KR100980753B1 - The pressure regulation type heating control system - Google Patents

Abstract

PURPOSE: A heating control system controlling a pressure difference is provided to reduce heating costs by installing a differential pressure sensor, a valve actuator, and a flow control valve in a feed pipe and a recovering pipe. CONSTITUTION: A heating control system controlling a pressure difference comprises a valve actuator(50). The valve actuator comprises a current detecting unit(55) and a differential pressure detecting unit(54). The current detecting unit detects a current supplied to a motor(40). The differential pressure detecting unit detects a pressure difference between differential pressure sensors(20,21). When a maximum current is detected, the valve actuator controls the motor and a flow control valve.

Description

The pressure regulation type heating control system

The present invention relates to a differential pressure control heating control system, and more specifically, to install a differential pressure sensor in the supply pipe and the recovery pipe connected to the inlet and outlet side of the hot water distributor for supplying hot water to each room and to open and close the recovery pipe By installing a flow control valve and a valve driver, when the differential pressure is generated in the process of adjusting the flow rate of each room in the hot water distributor to the individual valve, the flow control valve is interlocked by the differential pressure sensor to open and close the recovery pipe so that a constant differential pressure It is related to a differential pressure control heating control system that can maintain the flow rate is proportionally controlled to substantially reduce the heating cost.

In general, a heating system installed in a house or an apartment opens and closes an individual valve attached to a hot water dispenser at a temperature controller installed in each room, thereby adjusting the amount of hot water flowing into each room to set a different temperature.

However, when the individual valves in a specific room are closed, the head is increased due to the characteristic of the pump that circulates the whole hot water, and the supply pipe pressure of the hot water distributor is increased so that the flow rate is increased. Falling phenomenon occurs. In particular, in the case of central heating or district heating, which calculates the heating cost based on the total flow rate by household, there is no heating cost reduction effect by adjusting the amount of hot water.

In view of this, Korean Patent No. 902306 detects the opening / closing of each branch valve (individual valve) of the hot water distributor, and calculates the open valve number ratio, which is the ratio of the number of open branch valves, to the total number of branch valves. A technique for controlling the flow regulating valve has been proposed such that a flow rate value of the heating water passing through the supply pipe and the recovery pipe is a flow rate value obtained by multiplying the maximum flow rate value by the open valve opening ratio.

However, because these technologies have different maximum flow rate values for each generation, it is time-consuming to measure and adjust the exact flow rate value for each generation. Also, if the heating load changes by extending the veranda or expanding or remodeling the room, a technician is called. There was an irrationality that the maximum flow rate value had to be adjusted again.

In Korean Patent No. 835707, a mechanical differential pressure control system has been proposed. The differential pressure control valve for controlling the pressure difference is connected to the water supply header and the return header to adjust the internal pressure of the hot water distributor. The differential pressure control valve, which receives the pressure through the positive pressure signal tube, is connected to the fluid passage by the movement of the piston. By adjusting the opening and closing of the automatic control of the flow rate discharged to the return pipe through the return header to reduce the pressure difference between the water supply header and the return header.

However, the conventional differential pressure control valve using a mechanical diaphragm has a disadvantage that it is made of a combination of small parts such as a spring and a piston, and the internal structure is complicated, the product is expensive, and malfunction occurs when scale is generated due to corrosion.

The present invention was developed in view of the conventional problems, an object of the present invention is to install a differential pressure sensor in the supply pipe and the recovery pipe connected to the inlet and outlet side of the hot water distributor for supplying hot water to each room and the opening and closing of the recovery pipe By installing a flow control valve and a valve driver to the pressure, when the differential pressure occurs in the process of adjusting the flow rate of each room in the hot water distributor to the individual valve, the differential pressure sensor detects this and the flow rate control valve to the constant differential pressure Since the total flow rate is controlled in proportion to the opening and closing of each room to provide a differential pressure control heating control system that can substantially reduce the heating cost.

Another object of the present invention is to control the valve driver in accordance with the pressure difference and the current amount of the pipe without using a mechanical limit switch, thereby preventing the malfunction of the valve due to the assembly error in the process of assembling the valve driver and the motor and flow control valve The present invention also provides a differential pressure control heating control system that prevents friction noise caused by a short circuit of a mechanical switch.

Another object of the present invention is to periodically open and close the individual valves of the flow control valve and the hot water distributor, thereby preventing the seizure of the valve according to the pipe scale, and the differential pressure sensor generated by the water head difference on the inlet and outlet sides of the hot water distributor The present invention provides a differential pressure control heating control system that periodically corrects a measurement error of the liver to improve the reliability of the device.

To this end, the present invention is provided with an inlet side pressure differential sensor and an outlet side differential pressure sensor at both ends of the inlet and outlet of the hot water distributor having a plurality of individual valves for distributing hot water to each room, the outlet side recovery pipe of the hot water distributor A flow regulating valve operated by a motor is provided, and a valve driver controlling a motor of the flow regulating valve according to the pressure difference between the inlet side and the outlet side differential pressure sensor is provided, and any specific individual valve of the hot water distributor is opened and closed. When a differential pressure is generated in the process, the flow control valve is opened and closed together so that changes in flow rates and flow rates of other rooms do not occur.

According to the present invention, since a predetermined differential pressure is controlled between the supply pipe and the recovery pipe, the flow rate can be minimized in the process of adjusting a plurality of individual valves installed in the hot water distributor, and the heating cost can be reduced in the rate calculation method by the flow measurement.

Since the present invention directly detects the pressure in the supply pipe and the recovery pipe and controls the flow rate, it is unnecessary to install a constant flow valve installed to limit the maximum flow rate for each generation in district heating, thereby reducing the cost of purchasing expensive valves.

If a differential pressure is generated in the process of adjusting the flow rate of one room, the flow rate control valve is interlocked, and thus no change occurs in the flow rate flowing to the other room. Therefore, since there is no change in the maximum flow rate used in each room, it is not necessary to adjust the algorithm of the valve driver even if the quantity of use of the individual valves of the hot water distributor is increased or decreased in the process of increasing or decreasing the number of rooms due to expansion or remodeling. And there is an effect that the commissioning time is saved.

In the valve driver, the valve actuator is simplified and the cost is reduced by calculating the open / close position of the valve by comparing the pressure signal of the pipe with the motor current of the flow control valve instead of the mechanical limit switch for checking the position of the flow control valve. do.

In the conventional mechanical diaphragm differential pressure type valve or individual valve opening and closing pattern combination of the flow rate compensation method generated in the scale or spring of the pipes and valves, there was a problem that occurs when the mechanical spasm changes, the present invention mechanical diaphragm differential pressure method Since it does not require a static pressure signal tube, the configuration is simple, and the valve is opened and closed by detecting the differential pressure and the current of the motor, thereby reducing the effect of error.

Close the flow control valve at regular intervals and open all the individual valves to compensate for differential pressure sensor errors by measuring the head difference between the differential pressure sensors, thereby automatically correcting the seizure change to reduce the error. There is an effect that is prevented.

In addition, since only one of the individual valves in each room is opened to maintain a constant differential pressure, conventionally, noise due to an increase in the flow rate has been a problem, but the present invention reduces the flow rate and maintains the flow rate so that the pipe noise is reduced, thereby improving the reliability of the device. There is also an effect.

1 is a conceptual diagram of a heating control system of an embodiment of the present invention
2 is a block diagram of a valve actuator of one embodiment of the present invention;
3 is a control flowchart of the valve driver according to an embodiment of the present invention.

1 to 2, an embodiment of the present invention includes a hot water distributor 10 connected to a supply pipe 11 and a recovery pipe 12 through which hot water is circulated. The hot water distributor 10 is installed in each home, and the individual valves 13 are installed in each of the plurality of branch pipes according to the number of rooms, and these individual valves 13 are connected to a heating controller 15 of the temperature controller 15 of each room ( 14) is controlled to open and close.

The recovery pipe 12 is provided with a flow control valve 30 for limiting the amount of hot water supplied to the hot water distributor 10, the flow control valve 30 is a method of opening and closing by the motor 40 The motor 40 is rotationally controlled by the valve driver 50. In addition, the supply pipe 11 and the recovery pipe 12 are provided with an inlet differential pressure sensor 20 and an outlet differential pressure sensor 21 to detect the differential pressures applied to both ends of the inlet and the outlet of the hot water distributor 10. The control signal is sent to the driver 50. The flow control valve 30 is the same as the result of mounting the supply pipe 11, but it is convenient to install in the recovery pipe 12 for each home, the present invention was equipped with a flow control valve in the recovery pipe.

The valve driver 50 includes a motor driver 52 for driving the motor 40, a current detector 55 for detecting a current supplied to the motor 40, and a differential pressure detector for detecting a differential pressure ( 54 is provided and connected to the control unit 51. The differential pressure sensors 20 and 21 are connected to the differential pressure detection unit 54 through an input unit 53, and a pulse generator 56 that counts pulses of a current supplied to the motor 40 is input to the input unit 53. It is connected to the control unit 51 through.

In addition, the valve driver 50 includes a storage unit 57 for storing a maximum current value and a maximum differential pressure, a current comparison determination unit 58 for comparing a maximum current value of the storage unit 57 with a real-time current value, and a maximum differential pressure. And a differential pressure comparison unit 59 for comparing the differential pressure with real time. Here, the valve driver 50 may be independently configured to be assembled to the motor 40 and the flow control valve 30, or may be mounted inside the heating controller 14 to control the motor 40 by wire or wireless. Can be.

One embodiment of the present invention configured as described above opens and closes the flow control valve 30 according to the differential pressure and the current value, so that a mechanical limit switch is unnecessary in the valve driver 50, so that the configuration is simple and the mechanical error is reduced, and the differential pressure is constant. Since the flow rate of a specific room does not increase, heat exchange occurs sufficiently and the heating cost does not increase due to excessive flow rate.

In this heating control system of an embodiment of the present invention, the fully closed and open settings of the flow regulating valve 30 are controlled as follows. The complete closing of the flow control valve 30 is determined according to the current value supplied to the motor 40, and a signal for completely closing the flow control valve 30 in the heating controller 14 is controlled by the control unit ( 51, the motor driving unit 52 is operated to send a control signal to supply power to the motor 40 so that the motor 40 rotates in one direction. At this time, the valve in the flow control valve 30 is moved to the closed position. The flow control valve 30 has a disc type or a ball valve type valve, and in the case of a disc type, the disc shaft is lifted, and in the case of a ball valve type, the motor 40 is rotated to rotate the valve shaft.

When the valve is closed by the rotation of the motor 40, the load is applied and the current value is maximized. When the maximum current value is detected by the current detector 55, the controller 51 causes the power supplied to the motor 40 to be cut off. The motor driving unit 52 is controlled so that the flow control valve 30 is completely closed, and the maximum current value at this time is stored in the storage unit 57.

 The full opening of the flow regulating valve 30 is determined by the differential pressure. When the motor 40 is driven by the motor driver 52 of the valve driver 50 according to the control signal of the heating controller 14, the valve is closed. Move to the open position. When the flow control valve 30 is fully opened, the flow rate is maximized and the pipe pressure applied to the differential pressure sensors 20 and 21 is maximized. When the maximum differential pressure is detected by the differential pressure detection unit 54, the controller 51 The power supply to the motor 40 is cut off so that the flow regulating valve 30 is maintained in a fully open state. The maximum differential pressure and pulse driving number of the pulse generator 56 at this time are stored in the storage unit 57. It is not necessary to control the opening and closing of the valve by using a conventional mechanical limit switch.

In addition, in one embodiment of the present invention, the proportional opening and closing operation of the flow control valve 30 according to the differential pressure change of the hot water distributor 10 is as follows. First, the flow control valve 30 and each individual valve 13 of the hot water dispenser 10 is regulated by the characteristics of the pump to circulate the hot water when the individual valve 13 is closed by adjusting the temperature of a specific room in a fully open state When the flow rate of the other rooms is increased, the pressure difference applied to the differential pressure sensors 20 and 21 is input to the control unit 51 through the differential pressure detection unit 54 of the valve driver 50. The determination unit 59 compares the reference differential pressure stored in the storage unit 57 with the current differential pressure, and sends a control signal to the controller 51 so that the pressure becomes constant.

Accordingly, the controller 51 rotates the motor 40 through the motor driver 52 to supply power to the motor 40 until the differential pressure across the differential pressure sensors 20 and 21 is equal to the reference differential pressure. By opening and closing the control valve 30, there is no change in the amount of hot water flowing to other rooms that do not control the temperature.

In addition, in contrast to the above case, when the corresponding individual valve 13 is opened by controlling the temperature of a specific room, the amount of hot water flowing to other rooms is relatively reduced, thereby affecting the heating. Comparing the differential pressure across the differential pressure sensor 20, 21 with the reference set differential pressure stored in the storage unit 57, the flow control valve 30 is opened and closed until the differential pressure becomes constant, Prevents changes in the heating load.

3 is a control algorithm of the valve driver 50 according to an embodiment of the present invention, which automatically corrects an error of the differential pressure sensors 20 and 21 and periodically opens and closes the flow control valve 30 to adjust the valve according to the scale. Prevent sticking.

First, all individual valves 13 and flow control valves 30 are programmed to be calibrated once a day at full stop when heating is fully closed or after 24 hours of calibration, or 72 hours after calibration if all valves are not closed. When 72 hours have elapsed, the program is forced to calibrate every 3 days.

The automatic calibration process proceeds as follows. First, the flow control valve 30 is completely closed and the absolute values of the differential pressure sensors 20 and 21 at this time are measured by the differential pressure detection unit 54. In the differential pressure comparison unit 59, Pa = P1-P2 is compared with Pc = 0 when Pa = Ph, and Pc = Pa-Ph when Pa ≠ Ph. Then set P1 '= P1 + Pc and end the automatic calibration. Where Pa is the absolute differential pressure, P1, P2 is the pressure value across the inlet and outlet of the hot water distributor 10, Ph is the head pressure constant according to the pipe level, Pc is the pressure correction value, P1 'is the corrected pressure of P1 Value.

10: hot water distributor 11: supply pipe
12: recovery pipe 13: individual valve
14: heating controller 15: temperature control of each room
20: input differential pressure sensor 21: output differential pressure sensor
30: flow control valve 40: motor
50: valve driver 51: control unit
52: motor drive unit 53: input unit
54: differential pressure detection unit 55: current detection unit
56 pulse generator 57 storage unit
58: current comparison judgment 59: differential pressure comparison
P1: Input differential pressure sensor pressure value P2: Output differential pressure sensor pressure value
Pa: Absolute pressure difference between differential pressure sensors Ph: Pipe head pressure constant
Pc: Pressure correction value P1`: Correction value of P1

Claims (4)

delete An inlet differential pressure sensor and an outlet differential pressure sensor are respectively provided at both ends of the inlet and the outlet of the hot water distributor having a plurality of individual valves to distribute hot water to each room, and the outlet side return pipe of the hot water distributor is a motor operated flow rate. In the differential pressure control heating control system provided with a control valve, the valve actuator for controlling the motor of the flow control valve in accordance with the pressure difference between the inlet side and the outlet side differential pressure sensor,
The valve driver is provided with a current detector for detecting a current supplied to the motor and a differential pressure detector for detecting a pressure difference between the differential pressure sensors, so that the valve driver is completely closed when a maximum current is detected and fully opened when a maximum differential pressure is detected. By controlling the motor and the flow control valve to be in a state, if a differential pressure is generated in the process of opening and closing any particular individual valve of the hot water dispenser, the flow control valve is opened and closed together so that changes in flow rates and flow rates of other rooms are not generated. Differential pressure regulating heating control system. The method of claim 2,
The valve driver includes a storage unit for storing a maximum current value and a maximum differential pressure, a current comparison decision unit for comparing the maximum current value and a real time current value of the storage unit, and a differential pressure comparison unit for comparing the maximum differential pressure and a real time differential pressure, Differential pressure control heating control system characterized in that the opening and closing control of the motor and the flow control valve in accordance with the current value and the differential pressure change. The method of claim 3, wherein
The valve actuator is configured to calibrate once a day when all individual valves and flow control valves are fully closed or after 24 hours have elapsed to calibrate the error of the differential pressure sensors, and if all valves are not closed When 72 hours have elapsed based on 72 hours afterwards, heating is forced to calibrate every 3 days.
When the automatic calibration is completely closed, the absolute value of the differential pressure sensors at this time is measured by the differential pressure detection unit, and Pa = P1-P2 is compared at the differential pressure comparison unit, and when Pa = Ph, Pc = 0, When Pa ≠ Ph, the differential pressure control heating control system characterized in that Pc = Pa-Ph, and P1 '= P1 + Pc to end the automatic calibration.

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