Gas filtering device capable of automatically replacing filter membrane

Abstract

The invention discloses a gas filtering device capable of automatically replacing a filter membrane, and relates to the technical field of automatic filter membrane replacement, the gas filtering device comprises a shell, the shell is a hollow box body structure, a lead screw motor and a lower filter box are arranged in the shell, and the lower part of the lead screw motor is connected with a lead screw nut through a thread on the surface of a lead screw; the lead screw motor is connected with the upper filter box through a lead screw nut and drives the upper filter box to move up and down, a driving wheel is rotationally installed in the shell, and a driver is arranged at one end of the driving wheel. When an external system gives a membrane replacement instruction, the lead screw motor drives the upper filter box to move upwards, separate from the lower filter box, drive the upper filter box to rotate and drive the filter membrane to move, and after the filter membrane is moved and replaced successfully, the lead screw motor drives the upper filter box to move downwards and press and seal the lower filter box, and then the filter membrane is automatically replaced. And the required frequency of replacing the filtering film by workers on site is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automatic filter membrane replacement, and in particular to a gas filter device for automatically replacing filter membranes. Background Art

[0002] Air quality monitoring station, also known as air station. The function of the air station is to sample, measure and analyze pollutants in the atmosphere and air at fixed points, continuously or regularly. In order to monitor the air, several air stations are generally set up in a key environmental protection city. Multi-parameter automatic monitoring instruments are installed in the station for continuous automatic monitoring. The monitoring results are stored in real time and analyzed to obtain relevant data. The air quality monitoring station is the basic platform for air quality control and reasonable evaluation of air quality, and is an infrastructure for urban air environment protection.

[0003] The filter membrane of the automatic ambient air monitoring station needs to be replaced once a week, while the filter membranes of most automatic ambient air monitoring systems on the market are manually replaced, that is, each station needs to be maintained on site more than 50 times a year, which requires a huge investment of manpower and material resources. Therefore, we propose a gas filtration device that automatically replaces the filter membrane. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a gas filtering device with automatic filter membrane replacement, which solves the technical problem of automatic filter membrane replacement.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A gas filtering device for automatically replacing filter membranes, comprising

[0009] The outer shell is a hollow box structure.

[0010] A lead screw motor and a lower filter box are arranged in the shell. The lead screw nut is connected to the lead screw surface through a thread below the lead screw motor. The lead screw motor is connected to the upper filter box through the lead screw nut. The upper filter box is slidably installed on the inner side of the shell through a guide rail and drives the upper filter box to move up and down.

[0011] Preferably, a driving wheel is rotatably installed inside the shell, one end of the driving wheel is provided with a drive, and the driving wheel is driven to rotate synchronously by the driving rotation, and the driven wheel is fixedly installed on the shell.

[0012] Preferably, a first guide rail, a second guide rail and a friction wheel are arranged in the housing, wherein a filter membrane is wound around the outside of the driving wheel and the driven wheel, and the filter membrane also passes through the first guide rail, the second guide rail and the friction wheel between the driving wheel and the driven wheel.

[0013] The beginning of the filter membrane passes through the lower part of the friction wheel, the upper part of the first guide rail, and the lower part of the second guide rail in turn, and is fixed on the driving wheel shaft, and is collected on the driving wheel shaft as the driving wheel rotates.

[0014] Preferably, a counting light wheel is provided at the end of the friction wheel, and the counting light wheel rotates synchronously with the friction wheel. A photoelectric detector is provided on the outer shell, and the photoelectric detector is used to detect the rotation angle of the counting light wheel, so as to measure the rotation angle of the friction wheel and indirectly measure the replacement length of the filter membrane accordingly.

[0015] Preferably, a driver is arranged on the upper part of the shell, and a control board is arranged on the inner side of the shell, wherein the driver and the drive are controlled by the control board, the detection signal of the photoelectric detector is uploaded to the control board, and the control board is connected to the external control system.

[0016] Preferably, when the external system gives a membrane replacement instruction, the screw motor drives the upper filter box to move upward and separate from the lower filter box, and drives the rotation to drive the filter membrane to move. After the filter membrane is successfully shifted and replaced, the control board feeds back the signal to the external control system, and the screw motor drives the upper filter box to move downward and press and seal with the lower filter box, and the filter membrane is automatically replaced.

[0017] Preferably, the lower part of the friction wheel should be lower than the lower part of the first guide rail, and the upper part of the first guide rail should not be lower than the upper part of the second guide rail; the roughness of the friction wheel surface is set according to the specifications of the filter membrane, and it should be ensured that the friction wheel can rotate synchronously with the movement of the filter membrane without damaging the filter membrane; the surfaces of the first guide rail and the second guide rail can be smooth or rough.

[0018] Preferably, the upper filter box is provided with an air inlet interface and an air inlet cavity, which are used for air in and out respectively, and the lower filter box is provided with an air outlet cavity and an air outlet interface, which are used for air outlet, wherein the air outlet interface is connected to an air pump or instrument with a vacuum function, and the upper filter box is connected to the outside through the air inlet interface to form air flow, so as to filter the airflow through the filter membrane sandwiched in the middle, and a filter membrane support structure is provided in the middle of the lower filter box to provide support for the filter membrane.

[0019] Preferably, a lower sealing ring and an upper sealing ring are respectively provided on opposite sides of the upper filter box and the lower filter box. The lower sealing ring and the upper sealing ring have a smooth surface on one side and a plurality of micro-raised rings on the other side. The lower sealing ring and the upper sealing ring can be slightly deformed under the action of external force and are used to seal the air inlet cavity and the air outlet cavity.

[0020] Preferably, a buffer structure is provided in the middle of the connection between the lower filter box and the outer shell. The buffer structure may be a spring or a buffer pad, which is used to buffer the excessive pressure provided by the screw motor to protect the filter membrane.

[0021] Preferably, the number and size of the screw motor, the upper filter box, and the lower filter box are not limited; the number of the air outlet interfaces of the lower filter box is not limited.

[0022] (III) Beneficial effects

[0023] 1. The photoelectric detector is used to detect the rotation angle of the counting light wheel, so as to measure the rotation angle of the friction wheel, and the corresponding indirect measurement of the filter membrane replacement length. When the external system gives a membrane replacement instruction, the screw motor drives the upper filter box to move upward, separate from the lower filter box, drive the rotation, and drive the filter membrane to move. After the filter membrane is successfully shifted and replaced, the screw motor drives the upper filter box to move downward and press and seal with the lower filter box, and then the filter membrane is automatically replaced.

[0024] 2. When the external system gives a membrane replacement instruction, the screw motor drives the upper filter box to move upward and separate from the lower filter box, drives it to rotate, and drives the filter membrane to move. After the filter membrane is successfully shifted and replaced, the screw motor drives the upper filter box to move downward and presses and seals it with the lower filter box. After completion, the filter membrane is automatically replaced. The purpose of the present invention is to provide an automatic ambient air monitoring system with a device that can automatically switch the filter membrane, thereby reducing the frequency of the need for staff to go to the site to replace the filter membrane. The device realizes the function of regular and automatic replacement of the filter membrane through automatic control, so as to reduce the frequency of the need for operation and maintenance personnel to go to the site to replace the filter membrane and reduce the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0026] Figure 1 The overall structure of a gas filtering device for automatically replacing filter membranes according to the present invention Figure 1 ;

[0027] Figure 2 The overall structure of a gas filtering device for automatically replacing filter membranes according to the present invention Figure 2 ;

[0028] Figure 3 The present invention is a structural diagram of a lower filter box in a gas filtering device for automatically replacing filter membranes.

[0029] Legend: 1. Housing; 2. Screw motor; 3. Screw nut; 4. Driver; 5. Drive; 6. Driving wheel; 7. Driven wheel; 8. First guide rail; 9. Second guide rail; 10. Friction wheel; 11. Photoelectric detector; 12. Counting light wheel; 13. Upper filter box; 14. Lower filter box; 15. Filter membrane; 16. Control board; 17. Air inlet interface; 18. Air inlet cavity; 19. Filter membrane support structure; 20. Air outlet cavity; 21. Air outlet interface; 22. Lower sealing ring; 23. Upper sealing ring; 24. Buffer structure. DETAILED DESCRIPTION

[0030] The embodiment of the present application solves the problem of automatic replacement of filter membranes in automatic environmental air monitoring equipment in the prior art by providing a gas filtering device that can automatically replace filter membranes. The screw motor drives the upper filter box to move upward and separate from the lower filter box, and drives the filter membrane to rotate, driving the filter membrane to move. After the filter membrane is successfully shifted and replaced, the screw motor drives the upper filter box to move downward and press and seal with the lower filter box, completing the automatic replacement of the filter membrane.

[0031] Example 1

[0032] The embodiment of the present application is about the problem of automatic replacement of filter membrane of automatic ambient air monitoring equipment. The overall idea is as follows:

[0033] like Figure 1 As shown, in view of the problems existing in the prior art, the present invention provides a gas filtering device for automatically replacing filter membranes, comprising a housing 1, wherein the housing 1 is a hollow box structure.

[0034] A lead screw motor 2 and a lower filter box 14 are arranged in the housing 1, and a lead screw nut 3 is connected to the lead screw surface below the lead screw motor 2, and the lead screw motor 2 is connected to the upper filter box 13 through the lead screw nut 3, wherein the upper filter box 13 is slidably installed on the inner side of the housing 1 through a guide rail, and drives the upper filter box 13 to move up and down.

[0035] A driving wheel 6 is rotatably mounted inside the housing 1 . A driving wheel 5 is disposed at one end of the driving wheel 6 . The driving wheel 5 rotates to drive the driving wheel 6 to rotate synchronously. The driven wheel 7 is fixedly mounted on the housing 1 .

[0036] The housing 1 is provided with a first guide rail 8, a second guide rail 9 and a friction wheel 10, wherein a filter membrane 15 is wound around the outside of the driving wheel 6 and the driven wheel 7, and the filter membrane 15 also passes through the first guide rail 8, the second guide rail 9 and the friction wheel 10 between the driving wheel 6 and the driven wheel 7.

[0037] The beginning of the filter membrane 15 passes through the lower part of the friction wheel 10, the upper part of the first guide rail 8, and the lower part of the second guide rail 9 in sequence, and is fixed on the shaft of the driving wheel 6, and is collected on the shaft of the driving wheel 6 as the driving wheel 6 rotates.

[0038] like Figure 2-3 As shown, the upper filter box 13 is provided with an air inlet interface 17 and an air inlet cavity 18, which are used for air inlet and outlet, respectively; the lower filter box 14 is provided with an air outlet cavity 20 and an air outlet interface 21, which are used for air outlet, wherein the air outlet interface 21 is connected to an air pump or instrument with an air extraction function; the upper filter box 13 is connected to the outside through the air inlet interface 17 to form an air flow, and the filter membrane 15 sandwiched in the middle is subjected to air flow filtering; a filter membrane support structure 19 is provided in the middle of the lower filter box 14 to provide support for the filter membrane 15;

[0039] The upper filter box 13 and the lower filter box 14 are provided with a lower sealing ring 22 and an upper sealing ring 23 on opposite sides thereof, and the lower sealing ring 22 and the upper sealing ring 23 are smooth on one side and provided with a plurality of micro-protrusion rings on the other side. The lower sealing ring 22 and the upper sealing ring 23 are made of a material that can be slightly deformed under the action of an external force, and are used to seal the air inlet cavity 18 and the air outlet cavity 20;

[0040] A buffer structure 24 is provided in the middle of the connection between the lower filter box 14 and the housing 1 . The buffer structure 24 may be a spring or a buffer pad, and is used to buffer the excessive pressure provided by the screw motor 2 to protect the filter membrane 15 .

[0041] The number and size of the screw motor 2, the upper filter box 13, and the lower filter box 14 are not limited; the number of the air outlet interfaces 21 of the lower filter box 14 is not limited.

[0042] Example 2

[0043] On the basis of Example 1, the prior art in the examples of the present application does not set a calculation and feedback method for the moving length of the filter membrane. The moving speed of the filter paper is inconsistent with the rotation of the motor in the early and late stages of use. In the early stage, the paper collecting wheel has no filter membrane, and the length of the filter membrane is short when it rotates one circle. In the later stage, the paper collecting wheel has a filter membrane, and the moving length of the filter membrane is long when the paper collecting wheel rotates one circle. In actual use, there is a phenomenon of uneven replacement of the filter paper, and the length of the filter paper roll is inconsistent during actual use. It is difficult to control the moving length of the filter membrane by calculation. The overall idea is as follows:

[0044] A counting light wheel 12 is provided at the end of the friction wheel 10, and the counting light wheel 12 rotates synchronously with the friction wheel 10. A photoelectric detector 11 is provided on the housing 1, and the photoelectric detector 11 is used to detect the rotation angle of the counting light wheel 12, so as to measure the rotation angle of the friction wheel 10 and indirectly measure the replacement length of the filter membrane 15 accordingly.

[0045] A driver 4 is arranged on the upper part of the housing 1, and a control board 16 is arranged on the inner side of the housing 1, wherein the driver 4 and the driver 5 are controlled by the control board 16, and the detection signal of the photodetector 11 is uploaded to the control board 16, and the control board 16 is connected to an external control system.

[0046] During use, when the external system gives a membrane replacement instruction, the screw motor 2 drives the upper filter box 13 to move upward and separate from the lower filter box 14, and the drive 5 rotates to drive the filter membrane 15 to move. After the filter membrane 15 is successfully shifted and replaced, the screw motor 2 drives the upper filter box 13 to move downward and press and seal with the lower filter box 14. After that, the filter membrane 15 is automatically replaced.

[0047] The lower part of the friction wheel 10 should be lower than the lower part of the first guide rail 8, and the upper part of the first guide rail 8 should not be lower than the upper part of the second guide rail 9; the roughness of the surface of the friction wheel 10 is set according to the specifications of the filter membrane 15, and it should be ensured that the friction wheel 10 can rotate synchronously with the movement of the filter membrane 15 without damaging the filter membrane 15; the surfaces of the first guide rail 8 and the second guide rail 9 can be smooth or rough.

[0048] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A gas filtering device with automatic filter membrane replacement, comprising a housing (1), characterized in that: The outer shell (1) is a hollow box structure. A screw motor (2) and a lower filter box (14) are arranged in the housing (1); a screw nut (3) is connected to the lower portion of the screw motor (2) via a thread on the surface of a screw; the screw motor (2) is connected to an upper filter box (13) via the screw nut (3); the upper filter box (13) is slidably mounted on the inner side of the housing (1) via a guide rail, and drives the upper filter box (13) to move up and down.

2. A gas filtration device with automatic filter membrane replacement as claimed in claim 1, characterized in that: A driving wheel (6) is rotatably mounted inside the housing (1), and a drive (5) is provided at one end of the driving wheel (6). The driving wheel (6) is driven to rotate synchronously by the rotation of the drive (5), and the driven wheel (7) is fixedly mounted on the housing (1).

3. A gas filtration device with automatic filter membrane replacement as claimed in claim 2, characterized in that: A first guide rail (8), a second guide rail (9) and a friction wheel (10) are arranged in the housing (1), wherein a filter membrane (15) is wound around the outside of the driving wheel (6) and the driven wheel (7), and the filter membrane (15) also passes through the first guide rail (8), the second guide rail (9) and the friction wheel (10) between the driving wheel (6) and the driven wheel (7). The beginning of the filter membrane (15) passes through the lower part of the friction wheel (10), the upper part of the first guide rail (8), and the lower part of the second guide rail (9) in sequence, and is then fixed on the shaft of the driving wheel (6), and is collected on the shaft of the driving wheel (6) as the driving wheel (6) rotates.

4. A gas filtering device with automatic filter membrane replacement as claimed in claim 3, characterized in that: A counting light wheel (12) is arranged at the end of the friction wheel (10), and the counting light wheel (12) rotates synchronously with the friction wheel (10). A photoelectric detector (11) is arranged on the housing (1).

5. A gas filtering device with automatic filter membrane replacement as claimed in claim 1, characterized in that: A driver (4) is arranged at the upper part of the housing (1), and a control board (16) is arranged at the inner side of the housing (1), wherein the driver (4) and the drive (5) are controlled by the control board (16), and the detection signal of the photoelectric detector (11) is uploaded to the control board (16).

6. A gas filtering device with automatic filter membrane replacement as claimed in claim 3, characterized in that: The lower part of the friction wheel (10) should be lower than the lower part of the first guide rail (8), and the upper part of the first guide rail (8) should not be lower than the upper part of the second guide rail (9); the roughness of the surface of the friction wheel (10) is set according to the specifications of the filter membrane (15); the surfaces of the first guide rail (8) and the second guide rail (9) can be smooth or rough.

7. A gas filtering device with automatic filter membrane replacement as claimed in claim 1, characterized in that: The upper filter box (13) is provided with an air inlet interface (17) and an air inlet cavity (18), the lower filter box (14) is provided with an air outlet cavity (20) and an air outlet interface (21), and a filter membrane support structure (19) is provided in the middle of the lower filter box (14).

8. A gas filtering device with automatic filter membrane replacement as claimed in claim 7, characterized in that: A lower sealing ring (22) and an upper sealing ring (23) are respectively arranged on opposite sides of the upper filter box (13) and the lower filter box (14); one side of the lower sealing ring (22) and the upper sealing ring (23) is a smooth surface, and the other side is provided with a plurality of micro-protrusion rings; the lower sealing ring (22) and the upper sealing ring (23) are made of a material that can be slightly deformed under the action of an external force.

9. A gas filtering device with automatic filter membrane replacement as claimed in claim 8, characterized in that: A buffer structure (24) is provided in the middle of the connection between the lower filter box (14) and the outer shell (1), and the buffer structure (24) is one of a spring and a buffer pad.

10. A gas filtering device with automatic filter membrane replacement as claimed in claim 1, characterized in that: The number and size of the screw motor (2), the upper filter box (13), and the lower filter box (14) are not limited; the number of the air outlet interfaces (21) of the lower filter box (14) is not limited.

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