JPS6231230B2 - - Google Patents

Description

Detailed Description of the Invention This invention detects the flow rate and temperature of a fluid that flows through a control valve and is a heat medium, and opens and closes the control valve so that the amount of heat carried by this fluid reaches a predetermined value. The present invention relates to a heat amount control device.

When heating a room with hot water, steam, etc., it is often necessary to supply a constant amount of heat. Usually, heat is supplied by connecting a radiator to a hot water pipe through which hot water flows, and flowing the hot water through the radiator to radiate heat. Therefore, in order to obtain the required amount of heat radiation, a plurality of radiators are connected in parallel or in series to a common hot water pipe to radiate heat, and hot water is bypassed from unused radiators. For this reason, the flow rate and temperature of hot water flowing through each radiator will differ between when a single radiator is used and when multiple radiators are used. Therefore, it is not possible to calculate the amount of heat from the number of operated radiators and their operating time.

This invention was made to solve such problems, and it detects the flow rate and temperature of fluid flowing through a control valve, calculates the product of the detected two, and makes sure that this product becomes a predetermined value. An object of the present invention is to provide a heat amount control device that can supply a predetermined amount of heat by controlling the opening and closing of a control valve.

In order to achieve the above object, the present invention provides a valve device having a port that is opened and closed by movement of a valve body between an input path for introducing fluid and an output path for leading out the fluid, and a valve device that is connected in series with the valve device. a flow sensor that converts the flow rate of the fluid flowing through the valve device into an electrical flow signal, a temperature sensor that converts the temperature of the fluid flowing through the valve device into an electrical temperature signal, and the flow signal and calculates the amount of heat carried by the fluid flowing through the valve device based on the temperature signal, detects a deviation between a preset setting signal and the amount of heat, and outputs a drive signal corrected based on this deviation. The heat amount control device includes a control circuit and an actuator that is driven by the drive signal to move the valve body.

[Effect]

The heat quantity control device in this invention detects the flow rate and temperature of hot water flowing out from a port opened by a valve body, compares the heat quantity signal of the fluid obtained by determining the flow rate and temperature with a set signal, and generates a deviation signal. By controlling the opening and closing of the valve body, a predetermined amount of heat can be supplied even if the flow rate of the fluid or its temperature changes, and the temperature of the room to be heated can be easily controlled.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat quantity control device according to an embodiment of the present invention will be described below with reference to block diagrams. In the figure, 1 is a valve device, 2 is an actuator that constitutes a control valve together with the valve device 1 and drives the valve device 1, and 3 is an actuator that drives the valve device 1.
is a flow sensor connected to the outlet side of the valve device 1,
4 is a control circuit.

The valve device 1 includes an input path 5 that introduces hot water as a fluid, an output path 6 that leads out the hot water to the consumer side, and a port 7 formed in a partition between the input path 5 and the output path 6.
, a valve body 8 that opens or closes the port 7, and a spring 9 that pushes the valve body 8 upward in the drawing to close the port 7 when the actuator 2 is not driven.

The actuator 2 includes a casing 10, an electromagnetic pump 11 housed in the casing 10, a coil 12 that drives the electromagnetic pump 11 in pulses using a pulse drive signal supplied from the control circuit 4,
A diaphragm 13 attached to the upper end of the casing 10, and the casing 10 and the diaphragm 13.
The air chamber 14 formed by the casing 1
0, an oil supply chamber 15 surrounded by a diaphragm 13 and an electromagnetic pump 11 and filled with oil, and a casing 1
0 and an electromagnetic pump 11, and is connected to an oil supply chamber 15 via the electromagnetic pump 11, and is filled with oil. It has a response body 17 that is pushed down, and a communication pipe 18 that communicates between the oil supply chamber 15 and the pressure chamber 16.

An orifice 19 is formed inside the communication pipe 18 to provide resistance to the flow of oil through the communication pipe 18. The responsive body 17 is connected to the valve body 8 by a rod 20.

The flow sensor 3 includes a tubular housing 21 communicating with the output path 6, an impeller 22 housed in the housing 21 and rotated by the flow of hot water, and a Hall element 23 embedded in a wall forming the housing 21. , attached to the edge of the impeller 22,
A magnet 24 that applies a pulse-like magnetic flux change to the Hall element 23 by rotation of the impeller 22, and a housing 2.
The temperature sensor 25 is attached through the flow sensor 1 and detects the temperature of hot water in the fluid flowing through the flow sensor 3.

The control circuit 4 includes an input circuit 2 that outputs a flow rate signal proportional to the flow rate of hot water from the output of the Hall element 23.
6, an input circuit 27 that outputs a temperature signal proportional to the temperature of hot water from the output of the temperature sensor 25, and the voltage signals of the input circuits 26 and 27 are multiplied, and the hot water derived via the flow sensor 3 is A multiplier 28 calculates the amount of heat that the multiplier 28 has and outputs the result as a heat amount signal, and compares the heat amount signal of the multiplier 28 with a setting signal SP having a voltage preset as the desired amount of heat to be supplied. It has a comparator 29 that outputs a deviation signal between them, and a drive circuit 30 that generates a drive signal for driving the coil 12 in accordance with this deviation signal.

In operation, when the voltage of the setting signal SP is set to a value corresponding to the desired amount of heat, the comparator 29 detects a deviation signal consisting of the deviation between the amount of heat signal and the setting signal SP, and sends this to the drive circuit 30. supply
The drive circuit 30 supplies the coil 12 with a drive signal adapted to reduce the frequency of pulse generation as the deviation signal increases. This drive signal causes the electromagnetic pump 11 to operate, and the oil supply chamber 15
Oil is forced into the pressure chamber 16, the valve body 8 is pushed down together with the response body 17, and the port 17 is opened so that the amount of heat corresponding to this drive signal can be obtained. In this way, hot water is supplied outside the diagram via the input path 5, port 7, output path 6, and impeller 22, and the impeller 22 rotates, giving a change in magnetic flux to the Hall element 23.
The input circuit 25 outputs a flow rate signal, and the temperature sensor 25 outputs a temperature signal proportional to the temperature of the hot water. The multiplication circuit 28 multiplies the input flow rate signal and temperature signal and outputs a heat amount signal. Generally, the product of the flow rate and its temperature at each point in time is the amount of heat, so the amount of heat signal represents the amount of heat that the hot water flowing through the flow sensor 3 has.

If the value of the heat amount signal of the multiplier 28 becomes larger than the value of the setting signal SP, the value of the deviation signal of the comparator 29 also becomes larger. When the deviation signal increases, the drive circuit 30 reduces the pulse generation frequency of the drive signal, reduces the pumping amount of the electromagnetic pump 11, and
The quantity of hot water passing through the port 7 is corrected by reducing the amount of depression. Through such an operation, the flow rate of hot water derived from the flow sensor is controlled in relation to its temperature, and the amount of heat supplied via the hot water eventually corresponds to the setting signal SP.

Note that the flow sensor 3 may be connected to the hot water introduction side of the valve device 1. Hall element 23 may be replaced by another element, for example a reed switch. The temperature sensor 23 may be set at the valve device 1 .

As described above, according to the present invention, the amount of heat that the fluid has is calculated by detecting the flow rate and temperature of the fluid flowing through the control valve, and the opening and closing of the control valve is controlled so that this amount of heat becomes a predetermined value. Therefore, even if the fluid flow rate or its temperature changes, a predetermined amount of heat can be supplied, and the temperature of the room to be heated can be easily controlled.

[Brief explanation of the drawing]

The figure is a block diagram of a heat quantity control device according to an embodiment of the present invention. 1... Valve device, 2... Actuator, 3...
Flow sensor, 4...control circuit, 25...temperature sensor.

Claims (1)

[Claims] 1. A valve device having a port that is opened and closed by movement of a valve body between an input path for introducing fluid and an output path for leading out the fluid, and a valve device that is connected in series with this valve device to control the flow rate of the fluid flowing through it. a flow sensor that converts the temperature of the fluid flowing through the valve device into an electrical temperature signal, and a temperature sensor that converts the temperature of the fluid flowing through the valve device into an electrical temperature signal; A control circuit that calculates the amount of heat carried by the flowing fluid, detects a deviation between a preset setting signal and the amount of heat, and outputs a drive signal corrected based on this deviation; A heat amount control device equipped with an actuator that moves a valve body.