Printing VOCs waste gas decomposition monitoring device

Abstract

The utility model discloses a printing VOCs waste gas decomposition monitoring device which comprises a waste gas treatment assembly, a gas sensor is arranged on the waste gas treatment assembly, a working part of the gas sensor extends to an inner cavity of the waste gas treatment assembly, a first three-way valve is communicated with a gas inlet of the waste gas treatment assembly, and a second three-way valve is communicated with a gas outlet of the waste gas treatment assembly. A second three-way valve is communicated with an exhaust port of the waste gas treatment assembly, a flow dividing pipe is communicated between connectors of the second three-way valve, and a calibration sensor is arranged in the middle of the flow dividing pipe; the calibration sensor arranged on the shunt pipe can be used as a reference standard, and can be compared with the data of the gas sensor in the inner cavity, so that whether the gas sensor has a measurement error or not can be judged, the measurement accuracy of the gas sensor is ensured, and the reliability of the whole monitoring device is further ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas detection technical field, especially related to a printing VOCs waste gas decomposition monitoring device. BACKGROUND

[0002] VOCs is the abbreviation of volatile organic compounds, is the world after SO2, NOx and freon another focus of attention of waste gas pollution. VOCs refers to volatile hydrocarbons and its derivatives, including hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, esters, amines, organic acids, etc. At room temperature, VOCs evaporation rate is larger, extremely volatile, can cause serious harm to the environment, so the printing workshop is usually equipped with VOCs waste gas treatment device and the corresponding monitoring device for processing VOCs waste gas, and the VOCs concentration in the treated gas is monitored.

[0003] However, the existing VOCs waste gas monitoring device usually only simply uses a gas sensor to determine the concentration of VOCs, in the long-term use process, the oil stains and impurities in the waste gas generated by the printing workshop are easy to adhere to the surface of the sensor, so that the sensor precision is reduced, thereby affecting the detection result, and the existing monitoring device also lacks the corresponding calibration device, and the sensor precision calibration is troublesome.

[0004] Therefore, the present application provides a printing VOCs waste gas decomposition monitoring device, which can periodically automatically calibrate the sensor precision in the monitoring device, improve the accuracy and reliability of the monitoring data. UTILITY MODEL CONTENT

[0005] The utility model provides a printing VOCs waste gas decomposition monitoring device, aims at solving the problem of the above background art.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A printing VOCs waste gas decomposition monitoring device, comprising: a waste gas treatment assembly, a gas sensor is arranged on the waste gas treatment assembly, the working part of the gas sensor extends to the inner cavity of the waste gas treatment assembly, a first three-way valve is communicated at the gas inlet of the waste gas treatment assembly, a second three-way valve is communicated at the exhaust port of the waste gas treatment assembly, a shunt pipe is communicated between the connecting head of the second three-way valve, and a calibration sensor is arranged in the middle part of the shunt pipe.

[0008] Further, the exhaust treatment assembly comprises an adsorption pipe, an inner cavity of the adsorption pipe is provided with a plurality of active carbon plates which are parallel and spaced apart, the active carbon plates are shaped to be matched with the shape of the inner cavity of the adsorption pipe, the gas sensor is located between the active carbon plates and the exhaust port of the adsorption pipe, and the adsorption pipe is provided with a mounting hole for mounting the gas sensor.

[0009] Further, the two ends of the adsorption pipe are provided with connecting pipes, and the inner cavity of the connecting pipe located at the air inlet of the adsorption pipe is provided with a filter screen.

[0010] Further, the gas sensor comprises a mounting pipe fixedly connected with the mounting hole, an inner cavity of the mounting pipe is provided with an extension pipe, an inner cavity of the extension pipe is provided with a data line, and a lower end of the data line is provided with a detection head.

[0011] Further, a locking head is threadedly connected to the lower end of the extension pipe.

[0012] Further, an upper portion of the mounting pipe is provided with a flange, at least one sealing ring is arranged between the flange and an upper surface of the mounting hole, a first sealing glue layer is arranged between an upper portion of the extension pipe and the data line, and a second sealing glue layer is arranged between a lower portion of the mounting pipe and the data line.

[0013] Further, an outer portion of the detection head is sleeved with a protective cover.

[0014] Further, the shunt pipe is communicated with a gas collecting box away from one end of the second three-way valve, and the gas collecting box is communicated with the first three-way valve.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] 1. The printing VOCs exhaust gas decomposition monitoring device can be used as a reference standard through the calibration sensor arranged on the shunt pipe. By comparing the data of the gas sensor in the inner cavity, it can be judged whether the gas sensor has measurement error. If there is deviation between the data of the two, the gas sensor can be calibrated in time to ensure the accuracy of the gas sensor measurement and the reliability of the whole monitoring device.

[0017] 2.The printing VOCs waste gas decomposition monitoring device disclosed by the utility model has the first three-way valve communicated with the air inlet of the waste gas treatment assembly and the second three-way valve communicated with the exhaust port, and has the flexible control ability of the device to the flow direction of waste gas, can change the direction of waste gas according to actual demand through the three-way valve, makes waste gas flow according to a specific path, improves the adaptability and the flexibility of operation of the device, and facilitates the calibration sensor to detect the waste gas flowing through the gas sensor again, thereby guaranteeing the accuracy and reliability of the measurement of the gas sensor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall schematic view of the printing VOCs waste gas decomposition monitoring device disclosed by the utility model;

[0019] Figure 2 is the internal schematic view of the waste gas treatment assembly of the printing VOCs waste gas decomposition monitoring device disclosed by the utility model;

[0020] Figure 3 is the structure schematic view of the gas sensor of the printing VOCs waste gas decomposition monitoring device disclosed by the utility model;

[0021] Figure 4 is the lower end structure schematic view of the gas sensor of the printing VOCs waste gas decomposition monitoring device disclosed by the utility model.

[0022] In the drawings:

[0023] 1, waste gas treatment assembly; 101, adsorption pipe; 102, connecting pipe; 103, filter screen; 104, activated carbon plate; 105, mounting hole;

[0024] 2, gas sensor; 201, mounting pipe; 202, extension pipe; 203, data line; 204, detection head; 205, locking head; 206, first sealing glue layer; 207, second sealing glue layer; 208, sealing ring;

[0025] 3, first three-way valve; 4, second three-way valve; 5, shunt pipe; 6, calibration sensor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described clearly and completely below by combining the specific embodiments of the application and referring to the drawings.

[0027] As Figure 1As shown, a printed VOCs exhaust gas decomposition monitoring device comprises: an exhaust gas treatment assembly 1, a gas sensor 2 is arranged on the exhaust gas treatment assembly 1, the working part of the gas sensor 2 extends to the inner cavity of the exhaust gas treatment assembly 1, a first three-way valve 3 is communicated at the gas inlet of the exhaust gas treatment assembly 1, a second three-way valve 4 is communicated at the exhaust port of the exhaust gas treatment assembly 1, a shunt pipe 5 is communicated between the connecting heads of the second three-way valve 4, and a calibration sensor 6 is arranged in the middle part of the shunt pipe 5.

[0028] The calibration sensor 6 arranged on the shunt pipe 5 can be used as a reference standard, and by comparing the data of the gas sensor 2 in the inner cavity, it can be judged whether the gas sensor 2 has measurement error. If there is deviation between the data of the two, the gas sensor 2 can be calibrated in time to ensure the accuracy of the gas sensor 2 measurement, and then ensure the reliability of the whole monitoring device; through the first three-way valve 3 communicated at the gas inlet of the exhaust gas treatment assembly 1 and the second three-way valve 4 communicated at the exhaust port, the device has the flexibility to control the flow direction of the exhaust gas. According to the actual demand, the flow direction of the exhaust gas can be changed by adjusting the three-way valve, so that the exhaust gas can flow along a specific path, improve the adaptability and flexibility of the device, and facilitate the calibration sensor 6 to detect the exhaust gas flowing through the gas sensor again, thereby ensuring the accuracy and reliability of the gas sensor 2 measurement.

[0029] As shown in Figure 2 The exhaust gas treatment assembly 1 comprises: an adsorption pipe 101, the inner cavity of the adsorption pipe 101 is provided with a plurality of pieces of activated carbon plate 104 arranged in parallel and spaced apart, and the shape of the activated carbon plate 104 is matched with the shape of the inner cavity of the adsorption pipe 101; the gas sensor 2 is located between the activated carbon plate 104 and the exhaust port of the adsorption pipe 101, and the adsorption pipe 101 is provided with a mounting hole 105 for mounting the gas sensor 2.

[0030] The inner cavity of the adsorption pipe 101 is provided with a plurality of pieces of activated carbon plate 104 arranged in parallel and spaced apart, and the shape of the activated carbon plate 104 is matched with the shape of the inner cavity of the adsorption pipe 101, which greatly increases the contact area and contact time of the exhaust gas and the activated carbon plate 104. Activated carbon has a rich pore structure and good adsorption performance for VOCs. When the exhaust gas passes through the adsorption pipe 101, it needs to pass through a plurality of activated carbon plates 104 in turn, so that the VOCs in it can be more fully adsorbed by the activated carbon, thereby effectively reducing the concentration of VOCs in the exhaust gas and improving the exhaust gas treatment efficiency and purification effect.

[0031] The gas sensor 2 is located between the activated carbon plate 104 and the exhaust port of the adsorption pipe 101, and can monitor the concentration of VOCs in the exhaust gas treated by the activated carbon plate 104 in real time and accurately. In this way, the final effect of the exhaust gas treatment can be obtained in time, and a direct basis for judging whether the exhaust gas meets the emission standard is provided. Once the concentration of VOCs in the exhaust gas is monitored to be abnormal, measures can be taken in time, such as replacing the activated carbon plate, adjusting the exhaust gas treatment parameters, etc. The mounting hole 105 for mounting the gas sensor 2 is arranged on the adsorption pipe 104, which facilitates the installation of the gas sensor 2. The installation process is simple and convenient, and it is also convenient for later maintenance operations such as repair and replacement of the gas sensor, thereby reducing the maintenance cost and difficulty.

[0032] As shown in Figure 2 , the adsorption pipe 101 is provided with a connecting pipe 102 at both ends, and the inner cavity of the connecting pipe 102 located at the gas inlet of the adsorption pipe 101 is provided with a filter screen 103.

[0033] The filter screen 103 arranged in the inner cavity of the connecting pipe 102 located at the gas inlet of the adsorption pipe 101 can preliminarily filter the exhaust gas entering the adsorption pipe. The exhaust gas generated during the printing process may carry some impurities and particulate matters (such as dust, paper scraps, etc.). If these impurities and particulate matters directly enter the adsorption pipe 101, they may block the pores of the activated carbon plate 104, reduce the adsorption performance of the activated carbon, and shorten the service life of the activated carbon. The filter screen 103 can effectively intercept these impurities and particulate matters, ensure that the exhaust gas entering the adsorption pipe is relatively clean, and improve the adsorption efficiency and service life of the activated carbon plate.

[0034] As shown in Figures 3-4 , the gas sensor 2 comprises a mounting pipe 201 fixedly connected with the mounting hole 105, an extension pipe 202 arranged in the inner cavity of the mounting pipe 201, a data line 203 arranged in the inner cavity of the extension pipe 202, and a detection head 204 arranged at the lower end of the data line 203. By arranging the extension pipe 202, the position of the detection head 204 can be adjusted to be located in the middle of the pipeline, so that the detection data of the gas sensor 2 is more accurate. In a specific embodiment, the mounting pipe 201 is threadedly connected with the mounting hole 105, a hexagonal nut seat is arranged at the upper part of the mounting pipe 201, the upper part of the extension pipe 202 is threadedly connected with the mounting pipe 202, and different lengths of the extension pipe 202 can be replaced according to the diameter of the adsorption pipe 101, so that the detection head 204 is located in the middle of the adsorption pipe 101 as much as possible, thereby obtaining more accurate measurement data.

[0035] As shown in Figure 4 , a locking head 205 is threadedly connected with the lower end of the extension pipe 202. The locking head 205 is used for locking the lower end of the extension pipe 202, and improving the air tightness of the extension pipe 202.

[0036] AsFigure 3 As shown, the upper portion of the mounting pipe 201 is provided with a flange, and at least one ring of sealing ring 208 is arranged between the upper surface of the mounting hole 105 and the flange. The upper portion of the extension pipe 202 and the data line 203 are provided with a first sealing glue layer 206. The lower portion of the mounting pipe 201 and the data line 203 are provided with a second sealing glue layer 207. Through the arrangement of several sealing glue layers and sealing rings, the leakage of waste gas in the inner cavity of the adsorption pipe 101 can be effectively avoided.

[0037] As shown in the figure, the outer portion of the detection head 204 is sleeved with a protective cover. Figure 4

[0038] In a specific embodiment, the shunt pipe 5 is communicated with a gas collecting box at one end away from the second three-way valve 4, and the gas collecting box is communicated with the first three-way valve 3.

[0039] The shunted waste gas enters the gas collecting box and then returns to the gas inlet of the waste gas treatment assembly through the first three-way valve 3, realizing the cyclic treatment of the waste gas. The waste gas that has been preliminarily treated but may still not meet the standard enters the adsorption pipe 101 again, so that the remaining VOCs therein have more opportunities to be adsorbed by the activated carbon plate, further reducing the VOCs content in the waste gas, improving the overall waste gas treatment efficiency, and making the finally discharged waste gas more likely to meet the environmental protection standard. Preferably, a corresponding gas pump assembly is arranged on the pipeline communicated with the first three-way valve 3, for providing power to the waste gas in the gas collecting box.

[0040] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.​

Claims

1. A printed VOCs exhaust gas decomposition monitoring device, characterized by, Include: Exhaust treatment assembly (1), which is provided with a gas sensor (2), the working part of the gas sensor (2) extends to the inner cavity of the exhaust treatment assembly (1), the gas inlet of the exhaust treatment assembly (1) is communicated with the first three-way valve (3), the exhaust port of the exhaust treatment assembly (1) is communicated with the second three-way valve (4), the connecting head of the second three-way valve (4) is communicated with the shunt pipe (5), the middle part of the shunt pipe (5) is provided with a calibration sensor (6).

2. The printed VOCs exhaust gas decomposition monitoring device according to claim 1, characterized in that, The exhaust treatment assembly (1) comprises: an adsorption pipe (101), the inner cavity of the adsorption pipe (101) is provided with a plurality of pieces of parallel and spaced activated carbon plates (104), the shape of the activated carbon plate (104) is matched with the shape of the inner cavity of the adsorption pipe (101); the gas sensor (2) is located between the activated carbon plate (104) and the exhaust port of the adsorption pipe (101), and the adsorption pipe (101) is provided with a mounting hole (105) for mounting the gas sensor (2).

3. The printed VOCs exhaust gas decomposition monitoring device of claim 2, wherein, The both ends of the adsorption pipe (101) are provided with connecting pipes (102), and the inner cavity of the connecting pipe (102) located at the gas inlet of the adsorption pipe (101) is provided with a filter screen (103).

4. The printed VOCs exhaust gas decomposition monitoring device of claim 2, wherein, The gas sensor (2) comprises: an installation pipe (201) fixedly connected with the mounting hole (105), the inner cavity of the installation pipe (201) is provided with an extension pipe (202), the inner cavity of the extension pipe (202) is provided with a data line (203), and the lower end of the data line (203) is provided with a detection head (204).

5. The printed VOCs exhaust gas decomposition monitoring device of claim 4, wherein, The lower end of the extension pipe (202) is threadedly connected with a locking head (205).

6. The printed VOCs exhaust gas decomposition monitoring device of claim 5, wherein, The upper part of the installation pipe (201) is provided with a flange, at least one ring of sealing ring (208) is arranged between the flange and the upper surface of the mounting hole (105), the first sealing glue layer (206) is arranged between the upper part of the extension pipe (202) and the data line (203), and the second sealing glue layer (207) is arranged between the lower part of the installation pipe (201) and the data line (203).

7. The printed VOCs exhaust gas decomposition monitoring device of claim 6, wherein, The outer part of the detection head (204) is sleeved with a protective cover.

8. The printed VOCs exhaust gas decomposition monitoring device of claim 1, wherein, The end of the shunt pipe (5) away from the second three-way valve (4) is communicated with a gas collecting box, and the gas collecting box is communicated with the first three-way valve (3).

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