JPS644057B2 - - 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 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 this 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, the liquid fills the upper end opening of the water storage tank filled with the engine-driven heat medium that drives the driven equipment by the engine and heats the heat medium in the water storage tank using the drive exhaust heat of the engine. A closed space is formed inside the lid body surrounded by the heating medium and liquid, and the upper and lower surfaces of the holding frame are floated above the surface of the heating medium liquid in this sealed space. By locating the driven equipment and the engine in the heat medium, the engine is immersed in the heat medium to recover waste heat, and the driven equipment and engine are surrounded by the heat medium and liquid to reduce mechanical noise during operation. Cut off. In addition, the holding frame is moored to the lid body by the mooring means, allowing displacement and vibration of the holding body, blocking the propagation of operational vibrations from driven equipment and the engine, and suppressing vibrations of the lid body with the liquid inside the lid body. to prevent noise generation from the lid body. Furthermore, by supporting the lid on the water tank through a vibration isolating material, vibrations from driven equipment and the engine that propagate to the water tank through the lid are more reliably isolated, and vibrations from the sides of the water tank, etc. Prevent noise generation. According to the present invention, a sound damping device with high soundproofing and sound damping effects can be obtained at a low cost without using a sound absorbing material, a viscoelastic body, or the like.

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

In the figure, a heat medium (water in this embodiment) is stored inside a water storage tank 1 whose top surface is open, and a support member 2 is attached to a slightly upper position on the inner circumferential wall. On the support member 2, the lower end edge of a lid 4 that closes the upper opening of the water tank 1 is placed together with a seal ring 3 made of elastic rubber fitted to the upper end edge of the water tank 1.

The tank body 4 includes an outer wall plate 5 having an inverted U-shaped cross section and whose lower end edge is placed on the supporting member 2, and this outer wall plate 5.
The inner wall plate 6 is disposed along the inner side of the inner wall plate 6, and the inner wall plate 6 is formed into a bottomed cylindrical shape with a double wall structure having a space 7 filled with a liquid such as water. A bellows tube 8 with both ends open is fitted between the horizontal upper surfaces of the outer wall plate 5 and the inner wall plate 6. Inside the bellows tube 8 is a filter 1 that introduces outside air into a closed space 9 partitioned by the lid 4 and the heat medium in the water storage tank 1.
0 is stored. Further, the outer wall board 5 includes:
An elastic material 11 such as rubber is attached as a vibration isolating material to the lower edge placed on the support member 2, and a valve 12 for discharging the air in the space 7 to the outside is provided on the horizontal part of the upper surface. It is being Further, in the inner wall plate 6, a lower horizontal portion immersed in the heating medium in the water storage tank 1 is provided with a communication hole for introducing the heating medium into the space 7 when the air in the space 7 is discharged to the outside. 13 is bored, and a bottomed cylindrical holding frame 15 with an open top side is suspended from the inner surface of the vertical portion via a hanging tool 14 serving as a mooring means. An engine 16 immersed in the heating medium is attached to the lower surface of the holding frame 15, and a compressor 17 as a driven device driven by the engine 16 is attached to the inner upper surface.

The engine 16 has an intake pipe 21 having one end connected to the intake port and the other end of which protrudes into the space 9 through the bottom wall of the holding frame 15, and an intake pipe 21 having a middle end connected to the exhaust port. It is immersed in the heating medium, and one end is connected to the bottom wall of the holding frame 15 and the lid 4.
The other end of an exhaust pipe 22 that passes through the inside of the filter 10 and projects to the outside is connected to the exhaust pipe 22 . A radiator 23 and a drain pipe 2 are disposed in the middle of the exhaust pipe 22 to release exhaust heat from the engine 16 into the heat medium of the water storage tank 1.
A drain pot 25 and a muffler 26 are provided in this order.
Thereby, when the engine 16 is driven, exhaust heat from the engine 16 is released from the radiator 23, and as a result, the heat medium in the water storage tank 1 is heated.

Further, a known heat pump circuit 31 is connected to the compressor 17. In the heat pump circuit 31, a pipe 32 from one connection port of the compressor 17 passes through the bottom wall of the holding frame 15 to one end of the heat exchanger 33, and a pipe 34 from the other end of the heat exchanger 33 passes through the bottom wall of the holding frame 15. A pipe 37 from the expansion valve 36 passes through the seal ring 3 to the expansion valve 36 , a pipe 37 from the indoor heat exchanger 38 passes through the seal ring 3 , a pipe 39 from the other end of the heat exchanger 38 connects to the seal ring 3 and the heat exchanger 38 . They are respectively connected to the other connection port side of the compressor 17 through the bottom wall of the holding frame 15.

Next, the operation of this embodiment will be explained. Now, when the compressor 17 is driven by starting the engine 16, the heat pump circuit 31 is activated, and the heat medium in the water storage tank 1 is heated by a known refrigeration cycle.
Alternatively, the room is cooled.

On the other hand, when the engine 16 is started, the temperature of the engine 16 is gradually increased, and exhaust gas from the engine 16 is discharged to the outside through the exhaust pipe 22. Then, the heat generated by the temperature rise of the engine 16 is absorbed directly, and the exhaust heat from the engine 16 is absorbed by the heat medium in the water storage tank 1 via the radiator 23. As a result, the heat medium in the water tank 1 is
In addition to the heat generated by the engine 6 and the exhaust heat from the engine 16, the temperature is increased by heat radiation from the heat pump circuit 31, so the heat medium heated by this can be used as a heat source for hot water supply and space heating. I can do it.

In addition, in order to seal water in the space 7 of the lid body 4,
By connecting a vacuum pump or the like to the valve 12 and reducing the pressure in the space 7 with the vacuum pump, the heat medium in the water storage tank 1 can be injected into the space 7 through the communication hole 13 according to the siphon principle.

Therefore, according to this embodiment, the compressor 17 is driven by the engine 16 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 16, 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 engine 16 and the compressor 17 are housed in the water tank 1, the engine 16 is immersed in the heat medium in the water tank 1, and the top opening of the water tank 1 is closed by a lid 4 with water sealed inside. Since it is closed, the driving noise of the engine 16 and the mechanical noise of the compressor 17 can be insulated by the heat medium in the water storage tank 1 and the water in the lid 4. In particular, the surroundings of the compressor 17 are surrounded by inner and outer wall plates 5 and 6 having different damping characteristics. Since it is surrounded by a three-layer structure with water, an extremely high sound insulation effect can be obtained.
Moreover, since the communication hole 13 and the valve 12 are provided in the lid body 4, if the valve 12 is connected to a vacuum pump or the like and the pressure inside the space 7 of the lid body 4 is reduced by the vacuum pump, heat is generated through the communication hole 13. The heat medium is sucked up into the space 7, and when the lid body 4 is attached or removed, the water inside is removed and the weight is reduced, making it easier to handle. Can be enclosed.

Furthermore, since the intake side of the engine 16 is communicated with the outside through the space 9 partitioned by the heat medium in the water storage tank 1 and the lid 4, and the exhaust side muffler 26 is provided, the space 9 can be used as a muffler. As a result, the intake and exhaust noise of the engine 16 can be reduced without particularly providing a noise reduction means on the intake side.

Furthermore, since the holding frame 15 to which the engine 16 and compressor 17 are attached is suspended from the lid 4 via the hanging tool 14, when the lid 4 is removed from the water tank 1,
Engine 16, compressor 17 and holding frame 1
5 can be pulled up from inside the water storage tank 1, cleaning etc. of the inside of the water storage tank 1 can be easily performed. Moreover, the lid 4 is placed on the support member 2 of the water storage tank 1, and the elastic material 11 is provided on the lower edge of the lid 4 placed on the support member 2.
is moored above the liquid surface of the heating medium by the hanging device 14 and configured to tolerate vibration and displacement, so mechanical vibrations of the engine 16 and compressor 17 are prevented by double vibration isolation by the hanging device 14 and the elastic material 11. The structure prevents vibration noise from coming from the sides of the water tank 1, thereby improving quietness. Here, the lid body 4, which is a vibration transmission path, is more likely to generate vibration noise than the water tank 1, but since it faces the top and has a small surface area, the influence of vibration noise is small, and the inside is not filled. Since vibrations are suppressed by the heat medium, noise generated from the surface can be sufficiently avoided.

In the above embodiment, if the volume of the space 9 is made variable, if the volume of the space 9 is changed and set according to the natural frequency of the equipment such as the compressor 17, the natural frequency of the equipment such as the compressor 17 can be changed. can particularly absorb noise components based on In this case, in order to vary the volume of the space 9, the lid 4 may be moved up and down, for example.

In addition, two chambers partitioned from each other are formed within the holding frame 15, and the intake side of the engine 16 is connected through one of the chambers, and the engine 16 is connected through the other chamber.
The muffler 26 can be omitted if the exhaust sides of the exhaust gases 6 are communicated with the outside.

Furthermore, the shape and support structure of the lid 4 are not limited to the above examples; for example, the shape and support structure of the lid 4 are not limited to the above examples.
The outer wall plate 5 may be made of a film-like soft material as long as the inner wall plate 6 has a retaining property.

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.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention. 1... Water tank, 4... Lid body, 9... Closed space,
DESCRIPTION OF SYMBOLS 11... Elastic material as a vibration isolating material, 14... Hanging tool as a mooring means, 15... Holder, 16... Engine, 17... Compressor as a driven device.

Claims (1)

[Scope of Claims] 1. In 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 upper surface side of the water storage tank filled with the heat medium. A double-structured lid is provided in the opening of the water tank, which has a cylindrical shape with an open bottom and is filled with liquid, and this lid is supported on the inner circumferential wall of the water tank via a vibration isolating material. , the lower edge thereof is immersed in the heating medium in the water storage tank to form a sealed space surrounded by a lid and the liquid level of the heating medium, and a bottomed cylindrical holding having an open top side in the sealed space; A frame is provided, and this holding frame is moored above the liquid surface of the heating medium by a mooring means provided inside the lid body, and the driven device is provided above the holding frame and sealed in the sealed space. A silencer for an engine drive system, characterized in that the engine is provided below the holding frame and immersed in the heat medium. 2. In claim 1, a communication hole is provided in a portion of the lid that is immersed in the heating medium, and the liquid inside the lid flows into the water storage tank through the communication hole. A silencer for an engine drive system, characterized in that it is a heat medium.