Fluid sampling device

Abstract

A fluid sampling device provides a negative pressure airflow, so that the sample fluid is introduced from a sample introduction pipeline and flows to a sample outlet pipeline via a detection pipeline. At the same time, a filter arranged in the sample introduction pipeline or the sample outlet pipeline is used to filter out the liquid and impurities such as granular substances carried by the sample fluid flowing through the sample introduction pipeline or the sample outlet pipeline, and the carried liquid can be automatically discharged. In this way, the present invention can prevent the liquid and impurities such as granular substances carried by the sample fluid in the negative pressure pipeline from contaminating the relevant pipelines or components in the fluid sampling device during the detection process.

Description

Technical Field

[0001] The invention relates to the technical field of volatile organic matter detection, and in particular to a fluid sampling device for a sample fluid. Background Art

[0002] With the progress of human industry, air pollution is gradually increasing. Therefore, major industrial countries in the world have formulated control standards for the emission of volatile organic compounds (VOCs), and the standards are becoming more and more stringent, so that industrial gas environments are usually required to be equipped with measurement systems that can measure the composition of volatile organic compounds in the gas.

[0003] The above-mentioned volatile organic substances generally refer to organic compounds with a boiling point below 250°C under standard conditions (0°C and 760mmHg). Some people even directly define volatile organic substances as all organic compounds that exist in the atmosphere in a gaseous form, including total hydrocarbons (THC for short), non-methane total hydrocarbons (NMHC for short) and other organic compounds.

[0004] The fluid sampling device is an analysis device for detecting volatile organic substances in industrial waste gas. Due to the limitation of the structural design, such as whether the materials and parts are suitable for high-temperature environment, not all areas in the volatile organic substance analysis device are suitable for setting up a heating device (such as an oven). Therefore, the internal space of the volatile organic substance analysis device can be divided into a high-temperature area and a low-temperature area according to the temperature. The temperature of the high-temperature area is usually higher than the condensation temperature of the liquid and particulate matter (the high-temperature area is close to the heating device), and the temperature of the low-temperature area is equivalent to the general room temperature, that is, lower than or equal to the condensation temperature of the liquid and particulate matter. Generally speaking, the inlet pipeline at the front end of the volatile organic substance analysis device or the outlet pipeline at the rear end is usually in the so-called low-temperature area mentioned above.

[0005] Since the industrial waste gas generated in industrial manufacturing is usually a high-temperature and high-humidity gas, and often carries a large amount of impurities such as liquids and particulate matter, when such industrial waste gas passes through the low-temperature area inside the volatile organic compound analysis device, the impurities such as liquids or particulate matter carried in the industrial waste gas will condense on the related pipes and components in the low-temperature area due to the low temperature in the low-temperature area, thereby causing abnormalities such as pollution of the related pipes and damage to the components.

[0006] In view of this, how to provide a fluid sampling device to overcome the above-mentioned defects in the prior art is the technical problem to be solved by this application. Summary of the invention

[0007] In view of the above-mentioned problems of the prior art, the main purpose of the present invention is to provide a fluid sampling device, which can filter out impurities such as liquid and particulate matter in the sample fluid to prevent the relevant pipelines and components in the volatile organic matter analysis device from being contaminated.

[0008] Another object of the present invention is to provide a fluid sampling device that introduces sample fluid by means of negative pressure. The fluid sampling device can prevent the pump body from being contaminated by the sample fluid, thereby extending the service life of the pump body.

[0009] Another object of the present invention is to provide a fluid sampling device, which can detect whether there is abnormal leakage in related pipelines and components in a volatile organic matter analysis device.

[0010] To achieve the above-mentioned purpose and other purposes, the present invention provides a fluid sampling device, which is used for sampling a sample fluid, and the fluid sampling device includes: a detection pipeline for detecting the concentration or component of the sample fluid; a sample introduction pipeline connected to the detection pipeline to introduce the sample fluid into the detection pipeline; a sample outlet pipeline connected to the detection pipeline to export the sample fluid from the detection pipeline; a filter arranged in the sample introduction pipeline or the sample outlet pipeline, which filters out the liquid in the sample fluid in the sample introduction pipeline or the sample outlet pipeline and allows the gas in the sample introduction pipeline or the sample outlet pipeline to pass; a negative pressure pump connected to the sample outlet pipeline, which provides a negative pressure airflow, so that the sample fluid flows from the sample introduction pipeline to the sample outlet pipeline via the detection pipeline, and receives the gas passed by the filter; a liquid ejector connected to the filter, which receives the liquid filtered by the filter; and a control module that controls the negative pressure pump and the liquid ejector to perform operations.

[0011] Preferably, the fluid sampling device is a volatile organic matter analysis device, and the detection pipeline is used to detect the concentration or composition of volatile organic matter in the sample fluid.

[0012] Preferably, the filter can also filter out particulate matter in the sample fluid of the sample introduction pipeline or the sample outlet pipeline.

[0013] Preferably, the fluid sampling device further comprises at least one flow measurement unit, which is disposed on at least one of the sample introduction pipeline and the sample outlet pipeline to measure the negative pressure airflow in the sample introduction pipeline or the sample outlet pipeline.

[0014] Preferably, the fluid sampling device also has at least one valve body, which is arranged on at least one of the sample inlet pipeline, the detection pipeline and the sample outlet pipeline, and the fluid sampling device also includes a pipeline checking module, which is used to make the valve body close at least one of the sample inlet pipeline, the detection pipeline and the sample outlet pipeline. When the valve body is in a closed state and the flow measurement unit measures negative pressure airflow, it is judged that there is an abnormality in the sample inlet pipeline, the detection pipeline or the sample outlet pipeline.

[0015] Preferably, the fluid sampling device also includes a flow measurement unit, the negative pressure pump has an intake end and an exhaust end, the intake end is connected to the sample body outlet pipeline to provide the negative pressure airflow to the sample body outlet pipeline, and the exhaust end is connected to the flow measurement unit to provide the flow measurement unit with a positive pressure airflow, and the flow measurement unit measures the flow of the positive pressure airflow.

[0016] Preferably, the fluid sampling device also has at least one valve body, which is arranged on at least one of the sample inlet pipeline, the detection pipeline, the negative pressure pump and the sample outlet pipeline, and the fluid sampling device also includes a pipeline checking module, which is used to make the valve body close at least one of the sample inlet pipeline, the detection pipeline, the negative pressure pump and the sample outlet pipeline. When the valve body is in a closed state and the flow measurement unit measures positive pressure airflow, it is determined that there is an abnormality in the sample inlet pipeline, the detection pipeline, the negative pressure pump or the sample outlet pipeline.

[0017] Preferably, the fluid sampling device further comprises a flow valve, which is arranged in the sample introduction pipeline or the sample outlet pipeline to control the flow of the negative pressure airflow in the sample introduction pipeline or the sample outlet pipeline.

[0018] Preferably, the fluid sampling device also includes a flow valve, the negative pressure pump has an intake end and an exhaust end, the intake end is connected to the sample body outlet pipeline to provide a negative pressure airflow to the sample body outlet pipeline, and the exhaust end is connected to the flow valve to provide a positive pressure airflow to the flow valve. The flow valve controls the flow of the positive pressure airflow, thereby controlling the flow of the negative pressure airflow in the sample body outlet pipeline.

[0019] Preferably, the fluid sampling device also includes a liquid level sensor, and the filter has a liquid storage tank, which stores the liquid filtered by the filter, and the liquid level sensor senses the liquid level in the liquid storage tank. The control module receives the sensing result of the liquid level sensor, and when the liquid level in the liquid storage tank reaches the warning value, the control module controls the liquid ejector to perform the operation.

[0020] Preferably, the filter has a liquid storage tank, which stores the liquid filtered by the filter, and the control module controls the liquid discharger to perform an operation at a predetermined time.

[0021] In summary, the fluid sampling device of the present invention sets a filter in the sample inlet pipeline or the sample outlet pipeline to filter out impurities such as liquid and particulate matter carried in the sample fluid, so as to avoid the impurities such as liquid or particulate matter carried in the sample fluid from condensing on the relevant pipelines and components when the sample fluid flows through the low-temperature area inside the volatile organic substance analysis device, thereby avoiding abnormalities such as contamination of the relevant pipelines and components and damage to the components. In addition, the fluid sampling device of the present invention introduces the sample fluid in a negative pressure manner by setting a negative pressure pump, which can avoid contamination of the negative pressure pump by the sample fluid, thereby extending its service life. In addition, the present invention also provides a maintenance function by setting a detection mechanism to detect whether there is a leakage abnormality in the relevant pipelines or components inside the volatile organic substance analysis device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A , Figure 1B , Figure 2A , Figure 2B , Figures 3 to 5 Schematic diagrams of various embodiments of the fluid sampling device of the present invention;

[0023] Fig. 6A It is a simplified schematic diagram of the configuration structure of the first embodiment of the fluid sampling device of the present invention;

[0024] Figure 6B A simplified schematic diagram of the configuration of a second embodiment of a fluid sampling device according to the present invention; and

[0025] Figure 6C It is a schematic diagram of an embodiment of the configuration structure of the fluid sampling device of the present invention. DETAILED DESCRIPTION

[0026] The following content will be combined with the accompanying drawings to illustrate the technical content of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. In particular, the proportional relationship and relative position of each component in the accompanying drawings are only for exemplary purposes and do not represent the actual situation of the implementation of the present invention.

[0027] The specific structure and function of the fluid sampling device of the present invention will be described in detail below in conjunction with the various figures of the present invention, wherein: Figure 1A , Figure 1B , Figure 2A , Figure 2B , Figures 3 to 51 is a block diagram of various embodiments of the fluid sampling device of the present invention; FIG. 6 is a schematic diagram of an embodiment of the arrangement structure of the internal pipelines and components of the fluid sampling device of the present invention.

[0028] The fluid sampling device 1 of the present invention is used to sample the sample fluid to be detected. In the embodiment of the present invention, the sample fluid is, for example, industrial exhaust gas, and the fluid sampling device 1 is a volatile organic matter analysis device, which is used to detect the concentration or composition of volatile organic matter in the industrial exhaust gas. Figure 1A and Figure 1B The fluid sampling device 1 of the present invention mainly includes a detection pipeline 11, a sample introduction pipeline 12, a sample outlet pipeline 13, a filter 14, a negative pressure pump 15, a liquid discharger 16, and a control module 17.

[0029] The detection pipeline 11 is used to detect the concentration or components in the sample fluid. In this embodiment, the detection pipeline 11 is arranged between the sample inlet pipeline 12 and the sample outlet pipeline 13 (such as Fig. 6A , for detecting the concentration or composition of volatile organic substances in the sample fluid. Typically, the detection line 11 is disposed around a heating component (such as an oven), that is, in a high temperature area of ​​the fluid sampling device 1. In one embodiment, the detection line 11 may be connected to related detection components such as a sample storage, a sample separator, a sample detector, and an injection valve for detecting the concentration or composition of volatile organic substances. In addition, the schematic diagram of the arrangement of the detection line 11 and related detection components can be referred to Figure 6C The part shown in the dotted box.

[0030] The sample introduction pipeline 12 is connected to the detection pipeline 11 and is used to introduce the sample fluid into the detection pipeline 11. Fig. 6A and Figure 6C In this embodiment, the sample introduction pipeline 12 may include a pipeline from the sample inlet to the detection pipeline 11.

[0031] The sample outlet pipeline 13 is connected to the detection pipeline 11 to outlet the sample fluid to the detection pipeline 11. Fig. 6A and Figure 6C In this embodiment, the sample outlet pipeline 13 is also located in the low temperature area of ​​the fluid sampling device 1 , and includes the pipeline from the detection pipeline 11 to the negative pressure pump 15 .

[0032] The filter 14 may be disposed in the sample introduction pipeline 12 (eg Figure 1B , Fig. 6A As shown), it can also be set in the sample body outlet pipeline 13 (as shown Figure 1A or Fig. 6A , Figure 6C), is used to filter out the liquid carried in the sample fluid of the sample introduction pipeline 12 or the sample outlet pipeline 13, and to allow the gas in the sample fluid to pass through the sample introduction pipeline 12 or the sample outlet pipeline 13. Preferably, the filter 14 can also be used to filter out particulate matter in the sample fluid of the sample introduction pipeline 12 or the sample outlet pipeline 13.

[0033] Specifically, the filter 14 can be used to filter impurities such as liquid or granular matter carried in the sample fluid, such as Fig. 6A or Figure 6C As shown, the gas in the sample fluid passes through the filter 14, and the liquid separated is stored in the lower space of the filter 14 under the action of gravity. As described in the above background technology, since the sample introduction pipeline 12 or the sample outlet pipeline 13 is usually in the low temperature area of ​​the volatile organic matter analysis device, when the sample fluid flows through the sample introduction pipeline 12 or the sample outlet pipeline 13, the impurities such as liquid or granular substances carried by the sample fluid are easily condensed on the tube wall of the sample introduction pipeline 12 or the sample outlet pipeline 13, thereby damaging the relevant components arranged on the sample introduction pipeline 12 or the sample outlet pipeline 13. Therefore, the present invention provides a filter 14 in the sample introduction pipeline 12 or the sample outlet pipeline 13 to effectively avoid the problem that the impurities such as liquid or granular substances carried by the sample fluid condense on the tube wall of the above pipelines 12, 13 when the sample fluid flows through the sample introduction pipeline 12 or the sample outlet pipeline 13, thereby causing damage to the relevant components.

[0034] The negative pressure pump 15 is connected to the sample outlet pipeline 13, and is used to provide a negative pressure airflow, so that the sample fluid flows from the sample introduction pipeline 12 to the sample outlet pipeline 13 via the detection pipeline 11, and receives the gas in the sample fluid separated by the filter 14. Specifically, the negative pressure pump 15 is arranged at the rear end of the sample outlet pipeline 13, that is, the tail end of the fluid sampling device 1, and is used to provide a negative pressure airflow to the sample introduction pipeline 12, the detection pipeline 11 and the sample outlet pipeline 13. The sample fluid is drawn into the sample introduction pipeline 12 by the negative pressure airflow provided by the negative pressure pump 15, and enters the detection pipeline 11 for the detection and analysis of volatile organic substances, and the sample fluid after detection continues to flow to the sample outlet pipeline 13 through the detection pipeline 11. In addition, the gas in the sample fluid can pass through the filter 14 arranged in the sample introduction pipeline 12 or the sample outlet pipeline 13, and then pass through the negative pressure pump 15 and be discharged to the external space of the fluid sampling device 1. Thus, since the present invention utilizes negative pressure to introduce the sample fluid, the negative pressure pump 15 can be disposed at the rear end of the sample outlet pipe 13, that is, the rear end of the filter 14, so that the negative pressure pump 15 is not easily contaminated by impurities such as liquid or granular matter in the sample fluid, thereby preventing it from being damaged.

[0035] The liquid discharger 16 is connected to the filter 14 and is used to receive the liquid filtered by the filter 14. In this embodiment, the liquid discharger 16 is a peristaltic pump and has a connecting pipe 161 (such as Figure 5 , Fig. 6A or Figure 6C ), for discharging the liquid filtered out of the sample fluid by the filter 14 to the external space of the fluid sampling device 1 (such as Fig. 6A As shown). Since the structural design of the peristaltic pump has better airtightness to prevent leakage, the present invention can avoid the backflow of the filtered liquid and ensure the normal operation of the internal components and pipelines of the fluid sampling device 1.

[0036] The control module 17 is used to control the negative pressure pump 15 and the liquid ejector 16 to perform operations. In this embodiment, the control module 17 is, for example, a control chip, which is used to control the operation of the negative pressure pump 15 to provide negative pressure airflow for the sample introduction pipeline 12, the sample outlet pipeline 13, and the detection pipeline 11, and to control the negative pressure pump 15, for example, it can be used to control the start and stop of the negative pressure pump 15. In addition, the control module 17 is also used to control the liquid ejector 16 to discharge the liquid filtered by the filter 14 in a timely manner.

[0037] Please refer to Figure 2A and Figure 2B In another embodiment, the fluid sampling device 1 further comprises at least one flow measurement unit 18, wherein the flow measurement unit 18 can be disposed on the sample introduction pipeline 12 (eg Figure 2A ), or arranged on the sample outlet pipe 13 (as shown in Figure 2B In addition, flow measurement units 18 (such as Fig. 6A or Figure 6C As shown in FIG. 1 , the negative pressure airflow in the sample introduction pipeline 12 or the sample outlet pipeline 13 is measured, and the negative pressure airflow provided by the negative pressure pump 15 is controlled by the control module 17. The flow measurement unit 18 may be, for example, a float flowmeter.

[0038] Please continue reading Figure 2A and Figure 2B In another embodiment, the present invention can also detect whether there is leakage abnormality in the internal pipeline of the fluid sampling device 1 through the design of the flow measurement unit 18. Specifically, the fluid sampling device 1 also has at least one valve body 21, and the valve body 21 can be selectively arranged on at least one of the sample inlet pipeline 12, the sample outlet pipeline 13 and the detection pipeline 11, and the valve body 21 can also be arranged on the sample inlet pipeline 12, the sample outlet pipeline 13 and the detection pipeline 11 respectively (wherein, Figure 2A and Figure 2B Only the embodiment in which the valve body 21 is arranged on the sample introduction pipeline 12 is shown). The fluid sampling device 1 also has a pipeline checking module 19, which can be used to make the valve body 21 close at least one of the sample introduction pipeline 12, the detection pipeline 11 and the sample outlet pipeline 13. When the valve body 21 is in a closed state and the flow measurement unit 18 also measures the presence of negative pressure airflow in the above pipelines, it is determined that at least one of the sample introduction pipeline 12, the detection pipeline 11 or the sample outlet pipeline 13 has a leakage abnormality.

[0039] Please refer to Fig. 6A In one embodiment of the present application, a valve body 21a is provided at the sample inlet at the front end of the sample introduction pipeline 12, and a flow measurement unit 18a is provided on the sample introduction pipeline 12, a flow measurement unit 18b is provided on the detection pipeline 11, and a flow measurement unit 18c is provided on the sample outlet pipeline 13. When executing the pipeline check, the pipeline check module 19 closes the valve body 21a. Therefore, even if the negative pressure pump 15 is still in operation, the flow measurement unit 18a, 18b or 18c should not measure the negative pressure airflow. That is to say, if the valve body 21a is closed, when the flow measurement unit 18a does not measure the negative pressure airflow, it can be determined that there is no leakage in the sample introduction pipeline 12 and it is normal; when the flow measurement unit 18b does not measure the negative pressure airflow, it can be determined that there is no leakage in the detection pipeline 11 and the sample introduction pipeline 12 and it is normal; when the flow measurement unit 18c does not measure the negative pressure airflow, it can be determined that there is no leakage in the detection pipeline 11, the sample introduction pipeline 12 and the sample outlet pipeline 13 and it is normal.

[0040] In other words, when the flow measurement unit 18a and the flow measurement unit 18b do not measure the negative pressure airflow, and the flow measurement unit 18c measures the negative pressure airflow, it can be determined that there is a leakage abnormality in the sample outlet pipeline 13; when the flow measurement units 18a and 18b both measure the negative pressure airflow, it can be determined that the flow measurement units 18a and 18b are The magnitude of the negative pressure airflow values ​​measured, when the negative pressure airflow values ​​measured by the flow measurement units 18a and 18b are approximately equal, it means that there is a leak in the sample introduction pipeline 12, and there is no abnormality in the detection pipeline 11; when the negative pressure airflow measured by the flow measurement unit 18b is greater than the negative pressure airflow measured by the flow measurement unit 18a, it means that there are leakage abnormalities in both the sample introduction pipeline 12 and the detection pipeline 11; and when the negative pressure airflow values ​​measured by the flow measurement units 18c and 18b are approximately equal, it means that there is a leak in the detection pipeline 11, and there is no abnormality in the sample outlet pipeline 13; when the negative pressure airflow measured by the flow measurement unit 18c is greater than the negative pressure airflow measured by the flow measurement unit 18b, it means that there are leakage abnormalities in both the detection pipeline 11 and the sample outlet detection pipeline 13. It should be noted that the setting of the valve body 21 and the flow measurement unit 18 is not limited to Fig. 6A The figure is limited, and other configurations may also be used. For example, in other embodiments, in addition to the valve body 21a being provided at the sample inlet at the front end of the sample introduction pipeline 12, the valve body 21 may be provided between the sample introduction pipeline 12 and the detection pipeline 11, and the valve body may be provided between the detection pipeline 11 and the sample outlet pipeline 13, and the flow measurement unit 18c may be provided only in the sample outlet pipeline 13, so as to achieve the same pipeline inspection effect.

[0041] Please continue reading Figure 3 In another embodiment of the present invention, the negative pressure pump 15 further has an air intake end 151 and an air exhaust end 152, wherein the air intake end 151 is connected to the sample outlet pipeline 13 to provide a negative pressure airflow to the sample outlet pipeline 13, and the air exhaust end 152 is connected to the flow measurement unit 18 to provide a positive pressure airflow to the flow measurement unit 18, and the flow measurement unit 18 is used to measure the flow of the positive pressure airflow provided by the negative pressure pump 15. Preferably, the fluid sampling device 1 also has at least one valve body 21, which can be selectively arranged on at least one of the sample introduction pipeline 12, the detection pipeline 11, the negative pressure pump 15 and the sample outlet pipeline 13 according to needs (wherein, Figure 3Only an implementation mode in which the valve body 21 is arranged on the sample introduction pipeline 12 is shown, and the fluid sampling device 1 also includes a pipeline checking module 19, the pipeline checking module 19 is used to make the valve body 21 close at least one of the sample introduction pipeline 12, the detection pipeline 11, the negative pressure pump 15 and the sample outlet pipeline 13. When the valve body 21 is in a closed state and the flow measurement unit 18 measures a positive pressure airflow, it is determined that there is a leakage abnormality in the sample introduction pipeline 12, the detection pipeline 11, the negative pressure pump 15 or the sample outlet pipeline 13.

[0042] Please refer to Figure 6B In this embodiment, the suction end 151 refers to one end of the negative pressure pump 15 used to connect to the sample outlet pipeline 13, and the exhaust end 152 refers to one end of the negative pressure pump 15 used to connect to the second exhaust port. The negative pressure pump 15 provides a negative pressure airflow for the sample outlet pipeline 13 at its front end, and provides a positive pressure airflow for the pipeline at its rear end (i.e., the pipeline between the second exhaust port and the negative pressure pump 15). The flow measurement unit 18d is arranged on the pipeline between the second exhaust port and the negative pressure pump 15, and is used to measure the flow of the positive pressure airflow provided by the negative pressure pump 15 for this section of the pipeline. In addition, a valve body 21a is arranged at the sample inlet at the front end of the sample introduction pipeline 12; a valve body 21b is arranged at the connection between the sample introduction pipeline 12 and the detection pipeline 11; a valve body 21c is arranged at the connection between the detection pipeline 11 and the sample outlet pipeline 13; a valve body 21d is arranged between the sample outlet pipeline 13 and the negative pressure pump 15;

[0043] During the specific operation, first, the pipeline checking module 19 closes the valve body 21d, and the passage between the sample body outlet pipeline 13 and the negative pressure pump 15 is cut off. In this state, the flow measurement unit 18d can determine whether there is a leakage abnormality in the negative pressure pump 15 by measuring whether there is a positive pressure airflow. Next, the pipeline checking module 19 closes the valve body 21c (the valve body 21d is in the open state), and the passage between the sample body outlet pipeline 13 and the detection pipeline 11 is cut off. If in this state, the flow measurement unit 18d measures a positive pressure airflow, and it has been pre-determined that the negative pressure pump 15 does not have a leakage abnormality, it can be determined that there is a leakage abnormality in the sample body outlet pipeline 13. And so on, the pipeline checking module 19 closes the valve body 21b and the valve body 21a respectively, so as to gradually determine whether there is a leakage abnormality in the detection pipeline 11 and the sample body introduction pipeline 12, which will not be elaborated here. It should be noted that the setting of the valve body 21 and the flow measurement unit 18 is not only Figure 6B The settings shown are limited, other settings are also possible.

[0044] In other embodiments of the present application, the fluid sampling device 1 further includes a flow valve 20, wherein the flow valve 20 is disposed on the sample introduction pipeline 12 or the sample outlet pipeline 13 to control the flow of the negative pressure airflow in the sample introduction pipeline 12 or the sample outlet pipeline 13. Specifically, in practical applications, the flow valve 20 is used to adjust the flow of the negative pressure airflow through the sample introduction pipeline 12 or the sample outlet pipeline 13. The flow valve 20 can be selected to be disposed in the sample introduction pipeline 12 or on the sample outlet pipeline 13 according to actual needs, or the flow valve 20 can be used to replace the flow measurement unit 18.

[0045] Please continue reading Figure 4 In another embodiment of the present invention, the negative pressure pump 15 has an intake end 151 and an exhaust end 152, wherein the intake end 151 is connected to the sample body outlet pipeline 13 to provide a negative pressure airflow to the sample body outlet pipeline 13, and the exhaust end 152 is connected to the flow valve 20 to provide a positive pressure airflow to the flow valve 20. The flow valve 20 controls the flow of the negative pressure airflow in the sample body outlet pipeline 13 by controlling the flow of the positive pressure airflow.

[0046] Specifically, see Figure 6C , the suction end 151 refers to one end of the negative pressure pump 15 used to connect to the sample body outlet pipeline 13, and the exhaust end 152 refers to one end of the negative pressure pump 15 used to connect to the second exhaust port. Among them, the negative pressure pump 15 provides a negative pressure airflow for the sample body outlet pipeline 13 located at the front end thereof, and provides a positive pressure airflow for the pipeline located at the rear end thereof (i.e., the pipeline between the second exhaust port and the negative pressure pump 15). The flow valve 20 can be arranged on the pipeline between the second exhaust port and the negative pressure pump 15 (not shown). In general, the negative pressure airflow provided by the negative pressure pump 15 for the sample body outlet pipeline 13 should be equivalent to the positive pressure airflow provided by the negative pressure pump 15 for the pipeline between the second exhaust port and the negative pressure pump 15. Therefore, the flow rate of the positive pressure airflow in the pipeline between the second exhaust port and the negative pressure pump 15 can be controlled by the flow valve 20 to indirectly control the flow rate of the negative pressure airflow provided by the negative pressure pump 15 for the sample body outlet pipeline 13.

[0047] See also Figure 5 In this embodiment, the fluid sampling device 1 also includes a liquid volume sensor 22, and the filter 14 has a liquid storage tank 141, which is used to store the liquid filtered out from the sample fluid by the filter 14, and the liquid volume sensor 22 is used to sense the liquid volume in the liquid storage tank 141, and the control module 17 is also used to receive the liquid volume sensing result of the liquid volume sensor 22. When the liquid volume in the liquid storage tank 141 sensed by the liquid volume sensor 22 reaches the warning value, the control module 17 controls the liquid discharger 16 to perform an operation to discharge the liquid stored in the liquid storage tank 141.

[0048] In other embodiments, the liquid volume sensor 22 may not be required, and the control module 17 may control the liquid discharger 16 to perform operations according to a predetermined time to discharge the liquid stored in the liquid storage tank 141 .

[0049] In summary, the fluid sampling device of the present invention can set a negative pressure pump at the rear end of the fluid sampling device, use the negative pressure pump to introduce the sample fluid by negative pressure, and make the sample fluid pass through a filter set in the sample introduction pipeline or the sample outlet pipeline to filter out impurities such as liquid and particulate matter carried in the sample fluid, thereby preventing the impurities such as liquid and particulate matter carried in the sample fluid from condensing on the pipeline and components such as the negative pressure pump through which it flows, causing damage to related components, thereby protecting the related pipelines and components in the low temperature area from being contaminated by impurities such as liquid or particulate matter.

[0050] In addition, the present invention is also provided with a flow measurement unit, which measures whether there is airflow in the relevant pipeline by closing the sample inlet, and determines whether there is leakage abnormality in the sample introduction pipeline, the detection pipeline, the negative pressure pump or the sample outlet pipeline, so as to ensure the normal operation of the relevant pipelines and components in the fluid sampling device.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone skilled in the art may modify and alter the above embodiments without violating the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be as described in the claims of the present invention.

[0052] Explanation of symbols

[0053] 1 Fluid sampling device

[0054] 11. Detection pipeline

[0055] 12 Sample introduction pipeline

[0056] 13 Sample outlet pipeline

[0057] 14 Filters

[0058] 141 Liquid reservoir

[0059] 15 Negative pressure pump

[0060] 151 Suction end

[0061] 152 Exhaust end

[0062] 16 Liquid ejector

[0063] 161 connecting pipe

[0064] 17 Control Module

[0065] 18,18a,18b,18c,18d Flow measurement unit

[0066] 19 Pipeline Check Module

[0067] 20 Flow valve

[0068] 21,21a,21b,21c,21d Valve body

[0069] 22 Liquid level sensor.

Claims

1. A fluid sampling device for sampling a sample fluid, the fluid sampling device comprising: A detection pipeline (11), the detection pipeline is used to detect the concentration or composition of the sample fluid; A sample introduction pipeline (12), the sample introduction pipeline is connected to the detection pipeline to introduce the sample fluid into the detection pipeline; A sample outlet pipeline (13), the sample outlet pipeline is connected to the detection pipeline to guide the sample fluid out of the detection pipeline; A filter, the filter being arranged in the sample inlet pipeline or the sample outlet pipeline, filtering out liquid in the sample fluid in the sample inlet pipeline or the sample outlet pipeline, and allowing gas in the sample fluid to pass through the sample inlet pipeline or the sample outlet pipeline; A negative pressure pump (15), the negative pressure pump being connected to the sample outlet pipeline; a liquid discharger, the liquid discharger being in communication with the filter and receiving the liquid filtered out by the filter; At least one flow measurement unit, the flow measurement unit is arranged on at least one of the sample introduction pipeline and the sample outlet pipeline to measure the negative pressure airflow or the positive pressure airflow in the sample introduction pipeline or the sample outlet pipeline; at least one valve body, the valve body being arranged on at least one of the sample introduction pipeline (12), the detection pipeline (11), the negative pressure pump and the sample outlet pipeline (13); A pipeline checking module, the pipeline checking module is used to make the valve body close at least one of the sample introduction pipeline (12), the detection pipeline (11), the negative pressure pump and the sample outlet pipeline (13), and when the valve body is in a closed state and the flow measurement unit measures negative pressure airflow or positive pressure airflow, it is determined that there is an abnormality in the sample introduction pipeline, the detection pipeline, the negative pressure pump or the sample outlet pipeline.

2. The fluid sampling device according to claim 1, characterized in that: The fluid sampling device is a volatile organic matter analysis device, and the detection pipeline detects the concentration or composition of the volatile organic matter in the sample fluid.

3. The fluid sampling device according to claim 1, characterized in that: The filter can also filter out particulate matter in the sample fluid of the sample introduction pipeline or the sample outlet pipeline.

4. The fluid sampling device according to claim 1, characterized in that: The negative pressure pump is configured to provide a negative pressure gas flow to make the sample fluid flow from the sample introduction pipeline to the sample outlet pipeline via the detection pipeline, and receive the gas passed through the filter.

5. The fluid sampling device according to claim 1, characterized in that: The fluid sampling device further includes a control module, which controls the negative pressure pump and the liquid ejector to perform operations.

6. The fluid sampling device according to claim 1, characterized in that: The negative pressure pump has an intake end and an exhaust end, the intake end is connected to the sample outlet pipeline to provide the negative pressure airflow to the sample outlet pipeline, and the exhaust end is connected to the flow measurement unit to provide the positive pressure airflow to the flow measurement unit, and the flow measurement unit measures the flow of the positive pressure airflow.

7. The fluid sampling device according to claim 1, characterized in that: The fluid sampling device further comprises a flow valve, which is arranged on the sample introduction pipeline or the sample outlet pipeline to control the flow of the negative pressure airflow in the sample introduction pipeline or the sample outlet pipeline.

8. The fluid sampling device according to claim 1, characterized in that: The fluid sampling device also includes a flow valve. The negative pressure pump has an intake end and an exhaust end. The intake end is connected to the sample outlet pipeline to provide a negative pressure airflow to the sample outlet pipeline. The exhaust end is connected to the flow valve to provide a positive pressure airflow to the flow valve. The flow valve controls the flow of the positive pressure airflow, thereby controlling the flow of the negative pressure airflow in the sample outlet pipeline.

9. The fluid sampling device according to claim 4, characterized in that: The fluid sampling device also includes a control module and a liquid level sensor, and the filter has a liquid storage tank, the liquid storage tank stores the liquid filtered by the filter, and the liquid level sensor senses the liquid level in the liquid storage tank. The control module receives the sensing result of the liquid level sensor, and when the liquid level in the liquid storage tank reaches a warning value, the control module controls the liquid ejector to perform an operation.

10. The fluid sampling device according to claim 4, characterized in that: The filter has a liquid storage tank, which stores the liquid filtered by the filter. The fluid sampling device also includes a control module, which controls the liquid ejector to perform operations at a predetermined time.

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