JPS5952738B2 - remote air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote air conditioning control device used in a cold water or hot water type air conditioner. This invention relates to a remote air conditioning control device that remotely starts and stops the system, and its purpose is to reduce path loss resistance.

Conventionally, in order to remotely control the heat source equipment on the main unit side from the terminal side, a method was used to connect each terminal unit and the main unit side using low-voltage signal electrical wiring. A central control box, etc. is required, which not only requires on-site construction but is also expensive.

Recently, systems have been developed that utilize pressure and flow rate fluctuations in piping circuits to remotely control air conditioning without using electrical signal wiring.

Next, this system will be explained with reference to FIG.

This FIG. 1 is a principle configuration diagram, and numeral 1 is the main body of the heat source device, terminal device 2. 2' and 2'' are connected by piping, and cold water or hot water is circulated by a circulation pump 3.

A backflow prevention valve 4, a differential pressure detection means 5, and a flow rate detection means 6 are installed in the main piping route 8 near the circulation pump 3, and the terminal equipment 2.
2' and 2'' have flow path opening/closing valves 7 and 7', respectively.
, 7” is provided.

That is, the flow detection means 6 detects the stoppage of the circulation flow due to the closing operation of the flow path opening/closing valves 7, 7', 7'', and stops the circulation pump 3 and the heat source device main body 1, and also prevents backflow. A pressure on the verge of stopping the circulation pump 3 is maintained between the pump and the valve 4.

Next, the pressure difference detection means 5 detects the pressure drop caused by opening of the flow path opening/closing valves 7°7/, 7//, starts the circulation pump 3 and the cold/heat source main body 1, and remotely controls the pressure drop. It is possible to drive.

This conventional method has a check valve 4 in the main piping route 8, so when a large flow rate is required, such as when the number of terminals used increases or when applied to large-scale equipment, This method has disadvantages in that path loss resistance increases, a predetermined flow rate cannot be circulated, and a large-capacity circulation pump is required.

The present invention solves the following drawbacks by providing a bypass path. Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment in which the differential pressure detection means, flow rate detection means, backflow prevention valve, bypass path, etc. required on the main body side are integrated into a unit.

That is, the inside of the unit body 9 is divided into a detection path 10 and a bypass path 11, and on the detection path 10 side,
A first check valve 12 that also serves as a flow rate detection valve is provided.

This backflow prevention valve 12 is biased toward the valve seat 14 by a biasing spring 13, and when the circulating flow of cold water or hot water stops due to opening of the terminal valve, the backflow prevention valve 12 is The stopper seal 15 comes into contact with the valve seat 14 and performs a backflow prevention function.

At this time, the check valve 12 simultaneously contacts the movable valve seat 16 made of a flexible material, pushes it downward, and turns off the external flow rate switch 19 via the arm 17 and sealing means 18.

Next, at the start of circulation flow, when a small amount of cold water or hot water flows through the slit groove 20 provided on the side of the check valve body 12, the check valve body 12 is lifted together with the movable valve seat 16, and the external micro switch 19 is turned on. .

The flow rate detection section is configured as described above.

In addition, a bellows frame 21 is disposed on the upper part of the flow rate detection section, and is moved up and down according to the rise or fall of the internal pressure of the circuit.
A differential pressure detection section is provided.

On the other hand, the bypass path 11 is provided so as to bypass the non-return valve 12, and this bypass path 11 is also provided with a second non-return valve 25 which is similarly urged toward the valve seat 24 by a biasing spring 23. It is being

Here, the relationship between the check valve 12 and the check valve 25 is as follows.

That is, at the start of circulating flow, cold water or hot water first flows to the detection path 10 side, and the flow rate switch 1 of the flow rate detection section
9 is turned on, the check valve 25 is opened next, so that the flow flows to the bypass path 11 side, and when the circulation flow decreases to the point of stopping, the bypass path 11 side is closed first, and the detection path 10 side is closed later. The operating point is shifted so that

In addition, the spring force of the biasing spring 13 and the biasing spring 23 is set for this purpose, and this means that cold water or hot water flows only to the bypass path 11 side when the flow rate is low, such as when the number of terminals in use is small, and the detection is detected. This is to eliminate the undetectable state of no flow to the path side and to maintain the minute flow rate detection function as a 2-nit unit.

To briefly explain the operation, when the internal pressure in the circuit decreases due to the opening of the flow path opening/closing valve of the terminal device, the bellow flamm 21 is displaced downward and the differential pressure switch 22 is turned ON. Then, the circulation pump, cold water, or hot water heat source equipment is turned on. The main body starts up and circulating flow begins.

Cold water or hot water first flows to the detection path]0 side, displacing the check valve 12 upward, and turning on one flow rate switch.

At this point, the bellows flam 21 rises again as the circuit internal pressure rises, and the differential pressure switch 22 of the differential pressure detection section turns OFF.

That is, during normal use, the operation of the circulation pump and the cold/heat source device is continued by the flow rate switch 19 of the flow rate detection section.

Furthermore, when the number of terminals in use increases, the bypass path 11 force f is opened, and from then on, in a state where a large flow rate is circulated, most of the circulating flow amount flows to the bypass path 11 side.

Therefore, the path loss resistance can be extremely small compared to the conventional system in which cold water or hot water flows only on the detection path 10 side.

When the on-off valves of all the terminals are closed and the circulating flow decreases and is about to stop, first the check valve 25 on the bypass path 11 side closes, and finally the check valve 12 on the detection path 10 side closes. to turn off the flow rate switch 19,
Stop operation of the circulation pump and the cold/heat source equipment.

At the same time, the pressure immediately before the circulation pump is stopped is maintained between the check valves 12, 25, and the terminal valve.

Repeat the following steps. As described above, the present invention provides cold water,
Alternatively, differential pressure detection means installed near the circulation pump, cold water, or hot water heat source equipment body can detect changes in circuit pressure and flow rate due to opening/closing operations of a flow path opening/closing valve installed on the terminal side of a hot water type air conditioner. In this system, the path loss resistance is reduced by providing a bypass path, and the flow rate is detected by a flow rate detection means and remotely started/stopped.

(1) When the number of terminals used increases or when applying the same to large-scale equipment, the path loss resistance can be greatly reduced at times of large flow, and therefore the terminal Insufficient circulation flow can be prevented, and the circulation pump capacity can be reduced.

(2) In the embodiment, when the circulating flow starts, the first
The non-return valve is operated in the order of the second non-return valve on the bypass path side, and immediately before the circulation flow is stopped, the order is reversed, so that the minute flow rate detection function can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the principle of a conventional example, and FIG. 2 is a new front view of a remote air conditioning control device according to an embodiment of the present invention, with key features included. 10...detection path, 11...bypass path, 12...first check valve, ]3...
...Biasing spring, 19...Flow rate switch, 22
...Differential pressure switch, 25...Second backflow prevention valve, 23...Biasing spring.

Claims (1)

[Claims] 1. A heat source device for obtaining cold water or hot water, a terminal device connected to the heat source device via a circulation pump, a first check valve provided near the circulation pump, and the terminal device. A flow path opening/closing valve provided in the machine, a differential pressure detection means that detects the circuit internal pressure and circulation flow rate that change in response to the opening/closing operation of the flow path opening/closing valve, and starts and stops the circulation pump and heat source device, and the flow rate. What is claimed is: 1. A remote air conditioning control device comprising: a detection means, a bypass path that bypasses the check valve, and a second check valve provided in the bypass path. 2. The remote air conditioning control device according to claim 1, wherein the first check valve also serves as a flow rate detection means. 3. When the circulation flow starts, the second check valve opens after the first check valve opens, and when the circulation flow decreases, the first check valve closes after the second check valve closes. The remote air conditioning control device according to claim 1 or 2, characterized in that the valve is configured to close.