JPS644055B2 - - 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.

Generally, so-called engine heat pumps, in which the compressor of a heat pump is driven by an engine, have a noise problem because they use an engine.

Conventionally, in order to prevent this noise and to effectively utilize the driving heat and exhaust heat of the engine, the engine was immersed in a water tank filled with a heat medium such as water.
This solves engine noise and also
A system has been devised in which a heat medium is heated by exhaust heat or the like and used as a heat source for hot water supply, etc. However, in such a system, the driven equipment driven by the engine, such as the compressor, is exposed to the outside, and the mounting plate of the compressor, etc., is exposed to the atmosphere along with a part of the engine. , Engine noise leaks directly to the outside through this part, so it is not perfect as a noise countermeasure.

Therefore, the applicant first proposed a method in which the driven equipment driven by the engine is covered with a soundproof case, thereby reducing not only the mechanical noise of the driven equipment but also the intake and exhaust noise of the engine. did. Although this product has significantly reduced overall noise compared to conventional products, the noise from the soundproof case has not been completely eliminated. In this case, if a soundproofing case is used, for example, a soundproofing material or a viscoelastic material is attached to the inner or outer surface of a heavy board made of ferrite or lead, the soundproofing effect will be higher, but the problem is that it is difficult and expensive to install. remains.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to provide a sound damping device that is highly effective in soundproofing and silencing and is inexpensive.

Therefore, in the present invention, in an engine drive system in which a driven device is driven by an engine and a heating medium in a water storage tank is heated by drive exhaust heat of the engine, the driven device is covered with a soundproof case, and the driven device is covered with a soundproof case. In addition to shielding the operating noise of the soundproof case, the driven equipment and engine covered with this soundproof case are placed in the water storage tank so as to be entirely immersed in the heat medium, and are surrounded by multiple layers of materials with different vibration damping characteristics. The drive noise of the engine and the mechanical noise of the driven equipment are further reduced, and by supporting the driven equipment and the engine on the inner peripheral wall of the water tank via a vibration isolating material, the noise is propagated to the water tank through the supporting part. It further improves soundproofing by blocking vibrations from the engine and driven equipment and reducing noise generated by vibrations on the surface of the water tank exposed to the outside. Furthermore, the intake air of the engine is conducted into the inside of the soundproof case, and the sealed driven equipment is appropriately cooled to prevent overheating and the like, and intake noise is muffled. The present invention aims to achieve the above objects through these means.

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 body 2 filled with a heat medium (water in this example), and a sealing material 3 made of elastic rubber inserted into the top opening of this tank body 2. It is composed of a lid body 4 that is removably fitted.

Inside the tank body 2, a support plate 6 is supported substantially horizontally at a slightly upper portion of the inner circumferential wall of the tank body 2 via a vibration isolating material 5 made of elastic rubber or the like. The support plate 6 has an engine 7 immersed in the heating medium on its lower surface, and a driven device on its upper surface that is driven by the engine 7 and whose periphery is hermetically covered by a soundproof case 8. A compressor 9 is attached to each. The soundproof case 8 includes a vibration damping plate 11 attached to the upper surface of the support plate 6 via a plurality of bolts 10 so as to cover the periphery of the compressor 9, and a vibration damping plate 11 uniformly arranged on the inner surface of the vibration damping plate 11. It is composed of a sound absorbing material 12 having heat insulating properties attached thereto, and prevents the heat medium from penetrating into the interior when it is located below the liquid level of the heat medium. Here, as the damping plate 11, a heavy plate, for example, a composite plate of ferrite, lead, rubber, etc. is used. Further, as the sound absorbing material 12, for example, asbestos, glass wool, urethane, honeycomb core, or the like is used. A guide tube 14 is integrally formed on the upper surface of the damping plate 11, and projects outward through an opening 13 formed in the lid 4, and communicates the outside with the inside of the soundproof case 8. ing. A filter 15 is housed inside the guide tube 14, and a sealing material 16 made of elastic rubber is fitted between the outer periphery of the guide tube 14 and the opening 13.

On the other hand, the other end of an intake pipe 21 whose one end protrudes into the soundproof case 8 through the support plate 6 is connected to the intake port side of the engine 7, and the intake air of the engine 7 is connected to the soundproof case 8. The compressor 9 is cooled by the intake air that passes through the interior and the filter 15, and reduces intake noise. An intake noise silencing path is configured.

Further, on the exhaust port side of the engine 7, the other end of an exhaust pipe 22 is immersed in the heat medium in the middle and has one end projecting to the outside through the support plate 6 and the filter 15 of the soundproof case 8. is connected. In the middle of the exhaust pipe 22, there is a radiator 2 that releases exhaust heat from the engine 7 into the heat medium of the tank body 2.
3. A drain pot 25 and a muffler 26 are provided in this order, from which the drain pipe 24 is drawn out from the tank body 2. As a result, when the engine 7 is driven, exhaust heat from the engine 7 is transferred to the radiator 2.
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 9. In the heat pump circuit 31, a pipe 32 from one connection port side of the compressor 9 passes through the support plate 6 and connects to the heat exchanger 3.
3, a pipe 34 from the other end of the heat exchanger 33 passes through a seal 35 provided on the support plate 6 and the lid 4 to an expansion valve 36, and a pipe 37 from the expansion valve 36 passes into the chamber. On one end side of the inner heat exchanger 38,
Pipes 39 from the other end of the heat exchanger 38 pass through the filter 15 of the soundproof case 8 and are connected to the other connection port of the compressor 9, respectively.

Next, the operation of this embodiment will be explained. Now, when the compressor 9 is driven by starting the engine 7, the heat pump circuit 31 is activated, and the heat medium in the water tank 1 is heated by a known refrigeration cycle, or the room is cooled.

On the other hand, when the engine 7 is started, the engine 7
As the temperature of the engine 7 gradually increases, the exhaust gas from the engine 7 is discharged to the outside through the exhaust pipe 22. Then, the heat generated by the temperature rise of the engine 7 is absorbed directly, and the exhaust heat from the engine 7 is absorbed by the heat medium in the water storage tank 1 via the radiator 23. As a result, the temperature of the heat medium in the water storage tank 1 is increased not only by heat generation from the engine 7 and exhaust heat from the engine 7, but also by heat radiation from the heat pump circuit 31. The heat medium can be used as a heat source for hot water supply and space heating.

Therefore, according to this embodiment, the compressor 9 is driven by the engine 7 to perform cooling, and at the same time, the heat medium in the water storage tank 1 is heated using heat generated from the engine 7, 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 can perform cooling, heating, and hot water supply.

In addition, the compressor 9 is covered with a soundproof case 8, and the compressor 9 and engine 7 are immersed in the heat medium in the water storage tank 1 and placed so as to be completely surrounded by the heat medium. Therefore, the mechanical noise of the compressor 9 and the driving noise of the engine 7 can be reduced. In particular, since the area around the compressor 9 is doubly surrounded by the heat medium with different damping characteristics and the soundproof case 8, the sound insulation effect is improved. Extremely high. In this embodiment, a soundproof case 8 with a sound absorbing material 12 attached to the inner surface was used.
In particular, a high soundproofing effect can be achieved even without attaching a sound absorbing material or a viscoelastic material to the inner or outer surface, so it can be manufactured at a low cost. Of course, if the sound absorbing material 12 is applied, it is obvious that noise can be reduced by its sound absorbing effect. Furthermore, housing each device in the water tank 1 eliminates any external protrusions, which is advantageous in terms of space when unitizing and installing the devices.

In addition, the intake air of the engine 7 is conducted to the intake silencer path in the soundproof case 12 to muffle the sound, and the exhaust air of the engine 7 can be muffled by the muffler 26. Therefore, the intake and exhaust noise caused by the operation of the engine 7 can be made with a simple structure. can be reduced. At this time, the compressor 9 sealed within the soundproof case 12 can be appropriately cooled by the conducted intake air, and overheating etc. can be prevented.

Furthermore, since the support plate 5 to which the engine 7 and compressor 9 are attached is supported inside the tank body 2 via the vibration isolating material 5, the lid body 4 can be made of a relatively thin film, which reduces costs. In addition, the vibration isolating material 5 can absorb mechanical vibrations caused by the driving of the engine 7 and compressor 9, thereby preventing noise caused by the mechanical vibrations.

Further, since the weight of the engine 7, compressor 9, etc. is reduced by the buoyancy of the heat medium in which they are immersed, the load on the vibration isolator 5 supporting the engine 7, etc. can be reduced. Therefore, the vibration isolating material 5 can be simplified, and the vibration damping effect can be effectively exhibited without impairing the flexibility of the vibration isolating material 5.

In the above embodiment, the volume of the soundproof case 8 is variable, for example, by a bellows-like structure that can be expanded and contracted in the vertical direction, and the volume of the soundproof case 8 is changed according to the natural frequency of the equipment such as the compressor 9. If set, it is possible to particularly absorb noise components based on the natural frequency of equipment such as the compressor 8. In this case, the sound absorbing material 12 is preferably a viscoelastic material such as asphalt.

In addition, two rooms partitioned from each other are configured in the soundproof case 8, and the intake side of the engine 7 is connected through one of the rooms, and the intake side of the engine 7 is connected through the other room.
The muffler 26 can be omitted by communicating the exhaust side of each with the outside.

On the other hand, in the above embodiment, the compressor 9 and the engine 7 covered with the soundproof case 8 are connected to the water tank 1.
However, these supporting means are not limited to the above example, and any one of the soundproof case 8, compressor 9, and engine 7 can be attached to the water storage tank 1. It may be supported at any arbitrary position. for example,
As shown in FIG. 2, the support plate 6 and the soundproof case 8
A locking claw 42 provided on this soundproof case 41 constitutes a sealed box-shaped soundproof case 41 that is integrated with
A similar effect can be obtained even if the structure is suspended from a holding claw 43 provided on the lower surface of the lid body 4 via a vibration isolating material 44 such as elastic rubber. Furthermore, in this case, by removing the lid 4 from the tank body 2, the soundproof case 41, compressor 9, and engine 7 can be lifted out of the tank body 4, making it easier to clean the inside of the tank body 1. There are advantages.

Note that the present invention is not limited to the heat pump described in the above embodiment, but can also be applied to any device driven by an engine, such as a generator or a pump.

As described above, according to the present invention, it is possible to provide a sound damping device that has a high soundproofing effect and is inexpensive.
Operation noise can be blocked by the soundproof cover, and the heat generated by each operation can be cooled by the engine intake air.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing another embodiment of the present invention. 1...Water tank, 7...Engine, 5,44...
Vibration isolation material, 8, 41...Soundproof case, 15, 21...
...A filter and an intake pipe forming an intake noise-muffling path in a soundproof case, 9...A compressor as a driven device.

Claims (1)

[Scope of Claims] 1. An engine drive system that drives a driven device by an engine and heats a heat medium in a water storage tank using drive exhaust heat of the engine,
The driven equipment is covered with a soundproof case, and the driven equipment and the engine covered with the soundproof case are placed in the water storage tank so that the whole is immersed in the heat medium, and the driven equipment and the engine are placed in the water storage tank. It is supported on the inner peripheral wall of the tank via vibration isolating material, and
A silencer for an engine drive system, characterized in that an intake silencer path is formed in the soundproof case to conduct the intake air of the engine to muffle intake noise and cool the driven equipment. 2. In claim 1, the water tank is composed of a tank main body with an open upper end and a lid attached to the upper end opening of the tank main body, and the driven equipment and the engine are A noise damping device for an engine drive system, characterized in that it is supported on the lower surface of a lid via a vibration isolating material.