Dual-purpose furnace system and control method thereof

Abstract

The present invention discloses a dual-purpose furnace system and a control method thereof, and relates to the field of household furnaces. The dual-purpose furnace system comprises: a water heater, a heating return pipe, a heating outlet pipe, a circulating water pipe, a heat exchanger, a water pressure sensor, a water supply pipe, a water supply valve, a loop control valve, and a controller; the controller is electrically connected to the loop control valve, the water pressure sensor, and the water supply valve, and the controller switches the loop control valve and controls the on-off of the water supply valve according to the detection result of the water pressure sensor; the control method of the dual-purpose furnace system automatically controls the dual-purpose furnace system according to the water pressure change of the water pressure sensor, the controller controls the water supply valve to open, and the water supply pipe supplies water to the heating return pipe, so that the water pressure in the pipeline meets the demand; the loop control valve controls the loop through which water flows, so that the water supply pipe can supply water to the heating loop or the circulating loop, and meet the water supply demand of the dual-purpose furnace system.

Description

Technical Field

[0001] The present invention relates to the field of household stoves, and in particular to a dual-purpose stove system and a control method thereof. Background Art

[0002] Some households use non-central heating, which requires heating water through household stoves and circulating it for heating. Dual-purpose stove systems that can bear the heat load of both domestic water and household heating water have become the first choice for non-central heating users.

[0003] The hot water pipeline of the dual-purpose boiler system is divided into two parts. One part is a closed heating pipeline, where hot water circulates in the indoor pipeline to heat the indoor environment, and the other part is an open domestic water pipeline, where hot water flows directly for domestic use. In order to ensure the normal circulation of hot water, it is necessary to replenish water in time to ensure normal water pressure in the pipeline.

[0004] For the dual-purpose furnace system products currently on the market, when there is a lack of water in the heating pipes, people can only go to the door to manually open the water replenishment valve to replenish water. When replenishing water, they also use the timed water replenishment method to replenish water repeatedly, which is time-consuming. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that water replenishment of a dual-purpose furnace system in the prior art is time-consuming and labor-intensive, and to provide a dual-purpose furnace system and a control method thereof.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] In a first aspect, the present invention provides a dual-purpose furnace system, the dual-purpose furnace system comprising: a water heater, a heating return pipe, a heating outlet pipe, a circulating water pipe, a heat exchanger, a water pressure sensor, a water supply pipe, a water supply valve, a loop control valve, and a controller;

[0008] The heating return pipe, the water heater, the heating outlet pipe, and the heating return pipe are sequentially connected to form a heating loop; the heating return pipe, the water heater, the heating outlet pipe, the circulating water pipe, the heat exchanger, and the heating return pipe are sequentially connected to form a circulating loop;

[0009] The water pressure sensor is arranged in the heating circuit and / or the circulation circuit, and is used to detect the water pressure of the heating circuit and / or the circulation circuit;

[0010] The water supply pipe is connected between the heating water return pipe and the water supply end; the water supply valve is arranged on the water supply pipe to control the connection and disconnection between the water supply pipe and the water supply end;

[0011] The circuit control valve is connected to the circulating water pipe and the heating water outlet pipe, and is used to switch the heating circuit and / or the circulating circuit;

[0012] The controller is electrically connected to the loop control valve, the water pressure sensor and the water supply valve. The controller switches the loop control valve and controls the on-off of the water supply valve according to the detection result of the water pressure sensor.

[0013] In this solution, the water in the heating circuit is heated by a water heater and circulated in the heating circuit to provide heating for the external environment; the circulation pipeline is connected to the heat exchanger, and the hot water from the heating outlet pipe flows through the heat exchanger to heat the domestic water; thereby, the supply of heating water and domestic water for the dual-purpose furnace system is realized. The water supply pipe is connected to the water supply end and the heating circuit. When the water pressure sensor detects that the water pressure of the heating circuit and / or the circulation circuit is reduced, the controller controls the water supply valve to open, and the water supply pipe supplies water to the heating return pipe so that the water pressure in the pipeline meets the demand; the circuit control valve controls the circuit through which the water flows, so that the water supply pipe can supply water to the heating circuit or the circulation circuit to meet the water supply demand of the dual-purpose furnace system; the controller is electrically connected to the circuit control valve, the water pressure sensor and the water supply valve, and switches the circuit control valve and controls the on-off of the water supply valve according to the detection result of the water pressure sensor, so that the water supply of the heating circuit and / or the circulation circuit can be automatically controlled according to the change of water pressure.

[0014] Preferably, the loop control valve is a three-way valve, the three-way valve has a first port, a second port and a third port, the first port is connected to the heating water outlet pipe, the second port is connected to the circulating water pipe, and the third port is connected to the heating water outlet pipe;

[0015] The controller controls the first port and the second port to be connected to switch the dual-purpose furnace system to a circulation loop, and the controller controls the first port and the third port to be connected to switch the dual-purpose furnace system to a heating loop.

[0016] In this solution, the loop control valve is a three-way valve, and the controller controls the first port of the three-way valve to be connected to the second port, so that the dual-purpose furnace switches to the circulation loop to replenish water for the circulation loop or heat domestic water through the circulation loop; the controller controls the first port of the three-way valve to be connected to the third port, so that the dual-purpose furnace switches to the heating loop to replenish water for the heating loop or provide indoor heating; the three-way valve is used for adjustment, which has a simple structure, convenient control and low cost.

[0017] Preferably, the water pressure sensor is arranged in the heating water return pipe and is used to detect the water pressure in the heating water return pipe.

[0018] In this solution, the water pressure sensor is installed in the heating return pipe, so that only one water pressure sensor is needed to detect the water pressure of the heating circuit and the circulation circuit, saving the cost of the water pressure sensor and reducing the installation steps of the water pressure sensor.

[0019] Preferably, when the water pressure sensor detects that the water pressure P is less than the first set pressure P1, the controller switches the circuit control valve so that the heating circuit is connected and the circulation circuit is disconnected, and the controller controls the water supply valve to open to supply water to the heating circuit.

[0020] In this solution, when the water pressure sensor detects that the water pressure P is less than the first set pressure P1, the heating circuit is controlled to be connected, the circulation circuit is disconnected, and the water supply valve is opened to replenish water for the heating circuit first, so as to avoid the circulation circuit affecting the heating circuit during replenishment, resulting in the water volume in the heating circuit not meeting the demand.

[0021] Preferably, after the water replenishment of the heating circuit is completed, the controller switches the circuit control valve so that the circulation circuit is connected and the heating circuit is disconnected, and the controller controls the water replenishment valve to open to replenish the circulation circuit.

[0022] In this solution, after the heating circuit is replenished with water, the circuit control valve is switched to disconnect the heating circuit and connect the circulation circuit, and the replenishment valve is opened to replenish water for the circulation circuit, so as to avoid affecting the heating circuit that has been replenished with water when the circulation circuit is connected, and at the same time reduce the impact of the heating circuit on the circulation circuit when replenishing water for the circulation circuit.

[0023] Preferably, the dual-purpose furnace system further comprises a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller;

[0024] When the water pressure sensor detects that the water pressure P is greater than or equal to the first set pressure P1, the controller controls the circulation pump to start; when the water pressure sensor detects that the water pressure P is greater than or equal to the second set pressure P2, the controller controls the water supply valve to close, and the controller controls the circulation pump to continue working for the first set time T1.

[0025] In this solution, after the water pressure P is greater than the first set pressure P1, the circulation pump is started to accelerate water replenishment to prevent the circulation pump from idling and causing damage to the circulation pump; water replenishment is continued until the water pressure reaches the second set pressure P2, and the water replenishment valve is closed to stop water replenishment. At this time, the circulation pump continues to work for the first set time T1 to circulate the water in the pipeline and discharge the gas in the water, thereby reducing the insufficient heat load caused by excessive gas content in the water.

[0026] In a second aspect, the present invention provides a control method for a dual-purpose furnace system, the control method is used to control the dual-purpose furnace system as described above, and the control method comprises the following steps:

[0027] S1, judging whether to replenish water according to the water pressure P detected by the water pressure sensor, if P is less than the first set pressure P1, executing step S2, otherwise controlling the water replenishment valve to remain closed;

[0028] S2, switching the circuit control valve so that the heating circuit is connected and the circulation circuit is disconnected, and opening the water supply valve to supply water to the heating circuit;

[0029] S3, switch the loop control valve so that the circulation loop is connected and the heating loop is disconnected, and open the water replenishment valve to replenish water for the circulation water circuit.

[0030] In the present scheme, the control method determines whether to replenish water through the water pressure P detected by the water pressure sensor. When the water pressure P is less than the first set pressure P1, the method first switches to the heating circuit to replenish water for the heating circuit. At this time, the circulation circuit is disconnected to avoid the circulation circuit affecting the heating circuit during water replenishment; then switches to the circulation circuit again, disconnects the heating circuit, and replenishes water for the circulation circuit. In this way, the heating circuit and the circulation circuit are automatically replenished with water according to the changes in water pressure, avoiding manual on-site maintenance. At the same time, water replenishment is determined based on the water pressure P instead of timed water replenishment, which makes it easy to control the amount of water replenishment, which is beneficial to water circulation in the heating circuit and / or the circulation circuit.

[0031] Preferably, the dual-purpose furnace system further comprises a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller; step S2 comprises the following steps:

[0032] S21, opening the water supply valve to supply water to the heating return pipe;

[0033] S22, comparing the water pressure P detected by the water pressure sensor with the first set pressure P1, if P≥P1, executing step S23;

[0034] S23, adjusting the circuit control valve so that the heating circuit remains connected and the circulation circuit remains disconnected, and starting the circulation pump to accelerate water replenishment;

[0035] S24, comparing the water pressure P detected by the water pressure sensor with the second set pressure P2, if P≥P2, closing the water supply valve, and the circulation pump continues to work for the first set time T1;

[0036] S25, comparing the water pressure P detected by the water pressure sensor with the third set pressure P3, if P≥P3, executing step S3; if P<P3, repeating steps S23 to S24.

[0037] In this scheme, when the water pressure P is lower than the first set pressure P1, the water supply valve is opened to supply water to the heating circuit. As the water supply is carried out, the water pressure in the heating circuit increases. After the water pressure P≥P1, the circulating pump is turned on to accelerate the water supply to avoid the circulation pump from idling and causing damage to the circulation pump. When the continuous water supply makes the water pressure P≥the second set pressure P2, the water supply valve is closed to avoid excessive water pressure in the pipe. At this time, the circulation pump continues to work for the first set time T1 to drive the water to continue to circulate in the heating circuit and discharge the air in the heating circuit. After T1, the water pressure P is detected. If the water pressure P≥the third set pressure P3, the water pressure meets the demand and the heating circuit is replenished. If the water pressure P is less than P3, it means that there is too much air in the heating circuit. At this time, the water supply action is repeated to make the water pressure meet the demand. In this way, the heating circuit is automatically controlled according to the change of water pressure, the water supply is well controllable, and the water supply effect is better.

[0038] Preferably, the dual-purpose furnace system further comprises a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller; step S3 comprises the following steps:

[0039] S31, opening the water supply valve to supply water to the heating return pipe;

[0040] S32, adjusting the loop control valve so that the heating loop remains closed and the circulation loop remains connected, and starting the circulation pump to accelerate water replenishment;

[0041] S33, comparing the water pressure P detected by the water pressure sensor with the second set pressure P2, if P≥P2, closing the water supply valve, and the circulation pump continues to work for the first set time T1;

[0042] S34, comparing the water pressure P detected by the water pressure sensor with a third set pressure P3, if P≥P3, turning off the circulation pump, if P<P3, repeating steps S23 to S33.

[0043] In this solution, when replenishing water to the circulation loop, the circulation pump is started to accelerate the water replenishment; when the water pressure P is greater than or equal to the second set pressure P2, the water replenishment valve is closed to avoid excessive water pressure in the pipeline. At this time, the circulation pump continues to operate for the first set time T1 to drive the water to circulate in the circulation loop for exhaust; after T1 time, the water pressure P is compared with the third set pressure P3. If P≥P3, the gas in the water has been exhausted and the water pressure meets the requirements, and the water replenishment ends; if P<P3, it means that there is too much gas in the water, and the water replenishment action needs to be repeated to make the water pressure meet the requirements. Since the length of the circulation loop is much smaller than that of the heating loop, the excessive gas in the pipeline at this time is caused by excessive gas in the heating loop. Therefore, the system switches to the heating loop, opens the water replenishment valve to replenish water to the heating loop again, so that the water pressures of the heating loop and the circulation loop meet the requirements. Thus, according to the change of the water pressure, the automatic water replenishment of the circulation loop is realized, and the water replenishment effect is good and the controllability is better.

[0044] Preferably, the control method further includes the following steps:

[0045] S4. Compare the total water replenishment duration T with the second set time T2. If T≥T2, a leakage alarm is issued; otherwise, step S5 is executed;

[0046] S5. Perform a leakage detection on the dual-purpose furnace system.

[0047] In this solution, after the water replenishment of both the heating loop and the circulation loop is completed, the total water replenishment duration T is compared with the second set time T2. If T is greater than or equal to T2, the water replenishment time is too long, and there may be a leakage in the pipeline. At this time, a leakage alarm is issued to remind the user to check;

[0048] After the water replenishment is completed, a routine leakage detection is performed on the dual-purpose furnace system to detect the leakage of the dual-purpose furnace at any time and give an early warning in time.

[0049] Preferably, step S5 includes the following steps:

[0050] S51. Record the water pressure value P0 after the water replenishment ends, and then record the water pressure value Pn every third set time T3;

[0051] S52. Compare each Pn with P0 within the fourth set time T4, where T4>T3. Define Pw as the preset water pressure deviation value. If Pn<P0-Pw, a leakage alarm is issued; otherwise, step S53 is executed;

[0052] S53. Measure the water pressure value Pn' at an interval of the fourth set time T4 from the time point when Pn is measured, and compare Pn with Pn'. If Pn-Pn'>Pw, a leakage alarm is issued.

[0053] In this solution, within the fourth set time T4 after the water replenishment ends, the water pressure values Pn at every third set time T3 are recorded. Each Pn within the fourth set time T4 is compared with the water pressure value P0 at the end of the water replenishment. A deviation value Pw is set. If there exists a Pn such that Pn < P0 - Pw, it indicates that the water pressure drops too quickly within T4 and there is a risk of leakage, and a leakage alarm is issued.

[0054] After the water replenishment ends, if the time exceeds T4, the water pressure values Pn' at an interval of T4 from each Pn are recorded. Each Pn is compared with Pn' in turn. If there exist Pn and Pn' such that Pn - Pn' > Pw, it indicates that the water pressure drops too quickly within T4 starting from the Pn value recording point and there is a risk of leakage, and the dual-purpose furnace system issues a leakage alarm, thereby enabling continuous monitoring of the leakage situation of the dual-purpose furnace system after the water replenishment ends and timely issuing a leakage alarm.

[0055] The positive and progressive effects of the present invention are as follows:

[0056] In the present invention, heating is provided to the outside through the heating circuit, and the circulating circuit heats domestic water to bear the heat load of domestic water, thereby realizing the supply of heating water and domestic water in the dual-purpose furnace system. The make-up water pipe is connected to the water supply end and the heating circuit. When the water pressure sensor detects a decrease in the water pressure in the heating circuit and / or the circulating circuit, the controller controls the make-up water valve to open, and the make-up water pipe replenishes water to the heating return pipe, so that the water pressure in the pipeline meets the requirements; the circuit control valve controls the circuit through which the water flows according to the water pressure of the water pressure sensor, so that the make-up water pipe can replenish water to the heating circuit or the circulating circuit, meeting the make-up water requirements of the dual-purpose furnace system; thereby realizing automatic water replenishment of the dual-purpose furnace system, reducing manual operation, saving water replenishment time, and improving the efficiency and accuracy of water replenishment. Description of the Drawings

[0057] Figure 1 It is a schematic structural diagram of a dual-purpose furnace system according to an embodiment of the present invention.

[0058] Figure 2 It is a flowchart of a water replenishment control method for a dual-purpose furnace according to an embodiment of the present invention.

[0059] Figure 3 It is a flowchart of a leak detection control method for a dual-purpose furnace according to an embodiment of the present invention.

[0060] Description of the Reference Numerals:

[0061] Dual-purpose furnace system 100

[0062] Heating return pipe 110

[0063] Water heater 120

[0064] Heating outlet pipe 130

[0065] Circulating water pipe 140

[0066] Heat exchanger 150

[0067] Water supply pipe 160

[0068] Water supply valve 170

[0069] Loop control valve 200

[0070] Circulation pump 300

[0071] Water pressure sensor 400

[0072] Domestic water inlet pipe 500

[0073] Domestic water pipe 600

[0074] Water supply end 700

[0075] Water terminal 800 DETAILED DESCRIPTION

[0076] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0077] Example 1

[0078] This embodiment discloses a dual-purpose furnace system 100, referring to Figure 1 The dual-purpose furnace system 100 includes a heating circuit, a circulation circuit, a domestic water circuit, a water supply pipe 160, a water supply valve 170 and a controller. The heating circuit supplies water to circulate indoors for heat exchange, the circulation circuit supplies water to circulate to heat the water in the domestic water circuit, the domestic water circuit allows cold water to flow in and hot water to flow out to provide domestic hot water, the water supply pipe 160 is connected to the water supply end 700 and the heating circuit and / or the circulation circuit, and is used to supply water to the heating circuit and / or the circulation circuit; the water supply valve 170 is used to control the connection and closing of the water supply pipe 160; the controller is used to control the switching of the heating circuit and the circulation circuit and the opening and closing of the water supply valve 170.

[0079] The heating circuit includes a heating return pipe 110, a water heater 120 and a heating outlet pipe 130. The heating return pipe 110, the water heater 120, the heating outlet pipe 130 and the heating return pipe 110 are connected in sequence to form a closed loop. The water with a lower water temperature in the heating return pipe 110 is heated by the water heater 120 and then flows through the heating outlet pipe 130 and exchanges heat with the external environment, thereby providing heating for the external environment. The water after heat exchange flows back to the water heater 120 through the heating return pipe 110 to be reheated, thereby realizing the circulation of heating hot water.

[0080] The circulation loop includes a portion of the heating outlet pipe 130, a circulating water pipe 140, a heat exchanger 150, a portion of the heating return pipe 110 and a water heater 120. The portion of the heating return pipe 110, the water heater 120, the portion of the heating outlet pipe 130, the circulating water pipe 140, the heat exchanger 150 and the portion of the heating return pipe 110 are connected in sequence. After the hot water flows out through the heating outlet pipe 130, it flows into the heat exchanger 150 through the circulating water pipe 140, exchanges heat with the domestic water circuit in the heat exchanger 150, and then flows into the heating return pipe 110, and then enters the heating outlet pipe 130 after being heated by the heater, completing the cycle. Part of the pipeline of the circulation loop is repeated with the heating loop, which can reduce the length of the pipeline, save costs, and facilitate the installation of the pipeline.

[0081] Wherein, a loop control valve 200 is provided at the connection between the circulating water pipe 140 and the heating water outlet pipe 130. The loop control valve 200 is electrically connected to the controller and is used to control the dual-purpose furnace system 100 to switch between the heating loop and the circulating loop. In this embodiment, the loop control valve 200 is a three-way valve, which has a first port, a second port and a third port. The first port is connected to the heating water outlet pipe 130, the second port is connected to the circulating water pipe 140, and the third port is connected to the heating water outlet pipe 130. The controller controls the first port and the second port to be connected to switch the dual-purpose furnace system 100 to the circulating loop, and the controller controls the first port and the third port to be connected to switch the dual-purpose furnace system 100 to the heating loop.

[0082] In this embodiment, the dual-purpose furnace system 100 further includes a circulation pump 300 and a water pressure sensor 400. The circulation pump 300 is arranged in the heating circuit and / or the circulation circuit and is electrically connected to the controller, and is used to accelerate the circulation of water in each circuit; the water pressure sensor 400 is arranged in the heating circuit and / or the circulation circuit and is electrically connected to the controller, and is used to detect the water pressure of the heating circuit and / or the circulation circuit. In this embodiment, the circulation pump 300 and the water pressure sensor 400 are both arranged in the heating return pipe 110, so that only one circulation pump 300 and one water pressure sensor 400 are required to realize the water circulation acceleration and water pressure detection of the heating circuit and / or the circulation circuit, which saves costs and facilitates the installation of the circulation pump 300 and the water pressure sensor 400. In addition, in other embodiments, the circulation pump 300 and the water pressure sensor 400 can also be independently arranged one on the heating circuit and the circulation circuit.

[0083] Thus, the water in the heating circuit is heated by the water heater 120 and circulates in the heating circuit to provide heating for the external environment; the circulation pipeline is connected to the heat exchanger 150, and the hot water of the heating water outlet pipe 130 flows through the heat exchanger 150 to heat the domestic water, thereby realizing the supply of heating water and domestic water for the dual-purpose furnace system 100. The water supply pipe 160 is connected with the water supply end 700 and the heating circuit. When the water pressure sensor 400 detects that the water pressure of the heating circuit and / or the circulation circuit is reduced, the controller controls the water supply valve 170 to open, and the water supply pipe 160 replenishes water for the heating return pipe 110, so that the water pressure in the pipeline meets the demand; the circuit control valve 200 controls the circuit through which the water flows, so that the water supply pipe 160 can replenish water for the heating circuit or the circulation circuit to meet the water supply demand of the dual-purpose furnace system 100.

[0084] Specifically, when the water pressure sensor 400 detects that the water pressure P is less than the first set pressure P1, the controller switches the circuit control valve 200 to connect the heating circuit and disconnect the circulation circuit, and the controller controls the water replenishment valve 170 to open to replenish the heating circuit. This prevents the circulation circuit from affecting the heating circuit during replenishment, resulting in the water volume in the heating circuit not meeting the demand. After the heating circuit is replenished, the controller switches the circuit control valve 200 to connect the circulation circuit and disconnect the heating circuit, and the controller controls the water replenishment valve 170 to open to replenish the circulation circuit, so as to avoid affecting the heating circuit that has been replenished when the circulation circuit is connected, and at the same time reduce the impact of the heating circuit on the circulation circuit when replenishing the circulation circuit.

[0085] The first set pressure P1 here can be designed according to the minimum pressure required for the water circulation in the pipeline. In this embodiment, the first set pressure P1 is specifically 0.5 bar.

[0086] Among them, when the water pressure sensor 400 detects that the water pressure P is greater than or equal to the first set pressure P1, the controller controls the circulation pump 300 to start to accelerate the water circulation. The circulation pump 300 starts at a certain water pressure to avoid the circulation pump 300 from idling and causing damage to the circulation pump 300. When the water pressure sensor 400 detects that the water pressure P is greater than or equal to the second set pressure P2, the controller controls the water supply valve 170 to close to avoid excessive water pressure. The controller controls the circulation pump 300 to continue working for the first set time T1 to circulate the water in the pipeline and discharge the gas in the water to reduce the situation of insufficient heat load caused by excessive gas content in the water. After the circulation pump 300 works for T1, if the water pressure sensor 400 detects that the water pressure P is still greater than or equal to the third set pressure P3, the gas in the heating circuit has been discharged and the water supply is completed; if P is less than the third set pressure P3, there is too much gas in the heating circuit and the water supply action needs to be repeated.

[0087] The second set pressure P2 and the third set pressure P3 can be designed according to the pressure limit of the pipeline. In this embodiment, the second set pressure P2 is specifically 1.8 bar, and the third set pressure P3 is 1.2 bar; the first set time T1 can be set according to demand. In this embodiment, T1 is specifically 2 minutes.

[0088] When the heating circuit is replenished with water, the controller switches the circuit control valve 200 so that the heating circuit is disconnected and the circulation circuit is connected. The water replenishment valve 170 is opened to replenish water for the circulation circuit. At this time, the circulation pump 300 is turned on to accelerate the water replenishment. When the water pressure sensor 400 detects that the water pressure P is greater than or equal to the second set pressure P2, the controller controls the water replenishment valve 170 to close to avoid excessive water pressure. The controller controls the circulation pump 300 to continue working for the first set time T1 to circulate the water in the pipeline and discharge the gas in the water. After the circulation pump 300 has been working for T1, if the water pressure sensor 400 detects that the water pressure P is still greater than or equal to the third set pressure P3, the gas in the circulation circuit has been eliminated and the water replenishment is completed; if P is less than the third set pressure P3, switch to the heating circuit and open the water replenishment valve to repeat the water replenishment for the heating circuit.

[0089] The domestic water loop includes a domestic water inlet pipe 500 and a domestic water outlet pipe 600. The domestic water inlet pipe 500 is connected to the water supply end 700, and the domestic water outlet pipe 600 is connected to the water use end 800. The domestic water inlet pipe 500 is connected to the domestic water outlet pipe 600, and the connection between the domestic water inlet pipe 500 and the domestic water outlet pipe 600 is arranged in the heat exchanger 150, so that the heat exchanger 150 can heat the cold water in the domestic water inlet pipe 500 to the required temperature and flow out through the domestic water outlet pipe 600.

[0090] In this embodiment, the water replenishment pipe 160 is connected to the domestic water inlet pipe 500, and the water replenishment pipe 160 is connected to the water supply end 700 through the domestic water inlet pipe 500, thereby improving the utilization efficiency of the pipeline and reducing the cost.

[0091] Example 2

[0092] This embodiment discloses a control method for a dual-purpose furnace system, which is used to control the dual-purpose furnace system 100 in Embodiment 1. Figure 2 and Figure 3 , the control method comprises the following steps:

[0093] S1, judging whether to replenish water according to the water pressure P detected by the water pressure sensor 400, if P is less than the first set pressure P1, executing step S2, otherwise controlling the water replenishment valve 170 to remain closed;

[0094] The water pressure sensor 400 detects that the water pressure P is less than the first set pressure P1 for 3 seconds before executing step S2 to reduce the impact of temporary fluctuations in water pressure on the water replenishment function.

[0095] The first set pressure P1 can be designed according to the minimum pressure required for water circulation in the pipeline. In this embodiment, the first set pressure P1 is specifically 0.5 bar.

[0096] S2, switch the circuit control valve 200 to connect the heating circuit and disconnect the circulation circuit, and open the water supply valve 170 to supply water to the heating circuit;

[0097] Step S2 includes the following steps:

[0098] S21, open the water supply valve 170 to supply water to the heating return pipe 110;

[0099] S22, comparing the water pressure P detected by the water pressure sensor 400 with the first set pressure P1, if P≥P1, executing step S23;

[0100] S23, adjusting the loop control valve 200 so that the heating loop remains connected and the circulation loop remains disconnected, and starting the circulation pump 300 to accelerate water replenishment;

[0101] S24, comparing the water pressure P detected by the water pressure sensor 400 with the second set pressure P2, if P≥P2, closing the water supply valve 170, and the circulation pump 300 continues to work for the first set time T1;

[0102] S25. Compare the water pressure P detected by the water pressure sensor 400 with the third set pressure P3. If P≥P3, execute step S3; if P<P3, repeat steps S23 to S24.

[0103] When the water pressure P is lower than the first set pressure P1, first open the water replenishment valve 170 to replenish water for the heating circuit. As the water replenishment proceeds, the water pressure in the heating circuit increases. After the water pressure P≥P1, the circulating pump 300 is turned on to accelerate the water replenishment to avoid the circulating pump 300 from idling and causing damage to the circulating pump 300. When the continuous water replenishment makes the water pressure P≥the second set pressure P2, the water replenishment valve 170 is closed to avoid excessive water pressure in the pipe. At this time, the circulating pump 300 continues to work for the first set time T1 to drive the water to continue to circulate in the heating circuit and discharge the air in the heating circuit. After T1, the water pressure P is detected. If the water pressure P≥the third set pressure P3, the water pressure meets the demand and the heating circuit is replenished; if the water pressure P is less than P3, it means that there is too much air in the heating circuit. At this time, the water replenishment action is repeated to make the water pressure meet the demand. In this way, the progress of the heating circuit is automatically controlled according to the change of water pressure, the water replenishment is well controllable, and the water replenishment effect is better.

[0104] Among them, the second set pressure P2 and the third set pressure P3 can be designed according to the pressure limit of the pipeline. In this embodiment, the second set pressure P2 is specifically 1.8 bar, and the third set pressure P3 is 1.2 bar; the first set time T1 can be set according to demand. In this embodiment, T1 is specifically 2 minutes.

[0105] S3, switch the circuit control valve 200 to connect the circulation circuit and disconnect the heating circuit, and open the water supply valve 170 to supply water to the circulation water circuit.

[0106] Step S3 includes the following steps:

[0107] S31, open the water supply valve 170 to supply water to the heating return pipe 110;

[0108] S32, adjusting the loop control valve 200 so that the heating loop remains closed and the circulation loop remains connected, and starting the circulation pump 300 to accelerate water replenishment;

[0109] S33, comparing the water pressure P detected by the water pressure sensor 400 with the second set pressure P2, if P≥P2, closing the water supply valve 170, and the circulation pump 300 continues to work for the first set time T1;

[0110] S34, comparing the water pressure P detected by the water pressure sensor 400 with the third set pressure P3, if P≥P3, turning off the circulation pump 300, if P<P3, repeating steps S23 to S33.

[0111] When replenishing water for the circulation loop, since the heating water supply pipe and the heating return pipe 110 have already replenished water in the heating loop, there is no need to determine the water pressure at this time, and the circulation pump 300 is started to accelerate the water replenishment; when the water pressure P is greater than or equal to the second set pressure P2, the water replenishment valve 170 is closed to avoid excessive water pressure in the pipeline. At this time, the circulation pump 300 continues to work for the first set time T1, driving the water to circulate in the circulation loop for exhaust. After T1 time, the water pressure P and the third set pressure P3 are compared. If P≥P3, the gas in the water is discharged, the water pressure meets the requirements, and the water replenishment ends; if P<P3, it means that there is too much gas in the circulation loop. Since the length of the circulation loop is much smaller than the length of the heating loop, the excessive gas in the pipeline at this time is caused by the excessive gas in the heating loop. Therefore, switch to the heating loop, open the water replenishment valve 170 to replenish the heating loop again, so that the water pressure of the heating loop and the circulation loop meets the requirements. In this way, according to the change of water pressure, automatic water replenishment of the circulation loop is achieved, and the water replenishment effect is better and the controllability is better.

[0112] Thus, the control method determines whether to replenish water by the water pressure P detected by the water pressure sensor 400. When the water pressure P is less than the first set pressure P1, it first switches to the heating circuit to replenish water for the heating circuit. At this time, the circulation circuit is disconnected to prevent the circulation circuit from affecting the heating circuit during water replenishment. Subsequently, it switches to the circulation circuit, disconnects the heating circuit, and replenishes water for the circulation circuit. Thus, it automatically replenishes water for the heating circuit and the circulation circuit respectively according to the change of water pressure, avoiding manual on-site maintenance. At the same time, it judges water replenishment according to the water pressure P instead of regular water replenishment, which is convenient for controlling the water replenishment volume and is beneficial to the water circulation in the heating circuit and / or the circulation circuit.

[0113] S4. Compare the total water replenishment duration T with the second set time T2. If T≥T2, then give a leak alarm; otherwise, execute step S5.

[0114] After the water replenishment of both the heating circuit and the circulation circuit is completed, compare the total water replenishment duration T with the second set time T2. If T is greater than or equal to T2, the water replenishment time is too long, and there may be a leak in the pipeline. At this time, give a leak alarm to remind the user to check.

[0115] S5. Conduct a leak detection on the dual-purpose furnace system 100.

[0116] After the water replenishment is completed, conduct a regular leak detection on the dual-purpose furnace system 100 to detect the leak situation of the dual-purpose furnace at any time and give an early warning in time.

[0117] Step S5 includes the following steps:

[0118] S51. Record the water pressure value P0 after the water replenishment is completed, and then record the water pressure value Pn every third set time T3.

[0119] S52. Compare each Pn within the fourth set time T4 with P0, where T4>T3. Define Pw as the preset water pressure deviation value. If Pn<P0 - Pw, then give a leak alarm; otherwise, execute step S53.

[0120] Within the fourth set time T4 after the water replenishment is completed, record the water pressure value Pn every third set time T3, compare each Pn within the fourth set time T4 with the water pressure value P0 at the end of the water replenishment, and set a deviation value Pw. If there exists a Pn that satisfies Pn<P0 - Pw, it means that the water pressure drops too fast within T4, and there is a risk of leakage, and a leak alarm is given.

[0121] S53. Measure the water pressure value Pn' at an interval of the fourth set time T4 from the time point of measuring Pn, and compare Pn with Pn'. If Pn - Pn'>Pw, then give a leak alarm.

[0122] After the water replenishment is completed, if the time exceeds T4, the water pressure value Pn' with an interval of T4 with each Pn is recorded, and each Pn is compared with Pn' in turn. If there are Pn and Pn' that satisfy Pn-Pn'>Pw, it means that the water pressure has dropped too fast within T4 time from the Pn value recording point, and there is a risk of water leakage. The dual-purpose furnace system 100 will issue a water leakage alarm, so that the water leakage of the dual-purpose furnace system 100 can be continuously monitored after the water replenishment is completed, and a water leakage alarm can be issued in time.

[0123] The second setting time T2, the third setting time T3 and the fourth setting time T4 can be designed according to the actual situation. In this embodiment, the second setting time T2 is 10 minutes, the third setting time T3 is 1 hour, and the fourth setting time T4 is 12 hours. The deviation value Pw can be set according to the actual situation. In this embodiment, the deviation value Pw is specifically 0.4 bar.

[0124] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A control method for a dual-purpose furnace system, characterized in that: The dual-purpose furnace system includes: a water heater, a heating return pipe, a heating outlet pipe, a circulating water pipe, a heat exchanger, a water pressure sensor, a water supply pipe, a water supply valve, a loop control valve, and a controller; The heating return pipe, the water heater, the heating outlet pipe, and the heating return pipe are sequentially connected to form a heating loop; the heating return pipe, the water heater, the heating outlet pipe, the circulating water pipe, the heat exchanger, and the heating return pipe are sequentially connected to form a circulating loop; The water pressure sensor is arranged in the heating circuit and / or the circulation circuit, and is used to detect the water pressure of the heating circuit and / or the circulation circuit; The water supply pipe is connected between the heating water return pipe and the water supply end; the water supply valve is arranged on the water supply pipe to control the connection and disconnection between the water supply pipe and the water supply end; The circuit control valve is connected to the circulating water pipe and the heating water outlet pipe, and is used to switch the heating circuit and / or the circulating circuit; The controller is electrically connected to the loop control valve, the water pressure sensor and the water supply valve, and the controller switches the loop control valve and controls the on and off of the water supply valve according to the detection result of the water pressure sensor; The control method comprises the following steps: S1, judging whether to replenish water according to the water pressure P detected by the water pressure sensor, if P is less than the first set pressure P1, executing step S2, otherwise controlling the water replenishment valve to remain closed; S2, switching the circuit control valve so that the heating circuit is connected and the circulation circuit is disconnected, and opening the water supply valve to supply water to the heating circuit; S3, switching the loop control valve so that the circulation loop is connected and the heating loop is disconnected, and opening the water supply valve to supply water to the circulation water circuit; The dual-purpose furnace system further includes a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller; step S2 includes the following steps: S21, opening the water supply valve to supply water to the heating return pipe; S22, comparing the water pressure P detected by the water pressure sensor with the first set pressure P1, if P≥P1, executing step S23; S23, adjusting the circuit control valve so that the heating circuit remains connected and the circulation circuit remains disconnected, and starting the circulation pump to accelerate water replenishment; S24, comparing the water pressure P detected by the water pressure sensor with the second set pressure P2, if P≥P2, closing the water supply valve, and the circulation pump continues to work for the first set time T1; S25, comparing the water pressure P detected by the water pressure sensor with the third set pressure P3, if P≥P3, executing step S3; if P<P3, repeating steps S23 to S24; The dual-purpose furnace system further includes a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller; step S3 includes the following steps: S31, opening the water supply valve to supply water to the heating return pipe; S32, adjusting the loop control valve so that the heating loop remains closed and the circulation loop remains connected, and starting the circulation pump to accelerate water replenishment; S33, comparing the water pressure P detected by the water pressure sensor with the second set pressure P2, if P≥P2, closing the water supply valve, and the circulation pump continues to work for the first set time T1; S34, comparing the water pressure P detected by the water pressure sensor with the third set pressure P3, if P≥P3, turning off the circulation pump, if P<P3, repeating steps S23 to S33.

2. The control method of the dual-purpose furnace system according to claim 1, characterized in that: The loop control valve is a three-way valve having a first port, a second port and a third port, wherein the first port is connected to the heating water outlet pipe, the second port is connected to the circulating water pipe, and the third port is connected to the heating water outlet pipe; The controller controls the first port and the second port to be connected to switch the dual-purpose furnace system to a circulation loop, and the controller controls the first port and the third port to be connected to switch the dual-purpose furnace system to a heating loop.

3. The control method of the dual-purpose furnace system according to claim 1, characterized in that: The water pressure sensor is arranged on the heating water return pipe and is used to detect the water pressure in the heating water return pipe.

4. The control method of the dual-purpose furnace system according to claim 3, characterized in that: When the water pressure sensor detects that the water pressure P is less than the first set pressure P1, the controller switches the circuit control valve so that the heating circuit is connected and the circulation circuit is disconnected, and the controller controls the water supply valve to open to supply water to the heating circuit.

5. The control method of the dual-purpose furnace system according to claim 4, characterized in that: After the water replenishment of the heating circuit is completed, the controller switches the circuit control valve so that the circulation circuit is connected and the heating circuit is disconnected, and the controller controls the water replenishment valve to open to replenish the circulation circuit.

6. The control method of the dual-purpose furnace system according to claim 1, characterized in that: The dual-purpose furnace system further comprises a circulation pump, which is arranged in the heating circuit and / or the circulation circuit, and is electrically connected to the controller; When the water pressure sensor detects that the water pressure P is greater than or equal to the first set pressure P1, the controller controls the circulation pump to start; when the water pressure sensor detects that the water pressure P is greater than or equal to the second set pressure P2, the controller controls the water supply valve to close, and the controller controls the circulation pump to continue working for the first set time T1.

7. The control method of the dual-purpose furnace system according to claim 1, characterized in that: The control method further comprises the following steps: S4, compare the total water replenishment time T with the second set time T2, if T ≥ T2, then issue a water leakage alarm, otherwise execute step S5; S5. Conduct water leakage detection on the dual-purpose furnace system.

8. The control method of the dual-purpose furnace system according to claim 7, characterized in that: Step S5 includes the following steps: S51, recording the water pressure value P0 after the water replenishment is completed, and then recording the water pressure value Pn once every third set time T3; S52, compare each Pn with P0 within the fourth set time T4, where T4>T3, define Pw as a preset water pressure deviation value, and if Pn<P0-Pw, issue a water leakage alarm; otherwise, execute step S53; S53, measuring the water pressure value Pn' which is separated from the measurement time point Pn by a fourth set time T4, and comparing Pn with Pn'. If Pn-Pn'>Pw, a water leakage alarm is issued.

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