JPH0531308A - Multistage type filter for continuous operation - Google Patents

Abstract

PURPOSE:To obtain a filter wherein production is not stopped in replacement and inspection of a filter medium and the service life thereof is prolonged and loss of the substance to be filtered is made little and, furthermore, analysis of a foreign matter clogged to the filter medium is easily performed. CONSTITUTION:As three systems of a unit filter, three systems A, B, C are arranged so that a filter A1, 9, a filter B1, 10 and a filter C1, 11 are respectively equipped with shut-off valves A1, A3, 3, 6 and shut-off valves B1, B2, A, 7 and shut-off valves C1, C3, 5, 8 in the fronts and the rears of the filters. These three unit filters are provided as a first step. The mesh of the filter medium of the filters is made rougher than the mesh of the filter medium of a filter A2, 18, a filter B2, 19 and a filter C2, 20 of a second-step filters. As a method for using these filters, for example, continuous operation can be performed by changing over opening/closing of the shut-off valves. In this case, any filter system may be selected in the first step, and further, fluid and powder can flows to the second step from the first step through any of three filters by using the common pipe at every step of the unit filters of the respective systems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for removing foreign matters such as fluid and powder. Particularly, the present invention relates to a filter device for handling a filter substance that is easily clogged.

[0002]

2. Description of the Related Art In the past, a pressure detector was installed in a filter, and shut-off valves were installed in front of and behind the filter, respectively. A unit filter device was used, and the filter material attached to the filter was adjusted to the minimum mesh of the substance to be filtered. It was provided.

[0003]

However, when handling a filter substance that is easily clogged in such a unit filtration device, the pressure detector of the filter immediately notifies the clogging, and frequent replacement of the filter medium is required. It had to be done, and the production flow had to be stopped each time. In this case, the filter material and the filter substance are also consumed in a large amount, which is uneconomical, and it is difficult to analyze foreign substances clogging the filter material.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, to extend the life of the filter medium, to reduce the loss of the filter substance, and to prevent foreign substances from clogging the filter medium, without stopping the production by replacing or inspecting the filter medium. The object is to provide a filtration device that is easy to analyze.

[0005]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a filter unit with a pressure detector, and a filter unit with front and rear shutoff valves. A filter mesh that is installed in a system and in which two or more unit filtration devices are installed in series in each system, and the filter media mesh that is installed in the unit filtration device that is installed upstream is installed in the unit filtration device that is installed in the downstream system. It is achieved by a multi-stage continuous operation filtration device which is characterized in that it is made coarser and unit filters of each system are connected by a common pipe for each stage and alternately switched.

The present invention can be used without any particular limitation on the type of filter material used.

It is convenient for automatic control to use a solenoid valve as the stop valve used in the present invention.

In the present invention, the provision of three systems of the unit filtration device in parallel with the flow path means that the two systems are constantly switched,
By having one system as a backup, it is possible to prevent the production line from being stopped by the filtration device in any event. Also, the three systems may be switched sequentially.

In the present invention, by making the mesh of the filter medium mounted on the upstream unit filtration device coarser than the mesh of the filter medium mounted on the downstream unit filtration device, coarse particles are filtered by the preceding filtration unit. Since fine particles are filtered by the next filtration device, the time until clogging of the filter medium becomes long, that is, the life of the filter medium is kept long, and the filter medium at the subsequent stage is selected to be finer than the conventional mesh. It is also possible to increase the filtration efficiency.

By connecting the unit filtration devices of each system with a common pipe for each stage and alternately switching and using them, it is possible to further increase the degree of freedom of operation of the devices and increase the filtration efficiency. Can be done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the multi-stage continuous operation filtration device of the present invention having two stages will be described with reference to the drawings. However, the present invention is not limited to this embodiment. It may be 3 steps or 4 steps.

As shown in FIG. 1, arrows indicate the directions of flow of fluid and powder. The three systems of unit filtration device are A, B,
Filters A1 (9), Filter B1 (10),
The filter media C1 (11) are provided with shut-off valves A1, A3 (3,
6), stop valves B1, B3 (4, 7), stop valves C1, C3
It is arranged with (5, 8) before and after the filter,
The three unit filtration devices are the first stage. The filter material mesh of the filter is a filter A1 (9), a filter B1 (10),
The filter C1 (11) has the same mesh, and the second stage filter A2 (18), filter B2 (19), and filter C
2 Make it coarser than the filter mesh of (20).

For example, for opening and closing the shutoff valve, I, II and III in Table 1 are used.
Continuous operation can be performed by switching to the order of. At this time, any filtration system may be selected in the first stage,
In addition, the fluid and powder can be made to flow from any of the three filters from the first stage to the second stage by using a common pipe for each stage of the unit filtration device of each system.

[0014]

[Table 1]

In addition, in the normal flow of I or II in Table 1, I
If there is something wrong with II, you can put it in II state. When the filter material of the filter device is clogged, it can be seen that the pressure applied to the filter rises. Therefore, pressure detectors 21, 22, 23, 24, 25, 26 are attached to each filter and used. A solenoid valve is used as the shut-off valve attached to the filter, and a circuit is electrically constructed as shown in Table 1 to open and close the shut-off valve, so that I, II, and III situations are automatically selected depending on the pressure level. That is, when the pressure of the filter A1 is increased during use, the condition II is set, and when the pressure is increased during use of the filter B1 I
To the state of. When switching from the state I to the state II, and from the state II to the state I, it is necessary to temporarily set a time for opening both the closing valves. The same applies when III changes. The second and subsequent stages follow the same principle. As the number of stages of the filter medium of the filter increases, the mesh becomes thinner toward the downstream side of the flow. Replace and check the filter when the stop valves before and after the filter are closed.
When the electric circuit cannot be assembled, the shutoff valve can be opened and closed manually by looking at the pressure detector.

[0016]

EFFECTS OF THE INVENTION The filtration apparatus for multistage continuous operation according to the present invention enables replacement and inspection of the filtration apparatus without stopping the flow of the pipe line.

(2) Since the load applied to the filter is divided into large and small for each mesh, the number of times the filter medium needs to be replaced is reduced.

Since the pressure is used for detection, the foreign matter removing operation is made uniform.

4. Foreign matter analysis is easy because the size of the foreign matter is constant.

5 When the equipment for controlling the flow of fluid and powder is operated, it can be operated so that it cannot be operated unless the valve of the closing valve of any one of the filters of each stage is opened.

[Brief description of drawings]

FIG. 1 is a flow sheet diagram showing a two-stage device of a multi-stage type continuous operation filtration device of the present invention.

[Explanation of symbols]

 1 main pipe 2 main valve 3 stop valve A1 4 〃 B1 5 〃 C1 6 stop valve A3 7 〃 B3 8 〃 C3 9 filter A1 10 〃 B1 11 〃 C1 12 stop valve A2 B2 15 〃 14 16 〃 B4 17 〃 C4 18 Filter A2 19 〃 B2 20 〃 C2 21 Pressure detector A1 22 〃 B1 23 〃 C1 24 〃 A2 25 〃 B2 26 〃 C2

Claims (1)

Claim: What is claimed is: 1. A filter is provided with a pressure detector, a filter is provided with shut-off valves in front of and behind the filter, and three system units are installed in parallel in a flow path. In each case, two or more unit filtration units of the previous term are installed in series, and the filter medium mesh attached to the unit filtration device installed first upstream is made coarser than the mesh of the filter medium attached to the unit filtration device installed downstream, and A multistage continuous operation filtration device characterized in that the unit filtration devices of each system are connected by a common pipe for each stage and alternately switched.