JP5279790B2 - Damper drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper driving device capable of easily driving a damper by manual operation even when a solenoid valve falls into a poor operational performance owing to a disconnection of a control cable, etc. <P>SOLUTION: The damper driving device includes a bypass conduit 55 capable of being connected in parallel with conduits 48, 51, 52 connected to a directional control solenoid valve 50, a manual directional control valve 56 installed in the bypass conduit 55, having a first manual output port 56a for supplying compressed air A to an extension port of a pneumatic cylinder 41 and a second manual output port 56b for supplying the compressed air A to a contraction port of the pneumatic cylinder 41, a first manual opening/closing valve 58 connected to the first manual output port 56a side of the bypass conduit 55, and a second manual opening/closing valve 57 connected to the second manual output port 56b side of the bypass conduit 55. When the directional control solenoid valve 50 falls into the poor operational performance, the compressed air A is supplied to the bypass conduit 55 by manual operation. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a damper drive device that blocks air flowing in a supply passage using a pneumatic cylinder and a solenoid valve, and more particularly to a damper drive that can easily drive a damper even when the solenoid valve malfunctions. Relates to the device.

  A coal-fired power plant is equipped with a pulverized coal machine that pulverizes coal. The pulverized coal machine is supplied with temperature adjusting air in order to control the temperature in the pulverized coal machine, and the flow rate of the temperature adjusting air is adjusted by a damper. A damper for blocking the flow path is provided at the damper inlet. This damper is called a mill hatch damper, and is driven by a pneumatic cylinder and a solenoid valve. In a coal-fired power plant, steam for driving the generator is obtained by burning pulverized coal from the pulverized coal machine in a boiler, so components such as solenoid valves in the mill hatch damper drive system are It is an important part in securing the predetermined output of the power plant.

  Conventionally, as an example of a technique for improving the reliability of an electromagnetic valve, an electromagnetic valve capable of manual operation is known (see, for example, Patent Documents 1 and 2).

JP-A-10-38132 JP 2009-58073 A

  However, when the solenoid valve in the mill hatch type damper driving device stops operating due to disconnection of the control cable, there is a problem that the mill hatch type damper cannot be driven, and a predetermined output of the thermal power plant cannot be secured.

  There is a solenoid valve that can be manually operated as in Patent Document 1, but this is limited to a small solenoid valve with a small operating force, and a relatively large solenoid valve used in a thermal power plant is manually operated. Is difficult. Further, as in Patent Document 2, it is possible to recover the malfunction due to the accumulated solid matter, but in the case of disconnection of the control cable, the solenoid valve cannot operate normally.

  Therefore, it is convenient to have a damper driving device that can easily drive the damper even when the control cable for controlling the electromagnetic valve is disconnected. The problem that the damper cannot be driven due to the malfunction of the solenoid valve is not limited to the mill hatch damper of the thermal power plant, but also exists in dampers of other facilities.

  Therefore, an object of the present invention is to provide a damper driving device that can easily drive a damper manually even when the solenoid valve malfunctions due to disconnection of a control cable or the like.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that compressed air is supplied to a pneumatic cylinder via a direction switching electromagnetic valve, and the rod of the pneumatic cylinder associated with the switching operation of the direction switching electromagnetic valve A damper driving device that opens and closes a damper by reciprocation, and is provided in a bypass pipe that can be connected in parallel to a pipe connected to the direction switching solenoid valve, and provided in the bypass pipe. A manual direction switching valve having a first manual output port for supplying air to the expansion port of the pneumatic cylinder and a second manual output port for supplying compressed air to the contraction port of the pneumatic cylinder; A first manual on-off valve connected to the first manual output port side of the bypass line; a second manual on-off valve connected to the second manual output port side of the bypass line; With Serial The operation time of failure of the directional control solenoid valve, the compressed air is supplied to the bypass pipe by a manual operation, the direction switching solenoid valve is separable connected via a quick fluid coupling provided in the conduit This is a damper driving device.

  According to this invention, the supply flow path of the compressed air to the pneumatic cylinder is switched by the operation of the manual direction switching valve provided in the bypass pipe, and the pneumatic cylinder can reciprocate. The residual air in the pneumatic cylinder is discharged to the outside through the first manual on-off valve or the second manual on-off valve.

According to a second aspect of the invention, the damper drive device according to claim 1, on the upstream side of the direction switching solenoid valve and the manual directional control valve, on-off valve for the supply and stop of the compressed air It is characterized by being provided.

The invention according to claim 3 is the damper drive device according to any one of claims 1 or 2 , wherein the damper cuts off the temperature adjusting air supplied to the pulverized coal machine of the coal-fired power plant. It is characterized by being a mill hatch type damper.

  According to the first aspect of the present invention, even when the direction switching solenoid valve malfunctions due to disconnection of the control cable or the like, the compressed air is supplied to the manual direction switching valve of the bypass line, and the first manual operation is performed. By operating the on-off valve or the second manual on-off valve, the damper can be easily driven manually. That is, by changing the supply path of the compressed air in the damper driving device, the damper can be driven with a slight operating force, and the damper can be easily driven manually.

In addition , since the direction switching solenoid valve is detachably connected through a quick fluid coupling provided in the pipeline, if the direction switching solenoid valve malfunctions, the direction switching solenoid valve can be easily removed from the pipeline. Can be separated from each other, and a prompt action can be taken against the failure.

According to the second aspect of the present invention, the on-off valve for supplying and stopping the compressed air is provided on the upstream side of the direction switching solenoid valve and the manual direction switching valve. When a failure occurs, the supply of compressed air to the damper drive device can be temporarily stopped, and the safety of the pipe switching work accompanying the occurrence of a failure can be ensured.

According to the third aspect of the present invention, since the damper is a mill hatch type damper for shutting off the temperature adjusting air supplied to the pulverized coal machine, the direction switching solenoid valve does not operate due to disconnection of the control cable. Even in such a case, the mill hatch damper can be driven, and the output of the coal-fired power plant can be secured.

It is a schematic diagram which shows the pipe line structure in the state where the damper was closed by the manual direction switching valve of the damper drive device concerning embodiment of this invention. It is a schematic diagram which shows the pipe line structure in the state which the damper opened by the manual direction switching valve of the damper drive device of FIG. It is a schematic diagram which shows the pipe line structure in the state where the damper was closed with the direction switching solenoid valve of the damper drive device of FIG. It is a schematic diagram which shows the pipe line structure in the state by which the damper was opened by the direction switching solenoid valve of the damper drive device of FIG. It is a schematic block diagram of the pulverized coal machine periphery in which the damper drive device of FIG. 1 is provided. It is a front view which shows the state at the time of the expansion | extension of the pneumatic cylinder in the damper drive device of FIG. It is a front view which shows the state at the time of the shrinkage | contraction of the pneumatic cylinder in the damper drive device of FIG. It is a schematic diagram which shows the modification of the pipe line structure in the state where the damper was closed by the manual direction switching valve of the damper drive device of FIG. It is a schematic diagram which shows the modification of the pipe line structure in the state where the damper was opened by the manual direction switching valve of the damper drive device of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 9 show an embodiment of the present invention. FIG. 5 shows the pulverized coal machine 10 and its peripheral equipment installed in the coal-fired power plant. As shown in FIG. 5, the coal carried into the coal-fired power plant is put into the coal bunker 1. Below the coal bunker 1 is provided a coal gate 2 for discharging coal. Below the coal gate 2, a coal feeder 3 having a conveyor 4 for conveying coal is provided. Coal conveyed by the coal feeder 3 is supplied to the pulverized coal machine 10 through the coal supply path 5.

  The pulverized coal machine 10 has a rotation drive unit 11 having a motor and a speed reducer at its lower end. A rotary table 12 that is rotatable around an axis is provided immediately above the rotation drive unit 11. A plurality of crushing rollers 13 are provided above the rotary table 12. The upper surface of the rotary table 12 is supplied with coal from the coal supply path 5, and the coal supplied to the upper surface of the rotary table 12 is made to have a predetermined particle size by the rotary table 12 and the grinding roller 13. It is supposed to be crushed. A temperature sensor 14 for measuring the temperature in the pulverized coal machine 10 is provided on the upper part of the pulverized coal machine 10. The temperature measured by the temperature sensor 14 is converted into an electrical signal and sent to the controller 33.

  On the upstream side of the pulverized coal machine 10, a forced air fan 21 and a primary air fan 25 are provided. The air discharged from the forced air blower 21 is supplied to the air reheater 24 via the motor-driven damper 22 and the air supply passage 23. The air heated by the air preheater 24 is sent to a boiler (not shown) to which coal pulverized by the pulverized coal machine 10 is supplied. A part of the air discharged from the primary ventilator 25 is supplied to the air residual heater 24 through a motor-driven damper 26 and an air supply passage 28. The air supplied to the air residual heater 24 through the air supply passage 28 is supplied to the pulverized coal machine 10 through the air supply passage (hot air duct) 29.

  A hot air mill hatch damper 30 that adjusts the amount of heating air is provided upstream of the air supply passage 29. The hot air mill hatch type damper 30 is driven to open and close by a hot air damper driving device 40. A part of the air discharged from the primary ventilator 25 is supplied to the downstream side of the hot air mill hatch damper 30 in the air supply passage 29 via the air supply passage (cold air duct) 27. The air supply passage 27 is provided with a cold air mill hatch damper 30 ′ for adjusting the amount of cooling air. The cold air mill hatch type damper 30 'is driven to open and close by a cold air damper driving device 40'.

  A flow rate sensor 31 that measures the flow rate of the air flowing through the air supply passage 29 is provided on the downstream side of the air supply passage 29 in the air supply passage 27 at the downstream side of the merge portion. The air flow rate measured by the flow sensor 31 is converted into an electrical signal and sent to the controller 33. Further, a temperature sensor 32 that measures the temperature of the air flowing through the air supply passage 29 is provided downstream of the flow rate sensor 31 in the air supply passage 29. The air temperature measured by the temperature sensor 32 is converted into an electrical signal and sent to the controller 33.

  6 and 7 show a connection structure between the hot air mill hatch type damper 30 and the hot air damper driving device 40. FIG. In this embodiment, in addition to the hot air mill hatch type damper 30 and the hot air damper drive device 40, a cold air mill hatch type damper 30 ′ and a cold air damper drive device 40 ′ are provided. 'And the structure of the cold air damper drive device 40' conform to the structure of the hot air mill hatch damper 30 and the hot air damper drive device 40. Here, the structure of the hot air mill hatch damper 30 and the hot air damper drive device 40 is described. Only explained.

  As shown in FIGS. 6 and 7, the hot-air mill hatch damper 30 includes a damper body 30a, a rotating shaft 30b, and a drive lever 30c. The damper main body 30a is disposed in the air supply passage 29, and the central portion is connected to the rotation shaft 30b. The rotation shaft 30b is rotatably supported by a passage member (not shown) constituting the air supply passage 29. A drive lever 30c is connected to one end of the rotation shaft 30b.

  As shown in FIGS. 6 and 7, the hot air damper driving device 40 has a pneumatic cylinder 41. The pneumatic cylinder 41 is composed of an intermediate trunnion-type pneumatic cylinder, and includes a cylinder body 41a, a piston 41b, a rod 41c, a coupling tool 41d, and a coupling pin 41e. A support pin 41f is fixed to the outer surface of the cylinder body 41a. A support frame 42 including a bracket 43 is disposed in the vicinity of the cylinder body 41a. The cylinder body 41a is swingably supported by the bracket 43 via a support pin 41f. That is, the cylinder main body 41a can swing in the left-right direction with respect to the bracket 43 around the support pin 41f.

  The piston 41b is movably fitted to the cylinder body 41a, and is movable in the axial direction by compressed air. A rod 41c is connected to the piston 41b. The cylinder body 41a is provided with an expansion port 41g and a contraction port 41h for introducing the compressed air A for moving the piston 41b. A connector 41d is attached to the tip of the rod 41c. The drive lever 30c of the first damper drive device 40 is connected to the connection tool 41d via the connection pin 41e. Thereby, the damper main body 30a opens and closes the air supply passage 29 by the reciprocating motion of the rod 41c.

  3 and 4 show a pipe line configuration when the direction switching electromagnetic valve 50 in the hot air damper driving device 40 is normal. As shown in FIGS. 3 and 4, an open / close valve 46 for opening and closing the pipe 45 is provided in the pipe 45 for supplying the compressed air A in the coal-fired power plant. A pressure regulator 47 for adjusting the pressure of the compressed air A flowing in the pipe 45 is provided downstream of the on-off valve 46 in the pipe 45. A trifurcated pipe joint 61 is provided on the downstream side of the pressure regulator 47 in the pipe 45. Quick fluid couplings 61 a and 61 b are attached to an outlet on the downstream side of the pipe coupling 61.

  The quick fluid coupling 61a is a component that quickly connects and disconnects the flow path, and has a check valve (not shown) inside. The quick fluid coupling 61a has a function of preventing the compressed air A from leaking to the outside by the action of the check valve in a state where it is separated from the flow path. Another quick fluid coupling 61b in the three-way pipe joint 61 and other three-way pipe joints 62, 63 described later also have quick fluid couplings 62a, 62b, 63a, 63b, which are the same as the quick fluid coupling 61a. It has a function.

  The pipe 45 located on the downstream side of the pressure regulator 47 is connected to the air supply port 50 a of the direction switching electromagnetic valve 50 via the pipe joint 61 and the pipe 48. The direction switching solenoid valve 50 has a first automatic output port 50b, a second automatic output port 50c, a first automatic exhaust port 50d, and a second automatic exhaust port 50e in addition to the air supply port 50a. Yes. The direction switching electromagnetic valve 50 has two solenoids 50 f and 50 g, and each solenoid 50 f and 50 g is connected to the controller 33 via the control cable 34.

  The first automatic exhaust port 50d of the direction switching electromagnetic valve 50 is connected to the contraction port 41h of the pneumatic cylinder 41 via a conduit 52 as shown in FIG. The first automatic output port 50b of the direction switching electromagnetic valve 50 is connected to the contracting port 41h of the pneumatic cylinder 41 via a conduit 52 as shown in FIG. The second automatic output port 50c of the direction switching electromagnetic valve 50 is connected to the expansion port 41g of the pneumatic cylinder 41 via a conduit 51 as shown in FIG. In the middle of the pipe 52, a three-way pipe joint 62 having quick fluid couplings 62a and 62b is provided. Similarly, a three-way pipe joint 63 having quick fluid joints 63a and 63b is provided in the middle of the pipe line 51.

  The hot air damper driving device 40 includes a bypass pipe 55 that can be connected in parallel to the pipes 48, 51, 52 connected to the direction switching electromagnetic valve 50. The bypass pipe line 55 includes a first bypass path 55a, a second bypass path 55b, and a third bypass path 55c. The bypass pipeline 55 is in a state of being disconnected from the pipelines 48, 51, and 52, except when the direction switching electromagnetic valve 50 becomes defective due to disconnection of the control cable 34 or the like. That is, the upstream end of the first bypass passage 55 a is disconnected from the quick fluid coupling 61 b of the three-way pipe joint 61, and the end portion of the second bypass passage 55 b is connected to the quick fluid coupling 63 b of the three-way pipe joint 63. It is separated from. Similarly, the end of the third bypass passage 55 c is disconnected from the quick fluid coupling 62 b of the three-way fitting 62.

  A manual direction switching valve 56 is provided at the downstream end of the first bypass passage 55 a of the bypass conduit 55. The manual direction switching valve 56 has a first manual output port 56 a that supplies the compressed air A to the expansion port 41 g of the pneumatic cylinder 41. The manual direction switching valve 56 has a second manual output port 56 b that supplies the compressed air A to the contracting port 41 h of the pneumatic cylinder 41. A first manual open / close valve 58 is connected to the second bypass passage 55b connected to the first manual output port 56a. The first manual opening / closing valve 58 has a function of discharging the residual air in the pneumatic cylinder 41 that has flowed into the second bypass passage 55b to the outside when the valve is opened. The second manual opening / closing valve 57 has a function of discharging the residual air in the pneumatic cylinder 41 that has flowed into the third bypass passage 55c to the outside when the valve is opened.

  Next, the operation and action of the hot air damper driving device 40 will be described.

  When the direction switching solenoid valve 50 is operating normally based on a command from the controller 33 via the control cable 34, the switching operation of the direction switching solenoid valve 50 is performed by the voltage applied to the solenoids 50f and 50g. Is called. As shown in FIG. 3, when the air supply passage 29 is closed, a voltage is applied to the solenoid 50f, and the direction switching electromagnetic valve so that the compressed air A supplied to the air supply port 50a exits from the first output port 50b. 50 internal flow paths are switched. Thus, the compressed air A from the direction switching electromagnetic valve 50 is supplied to the contraction port 41 h side of the pneumatic cylinder 41 through the pipe line 52. Therefore, the piston 41a of the pneumatic cylinder 41 is pushed down by the compressed air A, and the air supply passage 29 is closed by the first mill hatch damper 30 as shown in FIG. Further, the residual air on the contraction port 41 h side in the pneumatic cylinder 41 is discharged to the outside from the second exhaust port 50 e of the direction switching electromagnetic valve 50 via the conduit 51.

  As shown in FIG. 4, when the air supply passage 29 is opened, a voltage is applied to the solenoid 50f, and the direction switching electromagnetic valve so that the compressed air A supplied to the air supply port 50a exits from the second output port 50c. 50 internal flow paths are switched. Thereby, the compressed air A from the direction switching electromagnetic valve 50 is supplied to the expansion port 41 g side of the pneumatic cylinder 41 through the pipe line 51. Therefore, the piston 41a of the pneumatic cylinder 41 is pushed up by the compressed air A, and the air supply passage 29 is opened by the first mill hatch damper 30 as shown in FIG. Further, the residual air on the extension port 41 g side in the pneumatic cylinder 41 is discharged to the outside from the first exhaust port 50 d of the direction switching electromagnetic valve 50 via the pipe line 52.

  Next, the pipe line switching work of the hot air damper drive device 40 when the direction switching electromagnetic valve 50 is malfunctioning will be described.

  When the control cable 34 is disconnected, no voltage is applied to the solenoids 50f and 50g, and the direction switching solenoid valve 50 cannot operate based on a command from the controller 33. In that case, as shown in FIG. 1 and FIG. 2, it is necessary to switch the pipeline of the damper driving device 40 and to open and close the first mill hatch damper 30 by manual operation. When the direction switching solenoid valve 50 is malfunctioning, the damper main body 30a will not close, and if left as it is, the inside of the pulverized coal machine 10 may be poorly cooled, or pulverized coal accumulates in the air supply passage (hot air duct) 29. There is a risk.

  When the direction switching solenoid valve 50 malfunctions due to disconnection of the control cable 34, the upstream end of the pipe 48 is disconnected from the trifurcated joint 61. Since the upstream end of the pipe 48 is normally connected to the quick fluid coupling 61a of the trifurcated joint 61, the upstream end of the pipe 48 is connected to the quick fluid coupling when the direction switching solenoid valve 50 malfunctions. It becomes remarkably easy to separate from 61a.

  Further, the branch portion 52 a of the pipe line 52 to which the first output port 50 b of the direction switching electromagnetic valve 50 is connected is also disconnected from the trifurcated joint 62. Since the branch portion 52a of the pipe line 52 is normally connected to the quick fluid joint 62a of the trifurcated joint 62, the branch portion 52a of the pipe line 52 is connected to the quick fluid joint when the direction switching solenoid valve 50 is malfunctioning. Separating from 62a is significantly easier. Similarly, since the branch part 51a of the pipe line 51 is normally connected to the quick fluid joint 63a of the trifurcated joint 63, the branch part 51a of the pipe line 51 is connected when the direction switching solenoid valve 50 is malfunctioning. It is significantly easier to disconnect from the quick fluid coupling 63a.

  Next, when the separation of the upstream end portion 48a of the pipe line 48, the branch part 51a of the pipe line 51, and the branch part 52a of the pipe line 52 is completed, for example, the end part of the second bypass path 55b is connected to the trifurcated joint. 63 is connected to the quick fluid coupling 63b. Since the quick fluid coupling 63b can be quickly connected as well as disconnected, the operation of connecting the end portion of the second bypass passage 55b to the rapid fluid coupling 63b is significantly facilitated. Thereafter, the end of the third bypass passage 55 c is connected to the quick fluid coupling 62 b of the three-way coupling 62. Since the quick fluid coupling 62b can be not only disconnected but also quickly connected, the operation of connecting the end portion of the third bypass 55c to the rapid fluid coupling 62b is significantly facilitated.

  When the connection of the second bypass path 55b and the third bypass path 55c is completed, the upstream end of the first bypass path 55a is connected to the quick fluid coupling 61b of the three-way coupling 61. Since not only the quick fluid coupling 61b but also the connection can be made quickly, the operation of connecting the end portion of the first bypass passage 55a to the rapid fluid coupling 61b is remarkably facilitated. As a result, all the ports 50a to 50c of the direction switching electromagnetic valve 50 are disconnected from the bypass pipeline 55 as shown in FIGS. When the direction switching electromagnetic valve 50 is disconnected from the bypass pipe 55, the on-off valve 46 of the pipe 45 supplying the compressed air A is closed, and unnecessary pressure acts on the pipe to be operated. It is desirable from the viewpoint of safety.

  Next, the operation of the hot air damper driving device 40 by the manual direction switching valve 56 when the direction switching electromagnetic valve 50 is malfunctioning will be described.

  When the direction switching electromagnetic valve 50 malfunctions due to disconnection of the control cable 34, the compressed air A is supplied to the manual direction switching valve 56 via the first bypass path 55 a of the bypass path 55. When the hot air mill hatch type damper 30 is closed, the manual direction switching valve 56 is manually operated as shown in FIG. 1 to supply the compressed air A to the contracting port 41h of the pneumatic cylinder 41. The rod 41c of 41 is contracted. Then, the air on the extension port 41 g side in the pneumatic cylinder 41 is discharged to the outside through the first manual opening / closing valve 58. As a result, the damper main body 30 a rotates and the air supply passage 29 is closed by the first mill hatch damper 30.

  When opening the hot air mill hatch type damper 30, the manual direction switching valve 56 is manually operated as shown in FIG. 2 to supply the compressed air A to the expansion port 41 g of the pneumatic cylinder 41. The rod 41c of 41 is extended. The air on the contraction port 41 h side in the pneumatic cylinder 41 is discharged to the outside through the second manual opening / closing valve 57. As a result, the damper main body 30 a rotates and the air supply passage 29 is opened by the hot air mill hatch damper 30.

  When the disconnection of the control cable 34 is specified and the control cable 34 is restored to a normal state, the first damper driving device 40 is returned to the pipe configuration shown in FIGS. The hot air mill hatch type damper 30 is opened and closed by 50.

  In this way, even when the direction switching solenoid valve 50 malfunctions due to disconnection of the control cable 34 or the like, the mill hatch damper 30 is supplied by supplying the compressed air A to the manual direction switching valve 56 of the bypass passage 55. It can be reliably driven manually. Therefore, a predetermined output can be secured in the coal-fired power plant, and operation with stable output is possible.

  Moreover, since the direction switching electromagnetic valve 50 is detachably connected via the quick fluid couplings 61a to 63a provided in the pipes 48, 51, 52, when the direction switching electromagnetic valve 50 malfunctions. The direction switching electromagnetic valve 50 can be easily separated from the pipes 48, 51, 52, and a quick measure against a failure can be taken. Further, an on-off valve 46 for supplying and stopping the compressed air A is provided on the upstream side of the direction switching solenoid valve 50 and the manual direction switching valve 56. The supply of the compressed air A to the hot air damper driving device 40 can be temporarily stopped, and the safety of the pipe switching work accompanying the occurrence of a failure can be ensured.

  8 and 9 show a modification of FIGS. 1 to 4. 1 to 4, the three-way joints 61 to 63 are used for disconnecting the direction switching electromagnetic valve 50 and connecting the bypass pipe 55, but the manual switching valve 71 is used instead of the three-way joints 61 to 63. The use of ˜73 eliminates the need for disconnecting and connecting the pipes, and the directional switching solenoid valve 50 can be switched to the manual directional switching valve 56 only by the switching operation of the manual switching valves 71 to 73.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the embodiment, a case has been described in which the present invention is applied to the mill hatch damper 30 for blocking the temperature adjusting air supplied to the pulverized coal machine 10 of the coal-fired power plant, but the damper is limited to this. It can be applied to facilities other than thermal power plants.

  In the above embodiment, only the operation of the hot air damper driving device 40 has been described. However, the operation of the cold air damper driving device 40 ′ is also similar to the operation of the hot air damper driving device 40, and the cold air damper is operated. Even in the drive device 40 ′, it is possible to quickly take measures against malfunction of the direction switching electromagnetic valve 50.

10 Pulverized Coal Machine 21 Pressed Ventilator 24 Air Heater 29 Air Supply Passage 30 Hot Air Mill Hatch Damper (Damper)
30 'Cold air mill hatch type damper (damper)
40 Hot Air Damper Drive Device (Damper Drive Device)
40 'Cold Air Damper Drive Device (Damper Drive Device)
41 Pneumatic cylinder 46 On-off valve 48 Pipe line 50 Direction switching solenoid valve 51 Pipe line 52 Pipe line 55 Bypass line 56 Manual direction switching valve 56a First manual output port 56b Second manual output port 57 Second manual opening / closing Valve (manual open / close valve)
58 First manual on-off valve (manual on-off valve)
A Compressed air

Claims (3)

A damper driving device that supplies compressed air to a pneumatic cylinder via a direction switching solenoid valve, and drives the damper to open and close by reciprocating movement of the rod of the pneumatic cylinder accompanying the switching operation of the direction switching solenoid valve,
A bypass pipe that can be connected in parallel to the pipe connected to the direction switching solenoid valve;
A first manual output port that is provided in the bypass pipe and supplies the compressed air to the expansion port of the pneumatic cylinder and a second manual output that supplies the compressed air to the contraction port of the pneumatic cylinder A manual directional control valve having a port;
A first manual on-off valve connected to the first manual output port side of the bypass line;
A second manual on-off valve connected to the second manual output port side of the bypass line;
With
When the direction switching solenoid valve malfunctions, the compressed air is supplied to the bypass pipe line by manual operation .
The said direction switching solenoid valve is connected so that isolation | separation is possible via the quick fluid coupling provided in the said pipe line . The direction switching on the upstream side of the solenoid valve and the manual directional control valve, a damper drive device according to claim 1, characterized in that the opening and closing valve for supplying and stopping of the compressed air. The damper drive according to any one of claims 1 and 2 , wherein the damper is a mill hatch type damper for shutting off temperature adjusting air supplied to a pulverized coal machine of a coal-fired power plant. apparatus.

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