Filtering and silencing device of negative pressure screw fan

Abstract

The utility model discloses a negative pressure screw fan filtering silencer which comprises a filtering cylinder body, the cylinder body is detachably provided with a filtering cylinder cover, the side wall of the filtering cylinder body is provided with an air inlet close to the filtering cylinder cover, and the side wall of the filtering cylinder body is provided with an air outlet far away from the filtering cylinder cover. And the replaceable filter element is arranged between the air inlet and the air outlet in the filter cartridge, and the filter element can be replaced only by opening the detachable filter cartridge cover, so that the maintenance is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of fan equipment, in particular to a filtering and silencing device for a negative pressure screw fan. Background Art

[0002] Negative pressure fans use the cooling principle of air convection and negative pressure ventilation. Negative pressure fans are generally used for exhaust ventilation. They are installed outside the windows of workshops or factories. By selecting the downwind outlet and exhausting air outwards, they can discharge indoor gases and dust.

[0003] The negative pressure fan in the prior art generally lacks the function of dust removal and filtration. Although some prior arts have proposed improvements to this problem, for example, a Chinese patent with authorization announcement number CN 216199116 U3 discloses a dust removal and filtration negative pressure fan, including a frame, a horizontal plate fixedly installed inside the frame, a fixed seat fixedly installed on the upper surface of the horizontal plate, a motor fixedly installed on the upper surface of the fixed seat, a first through groove and a second through groove are opened on one side of the frame, the first through groove and the second through groove both correspond to the position of the ventilation chamber, a filter mesh plate is clamped in the first through groove, and an activated carbon plate is clamped in the second through groove.

[0004] However, the filter screen plate of the dust removal and filtering negative pressure fan is not easy to disassemble, and is inconvenient to replace in actual use. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the problems existing in the prior art, the utility model provides a negative pressure screw fan. By setting a replaceable filter element, the filter element can be replaced by simply opening the detachable filter cartridge cover, thereby simplifying maintenance.

[0006] Technical solution: The utility model provides the following technical solutions:

[0007] A negative pressure screw fan filtering and silencing device comprises a filter cylinder, the cylinder is detachably provided with a filter cylinder cover, the side wall of the filter cylinder is provided with an air inlet close to the filter cylinder cover, the side wall of the filter cylinder is provided with an air outlet away from the filter cylinder cover, and a replaceable filter element is installed inside the filter cylinder between the air inlet and the air outlet.

[0008] Preferably, the side wall of the filter cylinder is filled with noise reduction material.

[0009] Preferably, the air inlet is provided with an air inlet flange, and the air outlet is provided with an air outlet flange.

[0010] Preferably, the air inlet flange and the air outlet flange are provided with a pressure difference interface for installing a differential pressure switch.

[0011] Preferably, the filter cartridge cover is connected to the filter cartridge body via threads.

[0012] Preferably, a handle is installed on the filter cartridge cover.

[0013] Preferably, a sealing plate for fixing a replaceable filter element is installed on the inner wall of the filter cylinder, a gas through hole is arranged at the center of the sealing plate, and a fixing plate for fixing the replaceable filter element is arranged at a circumferential position of the gas through hole toward the filter cylinder cover. The replaceable filter element is columnar with a bottom adapter fixing plate, a top seal, and side walls made of filter material, and the height of the replaceable filter element is higher than the fixing plate.

[0014] Preferably, a sealing ring is installed between the replaceable filter element and the sealing plate.

[0015] Preferably, the side wall of the filter cylinder is also provided with a vacuum pressure relief valve.

[0016] Preferably, the air outlet flange is also provided with a negative pressure gauge interface and a negative pressure transmitter interface.

[0017] Working principle: The device is installed at the air inlet of the negative pressure screw fan. The gas enters the filter cylinder from the air inlet of the device. Since the top of the replaceable filter element is sealed, and the bottom is sealed with the sealing plate and the fixed plate, the gas can only pass through the side wall of the replaceable filter element (i.e. the filter material) to reach the gas through hole. In this process, the replaceable filter element whose filter material is fiber filter paper filters the gas, and the gas passes through the gas through hole and then enters the negative pressure screw fan from the air outlet.

[0018] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0019] 1. By setting up a replaceable filter element, the filter element can be replaced by simply opening the removable filter cartridge cover, which simplifies maintenance.

[0020] 2. All kinds of protective devices and sensors required for fan air intake are integrated into the cylinder, reducing joints and simplifying installation. It is both beautiful and cost-saving.

[0021] 3. Meet the requirements of noise reduction, filtration and overpressure protection of negative pressure screw fans. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the utility model;

[0023] Figure 2 It is a side view of the utility model;

[0024] Figure 3 It is a top view of the utility model;

[0025] Figure 4 This is a cross-sectional schematic diagram of a replaceable filter element of the utility model;

[0026] Description of reference numerals:

[0027] 1. Filter cartridge; 2. Filter cartridge cover; 3. Air inlet; 4. Air outlet; 5. Replaceable filter element; 6. Noise reduction material; 7. Pressure difference interface; 8. Vacuum pressure relief valve; 9. Negative pressure gauge interface; 10. Negative pressure transmitter interface; 11. Sealing plate; 12. Gas through hole; 13. Fixing plate; 14. Thread. DETAILED DESCRIPTION

[0028] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0029] Any feature disclosed in this specification (including any additional claims, abstracts and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0031] like Figures 1 to 4 As shown, a negative pressure screw fan filtering and silencing device comprises a filter cylinder 1, the cylinder is detachably provided with a filter cylinder cover 2, the side wall of the filter cylinder is provided with an air inlet 3 near the filter cylinder cover 2, the side wall of the filter cylinder is provided with an air outlet 4 away from the filter cylinder cover 2, and a replaceable filter element 5 is installed inside the filter cylinder 1 between the air inlet and the air outlet.

[0032] In this embodiment, the side wall of the filter cylinder 1 is filled with noise reduction material 6. The noise reduction material 6 is provided to reduce the noise of the negative pressure screw fan and reduce noise pollution.

[0033] In this embodiment, the air inlet 3 is provided with an air inlet flange, and the air outlet 4 is provided with an air outlet flange, which is convenient for installation.

[0034] In this embodiment, the air inlet flange and the air outlet flange are provided with a pressure difference interface 7 for installing a differential pressure switch, and whether the fan filter element needs to be replaced is judged according to the value of the pressure difference switch.

[0035] In this embodiment, if Figure 3 As shown, the filter cartridge cover 2 is connected to the filter cartridge body 1 via a thread 14, which facilitates the removal and replacement of the filter cartridge.

[0036] In this embodiment, a handle 21 is installed on the filter cartridge cover 2 to facilitate opening the filter cartridge cover.

[0037] In this embodiment, a sealing plate 11 for fixing a replaceable filter element 5 is installed on the inner wall of the filter cylinder 1, a gas through hole 12 is arranged at the center of the sealing plate, and a fixing plate 13 for fixing the replaceable filter element 5 is arranged at a circumferential position of the gas through hole 12 toward the filter cylinder cover 2.

[0038] In this embodiment, the replaceable filter element 5 is cylindrical, sealed at the top, the filtering material is fiber filter paper, and the bottom is clamped on the fixed plate 13. The gas can pass through the side wall of the replaceable filter element 5 to move to the gas hole 12, and then move to the outlet.

[0039] In this embodiment, a sealing ring is installed between the replaceable filter element 5 and the sealing plate 11 to prevent gas from reaching the gas through hole 12 from the gap between the replaceable filter element 5 and the sealing plate, thereby affecting the filtering efficiency.

[0040] In this embodiment, a vacuum relief valve 8 is further provided on the side wall of the filter cylinder 1. A negative pressure gauge interface 9 and a negative pressure transmitter interface 10 are also provided on the air outlet flange.

[0041] With this structure, the negative pressure safety of the inlet is protected according to the negative pressure transmitter signal and the vacuum relief valve.

[0042] Working principle: The device is installed at the air inlet of the negative pressure screw fan, and the gas enters the filter cylinder from the air inlet of the device. Since the top of the replaceable filter element 5 is sealed, and the bottom is sealed with the sealing plate and the fixed plate, the gas can only pass through the side wall of the replaceable filter element 5 (that is, the filter material) to reach the gas through hole 12. In this process, the replaceable filter element 5 whose filter material is fiber filter paper filters the gas, and the gas passes through the gas through hole 12 and then enters the negative pressure screw fan from the air outlet.

[0043] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0044] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A negative pressure screw fan filtering and silencing device, characterized in that: The invention comprises a filter cartridge (1), the cartridge being detachably provided with a filter cartridge cover (2), the side wall of the filter cartridge being provided with an air inlet (3) close to the filter cartridge cover (2), the side wall of the filter cartridge being provided with an air outlet (4) away from the filter cartridge cover (2), and a replaceable filter element (5) being installed inside the filter cartridge (1) between the air inlet and the air outlet.

2. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: The side wall of the filter cylinder (1) is filled with noise reduction material (6).

3. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: The air inlet (3) is provided with an air inlet flange, and the air outlet (4) is provided with an air outlet flange.

4. A negative pressure screw fan filtering and silencing device according to claim 3, characterized in that: The air inlet flange and the air outlet flange are provided with a pressure difference interface (7) for installing a differential pressure switch.

5. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: The filter cartridge cover (2) is connected to the filter cartridge body (1) via a thread (14).

6. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: A handle (21) is installed on the filter cartridge cover (2).

7. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: The inner wall of the filter cartridge (1) is provided with a sealing plate (11) for fixing a replaceable filter element (5), a gas through hole (12) is provided at the center of the sealing plate, and a fixing plate (13) for fixing the replaceable filter element (5) is provided on the sealing plate (11) at a circumferential position of the gas through hole (12) and facing the filter cartridge cover (2), the replaceable filter element (5) is in the shape of a column with the fixing plate (13) adapted at the bottom, the top sealed, and the side wall made of a filter material, and the height of the replaceable filter element (5) is higher than the fixing plate (13).

8. A negative pressure screw fan filtering and silencing device according to claim 6, characterized in that: A sealing ring is installed between the replaceable filter element (5) and the sealing plate (11).

9. A negative pressure screw fan filtering and silencing device according to claim 1, characterized in that: The side wall of the filter cylinder (1) is also provided with a vacuum pressure relief valve (8).

10. A negative pressure screw fan filtering and silencing device according to claim 3, characterized in that: The air outlet flange is also provided with a negative pressure gauge interface (9) and a negative pressure transmitter interface (10).

Images