JPS60140044A - Water heating device utilizing gas engine - Google Patents

Abstract

PURPOSE:To suppress the change of the air-fuel ratio due to the change of the temperature in an engine room by a method wherein the surface areas of the respective regulators mentioned later is reduced by integrally fitting a main pressure control regulator of fuel gas of a liquid-cooled gas engine and an engine feed pressure control regulator. CONSTITUTION:A pressure regulator 18 consists in integrally fitting a main pressure control regulator 58 to control the pressure of fuel gas fed from outside and an engine feed pressure control regulator 60 to control the pressure of fuel gas sucked under the suction negative pressure of an engine on both sides of a base 56. The main pressure control regulator 58 consists in partitioning a space between the base 56 and a cover plate 62 into a primary gas chamber 64 and an air chamber 66 by means of a diaphragm 68, while the feed pressure control regulator 60 consists into a secondary gas chamber and an air chamber 80 by means of a diaphragm 82. Because of being integrally fitted, the surface areas of both the regulators is small and consequently the influence of the transfer of heat in an engine room to the regulators is made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water heating device that heats water with the coolant of a liquid-cooled gas engine that uses gas fuel such as city gas, LPG, or LNG. It is something.

(Prior Art) A hot water device has been considered in which water is heated by circulating the coolant of a liquid-cooled gas engine in a hot water tank. In this type of device, the engine and the wet water tank are housed in a soundproof and heat insulating case and are sometimes installed outdoors. Further, in this type of device, when the output of the engine is used as motive power for other equipment 9, such as a compressor of a heat pump, it is required that fuel consumption be small. Therefore, the engine is generally operated with an extremely lean mixture.

On the other hand, since such a gas engine is operated intermittently, the humidity in the engine room changes significantly depending on whether the engine is started or stopped. Since the air taken into the engine has a large flow rate and a high flow velocity, its specific volume is unlikely to change significantly due to temperature changes in the engine room.

However, the specific volume of fuel gas with a small flow rate tends to change due to the influence of temperature changes within the engine room. This causes a problem in that the air-fuel ratio changes and engine operation becomes unstable.

In order to avoid these problems, it is desirable to install the intake system outside the case, but due to demands such as simplifying piping and downsizing the device, there are cases where the intake system has no choice but to be housed inside the case. .

(Objective of the Invention) The present invention was made in view of the above circumstances, and aims to downsize the device and simplify the piping by housing the intake system equipment in a case, and at the same time, to reduce the size of the device and simplify the piping. An object of the present invention is to provide a water heating device using a gas engine that suppresses fluctuations in air-fuel ratio due to temperature changes as much as possible and enables stable operation.

(Structure of the Invention) The present invention reduces the influence of engine temperature changes on the fuel gas supply system of the intake system by reducing the surface area of the gas supply system in the engine room. That is, in an engine equipped with a liquid-cooled gas engine and a hot water storage tank that stores hot water heated by the coolant of the gas engine, the pressure that is installed in the engine room and adjusts the dregs pressure that is supplied to the gas engine. A regulator is provided, and the pressure regulator has a source pressure regulating regulator that regulates the pressure of gas supplied from the outside, and an engine supply pressure regulating regulator that regulates the pressure of gas sucked by the engine intake negative pressure, on both sides of the board. It is constructed so that it can be assembled into one piece.

(Example) 7 The present invention will be described in detail below based on the drawings.

FIG. 1 is an overall configuration diagram of an embodiment combining a hot water device and a heat pump, and FIG. 2 is a sectional view of the outdoor unit. In these figures, numeral 10 is a liquid-cooled gas engine, and 12 is a compressor driven by this engine 10. Outside air is air cleaner 14. Gas as a fuel, such as city gas, is sucked into the engine 10 through the mixer 16 and the mixer 16 through the pressure regulator 18.
The mixer 16 generates a mixture of gas and air.

20 is a four-way switching valve, 22 is an expansion valve, 24 is an indoor heat exchanger, and 26 is an outdoor heat exchanger. A working fluid such as Freon is sealed in a closed loop formed by these and the compressor 12, and these and the engine 10 form a known heat pump.

This heat pump operates as follows. During cooling, the switching valve 20 is in the solid line position in FIG.

The working fluid, which has been compressed to a high temperature by the compressor 12, is cooled and liquefied by the outdoor heat exchanger 26, and then passes through the expander 22 to a low pressure and is vaporized by the indoor heat exchanger 24, removing indoor heat. Then, the cycle returns to the compressor 12 again, and the cycle is repeated.

Also during heating.

The switching valve 20 is located at the phantom line position in Figure 1, and the high-temperature working fluid compressed by the compressor warms the room in the indoor heat exchanger 24, passes through the expansion valve 22, becomes low pressure, and then is transferred to the outdoor heat exchanger. Vessel 2
6, it vaporizes and expands, taking in heat from the outside air as latent heat of vaporization.

In FIG. 1, 28 is a hot water storage tank, and the coolant of the engine 10 is circulated through a heat exchanger 30 disposed therein.

Note that 32 and 34 are valves that allow water to flow into and discharge from the hot water tank 28.

The outdoor unit has a square cylindrical case 3 as shown in Figure 2.
It is stored in 8. An engine room 40 is formed in the lower part of this case 38, a hot water tank housing chamber 42 is formed in the upper part thereof, and the outdoor heat exchanger 26 is further housed in the upper part. This case 38 houses each device except for the indoor heat exchanger 24 shown in FIG. A fan 44 is disposed in the outdoor heat exchanger 26 to forcibly guide outside air to the heat exchanger 26. The hot water tank housing chamber 42 houses the hot water tank 28 and an exhaust muffler 46 for the engine 10 . A heat insulating material is attached to the inner wall of this storage chamber 42.

Efforts are being made to improve heat retention.

A heat insulating material having a soundproofing effect is adhered to the inner wall of the engine room 40. Inside this engine room 40 is an engine 10. Compressor 12. Air cleaner 14. mixer 16
．． A pressure regulator 18° and other auxiliary equipment are accommodated. In addition, electromagnetic valves 48 and 50 that cut off the gas supply are connected to the upstream and downstream sides of the pressure regulator 18, so that the gas is cut off when the device is not in use or in an emergency. Further, in this figure, 52a, 52b are inflow/outflow ports for the coolant of the engine 10, 54a, 54. b is the inflow/outflow port of this cooling liquid to the heat exchanger 30.

FIG. 3 is a sectional view of the pressure regulator]8.

On both sides of the substrate 56, there are a source pressure regulating regulator 58 for regulating the pressure of gas supplied from the outside, and an engine supply pressure regulating regulator 60 for regulating the gas pressure sucked by the intake negative pressure of the engine 10.

It is assembled in one piece. Source pressure adjustment regulator 58
includes a diaphragm 68 defining a primary gas chamber 64 and an atmospheric pressure chamber 66 between the substrate 56 and the lid plate 62, and a bottle 70.
The lever 74 is swingably supported by the lever 74 and has one end that engages the diaphragm 68 and the other end that opens and closes the gas supply lower 2 . The engine supply pressure regulating regulator 58 includes a diaphragm 82 that defines a secondary gas chamber 78 and an atmospheric pressure chamber 80 between the base plate 56 and the cover plate 76, and a lever 86 that is swingably supported on a pin 84. One end of the lever 86 engages with the diaphragm 82, and the other end opens and closes the communication hole 88 of the -9 secondary gas chamber 64, 78. A gas outlet 90 that communicates with the gas chamber 16 is opened in the secondary gas chamber 78 .

The source pressure adjustment regulator 58 is made up of a spring 92 and a diaphragm 6.
8, the internal pressure of the gas chamber 64 is reduced to 100n111.
1A, and the engine supply pressure regulating regulator 60 maintains the gas chamber 78 at a pressure slightly lower than atmospheric pressure due to the elasticity of the springs 94, 96 and the diaphragm 82.

In this way, since the regulator 18 has the source pressure regulating regulator 58 and the engine supply pressure regulating regulator 60 integrally assembled on both sides of the substrate 56, the area of the outer surface of the regulator 18 is reduced. Therefore, even if there is a large temperature change in the engine room 40, the gas temperature in the regulator 18 will hardly change. Therefore, fluctuations in the specific volume of the gas are also reduced. On the other hand, since the amount of intake air passing through the air cleaner 14 is larger than the gas flow rate, the intake air temperature does not easily fluctuate even if there is a temperature change in the engine room 40. Therefore, changes in the concentration of the air-fuel mixture are also reduced, and even if the air-fuel mixture is set to a lean concentration, the engine can always operate stably.

Further, since both regulators 58 and 60 are integrated, it is suitable for miniaturization, and since the intake system is also housed in the engine room, external piping is simple and installation is easy.

(Effects of the Invention) As described below, according to the present invention, the regulators for regulating the single pressure and for regulating the engine supply pressure are integrally assembled on both sides of the substrate of the gas pressure regulator, and housed in the engine room. This reduces the surface area of the gas pressure regulator.
The influence of humidity changes in the engine room is reduced. In other words, fluctuations in the mixture concentration are reduced, and the engine can operate stably even with a lean mixture. Furthermore, since the regulator is housed within the device, external piping can be simplified. Furthermore, by downsizing the regulator, the device can also be downsized at the same time.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a sectional view of its outdoor unit, and FIG. 3 is a sectional view of a gas pressure regulator. 10...Engine, 14...Air cleaner. 16...Mixer, 18...Pressure regulator. 28...Hot water tank, 38...Case. 40...Engine room. 58...Regulator for adjusting source pressure. 60...Regulator for adjusting engine supply pressure. Patent Applicant Small Gas Cooling Technology Research Association Agent Patent Attorney Yama 1) Yu Fumi Figure 2 Figure 3

Claims (1)

[Claims] In an engine equipped with a liquid-cooled gas engine and a hot water tank that stores hot water heated by the coolant of the gas engine, a pressure regulator is provided in the engine room to adjust the gas pressure supplied to the gas engine. The pressure regulator includes a source pressure adjustment regulator that regulates the pressure of gas supplied from the outside, and an engine supply pressure adjustment regulator that regulates the pressure of gas sucked by the intake negative pressure of the engine, which are integrated on both sides of the board. A water heating device using a gas engine, characterized in that it is assembled.