Automatic control device for electric boiler

Abstract

The present invention provides an electric boiler automatic control device. The electric boiler water heat storage system includes an electric boiler. The electric boiler is connected to an electric boiler outlet pipe and an electric boiler inlet pipe respectively and then connected to an electric boiler plate exchanger. An electric boiler circulation pump is arranged between the electric boiler outlet pipe and the electric boiler inlet pipe. The electric boiler plate exchanger is connected to a primary hot water supply pipe and a primary hot water return pipe respectively and then connected to a heat storage tank and then connected to a heating plate exchanger, on which a heat storage water pump is arranged. The heat storage tank is connected to a heat storage (heat release) working condition water supply pipe and a heat storage (heat release) working condition return pipe respectively, a heat discharge water pump is arranged on the circulation pipeline, the heating plate exchanger is connected to a secondary hot water supply pipe and a secondary hot water return pipe respectively, and a heat supply water pump and a heating secondary pump are arranged on the circulation pipeline; the automatic control device includes: a protective shield, a first temperature collector and a PLC controller, which are respectively connected to the protective shield and the first temperature collector. The system has a simple structure and flexible and diverse control methods.

Description

Technical Field

[0001] The invention relates to the technical field of boiler control, in particular to an automatic control device for an electric boiler, and more particularly to an automatic control device for a water heat storage system of an electric boiler. Background Art

[0002] In the past, coal-fired boilers and gas-fired boilers were often used in central heating boiler rooms. The SO2, NOx and CO2 in the flue gas emitted by them are one of the main sources of air pollution. Therefore, an efficient and environmentally friendly way is needed to replace traditional energy. Electric hot water boilers use electricity as energy and convert it into heat energy. After the boiler is converted, high-temperature water is output to the outside. There is no flue gas emission during the operation of electric boilers, which is a clean energy.

[0003] Electric hot water boilers have the advantages of high efficiency, safety and reliability, convenient function adjustment, low noise, easy maintenance, and clean site. Electric boilers equipped with heat storage tanks and auxiliary equipment constitute electric boiler water heat storage systems, which are suitable for applications such as regional energy storage heating, power grid peak shifting and valley filling, and power supply side balance. The electric boiler water heat storage system uses low-valley electricity to store heat at night and releases heat during peak electricity hours during the day, making full use of the peak-valley electricity price difference, operating different working conditions at different times, saving system operating costs, and achieving significant economic benefits.

[0004] However, the current electric boiler control device has a complex structure and a single control method, which seriously restricts the further improvement of the heating efficiency of the electric boiler. Summary of the invention

[0005] In order to overcome the above problems existing in the prior art, the present invention provides an automatic control device for an electric boiler with a simple structure and a flexible control method.

[0006] The object of the present invention is to provide an electric boiler automatic control device, comprising an electric boiler water heat storage system and an automatic control device, wherein the electric boiler water heat storage system comprises an electric boiler (1), wherein the electric boiler (1) is connected to an electric boiler water outlet pipe (100) and an electric boiler water inlet pipe (110) respectively, wherein the electric boiler water outlet pipe (100) and the electric boiler water inlet pipe (110) are connected to an electric boiler plate (2), wherein the electric boiler water outlet pipe (100) and the electric boiler water inlet pipe (110) are connected to each other via a circulation pipeline, wherein an electric boiler circulation pump (3) is arranged on the circulation pipeline, and wherein the electric boiler circulation pump (3) is a working The electric boiler plate exchanger (2) is connected to a primary hot water supply pipe (120) and a primary hot water return pipe (130) respectively, and the primary hot water supply pipe (120) and the primary hot water return pipe (130) are further connected to a hot water storage tank (5). The primary hot water supply pipe (120) and the primary hot water return pipe (130) are also connected to the heating plate exchanger (7). The primary hot water supply pipe (120) and the primary hot water return pipe (130) are connected via a circulation pipeline. A hot water storage pump (6) is provided on the circulation pipeline. The hot water storage pump (6) is a variable frequency water pump. The hot water storage tank (5) is connected to The heat storage and heat release working condition water supply pipe (180) and the heat storage and heat release working condition water return pipe (190) are respectively connected, the heat storage and heat release working condition water supply pipe (180) and the heat storage and heat release working condition water return pipe (190) are connected through a circulation pipeline, a heat release water pump (9) is arranged on the circulation pipeline, and the heat release water pump (9) is a variable frequency water pump, the heating plate exchanger (7) is respectively connected to the secondary hot water supply pipe (140) and the secondary hot water return pipe (150), the secondary hot water supply pipe (140) and the secondary hot water return pipe (150) are connected through a circulation pipeline, and a heat supply pump (8) and a heat supply pump (9) are arranged on the circulation pipeline. The heat secondary pump (10) is a power frequency water pump, the heat secondary pump (10) is a variable frequency water pump, a secondary hot water supply and return water connecting pipe (160) and a secondary hot water supply and return water bypass pipe (170) are arranged between the secondary hot water supply pipe (140) and the secondary hot water return pipe (150); the automatic control device comprises: a protective shield (14) arranged in the electric boiler (1); a first temperature collector (13) arranged on the water outlet pipe (100) of the electric boiler; and a PLC controller (29) connected to the protective shield (14) and the first temperature collector (13) respectively.

[0007] Preferably, it also includes:

[0008] A three-way valve (16) is arranged on the water outlet pipe (100) of the electric boiler;

[0009] A second temperature collector (15) is arranged on the water inlet pipe (110) of the electric boiler;

[0010] The three-way valve (16), the second temperature collector (15) and the PLC controller (29) are respectively connected.

[0011] Preferably, it also includes:

[0012] A first frequency converter (30) connected to the hot water storage pump (6);

[0013] A third temperature collector (20) is arranged on the secondary hot water supply pipe (140);

[0014] The first frequency converter (30), the third temperature collector (20) and the PLC controller (29) are respectively connected.

[0015] Preferably, it also includes:

[0016] A second frequency converter (31) connected to the hot water pump (9);

[0017] The second frequency converter (31), the third temperature collector (20) and the PLC controller (29) are respectively connected.

[0018] Preferably, it also includes:

[0019] A second regulating valve (27) is arranged on the heat storage and heat release working condition water supply pipe (180);

[0020] A third regulating valve (28) is arranged on the heat storage and heat release working condition water return pipe (190);

[0021] A third pressure collector (25) is arranged on the primary hot water supply pipe (120);

[0022] a fourth pressure collector (26), arranged on the heat storage and heat release working condition water supply pipe (180);

[0023] The second regulating valve (27), the third regulating valve (28), the third pressure collector (25) and the fourth pressure collector (26) are respectively connected to the PLC controller (29).

[0024] Preferably, the hot water supply pump (8) is arranged on the secondary hot water return pipe (150).

[0025] Preferably, it also includes:

[0026] a fourth temperature collector (21), arranged on the secondary hot water supply pipe (140);

[0027] A fifth temperature collector (22) and a sixth temperature collector (23) are arranged on the secondary hot water return pipe (150);

[0028] a seventh temperature collector (24), arranged on the secondary hot water supply and return water connecting pipe (160);

[0029] The hot water supply pump (8), the third temperature collector (20), the fourth temperature collector (21), the fifth temperature collector (22), the sixth temperature collector (23) and the seventh temperature collector (24) are respectively connected to the PLC controller (29).

[0030] Preferably, it also includes:

[0031] a third frequency converter (32) connected to the heating secondary pump (10);

[0032] A first pressure collector (17) is arranged on the secondary hot water supply pipe (140);

[0033] A second pressure collector (18) is arranged on the secondary hot water return pipe (150);

[0034] The third frequency converter (32), the first pressure collector (17) and the second pressure collector (18) are respectively connected to the PLC controller (29).

[0035] Preferably, it also includes:

[0036] A first regulating valve (19) is arranged on the secondary hot water supply and return bypass pipe (170), and the first regulating valve (19) is connected to a PLC controller (29).

[0037] Preferably, it also includes:

[0038] An expansion water tank (4), a water treatment system (11) and a pure water make-up pump (12), wherein the pure water make-up pump (12) is an industrial frequency water pump, the expansion water tank (4) is connected to the electric boiler outlet pipe (100) via the pure water make-up pump (12), one end of the water treatment system (11) is connected to the hot water storage tank (5), and the other end is connected to the secondary hot water supply pipe (140).

[0039] Working principle of the present invention:

[0040] The temperature of the water outlet pipe 100 of the electric boiler is collected by the first temperature collector 13. When the temperature is higher or lower than the set value, the PLC controller 29 controls the protective shield 14 of the electric boiler 1 to rise or fall to adjust the boiler power, so as to stabilize the temperature of the water outlet pipe 100 of the electric boiler at the set value;

[0041] The temperature of the water inlet pipe 110 of the electric boiler is collected by the second temperature collector 15. When the temperature is higher or lower than the set value, the PLC controller 29 controls the valve position of the three-way valve 16 to adjust the temperature of the water inlet pipe 110 of the electric boiler;

[0042] The temperature of the secondary hot water supply pipe 140 is collected by the third temperature collector 20. When the temperature is higher or lower than the set value, the PLC controller 29 controls the frequency of the first frequency converter 30 to adjust the temperature of the secondary hot water supply pipe 140.

[0043] The temperature of the secondary hot water supply pipe 140 is collected by the third temperature collector 20. When the temperature is higher or lower than the set value, the PLC controller 29 controls the frequency of the second frequency converter 31 to adjust the temperature of the secondary hot water supply pipe 140.

[0044] The pressure of the primary hot water supply pipe 120 and the pressure of the heat storage and heat release working condition water supply pipe 180 are collected through the third pressure collector 25 and the fourth pressure collector 26. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the opening of the second regulating valve 27 and the third regulating valve 28 to adjust the resistance of the electric boiler water heat storage system;

[0045] The temperature of the secondary hot water supply pipe 140, the temperature of the secondary hot water return pipe 150, and the temperature of the secondary hot water supply and return connecting pipe 160 are collected by the third temperature collector 20, the fourth temperature collector 21, the fifth temperature collector 22, the sixth temperature collector 23, and the seventh temperature collector 24. The PLC controller 29 compares and calculates the temperature parameters of the secondary hot water supply pipe 140, the secondary hot water return pipe 150, and the secondary hot water supply and return bypass pipe 170 to control the number of running hot water supply pumps 8;

[0046] The pressure of the secondary hot water supply pipe 140 and the pressure of the secondary hot water return pipe 150 are collected by the first pressure collector 17 and the second pressure collector 18. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the frequency of the third frequency converter 32 to adjust the pressure difference between the secondary hot water supply pipe 140 and the secondary hot water return pipe 150;

[0047] The pressure of the secondary hot water supply pipe 140 and the pressure of the secondary hot water return pipe 150 are collected through the first pressure collector 17 and the second pressure collector 18. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the opening of the first regulating valve 19 to adjust the pressure difference between the secondary hot water supply pipe 140 and the secondary hot water return pipe 150.

[0048] Beneficial effects of the present invention:

[0049] The structure is simple and the control methods are flexible and diverse.

[0050] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention.

[0051] BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in view of the following description in conjunction with the accompanying drawings, in which:

[0053] Figure 1 A structural diagram of an electric boiler water heat storage system according to an embodiment of the present invention;

[0054] Figure 2 is a structural block diagram of an automatic control device for an electric boiler water heat storage system according to an embodiment of the present invention;

[0055] Figure 3 This is a structural diagram of an electric boiler in single supply operation mode according to an embodiment of the present invention;

[0056] Figure 4 A structural diagram of a storage-and-supply operation mode according to an embodiment of the present invention;

[0057] Figure 5 This is a structural diagram of a single supply working condition of a hot water storage tank according to an embodiment of the present invention;

[0058] Figure 6 A structural diagram of a combined heating operation according to an embodiment of the present invention;

[0059] Figure 7 A control principle diagram of regulating the outlet water pipe temperature T1 of an electric boiler by an automatic control device according to an embodiment of the present invention;

[0060] Figure 8 A control principle diagram of adjusting the temperature T2 of the water inlet pipe of an electric boiler by an automatic control device according to an embodiment of the present invention;

[0061] Fig. 9 A control principle diagram of adjusting the temperature T3 of the secondary hot water supply pipe by the automatic control device according to an embodiment of the present invention;

[0062] Fig.10 A control principle diagram of adjusting the secondary hot water supply temperature T3 by an automatic control device according to an embodiment of the present invention;

[0063] Fig.11 A control principle diagram of regulating the resistance of an electric boiler water heat storage system by an automatic control device according to an embodiment of the present invention;

[0064] Fig.12 A control principle diagram of controlling the number of hot water pumps in operation by an automatic control device according to an embodiment of the present invention;

[0065] Fig.13 A control principle diagram of regulating the secondary hot water supply and return water pressure difference (P1-P2) by an automatic control device according to an embodiment of the present invention;

[0066] Fig.14 A control principle diagram of regulating the secondary hot water supply and return water pressure difference (P1-P2) according to an automatic control device of an embodiment of the present invention

[0067] The reference numerals are: 1-electric boiler; 2-electric boiler plate changer; 3-boiler circulation pump (power frequency); 4-expansion water tank;

[0068] 5-heat storage tank; 6-heat storage pump (variable frequency); 7-heating plate exchanger; 8-heat supply pump (industrial frequency); 9-heat discharge pump (variable frequency);

[0069] 10-heating secondary pump (variable frequency); 11-water treatment system; 12-pure water replenishment pump (industrial frequency); 13-first temperature collector;

[0070] 14-protection shield; 15-second temperature collector; 16-three-way valve; 17-first pressure collector; 18-second pressure collector;

[0071] 19-first regulating valve; 20-third temperature collector; 21-fourth temperature collector; 22-fifth temperature collector;

[0072] 23-sixth temperature collector; 24-seventh temperature collector; 25-third pressure collector; 26-fourth pressure collector;

[0073] 27-second regulating valve; 28-third regulating valve; 29-PLC controller; 30-first frequency converter; 31-second frequency converter;

[0074] 32-third frequency converter; 100-water outlet pipe of electric boiler; 110-water inlet pipe of electric boiler; 120-primary hot water supply pipe;

[0075] 130-primary hot water return pipe; 140-secondary hot water supply pipe; 150-secondary hot water return pipe;

[0076] 160-Secondary hot water supply and return water connecting pipe; 170-Secondary hot water supply and return water bypass pipe; 180-Heat storage and heat release working condition water supply pipe;

[0077] 190-Return pipe for heat storage and heat release conditions DETAILED DESCRIPTION

[0078] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the protection scope of the present invention.

[0079] See also Figure 1 and Figure 2 The electric boiler automatic control device of this embodiment is connected to an electric boiler water heat storage system. The electric boiler water heat storage system includes an electric boiler 1, which is connected to an electric boiler outlet pipe 100 and an electric boiler inlet pipe 110 respectively. The electric boiler outlet pipe 100 and the electric boiler inlet pipe 110 are connected to the electric boiler plate changer 2. The electric boiler outlet pipe 100 and the electric boiler inlet pipe 110 are connected through a circulation pipeline, and an electric boiler circulation pump 3 is provided on the circulation pipeline. The electric boiler plate changer 2 is connected to a primary hot water supply pipe 120 and a primary hot water return pipe 130 respectively. The primary hot water supply pipe 120 and the primary hot water return pipe 130 are further connected to a heat storage tank 5. The primary hot water supply pipe 120 and the primary hot water return pipe 130 are also connected to the heating plate changer 7. The primary hot water supply pipe 120 and the primary hot water return pipe 130 are connected through a circulation pipeline, and a heat storage water pump 6 is provided on the circulation pipeline. The heat storage tank 5 is connected to the heat storage and heat release working condition water supply pipe 180 and the heat storage and heat release working condition water return pipe 190 respectively. The heat storage and heat release working condition water supply pipe 180 and the heat storage and heat release working condition water return pipe 190 are connected through a circulation pipeline, and a heat release water pump 9 is arranged on the circulation pipeline. The heating plate exchanger 7 is connected to the secondary hot water supply pipe 140 and the secondary hot water return pipe 150 respectively. The secondary hot water supply pipe 140 and the secondary hot water return pipe 150 are connected through a circulation pipeline, and a hot water supply pump 8 and a heating secondary pump 10 are arranged on the circulation pipeline, and a secondary hot water supply and return water connecting pipe 160 and a secondary hot water supply and return water bypass pipe 170 are arranged between the secondary hot water supply pipe 140 and the secondary hot water return pipe 150. The automatic control device includes a first frequency converter 30 connected to the hot water storage pump 6; a second frequency converter 31 connected to the hot water discharge pump 9; a third frequency converter 32 connected to the secondary heating pump 10; a protective shield 14 arranged in the electric boiler 1; a first temperature collector 13 and a three-way valve 16 arranged on the outlet pipe 100 of the electric boiler; a second temperature collector 15 arranged on the inlet pipe 110 of the electric boiler; a third pressure collector 25 arranged on the primary hot water supply pipe 120; and a fourth pressure collector arranged on the water supply pipe 180 of the heat storage and heat release working condition. 26, a second regulating valve 27; a third regulating valve 28 arranged on the return pipe 190 of the heat storage and heat release working condition; a first regulating valve 19 arranged on the secondary hot water supply and return bypass pipe 170; a first pressure collector 17, a third temperature collector 20, and a fourth temperature collector 21 arranged on the secondary hot water supply pipe 140; a second pressure collector 18, a fifth temperature collector 22, and a sixth temperature collector 23 arranged on the secondary hot water return pipe 150; a seventh temperature collector 24 arranged on the secondary hot water supply and return connecting pipe 160.

[0080] Based on the above structural setting, the present invention can be adjusted as follows:

[0081] 1. Adjustment of the outlet temperature T1 of the electric boiler

[0082] Combined with reference Figure 7 , the specific control strategy is:

[0083] The temperature of the water outlet pipe 100 of the electric boiler is collected through the first temperature collector 13. When the temperature is higher or lower than the set value, the PLC controller 29 controls the protective shield 14 of the electric boiler 1 to rise or fall to adjust the boiler power and achieve the temperature of the water outlet pipe 100 of the electric boiler to be stable at the set value.

[0084] 2. Adjustment of the water inlet temperature T2 of the electric boiler

[0085] Combined with reference Figure 8 , the specific control strategy is:

[0086] The temperature of the water inlet pipe 110 of the electric boiler is collected through the second temperature collector 15 . When the temperature is lower than the set value, the PLC controller 29 controls the valve position of the three-way valve 16 to adjust the temperature of the water inlet pipe 110 of the electric boiler.

[0087] 3. Secondary hot water supply pipe temperature T3 adjustment

[0088] Combined with reference Fig. 9 , the specific control strategy is:

[0089] The temperature of the secondary hot water supply pipe 140 is collected through the third temperature collector 20 . When the temperature is higher or lower than a set value, the PLC controller 29 controls the frequency of the first inverter 30 to adjust the temperature of the secondary hot water supply pipe 140 .

[0090] 4. Secondary hot water supply pipe temperature T3 adjustment

[0091] Combined with reference Fig.10 , the specific control strategy is:

[0092] The temperature of the secondary hot water supply pipe 140 is collected through the third temperature collector 20 . When the temperature is higher or lower than a set value, the PLC controller 29 controls the frequency of the second frequency converter 31 to adjust the temperature of the secondary hot water supply pipe 140 .

[0093] 5. Resistance adjustment of electric boiler water heat storage system

[0094] Combined with reference Fig.11 , the specific control strategy is:

[0095] The pressure of the primary hot water supply pipe 120 and the pressure of the heat storage and heat release working condition water supply pipe 180 are collected through the third pressure collector 25 and the fourth pressure collector 26. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the opening of the second regulating valve 27 and the third regulating valve 28 to adjust the resistance of the electric boiler water heat storage system.

[0096] 6. Control of the number of hot water pumps in operation

[0097] Combined with reference Fig.12 , the specific control strategy is:

[0098] The temperature of the secondary hot water supply pipe 140, the temperature of the secondary hot water return pipe 150, and the temperature of the secondary hot water supply and return connecting pipe 160 are collected through the third temperature collector 20, the fourth temperature collector 21, the fifth temperature collector 22, the sixth temperature collector 23, and the seventh temperature collector 24. The PLC controller 29 compares and calculates the temperature parameters of the secondary hot water supply pipe 140, the secondary hot water return pipe 150, and the secondary hot water supply and return connecting pipe 160, determines the water flow direction of the secondary hot water supply and return connecting pipe 160, and then analyzes it in combination with the temperature values ​​of each pipe. When the return water flows from the secondary hot water return pipe 150 to the secondary hot water supply pipe 140 through the secondary hot water supply and return connecting pipe 160, a hot water supply pump 8 is turned on. When the supply water flows from the secondary hot water supply pipe 140 to the secondary hot water return pipe 150 through the secondary hot water supply and return connecting pipe 160, and the temperature difference between the two secondary hot water return pipes 150 is greater than the set value, a hot water supply pump 8 is turned off. This is used to automatically control the number of hot water supply pumps 8 in operation.

[0099] 7. Secondary hot water supply and return pipe pressure difference (P1-P2) adjustment

[0100] Combined with reference Fig.13 , the specific control strategy is:

[0101] The pressure of the secondary hot water supply pipe 140 and the pressure of the secondary hot water return pipe 150 are collected through the first pressure collector 17 and the second pressure collector 18. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the frequency of the third frequency converter 32 to adjust the pressure difference between the secondary hot water supply pipe 140 and the secondary hot water return pipe 150.

[0102] 8. Secondary hot water supply and return pipe pressure difference (P1-P2) adjustment

[0103] Combined with reference Fig.14 , the specific control strategy is:

[0104] The pressure of the secondary hot water supply pipe 140 and the pressure of the secondary hot water return pipe 150 are collected through the first pressure collector 17 and the second pressure collector 18. When the pressure difference is higher or lower than the set value, the PLC controller 29 controls the opening of the first regulating valve 19 to adjust the pressure difference between the secondary hot water supply pipe 140 and the secondary hot water return pipe 150.

[0105] See also Figure 3-Figure 6 Under four different working conditions, different automatic control devices are combined and applied to automatically adjust the temperature of the electric boiler outlet pipe, the temperature of the electric boiler inlet pipe, the temperature of the secondary hot water supply pipe, the resistance of the electric boiler water heat storage system, and the pressure difference of the secondary hot water supply and return pipes. The number of running hot water pumps can be automatically controlled to ensure that the output of the boiler and water pump matches the energy demand on the user side, so that the electric boiler water heat storage system can operate automatically, economically and stably.

[0106] The technical solutions provided by the embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, those skilled in the art may make changes in the specific implementation methods and application scopes according to the embodiments of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. An automatic control device for an electric boiler, characterized in that: The invention comprises an electric boiler water heat storage system and an automatic control device, wherein the electric boiler water heat storage system comprises an electric boiler (1), wherein the electric boiler (1) is connected to an electric boiler water outlet pipe (100) and an electric boiler water inlet pipe (110) respectively, wherein the electric boiler water outlet pipe (100) and the electric boiler water inlet pipe (110) are further connected to an electric boiler plate changer (2), wherein the electric boiler water outlet pipe (100) and the electric boiler water inlet pipe (110) are connected via a circulation pipeline, wherein an electric boiler circulation pump (3) is arranged on the circulation pipeline, wherein the electric boiler circulation pump (3) is a power frequency water pump, and the electric boiler plate changer (2) is connected to a primary A hot water supply pipe (120) and a primary hot water return pipe (130) are respectively connected, the primary hot water supply pipe (120) and the primary hot water return pipe (130) are further connected to a heat storage tank (5), the primary hot water supply pipe (120) and the primary hot water return pipe (130) are further connected to a heating plate exchanger (7), the primary hot water supply pipe (120) and the primary hot water return pipe (130) are connected via a circulation pipeline, a heat storage water pump (6) is provided on the circulation pipeline, the heat storage water pump (6) is a variable frequency water pump, the heat storage tank (5) and the heat storage and heat release working condition water supply pipe (1 The heat storage and heat release working condition water supply pipe (180) and the heat storage and heat release working condition water return pipe (190) are respectively connected, the heat storage and heat release working condition water supply pipe (180) and the heat storage and heat release working condition water return pipe (190) are connected via a circulation pipeline, a heat release water pump (9) is arranged on the circulation pipeline, and the heat release water pump (9) is a variable frequency water pump, the heating plate exchanger (7) is respectively connected to the secondary hot water supply pipe (140) and the secondary hot water return pipe (150), the secondary hot water supply pipe (140) and the secondary hot water return pipe (150) are connected via a circulation pipeline, and a heat supply pump (8) and a heating secondary pump (150) are arranged on the circulation pipeline. 0), the hot water supply pump (8) is a power frequency water pump, the secondary heat supply pump (10) is a variable frequency water pump, a secondary hot water supply and return water connecting pipe (160) and a secondary hot water supply and return water bypass pipe (170) are arranged between the secondary hot water supply pipe (140) and the secondary hot water return pipe (150); the automatic control device comprises: a protective shield (14) arranged in the electric boiler (1); a first temperature collector (13) arranged on the water outlet pipe (100) of the electric boiler; and a PLC controller (29) connected to the protective shield (14) and the first temperature collector (13) respectively.

2. The automatic control device for electric boiler according to claim 1, characterized in that Also includes: A three-way valve (16) is arranged on the water outlet pipe (100) of the electric boiler; A second temperature collector (15) is arranged on the water inlet pipe (110) of the electric boiler; The three-way valve (16), the second temperature collector (15) and the PLC controller (29) are respectively connected.

3. The automatic control device for electric boiler according to claim 1 is characterized in that Also includes: A first frequency converter (30) connected to the hot water storage pump (6); A third temperature collector (20) is arranged on the secondary hot water supply pipe (140); The first frequency converter (30), the third temperature collector (20) and the PLC controller (29) are respectively connected.

4. The automatic control device for electric boiler according to claim 3 is characterized in that Also includes: A second frequency converter (31) connected to the hot water pump (9); The second frequency converter (31), the third temperature collector (20) and the PLC controller (29) are respectively connected.

5. The automatic control device for electric boiler according to claim 1, characterized in that Also includes: A second regulating valve (27) is arranged on the heat storage and heat release working condition water supply pipe (180); A third regulating valve (28) is arranged on the heat storage and heat release working condition water return pipe (190); A third pressure collector (25) is arranged on the primary hot water supply pipe (120); a fourth pressure collector (26), arranged on the heat storage and heat release working condition water supply pipe (180); The second regulating valve (27), the third regulating valve (28), the third pressure collector (25) and the fourth pressure collector (26) are respectively connected to the PLC controller (29).

6. The automatic control device for electric boiler according to claim 1, characterized in that The hot water supply pump (8) is arranged on the secondary hot water return pipe (150).

7. The automatic control device for electric boiler according to claim 6, characterized in that Also includes: a fourth temperature collector (21), arranged on the secondary hot water supply pipe (140); A fifth temperature collector (22) and a sixth temperature collector (23) are arranged on the secondary hot water return pipe (150); a seventh temperature collector (24), arranged on the secondary hot water supply and return water connecting pipe (160); The hot water supply pump (8), the third temperature collector (20), the fourth temperature collector (21), the fifth temperature collector (22), the sixth temperature collector (23) and the seventh temperature collector (24) are respectively connected to the PLC controller (29).

8. The automatic control device for electric boiler according to claim 1, characterized in that Also includes: a third frequency converter (32) connected to the heating secondary pump (10); A first pressure collector (17) is arranged on the secondary hot water supply pipe (140); A second pressure collector (18) is arranged on the secondary hot water return pipe (150); The third frequency converter (32), the first pressure collector (17) and the second pressure collector (18) are respectively connected to the PLC controller (29).

9. The electric boiler automatic control device according to claim 1, characterized in that Also includes: A first regulating valve (19) is arranged on the secondary hot water supply and return bypass pipe (170), and the first regulating valve (19) is connected to a PLC controller (29).

10. The automatic control device for electric boiler according to claim 1, characterized in that Also includes: An expansion water tank (4), a water treatment system (11) and a pure water make-up pump (12), wherein the pure water make-up pump (12) is an industrial frequency water pump, the expansion water tank (4) is connected to the electric boiler outlet pipe (100) via the pure water make-up pump (12), one end of the water treatment system (11) is connected to the hot water storage tank (5), and the other end is connected to the secondary hot water supply pipe (140).

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