Dental comprehensive treatment chair and water temperature control device thereof

Abstract

The utility model provides a dental comprehensive treatment chair and a motor-driven water temperature control device. The dental comprehensive treatment chair comprises a heating water tank, a water inlet pipeline connected with the heating water tank, a heater for heating the heating water tank, a water outlet pipeline connected with the heating water tank and a water outlet electromagnetic valve arranged on the water outlet pipeline or the water inlet pipeline. The water temperature control device comprises a first temperature sensor arranged in the heating water tank, a second temperature sensor arranged on the water inlet pipeline, a temperature controller and a switching circuit, and the temperature controller outputs a heating control signal according to detection signals output by the first temperature sensor and the second temperature sensor. The switch circuit is switched on and switched off according to the heating control signal, so that the heater heats or stops heating, the mouth wash in the tooth glass can be accurately controlled to meet the required temperature, and the comfort of the mouth patient in the mouth washing process is improved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular, to a dental comprehensive treatment chair and its water temperature control device. Background Art

[0002] The dental comprehensive treatment chair, abbreviated as the dental chair, is a comprehensive treatment table for dentists to conduct oral examinations, treatments, and surgeries on patients. During the examination or treatment of patients on the dental chair, they need to rinse their mouths with water. To improve the comfort of patients when rinsing their mouths, a heating water tank is usually configured in the dental chair to provide hot water at an appropriate temperature for patients to rinse their mouths.

[0003] The control method for some dental chairs on the market to provide mouthwash at an appropriate temperature for patients is usually as follows: A temperature sensor is set in the heating water tank. Based on the hot water temperature detection signal output by the temperature sensor, the heater is controlled to heat the water temperature in the heating water tank to the set value. When mouthwash is needed, the water outlet solenoid valve on the water outlet pipeline is opened. Cold water enters from the inlet of the heating water tank, and at the same time, hot water at the set temperature flows out from the outlet. When all the hot water in the water heater has flowed out, at this time, the cold water at the inlet flows out from the outlet, and the cold and hot water in the mouthwash cup are mixed into the required temperature for patients to use. However, this water temperature control method has low control accuracy for the water temperature in the mouthwash cup and is not conducive to improving the comfort of patients when rinsing their mouths. Utility Model Content

[0004] To solve the existing technical problems, this application provides a dental comprehensive treatment chair and its water temperature control device with high water temperature control accuracy.

[0005] According to the first aspect of the embodiments of this application, a water temperature control device for a dental comprehensive treatment chair is provided. The dental comprehensive treatment chair includes a heating water tank, a water inlet pipeline connected to the water inlet of the heating water tank, a heater for heating the heating water tank, a water outlet pipeline connected to the water outlet of the heating water tank, and a water outlet solenoid valve provided on the water outlet pipeline or the water inlet pipeline. When the water outlet solenoid valve is opened, the water in the water inlet pipeline flows to the heating water tank, and the water in the heating water tank flows into the mouthwash cup through the water outlet pipeline. The water temperature control device includes:

[0006] A first temperature sensor, provided in the heating water tank, for detecting the temperature of the water in the heating water tank to obtain a first temperature detection signal;

[0007] A second temperature sensor, provided on the water inlet pipeline, for detecting the temperature of the water in the water inlet pipeline to obtain a second temperature detection signal;

[0008] A temperature controller, which is respectively connected to the first temperature sensor and the second temperature sensor to receive the first temperature detection signal and the second temperature detection signal, and outputs a heating control signal;

[0009] A switch circuit, the current input end of the switch circuit is connected to the power supply of the heater, the current output end of the switch circuit is connected to the heater, and the switch control end of the switch circuit is connected to the temperature controller for receiving the heating control signal, and the power supply supplies power to the heater through the switch circuit in the on state.

[0010] In some embodiments, it further includes a third temperature sensor connected to the temperature controller;

[0011] The third temperature sensor is used to detect the temperature of the environment where the dental chair is located, obtain a third temperature detection signal, and send the third temperature detection signal to the temperature controller.

[0012] In some embodiments, the switch circuit is composed of a thyristor and a thyristor drive circuit. The first end of the thyristor is connected to the power supply, the second end of the thyristor is connected to the heater, and the third end of the thyristor is connected to the first end of the thyristor drive circuit; the second end of the thyristor drive circuit is connected to the first end of the thyristor, the third end of the thyristor drive circuit is connected to the temperature controller, and the fourth end of the thyristor drive circuit is grounded; or,

[0013] The switch circuit is composed of a relay and a relay drive circuit. The power input end of the relay is connected to the power supply, the normally closed output end of the relay is connected to the heater, the first end of the coil of the relay is connected to the power supply end of the temperature controller, and the second end of the coil of the relay is connected to the relay drive circuit; the relay drive circuit includes a first resistor and a triode. The two ends of the first resistor are respectively connected to the control output end of the temperature controller and the control end of the triode. The collector of the triode is connected to the second end of the coil, and the emitter of the triode is grounded.

[0014] In some embodiments, the thyristor drive circuit includes an optocoupler and a second resistor;

[0015] The first end of the optocoupler is connected to the third end of the thyristor, the second end of the optocoupler is connected to the first end of the thyristor, the third end of the optocoupler is connected to the first end of the second resistor, the second end of the second resistor is connected to the temperature controller, and the fourth end of the optocoupler is grounded.

[0016] In some embodiments, the thyristor drive circuit further includes a third resistor;

[0017] A first end of the third resistor is connected to a first end of the optocoupler, and a second end of the third resistor is connected to a third end of the thyristor.

[0018] In some embodiments, the dental unit chair further includes a pressure reducing valve disposed on the water inlet pipeline;

[0019] The second temperature sensor is disposed on a section of the water inlet pipeline between the pressure reducing valve and the heating water tank.

[0020] In some embodiments, the temperature controller includes a first MCU chip and a first power supply circuit connected to the first MCU chip;

[0021] The first power supply circuit is connected to the power supply, and is configured to convert the power supply into a first supply voltage to supply power to the first MCU chip.

[0022] In some embodiments, the first power supply circuit includes a rectifier circuit connected to the power supply, an input filter circuit connected to the rectifier circuit, a buck circuit connected to the input filter circuit, and an output filter circuit connected to the buck circuit;

[0023] The rectifier circuit is configured to rectify the AC voltage output by the power supply to obtain a first DC voltage;

[0024] The input filter circuit is configured to filter the first DC voltage;

[0025] The buck circuit is configured to convert the first DC voltage into a second DC voltage;

[0026] The output filter circuit is configured to filter the second DC voltage to output the first supply voltage to a power supply terminal of the first MCU chip.

[0027] In some embodiments, the water temperature control device further includes a main controller connected to the water outlet solenoid valve;

[0028] The main controller includes a second MCU chip and a second power supply circuit connected to the second MCU chip;

[0029] The second power supply circuit is connected to the power supply, and is configured to convert the power supply into a second supply voltage to supply power to the second MCU chip, and an output end of the second MCU chip is connected to the water outlet solenoid valve.

[0030] According to a second aspect of the embodiments of the present application, a dental comprehensive treatment chair is provided, including the water temperature control device described in any one of the above, a heating water tank, a water inlet pipeline connected to the water inlet of the heating water tank, a heater for heating the heating water tank, a water outlet pipeline connected to the water outlet of the heating water tank, and a water outlet solenoid valve provided on the water outlet pipeline or the water inlet pipeline. When the water outlet solenoid valve is opened, the water in the water inlet pipeline flows into the heating water tank, and the water in the heating water tank flows into the rinsing cup through the water outlet pipeline.

[0031] As can be seen from the above, in the water temperature control device provided by the embodiments of the present application, in addition to setting a first temperature sensor in the heating water tank, a second temperature sensor is also set on the water inlet pipeline. The temperature controller determines the heating control signal according to the first temperature detection signal and the second temperature detection signal, and controls the heater to perform heating work according to the heating control signal, so as to more accurately control the temperature of the rinsing water input into the rinsing cup to meet the required temperature, which is beneficial to improving the comfort of oral patients when rinsing. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the water temperature control device of the dental comprehensive treatment chair provided according to some embodiments of the present application;

[0033] Figure 2 It is a schematic structural diagram of the water temperature control device of the dental comprehensive treatment chair provided according to some other embodiments of the present application;

[0034] Figure 3 It is a schematic structural diagram of the switch circuit provided according to some embodiments of the present application;

[0035] Figure 4 It is a schematic structural diagram of the switch circuit provided according to some other embodiments of the present application;

[0036] Figure 5 It is a schematic structural diagram of the water temperature control device of the dental comprehensive treatment chair provided according to some embodiments of the present application;

[0037] Figure 6 It is a schematic structural diagram of a specific implementation of the first DC-DC circuit in the water temperature control device provided according to some embodiments of the present application. Detailed Embodiments

[0038] The technical solution of the present application will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the description of this application herein are for the purpose of describing specific embodiments only and are not intended to limit the implementation of this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. In the description of this application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0040] In the description of this application, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, they can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Please refer to Figure 1 As shown, it is a schematic structural diagram of the water temperature control device of a dental unit chair provided according to some embodiments of this application. In some embodiments, the dental unit chair includes a heating water tank 1, a water inlet pipe 2 connected to the water inlet of the heating water tank 1, a heater 3 for heating the heating water tank 1, a water outlet pipe 4 connected to the water outlet of the heating water tank 1, and a water outlet solenoid valve 5 provided on the water outlet pipe 4. When the water outlet solenoid valve 5 is opened, the water in the water inlet pipe 2 flows into the heating water tank, and the water in the heating water tank 1 flows into the rinsing cup 11 through the water outlet pipe 4. That is, when the water outlet solenoid valve is opened, the cold water in the water inlet pipe 2 will enter the heating water tank 1 to discharge the hot water in the heating water tank 1 from the water outlet of the heating water tank 1 and enter the water outlet pipe 4, and then be injected into the rinsing cup 11 through the water outlet pipe 4. After the hot water in the heating water tank 1 is drained, the cold water entering the heating water tank 1 will continue to be injected into the rinsing cup 11 through the water outlet pipe 4, so that each time water is injected into the rinsing cup 11, a certain amount of hot water is injected first, and then a certain amount of cold water is injected. The injected hot water and cold water are mixed in a certain proportion to obtain the rinsing water at the required temperature. It should be noted that, in this embodiment, the water outlet solenoid valve 5 is provided on the water outlet pipe 4. In some other embodiments, as Figure 2 shown, the water outlet solenoid valve 5 can also be provided on the water inlet pipe 2, and its function is to drive water to enter the heating water tank 1 from the water inlet pipe 2 and then flow out of the heating water tank 1 to the water outlet pipe 4 to inject water into the rinsing cup 11 from the water outlet pipe 4.

[0042] In some embodiments of this application, the dental unit chair further includes a chair body ( Figure 1(not shown in the figure) and a rinsing table 10 provided on one side of the dental chair. The rinsing table 10 has a cup holder for placing a rinsing cup 11. When receiving rinsing water, the rinsing cup 11 is placed on the cup holder of the rinsing table 10. In some embodiments, the water temperature control device includes a first temperature sensor 6, a second temperature sensor 7, a temperature controller 8, and a switch circuit 9. The first temperature sensor 6 is disposed in the heating water tank 1 for detecting the temperature of the water in the heating water tank 1 to obtain a first temperature detection signal. The second temperature sensor 7 is disposed on the water inlet pipeline 2 for detecting the temperature of the water in the water inlet pipeline 2 to obtain a second temperature detection signal. The temperature controller 8 is respectively connected to the first temperature sensor 6 and the second temperature sensor 7 to receive the first temperature detection signal and the second temperature detection signal, and output a heating control signal. Specifically, the temperature controller 8 is a single-chip microcomputer, which performs a logical operation on the first temperature detection signal and the second temperature detection signal to obtain a heating control signal. The current input end of the switch circuit 9 is connected to the power supply of the heater 3, the current output end is connected to the heater 3, and the switch control end is connected to the temperature controller 8 for receiving the heating control signal. Wherein, the power supply supplies power to the heater 3 through the switch circuit 9 in a conducting state. That is, when the switch circuit 9 is in a conducting state, the current input end and the current output end of the switch circuit 9 are conducted, the power supply circuit of the heater 3 is in a conducting state, and the power supply supplies power to the heater 3 through the conducting switch circuit 9, so that the heater 3 performs a heating operation to heat the water in the heating water tank 1. When the switch circuit 9 is in an off state, the current input end and the current output end of the switch circuit 9 are disconnected, the power supply circuit of the heater 3 is in an off state, and the power supply stops supplying power to the heater 3, so that the heater 3 stops the heating operation to stop heating the water in the heating water tank 1. It should be noted that although the temperature controller 8 and the switch circuit 9 are separately drawn as two different functional modules in Figure 1 it does not limit that the temperature controller 8 and the switch circuit 9 are separately disposed in different housings or different circuit boards. According to the water temperature control device provided by the present application, the temperature controller 8 and the switch circuit 9 can be disposed on the same circuit board, or can be disposed on different circuit boards. The temperature controller 8 and the switch circuit 9 can be disposed in the same housing, or can be disposed in different housings. That is, the specific implementation manners of the temperature controller 8 and the switch circuit 9 are not limited in the present application.

[0043] Before the water outlet solenoid valve 5 is opened each time, the heating water tank 1 is filled with hot water. The water inlet flow rate and the water outlet flow rate of the heating water tank 1 are the same, and the opening time of the water outlet solenoid valve 5 can be determined according to the volume of the mouthwash to be injected into the mouthwash cup 11 and the water outlet speed of the water outlet pipeline 4. If the volume of the mouthwash to be injected into the mouthwash cup 11 each time is V1 and the capacity of the heating water tank 1 is V2, then during each opening of the water outlet solenoid valve 5, the volume of the hot water injected into the mouthwash cup 11 is V2, and the volume of the cold water V3 to be injected into the mouthwash cup 11 is V3 = V1 - V2. If the temperature of the mouthwash in the mouthwash cup 11 needs to be T1, the temperature of the hot water in the heating water tank 1 is T2, and the temperature of the cold water in the water inlet pipeline 2 is T3, then it is necessary to satisfy: T1 * V1 = V2 * T2 + T3 * V3.

[0044] In the prior art, the cold water temperature T3 in the water inlet pipeline 2 is considered a fixed value, and the temperature controller 8 determines the heating control signal for controlling the heater 3 to heat only according to the temperature signal collected by the temperature sensor provided in the heating water tank 1. However, in actual applications, the temperature of the cold water in the water inlet pipeline 2 will change in different application environments. Therefore, this existing water temperature control method makes the mouthwash in the mouthwash cup 11 unable to accurately meet the required temperature. In the water temperature control device provided according to some embodiments of the present application, in addition to setting the first temperature sensor 6 in the heating water tank 1, a second temperature sensor 7 is also provided on the water inlet pipeline 2. The temperature controller 8 determines the heating control signal according to the first temperature detection signal and the second temperature detection signal, and controls the heater 3 to perform the heating operation according to the heating control signal, so as to more accurately control the temperature of the mouthwash input into the mouthwash cup 11 to meet the required temperature. Obviously, the water temperature control accuracy of the water temperature control device provided according to some embodiments of the present application is relatively high, which is beneficial to improving the comfort of oral patients when gargling.

[0045] In some embodiments, the above power supply is an AC-AC switching power supply, which is used to convert the AC mains into an AC supply voltage Vac for output.

[0046] In some embodiments of the present application, based on the relationship among the temperature T1 required for the mouthwash in the mouthwash cup 11, the temperature T2 required for the hot water in the heating water tank, and the temperature T3 of the cold water in the water inlet pipe 2, it can be obtained that: T2 = (T1 * V1 - T3 * V3) / V2. Since V1, V2, and V3 are fixed coefficients and T1 is a set temperature, in order to accurately control the temperature of the mouthwash in the mouthwash cup 11 to be T1, the relationship that needs to be satisfied between the temperature T2 of the hot water in the heating water tank 1 and the temperature T3 of the cold water in the water inlet pipe 2 is: T2 = a - b * T3, where a = T1 * V1 / V2 and b = V3 / V2, and both are fixed coefficients. T3 is the temperature detected by the second sensor, that is, the second temperature detection signal. After the temperature controller 8 obtains the second temperature detection signal output by the second temperature sensor 7, it can determine the temperature T2 required for heating the hot water in the heating water tank 1, then take the difference between the determined temperature T2 and the second temperature detection signal (the detected temperature of the hot water in the heating water tank 1) output by the first temperature sensor 6, and can determine the corresponding heating control signal according to this difference, so as to finally make the temperature of the hot water in the heating water tank 1 reach T2, so as to accurately make the temperature of the mouthwash in the mouthwash cup 11 reach T3. From the above temperature conversion relationship, it can be known that the temperature controller 8 can be implemented by various arithmetic units and error comparators, and various arithmetic units include adders, subtracters, and / or multipliers.

[0047] In some embodiments, please continue to refer to Figure 1 As shown, the water temperature control device further includes a third temperature sensor 12 connected to the temperature controller. The third temperature sensor 12 is used to detect the temperature of the environment where the dental chair is located, obtain a third temperature detection signal, and send the third temperature detection signal to the temperature controller 8. The temperature controller 8 adjusts the above temperature T3 according to the magnitude of the third temperature detection signal, that is, adjusts the temperature value required for the mouthwash in the mouthwash cup 11 according to the ambient temperature, so that the mouthwash in the mouthwash cup 11 can meet the comfort of the oral patient during gargling at different ambient temperatures. Specifically, when the ambient temperature is relatively high, the above T3 can be lowered, and vice versa. For example, in summer, T3 is lowered, and in winter, T3 is raised.

[0048] Please refer to Figure 3 As shown, it is a schematic diagram of the switch circuit structure provided by some embodiments of the present application. In this embodiment, Figure 1The switch circuit 9 therein includes a thyristor Q and a thyristor drive circuit 91. The first end of the thyristor Q is connected to the power supply, the second end of the thyristor Q is connected to the heater 3, and the third end of the thyristor Q is connected to the first end of the thyristor drive circuit 91. The second end of the thyristor drive circuit 91 is connected to the first end of the thyristor Q, the third end of the thyristor drive circuit 91 is connected to the temperature controller 8, and the fourth end of the thyristor drive circuit 91 is grounded.

[0049] Specifically, the first end of the thyristor Q is the anode, the second end is the cathode, and the third end is the control electrode. By controlling the on and off time ratio of the thyristor Q to control the heating power of the heater 3, the temperature of the hot water in the heating water tank 1 can be adjusted more precisely, so as to finally achieve that the temperature of the mouthwash in the mouthwash cup 11 reaches the required temperature.

[0050] Please continue to refer to Figure 3 As shown, in some embodiments, the thyristor drive circuit 91 includes an optocoupler UK and a second resistor R1. Among them, the second resistor R1 is the input current limiting resistor of the optocoupler UK. Specifically, the first end of the optocoupler UK is connected to the third end of the thyristor Q, the second end of the optocoupler UK is connected to the first end of the thyristor Q, the third end of the optocoupler UK is connected to the first end of the second resistor R1, the second end of the second resistor R1 is connected to the temperature controller 8, the fourth end of the optocoupler UK is grounded, and the first supply voltage of the temperature controller 8 is Vdc2.

[0051] Please continue to refer to Figure 3 As shown, in some embodiments, the thyristor drive circuit 91 further includes a third resistor R2. The setting of the third resistor R2 can prevent the thyristor Q from being mis-triggered, so as to avoid affecting the temperature of the mouthwash in the mouthwash cup 11. Specifically, the first end of the third resistor R2 is connected to the first end of the optocoupler UK, and the second end of the third resistor R2 is connected to the third end of the thyristor Q.

[0052] Please refer to Figure 4As shown, it is a schematic diagram of the switch circuit structure provided according to some other embodiments of the present application. In some other embodiments, the switch circuit 9 is composed of a relay K and a relay driving circuit 92. The power input terminal of the relay K is connected to the power supply, the normally closed output terminal of the relay K is connected to the heater 3, the first end of the coil of the relay K is connected to the power supply terminal of the temperature controller 8, and the second end of the coil of the relay K is connected to the relay driving circuit 92. Among them, the relay driving circuit 92 includes a first resistor R0 and a triode BG. Two ends of the first resistor R0 are respectively connected to the control output terminal of the temperature controller 8 and the control terminal of the triode BG. The collector of the triode BG is connected to the second end of the coil, and the emitter of the triode BG is grounded. Based on the relay to realize the heating control of the heater 3, when the water temperature in the heating water tank 1 reaches a certain value, the heating can be automatically turned off, which is beneficial to improving the safety performance and service life of the dental chair.

[0053] Please refer to Figure 5 As shown, it is a schematic diagram of the water temperature control device structure of the dental chair provided according to some embodiments of the present application. In some embodiments, the dental chair further includes a pressure reducing valve 14 provided on the water inlet pipeline. Specifically, the second temperature sensor 7 is provided on a section of the water inlet pipeline 2 between the pressure reducing valve 14 and the heating water tank 1. By setting the pressure reducing valve 14, it is beneficial to make the cold water in the water inlet pipeline 2 enter the heating water tank 1 when the water outlet valve 5 is opened.

[0054] Specifically, please further refer to Figure 5 As shown, in some embodiments, the temperature controller 8 is connected to the power supply to receive the voltage output by the power supply for power supply. Specifically, in some embodiments, the temperature controller 8 includes a first MCU chip and a first power supply circuit connected to the first MCU chip. The first power supply circuit is connected to the power supply and is used to convert the power supply into a first power supply voltage Vdc2 to supply power to the first MCU chip. Specifically, the first MCU chip can be a chip with the model of Atmega8.

[0055] Please continue to refer to Figure 5 As shown, in some embodiments, the water temperature control device further includes a main controller 13 connected to the water outlet solenoid valve. The main controller 13 is used to set the duration of each opening of the water outlet solenoid valve 5 to control the opening and closing states of the water outlet solenoid valve 5. The main controller 13 is also connected to the power supply to receive the voltage output by the power supply for power supply.

[0056] Specifically, in some embodiments, the main controller 13 includes a second MCU chip and a second power supply circuit connected to the second MCU chip. The second power supply circuit is connected to the power supply and is configured to convert the power supply into a second supply voltage to power the second MCU chip. The output terminal of the second MCU chip is connected to the water outlet solenoid valve 5. Specifically, the second MCU chip may be a chip of model Atmega64. The second power supply circuit and the first power supply circuit may have the same configuration.

[0057] Please refer to Figure 6 As shown, it is a schematic structural diagram of a first power supply circuit provided according to some embodiments of the present application. In some embodiments, the first power supply circuit 82 includes a rectification circuit 821 connected to the power supply, an input filter circuit 822 connected to the rectification circuit 821, a buck circuit 823 connected to the input filter circuit 822, and an output filter circuit 824 connected to the buck circuit 823. The rectification circuit 821 is configured to rectify the AC voltage Vac output by the power supply to obtain a first DC voltage Vdc1. The input filter circuit is configured to filter the first DC voltage Vdc1. The buck circuit 823 is configured to convert the first DC voltage Vdc1 into a second DC voltage. The output filter circuit 824 is configured to filter the second DC voltage to output the first supply voltage to the power supply terminal of the first MCU chip. That is, the first supply voltage is the second DC voltage.

[0058] Specifically, the rectification circuit may be a half-wave rectification circuit or a full-wave rectification circuit. The input filter circuit includes capacitors C1 and C2 connected in parallel, and the output filter circuit includes capacitors C3 and C4 connected in parallel. Among them, capacitors C2 and C4 are electrolytic capacitors to maintain the stability of the input voltage and output voltage of the buck circuit 823.

[0059] In some embodiments, the present application further provides a dental comprehensive treatment chair, which includes a water temperature control device provided according to any one of the embodiments of the present application, a heating water tank 1, a water inlet pipe 2 connected to the water inlet of the heating water tank 1, a heater 3 for heating the heating water tank 1, a water outlet pipe 4 connected to the water outlet of the heating water tank 1, and a water outlet solenoid valve 5 provided on the water outlet pipe 4 or the water inlet pipe 2. When the water outlet solenoid valve 5 is open, the water in the water inlet pipe 2 flows into the heating water tank 1, and the water in the heating water tank 1 flows into the rinsing cup 11 via the water outlet pipe 4. The dental comprehensive treatment chair provided by the embodiments of the present application achieves the same technical effects as the water temperature control device provided by some embodiments of the present application, and will not be elaborated herein.

[0060] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A water temperature control device for a dental chair, characterized in that, The dental comprehensive treatment chair includes a heating water tank, a water inlet pipe connected to the water inlet of the heating water tank, a heater for heating the heating water tank, a water outlet pipe connected to the water outlet of the heating water tank, and a water outlet solenoid valve provided on the water outlet pipe or the water inlet pipe. When the water outlet solenoid valve is opened, the water in the water inlet pipe flows into the heating water tank, and the water in the heating water tank flows into the rinsing cup via the water outlet pipe. The water temperature control device includes: A first temperature sensor, provided in the heating water tank, for detecting the temperature of the water in the heating water tank to obtain a first temperature detection signal; A second temperature sensor, provided on the water inlet pipe, for detecting the temperature of the water in the water inlet pipe to obtain a second temperature detection signal; A temperature controller, respectively connected to the first temperature sensor and the second temperature sensor to receive the first temperature detection signal and the second temperature detection signal, and output a heating control signal; A switching circuit, the current input end of the switching circuit is connected to the power supply of the heater, the current output end of the switching circuit is connected to the heater, and the switch control end of the switching circuit is connected to the temperature controller for receiving the heating control signal, and the power supply supplies power to the heater through the switching circuit in a conducting state.

2. The water temperature control device according to claim 1, characterized in that, It further includes a third temperature sensor connected to the temperature controller; The third temperature sensor is used for detecting the temperature of the environment where the dental comprehensive treatment chair is located to obtain a third temperature detection signal, and sending the third temperature detection signal to the temperature controller.

3. The water temperature control device according to claim 1, characterized in that The switching circuit is composed of a thyristor and a thyristor drive circuit. The first end of the thyristor is connected to the power supply, the second end of the thyristor is connected to the heater, and the third end of the thyristor is connected to the first end of the thyristor drive circuit; the second end of the thyristor drive circuit is connected to the first end of the thyristor, the third end of the thyristor drive circuit is connected to the temperature controller, and the fourth end of the thyristor drive circuit is grounded; or, The switching circuit is composed of a relay and a relay drive circuit. The power input end of the relay is connected to the power supply, the normally closed output end of the relay is connected to the heater, the first end of the coil of the relay is connected to the power supply end of the temperature controller, and the second end of the coil of the relay is connected to the relay drive circuit; the relay drive circuit includes a first resistor and a triode. The two ends of the first resistor are respectively connected to the control output end of the temperature controller and the control end of the triode. The collector of the triode is connected to the second end of the coil, and the emitter of the triode is grounded.

4. The water temperature control device according to claim 3, characterized in that, The thyristor drive circuit includes an optocoupler and a second resistor; The first end of the optocoupler is connected to the third end of the thyristor, the second end of the optocoupler is connected to the first end of the thyristor, the third end of the optocoupler is connected to the first end of the second resistor, the second end of the second resistor is connected to the temperature controller, and the fourth end of the optocoupler is grounded.

5. The water temperature control device according to claim 4, wherein The thyristor drive circuit further includes a third resistor; The first end of the third resistor is connected to the first end of the optocoupler, and the second end of the third resistor is connected to the third end of the thyristor.

6. The water temperature control device according to claim 1, wherein, The dental unit also includes a pressure reducing valve provided on the water inlet pipeline; The second temperature sensor is provided on a section of the water inlet pipeline between the pressure reducing valve and the heating water tank.

7. The water temperature control device according to claim 1, wherein The temperature controller includes a first MCU chip and a first power supply circuit connected to the first MCU chip; The first power supply circuit is connected to the power supply, and is used to convert the power supply into a first power supply voltage to supply power to the first MCU chip.

8. The water temperature control device according to claim 7, wherein The first power supply circuit includes a rectifier circuit connected to the power supply, an input filter circuit connected to the rectifier circuit, a buck circuit connected to the input filter circuit, and an output filter circuit connected to the buck circuit; The rectifier circuit is used to rectify the AC voltage output by the power supply to obtain a first DC voltage; The input filter circuit is used to filter the first DC voltage; The buck circuit is used to convert the first DC voltage into a second DC voltage; The output filter circuit is used to filter the second DC voltage to output the first power supply voltage to the power supply terminal of the first MCU chip.

9. The water temperature control device according to claim 1, characterized in that, It further includes a main controller connected to the water outlet solenoid valve; The main controller includes a second MCU chip and a second power supply circuit connected to the second MCU chip; The second power supply circuit is connected to the power supply, and is used to convert the power supply into a second power supply voltage to supply power to the second MCU chip, and the output end of the second MCU chip is connected to the water outlet solenoid valve.

10. A dental comprehensive treatment chair, characterized in that, It includes a water temperature control device according to any one of claims 1 to 9, a heating water tank, a water inlet pipeline connected to the water inlet of the heating water tank, a heater for heating the heating water tank, a water outlet pipeline connected to the water outlet of the heating water tank, and a water outlet solenoid valve provided on the water outlet pipeline or the water inlet pipeline. When the water outlet solenoid valve is opened, the water in the water inlet pipeline flows into the heating water tank, and the water in the heating water tank flows into the rinsing cup through the water outlet pipeline.

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