Silica powder filter with back flushing structure

Abstract

The utility model provides a silicon powder filter with a back flushing structure, and aims to solve the technical problem that a filter for filtering silicon powder in hydrogen is easy to block. A filter element is arranged in the shell, a venturi nozzle is arranged at one end of the shell, and the large-opening end of the venturi nozzle is close to the filter element. The connecting pipe penetrates from one end, with a small opening, of the Venturi nozzle; the interior of the table body is of a hollow structure, the table body is located in the Venturi nozzle, and the small end of the table body communicates with the end of the connecting pipe; and the flow dividing pipes are all arranged at the other end of the table body, and the length direction of the flow dividing pipes is consistent with the length direction of the connecting pipes. When the filter works normally, filtered hydrogen flows out of the Venturi nozzle through the shunt pipe, the table body and the connecting pipe. When the filter needs to be cleaned, the air source is connected to the end part of the connecting pipe, and the filter element is reversely blown, so that the aim of completely blowing out silicon powder in the filter element is fulfilled, and the function of cleaning the filter element is realized.

Description

Technical Field

[0001] The utility model relates to a filter, in particular to a silicon powder filter with a back-flushing structure. Background Art

[0002] In polysilicon production systems, the recovered hydrogen from the reduction process contains a large amount of fine silicon powder. This fine silicon powder must be filtered before the hydrogen can be recovered and reused. Silicon powder filters are currently widely used to intercept this fine silicon powder. These filters have a built-in metal sintered filter element with a 1µm filter element precision and a small filter gap. Long-term use can lead to clogging and filtration failure. Utility Model Content

[0003] In view of the technical problem in the prior art that filters for filtering silicon powder in hydrogen are easily clogged, the utility model provides a silicon powder filter with a backflushing structure, which has the advantage of being able to quickly clean clogged filters.

[0004] The technical solution of the utility model is:

[0005] A silicon powder filter with a back-flushing structure, comprising:

[0006] A housing having a filter element therein and a venturi nozzle at one end thereof, wherein the end with a larger opening of the venturi nozzle is close to the filter element;

[0007] A connecting pipe is inserted into the end of the Venturi nozzle with a smaller opening;

[0008] A platform body having a hollow interior, the platform body being located in the venturi nozzle, and the small end of the platform body being connected to the end of the connecting pipe;

[0009] A plurality of shunt pipes are arranged on the other end of the platform, and the length direction of the shunt pipes is consistent with the length direction of the connecting pipe.

[0010] Optionally, the platform is a frustum structure, and an expansion structure is provided on the circumference of the platform.

[0011] Optionally, the expansion structure comprises:

[0012] The airbag is arranged on the circumference of the platform.

[0013] Optionally, the expansion structure further comprises:

[0014] A catheter is provided in the platform, one end of the catheter is connected to the airbag, and the other end is located in the connecting tube. This end of the catheter extends along the length direction of the connecting tube and faces the end with the smaller opening of the Venturi nozzle.

[0015] Optionally, one end of the catheter away from the airbag is a bell mouth.

[0016] Optionally, the airbag is annular and sleeved on the axial direction of the platform. A positioning ring is provided in the airbag, and the positioning ring is sleeved on the platform.

[0017] Optionally, the larger end of the platform body has a cylindrical connecting portion, and the airbag and the positioning ring are both arranged on the connecting portion.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] A filter element is housed within the housing, with a Venturi nozzle at one end, forming a filter. A connecting tube is then installed within the Venturi nozzle, with a platform at the end of the connecting tube and several diverter tubes mounted on the platform. When the filter is operating normally, filtered hydrogen flows through the diverter tubes, platform, and connecting tubes, exiting the Venturi nozzle. To clean the filter, an air source is connected to the end of the connecting tube to backflush the filter element, thereby removing all silicon powder from the filter element and completing the filter cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is a structural diagram of the connecting pipe, the platform body and the diverter pipe;

[0023] Figure 3 Schematic diagram of the end of the platform;

[0024] Figure 4 Schematic diagram of the expanded structure. DETAILED DESCRIPTION

[0025] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present invention are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, 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 to the present invention.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1:

[0030] See also Figure 1-Figure 3 A silicon powder filter with a backflush structure includes a housing 1, a filter element 2, a venturi nozzle 3, a connecting pipe 4, a platform 5, and a diverter pipe 6. Specifically, the housing 1 is long and narrow, the filter element 2 is disposed inside the housing 1, and the venturi nozzle 3 is disposed within one end of the housing 1. The venturi nozzle 3 has a large opening at one end and a small opening at the other end.

[0031] One end of the connecting pipe 4 passes through the end with a smaller opening of the venturi nozzle 3, and a platform 5 is provided on the end of the connecting pipe 4 passing through the venturi nozzle 3. One end of the platform 5 is larger and the other end is smaller, wherein the end with a smaller end is connected to the connecting pipe 4.

[0032] The platform 5 is a hollow structure, and the platform 5 and the connecting pipe 4 are in a communicating structure.

[0033] A plurality of diversion pipes 6 are provided on one end of the platform 5 away from the connecting pipe 4 . The diversion pipes 6 are hollow structures and communicate with the interior of the platform 5 . The length direction of the diversion pipes 6 is consistent with the length direction of the connecting pipe 4 .

[0034] When the filter is operating normally, filtered hydrogen flows out of the venturi nozzle 3 through the diverter pipe 6, the platform 5, and the connecting pipe 4. When the filter needs to be cleaned, an air source is connected to the end of the connecting pipe 4 to backflush the filter element 2, thereby blowing out all the silicon powder in the filter element 2 and completing the cleaning function of the filter element 2.

[0035] In one specific embodiment:

[0036] The platform 5 is a truncated cone structure, and an expansion structure is provided on the circumference of the platform 5. Specifically, the expansion structure includes an airbag 7, and the airbag 7 is an annular structure. The airbag 7 is arranged around the circumference of the platform 5. By providing the airbag 7, the outer periphery of the platform 5 can be in a closed contact state with the inner wall of the Venturi nozzle 3, so that when the filter element 2 is back-blown, the back-blowing air pressure can be prevented from leaking from the Venturi nozzle 3.

[0037] Preferably, the expansion structure also includes a catheter 8, which is arranged in the platform 5, and one end of the catheter 8 is connected to the airbag 7, and the other end of the catheter 8 extends into the connecting tube 4 and is located in the connecting tube 4, and the end port of the catheter 8 located in the connecting tube 4 is facing the end of the connecting tube 4 away from the platform 5.

[0038] In this embodiment, by providing a conduit 8 and connecting it to the airbag 7, when backflushing the filter element 2, air flows from the conduit 8 into the platform 5 and then into the filter element 2 through the diverter tube 6. During this process, part of the airflow flows into the conduit 8, and under the action of air pressure, the airbag 7 is blown up through the conduit 8, causing the airbag 7 to come into close contact with the inner wall of the Venturi nozzle 3. During operation of the filter element 2, due to the airflow flowing from the platform 5 to the connecting tube 4 and out of the connecting tube 4, the air pressure in the airbag 7 is greater than the air pressure in the connecting tube 4, thereby deflating the airbag 7. This prevents contact between the airbag 7 and the inner wall of the Venturi nozzle 3, which reduces the output efficiency of the filtered hydrogen.

[0039] In another specific embodiment:

[0040] One end of the conduit 8 away from the airbag 7 is a bell mouth. By providing the bell mouth, the airbag 7 can be quickly blown into an inflated state when the filter element 2 is back-blown.

[0041] The larger end of the platform 5 has a cylindrical connecting portion, on which both the airbag 7 and the positioning ring are located. Specifically, the airbag 7 is mounted on the connecting portion of the platform 5, and a positioning ring 9 is provided inside the airbag 7. The positioning ring 9 is also mounted on the connecting portion of the platform 5, and the positioning ring 9 is used to fix the airbag 7 on the platform 5.

[0042] The purpose of providing a connecting portion on the platform 5 is to provide an attachment point for the airbag 7 to prevent the airbag 7 from sliding along the inclined surface of the platform 5 under the action of pressure.

[0043] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A silicon powder filter with a backflush structure, characterized in that: include: A housing having a filter element therein and a venturi nozzle at one end thereof, wherein the end with a larger opening of the venturi nozzle is close to the filter element; A connecting pipe is inserted into the end of the Venturi nozzle with a smaller opening; A platform body having a hollow interior, the platform body being located in the venturi nozzle, and the small end of the platform body being connected to the end of the connecting pipe; A plurality of shunt pipes are arranged on the other end of the platform, and the length direction of the shunt pipes is consistent with the length direction of the connecting pipe.

2. The silicon powder filter with a back-flushing structure according to claim 1, characterized in that: The platform is a truncated cone structure, and an expansion structure is provided on the circumference of the platform.

3. The silicon powder filter with a back-flushing structure according to claim 2, characterized in that: The expansion structure comprises: The airbag is arranged on the circumference of the platform.

4. The silicon powder filter with a back-flushing structure according to claim 3, characterized in that: The expansion structure further comprises: A catheter is provided in the platform, one end of the catheter is connected to the airbag, and the other end is located in the connecting tube. This end of the catheter extends along the length direction of the connecting tube and faces the end with the smaller opening of the Venturi nozzle.

5. The silicon powder filter with a back-flushing structure according to claim 4, characterized in that: One end of the catheter away from the airbag is a bell mouth.

6. The silicon powder filter with a back-flushing structure according to claim 5, characterized in that: The airbag is annular and sleeved on the axial direction of the platform. A positioning ring is provided in the airbag, and the positioning ring is sleeved on the platform.

7. The silicon powder filter with a back-flushing structure according to claim 6, characterized in that: The larger end of the platform body is provided with a cylindrical connecting portion, and the air bag and the positioning ring are both arranged on the connecting portion.

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