JPS584254B2 - remote air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of adjusting the capacity of each terminal unit itself and controlling each of the cold/heat source unit and circulation unit by opening and closing the circulation flow path opening/closing valve provided at each terminal unit in a cold/hot water type central air conditioner. It is an object of the present invention to provide a device for remotely controlling heat supply means for a 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.

This method requires complicated electrical wiring work.

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

(c) It had disadvantages such as being expensive as a result.

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 circulator that circulates thermal fluid in this piping, and changes its position in response to the circulating flow rate. In addition, a backflow prevention means for bringing the valve body into close contact with the valve seat when the flow is stopped is provided in the discharge side circulation circuit near the circulator, and the hot fluid before passing through the valve body is removed from between the valve body and the valve seat facing the valve seat. A bypass circuit is provided to return to the suction side circuit of the circulator, and at least the circulator is activated by detecting pressure fluctuations in the fluid holding path formed between the circulation path opening/closing valve provided in each terminal unit and the backflow prevention means. It is equipped with a pressure detection means that automatically starts and stops.

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.

The hot water generated in the running water boiler 1 is sent to each terminal unit 4, 5, via the flow rate distribution branch headers 3a, 3b by the circulation pump 2.
6 and performs heating.

A backflow prevention means 7 is provided in the discharge side circulation circuit near the circulation pump 2, and the valve body is brought into close contact with the valve seat to perform a backflow prevention function. A bypass path 8 for returning to the suction side circuit of No. 2 is branched, and a bypass control valve 9 is inserted in this bypass path 8, and a bypass control valve 9 is inserted between the backflow prevention means 7 and the circulation path opening/closing valves 10, 11, etc. of each terminal device. The power source 1 of the heat supply means such as the circulation pump 2 and the combustion control device 14 is detected by the pressure detection means 13 that detects the internal pressure fluctuation of the fluid holding path 12 formed in the
5, and enables automatic remote control of the boiler 1 and circulation pump 2 in conjunction with the opening and closing operations of the on-off valves provided at each terminal.

The opening/closing valve of the terminal may be an electric valve 10 or a manual opening/closing valve 11 which is opened and closed in conjunction with a blower fan 17 by an operation switch 16.

In FIG. 1, reference numeral 18 indicates a heat exchanger for the terminal, and reference numeral 19 indicates a water supply tank for thermal fluid in the circulation circuit.

Next, the main components of the present invention are the backflow prevention means 7, the bypass passage 8, the bypass control valve 9, and the pressure detection means 13.
A specific configuration explanation of the control unit 20 consisting of the following will be given.

In FIG. 2, an inlet 21 and an outlet 2 of the control unit are shown.
Valve body 2 whose position changes according to the flow of circulating thermal fluid during 2.
3 is biased in the closing direction by a spring 24.

A buffer material 25 made of a plastic material is attached to the side of the valve body 23, and allows the valve body 23 to slide and displace smoothly.

A key groove-shaped fluid passage 26 is provided in the valve wall of the sliding portion, and by lightly abutting the buffer material 25 against the valve wall,
Improves low flow rate detection performance.

In addition, a check packing 27 is attached to the lower part of the valve body 23 so that the valve body 23 comes into close contact with the valve seat 28 when the circulation pump 2 is stopped.
is configured to also act as a check valve.

When the valve body 23 is opened, a bypass path 29 is branched between the valve body 23 and the valve seat 28 for returning the circulating thermal fluid before passing through the valve body 23 to the suction side circuit of the circulation pump 2.

A first diaphragm 3 introduces and detects the discharge pressure of the circulation pump 2 into this bypass passage 29 from a pressure transmission pipe 30.
1 and a second diaphragm 32 that detects the differential pressure between the discharge pressure and the suction pressure.
Interpose.

The opening pressure setting of this bypass control valve 33 is set by adjusting screw 3.
4, the strength of the spring 35 can be adjusted as desired.

Furthermore, if the pressure detection means 13 is a differential pressure detection device 36 as shown in FIG. 3, even if the circulation circuit is a closed circuit and the thermal fluid expands in volume due to temperature rise, etc., and the entire circuit internal pressure fluctuates. Relative pressure changes in the fluid holding path can be detected, making it free from malfunctions.

The internal pressure of the fluid holding path is introduced into the high pressure chamber 39 formed by the diaphragm 38 through the pressure transmission pipe 37 from the bypass control valve described above, and the pressure inside the fluid retention path is introduced into the low pressure chamber through the pressure transmission pipe 40 from the bypass path communicating with the circulation pump suction side path. The internal pressure of the circulation pump suction side path is introduced into 41, and the pressure difference causes the diaphragm 38 to
The microswitch 43 for starting and stopping the circulation pump is opened and closed via the connecting rod 42.

44 is a seal ring.

Further, 45 is a spring that displaces the diaphragm 38 upward to close the microswitch 43 when the differential pressure disappears.

The operation of this control unit will be explained next.

FIG. 6 is an explanatory diagram of the operation of the circulation pump, with the vertical axis representing the differential pressure and the horizontal axis representing the circulating flow rate. First, when the on-off valve of the terminal installed on the indoor side is opened, the diaphragm 38 is displaced upward, and when the differential pressure reaches H1, the circulation pump start/stop microswitch 43 is turned on to start and operate the circulation pump.

Further, the position of the valve body 23 changes as shown in FIG. 5 with respect to the circulating flow rate.

When the differential pressure becomes H2 or more, the bypass control valve 33 is opened, and even if the number of radiators used changes and the flow rate of the radiator side circulation circuit changes, the presence of the bypass circuit allows the circulation to continue. The pump discharge pressure can be kept almost constant.

When the opening/closing valve of the last terminal unit is closed, the valve body 23, which had been pushed upward by the circulating thermal fluid, gradually descends due to the force of the spring 24, and the circulating flow rate reaches Q1.
When reaching this point, the check packing 27 of the valve body 23 comes close to the valve seat 28, and the bypass passage 29 is also narrowed.

Therefore, the second diaphragm 3 of the bypass control valve 33
2, the suction pressure of the circulation pump 2 acts as a closing force, and the bypass control valve 33 is closed.

Then, the discharge pressure and suction pressure of the circulation pump are applied before and after the diaphragm 38 of the differential pressure detection device 36, and eventually the differential pressure tends to reach H4 corresponding to the cut-off head of the circulation pump.

Taking advantage of this sudden increase in differential pressure, the differential pressure increases to H3.
When this happens, stop the circulation pump.

When the circulation pump 2 stops, the valve body 23 receives back pressure and functions as a check valve, forming a fluid holding path between the valve body and the opening/closing valve of the terminal device, which maintains a high pressure close to the discharge pressure of the circulation pump.

The circulation pump will stop until the differential pressure decreases again.

Another embodiment of the valve body structure that changes its position in response to circulating flow and performs a backflow prevention function will be described with reference to FIG. 4.

A movable valve seat 48 made of a plastic material or the like is provided between the inflow port 46 and the outflow port 47, the outer periphery of which is fixed to the frame wall, and the center of which is open. The valve seat 48 is brought into contact with the valve seat 48 by the action of a spring 50 and its position is changed.

A thin fluid passage 51 is cut out and provided in the valve portion of the valve body 49 that abuts the movable valve seat 48, and when the circulating flow is stopped, a check packing 52 attached to the central portion of the valve body is attached to the movable valve seat. The valve seat 53 is placed in close contact with a fixed valve seat 53 provided separately to perform a backflow prevention function, and a branching portion of the bypass path 54 is provided upstream of the movable valve seat 48 and downstream from the fixed valve seat 53. It is something.

55 indicates a pressure transmission pipe to the bypass control valve.

Since the control operation is the same as that of the first embodiment described above, a description thereof will be omitted.

As described above, the present invention detects the differential pressure fluctuation between the fluid holding path and other paths due to the opening of the on-off valve provided in the terminal unit, starts the circulation pump, etc., and starts the circulation pump etc. as the on-off valve is opened. Detects the decrease in flow rate as the displacement of the valve body,
In this way, by increasing the bypass resistance, changes in flow are indirectly detected by replacing them with changes in differential pressure, and remote control operation is realized in which the circulation pump and the like are stopped.

The present invention provides the following effects.

(i) It is possible to remotely and individually control the cooling and heat source equipment and the heat supply power source of the circulation pump from each terminal without complicated electrical wiring or laborious wiring work.

(ii) When not in use, the flow path opening/closing valve provided in the terminal is closed, so as a result, no hot fluid is circulated in the terminal circulation circuit, preventing piping heat loss and achieving energy-saving control. realizable.

(iii) Start-up operation is performed by detecting differential pressure fluctuations, and stop control is performed by detecting a circulating rheometer, and the initial set pressure,
It is possible to obtain a control means that can be applied to all types of cold/hot water type central air conditioners without being affected by fluctuations in circuit internal pressure due to temperature changes, variations in head performance due to the size of circulation pump capacity, etc.

(iv) Since a bypass path with a control valve is provided,
A pump characteristic of constant circulation head is obtained, and even if the number of terminals used changes, the circulation flow rate of the terminals in use does not change much, and a constant output can be maintained, making it easy to use.

(v) It becomes a compact control unit with less water leakage, etc., is low cost, and can be easily integrated into a unit with a cold/heat source equipment, etc.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the present invention, Fig. 2 is a first cross-sectional view of the control unit, Fig. 3 is a cross-sectional view when a differential pressure detection means is added to the first embodiment, and Fig. Figure 4 is a partial sectional view showing the second implementation configuration of the check valve section, Figure 5 is a relationship between the valve body displacement amount of the control unit and the circulation flow rate, and Figure 6 is a circulation head characteristic diagram of the circulation pump. be. 1...Cold heat source equipment (hot water boiler), 2...Circulation pump, 4, 5, 6...Terminal unit, 8, 29, 54...Bypass path, 9, 33...Bypass control valve , 10, 1
DESCRIPTION OF SYMBOLS 1... Circulation flow path opening/closing valve, 12... Fluid holding path, 13... Pressure detection means, 23, 49... Valve body, 2
5...Buffer material.

Claims (1)

[Claims] 1. A cold source device and a terminal device such as a heat radiator are separated and connected via piping, and a circulator for circulating thermal fluid is provided in this piping, and the position changes in response to the circulating flow rate, and when the flow stops, the valve body is closed. A backflow prevention means that is brought into close contact with the valve seat is provided in the discharge side circulation circuit near the circulator, and the hot fluid before passing through the valve body is transferred from between the valve body and the opposing valve seat to the suction side circuit of the circulator. A bypass circuit for returning the circuit is provided, and a bypass control valve is provided, in which a first diaphragm for detecting the discharge pressure of the circulator and a second diaphragm for detecting the differential pressure between the discharge pressure and the suction pressure are integrally connected. A remote controller provided with a pressure detection means installed in the circuit and automatically starts and stops at least the circulation machine by detecting pressure fluctuations in a fluid holding path formed between the circulation path opening/closing valve provided in each terminal unit and the backflow prevention means. Air conditioning control equipment.