Vacuum dust filter with pulse self-cleaning

Abstract

The utility model discloses a vacuum dust filter with pulse self -cleaning, including the casing, the inlet end of casing is connected with vacuum pipeline through the inlet flange intercommunication, the casing is connected with the filtering mechanism, and the filtering mechanism includes end housing and the end cap of being supported, be provided with filter core subassembly between end housing and end cap, the outside of filter core subassembly is provided with sealing assembly, be provided with vacuum gauge on the casing, the outlet side of casing is provided with pulse valve and pneumatic ball valve in proper order, the bottom of pulse valve is connected with nitrogen gas pipe. The utility model discloses through being provided with filter core subassembly with high accuracy grading filtration capacity, can high -efficiently intercept the dust of different particle size that pipe stove produces, especially fine dust, prevent its pollution and block pressure transmitter, ensure its measurement accuracy long -term stability, and filter screen can be through nitrogen pulse purging reuse, reduce the replacement cost, guarantee the filtration effect, improve the continuity of pipe stove operation.

Description

Technical Field

[0001] This utility model relates to the field of vacuum filtration equipment technology, specifically to a vacuum dust filter with pulse self-cleaning function. Background Technology

[0002] In vacuum piping systems of equipment such as tube furnaces in industrial production, pressure transmitters are key components for monitoring system pressure parameters, and their measurement accuracy directly affects the operation control and safety assurance of the entire system. However, tube furnaces generate a large amount of dust during operation, which flows with the airflow in the vacuum piping and can easily contaminate and clog the pressure transmitters located in the piping.

[0003] The shortcomings of existing technologies are as follows: To protect pressure transmitters from dust contamination, the common practice is to install simple filtration devices, such as single-layer metal mesh filters or simple filter screens, at the front end of the pressure transmitter. These devices have low filtration accuracy and cannot effectively intercept fine dust generated by the tube furnace. This fine dust will adhere to the sensing element of the pressure transmitter, causing contamination and affecting its measurement accuracy. The filter element is easily clogged by dust, and there is no convenient way to clean and replace it. Frequent shutdowns are required for disassembly, cleaning, or replacement, which not only increases the workload and cost of maintenance but also affects the continuous and stable operation of the tube furnace. In addition, existing filtration devices cannot automatically clean themselves according to the system status, which may result in failure to clean in time before the pressure transmitter is affected by contamination, further exacerbating the problem. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum dust filter with pulse self-cleaning function to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum dust filter with pulse self-cleaning, comprising a housing, the inlet end of which is connected to a vacuum pipe via an inlet flange, a filter mechanism connected to the housing, the filter mechanism comprising an end shell and a matching end cap, a filter element assembly disposed between the end shell and the end cap, and a sealing assembly disposed outside the filter element assembly; a vacuum gauge disposed on the housing, a pulse valve and a pneumatic ball valve sequentially connected to the outlet side of the housing, a nitrogen gas pipe connected to the bottom of the pneumatic ball valve, and a pressure regulating valve disposed between the pulse valve and the pneumatic ball valve.

[0006] As a further description of the above technical solution:

[0007] The filter element assembly includes a filter element frame disposed in an end shell, and multiple sets of filter screens with progressively decreasing pore sizes are sequentially arranged in the filter element frame.

[0008] As a further description of the above technical solution:

[0009] The filter screen can be made of sintered steel plate mesh, and multiple filter screens adopt a disc design.

[0010] As a further description of the above technical solution:

[0011] The sealing assembly includes an inner inclined sealing ring disposed on the end cap, one end of the filter element frame is configured as an inclined surface to fit the inner inclined sealing ring, and a reinforcing sealing ring is fixedly connected to the other end of the filter element frame.

[0012] As a further description of the above technical solution:

[0013] The end shell is slidably connected to the housing, and a compression sealing ring is provided at the end where the housing and the end shell are slidably connected.

[0014] As a further description of the above technical solution:

[0015] The end shell has multiple limiting rods fixedly connected inside in a ring array, and the filter frame is slidably sleeved on the multiple limiting rods.

[0016] As a further description of the above technical solution:

[0017] The housing has a hollow cylindrical structure, and a controller is also provided on the housing for controlling the pulse valve.

[0018] In the above technical solution, the vacuum dust filter with pulse self-cleaning provided by this utility model has the following beneficial effects:

[0019] This invention utilizes a filter element assembly with high-precision graded filtration capabilities to efficiently intercept dust of different particle sizes generated by the tube furnace, especially fine dust, preventing it from contaminating and clogging the pressure transmitter. This ensures long-term stability of the measurement accuracy. Furthermore, the filter screen in the filter element mechanism adopts a sintered metal mesh structure, which is high in strength, wear-resistant, and corrosion-resistant. Its disc design increases the filtration area, reduces the probability of clogging, and ensures long-term stable filtration, guaranteeing continuous protection for the pressure transmitter. Moreover, the filter element assembly can be quickly replaced by opening the end cover, reducing downtime for maintenance. The filter screen can also be reused by nitrogen pulse purging, reducing replacement costs, ensuring filtration effect, and improving the continuity of tube furnace operation.

[0020] Good adaptability: The stainless steel material and nitrogen purging are suitable for high-temperature and potentially corrosive environments in tube furnaces, ensuring long-term reliable operation of the filter.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0022] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0025] Figure 2 This is a partial longitudinal section schematic diagram of an embodiment of the present utility model;

[0026] Figure 3-4 This is a partial structural exploded view provided for an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Housing; 2. Inlet flange; 3. Vacuum pipe; 4. End shell; 5. End cover; 6. Vacuum gauge; 7. Pulse valve; 8. Pneumatic ball valve; 9. Nitrogen pipe; 10. Pressure regulating valve; 11. Filter frame; 12. Filter screen; 13. Inner bevel sealing ring; 14. Reinforced sealing ring; 15. Compression sealing ring; 16. Limiting rod. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] Please see Figure 1-4This embodiment provides a vacuum dust filter with pulse self-cleaning, including a housing 1. The housing 1 has a hollow cylindrical structure and is made of corrosion-resistant stainless steel. The inlet end of the housing 1 is connected to a vacuum pipe 3 via an inlet flange 2. One end of the housing 1 is the inlet, connected to the vacuum pipe 3 of the tube furnace via the inlet flange 2, and the other end is the outlet, connected to a pressure transmitter via an outlet flange. A filter mechanism is connected to the housing 1, including an end shell 4 and a matching end cover 5. The end shell 4 and the housing 1 are connected by a threaded connection structure, which facilitates the opening of the end cover 5 to replace the filter element assembly. A filter element assembly is disposed between the end shell 4 and the end cover 5, and a sealing component is disposed on the outside of the filter element assembly of the housing 1. The filter mechanism is located between the inlet and the outlet, closer to the inlet side. The pressure transmitter ensures that the clean gas filtered by the filtration mechanism flows to the outlet end. A vacuum gauge 6 is installed on the housing 1. A pulse valve 7 and a pneumatic ball valve 8 are connected sequentially to the outlet side of the housing 1. A nitrogen gas pipe 9 is connected to the bottom of the pulse valve 7. A pressure regulating valve 10 is installed between the pulse valve 7 and the pneumatic ball valve 8. A controller is also installed on the housing 1 to control the pulse valve 7. The nitrogen gas pipe is connected to the on-site nitrogen gas source. The pressure regulating valve 10 is used to regulate the nitrogen pressure. The pulse valve 7 controls the pulse output of nitrogen and is located at the rear end of the filter element assembly (close to the pressure transmitter). Its spray direction is towards the filter element assembly, and its shape is adapted to the filter element assembly to evenly purge the rear end of the filter element assembly. The pressure regulating valve 10 can also monitor the negative pressure data of the gas before entering the pressure transmitter. The controller adopts a PLC controller, which presets the negative pressure threshold and purging cycle and receives data. When the negative pressure reaches the set value, it controls the pulse valve 7 to open and perform periodic automatic purging.

[0031] In a further embodiment of this utility model, the filter element assembly includes a filter element frame 11 disposed in the end shell 4. Multiple sets of filter screens 12 with progressively decreasing pore sizes are sequentially disposed in the filter element frame 11. The filter screens 12 can be made of sintered steel mesh. All filter screens 12 are disc-shaped. The filter screens 12 in the filter element frame 11 are composited from 3-5 layers of metal mesh with different mesh sizes through a sintering process. From the inlet side to the outlet side (i.e., the side facing the pressure transmitter), the mesh size of the metal mesh increases sequentially. The outermost layer (inlet side) is a coarser mesh to intercept large particles of furnace dust; the middle layers are medium-mesh meshes to filter medium-sized dust particles; and the innermost layer (outlet side, near the pressure transmitter) is a fine-mesh mesh to effectively block fine dust and prevent it from reaching the pressure transmitter.

[0032] In a further embodiment of this utility model, the sealing assembly includes an inner inclined sealing ring 13 disposed on the end cover 5, one end of the filter element frame 11 is configured as an inclined surface to match the inner inclined sealing ring 13, and the other end of the filter element frame 11 is fixedly connected to a reinforcing sealing ring 14. The end shell 4 is slidably connected to the housing 1, and the end of the housing 1 and the end shell 4 are provided with a compression sealing ring 15. By setting the inner inclined sealing ring 13, the reinforcing sealing ring 14 and the compression sealing ring 15, the sealing performance of the entire equipment can be ensured, ensuring that the tube furnace gas must be filtered by the filter screen 12 before flowing to the pressure transmitter, and preventing the leakage of unfiltered gas.

[0033] In the embodiments provided by this utility model, a plurality of limiting rods 16 arranged in a ring array are fixedly connected inside the end shell 4, and the filter frame 11 is slidably sleeved on the plurality of limiting rods 16.

[0034] Working principle: The dust-laden gas generated by the tube furnace enters the shell 1 from the inlet flange 2 and is filtered in the multi-layer filter screen 12. Large dust particles are intercepted by the outer coarse mesh filter screen 12, while medium and fine dust particles are filtered by the middle and inner filter screens 12 respectively, to prevent dust pollution in the pipeline from clogging the pressure transmitter and to ensure that the gas in contact with the pressure transmitter is free from dust pollution.

[0035] When the filter element assembly needs to be replaced, simply open the snap fastener of the quick-opening end cover 5, remove the filter element frame 11, insert the new filter element frame 11, and then fasten the end cover 5. The operation is quick and reduces downtime.

[0036] As dust accumulates on filter 12 with use, it causes changes in the pressure difference across filter 12. When the negative pressure inside housing 1 reaches the controller's preset value, the controller activates pulse valve 7 to use nitrogen to purge and clean the system. After pressure regulation, nitrogen is sprayed from the purge head through pulse valve 7 in the form of pulses with a set frequency and width to purge the rear end of filter 12. Under the negative pressure of the system, the dust on filter 12 is blown off and sucked out from the inlet side with the airflow, thus cleaning filter 12. After cleaning is completed, pulse valve 7 closes, and the filter continues to filter efficiently, protecting the pressure transmitter from dust contamination and clogging, and ensuring its measurement accuracy.

[0037] The above 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 vacuum dust filter with pulse self-cleaning function, comprising a housing (1), wherein the inlet end of the housing (1) is connected to a vacuum pipe (3) via an inlet flange (2), characterized in that: The housing (1) is connected to a filter mechanism, which includes an end shell (4) and a matching end cap (5). A filter element assembly is provided between the end shell (4) and the end cap (5), and a sealing assembly is provided on the outside of the filter element assembly. A vacuum gauge (6) is provided on the housing (1). A pulse valve (7) and a pneumatic ball valve (8) are connected in sequence at the outlet side of the housing (1). A nitrogen gas pipe (9) is connected to the bottom of the pneumatic ball valve (8). A pressure regulating valve (10) is provided between the pulse valve (7) and the pneumatic ball valve (8).

2. A vacuum dust filter with pulse self-cleaning according to claim 1, characterized in that, The filter element assembly includes a filter element frame (11) disposed in the end shell (4), and multiple sets of filter screens (12) with progressively decreasing pore sizes are sequentially disposed in the filter element frame (11).

3. A vacuum dust filter with pulse self-cleaning according to claim 2, characterized in that, The filter screen (12) can be made of sintered steel mesh, and multiple filter screens (12) are designed in a disc shape.

4. A vacuum dust filter with pulse self-cleaning according to claim 2, characterized in that, The sealing assembly includes an inner inclined sealing ring (13) disposed on the end cap (5), one end of the filter frame (11) is configured as an inclined surface to match the inner inclined sealing ring (13), and the other end of the filter frame (11) is fixedly connected to a reinforcing sealing ring (14).

5. A vacuum dust filter with pulse self-cleaning according to claim 1, characterized in that, The end shell (4) is slidably connected to the housing (1), and the end of the housing (1) and the end shell (4) that are slidably connected is provided with a compression sealing ring (15).

6. A vacuum dust filter with pulse self-cleaning according to claim 2, characterized in that, The end shell (4) is internally fixedly connected with a plurality of limiting rods (16) arranged in a ring array, and the filter frame (11) is slidably sleeved on the plurality of limiting rods (16).

7. A vacuum dust filter with pulse self-cleaning according to claim 1, characterized in that, The housing (1) has a hollow cylindrical structure and a controller is also provided on the housing (1) for controlling the pulse valve (7).

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