Sensor shell with novel soot prevention structure and Tesla valve

Abstract

The invention relates to a sensor shell with a novel soot prevention structure and a Tesla valve, the sensor shell comprises a sensor shell body, in the application process of an air inlet pressure and temperature sensor, a pressure chip needs to be in direct contact with air in an air inlet manifold, and the Tesla valve is additionally arranged at an air inlet hole; the Tesla valve is a passive one-way conducting valve in a fixed geometrical shape and can enable fluid to circulate in a one-way mode, because gas can only enter a working gas cavity of a product from a gas inlet hole end, when the product works, when soot particles which should be directly rushed into the working gas cavity originally pass through the Tesla valve, flow resistance is increased, energy loss in the movement process of the soot particles is increased, and energy loss is reduced. When the air pressure in the working air cavity is larger than the outside air pressure, residual soot particles pass through the Tesla valve along with the air flow and fall back into the air inlet manifold in an accelerated mode, the soot content in the working air cavity is obviously reduced, the influence of soot on a chip is reduced, and the service life of the product is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of intake pressure temperature sensor equipment, in particular to a sensor housing with a novel anti-carbon smoke structure having a Tesla valve. Background Art

[0002] The function of the intake pressure and temperature sensor is to monitor the pressure and temperature of the gas entering the intake manifold and transmit the monitoring data to the engine ECU system.

[0003] During the operation of the existing intake pressure and temperature sensor, soot and other impurities directly enter the working air cavity of the pressure chip along with the working air flow. When the engine is working for a long time, the soot and other impurities cannot be discharged from the working air cavity, and they continue to accumulate and eventually adhere to the protective gel at the pressure sensing hole of the pressure chip. As time accumulates, the carbon particles and impurities on the gel continue to increase, eventually blocking the intake hole, making the pressure chip unable to correctly sense the intake manifold pressure, which in turn causes the vehicle engine system to work abnormally, the ECU system alarms, and affects the normal use of the vehicle.

[0004] For example, an authorized patent document with application number CN202210434250.0 discloses a vehicle intake pressure and temperature sensor, which includes a terminal sub-assembly and a chip circuit board sub-assembly. The terminal sub-assembly is provided with a accommodating cavity and a gas channel that are connected to each other. The chip circuit board sub-assembly is welded in the accommodating cavity of the terminal sub-assembly. A pressure chip is provided on the upper surface of the chip circuit board sub-assembly. A pressure sensing hole is provided on the terminal sub-assembly for gas to enter, and the pressure sensing hole is connected to the gas channel.

[0005] The above patent states that during the application of the intake pressure temperature sensor, the pressure chip needs to be in direct contact with the gas in the intake manifold.

[0006] Since the oil-gas separator cannot completely separate all the oil vapor, the oil vapor in the crankcase will be introduced into the intake manifold through the exhaust pipe. After working for a long time, the engine oil, incompletely burned gasoline, dust, debris, etc. will mix to form carbon deposits that are deposited in the intake manifold. During the operation of the intake manifold, the fine particles on the surface of the carbon deposits will directly enter the working air cavity of the intake pressure sensor with the airflow and deposit on the chip gel. When the chip gel is seriously carbonized, it will affect the output accuracy of the product performance and cause product defects. Therefore, we need to provide a sensor housing with a new anti-carbon smoke structure with a Tesla valve. Summary of the invention

[0007] The purpose of the present invention is to provide a sensor housing with a novel anti-carbon smoke structure of a Tesla valve. The Tesla valve anti-carbon smoke mechanism is installed at the air intake end of the sensor housing body. Through the one-way valve property of the Tesla valve, the product performance output is not affected, and the corrosion of carbon smoke to the chip is reduced, thereby improving the service life. Under the condition of meeting normal pressure sensing, the air intake structure equipped with the Tesla valve anti-carbon smoke mechanism adds a carbon smoke particle blocking structure to reduce the carbon smoke particles or other impurities entering the working air cavity and reduce the damage to the chip. The problem proposed in the above background technology that the oil-gas separator cannot completely separate all the engine oil vapor, the engine oil vapor of the crankcase will be introduced into the intake manifold through the exhaust pipe after working for a long time, and the engine oil, incompletely burned gasoline, dust, debris, etc. will mix to form carbon deposits and be deposited in the intake manifold to form carbon deposits. During the operation of the intake manifold, fine particles on the surface of the carbon deposits will directly enter the working air cavity of the intake pressure sensor with the airflow and be deposited on the chip gel. When the carbon deposition of the chip gel is serious, it will affect the accuracy of the product performance output and cause product defects.

[0008] To achieve the above object, the present invention provides the following technical solution: a sensor housing with a novel anti-smoke structure having a Tesla valve, comprising:

[0009] Sensor housing body;

[0010] The bottom of the sensor housing body is provided with a housing assembly air inlet end;

[0011] A Tesla valve anti-carbon smoke mechanism is provided at the top of the air inlet end of the shell assembly for reducing the content of carbon smoke particles directly rushing into the working air cavity and extending the service life of the chip. The Tesla valve anti-carbon smoke mechanism includes a Tesla valve installed at the air inlet end of the shell assembly.

[0012] Preferably, a PCB board is installed inside the sensor housing body, a pressure-sensitive chip is installed on the top of the PCB board, an air chamber is connected to the top of the air inlet end of the shell assembly, the air chamber is opened inside the sensor housing body, and the air chamber is connected to the pressure-sensitive chip, and the Tesla valve anti-carbon smoke mechanism is installed in the air chamber.

[0013] Preferably, the Tesla valve anti-carbon smoke mechanism includes a rectangular seat installed in the air chamber, and the four side surfaces of the rectangular seat are embedded with Tesla valve modules, the bottoms of the four Tesla valve modules are connected to the lower air groove, and the tops of the four Tesla valve modules are connected to the upper air groove.

[0014] Preferably, a connecting seat is integrally processed on the top of the Tesla valve module, and connecting grooves are provided at the four corners of the connecting surface, and the four connecting grooves are respectively connected to the four upper air grooves.

[0015] Preferably, the gas in the four Tesla valve modules flows unimpeded from the upper end to the lower end, and the bottom of the Tesla valve module is configured to be inclined.

[0016] Preferably, the rectangular seat surface is tightly fitted with the middle inner wall of the air chamber, and one side of the Tesla valve module is tightly fitted with the middle inner wall of the air chamber.

[0017] Preferably, a pressure cover is installed on the top of the sensor housing body, a resistor is arranged inside the air inlet end of the housing assembly, and a plug assembly is installed on one side of the sensor housing body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The Tesla valve anti-carbon smoke mechanism of the present invention is installed at the air inlet end of the sensor housing body. Through the one-way valve property of the Tesla valve, the product performance output is not affected, and the corrosion of the chip by carbon smoke is reduced, thereby improving the service life. When normal pressure sensing is met, the air inlet structure equipped with the Tesla valve anti-carbon smoke mechanism adds a carbon smoke particle blocking structure, reduces the carbon smoke particles or other impurities entering the working air cavity, and reduces the damage to the chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a formal cross-sectional view of the structure of the present invention;

[0021] Figure 2 The structure of the present invention Figure 1 A partial enlarged schematic diagram in the middle;

[0022] Figure 3 It is a stereoscopic diagram of the Tesla valve anti-carbon smoke mechanism of the present invention.

[0023] In the figure: 1. Sensor housing body; 2. Inlet end; 3. Tesla valve anti-carbon smoke mechanism; 31. Rectangular seat; 32. Tesla valve module; 33. Lower air groove; 34. Upper air groove; 4. PCB board; 5. Pressure sensing chip; 6. Air chamber; 7. Connecting seat; 8. Connecting groove; 9. Pressure cover; 10. Resistor; 11. Insert assembly. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-3The present invention provides a technical solution: a sensor housing with a novel anti-smoke structure having a Tesla valve, comprising:

[0026] Sensor housing body 1;

[0027] The bottom of the sensor housing body 1 is provided with a housing assembly air inlet end 2;

[0028] The top of the air inlet end 2 of the housing assembly is provided with a Tesla valve anti-carbon smoke mechanism 3 for reducing the content of carbon smoke particles directly rushing into the working air cavity and extending the service life of the chip. The Tesla valve anti-carbon smoke mechanism 3 includes a Tesla valve installed at the air inlet end 2 of the housing assembly;

[0029] Specifically, the Tesla valve anti-carbon smoke mechanism 3 is installed at the air inlet end 2 inside the sensor housing body 1. Through the one-way valve property of the Tesla valve, without affecting the product performance output, it neither increases the product production process nor reduces the corrosion of the chip by carbon smoke, thereby improving the service life. When normal pressure sensing is met, the air intake structure equipped with the Tesla valve anti-carbon smoke mechanism 3 adds a carbon smoke particle blocking structure, reduces the carbon smoke particles or other impurities entering the working air cavity, and reduces damage to the chip.

[0030] A PCB board 4 is installed inside the sensor housing body 1, a pressure-sensing chip 5 is installed on the top of the PCB board 4, an air chamber 6 is connected to the top of the air inlet end 2 of the housing assembly, the air chamber 6 is opened inside the sensor housing body 1, and the air chamber 6 is connected to the pressure-sensing chip 5, and the Tesla valve anti-carbon smoke mechanism 3 is installed at the air chamber 6;

[0031] In this embodiment, during the application of the intake pressure and temperature sensor, the pressure chip needs to be in direct contact with the gas in the intake manifold, and a Tesla valve is added at the intake hole. The Tesla valve is a passive one-way guide valve with a fixed geometry that allows the fluid to flow in one direction.

[0032] Since the gas can only enter the working air cavity of the product from the air inlet end, when the product is working, the soot particles that should have directly rushed into the working air cavity will have increased flow resistance when passing through the Tesla valve, and the energy loss of the soot particles during movement will increase. There is not enough energy to enter the working air cavity and they stay in the Tesla valve.

[0033] When the air pressure in the working air chamber is greater than the external air pressure, the remaining soot particles are accelerated along with the airflow through the Tesla valve and fall back into the intake manifold, which significantly reduces the soot content in the working air chamber, reduces the impact of soot on the chip, improves product accuracy, and extends the service life of the product.

[0034] The Tesla valve anti-carbon smoke mechanism 3 includes a rectangular seat 31 installed in the air chamber 6, and the four side surfaces of the rectangular seat 31 are embedded with Tesla valve modules 32, the bottoms of the four Tesla valve modules 32 are connected to the lower gas groove 33, and the tops of the four Tesla valve modules 32 are connected to the upper gas groove 34;

[0035] Furthermore, the gas first enters the lower gas groove 33 through the intake end 2 and flows into the Tesla valve module 32, and is discharged from the upper gas groove 34. This process is reverse entry into the Tesla valve module 32. When the intake manifold is working, the soot particles enter the working air cavity and enter the Tesla valve in the reverse direction with the gas. Due to the increased resistance, the soot particles cannot enter the working air cavity, thereby avoiding the deposition of soot particles on the chip gel, affecting product performance, and extending product life. When the air pressure in the working air cavity is greater than the external air pressure, the soot particles enter the Tesla valve in the forward direction with the gas, and accelerate back into the intake manifold, reducing the impact of the soot on the chip.

[0036] The top of the Tesla valve module 32 is integrally processed with a connection seat 7, and the four corners of the connection surface are provided with connecting grooves 8, and the four connecting grooves 8 are respectively connected to the four upper gas grooves 34;

[0037] It should be noted that the anti-carbon smoke housing uses a Tesla valve, which adopts a unique circuit design: when the fluid passes through the Tesla valve in the forward direction, the fluid will be split into two streams at each loop port, and then the two streams will reunite at the next intersection, thereby achieving an acceleration effect. However, when the fluid flows into the Tesla valve in the reverse direction, although the fluid will also be split at the first intersection and reunite at the second intersection, the flow directions of the two streams are opposite at this time, so huge resistance will be generated, so that the Tesla valve can only pass forward and it is difficult to reverse the flow. The Tesla valve module 32 fits tightly with the inside of the air chamber 6, and the groove between the Tesla valve module 32 and the inner wall of the air chamber 6 is the Tesla valve.

[0038] The gas in the four Tesla valve modules 32 flows unimpeded from the upper end to the lower end, and the bottom of the Tesla valve module 32 is set to be inclined;

[0039] It is worth noting that the gas in the Tesla valve module 32 flows unimpeded from the upper end to the lower end. Since the gas can only enter the working air cavity of the product from the air inlet end, when the product is working, the soot particles that should have directly rushed into the working air cavity will increase in flow resistance when passing through the Tesla valve. The energy loss of the soot particles during movement increases, and there is not enough energy to enter the working air cavity, so they stay in the Tesla valve.

[0040] The surface of the rectangular seat 31 is tightly fitted with the inner wall of the middle part of the air chamber 6, and one side of the Tesla valve module 32 is tightly fitted with the inner wall of the middle part of the air chamber 6;

[0041] Specifically, the surface of the rectangular seat 31 fits tightly against the inner wall of the middle portion of the air chamber 6, thereby preventing the Tesla valve groove on one side of the Tesla valve module 32 from fitting against the inner wall of the air chamber 6, thereby preventing a complete Tesla valve from being formed.

[0042] A gland 9 is installed on the top of the sensor housing body 1, a resistor 10 is arranged inside the air inlet end 2 of the housing assembly, and a plug assembly 11 is installed on one side of the sensor housing body 1;

[0043] Among them, the intake pressure and temperature sensor is an integrated component, usually installed on the intake manifold of the car, used to monitor the pressure and temperature of the intake manifold. The intake pressure sensing element consists of a silicon chip with a thickness of only a few microns. A pressure diaphragm containing four piezoresistors 10 is etched on the silicon chip. These four piezoresistors 10 form a Wheatstone bridge. One side of the silicon chip is a closed reference space close to vacuum, and the back side is subjected to the intake manifold absolute pressure introduced through the pipe. The intake manifold absolute pressure causes the silicon chip and the piezoresistors 10 to undergo mechanical deformation, causing their resistance to change and the Wheatstone bridge to lose balance. After being processed by the circuit on the silicon chip, a voltage signal output that is linear with the pressure is formed. The intake pressure and temperature sensor converts the measured pressure and temperature signals into voltage signals and outputs them to the ECU (engine control unit). The ECU calculates the intake air density and mass based on these signals and parameters such as the engine speed, thereby correcting the injection amount and ignition timing angle to ensure the normal operation of the engine.

[0044] During the application of the intake pressure and temperature sensor of this device, the pressure chip needs to be in direct contact with the gas in the intake manifold, and a Tesla valve is added at the intake hole. The Tesla valve is a passive one-way guide valve with a fixed geometry that allows the fluid to flow in one direction.

[0045] Since the gas can only enter the working air cavity of the product from the air inlet end, when the product is working, the soot particles that should have directly rushed into the working air cavity will have increased flow resistance when passing through the Tesla valve, and the energy loss of the soot particles during movement will increase. There is not enough energy to enter the working air cavity and they stay in the Tesla valve.

[0046] When the air pressure in the working air chamber is greater than the external air pressure, the remaining soot particles are accelerated along with the airflow through the Tesla valve and fall back into the intake manifold, which significantly reduces the soot content in the working air chamber, reduces the impact of soot on the chip, improves product accuracy, and extends the service life of the product.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sensor housing with a novel anti-smoke structure having a Tesla valve, characterized in that: include: Sensor housing body (1); The bottom of the sensor housing body (1) is provided with a housing assembly air inlet end (2); A Tesla valve anti-carbon smoke mechanism (3) is provided at the top of the air inlet end (2) of the housing assembly for reducing the content of carbon smoke particles that directly rush into the working air cavity and extending the service life of the chip. The Tesla valve anti-carbon smoke mechanism (3) includes a Tesla valve installed at the air inlet end (2) of the housing assembly.

2. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 1, characterized in that: A PCB board (4) is installed inside the sensor housing body (1), a pressure sensing chip (5) is installed on the top of the PCB board (4), an air chamber (6) is connected to the top of the air inlet end (2) of the housing assembly, the air chamber (6) is opened inside the sensor housing body (1), and the air chamber (6) is connected to the pressure sensing chip (5), and the Tesla valve anti-carbon smoke mechanism (3) is installed in the air chamber (6).

3. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 2, characterized in that: The Tesla valve anti-carbon smoke mechanism (3) comprises a rectangular seat (31) installed in the air chamber (6), the four side surfaces of the rectangular seat (31) are embedded with Tesla valve modules (32), the bottoms of the four Tesla valve modules (32) are connected to lower air grooves (33), and the tops of the four Tesla valve modules (32) are connected to upper air grooves (34).

4. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 3 is characterized in that: The top of the Tesla valve module (32) is integrally processed with a connection seat (7), and the four corners of the connection surface are provided with connecting grooves (8), and the four connecting grooves (8) are respectively connected to the four upper air grooves (34).

5. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 4, characterized in that: The gas in the four Tesla valve modules (32) flows unimpeded from the upper end to the lower end, and the bottom of the Tesla valve module (32) is arranged to be inclined.

6. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 5, characterized in that: The surface of the rectangular seat (31) is tightly fitted with the inner wall of the middle part of the air chamber (6), and one side of the Tesla valve module (32) is tightly fitted with the inner wall of the middle part of the air chamber (6).

7. The sensor housing with a novel anti-smoke structure having a Tesla valve according to claim 1, characterized in that: A pressure cover (9) is installed on the top of the sensor housing body (1), a resistor (10) is arranged inside the air inlet end (2) of the housing assembly, and a plug assembly (11) is installed on one side of the sensor housing body (1).

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