring has been installed as a means for solving the above problems, but not only does not completely eliminate the hunting phenomenon, but the overall configuration is a problem occurs, so an alternative that can solve all the above problems is required. It is becoming.

The present invention has been devised to solve the above problems and shortcomings, and the main purpose thereof is to improve the configuration of the positioner, and to achieve a simpler configuration, and to generate errors and hunting in operation of the pilot valve unit. It is to provide a pilot valve unit for a positioner that prevents the operation to achieve more accurate and safe operation.

The pilot valve unit of the present invention for achieving the above object is installed in various measurement control systems and installed in the positioner for controlling the pneumatic control valve, and receives the electrical control signal in the control room (Control room) to change it to pneumatic In a pilot valve unit is configured to,

A piezo valve formed to control the supply of air by using a piezo metal that is changed by an electrical signal; A main body having a pair of first and second valve holes adjacent to each other having an inlet port through which air is introduced from the air supply line and an outlet port for discharging the inlet air; First and second open / close valves respectively coupled to the first and second valve holes to open and close the inlets and the outlets; A control lever coupled between the first and second valve holes and configured to operate the first and second on / off valves on both sides of the rotation shaft while being rotated by a predetermined angle; An air plate configured to move up and down by air supplied from a piezo valve in a state of being coupled to an upper portion of the main body, and an upper end thereof coupled to one end of the control lever to operate the control lever; And a regulator coupled to one lower side of the main body to regulate the air supplied from the air supply line to a constant pressure and to supply the air to the piezo valve. Is made of.

At this time, the piezo valve is a second supply for supplying air introduced from the first supply line and the first supply line opened and closed by the piezo metal to the air plate while air is supplied from the regulator to one side of the sealed housing. A line is formed, and in the other space of the housing, the first supply line or the discharge vent is varied while the discharge vent for discharging air discharged from the first supply line to the outside is changed by an electrical signal. Piezometal is installed to open and close the intersection.

In addition, the first and second open / close valves are formed in a tubular through-hole formed so as to be tightly fixed to the inner surface of the valve hole of the main body, so that air is circulated and discharged to the outlet of the main body in a state where a plurality of through-holes are formed in the center of the outer surface. A valve holder for concave inlet; A valve seat that is tightly coupled to an upper portion of the valve holder, the upper and lower sides of the valve holder being operated by the control lever and the elastic spring; And the upper end is coupled to the lower portion of the valve holder and the lower end of the valve seat and the lower end is supported by the elastic spring is operated to move up and down inside the valve holder in a state that is elastically supported by the elastic spring An insert valve having a opening and closing protrusion protruding from and to a lower end of the valve holder; Is made of.

In addition, the control lever is formed in the shape of a bar of a predetermined length (Bar) in the middle position of the hinge shaft shaft coupled between the pair of first and second valve holes formed on the body is coupled, the Both sides of the hinge shaft are coupled to the valve seat adjustment screw for adjusting the height of the valve seat while supporting the valve seat top of the on-off valve.

In addition, the air plate is a state in which a certain space is formed therein to cover the upper side of one side of the main body and a plate cover formed with a predetermined through hole in the center of the upper surface; A diaphragm formed in a plate shape to be coupled to a lower portion of the plate cover, the center portion of which is expanded or contracted upward according to the pressure of air introduced through the second supply line of the piezo valve; The upper end of the diaphragm plate is positioned inside the diaphragm plate and the plate cover which are coupled to the end of the control lever through the through hole of the plate cover while being elastically supported by the upper side of the diaphragm plate. An elastic spring for lowering the diaphragm plate; Is done.

In addition, the regulator covers a lower portion of one side of the main body is formed with a predetermined space therein, the bottom of the regulator cover is formed with a predetermined pressure adjusting bolt; Star washer spring is formed of a thin plate of the star shape is raised and lowered by a predetermined height by adjusting the pressure adjusting bolt in a state in close contact with the inside of the regulator cover; A star washer spring cover having a lower bent outer circumferential bottom in close contact with the outer circumference of the star washer spring to cover the star washer; A flat diaphragm seated on an upper end of the regulator cover as a soft material, the flat diaphragm being formed to seal the lower part and the upper part thereof; A regulator distribution plate protruding a predetermined height in a state of being installed on the top of the flat plate diagram to form a predetermined internal space, wherein an air inlet is formed in the center thereof, and a plurality of discharge holes are formed at an outer circumference thereof; An air filter seated on an upper end of the regulator distribution plate and configured to remove foreign substances in air passing through the piezo valve through the discharge hole of the regulator distribution plate; And a regulator needle pin configured to open and close the inlet hole according to the control of the pressure regulating valve while being elastically supported by an elastic spring at an upper end thereof while being coupled to the central inlet hole of the regulator distribution plate. Is done.

Hereinafter, a preferred embodiment of the present invention looks at in more detail based on the accompanying drawings.

1 is a perspective view showing a positioner and a pneumatic control valve to which the present invention is applied, and FIG. 2 is a perspective view showing a pilot valve unit for a positioner to which the present invention is applied, and FIG. 3 shows a pilot valve unit for a positioner to which the present invention is applied. 4 is an exploded perspective view showing an opening and closing valve of a pilot valve unit for a positioner to which the present invention is applied, and FIG. 5 is an exploded perspective view showing an air plate of a pilot valve unit for positioner to which the present invention is applied; 6 is an exploded perspective view illustrating a regulator of a pilot valve unit for a positioner to which the present invention is applied.

The pilot valve unit for the positioner of the present invention has a piezo valve 100 for intermittently controlling the supply of air as shown in FIGS. 1 to 6, and a main body 200 in which a pair of first and second valve holes are adjacent to each other. The first and second on / off valves 300 and 400 coupled to the first and second valve holes, the control lever 500 for controlling the first and second on / off valves, and the air plate 600 for operating the control lever. And a regulator 700 for supplying air of a constant pressure to the piezo valve.

Thus, the piezo valve 100 is formed to control the supply of air by using the piezo metal 120 is variable by the electrical signal.

That is, the piezometal 120 is installed in the sealed housing 140, while the air supply is supplied to one side of the housing 140 by the piezometal while being opened and closed by the piezometal. 142 and a second supply line 144 for supplying the air introduced from the first supply line to the air plate is formed, the other side of the housing for discharging the air in a position symmetrical with the first supply line An exhaust vent 146 is formed.

Therefore, when an electrical signal is applied to the piezometal 120 from the control room, the first supply line 142 and the discharge vent 146 of the housing! 40 are bent to the left and right through the physical deformation of the piezometal. As a result, the supply and discharge of air into the air plate is made.

The main body 200 is formed so as to smoothly circulate air between the respective components in a state in which the respective components are combined.

In particular, the first and second valve holes 220 and 240 for coupling the first and second on / off valves 300 and 400 are formed in the main body 200 to be adjacent to each other. The holes 220 and 240 have inlets 222 and 242 through which air is introduced from the air supply line 10 and outlets 224 and 244 for discharging the introduced air through bottom and side surfaces of the main body 200. Each communicates with the outside.

The first and second open / close valves 300 and 400 operate vertically while being coupled to the inside of the first and second valve holes 220 and 240 of the main body 200, respectively, and the inlets 222 and 242 of the main body 200. And the outlets 243 and 244 are opened and closed.

That is, the first and second open / close valves 300 and 400 may have valve holders 320 and 420 having upper and lower portions thereof penetrated and fixed to inner surfaces of the first and second valve holes 220 and 240 of the main body 200. And valve seats 340 and 440 tightly coupled to the upper portion of the valve holder, and insert valves 360 and 460 coupled to the lower portion of the valve holder, while the valve seat and the insert valve are elastic springs 342 and 442. , 364, 464 to be elastically supported.

In addition, the inside of the valve holder (320, 420) is penetrated so that the valve seat (340, 440) and the insert valve (360, 460) is coupled to the upper and lower portions, the air introduced into the center outer peripheral surface of the main body 200 In the state where a plurality of through holes 322 and 422 are formed so as to be circulated to the outlets 220 and 242 of the), the outer circumferential surface thereof is recessed.

In addition, the valve seats 340 and 440 are tightly coupled to the upper portions of the valve holders 320 and 420, and the elastic springs 342 and 442 are disposed at the lower portions thereof while the upper ends thereof are supported by the control lever 500. ) Is combined. Accordingly, the valve seats 340 and 440 are formed to move up and down inside the valve holders 320 and 420 by the control lever 500 and the elastic springs 342 and 442.

In addition, the insert valves 360 and 460 are for discharging air introduced into the outlets 224 and 244 of the main body 200 while opening and closing the lower ends of the valve holders 320 and 420. The upper portions of the 360 and 460 are formed to enter and exit the valve holders 320 and 420 while being closely supported by the lower ends of the valve seats 340 and 440, while the lower ends of the valve holders 320 and 420 The elastic springs 364 and 464 are coupled to the lower ends of the opening and closing protrusions 362 and 462 in a state in which the opening and closing protrusions 362 and 462 are formed to protrude. Accordingly, the insert valves 360 and 460 are moved up and down by the lifting and lowering of the valve seats 340 and 440 and the elastic springs 364 and 464, so that the opening and closing protrusions 362 and 462 are the valve holders 320 and 420. It is formed to open and close the bottom of the.

The control lever 500 is axially coupled between the first and second valve holes 220 and 240 of the main body 200 to operate the first and second on / off valves 300 and 400 on both sides of the rotating shaft while being rotated at an angle. Is formed.

That is, the control lever 500 is formed in a bar shape having a predetermined length, and the first and second valve holes 220 and 240 are formed on the main body by the hinge shaft 520 coupled to the right position of the intermediate point. The height of the valve seats 340 and 440 is supported on both sides of the hinge shaft 520 while supporting the upper end of the valve seats 340 and 440 of the first and second open / close valves 300 and 400 in a state that the shaft shafts are coupled therebetween. Valve seat adjustment screws 540 and 560 for adjusting are respectively coupled. At this time, the bottom of the valve seat adjustment screw (540, 560) is fitted into the groove in the state in which the groove is formed in the center of the valve seat (340, 440) to lock the valve seat adjustment screw (540, 560). To be combined. Therefore, the end of the control lever 500 having the configuration as described above is supported by both sides of the hinge shaft 520 while rotating the hinge shaft 520 at an angle by the lifting and lowering of the air plate 600 1,2 actuate on / off valves 300 and 400.

The air plate 600 is formed to move up and down by the pressure of the air supplied from the piezo valve 100 in a state coupled to the upper side of the main body 200 to be coupled to the end of the control lever 500.

That is, the air plate 600 is coupled to an upper portion of the one side of the protruding main body 200 in a state where the center of one side of the main body 200 protrudes so that the air plate 600 and the regulator 700 are coupled to each other. Bar, the air plate 600 is raised and lowered by the diaphragm 640 and the diaphragm which is expanded and contracted according to the air pressure as a plate material 620 and a soft material having a predetermined installation space therein, The upper end is made of a diaphragm plate 660 coupled to the end of the control lever 500 and an elastic spring 680 positioned in the plate cover to elastically support the upper side of the diaphragm plate.

Thus, the plate cover 620 has a predetermined space is formed so that the respective components are combined to move up and down therein, and a predetermined through-hole is formed so that the upper end of the diaphragm plate 660 penetrates in the center thereof.

In addition, the diaphragm 640 is formed in a plate shape to be coupled to the lower portion of the plate cover 620, the central portion of the diaphragm to the pressure of the air introduced through the second supply line 144 of the piezo valve 100 Accordingly, it is formed of a soft rubber material or silicone material so as to expand or contract upward.

Therefore, when air of uniform pressure flows from the piezo valve 100, the introduced air expands the diaphragm 640 while simultaneously raising the diaphragm plate 660, thereby expanding the diaphragm 640. When the air pressure decreases, as the diaphragm plate 660 is lowered by the elastic spring 680, the control lever 500 coupled to the upper end of the diaphragm plate 660 is operated.

The regulator 700 is coupled to one lower side of the main body 200 and is formed to control the air supplied from the air supply line to a constant pressure to supply the piezo valve 100.

That is, the regulator 700 covers each lower portion of one side of the main body 200, and each configuration and air circulation installed in the space between the regulator cover 710 and the main body 200 in which a predetermined space is formed therein. The pressure of the air introduced through the structure is regulated constantly.

Accordingly, the pressure adjusting bolt 712 is coupled to the center of the lower surface of the regulator cover 710, which is moved up and down by rotating the star washer spring 720 and the star washer spring cover 730 which will be described later. By adjusting the pressure of the air circulated to the upper side is adjusted. At this time, the star washer spring 720 is formed in a thin plate-like star shape, the star washer spring cover 730 is the lower end of the outer bent is in close contact with the outer circumference of the star washer spring 720 the plate It is formed to support the diaphragm 740.

Meanwhile, the flat diaphragm 740 is coupled between the regulator cover 730 and the lower end of the main body 200, which is formed of a soft material to seal the lower and upper portions of the regulator cover 710.

In addition, a regulator distribution plate 750 is installed at the upper portion of the flat plate diagram 740. The central portion of the regulator distribution plate 750 is formed so as to protrude a predetermined height to form a predetermined internal space therein, in the center of the air. While the inlet hole 752 through which the inlet is formed is formed, a plurality of outlet holes 754 through which air is discharged is formed. At this time, the upper outer periphery of the regulator distribution plate 750 is partitioned into the inner inlet space and the outer discharge space as shown in the figure in close contact with the lower surface of the main body 200.

In addition, an air filter 760 is installed at the upper end of the regulator distribution plate 750 to remove foreign substances in the air passing through the piezo valve 100 through the discharge hole 754 of the regulator distribution plate 750. The air filter 760 is installed in the external discharge space described above.

In addition, the regulator needle pin 770 is coupled to the central inlet hole 752 of the regulator distribution plate 750, and the regulator needle pin 770 is elastic in a state in which an elastic spring 780 is coupled to an upper portion thereof. While being supported, its lower end is installed in close contact with the flat diaphragm 740. Therefore, the inlet hole 752 of the regulator distribution plate 750 is opened and closed according to the control of the pressure control valve 712.

Therefore, the regulator 700 circulates the air introduced from the air supply line to the piezo valve 100 in a state of being stored at a constant pressure through a combination of the respective components.

Looking at the operation of the present invention by such a configuration as follows.

First, a part of the air supplied from the air supply line is introduced into the regulator 700 through a passage inside the main body 200. At this time, the pressure control of the regulator 700 is made through a pressure control valve 712 formed in the center of the regulator cover 710, the pressure is increased by turning the pressure control valve 712 in the clockwise direction and the counterclockwise In the direction of the pressure drop. Therefore, at the time of pressure adjustment, the pressure is adjusted to an appropriate pressure (1.0 kg / cm 2 .g) through the pressure gauge in the first supply line 142.

Subsequently, the air introduced into the piezo valve 100 is circulated to the air plate 600 through the second supply line 144. In this case, since the air supplied to the air plate 600 through the second supply line 144 is larger than the elasticity of the elastic spring 680 installed on the diaphragm plate 660, the air is expanded in the diagram 640. It raises the diaphragm plate 660 on the upper side.

As such, as the diaphragm plate 660 is raised, the end of the control lever 500 coupled to the upper end is pushed up, which is the first opening / closing valve 300 with the hinge shaft 520 as the fixed shaft as a fixed point. Will be lowered. At this time, the second on-off valve 400 is raised by the elasticity of the elastic springs 342 and 364 while the control lever 500 is raised as opposed to the first on-off valve 300.

On the other hand, when the piezo metal 120 in the piezo valve 100 blocks the first supply line 142 through which air is supplied from the regulator 700, at the same time the discharge vent 146 is opened to open the air plate 600 The air inflating the diaphragm 640 is discharged to the discharge vent 146 through the second supply line 144 to lower the air pressure inflating the diaphragm 640.

Therefore, when the pressure of the diaphragm 640 is reduced in this way, the elastic spring 680 elasticity lowers the diaphragm plate 660 to lower the control lever 500 coupled to the upper end of the control lever 500. 2) the second on-off valve 400 is lowered by using the hinge shaft 520, which is a rotation shaft of the motor, as a fixed point. At this time, the first on-off valve 300 is raised by the elasticity of the elastic springs 342 and 364 as the control lever 500 rises as opposed to the second on-off valve 400.

Subsequently, when the end of the control lever 500 is raised, the first opening / closing valve 300 in the front end direction of the hinge shaft 520 is fixed to the fixed point.

That is, when the control lever 500 lowers the valve seat 340 of the first on-off valve 300, the valve seat 340 lowers the insert valve 360 in close contact with the lower end of the insert valve 360. Opening and closing projections 362 of the) is spaced apart from the lower end of the valve holder (320). Therefore, the air supplied from the air supply line is introduced into the spaced gap, and the introduced air is discharged through the discharge hole 324 of the valve holder 320.

At this time, when the first on-off valve 300 is opened, the second on-off valve 400 is shortened in an elevated state, thereby preventing supply of air.

While repeating this operation at a high speed, pneumatic control for opening and closing the pneumatic control valve is made.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is only an example, and those skilled in the art may understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

According to the pilot valve unit of the present invention as described above, the configuration of the positioner is improved, and at the same time, a more accurate and stable operation is achieved by preventing errors and hunting from occurring during operation of the pilot valve unit. A very useful effect of the action is exerted.

1 is a perspective view showing a positioner and a pneumatic control valve to which the present invention is applied.

2 is a perspective view showing a pilot valve unit for a positioner to which the present invention is applied.

Figure 3 is a side sectional view showing a pilot valve unit for a positioner to which the present invention is applied.

Figure 4 is an exploded perspective view of the on-off valve of the pilot valve unit for positioners to which the present invention is applied.

5 is an exploded perspective view illustrating an air plate of a pilot valve unit for a positioner to which the present invention is applied.

6 is an exploded perspective view illustrating a regulator of a pilot valve unit for a positioner to which the present invention is applied.

<Brief description of symbols for the main parts of the drawings>

10: positioner 20: pneumatic control valve

100: piezo valve 200: main body

300: first on-off valve 400: second on-off valve

500: control lever 600: air plate

700: regulator

Claims (6)

In the pilot valve unit which is installed in various measurement control systems and installed in the positioner for controlling the pneumatic control valve, the pilot valve unit is configured to receive an electrical control signal in the control room and change it to pneumatic, A piezo valve formed to control the supply of air by using a piezo metal that is changed by an electrical signal; A main body having a pair of first and second valve holes adjacent to each other having an inlet port through which air is introduced from the air supply line and an outlet port for discharging the inlet air; First and second open / close valves respectively coupled to the first and second valve holes to open and close the inlets and the outlets; A control lever coupled between the first and second valve holes and configured to operate the first and second on / off valves on both sides of the rotation shaft while being rotated by a predetermined angle; An air plate configured to move up and down by air supplied from a piezo valve in a state of being coupled to an upper portion of the main body, and an upper end thereof coupled to one end of the control lever to operate the control lever; And A regulator coupled to one lower side of the main body and configured to adjust the air supplied from the air supply line to a constant pressure to supply the piezo valve; Pilot valve unit for positioners, characterized in that consisting of. According to claim 1, The piezo valve is supplied to the air inlet from the first supply line and the first supply line which is opened and closed by the piezo metal while the air is supplied from the regulator to one side of the sealed housing to the air plate. A second supply line is formed, and the first supply line is varied by an electrical signal inside the housing while a discharge vent for discharging air discharged from the first supply line to the outside of the housing is formed. Or a pilot valve unit for positioners, characterized in that the piezometal for opening and closing the exhaust vent cross-section is installed. According to claim 1 or claim 2, wherein the first and second open and close valve is formed in the through-hole formed through the upper and lower parts so as to be tightly fixed to the inner surface of the valve hole of the main body, the main body in the state in which a plurality of through-holes are formed in the center A valve holder having a concave inlet so that air is circulated and discharged to an outlet of the outlet; A valve seat that is tightly coupled to an upper portion of the valve holder, the upper and lower sides of the valve holder being operated by the control lever and the elastic spring; And the upper end is coupled to the lower portion of the valve holder and the lower end of the valve seat and the lower end is supported by the elastic spring is operated to move up and down inside the valve holder in a state that is elastically supported by the elastic spring An insert valve having a opening and closing protrusion protruding from and to a lower end of the valve holder; Pilot valve unit for positioners, characterized in that consisting of. 4. The hinge shaft of claim 3, wherein the control lever is formed in a bar shape having a predetermined length, and a hinge shaft axially coupled between the pair of first and second valve holes formed on the main body at an appropriate position of the intermediate point. And a valve seat adjusting screw coupled to both sides of the hinge shaft to adjust the height of the valve seat while supporting an upper end of the valve seat of the on / off valve. The air conditioner of claim 4, wherein the air plate includes a plate cover formed at a predetermined space in a state of covering an upper portion of a main body and having a predetermined through hole at the center of the upper surface thereof; A diaphragm formed in a plate shape to be coupled to a lower portion of the plate cover, the center portion of which is expanded or contracted upward according to the pressure of air introduced through the second supply line of the piezo valve; The upper end of the diaphragm plate is positioned inside the diaphragm plate and the plate cover which are coupled to the end of the control lever through the through hole of the plate cover while being elastically supported by the upper side of the diaphragm plate. An elastic spring for lowering the diaphragm plate; Pilot valve unit for positioners, characterized in that consisting of. According to claim 5, wherein the regulator covers a lower portion of the main body is formed in a predetermined space therein, and the bottom of the regulator cover is formed with a predetermined pressure adjusting bolt; Star washer spring is formed of a thin plate of the star shape is raised and lowered by a predetermined height by adjusting the pressure adjusting bolt in a state in close contact with the inside of the regulator cover; A star washer spring cover having a lower bent outer circumferential bottom in close contact with the outer circumference of the star washer spring to cover the star washer; A flat diaphragm seated on an upper end of the regulator cover as a soft material, the flat diaphragm being formed to seal the lower part and the upper part thereof; A regulator distribution plate protruding a predetermined height in a state of being installed on the top of the flat plate diagram to form a predetermined internal space, wherein an air inlet is formed in the center thereof, and a plurality of discharge holes are formed at an outer circumference thereof; An air filter seated on an upper end of the regulator distribution plate and configured to remove foreign substances in air passing through the piezo valve through the discharge hole of the regulator distribution plate; And a regulator needle pin configured to open and close the inlet hole according to the control of the pressure regulating valve while being elastically supported by an elastic spring at an upper end thereof while being coupled to the central inlet hole of the regulator distribution plate. Pilot valve unit for positioners, characterized in that consisting of.