JPH0140027Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a power measuring device that measures the power of an internal combustion engine, and in particular uses a heat pump device as a load source for power measurement, and captures the energy of the measured power in the heat pump device and converts it into energy for heating and cooling. Concerning what you have come to use.

For example, in automobile factories and the like, power measurements are constantly performed to confirm the performance of manufactured internal combustion engines. This power measurement is performed, for example, as shown in FIG.
The power is measured by connecting the internal combustion engine 1 and applying a load commensurate with the power transmitted from the internal combustion engine 1 to the transmission shaft 2a of the dynamometer 2. 3 is a water tank for storing cooling water for cooling the internal combustion engine, 4 is a cooling water pipe, and 5 is an exhaust pipe.

However, the dynamometer 2 used for this power measurement
The dynamometer uses an absorption type dynamometer, which internally absorbs the energy of the transmitted power from the internal combustion engine 1, converts it into thermal energy, and releases it to the outside. The measuring power of Engine 1 was wasted.

On the other hand, as shown in FIG. 2, a heat pump device 6 driven by an internal combustion engine 1 has been used as a heating and cooling system for buildings, factories, etc. in many places in recent years. 7 is a compressor, 8
is a hot water tank.

This idea was made in view of the above circumstances.
A commonly used heat pump device is used as a power measurement load source in a dynamometer, and the measured power energy of the internal combustion engine is recovered by the heat pump device and used as energy for air conditioning, heating, hot water, etc., thereby making effective use of the measured power of the internal combustion engine. It is an object of the present invention to provide a power measuring device for an internal combustion engine as described above.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 3 showing the first embodiment, an output shaft 11a of an internal combustion engine 11 whose power is to be measured is connected to one side of a transmission shaft 13a of a dynamometer 13 via a coupling 12. A drive shaft 15a of a compressor 15 of a heat pump device 14 is connected to the other side of the transmission shaft 13a of the dynamometer 13 via a coupling 12.
The compressor 15 can be driven by the measured power of the internal combustion engine 11. In other words, the internal combustion engine 11
The compressor 15 acts as a load for the output of the motor, and this load is used as a power measurement load in the dynamometer 13.

The heat pump device 14, which serves as a load source for power measurement of the dynamometer 13, includes, in addition to the compressor 15, two types of heat exchangers 16 and 17, an expansion valve 18, a liquid receiver 19,
It has two four-way valves 20 and 21, which are connected by a refrigerant pipe 22. At the complete switching position of the four-way valves 20 and 21 (indicated by solid lines in FIG. 3), the refrigerant discharged from the compressor 15 is transferred from the heat exchanger 16 to the receiver 19, the expansion valve 18, and the heat exchanger 17. The air is circulated through the compressor 15 in order, and in this case, the air is warmed by heat exchange in the heat exchanger 16, which functions as a condenser, and is supplied into the building for heating. On the other hand, 4-way valve 2
When 0 and 21 are switched to other positions (indicated by broken lines in Figure 3), the refrigerant is transferred to heat exchanger 1, contrary to the case of heating.
7. The air is circulated to the compressor 15 via the liquid receiver 19, the expansion valve 18, and the heat exchanger 16 in order, and the air cooled by heat exchange in the heat exchanger 16, which functions as an evaporator in this case, is used inside the building. The air is supplied to the air conditioner for cooling. In addition, the water that is circulated and supplied to the heat exchanger 17 of the heat pump device 14 through the piping 23 is heated by heat exchange with the exhaust heat in the exhaust passage 11A of the internal combustion engine 11 and the water heat in the cooling water passage 11B. This enables heat exchange with hot water in the hot water storage tank 24, which allows the heat energy released by the internal combustion engine 11 to be recovered by the heat pump device 14, or the energy of the heat pump device 14 to be transferred to the hot water storage tank 2.
It has become possible to use energy extremely effectively by storing it in Note that 25 is a hot water user that uses hot water in the hot water storage tank 24.

According to this configuration, the power of the internal combustion engine 11 can be measured by the dynamometer 13, and at the same time, the power of the heat pump device 14 can be measured without wastefully consuming the energy of the power transmitted from the internal combustion engine 11. As a result, energy can be recovered as energy for heating and cooling the building and energy for hot water supply.

In addition, heat energy that was conventionally released as is, such as exhaust heat of the internal combustion engine 11 and cooling water heat, can be recovered as air-conditioning energy or hot water supply energy for the heat pump device 14, which is extremely effective for energy saving.

FIG. 4 shows another embodiment. This is intended to more effectively recover the measuring power of the internal combustion engine 11. In the figure, reference numerals 30 and 31 are load control means and rotation speed control means provided to keep the transmitted power and rotation speed of the internal combustion engine 11 constant, respectively. In addition, the thermal energy of the refrigerant discharged from the compressor of the heat pump device 14 is transferred to the hot water storage tank 24.
A heat exchange pipe 32 is provided for sending the heat to the heat exchanger.

That is, when measuring the power of the internal combustion engine 11, the transmitted power or rotational speed is usually kept constant. Therefore, in this case, the heat pump device 14 is always maintained in a constant operating state regardless of the required capacity (required load) of the heat pump device 14, and the heat pump device 14 There will be an excess or deficiency in their abilities.

However, according to the configuration of this embodiment, for example, when the required load of the heat pump device 14 is small relative to the set power of the internal combustion engine 11, a part of the thermal energy of the refrigerant discharged from the compressor 15 is transferred to the heat exchange piping. 32 to the hot water storage tank 24,
It can be used for heating inside 4.

Conversely, when the set power of the internal combustion engine 11 is insufficient for the required load of the heat pump device 14, that is, when there is insufficient cooling and heating, the amount of circulating water to the heat exchanger 17 of the heat pump device 14 is increased. This can compensate for the lack of heating and cooling. Therefore, the measured power of the internal combustion engine 11 can be used more effectively.

Furthermore, even if the internal combustion engine is surrounded by a soundproof member to reduce noise during power measurement, a cooling fan or the like used for cooling the internal combustion engine is not required, so the internal combustion engine 11, dynamometer 13, and The soundproofing member 33 that surrounds the compressor 15 of the heat pump device 14 does not require a ventilation port for the cooling fan, and in addition to the openings through which the piping passes, the radiant heat of the internal combustion engine and the frictional heat generated from the moving parts of the device are removed. Since it is only necessary to provide a ventilation hole 34 for the sound to be released, the soundproofing member 33
It is possible to improve the airtightness and sound insulation effect.

In the embodiment shown in Fig. 4, part of the thermal energy of the refrigerant is supplied to the hot water tank when the required load of the heat pump device is less than the set power of the internal combustion engine, but this is not limited to this. Needless to say, it may be provided and stored in the device.

As described above, according to the present invention, the energy of the measured power, which was conventionally only wasted when measuring the power of an internal combustion engine, can be recovered as energy for heating and cooling the heat pump device and energy for hot water supply at the same time as the power measurement. Therefore, it is extremely effective in terms of energy saving and economic efficiency.

[Brief explanation of the drawing]

Fig. 1 is a simplified diagram showing a conventional power measurement method, Fig. 2 is a simplified diagram showing a general heat pump drive system, Fig. 3 is a simplified configuration diagram showing one embodiment of the present invention, and Fig. 4 is a simplified diagram showing the present invention. FIG. 5 is a simplified configuration diagram showing still another embodiment of the present invention. 11... Internal combustion engine, 12... Coupling, 1
3...Dynamometer, 14...Heat pump device, 15
...Compressor, 16,17...Heat exchanger, 24...
Hot water tank.

Claims (1)

[Scope of utility model registration request] In a power measuring device for an internal combustion engine, the output shaft of an internal combustion engine is connected to a transmission shaft of a dynamometer, and a load commensurate with the power transmitted from the internal combustion engine is applied to the transmission shaft to measure the power of the internal combustion engine. an output shaft of the internal combustion engine is connected to one side of the transmission shaft, and
A compressor drive shaft of a commonly used heat pump device was connected to the other side of the transmission shaft, and the heat pump device was driven via the transmission shaft by the transmission power from the internal combustion engine, and the heat pump device was used as a load source for measuring the transmission power. A power measuring device for an internal combustion engine characterized by the following.