JPH0141461Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cleaning device for a cylindrical filter, and in particular to a filter suitable for cleaning filters used in strainers for fuel, etc. of marine diesel engines. The present invention relates to a cleaning device.

[Conventional technology]

Generally, fuel oil in a marine diesel engine is first led from a settling tank to a service tank via a primary strainer, where it is heated and maintained at 80°C to 90°C, and then led to a return chamber via a secondary strainer. The fuel is then supplied to the diesel engine through a booster pump, a heater, and a tertiary strainer.

By the way, as the filters of the secondary strainer and the tertiary strainer, it is customary to use a cylindrical filter having a fine mesh.
This cylindrical filter is normally removed from the strainer about once every six months during a voyage, and is reused after cleaning.

Conventionally, when cleaning cylindrical filters onboard a ship, the cylindrical filters were first removed from the strainer and immersed in a designated cleaning solution for a long time to dissolve and remove the attached oil, and then compressed air was used to remove foreign substances. A method is adopted to remove the .

However, when cleaning with compressed air, it takes a lot of time to remove foreign matter adhering to the filter surface, and the foreign matter cannot be completely removed. There is a problem in that it must be cleaned using In particular, recently due to the deterioration of the quality of fuel oil, the frequency of filter clogging has increased, making it necessary to clean the filter even during voyages. Conventional cleaning methods that cannot be expected to have a cleaning effect cannot be put to practical use.

Therefore, in Japanese Patent Application No. 61-12994, the present applicant previously proposed a cylindrical nozzle with a nozzle hole on the circumference and a closed tip inside a cylindrical filter with unevenness on the inner circumference. We have proposed a filter cleaning method in which the filter is cleaned by rotating the filter around the nozzle using steam injected from the nozzle hole of the nozzle. By using this filter cleaning method, the synergistic effects of the heat of the steam, the hammering effect of water droplets in the steam, the vibrations caused by the rotation of the filter, and the changes in the angle at which the steam hits the filter surface due to the rotation of the filter, etc. , the filter can be quickly and almost completely cleaned with simple equipment, and there is no risk of damaging the filter surface, etc., and many other effects can be obtained.

[Problem that the invention attempts to solve]

By the way, a plurality of nozzle holes are bored at required intervals in the axial direction in a cylindrical nozzle with a closed end, and steam from a steam source connected to the base end side of the nozzle is injected from each of the nozzle holes. When cleaning a filter using a closed nozzle, a sufficient amount of steam can be obtained from the nozzle hole close to the nozzle tip, but as the nozzle hole moves away from the nozzle tip, the amount of steam gradually decreases and There is a problem that the cleaning effect varies depending on the direction. This tendency is particularly noticeable when there is no large difference between the opening area of the steam inlet at the base end of the nozzle and the total opening area of all nozzle holes.

The present invention was developed in view of the current situation, and an object of the present invention is to provide a filter cleaning device that can substantially uniformize the amount of steam injected from each of a plurality of nozzle holes to prevent variations in cleaning effect. do.

[Means for solving problems]

This invention has a cylindrical nozzle with a closed tip.
It is characterized in that an adjustment rod is arranged to gradually reduce the cross-sectional area of the steam flow path from the base end to the tip end.

[Effect]

In the filter cleaning device according to the present invention,
An adjustment rod is placed inside a cylindrical nozzle with a closed tip, and the cross-sectional area of the steam flow path inside the nozzle gradually decreases from the base end to the tip, so the steam pressure inside the nozzle is reduced. is almost uniform in the axial direction. Therefore, it is possible to make the amount of steam injected from each of the plurality of nozzle holes substantially uniform.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

1 and 2 show an example of a filter cleaning device according to the present invention, and this cleaning device 1
is equipped with a box-shaped base 2 having a steam exhaust pipe 3, and on this base 2, as shown in FIG.
is fixed upright.

As shown in FIGS. 1 and 2, four large steam exhaust ports 6 are provided at equal intervals in the circumferential direction at positions corresponding to the inside of the stand pipe 4 on the upper surface of the base 2, Further, in the center part, as shown in FIG. 1, a cylindrical nozzle 7 with an upper end closed and having an adjustment rod 8 disposed therein is vertically fixed and erected. At the lower end of this nozzle 7, there is a pressure gauge 9 and an inlet valve 1 as shown in FIGS. 1 and 2.
Steam for general use on ships (wet steam of about 4 to 7 kg/cm ² ) is supplied through the nozzle 7, and the outer periphery of the nozzle 7 is equipped with a cylinder whose upper end is closed, as shown in Fig. 1. A shaped filter 11 is removably attached from above, and is cleaned by the steam jetted from the nozzle 7 while rotating around the nozzle 7. This nozzle 7 and adjustment rod 8
This will be explained in detail later.

On the other hand, as shown in FIGS. 1 and 2, a stand pipe 4 is provided at the upper end of the stand pipe 4.
A head cover 12 is detachably attached to close the upper end of the filter 11, and the filter 11 can be attached to and detached from the nozzle 7 with the head cover 12 removed from the stand pipe 4.

A sleeve 14, which is fixed in position by a stopper 13, is disposed through the center of the head cover 12, as shown in FIG. It is inserted freely into the . At the lower end of this guide rod 16,
As shown in FIG. 1, a cap-shaped holding fitting 17 that encloses the upper end of the filter 11 in a non-contact manner is fixedly installed to prevent the filter 11 from slipping out of the nozzle 7 in the unlikely event that the cap-shaped holding fitting 17 is held therein.

As shown in FIGS. 3 and 4, the nozzle 7 is a cylindrical member having a male threaded portion 7a on the outer circumference of the lower end for screwing and fixing to the base 2, and a female threaded portion 7b on the inner circumference of the upper end. V-shaped notches 18a, 18b are provided at two locations on the circumferential surface facing each other in the radial direction, each having a required length in the axial direction, and these notches 18a, 18
b has a large number of nozzle holes 19 arranged at regular intervals in the axial direction.
a and 19b are drilled respectively. As shown in FIG. 4, each of these nozzle holes 19a, 19b opens in a tangential direction to the inner peripheral surface of the nozzle 7, and both nozzle holes 19a, 19b are vertically shifted by a half pitch. It is being

On the other hand, the adjustment rod 8 disposed within the nozzle 7 is connected to the nozzle 7 as shown in FIGS. 5 and 6.
A rod part 8a is inserted from inside from above, a male thread part 8b is screwed into the female thread part 7b of the nozzle 7 and closes the upper end of the nozzle 7, and a male thread part 8b protrudes from the upper end of the nozzle 7 to close the upper end of the filter 11 from below. It is composed of a spherical support portion 8c that is supported from the side.

As shown in FIGS. 5 to 9, the rod portion 8a is a round bar having an outer diameter that is approximately the same as the inner diameter of the nozzle 7, and the portion facing the nozzle holes 19a, 19b is arranged in a direction from the upper end to the lower end. It is formed by cutting a flat surface 20 that gradually slopes toward the axis, and a pyramid-shaped guide portion 21 is provided at the lower end of the rod portion 8a to serve as a guide when inserting the rod portion 8a into the nozzle 7. It is provided. Then, by inserting the rod portion 8a into the nozzle 7, the seventh
As shown in FIGS. 9 to 9, steam channels 22a and 22b are formed in the nozzle 7, the cross-sectional area of which gradually decreases from the lower end to the upper end.

Next, the operation of this embodiment will be explained.

When cleaning the filter 11, first remove the filter 11 from a strainer (not shown), and place the filter 11 in a predetermined cleaning solution that has been conventionally used.
Soak for an appropriate amount of time to dissolve and remove the attached oil.
Then, as shown in FIG. 1, it is attached to the nozzle 7 of the cleaning device 1, and the head cover 12 is attached to the upper end of the stand pipe 4. At this time, the upper end of the filter 11 is enclosed in the holding fitting 17, but under normal conditions, the upper end of the filter 11 does not come into contact with the holding fitting 17. For some reason, when the filter 11 rises, its upper outer circumferential surface or upper end surface comes into contact with the holding fitting 17, and the filter 11 is prevented from coming out of the nozzle 7.

In this way, once the filter 11 is installed in the cleaning device 1, miscellaneous steam from the ship is supplied to the lower end of the nozzle 7 through the inlet valve 10, and the steam flow path 22
The liquid is injected from each nozzle hole 19a, 19b via a, 22b.

At this time, since each nozzle hole 19a, 19b opens in a tangential direction to the inner peripheral surface of the nozzle 7, the steam injected from each nozzle hole 19a, 19b and collided with the inner peripheral surface of the filter 11, When passing through the filter surface and ejecting to the outside, the filter surface is cleaned and the filter 11 is driven to rotate around the nozzle 7.

Therefore, the filter 11 is cleaned while rotating around the nozzle 7.
The inner circumferential surface of the is cleaned uniformly in the circumferential direction. In addition, in the axial direction, a large number of nozzle holes 19a, 19b are provided at narrow pitches, and both nozzle holes 19a, 19b are provided offset by half a pitch. The steam collides with the filter surface while gradually spreading, and since the filter 11 vibrates up and down to some extent due to rotation, the steam is injected over the entire surface of the filter 11, and there is no part where the steam is not injected.

By the way, when steam is supplied from the lower end side to the nozzle 7 whose upper end is closed, the steam guided into the nozzle 7 first rises inside the nozzle 7 and collides with the upper end of the nozzle 7, and then the nozzle located at the upper end of the nozzle 7 Hole 19a,
A part of the steam is injected from 19b, and the remaining steam is sequentially injected from the nozzle holes 19a and 19b below, so the steam pressure inside the nozzle 7 is highest at the upper end and increases as it goes to the lower end. It will gradually decline. Therefore, the nozzle holes 19a, 19b near the upper end of the nozzle 7 can obtain a sufficient amount of injected steam, but as the nozzle holes 19a, 19b move away from the upper end of the nozzle 7, the amount of injected steam gradually decreases. The cleaning effect varies in the axial direction.

However, in this embodiment, the adjustment rod 8 is inserted into the nozzle 7, and steam flow paths 22a and 22b whose cross-sectional area gradually decreases from the lower end to the upper end are formed in the nozzle 7. The amount of supplied steam gradually decreases toward the tip of the nozzle 7, thereby making it possible to make the steam pressure within the nozzle 7 substantially uniform in the axial direction. Therefore, the amount of steam injected from each nozzle 19a, 19b becomes substantially uniform, and it becomes possible to effectively prevent variations in the cleaning effect in the axial direction of the filter 11.

After the filter 11 has been steam-cleaned for a predetermined period of time in this manner, the filter 11 is temporarily removed from the cleaning device 1. Then, hold the filter 11 over the light source and visually observe the state of light transmission. If the light transmission is insufficient, remove the filter 11 again from the cleaning device 1.
and perform steam cleaning.

Since the cleaning is performed using steam instead of the conventional air, it is expected that the cleaning efficiency using heat will be improved. Furthermore, since wet steam is used as the steam, it is expected that cleaning efficiency will be improved due to the hammering effect of water droplets in the steam. And since this steam can be used as is from a ship's miscellaneous steam, a special steam generator is not required.

Also, the filter 11 is connected to the nozzle 7 by the force of the steam.
The cleaning efficiency can be improved since the filter rotates around the periphery and vibration is applied to the filter surface.
Unlike the case of ultrasonic cleaning, this vibration is not directly applied to the filter surface, but is applied indirectly through the aggregate of the filter 11, etc.
There is very little risk of damaging the filter surface.

Note that the cleaning device 1 in the first embodiment has the following features:
It can be applied not only to filters in which the liquid flows from the outside to the inside of the filter surface, but also to filters in which the liquid flows from the inside to the outside, but the latter type in which the liquid flows from the inside to the outside of the filter surface Since the forward direction and the steam cleaning direction are the same and no backwashing occurs, the cleaning effect is somewhat lower than in the former case.

Figures 10 to 14 show a book used for steam cleaning a cylindrical filter 31, which is a type in which the liquid flows from the inner side to the outer side of the filter surface, and has a hole 31a at the upper end. This shows a second embodiment of the invention, which will be described below. The present embodiment is characterized only by the groove structure around the nozzle, and the other parts are basically the same in structure as the first embodiment, so only this characteristic part will be illustrated and explained below.

In Fig. 10, 2 is a base, and this base 2
As shown in FIG. 10 and FIG.
is installed vertically. and the filter 3
1, the support 33 is inserted into the hole 31a as shown in FIG.
It is attached to each support column 33 with the upper end thereof fitted.

The lower end of each of these filters 31 is rotatably supported by a thrust bearing 37 via a filter receiver 34, a buffer spring 35, and a spring receiver 36, as shown in FIG. The injected steam rotates around the pillar 33 for steam cleaning. Furthermore, a cylindrical foreign matter adhesion material 38 is detachably attached to the outer periphery of each support column 33 to prevent foreign matter removed from the filter 31 by steam cleaning from adhering again to the inner surface of the filter. has been done.

On the other hand, the nozzle 32 is shown in FIG.
As shown in FIG. 3, it is formed of a cylindrical material having a male threaded part 32a on the outer circumference of the lower end for screwing and fixing to the base 2, and a female threaded part 32b on the inner circumference of the upper end, and is opposed in the radial direction. A large number of cleaning nozzle holes 39a and 39b are respectively bored at regular intervals in the axial direction at two locations on the circumferential surface. Each of these nozzle holes 39a, 39b is open in the radial direction as shown in FIG. It is located at a height.

Further, as shown in FIGS. 12 and 13, an arbitrary number of drive nozzle holes 40a, 40b are provided at positions shifted by a required angle in the circumferential direction of the nozzle 32 with respect to each nozzle hole 39a, 39b. The deviation angle θ of each nozzle hole 40a, 40b from the nozzle hole 39a, 39b is, for example,
It is set at 30 degrees. and each filter 3
1 is adapted to be rotationally driven only by steam injected from these respective nozzle holes 40a, 40b.

An adjustment rod 41 shown in FIG. 14 is disposed within the nozzle 32. This adjustment rod 41 is connected to the nozzle 3 as shown in FIG.
a rod portion 41a that is inserted into the nozzle 2 from above; and a male-threaded plug portion 41b that is screwed onto the female-threaded portion 32a of the nozzle 32 to close the upper end of the nozzle 32.
It is composed of.

The rod portion 41a is a round rod having an outer diameter that is approximately the same as the inner diameter of the nozzle 32.
a, 40a and 39b, 40b are formed by cutting a flat surface 42 that gradually slopes toward the axis from the upper end to the lower end, and the rod portion 4a is inserted into the nozzle 32 at the lower end thereof. A pyramid-shaped guide portion 43 is provided to serve as a guide when inserting the device. By inserting this rod portion 41a into the nozzle 32, a steam flow path whose cross-sectional area gradually decreases from the lower end to the upper end is formed within the nozzle 32, as in the case of the nozzle 7 in the first embodiment. It is becoming more and more common.

Next, the operation of this embodiment will be explained.

When steam is supplied to the nozzle 32, this steam is injected from each nozzle hole 39a, 39b, 40a, 40b. The steam injected from the nozzle holes 40a and 40b collides with the filter surface of each filter 31 at right angles, while the steam jetted from the nozzle holes 40a and 40b collides with the filter surface of each filter 31 at an angle in a tangential direction, as shown by arrow B in FIG. For this reason,
Each filter 31 is cleaned by the steam jetted from the nozzle holes 39a, 39b, and is rotationally driven by the steam jetted from the nozzle holes 40a, 40b.

Since each filter 31 is steam-cleaned while rotating, the same effects as in the first embodiment can be expected.

Note that in the second embodiment, the cleaning nozzle hole 3
9a, 39b and driving nozzle holes 40a, 40b
Although the case where the nozzle hole 40 is provided has been explained, the nozzle hole 40
a, 40b are omitted, and the nozzle hole 39
a, 39b may be moved to the positions of the nozzle holes 40a, 40b so that all the steam is inclined tangentially to the filter surface and collides with it.

In this way, some of the steam passes through the filter 31.
Although the cleaning effect is somewhat reduced, the structure of the nozzle 32 can be simplified.

Further, drive nozzle holes 40a and 40b are provided at positions corresponding to the filter receiver 34, for example, and the nozzle holes 40a and 40b are provided in the filter receiver 34.
Filter receiver 34 receives the injected steam from 40b.
It is also possible to provide a blade for rotating the filter 31 and indirectly rotate the filter 31 via the filter receiver 34.

[Effect of idea]

As explained above, in the present invention, an adjustment rod that gradually reduces the cross-sectional area of the steam flow path from the base end to the tip is placed inside the cylindrical nozzle with the tip closed. The steam pressure within the nozzle becomes substantially uniform in the axial direction, and the amount of steam injected from each of the plurality of nozzle holes can be made substantially uniform.

In addition, since the filter is cleaned with steam, the synergistic effects of the heat of the steam, the hammering effect of water droplets in the steam, the vibrations caused by the rotation of the filter, and the changes in the angle at which the steam hits the filter surface due to the rotation of the filter, The filter can be quickly and almost completely cleaned with simple equipment, and the filter surface is not damaged.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a cleaning device according to a first embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
The figure is a partial cross-sectional view showing details of the nozzle, Figure 4 is a cross-sectional view taken along the - line in Figure 3, Figure 5 is a detailed view of the adjustment rod, Figure 6 is a side view of Figure 5, and Figure 7 is a cross-sectional view taken along the - line in Figure 3. 5, FIG. 8 is a sectional view taken along the - line in FIG. 5, FIG. 9 is a sectional view taken along the - line in FIG. 5, and FIG.
The figure is a sectional view of the main part showing the second embodiment of the present invention,
Figure 1 is a plan view of Figure 10, Figure 12 is a partial cross-sectional view showing the details of the nozzle, and Figure 13 is the XII of Figure 12.
-XII line sectional view, FIG. 14 is a detailed view of the adjustment rod. 1...Cleaning device, 7, 32...Nozzle, 8, 4
1...adjustment rod, 8a, 41a...rod part,
11, 31...Filter, 19a, 19b, 39
a, 39b, 40a, 40b...nozzle hole, 2
0, 42...plane, 22a, 22b...steam flow path.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical nozzle with a closed end having a plurality of cleaning nozzle holes of the same size at required intervals in the axial direction, and a distance from each cleaning nozzle hole to the filter surface. The filter includes a cylindrical filter arranged to be rotatable, a driving means for rotating the filter, and a steam source connected to the base end side of the nozzle, and the filter is rotated by the driving means and the filter is rotated. , a filter cleaning device for cleaning a filter with steam injected from each cleaning nozzle hole of the nozzle, wherein an adjustment rod is provided in the nozzle to gradually reduce the cross-sectional area of the steam flow path from the base end to the tip end; A filter cleaning device characterized by arranging. 2. The filter cleaning device according to claim 1, wherein the driving means is steam injected from each cleaning nozzle hole. 3. The filter cleaning device according to claim 1, wherein the driving means is steam injected from a driving nozzle hole that the nozzle has separately from the cleaning nozzle hole. 4. Utility model registration claim 3, characterized in that the cleaning nozzle hole is oriented perpendicularly to the filter surface, and the driving nozzle hole is inclined tangentially to the filter surface. The filter cleaning device described. 5 Utility model registration claim 1, characterized in that the nozzle is inserted into the filter.
The filter cleaning device according to item 1, 2, 3, or 4. 6. The filter cleaning device according to claim 1, 2, 3 or 4, wherein the nozzle is disposed close to the outside of the filter. 7. The adjustment rod is a round bar with an outer diameter that is approximately the same as the inner diameter of the cylindrical nozzle, and the portion facing each cleaning nozzle hole is a flat surface that gradually slopes toward the axis from the tip to the base end. Utility model registration claims 1, 2, 3, 4, and 5 are characterized in that they are formed by cutting.
6. The filter cleaning device according to item 6.