Thermocouple type exhaust temperature sensor

Abstract

The utility model discloses a thermocouple type exhaust temperature sensor which comprises a control unit and a thermocouple probe, and the output end of the thermocouple probe is connected with the input end of the control unit. The control unit comprises an injection molding shell, a partition plate is arranged in the middle of the injection molding shell, a PCB used for analyzing and processing signals collected by the thermocouple probe is arranged below the partition plate, a connecting terminal used for being connected with the thermocouple probe is embedded in the partition plate, one end of the connecting terminal is connected with the thermocouple probe, and the other end of the connecting terminal is connected with the thermocouple probe. The other end of the connecting terminal penetrates through the partition plate and is connected with the PCB; the thermocouple probe is connected with the connecting terminal through a wire. The upper side and the lower side of the injection molding shell are each provided with a cover plate used for sealing. According to the utility model, a mode of integrating a plurality of parts through injection molding is adopted, so that the lead of the thermocouple probe is directly connected with the connecting terminal of the control unit, and the firmness of connection between the lead and the connecting terminal is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive sensors, and more particularly to a thermocouple exhaust gas temperature sensor. Background Art

[0002] During the operation of an automotive engine, monitoring the exhaust gas temperature is very important. As a common temperature sensor, the thermocouple is increasingly used as an automotive exhaust gas temperature sensor due to its simple structure, fast response speed, wide measurement range, etc. However, the control unit wire connection structure of existing thermocouple exhaust gas temperature sensors often has problems such as unstable connection, susceptibility to interference, and inconvenient installation. These problems may lead to inaccurate transmission of sensor signals and affect the control effect of the engine. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a thermocouple exhaust gas temperature sensor with a simple structure, convenient assembly, and high connection stability to solve the problems in the background art.

[0004] To solve the above technical problems, the technical solutions adopted by the utility model are as follows.

[0005] A thermocouple exhaust gas temperature sensor includes a control unit and a thermocouple probe. The output end of the thermocouple probe is connected to the input end of the control unit; the control unit includes an injection-molded housing. A partition is provided in the middle of the injection-molded housing. Below the partition, there is a PCB circuit board for analyzing and processing the signals collected by the thermocouple probe. Connection terminals for connecting the thermocouple probe are embedded in the partition. One end of the connection terminal is connected to the thermocouple probe, and the other end of the connection terminal passes through the partition and is connected to the PCB circuit board; the thermocouple probe is connected to the connection terminal through a wire; sealing covers are provided on both the upper and lower sides of the injection-molded housing.

[0006] Further optimizing the technical solution, the middle section of the connection terminal is injection-molded in the middle partition of the injection-molded housing. The two extended ends of the connection terminal are respectively connected to the wire of the thermocouple probe and the PCB circuit board. The end of the connection terminal connected to the wire has a double-forked structure, and the end of the connection terminal connected to the PCB circuit board has a fish-eye structure.

[0007] Further optimizing the technical solution, a chamfer for tightly wrapping the wire is provided on the inner side of the top of the double-forked structure.

[0008] Further optimizing the technical solution, an I-shaped fixing block is provided on the thermocouple probe, and an I-shaped groove matching the I-shaped structure on the fixing block is provided on the injection-molded housing.

[0009] Further optimize the technical solution, and sealant for fixing wires is filled in the I-shaped groove of the injection molded housing.

[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model is as follows.

[0011] A thermocouple type exhaust gas temperature sensor provided by the present utility model has a simple structure, is easy to assemble, and has a stable connection. By adopting the method of integrating multiple parts by injection molding, the wires of the thermocouple probe are directly connected to the connection terminals of the control unit, improving the firmness of the connection between the wires and the connection terminals and ensuring the stable electrical connection between the thermocouple wires and the PCB circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a schematic connection diagram of the wires and the control unit of the present utility model;

[0014] Figure 3 is a schematic cross-sectional view of the connection structure of the control unit of the present utility model;

[0015] Figure 4 is a schematic structural diagram of the connection terminal of the present utility model;

[0016] Figure 5 is a schematic connection diagram of the link terminal and the wire of the present utility model.

[0017] Wherein: 1. Control unit, 2. Thermocouple probe, 3. Injection molded housing, 4. PCB circuit board, 5. Connection terminal, 6. Wire, 7. Fixed block, 8. Partition board, 9. Double fork-shaped structure, 10. Fish-eye structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] A thermocouple type exhaust gas temperature sensor, as shown in combination with Figures 1 to 5 includes a control unit 1 and a thermocouple probe 2, and the output end of the thermocouple probe 2 is connected to the input end of the control unit.

[0020] The control unit 1 includes an injection molded housing 3 and a PCB circuit board 4. A partition board 8 is arranged in the middle of the injection molded housing 3, and the PCB circuit board 4 is arranged below the partition board 8 to analyze and process the signals collected by the thermocouple probe 2. A connection terminal 5 is arranged above the partition board 8 to connect the thermocouple probe 2. One end of the connection terminal 5 is connected to the thermocouple probe 2, and the other end of the connection terminal 5 passes through the partition board 8 and is connected to the PCB circuit board 4.

[0021] The thermocouple probe 2 is connected to the connection terminal 5 through the wire 6. The middle section of the connection terminal 5 is injection-molded within the middle partition 8 of the injection-molded housing 3. The two extended ends of the connection terminal 5 are respectively connected to the wire 6 of the thermocouple probe 2 and the PCB circuit board 4. One end of the connection terminal 5 connected to the wire 6 has a double-fork structure 9 for clamping the copper wire of the wire 6, and one end of the connection terminal 5 connected to the PCB circuit board 4 has a fish-eye structure 10 for engaging with the conductive through-hole of the PCB circuit board.

[0022] The opening width at one end of the double-fork structure 9 is 0.8 mm, and a 0.5-square copper wire can be inserted. Chamfers are provided on the inner side near the top of the double fork, which can strip the insulating outer skin of the wire 6 to expose the copper wire when the wire 6 is pressed in. After inwardly clamping the double fork, the copper wire can be tightly wrapped. After potting the wire connection, a stable connection and conduction can be maintained.

[0023] After the copper wire of the wire 6 is clamped by the double-fork end of the connection terminal 5, resistance welding is applied to the double fork to melt the copper wire and the double fork into one body, which can further improve the conduction stability. In addition to resistance welding, solder can also be used to weld the copper wire and the double fork into one body.

[0024] An I-shaped fixing block 7 is provided on the thermocouple probe 2, and an I-shaped groove matching the I-shaped structure on the fixing block 7 is provided on the injection-molded housing 3. Sealant is filled in the I-shaped groove of the injection-molded housing 3 to fix the wire, making the connection between the thermocouple probe and the control unit stable and sealed, and making the connection between the wire and the connection terminal more stable and reliable.

[0025] Cover plates are provided on both the upper and lower sides of the injection-molded housing 3 to achieve the sealing of the control unit.

[0026] The utility model integrates multiple parts by injection molding, enabling the wire of the thermocouple probe to be directly connected to the connection terminal of the control unit. The wire and the connection terminal adopt a connection method of pressing and tightening, and are potted and sealed, improving the firmness of the connection between the wire and the connection terminal, and ensuring the stable electrical connection between the thermocouple wire and the PCB circuit board.

Claims

1. A thermocouple type exhaust gas temperature sensor, comprising a control unit (1) and a thermocouple probe (2), the output end of the thermocouple probe (2) is connected to the input end of the control unit (1); characterized in that: The control unit (1) includes an injection-molded housing (3). A partition plate (8) is arranged in the middle of the injection-molded housing (3). Below the partition plate (8), there is a PCB circuit board (4) for analyzing and processing the signals collected by the thermocouple probe (2). Connection terminals (5) for connecting the thermocouple probe (2) are embedded in the upper part of the partition plate (8). One end of the connection terminal (5) is connected to the thermocouple probe (2), and the other end of the connection terminal (5) passes through the partition plate (8) and is connected to the PCB circuit board (4); the thermocouple probe (2) is connected to the connection terminal (5) through a wire (6); cover plates for sealing are arranged on both the upper and lower sides of the injection-molded housing (3).

2. The thermocouple type exhaust gas temperature sensor according to claim 1, wherein: The middle section of the connection terminal (5) is injection-molded in the middle partition plate (8) of the injection-molded housing (3). The two extended ends of the connection terminal (5) are respectively connected to the wire (6) of the thermocouple probe (2) and the PCB circuit board (4). The end of the connection terminal (5) connected to the wire (6) has a double-fork structure (9), and the end of the connection terminal (5) connected to the PCB circuit board (4) has a fish-eye structure (10).

3. The thermocouple type exhaust gas temperature sensor according to claim 2, wherein: A chamfer for tightly wrapping the wire is arranged on the inner side of the top of the double-fork structure (9).

4. The thermocouple type exhaust gas temperature sensor according to claim 1, characterized in that: An I-shaped fixing block (7) is arranged on the thermocouple probe (2), and an I-shaped groove matching the I-shaped structure on the fixing block (7) is arranged on the injection-molded housing (3).

5. A thermocouple type exhaust gas temperature sensor according to claim 3, characterized in that: Sealing glue for fixing the wire is filled in the I-shaped groove of the injection-molded housing (3).

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