JPS5827898A - Fuel supply pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a fuel transfer pump of the type defined in the preamble of claim 1.

A type of pop-up in which the blades and wheel are made of synthetic resin is known. Although this impeller certainly has advantages in terms of manufacturing technology and the required wear resistance, if a synthetic resin with a low degree of expansion is used, the impeller
Problems arise due to large dimensional changes, especially in the radial direction, when exposed to the fuel to be transported.

Impellers made of metal are also known, which are of course only technically possible with zinc die-cast metal. However, these materials only meet the required wear resistance if they are provided with expensive surfaces that require post-processing, or if the wear points of the die-cast metal parts are combined with wear-resistant materials. I can do it.

On the other hand, the fuel transfer pump according to the present invention having the features set forth in claim 1 has the advantage of using a synthetic resin impeller, which is advantageous when forming an impeller ring which is difficult to manufacture. The disadvantages of this synthetic resin impeller, on the other hand, have the advantage that they do not need to be considered at all or occur only to the extent that they can be replaced.

Next, the configuration of the present invention will be specifically explained with reference to the embodiments shown in the drawings.

The transport bond 1o shown in FIG. 1 is attached to a casing 12 together with an electric drive motor (not shown). The conveying pump 1o has a chamber wall 14 on the suction side, which chamber wall 1 is equipped with a suction sleeve 16. Maintaining the distance from the chamber wall on the suction side, the middle 7 langes 1δ
is arranged, the intermediate 7 flange 18 forming the chamber wall on the pressure side. The two chamber walls 14, 18 are the intermediate ring 2
0, this intermediate ring 20 forms an annular chamber wall. In the transport chamber 22 thus formed, an impeller 24 as a blade member is rotatably arranged, and this impeller 24 forms the transport part of the transport pump. The impeller 24 is connected to a shaft 26 driven by an electric motor.
The shaft 26 is supported on the flange 18 in the middle. The impeller 2Φ has a base body 2δ made of a synthetic resin material with a low degree of expansion. The base body 2δ is provided with one vane 3130 .
32, the side channels 34, 36 of which are located opposite each other in adjacent chamber walls 14, 18. The impeller 24 has a bush 4o made of metal. This bushing 40 has, on its suction side facing the chamber wall, an annular boxwood 42 directed outwards. The tip of the boxwood 42 extends beyond the end face of the impeller 24 and thereby forms a support ring, via which the impeller 24 contacts the chamber wall 14 on the suction side. As a result, an axial gap is created in a simple manner between the chamber wall 14 on the suction side and the end face of the impeller 24 which is directed toward this chamber wall 14 . The axial gap between the wall of the intermediate flange 18 and the end face of the impeller 24 directed toward this wall is automatically provided by the width of the conveying chamber 22 . The dimensions of the transfer chamber 22 are as large as the protrusion of the impeller 24 formed by the boxwood 42.
It is larger than the width of 4. The bushing 40 arranged in the throat 38 of the impeller 24 is made of sheet metal or of border material. The bushing is preferably injection molded together with the basic body 28 of the impeller 24 as a plastic body. In order to form a good connection between the basic body 28 and the bushing 40, the bushing 40 is provided with an outwardly directed extension 43. The base body 28 of the impeller 24 is provided at its outer periphery with a ring 44 made of metal, which ring 44 has at least one protruding portion 45 directed inward to form a good connection with the base body 28. ing.

Like the bush 4o, the metal ring 44 is already fitted into an injection mold when manufacturing the impeller 24.

At this point, it has already been determined how much the collar 42 of the bushing 4o will protrude from the end face of the impeller. During the manufacturing process, the flow direction and thus the orientation of the filler material must be selected in such a way that dimensional changes due to expansion are minimal in the axial direction. Partially significant radial expansions are suppressed by a ring 44 made of metal. Dimensional changes due to expansion of the synthetic resin material occur only in the axial direction. In this axial direction the dimensional changes are tolerably small.

In the embodiment of the impeller 12.4 according to FIG. 2, the bushing 126 and the outer metal ring r128 are manufactured as a one-piece structural part 130 of sintered or die-cast metal. The structural portion 130 is
0 has a ring-shaped through hole 132 near the outer periphery. A strut 133 connects the outer region of the structural part 130 forming the bushing 126 to the outer metal ring 128 . Inside the ring-shaped through hole 132, one hole is inserted into each hole from the end surface side.
Two synthetic resin rings 134 and 136 are fitted, and these synthetic resin rings 134 and 136 are fitted with vane rings 138 and 136, respectively.
It has 140. The synthetic resin rings 134, 136 and the vane rings 138, 140 can be formed completely identically. The thickness of the synthetic resin rings 134, 136 is selected such that the surfaces facing each other contact each other after being fitted. Via this contacting surface, the two synthetic resin rings 134, 136 are ultrasonically bonded or glued together. The structural part 130 has a ring-shaped protrusion 144 on one end face 142, which protrusion 144 is similar to the boxwood 4 in the embodiment of FIG.
It has the same function as the protruding part 2.

The conveying pump according to the invention works as follows.

When the impeller 24 is driven via the shaft 26 , fuel is sucked in via the suction sleeve 16 and the suction opening 46 in the chamber wall 14 . The fuel then reaches the side channel 34 of the first pump stage and from there via an intermediate channel (not shown) into the inner ring channel 48 . Fuel is ring road 48
The flow passes through the impeller 24 through the through passage 50 and flows through the annular passage 5.
2 and then from the annular channel 52 via an intermediate channel, also not shown, the side channel 36 of the second pump stage. A pressure increase is obtained in this side channel 36 until the fuel flows out through the discharge opening 54 arranged in the intermediate 7 flange 1δ.

, The two examples 24 or 12 of the impeller are:
Ring 44 or 128 whose peripheral wall surface is made of metal
, so that the expansion of the structural member of the impeller made of synthetic resin is prevented in the radial direction. moreover,
A significantly cheaper manufacture of the impeller is easily possible. This is because the manufacturing technology advantages of using synthetic resin materials can be exploited without having to accept the disadvantages of synthetic resin expansion.

The motor section of the conveying pump is constructed, for example, in accordance with the embodiment described in US Pat. No. 4,134,712.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conveyance pump according to the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment of the impeller of the conveyance pump according to FIG.

Claims (1)

[Claims] 1. A pump for transporting fuel from a fuel tank to an internal combustion engine, comprising a transport member that rotates indoors,
The conveying member has at least one direction perpendicular to the direction of rotation.
In the type having a vane ring made of synthetic resin on one end surface, the conveying member (24 or 124) has a ring (44 or 124) made of metal on its peripheral wall surface.
8) A fuel transfer pump comprising: 2. The conveying member (24) has a slot hole, and this slot hole is covered with a bushing (40) made of metal;
A fuel transfer pump according to claim 1. 5. Fuel conveying pump according to claim 1, characterized in that the ring (44 or 12 δ) made of metal has at least one projection (45) directed inwardly. 3. Fuel conveying pump according to claim 2, characterized in that the bushing (40) made of metal is provided with at least one extension (43) directed towards the outside. 5. The metal bushing (40) faces outward. 3. Fuel conveying pump according to claim 2, characterized in that it has kerbed boxwood (42). 6. At least a part of the thickness of the boxwood (42) exceeds the end surface of the conveying member (24), claim 5.
Fuel conveyance 2 as described in Section 2. 7. The bush (40) is manufactured from a thin metal sheet,
A fuel transfer pump according to claim 2. 8. The bush (40) is the synthetic resin body of the impeller (24) (
2.delta.) The fuel transfer pump according to claim 2, wherein the fuel transfer pump is integrally molded with the fuel transfer pump. 9. The bush (126) and the ring (12δ) are integrally connected to each other, and the through hole formed in the end surface has a
Synthetic resin ring (1313, 140) with vane ring (1313, 140)
134, 136) are arranged, the fuel transfer pump according to claim 2. 10. The two sintered surfaces of the impeller (124) arranged opposite each other have a through hole for receiving a synthetic resin ring (134° 136) with a vane ring (13δ. 140). 10. The fuel transfer pump according to claim 9, wherein 11. The fuel transfer pump according to claim 10, wherein the two mutually facing radial surfaces of the synthetic resin rings (134, 136) are connected to each other. 12, a structural part (130) with a bush (126) and a ring (128)' is arranged on one end face (142) of the boss area.
10. Fuel transfer pump according to claim 9, further comprising a protrusion (144) formed integrally with the bushing (126) at a height of . 13. Fuel conveying pump according to claim 1, wherein the conveying pump (10) is constructed as a two-stage bypass pump. 14, the synthetic resin ring (134, 136) is inserted into the through hole (1
32) The fuel transfer pump according to claim 9, which is cast in the fuel transfer pump.