KR100814123B1 - Liquid Injection LP Fuel Pump for Motor Cooling and Explosion Proof - Google Patents

Abstract

A liquid spray type LPG fuel pump is provided to protect a motor unit from dust and moisture of fuel and to improve endurance of the motor by flowing the fuel through the gap between the inner wall and the outer wall of a double housing. A liquid spray type LPG fuel pump comprises a double housing having an inner wall(12) and an outer wall(11), a motor unit, and a pumping unit. There is a gap between the inner wall and the outer wall of the double housing, which serves as a path of fuel. The motor unit has a rotary shaft(6) which is projected on the inner wall toward the outer wall, and mounted on the inner wall. The pumping unit is formed at the inner part of the outer wall of the double housing, and operated by the motor unit.

Description

Liquid-injection LP fuel pump for cooling and explosion protection of motors

1 is a cross-sectional view showing a conventional fuel pump structure,

2 is a photograph showing the structure of a general motor,

3 is a cross-sectional view briefly expressed by extracting only the features from the liquid injection LPG fuel pump for cooling and explosion protection of the motor according to an embodiment of the present invention,

Figure 4 is a cross-sectional view showing a liquid injection LPG fuel pump for cooling and explosion protection of the motor according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

1: inlet port 2: outlet port

5: motor 6: rotating shaft

11: outer wall 12: inner wall

12a: connector 12b: axial hole

14: bearing 14a: welding

14b: Rubber packing 15: Impeller

15a: inlet groove

The present invention relates to a liquid injection LPG fuel pump for cooling and explosion protection of a motor for supplying fuel from a fuel tank to a vaporizer or an injection nozzle.

In general, the fuel pump is a device for supplying fuel from the fuel tank to the carburetor or injection nozzle (injection nozzle), the mechanical diaphram pump in the carburetor engine mainly the electric motor pump in the gasoline injection engine. ).

Most vaporizer fuel systems use mechanical fuel pumps and supply pressures of about 0.2 to 0.4 kg / cm2. The pump is mainly mounted on the cylinder block or head side and driven by the camshaft. As a general structure of the mechanical fuel pump, when the camshaft rotates, the eccentric cam rotates to push the actuation lever or rocker arm or push rod and operate the diaphragm connected thereto to feed the fuel.

The electric motor type fuel pump has an electric motor type and a solenoid type method, but most electric motor type fuel pumps are commercially available. Compared to the mechanical fuel pump, the electric motor fuel pump can supply enough fuel at all times as required by the engine and maintain the residual pressure in the circuit so that the fuel can be supplied at the moment the ignition switch is operated and has a strong advantage on vapor lock. There is this.

In addition, the electric motor-type fuel pump is operated by the start switch when the ignition switch is in the start at engine startup, and is controlled ON / OFF by the ECU (ECM) after the engine is operated. The ECU stops the fuel pump if no ignition signal or rotational speed signal is input. When the motor rotates, the rotor mounted on the side rotates, and the rotor is eccentric to the pump housing and rotates along the inner wall of the housing as much as the volume difference during the rotation. In general, the discharge pressure of the fuel pump in the gasoline injection engine is slightly different depending on the engine, but is usually about 3 ~ 6kg / ㎠.

On the other hand, such a motor fuel pump is shown in FIG. Looking at the motor type fuel pump 100 with reference to Figure 1 it can be seen that the flow of fuel (8) is moved around the motor (5).

Here, reference numeral 1 denotes an inlet which is a passage between the fuel tank (not shown) and the motor fuel pump 100, and (2) indicates the motor fuel pump 100 and the vaporizer or the injection nozzle (not shown). A discharge port serving as a connection passage between the nozzles, and (3) and (4) are check valves, and (6) is a rotating shaft.

Motor fuel pump (100) for LPG vehicles is composed of a pumping unit (7) for pumping fuel and a motor (5) for providing power. During operation, the pump flows in a state full of fuel in the pump. The absence of oxygen does not cause an explosion by the brush of the motor or the spark of the power supply, but the risk of explosion should be taken into account when there is a possibility of explosion by the mixer in the pump when the engine is stopped or the fuel tank is exhausted.

More specifically, as shown in FIG. 2, the motor includes a stator of magnets and a rotor of windings. The winding of the rotor is connected to an external DC power source through a brush. As the rotor rotates, the brush is rotated. The polarity of the power supply and external power is constantly changed, and the magnetic field generated in the rotor is also changed in direction. However, when the contact between the rotor and the brush causes abrasion of the brush and impact on the pump body, there is a risk of explosion due to the spark of the brush due to the instantaneous non-contact state.

In addition, in the case of the LPG motor type fuel pump, when fuel flows into the pump, the characteristics of the low boiling and low viscosity fuel LPG affect the bearings supporting the motor, which causes the efficiency and durability of the pump to be deteriorated.

More specifically, lubrication of motor armature shafts and bushes is required, and lubrication of bearings is required for all types of fuel pumps. In the case of gasoline or diesel pumps, fuel is lubricated and mixed in fuel. Dirt or moisture inhibited lubrication and accelerated abrasion of rollers and balls of bushes and bearings, resulting in a significant drop in durability.

This phenomenon also occurs when fuel is depleted or when low viscosity fuels having a low boiling point such as LPG are used.

Therefore, in recent years, as the environmental regulations of automobiles are strengthened, increasing the durability of fuel pumps for vehicles is increasingly required, and in North America, the durability of the vehicle is required to be equal to the durability of the vehicles. In order to cope with this problem, there is a demand for justification to increase the life of the fuel pump.

In addition, automobile manufacturers are producing LPG Liquid Phase LPG Injection (LPLI) -type vehicles. Currently, the number of LPG vehicles in Korea has surpassed 2 million units, securing the world's best LPG supply technology. As the technology applied to the fuel pump, which is a core part of the LPLi fuel system, is imported from abroad, it is a very urgent time for localization development.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to protect the motor unit from dust and moisture contained in the fuel, thereby preventing the motor from being significantly reduced durability of explosion-proof and bearings, etc. To provide a liquid injection LPG fuel pump for cooling and explosion protection.

An object of the present invention as described above, in the device for supplying fuel from the fuel tank to the carburetor or injection nozzle, a double housing having a gap (gap) between the inner wall and the outer wall and the fuel flow in the gap; A motor unit having a rotation shaft protruding from the inner side of the inner wall of the double housing to the inner side of the outer wall and provided inside the inner wall; It is achieved by a liquid injection LPG fuel pump for cooling and explosion protection of the motor, characterized in that it comprises a; a pumping unit which is provided on the inner side of the outer wall of the double housing and driven by the motor unit.

In addition, in the present invention, one side of the outer wall of the double housing is connected to the inlet so that the fuel of the fuel tank is introduced, the other side is connected to the discharge port for delivering fuel to the injection nozzle, the direction of movement of the fuel is connected to the fuel tank It is characterized in that it is introduced into the interior of the dual housing by the pumping of the pumping portion through the inlet and discharged to the discharge port through the gap between the outer wall and the inner wall of the double housing.

Other features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention will be described in detail, in adding reference numerals to the components of each drawing, the same components are possible even if displayed on different drawings It should be noted that the same reference numerals are used. In describing the present invention, when it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 3 is a simplified cross-sectional view showing only the features extracted from the liquid injection LPG fuel pump for cooling and explosion protection of the motor according to an embodiment of the present invention, Figure 4 is a cooling and cooling of the motor according to another embodiment of the present invention A cross-sectional view showing a liquid injection LPG fuel pump for explosion protection.

The present invention relates to a device for supplying fuel from a fuel tank to a vaporizer or an injection nozzle, comprising an inner wall 12 and an outer wall 11, and between the inner wall 12 and the outer wall 11. A dual housing having a gap in the fuel flow through the gap, a motor 5 for generating rotational force, a rotation shaft 6 for transmitting rotational force of the motor 5, and the rotation shaft 6 It is composed of a motor unit having a bearing 14 to support, and a pumping unit provided inside the outer wall 11 of the double housing and driven by the motor unit. The rotary shaft 6 is protruded outward through the shaft hole 12b formed at one side of the inner wall 12, and the rotary shaft 6 inside the outer wall 11 having a gap with the inner wall 12. The pumping part connected to the impeller 15 includes two partitions 17 and 18 at the inlet 1 side of the outer wall 11 and an inflow groove 15a is formed between the partition walls 17 and 18. Interposed therebetween, the one partition 17 is formed on the inlet (1) side to form the inlet (17a), the other partition 18 to form the outlet (18a) and the through hole (18b) It is a feature provided in the motor part side.
In addition, one side of the outer wall 11 is formed with a connecting pipe 12a connecting with one side of the inner wall 12 so that a conductive wire for supplying power to the motor 5 is connected to the motor 5. The inlet 1 and the outlet 2 are connected to one side and the other side of the outer wall 11.

Here, the bearing 14 is provided on the inner circumferential surface of the shaft hole 12b, the connection of the bearing 14 and the shaft hole 12b may be connected using a connection portion, it may be tightly fixed by packing. An example of the connection part may be a welding 14a, and in the case of a packing, a rubber packing 14b may be used. The connection part and the packing are provided to have oil tightness (the property that fuel does not penetrate into the inner wall). Although it is different from the kind of composition mentioned above, it can be used if it is a structure and material which has oil-tightness.

Referring to the operation relationship of the present invention with such a configuration as follows.

The inlet port 1 and the outlet port 2 provided on one side and the other side of the outer wall 1 is used as a passage for supplying fuel from the fuel tank (not shown) to the injection nozzle (not shown), respectively. When the fuel passing through the inlet port 1 is pumped, that is, when the impeller 15 is rotated by the motor 5, the inlet groove 15a at the outer circumference of the impeller 15 causes friction of the fuel generated in front and behind it. The fuel is introduced by the pressure difference generated by the action. As the fuel introduced into the outer wall 11 by the pumping part is prevented from flowing into the inner wall 12 by the connection part or the packing, the discharge port through the gap formed in the inner wall 12 and the outer wall 11 ( Go to 2).

At this time, the fuel passes between the inner wall 12 and the outer wall 11, and because the properties of the fuel is also cold, the inner wall 12 is made of a good thermal conductivity material has the advantage of cooling the heat of the motor. Such a thermally conductive material is preferably a metal material.

The liquid injection type LPG fuel pump for cooling and explosion protection of the motor as described above can be applied to a configuration to which the LPG fuel system is applied to prevent the possibility of explosion of the pump and deterioration of durability due to wear of bearings. It can be effective. In addition, it is possible to localize the LPG fuel pump to ensure durability by changing the structure of the existing LPG fuel pump.

Although the present invention has been described in connection with a preferred embodiment, those of ordinary skill in the art will be able to easily make various changes and modifications without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not in scope, and the true scope of the present invention is shown in the appended claims rather than the foregoing description, and all differences within the equivalent scope are included in the present invention. It should be interpreted as.

Claims (10)

In the device for supplying fuel from the fuel tank to the vaporizer or injection nozzle (injection nozzle or injector), A double housing having an inner wall (12) and an outer wall (11), having a gap between the inner wall (12) and the outer wall (11), and having fuel flow through the gap; A motor unit provided inside the inner wall 12 having a rotating shaft 6 protruding from the inner wall 12 of the dual housing to the inner side of the outer wall 11; A pumping unit provided inside the outer wall 11 of the dual housing and driven by a motor unit; Liquid injection LPG fuel pump for cooling and explosion protection of the motor, characterized in that comprises a. The method of claim 1, One side of the outer wall 11 of the double housing is connected to the inlet 1 so that the fuel of the fuel tank is introduced, the other side is connected to the discharge port 2 for delivering the fuel to the injection nozzle, the direction of movement of the fuel The pump is pumped into the interior of the double housing through the inlet (1) connected to the tank and discharged to the discharge port through the gap between the outer wall 11 and the inner wall 12 of the double housing of the Liquid injection LPG fuel pump for cooling and explosion protection. The method of claim 1, The double housing is a connection connecting one side of the inner wall 12 and one side of the outer wall 11 so that a conductive wire for supplying power to the motor 5 provided inside the inner wall 12 is connected to the motor 5. Liquid injection type LPG fuel pump for cooling and explosion protection of the motor, characterized in that the tube (12a) is formed. The method of claim 2, The pumping part includes two partitions 17 and 18 at the inlet 1 side of the outer wall 11 and intersects the impeller 15 having the inlet grooves 15a formed between the partitions 17 and 18. But The one partition wall 17 is formed on the inlet port 1 by forming the inlet port 17a, and the other partition wall 18 is formed on the motor unit side by forming the outlet port 18a and the through hole 18b. Liquid injection LPG fuel pump for cooling and explosion protection of the motor, characterized in that. The method of claim 1, The inner circumferential surface of the shaft hole 12b formed on one side of the inner wall 12 of the double housing and the outer circumferential surface of the bearing 14 for fixing the rotation shaft 6 are connected to each other by a connection to block fuel from flowing into the inner wall. Liquid injection LPG fuel pump for cooling and explosion-proof of the motor, characterized in that. The method of claim 5, Liquid injection-type LPG fuel pump for cooling and explosion protection of the motor, characterized in that the connection portion is made of a welding (14a). The method of claim 1, Packing is provided on the inner circumferential surface of the shaft hole 12b formed on one side of the inner wall 12 of the double housing or on the outer circumferential surface of the bearing 14 for fixing the rotation shaft 6 so that fuel is introduced into the inner wall 12. Liquid injection type LPG fuel pump for cooling and explosion protection of the motor, characterized in that blocking the inflow. The method of claim 7, wherein Liquid packing LPG fuel pump for cooling and explosion protection of the motor, characterized in that the packing is silicon or rubber packing (14b). The method of claim 1, Liquid injection type LPG fuel pump for cooling and explosion protection of the motor, characterized in that the dual housing, or the inner wall 12 is made of a thermally conductive material to induce cooling of the motor (5) using the LPG fuel. The method of claim 9, The thermally conductive material is a liquid injection LPG fuel pump for cooling and explosion protection of the motor, characterized in that the metal material.

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