A positive and negative pressure ventilation wheel-driven IVC system and a control method thereof

Abstract

The present application relates to the technical field of heating, ventilation and water systems, and particularly relates to a positive pressure and negative pressure ventilation wheel dynamic IVC system and a control method thereof, which can realize the expected effect of the IVC system through a single fan, simplify the control system, reduce the manufacturing cost, and greatly reduce the difficulty of debugging, installation and performance verification; can realize independent control of the pressure difference of all IVC cages, and can independently correct the pressure difference when there is a pressure deviation between adjacent IVC cages; can automatically switch the IVC cage to be in a positive pressure state or a negative pressure state according to the experimental type of laboratory staff, without the need to set two sets of IVC systems with different pressure intervals, greatly reducing the laboratory construction cost; for example, the attack of large and small mice needs to be bred in a negative pressure IVC cage to prevent the diffusion of toxic substances through the air to the breeding room, causing batch experimental animals to be infected; non-attack of large and small mice needs to be bred in a positive pressure IVC cage to prevent external air from penetrating into the IVC cage and avoid the contamination of experimental animals.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of experimental animal breeding, in particular to a positive pressure and negative pressure ventilation rotating IVC system and a control method thereof. BACKGROUND

[0002] According to the national standard "Experimental Animal Environment and Facilities" (GB14925-2023), specific pathogen free (SPF) level experimental animals need to be bred in a barrier environment. The air cleanliness of the barrier environment is required to be ISO7 level, the minimum air exchange frequency of the independent ventilation cage (IVC) should not be less than 20 times / hour, the ammonia concentration is less than or equal to 14mg / m3, the static pressure difference of adjacent rooms is greater than or equal to 10Pa, the pressure difference of adjacent IVC cages should be the same, the temperature is 20-26℃, and the relative humidity is 30-70%. The IVC system is generally installed in a constant temperature and humidity breeding room, and the air temperature and humidity are controlled by the air conditioning unit matched with the breeding room, without the need for the IVC system to provide cold or heat input.

[0003] At present, the IVC system cannot realize independent control of the pressure difference of all IVC cages, and there is a large or small pressure deviation between adjacent IVC cages. During the performance verification before use, the pressure difference of adjacent IVC cages is often inconsistent, which causes the animal laboratory to be unable to normally put into use. At the same time, the IVC system at the present stage is matched with double fans, that is, one fan is independently used for air supply and exhaust, and the air exchange frequency and pressure difference of the IVC cage are realized by controlling the air supply of the two fans. The control function is complicated, and the cooperation between the double fans is complex, which brings great difficulty to the debugging and installation and performance verification. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application designs a positive pressure and negative pressure ventilation rotating IVC system and a control method thereof to solve the deficiencies in the prior art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a positive pressure and negative pressure ventilation rotating IVC system comprises:

[0006] An efficient fan box;

[0007] A main connecting pipeline connected with the efficient fan box;

[0008] A combined IVC cage mechanism connected with the main connecting pipeline on the other side of the efficient fan box;

[0009] A PLC control box connected with the efficient fan box and the combined IVC cage mechanism for controlling the operation of the whole system.

[0010] As a preferred scheme of the present application, the high-efficiency ventilator box comprises a ventilator and a No. 1 high-efficiency filter connected with the ventilator.

[0011] As a preferred scheme of the present application, the main connecting pipeline comprises:

[0012] A No. 3 cage box regulating air pipe in communication with the combined IVC cage box mechanism;

[0013] A hydrogen peroxide exhaust pipe in communication with the No. 3 cage box regulating air pipe relative to the other end of the combined IVC cage box mechanism;

[0014] A No. 1 rotating air pipe in communication with the combined IVC cage box mechanism;

[0015] A No. 2 fresh air inlet pipe in communication with the No. 1 rotating air pipe relative to the other end of the combined IVC cage box mechanism;

[0016] A positive pressure state air supply pipe in communication with the No. 1 rotating air pipe relative to the other end of the combined IVC cage box mechanism;

[0017] A No. 2 rotating air pipe in communication with the positive pressure state air supply pipe relative to the other end of the No. 2 fresh air inlet pipe;

[0018] The ventilator is in communication with the No. 2 rotating air pipe relative to the other end of the positive pressure state air supply pipe;

[0019] A No. 3 rotating air pipe in communication with the No. 1 high-efficiency filter;

[0020] A hydrogen peroxide connecting air pipe in communication with the No. 3 rotating air pipe relative to the other side of the No. 1 high-efficiency filter and in communication with the hydrogen peroxide exhaust pipe;

[0021] A positive pressure state exhaust pipe in communication with the hydrogen peroxide connecting air pipe relative to the other end of the No. 3 rotating air pipe;

[0022] A total exhaust pipe in communication with the positive pressure state exhaust pipe relative to the other side of the hydrogen peroxide connecting air pipe;

[0023] A negative pressure state exhaust pipe in communication with the positive pressure state air supply pipe and the No. 2 rotating air pipe at one end and in communication with the positive pressure state exhaust pipe and the total exhaust pipe at the other end;

[0024] A ventilator cross-over air pipe in connection with the No. 3 rotating air pipe at one end and with the ventilator at the other end;

[0025] A No. 1 fresh air inlet pipe in communication with the hydrogen peroxide connecting air pipe and the No. 3 rotating air pipe at one end;

[0026] A hydrogen peroxide aeration pipe in connection with the No. 1 fresh air inlet pipe.

[0027] As a preferred scheme of the present application, the combination IVC cage mechanism comprises:

[0028] The No. 1 IVC cage mechanism is connected with the No. 3 cage adjusting air pipe and the No. 1 rotating air pipe.

[0029] The No. 2 IVC cage mechanism is connected with the No. 3 cage adjusting air pipe and the No. 1 rotating air pipe.

[0030] As a preferred scheme of the present application, the No. 1 IVC cage mechanism comprises:

[0031] The No. 1 cage adjusting air pipe is communicated with the No. 3 cage adjusting air pipe.

[0032] The No. 4 adjusting type electric air valve is arranged on the No. 1 cage adjusting air pipe.

[0033] The No. 1 IVC cage is connected with the No. 1 cage adjusting air pipe opposite to the other end of the No. 3 cage adjusting air pipe.

[0034] The No. 1 cage air inlet pipe is arranged on the same side of the No. 1 cage adjusting air pipe, one end of which is connected with the No. 1 IVC cage and the other end of which is connected with the No. 1 rotating air pipe.

[0035] The No. 4 pressure-independent type mechanical constant air volume valve and the No. 4 on-off type electric air valve are arranged on the No. 1 cage air inlet pipe between the No. 1 IVC cage and the No. 1 rotating air pipe in sequence.

[0036] The No. 2 cage adjusting air pipe is connected with the No. 1 IVC cage opposite to the other side of the No. 1 cage adjusting air pipe.

[0037] The No. 3 adjusting type electric air valve is arranged on the No. 2 cage adjusting air pipe.

[0038] The No. 4 cage adjusting air pipe is connected with the No. 2 cage adjusting air pipe opposite to the other side of the No. 1 IVC cage.

[0039] The No. 2 cage air inlet pipe is connected with the No. 1 IVC cage at one end and the No. 1 rotating air pipe at the other end.

[0040] The No. 3 pressure-independent type mechanical constant air volume valve and the No. 3 on-off type electric air valve are arranged on the No. 2 cage air inlet pipe between the No. 1 IVC cage and the No. 1 rotating air pipe in sequence.

[0041] As a preferred scheme of the present application, the No. 2 IVC cage mechanism comprises:

[0042] The No. 2 IVC cage is connected with the No. 3 cage adjusting air pipe.

[0043] 1st regulating type electric air valve, arranged on the 3rd cage adjusting air pipe near one end of the 2nd IVC cage;

[0044] 3rd cage air inlet pipe, arranged on the same side of the 1st regulating type electric air valve, one end connected with the 2nd IVC cage and the other end communicated with the 1st rotating air pipe;

[0045] The 1st pressure-independent type mechanical constant air volume valve and the 1st on-off type electric air valve are arranged on the 3rd cage air inlet pipe between the 2nd IVC cage and the 1st rotating air pipe in sequence;

[0046] The 4th cage adjusting air pipe is connected with the 2nd IVC cage;

[0047] 4th cage air inlet pipe, arranged on the same side of the 4th cage adjusting air pipe, one end connected with the 2nd IVC cage and the other end communicated with the 1st rotating air pipe;

[0048] The 2nd pressure-independent type mechanical constant air volume valve and the 2nd on-off type electric air valve are arranged on the 4th cage air inlet pipe between the 2nd IVC cage and the 1st rotating air pipe in sequence.

[0049] As a preferred scheme of the present application, the 1st IVC cage is provided with a 1st temperature and humidity sensor, a 1st pressure difference sensor and a 1st ammonia concentration sensor.

[0050] As a preferred scheme of the present application, the 2nd IVC cage is provided with a 2nd temperature and humidity sensor, a 2nd pressure difference sensor and a 2nd ammonia concentration sensor.

[0051] As a preferred scheme of the present application, the 1st fresh air inlet pipe is provided with a 7th on-off type electric air valve;

[0052] The hydrogen peroxide filling pipe is provided with a 1st manual air valve;

[0053] The positive pressure state exhaust pipe is provided with a 5th on-off type electric air valve;

[0054] The hydrogen peroxide connecting air pipe is provided with a 6th on-off type electric air valve;

[0055] The 3rd rotating air pipe is provided with a 12th on-off type electric air valve;

[0056] The fan cross air pipe is provided with an 11th on-off type electric air valve;

[0057] The 2nd rotating air pipe is provided with an air volume sensor;

[0058] The negative pressure state exhaust pipe is provided with a 10th on-off type electric air valve;

[0059] The positive pressure state air supply pipe is provided with a No. 9 on-off type electric air valve;

[0060] The No. 2 fresh air inlet pipe is provided with a No. 8 on-off type electric air valve and a No. 2 high-efficiency filter;

[0061] The hydrogen peroxide exhaust pipe is provided with a No. 2 manual air valve.

[0062] A control method of an IVC system supporting positive pressure and negative pressure ventilation, comprising:

[0063] 1) When the IVC system is in a positive pressure working mode, the application is in the following state under the control of a PLC control box:

[0064] The ventilator is in an open state and runs at a fixed frequency and constant air volume;

[0065] Meanwhile, the No. 7 on-off type electric air valve, the No. 12 on-off type electric air valve, the No. 9 on-off type electric air valve, the No. 1 on-off type electric air valve, the No. 4 on-off type electric air valve and the No. 5 on-off type electric air valve are in an open state;

[0066] Meanwhile, the No. 11 on-off type electric air valve, the No. 10 on-off type electric air valve, the No. 2 on-off type electric air valve, the No. 3 on-off type electric air valve, the No. 6 on-off type electric air valve and the No. 8 on-off type electric air valve are in a closed state;

[0067] Meanwhile, the No. 1 regulating type electric air valve and the No. 4 regulating type electric air valve are in a closed state;

[0068] Meanwhile, the No. 1 manual air valve and the No. 2 manual air valve are in a closed state;

[0069] Meanwhile, the No. 2 regulating type electric air valve is in an open state and can be automatically adjusted according to the value of the No. 2 pressure difference sensor;

[0070] Meanwhile, the No. 3 regulating type electric air valve is in an open state and can be automatically adjusted according to the value of the No. 1 pressure difference sensor (202);

[0071] Meanwhile, the No. 1 pressure-independent type mechanical constant air volume air valve, the No. 2 pressure-independent type mechanical constant air volume air valve, the No. 3 pressure-independent type mechanical constant air volume air valve and the No. 4 pressure-independent type mechanical constant air volume air valve are all constant air volume air valves, and the opening degree is the air volume opening degree corresponding to the demand air exchange frequency of the IVC cage, which is constant regardless of the state of the IVC system;

[0072] 2) When the IVC system is in a negative pressure working mode, the application is in the following state under the control of a PLC control box:

[0073] The ventilator is in an open state and runs at a fixed frequency and constant air volume;

[0074] Meanwhile, the 8th switch type electric air valve, the 2nd switch type electric air valve, the 3rd switch type electric air valve, the 6th switch type electric air valve, the 11th switch type electric air valve and the 10th switch type electric air valve (610) are in the open state

[0075] Meanwhile, the 1st switch type electric air valve, the 4th switch type electric air valve, the 9th switch type electric air valve, the 12th switch type electric air valve, the 5th switch type electric air valve and the 7th switch type electric air valve are in the closed state.

[0076] Meanwhile, the 2nd regulating type electric air valve and the 3rd regulating type electric air valve are in the closed state.

[0077] Meanwhile, the 1st manual air valve and the 2nd manual air valve are in the closed state.

[0078] Meanwhile, the 1st regulating type electric air valve is in the open state and can be automatically adjusted according to the value of the 2nd differential pressure sensor.

[0079] Meanwhile, the 4th regulating type electric air valve is in the open state and can be automatically adjusted according to the value of the 1st differential pressure sensor.

[0080] Meanwhile, the 1st pressure independent type mechanical constant air volume air valve, the 2nd pressure independent type mechanical constant air volume air valve, the 3rd pressure independent type mechanical constant air volume air valve and the 4th pressure independent type mechanical constant air volume air valve are constant air volume air valves, and the opening degree is the air volume opening degree corresponding to the demand ventilation frequency of the IVC cage, and the opening degree is constant.

[0081] 3) When the IVC system disinfection working mode, the application is in the following state under the control of the PLC control box:

[0082] The ventilator is in the open state and fixed operating frequency constant air volume operation.

[0083] Meanwhile, the 12th switch type electric air valve, the 9th switch type electric air valve, the 1st switch type electric air valve, the 2nd switch type electric air valve, the 3rd switch type electric air valve, the 4th switch type electric air valve and the 6th switch type electric air valve are in the open state.

[0084] Meanwhile, the 7th switch type electric air valve, the 11th switch type electric air valve, the 8th switch type electric air valve, the 10th switch type electric air valve and the 5th switch type electric air valve are in the closed state.

[0085] Meanwhile, the 2nd regulating type electric air valve and the 3rd regulating type electric air valve are in the open and full opening state.

[0086] Meanwhile, the 1st regulating type electric air valve and the 4th regulating type electric air valve are in the closed state.

[0087] At the same time, the first manual air valve and the second manual air valve are in a closed state.

[0088] Compared with the prior art, the present application has the following advantages:

[0089] In the present application, the expected effect of the IVC system can be achieved by a single fan, the control system is simplified, the manufacturing cost is reduced, and the difficulty of debugging, installation and performance verification is greatly reduced; all IVC cage pressure differences can be independently controlled, and when there is a pressure deviation between adjacent IVC cages, independent pressure difference correction can be performed; the IVC cage can be automatically switched to a positive pressure state or a negative pressure state according to the experimental type of laboratory staff, without the need to set two sets of different pressure interval IVC systems, thereby greatly reducing the laboratory construction cost; for example, the attack of large and small mice needs to be bred in a negative pressure IVC cage to prevent toxic substances from spreading through the air to the breeding room, causing batch experimental animals to be infected; non-attack large and small mice need to be bred in a positive pressure IVC cage to prevent external air from seeping into the IVC cage and avoid contamination of experimental animals. BRIEF DESCRIPTION OF DRAWINGS

[0090] Figure 1 It is a whole schematic diagram of the present application;

[0091] Figure 2 It is an IVC positive pressure state airflow passage diagram;

[0092] Figure 3 It is an IVC negative pressure state airflow passage diagram;

[0093] Figure 4 It is an IVC disinfection state airflow passage diagram.

[0094] In the figure: 1, high-efficiency fan box; 101, fan; 102, No. 1 high-efficiency filter; 2, No. 1 IVC cage box; 201, No. 1 temperature and humidity sensor; 202, No. 1 differential pressure sensor; 203, No. 1 ammonia concentration sensor; 3, No. 2 IVC cage box; 301, No. 2 temperature and humidity sensor; 302, No. 2 differential pressure sensor; 303, No. 2 ammonia concentration sensor; 401, No. 1 pressure-independent mechanical constant air volume damper; 402, No. 2 pressure-independent mechanical constant air volume damper; 403, No. 3 pressure-independent mechanical constant air volume damper; 404, No. 4 pressure-independent mechanical constant air volume damper; 501, No. 1 regulating type electric damper; 502, No. 2 regulating type electric damper; 503, No. 3 regulating type electric damper; 504, No. 4 regulating type electric damper; 601, No. 1 on-off type electric damper; 601, No. 2 on-off type electric damper; 602, No. 3 on-off type electric damper; 603, No. 4 on-off type electric damper; 604, No. 5 on-off type electric damper; 605, No. 6 on-off type electric damper; 606, No. 7 on-off type electric damper; 607, No. 8 on-off type electric damper; 608, No. 9 on-off type electric damper; 609, No. 10 on-off type electric damper; 610, No. 11 on-off type electric damper; 611, No. 12 on-off type electric damper; 7, No. 1 manual damper; 8, hydrogen peroxide aeration pipe; 901, No. 1 fresh air inlet pipe; 902, No. 2 fresh air inlet pipe; 10, negative pressure state exhaust pipe; 11, No. 1 rotating air pipe; 12, positive pressure state supply air pipe; 13, No. 2 rotating air pipe; 14, total exhaust pipe; 15, No. 1 cage box regulating air pipe; 16, No. 1 cage box inlet air pipe; 17, No. 3 cage box regulating air pipe; 18, No. 3 cage box inlet air pipe; 19, No. 2 cage box regulating air pipe; 20, No. 2 cage box inlet air pipe; 21, No. 4 cage box regulating air pipe; 22, No. 4 cage box inlet air pipe; 23, positive pressure state exhaust pipe; 24, hydrogen peroxide communication air pipe; 25, air volume sensor; 26, fan cross-over air pipe; 27, No. 3 rotating air pipe; 28, No. 2 high-efficiency filter; 29, No. 2 manual damper; 30, hydrogen peroxide exhaust pipe; 31, PLC control box. DETAILED DESCRIPTION

[0095] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0096] Embodiment 1:

[0097] Please refer to Figure 1 The present application provides a technical solution:

[0098] The positive and negative pressure ventilation rotating IVC system comprises a high-efficiency ventilator box 1, a main connecting pipeline, a combined IVC cage box mechanism and a PLC control box 31, wherein the main connecting pipeline is connected with the high-efficiency ventilator box 1; the combined IVC cage box mechanism is connected with the main connecting pipeline on the other side of the high-efficiency ventilator box 1; and the PLC control box 31 is connected with the high-efficiency ventilator box 1 and the combined IVC cage box mechanism and used for controlling the operation of the whole system.

[0099] The high-efficiency ventilator box 1 comprises a ventilator 101 and a No. 1 high-efficiency filter 102 connected with the ventilator.

[0100] Further, the main connecting pipeline comprises a No. 3 cage box adjusting air pipe 17, a hydrogen peroxide exhaust pipe 30, a No. 1 rotating air pipe 11, a No. 2 fresh air inlet pipe 902, a positive pressure state air supply pipe 12, a No. 2 rotating air pipe 13, a No. 3 rotating air pipe 27, a hydrogen peroxide connecting air pipe 24, a positive pressure state exhaust pipe 23, a total exhaust pipe 14, a negative pressure state exhaust pipe 10, a fan cross-connection air pipe 26, a No. 1 fresh air inlet pipe 901 and a hydrogen peroxide aeration pipe 8, wherein the No. 3 cage box adjusting air pipe 17 is communicated with the combined IVC cage box mechanism; the hydrogen peroxide exhaust pipe 30 is communicated with the No. 3 cage box adjusting air pipe 17 on the other end of the combined IVC cage box mechanism; the No. 1 rotating air pipe 11 is communicated with the combined IVC cage box mechanism; the No. 2 fresh air inlet pipe 902 is communicated with the No. 1 rotating air pipe 11 on the other end of the combined IVC cage box mechanism; the positive pressure state air supply pipe 12 is communicated with the No. 1 rotating air pipe 11 on the other end of the combined IVC cage box mechanism; the No. 2 rotating air pipe 13 is communicated with the positive pressure state air supply pipe 12 on the other end of the No. 2 fresh air inlet pipe 902; the ventilator 101 is communicated with the No. 2 rotating air pipe 13 on the other end of the positive pressure state air supply pipe 12; the No. 3 rotating air pipe 27 is communicated with the No. 1 high-efficiency filter 102; the hydrogen peroxide connecting air pipe 24 is communicated with the No. 3 rotating air pipe 27 on the other side of the No. 1 high-efficiency filter 102 and the hydrogen peroxide exhaust pipe 30; the positive pressure state exhaust pipe 23 is communicated with the hydrogen peroxide connecting air pipe 24 on the other end of the No. 3 rotating air pipe 27; the total exhaust pipe 14 is communicated with the positive pressure state exhaust pipe 23 on the other side of the hydrogen peroxide connecting air pipe 24; the negative pressure state exhaust pipe 10 is communicated with the positive pressure state air supply pipe 12 and the No. 2 rotating air pipe 13 on one end and communicated with the positive pressure state exhaust pipe 23 and the total exhaust pipe 14 on the other end; the fan cross-connection air pipe 26 is connected with the No. 3 rotating air pipe 27 on one end and connected with the ventilator 101 on the other end; the No. 1 fresh air inlet pipe 901 is communicated with the hydrogen peroxide connecting air pipe 24 and the No. 3 rotating air pipe 27 on one end; and the hydrogen peroxide aeration pipe 8 is connected with the No. 1 fresh air inlet pipe 901.

[0101] Further, the combined IVC cage mechanism comprises: a No. 1 IVC cage mechanism and a No. 2 IVC cage mechanism, wherein: the No. 1 IVC cage mechanism is connected with the No. 3 cage adjusting air pipe 17 and the No. 1 rotating air pipe 11; the No. 2 IVC cage mechanism is connected with the No. 3 cage adjusting air pipe 17 and the No. 1 rotating air pipe 11.

[0102] Specifically, the No. 1 IVC cage mechanism comprises: a No. 1 cage adjusting air pipe 15, a No. 4 regulating type electric air valve 504, a No. 1 IVC cage 2, a No. 1 cage air inlet pipe 16, a No. 2 cage adjusting air pipe 19, a No. 3 regulating type electric air valve 503, a No. 4 cage adjusting air pipe 21, and a No. 2 cage air inlet pipe 20, wherein: the No. 1 cage adjusting air pipe 15 is in communication with the No. 3 cage adjusting air pipe 17; the No. 4 regulating type electric air valve 504 is arranged on the No. 1 cage adjusting air pipe 15; the No. 1 IVC cage 2 is connected with the No. 1 cage adjusting air pipe 15 at the other end of the No. 3 cage adjusting air pipe 17; the No. 1 cage air inlet pipe 16 is arranged on the same side of the No. 1 cage adjusting air pipe 15, one end of which is connected with the No. 1 IVC cage 2, and the other end of which is connected with the No. 1 rotating air pipe 11; the No. 1 cage air inlet pipe 16 between the No. 1 IVC cage 2 and the No. 1 rotating air pipe 11 is sequentially provided with a No. 4 pressure-independent type mechanical constant air volume valve 404 and a No. 4 on-off type electric air valve 604; the No. 2 cage adjusting air pipe 19 is connected with the No. 1 IVC cage 2 at the other side of the No. 1 cage adjusting air pipe 15; the No. 3 regulating type electric air valve 503 is arranged on the No. 2 cage adjusting air pipe 19; the No. 4 cage adjusting air pipe 21 is connected with the No. 2 cage adjusting air pipe 19 at the other side of the No. 1 IVC cage 2; one end of the No. 2 cage air inlet pipe 20 is connected with the No. 1 IVC cage 2, and the other end of which is connected with the No. 1 rotating air pipe 11; the No. 2 cage air inlet pipe 20 between the No. 1 IVC cage 2 and the No. 1 rotating air pipe 11 is sequentially provided with a No. 3 pressure-independent type mechanical constant air volume valve 403 and a No. 3 on-off type electric air valve 603.

[0103] Specifically, the IVC cage mechanism No. 2 includes: IVC cage No. 2 3, adjustable electric air valve No. 1 501, air inlet pipe No. 3 18, and air inlet pipe No. 4 22. Specifically: IVC cage No. 2 3 is connected to adjustable air valve No. 3 17; adjustable electric air valve No. 1 501 is located on adjustable air valve No. 3 17 near one end of IVC cage No. 2 3; air inlet pipe No. 3 18 is located on the same side as adjustable electric air valve No. 1 501, with one end connected to IVC cage No. 2 3 and the other end connected to rotating air valve No. 11; IVC cage No. 2 3 and rotating air valve No. 11... On the No. 3 cage box air inlet pipe 18 between pipes 11, there are sequentially installed No. 1 pressure-independent mechanical constant air volume valve 401 and No. 1 switch-type electric air valve 601; the No. 4 cage box regulating air pipe 21 is connected to the No. 2 IVC cage box 3; the No. 4 cage box air inlet pipe 22 is located on the same side as the No. 4 cage box regulating air pipe 21, one end is connected to the No. 2 IVC cage box 3, and the other end is connected to the No. 1 rotating air pipe 11; on the No. 4 cage box air inlet pipe 22 between the No. 2 IVC cage box 3 and the No. 1 rotating air pipe 11, there are sequentially installed No. 2 pressure-independent mechanical constant air volume valve 402 and No. 2 switch-type electric air valve 602.

[0104] Furthermore, the No. 1 IVC cage 2 is equipped with a No. 1 temperature and humidity sensor 201, a No. 1 differential pressure sensor 202, and a No. 1 ammonia concentration sensor 203.

[0105] Secondly, the No. 2 IVC cage 3 is equipped with a No. 2 temperature and humidity sensor 301, a No. 2 differential pressure sensor 302, and a No. 2 ammonia concentration sensor 303.

[0106] Finally, the following are installed: No. 7 switch-type electric air valve 607 on the No. 1 fresh air inlet duct 901; No. 1 manual air valve 7 on the hydrogen peroxide charging duct 8; No. 5 switch-type electric air valve 605 on the positive pressure exhaust duct 23; No. 6 switch-type electric air valve 606 on the hydrogen peroxide connecting duct 24; No. 12 switch-type electric air valve 612 on the No. 3 rotating duct 27; No. 11 switch-type electric air valve 611 on the fan bridging duct 26; No. 2 rotating duct 13 with an air volume sensor 25; No. 10 switch-type electric air valve 610 on the negative pressure exhaust duct 10; No. 9 switch-type electric air valve 609 on the positive pressure supply duct 12; No. 8 switch-type electric air valve 608 and No. 2 high-efficiency filter 28 on the No. 2 fresh air inlet duct 902; and No. 2 manual air valve 29 on the hydrogen peroxide exhaust duct 30.

[0107] Example 2:

[0108] A control method for a positive and negative pressure ventilation rotating IVC system.

[0109] 1. For example Figure 1As shown, the general description is as follows: This invention can automatically switch between positive and negative pressure working states of the IVC system through the PLC control box 31 according to the experimental situation of laboratory staff, and also has the function of compatibility with disinfection conditions.

[0110] 2. For example Figure 2 As shown, the solid-lined ducts with arrows indicate open channels, while the remaining dashed-lined ducts are closed. In the positive pressure operating mode of the IVC system: When this invention is in positive pressure operating mode, all IVC cages will be in a positive pressure environment, effectively preventing outside air infiltration and avoiding contamination of the experimental animals. In the positive pressure operating mode of the IVC system, this invention will be in the following states under the control of the PLC control box 31:

[0111] Ventilation fan 101 is in the on state and operates at a fixed frequency with a constant air volume.

[0112] Meanwhile, the No. 7 switch type electric air valve 607, the No. 12 switch type electric air valve 612, the No. 9 switch type electric air valve 609, the No. 1 switch type electric air valve 601, the No. 4 switch type electric air valve 604, and the No. 5 switch type electric air valve 605 are in the open state.

[0113] Meanwhile, the No. 11 switch-type electric air valve 611, the No. 10 switch-type electric air valve 610, the No. 2 switch-type electric air valve 602, the No. 3 switch-type electric air valve 603, the No. 6 switch-type electric air valve 606, and the No. 8 switch-type electric air valve 608 are in the closed state.

[0114] Meanwhile, No. 1 regulating electric air valve 501 and No. 4 regulating electric air valve 504 are in the closed state.

[0115] Meanwhile, manual air valve 7 (No. 1) and manual air valve 29 (No. 2) are in the closed state.

[0116] Meanwhile, the No. 2 adjustable electric air valve 502 is in the open state and its opening degree can be automatically adjusted according to the value of the No. 2 differential pressure sensor 302. The differential pressure inside all IVC cages in this invention is set to +10Pa. When the PLC control box 31 detects that the value of the No. 2 differential pressure sensor 302 is > +11.5Pa, it will slowly increase the opening degree of the No. 2 adjustable electric air valve 502 until the PLC control box 31 detects that the value of the No. 2 differential pressure sensor 302 is ≤10Pa, at which point the opening degree of the No. 2 adjustable electric air valve 502 will remain unchanged. When the PLC control box 31 detects that the value of the No. 2 differential pressure sensor 302 is < +8.5Pa, it will slowly decrease the opening degree of the No. 2 adjustable electric air valve 502 until the PLC control box 31 detects that the value of the No. 2 differential pressure sensor 302 is ≥10Pa, at which point the opening degree of the No. 2 adjustable electric air valve 502 will remain unchanged. When the PLC control box 31 detects that the value of differential pressure sensor 302 is between +8.5Pa and +11.5Pa, the No. 2 regulating electric air valve 502 does not operate.

[0117] Meanwhile, the No. 3 adjustable electric air valve 503 is in the open state and its opening degree can be automatically adjusted according to the value of the No. 1 differential pressure sensor 202. The differential pressure inside all IVC cages in this invention is set to +10 Pa. When the PLC control box 31 detects that the value of the No. 1 differential pressure sensor 202 is > +11.5 Pa, it will slowly increase the opening degree of the No. 3 adjustable electric air valve 503 until the PLC control box 31 detects that the value of the No. 1 differential pressure sensor 202 is ≤ 10 Pa, at which point the opening degree of the No. 3 adjustable electric air valve 503 will remain unchanged. When the PLC control box 31 detects that the value of the No. 1 differential pressure sensor 202 is < +8.5 Pa, it will slowly decrease the opening degree of the No. 3 adjustable electric air valve 503 until the PLC control box 31 detects that the value of the No. 1 differential pressure sensor 202 is ≥ 10 Pa, at which point the opening degree of the No. 3 adjustable electric air valve 503 will remain unchanged. When the PLC control box 31 detects that the value of differential pressure sensor 202 is between +8.5Pa and +11.5Pa, the No. 3 regulating electric air valve 503 does not operate.

[0118] Note: When IVC cage 2 (No. 1) is under positive pressure, the air volume supplied by the air inlet pipe 16 of cage 1 is greater than the air volume discharged by the regulating air pipe 19 of cage 2. The difference in air volume is the leakage air volume, which is discharged from the animal breathing hole of IVC cage 2 (No. 1), which is equipped with a high-efficiency filter. The same applies to IVC cage 3 (No. 2).

[0119] Meanwhile, pressure-independent mechanical constant air volume valves 401 (No. 1), 402 (No. 2), 403 (No. 3), and 404 (No. 4) are all constant air volume valves. Regardless of the state of the IVC system, their opening degree is always the air volume opening degree corresponding to the required number of air changes for the IVC cage, and the opening degree remains unchanged.

[0120] 3. For example Figure 3 As shown, the solid-lined ducts with arrows indicate open channels, while the remaining dashed-lined ducts are closed. In the IVC system negative pressure operating mode: When this invention is in negative pressure operating mode, all IVC cages will be in a negative pressure environment, effectively preventing the spread of pathogenic microorganisms or other toxic components from the challenged experimental animals to the breeding room via the air, thus preventing mass infection of the experimental animals. In the IVC system negative pressure operating mode, this invention will be in the following state under the control of the PLC control box 31:

[0121] Ventilation fan 101 is in the on state and operates at a fixed frequency with a constant air volume.

[0122] Meanwhile, the 8th switch type electric air valve 608, the 2nd switch type electric air valve 602, the 3rd switch type electric air valve 603, the 6th switch type electric air valve 606, the 11th switch type electric air valve 611 and the 10th switch type electric air valve 610 are in the open state.

[0123] Meanwhile, the 1st switch type electric air valve 601, the 4th switch type electric air valve 604, the 9th switch type electric air valve 609, the 12th switch type electric air valve 612, the 5th switch type electric air valve 605 and the 7th switch type electric air valve 607 are in the closed state.

[0124] Meanwhile, the 2nd regulating type electric air valve 502 and the 3rd regulating type electric air valve 503 are in the closed state.

[0125] Meanwhile, the 1st manual air valve 7 and the 2nd manual air valve 29 are in the closed state.

[0126] Meanwhile, the 1st regulating type electric air valve 501 is in the open state and can be automatically adjusted according to the value of the 2nd differential pressure sensor 302; the set pressure difference in all IVC cages of the application is -10 Pa, when the PLC control box 31 detects that the value of the 2nd differential pressure sensor 302 is greater than -8.5 Pa, the opening of the 1st regulating type electric air valve 501 will be slowly increased until the PLC control box 31 detects that the value of the 2nd differential pressure sensor 302 is less than or equal to -10 Pa, the opening of the 1st regulating type electric air valve 501 will be maintained unchanged; when the PLC control box 31 detects that the value of the 2nd differential pressure sensor 302 is less than -11.5 Pa, the opening of the 1st regulating type electric air valve 501 will be slowly reduced until the PLC control box 31 detects that the value of the 2nd differential pressure sensor 302 is greater than or equal to -10 Pa, the opening of the 1st regulating type electric air valve 501 will be maintained unchanged; when the PLC control box 31 detects that the value of the 2nd differential pressure sensor 302 is between -11.5 Pa and -8.5 Pa, the 1st regulating type electric air valve 501 will not act.

[0127] Meanwhile, the 4th regulating type electric air valve 504 is in an open state and can be automatically regulated according to the value of the 1st pressure difference sensor 202; the pressure difference in all IVC cages of the application is set to be-10 Pa, when the PLC control box 31 detects that the value of the 1st pressure difference sensor 202 is greater than-8.5 Pa, the opening of the 4th regulating type electric air valve 504 will be slowly increased until the PLC control box 31 detects that the value of the 1st pressure difference sensor 202 is less than or equal to-10 Pa, the opening of the 4th regulating type electric air valve 504 will be maintained. When the PLC control box 31 detects that the value of the 1st pressure difference sensor 202 is less than-11.5 Pa, the opening of the 4th regulating type electric air valve 504 will be slowly decreased until the PLC control box 31 detects that the value of the 1st pressure difference sensor 202 is greater than or equal to-10 Pa, the opening of the 4th regulating type electric air valve 504 will be maintained. When the PLC control box 31 detects that the value of the 1st pressure difference sensor 202 is between-11.5 Pa and-8.5 Pa, the 4th regulating type electric air valve 504 will not act.

[0128] Note: when the 1st IVC cage 2 is in a negative pressure state, the air volume of the 2nd cage air inlet pipe 20 is less than the air volume of the 1st cage regulating air pipe 15, the difference between the two air volumes is the infiltration air volume, which is infiltrated through the animal breathing hole of the 1st IVC cage 2, and the animal breathing hole is provided with a high-efficiency filter core. The 2nd IVC cage 3 is the same.

[0129] Meanwhile, the 1st, 2nd, 3rd and 4th pressure-independent mechanical constant air volume valves 401, 402, 403 and 404 are constant air volume valves, and the opening is the air volume opening corresponding to the required air exchange frequency of the IVC cage, and the opening is constant regardless of the state of the IVC system.

[0130] As shown in Figure 4 solid wind pipes with arrows are passages, and the remaining dashed wind pipes are shut off, and the IVC system disinfection mode: the IVC system should be disinfected according to the results of regular bacterial culture or according to the verified SOP time specification for regular or irregular disinfection to ensure that the planktonic bacteria and sediment bacteria in the IVC system are always within a controllable range, and prevent batch infection of experimental animals. When the IVC system disinfection mode, the application will be in the following state under the control of the PLC control box 31:

[0131] The ventilator 101 is in an open state and runs at a fixed frequency and constant air volume.

[0132] At the same time, the 12th switch type electric air valve 612, the 9th switch type electric air valve 609, the 1st switch type electric air valve 601, the 2nd switch type electric air valve 602, the 3rd switch type electric air valve 603, the 4th switch type electric air valve 604 and the 6th switch type electric air valve 606 are in the open state.

[0133] At the same time, the 7th switch type electric air valve 607, the 11th switch type electric air valve 611, the 8th switch type electric air valve 608, the 10th switch type electric air valve 610 and the 5th switch type electric air valve 605 are in the closed state.

[0134] At the same time, the 2nd regulating type electric air valve 502 and the 3rd regulating type electric air valve 503 are in the open and full opening state.

[0135] At the same time, the 1st regulating type electric air valve 501 and the 4th regulating type electric air valve 504 are in the closed state.

[0136] At the same time, the 1st manual air valve 7 and the 2nd manual air valve 29 are in the closed state.

[0137] When the IVC system is in the disinfection mode, the IVC system is in the sealed space circulation operation. At this time, the laboratory staff manually opens the 1st manual air valve 7, and introduces the atomized hydrogen peroxide into the IVC system through the hydrogen peroxide gas filling pipe 8. According to the "Medical Institutions Disinfection Technical Specification" WS / T367-2012, the hydrogen peroxide concentration should meet the 20mL / m3-30mL / m3 dosage and the action time is 60min. When the IVC system disinfection time meets 60min, the laboratory staff manually opens the 2nd manual air valve 29, and the hydrogen peroxide in the system is discharged through the hydrogen peroxide exhaust pipe 30.

[0138] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A positive and negative pressure ventilation wheel IVC system, comprising: include: High-efficiency ventilation fan box (1); The main connecting pipe is connected to the high-efficiency ventilation fan box (1); The combined IVC cage mechanism is connected to the main connecting pipe on the other side of the high-efficiency ventilation fan box (1); The PLC control box (31) is connected to the high-efficiency ventilation fan box (1) and the combined IVC cage mechanism, and is used to control the operation of the entire system. The high-efficiency ventilation box (1) includes: a ventilation fan (101) and a No. 1 high-efficiency filter (102) connected to the ventilation fan; The main connecting pipe includes: The No. 3 cage box regulating air duct (17) is connected to the combined IVC cage box mechanism; Hydrogen peroxide exhaust pipe (30) is connected to the No. 3 cage regulating duct (17) at the other end of the combined IVC cage mechanism; The No. 1 rotating air duct (11) is connected to the combined IVC cage mechanism; The No. 2 fresh air inlet duct (902) is connected to the No. 1 wheeled air duct (11) at the other end of the combined IVC cage mechanism; The positive pressure air supply duct (12) is connected to the No. 1 wheeled air duct (11) at the other end of the combined IVC cage mechanism; The No. 2 rotating air duct (13) is connected to the positive pressure air supply duct (12) at the other end relative to the No. 2 fresh air inlet duct (902); The ventilator (101) is connected to the No. 2 rotating air duct (13) at the other end of the positive pressure air supply duct (12); The No. 3 rotating air duct (27) is connected to the No. 1 high-efficiency filter (102); The hydrogen peroxide connecting duct (24) is connected to the No. 3 rotating duct (27) on the other side of the No. 1 high-efficiency filter (102) and is connected to the hydrogen peroxide exhaust duct (30); The positive pressure exhaust duct (23) is connected to the hydrogen peroxide connecting duct (24) at the other end relative to the No. 3 rotating duct (27); The main exhaust duct (14) is connected to the positive pressure exhaust duct (23) on the other side relative to the hydrogen peroxide connecting duct (24); 1 The negative pressure exhaust duct (10) is connected at one end to the positive pressure air supply duct (12) and the No. 2 rotating air duct (13), and at the other end to the positive pressure exhaust duct (23) and the main exhaust duct (14); The fan is connected to the air duct (26), one end of which is connected to the No. 3 rotating air duct (27), and the other end is connected to the ventilator (101); One end of the No. 1 fresh air inlet duct (901) is connected to the hydrogen peroxide connecting duct (24) and the No. 3 rotating duct (27); The hydrogen peroxide filling pipe (8) is connected to the No. 1 fresh air intake pipe (901); The combined IVC cage mechanism includes: The No. 1 IVC cage mechanism is connected to the No. 3 cage regulating air duct (17) and the No. 1 wheel air duct (11); The No. 2 IVC cage box mechanism is connected to the No. 3 cage box regulating air duct (17) and to the No. 1 wheel air duct (11); The No. 1 IVC cage mechanism includes: The No. 1 cage regulating air duct (15) is connected to the No. 3 cage regulating air duct (17); 4th regulating type electric air valve (504) is established on the 1st cage box regulating air pipe (15); 1st IVC cage box (2) is connected with the 1st cage box regulating air pipe (15) on the other side of the 3rd cage box regulating air pipe (17); 1st cage box air inlet pipe (16) is established on the same side of the 1st cage box regulating air pipe (15), one end is connected with the 1st IVC cage box (2), and the other end is connected with the 1st rotating air pipe (11); The 1st cage box air inlet pipe (16) between the 1st IVC cage box (2) and the 1st rotating air pipe (11) is sequentially provided with a 4th pressure-independent type mechanical constant air volume valve (404) and a 4th on-off type electric air valve (604); 2nd cage box regulating air pipe (19) is connected with the 1st IVC cage box (2) on the other side of the 1st cage box regulating air pipe (15); 3rd regulating type electric air valve (503) is established on the 2nd cage box regulating air pipe (19); 4th cage box regulating air pipe (21) is connected with the 2nd cage box regulating air pipe (19) on the other side of the 1st IVC cage box (2); 2nd cage box air inlet pipe (20) is connected with the 1st IVC cage box (2) on one end and connected with the 1st rotating air pipe (11) on the other end; The 2nd cage box air inlet pipe (20) between the 1st IVC cage box (2) and the 1st rotating air pipe (11) is sequentially provided with a 3rd pressure-independent type mechanical constant air volume valve (403) and a 3rd on-off type electric air valve (603); The 2nd IVC cage box mechanism comprises: 2nd IVC cage box (3) is connected with the 3rd cage box regulating air pipe (17); 1st regulating type electric air valve (501) is established on the 3rd cage box regulating air pipe (17) close to one end of the 2nd IVC cage box (3); 3rd cage box air inlet pipe (18) is established on the same side of the 1st regulating type electric air valve (501), one end is connected with the 2nd IVC cage box (3), and the other end is connected with the 1st rotating air pipe (11); The 3rd cage box air inlet pipe (18) between the 2nd IVC cage box (3) and the 1st rotating air pipe (11) is sequentially provided with a 1st pressure-independent type mechanical constant air volume valve (401) and a 1st on-off type electric air valve (601); The 4th cage box regulating air pipe (21) is connected with the 2nd IVC cage box (3); 4th cage box air inlet pipe (22) is established on the same side of the 4th cage box regulating air pipe (21), one end is connected with the 2nd IVC cage box (3), and the other end is connected with the 1st rotating air pipe (11); The 4th cage box air inlet pipe (22) between the 2nd IVC cage box (3) and the 1st rotating air pipe (11) is sequentially provided with a 2nd pressure-independent type mechanical constant air volume valve (402) and a 2nd on-off type electric air valve (602).

2. A positive and negative pressure ventilation capable rotary IVC system according to claim 1, wherein, The 1st IVC cage box (2) is provided with a 1st temperature and humidity sensor (201), a 1st differential pressure sensor (202) and a 1st ammonia concentration sensor (203).

3. A positive and negative pressure ventilation capable rotary IVC system according to claim 2, wherein, The 2nd IVC cage box (3) is internally provided with a 2nd temperature and humidity sensor (301), a 2nd differential pressure sensor (302), and a 2nd ammonia concentration sensor (303).

4. A positive and negative pressure ventilation capable rotary IVC system according to claim 3, wherein, The 1st fresh air inlet pipe (901) is provided with a 7th switch type electric air valve (607); The hydrogen peroxide gas filling pipe (8) is provided with a 1st manual air valve (7); The positive pressure state exhaust pipe (23) is provided with a 5th switch type electric air valve (605); The hydrogen peroxide connecting air pipe (24) is provided with a 6th switch type electric air valve (606); The 3rd rotating air pipe (27) is provided with a 12th switch type electric air valve (612); The fan cross air pipe (26) is provided with an 11th switch type electric air valve (611); The 2nd rotating air pipe (13) is provided with an air volume sensor (25); The negative pressure state exhaust pipe (10) is provided with a 10th switch type electric air valve (610); The positive pressure state air supply pipe (12) is provided with a 9th switch type electric air valve (609); The 2nd fresh air inlet pipe (902) is provided with an 8th switch type electric air valve (608) and a 2nd high-efficiency filter (28); The hydrogen peroxide exhaust pipe (30) is provided with a 2nd manual air valve (29).

5. A method of controlling a positive and negative pressure ventilation wheel IVC system according to claim 4, wherein, It comprises: 1) When the IVC system is in a positive pressure working mode, the system is controlled by a PLC control box (31) and is in the following state: The ventilator (101) is in an open state and runs at a fixed frequency and constant air volume; At the same time, the air volume sensor (25) monitors the air volume of the ventilator (101) in real time, and when the air volume is lower than the total air volume corresponding to the minimum air exchange frequency required by all IVC cage boxes, an alarm information can be uploaded to the PLC control box (31) to remind the staff of the compliance risk; At the same time, the 7th switch type electric air valve (607), the 12th switch type electric air valve (612), the 9th switch type electric air valve (609), the 1st switch type electric air valve (601), the 4th switch type electric air valve (604), and the 5th switch type electric air valve (605) are in an open state; At the same time, the 11th switch type electric air valve (611), the 10th switch type electric air valve (610), the 2nd switch type electric air valve (602), the 3rd switch type electric air valve (603), the 6th switch type electric air valve (606), and the 8th switch type electric air valve (608) are in a closed state; At the same time, the 1st regulating type electric air valve (501) and the 4th regulating type electric air valve (504) are in a closed state; At the same time, the 1st manual air valve (7) and the 2nd manual air valve (29) are in a closed state; At the same time, the 2nd regulating type electric air valve (502) is in an open state and can automatically adjust the opening degree according to the value of the 2nd differential pressure sensor (302); At the same time, the 3rd regulating type electric air valve (503) is in an open state and can automatically adjust the opening degree according to the value of the 1st differential pressure sensor (202). Meanwhile, the first pressure-independent mechanical constant air volume damper (401), the second pressure-independent mechanical constant air volume damper (402), the third pressure-independent mechanical constant air volume damper (403) and the fourth pressure-independent mechanical constant air volume damper (404) are constant air volume dampers, and the opening degree is the air volume opening degree corresponding to the required air exchange frequency of the IVC cage, and the opening degree is constant regardless of the state of the IVC system; Meanwhile, the first temperature and humidity sensor (201) and the second temperature and humidity sensor (301) respectively monitor the temperature and humidity values in the first IVC cage (2) and the second IVC cage (3) in real time, and when the temperature and humidity values deviate from the set upper threshold or lower threshold, the alarm information can be uploaded to the PLC control box (31) to remind the staff of compliance risks; Meanwhile, the first ammonia concentration sensor (203) and the second ammonia concentration sensor (303) respectively monitor the ammonia concentration values in the first IVC cage (2) and the second IVC cage (3) in real time, and when the ammonia concentration values deviate from the set upper threshold, the alarm information can be uploaded to the PLC control box (31) to remind the staff of compliance risks; 2) When the IVC system is in negative pressure mode, the system will be in the following state under the control of the PLC control box (31): The ventilator (101) is in an open state and runs at a fixed frequency and constant air volume; Meanwhile, the air volume sensor (25) monitors the air volume of the ventilator (101) in real time, and when the air volume is lower than the total air volume corresponding to the minimum air exchange frequency required by all IVC cages, the alarm information can be uploaded to the PLC control box (31) to remind the staff of compliance risks; Meanwhile, the eighth on-off type electric air damper (608), the second on-off type electric air damper (602), the third on-off type electric air damper (603), the sixth on-off type electric air damper (606), the eleventh on-off type electric air damper (611) and the tenth on-off type electric air damper (610) are in an open state Meanwhile, the first on-off type electric air damper (601), the fourth on-off type electric air damper (604), the ninth on-off type electric air damper (609), the twelfth on-off type electric air damper (612), the fifth on-off type electric air damper (605) and the seventh on-off type electric air damper (607) are in a closed state; Meanwhile, the second regulating type electric air damper (502) and the third regulating type electric air damper (503) are in a closed state; Meanwhile, the first manual air damper (7) and the second manual air damper (29) are in a closed state; Meanwhile, the first regulating type electric air damper (501) is in an open state and can automatically adjust the opening degree according to the value of the second differential pressure sensor (302); Meanwhile, the fourth regulating type electric air damper (504) is in an open state and can automatically adjust the opening degree according to the value of the first differential pressure sensor (202); Meanwhile, the first pressure-independent mechanical constant air volume damper (401), the second pressure-independent mechanical constant air volume damper (402), the third pressure-independent mechanical constant air volume damper (403) and the fourth pressure-independent mechanical constant air volume damper (404) are constant air volume dampers, and the opening degree is the air volume opening degree corresponding to the required ventilation frequency of the IVC cage, and the opening degree is constant regardless of the state of the IVC system; Meanwhile, the first temperature and humidity sensor (201) and the second temperature and humidity sensor (301) respectively monitor the temperature and humidity values in the first IVC cage (2) and the second IVC cage (3) in real time, and when the temperature and humidity values deviate from the set upper threshold or lower threshold, the alarm information can be uploaded to the PLC control box (31) to remind the staff of compliance risks; Meanwhile, the first ammonia concentration sensor (203) and the second ammonia concentration sensor (303) respectively monitor the ammonia concentration values in the first IVC cage (2) and the second IVC cage (3) in real time, and when the ammonia concentration values deviate from the set upper threshold, the alarm information can be uploaded to the PLC control box (31) to remind the staff of compliance risks; 3) When the IVC system disinfection mode, the system under the control of PLC control box (31) will be in the following state: The ventilator (101) is in an open state and runs at a fixed frequency constant volume; Meanwhile, the air volume sensor (25) monitors the circulating air volume of the ventilator (101) in real time, but does not alarm the air volume value; Meanwhile, the 12th on-off type electric air damper (612), the 9th on-off type electric air damper (609), the 1st on-off type electric air damper (601), the 2nd on-off type electric air damper (602), the 3rd on-off type electric air damper (603), the 4th on-off type electric air damper (604) and the 6th on-off type electric air damper (606) are in an open state; Meanwhile, the 7th on-off type electric air damper (607), the 11th on-off type electric air damper (611), the 8th on-off type electric air damper (608), the 10th on-off type electric air damper (610) and the 5th on-off type electric air damper (605) are in a closed state; Meanwhile, the 2nd regulating type electric air damper (502) and the 3rd regulating type electric air damper (503) are in an open and full opening state; Meanwhile, the 1st regulating type electric air damper (501) and the 4th regulating type electric air damper (504) are in a closed state; Meanwhile, the 1st manual air damper (7) and the 2nd manual air damper (29) are in a closed state; Meanwhile, the 1st temperature and humidity sensor (201), the 2nd temperature and humidity sensor (301), the 1st ammonia concentration sensor (203) and the 2nd ammonia concentration sensor (303) do not alarm the temperature and humidity values and ammonia concentration values.

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