CN104913510B - One kind printing and dyeing heat-treating machine control device and its control method - Google Patents

Abstract

A control device and control method for a printing and dyeing heat treatment machine, relating to a control device and a control method for a heat pump fluid heater utilizing the waste heat of printing and dyeing wastewater, and in particular to a printing and dyeing wastewater heat treatment machine equipped with a three-tank, two-way circulating heat pump hot water unit The control device and the control method for the control device include an operation parameter setting module, a water volume detection control module, a water temperature detection control module, a heat pump controller and a solenoid valve driver; the operation parameter setting module is connected to the water volume detection control module and the water temperature In the detection control module, the liquid level sensor is connected to the water volume detection control module; the first and second water temperature sensors and the outlet water temperature sensor are connected to the input end of the water temperature detection control module; the water temperature detection control module is connected to the first and second electromagnetic valve drivers through the solenoid valve driver. Valve and three-way valve; the control device controls the opening of the water volume regulating valve according to the temperature of the wastewater in the wastewater pool, realizes turbulent heat exchange with small temperature difference, and uses the residual heat of printing and dyeing wastewater to produce hot water.

Description

A printing and dyeing heat treatment machine control device and its control method

technical field

The present invention relates to a control device and a control method for a heat pump fluid heater utilizing the waste heat of printing and dyeing wastewater, and in particular to a control device for a printing and dyeing wastewater heat treatment machine equipped with a three-tank dual-circuit circulating heat pump hot water unit and the control used for the control device method.

Background technique

In the production process of printing and dyeing enterprises, it is necessary to use boilers to heat and supply a large amount of hot water for production. There are mainly two temperature requirements for hot water for production: above 40°C and above 60°C. On the other hand, with the addition of cold and hot water for subsequent rinsing and other processes, more waste hot water with a higher temperature will be produced during the production process, with a water temperature of 35-70 °C. These waste hot water can not be reused after being produced, and can only be directly discharged into the environment after corresponding required treatment. The waste heat in these waste water can not only be used, but may cause thermal pollution to the environment. At the same time, the COD concentration and chloride ion concentration in printing and dyeing wastewater are very high, and it is difficult to use them by simple heat recovery. Existing hot water, steam, cold water, waste water flow process as shown in Figure 1, in the flow process shown in Figure 1, on the one hand, enters the water in the printing and dyeing production equipment 10 (dye vat) from the softening pool 11 is low-temperature cold water, water temperature Usually only 5 ~ 20 ℃, heating is required to meet the temperature requirements of the printing and dyeing process. The heating boilers are mostly steam boilers, coal-fired boilers or electric boilers. This heating method is not energy-saving and environmentally friendly. On the other hand, the waste water with a higher temperature entering the waste water pool 20 must be cooled by the cooling pool 12 before being sent to the biochemical treatment pool 13 for biochemical treatment. These waste heats are not only not utilized, but also cause thermal pollution to the environment. The cooling and conveying process also consumes electrical energy.

Chinese invention patent "A method and system for energy-saving printing and dyeing water utilization of waste heat circulation" (Chinese invention patent number ZL200610027350.2, authorized announcement number CN100586868C) discloses a method and system for energy-saving printing and dyeing water utilization of waste heat circulation, the system includes a cold water tank , process production equipment, waste water mixing pool, waste water source heat pump unit, hot water pool and biochemical treatment pool. The waste water source heat pump unit recycles waste heat, heats the cold water in the waste heat pool into hot water, and then pumps the hot water into the process production equipment through the hot water supply pump for production, forming a waste heat cycle energy-saving printing and dyeing water utilization system. The method includes : Collect the clean waste hot water discharged from the process production equipment into the waste water mixing tank; use the waste water source heat pump unit to recycle the waste heat to heat the cold water, and store the hot water in the hot water pool; the hot water in the hot water pool is supplied to the process production equipment for use. The invention can obviously save energy consumption, and improve the temperature difference between cold water and steam entering the process production equipment, so that the opening of the heating pipe will not be damaged due to expansion. But, there is following defect in this prior art scheme:

1. The technical solution is to send the clean waste hot water in the waste water mixing tank to the conventional waste water source heat pump unit to recover the waste heat and heat the cold water. Because the heat exchanger of the common waste water source heat pump unit cannot accept unclean or corrosive chemical waste It is difficult for this technical solution to meet the actual requirements for heat recovery of printing and dyeing wastewater.

2. Since the conventional primary heating heat pump water heater uses a water volume regulating valve to control the water temperature, in order to meet the water temperature requirements of the printing and dyeing production process, the water volume regulating valve must always be in a low flow state to produce high-temperature hot water, which not only leads to heat loss in the condenser The exchange effect is poor, the heating capacity and energy efficiency of the heat pump unit are severely reduced, and the water regulating valve in the low flow state has a small aperture, which is easy to cause the unit to cause abnormal water flow due to blockage and stop the unit due to failure;

3. Conventional wastewater source heat pump units need to operate in a high-load area to produce high-temperature hot water, and the product life of the heat pump unit will also be greatly affected.

Contents of the invention

The object of the present invention is to provide a control device for a printing and dyeing heat treatment machine, which is used to control the operation of the printing and dyeing heat treatment machine, to ensure that the outlet water temperature of the printing and dyeing heat treatment machine meets the requirements of the printing and dyeing process and is not affected by the influent flow rate, and solves the problem of existing printing and dyeing heat treatment machines. The above-mentioned technical problem of heat treatment machine. The technical scheme adopted in the present invention is:

A control device for a printing and dyeing heat treatment machine, used for the operation control of a printing and dyeing heat treatment machine equipped with a three-tank two-circuit circulating heat pump hot water unit, the three-water tank two-circuit circulating heat pump hot water unit includes a first circulating pump, a first circulating water tank , the second circulating water tank and the hot water storage tank, and the first solenoid valve, the second solenoid valve and the three-way valve; the waste water pool of the printing and dyeing heat treatment machine is provided with a refrigerant reheater and an inlet water preheater, and the inlet water preheater The heater is connected in series in the cold water inlet pipeline, and the refrigerant reheater is connected to the heat medium water circuit of the evaporator of the heat pump hot water unit through the second circulation pump; it is characterized in that:

The control device includes an operating parameter setting module, a water volume detection control module, a water temperature detection control module, a heat pump controller and a solenoid valve driver;

The operation parameter setting module is connected to the water volume detection control module and the water temperature detection control module, the liquid level sensor is connected to the input end of the water volume detection control module, the output end of the water volume detection control module is connected to the input end of the heat pump controller, and the heat pump control module The output end of the device is connected to the compressor of the heat pump unit, the first circulation pump and the second circulation pump; the water quantity detection control module is also connected to the solenoid valve driver through the heat pump controller;

The first water temperature sensor, the second water temperature sensor and the outlet water temperature sensor are connected to the input end of the water temperature detection control module; the output end of the water temperature detection control module is connected to the first solenoid valve, the second solenoid valve and the tee through the solenoid valve driver valve drive coil;

The water quantity detection control module detects the liquid level of the hot water storage tank, and when the liquid level is lower than the lower limit of the water level, the heat pump unit is controlled to start, and the hot water is produced from the first heating cycle; when the liquid level reaches the water level When the limit value is reached, the water quantity detection control module controls the heat pump unit to stop running, and at the same time closes the first solenoid valve and the second solenoid valve to stop water intake;

The control device of the printing and dyeing heat treatment machine continuously produces constant-temperature hot water by performing the following steps in a cycle:

S10: the water temperature detection control module detects the water temperature of the first water tank, the water temperature of the second water tank and the outlet water temperature of the three-way constant temperature hot water pipe;

S20: When the water temperature of the first water tank reaches the set water temperature, the three-way valve switches from the connection state of the a-b port to the connection state of the a-c port, and enters the operation state of the second heating cycle circuit; The constant temperature hot water that has been heated in the first circulating water tank is pushed into the hot water storage tank by the gravity of the temperature difference with the cold and hot water;

S30: When the water temperature of the second water tank reaches the set water temperature, the three-way valve switches from the connection state of the a-c port to the connection state of the a-b port, returning to the operation state of the first heating cycle; at the same time, the second solenoid valve is opened to utilize the cold water inlet pressure and the gravity of the temperature difference between cold and hot water, push the heated constant-temperature hot water in the second circulating water tank into the hot water storage tank;

S40: When the cold water entering the first circulating water tank or the second circulating water tank makes the outlet water temperature lower than the set water temperature, the water temperature detection control module controls the first solenoid valve and the second solenoid valve to close, and stops the cold water from entering.

A preferred technical solution of the printing and dyeing heat treatment machine control device of the present invention is characterized in that the first water temperature sensor and the second water temperature sensor are respectively arranged at the lower part of the first circulating water tank and the second circulating water tank; The outlet water temperature sensor is arranged at the outlet channel of the three-way constant temperature hot water pipe, and the liquid level sensor is arranged inside the hot water storage tank.

A better technical solution of the printing and dyeing heat treatment machine control device of the present invention is characterized in that a water volume regulating valve is provided on the cold water inlet pipeline at the inlet of the water inlet preheater, and the control device also includes a flow control module The waste water temperature sensor arranged in the waste water pool is connected to the input end of the flow control module; the control device obtains the waste water temperature through the waste water temperature sensor, and controls the opening degree of the water volume regulating valve according to the waste water temperature of the waste water pool, so that the incoming water The temperature difference between the outlet water temperature of the preheater and the waste water temperature is not more than 2°C, realizing turbulent heat exchange with small temperature difference.

Another object of the present invention is to provide a control method for the above-mentioned printing and dyeing heat treatment machine control device. The technical solution adopted by the present invention to solve the problems of the technologies described above is:

A control method for the above-mentioned printing and dyeing heat treatment machine control device, characterized in that it includes the following steps:

S100: Run the parameter setting module to obtain the set value of the water temperature, the upper limit value of the water level and the lower limit value of the water level;

S200: the water quantity detection control module detects the liquid level of the hot water storage tank;

S220: If the liquid level of the hot water storage tank is greater than or equal to the upper limit of the water level, close the first and second solenoid valves, stop the heat pump unit, and return to step S200; otherwise, go to step S240;

S240: If the liquid level of the hot water storage tank is lower than the lower limit of the water level, the heat pump unit is started, and the three-way valve is switched to a connection state of ports a-b; go to step S300;

S300: the water temperature detection control module detects the water temperature of the first water tank, the water temperature of the second water tank and the outlet water temperature of the three-way constant temperature hot water pipe;

S320: If the outlet water temperature is lower than the set water temperature, the first solenoid valve and the second solenoid valve are closed to stop cold water from entering;

S340: If the water temperature of the first water tank > the set water temperature, the three-way valve is switched to the a-c port connection state, the first solenoid valve is opened, and then go to step S200; otherwise, go to step S360;

S360: If the water temperature of the second water tank is greater than the set water temperature, the three-way valve is switched to the a-b connection state, the second solenoid valve is turned on, and then go to step S200; otherwise, go to step S300.

The beneficial effects of the present invention are:

1. The printing and dyeing heat treatment machine and its control method of the present invention use a Teflon capillary radiation heat exchanger as a refrigerant reheater and an inlet water preheater for absorbing the waste heat of printing and dyeing wastewater, and use a three-water tank two-way circulation heat pump with temperature control switching The hot water unit produces hot water, using R134a environmentally friendly refrigerant, which can ensure that the outlet water temperature reaches any set temperature below 85°C, and is not affected by the inflow flow, ensuring the stability and continuity of the hot water used in the printing and dyeing production process sex.

2. In the printing and dyeing heat treatment machine and its control method of the present invention, the opening of the water volume regulating valve is controlled according to the temperature of the wastewater, and the outlet water temperature of the inlet water preheater is made close to the temperature of the wastewater by adjusting the inlet water flow rate, so as to realize turbulent flow heat transfer with small temperature difference , which can not only ensure that the tap water can fully recover the primary heat, but also improve the heat exchange effect of the condenser.

3. The printing and dyeing heat treatment machine and its control method of the present invention use the waste heat of printing and dyeing wastewater to produce hot water required for the production process, which can reduce the temperature of wastewater, reduce waste heat pollution, omit the power consumption of cooling towers and wastewater cooling booster pumps, and save operation It is beneficial to protect human life and ecological environment. The equipment failure rate is reduced, the system is stable, the structure is simple, and the application and promotion are strong.

Description of drawings

Fig. 1 is the schematic diagram of waste heat treatment flow chart of existing printing and dyeing process;

Fig. 2 is a structural schematic diagram of a printing and dyeing heat treatment machine equipped with a three-water tank two-circuit circulating heat pump hot water unit;

Fig. 3 is the schematic diagram of the printing and dyeing heat treatment machine control device of the present invention;

Fig. 4 is a flow chart of the control method of the printing and dyeing heat treatment machine control device of the present invention.

The labels of the components in the above figure: 10-printing and dyeing production equipment (dye vat), 11-softening water pool, 12-cooling pool, 13-biochemical treatment pool, 1-compressor, 2-evaporator, 20-wastewater pool, 21 -refrigerant reheater, 22-inlet water preheater, 3-condenser, 30-water volume regulating valve, 31-first solenoid valve, 32-second solenoid valve, 33-three-way valve, 4-first cycle Pump, 40-hot water storage tank, 41-first circulating water tank, 42-second circulating water tank, 43-three-way constant temperature hot water pipe, 5-throttling element, 51-liquid storage tank, 52-filter, 6 -gas-liquid separator, 7-second circulation pump, 8-control device, 80-liquid level sensor, 81-first water temperature sensor, 82-second water temperature sensor, 83-outlet water temperature sensor, 84-waste water temperature sensor, 800-operation parameter setting module, 810-water volume detection control module, 820-water temperature detection control module, 830-heat pump controller, 840-solenoid valve driver, 850-flow control module.

Detailed ways

In order to better understand the above technical solutions of the present invention, a further detailed description will be given below in conjunction with the drawings and embodiments. Fig. 2 is an embodiment of the printing and dyeing heat treatment machine of the present invention, including a heat pump unit composed of a compressor 1, an evaporator 2, a condenser 3, a throttling element 5 and a gas-liquid separator 6 connected to each other, and the water circuit of the condenser 3 The first circulation pump 4 and the hot water storage tank 40, the waste water pool 20 for storing the wastewater discharged from the printing and dyeing process, and the control device 8 for controlling the operation of the heat pump water heater;

As shown in Figure 2, the described hot water storage tank 40 is connected to the first circulating water tank 41 and the second circulating water tank 42 through a three-way constant temperature hot water pipe 43, and the first electromagnetic valve 31, the second electromagnetic valve The connection control of 32 and three-way valve 33 constitutes a three-tank two-way circulating heat pump water heater unit with temperature control switching according to the following connection mode:

The circulating water inlet at the top of the first circulating water tank 41 and the second circulating water tank 42 is connected in parallel to the water outlet of the condenser 3; the circulating water outlet at the bottom of the first circulating water tank 41 and the second circulating water tank 42 is respectively connected to the three-way valve 33 Port b and port c, and port a of the three-way valve 33 are connected to the water inlet of the condenser 3 through the first circulation pump 4, forming the first heating cycle loop and the second heating cycle loop controlled by the three-way valve 33, wherein:

The first heating cycle: condenser -> first circulating water tank -> three-way valve b port -> three-way valve a port -> first circulating pump -> condenser;

The second heating cycle: condenser -> second circulating water tank -> three-way valve c port -> three-way valve a port -> first circulating pump -> condenser;

The cold water inlet at the bottom of the first circulating water tank 41 and the second circulating water tank 42 is connected to the cold water inlet pipeline by the first electromagnetic valve 31 and the second electromagnetic valve 32 respectively; The hot water outlet is connected to the hot water storage tank 40 through a three-way constant temperature hot water pipe 43, forming the first constant temperature water outlet channel and the second constant temperature water outlet channel controlled by the first solenoid valve 31 and the second solenoid valve 32, wherein:

The first constant temperature water outlet channel: cold water inlet -> first solenoid valve -> first circulating water tank -> three-way constant temperature hot water pipe -> hot water storage tank;

The second constant temperature water outlet channel: cold water inlet -> second solenoid valve -> second circulating water tank -> three-way constant temperature hot water pipe -> hot water storage tank;

The waste water pool 20 is provided with a refrigerant reheater 21 and an inlet water preheater 22 for absorbing the waste heat of waste water; the water inlet and outlet of the refrigerant reheater 21 are connected to the evaporator through the second circulating pump 7 The heat medium waterway of 2 uses the waste heat of waste water absorbed by the heat medium water to reheat and evaporate the refrigerant in the evaporator 2; the inlet water preheater 22 is connected in series at the inlet of the first solenoid valve 31 and the second solenoid valve 32 In the cold water inlet pipeline, the waste water waste heat is used to preheat the cold water entering the three-tank two-way circulating heat pump hot water unit; the waste heat of the printing and dyeing waste water is transferred to the refrigerant in the evaporator 2 through the heat medium water, and then the refrigerant in the heat pump unit is used Circulation and the hot water circulation of the three-water-tank two-circuit circulation heat pump hot water unit are transferred to the high-temperature hot water produced by the heat pump unit to realize the recycling of waste heat from printing and dyeing production wastewater; the cold water entering the preheater 22 can be tap water or It is the softened cold water used by the printing and dyeing production equipment 10, as shown in Fig. 1 and Fig. 2 .

The printing and dyeing heat treatment machine continuously produces constant temperature hot water by performing the following steps in a cycle:

S1: When the water in the first circulating water tank 41 is heated to the set water temperature Tsd in the first heating cycle loop, the control device 8 switches the circulating water flow to the second heating by controlling the conduction state of the three-way valve 33 Circulation circuit, open the first solenoid valve 31 at the same time, and transport the hot water in the first circulating water tank 41 to the hot water storage tank 40 through the first constant temperature water outlet channel;

S2: When the water in the second circulating water tank 42 is heated to the set water temperature Tsd in the second heating cycle loop, the control device 8 switches the circulating water flow to the first heating by controlling the conduction state of the three-way valve 33 Circulation loop, open the second solenoid valve 32 at the same time, and transport the hot water in the second circulating water tank 42 to the hot water storage tank 40 through the second constant temperature outlet channel;

S3: When the outlet water temperature Tcs flowing through the three-way constant temperature hot water pipe 43 is lower than the set water temperature Tsd, the control device 8 controls to close the first solenoid valve 31 or the second solenoid valve 32 that is in the open state, preventing uncontrolled The water reaching the set water temperature Tsd flows into the hot water storage tank 40, thereby ensuring that the water temperature in the hot water storage tank 40 remains constant.

In the embodiment of the printing and dyeing heat treatment machine of the present invention shown in Fig. 2, at the bottom of the first circulating water tank 41 and the second circulating water tank 42, the first water temperature sensor 81 and the second water temperature sensor 82 are arranged respectively; The outlet channel of the hot water pipe 43 is provided with an outlet water temperature sensor 83, and a liquid level sensor 80 is provided inside the hot water storage tank 40; the control device 8 is connected to the liquid level sensor 80, and according to the liquid level Wyw controls the start or stop of the heat pump unit; the control device 8 is connected to the first water temperature sensor 81, the second water temperature sensor 82 and the outlet water temperature sensor 83, and controls the first electromagnetic valve 31 and the second electromagnetic valve according to the water temperature of the water tank and the outlet water temperature. The valve 32 and the three-way valve 33 are a three-tank two-way circulation heat pump water heater unit that realizes temperature control switching.

In the embodiment of the printing and dyeing heat treatment machine of the present invention shown in Figure 2, a waste water temperature sensor 84 is provided in the waste water pool 20, and a water volume adjustment is provided on the cold water inlet pipeline at the inlet of the water inlet preheater 22. Valve 30, the control device 8 obtains the waste water temperature through the waste water temperature sensor 84, controls the water volume according to the waste water temperature of the waste water pool 20, and adjusts the inflow flow so that the temperature difference between the water outflow temperature of the inflow preheater and the waste water temperature is not greater than 2°C , to achieve small temperature difference turbulent heat transfer. Since the circulating water flow of the heat pump unit does not directly pass through the hot water storage tank 40, the printing and dyeing heat treatment machine of the present invention can ensure that the outlet water temperature reaches various required temperatures below 85 degrees, and the temperature of the wastewater and the opening of the water volume regulating valve 30 will not affect the outlet water temperature. .

In the embodiment of the printing and dyeing heat treatment machine of the present invention shown in FIG. 2 , the throttling element 5 is an electronic expansion valve, and the refrigerant from the high-pressure side of the compressor 1 passes through the refrigerant pipe of the condenser 3 in sequence. circuit, liquid storage tank 51, filter 52 and gas-liquid separator 6 return to the low-pressure side of compressor 1 to form a refrigerant circulation loop; the control device 8 regulates the circulation amount of refrigerant by controlling the opening of the electronic expansion valve .

According to an embodiment of the printing and dyeing heat treatment machine of the present invention, the first circulating water tank 41 and the second circulating water tank 42 are two water tanks with the same capacity, and their capacity is 1/4 to 1 /8, in this embodiment, the capacity of the first circulating water tank 41 and the second circulating water tank 42 is 1/6 of the heating water per hour under the nominal working condition; the capacity of the hot water storage tank 40 is greater than the peak hot water per hour The difference between the demand and the heating water per hour under nominal conditions to ensure that sufficient hot water can be continuously provided during the peak water consumption period.

According to an embodiment of the printing and dyeing heat treatment machine of the present invention, the refrigerant reheater 21 and the inlet water preheater 22 are Teflon capillary radiation heat exchangers, and each capillary radiation heat exchanger includes at least one set of Teflon Dragon tube bundle; the Teflon tube bundle is composed of a plurality of Teflon capillaries connected in parallel, and the two ends of the Teflon capillary are respectively connected in parallel to form the water inlet and the water outlet of the heat exchanger; the Teflon The tube bundle is coiled and immersed in the waste water pool 20, and the clean water flowing through the capillary through the water inlet and water outlet absorbs the heat of the waste water from the waste water pool 20 through the capillary tube wall; the outer diameter of a single Teflon capillary tube is ≤6mm, and the capillary wall The thickness is 0.3-0.6mm. The number of Teflon capillary tubes and the length of the single-path process depend on the flow rate and heat transfer area required by the capillary radiation heat exchanger. According to a preferred embodiment of the present invention, the outer diameter of a single Teflon capillary is 5.72 mm, the thickness is 0.5 mm, and the length of a single-path flow is 25 meters. Due to the high chemical stability and excellent aging resistance of Teflon material, it can withstand all strong acids, including aqua regia, hydrofluoric acid, concentrated hydrochloric acid, nitric acid, oleum, organic acids, etc., strong alkalis, strong oxidants , reducing agent and various organic solvents, and Teflon material has a very low friction coefficient, the surface is not easy to absorb pollutants, which can ensure the heat exchange effect. Therefore, the Teflon capillary radiation heat exchanger is very suitable for long-term placement in high-temperature and high-corrosion printing and dyeing waste liquid, as a heat exchanger for absorbing the waste heat of printing and dyeing wastewater.

An embodiment of the control device 8 of the printing and dyeing heat treatment machine of the present invention is shown in Figure 3, including an operating parameter setting module 800, a water volume detection control module 810, a water temperature detection control module 820, a heat pump controller 830 and a solenoid valve driver 840;

The operating parameter setting module 800 is connected to the water volume detection control module 810 and the water temperature detection control module 820;

The liquid level sensor 80 is connected to the input end of the water volume detection control module 810, the output end of the water volume detection control module 810 is connected to the input end of the heat pump controller 830, and the output end of the heat pump controller 830 is connected to the compressor 1, the first circulating pump 4 and the motor of the first circulation pump 7; the water volume detection control module 810 is also connected to the solenoid valve driver 840 through the heat pump controller 830;

The first water temperature sensor 81, the second water temperature sensor 82 and the outlet water temperature sensor 83 are connected to the input end of the water temperature detection control module 820; the output end of the water temperature detection control module 820 is connected to the first electromagnetic valve 31, The drive coils of the second solenoid valve 32 and the three-way valve 33;

The water quantity detection control module 810 detects the liquid level Wyw of the hot water storage tank 40, and when the liquid level Wyw is lower than the lower limit value Wxx of the water level, the heat pump unit is controlled to start, and hot water is produced from the first heating cycle; When the liquid level Wyw reaches the water level upper limit Wsx, the water volume detection control module 810 controls the heat pump unit to stop running, and at the same time closes the first solenoid valve 31 and the second solenoid valve 32 to stop water intake;

The control device of the printing and dyeing heat treatment machine continuously produces constant-temperature hot water by performing the following steps in a cycle:

S10: The water temperature detection control module 820 detects the water temperature Ts1 of the first water tank, the water temperature Ts2 of the second water tank, and the water outlet temperature Tcs of the three-way constant temperature hot water pipe;

S20: When the water temperature Ts1 of the first water tank reaches the set water temperature Tsd, the three-way valve 33 switches from the connection state of the a-b port to the connection state of the a-c port, and enters the operation state of the second heating cycle; at the same time, the first solenoid valve 31 is opened, and the The pressure of cold water inlet and the temperature difference between cold and hot water are used to push the heated constant-temperature hot water in the first circulating water tank 41 into the hot water storage tank 40;

S30: When the water temperature Ts2 of the second water tank reaches the set water temperature Tsd, the three-way valve 33 switches from the connection state of the a-c port to the connection state of the a-b port, and returns to the operation state of the first heating cycle circuit; at the same time, the second electromagnetic valve 32 is opened, using The pressure of cold water inlet and the temperature difference between cold and hot water are used to push the heated constant-temperature hot water in the second circulating water tank 42 into the hot water storage tank 40;

S40: When the cold water entering the first circulating water tank 41 or the second circulating water tank 42 makes the outlet water temperature Tcs lower than the set water temperature Tsd, the water temperature detection control module 820 controls the first solenoid valve 31 and the second solenoid valve 32 to close, and stops the cold water from entering. water.

In the embodiment of the control device of the printing and dyeing heat treatment machine shown in Figure 3, the cold water inlet pipeline at the inlet of the water inlet preheater 22 is provided with a water volume regulating valve 30, and the control device 8 also includes a flow control module 850; the waste water temperature sensor 84 arranged in the waste water pool 20 is connected to the input end of the flow control module 850; the control device 8 obtains the waste water temperature through the waste water temperature sensor 84, and controls the adjustment of the water volume according to the waste water temperature of the waste water pool 20 The opening of the valve 30 is such that the temperature difference between the outlet water temperature of the inlet water preheater and the waste water temperature is not greater than 2°C, realizing turbulent heat exchange with a small temperature difference.

Fig. 4 is the embodiment of the flow chart of the control method of the printing and dyeing heat treatment machine control device of the present invention, the control device is controlled by a single-chip microprocessor, and its control process includes the following steps:

S100: Run the parameter setting module to obtain the set value of water temperature Tsd, the upper limit of water level Wsx and the lower limit of water level Wxx;

S200: the water quantity detection control module detects the liquid level Wyw of the hot water storage tank;

S220: If the liquid level Wyw of the hot water storage tank ≥ the water level upper limit Wsx, close the first and second solenoid valves, stop the heat pump unit, stop the compressor, the first circulation pump and the second circulation pump, and return to step S200; otherwise, Go to step S240;

S240: If the liquid level of the hot water storage tank Wyw<the lower limit of the water level Wxx, the heat pump unit starts, the compressor, the first circulation pump and the second circulation pump start to run, and the three-way valve is switched to a connection state of ports a-b; go to step S300;

S300: The water temperature detection control module detects the water temperature Ts1 of the first water tank, the water temperature Ts2 of the second water tank and the water outlet temperature Tcs of the three-way constant temperature hot water pipe;

S320: If the water outlet temperature Tcs<set water temperature Tsd, the water temperature detection control module closes the first solenoid valve and the second solenoid valve, and stops the cold water from entering; according to a preferred embodiment of the printing and dyeing heat treatment machine control method of the present invention, in order to increase the temperature For control stability, the control device 8 closes the first solenoid valve and the second solenoid valve when the outlet water temperature Tcs is 1°C lower than the set water temperature Tsd.

S340: If the water temperature Tc1 of the first water tank>the set water temperature Tsd, the water temperature detection control module controls the three-way valve to switch to the a-c port connection state, the first solenoid valve is opened, and then go to step S200; otherwise, go to step S360;

S360: If the water temperature Tc2 of the second water tank>the set water temperature Tsd, the water temperature detection control module controls the three-way valve to switch to the a-b port connection state, the second solenoid valve is turned on, and then go to step S200; otherwise, go to step S300.

Those of ordinary skill in the technical field should recognize that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not used as limitations to the present invention. All changes and modifications will fall within the protection scope of the claims of the present invention.

Claims (3)

1. A printing and dyeing heat treatment machine control device, used for the operation control of a printing and dyeing heat treatment machine equipped with a three-water tank two-circuit circulating heat pump hot water unit, the three-water tank two-circuit circulating heat pump hot water unit includes a first circulating pump, a first Circulating water tank, the second circulating water tank and the hot water storage tank, and the first electromagnetic valve, the second electromagnetic valve and the three-way valve; the waste water pool of the printing and dyeing heat treatment machine is provided with a refrigerant reheater and an inlet water preheater for further The water preheater is connected in series in the cold water inlet pipeline, and the refrigerant reheater is connected to the heat medium water circuit of the evaporator of the heat pump hot water unit through the second circulation pump; it is characterized in that: The control device includes an operating parameter setting module, a water volume detection control module, a water temperature detection control module, a flow control module, a heat pump controller and a solenoid valve driver; The operation parameter setting module is connected to the water volume detection control module and the water temperature detection control module, the liquid level sensor is connected to the input end of the water volume detection control module, the output end of the water volume detection control module is connected to the input end of the heat pump controller, and the heat pump control module The output end of the device is connected to the compressor of the heat pump unit, the first circulation pump and the second circulation pump; the water quantity detection control module is also connected to the solenoid valve driver through the heat pump controller; The first water temperature sensor, the second water temperature sensor and the outlet water temperature sensor are connected to the input end of the water temperature detection control module; the output end of the water temperature detection control module is connected to the first solenoid valve, the second solenoid valve and the tee through the solenoid valve driver valve drive coil; The water quantity detection control module detects the liquid level of the hot water storage tank, and when the liquid level is lower than the lower limit of the water level, the heat pump unit is controlled to start, and the hot water is produced from the first heating cycle; when the liquid level reaches the water level When the limit value is reached, the water quantity detection control module controls the heat pump unit to stop running, and at the same time closes the first solenoid valve and the second solenoid valve to stop water intake; The cold water inlet pipeline at the inlet of the water inlet preheater is provided with a water volume regulating valve; the wastewater temperature sensor arranged in the wastewater pool is connected to the input end of the flow control module; the control device obtains the wastewater temperature through the wastewater temperature sensor , according to the wastewater temperature in the wastewater tank, control the opening of the water volume regulating valve, so that the temperature difference between the outlet water temperature of the inlet water preheater and the wastewater temperature is not greater than 2°C, and realize small temperature difference turbulent heat exchange; The control device of the printing and dyeing heat treatment machine continuously produces constant-temperature hot water by performing the following steps in a cycle: S10: the water temperature detection control module detects the water temperature of the first water tank, the water temperature of the second water tank and the outlet water temperature of the three-way constant temperature hot water pipe; S20: When the water temperature of the first water tank reaches the set water temperature, the three-way valve switches from the connection state of the a-b port to the connection state of the a-c port, and enters the operation state of the second heating cycle circuit; The constant temperature hot water that has been heated in the first circulating water tank is pushed into the hot water storage tank by the gravity of the temperature difference with the cold and hot water; S30: When the water temperature of the second water tank reaches the set water temperature, the three-way valve switches from the connection state of the a-c port to the connection state of the a-b port, returning to the operation state of the first heating cycle; at the same time, the second solenoid valve is opened to utilize the cold water inlet pressure and the gravity of the temperature difference between cold and hot water, push the heated constant-temperature hot water in the second circulating water tank into the hot water storage tank; S40: When the cold water entering the first circulating water tank or the second circulating water tank makes the outlet water temperature lower than the set water temperature, the water temperature detection control module controls the first solenoid valve and the second solenoid valve to close, and stops the cold water from entering. 2. The printing and dyeing heat treatment machine control device according to claim 1, characterized in that the first water temperature sensor and the second water temperature sensor are respectively arranged at the bottom of the first circulating water tank and the second circulating water tank; The temperature sensor is arranged at the outlet channel of the three-way constant temperature hot water pipe, and the liquid level sensor is arranged inside the hot water storage tank. 3. A control method for the printing and dyeing heat treatment machine control device according to claim 1 or 2, characterized in that it comprises the following steps: S100: Run the parameter setting module to obtain the set value of the water temperature, the upper limit value of the water level and the lower limit value of the water level; S200: the water quantity detection control module detects the liquid level of the hot water storage tank; S220: If the liquid level of the hot water storage tank is greater than or equal to the upper limit of the water level, close the first and second solenoid valves, stop the heat pump unit, and return to step S200; otherwise, go to step S240; S240: If the liquid level of the hot water storage tank is lower than the lower limit of the water level, the heat pump unit is started, and the three-way valve is switched to a connection state of ports a-b; go to step S300; S300: the water temperature detection control module detects the water temperature of the first water tank, the water temperature of the second water tank and the outlet water temperature of the three-way constant temperature hot water pipe; S320: If the outlet water temperature is lower than the set water temperature, the first solenoid valve and the second solenoid valve are closed to stop cold water from entering; S340: If the water temperature of the first water tank > the set water temperature, the three-way valve is switched to the a-c port connection state, the first solenoid valve is opened, and then go to step S200; otherwise, go to step S360; S360: If the water temperature of the second water tank is greater than the set water temperature, the three-way valve is switched to the a-b connection state, the second solenoid valve is turned on, and then go to step S200; otherwise, go to step S300.