Smoke sensor

Abstract

The utility model discloses a smoke sensor, which is characterized by comprising a shell, a circuit board, a smoke probe, an elastic pad and a compression ring, the shell comprises an upper shell and a lower shell; the lower shell is provided with a flange part and a lower cylinder part, and an air inlet hole is formed in the lower cylinder part; the edge of the flange part is fixedly connected with the lower end of the upper shell; the pressing ring is attached to and fixed to the upper surface of the flange part through an elastic pad. A stand column is arranged on the upper surface of the flange part; the circuit board is fixedly connected with the upper end of the stand column. The circuit board is located in the upper shell, and the smoke probe is integrated below the circuit board; and the shell sleeve of the smoke probe is sleeved by the elastic cushion. The smoke sensor provided by the utility model can prevent the circuit board in the shell from dust accumulation during smoke detection, can avoid circuit and control failure, ensures safety performance, and is particularly suitable for safety monitoring under a mine.

Description

Technical Field

[0001] The utility model relates to a smoke sensor. Background Art

[0002] The mine-used smoke sensor is used to monitor the smoke caused by mechanical failure friction, cable heating, coal seam spontaneous combustion, etc. in the coal mine, and is used as the detection of the smoke protection signal in the mine. The existing mine-used smoke sensor has a housing and a circuit board integrated with a smoke probe. The smoke probe and the circuit board are in the housing and there are air inlets on the housing, and the air in the mine is communicated with the inside of the housing through the air inlets, and the smoke probe senses the air condition in the mine. Since the air in the mine is poor and contains a large amount of moisture, dust (such as coal ash, etc.), and the poor air enters the housing and adheres to the circuit board, causing the circuit board to accumulate dust and become damp, etc., thereby affecting the performance parameters of the circuit board, damaging the circuit board, causing control failure or ineffectiveness, affecting the service life, and having potential safety hazards. Content of the Utility Model

[0003] The utility model provides a smoke sensor, which solves the problem that the existing mine-used smoke sensor has poor air entering the housing and directly contacting the circuit board, thereby affecting the performance.

[0004] In order to achieve the above purpose, the solution of the utility model is: a smoke sensor, characterized in that: it includes a housing, a circuit board, a smoke probe, an elastic pad and a pressing ring; the housing includes an upper housing and a lower housing; the lower housing has a flange part and a lower barrel part, and there are air inlets on the lower barrel part; the edge of the flange part is fixedly connected to the lower end of the upper housing; the pressing ring is attached to and fixed to the upper surface of the flange part through the elastic pad; there are columns on the upper surface of the flange part; the circuit board is fixedly connected to the upper ends of the columns; the circuit board is located in the upper housing, and the smoke probe is integrated below the circuit board; the housing sleeve of the smoke probe is sleeved by the elastic pad.

[0005] With the above solution, during operation, the air in the mine enters the lower housing through the air inlet holes in the lower cylinder part of the lower housing, and then directly contacts the induction end at the lower end of the smoke detector. Therefore, the smoke detector can normally detect whether there is smoke in the air. Since the pressure ring is attached to and fixed to the upper surface of the flange part through an elastic pad, the circuit board is located inside the upper housing, and the smoke detector is integrated below the circuit board; the housing sleeve of the smoke detector is sleeved by the elastic pad, so that a seal is formed between the housing sleeve of the smoke detector and the elastic pad, and the air in the lower cylinder part is prevented from entering the upper housing and contacting the circuit board upward, which can avoid bad air adhering to the circuit board, prevent the circuit board from accumulating dust and getting wet, ensure the stability of the performance parameters of the circuit board, prevent control failure, extend the service life, and improve safety. Therefore, it can solve the problem that in the existing mine smoke sensor, bad air will enter the housing and directly contact the circuit board, thereby affecting the performance.

[0006] In addition, since the pressure ring is attached to and fixed to the upper surface of the flange part through an elastic pad, and the pressure ring rigidly presses the elastic pad, the elastic pad can maintain a tight seal with the upper surface of the flange part, improving the sealing performance; at the same time, the overall shape of the elastic pad is stable and it maintains an outer sleeve sealing state with the housing sleeve of the smoke detector. And there is a certain height difference between the circuit board and the flange part, which is convenient for heat dissipation and also reduces the temperature interference on the smoke detector.

[0007] Further, the smoke detector adopts the MQ-2 model.

[0008] Further, a signal lamp is integrated on the circuit board; a lamp cover is provided on the flange part; the signal lamp extends into the lamp cover; the lamp cover is made of a transparent material. And through this signal lamp, it is convenient to observe the working state of the smoke sensor.

[0009] Further, there are two signal lamps and two lamp covers. They can be a red light and a green light respectively, representing different working states. For example, when the red light is on, it means it is already in protection, and when the green light is on, it means the power supply is normal.

[0010] Further, there are two columns; the circuit board is fixed to the two columns through first screws respectively. There is a certain height difference between the circuit board and the flange part, which is convenient for heat dissipation.

[0011] Further, a step surface is provided inside the lower end of the upper housing; the flange part is inserted into the lower end of the upper housing; the edge of the flange part is attached to the step surface through a sealing ring and fixed through second screws. Since the edge of the flange part is sealed with the step surface through a sealing ring, air can be completely prevented from entering. Since the second screw is a detachable fixing, it can be disassembled for maintenance or part replacement, and at the same time, the product is very convenient to assemble during production.

[0012] Furthermore, threaded posts are provided on the upper surface of the flange portion; the threaded posts sequentially pass through the elastic pad and the pressure ring upward and then cooperate with nuts for locking and fixing. Since the threaded posts and nuts are used for detachable fixation, maintenance or component replacement can be carried out by disassembling, and at the same time, the assembly during product production is also very convenient.

[0013] Furthermore, a lifting ring is provided at the top end of the upper housing.

[0014] Furthermore, a waterproof connector is installed on the flange portion. Cables can pass through the waterproof connector and it can play a role in waterproof sealing.

[0015] Furthermore, a number of air inlet holes are provided on the side wall of the lower cylindrical portion; a number of ash discharge holes are provided on the bottom wall of the lower cylindrical portion.

[0016] Furthermore, a switch button is installed on the flange portion. The start and stop operations can be controlled by pressing the switch button.

[0017] The beneficial effects of the present utility model:

[0018] First, the present utility model can be used for detecting the smoke in the air in a mine. Since the pressure ring is attached to and fixed to the upper surface of the flange portion through the elastic pad, the circuit board is located inside the upper housing, and the smoke probe is integrated below the circuit board; the housing sleeve of the smoke probe is sleeved by the elastic pad, so that a seal is formed between the housing sleeve of the smoke probe and the elastic pad, and the air inside the lower cylindrical portion is prevented from entering upward into the upper housing to contact the circuit board, which can avoid bad air adhering to the circuit board, prevent the circuit board from accumulating dust and getting wet, ensure the stability of the performance parameters of the circuit board, prevent control failure, extend the service life, and improve safety; when detecting smoke, this smoke sensor can prevent the circuit board inside the housing from accumulating dust, avoid circuit and control failure, and ensure safety performance, especially suitable for underground safety monitoring;

[0019] Second, in the present utility model, since the pressure ring is attached to and fixed to the upper surface of the flange portion through the elastic pad, and the pressure ring rigidly presses the elastic pad, the elastic pad can be kept in close contact and sealed with the upper surface of the flange portion, improving the sealing performance; at the same time, the overall shape of the elastic pad is stabilized and it keeps an outer sleeve sealing state with the housing sleeve of the smoke probe;

[0020] Third, in the present utility model, since the circuit board and the column are fixed by the first screw, a certain height difference is formed between the circuit board and the flange portion, which is convenient for heat dissipation and also reduces the temperature interference on the smoke probe;

[0021] Fourthly, in the present utility model, a plurality of air intake holes are provided on the side wall of the lower cylinder part, and a plurality of ash discharge holes are provided on the bottom wall of the lower cylinder part. Dust on the inner wall of the lower cylinder part or on the smoke detector head can be cleaned and dropped by shaking or blowing air into the lower cylinder part with tools such as an air gun, and then the dust is discharged from the ash discharge holes, which is very convenient for maintenance and will not affect the electrical components and circuits on the circuit board in the upper shell. Description of the Drawings

[0022] Figure 1 is the front view of a smoke sensor in the present utility model.

[0023] Figure 2 is the bottom view of a smoke sensor in the present utility model.

[0024] Figures 3-4 is the perspective view of a smoke sensor in the present utility model.

[0025] Figure 5 is the sectional perspective view of a smoke sensor in the present utility model.

[0026] Figure 6 is the comparison diagram of the lower housing assembly before and after assembly.

[0027] Figure 7 is the exploded view of the lower housing assembly, the sealing ring and the upper housing before assembly.

[0028] Figure 8 is the perspective view when the smoke detector head and the signal lamp are integrated on the circuit board. Detailed Embodiment

[0029] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0030] Embodiment 1: Refer to Figures 1-7 , a smoke sensor, which includes a housing 1, a circuit board 2, a smoke detector head 3, an elastic pad 4 and a retaining ring 5.

[0031] It can be referred to Figures 1-7 , the housing 1 includes an upper housing 1-1 and a lower housing 1-2; the lower housing 1-2 has a flange portion 1-21 and a lower cylinder portion 1-22, and air intake holes 1-221 are provided on the lower cylinder portion 1-22; and external air can enter the lower cylinder portion 1-22 from the air intake holes 1-221.

[0032] It can be referred to Figures 5-7, wherein, the edge of the flange portion 1-21 of the lower housing 1-2 is fixedly connected to the lower end of the upper housing 1-1. In this embodiment, a stepped surface 1-11 is provided inside the lower end of the upper housing 1-1; the flange portion 1-21 is inserted into the lower end of the upper housing 1-1; the edge of the flange portion 1-21 is attached to the stepped surface 1-11 through a sealing ring 8 and fixed by a second screw 9. Since the edge of the flange portion 1-21 and the stepped surface 1-11 are sealed by the sealing ring 8, air can be completely prevented from entering. Since the second screw 9 is used for detachable fixing, it can be disassembled for maintenance or part replacement, and at the same time, the product is very convenient to assemble during production.

[0033] Specifically, the sealing ring 8 can be made of rubber material.

[0034] See Figures 5-7 , wherein, the pressing ring 5 is attached to and fixed to the upper surface of the flange portion 1-21 through an elastic pad 4. In this embodiment, a threaded post 1-213 is fixedly provided on the upper surface of the flange portion 1-21; the threaded post 1-213 sequentially passes through the elastic pad 4 and the pressing ring 5 upward and is locked with a nut 10. Since the threaded post 1-213 and the nut 10 are used for detachable fixing, it can be disassembled for maintenance or part replacement, and at the same time, the product is very convenient to assemble during production. The nut 10 rotates to control the locking degree between the pressing ring 5, the elastic pad 4 and the flange portion 1-21. After unscrewing the nut 10, the pressing ring 5 and the elastic pad 4 can be directly taken out, which is convenient for product assembly and disassembly and maintenance.

[0035] Specifically, the elastic pad 4 is made of rubber material; the pressing ring 5 is made of iron or other hard materials.

[0036] See Figures 5-7 , wherein, a column 1-211 is fixedly provided on the upper surface of the flange portion 1-21; the circuit board 2 is fixedly connected to the upper end of the column 1-211. In this embodiment, there are two columns 1-211; the circuit board 2 and the two columns 1-211 are both fixed by a first screw 7. There is a certain height difference between the circuit board 2 and the flange portion 1-21, which is convenient for heat dissipation and also reduces the temperature interference effect on the smoke detector 3.

[0037] See Figures 5-7 , wherein, the circuit board 2 is located inside the upper housing 1-1, the smoke detector 3 is integrated on the circuit board 2 and is located below it; the housing sleeve 3-1 of the smoke detector 3 is sleeved by the elastic pad 4. Specifically, a central hole 4-1 is provided in the center of the elastic pad 4; the central hole 4-1 is smaller than the outer diameter of the housing sleeve 3-1 of the smoke detector 3 in the normal state, and the central hole 4-1 is elastically expanded and fixedly sleeved on the housing sleeve 3-1 to achieve circumferential mating sealing, which is very stable and reliable.

[0038] See Figures 5-7 , in this embodiment, when in use, the air in the mine enters the lower housing 1-2 through the air inlet hole 1-221 of the lower cylinder part 1-22 of the lower housing 1-2, and then directly contacts the induction end at the lower end of the smoke detector 3. The smoke detector 3 senses the change in the smoke concentration in the air to determine whether a fire has occurred, meeting the normal smoke detection requirements. Since the pressing ring 5 is attached to and fixed to the upper surface of the flange part 1-21 through the elastic pad 4, the circuit board 2 is located in the upper housing 1-1, and the smoke detector 3 is integrated below the circuit board 2; the housing sleeve 3-1 of the smoke detector 3 is sleeved by the elastic pad 4, so that a seal is formed between the housing sleeve 3-1 of the smoke detector 3 and the elastic pad 4. The air in the lower cylinder part 1-22 is prevented from entering the upper housing 1-1 upward to contact the circuit board 2, avoiding bad air from adhering to the circuit board, preventing the circuit board from accumulating dust and getting wet, ensuring the stability of the performance parameters of the circuit board, preventing control failure, extending the service life, and improving safety.

[0039] See Figures 5-7 , and since the pressing ring 5 is attached to and fixed to the upper surface of the flange part 1-21 through the elastic pad 4, and the pressing ring 5 rigidly presses the elastic pad 4, so that the elastic pad 4 can maintain a fitting seal with the upper surface of the flange part 1-21, improving the sealing performance; at the same time, the overall shape of the elastic pad 4 is stabilized and it maintains an outer sleeve sealing state with the housing sleeve 3-1 of the smoke detector 3.

[0040] Preferably, the smoke detector 3 adopts the MQ-2 model and can be purchased from Hanwei Technology Group Co., Ltd. The smoke detector 3 comes with its own housing sleeve 3-1.

[0041] Embodiment 2: This embodiment is a further improvement based on Embodiment 1:

[0042] See Figures 5-7 , a plurality of air inlet holes 1-221 are provided in the circumferential direction of the side wall of the lower cylinder part 1-22; a plurality of ash discharge holes 1-222 are provided on the bottom wall of the lower cylinder part 1-22. The lower cylinder part 1-22 can be shaken or blown with a tool such as an air gun to clean the dust on the inner wall of the lower cylinder part 1-22 or the smoke detector 3 and let it fall off, and then the dust is discharged from the ash discharge holes 1-222, which is very convenient for maintenance and does not affect the electrical components and circuits on the circuit board in the upper housing 1-1.

[0043] Furthermore, see Figure 8, a signal lamp 6 is integrated on the circuit board 2; a lamp cover 1-212 is provided on the flange portion 1-21; the signal lamp 6 extends into the lamp cover 1-212; the lamp cover 1-212 is made of a transparent material. The working state of the smoke sensor can be conveniently observed through the signal lamp 6. Further, there are two signal lamps 6 and two lamp covers 1-212, which are installed in one-to-one correspondence. They can be a red lamp and a green lamp respectively, representing different working states. For example, when the red lamp is on, it means it is already in protection, and when the green lamp is on, it means the power supply is normal.

[0044] Further, a hanging ring 11 is provided at the top end of the upper housing 1-1. It is convenient for the hanging installation of this smoke sensor.

[0045] Further, a waterproof connector 12 is installed on the flange portion 1-21. Cables can pass through the waterproof connector 12 and it can play a role in waterproof sealing.

[0046] Further, a switch button 13 is installed on the flange portion 1-21. The switch button 13 is connected to the circuit board, and the start and stop of the work can be controlled by pressing the switch button 13.

[0047] It can be seen that Figure 5 , when the product of this embodiment is produced, first, the circuit board 2 integrated with the smoke detector 3, the elastic pad 4, the compression ring 5, etc. are fixedly installed on the lower housing 1-2 to obtain the lower housing assembly.

[0048] It can be seen that Figure 5 , and then, the lower housing assembly is assembled and connected to the upper housing 1-1. Among them, the edges of the upper housing 1-1 and the flange portion 1-21 are attached to the step surface 1-11 through a sealing ring 8 and fixed by a second screw 9. Specifically, the screw rod of the second screw 9 passes through the edge of the flange portion 1-21 and the sealing ring 8 and then is connected to the threaded hole 1-12 on the step surface 1-11 (it can be combined with Figure 6 and Figure 5 ).

[0049] This embodiment has simple assembly, good processability, and can achieve full-sealed protection for the circuit board 2.

[0050] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A smoke sensor, characterized in that: It includes a housing (1), a circuit board (2), a smoke detector (3), an elastic pad (4) and a compression ring (5); The housing (1) includes an upper housing (1-1) and a lower housing (1-2); the lower housing (1-2) has a flange portion (1-21) and a lower cylinder portion (1-22), and an air inlet hole (1-221) is provided on the lower cylinder portion (1-22); the edge of the flange portion (1-21) is fixedly connected to the lower end of the upper housing (1-1); The compression ring (5) is attached to and fixed to the upper surface of the flange portion (1-21) through the elastic pad (4); A column (1-211) is provided on the upper surface of the flange portion (1-21); the circuit board (2) is fixedly connected to the upper end of the column (1-211); The circuit board (2) is located inside the upper housing (1-1), and the smoke detector (3) is integrated below the circuit board (2); the housing sleeve (3-1) of the smoke detector (3) is sleeved by the elastic pad (4).

2. The smoke sensor according to claim 1, wherein: The smoke detector (3) adopts the MQ-2 model.

3. A smoke sensor according to claim 1, characterized in that: A signal lamp (6) is integrated on the circuit board (2); a lamp cover (1-212) is provided on the flange portion (1-21); the signal lamp (6) extends into the lamp cover (1-212); the lamp cover (1-212) is made of a transparent material.

4. A smoke sensor according to claim 3, characterized in that: There are two signal lamps (6) and two lamp covers (1-212).

5. A smoke sensor according to claim 1, characterized in that: There are two columns (1-211); the circuit board (2) is fixed to the two columns (1-211) through first screws (7).

6. A smoke sensor according to claim 1, characterized in that: A step surface (1-11) is provided inside the lower end of the upper housing (1-1); the flange portion (1-21) is inserted into the lower end of the upper housing (1-1); the edge of the flange portion (1-21) is attached to the step surface (1-11) through a sealing ring (8) and fixed by a second screw (9).

7. A smoke sensor according to claim 1, characterized in that: A threaded post (1-213) is provided on the upper surface of the flange portion (1-21); the threaded post (1-213) sequentially passes through the elastic pad (4) and the compression ring (5) upward and is locked and fixed by cooperating with a nut (10).

8. The smoke sensor according to claim 1, wherein: A lifting ring (11) is provided at the top of the upper housing (1-1).

9. A smoke sensor according to claim 1, characterized in that: A waterproof joint (12) is installed on the flange portion (1-21).

10. A smoke sensor according to claim 1, characterized in that: A number of air inlet holes (1-221) are provided on the side wall of the lower cylinder portion (1-22); a number of ash discharge holes (1-222) are provided on the bottom wall of the lower cylinder portion (1-22).

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