A semi-enclosed combustion test chamber for an oxygen sensor combustion test bench

Abstract

The application discloses a semi-closed combustion test cavity of an oxygen sensor combustion test bench, which comprises a combustion cavity, a heat dissipation cavity and a test cavity, one end of the combustion cavity is connected with one end of the heat dissipation cavity through a conical connecting pipe, the other end of the heat dissipation cavity is connected with the test cavity, and the other end of the combustion cavity is provided with an air inlet; the diameter of the heat dissipation cavity is the same as that of the test cavity; an air inlet pipe, an ignition device and a spin burner are arranged in the combustion cavity, the air inlet is communicated with the air inlet pipe, and the end of the air inlet pipe, which is away from the air inlet, is provided with the ignition device. The application can make the combustion area of the combustion cavity stably combust and generate large-flow tail gas, simulate the combustion tail gas of an automobile engine, realize the rapid switching of a simulated atmosphere, automatically ignite the combustion cavity, and enable the oxygen sensor combustion test bench to efficiently measure the electrical performance of the oxygen sensor.

Description

Technical Field

[0001] This invention relates to the field of combustion chamber technology, and in particular to a semi-enclosed combustion test chamber for an oxygen sensor combustion test bench. Background Technology

[0002] As a key component of automotive engines, oxygen sensors play a crucial role in controlling vehicle emissions. As a critical combustion state feedback unit in the electronic fuel injection engine control system, the oxygen sensor is a key component for controlling vehicle emissions, reducing environmental pollution, and improving fuel combustion quality. Oxygen sensors are all installed on the engine exhaust pipe and require high reliability; therefore, testing their performance is particularly critical.

[0003] Automotive oxygen sensors are functional components of car engines, and their operating environment is relatively harsh. Therefore, to ensure sensor quality, rapid qualification testing of the electrical performance of oxygen sensors is necessary before they leave the factory. However, the combustion chamber currently used does not achieve the same level of intake of fuel gas and air as a normal car engine, resulting in a significant difference from the actual exhaust gas flow rate. This makes it impossible to achieve rapid atmosphere switching and accurately assess the sensor's true performance. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a semi-enclosed combustion test chamber for an oxygen sensor combustion test bench. By using swirling flame technology, the combustion gas can be stably and rapidly combusted in the combustion area of ​​the combustion chamber to produce exhaust gas, thereby simulating the combustion function of a car engine and realizing high-flow-rate car exhaust gas. This enables the oxygen sensor combustion test bench to efficiently and accurately measure the electrical performance of the oxygen sensor.

[0005] To achieve the above objectives, the present invention provides a semi-enclosed combustion test chamber for an oxygen sensor combustion test bench, comprising a combustion chamber, a heat dissipation chamber, and a test chamber. One end of the combustion chamber is connected to one end of the heat dissipation chamber via a tapered connecting pipe, and the other end of the heat dissipation chamber is connected to the test chamber. The other end of the combustion chamber is provided with an air inlet.

[0006] The diameter of the combustion chamber is larger than the diameter of the heat dissipation chamber, and the diameter of the heat dissipation chamber is the same as the diameter of the test chamber;

[0007] The combustion chamber is provided with an air intake pipe, an ignition device and a swirl burner. The air intake port is connected to the air intake pipe, and the end of the air intake pipe away from the air intake port is provided with an ignition device. The swirl burner is fitted on the outer wall of the air intake pipe near the ignition device.

[0008] Specifically, the combustion chamber is equipped with a swirl flamer, which has a ring-shaped structure and forms a three-dimensional conical flame surface with a focal point in the circumferential direction. This concentrated flame reduces heat loss. When the flame is ejected, a rotating turbulent flame is also formed in the circumferential direction. The rotation speed of the rotating turbulent flame increases with the increase of the intake air velocity. Further concentrating through the conical connecting pipe, this results in more complete and stable combustion, improving the utilization rate of the fuel gas. The ignition device can be connected to an external insertion ignition device, i.e., an external igniter.

[0009] Specifically, the combustion chamber has an air inlet at the bottom to facilitate the entry of main combustion gas and air, and a computer-controlled igniter. The main combustion gas is primarily composed of propane or methane. Adjacent to the combustion chamber is a heat dissipation chamber, which is rapidly welded to it using electric welding. The combustion chamber consists of a conical connecting pipe and a hollow cylinder. The side closest to the heat dissipation chamber has a frustum structure, and the hollow conical frustum and the hollow cylinder are connected by a quick-connect flange. The conical structure allows for rapid simulation of airflow velocity.

[0010] Specifically, a temperature measuring device is provided at one end of the combustion chamber away from the air inlet, a heat dissipation chamber is provided with heat dissipation fins and a temperature measuring device, a testing chamber is provided with a heating and insulation device and a temperature measuring device, as well as a quick interface for oxygen sensor testing, and a large-diameter connecting plate is provided at the tail end of the testing chamber for connection with the exhaust gas recovery device.

[0011] Specifically, the test chamber is a cylindrical structure with multiple quick-test interfaces, simultaneously testing the electrical performance parameters of multiple oxygen sensors. A pre-built oxygen sensor or a chip-based oxygen sensor is mounted on the oxygen sensor pusher and connected to a control console. The console controls the pusher to perform the test and feeds the test results back to the console. Users can monitor the testing process and results in real time via the control console.

[0012] Furthermore, the heat dissipation cavity is provided with compensation vents and temperature measuring vents.

[0013] Specifically, the heat dissipation cavity is equipped with a thermocouple mounting port and a compensation vent for air intake. The thermocouple senses the temperature of the gas inside the cavity and transmits the sensed temperature to an external temperature transmitter. The compensation vent is used to allow or cut off fresh air, thereby rapidly changing the atmosphere inside the test cavity.

[0014] Furthermore, the test chamber is equipped with multiple fast test interfaces and thermocouple interfaces. The thermocouples sense the temperature of the gas inside the chamber and transmit the sensed temperature to an external temperature transmitter. A heating rod is installed outside the test chamber. The temperature of the test chamber is controlled by energizing the heating rod according to the temperature deviation. The multiple test interfaces test the performance parameters of different oxygen sensors.

[0015] Specifically, the test chamber is equipped with eight identical quick test interfaces. These eight quick test interfaces can simultaneously provide atmosphere for testing the electrical performance parameters of eight oxygen sensors. The parameters of each interface are sent to the control terminal of the oxygen sensor combustion test bench in real time.

[0016] Furthermore, a protective shell is fitted on the outside of the test chamber, and multiple support components are provided between the protective shell and the test chamber. One end of the test chamber is connected to the heat dissipation chamber, and the other end is open to the atmosphere, forming a semi-sealed structure for the entire combustion test chamber.

[0017] Furthermore, the bottom of the combustion chamber, the heat dissipation chamber, and the protective shell are provided with multiple support frames. One end of each support frame that supports the combustion chamber, the heat dissipation chamber, and the protective shell is semi-circular, and the other end of the support frame is fixed to the oxygen sensor combustion test bench.

[0018] Furthermore, the heat dissipation cavity is composed of an integrated heat sink, which is used to simulate atmospheric heat dissipation. The heat dissipation cavity measures the temperature by inserting thermocouples into multiple temperature measuring holes to determine whether to activate an external fan for air cooling.

[0019] Furthermore, an igniter is installed inside the combustion chamber. In the ignition area of ​​the combustion chamber, the automatic ignition function of the combustion test chamber can be realized through an external ignition device. The igniter is connected to the control module of the combustion test bench through an external circuit. The computer host of the combustion test bench simulates the exhaust gas atmosphere of the engine.

[0020] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0021] The combustion chamber of this invention features a swirl burner within its combustion zone. The swirl burner is a ring structure with an outer arc composed of multiple fan-shaped blades and an inner arc forming a threaded structure. Multiple circular air guide holes are arranged on the ring, with the holes angled inwards. The igniter is positioned adjacent to these circular air guide holes. The angled holes create a guiding curve when the main combustion gas and air enter the combustion zone, ensuring thorough mixing and stable combustion of the main components, thus facilitating the stable combustion of a large flow of gas. After complete combustion, the main combustion gas and air pass through a conical connecting pipe to further increase the flow rate before entering the heat dissipation chamber. The heat dissipation chamber is composed of integrated heat sinks and is designed to control the simulated exhaust gas temperature to drop to the target temperature. Compensation vents on the heat dissipation chamber allow for rapid adjustment of the simulated atmosphere concentration. This novel semi-enclosed combustion test chamber simulates the combustion of exhaust gas during normal operation of a car engine. It can achieve fully enclosed swirling combustion, with high flow rate and high velocity, while also enabling rapid switching of simulated atmosphere and temperature control, and can more accurately characterize the electrical performance of the sensor. Attached Figure Description

[0022] Figure 1 A schematic diagram of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in this embodiment of the invention. Figure 1 ;

[0023] Figure 2 A schematic diagram of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in this embodiment of the invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the heat dissipation cavity of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the air inlet pipe of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the conical connecting tube of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the support structure of the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the support frame for the semi-enclosed combustion test chamber of the oxygen sensor combustion test bench provided in an embodiment of the present invention;

[0030] The component names corresponding to the various labels in the figure are as follows: 1 is the combustion chamber, 101 is the air inlet, 102 is the air inlet pipe, 103 is the ignition device, 104 is the swirl burner, 2 is the heat dissipation chamber, 201 is the compensation vent, 202 is the temperature measuring hole, 3 is the test chamber, 301 is the test interface, 302 is the heating rod, 303 is the first sensor connection hole, 304 is the second sensor connection hole, 305 is the first temperature measuring hole, 306 is the second temperature measuring hole, 307 is the third temperature measuring hole, 308 is the exhaust port, 4 is the conical connecting pipe, 5 is the protective shell, 6 is the support component, 7 is the support frame, 701 is the first support frame, 702 is the second support frame, 703 is the third support frame, 704 is the fourth support frame, and 8 is the exhaust gas connecting ring. Detailed Implementation

[0031] This embodiment:

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] like Figure 1 and Figure 2 As shown, a semi-enclosed combustion test chamber of an oxygen sensor combustion test bench includes a combustion chamber 1, a heat dissipation chamber 2, and a test chamber 3. One end of the combustion chamber 1 is connected to one end of the heat dissipation chamber 2 through a tapered connecting pipe 4, and the other end of the heat dissipation chamber 2 is connected to the test chamber 3. The other end of the combustion chamber 1 is provided with an air inlet 101, and one end of the test chamber 3 is open to the atmosphere, forming a semi-enclosed structure.

[0034] The diameter of combustion chamber 1 is larger than the diameter of heat dissipation chamber 2, and the diameter of heat dissipation chamber 2 is the same as the diameter of test chamber 3.

[0035] The combustion chamber 1 is provided with an air inlet pipe 102, an ignition device 103 and a swirl burner 104. The air inlet 101 is connected to the air inlet pipe 102, and the end of the air inlet pipe 102 away from the air inlet 101 is provided with an ignition device 103. The swirl burner 104 is fitted on the outer wall of the air inlet pipe 102 near the ignition device 103.

[0036] See Figure 1 , Figure 5 and Figure 6 Specifically, the system comprises a combustion chamber 1, a heat dissipation chamber 2, and a testing chamber 3. The combustion chamber is a cylindrical structure with an air inlet 101 at one end for the main combustion gas and air to enter. The air inlet 101 connects to an air intake pipe 102, and an ignition device 103 is installed at the end of the air intake pipe 102 furthest from the air inlet 101. The ignition device 103 is computer-controlled. The main combustion gas consists primarily of propane, natural gas, or liquefied petroleum gas. The combustion chamber 1 and the heat dissipation chamber 2 are connected by a tapered connecting pipe 4, welded using electric welding. The heat dissipation chamber 2 has two holes, one for introducing compensating gas and the other for thermocouple temperature measurement. The other end of the heat dissipation chamber 2 is connected to the testing chamber 3 via a quick-connect flange. The testing chamber 3 is a cylindrical structure with multiple testing interfaces 301, each capable of connecting to an oxygen sensor and simultaneously providing a simulated atmosphere environment for the oxygen sensor. It is connected to a control console, allowing the console to control the test and provide feedback on the test results. Users can monitor the testing process and results in real time through the console.

[0037] Specifically, the combustion chamber 1 is equipped with a swirl flame generator 104, which forms a three-dimensional conical flame surface with a focal point in the circumferential direction. The flame is concentrated, which can reduce heat loss. When the flame is ejected, a rotating turbulent flame is also formed in the circumferential direction. The rotation speed of the rotating turbulent flame increases with the increase of the intake air velocity. After being gathered by the conical connecting pipe 4, the combustion is more complete and stable, which improves the utilization rate of the gas.

[0038] Specifically, a temperature measuring device is installed at the end of the intake pipe 102 away from the intake port 101. A heat sink and a temperature measuring device are installed on the heat dissipation chamber 2. The test chamber 3 is equipped with a heating, insulation, and temperature measuring device, as well as an interface for M18 rapid testing. A large-diameter connecting plate is also provided at the tail end of the test chamber 3 for connection to the exhaust gas recovery device, thus forming a semi-enclosed structure for the combustion test chamber. The combustion chamber 1 and the conical connecting pipe 4 are connected by a flange, the conical connecting pipe 4 and the heat dissipation chamber 2 are welded together, and the heat dissipation chamber 2 and the test chamber 3 are connected by a flange.

[0039] Specifically, the swirl burner 104 has a ring-shaped structure. The outer arc of the ring is composed of multiple fan blades, and the inner arc of the ring is a threaded structure. There are multiple circular air guide holes on the ring, and the structure of the circular air guide holes is an oblique circular hole from the outside to the inside. The ignition device 103 is located close to the outside of the circular air guide holes. The swirl burner 104 can ensure stable and complete combustion of high-velocity gas within a small area.

[0040] Stable combustion of fuel gas within the combustion chamber 1 and the generation of simulated exhaust gas are essential elements for oxygen sensor detection. The simple intake of fuel gas and air is far from achieving the exhaust gas flow rate of a car engine during normal operation. This application utilizes a combustion chamber design structure to enable stable and high-speed combustion of fuel gas inside, and achieves the functional requirement of simulating the high-flow-rate exhaust gas of a car engine through gas compensation switching and temperature control.

[0041] See Figure 3 The heat dissipation cavity 2 is provided with a compensation vent 201 and a temperature measuring vent 202.

[0042] Specifically, the heat dissipation cavity 2 has a thermocouple mounting port for placing thermocouples and a compensation vent 201 for air inlet. The thermocouple senses the temperature inside the cavity during combustion and transmits the sensed temperature to an external temperature transmitter. The compensation vent 201 allows fresh compensation air to be introduced or cut off, enabling rapid switching of the simulated exhaust gas atmosphere.

[0043] See Figure 2 and Figure 4 The test chamber 3 is equipped with multiple test interfaces 301, and a heating rod 302 is installed outside the test chamber. The multiple test interfaces 301 simultaneously test the performance parameters of multiple oxygen sensors. Figure 4As shown, the test chamber 3 is also equipped with a first sensor connection hole 303, a second sensor connection hole 304, a first temperature measuring hole 305, a second temperature measuring hole 306, and a third temperature measuring hole 307. The first sensor connection hole 303 and the second sensor connection hole 304 can connect to two standard sensors for comparison and verification with the measured oxygen sensor readings and for controlling the atmosphere within the test chamber. The second temperature measuring hole 306 is used for temperature measurement and control. The first temperature measuring hole 305 and the third temperature measuring hole 307 are used to monitor the temperature uniformity of the eight test holes. The test chamber 3 also has an exhaust port 308 at its rear end, which ultimately discharges the simulated exhaust gas into the air.

[0044] The test chamber has eight identical circular test ports 301, which can simultaneously provide a simulated atmosphere for testing eight oxygen sensors. A heating rod 302 is also placed outside the test chamber to control the temperature of the test gas.

[0045] See Figure 1 and Figure 7 The test chamber 3 is fitted with a protective shell 5 on its outer side, and multiple support members 6 are provided between the protective shell 5 and the test chamber 3.

[0046] The protective outer shell 5 can be used for heat preservation. Inside the protective outer shell 5, there can be four heating rods and asbestos, which is also used for heat preservation.

[0047] See Figure 1 and Figure 8 The combustion chamber 1, heat dissipation chamber 2, and protective shell 5 are equipped with multiple support frames 7 at their bottoms. These support frames 7 include a first support frame 701, a second support frame 702, a third support frame 703, and a fourth support frame 704. One end of each support frame 7 supporting the combustion chamber 1, heat dissipation chamber 2, and protective shell 5 is semi-circular, while the other end is fixed to an oxygen sensor combustion test bench. An exhaust gas connection ring 8 is also provided at the rear of the test chamber 3.

[0048] The heat dissipation cavity 2 is composed of an integrated heat sink, which is used for heat dissipation. The heat dissipation cavity 2 measures the temperature by inserting thermocouples into multiple temperature measuring holes 202.

[0049] The combustion chamber 1 is equipped with an igniter. In the ignition area of ​​the combustion chamber, the combustion test chamber can be automatically ignited by an external ignition device. The igniter is connected to the control module of the combustion test bench through an external circuit. The computer host of the combustion test bench simulates the exhaust gas atmosphere of the engine.

[0050] The combustion chamber of this invention features a swirl burner within its combustion zone. The swirl burner is a ring structure with an outer arc composed of multiple fan blades and an inner arc forming a threaded structure. Multiple circular air guide holes are provided on the ring, with the holes angled inwards. The igniter is positioned adjacent to these circular air guide holes. The angled holes create a guiding curve when the main combustion gas and air enter the combustion zone, ensuring thorough mixing and stable combustion. After complete combustion, the main combustion gas and air enter the cooling chamber through a conical connecting pipe, thus simulating the high-flow combustion state of a car engine and improving the utilization rate of the combustion gas.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A semi-enclosed combustion test chamber of an oxygen sensor combustion test bench, characterized in that, It includes a combustion chamber (1), a heat dissipation chamber (2) and a test chamber (3). One end of the combustion chamber (1) is connected to one end of the heat dissipation chamber (2) through a tapered connecting pipe (4), and the other end of the heat dissipation chamber (2) is connected to the test chamber (3). The other end of the combustion chamber (1) is provided with an air inlet (101). The diameter of the combustion chamber (1) is larger than the diameter of the heat dissipation chamber (2), and the diameter of the heat dissipation chamber (2) is the same as the diameter of the test chamber (3). The combustion chamber (1) is provided with an air inlet pipe (102), an ignition device (103) and a swirl burner (104). The air inlet (101) is connected to the air inlet pipe (102), and the end of the air inlet pipe (102) away from the air inlet (101) is provided with an ignition device (103). The swirl burner (104) is fitted on the outer wall of the air inlet pipe (102) near the ignition device (103). The igniter is a ring structure. The outer arc is composed of multiple fan blades, and the inner arc is a threaded structure. Multiple circular air guide holes are provided on the ring. The circular air guide hole structure is an oblique circular hole from the outside to the inside. The igniter is close to the circular air guide holes. The heat dissipation cavity (2) is provided with a compensation vent (201) and a temperature measuring vent (202); the simulated atmosphere inside the combustion test cavity can be quickly switched and changed through the compensation vent (201).

2. The semi-enclosed combustion test chamber of the oxygen sensor combustion test bench according to claim 1, characterized in that, The test chamber (3) is provided with multiple test interfaces (301), and a heating rod (302) is provided outside the test chamber. The multiple test interfaces (301) maintain the temperature of the test chamber and simultaneously test the electrical performance parameters of multiple oxygen sensors.

3. The semi-enclosed combustion test chamber of the oxygen sensor combustion test bench according to claim 2, characterized in that, The test chamber (3) is fitted with a protective shell (5) on its outer side, and a plurality of support members (6) are provided between the protective shell (5) and the test chamber (3).

4. The semi-enclosed combustion test chamber of the oxygen sensor combustion test bench according to claim 3, characterized in that, The bottom of the combustion chamber (1), the heat dissipation chamber (2) and the protective shell (5) are provided with multiple support frames (7). One end of the multiple support frames (7) supporting the combustion chamber (1), the heat dissipation chamber (2) and the protective shell (5) is semi-circular, and the other end of the support frame (7) is fixed on the oxygen sensor combustion test platform.

5. The semi-enclosed combustion test chamber of the oxygen sensor combustion test bench according to claim 4, characterized in that, The heat dissipation cavity (2) is composed of an integrated heat sink, which is used for heat dissipation. The heat dissipation cavity (2) measures temperature by inserting thermocouples into multiple temperature measuring holes (202).

6. The semi-enclosed combustion test chamber of the oxygen sensor combustion test bench according to claim 1, characterized in that, The combustion chamber (1) is equipped with an igniter. In the ignition area of ​​the combustion chamber, the combustion test chamber can be automatically ignited by an external ignition device. The igniter is connected to the combustion test bench control module through an external circuit. The engine exhaust atmosphere is simulated by the computer host of the combustion test bench.

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