JPH0337331A - Engine warm-up promotion device for engine generator - 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] (Industrial Application Field) The present invention relates to a device for promoting warm-up of an engine of an engine generator, and is a technology that can achieve both early input of electric power load and prevention of reduction in engine life. .

(Prior Art) Conventional engine generators are configured to be unloaded during a warm-up period after a cold start.

(Problem to be solved by the invention) The above conventional structure has the following problems.

(a) Since engine warm-up is under no load, the amount of heat generated is small and takes time. Therefore, it is necessary to wait a relatively long warm-up period after starting the engine and before applying the electric power load.

(b) In general, in engine generators, after the engine starts,
The power load may be turned on early to start work. If a medium to high load is applied during the above-mentioned relatively long warm-up operation, abnormal wear and seizure of the sliding surfaces are likely to occur due to delayed thermal expansion and thermal distortion of the cylinder piston. This will shorten the life of the engine.

An object of the present invention is to shorten engine warm-up operation time and to prevent reduction in engine life.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by the following configuration.

For example, as shown in FIG. 1 or FIG. 2, a warm-up promotion load means is interlocked and connected to at least one of the engine 4 and the generator 5 of the engine generator 2 via the power intermittent means A, and the The intermittent means A is linked to the warm-up end temperature detecting means B, and the warm-up end temperature detecting means B disconnects and connects the power to the power intermittent means based on detecting the temperature of the engine 4. If the detected temperature is lower than the set temperature for finishing warm-up, the power intermittent means Δ is connected, whereas when the detected temperature is higher than the set temperature for finishing warm-up, the power cutting-off means A is disconnected. It is configured as follows.

Note that a compressor, a radiator fan, etc. attached to the engine generator can be considered as the warm-up promoting load means.

Further, the following can be considered as the power intermittent means.

When the warm-up promotion load means is driven by the generator 5,
An electromagnetic switch is considered. On the other hand, when the warm-up promotion load means is directly driven by the engine 4, an electromagnetic clutch may be used.

Further, as the warm-up end temperature detection means B, the engine 4
Possible options are to detect the atmospheric temperature or aircraft temperature, or to detect the temperature of the engine coolant.

(effect) The invention works as follows.

When starting the engine 4 cold, the warm-up end temperature detection means B
detects that the detected temperature is lower than the set temperature for finishing warm-up, connects the power intermittent means A, and turns on the engine 4.
When the engine starts, the warm-up promotion load means is driven.

Since the engine 4 generates more heat by driving the warm-up promotion load means, warm-up is quickly promoted and the time required for warm-up is shortened.

In addition, even if a medium to high power load is applied soon after the engine generator 2 is started, the engine 4 has already warmed up by the time it is applied, and thermal expansion against the piston of the cylinder occurs. Since delays and thermal distortions are eliminated, the piston sliding surface does not suffer from abnormal wear or seizure, and does not shorten its life.

Note that when the temperature detected by the warming-up end temperature detection means B becomes higher than the set temperature for warming up as the carrot 4 is warmed up,
Since the power intermittent means A is disconnected and the operation of the warm-up promotion load means is stopped, the engine generator 2 does not need to waste power.

(Effects of the Invention) The present invention has the following effects because it is configured and operates as described above.

(b) Even if the power generation load of the engine generator is zero or low, the warm-up promotion load means increases the amount of heat generated by the engine and promotes warm-up, so the time required for warm-up is shortened. .

(b) Even if a power load of medium to high load or more is turned on early after the engine generator starts, the carrot has already warmed up by the time it is turned on, so abnormal wear of the piston etc. The life of the engine will not be shortened due to this.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

(First Example) FIG. 1 is a flow sheet showing a heat-accompanied power generation device, in which an exhaust heat recovery device 3 is attached to an engine generator 2 within a soundproof case l.

This heat-accompanied power generation device drives a generator 5 with a gas engine 4 to supply power to an external power load from a power supply terminal 6, and at the same time, the exhaust heat of the gas engine 4 is transferred to an exhaust heat recovery device 3.
The hot water in the hot water circulation path 8 is recovered directly through the hot water circulation path 8.

Note that reference numeral 10 is a fuel gas supply path, reference numeral 11 is a battery, and reference numeral 12 is an electric control panel. Further, the hot water circulation path 8 is configured so that hot water in the hot water tank 14 is circulated by a hot water circulation pump 15.

The above device operates as follows under normal exhaust heat recovery conditions.

Water jacket due to operation of gas engine 4) 17
After the engine cooling water (heat recovery fluid) that has absorbed heat is heated in the exhaust heat absorption heat exchanger 18 and its temperature rises, it passes through the variable flow dividing valve 19 and almost all of it is transferred to the exhaust heat recovery heat exchanger 2.
0 (solid line arrow), heat is radiated here to heat the hot water in the hot water circulation path 8, and the engine coolant circulation pump 22
is returned to the inlet of the water jacket 17. Note that after the exhaust gas is cooled by the exhaust heat absorption heat exchanger 18,
It is discharged from the muffler 24 to the outside. Furthermore, when the engine 4 is started cold, engine cooling water is returned from the thermostatic valve 26 to the inlet of the circulation pump 22 via the bypass path 27, thereby shortening the warm-up time.

On the other hand, in the above exhaust heat recovery state, if the amount of exhaust heat recovery decreases due to a decrease in the heat load of the hot water tank 14, etc., and the temperature of the engine cooling water rises to a predetermined temperature or higher, the engine 4 is protected. Then, the heat of the engine cooling water is radiated by the radiator 29. That is, a part of the engine cooling water from the exhaust heat absorption heat exchanger 18 is also supplied to the radiator 29 through the variable distribution valve 19 (dashed arrow), where it is cooled by the cooling air of the radiator fan 30. , circulation pump 2
2 and returned to the water jacket 17.

The variable flow dividing valve 19 is configured to control the flow dividing ratio by a heat radiation control device (not shown) comprising an engine cooling water temperature detection means and a flow dividing valve operating means. Further, the radiator fan 30 is connected to the generator 5 via a fan drive control device 31. The fan drive control device 31 operates and stops the radiator fan 30 based on the detected value of the engine cooling water temperature detection means.

In the above configuration, the engine 4 is provided with a warm-up promotion device.

That is, an electric compressor 33 (warm-up promotion load means L) is interlocked and connected to the generator 5 via an electromagnetic switch 32 (power intermittent means A). This compressor 33 is arranged inside the soundproof case 1, and can heat the air inside the soundproof case 1 by its compression operation.

Further, the electromagnetic switch 32 has a case internal temperature detection means 34 (
This is in cooperation with the warm-up end temperature detection means B).

The case internal temperature detection means 34 is provided near the outer circumferential surface of the engine 4, and disconnects and connects the electromagnetic switch 32 based on detecting the ambient temperature of the engine 4.

The warm-up accelerator described above operates as follows.

When the engine 4 is started, if the air temperature inside the soundproof case l is sufficiently high and the temperature detected by the case internal temperature detection means 34 is higher than the set temperature for warming up, the electromagnetic switch 32 is operated to disconnect. Therefore, even if the generator 5 starts generating electricity when the engine 4 is started, the compressor 33 is stopped.

On the other hand, when the engine 4 is started, if the air temperature inside the soundproof case 1 is low and the temperature detected by the case internal temperature detection means 34 is lower than the set temperature for warming up, the electromagnetic switch 32 is activated. Connection operation is performed. Thereby, when the engine 4 starts, the compressor 33 is driven via the generator 5, and the warm-up of the engine 4 is promoted by the load. In this case, the air inside the soundproof case 1 is heated by the compression operation of the compressor 33, so that warm-up of the engine 4 is further promoted.

As the engine 4 warms up, the ambient temperature near the outer surface of the engine increases, and when the temperature detected by the case internal temperature detection means 34 becomes higher than the set temperature for warming up, the electromagnetic switch 32
is cut off, and the driving of the compressor 33 is stopped. During the engine warm-up promotion period, the amount of heat generated by the engine 4 also increases, and recovery of engine exhaust heat can also be promoted, making it possible to start hot water supply early.

In this first embodiment, the electric compressor 33 is driven by the generator 5, but the compressor may be driven directly by the power output shaft of the engine 4. In this case, it is preferable to use an electromagnetic clutch as the power intermittent means B.

(Second Embodiment) FIG. 2 shows a second embodiment, and a different configuration from the first embodiment will be explained. Note that devices having the same functions as those in the first embodiment are given the same reference numerals.

In this case, the radiator fan 30 is used as a load means for promoting warm-up.

That is, the radiator fan 30 is connected to the generator 5 via the fan drive control device 31 as described above. An electromagnetic switch 38 (power intermittent means A) is provided in parallel with this fan drive control device 31. The electromagnetic switch 38 is linked to the engine cooling water temperature detection means 39 (warm-up end temperature detection means B). This engine cooling water temperature detection means 39 is
The electromagnetic switch 38 is disconnected and connected based on the detection of the temperature of the cooling water of the engine 4.
It works as follows.

At the time of starting the engine 4, if the temperature detected by the engine cooling water temperature detection means 39 is lower than the set temperature for warming up, the electromagnetic switch 38 is connected. This results in
When the engine 4 starts, the radiator fan 30 is forcibly driven via the generator 5, and the warm-up of the engine 4 is promoted by its load. Note that during the period until the warm-up of the engine 4 is completed, the engine cooling water flows from the thermostatic pulp 26 to the bypass path 27 and does not flow to the radiator 29, so the engine cooling water is It does not happen that the water gets cooled.

As the engine 4 warms up, the temperature of the engine coolant increases, and when the temperature detected by the engine coolant temperature detection means 39 becomes higher than the set temperature for warming up, the electromagnetic switch 38 is disconnected, and the radiator fan 30 forced operation will be stopped. During the engine warm-up promotion period, the amount of heat generated by the engine 4 also increases, and recovery of engine exhaust heat can also be promoted, making it possible to start hot water supply early.

Note that in this second embodiment, the electric radiator fan 3
Although the radiator fan is driven by the generator 5, the radiator fan may be directly driven by the power output shaft of the engine 4. In this case, it is preferable to use an electromagnetic clutch as the power intermittent means B.

[Brief explanation of drawings]

FIG. 1 is a flow sheet showing a first embodiment of the present invention. FIG. 2 is a flow sheet showing a second embodiment of the present invention. 2... Engine generator, 4... Engine, 5...
Generator, A: Power intermittent means, B: Warm-up end temperature detection means, L: Warm-up promotion load means.

Claims (1)

[Claims] 1. The engine (4) of the engine generator (2) and the generator (
Warming-up promotion load means (L) is interlocked and connected to at least one of 5) via a power intermittent means (A), and the power intermittent means (A) is linked to the warm-up end temperature detecting means (B). The warm-up end temperature detection means (B) disconnects and disconnects the power intermittent means (A) based on detecting the temperature of the engine (4).
If the detected temperature is lower than the set temperature for finishing warm-up, the power intermittent means (A) is connected, whereas the detected temperature is higher than the set temperature for finishing warm-up. 1. An engine warm-up promotion device for an engine generator, characterized in that the device is configured to disconnect the power intermittent means (A) in some cases.