Convenient gas sampling pipe with efficient condensation and dry filtration functions

Abstract

The invention provides a portable gas sampling pipe with efficient condensation and dry filtration. The portable gas sampling pipe comprises a sampling handle, an efficient condenser is mounted at the rear end of the sampling handle, an inner and outer pipe adapter and a gas-water separation filter are mounted in the sampling handle, an inner pipe is inserted into the inner and outer pipe adapter and connected with the efficient condenser through a gas pipe, and an outer pipe is mounted at the front end of the inner pipe in a sleeving manner; the efficient condenser comprises a cooling fan, a radiator, a semiconductor chilling plate, a heat conducting plate and a vortex-shaped flow channel which are attached in sequence, and the air outlet end of the vortex-shaped flow channel is connected with the air-water separation filter. The device integrates the functions of sampling, pressure measurement, temperature measurement, condensation and dry filtration, is compact in overall structure, and can be suitable for small-space sampling. The sample gas is efficiently cooled and dehumidified in a limited space through a unique vortex-shaped flow channel and a refrigeration heat dissipation structure in the efficient condenser, the gas-water separation filter is a device integrating gas-water separation and gas filtration, and the gas-water separation efficiency can be improved through the unique structures of the ends of the gas inlet rod and the waterproof rod.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of gas sampling equipment, and particularly relates to a portable gas sampling tube with efficient condensation and dry filtration. BACKGROUND

[0002] The portable gas sampler is a movable gas collection device, mainly used for sample collection in on-site gas detection. The structure takes the host as the core and is used in combination with auxiliary components such as a gas sampling tube. The gas sampling tube needs to have the functions of gas cooling, gas drying, temperature measurement and pressure measurement, and is internally provided with a gas cooling module, a drying module, a temperature measurement module, a gas pressure detection module and the like, so that the sampling tube has a large volume and a long length. The traditional gas sampling tube has a large size, but the operable space of most gas sampling sites at home and abroad is relatively compact. Carrying a long sampling tube to operate on the sampling platform requires high quality of the sampling personnel and has safety hazards.

[0003] In view of the above problems, there are many small portable gas sampling tubes in the prior art, but they all need external gas cooling modules, drying modules, temperature measurement modules, gas pressure detection modules and the like. Such sampling tubes have many external interfaces and are complex to operate, and are prone to misconnection. When sampling a gas containing moisture, the gas temperature needs to be cooled to below 50 DEG C first. The traditional cooling module has low heat exchange efficiency and short flow channel, and cannot accurately control the temperature. The water vapor in the gas cannot be fully condensed, and the gas is not fully cooled, which affects the service life of the rear-end gas sensor. SUMMARY

[0004] The present application proposes a portable gas sampling tube with efficient condensation and dry filtration, which has an internal high-efficiency condenser and a gas-water separation filter, and a compact structure, in order to solve the technical problems of the prior art that the gas sampling tube has many external modules and is complex to assemble and operate, and the gas cooling module has a short flow channel and low cooling efficiency.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A portable gas sampling tube with efficient condensation and dry filtration, comprising a sampling handle, a high-efficiency condenser installed at the rear end of the sampling handle, an internal-external tube adapter and a gas-water separation filter installed in the sampling handle, an internal tube inserted into the sampling handle and connected with the high-efficiency condenser through a gas tube, and an external tube sleeved on the front end of the internal tube. The high-efficiency condenser comprises, in sequence, a cooling fan, a radiator, a semiconductor refrigeration sheet, a heat conduction sheet and a vortex flow channel. An air inlet is arranged at the center of the vortex flow channel, the air inlet is connected with the gas outlet end of the internal tube, the gas outlet end of the vortex flow channel is connected with the gas-water separation filter through an air outlet tube, and the gas flow enters the vortex flow channel from the air inlet at the center of the vortex flow channel and then rotates to flow out of the air outlet tube. The gas outlet end of the gas-water separation filter is connected with a sampling air nozzle installed on the sampling handle.

[0006] As preferred, the air-water separation filter comprises a cylinder body, an air inlet rod extending into the cylinder body is arranged on the top wall of the cylinder body, an air outlet hole is arranged at the lower part of the air inlet rod, and an upper baffle is connected to the end of the air inlet rod; a filter core is mounted at the bottom of the cylinder body, a gland pressing the filter core is arranged above the filter core, a waterproof rod is connected to the gland, an air inlet hole is arranged at the top end of the waterproof rod and below the lower baffle, and an air outlet rod is arranged on the bottom wall of the cylinder body.

[0007] As preferred, a liquid level sensor and a humidity sensor are arranged inside the waterproof rod close to the top end.

[0008] As preferred, the air outlet pipe comprises a connecting pipe and an air outlet nozzle, and the connecting pipe is arranged obliquely downward.

[0009] As preferred, a thermocouple is arranged between the inner pipe and the outer pipe, a thermocouple plug connected to the thermocouple is arranged in the sampling handle, and a waterproof joint connected to the thermocouple plug is arranged on the shell of the sampling handle.

[0010] As preferred, a first pressure measuring air nozzle is mounted on the inner-outer pipe adapter, a second pressure measuring air nozzle is arranged on the shell of the sampling handle, and the first pressure measuring air nozzle and the second pressure measuring air nozzle are connected through a pipeline.

[0011] As preferred, the heat-conducting sheet comprises a honeycomb-shaped silicone rubber base, and boron nitride sheets are filled in the honeycomb holes.

[0012] As preferred, the heat sink comprises heat dissipation fins made of aluminum alloy, and the height of the heat dissipation fins is 8-12 times the sum of the fin thickness and the distance between two fins.

[0013] As preferred, the cylinder body is made of transparent and corrosion-resistant plastic.

[0014] As preferred, the cylinder body is divided into an upper cylinder body and a lower cylinder body, and the gland is mounted between the upper cylinder body and the lower cylinder body.

[0015] Compared with the prior art, the application has the following advantages and positive effects: The inner pipe and the outer pipe in the portable gas sampling pipe can be flexibly replaced according to specific use conditions, and can be suitable for different sampling spaces; the inner pipe and the outer pipe are made of titanium alloy and coated with a polytetrafluoroethylene coating inside, which can effectively reduce gas surface adsorption and corrosion and improve detection accuracy.

[0016] (2) The portable gas sampling pipe adopts a high-efficiency condenser, and the unique vortex flow channel and refrigeration heat dissipation structure inside the condenser enable the sample gas to flow in a limited space and achieve high-efficiency cooling and dehumidification.

[0017] (3) The gas-water separation filter of the portable gas sampling pipe integrates gas-water separation and gas filtration, the baffle is arranged on the air inlet rod and the waterproof rod, the gas-water separation efficiency can be increased, the liquid level sensor and the humidity sensor are arranged in the waterproof rod, the water level and the gas humidity are effectively monitored, and the water inlet failure of the sampling host is avoided.

[0018] (4) The portable gas sampling pipe integrates gas sampling, temperature measurement, pressure measurement, cooling, drying and filtration functions, has compact overall structure, and part of modules can be flexibly detached, so that the module performance can be adjusted according to the working condition and the later maintenance and repair are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the portable gas sampling pipe of the present application. Figure 2 It is a structure schematic view of the high-efficiency condenser of the portable gas sampling pipe of the present application. Figure 3 It is a structure schematic view of the vortex flow channel of the portable gas sampling pipe of the present application. Figure 4 It is a structure schematic view of the gas-water separation filter of the portable gas sampling pipe of the present application.

[0020] Figure 5 It is Figure 4 It is a middle AA direction sectional view.

[0021] In the above figures: 1, sampling handle; 11, shell; 12, sampling gas nozzle; 2, inner pipe; 3, outer pipe; 31, pressure cap; 4, inner-outer pipe adapter; 5, high-efficiency condenser; 51, cooling fan; 52, radiator; 521, fin; 53, semiconductor refrigerating sheet; 54, heat-conducting sheet; 55, vortex flow channel; 551, air inlet; 552, vortex groove; 553, air outlet; 56, air inlet nozzle; 57, connecting pipe; 58, air outlet nozzle; 6, temperature measurement module; 61, thermocouple; 62, thermocouple plug; 63, waterproof joint; 7, pressure measurement module; 71, first pressure measurement gas nozzle; 72, second pressure measurement gas nozzle; 8, gas-water separation filter; 81, cylinder body; 811, top wall; 812, side wall; 813, bottom wall; 814, upper cylinder body; 815, lower cylinder body; 82, air inlet rod; 821, air outlet hole; 822, upper baffle; 83, waterproof rod; 831, lower baffle; 832, air inlet hole; 84, air outlet rod; 85, gland; 86, filter element. DETAILED DESCRIPTION

[0022] In order to better understand the present application, the following will be specifically described in combination with the drawings and examples.

[0023] Example: as Figure 1As shown, a portable gas sampling tube with efficient condensation and drying, comprising a sampling handle 1, an inner tube 2, an outer tube 3, an efficient condenser 5, a gas-water separation filter 8, a temperature measurement module 6 and a pressure measurement module 7. The gas sampling tube integrates gas sampling, temperature measurement, pressure measurement, cooling, drying and filtering into one, with compact overall structure.

[0024] The sampling handle 1 includes a shell 11, inside which is installed an inner-outer tube adapter 4 and a gas-water separation filter 8. The front end of the inner-outer tube adapter 4 extends forward to the outside of the sampling handle 1 and is fixed on the shell 11.

[0025] The inner tube 2 is inserted into the sampling handle 1 from the front end of the sampling handle 1 and is fixed in the inner-outer tube adapter 4. The front end of the inner tube 2 is sleeved with the outer tube 3, which is connected to the front end of the shell 11 or the front end of the inner-outer tube adapter 4 through a pressure cap 31. The efficient condenser 5 is installed at the rear end of the sampling handle 1 in a movable connection. The gas outlet end of the inner tube 2 is connected to the efficient condenser 5 through a gas pipe. The gas outlet end of the efficient condenser 5 is connected to the gas-water separation filter 8. The gas outlet end of the gas-water separation filter 8 is connected to a sampling nozzle 12 installed on the sampling handle 1, which is used to connect to a sampling host. The sample gas enters the sampling handle 1 through the inner tube 2, is cooled by the efficient condenser 5, enters the gas-water separation filter 8, and is discharged after gas-water separation and drying.

[0026] The inner tube 2 and the outer tube 3 are made of TC4 titanium alloy material with good corrosion resistance, and the inner wall is coated with a polytetrafluoroethylene coating to reduce gas adsorption and enhance the corrosion resistance of the substrate. The inner tube 2 and the outer tube 3 are configured in multiple models, such as 300mm, 500mm, 800mm, 1000mm and different lengths. The appropriate size can be replaced according to the actual working conditions of the sampling site to adapt to the best sampling conditions.

[0027] As shown in Figure 2 The efficient condenser 5 includes, in sequence, a cooling fan 51, a radiator 52, a semiconductor refrigeration sheet 53, a heat conduction sheet 54 and a vortex flow channel 55. The center of the vortex flow channel 55 is provided with an air inlet nozzle 56 connected to the gas outlet end of the inner tube 2. The gas outlet end of the vortex flow channel 55 is connected to the gas-water separation filter 8 through a gas outlet pipe. The gas flow enters the vortex flow channel 55 from the air inlet nozzle 56 at the center and then rotates and flows out from the gas outlet pipe. The gas outlet pipe includes a connecting pipe 57 and a gas outlet nozzle 58, and the connecting pipe 57 is inclined downward to smoothly discharge the condensed water.

[0028] The semiconductor cooling chip 53 serves as the cold source for the high-efficiency condenser 5, utilizing the Peltier effect to achieve cooling. The side of the semiconductor cooling chip 53 in contact with the heat-conducting plate 54 is the cold end, and the side in contact with the plane of the heat sink 52 is the hot end. The heat-conducting plate 54 uses honeycomb-shaped silicone rubber as its base, with boron nitride sheets filled within the honeycomb pores to achieve excellent thermal conductivity. The heat sink 52 is made of aluminum alloy with high thermal conductivity, and the height of its fins 521 is 10 times the sum of the fin thickness and the distance between two fins 521, resulting in extremely high heat dissipation efficiency. The cooling fan 51 contacts the fin surface 521 of the heat sink 52 to dissipate heat to the external environment in a timely manner. The heat-conducting plate 54 is sealed to the vortex surface of the vortex channel 55, serving as a sealing material to ensure the vortex surface of the vortex channel 55 is sealed and to prevent gas from flowing through the channel.

[0029] like Figure 3 As shown, the vortex channel 55 consists of an air inlet 551, a vortex groove 552, and an air outlet 553. The vortex channel 55 maximizes the use of the limited heat dissipation area, increases the condensation path of the gas, and allows the gas to diffuse from the inside to the outside, thus effectively cooling the gas.

[0030] At the start of sampling, the hot, humid sample gas flows along the inner tube 2 through the condenser inlet 56 and into the inlet of the vortex channel 55. With the diffusion of the gas itself and the suction of the external air pump, the sample gas flows from the inside to the outside of the vortex groove 552 into the outlet. Under the action of the semiconductor cooling chip 53 and the heat-conducting plate 54, the condenser continuously exchanges heat with the gas. Simultaneously, the radiator 52 and the cooling fan continuously diffuse the heat dissipated by the entire system into the external environment, maintaining a stable operating temperature inside the high-efficiency condenser 5. The main unit can adjust the operating power of the semiconductor cooling chip 53 in real time according to the sample gas temperature measured by the thermocouple 61, thereby ensuring that the sample gas discharged from the condenser outlet 58 is always maintained at approximately 30°C.

[0031] The temperature measurement module 6 includes a thermocouple 61, a thermocouple plug 62, and a waterproof connector 63. The thermocouple 61 is installed in the gap between the inner tube 2 and the outer tube 3, located at the front end. The thermocouple plug 62 is located inside the sampling handle 1, and the thermocouple 61 and the thermocouple plug 62 are connected by a wire. Simultaneously, the outer shell 11 of the sampling handle 1 is provided with a waterproof connector 63 connected to the thermocouple plug 62. The waterproof connector 63 is used to connect to the sampling host. The thermocouple 61 detects the temperature of the sample gas in real time during the sampling process and transmits the temperature signal to the sampling host. The thermocouple 61 can flexibly replace the insulation layer and wire core with different materials according to the temperature of the gas being measured, to be suitable for gas sampling under different operating conditions such as 260℃, 480℃, and 704℃.

[0032] The pressure measuring module 7 includes a first pressure measuring nozzle 71 and a second pressure measuring nozzle 72. The first pressure measuring nozzle 71 is mounted on the inner and outer tube adapter 4, and the second pressure measuring nozzle 72 is mounted on the outer shell 11 of the sampling handle 1. The first pressure measuring nozzle 71 and the second pressure measuring nozzle 72 are connected by a pipeline. The airflow enters the inner and outer tube adapter 4 through the gap between the inner tube 2 and the inner and outer tube adapter, enters the first pressure measuring nozzle 71 through the gap between the inner tube 2 and the inner and outer tube adapter, and finally flows through the second pressure measuring nozzle 72 located at the bottom of the handle shell 11. The second pressure measuring nozzle 72 is used to connect to the pressure sensor in the sampling host to realize real-time detection of the sample gas gauge pressure.

[0033] like Figure 4 , Figure 5 As shown, the gas-liquid separator filter 8 includes a cylindrical body 81, which comprises a top wall 811, a side wall 812, and a bottom wall 813. An inlet rod 82 extending from the outside into the cylindrical body 81 is provided on the top wall 811. The inlet rod 82 is connected to the outlet 58 of the condenser. An outlet hole 821 is provided at the lower part of the inlet rod 82, and an upper baffle 822 is connected to the end of the inlet rod 82. The sample gas and liquid, cooled by the condenser, enter the inlet rod 82 and collide with the upper baffle 822, then exit from the outlet hole 821 at the bottom. Uncondensed water vapor in the sample gas further liquefies and separates from the sample gas. A filter element 86 is installed at the bottom of the cylindrical body 81. The filter element 86 is a HEPA filter element 86 with a filtration accuracy of 0.3 μm and a filtration efficiency of over 99.97%. A pressure cap 85 is provided above the filter element 86 to press the filter element 86. The pressure cap 85 is installed inside the cylinder 81 and can apply a certain pressure to the filter element 86 to fix the filter element 86. A waterproof rod 83 is connected to the pressure cap 85. The lower end of the waterproof rod 83 passes through the pressure cap 85, and the upper end of the waterproof rod 83 is connected to a lower baffle 831. An air inlet 832 is provided below the lower baffle 831.

[0034] To facilitate observation of the water level inside the gas-water separator filter 8, the cylinder 81 is made of transparent and corrosion-resistant plastic, such as polycarbonate, polypropylene, or polyphenylene sulfide. Simultaneously, a viewing window is provided on the corresponding part of the outer shell 11 of the sampling handle 1, allowing direct observation of the water level from the outside. A liquid level sensor and a humidity sensor are installed near the top of the waterproof rod 83. When the liquid level sensor and humidity sensor detect that the condensate inside the cylinder 81 has reached its limit level or the sample gas humidity is too high, an early warning is issued, sampling is stopped, and staff are alerted to handle the situation promptly.

[0035] To facilitate the replacement of filter element 86 and the drainage of water, the cylinder 81 adopts a split structure, specifically divided into an upper cylinder 814 and a lower cylinder 815. Both the upper cylinder 814 and the lower cylinder 815 are connected to the pressure cap 85 by threads. After disassembly, the filter element 86 can be replaced directly or the condensate can be drained.

[0036] The sample gas flows through the high-efficiency condenser 5 and is cooled to about 30 DEG C, and then enters the upper cylinder 814 from the gas inlet rod 82. The sample gas and condensed water enter the upper cylinder 814 through the air holes at the bottom of the gas inlet rod 82 and gather at the bottom of the cylinder. In this process, the water vapor that has not been completely liquefied is further liquefied by impacting the lower baffle 831 at the bottom of the gas inlet rod 82. The dry gas enters the lower cylinder 815 through the air holes at the top of the water-proof rod 83, is filtered by the filter core 86, is further dried, and finally enters the sampling gas nozzle 12 through the gas outlet rod 84, and then enters the sampling host through the sampling gas nozzle 12.

[0037] The portable gas sampling tube of the present application integrates sampling, pressure measurement, temperature measurement, condensation and dry filtering functions, has compact overall structure, and can be applied to small space sampling. The unique vortex flow channel 55 and refrigeration heat dissipation structure inside the high-efficiency condenser 5 enable the sample gas to be efficiently cooled and dehumidified in limited space. The gas-water separation filter 8 is a device integrating gas-water separation and gas filtering. The unique structure of the end of the gas inlet rod 82 and the water-proof rod 83 can increase the gas-water separation efficiency.

[0038] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields. However, any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments, without departing from the technical solution of the present application, still falls within the protection scope of the present application.

Claims

1. A convenient gas sampling tube with high efficiency condensation and dry filtration, characterized in that: It includes a sampling handle, a high-efficiency condenser installed at the rear end of the sampling handle, an inner and outer tube adapter and a gas-water separator filter installed inside the sampling handle, an inner tube extending into the sampling handle is inserted into the inner and outer tube adapter, the inner tube is connected to the high-efficiency condenser via a gas tube, and an outer tube is fitted at the front end of the inner tube. The high-efficiency condenser includes a cooling fan, a radiator, a semiconductor cooling chip, a heat-conducting plate, and a vortex channel that are sequentially attached. An air inlet is located at the center of the vortex channel, and the air inlet is connected to the air outlet of the inner tube. The air outlet of the vortex channel is connected to a gas-water separator filter through an air outlet pipe. Airflow enters from the air inlet at the center of the vortex channel and then flows out through the air outlet pipe in a rotating manner. The air outlet of the gas-water separator filter is connected to a sampling nozzle installed on the sampling handle.

2. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: The air-water separator filter includes a cylindrical body. An air inlet rod extending into the cylindrical body is provided on the top wall of the cylindrical body. An air outlet hole is provided at the lower part of the air inlet rod. An upper baffle is connected to the end of the air inlet rod. A filter element is installed at the bottom of the cylindrical body. A pressure cap for pressing the filter element is provided above the filter element. A waterproof rod is connected to the pressure cap. A lower baffle is provided at the top of the waterproof rod, and an air inlet hole is provided below the lower baffle. An air outlet rod is provided on the bottom wall of the cylindrical body.

3. The convenient gas sampling tube with high-efficiency condensation and dry filtration according to claim 2, characterized in that: The waterproof rod is equipped with a liquid level sensor and a humidity sensor near the top.

4. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: The air outlet pipe includes a connecting pipe and an air outlet nozzle, with the connecting pipe being inclined downwards.

5. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: A thermocouple is provided between the inner tube and the outer tube. A thermocouple plug connected to the thermocouple is provided inside the sampling handle. A waterproof connector connected to the thermocouple plug is provided on the outer shell of the sampling handle.

6. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: The inner and outer tube adapter is equipped with a first pressure measuring nozzle, and the outer shell of the sampling handle is equipped with a second pressure measuring nozzle. The first and second pressure measuring nozzles are connected by a pipeline.

7. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: The heat-conducting sheet comprises a honeycomb silicone rubber matrix, with boron nitride sheets filling the honeycomb pores.

8. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 1, characterized in that: The radiator includes heat dissipation fins made of aluminum alloy, and the height of the heat dissipation fins is 8-12 times the sum of the fin thickness and the distance between the two fins.

9. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 2, characterized in that: The cylinder is made of transparent and corrosion-resistant plastic.

10. The convenient gas sampling tube with high efficiency condensation and dry filtration according to claim 2, characterized in that: The cylinder is divided into an upper cylinder and a lower cylinder, and a pressure cap is installed between the upper cylinder and the lower cylinder.

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