JPS6085272A - Pump device - Google Patents

Abstract

PURPOSE:To decrease the size of a gas-liquid separator chamber so as to enable the whole pump device, used for a fuel oil supply device, to be formed in a small size, by providing the separator chamber which separates gas from liquid by centrifugal force turning the delivered liquid to the delivery port side of a pump. CONSTITUTION:Delivered liquid from a liquid path 18 communicated to the delivery port of a pump is allowed to flow into an outer cylinder 20 from the tangential direction and return to a strainer chamber 5 through a check valve, by allowing gas collected in the center to flow into a gas-liquid separator chamber 8 through an inner cylinder 21 by the centrifugal action, further by separating the gas from the liquid by the gravitational action. Then the liquid turning in an outside in the outer cylinder 20 is allowed to flow into the strainer chamber 5 passing a delivery valve and supplied to the outside through a liquid path 11 connected to a suction side of the pump through a bypass valve 43. In this way, the separator chamber is required to be enlarged when it operates only the gravitational action, but a device can be formed into a small size by concurrently using the separator chamber operating the centrifugal action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump device implemented, for example, at a refueling station in a gas station.

As is well known, in a refueling system at a refueling station that handles volatile liquids such as gasoline, a pump device is provided with a device that separates gases mixed in the liquid as bubbles. In the prior art, the gas-liquid separation device has a large filter chamber, reduces the flow rate, floats gas, that is, liquid containing bubbles upward, and causes the liquid to flow into the gas-liquid valve 11111 chamber. Then, in the gas-liquid separation chamber, gas and liquid are separated. In such conventional technology, the natural floating of air bubbles is used in order to enhance the gas-liquid separation effect in the gas-liquid separation device, so the filter chamber must be made large to reduce the flow velocity. The whole thing becomes larger.

Furthermore, since the air bubbles are naturally floated, it is difficult for the air bubbles to be completely separated from the liquid, and the liquid mixed with air bubbles is flowed out from the discharge side of the pump device. In order to completely separate air bubbles, the filter chamber must be made larger or the flow m into the gas-liquid separation chamber must be increased, which increases the size of the pump and reduces its efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a gas-liquid separation device that is small in size and has a high gas-liquid separation efficiency. According to the present invention, the gas-liquid separator separates gas and liquid while swirling the inflowing liquid.

Therefore, the liquid flowing in from the inlet rotates, and because the liquid has a heavy specific gravity, it flows radially outward due to centrifugal force.
Since air bubbles have a low specific gravity, they collect in the center in the radial direction, and the liquid containing the air bubbles collected in the center can be separated and flowed into the gas-liquid separation chamber. Therefore, the air can be easily and efficiently removed. Liquid separation can be performed.

In the present invention, gas and liquid are forcibly separated by vortex flow, so gas and liquid can be separated reliably even with a small size, and the flow rate flowing from the gas-liquid separation III device to the gas-liquid separation chamber is also small, which improves pump efficiency. improves.

When implementing the present invention, the faster the swirling flow, the better the gas-liquid separation ability will be. Therefore, when installing in a limited space such as a fuel supply system, it is extremely important to be able to downsize the system.

The present invention will be described in detail below with reference to the drawings.

1 to 4 show the entirety of a pump device U embodying the present invention, and this pump device U is equipped with a casing C. As shown in FIG. The casing C is provided with a liquid inlet 1 and an outlet 0. A check valve 1 is provided at the inner end of the inlet I, and a strainer 2a is provided on the inlet side, which opens into the chamber 2. As shown in the diagram, check valve 1
The valve is of the type that closes by gravity, and a stopper 50 is provided above the valve to prevent the valve from coming off during transportation or operation of the pump device. A pump 3 is installed approximately in the center of the non-nocing C. In the illustrated embodiment, the pump 3 is a known internal gear pump. This pump 3 has a suction port 3a and a discharge port 3b, and a liquid path 10 is formed in the casing C to connect the chamber 2 and the suction port 3a.

The discharge of the pump 3 [13b is the gas-liquid separation device 4, which will be described later.
is connected to. A wave path is configured so that the liquid flowing radially outward of this gas-liquid 1 ml device 4, that is, the liquid containing or not containing bubbles, flows into a strainer 5a on the outflow side. Strainer chamber 5 and outlet 0
A control valve 6 is provided between the control valve 1 and the control valve 6. This con!・When the pump is running, the 1 call valve 6 resists the spring 6a and the liquid flows out, and after the refueling is stopped, the liquid flows out due to a rise in temperature, etc., and the pressure in the pipe connected to 1 becomes high. At times, the small valve 6C is opened against the splash 6b to allow the liquid to flow backwards. A bypass valve 12 is installed in a liquid path 11 for liquid flowing radially outward of the gas-liquid separation device 4,
This liquid path 11 communicates with the suction port 3a of the pump 3.

On the other hand, the liquid containing bubbles flowing inside the gas-liquid separator 4 in the radial direction passes through the flow rate restriction valve 7 and flows into the liquid path 13. This liquid path 13 is formed in the cover 16. This liquid path 13 communicates with a gas-liquid separation chamber 8, which will be described later. The gas separated in the gas-liquid separation chamber 8 is discharged from the air vent 14, and the liquid from which the gas has been separated flows into the liquid path 15. This liquid passage 15 is provided with a check valve 9, and this liquid passage 15 is connected to the strainer chamber 2 on the inflow side.
is connected to.

A cover 16 is provided on a pair of surfaces of the casing C that cover each other. This is to allow only one pair of surfaces to be opened for repairs after installation.

Therefore, when the pulley 17 is partially rotated to rotate the pump 3, the liquid flows from the inlet I to the check valve 1, the strainer chamber 2 on the inflow side, the pump 3, the gas-liquid separator 4, and the outflow side. It passes through the strainer chamber 5 and the control valve 6 and is discharged from the outlet O. Further, a part of the liquid from the gas-liquid separator 4 passes through the bypass valve 12 and is bypassed to the pump 3. This is the discharge liquid depending on the rotation speed of the gear pump 3■
This is to accommodate changes in the ejection amount since the amount is fixed. On the other hand, in the gas-liquid separator 4, the liquid containing gas flows through the flow rate restriction valve 7 to the gas-liquid separation chamber 8, where the gas is released from the air vent 14, and the liquid passes through the check valve 9 to the strainer on the inflow side. He is returned to room 2.

Next, a gas-liquid separation device for a pump device embodying the present invention will be explained.

As shown in FIG. 4, a wave path 18 from the pump discharge port 3b leading to the gas-liquid component 11 [device 4] communicates with a volute chamber S configured to guide the gas-liquid component tangentially to the device 4. (See Figure 9). In FIGS. 5 and 9, this spiral chamber SG and L are extended by the outer fil 20,
The end portion 20a is open and communicates with the strainer chamber 5 and the flow path 11 on the outflow side.

Therefore, the gas-free liquid flowing out from the end 20a of the outer cylinder 20 flows into the strainer 5 from the outside to the inside.
Flows into the chamber 23 formed at the axial end of the strainer 5,
The water flows through the control valve 6 and flows out from the outlet O.

On the other hand, inside the inner cylinder 21 of the gas-liquid separator 4, a valve body 24 and a valve seat 25 constituting the flow rate limiting valve 7 are provided, and the valve body 24 is pressed by a spring 26 in the -C opening direction. This valve body 24 has a frontage 22 in the center and an opening 27 in the side. When the amount of gas contained in the liquid increases, the pressure on the inlet side of the valve body 24 decreases, and when there is little gas, the pressure on the inlet side of the valve body 24 decreases.
The pressure on the input L1 side of 4 is high! , do. Therefore, when the amount of air contained in the liquid increases, the valve body 24 moves to the left in the drawing due to the pressure difference between the front and rear, and a large amount of liquid (including air bubbles) passes through the passage 28 of the valve seat 25 from the opening 22.27. liquid path
It flows to 13th. As the amount of air bubbles decreases, the valve body 24 moves to the right due to the pressure of the inflowing liquid, and the liquid flows out from the central opening 22. The flow rate is therefore controlled. As shown in FIG. 5a, if a spiral convex portion 20X is provided on the inner wall of the outer cylinder 20 to generate a swirling flow, a stronger swirl will be generated. 111 efficiency will increase.

6 and 7 show a gas-liquid separation chamber 8 implemented in the present invention.
A preferred embodiment is shown.

The gas-liquid separation chamber 8 has an outlet [IIL30
A shelf 31 is provided at a position facing the liquid path 13 to reduce the inflow force of the liquid containing bubbles flowing out from the liquid path 13. Therefore, the liquid flowing out from the outlet hole 30 flows into the shelf section 31 and flows downward along the wall surface. For this purpose, the gas-liquid separation chamber 8
There is no foaming inside the air vent pipe 14, which prevents malfunction of the float due to foaming, and also prevents liquid from flowing out from the air vent pipe 14. A float 32 that can rotate about a pivot point 333 is provided in the gas-liquid separation chamber B.

Therefore, when liquid accumulates in the gas-liquid separation chamber 8, )C1-3
2 rotates in the opposite direction δ1 about the pivot point 33, and the valve body 34 opens, so that the liquid in the gas-liquid portion l1lIl chamber B flows through the liquid path 1.
5. Note that 35 in the figure is a stopper.

As shown in FIG. 8, a reverse valve 9 is provided in the liquid path 15 from the gas-liquid portion 111 chamber E3. The liquid passage 15 communicates with the strainer chamber 2 on the inflow side via the check valve 9. Therefore, the liquid in the chamber 2 will not flow back into the gas-liquid separation chamber 8 when the pump is stopped.

FIG. 9 shows a preferred embodiment of bypass valve 12 implemented in the present invention.

That is, the outer cylinder 20 and the inner cylinder 21 of the gas-liquid component 1III1
The bubble-free liquid flowing out from the passage between the two flows on the one hand towards the strainer chamber 5 on the outflow side, and the excess liquid flows through the liquid passage 11 towards the bypass valve 12.

The bypass valve 12 includes a valve body 40 pressed by a spring 42 and a valve seat 41 on which the valve body 40 is seated. Therefore, when the pressure in the liquid path 11 on the upstream side of the valve body 40 increases, the valve body 40 opens against the spring 42, and the liquid flows into the chamber 44 on the downstream side of the valve body 40. This chamber 44 communicates with the suction port 3a of the pump 3. The spring seat 45 that locks one end of the spring 42 can be positioned by an adjustment screw 46.
This allows the valve body 40 to adjust the hydraulic pressure.

As described above, according to the present invention, a gas-liquid separator of the type that separates gas contained in the liquid while flowing from the inlet to the outlet while swirling the liquid flowing from the inlet to the outlet is provided. The liquid becomes a swirling flow and the bubbles gather in the center, which can promote the gas-liquid separation effect. Therefore, the entire device can be miniaturized, which is highly effective in the pump device of this scale.

[Brief explanation of the drawing]

FIG. 1 is a front view of a pump device embodying the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a plan view thereof, FIG. 5a is a sectional view showing another embodiment of the gas-liquid separation device, FIG. 6 is a vertical sectional view showing the gas-liquid separation chamber, and FIG. 7 is a sectional view showing the gas-liquid separation chamber. FIG. 8 is a cross-sectional view showing the separation chamber, FIG. 8 is a cross-sectional view showing the check valve, and FIG. 9 is a cross-sectional view showing the bypass valve. 1...Check valve 2...Strainer on the inflow side 3
... Pump 4 ... Gas-liquid #1 device 5 ... Strainer on the outflow side 6 ... Control valve 7 ... Flow rate restriction valve 8 ... Gas-liquid separation chamber 9 ... Check valve 12
...Bypass valve S...Volume chamber 2o...Outer cylinder
21...Inner cylinder

Claims (1)

[Claims] A pump device equipped with a gas-liquid separator that swirls liquid and separates gas and liquid on the pump discharge side.