Automatic switching double-filter-element device

Abstract

The utility model belongs to the technical field of crystalline silicon battery production, and particularly relates to an automatic switching double-filter-element device which comprises an air inlet pipe, a filter element, a filter element and a control device, wherein the air inlet pipe is communicated with an air outlet of a diffusion furnace; the exhaust pipe is communicated with external negative pressure suction equipment; the head end of the first filtering assembly is communicated with the air inlet pipe, the tail end of the first filtering assembly is communicated with the exhaust pipe, the first filtering assembly comprises a first valve communicated with the air inlet pipe, and the first valve is communicated with a filter which is communicated with the exhaust pipe; the head end of the second filtering assembly communicates with the air inlet pipe, the tail end of the second filtering assembly communicates with the exhaust pipe, and the second filtering assembly and the first filtering assembly are the same in structure and are arranged in parallel. By switching the blocked filters, the problem of process failure caused by blockage of the filters in the low-pressure diffusion process is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of crystalline silicon battery production, and particularly relates to an automatically switched double-filter device. Background Art

[0002] In the prior art, in the production process of crystalline silicon cells, the diffusion process is basically low-pressure diffusion, and the low-pressure diffusion process requires a diaphragm pump to achieve negative pressure in the diffusion furnace, and a filter element is required to filter the exhaust gas generated by the reaction in the diffusion furnace to prevent the byproducts of the reaction from clogging the diaphragm pump. However, when the filter is clogged, the pressure of the furnace tube cannot be pumped to the negative pressure required by the process, resulting in process failure. Therefore, an automatically switching dual filter element device is urgently needed. Utility Model Content

[0003] The utility model aims to provide an automatically switched double filter element device to solve the above problems.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] An automatically switching dual filter element device, comprising:

[0006] An air inlet pipe connected to an air outlet of the diffusion furnace;

[0007] The suction pipe is connected to the external negative pressure suction equipment;

[0008] A first filter assembly, the head end of which is connected to the air inlet pipe, and the tail end of which is connected to the air extraction pipe, the first filter assembly includes a first valve connected to the air inlet pipe, the first valve is connected to a filter, and the filter is connected to the air extraction pipe;

[0009] The second filter assembly has a head end connected to the air inlet pipe and a tail end connected to the air extraction pipe. The second filter assembly has the same structure as the first filter assembly and is arranged in parallel.

[0010] Preferably, the filter comprises:

[0011] A cover body, an air inlet connecting pipe and an air outlet connecting pipe are fixedly connected and connected to the outer wall of the cover body, and the air inlet connecting pipe and the air outlet connecting pipe are centrally symmetrically arranged;

[0012] A housing, threadedly connected to the lower side of the cover;

[0013] A cylindrical filter element is arranged in the shell, a gap is left between the cylindrical filter element and the shell, the gap is communicated with the air inlet connecting pipe, and the inner cavity of the cylindrical filter element is communicated with the air outlet connecting pipe.

[0014] Preferably, an abutment block is fixedly connected to the inner top wall of the cover body, the abutment block is coaxially arranged with the cover body, the bottom wall of the abutment block abuts against the top end of the cylindrical filter element, an air outlet cavity is opened in the abutment block, one end of the air outlet cavity is connected with the inner cavity of the cylindrical filter element, and the other end of the air outlet cavity is connected with the air outlet connecting pipe through a connecting pipe.

[0015] Preferably, an upper positioning block is coaxially fixed to the bottom end of the abutment block, a through hole is formed on the upper positioning block, the through hole is communicated with one end of the air outlet cavity, and the upper positioning block extends into the inner cavity of the cylindrical filter element and is communicated with the inner cavity of the cylindrical filter element;

[0016] A lower positioning block is fixedly connected to the inner bottom wall of the shell, and the lower positioning block extends into the inner cavity of the cylindrical filter element.

[0017] Preferably, a limiting ring is circumferentially fixedly connected to the outer wall of the shell, the limiting ring is located at the upper part of the shell, and the top surface of the limiting ring abuts against the cover body.

[0018] Preferably, a sealing gasket is sleeved on the outer side of the shell, and the sealing gasket is located between the limiting ring and the cover body.

[0019] Compared with the prior art, the utility model has the following advantages and technical effects:

[0020] When the utility model is in use, the first valve of the first filter component is opened, and the first valve of the second filter component is closed, and the gas is sucked away by the external negative pressure suction equipment through the first filter component, so that the negative pressure in the diffusion furnace is maintained; when it is monitored that the negative pressure in the diffusion furnace is reduced to exceed the warning value, it is determined that the filter of the first filter component is clogged, the first valve of the first filter component is closed, and the first valve of the second filter component is opened, and the gas is sucked away by the external negative pressure suction equipment through the second filter component, so that the negative pressure in the diffusion furnace is maintained. After use, the staff can replace the clogged filter.

[0021] The utility model effectively avoids the problem of process failure caused by filter blockage in the low-pressure diffusion process by switching the blocked filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the filter in the utility model;

[0025] Among them, 1. exhaust pipe; 2. air inlet pipe; 3. first valve; 5. filter; 501. cover body; 502. air inlet connecting pipe; 503. abutment block; 504. sealing gasket; 505. limiting ring; 506. air outlet connecting pipe; 507. connecting pipe; 508. air outlet cavity; 509. upper positioning block; 510. cylindrical filter element; 511. shell; 512. lower positioning block; 513. gap. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Reference Figure 1 to Figure 2 The utility model discloses an automatic switching double filter element device, comprising:

[0029] An air inlet pipe 2 is connected to the air outlet of the diffusion furnace;

[0030] The suction pipe 1 is connected to the external negative pressure suction equipment;

[0031] A first filter assembly, the head end of which is connected to the air inlet pipe 2, and the tail end of which is connected to the air extraction pipe 1. The first filter assembly includes a first valve 3 connected to the air inlet pipe 2, the first valve 3 is connected to a filter 5, and the filter 5 is connected to the air extraction pipe 1;

[0032] The second filter assembly has a head end connected to the air inlet pipe 2 and a tail end connected to the air extraction pipe 1. The second filter assembly has the same structure as the first filter assembly and is arranged in parallel.

[0033] When the utility model is in use, the first valve 3 of the first filter component is opened, and the first valve 3 of the second filter component is closed, and the gas is sucked away by the external negative pressure suction device through the first filter component, so that the negative pressure in the diffusion furnace is maintained; when it is monitored that the negative pressure in the diffusion furnace is reduced to exceed the warning value, it is determined that the filter 5 of the first filter component is blocked, the first valve 3 of the first filter component is closed, and the first valve 3 of the second filter component is opened, and the gas is sucked away by the external negative pressure suction device through the second filter component, so that the negative pressure in the diffusion furnace is maintained. After use, the staff can replace the blocked filter 5.

[0034] The utility model effectively avoids the problem of process failure caused by filter blockage in the low-pressure diffusion process by switching the blocked filter.

[0035] Further optimizing the scheme, filter 5 includes:

[0036] A cover body 501, an air inlet connecting pipe 502 and an air outlet connecting pipe 506 are fixedly connected and connected to the outer wall of the cover body 501, and the air inlet connecting pipe 502 and the air outlet connecting pipe 506 are centrally symmetrically arranged;

[0037] The housing 511 is threadedly connected to the bottom of the cover 501;

[0038] The cylindrical filter element 510 is disposed in the housing 511 , with a gap 513 being left between the cylindrical filter element 510 and the housing 511 , the gap 513 being connected to the air inlet connecting pipe 502 , and the inner cavity of the cylindrical filter element 510 being connected to the air outlet connecting pipe 506 .

[0039] To further optimize the solution, an abutment block 503 is fixed to the inner top wall of the cover body 501, the abutment block 503 is coaxially arranged with the cover body 501, the bottom wall of the abutment block 503 abuts against the top of the cylindrical filter element 510, an air outlet cavity 508 is opened in the abutment block 503, one end of the air outlet cavity 508 is connected to the inner cavity of the cylindrical filter element 510, and the other end of the air outlet cavity 508 is connected to the air outlet connecting pipe 506 through a connecting pipe 507.

[0040] Further optimizing the scheme, the bottom end of the abutment block 503 is coaxially fixed with an upper positioning block 509, the upper positioning block 509 is provided with a through hole, the through hole is communicated with one end of the air outlet cavity 508, and the upper positioning block 509 extends into the inner cavity of the cylindrical filter element 510 and is communicated with the inner cavity of the cylindrical filter element 510;

[0041] A lower positioning block 512 is fixedly connected to the inner bottom wall of the housing 511 , and the lower positioning block 512 extends into the inner cavity of the cylindrical filter element 510 .

[0042] By setting the lower positioning block 512 and the upper positioning block 509, the cylindrical filter element 510 is fixed, and the sealing degree between the shell 511, the cover body 501 and the cylindrical filter element 510 is increased.

[0043] According to a further optimization scheme, a limit ring 505 is circumferentially fixedly connected to the outer wall of the shell 511 . The limit ring 505 is located at the upper part of the shell 511 , and the top surface of the limit ring 505 abuts against the cover body 501 .

[0044] The limiting ring 505 prevents the housing 511 from being over-screwed into the cover 501 .

[0045] In a further optimized solution, a sealing gasket 504 is sleeved on the outer side of the housing 511 , and the sealing gasket 504 is located between the limiting ring 505 and the cover 501 . The sealing gasket 504 increases the sealing between the cover 501 and the housing 511 .

[0046] After the exhaust gas enters the air inlet pipe 2, it passes through one of the first valves 3, and then enters the cover body 501 through the air inlet connecting pipe 502. The gas diffuses in the gap 513, enters the inner cavity of the cylindrical filter element 510 after being filtered by the cylindrical filter element 510, and is then discharged through the air outlet connecting pipe 506. When one of the filters 5 is blocked, the filter 5 is replaced by switching the first valve 3 to make the equipment work normally.

[0047] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. An automatically switching dual filter element device, characterized in that: include: An air inlet pipe (2) is connected to the air outlet of the diffusion furnace; A suction pipe (1) connected to an external negative pressure suction device; A first filter assembly, the head end of which is in communication with the air inlet pipe (2), and the tail end of which is in communication with the air extraction pipe (1), the first filter assembly comprising a first valve (3) in communication with the air inlet pipe (2), the first valve (3) being in communication with a filter (5), and the filter (5) being in communication with the air extraction pipe (1); A second filter assembly, the head end of which is in communication with the air inlet pipe (2), and the tail end of which is in communication with the air extraction pipe (1); the second filter assembly has the same structure as the first filter assembly and is arranged in parallel.

2. The automatic switching dual filter element device according to claim 1, characterized in that: The filter (5) comprises: A cover body (501), an air inlet connecting pipe (502) and an air outlet connecting pipe (506) are fixedly connected and communicated with the outer wall of the cover body (501), and the air inlet connecting pipe (502) and the air outlet connecting pipe (506) are centrally symmetrically arranged; A housing (511) is threadedly connected to the bottom of the cover (501); A cylindrical filter element (510) is arranged in the housing (511), a gap (513) is left between the cylindrical filter element (510) and the housing (511), the gap (513) is connected to the air inlet connecting pipe (502), and the inner cavity of the cylindrical filter element (510) is connected to the air outlet connecting pipe (506).

3. The automatic switching dual filter element device according to claim 2, characterized in that: An abutment block (503) is fixedly connected to the inner top wall of the cover body (501), and the abutment block (503) is coaxially arranged with the cover body (501). The bottom wall of the abutment block (503) abuts against the top end of the cylindrical filter element (510). An air outlet cavity (508) is provided in the abutment block (503), and one end of the air outlet cavity (508) is connected to the inner cavity of the cylindrical filter element (510), and the other end of the air outlet cavity (508) is connected to the air outlet connecting pipe (506) through a connecting pipe (507).

4. The automatic switching dual filter element device according to claim 3, characterized in that: An upper positioning block (509) is coaxially fixedly connected to the bottom end of the abutment block (503), and a through hole is provided on the upper positioning block (509), and the through hole is communicated with one end of the air outlet cavity (508); the upper positioning block (509) extends into the inner cavity of the cylindrical filter element (510) and is communicated with the inner cavity of the cylindrical filter element (510); A lower positioning block (512) is fixedly connected to the inner bottom wall of the housing (511), and the lower positioning block (512) extends into the inner cavity of the cylindrical filter element (510).

5. The automatic switching dual filter element device according to claim 2, characterized in that: A limiting ring (505) is circumferentially fixedly connected to the outer wall of the shell (511); the limiting ring (505) is located at the upper part of the shell (511); and the top surface of the limiting ring (505) is in contact with the cover body (501).

6. The automatic switching dual filter element device according to claim 5, characterized in that: A sealing gasket (504) is sleeved on the outer side of the shell (511), and the sealing gasket (504) is located between the limiting ring (505) and the cover body (501).

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