JPH0429864B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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 Therein] Conventionally, so-called engine heat pumps have been known in which, for example, a heat pump compressor is driven by an engine. 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. , 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 driven equipment driven by the engine, such as the compressor, is exposed to the outside. Furthermore, since the engine is directly fixed to a part of the tank body, vibrations caused by the engine drive are transmitted to the outside through the tank body, resulting in a problem of noise caused by the vibrations.

Therefore, by attaching the engine to the tank body through a vibration isolating material, vibration transmission from the engine to the tank body is blocked, and at the same time, the upper part of the engine is covered with a case to reduce noise. Proposed.

However, even with this device, it cannot exhibit any noise reduction effect on the noise generated when the tank body acts as a secondary vibrating body, 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 has been made in consideration of the above-mentioned facts, and provides an engine drive system that enables more complete noise prevention by blocking the noise generated when the tank body acts as a secondary vibrating body. The purpose is to provide a sound deadening device for the system.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides an engine installed in a tank body that houses a heat medium such as water inside, and exhaust heat generated by the engine. In this engine drive system, the engine is supported on the tank body only through a vibration isolating member, and the tank body is housed in a casing, and the tank body has an outer surface. At the same time as forming an air layer between the inner surface of the casing and
The outer circumference of the upper opening of the tank body is sealed to the inner circumference of the casing over the entire circumference, and the tank body is supported by the casing only via a vibration isolating member.

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.

Even if the vibrations of the engine are indirectly propagated to the tank body via a heat medium or the like, the vibration isolating member prevents the vibrations of the tank body from being further transmitted to the casing, and the tank body Even if it becomes a secondary vibrating body and generates noise, the noise is attenuated by an air layer formed between the tank body and the casing and sealed around the opening on the upper surface side. At the same time, it is blocked by the casing, and release to the outside is almost completely blocked.

[Example] Hereinafter, an example of the present invention will be described 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 the casing 1 is made of glass wool or other material. A heat-insulating and sound-absorbing member 2 made of a material is applied. Next, a tank body 3 is accommodated within the casing 1.

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. the outer surface of the casing 1
A ring-shaped sound absorbing member 5 made of elastic rubber or other soft vibration damping material is interposed between the inner surface of the casing and the tank main body 3 to be supported within the casing while being acoustically isolated.

In addition, the tank body 3 has a vibration isolating member made of rubber or other material provided between the bottom outer surface of the tank body and the installation surface 8 through a plurality of holes 7, . . . , 7 provided at the bottom of the casing 1. 9, .

Therefore, the tank main body 3 is accommodated 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 isolator 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. The vibration isolating member 1
A support ring 13 in the shape of a perforated disk is placed on the stepped portion 11 with the support ring 2 interposed therebetween.

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

Note that water or other heat medium 19 is provided in the tank body 3.
is filled, and the engine 18 is immersed in the heat medium 19.

In addition, an intake pipe 20 of the engine 18 is erected on the upper surface of the support plate 16, and an exhaust pipe 21 of the engine 18 is connected below the engine and passes through the heat medium 19 to the support plate 16.
The opening end thereof is configured to protrude from the upper surface of the housing.

Note that a radiator 22 and a water drain pipe 23 are attached to the exhaust pipe 21, so that the exhaust heat released from the engine 18 is efficiently released into the heat medium 19, and the moisture contained in the exhaust is removed. The condensed water 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, and a second heat exchanger immersed in the heat medium 19. It consists of a heat exchanger 28, piping 29 connecting these, and a four-way valve (not shown) for switching the direction of circulation, etc., and constitutes 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 to the top.

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 1 is provided at the lower open end. The large diameter part is fitted into the casing, and the vibration isolating member 3 is inserted between the step part 34 formed from the upper part to the large diameter part and the shelf part 30 of the casing 1.
1 is interposed.

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 air intake is inside a room 38 on the left side of the drawing. A pipe 20 is erected, and the exhaust pipe passes through a through hole 39 provided on the upper surface of the soundproof cover 32, and has its open end protruding to the outside, and is in contact with the outside of the room 38. An exhaust port 40 is bored in the side surface.

On the other hand, the room 4 on the right side of the soundproof cover 32 in the paper
1, the open end of the exhaust pipe 21 protrudes inside the partition member 35 and 36, and the partition members 35 and 36 have adjacent rooms 41 and 37 and 37 and 38, respectively.
Communication pipes 42 and 43 are provided to communicate with the exhaust pipe 21, and the exhaust gas discharged from the open end of the exhaust pipe 21 passes through each room through these communication pipes and is discharged to the outside from the exhaust port 40.

Note that a sound absorbing member 44 such as glass wool is attached 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 removably mounted on the upper surface of the soundproof cover 32.

That is, the top surface of the soundproof case 49 is sealed,
It is a cylindrical body with an open bottom surface, and has a diameter slightly smaller than the diameter of the soundproof cover 32, and a flange portion 50 that is slightly bent outward is formed at the periphery of the opening. The soundproof cover 32 is removably mounted with a plurality of bolts 51, .

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

Note that an open end of the intake pipe 20 protrudes inside the soundproof case 49, so that the engine 1
8 is configured so that the air necessary for driving the motor is taken in through the intake port 53.

In addition, the hole 39 through which the intake pipe 20 penetrates,
As shown in FIG. 2, a lip seal 54 made of vibration-proof sealing material such as elastic rubber is attached.
Anti-vibration and sealed.

Furthermore, although not shown, the heat pump circuit 2
The locations where the pipe 24 of No. 4 and the drain pipe 23 connected to the exhaust pipe 21 penetrate the corresponding members are as follows:
Similar to the above, vibration isolating and sealing measures are taken using anti-vibration sealing materials.

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 when heat is stored in the heat medium 19, the heat exchanger 25 is used as an evaporator and the heat is condensed and radiated in the heat exchanger 28, so the temperature of the heat medium 19 rises. do.

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, and the heat is transferred to the radiator 22.
is released to the heat medium 19 by the heat medium 1
9, the temperature further increases.

The heat medium heated in this way is used as a heat source for hot water supply and space heating, and the energy is effectively utilized. The parts vibrate violently.

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

Moreover, 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. Note that since the load of the tank body 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, although most of the noise generated from the engine 18 is attenuated by the heat medium 19, a part of it 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, absorbed by the heat insulating sound absorbing member 2, and is blocked by the casing 1 so that it does not reach the outside. At the same time, the tank body 3 is effectively kept warm by the air layer 10 and the heat-insulating sound-absorbing member 2. Note that since the tank body 3 is supported by the casing 1 via the sound absorbing member 5 using a vibration isolating material, vibrations are not directly transmitted to the casing 1.

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

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 vibrating body, so that vibrations due to direct transmission do not occur. .

Further, the noise of the engine 18 is also emitted to the outside through the intake pipe 20 or the exhaust pipe 21. In this case, the noise emitted from the exhaust pipe 21 is particularly large, but in this embodiment, the open end of the intake pipe 20 is Since the exhaust pipe 21 projects into the soundproof case 49 and the open end of the exhaust pipe 21 projects into the right room 41 inside the soundproof cover 32, it is attenuated and absorbed and does not reach the outside.

That is, the sound energy is attenuated by the diffusion and aperture effect while flowing through the exhaust pipe 21 through the chamber 41 of the soundproof cover 32, the communication pipe 42, the room 37, the communication pipe 43, and the room 38.

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 32 simultaneously constitutes 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 noise prevention measures, and the installation location can be set arbitrarily.

In the above embodiment, the engine 18 is fixed to the support plate 16, the support plate is attached to the support ring 13 via the vibration isolator 14, and the support ring 13 is attached to the tank body 3 via the vibration isolator 12. Although this is shown above, it may also have the following configuration.

That is, as shown in FIG. 3, the engine 18 is mounted on a support plate 16A provided with an engine mounting portion, 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 via 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., and there is no need to tighten the tank body 3 and the bracket 55. It is now possible to prevent the reduction.

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 be used for vibration and soundproofing.

Further, as shown in FIG. 4, the support plate 16B
A flange portion 59 may be formed integrally with the tank body 3, and this flange portion 59 may be used to support the tank body 3. In this case, the vibration isolating material 57 may be interposed on the support plate 16B side, and if this is done, the engine 18
can be supported by being sunk 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 ring-shaped, or even hollow ring-shaped (tube-shaped). In this way, if the vibration isolating material 57A is provided around the entire circumference, the sealing effect can be improved, and the support plate 16
It is also useful for soundproofing the auxiliary equipment on the top of B.

Alternatively, as shown in FIGS. 6 and 7, a ring-shaped suspension arm 48 having arms 60A on three sides may be used for support.

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

With this configuration, the area of the sound source is almost the same as that of the support plate 16A, similar to the embodiment described above.
The soundproofing effect can be increased because it is only a small part. Furthermore, even if the sizes of the support plate 16A, bracket 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, the support plate 16
Since it is not necessary to increase A, the support plate 16A, which tends to be complicated to process, can be made at low cost. In this case, it is natural that the support ring 13A, which is separated from the engine 18 by the vibration isolating material 57, is preferably made of 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. Further, the support plate 16, 16A or 16B is not necessarily necessary, and the bracket 55 is attached directly to the engine 18.
The engine 18 may also be supported by the tank body 3 by attaching the engine 18 to the tank body 3. 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. In addition, since the tank body is supported on the casing via the vibration isolating member, it is possible to block the engine vibrations transmitted to the tank body via the heat medium etc. from being transmitted to the casing. 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, the vibration is indirectly propagated from the engine and the tank body acts as a secondary vibrating body. The air layer casing also attenuates and blocks out noise, thereby effectively removing it.

Therefore, it is possible to provide a very effective muffler for engine drive systems.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure shows that the intake pipe 20 in FIG.
2, a cross-sectional view showing the seal structure when penetrating through the 3rd
6 to 6 are sectional views of main parts 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, and FIG. 8 is a further view of the engine support structure. FIG. 9 is a sectional view of essential parts showing another modification, and is a perspective view of a support ring used in the modification of FIG. 8. DESCRIPTION OF SYMBOLS 1... Casing, 3... Tank body, 5... Sound absorbing member which is a vibration isolation member between the casing and the tank body, 10... Air layer, 12, 14, 57... Between the engine and the tank body vibration isolating member, 18... engine, 19... heat 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 connected to the tank body through a vibration isolating member. The tank body is housed in a casing, and an air layer is formed between the outer surface of the tank body and the inner surface of the casing, and the outer periphery of the upper opening of the tank body is completely extended to the inner periphery of the casing. 1. A silencer for an engine drive system, characterized in that the tank body is sealed around the circumference, and the tank body is supported by a casing only via a vibration isolating member.