JP2003312800A - Liquid feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and automatically operate a liquid feeder for feeding a liquid such as a lubricant to a vehicle to be repaired at a vehicle maintenance station or the like by providing a means for knowing a filter clogged status on the intake side of a liquid supply pump and driving the liquid supply pump in a manner free from a fluctuation in a liquid pressure in a main pipe line. <P>SOLUTION: A negative pressure in the main pipe line 2 extending from the filter 4 to the liquid supply pump 3 is monitored by a manometer or a pressure sensor 13 to know the filter 4 clogged status. In addition, a first return pipe line 6 or a second return pipe line 7 each having a relief valve is provided on the main pipe line 2 before and after a check valve 5 provided on the discharging side of the pump 3. Further, a branched pipe line 2a branched from the main pipe line 2 is connected to a high/low pressure setting type pressure switch 12, and a variable resistance valve 10 is provided on the branched line 2a. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply device for safely supplying liquids such as oil and cooling liquid required for a maintenance vehicle to a vehicle in a vehicle maintenance factory.

[0002]

2. Description of the Related Art In a vehicle maintenance factory, there are installed pipes for supplying liquids such as various lubricating oils and engine cooling liquids for supplying to a maintenance vehicle. These pipes are respectively connected via a liquid supply pump. One end of the liquid storage tank is connected and the other end is provided with a liquid supply means such as an oil gun.

When a liquid is started to be supplied to a maintenance vehicle by an oil gun or the like, the liquid supply pump automatically starts its operation to keep the liquid pressure in the liquid supply pipe at a predetermined value. ing.

Further, some vehicle maintenance factories have a waste oil recovery pump for pumping up waste oil from a maintenance vehicle and a waste oil recovery pipe.

On the suction side of these liquid supply pumps, however, a filter for removing dust is generally installed.

[0006]

In the conventional liquid supply device or liquid recovery device in a vehicle maintenance shop or the like, the clogging state of the filter installed on the suction side of the liquid supply pump or the suction side of the liquid recovery device is confirmed. There was no means. For this reason, you should clean these filters regularly,
Alternatively, maintenance such as periodical replacement of the filter element is performed.

However, in the case of such a regular maintenance method, there is a problem in that even if a filter is clogged due to foreign matter, it cannot be detected and an accident may occur.

When the length of the liquid supply pipe is long, a high-frequency pressure fluctuation may occur in the liquid inside the liquid supply pipe when the liquid supply is started or stopped by an oil gun or the like. However, in such a case, there is a problem that the discharge amount of the liquid supply means cannot be adjusted well, and the automatic operation of the liquid supply device cannot be performed safely.

The present invention solves such a problem and provides a liquid supply device capable of detecting the clogging condition of the suction side filter online to prevent an accident and safely perform an automatic operation. With the goal.

[0010]

In order to achieve the above object, the present invention interposes a filter for dust control in the main pipe line on the suction side of a liquid supply pump interposed in the main pipe line for liquid supply and the filter. A pressure gauge or a pressure sensor for detecting a clogging condition of the filter is connected to the main conduit between the liquid supply pump and the liquid supply pump.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention.
Will be described.

FIG. 1 is a system diagram of a liquid supply apparatus to which the present invention is applied in a vehicle garage. 1 is a supply liquid tank, that is, a lubricating oil tank, and 2 is a main pipe line for supplying a lubricating oil which is a supply liquid. A liquid, that is, a lubricating oil supply pump 3 is interposed in an intermediate portion of the main pipeline 2, and a filter 4 is connected to an upstream end of the main pipeline 2 so that the filter 4 is provided in a lower portion of the lubricating oil tank 1. I placed it.

Reference numeral 5 denotes a check valve. The check valve 5 is interposed in the main pipe line 2 on the discharge side of the pump 3, and upstream of the check valve 5 and on the discharge side of the pump 3. A first return pipe 6 extending from the main pipe 2 to the main pipe 2 on the suction side of the pump 3 is provided in communication, and the suction of the pump 3 from the main pipe 2 downstream of the check valve 5 is provided. The second return pipe 7 reaching the main pipe 2 on the side is provided so as to communicate with each other, and the first return pipe 6 is provided with a first relief valve 8 and the second return pipe 7 is provided with a second relief valve 9 respectively. Intervened.

Further, the branch pipe 2a is branched from the downstream side of the branch portion of the second return pipe 7 of the main pipe 2, and the opening of the valve is adjusted to the middle portion of the branch pipe 2a to control the flow resistance. A variable resistance valve 10 capable of adjusting the pressure is interposed, and a pressure gauge 11 and a pressure switch 1 are provided on the branch pipe 2a on the tip side of the variable resistance valve 10.
2 connected. Here, the pressure switch 12 is formed so that desired high pressure and low pressure can be set.

Reference numeral 13 denotes a pressure gauge or pressure sensor, and the pressure gauge or pressure sensor 13 is the second return line 7
Is connected to a branch pipe 2b branched from the main pipe 2 on the upstream side of the branch portion.

Reference numeral 14 is a terminal portion of the main conduit 2 to which an oil gun or the like is connected.

Reference numeral 15 denotes an electric motor of the pump 3.

Next, the function and operation of the liquid supply apparatus of this embodiment will be described.

In the vehicle maintenance shop in which this device is installed, the lubricating oil supply pump 3 can be automatically operated by the electric motor 15.

That is, the pressure in the main pipe line 2 for supplying the lubricating oil to the oil gun or the like is always detected by the high / low pressure setting type pressure switch 12, and if the pressure drops to the lower limit set pressure, the electric motor 15 The switch is automatically turned on to start driving the lubricating oil supply pump 3. When the pressure rises to the upper limit set pressure, the electric motor 15 is switched off and the supply of lubricating oil to the main pipeline 2 is stopped.

Here, since the variable resistance valve 10 is interposed in the branch pipe line 2a reaching the pressure switch 12, at the branch point 2c of the branch pipe line 2a, the high-frequency pressure fluctuation of the lubricating oil in the main pipe line 2 is caused. Even if occurs, the average pressure obtained by cutting the high frequency component can be transmitted to the pressure switch 12. As a result, the electric motor 15 that drives the lubricating oil supply pump 3 does not repeatedly turn on and off,
The lubricating oil supply device can be automatically operated safely.

The variable resistance valve 10 is set at a throttle resistance exactly suitable for eliminating the high frequency pressure fluctuation.

Check valve 5 interposed in the main pipe line 2
Is generally used to prevent backflow of the lubricating oil on the downstream side of the check valve 5 and to stabilize the discharge from the lubricating oil supply pump 3. In the present invention, the first return pipe 6 having the first relief valve 8 before and after the check valve 5 or the second return pipe 7 having the second relief valve 9 respectively.
Since the lubricating oil that has flowed excessively into the main pipeline 2 is released by the provision of the above, the effect of the check valve 5 is further improved, and an oil gun (not shown) connected to the terminal portion 14 of the main pipeline 2 is provided. Therefore, it has become possible to constantly discharge a stable amount of lubricating oil.

Further, the pressure gauge 13 connected to the main pipe line 2 on the suction side of the lubricating oil supply pump 3 functions as a monitor for judging the clogging condition of the filter 4.

That is, when the negative pressure of the pressure gauge 13 falls below a predetermined value, it is determined that the filter 4 is clogged, and the filter 4 is cleaned or replaced.

Further, a pressure sensor may be used instead of the pressure gauge 13, and when the negative pressure becomes a predetermined value or less, an alarm is automatically issued to notify the clogging of the filter 4. Good.

In the above embodiment, an example of the lubricating oil supply device for supplying the lubricating oil to the maintenance vehicle is shown. This is an engine cooling supply device for supplying the engine cooling liquid instead of the lubricating oil. May be

In the above embodiment, one end of the first and second return pipes 6 and 7 is connected to the main pipe 3 on the suction side of the pump 3 in a branched manner. One ends of the pipe lines 6 and 7 may be opened in the supply liquid tank 1.

A second embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a system diagram of a liquid supply apparatus to which the present invention is applied in a vehicle maintenance shop. 1 is a supply liquid tank, that is, a lubricating oil tank, 22 is a main line for supplying liquid, that is, lubricating oil, A liquid, that is, a lubricating oil supply pump 23 is interposed in an intermediate portion of the passage 22, and a filter 4 is connected to an upstream end of the main pipe passage 22 so that the filter 4 is arranged in a lower portion of the lubricating oil tank 1. ing.

Reference numerals 25a and 25b denote check valves, of which the check valve 25a is interposed in the main line 22 on the suction side of the pump 23, and the other check valve 25b is the pump 23. Is interposed in the main conduit 22 on the discharge side.

The main pipe line 2 on the downstream side of the check valve 25b.
Second return pipe 26 from 2 to the lubricating oil tank 1
And a relief valve 27 is interposed in the third return conduit 26.

The lubricating oil supply pump 23 is composed of, for example, a tire flam which is driven to expand and contract by the air from the air pipe 23a.

Then, the operation of the pump 23 is continued until the lubricating oil pressure on the discharge side of the lubricating oil supply pump 23 is balanced with the air pressure of the air pipe 23a, and when both pressures are balanced, the pump 23 Is controlled to stop the operation of.

Next, the operation and advantages of this embodiment will be described.

In this embodiment, the lubricating oil supply pump 23
The pressure in the main pipe line 22 on the discharge side of the air pipe 23a
Since it is controlled by the air pressure, the pressure sensor 1 for setting the high and low pressure in the first embodiment.
2 is unnecessary and has an advantage that the device is simple.

Further, in the present embodiment, the lubricating oil supply pump 2
A check valve 25a was also provided on the suction side of No. 3, but this prevents the lubricating oil from being supplied to the main pipe line 22 between the check valve 25a and the lubricating oil supply pump 23 when the lubricating oil supply pump 23 is stopped. Since it operates so as to be confined, it has the effect of preventing air from entering the suction side of the lubricating oil supply pump 23.

This is particularly effective when air is used to drive the lubricating oil supply pump 23.

Further, as in the case of the first embodiment, in the present embodiment as well, the clogging condition of the filter 2 can be detected by the 13 pressure gauges or pressure sensors and appropriate treatment can be performed. So be safe.

In the present embodiment, the tip of the third return pipe 26 is arranged to reach the inside of the lubricating oil tank 1. However, the tip of the third return pipe 26 is connected to the check valve 25a. It may be connected to the main conduit 22 on the upstream side.

A third embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a system diagram of a liquid supply apparatus for collecting the waste oil discharged from the maintenance vehicle to the waste oil recovery tank 31 in a large-sized waste oil storage tank 32 installed separately in a vehicle maintenance factory.

That is, reference numeral 33 denotes a main pipe for discharging waste oil which is a liquid to be supplied. A waste oil discharge pump 35 is provided at an intermediate portion of the main pipe 33 and a filter 34 is provided at an upstream end of the main pipe 33. After connection, the filter 34 was placed in the lower portion of the waste oil recovery tank 31.

The downstream end of the main conduit 33 is opened in the waste oil storage tank 32.

Reference numeral 36 is an electric motor for driving the waste oil discharge pump 35, and the electric motor 36 is a timer 3
The drive control is performed by 8.

Reference numeral 37 denotes a pressure gauge or pressure sensor, which is connected to a branch pipe 37a branched from the main pipe 33 between the filter 34 and the waste oil discharge pump 35. .

Next, the function of this embodiment will be described.

When replacing the lubricating oil of the maintenance vehicle, the old lubricating oil is discharged to the waste oil recovery tank 31. The released lubricating oil, that is, the waste oil, is collected by the waste oil discharge pump 35 from the waste oil storage tank
Collected in 2. Here, the pump 35 is an electric motor 36 which is driven and controlled for a time set by a timer 38.
Is operated by.

When the filter 34 is clogged during operation of the waste oil discharge pump 35, this can be detected by the pressure gauge or the pressure sensor 37 to prevent the electric motor 36 from overloading.

[0050]

As described above, according to the present invention, it is possible to detect the clogging condition of the dust control filter disposed on the suction side of the liquid supply pump and take preventive measures.
There is an effect that the liquid supply pump can be driven so as not to be influenced by the pressure fluctuation generated in the main pipe, and the automatic operation of the liquid supply device can be safely performed.

[Brief description of drawings]

FIG. 1 is a system diagram of a liquid supply apparatus according to a first embodiment of this invention.

FIG. 2 is a system diagram of a liquid supply apparatus according to a second embodiment of the present invention.

FIG. 3 is a system diagram of a liquid supply apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

2, 22, 23 Main pipeline 3,23,35 Liquid supply pump 4,34 filter 5, 25a, 25b Check valve 6 First return line 7 Second return line 8, 9, 27 relief valve 10 Variable resistance valve 11, 13, 37 Pressure gauge (pressure sensor) 12 Pressure switch 26 Third Return Line

Claims (8)

[Claims] 1. A filter for dust control is interposed in the main line on the suction side of a liquid supply pump interposed in the main line for liquid supply, and the main line between the filter and the liquid supply pump is A liquid supply device connected to a pressure gauge or pressure sensor that detects the condition of filter clogging. 2. A branch pipe is branched from the main pipe on the discharge side of the liquid supply pump interposed in the main pipe for liquid supply, and the branch pipe is provided with a pressure switch operated by the pressure of the liquid in the branch pipe. A liquid supply device in which a variable resistance valve is interposed in the branch pipe between the pressure switch and the main pipe line. 3. A liquid supply pump is provided with a check valve for preventing backflow interposed in the main conduit on the discharge side of the liquid supply pump, and branched from the main conduit on the upstream side and the downstream side of the check valve. A first return line and a second return line returning to the main pipe or the supply liquid tank on the suction side of the pump,
The liquid supply apparatus according to claim 1 or 2, wherein relief valves are respectively provided in the first return pipe and the second return pipe. 4. The structure is such that the liquid supply pump is driven by air, and the liquid supply pump is continuously driven until the discharge side pressure of the liquid supply pump rises and balances with the supply pressure of the air. 3. The liquid supply device according to claim 1 or 2. 5. A check valve is provided in each of the main pipelines on the suction side and the discharge side of the liquid supply pump, and the liquid is fed from the main pipeline downstream of the check valve on the discharge side of the liquid supply pump. 5. The liquid supply according to claim 4, wherein a third return pipe returning to the main pipe or the supply liquid tank upstream of the check valve on the suction side of the supply pump is provided, and a relief valve is interposed in the third return pipe. apparatus. 6. A liquid supply device which is formed so as to recover waste liquid from a waste liquid tank by a waste liquid recovery electric pump interposed in a waste liquid recovery main pipe, and the waste liquid recovery electric pump is operated by a timer. 7. The liquid supply apparatus according to claim 6, wherein a filter is connected to the waste liquid recovery main pipe on the suction side of the waste liquid recovery electric pump. 8. A filter for dust control is provided in the main pipe line on the suction side of the electric pump for collecting the waste liquid from the waste liquid tank by a waste liquid collecting electric pump interposed in the waste liquid collecting main pipe line, and the filter and the filter are provided. A liquid supply apparatus in which a pressure gauge or a pressure sensor for detecting a clogging condition of the filter is connected to the main pipe line between the electric pump and the electric pump.