CN110836414A - Control method of gas heating and hot water supply equipment - Google Patents

Abstract

The invention discloses a control method of gas heating and hot water supply equipment, wherein the gas heating and hot water supply equipment comprises a gas furnace and a water tank; the control method comprises the following steps: executing a zero cold water heating mode; the zero cold water heating mode includes: and water stored in an external pipeline connected with the gas heating and hot water supply equipment circularly flows into the water tank, is mixed with the water stored in the water tank and then is output to the external pipeline. The water tank is used for heating the stored water in the external water pipe to achieve the function of zero cold water, so that the gas consumption is effectively saved, and the water use experience of a user is improved.

Description

Control method of gas heating and hot water supply equipment

Technical Field

The invention belongs to the technical field of heating stoves, and particularly relates to a control method of gas heating and hot water supply equipment.

Background

At present, gas heating and hot water supply equipment adopts gas as energy to heat water to realize heating, and along with the technical progress, the gas heating and hot water supply equipment can also have the function of supplying domestic hot water for users. For example: chinese patent application No. 201811537311.6 discloses a zero-cold water gas wall-mounted boiler system which can meet the heating requirement in a room on one hand and can also meet the zero-cold water hot water supply on the other hand. However, in the actual use process, in order to realize zero cold water, the cold water in the water outlet pipe needs to be conveyed to the gas furnace from the water return pipe through the water pump for heating, and then conveyed to the water outlet pipe again. However, because the water quantity stored in the water outlet pipe is small, when the water is heated by burning of the gas furnace, the heat generated by burning and heating is far greater than the requirement of the stored water quantity under the influence of the minimum heating power of the gas furnace, and the starting and stopping of the burner of the gas furnace are controlled by detecting whether the heating temperature reaches a set value or not. In the actual use process, in order to keep the temperature of water in a water pipe, the water in the pipe needs to be heated, when the water temperature reaches the preset temperature, the machine does not work, when the water temperature is lower than the preset water temperature, the water pump needs to be ignited again for heating, the water pump is restarted for running, the machine is started repeatedly, the service life of the gas furnace is influenced, and the waste of gas is caused by frequent starting; because the amount of the zero-cold water is small, the temperature is easy to exceed the temperature when the water is heated by combustion, and the temperature difference between the zero-cold water and the temperature to be used is large (suddenly cold and suddenly hot) in the use process of a user, so that uncomfortable water using experience is caused. The invention aims to solve the technical problem of how to design a technology for saving gas consumption and improving water use experience of a user.

Disclosure of Invention

The invention provides a control method of gas heating and hot water supply equipment, aiming at the technical problems in the prior art, in the zero cold water heating process, water stored in an external water pipe is heated or buffered by a water tank, so that the starting and stopping times of a gas furnace are reduced, the fluctuation of the outlet water temperature is reduced, the gas consumption is saved, and the water use experience of a user is improved.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

the invention provides a control method of gas heating and hot water supply equipment, wherein the gas heating and hot water supply equipment comprises a gas furnace and a water tank;

the control method comprises the following steps: executing a zero cold water heating mode;

the zero cold water heating mode includes: and water stored in an external pipeline connected with the gas heating and hot water supply equipment circularly flows into the water tank, is mixed with the water stored in the water tank and then is output to the external pipeline.

Further, the control method further includes: when the zero cold water heating mode is executed for the first time, detecting the initial water temperature T1 of water in the water tank and the initial water temperature T2 of water input by an external pipeline, starting the gas furnace to operate and heat at the set power P until the water temperature of the water in the water tank is detected to rise to T3, recording the heating time T of the gas furnace at the same time, and then calculating the water storage quantity L of the external pipeline.

Further, the control method further includes: and controlling the water flow speed of the external pipeline flowing into the water tank according to the calculated water storage quantity L of the external pipeline.

Further, the controlling of the water flow rate of the external pipeline flowing into the water tank specifically includes: if the water storage quantity L of the external pipeline is larger than a set standard pipeline water quantity value L0, increasing the water flow speed of the external pipeline flowing into the water tank; and if the calculated water storage quantity L of the external pipeline is not more than the set standard pipeline water quantity value L0, reducing the water flow speed of the external pipeline flowing into the water tank.

Further, the set operation time t0 of the zero cold water heating mode;

the control of the water flow speed of the external pipeline flowing into the water tank specifically comprises the following steps: and calculating the water flow speed v of the external pipeline flowing into the water tank according to the water storage quantity L of the external pipeline and the set operation time t0 so as to control the water flow speed of the external pipeline flowing into the water tank.

Further, the zero cold water heating mode further includes: when the water temperature in the water tank is not less than the set outlet water temperature, the water in the external pipeline circularly flows into the water tank, is mixed with the water stored in the water tank and then is output to the external pipeline; when the water temperature in the water tank is lower than the set water outlet temperature, the gas furnace is started, and water in the external pipeline flows into the water tank after being heated by the gas furnace, is mixed with water stored in the water tank and is output to the external pipeline.

Further, the control method further includes: executing a domestic hot water heating mode;

the domestic hot water heating mode includes: under the condition that the water temperature stored in the water tank is not lower than the set water outlet temperature, the gas furnace is in a closed state, and an external water source enters the water tank so that the water tank directly outputs domestic hot water; and under the condition that the temperature of water stored in the water tank is lower than the set water outlet temperature, starting the gas furnace, heating an external water source by the gas furnace, then entering the water tank, and outputting domestic hot water from the water tank.

Further, the domestic hot water heating mode comprises the step of starting the gas furnace under the condition that no domestic hot water is required to be output, if the difference value of the water temperature stored in the water tank and lower than the set water outlet temperature is greater than △ T1, circularly flowing the water in the water tank into the gas furnace to be heated until the water temperature stored in the water tank and higher than the set water outlet temperature is greater than △ T2.

Further, the control method further includes performing a heating water heating mode; the heating water heating mode includes: starting a gas furnace to heat the heating water;

and executing the heating water heating mode under the condition that the return water temperature of the heating water is lower than the set heating temperature.

Furthermore, the heating water heating mode is also implemented under the condition that domestic hot water is not required to be heated through the gas furnace.

Compared with the prior art, the invention has the advantages and positive effects that: by adding the water tank, hot water stored in the water tank is used for conveying domestic hot water to the outside, and when zero cold water is heated, water in the external water pipe enters the water tank through the zero cold water joint, so that the water in the external water pipe is mixed with the hot water stored in the water tank, the effect of reducing the switching times of the gas furnace can be achieved, the gas consumption is saved, and the service life is prolonged; the zero cold water heating process is realized by utilizing the water in the water tank, the condition that a user is scalded by high water temperature due to the fact that zero cold water is output by direct heating is avoided, and the user experience is improved.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of the structural principle of an embodiment of the gas heating and hot water supply device of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a gas heating and hot water supply device of the present invention;

FIG. 3 is a schematic view of a gas-fired heating and water-heating apparatus of the present invention with the outer casing removed;

FIG. 4 is a schematic structural diagram of a water tank in an embodiment of the gas-fired heating and hot water supply apparatus of the present invention;

FIG. 5 is a schematic structural diagram of a water inlet and outlet pipe group in an embodiment of the gas heating and water heating apparatus of the present invention;

FIG. 6 is a schematic structural diagram of a second reversing valve in the embodiment of the gas-fired heating and water-heating apparatus of the present invention;

FIG. 7 is a schematic view illustrating a structure of a heating and hot water supply system according to the present invention;

FIG. 8 is a flow chart of the present invention for performing a domestic hot water heating mode;

FIG. 9 is a control flow chart of a heating and hot water supply system in a bathing mode;

FIG. 10 is a flow chart of the present invention for implementing a zero cold water heating mode.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 6, the gas heating and water heating apparatus of the present embodiment includes: a housing 2, a gas furnace 1, a hot water supply assembly 3 and a heat exchanger 4.

The shell 2 is provided with a heating water outlet joint 21, a heating water return joint 22, a water inlet joint 23, a zero cold water joint 24 and a hot water joint 25. Specifically, the water inlet connector 23 may be connected to an external water supply source (e.g., a tap water pipe) to introduce new cold water; the heating water outlet joint 21 and the heating water return joint 22 are connected with an external heat dissipation terminal to realize the circulating flow of heating water; the hot water joint 25 is used for delivering domestic hot water to the outside.

The gas furnace 1 is provided with a main water outlet 11 and a main water inlet 12, and the gas furnace 1 is used for burning gas to heat water input from the main water inlet 12 and output hot water from the main water outlet 11. The gas stove 1 is also provided with a burner 13, a heat exchanger 14 and other components, the water is input into the heat exchanger 14 from the main water inlet 12, the burner 13 can heat the water in the heat exchanger 14 by burning gas, and the water heated by the heat exchanger 14 is output through the main water outlet 11. Here, the specific configuration of the gas furnace 1 will not be described in detail. The heating water outlet joint 21 is used for delivering the hot water output from the main water outlet 11 to a heat dissipation terminal (for example, a ground heating pipe or a radiator) arranged in a user room, and the water output from the heat dissipation terminal flows back to the heat exchanger 14 through the heating water return joint 22. In order to increase the circulation speed of the heating water, a heating pump 20 is disposed in a heating water loop formed by a heating water outlet joint 21, a heating water return joint 22 and a heat dissipation terminal, and the circulation flow of the water in the heating water loop is accelerated by the heating pump 20. The heating pump 20 may be integrated into the gas heating and water heating device, or may be independent of the gas heating and water heating device.

The hot water supply unit 3 is provided with a water tank 31 and a water pump 32. Specifically, the hot water in the water tank 31 is delivered to the outside through the hot water joint 25, and the hot water delivered from the hot water joint 25 is delivered to a hot water delivery terminal (for example, a shower head or a hot water faucet) through a water supply pipe disposed in the home of the user. The water return pipe connected to the water supply pipe for realizing the zero-cold-water function is connected to the zero-cold-water joint 24, and the specific connection mode between the water supply pipe and the water return pipe is not limited or described herein, referring to the gas water heating device with the zero-cold-water function in the conventional technology.

The heat exchanger 4 is provided with a first heat exchange flow path 41 and a second heat exchange flow path 42 which can exchange heat with each other.

The main water outlet 11 is selectively connected with an inlet of a heating water outlet joint 21 or a first heat exchange flow channel 41, and outlets of a heating water return joint 22 and the first heat exchange flow channel 41 are respectively connected with the main water inlet 12; the water inlet joint 23, the hot water joint 25 and the second heat exchange flow passage 42 are respectively connected with the water tank 31, and the zero-cold water joint 24 is connected with the water tank 31 through the water pump 32. Specifically, the burner 13 in the gas stove 1 heats the water in the heat exchanger 14 and outputs the water through the main water outlet 11. The hot water output from the main water outlet 11 can be directly delivered to the heating water outlet joint 21 for heating, and the hot water output from the main water outlet 11 can also be delivered to the heat exchanger 4. And the water in the water tank 31 can be circulated to the heat exchanger 4 to be heated, so as to ensure that enough hot water is stored in the water tank 31. Cold water supplemented from an external water source is introduced into the water tank 31 from the water inlet joint 23 to output hot water in the water tank 31, and hot water in the water tank 31 is output to the outside through the hot water joint 25 to supply domestic hot water. The zero cold water junction 24 can input cold water in a water supply pipe and a water return pipe into the water tank 31 through the water pump 32 to perform a function of zero cold water by mixing hot water in the water tank 31 with cold water.

The gas heating and water heating device executes the zero cold water heating mode.

As shown in fig. 10, in the zero cold water heating mode, water in an external water return pipe connected to a zero cold water joint enters a water tank of the gas heating and hot water supplying apparatus, and water introduced from the zero cold water joint is mixed with hot water stored in the water tank and is output from a hot water joint. Specifically, in the zero cold water heating mode, cold water in the external water return is drawn into the appliance by the water pump and water will flow into the tank to mix with hot water in the tank. Thus, after a period of circulating flow, the temperature of the water in the external water pipe of the device can be raised to the temperature set by the device.

Wherein, the water in the related external water return pipe can directly enter the water tank after being introduced through the zero cold water joint so as to be mixed with the hot water in the water tank. Or the water introduced from the zero cold water joint is heated by the gas furnace, enters the water tank and is mixed with the water in the water tank and then is output. The concrete description is as follows:

and S301, when the water temperature in the water tank is not less than the set outlet water temperature, circularly flowing the water in the external pipeline into the water tank, mixing the water with the water stored in the water tank, and outputting the mixed water to the external pipeline. Specifically, in the zero-cold-water mode, when the water storage temperature in the water tank is higher than the set water outlet temperature, the zero-cold-water function is realized, and the cold water in the external pipeline can be heated to the temperature set by the user through the hot water in the water tank. In this case, the water in the external pipe return enters the water tank through the zero cold water joint without being heated, and the effect of zero cold water is achieved by mixing with the hot water in the water tank. The heating of the zero cold water is realized by the hot water in the water tank, so that the gas furnace does not need to be started, the starting times of the gas furnace can be reduced, and the purpose of reducing the gas consumption is achieved.

Step S302, when the water temperature in the water tank is lower than the set water outlet temperature, the gas furnace is started, and water in the external pipeline flows into the water tank after being heated by the gas furnace, is mixed with water stored in the water tank and then is output to the external pipeline. Specifically, when the water storage temperature in the water tank is lower than the set water outlet temperature, the function of zero cold water cannot be directly achieved by heating the cold water in the external pipeline with the hot water stored in the water tank, and therefore, the function of zero cold water by starting the gas stove to heat the cold water in the introduced external pipeline is required. In this case, the water in the external pipe return pipe enters the gas furnace through the zero-cold water joint to be heated, and then the heated water flows into the water tank again to achieve the effect of zero-cold water by mixing with the hot water in the water tank. In the process of heating zero-cold water by the gas furnace, the heated water firstly enters the water tank to be mixed, and is not directly output. Like this, alright take place with avoiding out the phenomenon that the water temperature is too high and scald the user, more be favorable to improving the constant temperature degree of outlet water temperature, optimize user experience nature.

Preferably, the length of the external piping connecting the devices in the homes differs from user to user, in order to complete the zero cold water heating process within a defined time. After the device is installed in the home of a user, when the zero cold water heating mode is executed for the first time, a self-learning mode is needed to acquire the water quantity stored in the external pipeline of the device, and the specific process is as follows.

When the zero cold water heating mode is executed for the first time, detecting the initial water temperature T1 of water in the water tank and the initial water temperature T2 of water input by an external pipeline, starting the gas furnace to operate and heat at the set power P until the water temperature of the water in the water tank is detected to rise to T3, recording the heating time T of the gas furnace at the same time, and then calculating the water storage quantity L of the external pipeline. Specifically, the length of the external pipeline connecting the hot water output terminal and the equipment in each user's home is determined after the installation is completed, and correspondingly, the amount of water in the external pipeline to be heated in the zero-cold-water mode is also fixed. The water storage capacity of the water tank in the equipment is fixed, and the water storage capacity can be recorded according to the formula by measuring the water temperature T1 of the water tank, the water inlet temperature T2 of the zero cold water joint 24 and the time T for heating the water in the water tank and the external pipeline to the temperature T3 by set power: the quantity of water stored in the external pipeline can be calculated by the heat quantity Q = C × M × T = P × T (wherein C is the specific heat capacity of water, M is the mass of water, and T is the temperature rise degree). Therefore, in the zero-cold-water mode, the water flow speed can be adjusted according to the water storage capacity of the external pipeline in the house of different users, so that the heating operation of the zero-cold water is completed within a specified time.

The specific operation is as follows: and controlling the water flow speed of the external pipeline flowing into the water tank according to the calculated water storage quantity L of the external pipeline. Specifically, if the water storage quantity L of the external pipeline is greater than a set standard pipeline water quantity value L0, the water flow speed of the external pipeline flowing into the water tank is increased; and if the calculated water storage quantity L of the external pipeline is not more than the set standard pipeline water quantity value L0, reducing the water flow speed of the external pipeline flowing into the water tank. After the actual amount of stored water L is calculated in the user's home by setting a standard amount of water L0 in the apparatus before shipment from the factory, the flow rate of the zero-cooling water is adjusted by comparing the magnitudes of L and L0. That is, when L is greater than L0, the rotation speed of the water pump is increased to increase the flow rate of the zero-cold water, so that the heating speed of the zero-cold water can be increased, and the zero-cold water mode is completed within a set time.

Likewise, the set run time t0 of the zero cold water heating mode. Then, for controlling the water flow rate of the external pipeline flowing into the water tank, specifically: and calculating the water flow speed v of the external pipeline flowing into the water tank according to the water storage quantity L of the external pipeline and the set operation time t0 so as to control the water flow speed of the external pipeline flowing into the water tank. Specifically, in the zero cold water mode, the heat for heating the stored water in the external pipeline to the set temperature within the time t0 can be known according to the temperature of the water tank and the water inlet temperature of the zero cold water joint. The number of times of circulation flow is known from the quantity of heat required to heat the stored water quantity L of the external pipe and the quantity of heat exchange that can be generated by one time of circulation flow, based on the calculated quantity of heat, and the quantity of heat exchange generated by one time of circulation flow of water between the tank and the external pipe is constant, and thus the water speed is calculated from t0 and the number of times of circulation, thereby controlling the operation of the water pump.

In addition, as the gas stove 1 and the water tank 31 are arranged in the housing 1, in order to facilitate assembly and installation in the home of a later user, a plurality of hanging jacks 201 are arranged on the side wall of the housing 2, a first inserting tongue 101 and a fixing bracket 102 are arranged on the gas stove 1, the water tank 31 is provided with a hanging bracket 311, a second inserting tongue 312 is formed on the hanging bracket 311, the first inserting tongue 101 and the second inserting tongue 312 are respectively inserted into the corresponding hanging jacks 201, and the fixing bracket 102 and the hanging bracket 311 are fixed on the housing 2 through screws. Specifically, in the assembly stage of a factory, the gas furnace 1 and the water tank 31 are hung on the back plate of the housing 1 through corresponding inserting tongues, so that the rapid positioning and assembly on site are facilitated; then, the gas burner 1 and the water tank 31 are firmly fixed to the housing 1 by screws to complete the assembly of the whole apparatus. When the casing 1 is installed and used in the home of a later user, the casing only needs to be installed in the home of the user integrally to realize one-time integral installation.

Further, the water tank 31 has a first water port (not labeled), a second water port (not labeled) and a third water port (not labeled), the first water port is connected to the hot water connector 25, an outlet of the second heat exchange flow passage 42 is connected to the second water port, and an outlet of the water pump 32, the water inlet connector 23 and an inlet of the second heat exchange flow passage 42 are selectively connected to the third water port as needed. Specifically, in the process of normally supplying domestic hot water, hot water in the water tank 31 is output through the first water port and flows to the hot water joint 25 to realize external supply of hot water, and when the water tank 31 supplies domestic hot water to the outside, the water tank 31 is communicated with the third water port through the water inlet joint 23 to introduce an external water source into the water tank 31; in the zero-cold-water mode, after the water pump 32 is started, water in the water return pipe is pumped into the water tank 31 through the zero-cold-water joint 24 and is mixed with hot water in the water tank 31 to realize the zero-cold-water function. In addition, when the water temperature in the water tank 31 is low and needs to be heated, the inlet of the second heat exchange flow passage 42 is communicated with the third water port, the gas furnace 1 and the water pump 32 are started simultaneously, and the water in the water tank 31 circularly flows into the heat exchanger 4 to realize heating.

Still further, the main water outlet 11 is connected with a first reversing valve 5, one outlet of the first reversing valve 5 is connected with the heating water outlet joint 21, and the other outlet of the first reversing valve 5 is connected with the inlet of the first heat exchange flow channel 41; the third water port is connected with a second reversing valve 6, the water inlet joint 23 and the third water port are connected to the same port of the second reversing valve 6, the other port of the second reversing valve 6 is connected with a zero cold water joint 24, and the other port of the second reversing valve 6 is connected with an inlet of a second heat exchange flow channel 42. Specifically, in the actual use process, the high-temperature water output from the main water outlet 11 is controlled by the first reversing valve 5. When water is needed for heating, the first reversing valve 5 is switched to enable the main water outlet 11 to be communicated with the heating water outlet joint 21, so that high-temperature water output by the main water outlet 11 is directly conveyed to the heat dissipation terminal through the heating water outlet joint 21, and is returned to the gas furnace 1 through the main water inlet 12 after being dissipated by the heat dissipation terminal. When the domestic hot water needs to be heated, the first reversing valve 5 is switched to enable the main water outlet 11 to be communicated with the first heat exchange flow channel 41, so that the water in the water tank 31 is heated through the heat exchanger 4, and the domestic hot water is conveyed outwards.

Optionally, in order to increase the water yield of the domestic hot water, when the amount of hot water stored in the water tank 31 is insufficient, the requirement of the user on the domestic hot water can still be met, the second directional valve 6 includes an electrically controlled three-way valve 61 and a three-way pipe 62, the electrically controlled three-way valve 61 has a first connection port, a second connection port and a third connection port, the first connection port is selectively communicated with the second connection port or the third connection port, and the three-way pipe 62 is connected with the second connection port; the third water inlet and the water inlet joint 23 are respectively connected with the three-way pipe 62, the first connecting port is connected with the second heat exchange flow channel 42, and the zero cold water joint 24 is connected with the third connecting port. Specifically, the electrically controlled three-way valve 61 can meet the function of switching the connection between the zero cold water joint 24, the third water port and the water inlet joint 23 corresponding to the second heat exchange flow passage 42; and the three-way pipe 62 can meet the requirement that the third water gap and the water inlet joint 23 are communicated with the second connector of the electric control three-way valve 61 respectively, and can also meet the requirement that the third water gap and the water inlet joint 23 are communicated. In practical use, when a large amount of domestic hot water is needed and the hot water in the water tank 31 cannot meet the requirement, the gas furnace 1 is started, the first reversing valve 5 is switched to enable the main water outlet 11 to be communicated with the first heat exchange flow channel 41, cold water introduced by the water inlet joint 23 directly enters the second heat exchange flow channel 42 to be heated and then enters the water tank 31, and the domestic hot water is output from the first water port.

Preferably, the second direction valve 6 further comprises a four-way pipe 63, an expansion tank (not shown) and an exhaust valve 64, and corresponding pipe orifices of the four-way pipe 63 are respectively connected with the exhaust valve 64, the expansion tank, the first connection port and an inlet of the second heat exchange flow channel 42. Specifically, the four-way pipe 63 can meet the installation requirements of relevant components, so as to realize more compact overall structure. And the water pump 34 may be connected between the inlet of the second heat exchange flow passage 42 and the cross pipe 63; alternatively, the water pump 34 may be connected between the outlet of the second heat exchange flow passage 42 and the second water port.

When in actual use, the gas heating and hot water supply device comprises: a tank water supply mode and an instant heating water supply mode. In the tank water supply mode, if the temperature sensor in the tank 31 detects that the temperature of the water in the tank 31 is higher than the set temperature, the second direction valve 6 cuts off the flow path between the third water port and the second heat exchange flow path 42, and the water inlet joint 23 is communicated with the third water port of the tank 31, so that when a user uses hot water, cold water output from the water inlet joint 23 directly enters the tank 31, hot water in the tank 31 is squeezed out, and the hot water is output from the hot water joint 25.

In the process of using water, when the temperature sensor in the water tank 31 detects that the temperature of the water tank 31 is lower than the set temperature, the instant hot water supply mode is started.

In the instant water supply mode, the second reversing valve 6 switches the water inlet joint 23 to be communicated with the second heat exchange flow channel 42, the gas furnace 1 and the water pump 32 are started, water output by the water inlet joint 23 enters the second heat exchange flow channel 42 to be heated, then enters the water tank 31 and is output from the hot water joint 25, and instant water supply is achieved. And because the cold water introduced by the water inlet joint 23 has a certain water pressure, the water in the water tank 31 can be prevented from flowing out from the third outlet in the instant hot water supply mode.

When the user does not use hot water, the water stored in the water tank 31 needs to be heated, and in this case, in order to ensure that the water in the water tank 31 can be circulated into the heat exchanger 4 and to prevent the external water from entering through the water inlet joint 23, the water inlet joint 23 may be provided with a control valve 231. When the water in the water tank 31 needs to be heated, the second direction changing valve 6 communicates the flow path between the second heat exchanging flow passage 42 and the third water gap of the water tank 31, and the water inlet joint 23 is closed through the control valve 231, and then the gas furnace 1 and the water pump 32 are started. The water in the water tank 31 is conveyed to the second heat exchange flow passage 42, heated and returned to the water tank 31, and the combustion heating is stopped until the water in the water tank 31 reaches the set temperature, so that the whole machine enters a standby state, and the heat of the water tank 31 is preserved.

In order to prevent hot water from being output from the zero-cold water joint 24 in the instantaneous water supply mode, a check valve 241 may be disposed at an outlet of the zero-cold water joint 2, so that water can be sequentially supplied and drained in a water path, and system reliability can be improved.

The specific process of the gas furnace 1 for heating water and supplying the water to the heating assembly 2 for outputting hot water refers to a gas heating furnace of the conventional technology, and is not limited and described herein. The specific process of the gas furnace 1 in the process of heating the domestic water of the user is as follows: in the zero cold water mode, when the temperature of water in the water supply pipe is lower than a set temperature, the zero cold water heating function is activated, and at this time, the second direction valve 6 is switched so that the zero cold water joint 24 communicates with the water tank 21. When the zero-cold water is heated, under the action of the water pump 32, water in the water supply pipe enters the water tank 31 through the zero-cold water joint 24 to circularly flow until the temperature of the water in the water supply pipe reaches a set temperature.

Based on the above technical solution, optionally, in order to utilize the hot water in the water tank 31 to the maximum, the water tank 31 includes: the heat preservation tank 311, the hot water outlet pipe 312, the circulating water pipe 313 and the water inlet and outlet pipe 314, wherein a water storage cavity is formed inside the heat preservation tank 311; the hot water outlet pipe 312 is inserted into the heat preservation tank 311 and is used for outputting water in the upper area in the water storage cavity, and a pipe orifice of the hot water outlet pipe 312 positioned outside the heat preservation tank 311 forms a first water port; the circulating water pipe 313 is inserted into the heat preservation tank 311 and is used for supplying water to the upper area in the water storage cavity, and a pipe orifice of the circulating water pipe 313 positioned outside the heat preservation tank 311 forms a second water port; the water inlet and outlet pipe 314 is inserted into the heat preservation tank 311, the water inlet and outlet pipe 314 is used for supplying water to the lower area in the water storage cavity, the water inlet and outlet pipe 314 is also used for outputting water in the lower area in the water storage cavity, and a pipe orifice of the water inlet and outlet pipe 314, which is positioned outside the heat preservation tank 311, forms a third water opening. Specifically, a hot water outlet pipe 312, a circulating water pipe 313 and a water inlet and outlet pipe 314 are inserted into the heat preservation tank 311, the hot water outlet pipe 312 is used for outputting hot water in the water tank 31 to supply hot water for users, the circulating water pipe 313 is used for circulating water to flow, and the water inlet and outlet pipe 314 is used for supplying water to the water tank 31 and outputting and heating water in the water tank 31 to meet the requirement of rapidly heating water stored in the water tank 31. Thus, the water tank 31 can effectively meet the requirement of the user for using hot water, so that the hot water in the water tank 31 can be utilized to the maximum extent to heat zero-cold water or supply hot water to the outside.

Wherein, the bottom of the heat-preserving tank 311 is provided with a mounting port; the water tank 31 further comprises a sealing cover 315, the sealing cover 315 is hermetically connected to the mounting port, and the hot water outlet pipe 312, the circulating water pipe 313 and the water inlet and outlet pipe 314 are hermetically penetrated through the sealing cover 315. Specifically, the hot water outlet pipe 312, the circulating water pipe 313, and the water inlet/outlet pipe 314 are installed on the sealing cover 315, and then, the assembly is completed from the bottom of the thermal insulation tank 311 through the sealing cover 315. And the hot water outlet pipe 312, the circulating water pipe 313 and the water inlet and outlet pipe 314 are vertically arranged. In order to reduce the fluctuation range of the water temperature output by the hot water output pipe 312, the upper end of the circulating water pipe 313 is a closed structure, the pipe wall of the upper end of the circulating water pipe 313 is provided with a plurality of water outlet holes 3131, the water outlet holes 3131 are distributed on the pipe wall of the circulating water pipe 313, and the hot water output from the water outlet holes 3131 can be dispersed into the thermal insulation tank 311 to be effectively mixed with the water in the thermal insulation tank 311 so as to buffer the fluctuation of the water temperature in the thermal insulation tank 311. Meanwhile, the upper end of the hot water outlet pipe 312 is in an open structure and forms a hot water inlet 3121, the height of the hot water inlet 3121 is not lower than that of the water outlet 3131, and the hot water inlet 3121 can ensure that water in the heat-insulating tank 311 is uniformly mixed and then output. In order to increase the hot water output rate, the upper end of the water inlet/outlet pipe 314 is of a closed structure, the wall of the upper end of the water inlet/outlet pipe 314 is provided with a plurality of water through holes 3141, and when cold water is injected into the thermal insulation tank 311, the water through holes 3141 can disperse the cold water to the bottom of the thermal insulation tank 311, so that the impact on the hot water at the upper part of the thermal insulation tank 311 is reduced, and the hot water output rate is increased.

In order to detect the temperature of the water in the thermal insulation tank 311 so that the temperature of the thermal insulation tank 311 can be controlled, a first temperature sensor may be provided on the sealing lid 315 and/or a second temperature sensor may be provided on the upper portion of the thermal insulation tank 311, as required. Specifically, the first temperature sensor can detect the temperature of the incoming water at the bottom of the thermal insulation tank 311, and the second temperature sensor can detect the temperature of the outgoing water at the top of the thermal insulation tank 311.

In addition, the representation entity of the first direction valve 5 may be implemented by an electric control valve such as a two-position three-way valve, which is not limited herein. In order to control the opening and closing of the water passage, control valves may be disposed at the heating water outlet joint 21, the heating water return joint 22, and the water inlet joint 23 as needed to control the opening and closing of the water passage.

Based on the above gas heating and water supplying device, the present invention further provides a heating and water supplying system, as shown in fig. 7, the heating and water supplying system includes a gas heating and water supplying device 100, a hot water output terminal 300 and a heat dissipating terminal 200, wherein the heating water outlet joint 21 and the heating water return joint 22 of the gas heating and water supplying device 100 are connected to the heat dissipating terminal 200, the hot water joint 25 of the gas heating and water supplying device 100 is connected to the hot water output terminal 300, and the water inlet joint 23 of the gas heating and water supplying device 100 can be connected to a water pipe at home of a user.

In actual use, the gas heating and water heating apparatus 100 at least has the following heating modes: the domestic hot water heating mode and the heating water heating mode are explained in detail below with respect to different heating modes.

In the case where the gas heating and hot water supplying apparatus 100 performs the domestic hot water heating mode.

As shown in fig. 8, in step S101, when the temperature of the water stored in the water tank is not lower than the set outlet water temperature, the gas stove is in a closed state, and the external water source enters the water tank to directly output the hot water in the water tank to the hot water output terminal. Specifically, when the temperature sensor in the water tank detects that the temperature of the hot water stored in the water tank is not lower than the set outlet temperature, the hot water stored in the water tank can meet the temperature requirement of the domestic hot water required by the user, and when the user needs to use the domestic hot water, an external water source (such as tap water) directly enters the bottom of the water tank through the water inlet joint 23, so that the hot water at the top in the water tank is output to the hot water output terminal 300 from the hot water joint 25.

And S102, starting a gas furnace under the condition that the temperature of water stored in the water tank is lower than the set water outlet temperature, heating an external water source by the gas furnace, then entering the water tank, and outputting hot water from the water tank to a hot water output terminal. Specifically, after the hot water in the water tank is used for a period of time, more cold water is injected into the water tank, so that the overall water temperature of the water tank is reduced. When the temperature of the water stored in the water tank is lower than the set water outlet temperature, the gas furnace is started and the water pump is started correspondingly, so that an external water source is heated by the gas furnace and then conveyed to the top of the water tank, and the hot water at the top in the water tank is output to the hot water output terminal 300 from the hot water joint 25.

Preferably, in the actual use process, under the condition that no domestic hot water output requirement exists, if the difference value of the water temperature stored in the water tank and lower than the set outlet water temperature is greater than △ T1, the gas furnace is started, the water in the water tank circularly flows into the gas furnace to be heated until the water temperature stored in the water tank and higher than the set outlet water temperature is greater than △ T2. specifically, under the condition that a user does not use domestic hot water, the temperature of the hot water in the water tank is reduced due to heat dissipation, the water in the water tank is lower than the set outlet water temperature and has the temperature difference greater than △ T1, the gas furnace is started, the water pump is started correspondingly and matched, the water in the water tank circularly outputs and is heated by the gas furnace and then flows back to the water tank under the action of the water pump, and when the water temperature in the water tank is raised and is higher than the set outlet water temperature △ T2, the gas furnace and the water pump are stopped.

In the case where the gas heating and water heating apparatus 100 performs the heating water heating mode.

In the heating water heating mode, when the return water temperature of the heating return water joint 22 is lower than the set heating temperature, the gas furnace is started to heat the return water introduced by the heating return water joint 22 under the condition that domestic hot water is not required to be heated by the gas furnace. Specifically, the heating water flows into the heat dissipation terminal 200 to heat the user's home, and when the return water temperature of the heating water is lower than the set heating temperature, the gas furnace needs to be started to heat the heating water. After the heating water in the heat dissipation terminal 200 enters the gas furnace from the heating return water joint 22 to be heated, the hot heating water is output to the heat dissipation terminal 200 through the heating water outlet joint 21.

When the domestic hot water and the heating water are both required to be heated through the gas furnace in the actual use process of a user, the domestic hot water is preferentially heated through the gas furnace. In the process of executing the heating water heating mode, the gas furnace heats the heating water so that the return water temperature of the heating return water joint 22 is lower than the set heating temperature, and the gas furnace is started to heat the heating water when the two conditions are met.

Preferably, during the actual use process of the user, especially during the bathing, the gas-fired heating and water-heating apparatus 100 will alternately perform the domestic hot water heating mode and the heating water heating mode according to the requirement. In order to improve the bathing experience of the user when bathing, the hot water output terminal 300 at least comprises a shower arranged in a bathroom, and the heat dissipation terminal 200 at least comprises a first radiator 201 arranged in the bathroom and a second radiator 202 arranged outside the bathroom; as shown in fig. 9, a specific control method for a heating and hot water supply system includes: after the shower is turned on in step S201, the flow rate of the heating water flowing into the first radiator 201 is increased, and the flow rate of the heating water flowing into the second radiator 202 is decreased.

Specifically, when a user bathes in the bathroom, the initial bathing stage exists, the temperature in the bathroom is low, the body feeling of the user is easy to be cold, when the bathing is finished, the temperature in the bathroom is high, the temperature difference between the bathroom and an external room is large, and the body feeling of the user after the user leaves the bathroom is still cold. By adopting the control mode, when a user bathes, the heating water flow of the first radiator 201 in the bathroom is increased in the initial stage, so that the temperature in the bathroom can be effectively increased.

In the initial bathing stage, the user can rapidly and efficiently increase the overall temperature in the bathroom through the first radiator 201, so that the poor experience that the body feeling temperature is low in the initial bathing stage of the user is reduced, and the experience of the user in the initial bathing stage is effectively improved.

As the bath time is prolonged, the temperature in the bathroom is further increased by the bath hot water, and when the cumulative shower water outlet time exceeds the first set time period t1, the heating water flow flowing into the first radiator 201 is decreased to the first rated flow, and the heating water flow flowing into the second radiator 202 is increased to the second rated flow in step S202. Specifically, after the user bathes for a period of time, the temperature in the bathroom is gradually increased, and the sensible temperature of the user is also increased, so that the first radiator 201 does not need to be provided with large-flow heating water. Thus, the first radiator 201 and the second radiator 202 can be made to normally supply the heating water. The rated flow rates of the corresponding first radiator 201 and the second radiator 202 are the corresponding flow rates of different radiators finally determined by the user according to the set temperature at home. For example: under the condition of normal heating, the set temperature of the home of the user is 25 degrees, taking the first radiator 201 as an example, the heating water flow of the first radiator 201 is adjusted until the temperature in the bathroom reaches 25 degrees, and at this time, the heating water flow of the first radiator 201 is the first rated flow; similarly, the second rated flow obtaining process of the second radiator 202 is the same as the first rated flow obtaining process, and is not described herein again.

And at the end of bathing, in order to reduce the temperature difference felt by the user when the user goes out of the bathroom, the control method further comprises the following steps: step S203, when the accumulated water outlet time of the shower exceeds a second set time t2, reducing the flow rate of the heating water circularly flowing into the first radiator 201 again, and increasing the flow rate of the heating water circularly flowing into the second radiator 202 again; wherein t1< t 2. Specifically, when the bathing time of the user reaches the time length t2, the temperature of the room outside the bathroom needs to be raised in advance. At this time, the flow rate of the heating water in the first radiator 201 is further reduced, and more heating water is supplied to the second radiator 202. And because the user is still in the bathing state, the temperature in the bathroom can be ensured not to be reduced too fast through the shower which still outputs hot water in the bathroom, and the temperature can be kept to be adjusted at a higher temperature. Meanwhile, the second radiator 202 obtains a larger flow of heating water, so that the temperature of the room outside the bathroom is rapidly raised. Therefore, after the user takes the bathroom after bathing, the temperature difference between the inside and the outside of the bathroom is small, and the discomfort of the user can be effectively reduced.

Among them, there are various ways of controlling the flow rate of heating water in the radiator, for example: the radiator is provided with a flow regulating valve for regulating flow, and the flow of the radiator is correspondingly regulated through the flow regulating valve. Taking the first radiator 201 as an example, when the flow rate of the heating water of the first radiator 201 needs to be increased, the opening degree of the flow regulating valve on the first radiator 201 is increased to increase the flow rate of the heating water; on the contrary, the opening degree of the flow rate adjustment valve on the first radiator 201 is decreased to decrease the flow rate of the heating water.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A control method of gas heating hot water supply equipment is characterized in that the gas heating hot water supply equipment comprises a gas furnace and a water tank;

the control method comprises the following steps: executing a zero cold water heating mode;

the zero cold water heating mode includes: and water stored in an external pipeline connected with the gas heating and hot water supply equipment circularly flows into the water tank, is mixed with the water stored in the water tank and then is output to the external pipeline.

2. The control method of the gas-fired heating and hot water supply apparatus according to claim 1, further comprising: when the zero cold water heating mode is executed for the first time, detecting the initial water temperature T1 of water in the water tank and the initial water temperature T2 of water input by an external pipeline, starting the gas furnace to operate and heat at the set power P until the water temperature of the water in the water tank is detected to rise to T3, recording the heating time T of the gas furnace at the same time, and then calculating the water storage quantity L of the external pipeline.

3. The control method of the gas-fired heating and hot water supply apparatus according to claim 2, further comprising: and controlling the water flow speed of the external pipeline flowing into the water tank according to the calculated water storage quantity L of the external pipeline.

4. The control method of the gas-fired heating and water-heating device according to claim 3, wherein the controlling of the flow rate of the water flowing into the water tank from the external pipeline comprises: if the water storage quantity L of the external pipeline is larger than a set standard pipeline water quantity value L0, increasing the water flow speed of the external pipeline flowing into the water tank; and if the calculated water storage quantity L of the external pipeline is not more than the set standard pipeline water quantity value L0, reducing the water flow speed of the external pipeline flowing into the water tank.

5. The control method of the gas-fired heating and hot water supply device according to claim 3, wherein the set operation time t0 of the zero cold water heating mode;

the control of the water flow speed of the external pipeline flowing into the water tank specifically comprises the following steps: and calculating the water flow speed v of the external pipeline flowing into the water tank according to the water storage quantity L of the external pipeline and the set operation time t0 so as to control the water flow speed of the external pipeline flowing into the water tank.

6. The control method of a gas heating and hot water supply apparatus according to claim 1, wherein the zero cold water heating mode further includes: when the water temperature in the water tank is not less than the set outlet water temperature, the water in the external pipeline circularly flows into the water tank, is mixed with the water stored in the water tank and then is output to the external pipeline; when the water temperature in the water tank is lower than the set water outlet temperature, the gas furnace is started, and water in the external pipeline flows into the water tank after being heated by the gas furnace, is mixed with water stored in the water tank and is output to the external pipeline.

7. The control method of the gas-fired heating and hot water supply apparatus according to claim 1, further comprising: executing a domestic hot water heating mode;

the domestic hot water heating mode includes: under the condition that the water temperature stored in the water tank is not lower than the set water outlet temperature, the gas furnace is in a closed state, and an external water source enters the water tank so that the water tank directly outputs domestic hot water; and under the condition that the temperature of water stored in the water tank is lower than the set water outlet temperature, starting the gas furnace, heating an external water source by the gas furnace, then entering the water tank, and outputting domestic hot water from the water tank.

8. The control method of the gas-fired heating and water heating equipment according to claim 7, wherein the domestic hot water heating mode comprises that in the case of no domestic hot water output requirement, if the difference value of the water temperature stored in the water tank lower than the set outlet water temperature is greater than △ T1, the gas furnace is started, and the water in the water tank circularly flows into the gas furnace to be heated until the difference value of the water temperature stored in the water tank higher than the set outlet water temperature is greater than △ T2.

9. The control method of a gas-fired heating and hot water supply apparatus according to claim 1, further comprising performing a heating water heating mode; the heating water heating mode includes: starting a gas furnace to heat the heating water;

and executing the heating water heating mode under the condition that the return water temperature of the heating water is lower than the set heating temperature.

10. The control method of a gas-fired heating and hot water supply apparatus according to claim 9, wherein the heating water heating mode is also performed without heating domestic hot water through a gas furnace.

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