JPS6365817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine-driven heat storage system that utilizes engine drive exhaust heat to store heat in a heat medium such as water.

BACKGROUND ART Conventionally, so-called engine heat pumps have been known in which a driven device such as a compressor of a heat pump is driven by an engine, but since this uses an engine, noise countermeasures are required.

Therefore, in order to prevent engine noise and to effectively utilize engine drive exhaust heat, exhaust heat, etc., the engine is immersed in a sealed heat storage tank filled with a heat medium such as water. In addition to solving this problem, a heat storage system was devised that stores exhaust heat from the engine in a heat medium and uses it for heating, hot water, etc.

Usually, such a heat storage system has a structure in which an engine is supported within a heat storage tank, and intake and exhaust pipes of the engine are drawn out through the lid of the heat storage tank. However, with this structure, the lid must be made of a relatively rigid material to hold the intake and exhaust pipes, making it heavy and expensive, and the lid cannot be easily opened, causing damage to internal equipment. Maintenance work was extremely difficult.

An object of the present invention is to provide an internal combustion engine-driven heat storage system that is lightweight, inexpensive, and easy to maintain.

Therefore, in the present invention, in a system in which an internal combustion engine is installed inside a heat storage tank filled with a heat medium such as water, and the drive exhaust heat of this internal combustion engine is used to store heat in the heat medium, the heat storage tank is divided into a can body and a lid body, a support ring for supporting the internal combustion engine is provided between the can body and the lid body, and intake and exhaust processing of the internal combustion engine is performed through this support ring. It is an attempt to achieve a goal.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the engine-driven heat storage system of this embodiment. In the figure, a heat storage tank 1 includes a cylindrical can 2 that is filled with a heat medium such as water and has a heat insulating material (not shown) on the wall surface, and a can that is detachably covered with an opening at the upper end of the can. It is composed of a lid body 3 that is fitted.

The upper peripheral wall of the can body 2 is bent outward into a horizontal plane 4, and then bent upward into a vertical plane 5.
It is bent into a shape. An annular support ring 7 is provided around the entire circumference of the horizontal surface 4 via a hollow ring-shaped vibration absorbing material 6.
is placed. The vibration absorbing material 6 has a ring-shaped hollow tube made of elastic rubber, for example, a bicycle tube shape, and absorbs vibrations acting on the support ring 7 by air injected inside. . Moreover, the support ring 7 is, as shown in FIG.
Four L-shaped connecting plates 9 are attached at 90 degree angle positions on the inner circumference of a hollow rectangular cylindrical ring body 8 placed along the vibration absorbing material 6. At opposing positions of the ring body 8, through holes 8A and 8B are formed to pass through the inner and outer peripheral walls thereof. Further, the outer ends of four support arms 11 that project radially from a mounting plate 10 as a support plate via bolts 16 are connected to the connection plate 9 via bolts 12. The mounting plate 10 is formed in the shape of a floating boat that floats on the surface of the heating medium, and has an engine 13 as an internal combustion engine, which is immersed in the heating medium, on the bottom surface, and an engine 13 on the top surface. The compressor 14, oil filter 15, etc. of the heat pump 30 that is driven by the heat pump 30 are provided. Therefore, the load exerted on the support arm 11 and the support ring 7 due to the loads of the engine 13, compressor 14, etc. is reduced by the buoyant force generated on the mounting plate 10.

The engine 13 has an intake pipe 22 connected to its intake side, one end of which projects through the mounting plate 10 into the space between the lid 3 and the liquid level of the heating medium, and the other end of the intake pipe 22. One end on the exhaust side passes through the through hole 8B of the support ring 7 and connects to the heat storage tank 1.
The other end of the exhaust pipe 24 is connected to the exhaust pipe 24, which protrudes to the outside and is partially immersed in the heat medium. The intake pipe 2
One end of the heat storage tank 2 is led out to the outside of the heat storage tank 1 via a suction pipe 28 inserted into the through hole 8A of the support ring 7. Further, in the middle of the exhaust pipe 24, there is an exhaust gas heat exchanger 25 that releases exhaust heat from the engine 13 into the heat medium in the heat storage tank 1, and a drain pot 27 that leads a drain pipe 26 to the outside of the can body 2. Each is provided. As a result, when the engine 13 is driven, the exhaust heat generated from the engine 13 is directly absorbed by the heat medium, and the high temperature exhaust gas generated at the same time is transferred to the exhaust gas heat exchanger 25, drain pot 27, and exhaust pipe 24 in the heat medium. While passing through, heat is absorbed by the heating medium and the temperature becomes low, which is then discharged to the outside.

Further, in the heat pump 30 using the compressor 14, the refrigerant compressed by the compressor 14 is liquefied in a heat exchanger 31 installed in the lower layer of the heat storage tank 1, that is, below the engine 13, and then passes through an expansion valve 32. The air enters the external evaporator 33, is vaporized and expanded there, and then returns to the compressor 14. The external heat source for the external evaporator 33 may be air or well water, but if there is a need for cooling on the load side of the house, the water can be circulated through a suitable fan coil unit (not shown) and connected to the return pipe 34. do it. Note that the refrigerant pipes inside the heat storage tank 1 and the refrigerant pipes outside the heat storage tank 1 are connected to the support ring 7.
connected through.

On the other hand, the lower peripheral wall of the lid 3 is bent outward into a horizontal plane 41 so as to rest on the support ring 7, and then further bent downward into a vertical plane 42. . A cushion material 45 is interposed between the horizontal surface 41 and the upper surface of the support ring 7 along the entire circumference.

Next, the operation of this embodiment will be explained. Now, when the heat pump 30 is operated by the engine 13, the exhaust heat generated from the engine 13 is directly absorbed by the heat medium, and the high temperature exhaust gas generated at the same time is transferred to the exhaust gas heat exchanger 25, drain pot 27, and exhaust pipe 24. As a result of heat being absorbed by the heat medium while being discharged to the outside through the heat storage tank 1, the temperature of the heat medium in the heat storage tank 1 is increased.

On the other hand, when the refrigerant compressed and made high-pressure by the compressor 14 is liquefied in the heat exchanger 31 immersed in the lower part of the engine 13, it imparts condensation heat to the surrounding heating medium to raise its temperature. After that, expand the expansion valve 3.
2, in the external evaporator 33, the gas is vaporized and expanded by taking heat from the outside, and returns to the compressor 14 again.
As a result, the temperature of the heat medium in the heat storage tank 1 is increased by the heat pump 30 that uses air, well water, or the like as an external heat source.

In this case, the water area inside the can body 2 does not have to be divided into a high-temperature layer and a low-temperature layer, but can be arranged as shown in the figure, that is, the engine 13 is placed in the upper part of the heat medium, and the heat exchanger 31 of the heat pump 30 is placed in the lower part. Then, temperature stratification due to natural convection can be obtained. Incidentally, with the configuration of this embodiment, hot water of about 50° C. or more is formed in the layer above the engine 13, and hot water with an upper limit of about 50° C. is formed in the layer below.

Therefore, when using this for heating, as shown in the example shown, a circulation pump 51 is used to circulate hot water in the can body 2 through a fan coil unit (not shown) and into the can body 2 from a return pipe 52. However, in this case, the high temperature range discharge pipe 53 is attached to the upper wall of the can body 2.
By providing low-temperature range discharge pipes 54 on the central wall and switching between them with a switching valve 55, efficient heating can be achieved.
That is, when a high amount of heat is required at the start of heating, high-temperature water is sent from the high-temperature range discharge pipe 53 to perform rapid heating, and when a steady state is reached, the switching valve 55 is switched to supply low-temperature water from the low-temperature range discharge pipe 54. If you send it, you can perform economical heating operation. Therefore, it also leads to energy saving.

If hot water is to be supplied, hot water in the can body 2 may be directly supplied, but clean hot water can be obtained by using hot water supply coils 56 and 57 as shown in the illustrated example. At this time, the hot water temperature level may be set by adjusting the heat transfer area of the hot water supply coils 56 and 57.

Therefore, according to this embodiment, the engine 13 for driving the heat pump 30 is immersed in the upper part of the heat medium such as water filled in the can body 2, and the heat exchanger 31 of the heat pump 30 is immersed in the lower part. As a result, the heat pump 3 is activated by the engine 13.
0, the upper part of the heat medium where the engine 13 is located is a high temperature layer, and the lower part where the heat exchanger 31 is located is a low temperature layer. is formed, hot water can be efficiently produced while maintaining a small size and a high COP (coefficient of performance) of the heat pump 30. This also has the advantage that since the engine 13 is immersed in hot water at a high temperature, cold starts and various troubles associated therewith do not occur.

In this case, the heat generated from the main body of the engine 13 is directly absorbed by the heat medium, and the high temperature exhaust gas generated at the same time is absorbed by the heat medium while being discharged to the outside through the exhaust gas heat exchanger 25. , engine 1
All the waste heat from 3 can be effectively utilized to obtain high temperature hot water, thus saving fuel costs. Incidentally, if the configuration of this embodiment is adopted, hot water of about 50° C. or higher can be obtained above the engine 13, and hot water of about 50° C. can be obtained below the engine 13. Moreover, since these high-temperature and low-temperature layers are formed by natural convection, there is no need to separate the high-temperature and low-temperature layers using, for example, a partition plate. Rather,
The amount of heat dissipated between the engine 13 and the heat exchanger 31 is determined by the operating conditions, such as the outside temperature condition, and a high temperature layer and a low temperature layer are formed according to the ratio, so there is no need to perform detailed control. First, there is no need to make the tank two-layered, which has the advantage of reducing costs.

Thereby, by utilizing the hot water with different temperatures formed in the heat storage tank 1, it can be used for many other purposes in addition to heating and hot water supply. On this occasion,
When performing heating, a high temperature range discharge pipe 53 and a low temperature range discharge pipe 54 are provided according to the temperature stratification of the heating medium, and if these are switched by the switching valve 55, efficient heating operation can be performed.

In addition, since the mounting plate 10 equipped with the engine 13 and the compressor 14 is shaped like a floating boat, the buoyancy generated in the mounting plate 10 allows the engine 13 and the compressor 14 to be
The load acting on the support arm 11 and the support ring 7 due to the load can be reduced.

In addition, the tip of the support arm 11 is connected to the annular support ring 7, and this is supported around the entire circumference of the can body 2 via the hollow ring-shaped vibration absorbing material 6.
Since the load acting in the vertical direction is evenly distributed around the entire circumference of the can body 2 and is not concentrated, the spring constant of the vibration absorbing material 6 can be reduced, resulting in a sealing effect that prevents leakage of heat medium and noise from the engine and compressor. In addition, secondary vibrations to the can body 2 can be reliably prevented.

This also means that the stationary system of the can body 2 containing the heating medium and the vibration system having the engine 13, compressor 14, etc. are isolated around the entire circumference of the can body 2 via the vibration absorbing material 6. There is no damage to piping, etc. due to differences in systems. For example, since the refrigerant piping to the compressor 14 is also in the same system as the vibrating body of the engine 13, accidents such as refrigerant leaks are eliminated.

Further, since the intake pipe 22 and exhaust pipe 24 of the engine 13 are led out of the heat storage tank 1 through the support ring 7, the lid body 3 can be easily opened. Therefore, maintenance work on internal equipment,
In particular, inspection and replacement of the oil filter 15 can be easily performed. Moreover, since the lid body 3 does not need to hold the intake pipe 22 and the exhaust pipe 24, it can be manufactured from a relatively rigid and lightweight material, such as a film-like material, and is therefore inexpensive. However, if it is made of a rigid material, there is an advantage that other equipment such as the external evaporation equipment 33 can be placed on the top surface of the lid body 3.

Furthermore, the engine 13 is immersed in the heat medium of the can body 2, and while the noise from the engine 13 to the sides and the bottom of the can body 2 is blocked, the engine noise leaking upward and the mechanical noise of the compressor 14 are blocked. Since the noise is blocked by the lid 3, these noises can be completely blocked.

Note that in implementation, the engine 13 does not need to be immersed in the heat medium of the can 2. For example, if only a part of the engine 13 or the exhaust pipe 24 is immersed in the heat medium, in other words, if the exhaust heat of the engine 13 is to be used for storing heat in the heat medium, the mode of immersion is not an issue. It's not something you do.

Furthermore, if noise reduction means 61 and 62 shown in FIG. 3 are provided inside the support ring 7, intake and exhaust noise of the engine 13 can be suppressed. These silencing means 61, 62 constitute a plurality of silencing chambers 64, 65, 66 inside the support ring 7 by a partition plate 63, and these silencing chambers 64, 65, 6
6 are sequentially communicated through throttle tubes 67 and 68, and while the intake air and exhaust air pass through these silencing chambers 64, 65, and 66, they are repeatedly throttled and diffused, thereby muffling the noise. Therefore, the silencing means 61,
62 is formed within the support ring, the overall size can be reduced.

In addition to the hollow tube made of elastic rubber described in the above embodiment, the vibration absorbing material 6 may be made of a foamed sponge material or the like as long as it can obtain a spring constant equivalent to the low spring constant of air suspension. It's okay.
Furthermore, if a sound absorbing material, a sound insulating material, or the like is attached to the inner surface of the lid 3, it is possible to further reduce engine noise and compressor mechanical noise.

As described above, according to the present invention, it is possible to provide an internal combustion engine-driven heat storage system that is lightweight, inexpensive, and easy to maintain.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a perspective view showing the support ring, and FIG. 3 is a perspective view showing a modified example of the support ring. DESCRIPTION OF SYMBOLS 1... Heat storage tank, 7... Support ring, 10... Mounting plate as a support plate, 1
DESCRIPTION OF SYMBOLS 1... Support arm, 13... Engine as an internal combustion engine, 22... Intake pipe, 24... Exhaust pipe, 6
1,62...Sound deadening means.

Claims (1)

[Scope of Claims] 1. In a system in which an internal combustion engine is installed inside a heat storage layer filled with a heat medium such as water, and the drive exhaust heat of the internal combustion engine is used to store heat in the heat medium, The layer is divided into a can body and a lid body, a support ring for supporting the internal combustion engine is provided between the can body and the lid body, and supply and exhaust processing for the internal combustion engine is performed through the support ring. Features an internal combustion engine-driven heat storage system. 2. The internal combustion engine-driven heat storage system according to claim 1, characterized in that a muffling means for muffling at least one of intake and exhaust sounds of the internal combustion engine is configured inside the support ring. 3. According to claim 1 or 2, a plurality of support arms are provided protruding from the support ring, and the internal combustion engine is supported at the inner ends of these support arms via support plates. An internal combustion engine-driven heat storage system. 4. The internal combustion engine-driven heat storage system according to claim 3, wherein the support plate is shaped like a floating boat that can float on the surface of the heat medium.