Airflow guiding channel of dust sensor

Abstract

The utility model relates to an airflow guide channel of a dust sensor. An airflow guide channel of the dust sensor comprises an air inlet cavity, a transition cavity, a detection cavity and an air outlet cavity which are communicated in sequence; the air inlet cavity and the air outlet cavity of the transition cavity are transversely arranged; the detection cavity is vertically arranged; a light-emitting element and a light-receiving element of the dust sensor are arranged on the two sides of the detection cavity. The device is simple in structure, low in manufacturing cost and beneficial to large-scale popularization. To-be-detected air enters the transition cavity from the air inlet cavity and enters the air outlet cavity from the detection cavity, so that physical isolation of external light rays is formed, and the external light rays are prevented from entering the detection cavity from the air inlet cavity and the air outlet cavity to interfere a detection result; the air inlet cavity is isolated from the transition cavity in light path, and the air outlet cavity is isolated from the detection cavity in light path, so that external light cannot enter the detection cavity from the air inlet cavity and the air outlet cavity to interfere the detection result of the dust sensor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of dust sensor internal structure, in particular to a kind of airflow guide channel of dust sensor. BACKGROUND

[0002] Dust sensor is used to detect the equipment of dust particle content in air, usually including airflow guide channel, light-emitting element and light-receiving element. Airflow guide channel guides the air to be measured, so that the air to be measured passes between light-emitting element and light-receiving element; the working principle of dust sensor is that the light emitted by light-emitting element is reflected by dust particles in the air to be measured to weaken light intensity; light-receiving element receives light with weakened light intensity, and assesses dust particle content in circulating air according to the attenuation degree of light; in the prior art, airflow guide channel of dust sensor is usually provided with complex light path shielding structure to prevent external light from entering between light-emitting element and light-receiving element, which interferes with the detection of light-receiving element. However, such light path shielding structure has high manufacturing cost and is not conducive to wide promotion. SUMMARY

[0003] The utility model aims at solving the above problems, and provides an airflow guide channel of dust sensor.

[0004] The technical scheme of the utility model is: an airflow guide channel of dust sensor includes air inlet cavity, transition cavity, detection cavity and air outlet cavity in sequence; the air to be measured enters the airflow guide channel from the air inlet cavity, and leaves the airflow guide channel from the air outlet cavity, and passes through the transition cavity and the detection cavity in sequence in the middle; the air inlet cavity and the air outlet cavity are both horizontally arranged; the detection cavity is vertically arranged; the air to be measured needs to turn once when entering the transition cavity from the air inlet cavity and entering the air outlet cavity from the detection cavity, which forms physical isolation of external light to prevent external light from entering the detection cavity from the air inlet cavity and the air outlet cavity, thereby interfering with the detection result; the light-emitting element and the light-receiving element of the dust sensor are arranged on both sides of the detection cavity to detect the air to be measured; because the light path between the air inlet cavity and the transition cavity is isolated, and the light path between the air outlet cavity and the detection cavity is isolated, external light cannot enter the detection cavity from the air inlet cavity and the air outlet cavity, thereby interfering with the detection result of the dust sensor; wherein, after the external light entering from the air inlet cavity is consumed by the air inlet cavity, residual light still enters the transition cavity; the transition cavity can also consume the residual external light.

[0005] Preferably, the air inlet cavity is communicated with the bottom of the transition cavity; a heating sheet is arranged at the center below the bottom of the transition cavity; the detection cavity is communicated with the top of the transition cavity; the heating sheet provides heat energy to make the air to be measured in the transition cavity rise; the air to be measured after rising passes through the detection cavity and the air outlet cavity to leave; and the air inlet cavity reenters external air to be measured due to the leaving of the air to be measured in the transition cavity; in this way, a guide airflow of air to be measured is formed in the dust sensor.

[0006] Preferably, the air inlet cavity is in communication with the side of the excess cavity bottom; the air to be tested entering the air inlet cavity makes a first upward turn at the excess cavity bottom before entering the middle of the excess cavity; the air outlet cavity is in communication with the side of the detection cavity top; the air to be tested discharged from the detection cavity needs to make a first horizontal turn at the detection cavity top before being smoothly discharged; thus the isolation effect of external light is better.

[0007] Further, the air inlet cavity is provided with an air inlet; the air outlet cavity is provided with an air outlet; the air inlet and the air outlet are arranged on the front of the dust sensor shell; the air to be tested entering the air inlet cavity and the air to be tested discharged from the air outlet cavity both increase a horizontal turn, thus increasing the external light isolation effect at the air inlet cavity and the air outlet cavity.

[0008] Further, the detection cavity and the excess cavity are centrally arranged left and right, thus ensuring that the excess cavity fully consumes residual light.

[0009] Preferably, the detection cavity and the excess cavity are staggered front and back; the front of the dust sensor is provided with an inner recess A corresponding to the position of the detection cavity, thus separating the excess cavity and the detection cavity to a certain extent; the air to be tested entering the detection cavity first makes a turn before passing between the light emitting element and the light receiving element, thus preventing external light entering from the air inlet cavity from entering the detection cavity and avoiding light emitted by the light emitting element from entering the excess cavity.

[0010] Further, the width of the detection cavity in the left-right direction is less than the width of the excess cavity in the left-right direction, thus making only part of the top of the excess cavity directly communicate with the detection cavity; the part of the top of the excess cavity not communicating with the detection cavity reflects and consumes residual light.

[0011] Further, the width of the air outlet cavity in the left-right direction is greater than the width of the detection cavity in the left-right direction, thus being able to improve the exhaust speed of the air outlet cavity.

[0012] Further, the width of the air outlet cavity in the front-back direction is greater than the width of the detection cavity in the front-back direction, thus being able to improve the exhaust speed of the air outlet cavity.

[0013] Further, the back of the dust sensor is provided with an inner recess B corresponding to the inner recess A; the distance between the inner recess A and the inner recess B is equivalent to the front-back width of the excess cavity, thus ensuring the flow stability of the air to be tested in the detection cavity and being conducive to the detection of the dust sensor.

[0014] Further, the lower end surface of the inner recess A is provided with a guide slope A, which guides the air to be tested entering the detection cavity; the upper end surface of the inner recess A and the upper end surface of the inner recess B are provided with a guide slope B, which guides the air to be tested entering the air outlet cavity; the guide slope A and the guide slope B are conducive to maintaining the air to be tested in the detection cavity in a stable state and being conducive to the detection of the dust sensor.

[0015] The dust sensor has the following advantages:

[0016] (1) The dust sensor has simple structure, low manufacturing cost and is conducive to wide promotion. The air to be measured enters the transition chamber from the air inlet chamber and enters the air outlet chamber from the detection chamber, which needs to turn once, forms physical isolation of external light, prevents external light from entering the detection chamber from the air inlet chamber and the air outlet chamber, and interferes with the detection result; because the light path between the air inlet chamber and the transition chamber is isolated, and the light path between the air outlet chamber and the detection chamber is isolated, external light cannot enter the detection chamber from the air inlet chamber and the air outlet chamber, and interference with the detection result of the dust sensor is avoided.

[0017] (2) The heating sheet provides heat energy, so that the air to be measured in the transition chamber is heated and rises; the air to be measured after rising passes through the detection chamber and the air outlet chamber and leaves; and the air inlet chamber reenters the external air to be measured due to the departure of the air to be measured in the transition chamber; in this way, a guiding air current of the air to be measured is formed in the dust sensor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure diagram of the air flow guiding channel of the dust sensor of the utility model;

[0019] Figure 2 is Figure 1 A-A sectional view of

[0020] Figure 3 is a perspective view of the dust sensor in which the air flow guiding channel of the dust sensor is located;

[0021] In the figure: 1. air inlet chamber, 11. air inlet, 2. transition chamber, 21. heating sheet, 3. detection chamber, 31. inner recess A, 32. inner recess B, 33. guiding inclined surface A, 34. guiding inclined surface B, 4. air outlet chamber, 41. air outlet, 51. maintenance opening, 52. maintenance cover;

[0022] The direction indicated by the arrow in the figure is the direction of gas flow. DETAILED DESCRIPTION

[0023] Example one: refer to Figures 1-3, an air flow guiding channel of a dust sensor includes an air inlet chamber 1, a transition chamber 2, a detection chamber 3, and an air outlet chamber 4 that are connected in sequence; the air to be tested enters the air flow guiding channel from the air inlet chamber 1 and leaves the air flow guiding channel from the air outlet chamber 4, passing through the transition chamber 2 and the detection chamber 3 in sequence; the air inlet chamber 1 and the air outlet chamber 4 of the transition chamber 2 are both arranged horizontally; the detection chamber 3 is arranged vertically; the air to be tested needs to turn once when entering the transition chamber 2 from the air inlet chamber 1 and when entering the air outlet chamber 4 from the detection chamber 3, thereby forming a physical isolation of external light to prevent external light from entering the air inlet chamber 1 and the air outlet chamber 4 Entering the detection chamber 3, interfering with the detection result; the light-emitting element and the light-receiving element of the dust sensor are arranged on both sides of the detection chamber 3 to detect the air to be tested; because the optical path between the air inlet chamber 1 and the transition chamber 2 is isolated, and the optical path between the air outlet chamber 4 and the detection chamber 3 is isolated, external light cannot enter the detection chamber 3 from the air inlet chamber 1 and the air outlet chamber 4, and interfere with the detection result of the dust sensor; among them, the external light entering from the air inlet chamber 1 is consumed by the air inlet chamber 1, and there is still residual light entering the transition chamber 2; the transition chamber 2 can also consume the residual external light.

[0024] Compared with the existing technology, the present invention has a simple structure and low manufacturing cost, which is conducive to large-scale promotion. The air to be tested must turn once when entering the transition chamber 2 from the air inlet chamber 1 and the air outlet chamber 4 from the air detection chamber 3, forming a physical isolation from external light, so as to prevent external light from entering the detection chamber 3 from the air inlet chamber 1 and the air outlet chamber 4 and interfering with the detection results. Because the light path between the air inlet chamber 1 and the transition chamber 2 is isolated, and the light path between the air outlet chamber 4 and the detection chamber 3 is isolated, external light cannot enter the detection chamber 3 from the air inlet chamber 1 and the air outlet chamber 4 and interfere with the detection results of the dust sensor.

[0025] The air inlet chamber 1 is connected with the bottom of the transition chamber 2; a heating plate 21 is provided at the center below the bottom of the transition chamber 2; the detection chamber 3 is connected with the top of the transition chamber 2; the heating plate 21 provides thermal energy, so that the air to be measured inside the transition chamber 2 is heated and rises; the air to be measured after rising passes through the detection chamber 3 and the air outlet chamber 4 and leaves; and the air inlet chamber 1 re-enters the external air to be measured because the air to be measured inside the transition chamber 2 leaves; in this way, a guiding airflow of the air to be measured is formed inside the dust sensor.

[0026] See also Figure 1 The air inlet chamber 1 is connected to the bottom side of the transition chamber 2; the air to be tested entering the air inlet chamber 1 makes an upward turn at the bottom of the transition chamber 2 before entering the middle of the transition chamber 2; the air outlet chamber 4 is connected to the top side of the detection chamber 3; the air to be tested discharged from the detection chamber 3 needs to make a horizontal turn at the top of the detection chamber 3 before it can be discharged smoothly; this has a better effect of isolating from external light.

[0027] See also Figure 2The air inlet cavity 1 is provided with an air inlet 11; the air outlet cavity 4 is provided with an air outlet 41; the air inlet 11 and the air outlet 41 are arranged on the front surface of the dust sensor shell; the air to be measured entering the air inlet 11 into the air inlet cavity 1 and the air to be measured discharged from the air outlet 41 of the air outlet cavity 4 both increase a horizontal turning, thereby increasing the external light isolation effect at the air inlet cavity 1 and the air outlet cavity 4.

[0028] The detection cavity 3 and the excessive cavity 2 are arranged centrally left and right, thereby ensuring that the excessive cavity 2 fully consumes the residual light.

[0029] Referring to Figure 2 The detection cavity 3 and the excessive cavity 2 are arranged staggeredly front and back; the dust sensor front surface is provided with an inner concave shell 31 corresponding to the detection cavity 3, thereby separating the excessive cavity 2 and the detection cavity 3 to a certain extent; the air to be measured enters the detection cavity 3 without passing between the light emitting element and the light receiving element, thereby first turning, thereby preventing the external light entering from the air inlet cavity 1 from entering the detection cavity 3, and avoiding the light emitted by the light emitting element from entering the excessive cavity 2.

[0030] Referring to Figure 1 The width of the detection cavity 3 in the left and right directions is less than the width of the excessive cavity 2 in the left and right directions, thereby making only a part of the top of the excessive cavity 2 directly communicate with the detection cavity 3; the part of the top of the excessive cavity 2 not communicating with the detection cavity 3 reflects and consumes the residual light.

[0031] The width of the air outlet cavity 4 in the left and right directions is greater than the width of the detection cavity 3 in the left and right directions, thereby being capable of improving the exhaust speed of the air outlet cavity 4.

[0032] The width of the air outlet cavity 4 in the front and back directions is greater than the width of the detection cavity 3 in the front and back directions, thereby being capable of improving the exhaust speed of the air outlet cavity 4.

[0033] The dust sensor front surface is provided with an access hole 51 corresponding to the position of the excessive cavity 2; the access hole 51 is buckled with an access cover 52; the inside of the excessive cavity 2 can be repaired through the access hole 51, such as removing the dust remaining at the bottom of the excessive cavity 2 and repairing the heating sheet 21.

[0034] The working principle of the embodiment is as follows: the air to be measured enters the airflow guide channel from the air inlet cavity 1, exits the airflow guide channel from the air outlet cavity 4, and sequentially passes through the transition cavity 2 and the detection cavity 3 in between; the air to be measured needs to turn once when entering the transition cavity 2 from the air inlet cavity 1 and entering the air outlet cavity 4 from the detection cavity 3, thereby forming physical isolation of external light to prevent external light from entering the detection cavity 3 from the air inlet cavity 1 and the air outlet cavity 4 and interfering with the detection result; because of the optical path isolation between the air inlet cavity 1 and the transition cavity 2 and the optical path isolation between the air outlet cavity 4 and the detection cavity 3, external light cannot enter the detection cavity 3 from the air inlet cavity 1 and the air outlet cavity 4 to interfere with the detection result of the dust sensor. The heating sheet 21 provides heat energy, so that the air to be measured in the transition cavity 2 is heated and rises; the air to be measured after rising passes through the detection cavity 3 and the air outlet cavity 4 and exits; and the air inlet cavity 1 reenters the external air to be measured due to the exit of the air to be measured in the transition cavity 2. In this way, a guided airflow of the air to be measured is formed inside the dust sensor.

[0035] Embodiment Two: Embodiment Two is basically the same as Embodiment One, and the same parts will not be described again. The difference is that: the back of the dust sensor is provided with an inner recess B 32 corresponding to the inner recess A 31 at the corresponding position of the detection cavity 3; the distance between the inner recess A 31 and the inner recess B 32 is equivalent to the front-to-back width of the transition cavity 2, which ensures the stability of the flow of the air to be measured in the detection cavity 3 and is conducive to the detection of the dust sensor.

[0036] The lower end surface of the inner recess A 31 is provided with a guide slope A 33 for guiding the air to be measured entering the detection cavity 3; the upper end surface of the inner recess A 31 and the upper end surface of the inner recess B 32 are provided with a guide slope B 34 for guiding the air to be measured entering the air outlet cavity 4; the guide slope A 33 and the guide slope B 34 are conducive to maintaining the air to be measured in the detection cavity 3 in a stable state and are conducive to the detection of the dust sensor.

Claims

1. An airflow guide passage of a dust sensor, characterized by, The dust sensor comprises a gas inlet cavity, an excess cavity, a detection cavity and a gas outlet cavity which are sequentially connected; the gas inlet cavity and the gas outlet cavity are horizontally arranged; the detection cavity is vertically arranged; the light emitting element and the light receiving element of the dust sensor are arranged on both sides of the detection cavity.

2. The airflow guide passage of the dust sensor according to claim 1, characterized by: The gas inlet cavity is communicated with the bottom of the excess cavity; a heating sheet is arranged at the center below the bottom of the excess cavity; the detection cavity is communicated with the top of the excess cavity.

3. The airflow guide passage of the dust sensor according to claim 1, characterized by: The gas inlet cavity is communicated with the side of the bottom of the excess cavity; the gas outlet cavity is communicated with the side of the top of the detection cavity.

4. The airflow guide passage of the dust sensor according to claim 3, characterized by: The gas inlet cavity is provided with a gas inlet; the gas outlet cavity is provided with a gas outlet; the gas inlet and the gas outlet are arranged on the front surface of the dust sensor shell.

5. The airflow guide passage of the dust sensor according to claim 1, characterized by: The detection cavity and the excess cavity are arranged in a staggered manner; the front surface of the dust sensor is provided with an inner recess A corresponding to the detection cavity; the back surface of the dust sensor is provided with an inner recess B corresponding to the inner recess A.

6. The airflow guiding channel of the dust sensor according to claim 2, characterized in that: The width of the detection cavity in the left-right direction is less than the width of the excess cavity in the left-right direction.

7. The airflow guide channel of the dust sensor according to claim 6, characterized in that: The width of the gas outlet cavity in the left-right direction is greater than the width of the detection cavity in the left-right direction.

8. The airflow guide channel of the dust sensor according to claim 7, characterized in that: The width of the gas outlet cavity in the front-rear direction is greater than the width of the detection cavity in the front-rear direction.

9. The airflow guide passage of the dust sensor according to claim 5, characterized by: The back surface of the dust sensor is provided with an inner recess B corresponding to the inner recess A; the distance between the inner recess A and the inner recess B is equivalent to the front-rear width of the excess cavity.

10. The airflow guide channel of the dust sensor according to claim 9, characterized in that: The lower end surface of the inner recess A is provided with a guide slope A; the upper end surface of the inner recess A and the upper end surface of the inner recess B are provided with a guide slope B.

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