Anti-blocking device for dust collector

Abstract

The utility model discloses an anti-blocking device for a dust collector, which comprises a differential pressure sensor, a first collecting point of the differential pressure sensor is arranged at an air inlet of the dust collector, and a second collecting point of the differential pressure sensor is arranged at an air outlet of the dust collector; the PLC starting pulse controller comprises a timing starting module and a differential pressure starting module; the differential pressure starting module comprises a first comparator, the first signal input end of the first comparator is connected with the output end of a differential pressure sensor, the second signal input end of the first comparator is connected with reference voltage, and the output end of the first comparator is connected with the input end of a pulse valve switch. When the voltage output by the differential pressure sensor is larger than the reference voltage, the first comparator outputs a high level, and the pulse valve is started.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust collecting box technical field, concretely relates to a prevent stifled device for dust collector. BACKGROUND

[0002] Silane tail gas and a small amount of other tail gas are produced in the process of photovoltaic equipment production, the commonly used method for processing silane tail gas is to pass in N2 and CDA to make silane self-ignition, and after combustion, silicon dioxide and water vapor are produced, wherein the silicon dioxide is a solid substance and needs to be filtered and treated through a dust collector.

[0003] The main working principle of the dust collector is that after dust-containing gas is passed into the dust collector, the dust with large and heavy particles is settled down due to gravity, and the fine dust is intercepted when passing through the filter bag, and with the accumulation of the dust on the surface of the filter bag, the opening and closing of the pulse valve are controlled by the pulse controller or PLC, compressed air is sprayed into the dust collecting bag, so that the bag instantaneously expands and shakes off the dust, thereby removing the dust on the filter bag and realizing the purification of the gas.

[0004] Due to the limitation of the bearing capacity of the filter bag, when processing dust with different components, if the parameter control adjustment cannot be performed in time, problems such as filter bag sticking, blocking and bag burning may occur, which affects the dust collecting effect and the service life of the filter bag. INVENTION CONTENTS

[0005] Therefore, the utility model embodiment provides a prevent stifled device for dust collector to solve the problem that the filter bag is easy to stick, block and burn when the dust collector processes dust with different components by using default parameter control, which affects the dust collecting effect and the service life of the filter bag.

[0006] The utility model embodiment provides a prevent stifled device for dust collector, which comprises:

[0007] The first collection point of the differential pressure sensor is arranged at the air inlet of the dust collector, and the second collection point is arranged at the air outlet of the dust collector.

[0008] The PLC starts the pulse controller, which comprises a timing starting module and a differential pressure starting module; wherein the differential pressure starting module comprises a first comparator, the first signal input end of the first comparator is connected with the output end of the differential pressure sensor, the second signal input end of the first comparator is connected with the first reference voltage, and the output end of the first comparator is connected with the pulse valve switch input end; when the voltage output by the differential pressure sensor is greater than the first reference voltage, the comparator outputs high level, and the pulse valve is started.

[0009] Optionally, the differential pressure starting module comprises a second comparator, a first signal input end of the second comparator is connected with an output end of the differential pressure sensor, a second signal input end of the second comparator is connected with a second reference voltage, and an output end of the second comparator is connected with a pulse valve switch input end; when the voltage output by the differential pressure sensor is less than the second reference voltage, the comparator outputs a low level to close the pulse valve.

[0010] Optionally, sampling holes are arranged at the air inlet and the air outlet of the dust collector, and the two sampling probes of the differential pressure sensor are arranged at the air inlet and the air outlet of the dust collector through the two sampling holes respectively.

[0011] Optionally, the pulse width of the PLC starting pulse controller is set to 100 milliseconds.

[0012] Optionally, the dust cleaning period of the timing starting module of the PLC starting pulse controller is set to 60 seconds.

[0013] Optionally, the differential pressure starting module of the PLC starting pulse controller is configured such that the first reference voltage corresponds to an atmospheric pressure of 1000 Pa, and the second reference voltage corresponds to an atmospheric pressure of 800 Pa.

[0014] Optionally, the sampling holes are threaded holes, and the sampling probes of the differential pressure sensor extend into the air inlet and the air outlet of the dust collector through the hollow threaded holes.

[0015] Optionally, the PLC starting pulse controller further comprises an alarm module, and the alarm module is configured to send an alarm signal when the voltage output by the differential pressure sensor is still greater than the reference voltage after the differential pressure starting module performs the dust cleaning operation for at least three times.

[0016] The utility model discloses the beneficial effect:

[0017] The utility model discloses an anti -blocking device for dust collector, the filter bag in the dust collector adsorbs dust, and the time interval of dust cleaning is set through the pulse controller, and periodic dust cleaning is carried out. During the period, the pressure difference of dust collector import and export is detected through the differential pressure sensor, and whether the filter bag is blocked is judged, when the value measured by the differential pressure sensor exceeds 1000Pa, then the filter bag is judged to be blocked, and the pulse valve is opened under the control of the PLC control starting pulse instrument, and dust cleaning starts, avoids until the dust is spouted from the chimney, and then the filter bag in the dust collector is blocked, and the service life of the filter bag is affected. In addition, if the value measured by the differential pressure sensor still exceeds 1000Pa after the differential pressure starting module performs the dust cleaning operation for at least three times, then the alarm module sends an alarm, and notifies the staff on site to troubleshoot. BRIEF DESCRIPTION OF DRAWINGS

[0018] The features and advantages of the present application will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, which are given by way of illustration and are not intended to be limiting of the present application, and in which:

[0019] Figure 1 A structure diagram of the anti-blocking device for the dust collector according to an embodiment of the present application is shown;

[0020] Figure 2 A circuit block diagram of the differential pressure starting module for the PLC starting pulse control of the dust collector according to an embodiment of the present application is shown;

[0021] Figure 3 A logic diagram of the PLC starting pulse control for the dust collector according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0023] As shown in Figure 1 the present application provides an anti-blocking device for a dust collector, comprising a differential pressure sensor and a PLC starting pulse controller, wherein the first collection point 1 of the differential pressure sensor is arranged at the air inlet of the dust collector, and the second collection point 2 is arranged at the air outlet of the dust collector. The PLC starting pulse controller comprises a timing starting module and a differential pressure starting module. As shown in Figure 2 the differential pressure starting module comprises a first comparator, the first signal input end of the first comparator is connected with the output end of the differential pressure sensor, the second signal input end of the first comparator is connected with the first reference voltage, and the output end of the first comparator is connected with the pulse valve switch input end; when the voltage output by the differential pressure sensor is greater than the first reference voltage, the first comparator outputs a high level to start the pulse valve.

[0024] The anti-blocking device provided by the embodiment is mainly applied to a cloth bag type dust collector. When dust-containing gas enters the cloth bag dust collector, dust with large particles and large specific gravity is settled down under the action of gravity. When the particle diameter of the dust is larger than the gap between the filter material fibers or the gap between the dust on the filter bag, the dust is blocked when the airflow passes through. When the amount of dust accumulated on the filter bag increases, this effect is more significant. When the airflow passes through the filter bag, it can pass around the fibers, while larger dust particles still move in the original direction under the action of inertial force, and then collide with the filter bag to be captured. The light and small dust moves with the airflow, very close to the airflow streamline, and can pass around the fibers. However, after being collided by the gas molecules in thermal motion (i.e., Brownian motion), the dust changes the original motion direction, which increases the contact opportunity between the dust and the fibers, so that the dust can be captured. The thinner the diameter of the filter bag fibers and the smaller the porosity, the higher the capture rate, so it is more conducive to dust removal. When the dust adsorbed on the surface of the filter bag reaches a certain degree, the pulse impact energy generated by the instantaneous release of high-pressure gas is used to strip the dust particles adsorbed on the surface of the filter bag and make them settle in the dust collection box. As shown in Figure 1 The dust-containing exhaust gas enters the dust collection box from the lower air inlet. The dust collection box is usually a spiral upward air duct. The filtered gas is discharged from the upper air outlet after passing through the upper filter bags 3. When the filter bag 3 adsorbs a certain amount of dust, the pulse device 4 is started to release a pulse impact on the filter bag to shake off the dust on the surface of the filter bag, and the dust falls into the ash hopper below.

[0025] In the embodiment, the pulse width of the PLC start pulse controller is set to 100 milliseconds, and the dust removal cycle of the timing start module of the PLC start pulse controller is set to 60 seconds.

[0026] As an optional implementation, the differential pressure start module includes a second comparator. The first signal input end of the second comparator is connected with the output end of the differential pressure sensor, the second signal input end of the second comparator is connected with the second reference voltage, and the output end of the second comparator is connected with the pulse valve switch input end. When the voltage output by the differential pressure sensor is less than the second reference voltage, the comparator outputs a low level to close the pulse valve.

[0027] The differential pressure start module of the PLC start pulse controller is configured such that the first reference voltage corresponds to an atmospheric pressure of 1000 Pa, and the second reference voltage corresponds to an atmospheric pressure of 800 Pa. When the pressure difference between the air inlet and the air outlet is greater than 1000 Pa, the pulse valve is opened, and compressed air rushes into the filter bag through the induction nozzle in a very short time, so that the filter bag is deformed and vibrates, and the dust attached to the outer surface of the filter bag is stripped and falls into the ash hopper under the action of the reverse airflow. When the pressure difference between the air inlet and the air outlet is less than 800 Pa, the pulse valve is closed, and the timing dust removal mode is re-entered.

[0028] In specific embodiments, the ash cleaning period of the differential pressure starting module can be set to be consistent with the ash cleaning period of the timing starting mode, or set to be 10-50 seconds according to actual needs, to accelerate the dust peeling of the surface of the filter bag.

[0029] As an optional implementation, sampling holes are respectively arranged at the air inlet and the air outlet of the dust collector, and the two sampling probes of the differential pressure sensor are respectively arranged at the air inlet and the air outlet of the dust collector through the two sampling holes, and the sampling holes are sealed after installation.

[0030] As an optional implementation, the sampling holes are threaded holes, and the sampling probes of the differential pressure sensor extend into the air inlet and the air outlet of the dust collector through the hollow threaded holes.

[0031] As an optional implementation, the PLC starting pulse controller further comprises an alarm module, and the alarm module is configured to output an alarm signal when the voltage output by the differential pressure sensor is still greater than the reference voltage after the differential pressure starting module performs ash cleaning operation for at least three times.

[0032] In the embodiment, the trigger condition of the alarm module can be set to output an alarm signal when the voltage output by the differential pressure sensor is still greater than the reference voltage after 3 minutes or 5 minutes after the differential pressure starting module performs the first ash cleaning operation.

[0033] The exhaust gas is sent to the inside of the dust collector through the air pipe, the dust is adsorbed by the filter bag, the time interval of ash cleaning is set by the pulse controller, and the ash is cleaned once when the time is up. At the same time, the differential pressure between the inlet and the outlet of the dust collector is detected by the differential pressure sensor to determine whether the filter bag is blocked, and when the value measured by the differential pressure sensor exceeds 1000 Pa, the pulse valve is opened by the PLC starting pulse controller to start ash cleaning. If the differential pressure value still exceeds 1000 Pa after the above processing measures are completed, the PLC outputs an alarm signal, and the on-site troubleshooting is performed.

[0034] It should be noted that the modules, comparators and controllers involved in the patent scheme are all conventional inherent functions, and the patent is based on the improvement of system composition and connection structure, and not the improvement of the control process.

[0035] The utility model embodiment provides a kind of for dust collector's anti-blocking device, filter bag adsorbs dust inside dust collector, carry out periodic dust cleaning by the time interval of ash removal that pulse controller sets. During, the pressure difference of dust collector import and export is detected by differential pressure sensor, judge whether filter bag is blocked, when the value measured by pressure difference sensor exceeds 1000Pa, then judge that filter bag is blocked, PLC control starts pulse controller and controls pulse valve to open, start ash removal, avoid until dust is ejected from chimney mouth to discover that filter bag inside dust collector is blocked, affect dust collection effect and filter bag's service life. Besides, suppose that differential pressure starts module after executing at least three times ash removal operation, the value measured by differential pressure sensor still exceeds 1000Pa, then alarm module issues alarm, informs staff on-site troubleshooting.

[0036] The above control process and judgment logic are only for better understanding the execution process of the present patent scheme, and are not within the protection scope of the present patent, and the execution process of the present patent can be completed by only using conventional functions such as modules, comparators and controllers for initial setting, and the present patent protects the entire system configuration, which belongs to the protection object of the utility model patent.

[0037] Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A clogging prevention device for a dust collector, characterized by comprising: The differential pressure sensor has a first sampling point arranged at an air inlet of the dust collector and a second sampling point arranged at an air outlet of the dust collector. The PLC starting pulse controller comprises a timing starting module and a differential pressure starting module; the differential pressure starting module comprises a first comparator, a first signal input end of the first comparator is connected with an output end of the differential pressure sensor, a second signal input end of the first comparator is connected with a first reference voltage, and an output end of the first comparator is connected with a pulse valve switch input end. When the voltage output by the differential pressure sensor is greater than the first reference voltage, the comparator outputs a high level to start the pulse valve. The differential pressure starting module comprises a second comparator, a first signal input end of the second comparator is connected with an output end of the differential pressure sensor, a second signal input end of the second comparator is connected with a second reference voltage, and an output end of the second comparator is connected with a pulse valve switch input end.

2. The clogging prevention device for a dust collector according to claim 1, characterized by When the voltage output by the differential pressure sensor is less than the second reference voltage, the comparator outputs a low level to close the pulse valve. Sampling holes are arranged at the air inlet and the air outlet of the dust collector, and two sampling probes of the differential pressure sensor are arranged at the air inlet and the air outlet of the dust collector through the sampling holes.

3. The anti-clogging device for a dust collector according to claim 1, wherein The pulse width of the PLC starting pulse controller is set to 100 milliseconds.

4. The clogging prevention device for a dust collector according to claim 1, wherein The dust cleaning period of the timing starting module of the PLC starting pulse controller is set to 60 seconds.

5. The anti-clogging device for a dust collector according to claim 4, wherein The differential pressure starting module of the PLC starting pulse controller is configured such that the first reference voltage corresponds to an atmospheric pressure of 1000 Pa, and the second reference voltage corresponds to an atmospheric pressure of 800 Pa.

6. The anti-clogging device for a dust collector according to claim 2, wherein The sampling holes are threaded holes, and the sampling probes of the differential pressure sensor extend into the air inlet and the air outlet of the dust collector through the hollow threaded holes.

7. The anti-clogging device for a dust collector according to claim 3, wherein The PLC starting pulse controller further comprises an alarm module; the alarm module is configured to output an alarm signal when the voltage output by the differential pressure sensor is still greater than the reference voltage after the differential pressure starting module performs at least three dust cleaning operations.

8. The clogging prevention device for a dust collector according to claim 1, wherein ​

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