JPS6278424A - Ventilation device for engine driven heat pump - Google Patents

Abstract

PURPOSE:To prevent noises and elongate the service life of electrical fittings by installing an engine and a compressor to be driven thereby within a housing, providing suction and exhaust ports on said housing and arranging electrical fittings near said suction port. CONSTITUTION:An engine 1 driven on a gas fuel has a compressor 2 mounted on top and driven by own power via transmission means 3-5. And the engine 1 is supported on the pillar 7 of a foundation 6 via an elastic member 8 and stored as it is in a sound-proof housing 9. On the other hand, a plurality of suction ports 19 are made open to the foundation 6 of the housing 9 in the vicinity of an ignition coil 13, water pump and a solenoid valve 14. Also, the upper side of the housing 9 is provided with an exhaust port 23 and this port 23 is fitted with a vent fan 24. Consequently, noise prevention effect can be maintained by the housing 9, and it is possible to eliminate an adverse effect upon electrical fittings 13 and 14 due to ambient temperature in the housing 9.

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, when an engine etc. is housed in a sealed state in a housing like this, the internal atmosphere becomes high temperature due to the heat generated by the engine etc., which causes the ignition coil attached to the engine drive heat pump and the fuel supply solenoid valve to become hot. This adversely affects electrical components such as water pump motors, shortening their lifespans.

In order to prevent the internal atmospheric temperature from rising too much, it is recommended that the housing be provided with a ventilation device such as a ventilation fan. However, by simply providing a ventilation fan, it is impossible to raise the temperature to a level sufficient to eliminate the adverse effects on electrical components. On the other hand, too much cooling may actually cause engine malfunction, or if a heat exchanger using engine cooling water or the like is provided in the housing, it may cause a reduction in its efficiency.

[Purpose of the invention]

An object of the present invention is to provide a ventilation system for an engine-driven heat pump that can prevent the adverse effects of internal ambient temperature on electrical components while maintaining the noise prevention effect of the housing, thereby extending the life of the electrical components.

[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 housing is provided with an intake port for ventilation and an exhaust port with a ventilation fan. It is characterized by the fact that electrical components attached to the engine-driven heat pump are located nearby.

〔Example〕

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

Figure 1.2 shows the power section of an engine-driven heat pump, 1
2 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 1 with the compressor 2 fixed in this way is supported on left and right pillars 7, 7 erected on the base plate 6 via elastic members 8, 8 made of rubber, etc., and is soundproofed in this state. It is housed in a housing 9 of the structure.

An intake silencer 10 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. The engine 1 also includes an ignition coil 13 and a solenoid valve 14 for supplying gas fuel. A sewage pump 15 driven by a motor for circulating engine cooling water is attached.

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 forms an intake passage 18.18 which is branched into two paths.
Each of them communicates with the inside of the housing 9 via an intake port 19, 19 provided in the base plate 6. These multiple intake ports 1
9. One of the 19 is the ignition coil 13° water pump 1
5, and the other opens close to the electromagnetic valve 14 (see FIG. 3). Further, another sound absorbing material 20 such as foamed polyurethane is attached to the lower surface of the bottom plate 16,
This sound absorbing material 20 is provided with an intake passage 21 communicating with the outside air, which communicates with the intake passage 18° 18 on the sound absorbing material 17 side. Furthermore, 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 so as to suck out air from inside the housing. Further, a long duct 27 is attached to the exhaust port 23, and a sound absorbing material 26 is attached to the inner surface of the duct 27.

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 engine-driven heat pump described above, the engine 1 and compressor 2, which are sources of noise generation, are housed in the housing 9, so that 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.

In addition, as the ventilation fan 24 rotates, low-temperature outside air is sucked into the intake passage 21 at the bottom as shown by the arrow.
Further, the air is sucked into the housing 9 through the intake passage 18.18 and from the intake opening 19.19. At this time, the low temperature air flows into the ignition coil 13. Solenoid valve 14. After passing through the water pump 15 and the like, the water heads to the exhaust port 23 via the engine 1 and the like above, and from there is sent to the unit 30 above. Therefore, in this ventilator, the ignition coil 13. in the housing 9. Electrical components such as the solenoid valve 14 and the drive motor of the water pump 15 are always exposed to the low temperature air introduced into the housing 9 first, so they are not affected by the high temperature atmosphere inside. The lifespan can be extended by

〔Effect of the invention〕

As described above, the present invention includes an engine and a compressor driven by the engine housed in a housing, an intake port for ventilation and an exhaust port with a ventilation fan provided in the housing, and a ventilator in the vicinity of the intake port. Since the electrical components attached to the engine-driven heat pump were placed in the housing, in order to maintain the noise prevention effect of the housing, the electrical components were always exposed to the low-temperature air that was initially distributed inside the housing.
It is possible to eliminate the adverse effects of high-temperature internal atmosphere on electrical components and extend their lifespan.

[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. 2 is a side view of the same, and FIG. 3 is a plan view showing the substrate of the housing. . ■-Engine, 2-Compressor, 9 Housing,
13-Ignition coil, 14-Solenoid valve, 15-...
water pump, 18.21-intake passage, 19--intake port, 23--exhaust port, 24-ventilation fan.

Claims (2)

[Claims] (1) An engine and a compressor driven by the engine are housed in a housing, an intake port for ventilation and an exhaust port with a ventilation fan are provided in the housing, and an engine-driven heat pump is provided near the intake port. A ventilation system for an engine-driven heat pump, characterized in that electrical components attached to the engine are arranged. (2) A ventilation system for an engine-driven heat pump according to claim 1, wherein a plurality of intake ports are provided corresponding to electrical components distributed at a plurality of locations.