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Electric fuel pump

A fuel pump and electric technology, applied to liquid fuel feeders, pumps, circulation pumps, etc., can solve problems such as increased power consumption, increased rotational frictional resistance of the impeller 1, and reduced rotational speed of the motor unit 12

Inactive Publication Date: 2003-11-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the contact between the pump casing 7 and the impeller 1 still occurs at the part where the contact relief part 2b of the cut-off part 2a-1 is not provided. also increases, so there is a problem that the discharge efficiency of the electric fuel pump decreases

Method used

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  • Electric fuel pump
  • Electric fuel pump
  • Electric fuel pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 It is a partially cutaway side view showing the electric fuel pump according to Embodiment 1 of the present invention. figure 2 is along figure 1 Sectional view of the pump cover seen on line II-II. image 3 is along figure 2 Enlarged cross-sectional view of line III-III. Figure 4 It is an explanatory diagram showing the effect of the stepped side wall of the pump cover. In the figure, 1, 1a, 3, 4 to 6, 6a, 8 to 14 are the same as the above-mentioned conventional devices, and their descriptions are omitted.

[0034] 16 is a pump cover, which has a sliding surface 16a facing one side surface 1b of the impeller 1 with a slight gap and supporting the impeller 1 . In the vicinity of the side 6a of the sliding surface 16a opposite to the pump chamber outlet 6, a gap that communicates with the inner side wall 4a on the inner peripheral side of the pump chamber 4 and is larger than the small gap between the impeller 1 and the sliding surface 16a is formed. ...

Embodiment 2

[0040] Figure 5 It is a plan view showing a pump cover according to Embodiment 2 of the present invention. Figure 6 is along Figure 5 The enlarged sectional view of line VI-VI in the center. Figure 7 is along Figure 5 The enlarged cross-sectional view of line VII-VII in the middle. In the figure, 4, 5, 6a, 16, 16a, 18 are the same as those in Embodiment 1, and their descriptions are omitted.

[0041] In the vicinity of the side 6a of the sliding surface 16a of the pump cover 16 constituting the pump casing 17, which is opposite to the pump chamber outlet 6, a small gap is formed which communicates with the inner side wall 4a on the inner peripheral side of the pump chamber 4 and is smaller than the impeller 1 and the sliding surface 16a. Larger gap, so that the gap is made as the contact relief portion 20 opposite to the impeller 1, at the end 21 of the contact relief portion 20, that is, at the position opposite to the rotation direction 18 of the impeller 1 ( Figu...

Embodiment 3

[0044] Figure 8 It is a plan view showing a pump cover according to Embodiment 2 of the present invention. Figure 9 is along Figure 8 Enlarged cross-sectional view of the line IX-IX in the middle. In the figure, 4, 5, 6a, 16, 16a, 16b, 16c, 18, and 19 are the same as those in Embodiment 1, and their descriptions are omitted.

[0045] On the sliding surface 16a of the pump cover 16 constituting the pump casing 17, in addition to the contact relief portion 16b shown in Embodiment 1, an inner portion on the inner peripheral side of the pump chamber 4 is formed in the vicinity of the fuel suction port 5 of the sliding surface 16a. The side wall 4a communicates with the gap portion 30 that is larger than the tiny gap between the impeller 1 and the sliding surface 16a. At the downstream end portion 31 of the fuel flow direction of the starting end portion 4b of the pump chamber 4 of the gap portion 30, that is, between the impeller and the impeller. 1 rotation direction 18 rel...

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Abstract

An electric fuel pump provided on a pump casing supporting an impeller by a sliding surface of a pump seat and a sliding surface of a pump cover, and formed on the peripheral side of the pump chamber near the side opposite to the pump chamber outlet of the pump cover sliding surface The contact relief portion with the clearance larger than the small gap between the impeller and the sliding surface, a stepped side wall is formed at the downstream end of the contact relief portion on the side opposite to the pump chamber outlet, and the inclination angle of the stepped side wall is between 90 degrees and 90 degrees. Between 135 degrees, the fuel pump can reduce the frictional resistance between the pump casing and the impeller, prevent the reduction of the motor speed and the increase in power consumption, and improve the discharge efficiency.

Description

technical field [0001] The present invention relates to an inner tank type electric fuel pump installed in a fuel tank of an automobile and the like to pressurize fuel to an engine. Background technique [0002] Figure 14 It is a partially cutaway side view of a conventional electric fuel pump disclosed in Japanese Invention Publication No. 187382 in 1993. Figure 15 is along Figure 14 Sectional view of line XV-XV in middle. Figure 16 yes yes along Figure 15 Sectional view of XVI-XVI line. Figure 17 It is a top view of a pump cover that is not provided with a contact relief part (when り escape し part) for reference. [0003] In the figure, 1 is a disk-shaped impeller with a plurality of impeller grooves 1a radially formed on the outer peripheral edge, and 2 is a pump cover that faces one side 1b of the impeller 1 with a small gap and has a sliding surface 2a that supports the impeller 1. , 3 is a pump base with a small gap opposite to the other side 1c of the impell...

Claims

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Application Information

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IPC IPC(8): F02M37/10F02M37/04F04D5/00
CPCF02M37/048F04D5/002F05B2250/503F04D5/007
Inventor 吉冈浩
Owner MITSUBISHI ELECTRIC CORP
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