Suction system, suction device and dental chair

Abstract

The invention provides a suction system, a suction device and a dental chair, the suction system is applied to the suction device, and the suction device comprises a liquid storage cavity used for containing liquid and comprises a suction module, a liquid drainage module and a control module; the suction module is used for sucking liquid and gas into the liquid storage cavity, the gas is discharged out of the liquid storage cavity through the suction module, and the liquid is left in the liquid storage cavity; the liquid discharging module is used for discharging the liquid from the liquid storage cavity; the control module is used for starting or stopping the suction module and the drainage module; the control module is configured to close the liquid discharging module under the condition that the suction module is started and close the suction module under the condition that the liquid discharging module is started, so that the suction module and the liquid discharging module cannot be started at the same time; therefore, the situation that the suction system breaks down due to the fact that the suction module and the liquid discharging module are started at the same time is prevented.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and in particular, relates to a suction system, a suction device and a dental chair. Background Art

[0002] In the current medical, dental, industrial cleaning and other fields, the suction system plays a vital role, especially in the scene that requires efficient removal of liquids, gases or mixtures. However, the suction device and the drainage device of the existing suction system are prone to synchronous operation, which directly leads to the decrease of system stability, the increase of failure rate and the increase of maintenance cost.

[0003] Current suction systems often have no or only simple logic control to distinguish between the two independent processes of suction and drainage. In actual operation, when the negative pressure pump starts working, it performs the tasks of suction and preliminary drainage at the same time, but due to the lack of an effective separation mechanism or timing control, the two processes are prone to interfere with each other, causing pressure fluctuations in the system, unstable flow, and even causing faults such as liquid reflux and pipe blockage.

[0004] Therefore, how to reduce the failure of the suction system is a problem that those skilled in the art currently need to solve. Summary of the invention

[0005] The purpose of the present application is to provide a suction system, a suction device and a dental chair, aiming to solve the problem that the suction system in the traditional technology is prone to malfunction.

[0006] A first aspect of an embodiment of the present application provides a suction system, wherein the suction system is applied to a suction device, and the suction device includes a liquid storage chamber for containing liquid, and the suction system includes:

[0007] A suction module, the suction module is used to suck the liquid and gas to be sucked into the liquid storage cavity, the gas is discharged from the liquid storage cavity through the suction module, and the liquid remains in the liquid storage cavity;

[0008] A liquid discharge module, the liquid discharge module is used to discharge the liquid from the liquid storage chamber;

[0009] A control module, the control module is used to start or shut down the suction module and the drainage module; wherein the control module is configured to shut down the drainage module when the suction module is started; and to shut down the suction module when the drainage module is started.

[0010] In some embodiments of the present application, the suction system further includes:

[0011] A first access terminal and a second access terminal, wherein the first access terminal is used to access one of the live wire and the neutral wire of the external power supply, and the second access terminal is used to access the other of the live wire and the neutral wire of the external power supply; the second access terminal is also connected to the suction module and the drainage module;

[0012] a first switch element, the first switch element having a fixed end and a movable end, the fixed end being connected to the first access end, and the movable end being switchably connected between the suction module and the drainage module;

[0013] Wherein, the first switch is configured to selectively connect between the suction module and the drainage module under the control of the control module.

[0014] In some embodiments of the present application, the suction system also includes a liquid level detection module, which is used to detect the liquid level in the liquid storage chamber and to send a detection signal according to the liquid level in the liquid storage chamber; the control module is used to control the first switch to select a connection between the suction module and the drainage module according to the detection signal.

[0015] In some embodiments of the present application, the liquid level detection module is used to output a first sub-detection signal when the liquid level in the liquid storage chamber is higher than a first liquid level, and is used to output a second sub-detection signal when the liquid level in the liquid storage chamber is higher than a second liquid level and lower than the first liquid level, and is used to output a third sub-detection signal when the liquid level in the liquid storage chamber is lower than the second liquid level; the first liquid level is higher than the second liquid level;

[0016] The control module is used to control the first switch element to connect to the discharge module or the suction module according to one of the first sub-detection signal, the second sub-detection signal and the third sub-detection signal.

[0017] In some embodiments of the present application, the liquid level detection module includes a high liquid level probe and a low liquid level probe, and the high liquid level probe and the low liquid level probe are used to jointly output the first sub-detection signal, the second sub-detection signal and the third sub-detection signal;

[0018] Wherein, the high liquid level probe and the low liquid level probe are configured such that when the liquid level in the liquid storage chamber is higher than the first liquid level, the high liquid level probe and the low liquid level probe output a high level signal to form the first sub-detection signal; when the liquid level in the liquid storage chamber is higher than the second liquid level and lower than the first liquid level, the high liquid level probe outputs a low level signal and the low liquid level probe outputs a high level signal to form the second sub-detection signal; when the liquid level in the liquid storage chamber is lower than the second liquid level, the high liquid level probe and the low liquid level probe output a low level signal to form the third sub-detection signal.

[0019] In some embodiments of the present application, the control module includes:

[0020] a first comparison unit, connected to the high liquid level probe, and outputting a first output signal after comparing the signal of the high liquid level probe with a first preset value, wherein the first output signal is used to adjust the first switch to connect to the liquid discharge module;

[0021] The second comparison unit is connected to the low liquid level probe, and outputs a second output signal after comparing the signal of the low liquid level probe with a second preset value, wherein the second output signal is used to adjust the first switch to connect to the suction module.

[0022] In some embodiments of the present application, the control module further includes:

[0023] A voltage follower unit, used for outputting a fixed signal;

[0024] A hysteresis comparison unit, wherein the positive input terminal of the hysteresis comparison unit is used to access the first output signal and the second output signal; the negative input terminal of the hysteresis comparison unit is used to access the fixed signal; wherein the hysteresis comparison unit is used to output a first control signal according to the first output signal, the second output signal and the fixed signal, and the first control signal is used to control the first switch element to select one of the suction module and the discharge module for connection.

[0025] In some embodiments of the present application, the hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the drainage module when the liquid level in the liquid storage chamber drops from the first liquid level to the second liquid level; and / or, the hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the suction module when the liquid level in the liquid storage chamber rises from the second liquid level to the first liquid level.

[0026] In a second aspect, the present application also provides a suction device, which includes the above-mentioned suction system.

[0027] In a third aspect, the present application also provides a dental chair comprising the above-mentioned suction device.

[0028] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: in the above-mentioned suction system, suction device and dental chair, the suction system is applied to the suction device, and the suction device includes a liquid storage chamber for accommodating liquid, including a suction module, a drainage module and a control module; the suction module is used to suck the liquid and gas to be sucked into the liquid storage chamber, the gas is discharged from the liquid storage chamber through the suction module, and the liquid remains in the liquid storage chamber; the drainage module is used to discharge the liquid from the liquid storage chamber; the control module is used to start or shut down the suction module and the drainage module; the present application sets the control module to be configured to shut down the drainage module when the suction module is started, and to shut down the suction module when the drainage module is started, so that the suction module and the drainage module cannot be started at the same time, which is beneficial to prevent the suction system from malfunctioning due to the simultaneous start of the suction module and the drainage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the framework structure of a suction system provided in one embodiment of the present application;

[0030] Figure 2 A schematic diagram of the framework structure of a suction system provided in another embodiment of the present application;

[0031] Figure 3 A schematic diagram of the circuit structure of a liquid level detection module provided in one embodiment of the present application;

[0032] Figure 4 A schematic diagram of the circuit structure of a control module provided in one embodiment of the present application;

[0033] Figure 5 A schematic diagram of the circuit structure of a suction system provided in yet another embodiment of the present application;

[0034] Figure 6 A schematic diagram of the circuit structure of a suction system provided in yet another embodiment of the present application;

[0035] Figure 7 A schematic diagram of the circuit structure of a suction system provided in yet another embodiment of the present application.

[0036] Specific element symbol description: 100 - suction module, 200 - drainage module, 300 - control module, 400 - first access end, 500 - second access end, 600 - first switch component, 700 - second switch component. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] It is important to know that in the current medical, dental, industrial cleaning and other fields, the suction system plays a vital role, especially in the scene that requires efficient removal of liquids, gases or mixtures. However, the existing suction system generally has a significant technical difficulty in design, that is, the suction and drainage processes are prone to synchronous operation, which directly leads to reduced system stability, increased failure rate and increased maintenance costs.

[0042] Specifically, traditional suction systems often have no or only simple logic control to distinguish between the two independent processes of suction and drainage. In actual operation, when the negative pressure pump starts working, it performs the tasks of suction and preliminary drainage at the same time, but due to the lack of an effective separation mechanism or timing control, the two processes are prone to interfere with each other, causing pressure fluctuations and unstable flow rates inside the system, and even causing serious problems such as liquid reflux and pipe blockage. In addition, synchronous suction and drainage may also cause excessive bubbles and eddies inside the system. These phenomena not only reduce the suction efficiency, but may also damage the precision components in the system and shorten the service life of the equipment. In response to the above problems, the industry has made some attempts and improvements, such as adding buffer containers, optimizing pipeline layout, and adopting more advanced control algorithms. However, these solutions often have shortcomings such as high cost, complex structure, and difficult maintenance, making it difficult to be popularized in a wide range of market applications.

[0043] Therefore, the present application improves the relevant suction system, suction device and dental chair based on this.

[0044] See also Figure 1 , Figure 1 The schematic diagram of the framework structure of the suction system provided in the present embodiment is shown. The suction system of the present embodiment is applied to a suction device, and the suction device includes a liquid storage chamber for accommodating liquid, including a suction module 100, a liquid discharge module 200 and a control module 300; the suction module 100 is used to suck the liquid and gas to be sucked into the liquid storage chamber, the gas is discharged from the liquid storage chamber through the suction module, and the liquid remains in the liquid storage chamber; the liquid discharge module 200 is used to discharge the liquid from the liquid storage chamber; the control module 300 is used to start or shut down the suction module 100 and the liquid discharge module 200; wherein the control module 300 is configured to shut down the liquid discharge module 200 when the suction module 100 is started; and, shut down the suction module 100 when the liquid discharge module 200 is started.

[0045] It should be explained that the liquid storage chamber can be provided on the application device to accommodate the liquid sucked in. The suction module 100 is responsible for introducing the external liquid and gas to be sucked into the liquid storage chamber by a certain method (such as negative pressure suction, pumping, etc.). The liquid discharge module 200 is responsible for safely and thoroughly discharging the liquid in the liquid storage chamber. The control module 300 is used to coordinate the working status of the suction module 100 and the liquid discharge module 200. It intelligently starts or shuts down the suction module 100 and the liquid discharge module 200 by receiving external instructions or according to a preset program.

[0046] There is no restriction in the current suction system that the suction module 100 and the drainage module 200 cannot work at the same time, and it is easy to cause a fault when the suction module 100 and the drainage module 200 work at the same time. Even if this is controlled by the MCU, it is easy to have garbled characters, faults, electromagnetic interference and other problems, which lead to the failure of the suction module 100. However, the present application is configured to turn off the drainage module 200 when the suction module 100 is started, and to turn off the suction module 100 when the drainage module 200 is started, so that the suction module 100 and the drainage module 200 cannot be started at the same time, which is conducive to preventing the suction system from failing due to the simultaneous start of the suction module 100 and the drainage module 200. And relative to the solution controlled by the MCU, the technical solution of the present application is not easily affected by electromagnetic interference, has higher stability, and reduces costs.

[0047] In some embodiments of this application, please continue to refer to Figure 1 Also see Figure 2 , Figure 2 FIG. 1 shows a schematic diagram of the framework structure of the suction system provided in this embodiment. Figure 2 The control circuit in is the control module 300 in this embodiment. The suction system in this embodiment also includes a first access terminal 400, a second access terminal 500 and a first switch 600; the first access terminal 400 is used to access one of the live wire and the neutral wire of the external power supply; the second access terminal 500 is used to access the other of the live wire and the neutral wire of the external power supply, and the second access terminal 500 is also connected to the suction module 100 and the drainage module 200; the first switch 600 has a fixed end and a movable end, the fixed end is connected to the first access terminal 400, and the movable end can be switchably connected between the suction module 100 and the drainage module 200; the first switch 600 is configured to select one of the suction module 100 and the drainage module 200 under the control of the control module 300.

[0048] It should be explained that the first access terminal 400 is used to connect to the live wire of the external power supply. It is the positive part of the circuit and is responsible for transmitting electrical energy to the inside of the system. The second access terminal 500 corresponds to the first access terminal 400, and this port is used to connect to the neutral wire of the external power supply. The neutral wire serves as a return path in the circuit and forms a complete current loop together with the live wire. The first switch element 600 operates under the control of the control module 300. The control module 300 sends a signal to the first switch element 600, instructing it to connect the active end to the suction module 100 or the drainage module 200. When liquid needs to be sucked, the control module 300 connects the active end to the suction module 100; and when liquid needs to be drained, it is connected to the drainage module 200.

[0049] It is understandable that, in the startup phase, the external power supply supplies power to the system through the first access terminal 400 and the second access terminal 500. The first switch 600 is in a standby state, waiting for the instruction of the control module 300.

[0050] In the suction stage, when the control module 300 receives the suction instruction, it sends a signal to the first switch 600, instructing it to connect the active end to the suction module 100. At this time, the suction module 100 is connected to the live wire and the neutral wire, and the live wire supplies power to the suction module 100 through the first switch 600, so that it starts to work and sucks water vapor into the liquid storage chamber. During this process, the drainage module 200 remains closed because it does not receive power supply.

[0051] In the liquid discharge stage, when the liquid in the liquid storage chamber needs to be discharged, the control module 300 sends a liquid discharge instruction to the first switch 600. The first switch 600 then switches the active end from the suction module 100 to the liquid discharge module 200, supplies power to the liquid discharge module 200 and starts working. At this time, the suction module 100 stops working due to the loss of power supply.

[0052] like Figure 2 As shown, in some embodiments, the suction module 100 may be an air pump M1. In some embodiments, the drainage module 200 may be a drainage pump P1. In another embodiment, the drainage module 200 may be at least one of a drainage pump, a gravity drainage valve, and a positive pressure gas drainage unit. Specifically, the gravity drainage valve is a drainage valve that allows liquid to flow out under the action of gravity after the drainage valve is turned on. The positive pressure gas drainage unit is a liquid storage chamber that is inflated to allow the internal liquid to flow out.

[0053] In some embodiments, the liquid may be a suspension or a solid-liquid mixture. When applied to a dental chair, a negative pressure air pump may be used to provide negative pressure for the dental chair. The water vapor may be sucked into the liquid storage chamber by the negative pressure air pump, and the water vapor may be separated by gravity, and the separated liquid may be discharged into the liquid storage chamber.

[0054] In some embodiments, please refer to Figure 2 , AC 220V is connected to the negative pressure machine and divided into two groups. One group supplies power to the control circuit and liquid level detection after passing through the converter, and the other group is connected to the negative pressure pump (ie, air pump) and drainage pump.

[0055] In some embodiments, please refer to Figure 2 The first switch 600 is a double-connected single-control switch RP. The live wire of AC 220V is connected to the double-connected single-control switch RP, and the other two interfaces of the double-connected single-control switch are connected to the air pump and the drainage pump respectively.

[0056] In some embodiments of this application, please continue to refer to Figure 2 Also see Figure 3 , Figure 3FIG. 4 shows a circuit structure diagram of the liquid level detection module provided in this embodiment. Figure 2 The liquid level detection in the embodiment is the liquid level detection module in this embodiment. The suction system in this embodiment also includes a liquid level detection module, which is used to detect the liquid level in the liquid storage chamber and to send a detection signal according to the liquid level in the liquid storage chamber; the control module 300 is used to control the first switch 600 to select one of the suction module 100 and the discharge module 200 according to the detection signal.

[0057] It should be explained that the liquid level detection module is responsible for real-time monitoring of the liquid level in the liquid storage chamber. It generates corresponding electrical signals or digital signals according to the height change of the liquid surface in the liquid storage chamber, and these signals accurately reflect the filling state of the liquid storage chamber. When the liquid level detection module detects that the liquid level in the liquid storage chamber reaches a preset threshold (such as the lowest suction level, the highest discharge level, etc.), it will send a detection signal to the control module 300.

[0058] In some cases, if the liquid level is lower than the lowest suction level, the control module 300 will send an instruction to the first switch 600 to connect the active end to the suction module 100, thereby starting the suction process and introducing the external liquid into the liquid storage chamber. If the liquid level is higher than the highest drainage level, the control module 300 will send an instruction to the first switch 600 to switch the active end to the drainage module 200, start the drainage process, and discharge the liquid in the liquid storage chamber. In other cases (such as when the liquid level is within the normal range), the control module 300 will maintain the current state unchanged, and neither suction nor drainage will be started.

[0059] In some embodiments of this application, please continue to refer to Figure 3 The liquid level detection module is used to output a first sub-detection signal when the liquid level in the liquid storage chamber is higher than a first liquid level, and to output a second sub-detection signal when the liquid level in the liquid storage chamber is higher than a second liquid level and lower than the first liquid level, and to output a third sub-detection signal when the liquid level in the liquid storage chamber is lower than the second liquid level; the first liquid level is higher than the second liquid level; wherein the control module 300 is used to control the first switch element 600 to connect to the discharge module 200 or the suction module 100 according to the first sub-detection signal, the second sub-detection signal and one of the third sub-detection signal.

[0060] It should be explained that when the liquid level is higher than the set first liquid level, the module will output a first sub-detection signal, indicating that there is too much liquid in the liquid storage chamber and measures need to be taken to lower the liquid level. When the first sub-detection signal is received, the control module 300 will start or maintain the connection between the first switch 600 and the drainage module 200 to allow excess liquid in the liquid storage chamber to be discharged through the drainage module 200, thereby lowering the liquid level. When the liquid level is lower than the set second liquid level, the module will output a third sub-detection signal, indicating that there is less liquid in the liquid storage chamber. When the third sub-detection signal is received, the control module 300 will change the connection state of the first switch 600 so that it is connected to the suction module 100, which can provide negative pressure and suck liquid into the liquid storage chamber.

[0061] In some embodiments of this application, please continue to refer to Figure 3 The liquid level detection module of this embodiment includes a high liquid level probe and a low liquid level probe, which are used to jointly output a first sub-detection signal, a second sub-detection signal and a third sub-detection signal; wherein the high liquid level probe and the low liquid level probe are configured such that when the liquid level in the liquid storage chamber is higher than the first liquid level, the high liquid level probe and the low liquid level probe output a high-level signal to form a first sub-detection signal; when the liquid level in the liquid storage chamber is higher than the second liquid level and lower than the first liquid level, the high liquid level probe outputs a low-level signal and the low liquid level probe outputs a high-level signal to form a second sub-detection signal; when the liquid level in the liquid storage chamber is lower than the second liquid level, the high liquid level probe and the low liquid level probe output a low-level signal to form a third sub-detection signal.

[0062] For details, please continue to see Figure 3 , Figure 3 PROBE_H is the first sub-detection signal, and PROBE_L is the second sub-detection signal. The water level sensor adopts the probe form, a common probe, connected to the 1 / 3 mark line, and connected to the AC 14V voltage. A high liquid level probe is connected to the 2 mark line, and a low liquid level probe is connected to the 4 mark line. The common probe is inserted into the depth greater than or equal to the low liquid level probe. When the liquid level contacts the low liquid level probe, the 4 mark line is connected to the signal. When the liquid level contacts the high liquid level probe, the 2 mark line is also connected to the signal. The voltage signal is used here, which has strong stability. Even if the conductivity of the liquid is poor, it is easy to detect the voltage signal. In addition, filter units are connected to the 2 mark line and the 4 mark line, which can effectively filter clutter and have strong anti-interference ability. In addition, bidirectional transient suppression diodes are connected to the 2 mark line and the 4 mark line for anti-static and lightning protection. Here, when the water level touches the high liquid level probe, it is in the high liquid level state; when the water level does not touch the high liquid level probe but touches the low liquid level probe, it is in the intermediate liquid level state; when the water level does not touch the high liquid level probe nor the low liquid level probe, it is in the low liquid level state.

[0063] In some embodiments, a filter structure is provided at the output end for outputting the first sub-detection signal and the second sub-detection signal, and the filter structure includes a filter capacitor and a filter resistor which are arranged in parallel.

[0064] In some embodiments of this application, please refer to Figure 4 , Figure 4 The circuit structure diagram of the control module 300 provided in the present embodiment of the present application. The control module 300 of the present embodiment includes a first comparison unit and a second comparison unit; the first comparison unit is connected to the high liquid level probe, and outputs a first output signal after comparing the signal of the high liquid level probe with a first preset value, and the first output signal is used to adjust the first switch 600 to connect to the liquid discharge module 200; the second comparison unit is connected to the low liquid level probe, and outputs a second output signal after comparing the signal of the low liquid level probe with a second preset value, and the second output signal is used to adjust the first switch 600 to connect to the suction module 100.

[0065] In some embodiments of this application, please continue to refer to Figure 4 The control module 300 also includes a voltage following unit and a hysteresis comparison unit, the voltage following unit is used to output a fixed signal; the positive input end of the hysteresis comparison unit is used to access the first output signal and the second output signal; the negative input end of the hysteresis comparison unit is used to access the fixed signal; wherein the hysteresis comparison unit is used to output a first control signal according to the first output signal, the second output signal and the fixed signal, and the first control signal is used to control the first switch 600 to select one of the suction module 100 and the discharge module 200 for connection.

[0066] In some embodiments, the hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the drainage module when the liquid level in the liquid storage chamber drops from a first liquid level to a second liquid level; and / or, the hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the suction module when the liquid level in the liquid storage chamber rises from the second liquid level to the first liquid level.

[0067] Please continue to see the specific examples Figure 4 , the high liquid level signal is connected to the first comparison unit, and the low liquid level signal is connected to the second comparison unit. The first comparison unit recognizes that the voltage signal of the rectifier output is 7.5V, that is, the output voltage at the high liquid level, and the second comparison unit recognizes that the rectifier output voltage signal is 4.5V, that is, the intermediate liquid level voltage. The output end of the first comparison unit and the output end of the second comparison unit are both connected to the positive input end of the hysteresis comparison unit, and the upper and lower thresholds of the hysteresis comparison unit are 6.1V and 3.0V; the output end of the voltage follower unit is connected to the negative input end of the hysteresis comparison unit, and the voltage follower unit fixedly outputs a 6.1V signal.

[0068] During the process of the water level rising from a low liquid level, when it is at a low liquid level, both the first comparison unit and the second comparison unit output 0V, and finally the hysteresis comparison unit outputs a low level, and the double single-control switch RP (corresponding to the first switch element 600) is connected to the ventilation pump; when it is at an intermediate liquid level, the first comparison unit outputs 0V and the second comparison unit outputs 4.5V, both of which are not higher than 6.1V at the negative input end of the hysteresis comparison unit, so finally the hysteresis comparison unit outputs a low level, and the double single-control switch RP is connected to the ventilation pump; when it is at a high liquid level, the first comparison unit outputs 7.5V and the second comparison unit outputs 4.5V. At this time, the highest 7.5V is higher than 6.1V at the negative input end of the hysteresis comparison unit, and the hysteresis comparison unit outputs a high level. At this time, the voltage value is 10.3V, and the output voltage signal is finally used to control Figure 2 The double-connected single-control switch RP in the drain pump is connected to stop the air pump and then drain the water.

[0069] During drainage, when the water level drops from a high level, when it is at an intermediate level, the first comparison unit outputs 0V and the second comparison unit outputs 4.5V. At this time, since the high level of the hysteresis comparison unit has been activated and the positive input voltage is higher than the lower threshold of 3.0V, the hysteresis comparison unit continues to output a high level; when it is at a low level, both the first and second comparison units output 0V, and finally the hysteresis comparison unit outputs a low level double-connected single-control switch RP to connect the ventilation pump. Therefore, through the above circuit setting, the wind pump cannot be turned off at the intermediate level during the rising process of the water level, and the wind pump is turned off and the drainage pump is started only after reaching the high level; during the falling process of the water level, the wind pump cannot be started at the intermediate level, and the wind pump is started only after reaching the low level, and the drainage valve is closed. This control logic forms a coherence. Compared with the control method of MCU, the control logic is more coherent.

[0070] In some embodiments, the operational amplifiers included in the first comparison unit, the second comparison unit, the hysteresis comparison unit, and the voltage follower unit are all LM324DR.

[0071] In some embodiments, the first sub-output signal and the second sub-output signal may be voltage signals or current signals.

[0072] In some embodiments of this application, please refer to Figure 5 , Figure 5 A schematic diagram of the circuit structure of the suction system provided in this embodiment is shown. The suction system of this embodiment also includes a second switch component 700, which is arranged between the second access terminal 500 and the suction module 100 and is used to control the on-off between the second access terminal 500 and the suction module 100.

[0073] It should be explained that the second switch component 700 is used as a protection switch. The protection switch is turned on and off by the remote switch control, and is controlled indirectly, such as leading out the wiring harness, and a separate button is set to control the on and off of the protection switch RM. To start the negative pressure machine, you need to turn on the remote switch to make the protection switch conductive. The double-connected single-control switch RP is normally connected to the air pump and disconnects the drainage pump. At this time, the air pump can be started and the drainage pump is turned off. When the double-connected single-control switch RP is controlled to the drainage pump, the air pump is turned off and the water pump is turned on to complete the drainage. Since the double-connected single-control switch RP can only be connected to one of the ventilation pump and the drainage pump, the air pump and the drainage pump cannot be started at the same time, so there are very few failures. The MCU control method is prone to garbled characters, failures, etc., and is easily affected by electromagnetic interference, so the stability is not as good as our solution. Among them, the double-connected single-control switch RP and the protection switch RM (corresponding to the second switch component 700) are both controlled by electromagnetic relays.

[0074] In some embodiments, the neutral line is connected to the air pump and the drainage pump respectively, where the neutral line passes through the protection switch RM when connected to the air pump.

[0075] In some embodiments of this application, please continue to refer to Figure 5 The control module 300 of this embodiment further includes a remote input unit (corresponding to a remote switch input), which is used to receive an external control signal to control the on / off of the second switch element 700.

[0076] In some embodiments of this application, please refer to Figure 6 , Figure 6 The circuit structure diagram of the suction system provided by this embodiment is shown. In this embodiment, a signal processing unit is connected before the output end of the hysteresis comparison unit is connected to the double single control switch RP, and the signal processing of the hysteresis comparison unit is used as an input signal, so that more power is used to control the double single control switch RP. Similarly, when the remote switch is turned on, it also passes through the signal processing unit, so that more power is used to control the protection switch. MOS tube control is used here to ensure that higher current passes.

[0077] Please continue reading Figure 6 Also see Figure 7 , AC 220V is converted into AC 14V by the first converter, AC 14V is converted into DC 18V by the second converter, and DC 18V is converted into DC 12V by the third converter. Specifically, the first converter converts into DC 18V by rectification, and the second converter converts into DC 12V by voltage regulator.

[0078] Furthermore, in order to better implement the suction system in the above embodiment, the present application also provides a suction device based on the above suction system, and the suction device includes the above suction system.

[0079] Furthermore, in order to better implement the suction device in the above embodiment, on the basis of the above suction device, the present application also provides a dental chair, including the above suction device.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0082] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0083] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0084] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A suction system, characterized in that: The suction system is applied to a suction device, and the suction device includes a liquid storage chamber for containing liquid, and the suction system includes: A suction module, the suction module is used to suck the liquid and gas to be sucked into the liquid storage cavity, the gas is discharged from the liquid storage cavity through the suction module, and the liquid remains in the liquid storage cavity; A liquid discharge module, the liquid discharge module is used to discharge the liquid from the liquid storage chamber; A control module, the control module is used to start or shut down the suction module and the drainage module; wherein the control module is configured to shut down the drainage module when the suction module is started; and to shut down the suction module when the drainage module is started.

2. The suction system according to claim 1, characterized in that The suction system also includes: A first access terminal and a second access terminal, wherein the first access terminal is used to access one of the live wire and the neutral wire of the external power supply, and the second access terminal is used to access the other of the live wire and the neutral wire of the external power supply; the second access terminal is also connected to the suction module and the drainage module; a first switch element, the first switch element having a fixed end and a movable end, the fixed end being connected to the first access end, and the movable end being switchably connected between the suction module and the drainage module; Wherein, the first switch is configured to selectively connect between the suction module and the drainage module under the control of the control module.

3. The suction system according to claim 2, characterized in that The suction system also includes a liquid level detection module, which is used to detect the liquid level in the liquid storage chamber and to send a detection signal according to the liquid level in the liquid storage chamber; the control module is used to control the first switch to select a connection between the suction module and the drainage module according to the detection signal.

4. The suction system according to claim 3, characterized in that The liquid level detection module is used to output a first sub-detection signal when the liquid level in the liquid storage chamber is higher than a first liquid level, and is used to output a second sub-detection signal when the liquid level in the liquid storage chamber is higher than a second liquid level and lower than the first liquid level, and is used to output a third sub-detection signal when the liquid level in the liquid storage chamber is lower than the second liquid level; the first liquid level is higher than the second liquid level; The control module is used to control the first switch element to connect to the discharge module or the suction module according to one of the first sub-detection signal, the second sub-detection signal and the third sub-detection signal.

5. The suction system according to claim 4, characterized in that The liquid level detection module comprises a high liquid level probe and a low liquid level probe, wherein the high liquid level probe and the low liquid level probe are used to jointly output the first sub-detection signal, the second sub-detection signal and the third sub-detection signal; Wherein, the high liquid level probe and the low liquid level probe are configured such that when the liquid level in the liquid storage chamber is higher than the first liquid level, the high liquid level probe and the low liquid level probe output a high level signal to form the first sub-detection signal; when the liquid level in the liquid storage chamber is higher than the second liquid level and lower than the first liquid level, the high liquid level probe outputs a low level signal and the low liquid level probe outputs a high level signal to form the second sub-detection signal; when the liquid level in the liquid storage chamber is lower than the second liquid level, the high liquid level probe and the low liquid level probe output a low level signal to form the third sub-detection signal.

6. The suction system according to claim 5, characterized in that The control module comprises: a first comparison unit, connected to the high liquid level probe, and outputting a first output signal after comparing the signal of the high liquid level probe with a first preset value, wherein the first output signal is used to adjust the first switch to connect to the liquid discharge module; The second comparison unit is connected to the low liquid level probe, and outputs a second output signal after comparing the signal of the low liquid level probe with a second preset value, wherein the second output signal is used to adjust the first switch to connect to the suction module.

7. The suction system according to claim 6, characterized in that The control module also includes: A voltage follower unit, used for outputting a fixed signal; A hysteresis comparison unit, wherein the positive input terminal of the hysteresis comparison unit is used to access the first output signal and the second output signal; the negative input terminal of the hysteresis comparison unit is used to access the fixed signal; wherein the hysteresis comparison unit is used to output a first control signal according to the first output signal, the second output signal and the fixed signal, and the first control signal is used to control the first switch element to select one of the suction module and the discharge module for connection.

8. The suction system according to claim 7, characterized in that The hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the discharge module when the liquid level in the liquid storage chamber drops from the first liquid level to the second liquid level; and / or, the hysteresis comparison unit is configured to output a first control signal to control the first switch element to connect to the suction module when the liquid level in the liquid storage chamber rises from the second liquid level to the first liquid level.

9. A suction device, characterized in that: The suction device comprises the suction system according to any one of claims 1 to 8.

10. A dental chair, characterized in that: Comprising the suction device as claimed in claim 9.

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