Device for measuring ventilation volume of gap of dust removal filter bag

Abstract

The utility model relates to the technical field of fabric air permeability measurement, in particular to a dust removal filter bag gap air permeability measuring device which is structurally characterized in that a sleeve base is arranged at the bottom end of a rack, and a base is arranged at the top end of the rack; the bottom end of the sealing steel cylinder is arranged on the sleeve base, and the top end of the sealing steel cylinder penetrates through the base; an upper cover used for blocking a top opening of the sealing steel cylinder is arranged above the base, and the pattern plate is arranged on the periphery of the top opening of the sealing steel cylinder in a sleeving mode and arranged between the base and the upper cover; an opening and closing mechanism and an upper pipe joint are arranged on the upper cover, the upper pipe joint is communicated with an inner cavity of the sealing steel cylinder, and a lower pipe joint is arranged on the bottom surface of the sleeve base and is communicated with the inner cavity of the sealing steel cylinder; and the base and the sealing steel cylinder, the tubesheet and the base, and the tubesheet and the upper cover are all connected in a sealing manner. The device can be used for measuring the air permeability of the gap between the filter bag surface strip and the tubesheet.

Description

Technical Field

[0001] This utility model relates to the field of fabric air permeability measurement technology, specifically to a dust collector filter bag gap air permeability measuring device, which is particularly suitable for measuring the air permeability of the gap between the filter bag's outer strip and the tube sheet. Background Technology

[0002] Dust collector filter bags are widely used in industries such as thermal power generation, steel, and cement. This is because particulate matter in the dust has been proven to be one of the main pollutants causing air pollution and poses a significant health risk. Therefore, dust collector filter bags are needed to filter particulate matter from the dust. Their main principle is that the fibrous structure on their surface blocks and deposits airborne particles on the filter bag's surface, thus achieving air purification. Therefore, the filter bag's permeability directly affects the purification effect.

[0003] Air permeability testers are typically used to test the air permeability of filter bags. These testers utilize the pressure difference method to measure the air permeability of fabrics or films. Generally, a single piece of material is placed in a fixture for measurement. However, existing air permeability testers have relatively small fixtures, resulting in a small test area. The diameter of the test port is typically less than 12cm, and they can only test individual pieces of material.

[0004] There is an unavoidable gap between the filter bag's faceplate and the tube sheet. During the filtration process, gas will pass through these gaps, causing a deviation between the final air purification result and the theoretical result. The air permeability between the faceplate and the tube sheet is one of the direct indicators of the filter bag's sealing performance. However, air permeability testers are not suitable for measuring the sealing performance between the faceplate and the tube sheet because the filter bag opening is relatively large, generally with a diameter of 120-160 cm, and it must be placed inside the tube sheet, which is usually a rectangular tube sheet with a side length of approximately 330 cm. Furthermore, the bag opening is hollow, allowing gas to pass through. Therefore, the existing fixtures of air permeability testers cannot be used to measure the air permeability between the filter bag's faceplate and the tube sheet. Currently, the evaluation mainly relies on workers manually rotating the faceplate and measuring the friction between the faceplate and the tube sheet, resulting in inconsistent testing standards. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a dust collector filter bag gap air permeability measuring device, which can measure the air permeability between the filter bag's surface strip and the tube sheet.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dust collector filter bag gap air permeability measuring device includes a sleeve base at the bottom of the frame and a base at the top of the frame; the bottom end of a sealing steel cylinder is placed on the sleeve base, and the top end of the sealing steel cylinder passes through the base; an upper cover for sealing the top opening of the sealing steel cylinder is provided above the base; a perforated plate is fitted around the outer periphery of the top opening of the sealing steel cylinder and placed between the base and the upper cover; the upper cover is provided with an opening and closing mechanism and an upper pipe joint, which communicates with the inner cavity of the sealing steel cylinder; the bottom surface of the sleeve base is provided with a lower pipe joint, which communicates with the inner cavity of the sealing steel cylinder; the base and the sealing steel cylinder, the perforated plate and the base, and the perforated plate and the upper cover are all sealed connections.

[0008] Preferably, the opening and closing mechanism includes a pressure handwheel, a lifting handwheel, a support frame, a thrust cylindrical roller bearing, and a lifting handwheel sleeve. The support frame is mounted on the base, the lifting handwheel sleeve is mounted on the upper cover, the thrust cylindrical roller bearing is placed in the upper groove of the lifting handwheel sleeve, the lifting handwheel passes through the top plate of the support frame and is placed inside the lifting handwheel sleeve, and the pressure handwheel passes through the top plate of the support frame and contacts the upper cover.

[0009] Preferably, there are two pressure handwheels, which are located on both sides of the lifting handwheel. Both the pressure handwheel and the lifting handwheel are connected to the top plate of the support frame by threaded connections.

[0010] Preferably, the upper pipe joint is connected to an air compressor.

[0011] Preferably, the lower pipe connector is connected to an air flow meter.

[0012] Preferably, the base has a through hole, and the inner wall of the through hole is sealed to the outer wall of the sealing steel cylinder by welding.

[0013] Preferably, O-rings are used to seal the gap between the perforated plate and the base, and between the perforated plate and the top cover.

[0014] The advantages and effects of this utility model are as follows:

[0015] In this invention, the base and the sealing steel cylinder, the tube sheet and the base, and the tube sheet and the top cover are all sealed. When measuring the air permeability between the filter bag's face strip and the tube sheet, it is only necessary to seal the bag opening of the filter bag's face strip as well. Gas can only pass through the gap between the filter bag's face strip and the tube sheet, thus accurately detecting the air permeability between the filter bag's face strip and the tube sheet, and obtaining accurate air permeability test results for the filter bag. Attached Figure Description

[0016] Figure 1 This is a partial structural schematic diagram of the opening and closing mechanism of this utility model;

[0017] Figure 2This is a partial cross-sectional view of the opening and closing mechanism of this utility model;

[0018] Figure 3 This is a schematic diagram showing the location of the gap between the decorative plate and the surface strip of this utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 5 This is a cross-sectional view of the overall structure of this utility model;

[0021] Figure 6 This is a partial structural diagram of the bottom of this utility model;

[0022] Figure 7 This is a partial structural diagram of the tube sheet and filter bag of this utility model.

[0023] In the diagram: 1. Pressure handwheel, 2. Lifting handwheel, 3. Support frame, 4. Thrust cylindrical roller bearing, 5. Lifting handwheel sleeve, 6. Upper pipe joint, 7. Base, 8. Tube plate, 9. Top cover, 10. Filter bag gauge bar, 11. O-ring seal, 12. Filter bag, 13. Frame, 14. Sealing steel cylinder, 15. Sleeve base, 16. Lower pipe joint, 17. Gap between gauge bar and tube sheet. Detailed Implementation Example

[0024] like Figure 1-7 As shown, a dust collector filter bag gap air permeability measuring device has the following structure: the frame 13 is assembled from 4040 aluminum profiles, and each aluminum profile is fixedly connected by angle brackets and T-bolts. The bottom of frame 1 is connected to sleeve base 15 with cross-groove recessed hexagonal head bolts, and the top of frame 13 is connected to base 7 with cross-groove recessed hexagonal head bolts. A through hole is provided in the middle of base 7, and the inner wall of the through hole is sealed to the outer wall of the top of the sealing steel cylinder by welding. The bottom of the sealing steel cylinder 14 is placed on sleeve base 15. A top cover 9 for sealing the top opening of the sealing steel cylinder 14 is provided above base 7. A perforated plate 8 is fitted around the outer periphery of the top opening of the sealing steel cylinder 14 and placed between base 7 and top cover 9. The top cover 9 is provided with an opening and closing mechanism and an upper pipe joint 6. One end of the upper pipe joint 6 communicates with the inner cavity of the sealing steel cylinder 14, and the other end of the upper pipe joint 6 is connected to an air compressor. A lower pipe joint 16 is provided on the bottom surface of sleeve base 15. One end of the lower pipe joint 16 communicates with the inner cavity of the sealing steel cylinder 14, and the other end of the lower pipe joint 16 is connected to an air flow detector. O-rings are used to seal the connection between perforated plate 8 and base 7 and between perforated plate 8 and top cover 9.

[0025] The opening and closing mechanism includes a pressure handwheel 1, a lifting handwheel 2, a support frame 3, a thrust cylindrical roller bearing 4, and a lifting handwheel sleeve 5. The support frame 3 is mounted on the base 7, and the lifting handwheel sleeve 5 is mounted on the upper cover 9. The thrust cylindrical roller bearing 4 is placed in the upper groove of the lifting handwheel sleeve 5. The lifting handwheel 2 passes through the top plate of the support frame 3 and is placed in the groove of the lifting handwheel sleeve 5. Two pressure handwheels 1 are provided, located on both sides of the lifting handwheel 2. The pressure handwheels 1 pass through the top plate of the support frame 3 and contact the upper cover 9. Both the pressure handwheel 1 and the lifting handwheel 2 are connected to the top plate of the support frame 3 by threaded connections.

[0026] The working process and principle of this utility model are as follows:

[0027] Rotate the lifting handwheel 2 to open the upper cover 9, put the filter bag 12 with the sealing strip 10 at the bag opening into the sealed steel cylinder 14, open the valve of the upper pipe joint 6, close the valve of the lower pipe joint 16, and then rotate the lifting handwheel 2 and the pressure handwheel 1 to apply pressure to the upper cover 9 to form a seal inside.

[0028] The air compressor starts working, continuously filling the interior of the upper cover 9 with gas at a pressure of 0.1MPa through the upper pipe joint 6, and then opening the valve of the lower pipe joint 16, and detecting the air permeability through the air flow detector connected to the lower pipe joint 16.

[0029] During testing, the filter bag opening must be sealed to ensure that gas can only pass through the gap between the filter bag faceplate 10 and the tube sheet 8. Gas on the high-pressure side will permeate to the low-pressure side through the gap between the tube sheet 8 and the filter bag faceplate 10. An air flow detector connected to the bottom of the sealed steel cylinder 14 can detect the amount of gas passing through in real time, thereby determining the air permeability of the gap between the tube sheet 8 and the faceplate 10 under a pressure of 0.1 MPa.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for measuring the air permeability of a dust collector filter bag, characterized in that, A sleeve base (15) is provided at the bottom of the frame (13), and a base (7) is provided at the top of the frame (13); the bottom of the sealing steel cylinder (14) is placed on the sleeve base (15), and the top of the sealing steel cylinder (14) passes through the base (7); a top cover (9) for sealing the top opening of the sealing steel cylinder (14) is provided above the base (7), and a perforated plate (8) is fitted around the outer periphery of the top opening of the sealing steel cylinder (14) and placed between the base (7) and the top cover (9); the top cover (9) is provided with an opening and closing mechanism and an upper pipe joint (6), the upper pipe joint (6) is connected to the inner cavity of the sealing steel cylinder (14), and a lower pipe joint (16) is provided on the bottom surface of the sleeve base (15), the lower pipe joint (16) is connected to the inner cavity of the sealing steel cylinder (14); the base (7) and the sealing steel cylinder (14), the perforated plate (8) and the base (7), and the perforated plate (8) and the top cover (9) are all sealed.

2. The dust collector filter bag gap air permeability measuring device according to claim 1, characterized in that, The opening and closing mechanism includes a pressure handwheel (1), a lifting handwheel (2), a support frame (3), a thrust cylindrical roller bearing (4), and a lifting handwheel sleeve (5). The support frame (3) is mounted on the base (7), the lifting handwheel sleeve (5) is mounted on the upper cover (9), the thrust cylindrical roller bearing (4) is placed in the upper groove of the lifting handwheel sleeve (5), the lifting handwheel (2) passes through the top plate of the support frame (3) and is placed in the lifting handwheel sleeve (5), and the pressure handwheel (1) passes through the top plate of the support frame (3) and contacts the upper cover (9).

3. The dust collector filter bag gap air permeability measuring device according to claim 2, characterized in that, There are two pressure handwheels (1), which are located on both sides of the lifting handwheel (2). The pressure handwheels (1) and the lifting handwheel (2) are connected to the top plate of the support frame (3) by threaded connection.

4. The dust collector filter bag gap air permeability measuring device according to claim 1, characterized in that, The upper pipe joint (6) is connected to an air compressor.

5. The dust collector filter bag gap air permeability measuring device according to claim 1, characterized in that, The lower pipe connector (16) is connected to an air flow meter.

6. The dust collector filter bag gap air permeability measuring device according to claim 1, characterized in that, The base (7) has a through hole, and the inner wall of the through hole is sealed to the outer wall of the sealing steel cylinder by welding.

7. The dust collector filter bag gap air permeability measuring device according to claim 1, characterized in that, The flower plate (8) and the base (7) and the flower plate (8) and the top cover (9) are sealed with O-rings.

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