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Gear pump

A technology of gear pumps and gears, applied in pumps, rotary piston pumps, liquid fuel engines, etc., can solve the problems of shortened bearing life, damage, and increased driving force of the pump shape

Active Publication Date: 2008-02-27
岛津工业系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Moreover, the hazards of the above-mentioned confinement phenomenon are more significant when the viscosity of the fluid being transported or the suction pressure and discharge pressure are higher.
In particular, in applications such as pressure-feeding molten resins, in order to transport high-temperature fluids of about 300°C, high pressures of about 20MPaG, and high-viscosity fluids of about 300Pa·s, excessive loads are applied to gear bearings due to the confinement phenomenon. shorten bearing life
The current situation is to improve the bearing or make the bearing material sufficient (for example: increase the shaft diameter, reduce the rotation speed, etc.), which leads to the enlargement of the pump shape and the increase of the driving force.

Method used

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no. 1 Embodiment

[0029] The gear pump 100 of the first embodiment shown in Fig. 1 and Fig. 2 is, for example, in petroleum plants, chemical plants, polymerization plants, and molding / spinning devices, etc. Use for high viscous substances. The above-mentioned high viscous material can be an intermediate or a final product. The gear pump 100 is a so-called external gear pump. In the inner space contained by the casing 1, a driving gear 2 and a driven gear 3 are arranged in a meshing state. By rotating and driving these gears 2, 3, It functions as a pump that sends the fluid taken in between the teeth from the suction side to the discharge side. In fact, the suction side is located above and the discharge side is located below, and a storage tank for storing polymers or molten resins is provided directly above the suction port 11. The spit pressure spit out.

[0030] The driving gear 2 and the driven gear 3 are respectively set as herringbone gears with one point continuous contact tooth shape...

no. 2 Embodiment

[0049] 4 and 5 show a gear pump 500 of the second embodiment. This gear pump 500 is the same as the first embodiment, and is configured such that a driving gear 502 and a driven gear 503 are arranged in a meshing state in the inner space of the sleeve 1, and these gears 502, 503 are rotationally driven to exert The function of the pump that sends the fluid taken in between the teeth from the suction side to the discharge side.

[0050] The driving gear 502 and the driven gear 503 are helical gears with one-point continuous contact teeth. In the illustrated example, the tooth profiles of the two gears 502 and 503 are arc tooth profiles.

[0051] Here, generally speaking, the smaller the number of teeth of the gear pump, the higher the overall efficiency, and the smaller the outer diameter of the gear and the larger the tooth width, the higher the overall efficiency. Furthermore, the shaft diameter necessary to transmit the driving force, the shaft diameter when the shaft is b...

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Abstract

A gear pump that is more suitable for sending high-pressure, high-viscosity fluid such as melted resin. A gear pump (100) for sending fluid from the suction opening (11) side to the discharge opening (12) side by rotation of a pair of gears (2, 3) provided in a casing (1) and meshing with each other. The gears (2, 3) are double-helical gears having a one point continuous contact tooth profile, and for both gears (2, 3), a ratio D / B, or a ratio of a gear outer diameter D to a tooth width B, is set to in the range of 1.1 - 1.15. When D / B is below 1.1, a bearing load is excessive and the bearings may be damaged, causing the gears to be unsuitable for forcing of melted resin, etc. On the other hand, when D / B is above 1.15, the outer profile of the pump is larger and mechanical efficiency is reduced to lower the entire efficiency.

Description

technical field [0001] In particular, the present invention relates to a gear pump for conveying high-pressure, high-viscosity fluids. Background technique [0002] Most of the gear pumps that transport fluid from the suction side to the discharge side by the rotation of meshing gears adopt involute tooth shape. The reason is that the involute tooth profile is easy to cut, and the tooth profile processing size is easy to measure, so high-precision gears can be obtained, so it is also suitable for high-pressure operating conditions. [0003] [Patent Document 1] Japanese Patent Laid-Open No. 11-013642 [0004] As a problem in a gear pump using an involute tooth profile, a fluid suffocation phenomenon can be cited. It is common practice for an involute gear to have an engagement ratio greater than 1, and there is a period of engagement between two sets of teeth. In this case, fluid is trapped between the above two sets of teeth, and the volume of the confined area changes as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/18
CPCF04C2/16F04C13/002F04C2/084F04C2/18
Inventor 冈田元博
Owner 岛津工业系统有限公司