JPH025896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffling device for an engine-driven system, such as an engine-driven heat pump system.

Conventionally, so-called engine heat pumps, in which a heat pump compressor is driven by an engine, have been known. Since this device uses an engine, noise becomes a problem.

Therefore, in addition to this noise countermeasure, in order to effectively utilize the driving heat and exhaust heat of the engine, we immersed the engine in a water tank filled with a heat medium such as water, thereby solving the engine noise and A system was devised in which a heating medium is heated by exhaust heat and used as a heat source for hot water supply, etc.

However, such a system is not perfect as a noise countermeasure because the driven equipment driven by the engine, such as the compressor, is exposed to the outside. Furthermore, since the engine is fixed to a part of the water tank, vibrations caused by the engine drive are transmitted to the outside through the water tank, resulting in a problem of noise caused by the vibrations.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a muffling device that reduces noise caused by noise and vibration caused by driving an engine drive system.

Therefore, in the present invention, an engine is provided inside a water storage tank containing a heat medium such as water, and a driven device driven by the engine is provided outside the water tank, and the drive exhaust heat of the engine is provided. In an engine drive system that heats the heat medium by a heat exchanger, the engine and the driven equipment are fixed to an engine mounting part that is supported on another part of the surface of the water tank via a vibration isolating material. It blocks vibrations from driving equipment and also blocks noise generated by vibrations propagated to the water tank. Furthermore, by covering the engine mounting portion and the driven equipment including the vibration isolating material with a soundproof case, mechanical noise accompanying the operation of the engine and driven equipment and vibration noise due to vibration of the engine mounting portion are blocked. Furthermore, an intake noise silencing path is connected to the intake side of the engine inside the soundproof case and is capable of muffling the intake noise of the engine and cooling the driven equipment with outside air that is sequentially introduced by the intake negative pressure of the engine. By configuring this, it is possible to prevent overheating of driven equipment and reduce engine intake noise, thereby achieving the above objectives.

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

FIG. 1 shows the entirety of this embodiment. In the figure, a water storage tank 1 includes a cylindrical tank main body 2 filled with a heat medium (water in this embodiment), a vibration isolating material 3 such as rubber, and a seal at the top opening of the tank main body 2. It is comprised of a lid body 5 that is fitted watertightly through a material 4. The vibration isolating material 3 is attached to the tank body 2
They are provided at several locations in the circumferential direction in the vertical gaps between the lid body 5 and the lid body 5. Thereby, vibrations of the lid body 5 are absorbed and not transmitted to the tank body 2. Further, the sealing material 4 is inserted along the entire circumference of the gap between the tank body 2 and the lid 5 in the circumferential direction, so that the water storage tank 1 has a completely sealed structure.

On the other hand, in the lid body 5, a central engine mounting portion 5A is cut off from the other portion 5B and is supported by the other portion 5B via a vibration isolating material 10 made of rubber or the like. The engine mounting portion 5A has an engine 11 immersed in the heat medium on its lower surface.
A compressor 13 as a driven device, which is driven by the engine 11 and whose exterior is covered by a soundproof case 12, is attached to the upper surface.

The soundproof case 12 has a double chamber structure partitioned from each other by an inner case 14A and an outer case 14B. The inside of the inner case 14A is communicated with the atmosphere through a filter 17, and the space between the inner case 14A and the outer case 14B is communicated with the atmosphere through an introduction pipe 18. Each case 14A,
14B, a compressor 13 is mounted on the top surface of the lid body 5;
It consists of a cylindrical damping plate attached to cover the damping plate, and a sound absorbing material 16 having heat insulating properties attached to the inner surface of the damping plate. Here, as the damping plate 15, a heavy plate, for example, a composite plate of ferrite, lead, rubber, etc. is used. Further, as the sound absorbing material 16, for example, asbestos, glass wool, urethane, honeycomb core, or the like is used.

Further, inside the inner case 14A of the soundproof case 12, one end of the intake pipe 21 is connected to the intake port side of the engine 11, and the other end thereof is passed through a lip seal 24 provided on the engine mounting portion 5A of the lid body 5. It protrudes, and is configured so that air intake from the engine 11 is carried out through the internal space of the inner case 14A and the filter 17. That is, due to the intake negative pressure of the engine 11 that is transmitted into the inner case 14A through the intake pipe 21, outside air is introduced from the filter 17, and the introduced outside air passes through the inner case 14A and the intake pipe 21 in order and then flows into the engine 11.
is inhaled. Therefore, the intake sound of the intake pipe 21 or the engine 11 is muffled in the closed space inside the inner case 14A, and the inner space of the inner case 14A constitutes an intake sound muffling path for the engine 11.

Here, the filter 17 is arranged at the upper end of the inner case 14A, and the intake pipe 21 is arranged at the lower end of the inner case 14A. Flows around it. For this reason, the compressor 13 has an inner case 14A which is an intake noise muffling path.
It is configured to be appropriately cooled by outside air passing through the inside. Note that since the heat generated by the compressor 13 is gradually cooled down by a large amount of outside air that is successively introduced, it is possible to prevent the temperature of the air taken into the engine 11 from becoming excessively high.

On the other hand, on the exhaust port side of the engine 11, the inner case 14A and the outer case 14B are connected through a lip seal 25 whose middle part is immersed in the heat medium and whose one end is provided on the other part 5B of the lid 5. The other end of the exhaust pipe 22 protruding into the space between is connected, and the exhaust from the engine 11 is connected to the inner case 14A and the outer case 14B.
It is configured to be discharged to the outside from an introduction pipe 18 opened on the upper surface of the outer case 14B through a space between the two. Therefore, the exhaust noise of the engine 11 is muffled in the closed space between the inner case 14A and the outer case 14B.
A and the space between the outer case 14B and the introduction pipe 1
8 constitutes an exhaust muffling path for the engine 11.

Furthermore, a radiator 23 is provided in the middle of the exhaust pipe 22 at a position near the engine 11 to radiate exhaust heat from the engine 11 into the heat medium of the tank body 2. As a result, when the engine 11 is driven, exhaust heat from the engine 11 is released from the radiator 23, and as a result, the heat medium in the tank body 2 is heated.

Further, a known heat pump circuit 31 is connected to the compressor 13. In the heat pump circuit 31, a pipe 30 from one connection port side of the compressor 13 connects to the heat exchanger 3 in the water storage tank 1.
2, a pipe 33 from the other end of the heat exchanger 32 passes through a seal 38 provided on the lid 5 to the expansion valve 34, and a pipe 35 from the expansion valve 34 connects to the other end for heat exchange. Piping 37 from the other end of the heat exchanger 36 is connected to one end of the heat exchanger 36 through the filter 17 of the soundproof case 12 and connected to the other connection port of the compressor 13. It is configured as a circuit.

Next, the operation of this embodiment will be explained. Now, when the compressor 13 is driven by starting the engine 11, the heat pump circuit 31 can heat the heat medium in the water storage tank 1 or cool the room using a known refrigeration cycle.

On the other hand, when the engine 11 is started, the temperature of the engine 11 is gradually increased, and the exhaust gas from the engine 11 is discharged to the outside through the exhaust pipe 22. Then, the heat generated by the temperature rise of the engine 11 is directly transferred, and the exhaust heat from the engine 11 is transferred directly to the radiator 2.
3, and are absorbed by the heat medium in the water storage tank 1, respectively. As a result, the temperature of the heat medium in the water storage tank 1 is increased not only by heat generated from the engine 11 and exhaust heat from the engine 11, but also by heat radiation from the heat pump circuit 31.

The heat medium heated in this way is used as a heat source for hot water supply and space heating.

Therefore, according to this embodiment, the compressor 13 is driven by the engine 11 to perform cooling, and at the same time, the heat medium in the water storage tank 1 is pumped using heat generated from the engine 11, exhaust heat, and heat radiation from the heat pump circuit 31. Since the heating medium is used as a heat source for heating, hot water supply, etc., energy can be used effectively, and one engine 11 can perform cooling, heating, and hot water supply.

Further, since the engine 11 is immersed in the heat medium in the sealed water tank 1 and the compressor 13 is covered with the soundproof case 12, the noise of the engine 11 and the compressor 13 can be reduced.
In addition, since the soundproof case 12 only needs to be placed around the compressor 13, the overall structure can be made smaller and less expensive.

Moreover, the soundproof case 12 is formed into a double chamber structure partitioned from each other by an inner case 14A and an outer case 14B.
Since the engines are exhausted through the spaces between the two, the soundproof case 12 acts as a muffler to muffle the intake and exhaust sounds of the engine 11, thereby further reducing the noise of the entire system.

In addition, the lid 5 is fitted to the tank body 2 via the vibration isolator 3, and the engine mounting portion 5A of the lid 5 is supported via the vibration isolator 10 with respect to the other portion 5B. Since the engine 11 and the compressor 13 are attached to the mounting part 5A, the mechanical vibrations of the engine 11 and the compressor 13 are absorbed by the vibration isolator 10, and furthermore, the vibrations transmitted to the other part 5B of the lid 5 are absorbed by the vibration isolator. 3, not only is there no noise associated with the mechanical vibrations, but also transmission of the mechanical vibrations to the tank body 2 can be prevented.

Furthermore, the soundproof case 12 is equipped with a damping plate 15 and a sound absorbing material 1.
6, and the sound absorbing material 16 is made of a material with heat insulating properties, so that heat radiation from the compressor 13 can be blocked, and the outside air that is sequentially introduced from the filter 17 due to the intake negative pressure of the engine 11 can be passed through the compressor. 13 for cooling. Therefore, even when surrounded by the soundproof case 12, the temperature of the compressor 13 can be prevented from rising, and the efficiency of the heat pump can be improved.

In addition, when implementing the system, if the outer case 14B of the soundproof case 12 is configured to cover the entire lid 5 as shown in FIG. 2, leakage noise from the lid 5 can also be insulated. The overall noise can be further reduced.

Further, as shown in FIG. 3, if the inner case 14A and outer case 14B of the soundproof case 12 are constructed in a bellows shape that can be expanded and contracted in the vertical direction, the compressor 1
3. Soundproof case 12 according to the natural frequency of the equipment
Since the volume of the compressor 13 can be changed and set, it is possible to particularly absorb noise components from equipment such as the compressor 13. In this case, the sound absorbing material 16 is preferably a viscoelastic material such as asphalt. In addition to the structure shown in FIG. 3, the variable volume structure of the soundproof case 12 may be constructed by, for example, constructing the soundproof case with an inner cylinder and an outer cylinder that are slidable against each other, one of which is slidable relative to the other. A similar effect can be achieved even with a nested structure (so-called telescopic structure) in which the overall volume is changed by changing the volume. Further, the sound absorbing material 16 may be provided not only on the inner surface of the damping plate 15 but also only on the outer surface or both surfaces.
In particular, if the sound absorbing material 16 made of a viscoelastic body is attached to the outer surface of the damping plate 15, the surface vibration of the damping plate 15 can be absorbed and the soundproofing effect can be further improved.

Further, as shown in FIG. 4, the soundproof case 12 is formed into a double cylinder structure with an inner cylinder 52 and an outer cylinder 53,
While a muffler 54 serving as an intake muffling path is configured in the space between the inner cylinder 52 and the outer cylinder 53, the muffler 24 may be provided in the exhaust pipe 22. Silencer 5
4, the space between the inner cylinder 52 and the outer cylinder 53 is appropriately divided by a radial partition wall 55, and the divided chambers 56, 57, 58 communicate with each other through communication pipes 59, 60. has been done. In this way, the outside air introduced from the introduction pipe 61 is transferred to the room 56.
The intake air from the engine 11 enters the room 58 through the communication pipe 59, then enters the room 57 through the communication pipe 60, and is supplied to the engine 11 from the intake pipe 21 after repeated throttling and diffusion. Sound can be efficiently reduced. Furthermore, the heat generated by the compressor 13 accumulated in the inner cylinder 52 can be appropriately cooled by the outside air that comes into contact with the inner cylinder 52, thereby preventing the compressor 13 from overheating.

In this case, if the inner surfaces of each room 56, 57, and 58 are lined with asphalt or the like,
It is possible to improve the sound deadening effect. Further, the soundproof case 12 may have a triple-tube structure, and the exhaust side can be configured in the same manner as above using the outermost space.

Furthermore, as shown in FIG. 5, the soundproof case 12 is
It may be configured by one case.

In addition, in the above embodiment, the engine 11 was immersed in the heat medium in the water tank 1, but since the water tank 1 has a sealed structure, the engine 11 does not necessarily need to be immersed. Water tank 1
The noise of the engine 11 can be reduced even when the engine 11 is in the air. Of course, if the engine 11 is immersed in the heat medium in the water tank 1, the engine 1
As mentioned above, the heat generation from 1 can be directly used for heating the heat medium, which is more efficient.

Note that the present invention is not limited to the heat pumps described in the above embodiments, but can also be applied to any device driven by an engine, such as a generator or a pump, to reduce operating noise. In addition to blocking the sound with a soundproof cover, the heat generated by each operation can be cooled by the engine intake air.

As described above, according to the present invention, it is possible to provide a silencer that reduces mechanical noise and intake/exhaust noise associated with driving an engine drive system, as well as noise caused by vibration.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
FIGS. 5 to 5 are diagrams showing modified examples of the soundproof case. 1...Water tank, 5A...Engine mounting part, 1
0...Vibration isolation material, 11...Engine, 12...Soundproof case, 14A...Inner case, 14B...Outer case, 17, 21...Filter and intake pipe forming an intake silence path in the soundproof case, 18, 22...
Introductory pipe and exhaust pipe forming an exhaust noise muffling path in the soundproof case, 15... Vibration damping plate, 16... Sound absorbing material, 1
3... Compressor as a driven device, 54...
...A silencer as an intake silencer.

Claims (1)

[Scope of Claims] 1. An engine is provided inside a water tank filled with a heat medium, and a driven device driven by the engine is provided outside the water tank, and the drive exhaust heat of the engine is provided. Therefore, in the engine drive system that heats the heat medium, the engine and the driven equipment are fixed to an engine mounting part that is supported on another part of the surface of the water tank via a vibration isolator, and the engine and the driven equipment are fixed to the engine mounting part, which includes the vibration isolator. The engine mounting part and the driven equipment are covered with a soundproof case, and outside air is connected to the intake side of the engine inside the soundproof case so that the intake noise of the engine can be muffled, and the outside air is sequentially introduced by the intake negative pressure of the engine. A silencer for an engine drive system, comprising: an intake silencer path capable of cooling the driven equipment. 2. In claim 1, the soundproof case is characterized by comprising a vibration damping plate and a sound absorbing material affixed to at least one of the inner and outer surfaces of the vibration damping plate. Silencer for engine drive system. 3. The sound damping device for an engine drive system according to claim 2, wherein the sound absorbing material has heat insulating properties. 4. The noise damping device for an engine drive system according to claim 1, wherein the soundproof case is formed to have a variable volume.