JPH0552502U - Unit control device for vacuum hot water boilers - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] When controlling multiple vacuum hot water boilers, prevent abnormalities from occurring in combustion control of the hot water boilers themselves, and cope with load fluctuations. Is also the supply of a vacuum hot water boiler unit controller that stabilizes the supply temperature. [Configuration] A plurality of vacuum hot waters are connected in parallel to the supply pipe 7 to the heat load 6 and the return pipe 8, a pump is provided in the middle of the return pipe 8, and branch pipes from the return pipe to each boiler are provided. The electromagnetic on-off valve 2 is provided in the middle of the supply line, the temperature detection device 3 is installed in the middle of the supply pipe, and the electromagnetic on-off valve installed in the middle of the branch pipe due to the difference between the detected value from the temperature detection device and the set value. Heat load 6 by controlling the number of open / close of 2
To control the number of hot water boilers.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a number-of-units control device that supplies optimum heat quantity in response to load fluctuations by controlling water supply in a system in which multiple vacuum boilers are installed.

[0002]

[Prior Art]

 Vacuum hot water boilers usually have a combustion chamber inside the main body of the boiler, heat transfer water and a heat exchanger inside a vacuum sealed container, and water is passed through the heat exchanger to obtain hot water. Because of this method, combustion control is performed by the temperature of the heat transfer water, so that there is a difference in the temperature difference between the temperature of the hot water at the heat exchanger outlet and the temperature of the heat transfer water, and in the tracking of the temperature. As a conventional method for controlling the number of hot water boilers with multiple units installed, a temperature detection device was installed in the water supply pipe, and the operating number of hot water boilers was controlled according to the temperature difference between the detected temperature and the set temperature. There is something. When the combustion control of each vacuum hot water boiler is controlled by the temperature of the collecting pipe at the outlet of each vacuum hot water boiler heat exchanger, if the temperature of the collecting pipe is lower than the set value, the heat transfer water temperature is allowable. Even if the temperature exceeds the temperature, a signal that the combustion device is ON may be output to the boiler. As a result, the safety device may operate and cause an abnormal stop.

[0003]

[Problems to be solved by the device]

 In the present invention, when controlling the number of multiple vacuum hot water boilers whose combustion is controlled by the temperature of the heat transfer water, it is possible to prevent abnormalities from occurring in the combustion control of the hot water boiler itself, and to further reduce the load. This is the supply of a vacuum hot water boiler unit control device that stabilizes the supply temperature even in response to fluctuations.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, multiple vacuum hot water units are connected in parallel to the heat load supply pipe and the return pipe, a pump is installed in the middle of the return pipe, and the return pipe connects each boiler to each boiler. An electromagnetic on-off valve is installed in the middle of the branch pipe, a temperature detection device is installed in the supply pipe, and the electromagnetic on-off valve installed in the middle of the branch pipe due to the difference between the detected value from the temperature detection device and the set value. The number of hot water boilers to the heat load is controlled by controlling the number of open / close of.

[0005]

[Action]

 By controlling the number of solenoid valves attached to the branch pipes for the supply of multiple boilers installed in parallel with the heat load supply pipes and return pipes, the hot water boilers whose supply was stopped by the solenoid valves are The temperature of the medium water rises and the combustion is stopped automatically, so there is no abnormal stoppage due to the extreme rise in the temperature of the heat medium water. Usually, the load of hot water is often due to the amount of hot water used.When the heat load is small, the circulation flow rate is decreased, and when the heat load is large, the circulation flow rate is increased. A stable water supply temperature can be obtained.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a plurality of vacuum hot water boilers (1) are installed in parallel with the supply pipe (7) to the heat load (6) and the return pipe (8) via branch pipes. A circulation pump (5) is installed in the middle of the return pipe (8) from the heat load (6), and an on-off valve (2) of electromagnetic opening or mechanical drive is installed in the middle of the branch pipe from the return pipe (8). The on-off valve (2) is electrically or mechanically connected to the control device, and opens and closes the on-off valve (2) according to a signal from the control device (4). A temperature detector (3) is installed in the middle of the supply pipe from the hot water boiler, the detector (3) and the controller (4) are electrically or mechanically connected, and the measured value is the controller ( Tell 4).

The control device can set the temperature of the supply pipe to a predetermined value, and as shown in FIG. 2, the temperature difference between the temperature from the temperature measuring device installed in the supply pipe and the set value can be set. The number of valves is determined, an open signal is output to a predetermined open / close valve, and the open / close valves are opened / closed. In this case, the open time of each open / close valve is integrated so that the operating time of each vacuum hot water boiler is constant, and when the open / close signal is output to the open / close valve, the open times are compared and If you open the valve with the shorter time or close the open / close valve with the longer time, the overall operating time will be uniform. FIG. 3 is a block diagram showing an outline of control of the control circuit.

[0008]

[Effect of the device]

 By implementing the present invention, each vacuum hot water boiler can be operated with high efficiency, so that the efficiency can be improved as a whole. By combining a simple control device, it is possible to manage the operation time as a whole, and the operating time of each boiler can be made uniform, thus improving the service life.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the configuration when three hot water boilers according to an embodiment of the present invention are installed.

FIG. 2 is an explanatory view of an embodiment of the number control of the present invention.

FIG. 3 is a control schematic block diagram of a control circuit according to an embodiment of the present invention.

[Explanation of symbols]

 1 Vacuum hot water boiler main body 2 Electromagnetic on-off valve 3 Temperature detection device 4 Control device 5 Circulation pump 6 Heat load 7 Supply pipe 8 Return pipe

Claims (1)

[Scope of utility model registration request] 1. A plurality of vacuum hot water boilers are connected in parallel to a supply pipe to a heat load and a return pipe from the heat load by connecting the respective pipes in parallel, and a temperature detecting device is provided in the middle of the pipes.
A pump is provided in the middle of the return pipe, an opening / closing valve is provided in the middle of the branch pipe from the return pipe to each boiler, and the temperature controller and the controller that electrically or mechanically connects the opening / closing valve are A controller for controlling the number of vacuum hot water boilers, characterized in that the number of opening / closing valves installed on the way from the return pipe to the boiler is controlled by the temperature difference between the signal and a predetermined set value.