JPS62214294A - Fuel pump device - Google Patents

Abstract

PURPOSE:To reduce noises by connecting an extension passage extending upward to a vapor release port which is communicated with a pump chamber, and opening the end of this extension passage in the inside of a fuel tank. CONSTITUTION:A vapor release port 5 connecting the inside and outside of a pump chamber 4 is provided so that the vapor produced in the pump chamber 4 can be discharged to the outside of the pump chamber 4. To the vapor release port 5 a pipe 8 is connected to form an extension passage, and the termination of an opening end 97 thereof is opened in the inner upper part of a fuel tank 100. Thus, noises can hardly reach the outside of the tank, and noises can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel pump device mainly used in automobiles.

[Conventional technology]

A conventional device of this type is described in US Pat. No. 3,947,148. This is a turbine pump that pumps fuel by rotating an impeller inside the pump chamber.

All pumps of this type generate high-frequency noise with a frequency equal to the product of the number of blades on one side of the impeller and the rotational frequency of the motor. In recent years, as vehicle interiors have become quieter, this high-frequency noise has often become a nuisance, especially for passengers in the rear seats. In order to reduce this, it is considered that the pitch of the impeller blades is unequal, and that the entire pump or tank is made to have a soundproof structure.

[Problem that the invention seeks to solve]

However, the above-described conventional unequal pitch impeller does not provide a sufficient effect, and a structure in which the entire tank is made to have a soundproof structure is extremely disadvantageous from a cost and weight standpoint. That is, as a practical matter, it has been impossible with the prior art to reduce this noise through relatively simple improvements.

Therefore, an object of the present invention is to effectively reduce noise with a relatively simple configuration at low cost.

[Means for solving problems]

Therefore, the present invention provides a fuel pump device in which an upwardly extending extension passage is connected to a paper relief hole communicating with a pump chamber, and the tip of this extension passage is opened into a fuel tank.

[Effect]

As a result, the impeller sound passes through the paper relief hole, passes through the extended passage, and is radiated into the air if the open end is above the liquid level. In general, sound propagates much more slowly in gas than in liquid, so cabin noise can be significantly reduced. On the other hand, if the open end is in the liquid, the impeller sound will be radiated into the liquid, but in the tank, the closer the sound source is to the liquid level, the less sound pressure will be generated, so the noise will still be reduced. can.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, reference numeral 14 denotes an impeller made of synthetic resin, and is a so-called closed vane type regeneration pump impeller having a large number of vanes 15 on its outer peripheral surface. 1
A motor output shaft 6 is connected to the impeller 14 and is provided to drive the impeller 14. 17 is a pump cover made of aluminum. 18 is a bearing held by the pump cover, and 20 is a pump cover recess provided in the pump cover. 19 is a pump housing recess formed in the center of the pump housing 6.

The pump housing 6 is made of aluminum like the pump cover 17, has a pump housing convex portion 21 on the outside, and has an integral suction port 12 at the lower end.

The pump housing 6 and the pump cover 17 are connected by an outer cylindrical housing 22. This cylindrical housing 22 forms the side of the motor, and at the same time forms the housing of the pump device. 23 is a motor body, which is a DC magnet motor. 24 is a field magnet, 25 is a rotor,
26 is an armature core. As is well known, a slot (not shown) is formed in the armature core 26, and an armature coil is wound within the slot. 27 is a resin molded part, which fills the aforementioned slot of the armature core and inserts the armature coil into the resin molded part 27.
The outer circumferential surface of the rotor 25 is made smooth to reduce agitation loss of the liquid. 28
30 is a commutator, and 30 is a brush that comes into sliding contact with the commutator 28, and is housed in a brush holder 29. 31 is a brush mounting plate made of synthetic resin material.

A terminal housing 32 is made of a synthetic resin material, and a metal connection terminal 33 extends through the terminal housing 32. Reference numeral 34 denotes an alignment bearing, which pivotally supports the aforementioned motor output shaft 16.

A bearing support plate 35 is made of a spring material and holds the alignment bearing, and the cough bearing support plate 35 is held on the inner peripheral wall of the terminal housing 32. The bearing support plate 35 is ring-shaped and has a large number of holes formed so that gasoline as a fluid passes through the bearing support plate 35.

36 is a thrust washer, and 37 is a lead wire, which is used to connect the brush 30 with the power led from the connection terminal 33 mentioned above. 38 is a discharge passage for gasoline as a fluid, and 39 is a check valve, which is supported by a check valve holding cylinder 40. A relief valve 41 has a spherical valve body, and this valve body is pressed by a coil spring 42 against a part of the terminal housing 32 that forms a valve seat. Reference numeral 43 denotes a stopper that holds the coil spring 42.

A pump chamber 4 is formed around the impeller 14 at the lower end of FIG. 1, and a paper relief is provided to connect the inside of the pump chamber 4 and the outside of the pump chamber so that the vapor generated inside the pump chamber 4 is discharged outside the pump chamber. A hole 5 is provided. The haver escape hole 5 is a thin hole drilled downward in the pump housing 6, and is machined with a drill or the like after the pump housing is molded.

A pipe 8 made of iron having a length of 160 mm and extending upward is connected to the paper relief hole 5 to form an extension passage.

Reference numeral 97 indicates an open end that opens at the top of the fuel tank 100 at the tip of the extension passage; 98 indicates the liquid level of the fuel within the fuel tank 100;
Reference numeral 9 denotes a fuel filter connected to the intake port 12, and the fuel pump is arranged and fixed within the fuel tank 100 by a holder 101.

Next, the operation of the above configuration will be explained.

The vapor generated in the pump chamber 4 is released through the paper escape hole 5.
However, at this time, the impeller sound generated in the pump chamber 4 also passes through the paver relief hole 5. However, in this embodiment, the vapor,
The fuel, impeller, etc. are not radiated directly into the tank 100, but instead pass through an extension passage 8 connected to the paver relief hole 5. Therefore, due to the positional relationship between the open end 97 of this extended passage 8 and the liquid level 98, if the open end 97 is located above the liquid level 98, the vapor, fuel, and impeller sound will not be in the liquid; radiated into the air. Because sound is far more difficult to transmit in air than in liquid, impeller noise rarely reaches outside the tank.
Significant noise reduction is possible. On the other hand, if the amount of liquid in the tank 100 is large and the opening end 97 is located below the liquid level,
Vapor, fuel, and impeller noise result in radiation into the liquid. In this case, the former is considered to have no significant effect, but generally sound pressure is less likely to occur when the sound source is far from the wall than when it is near the wall.
Noise is still reduced.

FIG. 3 shows the results of experiments confirming the noise reduction effect in the former case, that is, when the open end 97 is located above the liquid level 98. Fix the microphone in the center of the rear seat of the vehicle, and with the engine stopped, set the voltage between the pump terminals to 11 to 14V.
continuously in about 100 seconds. Naturally, the rotational speed of the motor gradually increases, and the frequency of the impeller sound also increases accordingly. At that time, the solid line in Figure 3 is the result of measuring how the sound pressure of the impeller sound changes with frequency using the microphone. Compared to the conventional pump shown by the dashed line in FIG. 3, the pump according to this embodiment has a remarkable noise reduction effect, which clearly shows the effectiveness of this embodiment. Figure 2 is a schematic representation of the inside of the tank during the experiment, in which a 16-meter iron pipe with an inner diameter of 61 m was used as the extension passage 8.
It is connected to the paper escape hole 5 by adhesive, and although not shown in the figure, it is fixed to the pump body with a resin band to maintain its strength.

FIG. 4 shows another embodiment of the present invention, in which, compared to the embodiment shown in FIG. An enlarged chamber 8a is formed facing downward, and an open end 97 is formed on the lower side wall of the enlarged chamber 8a. By doing so, even if the entire extension passage 8 is submerged in liquid, the expansion chamber 8a
Since there is always some air inside the impeller, the impeller sound will go out into the air at least once, which can significantly reduce noise. As a result, unlike the embodiment shown in FIG. 1, it is not affected by the height of the liquid level, and a stable effect can be obtained.

In the embodiments described above, the material of the extension passage 8 may be metal or resin. Furthermore, the method for connecting the pump body and the extension passage 8 is not limited to adhesive, but may also be crimped, fitted, riveted, or the like. In other words, any structure may be used as long as it allows vapor, fuel, and impeller sound to pass through the air once.

〔Effect of the invention〕

As described above, the present invention has the excellent effect of being able to effectively reduce noise with a relatively simple and inexpensive configuration that only provides an extension passage in the paper relief hole.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the device of the present invention, Fig. 2 is a schematic configuration diagram showing the device shown in Fig. 1 installed in a tank, and Fig. 3 is a noise noise of the device shown in Fig. 1. A characteristic diagram showing the characteristics in comparison with a conventional example, and FIG. 4 is a longitudinal sectional view showing another embodiment of the device of the present invention. 4... Pump chamber, 5... Paver relief hole, 8...
・Extension passage (pipe), 8a... Expansion room, 100...
・Fuel tank.

Claims (2)

[Claims] (1) A fuel pump device in which an upwardly extending extension passage is connected to a vapor relief hole communicating with a pump chamber, and the tip of this extension passage is opened into a fuel tank. (2) The fuel pump chamber according to claim 1, wherein an enlarged chamber is formed in a part of the extension passage.