Laboratory pressure zone control system

Abstract

The utility model relates to a zone control system, in particular to a laboratory pressure zone control system, which comprises a control cabinet, a first fan, a second fan, a first differential pressure sensor and a second differential pressure sensor, a control circuit is arranged in the control cabinet, and the first fan and the second fan are electrically connected with the control circuit. The first pressure difference sensor and the second pressure difference sensor are electrically connected with the control circuit, pressure of different areas is collected through the first pressure difference sensor and the second pressure difference sensor, then the first control circuit controls the first draught fan and the second draught fan, and the pressure of the different areas is controlled in a partitioned mode.

Description

Technical Field

[0001] This utility model relates to a zoning control system, and more particularly to a laboratory pressure zoning control system. Background Technology

[0002] In biosafety laboratories, cleanrooms, animal facilities, and other locations with stringent environmental requirements, precise control of the air pressure gradient between different functional areas (such as the core experimental area, buffer room, changing room, and corridor) is crucial. This pressure gradient is the core barrier to prevent the spread of contaminants, maintain the cleanliness level, and ensure the safety of personnel and experimental materials. Traditionally, this relies on a single differential pressure sensor to monitor a key point (such as the pressure difference between the core area and the corridor) and to maintain the set value at that point by adjusting the total airflow of a single main supply or exhaust fan. Utility Model Content

[0003] The purpose of this invention is to provide a laboratory pressure zoning control system to solve the problems existing in the prior art.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A laboratory pressure zoning control system includes a control cabinet, a first fan, a second fan, a first differential pressure sensor, and a second differential pressure sensor. The control cabinet is equipped with a control circuit. The first fan and the second fan are electrically connected to the control circuit. The first differential pressure sensor and the second differential pressure sensor are also electrically connected to the control circuit.

[0006] By adopting the above technical solution, the pressure in different areas is collected by the first differential pressure sensor and the second differential pressure sensor, and then the first control circuit controls the first fan and the second fan to perform zoned control of the pressure in different areas.

[0007] In a further embodiment, the control circuit includes:

[0008] Main power supply;

[0009] The first main switch, one end of which is connected to one end of the main power supply;

[0010] A first air switch, one end of which is connected to the other end of the main switch;

[0011] A second air switch, one end of which is connected to the other end of the first air switch;

[0012] A first regulating circuit is connected to the other end of a first air switch;

[0013] A second regulating circuit is connected to the other end of the first air switch;

[0014] A control power supply, wherein the AC terminal of the control power supply is connected to the other end of the second air switch;

[0015] A control chip, which is connected to the DC terminal of the control power supply;

[0016] An indicator circuit, wherein the indicator circuit is connected to the DC terminal of the control power supply;

[0017] and a display screen, which is connected to the DC terminal of the control power supply.

[0018] In a further embodiment, the first adjustment circuit includes:

[0019] The second main switch, one end of which is connected to the other end of the first air switch;

[0020] A first start switch, one end of which is connected to the other end of a second main switch;

[0021] A first forward rotation switch, one end of which is connected to the other end of a first start switch;

[0022] A first motor, one end of which is connected to the other end of a first forward rotation switch;

[0023] A first reverse switch, one end of which is connected to the middle position between the first start switch and the first forward switch;

[0024] A first fuse, one end of which is connected to the other end of a first reversing switch, and the other end of which is connected to the other end of a first motor.

[0025] In a further embodiment, the second adjustment circuit includes:

[0026] A third main switch, one end of which is connected to the other end of a second air switch;

[0027] A second start switch, one end of which is connected to the other end of a third main switch;

[0028] A second forward rotation switch, one end of which is connected to the other end of a second start switch;

[0029] A second motor, one end of which is connected to the other end of a second forward rotation switch;

[0030] The second reverse switch is connected at one end to the middle position of the second start switch and the second forward switch;

[0031] The second fuse has one end connected to the other end of the second reversing switch and the other end connected to the other end of the second motor.

[0032] In a further embodiment, the control chip has 24 ports, including a first common terminal, a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a second common terminal, a first signal input terminal, a first signal output terminal, a second signal input terminal, a second signal output terminal, a first power supply terminal, a second power supply terminal, a ground terminal, a third common terminal, a first output terminal, a second output terminal, a third output terminal, a fourth common terminal, a fourth output terminal, a fifth output terminal, a third power supply terminal, and a fourth power supply terminal. The first common terminal is connected to the DC input terminal of the control power supply. The input terminal is connected to one end of the first differential pressure sensor, the other end of the first differential pressure sensor is connected to the first signal output terminal, the second signal input terminal is connected to one end of the second differential pressure sensor, the other end of the second differential pressure sensor is connected to the second signal output terminal, the first power supply terminal is connected to the live wire of the main power supply, the second power supply terminal is connected to the neutral wire of the main power supply, the grounding terminal is connected to the earth, the third power supply terminal is connected to the input terminal of the DC terminal of the control power supply, the fourth power supply terminal is connected to the output terminal of the DC terminal of the control power supply, the third common terminal is connected to the live wire of the main power supply, and the fourth common terminal is connected to the live wire of the main power supply.

[0033] A first switch, one end of which is connected to a first input terminal, and the other end of which is connected to a second common terminal;

[0034] A second switch, one end of which is connected to a second input terminal, and the other end of which is connected to a second common terminal;

[0035] A third switch, one end of which is connected to a third input terminal, and the other end of which is connected to a second common terminal;

[0036] The fourth switch has one end connected to the fourth input terminal and the other end connected to the second common terminal.

[0037] The fifth switch has one end connected to the fifth input terminal and the other end connected to the second common terminal.

[0038] The sixth switch, one end of which is connected to the sixth input terminal, and the other end of which is connected to the second common terminal;

[0039] The first intermediate relay has one end connected to the first output terminal and the other end connected to the neutral wire of the main power supply.

[0040] The second intermediate relay has one end connected to the second output terminal and the other end connected to the neutral wire of the main power supply.

[0041] The third intermediate relay, one end of which is connected to the third output terminal, and the other end of which is connected to the neutral wire of the main power supply;

[0042] The fourth intermediate relay, one end of which is connected to the fourth output terminal, and the other end of which is connected to the neutral line of the main power supply;

[0043] And a fifth intermediate relay, one end of which is connected to the fifth output terminal, and the other end of which is connected to the neutral line of the main power supply.

[0044] In a further embodiment, the indicating circuit includes:

[0045] The seventh switch, one end of which is connected to the output terminal of the DC power supply;

[0046] The first indicator light has one end connected to the other end of the seventh switch, and the other end of the first indicator light is connected to the input terminal of the DC power supply.

[0047] The eighth switch, one end of which is connected to the output terminal of the DC power supply;

[0048] The second indicator light has one end connected to the other end of the eighth switch, and the other end connected to the input terminal of the DC power supply.

[0049] The ninth switch, one end of which is connected to the output terminal of the DC power supply;

[0050] The third indicator light, one end of which is connected to the other end of the ninth switch, and the other end of which is connected to the input terminal of the DC power supply;

[0051] The tenth switch, one end of which is connected to the output terminal of the DC power supply;

[0052] And a fourth indicator light, one end of which is connected to the other end of the tenth switch, and the other end of which is connected to the input terminal of the DC power supply.

[0053] By adopting the above technical solution, closing the first main switch, the first air switch, and the second air switch energizes the control power supply, thereby powering the control chip and the display screen. Then, closing the first and second start switches causes the first differential pressure sensor to detect that the air pressure in the first area exceeds the set value. In this case, the first output terminal outputs current, energizing the first intermediate relay, which in turn closes the seventh switch and the first forward switch, thus starting the first motor. The first indicator light illuminates, indicating that the first motor is rotating forward. When the first differential pressure sensor detects that the air pressure in the first area is lower than the set value, the second output terminal outputs current, energizing the second intermediate relay, which in turn closes the eighth switch and the first forward switch. When the first reverse switch closes, the first motor starts, and the second indicator light illuminates, indicating that the first motor is reversing. When the second differential pressure sensor detects that the air pressure in the second area exceeds the set value, the third output terminal outputs current, energizing the third intermediate relay, which in turn closes the ninth switch and the second forward switch, thus starting the second motor. The third indicator light illuminates, indicating that the second motor is rotating forward. When the second differential pressure sensor detects that the air pressure in the second area is lower than the set value, the fourth output terminal outputs current, energizing the fourth intermediate relay, which in turn closes the tenth switch and the second reverse switch, thus starting the second motor. The fourth indicator light illuminates, indicating that the second motor is reversing.

[0054] When the first motor needs to be manually started to rotate forward, the first switch is closed to control the output current of the first output terminal, energizing the first intermediate relay, which in turn closes the seventh switch and the first forward switch, thus starting the first motor. The first indicator light illuminates, indicating that the first motor is rotating forward. When the first motor needs to be manually started to rotate in reverse, the second output terminal outputs current, energizing the second intermediate relay, which in turn closes the eighth switch and the first reverse switch, thus starting the first motor. The second indicator light illuminates, indicating that the first motor is rotating in reverse. When the second motor needs to be manually started to rotate forward, the third output terminal outputs current, energizing the third intermediate relay, which in turn closes the ninth switch and the second forward switch, thus starting the second motor. The third indicator light illuminates, indicating that the second motor is rotating forward. When the second motor needs to be manually started to rotate in reverse, the fourth output terminal outputs current, energizing the fourth intermediate relay, which in turn closes the tenth switch and the second reverse switch, thus starting the second motor. The fourth indicator light illuminates, indicating that the second motor is rotating in reverse, thereby controlling the pressure in different areas.

[0055] In summary, this utility model has the following beneficial effects:

[0056] 1. By closing the first main switch, the first air switch, and the second air switch, the control power supply is energized, thereby powering the control chip and the display screen. Then, by closing the first start switch and the second start switch, when the first differential pressure sensor detects that the air pressure in the first area exceeds the set value, the first output terminal outputs current, energizing the first intermediate relay, which closes the seventh switch and the first forward switch, thereby starting the first motor. The first indicator light illuminates, indicating that the first motor is rotating forward. When the first differential pressure sensor detects that the air pressure in the first area is lower than the set value, the second output terminal outputs current, energizing the second intermediate relay, which closes the eighth switch and the first reverse switch. When the switch is closed, the first motor starts, and the second indicator light illuminates, indicating that the first motor is rotating in reverse. When the second differential pressure sensor detects that the air pressure in the second area exceeds the set value, the third output terminal outputs current, energizing the third intermediate relay, which closes the ninth switch and the second forward switch, thus starting the second motor. The third indicator light illuminates, indicating that the second motor is rotating in the forward direction. When the second differential pressure sensor detects that the air pressure in the second area is lower than the set value, the fourth output terminal outputs current, energizing the fourth intermediate relay, which closes the tenth switch and the second reverse switch, thus starting the second motor. The fourth indicator light illuminates, indicating that the second motor is rotating in reverse.

[0057] When the first motor needs to be manually started to rotate forward, the first switch is closed to control the output current at the first output terminal, energizing the first intermediate relay, which in turn closes the seventh switch and the first forward switch, thus starting the first motor. The first indicator light illuminates, indicating that the first motor is rotating forward. When the first motor needs to be manually started to rotate in reverse, the second output terminal outputs current, energizing the second intermediate relay, which in turn closes the eighth switch and the first reverse switch, thus starting the first motor. The second indicator light illuminates, indicating that the first motor is rotating in reverse. When the second motor needs to be manually started to rotate forward, the third output terminal outputs current, energizing the third intermediate relay, which in turn closes the ninth switch and the second forward switch, thus starting the second motor. The third indicator light illuminates, indicating that the second motor is rotating forward. When the second motor needs to be manually started to rotate in reverse, the fourth output terminal outputs current, energizing the fourth intermediate relay, which in turn closes the tenth switch and the second reverse switch, thus starting the second motor. The fourth indicator light illuminates, indicating that the second motor is rotating in reverse, thereby controlling the pressure in different areas. Attached Figure Description

[0058] Figure 1 This is the circuit schematic diagram of this utility model.

[0059] In the diagram, QF0 is the first main switch; QF1 is the first air switch; QF2 is the second air switch; QF3 is the second main switch; SB1 is the first start switch; KM1 is the first forward switch; M1 is the first motor; KM2 is the first reverse switch; F1 is the first fuse; QF4 is the third main switch; SB2 is the second start switch; KM3 is the second forward switch; KM4 is the second reverse switch; M2 is the second motor; F2 is the second fuse; 1M is the first common terminal; 0 is the first input terminal; 1 is the second input terminal; 2 is the third input terminal; 3 is the fourth input terminal; 4 is the fifth input terminal; 5 is the sixth input terminal; 6 is the second common terminal; I0 is the first signal input terminal; I1 is the first signal output terminal; I2 is the second signal input terminal; I 3. Second signal output terminal; L1. First power supply terminal; N. Second power supply terminal; PE. Ground terminal; 1L. Third common terminal; 7. First output terminal; 8. Second output terminal; 9. Third output terminal; 2L. Fourth common terminal; 10. Fourth output terminal; 11. Fifth output terminal; L2. Third power supply terminal; M. Fourth power supply terminal; SB3. Seventh switch; H1. First indicator light; SB4. Eighth switch; H2. Second indicator light; SB5. Ninth switch; H3. Third indicator light; SB6. Tenth switch; H4. Fourth indicator light. Detailed Implementation

[0060] The present invention will be further described in detail below with reference to the accompanying drawings.

[0061] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0062] Example 1:

[0063] like Figure 1 As shown, a laboratory pressure zoning control system includes a control cabinet, a first fan, a second fan, a first differential pressure sensor, and a second differential pressure sensor. The control cabinet is equipped with a control circuit. The first fan and the second fan are electrically connected to the control circuit, and the first differential pressure sensor and the second differential pressure sensor are electrically connected to the control circuit.

[0064] The control circuit includes a main power supply, a first main switch QF0, one end of which is connected to one end of the main power supply; a first air switch QF1, one end of which is connected to the other end of the main switch; a second air switch QF2, one end of which is connected to the other end of the first air switch QF1; a first regulating circuit, connected to the other end of the first air switch QF1; a second regulating circuit, also connected to the other end of the first air switch QF1; a control power supply, the AC terminal of which is connected to the other end of the second air switch QF2; a control chip, connected to the DC terminal of the control power supply; an indicator circuit, connected to the DC terminal of the control power supply; and a display screen, connected to the DC terminal of the control power supply.

[0065] The first regulating circuit includes a second main switch QF3, one end of which is connected to the other end of a first air switch QF1; a first start switch SB1, one end of which is connected to the other end of the second main switch QF3; a first forward switch KM1, one end of which is connected to the other end of the first start switch SB1; a first motor M1, one end of which is connected to the other end of the first forward switch KM1; a first reverse switch KM2, one end of which is connected to the middle position between the first start switch SB1 and the first forward switch KM1; and a first fuse F1, one end of which is connected to the other end of the first reverse switch KM2, and the other end of which is connected to the other end of the first motor M1.

[0066] The second regulating circuit includes a third main switch QF4, one end of which is connected to the other end of the second air switch QF2; a second start switch SB2, one end of which is connected to the other end of the third main switch QF4; a second forward switch KM3, one end of which is connected to the other end of the second start switch SB2; a second motor M2, one end of which is connected to the other end of the second forward switch KM3; a second reverse switch KM4, one end of which is connected to the middle position between the second start switch SB2 and the second forward switch KM3; and a second fuse F2, one end of which is connected to the other end of the second reverse switch KM4, and the other end of which is connected to the other end of the second motor M2.

[0067] The control chip has 24 ports, including a first common terminal 1M, a first input terminal 0, a second input terminal 1, a third input terminal 2, a fourth input terminal 3, a fifth input terminal 4, a sixth input terminal 5, a second common terminal 6, a first signal input terminal I0, a first signal output terminal I1, a second signal input terminal I2, a second signal output terminal I3, a first power supply terminal L1, a second power supply terminal N, a ground terminal PE, a third common terminal 1L, a first output terminal 7, a second output terminal 8, a third output terminal 9, a fourth common terminal 2L, a fourth output terminal 10, a fifth output terminal 11, a third power supply terminal L2, and a fourth power supply terminal M. The first common terminal 1M is connected to the DC input terminal of the control power supply. The first signal input terminal I0 is connected to one end of the first differential pressure sensor, and the other end of the first differential pressure sensor is connected to the first signal output terminal I1. The second signal input terminal I2 is connected to one end of the second differential pressure sensor, and the other end of the second differential pressure sensor is connected to the second signal output terminal I1. 3. Connections: First power supply terminal L1 is connected to the live wire of the main power supply; second power supply terminal N is connected to the neutral wire of the main power supply; grounding terminal PE is connected to the earth; third power supply terminal L2 is connected to the input terminal of the DC power supply of the control power supply; fourth power supply terminal M is connected to the output terminal of the DC power supply of the control power supply; third common terminal 1L is connected to the live wire of the main power supply; fourth common terminal 2L is connected to the live wire of the main power supply; first switch: one end of the first switch is connected to the first input terminal 0, and the other end of the first switch is connected to the second common terminal 6; second switch: one end of the second switch is connected to the second input terminal 1, and the other end of the second switch is connected to the second common terminal 6; third switch: one end of the third switch is connected to the third input terminal 2, and the other end of the third switch is connected to the second common terminal 6; fourth switch: one end of the fourth switch is connected to the fourth input terminal 3, and the other end of the fourth switch is connected to the second common terminal 6; fifth switch: one end of the fifth switch is connected to the fifth input terminal 4. Connect the fifth switch to the second common terminal 6. Connect the sixth switch to the sixth input terminal 5 and the second common terminal 6. Connect the first intermediate relay to the first output terminal 7 and the other end to the neutral wire of the main power supply. Connect the second intermediate relay to the second output terminal 8 and the other end to the neutral wire of the main power supply. Connect the third intermediate relay to the third output terminal 9 and the other end to the neutral wire of the main power supply. Connect the fourth intermediate relay to the fourth output terminal 10 and the other end to the neutral wire of the main power supply. Connect the fifth intermediate relay to the fifth output terminal 11 and the other end to the neutral wire of the main power supply.

[0068] The indicator circuit includes a seventh switch SB3, one end of which is connected to the output terminal of the DC power supply; a first indicator light H1, one end of which is connected to the other end of the seventh switch SB3 and the other end of which is connected to the input terminal of the DC power supply; an eighth switch SB4, one end of which is connected to the output terminal of the DC power supply; a second indicator light H2, one end of which is connected to the other end of the eighth switch SB4 and the other end of which is connected to the input terminal of the DC power supply; a ninth switch SB5, one end of which is connected to the output terminal of the DC power supply; a third indicator light H3, one end of which is connected to the other end of the ninth switch SB5 and the other end of which is connected to the input terminal of the DC power supply; a tenth switch SB6, one end of which is connected to the output terminal of the DC power supply; and a fourth indicator light H4, one end of which is connected to the other end of the tenth switch SB6 and the other end of which is connected to the input terminal of the DC power supply.

[0069] Specific implementation process: Close the first main switch QF0, the first air switch QF1, and the second air switch QF2 to energize the control power supply, thereby powering the control chip and display screen. Then close the first start switch SB1 and the second start switch SB2. When the first differential pressure sensor detects that the air pressure in the first area exceeds the set value, the first output terminal 7 outputs current, energizing the first intermediate relay, which closes the seventh switch SB3 and the first forward switch KM1, thereby starting the first motor M1. The first indicator light H1 illuminates, indicating that the first motor M1 is rotating forward. When the first differential pressure sensor detects that the air pressure in the first area is lower than the set value, the second output terminal 8 outputs current, energizing the second intermediate relay, which closes the eighth switch SB4 and the first reverse switch KM1. When switch KM2 is closed, the first motor M1 starts, and the second indicator light H2 illuminates, indicating that the first motor M1 is rotating in reverse. When the second differential pressure sensor detects that the air pressure in the second area exceeds the set value, the third output terminal 9 outputs current, energizing the third intermediate relay, which closes the ninth switch SB5 and the second forward switch KM3, thus starting the second motor M2. The third indicator light H3 illuminates, indicating that the second motor M2 is rotating in the forward direction. When the second differential pressure sensor detects that the air pressure in the second area is lower than the set value, the fourth output terminal 10 outputs current, energizing the fourth intermediate relay, which closes the tenth switch SB6 and the second reverse switch KM4, thus starting the second motor M2. The fourth indicator light H4 illuminates, indicating that the second motor M2 is rotating in reverse.

[0070] When manual starting of the first motor M1 for forward rotation is required, the first switch is closed, controlling the output current at the first output terminal 7. This energizes the first intermediate relay, causing the seventh switch SB3 and the first forward switch KM1 to close, thus starting the first motor M1. The first indicator light H1 illuminates, indicating that the first motor M1 is rotating forward. When manual starting of the first motor M1 for reverse rotation is required, the second output terminal 8 outputs current, energizing the second intermediate relay. This energizes the eighth switch SB4 and the first reverse switch KM2, thus starting the first motor M1. The second indicator light H2 illuminates, indicating that the first motor M1 is rotating in reverse. When the second motor M2 needs to be manually started to rotate forward, the third output terminal 9 outputs current, energizing the third intermediate relay, which in turn closes the ninth switch SB5 and the second forward switch KM3, thus starting the second motor M2. The third indicator light H3 illuminates, indicating that the second motor M2 is rotating forward. When the second motor M2 needs to be manually started to rotate in reverse, the fourth output terminal 10 outputs current, energizing the fourth intermediate relay, which in turn closes the tenth switch SB6 and the second reverse switch KM4, thus starting the second motor M2. The fourth indicator light H4 illuminates, indicating that the second motor M2 is rotating in reverse, thereby controlling the pressure in different areas.

[0071] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0072] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A laboratory pressure zoning control system, characterized by It includes a control cabinet, a first fan, a second fan, a first differential pressure sensor, and a second differential pressure sensor. The control cabinet is equipped with a control circuit. The first fan and the second fan are electrically connected to the control circuit. The first differential pressure sensor and the second differential pressure sensor are also electrically connected to the control circuit.

2. A laboratory pressure zoning control system according to claim 1, wherein: The control circuit includes: Main power supply; The first main switch, one end of which is connected to one end of the main power supply; A first air switch, one end of which is connected to the other end of the main switch; A second air switch, one end of which is connected to the other end of the first air switch; A first regulating circuit is connected to the other end of a first air switch; A second regulating circuit is connected to the other end of the first air switch; A control power supply, wherein the AC terminal of the control power supply is connected to the other end of the second air switch; A control chip, which is connected to the DC terminal of the control power supply; An indicator circuit, wherein the indicator circuit is connected to the DC terminal of the control power supply; and a display screen, which is connected to the DC terminal of the control power supply.

3. A laboratory pressure zoning control system according to claim 2, wherein: The first adjustment circuit includes: The second main switch, one end of which is connected to the other end of the first air switch; A first start switch, one end of which is connected to the other end of a second main switch; A first forward rotation switch, one end of which is connected to the other end of a first start switch; A first motor, one end of which is connected to the other end of a first forward rotation switch; A first reverse switch, one end of which is connected to the middle position between the first start switch and the first forward switch; A first fuse, one end of which is connected to the other end of a first reversing switch, and the other end of which is connected to the other end of a first motor.

4. The laboratory pressure zoning control system of claim 2, wherein: The second adjustment circuit includes: A third main switch, one end of which is connected to the other end of a second air switch; A second start switch, one end of which is connected to the other end of a third main switch; A second forward rotation switch, one end of which is connected to the other end of a second start switch; A second motor, one end of which is connected to the other end of a second forward rotation switch; The second reverse switch is connected at one end to the middle position of the second start switch and the second forward switch; The second fuse has one end connected to the other end of the second reversing switch and the other end connected to the other end of the second motor.

5. The laboratory pressure zoning control system of claim 2, wherein: The control chip has 24 ports, including a first common terminal, a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a second common terminal, a first signal input terminal, a first signal output terminal, a second signal input terminal, a second signal output terminal, a first power supply terminal, a second power supply terminal, a ground terminal, a third common terminal, a first output terminal, a second output terminal, a third output terminal, a fourth common terminal, a fourth output terminal, a fifth output terminal, a third power supply terminal, and a fourth power supply terminal. The first common terminal is connected to the DC input terminal of the control power supply, and the first signal input terminal is connected to the first common terminal. One end of a differential pressure sensor is connected, the other end of the first differential pressure sensor is connected to the first signal output terminal, the second signal input terminal is connected to one end of a second differential pressure sensor, the other end of the second differential pressure sensor is connected to the second signal output terminal, the first power supply terminal is connected to the live wire of the main power supply, the second power supply terminal is connected to the neutral wire of the main power supply, the grounding terminal is connected to the earth, the third power supply terminal is connected to the input terminal of the DC terminal of the control power supply, the fourth power supply terminal is connected to the output terminal of the DC terminal of the control power supply, the third common terminal is connected to the live wire of the main power supply, and the fourth common terminal is connected to the live wire of the main power supply. A first switch, one end of which is connected to a first input terminal, and the other end of which is connected to a second common terminal; A second switch, one end of which is connected to a second input terminal, and the other end of which is connected to a second common terminal; A third switch, one end of which is connected to a third input terminal, and the other end of which is connected to a second common terminal; The fourth switch has one end connected to the fourth input terminal and the other end connected to the second common terminal. The fifth switch has one end connected to the fifth input terminal and the other end connected to the second common terminal. The sixth switch, one end of which is connected to the sixth input terminal, and the other end of which is connected to the second common terminal; The first intermediate relay has one end connected to the first output terminal and the other end connected to the neutral wire of the main power supply. The second intermediate relay has one end connected to the second output terminal and the other end connected to the neutral wire of the main power supply. The third intermediate relay, one end of which is connected to the third output terminal, and the other end of which is connected to the neutral wire of the main power supply; The fourth intermediate relay, one end of which is connected to the fourth output terminal, and the other end of which is connected to the neutral line of the main power supply; And a fifth intermediate relay, one end of which is connected to the fifth output terminal, and the other end of which is connected to the neutral line of the main power supply.

6. The laboratory pressure zoning control system of claim 2, wherein: The indicating circuit includes: The seventh switch, one end of which is connected to the output terminal of the DC power supply; The first indicator light has one end connected to the other end of the seventh switch, and the other end of the first indicator light is connected to the input terminal of the DC power supply. The eighth switch, one end of which is connected to the output terminal of the DC power supply; The second indicator light has one end connected to the other end of the eighth switch, and the other end connected to the input terminal of the DC power supply. The ninth switch, one end of which is connected to the output terminal of the DC power supply; The third indicator light, one end of which is connected to the other end of the ninth switch, and the other end of which is connected to the input terminal of the DC power supply; The tenth switch, one end of which is connected to the output terminal of the DC power supply; And a fourth indicator light, one end of which is connected to the other end of the tenth switch, and the other end of which is connected to the input terminal of the DC power supply.

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