JP4260592B2 - Element exchange type filtration device - Google Patents

Description

  The present invention relates to an element exchange type filtering device provided in a fuel filter of a diesel engine such as an automobile.

  There is a diesel engine as an engine for automobiles for a long time. A diesel engine uses light oil as fuel, compresses the light oil to a high pressure with an injection pump, injects it from an injector into a combustion chamber of the engine, and self-combusts in the combustion chamber.

  The fuel system is shown in FIG. The fuel system mainly includes an injection pump 1, a common rail 2, an injector 3, a fuel tank 4, a filtration device 5, and the like. The injection pump 1 is a pump that supplies high-pressure fuel, and the high-pressure fuel produced by the injection pump 1 is distributed to the injectors 3 of each cylinder via the common rail 2. Black arrows indicate the flow of fuel from the fuel tank 4 to the injector 3, and white arrows indicate the flow of return fuel from the injection pump 1 and the injector 3 to the fuel tank 4.

  In the fuel, foreign matters such as solid impurities such as dust and rust, sludge such as carbon and gum-like substances and moisture are mixed, and the filtering device 5 is provided to remove the foreign matters. The filter device 5 uses an element exchange type filter device in which an internal filter member can be replaced after a predetermined period.

  FIG. 11 and FIG. 12 show a conventional element exchange type filtration device 5. The element exchange type filtering device 5 includes a straight case 6 forming an outer shell, a filtering member 8 accommodated in the case 6, a cap 7 closing an upper opening of the case 6, and the like.

  The filter member 8 includes a first element 8 a and a second element 8 b that are integrally attached to the upper and lower sides of the end plate 13 by an adhesive 15, and an outer peripheral tip portion 13 b at the tip of an extension portion 13 a that extends the end plate 13. As shown in FIG. 12, the case 6 is bent and caulked at the upper end portion of the case 6 to form a cartridge in which the case 6 and the filter member 8 are integrated. When the filter member 8 is replaced, the cartridge in which the case 6 and the filter member 8 are integrated is replaced.

  An inflow passage and an outflow passage (not shown) are connected to the cap 7, and a bracket 11 for attaching the element exchange type filtering device 5 to a vehicle body or the like is integrally attached. The fuel introduced from the inflow passage flows to the inside of the first element 8a through the fuel passage 10 provided in the center in the vertical direction as indicated by the black arrow, and then the first element 8a and the second element 8b. Foreign matter such as water is removed when passing through the inside, and the fuel from which the foreign matter has been removed is discharged from the outflow passage. The separated water or the like is discharged to the outside through the discharge pipe 12a by opening the drain cock 12 provided at the bottom of the case 6.

  The case 6 and the cap 7 are attached as follows. That is, the case 6 is brought into contact with the lower end of the cap 7 with the packing 14 interposed on the upper surface of the outer peripheral tip portion 13b of the end plate 13 that is bent and crimped to the upper tip portion of the case 6, and then the case 6 The fastening member 9 having a female screw formed on the inner peripheral surface is inserted from the bottom, and the fastening member 9 is screwed to the male screw formed on the lower peripheral surface of the cap 7 so that the case 6 and the cap 7 are connected together. is doing.

  By the way, when the element exchange type filtering device 5 is attached to the vehicle body or the like, the attachment position is often limited. In such a case, the release lever 12b of the drain cock 12 provided at the bottom of the case 6 is easily operated. When it is desired to attach the case 6 as described above, the element exchange type filtering device 5 is provided with means for changing the attachment angle of the case 6.

  This means includes a plurality of equidistant protrusions 16 that hang downward from the lower end of the cap 7 and are provided at equal intervals, and a plurality of protrusions that are provided at the lowermost end of the extension 13a of the end plate 13 at equal intervals. 16 is formed with a hole 13c that can be inserted, and the position of the release lever 12b of the drain cock 12 provided at the bottom of the case 6 is set to the position where it can be most easily operated, and the plurality of protrusions 16 are inserted into the plurality of holes 13c. Then, the case 6 and the cap 7 are firmly connected by the fastening member 9.

  However, the conventional one has the following drawbacks. First, since the case 6 has a straight shape, when the fastening member 9 for exchanging the filtering member 8 is removed, the fastening member 9 must be removed from the case 6 by holding the fastening member 9 in the hand after releasing the screwing. It took a lot of work. Also, if the fastening member 9 is accidentally released, the fastening member 9 is dropped as it is, for example, when it hits a person, it is injured, when it falls and hits a hard object, it is damaged, or it is working in a narrow work place. If it falls, it may fall under another machine or the like and adversely affect the subsequent work.

  Further, a hole 13c provided in the extension portion 13a of the end plate 13 which is a means for changing the mounting angle of the case 6 is provided in the lowermost end portion of the extension portion 13a of the end plate 13, and the end plate 13 further includes As shown in FIG. 12, the first element 8 a and the second element 8 b are attached with an adhesive 15. Therefore, the adhesive 15 may accidentally adhere to the hole 13c when the adhesive 15 is applied, or the excess adhesive 15 may flow out and adhere to the hole 13c to close the hole 13c.

In addition, the fastening member 9 is made of resin, and when the fastening member 9 is fastened, if the fastening is continued with a strong force in spite of the fact immediately before the fastening is finished, the screws of the fastening member 9 and the like may be damaged.
JP-A-7-54728

  An object of the present invention is to provide an element exchange type filtering device that can prevent the fastening member from dropping by first providing a drop-off preventing member on the outer peripheral portion of the case by eliminating the above-mentioned drawbacks. Also, it is to provide an element exchange type filtration device that can prevent the adverse effect of clogging due to an adhesive by providing an angle positioning means composed of irregularities on the case and the cap, and further to the fastening member It is an object of the present invention to provide an element exchange type filtration apparatus that can securely tighten a fastening member by providing means for notifying the end of tightening with a sound and stopper means for stopping the rotation.

  In order to achieve the above object, the present invention employs the following configuration.

In the invention which concerns on Claim 1, the case which forms the outer shell, the filtration member accommodated in this case, the cap which obstruct | occludes the opening part of the said case, and has an external thread in a lower end outer peripheral surface, An inner peripheral surface In the element exchange type filtration apparatus having a female screw in the fastening member for fixing the case and the cap, the fastening member drops from the case when the fastening member is removed to the outer periphery of the case. A drop-off prevention member is provided , and the drop-off prevention member is attached to the outer peripheral portion of the case opposite to the opening side with respect to the fastening member that fixes the case and the cap, and the tip on the outer peripheral side thereof A configuration that is arranged so that the position is outside the inner diameter of the fastening member, and also serves as an attachment part for other parts engaged with the case .

Such a configuration prevents the fastening member from falling from the case when the fastening member is removed. Moreover , it is not necessary to separately provide other parts such as brackets for the filtration device.

In the invention according to claim 2 , the case is provided with a plurality of recesses or protrusions, the cap is provided with a plurality of protrusions or recesses, the protrusions of the cap are fitted into the recesses of the case, Or the recessed part of the said cap is fitted in the convex part of the said case, and the said case is attached to the said cap at arbitrary angles. With such a configuration, in addition to the effect of the invention according to claim 1 , there is no adverse effect that the angle positioning means made of unevenness is clogged with the adhesive.

In the invention according to claim 3 , a notch groove is provided in a thread start portion of the fastening member leaving a predetermined length of thread, and a small protrusion and a large protrusion are sequentially provided at a thread groove end portion of the cap, A configuration in which when the fastening member is fastened, the thread of the predetermined length of the fastening member gets over the small protrusion of the cap, and then comes into contact with the large protrusion to finish the rotation of the fastening member. With such a configuration, in addition to the operation of the invention according to claim 1 or 2 , it is possible to know the end of tightening of the fastening member by sound, and the fastening of the fastening member is prevented by the stopper means.

In the invention according to claim 1, by providing a member for preventing the fastening member from dropping on the outer peripheral portion of the case, it is possible to prevent the fastening member from falling from the case when the fastening member is removed. Can be continued, and the reliability of the filtration device can be increased accordingly. Further , it is not necessary to separately provide a mounting portion such as a bracket in the filtration device, and the production cost can be reduced accordingly.

In the invention according to claim 2 , in addition to the effect of the invention according to claim 1 , the angle positioning means may be clogged with an adhesive in addition to the effect of the invention according to claim 1 by providing the case and the cap with an angle positioning means comprising a convex portion or a concave portion. The reliability of the filtration device can be increased accordingly.

In the invention according to claim 3 , in addition to the effect of the invention according to claim 1 or 2 , in addition to the effect of the invention according to claim 1 or 2 , by providing the fastening member and the screw portion of the cap with a means for generating a sound, the fastening member is further tightened. While being able to know reliably, the stopper means can prevent over-tightening of the fastening member, and the reliability of the filtration device can be further improved accordingly.

  FIG. 1 shows a cross-sectional view of a diesel element exchange filter device of the present invention mounted on an automobile or the like. The element exchange type filtering device 20 includes a cup-shaped case 21 that forms an outer shell, a cap 22 that is detachably attached to an upper opening end of the case 21, a filtering member 23 that is housed in the case 21, and the like. Become.

  The case 21 is a resin-made hollow cylindrical member having an upper opening, and a packing 24 is attached to the outer periphery of the upper end portion. The filtering member 23 is located at the center of the fuel passage 23a which also serves as a core, an element 23b formed from paper or the like wound concentrically on the outer periphery of the fuel passage 23a, and an upper portion provided with a hole (not shown). It is formed in a unit shape from the end plate 23c and a lower end plate 23d provided with a hole (not shown).

  The upper space 25 and the lower space 26 are formed above and below the case 21 in a state where the filtering member 23 is accommodated in the case 21. The lower space 26 is a space for separating and storing water and the like contained in the fuel, and a water level sensor 27 and a drain cock 28 are attached to the lower space 26. The water level sensor 27 includes a column 27a in which a reed switch is disposed, a float 27b that is disposed on the outer periphery of the column 27a so as to be movable up and down and has a magnet therein, and a lead wire connected to the reed switch in the column 27a. When a predetermined amount of water accumulates in the lower space 26, the float 27b moves up and turns on the reed switch to notify the driver of the state via the lead wire 27c.

  Further, the drain cock 28 is provided at the bottom of the lower space 26 and has an opening / closing lever 28a and a discharge pipe 28b. When the driver opens the lever 28a, a predetermined amount of water accumulated in the lower space 26 is discharged. It is discharged from the tube 28b.

  The cap 22 is made of resin, and a manual pump device 29 is integrally formed on the upper surface, and a fuel inflow pipe 32 and a fuel outflow pipe 33 are attached to the side surfaces thereof. The fuel inflow pipe 32 communicates with a pump chamber 31 described later formed in the cap 22, and the fuel outflow pipe 33 communicates with the upper space 25 in the case 21. Further, a first check valve 34 is disposed between the fuel inflow pipe 32 and the pump chamber 31, and allows only a flow from the fuel inflow pipe 32 toward the pump chamber 31. Further, a second check valve 35 having the same function is disposed between the pump chamber 31 and the fuel passage 23a of the filter member 23, and only allows the flow from the pump chamber 31 toward the fuel passage 23a. ing.

  The manual pump device 29 is sandwiched between a body 29a formed integrally with the cap 22 and having its upper end opened, a cover member 29b for closing the upper end open portion of the body 29a, and the body 29a and the cover member 29b. A diaphragm 29c, a pressing member 29d for manually moving the diaphragm 29c up and down, a spring 29e disposed between the cover member 29b and the pressing member 29d, and the like.

  The diaphragm 29c is a rubber disk-shaped member, and by screwing a female screw provided on the inner peripheral surface of the lower end of the cover member 29b with a male screw provided on the upper peripheral surface of the body 29a, The pump chamber 31 is formed in the body 29a with the diaphragm 29c sandwiched between the cover members 29b, and the atmospheric chamber 30 is formed in the cover member 29b.

  The pressing member 29d is a resin member as a manual operation unit that is disposed above the cover member 29b and elastically deforms the diaphragm 29c. The pressing member 29d is fixed integrally with the diaphragm 29c by screws 29f with the cover member 29b interposed therebetween. Is done. The spring 29e is arranged between the cover member 29b and the pressing member 29d so as to constantly urge the pump chamber 31 in the enlargement direction, and by pushing the pressing member 29d, the air in the pump chamber 31 and the like. Through the second check valve 35 to the fuel passage 23a side. The manual pump device 29 is used after exchanging the filter member 23 or when draining water from the element exchange type filter device 20.

  The fuel flow after connection of the case 21 and the cap 22 flows along a path indicated by black arrows (1) to (5) in the drawing. That is, the fuel flowing in from the fuel inflow pipe 32 as shown by the arrow (1) flows into the pump chamber 31 through the first check valve 34, and then as shown by the arrows (2) and (3). It reaches the lower space 26 through the check valve 35 and the fuel passage 23a. After the water and the like contained in the lower space 26 are separated, the foreign matter contained when the fuel passes through the element 23b is removed, and the fuel from which the foreign matter has been removed flows as indicated by arrows (4) and (5), It is discharged from the fuel outflow pipe 33.

  Next, the connection between the case 21 and the cap 22 will be described in the form of FIGS. A small-diameter portion 40 is formed in the upper portion of the case 21 from the upper end portion to the lower side over the length h, and further, a large-diameter portion 41 is formed in the lower portion of the small-diameter portion 40 over the length H1. The small diameter portion 40 is a portion where the entire length h is inserted into the lower end opening 22b of the cap 22, and a ring groove 42 into which the packing 24 is fitted is formed on the outer peripheral surface thereof.

  The large diameter portion 41 has an upper end surface 41a, a lower end surface 41b, and a side end surface 41c. When the small diameter portion 40 is inserted into the lower end opening 22b of the cap 22, the lower end portion of the cap 22 is inserted into the upper end surface 41a. The lower end surface 41b is in contact with the inner surface of a ring-shaped horizontal portion 36b that is formed to protrude to the inner side of the lower end of the fastening member 36 when the fastening member 36 is fastened. The side end face 41c is formed with four concave portions 43 having a predetermined depth and a rectangular shape in front view into which a flat plate-shaped convex portion 44 formed by suspending from the lower end portion of the cap 22 can be inserted. The convex portion 44 formed at the lower end of the cap 22 constitutes an angle positioning means.

  A male screw 22a is formed on the outer peripheral surface of the lower end of the cap 22 over a length H2, and a small diameter portion 40 having a length h at the upper end of the case 21 is fitted into the lower end opening 22b inside the cap. Further, at the lower end portion of the cap 22, two flat convex portions 44 are formed 90 degrees apart on the circumference. The flat convex portion 44 is slightly smaller than the concave portion 43 formed on the side end surface 41 c of the case 21. When the small-diameter portion 40 of the case 21 is fitted into the lower end opening 22 b of the cap 22, 2 of the cap 22 is formed. Any two of the four concave portions 43 of the case 21 are selected for the one convex portion 44.

  For example, the fitting of the case 21 and the cap 22 is performed so that the lever 28a of the drain cock 28 attached to the lower end of the case 21 is easily operated, and the concave portion 43 and the convex portion 44 are angled. Form positioning means. In other words, the mounting position of the case can be appropriately set by the concave portion 43 and the convex portion 44. In addition, although the number of the recessed part 43 and the convex part 44 was demonstrated with 2 and 4, one side may be one and the other may be two or more, and the combination is considered variously.

  1, 3, and 4 are angle positioning means in which a plurality of concave portions 43 are provided in the upper end portion of the case 21 and a plurality of convex portions 44 are provided in the lower end portion of the cap 22. 5 to 7, the case 21 may be provided with a convex portion 51 and the cap 22 may be provided with a concave portion 52. What is shown in FIGS. 5 to 7 will be described. FIG. 5 shows the state after tightening, FIG. 6 shows the state of the case 21, and FIG. 7 shows the state of the bottom surface of the cap 22.

  A thick portion 50 is formed at the upper end of the case 21 over the length H3. The thick portion 50 is a portion inserted into the lower end opening 22b of the cap 22 over a length H3, and a ring groove 42 into which the packing 24 is fitted is formed on the outer peripheral surface thereof. Moreover, as shown in FIG. 6, two flat plate-like convex portions 51 are provided on the upper surface of the thick portion 50 so as to be 90 degrees apart from each other on the circumference.

  A step portion 54 is formed in the cap 22 at a position that is deeper by a length H3 from the lower end portion, and recesses 52 are further spaced from the step portion 54 to the inner bottom portion at intervals of 90 degrees as shown in FIG. Four angled positioning means are formed by the four convex portions 51 formed at the upper end portion of the case 21.

  The convex portion 51 formed on the upper end portion of the case 21 is slightly smaller than the concave portion 52 formed on the inner peripheral surface 53 of the cap 22, and the thick portion 50 of the case 21 is fitted to the lower end opening portion 22 b of the cap 22. In doing so, any two of the four concave portions 52 formed on the inner peripheral surface 53 of the cap 22 are selected with respect to the two convex portions 51 of the case 21.

  When the case 21 and the cap 22 are fitted, for example, the case 21 and the cap 22 are fitted so that the lever 28a of the drain cock 28 attached to the lower end of the case 21 is in an easily operable position. Thus, the thick portion 50 of the case 21 is fitted to the lower end opening 22b of the cap 22 by a length H3. In this case, the optimum two of the four concave portions 52 formed on the inner peripheral surface 53 of the cap 22 with respect to the two convex portions 51 of the case 21 are selected. After the fitting between the two parts 21 and 22, as shown in FIG. 5, the upper end surface 55 of the thick portion 50 comes into contact with the stepped portion 54 inside the cap 22, and the lower end surface 56 is substantially the same position as the lower end portion of the cap 22. become.

  The fastening member 36 is substantially the same as that shown in FIGS. 1, 3, and 4, and the fastening is performed by first determining the angular position of the case 21 and placing the thick portion 50 of the case 21 in the lower end opening 22 b of the cap 22. And the fastening member 36 is inserted with the vertical portion 36a facing upward from below the case 21, and the inner peripheral surface of the vertical portion 36a of the fastening member 36 is inserted into the male screw 22a formed on the outer peripheral surface of the cap 22. This is carried out by engaging the female screw 36d formed on the first member and rotating the fastening member 36. At the end of fastening, the inner surface of the horizontal portion 36 b of the fastening member 36 is brought into contact with the lower end surface 56 of the thick portion 50. When the filter member 23 is replaced, the above-described procedure is reversed.

  The dropout prevention member 60 of the fastening member 36 according to the present invention will be described. The drop-off prevention member 60 is a resin member and includes a vertical flat plate portion 60a, a flange portion 60b, and a column portion 60c. The vertical flat plate portion 60a is a flat plate member that is suspended, and a bracket 61 is attached to the surface of the vertical flat plate portion 60a by attachment means such as a screw (not shown). The flange portion 60b is a portion formed by horizontally projecting outward on the upper side surface of the vertical flat plate portion 60a, and its upper surface faces the fastening member 36 and receives the fastening member 36 when the fastening member 36 is removed. Prevent 36 from falling.

  The column portion 60c is a portion that connects the outer peripheral surface of the case 21 and the back surface of the vertical flat plate portion 60a to support the drop-off prevention member 60, and is in a position where the drop-off prevention member 60 does not get in the way when the fastening member 36 is removed. Attached to the outer peripheral surface of the case 21. The dropout prevention member 60 is joined to the case 21 by welding such as heating. In the case where the case 21 is divided into an upper case and a lower case, for example, the case 21 is joined to the upper case by welding such as heating, or formed integrally with the lower case, and the fastening member 36 is The upper case and the lower case are attached to the case by welding such as heating.

  As shown in FIG. 1, one end of a bracket 61 is attached to the surface of the vertical flat plate portion 60a of the drop-off prevention member 60 by attachment means (not shown), and the other end of the bracket 61 is attached to the vehicle body 62 by attachment means such as a bolt 63. It is done. In this way, the drop-off prevention member 60 is also used as an attachment member for the bracket 61, which is a component other than the element exchange type filtering device, so that it is not necessary to separately provide an attachment member for the bracket 61, thereby reducing the production cost. it can.

  FIG. 2 shows an example in which a connector 65 which is still another component is attached to the drop-off prevention member 60. As shown in the figure, a connector 65 is attached to the surface of the vertical flat plate portion 60 a of the drop-off prevention member 60, and the connector 65 is connected to the lead wire 27 c of the water level sensor 27. By attaching the connector 65 to the drop-off preventing member 60 in this way, it is not necessary to separately provide an attachment member for the connector 65.

  1 and 2 are provided with one drop-off preventing member 60 on the case 21, but a plurality of drop-off preventing members 60 may be provided on the case 21. In that case, the drop-off prevention member 60 is provided on the outer peripheral surface of the case 21 with an appropriate interval, and the height positions of the flange portions 60b of the drop-off prevention member 60 are substantially the same.

  By arranging in this way, when the fastening member 36 is removed, it will be supported substantially horizontally by the flanges 60b, and the operation for replacing the filtering member 23 and screwing the fastening member 36 again will be performed. make it easier. In addition, by forming a plurality of drop-off prevention members 60 integrally with the case 21 and using the drop-off prevention members 60 as attachment parts for other parts, the attachment parts for each part can be made unnecessary and the production cost can be increased. Can be reduced.

  By the way, since both the cap 22 and the fastening member 36 are made of resin, when the fastening member 36 is fastened, the screws such as the fastening member 36 are damaged if the fastening is continued with a strong force even immediately before the fastening is finished. There is a fear. Means for preventing such harmful effects will be described.

  3 and 4 show a part of the means provided on the male screw 22a of the cap 22, and FIGS. 8 and 9 show an enlarged schematic view of the means provided on the male screw 22a of the cap 22 and the female screw 36d of the fastening member 36. .

  The female screw 36d of the fastening member 36 is provided with a notch groove 73 leaving a screw thread having a predetermined length from the screw thread starting portion. As a result, the female thread 36d of the fastening member 36 has a thread protrusion 72 formed at the thread start portion, a notch groove 73 immediately after that, and a conventional female screw 36d following the notch groove 73.

  Further, a small protrusion 70 and a stopper protrusion 71 which is larger than the small protrusion 70 are formed in order in the screw groove 22c near the end of the male screw 22a of the cap 22 with a slight gap. The size of the small protrusion 70 is set such that the screw protrusion 72 formed on the screw thread starting portion of the fastening member 36 can get over when the fastening member 36 is fastened. In this case, both the screw protrusion 72 and the small protrusion 70 are made of resin, and a sound is emitted when the screw protrusion 72 gets over the small protrusion 70.

  By providing the cap 22 and the fastening member 36 with such a configuration, when the fastening member 36 is fastened, the female screw 36d of the fastening member 36 is screwed into the male screw 22a of the cap 22, Immediately before the end of the fastening, the screw protrusion 72 at the thread starting portion of the fastening member 36 comes into contact with the small protrusion 70 provided in the screw groove 22c in the vicinity of the end portion of the male screw 22a of the cap 22 as shown in FIG. Although it is possible to know the end of fastening only by the touching feeling, if the fastening member 36 is continuously rotated without feeling that feeling, the small protrusion 70 of the cap 22 is screwed to the fastening member 36 as shown in FIG. The protrusion 72 is overcome and falls into the cutout groove 73. During the continuous operation, the operator can feel a stronger impact and hear a clicking sound, and can know the end of fastening by the impact and sound. In this way, the screw projection 72 of the fastening member 36 and the small projection 70 of the cap 22 form a fastening end detection mechanism.

  When the screw protrusion 72 of the fastening member 36 gets over the small protrusion 70 of the cap 22, a little large force is applied, and this force lasts until the end of the ride and there is no means for stopping the rotation thereafter. There is a possibility that the screw of the fastening member 36 or the like may be damaged. Since the cap projection 22 is provided with a stopper projection 71 larger than the small projection 70 immediately after the small projection 70, the screw projection 72 of the fastening member 36 is The rotation hits the stopper projection 71 and is reliably stopped. As a result, there is no possibility that the screws such as the fastening member 36 are damaged. In this way, the screw protrusion 72 of the fastening member 36 and the stopper protrusion 71 of the cap 22 form an over-tightening prevention mechanism.

  The invention of the present application is not limited to the configuration of each of the embodiments described above, and can be appropriately changed in design without departing from the gist of the invention, and has been described as an element exchange type filtration device provided in a fuel filter of a diesel engine. However, it can also be applied to a simple element exchange type filtration apparatus.

Sectional drawing which shows the element exchange type | mold filtration apparatus of this invention The expanded sectional view which attached the connector to the drop-off prevention member of the present invention Schematic before attaching the case and cap of the present invention Schematic with the case and cap of the present invention attached Partial sectional view showing angle positioning means with the case and cap of the present invention attached Schematic showing angle positioning means at the top of the case of the present invention Schematic showing angle positioning means on the inner surface of the cap of the present invention Schematic showing the state immediately before tightening the case and cap of the present invention Schematic showing the state immediately after tightening the case and cap of the present invention Schematic diagram of fuel supply system for diesel engine Sectional view of a conventional element exchange filter Part A enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Element exchange type filtration apparatus 21 ... Case 22 ... Cap 22a ... Male screw 22b ... Lower end opening part 22c ... Screw groove 23 ... Filtration member 23a ... Fuel passage 23b ... Element 23c ... Upper end plate 23d ... Lower end plate 24 ... Packing 25 ... Upper space 26 ... Lower space 27 ... Water level sensor 27a ... Strut 27b ... Float 27c ... Lead wire 28 ... Drain cock 28a ... Lever 28b ... Discharge pipe 29 ... Manual pump device 29a ... Body 29b ... Cover member 29c ... Diaphragm 29d ... Press member 29e ... Spring 29f ... Screw 30 ... Air chamber 31 ... Pump chamber 32 ... Fuel inflow pipe 33 ... Fuel outflow pipe 34 ... First check valve 35 ... Second check valve 36 ... Tightening member 36a ... Vertical Part 36b ... Horizontal part 36c ... Center opening 36d ... Female screw 40 ... Small diameter part 41 ... Large diameter part DESCRIPTION OF SYMBOLS 1a ... Upper end surface 41b ... Lower end surface 41c ... Side end surface 42 ... Ring groove 43 ... Concave part 44 ... Convex part 50 ... Thick part 51 ... Convex part 52 ... Concave part 53 ... Inner peripheral surface 54 ... Step part 55 ... Upper end face 56 ... Lower end surface 60 ... Falling prevention member 60a ... Vertical flat plate portion 60b ... Hut portion 60c ... Staff portion 61 ... Bracket 62 ... Car body 63 ... Bolt 65 ... Connector 70 ... Small projection 71 ... Stopper projection 72 ... Screw projection 73 ... Notch groove

Claims (3)

A case forming an outer shell, a filtering member housed in the case, a cap closing the opening of the case and having a male screw on the outer peripheral surface of the lower end, and the case having a female screw on the inner peripheral surface; In the element exchange type filtration apparatus provided with a fastening member for fixing the cap,
A fall prevention member is provided on the outer periphery of the case to prevent the fastening member from falling from the case when the fastening member is removed .
The drop-off preventing member is attached to the outer peripheral portion of the case opposite to the opening side with respect to the fastening member that fixes the case and the cap, and the tip position on the outer peripheral side is outside the inner diameter of the fastening member. An element exchange type filtration apparatus , which is also arranged and serves as an attachment portion for other parts engaged with the case . The case is provided with a plurality of concave portions or convex portions, the cap is provided with a plurality of convex portions or concave portions, the convex portions of the cap are fitted into the concave portions of the case, or the cap is provided on the convex portion of the case. The element replacement type filtering apparatus according to claim 1, wherein the case is attached to the cap at an arbitrary angle. A notch groove is provided leaving a predetermined length of screw thread at a thread start portion of the fastening member, and a small protrusion and a large protrusion are sequentially provided at a thread groove end portion of the cap, and when the fastening member is fastened, the fastening member 3. The element exchange type according to claim 1, wherein a screw thread of a predetermined length of the screw rides over the small protrusion of the cap and then comes into contact with the large protrusion to finish the rotation of the fastening member. Filtration device.

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