JPS6335780Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dust collecting bag filter.

There is a conventional bag filter for dust collection as shown in FIG. 1. The bag filter shown in the figure is equipped with a horizontal U-shaped cloth support frame, and has horizontal U-shaped upper and lower arm parts 1a, arm ends 1b of 1a, An elongated rectangular pressing plate 2 is fixed to 1b, and a vertically long clean air vent 3 is opened in this pressing plate 2, and the upper and lower arm parts 1a, 1a
As shown in FIG. 2, upper and lower spring support rods 4, 4 are respectively fixed to the upper and lower spring support rods, and each of these support rods is provided with a plurality of spring hook holes 5, 5 spaced apart from each other in the length direction of the support rods. , the upper and lower ends of the coil springs 6 are hooked to the upper and lower pairs of spring hook holes 5, 5, respectively, and the plurality of springs 6 are installed in an elastically stretched state between the upper and lower support rods 4, 4. Spring 6
A cloth bag body 7 is placed over the horizontal U-shaped frame 1 to which the filter is attached, and a flat filter body is inserted into the mounting hole of a partition plate 10 that partitions a clean air chamber 8 and a dust-containing air chamber 9, as shown in FIG. When inserted and attached to the dust collector main body, the open end 7a of the bag 7 is pressed against the partition plate 10 by the pressing plate 2, and is sandwiched between the two plates 2 and 10, thereby sealingly fixing it. It is configured like this.

As mentioned above, the flat plate type overbody has a structure in which a large number of coil springs 6 are installed inside in a stretched state to support the cloth bag body 7, so that the cloth members located on both sides of the cloth bag body 7 This prevents excess area from being lost due to contact with each other, and prevents the fluttering movement of the cloth due to intermittent positive and negative pressure during cloth washing, or the sudden movement of the cloth during atmospheric suction cleaning. When applied to a coil spring, the complex movement of the spring can be used to synergistically promote the effect of removing dust attached to cloth, and for this reason, coil springs are not suitable for use in applications that absorb vibrations. Instead, it is used to amplify the vibration, and the multiple springs each move separately to enable effective brushing off.

However, the conventional spring was a normal helical spring with both ends at right angles as shown in FIG. 4, but this was inconvenient because the cloth would quickly wear out due to the impact during cleaning. To explain the cause of fraying using Fig. 5, for manufacturing and installation of the spring, the minimum length is required to be l, which is longer than the spring pitch S, so for example, if l = 3S, then Since the force of the cloth acting on the helical 6a is three times the force acting on the helical 6b, there was a problem that the cloth in this part wore out faster than in other parts.

The present invention was developed in view of the above-mentioned problems.The end of the coil spring in the part where the cloth flaps is made into a conical shape, the helical diameter is made smaller than the main part of the spring, and the helical pitch is made smaller. The purpose is to reduce the pressure per unit area of cloth exerted by the spring, thereby preventing the cloth from fraying.

For this reason, the dust collecting bubble filter according to the present invention is characterized in that the end portion of the coil spring located at least in the part where the cloth flaps is made into a conical shape, the helical diameter is made small, and the pitch is made small. .

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 6 shows one embodiment of the present invention, and the illustrated example shows a horizontal U-shaped bottom portion 1c of a horizontal U-shaped support frame 1 made of a tube material, etc., and a horizontal U-shaped upper and lower arm portion 1a, 1a.
A pressing plate side spring support rod 16 is fixed in parallel to the pressing plate 2 between the upper and lower arm ends at a position adjacent to the pressing plate 2 with clean air vents fixed to the arm ends 1b, 1b, and both spring supporting rods are attached. Spring hooking holes 17, 17 are provided in the spring hooking holes 15, 16 at appropriate intervals in the length direction, and the left and right ends of the coil spring 18 are hooked into the opposing spring hooking holes 17, 17, respectively. Support frame bottom 1c
A plurality of coil springs 1 are installed between the
8 are stretched, thereby arranging them parallel to the main direction A of the internal clean air flow.

As shown in FIG. 7, the coil spring 18 is
One end 18a or both ends 18a and 18
b has a conical shape over a length of about 50 to 100 mm to make the helical pitch smaller than the main part, thereby reducing the pressure per unit area of the cloth applied by the coil spring 18, so that the end portion of the coil spring 18 is This is to reduce the amount of fabric fraying due to corners.

In the above-described example shown in FIG. 6, the coil spring end 18c on the clean air outlet side of the cloth has the terminal shape of a normal helical spring, as shown in FIG. The reason for this is that the vicinity of the clean air outlet side is a part where no flapping motion or impact occurs when washing the cloth.
This is because the cloth will not be worn out by the corner of the end of the spring 18. On the other hand, the bottom part of the frame 1 on the opposite side, where the cloth undergoes a lot of flapping movement.
On the c side, the coil spring end 18a has a conical shape as shown in FIG.

The effect of the present invention by making the end of the coil spring 18 into a conical shape as described above will be explained with reference to FIG. 10. When two springs are used, as shown in FIG. 10c. Calculate the area connecting the contact points of the cloth and the spring.
When A ₁ and A ₂ are used, the force with which the cloth collides with the spring is P ₁ and P ₂ respectively. P ₂ = A ₂ = b x l x ρ ρ: Pressure per unit area P ₁ = A ₁ = b x S ×ρ, so A ₂ /A ₁ =P ₂ /P ₁ =b×l×ρ/b×S×ρ=l/S Since we assumed l=3S, l/S=3S/S=3/1 Therefore, the force of the cloth acting on Figure 10a is as shown in Figure 10b.
This is three times the force acting on the figure.

For example, when comparing Figures 10a and 10b, it can be seen that within the distance S in Figure 10a, there is only one contact point with the cloth on one side, so the impact of the cloth is received at one point. However, in the case of Figure 10b, there are three contact points with the cloth within the same distance S, and the impact of the cloth is distributed to three points,
This is an idea that takes into consideration that the pitch becomes finer when the coil diameter is made smaller with wire of the same thickness, and the force applied to the cloth surface is averaged, thereby preventing the cloth from fraying. This has the effect of being able to.

[Brief explanation of the drawing]

Fig. 1 is a diagrammatic perspective view showing a conventional bag filter with a part of the cloth bag body broken and removed; Fig. 2 is an enlarged partial perspective view of the coil spring attachment part of the bag filter shown in Fig. 1; The diagram is B-B in Figure 1.
An explanatory schematic diagram shown as a cross section on a horizontal plane passing through the line,
Fig. 4 is a front view of a coil spring used in a conventional bag filter, Fig. 5 is a schematic diagram for explaining the operation of the end of the coil spring, and Fig. 6 is a cloth bag body of a dust collecting bag filter according to the present invention. FIG. 7 is a front view of the coil spring according to the present invention, and FIG.
Partial perspective view showing the detailed structure of part D in the figure, No. 9
This figure is a partial perspective view showing the detailed structure of the part E in FIG. 6, and FIG. 10 is an explanatory view of the action of the coil spring. 1...U-shaped frame, 2...pressing plate, 3...
Clean air vent, 15, 16...Spring support rod, 18...Coil spring, 18a, 18b
...Conical shaped end.

Claims (1)

[Scope of utility model registration request] A dust collector comprising a U-shaped frame, a plurality of coil springs attached to the U-shaped frame, and a cloth bag body placed over the U-shaped frame, and having a clean air vent on the arm end side of the U-shaped frame. 1. A bag filter for collecting dust, characterized in that the end portion of the coil spring located at least in the part where the cloth flaps is formed into a conical shape, the helical diameter is made small, and the pitch is made small.