Transverse internal gear pump

Patent metadata

Field	Value
Publication number	US-2016348675-A1
Application number	US-201515117274-A
Country	US
Kind code	A1
Filing date	Jan 30, 2015
Priority date	Feb 6, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Provided is a transverse internal gear pump that can be manufactured at low cost, and also has a high safety factor in terms of functionality. This transverse internal gear pump 1 has a trochoid 4, in which an inner rotor 3 having a plurality of outer teeth is rotatably accommodated within an outer rotor 2 having a plurality of inner teeth, the inner rotor being rotatably accommodated within the outer rotor in an eccentric state and with the outer teeth and the inner teeth meshing, and in which an intake-side volume chamber for taking in a liquid and an ejection-side volume chamber for ejecting liquid taken into the intake-side volume chamber are formed between the inner teeth and the outer teeth; a liquid intake nozzle 9 extending in a non-perpendicular direction with respect to the trochoid rotation surfaces and having a distal end immersed in a liquid reservoir 18; a pump casing 5 in which a recessed portion 5 a for accommodating the trochoid is formed; and a pump cover 6 for closing off the recessed portion. An intake cover 8 that has the liquid intake nozzle 9 is secured to the pump casing 5, and the liquid intake nozzle 9 and the intake cover 8 are integrally molded by the injection molding of a resin composition.

First claim

1 . A transverse internal gear pump, comprising: a trochoid, in which an inner rotor having a plurality of outer teeth is rotatably accommodated within an outer rotor having a plurality of inner teeth, the inner rotor being rotatably accommodated within the outer rotor in an eccentric state and with the outer teeth and the inner teeth meshing, and in which an intake-side volume chamber for taking in a liquid and an ejection-side volume chamber for ejecting liquid taken into the intake-side volume chamber are formed between the inner teeth and the outer teeth; and a liquid intake nozzle extending in a non-perpendicular direction with respect to the trochoid rotation surfaces, the liquid intake nozzle having a distal end immersed in a liquid reservoir of the liquid, and forming part of a passage via which the liquid communicates with the intake-side volume chamber;
wherein the transverse internal gear pump is characterized by having a pump casing in which a recessed portion for accommodating the trochoid is formed, and a pump cover for closing off the recessed portion; an intake cover having the liquid intake nozzle being secured to either the pump casing or the pump cover, and the liquid intake nozzle and the intake cover being integrally molded by the injection molding of a resin composition.

2 . The transverse internal gear pump of claim 1 , characterized in that the intake cover, and the member to which the intake cover is secured, are arranged with portions thereof fitted together with a seal member interposed therebetween, and are secured using a retaining ring fitted therein so as to span the member and the intake cover.

3 . The transverse internal gear pump of claim 1 , characterized in that the intake cover, and the member to which the intake cover is secured, are arranged with portions thereof fitted together with a seal member interposed therebetween, and are secured using elastically deforming engaging portions provided to the member and the intake cover.

4 . The transverse internal gear pump of claim 1 , characterized in that a port linking the liquid intake nozzle interior and a space in the interior of the intake cover is disposed in a location that, when the pump is installed, is above a vertically central portion of the space in the interior of the intake cover.

5 . The transverse internal gear pump of claim 1 , characterized in that the resin composition is a resin composition in which a polyphenylene sulfide resin is used as a base resin, and at least one material selected from glass fibers, carbon fibers, and inorganic fillers is incorporated therein.

6 . The transverse internal gear pump of claim 1 , characterized in that the transverse internal gear pump is a pump for supplying the liquid to a sliding section of a scroll compressor.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Ishii Takuya
• Hattori Kei

Classifications

• F04C15/06 Primary

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C11/001

  of similar working principle · CPC title

• F04C2230/21

  by casting · CPC title

• F04C2230/60

  Assembly methods · CPC title

• F04C2/102 Primary

  the two members rotating simultaneously around their respective axes · CPC title