JPS60134164A - Engine driving type heat pump - 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 an engine-driven heat pump that uses a heat engine to drive a working fluid compressor used in a heat pump for heating and cooling.

(Prior Art) It has been considered that the working fluid compressor of a heat pump is driven by a heat engine. In this sustenance device, the engine,
The compressor and outdoor heat exchanger may be combined into one outdoor unit. in this case.

In order to reduce the noise of the outdoor unit, it is desirable to house the engine and compressor in a housing made of a material with excellent sound insulation.

On the other hand, if an electric motor is used as a power source, leakage of working fluid near the compressor will cause a negative impact on the motor even if the motor and compressor are housed in one sealed container.
There are few problems because the effects are small. However, when using a heat engine as a power source, if the working fluid leaking from the compressor is drawn into the engine along with the intake air, 1. No negative effect on the engine.

For example, when Freon is used as a working fluid, when this Freon gas gets mixed into the intake air, it burns in the combustion chamber and generates hydrogen chloride (HC, L), which along with blow-by gas enters the engine oil in the crankcase. Contaminants make the oil hostile. This causes a problem in that various parts of the engine, particularly iron parts such as cylinder liners, develop rust and accelerate wear.

(Object of the Invention) The present invention has been made in view of the above circumstances, and it is possible to solve the problem in the case that a working fluid compressor of a heat pump and a heat engine that drives this compressor are housed in one housing. It is an object of the present invention to provide an engine-driven heat pump in which even if working fluid leaks from a compressor, the gas of the working fluid is not sucked into an engine, and there is no possibility of adversely affecting the engine.

(Structure of the Invention) In order to achieve this object, the present invention includes a ventilation outlet for discharging ventilation inside the casing, and an engine intake port for introducing outside air into the engine from outside the casing, and exhausting air from the ventilation outlet. The air outlet is arranged at a position where the ventilation flow does not flow into the engine intake port.

(Example) The present invention will be described in detail below based on the drawings.

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of the outdoor unit. In these figures, numeral 10 is an engine that uses gas as fuel, 12 is a compressor driven by this engine 10, and these are housed in a casing 14 whose inner surface is covered with a sound insulating material such as glass wool. There is. The intake air of the engine 10 is taken from an engine intake port 16 that opens into the housing 14, and is passed through an intake silencer 1 inside the housing 14.
8゜Air cleaner 20. Engine 1 via mixer 22
Inhaled to 0. Gas as a fuel, for example city gas, is supplied to the mixer 22 via a pressure regulator 24,
A mixture of gas and air is generated in the mixer 22 and sucked into the engine 10.

26 is a four-way switching valve, 28 is an expansion valve, 30 is an indoor heat exchanger, and 32 is an outdoor heat exchanger, and these and the compressor 12 form a closed loop. This closed loop includes working fluid 8
For example, Freon is included. Each member except the indoor heat exchanger 30 is assembled to the casing 14 so as to form an outdoor unit together with the casing 14, as shown in FIG. Here, the outdoor heat exchanger 32 is placed on the upper part of the housing 14.

In FIG. 2, reference numeral 36 denotes a blower fan provided downstream of the outdoor heat exchanger 32 for cooling air.

In FIG. 2, reference numeral 38 denotes a ventilation inlet for introducing outside air into the housing 14, and is opened at the lower part of the side wall of the housing 14.

A ventilation outlet 40 opens between the external heat exchanger 32 and the blower fan 36. Note that this external heat exchanger 32
The fan 36 is provided so that the cooling air flows in a direction opposite to the engine intake port 16. Further, it is desirable to install silencers 42, 44, 46 at the ventilation inlet 38 and outlet 40 to prevent engine noise from leaking.

This device operates as follows. During cooling, the switching valve 26 is in the position shown by the solid line in FIG. 1, and the working fluid that has been compressed by the compressor 12 to a high temperature is.

After being cooled and liquefied in the outdoor heat exchanger 32, it passes through the expansion valve 28, becomes low pressure, and is vaporized in the indoor heat exchanger 30, removing indoor heat. Then, the cycle of being compressed again by the compressor 12 is repeated. 'Also, during heating, the switching valve 26 is switched to the position shown by the imaginary line in FIG. At this time, compressor 12
The compressed high-temperature working fluid warms the room in the indoor heat exchanger 30.

It passes through the expansion valve 28, becomes low pressure, and is vaporized and expanded in the outdoor heat exchanger 32, taking in heat from the outside air using the latent heat of vaporization at that time. This working fluid then returns to the compressor 12 and repeats the cycle northward.

Ventilation passing through the housing 14 is provided through a ventilation outlet 40. The air flows through the silencer 46 into the cooling air on the downstream side of the outdoor heat exchanger 32, and is caused by the fan 36 to flow to the left in FIG. 2, that is, in the direction opposite to the engine intake port 16. Therefore, there is no possibility that the ventilation flow exiting from the ventilation outlet 40 will flow into the engine intake port 16. That is, the compressor 1 is
Even if a small amount of working fluid leaks from the engine 10, there is no risk that gas from the leaked working fluid will be sucked into the engine 10.

Therefore, there is no fear that the working fluid will have any adverse effect on the engine 10.

In this embodiment, the ventilation outlet 40 is connected to the fan 36. Since the opening is made on the upstream side of the vent 36, the fan 36 has the effect of drawing out ventilation from the ventilation outlet 40.

Ventilation is promoted. Furthermore, since the working fluid gas contained in the air is diluted by the cooling air from the outdoor heat exchanger 32, even if the cooling air flows back to the engine intake port 16 side, the working fluid gas will not have an adverse effect on the engine 10. There is no risk of 4°.

In the present invention, the intended purpose can be achieved by arranging the ventilation outlet and the engine intake port so that the ventilation flow coming out from the ventilation outlet does not flow into the engine intake port, and the engine intake port 16 is used for outdoor heat exchange. 16A on the upstream side of the outdoor heat exchanger 32, and the ventilation outlet 40 may be provided on the downstream side of the outdoor heat exchanger 32. Further, the ventilation outlet may be opened in a wall surface 2 different from that of the engine intake port, for example, on the opposite wall surface.

(Effects of the Invention) As described above, in the present invention, since the ventilation outlet and the engine intake port are arranged in a position where the ventilation flow discharged from the ventilation outlet does not flow into the engine intake port, even if the compressor Even if the working fluid leaks, no working fluid gas will be drawn into the engine. Therefore, there is no risk of adverse effects on the engine, such as promoting rust formation inside the engine or accelerating wear.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of an outdoor unit. 10...Engine, 12...Compressor. 14... Housing, 16... Engine intake port. 40...Ventilation outlet. Patent Applicant Small Gas Cooling Technology Research Association Agent Patent Attorney Yama 1) Yu Fumi Figure 1 Figure 2

Claims (1)

[Claims] In an engine-driven heat pump in which a working fluid compressor of the heat pump and a heat engine that drives the compressor are housed in one housing, there is provided a ventilation outlet for discharging the ventilation inside the housing, and a ventilation outlet for discharging the ventilation inside the housing, and a ventilation outlet for discharging the ventilation from the outside of the housing. an engine intake port that introduces outside air into the engine, and the ventilation discharge port is located at a position where the airflow discharged from the ventilation discharge port does not flow into the engine intake port. .