JPH0427550Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an air purifier that collects dust and smoke from cigarettes, etc. floating in the air.

(b) Prior art As a technology prior to this invention, Utility Model Application No. 59-70741
There is an air purifier described in Japanese Utility Model Publication No. 58-112449. This air purifier was designed to improve ease of assembly by making the ionization part a unit, but since the dust collection part was also made into a unit, it was not possible to expand the dust collection area, This type is different from the air purifier to which the invention is intended.

(c) Problems to be solved by the invention This invention separates the space in front of the filter body into two layers using a guide plate, and simplifies the structure and facilitates assembly of the ionization section disposed at the end of the guide plate. The present invention provides an air purifier with improved comfort and safety.

(d) Means for solving the problem The present invention consists of a main body with a blower installed inside, a filter body disposed to cover the air inlet of the blower, and a detachable body located in front of the filter body. An ionizer that can be attached and detached to the intake grille, a guide plate that separates the space between the intake grille and the filter body into two layers, and a two-layer space air passage formed between the end of the guide plate and the main body. The ionization electrode and the counter electrode are attached to the mounting case body of the ionization unit, which has an opening on the side facing the space between the intake grille, the guide plate body, and the filter body, and the opening can be opened and closed by the intake and exhaust grille body. This method solves the problem even if it is a method that covers the above.

(E) Effect This invention has a removable mounting case body for the ionization unit, which allows it to be removed independently without affecting the filter body, and by covering the opening with the suction/exhaust grille, it is possible to connect the ionization electrode to the counter electrode. No accidental contact.

(f) Examples The present invention will be explained based on the illustrated embodiments.

First, a description will be given based on a first embodiment shown in FIGS. 1 to 18.

FIG. 1 shows a cross-sectional view of the air cleaner 1. FIG. The air purifier 1 can be used on the floor as shown in Figure 3.
It can be used for wall hanging as shown in FIG. 4. In the following description, terms indicating positions such as up, down, left, right, front and back will be used with reference to the floor-standing usage state shown in FIG. 3, unless otherwise specified.

FIG. 5 is a cross-sectional view taken at the high voltage application part to the needle-like ionization electrode 21 and the plate-like counter electrode 22 in the ionization section 6, and FIG. Cut longitudinal sectional view, No. 7
The figure is a vertical cross-sectional view cut at the safety switches 60 and 61 that are cut when the front cover body 3 installed inside the main body 4 is attached and detached, and FIG. FIG. 9 is an exploded cross-sectional view with the front cover body 3 and filter body 8 removed, FIG. 10 is a front view of the control box body 10, and FIG.
The figure is a perspective view of the ionizing unit 6 removed from the main body 4, FIG. 12 is a perspective view of the ionizing unit 6 removed from the main body 4 with the intake/exhaust grill body 20 opened, and FIG. 13 is a cutaway of the main part of the ionizing unit 6. A perspective view, FIG. 14 shows the ionization unit 6 and main body 4 with the intake/exhaust grille 20 opened.
15 is a longitudinal sectional view showing the relationship between the control box 10 and the recess 11 of the main body 4, FIG. 16 is a cross sectional view of the same, and FIG. 17 is the air cleaner 1. 18th cross-sectional view of the main part showing the air flow of
The figure is an electrical circuit diagram of the air cleaner 1.

The air purifier 1 includes a main body 4 having a removable front cover 3 that forms an intake grille 2, a blower device 5 mounted on the back half of the main body 4, and an ionizer 6 mounted on both sides of the front half of the main body 4. It has a detachable guide plate 7 that separates the front space inside the main body 4 into two layers, front and rear, and a filter body 8 located behind the guide plate 7 with a ventilation interval. The front cover body 3, the main body 4, the guide plate body 7, and the components of the air cleaner 1 other than the electrical connection parts are formed of an insulating material, and in this embodiment, synthetic resin such as ABS resin or polypropylene resin is used. There is. A grill-like air outlet 9 is formed on the right half of the upper surface of the main body 4, and a recess 11 for housing a detachable control box 10 is formed on the left half of the upper surface.

The blower device 5 includes a partition plate body 13 that partitions the inside of the main body 4 into front and rear parts and has an intake port 12 formed in the center, and a fan case part 14 that is integrally formed with the partition plate body 13.
, a motor 15 mounted and supported on a motor support portion supported by a support rod at the center of the intake port 12;
5 and a blower blade 16 driven by the fan. The blower blade 16 is a thin and large-diameter Shirotsuko fan, and blows the air sucked in through the intake port 12 to the outside of the main body 4 through the blowout port 9. For the intake port 12,
Air is supplied from outside the main body 4 through the intake grille 2, and the air is filtered from dust, cigarette smoke, etc. by the filter body 8. Near the rear of the outlet 9, a needle electrode 17 and a plate electrode 18 are formed for ionizing the purified air. An air cleaner control circuit board, which will be described later, is attached to a portion surrounded by the partition plate body 13, the fan case portion 14, and the main body 4. The upper wall portion of the main body 4 in which the air outlet 9 and the recessed portion 11 are formed is formed as a separate member and then integrated into one body by a connecting means such as a screw or an elastic engagement.

After being assembled as a separate component, the ionization section 6 is attached to the corners of the left and right inner sides of the main body 4 and the left and right sides of the partition plate body 13 over the entire height in the vertical direction. The ionization unit 6 includes a mounting case body 19 formed in a box shape excluding two longitudinally adjacent side walls of an elongated rectangular parallelepiped, and an intake/discharge unit formed at the opening edge of the mounting case body 19 in the longitudinal direction with a thin hinge so as to be openable and closable. It consists of a grill body 20, a needle-shaped ionization electrode 21 attached to the inner surface of the rear wall of the mounting case body 19, and a plate-shaped counter electrode 22. A plurality of needle-shaped ionization electrodes 21 are provided at regular intervals in the longitudinal direction and protrude through the rear wall, and the tip protruding into the mounting case body 19 is sharp, and the end protruding outside the mounting case body 19 is a conductive plate. They are electrically connected at 23. The plate-shaped counter electrode 22 is formed by bending and standing a plate part from each piece of a comb-shaped conductive plate part,
The plate-shaped counter electrode 22 is attached to the inner surface of the rear wall of the mounting case body 19, and is erected so as to partition it from the needle-shaped ionization electrode 21. A protrusion 24 surrounding the needle-shaped ionization electrode 21 is formed on the inner surface of the rear wall of the mounting case body 19 . The plate-shaped counter electrode 22 is temporarily held by a protrusion 24 and a protrusion 25 formed on the inner surface of the side wall of the mounting case body 19. The protrusion 25 is a triangular protrusion for smooth installation. A high voltage is applied between the needle-shaped ionization electrode 21 and the plate-shaped counter electrode 22, and corona discharge occurs at the tip of the needle-shaped ionization electrode 21, generating ions, and these ions adhere to dust, etc. in the air. and electrifies the dust. By applying a high voltage, not only a corona discharge from the tip of the needle-shaped ionizing electrode 21 but also a creeping discharge toward the plate-shaped counter electrode 22 is generated along the inner surface of the rear wall of the mounting case body 19, and a sufficiently high voltage is generated. It may not be possible to apply voltage. However, by forming the protrusion 24 around the acicular ionizing counter electrode 22, the creeping distance increases and creeping discharge can be prevented.

The suction/exhaust grille body 20 is formed in a step-like shape, and has an inlet grille 26 and an outlet grille 27 formed on its inner wall, and a partition plate 28 is provided between the inlet grille 26 and the outlet grille 27. The inner edge of the rear wall of the mounting case body 19 has an uneven locking flange 29, and when the edge outlet grille 27 of the intake/exhaust grille body 20 engages with the uneven locking flange 29, the mounting case body 19 is It is closed by an intake/exhaust grill body 20. Intake/exhaust grill body 20
When the electrodes 21 and 22 are closed, the needle-like ionization electrode 21 and the plate-like counter electrode 22 are covered, thereby preventing injury caused by direct contact of fingers to the electrodes 21 and 22.
This also prevents deformation and damage. The partition plate 28 is supported by coming into contact with the end of the plate-shaped counter electrode 22, so that the suction/exhaust grill body 20 can be supported reliably. Further, due to the partition plate 28 and the contact between the partition plate 28 and the plate-shaped counter electrode 22, the ventilation path of the ionization section 6 can be reliably divided. Furthermore, by forming the suction grill 26, the suction airflow is rectified, and the needle-shaped ionization electrode 2
The U-turn at the back of the ionization section 6 can be smoothly performed because the air flow is uniform and straight toward the counter electrode 1 and the plate-shaped counter electrode 22. After making a U-turn, the flow toward the outlet grille 27 is rectified by the plate-like counter electrode 22 and a passage is formed by the partition plate 28, resulting in a uniform straight flow, resulting in less ventilation resistance and electrification of dust by ion generation. Things are done efficiently.

Ribs 30 projecting outward from the ionizing portion 6 are formed at several locations on the air outlet grille 27 of the intake/exhaust grille body 20, and the edges of the ribs 30 form inclined portions 31. The ionization section 6 is inserted and mounted between both side walls of the main body 4 and partition walls 32 formed on both sides of the partition plate body 13. Attachment is performed using screws 34 that are screwed into bosses 33 protruding from the partition plate body 13. screw 3
At 4, the plate-shaped counter electrode 22 and the mounting case body 19 are fixed to the partition plate body 13. The intake/exhaust grill body 20 can be opened and closed while the ionization section 6 is in a fixed state. Power is supplied to the needle-shaped ionization electrode 21 and the plate-shaped counter electrode 22 by contacting the conductive plate 23 and the plate-shaped counter electrode 22 with elastic power supply pieces 35 and 36 that protrude forward from the partition plate 13 . The elastic power feeding pieces 35 and 36 are provided to protrude through the front side from the rear surface of the partition plate body 13, and partition the insulating partition plates 37 and 38 in order to prevent contact between the elastic feeding pieces 35 and 36 and discharge due to high voltage application. The plate body 13 and the mounting case body 19 are integrally formed.

In the area surrounded by the partition wall 32 of the partition plate body 13 and the partition walls 39 formed at the upper and lower ends of the partition plate body 13, a space is maintained between the partition plate body 13 and the air intake port 12.
A breathable electrode plate body 40 for supporting the filter
is supported. The electrode plate body 40 is formed of a lath plate, and locking pieces formed on both left and right edges are connected to the partition wall 3.
9, and is fixed to a boss 41 protruding from the partition plate body 13 with a screw. Support portions 42 for electrode plates 40 are formed at several locations on the partition wall 39 . In this embodiment, the electrode plate body 40 is curved and supported by a support portion 42 in a dogleg shape on a plane cross section. By supporting the electrode plate body 40 in a curved manner, the part facing the electric motor 5 protrudes most forwardly, and the electric motor 5 is moved closer to the partition plate body 1 than the intake port 12.
It can be supported by protruding from the front side of 3.
The dimensions of the air cleaner 1 in the front-rear direction can be reduced.

The filter body 8 is supported along the electrode plate body 40. Since the filter body 8 is also supported in a curved manner, the area of the filter body 8 can be increased compared to a case where the filter body 8 is supported flatly, which leads to an improvement in the dust collection ability. The left and right edges of the filter body 8 are locked by ribs 30 formed in the ionization section 6, thereby preventing the ends from lifting off from the electrode plate body 40. Slanted portion 31 of rib 30 and ionization portion 6
The stair structure serves as a guide when installing the removed filter body 8. The electrode plate body 40 is grounded,
By collecting the charged dust, the filter body 8 is prevented from being charged, and a stable electrical adsorption force can be maintained at all times.

A prefilter body 43 is attached to the inner surface of the front cover body 3 so as to cover the intake grill part 2. The guide plate 7 has a locking part 44 at the lower center end thereof locked to the inner lower support part 45 of the front cover body 3, and a fixing part 46 at the upper center end thereof to the boss 47 at the upper inner surface of the front cover body 3.
It is fixed with decorative screws 48 that are screwed into. With the guide plate 7 attached to the front cover body 3,
The prefilter body 43 is pressed and supported on the inner surface of the front cover body 3 by a rib 49 extending vertically at the center of the guide plate 7 and projections 50 protruding from both sides. A ventilation path is formed between the prefilter body 43 and the guide plate 7. The guide plate 7 is formed into a dogleg shape in plan view, similar to the electrode plate body 40, and its curvature is smaller than that of the electrode plate body 40. Air sucked in from the intake grill section 2 and passed through the prefilter body 43 collects large amounts of dust at the prefilter body 43. The flow of the air that has passed through the prefilter body 43 is changed by the guide plate 7, and the air flows in both directions.
It is guided to the suction grille 26 of the ionization section 6. When the front cover body 3 is attached to the main body 4, both sides of the guide plate 7 come into contact with the partition plate 28 of the ionization section 6, and the air sucked in from the intake grill section 2 is efficiently guided to the ionization section 6. In this embodiment, by covering the intake grille portion 2 with the prefilter body 43, the pressure in the air passage between the prefilter body 43 and the guide plate 7 becomes low. As a result, the tendency of the intake grille 2 to be sucked in intensively from the portions of the intake grille 2 that are close to the ionization portion 6 is reduced.
It is something that can be done by inhaling it from the whole. Further, since the distance between the prefilter body 43 and the guide body 7 increases from the center toward both sides, the pressure can be lowered in the center portion, and air can be taken in from the entire intake grille portion 2 more efficiently. Furthermore, by separating the ventilation passages into left and right sides by the ribs 49, the flow of intake air becomes smoother.

A rib 51 extending in the vertical direction is formed at the center of the rear surface of the guide plate 7, and a plurality of protrusions 52 extending in the left-right direction are formed on both sides. The filter body 8 is pressed and held by the ribs 51 and the projections 52 with the front cover body 3 attached to the main body 4. Therefore,
Even when the air cleaner 1 stops and the adhesion force of the filter body 8 to the electrode plate body 40 due to wind pressure is lost, the filter body 8 is reliably held. The projecting piece 52 makes the wind blown out from the blow-off grille 27 of the ionizing section 6 more straight-forward, and sends it to the center of the filter body 8, so that the filter body 8 collects dust uniformly.

The structure for attaching and detaching the front cover body 3 to the main body 4 is an elastic locking structure. The front cover body 3 is attached to cover the main body 4, and has locking protrusions 53, 54 formed on the inner surfaces of the rear ends of the upper and lower walls. An attachment/detachment operation protrusion 55 is formed on the outer surface of the lower wall of the front cover body 3. A locking piece 56 is formed on the upper inner surface of the front cover body 3. An elastic locking body 57 is provided at a portion of the main body 4 corresponding to the locking protrusions 53, 54 and the locking piece 56 of the front cover body 3.
A locking portion 58 and a hook hole 59 are formed. The front cover body 3 has a locking protrusion 54 and a locking piece 5 on its upper part.
6 is engaged with the locking portion 58 and the hook hole 59, and then the lower locking protrusion 53 is engaged with the elastic locking body 57. The structure for attaching and detaching the front cover body 3 to the main body 4 works most effectively when the air cleaner 1 is mounted on a wall. That is, when the front cover body 3 is removed when used as a wall-mount, pull the upper part toward you and release the locking protrusion 5.
3 and the elastic locking body 57 are disengaged. At this time, if the front cover body 3 is not held by hand, it will tend to fall forward, but the locking piece 56 will catch on the hook hole 59, thereby preventing the front cover body 3 from falling.

A high voltage is applied to the ionization unit 6 during use, and if the front cover body 3 is accidentally removed during operation, it is dangerous and the front cover body 3
If the air cleaner 1 is operated without being securely attached, the function of the air cleaner 1 will not be fully demonstrated.
Safety switches 60 and 61 are installed so that the air cleaner 1 can be operated only after the front cover body 3 is securely attached to the main body 4. The safety switch 60 is attached to the lower central front part of the main body 4, and the safety switch 61
is attached to the center front part of the main body 4, and the safety switch 6
0, 61 are operation pieces 62 formed on the front cover body 3;
The cut is made at 63. Therefore, the safety switch 6 cannot be activated until the front cover body 3 is securely attached to the main body 4.
0.61 is input.

A locking portion 64 is formed on both sides of the center of the lower surface of the control box body 10, and is electrically connected to the main body 4 by a control cord 65. The control cord 65 is pulled out from within the recess 11. The control box body 10 has its control code 65
The end that is not pulled out is supported by a step 66 formed on the right inner side of the recess 11, and the locking portion 6 of the control box 10
4 is housed in the recess 11 by supporting the center of the other end side with the protrusion 67. When stored, the elastic locking body 6 is attached to the locking portion 64 of the control box body 10.
8 engages. The lower part of the recess 11 is the control cord 65
It becomes a storage and holding space. To take out the control box 10 from the recess 11, use the control cord 6 of the control box 10.
When the drawer end of 5 is pushed inward, the protrusion 6
The elastic locking body 68 rotates like a seesaw around 7.
is removed from the locking part 64, and the control box body 1 is removed from the recess 11.
0 pops out. The locking portion 64 is also used for engagement with a support fitting when the control box body 10 is mounted on a wall in the wall-mounted use shown in FIG.

The control box body 10 includes a stop switch 69 that stops the operation of the air cleaner 1, an operation changeover switch 70 that selects automatic operation using a gas sensing device, weak operation, standard operation, and rapid cleaning operation, and a timer operation setting switch 71. , and a sensitivity changeover switch 72 for changing the sensitivity of the gas sensing device. The control box body 10 is equipped with a light-emitting indicator that indicates the operating status, and includes an automatic, weak, standard, and rapid operation indicator 73;
It has a time indicator 74 for 1 hour and 30 minutes, and a dirt indicator 75 that shows the degree of dirt in two stages. The control box body 10 is equipped with a gas sensing element 76 that senses gas in the air. When the operation changeover switch 70 is operated, the setting can be made as follows: automatic → weak → standard → rapid → automatic, and the operation display 73 lights up accordingly. When automatic operation is set, the automatic operation indicator 73 lights up, and the operation indicators 73 corresponding to the current operating status of weak, standard, and rapid are illuminated as appropriate. The dirt indicator 75 is formed in red and green, and when the degree of dirt is high, the red light is lit, and when the dirt degree is low, the green light is lit. The sensitivity changeover switch 72 can adjust the start of operation during automatic operation.

The control circuit is constructed as shown in FIG. The control circuit includes a gas sensing element 76, a gas sensing section 78 that processes the output, A/D converts it, and processes it in a comparator 77, an operation changeover switch 70, a timer operation setting switch 72, and a stop switch 6.
An operation control unit 79 formed of a microcomputer, etc., processes input from the air purifier 9 and sets the operation mode of the air purifier 1, and processes signals from the gas sensing unit 78 to perform predetermined automatic operation. An automatic operation control unit 80 formed of a microcomputer or the like that selects and judges a mode, and an automatic electric motor that compares and processes automatic operation control signals from the automatic operation control unit 80 and operation control unit 79 and outputs a motor control signal. A control unit 81 , a switching unit 82 whose switching drive is controlled by a signal from the operation control unit 79 or the automatic motor control unit 81 , a stall determination unit 83 that determines whether the electric motor 15 has stopped operating, and a stall determination unit 83 It consists of a high voltage section 84 that is energized only when the electric motor 15 is in operation, and a drive power supply section 85 that supplies power to each control section.

When the air cleaner 1 is connected to the commercial power source 86, the initial reset circuit 87 controls the air cleaner 1 to maintain the stopped state. Even if the air cleaner 1, so-called electric motor 15, is stopped, the gas sensing section 78 and automatic operation control section 80 are still being driven.
The dirt indicator 7 indicates the state detected by the gas sensing unit 78.
Displayed at 5. However, due to the characteristics of the gas sensing element 76, it usually takes 5 minutes to output a predetermined value corresponding to the regular gas concentration, so automatic operation is not performed until 5 minutes have elapsed. , the green dirt indicator 75 blinks for 5 minutes. In this example, in order to shorten the automatic operation disabled time from 5 minutes, the automatic operation disabled time is set to 2 minutes, and the output value due to the increase in dirt becomes smaller than normal for the 3 minutes from 2 minutes to 5 minutes. This increases the sensitivity and ensures accurate autonomous driving. After two minutes have elapsed, the green dirt indicator 75 changes from flashing to lit. When an increase in dirt is detected, the red dirt indicator 75 is switched on.

A second embodiment shown in FIGS. 19 to 23 will be described.

In this embodiment, the electrode plate body 40 of the first embodiment is arranged in a flat plate shape, the filter body 8 is similarly arranged in a flat plate shape, and the guide plate body 7 is also formed in a flat plate shape. The guide plate body 7 is placed between the ends of the partition wall 39, and the elastic locking pieces 90 are locked in the engagement holes 91 of the partition wall 39 so that the guide plate body 7 can be attached and detached. Elastic locking piece 9
0, a handle 92 is formed extending forward, and the guide plate 7 is attached to and removed from the partition wall 39 by pinching between the handle 92 and the protrusion 93 of the guide plate 7.

The mounting case body 19 of the ionization unit 6 has a substantially doglegged cross section, and its front wall is formed into a flat plate shape, and a plate-shaped counter electrode 22 is mounted thereon. The rear wall portion of the mounting case body 19 has a curved plate shape, and a needle-shaped ionization electrode 21 is mounted thereon. The opening located inside the mounting case body 19 is connected to the front edge of the mounting case body 19 by a thin hinge, and is connected to the intake/exhaust grill body 2 which can be opened and closed freely.
Closed at 0. The intake/exhaust grill body 20 has an elastic locking piece 94 formed at its moving end attached to the case body 19.
The opening is held in a closed state by being engaged with the engagement hole 95 at the rear end. The intake/exhaust grill body 20 is the first
Unlike the embodiment, it is formed of a single grille, and is formed to be inclined so as to protrude inwardly toward the rear. The intake/exhaust grill body 20 serves as a guide when the filter body 8 is attached, and its rear end protrudes inward from the partition wall 32 to prevent the filter body 8 from coming off.

The ionization part 6 is detachably held by engaging elastic locking pieces 99 and 100 with engagement holes 97 and 98 in the partition wall 32 and the outer wall 96 formed in the partition plate body 13.

When the ionization section 6 is attached to the partition plate body 13, the partition wall 32 comes close to the elastic locking piece 94 and prevents it from coming off from the engagement hole 95.

The intake/exhaust grill body 20 in the present invention only needs to be openable and closable with respect to the mounting case body 19, and may be rotatable or detachable.

(g) Effects of the invention The present invention allows the suction side opening of the removable ionization unit to be covered with a suction/exhaust grill body so that it can be opened and closed, thereby improving safety and attachment/detachment of the ionization unit regardless of the filter body.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, and FIGS. 1 to 18 show the first embodiment. Figure 3 is a perspective view of floor-standing use, Figure 4 is a perspective view of wall-mounted use, Figure 5 is a cross-sectional view taken at a different point from Figure 1, and Figures 6 to 8. 9 is an exploded cross-sectional view, FIG. 10 is a front view of the control box, FIG. 11 is a perspective view of the ionization section, and FIG. 12 is a cross-sectional view of the air cleaner. 13 is a partial cross-sectional perspective view of the ionization section, FIG. 14 is an enlarged sectional view of the ionization section portion with the intake/exhaust grill body opened, and FIG. 15 is a longitudinal sectional view of the control box holding section. Figure 16 is a cross-sectional view of the same.
Figure 17 is an enlarged sectional view of the main parts, Figure 18 is a circuit diagram,
19 to 23 show the second embodiment, in which FIG. 19 is a cross-sectional view, FIG. 20 is a vertical cross-sectional view,
FIG. 21 is an exploded perspective view of the main part, FIG. 22 is an enlarged sectional view of the main part, and FIG. 23 is a perspective view of the ionization section. 1...Air purifier, 2...Intake grille, 3...
...Front cover body (main body), 4 ... Main body, 5 ... Air blower, 6 ... Ionization section, 7 ... Guide plate body, 8
...Filter body, 19...Mounting case body, 20...
... Suction/exhaust grill body, 21... Ionization electrode, 22...
...Counter electrode.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A main body incorporating an air blower, a filter body disposed to cover the air intake port of the air blower, and an intake grille portion that is removably attached to the main body located in front of the filter body, A guide plate that separates the space between the intake grille and the filter body into two layers, and an ionization unit that is detachable from the two-layer space air passage formed between the end of the guide plate and the main body, The ionization electrode and the counter electrode are attached to the mounting case body of the ionization unit, which has an opening on the side facing the space between the intake grille, the guide plate body, and the filter body, and the opening is covered by the intake and exhaust grille body so that it can be opened and closed. Cleaner. 2. The air purifier according to claim 1, wherein the air intake and exhaust grille body is connected to the mounting case body by a thin hinge. 3. The air purifier according to claim 1 or 2 of the utility model registration claim, in which the ionization part is detachably attached with a screw.