Miniature air pump for VOC (volatile organic compound) online detection

Abstract

The utility model discloses a miniature air pump for VOC on-line detection, relates to the technical field of VOC detection equipment, and aims to solve the technical problem that the service life of an existing VOC on-line detection pump is shortened during working, the miniature air pump comprises a pump unit and a driving unit, the pump unit comprises a pump body, a pump assembly and a rear cover, and the pump assembly comprises a diaphragm, a valve lower plate, a valve body and a valve upper plate; the driving unit comprises a brushless motor, an eccentric wheel and a transmission rod. The brushless motor is adopted, the requirement for the service life of 24-hour continuous long-term work is met, the upper end of the transmission rod is connected with the center hole of the diaphragm through the long connecting rod, the swing angle is reduced, then the service life of the diaphragm is prolonged, and work for overcoming diaphragm deformation is reduced; a bearing is arranged at the rear end of the pump and used for sharing the stress condition of the motor shaft so as to prolong the service life of the brushless motor; the rib structure is arranged on the diaphragm, so that the strength of the diaphragm is enhanced, the consumption of the pump is reduced, and the pump can work normally at low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of VOC detection equipment, and more specifically to a micro air pump used for VOC online detection. Background Art

[0002] VOC is a volatile organic compound, a compound with a boiling point of 50℃-250℃, a saturated vapor pressure of more than 133.32KPa at room temperature, and a type of organic matter that exists in the air in the form of vapor at room temperature. VOCs are mainly emitted outdoors from fuel combustion and transportation; indoors from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, emissions from building and decoration materials, furniture, household appliances, detergents, and human bodies. Therefore, the significance and role of VOC detection are very important.

[0003] However, in the prior art, VOC online detection requires the pump to work continuously for 24 hours, and generally requires the pump life to reach 3-5 years, and its working environment is complex and changeable. Therefore, there are high requirements for the service life and protection level of the pump. In view of this, we propose a method for a micro air pump for VOC online detection. Utility Model Content

[0004] The utility model aims to provide a micro air pump for VOC online detection, so as to solve the technical problem that the existing VOC online detection pump has a shortened service life.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a micro air pump for VOC online detection, comprising a pump unit and a drive unit, wherein the pump unit comprises a pump body, a pump assembly and a back cover, wherein the pump assembly comprises a diaphragm, a valve lower plate, a valve body and a valve upper plate, wherein the valve lower plate presses the diaphragm onto the gas channel of the pump body, and a rib is arranged on the lower surface of the diaphragm; the valve upper plate presses the valve body onto the valve lower plate, and the back cover is connected to the rear end of the housing of the pump body;

[0006] The driving unit includes a brushless motor, an eccentric wheel and a transmission rod; the brushless motor is assembled at the front end of the outer shell of the pump body, and the driving shaft of the brushless motor extends into the interior of the pump body; the eccentric wheel is arranged inside the pump body and connected to the driving shaft of the brushless motor; the transmission rod is arranged inside the pump body, the center hole of the transmission rod is connected to the wheel axle of the eccentric wheel, and the upper end of the transmission rod is connected to the center hole of the diaphragm through a long connecting rod; a bearing is provided at the rear end of the rear cover, and the inner hole of the bearing is connected to the end of the driving shaft of the brushless motor.

[0007] The utility model adopts a brushless motor to meet the requirement of life for 24 hours of continuous long-term work. The upper end of the transmission rod is connected to the central hole of the diaphragm through a long connecting rod. By increasing the length of the connecting rod, the swing angle is reduced, thereby extending the service life of the diaphragm, so that when the pump is working, the work to overcome the deformation of the diaphragm is reduced; by arranging a bearing at the rear end of the pump, the bearing can share the stress of the motor shaft to extend the service life of the brushless motor; by arranging a rib structure on the diaphragm, the strength of the diaphragm itself is strengthened, and the self-consumption of the pump is reduced, which is beneficial for the pump to ensure normal operation even at low temperatures.

[0008] Preferably, the valve upper plate and the valve lower plate are connected to the housing of the pump body via screws.

[0009] Preferably, a sealing ring is connected between the brushless motor and the outer shell of the pump body.

[0010] Preferably, the rear end of the rear cover is also connected to a dustproof cover.

[0011] Preferably, the dustproof cover is connected to the rear cover by screws.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model adopts a brushless motor to meet the requirement of life for 24 hours of continuous long-term work. The upper end of the transmission rod is connected to the central hole of the diaphragm through a long connecting rod. By increasing the length of the connecting rod, the swing angle is reduced, thereby extending the service life of the diaphragm, so that when the pump is working, the work to overcome the deformation of the diaphragm is reduced; by arranging a bearing at the rear end of the pump, the bearing can share the stress of the motor shaft to extend the service life of the brushless motor; by arranging a rib structure on the diaphragm, the strength of the diaphragm itself is strengthened, and the self-consumption of the pump is reduced, which is beneficial for the pump to ensure normal operation even at low temperatures.

[0014] A sealing ring is provided between the brushless motor and the pump body, and a dustproof cover is provided at the rear end of the rear cover to improve the protection capability of the pump, so that the pump can work normally in some relatively humid or dusty places. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an embodiment of a micro air pump for VOC online detection according to the utility model;

[0016] Figure 2 It is a perspective structural diagram of the micro air pump of the utility model;

[0017] Figure 3 It is a side view structural schematic diagram of the diaphragm of the utility model;

[0018] Figure 4It is a bottom view structural schematic diagram of the diaphragm of the utility model.

[0019] Description of the numbers in the figure:

[0020] 1. Pump body; 2. Pump assembly; 21. Diaphragm; 22. Valve lower plate; 23. Valve body; 24. Valve upper plate; 3. Back cover; 4. Brushless motor; 5. Eccentric wheel; 6. Transmission rod; 7. Bearing; 8. Sealing ring; 9. Dustproof cover. DETAILED DESCRIPTION

[0021] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0022] like Figure 1-Figure 4 As shown, the utility model relates to a micro air pump for VOC online detection, comprising a pump unit and a drive unit; wherein the pump unit comprises a pump body 1, a pump assembly 2 and a back cover 3, wherein the pump assembly 2 comprises a diaphragm 21, a valve lower plate 22, a valve body 23 and a valve upper plate 24, the valve lower plate 22 presses the diaphragm 21 on the gas channel of the pump body 1, and a rib is arranged on the lower surface of the diaphragm 21; the valve upper plate 24 presses the valve body 23 on the valve lower plate 22, and the back cover 3 is connected to the rear end of the shell of the pump body 1;

[0023] The driving unit includes a brushless motor 4, an eccentric wheel 5 and a transmission rod 6; the brushless motor 4 is assembled at the front end of the housing of the pump body 1, and the driving shaft of the brushless motor 4 extends into the pump body 1; the eccentric wheel 5 is arranged inside the pump body 1 and connected to the driving shaft of the brushless motor 4; the transmission rod 6 is arranged inside the pump body 1, the center hole of the transmission rod 6 is connected to the wheel axle of the eccentric wheel 5, and the upper end of the transmission rod 6 is connected to the center hole of the diaphragm 21 through a long connecting rod;

[0024] A bearing 7 is provided at the rear end of the rear cover 3 , and an inner hole of the bearing 7 is connected to the end of the driving shaft of the brushless motor 4 .

[0025] like Figure 1 As shown, in the embodiment of the present utility model, the valve upper plate 24 and the valve lower plate 22 are connected to the housing of the pump body 1 by screws.

[0026] like Figure 1 As shown, in the embodiment of the present utility model, a sealing ring 8 is connected between the brushless motor 4 and the outer shell of the pump body 1 .

[0027] As another embodiment of the present invention, Figure 1 The rear end of the rear cover 3 is also connected to a dust cover 9, which is connected to the rear cover 3 by screws. By arranging a sealing ring 8 between the brushless motor 4 and the pump body 1 and arranging a dust cover 9 at the rear end of the rear cover 3, the protection capability of the pump is improved, and the pump can work normally in some relatively humid or dusty places.

[0028] The utility model adopts a brushless motor 4 to meet the requirement of life for 24 hours of continuous long-term work. The upper end of the transmission rod 6 is connected to the central hole of the diaphragm 21 through a long connecting rod. By increasing the length of the connecting rod, the swing angle is reduced, thereby extending the service life of the diaphragm 21, so that when the pump is working, the work to overcome the deformation of the diaphragm 21 is reduced; by arranging a bearing 7 at the rear end of the pump, the bearing 7 can share the stress of the motor shaft to extend the service life of the brushless motor 4; by arranging a rib structure on the diaphragm 21, the strength of the diaphragm 21 itself is strengthened, and the self-consumption of the pump is reduced, which is beneficial for the pump to ensure normal operation even at low temperatures.

[0029] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A micro air pump for VOC online detection, comprising a pump unit and a drive unit, characterized in that: The pump unit comprises a pump body (1), a pump assembly (2) and a rear cover (3), wherein the pump assembly (2) comprises a diaphragm (21), a valve lower plate (22), a valve body (23) and a valve upper plate (24), the valve lower plate (22) presses the diaphragm (21) onto the gas passage of the pump body (1), and a rib is provided on the lower surface of the diaphragm (21); the valve upper plate (24) presses the valve body (23) onto the valve lower plate (22), and the rear cover (3) is connected to the rear end of the housing of the pump body (1); The drive unit comprises a brushless motor (4), an eccentric wheel (5) and a transmission rod (6); the brushless motor (4) is mounted on the front end of the housing of the pump body (1), and the drive shaft of the brushless motor (4) extends into the pump body (1); the eccentric wheel (5) is arranged inside the pump body (1) and connected to the drive shaft of the brushless motor (4); the transmission rod (6) is arranged inside the pump body (1), the center hole of the transmission rod (6) is connected to the wheel axle of the eccentric wheel (5), and the upper end of the transmission rod (6) is connected to the center hole of the diaphragm (21) via a long connecting rod; A bearing (7) is provided at the rear end of the rear cover (3), and an inner hole of the bearing (7) is connected to the end of the drive shaft of the brushless motor (4).

2. The micro air pump for VOC online detection according to claim 1, characterized in that: The valve upper plate (24) and the valve lower plate (22) are connected to the housing of the pump body (1) via screws.

3. The micro air pump for VOC online detection according to claim 1, characterized in that: A sealing ring (8) is connected between the brushless motor (4) and the outer shell of the pump body (1).

4. The micro air pump for VOC online detection according to claim 1, characterized in that: The rear end of the rear cover (3) is also connected to a dustproof cover (9).

5. The micro air pump for VOC online detection according to claim 4 is characterized in that: The dustproof cover (9) is connected to the rear cover (3) via screws.

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