JPH0429865B2 - - 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 transfers the drive exhaust heat of the engine to the heat medium in the tank body. The present invention relates to an engine drive system used for heat storage, 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 inside the tank body, which is filled with a heat medium such as water, and thereby solved 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, a device is provided which aims to reduce noise by covering the upper part of the engine with a soundproof cover. Proposed.

However, even with this device, it is not possible to prevent the engine noise from propagating to the tank body via a heat medium, etc., and the tank body becomes a secondary vibrating body due to the propagated noise, which causes the tank body to become a secondary vibrator. The noise is emitted to the outside.

Furthermore, since the soundproof cover is attached to the tank body, vibrations of the tank body are transmitted to the soundproof cover and emitted to the outside. As described above, none of the conventional devices has been able to achieve the desired noise prevention effect.

[Object of the Invention] The object of the present invention was made in consideration of the above-mentioned facts, and it is an object of the present invention to block the noise generated by the tank main body as a secondary vibrating body, and to prevent the vibration of the tank main body from being transmitted to the soundproof cover. It is an object of the present invention to provide a muffling device for an engine-driven system that makes it possible to obtain a more complete noise prevention effect.

[Means and effects for solving the problem] In order to solve the above problem, the present invention provides an engine installed in a tank main body that houses a heat medium such as water inside, and exhaust heat generated by the engine. In the engine drive system, the engine is supported by the tank body through a vibration isolating member, the tank body is housed in a casing, and the engine is supported by the tank body through a vibration isolating member, and the tank body is housed in a casing, and there is a space between the outer surface of the tank body and the inner surface of the casing. forming an air layer, and sealing the outer periphery of the upper opening of the tank body to the inner periphery of the casing,
The tank body is supported by a casing only via a vibration isolating member, and a sound insulating cover covering an upper part of the engine is mounted on the casing.

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

The tank body is housed in a casing, and a sealed air layer is formed between the outer surface of the tank body and the inner surface of the casing around the opening on the upper surface side, and the tank body has only a vibration isolating member. Since the tank body is configured to be supported by the casing through the casing, vibrations propagated from the engine to the tank body via a heat medium etc. are not further transmitted to the casing, and the tank body is a secondary vibrator. Even if noise is emitted, the noise is attenuated by the air layer, blocked by the casing, and is not emitted to the outside.

Furthermore, since the soundproof cover is mounted on the casing and separated from the tank body, vibrations of the tank body are not directly transmitted to the soundproof cover.

[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 attached. 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 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 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 fixed to the upper surface of the support plate, and the compressor 17 is fixed to 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 the partition members 35 and 36 have adjoining chambers 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 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 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, 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 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 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 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 portion 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.

Furthermore, since the soundproof cover 32 is mounted on the casing 1 which hardly vibrates, and is acoustically separated from the tank body 3 which is a secondary vibrator, vibrations may occur due to direct transmission. do not have.

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, the soundproof cover 3
2 and the soundproof case 49 block noise from the engine and also serve as soundproofing for intake and exhaust sounds, so engine noise can be removed extremely effectively and the device can be made compact. Therefore, there is no need to take any other noise prevention measures, and the installation area is also small, making installation extremely easy.

FIG. 3 shows another embodiment, in which a soundproof cover 61 is removably placed on the casing 1 via a vibration isolating member 60, and a soundproof case 62 is removably placed on the soundproof cover 61. It is something that has been done.

That is, the soundproof cover 61 is a cylindrical body with openings on both the upper and lower surfaces, and the casing 1 is located around the lower part.
A large diameter portion 63 having an inner diameter slightly larger than the outer diameter of
The vibration isolating member 60 is provided between the shelf portion 30 of the casing 1 and the stepped portion 64 formed from the upper part to the large diameter portion. is mediated.

Further, a flange portion 65 bent inward is formed around the upper part of the soundproof cover 61, and the soundproof case 62 is placed on the upper surface of this flange portion 65, and a plurality of bolts 66, . . . It is attached removably.

The inside of the soundproof case 62 is divided into two independent rooms 68 and 69 by a partition member 67, and a through hole 70 is provided in the lower surface of one of the rooms 68. While soundproofing and sealing are achieved through a lip seal 71 attached to the circumference, the intake pipe 20 passes through the room 6.
8 and is projected into the interior of the chamber 6.
An intake hole 72 is bored in the upper surface of the air filter 8 .

Further, a through hole 73 is similarly provided on the lower surface of the other chamber 69, through which the exhaust pipe 21 passes through via a lip seal 74, and its open end protrudes into the interior of the chamber 69. An exhaust port 75 formed by a communicating pipe leading to the outside is provided on the upper surface of the exhaust port 75 .

Note that the soundproof cover 61 and the soundproof case 62
The entire inner surface is covered with glass wool or other sound absorbing material 7
6 and 77, respectively.

In this embodiment, when the engine 18 is started, the intake port 7 is opened as shown by arrow A in FIG.
Outside air is taken in through the air intake pipe 20 , and the exhaust air is once discharged into the room 69 through the exhaust pipe 21 and then exhausted to the outside through the exhaust port 75 .

During this time, exhaust heat is stored in the heat medium 19 via the radiator 22.

This embodiment can also exhibit the same soundproofing effect as the first embodiment.

That is, the vibration isolating member 14, the heat medium 19, the tank body 3,
The soundproofing effect of the sound absorbing member 5, the vibration isolating member 9, the air layer 10, and the casing 1 is exactly the same as that of the first embodiment, and the support plate 16
The soundproof cover 6 also protects against noise emitted from the top surface of the
1 and the soundproof case 62, and at the same time, noise emitted from the intake pipe 20 or the exhaust pipe 21 is attenuated and absorbed by the rooms 68 and 69, respectively.

In the case of this embodiment, only the soundproof case 62 needs to be removed during maintenance and inspection, and the soundproof cover 61 only needs to be removed.
There is no need to remove it, so maintenance and inspection are extremely easy. Incidentally, in all of the above embodiments, a heat insulating and sound absorbing member is attached to the inner surface of the casing 1, but this is not necessarily required.

Further, the casing 1 is not necessarily in the shape of a cylinder with a bottom, and even if it is open on both the upper and lower surfaces, the effects of the present invention can be exerted.

[Effects of the Invention] As detailed above, according to the present invention, the engine is supported by the tank body via the vibration isolating material, and the tank body is housed in the casing via the air layer. Therefore, engine vibrations are not directly transmitted to the tank body, and vibrations propagated to the tank body via the heat medium are blocked from being transmitted to the casing because the tank body is supported on the casing via a vibration isolating member. At the same time, noise caused by secondary vibrations of the tank body is also absorbed by the air layer, etc., and is blocked by the casing so that it does not reach the outside.

In addition, a soundproof cover is placed on the casing that also muffles noise from the intake and exhaust air, and since this casing itself hardly vibrates, the soundproof cover itself does not directly receive vibrations from other vibrating bodies. No vibrations are transmitted, and noise reaching the top from the engine is very effectively removed.

[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
The figure is a sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Casing, 3... Tank body, 5... Sound absorbing member which is a vibration isolating member between the casing and the tank body, 10... Air layer, 12, 14... Insulation between the engine and the tank body Vibration member, 18...Engine, 1
9... Heat medium, 32, 61... Soundproof cover.

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. A sound damping system for an engine drive system, characterized in that the tank body is sealed around the circumference, the tank body is supported on a casing only via a vibration isolating member, and a soundproof cover covering an upper part of the engine is mounted on the casing. Device.