JP6210428B2 - Impeller - Google Patents

Description

  The present invention relates to a pump impeller used for an outboard motor engine coolant pump, a bilge pump, and the like, and more particularly to a pump impeller that prevents wear and seizure damage of the impeller during dry operation and reduces torque. It is about.

2. Description of the Related Art Conventionally, pump impellers used in outboard engine cooling water pumps, pilge pumps, and the like have been shown in FIGS.
That is, the impeller 100 is configured to include a blade portion 110 made of a rubber-like elastic material that is rotatably held inside the pump housing 200 and elastically contacts the inner peripheral surface 210 of the housing 200.

  In this type of pump impeller, the water pumped up by the pump becomes a kind of lubricant in normal operation, so that seizure damage is unlikely to occur, but in dry operation where no lubricant is supplied, the pump casing rotates at high speed in the pump casing. Therefore, there has been a problem that the blade portion is damaged in a short time.

Further, in recent years, the demand for torque reduction has increased due to the influence of exhaust gas regulations and fuel efficiency thinking.
Under these circumstances, in models with excessive pump drainage, it is possible to reduce the torque by reducing the size of the impeller and reducing the pumping volume, but in models that cannot reduce the pumping volume. However, since such a response is not possible, there is a strong demand for reducing the torque with the current impeller size.

  In order to solve such problems, measures such as PTFE (tetrafluoroethylene resin) coating on the rubber surface of pump impellers made of rubber-like elastic material, oil application, and unevenness on the sliding surface are tried. However, (Patent Documents 1 and 2) have a problem that durability and durability are poor due to peeling of the PTFE coating film, reduction of applied oil, wear of unevenness, and the like.

  Furthermore, the oil is directly kneaded into the rubber material constituting the impeller for the pump, so that the impeller is made of so-called oil-impregnated rubber, the workability, and the bush that is inserted into the center of the impeller, There are also problems that the adhesiveness of the oil, the deterioration of the oil-containing oil, the molding failure of the pump impeller itself, and the like cannot be easily used.

JP 2011-21538 A Japanese Utility Model Publication No. 4-35594

  The present invention has been made in view of the above-described problems. By stably reducing the sliding resistance, the sliding surface of the impeller can be prevented from being worn and damaged, and the rotational torque can be reduced. Therefore, an object is to provide an impeller that can be expected to reduce power loss and improve fuel efficiency.

An impeller according to the present invention includes a resin-made bush rotatably held inside a pump housing, and a plurality of blade portions made of a rubber-like elastic material fixed to an outer peripheral surface of the resin-made bush. In addition, a rubber-like elasticity provided at both end portions in the axial direction of the resin material bush, and including a resin material plate portion fixed to the tip of the blade portion and in sliding contact with the inner peripheral surface of the pump housing An annular protrusion made of a material is in sliding contact with both side walls of the pump housing.

The present invention has the following effects.
According to the impeller of the first aspect of the present invention, the tip portion of the blade portion is provided with the resin material plate portion that is in sliding contact with the inner peripheral surface of the pump housing, and is annular at both axial end portions of the resin material bush. Protrusions are provided so that the sliding resistance can be stably reduced to prevent wear and damage to the sliding surface of the impeller and to reduce rotational torque, thus reducing power loss and fuel consumption. It can be improved.
According to the impeller of the second aspect of the present invention, a plurality of radially extending groove portions are formed at both axial end portions of the resin bush, and a part of the rubber-like elastic material constituting the blade portion enters the groove portion. Because of the configuration, the resin material bush and the rubber-like elastic material blade can be firmly joined.

  According to the impeller of the invention described in claim 3, since a through hole is provided in the resin material plate portion, and a part of the rubber-like elastic material constituting the blade portion enters into the through hole, the resin material The plate-making part and the rubber-like elastic material blade part can be firmly joined.

The top view which shows embodiment of this invention. AA sectional drawing of FIG. The side view which has arrange | positioned the impeller of FIG. 1 in the housing for pumps. The impeller top view which concerns on a prior art. BB sectional drawing of FIG. The side view which has arrange | positioned the impeller of FIG. 5 in the housing for pumps.

The best mode for carrying out the present invention will be described below with reference to the drawings.
<Embodiment>
1 to 3, an impeller 1 according to the present invention includes a resin bush 13 rotatably held in a pump housing 2 and a rubber-like member fixed to the outer peripheral surface of the resin bush 13. It has a basic configuration having a plurality of blade portions 11, 11 made of an elastic material.

And the resin-made board part 12 which slide-contacts with the internal peripheral surface 21 of the housing 2 for pumps is adhering to the front-end | tip part of these blade | wing parts 11 and 11. As shown in FIG.
In addition, annular protrusions 131 are configured to be in sliding contact with both side walls 22, 22 closing both sides of the cylindrical pump housing 2 at both axial ends of the resin bush 13.

  Thus, the sliding contact with the inner peripheral surface 21 of the pump housing 2 is not at the plurality of blade portions 11, 11 made of rubber-like elastic material but at the tip portions of the blade portions 11, 11. The provided resin material plate portion 12 can stably reduce sliding resistance over a long period of time, prevent wear and damage of the impeller sliding surface, and reduce rotational torque. Therefore, it is possible to reduce power loss and improve fuel efficiency.

  Furthermore, since the annular protrusions 131 provided at both axial ends of the resin bush 13 are in sliding contact with both side walls 22, 22 closing both sides of the cylindrical pump housing 2, the bush 13 Compared with the case where the rubber-like elastic material covering both axial ends of the two is in sliding contact with both side walls 22, 22, the sliding resistance can be further reduced, and positioning in the rubber mold is performed by the annular protrusion 131. Therefore, the pin for pressing the ring (bush 13), which had to be provided in the rubber mold, can be eliminated and can be produced at low cost.

  Further, as shown in FIG. 1, a plurality of (six) groove portions 132 extending radially are formed at both axial ends of the resin material bush 13, and a rubber-like structure constituting the blade portion 11 in the groove portion 132. A part of the elastic material enters.

As a result, the annular protrusions 131 provided at both ends in the axial direction of the resin bush 13 are cut at six positions on the circumference. In order to maintain the sealing performance, the cut annular protrusions 131 are cut off. A protrusion having the same shape as 131 is formed by a rubber-like elastic material constituting the blade portion 11, and the annular protrusion 131 is present without any break on the circumference.
With such a configuration, the resin material bush 13 and the rubber-like elastic material blade portion 11 can be firmly joined.

  Further, although not shown in the drawing, a through hole is provided in a region of the resin material plate portion 12 in contact with the blade portion 11 made of rubber-like elastic material, and the rubber-like elasticity constituting the blade portion 11 in the through hole. By adopting a configuration in which a part of the material enters, it is possible to firmly join the resin material plate portion 12 and the rubber-like elastic blade portion 11.

  The impeller 1 has a configuration in which a blade portion 11 made of a rubber-like elastic material such as chloroprene rubber (CR) or nitrile rubber (NBR) is integrally bonded to an outer peripheral surface of a resin material bush 13.

  The material of the resin material bush 13 and the resin material plate portion 12 is appropriately selected from a thermosetting resin and a thermoplastic resin, but a polyamide resin is preferably used from the viewpoint of sliding resistance and the like. .

  The impeller 1 rotates by inserting a rotating shaft (not shown) into the bush 13.

Further, as shown in FIG. 3, the impeller 1 is arranged so that the rotation center axis is eccentric with respect to the center axis of the housing 2 when the impeller 1 is arranged in the pump housing 2.
In FIG. 3, the center of the impeller 1 is located on the right side with respect to the central axis of the housing 2.

For this reason, the space surrounded by the right wings 11 and 11 and the inner peripheral surface 21 of the housing 2 is narrower than the space surrounded by the left wings 11 and 11 and the inner peripheral surface 21 of the housing 2,
The liquid existing in the space surrounded by the right blades 11 and 11 and the inner peripheral surface 21 of the housing 2 is compressed and forcibly discharged from a discharge port (not shown).

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  It is preferably used for a pump impeller used for an outboard engine cooling water pump, a bilge pump, or the like.

DESCRIPTION OF SYMBOLS 1 Impeller 2 Housing 11 Blade | wing part 12 Resin-made board part 13 Bush 21 Inner peripheral surface 22 Side wall 131 Annular protrusion 132 Groove part

Claims (3)

A resin-made bush (13) rotatably held inside the pump housing (2), and a plurality of blade portions made of rubber-like elastic material fixed to the outer peripheral surface of the resin-made bush (13) In the impeller (1) having (11), a resin plate portion (12) fixed to the tip of the blade (11) and in sliding contact with the inner peripheral surface (21) of the pump housing (2). ), And annular protrusions (131) made of rubber-like elastic material provided at both axial ends of the resin material bush (13) are in sliding contact with both side walls (22) of the pump housing (2). Impeller characterized by doing.   A plurality of radially extending groove portions (132) are formed at both axial end portions of the resin bush (13), and one of the rubber-like elastic materials constituting the blade portion (11) in the groove portion (132). The impeller according to claim 1, wherein the portion is inserted.   A through hole is provided in the resin plate portion (12), and a part of a rubber-like elastic material constituting the blade portion (11) is inserted into the through hole. The impeller described.

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