JP4531728B2 - Fuel oil pump unit drainage structure - Google Patents

Description

  The present invention relates to an oil discharge structure of a fuel oil pump unit.

For example, in a gas station such as a gas station, fuel oil is supplied from an underground tank to a vehicle or the like through a measuring unit using a pump unit built in the measuring unit. (See Patent Document 1).
Japanese Patent No. 3512287 (left column of page 3, FIG. 6)

  In Patent Document 1, a primary filter is provided at the fuel oil inlet of the pump unit, and the fuel oil is filtered before being introduced into the pump. The filtered fuel oil is introduced into the separation device by the pump.

  As is well known, the fuel oil may be in a state where gas such as gas or air vaporized in the transport process is mixed as bubbles. The separation device separates the fuel oil into a gas liquid and a liquid containing a gas, and the liquid is introduced into the outlet of the casing of the pump unit.

  On the other hand, the gas liquid is introduced into a separation chamber and stored, whereby the gas liquid is separated into a liquid and a gas. The separated liquid is sucked into the pump of the pump unit. On the other hand, the separated gas is discharged from the air vent into the atmosphere.

  In the pump unit of Patent Document 1, in order to prevent an increase in the liquid level of the liquid in the separation chamber even if the pump is stopped, the lower end of the gas-liquid passage through which the gas liquid passes is the liquid in the separation chamber. It is provided to immerse inside.

  Here, as disclosed in Patent Document 1, it is preferable to provide a secondary filter and filter the liquid separated by the separation device again.

However, since the gas other than the gas in the separation chamber is not in communication with the atmosphere, even if the pump is stopped, the secondary filter chamber containing the secondary filter is filled with the liquid.
Therefore, when the secondary filter chamber is opened in this state, fuel oil (liquid) such as gasoline flows out from the opening of the secondary filter chamber. Here, since the fuel oil such as gasoline has a low viscosity, it suddenly flows out of the filter chamber, so that it easily spills, and at this time, a problem such as contamination of the surrounding ground and the clothes of the operator is likely to occur.

  Accordingly, an object of the present invention is to easily transfer the fuel oil flowing out from the filter chamber containing the filter to another container when replacing the filter that filters the liquid received from the separation device and guides it to the outlet of the casing. It is to provide an oil discharge structure of a fuel oil pump unit.

  In order to achieve the main object, the fuel oil pump unit oil discharge structure of the present invention comprises a separation device that swirls fuel oil discharged from a pump and separates it into gas-liquid and liquid containing gas; In a fuel oil pump unit in which a separation chamber for separating gas from the gas liquid separated by the separation device and a pump are provided in the casing, the liquid received from the separation device is filtered and the casing A filter that leads to the outlet, a filter chamber that houses the filter, a filter lid that is fastened to the casing with a fastener and allows the filter to be removed from the filter chamber, and covers a lower portion of the filter lid And a ridge formed of a ridge formed in a substantially U shape or a substantially concave shape.

  According to the present invention, since the substantially U-shaped or substantially concave-shaped ridges are provided so as to cover the filter lid from below, even if the filter chamber is filled with fuel oil when the filter is replaced, the ridges By pre-applying the fuel oil, it is possible to extract the fuel oil into an oil receiving can or the like without spilling the fuel oil. Therefore, the filter can be replaced without polluting the surrounding ground and the worker's clothing with the fuel oil.

In the present invention, it is preferable that the flange is formed in the substantially U shape or the substantially concave shape by connecting a side plate portion covering the side of the filter lid and a bottom plate portion covering the lower end of the filter lid. .
According to this aspect, since the soot is formed in a substantially U shape or a substantially concave shape in which the side plate portion and the bottom plate portion are continuous, fuel oil such as low-viscosity gasoline suddenly flows out of the filter chamber. Even so, it is difficult for the fuel oil to overflow outside the soot, and the risk of spilling the fuel oil is further reduced.

In the present invention, it is preferable that the bottom plate portion of the ridge is inclined obliquely downward toward the outside.
According to such an aspect, the fuel oil is discharged through the bottom plate portion inclined obliquely downward, so that the fuel oil can flow more smoothly into the soot and the oil receiver.

In this invention, it is preferable to further provide the protrusion part which can hold | maintain on both sides of the upper end of a collar member between the said baseplate part inclined diagonally downward.
According to this aspect, since the eaves member can be sandwiched between the bottom plate portion and the protruding portion, the omission of the eaves member can be prevented and the fuel oil can be discharged smoothly.

In the present invention, a through hole that is closed by the filter lid, and a lid portion that closes one end of the separation device in a state that allows the liquid from the separation device to be introduced into the filter chamber; It is preferable that the flange lid further includes a flange lid, and the flange is formed on the flange lid.
According to such an aspect, since the flange is provided not on the casing of the pump unit but on the small flange lid, even if the flange is molded into a thin wall, “shrinkage” hardly occurs. Therefore, there is no possibility that the yield of the casing will decrease.
Further, when replacing the filter, it is convenient because the fuel oil can be extracted and the filter can be replaced by simply opening the small flange cover without removing the entire flange cover.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Lubrication system:
First, an example of an oil supply system in which the present pump unit is used will be described.

As shown in FIG. 1, the oil supply system includes an underground tank 1, a pipe 2, a pump unit 3, a solenoid valve 4, a flow meter 5, a hose 6, and a nozzle 7.
When the nozzle 7 is inserted into the fueling port of the vehicle and fueling is started, the fuel oil F is pumped up from the underground tank 1 embedded in the fueling station via the pipe 2 by the pump unit 3 and discharged from the nozzle 7.

  As described above, since gas such as vaporized gas or air may be mixed in the fuel oil F, the gas mixed in the fuel oil F is removed by the pump unit 3, and the gas is removed. Only the liquid L passes through the solenoid valve 4, the flow meter 5, the hose 6, and the nozzle 7 and is supplied to the vehicle.

Pump unit 3:
Next, a schematic configuration of the pump unit 3 will be described.
Flow of fuel oil F and liquid L;
The pump unit 3 includes a rotary pump 20. When the pump 20 is activated, the fuel oil F supplied from the underground tank 1 through the pipe 2 to the pump unit 3 is sent from the inlet 10 of the pump unit 3 to the primary filter 11 (see FIG. 2A).

  The fuel oil F passes through the first check valve 12 from the primary filter 11, is sucked into the pump 20 from the suction side 20a of the pump 20, and is discharged from the discharge side 20b of the pump 20 to the separation device 31 (see FIG. 2B). ).

  The separation device 31 swirls the fuel oil F discharged from the discharge side 20b of the pump 20 and separates it into gas liquid FA and liquid L, which are liquids containing gas A (see FIG. 3A).

The separator 31 shown in FIG. 3A swirls the fuel oil F fed from the pump 20 in the separator 31 and collects the liquid L outward in the radius and the gas liquid FA in the radius due to the difference in centrifugal force. Gather toward you. Thereby, the liquid L and the gas liquid FA are separated (see, for example, Japanese Patent Publication No. 4-15399).
The liquid L separated by the swirling is sent to the secondary filter 32 in FIG. On the other hand, the gas liquid FA is led out to the gas liquid passage 35.

  The liquid L separated from the fuel oil F passes through the secondary filter 32, passes through the second check valve 33, and is supplied from the outlet 34 to the hose 6 through the electromagnetic valve 4 and the flow meter 5 (FIG. 3B). And FIG. 4).

Flow of gas-liquid FA;
The gas-liquid FA led out to the gas-liquid passage 35 is sent to the separation chamber 40. The separation chamber 40 stores the gas liquid FA. As a result, the liquid L accumulates in the lower liquid phase portion 40a and is separated into the liquid L in the liquid phase portion 40a and the gas A in the gas phase portion 40b (see FIG. 5B).
The liquid L separated by the separation chamber 40 is returned to the suction side 20a of the pump 20 through the first return passage 41 and the second return passage 42 (see FIGS. 4 and 2B).
On the other hand, the gas phase part 40b in the upper part of the separation chamber 40 communicates with the atmosphere via the air vent 45, and the gas A accumulated in the gas phase part 40b is discharged from the air vent 45 to the atmosphere (FIG. 2A). reference).

  Here, the gas-liquid passage 35 has an opening 35 a in the liquid phase portion 40 a of the liquid L accumulated in the separation chamber 40. Therefore, the gas-liquid FA discharged from the separation device 31 passes through the gas-liquid passage 35 and is guided to the liquid phase portion 40a of the separation chamber 40 while maintaining a state not communicating with the atmosphere.

First float valve V1;
A first float valve V <b> 1 is provided between the separation chamber 40 and the first return passage 41. The first float valve V1 includes a first float F1, and opens when the liquid L in the separation chamber 40 reaches a first predetermined amount. When the pump 20 is in operation, the liquid L passes through the first return passage 41. Then, the air passes through the second return passage 42 and is sucked into the suction side 20a of the pump 20. The first float F1 functions to keep the liquid level of the liquid phase portion 40a so as to be always higher than the position of the opening 35a of the gas-liquid passage 35. That is, the first float valve V1 keeps the liquid level of the liquid phase portion 40a at or above a predetermined lower limit level.

Second float valve V2;
On the other hand, the air vent 45 is provided with a second float valve V2. The second float valve V2 includes a second float F2. When the liquid L in the separation chamber 40 exceeds a second predetermined amount, the second float F2 rises and closes the air vent 45. This prevents the liquid L in the separation chamber 40 from being blown out from the air vent 45. Therefore, the second float valve V2 has a function of preventing the liquid L from blowing down when the liquid level of the liquid phase part 40a exceeds a predetermined upper limit level.

Pump 20:
As shown in FIG. 2B, the pump 20, the separation device 31, and the separation chamber 40 are provided in the casing 50 of the pump unit 3.

  In FIG. 2B and FIG. 3A, the pump 20 includes an internal gear pump configured by an internal gear 25, a partition plate 26 and an external gear 27 accommodated in a pump chamber 56, for example. The rotation centers of the internal gear 25 and the external gear 27 are eccentric, and the internal gear 25 is rotated by the rotation of the external gear 27, so that the fuel oil F between the external gear 27 and the internal gear 25 is sucked into the suction side 20a. From the outlet toward the discharge side 20b. A pulley 24 for inputting a driving force is fixed to the end of the rotating shaft 23 (FIG. 6) of the external gear 27.

Next, characteristic parts of the pump unit will be described.
Flange lid 8 and filter lid 9:
As shown in FIG. 6, the flange lid 8 is fixed to the casing 50 of the pump unit 3. A filter lid 9 is fixed to the flange lid 8 with fastening bolts 58 (an example of a fastener). A lower lid 59 having the first return passage 41 (FIG. 1) is provided below the flange lid 8 (see FIG. 4).
In FIGS. 6 and 7, in order to make the flange lid 8 easy to see, the lid that closes a part of the separation chamber 40 is removed.

In the casing 50, the secondary filter 32 is accommodated, and a separation device 31 (FIG. 3B) is formed.
The secondary filter 32 is accommodated in a filter chamber 32 s of FIG. 7 formed in the casing 50, and the separation device 31 is accommodated in a separation device chamber 31 s formed in the casing 50. A communication hole 57 that connects both ends is formed at the end of the separation device chamber 31 s and the end of the secondary filter 32.

The flange lid 8 is configured to allow the liquid L from the through hole 83 closed by the filter lid 9 and the separation device 31 to be introduced into the filter chamber 32 s through the communication hole 57. And a lid portion 84 that closes one end thereof.
Accordingly, the end of the separation device chamber 31s, the communication hole 57, and the end of the filter chamber 32s are respectively closed by the flange lid 8 and the filter lid 9, so that the two-dot chain line arrow L in FIG. In addition, the liquid L separated by the separation device 31 (FIG. 3B) is sent to the secondary filter 32 (FIG. 3B) through the communication hole 57.

As shown in FIG. 7, the filter chamber 32s has a substantially circular end on the opening side in order to accommodate the substantially bottomed cylindrical secondary filter 32 of FIG. 8A (FIG. 3B and FIG. 4B).
The flange lid 8 is formed with a circular through hole 83 that is closed by the filter lid 9. The through hole 83 is formed to have substantially the same diameter as the opening at the end of the filter chamber 32 s, and the secondary filter 32 in the filter chamber 32 s is taken out from the through hole 83 by removing the filter lid 9. Is possible.

鍔 80:
A flange 80 is formed integrally with the flange lid 8 on the flange lid 8. 6 has a substantially U shape or a substantially concave shape in which side plate portions 81 and 81 covering the lower halves on both sides of the filter lid 9 and a bottom plate portion 82 covering the lower end of the filter lid 9 are connected. Consists of formed ridges.

  As shown in FIG. 8A, the bottom plate portion 82 of the flange 80 is provided to be inclined obliquely downward toward the outside of the pump unit 3.

When the secondary filter 32 is replaced, the end of the ridge member 101 having a substantially U-shaped or substantially concave shape in cross section is brought into contact with the periphery of the ridge 80, so that the liquid L in the filter chamber 32s is supplied to the ridge member. The oil is discharged into an oil receiver 100 installed at the other end of 101. A protruding portion 59a is formed on the upper portion of the lower lid 59. The protruding portion 59a can hold the upper end portion of the flange member 101 with the bottom plate portion 82 inclined obliquely downward.
In addition, it is preferable to form the cross-sectional shape of the flange member 101 in a shape along the periphery of the flange 80.

Replacing the secondary filter 32:
In order to replace the secondary filter 32 in FIG. 1, the pump unit 3 is stopped. Here, as described above, the gas-liquid FA discharged from the separation device 31 passes through the gas-liquid passage 35 and is guided to the liquid phase portion 40a of the separation chamber 40 while maintaining a state not communicating with the atmosphere. Therefore, even when the pump 20 is stopped, the liquid L is still filled in the separation device 31 and the filter chamber 32s communicating with the separation device 31 via the communication hole 57 of FIG. Yes.

Next, as shown in FIG. 8A, the tip portion of the flange member 101 is sandwiched between the bottom plate portion 82 and the protruding portion 59 a, and the lower end portion of the flange member 101 is placed on the upper end portion of the oil receiving can 100.
After that, when each bolt 58 is removed and the filter lid 9 is removed so as to open from the lower side (the bottom plate portion 82 side of the ridge 80), the liquid L in the filter chamber 32s flows down the ridge 80 and the ridge member 101, and the oil receiving can Accumulate at 100.
As described above, the fuel oil in the filter chamber 32s flows down to the saddle member 101 via the saddle 80, so that the fuel oil can be prevented from being accidentally spilled.

As shown in FIG. 8B, the oil receiving can 100 is directly placed between the bottom plate portion 82 and the protruding portion 59a of the rod 80 without using the rod member 101 so as to receive the liquid L in the filter chamber 32s. May be.
In such a case, it is preferable to use the oil receiving can 100 that is curved outward so that the upper end portion of the oil receiving can 100 fits between the bottom plate portion 82 and the protruding portion 59a of the flange 80.

  The present invention can be applied to an oil discharge structure of a fuel oil pump unit built in a measuring machine at a gas station or the like.

It is a schematic block diagram which shows the oil supply system using the pump unit concerning one Example of this invention. It is a schematic sectional drawing which shows a pump unit. It is a schematic sectional drawing which shows a pump unit. 4A is a schematic front view of the pump unit, and FIG. 4B is a schematic cross-sectional view thereof. It is a schematic sectional drawing which shows a pump unit. It is a schematic perspective view which shows a pump unit. It is a schematic exploded perspective view which shows the oil drain structure of a pump unit. FIG. 8A is a schematic sectional view showing an oil draining method, and FIG. 8B is a schematic sectional view showing another oil draining method.

Explanation of symbols

3: Pump unit 8: Flange lid 9: Filter lid 20: Pump 31: Separation device 32: Secondary filter 32s: Filter chamber 40: Separation chamber 50: Casing 58: Bolt (fastener)
59a: Protruding portion 80: ridge 81: side plate portion 82: bottom plate portion 83: through hole 84: lid portion 101: ridge member A: gas (gas)
F: Fuel oil FA: Gas liquid L: Liquid

Claims (5)

A separation device that swirls fuel oil discharged from a pump to separate it into gas-liquid and liquid containing gas, a separation chamber that separates gas from the gas-liquid separated by the separation device, and the pump In the fuel oil pump unit provided in the casing,
A filter for filtering the liquid received from the separation device and leading to the outlet of the casing;
A filter chamber containing the filter;
A filter lid fastened to the casing with a fastener and allowing the filter to be removed from the filter chamber;
An oil drainage structure for a fuel oil pump unit comprising a flange made of a protrusion formed in a substantially U shape or a substantially concave shape so as to cover a lower portion of the filter lid.   2. The fuel oil according to claim 1, wherein a side plate portion that covers a side of the filter lid and a bottom plate portion that covers a lower end of the filter lid are connected to each other to form the substantially U-shaped or substantially concave shape. The oil discharge structure of the pump unit.   3. The oil drainage structure for a fuel oil pump unit according to claim 2, wherein the bottom plate portion of the rod is inclined obliquely downward toward the outside.   4. The oil drainage structure for a fuel oil pump unit according to claim 3, further comprising a projecting portion capable of holding the upper end of the flange member between the bottom plate portion inclined obliquely downward. 5. The separation device according to claim 1, wherein the through hole closed by the filter lid and the liquid from the separation device can be introduced into the filter chamber. A flange lid provided with a lid portion for closing one end;
An oil discharge structure of a fuel oil pump unit in which the flange is formed on the flange lid.

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