JPH04327197A - Pump unit - Google Patents

Abstract

PURPOSE:To prevent leakage due to overpressure from injuries of a hose or a sealing part and to simplify piping by a method wherein a discharge part of a pump is branched into a plurality of passages, and the branched passages are connected with a flow meter respectively through an on/off valve. CONSTITUTION:A discharge part of a pump 3 is branched into a plurality of passages, and the branched passages are connected with a flow meter 5a and 5b respectively through a solenoid valve 25a and 25b as an on/off valve. By this constitution, a controller 10, when nozzles 8a and 8b are put off from an oil feeder 1 and nozzle switches 9a and 9b close, closes the solenoid valves 25a and 25b. Accordingly, for example, when oil feeding is made through the nozzle 8a, not through the nozzle 8b, the solenoid valve 25a is opened while the solenoid valve 25b is closed. As a result, during the oil feeding through the nozzle 8a, even if the oil feeding is stopped suddenly and a high oil pressure occurs inside the branch, it can be prevented without fail that the high oil pressure effects on a hose 7b by the closed solenoid valve 25b through the branched passage.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a pump unit for a refueling device installed at a refueling station such as a gas station.
In particular, the present invention relates to a pump unit in which one pump is provided with a plurality of (for example, two) flowmeters.

0002

[Prior Art] Such a pump unit is
No. 360. In this unit, a check valve is provided in each branch of the internal passage formed in the lid member, and this prevents the flow paths leading to each nozzle from interfering with each other, and also prevents one nozzle from opening and the other nozzle from interfering with each other. Even when the flowmeter is closed, this ensures that the flowmeter on the other side does not rotate in the opposite direction due to differential pressure, etc., causing detection errors.

0003

[Problem to be Solved by the Invention] In the above-mentioned known pump unit, when one side is refueling and the other is not refueling, if refueling is abruptly stopped (sudden stop of auto nozzle, etc.), high oil pressure causes refueling to fail. The check valve on the other side opens,
Oil flows and becomes high pressure. The open check valve then closes, maintaining high pressure inside the hose, and as a result, the hose swells, making it susceptible to damage and causing leaks due to pressure exceeding a specified value acting on the seal. There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pump unit in which a plurality of flow meters are provided in one pump, which prevents damage to the hose and leakage from the seal portion.

[0005]

According to the present invention, the discharge portion of the pump is branched into a plurality of passages, and a flow meter is connected to each of the branched passages via an on-off valve.

[0006] It is preferable that the on-off valve is configured to close a branched passage from the flowmeter side using a solenoid valve or an air valve, and each is connected to a control device.

Preferably, the control device controls the on-off valve to close based on a signal from a nozzle switch that detects that the refueling nozzle is removed from the refueling machine.

[0008]

[Operation] In the pump unit configured as described above, the control device closes the on-off valve on the side where oil is not supplied. Therefore, even if high oil pressure is generated by abruptly stopping refueling on the oil supply side, the closed on-off valve reliably prevents the high oil pressure from acting on the hose on the side that is not being refueled. As a result, leakage from the bulges and seals of the hose is prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, a fuel dispenser 1 is provided with a pump 3 driven by a motor 2, and this pump 3 is connected to an oil storage tank (not shown) through a suction pipe 4. A pump cover 20, which together with the motor 2 and pump 3 constitutes a pump unit, is fixed on the top of the pump 3. A plurality of (two in the illustrated example) flowmeters 5a, 5b are fixedly mounted on the upper part of the pump cover 20, and hoses 7a, 7b are attached to the flowmeters 5a, 5b, respectively.
Refueling nozzles 8a and 8b are connected via.

The refueling machine 1 also includes a nozzle switch 9a that detects when the nozzles 8a and 8b are removed from the refueling machine 1.
, 9b are provided, each connected to the control device 10,
The control device 10 is connected to flow rate pulse transmitters 6a, 6b of the flowmeters 5a, 5b, indicators 11a, 11b, and electromagnetic valves 25a, 25b to be described later.

In FIG. 2, the pump cover 20 is provided with an inlet 21 communicating with the discharge port 3a of the pump 3 on one side, and a branch portion 22 that branches horizontally opposite to each other on the other side. The suction ports a of the flowmeters 5a and 5b communicate with the openings 23a and 23b on both sides and are oriented outwardly and upwardly, respectively.
Branch passages 24a and 24b communicating with b are formed. The communication portion between the branch portion 22 and the branch passages 24a, 24b includes an opening 23a from the side of the branch passages 24a, 24b.
, 23b are provided, and these solenoid valves 25a, 25b are connected to the control device 10, respectively.

With this configuration, the control device 10 removes the nozzles 8a and 8b from the fueling machine 1 and switches the nozzle switch 9 on.
When a and 9b are closed, solenoid valves 25a and 25b are closed. Therefore, for example, when refueling is performed through the nozzle 8a and not refueled through the nozzle 8b, the solenoid valve 25a opens and the solenoid valve 25b
is closed. Therefore, while refueling with nozzle 8a,
Even if the oil supply suddenly stops and the oil pressure inside the branch 22 becomes high,
The closed electromagnetic valve 25b reliably prevents high hydraulic pressure from acting on the hose 7b via the branch passage 24b. In this embodiment, the branch passage and the solenoid valve are provided in the pump cover, but they may also be provided in the case of the pump and the flow meter directly connected to the pump.

[0014]

[Effects of the Invention] Since the present invention is constructed as described above, even if the on-off valve on the non-lubricating side is closed and refueling is abruptly stopped, high oil pressure can be ensured to act on the hose on the non-lubricating side. can be prevented.

[0015] Therefore, damage to the hose can be prevented, and leakage due to overpressure from the seal portion can also be prevented.

The on-off valve can also be used as a preset valve to simplify piping.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a refueling machine equipped with a pump unit embodying the present invention.

FIG. 2 is a front cross-sectional view of essential parts showing an embodiment of the present invention.

[Explanation of symbols]

1... Refueling machine 2...Motor 3...Pump 3a...Discharge port 4...Suction piping 5a, 5b...flow meter 6a, 6b...Flow rate pulse transmitter 7a, 7b... hose 8a, 8b...Refueling nozzle 9a, 9b... nozzle switch 10...control device 11a, 11b...indicator 20...Pump cover 21...Inlet 22... Branch 23a, 23b opening 24a, 24b...branch passage 25a, 25b...Solenoid valve

Claims (1)

[Claims] 1. A pump unit characterized in that a discharge portion of the pump is branched into a plurality of passages, and a flow meter is connected to each of the plurality of branched passages via an on-off valve.