A probe rod structure and a portable VOCs detector

Abstract

The utility model discloses a probe rod structure and a portable VOCs detector, belonging to the technical field of VOCs detection; the probe rod structure comprises a handle, a fixed tube, an extension tube, a reversing tube and a probe, a fixed tube is arranged at one end of the handle, the extension tube is coaxially arranged with the fixed tube, the reversing tube is connected with the extension tube, the probe is detachably connected with the reversing tube, a filter is arranged on the probe, and a filter membrane is arranged between the reversing tube and the probe; the portable VOCs detector comprises a probe rod structure and a detection host, and the detection host is connected to the probe rod structure through a hose; the probe rod structure of the utility model is convenient for flexibly adjusting its length and the probe angle, so that the detector can better adapt to different detection environments.

Description

Technical Field

[0001] The utility model relates to a probe rod structure and a portable VOCs detector, belonging to the technical field of VOCs detection. Background Art

[0002] In the VOCs gas chromatography monitoring technology, detectors are particularly important. Common detectors include thermal conductivity detectors TCD, hydrogen flame ionization detectors FID, electron capture detectors ECD, flame photometric detectors FPD, thermal ionization detectors NPD, etc. Among them, hydrogen flame ionization detectors FID have high sensitivity and selectivity to hydrocarbon compounds, and are widely used because of their advantages of responding to almost all organic matter, and having no response or very small response to inorganic matter, inert gas or substances that do not dissociate in the flame. For the FID detector, it is mainly composed of an ionization chamber and an amplifier circuit. The ionization chamber is provided with channels for combustion gas, auxiliary gas, and exhaust gas to enter and exit the ionization chamber, as well as an interface connected to the probe (sampler), which constitute the body of the detector. For the convenience of use, portable FID detectors have emerged. Existing portable FID detectors all set the detector body in a portable shell, and batteries are also set in the shell. The shell is correspondingly provided with various channels and interfaces to connect the sampling probe, etc.

[0003] At present, the sampling probes in the portable VOCs detectors used at home and abroad are usually straight rods with a fixed overall length, and a filter membrane is installed inside (the gas entering the probe can be filtered through the filter membrane). Because the distance of the on-site leakage detection point is uncontrollable, the length of the sampling probe is limited; and because the sampling probe needs to be used around valves, flanges, pumps, compressors, sealed exhaust ports and inspection port seals for detection, some detection positions are not convenient for straight rods to be inserted, which limits the angle of the sampling probe; the above two situations will cause on-site engineering personnel to be unable to reach some leakage detection points and unable to perform leakage detection tasks. In addition, due to poor on-site working conditions during actual leak detection applications, there are also leaks of corrosive gases and toxic and harmful gases, causing contamination of flange connections, pipe valves, drain ports and other places at the detection location. When the instrument is working, the sampling probe is close to the leak source and a diaphragm pump is used to extract the sample gas to be measured into the FID of the instrument for sample gas leak detection. Therefore, when leak sampling occurs, residual particles at the measured location are sucked into the sampling probe and adsorbed on the filter membrane, causing blockage of the filter membrane and poor filtering effect, which will cause the instrument to stall and inaccurate leak detection. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a probe rod structure and a portable VOCs detector.

[0005] The technical solution adopted by the utility model is: designing a probe rod structure, which includes a handle, a fixed tube, an extension tube, a reversing tube and a probe, a fixed tube is arranged at one end of the handle, the extension tube and the fixed tube are coaxially arranged, the reversing tube is connected to the extension tube, the probe is detachably connected to the reversing tube, a filter net is arranged on the probe, and a filter membrane is arranged between the reversing tube and the probe.

[0006] An air intake passage is provided in the middle of the handle, which passes through the handle and is connected to the fixed tube. One end of the extension tube extends out of the fixed tube, and the other end extends into the fixed tube and can slide along the fixed tube. A locking structure is provided on the fixed tube, and the locking structure can be connected to the extension tube to limit its sliding; the reversing tube can be rotated freely within a range of at least 90° relative to the extension tube.

[0007] Furthermore, one end of the extension tube of the present design extends out of the fixed tube, and the other end extends into the air inlet passage of the fixed tube and the handle, and can slide along the air inlet passage of the fixed tube and the handle.

[0008] Furthermore, the extension tube of the present design is provided with external threads protruding from the outer surface of the extension tube at both ends and on the tube body between the two ends, and the locking structure can be threadedly connected with the external threads provided on the outer surface of the extension tube.

[0009] Furthermore, the locking structure of the present design includes an integrally formed large cylinder portion and a small cylinder portion, wherein the large cylinder portion and the small cylinder portion are respectively provided with internal threads, the large cylinder portion is threadedly connected to the fixed pipe, and the small cylinder portion is threadedly connected to the outer surface of the extension pipe at an external thread.

[0010] Furthermore, the tube body between the two ends of the extension tube described in the present design is provided with 2 to 6 external threads protruding from the outer surface of the extension tube in an array, and all of them can be threadedly connected with the locking structure.

[0011] Furthermore, the reversing tube described in the present design adopts a gooseneck tube, one end of which is threadedly connected to the extension tube, and the other end is threadedly connected to the probe.

[0012] Furthermore, the probe of the present design includes an integrally formed small end and a large end, the small end is threadedly connected to the reversing pipe, a filter is provided at the large end, and the large end is a trumpet-shaped structure.

[0013] Furthermore, a membrane ring is provided in the small end of the probe of the present design, a filter membrane is placed on the membrane ring, the reversing tube extends into the small end of the probe and presses against the filter membrane, and sealing rings are provided on both sides of the filter membrane.

[0014] The utility model also proposes a portable VOCs detector, wherein the probe rod structure described above further comprises a detection host, a probe rod connector is provided on the detection host, and the detection host is connected to the probe rod structure through a hose.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model can reliably adjust the overall length of the probe structure by setting a fixed tube, an extension tube and a locking structure, so that the operator can flexibly adjust the sampling length required according to the distance of the on-site leakage detection point, so that the sampling probe avoids length limitation; and through the setting of the reversing tube, it is convenient for the sampling probe to detect around valves, flanges, pumps, compressors, sealed exhaust ports and inspection port seals when in use, so that the sampling probe avoids angle limitation; and thus helps on-site engineering personnel to accurately reach the leakage detection point to perform leakage detection tasks. In addition, through the setting of the filter net on the probe, the residual particulate matter at the measured position can be blocked to a certain extent (or preliminarily filtered) during leakage sampling, preventing it from being sucked into the sampling probe and adsorbed on the filter membrane, avoiding rapid clogging of the filter membrane, extending the service life of the internal filter membrane, reducing the number of replacements, reducing costs, ensuring its stable filtering effect, and ensuring stable and accurate detection.

[0017] The probe is detachably connected to the reversing tube, and the filter membrane is arranged between the reversing tube and the probe, which is convenient for disassembly, assembly and replacement of the filter membrane, thereby providing convenience for the detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the axonometric view of the portable VOCs detector of the utility model.

[0020] Figure 2 It is a schematic diagram of the axonometric view of the probe rod structure of the utility model.

[0021] Figure 3 It is a schematic cross-sectional view of the probe rod structure of the utility model.

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0023] Figure 5 This is a schematic diagram of the exploded view of the assembly of the reversing tube, probe, etc.

[0024] Figure 6 It is a schematic diagram of the extension tube of the utility model.

[0025] In the figure: 1. handle; 2. fixed tube; 3. extension tube; 4. reversing tube; 5. probe; 6. filter screen; 7. filter membrane; 8. air inlet channel; 9. locking structure; 10. membrane ring; 11. sealing ring; 12. detection host; 13. hose. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] like Figure 2-5 As shown: a probe rod structure, which includes a handle 1, a fixed tube 2, an extension tube 3, a reversing tube 4 and a probe 5. The fixed tube 2 is arranged at one end of the handle 1 (the handle 1 may be provided with anti-slip stripes), the fixed tube 2 is fixedly connected to the handle 1, the extension tube 3 is coaxially arranged with the fixed tube 2, the extension tube 3 is inserted into the fixed tube 2, the reversing tube 4 is detachably connected to the extension tube 3, the probe 5 is detachably connected to the reversing tube 4, the probe 5 is used to extend into the detection point for detection, the probe 5 is provided with a metal filter 6, a filter membrane 7 is provided between the reversing tube 4 and the probe 5, the filter 6 is used to initially filter particulate impurities, reduce the burden of the filter membrane 7, extend the use and replacement cycle of the filter membrane 7, and maintain the detection efficiency of the probe rod structure. The metal filter 6 can be regularly swept and cleaned.

[0030] The middle part of the handle 1 is provided with an air inlet passage 8 which penetrates the handle 1 and is connected to the fixed tube 2. One end of the extension tube 3 extends out of the fixed tube 2, and the other end extends into the fixed tube 2 and can slide along the fixed tube 2. The length of the probe rod can be extended by adjusting the length of the extension tube 3 extending out of the fixed tube 2, so as to perform detection operations at a distant detection point. The fixed tube 2 is provided with a locking structure 9, which can be connected with the extension tube 3 to limit its sliding. The extension tube 3 is fixed on the fixed tube 2 through the locking structure 9 to fix the length of the probe rod, which is convenient for detection and use; the reversing tube 4 can be freely rotated within a range of at least 90° relative to the extension tube 3, so as to adjust the angle of the probe 5, so as to facilitate detection by extending into a circle around valves, flanges, pumps, compressors, sealed exhaust ports and inspection port seals.

[0031] Example 2

[0032] This embodiment is based on the embodiment 1, and further optimizes the probe rod structure, specifically:

[0033] The probe structure described in this embodiment has one end of the extension tube 3 extending out of the fixed tube 2, and the extension length of the extension tube 3 can be adjusted by extending the end of the extension tube 3 extending out of the fixed tube 2. The other end extends into the air inlet channel 8 of the fixed tube 2 and the handle 1, and the extension tube 3 almost covers the entire length of the air inlet channel 8 of the handle 1, and the extension tube 3 can slide along the air inlet channel 8 of the fixed tube 2 and the handle 1. The air inlet channel 8 and the fixed tube 2 are combined to accommodate the extension tube 3, so that the length of the extension tube 3 can be set as long as possible, so that the range of the telescopic adjustment of the probe is as large as possible, so that the detection range of the probe is larger, and the deficiency of the limited length of the probe structure is optimized.

[0034] Example 3

[0035] This embodiment is based on the embodiment 2, and further optimizes and refines the probe rod structure, specifically:

[0036] like Figure 6 As shown: the probe structure described in this embodiment has external threads protruding from the outer surface of the extension tube 3 on both ends of the extension tube 3 and on the tube body between the two ends of the extension tube 3, and the locking structure 9 can be threadedly connected with the external threads on the outer surface of the extension tube 3. The locking structure 9 is threadedly connected with the extension tube 3, so that the extension tube 3 can no longer slide back and forth, so that the total length of the probe structure is temporarily fixed for easy detection and use. On the other hand, the threaded connection structure can also form a good sealing effect to ensure the detection accuracy at the probe 5.

[0037] Example 4

[0038] This embodiment is based on the embodiment 3, and further optimizes and refines the locking structure 9, specifically:

[0039] like Figure 2-3 As shown: the locking structure 9 includes an integrally formed large cylinder and a small cylinder, the large cylinder and the small cylinder are respectively provided with internal threads, the large cylinder is threadedly connected with the fixed tube 2, that is, the end of the fixed tube 2 away from the handle 1 is provided with external threads, the large cylinder of the locking structure 9 is screwed on the threaded end of the fixed tube 2, and the small cylinder is threadedly connected with the external threads provided on the outer surface of the extension tube 3. The locking structure 9 is simple in structure and easy to use.

[0040] Example 5

[0041] This embodiment is based on the embodiment 4, and further optimizes and refines the structure of the extension tube 3, specifically:

[0042] like Figure 6 As shown: In this embodiment, the tube body between the two ends of the extension tube 3 is provided with 2 to 6 (such as 3, 4 or 5) external threads protruding from the outer surface of the extension tube 3 in an array, and all of them can be threadedly connected with the locking structure 9, so that a variety of probe rod structures of different lengths can be adjusted according to the on-site working conditions, so that it will not be too short or too long, and it is more flexible to use.

[0043] Example 6

[0044] This embodiment is based on the embodiment 5, and further optimizes and refines the structure of the reversing tube 4, specifically:

[0045] like Figure 2-5 As shown: the reversing tube 4 in this embodiment adopts a gooseneck tube (a metal shaped hose 13, a metal part that can be bent arbitrarily and determine the direction.), one end of which is threadedly connected to the extension tube 3, and the other end is threadedly connected to the probe 5. The direction of the probe 5 can be adjusted arbitrarily through the gooseneck tube, and the extension length of the probe 5 after the reversal (the length of the bent part of the gooseneck tube) can be adjusted within the length range of the reversing tube 4, so that it can not only detect the detection points that the straight rod probe cannot reach, but also can be extended to the detection point position more accurately, with higher detection accuracy.

[0046] Example 7

[0047] This embodiment is based on the embodiment 6, and further optimizes and refines the structure of the probe 5, specifically:

[0048] The probe 5 of this embodiment includes an integrally formed small end and a large end, wherein the small end is threadedly connected to the reversing tube 4, and a filter screen 6 is disposed on the large end, which is a trumpet-shaped structure to increase the intake detection coverage area.

[0049] Example 8

[0050] This embodiment further optimizes and refines the setting of the filter membrane 7 on the basis of the embodiment 7, specifically:

[0051] like Figure 4 As shown: the probe rod structure described in this embodiment, the small end of the probe 5 is provided with a membrane ring 10, the filter membrane 7 is placed on the membrane ring 10, the reversing tube 4 extends into the small end of the probe 5 and presses against the filter membrane 7, that is, presses against the membrane ring 10, so as to facilitate the replacement of the filter membrane 7. Sealing rings 11 are respectively provided on both sides of the filter membrane 7.

[0052] Example 9

[0053] like Figure 1 As shown: This embodiment discloses a portable VOCs detector, which includes the probe rod structure described in the above embodiment, and also includes a detection host 12, on which a probe rod connector is provided, and the detection host 12 is connected to the probe rod structure through a hose 13. Usually, the detector also includes a hand operator, which is composed of an explosion-proof smart phone and a portable VOCs analysis software. When in use, the hand operator communicates with the instrument via Bluetooth, and the APP realizes Bluetooth connection, ignition, calibration, reading, result recording and query, etc., which is a prior art.

[0054] When using the probe rod structure of the utility model, according to the actual situation of the on-site detection point, hold the locking structure 9 and rotate the extension tube 3 (pull the extension tube 3 when the extension tube 3 is disconnected from the locking structure 9), adjust the overall length of the probe rod, and then choose whether to bend the reversing tube 4 as needed, and connect the probe rod structure to the detection host 12 for use.

[0055] Although a retractable sampling probe structure has been proposed, the sealing and connection reliability of the joint after retraction are poor; and some probes have the probe 5 part set as an elbow structure, but it is usually a fixed elbow structure with poor flexibility in use.

[0056] In addition, in the description of the present utility model, unless otherwise specified, if the terms "multiple", "multiple roots", "multiple groups" are used, they mean two or more than two, and "several", "several roots", "several groups" mean one or more than one. In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", "third" are used, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A probe rod structure, characterized in that: It includes a handle, a fixed tube, an extension tube, a reversing tube and a probe, wherein a fixed tube is arranged at one end of the handle, the extension tube is coaxially arranged with the fixed tube, the reversing tube is connected with the extension tube, the probe is detachably connected with the reversing tube, a filter screen is arranged on the probe, and a filter membrane is arranged between the reversing tube and the probe; The middle part of the handle is provided with an air inlet passage which passes through the handle and is connected to the fixed tube. One end of the extension tube extends out of the fixed tube, and the other end extends into the fixed tube and can slide along the fixed tube. The fixed tube is provided with a locking structure which can be connected with the extension tube to restrict its sliding. The reversing tube can be rotated freely within a range of at least 90 degrees relative to the extension tube.

2. The probe structure according to claim 1, characterized in that: One end of the extension tube extends out of the fixed tube, and the other end extends into the fixed tube and the air inlet channel of the handle, and can slide along the fixed tube and the air inlet channel of the handle.

3. The probe structure according to claim 2, characterized in that: External threads protruding from the outer surface of the extension tube are respectively arranged on the two ends of the extension tube and on the tube body between the two ends of the extension tube, and the locking structure can be threadedly connected with the external threads arranged on the outer surface of the extension tube respectively.

4. The probe rod structure according to claim 3, characterized in that: The locking structure includes an integrally formed large cylinder and a small cylinder, wherein the large cylinder and the small cylinder are respectively provided with internal threads, the large cylinder is threadedly connected to the fixed pipe, and the small cylinder is threadedly connected to the outer surface of the extension pipe where the external threads are provided.

5. The probe structure according to claim 4, characterized in that: The tube body between the two ends of the extension tube is provided with 2 to 6 external threads protruding from the outer surface of the extension tube in an array, and all of them can be threadedly connected with the locking structure.

6. The probe rod structure according to claim 5, characterized in that: The reversing tube adopts a gooseneck tube, one end of which is threadedly connected to the extension tube, and the other end of which is threadedly connected to the probe.

7. The probe structure according to claim 6, characterized in that: The probe comprises an integrally formed small end and a large end, wherein the small end is threadedly connected to a reversing pipe, a filter screen is arranged on the large end, and the large end is a trumpet-shaped structure.

8. The probe structure according to claim 7, characterized in that: A membrane ring is arranged inside the small end of the probe, a filter membrane is placed on the membrane ring, the reversing tube extends into the small end of the probe and presses against the filter membrane, and sealing rings are arranged on both sides of the filter membrane.

9. A portable VOCs detector, characterized in that: It comprises the probe rod structure as described in claims 1 to 8, and also comprises a detection host, wherein the detection host is provided with a probe rod joint, and the detection host is connected to the probe rod structure through a hose.

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