Retainer cone, and bag filter retainer having the same

Abstract

Intended is to provide a retainer cone, which is inserted into the center of the upper end portion of a retainer body, which is a negative pressure generating region near the mounting position of a conventional Venturi tube, to disperse a portion of such compressed air radially of the retainer body as is injected from a nozzle at the upper portion of the retainer body at the time of back-washing a filter fabric, so that it can prevent a negative pressure from being generated on the upper end side of the retainer body, which bulges the entire filter fabric containing the upper end side of the retainer body outward so that it can reliably wipe off powder dust having stuck to the filter fabric, and which makes the sectional area of the passage of the retainer body upper end portion larger than that of the conventional Venturi type so that it can drastically reduce the load on a blower to be used for suctions at the dust collecting time. The retainer cone is inserted into and arranged at the central portion on the upper end side of the retainer body for a bug filter retainer, and includes a radially reduced upper end portion so formed at the upper end portion of the longitudinal direction as is radially reduced toward the upper end, and a radially reduced lower end portion so formed at the lower end portion of the longitudinal direction as is radially reduced toward the lower end.

Description

technical field [0001] The present invention relates to a holder cone for a bag filter provided on a holder for a bag filter, and a holder for a bag filter having the cone for the holder, the holder for a bag filter supporting a filter cloth of a dust collector from the inside. Background technique [0002] At present, dust collectors use a device that has a filter cloth (filter bag) and a support frame (hereinafter referred to as the holder body) that allows the dust-laden air to pass through, separates and captures dust, and the support frame maintains the shape of the filter cloth. And support the filter cloth from the inside. Once the dust collector is operated, the filter cloth collects the dust, and the loss of suction force increases with the passage of the operation time, so it is necessary to intermittently or continuously shake off the collected dust. As a dust collector having such a dusting mechanism, there are pulse-jet dust collectors described in Patent Docum...

AI Technical Summary

Problems solved by technology

[0010] (1) Even if the pulse jet (compressed air) of positive pressure is injected, due to its fast injection speed (about 90m / s), the positive pressure is only generated for a moment (during about 0.02 seconds) (refer to Figure 8 (a), ( b)), the filter cloth 55 cannot react, and at the upper end of the filter cloth 55, the positive pressure in the filter cloth 55 generated by the pulse jet and the suction negative pressure of the blower on the top of the dividing plate (mesh plate) 60 are generated When the pressure is pulled, the inside of the filter cloth 55 is in a vacuum state. Since the filter cloth 55 is strongly attracted to the side of the holder body 51 and does not stick to it, the dust cannot be shaken off at the upper end of the filter cloth 55, and the dust collection efficiency is improved. reduce

[0011] (2) By passing high-speed pulsed air (compressed air) through the Venturi tube 52, the internal pressure of the holder body 51 is reduced, and the dust-laden airflow outside the bag filter holder 50 passes through the filter cloth 55 and is sucked into the holder body. 51, but due to the resistance of the filter cloth 55, the dusty airflow cannot pass through the filter cloth 55 in a short time, and it is too late to supply clean airflow to the inside of the holder body 51 and generate negative pressure

The filter cloth 55 is in a suction state in which the negative pressure formed by the negative pressure and the suction of the blower are strongly attracted to the outer periphery of the retainer body 51 and does not move. The filter cloth 55 rubs against the retainer body 51 and is easily damaged, reducing the service life.

[0012] (3) In particular, from the upper end of the filter cloth 55, at the junction position where the negative pressure changes from 500 mm to 600 mm to the positive pressure, the damage caused by excessive pulling and bending of the filter cloth 55 inwards and outwards is obvious

[0013] (4) When the pressure of the pulse jet is increased or when the Venturi tube 52 is removed, or when the Venturi tube 52 is installed so that it protrudes to the outside of the holder body 51, the upper end of the filter cloth 55 The negative pressure increases further, and the filter cloth 55 is easily damaged

Therefore, the pressure of the pulse jet is usually in the range of about 196kPa to 686kPa, but in order to prevent damage to the filter cloth 55, the pressure of the pulse jet may be controlled to be 392kPa or less for use. , the pulse jet cannot reach the lower end of the holder body 51, and the dust cannot be dusted off at the upper and lower ends

[0014] (5) Since the Venturi tube 52 is provided inside the retainer body 51, the cross-sectional area of ​​the flow path at the upper end of the retainer body 51 is reduced, the flow velocity of the clean air flow is increased when the blower is sucking, and the pressure loss is increased.

And, because the flange 52a of Venturi pipe 52 upper ends, there is not the discharge channel of clean airflow on the periphery of Venturi pipe 52, and clean airflow stagnates, and suction efficiency reduces

[0015] (6) When a plurality of openings (exclusive holes for blower suction) are provided on the circumference of the flange 52a at the upper part of the Venturi tube 52 to enlarge the opening area, the load on the blower during dust collection can be reduced and the suction force can be increased. , but when the dust is dusted off and the pulse jet is jetted, the pressure generated between the positive pressure in the filter cloth 55 generated by the pulse jet and the suction negative pressure of the blower on the top of the partition (mesh plate) 60 is strengthened, The negative pressure at the upper end of the filter cloth 55 increases, and at the same time, the positive pressure of the pulse jet cannot reach the lower end of the holder body 51, and the effect of dusting off the dust is insufficient.

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