JP4922129B2 - Water separator - Google Patents

Description

  The present invention relates to a water separator, and for example, relates to a water separator that removes moisture in fuel in a process of supplying fuel from a fuel tank to a fuel injection device of an engine.

  Conventionally, when an operator of a construction machine operates the construction machine, the water in the fuel (for example, light oil) separated by a water separator (water separator) is discharged. As a conventional water separator, the water separated by the screen accumulates in the case and is naturally separated by utilizing the difference in specific gravity between the fuel and water. When the separated water reaches a predetermined amount, the lower drain plug is attached. The thing of the structure drained by opening is known (patent documents 1 and 2).

  The water separator 1 shown in FIG. 6 is called a non-self-ventilation type described in Patent Document 1, but this structure opens the upper vent plug 30 when draining, thereby removing air. There is a problem that the work must be complicated because it must be taken into the case 11. The one described in Patent Document 2 is basically the same. Therefore, there is also a water separator called a self-ventilation type in which an air hole is provided in the vicinity of the drain plug 15 (Patent Document 3). With this structure of the water separator, opening the drain plug at the bottom of the case allows the outside and the inside of the case to communicate with each other through the air hole, so air can be taken into the case without opening the top vent plug. , Can simplify the work.

Japanese Utility Model Publication No. 60-63406 Japanese Utility Model Publication No. 3-82871 International Publication No. 90/07666 Pamphlet

  However, in the self-ventilation type water separator, the air from the air holes enter the case from below, so that the fuel and water separated from each other are agitated when rising as bubbles, resulting in water There is a problem that fuel is discharged as well. Furthermore, there is a problem that work hygiene deteriorates due to the fuel being discharged.

  An object of the present invention is to provide a water separator that can reliably drain the separated water and maintain good working hygiene when draining.

A water separator according to claim 1 of the present invention is a water separator that separates fuel and water, and is provided with a case having a level line on the outer periphery thereof, provided inside the case, and passed through the bottom of the case. An air conduction part communicating with the outside, a drain valve attached to the bottom of the case and having a drainage channel for discharging water, the upper end of the air conduction part being opened above the level line The bottom of the case is provided with a long hole-like concave portion that opens downward and communicates with the air conducting portion, and the major axis of the concave portion is larger than the channel diameter of the drainage channel. It is characterized by that.

A water separator according to a second aspect of the present invention is the water separator according to the first aspect , wherein the concave portion is formed to be recessed upward.

The water separator according to claim 3 of the present invention is the water separator according to claim 1 or 2 , wherein a screen including a filter is disposed in an upper portion of the case, and an upper end of the air conducting portion is It is located in the screen.

  In the above, according to the first aspect of the invention, since the upper end of the air conducting portion is above the level line, when the operator opens the drain valve, the air that has entered the air conducting portion becomes a bubble. Guided to the pure fuel side after separation. Therefore, only water can be reliably discharged from the lower drain valve without stirring the fuel and water separated by such bubbles.

According to the first aspect of the present invention, since the major axis of the recess is much longer than the channel diameter of the drainage channel, when the operator opens the drain valve, the opening position of the air conduction part and the water Even when the outflow direction overlaps with the plane, the opening of the lower end of the air conducting portion is not blocked by the flow of water, and air can be smoothly taken in from the end of the recess. As a result, air can be sent into the air conduction portion, and water can be reliably discharged from the drainage channel.

According to the second aspect of the present invention, since the concave portion is formed to be depressed, when the drain valve is opened, the fuel accumulated in the concave portion can be discharged first before the fuel accumulated in the drainage channel is discharged. As a result, the air conduction part and the outside communicate with each other immediately via the recess, so that the air can be satisfactorily taken into the air conduction part and the fuel is prevented from leaking from the air conduction part, and the water is discharged from the drainage channel. Can be discharged reliably.

According to the invention of claim 3 , since the opening at the upper end of the air conducting portion is positioned inside the screen, it is positioned far above the boundary surface between water and fuel. Thus, it is possible to more reliably prevent the water and the fuel separated from each other from being stirred.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a front view showing the water separator 1 according to the present embodiment in a partial cross section. FIG. 2 is a bottom view of the case 11 of the water separator 1 as viewed from the bottom side. FIG. 3 is a cross-sectional view showing the main part when the drain valve 15 of the water separator 1 is closed, and FIG. 4 is a cross-sectional view showing the main part when the drain valve 15 is open.

  In FIG. 1, a water separator 1 according to this embodiment is a self-ventilated type installed in a construction machine such as a hydraulic shovel, a wheel loader, or a bulldozer, and is disposed on a cup-shaped case 11 and an upper portion of the case 11. A screen 12, a pipe 14 </ b> A as an air conducting portion standing on the bottom 113 of the case 11, a ring-shaped float member 13 housed inside the case 11, and a drain valve 15 attached to the bottom 113 of the case 11 from below. It is configured. A pair of water separators 1 is provided with respect to the mounting member 20 in which the internal flow path is formed.

  The case 11 of the water separator 1 is made of a material such as acrylic resin that can be visually recognized from the outside, and the screen 12 is disposed in the opening 111 above the case 11. The screen 12 is sandwiched between the case 11 and the mounting member 20 by tightening the fastening ring 21 from below. A level line 112 is marked on the outer peripheral surface of the case 11. This level line 112 is a guideline for discharging water accumulated in the case 11.

  The screen 12 includes an annular member 121 provided on the upper portion, a filter 122 made of a metal mesh and a punching metal bonded to the bottom surface of the annular member 121, and a support member 123 bonded to the bottom surface of the filter 122. . An upper opening 124 is provided in the annular member 121. The support member 123 is provided with a clamping portion 123A that is sandwiched between the case 11 and the mounting member 20, and a channel portion 125 having a trapezoidal cross section that is located in the filter 122 and is expanded downward. Yes. Such a filter 122 combines water particles in fuel (for example, light oil) that has entered from the upper opening 124, thereby quickly separating pure fuel and water using their specific gravity difference. It is.

  The float member 13 is a member having a specific gravity intermediate between fuel and water, and is made of, for example, polyethylene resin. As a result, the float member 13 floats on the boundary surface between the fuel and water, and the operator can easily visually recognize the position of the boundary line between the fuel and water separated in the case 11. When the float member 13 reaches the level line 112, the operator opens the lower drain valve 15 and discharges the water accumulated on the lower side in the case 11. The material of the float member 13 is not limited to polyethylene resin, and may be any specific gravity that is intermediate between the specific gravity of fuel and water. Further, although the material is heavier than the specific gravity of water, the float member 13 may have a hollow structure that sinks into fuel and floats against water.

  The attachment member 20 is disposed in a fuel supply path from a fuel tank (not shown) to the engine, and an inflow path 202 that communicates an external inflow port 201 into which fuel from the fuel tank flows in and an internal outflow port 206 in which the screen 12 is accommodated. And an internal outlet 203 into which the fuel after water removal flows and an outflow path 205 that communicates the external outlet 204 to the fuel supply device side of the engine. The inflow path 202 and the outflow path 205 are provided in common by the pair of water separators 1.

  The fuel from the fuel tank flows from the first inlet 201 of the mounting member 20 through the inflow path 202, and then flows into the screen 12 from the upper opening 124 of the annular member 121, and passes through the filter 122 from the inside to the outside. And flows into the case 11. The fuel that has flowed into the case 11 is separated into pure fuel on the upper side in the case 11 and water on the lower side due to the difference in specific gravity. The fuel separated to the upper side enters the internal inflow port 203 through the flow path part 125, flows out from the internal inflow port 203 through the outflow passage 205, and flows out from the external outflow port 204, and is supplied to the fuel injection device on the engine side. Is done. Further, when the fuel and water begin to separate in the case 11, the float member 13 placed in the case 11 comes to be positioned at the boundary surface between the fuel and water.

The bottom 113 of the case 11 will be described with reference to FIGS.
In the center of the bottom 113, a drain hole 114 for discharging the separated water is provided so as to communicate vertically, and three recesses 115 are provided so as to surround the drain hole 114. Each recess 115 is recessed upward, and further, an air hole 116 penetrating through the bottom 113 is provided at the center of one recess 115A, and the lower end of the pipe 14A is formed above the air hole 116. Plugged in. The pipe 14A is fixed to the air hole 116 so as not to come off with an adhesive or the like. The shape of the opening of the recess 115 (viewed from below) is a long hole curved along the circumferential direction.

  The pipe 14 </ b> A is for guiding the air that enters the case 11 through the air hole 116 to the upper side when the drain valve 15 is opened. In the present embodiment, the upper end of the pipe 14 </ b> A is positioned in the flow path portion 125 of the screen 12, greatly exceeding the level line 112. When the drain valve 15 is closed, a part of the fuel that has flowed into the case 11 enters the pipe 14A and the air hole 116, and also collects in the recess 115A that communicates with the air hole 116. ing.

3 and 4, the drain valve 15 includes a valve main body 151 and a rubber cup 152 that is in close contact with the outer periphery of the bottom portion 113.
A screw part 153 for screwing into the drain hole 114 is provided at the upper part of the valve body 151, and an inverted T-shape for discharging water from the case 11 to the outside of the screw part 153 inside the screw part 153. A first drainage channel 154 having a shape is provided.

  In addition, an operation unit 150 is provided on the lower side of the valve main body 151, and a T-shape that draws water flowing out from the first drainage channel 154 into the operation unit 150 and discharges it from below the operation unit 150. A second drainage channel 155 as a drainage channel is provided. In this embodiment, the second drainage channel 155 and the first drainage channel 154 form the drainage channel of the present invention.

  An O-ring 156 is disposed on the step formed on the outer periphery of the valve body 151. When the valve body 151 is closed, the O-ring 156 is located between the tapered surface on the bottom 113 side and the step on the valve body 151 side. To prevent fuel leakage from the inside of the case 11.

  The rubber cup 152 is in close contact with the outer periphery of the bottom portion 113 when the drain valve 15 is closed, prevents dust and dirt from adhering to the bottom portion 113, and has a function of receiving water flowing out from the first drainage channel 154. is doing.

  Here, referring to FIG. 2, the long diameter D of the recess 115 </ b> A formed in the shape of a long hole is much larger than the flow path diameter d of the first drainage channel 154. Therefore, even when the draining direction of the drain valve 15 causes the outflow direction of the water discharged from the first drainage channel 154 to overlap the opening position on the lower end side of the air hole 116, the air hole 116 is blocked by the flow of water. There is no risk of peeling, and air is taken in more smoothly from both ends of the elongated hole-like recess 115A. Further, since the recess 115A is recessed upward, when the drain valve 15 is opened, the fuel stored in the recess 115A is first discharged before the fuel stored in the first drainage channel 154 is discharged. This is because the fuel accumulated in the first drainage channel 154 is in an unstable state due to its own weight.

Next, with reference to FIG. 4, how the water is discharged when the drain valve 15 is opened in the present embodiment will be described.
When the float member 13 rises and water is accumulated in the case 11, the operator opens the drain valve 15. When the drain valve 15 is opened, the watertight state by the O-ring 156 is released, and a gap is formed between the step portion of the valve main body 151 and the bottom portion 113. First, fuel accumulated in the recess 115 </ b> A below the air hole 116 flows out of the valve body 151 instantaneously through the gap, and is discharged downward through the second drainage channel 155.

  As a result, the outside and the pipe 14A communicate with each other through the recess 115A, air enters the pipe 14A from the outside, and the fuel accumulated in the pipe 14A is returned upward by the air and returned into the case 11. Then, the water accumulated on the lower side in the case 11 is discharged through the first drainage channel 154 and the second drainage channel 155 instead of the air continuously taken in through the pipe 14A. At this time, the upper end of the pipe 14A is located in the screen 12, and since the taken-in air is guided upward where only pure fuel exists, water and fuel are agitated by bubbles generated by the air. And only water can be discharged reliably. As a result, work hygiene can be improved.

[Second Embodiment]
FIG. 5 is a view showing a water separator 1 according to a second embodiment of the present invention.
A configuration different from the water separator 1 of the first embodiment will be described with reference to FIG. In the present embodiment, the air conduction portion 14B is formed integrally with the case 11 along the inner wall of the case 11 from the recess 115A. The upper end of the air conducting portion 14B is located above the level line 112.

  Also in the present embodiment, as in the first embodiment, when the float member 13 rises and water begins to accumulate in the case 11, the drain valve 15 is opened and drained. When this drain valve 15 is opened, air entering from the outside passes through the air conduction portion 14B. At this time, since the upper end of the air conducting portion 14B is located above the level line 112, air can be guided upward from the level line 112. Accordingly, the fuel and water separated in the case 11 are not stirred, and only water can be reliably discharged, and the same effect as in the first embodiment can be achieved.

  In addition, the pipe 14A in the first embodiment needs to be fixed to the air hole 116. However, in this embodiment, the air conducting portion 14B is formed integrally with the case 11, so that the assemblability is improved. Can do. Further, since it is not necessary to use a member such as the pipe 14A, the number of parts can be reduced.

The present invention is not limited to the above-described embodiment, and includes other configurations that can achieve the object of the present invention, and includes the following modifications and the like.
For example, a plurality of pipes 14A and air conducting portions 14B may be provided. According to this, since much air can be taken in, the discharge speed of water can be increased.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a construction machine or the like that needs to remove moisture in fuel.

The front view which shows the water separator of 1st Embodiment which concerns on this invention. The bottom view of the case which concerns on 1st Embodiment. Sectional view showing the main parts when the drain plug is closed Sectional drawing which shows the principal part when a drain plug is opened Sectional drawing which shows the water separator of 2nd Embodiment. The front view which shows the conventional water separator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Water separator, 11 ... Case, 12 ... Screen, 13 ... Float member, 14A ... Pipe which is an air conduction part, 14B ... Air conduction part, 15 ... Drain valve, 112 ... Level line, 113 ... Bottom part, 114 ... Drainage Holes 115, recessed portions 116 air holes 153 screw portions 154 first drainage channels that are drainage channels 155 second drainage channels that are drainage channels

Claims (3)

A water separator that separates fuel and water,
A case with a level line on the circumference,
An air conducting portion provided inside the case and communicating with the outside through the bottom of the case;
A drain valve attached to the bottom of the case and having a drainage channel for discharging water,
The upper end of the air conduction part is opened above the level line ,
The bottom portion of the case is provided with a long hole-shaped recess that opens downward and communicates with the air conduction portion.
The water separator according to claim 1, wherein a major axis of the recess is larger than a channel diameter of the drainage channel . The water separator according to claim 1 ,
The water recess is characterized in that the recess is formed to be depressed upward. The water separator according to claim 1 or 2 ,
A screen with a filter is arranged at the top in the case,
A water separator, wherein an upper end of the air conducting portion is located in the screen.

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