Intelligent constant-temperature shower head

Abstract

The intelligent constant-temperature shower head comprises a cold water pool, a hot water pool and a cold and hot mixed water tank, the cold and hot mixed water tank is connected with a shower head nozzle, the cold water pool supplies water to the cold and hot mixed water tank through a first water pump, and the hot water pool supplies water to the cold and hot mixed water tank through a second water pump; the hot water tank is provided with a heating rod, a contact of a relay is connected in series in a power supply circuit of the electric heating rod, the relay is controlled by a constant-temperature control circuit, the constant-temperature control circuit comprises a first PTC thermistor, the first PTC thermistor is used for sensing the temperature of water in the hot water tank, and the first PTC thermistor is connected in series in a first voltage division circuit; the output of the first voltage division circuit is used for controlling the on-off of the relay; the cold and hot mixed water tank is provided with a temperature measuring module, the temperature measuring module is used for detecting the temperature of water in the cold and hot mixed water tank, and the temperature measuring module is electrically connected with the singlechip; the first water pump and the second water pump are both controlled by the single-chip microcomputer. Constant temperature control of the shower head can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic control, in particular to an intelligent constant temperature shower head. Background Art

[0002] A thermostatic showerhead is another name for a thermostatic shower faucet, also known as a thermostatic shower head or thermostatic shower faucet. Mixing faucets are commonly found in four areas of the home: the kitchen, sink, bathtub, and shower room. Because the mixed warm water used in showers is sprayed directly onto the body through the showerhead, maintaining a constant temperature greatly improves showering safety and comfort. A thermostatic mixing faucet with a shower head can achieve this goal.

[0003] Existing constant temperature showers use the constant temperature regulating valve core of the faucet to automatically balance the water pressure of cold water and hot water in a very short time to maintain a stable water temperature, without the need for manual adjustment.

[0004] Currently, there is a lack of a device that can achieve a constant shower water temperature by intelligently controlling the water temperature on the hot water supply side.

[0005] Thermistor ceramics are semiconductor materials that are sensitive to temperature changes. Due to their high sensitivity, simple structure, ease of use, and low price, they are widely used in many high-tech fields, including modern microelectronics, optoelectronics, and communications. They have garnered significant attention in defense, science and technology, industry, agriculture, and, in particular, materials science.

[0006] PTC thermistor ceramics are widely used in the electronics, healthcare, home appliances, machinery, energy, fermentation, automotive, and petrochemical industries for applications such as constant-temperature heaters, current limiting protection, and temperature detection. Utilizing the material's resistance-temperature, current-voltage, and current-time characteristics, it can be manufactured into self-regulating heating elements, overcurrent protection components, and overheat protection components.

[0007] PTC thermistors are mostly used in self-regulating heating elements, overcurrent protection, and overheat protection components. Patents related to PTC temperature measurement only use the resistance-temperature characteristics of PTC thermistors to provide simple temperature indication. Utility Model Content

[0008] In order to remedy the above-mentioned deficiencies, the present invention aims to provide an intelligent constant temperature shower head, which can achieve a constant shower water temperature through intelligent control of the water supply end.

[0009] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0010] An intelligent constant temperature shower head includes a cold water pool, a hot water pool, and a hot and cold mixing water tank. The hot and cold mixing water tank is connected to the shower head. The cold water pool supplies water to the hot and cold mixing water tank through a first water pump, and the hot water pool supplies water to the hot and cold mixing water tank through a second water pump.

[0011] The hot water pool is provided with a heating rod, and a contact of a relay is connected in series in a power supply circuit of the electric heating rod. The relay is controlled by a constant temperature control circuit. The constant temperature control circuit includes a first PTC thermistor. The first PTC thermistor is used to sense the temperature of the water in the hot water pool. The first PTC thermistor is connected in series in a first voltage divider circuit. The output of the first voltage divider circuit is used to control the on and off of the relay.

[0012] The hot and cold mixed water tank is provided with a temperature measuring module, which is used to detect the water temperature in the hot and cold mixed water tank, and the temperature measuring module is connected to the single chip microcomputer;

[0013] The first water pump and the second water pump are both controlled by a single chip microcomputer.

[0014] Preferably, the output of the first voltage divider circuit is connected to one input end of a first comparison circuit, the other input end of the first comparison circuit is connected to a reference voltage, and the output end of the first comparison circuit is used to control the on and off of the relay.

[0015] Furthermore, the input of the first voltage divider circuit is connected to the input end of the first PTC thermistor, and the output end of the first voltage divider circuit is connected to the first comparison circuit;

[0016] The cold water pool is provided with a temperature detection circuit, which includes a second PTC thermistor. The second PTC thermistor is used to sense the water temperature in the cold water pool. The second PTC thermistor is connected in series in a second voltage divider circuit. The output of the second voltage divider circuit is connected to the input end of an A / D converter, and the output end of the A / D converter is connected to a single-chip microcomputer.

[0017] Preferably, the first PTC thermistor and the second PTC thermistor are both ceramic resistors.

[0018] Furthermore, the hot water pool is provided with a water level upper limit control circuit, which includes a third PTC thermistor. The third PTC is located at the upper limit position of the water body of the hot water pool. The third PTC thermistor is connected in series in the third voltage divider circuit. The output of the third voltage divider circuit is connected to one input end of the second comparison circuit, the other input end of the second comparison circuit is connected to the reference voltage, and the output end of the second comparison circuit is used to control the third water pump.

[0019] Preferably, the first comparison circuit and the second comparison circuit both include operational amplifiers.

[0020] Further preferably, the operational amplifier is UA741.

[0021] Preferably, the single chip microcomputer is connected to the first water pump and the second water pump via a driving module, and the driving module is TB6612.

[0022] Preferably, the temperature measurement module is DS18B20.

[0023] Preferably, the single chip microcomputer is an STM32 series single chip microcomputer, and the single chip microcomputer is connected to an OLED display screen.

[0024] The working principle of this utility model is as follows:

[0025] This utility model uses a heated hot water tank to provide high-temperature water and a cold water tank to provide cold water. The hot water is mixed in a hot and cold mixing water tank and then delivered to a showerhead. The water temperature in the hot water tank is controlled by a constant temperature control circuit. Based on the water temperatures in the hot and cold water tanks, the flow rates or water supply intervals of the first and second water pumps are appropriately adjusted via a single-chip microcomputer to maintain a constant water temperature in the hot and cold mixing water tanks. The water temperature in the hot and cold mixing water tanks is also monitored in real time via a temperature measurement module.

[0026] The beneficial effects of the utility model are as follows:

[0027] 1. The utility model can realize constant temperature control of the shower head.

[0028] 2. The utility model can effectively control the water level of the hot water pool.

[0029] 3. The present invention can achieve the purpose of constant temperature of the shower head by adjusting the flow rate of the first water pump and the second water pump, so that the PTC thermistor can be effectively used for temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a system structure diagram of the utility model.

[0031] Figure 2 This is the circuit schematic diagram of the constant temperature control circuit.

[0032] Figure 3 This is the circuit schematic diagram of the water level upper limit control + constant temperature control circuit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] This embodiment discloses an intelligent constant temperature shower head. Figure 1As shown, this embodiment includes a cold water pool, a hot water pool and a cold and hot mixing water tank, the cold and hot mixing water tank is connected to the shower head, the cold water pool supplies water to the cold and hot mixing water tank through a first water pump, and the hot water pool supplies water to the cold and hot mixing water tank through a second water pump;

[0036] The hot water pool is provided with a heating rod, and the power supply circuit of the electric heating rod is connected in series with the contact of a relay. The relay is controlled by a constant temperature control circuit. The constant temperature control circuit includes a first PTC thermistor. The first PTC thermistor is used to sense the water temperature in the hot water pool. The first PTC thermistor is connected in series with a first voltage divider circuit. The output of the first voltage divider circuit is used to control the on and off of the relay.

[0037] The hot and cold mixed water tank is provided with a temperature measuring module, which is used to detect the water temperature in the hot and cold mixed water tank, and the temperature measuring module is connected to the single chip microcomputer;

[0038] The first water pump and the second water pump are both controlled by the single chip microcomputer.

[0039] like Figure 2 As shown, the output of the first voltage divider circuit is connected to one input of the first comparator circuit, the other input of the first comparator circuit is connected to the reference voltage, and the output of the first comparator circuit is used to control the on and off of the relay. Resistor R6 is a first PTC thermistor made of thermal ceramic material.

[0040] The first comparison circuit is formed by an operational amplifier. In this embodiment, the operational amplifier is UA741.

[0041] Its working principle is: as the temperature rises, the PTC resistance increases, and the divided voltage gradually increases until it reaches the upper threshold, the relay is disconnected, and heating stops. Then, as the temperature slowly drops to the set lower threshold voltage, the relay closes again and starts heating.

[0042] The input of the first voltage divider circuit is connected to the input end of the first PTC thermistor, and the output end of the first voltage divider circuit is connected to the first comparison circuit;

[0043] The single chip microcomputer is connected to the first water pump and the second water pump through the TB6612 driver module.

[0044] Among them: the temperature measurement module is DS18B20; the microcontroller is an STM32 series microcontroller, and the microcontroller is connected to the OLED display.

[0045] The cold water pool is provided with a temperature detection circuit, which includes a second PTC thermistor. The second PTC thermistor is used to sense the water temperature in the cold water pool. The second PTC thermistor is connected in series in a second voltage divider circuit. The output of the second voltage divider circuit is connected to the input end of the A / D converter, and the output end of the A / D converter is connected to the single-chip microcomputer.

[0046] Example 2

[0047] On the basis of Example 1, this embodiment adds a liquid level control function, specifically as follows: Figure 3 As shown,

[0048] The hot water tank is equipped with an upper water level control circuit. The upper water level control circuit includes a third PTC thermistor located at the upper water level of the hot water tank. The third PTC thermistor is connected in series with a third voltage divider circuit. The output of the third voltage divider circuit is connected to one input of a second comparator circuit. The other input of the second comparator circuit is connected to a reference voltage. The output of the second comparator circuit is used to control the second water pump. Resistor R3 is a fixed resistor, and the reference voltage is obtained by dividing the power supply through resistor R1 and potentiometer R2.

[0049] The water level limit control circuit uses a voltage comparator composed of a voltage divider circuit to achieve automatic drainage when the water level exceeds the upper limit. When the liquid level exceeds the thermistor ceramic, the temperature of the thermistor ceramic rises, increasing its resistance. This in turn outputs a high level through the circuit, driving the relay to close and the water pump to start draining until the liquid level drops below the thermistor ceramic.

[0050] The second comparison circuit is formed by an operational amplifier. In this embodiment, the operational amplifier is UA741.

[0051] The rest of this embodiment is the same as that of Embodiment 1, and therefore will not be described in detail.

[0052] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. Intelligent constant temperature shower, characterized by: It includes a cold water pool, a hot water pool and a cold and hot mixing water tank, the cold and hot mixing water tank is connected to the shower head, the cold water pool supplies water to the cold and hot mixing water tank through a first water pump, and the hot water pool supplies water to the cold and hot mixing water tank through a second water pump; The hot water pool is provided with an electric heating rod, and a contact of a relay is connected in series in a power supply circuit of the electric heating rod. The relay is controlled by a constant temperature control circuit. The constant temperature control circuit includes a first PTC thermistor. The first PTC thermistor is used to sense the temperature of the water in the hot water pool. The first PTC thermistor is connected in series in a first voltage divider circuit. The output of the first voltage divider circuit is used to control the on and off of the relay. The hot and cold mixed water tank is provided with a temperature measuring module, which is used to detect the water temperature in the hot and cold mixed water tank, and the temperature measuring module is connected to the single chip microcomputer; The first water pump and the second water pump are both controlled by a single chip microcomputer.

2. The intelligent constant temperature shower head according to claim 1, characterized in that: The output of the first voltage divider circuit is connected to one input terminal of a first comparison circuit, the other input terminal of the first comparison circuit is connected to a reference voltage, and the output terminal of the first comparison circuit is used to control the on and off of the relay.

3. The intelligent constant temperature shower head according to claim 1, characterized in that: The input of the first voltage divider circuit is connected to the input end of the first PTC thermistor, and the output end of the first voltage divider circuit is connected to the first comparison circuit; The cold water pool is provided with a temperature detection circuit, which includes a second PTC thermistor. The second PTC thermistor is used to sense the water temperature in the cold water pool. The second PTC thermistor is connected in series in a second voltage divider circuit. The output of the second voltage divider circuit is connected to the input end of an A / D converter, and the output end of the A / D converter is connected to a single-chip microcomputer.

4. The intelligent constant temperature shower head according to claim 3, characterized in that: The first PTC thermistor and the second PTC thermistor are both ceramic resistors.

5. The intelligent constant temperature shower head according to claim 2, characterized in that: The hot water pool is provided with a water level upper limit control circuit, which includes a third PTC thermistor. The third PTC is located at the upper limit of the water level in the hot water pool. The third PTC thermistor is connected in series in the third voltage divider circuit. The output of the third voltage divider circuit is connected to one input end of the second comparison circuit, the other input end of the second comparison circuit is connected to a reference voltage, and the output end of the second comparison circuit is used to control the second water pump.

6. The intelligent constant temperature shower head according to claim 5, characterized in that: The first comparison circuit and the second comparison circuit both include an operational amplifier.

7. The intelligent constant temperature shower head according to claim 6, characterized in that: The operational amplifier is UA741.

8. The intelligent constant temperature shower head according to claim 1, characterized in that: The single chip microcomputer is connected to the first water pump and the second water pump via a driving module, and the driving module is TB6612.

9. The intelligent constant temperature shower head according to claim 1, characterized in that: The temperature measurement module is DS18B20.

10. The intelligent constant temperature shower head according to claim 1, characterized in that: The single chip microcomputer is an STM32 series single chip microcomputer, and the single chip microcomputer is connected to an OLED display screen.

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