KR101811299B1 - Valve actuator with thermoelectric semiconductor cooling module - Google Patents

Abstract

The present invention relates to a technique relating to a valve actuator with a thermoelectric semiconductor cooling device, controlling the operation of a motor operated valve (MOV) used in an industrial facility such as a power plant or the like, and more specifically, relates to a valve actuator with a thermoelectric semiconductor cooling device, which is able to prevent shortening the lifespan of a control board by controlling the internal temperature of a control unit having the control board positioned inside to control the operation of an MOV driving device. In addition, according to the present invention, the thermoelectric semiconductor cooling device is installed in an operation part on a front surface of the control unit of the MOV driving part, and a fire-retardant heat insulating material is installed on the exterior of the control unit, thereby obtaining an effect to effectively cool and maintain the internal temperature of the control unit. The temperature of the control board where reliability rapidly decreases at a high temperature of 40 C or more is cooled and controlled, thereby obtaining an effect to stably operate the facility. Accordingly, an unplanned stop or trouble with an MOV-related system of the industrial facility is prevented, thereby reducing unplanned expenditures.

Description

Technical Field The present invention relates to a valve actuator with a thermoelectric semiconductor cooling device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve actuator for controlling the operation of a motor operated valve (MOV) used in an industrial facility such as a power plant, and more particularly, Which can prevent the service life of the control board from being shortened by controlling the internal temperature of the valve actuator control unit having a control card for controlling the operation of the electric motor, The present invention relates to a valve actuator having an apparatus.

In general, industrial facilities such as thermal power plants are equipped with various types of valves such as motor-driven valves and air-operated valves in the fluid piping system, and they are designed for the structural (ASME) and Korea Electric Power Industry Technical Standard (KEPIC), so that it can be used in industrial facilities.

These valves are mechanical equipment designed to shut off, mix or control the flow of process fluid, or to control the pressure and temperature of the fluid. If the valve is classified according to the drive source, a manual valve and a power operated valve (POV) The latter can be divided into an air operated valve (MOV) and a motor driven valve (MOV) according to the energy source such as pneumatic or electric power.

Hereinafter, a driver (hereinafter, referred to as 'valve driver') of the motor drive valve (hereinafter, referred to as 'motor valve') is a device for generating a driving force for driving a valve as a motor, To close the valve or to control the desired valve opening degree.

Particularly, the valve actuator control unit has a control card built therein to control the operation of the electromotive valve, and the valve is automatically controlled according to a command of the control system of the control board.

Such valve actuators must maintain their original properties during the life of the design in the operating environment of the valve in which they are to be used. It is desirable that the motorized valve be located in the vicinity of high temperature devices such as water heaters, reheaters, steam generators The temperature of the peripheral portion of the high-temperature apparatus is formed to be very high at 65 ° C or more due to heat transfer such as conduction or radiation of the high-temperature apparatus, thereby increasing the temperature of the valve driver.

That is, as the valve driver is heated by an ambient heat source, the internal temperature of the valve driver control unit is raised, and accordingly, the control board built in the control unit has a characteristic that the service life is shortened as the temperature increases. It is often the case that a breakdown or control board is replaced.

In addition, about 250 electric valves are installed per combined cycle power plant, and 12% of the annual electric valve control boards are replaced due to high temperature heat failure. The control board replacement cost is about 30 million won per day Million won / dog × 30).

In addition, if the power valve is shut down due to a malfunction of the motor control valve of the combined cycle power plant, the loss cost per plant is about 40 million won per cycle. If the motor control valve board is not replaced properly, Which can lead to the cost of power generation losses.

In recent years, a method of operating the control unit of the motor-operated valve at a relatively low temperature has been adopted as a method for preventing the above-mentioned loss. However, as the distance between the valve driver and the control unit becomes longer, The control accuracy is lowered and it is not a solution to the fundamental problem.

In some power plants, the cooling air is drawn from the outside to the control unit of the motorized valve and cooled. However, since the installation cost is excessive and the air is heated while the cooling air is being conveyed through the pipe, It is insignificant.

In addition, it is possible to consider cooling the control unit of the motorized valve by using a vortex tube, but it is necessary to install a very long pressure piping and an air compressor, and the cooling performance is drastically reduced due to the thermal expansion, to be.

Korea Patent No. 1634041 Korean Patent No. 1181008

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the related art, and it is an object of the present invention to provide a control board incorporated in a conventional valve driver control unit, It is a main object of the present invention to provide a valve driver provided with a thermoelectric semiconductor cooling device which is installed not only on the front surface of a unit but also can prevent the life of the control board from being shortened by controlling the internal temperature of the valve- do.

In order to achieve the above object, the present invention provides a valve driver having a control board for controlling operation of a motor-operated valve, the valve driver being coupled to a front surface of a control unit enclosure expansion pipe having a control board, And the cooling device is a thermoelectric semiconductor. The thermoelectric semiconductor cooling device according to claim 1, wherein the cooling device is a thermoelectric semiconductor.

Further, the operation unit of the present invention may further include a temperature sensor provided inside, and the temperature sensor may transmit the internal temperature of the measured control unit to the control unit, The cooling unit is operated when the internal temperature of the control unit exceeds the set temperature, and the operation of the cooling unit is stopped when the internal temperature of the control unit exceeds the set temperature. On the other hand, the control unit is provided with flame- .

The valve driver provided with the thermoelectric semiconductor cooling device according to the present invention effectively cools the internal temperature of the valve driver control unit by providing a cooling device as a thermoelectric semiconductor on the front operating portion of the valve driver control unit and providing flame- It is possible to obtain an effect to maintain the reliability of the control valve and to prevent the extension of the life of the control board and the failure of the control board by controlling the operation temperature of the control board, It is possible to minimize the power generation loss cost.

1 is a photograph showing a motor-operated valve driver including a conventional control unit.
Fig. 2 is a photograph of a motor-operated valve driver including a conventional control unit installed in an industrial facility. Fig.
Fig. 3 is a photograph of a conventional control unit separated from a valve actuator and moved to a region having a low temperature.
4 is a cross-sectional perspective view of a conventional control unit.
5 is a front view of a conventional control unit and a front view of a control unit according to a preferred embodiment of the present invention.
6 is a side sectional view showing a control unit according to a preferred embodiment of the present invention.
7 is a partially enlarged sectional view showing a control unit cooling apparatus according to a preferred embodiment of the present invention.
8 is a schematic illustration of a control unit cooling device operation according to a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve actuator for controlling the operation of a motor-driven valve used in a power plant or the like and having a cooling device, And a thermoelectric semiconductor cooling device installed in the driver control unit to control the internal temperature of the control unit, thereby preventing the service life of the control board from being shortened.

In addition, the ambient temperature of the electrically operated valve installed in the high-temperature environment of the power plant reaches about 40 to 65 DEG C, and the valve actuator and the control unit for operating the electrically operated valve are also exposed to high temperatures.

At this time, the control board incorporated in the valve driver control unit for controlling the electric valve is also exposed to high temperature and the control board is vulnerable to high temperature, so that the temperature of the control board is reduced to half The rule of thumb is to shorten the life span.

As the control board is exposed to a high temperature environment, the life of the control board is shortened and troubles frequently occur. In addition, 12% of the motorized valve control board per year per a power plant is broken due to high temperature heat, There is a problem that the maintenance and maintenance costs are further added.

In order to solve this problem, a conventional method for cooling a valve driver is a method (refer to Fig. 3) in which a control unit is installed and operated at a relatively low temperature (method 1) or a method in which a heat exchanger or a coolant is transferred to a control unit 2, there is a problem that as the distance between the motor-driven valve and the control unit increases, the cost of the installation is increased and the control accuracy is lowered and the operational reliability is lowered. In the method 1, the method 2 is suitable for the high- The cooling effect is insignificant, excessive installation cost is required, and there is a limitation in miniaturization of the cooling device.

In order to solve the above problems, the present invention provides a thermoelectric semiconductor cooling apparatus which is suitable for a high-temperature environment of a power plant and has excellent cooling effect in a valve driver control unit and maintains the internal temperature of the control unit at 40 ° C or lower, And ultimately to minimize the cost of replacement of control boards as well as the cost of power generation losses due to control board failures.

In order to accomplish the present invention as described above,

A valve driver having a control board (200) for controlling operation of a valve electric actuator (100) in a control unit (101), the valve actuator being coupled to one side of the valve electric actuator (100) And a control unit operating unit 20 coupled to a front surface of the control unit 101 and having an operation button 22 and a control unit cooling device 30, The control unit cooling device 30 is a thermoelectric semiconductor.

The control unit control unit 20 further includes a temperature sensor 42. The temperature sensor 42 detects an internal temperature of the control unit 101 to be measured by the cooling device controller 40 And the cooling device control unit 40 operates the control unit cooling device 30 when the internal temperature of the control unit 101 received from the temperature sensor 42 exceeds the set temperature, The control unit 101 stops the operation of the unit cooling apparatus 30, and the control unit 101 includes a flame-retardant thermal insulator 61 provided in the enclosure.

Hereinafter, the present invention will be described in detail with reference to FIGS. 5 to 8 showing embodiments of the present invention.

1 and 2, the control unit 101 of the conventional valve electric actuator 100 may be mounted on one side of the valve electric actuator 100, or may be mounted on the valve electric actuator 100 as shown in FIG. And the valve driving motor 100 is operated to move the valve stem connected to the valve electric actuator 100 up and down so as to enumerate the valves Or to maintain the desired opening degree.

A preferred embodiment in which the control unit 101 of the valve electric actuator is installed is preferably as close as possible to the valve electric actuator, that is, as shown in FIGS. 1 and 2. When installed as shown in FIGS. 1 and 2, Cooling of the control unit 101 using the cooling method does not shorten the service life of the control board 200 incorporated in the control unit.

In connection with the above, the control unit 101, which is a main component of the present invention for preventing the life span of the control board 200 from being reduced,

6, the control unit enclosure 10 and the enclosure expansion pipe 14 are coupled to each other and the control board 200 is installed therein to protect the control board 200 and other components, On one side, a control unit manipulating unit 20 to be described in detail later is combined and is characterized by a tubular shape.

6, the control unit 101 of the present invention includes an enclosure expansion pipe (not shown) having a diameter larger than the diameter of the control unit enclosure 10 The extension pipe 14 extends the length of the control unit 101 as well as extends the internal space of the control unit 101 so that the built-in control board 200 is further extended Thereby realizing the effect of being able to be cooled by a large amount of cooled air.

Further, when the control unit operating portion 20 to be described later is coupled to one side, the enclosure expansion pipe 14 is provided with an additional space for facilitating installation of the control unit cooling device 40 installed in the control unit operating portion 20 There is an effect to provide.

The control unit 101 of the present invention further includes a flame-retardant insulating material 61 disposed outside the flame-retardant insulating material 61. The flame-proof insulating material 61 minimizes the transfer of external high temperature into the control unit And at the same time an effect of maximizing the cooling efficiency is realized by the control unit cooling device 30 to be described later.

In this case, the flame-retardant insulating material 61 is made of a flame-retardant added heat insulating material having a degree of flame retardancy equal to or higher than that of the flame-retardant grade 3, It is preferable to adhere.

The control unit control unit 20, which is a main component for achieving the present invention,

The control unit cooling apparatus 30 includes a plurality of operation buttons 22 and a control unit cooling apparatus 30 coupled to the front surface of the enclosure expansion pipe 14 and having a diameter larger than that of the conventional control unit operation unit The control unit cooling unit 30 is installed in the control unit cooling unit 30. At this time, in the present invention, the control unit control unit 20 is easily coupled by the casing expansion pipe 14 and the control unit cooling unit 30 can be installed The area of the control unit operating unit 20 is increased as compared with the conventional one.

In addition, it is preferable that the control unit operating unit 20 of the present invention can be easily coupled and disassembled to the front surface of the enclosure expansion pipe 14 by bolt fastening or the like.

The control unit cooling unit 30 is positioned at the center of the control unit operating unit 20 to maximize the cooling efficiency and the size and detailed position of the control unit cooling unit 30 can be determined by a person skilled in the art, The present invention is not limited thereto.

The control unit cooling device 30 is a thermoelectric semiconductor. The thermoelectric semiconductor is also called a thermoelectric device. The thermoelectric semiconductor is a general term for devices utilizing various effects due to the interaction of heat and electricity. A thermistor used in electric power, light detection, etc., a device using a Jeckeck effect used for measuring a temperature, a Peltier device used in a refrigerator or a thermostat, and the like. In the present invention, a Peltier element is used.

In addition, the thermoelectric element is largely classified into a thermistor, which is a device using a temperature change of electric resistance, a device which uses a Jecke effect, which is a phenomenon in which an electromotive force is generated by a temperature difference, and a phenomenon And a Peltier element, which is a device using a Peltier effect.

The Peltier effect used in the present invention is a phenomenon in which two terminals of a metal are connected to each other to cause current to flow therethrough, one terminal is absorbed in accordance with the current direction and the other terminal generates heat, When a semiconductor such as bismuth or tellurium having different conductivity is used, it is possible to obtain a highly efficient Peltier element having an endothermic and exothermic effect. This can change endothermic or exothermic depending on the current direction, So that it is suitable for application to a valve electric actuator control unit as in the present invention, because it can be applied to a refrigerator having a small capacity or a room temperature of a high precision.

6 and 7, the control unit cooling apparatus 30 according to the present invention is configured such that when the electric current is supplied to the control unit cooling apparatus 30, So that the endothermic heat is generated and the heat is generated from the outside of the enclosure expansion pipe 14 to cool the inside of the control unit.

6 and 7, the control unit cooling apparatus 30 includes a cooling fin 32 protruding in a rear direction of the control unit operating section 20, And the cooling fins 32 of the control unit cooling apparatus 30 are connected to the control unit operating unit 34. The control unit cooling unit 30 includes a thermoelectric element 34 installed to face the thermoelectric element 34, 20), it is possible to reduce the manufacturing cost and further increase the heat transfer efficiency.

That is, the control unit manipulating unit 20 is made of an aluminum die casting and the cooling fin 32 is made of an aluminum die casting so that heat conduction can be effectively performed.

In addition, the control unit operating unit 20 is coupled to the front surface of the enclosure expansion pipe 14, and then an outer portion of the control unit operating unit 20 is enclosed by the flame-retardant insulating material 61 to secure the heat insulating property, 6, the heat insulating coating 62 is formed on the back surface, that is, the inner surface of the control unit operating portion 20, to secure the heat insulating property.

The reason why the heat insulating coating 62 is formed on the rear surface or the inner surface of the control unit operating portion 20 is that the heat transfer is minimized through the metal surface of the operating portion 20 where the flame- This is to keep the temperature as constant as possible.

6 and 7, the control unit control unit 20 of the present invention may further include a temperature sensor 42 disposed on the inside of the control unit 20, (Not shown) or an alarm generating unit is installed on the other side of the enclosure expansion pipe 14, that is, the inside of the control unit, through one side of the operation unit 20 and the heat insulating coating 62, (Red: warning, yellow: caution, green: normal) or warning sound of the LED display part can be easily checked to realize the effect of gauging the internal temperature condition of the valve actuator.

In addition, the temperature sensor 42 transmits the internal temperature of the protective pipe 10, which is built in or connected to the communication function such as RS485, to the cooling device control unit 40, The operator located thereon can check the state of each valve drive controller unit with the same color as the numeric value displayed on the control unit 40 or the LED display unit described above.

8, when the internal temperature of the control unit 101 received from the temperature sensor 42 exceeds the set temperature, the controller 40 controls the cooling unit 30 And controls the control unit cooling device 30 to stop the operation of the control unit cooling device 30 when the temperature of the control unit cooling device 30 is lower than the set temperature. As shown in FIG.

That is, the cooling device control unit 40 stores the set temperature input from the user, receives the temperature inside the control unit 101 by the temperature sensor 42, compares the temperature with the set temperature, It is possible to realize the effect that the temperature inside the control unit 101 can be maintained at an appropriate temperature by judging the operation of the device 30 and sending or stopping the current to the thermoelectric element 34. [

8, when the temperature set in the cooling device control unit 40 is 45 占 폚, the temperature information transmitted from the temperature sensor 42 (for example, The cooling device control unit 40 drives the control unit cooling device 30 and if the temperature information transmitted from the temperature sensor 42 is below 45 ° C, It is possible to maintain the temperature inside the control unit 101 at an appropriate temperature by stopping the driving of the control unit 30. [

The cooling device control unit 40 and the temperature sensor 42 are illustrated as being located outside the control unit 101 in FIGS. 6 and 7, but the cooling device control unit 40 and the temperature sensor 42 Are all located inside the control unit 101, the external structure of the control unit 101 and the cooling device control unit 40 can be simplified.

The present invention is characterized in that the diameter and structure of the enclosure expansion pipe 14 connected to the front portion of the valve electric actuator control unit 101 in which the control board 200 is incorporated are changed, A thermoelectric element 34 and a radiating fin 36 are provided on the entire surface of the operating portion 20 opposed to the cooling fin 32. The thermoelectric element 34 and the radiating fin 36 are mounted on the control unit 20, And a control unit cooling device (30) to cool the inside of the control unit (101).

In addition, the present invention provides a temperature sensor (42) capable of measuring the internal temperature of the control unit (101) to the control unit operation unit (20) and transmits the measured internal temperature of the control unit (101) to the cooling device control unit And the cooling device control unit 40 controls the operation of the control unit cooling device 30 by comparing the internal temperature of the control unit 101 with the set temperature so that the internal temperature of the control unit 101 is maintained at an appropriate temperature Thereby preventing the built-in control board 200 from shortening its service life.

A flame-retardant heat insulating material 61 is provided outside the control unit 101 of the present invention and a heat insulating coating 62 is formed on the inner surface of the control unit operating unit 20 to minimize heat transfer inside and outside the control unit 101 The internal temperature of the control unit 101 is maintained as constant as possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is possible to carry out various changes in the present invention.

100: valve electric actuator 101: control unit
200: control board 10: control unit enclosure
14: Enclosure extension pipe 20: Control unit control unit
22: Operation button 30: Control unit cooling device
32: cooling pin 34: thermoelectric element
36: radiator pin 40: cooling device controller
42: Temperature sensor 61: Enclosure flame retardant insulator
62: Thermal insulation coating

Claims (5)

A valve actuator having a control board (200) in a control unit (101) for controlling operation of a valve electric actuator (100) used in an industrial facility such as a power plant,
A control unit 101 coupled to one side of the valve electric actuator 100 and installed with a control board 200 therein,
The control unit 101 includes an enclosure expansion pipe 14 connected to the front of the enclosure 10 and having a diameter larger than the diameter of the enclosure 10 of the control unit 101,
And a control unit operating unit 20 coupled to a front surface of the enclosure expansion pipe 14 and having an operation button 22 and a control unit cooling device 30,
The control unit 101
A flame-retardant insulating material 61 provided outside
And a heat insulating coating (62) molded inside the control unit operating portion (20)
The control unit cooling device (30)
A cooling fin 32 protruding in a rear direction of the control unit operating portion 20;
A thermoelectric element (34) installed to face the front surface of the control unit operating section (20); And
And a radiating fin (36) coupled to the front surface of the thermoelectric element (34). On the other hand,
The thermoelectric element 34 is a Peltier element that is a device using a Peltier effect,
The control unit cooling device (30)
The heat is radiated from the rear surface of the control unit operating unit 20, that is, the inside of the enclosure expansion pipe 14, and the front surface of the control unit operating unit 20, that is, the outside of the enclosure expansion pipe 14 So that heat is generated in the heat exchanger,
The control unit operating unit 20
And a temperature sensor (42) provided on the inner side,
The temperature sensor (42)
And the internal temperature of the control unit 101 to be measured is transmitted to the cooling device control unit 40,
The cooling device control unit (40)
The control unit cooling apparatus 30 is operated when the internal temperature of the control unit 101 received from the temperature sensor 42 exceeds the set temperature of 45 占 폚, And the operation of the thermoelectric semiconductor cooling apparatus is stopped.
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