JPH0332942Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a heat pump device used in heating and cooling systems for houses and buildings, and in particular, a heat pump in which a compressor for pressurizing refrigerant in a heat pump circuit is driven by an engine. Regarding equipment.

(Prior Art) Various heat pump devices having a configuration in which a refrigerant pressurizing compressor is driven by an output shaft of an engine have been proposed, for example, as shown in Japanese Utility Model Application No. 59-23070. By the way, in such a conventional heat pump device, when a heat medium obtained by recovering engine exhaust heat is used as a heat source on the heat pump circuit side, it is necessary to provide a heat exchanger in the engine exhaust system to exchange heat between the exhaust gas and the heat medium. be.

Incidentally, engine-related parts such as this heat exchanger are installed in the engine, but such heat exchangers generally have a relatively large shape in order to avoid high exhaust resistance.

However, in a normal vehicle engine, large parts other than the exhaust manifold are not installed as part of the exhaust system. Without increasing the overall height or width,
In order to mount the above-mentioned heat exchanger on an engine, it is necessary to devise the arrangement and mounting configuration of the heat exchanger.

(Purpose of the invention) The present invention is in response to the above-mentioned request, and allows the engine to be used without major changes when installing an exhaust heat recovery heat exchanger on the engine. Without increasing the overall height or width,
It is an object of the present invention to provide an engine-driven heat pump device that can be laid out easily, and furthermore, the passage between the exhaust manifold and the heat exchanger for exhaust heat recovery can be shortened, and the whole can be made significantly compact. purpose.

(Structure of the invention) The present invention is an engine-driven heat pump device in which a refrigerant pressurizing compressor in a heat pump circuit is driven by an engine. A compressor connecting portion for driving the compressor is provided on the side, and the compressor is disposed on the one end side of the compressor connecting portion, and
An exhaust heat recovery heat exchanger for exchanging heat between the engine exhaust and the heat medium is installed above the compressor connection between the engine and the compressor.
The exhaust manifold is arranged so that its longitudinal direction is perpendicular to the output shaft when viewed from above the engine, and the exhaust manifold is arranged so as to extend in the direction of the engine output shaft along the cylinder row, and at the downstream end of the exhaust collecting part. is located near the end of the engine on the exhaust heat recovery heat exchanger side, and the exhaust gas inlet at the longitudinal end of the exhaust heat recovery heat exchanger is viewed from the engine output shaft direction. It is installed on the exhaust manifold side.

(Embodiment) First, the entire system according to an embodiment of the present invention will be explained with reference to FIG. 7. The heat pump unit side system A includes a refrigerant pressurizing compressor 1
, indoor heat exchanger 2 , four-way valve 3 , and expansion valve 4
A heat pump refrigerant circuit 6 consisting of an outdoor heat exchanger (heat load) 5 is provided, and a heat radiation fan 7 for the outdoor heat exchanger 5 and a heat exchanger 10 described below is provided. On the other hand, the engine side system B is provided with an engine 8 equipped with a compressor connecting portion 8a at one end of the output shaft that drives the compressor 1, and recovers the exhaust heat of the engine 8 and converts the recovered heat into heat. A cooling water passage 9 is provided for dissipating heat in the exchanger 10 and cooling the engine.

The cooling water passage 9 is connected to a heat exchanger 10 and a circulating water pump 11 that exchange heat with the outdoor heat exchanger 5 of the heat pump unit side system A.
, a heat exchanger 12 for exchanging heat between the exhaust gas of the engine 8 and cooling water as a heat medium in the engine side system B and recovering exhaust heat; and an exhaust manifold heat exchanger having a configuration in which the outer periphery of the exhaust manifold is surrounded by a water passage. 13, a water pump 14 in the engine, a water jacket in the engine 8, and a thermostat 15 are connected in series. A passage 16 is also formed that branches from the exhaust manifold 13 and bypasses the water jacket inside the engine 8.

In particular, in the present invention, a compressor connecting portion 8a that protrudes in the output shaft extension direction is provided on one end side of the output shaft of a multi-cylinder engine in which a plurality of cylinders are arranged in the output shaft direction. The compressor 1 is disposed, and as will be described in detail later, a heat exchanger 12 for exhaust heat recovery is provided in a space above the compressor connecting portion 8a between the engine 8 and the compressor 1 in the arrangement described below. Furthermore, the exhaust gas inlet of the heat exchanger 12 and the downstream end of the exhaust gas collection part of the exhaust manifold are arranged close to each other. In addition, the seventh
In the figure, 8b is a housing that accommodates a flywheel that is rotated by the engine output.

Next, the configuration of the engine side system B will be explained with reference to FIGS. The heat exchanger 12 is disposed above the connecting portion 8a so that the longitudinal direction of the heat exchanger 12 is perpendicular to the engine output shaft when viewed from above the engine. The cooling water is
It flows into the inlet part 12a of the heat exchanger 12 as shown by arrow a, passes through the exhaust manifold heat exchanger 13 attached to the upper side of the engine 8 body, flows into the water pump 14 as shown by arrow b, and then flows into the engine 8. After passing through the water jacket in the main body, the water passes through the thermostat 15 and flows out from the outflow portion 20 as shown by arrow c. Also,
Exhaust manifold The exhaust manifold surrounded by the heat exchanger 13 extends in the engine output axis direction along the cylinder row on the side of the engine 8, and the downstream end of the exhaust collecting part is on the heat exchanger 12 side. It is located near the end of the engine. Furthermore, by providing the exhaust gas inlet portion (reference numeral 12e in FIG. 6, which will be described later) at the longitudinal end of the exhaust heat recovery heat exchanger 12 on the exhaust manifold side when viewed from the engine output shaft direction, The downstream end of the exhaust collecting section and the exhaust gas inlet of the heat exchanger 12 are located close to each other, and are connected by respective flanges 12. Note that the side of the heat exchanger 12 opposite to the exhaust gas inlet, that is, the downstream side of the exhaust gas, is provided to be inclined downward. This is to prevent the cooling water passing through the core of the heat exchanger 12 from flowing back into the combustion chamber of the engine even if it leaks due to a crack in the core.

Further, a silencer 21 is provided above the heat exchanger 12 as an exhaust path, and an exhaust manifold of the exhaust manifold heat exchanger 13, the heat exchanger 12, and the silencer 21 are connected in series as an exhaust gas path. The exhaust gas passes through and is discharged in this order. Note that the outdoor heat exchanger 5 of the heat pump refrigerant circuit 6
Since the engine cooling water and the heat exchanger 10 of the cooling water passage 9 are configured to be able to exchange heat, engine cooling water is used as water for heat exchange with the heat load of the heat pump circuit.

4, 5 and 6 show the above heat exchanger 1.
2, the heat exchanger core 12b through which the cooling water communicates with the inlet portion 12a, and the water jacket 1 are shown.
2c and an outlet section 12d, and an inlet section 12e for exhaust gas having a flow opposite to the flow of cooling water;
It has a gas passage 12f and an outlet portion 12g. In addition, the cooling water outlet section 12d and the exhaust gas inlet section 12
e is connected to the exhaust manifold heat exchanger 13 at a flange portion 12h.

To explain the operation of the above configuration, when the engine 8 is operated, the compressor 1 is driven via the output shaft 8a, the heat pump refrigerant circuit 6 is operated, and the indoor heat exchanger 2 is connected to the condensing chamber and the outdoor heat exchanger 2 is operated. When the exchanger 5 acts as an evaporator, indoor heating can be performed, and by switching the four-way valve 3, the indoor heat exchanger 2 acts as an evaporator and the outdoor heat exchanger 5 acts as a condenser. When you do this, you can cool the inside of the room. On the other hand, regarding the operation of cooling water,
The circulating water pump 11 in the heat pump unit side system A operates even when the engine 8 is stopped,
A constant flow rate of the cooling water is circulated from the heat exchanger 12 to the heat exchanger 10 via the exhaust manifold heat exchanger 13. Also, while the engine is running, the water pump 14 inside the engine sucks the cooling water branched from the exhaust manifold heat exchanger 13, and each water jacket 17 inside the engine 8,
18 to cool the engine 8.

Therefore, the cooling water and the exhaust gas are transferred to the heat exchanger 12.
Heat exchange is performed in the exhaust manifold heat exchanger 13 and the exhaust heat is recovered, and the recovered exhaust heat is then heat exchanged in the heat exchanger 10 to the outdoor heat exchanger 5 on the heat pump circuit side. Thus, when the heat pump refrigerant circuit 6 is performing indoor heating operation, waste heat is effectively utilized.

In the present invention, the engine and the compressor are connected by the engine output shaft, and the engine exhaust heat recovery heat exchanger is connected to the compressor connecting portion 8a between the engine 8 and the compressor 1 on the side of the engine on the compressor side. above the
Since the longitudinal direction is arranged so that it is perpendicular to the engine output shaft when viewed from above the engine, the space required for connecting the output shaft can be used effectively to accommodate the exhaust heat recovery heat exchanger. There is no need to increase the overall height or width of the engine. Further, the downstream end of the exhaust gas collection part of the exhaust manifold is located near the engine end on the heat exchanger 12 side, and the exhaust gas inlet of the heat exchanger 12 is located on the exhaust manifold side when viewed from the engine output shaft direction. By arranging them close to each other, the passage between them is shortened to the necessary minimum. Furthermore, in the configuration of this embodiment, the silencer 21 is also provided above the heat exchanger 12, and its installation does not require any extra space, contributing to overall compactness.

(Effects of the invention) As described above, according to the invention, in a heat pump circuit in which a compressor for pressurizing refrigerant is driven by an engine, the engine and the compressor are connected by the engine output shaft, and the engine is attached to the side of the engine on the compressor side. By installing a heat exchanger to recover the exhaust heat of the engine, it is possible to recover the exhaust heat of the engine and use it effectively as a heat source for the heat pump circuit. The above-mentioned heat exchanger can be laid out compactly by utilizing the space existing above, and furthermore, the downstream end of the collecting part of the exhaust manifold and the exhaust gas inlet of the above-mentioned heat exchanger can be brought close to each other so that there is no space between them. The passageway can be made more compact. Therefore, even if a normal vehicle engine is used, the overall height and width of the engine are not increased, and the engine can be made more compact.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an embodiment of the engine in the engine-driven heat pump device of the present invention, Fig. 2 is a top view of the engine, Fig. 3 is a rear view of the engine, and Fig. 4 is a schematic side view of the engine. Figure 5 is a top view of the heat exchanger installed in Figure 4.
6 is a cross-sectional view taken along the line -- in FIG. 4, and FIG. 7 is a schematic diagram showing the structure of an embodiment of the engine-driven heat pump device. 1...Compressor, 8...Engine, 8a...
...output shaft, 12...heat exchanger.

Claims (1)

[Scope of utility model registration request] In an engine-driven heat pump device in which a compressor for pressurizing refrigerant in a heat pump circuit is driven by an engine, a compressor connection part that drives a compressor to one end side of an output shaft of a multi-cylinder engine in which a plurality of cylinders are arranged in the output shaft direction. A compressor is disposed on the one end side of this compressor connection part, and a heat exchanger for exhaust heat recovery where engine exhaust gas and heat medium exchange heat is placed above the compressor connection part between the engine and the compressor. The exchanger is arranged so that its longitudinal direction is perpendicular to the output shaft when viewed from above the engine, and the exhaust manifold is arranged so that it extends in the direction of the engine output shaft along the cylinder row and has an exhaust collecting section. The downstream end of the exhaust heat recovery heat exchanger is located near the engine end on the side of the exhaust heat recovery heat exchanger, and the exhaust gas inlet at the longitudinal end of the exhaust heat recovery heat exchanger is located in the engine output shaft direction. An engine-driven heat pump device characterized in that it is provided on the exhaust manifold side when viewed from above.