Constant temperature adjusting device for controlling steam heating water tank through electric adjusting valve

Abstract

The utility model discloses a constant temperature adjusting device for controlling a steam heating water tank by using an electric adjusting valve, which comprises a main power supply, at least one hot water circulation circuit, a switching power supply, a programmable logic controller, a temperature sensor for sensing the temperature in the water tank, and the electric adjusting valve arranged on a pipeline, the switching power supply is electrically connected with the main power supply, the programmable logic controller is electrically connected with the switching power supply, the temperature sensor is electrically connected with the programmable logic controller, a heat exchanger is arranged in the water tank, the pipeline is communicated with the heat exchanger, and the programmable logic controller comprises a basic module and an analog quantity module. The analog quantity module is electrically connected with the electric control valve to control the opening degree of the electric control valve. According to the device, the amount of steam entering the water tank heat exchanger is controlled by adjusting the opening degree of the electric adjusting valve, water temperature adjustment is achieved, the using amount of boiler fuel is reduced, the fuel is saved, and safety is good.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical automation control, in particular to a constant temperature regulating device for controlling a steam heating water tank by using an electric regulating valve. Background Art

[0002] The existing water tank uses a temperature control instrument to control the steam pipeline solenoid valve. When the water tank temperature is lower than the lower limit temperature set by the instrument, the steam pipeline solenoid valve opens, and steam enters the heat exchanger of the water tank to heat the water tank. When the water tank temperature reaches the upper limit temperature set by the instrument, the pipeline solenoid valve closes and the steam stops entering the heat exchanger. The original pipeline solenoid valve only has two actions: open and close. In actual use, the solenoid valve is frequently switched on and off according to the changes in the water tank temperature and is easily damaged. Once damaged, it cannot be discovered in time. When the water tank temperature reaches the set temperature, the solenoid valve does not close, causing steam to continuously heat the water tank. The hot water temperature in the water tank is too high. The PPR hot water pipes in the dormitory building are aged rapidly under high temperature for a long time, and pipe bursts have occurred many times, causing burns and property losses, while wasting fuel and increasing fuel costs. Therefore, a new technical solution is urgently needed to solve at least one of the above technical problems. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the purpose of the utility model is to provide a thermostatic regulating device for controlling a steam heating water tank with an electric regulating valve, replacing the existing solenoid valve with an electric regulating valve controlled by a programmable logic controller in a closed loop, and controlling the amount of steam entering the water tank heat exchanger by adjusting the opening of the electric regulating valve to achieve water temperature regulation, reduce boiler fuel usage, save fuel, and have good safety.

[0004] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is:

[0005] A thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve, characterized in that it comprises:

[0006] Main power supply;

[0007] at least one hot water circulation circuit, the hot water circulation circuit being electrically connected to the main power supply;

[0008] A switching power supply, the switching power supply is electrically connected to the main power supply;

[0009] A programmable logic controller, the programmable logic controller is electrically connected to the switching power supply;

[0010] A temperature sensor for sensing the temperature in the water tank, wherein the temperature sensor is electrically connected to the programmable logic controller;

[0011] An electric regulating valve is arranged on a pipeline, a heat exchanger is arranged in the water tank, the pipeline is connected with the heat exchanger, the programmable logic controller includes a basic module and an analog module, and the analog module is electrically connected with the electric regulating valve to control the opening of the electric regulating valve.

[0012] As a preferred technical solution, a transmitter is arranged between the temperature sensor and the analog module, the temperature sensor is electrically connected to the terminals 0+ and 0- of the analog module through the transmitter, and the electric control valve is electrically connected to the terminals 1+ and 1- of the analog module.

[0013] As a preferred technical solution, the number of the hot water circulation circuits is two, namely a first hot water circulation circuit and a second hot water circulation circuit, and the first hot water circulation circuit and the second hot water circulation circuit are arranged in parallel.

[0014] As a preferred technical solution, the first hot water circulation circuit includes a first circuit breaker, a switch KM1, a first thermal relay and a first hot water circulation pump which are electrically connected in sequence, and the first circuit breaker is electrically connected to the main power supply. The second hot water circulation circuit includes a second circuit breaker, a switch KM2, a second thermal relay and a second hot water circulation pump which are electrically connected in sequence, and the second circuit breaker is electrically connected to the main power supply. The basic module is electrically connected to the first thermal relay and the second thermal relay respectively.

[0015] As a preferred technical solution, a high temperature protection solenoid valve is provided on the pipeline, the high temperature protection solenoid valve is electrically connected to the main power supply, and the high temperature protection solenoid valve is located upstream of the electric regulating valve.

[0016] As a preferred technical solution, the high temperature protection solenoid valve is electrically connected to the basic module.

[0017] As a preferred technical solution, a third circuit breaker is electrically connected between the switching power supply and the main power supply, and a fourth circuit breaker is electrically connected to the 24V terminal of the switching power supply.

[0018] As a preferred technical solution, a fifth circuit breaker is electrically connected between the electric regulating valve and the main power supply.

[0019] As a preferred technical solution, a sixth circuit breaker is electrically connected between the high temperature protection solenoid valve and the main power supply.

[0020] As a preferred technical solution, the temperature sensor is arranged at the upper 1 / 3 of the water tank.

[0021] Compared with the traditional technical solution, the beneficial effects of the utility model are:

[0022] 1) The water temperature of the water tanks on the roofs of each building can be monitored online in real time in the boiler room, reducing the number of inspections by personnel on the roofs. At the same time, when the water temperature reaches the set value, the use of boiler fuel can be reduced, saving fuel. An electric regulating valve with closed-loop feedback is used to control the opening to control the steam volume of the heat exchanger. The water temperature of the water tank can be accurately controlled, the use of boiler fuel can be reduced, fuel can be saved, and safety is good;

[0023] 2) Set up two hot water circulation circuits and implement timing control on the hot water circulation pump to reduce unnecessary heat loss in the hot water pipes and save electricity costs;

[0024] 3) The high temperature protection solenoid valve can play a role in high temperature protection. When the water temperature exceeds the set value, the steam is cut off, and together with the electric regulating valve, the purpose of double protection is achieved;

[0025] 4) Multiple circuit breakers improve the safety of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A main circuit diagram of a device provided for one embodiment of the utility model;

[0027] Figure 2 A control circuit diagram of a device provided by an embodiment of the utility model;

[0028] Figure 3 A programmable logic controller wiring diagram of a device provided by one embodiment of the utility model;

[0029] Figure 4 An installation diagram of an electric regulating valve of a model provided for an embodiment of the utility model.

[0030] exist Figure 1-Figure 4 Among them, 1. main power supply; 2. switching power supply; 3. programmable logic controller; 301. basic module; 302. analog module; 4. electric control valve; 5. temperature sensor; 6. high temperature protection solenoid valve; 7. first circuit breaker; 8. first thermal relay; 9. first hot water circulation pump; 10. second circuit breaker; 11. second thermal relay; 12. second hot water circulation pump; 13. third circuit breaker; 14. fourth circuit breaker; 15. fifth circuit breaker; 16. sixth circuit breaker; 17. transmitter; 18. water tank; 19. heat exchanger. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "top", "bottom", "left", "right", "front", "back", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] Please refer to Figure 1-Figure 4 An embodiment of the utility model provides a thermostatic regulating device for controlling a steam heating water tank with an electric regulating valve, comprising a main power supply 1, at least one hot water circulation circuit, a switching power supply 2, a programmable logic controller 3, a temperature sensor 5 for sensing the temperature in a water tank 18, and an electric regulating valve 4 arranged in a pipeline. The wiring terminals of the main power supply 1 include PE, L1, L2, L3 and N. The hot water circulation circuit is electrically connected to the main power supply 1, the switching power supply 2 is electrically connected to the main power supply 1, the programmable logic controller 3 is electrically connected to the switching power supply 2, the temperature sensor 5 is electrically connected to the programmable logic controller 3, a heat exchanger 19 is arranged in the water tank 18, and the pipeline is connected to the heat exchanger 19. The programmable logic controller 3 includes a basic module 301 and an analog module 302. The output wiring terminals of the basic module 301 include Q0.0, Q0.1 and Q0.2. The analog module 302 is electrically connected to the electric regulating valve 4 to control the opening of the electric regulating valve 4.

[0034] The device of the utility model realizes online real-time monitoring of the water temperature of the water tank 18 on the roof of each building in the boiler room, reducing the number of times personnel go to the roof for inspection. At the same time, after the water temperature reaches the set value, the use of boiler fuel can be reduced, saving fuel. An electric regulating valve 4 with closed-loop feedback is used to control the opening to control the steam volume of the heat exchanger 19, which can accurately control the water temperature of the water tank 18, reduce the use of boiler fuel, save fuel, and has good safety.

[0035] like Figure 3As shown, a transmitter 17 is provided between the temperature sensor 5 and the analog module 302. Specifically, the temperature sensor 5 is provided at the upper 1 / 3 of the water tank 18. The temperature sensor 5 is electrically connected to the connection terminals 0+ and 0- of the analog module 302 through the transmitter 17. The electric regulating valve 4 is electrically connected to the 1+ and 1- of the analog module 302. The signal of the temperature sensor 5 is converted into an analog current signal recognizable by the analog module 302 through the transmitter 17, and connected to 0+ and 0- of the analog module 302. In this way, the temperature of the water tank 18 can be monitored in real time, and control instructions can be issued according to the temperature of the water tank 18.

[0036] like Figure 1-Figure 3 As shown, the number of the hot water circulation circuits is 2, namely, a first hot water circulation circuit and a second hot water circulation circuit, the first hot water circulation circuit and the second hot water circulation circuit are arranged in parallel, further, the first hot water circulation circuit includes a first circuit breaker 7, a switch KM1, a first thermal relay 8 and a first hot water circulation pump 9 which are electrically connected in sequence, the first circuit breaker 7 is electrically connected to the main power supply 1, the second hot water circulation circuit includes a second circuit breaker 10, a switch KM2, a second thermal relay 11 and a second hot water circulation pump 12 which are electrically connected in sequence, the second circuit breaker 10 is electrically connected to the main power supply 1 The basic module 301 is electrically connected to the first thermal relay 8 and the second thermal relay 11 respectively, the first circuit breaker 7 is electrically connected to L1, L2, and L3 respectively, the second circuit breaker 10 is electrically connected to L1, L2, and L3 respectively, Q0.0 of the basic module 301 is electrically connected to the first thermal relay 8 to control the operation of the first hot water circulation pump 9, and Q0.1 of the basic module 301 is electrically connected to the second thermal relay 11 to control the operation of the second hot water circulation pump 12. The first hot water circulation pump 9 and the second hot water circulation pump 12 are subject to timing control to reduce unnecessary heat loss of the hot water pipe and save electricity.

[0037] like Figure 1-Figure 4 As shown, a high-temperature protection solenoid valve 6 is provided on the pipeline, and the high-temperature protection solenoid valve 6 is electrically connected to the main power supply 1. The high-temperature protection solenoid valve 6 is located upstream of the electric control valve 4. Further, the high-temperature protection solenoid valve 6 is electrically connected to the basic module 301, that is, Q0.2 of the basic module 301 is electrically connected to the high-temperature protection solenoid valve 6 to control the switch of the high-temperature protection solenoid valve 6. The high-temperature protection solenoid valve 6 can play a high-temperature protection role. When the water temperature exceeds the set value, the steam is cut off, and the purpose of double protection is achieved together with the electric control valve 4.

[0038] like Figure 1As shown, the main power supply 1 is electrically connected to a main fuse, a third circuit breaker 13 is electrically connected between the switching power supply 2 and the main power supply 1, a fourth circuit breaker 14 is electrically connected to the 24V terminal of the switching power supply 2, and the third circuit breaker 13 is electrically connected to L3 and N respectively, thereby improving safety in use.

[0039] like Figure 1 As shown, a fifth circuit breaker 15 is electrically connected between the electric regulating valve 4 and the main power supply 1, and the fifth circuit breaker 15 is electrically connected to L3 and N respectively, thereby improving the safety of use.

[0040] like Figure 1 As shown, a sixth circuit breaker 16 is electrically connected between the high temperature protection solenoid valve 6 and the main power supply 1, a switch KA3 is arranged between the connection terminal L of the high temperature protection solenoid valve 6 and the sixth circuit breaker 16, and the sixth circuit breaker 16 is electrically connected to L1 and N respectively, so as to improve the safety of use.

[0041] The working principle of the utility model is as follows:

[0042] In the main circuit diagram, L1, L2, and L3 supply power to subsequent circuits through the main fuse, and the main fuse has short-circuit and overcurrent protection functions.

[0043] First hot water circulation pump 9 start and stop control instructions: Figure 1 In the process, the first circuit breaker 7 is closed, and in manual operation, Figure 2 The S5 switch in the relay is turned to manual mode, and the manual start button S1 is pressed. The coil of relay KA1 is energized, and the normally open contacts of KA1 are closed and self-locked. After S1 is released, the coil of KA1 is always energized, and the two normally open contacts 1 and 9 of KA1 are closed, and the coil of KM1 is energized. Figure 1 The main contact of KM1 in the circuit is closed, and the first hot water circulation pump 9 is powered on after passing through the first thermal relay 8. When the manual stop button S2 is pressed or the first thermal relay 8 is protected, the KA1 coil loses power, the KA1 normally open contact is disconnected, the contactor KM1 coil loses power, the KM1 main contact is disconnected, and the first hot water circulation pump 9 stops. During automatic operation, the S5 switch is turned to automatic, and the Q0.0 of the basic module 301 gives a signal to KA1. When Q0.0 continuously outputs +24V, the KA1 coil is energized, and the two normally open contacts 1 and 9 of KA1 are closed (see Figure 2 ), the coil of KM1 is energized, Figure 1 The main contact of KM1 is closed, and the first hot water circulation pump 9 is energized after passing through the first thermal relay 8. When Q0.0 stops outputting +24V, the KA1 coil loses power, the KA1 normally open contact is disconnected, the contactor KM1 coil loses power, the KM1 main contact is disconnected, and the first hot water circulation pump 9 stops.

[0044] Description of the start and stop control of the second hot water circulation pump 12: Figure 1In the process, the second circuit breaker 10 is closed, and in manual operation, Figure 2 The S6 switch in the relay is turned to manual mode, and the manual start button S4 is pressed. The coil of relay KA2 is energized, and the normally open contact of KA2 closes and self-locks. After releasing the S4 button, the coil of KA2 is always energized, and the two normally open contacts 1 and 9 of KA2 are closed, and the coil of KM2 is energized. Figure 1 The main contact of KM2 in the circuit is closed, and the second hot water circulation pump 12 is powered on after passing through the second thermal relay 11. When the S3 manual stop button is pressed or the second thermal relay 11 is protected, the KA2 coil loses power, the KA2 normally open contact is disconnected, the contactor KM2 coil loses power, the KM2 main contact is disconnected, and the second hot water circulation pump 12 stops. When the S6 switch is turned to automatic, the Q0.1 of the basic module 301 sends a signal to KA2. When Q0.1 continuously outputs +24V, the KA2 coil is energized, the two normally open contacts 1 and 9 of KA2 are closed, and the KM2 coil is energized. Figure 1 The main contact of KM2 is closed, and the second hot water circulation pump 12 is energized after passing through the second thermal relay 11. When Q0.1 stops outputting +24V, the KA2 coil loses power, the KA2 normally open contact is disconnected, the KM2 coil loses power, the KM2 main contact is disconnected, and the second hot water circulation pump 12 stops.

[0045] exist Figure 3 In the example, the 0+ and 0- terminals of the analog module 302 are connected to the temperature sensor 5 in the water tank 18 through the transmitter 17, and the terminals 0M and 0 of the analog module 302 are connected to the control terminals of the electric regulating valve 4. The programmable logic controller 3 detects the temperature in the water tank 18 and adjusts the opening of the electric regulating valve 4. The closer the temperature is to the set temperature, the smaller the opening of the electric regulating valve 4 is, and the greater the temperature is from the set temperature, the greater the opening of the electric regulating valve 4 is. The opening feedback signal of the electric regulating valve 4 is connected to the terminals 1+ and 1- of the analog module 302. When the opening of the electric regulating valve 4 output by the programmable logic controller 3 is inconsistent with the opening of the electric regulating valve 4 feedback received within 20S, the program in the programmable logic controller 3 determines that the electric regulating valve 4 is abnormal and outputs an alarm message on the touch screen. When the programmable logic controller 3 detects that the temperature of the water tank 18 exceeds the set temperature upper limit, Q0.2 outputs a signal, and the high temperature protection solenoid valve 6 is energized to cut off the steam entering the pipe of the water tank 18 and stop heating. A touch screen is installed in the boiler room, and the touch screen is connected to the programmable logic controller 3 on each rooftop. The programmable logic controller 3 determines whether the electric control valve 4 is working normally by comparing the difference between the output and feedback opening of the electric control valve 4 within 2 seconds. If there is any abnormality, an alarm signal is output in time and displayed on the touch screen to remind the staff to repair it.

[0046] The programmable logic controller 3 controls the opening of the electric regulating valve 4 by calculating the difference between the current temperature of the water tank 18 and the set temperature. When the temperature difference is ≥8°C, the regulating valve is opened 100%; when the temperature difference is 5°C≤<8°C, the regulating valve is opened 80%; when the temperature difference is 3°C≤<5°C, the regulating valve is opened 50%; when the temperature difference is 0.5°C≤<3°C, the regulating valve is opened 30%; when the temperature difference is <0.5°C, the regulating valve is closed.

[0047] According to the water usage characteristics of the people in the dormitory building, the hot water circulation pump is turned on from 5:00 to 10:00 and 15:00 to 24:00 every day, and the pump is stopped at other times. This not only reduces the heat loss of hot water circulating in the pipes, but also saves electricity bills.

[0048] After the transformation, actual measurements show that about 200 kg of biomass pellet fuel can be saved every day. There are 23 hot water circulation pumps in normal use on the roof every day. After changing to fixed time period operation, about 31,000 kWh of electricity can be saved throughout the year, and the water tank 18 temperature has never exceeded the limit.

[0049] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in the specification in a similar manner.

[0050] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0051] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0052] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0053] It should be understood that the above description is for illustration and not for limitation. By reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by these claims. For the purpose of comprehensiveness, all articles and references, including the disclosures of patent applications and announcements, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to abandon the subject matter, nor should it be considered that the inventor has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve, characterized in that: include: Main power supply; at least one hot water circulation circuit, the hot water circulation circuit being electrically connected to the main power supply; A switching power supply, the switching power supply is electrically connected to the main power supply; A programmable logic controller, the programmable logic controller is electrically connected to the switching power supply; A temperature sensor for sensing the temperature in the water tank, the temperature sensor being electrically connected to the programmable logic controller; An electric regulating valve is arranged in a pipeline, a heat exchanger is arranged in the water tank, the pipeline is connected with the heat exchanger, the programmable logic controller includes a basic module and an analog module, the analog module is electrically connected to the electric regulating valve, and the analog module is electrically connected to the electric regulating valve to control the opening of the electric regulating valve.

2. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: A transmitter is provided between the temperature sensor and the analog module, the temperature sensor is electrically connected to the terminals 0+ and 0- of the analog module through the transmitter, and the electric regulating valve is electrically connected to the terminals 1+ and 1- of the analog module.

3. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: The number of the hot water circulation circuits is two, namely a first hot water circulation circuit and a second hot water circulation circuit, and the first hot water circulation circuit and the second hot water circulation circuit are arranged in parallel.

4. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 3, characterized in that: The first hot water circulation circuit includes a first circuit breaker, a switch KM1, a first thermal relay and a first hot water circulation pump which are electrically connected in sequence, and the first circuit breaker is electrically connected to the main power supply. The second hot water circulation circuit includes a second circuit breaker, a switch KM2, a second thermal relay and a second hot water circulation pump which are electrically connected in sequence, and the second circuit breaker is electrically connected to the main power supply. The basic module is electrically connected to the first thermal relay and the second thermal relay respectively.

5. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: A high temperature protection solenoid valve is arranged on the pipeline, the high temperature protection solenoid valve is electrically connected to the main power supply, and the high temperature protection solenoid valve is located upstream of the electric regulating valve.

6. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 5, characterized in that: The high temperature protection solenoid valve is electrically connected to the basic module.

7. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: A third circuit breaker is electrically connected between the switching power supply and the main power supply, and a fourth circuit breaker is electrically connected to the 24V terminal of the switching power supply.

8. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: A fifth circuit breaker is electrically connected between the electric regulating valve and the main power supply.

9. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 5 or 6, characterized in that: A sixth circuit breaker is electrically connected between the high temperature protection solenoid valve and the main power supply.

10. The thermostatic regulating device for controlling a steam heating water tank by an electric regulating valve according to claim 1, characterized in that: The temperature sensor is arranged at the upper 1 / 3 of the water tank.

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