CN101435394B - Device for preventing loss of lubricant in LPI pump - Google Patents

Abstract

A device for preventing lubricant loss in an LPI pump, comprising: a box body including a first surface and a second surface, a first pipeline arranged on the first surface for communicating with the LPI pump and the box body, and a first pipeline arranged on the second surface The two surfaces are used to connect the exhaust hole with the second pipeline of the box and the partition wall arranged in the box to form the first chamber connected with the first pipeline and the second chamber connected with the second pipeline .

Description

Device to prevent lubricant loss in LPI pumps

Cross references to related applications

This application claims priority and benefit from Korean Patent Application No. 10-2007-0116114 filed with the Korean Intellectual Property Office on November 14, 2007, the entire contents of which are hereby incorporated by reference.

technical field

The present invention relates to a device for preventing lubricant loss in LPI pumps. More particularly, the present invention relates to a device for preventing loss of lubricant in an LPI pump, which includes a case provided with a partition wall, and prevents loss of lubricant in the LPI pump when LPG evaporates.

Background technique

Recently, LPG vehicles use a fuel pump in a fuel tank for storing fuel of an LPI (Liquefied Petroleum Gas Injection) system in which LPG (Liquefied Petroleum Gas) is directly injected into cylinders.

LPI vehicles are able to precisely control fuel injection, thereby enhancing engine output and improving its winter startability.

However, the scheme of the fuel pump in the LPI system is complicated by having a rotor shaft, multiple bearings, etc., and the viscosity of LPG fuel is low, so a lubricant must be used in the fuel pump.

LPG evaporates easily at room temperature. Therefore, the pressure in the fuel tank storing LPG must be greater than atmospheric pressure. Furthermore, since the fuel input to the engine must be in liquid form, the LPI system must pressurize the fuel to approximately 5 bar above the phase equilibrium pressure.

Because the LPI pump pumps fuel through the reciprocating motion of the plunger and the diaphragm, the greater the pressure difference across the plunger, the more the amount pumped decreases and the continuity becomes worse. Therefore, a hole is formed in order to minimize the pressure difference between the front and back of the plunger, so that the pressure in the pump in the oil tank can be maintained at a phase equilibrium pressure.

However, when for example the vehicle is driving down a slope, LPG may flow into the pump through the hole, the LPG may mix with the lubricant, and the lubricant may flow out when the LPG mixed with the lubricant evaporates.

When the lubricant flows out, the operation and durability of the LPI pump may deteriorate.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that this information does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Contents of the invention

The present invention seeks to provide a device for preventing loss of lubricant in an LPI pump, which includes a case provided with a partition wall and prevents loss of lubricant in the LPI pump when LPG evaporates.

A device for preventing loss of lubricant in an LPI pump according to an exemplary embodiment of the present invention may include: a box body including a first surface and a second surface, a box provided on the first surface for communicating with the LPI pump and the box body The first pipeline, the second pipeline arranged on the second surface for connecting the exhaust hole and the box body, and the second pipeline arranged in the box body to form a first chamber connected to the first pipeline and connected to the second pipeline The dividing wall of the second chamber.

The partition wall may extend from the first surface.

The second surface may be disposed higher than the first surface.

The second pipe may extend within the tank, and an end of the second pipe may be lower than an end of the partition wall.

An apparatus for preventing lubricant loss in an LPI pump according to an exemplary embodiment of the present invention may include: a vent hole formed in a curved form and preventing inflow of fuel in a liquid state, a box including a first surface and a second surface Body, the first pipeline arranged on the first surface for communicating with the LPI pump and the tank, the second pipeline arranged on the second surface for communicating with the exhaust hole and the tank, and the second pipeline arranged in the tank to form a connection with the first A partition wall of the first chamber connected with the pipeline and the second chamber connected with the second pipeline.

The partition wall may extend from the first surface, and the second surface may be disposed higher than the first surface.

The second pipe may extend within the tank, and an end of the second pipe may be lower than an end of the partition wall.

As described above, an apparatus for preventing lubricant loss in an LPI pump according to an exemplary embodiment of the present invention can prevent lubricant in the LPI pump from evaporating together with LPG through a simple scheme.

Description of drawings

FIG. 1 is a diagram showing the principle of an apparatus for preventing lubricant loss in an LPI pump according to an exemplary embodiment of the present invention.

Fig. 2 is a partial sectional view at point A in Fig. 1 .

Fig. 3 is a partial sectional view at B in Fig. 1 .

<Explanation of Reference Signs Denoting Main Components in Drawings>

100: box body 110: first surface

120: second surface 130: first pipeline

140: the second pipeline 150: the first chamber

160: second chamber 170: partition wall

200: exhaust hole 300: LPI pump

Detailed ways

Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the principle of an apparatus for preventing lubricant loss in an LPI pump according to an exemplary embodiment of the present invention.

FIG. 2 and FIG. 3 are a partial sectional view at A in FIG. 1 and a partial sectional view at B in FIG. 1 , respectively.

The tank 100, vent 200 and LPI pump 300 are shown in FIGS. 1-3.

The box body 100 includes a first surface 110 and a second surface 120 .

The first pipeline 130 is disposed on the first surface 110 for communicating the LPI pump 300 and the tank 100 .

The second pipeline 140 is disposed on the second surface 120 for communicating with the exhaust hole 200 and the box body 100 .

The partition wall 170 is disposed in the box body 100 to form the first chamber 150 connected to the first pipeline 130 and the second chamber 160 connected to the second pipeline 140 .

The partition wall 170 extends from the first surface 110 .

The second surface 120 is disposed higher than the first surface 110 .

The second pipe 140 extends inside the case 100 , and the end of the second pipe 140 is lower than the end of the partition wall 170 .

Accordingly, liquid LPG received through the second pipe 140 may be prevented from flowing into the LPI pump 300 through the first chamber 150 .

The arrows shown in Figure 2 indicate the inflow and outflow of LPG.

The outside of the vent hole 200 is located inside the tank in which LPG is in a liquid and vapor state, and the vent hole 200 is formed in a curved form to prevent LPG in a liquid state from flowing into the LPI pump 300 .

However, when the vehicle is running along a slope or the like, LPG in a liquid state can flow through the vent hole 200 .

As shown in FIG. 3 , LPG in a liquid state can be accumulated in the second chamber 160 by the partition wall 150 .

Therefore, LPG can be prevented from being mixed with the lubricant, so that evaporation of the lubricant can be prevented when the LPG evaporates.

That is, due to the exhaust hole 200 and the partition wall 150 , LPG in a liquid state may be prevented from directly flowing into the LPI pump 300 and being mixed with lubricant in the LPI pump 300 .

While the invention has been described in connection with what are presently believed to be operative exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments; various modifications and equivalents within the spirit and scope of the appended claims.

Claims (4)

1. device that is used for preventing the petrolift loss of lubricant of liquefied petroleum gas injection comprises:

The casing that comprises first surface and second surface;

Be arranged on first pipeline that first surface is used to be communicated with petrolift and casing;

Be arranged on second pipeline that second surface is used to be communicated with exhaust port and casing; And

Be arranged on the interior partition wall of casing in order to formation first chamber that is connected with first pipeline and second chamber that is connected with second pipeline,

Wherein partition wall extends from first surface,

Wherein second surface is set to be higher than first surface.

2. the device of loss of lubricant in the petrolift that prevents liquefied petroleum gas injection as claimed in claim 1, wherein second pipeline extends in casing, and the end of second pipeline is lower than the end of partition wall.

3. device that is used for preventing the petrolift loss of lubricant of liquefied petroleum gas injection comprises:

With the exhaust port that curve form forms and the fuel oil that prevents to be in a liquid state flows into;

The casing that comprises first surface and second surface;

Be arranged on first pipeline that first surface is used to be communicated with petrolift and casing;

Be arranged on second pipeline that second surface is used to be communicated with exhaust port and casing; And

Be arranged on the interior partition wall of casing in order to formation first chamber that is connected with first pipeline and second chamber that is connected with second pipeline,

Wherein partition wall extends from first surface, and second surface is set to be higher than first surface.

4. the device of loss of lubricant in the petrolift that prevents liquefied petroleum gas injection as claimed in claim 3, wherein second pipeline extends in casing, and the end of second pipeline is lower than the end of partition wall.

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