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gear pump

A technology of gear pumps and external gears, which is applied to pumps, pump components, rotary piston pumps, etc., and can solve problems such as the generation of external gears and pump casings, the increase in the current value of driving external gears, and the decrease in fluid self-priming performance

Active Publication Date: 2017-09-26
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the influence of dimensional accuracy in manufacturing the pump housing and / or the external gear, there are cases where the gap between the tooth tip of the external gear and the inner surface of the main body is locally too wide in the direction of the rotation center axis of the external gear. When the self-priming performance of the fluid is reduced
On the other hand, in the direction of the rotation center axis of the external gear, when the gap between the top of the tooth of the external gear and the inner surface of the main body part is too narrow to make contact, there may be a contact sound between the external gear and the pump casing, and / or Problems such as an increase in the current value driving the external gear due to the load on the contact part
In addition, when the tooth tops of the external gear contact with the inner surface of the main body because the gap is too narrow, the external gear may not be able to rotate.

Method used

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Experimental program
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no. 1 approach

[0062] the whole frame

[0063] 1( a ) and FIG. 1( b ) are explanatory views of a gear pump according to the first embodiment of the present invention, FIG. 1( a ) is a perspective view of the gear pump, and FIG. 1( b ) is an exploded perspective view of the gear pump. . 2( a ) and FIG. 2( b ) are explanatory views of the pump chamber of the gear pump according to the first embodiment of the present invention, FIG. 2( a ) is a bottom view of the pump chamber, and FIG. 2( b ) is a pump chamber. Sectional view of the interior. In addition, only a pump case and an external gear are shown in FIG.2(a) and FIG.2(b).

[0064] In Fig. 1(a), Fig. 1(b) and Fig. 2(a), Fig. 2(b), the gear pump 1 has a main body housing 2, a partition board 3 and a pump housing 4, through which the partition board 3 and the pump The housing 4 divides a pump chamber 10 . Two external gears 6 , 7 are disposed in the pump chamber 10 , and the two external gears 6 , 7 are rotatable about axes L6 , L7 paral...

no. 2 approach

[0081] 4( a ), FIG. 4( b ), and FIG. 4( c ) are explanatory diagrams of the external gears 6 and 7 used in the gear pump 1 according to the second embodiment of the present invention. 4(a) is a perspective view of the external gears 6, 7, FIG. In addition, since the basic configurations of the present embodiment, the third embodiment and the fourth embodiment described later are the same as those of the first embodiment, the same symbols are used for the common parts and descriptions of the common parts are omitted.

[0082] As shown in Fig. 4(a), Fig. 4(b), and Fig. 4(c), the external gears 6 and 7 used in this embodiment are resin molded parts and have cylindrical parts in which shaft holes 69 and 79 are formed. 68, 78, the radially outer parts 6b, 7b separated radially outward relative to the cylindrical parts 68, 78, and the connecting parts 63, 73 connecting the cylindrical parts 68, 78 and the radially outer parts 6b, 7b, and the external teeth 60 , 70 are formed on the...

no. 3 approach

[0086] 5( a ), FIG. 5( b ), and FIG. 5( c ) are explanatory diagrams of the external gears 6 and 7 used in the gear pump 1 according to the third embodiment of the present invention. 5(a) is a perspective view of the external gears 6, 7, FIG.

[0087] As shown in Fig. 5(a), Fig. 5(b), and Fig. 5(c), the external gears 6, 7 used in this embodiment are the same as those in the second embodiment, and have cylinders in which shaft holes 69, 79 are formed. 68 , 78 , radially outer portions 6 b , 7 b separated radially outward relative to the cylindrical portions 68 , 78 , and connection portions 63 , 73 connecting the cylindrical portions 68 , 78 and the radially outer portions 6 b , 7 b. Therefore, between the cylindrical portions 68, 78 of the external gears 6, 7 and the radially outer portions 6b, 7b, recessed portions 6c, 7c having the connection portions 63, 73 as bottoms and opening in the directions of the axes L6, L7 are formed.

[0088] In the present embodiment, a plural...

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Abstract

The present invention provides a gear pump capable of properly setting the distance between the inner surface of the main body of the pump casing that defines the pump chamber and the tooth top of the external gear. A gear pump includes a pump housing and two external gears, wherein the pump housing has a cylindrical main body portion that divides a pump chamber, and the two external gears rotate about axes parallel to each other in a state where the tooth tips are close to the inner surface of the main body portion . The addendum of the external gear and the inner surface of the main body portion of the pump housing are inclined relative to the axis toward a direction intersecting on the same side of the extending direction of the axis. Here, the pump housing is a resin molded part, and the tooth tops of the external gear and the inner surface of the main body of the pump housing are inclined relative to the axis in a direction intersecting toward the side where the bottom wall is located in the extending direction of the axis.

Description

technical field [0001] The present invention relates to a gear pump that sucks and discharges fluid through an external gear rotating in a pump chamber. Background technique [0002] In the gear pump, two external gears are rotated about axes parallel to each other in a pump chamber defined by the main body of the pump housing with the tooth tips close to the inner surface of the main body. As a result, since the fluid is conveyed in a state sealed by the teeth of the external gear and the inner surface of the main body, fluid can be sucked into and discharged from the pump chamber (see Patent Documents 1 and 2). Therefore, in the gear pump, it is necessary to reduce the gap between the addendum of the external gear and the inner surface of the main body. [0003] patent documents [0004] Patent Document 1: Japanese Unexamined Patent Publication No. 8-21371 [0005] Patent Document 2: JP-A-2002-48076 [0006] However, due to the influence of dimensional accuracy in manu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/18F04C15/00
Inventor 原田隆司
Owner SANKYO SEIKI MFG CO LTD