A live water heating system with thermostat control and redundant heating function

Abstract

The utility model discloses a kind of live water heating system with constant temperature control and redundancy heating function, including front heater, middle heater and rear heater, water pipe passes through front heater, middle heater and rear heater in turn;The one end of water pipe close to front heater is used to communicate water source, front heater is electrically connected through first switch and controller, middle heater is electrically connected through second switch and controller, rear heater is electrically connected through third switch and controller;Water pipe between middle heater and rear heater is equipped with first temperature sensor, water pipe downstream of rear heater is equipped with second temperature sensor, first temperature sensor and second temperature sensor are electrically connected with controller.The utility model can stably output set temperature hot water, and has anti-damage redundancy capability.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher cleaning system technology, and in particular to a live water heating system with constant temperature control and redundant heating functions. Background Technology

[0002] A dishwasher is a device that automatically cleans tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Fully automatic dishwashers on the market can be divided into two categories: household and commercial. Household fully automatic dishwashers are only suitable for home use and mainly include cabinet-style, countertop-style, sink-integrated, and combined models. Commercial dishwashers can be classified into five main categories according to their structure: cabinet-style, hood-style, basket-type, belt-type, and ultrasonic. They reduce the labor intensity of kitchen staff in restaurants, hotels, and government canteens, improve work efficiency, and enhance hygiene.

[0003] Traditional dishwashers have a heating function, which can heat the washing water to a specified temperature before rinsing the dishes. However, they have the following problems: 1. Water temperature fluctuation: Traditional single-stage heating systems are affected by seasonal water temperature (2℃~32℃) and flow rate, resulting in unstable output water temperature (50℃~80℃); 2. Low reliability: High-power single-stage heating (25KW) has a large current load, and solid-state relays are prone to overheating and damage. Utility Model Content

[0004] The purpose of this invention is to provide a live water heating system with constant temperature control and redundant heating functions, which can stably output hot water at the set temperature and has redundancy capability against damage.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A live water heating system with constant temperature control and redundant heating functions includes a front heater, a middle heater, and a rear heater. Water pipes pass through the front heater, the middle heater, and the rear heater in sequence. One end of the water pipe near the front heater is connected to a water source. The front heater is electrically connected to a controller via a first switch, the middle heater is electrically connected to a controller via a second switch, and the rear heater is electrically connected to a controller via a third switch. A first temperature sensor is installed in the water pipe between the middle heater and the rear heater, and a second temperature sensor is installed in the water pipe downstream of the rear heater. Both the first and second temperature sensors are electrically connected to the controller.

[0006] In the aforementioned live water heating system with constant temperature control and redundant heating functions, the power of the front heater, the middle heater and the rear heater are all less than 15KW; the first switch is an AC contactor, and the second and third switches are both solid-state relays; a flow switch is installed on the water pipe, and the flow switch is electrically connected to the controller.

[0007] In the aforementioned live water heating system with constant temperature control and redundant heating functions, the power of the front heater, the middle heater and the rear heater is 9KW. The front heater, the middle heater and the rear heater, the controller, the first switch, the second switch and the third switch are all located inside the housing. A display screen is installed on the housing, and the display screen and the controller are electrically connected. An air switch is also installed inside the housing, and the controller is connected to the mains power through the air switch.

[0008] In the aforementioned live water heating system with constant temperature control and redundant heating functions, a cooling fan is installed inside the outer casing. The cooling fan is electrically connected to the controller, and the cooling fan faces the second switch and the third switch.

[0009] In the aforementioned live water heating system with constant temperature control and redundant heating functions, the controller model is HEAT3; the first temperature sensor and the second temperature sensor model is WRX-31; the flow switch model is SK-4040-CL; the solid-state relay model is CDG1-1DA / 40; and the AC contactor model is CJX2-3210. The controller's L and N pins are connected to the mains power, the O, S, and 5 pins are connected to the flow switch, the T2- and T2+ pins are connected to the second temperature sensor, the T1- and T1+ pins are connected to the first temperature sensor, the 5V pin, Y1 pin, and Y2 pins are connected to the second and third switches, the RELAY pin is connected to the third switch, and the FAN pin is connected to the cooling fan.

[0010] The above-described method of using a live water heating system with constant temperature control and redundant heating functions includes the following: The flow switch monitors the water flow in the pipe in real time and sends the detection signal to the controller; when the water flow in the pipe reaches the threshold, the controller controls the first switch to supply power to the front heater. The first temperature sensor monitors the water temperature in the pipe between the intermediate heater and the rear heater in real time. If the water temperature is lower than the threshold, the controller controls the second switch to supply power to the intermediate heater. If the water temperature is higher than the threshold, the controller controls the second switch to not supply power to the intermediate heater. The second temperature sensor monitors the water temperature in the downstream pipe of the downstream heater in real time. If the water temperature is lower than the threshold, the controller controls the third switch to supply power to the downstream heater. If the water temperature is higher than the threshold, the controller controls the third switch to stop supplying power to the downstream heater.

[0011] The aforementioned method of using a live water heating system with constant temperature control and redundant heating functions further includes the following: a flow switch monitors the water flow in the water pipe in real time and sends the detection signal to the controller; when the water flow reaches the threshold, heating is started after a delay of 10 to 15 seconds to expel air from the water pipe and prevent dry burning; when the water flow is below the threshold, heating is cut off by the controller.

[0012] Compared with existing technologies, this invention can stably output hot water at the set temperature and has redundancy against damage. It also has the following advantages: 1. Constant temperature performance: Reduces the outlet water temperature fluctuation range from ±15℃ to ±2℃; 2. Safety: Automatic power cut-off in case of water outage, preventing dry burning accidents; 3. Reliability: Three-level redundancy design ensures the system maintains 70% performance output even in the event of a single point of failure; 4. Cost optimization: Graded drive reduces single-channel current load, reducing the cost of high-power components. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 yes Figure 2 A structural diagram from another perspective; Figure 4 This is a schematic diagram of the present invention; Figure 5 This is a schematic diagram of the circuit connection relationship of this utility model.

[0014] Reference numerals: 1-Rear heater, 2-Middle heater, 3-Front heater, 4-Air switch, 5-Display screen, 6-First switch, 7-Controller, 8-Third switch, 9-Second switch, 10-Flow switch, 11-First temperature sensor, 12-Water pipe, 13-Second temperature sensor.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0016] Embodiment 1 of this utility model: A live water heating system with constant temperature control and redundant heating functions includes a front heater 3, a middle heater 2, and a rear heater 1. A water pipe 12 passes through the front heater 3, the middle heater 2, and the rear heater 1 in sequence. One end of the water pipe 12 near the front heater 3 is connected to a water source. The front heater 3 is electrically connected to the controller 7 via a first switch 6, the middle heater 2 is electrically connected to the controller 7 via a second switch 9, and the rear heater 1 is electrically connected to the controller 7 via a third switch 8. A first temperature sensor 11 is installed on the water pipe 12 between the middle heater 2 and the rear heater 1, and a second temperature sensor 13 is installed on the water pipe 12 downstream of the rear heater 1. Both the first temperature sensor 11 and the second temperature sensor 13 are electrically connected to the controller 7. The power of the front heater 3, the middle heater 2, and the rear heater 1 is less than 15KW. The first switch 6 is an AC contactor, and the second switch 9 and the third switch 8 are both solid-state relays. A flow switch 10 is installed on the water pipe 12, and the flow switch 10 is electrically connected to the controller 7.

[0017] Working principle of Example 1: The controller 7 detects the water temperature at a designated location in the water pipe through the first temperature sensor 11 and the second temperature sensor 13. If the water temperature in the water pipe 12 between the middle heater 2 and the rear heater 1 reaches a threshold (e.g., 80 degrees Celsius), the controller 7 controls the middle heater 2 and the rear heater 1 to be powered off through the second switch 9 and the third switch 8, supplying power only to the front heater 3. If the water temperature in the water pipe 12 between the middle heater 2 and the rear heater 1 does not reach the threshold (e.g., 80 degrees Celsius), but the water pipe 12 downstream of the rear heater 1 reaches the threshold, the controller 7 controls the first switch 6, the second switch 9, and the third switch 8 to supply power to the front heater 3 and the middle heater 2, but not to the rear heater 1. If the water temperature in the water pipe 12 downstream of the rear heater 1 does not reach the threshold, the controller 7 controls the first switch 6, the second switch 9, and the third switch 8 to supply power to the front heater 3, the middle heater 2, and the rear heater 1.

[0018] Example 2: A live water heating system with constant temperature control and redundant heating functions includes a front heater 3, a middle heater 2, and a rear heater 1. A water pipe 12 passes through the front heater 3, the middle heater 2, and the rear heater 1 in sequence. One end of the water pipe 12 near the front heater 3 is connected to a water source. The front heater 3 is electrically connected to the controller 7 via a first switch 6, the middle heater 2 is electrically connected to the controller 7 via a second switch 9, and the rear heater 1 is electrically connected to the controller 7 via a third switch 8. A first temperature sensor 11 is installed on the water pipe 12 between the middle heater 2 and the rear heater 1, and a second temperature sensor 13 is installed on the water pipe 12 downstream of the rear heater 1. Both the first temperature sensor 11 and the second temperature sensor 13 are electrically connected to the controller 7. The power of the front heater 3, the middle heater 2, and the rear heater 1 is less than 15KW. The first switch 6 is an AC contactor, and the second switch 9 and the third switch 8 are both solid-state relays. A flow switch 10 is installed on the water pipe 12, and the flow switch 10 is electrically connected to the controller 7.

[0019] The front heater 3, middle heater 2, and rear heater 1 each have a power of 9KW. The front heater 3, middle heater 2, rear heater 1, controller 7, first switch 6, second switch 9, and third switch 8 are all located inside the housing. A display screen 5 is mounted on the housing and is electrically connected to the controller 7. An air switch 4 is also installed inside the housing, and the controller 7 is connected to the mains power supply via the air switch 4. A cooling fan is installed inside the housing and is electrically connected to the controller 7, with the cooling fan facing the second switch 9 and the third switch 8.

[0020] Working principle of Example 2: Previous heaters had a power of around 25KW, resulting in a large single-unit power load and a high current load on the controller relays, making solid-state relays prone to overheating and damage. This solution uses three 9KW heaters instead of the previous 25KW heaters, resulting in a smaller single-unit power load, a lower current load on the solid-state relays, more stable relay operation, and less susceptibility to damage. Furthermore, the water pipe 12 has a flow switch 10 that can detect the flow rate in the pipe. If the flow rate is insufficient, the controller 7 will not supply power to the heaters, preventing dry burning.

[0021] The controller 7 detects the water temperature at a designated location in the water pipe using the first temperature sensor 11 and the second temperature sensor 13. If the water temperature in the water pipe 12 between the intermediate heater 2 and the downstream heater 1 reaches a threshold (e.g., 80 degrees Celsius), the controller 7 controls the intermediate heater 2 and the downstream heater 1 to disconnect power via the second switch 9 and the third switch 8, supplying power only to the front heater 3. If the water temperature in the water pipe 12 between the intermediate heater 2 and the downstream heater 1 does not reach the threshold (e.g., 80 degrees Celsius), but the water pipe 12 downstream of the downstream heater 1 reaches the threshold, the controller 7 controls the first switch 6, the second switch 9, and the third switch 8 to supply power to the front heater 3 and the intermediate heater 2, but not to the downstream heater 1. If the water temperature in the water pipe 12 downstream of the downstream heater 1 does not reach the threshold, the controller 7 controls the first switch 6, the second switch 9, and the third switch 8 to supply power to the front heater 3, the intermediate heater 2, and the downstream heater 1.

[0022] Example 3: A live water heating system with constant temperature control and redundant heating functions includes a front heater 3, a middle heater 2, and a rear heater 1. A water pipe 12 passes through the front heater 3, the middle heater 2, and the rear heater 1 in sequence. One end of the water pipe 12 near the front heater 3 is connected to a water source. The front heater 3 is electrically connected to the controller 7 via a first switch 6, the middle heater 2 is electrically connected to the controller 7 via a second switch 9, and the rear heater 1 is electrically connected to the controller 7 via a third switch 8. A first temperature sensor 11 is installed on the water pipe 12 between the middle heater 2 and the rear heater 1, and a second temperature sensor 13 is installed on the water pipe 12 downstream of the rear heater 1. Both the first temperature sensor 11 and the second temperature sensor 13 are electrically connected to the controller 7. The power of the front heater 3, the middle heater 2, and the rear heater 1 is less than 15KW. The first switch 6 is an AC contactor, and the second switch 9 and the third switch 8 are both solid-state relays. A flow switch 10 is installed on the water pipe 12, and the flow switch 10 is electrically connected to the controller 7.

[0023] The front heater 3, middle heater 2, and rear heater 1 each have a power of 9KW. The front heater 3, middle heater 2, rear heater 1, controller 7, first switch 6, second switch 9, and third switch 8 are all located inside the housing. A display screen 5 is mounted on the housing and is electrically connected to the controller 7. An air switch 4 is also installed inside the housing, and the controller 7 is connected to the mains power supply via the air switch 4. A cooling fan is installed inside the housing and is electrically connected to the controller 7, with the cooling fan facing the second switch 9 and the third switch 8.

[0024] The controller 7 is model HEAT3; the first temperature sensor 11 and the second temperature sensor 13 are model WRX-31; the flow switch 10 is model SK-4040-CL; the solid-state relay is model CDG1-1DA / 40; the AC contactor is model CJX2-3210; the L and N pins of the controller 7 are connected to the mains power, the O, S and 5 pins are connected to the flow switch 10, the T2- and T2+ pins are connected to the second temperature sensor 13, the T1- and T1+ pins are connected to the first temperature sensor 11, the 5V pin, Y1 pin and Y2 pin are connected to the second switch 9 and the third switch 8, the RELAY pin is connected to the third switch 8, and the FAN pin is connected to the cooling fan.

[0025] like Figure 5 As shown, L, N: 220V AC power input positions. L is the live wire and N is the neutral wire. Note that the live and neutral wires must be connected correctly for the high-voltage output of the output control terminal below to correctly drive the AC contactor and fan; Water flow sensor: Generally, water flow sensors are 3-wire, red for power, black for ground, and yellow for signal. Terminal 0 corresponds to 0V, 5V corresponds to the low-voltage 5V output, and S corresponds to the signal input terminal. T1, T2 thermocouples: This heating control is divided into 3 sections. The first section of heating does not require temperature reading, while the latter two sections use K thermocouples to read the temperature. The thermocouple of the middle section is connected to T1, and the thermocouple of the last section is connected to T2. Note that thermocouples have positive and negative terminals. Generally, red is positive and blue is negative.

[0026] 5V: DC drive positive common terminal for solid-state relays; Y1: Mid-section solid-state relay drive terminal, outputs 0V when active; Y2: Rear-section solid-state relay drive terminal, outputs 0V when active. RELAY: AC contactor drive terminal for the front heating wire, outputs AC L when active, as shown in the diagram. The other end of the AC contactor coil is connected to the 220V N terminal; FAN: 220V cooling fan drive, outputs AC L when active, as shown in the diagram. The other end of the fan power supply is connected to the 220V N terminal. All high-voltage components use the neutral wire N as the common terminal. Y3 and Y4 are reserved for debugging outputs and are not currently used. These two terminals may be removed in future upgrades.

[0027] Control board parameters: When the water flow sensor reaches 100 revolutions per second or higher, the heating process automatically begins; below this value, the heating wire drive output is shut off. The heating process begins with a 15-second delay before all three heating wires are activated; this delay ensures that all air in the heating element is completely expelled before heating begins. The first heating wire does not use temperature control and remains conductive during idle periods. The middle and rear heating wires use a PID algorithm for temperature control, based on data read from the K thermocouple. The system defaults to a target temperature of 60 degrees Celsius for the middle heating section and 75 degrees Celsius for the rear heating section. When the heating wires begin heating, the cooling fan will continuously run to dissipate heat from the solid-state relay. When the system stops heating, the fan will remain on for 10 seconds before shutting off.

[0028] The above embodiment describes a method for using a live water heating system with constant temperature control and redundant heating functions, which includes the following: the flow switch 10 monitors the water flow in the water pipe 12 in real time and sends the detection signal to the controller 7; when the flow in the water pipe 12 is detected to reach a threshold, the controller 7 controls the first switch 6 to supply power to the front heater 3. The first temperature sensor 11 monitors the water temperature in the water pipe 12 between the middle section heater 2 and the rear section heater 1 in real time. If the water temperature is lower than the threshold, the controller 7 controls the second switch 9 to supply power to the middle section heater 2. If the water temperature is higher than the threshold, the controller 7 controls the second switch 9 to not supply power to the middle section heater 2. The second temperature sensor 13 monitors the water temperature in the water pipe 12 downstream of the downstream heater 1 in real time. If the water temperature is lower than the threshold, the controller 7 controls the third switch 8 to supply power to the downstream heater 1. If the water temperature is higher than the threshold, the controller 7 controls the third switch 8 to not supply power to the downstream heater 1.

[0029] The flow switch 10 monitors the water flow in the water pipe 12 in real time and sends the detection signal to the controller 7. When the water flow reaches the threshold, heating is started after a delay of 10 to 15 seconds to expel the air in the water pipe 12 and prevent dry burning. When the water flow is lower than the threshold, heating is cut off by the controller 7.

Claims

1. A live water heating system with constant temperature control and redundant heating functions, characterized in that, It includes a front heater (3), a middle heater (2) and a rear heater (1), and a water pipe (12) passes through the front heater (3), the middle heater (2) and the rear heater (1) in sequence. One end of the water pipe (12) near the front heater (3) is used to connect to the water source. The front heater (3) is electrically connected to the controller (7) via the first switch (6), the middle heater (2) is electrically connected to the controller (7) via the second switch (9), and the rear heater (1) is electrically connected to the controller (7) via the third switch (8). A first temperature sensor (11) is provided on the water pipe (12) between the middle section heater (2) and the rear section heater (1), and a second temperature sensor (13) is provided on the water pipe (12) downstream of the rear section heater (1). Both the first temperature sensor (11) and the second temperature sensor (13) are electrically connected to the controller (7).

2. A live water heating system with constant temperature control and redundant heating functions according to claim 1, characterized in that, The power of the front heater (3), the middle heater (2) and the rear heater (1) is less than 15KW; the first switch (6) is an AC contactor, and the second switch (9) and the third switch (8) are solid-state relays; a flow switch (10) is installed on the water pipe (12), and the flow switch (10) is electrically connected to the controller (7).

3. A live water heating system with constant temperature control and redundant heating functions according to claim 1, characterized in that, The power of the front heater (3), the middle heater (2) and the rear heater (1) is 9KW. The front heater (3), the middle heater (2), the rear heater (1), the controller (7), the first switch (6), the second switch (9) and the third switch (8) are all located inside the housing. A display screen (5) is installed on the housing, and the display screen (5) and the controller (7) are electrically connected. An air switch (4) is also installed inside the housing, and the controller (7) is connected to the mains power through the air switch (4).

4. A live water heating system with constant temperature control and redundant heating functions according to claim 1, characterized in that, A cooling fan is installed inside the casing. The cooling fan is electrically connected to the controller (7). The cooling fan faces the second switch (9) and the third switch (8).

5. A live water heating system with constant temperature control and redundant heating functions according to claim 4, characterized in that, The controller (7) is model HEAT3; the first temperature sensor (11) and the second temperature sensor (13) are model WRX-31; the flow switch (10) is model SK-4040-CL; the solid-state relay is model CDG1-1DA / 40; and the AC contactor is model CJX2-3210. The L and N pins of the controller (7) are connected to the mains power, the O, S and 5 pins are connected to the flow switch (10), the T2- and T2+ pins are connected to the second temperature sensor (13), the T1- and T1+ pins are connected to the first temperature sensor (11), the 5V pin, Y1 pin and Y2 pin are connected to the second switch (9) and the third switch (8), the RELAY pin is connected to the third switch (8), and the FAN pin is connected to the cooling fan.

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