JPS6277568A - Ventilating device for engine driving heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a ventilation system for an engine-driven heat pump.

[Prior art]

In an engine-driven heat pump, the engine, compressor, etc. are sources of noise, so it is desirable to house these devices in a housing to prevent noise. However, if the engine, etc. is housed in a sealed state in the housing, the internal atmosphere becomes too high due to the heat generated by the engine, etc., so to prevent this, ventilation devices such as ventilation fans are installed. It is better to make it .

However, when such a ventilation fan is provided, there is a problem in that the opening is enlarged by the ventilation fan, which increases the leakage of internal noise and reduces the soundproofing effect of the sealed housing.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilation system for an engine-driven heat pump that is equipped with a ventilation fan, reduces noise leakage from inside the housing, and improves the noise prevention effect of the housing.

[Structure of the invention]

To achieve the above object, the present invention houses an engine and a compressor driven by the engine in a housing, and the housing is provided with an intake port for ventilation and an exhaust port with a ventilation fan, and the exhaust port is provided with an intake port for ventilation and an exhaust port with a ventilation fan. It is characterized by having a duct lined with sound-absorbing material.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows the power part of an engine-driven heat pump, where 1 is an engine driven by gas fuel such as city gas or propane gas, and 2 is a compressor fixed on the engine 1. The compressor 2 is driven via a belt 5 wound between a pulley 3 on the engine 1 side and a pulley 4 on the compressor 2 side. The compressor 2 compresses the refrigerant and circulates it through a circulation pipe to an air heat exchanger 28, etc., which will be described later. The engine l with the compressor 2 fixed in this way is mounted on the left and right support columns 7.7 erected on the base ItIi6.
It is supported via elastic members 8, 8 made of rubber or the like, and is housed in this state in a housing 9 having a soundproof structure.

An intake silencer lO is provided in the upper corner of the housing 9. This intake silencer 10 not only prevents noise caused by intake pulsation, but also serves as an air purifier. 11.
Reference numeral 12 denotes a muffler provided in two stages for muffling the exhaust gas of the engine 1, respectively. Among these, the former muffler 11 has a structure that also serves as a heat exchanger that exchanges heat with engine cooling water. Further, the engine 1 is provided with an ignition coil 13, a solenoid valve 14 for supplying gas fuel, and the like.

The substrate 6 at the bottom of the housing 9 forms a space surrounded by a bottom plate 16 on the lower side, and the space is filled with a sound absorbing material 17 such as polyurethane foam. The sound-absorbing material 17 has intake passages 18.18 branched into two paths formed therein, each of which communicates with the inside of the 7% housing 9 via intake ports 19.19 provided in the substrate 6. These plurality of intake ports 19
．． One of the ignition coils 19 is open close to the ignition coil 13, and the other is open close to the electromagnetic valve 14. Another sound-absorbing material 20 such as polyurethane foam is attached to the lower surface of the bottom plate 16, and an intake passage 21 communicating with the outside air is provided in this sound-absorbing material 20. It's communicating. Further, a sound insulating skirt 22 is provided around the outer periphery of the sound absorbing material 20.

On the other hand, an exhaust port 23 is provided on the upper surface of the housing 9.
A ventilation fan 24 is attached to the exhaust port 23 to suck out the air inside the housing. Further, a long duct 27 is attached to the exhaust port 23, and a sound absorbing material 26 made of foamed polyurethane or the like is attached to the inner surface of the duct 27.

In this case, the ventilation fan 24 provided at the exhaust port 23 is
As shown in FIG. 2, it may be provided on the upstream side of the duct 25. Further, the duct 25 is not necessarily the housing 9.
It does not need to be installed on the inside of the housing, but may be installed on the outside as shown in FIG. Further, the duct 25 does not need to be straight cylindrical as in the above embodiments, but may be curved as shown in FIG. 4.

As mentioned above, another unit 30 is installed in the upper part of the housing 9 in which the power section is housed, and an air heat exchanger 29 with an attached fan 28, 28 is provided. This unit 30 does not necessarily need to be placed on the top of the housing 9 as in this embodiment, but may be removed from the top and placed elsewhere depending on the space available at the installation location.

In the ventilation system described above, when the ventilation fan 24 rotates, low-temperature outside air flows through the intake passage 21 at the bottom as shown by the arrow.
and further passes through the intake passage 18.18 to the intake port 1.
9. It is sucked into the housing 9 from 19 and is worn out. At this time,
゛The low-temperature air first passes through the ignition coil 13. After passing through the electromagnetic valve 14 and the like, the air passes through the engine 1 and the like above, heads to the exhaust port 23, and is sent from there to the unit 30 above.

In the engine-driven heat pump described above, since the engine 1 and the compressor m2, which are sources of noise generation, are housed in the housing 9, the noise generated from them is prevented from leaking outside. Furthermore, since the exhaust silencers 11 and 12 that generate shell noise due to exhaust pulsation are also housed in the housing 9, leakage of the shell noise can also be prevented.

Furthermore, the housing 9 is provided with a 4° ventilation system using a ventilation fan 24 to prevent the internal atmosphere from becoming extremely hot. Since the duct 25 and the sound absorbing material 26 are attached to the exhaust port 23, internal noise that would otherwise leak out from the exhaust port 23 can be muffled by the duct 25 and the sound absorbing material 26. Therefore, in this engine-driven heat pump, even though the housing 9 is provided with the ventilation fan 24, the noise can be reduced.

〔Effect of the invention〕

As described above, in the present invention, an engine and a compressor driven by the engine are housed in a housing, and the housing is provided with an intake port for ventilation and an exhaust port with a ventilation fan, and the exhaust port is provided with a sound absorbing port. Since the duct lined with material is provided, this duct can reduce noise leakage from inside the housing while providing a ventilation fan, thereby improving the noise prevention effect of the housing.

[Brief explanation of drawings]

FIG. 1 is a front view showing an engine-driven heat pump equipped with a ventilation system according to the present invention with a part of the housing removed;
FIG. 4 is a sectional view showing another embodiment of the duct portion in the same ventilation device.

Claims (1)

[Claims] The engine and the compressor driven by the engine are housed in a housing, the housing is provided with an intake port for ventilation and an exhaust port with a ventilation fan, and the exhaust port is provided with a duct lined with sound-absorbing material. A ventilation system for an engine-driven heat pump characterized by: