Air conditioner purification system for cleaning workshop

Abstract

The invention provides an air conditioner purification system for cleaning a workshop. The system comprises a fresh air unit, an air conditioning unit and a filtering air supply device, wherein the fresh air unit is used for performing coarse filtering and humidity regulation on outdoor fresh air; the air conditioning unit is used for performing medium-efficiency filtering and temperature regulation on flowing air; the filtering air supply device is used for efficiently filtering the air regulated and purified by the air conditioning unit and supplying the air into a clean space; the air return fresh air device is arranged on the upstream of an air flow path of the air conditioning unit, and the measurement and control system is responsible for measuring, regulating and controlling indoor environment parameters and system operation parameters. The invention provides a novel air conditioner purification system flow and a regulation and control method, solves the decoupling problem of mutual coupling of positive pressure regulation and control and humidity regulation and control, realizes independent regulation and control of four environmental parameters, namely temperature, humidity, cleanliness and positive pressure, of the clean workshop, improves the control precision of the environmental parameters of the clean workshop, and improves the control precision of the clean workshop. And the operation energy consumption of air conditioner purification is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of air conditioning purification, and in particular to an air conditioning purification system for independently regulating four environmental parameters of temperature, humidity, cleanliness and positive pressure in a clean workshop. Background Art

[0002] The production, assembly and testing work in the fields of aerospace, electronics and biopharmaceuticals need to be carried out in clean workshops. Clean workshops are typical high-energy consumption buildings. How to reduce energy consumption is an important problem that needs to be solved in the design of clean workshops. There are many indoor environmental parameters that need to be controlled in clean workshops. It is required to adjust and control the four indoor environmental parameters of indoor temperature, humidity, cleanliness and positive pressure at the same time. However, these four indoor environmental parameters are interrelated and coupled. Adjusting one of them usually causes changes in other related parameters, so it is difficult to accurately control them at the same time. For example, in order to improve the control accuracy of air-conditioning temperature and humidity parameters, cooling condensation dehumidification is usually used to achieve the required moisture content, and then electric heating and other heating methods are used to increase the temperature for temperature control. This will cause the problem of cold and heat offset, which greatly increases the operating energy consumption of air conditioning purification. However, how to decouple these four parameters and achieve independent and precise control of the four parameters is an important technical problem that has not been satisfactorily solved in the design of clean workshops.

[0003] At present, the existing technologies include the following:

[0004] (1) A Chinese invention patent with authorization announcement number CN102297502B discloses a vertically mounted FFU system for a clean room, the system comprising an air filter unit (FFU) vertically mounted on the ceiling (or floor) of the clean room;

[0005] (2) The Chinese invention patent application with application publication number CN105299758A discloses an environmentally friendly purification air conditioning system for a clean room, in which a water collecting tank is arranged below the heat exchange coil in the air conditioning unit, and the water in the water collecting tank is heated or cooled by the heat exchange coil to adjust and control the air humidity; and

[0006] (3) A Chinese utility model with authorization announcement number CN207113088U discloses a clean room and purification system (CN207113088U), which adopts an air flow organization form with air supply vents all over the top and return air on the ground.

[0007] However, none of the above systems in the prior art involve independent regulation and control of indoor environmental parameters.

[0008] In addition, the prior art has the following related patent documents on air-conditioning systems that independently control temperature and humidity parameters: including temperature and humidity dual-parameter control air-conditioning refrigeration unit CN201120151858.X, a temperature and humidity independent control air-conditioning system suitable for large spaces CN201720367465.X, a temperature and humidity independent control air-conditioning system CN201610240179.7, a temperature and humidity independent control air-conditioning system CN201710223241.6, a temperature and humidity independent control air-conditioning system CN201710050861.4, and a temperature and humidity independent control air-conditioning system CN201520688772.9. These patents all solve the problem of independent control of indoor temperature and humidity parameters, and do not involve the problem of independent control of four parameters: temperature, humidity, cleanliness and positive pressure. These patents for temperature and humidity independent control air-conditioning systems all use room The method of dehumidifying (or humidifying) fresh air realizes independent control of indoor humidity. The larger the fresh air volume, the stronger the indoor dehumidification (or humidification) capacity. However, there are the following problems in the application of this method in clean workshops: Since the clean hall of the clean workshop is well sealed, the fresh air volume will be too small. When the indoor humidity load is large, the fresh air volume required for dehumidification treatment is large. Too small fresh air volume will make the fresh air dehumidification or humidification volume unable to meet the requirements, and the indoor humidity will be out of control. This is the contradiction between positive pressure control and humidity control encountered in the application of temperature and humidity dual parameter independent control air conditioning system in clean halls. The previous temperature and humidity independent control air conditioning purification system solution can only solve this contradiction by increasing the indoor exhaust volume to meet the requirements of humidity treatment and indoor positive pressure control at the same time. However, the treatment method of significantly increasing the indoor exhaust volume to increase the fresh air volume will significantly increase the operating energy consumption of the air conditioning purification system.

[0009] Therefore, it is necessary to provide an air conditioning purification system that can independently process and control the four indoor environmental parameters of clean workshop temperature, humidity, cleanliness and positive pressure. Summary of the invention

[0010] The present invention provides an air conditioning purification system capable of independently processing and regulating four indoor environmental parameters of a clean workshop, namely, temperature, humidity, cleanliness and positive pressure. The air conditioning purification system comprises a fresh air unit arranged in sequence according to the air flow direction for coarse filtering of outdoor fresh air and independently regulating indoor humidity and indoor positive pressure, an air conditioning unit for medium filtering of air flowing through and independently regulating indoor temperature and cleanliness, and an air supply device for efficiently filtering the air regulated by the air conditioning unit and supplying air to the clean hall. The air conditioning purification system further comprises: a return air fresh air device arranged upstream of the gas flow path of the air conditioning unit, comprising a return air duct for introducing indoor air into the air conditioning unit and a mixed air duct for mixing outdoor fresh air with return air in the return air duct and introducing the mixed air into the air conditioning unit, and a measurement and control system, comprising a measuring device for measuring the indoor environmental parameters of the clean hall and the working parameters of the air conditioning purification system, and a control device for regulating the working parameters of the air conditioning purification system according to the measurement results, wherein the environmental parameters include indoor temperature, humidity, particle concentration and indoor positive pressure, and the working parameters include fan operation frequency and valve opening.

[0011] The air conditioning purification system according to the present invention can independently regulate the temperature, humidity, cleanliness and indoor positive pressure of indoor air.

[0012] Preferably, the return air duct of the return air fresh air device includes a return air port arranged in the clean hall and a return air duct connected between the return air port and the air inlet side of the air conditioning unit, and the mixed air duct of the return air fresh air device includes a bypass duct that introduces indoor return air into the air inlet of the fresh air unit. By providing the bypass duct, the air conditioning purification system according to the present invention can enable the fresh air unit to switch between a fresh air processing condition and a mixed air processing condition that processes part of the fresh air and part of the return air.

[0013] Preferably, the fresh air unit includes: a fresh air box and a coarse-effect filter arranged in the fresh air box in sequence according to the direction of the air flow, a fresh air fan for driving the flow of fresh air, a fresh air unit surface cooling heater for adjusting the temperature of the fresh air, and a humidifier for increasing the humidity of the fresh air; the air-conditioning unit includes: an air-conditioning box and an air-conditioning fan for driving the circulation of air arranged in the box in sequence according to the direction of the air flow, a surface cooling heater for adjusting the air temperature, and a medium-efficiency filter for performing medium-efficiency filtration on the air flowing through; the air supply device includes: a plurality of filtering air supply devices arranged downstream of the air path of the air-conditioning unit, and an air supply duct connected between the air outlet side of the air-conditioning unit and the air inlet side of each filtering air supply device.

[0014] Preferably, the return air fresh air device also includes a fresh air duct, which includes: a fresh air outlet arranged outside the clean hall and a fresh air inlet pipe connected between the fresh air outlet and the air inlet side of the fresh air unit.

[0015] Preferably, the measuring device of the measurement and control device includes: a fresh air inlet temperature and humidity sensor arranged on the air inlet side of the fresh air unit, a fresh air outlet temperature sensor on the air outlet side of the fresh air unit, an air conditioning supply air temperature and humidity sensor on the air outlet side of the air conditioning unit, and an indoor temperature and humidity sensor, an indoor particulate matter concentration sensor and an indoor positive pressure sensor arranged in the clean hall; the control device of the measurement and control device includes: a control cabinet arranged in the air-conditioning room, an air-conditioning unit water supply regulating valve, a fresh air unit water supply regulating valve, a humidifier water supply regulating valve, a return air bypass regulating valve on the bypass pipe, and a fresh air inlet electric valve on the fresh air inlet pipe.

[0016] Preferably, the air-conditioning fan of the air-conditioning unit is a variable frequency centrifugal fan, and the control device controls the operating frequency of the air-conditioning fan according to the particle concentration in the indoor air detected by the indoor particle concentration sensor, and takes the median value of the particle concentration that meets the predetermined air cleanliness as the control target value, wherein, when the particle concentration detected by the indoor particle concentration sensor is higher than the control target value and exceeds the set deviation value, the control device controls to increase the operating frequency of the air-conditioning fan to increase the purified air volume; and when the indoor cleanliness detected by the indoor particle concentration sensor is lower than the control target value and exceeds the set deviation value, the control device controls to decrease the operating frequency of the air-conditioning fan to reduce the purified air volume.

[0017] Preferably, the fresh air fan of the fresh air unit is a variable frequency centrifugal fan, and the regulating device controls the operating frequency of the fresh air fan according to the indoor positive pressure detected by the indoor positive pressure sensor, wherein when the indoor positive pressure is higher than the set value and exceeds the set deviation value, the regulating device lowers the operating frequency of the fresh air fan to reduce the fresh air volume; and when the indoor positive pressure is lower than the set value and exceeds the set deviation value, the regulating device increases the operating frequency of the fresh air fan to increase the fresh air volume.

[0018] Preferably, the control device controls the opening of the fresh air bypass regulating valve according to the indoor positive pressure detected by the indoor positive pressure sensor. When the amount of fresh air required to maintain the indoor positive pressure is too small to affect the independent control of the indoor humidity, the control is performed to open the fresh air bypass regulating valve to change the fresh air unit from the full air processing condition to the mixed air processing condition of fresh air and return air.

[0019] Preferably, the control device adjusts the opening of the air conditioning water supply regulating valve and the humidification water supply regulating valve of the fresh air unit according to the indoor humidity detected by the indoor temperature and humidity sensor, so as to realize the control of the indoor humidity: for summer working conditions: when the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the humidity can be reduced by opening the air conditioning water supply regulating valve; and when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the humidity can be increased by closing the air conditioning water supply regulating valve; for winter working conditions, the indoor humidity is controlled by the water supply regulating valve of the humidifier, and when the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the humidification water supply regulating valve is closed; and when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the humidification water supply regulating valve is opened;

[0020] The control device controls the opening of the fresh air bypass control valve and the fresh air inlet electric valve according to the indoor humidity detected by the indoor temperature and humidity sensor. Under summer conditions, when the air-conditioning water supply control valve of the fresh air unit is opened to the maximum and the indoor humidity continues to increase, the control device controls to open the fresh air bypass valve and simultaneously close the fresh air inlet electric valve, until the indoor humidity begins to decrease, the adjustment of the fresh air bypass valve is stopped, and the humidity is only adjusted by controlling the opening of the air-conditioning water supply valve of the fresh air unit; under winter conditions, when the humidification water supply manual valve of the fresh air unit is opened to the maximum and the indoor humidity continues to decrease, the control device controls to open the return air bypass valve and simultaneously close the fresh air inlet electric valve, until the indoor humidity begins to increase, the adjustment of the fresh air bypass valve is stopped, and the humidity is only adjusted by controlling the opening of the humidification water supply valve of the fresh air unit.

[0021] Preferably, if the indoor positive pressure detected by the indoor positive pressure sensor is still lower than the set value and continues to decrease when the fresh air fan frequency of the fresh air unit is adjusted to the working frequency, the control device closes the return air bypass valve and synchronously opens the fresh air inlet valve until the indoor positive pressure begins to increase and is higher than the set value.

[0022] The air conditioning purification system according to the present invention is able to change the working condition of the fresh air unit from the previous working condition of processing all fresh air to the working condition of processing part of the fresh air and part of the return air by setting a bypass pipe and a fresh air bypass valve and regulating according to the above-mentioned regulation method. In this way, it is possible to maintain a smaller fresh air volume and greatly increase the processing air volume and dehumidification (or humidification) capacity of the fresh air unit, thereby solving the problem of decoupling the contradictory positive pressure control and humidity control and reducing the operating energy consumption of air conditioning purification.

[0023] In summary, the beneficial effects of the air conditioning purification system according to the present invention are: it solves the decoupling problem of independent regulation of the four parameters of indoor temperature, humidity, cleanliness and positive pressure in clean workshops, especially the contradiction between humidity control and positive pressure control when the fresh air volume in clean workshops is too small, improves the regulation accuracy of the four indoor environmental parameters, reduces the circulating air volume and fresh air volume of air conditioning purification as much as possible, and does not have the problem of hot and cold offset caused by reheating and regulation by electric heating, thereby greatly reducing the operating energy consumption of the air conditioning purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram showing the functional modules of an air conditioning purification system according to an embodiment of the present invention;

[0025] Figure 2 1 is a schematic plan view showing the structure of an air conditioning purification system according to an embodiment of the present invention.

[0026] Figure 3 It is along Figure 2 The cross-sectional view taken along line AA shows the air conditioning purification system according to the embodiment of the present invention. DETAILED DESCRIPTION

[0027] Now, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0028] In conjunction with the accompanying drawings, the structure and working process of the air conditioning purification system according to the present invention are described in detail by taking a clean room with top air supply, single-side lower return air and centralized air conditioning purification scheme as an example. However, it is obvious that the present invention is not limited to this, and other air flow organization forms such as top air supply, double-side lower return air and layered air conditioning purification with side supply and side return, as well as decentralized air conditioning purification schemes, can also be adopted.

[0029] See also Figures 1 to 3According to an embodiment of the present invention, the air conditioning purification system 10 includes an air conditioning unit 100, a fresh air unit 200, an air supply device 300, a return fresh air device 400 and a measurement and control system 500 arranged in sequence according to the air flow direction. The fresh air unit 200 performs coarse filtering and humidity adjustment on the outdoor fresh air, and can realize independent regulation of indoor air humidity and indoor positive pressure. The air conditioning unit 100 performs medium efficiency filtering and temperature adjustment on the air flowing through, and can realize independent regulation of indoor air temperature and indoor air particle concentration. The air supply device 300 performs high-efficiency filtration on the air conditioned and purified by the air conditioning unit 100 and supplies air to the clean hall. The return fresh air device 400 is arranged upstream of the gas flow path of the air conditioning unit 100, and includes a return air duct 410 for introducing the indoor air of the clean hall into the air conditioning unit 100 and a mixed air duct 420 for introducing the outdoor fresh air into the air conditioning unit 100 after mixing the return air in the return air duct 410. The measurement and control system 500 includes a measuring device 510 for measuring the environmental parameters in the clean hall and the working parameters of the air conditioning purification system, and a control device 520 for adjusting the working parameters of the air conditioning purification system according to the measurement results. The environmental parameters in the clean hall include the temperature, humidity, particle concentration and positive pressure of the indoor air, and the working parameters of the air conditioning purification system include the operating frequency of the fan and the opening of each electric valve.

[0030] The air conditioning unit 100 includes an air conditioning box 110 and an air conditioning fan 120 arranged in sequence in the air conditioning box 100 according to the air flow direction for driving air circulation, an air conditioning unit surface cooling heater 130 for adjusting the air temperature, a medium efficiency filter 140 for medium efficiency filtering the air passing through, and an air conditioning unit air inlet duct 150 for conveying fresh air and part of the return air to the air inlet of the air conditioning unit.

[0031] Among them, the air conditioning fan 120 preferably adopts a variable frequency centrifugal fan, which can be operated at a variable frequency to control the size of the purified air volume. By adjusting the operating frequency of the air conditioning fan 120 of the air conditioning unit 100, the indoor air particulate concentration can be regulated. The median of the particulate concentration of the required cleanliness level is used as the control target value. When it is higher than the target value and exceeds a certain deviation value, the operating frequency of the air conditioning fan 120 is increased to increase the purified air volume; when it is lower than the target value and exceeds a certain deviation value, the operating frequency of the air conditioning fan 120 is reduced (but not less than 30Hz to ensure the minimum purified air volume) to reduce the purified air volume.

[0032] In the summer, cold water is provided to the air conditioning unit surface cooling heater 130 to cool the air, and in the winter, hot water is provided to the air conditioning unit surface cooling heater 130 to heat the air.

[0033] The air conditioning unit 100 further includes an air conditioning water supply pipe 131 and an air conditioning water return pipe 133 of the air conditioning unit, which are connected to the air conditioning unit surface cooling heater 130. As a preferred solution, an air conditioning water supply manual valve 132 for switching air conditioning water supply is provided on the air conditioning water supply pipe of the air conditioning unit, and an air conditioning water return valve 134 for switching air conditioning water return is provided on the air conditioning water return pipe 133 of the air conditioning unit. The air conditioning water supply manual valve 132 and the air conditioning water return manual valve 134 are mainly used to close the air conditioning water supply and water return pipelines when the air conditioning unit is overhauled.

[0034] The indoor temperature can be controlled by adjusting the opening of the air-conditioning water supply regulating valve 522 of the air-conditioning unit 100. Specifically, for summer conditions: when the indoor temperature is lower than the set value and exceeds a certain deviation value, the air-conditioning water supply regulating valve 522 is closed to increase the temperature; conversely, when the indoor temperature is higher than the set value and exceeds a certain deviation value, the air-conditioning water supply regulating valve 522 is opened to reduce the temperature; and for winter conditions: when the indoor temperature is lower than the set value and exceeds a certain deviation value, the air-conditioning water supply regulating valve 522 is opened to increase; conversely, when the indoor temperature is higher than the set value and exceeds a certain deviation value, the air-conditioning water supply regulating valve 522 is closed.

[0035] The fresh air unit 200 includes a fresh air box 210, a coarse filter 220 arranged in sequence in the fresh air box 210 according to the air flow direction, a fresh air fan 230 that drives the fresh air flow, a fresh air unit surface cooling heater 240 that adjusts the fresh air temperature, and a humidifier 250 that increases the fresh air humidity. The fresh air fan preferably adopts a variable frequency centrifugal fan, which can operate at a variable frequency to control the air volume delivered by the fresh air fan. The fresh air unit surface cooling heater 240 provides cold water in summer to cool and dehumidify the fresh air or part of the return air, and provides hot water in winter to heat the fresh air or part of the return air. The humidifier 250 preferably adopts a high-pressure micro-mist humidifier to humidify in winter.

[0036] The fresh air unit 200 also includes a fresh air unit air conditioning water supply pipe 243 and a fresh air unit air conditioning water return pipe 242 connected to the fresh air unit surface cooling heater 240. As a preferred solution, the fresh air unit air conditioning water supply pipe 243 is provided with a fresh air unit air conditioning water supply manual valve 241 for switching air conditioning water supply and a fresh air unit air conditioning water return manual valve 244 for switching air conditioning water return. The air conditioning water supply manual valve 241 and the air conditioning water return manual valve 244 are mainly used to close the air conditioning water supply and water return pipelines when the fresh air unit 200 is overhauled. Optionally, the fresh air unit 200 also includes a humidification water supply pipe 251 connected to the humidifier 250. The humidification water supply pipe 251 is connected to softened water, and a humidification water supply manual valve 252 for switching the humidifier water supply pipe is also provided thereon. The valve is mainly used to close the humidification water supply when the humidifier 250 and the humidifier water supply regulating valve 524 are overhauled.

[0037] By adjusting the opening of the fresh air unit water supply regulating valve 523 and the humidifier water supply regulating valve 524 of the fresh air unit 200, the indoor humidity can be regulated. For example, for summer working conditions: when the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the humidity can be reduced by opening the fresh air unit water supply regulating valve 523; when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the humidity can be increased by closing the fresh air unit water supply regulating valve 523. In winter, the indoor humidity is regulated by the humidifier water supply regulating valve 524. When the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the humidification water supply regulating valve 524 is closed; conversely, when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the humidification water supply regulating valve 524 is opened.

[0038] In addition, the refrigerant of the surface cooling heater 130 of the air-conditioning unit 100 and the surface cooling heater 240 of the fresh air unit 200 can both use externally provided chilled water with a supply of 7°C and a return of 12°C, and the heat medium can use externally provided hot water with a supply of 60°C and a return of 50°C. The supply and return water temperatures of the refrigerant and heat medium can be adjusted according to actual needs.

[0039] The air supply device 300 can efficiently filter the air sent into the room, and transport and distribute the clean air into the clean space, which includes: a plurality of filtering air supply devices 310 arranged downstream of the air path of the air conditioning unit 100; an air supply pipe 320 connected between the air outlet side of the air conditioning unit 100 and the air inlet side of each filtering air supply device; and an air supply muffler 330 arranged on the air supply main pipe 323. Specifically, the air supply pipe 320 includes an air supply main pipe 323, an air supply main pipe 322 and an air supply branch pipe 321 arranged in sequence along the air supply direction and connected to each other, so as to efficiently filter the air output by the air conditioning unit 100 through the connected filtering air supply device 310 and then transport it to the clean hall. The filtering air supply device 310 includes an air supply port 311 connected to the indoor of the clean hall and a high-efficiency filter 312 connected to the air supply port 311 for efficiently filtering the air flowing through. The high efficiency filter 312 is arranged between the air supply main pipe 322 and the air supply branch pipe 321. In addition, the air supply pipe 320 also includes an air supply valve 324 arranged on the air supply branch pipe 321. By adjusting the opening of the air supply valve 324, the air volume delivered to the filtering air supply device 310 can be controlled, thereby adjusting the air volume delivered to the clean hall, so that the air supply volume of each air supply port in the clean hall is basically the same. As an optional solution, the air supply port 311 can be arranged on the top or side wall of the clean hall.

[0040] The return air and fresh air device 400 is arranged upstream of the gas flow path of the air-conditioning unit 100, and can collect and transport indoor return air and fresh air. It includes a return air duct 410 that introduces return air into the air-conditioning unit 100 and a mixing air duct 420 that mixes outdoor fresh air with the return air in the return air duct and then introduces it into the air-conditioning unit.

[0041] Specifically, the return air duct 410 includes a plurality of return air ports 411 arranged in the clean hall, and a return air duct 412 connected between the return air ports 411 and the air inlet side of the air conditioning unit 100. The return air duct 412 includes a return air branch pipe 4121, a return air main pipe 4122 and a return air main pipe 4123 which are sequentially connected along the air flow direction, and also includes a return air valve 4124 respectively arranged on each return air branch pipe 4121. Among them, the plurality of return air branch pipes 4121 are respectively connected to the plurality of return air ports 411, the return air branch pipes 4121 are arranged between the return air ports 411 and the return air main pipe 4122, and the return air main pipe 4122 is connected to the air conditioning unit 100. As a preferred solution, the return air duct 410 also includes a return air muffler 413, and the return air muffler 413 is preferably arranged on the return air main pipe 4123. The air mixing pipeline 420 includes a bypass pipe 421 for introducing indoor return air into the fresh air inlet pipe 432.

[0042] In addition, the return air fresh air device 400 further includes a fresh air pipeline 430, which includes: a fresh air outlet 431 arranged outside the clean hall, a fresh air inlet pipe 432 and a fresh air inlet pipe 434 sequentially connected between the fresh air outlet 431 and the air inlet side of the fresh air unit 200 along the air flow direction. In addition, as a preferred solution, the fresh air pipeline 430 further includes a fresh air muffler 433 arranged on the fresh air inlet pipe 434. In addition, the bypass pipe 421 is connected between the fresh air inlet pipe 432 and the return air main pipe 4123.

[0043] The measurement and control system 500 is capable of measuring, displaying and regulating air conditioning environmental parameters. Specifically, the measurement device 510 of the measurement and control system 500 includes: a fresh air inlet temperature and humidity sensor 517 arranged on the air inlet side of the fresh air unit 200, which is used to measure the temperature and humidity of the outdoor fresh air; a fresh air outlet temperature sensor 518 arranged on the air outlet side of the fresh air unit 200, which is used to measure the outlet temperature of the fresh air unit 200; an air conditioning supply air temperature and humidity sensor 519 arranged on the air outlet side of the air conditioning unit 100, which is used to measure the outlet temperature and humidity of the air conditioning unit 100. In addition, the measurement device 510 also includes an indoor air temperature and humidity sensor 513 arranged in the clean hall, which is used to measure the indoor temperature and humidity of the clean hall; a particle concentration sensor 511, which is used to measure the particle concentration in the air in the clean hall, and an indoor positive pressure sensor 512, which is used to measure the indoor positive pressure of the clean hall.

[0044] The control device 520 of the measurement and control system 500 includes: a control cabinet 521 arranged in the air-conditioning room, an air-conditioning unit water supply regulating valve 522 arranged on the air-conditioning water supply pipe 131 of the air-conditioning unit 100, a fresh air unit water supply regulating valve 523 arranged on the air-conditioning water supply pipe 243 of the fresh air unit 200, a humidifier water supply regulating valve 524 arranged on the humidification water supply pipe 251 of the humidifier 250 of the fresh air unit 200, a return air bypass regulating valve 525 arranged on the bypass pipe 421 and a fresh air inlet electric valve 526 on the fresh air inlet pipe 432. The air conditioning unit water supply regulating valve 522 is used to regulate the water supply flow of the air conditioning water supply pipe 131 of the air conditioning unit 100; the fresh air unit water supply regulating valve 523 is used to regulate the water supply flow of the air conditioning water supply pipe 243 of the fresh air unit 200; the humidifier water supply regulating valve 524 is used to regulate the humidification amount of the humidifier 250 of the fresh air unit 200; the return air bypass regulating valve 525 is used to regulate the return air volume of the indoor return air delivered to the inlet of the fresh air unit 200 through the bypass pipe 421; the fresh air inlet electric valve 526 is used to regulate the air volume of outdoor fresh air entering the fresh air unit 200.

[0045] The control cabinet 521 has a display screen and an operation keyboard, which can display and adjust environmental parameters and / or working parameters. In addition, the operation keyboard can be integrated with the display screen.

[0046] The control device 520 controls the operating frequency of the air conditioning fan 120 according to the indoor cleanliness detected by the particle concentration sensor 511, and takes the median value of the air particle concentration that meets the predetermined cleanliness as the control target value. When the particle concentration detected by the particle concentration sensor 511 is higher than the control target value and exceeds the set deviation value, the control device 520 controls to increase the operating frequency of the air conditioning fan 120 to increase the purified air volume; and when the indoor cleanliness detected by the particle concentration sensor 511 is lower than the control target value and exceeds the set deviation value, the control device 520 controls to reduce the operating frequency of the air conditioning fan 120 to reduce the purified air volume, thereby achieving the energy-saving effect of reducing operating energy consumption.

[0047] The control device 520 controls the operating frequency of the fresh air fan 230 according to the indoor positive pressure detected by the indoor positive pressure sensor 512. When the indoor positive pressure is higher than the set value and exceeds the set deviation value, the control device 520 lowers the operating frequency of the fresh air fan 230 to reduce the fresh air volume, but controls the frequency of the fresh air fan 230 to be not less than 30Hz to ensure the minimum fresh air volume. When the indoor positive pressure is lower than the set value and exceeds a certain deviation value, the operating frequency of the fresh air fan 230 is increased to increase the fresh air volume.

[0048] The control device 520 also controls the opening of the return air bypass regulating valve 525 according to the indoor positive pressure detected by the indoor positive pressure sensor 512. When the amount of fresh air required to maintain the indoor positive pressure is too small to affect the independent control of the indoor humidity, the control is performed to open the return air bypass regulating valve 525 to change the fresh air unit 200 from the unit's full air processing condition to a mixed air processing condition of fresh air and return air.

[0049] The following describes the automatic monitoring, judgment and automatic control method of the air conditioning purification system according to the present invention when there is a contradiction between dehumidification control and positive pressure control. Specifically, the control device 520 can control the opening of the return air bypass regulating valve 525 and the fresh air inlet electric valve 526 according to the indoor humidity detected by the indoor air temperature and humidity sensor 513. For example, under summer conditions, when the air conditioning water supply regulating valve 523 of the fresh air unit 200 is opened to the maximum and the indoor humidity continues to increase, this indicates that there is a contradiction between dehumidification control and positive pressure control. The control device controls to open the return air bypass regulating valve 525 and simultaneously close the fresh air inlet electric valve 526 until the opening of the fresh air bypass valve is stopped when it is detected that the indoor humidity begins to decrease. In winter conditions, when the humidifier water supply regulating valve 524 of the fresh air unit 200 is opened to the maximum and the indoor humidity continues to decrease, it indicates that there is a contradiction between the dehumidification control and the positive pressure control. The control device 520 controls to open the return air bypass regulating valve 525 and simultaneously close the fresh air inlet electric valve 526 until the indoor humidity begins to increase, and then stops adjusting the return air bypass regulating valve 525, and controls the humidity by controlling the opening of the humidifier water supply regulating valve 524 of the fresh air unit 200. If the indoor positive pressure detected by the indoor positive pressure sensor 512 is still lower than the design value and continues to decrease when the fresh air fan frequency of the fresh air unit 200 is adjusted to the working frequency, the control device 520 closes the return air bypass regulating valve 525 and simultaneously opens the fresh air inlet electric valve 526 until the indoor positive pressure begins to increase and exceeds the design value.

[0050] As a preferred solution, the indoor air temperature and humidity sensor 513, the particle concentration sensor 511 and the indoor positive pressure sensor 512 can all have the function of displaying the detected environmental parameters. The above sensors can be set at a height of 1.2m to 1.8m from the ground for easy observation. As an optional solution, multiple sensors can be set at different locations, and the average value of the detection results can be taken for regulation.

[0051] In addition, when the clean workshop stops operating, the fresh air inlet electric valve 526 can be closed to maintain the indoor air-conditioned clean environment, thereby reducing energy consumption.

[0052] In summary, the air conditioning purification system provided according to the present invention solves the decoupling problem of independent control of the four parameters of indoor temperature, humidity, cleanliness and positive pressure in the clean hall, especially the decoupling problem of the contradiction between humidity control and positive pressure control when the fresh air volume in the clean hall is too small, improves the control accuracy of the four indoor environmental parameters, reduces the circulating air volume and fresh air volume of air conditioning purification as much as possible, and does not have the problem of cold and heat offset by electric heating for reheating, thereby greatly reducing the operating energy consumption of the air conditioning purification system.

[0053] Although the present invention has been described above with reference to exemplary embodiments, the above embodiments are only for illustrating the technical concept and features of the present invention and cannot be used to limit the protection scope of the present invention. Any equivalent variations or modifications made according to the spirit and essence of the present invention should be included in the protection scope of the present invention.

[0054] Description of reference numerals:

[0055] 10. Air conditioning purification system;

[0056] 100 air conditioning units;

[0057] 110 air conditioning box;

[0058] 120 air conditioning fan;

[0059] 130 Air conditioning unit surface cooling heater;

[0060] 131 Air conditioning water supply pipe of air conditioning unit;

[0061] 132 Air conditioning unit air conditioning water supply manual valve;

[0062] 133 Air conditioning unit air conditioning return pipe;

[0063] 134 Air conditioning unit air conditioning return water manual valve;

[0064] 140 medium efficiency filter;

[0065] 150 Air inlet duct of air conditioning unit;

[0066] 200 fresh air units;

[0067] 210 fresh air box;

[0068] 220 coarse filter;

[0069] 230 Fresh air fan;

[0070] 240 Fresh air unit surface cooling heater;

[0071] 241 Manual valve for air conditioning water supply of fresh air unit;

[0072] 242 Fresh air unit air conditioning return pipe;

[0073] 243 Fresh air unit air conditioning water supply pipe;

[0074] 244 Fresh air unit air conditioning return water manual valve;

[0075] 250 Humidifier;

[0076] 251 Humidification water supply pipe;

[0077] 252 Humidification water supply manual valve;

[0078] 300 air supply device;

[0079] 310 Filter air supply device;

[0080] 311 air outlet;

[0081] 312 HEPA filter;

[0082] 320 air supply duct;

[0083] 321 air supply branch pipe;

[0084] 322 air supply main;

[0085] 323 air supply main;

[0086] 324 air supply valve;

[0087] 330 air supply muffler;

[0088] 400 Return air and fresh air device;

[0089] 410 return air duct;

[0090] 411 return air vent;

[0091] 412 return air duct

[0092] 4121 Return air branch pipe;

[0093] 4122 Return air main;

[0094] 4123 Return air main;

[0095] 4124 Return air valve;

[0096] 413 Return air silencer;

[0097] 420 air mixing line;

[0098] 421 bypass pipe;

[0099] 430 Fresh air duct;

[0100] 431 New outlet;

[0101] 432 Fresh air inlet duct;

[0102] 433 Fresh air muffler;

[0103] 434 Fresh air inlet duct;

[0104] 500 measurement and control system;

[0105] 510 Measuring device;

[0106] 511 particle concentration sensor;

[0107] 512 indoor positive pressure sensor;

[0108] 513 Indoor air temperature and humidity sensor;

[0109] 517 Fresh air inlet temperature and humidity sensor;

[0110] 518 Fresh air outlet temperature sensor;

[0111] 519 air conditioning supply air temperature and humidity sensor;

[0112] 520 Control device;

[0113] 521 control cabinet;

[0114] 522 Air conditioning unit water supply regulating valve;

[0115] 523 Fresh air unit water supply regulating valve;

[0116] 524 Humidifier water supply regulating valve;

[0117] 525 Return air bypass regulating valve;

[0118] 526 Fresh air inlet electric valve.

Claims

1. An air conditioning purification system for a clean room, the air conditioning purification system (10) comprising a fresh air unit (200) arranged in sequence according to the air flow direction for coarse filtering of outdoor fresh air and independently adjusting indoor humidity and indoor positive pressure, an air conditioning unit (100) for medium filtering of air flowing through and independently adjusting indoor temperature and cleanliness, and an air supply device (300) for supplying air conditioned and purified by the air conditioning unit to the clean room and performing high-efficiency filtration, wherein: The air conditioning purification system also includes: A return air fresh air device (400) arranged upstream of the gas flow path of the air conditioning unit comprises a return air duct (410) for introducing indoor air into the air conditioning unit and a mixing air duct (420) for mixing outdoor fresh air with return air in the return air duct and then introducing the mixed air into the air conditioning unit, and The measurement and control system (500) comprises a measuring device (510) for measuring the environmental parameters of the clean room and the working parameters of the air conditioning purification system, and a control device (520) for controlling the working parameters of the air conditioning purification system according to the measurement results. The environmental parameters include indoor air temperature, humidity, particle concentration and indoor positive pressure, and the operating parameters include fan operating frequency and valve opening.

2. The air conditioning purification system according to claim 1, wherein: The return air pipeline of the return air fresh air device includes a return air port (411) arranged in the clean room and a return air duct (412) connected between the return air port and the air inlet side of the air conditioning unit, and The mixed air pipeline of the return air and fresh air device includes a bypass pipe (421) for introducing indoor return air into the inlet of the fresh air unit.

3. The air conditioning purification system according to claim 1 or 2, wherein: The fresh air unit comprises: a fresh air box (210), a coarse-effect filter (220) arranged in sequence in the fresh air box according to the air flow direction, a fresh air fan (230) for driving air flow, a fresh air unit surface cooling heater (240) for adjusting air temperature, and a humidifier (250) for increasing air humidity; The air conditioning unit comprises: an air conditioning box (110), an air conditioning fan (120) arranged in sequence in the box according to the air flow direction for driving air circulation, an air conditioning unit surface cooling heater (130) for adjusting the air temperature, and a medium efficiency filter (140) for performing medium efficiency filtering on the gas flowing through; The air supply device (300) comprises: a plurality of filtering air supply devices (310) arranged downstream of the air path of the air conditioning unit, and an air supply pipe (320) connected between the air outlet side of the air conditioning unit and the air inlet side of each filtering air supply device (310).

4. The air conditioning purification system according to claim 3, wherein: The return air fresh air device also includes a fresh air pipeline (430), which includes: a fresh air outlet (431) arranged outside the clean hall and a fresh air inlet pipe (432) connected between the fresh air outlet and the air inlet side of the fresh air unit.

5. The air conditioning purification system according to claim 4, wherein: The measuring device of the measuring and controlling device comprises: a fresh air inlet temperature and humidity sensor (517) arranged at the air inlet side of the fresh air unit, a fresh air outlet temperature sensor (518) at the air outlet side of the fresh air unit, an air conditioning supply air temperature and humidity sensor (519) at the air outlet side of the air conditioning unit, and an indoor air temperature and humidity sensor (513), a particle concentration sensor (511) and an indoor positive pressure sensor (512) arranged in the clean hall; The control device of the measurement and control device comprises: a control cabinet (521) arranged in the air conditioning room of the hall, an air conditioning unit water supply regulating valve (522), a fresh air unit water supply regulating valve (523), a humidifier water supply regulating valve (524), a return air bypass regulating valve (525) on the bypass pipe, and a fresh air inlet electric valve (526) on the fresh air inlet pipe.

6. The air conditioning purification system according to claim 5, wherein: The air-conditioning fan of the air-conditioning unit is a variable frequency centrifugal fan. The control device controls the operating frequency of the air-conditioning fan according to the indoor cleanliness detected by the indoor particle concentration sensor, and takes the median value of the particle concentration that meets the predetermined cleanliness as the control target value. Among them, when the particle concentration detected by the indoor particle concentration sensor is higher than the control target value and exceeds the set deviation value, the control device controls to increase the operating frequency of the air-conditioning fan to increase the purified air volume; and when the indoor cleanliness detected by the indoor particle concentration sensor is lower than the control target value and exceeds the set deviation value, the control device controls to lower the operating frequency of the air-conditioning fan to reduce the purified air volume.

7. The air conditioning purification system according to claim 5, wherein: The fresh air fan of the fresh air unit is a variable frequency centrifugal fan. The control device controls the operating frequency of the fresh air fan according to the indoor positive pressure detected by the indoor positive pressure sensor. Among them, when the indoor positive pressure is higher than the set value and exceeds the set deviation value, the control device lowers the operating frequency of the fresh air fan to reduce the fresh air volume; when the indoor positive pressure is lower than the set value and exceeds a certain deviation value, the control device increases the operating frequency of the fresh air fan to increase the fresh air volume.

8. The air conditioning purification system according to claim 5, wherein: The control device controls the air conditioning water supply regulating valve and the humidification water supply regulating valve of the fresh air unit according to the indoor humidity detected by the indoor temperature and humidity sensor by adjusting the opening of the air conditioning water supply regulating valve and the humidification water supply regulating valve of the fresh air unit in the following manner to control the indoor humidity: For summer conditions: when the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the air conditioning water supply regulating valve is opened to reduce the humidity; and when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the air conditioning water supply regulating valve is closed to increase the humidity. For winter working conditions: when the indoor relative humidity is higher than the set value and exceeds a certain deviation value, the humidification water supply regulating valve is closed; and when the indoor relative humidity is lower than the set value and exceeds a certain deviation value, the humidification water supply regulating valve is opened.

9. The air conditioning purification system according to claim 8, wherein: The control device controls the opening of the fresh air bypass regulating valve and the fresh air inlet electric valve according to the indoor humidity detected by the indoor temperature and humidity sensor in the following manner: In summer, when the air conditioning water supply regulating valve of the fresh air unit is opened to the maximum and the indoor humidity continues to increase, the control device controls to open the return air bypass valve and simultaneously close the fresh air inlet electric valve, so that the fresh air unit changes from a fresh air processing condition to a mixed air processing condition of fresh air and return air. When the indoor humidity begins to decrease, the return air bypass valve is stopped from being adjusted, and the humidity is adjusted only by controlling the opening of the air conditioning water supply valve of the fresh air unit. Under winter conditions, when the manual humidification water supply valve of the fresh air unit is opened to the maximum and the indoor humidity continues to decrease, the control device controls to open the return air bypass valve and simultaneously close the fresh air inlet electric valve until the indoor humidity begins to increase. The return air bypass valve is then stopped and humidity is adjusted only by controlling the opening of the humidification water supply valve of the fresh air unit.

10. The air conditioning purification system according to claim 7, wherein: If the indoor positive pressure detected by the indoor positive pressure sensor is still lower than the set value and continues to decrease when the fresh air fan frequency of the fresh air unit is adjusted to the working frequency, the control device will close the fresh air bypass valve and simultaneously open the fresh air inlet valve until the indoor positive pressure begins to increase and is higher than the set value.

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