JP2013064349A - Pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the interval of maintenance of a strainer.SOLUTION: The strainer 44 is held by fitting the outer periphery of a fitting section 44b with an inflow-side opening 44a on a mounting section 38a of a connection part 38. A wire gauze 44c in a bottomed cylindrical shape is connected to the fitting section 44b. A centerline O1 of the strainer 44 and a centerline O2 of a flow path opening 38c of the connection part 38 are installed in a position (eccentric position) at a distance of L. A liquid flowing into a flow path 38b from the flow path opening 38c through a flow path 37a of an inflow slot 37 flows in a helical manner along an inner wall of the flow path 38b. The helical flow flows into the inflow-side opening 44a of the strainer 44, and becomes a helical swirl flow 90 along the circumference of the wire gauze 44c in the bottomed cylindrical shape, in the strainer 44. A foreign object deposited section 45 which projects in a hook shape towards the center from the inside of the wire gauze 44c is installed circumferentially in the strainer 44 at intervals of 120 degrees.

Description

  The present invention relates to a pump unit, and more particularly to a pump unit configured to supply liquid fuel.

For example, a fuel supply device that supplies liquid fuel is equipped with a pump unit that delivers liquid fuel. In this type of pump unit, devices such as a strainer, a check valve, a rotor chamber, a gas-liquid separation chamber, a relief valve, an air separation chamber, and a filter are accommodated in one housing (for example, see Patent Document 1). .
The pump unit to which piping from the underground tank is connected is provided with a strainer near the inlet for removing foreign substances contained in the liquid fuel. The strainer reduces the installation space and increases the surface area. Therefore, the wire mesh portion is formed in a cylindrical shape.

JP-A-5-39790

  In the conventional pump unit, foreign matter adheres to the inner periphery of the strainer. For this reason, a strainer that has been replaced or cleaned with a new one is attached when the foreign matter adhesion area exceeds a predetermined percentage of the total surface area of the strainer.

  However, if a part of the wire mesh is clogged in the strainer, the liquid can pass from the other part, so there is no need to replace or clean the strainer. If it uniformly adheres to the entire surface, the entire wire mesh becomes clogged in a relatively short period of time, so that there is a problem that the strainer needs to be replaced and cleaned, and the number of replacement and cleaning increases.

  In view of the above circumstances, an object of the present invention is to provide a pump unit that solves the above problems.

In order to solve the above problems, the present invention has the following means.
(1) The present invention relates to a pump that communicates with an inflow port through which liquid flows in via an inflow channel, and discharges the liquid sucked from the inflow port to the outflow channel, and is provided in the middle of the inflow channel. In a pump unit having a cylindrical strainer that removes foreign substances from the liquid sucked from the inlet by operation,
A foreign matter depositing portion extending in the longitudinal direction of the strainer so as to deposit the foreign matter in the strainer, and projecting toward the center of the strainer;
Swirl flow generating means for guiding the flow direction of the liquid so as to generate a swirl flow in the liquid flowing into the strainer;
It is characterized by having.
(2) The swirling flow generating means includes a connecting portion that connects the inlet and the inflow side of the strainer, and the connecting portion allows the liquid from the inlet to rotate in the strainer. The flow path opening is connected to the inflow side of the strainer.
(3) The swirl flow generating means of the present invention is a liquid guide portion that is provided on the inner periphery on the inflow side of the strainer and guides the flow direction of the liquid in the peripheral direction of the strainer.
(4) The foreign matter accumulation portion of the present invention is formed in a bowl shape whose tip is bent in the opposite direction to the swirl flow so as to face the swirl flow of the liquid generated by the swirl flow generating means. Features.

  According to the present invention, a foreign matter accumulation portion that projects so as to deposit foreign matter in the liquid from the inlet on the inner periphery of the strainer, and a flow direction of the liquid is guided so as to generate a swirling flow in the liquid flowing into the strainer. And a swirl flow generating means. The maintainability of the strainer can be improved.

It is a schematic block diagram which shows typically one Example of the pump unit by this invention. It is a figure which shows the flow of the liquid in this pump unit in order. It is a cross-sectional view which follows the X1-X1 line | wire which shows the attachment structure of a strainer. It is a cross-sectional view which follows the Y1-Y1 line | wire which shows the attachment structure of a strainer. It is a side view which shows the attachment structure of a strainer. It is a figure which shows the structure of a strainer, (A) is a side view, (B) is AA sectional drawing. It is a cross-sectional view which follows the X2-X2 line of a modification. It is a cross-sectional view which follows the Y2-Y2 line of a modification. It is a side view which shows the attachment structure of the strainer of a modification. It is a figure which shows the structure of the strainer of a modification, (A) is a side view, (B) is BB sectional drawing, (C) is CC sectional drawing.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Configuration of pump unit]
FIG. 1 is a schematic configuration diagram schematically showing an embodiment of a pump unit according to the present invention. FIG. 2 is a diagram illustrating the flow of liquid in the pump unit in order.

  As shown in FIGS. 1 and 2, the pump unit 10 is mounted on a fuel supply device that supplies liquid fuel (hereinafter referred to as “liquid”) such as gasoline or light oil, and is stored in the underground tank 12. The air bubbles are pumped up, and bubbles contained in the liquid are separated and fed to the flow meter 20. The liquid fuel measured by the flow meter 20 is supplied to the fuel tank of the vehicle through the hose and nozzle of the fuel supply device.

  In the pump unit 10, an inflow chamber 31, a rotor chamber 32, an air separation chamber 33, an outflow path 34, a bypass path 35, and a gas-liquid separation chamber 36 are formed in the casing 30. The inflow chamber 31 communicates with an inflow port 37 and a connecting portion 38 that open to the bottom of the casing 30, and an inflow side check valve 40 is provided.

  The inflow check valve 40 is urged in the valve closing direction by a coil spring 42 and is opened by a pump suction force. Further, a strainer 44 formed in a cylindrical shape is provided on the upstream side of the inflow side check valve 40, and foreign matter in the liquid is captured by the strainer 44 and removed from the liquid flowing out downstream.

  By opening the inflow side check valve 40, the liquid that has flowed into the strainer 44 from the inlet 37 passes through the flow path 46 and reaches the rotor chamber 32 after the foreign matter is removed. The rotor chamber 32 is provided with a vane pump (rotary pump) 48. The vane pump 48 has a rotor 50 that rotates by receiving the rotational driving force of the motor, and sends out the liquid that flows between the vanes 52 of the rotor 50 and the rotor chamber 32 to the air separation chamber 33.

  The air separation chamber 33 is formed of a tapered cyclone, and has a bottom portion communicating with the filter 54 and a small hole 56 for collecting a gas-enriched liquid containing gas at the top. The small hole 56 communicates with the gas-liquid separation chamber 36 through the bypass path 35 and the pipe 58.

  The gas-liquid separation chamber 36 is provided with a return hole 60 for returning the liquid to the rotor chamber 32 of the pump 48 at the bottom, and an air opening hole 62 at the ceiling. The gas-liquid separation chamber 36 is provided with a float valve 70 that opens and closes the return hole 60.

  The float valve 70 has a valve portion that opens the return hole 60 when the liquid level of the liquid containing the gas-enriched liquid in the gas-liquid separation chamber 36 is equal to or higher than a predetermined height.

  In the gas-liquid separation chamber 36, bubbles (gas) contained in the liquid float up in the upper space and are discharged into the atmosphere from the atmosphere opening hole 62. Further, the liquid from which the bubbles are separated is returned to the rotor chamber 32 of the pump 48 by passing through the return hole 60 by opening the float valve 70 when the liquid level reaches a predetermined height.

  In the air separation chamber 33, the liquid from which the gas-enriched liquid has been separated is filtered by the filter 54, passes through the outflow path 34, and is supplied to the flow meter 20. The outflow check valve 64 provided in the outflow path 34 is opened by the pressure of the liquid sent out by the pump 48.

In addition, the pump unit 10 is provided with a relief valve 80, and a part of the liquid filtered by the filter 54 is opened when the fluid pressure in the flow path increases more than necessary. The valve is returned to the rotor chamber 32 of the pump 48. The relief valve 80 is biased in the valve closing direction by the spring force of the coil spring 82, and corresponds to the difference between the discharge pressure of the outflow path 34 and the resultant force of the spring force of the coil spring 82 plus the suction pressure of the rotor chamber 32. The valve is repeatedly opened and closed by balancing the resultant force of the spring force, the discharge pressure, and the suction pressure.
[Configuration of strainer 44]
FIG. 3 is a cross-sectional view taken along line X1-X1 showing the strainer mounting structure. FIG. 4 is a cross-sectional view along the line Y1-Y1 showing the strainer mounting structure.

  As shown in FIGS. 3 and 4, in the strainer 44, a fitting portion 44b having an inflow side opening 44a and a bottomed cylindrical wire mesh 44c are integrated. Further, the strainer 44 is held by the connecting portion 38 by fitting the outer periphery of the fitting portion 44 b to an attachment portion 38 a formed on the side wall of the connecting portion 38.

  In the present embodiment, the inlet 37 and the strainer 44 are connected by the connecting portion 38, and the relative positional relationship between the flow path opening 38c of the connecting portion 38 and the inflow side opening 44a of the strainer 44 is as follows. This constitutes the swirling flow generating means of the present invention. That is, the connecting portion 38 is connected so that the flow passage opening 38c is positioned on the side of the inflow side opening 44a of the strainer 44, whereby the center line O1 of the strainer 44 and the flow passage of the connecting portion 38 in FIG. The center line O2 of the opening 38c is provided at a position (eccentric position) that is a distance L away. Therefore, the liquid that flows out from the flow path opening 38c to the flow path 38b through the flow path 37a of the inflow port 37 becomes a spiral flow along the inner wall of the flow path 38b. Thereafter, since the spiral flow flows into the inflow side opening 44a of the strainer 44, the spiral swirl flow 90 along the circumference of the bottomed cylindrical wire mesh 44c (see FIG. 3). In FIG. 5, it is indicated by an arrow. The strainer 44 does not have to be cylindrical. For example, the present invention can be applied even if the strainer 44 has a square cross section.

  As shown in FIG. 5, since the liquid that has flowed into the strainer 44 flows spirally, the liquid flows out from the inside to the outside of the entire circumferential surface of the cylindrical wire mesh 44 c.

  As shown in FIGS. 6A and 6B, the strainer 44 is formed to extend from the inflow side opening 44a in the axial direction (longitudinal direction) of the bottomed cylindrical wire mesh 44c. Also, inside the strainer 44, foreign matter depositing portions 45 formed along the axial direction and bent in a bowl shape from the inside to the center of the wire mesh 44c are provided at intervals of 120 degrees in the circumferential direction. The foreign material depositing part 45 may be formed of the same material as that of the wire mesh 44c, or may be attached so as to fix other members. Further, the number of foreign matter depositing portions 45 is not limited to three, but may be one or two, or four or more.

  Further, each foreign material accumulation portion 45 is formed along the axial direction of the strainer 44 and is provided so as to protrude from the circumference toward the center side of the strainer 44, and the tip 45 a of the circumference is opposed to the flow direction of the swirl flow 90. It is bent in an L shape in the direction (reverse direction). Therefore, each foreign material accumulation portion 45 faces the flow direction of the swirling flow 90 generated by the relative position (swirl flow generating means) of the flow passage opening 38c of the connecting portion 38 with respect to the inflow side opening 44a of the strainer 44. The foreign matter in the swirled liquid is efficiently captured and collected inside the foreign matter accumulation portion 45.

  In this manner, the foreign matter accumulation portion 45 is formed in a bowl shape (L-shape) formed such that the tip 45a extends in the circumferential direction of the strainer 44 in the opposite direction (opposing direction) to the swirling flow 90, Since it stands up so as to oppose the flow of the liquid swirling spirally, the foreign matter 43 contained in the liquid is swirled inside the wire net 44c by the swirl flow 90 and inside the foreign matter accumulation portion 45. Adhere and gradually accumulate. That is, the foreign matter 43 in the liquid is gradually deposited on the inner surface of the foreign matter depositing portion 45, thereby preventing the foreign matter from being uniformly attached to the entire inner peripheral surface of the wire mesh 44c.

Further, the foreign matter 43 is concentrated in the vicinity of the inside of the foreign matter depositing portion 45 by the swirling flow 90 by the swirling flow generating means (arrangement of the flow path opening 38c of the connecting portion 38). Thus, a portion to which the foreign matter 43 is not attached (a portion through which the liquid can pass) is formed, and the maintenance interval until the entire surface of the wire mesh 44c is clogged after the strainer 44 is cleaned or replaced is extended. Further, the maintenance work of the strainer 44 includes a work of replacing the strainer 44 and a cleaning work of removing the foreign matter attached to the strainer 44. Therefore, the cleaning or replacement time of the strainer 44 can be extended and the number of maintenance can be reduced.
[Modification]
FIG. 7 is a cross-sectional view taken along line X2-X2 of the modification. FIG. 8 is a cross-sectional view taken along line Y2-Y2 of the modification. As shown in FIGS. 7 and 8, the strainer 100 includes a liquid guide portion 110 that guides the flow direction of the liquid inside the inflow side opening 100a. In addition, the strainer 100 is held by fitting the fitting portion 100 b to the attachment portion 38 a of the connecting portion 38. In the present modification, the center of the flow path opening 38 c of the connecting portion 38 is provided so as to coincide with the center of the inflow port 37 and to be positioned on the axial line of the strainer 100.

  As shown in FIG. 9, the liquid guide part 110 constitutes a swirl flow generating means of a modified example, and is provided at three intervals in the circumferential direction at intervals of 120 degrees, and is centered from the inner periphery of the inflow side opening 100a. The guide surface 112 which protrudes toward the side and has a spiral curved surface is provided on the inflow side opening 100 a side of the strainer 44.

  As shown in FIGS. 10A to 10C, the guide surface 112 of the liquid guide portion 110 is inclined in a swirl direction that is oblique with respect to the axial direction in which the liquid flows like a turbine blade. . Therefore, the liquid that has flowed into the liquid guide part 110 from the flow path 38a of the connecting part 38 moves along the curved surface of the guide surface 112 to become a swirl flow 120 (indicated by arrows in FIGS. 7 to 9). It flows into the internal space of the wire mesh 100c.

  Furthermore, inside the wire mesh 100c located on the downstream side of the liquid guide portion 110, the wire mesh 100c is arranged such that the tip 45a of the foreign matter accumulation portion 45 described above is in the opposite direction (opposite direction) to the flow direction of the swirl flow 120. It is formed in a bowl shape so as to extend in the circumferential direction.

  Therefore, the foreign matter 43 contained in the liquid swirls inside the wire mesh 100c in the process of passing through the guide surface 112 of the liquid guide portion 110 by the swirling flow 120, while the inside of the foreign matter accumulation portion 45 formed in a bowl shape. Adheres to the wall and gradually accumulates. In this way, the foreign matter 43 in the liquid is gradually deposited on the inner surface of the foreign matter depositing portion 45, thereby preventing the foreign matter from uniformly adhering to the entire inner peripheral surface of the wire net 100c.

  Further, as the foreign matter 43 is concentrated in the vicinity of the foreign matter depositing portion 45 by the swirling flow 120 by the swirling flow generating means, the portion where the foreign matter 43 is not attached (the portion through which the liquid can pass) is the wire mesh 100c. As a result, the maintenance interval until the entire surface of the wire mesh 100c is clogged after the strainer 100 is cleaned or replaced is extended. Therefore, the cleaning or replacement time of the strainer 100 can be extended and the number of maintenance can be reduced.

  In this modification, the guide part 110 as the swirl flow generating means is provided in the inflow side opening 100a of the strainer 100. However, the flow path 38a of the connecting part 38 shown in FIGS. A swirl flow may be more easily generated by combining the eccentric configuration and the liquid guide portion 110 according to the modification.

  In addition, for example, a connecting portion 38 between the strainer 100 and the inflow port 37 may be configured to easily generate a swirling flow by attaching a liquid guide portion 110 as swirling flow generating means.

  In the above embodiment, the pump unit configured to supply liquid fuel such as gasoline has been described as an example. Of course you can.

DESCRIPTION OF SYMBOLS 10 Pump unit 12 Underground tank 20 Flowmeter 30 Casing 31 Inflow chamber 32 Rotor chamber 33 Air separation chamber 34 Outflow path 35 Bypass path 36 Gas-liquid separation chamber 37 Inlet 38 Connection part 38a Attachment part 38b Channel 38c Channel opening 40 Inflow Side check valve 44, 100 Strainer 44a, 100a Inflow side opening 44b, 100b Fitting portion 44c, 100c Wire net 45 Foreign matter accumulation portion 48 Vane type pump 50 Rotor 54 Filter 56 Small hole 58 Pipe 60 Return hole 62 Atmospheric release hole 70 Float Valve 80 Relief valve 90, 120 Swirling flow 110 Liquid guide part 112 Guide surface

Claims (4)

A pump that communicates with the inlet through which the liquid flows in through the inlet and discharges the liquid sucked from the inlet into the outlet, and is provided in the middle of the inlet by the suction operation of the pump. In a pump unit having a cylindrical strainer that removes foreign substances from the liquid that has been diluted,
A foreign matter depositing portion extending in the longitudinal direction of the strainer so as to deposit the foreign matter in the strainer, and projecting toward the center of the strainer;
Swirl flow generating means for guiding the flow direction of the liquid so as to generate a swirl flow in the liquid flowing into the strainer;
A pump unit comprising:   The swirl flow generating means includes a connecting portion that connects the inlet and the inflow side of the strainer, and the connecting portion has a flow path of the connecting portion so that the liquid from the inlet turns in the strainer. The pump unit according to claim 1, wherein the opening and the inflow side of the strainer are connected.   The said swirl | vortex flow generation means is a liquid guide part which is provided in the inner periphery of the inflow side of the said strainer, and guides the flow direction of the said liquid to the circumferential direction in the said strainer. Pump unit. 2. The foreign matter accumulating portion is formed in a bowl shape whose tip is bent in a direction opposite to the swirling flow so as to face the swirling flow of the liquid generated by the swirling flow generating means. The pump unit according to any one of 3 to 3.

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