An on-line monitoring device for NMP concentration

Abstract

The utility model discloses a kind of online monitoring devices of NMP concentration, the utility model relates to NMP monitoring technical field, including NMP gas detector, the bottom of the NMP gas detector integrally formed has air inlet pipe;The bottom of the air inlet pipe is fixedly connected with bearing one, and bearing one is rotatably connected with connecting pipe, the connecting pipe and air inlet pipe are mutually penetrated, by setting funnel type filter screen, so that water droplet condensed thereon can flow downwards and converge by gravity, and then to facilitate automatically along the bottom end of funnel type filter screen falls, can reduce the moisture condensed on funnel type filter screen, so that the opening number of motor can be reduced, and when water droplet is difficult to converge and flow away due to being covered with dust outside blocking funnel type filter screen, funnel type filter screen can be driven to high-speed rotation by driving assembly, so as to facilitate the moisture on funnel type filter screen by centrifugal force to be thrown, compared with the mode of knocking, can avoid the damage deformation of filter screen knocking place.

Description

Technical Field

[0001] This utility model relates to the field of NMP monitoring technology, specifically to an online monitoring device for NMP concentration. Background Technology

[0002] NMP (N-methylpyrrolidone) is a colorless, transparent, oily liquid with a slight amine odor. It is miscible with water, alcohols, and ethers, exhibits low volatility, good thermal and chemical stability, and can evaporate with water vapor. As a key auxiliary material in lithium-ion battery manufacturing, NMP is harmful to human health, particularly from the electrolyte solution. The electrolyte is a volatile organic liquid with significant corrosive properties; prolonged inhalation of the volatile gas can damage the respiratory tract. Therefore, for safety reasons, online NMP concentration monitoring devices must be installed in lithium battery production workshops or charging rooms to conduct comprehensive real-time monitoring of NMP gas.

[0003] Current online NMP concentration monitoring devices are installed around the leak source in the field environment, typically requiring multiple devices. The monitoring principle involves a gas detector detecting the NMP gas concentration in the air. When the concentration reaches a set safe level, it triggers an alarm on the gas detector, emitting a real-time alarm signal. Simultaneously, it transmits real-time monitoring data and alarm status to the safety control center via a wireless module. Staff can view the concentration display on computer monitoring software, prompting them to take appropriate measures. A search revealed that authorization announcement number CN219657587U discloses a waterproof structure for an NMP gas sensor, which mentions... NMP gas comes into contact with the sensing element of a gas sensor along with moisture in the air. The sensing element has a filter through which the NMP gas passes to filter out airborne debris. However, when the moisture carried by the NMP gas passes through the filter of the sensing element, the moisture condenses on the filter and can easily block the mesh openings, preventing the subsequent sensing element from contacting the NMP gas. As a result, the NMP gas sensor cannot sense the subsequent gas. If the NMP gas concentration increases at this time, the sensor will not be able to detect it, which will prevent people in the vicinity from knowing the accurate concentration of NMP gas and pose a huge safety hazard to their health.

[0004] In the existing device, the control motor operates, driving the drive gear to rotate. The drive gear meshes with the toothed grooves on the inner wall of the support ring, causing the support ring to rotate. The support ring then drives the support rod to rotate, which in turn drives the torsion spring rod to rotate. The torsion spring rod rotates and slides at the top of the guide ring. When the torsion spring rod rotates onto the protrusion of the guide ring, the protrusion pushes the torsion spring rod upward, causing it to flip downward along the protrusion. The torsion spring rod then strikes the filter screen downward, shaking off the condensed water and preventing moisture from evaporating. After condensation, the mesh of the filter screen is sealed to prevent subsequent NMP gas from being blocked by the water curtain and unable to contact the sensing element. This allows the sensor to accurately detect the concentration of surrounding NMP gas, enabling nearby personnel to receive timely and accurate detection information. Existing technology essentially uses a tapping structure to knock off the condensed water on the filter screen. However, long-term tapping of the filter screen can easily cause accelerated damage and deformation at the tapped areas. Moreover, the horizontally set filter screen makes it difficult for the condensed water droplets at the bottom to fall off, thus requiring the drive motor to be turned on at high frequency for tapping. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an online monitoring device for NMP concentration, which solves the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an online monitoring device for NMP concentration, comprising an NMP gas detector, wherein an air inlet pipe is integrally formed at the bottom of the NMP gas detector; a bearing is fixedly connected to the bottom of the air inlet pipe, and the bearing is rotatably connected to a connecting pipe, the connecting pipe and the air inlet pipe are interconnected, a funnel-shaped filter screen is detachably connected to the bottom of the connecting pipe, the outer side of the funnel-shaped filter screen is in contact with a brush assembly, and a drive assembly for rotating the connecting pipe is also provided on the air inlet pipe.

[0007] Preferably, the brush assembly includes a brush that contacts the funnel-shaped filter screen. The brush is detachably connected to a round rod. A positioning groove is provided at the top of the round rod. The round rod is rotatably connected to a bearing, and the bearing is fixedly connected to the bottom end of the funnel-shaped filter screen. A positioning rod is inserted into the positioning groove and is fixedly connected to the bottom of the air intake pipe.

[0008] Preferably, the brush assembly further includes a retaining ring and a retaining sleeve, with the upper and lower sides of the brush contacting the retaining ring and the retaining sleeve respectively. The retaining ring is integrally formed on a round rod located below the funnel-shaped filter screen, and the retaining sleeve is threaded to the bottom of the round rod.

[0009] Preferably, the drive assembly includes a motor detachably connected to the intake pipe, the output shaft of the motor is connected to a gear, and a gear ring fixedly connected to the outside of the connecting pipe is meshed on the gear.

[0010] Preferably, the motor is provided with a mounting base, and the mounting base is fixedly connected to the air intake pipe by screws.

[0011] Preferably, both the funnel-shaped filter screen and the connecting pipe are provided with raised rings, and bolts are evenly arranged between the raised rings on both sides.

[0012] This invention provides an online monitoring device for NMP concentration. Compared with the prior art, it has the following advantages:

[0013] 1. This online NMP concentration monitoring device uses a funnel-shaped filter screen. Water droplets condensing on the screen can flow downwards under gravity and collect, automatically falling down the bottom of the screen. This reduces the amount of water condensed on the screen, thus reducing the frequency of motor operation. Furthermore, if the outside of the funnel-shaped filter screen is covered in dust, making it difficult for water droplets to collect and flow away, the drive assembly can rotate the screen at high speed, using centrifugal force to shake off the water. Compared to tapping, this method avoids damage and deformation to the filter screen.

[0014] 2. In this online NMP concentration monitoring device, during each high-speed rotation of the funnel-shaped filter, the top of the round rod is inserted into the positioning rod through the positioning groove, and the height of the round rod is fixed by the bearing. Therefore, the round rod cannot rotate, which allows the brush to be fixed in place. This allows the dust on the outside of the rotating funnel-shaped filter to be brushed off by the brush. When moisture condenses again, the funnel-shaped filter can easily collect and drain the moisture, thereby further reducing the number of times the motor is turned on. In addition, the brush is mounted on the round rod, so that the brush can be removed together when disassembling the funnel-shaped filter without obstructing the funnel-shaped filter. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of a partial structure of this utility model;

[0017] Figure 3 This is an exploded view of a partial structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the brush assembly of this utility model.

[0019] In the diagram: 1. NMP gas detector; 2. Inlet pipe; 3. Bearing 1; 4. Connecting pipe; 5. Funnel-shaped filter screen; 6. Brush assembly; 61. Brush; 62. Round rod; 63. Positioning groove; 64. Bearing 2; 65. Retaining ring; 66. Retaining sleeve; 7. Drive assembly; 71. Motor; 72. Gear; 73. Gear ring; 8. Positioning rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] See Figures 1-4 This utility model provides the following three technical solutions:

[0022] First implementation: An online monitoring device for NMP concentration includes an NMP gas detector 1, an external power supply cable for the NMP gas detector 1, and an integrally formed air inlet pipe 2 at the bottom of the NMP gas detector 1. Gas enters the NMP gas detector 1 through the air inlet pipe 2 to detect the NMP concentration in the gas.

[0023] A bearing 3 is fixedly connected to the bottom of the intake pipe 2, and the bearing 3 is rotatably connected to the connecting pipe 4. The connecting pipe 4 and the intake pipe 2 are interconnected. A funnel-shaped filter screen 5 is detachably connected to the bottom of the connecting pipe 4. After dust and impurities in the gas are filtered, they pass through the connecting pipe 4 and the bearing 3 before entering the intake pipe 2. The funnel-shaped filter screen 5 allows water droplets to condense and flow downwards under gravity, resulting in better water collection compared to a horizontally set filter screen. The collected water then automatically falls down along the bottom of the funnel-shaped filter screen 5, reducing the amount of water condensed on it and thus reducing the frequency of motor 71 operation. The outer surface of the funnel-shaped filter screen 5... The funnel-shaped filter 5 is in contact with the brush assembly 6 on the side. The air inlet pipe 2 is also equipped with a drive assembly 7 for rotating the connecting pipe 4. When the funnel-shaped filter 5 is covered with dust on the outside due to filtration, it will make it difficult for water to flow and collect. Then, the drive assembly 7 drives the connecting pipe 4 to rotate, so that the funnel-shaped filter 5 rotates at high speed, so that the water on the funnel-shaped filter 5 can be thrown off by centrifugal force. Compared with the knocking method, it can avoid damage and deformation of the filter screen at the knocking point. The rotating funnel-shaped filter 5 contacts the brush assembly 6, so that the dust on the outside can be brushed off by the brush assembly 6. When water condenses again later, the funnel-shaped filter 5 can easily collect and discharge the water, thereby further reducing the number of times the motor 71 is turned on.

[0024] After testing the frequency at which the outside of the funnel-shaped filter screen 5 becomes covered with dust, the opening interval of the motor 71 can be set according to this frequency.

[0025] The drive assembly 7 includes a motor 71 detachably connected to the intake pipe 2. The output shaft of the motor 71 is connected to a gear 72. A gear ring 73 is meshed on the gear 72 and fixedly connected to the outside of the connecting pipe 4. The motor 71 drives the gear 72 to rotate, so that the gear ring 73 drives the connecting pipe 4 to rotate on the bearing 3.

[0026] The motor 71 is provided with a mounting base, and the mounting base is fixedly connected to the air intake pipe 2 by screws, making it easy to install and remove the motor 71 from the air intake pipe 2.

[0027] Both the funnel-shaped filter screen 5 and the connecting pipe 4 are provided with raised rings, and bolts are evenly arranged between the raised rings on both sides, so that the funnel-shaped filter screen 5 and the connecting pipe 4 can be disassembled and assembled by bolts.

[0028] The second embodiment differs from the first embodiment in that the brush assembly 6 includes a brush 61 that contacts the funnel-shaped filter screen 5. The brush 61 is detachably connected to a round rod 62. A positioning groove 63 is provided at the top of the round rod 62. The round rod 62 is rotatably connected to a bearing 64, and the bearing 64 is fixedly connected to the bottom end of the funnel-shaped filter screen 5. A positioning rod 8 is inserted into the positioning groove 63 and is fixedly connected to the bottom of the air inlet pipe 2. When the funnel-shaped filter screen 5 rotates, the height of the round rod 62 is fixed by the bearing 64, and the positioning groove 63 and the positioning rod 8 prevent the round rod 62 from rotating. The funnel-shaped filter screen 5 rotates outside the round rod 62 with the help of the bearing 64, so that the dust on the outside can be brushed off by the fixed brush 61. The reason for this arrangement is that when the funnel-shaped filter screen 5 needs to be disassembled and installed on the connecting pipe 4, the brush assembly 6 is disassembled and installed accordingly without obstructing the funnel-shaped filter screen 5.

[0029] The third embodiment differs from the second embodiment in that the brush assembly 6 further includes a retaining ring 65 and a retaining sleeve 66. The upper and lower sides of the brush 61 are in contact with the retaining ring 65 and the retaining sleeve 66, respectively. The retaining ring 65 is integrally formed on the round rod 62 located below the funnel-shaped filter screen 5. The retaining sleeve 66 is threaded to the bottom of the round rod 62. The brush 61 is fixed by the retaining ring 65 and the retaining sleeve 66. When it is necessary to remove the brush 61 separately, the retaining sleeve 66 is removed, and the brush 61 can be taken out by going down along the round rod 62.

[0030] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online monitoring device for NMP concentration, characterized in that: Includes an NMP gas detector (1), the bottom of which is integrally formed with an air inlet pipe (2); The bottom of the air intake pipe (2) is fixedly connected to a bearing (3), and the bearing (3) is rotatably connected to the connecting pipe (4). The connecting pipe (4) and the air intake pipe (2) are interconnected. The bottom of the connecting pipe (4) is detachably connected to a funnel-shaped filter screen (5). The outer side of the funnel-shaped filter screen (5) is in contact with the brush assembly (6). The air intake pipe (2) is also provided with a drive assembly (7) for rotating the connecting pipe (4).

2. The online monitoring device for NMP concentration according to claim 1, characterized in that: The brush assembly (6) includes a brush (61) that contacts the funnel-shaped filter screen (5). The brush (61) is detachably connected to a round rod (62). A positioning groove (63) is provided at the top of the round rod (62). The round rod (62) is rotatably connected to a bearing (64), and the bearing (64) is fixedly connected to the bottom end of the funnel-shaped filter screen (5). A positioning rod (8) is inserted into the positioning groove (63), and the positioning rod (8) is fixedly connected to the bottom of the air inlet pipe (2).

3. The online monitoring device for NMP concentration according to claim 2, characterized in that: The brush assembly (6) also includes a retaining ring (65) and a retaining sleeve (66). The upper and lower sides of the brush (61) are in contact with the retaining ring (65) and the retaining sleeve (66) respectively. The retaining ring (65) is integrally formed on the round rod (62) located below the funnel-shaped filter screen (5). The retaining sleeve (66) is threaded to the bottom of the round rod (62).

4. The online monitoring device for NMP concentration according to claim 1, characterized in that: The drive assembly (7) includes a motor (71) detachably connected to the intake pipe (2), the output shaft of the motor (71) is connected to a gear (72), and a gear ring (73) fixedly connected to the outside of the connecting pipe (4) is meshed on the gear (72).

5. The online monitoring device for NMP concentration according to claim 4, characterized in that: The motor (71) is provided with a mounting base, and the mounting base is fixedly connected to the air intake pipe (2) by screws.

6. The online monitoring device for NMP concentration according to claim 1, characterized in that: Both the funnel-shaped filter screen (5) and the connecting pipe (4) are provided with raised rings, and bolts are evenly arranged between the raised rings on both sides.

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