JPS584255B2 - remote air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a cold/hot water type central air conditioner, in which the capacity of each terminal unit itself can be adjusted and the cooling/heat source unit or circulation unit can be controlled by opening/closing the circulation flow path opening/closing valve provided in each terminal unit. The present invention aims to provide a device that remotely controls heat supply means for each terminal.

Conventionally, remote automatic operation control of main body equipment such as cooling/heat source equipment and circulation pumps from each terminal has been made possible by wiring low-voltage electrical signals between each terminal and the main body.

In this method, a. Complex electrical wiring work is required.

b. Heat loss from piping to unused terminals cannot be prevented.

c. As a result, it becomes expensive.

It had drawbacks such as. The present invention eliminates the drawbacks of the prior art.

As a configuration for this purpose, the present invention separately connects a cold source device and a terminal device such as a radiator with piping, and provides a fluid circulation device such as a circulation pump near the cold source device and a circulation circuit to each terminal device. An on-off valve that opens and closes and a backflow prevention means are provided on the discharge side of the circulator, and a discharge side pressure transmission path that transmits the pressure on the discharge side of the circulator and a suction side pressure transmission path that transmits the suction side pressure are provided. A pressure chamber A that is connected to each other, and another pressure chamber B that introduces the pressure between the backflow prevention means and the opening/closing valve.
A differential pressure detection means is provided to detect the differential pressure between the respective pressure chambers, and to stop the circulator when the differential pressure is larger than a set value and to operate the circulator when it is smaller, and to detect the circulating flow rate. A flow rate detection means is provided in the circulation circuit, and when the opening/closing valve is opened by a signal from the flow rate detection means and the fluid is circulating, the discharge side pressure transmission path is opened, and when the flow rate decreases due to the closure, the opening/closing valve is opened. A pressure transmission path control means that closes the pressure transmission path is provided.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a system diagram of a hot water type central air conditioner for explaining the principle of the present invention.

A circulation pump 2, which is a circulating device that circulates hot water generated by the hot water boiler 1, is installed near the hot water boiler 1, and each terminal is connected to the hot water boiler 1 via branch headers 3a and 3b separately from the hot water boiler 1. The air is circulated and supplied to the air conditioners 4, 5, and 6 for heating.

The discharge side circulation circuit near the circulation pump 2 is provided with a backflow prevention means 7 that performs a backflow prevention function when the circulation of hot water, which is a thermal fluid, is stopped. A fluid retention path 10 is formed between them.

A pressure chamber A13 is connected to a pressure chamber A13 that connects a discharge side pressure transmission path 11 that transmits pressure with a backflow prevention means on the discharge side of the circulation pump, and a suction side pressure transmission path 12 that transmits suction side pressure, and a backflow prevention means. It has another pressure chamber B14 into which the pressure between the means 7 and the on-off valves 8 and 9 is introduced, and is configured to detect the differential pressure between each pressure chamber.If the differential pressure is larger than the set value, the circulation pump A differential pressure detecting means 15 is provided which stops the pump 2 and starts the operation when the pressure is small.

The circulation circuit is provided with a flow rate detection means 17 for detecting the circulation flow rate.

Furthermore, the discharge side pressure transmission path 11 has a flow rate detection means 1.
A pressure transmission path control means 17 is provided which detects a decrease in the flow rate of the circulation circuit based on a signal 7', closes this path, and opens it when fluid is circulating.

When the differential pressure is larger than the set value, the circulator is stopped, and when it is smaller than the set value, the circulator is operated.The differential pressure detecting means 15 opens the circulation circuit opening/closing valve 89 provided in the terminal unit, thereby opening the fluid holding path 10 and the circulation pump 2. The differential pressure detection means 15 detects a drop in the differential pressure between the suction side of The transmission path control means 17 closes the discharge side pressure transmission path 11, introduces the suction side pressure of the circulation pump into the differential pressure detection means 15, detects an increase in the differential pressure, and controls the circulation pump 2 and the combustion control device 16. Operation is stopped.

In FIG. 1, reference numeral 18 indicates a heat exchanger for the terminal, and reference numeral 19 indicates a water tank for supplying water to the circulation circuit.

Next, a detailed explanation will be given of the control unit 20, which includes the backflow prevention means 7, the differential pressure detection means 15, the pressure transmission path control means 17, the flow rate detection means 17', and the like.

In FIG. 2, between the inflow port 21 and the outflow port 22 of the control unit 20, there is a plastic material, etc. whose outer peripheral portion is fixed to the frame wall and which has an upward biasing force in the diagram with the center portion open. A movable valve seat 23 is provided, and a valve body 24 is brought into contact with the valve body 24 by the action of a spring 25 to change its position during low flow rate circulation, thereby forming a flow rate detection means 17'.

A thin fluid passage 26 is cut out in the part of the valve body 24 that abuts the movable valve seat 23 to enable the detection of a minute flow rate, and when the circulating flow is stopped, a reverse fluid passage 26 attached to the center of the valve body 24 is provided. A stopper packing 27 is brought into close contact with a fixed valve seat 28 provided separately from the movable valve seat 23 to achieve a backflow prevention function.

A pressure chamber A3 is provided by a diaphragm 29 adjacent to this valve portion.
The pressure chamber B31 is divided into two chambers, a pressure chamber B31 and a pressure chamber B31, and a differential pressure detection section is provided to detect the differential pressure between each pressure chamber.

The discharge side pressure of the circulation pump 2 is introduced into the pressure chamber A30 from the upstream side of the movable valve seat 23 and the downstream side of the fixed valve seat 28 via the discharge side pressure transmission path 32, and the suction side pressure is introduced into the pressure chamber A30 from the upstream side of the movable valve seat 23 and downstream of the fixed valve seat 28. It is introduced via the pressure transmission path 33.

Note that the path resistance of the discharge side pressure transmission path 32 is set to be smaller than the path resistance of the suction side pressure transmission path 33 by making the path cross-sectional area larger.

When the circulation flow rate decreases, the movable valve seat 23 comes into contact with the movable valve seat valve seat 34 provided on the fixed valve seat portion, so that only the suction side pressure of the circulation pump 2 is introduced into the pressure chamber A30. The pressure transmission path control means 17 also functions as the pressure transmission path control means 17.

The downstream pressure of the valve body 24 is introduced into the pressure chamber B31, and the differential pressure with the pressure chamber A30 is taken out as a displacement of the diaphragm 29 to open and close the microswitch 35.

Further, 36 is a filter for removing foreign matter and dust from the circulation circuit.

Next, the operation of this control unit 20 will be briefly explained.

When the circulation circuit opening/closing valves 8 and 9 provided in the terminal device are opened, the high pressure held in the fluid holding eave passage 10 between the circulation circuit opening/closing valve and the valve body 24 escapes to the path after the circulation circuit opening/closing valve. .

For this reason, the internal pressure of the pressure chamber B31 of the differential pressure detection section that introduces the pressure of the fluid holding path 10 decreases, and the diaphragm 2
9 is pushed upward by the spring 37, turns on the micro switch 35 provided outside, and turns on the circulation pump 2.
The combustion control device 16 then starts operating.

Since water, which is a thermal fluid, starts to flow in the circulation circuit, the valve body 27 and the movable valve seat 23 are displaced upward, and a discharge side pressure transmission path 32 communicating with the circulation circuit and the pressure chamber A30 is opened.

When the circulation flow rate is large, the discharge side pressure of the circulation pump 2 is introduced into the pressure chamber A30 via the discharge side pressure transmission path 32 with low path resistance, and the diaphragm 29 is maintained upward, and the circulation pump 2 and Continue operation of the combustion control device.

Note that at this time, the pressure chamber A is
The thermal fluid introduced into the circulation pump 30 returns to the suction side of the circulation pump 2 in a small amount via the suction side pressure transmission path 33 (see FIG. 3).

Next, when there is no need for heating and the circulation circuit opening/closing valves 8 and 9 are closed, the circulation flow rate decreases, so the valve body 24 gradually descends, and finally the valve body 24 moves as shown by the imaginary line in FIG. It comes into contact with the seat 23, and a small amount of hot fluid flows through the narrow fluid passage 26 provided in the valve body.

Furthermore, when the circulation circuit opening/closing valve is closed and the flow rate reaches Q1 shown in FIG. In order to contact the valve seat 34 for the movable valve seat and close the discharge side pressure transmission path 32, suction pressure is applied to the pressure chamber A30 instead of the conventional circulation pump discharge pressure, so the diaphragm 29
is overpowered by the spring 37 and is largely displaced downward, turning off the microswitch 25.

Therefore, the operation of the circulation pump 2 and the combustion control device 16 is stopped, and the thermal fluid in the circulation circuit tries to flow backwards, but the check packing 27 comes into contact with the fixed valve seat 28 and prevents this, opening and closing the circulation circuit. Fluid retention path 10 between valves 8 and 9
The pressure immediately before the circulation pump 2 is stopped is maintained.

Thereafter, the above operations are repeated according to the opening/closing operations of the circulation circuit opening/closing valves 8 and 9 provided in the terminal, thereby enabling remote control operation of the circulation pump 2 and the combustion control device 16.

As described above, this control unit 20 sets the resistance of the discharge side pressure transmission path 32 to be smaller than the resistance of the suction side pressure transmission path 33, and when the flow rate of the circulation circuit decreases, the control unit 20 sets the resistance of the discharge side pressure transmission path 32 to be smaller than the resistance of the suction side pressure transmission path 33, and when the flow rate of the circulation circuit decreases, The discharge side pressure transmission path is closed by the pressure transmission path control means called the valve seat 23, and the pressure chamber A30 is closed.
This system introduces only the suction side pressure of the circulation pump 2 into the system, and has the advantage of simplifying the configuration, such as being able to detect the flow rate and close the discharge side pressure transmission path with the movable valve seat 23. There are other methods of introducing only the suction side pressure.

FIG. 4 shows a principle diagram of another embodiment of the method of introducing pressure into the pressure chamber A.

A backflow prevention means 7 is provided on the discharge side of the circulation pump 2, and a discharge side pressure transmission path 11 is connected to the pressure chamber A13 of the differential pressure detection means 15.
, the suction side pressure transmission path 12 and a three-way valve 38 which is a pressure transmission path control means, and is configured such that the discharge side pressure or the suction side pressure is introduced by the path switching operation of the three-way valve 38.

The pressure of the fluid holding path 10 is introduced into the pressure chamber B14.

Fluid holding path 10 when the circulation circuit opening/closing valve is opened
The flow detection means 17' detects a decrease in the flow rate of the circulation circuit due to the closing of the circulation circuit opening/closing valve, and the three-way valve 38 detects a decrease in the pressure of The path is switched from the discharge side pressure transmission path 11 to the suction side pressure transmission path 12 side, and only the suction side pressure of the circulation pump is introduced into the pressure chamber A.

Further, when the circulation circuit flow rate becomes large, the three-way valve 38 is switched again, and only the pressure on the discharge side of the circulation pump is introduced into the pressure chamber A.

As described above, the present invention makes use of pressure fluctuations in the fluid holding path caused by the opening and closing of the circulation circuit opening/closing valve, starts at least the circulation pump, and detects a decrease in the circulation circuit flow rate caused by the closing of the circulation circuit opening/closing valve. Introducing the suction side pressure of the circulation pump to the pressure detection means,
This stops the circulation pump, etc., and has the following effects.

(1) Remote and individual control of cooling and heating sources, circulation pumps, etc. can be performed from individual terminals without complicated electrical wiring or laborious wiring work.

(2) When not in use, the circulation circuit opening/closing valve installed in the terminal is closed, so as a result, no hot fluid is circulated to the terminal circulation circuit, preventing piping heat loss and realizing energy-saving control. .

(3) Start-up operation is performed by detecting differential pressure fluctuations, and stop control is performed by introducing the circulation pump suction side force into the differential pressure detection means by utilizing the decrease in the circulation circuit flow rate. It is not affected by variations in head performance due to accompanying pressure fluctuations in the circuit or the size of circulation pump capacity, etc., and can be applied to all types of cold/hot water type central air conditioners.

(4) When the circulation circuit flow rate decreases, the introduction of the discharge side pressure to the differential pressure detection means is stopped and the suction side pressure is introduced to activate the differential pressure detection means, because the pressure difference between the two is large. It is possible to reliably operate the differential pressure detection means.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a hot water heating system showing an embodiment of the present invention, Fig. 2 is a sectional view of the control unit section in the embodiment of the present invention, Fig. 3 is a diagram explaining the control characteristics of the control unit, 4
The figure is a system diagram showing another embodiment of the present invention. 1...Cold heat source machine (hot water boiler), 2...Circulating machine (
circulation pump), 4, 5, 6... terminal device, 7... backflow prevention means, 8, 9... opening/closing valve, 10... fluid holding path, 11, 32... discharge side pressure transmission route, 12,
33... Suction side pressure transmission path, 13, 30... Pressure chamber A, 14, 31... Pressure chamber B, 15... Differential pressure detection means, 17... Pressure transmission path control means, 17 '...
Flow rate detection means.

Claims (1)

[Claims] 1. A cold heat source device and a terminal device such as a radiator are separated and connected via piping, and a fluid circulation device such as a circulation pump is provided near the cold heat source device;
Each terminal device is provided with an on-off valve that opens and closes a circulation circuit, and a backflow prevention means is provided on the discharge side of the circulator, and a discharge side pressure transmission path that transmits the pressure on the discharge side of the circulator and a pressure on the suction side is transmitted. The pressure chamber A has a pressure chamber A that connects the suction side pressure transmission paths, and another pressure chamber B that introduces the pressure between the backflow prevention means and the opening/closing valve, and detects the differential pressure between the respective pressure chambers. A differential pressure detection means is provided to stop the circulator when the differential pressure is larger than a set value and to operate it when it is smaller, and a flow rate detection means for detecting the circulation flow rate is provided in the circulation circuit, and a signal from the flow rate detection means is provided. A remote air conditioning control device provided with a pressure transmission path control means that opens a discharge side pressure transmission path when the opening/closing valve is opened and fluid is circulating, and closes it when the flow rate decreases as the valve is closed. 2. The remote air conditioning control device according to claim 1, wherein the discharge side pressure transmission path is set to have a smaller resistance than the suction side pressure transmission path.