JP3591923B2 - Engine filter replacement device and its replacement method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a filter replacement device for an engine and a replacement method thereof, and more particularly to a filter replacement device for an engine that replaces a filter while operating the engine and a replacement method thereof.
[0002]
[Prior art]
Conventionally, lubricating oil and a filter replacement device used in a diesel engine for a commercial generator will be described with reference to FIGS. FIG. 4 shows the configuration of the overall system of the fuel injection device 20 of the engine that is generally adopted. In FIG. 4, a feed pump 22 is connected from a fuel tank 21 by a pipe 23. A priming pump 24 is provided above the feed pump 22. The feed pump 22 and the filter 25 are connected by a pipe 26. An air release valve 27 is screwed on the upper part of the filter 25. The filter 25 and the fuel injection pump 28 are connected by a pipe 29. The fuel injection pump 28 and the injection nozzle 30 are connected by an injection pipe 31. The injection nozzle 30 and the fuel tank 21 are connected by a return pipe 32.
[0003]
Next, the flow of the fuel is sucked up from the fuel tank 21 through the pipe 23 by the feed pump 22, and is pumped to the fuel filter 25 through the pipe 26. The fuel is filtered by a filter 25 for foreign matter (dust, metal powder, etc.) in the fuel, and sent to a main body gallery of the fuel injection pump 28 via a pipe 29. The fuel is pumped by a fuel injection pump 28 with a plunger and a camshaft (not shown) to a high pressure, and is fed through an injection pipe 31 to injection nozzles 30 disposed in each cylinder. The injection nozzle 30 injects an amount required for the engine into the combustion chamber, and the remaining fuel passes through the circuit of the fuel return pipe 32 and returns to the fuel tank 21.
[0004]
The replacement of the filter 25 will be described with reference to FIG. To replace the filter 25, the engine is stopped, the container of the filter 25 is removed, and a filter element (not shown) in the filter 25 is replaced with a new one. After the replacement, the air remaining in the filter 25 and the fuel pipe is discharged. The air is discharged as follows. First, (1) the air release valve 27 screwed on the upper part of the filter 25 is loosened. (2) The fuel is pressurized by loosening the screw on the upper part of the priming pump 24 attached to the upper part of the feed pump 22 and reciprocating the piston by hand, and the air is released from the air release valve 27. (3) After releasing the air, close the air release valve 27.
[0005]
FIG. 5 shows the entire system of the lubricating device 30 of the diesel engine. In FIG. 5, lubricating oil is stored in an oil pan 31, and an oil strainer 32 and an oil pump 33 are connected by a pipe. The oil pump 33 is branched in two directions from a pipe 35 at the discharge port, and one of them is branched from a point in the pipe 35 and connected to a bypass filter 36 by a pipe 37. An orifice is provided on the outlet side of the bypass filter 36, and is connected to the oil pan 31 by a pipe 38. The other end of the outlet of the oil pump 33 from the pipe 35 is connected to an oil cooler 39. The oil cooler 39 and the oil filter 41 are connected by a pipe 42. The oil filter 41 is provided with a bypass valve 41a. The oil filter 41 and an oil gallery 43 supplied to each lubricating portion of the engine are connected by a pipe 44. A regulator valve 45 is provided from the pipe 44, and a safety valve 46 is provided from the pipe 35.
[0006]
Next, the flow of the lubricating oil will be described. The lubricating oil is stored in an oil pan 31 and is sucked up by an oil pump 33 from an oil strainer 32 through a pipe 34. The lubricating oil from the oil pump 33 is divided into two directions, one of which circulates a small amount of oil through a pipe 37 to a bypass filter 36 to filter carbon having a small filtration particle diameter and insoluble substances. The other lubricating oil goes from the pipe 35 to the oil cooler 39, and from the oil cooler 39 goes to the oil filter 41 via the pipe 42 to filter the lubricating oil, and is supplied to each lubricating portion of the engine via the pipe 44. Go to gallery 43. The oil filter 41 filters carbon and undissolved substances whose trapped particle diameter that directly enters each lubricating portion of the engine is larger than that of the bypass filter 36.
[0007]
Next, replacement of the lubricating oil filter will be described. The function of replacing the oil filter 41 and the bypass filter 36 deteriorates due to clogging as the operating time of the engine elapses. Therefore, similarly to the fuel filter 25, the engine is stopped and replaced with a new one.
[0008]
[Problems to be solved by the invention]
However, in the case of products equipped with an engine, the functions of the engine oil and the filter are deteriorated or deteriorated as the operation time elapses. The operation of the engine is stopped every time this periodic replacement is performed. For this reason, when the product driven by the engine is an engine generator, a cogeneration system (hot water, co-generation system), or the like, the engine operates continuously for 24 hours, and the stoppage of the operation causes the following problems.
(1) Electricity of the generator must be switched to commercial power.
(2) The co-generation system cannot use hot water other than electricity.
(3) The replacement work has a relatively small operation load depending on how the product is used, and is often performed at midnight, which places a burden on the workers. In addition, since the filter is replaced after the engine is stopped, the oil and cooling water temperatures are lowered and then the filter is replaced, and then the warm-up operation is started and the operation is started, a large amount of time is spent for replacement.
(4) If the air release becomes uncertain at the time of replacement, air enters the fuel system in the fuel filter, causing failures such as engine stop and fluctuations in engine speed (in the case of a generator, it leads to a change in the frequency of electricity). Therefore, especially strict rotation speed control is performed.) In addition, a lubricating filter may cause a failure due to a fluctuation in hydraulic pressure or poor lubrication, so that skilled maintenance skills are required. There is a problem.
[0009]
The present invention relates to an engine filter replacement device and a replacement method thereof having the above-mentioned conventional problems. In particular, the filter can be replaced at any time without stopping the engine, and the replacement time can be reduced as compared with the conventional case. Further, an object of the present invention is to improve a filter replacement device and a replacement method thereof, which can easily and reliably replace the filter.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the invention of the engine filter replacement device of the present invention, when the filter is replaced while rotating the engine, the first filter that operates while the engine is operating and the second filter that operates when the engine is replaced And a supply switching three-way valve provided between the discharge port of the pump of the engine and the inlets of the first filter and the second filter, and a filter for connecting the first filter and the second filter to the engine. A three-way valve for return switching provided between the return and a three-way valve for the first filter and the three-way valve for return, and a two-way valve between the second filter and the three-way valve for return switching are provided.
[0011]
In the invention of the engine filter replacement method, a step of flowing the first filter during operation, a step of flowing a small amount of return oil of the first filter to the second filter while flowing the first filter during replacement, and It consists of a step of removing air from the filter, a step of switching the flow rate to the second filter from a very small amount to a fully open flow rate, a step of switching a flow rate from the first filter to the second filter, and a step of replacing the first filter. It is characterized by the following.
[0012]
[Action]
According to the above exchange device and the exchange method thereof, when exchanging the filter without stopping the engine, the filter exchange of the engine having the first filter that operates while the engine is operating and the second filter that operates when the engine is exchanged. In the apparatus, the first filter is flowed during operation, and a small amount of return oil of the first filter is flown to the second filter while the first filter is flown at the time of replacement, and the air accumulated in the second filter is removed. Thereafter, the flow rate to the second filter is switched from a very small amount to a fully open flow rate. Thereafter, the flow rate from the first filter to the second filter is switched, and the first filter is replaced. With the replacement device and the replacement method, the filter can be replaced without stopping the engine. In the above, the flow between the first filter and the second filter can be changed mainly by opening and closing the valve. In addition, since air can be removed from the filter by using oil from a pump driven by the engine, the operation is facilitated and can be performed reliably.
[0013]
【Example】
Hereinafter, an engine filter replacement device and method according to the present invention will be described in detail with reference to the drawings. The same parts as those in the related art are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 is an overall configuration diagram of an engine filter replacement device, and FIG. 2 is a partial view of a filter for explaining a flow at the time of filter replacement.
In FIG. 1, the filter exchange device 1 shows a fuel flow circuit when the first filter is operated. In the following, the flow of the fuel is considered to be mainly the filter, the flow from the feed pump 22 to the filter is referred to as "supply" as a supply circuit, and the flow from the filter to the injection pump 25 is referred to as "return" as a return circuit. I'm calling
[0014]
First, in a fuel supply circuit (solid line in the figure), a feed pump 22 and a supply switching three-way valve 2 are connected by a pipe 3. One side 2 a of the supply switching three-way valve 2 is connected to the first filter 4 via a pipe 5. The other 2b of the supply switching three-way valve 2 is connected to a second filter 6 (hatched in the figure) by a pipe 7. The first filter 4 and the second filter 6 have air bleeding valves 4a and 6a, respectively, and transparent vinyl tubes 4b and 6b are piped.
[0015]
On the fuel return circuit side (dotted line in the figure), the first filter 4 and one of the return switching three-way valves 8 are connected by a pipe 9. The second filter 6 and the other 8 b of the return switching three-way valve 8 are connected by a pipe 10. A point A in the middle of the pipe 9 and a B point in the middle of the pipe 10 are connected by pipes 11 and 12, and a two-way valve 13 is provided between the pipe 11 and the pipe 12. The return switching three-way valve 8 is connected to the fuel injection pump 25 via the pipe 14.
[0016]
Next, the operation will be described with reference to FIG. 1, FIG. 2, and FIG. FIG. 2 shows a state in which the fuel is flowing through the second filter 6. FIG. 3 is a diagram for explaining an opening state of the two-way valve 13 when switching from the first filter 4 to the second filter 6.
The fuel discharged from the feed pump 22 passes through the pipe 3 to the supply switching three-way valve 2. The fuel that has exited one of the supply switching three-way valves 2a passes through the pipe 5 and goes to the first filter 4. The fuel filtered by the first filter 4 passes through the return pipe 9 and goes to one of the return switching three-way valves 8a. The fuel exiting the return switching three-way valve 8 flows through the return pipe 14 to the gallery of the injection pump 25.
[0017]
Next, the flow when the second filter 6 operates will be described with reference to FIG. At this time, the supply switching three-way valve 2 and the return switching three-way valve 8 are switched.
As in the case of the first filter operation, the fuel discharged from the feed pump 22 passes through the pipe 3 to the supply switching three-way valve 2. The fuel that has exited the other 2b of the supply switching three-way valve 2 passes through the pipe 7 and goes to the second filter 6. The fuel filtered by the second filter 6 passes through the return pipe 10 and goes to the other 8 b of the return switching three-way valve 8. The fuel exiting the return switching three-way valve 8 flows through the return pipe 14 to the gallery of the injection pump 25.
[0018]
Next, a description will be given of a filter replacement method, for example, switching to a second filter 6 in which a first filter 4 is operated and a new filter element is replaced.
The replacement method is as follows.
During operation, it is flowing through the first filter 4 of FIG.
Next, while returning the fuel to the first filter 4, the return fuel of the first filter 4 is set to a process of flowing a small flow rate to the second filter 6. That is, the two-way valve 7 in FIG. 3A is changed from the “closed” position to the minute “open” position in FIG. 3B. As a result, the return fuel (Q) passes through the pipe 9 from the discharge port of the first filter 4, and the flow rate (R) branched at the point A in the middle of the pipe 9 enters the two-way valve 13 from the pipe 11. A small amount of fuel discharged from the two-way valve 13 passes through the branch at the point B from the pipe 12 and enters the second filter 6 from the pipe 10.
[0019]
Next, the process of removing air from the second filter 6 is performed. That is, the accumulation of air in the second filter 6 and the pipe 7 is discharged. Although the supply switching three-way valve 2 is shown above the second filter 6 in the drawing, air may be discharged since the supply switching three-way valve 2 may be arranged side by side. At this time, the vent valve 6 a filter 6 from "closed" to "open", the transparent is attached to the valve tip end vinyl - from Ruchubu 6b Air - Disconnect the fuel is discharged, air vent is completed At this point, the valve is changed from "open" to "closed".
[0020]
Next, a process is performed in which the flow rate to the second filter is switched from a minute amount to a fully opened flow rate. This causes the two-way valve 13 to move from the minute "micro-open" position of FIG. Thereby, the second filter 6 and the pipe 7 are connected to the pipe 9 via the pipe 10, the pipe 12, the two-way valve 13, and the pipe 11, and are filled with fuel.
[0021]
Next, a process for switching the flow from the first filter to the second filter is performed. This means that the levers of the supply switching three-way valve 2 and the return switching three-way valve 8 are simultaneously turned 90 degrees with both hands. Thus, the supply switching three-way valve 2 switches the flow from one side 2a to the other side 2b, and the return switching three-way valve 8 switches the flow from one side 8a to the other side 8b. The fuel flows from the other 2b of the supply switching three-way valve 2 to the pipe 7, the second filter 6, and the pipe 10. At the time of this switching, fuel flows through the switching three-way valve 8 through the pipe 10, the pipe 12, the two-way valve 13, the pipe 11, and the pipe 9 to one 8a of the switching three-way valve 8, and the switching from the pipe 10 Since the fuel flows to the other side 8b of the three-way valve 8, the fuel comes to both ports 8a and 8b. Therefore, the fuel flows through the return switching three-way valve 8 to the main body gallery of the injection pump 25 without interruption even during the switching of the return switching three-way valve 8. Next, the two-way valve 13 is moved from the “fully opened” position to the “closed” position in FIG.
[0022]
In the above description, an example was described in which the levers of the supply switching three-way valve 2 and the return switching three-way valve 8 were simultaneously turned 90 degrees with both hands, but after the supply switching three-way valve 2 was turned 90 degrees, the return was performed. The three-way switching valve 8 may be turned 90 degrees.
At this time, by setting the two-way valve 13 to “full open”, the fuel passes through the pipe 10, the pipe 12, the two-way valve 13, the pipe 11, the pipe 9, and the switching three-way valve 8 a and the main body of the injection pump 25. It is flowing to the gallery. Next, the return switching three-way valve 8 is turned by 90 degrees, and the fuel flows into the main body gallery of the injection pump 25 via the pipe 10 and the switching three-way valve 8b. As a result, even if the return switching three-way valve 8 is switched late, the fuel flows to the main body gallery of the injection pump 25 without interruption.
In this state, the first filter is replaced.
[0023]
In the above description, an example of switching from the first filter to the second filter has been described, but it goes without saying that switching from the second filter to the first filter is the same.
As described above, the filter replacement device for the fuel injection device and the replacement method thereof have been described as one embodiment of the filter replacement device for the engine and the replacement method thereof according to the present invention. Applicable. Since the exchange device and the exchange method are the same, the description is omitted.
[0024]
【The invention's effect】
As described above, according to the present invention, it is possible to replace the filter without stopping the engine. Therefore, the engine of the engine service generator or the cogeneration system (hot water, electric co-supply device) product As a result, the commercial power supply is not switched due to the stoppage, and the hot water can be used continuously. In addition, the replacement work was often performed at midnight with a relatively low operating load in conventional products, but this improvement allows it to be performed at any time, and after stopping the engine, lowering the temperature of oil and cooling water Since the replacement and subsequent warm-up operation are eliminated, the replacement time can be greatly reduced, and an excellent effect that the air bleeding operation at the time of replacement can be easily and reliably obtained.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a filter replacement device for a fuel injection device of the present invention.
FIG. 2 is a view showing a filter unit when a second filter is operated in the filter replacement device of the fuel injection device of the present invention.
FIG. 3 is a diagram illustrating opening and closing of a two-way valve of the filter replacement device of the fuel injection device of the present invention.
FIG. 4 shows a system diagram of a conventional fuel injection device.
FIG. 5 shows a system diagram of a prior art lubrication device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 filter exchange device 2 supply switching three-way valve 4 first filter 4a, 6a air release valve 6 second filter 8 return switching three-way valve 13 two-way valve 21 fuel tank 22 feed pump 24 priming pump 25 injection pump 30 injection nozzle

Claims (2)

When a filter is replaced while the engine is running, an engine filter replacement device having a first filter that operates while the engine is running and a second filter that operates when the engine is replaced. Supply switching three-way valve provided between the first filter and the second filter, and a return switching three-way valve provided between the first and second filters and the return to the engine; and a first filter and a return switch. A filter exchange device for an engine, comprising a three-way valve for use, and a two-way valve provided between the second filter and the three-way valve for return switching. An engine filter replacement method for replacing a filter such as fuel and lubricating oil while rotating the engine,
(1) The process of flowing the first filter during operation,
(2) a process of flowing a small amount of return oil from the first filter to the second filter while flowing the first filter during replacement;
(3) The process of bleeding air from the second filter,
(4) a process of switching the flow rate to the second filter from a very small amount to a fully open flow rate;
(5) a process of switching the flow rate from the first filter to the second filter;
(6) The process of replacing the first filter,
A method of replacing a filter of an engine, comprising:

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