Front filtering and heating device for engine exhaust gas sampling

Abstract

The utility model relates to the technical field of engine waste gas sampling, and discloses an engine waste gas sampling preposed filtering and heating device which comprises a base, an upper seat, a center rod and an inner-layer cylinder wrapping barrel, the base and the upper seat are respectively connected with two ends of the inner-layer cylinder wrapping barrel, and an electric heating belt is wound on the outer wall of the inner-layer cylinder wrapping barrel. The electric heating belt is connected with an external electric heating device, the center rod is arranged in the inner-layer cylindrical wrapping barrel and connected with the base and the upper seat, the center rod is of a hollow structure, a plurality of gas filtering through holes are formed in the outer wall of the center rod, a filter element is arranged outside the center rod, and a waste gas inlet connector communicated with the center rod is arranged on the base. And the upper seat is connected with a waste gas outlet joint extending out of the inner-layer cylindrical wrapping barrel and the outer-layer cylindrical wrapping barrel. Impurity dust, solid carbon particles and oil liquid are filtered in the filter element, cleanliness and environmental protection are achieved, the filter element and heating materials are all purchased in the market and do not need to be specially customized, cost is saved, and the maintenance period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of engine exhaust gas sampling, in particular to a pre-filtering and heating device for engine exhaust gas sampling. Background Art

[0002] Gas measurement and analysis of exhaust pollutants from automotive or non-road internal combustion engines requires a gas emission measurement and analysis system, of which the pre-filtration and heating device is an important component. It filters impurities, dust, solid carbon particles, and oil in the engine exhaust, protecting the analyzer, sampling pump, heated sampling tube, etc. from contamination. At the same time, the device needs to be heated and kept at 180-210°C to prevent components such as total hydrocarbons (THC), non-methane hydrocarbons (NMHC), and nitrogen oxides (NOX) from being adsorbed by cooling or steam condensation, thereby avoiding affecting the numerical accuracy of the analyzer.

[0003] The exhaust gas flow from the outside to the inside of the filter element filtered by the filter element in the pre-filtration and heating device is filtered. The filtered impurities, dust, solid carbon particles, and oil accumulate on the outside of the filter element and are easily scattered to the outside to pollute the environment. The filter element must be replaced frequently, and the supply of parts depends on the product supplier. The component interface sizes of the gas emission measurement and analysis systems of different suppliers are independent systems and cannot be replaced with each other. Therefore, in the later use, maintenance and repair, it causes users to have high use and repair costs and a long supply cycle of repair parts. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing pre-filtering and heating devices are easy to pollute the environment and have high replacement and maintenance costs.

[0005] In order to solve the above technical problems, the technical solution of the utility model is to provide an engine exhaust gas sampling pre-filter and heating device, including a base, an upper seat, a center rod, an inner cylindrical wrapped barrel and an outer cylindrical wrapped barrel, the base and the upper seat are provided with bosses, the bosses on the base and the upper seat are respectively inserted into the two ends of the inner cylindrical wrapped barrel to form a seal, the outer cylindrical wrapped barrel is arranged outside the inner cylindrical wrapped barrel and the two ends are respectively connected to the base and the upper seat, a gap is provided between the inner cylindrical wrapped barrel and the outer cylindrical wrapped barrel, the inner cylindrical An electric heating belt is wrapped around the outer wall of the wrapped barrel, and the electric heating belt is connected to an external electric heating device. The center rod is arranged in the inner cylindrical wrapped barrel and connected to the base and the upper seat. The center rod is a hollow structure, and a plurality of air filter holes are provided on its outer wall. A filter element is provided on the outside of the center rod, and an exhaust gas inlet joint connected to the center rod is provided on the base. An inner cavity connected to the inner cylindrical wrapped barrel is provided on the boss of the upper seat, and an inner cavity hole is provided on the inner cavity, and an exhaust gas outlet joint extending out of the inner cylindrical wrapped barrel and the outer cylindrical wrapped barrel is connected to the inner cavity hole.

[0006] Optionally, both ends of the outer cylindrical wrapping barrel are connected to the base and the upper seat respectively through stainless steel cross countersunk screws.

[0007] Optionally, a temperature fuse is connected to the electric heating tape, and a PT100 thermal resistor is wrapped on the electric heating tape. Both the temperature fuse and the PT100 thermal resistor are connected to an external electric heating device through small holes on the outer cylindrical wrapping barrel.

[0008] Optionally, a protective silicone ring is provided in the small hole on the outer cylindrical wrapping barrel, one end of the center rod extends out of the upper seat, and a plastic handle is provided on the end of the center rod located outside the upper seat.

[0009] Optionally, a connecting inner hole is provided in the middle of the upper seat, and the connecting inner hole is located at the outer end of the inner cavity. A sealing boss is provided at the connection between the center rod and the upper seat, and the sealing boss is provided in the connecting inner hole.

[0010] Optionally, a plurality of sealing ring grooves are provided on the sealing boss, and an O-ring is provided in the sealing ring groove.

[0011] Optionally, a filter element conversion joint is provided at the connection between the center rod and the base, and the two ends of the filter element conversion joint are respectively connected to the center rod and the base, and a filter element shoulder is provided on the center rod near the inner cavity of the upper seat, and the center rod between the filter element shoulder and the base is a hollow structure, and a plurality of air filter holes are provided on the surface of the hollow part, and a filter element is provided on the center rod between the filter element conversion joint and the filter element shoulder, and a gap is provided between the filter element and the center rod.

[0012] Optionally, an exhaust gas inner tube is provided at the center of the base, a slot is provided on the base outside the exhaust gas inner tube, an internal thread and an external thread are provided on one end of the center rod connected to the base, the center rod is connected to the exhaust gas inner tube through the internal thread, and is connected to the filter element conversion joint through the external thread, and one end of the filter element conversion joint is inserted into the slot.

[0013] Optionally, an O-ring is provided between the slot and the filter element conversion joint, and the exhaust gas intake joint is plugged into the exhaust gas inner pipe.

[0014] To sum up, the utility model completes the sealing and filter element support construction through the combination of the filter element conversion joint and the center rod, and has a reliable structure. It filters impurities, dust, solid carbon particles, and oil inside the filter element through the internal exhaust gas channel, which is clean and environmentally friendly. The filter element and heating materials are all purchased from the market and do not need to be specially customized, which saves costs and shortens the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the appearance of the utility model;

[0017] Figure 3 This is a schematic diagram of the center rod assembly structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the upper seat structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the base structure of the utility model;

[0020] Figure 6 This is a schematic diagram of the center rod structure of the utility model;

[0021] In the figure: 1. Base; 11. Exhaust gas inner pipe; 13. Stainless steel cross countersunk screw; 14. Plastic handle; 15. Sheath silicone ring; 2. Upper seat; 21. Connecting inner hole; 22. Inner cavity; 23. Inner cavity hole; 3. Center rod; 31. Sealing boss; 32. Filter element shoulder; 33. Air filter hole; 4. Filter element conversion joint; 5. Inner cylindrical wrapped barrel; 6. Outer cylindrical wrapped barrel; 7. Filter element; 8. O-ring; 9. Exhaust gas inlet connector; 91. Exhaust gas outlet connector; 10. Electric heating belt. DETAILED DESCRIPTION

[0022] The following combination Figure 1-6 The utility model is described in further detail.

[0023] The utility model discloses a pre-filtering and heating device for sampling engine exhaust gas, referring to Figure 1 and Figure 2 , including a base 1, an upper seat 2, a center rod 3, an inner cylindrical wrapped barrel 5 and an outer cylindrical wrapped barrel 6, the base 1 and the upper seat 2 are provided with bosses, the bosses on the base 1 and the upper seat 2 are respectively inserted into the two ends of the inner cylindrical wrapped barrel 5 to form a seal, the outer cylindrical wrapped barrel 6 is arranged outside the inner cylindrical wrapped barrel 5 and the two ends are respectively connected to the base 1 and the upper seat 2, a gap is provided between the inner cylindrical wrapped barrel 5 and the outer cylindrical wrapped barrel 6, the outer wall of the inner cylindrical wrapped barrel 5 is wrapped with an electric belt 10, the electric belt 10 is connected to the external electric heating device, the center rod 3 is provided in the inner cylindrical wrapped barrel 5 and connected to the base 1 and the upper seat 2, the center rod 3 is a hollow structure, and a plurality of air filter holes 33 are provided on its outer wall. A filter element 7 is provided on the outside of the center rod 3, and an exhaust gas inlet connector 9 connected to the center rod 3 is provided on the base 1. An inner cavity 22 connected to the inner cylindrical wrapped barrel 5 is provided on the boss of the upper seat 2, and an inner cavity hole 23 is provided on the inner cavity 22. An exhaust gas outlet connector 91 extending from the inner cylindrical wrapped barrel 5 and the outer cylindrical wrapped barrel 6 is connected to the inner cavity hole 23. The two ends of the outer cylindrical wrapped barrel 6 are respectively connected to the base 1 and the upper seat 2 by stainless steel cross countersunk screws 13.

[0024] In a further embodiment, referring to Figure 1The electric heating tape 10 is connected to a temperature fuse, and the electric heating tape 10 is wrapped with a PT100 thermal resistor. The temperature fuse and the PT100 thermal resistor are connected to the external electric heating device through the small holes on the outer cylindrical wrapping barrel 6. A sheath silicone ring 15 is provided in the small hole on the outer cylindrical wrapping barrel 6. One end of the center rod 3 extends out of the upper seat 2. A plastic handle 14 is provided on the end of the center rod 3 located outside the upper seat 2. The sheath silicone ring 15 and the plastic handle 14 are used to protect the electric heating tape 10.

[0025] In a further embodiment, referring to Figure 4 A connecting inner hole 21 is provided in the middle of the upper seat 2, and the connecting inner hole 21 is located at the outer end of the inner cavity 22. A sealing boss 31 is provided at the connection between the center rod 3 and the upper seat 2. The sealing boss 31 is arranged in the connecting inner hole 21, and a plurality of sealing ring grooves are provided on the sealing boss 31, and an O-ring 8 is provided in the sealing ring groove.

[0026] In a further embodiment, referring to Figure 3 、 Figure 5 and Figure 6 A filter element conversion joint 4 is provided at the connection between the center rod 3 and the base 1, and both ends of the filter element conversion joint 4 are connected to the center rod 3 and the base 1 respectively. A filter element shoulder 32 is provided on the center rod 3 near the inner cavity 22 of the upper seat 2. The center rod 3 between the filter element shoulder 32 and the base 1 is a hollow structure, and a plurality of air filter holes 33 are provided on the surface of the hollow part. A filter element 7 is sleeved on the center rod 3 between the filter element conversion joint 4 and the filter element shoulder 32, and a gap is provided between the filter element 7 and the center rod 3. An exhaust gas inner tube 11 is provided at the center part of the base 1, and a slot is provided on the base 1 outside the exhaust gas inner tube 11. An internal thread and an external thread are provided on the end where the center rod 3 is connected to the base 1. The center rod 3 is connected to the exhaust gas inner tube 11 through the internal thread and is connected to the filter element conversion joint 4 through the external thread. One end of the filter element conversion joint 4 is inserted into the slot, and an O-ring 8 is provided between the slot and the filter element conversion joint 4. The exhaust gas intake joint 9 is plugged into the exhaust gas inner tube 11.

[0027] Example

[0028] In this embodiment, the base 1 and the upper seat 2 are welded and sealed with the inner cylindrical wrapping barrel 5 , and the plastic handle 14 is threadedly connected to the upper seat 2 .

[0029] The filter element conversion joint 4 is installed on the M16 external thread of the center rod 3 through an M16 fine thread. The filter element conversion joint 4 is provided with a shoulder corresponding to the filter element shoulder 32 of the center rod 3. The shoulder on the filter element conversion joint 4 and the filter element shoulder 32 of the center rod 3 support the filter element 7 together. The screw-in length of the fine thread of the filter element conversion joint 4 is determined according to the distance between the filter element conversion joint 4 and the filter element shoulder 32 of the center rod 3, ensuring that the contact surface of the filter element 7 between the filter element conversion joint 4 and the filter element shoulder 32 of the center rod 3 is tightly sealed and the filter element 7 is not squeezed and deformed.

[0030] During assembly, an O-ring 8 is set on the filter element conversion joint 4, and is screwed tight through the M12 internal thread of the center rod 3 and the M12 external thread on the base 1. In this way, the O-ring 8 groove of the filter element conversion joint 4 enters the slot on the base 1 to form a seal. After the electric heating belt 10 is connected in series with the temperature fuse, it passes through the outer cylindrical wrapping barrel 6. The hole is connected to the external electric heating device through the external power line, and the electric heating belt 10 is wound to avoid the inner cylindrical wrapping barrel 5 for passing through the exhaust outlet joint 91 Through hole, the temperature signal line of PT100 thermal resistor passes through the outer cylindrical wrap barrel 6 The hole is connected to the controller signal line of the external electric heating device.

[0031] When the utility model is in use, the exhaust gas inlet connector 9 is connected to the sampling probe that penetrates into the exhaust pipe, and the exhaust gas outlet connector 91 is connected to the heated sampling tube;

[0032] The exhaust gas of the internal combustion engine passes through the sampling probe deep into the exhaust pipe, then enters the pre-filtration and heating device through the exhaust gas inlet connector 9, enters the center rod 3 through the exhaust gas inner tube 11 of the upper seat 1, and then enters the filter element 7 through the air filter through hole 33 on the center rod 3, filtering the impurities, dust, solid carbon particles and oil in the exhaust gas of the internal combustion engine inside the filter element 7. The filtered exhaust gas enters the inner cavity 22 of the upper seat 2 along the space around the filter element 7, and is led out of the pre-filtration and heating device by the exhaust gas outlet connector 91 connected to the inner cavity hole 23, and enters the heated sampling tube to complete the filtering function;

[0033] When the exhaust gas enters the filter element 7, the electric heating belt 10 is energized to heat the inner cylindrical wrapped barrel 5, thereby increasing the temperature of the exhaust gas inside the inner cylindrical wrapped barrel 5. The temperature sensing unit of the PT100 thermal resistor is buried in the electric heating belt 10 and fully contacts and senses the heating temperature of the electric heating belt 10, thereby adjusting the heating temperature and completing the heating function.

[0034] The filter element 7 and heating materials such as the electric heating belt 10 of the present invention are all purchased from the market and do not need to be specially customized, which saves costs and shortens the maintenance cycle.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A pre-filtering and heating device for sampling engine exhaust gas, characterized in that: The utility model comprises a base (1), an upper seat (2), a center rod (3), an inner cylindrical wrapped barrel (5) and an outer cylindrical wrapped barrel (6), wherein the base (1) and the upper seat (2) are provided with bosses, and the bosses on the base (1) and the upper seat (2) are respectively inserted into the two ends of the inner cylindrical wrapped barrel (5) to form a seal, and the outer cylindrical wrapped barrel (6) is arranged outside the inner cylindrical wrapped barrel (5) and the two ends are respectively connected to the base (1) and the upper seat (2), and a gap is provided between the inner cylindrical wrapped barrel (5) and the outer cylindrical wrapped barrel (6), and the outer wall of the inner cylindrical wrapped barrel (5) is wound with an electric heating belt (10), and the electric heating belt (10) is connected to the external electric heating device. The center rod (3) is arranged in the inner cylindrical wrapped barrel (5) and is connected to the base (1) and the upper seat (2). The center rod (3) is a hollow structure, and a plurality of air filter holes (33) are provided on its outer wall. A filter element (7) is provided on the outside of the center rod (3). The base (1) is provided with an exhaust gas inlet joint (9) connected to the center rod (3). The boss of the upper seat (2) is provided with an inner cavity (22) connected to the inner cylindrical wrapped barrel (5). The inner cavity (22) is provided with an inner cavity hole (23). The inner cavity hole (23) is connected to an exhaust gas outlet joint (91) extending from the inner cylindrical wrapped barrel (5) and the outer cylindrical wrapped barrel (6).

2. The engine exhaust gas sampling pre-filter and heating device according to claim 1, characterized in that: The two ends of the outer cylindrical wrapping barrel (6) are respectively connected to the base (1) and the upper seat (2) via stainless steel cross countersunk screws (13).

3. The engine exhaust gas sampling pre-filter and heating device according to claim 1, characterized in that: The electric heating belt (10) is connected to a temperature fuse, and the electric heating belt (10) is wrapped with a PT100 thermal resistor. The temperature fuse and the PT100 thermal resistor are both connected to an external electric heating device through a small hole on the outer cylindrical wrapping barrel (6).

4. The engine exhaust gas sampling pre-filter and heating device according to claim 3, characterized in that: A protective silicone ring (15) is provided in the small hole on the outer cylindrical wrapping barrel (6), one end of the center rod (3) extends out of the upper seat (2), and a plastic handle (14) is provided on the end of the center rod (3) located outside the upper seat (2).

5. The engine exhaust gas sampling pre-filter and heating device according to claim 1, characterized in that: A connecting inner hole (21) is provided in the middle of the upper seat (2), and the connecting inner hole (21) is located at the outer end of the inner cavity (22). A sealing boss (31) is provided at the connection between the center rod (3) and the upper seat (2), and the sealing boss (31) is arranged in the connecting inner hole (21).

6. The engine exhaust gas sampling pre-filter and heating device according to claim 5, characterized in that: The sealing boss (31) is provided with a plurality of sealing ring grooves, and an O-type sealing ring (8) is provided in the sealing ring grooves.

7. The engine exhaust gas sampling pre-filter and heating device according to claim 1, characterized in that: A filter element conversion joint (4) is provided at the connection between the center rod (3) and the base (1), and the two ends of the filter element conversion joint (4) are respectively connected to the center rod (3) and the base (1). A filter element shoulder (32) is provided on the center rod (3) near the inner cavity (22) of the upper seat (2). The center rod (3) between the filter element shoulder (32) and the base (1) is a hollow structure, and a plurality of air filter holes (33) are provided on the surface of the hollow part. A filter element (7) is sleeved on the center rod (3) between the filter element conversion joint (4) and the filter element shoulder (32), and a gap is provided between the filter element (7) and the center rod (3).

8. The engine exhaust gas sampling pre-filter and heating device according to claim 7, characterized in that: An exhaust gas inner tube (11) is provided at the center of the base (1), a slot is provided on the base (1) outside the exhaust gas inner tube (11), an end of the center rod (3) connected to the base (1) is provided with an internal thread and an external thread, the center rod (3) is connected to the exhaust gas inner tube (11) via the internal thread, and is connected to the filter element conversion joint (4) via the external thread, and one end of the filter element conversion joint (4) is inserted into the slot.

9. The engine exhaust gas sampling pre-filter and heating device according to claim 8, characterized in that: An O-type sealing ring (8) is provided between the slot and the filter element conversion joint (4), and the exhaust gas intake joint (9) is plugged into the exhaust gas inner pipe (11).

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