JP4075686B2 - Diesel engine type outdoor unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a diesel engine type outdoor unit that drives a compressor of an air conditioner in a diesel engine.
[0002]
[Prior art]
Conventionally, there is a diesel engine type outdoor unit in which a compressor of an air conditioner is driven by a diesel engine.
[0003]
This diesel engine generates power by injecting fuel stored in a fuel tank with a fuel injection pump and burning it in the combustion chamber of the diesel engine, which is converted into rotational power and transmitted to the compressor. In some cases, air (air) is mixed between the fuel tank and the fuel injection pump, and the fuel mixed with this air may be blown out from the fuel injection pump into the combustion chamber.
[0004]
When fuel mixed with air blows into the combustion chamber, the amount of fuel necessary for combustion is insufficient, combustion cannot be continued in the combustion chamber, and power cannot be generated. This is the stalled state.
[0005]
Conventionally, when the diesel engine is in the stalled state due to the mixed air, the problem has been solved by manually opening the air vent valve connected to the fuel injection pump and directly removing the mixed air from the fuel to the atmosphere.
[0006]
[Problems to be solved by the invention]
However, the point where the air is vented with the air vent valve has been opened directly to the atmosphere, but if the air is directly vented to the atmosphere with the air vent valve, it may leak to the fuel at the same time as the air. The fuel contaminated the installation environment of the diesel engine type outdoor unit.
[0007]
The present invention has been made in view of the above points. That is, an object of the present invention is to provide a diesel engine type outdoor unit that can reduce the degree of pollution to the installation environment by extracting air mixed in the fuel into the oil tank.
[0008]
[Means for Solving the Problems]
The diesel engine type outdoor unit according to claim 1, a diesel engine that transmits a rotational driving force of a compressor of an air conditioner, an oil tank that is installed above the diesel engine and stores engine oil supplied to the diesel engine, A fuel supply path to a fuel injection pump for injecting fuel into the diesel engine, an air vent pipe communicating with the oil tank, and air mixed in the fuel in the fuel supply path through the air vent pipe It is characterized by having an air vent valve that pulls out from the fuel supply path.
[0009]
According to the present invention, both the air that has escaped from the air vent valve and the fuel that leaks together with the air can be discharged into the engine oil tank. It is possible to reduce the degree of contamination.
[0010]
According to a second aspect of the present invention, the diesel engine type outdoor unit includes a control unit that opens the air bleeding valve for a predetermined time when the diesel engine is stopped.
[0011]
According to the present invention, when the diesel engine is stopped and it is not necessary to supply fuel into the combustion chamber, the air vent valve is opened for a predetermined time, and the fuel supply path and the oil tank installed thereabove are opened. By communicating, the air mixed in the fuel in the fuel supply path can be extracted using its buoyancy, so that it is possible to save the trouble of manually extracting the air.
[0012]
The diesel engine type outdoor unit according to claim 3, wherein the control means determines whether or not the diesel engine is in an stalled state, and the judgment result of the engine stall judging means indicates that the engine is in the stalled state. And an air vent valve opening / closing control means for opening the air vent valve for the predetermined time.
[0013]
According to the present invention, even when the diesel engine is in an engine stall state due to air mixed into the fuel, the air vent valve is automatically opened, and the fuel supply path and the oil tank installed thereabove communicate with each other. Since air mixed in the fuel in the fuel supply passage can be extracted using its buoyancy, it is possible to save the trouble of manually extracting air even in an emergency such as an engine stall state.
[0014]
The diesel engine type outdoor unit according to claim 4, wherein the diesel engine has a starter for starting the diesel engine, the control means is configured such that the air vent valve opening / closing control means is configured so that the air vent valve is set to the predetermined value. It has a starter starting means for starting the starter after being opened for a period of time.
[0015]
According to the present invention, the diesel engine that is in the stalled state by the air mixed in the fuel can be automatically restarted, so that it is possible to save time and effort for restarting the diesel engine.
[0016]
The diesel engine type outdoor unit according to claim 5, wherein the control unit determines that the starter starting unit determines whether or not the diesel engine has started, and the determination unit determines not to start. In this case, it has a notifying means for notifying that effect.
[0017]
According to the present invention, even when the diesel engine does not start even by the start control by the starter starting means, the user can know that fact, so that the diesel engine remains in the stalled state. Things are possible.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
A diesel engine type outdoor unit 100 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of the configuration of a diesel engine type outdoor unit 100 of the present invention.
[0019]
In FIG. 1, reference numeral 100 denotes a diesel engine type outdoor unit that compresses a refrigerant that circulates in a refrigeration cycle by rotationally driving a compressor 30 of an air conditioner in an engine body 21.
[0020]
The diesel engine type outdoor unit 100 includes an engine oil supply system unit 10, an engine system unit 20, a compressor 30, a control device 40, and a speaker 41.
[0021]
The oil tank supply system unit 10 is connected to an engine oil tank 11 having an air vent 12 and an engine oil replenishment port 13 and an oil pan 24 installed below an engine body 21 described later via an oil communication pipe 18. A sub oil pan 16 that constantly supplies engine oil, an oil float 17 that floats on the oil level of the engine oil in the sub oil pan 16 and detects that the oil level reaches a predetermined position, and an engine oil tank 11. The engine oil supply pipe 14 for supplying engine oil to the sub oil pan 16, and the engine oil supply pipe 14 disposed in the middle of the engine oil supply pipe 14, detects the oil level position of the oil float 17 from the engine oil tank 11. Such as an engine oil supply valve 15 that controls the supply of engine oil to the oil pan 16. It made.
[0022]
The engine oil tank 11 is installed above an engine main body 21 described later. The reason will be described in detail below.
[0023]
The engine body 21 is driven by being lubricated with engine oil stored in an oil pan 24 disposed below the engine body 21. When the engine body 21 is driven, the engine oil is not shown in a combustion chamber of the engine body 21 (not shown). Combusted and consumed with fuel.
[0024]
Therefore, engine oil must be continuously supplied.
[0025]
Therefore, the diesel engine outdoor unit 100 has a mechanism for automatically supplying engine oil from the engine oil tank 11 to the oil pan 24 in order to make the oil supply interval of the engine oil as long as possible.
[0026]
The operation of this mechanism will be described in detail below. A sub oil pan 16 that continuously supplies engine oil to the oil pan 24 is provided between the engine oil tank 11 and the oil pan 24.
[0027]
Then, the oil float 17 is floated on the engine oil stored in the sub oil pan 16 to constantly detect the oil level of the engine oil.
[0028]
When the oil float 17 is lowered to a predetermined position, the oil supply valve 15 provided in the middle of the oil supply pipe 14 that automatically connects the engine oil tank 11 and the sub oil pan 16 is opened for a predetermined time.
[0029]
When the oil supply valve 15 is opened for a predetermined time, the engine oil automatically flows from the engine oil tank 11 into the sub oil pan 16 by gravity.
[0030]
In order to maintain and configure this mechanism, when the engine supply valve 15 is opened, the engine oil must flow automatically by gravity, so the engine oil tank 11 is installed above the engine body 21. The
[0031]
The above is the reason why the engine oil tank 11 is installed above the engine body 21.
[0032]
Next, the configuration of the engine system unit 20 will be described. The engine system unit 20 lubricates an engine body 21, a starter 22 that starts the engine body 21, a tachometer 23 that measures the rotational speed of the engine body 21, and a drive unit (not shown) inside the engine body 21. An oil pan 24 that supplies engine oil, a feed pump (not shown) that pumps up fuel, a fuel injection pump 25 that injects fuel into a combustion chamber (not shown) inside the engine body 21, a fuel injection pump 25, and a fuel pipe 203. The air vent valve 26 that removes air accumulated in the fuel supply path including the fuel supply path, the air vent valve 26 and the engine oil tank 11 described above are communicated, and the air vented by the air vent valve 26 is engine oil. It consists of an air vent pipe 27 that leads into the tank 11.
[0033]
Here, the air vent pipe 27 connecting the air vent valve 26 and the engine oil tank 11 will be described in detail.
[0034]
When the conventional air vent valve that directly discharges air to the atmosphere when opened, the fuel leaks out together with the air accumulated in the fuel injection pump 25, and the diesel engine outdoor unit 100 is installed. Had contaminated the surrounding environment.
[0035]
However, in the present invention, the air vent valve 26 and the engine oil tank 11 installed above the air vent valve 26 are communicated with each other through the air vent pipe 27, and the air and fuel leaking from the air vent valve 26 are connected to the engine. It leads into the oil tank 11.
[0036]
As a result, the fuel leaking from the air vent valve 26 is mixed with the engine oil in the engine oil tank 11, and the air is released to the atmosphere from the air vent 12 provided in the engine oil tank 11. It becomes possible to reduce pollution of the surrounding environment where the engine type outdoor unit 100 is installed.
[0037]
With the configuration described above, the engine oil in the engine oil tank 11 and the fuel leaking from the air vent valve 26 are mixed, but the total amount of fuel leaking is relatively small (3 cc to 5 cc). Even if a small amount of fuel is mixed with the engine oil stored in the engine oil tank 11, no significant change occurs in the quality of the engine oil, so there is no problem in the overall operation of the diesel engine type outdoor unit 100. .
[0038]
Thus, the air vent pipe 27 plays a role of reducing pollution of the surrounding environment where the diesel engine type outdoor unit 100 is installed.
[0039]
The starter 22, the tachometer 23, and the air vent valve 26 described above are electrically connected to the control device 40. The starter 22 controls the engine body 21 based on a control signal from the control device 40. Start.
[0040]
Incidentally, the engine body 21 corresponds to a diesel engine shown in the claims.
[0041]
Similarly, the tachometer 23 transmits the measured number of revolutions of the engine body 21 per unit time to the control device 40, and the air vent valve 26 is automatically opened and closed based on a control signal from the control device 40. Operate.
[0042]
This control device 40 is an ECU composed of a well-known CPU, RAM, ROM, and the like, and is electrically connected to a speaker 41 for informing that when the engine body 21 is not started by the starter 22. . The control device 40 corresponds to the control means described in the claims.
[0043]
Further, a fuel supply system unit 200 that supplies fuel to a fuel injection pump 25 that injects fuel into the engine body 21 is disposed adjacent to the diesel engine type outdoor unit 100 described above.
[0044]
The fuel supply system unit 200 includes a fuel tank 201 having an air vent pipe 202, an air vent port 202 for venting air from the fuel tank 201, a fuel pipe 203 for supplying fuel from the fuel tank 201 to the fuel injection pump 25 described above, and The fuel filter 204 is provided in the middle of the fuel pipe 203 and removes air and dust mixed in the supplied fuel, and excess fuel that has not entered the combustion chamber in the engine body 21 is removed from the fuel tank 201. The return pipe 205 is returned to the phase section 201a.
[0045]
The operation of the diesel engine type outdoor unit 100 configured as described above will be described with reference to the flowchart of FIG.
[0046]
In step S1, it is determined with reference to the engine speed measured by the tachometer 23 whether or not the engine body 21 is in the stalled state. If it is in the stalled state, the process proceeds to step S2. The processing content of this step S1 corresponds to the engine stall determination means shown in the claims.
[0047]
As described above, the processing content of the engine stall determination means of the present invention shown in step S1 determines whether or not the engine stall is based on the measured value of the engine speed of the tachometer 23. For example, it may be determined whether the engine is in the engine stall state based on the temperature of the combustion chamber, the exhaust amount of exhaust gas, or the like.
[0048]
In step S2, the air bleeding valve 26 is automatically opened and at the same time the opening time T is initialized (T = 0).
[0049]
When the air vent valve 26 is opened, if air has accumulated in the fuel supply path including the fuel injection pump 25 and the fuel pipe 203, the accumulated air passes through the air vent valve 26 that has been automatically opened, It is guided to the extraction tube 27.
[0050]
The air guided to the air vent pipe 27 automatically reaches the engine oil tank 11 installed above the engine body 21 by its own buoyancy, and is released here.
[0051]
In step S3, it is determined whether or not the opening time T of the air bleeding valve 26 has passed a predetermined time (30 seconds in this embodiment), and if it has passed, the process proceeds to step S4.
[0052]
In step S4, the starter 22 is started to start the engine body 21. The processing content of this step S4 corresponds to the starter starting means shown in the claims.
[0053]
If it is determined in step S5 that the engine body 21 has been started by starting the starter 22 in step S4, the process proceeds to step S6. If not, the process proceeds to step S7.
[0054]
The processing content of step S5 corresponds to the determination means shown in the claims. As specific processing contents of this determination means, for example, it may be determined that the engine speed measured by the tachometer 23 is a predetermined number of times per unit time or combustion. It may be determined whether or not the engine body 21 has been started based on the room temperature of the chamber or the exhaust amount of the exhaust gas.
[0055]
In the flowchart shown in FIG. 2, the starter 22 is started only once in step S <b> 4, but the engine body 21 may not start only once, so the number of starters 22 is set in advance, It may be determined whether or not the engine body 21 has started within the set number of starts.
[0056]
If the engine main body 21 is started in step S5, the air vent valve 26 opened in step S2 in step S6 is automatically closed.
[0057]
If the engine main body 21 has not been started in step S5, a notification to that effect is given from the speaker 41 in step S7. This processing content of step S7 corresponds to the notification means shown in the claims.
[0058]
In the present embodiment, the notification that the engine 21 has not started is exemplified from the speaker 41, but it may be notified to a remote place via an electrical communication network.
[0059]
With the above-described configuration and operation, even if the engine main body 21 is in an engine stalled state due to air mixed into the fuel, the mixed air is automatically removed without causing pollution of the environment, and the engine main body 21 is automatically removed. It is possible to provide a diesel engine type outdoor unit 100 that can be restarted.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a configuration of a diesel engine type outdoor unit 100 according to an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the diesel engine type outdoor unit 100 according to the embodiment of the present invention.
[Explanation of symbols]
10 Oil supply system unit 11 Engine oil tank 20 Engine system unit 21 Engine body (diesel engine)
25 Fuel injection pump 26 Air vent valve 27 Air vent pipe 30 Compressor 40 Control device (control means)
41 Speaker 201 Fuel tank (fuel supply path)
203 Fuel pipe (fuel supply path)

Claims (5)

A diesel engine that transmits the rotational driving force of the air conditioner compressor;
An oil tank that is installed above the diesel engine and stores engine oil supplied to the diesel engine;
A fuel supply path to a fuel injection pump for injecting fuel to the diesel engine, and an air vent pipe communicating with the oil tank;
A diesel engine type outdoor unit comprising: an air vent valve that draws air mixed in the fuel in the fuel supply passage from the fuel supply passage through the air vent pipe. The diesel engine type outdoor unit according to claim 1, further comprising a control unit that opens the air vent valve for a predetermined time when the diesel engine is stopped. The control means includes an engine stall determination means for determining whether or not the diesel engine is in an engine stall state, and the air vent valve for a predetermined time when a determination result of the engine stall determination means is in the engine stall condition. The diesel engine type outdoor unit according to claim 2, further comprising an air vent valve opening / closing control means for opening the air vent valve. The diesel engine has a starter for starting the diesel engine, and the control means starts the starter for starting the starter after the air vent valve opening / closing control means opens the air vent valve for the predetermined time. The diesel engine type outdoor unit according to claim 2 or 3, further comprising means. The control means includes determination means for determining whether or not the diesel engine has been started by the starter starting means, and notification means for notifying that when the determination means determines that the diesel engine has not started. The diesel engine type outdoor unit according to any one of claims 2 to 4.

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