JP3001443U - Fluid filter - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a fluid filter capable of sufficiently removing impurities in a fluid. [Structure] The filter element 10 is detachably held in the insertion spaces 25 and 35, and the inflow hole 21a is formed.
The fluid that has flowed in from passes through the filter element 10 and flows out from the outflow hole 21b. In addition, the filter element 10 forms the inner tube 12 and the outer tube 13 so as to be separable by the tube member engaging mechanism so that the inner tube 12 and the outer tube 13 have an outer surface and a filter material holding space between the outer surface and the inner surface. And the filter medium 11 is inserted and held in this filter medium holding space. Accordingly, the filter element 10 can be easily attached to and detached from the insertion space formed by the mount body 20 and the filter case 30, and the filter medium 11 can be easily attached and detached, and the filter medium 11 can be easily replaced. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid filter used for filtering a fluid such as removal of water mixed in fuel.

[0002]

[Prior art]

 In engines and the like, if the fuel to be burned contains impurities such as water and dust, there is a problem that incomplete combustion of the fuel will occur and the wear of the sliding parts will increase. In addition, when a plunger pump is used as the fuel injection pump, the impurities mixed in the fuel are removed because the moisture mixed in the fuel may cause the plunger to rust and dust may cause the plunger to malfunction. In order to do so, a fuel filter as shown in FIG. 6 is provided to filter the fuel.

This fuel filter includes a mount body 60 having an inflow hole 61a and an outflow hole 61b in a body body 61, a filter case 70 having a screw portion 71d screwed into a screw portion 61d of the mount body 60, and a mount body. 60 and the filter case 70, and the filter element 50 disposed in the insertion spaces 65 and 75 formed when the filter case 70 is screwed.

The filter element 50 is composed of a filter medium 51, an outer tube 53, and a bush 54. The filter medium 51 is formed of a cylindrical wire mesh of about 80 to 100 mesh, and is inserted into the outer tube 53 formed in a cylindrical shape by a punching plate having a plurality of through holes, so that the force of the inflowing fuel can be improved. It is constructed so as to maintain a cylindrical shape. The outer tube 53 is composed of a tubular portion 53a and an upper plate 53b covering the upper portion of the tubular portion 53a, and an inflow hole 61a is formed in a through hole of a bush 54 provided in the central portion of the upper plate 53b. The inflow pipe 61c thus prepared is inserted.

As a result, the fuel that has flowed in through the inflow hole 61a flows inside the filter element 50 as shown by the arrow, passes through the filter medium 51 to remove impurities, and the fuel from which water has been bled off is removed. It will flow out from the outflow hole 61b. In addition, the splashed water drops into the insertion space 75 through a drain hole 72b formed above the lower plate 72a of the filter element holding member 72 that holds the filter element 50 in the insertion space 75, and is stored therein. It

[0006]

[Problems to be solved by the device]

 Here, especially in recent diesel engines, the high pressure injection of fuel is performed as a measure against exhaust gas, so the clearance between the plunger and the cylinder in the plunger pump is reduced, and the plunger is caught even if some rust or impurities occur. It is easy to occur. However, since it was necessary to increase the flow rate of the fuel pump with the high-pressure injection of fuel, the problem that the fuel filter with the above configuration cannot sufficiently remove water and other impurities in the fuel was there.

The present invention has been made in view of such problems, and an object thereof is to provide a fluid filter capable of sufficiently removing impurities in a fluid.

[0008]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the fluid filter of the present invention is provided with a detachable filter case on a mount body, and a filter element is detachably held in an insertion space surrounded by the mount body and the filter case. Is configured as follows. Then, the fluid that has flowed in through the inflow hole provided in the mount body passes through the filter element and flows out through the outflow hole. The filter element is formed by the tube member engaging mechanism so as to be engaged and separated by itself, and has an outer tube having an outer diameter and an outer tube having a predetermined inner diameter larger than a predetermined outer diameter of the inner tube. The filter medium holding space is formed between the inner surface and the inner surface of the. A cylindrical filter medium is inserted and held in the filter medium holding space.

Accordingly, the filter element can be easily attached to and detached from the insertion space formed by the mount body and the filter case. Further, in the filter element, since the filter medium is held in the filter medium holding space, the filter medium is exposed by removing the outer tube from the inner tube. This facilitates the attachment / detachment of the filter medium to / from the inner tube, so that when the filter medium becomes dirty, the filter medium can be easily washed or the filter medium can be replaced.

Here, in the filter element including the tube member engaging mechanism including the engaging protrusion and the engaging groove engaging with the engaging protrusion, the outer tube is press-fitted into the inner tube. As a result, the engagement protrusion and the engagement groove are engaged with each other, so that the inner tube and the outer tube can be easily engaged with each other. Also, when removing the outer tube from the inner tube, it is sufficient to pull the outer tube, which facilitates disassembly and assembly of the filter element.

Further, even when the outer tube is rotated with respect to the inner tube so that the engaging projection is positioned in the engaging groove so that the inner tube and the outer tube are engaged with each other, By rotating the filter element, the filter element can be easily disassembled and assembled.

In the filter element of each of the above filter elements, which is formed of a non-woven fabric using chemical fibers, the pressure loss is small, impurities can be removed efficiently, and the filter element is contaminated. In some cases, it can be reused by washing, which is economical.

[0013]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the structure of a fuel filter, which is one of the embodiments of the present invention, will be described with reference to FIGS. 1 and 2. This fuel filter includes a filter element 10, a mount body 20, and a filter case 30. The mount body 20 is formed with an inflow pipe 21c extending downward inward at the center of a body body 21 formed in a cylindrical shape with a lid, and an inflow hole 21a is formed in the inflow pipe 21c. An outflow hole 21b is formed in the side surface of the body body 21 so as to penetrate the side surface, and connects the space 25 formed inside the body body 21 to the outside of the fuel filter.

A screw portion 21 d is formed on the outer periphery of the lower end portion of the mount body 20. The screw portion 21d is formed so as to be screwed with the screw portion 31d formed on the inner circumference of the upper end portion of the case body 31 of the filter case 30. In the screwed state of these screw portions 21d and 31d, the insertion spaces 25 and 35 are formed inside the mount body 20 and the filter case 30, and the filter element 10 is arranged in this space. When the mount body 20 and the filter case 30 are screwed together, the seal member 39 provided on the upper surface of the filter case body 31 securely screwes them together without any gap.

A filter element holding member 32 for holding the filter element 10 in the insertion spaces 25, 35 is provided in the filter case 30. The filter element holding member 32 is composed of an upper plate 32a, side plates 32b, and a bottom portion 32c. The side plate 32b is fixed to the upper plate 32a and a flange portion is formed. By mounting the flange portion on the upper end portion of the filter case, the filter element holding member 32 is positioned in the insertion space 35. Let A bottom portion 32c is fixed to the lower end portion of the side plate 32b, and a recess portion for mounting the filter element 10 is formed in the center portion of the bottom portion 32c. Further, a drain hole 32d is formed on the bottom surface of the bottom portion 32c on the outer peripheral side, and is configured to drain the water stored in the bottom portion 32c.

Next, the filter element 10 will be described with reference to FIGS. 3 and 4. The filter element 10 is composed of a filter medium 11, an inner tube 12, and an outer tube 13. A non-woven fabric formed in a cylindrical shape is used as the filter medium 11, and an inner tube 12 whose details will be described later is inserted into the inner periphery of the filter medium 11.

The inner tube 12 is composed of a tubular portion 12a and an upper plate 12b. The cylindrical portion 12a is formed with a plurality of through holes so that the fuel to be filtered can pass therethrough, and can hold the cylindrical shape of the filter medium 11 so as not to be deformed when the fuel passes. A punching plate having a plurality of through holes having rigidity is formed into a cylindrical shape having an outer diameter (predetermined outer diameter) that can be fitted into the inner diameter of the filter medium 11. The upper plate 12b is formed so as to cover the upper end of the tubular portion 12a and is fixed to the tubular portion 12a. The bush 14 shown in FIGS. 1 and 2 is attached to the center of the upper plate 12b, and the inflowing fuel is introduced by inserting the inflow pipe 21c into the through hole provided in the center of the bush 14. The filter element 10 can be firmly held in the insertion space 25 so as to prevent leakage. Further, on the outer periphery of the upper plate 12b, there is formed an engagement groove 12c with which an engagement protrusion 13c formed on an upper end portion of an outer tube 13 whose details will be described later engage.

The outer tube 13 is composed of a tubular portion 13a and a lower plate 13b. The tubular portion 13a is formed in a cylindrical shape by a punching plate similar to the tubular portion 12a of the inner tube 12, and has an inner diameter (predetermined inner diameter) larger than the outer diameter of the filter medium 11. An engagement protrusion 13c is formed on the upper end of the tubular portion 13a so as to project to the outside of the tubular portion 13a. The lower plate 13b is formed so as to cover the lower end portion of the tubular portion 13a, and has a bottom portion 13d for holding the filter medium 11 so as not to drop when the inner tube 12 and the outer tube 13 are engaged with each other.

In the filter element 10 configured as described above, the filter medium 11 is inserted into the outer surface of the inner tube 12, and then the outer tube 13 is inserted into the outer surface of the filter medium 11. Then, as shown by the alternate long and short dash line in FIG. 4, by pushing the outer tube 13 toward the inner tube 12, the engagement protrusion 13c is engaged with the engagement groove 12c. As a result, the filter medium 11 is firmly held in the filter medium holding space formed between the inner tube 12 and the outer tube.

Then, the filter element 10 is placed on the bottom portion 32c of the filter element holding member 32 arranged in the filter case 30. Then, the outflow pipe 21c is aligned with the central portion of the bush 14, the mount body 20 is covered on the filter element 10, and the mount body 20 is rotated to screw the screw portions 21d and 31d. At this time, the seal member 39 is screwed in firmly so that fuel does not leak between the mount body 20 and the filter case 30 due to the action of the seal member 39. As a result, the filter element 10 is held in the insertion spaces 25 and 35 formed inside the mount body 20 and the filter case 30.

According to the fuel filter thus configured, the fuel flowing from the inflow hole 21a passes through the inner tube 12 as shown by the arrow in FIG. 1, and impurities are removed by the filter medium 11 and Moisture mixed in the fuel is thrown off. The fuel that has passed through the filter medium 11 passes through the outer tube 13 and flows out from the outflow hole 21b toward the engine or the like. The splashed water is collected in the bottom portion 32c of the filter element holding member 32, then falls from the drain hole 32d into the insertion space 35 of the filter case 30, and is collected in the filter case body 31. When a predetermined amount of water is collected, the drain plug 33 is loosened and the water is drained from the filter case 30.

When the filter medium 11 becomes dirty, the mount body 20 is removed from the filter case 30 and the filter element 10 is taken out from the insertion spaces 25 and 35. Next, the filter medium 11 is exposed by pulling out the outer tube 13 from the inner tube 12, and the filter medium 11 is removed from the inner tube 12 to wash or replace the filter medium 11.

Here, when the filter medium 11 is a non-woven fabric using glass fiber, it has a high separation performance capable of separating the fuel and the water even if the water content of the fuel is fine particles (emulsion state). However, glass fiber has a high pressure loss and cannot be reused because it cannot be washed, and it may not be optimal for some uses as a fuel filter. Therefore, a non-woven fabric using chemical fibers may be used as the filter medium 11. As a chemical fiber for a fuel filter, a synthetic nonwoven fabric of polyester and rayon is suitable.

When the filter medium 11 is formed of the non-woven fabric using such a chemical fiber, sufficient filtration performance (water separation performance) is obtained even if the fuel flow velocity is high, although the pressure loss is small. be able to. Therefore, a fuel filter can be provided on the suction side of the fuel pump, and it is possible to prevent impurities from entering the fuel pump. Further, when the filter medium 11 becomes dirty, it can be washed and reused, which is economical.

In the above embodiment, the tube member engagement mechanism for holding the outer tube 13 with respect to the inner tube 12 is composed of the engagement protrusion 13c and the engagement groove 12c. A tube member engaging mechanism as shown in FIG. 5 may be used as a tube member engaging mechanism having another configuration. The tube member engaging mechanism is formed so as to project inside the outer peripheral side surface of the upper plate 42b formed so as to cover the upper end portion of the tubular portion 42a in the filter element 40 configured almost the same as the filter element 10. The engaging protrusion 42c and the engaging groove 43c formed at the upper end of the tubular portion 43a. The engagement groove 43c is a long hole having an open upper end, and is formed so as to be inclined downward.

According to the filter element 40 thus formed, when the outer tube 43 is held with respect to the inner tube 42, the engaging protrusion 42c is located at the opening of the engaging groove 43c. Then, the outer tube 43 is screwed onto the inner tube 42 by rotating the outer tube 43 clockwise. Further, when removing the outer tube 43, the outer tube 43 may be rotated counterclockwise. Therefore, like the filter element 10, the outer tube 43 can be easily attached and detached, so that the filter medium 11 held between them can be easily attached and detached.

[0027]

[Effect of device]

 As described above, the fluid filter according to the present invention is configured such that the filter element is detachably held in the insertion space in the mount body and the filter case, and the fluid flowing in from the inflow hole provided in the mount body is It is constructed so as to pass through the filter element and flow out from the outflow hole. The filter element forms a filter medium holding space between the outer surface of the inner tube and the inner surface of the outer tube while engaging and separating the inner tube and the outer tube by the tube member engaging mechanism. The filter medium is inserted and held in this filter medium holding space.

With this, the filter element can be easily attached to and detached from the insertion space formed by the mount body and the filter case, and the filter medium is held between the outer tube and the inner tube. The filter medium can be easily attached and detached, and even when the filter medium becomes dirty, the filter medium can be easily washed or replaced.

Here, in the filter element including the tube member engaging mechanism including the engaging protrusion and the engaging groove engaging with the engaging protrusion, the outer tube is press-fitted into the inner tube. As a result, the outer tube can be held against the inner tube, and the outer tube can be removed from the inner tube by pulling the outer tube, which facilitates disassembly and assembly of the filter element.

Furthermore, even in the case where the outer tube is rotated with respect to the inner tube so that the engaging protrusion is positioned in the engaging groove to hold the outer tube with respect to the inner tube, By rotating the, it is possible to easily disassemble and assemble the filter element.

When the filter medium is formed of a non-woven fabric using chemical fibers, the pressure loss is small, impurities can be removed efficiently, and the filter medium is washed when it becomes dirty. Since it can be repeatedly used, a high-performance and economical fluid filter can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluid filter according to the present invention.

FIG. 2 is a perspective view of the fluid filter.

FIG. 3 is a perspective view of a filter element in the fluid filter.

FIG. 4 is a partial cross-sectional view of a filter element in the fluid filter.

FIG. 5 is a partial cross-sectional view of a filter element in the fluid filter.

FIG. 6 is a cross-sectional view of a conventional fluid filter.

[Explanation of symbols]

 10, 40, 50 Filter element 11, 41, 51 Filter medium 12, 42 Inner tube 13, 43 Outer tube 20, 60 Mount body 30, 70 Filter case

Claims (4)

[Scope of utility model registration request] 1. A mount body having a fluid inflow hole and a fluid outflow hole, a filter case removably attached to the mount body, and a removably mountable space in an insertion space surrounded by the mount body and the filter case. A fluid filter comprising a retained filter element, wherein the fluid flowing in through the inflow hole passes through the filter element and flows out through the outflow hole, wherein the filter element allows the fluid to pass therethrough. An inner tube formed into a cylindrical shape having a predetermined outer diameter and having a flowability capable of, and a cylindrical shape having a predetermined inner diameter larger than the predetermined outer diameter and having a flowability such that the fluid can pass therethrough. The formed outer tube and the outer tube and the inner tube can be engaged and separated from each other. Together with a tube member engaging mechanism that forms a filter medium holding space between the inner surface of the outer tube and the outer surface of the inner tube, and a filter medium formed in a cylindrical shape and inserted and held in the filter medium holding space. A fluid filter characterized by: 2. The tube member engagement mechanism includes an engagement protrusion formed on one of a proximal end side of the inner tube and a distal end side of the outer tube, and a proximal end side of the inner tube. And an engaging groove formed on the other end of the outer tube on the distal end side to engage with the engaging projection. The inner tube and the outer tube are formed by press-fitting the engaging projection into the engaging groove. The fluid filter according to claim 1, wherein the fluid filter and the fluid filter are configured to be engaged with each other. 3. The tube member engagement mechanism includes an engagement protrusion formed on one of a proximal end side of the inner tube and a distal end side of the outer tube, and a proximal end side of the inner tube. And an engaging groove formed on the other end of the outer tube on the other end side to engage with the engaging projection, and the engaging projection is engaged by rotating the outer tube or the inner tube. The fluid filter according to claim 1, wherein the fluid filter is arranged in the groove so that the inner tube and the outer tube are engaged with each other. 4. The fluid filter according to claim 1, wherein the filter medium is formed of a non-woven fabric using a chemical fiber.