JPH0420486Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in a fuel pump used to pump and supply fuel in a fuel tank to, for example, an internal combustion engine for an automobile.

[Conventional technology]

3 and 4 show fuel pumps according to the prior art. In the figure, 1 is a pump body that constitutes a submerged fuel pump installed in a fuel tank, 2 is a cylindrical casing with a lid that constitutes the pump body 1, and inside the casing 2 is a DC motor, etc. A motor section including an electric motor and a roller vane type or turbine type pump section (neither shown) rotationally driven by the motor section are provided. Further, a suction port (not shown) communicating with the pump section is formed at the lower end of the casing 2, and a large dustproof filter 4 is provided at the suction port via a hose 3. On the other hand, a fuel discharge port 5 is provided in the upper end side lid portion 2A of the casing 2.
, a relief valve 6 that opens when the inside of the casing 2 reaches a predetermined pressure to release fuel to the fuel tank, and a hot restart valve that discharges vapor generated inside the casing 2 to the fuel tank. 7 is provided.

Reference numeral 8 denotes a metal vapor discharge pipe for guiding the vapor in the casing 2 to the fuel tank side via the hot restart valve 7, and the base end 8A of the vapor discharge pipe 8 is connected to the hot restart valve 7. , the intermediate portion 8B is formed in an abbreviated shape bent into an inverted U shape. The vapor discharge pipe 8 is disposed from the upper end side of the casing 2 to the lower end side along the outer peripheral surface, and is attached to the casing 2 with a fixing band 9 with its tip 8C protruding toward the inner wall surface of the fuel tank. It is fastened.

Reference numeral 10 denotes a small dust-proof filter inserted into the tip 8C of the vapor discharge pipe 8 to prevent dust from entering during backflow of fuel.The filter 10 is made of synthetic resin such as polyacetal, and
A base 10A inserted into the C opening, and the base 10A.
The hemispherical filter element 10B is made of a metal mesh, such as stainless steel, and is fixed to the filter element 10B.

The conventional technology is configured as described above, and when the engine is started by the engine switch, the motor section of the pump body 1 is started, and when the pump section is driven to rotate, the fuel in the fuel tank is sequentially passed through the large filter 4 and the hose 3. The fuel is sucked into the pump section through the suction port, passes around the motor section, and is supplied under pressure from the discharge port 5 to the internal combustion engine side. In addition, after the drive of the pump section is stopped, the fuel inside the casing 2 flows out to the fuel tank side, creating a negative pressure inside the casing 2, and the temperature of the motor section, which was cooled by the flowing fuel, increases. At this time, the temperature inside the casing 2 becomes higher than when the fuel pump is operating, and the fuel inside the casing 2 easily vaporizes, causing a vapor generation phenomenon. Therefore, a hot restart valve 7 is provided in the pump body 1, and a vapor discharge pipe 8 is connected to the valve 7, so that the vapor in the casing 2 is discharged to the fuel tank side.

By the way, for example, if you accidentally connect the anode and cathode in reverse when connecting an electric motor to a power source,
Since the electric motor rotates in reverse, the pump section also rotates in reverse. Then, the fuel in the casing 2 is discharged from the suction port to the fuel tank side, creating a negative pressure, and a phenomenon occurs in which the fuel in the fuel tank is sucked through the vapor discharge pipe 8. Therefore, in the prior art, in order to prevent foreign matter, dust, etc. from being sucked into the fuel tank when fuel backflows from the tip 8C side of the vapor exhaust pipe 8 due to the reverse rotation of the motor part, the vapor exhaust pipe A configuration is adopted in which a dustproof filter 10 is also provided at the tip 8C of the valve 8 to prevent dust from entering during backflow.

[Problem that the invention attempts to solve]

In the above-mentioned prior art, since the dustproof filter 10 provided on the vapor discharge pipe 8 is not provided with a protective member, when the fuel pump is assembled to the fuel tank, or when the fuel tank is placed on a curb. As the dust filter 10 deforms when it comes into contact with a
The disadvantage is that the filter 10 is deformed as shown in the figure, the mesh of the filter 10 is crushed, vapor is not discharged properly, and the vapor remains inside the casing 2.

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The present invention provides a dustproof filter installed at the tip of the vapor discharge pipe to protect against shocks caused by the deformation of the fuel tank or when it is assembled to the fuel tank. It is an object of the present invention to provide a fuel pump that can prevent deformation or collapse due to twisting, and can reliably prevent problems such as insufficient vapor discharge.

[Means for solving problems]

The features of the configuration adopted by the present invention in order to solve the above-mentioned problems are that the dust-proof filter is connected to the tip side of the vapor discharge pipe, and includes a filter support body having a vapor discharge hole formed on the inner circumference side; a hemispherical filter element provided on the lower surface of the filter support so as to cover the vapor discharge hole of the filter support from below, and protruding downward from the lower surface of the filter support; The filter body is provided with a protection member formed in an abbreviated shape so as to straddle the filter element from the outside, and consisting of a plurality of protection rods whose upper ends are fixed to the filter support.

[Effect]

With the above configuration, each protection rod of the protection member can protect the filter element without reducing the filtration area by straddling the filter element from the outside. The vapor can be prevented from directly colliding with the inner wall surface of the fuel tank, etc., and the vapor can be smoothly discharged via the filter element.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2. Note that the same reference numerals are given to the same components as those of the prior art described above, and the explanation thereof will be omitted.

21 in the figure is the tip 8C of the vapor discharge pipe 8.
The filter 21 is a hollow disc with bosses 22A and 22B protruding from both upper and lower surfaces in the axial direction and a vapor discharge hole 22C formed in the center. body part 2
2, four insertion holes 23, 23, . . . located on the outer periphery side of the boss portions 22A, 22B and spaced apart in the circumferential direction of the body portion 22, and the inner peripheral surface of the vapor discharge hole 22C. A female thread 24 is formed on the upper side, and a hollow insertion shaft 2 is inserted into the vapor discharge pipe 8 on the upper side in the axial direction.
5A, and the lower part in the axial direction is the female thread 24 of the body part 22.
The cap 25 is a male threaded portion 25B that is screwed into the upper part of the body part 22 in the axial direction, and the vapor discharge hole 22C is fixed to the lower boss part 22B of the body part 22 facing the cap 25. The filter element 26 has a hemispherical shape and is made of a metal mesh surrounding the opening of the body 22. The filter element 26 projects downward from the lower boss portion 22B of the body portion 22. The body 22 is the cap 2.
5 constitutes a filter support, and the cap 25
It is connected to the distal end side of the vapor discharge pipe 8 via the insertion shaft 25A as shown in FIG.

On the other hand, 27 is a protection member for preventing the filter element 26 from being deformed, and the protection member 27 is made up of a pair of protection rods 28 and 29 combined. Here, each protection rod 28, 29
The opposite ends in the axial direction are the opposing parts 28A ₁ , 28A ₁ , 29
A ₁ , 29A ₁ abbreviated rod body 28A,
29A, and the rod bodies 28A and 29A are formed at both axial ends of the rod bodies 28A and 29A, and the lower side in the axial direction is formed on the inner diameter of the hole 23 so that it can be easily inserted into the insertion hole 23 and cannot be pulled out after insertion. frustoconical tip engaging portions 28B, 28B, and 29B with a slightly larger diameter;
29B (however, one is not shown), and a lower portion protruding from the outer periphery of the tip side of the protection rods 28, 29 and spaced apart in the axial direction from the tip engaging portions 28B, 29B by the thickness of the body portion 22. Side collar parts 28C, 28C and 29
It is integrally formed from C and 29C. Each protection rod 28, 29 is made of nylon 66, for example.
They are the same in that they are made of a mixture _of glass fibers and reinforced with glass _fiber .
The opposing parts 29A ₁ and 29A ₁ are the protective rods 28 of the one
It is formed to be elongated by the diameter of. As a result, the protection rods 28 and 29 are connected to the filter element 26.
The tip engaging portions 28B, 2 are attached to the body 22 of the filter 21 in a cross-like manner so as to straddle them from the outside.
It is assembled via 9B.

This embodiment is configured as described above, and first,
Each end engaging portion 28B, 28B of one protection rod 28
is press-fitted from the filter element 26 side into the insertion hole 23 of the body 22 constituting the filter 21, and by engaging the lower flanges 28C, 28C with the rim of the insertion hole 23, The protection rod 28 is assembled to the body part 22 in such a manner that it cannot be moved in either the upward or downward direction in the axial direction. Next, the respective distal end engaging portions 29B, 29B of the other protection rod 29 are inserted into the other insertion holes 23, 23 of the body portion 22 in the same manner, and the one protection rod 28 is fitted in a cross shape. By assembling the protection member 27 to the body portion 22 in a state where the filter elements 26 intersect with each other, the protection member 27 of the embodiment can be provided on the filter 21 in a state where it straddles the filter element 26 from the outside.

As described above, according to this embodiment, the vapor discharge pipe 8
Since the filter 21 provided at the tip 8C of the filter element 26 is provided with a protection member 27 consisting of two abbreviated protection rods 28 and 29 so as to straddle the filter element 26 from the outside, the protection rods 28 and 29
can be formed into a simple shape, filter element 2
filter 2 without reducing the filtration area of filter 6.
In addition to being easy to attach to the body 22 of the fuel tank, when the fuel pump is assembled to the fuel tank, the filter element 26 is prevented from colliding with the inner wall surface of the tank and being deformed or crushed. can be prevented. Further, since the desired filtration area can be secured without the protection rods 28 and 29 coming into contact with the filter element 26, vapor in the pump body 1 can be smoothly discharged via the filter element 26.

In the embodiment, the protection member 27 has been described as being composed of a pair of independent protection rods 28 and 29 having an abbreviated shape, but each of the protection rods 28 and 29 may be integrally molded, or three pieces may be formed. may be combined with independent protection bars. Further, the protection rods 28 and 29 may be formed in an arc shape.

[Effect of idea]

As detailed above, according to the present invention, the filter support of the dust filter is provided with a plurality of protection rods formed in an abbreviated shape so as to straddle the filter element from the outside. Therefore, the filter element can be protected, and when the fuel pump is assembled into the fuel tank, it is possible to reliably prevent the filter element from directly colliding with the inner wall surface of the fuel tank.

Therefore, it is possible to prevent the filter element of the dust-proof filter from being deformed and becoming obstructed, and it is possible to solve problems such as poor vapor drainage due to the obliteration. Furthermore, each protection rod has a simple, abbreviated shape, and can be easily assembled to the filter support of the dustproof filter without reducing the filtration area of the filter element. Fuel vapor can continue to be smoothly discharged into the fuel tank via the filter element.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a partially cutaway front view showing a state in which a protection member is provided on a dustproof filter, Fig. 2 is an exploded perspective view of the dustproof filter and protection member, and Figs. 3 and 4 show a prior art. FIG. 3 is an external perspective view of a fuel pump in which a dustproof filter is provided on a vapor discharge pipe, and FIG. 4 is a front view of the dustproof filter showing a state in which the filter body is deformed. 1...Pump body, 2...Casing, 7...
Hot restart valve, 8... vapor discharge pipe,
21...Dust filter, 27...Protection member.

Claims (1)

[Scope of utility model registration request] A pump body provided in a fuel tank and having a built-in motor part and a pump part; a hot restart valve provided on the upper end side of the pump main body for discharging fuel vapor generated in the pump main body to the outside; a vapor discharge pipe whose base end is connected to the hot restart valve and whose distal end extends downward along the outer circumferential side of the pump body; A fuel pump equipped with a dust filter that removes dust from the fuel when the fuel flows back into the pump body through the vapor discharge pipe, the dust filter being connected to a distal end side of the vapor discharge pipe, A filter support having a vapor discharge hole formed on the inner circumferential side, and a filter support provided on the lower surface side of the filter support so as to cover the vapor discharge hole of the filter support from below, and a hemispherical filter element protruding downward, and the filter support is formed in an abbreviated shape so as to straddle the filter element from the outside;
1. A fuel pump characterized in that a protection member is provided having a plurality of protection rods whose upper end side is fixed to the filter support.