JPS6181559A - Noise suppressor for engine driving system - Google Patents

Abstract

PURPOSE:To obtain a less noisy device by placing an engine in a water vessel, supporting said engine by said water vessel body via a vibration isolating material, while supporting said water vessel body in a casing leaving a space, in a heat pump in which a compressor is driven by means of said engine. CONSTITUTION:An engine 18 which drives the compressor 17 of a heat pump, is suspended from a supporting plate 16 which is fixed to a cover body 13, via a vibration isolating material 14, on the upper part of a water vessel 3 containing water 19, and the compressor 17 is placed on the top of the plate 16. The water vessel 3 is supported by a casing 1 via vibration isolating materials 5, 9. The intake air of an intake air pipe 20 is burned in the engine 18, and its exhaust gas is discharged via a pipe 21. The waste heat of the engine is stored in the water in the water vessel, and serves as the heat source for operating the heat pump. Since the engine is supported by the water vessel 3 via the vibration isolating material and the water vessel 3 is supported by the casing 1 via the vibration isolating materials and leaving a space, the noise will not heard outside.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention stores an engine inside a tank body filled with a heat medium such as water, and utilizes the drive exhaust heat of the engine to store heat in the heat medium. The present invention relates to an engine drive system, and particularly to a silencer for preventing noise.

[Background Art and Problems Therewith] 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 order to prevent this noise and to effectively utilize the driving heat and exhaust heat of the engine, we immersed the engine in a tank body filled with a heat medium such as water, thereby solving the engine noise and , a system was 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, such a system is not perfect as a noise countermeasure because the driven equipment, such as the compressor, which is driven by the engine is exposed to the outside. Further, since the engine is directly fixed to a part of the body 41, vibrations caused by the engine drive are transmitted to the outside through the tank body, resulting in noise caused by the vibrations, which is a problem.

Therefore, a device has been proposed in which the engine is attached to the tank body via a vibration isolating material to cut off vibration transmission from the engine to the tank body, and the upper part of the engine is covered with a case to reduce noise. ing.

However, even with this device, it cannot exhibit any noise reduction effect on the noise generated when the tank body acts as a secondary vibrator, and it is not always possible to obtain a sufficient noise prevention effect. It is something that cannot be done. As described above, none of the conventional devices has been able to obtain sufficient effects in noise prevention.

[Object of the Invention] The present invention was made in consideration of the above-mentioned facts, and provides an engine-driven system that enables more complete noise prevention by blocking the noise generated when the tank body acts as a secondary vibrator. The purpose is to provide a sound deadening device.

[Means and effects for solving the problem] In order to solve the above-mentioned problem, in the present invention, an engine is installed inside a tank body containing a heat medium such as water, and the engine is driven. In an engine drive system that uses waste heat to store heat in a heat medium of the tank body, the engine is supported on the tank body via at least a vibration isolating member, and the tank body is connected to the outer surface of the tank body on a casing. It is housed so that an air layer is formed between it and the casing.

As a result, since the engine is supported by the tank main body via the vibration isolating member, its vibrations are not directly transmitted to the tank main body.

In addition, even if the vibration of the engine described in tJ is indirectly propagated to the tank main body, and the tank main body becomes a secondary vibrating body and noise is generated, the noise is generated between the tank main body and the casing. It is attenuated by the air tank and is blocked by the casing, so that the discharge to the outside is almost completely blocked.

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

Figure 1 shows the whole of this embodiment. In the figure, 1 is a bottomed cylindrical casing made of a material with high sound insulation performance such as a steel plate, and the inner surface of this casing 1 is made of glass wool or other material. A tank body 3 is accommodated in the casing 1, on which a heat-insulating and sound-absorbing member 2 made of material is attached.

That is, the tank body 3 is a cylindrical body having an outer diameter smaller than the inner diameter of the casing 1 by a predetermined size, and a large diameter portion 4 is formed near the upper opening of the tank body 3.
A ring-shaped sound absorbing member 5 made of elastic rubber or other soft vibration isolating material is interposed between the outer surface of the casing L and the inner surface of the casing l, so that the tank body 3 is supported within the casing while being acoustically isolated. has been done.

Moreover, the tank body 3 has a plurality of holes 7 provided at the bottom of the casing l. . . , a vibration isolation member 9 made of rubber or other material provided between the bottom outer surface of the tank main body and the installation surface 8 through 7. ..., 9 so that the load flows to the installation surface 8, and is completely isolated from the casing from both vibration-proof and acoustic aspects.

Therefore, the tank main body 3 is housed in the casing 1 while being acoustically isolated, and an air layer 10 is formed between the outer surface of the tank main body 3 and the inner surface of the casing 1.

Next, a ring-shaped vibration isolating member 12 made of elastic rubber or the like that serves as a vibration damper and a seal is attached to a stepped portion 11 formed from below toward the large diameter portion 4 in the upper part of the tank body 3.
is placed, and the stepped portion 11 is placed with the vibration isolating member 12 interposed therebetween.
A support ring 13 in the form of a perforated disk is attached to i! i! 2 has been done.

A support plate 16 is attached to the inner hole of the support ring 13 via a vibration isolating member 14 such as elastic rubber.
A compressor 17 is fixed on the upper surface of the support plate, and an engine 18 for driving the compressor 17 is fixed on the lower surface.

The tank body 3 is filled with water or other heat medium 19, and the engine 18 is immersed in the heat medium 19.

Further, the engine 1 is provided on the upper surface of the support plate 16.
8 intake pipes 20 are installed upright, and the exhaust pipe 2 of the engine 18 is installed vertically.
1 is connected below the engine, passes through the heat medium 19, and is configured such that its open end projects onto the upper surface of the support plate 16.

Note that the exhaust pipe 21 is equipped with a radiator 22 and a drain pipe 23.
is installed, so that the exhaust heat emitted from the engine 18 is efficiently released into the heat medium 19, and the water produced by condensation of moisture contained in the exhaust gas is discharged to the outside.

Further, a known heat pump circuit 24 is connected to the compressor 17.

The heat pump circuit 24 includes a first heat exchanger 25 installed outside, a fan 26 for promoting heat exchange in the heat exchanger, an expansion valve 27 . It consists of a second heat exchanger 28 immersed in the heat medium 19, piping 29 connecting these, and a four-way valve (not shown) for switching the circulation direction, forming a closed circuit.

Next, a shelf 30 is provided around the upper open end of the casing 1, and extends slightly horizontally toward the inner circumference. A soundproof cover 32 is removably attached.

That is, the soundproof cover 32 is a cylindrical body whose upper surface is sealed and whose lower surface is open, and a large diameter portion 33 having an inner diameter slightly larger than the outer diameter of the casing l is provided at the lower open end. The large diameter part is fitted into the casing, and the vibration isolating member 31 is interposed between the step part 34 formed from the upper part to the large diameter part and the shelf part 30 of the casing 1. It is something that exists.

The inside of the soundproof cover 32 is partitioned by partition members 35 and 36, and the compressor 17 is housed in a room 37 at the center in the figure, and the intake pipe 20 is housed inside a room 38 on the left side of the drawing. is erected, and the exhaust pipe passes through a through hole 39 provided on the upper surface of the soundproofing force/< -32, and has its open end protruding to the outside. An exhaust port 40 is bored in the contacting side surface.

On the other hand, the open end of the exhaust pipe 21 is protruded inside the room 41 on the right side of the soundproof cover 32 in the drawing, and
The partition members 35 and 36 are provided with communication pipes 42 and 43 that communicate the adjacent rooms 41 and 37 and 37 and 38, respectively, and the exhaust gas discharged from the open end of the exhaust pipe 21 is passed through these pipes. It passes through each room through a communication pipe and is discharged to the outside from the exhaust port 40.

Note that a sound absorbing member 44 such as glass wool is adhered to the entire inner wall surface of the soundproof cover 32.

Furthermore, vibration-proofing seal members 45 and 46 formed of elastic rubber or the like are fitted to the lower edges of the partition members 35 and 36, and are fitted into grooves 47 and 48 provided in the support plate to provide vibration-proofing. And a seal is made.

Next, a soundproof case 49 is provided on the upper surface of the soundproof cover 32.
is removably installed.

That is, the soundproof case 49 is a cylindrical body whose upper surface is sealed and whose lower surface is open. A bent flange portion 50 is formed, and a plurality of ports 51. . . , 51, which are removably installed.

Further, the entire inner wall surface of the soundproof case 49 is coated with a sound absorbing member 52 such as glass wool, and an air intake port 53 is provided on the right side of the page.

Note that the open end of the intake pipe 20 protrudes inside the soundproof case 49, so that air necessary for driving the engine 18 is taken in through the intake port 53.

Further, as shown in FIG. 2, a lip seal 54 made of a vibration-proof sealing material such as elastic rubber is attached to the hole 39 through which the intake pipe 20 passes, thereby providing vibration-proofing and sealing.

Furthermore, although not shown, the portions where the piping 24 of the heat pump circuit 24 and the drain pipe 23 connected to the exhaust pipe 21 penetrate the corresponding members are each sealed using a vibration-proof sealing material in the same manner as described above. It has been shaken and sealed.

Next, the operation of this embodiment will be explained.

Now, when the engine 18 is started, the compressor 17 is driven, the heat pump circuit 24 is activated, and the heat medium 19 is activated.
When storing heat in the heat exchanger 2, the heat exchanger 25 is used as an evaporator.
Since the heat is condensed and radiated at step 8, the temperature of the heat medium 19 rises.

On the other hand, when the engine 18 starts, the temperature of the main body itself rises, and the exhaust pipe 21 is heated by the exhaust heat of the engine.
is heated and the heat is released to the heat medium 19 by the radiator 22, so that the temperature of the heat medium 19 further increases.

The heat medium heated in this manner is used as a heat source for hot water supply and space heating, and energy is effectively utilized.

In this case, when the engine is started, the engine body and parts mechanically coupled thereto vibrate violently.

In this embodiment, the support plate 16 supporting the engine 18
is attached to the support ring 13 via the vibration isolating member 14, so the vibrations of the engine 18 are not directly transmitted to the support ring 13.

In addition, since the support ring 13 is also placed on the tank body 3 via the vibration-proof sealing member 12, even slight vibrations transmitted to the support ring will not be transmitted to the tank body 3. Since the load 3 is supported by the installation surface 8 via the vibration isolating member 9, the vibration of the tank body 3 is not transmitted to the installation surface.

Further, much of the noise generated from the engine 18 is caused by the heat transfer medium 19.
However, part of the noise is propagated to the tank body 3, and as a result, the tank body 3 becomes a secondary vibrating body and new noise is generated.

However, this noise is attenuated by the air layer 10 and absorbed by the heat-insulating sound-absorbing member 2, and is blocked by the casing 1 so that it does not reach the outside. 3
It also has the effect of effectively retaining heat. Note that since the tank body 3 is supported by the casing 1 via the vibration isolating member 5, vibrations are not directly transmitted to the casing l.

On the other hand, the noise generated from the engine 18 is absorbed by the support plate 16.
Although the noise is also emitted above the support plate through the compressor 17 and the like, this noise is also attenuated and absorbed by the soundproof cover 32 and the soundproof case 49, and almost never reaches the outside.

In addition, the soundproof cover 32 is placed on the casing 1, which hardly vibrates, and is acoustically separated from the tank body 3, which is a secondary vibrator, so that vibrations occur due to direct transmission. Not at all.

Furthermore, the noise of the engine 18 is also emitted to the outside through the intake pipe 20 or the exhaust pipe 21, and in this case, the noise emitted from the exhaust pipe 21 is particularly large.
The open end of the intake pipe 20 protrudes into the soundproof case 49, and the open end of the exhaust pipe 21 extends into the right room 41 inside the soundproof cover 32.
Because they protrude inward, they are attenuated and absorbed and do not reach the outside.

That is, the room 41. of the soundproof cover 32 passes through the exhaust pipe 21.
Communication pipe 42, room 37, communication pipe 43, room 38. This is because sound energy is attenuated due to diffusion and aperture effects while it is flowing through the air.

In addition, the intake air of the engine is performed from the intake port 53 of the soundproof case 49 as shown by arrow A in FIG. The air flows through the air one after another, and is then discharged to the outside from the exhaust port 40. That is, the soundproof cover simultaneously functions as an intake silencer and an exhaust silencer.

In this way, according to this embodiment, engine noise is removed very effectively, so there is no need to take any other measures to prevent noise, and the installation location can be arbitrarily selected.

In the above embodiment, the engine 18 is supported by the support plate 1.
6, the support plate is attached to the support ring 13 via the vibration isolation member 14, and this support ring 13 is placed on the tank body 3 via the vibration isolation member 12, but this has the following configuration. It's okay as well.

That is, as shown in FIG. 3, the engine 18 is attached to a support plate 16A provided with an engine attachment part, and a bracket 55 is fixed to multiple locations on the support plate 16A with bolts 56, and the tip of the bracket 55 is made of elastic rubber. It may be attached to the upper part of the tank body 3 with bolts 58 through a vibration isolating material 57. In this case, the bolts 58 are used to prevent displacement in the circumferential direction due to engine vibration, etc. There is no need to tighten the bracket 55 and the vibration isolating effect of the vibration isolating material 57 can be prevented from being reduced due to tightening.

Even if the engine 18 is supported with such a configuration, the vibration isolating material 57 can exhibit the same effect as the vibration isolating material 14 of each of the above embodiments, and the vibration of the engine 18 is not transmitted to the tank body 3, and sufficient vibration is maintained. Can perform vibration and soundproofing.

Further, as shown in FIG. 4, a flange portion 59 may be integrally formed on the support plate 16B, and the flange portion 59 may be used to support the tank body 3. In this case, the vibration isolating material 57 may be attached to the support plate 16B. It may be interposed on the 16B side, and in this way, the engine 18 can be supported by sinking deeper into the tank body 3, and the height of the soundproof cover 32 can be lowered. Further, in this embodiment as well, a vibration isolating material 57 may be interposed between the tank body 2 and the bracket 55 as in the embodiment shown in FIG.

Furthermore, as in the embodiment shown in FIG. 5, the flange portion 59 of the support plate 16B may be directly supported on the upper part of the tank body 3 via the vibration isolating material 57A. In this case, the vibration isolating material 57A is in the form of pieces. The shape is not limited to this, and may be a ring shape, or even a hollow ring shape (tube shape). In this way, if the vibration isolating material 57A is provided around the entire circumference, a sealing effect can be expected, and it is also useful for soundproofing the auxiliary equipment on the upper surface of the support plate 16B.

In addition, as shown in FIGS. 6 and 7, arms 60A are provided on three sides.
It may be supported using a ring-shaped suspension arm 48 having a diameter.

Furthermore, as shown in FIGS. 8 and 9, a perforated disk-shaped support ring 13A is placed on the top of the tank body 3, and a vibration isolating material 57. The support plate 16A may be supported via the bracket 55.

With this configuration, the area as a sound source is reduced to approximately the area of the support plate 16A, similar to the previous embodiment, and the soundproofing effect can be increased. Further, even if the sizes of the support plate 16A, the gradient 55, etc. are kept constant, the present invention can be applied to tank bodies 2 of different sizes by simply using an appropriate support ring 13A. Furthermore, since the support plate 16A does not need to be made large, the support plate 16A, which tends to be complicated to process, can be made inexpensive. In this case, the support ring 13A is separated from the engine 18 by the vibration isolating material 57.
It goes without saying that it is desirable to use a material with a large mass, such as a thick steel plate, in terms of vibration isolation.

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. Also, the support plate 16, 16A or 16B is not necessarily required! Instead, the engine 18 may be supported by the tank body 3 by directly attaching the bracket 55 to the engine 18. In this case, it goes without saying that a vibration isolating material is interposed between the engine 18 and the tank body 3. .

[Effects of the Invention] As detailed above, according to the present invention, in the engine drive system, since the engine is attached to the tank body via the vibration isolating material, direct transmission of engine vibration to the tank body is prevented. At the same time, since the tank body is housed in the casing so that an air layer is formed between the outer surface of the tank body and the inner surface of the casing, air is indirectly propagated from the engine and the tank body becomes secondary. Noise generated by the vibrating body is also attenuated and blocked by the air layer casing and effectively removed.

Therefore, it is possible to provide an extremely effective muffling device for an engine drive system.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view showing a seal structure when the intake pipe 20 in FIG. 1 penetrates the soundproof cover 32, and FIGS. 3 to 6 are main part sectional views showing different modifications of the engine support structure,
FIG. 7 is a perspective view of a suspension arm used in the modification of FIG. 6, FIG. 8 is a sectional view of a main part showing still another modification of the engine support structure, and FIG. 9 is a modification of FIG. 8. FIG. 3 is a perspective view of a support ring used in FIG. ■... Casing, 3... Tank body, 10... Air layer, 12.57... Vibration isolating member, 18... Engine,
19...Heating medium.

Claims (1)

[Claims] (1) In an engine drive system in which an engine is installed in a tank body containing a heat medium such as water, and exhaust heat from the engine is used to store heat in the heat medium, the engine is provided with a vibration isolating member. A noise reduction system for an engine drive system, characterized in that the tank body is supported by the tank body through the tank body, the tank body is housed in a casing, and an air layer is formed between the tank body outer surface and the casing inner surface. Device.