A differential pressure sensor for a vehicle

Abstract

The utility model discloses a kind of automobile differential pressure sensors, belong to pressure sensor technical field.A kind of automobile differential pressure sensor, including shell and connector and detection head connected on shell, the shell is provided with first chamber and second chamber with detection head intercommunication, further include: ceramic plate, install in second chamber, pressure-sensitive chip is installed on ceramic plate, two working ends of pressure-sensitive chip are respectively communicated with first chamber and second chamber;PIN needle, install in connector, another end of PIN needle extends to second chamber, and is connected with ceramic plate by binding wire;First cover plate and second cover plate are respectively embedded on first chamber and second chamber, and sealing structure is arranged in junction portion;The utility model improves the service life of component and the conduction accuracy by using ceramic plate and binding wire process, and cooperate with multiple colloids, to ensure the airtightness of chamber.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to an automotive differential pressure sensor. Background Technology

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Pressure sensors are one of the most commonly used sensors in industrial practice, and they are widely used in various industrial automation environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, power, shipbuilding, machine tools, and pipelines. Pressure sensors are also used in automobile exhaust treatment, where the capture of particulate matter in automobile exhaust needs to be monitored.

[0003] In the prior art, nitrogen oxides and particulate matter output by vehicle engines, such as nitrogen oxides forming acidic solutions when they come into contact with water vapor, can easily corrode the sensor chip and circuitry. Furthermore, the sealing performance of the chamber needs to be effectively guaranteed during assembly and subsequent use. Therefore, an automotive differential pressure sensor is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low chamber sealing performance and easy contamination of circuit components by gas and liquid in the chamber in the existing technology, and to propose an automotive differential pressure sensor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A differential pressure sensor for automobiles includes a housing, a connector and a detection head connected to the housing, wherein the housing has a first chamber and a second chamber communicating with the detection head, and further includes: a ceramic plate installed in the second chamber, wherein a pressure-sensing chip is installed on the ceramic plate, and the two working ends of the pressure-sensing chip are respectively connected to the first chamber and the second chamber; a PIN pin installed in the connector, the other end of the PIN pin extending into the second chamber and connected to the ceramic plate by a binding wire; a first cover plate and a second cover plate respectively embedded in the first chamber and the second chamber, and a sealing structure is provided at the joint.

[0007] To ensure effective detection on both sides of the sensor, preferably, the first chamber and the second chamber are connected by a slot, the ceramic plate covers the slot, and one of the working ends of the pressure-sensitive chip faces the slot.

[0008] To further enhance the isolation effect of the dual chambers, a third sealing colloid is provided between the ceramic plate and the second chamber. The third sealing colloid surrounds the groove and is used to isolate the first chamber from the second chamber.

[0009] To facilitate the filling and positioning of the sealing colloid, preferably, the sealing structure includes a first sealing colloid and a second sealing colloid, and both the first cover plate and the second chamber are provided with receiving cavities, with the first sealing colloid and the second sealing colloid disposed within the receiving cavities.

[0010] To effectively fix the ceramic plate, preferably, a rivet is fixedly connected in the second cavity, and a rivet hole is opened on the ceramic plate, through which the rivet passes.

[0011] Preferably, a conditioning chip is mounted on the ceramic plate.

[0012] Preferably, the first chamber and the second chamber are arranged opposite to each other.

[0013] Furthermore, the detection head is provided in two sets, one set is connected to the first chamber, and the other set is connected to the second chamber through a flow channel.

[0014] To enhance the protection of electronic components, the binding wire preferably includes an aluminum wire and a binding tape, with the two ends of the aluminum wire connected to the pin and the terminal of the ceramic plate, respectively, and the binding tape spirally wound around the outer surface of the aluminum wire.

[0015] Preferably, it also includes a cylindrical bushing, wherein the housing is provided with a connection hole, and the bushing is installed in the connection hole.

[0016] Compared with the prior art, this utility model provides an automotive differential pressure sensor, which has the following advantages:

[0017] The parts not mentioned in this device are the same as or can be implemented using existing technology. This utility model improves the service life of the components and the transmission accuracy by using ceramic plates and wire binding processes, and uses multiple colloids to ensure the airtightness of the chamber. Attached Figure Description

[0018] Figure 1 This is a perspective view of an automotive differential pressure sensor proposed in this utility model;

[0019] Figure 2 This is a plan view of an automotive differential pressure sensor proposed in this utility model;

[0020] Figure 3 This is an unfolded view of an automotive differential pressure sensor proposed in this utility model;

[0021] Figure 4 This utility model proposes an automotive differential pressure sensor. Figure 3 A schematic diagram of the structure of part A;

[0022] Figure 5 This is a partial structural diagram of an automotive differential pressure sensor proposed in this utility model. Figure 1 ;

[0023] Figure 6 This is a partial structural diagram of an automotive differential pressure sensor proposed in this utility model. Figure 2 .

[0024] In the diagram: 100, housing; 101, first chamber; 102, second chamber; 103, rivet; 104, slot; 105, receiving cavity; 106, detection head; 107, bushing; 200, connector; 201, PIN pin; 202, binding wire; 300, ceramic plate; 301, conditioning chip; 302, pressure-sensitive chip; 400, second cover plate; 401, second sealing colloid; 402, third sealing colloid; 500, first cover plate; 501, first sealing colloid. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example:

[0028] Reference Figures 1-6A differential pressure sensor for automobiles includes a housing 100 made of BASF B4330 G6 HR engineering plastic, a connector 200 connected to the housing 100, and a detection head 106. A connection hole is formed at one end of the connector 200, and a bushing 107 is embedded in the connection hole. The housing 100 has a first chamber 101 and a second chamber 102 communicating with the detection head 106. The first chamber 101 and the second chamber 102 are arranged opposite to each other. There are two detection heads 106, one for low pressure and one for high pressure, which are independently connected to the first chamber 101 and the second chamber 102. A ceramic plate 300 is installed in the second chamber 102, and a pressure module is installed on the ceramic plate 300, one of which is a sensing module. The pressure-sensing chip 302 has two working ends that are respectively connected to the first chamber 101 and the second chamber 102 to collect the pressure of the two chambers. A PIN pin 201 is installed in the connector 200, and the other end of the PIN pin 201 extends into the second chamber 102 and is connected to the ceramic plate 300 through the binding wire 202 to isolate moisture. Before assembly, the open ends of the first chamber 101 and the second chamber 102 used for installing components are respectively embedded in the first cover plate 500 and the second cover plate 400, and a sealing structure is provided at the embedded joint to seal the entire interior of the automotive differential pressure sensor and ensure the accuracy of pressure detection.

[0029] The first chamber 101 and the second chamber 102 are connected by a slot 104. A ceramic plate 300 covers the slot 104 to seal the slot 104 and isolate the two chambers. One working end of the pressure-sensitive chip 302 is facing the slot 104 and is located in the space of the first chamber 101, while the other working end is directly located in the second chamber 102, thereby realizing detection.

[0030] A third sealing colloid 402 is provided between the ceramic plate 300 and the second chamber 102. The third sealing colloid 402 surrounds the groove 104 and is used to isolate the first chamber 101 and the second chamber 102, thereby improving the sealing and isolation effect after the ceramic plate 300 is installed and improving the accuracy of the test.

[0031] In addition, the sealing structure includes a first sealing colloid 501 and a second sealing colloid 401. Both the first cover plate 500 and the second chamber 102 are provided with receiving cavities 105. The first sealing colloid 501 and the second sealing colloid 401 are disposed in the receiving cavities 105, so that after the two cover plates are embedded in the two chambers, the sealing effect of the two chambers can be guaranteed. The colloid is preferably Corning 1598 sealant.

[0032] A rivet 103 is fixedly connected in the second chamber 102. A riveting hole is opened on the ceramic plate 300. The rivet 103 passes through the riveting hole and the ceramic plate 300 is fixed in the second chamber 102 by hot riveting.

[0033] A conditioning chip 301 is installed on the ceramic plate 300. This chip uses Elmos' E520.47.

[0034] The specific binding wire 202 includes an aluminum wire and a binding tape. The two ends of the aluminum wire are connected to the pin 201 and the terminal of the ceramic plate 300, respectively. The binding tape is spirally wrapped around the outer surface of the aluminum wire to cover the aluminum wire, prevent it from contacting moisture, and improve its service life.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A differential pressure sensor for automobiles, comprising a housing (100) and a connector (200) and a detection head (106) connected to the housing (100), wherein the housing (100) is provided with a first chamber (101) and a second chamber (102) communicating with the detection head (106), characterized in that, Also includes: A ceramic plate (300) is installed in the second chamber (102). The ceramic plate (300) is equipped with a pressure-sensitive chip (302), and the two working ends of the pressure-sensitive chip (302) are respectively connected to the first chamber (101) and the second chamber (102); A PIN pin (201) is installed inside the connector (200), and the other end of the PIN pin (201) extends into the second chamber (102) and is connected to the ceramic plate (300) by a binding wire (202); The first cover plate (500) and the second cover plate (400) are respectively embedded in the first chamber (101) and the second chamber (102), and a sealing structure is provided at the joint.

2. The automotive differential pressure sensor according to claim 1, characterized in that, The first chamber (101) and the second chamber (102) are connected by a slot (104), and the ceramic plate (300) covers the slot (104). One of the working ends of the pressure-sensitive chip (302) is facing the slot (104).

3. The automotive differential pressure sensor according to claim 2, characterized in that, A third sealing colloid (402) is provided between the ceramic plate (300) and the second chamber (102). The third sealing colloid (402) surrounds the groove (104) and is used to isolate the first chamber (101) and the second chamber (102).

4. The automotive differential pressure sensor according to claim 1, characterized in that, The sealing structure includes a first sealing colloid (501) and a second sealing colloid (401). The first cover plate (500) and the second chamber (102) are both provided with receiving cavities (105). The first sealing colloid (501) and the second sealing colloid (401) are disposed in the receiving cavities (105).

5. The automotive differential pressure sensor according to claim 1, characterized in that, A rivet (103) is fixedly connected inside the second chamber (102), and a riveting hole is provided on the ceramic plate (300), through which the rivet (103) passes.

6. The automotive differential pressure sensor according to claim 1, characterized in that, A conditioning chip (301) is mounted on the ceramic plate (300).

7. The automotive differential pressure sensor according to claim 1, characterized in that, The first chamber (101) and the second chamber (102) are arranged opposite each other.

8. A differential pressure sensor for automobiles according to claim 1 or 7, characterized in that, The detection head (106) is provided in two sets, one set is connected to the first chamber (101), and the other set is connected to the second chamber (102) through the flow channel.

9. A differential pressure sensor for automobiles according to claim 1, characterized in that, The binding wire (202) includes an aluminum wire and a binding tape. The two ends of the aluminum wire are connected to the terminals of the PIN pin (201) and the ceramic plate (300) respectively, and the binding tape is spirally wound around the outer surface of the aluminum wire.

10. A differential pressure sensor for automobiles according to claim 1, characterized in that, It also includes a cylindrical bushing (107), on which the housing (100) is provided a connection hole, and the bushing (107) is installed in the connection hole.

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