Negative pressure control device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses and provides a negative pressure control device which comprises a controller, a negative pressure pump, a tee joint, a negative pressure sensor and an electromagnetic valve. An extraction opening of the negative pressure pump is connected with a first port of the tee joint, and a third port of the tee joint is used for outputting negative pressure; the electromagnetic valve is used for controlling the opening or closing of the second port of the tee joint; the negative pressure sensor is used for sensing the output negative pressure of the negative pressure pump, and the controller is used for controlling the electromagnetic valve and the negative pressure pump according to the output negative pressure. According to the utility model, the reasonable structure of the load control device is constructed, so that the injection mechanism can be controlled to finish needle withdrawing and needle returning to the skin. And conditions are created for automatic injection.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a negative pressure control device. Background Art

[0002] Automated injection equipment usually refers to automatic injectors, which are devices that can automatically complete injection operations. This type of equipment can complete injection operations according to the set program without human intervention. For automated injection equipment, its core technology lies in how to control negative pressure. Therefore, how to construct a reasonable negative pressure control device is a topic that needs to be studied urgently in the industry. Utility Model Content

[0003] The purpose of the utility model is to provide a negative pressure control device to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The utility model solves the technical problem by providing a negative pressure control device, including a controller, a negative pressure pump, a three-way connection, a negative pressure sensor and a solenoid valve;

[0005] The suction port of the negative pressure pump is connected to the first port of the tee, and the third port of the tee is used to output negative pressure; the solenoid valve is used to control the opening or closing of the second port of the tee; the negative pressure sensor is used to sense the output negative pressure of the negative pressure pump, and the controller is used to control the solenoid valve and the negative pressure pump according to the output negative pressure.

[0006] Furthermore, the controller includes: a main control module, a negative pressure pump drive module and a solenoid valve control module; the main control module is connected to the negative pressure pump drive module and the solenoid valve control module respectively, and the main control module is used to drive the negative pressure pump to generate an output negative pressure through the negative pressure pump drive module; the main control module is used to control the solenoid valve through the solenoid valve control module.

[0007] Furthermore, the negative pressure pump drive module includes: a first drive module and a pump pressure control module; the first drive module is used to drive the rotation of the working motor of the negative pressure pump, and the pump pressure control module is used to control the speed of the working motor of the negative pressure pump; the main control module is respectively connected to the first drive module and the pump pressure control module.

[0008] Further, the first driving module includes: a first power supply end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first triode, a second triode, a third triode and a fourth triode;

[0009] The first power supply end is respectively connected to the positive electrode of the first capacitor, one end of the second capacitor, one end of the third capacitor, one end of the first resistor and the drain of the first transistor;

[0010] The source of the first transistor is connected to the drain of the third stage and one end of the fourth resistor respectively; the source of the third transistor is connected to the positive electrode of the working motor of the negative pressure pump;

[0011] The gate of the first transistor is respectively connected to the other end of the first resistor and the drain of the second transistor, the gate of the second transistor is respectively connected to one end of the fourth capacitor, one end of the second resistor and one end of the third resistor, and the other end of the second resistor is connected to the first universal interface of the main control module;

[0012] The gate of the third triode is respectively connected to the other end of the fourth resistor and one end of the fifth resistor, the other end of the fifth resistor is connected to the drain of the fourth triode, the gate of the fourth triode is respectively connected to one end of the fifth capacitor, one end of the sixth resistor and one end of the seventh resistor, and the other end of the sixth resistor is connected to the second universal interface of the main control module;

[0013] The negative electrode of the first capacitor, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the third resistor, the other end of the seventh resistor, the source of the fourth transistor and the negative electrode of the working motor of the negative pressure pump are all connected to the ground terminal.

[0014] Further, the pump pressure control module includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first voltage stabilizing diode and a fifth triode; the cathode of the first voltage stabilizing diode and one end of the fourteenth resistor are respectively connected to the third universal interface of the main control module;

[0015] The anode of the first voltage stabilizing diode is respectively connected to the other end of the fourteenth resistor, one end of the thirteenth resistor and the gate of the fifth triode;

[0016] The drain of the fifth transistor is respectively connected to one end of the twelfth resistor and the control end of the working motor of the negative pressure pump; the other end of the twelfth resistor is connected to the second power supply end.

[0017] Furthermore, the negative pressure control device also includes a third power supply terminal and an eleventh resistor, wherein the third power supply terminal is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the drain of the fifth transistor.

[0018] Furthermore, the third power supply terminal is connected to a backup power supply.

[0019] Further, the solenoid valve control module includes: a second driving module and an adapting module;

[0020] The second driving module is used to drive the working motor of the solenoid valve, and the adapting module is used to convert the output voltage of the second driving module into a working voltage adapted to the solenoid valve.

[0021] Further, the second driving module includes: a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a sixth triode, a seventh triode, an eighth triode and a ninth triode;

[0022] The positive electrode of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the sixteenth resistor and the drain of the sixth transistor are respectively connected to the first power supply end, the source of the sixth transistor is respectively connected to one end of the eighteenth resistor and the drain of the eighth transistor, and the source of the eighth transistor is connected to the positive electrode of the solenoid valve;

[0023] The gate of the sixth triode is respectively connected to the other end of the sixteenth resistor and one end of the seventeenth resistor, the other end of the seventeenth resistor is connected to the drain of the seventh triode, the gate of the seventh triode is respectively connected to one end of the fifteenth resistor, one end of the twenty-second resistor and one end of the tenth capacitor, and the other end of the fifteenth resistor is connected to the fourth universal interface of the main control module;

[0024] The gate of the eighth triode is respectively connected to the other end of the eighteenth resistor and one end of the nineteenth resistor, the other end of the nineteenth resistor is connected to the drain of the ninth triode, the gate of the ninth triode is respectively connected to one end of the twentieth resistor, one end of the twenty-first resistor and one end of the eleventh capacitor, and the other end of the twentieth resistor is connected to the fifth universal interface of the main control module;

[0025] The negative electrode of the seventh capacitor, the other end of the eighth capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the twenty-second resistor, the source of the seventh transistor, the other end of the eleventh capacitor, the other end of the twenty-first resistor and the source of the ninth transistor are all connected to the ground.

[0026] Further, the adapter module includes: a second voltage stabilizing diode and a twelfth capacitor; the cathode of the second voltage stabilizing diode and one end of the twelfth capacitor are respectively connected to the anode of the solenoid valve; the anode of the second voltage stabilizing diode and the other end of the twelfth capacitor are respectively connected to the ground terminal.

[0027] The beneficial effect of the utility model is that the utility model constructs a reasonable structure of the load control device, so that the injection mechanism can be controlled to complete the needle withdrawal and needle return to the skin, thus creating conditions for automatic injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following is a brief description of the drawings required for the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present utility model, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the negative pressure control device;

[0030] Figure 2 Schematic diagram of the circuit structure of the negative pressure pump driving module;

[0031] Figure 3 It is a circuit structure diagram of the solenoid valve control module. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that, although the functional modules are divided in the system schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0034] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a structural schematic diagram of a negative pressure control device. Figure 2 It is a schematic diagram of the circuit structure of the negative pressure pump drive module. Figure 3 It is a circuit structure diagram of the solenoid valve control module.

[0035] The utility model discloses a negative pressure control device, comprising: a controller 100, a negative pressure pump 300, a three-way valve 400, a negative pressure sensor 200 and a solenoid valve 500.

[0036] The suction port of the negative pressure pump 300 is connected to the first port of the tee 400, and the third port of the tee 400 is used to output negative pressure; the solenoid valve 500 is used to control the opening or closing of the second port of the tee 400; the negative pressure sensor 200 is used to sense the output negative pressure of the negative pressure pump 300, and the controller 100 is used to control the solenoid valve 500 and the negative pressure pump 300 according to the output negative pressure.

[0037] The utility model discloses a structure of a negative pressure control device, wherein a negative pressure pump 300 can output negative pressure to the outside under controlled conditions. The negative pressure acts on the injection mechanism to realize the needle withdrawal or needle return to the skin, thereby realizing the function of automatic injection.

[0038] The negative pressure sensor 200 can detect the output negative pressure of the negative pressure pump 300 and transmit the detection result to the controller 100. The controller 100 can control the negative pressure pump 300 and the solenoid valve 500 according to the detection result.

[0039] When it is necessary to remove the needle from the skin, the controller 100 can control the negative pressure pump 300 to reduce the negative pressure output by the negative pressure pump 300. By controlling the solenoid valve 500, the second port of the three-way valve 400 is opened. Since the injection mechanism is provided with a needle removal spring, under the action of the needle removal spring, the injection mechanism removes the needle and acts on the skin, thereby completing the removal of the needle from the skin.

[0040] When it is necessary to perform skin needle return, the controller 100 can control the negative pressure pump 300 so that the suction port of the negative pressure pump 300 generates negative pressure, and the negative pressure passes through the first port of the three-way 400 and acts on the third port of the three-way 400. In order to release the negative pressure to the outside, the controller 100 controls the electromagnetic valve 500 to close the second port of the three-way 400. In this way, the negative pressure can act on the injection mechanism to complete the skin needle return.

[0041] The utility model constructs a reasonable load control device structure, so that the injection mechanism can be controlled to complete the needle withdrawal and needle return to the skin, creating conditions for automatic injection.

[0042] Regarding the structure of the controller 100 , in some further specific embodiments, the controller 100 includes: a main control module, a negative pressure pump drive module and a solenoid valve control module.

[0043] The main control module is used to output control signals to the negative pressure pump driving module and the solenoid valve control module. The control signal output by the main control module enables the negative pressure pump driving module to drive the negative pressure pump 300 to output negative pressure. The control signal output by the main control module enables the solenoid valve control module to control the solenoid valve 500 to open or close the second port of the three-way 400.

[0044] For the negative pressure pump driving module, in some further specific embodiments, the negative pressure pump driving module includes: a first driving module 101 and a pump pressure control module 102; the first driving module 101 is used to drive the rotation of the working motor of the negative pressure pump 300, and the pump pressure control module 102 is used to control the speed of the working motor of the negative pressure pump 300; the main control module is respectively connected to the first driving module 101 and the pump pressure control module 102.

[0045] Among them, the first driving module 101 includes: a first power supply terminal 12V_VCC, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first transistor Q1, a second transistor Q2, a third transistor Q3 and a fourth transistor Q4.

[0046] The first power supply terminal 12V_VCC is respectively connected to the positive electrode of the first capacitor C1, one end of the second capacitor C2, one end of the third capacitor C3, one end of the first resistor R1 and the drain of the first transistor Q1. The source of the first transistor Q1 is respectively connected to the drain of the third transistor and one end of the fourth resistor R4; the source of the third transistor Q3 is connected to the positive electrode of the working motor of the negative pressure pump 300.

[0047] The gate of the first transistor Q1 is respectively connected to the other end of the first resistor R1 and the drain of the second transistor Q2, the gate of the second transistor Q2 is respectively connected to one end of the fourth capacitor C4, one end of the second resistor R2 and one end of the third resistor R3, and the other end of the second resistor R2 is connected to the first universal interface Pump_EN_M of the main control module.

[0048] The gate of the third transistor Q3 is respectively connected to the other end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the drain of the fourth transistor Q4, the gate of the fourth transistor Q4 is respectively connected to one end of the fifth capacitor C5, one end of the sixth resistor R6 and one end of the seventh resistor R7, and the other end of the sixth resistor R6 is connected to the second universal interface Pump_EN_S of the main control module.

[0049] The negative electrode of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, the other end of the third resistor R3, the other end of the seventh resistor R7, the source of the fourth transistor Q4 and the negative electrode of the working motor of the negative pressure pump 300 are all connected to the ground terminal GND.

[0050] When the negative pressure pump 300 is required to generate negative pressure, the first universal interface Pump_EN_M and the second universal interface Pump_EN_S of the main control module output a low level. Under the action of the low level, the second transistor Q2 and the fourth transistor Q4 are cut off, so that the first transistor Q1 and the third transistor Q3 are turned on. The first power supply terminal 12V_VCC acts on the positive pole of the working motor of the negative pressure pump 300, so that the working motor of the negative pressure pump 300 works. Thereby, the negative pressure pump 300 generates negative pressure. As for the size of the negative pressure, the size of the negative pressure can be controlled by the pump pressure control module 102.

[0051] In some further specific embodiments, the pump pressure control module 102 includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a first voltage zener diode D1 and a fifth transistor Q5; the cathode of the first voltage zener diode D1 and one end of the fourteenth resistor R14 are respectively connected to the third universal interface Pump_PWM of the main control module; the anode of the first voltage zener diode D1 is respectively connected to the other end of the fourteenth resistor R14, one end of the thirteenth resistor R13 and the gate of the fifth transistor Q5; the drain of the fifth transistor Q5 is respectively connected to one end of the twelfth resistor R12 and the control end of the working motor of the negative pressure pump 300; the other end of the twelfth resistor R12 is connected to the second power supply terminal 5V_VCC.

[0052] The third universal interface Pump_PWM of the main control module outputs a PWM signal, and the PWM signal acts on the control end of the working motor of the negative pressure pump 300 through the fifth transistor Q5, thereby realizing the control of the speed of the working motor of the negative pressure pump 300.

[0053] In order to ensure that the pump pressure control module 102 has reliable power supply, in some further specific embodiments, the negative pressure control device further includes a third power supply terminal 5V_BAT and an eleventh resistor R11, wherein the third power supply terminal 5V_BAT is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the drain of the fifth transistor Q5. The third power supply terminal 5V_BAT is connected to a backup power supply. The dual power supply of the second power supply terminal 5V_VCC and the third power supply terminal 5V_BAT improves the reliability of the power supply of the pump pressure control module 102.

[0054] For the control part of the solenoid valve 500, in some further specific embodiments, the solenoid valve control module includes: a second drive module 110 and an adaptation module 120; the second drive module 110 is used to drive the working motor of the solenoid valve 500, and the adaptation module 120 is used to convert the output voltage of the second drive module 110 into a working voltage adapted to the solenoid valve 500.

[0055] The second driving module 110 includes: a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8 and a ninth transistor Q9.

[0056] The positive electrode of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the ninth capacitor C9, one end of the sixteenth resistor R16 and the drain of the sixth transistor Q6 are respectively connected to the first power supply terminal 12V_VCC, the source of the sixth transistor Q6 is respectively connected to one end of the eighteenth resistor R18 and the drain of the eighth transistor Q8, and the source of the eighth transistor Q8 is connected to the positive electrode of the solenoid valve 500.

[0057] The gate of the sixth transistor Q6 is respectively connected to the other end of the sixteenth resistor R16 and one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to the drain of the seventh transistor Q7, the gate of the seventh transistor Q7 is respectively connected to one end of the fifteenth resistor R15, one end of the twenty-second resistor R22 and one end of the tenth capacitor C10, and the other end of the fifteenth resistor R15 is connected to the fourth universal interface Valve_EN_M of the main control module.

[0058] The gate of the eighth transistor Q8 is respectively connected to the other end of the eighteenth resistor R18 and one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected to the drain of the ninth transistor Q9, the gate of the ninth transistor Q9 is respectively connected to one end of the twentieth resistor R20, one end of the twenty-first resistor R21 and one end of the eleventh capacitor C11, and the other end of the twentieth resistor R20 is connected to the fifth universal interface Valve_EN_S of the main control module.

[0059] The negative electrode of the seventh capacitor C7, the other end of the eighth capacitor C8, the other end of the ninth capacitor C9, the other end of the tenth capacitor C10, the other end of the twenty-second resistor R22, the source of the seventh transistor Q7, the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21 and the source of the ninth transistor Q9 are all connected to the ground terminal GND.

[0060] Among them, the adaptation module 120 includes: a second voltage stabilizing diode D2 and a twelfth capacitor C12; the cathode of the second voltage stabilizing diode D2 and one end of the twelfth capacitor C12 are respectively connected to the anode of the solenoid valve 500; the anode of the second voltage stabilizing diode D2 and the other end of the twelfth capacitor C12 are respectively connected to the ground terminal GND.

[0061] When the electromagnetic valve 500 needs to be controlled to open, a low level is generated through the fourth universal interface Valve_EN_M and the fifth universal interface Valve_EN_S of the main control module. Under the action of the low level, the seventh transistor Q7 and the ninth transistor Q9 are turned off, so that the sixth transistor Q6 and the eighth transistor Q8 are turned on. The first power supply terminal 12V_VCC acts on the positive pole of the electromagnetic valve 500, so that the electromagnetic valve 500 works. Thereby, the second port of the three-way 400 is opened. When the electromagnetic valve 500 needs to be controlled to close, a high level is generated through the fourth universal interface Valve_EN_M and the fifth universal interface Valve_EN_S of the main control module. Under the action of the high level, the seventh transistor Q7 and the ninth transistor Q9 are turned on, so that the sixth transistor Q6 and the eighth transistor Q8 are turned off. The first power supply terminal 12V_VCC does not act on the positive pole of the electromagnetic valve 500, so that the electromagnetic valve 500 does not work. Thereby, the second port of the tee 400 is closed.

[0062] Of course, in order to monitor the working condition of the working motor of the negative pressure pump 300, in some further specific embodiments, the negative pressure control device also includes a first monitoring circuit 103. The first monitoring circuit 103 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a sixth capacitor C6 and a third voltage zener diode D3. One end of the eighth resistor R8 is connected to the positive electrode of the working motor of the negative pressure pump 300, and the other end of the eighth resistor R8 is respectively connected to the negative electrode of the third voltage zener diode D3, one end of the sixth capacitor C6, one end of the ninth resistor R9 and one end of the tenth resistor R10, and the positive electrode of the third voltage zener diode D3, the other end of the sixth capacitor C6 and the other end of the ninth resistor R9 are respectively connected to the digital ground terminal GND. The other end of the tenth resistor R10 is connected to the sixth universal interface ADC1 of the main control module.

[0063] The sixth universal interface ADC1 of the main control module is set to analog-to-digital conversion mode, and the voltage of the positive electrode of the working motor of the negative pressure pump 300 is collected through the analog-to-digital conversion mode, so as to monitor the working condition of the working motor of the negative pressure pump 300.

[0064] In order to monitor the working condition of the solenoid valve 500, in some further specific embodiments, the negative pressure control device further includes a second monitoring circuit 130. The second monitoring circuit 130 includes: a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, an eleventh capacitor C11 and a fourth voltage-stabilizing diode D4. One end of the twenty-fifth resistor R25 is connected to the positive electrode of the solenoid valve 500, and the other end of the twenty-fifth resistor R25 is respectively connected to the negative electrode of the fourth voltage-stabilizing diode D4, one end of the eleventh capacitor C11, one end of the twenty-third resistor R23 and one end of the twenty-fourth resistor R24. The positive electrode of the fourth voltage-stabilizing diode D4, the other end of the eleventh capacitor C11 and the other end of the twenty-third resistor R23 are respectively connected to the digital ground terminal GND, and the other end of the twenty-fourth resistor R24 ​​is connected to the seventh universal interface ADC2 of the main control module.

[0065] The seventh universal interface ADC2 of the main control module is set to an analog-to-digital conversion mode, and the voltage of the positive electrode of the solenoid valve 500 is collected through the analog-to-digital conversion mode, so as to monitor the working condition of the solenoid valve 500.

[0066] The preferred implementation modes of the present invention are specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A negative pressure control device, characterized in that: include: Controller, negative pressure pump, three-way, negative pressure sensor and solenoid valve; The suction port of the negative pressure pump is connected to the first port of the tee, and the third port of the tee is used to output negative pressure; the solenoid valve is used to control the opening or closing of the second port of the tee; the negative pressure sensor is used to sense the output negative pressure of the negative pressure pump, and the controller is used to control the solenoid valve and the negative pressure pump according to the output negative pressure.

2. A negative pressure control device according to claim 1, characterized in that: The controller includes: a main control module, a negative pressure pump drive module and a solenoid valve control module; the main control module is connected to the negative pressure pump drive module and the solenoid valve control module respectively, and the main control module is used to drive the negative pressure pump to generate an output negative pressure through the negative pressure pump drive module; the main control module is used to control the solenoid valve through the solenoid valve control module.

3. A negative pressure control device according to claim 2, characterized in that: The negative pressure pump driving module includes: a first driving module and a pump pressure control module; the first driving module is used to drive the rotation of the working motor of the negative pressure pump, and the pump pressure control module is used to control the speed of the working motor of the negative pressure pump; the main control module is respectively connected to the first driving module and the pump pressure control module.

4. A negative pressure control device according to claim 3, characterized in that: The first driving module includes: a first power supply end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first triode, a second triode, a third triode and a fourth triode; The first power supply end is respectively connected to the positive electrode of the first capacitor, one end of the second capacitor, one end of the third capacitor, one end of the first resistor and the drain of the first transistor; the source of the first transistor is respectively connected to the drain of the third transistor and one end of the fourth resistor; the source of the third transistor is connected to the positive electrode of the working motor of the negative pressure pump; The gate of the first transistor is respectively connected to the other end of the first resistor and the drain of the second transistor, the gate of the second transistor is respectively connected to one end of the fourth capacitor, one end of the second resistor and one end of the third resistor, and the other end of the second resistor is connected to the first universal interface of the main control module; The gate of the third triode is respectively connected to the other end of the fourth resistor and one end of the fifth resistor, the other end of the fifth resistor is connected to the drain of the fourth triode, the gate of the fourth triode is respectively connected to one end of the fifth capacitor, one end of the sixth resistor and one end of the seventh resistor, and the other end of the sixth resistor is connected to the second universal interface of the main control module; The negative electrode of the first capacitor, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the third resistor, the other end of the seventh resistor, the source of the fourth transistor and the negative electrode of the working motor of the negative pressure pump are all connected to the ground terminal.

5. A negative pressure control device according to claim 3, characterized in that: The pump pressure control module includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first voltage stabilizing diode and a fifth triode; the cathode of the first voltage stabilizing diode and one end of the fourteenth resistor are respectively connected to the third universal interface of the main control module; The anode of the first voltage-stabilizing diode is respectively connected to the other end of the fourteenth resistor, one end of the thirteenth resistor and the gate of the fifth transistor; the drain of the fifth transistor is respectively connected to one end of the twelfth resistor and the control end of the working motor of the negative pressure pump; the other end of the twelfth resistor is connected to the second power supply end.

6. A negative pressure control device according to claim 5, characterized in that: It also includes a third power supply terminal and an eleventh resistor, wherein the third power supply terminal is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the drain of the fifth transistor.

7. A negative pressure control device according to claim 6, characterized in that: The third power supply terminal is connected to a backup power supply.

8. A negative pressure control device according to claim 2, characterized in that: The solenoid valve control module includes: a second driving module and an adapting module; the second driving module is used to drive the working motor of the solenoid valve, and the adapting module is used to convert the output voltage of the second driving module into a working voltage adapted to the solenoid valve.

9. A negative pressure control device according to claim 8, characterized in that: The second driving module includes: a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a sixth triode, a seventh triode, an eighth triode and a ninth triode; The positive electrode of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the sixteenth resistor and the drain of the sixth transistor are respectively connected to the first power supply end, the source of the sixth transistor is respectively connected to one end of the eighteenth resistor and the drain of the eighth transistor, and the source of the eighth transistor is connected to the positive electrode of the solenoid valve; The gate of the sixth triode is respectively connected to the other end of the sixteenth resistor and one end of the seventeenth resistor, the other end of the seventeenth resistor is connected to the drain of the seventh triode, the gate of the seventh triode is respectively connected to one end of the fifteenth resistor, one end of the twenty-second resistor and one end of the tenth capacitor, and the other end of the fifteenth resistor is connected to the fourth universal interface of the main control module; The gate of the eighth triode is respectively connected to the other end of the eighteenth resistor and one end of the nineteenth resistor, the other end of the nineteenth resistor is connected to the drain of the ninth triode, the gate of the ninth triode is respectively connected to one end of the twentieth resistor, one end of the twenty-first resistor and one end of the eleventh capacitor, and the other end of the twentieth resistor is connected to the fifth universal interface of the main control module; The negative electrode of the seventh capacitor, the other end of the eighth capacitor, the other end of the ninth capacitor, the other end of the tenth capacitor, the other end of the twenty-second resistor, the source of the seventh transistor, the other end of the eleventh capacitor, the other end of the twenty-first resistor and the source of the ninth transistor are all connected to the ground.

10. A negative pressure control device according to claim 8, characterized in that: The adapter module includes: a second zener diode and a twelfth capacitor; the cathode of the second zener diode and one end of the twelfth capacitor are respectively connected to the anode of the solenoid valve; the anode of the second zener diode and the other end of the twelfth capacitor are respectively connected to the ground terminal.

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