New type of electric heating steam generator

Abstract

This novel electric heating steam generator belongs to the field of steam generator technology. It includes an electric heating steam generator body and an air pump; it also features a control circuit, a wastewater recycling mechanism, and a trigger circuit. The wastewater recycling mechanism includes a water level switch, a solenoid valve, and a cylinder. The water level switch, solenoid valve, and cylinder are installed together and connected to a water-air separator and a water replenishment pump. Two electric heating tubes are installed at the lower end of the water tank. The control circuit and trigger circuit are installed in a control box and electrically connected. In this novel generator, after a certain amount of water has been separated from the steam in the cylinder, the high-compressed air output by the air pump forces the heated water into the tank, effectively utilizing the heat of the separated water and saving water resources. When the temperature inside the tank exceeds a set threshold, the main electric heating tube stops working, while the auxiliary electric heating tube continues to heat the water in the tank, preventing the problem of unstable steam output caused by large temperature fluctuations in existing technologies that use only one set of electric heating tubes.

Description

Technical Field

[0001] This utility model relates to the technical field of steam generator equipment, and in particular to a novel electrically heated steam generator. Background Technology

[0002] An electric heating steam generator is a device that uses electricity to heat water and produce steam. It is used in industrial production, medical treatment, food processing and other fields. The main structure consists of a water tank, electric heating elements (such as electric heating tubes), water supply pump, control system and safety devices (such as pressure gauges, safety valves), water level gauge, etc. Some high-end models use a PLC automatic control system to achieve intelligent management.

[0003] Electric steam generators produce steam containing moisture. To minimize the negative impact of this moisture on the use of pure steam in subsequent processes, electric steam generators typically employ water-vapor separation equipment (water-vapor separators) to remove the moisture. The separated water is discharged after a certain quantity is reached or after the generator is shut down. However, this method wastes water resources because the separated water is directly discharged, and the significant amount of heat in the water remains unused, resulting in a waste of electrical energy. Furthermore, existing electric heating steam generators use only one set of electric heating tubes (or multiple tubes connected in parallel at the power input terminals). During operation, under the action of the temperature control switch, the electric heating tubes stop working temporarily when the temperature inside the tank (water tank) of the electric heating steam generator exceeds the set threshold. When the temperature falls below the set threshold, the electric heating tubes start working again. Although the above method achieves the purpose of temperature control to a certain extent, in reality, it takes a certain amount of time for the electric heating tubes to go from receiving power to full power output. Therefore, during this period, the electric heating tubes provide relatively insufficient heat to the tank, resulting in a relatively low temperature inside the tank and insufficient steam production. This has more or less had a negative impact on the normal operation and continuous and stable steam production. Utility Model Content

[0004] To overcome the shortcomings of existing electric heating steam generators due to structural limitations, as described in the background art, this utility model provides a new type of electric heating steam generator. Based on the main body of the electric heating steam generator, in application, under the combined action of related mechanisms, after a certain amount of water has been separated from steam, the heated water can be pressurized into the tank. This effectively utilizes the heat of the separated water while saving water resources. Furthermore, it has two sets of electric heating tubes. When the temperature inside the tank exceeds a set threshold, the main electric heating tube can be controlled to stop working while the auxiliary electric heating tube continues to heat the water inside the tank. This prevents the relatively unstable steam output caused by using only one set of electric heating tubes and excessive temperature changes.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A novel electric heating steam generator includes an electric heating steam generator body and an air pump; it also has a control circuit, a wastewater reuse mechanism, and a trigger circuit. The wastewater reuse mechanism includes a water level switch, solenoid valves, and a cylinder. An inlet pipe and a drain pipe are fixedly installed at the upper and lower ends of the cylinder, respectively. The air inlet end of the water-gas separator tank of the electric heating steam generator body and the exhaust end of the water tank are fixedly connected. The exhaust end of the water-gas separator tank is connected to the air inlet pipe of the steam-using equipment. Multiple solenoid valves are included. The side of the drain pipe of the water-gas separator tank is fixedly connected to one end of the first solenoid valve, and the other end of the first solenoid valve is fixedly connected to the water inlet pipe of the cylinder. The drain pipe of the cylinder is fixedly connected in parallel to one end of the second solenoid valve and one end of the third solenoid valve. The other end of the second solenoid valve is fixedly connected to the water supply pipe of the water tank, and the other end of the third solenoid valve is fixedly connected to... The water supply pump outlet pipe of the electric heating steam generator body is fixedly connected, the water supply pump inlet pipe is fixedly connected to the tap water pipe, and the water level switch is fixedly installed on one side of the cylinder body; a connecting pipe is fixedly installed on one side of the outer end of the cylinder body, the upper end of the connecting pipe is fixedly connected to one end of the fourth solenoid valve, and the other end of the fourth solenoid valve is fixedly connected to the exhaust end of the air pump; the electric heating steam generator body has at least two sets of electric heating tubes, and the two electric heating tubes are respectively fixedly installed on the lower end of the water tank; the control circuit and the trigger circuit are installed in the control box; the power output terminal of the control circuit is electrically connected to the power input terminal of one set of electric heating tubes, the power output terminal of the trigger circuit is electrically connected to the power input terminals of multiple solenoid valves respectively, and the two terminals of the water level switch are electrically connected to the two signal input terminals of the trigger circuit respectively.

[0007] Furthermore, the first solenoid valve is a normally open solenoid valve, while the second, third, and fourth solenoid valves are normally closed solenoid valves.

[0008] Furthermore, the height of the cylinder is lower than the height of the water vapor separator.

[0009] Furthermore, the trigger circuit includes a power switch, a time relay module, and a diode that are electrically connected; one end of the three power switches is connected to the positive power input terminal of the time relay module, the other end of the first power switch is connected to the positive terminal of the first diode, the other end of the second power switch is connected to the positive terminal of the second diode, the negative terminals of the first diode, the second diode, and the third diode are connected, the negative power input terminal of the time relay module is connected to the negative signal input terminal, and the power output terminal of the time relay module is connected to the positive terminal of the third diode.

[0010] Furthermore, the control circuit includes an electrically connected thermistor, resistor, relay, and voltage comparator. The thermistor is fixedly installed on the outer end of the water tank. One end of the thermistor is connected to one end of the resistor and the positive signal input terminal of the voltage comparator. The negative power input terminal and negative signal input terminal of the voltage comparator are connected to the negative power input terminal of the relay. The positive power input terminal of the relay is connected to the power output terminal of the voltage comparator. The other end of the thermistor is connected to the positive power input terminal of the voltage comparator.

[0011] Compared with the prior art, the advantages of this utility model are: (1) Based on the electric heating steam generator body, after the water in the cylinder and the water vapor separation has a certain amount, the high compressed air output by the air pump can press the water with heat into the tank. In this way, the heat of the separated water is effectively utilized and the water source is saved; (2) This utility model has two sets of electric heating tubes. Under the joint action of the control circuit and the trigger circuit, when the temperature in the tank exceeds the set threshold, the main electric heating tube can be controlled to stop working and the auxiliary electric heating tube can continue to be heated to heat the water in the tank. This prevents the problem of the prior art using only one set of electric heating tubes and the large temperature change leading to relatively unstable output steam. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a partial structural schematic diagram of the present invention.

[0015] Figure 3 This is the circuit diagram of this utility model. Detailed Implementation

[0016] Figure 1 , 2As shown in Figure 3, the novel electric heating steam generator includes an electric heating steam generator body 5 with a water tank 1, electric heating tubes, a water supply pump (not shown in the figure), a control system 2 and safety devices (such as pressure gauge 31, safety valve 32), a water-vapor separator 4, a water level gauge 10, etc., a power supply module E1, and an air pump (not shown in the figure); it also has a control circuit 6, a wastewater reuse mechanism, and a trigger circuit 8; the wastewater reuse mechanism includes a water level switch S4 and solenoid valves DC1, DC2, DC3, and DC4. The cylinder 71 has an inlet pipe 72 and a drain pipe 73, which are connected to its interior, fixedly installed on the outer side of the upper and lower middle parts of the cylinder 71, respectively. The air inlet of the water-gas separator 4 and the exhaust of the water tank 1 are fixedly connected by a pipe. The exhaust of the water-gas separator 4 and the air inlet of the steam-using equipment (not shown in the figure) are fixedly connected by a pipe. There are four solenoid valves DC1, DC2, DC3, and DC4. The right side of the drain pipe at the lower right end of the water-gas separator 4 is fixedly connected to one end of the first solenoid valve DC1. The other end of DC1 is fixedly connected to the water inlet pipe of the cylinder 72. The drain pipe 73 at the lower end of the cylinder is fixedly connected to the first end of a three-way pipe. The second and third ends of the three-way pipe are fixedly connected to one end of the second solenoid valve DC2 and one end of the third solenoid valve DC3, respectively. The other end of the second solenoid valve DC2 is fixedly connected to the water supply pipe 101 of the water tank. The other end of the third solenoid valve DC3 is fixedly connected to the outlet pipe of the water supply pump. The inlet pipe of the water supply pump is fixedly connected to the tap water pipe, etc. The water level switch S4 is fixedly installed on the cylinder. The right side of the body; a connecting pipe 74 that communicates with the inside is fixedly installed on the right side of the outer end of the cylinder. The upper end of the connecting pipe 74 is fixedly connected to one end of the fourth solenoid valve DC4, and the other end of the fourth solenoid valve DC4 is fixedly connected to the exhaust end of the air tank of the air pump through a pipe; there are two sets of electric heating tubes RT and RT1. The two electric heating tubes RT and RT1 are fixedly installed on the lower end of the water tank 1. The power module E1, the control circuit 6, and the trigger circuit 8 are installed in the control box 9 of the electric heating steam generator body.

[0017] Figure 1 , 2As shown in Figure 3, the first solenoid valve DC1 is a normally open solenoid valve, and the second solenoid valve DC2, the third solenoid valve DC3, and the fourth solenoid valve DC4 are normally closed solenoid valves. The height of the cylinder 71 is lower than the height of the water vapor separator 4. The trigger circuit includes power switches S1, S2, and S3 connected via circuit board wiring, a time relay module E2, and diodes V1, V2, and V3; one end of the three power switches S1, S2, and S3 is connected to the positive power input terminal 1 of the time relay module E2, the other end of the first power switch S1 is connected to the positive terminal of the first diode V1, the other end of the second power switch S2 is connected to the positive terminal of the second diode V2, the negative terminals of the first diode V1, the second diode V2, and the third diode V3 are connected, the negative power input terminal 2 of the time relay module E2 is connected to the negative signal input terminal 4, and the power output terminal 5 of the time relay module E2 is connected to the positive terminal of the third diode V3. The control circuit includes a thermistor RT, a resistor R1, a relay K1, and a voltage comparator E3 connected via circuit board wiring. The thermistor RT is fixedly installed on the right outer side of the water tank 1 (with its sensing surface in close contact with the right outer side of the water tank). One end of the thermistor RT is connected to one end of the resistor R1 and pin 3 of the positive signal input terminal of the voltage comparator E3. Pin 2 and pin 4 of the negative power input terminal of the voltage comparator E3 are connected to the negative power input terminal of the relay K1. The positive power input terminal of the relay K1 is connected to pin 5 of the power output terminal of the voltage comparator E3. The other end of the thermistor RT is connected to pin 1 of the positive power input terminal of the voltage comparator RT.

[0018] Figure 1 , 2 As shown in Figure 3, the power input terminals 1 and 2 of power module E1, the power input terminal of one set of electric heating tubes RT1, the two control power input terminals of relay K1 in the control circuit, and the two poles of the AC 220V power supply are connected by wires. The power output terminals 3 and 4 of power module E1, the power input terminal of trigger circuit, the time relay module E2, the power input terminal of control circuit, and the voltage comparator E3, are connected by wires. The two normally closed contacts of relay K1 in the control circuit and the power input terminal of another set of electric heating tubes RT are connected by wires. The negative terminal of diode V1 and the power input terminal of power module E1 are connected by wires to the power input terminal of solenoid valve DC1. The negative terminal of diode V2 and the power input terminal of power module E1 are connected by wires to the power input terminal of solenoid valve DC2. The other end of power switch S3 and the power input terminal of power module E1 are connected by wires to the power input terminal of solenoid valve DC3. The 5 and 2 terminals of time relay module E2 are connected by wires to the power input terminal of solenoid valve DC4. The two terminals of the water level switch S4 and the two signal input terminals of the trigger circuit, as well as the positive signal input terminal 3 and positive power input terminal 3 of the time relay module E2, are connected by wires. Figure 3In this circuit, power module E1 is a finished product of AC 220V to DC 12V power module; relay K1 is model DC12V; solenoid valves DC1, DC2, DC3, and DC4 are 2W DC solenoid valves; diodes V1, V2, and V3 are model 1N4001; resistor R1 has a resistance of 2.2KΩ; thermistor RT is model NTC103D (negative temperature coefficient thermistor); electric heating elements RT and RT1 have a power of 5KW; time relay module E2 is a finished product of time delay relay switch model JK-DE, which has four setting buttons, two power input terminals (pins 1 and 2), two signal input terminals (pins 3 and 4), and one control power input terminal (pin 6). (Connect pin 1), one normally open power output pin 5, and one normally closed power output pin 7 (floating). Operating the four buttons allows you to set the time for the power output from pin 5 after the two signal input terminals receive a power signal. The voltage comparator E3 model is lm393n, which has two power input terminals (pins 1 and 2), two signal input terminals (pins 3 and 4), and a power output terminal (pin 5). Depending on the selected model, the power output terminal outputs power when the power voltage input to the signal input terminals is higher or lower than the set threshold. The voltage comparator itself has an adjustable resistor for setting the threshold voltage. Adjusting the high or low resistance value of the adjustable resistor allows you to set the high or low trigger threshold voltage of the voltage comparator itself.

[0019] Figure 1 , 2 As shown in Figure 3, this novel invention is based on an electrically heated steam generator body 5. Combined with water level data detected by a water level gauge 10, the water level in the tank is adjusted. When the water level in the tank is below a threshold, the power to the water replenishment pump is turned on to add water to the tank 1 (the water replenishment pump pressurizes the water and pumps it into the tank). The electric heating element heats the water in the tank 1 to form steam. The safety valve 32 discharges the overpressure steam from the tank. The water pressure in the tank can be observed through a pressure gauge 31. After the steam passes through a water-steam separator 4 to separate water, it enters the steam-using equipment. The above is existing mature technology, which will not be elaborated upon in this application, nor will it provide any protection for the technical solution of the electrically heated steam generator body 5 itself.

[0020] Figure 1 , 2As shown in Figure 3, after the 220V AC power enters the power input terminal of the power module E1, the 12V DC power output from pins 3 and 4 of the power module E1 enters the power input terminals of the trigger circuit and the control circuit, and the above circuits are powered on and work. In this new type, when replenishing water, the operator turns on the power switches S1, S2, and S3 (due to the unidirectional conduction and reverse cutoff of diode V3, the solenoid valve DC4 will not be energized and the valve core will be closed; and turns on the power switch of the water replenishment pump). As a result, the solenoid valve DC1 is energized and the valve core is closed, while the solenoid valves DC2 and DC3 are energized and the valve cores are opened. In this way, the pressurized water output by the water replenishment pump will enter the water tank 1 through the solenoid valves DC2 and DC3. Combined with the water level data in the water tank detected by the water level gauge 10, and after the water replenishment is completed, the power switches S1, S2, and S3 are turned off. The solenoid valve DC1 is de-energized and the valve core is open, while the solenoid valves DC2 and DC3 are de-energized and the valve cores are closed. Although a small amount of water will remain in the cylinder 71 at this time, it will not affect the normal operation of the equipment. The water will be subsequently pressed into the water tank by compressed air. When 220V power is supplied to the power input terminals of electric heating elements RT1 and RT (the 220V power is controlled by relay K1, and the normally closed contact terminal of the electric heating element RT is connected to the power input terminal), the electric heating elements RT1 and RT are energized to heat the water in water tank 1. The steam is separated from the water by the water-steam separator 4 and then enters the steam usage equipment. The separated water enters the cylinder 71 through the solenoid valve DC1, which is opened by the valve core. When the water in the cylinder 71 is less than a certain level, the float of the water level switch S4 does not rise and its internal contacts do not close. In this case, pin 5 of the time relay module E2 does not output power, and the solenoid valves DC1, DC2, and DC4 are not energized. The separated hot water in the cylinder will not enter the water tank. When the water level in cylinder 71 exceeds a certain level (e.g., more than half the water level in the cylinder), the float of water level switch S4 rises and its internal contacts close. This causes a high-level signal to be input to pin 3 of time relay module E2. Consequently, pin 5 of time relay module E2 outputs power for a period of time (adjustable, e.g., 4 seconds) to the power input terminal of solenoid valve DC4. This power is then unidirectionally conducted through diode V3 to the power input terminals of solenoid valves DC1 and DC2. During the energized time of solenoid valve DC1, the valve core closes. When solenoid valves DC4 and DC2 are energized, the valve cores open. At this moment, the air pump storage tank outputs pressurized air (higher pressure than the water tank) which, through solenoid valves DC4 and DC2, forces the pressurized water in the cylinder into the water tank. Four seconds later, pin 5 of the time relay module E2 stops outputting power. Consequently, solenoid valves DC1, DC2, and DC4 lose power. When solenoid valve DC2 loses power, its valve core opens, allowing hot water after steam separation to re-enter the cylinder 4. When solenoid valve DC4 loses power, its valve core closes, preventing compressed air from entering the cylinder 4. When solenoid valve DC2 loses power, its valve core closes, temporarily stopping the outflow of water that subsequently enters the cylinder.

[0021] Figure 1 , 2As shown in Figure 3, when this new type of device is working, the heat generated by the water tank acts on the heated surface of the thermistor RT. The greater the heat, the smaller the resistance value, and vice versa. When the water tank temperature is below the threshold (e.g., below 110℃), the resistance value of the thermistor RT is relatively large, and the voltage drop between the thermistor RT and resistor R1 is relatively large. At this time, the 12V power supply enters pin 3 of the voltage comparator E3 through the voltage drop between the thermistor RT and resistor R1. Since the voltage drop is lower than the threshold voltage set by the voltage comparator E3, pin 5 of the voltage comparator E3 will not output power. Therefore, the electric heating elements RT and RT1 heat up normally and heat the water in the water tank. When the water tank temperature is above the threshold (e.g., above 110℃), the thermistor RT... The resistance of resistor T is relatively small, and the voltage drop between resistor R1 and T is relatively small. At this moment, the 12V power supply enters pin 3 of voltage comparator E3 through the voltage drop between the thermistor RT and resistor R1. The voltage is higher than the threshold voltage set by voltage comparator E3. Pin 5 of voltage comparator E3 will output power to the positive terminal of relay K1. Then, relay K1 will be energized and its control power input terminal and normally closed contact terminal will be opened. The electric heating tube RT will be de-energized and will no longer heat up. However, RT1 will continue to heat the water in the tank normally. When the water temperature in the tank falls below the threshold again, relay K1 will be de-energized again and its control power input terminal and normally closed contact terminal will be closed. Then, the electric heating tube RT will be energized again and will heat the water in the tank.

[0022] Figure 1 , 2 As shown in Figure 3, through the above, after a certain amount of water has been separated from water vapor in the cylinder, the present invention can use high-compressed air output by the air pump to press the heated water into the tank. In this way, the heat of the separated water is effectively utilized and water resources are saved. When the temperature inside the tank exceeds the set threshold, the main electric heating tube can be controlled to stop working while the auxiliary electric heating tube continues to be energized to heat the water inside the tank. This prevents the problem of relatively unstable steam output caused by large temperature changes when only one set of electric heating tubes is used in the existing technology.

[0023] Those skilled in the art should understand that although this specification describes embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Therefore, the scope of protection of this application is defined by the claims.

Claims

1. A novel electrically heated steam generator, comprising an electrically heated steam generator body and an air pump; characterized in that, It also includes a control circuit, a wastewater reuse mechanism, and a trigger circuit. The wastewater reuse mechanism includes a water level switch, a solenoid valve, and a cylinder. An inlet pipe and a drain pipe are fixedly installed at the upper and lower ends of the cylinder, respectively. The air inlet of the water-gas separator tank of the electric heating steam generator body and the exhaust end of the water tank are fixedly connected. The exhaust end of the water-gas separator tank is connected to the air inlet pipe of the steam-using equipment. There are multiple solenoid valves. The side of the drain pipe of the water-gas separator tank is fixedly connected to one end of the first solenoid valve. The other end of the first solenoid valve is fixedly connected to the water inlet pipe of the cylinder. The drain pipe of the cylinder is fixedly connected in parallel to one end of the second solenoid valve and one end of the third solenoid valve. The other end of the second solenoid valve is fixedly connected to the water supply pipe of the water tank, and the other end of the third solenoid valve is fixedly connected to the water supply pipe of the electric heating steam generator body. The pump outlet pipe is fixedly connected, the water inlet pipe of the water replenishment pump is fixedly connected to the tap water pipe, and the water level switch is fixedly installed on one side of the cylinder; a connecting pipe is fixedly installed on one side of the outer end of the cylinder, the upper end of the connecting pipe is fixedly connected to one end of the fourth solenoid valve, and the other end of the fourth solenoid valve is fixedly connected to the exhaust end of the air pump; the electric heating steam generator body has at least two sets of electric heating tubes, and the two electric heating tubes are respectively fixedly installed on the lower end of the water tank; the control circuit and the trigger circuit are installed in the control box; the power output terminal of the control circuit is electrically connected to the power input terminal of one set of electric heating tubes, the power output terminal of the trigger circuit is electrically connected to the power input terminals of multiple solenoid valves respectively, and the two terminals of the water level switch are electrically connected to the two signal input terminals of the trigger circuit respectively.

2. The novel electrically heated steam generator according to claim 1, characterized in that, The first solenoid valve is a normally open solenoid valve, while the second, third, and fourth solenoid valves are normally closed solenoid valves.

3. The novel electrically heated steam generator according to claim 1, characterized in that, The height of the cylinder is lower than the height of the water vapor separator.

4. The novel electrically heated steam generator according to claim 1, characterized in that, The trigger circuit includes an electrically connected power switch, a time relay module, and a diode. One end of each of the three power switches is connected to the positive power input terminal of the time relay module. The other end of the first power switch is connected to the positive terminal of the first diode. The other end of the second power switch is connected to the positive terminal of the second diode. The negative terminals of the first, second, and third diodes are connected. The negative power input terminal of the time relay module is connected to the negative signal input terminal. The power output terminal of the time relay module is connected to the positive terminal of the third diode.

5. The novel electrically heated steam generator according to claim 1, characterized in that, The control circuit includes an electrically connected thermistor, resistor, relay, and voltage comparator. The thermistor is fixedly installed on the outer end of the water tank. One end of the thermistor is connected to one end of the resistor and the positive signal input terminal of the voltage comparator. The negative power input terminal and negative signal input terminal of the voltage comparator are connected to the negative power input terminal of the relay. The positive power input terminal of the relay is connected to the power output terminal of the voltage comparator. The other end of the thermistor is connected to the positive power input terminal of the voltage comparator.

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