Cleaning device and cleaning method

Abstract

The present application relates to the technical field of article cleaning, in particular to a cleaning device and a cleaning method, wherein the cleaning device comprises a suction pump and a pipeline, the pipeline has a suction pump connecting port, a cleaning article connecting port and a nitrogen inlet, the suction pump connecting port, the cleaning article connecting port and the nitrogen inlet extend to the inside of the pipeline to form a confluence area, the pipeline is provided with a first valve for controlling the on-off connection between the suction pump connecting port and the confluence area and a second valve for controlling the on-off connection between the nitrogen inlet and the confluence area, a water storage container is arranged on the nitrogen inlet through a first connecting pipe, a third valve is arranged on the first connecting pipe, the water storage container has a water-nitrogen mixed gas outlet, the pipeline has a water-nitrogen mixed gas inlet and an organic solvent steam inlet, the water-nitrogen mixed gas outlet and the water-nitrogen mixed gas inlet are connected through a second connecting pipe, a fourth valve is arranged on the second connecting pipe, and the organic solvent steam inlet is connected with an organic solvent container. The present application realizes the cleaning of the articles to be cleaned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of article cleaning, in particular to a cleaning device and a cleaning method. BACKGROUND

[0002] The atmospheric pre-concentrator is an important equipment in the environmental protection industry, which can effectively compress and process volatile organic compounds (VOCs) and other organic waste gas. The atmospheric pre-concentrator can sample and low-temperature concentrate air samples in various sampling containers such as canisters, sampling bags and sampling bottles, and can effectively concentrate and analyze polar, non-polar, active sulfur and nitrogen compounds and other organic compounds in the air samples, and effectively remove H2O, O2, CO2, N2 and other gases in the gas samples. It is connected with a gas chromatograph or a GC-MS instrument for use, to realize the analysis of volatile organic compounds in air samples.

[0003] In order to transport the air sample in the sampling container into the atmospheric pre-concentrator, an automatic sampler is usually connected to the inlet of the atmospheric pre-concentrator, for example, a 16-bit automatic sampler with 16 sample inlets and 1 sample outlet. The sample inlets are used to connect the sampling containers, and the sample outlet is used to connect the atmospheric pre-concentrator. The sample inlets and the sampling containers, and the sample outlet and the atmospheric pre-concentrator are connected by pipelines. Although the inner surface of the pipeline is inertly coated to reduce the adsorption of VOCs in the gas sample by the pipeline and improve the accuracy of the detection result of the gas sample, the adsorption of VOCs by the pipeline cannot be completely eliminated, that is, a small amount of VOCs (including aldehyde ketone substances and high-boiling point substances) will remain in the pipeline after use. Therefore, after the pipeline is used, the pipeline needs to be cleaned to remove the residual VOCs, so as to avoid affecting the detection result of the air sample in subsequent use. In addition, aerosols, particles and other impurities may exist in the pipeline, which also need to be removed. SUMMARY

[0004] The purpose of the present application is to provide a cleaning device and a cleaning method for cleaning aerosols, particles and VOCs remaining in the interior of the article to be cleaned.

[0005] To achieve the above object, in a first aspect, a cleaning device is provided, comprising a suction pump and a pipeline, the pipeline having a suction pump connection port connected with a suction port of the suction pump, a cleaning object connection port for connecting with an object to be cleaned, and a nitrogen inlet port for nitrogen to enter, the suction pump connection port, the cleaning object connection port and the nitrogen inlet port extending into the pipeline to form a junction area, a pressure sensor being arranged on the pipeline at a position directly communicating with the junction area, a first valve being arranged on the pipeline to control the opening and closing of the suction pump connection port and the junction area, a second valve being arranged on the pipeline to control the opening and closing of the nitrogen inlet port and the junction area, a water storage container being arranged on the first connecting pipe through the nitrogen inlet port for storing water, a third valve being arranged on the first connecting pipe to control the opening and closing of the water storage container and the nitrogen inlet port, the water storage container having a water-nitrogen mixture outlet, the pipeline having a water-nitrogen mixture inlet and an organic solvent vapor inlet at a position between the first valve and the second valve, the water-nitrogen mixture outlet and the water-nitrogen mixture inlet being connected through a second connecting pipe, a fourth valve being arranged on the second connecting pipe to control the opening and closing of the water-nitrogen mixture outlet and the water-nitrogen mixture inlet, an organic solvent container being connected to the organic solvent vapor inlet for storing organic solvent, and a vapor assembly being arranged on the organic solvent container to enable the organic solvent to enter the cleaning object connection port in the form of organic solvent vapor.

[0006] In some embodiments, the vapor assembly comprises a first heating assembly arranged on the organic solvent container and capable of heating the organic solvent container, and a first temperature sensor for detecting the temperature of the organic solvent container.

[0007] In some embodiments, the pipeline is provided with a second heating assembly capable of heating the pipeline and a second temperature sensor for detecting the temperature of the pipeline.

[0008] In some embodiments, the pipeline is provided with a third heating assembly capable of heating the pipeline and a third temperature sensor for detecting the temperature of the pipeline at a position close to the organic solvent container.

[0009] In some embodiments, the vapor assembly comprises a fourth connecting pipe arranged between the organic solvent container and the nitrogen inlet port, and a sixth valve arranged on the fourth connecting pipe to control the opening and closing of the organic solvent container and the nitrogen inlet port, the nitrogen being capable of mixing with the organic solvent in the organic solvent container to form a mixed vapor composed of nitrogen and organic solvent vapor.

[0010] In some embodiments, the end of the fourth connecting pipe connected with the organic solvent container is arranged close to the lower part of the organic solvent container.

[0011] In some embodiments, the pipeline comprises a first pipe section, a second pipe section and a third pipe section which are in communication with each other, the air pump connection port and the first valve are arranged on the first pipe section, the nitrogen gas inlet port and the second valve are arranged on the second pipe section, and the cleaning object connection port is arranged on the third pipe section.

[0012] In a second aspect, the first cleaning method is provided, which is performed by using the cleaning device described above, and comprises the following steps:

[0013] connecting the cleaning object to the cleaning object connection port, and the cleaning object is closed inside;

[0014] in response to the operation of the user,

[0015] starting the air pump, opening the first valve, pumping the air in the pipeline and the cleaning object, and making the inside of the cleaning object to be in a negative pressure, and maintaining for a preset time;

[0016] closing the first valve, opening the second valve, and making the nitrogen gas to enter the pipeline and the inside of the cleaning object along the cleaning object connection port, and when the pressure in the inside of the cleaning object reaches a preset pressure, closing the second valve and maintaining for a preset time;

[0017] opening the first valve, and the air pump pumps the nitrogen gas in the pipeline and the cleaning object.

[0018] In a third aspect, the second cleaning method is provided, which is performed by using the cleaning device described above, and comprises the following steps:

[0019] connecting the cleaning object to the cleaning object connection port, and the cleaning object is closed inside;

[0020] in response to the operation of the user,

[0021] opening the second valve, and making the nitrogen gas to enter the pipeline and the inside of the cleaning object along the cleaning object connection port, and when the pressure in the inside of the cleaning object reaches a preset pressure, closing the second valve and maintaining for a preset time;

[0022] starting the air pump, opening the first valve, and the air pump pumps the nitrogen gas in the pipeline and the cleaning object, and making the inside of the cleaning object to be in a negative pressure, and maintaining for a preset time;

[0023] Close the first valve, open the third and fourth valves, nitrogen enters the water container through the first connecting pipe, nitrogen mixes with water to form water-nitrogen mixture, the water-nitrogen mixture enters the pipeline through the second connecting pipe, and enters the interior of the to-be-cleaned object through the cleaning object connecting port, when the pressure in the interior of the to-be-cleaned object reaches a preset pressure, the third and fourth valves are closed, and a preset time is kept.

[0024] The first valve is opened, the water-nitrogen mixture in the pipeline and the to-be-cleaned object is pumped out, and the interior of the to-be-cleaned object is kept at negative pressure for a preset time.

[0025] In a fourth aspect, a third cleaning method is provided, which is performed by using the cleaning device described above, and includes the following steps:

[0026] The to-be-cleaned object is connected to the cleaning object connecting port, and the interior of the to-be-cleaned object is closed;

[0027] In response to the operation of a user,

[0028] The second valve is opened, nitrogen enters the pipeline, and enters the interior of the to-be-cleaned object through the cleaning object connecting port, when the pressure in the interior of the to-be-cleaned object reaches a preset pressure, the second valve is closed, and a preset time is kept.

[0029] The air pump is started, the first valve is opened, the nitrogen in the pipeline and the to-be-cleaned object is pumped out, and the interior of the to-be-cleaned object is kept at negative pressure for a preset time.

[0030] The first valve is closed, the fifth valve is opened, the organic solvent vapor in the organic solvent container enters the pipeline, and enters the interior of the to-be-cleaned object through the cleaning object connecting port, when the pressure in the interior of the to-be-cleaned object reaches a preset pressure, a preset time is kept.

[0031] The fifth valve is closed, the first valve is opened, and the air pump pumps out the organic solvent vapor in the pipeline and the to-be-cleaned object.

[0032] Compared with the prior art, the beneficial effects of the present application are that: due to the air extraction pump arranged on the pipeline, the air inside the to-be-cleaned article connected to the pipeline can be extracted, so that the to-be-cleaned article is in a negative pressure state; and due to the nitrogen inlet arranged on the pipeline for nitrogen to enter, nitrogen can be filled into the to-be-cleaned article connected to the pipeline, so that the to-be-cleaned article is in a nitrogen pressurized state, and through repeated negative pressure and nitrogen pressurization, the aerosol, particles and other impurities remaining in the to-be-cleaned article can be removed. In addition, since the water storage container is connected to the nitrogen inlet, and the water storage container is connected to the pipeline, nitrogen can combine with water in the water storage container to form water-nitrogen mixed gas, and the water-nitrogen mixed gas can enter the to-be-cleaned article through the pipeline to remove the aldehyde and ketone substances remaining in the article; and since the organic solvent container is arranged on the pipeline, the organic solvent vapor volatilized from the organic solvent container can be filled into the to-be-cleaned article to remove the high-boiling-point substances remaining in the article. Thus, the cleaning of the to-be-cleaned article is realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The first cleaning device provided by the embodiment of the present application is shown in a schematic view.

[0034] Figure 2 The second cleaning device provided by the embodiment of the present application is shown in a schematic view.

[0035] In the figure, 1 is an air extraction pump; 11 is an air extraction port; 12 is an air exhaust port; 2 is a junction area; 21 is a first pipe section; 211 is a first valve; 212 is a pressure sensor; 213 is a water removal component; 214 is an air extraction pump connection port; 22 is a second pipe section; 221 is a nitrogen inlet; 222 is a second valve; 223 is a water-nitrogen mixed gas inlet; 224 is an organic solvent vapor inlet; 23 is a third pipe section; 231 is a to-be-cleaned article connection port; 3 is a first connecting pipe; 31 is a third valve; 4 is a water storage container; 41 is a water-nitrogen mixed gas outlet; 42 is a water injection port; 5 is a second connecting pipe; 51 is a fourth valve; 6 is an organic solvent container; 61 is an organic solvent vapor outlet; 62 is an organic solvent injection port; 7 is a third connecting pipe; 71 is a fifth valve; 8 is a first heating assembly; 9 is a second heating assembly; 10 is a third heating assembly; 110 is a fourth connecting pipe; and 111 is a sixth valve. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

[0037] Figure 1 The first cleaning device provided by the embodiment of the present application is shown in a schematic view. Please refer to Figure 1The cleaning device is used for cleaning the to-be-cleaned object, removing aerosols, particles, VOCs (including aldehyde and ketone substances and high-boiling volatile organic compounds) and other impurities remaining in the to-be-cleaned object. The to-be-cleaned object can be a single disassembled pipeline, a pipeline installed on an automatic sampler, or a sampling container. The cleaning device comprises a gas suction pump 1 and a pipeline, one end of the pipeline is connected with a gas suction port 11 of the gas suction pump 1, so that the gas suction pump 1 can suck the gas in the pipeline, and when the to-be-cleaned object is connected to the pipeline, part of the impurities can be removed by suction.

[0038] The pipeline has a gas suction pump connecting port 214 connected with the gas suction port 11 of the gas suction pump 1, a cleaning object connecting port 231 for connecting with the to-be-cleaned object, and a nitrogen inlet port 221 for nitrogen to enter, the gas suction pump connecting port 214, the cleaning object connecting port 231 and the nitrogen inlet port 221 extend to the inside of the pipeline to form a convergence area 2. In this embodiment, the pipeline comprises a first pipe section 21, a second pipe section 22 and a third pipe section 23, the gas suction pump connecting port 214 is located on the first pipe section 21, the nitrogen inlet port 221 is located on the second pipe section 22, and the cleaning object connecting port 231 is located on the third pipe section 23, the first pipe section 21, the second pipe section 22 and the third pipe section 23 are in communication with each other, specifically, the upper ends of the first pipe section 21 and the second pipe section 22 are directly communicated, a first convergence point is formed at the connection between the first pipe section 21 and the second pipe section 22, the left ends of the second pipe section 22 and the third pipe section 23 are directly communicated, a second convergence point is formed at the connection between the second pipe section 22 and the third pipe section 23, and the area between the first convergence point and the second convergence point can also be considered as the convergence area. In addition, the convergence area can continue to extend outward along the pipeline until a structure such as a valve is present to selectively close the pipeline.

[0039] It should be noted that the first pipe section 21, the second pipe section 22 and the third pipe section 23 can also be connected at one convergence point, that is, the first convergence point and the second convergence point in the above can coincide, and the position around the convergence point is the convergence area.

[0040] As shown in Figure 1 The gas suction pump connecting port 214 is arranged at the left end of the first pipe section 21, and a first valve 211 is arranged on the first pipe section 21, the first valve 211 is used for opening and closing the first pipe section 21, so as to realize the on-off connection between the gas suction pump 1 and the convergence area 2. Specifically, when the first valve 211 is opened, the gas suction pump 1 and the convergence area 2 are communicated, and when the first valve 211 is closed, the gas suction pump 1 and the convergence area 2 are not communicated.

[0041] As shown in Figure 1As shown, the nitrogen inlet 221 is arranged at the lower end of the second pipe section 22, and the lower part of the second pipe section 22 is further provided with a second valve 222 for opening and closing the second pipe section 22, so as to realize the on-off between the nitrogen inlet 221 and the intersection area 2. Specifically, when the second valve 222 is opened, nitrogen can enter the intersection area 2 through the nitrogen inlet 221 and enter the inside of the to-be-cleaned object through the third pipe section 23; when the second valve 222 is closed, nitrogen cannot pass through the second valve 222 and thus cannot enter the intersection area 2.

[0042] As shown in Figure 1 , the cleaning object connecting port 231 is arranged at the right end of the third pipe section 23 and directly communicates with the intersection area 2. When the to-be-cleaned object is a single disassembled pipeline or a sampling container, it is necessary to provide a heating bag, a heating sleeve or the like for the pipeline or the sampling container to realize heating of the object, so that the pipeline or the sampling container can be heated, which is beneficial to accelerate the movement rate of volatile substances remaining in the pipeline or the sampling container and facilitate the discharge of the volatile substances. When the to-be-cleaned object is a pipeline installed in an automatic sampler, the pipeline can be directly heated by using the heating device provided in the automatic sampler. In addition, since the automatic sampler usually has one sample outlet pipeline and multiple sample inlet pipelines, the sample outlet pipeline and the sample inlet pipelines can be selectively communicated through a multi-way valve, so that only the sample outlet pipeline needs to be connected to the cleaning object connecting port 231, and the cleaning of all sample inlet pipelines can be realized through the control of the multi-way valve. The specific cleaning mode of the cleaning device will be described in detail below.

[0043] Continuing to refer to Figure 1 , the nitrogen inlet 221 is further connected with a water storage container 4 through a first connecting pipe 3, the water storage container 4 is used for storing water, and the first connecting pipe 3 is provided with a third valve 31 for opening and closing the first connecting pipe 3, so as to realize the on-off between the nitrogen inlet 221 and the water storage container 4. Specifically, when the third valve 31 is opened, nitrogen can enter the water storage container 4 from the nitrogen inlet 221 through the first connecting pipe 3; when the third valve 31 is closed, nitrogen is blocked by the third valve 31 and cannot enter the water storage container 4.

[0044] In addition, the water storage container 4 comprises a water-nitrogen mixture outlet 41, and a water-nitrogen mixture inlet 223 is arranged on the pipeline, the water-nitrogen mixture outlet 41 and the water-nitrogen mixture inlet 223 are connected through a second connecting pipe 5, the fourth valve 51 is arranged on the second connecting pipe 5, and the fourth valve 51 is used for opening and closing the second connecting pipe 5, so as to realize the on-off between the water storage container 4 and the pipeline. Specifically, when the fourth valve 51 is opened and the third valve 31 is also opened, the nitrogen gas can enter the first connecting pipe 3 from the nitrogen gas inlet 221, and is mixed with the water in the water storage container 4 to form water-nitrogen mixture, and then the water-nitrogen mixture enters the pipeline from the second connecting pipe 5; when the fourth valve 51 and the third valve 31 are closed, the nitrogen gas is blocked by the third valve 31, cannot enter the water storage container 4, cannot form water-nitrogen mixture, and naturally cannot enter the pipeline through the second connecting pipe 5. The water-nitrogen mixture can remove the residual aldehyde and ketone substances in the object.

[0045] In order to facilitate the nitrogen gas entering the water storage container 4 to combine with the water to form water-nitrogen mixture, the outlet of the first connecting pipe 3 is arranged at a position close to the bottom of the water storage container 4, so that the nitrogen gas enters the water storage container 4 at a low height, and ensures that the water-nitrogen mixture can be formed even when there is only a small amount of water in the water storage container 4. The water-nitrogen mixture outlet 41 is arranged at a position close to the upper part of the water storage container 4, so that the water-nitrogen mixture can be discharged from the upper part of the water storage container 4.

[0046] In addition, in order to facilitate the addition of water to the water storage container 4, a water inlet 42 can be arranged at the upper part or the top of the water storage container 4.

[0047] Continuing to refer to Figure 1 The cleaning device further comprises an organic solvent container 6, and the organic solvent container 6 is used for storing organic solvents such as methanol and ethanol. The organic solvent container 6 has an organic solvent vapor outlet 61, the organic solvent vapor outlet 61 is connected with an organic solvent vapor inlet 224 on the pipeline through a third connecting pipe 7, the fifth valve 71 is arranged on the third connecting pipe 7, and the fifth valve 71 is used for opening or closing the third connecting pipe 7, so as to realize the on-off between the organic solvent container 6 and the pipeline. Specifically, when the fifth valve 71 is opened, the organic solvent vapor formed by volatilization of the organic solvents in the organic solvent container 6 can enter the pipeline through the third connecting pipe 7; when the fifth valve 71 is closed, the organic solvent vapor in the organic solvent container 6 is blocked by the fifth valve 71 and cannot enter the pipeline.

[0048] In addition, in order to facilitate the addition of organic solvent to the organic solvent container 6, an organic solvent inlet 62 can be arranged at the upper portion or top of the organic solvent container 6. The organic solvent vapor is used to remove high-boiling volatile substances in VOCs, and various organic solvents have different saturated vapor pressures at different temperatures. The heating temperature of the organic solvent can be set according to the needs. Under closed conditions, the higher the temperature, the greater the pressure of the organic solvent vapor, and the greater the density of the organic solvent vapor, the stronger the ability to dissolve the residual high-boiling substances.

[0049] Specifically, according to the gas state equation PV=nRT and n=m / M, it can be deduced that ρ=PM / RT, wherein,

[0050] ρ is the density of the gas, g / L;

[0051] n is the number of moles, mol;

[0052] m is the mass of the gas, g;

[0053] M is the molecular weight of methanol, i.e. 32 g / mol;

[0054] P is the pressure, kpa;

[0055] V is the volume, L;

[0056] R is the gas constant, i.e. 8.314 kpa ;

[0057] T is the thermodynamic temperature of the gas, K.

[0058] As can be seen from the formula ρ=PM / RT, only T and P pressure are unknown. In this embodiment, the organic solvent is taken as an example of methanol, and the relationship between the temperature and pressure of methanol is shown in Table 1.

[0059] Table 1: Comparison table of methanol temperature and saturated vapor pressure.

[0060]

[0061] It should be noted that the water-nitrogen mixed gas inlet 223 and the organic solvent vapor inlet 224 in the above should be arranged on the pipeline between the first valve 211 and the second valve 222, i.e. cannot be arranged on the first pipe section 21 outside the first valve 211, nor can be arranged on the second pipe section 22 outside the second valve 222. Specifically, it can be arranged on the pipeline close to the intersection area 2, so that the water-nitrogen mixed gas and the organic solvent vapor can enter the object to be cleaned and maintain a certain pressure.

[0062] Continuing to refer to Figure 1In order to accelerate the evaporation rate of the organic solvent in the organic solvent container 6, the organic solvent container 6 can be heated, for example, a first heating assembly 8 can be wrapped outside the organic solvent container 6, and the first heating assembly 8 at least wraps the lower part of the organic solvent container 6 to be close to the organic solvent. When the first heating assembly 8 heats the organic solvent container 6, the organic solvent inside the organic solvent container 6 is heated and the evaporation rate is accelerated, a large amount of organic solvent vapor is formed, and then discharged from the organic solvent vapor outlet 61. In addition, in order to control the temperature of the first heating assembly 8, a first temperature sensor can be arranged on the organic solvent container 6, and the first temperature sensor and the first heating assembly 8 are connected to the upper computer. The temperature of the first heating assembly 8 is controlled by the program in the upper computer.

[0063] In order to ensure that the organic solvent vapor will not be liquefied when the pipeline is full, a second heating assembly 9 can be arranged on the pipeline, especially at the positions of the second pipe section 22 and the third pipe section 23, so that the organic solvent vapor can enter the object to be cleaned through the second pipe section 22 and the third pipe section 23. In addition, a second temperature sensor can be arranged on the pipeline to detect the temperature of the pipeline, and the second temperature sensor and the second heating assembly 9 are connected to the upper computer. The temperature of the second heating assembly 9 is controlled by the program in the upper computer.

[0064] Further, a third heating assembly 10 can be arranged on the third connecting pipe 7 to heat the organic solvent vapor in the third connecting pipe 7, so as to ensure that the organic solvent vapor is in a vapor state when entering the second pipe section 22. A third temperature sensor can also be arranged on the third connecting pipe 7 to detect the temperature of the third connecting pipe 7. The third temperature sensor and the third heating assembly 10 can be connected to the upper computer, and the temperature of the third heating assembly 10 is controlled by the program in the upper computer.

[0065] As shown in Figure 1 , a pressure sensor 212 is also arranged in the intersection area 2 of the pipeline, and the pressure sensor 212 is used to detect the air pressure in the intersection area 2.

[0066] As shown in Figure 1 , a water removal component 213 is also arranged on the first pipe section 21 to remove water in the pipeline. The water removal component 213 can be silica gel, which can absorb water vapor to avoid water vapor in the gas entering the air pump 1 and affecting the normal work of the air pump 1. A three-way pipe 13 is arranged on the exhaust port 12 of the air pump 1. The first interface of the three-way pipe 13 is connected with the exhaust port 12, the second interface of the three-way pipe 13 is connected with the organic solvent adsorption component 14, and the third interface of the three-way pipe 13 is connected with the organic solvent container 6. Figure 1 Figure 1 Figure 1 ​​The left interface is connected with the atmosphere, and the seventh valve 131 is arranged on the tee joint 13, and the seventh valve 131 is used for controlling the communication between the first interface and the second interface or the communication between the first interface and the third interface. The organic solvent adsorption component 14 is used for adsorbing the organic solvent discharged from the exhaust port 12, so as to avoid the emission of the organic solvent and the VOCs absorbed by the organic solvent into the atmosphere.

[0067] In the embodiment, the first valve 211, the second valve 222, the third valve 31, the fourth valve 51, the fifth valve 71 and the seventh valve 131 can be electromagnetic valves, and the electromagnetic valves are connected with the upper computer, and the opening and closing are controlled by the upper computer. However, manual valves can also be used, and the opening and closing are realized by manual mode.

[0068] In the embodiment, the material of the pipeline through which the organic solvent flows is stainless steel. Specifically, the material of the third connecting pipe 7, the second pipe section 22, the third pipe section 23, the first pipe section 21 and the tee joint 131 is stainless steel.

[0069] The cleaning device has a first cleaning mode and a second cleaning mode. The first cleaning mode is used for cleaning aerosols and particles and other impurities in the to-be-cleaned object. The second cleaning mode is used for cleaning residual VOCs (including aldehyde ketone substances and high-boiling volatile organic compounds) in the object.

[0070] The working process of the first cleaning mode is as follows:

[0071] The to-be-cleaned object is connected to the cleaning object connecting port 231, and it is ensured that the inside of the to-be-cleaned object is kept closed;

[0072] The air suction pump 1 is started, the first valve 211 is opened (the other valves are closed), and the air suction pump 1 sucks out the air in the to-be-cleaned object along the first pipe section 21 and the third pipe section 23, so that the inside of the to-be-cleaned object is in a negative pressure state, and the pressure displayed by the pressure sensor 212 reaches a preset value or below. In this state, a preset time is kept;

[0073] After the preset time, the first valve 211 is closed, the second valve 222 is opened, and the nitrogen enters the second pipe section 22 through the nitrogen inlet 221 and continues to enter the third pipe section 23, and finally enters the inside of the to-be-cleaned object, so that the nitrogen forms a positive pressure in the to-be-cleaned object. The specific pressure value can be observed by the pressure sensor 212. When the positive pressure reaches a preset value, the second valve 222 is closed, and a preset time is kept in this state;

[0074] After the preset time, the first valve 211 is opened, and the air suction pump 1 sucks out the nitrogen in the to-be-cleaned object.

[0075] The above process is a cycle, and multiple cycles can be set according to actual needs. The first cleaning mode can remove aerosols, particles and other impurities in the to-be-cleaned object, but cannot completely remove the residual VOCs in the object.

[0076] The working process of the second cleaning mode is as follows:

[0077] The to-be-cleaned object is connected to the cleaning object connecting port 231, and it is ensured that the inside of the to-be-cleaned object is kept closed;

[0078] The second valve 222 is opened, nitrogen enters the second pipe section 22 through the nitrogen inlet 221, and continues to enter the third pipe section 23, and finally enters the inside of the to-be-cleaned object, so that the nitrogen forms a positive pressure in the to-be-cleaned object. The specific pressure value can be observed by the pressure sensor 212, when the positive pressure reaches the preset value, the second valve 222 is closed, and the preset time is kept in this state;

[0079] After the preset time, the air pump 1 is started, the first valve 211 is opened, and the air pump 1 along the first pipe section 21 and the third pipe section 23 exhausts the nitrogen in the to-be-cleaned object, so that the inside of the to-be-cleaned object is in a negative pressure state, until the pressure sensor 212 displays the pressure reaches the preset value or below, keep the preset time in this state;

[0080] After the preset time, the first valve 211 is closed, the third valve 31 and the fourth valve 51 are opened, nitrogen enters the first connecting pipe 3 through the nitrogen inlet 221, and continues to enter the water storage container 4. After the nitrogen and water are mixed, the water-nitrogen mixed gas is formed, the water-nitrogen mixed gas enters the second connecting pipe 5 through the water-nitrogen mixed gas outlet 41 of the water storage container 4, and enters the second pipe section 22 through the water-nitrogen mixed gas inlet 223, and then enters the to-be-cleaned object through the third pipe section 23. The water-nitrogen mixed gas is filled into the to-be-cleaned object and combined with the aldehyde ketone substance, when the pressure of the water-nitrogen mixed gas reaches the preset value, the third valve 31 and the fourth valve 51 are closed, and the preset time is kept in this state.

[0081] After the preset time, the first valve 211 is opened, and the air pump 1 along the first pipe section 21 and the third pipe section 23 exhausts the water-nitrogen mixed gas in the to-be-cleaned object, so that the inside of the to-be-cleaned object is in a negative pressure state, until the pressure sensor 212 displays the pressure reaches the preset value or below, keep the preset time in this state;

[0082] After a preset time, the first valve 211 is closed, the fifth valve 71 is opened, the first heating assembly 8, the second heating assembly 9 and the third heating assembly 10 are started, and the temperature of the first heating assembly 8, the second heating assembly 9 and the third heating assembly 10 is maintained at a preset value. The organic solvent in the organic solvent container 6 is heated and evaporated to form organic solvent vapor. The organic solvent vapor enters the third connecting pipe 7 through the organic solvent vapor outlet 61, enters the second pipe section 22 through the organic solvent vapor inlet 224, and then enters the interior of the object to be cleaned through the third pipe section 23. The organic solvent vapor can combine with the high-boiling volatile organic compounds. In this state, a preset time is maintained.

[0083] After a preset time, the fifth valve 71 is closed, the first valve 211 and the seventh valve 131 (so that the exhaust port 12 is communicated with the organic solvent adsorption component 14) are opened, and the air pump 1 is used to pump out the organic solvent vapor in the object to be cleaned along the first pipe section 21 and the third pipe section 23, so that the interior of the object to be cleaned is in a negative pressure state. Until the pressure sensor 212 displays a pressure value that is equal to or less than a preset value, a preset time is maintained in this state.

[0084] The above process is a cycle, and multiple cycles can be set according to actual needs. The second cleaning mode can remove the residual VOCs in the object.

[0085] In addition, the first cleaning mode and the second cleaning mode can also be combined or simplified according to actual needs. For example, a water-nitrogen mixed gas cleaning step or an organic solvent vapor cleaning step is added on the basis of the first cleaning mode.

[0086] Figure 2 A schematic diagram of a second cleaning device provided by an embodiment of the present application is shown. Please refer to Figure 2The second cleaning device is different from the first cleaning device in that the first heating assembly 8, the first temperature sensor, the second heating assembly 9, the second temperature sensor, the third heating assembly 10 and the third temperature sensor are no longer arranged, the fourth connecting pipe 110 and the sixth valve 111 are added, one end of the fourth connecting pipe 110 is in communication with the nitrogen inlet 221 of the second pipe section 22, the other end of the fourth connecting pipe 110 is in communication with the organic solvent container 6, the sixth valve 111 is arranged on the fourth connecting pipe 110 and controls the opening and closing of the fourth connecting pipe 110, when the sixth valve 111 is opened, nitrogen can enter the organic solvent container 6 through the fourth connecting pipe 110, so that mixed steam formed by mixing nitrogen and organic solvent is formed, since no device capable of heating the organic solvent container is arranged in the scheme, only a small amount of organic solvent is volatilized, it is difficult to form saturated organic solvent steam, only a small amount of VOCs remaining in the article can be cleaned, but since no heating device is arranged, power consumption can be greatly reduced. The use process of the cleaning device in the scheme can be adaptively adjusted with reference to the first cleaning device.

[0087] The above describes the embodiments of the present application, and through the above description of the disclosed embodiments, the person skilled in the art can implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cleaning device, characterized in that The cleaning device comprises an air extraction pump and a pipeline, the pipeline has an air extraction pump connecting port connected with an air extraction port of the air extraction pump, a cleaning object connecting port for connecting with an object to be cleaned, and a nitrogen inlet port for nitrogen entering, the air extraction pump connecting port, the cleaning object connecting port and the nitrogen inlet port extend to the inside of the pipeline to form a meeting area, a pressure sensor is arranged on the pipeline at a position directly communicating with the meeting area, a first valve for controlling the opening and closing of the air extraction pump connecting port and the meeting area and a second valve for controlling the opening and closing of the nitrogen inlet port and the meeting area are arranged on the pipeline, a water storage container for storing water is arranged on the nitrogen inlet port through a first connecting pipe, a third valve for controlling the opening and closing of the water storage container and the nitrogen inlet port is arranged on the first connecting pipe, the water storage container has a water-nitrogen mixed gas outlet, the pipeline has a water-nitrogen mixed gas inlet and an organic solvent steam inlet at a position between the first valve and the second valve, the water-nitrogen mixed gas outlet and the water-nitrogen mixed gas inlet are connected through a second connecting pipe, a fourth valve for controlling the opening and closing of the water-nitrogen mixed gas outlet and the water-nitrogen mixed gas inlet is arranged on the second connecting pipe, an organic solvent container for storing organic solvent is connected to the organic solvent steam inlet, and a steam assembly is arranged on the organic solvent container to enable the organic solvent to enter the cleaning object connecting port in the form of organic solvent steam.

2. The cleaning apparatus according to claim 1, wherein The steam assembly comprises a first heating assembly arranged on the organic solvent container and capable of heating the organic solvent container, and a first temperature sensor for detecting the temperature of the organic solvent container.

3. The cleaning apparatus of claim 2, wherein The pipeline is provided with a second heating assembly capable of heating the pipeline and a second temperature sensor for detecting the temperature of the pipeline.

4. The cleaning apparatus of claim 3, wherein A third heating assembly capable of heating the pipeline and a third temperature sensor for detecting the temperature of the pipeline are arranged on the pipeline close to the organic solvent container.

5. The cleaning apparatus of claim 1, wherein The steam assembly comprises a fourth connecting pipe arranged between the organic solvent container and the nitrogen inlet port, and a sixth valve for controlling the opening and closing of the organic solvent container and the nitrogen inlet port is arranged on the fourth connecting pipe, and the nitrogen can be mixed with the organic solvent in the organic solvent container to form a mixed steam composed of nitrogen and organic solvent steam.

6. The cleaning apparatus of claim 5, wherein The end of the fourth connecting pipe connected with the organic solvent container is arranged close to the lower part of the organic solvent container.

7. The cleaning apparatus of claim 1, wherein The pipeline comprises a first pipe section, a second pipe section and a third pipe section communicating with each other, the air extraction pump connecting port and the first valve are arranged on the first pipe section, the nitrogen inlet port and the second valve are arranged on the second pipe section, and the cleaning object connecting port is arranged on the third pipe section.

8. A cleaning method, characterized by, The cleaning device is used to perform the following steps: The object to be cleaned is connected to the cleaning object connecting port, and the inside of the object to be cleaned is closed; In response to the operation of a user, starting the air pump, opening the first valve, pumping the air in the pipe and the cleaning object, and making the inside of the cleaning object in negative pressure for a preset time; closing the first valve, opening the second valve, nitrogen entering the pipe and the inside of the cleaning object through the cleaning object connecting port, closing the second valve when the pressure in the inside of the cleaning object reaches a preset pressure, and keeping for a preset time; opening the first valve, the air pump pumping the nitrogen in the pipe and the cleaning object.

9. A cleaning method, characterized by, The cleaning method is performed by using the cleaning device of any one of claims 1-7, and comprises the following steps: connecting a cleaning object to the cleaning object connecting port, and sealing the inside of the cleaning object; in response to the operation of a user, opening the second valve, nitrogen entering the pipe and the inside of the cleaning object through the cleaning object connecting port, closing the second valve when the pressure in the inside of the cleaning object reaches a preset pressure, and keeping for a preset time; starting the air pump, opening the first valve, pumping the nitrogen in the pipe and the cleaning object, and making the inside of the cleaning object in negative pressure for a preset time; closing the first valve, opening the third valve and the fourth valve, nitrogen entering the water container through the first connecting pipe, nitrogen mixing with water to form water-nitrogen mixed gas, the water-nitrogen mixed gas entering the pipe through the second connecting pipe and the cleaning object connecting port, closing the third valve and the fourth valve when the pressure in the inside of the cleaning object reaches a preset pressure, and keeping for a preset time; opening the first valve, the air pump pumping the water-nitrogen mixed gas in the pipe and the cleaning object, and making the inside of the cleaning object in negative pressure for a preset time.

10. A cleaning method, characterized by, The cleaning method is performed by using the cleaning device of any one of claims 1-7, and the organic solvent container is connected to the pipe through a third connecting pipe, and a fifth valve is arranged on the third connecting pipe, The cleaning method comprises the following steps: connecting a cleaning object to the cleaning object connecting port, and sealing the inside of the cleaning object; in response to the operation of a user, opening the second valve, nitrogen entering the pipe and the inside of the cleaning object through the cleaning object connecting port, closing the second valve when the pressure in the inside of the cleaning object reaches a preset pressure, and keeping for a preset time; starting the air pump, opening the first valve, pumping the nitrogen in the pipe and the cleaning object, and making the inside of the cleaning object in negative pressure for a preset time; closing the first valve, opening the fifth valve, the organic solvent vapor in the organic solvent container entering the pipe and the inside of the cleaning object through the cleaning object connecting port, and keeping for a preset time when the pressure in the inside of the cleaning object reaches a preset pressure. With the fifth valve closed and the first valve open, the pump evacuates the organic solvent vapor from the tubing and the article to be cleaned.

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