CN112432346A

CN112432346A - Sensor cleaning assembly, sensor and air conditioning system

Info

Publication number: CN112432346A
Application number: CN202011430348.6A
Authority: CN
Inventors: 羡浩博; 苗岑岑; 艾超
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-03-02
Anticipated expiration: 2040-12-07
Also published as: CN112432346B

Abstract

The application provides a clean subassembly of sensor, sensor and air conditioning system. The sensor cleaning assembly comprises a polarization device, a first polarization device and a second polarization device, wherein the polarization device is arranged on a sensor inlet pipeline, so that dust entering a sensor cavity is provided with a first polarity; the collecting device is arranged in the inlet pipeline and is positioned at the downstream of the polarization device; the collecting means has a second polarity; wherein the second polarity is opposite the first polarity. The dust is charged with static electricity by adopting a polarization device, and the dust with the polarity is adsorbed by utilizing a collection device by using the electrostatic adsorption principle, so that the dust is prevented from being attached to a cavity of the sensor.

Description

Sensor cleaning assembly, sensor and air conditioning system

Technical Field

The application belongs to the technical field of air conditioning systems, and particularly relates to a sensor cleaning assembly, a sensor and an air conditioning system.

Background

With the improvement of living standard of people, the attention on the air quality in the environment is continuously improved, and in order to meet the requirement of monitoring the air quality, an environment sensor such as an air quality sensor (CO)₂PM2.5), etc. are increasingly in demand. The carbon dioxide concentration is one of important indexes for measuring the air quality, various sensors for detecting the carbon dioxide concentration exist on the market, and the carbon dioxide sensor based on the non-dispersive infrared (NDIR) technology becomes a popular choice by virtue of the characteristics of good stability, high precision and the like.

The existing NDIR carbon dioxide sensor uses a filter membrane to filter suspended particles in air, but the filtering diameter of the filter membrane is about 1 micron, and smaller particles cannot be filtered; the long-time particle accumulation easily causes the reduction of the light reflectivity of the inner wall of the chamber, and influences the output precision of the sensor.

Disclosure of Invention

Therefore, an object of the present application is to provide a sensor cleaning assembly, a sensor, and an air conditioning system, which can prevent dust from adhering to a sensor chamber.

In order to solve the above problems, the present application provides a sensor cleaning assembly including:

the polarization device is arranged on the sensor inlet pipeline, so that dust entering the sensor cavity has a first polarity;

the collecting device is arranged in the inlet pipeline and is positioned at the downstream of the polarization device; the collecting means has a second polarity; wherein the second polarity is opposite the first polarity.

Optionally, the collecting means is ring-shaped, the size of the collecting means being smaller than the size of the inlet duct.

Optionally, the collecting device is circumferentially provided with a gap.

Optionally, the collecting device is provided in plurality and arranged along the axial direction of the inlet pipeline.

Optionally, the gaps on adjacent collecting devices are arranged in a staggered manner.

According to another aspect of the present application, there is provided a gas sensor comprising a sensor cleaning assembly as described above.

Optionally, the gas sensor further comprises a filter element covering the inlet end of the inlet pipeline.

Optionally, the polarization means is provided between the filter element and the collection means.

According to a further aspect of the present application, there is provided an air conditioning system comprising a sensor cleaning assembly as described above or a gas sensor as described above.

The application provides a clean subassembly of sensor includes: the polarization device is arranged on the sensor inlet pipeline, so that dust entering the sensor cavity has a first polarity; the collecting device is arranged in the inlet pipeline and is positioned at the downstream of the polarization device; the collecting means has a second polarity; wherein the second polarity is opposite the first polarity. The dust is charged with static electricity by adopting a polarization device, and the dust with the polarity is adsorbed by utilizing a collection device by using the electrostatic adsorption principle, so that the dust is prevented from being attached to a cavity of the sensor.

Drawings

FIG. 1 is a schematic structural diagram of a gas sensor according to an embodiment of the present application;

FIG. 2 is a left side view of the embodiment of the present application in FIG. 1;

fig. 3 is a schematic structural diagram of a collecting device according to an embodiment of the present application.

The reference numerals are represented as:

1. a chamber; 11. an inlet line; 2. a polarization means; 3. a collection device; 31. opening the gap; 4. and (4) filtering the membrane.

Detailed Description

Referring collectively to fig. 1-3, according to an embodiment of the present application, a sensor cleaning assembly includes:

the polarization device 2 is arranged on the sensor inlet pipeline 11 and enables dust entering the sensor cavity 1 to have a first polarity;

a collecting device 3, arranged in said inlet duct 11, downstream of said polarization means 2; the collecting device 3 is provided with a second polarity; wherein the second polarity is opposite the first polarity.

Set gradually polarization device 2 and collection device 3 on the inlet pipeline 11 of sensor, polarization device 2 enables to get into the dust belt of inlet pipeline 11 and carries polarity, and collection device 3 is last to have the polarity opposite with the dust polarity, consequently collection device 3 can adsorb the dust, avoids the dust to get into cavity 1.

In some embodiments, the collecting device 3 is ring-shaped, the size of said collecting device 3 being smaller than the size of said inlet duct 11.

The collecting device 3 is in a ring shape with the size smaller than that of the inlet pipeline 11, dust carried in gas can be adsorbed by the polar ring body when the gas conveniently passes through the collecting device, and the effect is good.

In some embodiments, the collecting device 3 is circumferentially provided with a gap 31.

The ring shape with the notch 31 is adopted, so that the polarity effect of the collecting device 3 is good, and the adsorption force is strong.

In some embodiments, the collecting device 3 is provided in plurality, arranged in axial alignment with said inlet duct 11.

The plurality of collecting devices 3 are arranged in the axial direction, and the effect of dust adsorption can be improved.

In some embodiments, the gaps 31 are offset between adjacent collecting devices 3.

Since the collecting device 3 is in the shape of a ring with the slits 31, the adjacent slits 31 are arranged in a staggered manner to improve the adsorption effect.

In some embodiments, the gas sensor further comprises a filter element covering the inlet end of the inlet line 11.

Through addding filtering piece, filter the gas that gets into sensor cavity 1, prevent that the great dust of granule from getting into, alleviate absorbent burden.

In some embodiments, the polarizing means 2 are arranged between said filter and said collecting means 3.

The polarization device 2 is arranged at the downstream of the filter element and is used for polarizing the filtered small particle dust so as to facilitate the adsorption and collection of the downstream collection device 3; or the polarization device 2 can be arranged on the filter element, and the discharge point which has the polarization effect on the dust is positioned between the filter element and the collection device 3, so that the polarization effect can be achieved.

The gas sensor shown in fig. 3 mainly comprises a chamber 1, a light source, a detector, a collecting device 3, a polarization device 2 and related circuits. The shape of the cavity 1 is not fixed, light rays are emitted from a light source and reach a detector through reflection at a specific angle, the light source starts to work after receiving a control signal, the emitted light rays penetrate through the cavity 1 and irradiate the detector, and the detector converts optical signals into electric signals to be output; the collecting device 3 is arranged on an air inlet pipeline of the chamber 1, is in a ring shape, is connected with one end of a power supply, and has the polarity opposite to that of the polarizing device 2 so as to collect particles attached to the inner wall of the chamber 1; the polarization device 2 is arranged on the air inlet pipeline and is positioned between a filtering piece such as a filtering membrane 4 and the collection device 3; the related circuit comprises a sensor control unit and an auxiliary circuit thereof, a detector signal amplifying circuit and a power supply circuit.

The polarization device 2 is responsible for attaching charges to small particle suspended matters which cannot be filtered by the filter membrane 4, so that the small particle suspended matters have polarity; the polarization device 2 is a single-pole charger which emits single-pole electrons outwards, dust particles change to have polarity after being irradiated by the single-pole charger, and at the moment, dust can be adsorbed by putting an electrode with opposite polarity. During the sensor power-up, the unipolar charger is always in operation, and even if the sensor is not in operation, the unipolar charger emits charges outwards, preventing the suspended particles from entering the chamber 1 along with the gas diffusion.

The collecting device 3 is a plurality of unclosed circular rings, the sizes of the circular rings can be different, but the diameter of each circular ring is smaller than the minimum diameter of the air inlet pipeline, and the diameter of the inner part of the air inlet pipeline cannot be completely consistent due to a processing technology, so that the diameter of the inner part of the air inlet pipeline needs to be smaller than the minimum diameter; the collecting device 3 can be ensured to be placed in the air inlet pipeline so as to ensure the dust collecting effect; the collecting device 3 is made of activated carbon, so that attracted suspended particles can be adsorbed under the condition of ensuring the conductive capacity, and the particles are prevented from falling off after power failure to cause secondary pollution. The circular ring is connected with the base through the conductive handle, and the base is fixed on the inner wall of the air inlet pipeline; the collecting device 3 is connected with the power supply circuit of the sensor circuit board through conduction, so that the collecting device has polarity and can attract polarized dust particles.

When the sensor is powered on, the polarization device 2 and the collection device 3 start to work, no matter whether the sensor receives a starting instruction or not, and the purpose is to prevent the increase of optical path reflection error and the reduction of sensor precision caused by the fact that dust enters the chamber 1 along with the flow of gas and adheres to the inner wall of the chamber 1 during the stop work of the sensor. The gas enters the sensor chamber 1 by free diffusion, initially passes through primary filtration by a filter membrane 4, filtering out particulate matter above 1 micron; after passing through the filter membrane 4, the small particulate matter is irradiated by the polarization device 2, has unipolar electrons, is attracted by the opposite charges when passing through the collection device 3, is adsorbed on the collection device 3, and is adsorbed by the collection device 3.

It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. A sensor cleaning assembly, comprising:

the polarization device (2) is arranged on the sensor inlet pipeline (11) and enables dust entering the sensor cavity (1) to have a first polarity;

-a collecting device (3) arranged in said inlet duct (11) downstream of said polarization means (2); the collecting device (3) is provided with a second polarity; wherein the second polarity is opposite the first polarity.

2. Sensor cleaning assembly according to claim 1, characterized in that the collecting device (3) is ring-shaped, the size of the collecting device (3) being smaller than the size of the inlet duct (11).

3. Sensor cleaning assembly according to claim 2, characterized in that the collecting device (3) is circumferentially provided with a gap (31).

4. A sensor cleaning assembly according to claim 3, characterized in that said collecting means (3) are provided in plurality, arranged in axial alignment along said inlet duct (11).

5. Sensor cleaning assembly according to claim 4, characterized in that the gaps (31) on adjacent collecting devices (3) are arranged offset.

6. A gas sensor comprising a sensor cleaning assembly according to any one of claims 1 to 5.

7. The gas sensor according to claim 6, further comprising a filter element covering the inlet end of the inlet conduit (11).

8. Gas sensor according to claim 7, characterized in that the polarization means (2) are provided between the filter element and the collecting means (3).

9. An air conditioning system comprising a sensor cleaning assembly according to any of claims 1-5 or a gas sensor according to any of claims 6-8.