JPH0565196A - Oil feeding method - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the shock when stopping high-speed refueling. [Structure] A discharge pipe of a second pump is connected to a discharge pipe of a first pump, and a large-capacity first valve and a small-capacity second valve are connected in parallel to the discharge pipe of the second pump. First, the first and second pumps are used to refuel, the first pump is stopped before reaching the preset amount, and when the preset amount is approached, the first valve is closed and the second valve is opened at the preset amount. close.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed or large discharge amount preset lubrication method.

[0002]

2. Description of the Related Art A high-speed lubricator equipped with two pumps
It is disclosed in Japanese Utility Model Publication No. 51-27887.

The prior art of preset lubrication is illustrated in part of FIG. 1 and FIG. 4, and the outline of the operation will be described with reference to these figures.

FIG. 1 shows a so-called high / low common oil supply device. When an operator removes the second nozzle 5b from the nozzle hook when supplying oil at a low speed, that is, at a low discharge amount, a second nozzle switch SW2 is provided. Turns on (step S2
0), the controller 8 resets the second indicator 7b to zero, the third,
The fourth valves V3 and V4 are opened, and the second pump motor PM2
Is turned on (step S21). In the case of preset refueling, a desired amount is set by the preset key 6b (step S22) until a predetermined amount, for example, 0.5 liter, is refueled (step S32). Then, the worker inserts the nozzle into the oil supply port and opens the nozzle valve to perform the preset oil supply. As the oil supply progresses, the second flow meter 3b
The refueling amount is calculated and displayed on the display 76 based on the signal from, and the control device 8 determines whether or not the refueling amount is a certain amount before the preset amount, for example, 0.7 liters before (step S23). ). When 0.7 liters before, the control device closes the third valve V3 in step S23 (step S25). As a result, a small amount of oil is supplied to the fourth valve V4 only. Next, the control device 8 determines whether or not the set amount has been reached (step S26). When the set amount is reached, the fourth valve V4 is closed and the second pump motor P
M2 is turned off (step S28). Then, the nozzle 5b is hung on the nozzle hook and the second nozzle switch SW2
When is turned off (step S29), the control ends.

If the preset amount is not reached before 0.5 liter of fuel is replenished (step S32), normal refueling is carried out, the refueling work is completed, and the second nozzle switch SW2
Is turned off (step S30), the third and fourth valves V3 and V4 are closed, and the second pump motor PM2 is turned off.
Set to F (step S31), and control ends. If the second nozzle switch SW2 is turned off by stopping the refueling in the middle of presetting (steps S24, 2
7) Then, each valve is closed and the pump motor is turned off (steps S33 and S34) to end the control.

[0006]

However, in such a conventional technique, when the preset amount is approached, the valve is closed in two steps, so that it is effective at a low discharge amount, but it is effective at a high discharge amount at a high discharge amount. The shock when the oil flow is cut off is large, and the equipment such as pumps and flow meters are damaged and not practical.

According to the present invention, in the case of preset lubrication at high speed, in a lubricator having two pumps and two valves, the amount of lubrication can be reduced in three steps to easily reduce the shock when throttled or stopped. The purpose is to provide a refueling method.

[0008]

According to the present invention, there is provided a first pump and a second pump, and a discharge pipe of the second pump has a large-diameter first valve and a small-diameter second valve. In the preset lubrication method of the lubrication system, in which the valve and the valve are connected in parallel and then connected to the discharge pipe of the first pump and connected to the lubrication hose through the flow meter, first, the first and second valves are opened. Both the first and second pumps are driven, the first pump is stopped by a predetermined amount before the preset amount, and the second pump is refueled, and another predetermined amount closer to the preset amount than the predetermined value is reached. The first valve is closed and the second valve is closed when the preset amount is reached.

[0009]

Therefore, it is possible to perform the flow rate control in three stages only by controlling the on / off of the first and second pumps and the opening and closing of the first and second valves, with almost no change or addition to the parts of the conventional device. Therefore, it is possible to reduce the shock caused by the change in the discharge amount during the high-speed, large-volume preset lubrication work, and prevent the deformation due to the pressure change of the water hammer and the piping.

[0010]

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

FIG. 1 shows an apparatus for carrying out the present invention. A suction pipe 1 from an underground tank (not shown) is branched and a first pump P1 driven by a first pump motor PM1.
The second pump P driven by the second pump motor PM2
2 is connected to. The discharge capacity of each pump P1, P2 is, for example, 90 liters / min. A first flowmeter 3a having a large capacity, for example, 180 liters / min, is installed in the discharge pipe 2a of the first pump P1 on one side, and a first nozzle is provided at an end thereof via a first hose 4a. 5a is connected. The discharge pipe 2b of the other second pump P2 has a capacity smaller than that of the first flow meter 3a, for example, 90 liter /
A second flowmeter 3b of min, a large-diameter third valve V3 and a small-diameter fourth valve V4, which are arranged in parallel, are provided, and a second hose 4b is provided at the end. And the second nozzle 5b is connected. In addition, the branch pipe 2c is branched from the second discharge pipe 2b, and the first discharge pipe 2a
Is connected to the upstream side of the flow meter 3a. The branch pipe 2c has a large-diameter first valve V1 and a small-diameter second valve V1.
Valve V2 of the above is interposed in parallel.

On the other hand, the first and second nozzle switches SW for detecting that the nozzles 5a, 5b have been removed from the fueling machine A
1, SW2 and first and second preset keys 6a, 6
b and b are provided and are respectively connected to the control device 8. The control device 8 includes first and second indicators 7a and 7b and the devices PM1, PM2, and V1 to V1.
4, 3a and 3b are respectively connected.

Next, an embodiment of the present invention will be described. An example of high-speed refueling is shown in FIGS. 2 and 3, and when the worker removes the first nozzle 5a from the refueling machine A, the nozzle switch SW1 is turned on (step S1), and the control device 8 is set to the first position. The display 7a of No. 1 is reset to zero, the first and second valves V1 and V2 are opened, and the first and second pump motors PM1 and PM2 are turned on.
Yes (step S2). In the case of preset refueling, a fixed amount, for example, 0.5 liter, is supplied (step S1
6) Set a desired amount with the preset key 6a (step S3). Then, when the worker inserts the nozzle 5a into the fuel filler port of the fuel tank and pulls the lever of the nozzle, high-speed refueling with a discharge amount of 180 liters per minute by both pumps P1 and P2 is performed (time T1 in FIG. 3). ~ T2). Therefore, the control device 8 calculates the refueling amount based on the signal from the first flow meter 3a and displays it on the display 7a, and whether the refueling amount is a predetermined amount, for example, 10 liters before the preset amount. It is determined (step S4). And 1
When it is before 0 liter, the first pump motor PM1 is turned off in step S4 (step S6 and time T2). As a result, refueling with a discharge amount of only the second pump P2, for example, 90 liters per minute is performed (time T2 to T3). After that, the control device 8 determines whether or not the preset amount has reached a predetermined amount, for example, 0.7 liters (step S7). Then, at 0.7 liters before, the first valve V1 is closed (step S9 and time T3). Thereby, the discharge amount by the second pump P2 and the second valve V2 is performed at a rate of, for example, 10 liters per minute (time T3 to T4). In this way, the set amount gradually approaches, and the control device 8 determines whether or not the set amount has been reached (step S10). Then, when the set amount is reached, the second valve V2 is closed and the second pump motor PM2 is turned on.
Set to FF (step S12 and time T4). Then, when the first nozzle 5a is hooked on the fuel dispenser A and the first nozzle switch SW1 is turned off (step S1
3), the control ends.

If it is not preset before 0.5 liter refueling (step S16), normal refueling is performed, refueling is completed, and the first nozzle switch SW1 is turned off.
(Step S14), the first and second valves V1,
V2 is closed and the first and second pump motors PM1 and PM2 are closed.
Is turned off (step S15), and the control ends. In addition, if the first nozzle switch SW1 is turned off by stopping the refueling in the middle of presetting (steps S5, S
8, S11), each valve is closed, and the pump motor is turned off (steps S17, S18, S19), and the control ends. However, the second pump motor PM2 is not turned off when the fuel is being supplied by the second nozzle 5b. Similarly, in the flow of FIG. 4, if the first nozzle 5a is supplying oil, the second pump motor M2 will not be turned off. In this way, for example, a large discharge amount of 180 liters per minute is narrowed down to three stages of 90, 10 liters per minute, and zero, so that a shock due to a change in the discharge amount is almost eliminated.

[0015]

As described above, according to the present invention, the large discharge amount of the first
The discharge amount of the nozzle 5a can be changed in three stages by simple means, and suitable high-speed oil supply can be performed.

Then, when preset lubrication is performed by high-speed lubrication, shock at the time of stoppage can be reduced and equipment such as a pump can be protected.

[Brief description of drawings]

FIG. 1 is a front view showing an apparatus for carrying out the present invention.

FIG. 2 is a control flowchart of high-speed refueling.

FIG. 3 is a discharge amount timing chart of high-speed refueling.

FIG. 4 is a control flowchart of low-speed refueling.

[Explanation of symbols]

 A ... Refueling machine P1 ... 1st pump P2 ... 2nd pump PM1 ... 1st pump motor PM2 ... 2nd pump motor SW1 ... 1st nozzle switch SW2・ ・ ・ Second nozzle switch V1 ・ ・ ・ First valve V2 ・ ・ ・ Second valve V3 ・ ・ ・ Third valve V4 ・ ・ ・ Fourth valve 1 ・ ・ ・ Suction piping 2a, 2b ・..Discharge pipe 2c ... Branching pipe 3a, 3b ... Flowmeter 4a, 4b ... Hose 5a, 5b ... Nozzle 6a, 6b ... Preset key 7a, 7b ... ···Control device

Claims (1)

[Claims] 1. A first pump and a second pump are provided,
A large-diameter first valve and a small-diameter second valve are installed in parallel in the discharge pipe of the second pump, and then connected to the discharge pipe of the first pump, and connected to the oil supply hose via a flow meter. In the preset lubrication method of the connected lubrication device, first, the first and second
Open the valve to drive both the first and second pumps, and stop the first pump before the preset amount by the predetermined amount
The pump is used to refuel, the first valve is closed before another predetermined amount closer to the preset amount than the predetermined value, and the second valve is closed when the preset amount is reached.