A high-stability two-stage series fan purification control system for pharmaceutical factories

Abstract

The present invention proposes a high-stability two-stage series fan purification control system for a pharmaceutical factory, comprising: a first fresh air unit and a second air unit, wherein the air outlet section of the first fresh air unit is connected to the air supply port of the pharmaceutical factory operation room, the first fresh air unit is used to supply air to the pharmaceutical factory operation room, the air outlet of the pharmaceutical factory operation room is connected to the air inlet of the second air unit, the air outlet of the second air unit is connected to the return air port of the first fresh air unit, the second air unit is used to return air to the operation room, a wind speed sensor is arranged on the second air unit for controlling the return air volume of the second air unit, and an air supply pressure sensor is arranged on the first fresh air unit for controlling the supply air volume of the first fresh air unit, and the pressure difference stability of the pharmaceutical factory operation room is achieved by controlling the balance between the supply air volume and the return air volume.

Description

Technical Field

[0001] The technical field of the air conditioning control system of the present invention, more specifically, relates to a high-stability two-stage series fan purification control system for a pharmaceutical factory. Background Art

[0002] The quality of the drug production process is closely related to the pressure difference, temperature and humidity of each production workshop in the pharmaceutical factory. In particular, the quality and efficacy of some important special drugs will be seriously affected once the pressure difference is out of control. At present, the timely and effective adjustment system is related to the temperature and humidity control of the pharmaceutical factory. There is no corresponding treatment measure for the pressure difference. However, how to quickly and accurately automatically detect the pressure difference of the pharmaceutical factory is of great significance to improving the quality of drugs.

[0003] The existing patent (publication number: CN112286131B) uses MAU control to control the temperature in the room. However, for pharmaceutical factories, it is more necessary to ensure the stability of the pressure difference in the room when making medicines. This technology is not applicable to the pharmaceutical factory environment.

[0004] Publication number: CN112286131B, a MAU control system and an electronic clean room MAU high-precision control method, the present invention relates to the field of MAU high-precision control technology, specifically to a MAU control system and an electronic clean delivery room MAU high-precision control method, aiming to solve the problem that the load formation of medium and low temperature water cannot be actively and flexibly adjusted in the prior art, the MAU control system includes a number of MAU units and a PLC control system, the MAU control system includes a number of air collecting pipes and air collecting pipe pressure difference sensors, the MAU units include outdoor temperature and humidity sensors, humidifying discs, variable frequency fans and air outlet temperature and humidity sensors arranged in sequence, the outdoor temperature and humidity sensors are arranged outside the air inlet, the air outlet is connected to the air collecting pipe, the air collecting pipe pressure difference sensor is arranged between adjacent MAU units, the MAU units also include a number of temperature control water pipes, and the temperature control water pipes are provided with regulating valves for controlling water flow. The electronic clean delivery room MAU high-precision control method uses the above-mentioned MAU control system for control.

[0005] In view of this, the present invention proposes a high-stability two-stage series fan purification control system for pharmaceutical factories with a balancing function of controlling the supply air volume and the return air volume. Summary of the invention

[0006] In view of this, in order to solve the problem of the existing air conditioning system suitable for stabilizing the pressure difference of pharmaceutical factories, the present invention proposes a high-stability two-stage series fan purification control system for pharmaceutical factories.

[0007] A high-stability two-stage series fan purification control system for a pharmaceutical factory, comprising: a high-stability two-stage series fan purification control system for a pharmaceutical factory, comprising: a first fresh air unit 1 and a second air unit 2, the air outlet section of the first fresh air unit 1 is connected to the air supply port of a pharmaceutical factory operation room 23, the first fresh air unit 1 is used to supply air to the pharmaceutical factory operation room 23, the air outlet of the pharmaceutical factory operation room 23 is connected to the air inlet of the second air unit 2, the air outlet of the second air unit 2 is connected to the return air port of the first fresh air unit 1, the second air unit 2 is used to return air to the operation room, a wind speed sensor 29 is provided on the second air unit 2, which is used to control the return air volume of the second air unit 2, and an air supply pressure sensor 21 is provided on the air outlet section of the first fresh air unit 1, which is used to control the air supply volume of the first fresh air unit 1, and the pressure difference stability of the pharmaceutical factory operation room is achieved by controlling the balance between the supply air volume and the return air volume.

[0008] Furthermore, the first fresh air unit 1 is provided with a first air inlet section 10, a first medium efficiency filter 11, a first steam heater 12, a first surface cooler 13, a second air inlet section 14, a second surface cooler 15, a second steam heater 16, a steam humidifier 17, a primary fan 18, a second medium efficiency filter 19 and an air outlet section from right to left. The first surface cooler 13 is provided with a dehumidification electric valve 131, the second surface cooler 15 is provided with a cooling electric valve 151, the second steam heater 16 is provided with a heating electric valve 161, the steam humidifier 17 is provided with a humidification electric valve 171, and the first fresh air unit 1 is connected in series with the second air unit 2.

[0009] Furthermore, a 40-mesh filter 101 is provided at the input end of the first air inlet section 10 of the first fresh air unit 1, and a fresh air temperature sensor 102 is provided at the input end of the 40-mesh filter 101 for measuring the outdoor temperature. A fresh air electric valve 103 and a first manual regulating valve 104 are provided at the input end of the first air inlet section 10 for controlling the initial state of the air-conditioning system. A second manual regulating valve 105 is provided at the output end of the first fresh air unit 1. The input end of the first steam heater 12 is connected to a preheating electric valve 121 and a steam pipe 4. The output end of the first steam heater 12 is connected to a steam condensate removal main pipe 5. When the outdoor temperature measured by the fresh air temperature sensor 102 is lower than 5°C, the preheating electric valve 121 is opened for preheating treatment.

[0010] Furthermore, the input end of the first cooler 13 is connected to the cold water supply pipe 6, the output end of the first cooler 13 is connected to the dehumidification electric valve 131 and the cold water return pipe 7, the input end of the second cooler 15 is connected to the cold water supply pipe 6, the output end of the second cooler 15 is connected to the cooling electric valve 151 and the cold water return pipe 7, the input end of the second steam heater 16 is connected to the heating electric valve 161 and the steam pipe 4, the output end of the second steam heater 16 is connected to the steam condensate removal main pipe 5, the steam humidifier 17 is connected to the dry steam humidifier, the input end of the dry steam humidifier is connected to the humidification electric valve 171 and the steam pipe 4, and the output end of the dry steam humidifier is connected to the steam condensate removal main pipe 5.

[0011] Furthermore, a third medium-efficiency filter 26, a wind speed sensor 29, a high-efficiency filter 27 and a secondary fan 28 are sequentially arranged in the second fan unit 2, an air supply pressure sensor 21 and a dew point sensor 22 are arranged on the pipeline connecting the first fresh air unit 1 and the pharmaceutical factory operation room 23, and a humidity sensor 24 and a temperature sensor 25 are arranged on the pipeline connecting the second fan unit 2 and the pharmaceutical factory operation room 23.

[0012] Furthermore, the air supply pressure sensor 21 measures the static pressure, which is used to control the air supply frequency of the primary fan 18, and then controls the air supply volume. The dew point sensor 22 is used to measure the dew point temperature of the first fresh air unit 1, and control the humidification electric valve 171 and the dehumidification electric valve 131. The dew point value is set before measurement. When the measured temperature is lower than the dew point value, the humidification electric valve 171 is enabled; when the measured temperature is higher than the dew point value, the dehumidification electric valve 131 is enabled. The humidity sensor 24 is used to monitor the state of the pharmaceutical factory operation room 23, and does not participate in the control. The temperature sensor 24 is used to monitor the state of the pharmaceutical factory operation room 23, and does not participate in the control. The temperature sensor 25 measures the return air temperature of the pharmaceutical factory operation room 23, and controls the heating electric valve 161 and the cooling electric valve 151. When the measured temperature is lower than the actual temperature of the pharmaceutical factory operation room 23, the heating electric valve 161 is opened. When the measured temperature is higher than the actual temperature of the pharmaceutical factory operation room 23, the low-temperature electric valve is opened. A wind speed sensor 29 is provided between the third medium-efficiency filter 26 and the high-efficiency filter 27 to measure the relatively stable airflow speed between the two filters and control the fan frequency of the secondary fan 28, thereby controlling the return air volume.

[0013] Furthermore, an air supply duct 201 is provided at the output end of the secondary fan 28, and the output end of the air supply duct 201 is connected to the return air duct 202 and the exhaust main duct 203. The output end of the return air duct 202 is connected to the second air inlet section 14 of the first fresh air unit 1, and a third manual regulating valve 204 is provided at the output end of the return air duct 202. A first disinfection exhaust switching valve 205 is provided at the input end of the return air duct 202. A first exhaust duct 206 is provided at the middle end of the exhaust main duct 203 in parallel with a second exhaust duct 207. A fourth manual regulating valve 208 is provided on the first exhaust duct 206, and a second disinfection exhaust switching valve 209 is provided on the second exhaust duct 207. An exhaust pressure sensor 301 and a fifth manual regulating valve 302 are provided at the output end of the exhaust main duct 203.

[0014] Furthermore, the output end of the exhaust main duct 203 is connected to the input end of the exhaust fan unit 3, and the fourth medium-efficiency filter 31 and the exhaust fan 32 are arranged in the exhaust fan unit 3 from left to right. The exhaust pressure sensor 301 measures the static pressure and is used to control the exhaust frequency of the exhaust fan 32.

[0015] Furthermore, the first medium efficiency filter 11, the second medium efficiency filter 19, the third medium efficiency filter 26, the fourth medium efficiency filter 31 and the high efficiency filter 27 are all provided with a differential pressure sensor 8 for prompting an alarm for filter replacement.

[0016] Furthermore, the pipe grade of the steam pipe 4 is STM, the internal pressure of the pipe is 0.2 MPa, the water temperature of the cold water supply pipe 6 is 7°C, and the water temperature of the cold water return pipe 7 is 12°C.

[0017] Beneficial effects of the present invention: The present invention proposes a high-stability two-stage series fan purification control system for a pharmaceutical factory, which includes: a first fresh air unit 1 and a second air unit 2, the air outlet section of the first fresh air unit 1 is connected to the air supply port of the pharmaceutical factory operation room 23, the first fresh air unit 1 is used to supply air to the pharmaceutical factory operation room 23, the air outlet of the pharmaceutical factory operation room 23 is connected to the air inlet of the second air unit 2, the air outlet of the second air unit 2 is connected to the return air port of the first fresh air unit 1, the second air unit 2 is used to return air to the operation room, a wind speed sensor 29 is arranged on the second air unit 2, which is used to control the return air volume of the second air unit 2, and an air supply pressure sensor 21 is arranged on the first fresh air unit 1, which is used to control the supply air volume of the first fresh air unit 1, and the pressure difference stability of the pharmaceutical factory operation room is achieved by controlling the balance between the supply air volume and the return air volume.

[0018] The working principle of the present invention is as follows: when the air conditioning system is turned on in the normal air supply mode, the fresh air electric valve 103, the first manual regulating valve 104, the second manual regulating valve 105, the third manual regulating valve 204, the first disinfection exhaust switching valve 205, the fourth manual regulating valve 208 and the fifth manual regulating valve 302 are opened, and the first fresh air unit 1 starts to supply air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to send part of the air back to the first fresh air unit 1 through the return air duct 202 for return air, and transports the other part of the air through the first exhaust duct 206 in the exhaust main duct 203 to the exhaust unit 3 for exhaust treatment under normal conditions; when the air conditioning system is turned on in the disinfection exhaust mode, the fresh air electric valve 103, the first manual regulating valve 104, the second manual regulating valve 105, the third manual regulating valve 204, the first disinfection exhaust switching valve 205, the fourth manual regulating valve 208 and the fifth manual regulating valve 302 are opened, and the first fresh air unit 1 starts to supply air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to send part of the air back to the first fresh air unit 1 through the return air duct 202 for return air, and transports the other part of the air to the exhaust unit 3 through the first exhaust duct 206 in the exhaust main duct 203 for exhaust treatment under normal conditions. A manual regulating valve 104, a second manual regulating valve 105, a fourth manual regulating valve 208, a fifth manual regulating valve 302, and a second disinfection exhaust switching valve 209 are used to close the third manual regulating valve 204 and the first disinfection exhaust switching valve 205, thereby blocking the return air path of the secondary fan 28. The first fresh air unit 1 normally supplies air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to transport all indoor air through the supply air duct 201 to the exhaust main duct 203. On the exhaust main duct 203, part of the air is transported to the exhaust unit 3 through the first exhaust duct 206, and the other part of the air is transported to the exhaust unit 3 through the second exhaust duct 207. The exhaust duct transportation duct is increased to achieve the effect of increasing the exhaust volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the high-stability two-stage series fan purification control system used in a pharmaceutical factory according to the present invention.

[0020] Figure 2 It is a schematic diagram of the partial structure of the first fresh air unit of the high-stability two-stage series fan purification control system for a pharmaceutical factory of the present invention.

[0021] Figure 3 It is a schematic diagram of the partial structure of the first fresh air unit of the high-stability two-stage series fan purification control system for a pharmaceutical factory of the present invention.

[0022] Figure 4 It is a partial structural schematic diagram of the second fan unit of the high-stability two-stage series fan purification control system for pharmaceutical factories of the present invention.

[0023] Figure 5 It is a schematic diagram of the partial structure of the exhaust fan unit of the high-stability two-stage series fan purification control system used in pharmaceutical factories of the present invention.

[0024] Main component symbols

[0025]

[0026]

[0027] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the structure of a high-stability two-stage series fan purification control system for a pharmaceutical factory according to the present invention. Figure 2 As shown in FIG. 1 , it is a partial structural schematic diagram of a high-stability two-stage series fan purification control system for a pharmaceutical factory according to the present invention, as shown in FIG. Figure 3 FIG. 1 is a partial structural diagram of the first fresh air unit of the high-stability two-stage series fan purification control system for a pharmaceutical factory according to the present invention. Figure 4 FIG. 1 is a partial structural diagram of the second fan unit of the high-stability two-stage series fan purification control system for a pharmaceutical factory according to the present invention. Figure 5 The figure shows a partial structural diagram of an exhaust fan unit of a high-stability two-stage series fan purification control system for a pharmaceutical factory according to the present invention.

[0029] A high-stability two-stage series fan purification control system for a pharmaceutical factory comprises: a first fresh air unit 1 and a second air unit 2, wherein the air outlet section of the first fresh air unit 1 is connected to the air supply port of an operation room 23 of the pharmaceutical factory, the first fresh air unit 1 is used to supply air to the operation room 23 of the pharmaceutical factory, the air outlet of the operation room 23 of the pharmaceutical factory is connected to the air inlet of the second air unit 2, the air outlet of the second air unit 2 is connected to the return air port of the first fresh air unit 1, the second air unit 2 is used to return air to the operation room, a wind speed sensor 29 is arranged on the second air unit 2 for controlling the return air volume of the second air unit 2, and an air supply pressure sensor 21 is arranged on the air outlet section of the first fresh air unit 1 for controlling the supply air volume of the first fresh air unit 1, and the pressure difference stability of the operation room of the pharmaceutical factory is achieved by controlling the balance between the supply air volume and the return air volume.

[0030] The first fresh air unit 1 is provided with a first air inlet section 10, a first medium efficiency filter 11, a first steam heater 12, a first surface cooler 13, a second air inlet section 14, a second surface cooler 15, a second steam heater 16, a steam humidifier 17, a primary fan 18, a second medium efficiency filter 19 and an air outlet section from right to left. The first surface cooler 13 is provided with a dehumidification electric valve 131, the second surface cooler 15 is provided with a cooling electric valve 151, the second steam heater 16 is provided with a heating electric valve 161, the steam humidifier 17 is provided with a humidification electric valve 171, and the first fresh air unit 1 is connected in series with the second air unit 2.

[0031] A 40-mesh filter 101 is provided at the input end of the first air inlet section 10 of the first fresh air unit 1, and a fresh air temperature sensor 102 is provided at the input end of the 40-mesh filter 101 for measuring the outdoor temperature. A fresh air electric valve 103 and a first manual regulating valve 104 are provided at the input end of the first air inlet section 10 for controlling the initial state of the air-conditioning system. A second manual regulating valve 105 is provided at the output end of the first fresh air unit 1. The input end of the first steam heater 12 is connected to a preheating electric valve 121 and a steam pipe 4, and the output end of the first steam heater 12 is connected to a steam condensate removal main pipe 5. When the outdoor temperature measured by the fresh air temperature sensor 102 is lower than 5°C, the preheating electric valve 121 is opened for preheating treatment.

[0032] The input end of the first cooler 13 is connected to the cold water supply pipe 6, the output end of the first cooler 13 is connected to the dehumidification electric valve 131 and the cold water return pipe 7, the input end of the second cooler 15 is connected to the cold water supply pipe 6, the output end of the second cooler 15 is connected to the cooling electric valve 151 and the cold water return pipe 7, the input end of the second steam heater 16 is connected to the heating electric valve 161 and the steam pipe 4, the output end of the second steam heater 16 is connected to the steam condensate removal main pipe 5, the steam humidifier 17 is connected to the dry steam humidifier, the input end of the dry steam humidifier is connected to the humidification electric valve 171 and the steam pipe 4, and the output end of the dry steam humidifier is connected to the steam condensate removal main pipe 5.

[0033] A third medium-efficiency filter 26, a wind speed sensor 29, a high-efficiency filter 27 and a secondary fan 28 are sequentially arranged in the second air unit 2; an air supply pressure sensor 21 and a dew point sensor 22 are arranged on the pipeline connecting the first fresh air unit 1 and the pharmaceutical factory operation room 23; a humidity sensor 24 and a temperature sensor 25 are arranged on the pipeline connecting the second air unit 2 and the pharmaceutical factory operation room 23.

[0034] The air supply pressure sensor 21 measures the static pressure and is used to control the air supply frequency of the primary fan 18, thereby controlling the air supply volume. The dew point sensor 22 is used to measure the dew point temperature of the first fresh air unit 1, and to control the humidification electric valve 171 and the dehumidification electric valve 131. The dew point value is set before measurement. When the measured temperature is lower than the dew point value, the humidification electric valve 171 is enabled; when the measured temperature is higher than the dew point value, the dehumidification electric valve 131 is enabled. The humidity sensor 24 is used to monitor the status of the pharmaceutical factory operation room 23 and does not participate in the control. The temperature sensor The sensor 25 measures the return air temperature of the pharmaceutical factory operation room 23, and controls the heating electric valve 161 and the cooling electric valve 151. When the measured temperature is lower than the actual temperature of the pharmaceutical factory operation room 23, the heating electric valve 161 is opened. When the measured temperature is higher than the actual temperature of the pharmaceutical factory operation room 23, the low-temperature electric valve is opened. A wind speed sensor 29 is provided between the third medium-efficiency filter 26 and the high-efficiency filter 27 to measure the relatively stable airflow speed between the two filters and control the fan frequency of the secondary fan 28, thereby controlling the return air volume.

[0035] The output end of the secondary fan 28 is provided with an air supply duct 201, and the output end of the air supply duct 201 is connected to the return air duct 202 and the exhaust main duct 203. The output end of the return air duct 202 is connected to the second air inlet section 14 of the first fresh air unit 1. The output end of the return air duct 202 is provided with a third manual regulating valve 204, and the input end of the return air duct 202 is provided with a first disinfection exhaust switching valve 205. The middle end of the exhaust main duct 203 is provided with a first exhaust duct 206 in parallel with a second exhaust duct 207. The first exhaust duct 206 is provided with a fourth manual regulating valve 208, and the second exhaust duct 207 is provided with a second disinfection exhaust switching valve 209. The output end of the exhaust main duct 203 is provided with an exhaust pressure sensor 301 and a fifth manual regulating valve 302.

[0036] The output end of the exhaust main duct 203 is connected to the input end of the exhaust fan unit 3. The fourth medium-efficiency filter 31 and the exhaust fan 32 are arranged in the exhaust fan unit 3 from left to right. The exhaust pressure sensor 301 measures the static pressure and is used to control the exhaust frequency of the exhaust fan 32.

[0037] The first medium efficiency filter 11, the second medium efficiency filter 19, the third medium efficiency filter 26, the fourth medium efficiency filter 31 and the high efficiency filter 27 are all provided with a differential pressure sensor 8 for prompting an alarm for filter replacement.

[0038] The pipe grade of the steam pipe 4 is STM, the internal pressure of the pipe is 0.2 MPa, the water temperature of the cold water supply pipe 6 is 7°C, and the water temperature of the cold water return pipe 7 is 12°C.

[0039] Beneficial effects of the present invention: The present invention proposes a high-stability two-stage series fan purification control system for a pharmaceutical factory, which includes: a first fresh air unit 1 and a second air unit 2, the air outlet section of the first fresh air unit 1 is connected to the air supply port of the pharmaceutical factory operation room 23, the first fresh air unit 1 is used to supply air to the pharmaceutical factory operation room 23, the air outlet of the pharmaceutical factory operation room 23 is connected to the air inlet of the second air unit 2, the air outlet of the second air unit 2 is connected to the return air port of the first fresh air unit 1, the second air unit 2 is used to return air to the operation room, a wind speed sensor 29 is arranged on the second air unit 2, which is used to control the return air volume of the second air unit 2, and an air supply pressure sensor 21 is arranged on the first fresh air unit 1, which is used to control the supply air volume of the first fresh air unit 1, and the pressure difference stability of the pharmaceutical factory operation room is achieved by controlling the balance between the supply air volume and the return air volume.

[0040] The working principle of the present invention is as follows: when the air conditioning system is turned on in the normal air supply mode, the fresh air electric valve 103, the first manual regulating valve 104, the second manual regulating valve 105, the third manual regulating valve 204, the first disinfection exhaust switching valve 205, the fourth manual regulating valve 208 and the fifth manual regulating valve 302 are opened, and the first fresh air unit 1 starts to supply air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to send part of the air back to the first fresh air unit 1 through the return air duct 202 for return air, and transports the other part of the air through the first exhaust duct 206 in the exhaust main duct 203 to the exhaust unit 3 for exhaust treatment under normal conditions; when the air conditioning system is turned on in the disinfection exhaust mode, the fresh air electric valve 103, the first manual regulating valve 104, the second manual regulating valve 105, the third manual regulating valve 204, the first disinfection exhaust switching valve 205, the fourth manual regulating valve 208 and the fifth manual regulating valve 302 are opened, and the first fresh air unit 1 starts to supply air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to send part of the air back to the first fresh air unit 1 through the return air duct 202 for return air, and transports the other part of the air to the exhaust unit 3 through the first exhaust duct 206 in the exhaust main duct 203 for exhaust treatment under normal conditions. A manual regulating valve 104, a second manual regulating valve 105, a fourth manual regulating valve 208, a fifth manual regulating valve 302, and a second disinfection exhaust switching valve 209 are used to close the third manual regulating valve 204 and the first disinfection exhaust switching valve 205, thereby blocking the return air path of the secondary fan 28. The first fresh air unit 1 normally supplies air to the pharmaceutical factory operation room 23. The pharmaceutical factory operation room 23 uses the secondary fan 28 to transport all indoor air through the supply air duct 201 to the exhaust main duct 203. On the exhaust main duct 203, part of the air is transported to the exhaust unit 3 through the first exhaust duct 206, and the other part of the air is transported to the exhaust unit 3 through the second exhaust duct 207. The exhaust duct transportation duct is increased to achieve the effect of increasing the exhaust volume.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-stability two-stage series fan purification control system for a pharmaceutical factory, comprising: The first fresh air unit (1) and the second fresh air unit (2) are characterized in that: the air outlet section of the first fresh air unit (1) is connected to the air supply port of the pharmaceutical factory operation room (23); the first fresh air unit (1) is used to supply air to the pharmaceutical factory operation room (23); the air outlet of the pharmaceutical factory operation room (23) is connected to the air inlet of the second air unit (2); the air outlet of the second air unit (2) is connected to the return air port of the first fresh air unit (1); the second air unit (2) is used to return air to the operation room; a wind speed sensor (29) is provided on the second air unit (2) for controlling the return air volume of the second air unit (2); and a supply air pressure sensor (21) is provided on the first fresh air unit (1) for controlling the supply air volume of the first fresh air unit (1). By controlling the balance between the supply air volume and the return air volume, the pressure difference between the operation rooms of the pharmaceutical factory is stabilized. The first fresh air unit (1) is provided with a first air inlet section (10), a first medium-efficiency filter (11), a first steam heater (12), a first surface cooler (13), a second air inlet section (14), a second surface cooler (15), a second steam heater (16), a steam humidifier (17), a primary fan (18), a second medium-efficiency filter (19) and an air outlet section from right to left. The first surface cooler (13) is provided with a dehumidification electric valve (131), the second surface cooler (15) is provided with a cooling electric valve (151), the second steam heater (16) is provided with a heating electric valve (161), and the steam humidifier (17) is provided with a heating electric valve (161). The air conditioner (17) is provided with a humidifying electric valve (171); the first fresh air unit (1) and the second air unit (2) are connected in series; a 40-mesh filter (101) is provided at the input end of the first air inlet section (10) of the first fresh air unit (1); a fresh air temperature sensor (102) is provided at the input end of the 40-mesh filter (101) for measuring the outdoor temperature; a fresh air electric valve (103) and a first manual regulating valve (104) are provided at the input end of the first air inlet section (10) for controlling the initial state of the air conditioning system; a second manual regulating valve (105) is provided at the output end of the first fresh air unit (1); and the input end of the first steam heater (12) is connected to a preheating electric valve (121) and a steam pipeline (4). The output end of the first steam heater (12) is connected to the steam condensate main pipe (5); when the outdoor temperature measured by the fresh air temperature sensor (102) is lower than 5°C, the preheating electric valve (121) is opened to perform preheating processing; the input end of the first surface cooler (13) is connected to the cold water supply pipe (6); the output end of the first surface cooler (13) is connected to the dehumidification electric valve (131) and the cold water return pipe (7); the input end of the second surface cooler (15) is connected to the cold water supply pipe (6); the output end of the second surface cooler (15) is connected to the cooling electric valve (151) and the cold water return pipe (7); the input end of the second steam heater (16) is connected to the heating electric valve (161) and the steam pipe (4);The output end of the second steam heater (16) is connected to the steam condensate removal main pipe (5), the steam humidifier (17) is connected to the dry steam humidifier, the input end of the dry steam humidifier is connected to the humidification electric valve (171) and the steam pipe (4), the output end of the dry steam humidifier is connected to the steam condensate removal main pipe (5), the second fan unit (2) is provided with a third medium efficiency filter (26), a wind speed sensor (29), a high efficiency filter (27) and a secondary fan (28) in sequence, the pipeline connecting the first fresh air unit (1) and the pharmaceutical factory operation room (23) is provided with an air supply pressure sensor (21) and a dew point sensor (22), and the pipeline connecting the second fan unit (2) and the pharmaceutical factory operation room (23) is provided with a humidity sensor (24). ) and a temperature sensor (25), the air supply pressure sensor (21) measures the static pressure and is used to control the air supply frequency of the primary fan (18), thereby controlling the air supply volume, the dew point sensor (22) is used to measure the dew point temperature of the first fresh air unit (1), and to control the humidification electric valve (171) and the dehumidification electric valve (131), the dew point value is set before measurement, when the measured temperature is lower than the dew point value, the humidification electric valve (171) is enabled; when the measured temperature is higher than the dew point value, the dehumidification electric valve (131) is enabled, the humidity sensor (24) is used to monitor the state of the pharmaceutical factory operation room (23), and does not participate in the control, the temperature sensor (25) measures the return air temperature of the pharmaceutical factory operation room (23), and controls the heating electric valve (161) and The cooling electric valve (151) opens the heating electric valve (161) when the measured temperature is lower than the actual temperature of the pharmaceutical factory operation room (23); and opens the low-temperature electric valve when the measured temperature is higher than the actual temperature of the pharmaceutical factory operation room (23). A wind speed sensor (29) is provided between the third medium-efficiency filter (26) and the high-efficiency filter (27) for measuring the relatively stable air flow speed between the two filters and controlling the fan frequency of the secondary fan (28), thereby controlling the return air volume. An air supply duct (201) is provided at the output end of the secondary fan (28). The output end of the air supply duct (201) is connected to the return air duct (202) and the exhaust main duct (203). The output end of the return air duct (202) is connected to the first fresh air fan. The second air inlet section (14) of the group (1) is provided with a third manual regulating valve (204) at the output end of the return air duct (202), a first disinfection exhaust switching valve (205) is provided at the input end of the return air duct (202), a first exhaust duct (206) is provided at the middle end of the exhaust main duct (203) and is connected in parallel with a second exhaust duct (207), a fourth manual regulating valve (208) is provided on the first exhaust duct (206), and a second disinfection exhaust switching valve (209) is provided on the second exhaust duct (207), an exhaust pressure sensor (301) and a fifth manual regulating valve (302) are provided at the output end of the exhaust main duct (203), and the output end of the exhaust main duct (203) is connected to the input end of the exhaust unit (3),The exhaust fan unit (3) is provided with a fourth medium-efficiency filter (31) and an exhaust fan (32) in sequence from left to right, and the exhaust pressure sensor (301) measures the static pressure and is used to control the exhaust frequency of the exhaust fan (32).

2. The high-stability two-stage series fan purification control system for a pharmaceutical factory as claimed in claim 1, characterized in that: The first medium efficiency filter (11), the second medium efficiency filter (19), the third medium efficiency filter (26), the fourth medium efficiency filter (31) and the high efficiency filter (27) are all provided with a pressure difference sensor (8) for prompting an alarm for filter replacement.

3. The high-stability two-stage series fan purification control system for a pharmaceutical factory as claimed in claim 1, characterized in that: The pipe grade of the steam pipe (4) is STM, the internal pressure of the pipe is 0.2 MPa, the water temperature of the cold water supply pipe (6) is 7° C., and the water temperature of the cold water return pipe (7) is 12° C.

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