JPS6329186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine-driven heat pump used as a heating device, a hot water supply device, etc. An engine-driven compressor that uses engine exhaust heat such as engine cooling water and exhaust gas to heat water supply or space heating liquid with an advantageous thermal economy; a first heat exchanger that condenses the medium by heat exchange with a hot water supply or heating liquid; an expansion valve;
A second heat exchanger that evaporates the heat medium by heat exchange with outside air or heat source water is provided, and a hot water supply or heating liquid supply path with the first heat exchanger interposed is connected to the engine exhaust heat. The present invention relates to an engine-driven heat pump that is provided with a third heat exchanger that heats and raises the temperature of hot water supply or space heating fluid through heat exchange.

In conventional engine-driven heat pumps, when the outside temperature drops significantly, or when heat source water such as groundwater or wastewater freezes or becomes unusable due to piping system failure, the heat medium loses its cooling capacity. Since a certain amount of wet steam is supplied to the compressor as it is, there is a drawback that not only the heat exchange efficiency in the first heat exchanger is reduced, but also the heat pump itself cannot be used.

The first aspect of the present invention is to enable the desired hot water supply or space heating to be economically advantageously maintained even when the outside temperature drops significantly or when a situation occurs where heat source water cannot be used. There is one purpose, and the second purpose is to enable the above-mentioned first purpose to be implemented advantageously in terms of structure and cost.

In the engine-driven heat pump according to the first aspect of the present invention, a bypass path that bypasses the third heat exchanger and a circulation path that passes through the third heat exchanger are connected to the hot water supply or heating liquid supply path. It is possible to provide a mechanism that can control the opening and closing of a bypass path and a circulation path, and to heat the heat medium after passing through the expansion valve by having the liquid heated and heated in the third heat exchanger in the circulation path. The characteristic configuration is that a fourth heat exchanger is provided.

The functions and effects of the above characteristic configuration are as follows.

In other words, when the outside temperature drops significantly or a situation occurs in which the heat source water cannot be used, the third heat source water is switched to the operating state by switching the bypass path and the circulation path through the opening/closing control mechanism. The heat medium that has passed through the expansion valve can be heated to dry steam or superheated steam using the liquid heated and heated by heat exchange with engine exhaust heat in the exchanger. Moreover, since the liquid that has passed through the fourth heat exchanger is recirculated to the third heat exchanger,
For example, while discarding the liquid that has passed through the fourth heat exchanger, it is possible to avoid waste of liquid and heat loss, such as when the newly supplied liquid is exchanged with engine exhaust heat in the third heat exchanger. Can be done.

Therefore, even if the outside temperature drops significantly or a situation occurs where the heat source water cannot be used, the desired hot water supply or heating effect can be maintained economically.

In the engine-driven heat pump according to the second aspect of the present invention, a bypass path that bypasses the third heat exchanger and a circulation path that passes through the third heat exchanger are connected to the hot water supply or heating liquid supply path. The present invention is characterized in that a mechanism capable of opening and closing the bypass path and the circulation path is provided, and a part of the circulation path is inserted through the second heat exchanger.

The functions and effects of the above characteristic configuration are as follows.

That is, a part of the circulation path is inserted into the second heat exchanger, and this heat exchanger heats the heat medium after passing through the expansion valve with the liquid heated and heated in the third heat exchanger. Compared to the case where a dedicated fourth heat exchanger is provided separately, the structure is designed to improve heat exchange efficiency while simplifying the structure and reducing costs. I ended up getting it.

Embodiments of the present invention will be described below based on the drawings.

When constructing a hot water supply system using an engine-driven heat pump, as shown in FIG. a first heat exchanger 6 that condenses the hot water supply water by heat exchange with the hot water supply water in the tank 5 and heats the hot water supply water to raise its temperature; an expansion valve 7;
A second heat exchanger 8 is interposed to evaporate the heat medium after passing through the expansion valve 7 by exchanging heat with outside air.

A hot water supply pipe 10 having a faucet 9 was connected to the upper part of the hot water storage tank 5, and a water supply pipe 11 was connected to the lower part of the hot water storage tank 5, and the lower part and the upper part of the hot water storage tank 5 were connected in communication. The circulation supply route (an example of a liquid supply route for hot water supply or heating) 12 includes:
A heat exchanger for engine cooling water, which is a component of the pump 13 that forcibly circulates water for hot water supply, the first heat exchanger 6, and the third heat exchanger 14 that heats water for hot water supply by heat exchange with engine exhaust heat. 14A and an engine exhaust heat exchanger 14B are interposed.

The circulation supply path 12 includes a bypass passage 15 that bypasses the engine exhaust heat system heat exchangers 14A and 14B, and an engine exhaust heat system heat exchanger 14.
Connecting the circulation path 16 passing only through A and 14B,
A mechanism 17 capable of opening and closing the bypass path 15 and the circulation path 16 is provided, and a forced circulation pump 18 and a fourth heat exchanger 19 are provided in the circulation path 16.
is intervening.

The second heat exchanger 8 is provided in the heat medium circulation path 4.
A bypass passage 20 is connected to bypass the engine exhaust heat system, and a part of this bypass passage 20 is inserted through the fourth heat exchanger 19.
By supplying the water heated and heated in 4A and 14B to the fourth heat exchanger 19, the heat medium after passing through the expansion valve 7 can be heated with the heat retained in this water.

The opening/closing control mechanism 17 is connected to the bypass path 15
It is composed of three-way valves 17A, 17B, and 17C interposed respectively at both connection parts of the circulation path 16 and the upper connection part of the circulation path 16.
A three-way valve 21 is also interposed at the upper side connection portion of 0.

In normal operation, each of the three-way valves is operated to close both the bypass paths 15, 20 and the circulation path 16, and the water for hot water supply in the hot water storage tank 5 is passed through each heat exchanger 6, 14A, 14B to the hot water storage tank. 5, while the heat medium passing through the expansion valve 7 is circulated to the compressor 3 through the second heat exchanger 8.

In severe cold weather operation, the three-way valves are operated to open both the bypass paths 15, 20 and the circulation path 16, and the pump 18 is driven to transfer hot water in the hot water storage tank 5 to the first heat exchanger 6 and the bypass path. While circulating the hot water into the storage tank 5 through the channel 15, the expansion valve 7
The heat medium passing through the bypass passage 20 and the fourth heat exchanger 1
9 to circulate the fluid to the compressor 3. At this time,
Since the water in the circulation path 16 is forced to circulate and flow through both heat exchangers 14A and 14B of the engine exhaust heat system and the fourth heat exchanger 19, the retained heat of the water heated by the engine exhaust heat is absorbed. Utilizing this, the heat medium after passing through the expansion valve 7 can be reliably heated to dry steam or superheated steam.

The heat source water includes tap water, groundwater, wastewater,
It is best to select and use appropriate water such as pond water.

The latent heat of condensation of the heat medium can be used for heating in addition to the above-mentioned case, and the latent heat of vaporization of the heat medium can also be used for cooling.

Part of the water heater may be modified as follows.

() In the case of the embodiment shown in FIG. 2, the heat medium after passing through the expansion valve 7 is evaporated by heat exchange with heat source water, and the heat source water is supplied to the second heat exchanger 8 with a pump 26. A pump 18 is provided between the route 22 and the circulation supply route 12, which is capable of forcing water to circulate and flow across both heat exchangers 14A, 14B of the engine exhaust heat system and the second heat exchanger 8.
The second heat exchanger 8 is connected to a fourth heat exchanger 8 for heating the heat medium after passing through the expansion valve 7 with water heated by engine exhaust heat. This structure is also used as the heat exchanger 19.

In this embodiment, the opening/closing control mechanism 17
are three-way valves 17A, 17B, 17C, which are respectively interposed at both connecting portions of the bypass path 15 and both connecting portions of the circulation path 16 on the heat source water supply path 22 side.
It is composed of 17D.

() In the embodiment shown in FIG. 3 and the embodiment shown in FIG. 4, a part of the circulation path 16 is inserted into the second heat exchanger 8, and the second heat exchanger 8
The fourth heat exchanger 19 also serves as the fourth heat exchanger 19.

However, in the case of the embodiment shown in FIG. 4, the bypass path 15 bypasses both the engine cooling water heat exchanger 14A and the engine exhaust heat exchanger 14B, and the bypass path 15 bypasses only the engine exhaust heat exchanger 14B. and a state in which the circulation path 16 passes water through both the engine cooling water heat exchanger 14A and the engine exhaust heat exchanger 14B, and the engine exhaust heat exchanger 14B. It is configured so that it can be switched between a state where water is passed only through the filter.

In the case of this embodiment, the opening/closing control mechanism 17 includes five three-way valves 17A, 17B, 17C,
It is composed of 17D and 17E.

() Figures 5 and 6 show an example of the second heat exchanger 8 used in Figures 3 and 4, respectively, and the one in Figure 5 has heat medium pipes 23 and hot water pipes 24. These pipes 23,
It is constructed by fixing a large number of fins 25 in 24 groups, and the one shown in FIG. , 24 groups, and a large number of fins 25 are fixedly attached to each other.

() In the case of the embodiment shown in FIG. 7, the fourth heat exchanger 19 is interposed in the route portion of the heat medium circulation route 4 located between the second heat exchanger 8 and the compressor 3. It is.

() Engine lubricating oil is used as engine exhaust heat.

() The second heat exchanger 8 and the fourth heat exchanger 19 are arranged close to each other, and the hot water in the fourth heat exchanger 19 and the heat medium in the second heat exchanger 8 are used as a heat transport medium. It is configured to perform indirect heat exchange.

[Brief explanation of the drawing]

Fig. 1 is a piping system diagram showing a hot water supply system using an engine-driven heat pump, Figs. 2 to 4 and 7 are piping system diagrams showing different embodiments, and Fig. 5
6 are perspective views of the heat exchanger, respectively. 1... Engine, 3... Compressor, 6... First heat exchanger, 7... Expansion valve, 8... Second heat exchanger, 1
2... Liquid supply route for hot water supply or heating, 14...
Third heat exchanger, 14A... Engine cooling water heat exchanger, 14B... Engine exhaust heat exchanger, 15
...Bypass path, 16...Circulation path, 17...Opening/closing control mechanism, 19...Fourth heat exchanger.

Claims (1)

[Claims] 1. A compressor 3 driven by the engine 1, a first heat exchanger 6 that condenses the pressurized heat medium from the compressor 3 by heat exchange with a liquid for hot water supply or heating, and an expansion valve 7. , a second heat exchanger 8 for evaporating the heat medium by heat exchange with outside air or heat source water;
An engine-driven engine in which a third heat exchanger 14 is provided in a hot water supply or heating liquid supply path 12 with a heat exchanger 6 interposed therebetween, which heats and raises the temperature of the hot water supply or heating fluid by heat exchange with engine exhaust heat. In the type heat pump, the hot water supply or heating liquid supply route 1
2, a bypass path 15 that detours around the third heat exchanger 14 and a circulation path 1 that passes through the third heat exchanger 14;
A mechanism 17 is provided in which the bypass passage 15 and the circulation passage 16 can be opened and closed, and the circulation passage 16 is connected to the third heat exchanger 14.
An engine-driven heat pump characterized in that a fourth heat exchanger 19 is provided that can heat the heat medium after passing through the expansion valve 7 with the heated liquid. 2. The engine-driven heat pump according to claim 1, wherein the third heat exchanger 14 is an engine exhaust heat exchanger. 3. The engine-driven heat pump according to claim 1, wherein the third heat exchanger 14 is an engine cooling water heat exchanger. 4. The engine-driven heat pump according to claim 1, wherein the third heat exchanger 14 includes an engine cooling water heat exchanger 14A and an engine exhaust heat exchanger 14B. 5. Claim 1, wherein the heat exchange means between the liquid and the heat medium in the fourth heat exchanger 19 is a direct heat exchanger.
The engine-driven heat pump according to any one of items 1 to 4. 6. The engine-driven type according to any one of claims 1 to 4, wherein the heat exchange means between the liquid and the heat medium in the fourth heat exchanger 19 is indirect heat exchange using outside air as a medium. heat pump. 7 A state in which the bypass path 15 bypasses both the engine cooling water heat exchanger 14A and the engine exhaust heat exchanger 14B, and the engine exhaust heat exchanger 14
The circuit is configured such that it can be switched between a state in which only the engine cooling water heat exchanger 14A and an engine exhaust heat exchanger 14B are bypassed, and a state in which the circulation path 16 passes liquid through both the engine cooling water heat exchanger 14A and the engine exhaust heat exchanger 14B. The engine-driven heat pump according to claim 4, wherein the engine-driven heat pump is configured to be switchable between a state in which liquid is passed only through the heat exchanger 14B. 8 A compressor 3 driven by the engine 1, a first heat exchanger 6 that condenses the pressurized heat medium from the compressor 3 by heat exchange with a liquid for hot water supply or heating, an expansion valve 7, a heat medium that converts the heat medium to outside air or a second heat exchanger 8 that evaporates through heat exchange with heat source water;
An engine-driven system in which a third heat exchanger 14 is provided in a hot water supply or heating liquid supply path 12 with a heat exchanger 6 interposed therebetween, which heats and raises the temperature of the hot water supply or heating fluid by heat exchange with engine exhaust heat. In the type heat pump, the hot water supply or heating liquid supply route 1
2, a bypass path 15 that detours around the third heat exchanger 14 and a circulation path 1 that passes through the third heat exchanger 14;
6, and is provided with a mechanism 17 that can control opening and closing of the bypass path 15 and the circulation path 16, and a part of the circulation path 16 is inserted through the second heat exchanger 8. Engine-driven heat pump.