JP7568567B2 - Varnish dripping device and varnish dripping method - Google Patents

Description

The present invention relates to a varnish dripping device and a varnish dripping method.

Conventionally, a varnish dripping device has been disclosed that drips varnish onto, for example, the coil end portion of a stator in which a stator coil is attached to a stator core (see, for example, Patent Document 1). In the varnish dripping device of Patent Document 1, varnish is dripped onto a workpiece from a dispenser nozzle, thereby coating and impregnating the workpiece with varnish.

Patent No. 6221574

However, in conventional technology, when the varnish is supplied to the dispenser, no consideration is given to removing air bubbles that may occur in the varnish due to disturbances, etc., so the varnish still contains air bubbles and air bubbles larger than the allowable range adhere to the workpiece. As a result, it is not possible to dispense high-quality varnish onto the workpiece with precision.

The present invention was made in consideration of the above problems, and aims to provide a varnish dripping device and a varnish dripping method that drips varnish after removing air bubbles that exceed the allowable range.

(1) The varnish dripping device according to the present invention (for example, the varnish dripping device 1 described later) includes a supply means (for example, the supply unit 10 described later) for supplying varnish (for example, the varnish V described later), and a dispenser (for example, the dispenser 20 described later) for dripping the varnish supplied from the supply means from a nozzle (for example, the nozzle 20a described later). The dispenser includes a chamber (for example, the chamber 41 described later) for temporarily storing the varnish supplied from the supply means, a filter (for example, the filter 42 described later) provided in the chamber and having a penetration portion (for example, the mesh 42a described later) smaller than a predetermined size, thereby being capable of removing at least a portion of the air bubbles contained in the varnish, and a flow path (for example, the small diameter penetration portion 43 described later) for guiding the varnish that has passed through the penetration portion of the filter from the chamber to the nozzle.

The varnish dripping device of (1) is equipped with a filter that has a penetration portion smaller than a predetermined size and is therefore capable of removing at least a portion of the air bubbles contained in the varnish, and the varnish that passes through the penetration portion of the filter is guided to the nozzle of the dispenser, so that air bubbles larger than the allowable range can be removed before the varnish is dripped. This allows for high-quality varnish to be dripped, and ultimately improves the efficiency of the work of dripping the varnish.

(2) The varnish dripping device of (1) may be provided with a bubble exhaust means (e.g., bubble exhaust section 44 described later) that is openably and closably provided at a position upstream of the filter in the chamber, closes when the varnish is dripped, and exhausts air bubbles (e.g., air bubble B described later) remaining in the chamber when it is open.

According to the varnish dripping device of (2), by opening the air bubble exhaust means, air bubbles that cannot pass through the filter and remain in the chamber can be exhausted, and poor dripping of varnish caused by air bubbles remaining in the chamber can be prevented.

(3) In the varnish dripping device of (1) or (2), it is preferable that the filter is made of a metal that is insoluble in the varnish.

(3) With the varnish dripping device, the filter is made of a metal that is insoluble in varnish, so the filter's function can be prevented from being impaired over time.

(4) The present invention also provides a method for dripping varnish using any one of the varnish dripping devices (1) to (3).

According to the varnish dripping method of (4), a filter is provided that has a penetration portion smaller than a predetermined size and is therefore capable of removing at least a portion of the air bubbles contained in the varnish, and the varnish that passes through the penetration portion of the filter is guided to the nozzle of the dispenser, so that air bubbles larger than the allowable range can be removed before the varnish is dripped. This allows for high-quality varnish to be dripped, and ultimately improves the efficiency of the work of dripping the varnish.

According to the present invention, it is possible to dispense varnish after removing bubbles larger than the allowable range, and it is possible to dispense high-quality varnish. This in turn improves the efficiency of the work of dispensing varnish.

1 is a schematic diagram of a varnish dropping device according to an embodiment of the present invention. FIG. 2 is a diagram showing the periphery of an adapter in the varnish dropping device. FIG. 11 is a diagram comparing air bubbles larger than the allowable range with the size of the mesh of a filter.

The following describes in detail an embodiment of the present invention with reference to the drawings.

First, the configuration of the varnish dripping device 1 according to an embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram of the varnish dripping device 1 according to an embodiment of the present invention. Figure 2 is a diagram showing the periphery of the adapter 40 in the varnish dripping device 1.

The varnish dripping device 1 according to this embodiment drips varnish V onto a workpiece, thereby applying varnish V to the workpiece. The workpiece is not particularly limited, but an example of the workpiece is a stator having a stator coil attached to a stator core, and the varnish V is dripped onto the coil end portion of the stator.

As shown in Figures 1 to 3, the varnish dripping device 1 is a device that drips varnish V onto a workpiece or the like (not shown). Specifically, the varnish dripping device 1 includes a supply unit 10 and a dispenser 20.

The supply unit 10 supplies varnish V to the dispenser 20 by the pressure of air supplied from a compressor (not shown). Specifically, the supply unit 10 has a tank 11, a pressure gauge 12, a tube 13, a strainer 14, a fitting 15, and a pressure sensor 16.

The tank 11 contains the varnish V. The tank 11 receives air from a compressor (not shown) and supplies the varnish V to the dispenser 20 via the tube 13. The pressure gauge 12 measures the pressure inside the tank 11 and displays the measurement result. The tube 13 is a pipe that guides the varnish V contained in the tank 11 to the dispenser 20.

The strainer 14 is provided midway through the tube 13 and removes foreign matter that gets mixed into the varnish V flowing through the tube 13. The fitting 15 connects the tube 13 to the dispenser 20. The pressure sensor 16 detects the pressure inside the fitting 15 and outputs the detection result as a signal.

The dispenser 20 drips the varnish V supplied from the supply unit 10 from the nozzle 20a. Specifically, the dispenser 20 has a dispenser body 30 and an adapter 40.

The dispenser body 30 is the power part of the dispenser 20. Specifically, the dispenser body 30 has a housing 31, a screw 32, a motor 33, and a reducer 34.

The housing 31 houses the screw 32 and receives the varnish V supplied from the supply unit 10. The screw 32 rotates to send the varnish V received by the housing 31 from the supply unit 10 to the adapter 40. The motor 33 rotates the screw 32 by being driven based on the detection results of the pressure sensors 16 and 45, etc. The reducer 34 reduces the rotational speed of the motor 33 and outputs it to the screw 32.

The adapter 40 is a characteristic part of the varnish dripping device 1, and is attached to the dispenser body 30 when in use. Specifically, the adapter 40 has a chamber 41, a filter 42, a small diameter through-hole 43, an air bubble discharge part 44, a pressure sensor 45, etc.

The chamber 41 temporarily stores the varnish V supplied from the supply unit 10 and delivered from the dispenser body 30. The chamber 41 includes a large diameter portion 41a having a cylindrical shape with a larger diameter than a small diameter penetrating portion 43 described below, and a cylindrical expanding diameter portion 41b expanding in diameter from the small diameter penetrating portion 43 described below toward the large diameter portion .

The filter 42 is provided in the chamber 41. More specifically, the filter 42 is disposed at the boundary between the large diameter portion 41a and the expanded diameter portion 41b that constitute the chamber 41. The filter 42 has mesh 42a as a penetration portion smaller than a predetermined size, and is therefore capable of removing at least a portion of the air bubbles contained in the varnish V. Note that, although a mesh-shaped filter 42 is used in this embodiment, this is not limited thereto, and it is also possible to use, for example, a porous filter.

The size of the penetration part of the filter 42 is large enough to remove at least a portion of the air bubbles contained in the varnish V. Specifically, the penetration part has a diameter (e.g., average diameter) smaller than 0.2 mm, or each side has a length smaller than 0.2 mm. Experiments have shown that if varnish V containing air bubbles of 0.2 mm or more is dripped onto a workpiece, it will result in a defective product. By making the size of the penetration part of the filter 42 smaller than 0.2 mm, it is possible to remove air bubbles of 0.2 mm or more that would cause defective products, and it is possible to eliminate the cause of the defective product.

Here, FIG. 3 is a diagram comparing air bubbles B that exceed the allowable range in size with the size of the mesh 42a of the filter 42. As described above, the size of air bubbles that exceed the allowable range is 0.2 mm or more. As shown in FIG. 3, the size of the mesh 42a of the filter 42 (the length of each side of the rectangle) is smaller than 0.2 mm, so air bubbles with a diameter of 0.2 mm or more that exceeds the allowable range cannot pass through the mesh 42a of the filter 42 and remain in the chamber 41.

In particular, since the varnish dripping device has many connections such as tanks, tubes, and fittings in constructing the system, there is a risk of air entering through these connections. In addition, due to the suck-back that is usually performed to prevent varnish from dripping from the dispenser, there is a high possibility that air will be mixed in when the varnish is drawn in. In contrast, the varnish dripping device 1 according to this embodiment is equipped with the above-mentioned filter 42, making it possible to effectively remove air bubbles contained in the varnish V.

The filter 42 is preferably made of a metal that is insoluble in varnish. For example, it is preferably made of metal such as SUS or aluminum. By using a filter made of such insoluble metal, deterioration of the filter over time is suppressed.

The small diameter through-hole 43 is a flow path that guides the varnish V that has passed through the filter 42 from the chamber 41 to the nozzle 20a of the dispenser 20.

The air bubble discharge section 44 is provided in a position upstream of the filter 42 in the chamber 41 so as to be openable and closable, and is closed by the bolt 44a when the varnish V is dripped, and when open, the varnish V is sprayed from the supply section 10 to discharge any air bubbles remaining in the chamber 41. The pressure sensor 45 detects the pressure in the chamber 41 and outputs the detection result as a signal.

By using the varnish dripping device 1 according to this embodiment having the above configuration, it is possible to carry out the varnish dripping method of the present invention. That is, by using the varnish dripping device 1 according to this embodiment, the varnish V supplied from the supply unit 10 is passed through the mesh 42a of the filter 42, and then dripped from the nozzle 20a of the dispenser 20, so that the varnish can be applied to the workpiece.

This embodiment provides the following advantages:

The varnish dripping device 1 according to this embodiment is provided with a filter 42 having a mesh 42a as a penetration portion that can remove at least a portion of the air bubbles contained in the varnish by having a penetration portion smaller than a predetermined size, and the varnish V that passes through the mesh 42a of the filter 42 is guided to the nozzle 20a of the dispenser 20, so that air bubbles larger than the allowable range can be eliminated before the varnish V is dripped. This allows high-quality varnish V to be dripped, and ultimately improves the efficiency of the work of dripping the varnish V.

In addition, according to the varnish dripping device 1 of this embodiment, by opening the air bubble discharge section 44, it is possible to discharge the air bubbles B remaining in the chamber 41, and it is possible to prevent poor dripping of the varnish V caused by the air bubbles B remaining in the chamber 41.

In addition, according to the varnish dripping device 1 of this embodiment, the filter 42 is made of a metal that is insoluble in the varnish V, so it is possible to prevent the function of the filter 42 from being impaired due to deterioration over time.

Furthermore, according to the varnish dripping method in which varnish is dripped using the varnish dripping device 1 of this embodiment, it is possible to similarly eliminate air bubbles larger than the allowable range before dripping the varnish V. This allows for high-quality varnish V to be dripped, and ultimately improves the efficiency of the work of dripping the varnish V.

The present invention is not limited to the above-mentioned embodiments, and includes modifications and improvements within the scope of the present invention that achieves the object of the present invention.

1 Varnish dripping device 10 Supply section (supply means)
REFERENCE SIGNS LIST 11 Tank 12 Pressure gauge 13 Tube 14 Strainer 15 Joint 16 Pressure sensor 20 Dispenser 20a Nozzle 30 Dispenser body 31 Housing 32 Screw 33 Motor 34 Speed reducer 40 Adapter 41 Chamber 42 Filter 42a Mesh (through-hole)
43 Small diameter penetration part (flow passage)
44 Air bubble discharge section (air bubble discharge means)
44a Bolt 45 Pressure sensor V Varnish B Air bubble

Claims (4)

a supply means for supplying varnish;
a dispenser that drips the varnish supplied from the supply means through a nozzle,
The dispenser includes:
a chamber for temporarily storing the varnish supplied from the supply means;
a filter provided in the chamber and having a through-hole smaller than a predetermined size, thereby being capable of removing at least a portion of air bubbles contained in the varnish;
a flow path that guides the varnish that has passed through the through-hole of the filter from the chamber to the nozzle,
The chamber is composed of a large diameter portion and an expanding diameter portion that expands in diameter from the flow path toward the large diameter portion,
The varnish dropping device , wherein the filter is a flat filter arranged at the boundary between the large diameter portion and the expanded diameter portion . The varnish dripping device according to claim 1, which is provided with an air bubble exhaust means that is openably and closably provided at a position upstream of the filter in the chamber, closes when the varnish is dripped, and exhausts air bubbles remaining in the chamber when the chamber is opened. The varnish dripping device according to claim 1 or 2, wherein the filter is made of a metal that is insoluble in varnish. A method for dripping varnish, comprising dripping varnish using a varnish dripping device according to any one of claims 1 to 3.

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