JP2004251287A - Filter used in washer pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter to be used in a washer pump in which a water film on the filter can be broken to suck cleaning liquid into a pump chamber to be securely discharged from a liquid discharge port by evacuating a pump chamber to make it at negative pressure even when the water film is formed on the filter. <P>SOLUTION: This filter 30, disposed in a liquid suction port 16 in the washer pump, is provided with the pump chamber containing an impeller in a case, so that cleaning liquid is sucked from the liquid suction port 16 into the pump chamber by rotation of the impeller, while cleaning liquid is discharged from the liquid discharge port. It is formed in a roughly cylindrical form having a bottom. Mesh filtration parts are formed at a circumferential wall 32 and a bottom wall 33. In part of the circumferential wall 32, a duct part 34 is provided to be semi-cylindrically formed to have a V-letter type cross section, and protruded from the bottom wall 32. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a filter used for a washer pump that sucks a cleaning liquid stored in a washer tank and sprays the cleaning liquid from a nozzle.

  As this type of washer pump, there is one shown in FIGS. 13 and 14 (for example, see Patent Document 1). As shown in FIG. 13, the washer pump 1 is attached to a liquid outlet 5b formed in a side wall 5a of the washer tank 5 via a cylindrical communication member 6 whose outer periphery is fitted. In a pump case 2 of the washer pump 1, a motor chamber 2a accommodating an armature 3 that rotates when energized and a pump chamber 2b accommodating an impeller 4 that rotates while being coupled to an armature shaft 3a of the armature 3, respectively. It is formed. A cylindrical liquid suction port 2 c communicating with the pump chamber 2 b is fitted on the inner periphery of the communication member 6. Further, as shown in FIG. 14, a filter 7 for filtering the cleaning liquid W is mounted in the communication member 6.

  When predetermined power is supplied to the washer pump 1 from a power supply connector 2e via a switch (not shown), the rotation of the armature 3 causes the impeller 4 to rotate in the pump chamber 2b. By the rotation of the impeller 4, the cleaning liquid W stored in the washer tank 5 is sucked into the pump chamber 2b from the liquid suction port 2c, and the cleaning liquid W is discharged from the liquid discharge port 2d communicating with the pump chamber 2b. The cleaning liquid W discharged from the liquid discharge port 2d is supplied to a nozzle 9 through a liquid supply pipe 8, and is jetted from the nozzle 9 to a cleaning surface (not shown).

  Further, while the cleaning liquid W is sucked from the liquid delivery port 5b of the washer tank 5 through the communication member 6 to the liquid suction port 2c of the washer pump 1, the mesh-shaped filtering portion 7a of the filter 7 provided in the communication member 6 As a result, foreign substances such as dust are removed and filtered, so that foreign substances are not sucked into the pump chamber 2b of the washer pump 1. This prevents breakage of the impeller 4 due to foreign matter in the pump chamber 2b, clogging of the nozzle 9, and the like.

JP-A-2-60659

  However, since the conventional washer pump 1 employs a centrifugal method (a centrifugal method in which suction is not possible) in which suction pressure is very small, air in the pump chamber 2b is evacuated when the washer pump 1 operates. The inside of the pump chamber 2b cannot be set to a negative pressure, and the impeller 4 may run idle and the cleaning liquid W may not be discharged from the liquid discharge port 2d of the pump chamber 2b. In particular, when the communication member 6 is provided with a filter 7 having a mesh-shaped filtration portion 7a, or when a check valve (return valve) is provided in the liquid supply pipe 8 that connects the pump chamber 2b and the nozzle 9 and the like. In this case, when the cleaning liquid W is injected into the washer tank 5, the water film stretched on the filter 7 cannot be broken when the washer pump 1 is operated due to the surface tension, and the impeller 4 idles and the liquid discharge port of the pump chamber 2b. The phenomenon that the cleaning liquid W was not discharged from 2d was remarkable.

  Therefore, the present invention has been made to solve the above-described problem, and even if a water film is formed on the filter, the air in the pump chamber is evacuated and the pressure in the pump chamber is reduced to reduce the water film of the filter. It is an object of the present invention to provide a filter used for a washer pump that can be broken to suck a cleaning liquid into a pump chamber and reliably discharge the cleaning liquid from a liquid discharge port.

  The invention according to claim 1 is a filter which is disposed in the liquid suction port of a washer pump having a cylindrical liquid suction port and is used for the washer pump. The bottom wall has a mesh-shaped filtering portion, and a part of the peripheral wall is provided with a duct portion formed in a semi-cylindrical shape having a V-shaped cross section and protruding from the bottom wall. I do.

  According to a second aspect of the present invention, there is provided a filter for use in the washer pump according to the first aspect, wherein the duct portion is not provided with the mesh filter portion.

  As described above, according to the filter used in the washer pump according to the first and second aspects of the present invention, the filter function and the duct function can be covered by one component only by disposing the filter in the liquid suction port of the washer pump. Thus, the cleaning liquid can be sucked into the pump chamber from the liquid suction port communicating with the pump chamber, and can be reliably discharged from the liquid discharge port.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view taken along line AA in FIG. 3 showing a washer pump according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 4, FIG. 4 is a cross-sectional view taken along line CC in FIG. 2, FIG. 5 is a vertical cross-sectional view of a liquid suction port portion of the washer pump, FIG. 6 is a perspective view of a filter used in the washer pump, and FIG. 8 is a rear view of the filter, FIG. 9 is a plan view of the filter, FIG. 10 is a side view of the filter, FIG. 11 is a bottom view of the filter, and FIG. 12 is an attached state of the washer pump. FIG.

  As shown in FIGS. 1, 2, and 12, a washer pump 10 is a synthetic resin cylindrical communication member whose outer periphery is fitted to a liquid outlet 5b formed in a side wall 5a of a synthetic resin washer tank 5. 6, a motor chamber 11A that houses an armature 20 that rotates when energized, and a pump chamber 11B that houses an impeller 22 that rotates when connected to an armature shaft 21 of the armature 20. And is provided in a partitioned state. Then, the cleaning liquid W is sucked into the pump chamber 11B by the rotation of the impeller 22 from the liquid suction port 16 communicating with the pump chamber 11B, and the cleaning liquid W is discharged from the liquid discharge port 18 communicating with the pump chamber 11B. Has become. The cleaning liquid W discharged from the liquid discharge port 18 is supplied to a pair of nozzles 9, 9 through a liquid supply pipe 8, and is jetted from the pair of nozzles 9, 9 to a cleaning surface (not shown). I have.

  As shown in FIGS. 1 and 2, the case 11 includes a cylindrical pump case 12 made of synthetic resin that forms a motor chamber 11 </ b> A in a peripheral wall 12 a having an open upper surface, and a bottom wall (partition) of the pump case 12. The pump cover 13 has a substantially U-shaped cross section and is made of synthetic resin, which is fixed to the outer peripheral portion 12d of the wall 12c by, for example, welding or the like to form the pump chamber 11B therein, and fits into the inner periphery of the opening 12b of the pump case 12. And a motor cover 14 made of synthetic resin. A power supply connector 15 made of synthetic resin is fitted around the outer periphery of the opening 12b of the pump case 12.

  A metal-made cylindrical yoke 23 is fixed to the inner peripheral surface of the peripheral wall 12 a of the pump case 12. A magnet 24 is fixed to the inner peripheral surface of the yoke 23 via a fixing means such as a spring or an adhesive. Then, between the bearing 25 fitted to the spherical concave portion 14a at the center of the motor cover 14 and the bearing 26 fitted to the spherical inner peripheral surface of the cylindrical portion 12e at the center of the bottom wall 12c of the pump case 12. The upper end 21a and the lower part 21c of the armature shaft 21 are rotatably supported. Further, a space between the cylindrical portion 12e at the center of the bottom wall 12c of the pump case 12 and the lower portion 21c of the armature shaft 21 is sealed by an annular seal body 27. The motor chamber 11A is kept watertight with respect to the pump chamber 11B by the seal body 27.

  An armature 20 is attached to a position of the armature shaft 21 facing the magnet 24. The armature 20 is fixed substantially at the center of the armature shaft 21 in the axial direction, and has an armature core 20a having a coil winding portion 20b having a predetermined number of slots, and an armature wound around the coil winding portion 20b of the armature core 20a. And a coil 20c.

  A commutator 28 is fixed to the upper part 21b of the armature shaft 21. The commutator 28 has the same number of commutator pieces 28a as the coil winding portions 20b of the armature core 20a, and each commutator piece 28a and the armature coil 20c are electrically connected.

  Further, a pair of brush holder portions 14b, 14b is fixed at a position facing the commutator 28 of the motor cover 14, and a brush 29 is attached to each of the brush holder portions 14b. Each brush 29 is electrically connected to a washer circuit (not shown) through a pair of terminals 15b, 15b of the power supply connector 15. When a washer switch (not shown) is turned on, a current flows to the armature 20 through the pair of terminals 15b, 15b extending into the connector insertion portion 15a of the power supply connector 15, the brushes 29, and the commutator piece 28a. Thus, the armature shaft 21 rotates forward.

  The cylindrical portion 22a of the impeller 22 is connected to the lower end 21d of the armature shaft 21 so as to be relatively non-rotatable in the circumferential direction and slidable in the axial direction. A plurality of blade portions 22b are integrally formed on the outer periphery of the cylindrical portion 22a radially at regular intervals.

  As shown in FIGS. 1, 5, and 12, a cylindrical liquid suction port 16 is integrally formed on the bottom wall 12c of the peripheral wall 12a of the pump case 12. The washer pump 10 is attached to the washer tank 5 by fitting the cylindrical liquid suction port 16 into the inner periphery of the cylindrical communication member 6 of the washer tank 5. The liquid suction port 16 communicates with the pump chamber 11B via a hole-shaped liquid introduction portion 17 formed in the center of the bottom wall 12c. Further, as shown in FIGS. 1 and 5, near the outer peripheral edge (on the side of the peripheral wall 12a) of a bottom wall 12c as a partition wall separating the pump chamber 11B and the motor chamber 11A, a ventilation hole 12f serving as an air vent hole is provided in the axial direction. It is formed so as to penetrate (vertically). The liquid inlet 16 and the pump chamber 11B are also in communication with each other through the vent hole 12f.

  As shown in FIGS. 2 and 4, a predetermined interval in the circumferential direction is provided at a central portion in the axial direction (vertical direction) of a bottom wall 12 c as a partition wall separating the motor chamber 11 </ b> A and the pump chamber 11 </ b> B. A plurality of formed chambers 19 are provided. In the present embodiment, a pair of chambers 19, 19 are provided at mutually symmetric positions in the circumferential direction. That is, concave portions 12g are formed at symmetrical positions in the circumferential direction from the axial center portion of the outer peripheral edge of the outer peripheral portion 12d of the bottom wall 12c, and the pair of concave portions 12g, 12g and the pump are formed. Chambers 19 and 19 are formed with the peripheral wall 13a of the cover 13, respectively. As shown in FIGS. 2 and 4, the bottom wall 12c of the pump case 12 inside the upper surface 19a of each chamber 19 passes through the inside air vent hole 12h communicating with the motor chamber 11A in the axial direction (vertical direction). Respectively. As shown in FIGS. 2 and 3, the outer peripheral portion of the bottom wall 13c of the pump cover 13 located axially below the outer peripheral edge of the bottom wall 12c of the chamber lower surface 19b of each chamber 19 has a predetermined circumferential direction. A plurality of outside air vents 13h communicating with the outside air are formed at intervals.

  Further, as shown in FIG. 2, the chamber lower surface 19b of each chamber 19 is formed as a conical inclined surface such that the distance from the chamber upper surface 19a increases as approaching the outer periphery of the bottom wall 12c. The upper surface 12i of the bottom wall 12c of the chamber upper surface 19a is formed as a conical inclined surface that inclines upward in the axial direction (vertical direction) from the center in the radial direction toward the outer periphery. With the inclined upper surface 12i, water accumulated in the motor chamber 11A can be reliably discharged from the inside air communication hole 12h to the outside through the inclined chamber lower surface 19b of each chamber 19 and the outside air ventilation hole 13h. I have.

  As shown in FIG. 2, a gap t is formed between the outer peripheral portion 12 d of the bottom wall 12 c of the pump case 12 and the distal end portion 13 b of the peripheral wall 13 a of the pump cover 13.

  Further, as shown in FIGS. 1 and 3, a cylindrical liquid discharge port 18 is integrally formed at a position of the peripheral wall 13a of the pump cover 13 facing the liquid suction port 16. The cylindrical liquid discharge port 18 is connected to each nozzle 9 via the liquid supply pipe 8.

  As shown in FIGS. 1 and 5, a filter 30 for filtering the cleaning liquid W is detachably mounted in the liquid suction port 16 of the pump case 12. The filter 30 includes a filter body 31 made of a synthetic resin that is fitted into the liquid suction port 16 and filters the cleaning liquid W passing through the liquid suction port 16. As shown in FIGS. 5 to 11, the filter main body 31 is formed in a substantially cylindrical shape with a bottom, and the peripheral wall 32 and the bottom wall 33 have a mesh-like shape for removing foreign matter such as dust in the cleaning liquid W and filtering the same. It is a filtration unit. A part of the peripheral wall 32 forms a semi-cylindrical (front-reverse V-shaped groove) duct portion (air passage) 34 extending in the longitudinal direction. As shown in FIGS. 1 and 5, the duct portion 34 extends horizontally from the opening side of the filter body 31 to the outside of the bottom wall 33, and is inserted into the liquid suction port 16 of the pump case 12. When the fitting 31 is fitted, the notch 34a on the bottom surface of the rear portion of the duct portion 34 is in close contact with the stepped flat surface mounting portion 16a in the cylindrical liquid suction port 16 and the rear portion of the duct portion 34 Communicates with a vertical ventilation hole 12f formed through the bottom wall 12c that separates the pump chamber 11B and the liquid suction port 16 without any gap. Thereby, the air in the pump chamber 11B is blown out from the vent hole 12f into the washer tank 5 through the duct 34 as shown by the arrow in FIG. Further, as shown in FIG. 11, the duct portion 34 is not formed with a mesh-shaped filtering portion.

  As shown in FIG. 12, the cleaning liquid inlet 5c of the washer tank 5 is covered by a synthetic resin lid 5d.

  According to the washer pump 10 of the embodiment described above, when the cleaning liquid W is injected from the cleaning liquid inlet 5 c of the washer tank 5, a water film is formed on the peripheral wall 32 and the bottom wall 33, which are the mesh-shaped filtering portions of the filter 30. Since the cleaning liquid W does not enter the pump chamber 11B due to the water film of the filter 30, the pump chamber 11B is filled with air.

  When a predetermined power supply current is supplied from the power supply connector 15 to the armature 20 of the washer pump 10 via a switch (not shown), the armature 20 rotates. Due to the rotation of the armature 20, the impeller 22 non-rotatably coupled to the armature shaft 21 rotates in the pump chamber 11B of the washer pump 10, and a positive pressure of air is applied to the outer peripheral portion in the pump chamber 11B. As a result, the air in the pump chamber 11B is blown into the washer tank 5 from the vent hole 12f of the pump case 12 through the duct portion 34 of the filter 30 as shown by an arrow in FIG. Due to the ejection of the air, the inside of the pump chamber 11B becomes negative pressure.

  Due to the action of the negative pressure, the water film on the peripheral wall 32 and the bottom wall 33, which are the mesh-like filtering portions of the filter 30, is broken, and the cleaning liquid W enters the pump chamber 11B. The washing liquid W stored in the washer tank 5 is suctioned from the liquid suction port 16 into the pump chamber 11B via the liquid inlet 17 by the plurality of blades 22b of the impeller 4 rotated by the armature 20, and the pump The cleaning liquid W is discharged from the liquid discharge port 18 communicating with the chamber 11B. The cleaning liquid W discharged from the liquid discharge port 18 is supplied to the nozzle 9 through the liquid supply pipe 8, and is jetted from the nozzle 9 to a cleaning surface (not shown).

  Further, while the cleaning liquid W is sucked into the liquid suction port 16 of the washer pump 10 from the liquid delivery port 5b of the washer tank 5 through the communication member 6, the mesh of the filter body 31 fitted to the liquid suction port 16 is formed. Since foreign matter such as dust is removed and filtered by the peripheral wall 32 and the bottom wall 33 which are the filter portions, the foreign matter is not sucked into the pump chamber 11B of the washer pump 10. This reliably prevents damage to the impeller 22 due to foreign matter in the pump chamber 11B, clogging of the nozzle 9, and the like.

  As described above, the filter main body 31 of the filter 30 for filtering the washing liquid W is fitted into the liquid suction port 16 of the washer pump 10, and the filter main body 31 is integrally formed with the duct portion 34 as an air passage. Since the portion 34 communicates with the pump chamber 11B through the vent hole 12f formed in the bottom wall 12c separating the pump chamber 11B of the washer pump 10 and the liquid suction port 16, even if a water film is formed on the filter body 31. The water in the filter main body 31 can be broken by drawing the air in the pump chamber 11B into the washer tank 5 through the ventilation hole 12f and the duct portion 34 to make the inside of the pump chamber 11B a negative pressure. Thus, the cleaning liquid W can be sucked into the pump chamber 11B and reliably discharged from the liquid discharge port 18. At this time, the filter function and the duct function can be covered by one filter 30.

  A pair of chambers 19 is formed between a bottom wall 12c separating the motor chamber 11A and the pump chamber 11B of the washer pump 10 and a peripheral wall 13a of the pump cover 13, and a bottom of a chamber upper surface 19a of each chamber 19 is formed. Inside air vents 12h are formed to penetrate the wall 12c and communicate with the motor chamber 11A, respectively, and the bottom wall 13c of the pump cover 13 is located axially below the outer peripheral edge of the bottom wall 12c on the lower surface 19b of each chamber 19. A plurality of outside air vents 13h communicating with the outside air are formed in the outer peripheral portion of each of the chambers. Even if the case 11 of the washer pump 10 receives water from all directions, water accumulates in each chamber 19, and furthermore, each inside air vent 12h Are formed radially inward of each of the outside air vents 13h to form a maze structure. It is possible to prevent the incoming reliably.

  Further, since the bottom wall 12c of the chamber upper surface 19a has an upper surface 12i formed on an inclined surface, even if water enters the motor chamber 11A, the water will be removed from the bottom wall 12c formed on the inclined surface. It is guided to the upper surface 12i of each of them, moves to each inside air vent 12h, and enters each chamber 19. Therefore, even if water enters the motor chamber 11A, the water is quickly discharged from the motor chamber 11A.

  Also, since the lower surface 19b of the chamber is formed as an inclined surface such that the distance from the upper surface 19a of the chamber increases as approaching the outer periphery of the bottom wall 12c, water accumulated in each chamber 19 is guided to the surface 19b formed by the chamber. It falls and is reliably discharged outside through each outside air vent 13h.

  According to the above-described embodiment, a half-cylindrical duct portion as an air passage is integrally formed in the filter body of the filter. However, a tubular ventilation pipe or the like is formed in the filter body to form an air passage. May be.

It is sectional drawing which follows the AA line in FIG. 3 which shows the washer pump of one Embodiment of this invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 3 is a bottom view of the washer pump. It is sectional drawing which follows the CC line in FIG. FIG. 3 is a vertical sectional view of a liquid suction port portion of the washer pump. It is a perspective view of a filter used for the above-mentioned washer pump. It is a front view of the above-mentioned filter. It is a rear view of the above-mentioned filter. It is a top view of the above-mentioned filter. It is a side view of the above-mentioned filter. It is a bottom view of the above-mentioned filter. It is explanatory drawing which shows the attachment state of the said washer pump. It is a side view which shows the principal part of the conventional washer pump by a cross section. FIG. 7 is a partial perspective view showing a cross section of a main part of the conventional washer pump.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Washer pump 16 Liquid suction port 30 Filter 31 Filter main body 32 Peripheral wall 33 Bottom wall 34 Duct part (air passage)
W Cleaning liquid (liquid)

Claims (2)

A filter used in the washer pump disposed in the liquid suction port in a washer pump having a cylindrical liquid suction port,
It is formed in a substantially cylindrical shape with a bottom, and has a mesh-like filtration portion on its peripheral wall and bottom wall. On a part of the peripheral wall, it is formed in a semi-cylindrical shape having a V-shaped cross section, and protrudes from the bottom wall. A filter for use in a washer pump, comprising a formed duct portion. It is a filter used for the washer pump of Claim 1, Comprising:
The filter used in a washer pump, wherein the mesh-shaped filtration part is not formed in the duct part.

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