Multi-sealed sampling probe
By employing a multi-layered sealing design and a high-efficiency filtration structure, the problem of poor sealing performance of the sampling probe is solved, achieving dustproof effect and measurement accuracy of the probe cavity, and extending the service life of the equipment.
Patent Information
- Application Number
- CN202520146826.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-22
AI Technical Summary
The existing sampling probes have poor sealing performance, which can easily clog the sampling pipeline, affecting the normal measurement of the instrument and increasing maintenance work.
It adopts a multi-seal design, including a cavity O-ring seal, an outer O-ring seal for filter element fixation, and an inner O-ring seal for filter element fixation. Combined with a ceramic filter element, it improves the dustproof function of the probe cavity. The filter element has a filtration accuracy of 0.1~0.5um and is made of 316L stainless steel and fluororubber.
It effectively prevents coal ash from entering the probe cavity, reduces instrument malfunctions, ensures stable instrument operation, improves equipment stability and service life, and ensures measurement accuracy.
Smart Images
Figure CN223827379U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sampling probe technology, and more specifically, to a multi-sealed sampling probe. Background Technology
[0002] Currently used CEMS sampling probes operate in harsh environments and require no maintenance throughout the year, making the probe's sealing function crucial. Poor sealing can allow coal ash to enter the sampling pipeline, clogging it and rendering it unusable. It can also enter the measuring instrument, causing malfunctions, affecting normal measurements, and increasing maintenance work. To improve probe quality and meet various harsh environmental conditions, the probe itself has enhanced sealing capabilities, employing multiple seals to improve the dustproof function of the probe cavity, reduce instrument failure rates, and ensure safe and reliable instrument operation.
[0003] In existing technologies, the sealing performance of sampling probes is relatively poor during use, which can easily clog the sampling pipeline. Therefore, we have made improvements to this by proposing a multi-sealed sampling probe. Utility Model Content
[0004] The purpose of this invention is to address the problem that current sampling probes have poor sealing performance and are prone to clogging the sampling pipeline.
[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:
[0006] A multi-sealed sampling probe is proposed to improve the above-mentioned problems.
[0007] The application is as follows:
[0008] A multi-sealed sampling probe includes a sampling probe and a probe cavity. The inner end of the probe cavity is provided with a filter element assembly, which includes a filter element locking nut, a ceramic filter element, and a filter element screw rod. A cavity O-ring is provided between the filter element screw rod and the probe cavity. An outer filter element fixing O-ring and an inner filter element fixing O-ring are respectively provided between the ceramic filter element and the filter element locking nut, and between the filter element screw rod and the ceramic filter element.
[0009] As a preferred technical solution of this application, the inner O-ring of the filter element fixing is located inside the outer O-ring of the filter element fixing.
[0010] As a preferred technical solution of this application, the O-ring of the cavity, the outer O-ring of the filter element fixing, and the inner O-ring of the filter element fixing are made of fluororubber.
[0011] As a preferred technical solution of this application, the filtration accuracy of the ceramic filter element is 0.1 to 0.5 μm.
[0012] As a preferred technical solution in this application, the probe cavity is made of stainless steel 316L.
[0013] As a preferred technical solution of this application, the left end of the probe cavity is provided with a probe flue gas inlet, and the right end of the probe cavity is provided with a probe flue gas outlet and a probe backflushing gas interface.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] In the scheme of this application:
[0016] 1. Through the efficient dustproof seal and the use of a multi-seal design, the double barrier of the cavity O-ring seal, the filter element fixing O-ring seal outer ring and the filter element fixing O-ring seal inner ring can effectively block the coal ash in the flue gas outside the ceramic filter element and inside the probe cavity, greatly improving the dustproof function of the probe cavity.
[0017] 2. Ensures stable instrument operation. The good dustproof effect reduces the damage to the instrument caused by impurities such as coal ash, reduces the instrument failure rate, ensures the safe and reliable operation of the instrument, and improves the stability and service life of the equipment.
[0018] 3. Excellent filtration performance: The ceramic filter element has a filtration accuracy of 0.1-0.5um, which can effectively filter out tiny particles in the flue gas, ensuring the quality of the dust removal flue gas entering the subsequent measurement stage and improving the accuracy of the measurement.
[0019] 4. High material durability: The probe cavity is made of 316L stainless steel, which has good corrosion resistance; the filter element screw rod and filter element locking nut are all made of 316L stainless steel, and the fluororubber O-ring has good sealing performance and chemical stability. These material choices ensure that the entire sampling probe can work stably for a long time in complex environments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a multi-sealed sampling probe provided in this application.
[0021] The image shows:
[0022] 1. Probe cavity; 2. Filter element screw rod; 3. Cavity O-ring seal; 4. Filter element fixing O-ring outer ring; 5. Filter element fixing O-ring inner ring; 6. Filter element locking nut; 7. Ceramic filter element. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.
[0024] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely illustrates some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments, features, and technical solutions in the embodiments of this utility model can be combined with each other.
[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0026] like Figure 1 As shown, this embodiment proposes a multi-sealed sampling probe, including a sampling probe and a probe cavity 1. The inner end of the probe cavity 1 is provided with a filter element assembly, which includes a filter element locking nut 6, a ceramic filter element 7, and a filter element screw rod 2. A cavity O-ring seal 3 is provided between the filter element screw rod 2 and the probe cavity 1. A filter element fixing O-ring seal outer ring 4 and a filter element fixing O-ring seal inner ring 5 are respectively provided between the ceramic filter element 7 and the filter element locking nut 6, and between the filter element screw rod 2 and the ceramic filter element 7.
[0027] The inner O-ring 5 of the filter element fixing O-ring is located inside the outer O-ring 4 of the filter element fixing O-ring.
[0028] The O-ring 3 for the cavity, the outer O-ring 4 for fixing the filter element, and the inner O-ring 5 for fixing the filter element are all made of fluororubber.
[0029] The filtration accuracy of ceramic filter element 7 is 0.1 to 0.5 μm.
[0030] The probe cavity 1 is made of stainless steel 316L.
[0031] The left end of the probe cavity 1 is provided with a probe flue gas inlet, and the right end of the probe cavity 1 is provided with a probe flue gas outlet and a probe backflushing gas interface.
[0032] The filter element uses a ceramic filter element 7, with dimensions of DN50*20*136, resistant to acids and alkalis, and a filtration accuracy of 0.1~0.5um. The filter element screw rod 2 and the filter element locking nut 6 are both made of 316L stainless steel. The filter element is sealed with a radial double seal using fluororubber O-rings. The outer ring of the filter element's fixing O-ring seal 4 is a fluororubber O-ring with an outer diameter of 44*3.5; the inner ring of the filter element's fixing O-ring seal 5 is a fluororubber O-ring with an outer diameter of 32*3.5.
[0033] The probe cavity 1 is made of 316L stainless steel, cylindrical in shape, and fixed with a flange interface;
[0034] It features a double-layer axial seal with the filter assembly, and is the same specification and model as the backflush seal and rear end seal, with a total of 4 chambers and 3 O-ring seals. All O-rings are made of fluororubber, with an inner diameter of 53*2.65.
[0035] All interfaces of the probe cavity 1, including the output (sample gas) interface and the full calibration interface, adopt G1 / 4 internal thread interfaces.
[0036] Flue gas inlet, G1 / 2 internal thread interface.
[0037] Output (sample gas) interface, G1 / 4 internal thread interface
[0038] Taking a large thermal power plant's CEMS (Continuous Emission Monitoring System) for flue gas as an example:
[0039] (1) Installation phase:
[0040] Install the multi-sealed sampling probe in the designated position according to the design requirements. Secure the probe cavity 1 firmly through the flange interface. Connect all interfaces and connect the flue gas inlet pipe to the G1 / 2 internal thread interface at the flue gas inlet of the probe tightly to ensure no leakage. Connect the sampling pipeline to the G1 / 4 internal thread interface at the flue gas outlet of the probe to deliver the filtered sample gas to the main meter for measurement. At the same time, connect the probe backflushing gas interface for subsequent backflushing maintenance operations.
[0041] (2) Operation phase
[0042] During normal operation of the power plant's CEMS (Continuous Emission Monitoring System) for flue gas, flue gas is drawn in through the flue gas inlet at the front end of the probe cavity 1. At this point, the multi-layered sealing structure comes into play. The cavity's O-ring seal first provides an initial seal between the probe cavity 1 and the outside environment, preventing external dust and other impurities from entering. Next, the flue gas enters the probe cavity 1 and encounters the filter assembly. The radial double-sealing structure, consisting of the outer and inner O-ring seals of the filter element, further prevents coal ash in the flue gas from entering the ceramic filter element 7. The coal ash is blocked on the outer surface of the ceramic filter element 7 and the inner wall of the probe cavity 1. Only dust-collected flue gas meeting the filtration accuracy requirements (0.1–0.5 μm) can pass through the ceramic filter element 7 and enter its interior.
[0043] The dust-removed flue gas, after being filtered by the ceramic filter element 7, flows along the internal passage of the ceramic filter element 7 and finally flows out from the flue gas outlet interface of the probe. It is then sent to the main meter for precise measurement through the sampling pipeline sample gas pipeline, thereby obtaining accurate flue gas emission data.
[0044] (3) Maintenance phase
[0045] Regularly use the probe backflushing gas interface to connect backflushing gas to clean the probe cavity 1 and ceramic filter element 7. Due to the existence of the multiple sealing structure, the sealing performance will not be affected during the backflushing process. It can also effectively remove impurities such as coal ash accumulated on the outside of the ceramic filter element 7 and inside the probe cavity 1, maintain the good working condition of the sampling probe, further ensure the stable operation of the entire CEMS system, reduce instrument failures caused by blockage and other problems, and extend the service life of the equipment.
[0046] When this application is in use: During the operation of the CEMS continuous emission monitoring system for power plant flue gas, flue gas is drawn in from the flue gas inlet interface at the front end of the probe cavity 1 and sent into the probe cavity 1. Due to the double barrier of the cavity O-ring seal 3, the outer O-ring seal 4 for fixing the filter element, and the inner O-ring seal 5 for fixing the filter element, all the coal ash in the flue gas is blocked outside the ceramic filter element 7 and inside the probe cavity 1. The dust-removed flue gas can only enter the interior of the ceramic filter element 7 after being filtered by the ceramic filter element 7, and then through the internal passage, and finally sent to the main instrument for measurement through the sampling pipeline sample gas pipeline from the probe flue gas outlet interface. The sealing function of the probe itself is improved, and multiple seals are used to improve the dustproof function of the probe cavity 1, reduce the instrument failure rate, and ensure the safe and reliable operation of the instrument.
[0047] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.
Claims
1. A multi-sealed sampling probe, comprising a sampling probe and a probe cavity (1), characterized in that, The inner end of the probe cavity (1) is provided with a filter element assembly, which includes a filter element locking nut (6), a ceramic filter element (7) and a filter element screw rod (2). A cavity O-ring seal (3) is provided between the filter element screw rod (2) and the probe cavity (1). A filter element fixing O-ring seal outer ring (4) and a filter element fixing O-ring seal inner ring (5) are respectively provided between the ceramic filter element (7) and the filter element locking nut (6), and between the filter element screw rod (2) and the ceramic filter element (7).
2. The sampling probe with multiple seals according to claim 1, characterized in that, The filter element fixing O-ring (5) is located inside the filter element fixing O-ring (4).
3. The sampling probe with multiple seals according to claim 2, characterized in that, The cavity O-ring (3), the filter element fixing O-ring outer ring (4), and the filter element fixing O-ring inner ring (5) are made of fluororubber.
4. The sampling probe with multiple seals according to claim 3, characterized in that, The filtration accuracy of the ceramic filter element (7) is 0.1 to 0.5 μm.
5. A sampling probe with multiple seals according to claim 4, characterized in that, The probe cavity (1) is made of stainless steel 316L.
6. A sampling probe with multiple seals according to claim 5, characterized in that, The left end of the probe cavity (1) is provided with a probe flue gas inlet, and the right end of the probe cavity (1) is provided with a probe flue gas outlet and a probe backflushing gas interface.