JP7737282B2 - Discharge devices and electrical equipment - Google Patents

Description

The present invention relates to a discharge device and an electrical device.

In recent years, electrical appliances such as air purifiers, air conditioners, fans, refrigerators, and vacuum cleaners have begun to be equipped with discharge devices that generate ions, electrons, radicals, ozone, and active species.

Patent Document 1 discloses a discharge device that includes a housing, a discharge electrode whose tip protrudes outside the housing, and an electrode protection part for protecting the tip of the discharge electrode. The electrode protection part prevents the discharge electrode from coming into contact with the workbench if the discharge device tips over when being attached to an air purifier or the like, and also prevents the discharge electrode from coming into contact with surrounding objects or the worker's fingers during work.

International Publication No. 2018/055783

Patent Document 1 does not anticipate that, after the discharge device is attached to an air purifier or similar device during manufacturing, the end user will replace it with a new one or clean the discharge device. During manufacturing, it is possible to have a worker attach the discharge device according to a predetermined procedure to prevent damage to the discharge electrode. However, it is difficult to get end users to follow the predetermined procedure. Therefore, if it is anticipated that end users will touch the discharge device, a structure is needed to protect the discharge electrode so that it is not damaged by contact with fingers or the like. However, Patent Document 1 does not anticipate a structure that can protect the discharge electrode while the end user is working.

The present invention aims to provide a discharge device and electrical equipment that protects the discharge electrode by preventing the intrusion of objects from a specific direction.

The discharge device according to the present invention comprises a housing having an opening on one side, a discharge electrode protruding from the opening, and a pair of electrode protectors facing each other across the discharge electrode, the distance between which is different on one end and the other end.

The electrical equipment of the present invention includes a discharge device and a blower that blows air into an air path that includes a space in which the discharge electrode of the discharge device is located.

The present invention provides a discharge device and electrical equipment that protects the discharge electrode by preventing objects from entering from a specific direction.

1 is a perspective view of a discharge device according to a first embodiment. FIG. 2 is a plan view of the discharge device according to the first embodiment. FIG. 2 is a side view of the discharge device according to the first embodiment. FIG. 2 is a plan view showing a pair of electrode protection parts in the first embodiment. FIG. 10 is a plan view of a discharge device according to a second embodiment. FIG. 10 is a plan view of a discharge device according to a third embodiment. FIG. 10 is a vertical cross-sectional view of an air purifier according to a fourth embodiment.

Embodiments of the present invention will be described with reference to the drawings. Note that the same or equivalent parts in the drawings will be designated by the same reference symbols and will not be described repeatedly.

<Embodiment 1>
A discharge device 1 according to a first embodiment will be described with reference to Figures 1 to 3. Figure 1 is a perspective view of the discharge device 1, Figure 2 is a plan view thereof, and Figure 3 is a side view thereof. Figure 4 is a plan view showing a pair of electrode protection parts 40a, 50a according to the first embodiment.

Discharge device 1 includes a housing 11, discharge electrodes 30a and 30b, and electrode protectors 40a, 40b, 50a, and 50b. Discharge device 1 is, for example, an ion generating device in which discharge electrode 30a generates positive ions and discharge electrode 30b generates negative ions.

The housing 11 is generally flat and box-shaped, and has a bottom and four side surfaces 13-16 surrounding the bottom. The surface opposite the bottom forms an opening 12. The housing 11 is formed, for example, from insulating resin. The interior of the housing 11 is filled with insulating resin, and a step-up transformer, dielectric electrode, circuit board, etc. (hereinafter referred to as "board, etc.") (not shown) are arranged inside the housing 11. The insulating resin filled inside the housing 11 seals the opening 12. The insulating resin filled inside the housing 11 and sealing the opening 12 is referred to as the sealing portion 20.

Discharge electrodes 30a and 30b are electrically connected to the aforementioned substrate (not shown). The arrangement direction D1 of discharge electrodes 30a and 30b is indicated by an arrow in Figure 1, etc. The tips of discharge electrodes 30a and 30b protrude from the surface of sealing portion 20 that seals opening 12. The protruding direction D3 of discharge electrodes 30a and 30b is indicated by an arrow in Figure 1, etc.

The discharge electrodes 30a, 30b are formed from a conductive material such as metal, carbon fiber, conductive fiber, or conductive resin. In embodiment 1, the discharge electrodes 30a, 30b are brush-shaped discharge electrodes formed by bundling multiple linear conductors into a brush shape. The shape of the discharge electrodes 30a, 30b is not limited to a brush shape, and may be any shape, such as rod-shaped, needle-shaped, linear, fibrous, or planar.

A connector portion 21 is provided near the bottom surface of the side surface 14. A terminal 22 is disposed on the connector portion 21. One end of the terminal 22 is electrically connected to the aforementioned circuit board or the like (not shown). The other end of the terminal 22 is electrically connected to an external power supply. The voltage from the external power supply is boosted by the circuit board or the like (not shown) and applied to the discharge electrodes 30a and 30b. When the voltage is applied, the discharge electrode 30a generates positive ions, and the discharge electrode 30b generates negative ions. The external power supply is, for example, a power supply supplied to the discharge device 1 by an electrical appliance. The electrical appliance is, for example, the air purifier 100 shown in FIG. 7, which will be described later.

The tips of the discharge electrodes 30a and 30b protrude beyond the sealing portion 20 of the housing 11. Therefore, if the discharge device 1 falls over on a workbench or other surface during the manufacturing process before being attached to the electrical equipment, the discharge electrodes 30a and 30b may come into contact with the workbench or other surface, resulting in deformation or damage. Furthermore, the discharge electrodes 30a and 30b may come into contact with nearby objects or with the fingers of an operator during installation, resulting in deformation or damage. Furthermore, when an end user replaces the discharge device 1 attached to the electrical equipment with a new one, or when removing and cleaning the discharge device 1 attached to the electrical equipment, the discharge electrodes 30a and 30b may come into contact with nearby objects or with the end user's fingers, resulting in deformation or damage. Because end users are less familiar with handling the discharge device 1 than operators, it is necessary to more reliably protect the discharge electrodes 30a and 30b.

In embodiment 1, therefore, the discharge device 1 is provided with a pair of electrode protection parts 40a, 50a for protecting the discharge electrode 30a, and a pair of electrode protection parts 40b, 50b for protecting the discharge electrode 30b.

The pair of electrode protection units 40a, 50a are arranged line-symmetrically with a gap between them in the short direction of the housing 11 (i.e., the air flow direction D2 described below), sandwiching the discharge electrode 30a. Similarly, the pair of electrode protection units 40b, 50b are arranged opposite each other with a gap between them in the short direction of the housing 11, sandwiching the discharge electrode 30b. Furthermore, the electrode protection units 40a and 40b are arranged line-symmetrically with a gap between them in the longitudinal direction of the housing 11 (i.e., the arrangement direction D1). Similarly, the electrode protection units 50a and 50b are arranged line-symmetrically with a gap between them in the longitudinal direction of the housing 11.

The electrode protection part 40a has pillars 41a, 42a, and a protection piece 43a. Pillar 41a is provided on side 13, one of the four side surfaces 13 to 16 that make up the housing 11. Pillar 42a is provided on side surface 15, which is different from side surface 13. Side surface 13 is the side surface in the short direction (i.e., the air flow direction D2 described below), and side surface 15 is the side surface in the long direction (i.e., the arrangement direction D1), with side surfaces 13 and 15 intersecting at right angles. Furthermore, the thickness T41a of pillar 41a is thicker than the thickness T13 of side surface 13. Similarly, the thickness T42a of pillar 42a is thicker than the thickness T15 of side surface 15.

The protective piece 43a is supported by the column portions 41a and 42a. The protective piece 43a is supported at a position higher than the discharge electrode 30a in the protruding direction D3. The protective piece 43a is U-shaped when viewed from the protruding direction D3. The two ends of the U correspond to the outer protruding portion 44a and the inner protruding portion 45a. In the arrangement direction D1, the outer protruding portion 44a is positioned on the outside, close to the side surface 13, and the inner protruding portion 45a is positioned on the inside, far from the side surface 13.

The electrode protection part 50a has pillar parts 51a and 52a, and a protection piece 53a. The pillar part 51a is provided on the side surface 13. The pillar part 52a is provided on the side surface 16, which is perpendicular to the side surface 13. Furthermore, the thickness T51a of the pillar part 51a is thicker than the thickness T13 of the side surface 13, and the thickness T52a of the pillar part 52a is thicker than the thickness T16 of the side surface 16.

The protective piece 53a is supported by the column portions 51a and 52a. The protective piece 53a is supported at a position higher than the discharge electrode 30a in the protruding direction D3. The protective piece 53a is U-shaped when viewed from the protruding direction D3. The two ends of the U correspond to the outer protruding portion 54a and the inner protruding portion 55a. In the arrangement direction D1, the outer protruding portion 54a is positioned on the outside, close to the side surface 13, and the inner protruding portion 55a is positioned on the inside, far from the side surface 13.

In electrode protector 40a, the opening surrounded by side surfaces 13 and 15, pillars 41a and 42a, and protective piece 43a is an opening for air to pass through. Similarly, in electrode protector 50a, the opening surrounded by side surfaces 13 and 16, pillars 51a and 52a, and protective piece 53a is also an opening for air to pass through. These openings are intended to prevent electrode protectors 40a and 50a from acting as walls and obstructing the flow of air when discharge device 1 is installed in electrical equipment. The presence of these openings allows positive ions generated by the discharge of discharge electrode 30a to be carried by the air flow. Air flow direction D2 is indicated by an arrow in Figure 1, etc.

Furthermore, the presence of structures around the discharge electrode 30a could have an adverse effect on the discharge performance of the discharge electrode 30a. By dividing the member protecting the discharge electrode 30a into electrode protection portion 40a and electrode protection portion 50a rather than having a structure that surrounds the discharge electrode 30a in one piece, the adverse effect that electrode protection portions 40a and 50a have on the discharge performance of the discharge electrode 30a can be reduced.

Furthermore, in the air flow direction D2, the distance from the discharge electrode 30a to the protective piece 43a and the distance from the discharge electrode 30a to the protective piece 53a are greater than the respective distances shown in Figure 6 of the third embodiment described below. Therefore, the adverse effects of the protective pieces 43a and 53a on the discharge performance of the discharge electrode 30a can be further reduced.

Furthermore, by separating the electrode protection unit 40a and the electrode protection unit 50a, a cleaning member (not shown) can be moved in the arrangement direction D1. This makes it easy to clean the discharge electrode 30a.

The configuration of the pair of electrode protection parts 40b, 50b for protecting the discharge electrode 30b is similar to the configuration of the pair of electrode protection parts 40a, 40b for protecting the discharge electrode 30a. Therefore, a description thereof will be omitted.

The discharge electrode 30a is protected by a pair of electrode protection parts 40a, 50a, and the discharge electrode 30b is protected by a pair of electrode protection parts 40b, 50b. This prevents the discharge electrodes 30a, 30b from coming into contact with the workbench, etc., even if the discharge device 1 falls over on the workbench, etc. Furthermore, unless intentional, the discharge electrodes 30a, 30b can be prevented from coming into contact with surrounding objects.

The opposing distance between the pair of electrode protectors 40a, 50a is greater at the other end (pillars 42a, 52a) far from the side surface 13 than at the other end (pillars 41a, 51a) far from the side surface 13, which is one of the four side surfaces 13-16 constituting the housing 11. That is, the opposing distance between the inner protrusions 45a and 55a far from the side surface 13 is greater than the opposing distance between the outer protrusions 44a and 54a near the side surface 13. Similarly, the opposing distance between the pair of electrode protectors 40b, 50b is greater at the other end (pillars 42b, 52b) far from the side surface 14 than at the other end (pillars 41b, 51b) near the side surface 14 near the edge, which is one of the four side surfaces 13-16 constituting the housing 11. That is, the opposing distance between the inner protrusions 45b and 55b, which are far from the side surface 14, is greater than the opposing distance between the outer protrusions 44b and 54b, which are closer to the side surface 14. Therefore, when workers and end users work from the side surfaces 13 and 14, it is possible to prevent fingers or other objects from coming into contact with the discharge electrodes 30a and 30b unless intentionally. That is, the pair of electrode protectors 40a and 50a prevents fingers or other objects from entering from the direction from side surface 13 toward side surface 14 (specific direction). Similarly, the pair of electrode protectors 40b and 50b prevents fingers or other objects from entering from the direction from side surface 14 toward side surface 13 (specific direction).

Furthermore, protective pieces 43a and 43b protect the side 15 of the discharge electrodes 30a and 30b, and protective pieces 53a and 53b protect the side 16. Therefore, when workers and end users work from the opposing side 15 and 16, they can prevent their fingers and other objects from coming into contact with the discharge electrodes 30a and 30b unless they do so intentionally.

In this way, when attaching the discharge device 1 to electrical equipment, regardless of which side of sides 13 to 16 the worker or end user works from, the electrode protection parts 40a, 40b, 50a, 50b prevent fingers or other objects from coming into contact with the discharge electrodes 30a, 30b. This makes it easy to attach and detach the discharge device 1 to and from electrical equipment. In embodiment 1, the connector part 21 is provided on side 14 in the arrangement direction D1. Therefore, for example, the worker or end user can attach or detach the discharge device 1 by applying force from the side of sides 13 and 14 and sliding the connector part 21 in the arrangement direction D1.

Furthermore, one column portion 41a and the other column portion 42a of the electrode protection portion 40a are provided on two different side surfaces 13, 15. Similarly, one column portion 51a and the other column portion 52a of the electrode protection portion 50a are provided on two different side surfaces 13, 16. Therefore, the pair of electrode protection portions 40a, 50a are less likely to deform due to forces applied in both the short direction (i.e., the air flow direction D2) and the long direction (i.e., the arrangement direction D1). This more reliably protects the discharge electrode 30a.

One column portion 41b and the other column portion 42b of the electrode protection portion 40b are provided on two different side surfaces 14, 15. Similarly, one column portion 51b and the other column portion 52b of the electrode protection portion 50b are provided on two different side surfaces 14, 16. Therefore, the pair of electrode protection portions 40b, 50b are also less likely to deform due to forces applied in both the short and long directions. This more reliably protects the discharge electrode 30b.

In addition, because the thickness of each pillar is greater than the thickness of the side surface on which the pillar is formed, the strength of the electrode protection parts 40a, 40b, 50a, 50b is increased compared to when the side surface is simply extended to form pillars of the same thickness as the side surface.

As described above with reference to Figures 1 to 4, the discharge device 1 according to the first embodiment includes a housing 11, discharge electrodes 30a and 30b, and electrode protectors 40a, 50a, 40b, and 50b. The housing 11 has an opening 12 that is open on one side. The discharge electrodes 30a and 30b protrude from the opening 12. The pair of electrode protectors 40a and 50a face each other across the discharge electrode 30a, with the distance between them varying between one end and the other. The pair of electrode protectors 40b and 50b also face each other across the discharge electrode 30b, with the distance between them varying between one end and the other. By making the distance between the sides that are expected to be touched by workers and end users shorter than the distance between the sides that are expected not to be touched, a discharge device 1 can be provided that protects the discharge electrodes 30a and 30b by preventing the intrusion of objects from a specific direction.

<Embodiment 2>
Fig. 5 is a plan view of the discharge device 1 according to the embodiment 2. In Fig. 5, the same or corresponding parts as those in Figs. 1 to 4 are designated by the same reference numerals and description thereof will not be repeated.

In the discharge device 1 according to embodiment 2 shown in Figure 5, the protective piece 43a-1 is L-shaped when viewed from the protruding direction D3 (see Figure 1, etc.) of the discharge electrodes 30a, 30b. While the protective piece 43a in embodiment 1 is U-shaped due to having an outer protruding portion 44a and an inner protruding portion 45a, the protective piece 43a-1 in embodiment 2 is L-shaped due to having only the outer protruding portion 44a and no inner protruding portion 45a. The electrode protective portions 40b, 50a, 50b also have L-shaped protective pieces 43b-1, 53a-1, 53b-1 when viewed from the protruding direction D3.

As in embodiment 1, in embodiment 2, the opposing distance between the pair of electrode protectors 40a, 50a is greater on the other end side (the side of pillars 42a, 52a) far from the side surface 13 than on the one end side (the side of pillars 41a, 51a) closer to the side surface 13. In other words, the opposing distance between pillars 42a and 52a far from the side surface 13 is greater than the opposing distance between outer protrusions 44a and 54a close to the side surface 13.

Similarly, the opposing distance between the pair of electrode protectors 40b, 50b is greater on the other end (pillars 42b, 52b) farther from side surface 14 than on the one end (pillars 41b, 51b) closer to side surface 14 on the edge side of the four side surfaces 13-16 that make up the housing 11. In other words, the opposing distance between pillars 42b and 52b farther from side surface 14 is greater than the opposing distance between outer protrusions 44b and 54b closer to side surface 14.

Therefore, when workers and end users work from the sides 13 and 14 where the opposing distance is small, their fingers or other objects can be prevented from coming into contact with the discharge electrodes 30a and 30b unless they do so intentionally.

Even if the protective piece 43a-1 does not have an inner protrusion 45a, the strength of the electrode protection part 40a can be increased by making the thickness of the pillar part 42a thicker than the thickness of the side surface 15. The strength of the pillar parts 42b, 52a, and 52b can also be increased by making them thicker than the thickness of the side surface.

<Embodiment 3>
Fig. 6 is a plan view of a discharge device 1 according to embodiment 3. In Fig. 6, the same or corresponding parts as those in Figs. 1 to 4 are designated by the same reference numerals and description thereof will not be repeated.

In the discharge device 1 according to embodiment 3 shown in Figure 6, the protective piece 43a-2 has a linear shape that is inclined relative to the side surface 15 of the housing 11 when viewed from the protruding direction D3 of the discharge electrodes 30a, 30b (see Figure 1, etc.). One end of the protective piece 43a-2 that is closer to the outside of the housing 11 in the protruding direction D3 is supported by the pillar portion 41a, and the other end that is closer to the inside of the housing 11 is supported by the pillar portion 42a. The protective piece 43b-2 also has a linear shape that is inclined relative to the side surface 15 when viewed from the protruding direction D3. The protective pieces 53a-2, 53b-2 have a linear shape that is inclined relative to the side surface 16 when viewed from the protruding direction D3.

As in Embodiments 1 and 2, in Embodiment 3, the corresponding distance between the pair of electrode protectors 40a, 50a is greater on the other end side (pillar portions 42a, 52a side) farther from the side surface 13 than on the one end side (pillar portions 41a, 51a side) closer to the side surface 13. Similarly, the opposing distance between the pair of electrode protectors 40b, 50b is greater on the other end side (pillar portions 42b, 52b side) farther from the side surface 14 than on the one end side (pillar portions 41b, 51b side) closer to the side surface 14. Therefore, when workers and end users work from the side surfaces 13, 14 where the opposing distance is smaller, it is possible to prevent fingers or the like from coming into contact with the discharge electrodes 30a, 30b unless intentionally.

In addition, in embodiment 3, the strength of the electrode protection part 40a can be increased by making the thickness of the pillar part 42a thicker than the thickness of the side surface 15. The strength of the pillar parts 42b, 52a, and 52b can also be increased by making them thicker than the thickness of the side surface.

<Fourth Embodiment>
In the fourth embodiment, an electrical device equipped with the discharge device 1 according to the first to third embodiments will be described. Fig. 7 is a longitudinal cross-sectional view of an air purifier 100 according to the fourth embodiment. The air purifier 100 is an example of an electrical device. In the air purifier 100, an intake port 102 is provided on the lower rear surface of a main body 101. An outlet 103 is provided on the upper surface of the main body 101, and an outlet 104 is provided on the upper front surface. Note that only one of the outlets 103 and 104 may be provided.

An air passage 111 is provided inside the main body 101, connecting the air inlet 102 with the air outlets 103 and 104. A blower fan 112 is installed near the air inlet 102 in the air passage 111. The blower fan 112 is a blowing device such as a crossflow fan, and draws external air into the air passage 111 through the air inlet 102. The air inlet 102 is also blocked by a filter 114. The filter 114 removes dust and other particles contained in the air drawn into the air passage 111 from the air inlet 102. A lattice-shaped fan guard 115 is installed between the filter 114 and the blower fan 112.

A mounting hole 113 is provided near the air outlet 104 of the air passage 111. The discharge device 1 is attached to the mounting hole 113. The housing 11 of the discharge device 1 is inserted into the mounting hole 113, and the discharge electrodes 30a, 30b and electrode protectors 40a, 40b, 50a, 50b protrude into the air passage 111. Ions and other substances generated by the discharge device 1 are released into the air passage 111. Air containing ions and other substances is blown outward from the air outlets 103, 104. The air flow in the air purifier 100 is indicated by arrows in Figure 7. The air flow indicated by the arrows in Figure 7 corresponds to the air flow direction D2 shown in Figure 1, etc.

The discharge device 1 may be placed anywhere on the air duct 111. In the illustrated example, it is placed near the air outlet 104 so that end users can easily replace and clean the discharge device 1.

Embodiments of the present invention have been described above with reference to the drawings (Figs. 1 to 7). However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the spirit of the present invention.

For example, in the above embodiment, the discharge device 1 is configured to include two discharge electrodes 30a, 30b. However, the discharge device 1 may also be configured to include only one discharge electrode (e.g., only discharge electrode 30a). A pair of electrode protectors 40a, 50a are provided around the discharge electrode 30a to protect the discharge electrode 30a. This configuration assumes that workers and end users will attach and detach the discharge device 1 to and from electrical equipment by holding the side 13, which faces the side 14 on which the connector portion 21 is provided. In this scenario, the opposing distance between the pair of electrode protectors 40a, 50a is greater on the other end (the side of pillars 42a, 52a) farther from the side 13 than on the one end (the side of pillars 41a, 51a) closer to the side 13, which is expected to be touched by workers and end users. Therefore, when workers and end users hold the side 13, it is possible to prevent their fingers or other objects from coming into contact with the discharge electrode 30a, unless unintentionally.

The discharge device according to the present invention can be used as a discharge device that generates ions, electrons, ozone, radicals, active species, etc. through discharge. Furthermore, the discharge device according to the present invention can be installed in electrical appliances such as air purifiers, air conditioners, fans, refrigerators, and vacuum cleaners.

1 Discharge device 11 Housing 12 Openings 13 to 16 Side surface 20 Sealing portion 21 Connector portion 22 Terminals 30a, 30b Discharge electrodes 40a, 40b, 50a, 50b Electrode protection portion 41a, 41b, 42a, 42b, 51a, 51b, 52a, 52b Pillar portion 43a, 43a-1, 43a-2, 43b, 43b-1, 43b-2, 53a, 53a-1, 53a-2, 53b, 53b-1, 53b-2 Protective pieces 44a, 44b, 54a, 54b Outer protrusions 45a, 45b, 55a, 55b Inner protrusions 100 Air purifier (electrical equipment)
101 Main body 102 Intake port 103, 104 Outlet port 111 Air passage 112 Blower fan (blower device)
113 Mounting hole 114 Filter 115 Fan guard D1 Arrangement direction D2 Air flow direction D3 Protrusion direction T13, T15, T16, T41a, T42a, T51a, T52a Thickness

Claims (8)

a housing having an opening on one side;
a discharge electrode protruding from the opening;
a pair of electrode protection parts that face each other across the discharge electrode, the distance between which is different on one end side than on the other end side ;
the discharge electrodes include a first discharge electrode and a second discharge electrode that are spaced apart from each other in a plan view,
the pair of electrode protection parts includes a first pair of electrode protection parts sandwiching the first discharge electrode and a second pair of electrode protection parts sandwiching the second discharge electrode,
an opposing distance between the first pair of electrode protection parts is larger on the one end side that is closer to one of four side surfaces constituting the housing than on the other end side that is farther from the one side surface;
an opposing distance between the second pair of electrode protection parts is larger on the one end side farther from the other side surface than on the other end side closer to the one side surface opposite to the one side surface;
The other end side of the first pair of electrode protection parts faces the other end side of the second pair of electrode protection parts . The discharge device according to claim 1 , wherein the electrode protection portion has a U-shaped protection piece when viewed from the protruding direction of the discharge electrode. The discharge device according to claim 1 , wherein the electrode protection portion has an L-shaped protection piece when viewed from the protruding direction of the discharge electrode. The discharge device according to claim 1 , wherein the electrode protection portion has a linear protection piece that is inclined relative to a side surface of the housing when viewed from the protruding direction of the discharge electrode. 5. The discharge device according to claim 2 , wherein the protective piece is supported by two pillars provided on two perpendicular sides of four sides constituting the housing. The discharge device according to claim 5 , wherein the thickness of the pillar portion is greater than the thickness of the side surface on which the pillar portion is provided. The discharge device according to claim 1 , further comprising a connector portion provided in an arrangement direction of the discharge electrodes. The discharge device according to any one of claims 1 to 7 ;
an air blower that blows air into an air path that includes a space in which the discharge electrode of the discharge device is arranged.