JPS5830510B2 - remote air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a remote air conditioning control device for automatically starting and stopping a circulation pump and a heat supply device on the main body side of a cold heat source device from the terminal device side in a central air conditioning device.

Conventionally, in order to remotely control the main unit from the terminal side, it was necessary to connect each terminal unit and the main unit using low-voltage signal electrical wiring, and a central control box etc. to control signal traffic. It required construction work and was expensive.

Therefore, recently, electrical wiring for signals has been developed by detecting internal pressure fluctuations and flow rate changes in the piping route formed between the circulation path opening/closing valve installed in the terminal and the backflow prevention valve installed near the circulation pump on the main body side. Systems that remotely control air conditioning without the use of air conditioners are now being considered.

This method enables individual remote control operation, and by opening only the circulation circuit to the necessary terminals, it also has energy-saving effects such as preventing wasteful heat dissipation loss from other unused circuits. Although this is an excellent control method, if the on/off signal of the circulation pump is synchronized with the on/off signal of the cold/heat source equipment, the pump will be able to cope with the drop in circuit pressure due to volumetric contraction caused by the temperature drop in the circulation circuit after stopping. Pressurized operation may be performed intermittently during pressurization, so it is not a good idea from a safety and durability standpoint to start the cooling and heat source equipment at the same time.

Therefore, the present invention provides a control means that distinguishes and detects this pressurized operation signal and the real operation signal that opens the on-off valve of the terminal unit, and operates the cooling and heat source unit only when air conditioning operation is really required. Next, an example of an implementation configuration will be described using the drawings.

FIG. 1 shows an overall route configuration diagram of a hot water heating system equipped with the remote control device of the present invention.

In a hot water heating system in which hot water generated by a boiler 1 is circulated and supplied to a terminal unit 3 by a circulation pump 2 for heating, a circulation path opening/closing valve 4 is installed at each terminal unit (only one unit is shown in the drawing). At the same time, a remote control unit 5 is installed on the discharge side of the circulation pump 2.

This remote control unit 5 has a
a flow rate detection mechanism section that is provided with a valve body 7 that performs a check function and is displaced in response to the circulating flow rate, and has a flow rate detection microswitch 9 that detects the displacement of the valve body 7 via a valve stem 8;
Differential pressure detection that detects the pressure difference between the internal pressure of the pressure holding path 10 formed between the valve body 7 and the terminal unit opening/closing valve 4 and the internal pressure of another path introduced from the suction side path of the circulation pump 2 through the pressure introduction pipe 11. A differential pressure detection mechanism section 13 having a micro switch 12 is provided.

Broken lines indicate electrical wiring, 14 indicates a delay controller, and 15 indicates a boiler controller. A detailed explanation of the control operation will be given below using the electrical circuit diagrams shown in FIGS. 2 and 3.

First, all the terminal valves 4 are closed, the valve body 7 is also closed, and the boiler and circulation pump are stopped while maintaining the discharge pressure of the circulation pump 2 in the pressure holding path 10. think.

In this state, when any terminal valve is opened, the internal pressure in the pressure holding path 10 drops, the differential pressure detection mechanism 13 is activated, the differential pressure switch 12 is turned on, and the electrical path from the power source 16 is closed. , the circulation pump 2 is started and operated.

When the fluid starts circulating, the movable valve seat 6 is pushed upward,
Displace the valve body 7 and turn on the flow rate switch 9.

Therefore, even if the differential pressure switch 12 is turned off, the circulation pump 2 can continue to operate using the flow rate switch 9 because the flow rate switch 9 is connected in parallel to the electric circuit.

An input circuit 14a of a delay controller 14 such as a thermal timer is provided in parallel with the circulation pump 2, and an output circuit 14b of the delay controller is connected in series to the operation controller 15 of the boiler 1. It confirms that the circulation pump has continued to operate for a set period of time, detects that it is not simply pressurizing operation, and then operates a cold heat source such as a boiler.

FIG. 3 shows another embodiment characterized in that the output side circuit of the delay controller 14 is inserted in series after passing through the differential pressure switch 12 and the flow rate switch 9 to form an electrical circuit for the cooling/heating source device. An example is shown.

As explained above, according to the present invention, the circulation pump can be started up immediately according to the differential pressure switch, and at the same time can be operated via a delay control circuit to detect that this operation is not a continuous pressurized operation. This has a great effect in actual use, as it allows cold and heat source equipment such as boilers to be started up safely and reliably.

In addition, in the circuit system shown in FIG. 3, the starting time is the same as described above, but when stopping, the flow switch 9 is turned OFF upon detecting that the circulating flow has stopped, and the differential pressure switch 12 is turned OFF. Since it has already been turned off, the cold and heat source equipment can be stopped at the same time as the circulation pump.

[Brief explanation of the drawing]

Fig. 1 is an overall route configuration diagram of a hot water heating system equipped with a remote control device according to an embodiment of the present invention, Fig. 2 is an electrical control circuit diagram, and Fig. 3 is an electrical control circuit diagram of another embodiment. . 1...Cold heat source machine (boiler), 2...
Circulation pump, 3...Terminal unit, 4...Opening/closing valve, 7...Backflow prevention means (valve body), 9.
...Flow rate switch (flow rate detection microswitch), 12...Differential pressure switch (differential pressure detection microswitch), 14...Delay controller.

Claims (1)

[Scope of Claims] 1. In a remote air conditioning control device for central air conditioning, in which a cold heat source device and a terminal device are separated and connected via piping, and air conditioning is performed by circulating thermal fluid using a circulation pump, each terminal device has a A thermal fluid circulation path opening/closing valve is provided, and a backflow prevention means is provided at the near stop of the circulation pump, and a differential pressure switch that detects the front and rear pressure of the circulation pump including the backflow prevention means and the flow of thermal fluid in the circulation path is provided. A flow rate switch that opens and closes is connected in parallel to the electric circuit of the circulation pump, and an input terminal circuit of a delay controller such as a thermal timer is provided in parallel with the circulation pump, and the output side of the delay controller is connected in parallel to the circuit of the circulation pump. A remote air conditioning control device, which is connected in series to the electric circuit of the cold source device, and automatically starts and stops the cold source device with a delay while operating a circulation pump in response to the opening/closing operation of an on-off valve provided in a terminal device. 2. Claim 1, characterized in that the output side of the delay controller is connected in series after passing through a differential pressure switch and a flow rate switch that are connected in parallel to form an electric circuit for the cold/heat source device. remote air conditioning control device.