JP2010172823A - Device for removing fine iron-powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for removing fine iron-powder that can treat a raw material of a high temperature or a low temperature without restriction and allows an operator to easily wash the device and to easily carry out a maintenance work. <P>SOLUTION: The device for removing fine iron-powder including a magnetic element 5 and a pipe 3 for housing the magnetic element 5, capable of removing fine iron-powder mixed in a raw material flowing around the outer circumference of the pipe 3, is characterized in that a gap between the magnetic element 5 and the pipe 3, and hollow parts formed inside the magnetic element 5 are used as flow paths of a heat medium. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the fields of food industry, chemical industry, ceramic industry, etc., the present invention is a magnetic material (such as “fine iron powder” in this specification) such as equipment wear powder and fine iron powder mixed in fluid raw materials. For the purpose of removing.), The present invention relates to a fine iron powder removing device used by being installed in the middle of a pipeline through which raw materials flow.

  Conventionally, in the fields of food industry, chemical industry, ceramic industry, and the like, a fine iron powder removing device has been widely used to remove fine iron powder mixed in a raw material having fluidity (see, for example, Patent Document 1). ).

  In this fine iron powder removing device, as shown in FIGS. 1 to 2, a magnetic element 5 composed of a permanent magnet 5a and a yoke 5b, and a magnetic element 5 are provided in a duct 1d through which a fluid raw material flows. A main body 1 having a pipe body 3 to be housed is arranged, and fine iron powder mixed in a raw material flowing in the pipe line 1d is adsorbed to the surface of the pipe body 3 in which the magnetic element 5 is housed. Are to be removed.

In this case, the connection shape of the inlet 1a and outlet 1b of the fine iron powder removing device and the pipe 1d through which the raw material flows can be easily attached / detached by the ferrule joint 11 in consideration of workability during maintenance and the like. It has a possible structure.
Similarly, the connection shape between the main body 1 and the magnet body 2 of the fine iron powder removing device has a structure that can be easily attached and detached by the ferrule joint 11 in consideration of workability during maintenance and the like. .

  In addition, the magnet body 2 including the tube body 3 and the magnetic element 5 is arranged in a zigzag manner when the magnet body 2 is mounted on the main body 1. The tubular body 3 configured as described above, the tubular body 4 that communicates with each tubular body 3 and holds each tubular body 3 via the partition wall 4a, and has approximately the same length as the tubular body 3, and the tubular body 3 and the tubular body 4, the magnetic element 5 that slides between the inside, the connecting plate 8 that fixes the end of each magnetic element 5, and the magnetic element 5 are placed inside the tube body 3 (when removing fine iron powder thereby. , The magnetic force of the magnetic element 5 can act on the surface of the tubular body 3) and in the cylindrical body 4 (with this, when performing maintenance work, the magnetic element 5 is disposed on the surface of the tubular body 3. Magnetic force can be prevented from acting. So that consist fixed gripping portion 7 for forming the end of the rod 9 to the connecting plate 8.

  By the way, the removal efficiency of the fine iron powder by this kind of fine iron powder removing apparatus is determined by the number of magnetic lines of force that pass through the fine iron powder particles mixed in the raw material. By increasing the absolute number of magnetic elements 5 and the number of permanent magnets 5a arranged in the magnetic field lines, the magnetic line density in the vicinity of the magnetic elements 5 increases, resulting in an improvement in the capture probability and removal efficiency of fine iron powder. To do.

  The permanent magnet 5a constituting the magnetic element 5 has a structure in which the opposing surfaces are brought into close contact with each other through the yoke 5b having the effect of efficiently releasing magnetism, and the lines of magnetic force are efficiently emitted to the outside by a repulsive magnetic field. It has become.

As the permanent magnet 5a, a rare earth neodymium magnet is usually used because the magnetic flux density is high, and the strongest magnetic field among the permanent magnets currently on the market can be obtained. Easy to obtain.
On the other hand, a disadvantage is that the Curie point indicating thermal demagnetization is low and the reversible range is particularly narrow. This reversible range is the temperature range where the magnetic line density at normal temperature is maintained when the permanent magnet is heated to a certain temperature. It means not to do.
The reversible range for the thermal demagnetization of a neodymium magnet is generally about 70 to 80 ° C., and must be used below this temperature.
Therefore, when the temperature of the raw material to be processed is high, for example, in the case of molten chocolate, cocoa, liquid food after heat sterilization, etc., cleaning and sterilization may be performed at a high temperature (for example, high temperature steam reaching 150 ° C.). ), For example, the CIP (cleaning in place) stationary cleaning method (cleaning method that cleans equipment piping without disassembling) and SIP (sterilizing in place) When adopting a stationary sterilization system (sterilization system that sterilizes equipment piping without disassembling), there is a problem that the permissible temperature of the permanent magnet is much higher and the fine iron powder removing device cannot be used.

  On the other hand, when the temperature of the raw material to be processed is below freezing point, such as ice cream, soft cream, ice confectionery such as sherbet, etc., about several tens of minutes to several hours from the start of operation of fine iron powder removal processing, Although the fine iron powder removing device operates normally, the raw material to be processed is frozen around the pipe body 3 in which the magnetic element 5 of the fine iron powder removing device is accommodated when the operating time is reached. There was a problem that the fluidity of the oil was lost and the operation was stopped.

  For these reasons, in the conventional fine iron powder removal equipment, the raw materials that can be processed are limited to about room temperature, the raw materials at high and low temperatures are extremely difficult to process, and a great deal of labor is required for equipment cleaning and maintenance work. There was a problem that it took.

Japanese Patent No. 2647597

  In view of the problems of the conventional fine iron powder removing device, the present invention can process high-temperature and low-temperature raw materials without restriction, and can easily perform equipment cleaning and maintenance work. An object is to provide a removal device.

  In order to achieve the above object, a fine iron powder removing apparatus of the present invention comprises a magnetic element and a tubular body in which the magnetic element is accommodated, and the fine iron mixed in the raw material flowing in the outer peripheral portion of the tubular body. In the fine iron powder removing apparatus for removing powder, a gap between the magnetic element and the tubular body and a hollow portion formed inside the magnetic element are used as a flow path of the heat medium.

  In this case, the heat medium for cooling can be circulated from the hollow portion formed inside the magnetic element to the gap between the magnetic element and the tubular body.

  Moreover, the heat medium for heating can be distribute | circulated to the hollow part formed in the inside of a magnetic element from the clearance gap between a magnetic element and a tubular body.

  According to the fine iron powder removing device of the present invention, the gap between the magnetic element and the tubular body and the hollow portion formed inside the magnetic element are used as the flow path of the heat medium, so that the pipe containing the magnetic element and the magnetic element is stored. The body can be cooled (in the case of a high temperature raw material) or heated (in the case of a low temperature raw material) by a heat medium that circulates through the gap between the magnetic element and the tube and the hollow portion formed inside the magnetic element. As a result, high temperature and low temperature raw materials that could not be processed due to reasons of thermal demagnetization or freezing can be processed without restriction, and equipment cleaning (for example, CIP cleaning or SIP sterilization) and maintenance work can be easily performed. It can be carried out.

  In addition, by allowing the heat medium for cooling to flow from the hollow portion formed inside the magnetic element to the gap between the magnetic element and the tubular body, the magnetic element is efficiently cooled from the inside, and the tubular body It is possible to reduce the influence of heat exerted by the heat medium for cooling on the raw material flowing around the outer periphery of the material.

  In addition, the heat medium for heating is circulated from the gap between the magnetic element and the tube to the hollow portion formed inside the magnetic element, so that the tube can be efficiently heated and the magnetic element can be heated. It is possible to reduce the influence of heat given by the heating medium for heating.

It is explanatory drawing which shows the basic structure of a fine iron powder removal apparatus. It is explanatory drawing which shows the usage method of a fine iron powder removal apparatus. It is front sectional drawing which shows one Example of the fine iron powder removal apparatus of this invention. It is explanatory drawing which shows the basic structure of a fine iron powder removal apparatus.

  Hereinafter, embodiments of the fine iron powder removing device of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the fine iron powder removing device of the present invention.
In this fine iron powder removing device, similarly to the conventional fine iron powder removing device, a magnetic element 5 composed of a permanent magnet 5a and a yoke 5b is provided in a conduit 1d through which a raw material having fluidity flows. A main body 1 having a pipe body 3 to be housed is arranged, and fine iron powder mixed in a raw material flowing in the pipe line 1d is adsorbed to the surface of the pipe body 3 in which the magnetic element 5 is housed. Are to be removed.

In this case, the connection shape of the inlet 1a and outlet 1b of the fine iron powder removing device and the pipe 1d through which the raw material flows can be easily attached / detached by the ferrule joint 11 in consideration of workability during maintenance and the like. It has a possible structure.
Similarly, the connection shape between the main body 1 and the magnet body 2 of the fine iron powder removing device has a structure that can be easily attached and detached by the ferrule joint 11 in consideration of workability during maintenance and the like. .

  In addition, the magnet body 2 including the tube body 3 and the magnetic element 5 is arranged in a zigzag manner when the magnet body 2 is mounted on the main body 1. The tubular body 3 configured as described above, the tubular body 4 that communicates with each tubular body 3 and holds each tubular body 3 via the partition wall 4a, and has approximately the same length as the tubular body 3, and the tubular body 3 and the tubular body 4, the magnetic element 5 that slides between the inside, the connecting plate 8 that fixes the end of each magnetic element 5, and the magnetic element 5 are placed inside the tube body 3 (when removing fine iron powder thereby. , The magnetic force of the magnetic element 5 can act on the surface of the tubular body 3) and in the cylindrical body 4 (with this, when performing maintenance work, the magnetic element 5 is disposed on the surface of the tubular body 3. Magnetic force can be prevented from acting. So that consist fixed gripping portion 7 for forming the end of the rod 9 to the connecting plate 8.

The magnetic element 5 that removes the fine iron powder mixed in the raw material is, for example, a permanent magnet 5a made of a rare earth neodymium magnet is brought into close contact with the same pole surface via a yoke 5b, and magnetic lines of force are efficiently transferred to the outside by a repulsive magnetic field. The structure is designed to release.
In this case, the permanent magnet 5a and the yoke 5b are integrated by tightening with a hollow bolt 5c.

The diameter of the magnetic element 5 integrated in this way is slightly larger than that of the permanent magnet 5a and the yoke 5b (although it is not particularly limited, the diameter is about 0.1 to 0.5 mm, More preferably, a guide 5d made of a synthetic resin or rubber having flexibility, for example, a fluororesin, is incorporated, and the magnetic element 5 is used during maintenance work. The frictional force when sliding in the tube body 3 is reduced so that the work can be easily performed.
Here, when a heat medium described later is circulated, a groove (not shown) for distributing a heat medium described later is formed in the axial direction of the magnetic element 5 on the peripheral surface of the guide 5d.

  A plurality of (for example, seven) magnetic elements 5 are fixed to the connecting plate 8 via flexible joints 10. The flexible joints 10 are each of the tubular elements 3 when the magnetic elements 5 perform maintenance work. When sliding inside, it is attached for the purpose of maintaining smooth sliding by absorbing dimensional errors due to processing accuracy of equipment, distortion due to welding, or thermal distortion of tube 3 due to the temperature of raw materials to be processed. Yes.

  In this embodiment, the flexible joint 10 has a flexible synthetic resin or rubber cylindrical member (the reason why the cylindrical member is used here is to circulate a heat medium described later. However, when it is not necessary to form a flow path in the flexible joint 10 by circulating the heat medium through another path, a solid member can be used.) The joint 10 is not limited to this as long as it has a function of absorbing dimensional errors between the tube body 3 and the magnetic element 5 and maintaining smooth sliding, and has a function of absorbing eccentricity and declination, for example. A floating joint which is a mechanical part can be used, or both can be used together.

  The connecting plate 8 has a double structure in which a spacer 8c is inserted. The upper connecting plate 8A has a hollow rod 9 and the lower connecting plate 8B has a plurality of magnetic elements 5 via a flexible joint 10. It is fixed.

The rod 9 is made of a hollow pipe material, and is supported by the slide bearing 6b of the lid body 6 at the top of the magnet body 2 so as to be able to move up and down.
As shown in FIG. 2, this movement causes the fine iron powder mixed in the raw material to be adsorbed and captured on the outer surface of the tube 3 containing the magnetic element 5, but the captured fine iron powder is saturated. In this case, it is necessary to remove the magnetic element 5 housed in the tube 3 to the upper part of the magnet body 2 by the rod 9 and housed in the tube 3. To easily and completely remove the captured fine iron powder by separating the magnetic element 5 to a distance that does not affect the magnetic force of the fine iron powder captured on the outer surface of the tube 3. Is.

  By the way, with respect to the fine iron powder removing device having such a structure, the raw material to be processed is at a high temperature, and the permanent magnet 5a constituting the magnetic element 5 has a heat demagnetization reversible range of the permanent magnet 5a. When there is a risk of applying a heat load as described above (in the case of a neodymium magnet, 70 to 80 ° C. or more), the permanent magnet 5a is thermally reduced by supplying a heat medium for cooling from the supply port 9a at the tip of the rod 9. Protect from magnetism.

By the way, in the present embodiment, the heat medium for cooling is supplied from the supply port 9a to the rod 9, the gap between the upper connecting plate 8A and the lower connecting plate 8B, and the hollow portion formed in the magnetic element 5 (hollow Shaped bolt 5 c), the gap between the magnetic element 5 and the tube 3, the magnet body 2, and the discharge port 6 a provided in the lid body 6 in this order.
As a result, the magnetic element 5 can be efficiently cooled from the inside thereof, and the influence of the heat exerted by the heat medium for cooling on the raw material flowing on the outer peripheral portion of the tube 3 can be reduced.

Here, when a gas is used as the heat medium for cooling, the supply air is pressurized air that has been cooled by an ejector, a vortex tube, or the like that applies the adiabatic expansion phenomenon caused by compressed air. However, it is also possible to use a heat medium for cooling obtained by other known mechanisms.
Since the gap between the magnetic element 5 and the tube 3 serving as the flow path for the heat medium is narrow and the cross-sectional area of the flow path is small, the pressure loss is large, so that a supply pressure that overcomes this is required.
That is, in order to efficiently remove the fine iron powder actually mixed in the raw material, it is necessary to increase the magnetic line density of the outer surface of the tubular body 3 containing the magnetic element 5 as much as possible. Since it attenuates in inverse proportion to the square of the distance from the permanent magnet 5a and the yoke 5b, the size of the gap between the magnetic element 5 and the tube 3 and the pipe thickness of the tube 3 must be made as small as possible. Therefore, the gap becomes narrow, and a supply pressure is necessary to compensate for this pressure loss.
And in order to perform efficient heat exchange, it is desirable that the flow rate of a heat medium and the temperature difference with the raw material to process are large.

  Hereinafter, by supplying high-pressure air obtained by an air compressor to a cylinder having a plurality of bores called a vortex tube, a swirl flow is generated inside the cylinder, and high-temperature and high-pressure is generated by the centrifugal force. A free swirling flow in the cylindrical body wall region and a flow path as a smaller forced swirling flow are formed inside the free swirling flow, and these two swirling flows have a large pressure difference and a temperature difference. A demonstration example using the forced swirl flow inside will be described.

In this demonstrative example, a type of equipment in which supply air amount × air pressure was 270 NL / min × 0.5 Pa and discharge air amount × discharge temperature was 135 NL / min × −40 ° C. was used.
The required power converted into the air compressor at this time is 2.2 Kw.
Low-temperature air obtained by this device is supplied from the supply port 9a to the rod 9, the gap between the upper connecting plate 8A and the lower connecting plate 8B, the hollow portion (hollow bolt 5c) formed inside the magnetic element 5, The gap between the magnetic element 5 and the tube 3, the magnet body 2, and the discharge port 6 a provided in the lid body 6 are circulated in this order, and discharged from the discharge port 6 a to the outside.

With such an equipment configuration, boiling water was supplied at a rate of 20 L / min, and the thermal demagnetization of the permanent magnet 5a made of a neodymium magnet constituting the magnetic element 5 was measured with a gauss meter for measuring magnetic force.
In this demonstration example, the operation time of the apparatus was set to 30 minutes, and the operation was performed a plurality of times while changing the amount of low-temperature air supplied to the heat medium.
As a result, thermal demagnetization of the permanent magnet 5a was not recognized even when the amount of air supplied to the low-temperature air generator was 180 NL / min and the air pressure was 0.3 Mpa.

The flow path of the heat medium is not particularly limited as long as the heat medium flows through the gap between the magnetic element 5 and the tubular body 3 and the hollow portion formed inside the magnetic element 5. And a pipe for supplying a heat medium (a hose having flexibility) can be connected.
In addition, the flow path of the heat medium can be reversed by inverting the supply port 9a and the discharge port 6a.
Furthermore, the heat medium is not limited to a gas such as low-temperature (or high-temperature) air, and may be a liquid such as water or oil having a large specific heat and a rust prevention effect.

On the other hand, when the temperature of the raw material to be processed is below freezing point, such as ice cream, soft cream, ice confectionery such as sherbet, etc., about several tens of minutes to several hours from the start of the operation of removing fine iron powder, Although the fine iron powder removing device operates normally, the raw material to be processed is frozen around the pipe body 3 in which the magnetic element 5 of the fine iron powder removing device is accommodated when the operating time is reached. However, in order to cope with this problem, the heating medium for heating was used as the circulation of the heating medium for cooling. It is made to supply so that it may distribute | circulate to the hollow part formed in the inside of the magnetic element 5 from the reverse direction, ie, the clearance gap between the magnetic element 5 and the pipe body 3. FIG.
Thereby, the tube body 3 is efficiently heated, and the tube body 3 is kept above the freezing start temperature, thereby preventing adhesion of raw materials to the tube body 3 and continuous for a long time without causing a clogging phenomenon. The raw material can be processed, and the influence of heat applied to the magnetic element 5 by the heat medium for heating can be reduced.

Here, as the heat exchanger for the heat medium, for example, a heat exchanger that obtains heated air by supplying compressed air to an in-line type heater unit that incorporates a sheathed heater or a ceramic heater in a stainless steel pipe is used. be able to.
Note that the temperature of the heated air to be supplied is limited to the heat demagnetization reversible range of the permanent magnet 5a used.

  As mentioned above, although the fine iron powder removal apparatus of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, For example, the magnetic element 5 demonstrated in the Example In addition to the fine iron powder removing device that can be selectively positioned in either the tube body 3 or the cylindrical body 4, the fine iron powder removing device in which the cylindrical body is omitted as shown in FIG. The configuration can be changed as appropriate without departing from the spirit of the invention.

The fine iron powder removing device of the present invention has the property that it can process raw materials at high temperature and low temperature without restriction, and can easily perform cleaning and maintenance work of equipment. In addition to being suitably used for applications using low-temperature raw materials, for example, it can be widely used for facilities for performing CIP cleaning and SIP sterilization.
Moreover, the object of raw materials can also be used for the processing of raw materials other than foods, such as steam turbine bearing lubricating oil, machining cutting lubricating oil, and the like that could not be handled by temperature limitation so far.

DESCRIPTION OF SYMBOLS 1 Main body 1a Inlet 1b Outlet 1c Opening 1d Pipe line 2 Magnet body 3 Tubing body 4 Tubular body 5 Magnetic element 5a Permanent magnet (neodymium permanent magnet)
5b Yoke 5c Bolt 5d Guide 6 Lid 6a Discharge port 6b Slide bearing 7 Holding part 8 Connecting plate 9 Rod 9a Supply port 10 Flexible joint 11 Ferrule joint 12 Ferrule joint

Claims (3)

  In a fine iron powder removing apparatus that includes a magnetic element and a tubular body in which the magnetic element is accommodated and removes fine iron powder mixed in a raw material that flows around the outer periphery of the tubular body, the magnetic element and the tubular body An apparatus for removing fine iron powder, characterized in that the gap and the hollow part formed inside the magnetic element serve as a flow path for the heat medium.   2. The fine iron powder removing device according to claim 1, wherein a heat medium for cooling is circulated from a hollow portion formed inside the magnetic element to a gap between the magnetic element and the tubular body.   2. The fine iron powder removing apparatus according to claim 1, wherein a heating medium for heating is circulated from a gap between the magnetic element and the tubular body to a hollow portion formed inside the magnetic element.

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