JPS6237655A - Gas engine heat-pump hot-water supply machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water heater using a gas engine heat pump.

[Conventional technology]

A gas engine heat pump water heater generally consists of a hot water storage tank, a heating section, and a remote control section. By issuing a predetermined instruction from the remote control section, the gas engine heat pump installed in the heating section is operated, and the water inside the hot water storage tank is operated. It converts water into hot water. Here, the gas engine refers to an engine that is driven using city gas, LP gas, or the like as fuel.

By the way, gas engine heat pump water heaters generally have greater vibration and noise than motor-driven heat pump water heaters and the like. The magnitude of vibration and noise is related to the rotational speed of the gas engine; the higher the rotational speed, the thicker the vibration and noise, and the lower the rotational speed, the smaller the vibration and noise.

On the other hand, the higher the rotational speed of the gas engine, the faster the water will boil.

Therefore, conventionally, the rotational speed of the gas engine has been set to be the highest rotational speed within a range where vibration and noise are not a problem.

[Problem that the invention seeks to solve]

However, from the standpoint of actual usability, there are few cases where you want to boil water faster than the conventional method.

[Means for solving problems]

The present invention has been made in view of the above problems, and the level of problematic vibrations and noises is not necessarily constant throughout the cycle of the day, and even if the vibrations and noises during the day are somewhat higher than those at night, they are still problematic. Target rotational speed setting means for setting a target rotational speed of the gas engine according to an external input, and a fuel provided in the gas engine based on a signal from the target rotational speed setting means. and governor control means for adjusting the supply governor.

[Effect]

If the target rotation speed is set high, the boiling time will be shortened.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

FIG. 1 is a configuration diagram showing an embodiment of a gas engine heat pump water heater to which the present invention is applied, and shows a hot water storage tank 1. It is composed of a heating section 2 and a remote control section 3.

A water supply pipe 4 is attached to the lower part of the side wall of the hot water storage tank l, and a hot water supply valve 5 is attached to the upper part of the side wall.

Further, one end of a heat exchange water circuit 6 passing through the heating section 2 is attached to the lower side wall of the hot water storage tank 1 via a pump 30, and the other end of this heat exchange water circuit 6 is attached to the upper end of the hot water storage tank 1. It has reached this point. The pump 30 pumps up water from the lower part of the hot water storage tank 1 in conjunction with the driving of the heating part 2, and further transfers it to the upper part of the hot water storage tank 1 through the heating part 2. The inside of the hot water storage tank 1 is filled with hot water and cold water separated into upper and lower layers, and the hot water in the upper layer is the cold water in the lower layer heated by the heating unit 2 through the heat exchange water circuit 6. When the hot water supply valve 5 is opened, hot water flows out and the same amount of water is replenished from the water supply vibrator 4. Therefore, the interface between hot water and cold water is determined by the drive of the heating unit 2 (i.e., the pump 30). drive)
and rises and falls due to the outflow of hot water from the hot water supply valve 5.

Hot water temperature sensors 7a to 7e are arranged vertically on the side wall of the hot water storage tank 1, and the output signal line of each sensor extends to hot water amount detection means, which will be described later.

The heating section 2 includes a heat pump 13. It has a built-in gas engine 14 and an electronic control section 15.

The heat pump 13 is a compressor 8. Refrigerant hot water heat exchanger9. Expansion valve 10. Air heat exchangers 11 are connected by piping 12 and a refrigerant is sealed inside. The refrigerant sucked into the compressor 8 becomes high-temperature, high-pressure gas here and passes through the refrigerant hot water heat exchanger 9.
sent to. In the refrigerant hot water heat exchanger 9, heat is released to the heat exchange water circuit 6 and the refrigerant is liquefied. The liquefied refrigerant is sent to the expansion valve 10, where it is depressurized and becomes easily evaporated. Then, in the air heat exchanger 11, heat of evaporation is taken away from the outside world, and the gas changes into a gas, which is compressed again in the compressor 8. The heat pump 13 heats the water flowing in the heat exchange water circuit 6 in the refrigerant hot water heat exchanger 9 by continuously repeating the above cycle.

The compressor 8 is driven by a gas engine 14, and the electronic control section 15 controls the operation/stop and rotational speed of the gas engine 14. The rotation speed is controlled by adjusting the electronic governor 20.

The electronic control section 15 is composed of a microcomputer having a CPU, a storage section, and an interface section, and when the inside is divided into functional blocks, there are gas engine control means 16,
It can be divided into hot water amount detection means 17, target rotation speed setting means 18, and governor control means 19.

The hot water amount detection means 17 is means for detecting the position of the interface between hot water (hot water) and cold water, that is, the amount of hot water, based on data from the hot water temperature sensors 7a to 7e, and outputs the result to the gas engine control means 16. For example, if the output temperature data of the hot water temperature sensor 7b is high and the output temperature data of the hot water temperature sensor 7c is low, it can be seen that there is an interface between hot water and cold water between the hot water temperature sensors 7b and 70.

The gas engine control means 16 controls the operation and stopping of the gas engine 14 based on signals from the hot water amount detection means 17 and a remote control section 3, which will be described later.

Further, the target rotational speed setting means 18 is means for setting the target rotational speed of the gas engine 14 based on a signal from the remote control section 3, and the governor control means 19 is a means for setting the target rotational speed of the gas engine 14 based on a signal from the remote control section 3.
The electronic governor 20 is adjusted so that the controller 4 is driven at the rotational speed set by the target rotational speed setting means 18.

In addition to the operation switch, the remote control unit 3 is provided with a boiling speed selection switch and notch.The operation switch is a switch that instructs the gas engine 14 to start or stop, and the boiling speed selection switch is a switch that instructs the boiling speed to be slow or slow. This is a switch to select the emergency.

Next, the operation of this embodiment will be explained with reference to the flowchart of the electronic control section 15 shown in FIG. First, the on/off state of the operation switch in the remote control unit 3 is determined (determination 101). If the operation switch is on, the process then proceeds to judgment 102, in which the gas engine control means 16 judges the state of the boiling speed selection switch in the remote control unit 3. If the boiling speed "Rapid" is selected, the target rotation speed of the gas engine 14 is set to a high speed rotation of 2000 rpm or more (process 103), and if "Slow" is selected, the target rotation speed is set to a low speed rotation of around 1500 rpm (process 103). 104
). Once the target speed of the engine is set, the process proceeds to decision 105, where it is determined whether the hot water storage tank 1 is full. As already mentioned, the determination as to whether the tank is full or not is made based on the signal from the hot water amount detection means 17. If the tank is not full, the process proceeds to judgment 106, where it is confirmed that there is no abnormality based on signals from various sensors (not shown), and if there is no abnormality, the gas engine 14 is processed 103 or 104.
Control operation is performed at the target rotation speed set in step 107.
). Note that if it is determined in judgments 101, 105 or 106 that the operation switch is off, the tank is full, or there is an abnormality, the gas engine 14 is stopped (process 108).

FIGS. 3(A) and 3(B) respectively show the gas engine 14.
This is a timing chart showing the operation and the amount of hot water in the hot water storage tank 1 associated with the operation, where the broken line indicates the case where the boiling speed selection switch is set to ``sudden'', and the solid line indicates the case when ``slow'' is selected.

From the same figure, in the case of "sudden", it is about two-thirds of the case in "slow".
It can be seen that the hot water in the hot water storage tank 1 can be filled up in the time of . However, in the case of an emergency, the gas engine 1
Since the vibration and noise generated in step 4 will increase somewhat, it is desirable to use the vehicle in such a way that the vehicle is normally operated at "slow" mode, and if necessary, the mode is set at "fast" mode.

〔Effect of the invention〕

As explained above, according to the present invention, since the fuel supply governor is adjusted based on the signal from the target rotation speed setting means, the target rotation speed in the target rotation speed setting means can be set as high as necessary. This can shorten the boiling time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart of the electronic control section 15, and FIG. 3 is a timing chart showing the engine speed and the amount of hot water. 1...Hot water storage tank, 13...Heat pump, 14.
...Gas engine, 15...Electronic control section, 16...
Gas engine control means, 17... Hot water amount detection means, 18
. . . target rotational speed setting means; 19 . . . governor control means;

Claims (1)

[Claims] In a gas engine heat pump water heater that drives a heat pump with a gas engine to convert water in a hot water storage tank into hot water, the target rotation speed setting means sets a target rotation speed of the gas engine according to an external input; A gas engine heat pump water heater, comprising: a governor control means for adjusting a fuel supply governor provided in the gas engine based on a signal from a speed setting means.