JP2888088B2 - Engine oil changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for replacing engine oil of a vehicle, which is installed in a gasoline filling station or the like.

[0002]

2. Description of the Related Art There is an apparatus in which a single apparatus is capable of extracting old engine oil and supplying new oil, and a nozzle is commonly used for extracting and supplying oil. FIG. 2 shows an example of such an engine oil changing device, in which one waste oil tank 3 and three new oil tanks 4, 5, and 6 of different oil types are provided side by side.
A load cell 9 as weighing means is provided at the bottom of the tanks 3 to 6 so that the total weight of the tanks 3, 4, 5, and 6 is added.

As an oil extraction mechanism, a pump 18 is provided in an extraction pipe 16 opening into the waste oil tank 3, connected to an extraction hose 14 via a valve 19, and the tip of the extraction hose 14 is used as a nozzle for the extraction and refueling nozzle 13. Attached to body 17. In the figure
Reference numeral 20 denotes a relief valve provided on the pump 18.

As a new oil supply mechanism, oil supply pipes 21a, 21b, 21c are opened in the respective new oil tanks 4, 5, 6 and the oil supply pipes 21a, 21b are connected to the oil supply pipes 23 via switching valves 22a, 22b. And the oil supply pipe 21c is connected to the oil supply pipe via the switching valve 22b.
23, a forward / reverse pump 24 is provided in the oil supply pipe 23,
Reference numeral 25 denotes a relief valve provided in the forward / reverse rotation pump 24.

The oil supply pipe 23 is connected to an oil supply hose 15 as an oil supply passage via a valve 29, and the tip thereof is connected to the nozzle body 7.

In order to change the oil in the oil pan of the automobile as described above, the extraction and refueling nozzle 13 is inserted into the oil pan, the valve 19 is opened, and the pump 18 is rotated. , Waste oil tank 3
to go into.

When the oil in the oil pan is emptied and air starts to be sucked in from the sampling and refueling nozzle 13, the valve 19 closes and the pump 18 stops.

Next, in order to continue supplying new oil in this state, the valve 29 is opened and the switching valves 22a and 22b are switched to one of the tanks 4, 5, and 6 of the selected oil type, and the oil supply pipe is opened.
An oil supply passage is formed between any one of 21a to 21c, the oil supply pipe 23, the oil supply hose 15, and the extraction and oil supply nozzle 13.
24 rotates forward.

Then, for example, oil pumped from the tank 4 by the pump 24 passes through an empty oil supply pipe 23 and an oil supply hose 15 and is supplied to the oil pan from the extraction and oil supply nozzle 13. When a predetermined amount of oil is supplied, the pump 24 stops and the valve 29 closes.

From this state, the valve 29 is opened and the pump 24 is reversed to return all of the oil in the oil supply pipe 23 and the oil supply hose 15 to the tank 4 in order to prevent the occurrence of oil mixture during the next oil supply.

[0011]

As described above, in the type in which the waste oil extraction hose and the new oil supply hose are connected to a single extraction and oil supply nozzle, the portion of the nozzle body that connects both hoses to the nozzle is used. When both hoses are in communication with each other and new oil is supplied, the air in the hose is extracted from the oil supply hose due to the resistance of the nozzle piping, and the new oil flows around.

As a result, even if the oil supply pump is stopped at the end of the refueling of the new oil, the new oil that has flown to the waste oil sampling hose side is discharged from the tip of the sampling and refueling nozzle by the compressed air, and until the end of the discharging. It takes another 10 to several tens of seconds, and if the withdrawal and refueling nozzle is removed from the oil gauge of the car immediately after the pump stops, the new oil will fall from the nozzle tip and be scattered around.

[0013] Further, the oil supplied after the refueling is mixed with the oil that has flowed to the extraction hose side, but this oil contains waste oil adhering to the inner wall of the extraction hose. The color is dark and gives a bad impression to customers.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to prevent waste oil adhering to the inner wall of the piping from being mixed into the new oil. To provide an engine oil changing device that prevents new oil from flowing around the hose side, prevents new oil from being discharged from the nozzle tip after refueling is completed, and can shorten the working time and enhance the image for customers. It is in.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a drain hose which is provided with a waste oil tank and a plurality of new oil tanks, and is connected to a pipe inserted into the waste oil tank and provided with a pump on the way. And a refueling hose connected to a pipe provided with a switching valve and a forward / reverse rotation pump that is inserted into the new oil tank and switches the flow path to a plurality of new oil tanks on the way, and a nozzle body including the extraction hose and the refueling hose. In an engine oil changing device having a sampling and refueling nozzle connected via a pump, a switching valve for switching between a flow path on the extraction hose side and a flow path on the refueling hose side is provided in the nozzle body, and the extraction and refueling nozzle is always connected. A spring for urging the switching valve so that a flow path is formed between the refueling nozzle and the withdrawal hose, and a check valve for preventing fresh oil outflow between the switching valve and the refueling hose connection portion; Open It is an summarized in that the formation of the.

[0016]

According to the present invention, when the new oil is supplied, the switching valve closes the flow path to the waste oil extraction side pipe, so that the new oil does not flow from the new oil supply side pipe to the waste oil side pipe. . Therefore, if the refueling pump is stopped at the end of refueling, new oil will not be discharged from the nozzle tip even after the refueling is stopped, and the operation can be immediately terminated. In addition, since the pipe for extraction and the pipe for oil supply are formed separately, it is possible not only to prevent the waste oil adhering to the pipe wall at the time of new oil supply from being mixed into the new oil, but also to darken after the end of the oil supply. There is no need to refuel with colored oils and no bad impression on customers.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a nozzle body portion of a sampling and refueling nozzle which is a main part showing an embodiment of an engine oil changing device according to the present invention, and the entire configuration of the engine oil changing device is as already described with reference to FIG. Therefore, detailed description here is omitted.

In the drawing, reference numeral 7 denotes a nozzle main body which constitutes a connection portion between the extraction and refueling nozzle 13 and the extraction hose 14 and the oil supply hose 15, and the extraction and refueling nozzle 13 is connected to one side of the nozzle main body 7. On the other side, the extraction hose 14, the atmosphere opening pipe 34, and the oil supply hose 15 were connected in parallel, and the atmosphere opening pipe 34 was provided with a check valve 30.

Then, the extraction hose 14 is inserted into the nozzle body 7.
The switching valve 1 for switching between the side flow path and the flow path on the oil supply hose 15 side is slidably disposed on the shaft 26. In the figure, reference numeral 27 denotes an O-ring, which prevents oil from being mixed. In the figure, reference numeral 2 denotes a spring. The spring 2 is provided with the switching valve 1 so that a flow path is always formed between the extraction and refueling nozzle 13 and the extraction hose 14.
Is pressed toward the oil supply hose 15 side. Also,
Since the switching valve 1 is urged by the spring 2 in the direction to close the flow path on the new oil side, the new oil does not flow toward the hose 14 during the drainage of the waste oil. Furthermore, since the switching valve 1 closes the flow path to the extraction hose 14 and then connects the oil supply hose 15 to the extraction and oil supply nozzle 13, fresh oil does not flow into the extraction hose 14.

To change the oil in the oil pan of the automobile in this manner, the extraction and refueling nozzle 13 is inserted into the oil pan, the valve 19 is opened, and the pump 18 is rotated. Closes the oil supply hose 15 side, and a extraction flow path is formed between the extraction and oil supply nozzle 13 and the extraction hose 14, so that waste oil is extracted from the extraction hose 14 and the extraction pipe.
Enter waste oil tank 3 via 16.

When the oil in the oil pan is emptied and the air begins to be sucked in from the sampling and refueling nozzle 13, the valve 19 is closed and the pump 18 is stopped.

Next, in order to continuously supply new oil in this state, the valve 29 is opened and the switching valves 22a and 22b are switched to one of the tanks 4, 5, and 6 of the selected oil type, and the oil supply pipe is opened.
An oil supply passage is formed between any one of 21a to 21c, the oil supply pipe 23, the oil supply hose 15, and the extraction and oil supply nozzle 13.
24 rotates forward.

For example, oil pumped from the tank 4 by the pump 24 enters the nozzle body 7 through the empty oil supply pipe 23 and the oil supply hose 15, and is switched by hydraulic pressure against the elasticity of the spring 2. 1 is pushed toward the extraction hose 14 and reaches the extraction and refueling nozzle 13. At this time, after the flow path between the extraction hose 14 and the extraction and refueling nozzle 13 is shut off by the switching valve 1 moved by the hydraulic pressure,
Since a flow path between the nozzle 15 and the sampling and refueling nozzle 13 is formed,
New oil from the oil supply hose 15 does not enter the extraction hose 14 side.

When a predetermined amount of oil is supplied, the pump 24 stops and the valve
29 closes. In this state, the switching valve 1 is moved to the oil supply hose 15 side of the new oil by the pressing force of the spring 2 and the communication between the extraction and oil supply nozzle 13 and the extraction hose 14 is communicated. Does not wrap around, so that even after the pump 24 is stopped, no new oil is continuously discharged from the tip of the nozzle 13 and the discharge is immediately stopped. Therefore, even if the extraction and refueling nozzle 13 is immediately pulled out of the oil pan, the new oil does not droop around. Further, the color of the new oil does not darken after the refueling is completed, and the working time is shortened.

In this state, the valve 29 is opened and the pump 24 is reversed to return the oil in the oil supply pipe 23 and the oil supply hose 15 to the tank 4 in order to prevent the occurrence of oil mixture during the next oil supply. When the oil in the oil supply hose 15 is returned from the oil supply pipe 23 to the tank 4, air is taken into the oil supply hose 15 from the atmosphere open pipe 34 via the check valve 30, and the residual oil in the oil supply hose 15 and the oil supply pipe 23. Surely returns to the tank 4.

[0026]

As described above, the engine oil changing device according to the present invention can prevent the new oil from flowing from the oil supply hose side to the extraction hose side when the new oil is supplied. The new oil can be prevented from being discharged, and the drain pipe and the oil supply pipe are formed separately, so that waste oil adhering to the pipe wall when new oil is supplied can be prevented from mixing into the new oil. That,
The new oil does not darken due to the waste oil mixed in after the refueling is completed, so that the working time can be reduced and the image for the customer can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a nozzle main body, which is a main part of an embodiment of an engine oil changing device for an automobile of the present invention.

FIG. 2 is a piping diagram of an embodiment of an engine oil changing device for an automobile according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Switching valve 2 ... Spring 3 ... Waste oil tank 4, 5, 6 ... New oil tank 7 ... Nozzle body 9 ... Load cell 13 ... Extraction and refueling nozzle 14 ... Extraction hose 15 ... Oil supply hose 16 ... Extraction pipe 17 ... Switching valve 18 ... Pump 19 ... Valve 20 ... Relief valve 21a, 21b. 21c ... oil supply pipe 22a, 22b ... switching valve 23 ... oil supply pipe 24 ... forward and reverse rotation pump 25 ... relief valve 26 ... shaft 27 ... O-ring 29 ... valve 30 ... check valve 34 ... atmosphere open pipe

Claims (1)

(57) [Claims] 1. A sampling hose which is provided with a waste oil tank and a plurality of new oil tanks and is connected to a pipe which is inserted into the waste oil tank and is provided with a pump on the way, and a plurality of new oils which are inserted into the new oil tank and are provided on the way. Engine oil having an oil supply hose connected to a pipe provided with a switching valve for switching a flow path to a tank and a forward / reverse rotation pump, and a sampling and oiling nozzle connected to the sampling hose and the oiling hose via a nozzle body. In the replacement device, a switching valve for switching between a flow path on the extraction hose side and a flow path on the refueling hose side is provided in the nozzle body, and a flow path is always formed between the extraction and refueling nozzle and the extraction hose. A spring for biasing the switching valve so as to form an open-to-atmosphere pipe having a check valve for preventing fresh oil from flowing out between the switching valve and the oil supply hose connection. apparatus.