JP2008029086A - Varnish impregnation method and device therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a varnish impregnation method and a device therewith capable of equally impregnating even inside a coil with varnish and of preventing varnish from being made to adhere to portions except the coil portion. <P>SOLUTION: This varnish impregnation device includes: a method for impregnating the coil with an appropriate impregnation amount of varnish by mixing vanish with air for atomization and injecting the vanish through spray nozzles; a method in which the spraying amount per hour and the sprayed regions of varnish by the spray nozzles 1 are set according to vanish fluid pressure, air pressure and a nozzle diameter, and the proper impregnation amount of varnish is based on the weight of a work; a device for mixing varnish with air for atomization and for relatively rotating the spray nozzles 1 to the work by allocating a lot of spray nozzles 1, of which sprayed regions and the spraying amount per hour onto the coil are limited, on the right and left outer circumferential surfaces, right and left inner circumferential surfaces and front and rear side surfaces of the coil; and a work attachment mechanism 5 for rotating the work predetermined times according to the proper impregnation amount of varnish based on the weight of the work, in which the sprayed regions and the spraying amount per hour onto the coil by the spray nozzles are limited based on the varnish fluid pressure, air pressure and the nozzle diameter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a varnish impregnation method and apparatus for impregnating a motor stator core wound around a core by impregnating the varnish with the varnish.

  Conventionally, as a method of impregnating a motor stator core with varnish, there is a method in which low-pressure air is blown onto a coil portion after dripping the varnish (see, for example, Patent Document 1). Also, there is a technique for determining the adhering varnish weight by measuring the weight of the falling varnish that does not adhere to the winding coil but falls down based on the weight of the dripped varnish (for example, Patent Document 2). reference). Furthermore, there is one that performs air blow on the varnish to be dropped (see, for example, Patent Document 3).

However, the method of Patent Document 1 has a problem that it is difficult to uniformly impregnate the varnish because the dropped varnish is impregnated with the pressure of low-pressure air. Further, the method of Patent Document 2 has a problem that the amount of varnish reduction and the amount of fall varnish must be monitored, and the apparatus becomes complicated and expensive. Furthermore, since the method of Patent Document 3 blows air onto the varnish in the middle of dropping, there is a problem that it is difficult to control the timing of blowing the air and it is difficult to adjust the spraying position of the varnish and also to adjust the spraying strength.
Japanese Patent Laid-Open No. 7-213029 Japanese Patent Laid-Open No. 2001-2311225 JP 2005-318692 A

  An object of the present invention is to provide a method and an apparatus for impregnating a varnish in which the varnish can be uniformly permeated into the inside of the coil and the varnish does not adhere to any part other than the coil portion.

  The present invention mixes varnish and air to atomize the varnish and sprays the atomized varnish only on the coil area of the work by a spray nozzle that rotates relative to the work so that the varnish is properly impregnated inside the coil. A varnish impregnation method for infiltrating a quantity, and a spray nozzle in which the varnish and air are mixed to atomize the varnish and the spray amount and spray area per hour of the varnish are limited based on the varnish liquid pressure, air pressure and nozzle diameter A varnish impregnation method in which an appropriate amount of varnish is infiltrated into the coil by injecting the varnish atomized only in the coil area of the workpiece for a predetermined time by rotating relative to the workpiece and mixing the varnish and air A number of spray nozzles that atomize, have a limited spray area on the coil, and have a limited spray amount per hour to inject and penetrate a proper amount of varnish into the coil. The varnish impregnating device is arranged on the left and right outer peripheral surfaces, left and right inner peripheral surfaces and front and rear side surfaces of the work so that it can rotate relative to the work, and the varnish and air are mixed to atomize the varnish and varnish hydraulic pressure A large number of spray nozzles with a limited spray area on the coil based on the air pressure and nozzle diameter and with a limited spray amount per hour are arranged on the coil left and right outer peripheral surfaces, left and right inner peripheral surfaces, and front and rear side surfaces of the workpiece. A varnish impregnation apparatus provided with a workpiece mounting mechanism that rotates and rotates a workpiece a predetermined number of times according to an appropriate amount of varnish impregnation based on the workpiece weight.

  According to the first aspect of the present invention, the varnish and air are mixed to atomize the varnish and spray the atomized varnish only on the coil region of the work by the spray nozzle that rotates relative to the work. Since the varnish is impregnated with the proper amount of impregnation, the varnish is atomized and sprayed as fine particles, so that it penetrates into the coil through the gap between the coils, so that it can be made a strong coil and the varnish spray Since the range can be limited only to the coil region, it is not necessary to remove the varnish that has adhered and hardened to other parts, and the productivity can be improved. In addition, since the injection nozzle and the work are rotated relatively, there is no restriction that the work other than the work cannot be rotated as in the prior art, and the injection nozzle can be moved, so an optimum varnish impregnation method can be used according to various work shapes. Obtainable.

  According to a second aspect of the present invention, there is provided a spray nozzle in which the varnish and air are mixed to atomize the varnish and the spray amount and spray area per hour of the varnish are limited based on the varnish liquid pressure, the air pressure, and the nozzle diameter. And the atomized varnish is injected only into the coil area of the workpiece for a predetermined time so that the proper amount of impregnation of the varnish penetrates into the inside of the coil. Of course, it is possible to infiltrate the inside of the coil through the slit, and only the coil region can be impregnated with the varnish. Furthermore, since the injection nozzle and the workpiece are relatively rotated, the workpiece or the injection nozzle can be moved according to the workpiece shape, and the optimum varnish impregnation can be performed. Further, since the spray amount per hour is set for the spray nozzle, the amount of varnish impregnation can be known from the number of rotations of the workpiece or the spray nozzle, and the proper amount of varnish impregnation can be obtained without monitoring the varnish weight. Further, since the spray amount per hour and the spray range can be set based on the air pressure, the varnish liquid pressure, and the nozzle diameter, an optimal setting can be easily obtained according to the shape and size of the workpiece.

Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a spray nozzle that mixes varnish and air to atomize and spray the varnish. The spray nozzle 1 includes a two-fluid nozzle, and an air flow path 1b, a varnish flow path 1c, and a nozzle body 1a. The tip of the nozzle body 1a is covered with a nozzle cap 1d. The air flow path 1b is an inclined hole facing the central hole to be the varnish flow path 1c, and the nozzle hole diameter (varnish flow path) is φ0.4 to 1.0 mm.

  The spray nozzle 1 is an internal mixing type in which air and varnish are mixed in the nozzle cap 1d. Needless to say, the spray nozzle 1 may be an external mixing type in which air and varnish are mixed at the outlet of the nozzle cap 1d. Needless to say, the air channel 1b may be a central hole and the varnish channel 1c may be an inclined hole.

  Further, as shown in FIGS. 1 and 2, the spray nozzle 1 is disposed with its tip facing the left and right outer peripheral surfaces, the left and right side surfaces, and the left and right inner peripheral surfaces of the coil C wound around the stator core S of the workpiece. It is assumed that the varnish can only be sprayed on. The separation distance between the spray nozzle 1 and the coil C is defined based on the spray area of the varnish determined by the nozzle diameter, the varnish liquid pressure, the air pressure, etc., and the atomized varnish is sprayed on the stator core S of the workpiece. This is an area that never happens. Moreover, it is preferable that the atomization varnish injected from all the spray nozzles 1 shall be 12-13 g / min.

  Reference numeral 2 denotes a varnish supply circuit for supplying a varnish to the spray nozzle 1. The varnish supply circuit 2 includes a varnish tank 2a and a pressurizing mechanism 3 for applying a constant fluid pressure to the varnish. The varnish supply circuit 2 includes each spray nozzle. 1 is connected. The pressurizing mechanism 3 seals the varnish tank 2a and pressurizes it by supplying pressurized air to the varnish tank 2a. A fluid pressure of 5 MPa is given. Furthermore, the proper amount of varnish impregnated in the workpiece is about 30 to 100 g / unit according to the workpiece size. Moreover, the liquid pressure of the varnish is appropriately set depending on the nozzle diameter, the spray area, and the work size.

  4 is an air supply circuit for supplying air to the spray nozzle 1, and the air supply circuit 4 is connected between the air source and each spray nozzle 1, and an air pressure of 0.01 to 0.5 MPa is applied to the spray nozzle 1. To supply to. The air pressure is appropriately set according to the nozzle diameter, spray area, and workpiece size.

  Reference numeral 5 denotes a workpiece mounting mechanism. The workpiece mounting mechanism 5 includes an expanding chuck 5a and a rotating shaft 5b to which the expanding chuck 5a is attached. The rotating shaft 5b is connected to a drive source (not shown). The workpiece mounting mechanism 5 rotates the workpiece at a predetermined number of rotations of 10 to 50 rpm. The number of rotations of the workpiece is determined from the spray amount per hour of the spray nozzle 1, the proper amount of varnish impregnation, and the workpiece size.

Hereinafter, the operation of the present invention will be described based on the varnish impregnation drying apparatus shown in FIG.
The varnish impregnation drying apparatus includes a work detaching portion 10, a preheating chamber 11, a varnish impregnation chamber 12, a drying chamber 13, and a cooling chamber 14. Each chamber is partitioned by a partition and sealed by a cover 15. Further, the spray nozzle 1 provided in the varnish impregnation portion 12 can approach the work up to a predetermined separation distance when the work enters the varnish impregnation chamber 12.

  When performing varnish impregnation, first, a workpiece is mounted on the workpiece mounting mechanism 5 disposed at regular intervals on the step moving type conveyor 16. After the work is mounted on the work mounting mechanism 5, the conveyor 16 is driven and operated by one step so that the work enters the preheating chamber 11. At this time, the workpiece is rotated by the workpiece mounting mechanism 17 so as to be preheated evenly. Then, during the two-step operation of the conveyor 16 while being rotated by the workpiece mounting device 5, the workpiece preheated in the preheating chamber 11 enters the varnish impregnation chamber 12 by the third step operation of the conveyor 16.

  When the workpiece supported while being rotated at a constant speed by the workpiece mounting mechanism 5 is accommodated in the varnish impregnation chamber 12, the spray nozzle 1 moves to move the left and right outer circumferential surfaces, the left and right inner circumferential surfaces, and the left and right side surfaces of the coil C. Approach a predetermined position. When the positioning of the spray nozzle 1 is completed, the air supply circuit 4 and the varnish supply circuit 3 supply a predetermined pressure of air and a predetermined hydraulic pressure of the varnish to each spray nozzle 1.

  The air and varnish supplied to the air flow path 1b and the varnish flow path 1c of the spray nozzle 1 are mixed and atomized, and atomized on the left and right outer peripheral surfaces, the left and right inner peripheral surfaces, and the left and right side surfaces of the rotating coil C. The varnish which becomes is jetted. The varnish that has become fine particles by this injection pressure is forcibly permeated into the inside through the slits of the coil C.

  The workpiece is rotated while spraying so that the amount of varnish sprayed from all the spray nozzles 1 is, for example, about 12 g / min. If the proper amount of varnish impregnation is, for example, about 36 g, the proper amount of impregnation can be obtained by rotating the work for about 3 minutes. Therefore, the conveyor 16 is operated by one step to feed the work into the drying chamber 13 below the conveyor 16. The work stays in the drying chamber 13 for four steps of the conveyor 16 and is dried, and then sent to the cooling chamber 14. Then, after the cooling in the cooling chamber 14 is completed, the conveyor 16 is operated by one step and sent to the workpiece attaching / detaching unit 10, and the workpiece on which the varnish has been dried and cured may be removed from the workpiece mounting mechanism 5. Then, a new workpiece may be mounted on the workpiece mounting mechanism 5 and the same operation as described above may be repeated.

It is a front view which shows preferable embodiment of this invention. It is a side view similarly. It is sectional drawing which expands and shows a spray nozzle similarly. It is a front view which shows the varnish impregnation drying apparatus with which this invention was integrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Varnish supply circuit 3 Pressurization mechanism 4 Air supply circuit 5 Work attachment mechanism

Claims (4)

  Mixing varnish and air to atomize the varnish and spray the atomized varnish only on the coil area of the workpiece by a spray nozzle that rotates relative to the workpiece to allow the varnish to penetrate into the coil. A varnish impregnation method characterized by the above.   The varnish and air are mixed to atomize the varnish, and the spray nozzle in which the spray amount and spray area of the varnish are limited based on the varnish liquid pressure, air pressure and nozzle diameter is rotated relative to the workpiece. A varnish impregnation method characterized by spraying a varnish atomized only in a coil area of a workpiece for a predetermined time to infiltrate an appropriate amount of varnish impregnation into the inside of the coil.   The varnish and air are mixed to atomize the varnish, the spray area to the coil is limited, the spray amount per hour is limited, and a number of spray nozzles that inject and penetrate the proper amount of varnish into the coil A varnish impregnation apparatus characterized in that it is disposed on the left and right outer peripheral surfaces, the left and right inner peripheral surfaces, and the front and rear side surfaces of the workpiece so as to be relatively rotatable. The varnish and air are mixed to atomize the varnish, and the spray area to the coil is limited based on the varnish liquid pressure, air pressure and nozzle diameter, and a large number of spray nozzles with a limited spray amount per hour are used. A varnish impregnation apparatus characterized in that a work mounting mechanism is provided that is disposed toward the left and right outer peripheral surfaces of the coil, the left and right inner peripheral surfaces, and the front and rear side surfaces, and that rotates the work a predetermined number of times according to an appropriate amount of varnish impregnation based on the work weight.

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