KR100748300B1 - Fuel transfering pump - Google Patents

Abstract

(Problem) The top and bottom dimensions can be reduced, and the yield on manufacturing is improved.

(Solution means) A pressure fuel connecting portion 11 to which a return passage for returning a part of the fuel sucked by the fuel pump in the tank to the tank or a passage for flowing surplus fuel when the pressure is adjusted downstream from the fuel pump in the tank is connected. And a negative pressure chamber (5) formed at a location including a nozzle (15) for discharging the fuel sent from the pressure fuel connecting portion (11) at the throat portion (15a) at the tip, and an outer circumference of the nozzle (15). And an introduction portion 2 communicating with the negative pressure chamber 5 and a central axis of the nozzle 15 and discharged from the introduction portion 2 to the negative pressure chamber 5 by the fuel discharged from the nozzle and the discharged fuel. In the fuel transfer pump 6 having the discharge part 3 for discharging the sucked fuel, the inlet part 2, the nozzle 15 and the discharge part 3 are located on the same central axis S, In addition, the passage portion 10a of the pressure fuel connecting portion 11 is connected to the introduction portion 2 through the bending passage portion 10b, Bla (15), is arranged around the direction orthogonal to the axis (S) of the outlet part (3).

Description

Fuel Transfer Pump {FUEL TRANSFERING PUMP}

1 is a front view and a right side cross-sectional view showing a fuel transfer pump of the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 (b) and a cross-sectional view taken along the line E-E of FIG. 2 (a).

3 is a cross-sectional view taken along the line B-B of FIG. 1 (a) and a cross-sectional view taken on the line D-D of FIG. 3 (a).

Fig. 4 is an enlarged view of the main part showing the relationship between the introduction tube and the main body along the cross section taken along the line C-C in Fig. 1B in a state before and after the introduction tube is mounted on the main body.

5 is an explanatory diagram showing a structure and a usage example of a fuel transfer pump disclosed in Patent Document 1;

Explanation of symbols on the main parts of the drawings

1-body 2-introduction pipe (corresponds to introduction department)

3-discharge pipe (equivalent to discharge part) 4-sealing member

5-negative pressure chamber 6-fuel transfer pump

10-passage 10a-passage

10b-Bend Passage 11-Pressure Fuel Connection

12-End 13-End

14-Part of the negative pressure chamber (groove) 14a-Groove (through hole)

15-nozzle 15a-throat

16-wall part (pathway wall partitioning the curved channel part)

17-opening 17a-small hole

17b-Large hole 18,19-Fitting groove

20-Introduction 21-End

24-through hole 25-regulatory

30-discharge passage 31-end

34-End space (part of negative pressure chamber) 23,33-Welding ribs

S-center axis

Patent Document 1: Japanese Patent Application Laid-Open No. 6-84760

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel transfer pump that is installed in a tank containing fuel and is suitable for transferring, for example, fuel in a poor compartment to a main chamber by an ejector (assist jet mechanism) action.

FIG. 5 shows a fuel transfer pump disclosed in Patent Literature 1, (a) is a longitudinal sectional view of the fuel transfer pump, and (b) shows an arrangement of the fuel transfer pump in the tank. In Fig. 5B, reference numeral 60 denotes a feed pump disposed in the tank 50, and reference numeral 62 denotes a fuel transfer pump for ejector. The tank 50 is a saddle type in which the main chamber 51 and the sub chamber 52 are blocked by the convex portion 53 at the bottom. The feed pump 60 is supported by the stay 55 at the bottom side of the main chamber 51, and supplies the fuel in the tank 50 to the fuel supply device at the engine side through the pipe 54. The fuel transfer pump 62 is a negative pressure chamber 65 which will be described later by using a classification when the surplus fuel in the fuel supplied to the fuel supply device by the feed pump 60 returns through the return pipe 56. ), The negative pressure is transferred, and the fuel in the sub chamber 52 is transferred to the main chamber 51 through the suction pipe 57.

In addition, the fuel transfer pump 62, as shown in Fig. 5 (a), the pressure fuel connecting portion 63 to which the return pipe 56 is connected, and the fuel sent from the pressure fuel connecting portion 63 of the tip A nozzle 64 discharged from the throat portion 64a, a negative pressure chamber 65 formed at a location including an outer circumference of the nozzle 64, an introduction portion 66 communicating with the negative pressure chamber 65, A discharge is formed on the central axis of the nozzle 64 and discharges the fuel sucked into the negative pressure chamber 65 through the introduction portion 66 and the suction pipe 57 by the fuel discharged from the nozzle and the discharged fuel. The part 67 is provided.

The main member is formed in the negative pressure chamber 65 and the negative pressure chamber 65 containing the nozzle 64 and the upper pressure plate 61A formed of the resin integrally forming the pressure fuel connecting portion 63 and the introduction portion 66. It consists of the resin lower plate 61B which integrally forms the communicating part 68 which reaches 65, and the discharge part 67 which continues below the negative pressure chamber 65. As shown in FIG. After the upper and lower plates 61A and 61B are joined by welding or the like, the end of the return pipe 56 is connected to the pressure fuel connecting portion 63 through the adapter 69a, and the suction portion 66 is sucked in. The end of the piping 57 for connection is connected via the adapter 69b.

In the fuel transfer pump 62 of the patent document 1, the pressure fuel connecting portion 63 and the introduction portion 66 protrude in parallel, and the pressure fuel connecting portion 63, the nozzle 64 and the discharge portion 67 have the same center. Since it is arranged on the axis, the height dimension becomes large and it is difficult to miniaturize. For example, the tank has a flat shape with a small vertical dimension, or a chamber or a reserve cup for accommodating the pump module in the tank. It is a problem when it is set inside. Moreover, in such a structure, since the engaging part of the upper plate 61A and the lower plate 61B arrange | positions the negative pressure chamber 65, the lower end of the nozzle 64, and the introduction part 66 inside the same direction, it is a surface. There is also a manufacturing problem, such as poor welding, and a central axis between the nozzle 64 and the discharge portion 67 is easily shifted.

Accordingly, the present invention has been made to solve the above problems, and its object is to reduce the size of the upper and lower dimensions, and to improve the manufacturing yield by the simple structure.

In order to achieve the above object, the present invention provides a return passage for returning a part of the fuel sucked by the fuel pump in the tank to the tank, or a passage for flowing surplus fuel when the pressure is adjusted downstream of the fuel pump in the tank. A pressure fuel connecting portion to be connected, a nozzle for discharging the fuel sent from the pressure fuel connecting portion from a throat portion at the distal end, a negative pressure chamber formed at a location including an outer circumference of the nozzle, and an introduction portion communicating with the negative pressure chamber; And a fuel discharge pump formed on a center axis of the nozzle and having a discharge portion for discharging the fuel discharged from the nozzle and the fuel sucked from the introduction portion into the negative pressure chamber by the discharged fuel. And the discharge portion are located on the same central axis, and the passage portion of the pressure fuel connecting portion is And characterized in that arranged in the introduction section, the nozzle, the direction in which the discharge portion through the central axis and orthogonal portion.

Moreover, in the above structure, the example in which the pressure fuel connection part is connected to the return passage which returns a part of fuel sucked up by the fuel pump in a tank to a tank is the structure of FIG. 4 of patent document 1, and is downstream of the fuel pump in a tank. Examples of the connection to the passage through which the surplus fuel flows when the pressure is adjusted may include the configuration of FIG. 5 of Patent Document 1. As shown in FIG.

Further, in the above-described invention, the pressure fuel connecting portion, the nozzle and a part of the negative pressure chamber are integrally formed, and a passage portion of the pressure fuel connecting portion communicates with the nozzle through the bending passage portion. An opening for lapping is formed in a passage wall portion located opposite to the throat portion of the nozzle in the curved passage portion toward the introduction passage side of the introduction portion, and the opening is sealed by a sealing member (claim) 2) The introduction portion is a through hole for communicating the introduction passage of the negative pressure chamber and the introduction portion with the pressure fuel connecting portion, the nozzle and the corresponding end portion of the introduction portion attached to the main body forming part of the negative pressure chamber. Together with a restraining portion for preventing movement of the sealing member in a disengagement direction (claim 3), the introduction portion and More preferably, the discharge portion is welded to both ends of the main fuel forming portion of the pressure fuel connecting portion, the nozzle, and the negative pressure chamber (claim 4).

<Embodiment of the invention>

Embodiment of this invention is described based on drawing. In this description, the structure of the fuel transfer pump will be described in detail, and then operation will be described.

(Structure of Fuel Transfer Pump)

The fuel transfer pump 6 of the present embodiment includes a main body 1, an introduction pipe 2 and an exhaust pipe 3 disposed on both sides of the main body 1, and a sealing member provided in the main body 1 ( It consists of 4). The main body 1, the introduction pipe 2, and the discharge pipe 3 are resin molded products such as polyacetal (POM), and the sealing member 4 is a rubber molded product such as acrylonitrile butadiene rubber (NBR). However, the sealing member 4 may be made of soft resin.

As shown in Figs. 2 to 4, the main body 1 is disposed at the end 12 and the other side to which the pressure fuel connecting portion 11 protruding upward and the introduction pipe 2 disposed on one side are coupled. An end 13 to which the discharge pipe 3 is coupled, an internal nozzle 15, and a portion 14 of the negative pressure chamber 5 are integrally formed. The passage 10 of the main body 1 is a passage portion 10a formed in the pressure fuel connecting portion 11 and a bent passage portion 10b for communicating the passage portion 10a and the nozzle 15 with each other. Is done.

The pressure fuel connection part 11 is a part corresponding to the pressure fuel connection part 63 of FIG. The passage portion 10a of the pressure fuel connecting portion 11 extends vertically from the upper side to the lower side and communicates with the nozzle 15 via the substantially L-shaped curved passage portion 10b. Among the passage wall portions partitioning the curved passage portion 10b, the wall portion 16 located in the opposite direction to the throat portion 15a of the nozzle 15 has a lapping opening 17 as shown in FIG. ) Is formed and sealed by the sealing member 4. That is, the opening part 17 is located on the center axis line of the nozzle 15, and the small diameter hole part 17a and the large diameter hole part of the outer side which are continuous with the inner periphery of the nozzle 15 ( 17b). The sealing member 4 has the shape which integrated the large diameter head part in the one end of the axial part, and the large diameter head part fits into the large diameter hole part 17b in the state in which the axial part was pushed into the small diameter hole part 17a.

The outer periphery of the edge part 12 and the edge part 13 has substantially circular shape. In the cross section of the end part 12, the cross section of the large diameter head part of the sealing member 4 is located in the center, and the fitting groove part 18 of the cross-sectional recessed shape is formed inward rather than the outer periphery. The nozzle 15 protrudes from the end surface of the end 13, and the groove 14 is formed on the outer circumference of the nozzle 15. The groove 14 constitutes a part of the negative pressure chamber 5 together with the end space 34 on the discharge pipe 3 side. Moreover, the groove part 14a which is a through hole which reaches the cross section of the edge part 12 is formed continuously in the inside of the groove part 14, and the cross section of the both ends 12 and 13 is formed in the groove part 14 and the groove part ( Communication is made through 14a).

The inlet pipe 2 has an end portion 21 coupled to the main body 1 side such that the introduction passage 20 and the nozzle 15 are located on the same central axis. In other words, the end portion 21 of the introduction pipe 2 has a substantially truncated cone shape. On the cross-sectional side of the edge part 21, as shown in FIG. 4, the substantially circular welding rib 23 which protrudes slightly inward from the outer periphery, the convex regulating part 25 which protruded outward from the center, and a cross section The through hole 24 which cuts out part of and penetrates inside and outside is formed.

The inlet pipe 2 described above is fitted to the fitting groove 18 for the fitting rib 23 with respect to the end portion 12 of the main body 1, and is used for welding in a state where the rotational direction is restricted. Combined by In the engaged state, the restricting portion 25 approaches the sealing member 4 to prevent movement of the sealing member 4 in the disengagement direction.

The discharge pipe 3 has an end 31 coupled to the main body 1 side such that the discharge passage 30 and the nozzle 15 are located on the same central axis. That is, the end part 31 of the discharge pipe 3 is substantially conical-shaped. An end space 34 and an approximately circular welding rib 33 protruding slightly inward from the outer circumference are formed on the end face side of the end 31. The end space 34 constitutes a part of the negative pressure chamber 5 together with the groove 14 on the end 13 side.

The discharge pipe 3 described above is fitted to the fitting groove 19 for the fitting rib 33 with respect to the end 13 of the main body 1, and is adapted for spin welding in a state where the rotational direction is regulated. Since the discharge pipe 3 and the nozzle 15 are coupled to each other, the discharge pipe 3 and the nozzle 15 are accurately coupled on the same center axis line without shifting.

As described above, in the combined state in which the introduction pipe 2 and the discharge pipe 3 are respectively coupled to both ends 12 and 13 of the main body 1, that is, in the state where the fuel transfer pump 1 is completed, The introduction passage 20 of the pipe 2 and the discharge passage 30 of the nozzle 15 and the discharge pipe 3 are located on the same central axis S, and the passage portion of the pressure fuel connecting portion 11 ( 10a) is arrange | positioned in the direction substantially orthogonal to axis line S through the bending channel | path part 10b.

Therefore, the above-described fuel transfer pump 6 can be flattened by suppressing the upper and lower dimensions compared with the fuel transfer pump 62 of Patent Document 1, and as a result, it is arranged in a flat-shaped tank, or in various chambers in the tank. The arrangement in a narrow space such as in a reserve cup does not cause a problem. In addition, since the introduction pipe 2 and the discharge pipe 3 are welded to the both ends 12 and 13 of the main body 1 structurally, the welding location increases compared with the thing of patent document 1, However, these welding locations Since all are in the shape of a relatively small pipe, poor welding is unlikely to occur, and thus the yield in manufacturing can be improved.

(work)

The above-described fuel transfer pump 6 is installed in the tank 50 containing fuel similarly to the conventional product of FIG. 5, for example, when the fuel of the inferior chamber 52 is transferred to the main chamber 51 by the ejector action. Apply. Therefore, the case where the fuel transfer pump 6 of this embodiment is used instead of the fuel transfer pump 62 of FIG. 5 is demonstrated as an example.

The fuel transfer pump 6 is connected to the pressure fuel connecting portion 11 of the main body 1 by an end of the return pipe 56 of FIG. 5 directly or through an adapter, or the like. The end of the suction pipe 57 of 5 is connected directly or through an adapter or the like. In addition, an extension pipe is connected to the discharge pipe 3 as necessary.

In the structure of the fuel transfer pump 6, for example, the surplus fuel in the fuel supplied to the fuel supply device on the engine side by the feed pump 60 of FIG. 5 is pressurized with the return pipe 56. Through the passage portion 10a (arrow L1 in FIG. 2) and the curved passage portion 10b of the fuel connecting portion 11, the nozzle 15 flows out from the nozzle 15 toward the discharge passage 30 of the discharge pipe 3 ( Arrow L3 in FIG. 2). In this case, the negative pressure chamber 5 is negatively pressured by the injection of the surplus fuel. As a result, due to the negative pressure, the fuel in the subsidiary chamber 52 is introduced into the introduction passage 20 (arrow L2 in FIG. 2) of the suction pipe 57 and the introduction pipe 2 and the groove portion of the main body 1. 14a) and the groove portion 14, together with the surplus fuel injected from the nozzle 15 is transferred from the discharge passage 30 of the discharge pipe 3 to the main chamber 51 (arrow L3 in FIG. 2).

The above embodiment does not restrict the present invention at all. The present invention can be variously modified on the basis of this embodiment, except for specific requirements in claim 1. For example, although the main body 1, the introduction pipe 2, and the discharge pipe 3 were couple | bonded by spin welding in embodiment, it is not limited to this, It can combine by other methods, such as an ultrasonic welding or a hot plate welding. . Instead of the press-fit type of the present embodiment, the sealing member 4 is attached to a 본체 -shaped main body molded of resin such as polyacetal to be fitted into the opening 17 of the main body 1, and to the outer circumference of the small diameter portion of the main body. It may consist of O-rings of one soft resin.

As can be seen from the comparison between Fig. 2 and Fig. 5 (a), the invention of claim 1 is provided with the introduction portion, the nozzle, and the discharge portion on the same central axis, and the passage portion of the pressure fuel connecting portion is connected through the bending passage portion. Since it is disposed in a direction orthogonal to the direction, the upper and lower dimensions can be reduced, and thus it is applicable to the arrangement in a flat tank or in various chambers or reserve cups in the tank, thereby expanding its use. Can be tried.

In the invention of claim 2, the pressure fuel connecting portion and the nozzle are arranged in such a manner that the introduction portion, the nozzle, and the discharge portion are positioned on the same central axis, and the passage portion of the pressure fuel connecting portion is arranged in a direction substantially orthogonal to the axis through the curved passage portion. When the main body forming part of the overpressure chamber is resin-molded so as to have a shape as shown in Fig. 2, it can be manufactured in the simplest configuration by setting the opening and the sealing member. This point is that, for example, if the nozzle is attached after the sealing member is formed integrally with the main body, the nozzle should be joined by screwing or welding. Precision to be located on the center axis is required and cannot be manufactured simply.

In the invention of claim 3, as an advantage of preventing the sealing member from being pulled out by the restricting portion on the side of the introduction portion in the state where the introduction portion is mounted on the main body, it is easy to simplify the attachment structure of the sealing member to the opening and to seal the Since the member does not need to have a fall prevention force, a material having any hardness that can maintain the sealing property can be selected. This is because, for example, even if the sealing member is made of rubber and the press-fitting method is adopted for the opening, the possibility of the sealing member falling off can be solved by the restricting unit.

In the invention of claim 4, the introduction portion must also be welded to the main body as compared with Patent Literature 1, but since both the introduction portion and the discharge portion have a simple shape, the welding operation is simplified and the production yield can be improved. In addition, since the sealing member is only prevented from being pulled out by the restricting portion, the deviation of the central axis in the coupling between the main body and the inlet portion does not affect the sealability of the sealing member.

Claims (4)

A pressure fuel connection portion to which a return passage for returning a portion of the fuel sucked up by the fuel pump in the tank to the tank or a passage for flowing surplus fuel when the pressure is adjusted downstream from the fuel pump in the tank is connected; A nozzle for discharging the fuel to be discharged from the throat portion at the distal end, a negative pressure chamber formed at a location including an outer circumference of the nozzle, an introduction portion communicating with the negative pressure chamber, and formed on a central axis of the nozzle. A fuel transfer pump having a fuel discharged from and a discharge portion for discharging fuel sucked from the introduction portion into the negative pressure chamber by the discharged fuel, The introduction portion, the nozzle and the discharge portion are located on the same central axis, and the passage portion of the pressure fuel connecting portion is arranged in a direction orthogonal to the central axis line of the introduction portion, the nozzle, and the discharge portion through a curved passage portion. Fuel transfer pump. The method according to claim 1, The pressure fuel connecting portion, the nozzle, and a part of the negative pressure chamber are integrally formed, and a passage portion of the pressure fuel connecting portion communicates with the nozzle through the bending passage portion, and in the bending passage portion, A fuel transfer pump, characterized in that an opening for wrapping is formed in a passage wall portion located opposite to the throat portion of the nozzle toward the introduction passage side of the introduction portion, and the opening is sealed by a sealing member. The method according to claim 2, The introduction portion is provided with a through hole for communicating the introduction passage of the negative pressure chamber and the introduction portion with the pressure fuel connecting portion, the nozzle and the corresponding end portion of the introduction portion attached to the main body forming a part of the negative pressure chamber. A fuel transfer pump having a restricting portion for preventing movement of the sealing member in a disengagement direction. The method according to any one of claims 1 to 3, And the introduction portion and the discharge portion are welded to both end portions of the main body forming the pressure fuel connecting portion, the nozzle, and the negative pressure chamber, respectively.

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