JPH0215567Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD The present invention relates to an electrostatic precipitator having a safety device against electric shocks caused by malfunctions during maintenance of filters, etc. BACKGROUND OF THE INVENTION Generally, this type of electrostatic precipitator requires maintenance such as replacing filters contaminated by dust collection and cleaning the inside of the dust collector body. Therefore, it is essential to prevent accidents such as electric shock due to high voltage during maintenance. Therefore, it has been common practice to make the intake grill and filter removable for easy maintenance, and to provide the fuselage with a limit switch that is linked to each removal member and turns off the power circuit when the member is removed. Problems that the invention aims to solve Conventional electrostatic precipitators have problems such as the complexity of circuit wiring due to the provision of a limit switch for each removable member, an increase in the failure rate of the circuit, and an increase in component costs. Ta. The object of the present invention is to provide an electrostatic precipitator that is easy to assemble and has an inexpensive safety device with few failures. Means for Solving the Problems The electrostatic precipitator of the present invention has a dust collector body with a high-voltage ionization section inside, an intake grill and a filter that are detachably attached to the dust collector body. a limit switch provided with a pusher that is biased by the filter and turns on the power only when the filter is almost completely inserted into the dust collector body; and a limit switch that is biased by a spring body to house the filter when the intake grille is not attached to the dust collector body. protruding into the section to prevent the filter from being inserted and mounted;
When the intake grille is attached to the dust collector body, a stopper is provided to release the protrusion using a protruding piece provided on the intake grille, and the intake grille is attached to the dust collector body using a buckle rotatably provided on the dust collector body. The filter is characterized in that when the filter is inserted into the dust collector main body, it comes into contact with the buckle body and prevents the filter from rotating. Function According to this configuration, one limit switch can function as a safety device without having to provide each limit switch for each detachable member. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 13, 1 is a front body that fixes built-in parts and forms a part of the outer shell, and 2 is a rear body that faces this front body 1 and forms the outer shell. An intake grill 3 is detachably attached to the front. A counter electrode 5 facing the discharge wire 4 supported by the front body 1 is fixed to the intake grill 3 with a prefilter 6 in between, as shown in FIGS. 2 and 3. The intake grille 3 has intake holes 7 formed therein. Reference numeral 8 denotes a blower, which is composed of a motor 9 (indicated by a broken line) and a fan 10, and includes a front body 1 and a rear body 2.
It is held between. 11 is an intake port, 12 is a fan casing, and 13 is an exhaust duct, which forms an air passage through which exhaust air is discharged through a louver 14. A high voltage unit 15 supplies the discharge line 4 with the high voltage generated here. 16 is a main body switch which can be operated by either a push button 17 or a pull string 18. 19 is a limit switch, which turns on the power only when the filter 20 is almost completely inserted into the dust collector body as shown in Figure 8.
When the filter is installed as shown in Figures 9 to 11 in Figure 10, the power is turned off.
It is set up so that the state is 21 is a pusher of the limit switch 19. In detail, the filter 20 includes a filter frame 22, a dielectric filter 23,
It is composed of a fibrous activated carbon filter 24.
Reference numeral 25 denotes a buckle body, which is rotatably attached to the front body 1. When the intake grille 3 is attached, it is biased by a buckle spring 26 to cause the locking pawl 27 of the intake grille 3 to engage with the buckle body 25. The stop portion 28 is engaged (FIGS. 4 and 6). Reference numeral 29 denotes an attachment/detachment button, and by pressing this, the buckle body 25 rotates, the engagement between the locking pawl 27 and the locking portion 28 is released, and the intake grille 3 can be removed from the front body 1. . This buckle body 25 is formed with a rotation prevention protrusion 30, and when the intake grille 3 is attached to the dust collector body, it is almost in contact with the filter frame 22, and even if the attachment/detachment button 29 is pressed, the buckle body 25 cannot be rotated, and therefore the intake grille 3 cannot be removed.
31 is a protruding piece provided on the intake grille 3. When the intake grille 3 is attached to the front body 1, by pressing the contact 33 of the stopper 32, as shown in FIGS. 8, 10, and 12, Stopper spring 34
The protrusion 35 of the stopper 32 is rotated against the urging force of the stopper 32 so that the protrusion 35 of the stopper 32 is retracted from the inside of the filter accommodating portion 36.
37 is a recess formed in the filter frame 22;
As shown in the figure, the protrusion 35 is located and provided at or near the position where the filter 20 is pulled out of the dust collector body and the limit switch 19 is turned off. In the electrostatic precipitator having such a configuration, the dust-containing air sucked through the intake hole 7 of the intake grille 3 generates a high voltage between the discharge wire 4 and the counter electrode 5 (the counter electrode 5 is at ground potential). Dust is now charged by corona discharge caused by the application of . The charged dust is adsorbed by the filter 20 which is at the subsequent stage and is at ground potential.
Only purified air is exhausted to the outside of the machine via the intake port 11, fan casing 12, exhaust duct 13, and louver 14. In this configuration, the filter 20 and the intake grille 3 are removable for maintenance of the filter 20, the interior of the fuselage, the prefilter 6, and the counter electrode 5. The limit switch 19 is used for attaching and detaching these two removal members.
In order to prevent electric shock during maintenance as a safety mechanism with one point, it is necessary to satisfy the conditions in the following table.

[Table] Other accompanying conditions include the following. The intake grille 3 cannot be removed unless the filter 20 is removed. (Regulation of operating order so that only one limit switch is required) The filter 20 cannot be inserted without the intake grille 3. (Since the limit switch is activated by the filter, without this regulation, the power switch will turn on even when the intake grill is open, and high voltage will enter, creating a risk of electric shock.) Based on the above conditions, in the configuration of the present invention,
First, determine the conditions to be satisfied in the first table. Condition 1. Filter 20 “ON”, intake grill 3
If it is "ON", it is in normal use, and the filter 20 is completely inserted into the dust collector body, so the pusher 21 is pressed and the limit switch 19 is turned "ON" as shown in Fig. 8.
The discharge line 4 is in a state where a high voltage is supplied. Condition 2. Filter 20 “ON”, intake grill 3
In the case of “OFF”, this does not occur because the operation regulation is activated. That is, if there is no intake grille 3, the stopper 32 is biased by the stopper spring 34 to move the protrusion 35 into the filter accommodating portion 3 as shown in FIGS. 9 and 13.
6 and prevents the filter 20 from being inserted. At this time, if the recess 37 is formed, pull out the filter 20 a little as shown in FIG. 10, leave the buckle body 25 rotatable, remove the intake grille 3, and then return the filter 20 to its original position. Even if an attempt is made to insert the filter, the protrusion 35 of the stopper 32 will enter the recess 37 as shown in FIG.
stops at the position shown in Figure 11, and the limit switch 19 is not turned on, allowing more detailed safety to be ensured. Condition 3. Filter 20 “OFF”, intake grill 3
If it is "ON", the limit switch 19 will be "OFF" and there will be no problem. Condition 4. Filter 20 “OFF”, intake grill 3
In the case of "OFF", there is no problem because the limit switch 19 is "OFF" as described above. As described above, the biasing condition is also satisfied because of the stopper 32. Effects of the Invention As described above, the electrostatic precipitator of the present invention regulates the order of attachment and detachment of the removal member by particularly devising the positions of the stopper, filter, and limit switch. In addition to restricting the operation so that the intake grill cannot be removed unless it is moved to the position where it will be removed, a limit switch that turns the power on and off using a filter is installed according to the above conditions, and the limit switch is linked to all removal parts. Therefore, it is possible to eliminate the need to provide a plurality of corresponding limit switches. Therefore, not only the failure rate of parts and circuits and the ease of assembling wiring of limit switches are improved, but also the cost of parts and materials is greatly reduced, and safety can be sufficiently ensured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the electrostatic precipitator of the present invention, Fig. 2 is a sectional view of the same embodiment, Fig. 3 is a perspective view of the intake grille seen from inside, and Fig. 4 shows how the buckle works. Figure 5 is a cross-sectional view of the buckle with the intake grill and filter installed, Figure 5 is a cross-sectional view of the buckle body when the filter and intake grill are removed, Figures 6 and 7 are respectively
Figures and perspective views corresponding to Figures 5 and 8 to 1
Figure 1 shows the buckle body,
12 and 13 are perspective views of the stopper. 1...Front body, 2...Rear body, 3...
Intake grill, 4...Discharge wire, 5...Counter electrode, 6
... Prefilter, 9 ... Motor, 10 ... Fan, 15 ... High voltage unit, 19 ... Limit switch, 20 ... Filter, 21 ... Presser,
22... Filter frame, 25... Buckle body, 27...
Locking claw, 28... Locking portion, 30... Rotation stop projection,
31... Projection piece, 32... Stopper, 33...
Contactor, 34...stopper spring, 35...protrusion, 36...filter accommodating portion, 37...recess.

Claims (1)

[Claims for Utility Model Registration] 1. A dust collector body that is provided with an ionization section using a high voltage inside, and an intake grill and a filter that are detachably attached to the dust collector body, and the dust collector body is energized by the filter. A limit switch is provided with a pusher that turns on the power only when the filter is almost completely inserted into the dust collector body, and when the intake grille is not attached to the dust collector body, it is biased by a spring body and protrudes into the filter housing part. Prevents insertion and installation of filters,
When the intake grille is attached to the dust collector body, a stopper is provided to release the protrusion using a protrusion piece provided on the intake grille, and the intake grille is attached to the dust collector body using a buckle rotatably provided on the dust collector body. An electric dust collector configured such that when the filter is inserted into the dust collector main body, it comes into contact with the buckle body to prevent rotation. 2. The electrostatic precipitator according to claim 1 of the utility model registration claim, characterized in that the filter has a recess for receiving the protrusion of the stopper at or near the position where the filter is removed from the dust collector body until the limit switch is turned off. .