Voltage stabilizing device for bag filter

Abstract

The present invention discloses a pressure stabilizing device for a bag dust collector, comprising: an air source; an adjusting mechanism, wherein the air source, the adjusting mechanism and a target position form a connectable air path, wherein the target position is a bag dust collector or a main pipeline connected to the bag dust collector and the front end; a master controller, wherein the master controller controls the opening and closing and / or parameter adjustment of the adjusting mechanism, and the master controller monitors the pressure fluctuation of the main pipeline connected to the bag dust collector and the front end. The present invention can make the pressure fluctuation in the bag dust collector meet the requirements, meet the process negative pressure fluctuation range required by precision production such as vapor deposition, and has a good effect on improving the production quality of high value-added products such as lasers and optical fiber preforms.

Description

Technical Field

[0001] The invention relates to a voltage stabilizing device for a bag dust collector. Background Art

[0002] In the production of fine chemicals such as quartz and optical fiber preform vapor deposition, bag dust collectors are needed to treat waste gas. Fine chemical production such as quartz and optical fiber preform vapor deposition produces dusty waste gas, which needs to be discharged to the bag dust collector at the tail end through negative pressure suction for treatment. The negative pressure environment required for fine chemical production such as quartz and optical fiber preform vapor deposition requires extremely low negative pressure fluctuations. Figure 1 As shown in the figure, after the bag filter has been running for a period of time, the dust on the outer surface of the bag is continuously enriched, and the bag filter needs to be pulse cleaned at this time. However, during pulse cleaning, the negative pressure of the front-end process will fluctuate greatly. However, fine chemical production processes such as quartz and optical fiber preform vapor deposition have strict requirements on the process pressure fluctuation range, which is usually as low as ±10Pa. This contradiction cannot be solved by static pressure box alone. Therefore, it is necessary to solve the problem of large fluctuation of the negative pressure of the front-end process during pulse cleaning of bag filter. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a voltage stabilizing device for a bag dust collector.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A voltage stabilization method for a bag dust collector is provided. Before each pulse cleaning, gas is added to the bag dust collector or a main pipeline connected to the bag dust collector and the front end. The gas addition process lasts for a period of time.

[0006] According to one embodiment of the present invention, the molar amount V of the supplementary gas 1 The gas molar volume V of this pulse cleaning 2 Between V 1 =95%V 2 ~105%V 2 .

[0007] According to one embodiment of the present invention, the pulse cleaning start time is t 1 , pulse cleaning duration is Δt 1 ; The start time of gas replenishment is t 0 , the duration of gas replenishment is Δt 0 ; Among them, the start time of gas replenishment is t 0 At the pulse cleaning start time t 1 Before, the duration of the supplementary gas is Δt 0 >Pulse cleaning duration Δt1 .

[0008] According to one embodiment of the present invention, the supplementary gas duration Δt 0 And pulse cleaning duration Δt 1 Satisfy Δt between 0 =5Δt 1 ~20Δt 1 .

[0009] According to one embodiment of the present invention, the pulse valve cleaning end time is t 3 , the air supply closing time is t 2 , t 2 =t 1 +kΔt 1 or 2 =t 3 -(1-k)Δt 1 , k is between 0.4 and 0.6.

[0010] According to one embodiment of the present invention, the air supply closing time t 2 The pulse cleaning start time t 1 at the same time.

[0011] According to one embodiment of the present invention, the pressure P of the supplementary gas 0 The pressure P in the main pipe connected to the bag filter or the bag filter and the front end 1 Meet 0.95P 1 <P 0 <1.05P 1 .

[0012] A voltage stabilizing device for a bag dust collector, comprising:

[0013] A gas source, for providing supplementary gas;

[0014] The regulating mechanism, the air source, the regulating mechanism and the target position form a communicable air path, and the target position is the bag dust collector or the main pipeline connecting the bag dust collector and the front end.

[0015] According to one embodiment of the present invention, it also includes a main controller, which controls the opening and closing of the regulating mechanism and / or the parameter adjustment, and monitors the pressure fluctuation of the main pipeline connected to the front end of the bag filter.

[0016] According to one embodiment of the present invention, the gas source includes an air bag, which is used to provide gas for pulse cleaning and supplementary gas before pulse cleaning.

[0017] According to one embodiment of the present invention, the regulating mechanism comprises: an opening and closing and regulating device, both ends of which are respectively connected to the gas source and the target position, and the main controller controls the opening and closing and regulating device.

[0018] According to one embodiment of the present invention, the regulating mechanism further comprises a first regulating device, the first regulating device and the opening and closing regulating device are combined and connected to form an air path, and the two ends of the air path are respectively arranged to be connectable to the air source and the target position.

[0019] According to one embodiment of the present invention, the regulating mechanism further comprises a second regulating device, and the opening and closing regulating device, the first regulating device and the second regulating device are combined and connected to form an air path, and the two ends of the air path are respectively arranged to be connectable with the air source and the target position.

[0020] According to one embodiment of the present invention, the opening, closing and regulating device includes a first pressure regulating valve, a sequence valve and a switch valve, the first regulating device includes a flow regulating valve, the first pressure regulating valve, the flow regulating valve, the sequence valve and the switch valve are combined and connected to form an air circuit, the two ends of the air circuit are respectively connected to the air source and the second regulating device, the second regulating device is connected to the target position, the opening pressure of the sequence valve is equal to the set outlet pressure of the first pressure regulating valve, the main controller controls the opening and closing of the switch valve, the main controller controls the flow regulating valve, and the second regulating device is used to adjust the air pressure.

[0021] According to one embodiment of the present invention, the second regulating device includes a first gas expansion tank and a second gas expansion tank, a first pressure regulating valve, a flow regulating valve, a sequence valve and a switch valve are connected in sequence, one end of the first pressure regulating valve is arranged to be communicable with a gas source, and the other end is connected to the flow regulating valve, the first gas expansion tank and the second gas expansion tank are arranged to be communicable, the inlet of the first gas expansion tank is connected to the outlet of the switch valve, and the outlet of the second gas expansion tank is communicated with the target position.

[0022] According to one embodiment of the present invention, a hand valve is further included, and two ends of the hand valve are respectively connected to the first pressure regulating valve and the gas source.

[0023] According to one embodiment of the present invention, the regulating mechanism includes an opening and closing device and a first regulating device, the air source is an independent air source, and the two ends of the air path formed by the opening and closing device and the first regulating device are respectively arranged to be connectable with the independent air source and the target position, and the main controller controls the opening and closing device and / or the first regulating device.

[0024] According to one embodiment of the present invention, the opening and closing device includes a switch valve, the first regulating device includes a flow regulating valve and a second pressure regulating valve, the switch valve, the second pressure regulating valve and the flow regulating valve are combined and connected to each other to form an air circuit, and the two ends of the air circuit are respectively connected to independent air sources and target positions, the main controller controls the opening and closing of the switch valve, and the main controller controls the flow regulating valve.

[0025] According to one embodiment of the present invention, it further comprises a second adjusting mechanism, and two ends of the second adjusting mechanism are respectively arranged to be communicable with the first adjusting device and the target position.

[0026] According to one embodiment of the present invention, the second regulating mechanism includes a first gas expansion tank and a second gas expansion tank, a second pressure regulating valve, a flow regulating valve and a switch valve are connected in sequence, one end of the second pressure regulating valve is arranged to be communicable with an independent gas source, and the other end is connected to the flow regulating valve, the first gas expansion tank and the second gas expansion tank are arranged to be communicable, the inlet of the first gas expansion tank is connected to the outlet of the switch valve, and the outlet of the second gas expansion tank is communicated with the target position.

[0027] According to one embodiment of the present invention, the first gas expansion tank and the second gas expansion tank are both empty boxes, and the first gas expansion tank and the second gas expansion tank are connectably arranged through a gas circuit switch, and the gas circuit switch includes a gas circuit one-way valve, and the connection direction of the gas circuit one-way valve is from the first gas expansion tank to the second gas expansion tank.

[0028] According to one embodiment of the present invention, it also includes a flow monitor and a pressure monitor, which are respectively arranged on the air path between the air source, the regulating mechanism and the target position. The main controller controls the opening and closing of the switch valve and / or the flow regulating valve according to the data of the flow monitor and the pressure monitor.

[0029] According to one embodiment of the present invention, it also includes two quick exhaust valves and an electromagnetic reversing valve, the switch valve is a pneumatic butterfly valve, the electromagnetic reversing valve controls the reversing of the cylinder of the pneumatic butterfly valve, a quick exhaust valve is respectively connected between the two cavities of the cylinder of the pneumatic butterfly valve and the electromagnetic reversing valve, and the main controller controls the electromagnetic reversing valve.

[0030] According to one embodiment of the present invention, a hand valve is further included, and two ends of the hand valve are respectively connected to the second pressure regulating valve and the independent gas source.

[0031] According to one embodiment of the present invention, a shock wave deflection structure is further included, which is arranged in a part of the main pipeline, and the shock wave deflection structure divides the radial cross section of the main pipeline into two spaced parts, and the shock wave deflection structure has two ends, namely a first end and a second end, and the width and / or height of the first end is greater than the width and / or height of the second end, and the position of the first end is closer to the bag filter than the position of the second end. The shock wave deflection structure is arranged in a part of the main pipeline.

[0032] According to an embodiment of the present invention, the shock wave redirection structure divides the radial cross section of the main pipeline into two left and right parts.

[0033] According to one embodiment of the present invention, it also includes a pressure-relieving membrane, and a plurality of openings are provided on the wall of the main pipeline, and the openings are covered with the pressure-relieving membrane.

[0034] According to one embodiment of the present invention, the total axial length of the shock wave redirection structure and / or the pressure relief membrane is greater than or equal to 1.1 m.

[0035] The present invention introduces supplementary gas into the bag filter or the main pipeline connecting the bag filter and the front end in advance, cuts off the supplementary gas before the pulse, and keeps the gas volume in the bag filter and the main pipeline stable. As the supplementary gas undergoes decompression and expansion, the adiabatic compression becomes isothermal compression, and the PV λ = constant becomes PV = constant, λ is the adiabatic index, and for air, λ is 1.4, that is, the magnitude of the change in volume changes from the original exponential level to the current 1, which greatly reduces the impact of the increase in volume on the pressure. In this way, it is possible to avoid the instantaneous compression of the original gas in the bag filter and the main pipeline due to the instantaneous increase in the cleaning gas during pulse cleaning, which can greatly reduce the pressure fluctuations caused by the increase in gas volume at the front end. At the same time, during pulse cleaning, the pulse duration is very short, and the supplementary gas is added in advance, and the duration of the supplementary gas is 5 to 20 times longer than the pulse duration. In general, the pressure fluctuation can be reduced to within the requirement of ±10Pa.

[0036] The present invention can make the pressure fluctuation in the bag filter meet the requirements and satisfy the process negative pressure fluctuation range required by precision production such as vapor deposition, and has a good effect on improving the production quality of high value-added products such as lasers and optical fiber preforms.

[0037] One of the schemes of the present invention is to set a sequence valve, and use the air pressure drop of the air bag during pulse cleaning to close the sequence valve, so that the start of pulse cleaning is synchronized with the closing action of the sequence valve; set a switch valve, first, it can control the opening time of the switch valve, so that when the air bag pressure reaches the opening pressure of the sequence valve, the start of supplementary gas can be controlled at any time, so that the opening time of supplementary gas can be controlled; second, avoid erroneous operation caused by failure of the sequence valve; in this scheme, the air source is the air bag, so no other air supply source is needed. In another scheme, since an independent air source is used, the switch control is relatively simple. Two schemes can be selected according to actual needs. The present invention sets a quick exhaust valve to reduce the cylinder reaction lag time of the pneumatic butterfly valve; in order to reduce the error in actual application, a shock wave deflection structure is set, so that the shock wave is dispersed radially to the main pipeline, and after changing direction, it can be mutually reduced; the outer wall of the pipeline is also provided with a pressure-reducing membrane, so that the pressure in the shock wave that is higher than the front exhaust gas can be further reduced by doing work outward. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of pulse cleaning of bag filter, where 1-air bag, 6-main pipeline connecting bag filter and front end, 16-cleaning opening valve;

[0039] Figure 2 A schematic diagram of the time axis of a group of gas supplementation time and pulse cleaning time in Example 1;

[0040] Figure 3 This is a timeline diagram of another group of gas supplementation time and pulse cleaning time in Example 1;

[0041] Figure 4 It is a schematic diagram of a voltage stabilizing device for a bag filter in Example 2;

[0042] Figure 5 for Figure 1 A magnified view of part A showing the shock wave;

[0043] Figure 6 It is a side view of the main pipeline connected to the front end of the bag filter, illustrating the structure and setting of the shock wave deflection structure;

[0044] Figure 7 for Figure 6 PP section view;

[0045] Figure 8 for Figure 6 QQ section view;

[0046] Fig. 9 It is a schematic diagram of the main pipeline connected to the front end of the bag filter, showing the setting of the pressure relief membrane;

[0047] Fig.10It is a schematic diagram of the function of the pressure relief membrane;

[0048] Fig.11 This is a schematic diagram of the voltage stabilizing device of the bag filter in Example 3. DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with the accompanying drawings:

[0050] Example 1

[0051] In the voltage stabilization method of the bag filter of this embodiment, before each pulse cleaning starts, gas is added to the bag filter or the main pipeline connected to the front end of the bag filter, and the gas addition process lasts for a period of time. The molar amount of the added gas V 1 The gas molar volume V of this pulse cleaning 2 Between V 1 =95%V 2 ~105%V 2 .

[0052] The pressure of the supplementary gas P 0 The pressure P in the main pipe connected to the bag filter or the bag filter and the front end 1 Meet 0.95P 1 <P 0 <1.05P 1 , the pressure of the supplementary gas P 0 You can choose 1.02P 1 , 1.03P 1 , 1.04P 1 , P 1 , 0.99P 1 , 0.98P 1 or 0.96P 1 The supplementary gas output from the gas source with a higher pressure can be adjusted to meet the pressure requirements, thus reducing the pressure fluctuation at the front end.

[0053] The pulse cleaning start time is t 1 , pulse cleaning duration is Δt 1 , then the pulse valve cleaning end time is t 3 =t 1 +Δt 1 ; The start time of gas replenishment is t 0 , the start time of gas replenishment t 0 At the pulse cleaning start time t 1 Before; the duration of gas replenishment is Δt 0 , then the air supply closing time is t 2 =t 0 +Δt 0 ; where Δt0 >Δt 1 , preferably, the duration of the supplementary gas is Δt 0 With pulse cleaning duration Δt 1 Between, Δt 0 =5Δt 1 ~20Δt 1 , for example, Δt 0 Take 5Δt 1 , 10Δt 1 or 20Δt 1 .

[0054] A preferred method is Figure 2 As shown, the air supply closing time t 2 =t 1 +kΔt 1 or 2 =t 3 -(1-k)Δt 1 , k is between 0.4 and 0.6, for example, k is 0.4, 0.41, 0.49, 0.5, 0.51, 0.55, 0.59 or 0.6. After experiments, within the above values, the pressure fluctuation can be reduced to the requirement of ±10Pa. Air replenishment closing time t 2 At the pulse cleaning start time t 1 And pulse valve cleaning end time t 3 between.

[0055] In this embodiment, for example, the duration of a pulse cleaning is 0.1s, and gas is added 0.45s, 0.96s or 1.94s before the start of the pulse cleaning. The corresponding k values ​​are 0.5, 0.4 or 0.6, respectively. The gas replenishment process ends when the pulse cleaning is in progress. The corresponding gas replenishment duration is 0.5s, 1s or 2s, respectively. The molar amount of the supplementary gas V 1 Select 95% V 2 、99%V 2 , 100% V 2 、104%V 2 Or 105%V 2 , the pressure of the supplementary gas P 0 Select 1.04P 1 , P 1 or 0.99P 1 After experiments, it was found that within the above values, the pressure fluctuation can be reduced to within the requirement of ±10Pa.

[0056] like Figure 3 As shown, another preferred method is to close the air supply time t 2 The pulse cleaning start time t 1For example, the duration of a pulse cleaning is 0.08s. Gas is added 0.4s, 1s, or 1.6s before the start of the pulse cleaning. The gas replenishment process ends when the pulse cleaning starts. The corresponding gas replenishment duration is 0.4s, 1s, or 1.6s. The molar amount of the supplementary gas V 1 Select 95% V 2 、97%V 2 , 100% V 2 、102%V 2 Or 105%V 2 , the pressure of the supplementary gas P 0 Select P 1 , 1.04P 1 or 0.98P 1 After experiments, it was found that within the above values, the pressure fluctuation can be reduced to within the requirement of ±10Pa.

[0057] Example 2

[0058] like Figure 4 As shown, the pressure stabilizing device of the bag dust collector of this embodiment includes: an air source for providing supplementary gas; a regulating mechanism, the regulating mechanism is respectively arranged to be connectable with the air source and the target position, and the air source, the regulating mechanism and the target position form a connectable air path. The target position is the bag dust collector or the main pipeline 6 connected to the bag dust collector and the front end. In this embodiment, the target position is selected in the main pipeline 6 connected to the bag dust collector and the front end.

[0059] This embodiment also includes a master controller 7, which controls the opening and closing of the regulating mechanism, and monitors the pressure fluctuation of the main pipeline 6 connected to the front end of the bag filter. In this embodiment, the master controller 7 uses a PLC. The gas source described in this embodiment is an air bag 1, and the air bag 1 in the bag filter is used to provide gas for pulse cleaning, that is, the gas for pulse cleaning in this embodiment and the supplementary gas before pulse cleaning are the same gas source.

[0060] The first scheme of the regulating mechanism is that the regulating mechanism includes: an opening and closing and regulating device, both ends of which are respectively connected to the air bag 1 and the main pipeline 6, and the main controller 7 controls the opening and closing and regulating device.

[0061] The second scheme of the regulating mechanism is that the regulating mechanism includes an opening and closing and regulating device and a first regulating device, the first regulating device and the opening and closing and regulating device are combined and connected to each other to form an air path, and the two ends of the air path are respectively arranged to be connectable with the air bag 1 and the main pipeline 6.

[0062] A third scheme of the regulating mechanism is that the regulating mechanism includes an opening and closing and regulating device, a first regulating device and a second regulating device. The opening and closing and regulating device, the first regulating device and the second regulating device are combined and connected to each other to form an air path, and both ends of the air path are respectively arranged to be connectable with the air bag 1 and the main pipeline 6.

[0063] Based on the third scheme of the regulating mechanism, the opening, closing and regulating device includes a first pressure regulating valve 3, a sequence valve 2 and a switch valve 5, the first regulating device includes a flow regulating valve 4, the first pressure regulating valve 3, the flow regulating valve 4, the sequence valve 2 and the switch valve 5 are combined and connected to form an air circuit, and the two ends of the air circuit are respectively connected to the air bag 1 and the second regulating device, the second regulating device is connected to the main pipeline 6, the opening pressure of the sequence valve 2 is equal to the set outlet pressure of the first pressure regulating valve 3, the main controller 7 controls the opening and closing of the switch valve 5, the main controller 7 controls the flow regulating valve 4, and the second regulating device is used to adjust the air pressure.

[0064] The second regulating device includes a first gas expansion tank 11 and a second gas expansion tank 12, a first pressure regulating valve 3, a flow regulating valve 4, a sequence valve 2 and a switch valve 5 connected in sequence, one end of the first pressure regulating valve 3 is connected to the gas bag 1, and the other end is connected to the flow regulating valve 4, the first gas expansion tank 11 and the second gas expansion tank 12 are connected through a gas circuit switch 13, the gas circuit switch 13 is a gas circuit one-way valve, and the connection direction of the gas circuit one-way valve is from the first gas expansion tank 11 to the second gas expansion tank 12. The inlet of the first gas expansion tank 11 is connected to the outlet of the switch valve 5, the outlet of the second gas expansion tank 12 is connected to the main pipeline 6, and the main controller 7 controls the opening and closing of the switch valve 5. The supplementary gas enters the first gas expansion tank 11 and is decompressed, and the supplementary gas enters the second gas expansion tank 12 through the gas circuit one-way valve to further decompress, and finally the supplementary gas enters the main pipeline 6. This embodiment also includes a hand valve, and the two ends of the hand valve are respectively connected to the first pressure regulating valve 3 and the gas bag 1. The hand valve 10 is used to cut off the gas source, i.e., the gas bag 1, during system inspection and maintenance.

[0065] This embodiment also includes two quick exhaust valves 8, 17 and an electromagnetic reversing valve 9. The switch valve 5 is a pneumatic butterfly valve. The master controller 7 controls the electromagnetic reversing valve 9. The electromagnetic reversing valve 9 controls the reversing of the cylinder 18 of the pneumatic butterfly valve. A quick exhaust valve 8, 17 is connected between the two cavities of the cylinder 18 of the pneumatic butterfly valve and the electromagnetic reversing valve 9. The master controller 7 controls the electromagnetic reversing valve 9, so that the electromagnetic reversing valve 9 controls the opening and closing of the pneumatic butterfly valve. The electromagnetic reversing valve 9 is powered on or off, controls the reversing of the cylinder 18 of the pneumatic butterfly valve, and opens or closes the pneumatic butterfly valve. In the process of opening and closing the pneumatic butterfly valve, the quick exhaust valves 8, 17 are respectively connected to a cavity of the cylinder 18, so that the cavity of the cylinder 18 can be quickly exhausted. For example, when the pneumatic butterfly valve is opened, the upper cavity is inlet and the lower cavity is exhausted. At this time, the lower cavity is quickly exhausted from the quick exhaust valve 17. When the pneumatic butterfly valve is closed, the lower cavity is inlet, the upper cavity is exhausted, and the upper cavity is quickly exhausted from the quick exhaust valve 8. This reduces the reaction lag time of the pneumatic butterfly valve cylinder.

[0066] This embodiment also includes a flow monitor and a pressure monitor, which are respectively arranged on the gas path between the gas source, the regulating mechanism and the target position, and are used to monitor the gas flow and gas pressure. The flow monitor includes a first flow meter F 1 , monitor the gas flow of the gas bag 1 flowing through the regulating mechanism, the first flow meter F 1 It is arranged at the outlet where the air bag 1 is connected to the switch valve 5. The flow monitor includes a second flow meter F 2 , used to monitor the gas flow rate flowing through the gas path of the regulating mechanism, the second flow meter F 2 It is arranged between the flow regulating valve 4 and the sequence valve 2. The pressure monitor includes a first pressure gauge P 1 , Second pressure gauge P 4 、The third pressure gauge P 5 、The fourth pressure gauge P 6 , the main pipeline 6 is provided with a first pressure gauge P 1 A second pressure gauge P is provided between the flow regulating valve 4 and the first pressure regulating valve. 4 , a third pressure gauge P is provided at the first gas expansion tank 11 5 , a fourth pressure gauge P is provided at the second gas expansion tank 12 6 The flow monitor and pressure monitor feed back data to the master controller 7.

[0067] Usage process: the switch valve 5 is opened according to the time set by the main controller 7; and when the cleaning opening valve 16 is opened, the main controller 7 controls the switch valve 5 to close. The opening and closing of the sequence valve 2 is as follows: during pulse cleaning, the pressure in the air bag 1 drops, the outlet gas pressure of the first pressure regulating valve 3 drops, and the gas pressure passing through the sequence valve 2 drops, which does not reach the opening pressure of the sequence valve 2, and the sequence valve 2 is closed; at this time, the switch valve 5 is closed at the same time. After a pulse cleaning is completed, the pressure in the air bag 1 is replenished and then rises, and the gas pressure after the pressure regulation of the first pressure regulating valve 3 reaches the opening pressure of the sequence valve 2, and the sequence valve 2 opens; in this way, the air bag 1 can be used as a gas source to replenish the gas. Therefore, during the pulse cleaning process, the gas molar amount in the system remains stable, and the volume compression of the gas in the system is greatly reduced, which fundamentally eliminates the pressure fluctuation in the system. Repeat the implementation before the next pulse cleaning.

[0068] Since the amount of supplementary gas is small, it will not affect the amount of gas and air pressure in the air bag 1. A sequence valve 2 is set, and the air pressure of the air bag drops during pulse cleaning, so that the sequence valve is closed, and the start of pulse cleaning is synchronized with the closing action of the sequence valve. The switch valve 5 is set, first, it can control the opening time of the switch valve 5, so that when the pressure of the air bag 1 reaches the opening pressure of the sequence valve 2, the start of supplementary gas can be controlled at any time, so that the opening time of supplementary gas can be controlled; second, it can avoid erroneous operation caused by failure of the sequence valve 2.

[0069] The flow rate of the supplementary gas is regulated by the flow regulating valve 4. The first pressure regulating valve 3, the first gas expansion tank 11 and the second gas expansion tank 12 all play a role in regulating the pressure of the supplementary gas.

[0070] like Figure 5 As shown, a small amount of increase in gas ΔP generates a shock wave U in the main duct 6 of the bag filter, that is, airflow impact, which may cause pressure fluctuations. In order to achieve a better effect of avoiding pressure fluctuations, this embodiment adds a shock wave deflection structure 14 and a pressure relief membrane 15. Figure 6 , Figure 7 and Figure 8 As shown, the shock wave redirection structure 14 is disposed in a portion of the main pipeline 6. Figure 6 As shown, the shock wave deflection structure 14 divides the radial cross section of the main pipe 6 into two spaced parts. The shock wave deflection structure 14 is a plate structure. The shock wave deflection structure 14 has two ends, namely a first end 26 and a second end 27. The width and height of the first end 26 are greater than the width and height of the second end 27. The first end 26 is the end close to the bag filter, and the second end 27 is the end away from the bag filter. Figure 6 As shown, the shock wave deflection structure 14 divides the radial cross section of the main pipe 6 into two parts separated by left and right intervals, so that dust will slide along the surface of the shock wave deflection structure 14, avoiding dust accumulation on the surface of the shock wave deflection structure 14. Fig. 9 and Fig.10 As shown, this embodiment also includes a pressure-relieving membrane 15. A plurality of openings are provided on the wall of the main pipe 6, and the openings cover the pressure-relieving membrane 15. The pressure-relieving membrane 15 is a rubber membrane. The rubber membrane is provided so that when the shock wave passes through the rubber membrane, work is performed externally. The total axial length of the shock wave deflection structure 14 and the pressure-relieving membrane 15 is greater than or equal to 1.1 m.

[0071] The shock wave redirection structure 14 changes the shock wave flow direction, so that the shock wave U performs reverse work and is distributed and offset radially toward the pipe 6, thereby reducing the pressure in the layer and slowing down the reverse conduction speed of the shock wave. Since the pressure in the shock wave is relatively increased relative to the exhaust gas, the pressure-relieving membrane 15 eliminates the excess pressure by performing work externally, thereby further eliminating the shock wave U.

[0072] The present invention sets a sequence valve, and uses the air bag to reduce the air pressure during pulse cleaning, so that the sequence valve is closed, so that the pulse cleaning starts and the sequence valve closing action is synchronized; an electromagnetic reversing valve and a quick exhaust valve are set to reduce the cylinder reaction lag time of the pneumatic butterfly valve; in order to reduce the error in practical application, a shock wave direction-changing structure is set, so that the shock wave is dispersed radially to the main pipeline, and after changing direction, it cancels each other out; the outer wall of the pipeline is also provided with a pressure-reducing membrane, so that the pressure in the shock wave that is higher than the front exhaust gas can be further reduced by doing work outward. This embodiment can be applied to the method described in Example 1.

[0073] Example 3

[0074] like Fig.11 As shown, the pressure stabilizing device of the bag-type dust collector of this embodiment includes: an air source for providing supplementary gas; a regulating mechanism, the regulating mechanism is respectively arranged to be connectable with the air source and the target position, and the air source, the regulating mechanism and the target position form a connectable air path. The target position is the bag-type dust collector or the main pipeline 6 connected to the front end of the bag-type dust collector. In this embodiment, the target position is selected in the main pipeline 6 connected to the front end of the bag-type dust collector. The air source of this embodiment is an independent air source 20 that is independent of the air bag 1. This embodiment also includes a main controller 7, which controls the opening and closing of the regulating mechanism, and the main controller 7 monitors the pressure fluctuation of the main pipeline 6 connected to the front end of the bag-type dust collector. In this embodiment, the main controller 7 uses a PLC.

[0075] The regulating mechanism includes an opening and closing device and a first regulating device. The two ends of the gas path formed by the opening and closing device and the first regulating device are respectively arranged to be connectable with an independent gas source 20 and a target position, namely, the main pipeline 6. The main controller 7 controls the opening and closing device.

[0076] The opening and closing device includes a switch valve 5, and the first regulating device includes a flow regulating valve 4 and a second pressure regulating valve 21. The switch valve 5, the second pressure regulating valve 21 and the flow regulating valve 4 are connected in series, and the two ends of the gas path formed in series are respectively connected to an independent gas source 20 and a target position, that is, a main pipeline 6. The main controller 7 controls the switch valve 5, and the main controller 7 controls the flow regulating valve 4.

[0077] This embodiment also includes two quick exhaust valves 8, 17 and an electromagnetic reversing valve 9. The switch valve 5 is a pneumatic butterfly valve. The master controller 7 controls the electromagnetic reversing valve 9. The electromagnetic reversing valve 9 controls the reversing of the cylinder 18 of the pneumatic butterfly valve. A quick exhaust valve 8, 17 is connected between the two cavities of the cylinder 18 of the pneumatic butterfly valve and the electromagnetic reversing valve 9. The master controller 7 controls the electromagnetic reversing valve 9, so that the electromagnetic reversing valve 9 controls the opening and closing of the pneumatic butterfly valve. The electromagnetic reversing valve 9 is powered on or off, controls the reversing of the cylinder 18 of the pneumatic butterfly valve, and opens or closes the pneumatic butterfly valve. In the process of opening and closing the pneumatic butterfly valve, the quick exhaust valves 8, 17 are respectively connected to a cavity of the cylinder 18, so that the cavity of the cylinder 18 can be quickly exhausted. For example, when the pneumatic butterfly valve is opened, the upper cavity is inlet and the lower cavity is exhausted. At this time, the lower cavity is quickly exhausted from the quick exhaust valve 17. When the pneumatic butterfly valve is closed, the lower cavity is inlet, the upper cavity is exhausted, and the upper cavity is quickly exhausted from the quick exhaust valve 8. This reduces the reaction lag time of the pneumatic butterfly valve cylinder.

[0078] This embodiment also includes a second regulating mechanism, and the two ends of the second regulating mechanism are respectively arranged to be communicable with the first regulating device and the target position, that is, the main pipeline 6. The second regulating mechanism includes a first gas expansion tank 11 and a second gas expansion tank 12, a second pressure regulating valve 21, a flow regulating valve 4 and a switch valve 5 are connected in sequence, one end of the second pressure regulating valve 21 is arranged to be communicable with the independent gas source 20, and the other end is connected to the flow regulating valve 4. The first gas expansion tank 11 and the second gas expansion tank 12 are arranged to be communicable, the inlet of the first gas expansion tank 11 is connected to the outlet of the switch valve 5, the outlet of the second gas expansion tank 12 is communicated with the target position, that is, the main pipeline 6, and the main controller 7 controls the opening and closing of the switch valve 5.

[0079] The first gas expansion tank 11 and the second gas expansion tank 12 are connected by a gas circuit switch 13, and the gas circuit switch 13 is a gas circuit one-way valve, and the connection direction of the gas circuit one-way valve is from the first gas expansion tank 11 to the second gas expansion tank 12. The supplementary gas is decompressed after entering the first gas expansion tank 11, and the supplementary gas enters the second gas expansion tank 12 through the gas circuit one-way valve to further decompress, and finally the supplementary gas enters the main pipeline 6. This embodiment can simultaneously use the flow monitor, pressure monitor, hand valve 10, shock wave redirection structure 14 and pressure relief membrane 15 described in Example 2.

[0080] When in use, the master controller 7 controls the opening and closing of the switch valve 5. The supplementary gas is provided by an independent gas source 20 independent of the gas bag 1, and the supplementary gas enters the main pipeline 6 through the pressure regulation of the second pressure regulating valve 21, the first gas expansion tank 11 and the second gas expansion tank 12. The flow rate of the supplementary gas is regulated by the flow regulating valve 4. Except for the absence of the sequence valve, this embodiment is the same as Example 2. Since an independent gas source is used, the switch control is relatively simple. This embodiment can be applied to the method described in Example 1. The two schemes of this embodiment and Example 2 can be selected according to actual needs.

[0081] The present invention introduces supplementary gas into the bag filter or the main pipeline connected to the bag filter and the front end in advance, cuts off the supplementary gas before the pulse, keeps the gas volume in the bag filter and the main pipeline stable, and the supplementary gas undergoes decompression and expansion, so that the adiabatic compression is changed into isothermal compression, and the PV λ = constant becomes PV = constant, λ is the adiabatic index, and for air, λ is 1.4, that is, the magnitude of the change in volume changes from the original exponential level to the current 1, which greatly reduces the impact of the increase in volume on the pressure. In this way, it is possible to avoid the instantaneous compression of the original gas in the bag filter and the main pipeline due to the instantaneous increase in the cleaning gas during pulse cleaning, which can greatly reduce the pressure fluctuations caused by the increase in gas volume at the front end. At the same time, during pulse cleaning, the pulse duration is very short, and the supplementary gas is added in advance, and the duration of the supplementary gas is 5 to 20 times longer than the pulse duration. In general, the pressure fluctuation can be reduced to within the requirement of ±10Pa.

[0082] The present invention can make the pressure fluctuation in the bag filter meet the requirements and satisfy the process negative pressure fluctuation range required by precision production such as vapor deposition, and has a good effect on improving the production quality of high value-added products such as lasers and optical fiber preforms.

[0083] The embodiments of the present invention are only used to illustrate the present invention and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutes that can be thought of by those skilled in the art are all within the protection scope of the present invention.

Claims

1. A voltage stabilizing device for bag filter, It is characterized in that include: Gas source; The regulating mechanism, the air source, the regulating mechanism and the target position form a communicable air path, and the target position is the bag filter or the main pipeline connecting the bag filter and the front end; The master controller controls the opening and closing of the regulating mechanism and / or the parameter adjustment. The master controller monitors the pressure fluctuation of the main pipeline connecting the bag filter and the front end. The gas source includes an air bag; the regulating mechanism includes: an opening and closing and regulating device and a first regulating device, the first regulating device and the opening and closing and regulating device are combined and connected to form an air path, the two ends of the air path are respectively connected to the gas source and the target position, the main controller controls the opening and closing and regulating device, It also includes a second regulating device, the opening and closing and regulating device includes a first pressure regulating valve, a sequence valve and a switch valve, the first regulating device includes a flow regulating valve, the first pressure regulating valve, the flow regulating valve, the sequence valve and the switch valve are combined and connected to form an air path, the two ends of the air path are respectively connected to the air source and the second regulating device, the second regulating device is connected to the target position, the opening pressure of the sequence valve is equal to the set outlet pressure of the first pressure regulating valve, the main controller controls the opening and closing of the switch valve, and the main controller controls the flow regulating valve. It also includes a shock wave turning structure, which is arranged in a part of the main pipeline. The shock wave turning structure divides the radial cross-section of the main pipeline into two spaced parts. The shock wave turning structure has two ends, namely a first end and a second end. The width and / or height of the first end is greater than the width and / or height of the second end. The position of the first end is closer to the bag filter than the position of the second end. The shock wave turning structure divides the radial cross-section of the main pipeline into two spaced parts on the left and right.

2. The voltage stabilizing device for bag filter according to claim 1, It is characterized in that The second regulating device includes a first gas expansion tank and a second gas expansion tank, a first pressure regulating valve, a flow regulating valve, a sequence valve and a switch valve are connected in sequence, one end of the first pressure regulating valve is arranged to be communicable with a gas source, and the other end is connected to the flow regulating valve, the first gas expansion tank and the second gas expansion tank are arranged to be communicable, the inlet of the first gas expansion tank is connected to the outlet of the switch valve, and the outlet of the second gas expansion tank is communicated with the target position.

3. A voltage stabilizing device for bag filter, It is characterized in that include: Gas source; The regulating mechanism, the air source, the regulating mechanism and the target position form a communicable air path, and the target position is the bag filter or the main pipeline connecting the bag filter and the front end; The master controller controls the opening and closing of the regulating mechanism and / or the parameter adjustment. The master controller monitors the pressure fluctuation of the main pipeline connecting the bag filter and the front end. The regulating mechanism comprises an opening and closing device and a first regulating device, the gas source is an independent gas source, and the two ends of the gas path formed by the opening and closing device and the first regulating device are respectively arranged to be connectable with the independent gas source and the target position, and the main controller controls the opening and closing device and / or the first regulating device. The opening and closing device includes a switch valve, and the first regulating device includes a flow regulating valve and a second pressure regulating valve. The switch valve, the second pressure regulating valve and the flow regulating valve are combined and connected to form an air circuit. The two ends of the air circuit are respectively connected to an independent air source and a target position. The main controller controls the opening and closing of the switch valve, and the main controller controls the flow regulating valve. It also includes a shock wave turning structure. The shock wave turning structure is arranged in a part of the main pipeline. The shock wave turning structure divides the radial cross-section of the main pipeline into two spaced parts. The shock wave turning structure has two ends, namely a first end and a second end. The width and / or height of the first end are greater than the width and / or height of the second end. The position of the first end is closer to the bag dust collector than the position of the second end; the shock wave turning structure divides the radial cross-section of the main pipeline into two spaced parts on the left and right.

4. The voltage stabilizing device for bag filter according to claim 3, It is characterized in that It also includes a second regulating mechanism, and both ends of the second regulating mechanism are respectively arranged to be communicable with the first regulating device and the target position; the second regulating mechanism includes a first gas expansion tank and a second gas expansion tank, a second pressure regulating valve, a flow regulating valve and a switch valve are connected in sequence, one end of the second pressure regulating valve is arranged to be communicable with an independent gas source, and the other end is connected to the flow regulating valve, the first gas expansion tank and the second gas expansion tank are arranged to be communicable, the inlet of the first gas expansion tank is connected to the outlet of the switch valve, and the outlet of the second gas expansion tank is communicated with the target position.

5. The voltage stabilizing device for a bag filter according to claim 1, 2, 3 or 4, It is characterized in that It also includes two quick exhaust valves and an electromagnetic reversing valve. The switch valve is a pneumatic butterfly valve. The electromagnetic reversing valve controls the reversing of the cylinder of the pneumatic butterfly valve. A quick exhaust valve is respectively connected between the two cavities of the cylinder of the pneumatic butterfly valve and the electromagnetic reversing valve. The main controller controls the electromagnetic reversing valve.

6. The voltage stabilizing device for bag filter according to claim 1 or 3, It is characterized in that It also includes a pressure-relieving membrane. A plurality of openings are provided on the wall of the main pipeline, and the openings are covered with the pressure-relieving membrane.

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