Device for preventing materials from being reversely mixed

Abstract

The utility model provides a device for preventing materials from flowing backwards, and relates to the technical field of chemical product production. The material anti-reverse-mixing device comprises a feeding pipeline, a first material conveying pipeline, a second material conveying pipeline, a controller, a valve body assembly and a gas detector, the feeding end of the feeding pipeline is used for introducing inert gas, the discharging end of the feeding pipeline is communicated with the feeding end of the first material conveying pipeline, the discharging end of the first material conveying pipeline is communicated with the feeding end of the second material conveying pipeline, and the discharging end of the second material conveying pipeline is communicated with the controller. The discharging end of the second conveying pipeline is used for communicating with a replacement pipeline; the valve body assembly comprises at least two stop valves, one stop valve is arranged between the feeding pipeline and the first material conveying pipeline, the other stop valve is arranged between the first material conveying pipeline and the second material conveying pipeline, and the stop valves are in signal connection with the controller; the gas detector is arranged on the first material conveying pipeline and is in signal connection with the controller, and the device has the good performance of preventing gas from flowing backwards in the replacement pipeline.

Description

Technical Field

[0001] This application relates to the technical field of chemical product production, and particularly to an anti-material backflow device. Background Art

[0002] In the chemical industry, the production of polysilicon occupies an important position. Among them, it is necessary to strictly control the combustibles and combustion supports during the production process. Specifically, the staff needs to replace the oxygen combustion support in the rectification column.

[0003] In the related art, the replacement process in polysilicon production is to use a hard nitrogen pipe connected to the rectification column body for replacement. A double ball valve is provided on the hard nitrogen pipe, and a check valve and a drain valve are provided on the pipeline between the double ball valves.

[0004] However, in the related art, the ball valve is prone to internal leakage, and materials such as chlorosilane are prone to backflow into the public system pipeline network, affecting the production quality of polysilicon. Utility Model Content

[0005] The embodiments of this application provide an anti-material backflow device for preventing the backflow of gas in the replacement pipeline during polysilicon production, and ensuring the production quality and production efficiency of polysilicon.

[0006] The embodiments of this application provide an anti-material backflow device, which includes a feed pipeline, a first material conveying pipeline, a second material conveying pipeline, a controller, a valve body assembly, and a gas detector. The feed end of the feed pipeline is used to introduce an inert gas, the discharge end of the feed pipeline is connected to the feed end of the first material conveying pipeline, the discharge end of the first material conveying pipeline is connected to the feed end of the second material conveying pipeline, and the discharge end of the second material conveying pipeline is used to connect to the replacement pipeline;

[0007] The valve body assembly includes at least two cut-off valves. One of the cut-off valves is arranged between the feed pipeline and the first material conveying pipeline, and the other cut-off valve is arranged between the first material conveying pipeline and the second material conveying pipeline. The cut-off valve is signal-connected to the controller;

[0008] The gas detector is arranged on the first material conveying pipeline and is signal-connected to the controller;

[0009] The controller is used to receive the detection signal of the gas detector and control the closing of the cut-off valve to prevent the backflow gas from reaching the feed pipeline. Among them, the detection signal is sent when the gas detector detects the backflow gas from the second material conveying pipeline.

[0010] In some possible embodiments, the first material conveying pipeline includes a first material conveying pipe and a shunt pipe. Two ends of the first material conveying pipe are respectively connected to the feed pipeline and the second material conveying pipeline through the cut-off valve;

[0011] One end of the shunt pipe is connected to the side wall of the first material conveying pipe and is communicated with the first material conveying pipe. The other end of the shunt pipe is communicated with the gas detector.

[0012] In some possible embodiments, the first material conveying pipeline further includes a first flange connector. Two first flange connectors are respectively arranged at the feed end and the discharge end of the first material conveying pipe for flange connection with the feed pipeline and the second material conveying pipeline.

[0013] In some possible embodiments, the valve body assembly further includes a drain valve. The drain valve is arranged between the gas detector and the shunt pipe.

[0014] In some possible embodiments, the drain valve is threadedly connected to the gas detector.

[0015] In some possible embodiments, the first material conveying pipeline further includes a second flange connector. The second flange connector is arranged at one end of the shunt pipe away from the first material conveying pipe for flange connection with the drain valve.

[0016] In some possible embodiments, the valve body assembly further includes a ball valve. The ball valve has an air inlet end and an air outlet end. The air inlet end of the ball valve is used for introducing the inert gas. The air outlet end of the ball valve is communicated with the feed end of the feed pipeline.

[0017] In some possible embodiments, the feed pipeline includes a feed pipe body and a third flange connector. Two ends of the feed pipe body are respectively a feed end and a discharge end. Two third flange connectors are respectively arranged at the feed end and the discharge end for flange connection with the ball valve and the first material conveying pipeline respectively.

[0018] In some possible embodiments, the valve body assembly further includes a check valve. The check valve has an air inlet end and an air outlet end. The air inlet end is communicated with the discharge end of the second material conveying pipeline. The air outlet end is used for communicating with the replacement pipeline.

[0019] In some possible embodiments, the second material conveying pipeline includes a second material conveying pipe and a fourth flange connector. Two fourth flange connectors are respectively arranged at two ends of the second material conveying pipe for flange connection with the cut-off valve and the check valve respectively.

[0020] The anti-backflow device provided by this application has at least the following beneficial effects:

[0021] The anti-backflow device provided by this application includes a feed pipeline, a first material conveying pipeline, a second material conveying pipeline, a controller, a valve body assembly, and a gas detector. Among them, two cut-off valves are respectively arranged between the feed pipeline and the first material conveying pipeline, and between the first material conveying pipeline and the second material conveying pipeline. In practical applications, the controller controls the cut-off valves to be normally open to convey inert gas to the replacement pipeline for replacement treatment. When the backflow material flows back into the first material conveying pipeline, the gas detector will detect the backflow material. While the gas detector issues an alarm, it will transmit the detection signal to the controller. The controller automatically controls the two cut-off valves to close, preventing the material from backflowing, which can effectively avoid the air leakage problem caused by insufficient airtightness at the feed end of the feed pipeline and the discharge end of the second material conveying pipeline. Moreover, the cut-off valve itself has a better anti-leakage effect than ordinary ball valves, thus avoiding the entry of low-purity materials in the public system pipeline into high-purity materials during the service of the device, causing pollution; through the controller signal-connected to the gas detector and the cut-off valve, remote control can be realized. When abnormal working conditions occur, the cut-off valve can be remotely controlled to close, avoiding the possible dangers of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0023] Figure 1 It is a schematic structural diagram of the anti-backflow device for the embodiment of this application;

[0024] Figure 2 It is an exploded structural diagram of the anti-backflow device for the embodiment of this application;

[0025] Figure 3 It is an exploded structural diagram showing the cooperation between the gas detector and the drain valve.

[0026] Description of the reference numerals in the drawings:

[0027] 100 - Feed pipeline;

[0028] 110 - Feed pipe;

[0029] 120 - Third flange connector;

[0030] 200 - First material conveying pipeline;

[0031] 210 - First material conveying pipe;

[0032] 220 - Shunt pipe;

[0033] 230 - First flange connector;

[0034] 240 - Second flange connector;

[0035] 300 - Second material conveying pipeline;

[0036] 310 - Second material conveying pipe;

[0037] 320 - Fourth flange connector;

[0038] 400 - Valve body assembly;

[0039] 410 - Shut-off valve;

[0040] 411 - Fifth flange connector;

[0041] 420 - Drain valve;

[0042] 421 - Sixth flange connector;

[0043] 422 - External thread;

[0044] 430 - Ball valve;

[0045] 431 - Seventh flange connector;

[0046] 440 - Check valve;

[0047] 441 - Eighth flange connector;

[0048] 500 - Gas detector;

[0049] 510 - Internal thread.

[0050] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0051] As described in the background art, in the chemical industry field, the production of polysilicon occupies an important position. Among them, it is necessary to strictly control the combustibles and combustion-supporting substances in the production process. Specifically, the staff needs to perform replacement treatment on the oxygen combustion-supporting substances in the rectification tower.

[0052] In the related art, the replacement process in polysilicon production is to use a nitrogen hard pipe connected to the rectification tower body for replacement. A double ball valve is provided on the nitrogen hard pipe, a check valve and a drain valve are provided on the pipeline between the double ball valves, and the pipelines at both ends of the double ball valve are respectively connected to the public system pipeline and the replacement pipeline. However, in the related art, the ball valve is prone to internal leakage, and it is easy for the material to flow back into the public system pipe network, affecting the production quality of polysilicon.

[0053] The inventors have also discovered that when producing high-purity materials, due to the low cleanliness of the public system, if the ball valve has internal leakage, it is easy for public materials to enter the high-purity system and contaminate the high-purity materials; not only that, in daily replacement work, if abnormal operating conditions occur, manual operation is required to close the relevant valves, which poses a certain risk.

[0054] In order to solve the above technical problems, an embodiment of the present application provides a device for preventing material backflow, which controls the shut-off valve to be normally open through a controller to convey inert gas to the replacement pipeline for replacement treatment. When the backflow material flows back into the first feed pipeline, the gas detector will detect the backflow material. The gas detector will transmit the detection signal to the controller while issuing an alarm. The controller automatically controls the two shut-off valves to close to prevent material backflow, which can effectively avoid leakage problems caused by insufficient air tightness at the feed end of the feed pipeline and the discharge end of the second feed pipeline. Not only that, the shut-off valve itself has a better anti-leakage effect than a general ball valve, thereby preventing low-cleanliness materials in the public system pipeline from entering high-cleanliness materials when the device is in service, causing pollution. Remote control can be achieved by connecting the signal to the gas detector and the controller of the shut-off valve. When an abnormal operating condition occurs, the shut-off valve can be remotely controlled to close to avoid the dangers that may occur due to manual operation.

[0055] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0056] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0057] Reference Figures 1 to 3An embodiment of the present application provides a device for preventing material backflow, which includes a feed pipeline 100, a first feed pipeline 200, a second feed pipeline 300, a controller, a valve body assembly 400 and a gas detector 500. The feed end of the feed pipeline 100 is used to introduce an inert gas, for example, the inert gas is nitrogen, the discharge end of the feed pipeline 100 is connected to the feed end of the first feed pipeline 200, the discharge end of the first feed pipeline 200 is connected to the feed end of the second feed pipeline 300, and the discharge end of the second feed pipeline 300 is used to connect to a displacement pipeline, and the displacement pipeline is connected to the interior of a distillation tower.

[0058] The valve body assembly 400 includes at least two cut-off valves 410, one of which is arranged between the feed pipeline 100 and the first feed pipeline 200, and the other is arranged between the first feed pipeline 200 and the second feed pipeline 300. The cut-off valve 410 signal is connected to the controller; the gas detector 500 is arranged in the first feed pipeline 200, and the signal is connected to the controller.

[0059] The controller is used to receive the detection signal of the gas detector 500 and control the closing of the shut-off valve 410 to prevent the back-flow gas from being transmitted to the feed pipeline 100, wherein the detection signal is sent when the gas detector 500 detects the back-flow gas from the second feed pipeline 300, and illustratively, the back-flow gas contains chlorosilane.

[0060] In this case, the controller controls the shut-off valve 410 to be normally open to convey inert gas to the replacement pipeline for replacement treatment. When the reverse-flow material flows back into the first feed pipeline 200, the gas detector 500 will detect the reverse-flow material. The gas detector 500 will send out an alarm and transmit the detection signal to the controller. The controller automatically controls the two shut-off valves 410 to be closed to prevent the material from being reversed. This can effectively avoid leakage problems caused by insufficient air tightness at the feed end of the feed pipeline 100 and the discharge end of the second feed pipeline 300. Not only that, the shut-off valve 410 itself has a better anti-leakage effect than the general ball valve 430, thereby avoiding the low-cleanliness material in the public system pipeline from entering the high-cleanliness material when the device is in service, causing pollution. The controller connected to the gas detector 500 and the shut-off valve 410 by signal can achieve remote control. When an abnormal operating condition occurs, the shut-off valve 410 can be remotely controlled to be closed to avoid the dangers that may occur due to manual operation.

[0061] In some examples, the first feed pipeline 200 includes a first feed pipe 210 and a diversion pipe 220, and both ends of the first feed pipe 210 are respectively connected to the feed pipeline 100 and the second feed pipeline 300 through a cut-off valve 410; one end of the diversion pipe 220 is connected to the side wall of the first feed pipe 210 and communicates with the first feed pipe 210, and the other end of the diversion pipe 220 is connected to the gas detector 500.

[0062] In other possible embodiments, the first material conveying pipeline 200 further includes first flange connectors 230. The two first flange connectors 230 are respectively arranged at the feeding end and the discharging end of the first material conveying pipe 210 for flange connection with the feeding pipeline 100 and the second material conveying pipeline 300. Exemplarily, the first flange connector 230 is a flange plate.

[0063] Furthermore, a fifth flange connector 411 is provided at the end of the cut-off valve 410 for flange connection with the first flange connector 230.

[0064] As a possible embodiment, the valve body assembly 400 further includes a drain valve 420. The drain valve 420 is arranged between the gas detector 500 and the shunt pipe 220. Further, a sixth flange connector 421 is provided at the end of the drain valve 420 away from the gas detector 500. For example, the sixth flange connector 421 is a flange plate for flange connection with one end of the shunt pipe 220.

[0065] In some other embodiments, the drain valve 420 is threadedly connected to the gas detector 500. Exemplarily, the drain valve 420 includes a valve body and a housing sleeved on the outer periphery of the valve body. An external thread 422 is provided on the outer periphery of one end of the housing facing the gas detector 500, and the gas detector 500 has a housing with an internal thread 510 corresponding to the external thread 422 to enable threaded connection between the drain valve 420 and the gas detector 500.

[0066] As an example, the first material conveying pipeline 200 further includes a second flange connector 240. The second flange connector 240 is arranged at the end of the shunt pipe 220 away from the first material conveying pipe 210 for flange connection with the drain valve 420. For example, the second flange connector 240 is a flange plate for flange connection with the sixth flange connector 421 of the drain valve 420, which is convenient for disassembly or connection and installation.

[0067] In some other examples, the valve body assembly 400 further includes a ball valve 430. The ball valve 430 has an air inlet end and an air outlet end. The air inlet end of the ball valve 430 is used to introduce an inert gas, and the air outlet end of the ball valve 430 is communicated with the feeding end of the feeding pipeline 100, which can better control the connection state between the common system pipeline for introducing the inert gas and the feeding pipeline 100.

[0068] In a possible implementation, the feed pipeline 100 includes a feed pipe body 110 and third flange connectors 120. The two ends of the feed pipe body 110 are respectively a feed end and a discharge end. The two third flange connectors 120 are respectively arranged at the feed end and the discharge end to be flange-connected to the ball valve 430 and the first material conveying pipeline 200 respectively. Further, a seventh flange connector 431 is provided at one end of the ball valve 430 facing the feed pipeline 100. Exemplarily, both the third flange connector 120 and the seventh flange connector 431 are flange plates. One end of the feed pipe body 110 is flange-connected to the ball valve 430 through the cooperation of the third flange connector 120 and the seventh flange connector 431, and the other end of the feed pipe body 110 is flange-connected to the first material conveying pipe 210 through the cooperation of the third flange connector 120 and the first flange connector 230. The connection is stable and convenient for disassembly and assembly.

[0069] In some possible embodiments, the valve body assembly 400 further includes a check valve 440. The check valve 440 has an air inlet end and an air outlet end. The air inlet end is communicated with the discharge end of the second material conveying pipeline 300, and the air outlet end is used for communicating with the replacement pipeline. In this way, gas is allowed to flow unidirectionally from the air inlet end side to the discharge end to prevent gas backflow. Further, eighth flange connectors 441 are provided at both the air inlet end and the air outlet end of the check valve to be flange-connected to the fourth flange connector 320 and the replacement pipeline respectively.

[0070] In some other embodiments, the second material conveying pipeline 300 includes a second material conveying pipe 310 and fourth flange connectors 320. The two fourth flange connectors 320 are respectively arranged at both ends of the second material conveying pipe 310 to be flange-connected to the cut-off valve 410 and the check valve 440 respectively. For example, the fourth flange connector 320 is a flange plate.

[0071] In the application of the anti-material backflow device provided in the embodiments of the present application, the gas detector 500 can be a gas detection alarm. Both the cut-off valve 410 and the gas detection alarm are electrically connected to the controller. When material backflow occurs, the gas detection alarm detects the material backflow and alarms at the same time, and the cut-off valve 410 is controlled to close through the controller, which can effectively prevent the material from backflowing into the common system pipeline filled with inert gas. Moreover, the staff can also manually control the opening and closing of the two cut-off valves 410 through the controller, which is convenient for the staff to operate under abnormal working conditions.

[0072] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model.

[0073] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0074] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0075] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0076] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0077] It should be noted that the embodiments referred to in the specification, such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc., may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Further, when combining specific features, structures or characteristics with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-backflow device for materials, characterized in that It includes a feed pipeline, a first material conveying pipeline, a second material conveying pipeline, a controller, a valve body assembly and a gas detector. The feed end of the feed pipeline is used to introduce inert gas. The discharge end of the feed pipeline is connected to the feed end of the first material conveying pipeline. The discharge end of the first material conveying pipeline is connected to the feed end of the second material conveying pipeline. The discharge end of the second material conveying pipeline is used to connect to a replacement pipeline; The valve body assembly includes at least two cut-off valves. One of the cut-off valves is arranged between the feed pipeline and the first material conveying pipeline, and the other cut-off valve is arranged between the first material conveying pipeline and the second material conveying pipeline. The cut-off valves are signal-connected to the controller; The gas detector is arranged in the first material conveying pipeline and is signal-connected to the controller; The controller is used to receive the detection signal of the gas detector and control the closing of the cut-off valves to prevent reverse-flow gas from being transmitted to the feed pipeline. Among them, the detection signal is sent when the gas detector detects reverse-flow gas from the second material conveying pipeline.

2. The anti-backflow device for materials according to claim 1, characterized in that, The first material conveying pipeline includes a first material conveying pipe and a shunt pipe. The two ends of the first material conveying pipe are respectively connected to the feed pipeline and the second material conveying pipeline through the cut-off valves; One end of the shunt pipe is connected to the side wall of the first material conveying pipe and is communicated with the first material conveying pipe. The other end of the shunt pipe is communicated with the gas detector.

3. The anti-backflow device for materials according to claim 2, characterized in that, The first material conveying pipeline further includes a first flange connector. The two first flange connectors are respectively arranged at the feed end and the discharge end of the first material conveying pipe for flange connection with the feed pipeline and the second material conveying pipeline.

4. The anti-backflow device for materials according to claim 2, characterized in that, The valve body assembly further includes a drain valve. The drain valve is arranged between the gas detector and the shunt pipe.

5. The anti-backflow device for materials according to claim 4, wherein The drain valve is thread-connected to the gas detector.

6. The anti-backflow device for materials according to claim 4, characterized in that, The first material conveying pipeline further includes a second flange connector. The second flange connector is arranged at the end of the shunt pipe away from the first material conveying pipe for flange connection with the drain valve.

7. The anti-backflow device for materials according to any one of claims 1-6, characterized in that The valve body assembly further includes a ball valve. The ball valve has an air inlet end and an air outlet end. The air inlet end of the ball valve is used to introduce the inert gas. The air outlet end of the ball valve is connected to the feed end of the feed pipeline.

8. The anti-backflow device for materials according to claim 7, characterized in that, The feed pipeline includes a feed pipe and a third flange connector. The two ends of the feed pipe are respectively the feed end and the discharge end. The two third flange connectors are respectively arranged at the feed end and the discharge end for flange connection with the ball valve and the first material conveying pipeline respectively.

9. The anti-backflow device for materials according to any one of claims 1-6, characterized in that, The valve body assembly further includes a check valve. The check valve has an air inlet end and an air outlet end. The air inlet end is connected to the discharge end of the second material conveying pipeline. The air outlet end is used to connect to the replacement pipeline.

10. The anti-backflow device for materials according to claim 9, characterized in that, The second material conveying pipeline includes a second material conveying pipe and a fourth flange connector. The two fourth flange connectors are respectively arranged at both ends of the second material conveying pipe for flange connection with the cut-off valve and the check valve respectively.

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