JPH0410487Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a system that supplies heat to each dwelling unit using a heat medium circulating within a building.

[Prior art and its problems] A problem with systems that supply heat to high-rise apartment complexes, offices, etc. by using a heat medium circulating in a circulation circuit piped inside the building is the pressure of the heat medium. It is control. In other words, in the case of high-rise buildings, the circulation circuit (piping) becomes long, so when the load increases, the pressure loss becomes extremely large, and the pressure (differential pressure) at the end house becomes low, causing heat dissipation inside the house. The exchange (supply of heat) is not carried out sufficiently, leading to problems such as a drop in the temperature of hot water and, in the case of a bath, a long time required to heat the water.

On the other hand, when the load decreases and the pressure (differential pressure) at the end increases, corrosion of the heat exchanger in the house progresses, and problems arise such as noise generation when excess heat medium passes through the bypass valve. do.

Therefore, conventionally, as shown in Fig. 6, the circulation circuit 0
Pressure detector (pressure transmitter) 02 at pressure detection point 1
is installed, this pressure detector 02 detects the control pressure or control differential pressure, and upon receiving this detection signal, the controller 03 converts it into an inverter frequency command signal and transmits it to the inverter 04 to variably control the pump 05. . 06 is a heat source.

However, in this case, there is a problem that the pressure detector 02 and the controller 03 are expensive and require maintenance.

[Purpose of the present invention] The purpose of the present invention is to propose a control device that is inexpensive and requires little maintenance in a heat supply system for a high-rise apartment complex.

[Configuration of the present invention and its operation] The present invention proposes a control device having the following configuration to achieve the above object.

A plurality of pumps or blowers using inverters are installed in the heating medium circulation circuit, and a pressure gauge with two contacts is installed at a pressure detection point in the heating medium circulation circuit, and an upper limit contact signal is input from the pressure gauge with two contacts. When this happens, the number of rotations of the pump or blower is reduced, and when this number of rotations reaches the lower limit, the number of units in operation is reduced.
A heat supply system for high-rise residential buildings, etc., which is equipped with a controller that increases the rotation speed of a pump or blower when a lower limit contact signal is input, and outputs a signal to increase the number of units in operation when the rotation speed reaches the upper limit value. Control device.

In the above-mentioned control device, when the control pressure detected by the two-point contact pressure gauge is an upper limit contact signal, the controller receives this signal and controls the inverter frequency to decrease, thereby reducing the rotation speed of the pump. Then, when this rotation speed reaches the lower limit value, the number of operating machines is reduced.

On the other hand, if the detected control pressure is a lower limit contact signal, the controller receives this signal and controls the inverter frequency to increase, thereby increasing the rotation speed of the pump. Then, when this rotation speed reaches the upper limit value, the number of operating units is increased.

The features of the configuration of the present invention are as follows.

Pump or blower: Controls the rotation speed using an inverter and sets upper and lower limits for this rotation speed.

Pressure detector: Sends a signal when it detects the upper or lower set pressure.

Controller: When receiving the upper limit signal, it first issues a signal to decrease the number of rotations, and when this number of rotations reaches the lower limit, it issues a signal to reduce the number of operating units.When it receives the lower limit signal, it first issues a signal to increase the number of rotations, and then When the upper limit is reached, a signal is issued to increase the number of vehicles in operation.

[Embodiment and its operation] FIG. 1 shows an embodiment of the above-mentioned present invention.
1 is a heat medium circulation circuit, 2 is three circulation pumps attached to the heat medium circulation circuit 1, and the rotation speed of these pumps can be controlled by an inverter 3.

4 is a heat medium heating circuit, and a heat medium heating body heated by a heat source device 5 is circulated in this heat medium heating circuit 4 by a pump 6 while giving heat to the heat medium by a heat exchanger 7.

In the embodiment, the heat medium circulation circuit 1 and the heat medium heating circuit 4 were separated because the static pressure of the heat medium (water) in the heat medium circulation circuit 1 became extremely high.
This takes into consideration the fact that the withstand voltage is higher than that of .

8 is a pressure gauge with two contacts attached to the end of the circuit 1 to detect the pressure or differential pressure inside the heat medium circulation circuit 1, and 9 is a controller, and this controller 9 sends the following control signals to the inverter. Issued on 3.

a When the two-contact pressure gauge 8 detects the upper limit of the set pressure, it receives this signal and outputs a signal to the inverter 3 to reduce the number of rotations, and when the number of rotations reaches the lower limit, it outputs a signal to reduce the number of operating units.

b When the two-contact pressure gauge 8 detects the lower limit of the set pressure, it receives this signal and outputs a signal to increase the number of rotations to the inverter 3, and when this number of rotations reaches the upper limit, it outputs a signal to increase the number of operating units.

In the figure, numeral 10 is a load, and 11 is a minimum flow circuit.

FIG. 2 is a block diagram of the controller 9. When the upper limit pressure signal H is input, it starts counting down, and when the lower limit signal L is input, it starts counting up, and converts the count value into a D/A. This value is output as a command value for the inverter 3.

FIG. 3 shows control data using the control device according to the above embodiment.

FIG. 4 shows another embodiment of the controller 9,
In this case, the rotation speed is gradually reduced when the upper limit contact signal is input, the rotation speed is quickly increased when the lower limit contact signal is input, and when neither of these is the case, the rotation speed is slowly decreased. be.
FIG. 5 shows control data using this controller 9.

[Effects of the present invention] As described above, the present invention uses a pressure gauge with two contacts,
By controlling the inverter and the number of operating units using the controller based on the input from the pressure gauge, the pressure at the terminal of the heat medium circulation circuit can be controlled within a certain range.

In particular, the present invention uses a pressure gauge with two contacts and a controller that performs control using the upper and lower limit contact signals as input, so the cost is low, there is almost no need for maintenance, and a highly reliable control device is used. There are effects that can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the heat supply system and its control device in a high-rise apartment complex, etc. according to the present invention, and Figure 2
The figure is an explanatory diagram of the controller, Figure 3 is a data diagram,
FIG. 4 is a diagram of another embodiment of the controller, FIG. 5 is a data diagram when the controller of FIG. 4 is used, and FIG. 6 is an explanatory diagram of a conventional heat supply system and its control device. 1... Heat medium circulation circuit, 2... Circulation pump, 3
... Inverter, 4 ... Heat medium heating circuit, 5 ... Heat source machine, 6 ... Pump, 7 ... Heat exchanger, 8 ... Pressure gauge with two contacts, 9 ... Controller.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of pumps or blowers using inverters are installed in the heating medium circulation circuit, and a pressure gauge with two contacts is installed at a pressure detection point in the heating medium circulation circuit, When the upper limit contact signal is input from the pressure gauge with contacts, the rotation speed of the pump or blower is reduced, when this rotation speed reaches the lower limit value, the number of operating units is reduced, and when the lower limit contact signal is input, the rotation of the pump or blower is reduced. A control device for a heat supply system in a high-rise residential building, etc., which is equipped with a controller that outputs a signal to increase the number of units in operation when the number of rotations reaches an upper limit. (2) In the controller, when the upper limit contact signal is input, the rotation speed is promptly decreased, when the lower limit contact signal is input, the rotation speed is promptly increased, and if neither of these conditions occurs, the rotation speed is slowly decreased. A control device for a heat supply system in a super high-rise apartment complex, etc., as set forth in claim 1 of the utility model registration claim.