Oxygen measuring and sampling system for centrifugal machine

Abstract

The utility model relates to the technical field of centrifugal machines, in particular to an oxygen measuring and sampling system for a centrifugal machine, which comprises the centrifugal machine and an analyzer. The conveying pipeline comprises a detection pipeline assembly used for conveying gas from the communicating centrifugal machine to the analyzer, a collecting device, a blowback pipeline assembly used for blowing low-pressure nitrogen into the collecting device from the front of the analyzer, and a switch assembly used for controlling the opening and closing states of the detection pipeline assembly and the blowback pipeline assembly. The opening and closing states of the detection pipeline assembly and the blowback pipeline assembly are controlled through the switch assembly, normal sampling of gas by the detection pipeline assembly and purging of the pipeline assembly by the blowback pipeline assembly are achieved, the cleanliness degree in the pipeline assembly is guaranteed, inaccurate measurement of the oxygen content is avoided, and therefore potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the field of centrifuges, in particular to an oxygen measuring sampling system for centrifuges. Background Art

[0002] Centrifuges generate large centrifugal force through rotational motion, which can separate, prepare, concentrate and purify substances. Centrifuges are widely used in chemical engineering, petroleum, food processing, pharmaceuticals, mineral processing engineering, carbon, water treatment, nuclear energy industry and shipbuilding. When centrifuges are used to centrifuge some flammable raw materials, the oxygen content of the centrifuge needs to be kept within a safe range. When the oxygen content of existing centrifuges is too high during operation, the raw materials have the risk of explosion. In order to ensure the safe operation of the centrifuge, it is necessary to ensure that the oxygen content in the centrifuge is kept within a safe range. Therefore, the centrifuge is equipped with an oxygen content analyzer to detect the oxygen content to ensure the safe operation of the centrifuge.

[0003] For example, the patent application number (2021206073552) provides an oxygen concentration alarm centrifuge, which includes a centrifuge body, a support column and a base. The centrifuge body is provided with an outlet pipe, and a filter is connected to the bottom of the outlet pipe. A fixed cover is provided at the upper end of the filter, and a diversion device is provided on the fixed cover. The end of the air duct is connected to an oxygen concentration detector, and a controller is fixedly connected above the oxygen concentration detector, and an alarm and a display are provided on the controller. The above utility model sets a filter in front of the oxygen concentration detector to filter the gas to be sampled first and remove debris, thereby improving the measurement accuracy of the oxygen concentration detector. The controller can control the alarm to effectively avoid accidents.

[0004] Although a filter device is installed between the centrifuge and the analyzer, the filter device does not completely filter out the easily condensable components in the sampled gas, and some of them still remain in the pipeline. In particular, transparent PU hoses are usually used as gas sampling pipelines. This sampling pipeline is relatively long and prone to U-bends. It is easy for liquid to accumulate at the U-bend of the sampling tube, causing the sampling gas path to be blocked. These accumulated liquids will affect the measurement accuracy of the oxygen concentration detector in the gas, pose a safety hazard, and affect normal production. Summary of the invention

[0005] Aiming at the problem that the existing centrifuge is easily affected by residual liquid in the pipeline when detecting the concentration of the sampled gas, resulting in inaccurate measurement of the detector, the utility model provides an oxygen measurement sampling system for the centrifuge.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is: an oxygen measurement sampling system for a centrifuge, including a centrifuge and an analyzer, the sampling gas enters the analyzer from the centrifuge through a pipeline assembly, and the pipeline assembly includes: a detection pipeline assembly for conveying the sampling gas from the centrifuge to the analyzer, a collecting device, a back-blowing pipeline assembly for blowing nitrogen from the front of the analyzer to the collecting device, and a switch assembly, and the switch assembly is used to control the opening and closing of the detection pipeline assembly and the back-blowing pipeline assembly. The switch assembly controls the opening and closing of the detection pipeline assembly and the back-blowing pipeline assembly, the detection pipeline assembly realizes the function of conveying gas to the analyzer for detection and analysis, and the back-blowing pipeline assembly realizes the function of blowing the condensate in the pipeline into the collecting device, which can not only purify the cleanliness of the gas in the pipeline assembly and ensure the accuracy of the detection, but also collect the condensate to avoid its pollution of the environment.

[0007] Preferably, the detection pipeline assembly includes a first pipeline for connecting the centrifuge and the switch assembly and a second pipeline for connecting the switch assembly and the analyzer.

[0008] Preferably, the blowback pipeline assembly includes a nitrogen delivery device, a third pipeline for connecting the nitrogen delivery device with the switch assembly, and a fourth pipeline for connecting the switch assembly with the collecting device.

[0009] Preferably, the switch assembly includes a first three-way solenoid valve and a second three-way solenoid valve, each of which is provided with a normally open end, a normally closed end and a common end, the normally open end of the first three-way solenoid valve is connected to the first pipeline, the normally open end of the second three-way solenoid valve is connected to the second pipeline, the common end of the first three-way solenoid valve and the second three-way solenoid valve is connected through a fifth pipeline, the normally closed end of the first three-way solenoid valve is connected to the third pipeline, and the normally closed end of the second three-way solenoid valve is connected to the fourth pipeline. The switching between the sampling detection and blowback states of the device is achieved through the two three-way solenoid valves.

[0010] Preferably, the detection pipeline assembly further comprises a filter device, which is arranged between the centrifuge and the second three-way solenoid valve. The filter device is used to filter the debris in the circuit assembly to reduce the debris in the pipeline.

[0011] Preferably, the filtering device comprises a water filter tank, which can filter out salt in the gas, increase gas cleanliness, reduce the probability of gas crystallization in the pipeline, and extend the life of the oxygen analyzer.

[0012] Preferably, the switch assembly further comprises a control circuit system, which comprises a switch knob for switching between manual and automatic states, a manual cleaning button for operating in the manual state, and a time setting system for setting the back-blowing time and frequency in the automatic state. The back-blowing mode of the device can be switched by the switch knob. In the manual mode, the back-blowing can be realized by actively pressing the manual button. In the automatic mode, the back-blowing can be realized regularly according to the time setting system.

[0013] It can be seen from the above technical solutions that the advantages of the utility model are:

[0014] 1. The opening and closing states of the detection pipeline assembly and the blowback pipeline assembly are controlled by the switch assembly. The detection pipeline assembly realizes the function of conveying the gas to the analyzer for detection and analysis, and the blowback pipeline assembly realizes the function of blowing the condensate in the pipeline into the collection device. It can not only purify the cleanliness of the gas in the pipeline assembly and ensure the accuracy of the detection, but also collect the condensate to prevent it from polluting the environment.

[0015] 2. The switch assembly is two three-way solenoid valves, which realize the opening and closing of the pipes connected to the normally open end and the normally closed end of each three-way solenoid valve, thereby realizing the opening and closing of the detection pipeline assembly and the back-blowing pipeline assembly. Under the control of the control circuit system, the pipeline can be automatically purged periodically, reducing manual participation and saving time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The structure of the specific implementation method of the utility model is shown in FIG. Figure 1 .

[0018] Figure 2 It is a schematic diagram of gas flow in the first state of the utility model.

[0019] Figure 3 This is a schematic diagram of gas flow in state 2 of the utility model.

[0020] Figure 4 It is a schematic diagram of the structure of the switch assembly in some embodiments of the utility model.

[0021] Figure 5 It is a circuit diagram of a control circuit system in a specific implementation manner of the utility model.

[0022] Description of main reference numerals

[0023] 1-centrifuge, 2-analyzer, 3-transport pipeline, 31-detection pipeline assembly, 311-first pipeline, 312-second pipeline, 32-collecting device, 331-nitrogen delivery device, 332-third pipeline, 333-fourth pipeline, 4-switch assembly, 41-first three-way solenoid valve, 42-second three-way solenoid valve, 5-fifth pipeline, 6-filtering device. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0025] like Figure 1-5 As shown, an oxygen sampling system for a centrifuge includes a centrifuge 1 and an analyzer 2. Part of the gas in the centrifuge 1 is used as a sample gas and enters the analyzer 2 from the centrifuge 1 through a delivery pipeline 3. The analyzer 2 analyzes the oxygen concentration in the sample gas. When it is detected that the oxygen concentration in the sample gas is high, an inert gas is added to the centrifuge 1 to reduce the oxygen concentration in the centrifuge 1 to avoid safety hazards caused by excessively high oxygen concentration. In this embodiment, Figure 1 As shown, the delivery pipeline 3 includes a detection pipeline assembly 31, a collecting device 32, a blowback pipeline assembly and a switch assembly 4. The switch assembly 4 is used to control the opening and closing of the detection pipeline assembly 31 and the blowback pipeline assembly. The opening and closing of the detection pipeline assembly 31 and the blowback pipeline assembly constitute two states of the device when in use, wherein the first state is that the detection pipeline assembly 31 is opened and the blowback pipeline assembly is closed, and the detection pipeline assembly 31 transports the sample gas from the centrifuge 1 to the analyzer 2; the second state is that the blowback pipeline assembly is opened and the detection pipeline assembly is closed. The circuit assembly 31 is closed, and the blowback circuit assembly blows the condensate into the collecting device 32. Specifically, the detection circuit assembly 31 includes a first pipeline 311 for connecting the centrifuge 1 with the switch assembly 4 and a second pipeline 312 for connecting the switch assembly 4 with the analyzer 2. The blowback circuit assembly includes a nitrogen delivery device 331, a third pipeline 332 for connecting the nitrogen delivery device 331 with the switch assembly 4, and a fourth pipeline 333 for connecting the switch assembly 4 with the collecting device 32. When performing oxygen concentration detection, the device is in state one, such as Figure 2As shown, the sample gas in the centrifuge 1 can flow along the first pipe 311, enter the second pipe 312 after passing through the switch assembly 4, and then enter the analyzer 2 along the second pipe 312 to analyze the sample gas, thereby detecting the oxygen concentration; when the delivery pipeline 3 needs to be self-cleaned, the device is in state two, as shown in FIG. Figure 3 As shown, the nitrogen delivery device 331 delivers low-pressure nitrogen from the third pipeline 332 through the switch assembly 4 and into the fourth pipeline 333, and then enters the collecting device 32 along the fourth pipeline 333. During the nitrogen delivery process, the condensate remaining in the pipeline assembly will be purged into the collecting tank device. When the low-pressure nitrogen with condensate enters the collecting device 32 from the switch assembly 4, because the switch assembly 4 closes the first pipeline 311 and the second pipeline 312, the low-pressure nitrogen will not enter the centrifuge 1 and the analyzer 2, affecting the subsequent analysis. It can not only purify the cleanliness of the gas in the pipeline assembly and ensure the accuracy of the detection, but also collect the condensate to prevent it from polluting the environment.

[0026] The switch assembly 4 has a variety of structures to control the opening and closing of the detection pipeline assembly 31 and the blowback pipeline assembly, such as Figure 4 As shown, the switch assembly 4 includes four solenoid valves, which are respectively arranged on the first pipeline 311, the second pipeline 312, the third pipeline 332 and the fourth pipeline 333. The four solenoid valves are connected by a four-way pipeline. When switching between state one and state two, the solenoid valves on the corresponding pipelines are closed and opened to meet the needs. However, the above structure needs to control the four solenoid valves at the same time and requires a four-way pipeline connection. When state two is switched to state one, some low-pressure nitrogen will remain in the four-way pipeline to affect the detection of the sample gas. Therefore, this embodiment is optimized on the basis of the above structure, and provides a switch assembly 4 that ensures that the detection will not be affected while switching between state one and state two is achieved, such as Figure 2As shown, in this embodiment, the switch assembly 4 includes a first three-way solenoid valve 41 and a second three-way solenoid valve 42, each of which is provided with a normally open end, a normally closed end and a common end. The normally open end of the first three-way solenoid valve 41 is connected to the first pipeline 311, and the normally open end of the second three-way solenoid valve 42 is connected to the second pipeline 312. The common end of the first three-way solenoid valve 41 and the second three-way solenoid valve 42 are connected through a fifth pipeline 5. The normally closed end of the first three-way solenoid valve 41 is connected to the third pipeline 332, and the normally closed end of the second three-way solenoid valve 42 is connected to the fourth pipeline 333. The fifth pipeline 5 is preferably a transparent PU hose with a longer length, so that the condensate can be concentrated in the fifth pipeline 5 instead of being generated in the first pipeline 311 and the second pipeline 312. During back-blowing and purging, the condensate in the pipeline can be effectively cleaned. When the device is in state one, the first three-way solenoid valve 41 and the second three-way solenoid valve 42 are in a non-energized state. At this time, the first pipeline 311 and the first three-way solenoid valve 41 are in a connected state, and the third pipeline 332 and the first three-way solenoid valve 41 are in a closed state. The gas enters the fifth pipeline 5 from the first pipeline 311, and then enters the second three-way solenoid valve 42 from the fifth pipeline 5. At this time, the second pipeline 312 and the second three-way solenoid valve 42 are in a connected state, and the fourth pipeline 333 and the second three-way solenoid valve 42 are in a closed state. Therefore, the gas will enter the analyzer 2 along the second pipeline 312. When the device is in state two, the first three-way solenoid valve 41 and the second single-way solenoid valve are in an energized state. Figure 3 As shown, at this time, the first pipeline 311 and the second pipeline 312 are in a closed state, and the third channel and the fourth channel are in a connected state with the corresponding three-way solenoid valves. The low-pressure nitrogen will enter the first three-way solenoid valve 41 from the third channel, and then enter the fifth pipeline 5. When the nitrogen passes through the fifth pipeline 5, the condensate in the fifth pipeline 5 will move along the flow direction of the gas due to the blowing of the gas, and enter the fourth pipeline 333 from the fifth pipeline 5 along the second three-way solenoid valve 42, and then enter the collecting device 32 for collection. The low-pressure nitrogen is discharged from the outlet of the collecting device 32. In some embodiments, the collecting device 32 adopts a collecting tank.

[0027] like Figure 1 As shown, the detection pipeline assembly 31 also includes a filter device 6, which is arranged between the centrifuge 1 and the second three-way solenoid valve 42. In some embodiments, the filter device 6 adopts a water filter tank. The sample gas coming out of the centrifuge 1 will first be filtered by the water filter tank and then enter the switch assembly 4 and the analyzer 2. The water filter tank can filter out the salt in the gas, increase the cleanliness of the gas, reduce the probability of gas crystallization in the pipeline, and extend the life of the oxygen analyzer 2.

[0028] like Figure 2As shown, the switch assembly 4 also includes a control circuit system for controlling the opening and closing states of the two three-way solenoid valves, a switching knob for switching between manual and automatic states, a manual button for operating in the manual state, and a time setting system for setting the backflush time and frequency in the automatic state.

[0029] The control circuit system includes a switch knob, a manual cleaning button, and a time setting system. The switch knob is used to switch the current three-way solenoid valve between automatic control state and manual control state. The manual cleaning button is used to actively press the three-way solenoid valve to clean the pipeline when the three-way solenoid valve is in manual control state. The time setting system is used to adjust the backflush time and backflush interval of the three-way solenoid valve when the three-way solenoid valve is in automatic control state. Figure 5 As shown, the first end of the switching knob switch SA is connected to the live wire, the second end of the switching knob switch SA is connected to the first end of the normally closed contact of the time relay KT2, the second end of the normally closed contact of the time relay KT2 is connected to the first end of the power-on delay KT1, the second end of the switching knob switch SA is also connected to the first end of the normally open contact of the time relay KT1, the second end of the normally open contact of the time relay KT1 is connected to the first end of the power-on delay KT2, the second end of the normally open contact of the time relay KT1 is also connected to the first end of the first three-way solenoid valve 41, the first end of the first three-way solenoid valve 41 is also connected to the second end of the manual cleaning button SA and the first end of the second three-way solenoid valve 42, the second end of the first three-way solenoid valve 41, the second end of the second three-way solenoid valve 42, the second end of the power-on delay KT1 and the second end of the power-on delay KT2 are all connected to the neutral wire, and the first end of the manual cleaning button is connected to the switching knob switch SA.

[0030] The working process of the utility model is as follows: when oxygen concentration detection is required, the first three-way solenoid valve 41 and the second three-way solenoid valve 42 are in a non-energized state, the second pipeline 312 and the third pipeline 332 are closed, the sample gas in the centrifuge 1 flows along the first pipeline 311, passes through the fifth pipeline 5, and then enters the analyzer 2 along the second pipeline 312 and analyzes the sample gas, thereby detecting the oxygen concentration; after moving to the set time in the time setting system, or manually pressing the manual button, the first three-way solenoid valve 41 and the second three-way solenoid valve 42 are in an energized state, the first pipeline 311 and the second pipeline 312 are closed at the connection points with the corresponding three-way solenoid valves, the third pipeline 332 and the fourth pipeline 333 are connected to the corresponding three-way solenoid valve connection points, the nitrogen delivery device 331 passes the low-pressure nitrogen from the third pipeline 332 through the switch assembly 4 and enters the fourth pipeline 333, and then enters the collecting device 32 along the fourth pipeline 333, and in the process of nitrogen delivery, the condensate remaining in the pipeline assembly will be purged into the collecting tank device.

[0031] It can be seen from the above embodiments that the beneficial effect of the utility model is that the switch assembly 4 controls the opening and closing states of the detection pipeline assembly 31 and the blowback pipeline assembly, the detection pipeline assembly 31 realizes the function of conveying the gas to the analyzer 2 for detection and analysis, and the blowback pipeline assembly realizes the function of blowing the condensate in the pipeline into the collection device 32, which can not only purify the cleanliness of the gas in the pipeline assembly and ensure the accuracy of the detection, but also collect the condensate to avoid polluting the environment. The switch assembly 4 is two three-way solenoid valves, which realize the opening and closing of the pipeline connected to the normally open end and the normally closed end of each three-way solenoid valve, thereby realizing the opening and closing of the detection pipeline assembly 31 and the blowback pipeline assembly, and under the control of the control circuit system, the pipeline can be automatically purged periodically, reducing manual participation and saving time costs.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oxygen measurement sampling system for a centrifuge, comprising a centrifuge (1) and an analyzer (2), wherein the centrifuge (1) and the analyzer (2) are connected via a delivery pipeline (3), characterized in that: The delivery pipeline (3) is provided with a detection pipeline assembly (31) for delivering the sampled gas from the centrifuge (1) to the analyzer (2), a collecting device (32), a blowback pipeline assembly for blowing nitrogen from the analyzer (2) to the collecting device (32), and a switch assembly (4), wherein the switch assembly (4) is used to control the opening and closing of the detection pipeline assembly (31) and the blowback pipeline assembly.

2. The oxygen measurement sampling system for a centrifuge according to claim 1, characterized in that: The detection pipeline assembly (31) comprises a first pipeline (311) for connecting the centrifuge (1) and the switch assembly (4), and a second pipeline (312) for connecting the switch assembly (4) and the analyzer (2).

3. The oxygen measurement sampling system for a centrifuge according to claim 2, characterized in that: The blowback pipeline assembly comprises a nitrogen delivery device (331), a third pipeline (332) for connecting the nitrogen delivery device (331) with the switch assembly (4), and a fourth pipeline (333) for connecting the switch assembly (4) with the collection device (32).

4. The oxygen measurement sampling system for a centrifuge according to claim 3, characterized in that: The switch assembly (4) comprises a first three-way solenoid valve (41) and a second three-way solenoid valve (42), each of the three-way solenoid valves being provided with a normally open end, a normally closed end and a common end, the normally open end of the first three-way solenoid valve (41) being connected to the first pipeline (311), the normally open end of the second three-way solenoid valve (42) being connected to the second pipeline (312), the common end of the first three-way solenoid valve (41) and the second three-way solenoid valve (42) being connected via a fifth pipeline (5), the normally closed end of the first three-way solenoid valve (41) being connected to the third pipeline (332), and the normally closed end of the second three-way solenoid valve (42) being connected to the fourth pipeline (333).

5. The oxygen measurement sampling system for a centrifuge according to claim 3, characterized in that: The detection pipeline assembly (31) further comprises a filter device (6), wherein the filter device (6) is arranged between the centrifuge (1) and the second three-way solenoid valve (42).

6. The oxygen measurement sampling system for a centrifuge according to claim 5, characterized in that: The filtering device (6) comprises a water filter tank.

7. The oxygen measurement sampling system for a centrifuge according to claim 4, characterized in that: The switch assembly (4) also includes a control circuit system, which includes a switch knob for switching between manual and automatic states, a manual cleaning button for operating in the manual state, and a time setting system for setting the back-blowing time and frequency in the automatic state.

Images