CN211576889U - Automobile air conditioner filter screen blockage detection device - Google Patents

Abstract

The utility model provides a vehicle air conditioner filter screen blocks up detection device belongs to the air conditioner and detects the structure field. The utility model discloses a casing, circuit board and the forced induction device of setting in the casing, set up on the casing, with first gas circuit pipe and the second gas circuit pipe of forced induction device one side intercommunication, first gas circuit pipe and second gas circuit pipe intercommunication, the intraductal switch mechanism who opens or close that is equipped with of second gas circuit pipe still is including setting up the test socket at forced induction device opposite side, be equipped with singlechip and on-off control module on the circuit board, the singlechip links to each other with forced induction device and on-off control module respectively. The utility model has the advantages that: the blockage degree of the filter screen of the automobile air conditioner can be effectively measured.

Description

Automobile air conditioner filter screen blockage detection device

Technical Field

The utility model relates to an air conditioner detects the structure, especially relates to a vehicle air conditioner filter screen blocks up detection device.

Background

Along with environmental pollution and increasing health concerns of people, the cleanliness of a vehicle-mounted air conditioner filter screen is more and more emphasized by people, the filter screen is blocked, more energy is consumed in order to pursue the same refrigeration and heating effects, and the energy consumption of a vehicle is high; due to the fact that the space in the vehicle is small, after the filter screen is blocked, bacteria breeding is easy to suck by people, and health problems are caused; however, no good solution is available in the market at present, most of the solutions are changed once a year or once a few years, the filter screen is not known to be dirty and blocked, and resources are wasted when the filter screen is changed cleanly.

The blocking of the filter screen is detected, and an American group and a Grignard appliance respectively have a patent technology, and use an infrared correlation mode, when the filter screen is full of dust, the infrared correlation light can be blocked, and the light intensity received by an infrared receiving head is weakened, so that whether the blocking exists can be judged; however, in practical application, it is found that the existence of the opposite-jet pipe can block dust, and the filter screen in the middle of the opposite-jet pipe is always clean, so that whether the filter screen is blocked or not cannot be effectively detected.

In the field of micro differential pressure, the smaller the detected pressure is, the higher the required cost is, and the problems of linear drift and accumulated error of the sensor need to be faced, the detection range of the automobile filter screen sensor is less than 100Pa, if the zero drift is 10Pa, the error is more than 10%, the problem of the zero drift cannot be solved by a general sensor, 201020273461.3 the patent also mentions that the pressure transmitter is used for detecting the differential pressure, the whole text only mentions a pressure transmitter in general, but has no specific product structure and parameters, because the general pressure transmitter cannot detect actually: data on the order of 50pa typically does not allow the pressure transmitter to identify whether it is due to an error offset or is actually measured.

SUMMERY OF THE UTILITY MODEL

For solving the problem among the prior art, the utility model provides a vehicle air conditioner filter screen blocks up detection device has solved the error and the drift problem of sensor, listens vehicle air conditioner filter screen effectively and whether blocks up.

The utility model discloses a casing, circuit board and the forced induction device of setting in the casing, set up on the casing, with first gas circuit pipe and the second gas circuit pipe of forced induction device one side intercommunication, first gas circuit pipe and second gas circuit pipe intercommunication, the intraductal switch mechanism who opens or close that is equipped with of second gas circuit pipe still is including setting up the test socket at forced induction device opposite side, be equipped with singlechip and on-off control module on the circuit board, the singlechip links to each other with forced induction device and on-off control module respectively.

The utility model discloses make further improvement, the test A mouth of first gas circuit pipe sets up the back at the air conditioner filter screen, the test B mouth of second gas circuit pipe sets up the outlet side of air conditioner filter screen.

The utility model discloses make further improvement, the casing is hugged closely fixedly to the forced induction device, the test port sets up on the casing.

The utility model discloses make further improvement, the forced induction device is gas pressure sensor.

The utility model discloses make further improvement, on-off mechanism is including valve, solenoid valve, micro-gap switch, the coil of control gas circuit break-make.

The utility model is further improved, the valve control module comprises a power interface P1 connected with the power supply, a voltage conversion chip U2, a triode Q1 and a valve interface P2 connected with the valve, wherein,

a pin B1 of the voltage conversion chip U2 is connected with a pin 2 of a power interface P1 through an inductor L1, a pin A1 of the voltage conversion chip U2 is respectively connected with a collector of a triode Q1, a capacitor C4, one end of a capacitor C5, a cathode of a diode D1 and a pin 2 of the power interface P1, a pin 1 of the power interface P1, the capacitor C4, the other end of a capacitor C5 and an anode of the diode D1 are respectively grounded,

the base electrode of the triode Q1 is connected with the control pin 9 of the singlechip U1 through a resistor R4, the emitter electrode of the triode Q1 is respectively connected with the C1 pin of the voltage conversion chip U2 and a grounding resistor R2,

the pin B2 of the voltage conversion chip U2 is connected with the pin 1 of the valve interface P2 through more than one grounding capacitor, and the pin C2 and the pin A2 of the voltage conversion chip U2 are grounded.

Compared with the prior art, the beneficial effects of the utility model are that: the switching mechanism is adopted to control the on-off of the air path, so that the accumulated errors of measurement are eliminated, and the blockage degree of the filter screen of the automobile air conditioner can be effectively measured.

Drawings

FIG. 1 is a schematic view of the installation of the present invention;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a schematic circuit diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and 2, the utility model discloses a casing 1, circuit board and the gas pressure sensor 6 of setting in casing 1 set up on casing 1, with first gas circuit pipe 2 and the second gas circuit pipe 3 of 6 one side intercommunications of gas pressure sensor, first gas circuit pipe 2 and the 3 intercommunications of second gas circuit pipe, be equipped with in the second gas circuit pipe 3 and open or close the on-off mechanism 5 of second gas circuit pipe still includes the test port 7 of setting at 6 opposite sides of gas pressure sensor, be equipped with singlechip and on-off control module on the circuit board, the singlechip links to each other with gas pressure sensor 6 and on-off control module respectively.

The test a port 21 of the first air passage pipe 2 and the test B port 31 of the second air passage pipe 3 of this example are provided on both sides of the air conditioning screen 4, respectively, and the test a port is provided on the back surface of the air conditioning screen 4. The gas pressure sensor 6 in this example is fixed in close contact with the housing 1, and the test port 7 is a slit provided in the housing 1.

The switch mechanism 5 in this example is a valve, and may also be an electromagnetic valve, a microswitch, a coil, etc. for controlling the on/off of the gas path.

As shown in fig. 3, the gas pressure sensor in this example is a pressure sensing device, the single chip microcomputer U1 is a control device, the valve is an execution device, the single chip microcomputer U1 in this example is connected to the gas pressure sensor and the switch control module, and the single chip microcomputer U1 can measure the pressure data of the gas pressure sensor in real time.

The valve control module of this example includes a power interface P1 connected to a power supply, a voltage conversion chip U2, a transistor Q1, and a valve interface P2 connected to a valve, wherein,

a pin B1 of the voltage conversion chip U2 is connected with a pin 2 of a power interface P1 through an inductor L1, a pin A1 of the voltage conversion chip U2 is respectively connected with a collector of a triode Q1, a capacitor C4, one end of a capacitor C5, a cathode of a diode D1 and a pin 2 of the power interface P1, a pin 1 of the power interface P1, the capacitor C4, the other end of a capacitor C5 and an anode of the diode D1 are respectively grounded,

the base electrode of the triode Q1 is connected with the control pin 9 of the singlechip U1 through a resistor R4, the emitter electrode of the triode Q1 is respectively connected with the C1 pin of the voltage conversion chip U2 and a grounding resistor R2,

the pin B2 of the voltage conversion chip U2 is connected with the pin 1 of the valve interface P2 through more than one grounding capacitor, and the pin C2 and the pin A2 of the voltage conversion chip U2 are grounded.

The working principle of the embodiment is as follows:

the gas pressure sensor 6 of this example has 3 pressure ports: test port a 21, test port B31, and test port 7. During normal operation, the valve is first opened, so that the air flow is communicated from the test port a 21 to the test port B31, and the pressure is measured to be P1; then the valve is closed, only the test port A21 is arranged at the moment, the measured pressure is the back pressure, the pressure is P2, the two pressure values are subtracted, and the offset and the error caused by the accumulation of the sensor are removed, so that the test precision is improved.

When the gas pressure sensor leaves a factory, the sensor is calibrated, high-precision pressure calibration equipment is used for calibrating the sensor, and when the gas pressure sensor is normally electrified and works, zero drift can be effectively inhibited, and micro differential pressure measurement is realized.

The utility model discloses gas pressure sensor based on MEMS differential pressure technique, through the pressure differential value around detecting the filter screen, when blockking up with not blockking up, the pressure differential value around the filter screen is very different, can listen the filter screen effectively and block up or not.

Through reforming the structure of the micro differential pressure sensor, the valve is adopted to control the on-off of the gas circuit, the accumulation error of measurement is eliminated, a large amount of data acquisition for blocking the filter screen is carried out, the pressure range of the blocking level is determined, the drift accumulation linear error can be timely eliminated, and the blocking degree of the filter screen of the automobile air conditioner can be effectively measured.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims (6)

1. The utility model provides a vehicle air conditioner filter screen blocks up detection device which characterized in that: including casing, circuit board and the forced induction device of setting in the casing, set up on the casing, with first gas circuit pipe and the second gas circuit pipe of forced induction device one side intercommunication, first gas circuit pipe and second gas circuit pipe intercommunication, the intraductal switch on or close that is equipped with of second gas circuit the on-off mechanism of second gas circuit pipe still is including setting up the test socket at forced induction device opposite side, be equipped with singlechip and on-off control module on the circuit board, the singlechip links to each other with forced induction device and on-off control module respectively.

2. The device for detecting the blockage of the filter screen of the automobile air conditioner as claimed in claim 1, wherein: the test A mouth of first air circuit pipe sets up the back at the air conditioner filter screen, the test B mouth setting of second air circuit pipe is in the outlet side of air conditioner filter screen.

3. The device for detecting the blockage of the filter screen of the automobile air conditioner as claimed in claim 2, wherein: the pressure sensing device is tightly attached to the shell and fixed, and the test port is formed in the shell.

4. The device for detecting the blockage of the filter screen of the automobile air conditioner as claimed in claim 3, wherein: the pressure sensing device is a gas pressure sensor.

5. The device for detecting the blockage of the filter screen of the automobile air conditioner according to any one of claims 1 to 4, wherein: the switch mechanism comprises a valve for controlling the on-off of the gas path, an electromagnetic valve, a microswitch and a coil.

6. The device for detecting the blockage of the filter screen of the automobile air conditioner as claimed in claim 5, wherein: the switch mechanism is a valve, the switch control module comprises a power supply interface P1 connected with a power supply, a voltage conversion chip U2, a triode Q1 and a valve interface P2 connected with the valve, wherein,

a pin B1 of the voltage conversion chip U2 is connected with a pin 2 of a power interface P1 through an inductor L1, a pin A1 of the voltage conversion chip U2 is respectively connected with a collector of a triode Q1, a capacitor C4, one end of a capacitor C5, a cathode of a diode D1 and a pin 2 of the power interface P1, a pin 1 of the power interface P1, the capacitor C4, the other end of a capacitor C5 and an anode of the diode D1 are respectively grounded,

the base electrode of the triode Q1 is connected with the control pin 9 of the singlechip U1 through a resistor R4, the emitter electrode of the triode Q1 is respectively connected with the C1 pin of the voltage conversion chip U2 and a grounding resistor R2,

the pin B2 of the voltage conversion chip U2 is connected with the pin 1 of the valve interface P2 through more than one grounding capacitor, and the pin C2 and the pin A2 of the voltage conversion chip U2 are grounded.

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