JPS60187745A - Submerged internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce vibration and noises of an engine, by covering an inner casing having therein a submerged engine and a heat medium liquid for the engine by an outer casing by the intermediary of an air layer or a noise-absorbing material, and forming a noise-absorbing chamber above the inner casing. CONSTITUTION:An engine 3 is installed in water W filled in an inner casing 2 to serve as a heat medium. Vibration-damping members 62 are interposed between the cylindrical wall 56 and the bottom wall 59 of the inner casing 2 and the cylindrical wall 55 and the bottom wall 58 of an outer casing 1 to define hollow spaces 57, 60. A crankshaft 5 is projected upward from a crankcase 6 and connected to a work machine 31 such as a compressor of an air conditioner via a flywheel 21 and a coupling 30. The upper end of the inner casing 2 is closed by a cap 48, and a cover 47 having a noise-absorbing material attached thereto is disposed above the cap 48, in the manner that a noise-absorbing chamber 50 incorporating therein the work machine 31, an oil strainer 35, an intake-air cleaner 36, etc. is defined between the cap 48 and the cover 47. Further, a pipe P extending along the inner surface of the inner casing 2 is connected to an external hot-water supply system or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a submerged internal combustion engine used in a heat pump system for heating and cooling.

(Prior art) Generally, in this type of heat pump system, the engine for driving the compressor is immersed in water or other heat medium liquid in a liquid chamber, and the heat of the engine is used to heat the heat medium. ing. However, since water easily transmits sound, conventional systems have the problem that engine noise is easily transmitted to the liquid tank through the water, resulting in a large amount of noise being emitted from the liquid tank to the outside. Furthermore, the conventional structure also has the problem that engine intake noise is easily transmitted to the outside, and that engine vibration is not easily transmitted to the outside.

(Object of the Invention) In order to solve the above-mentioned conventional problems, it is an object of the present invention to provide a submerged internal combustion engine by improving the soundproofing structure and vibrationproofing structure.

(Structure of the Invention) The present invention is characterized in that an engine is disposed in an inner chamber in which a heat medium liquid is stored, and the inner tube is covered with an outer tube through an air layer or a sound absorbing material, and the inner tube and the outer tube are connected to an air layer or a sound absorbing material. It is characterized by forming a sound insulating layer with material, covering the upper end opening of the inner cylinder with a lid, covering the lid with a cover from above to form a sound absorption chamber between the two, and disposing an engine intake cleaner in the sound absorption chamber. There is.

(Example) In FIG. 1, which is a partially cutaway schematic front view, an inner cylinder 2 (liquid tank) having a similar shape is placed inside an outer cylinder 1 which is a container that opens upward.
is accommodated. Water W for heat medium or other liquid is stored in the inner cylinder 2, and the engine 3 is installed in the water W. In order to use the water W heated by the engine 3 as a heat source, a pipe P is installed inside the inner cylinder 2 along its inner peripheral surface.
is arranged in a spiral shape. The pipe P is connected to a water heater, a space heater, etc. on the outside.

The engine 3 is installed with the crankshaft 5 vertical, and the cylinder block 7 and cylinder head 8 are aligned horizontally with respect to the crankcase 6.

An exhaust heat exchanger 10 is provided below the cylinder head 8 , and an exhaust pipe 11 extending downward from the lower surface of the cylinder head 8 is connected to the exhaust heat exchanger 10 . An exhaust silencer 12 is provided below the crankcase 6, and the exhaust heat exchanger 10 and the exhaust silencer 12 are connected via a communication pipe 13.

A gear case 15 is provided below the crankcase 6, and the exhaust heat exchanger 10 is fixed to the gear case 15 via a bracket 16. An oil tank 17 is provided on the lower side of the gear case 15, and an exhaust silencer 12 is attached to a stay 18 fixed to the oil tank 17.

An exhaust pipe 20 is connected to the bottom of the exhaust silencer 12. The discharge pipe 20 extends to the outside of the outer cylinder 1 and is configured to discharge condensed water within the exhaust silencer 12.

The crankshaft 5 projects upward from the crankcase 6, and a flywheel 21 is fixed to the projecting end thereof. The flywheel 21 is located below the water surface 1a of the water W. The flywheel 21 is surrounded by a flywheel housing 23 from below and around the periphery. The housing 23 is bolted to the crankcase 6 in a watertight manner.

A joint 30 is attached to the upper surface of the flywheel 21, and the lower end of a vertical input shaft 32 of a working machine 31 is connected to the joint 30. Specifically, work 31 is a compressor or generator for an air conditioner or a generator, a pump for hot water circulation, etc.

A mounting flange 33 made of an annular plate is fixed to the upper end of the flywheel housing 23. The working machine 31 is fitted onto the inner periphery of the flange 33 from above and secured with bolts. An oil strainer 35, an intake cleaner 36, etc. are attached to the upper surface of the flange 33 around the working machine 31. The flange 33 is provided with an intake passage hole (not shown) that constitutes an intake outlet of the intake cleaner 36, and a joint 39 is provided on the outer surface of the cylindrical portion of the housing 23. The intake cleaner 36 is connected to the intake passage hole and the joint 39.
It is connected to the upper end of the intake pipe 40 via. Intake pipe 40
The lower end is fixed to the upper end of the cylinder head 8.

The outer periphery of the flange 33 is an annular engine mount 41 (
It is supported from below by the inner peripheral part of the plate (=l plate) via vibration isolating rubber 42. Outer circumference of flange 33 and mount 4
The gap between the inner peripheries of 1 is sealed by a seal 43. The outer peripheral part of the mount 41 is an annular large diameter part 45 at the upper end of the inner cylinder 2.
The mount 1-41 is fixed to the large diameter portion 45 together with the cover 47. As is clear from the above description, the flange 33 and the mount 41 constitute a lid 48 that closes the upper end opening of the inner cylinder 2.

The cover 47 is a bowl-shaped member that opens downward, and the outer periphery of the upper end is connected to the inner cylinder 2.
It fits into the large-diameter cylindrical portion 49 at the upper end, and a chamber 50 is formed between the cover 47 and the lid 48 in which the working machine 31, oil strainer 35, intake cleaner 36, etc. are accommodated. An intake pipe 51 of the intake air cleaner 36 extends inside the chamber 50, and the cover 47 is provided with an intake passage 52 that connects the chamber 50 and the outside space.

Next, the structure of each part will be explained in more detail.

A space 57 is formed over the entire circumference between the cylindrical peripheral wall 55 of the outer cylinder 1 and the cylindrical peripheral wall 56 of the inner cylinder 2, and a space 57 is formed between the bottom wall 58 of the outer cylinder 1 and the bottom wall 59 of the inner cylinder 2. A space 60 is also formed. The space 57 and the space 60 are continuous with each other, and the upper end of the space 57 is closed by the annular large diameter portion 45 of the inner cylinder 2. The outer cylinder 1 is provided with a flange 61 on the inner periphery of the upper end, and the outer cylinder 1 fits into the lower surface of the annular large diameter portion 45 and the outer peripheral surface of the cylindrical portion 49 at the flange 61 and a portion above the flange 61. .

In order to form the above-mentioned spaces 57, 60, a vibration isolating material 62 which also serves as a spacer is interposed between the peripheral walls 55, 56, and also at multiple locations between the bottom walls 58, 59 (not shown). material is interposed.

As shown in FIG. 2, which is a schematic perspective view, the vibration isolators 62 are provided at, for example, two locations spaced apart from each other in the vertical direction of the peripheral wall 56.
Each of them extends in an annular shape over the entire circumference of the peripheral wall 56.

Instead of the structure shown in Fig. 2, a vibration isolating material 62 is installed on the peripheral wall 5 as shown in Fig. 3.
It is also possible to form a shape that extends vertically over the entire height of the peripheral wall 56, and to arrange such vibration isolators 62 at a plurality of locations at intervals in the circumferential direction of the peripheral wall 56. Also, the vibration isolating material 6 in Figures 2 and 3
It is also possible to use a combination of the two. It is also possible to close the bottom walls 58 and 59 of FIG. 1 and eliminate the space 60. Further, when the space 60 is eliminated, the bottom wall 58 may be eliminated and the outer tube 1 may be formed of a cylindrical body consisting of only the peripheral wall 55, and the space 57 may be closed at both upper and lower ends of the peripheral wall 55.

In FIG. 1, the seal 43 is interposed between the lower surface of the outer circumference of the flange 33 and the upper surface of the inner circumference of the mount 41 over the entire circumference. Seal 43 is made of a flexible closed cell foam, such as polyethylene foam, and is adhered to flange 33 or mount 41.

A plate-shaped support 66 is fixed to the upper surface of the outer peripheral portion of the flange 33. The support 66 protrudes from the outer periphery of the flange 33 to the upper inner periphery of the mount 41.
The vibration isolating rubber 42 is interposed between the mount 6 and the mount 41, and is fixed by a vertical bolt 67. IV in Figure 1
As shown in FIG. 4, which is a schematic diagram in the direction of the -IV arrow, the vibration isolating rubber 42 and the bolts 67 are arranged at equal intervals on a corresponding circle centered on the crankshaft 5.

In place of the seal 43 shown in FIG. 1, the structures shown in FIGS. 5 to 7 may be adopted. In the structure shown in FIG. 5, the flange 33 and the mount 41 are provided at the same height, and the gap between them is sealed by a rubber plate 70. Rubber plate 7
0 is an annular inner circumferential part 71 and an annular outer circumferential part 72 fixed to the upper surfaces of the flange 33 and the mount 41, respectively, and the middle part 7 of the mouth-shaped cross section that is continuous with the inner circumferential part 71 and the outer circumferential part 72.
3 is in close contact with the outer circumference of the flange 33 and the inner circumference of the mount 41. In the structure shown in FIG. 6, an annular seal 74 made of discontinuous cell foam is interposed between the flange 33 and the mount 41 in place of the rubber plate 70 shown in FIG. In the structure shown in FIG. 7, a seal 75 made of discontinuous cell foam is interposed between the annular support 66 or the upper bent portion of the flange 33 and the mount 41 on the outer peripheral side of the vibration isolating rubber 42.

In FIG. 1, the intake passage 52 is formed between a circular top wall main body 76 of the cover 47 and an overhanging portion 77 above it. As shown in FIG. 8, which is a schematic view of a portion taken along arrows 1--2 in FIG.

As shown in FIG. 9, which is a schematic cross-sectional view taken along line IX-IX in FIG. 8, the projecting portion 77 is a member having a generally downwardly opening-shaped cross section, and is fixed to the top wall main body 76. As shown in FIG. 1, the lower part 8 is located at a distance from the intake cleaner 36 between the top wall main body 76 communicating with the intake passage 52. Further, a sound absorbing material 79 is attached to almost the entire inner surface of the cover 47 and the overhanging portion 77.

(Function) In the operating state, the work 131 is driven by the engine 3,
Further, the engine 3 heats the liquid in the pipe P via the water W. In this operating state, the noise from engine 3 is water
It is transmitted to the inner cylinder 2 via.

However, since a space 57,60 (a sound insulating layer made of air) is formed outside the inner cylinder 2, the transmission of engine noise to the outer cylinder 1 is greatly suppressed, and the noise emitted from the outer cylinder 1 to the outside is suppressed. The amount is extremely small. Engine noise is also emitted upwards, but the upper end opening of the inner cylinder 2 is closed with a lid 48, and a sound absorbing material 79 is pasted on the upper side of the tray 48 (a cover 47 is installed). The amount of noise transmitted from the engine 3 to the external space above is also small.

The vibrations of the engine 3 are transmitted to the inner cylinder 2 via the water W, but since the inner cylinder 2 is connected to the outer cylinder 1 by the vibration isolating material 62, the amount of vibration transmitted to the outer cylinder 1 is extremely small. . Therefore, noise caused by vibrations is not emitted from the outer cylinder 1 to the outside.

A portion of the water W heated as described above becomes steam and enters the chamber 50.
trying to invade. If steam were to enter the chamber 50, a problem would occur in that the steam would be sucked into the engine 3 along with the air in the chamber 50, and the sound absorbing material 79' would absorb moisture, deteriorating its sound absorbing properties, or causing damage to various parts. The problem of chain formation also arises.

However, in the illustrated structure, since the chamber 50 is sealed from the inside of the inner cylinder 2 by the seal 43, steam will not enter the chamber 50, and there is no possibility that the above problem will occur. Moreover, since the seal 43 is flexible, there is no risk of damage due to vibrations from the engine 3, and it always performs a predetermined sealing action.

The vibration isolating rubber 42 blocks engine vibrations that try to be transmitted to the mount 41. Rolling (horizontal shaking) is generally the biggest problem when installing engine vibration isolation, but in the structure shown, the dead weight of the engine 3 is transferred to the vibration isolation rubber 42.
is receiving the load in the vertical direction, so the anti-vibration rubber 42
acts as a flexible member against lateral loads. In other words, the anti-vibration rubber 42 can bring the natural frequency of the rolling of the engine to as low a frequency as possible,
Resonance caused by engine operation can be prevented. Therefore, the rolling of the engine 3 can be prevented from being transmitted to the inner cylinder 2 and the like.

In addition, as shown in FIG. 4, the vibration isolating rubbers 42 are installed at equal intervals around the crankshaft 5, so that a large load is not applied to some of the vibration isolating rubbers 42, preventing damage or deterioration of the vibration isolating rubbers 42. This makes it possible to always obtain a predetermined vibration-proofing effect. Moreover, by changing the number and position of the anti-vibration rubber 42,
The load on the vibration-proofing rubber 42 and the vibration-proofing characteristics of the vibration-proofing rubber 42 can be easily adjusted.

In FIG. 1, combustion air for the engine 3 is supplied to the engine 3 from the outside through an intake passage 52, a chamber 50, an intake pipe 51, an intake cleaner 36, and an intake pipe 40. In this case, there is a risk that intake noise may be transmitted to the outside, but as shown in FIG. 3, the intake noise is sufficiently attenuated and transmission of the intake noise to the outside is prevented. In other words, the intake passage 52 and the chamber 50 are provided as a second-stage muffler under the intake cleaner 36 (silencer), and a double muffler structure is adopted as a whole, so that the intake noise is sufficiently reduced. The sound is muted.

(Effects of the Invention) As explained above, according to the present invention, the container housing the engine 3 has a double structure consisting of the outer cylinder 1 and the inner cylinder 2, and the outer cylinder 1, the inner cylinder 2, and the space 57 between them are Since the sound insulation layer is formed, the amount of noise transmitted to the outside can be sufficiently reduced. Furthermore, since the chamber 50 is formed above the inner cylinder 2 and the intake cleaner 36 is disposed in the chamber 50, intake noise can also be sufficiently attenuated.

Also, water has a high vibration transmission rate, but in the structure shown, the inner cylinder 2 containing water W is covered with the outer cylinder 1, and the cover 47 etc. are not covered with the outer cylinder 1, so noise is not transmitted. This means that only the easily accessible parts are covered with the outer cylinder 1, and the outer cylinder 1 is made the smallest while solving the noise problem. Therefore, the overall structure can be made smaller and lower in cost.

(Other Embodiments) The intake passage 52 shown in FIG. 1 is abolished, the intake pipe 51 is extended so as not to extend outside the cover 47 as shown in FIG. 11, and a large number of small holes 80 are provided in the intake pipe 51. You can also do it. In this way, the chamber 50 acts as a resonance chamber, so that intake noise can be sufficiently reduced. Note that the intake pipe 51 shown in FIG. 11 can also be bent upward to protrude upward from the hole in the top wall main body 76.

As shown in FIG. 12, a sound absorbing material 81 such as urethane foam may be filled between the outer cylinder 1 and the inner cylinder 2.

The sound absorbing material 79 in FIG. 1 can also be eliminated.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic front view of the embodiment, Figs. 2 and 3 are schematic perspective views of the inner cylinder of different embodiments, and Fig. 4 is the schematic diagram of the inner cylinder of the first embodiment.
IV-IV partial schematic view of the figure, Figures 5 to 5, Figure 6
Figure 7 Figure 8 Figure 10 Figure 0 Figure 12

Claims (1)

[Claims] The engine is placed in an inner cylinder that stores a heat medium liquid, and the inner cylinder is covered with an outer cylinder through an air layer or a sound absorbing material, and a sound insulating layer is formed between the inner cylinder and the outer cylinder with the air layer or sound absorbing material. A submerged internal combustion engine, characterized in that the upper end opening of the inner cylinder is covered with a lid, the lid is covered with a cover from above to form a sound-absorbing chamber between the two, and an engine intake crease is disposed in the sound-absorbing chamber. .