JPH0658093B2 - Fuel gas pressure regulator mounting structure for heat pump device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a mounting structure for a fuel gas pressure regulator in a heat pump device.

[Prior art]

As a drive source of a compressor for a heat pump used in an air conditioner or the like, there is one in which an engine operated by using city gas, propane gas, natural gas or the like as a fuel is used. In general, this type of engine is used by being housed in a box surrounded by the compressor and the like in order to prevent noise.

On the other hand, since the fuel gas is stored under pressure at the storage source (supply source), it cannot be supplied to the gas engine at this high pressure, and the pressure is reduced by the pressure regulator (zero governor) inside the engine storage box. After that, it will be supplied to the gas engine. This pressure regulator normally has a diaphragm inside, and the pressure of the fuel gas is reduced by comparing the atmospheric pressure applied to the outside of the diaphragm with the pressure of the fuel gas.

However, since the ambient temperature in the engine storage box differs between when the engine is started and during steady operation after a certain period of time, if the pressure regulator is stored in the engine storage box as described above, There is a problem that the pressure applied to the pressure device changes with time and the setting of the fuel gas to be supplied to the gas engine changes. That is, there is a problem that the concentration of the fuel gas set at the start of the engine becomes thin during the steady operation after a certain period of time.

Further, since the components such as the diaphragm provided inside the pressure regulator are generally made of rubber, there is a problem in that the deterioration is accelerated by the high temperature atmosphere in the engine storage box and the life is shortened.

[Object of the Invention]

An object of the present invention is to provide a mounting structure for a fuel gas pressure regulator in a heat pump device, which can reduce fluctuations in setting of the pressure regulator and extend the life of internal parts.

[Structure of Invention]

According to the present invention for achieving the above object, a compressor is driven by an engine driven by fuel gas, and a pressure regulator for regulating the pressure of fuel gas supplied to the engine by utilizing atmospheric pressure is installed in a heating atmosphere box. In the heat pump device described above, the atmospheric pressure chamber formed in the pressure regulator is connected to the outside of the heating atmosphere box via a passage.

〔Example〕

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

In FIG. 1, 1 is a gas engine, 2 is a compressor driven by the gas engine 1, and these are housed in an engine housing box 3. A cock 4 for taking in fuel gas such as city gas from an external supply source is attached to a lower portion of the engine storage box 3. The cock 4 is connected to the solenoid valve 6 via the supply pipe 5 in the engine storage box 3,
Further, it is connected to the pressure regulator 7. The pressure regulator 7 has a structure in which a diaphragm as will be described later is installed so as to reduce the pressure of the fuel gas and supply the fuel gas to the mixer 9 through the supply pipe 8, where it is mixed with air to mix the gas. Engine 1
I am trying to supply it to. Reference numeral 10 is a muffler, and 11 is a silencer, which exhausts the exhaust gas after combustion in the gas engine 1 and then exhausts it to the outside of the engine storage box 1.

FIG. 2 shows the details of the pressure regulator 7 described above. Reference numeral 20 denotes a tubular case body, a partition wall 21 is formed in the center thereof, and openings on both sides are covered with case lids 22 and 23. . A diaphragm 24 divides the space between the case lid 22 and the partition wall 21 into a primary pressure adjusting chamber 25 and an atmospheric pressure chamber 26, and a diaphragm 27 separates the space between the other case lid 23 and the partition wall 21. It is divided into a pressure adjusting chamber 28 and an atmospheric pressure chamber 29. A gas inlet 30 communicates with the solenoid valve 6 described above, and communicates with the primary pressure adjusting chamber 25 via the valve hole 31. Primary pressure regulation chamber 25 and secondary pressure regulation chamber 28
And the secondary pressure regulating chamber 28 are connected to the above-mentioned supply pipe 8 via a gas outlet (not shown).

The atmospheric pressure chambers 26 and 29 formed on both sides are partitioned into two spaces by partition plates 41 and 42, respectively,
The partition plates 41 and 42 are provided with communication holes 41a and 42a, respectively, and the two spaces communicate with each other. Connecting pipes 43 and 44 are attached to the atmospheric pressure chambers 26 and 29, and ends of flexible hoses 45 and 46 connected to the connecting pipes 43 and 44 are attached to the wall surface of the engine storage box 3, respectively. It is connected to the joint pipes 47 and 48. The joint pipes 47 and 48 penetrate the wall surface of the engine storage box 3 and open to the outside air as shown in FIG. Therefore, the atmospheric pressure chambers 26, 29 are
Does not open inside the engine storage box 3, but is in a state of directly communicating with the outside thereof.

Further, the valve hole 31 is provided with a valve body 33 that opens and closes from the primary pressure adjusting chamber 25 side. The valve body 33 is attached to one end of a swing arm 34 that swings about a shaft 35, and the other end of the swing arm 34 is attached to the diaphragm 2.
It is locked at the center of 4. A spring 36 presses the portion where the swing arm 34 is locked from the outside, and urges the valve element 33 in a direction to open the valve. When the valve body 33 is open, the pressurized fuel gas is supplied to the primary pressure regulating chamber 25, but when the internal pressure reaches a pressure set by the spring 36 and the atmospheric pressure, the valve is closed. The body 33 is closed and the primary pressure adjusting chamber 25 is maintained at a constant pressure.

On the other hand, the valve hole 32 is provided with a valve element 37 that opens and closes from the secondary pressure adjusting chamber 28 side. The valve element 37 is attached to one end of a swing arm 39 that swings about a shaft 38, and the other end of the swing arm 39 is locked to the center of the diaphragm 27. Further, a spring 40 is stretched at a portion where the swing arm 39 is locked. This spring 40 keeps the valve element 37 in a state of being balanced with the atmospheric pressure.
Is urged in a direction to close the valve so that the internal pressure of the secondary pressure regulating chamber 28 is further reduced. When intake negative pressure acts on the secondary pressure regulating chamber 28 from the gas engine 1 side, the valve element 37 opens, and new fuel gas flows from the primary pressure regulating chamber 25.

Now, in the above-mentioned device, the atmospheric pressure chambers 26, 2 of the pressure regulator 7 are
7 is in communication with the outside of the engine storage box 3 through the tubular passages of the hoses 45 and 46. Therefore, the atmospheric temperature inside the atmospheric pressure chambers 26 and 27 is maintained at a relatively low temperature close to the outside air temperature even if the atmospheric temperature inside the engine storage box 3 rises due to the operation of the gas engine 1. Therefore, there is no pressure change in the atmosphere in the atmospheric pressure chambers 26 and 27 between the time of engine start and the steady operation after a lapse of a certain time, and thereby the setting fluctuation of the pressure regulator 7 can be reduced.

Further, since the temperature inside the atmospheric pressure chambers 26 and 27 is maintained at a low temperature, it is possible to prevent the diaphragms 24 and 27 made of rubber from being deteriorated at an early stage and extend the life thereof.

〔The invention's effect〕

As described above, according to the present invention, the compressor is driven by the engine operated by the fuel gas, and the pressure regulator that regulates the pressure of the fuel gas supplied to the engine by using the atmospheric pressure is installed in the heating atmosphere box. In the heat pump device described above, the atmospheric pressure chamber formed in the pressure regulator is made to communicate with the outside of the heating atmosphere box through the passage. The ambient temperature in the room can be prevented from changing significantly. Therefore, there is no significant change in the atmospheric pressure in the atmospheric pressure chamber,
As a result, fluctuations in the setting of the pressure regulator can be reduced.

In addition, since the temperature inside the atmospheric pressure chamber is maintained at a low temperature, it is possible to prevent the rubber parts and the like in the pressure regulator from prematurely deteriorating and to extend the life.

[Brief description of drawings]

1 is a schematic view showing a gas engine having a pressure regulator according to an embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III in FIG. Is. 1 ... Gas engine, 3 ... Engine storage box (heating atmosphere box), 5, 8 ... (fuel gas) supply pipe, 7 ... Pressure regulator, 9 ... Mixer, 26, 29 ... Atmospheric pressure chamber , 43, 4
4, 47, 48 ... Joint pipe (tubular passage), 45, 46 ...
Hose (tubular passage).

Claims (1)

[Claims] 1. A heat pump device in which a compressor is driven by an engine driven by fuel gas, and a pressure regulator for regulating the pressure of the fuel gas supplied to the engine using atmospheric pressure is installed in a heating atmosphere box. The atmospheric pressure chamber formed in the pressure regulator is communicated to the outside of the heating atmosphere box via a passage in the fuel gas pressure regulator mounting structure of the heat pump device.