JP3130420U - Electrostatic oil purifier - Google Patents

Abstract

An electrostatic oil purifier that reduces the operation cost and the amount of waste by shortening the purification time by increasing the purification speed of the electrostatic oil purifier and enabling repeated use of the collector. provide.
An oil purification tank 1 as an essential part of an electrostatic oil purifier is provided with an inflow port 2 and an outflow port 9, and a ground electrode 4 and a high voltage electrode 7 formed of a metal porous plate and a metal mesh are accordion-shaped. The collector 6 formed by being bent to be fixed to the metal porous flat plate is disposed, and the purification rate is obtained by allowing the oil to flow across the collector 6, the high voltage electrode 7, and the ground electrode 4 in the oil purification tank 1. By improving the process, the purification time can be shortened and the collector can be used repeatedly, which helps to reduce the operating cost and waste amount of the electrostatic oil purifier.
[Selection] Figure 1

Description

  In the present invention, a negative electrode is formed by a metal porous plate, a metal mesh bent in a bellows shape is fixed to the surface of the metal porous plate, a collector is formed, and oil is allowed to flow across the negative electrode and the collector. The present invention relates to an electrostatic oil purifier capable of improving the purification speed and allowing repeated use of a collector.

  The existing electrostatic oil purifier has a slow purification speed and uses a disposable collector made of a dielectric material. (Patent Publication Hei 7-96216 “Cylindrical electrostatic oil purifier”)

  Most of the power consumption of the electrostatic oil purifier is due to the heater used to lower the viscosity of the oil, and shortening the purification time by improving the purification speed reduces the power consumption, that is, reduces the operating cost. It leads to. In addition, since existing electrostatic oil purifiers use a collector made of a dielectric material, they must be replaced with new ones if used for a certain period of time, which increases the operating cost of electrostatic oil purifiers and Becomes waste. Therefore, by improving the purification speed and allowing the collector to be used repeatedly, it is possible to reduce the operating cost related to the electrostatic oil purifier and reduce the amount of waste.

  The intensity of the electric field formed on or near the collector surface is proportional to the ratio of the difference between the relative permittivity of the collector material and the relative permittivity of oil and the sum. In the case of a conductive material such as a metal, the relative dielectric constant can be regarded as infinite, so the value of the ratio is 1. On the other hand, the collector material incorporated in the existing electrostatic oil purifier has a relative dielectric constant of about 5 and the relative dielectric constant of a general oil is 2.2. Is about 0.44, which is much smaller than when a metal material is used. The present invention uses a metal mesh for the collector to increase the electric field strength formed on and near the collector surface, and to increase the collector surface area by bending the metal mesh in a bellows shape, thereby improving the purification rate. This shortens the purification time and solves problems related to operating costs.

  The electrostatic induction charge appearing on the surface of the metal mesh of the collector is inserted alternately between the yin and yang electrodes by alternately changing the direction one by one so that the charge polarity of the contaminant particles is reversed in any collector. It is intended to further improve the trapping efficiency of contaminants and shorten the purification time, thereby further contributing to the solution of problems related to operating costs.

  If contaminants accumulate on the collector, the purification performance deteriorates. Therefore, in an existing electrostatic oil purifier employing a collector made of a dielectric material, it is necessary to periodically replace the collector with a new one. In the present invention, by using the collector of the metal mesh, it is possible to repeatedly use the collector on which the contaminants are accumulated, thereby solving the problem of the operation cost of the electrostatic oil purifier and the generation of waste.

  As described above, the electrostatic oil purifier according to the present invention has a plurality of metal porous flat plates arranged in parallel at equal intervals as yin and yang electrodes, and a metal mesh bent in a bellows shape on the metal porous plates between the yin and yang electrodes. The fixed collector is inserted one by one, and the purification rate is improved by flowing oil across the yin and yang electrode and the collector, and the collector can be washed and reused. It helps to reduce the costs associated with the operation of the electrostatic oil purifier and the amount of waste.

  The casing of the oil purification tank is constituted by a tube having a rectangular cross section, a lower lid, and an upper lid. Plastic insulating plates having appropriate strength and rigidity are respectively installed on a pair of two faces and a bottom face of the inner face of the oil purification tank. The set of insulating plates installed on the side surface is processed with a plurality of grooves that allow the collector and the yin and yang electrode to be arranged at appropriate intervals without contact, and an oil purification tank that serves as a ground electrode It is possible to insert an appropriate number in the order of the collector, the high voltage electrode, the collector, and the ground electrode in order from the inner wall. Two collector insertion grooves between the yin and yang electrodes are processed between adjacent yin and yang electrodes, so that an appropriate distance from the yin and yang electrode can be maintained regardless of the direction of the collector.

  All the high voltage electrodes are connected to each other by a metal plate or a metal wire, and similarly all the ground electrodes are connected to each other by a metal plate or a metal wire. The high voltage terminal pin having a push-up mechanism by a spring disposed on the lower lid of the oil purification tank is brought into contact with the connected high voltage electrode, and the inner surface of the oil purification tank upper lid is brought into contact with the connected ground electrode through a metal spring. By doing so, the electrical connection is ensured.

  The oil flows into the oil purification tank from the upper part of the oil purification tank, forms an internal flow path so that the flow of oil in the oil purification tank is less biased, crosses the collector and the yin and yang electrode, and an outlet provided at the lower part of the oil purification tank The composition will flow out of The interval between a pair of negative and positive electrodes and the magnitude of applied voltage are set so that the average electric field strength between adjacent negative and positive electrodes is about 0.5 to 0.6 kV / mm. In the case of purification, the average electric field strength is lowered by lowering the applied voltage or increasing the interval between the yin and yang electrodes, and it is possible to take measures corresponding to the oil type. The mesh size of the metal mesh fixed to the collector surface is about 100 mesh.

  Embodiments will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of the oil purification tank 1. Oil flows into the upper space 3 in the oil purification tank from an inlet 2 (shown by a broken line) on the upper side of one side of the oil purification tank 1, and along the metal ground electrode connecting plate 4a in FIG. As shown by the arrow, the space below the ground electrode connecting plate 4a is branched through two rectangular ports (not shown) processed at both ends of the ground electrode connecting plate 4a. It has a structure that flows into 5 (hereinafter referred to as an oil purification section).

  The oil that has flowed into the oil purification unit 5 crosses the collector 6, the high voltage electrode 7, and the ground electrode 4, and flows out from an outlet 9 provided in the center of the oil purification tank lower lid 8. The thick arrow described in FIG. 1 shows the outline of the oil flow. In FIG. 1, six collectors, three high-voltage electrodes, and two ground electrodes are inserted, but the number of collectors 6, high-voltage electrodes 7, and ground electrodes 4 is determined according to the size of the oil purification tank. Change.

  When most of the contaminants in the oil are charged positively, for example, and when the high voltage electrode 7 is a cathode, the second and fifth sheets in total from the right side in FIG. By reversing the orientation of the collectors in the direction shown in the figure, electrostatic charge induced in the opposite polarity to the charged polarity of contaminants appears on the metal mesh side of all the collectors, thereby further capturing contaminants. It becomes easy to break.

  FIG. 2 is a cross-sectional view of the oil purification unit 5. As shown in FIG. 2, two side insulating plates 10 are installed in parallel, and a groove is formed in the side insulating plate 10 so that the high voltage electrode 7, the ground electrode 4, and the collector 6 can be inserted at predetermined intervals. It is processed at a predetermined interval. All the high-voltage electrodes 7 are fixed and connected to each other by a metal bottom plate (hereinafter referred to as a high-voltage electrode connecting plate) 7a. The high-voltage electrode connecting plate 7a is connected to the side insulating plate 10 and the bottom insulating plate 11. The position is fixed by being sandwiched by. Side insulating plate 10 and bottom insulating plate 11 are coupled to each other by bolts (not shown) and integrated.

  The output of the DC high voltage power source (not shown) is applied to the high voltage electrode 7 by contacting a high voltage terminal pin (not shown) having a push-up mechanism by a spring (not shown) and the high voltage electrode connecting plate 7a. Connected. The casing of the oil purification tank 1 is all grounded, and the casing and the ground electrode connecting plate 4a are electrically connected using a metal spring 12. The ground electrode connection plate 4 a is supported by the side surface insulating plate 10.

It is a longitudinal cross-sectional view which shows the structure of the oil purifier tank which is the principal part of the electrostatic oil purifier of this invention. It is a cross-sectional view of the oil purification tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil purifier 2 Inflow port 3 Oil purifier upper space 4 Ground electrode 4a Ground electrode connecting plate 5 Oil purifier 6 Collector 7 High voltage electrode 7a High voltage electrode connecting plate 8 Oil purifier lower lid 9 Outlet 10 Side surface insulating plate 11 Bottom insulating Plate 12 Spring

Claims (3)

  Yin and yang electrodes composed of a metal flat plate with a large number of holes (hereinafter referred to as a metal perforated plate) are arranged in parallel at an equal interval, and a filter medium (hereinafter referred to as a collector) is arranged in parallel between the yin and yang electrodes. In the electrostatic oil purifier, (1) a collector is constructed by fixing a metal mesh bent in a bellows shape to the surface of a metal porous flat plate; An electrostatic oil purifier characterized by improving the purification rate by flowing   2. The electrostatic oil purifier according to claim 1, wherein the polarity of the electrostatic induction charge appearing on the surface of the bellows-like metal mesh fixed to the collector is opposite to the charged polarity of the contaminant in the oil. An electrostatic oil purifier that can change the direction of collectors one by one in accordance with the charge polarity of an object, thereby improving the purification speed.   The electrostatic oil purifier according to claim 1, wherein the collector can be repeatedly used by being cleaned by forming the collector with a metal.

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