JP5880204B2 - Filter and filtration device - Google Patents

Description

  The present invention relates to a filter installed in a pipe and a filtration device.

  In a filtration device for filtering paint, a filter is generally installed in a pipe in order to remove paint residue (solidified matter) solidified by drying or friction. In such a filtration device, paint residue accumulates on the filter. Therefore, laborious work such as cleaning or replacement of the filter is periodically required. Therefore, Patent Document 1 discloses a filtration device that can solve such a problem. In the filtration device disclosed in Patent Document 1, a filter having conductivity is used. Therefore, the filter generates heat when energized. When the paint contains a material having thermoplasticity, the paint residue is softened by the heat generated by the filter, and becomes a small residue that does not interfere with the painting. Therefore, it is possible to reduce the frequency of cleaning work or replacement work.

Japanese Patent Laid-Open No. 11-166409

  In the filtration apparatus as described above, the flow rate of the coating material in the pipe generally increases as it approaches the center of the pipe. Accordingly, the flow rate of the paint increases as it approaches the center of the filter, so that the center of the filter is most easily deprived of heat. However, in the configuration in which the filter generates heat uniformly as in the filtration device described in Patent Document 1, there is a high possibility that the paint residue deposited at the center of the filter is not sufficiently heated. Therefore, the paint residue is not made fine and the center of the filter is particularly easily clogged.

  Then, an object of this invention is to provide the filter and filtration apparatus which are hard to clog.

  In order to achieve the above object, the filter of the present invention has an annular member that can be in close contact with the inside of a pipe, and a linear electric heating member that partitions the internal opening of the annular member in a mesh shape, and the internal opening The amount of heat per unit area of the internal opening generated from the electric heating member located in the central region is larger than the amount of heat per unit area generated from the electric heating member located in the peripheral region outside the central region.

  In order to achieve the above object, a filtration device according to the present invention includes the filter, a pipe in which the filter is in close contact with the inside, and a power source capable of supplying a current to the filter from the outside of the pipe.

  In order to achieve the above object, another filtering device of the present invention is a filter having an annular member, an electric heating member that partitions the internal opening of the annular member in a mesh shape, and an insulating member that covers the electric heating member. And a pipe in which the filter is in close contact with the inside, a first wiring electrically connected to the electric heating member located in a central region of the internal opening, and a peripheral region outside the central region A second wiring electrically connected to the electric heating member; a first power source for supplying current to the electric heating member from the outside of the pipe through the first wiring; and the second electric power from the outside of the pipe. And a second power source for supplying a current smaller than that of the first power source through the wiring.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the filter and filtration apparatus which are hard to clog.

It is a figure which shows schematic structure of the filtration apparatus of Embodiment 1. FIG. It is a front view of the filter shown in FIG. It is sectional drawing which shows the form with which the electrothermal member of the filter shown in FIG. 2 was coat | covered with the insulating member. It is a figure which shows schematic structure of the filtration apparatus of Embodiment 2. FIG. It is a figure which shows schematic structure of the filtration apparatus of Embodiment 3. FIG. It is a figure which shows schematic structure of the filtration apparatus of Embodiment 4. It is a figure which shows the connection structure of the power supply and filter using electromagnetic induction. It is a figure which shows the connection structure of the power supply and filter which used piping which has a joint part.

(Embodiment 1)
A first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a schematic configuration of the filtration device according to the first embodiment. In the filtration device 1 shown in FIG. 1, the paint flows inside the pipe 2. This paint includes a thermoplastic material and a solvent that dissolves the material. A filter 3 is attached inside the pipe 2. FIG. 2 is a front view of the filter shown in FIG.

  The filter 3 shown in FIG. 2 has an annular member 4 that can be in close contact with the inside of the pipe 2. The internal opening of the annular member 4 is partitioned into a mesh by a linear electric heating member 5. In the present embodiment, the electrothermal member 5 positioned in the central region A of the internal opening (the region whose distance from the center of the internal opening is shorter than ½ of the radius of the internal opening) is placed in the peripheral region outside the central region A. It is formed of a material having a higher resistivity than the electric heating member 5 positioned. As shown in FIG. 1, the electric heating member 5 is electrically connected to a power source 7 through a wiring 6.

  Inside the pipe 1, due to the effect of the viscosity of the paint, the flow velocity of the paint has a distribution that increases as it approaches the center of the pipe 1. For this reason, the central region A of the filter 3 is more easily deprived of heat than the peripheral region. However, in the filter 3 of the present embodiment, the electric resistance of the electric heating member 5 located in the central region A is larger than the electric resistance of the electric heating member 5 located in the peripheral region. Therefore, when the power source 7 supplies current to the electric heating member 5 through the wiring 6, the amount of heat per unit area generated from the electric heating member 5 located in the central region A is the unit area generated from the electric heating member 5 located in the peripheral region. It becomes larger than the amount of heat per hit. As a result, a sufficient amount of heat is secured to heat the paint residue 9 deposited in the central region A of the filter 3 to form fine particles. As a result, the paint residue 9 becomes fine particles and passes through the filter 3 (see FIG. 1). Therefore, the filter 3 is not easily clogged.

  The electrothermal member 5 of the present embodiment is configured to use two types of materials having different electrical resistances, but the present invention is not limited to this configuration. For example, the cross-sectional area of the electric heating member 5 located in the central area A may be smaller than the cross-sectional area of the electric heating member 5 located in the peripheral area. According to this structure, the electrothermal member 5 can be comprised with one type of raw material. However, in the case of this configuration, the opening width of the central region A is larger than the opening width of the peripheral region. Therefore, in the case of this configuration, as shown in FIG. 3, the electric heating member 5 located in the central region A is covered with the insulating member 8a (first insulating member), and the electric heating member 5 located in the peripheral region is The outer diameter R1 is covered with the same insulating member 8b (second insulating member) as the insulating member 8a. Thereby, a difference in opening width between the central area A and the peripheral area of the filter 3 does not occur.

  In the present embodiment, when the paint has electrical conductivity, the paint may change in quality when the paint comes into contact with the electrically heated member 5 that is energized. Therefore, as shown in FIG. 3, it is possible to prevent the paint from being altered by covering the electrothermal member 5 with the insulating members 8a and 8b.

(Embodiment 2)
A second embodiment of the present invention will be described. FIG. 4 is a diagram illustrating a schematic configuration of the filtration device according to the second embodiment. Constituent elements similar to those of the filtration device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The filtration device 10 shown in FIG. 4 has a configuration in which a flow rate measurement unit 11 and a control unit 12 are added to the filtration device 1 of the first embodiment. The flow rate measuring unit 11 measures the flow rate of the paint before passing through the filter 3 inside the pipe 2 and sends the measured value to the control unit 12. The control unit 12 controls the current of the power source 7 in association with the measurement value of the flow rate measurement unit 11. The greater the flow rate of the paint before passing through the filter 3, the greater the amount of heat taken away from the heat generating member 5 that has generated heat. Therefore, in the filtration device 10 of the present embodiment, the control unit 12 increases the output current of the power source 7 when the measurement value of the flow rate measurement unit 11 exceeds the allowable range. On the contrary, when the measurement value of the flow rate measurement unit 11 falls below the allowable range, the control unit 12 decreases the output current of the power source 7. Thereby, even if the flow rate of the coating material in the pipe 2 changes, the temperature of the electric heating member 5 can be managed so that the coating residue 17 can be sufficiently heated.

(Embodiment 3)
Embodiment 3 of the present invention will be described. FIG. 5 is a diagram illustrating a schematic configuration of the filtration device according to the third embodiment. Constituent elements similar to those of the filtration device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The filtration device 20 shown in FIG. 5 has a configuration in which a temperature measurement unit 21 and a control unit 22 are added to the filtration device 1 of the first embodiment. The temperature measurement unit 21 measures the temperature of the filter 3 and sends the measurement value to the control unit 22. The temperature measuring unit 21 is preferably a small temperature sensor so as not to disturb the flow of the paint 2. Furthermore, the measurement region of the temperature measurement unit 21 is preferably the central region A of the filter 3 where heat is most easily removed.

  The control unit 22 controls the current of the power supply 7 in association with the measurement value of the temperature measurement unit 21. When the flow rate of the paint increases inside the pipe 2, the amount of heat taken away from the electrically heated member 5 increases, and the temperature of the electrically heated member 5 decreases. Therefore, in the filtration device 20 of the present embodiment, the control unit 22 increases the current of the power source 7 when the measured value of the temperature measurement unit 21 falls below the allowable range. On the contrary, when the measured value of the temperature measuring unit 21 exceeds the allowable range, the control unit 22 decreases the current of the power source 7. Thereby, even if the temperature of the electrothermal member 5 changes, it becomes possible to manage the temperature of the electrothermal member 5 so that the coating residue 17 can be heated sufficiently. Since the filtering device 20 of the present embodiment directly measures the temperature of the filter 3, it is possible to manage the temperature of the electric heating member 5 more accurately than the filtering device 10 of the second embodiment.

(Embodiment 4)
Embodiment 4 of the present invention will be described. FIG. 6 is a diagram illustrating a schematic configuration of the filtration device according to the third embodiment. In FIG. 6, the description of the pipe 2 is omitted. The same code | symbol is attached | subjected about the structure similar to the filtration apparatus 1 of Embodiment 1, and detailed description is abbreviate | omitted.

  In the filtration device 30 shown in FIG. 6, the electrothermal member 5 is the same material and has the same shape regardless of the arrangement location. Furthermore, in this embodiment, the electrothermal member 5 is covered with an insulating member. The electric heating member 5 located in the central region A shown in FIG. 6 is electrically connected to the wiring 6a (first wiring). The electric heating member 5 located in the central region A is supplied with current from the power source 7a (first power source) through the wiring 6a. The electrothermal member 5 located in the peripheral region outside the central region A is electrically connected to the wiring 6b (second wiring). The electric heating member 5 located in the peripheral region is supplied with current from the power source 7b (second power source) through the wiring 6b. This current is smaller than the current of the power source 6a.

  In the filtering device 30 configured as described above, the electric heating member 5 located in the central region A is supplied with a larger current than the electric heating member 5 located in the peripheral region. As a result, since the temperature of the electrothermal member 5 is higher in the central area A than in the peripheral area (the amount of heat is larger), a sufficient amount of heat is ensured to heat the paint residue 9 deposited in the central area A to make fine particles. Is done. Therefore, the filter 30 of this embodiment also becomes difficult to clog the filter 3 similarly to the filter apparatus of other embodiment. Furthermore, in the filtration apparatus 30 of this embodiment, the electrothermal member 5 can be made of the same material and the same shape regardless of the arrangement location. Therefore, it becomes possible to reduce the manufacturing cost of the electrothermal member 5.

  As described above, the present invention has been described with reference to the embodiment. However, in the present invention, the electrical connection configuration between the filter and the power source is not particularly limited. Hereinafter, an example of the connection configuration will be described.

  FIG. 7 is a diagram illustrating a connection configuration between a power source and a filter using electromagnetic induction. In FIG. 7, a power receiving coil 41 is built in the pipe 2. The power receiving coil 41 is electrically connected to the electric heating member 5 of the filter 3. A power transmission coil 42 is installed at a position facing the power reception coil 41 outside the pipe 2. A power source 7 is connected to the power transmission coil 42. When the power source 7 passes a current through the power transmission coil 42, a current flows through the power receiving coil 41 to the heating member 5 of the filter 3 by electromagnetic induction.

  FIG. 8 is a diagram showing a connection configuration between a power source and a filter using a pipe having a joint (so-called sanitary pipe). In FIG. 8, a joint portion 43 is provided at one end of each of the pipes 2a and 2b so as to continuously surround the outer peripheral surface of each pipe in the circumferential direction. The piping 2a and the piping 2a are brought into close contact so that the wiring 6 is sandwiched between the joint portions 43. The filter 3 is sandwiched between the pipe 2a and the pipe 2a.

  In addition, the filter 3 may be sandwiched between a pair of O-rings that can be in close contact with the inside of the pipe 2, and the wiring may be drawn out of the wiring 2 through the O-ring.

DESCRIPTION OF SYMBOLS 1, 10, 20, 30 Filtration apparatus 2, 2a, 2b Piping 3 Filter 4 Ring member 5 Electric heating member 6, 6a, 6b Wiring 7, 7a, 7b Power supply 8a, 8b Insulation member 9 Paint residue 11 Flow measurement part 12, 22 Control part 21 Temperature measurement part 41 Power receiving coil 42 Power transmission coil 43 Joint part

Claims (10)

An annular member that can be in close contact with the inside of the pipe;
A linear electric heating member that partitions the internal opening of the annular member into a mesh shape,
The amount of heat per unit area of the internal opening generated from the electric heating member located in the central region of the internal opening is greater than the amount of heat per unit area generated from the electric heating member located in the peripheral region outside the central region. Also big, filter.   The filter according to claim 1, wherein the electric heating member located in the central region is formed of a material having a higher resistivity than the electric heating member located in the peripheral region.   The filter according to claim 1, further comprising an insulating member that covers the electric heating member. The cross-sectional area of the electric heating member located in the central region is smaller than the cross-sectional area of the electric heating member located in the peripheral region;
A first insulating member covering the electric heating member located in the central region; a second insulating member covering the electric heating member located in the peripheral region; and having the same outer diameter as the first insulating member; The filter according to claim 1, comprising: A filter according to any one of claims 1 to 4,
Piping in which the filter is in close contact with the inside;
A power source capable of supplying current to the filter from outside the piping;
Having a filtration device. A flow rate measuring unit that measures the flow rate of the liquid before passing through the filter inside the pipe,
A control unit for controlling the current of the power supply in association with the measurement value of the flow rate measurement unit;
The filtration device according to claim 5, further comprising: A temperature measuring unit for measuring the temperature of the filter;
A control unit for controlling the current of the power supply in association with the measurement value of the temperature measurement unit;
The filtration device according to claim 5, further comprising:   The said temperature measurement part is a filtration apparatus of Claim 7 which measures the temperature of the center area | region of the said filter. A power receiving coil built in the pipe and electrically connected to the filter;
The filtration device according to any one of claims 5 to 8, further comprising a power transmission coil facing the power reception coil outside the pipe and electrically connected to the power source. A filter having an annular member, an electric heating member that partitions the internal opening of the annular member into a mesh shape, and an insulating member that covers the electric heating member;
Piping in which the filter is in close contact with the inside;
A first wiring electrically connected to the electric heating member located in a central region of the internal opening;
A second wiring electrically connected to the electric heating member located in a peripheral region outside the central region;
A first power source for supplying current to the electric heating member from the outside of the pipe through the first wiring;
A second power source for supplying a smaller current than the first power source from the outside of the pipe through the second wiring;
Having a filtration device.