JP6410441B2 - Fuel filter device - Google Patents

Description

  The present invention relates to a fuel filter device provided in a supply flow path for supplying fuel from a fuel tank to an engine.

  Some engines of power machines that operate using light oil, kerosene, gasoline, or the like as fuel are provided with a fuel injection supply system that supplies fuel in a mist form into a cylinder or into an intake port. This fuel injection supply system includes a fuel tank, a fuel pump, and an injection nozzle (injector). The fuel supply flow path connecting the fuel tank and the fuel pump captures foreign matters such as dust and dust contained in the fuel. A fuel filter device for removal is provided. In such a fuel filter device, the foreign matter removal capability is reduced due to clogging of the filter medium of the filter element, and in this case, the filter element is replaced with a new filter element. There is known a fuel filter device including a priming pump that performs a priming operation for extracting air in the filter device when the filter element is replaced with a new one and fills the filter device with fuel (see, for example, Patent Document 1). .

JP 2006-37801 A

  In such a conventional fuel filter device, the filter case housing the filter element is fixed to the vehicle body or the machine base, and when replacing the filter element, the filter head screwed to the filter case is removed. It has become. However, in the conventional fuel filter device, a priming pump is provided above the filter head to facilitate the priming operation. A fuel inlet and outlet are formed in the filter head, and a supply pipe from the fuel tank and a supply pipe to the fuel pump are connected to the filter head. Therefore, when the filter element is replaced, first, the supply pipe to the fuel tank and the fuel pump is removed from the filter head, and then the filter head is rotated with respect to the filter case and removed from the filter case. Therefore, there is a problem that it takes time to replace the filter element. Furthermore, there is a problem of fuel leakage because it is necessary to remove the supply pipe from the filter head. In the case of a filter device in which the filter head is attached to the filter case by a ring nut, the supply pipe does not have to be removed from the filter head, but the range in which the filter head can be moved by the supply pipe is limited. There was a problem that it was difficult to replace the filter element.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a fuel filter device capable of easily replacing a filter element.

In order to achieve the above object, a fuel filter device according to the present invention is detachably attached to a filter case having an element arrangement space opened on one side and an opening of the element arrangement space. A filter head and a cylindrical filter element that is provided in the element arrangement space and bisects the element arrangement space into an inflow space and an outflow space, and the filter case is fixed to a predetermined base member. In addition, the filter case includes a fuel inlet and outlet, an inlet pipe extending upward from the inlet through the outlet space inside the filter element, and from the outlet space to the outlet. and a outflow pipe section connected, the portion of the inlet pipe section is provided so as to pass through the outlet pipe portion, a portion of the inlet pipe section and the outlet pipe portion Ru is configured in a double pipe structure. A priming pump is provided in the filter head that is screwed into and detachable from the filter case fixed to the base member, and an upper end opening of the inflow pipe portion is connected to an inlet of the priming pump, and the priming pump Is connected to the inflow space through an in-head flow passage formed in the filter head .

  According to the fuel filter device of the present invention, the inlet and the outlet are formed in the filter case fixed to the vehicle body or the machine base, and the supply pipe from the fuel tank and the supply pipe to the fuel pump are connected to the filter case. It is configured to be. On the other hand, the filter head is provided with a priming pump. Therefore, when exchanging the filter element, it is only necessary to remove the filter head provided with the priming pump from the filter case, and it is not necessary to remove the fuel tank and the supply pipe to the fuel pump. Further, the range in which the filter head can be moved by the supply pipe is not limited. Therefore, the filter element can be easily replaced. Further, there is no risk of fuel leakage due to removal of the supply pipe.

Further, since a part of the inlet pipe portion of the full Irutakesu is provided so as to pass through the outlet pipe portion, a portion of the inlet tube portion and outlet tube portion is formed in a double pipe structure, the inlet pipe section and The filter device can be made smaller than the configuration in which the outflow pipe portions are provided at different positions.

It is a simplified lineblock diagram of a fuel injection supply system provided with a fuel filter device concerning the present invention. It is sectional drawing of the fuel filter apparatus which concerns on this invention. It is the side view seen from the inflow port and outflow port side of the fuel filter device concerning the present invention. It is the side view seen from the opposite side of the inflow port and outflow port of the fuel filter apparatus which concerns on this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a simplified configuration of an engine fuel injection supply system including a fuel filter device 1 according to the present invention.

  This fuel injection supply system includes a fuel tank T that stores fuel, a fuel pump P that pumps fuel, and an injection nozzle that atomizes the fuel pumped by the fuel pump P and injects it into an air supply pipe or combustion chamber of an engine. N (injector), and a fuel filter device 1 that is provided in a fuel supply passage that connects the fuel tank T and the fuel pump P and that supplements and removes foreign matters such as dust contained in the fuel from the fuel tank T. Has been.

  As shown in FIGS. 2 to 4, the fuel filter device 1 is detachably screwed to the filter case 30 so as to close the element arrangement space 10 and a filter case 30 having an element arrangement space 10 therein. The filter head 20 is configured to have a filter element 40 that extends in the vertical direction in the filter case 30 (element disposition space 10). In the following, the directions of the up and down and left and right arrows shown in FIG. 2 will be described as the up and down direction and the left and right direction.

  The filter case 30 is formed in a bottomed cylindrical shape that opens upward, and is configured such that the filter element 40 is disposed in the internal element disposition space 10. At the lower part of the outer side surface of the filter case 30, an inflow side connection part 31 to which a fuel supply pipe connected to the fuel tank T is connected, and an outflow side connection part 32 to which a fuel supply pipe connected to the fuel pump P is connected, Are formed so as to protrude from the side surface of the filter case 30 side by side. The outflow side connection portion 32 is formed above the inflow side connection portion 31. An inflow port 31 a is formed at the distal end portion of the inflow side connection portion 31, and an outflow port 32 a is formed at the distal end portion of the outflow side connection portion 32.

  In the center of the inner bottom portion of the filter case 30, a cylindrical flow path forming portion 33 that extends upward to the upper portion of the element disposition space 10 is formed. A cylindrical channel forming pipe 34 extending in the vertical direction is provided inside the channel forming unit 33. The upper end portion of the flow path forming pipe 34 extends to be higher than the upper end portion of the flow path forming portion 33. A flow path is formed in the filter case 30 so that the lower end opening of the flow path forming pipe 34 and the inflow port 31 a communicate with each other, and an inflow path 35 is formed by the internal space of the flow path and the flow path forming pipe 34. Has been. In addition, the filter case 30 has a flow path such that a ring-shaped space formed by the inner peripheral surface of the flow path forming portion 33 and the outer peripheral surface of the flow path forming pipe 34 and extending in the vertical direction communicates with the outlet 32a. The outflow path 36 is formed by the ring-shaped space and the flow path. In this way, a part of the inflow path 35 and the outflow path 36 is configured in a double tube structure by the flow path forming portion 33 and the flow path forming pipe 34. A dust cover 39 is provided at the ring-shaped upper end opening of the flow path forming portion 33 to prevent foreign matters such as dust from entering the outflow passage 36 when the filter element 40 is replaced, for example.

  A water level sensor 37 is provided on the inner bottom of the filter case 30. The water level sensor 37 includes a shaft portion 37a that includes a reed switch and extends upward, and a ring-shaped float 37b that includes a magnet and is provided on the shaft portion 37a so as to be movable up and down. The float 37 b is formed of foam rubber or foam resin, and moves up and down along the shaft portion 37 a according to the height of the water surface accumulated at the inner bottom of the filter case 30. The water level sensor 37 is configured to detect when the amount of water accumulated in the inner bottom portion of the filter case 30 reaches a predetermined amount by detecting the position of the float 37b with a reed switch.

  A mounting bracket 38 for fixing the filter case 30 to a vehicle body, a machine base or the like is provided at a position on the outer side surface of the filter case 30 opposite to the inflow side and outflow side connection portions 31 and 32. The filter case 30 is fixed to the vehicle body or the machine base via the mounting bracket 38.

  A male screw 30a is formed at the upper part of the outer peripheral surface of the filter case 30, and the female screw 21 formed at the lower part of the inner peripheral surface of the filter head 20 is screwed into the male screw 30a, so that the filter head 20 is in the filter case. 30 is detachably attached.

  The filter head 20 is formed in a substantially conical shape, and an upper end portion thereof opens upward, and a priming pump 50 is provided so as to close the opening. Inside the filter head 20, an in-head flow path 22 is formed that communicates the inflow path 35 (the upper end opening of the flow path forming pipe 34) and the element arrangement space 10 (an inflow space 10 a described later). The priming pump 50 is provided in the middle of the in-head flow path 22.

  The priming pump 50 is configured by a diaphragm pump in this embodiment, and a circular lid-like pump body 51 attached to the filter head 20 so as to close the upper end opening of the filter head 20, and a central portion of the pump body 51. A cylindrical operation part 52 which is inserted into a through hole formed so as to penetrate vertically and is provided so as to be movable in the vertical direction with respect to the pump main body 51, a lower end outer peripheral part of the operation part 52, and an upper end part of the filter head 20 And a rubber diaphragm 53 that closes the upper end opening of the filter head 20 in the pump body 51 and a spring 54 that urges the operating portion 52 upward.

  The filter element 40 includes an inner cylinder 41 formed in a cylindrical shape by a lattice-shaped frame member, a filter medium 42 having a cross-shaped chrysanthemum shape that is bent and wound around the inner cylinder 41, and the inner cylinder 41 and the filter medium. The disk-shaped upper plate 43 attached to the upper end of 42 and the disk-shaped lower plate 44 attached to the lower ends of the inner cylinder 41 and the filter medium 42 are configured. The inner cylinder 41 and the filter medium 42 are sandwiched between the upper and lower plates 43 and 44, and an inner space surrounded by the inner peripheral surface of the inner cylinder 41 and both the plates 43 and 44 is formed. When the filter element 40 is arranged in the element arrangement space 10 in the filter case 30, the element arrangement space 10 is a space outside the filter medium 42 (referred to as an inflow space 10 a) and an inner space of the inner cylinder 41. (This is called the outflow space 10b).

  In the central portion of the upper plate 43, an opening 43a communicating with the internal space of the inner cylinder 41 is vertically formed. An opening 44 a that communicates with the internal space of the inner cylinder 41 is also formed vertically through the center of the lower plate 44. When the filter element 40 is arranged in the element arrangement space 10 of the filter case 30, the flow path forming part 33 of the filter case 30 is inserted into the opening 44 a of the lower plate 44, and the upper end opening of the flow path forming part 33 is the filter element 40. It is located in the interior space (outflow space 10b). Further, the flow path forming pipe 34 is inserted into the opening 43 a of the upper plate 43, and the upper end opening of the flow path forming pipe 34 is located above the upper plate 43 and is connected to the in-head flow path 22 of the filter head 20. It has become.

  A ring-shaped seal member 45 is provided at a contact portion between the outer peripheral surface of the flow path forming portion 33 and the opening 44a of the lower plate 44, and the seal member 45 allows the inside of the element arrangement space 10 (inflow space 10a). Is prevented from entering the internal space (outflow space 10b) of the filter element 40 from the corresponding contact portion. Further, a ring-shaped seal member 46 is also provided at a contact portion between the outer peripheral surface of the flow path forming pipe 34 and the opening 43 a of the upper plate 43, and the fuel in the in-head flow path 22 is caused by the seal member 46. Intrusion into the internal space (outflow space 10b) of the filter element 40 from the contact portion is prevented.

  A plurality of through holes 43b penetrating up and down are formed side by side in the circumferential direction at a position on the end side of the upper plate 43. When the filter element 40 is arranged in the element arrangement space 10 of the filter case 30 and the filter head 20 is attached to the filter case 30, the flow path in the head 22 of the filter head 20 and the elements are arranged via the flow holes 43 b. The space 10 (inflow space 10a) communicates. A ring-shaped seal member 47 is provided at the outer peripheral end of the upper plate 43. When the filter head 20 is attached to the filter case 30, the outer peripheral end of the upper plate 43 and the seal member 47 are sandwiched between the filter head 20 and the filter case 30, and the fuel in the element disposition space 10 leaks to the outside by the seal member 47. It prevents it from being put out. A pull tab 48 that is an operation unit for pulling out the filter element 40 from the filter head 30 after the filter head 20 is removed from the filter case 30 is provided at the upper surface end of the upper plate 43.

  In the present embodiment, the filter medium 42 bent in a bellows shape is wound around the inner cylinder 41, but the filter medium is not limited to such a configuration. For example, it may be constituted by a glass fiber having a predetermined thickness, a non-woven fabric formed in a cylindrical shape, a combination of these materials, or a sintered product formed in a cylindrical shape. Depending on the fuel to be filtered, foreign matter to be removed, etc., the material and shape can be optimized.

  In the fuel filter device 1 configured as described above, as indicated by an arrow in FIG. 2, the fuel from the fuel tank T sucked from the inlet 31a by the suction force of the fuel pump P (see FIG. 1) flows in. It flows into the in-head flow path 22 in the filter head 20 through the flow path in the side connection portion 31 and the inflow path 35 formed by the internal space of the flow path forming pipe 34. Then, it flows into the element arrangement space 10 (inflow space 10a) in the filter case 30 from the in-head flow path 22 through the plurality of flow holes 43a of the upper plate 43 of the filter element 40, and the filter medium 42 of the filter element 40 is removed. It passes through and flows into the internal space (outflow space 10b) of the filter element 40. Then, it flows from the outflow space 10 b through the outflow path 36 formed by the space formed by the inner peripheral surface of the flow path forming portion 33 and the outer peripheral surface of the flow path forming pipe 34 and the flow path in the outflow side connection portion 32. Fuel is supplied from the outlet 32a toward the fuel pump P.

  In such a fuel filter device 1, the foreign matter removing ability is reduced due to clogging of the filter medium 42 of the filter element 40. In this case, the filter element 40 is replaced with a new filter element 40. When the filter element 40 is replaced, the filter head 20 is rotated and removed from the filter case 30 fixed to the vehicle body or the machine base. Then, the filter element 40 is removed from the filter case 30 by pulling out the filter element 40 using the pull tab 48 provided on the upper plate 43 of the filter element 40. Then, a new filter element 40 is disposed in the filter case 30, and the filter head 20 is screwed to the filter case 30. At this time, since not fuel but air is contained in the fuel filter device 1, the priming pump 50 is operated to remove this air.

  When the operating portion 52 of the priming pump 50 is manually pushed down, the diaphragm 53 is pushed down, and then when the diaphragm 53 is pushed up by the repulsive force of the spring 54, a suction force for sucking fuel from the fuel tank T from the inlet 31a is generated. . Thus, the fuel sucked from the inflow port 31a by the suction force generated by repeatedly moving the diaphragm 53 up and down passes through the inflow passage 35 and the in-head passage 22 into the element arrangement space 10 (inflow space 10a). After flowing in and passing through the filter medium 42 of the filter element 40, it flows out from the outlet 32 a through the outlet path 36. In this way, the fuel filter device 1 is filled with fuel when the filter is replaced.

  As described above, according to the fuel filter device 1, the inflow side connection portion 31 (inflow port 31 a) and the outflow side connection portion 32 (outflow port 32 a) are formed in the filter case 30 fixed to the vehicle body or the machine base. A supply pipe from the fuel tank T and a supply pipe to the fuel pump P are connected to the filter case 30. On the other hand, the filter head 20 is provided with a priming pump 50. Therefore, when exchanging the filter element 40, it is only necessary to remove the filter head 20 provided with the priming pump 50 from the filter case 30, and it is not necessary to remove the supply pipes to the fuel tank T and the fuel pump P (these supplies). The tube may remain connected to the filter case 30). Further, the range in which the filter head 20 can be moved by the supply pipe is not limited. Therefore, the replacement work of the filter element 40 can be easily performed. Further, there is no risk of fuel leakage due to removal of the supply pipe.

  A cylindrical flow path forming portion 33 extending upward is formed at the inner bottom of the filter case 30, and a flow path forming pipe 34 extending upward is provided in the flow path forming portion 33. An inflow path 35 is formed by the flow path connected from the inflow port 31a and the internal space of the flow path forming pipe 34, and is formed by the inner peripheral surface of the flow path forming portion 33 and the outer peripheral surface of the flow path forming pipe 34. An outflow path 36 is formed by a ring-shaped space extending in the direction and a flow path connected to the outflow path 32a. In this way, a part of the inflow path 35 and the outflow path 36 is configured in a double tube structure by the flow path forming portion 33 and the flow path forming pipe 34. Therefore, the fuel filter device can be made smaller than the configuration in which the inflow path and the outflow path are formed at different positions.

  Although the embodiment according to the present invention has been described so far, the scope of the present invention is not limited to that shown in the above-described embodiment. For example, in the above-described embodiment, the priming pump 50 is configured by a diaphragm pump, but may be configured by another type of pump.

DESCRIPTION OF SYMBOLS 1 Fuel filter apparatus 10 Element arrangement | positioning space 10a Inflow space 10b Outflow space 20 Filter head 22 In-head flow path 30 Filter case 31 Inflow side connection part 31a Inlet 32 Outlet side connection 32a Outlet 35 Inflow path 36 Outflow path 40 Filter Element 50 Priming pump

Claims (1)

A filter case having an element arrangement space opened on one side;
A filter head detachably attached to the filter case so as to close the opening of the element arrangement space;
A cylindrical filter element that is provided in the element arrangement space and bisects the element arrangement space into an inflow space and an outflow space;
In the fuel filter device in which the filter case is fixed to a predetermined base member,
The filter case includes an inlet and an outlet of fuel, an inflow pipe portion extending upward from the inflow port through the outflow space inside the filter element, and an outflow pipe portion connected from the outflow space to the outflow port. And
A part of the inflow pipe part is provided so as to pass through the outflow pipe part, and the inflow pipe part and a part of the outflow pipe part are configured in a double pipe structure,
A priming pump is provided on the filter head that is screwed into and detachable from the filter case fixed to the base member;
An upper end opening of the inflow pipe portion is connected to an inlet of the priming pump, and an outlet of the priming pump is communicated with the inflow space through an in-head flow path formed in the filter head. Fuel filter device.

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