Jet pump device and fuel supply system comprising same

Abstract

The utility model provides a jet pump device which comprises a pump shell (1), the pump shell comprises a main body section (10) with a first end (11) and a second end (12), the main body section defines a main body cavity, and the main body cavity comprises a pressure sealing area (12) close to the first end; a fuel inlet section (2) extending from the first end of the body section defining a fuel inlet passage (20) having an inlet port leading to the body chamber; the jet flow nozzle is located on the downstream of the fuel inlet channel in the main body cavity in the fuel flowing direction; and a distal suction section extending from the body section defining a distal suction channel, the distal suction channel having a suction port facing the jet nozzle; wherein the pressure sealing area comprises a plugging piece, the plugging piece comprises a plugging part and a filter screen part, and the plugging piece is arranged to enable fuel from the fuel inlet channel to enter the jet flow nozzle after being filtered by the filter screen part.

Description

TECHNICAL FIELD

[0001] The utility model relates to ejector pump technical field especially, it relates to a kind of plugging piece's ejector pump device with filter screen. BACKGROUND

[0002] Ejector pump is also called jet pump, it uses liquid with certain pressure as working liquid to inject or suck liquid with lower pressure or no pressure, is widely used in various fluid equipment, for example, is used in the fuel supply system of automobile, to inject the fuel of oil tank bottom.

[0003] In the application occasion of automobile oil tank, ejector pump is usually cooperated with oil pump for pumping fuel from oil tank to engine. Specifically, ejector pump is arranged at the bottom of oil tank, receives pressurized fuel from oil pump branch or return oil pipeline to be working liquid, and sucks the fuel of oil tank bottom to oil pump or oil storage barrel where oil pump is located, so that the fuel in oil tank can be pumped by oil pump when the liquid level of fuel, i.e. oil level, is very low. In particular, in some types of automobile, such as four-wheel drive automobile, the oil tank is usually saddle-shaped oil tank including main oil tank and auxiliary oil tank. For this kind of oil tank, ejector pump is usually arranged in main oil tank and auxiliary oil tank.

[0004] The shell of existing ejector pump is generally formed by injection molding, and there is a process hole near the oil inlet channel of ejector pump. In order to maintain the system pressure of ejector pump, a plugging piece such as steel ball is press-fitted in the process hole above the nozzle of ejector pump during assembly, and then hot riveting process is used to ensure the sealing of steel ball and plastic shell, while preventing the steel ball from falling off.

[0005] However, due to the design of current structure without filtering device, if impurities enter together with fuel from the oil inlet pipe of ejector pump during the operation of oil pump, the nozzle will be blocked, which will cause the ejector pump to fail to work normally, and further cause the gasoline on one side of saddle-shaped oil tank auxiliary pump to be unable to be pumped out to engine end, resulting in abnormal failure of low oil pressure and engine stall during driving of automobile. UTILITY MODEL CONTENTS

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide an ejector pump device, which comprises a plugging piece with filtering structure, so as to significantly reduce the situation that nozzle is blocked by impurities, and the assembly process of such plugging piece is simple, and the production cost is low.

[0007] Therefore, the ejector pump device provided by the utility model has the advantages that the plugging piece is provided with the plugging part and the filter screen part, the plugging function of the steel ball in the prior art is integrated, the filter screen function which is not provided in the prior art is added, and the situation that the jet nozzle is blocked by impurities is obviously reduced. Moreover, the plugging piece is assembled by interference fit, so that the assembly process is simple, and the part cost of the steel ball and the process cost of hot riveting are saved.

[0008] In the ejector pump device, by providing the plugging piece comprising the plugging part and the filter screen part, on one hand, the hot riveting plugging function of the steel ball in the prior art is integrated, and on the other hand, the filter screen function which is not provided in the prior art is added, and the situation that the jet nozzle is blocked by impurities is obviously reduced. Moreover, the plugging piece is assembled by interference fit, so that the assembly process is simple, and the part cost of the steel ball and the process cost of hot riveting are saved.

[0009] In one preferred embodiment of the utility model, the first end of the main body section of the pump housing is provided with a process hole, and the plugging piece is press-fitted into the pressure closed area through the process hole, wherein the plugging part is configured as a cylinder with a first diameter, and the process hole is a circular hole with a second diameter, the first diameter is greater than the second diameter, so that the plugging part can be interference-fitted with the process hole. By replacing the hot riveting process in the prior art with interference fit, the assembly time can be significantly reduced.

[0010] According to one preferred embodiment of the utility model, the plugging part has a first end face and an opposite second end face, and the plugging part has a limiting part extending from the first end face; the first end of the main body section has two diametrically opposite protruding parts extending perpendicularly to the end face of the first end, and each protruding part is provided with an opening for receiving the limiting part.

[0011] Since the working pressure of the ejector pump device is high, and the fluid pressure is washed for a long time, in order to further prevent the displacement of the plugging piece and avoid the failure to maintain the pressure in the system, in one preferred embodiment, the plugging part has a first end face and an opposite second end face, and the plugging part has a limiting structure extending from the first end face, and the first end of the main body section is provided with a corresponding stop structure, and the displacement of the plugging piece in the process hole is further prevented by the cooperation of the limiting structure and the stop structure.

[0012] In one scheme of the utility model, the limiting structure includes a rectangular body extending from the first end face and two buckle parts extending outwardly and obliquely from the end of the rectangular body, and the two buckle parts are symmetrical about the central axis of the plugging part; the stop structure includes two diametrically opposite protruding parts extending perpendicularly to the end face of the first end and a hole provided in each protruding part for receiving the buckle part. This buckle type mechanical connection is very firm, and can further ensure that the plugging member is firmly assembled in the process hole.

[0013] In one preferred scheme of the utility model, the filter screen part of the plugging member includes a cylindrical filter screen extending from the second end face of the plugging part and a cylindrical support section extending from the cylindrical filter screen, wherein the mesh size of the cylindrical filter screen is smaller than the orifice size of the jet nozzle. Wherein, the plugging part and the filter screen part are integrally formed by injection molding process from a plastic material such as POM material.

[0014] In one scheme, the distal suction section and the fuel entry section are located on opposite sides of the main body section.

[0015] According to one scheme of the utility model, the main body chamber further includes a mixing section and a diffusion section located downstream of the jet nozzle in the fuel flow direction, wherein the jet nozzle, the mixing section and the diffusion section are arranged along a straight line.

[0016] The utility model also provides a fuel supply system, including the oil tank for containing fuel, the oil pump and the ejector pump device associated with the oil pump are set in the oil tank.

[0017] The utility model discloses an ejector pump device, which comprises a main body section, a fuel entry section and a distal suction section, wherein the fuel entry section is arranged on one side of the main body section, and the distal suction section is arranged on the other side of the main body section. BRIEF DESCRIPTION OF DRAWINGS

[0018] The features and advantages of the utility model will be clearly understood through the following detailed description with reference to the accompanying drawings. It should be understood that the following drawings are only schematic and not necessarily drawn to scale, and therefore should not be considered as limiting the utility model, wherein:

[0019] Figure 1 A perspective view of one embodiment of the ejector pump device according to the utility model is shown;

[0020] Figure 2 A perspective view of one embodiment of the ejector pump device according to the utility model is shown;Figure 1 a cross-sectional view of the ejector pump device shown;

[0021] Figure 3 a perspective view showing one embodiment of the plugging member with a filtering structure according to the present utility model; and

[0022] Figure 4 To Figure 3 a cross-sectional view of the plugging member shown. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present utility model are described in detail below. The exemplary embodiments described below and shown in the drawings are intended to teach the principles of the present utility model so that those skilled in the art are capable of implementing and using the present utility model in a number of different environments and for a number of different applications. Accordingly, the exemplary embodiments are not intended to and should not be construed to limit the scope of protection of the present utility model. Rather, the scope of protection of the present utility model is defined by the appended claims.

[0024] Figure 1 a perspective view showing one embodiment of the ejector pump device 100 according to the present utility model. Figure 2 a cross-sectional view of the ejector pump device 100.

[0025] As can be seen from the drawings, in this embodiment, the ejector pump device 100 has a pump housing 1 which comprises a main section 10 having a first end 11 and an opposite second end 12, a fuel entry section 2 extending from the first end 11 of the main section 10, a jet nozzle 3 and a distal suction section (also referred to as distal oil suction section) extending from the other side of the main section 10. The pump housing 1 is integrally formed by injection molding process from a plastic material, for example, POM material.

[0026] Referring to Figure 2 , the main section 10 defines a main chamber extending between the first and second ends, the first end 11 being provided with a process hole 110, the main chamber including a pressure closed area 13 proximate to the first end, in particular, proximate to the process hole. The fuel entry section 2 defines a fuel entry passage 20 having an entry port 21 opening into the main chamber. The jet nozzle 3 is located within the main chamber and downstream of the fuel entry passage 20 in the fuel flow direction. The distal suction section 4 defines a distal suction passage 40 having a suction port 41 facing the jet nozzle 3, i.e., the suction port 41 is arranged proximate to the jet nozzle 3. The main chamber further includes a mixing section 6 and a diffusion section 7 downstream of the jet nozzle 3 in the fuel flow direction, wherein the jet nozzle 3, the mixing section 6 and the diffusion section 7 are arranged in line.

[0027] Advantageously, the closure 5 is press-fitted at the pressure-tight region 13. See Figure 3 The closure comprises a closure portion 51 and a filter portion 52, and is arranged such that the filter portion 52 is proximate to the inlet port 21 of the fuel inlet passage 20, so that fuel from the fuel inlet passage 20 passes through the filter portion before entering the jet nozzle 3. This significantly reduces the likelihood of the nozzle becoming clogged with impurities. In this embodiment, the closure 5, i.e. the closure portion and the filter portion, are integrally formed by injection moulding from a plastics material, such as POM. The mould design for such a closure is simple, and the part cost is low.

[0028] In the above embodiment, the closure 5 is press-fitted into the pressure-tight region 13 via the process hole 110. In a preferred embodiment, the closure portion 51 is configured as a cylinder having a first diameter, and the process hole 110 is a circular hole having a second diameter, the first diameter being slightly larger than the second diameter, so that the closure portion can be press-fitted into the process hole. It will be appreciated that the closure portion and the process hole can also be configured in other shapes, as long as they can be press-fitted, and are encompassed within the scope of the present application.

[0029] In a particular embodiment, see Figure 3 and Figure 4 , the cylindrical closure portion 51 has a first end face 511 and an opposite second end face 512, and the closure comprises a limiting structure 53 extending from the first end face of the closure portion, and the first end of the body portion is provided with a corresponding stop structure, and by cooperation of the limiting structure and the stop structure, the displacement of the closure 5 in the process hole 110 can be further prevented. The cooperation of the stop structure and the limiting structure can provide a resistance to the closure in the opposite direction of the pressure from the driving fuel, so as to prevent the outward displacement of the closure in the process hole under the long-term fuel pressure flushing.

[0030] In a preferred embodiment, the limiting structure 53 comprises a rectangular body 531 extending from the first end face 511, and two clamping portions 532 extending outwardly and obliquely from the ends of the rectangular body, and the two clamping portions are symmetrical about the central axis of the closure portion 51. Correspondingly, the stop structure comprises two diametrically opposite protrusions 111, such as arc-shaped protrusions, extending perpendicularly from the end face of the first end, and an opening 112 (see Figure 1 ) provided in each protrusion for receiving the clamping portions 532, respectively. The oblique structure of the clamping portions makes the closure 5 easily press-fitted into the process hole 110 by press-fitting. The snap-fit cooperation of the clamping portions and the openings can provide a more secure mechanical connection to ensure that the closure is more securely located in the process hole.

[0031] In a preferred embodiment, the filter section 52 comprises a cylindrical filter screen 521 extending from the second end face 512 of the obturator 51 and a cylindrical support section 522 extending from the cylindrical filter screen. The orifice size of the jet nozzle is typically 0.5 mm, wherein the mesh size of the cylindrical filter screen is smaller than the orifice size of the jet nozzle to facilitate filtering of impurities in the fuel. In this example, as can be seen from the figures, the outer diameter of the cylindrical support section 522 can be equal to the first diameter of the obturator 51, such that the outer peripheral surface of the cylindrical support section can abut against the inner peripheral surface of the main body chamber when the obturator is fitted in the pressure-tight region 13. The outer diameter of the cylindrical filter screen 521 can be slightly smaller than the first diameter.

[0032] In an embodiment of the application, a fuel supply system is also provided, which comprises a fuel tank for containing fuel, an oil pump arranged in the fuel tank and an ejector pump device associated with the oil pump. The fuel tank is configured as a saddle tank comprising a main tank and a sub tank, wherein an oil reservoir can be arranged in the main tank, and the oil pump can be arranged in the oil reservoir. In operation, when the fuel tank, in particular the main tank, contains sufficient fuel, the fuel can enter the oil reservoir, be sucked in by the oil pump via the filter screen and be supplied to the engine via the fuel supply line. In order to still be able to pump fuel to the engine when the fuel level in the main tank is low, the ejector pump device is arranged at the bottom of the oil reservoir. The fuel inlet passage of the ejector pump device can lead to the main tank space outside the oil reservoir, and the discharge outlet downstream of the diffuser section of the ejector pump device opens into the oil reservoir or leads to the oil pump, so that the low fuel level in the main tank can be injected into the oil reservoir or the oil pump, so that the fuel can be pumped to the engine.

[0033] It should be noted that the above description is only exemplary, and those skilled in the art can make various modifications and variations to the embodiments of the application according to the above description, and these modifications and variations are all within the protection scope of the application.

Claims

1. An ejector pump apparatus, characterized by, The ejector pump device (100) comprises a pump housing (1), wherein the pump housing comprises: a main body section (10) having a first end (11) and an opposite second end (12), the main body section defining a main body chamber extending between the first end and the second end, the main body chamber comprising a pressure closed area (13) proximate to the first end; a fuel inlet section (2) extending from the first end (11) of the main body section, the fuel inlet section defining a fuel inlet passage (20) having an inlet port (21) opening into the main body chamber; a jet nozzle (3) within the main body chamber downstream of the fuel inlet passage (20) in a fuel flow direction; and a distal suction section (4) extending from the main body section, the distal suction section defining a distal suction passage (40) having a suction port (41) facing the jet nozzle; wherein the pressure closed area (12) comprises a closure member (5) comprising a closure portion (51) and a screen portion (52), the closure member being arranged such that fuel from the fuel inlet passage (20) enters the jet nozzle (3) after being filtered through the screen portion.

2. The ejector pump apparatus of claim 1, wherein The first end is provided with a process hole (110) through which the closure member is press-fitted into the pressure closed area, wherein the closure portion is configured as a cylinder having a first diameter, and the process hole is a circular hole having a second diameter, the first diameter being greater than the second diameter, so that the closure portion is in interference fit with the process hole.

3. The ejector pump apparatus of claim 2, wherein The closure portion (51) has a first end face (511) and an opposite second end face (512), the closure member has a limiting structure (53) extending from the first end face of the closure portion, and the first end of the main body section is provided with a corresponding stop structure, through the cooperation of the limiting structure and the stop structure, the displacement of the closure member in the process hole can be further prevented.

4. The ejector pump apparatus of claim 3, wherein The limiting structure (53) comprises a rectangular body (531) extending from the first end face and two buckle portions (532) extending outwardly and obliquely from the end of the rectangular body, the two buckle portions are symmetrical about the center axis of the closure portion; the stop structure comprises two diametrically opposite protrusions (111) extending perpendicularly to the end face of the first end and an opening (112) provided in each of the protrusions for receiving the buckle portion (532).

5. The ejector pump arrangement of claim 3 or 4, characterized in that The screen portion (52) comprises a cylindrical screen (521) extending from the second end face of the closure portion and a cylindrical support section (522) extending from the cylindrical screen, wherein the mesh size of the cylindrical screen is smaller than the orifice size of the jet nozzle.

6. The ejector pump apparatus of any one of claims 1 to 4, wherein, The closure portion and the screen portion are integrally formed by a plastic material through an injection molding process.

7. The ejector pump apparatus of any one of claims 1 to 4, wherein, The distal suction section (4) and the fuel inlet section (2) are located on opposite sides of the main body section (10).

8. The ejector pump apparatus of any one of claims 1 to 4, wherein, The main body chamber further comprises a mixing section (6) and a diffusion section (7) downstream of the jet nozzle (3) in the direction of fuel flow, wherein the jet nozzle (3), the mixing section (6) and the diffusion section (7) are arranged in line.

9. A fuel supply system comprising a tank for containing fuel, a fuel pump arranged in the tank and an ejector pump arrangement according to any one of claims 1-8 associated with the fuel pump.

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