Condensate water recovery device of gas water heater, gas water heater and control method

Abstract

The invention relates to the technical field of gas water heaters, in particular to a condensate water recovery device of a gas water heater, the gas water heater and a control method, and aims to solve the problems that an existing condensation type gas water heater is large in size and condensate water recovery is not smooth. The condensate water recovery device provided by the invention comprises a water collection part, a water storage part and a water recovery part, wherein the water collection part is provided with a water collection cavity; the pipe set comprises a main pipeline and a bypass pipeline, the bypass pipeline and the main pipeline are arranged in parallel and share an inlet and an outlet, the inlet and the outlet of the pipe set are suitable for being connected to a water inlet pipe of the gas water heater in series, the bypass pipeline comprises a Venturi pipe section, the Venturi pipe section is provided with an injection inlet, and the injection inlet is communicated with the outlet of the water collecting part; and the valve is arranged at the inlet of the pipe group, and the valve is arranged to be selectively communicated with the bypass pipeline or the main pipeline. According to the condensate water recovery device of the gas water heater, the structure is simple, condensate water recovery is smooth, the internal structure is more compact, and miniaturization design of the gas water heater is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and specifically provides a condensate recovery device for a gas water heater, a gas water heater, and a control method. Background Art

[0002] Household gas water heaters / gas wall-mounted boilers are divided into condensing and non-condensing types. In order to prevent condensed water from appearing in the flue and then flowing back into the burner, the exhaust temperature of the non-condensing type can reach more than 150°C, causing energy waste. Condensing gas water heaters can make full use of the waste heat of flue gas to improve thermal efficiency and reduce energy consumption, but will produce a large amount of condensed water. According to the temperature set by the user, the pressure of the tap water pipeline, the temperature of the tap water and other factors, the condensed water output during user use can reach up to 0.5L / hour. In addition, since the exhaust gas generated by combustion will dissolve in the condensed water and acidify the condensed water, it is necessary to set up a special condensed water discharge interface and reserve a drainage channel for condensed water during decoration. However, most users do not reserve a drainage channel for condensed water during decoration, and the external drainage pipe method will affect the installation effect of the gas stove, thereby reducing the product experience.

[0003] In order to solve the drainage problem of condensed water, some water heaters collect condensed water and reheat it to vaporize it (including electric heating after collection, and leading the condensed water to the combustion chamber and reheating it with high-temperature flue gas), and then connect it to the flue to discharge it to the outside. This method increases energy consumption, and is prone to freezing when the outdoor temperature is low, posing a safety hazard.

[0004] As an improvement, the patent document with publication number CN112797627A provides a condensing gas water heater, which includes a burner, a heat exchanger, a fan, a condenser, an inlet pipe and an outlet pipe. The condenser is connected to the condensate treatment unit through a first return pipe, and the condensate treatment unit is connected to the inlet pipe through a second return pipe. A one-way valve is arranged between the second return pipe and the inlet pipe. The condensate treatment unit and the one-way valve are electrically connected to the controller respectively; when the pH value of water in the condensate treatment unit is ≥ a preset value, the controller controls the one-way valve to open, and the water in the condensate treatment unit can flow into the inlet pipe in one direction; when the pH value of water in the condensate treatment unit is < a preset value, the controller controls the one-way valve to close. This technical solution can achieve the purpose of condensate recycling and reuse to a certain extent, and can indicate whether the filtering function of the filter element is normal, which is conducive to saving water resources and reducing energy consumption. However, in this solution, since there is no power device on the condensate recovery pipeline, the condensate is only forced to flow in the pipeline by the deadweight of the water in the condensate treatment unit. Under the obstruction of the water inlet pressure in the water inlet pipe, it is necessary to ensure that the condensate treatment unit has a large enough capacity and strong filtering performance, and the condensate treatment unit needs to be installed at a position with a sufficient height difference from the tee position, which limits the installation position of the condensate treatment unit and makes the structure of the entire water system loose and not compact, which leads to the problems of large overall size of the water heater and high production cost. In addition, the condensate recovery pipeline is greatly affected by the inlet water pressure. When the cold water pressure in the water inlet pipe is high and exceeds the pressure that can be provided by the deadweight of the condensate, the condensate recovery may be blocked.

[0005] Accordingly, the art needs a new gas water heater to solve the above problems. Summary of the invention

[0006] The present invention aims to solve the above technical problems, and at least solve one of the problems of existing condensing gas water heaters, namely, large volume and poor condensed water recovery.

[0007] In a first aspect, the present invention provides a condensate recovery device for a gas water heater, the condensate recovery device comprising: a water collecting portion, which is configured with a water collecting chamber, the water collecting chamber is used to collect condensate generated by a condensing heat exchanger of the gas water heater; a pipe group, which comprises a main line and a bypass line, the bypass line is arranged in parallel with the main line and shares an inlet and an outlet, the inlet and outlet of the pipe group are suitable for being connected in series to a water inlet pipe of the gas water heater, the bypass line comprises a Venturi tube section, the Venturi tube section has an injection inlet, and the injection inlet is connected to the outlet of the water collecting portion; a valve, which is arranged at the inlet of the pipe group, and the valve is arranged to be able to selectively connect the bypass line or the main line.

[0008] The condensate recovery device for the gas water heater provided by the present invention is provided with a pipe group having a parallel main line and a bypass line, and a valve capable of selectively connecting the main line or the bypass line is provided at the inlet of the pipe group, a Venturi pipe section is provided on the bypass pipe, and an injection inlet is provided on the Venturi pipe section, and the injection inlet is connected with a water collecting chamber. In this way, when the condensate collected in the water collecting chamber reaches a certain volume, the bypass line is connected by controlling the valve action. In this way, the cold water entering the water inlet pipe directly enters the bypass line through the inlet of the pipe group, and creates a negative pressure environment during the circulation in the Venturi pipe section. Then, the condensate in the water collecting chamber is sucked into the bypass line through the injection inlet under the action of the negative pressure and mixed with the cold water, and then enters the condensation heat exchanger to exchange heat with the exhaust gas generated by the combustion of the gas, recovering the heat in the exhaust gas, thereby achieving the purpose of recovering waste heat and condensate. In the condensate recovery device, the Venturi tube section is used to provide the driving force in the condensate recovery process. There is no need to configure a special water pump or other power device, and there is no need to consider factors such as the location of the component with the water collecting chamber and the pipeline layout. The structure is simple, the condensate recovery is smooth, and the internal structure of the gas water heater can be made more compact, which is conducive to the miniaturization design of the gas water heater. In addition, since parallel pipelines are set, the Venturi tube section is set on the bypass pipeline, which can minimize the water flow pressure drop during the water inlet process.

[0009] In some feasible implementations of the condensate recovery device for the gas water heater described above, the Venturi tube section is formed on the bypass pipeline.

[0010] In this way, a better way of forming the venturi section is provided.

[0011] It is understandable that the Venturi tube section can also be connected to the bypass pipeline by connection, such as by screwing, screwing combined with bonding, welding, etc. Compared with the method of screwing the Venturi tube section to the bypass pipeline, the one-piece molding method is conducive to improving the sealing performance of the pipeline and avoiding water leakage points at the interface.

[0012] In some feasible embodiments of the condensate recovery device for the gas water heater described above, the water collecting part includes a condensate box, the water collecting chamber is formed in the condensate box, and the outlet of the water collecting part is formed on the condensate box and communicated with the water collecting chamber.

[0013] In this way, a way to realize the water collecting part is provided, that is, a condensed water box dedicated to collecting condensed water is configured, so that the condensed water can be better collected.

[0014] It is understandable that the water collecting chamber can also be integrated on the condensed water treatment device.

[0015] In some feasible embodiments of the condensate recovery device of the above-mentioned gas water heater, a partition is arranged in the water collecting chamber, and the partition divides the water collecting chamber into a first chamber and a second chamber which are arranged side by side and connected by a connecting port, the inlet of the condensate box corresponds to the first chamber, the outlet of the condensate box corresponds to the second chamber, and the height of the inlet of the condensate box is lower than the height of the connecting port.

[0016] A partition is arranged in the water collecting chamber to separate the water collecting chamber into a first chamber and a second chamber which are side by side and connected by a connecting port, and the height of the entrance of the condensate water box is set to be lower than the height of the connecting port. In this way, when the condensate generated in the condensing heat exchanger enters the condensate water box, it first gathers in the first chamber until the water level in the first chamber reaches the height of the connecting port, and the condensate water will enter the second chamber from the first chamber. In this process, due to the increase in water level, the entrance of the condensate water box is completely immersed in the condensate water, thereby achieving the purpose of water sealing, which can prevent some flue gas with higher humidity from entering the condensate water box and being discharged directly from the vent of the condensate water box.

[0017] It is understandable that the vent provided in the condensed water box communicates with the water collecting chamber and the external environment, and is used to maintain the air pressure balance inside and outside the condensed water box. In addition, the inlet of the condensed water box can be connected to the pipe section to achieve the purpose of being lower than the connecting port.

[0018] In some feasible embodiments of the condensate recovery device of the above-mentioned gas water heater, the condensate recovery device also includes a condensate treatment device, the inlet of the condensate treatment device is connected to the outlet of the condensing heat exchanger of the gas water heater, and the outlet of the condensate treatment device is connected to the inlet of the condensate box.

[0019] In addition to water vapor, gas combustion also produces sulfides, CO2, etc. These substances dissolve in condensed water and acidify the water body. Direct recycling is not good for user health. By setting up a condensed water processor, such as neutralizing the acidified condensed water through the processor, the condensed water entering the condensed water box can meet the standard for direct use, which can protect user health and improve user experience.

[0020] In some feasible implementations of the condensate recovery device for the gas water heater described above, the condensate recovery device further includes a connecting pipe, and the outlet of the condensate box is connected to the injection inlet through the connecting pipe.

[0021] In some feasible implementations of the condensate recovery device for the gas water heater described above, the main pipeline is formed on the water inlet pipe.

[0022] In this way, a method for implementing the condensate recovery device is provided, that is, the main line is formed on the water inlet pipe, and the purpose of connecting the bypass line to the main line is achieved by reserving an interface on the water inlet pipe that can be connected to the bypass line.

[0023] In some feasible implementations of the condensate recovery device for the gas water heater described above, the bypass pipeline is integrally formed with the main pipeline.

[0024] In this way, a preferred embodiment of the tube group is provided. Through such an arrangement, a modular arrangement of the condensate recovery device can be achieved, and it is helpful to simplify the installation process.

[0025] In a second aspect, the present invention further provides a control method for a condensate recovery device of a gas water heater, characterized in that the condensate recovery device comprises: a water collecting part, which is configured with a water collecting chamber, and the water collecting chamber is used to collect condensate generated by a condensing heat exchanger of the gas water heater; a pipe group, which comprises a main line and a bypass line, and the bypass line is arranged in parallel with the main line and shares an inlet and an outlet, and the inlet and outlet of the pipe group are suitable for being connected in series to the water inlet pipe of the gas water heater, and the bypass line comprises a Venturi tube section, and the Venturi tube section has an injection inlet, and the injection inlet is connected to the outlet of the water collecting part; a valve is arranged at the inlet of the pipe group, and the valve is arranged to be able to selectively connect the bypass line or the main line, and the control method comprises: obtaining a water level value in the water collecting chamber; when the water level value rises to a first water level threshold, controlling the valve to act to connect the bypass line.

[0026] In some feasible implementations of the control method of the condensate recovery device of the gas water heater mentioned above, the control method further includes: when the water level value drops to a second water level threshold, controlling the valve to operate to connect the main line.

[0027] In a third aspect, the present invention further provides a gas water heater, the gas water heater comprising the condensate recovery device of the gas water heater according to any one of the above technical solutions; or

[0028] The gas water heater comprises a controller, and the controller is configured to be able to execute the control method of the condensate recovery device of the gas water heater described in any of the aforementioned technical solutions.

[0029] Those skilled in the art will appreciate that, since the gas water heater is equipped with the aforementioned condensate recovery device of the gas water heater, or can execute the control method of the aforementioned condensate recovery device of the gas water heater, it has all the technical effects that can be obtained by the aforementioned device or control method, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A schematic diagram of the internal structure of a gas water heater provided in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 The enlarged structural schematic diagram at A in the middle shows the water flow path of the condensed water during the collection stage;

[0033] Figure 3 for Figure 1 The enlarged structural schematic diagram at A in the middle shows the flow path of condensed water during the reflux stage;

[0034] List of reference numerals:

[0035] 1. Gas water heater; 10. Shell; 11. Condensate recovery device; 110. Condensate treatment device; 1100. Connecting pipe; 111. Condensate box; 1110. Partition; 1111. Vent; 1112. Condensate box outlet; 1113. First chamber; 1114. Second chamber; 112. First water level sensor; 113. Second water level sensor; 114. Connecting pipe; 115. Check valve; 116. Venturi tube section; 1160. Injection inlet; 117. Bypass pipeline; 118. Main pipeline; 1180. Pipe group inlet; 1181. Pipe group outlet; 119. Valve; 12. Condensate pipe; 13. Water inlet pipe; 14. Condensation heat exchanger; 15. Fan; 16. Main heat exchanger; 17. Water outlet pipe; 18. Burner; 19. Gas valve; 2. Smoke exhaust pipe. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0037] In order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present invention can also be implemented without certain specific details.

[0038] In the description of the present invention, the terms "upper", "lower", "inner", "outer", "top", "bottom" and the like indicating directions or positional relationships are based on directions or positional relationships in actual applications, which are only for the convenience of description, and do not indicate or imply that the device to be protected must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, ordinal numbers such as "first" and "second" are only for the convenience of description and are not used to indicate or imply relative importance.

[0039] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Refer to the following Figures 1 to 3 The structure and working principle of the gas water heater provided by the embodiment of the present invention are described. Figure 1 A schematic diagram of the internal structure of a gas water heater provided in an embodiment of the present invention; Figure 2 for Figure 1 The enlarged structural schematic diagram at A in the middle shows the water flow path of the condensed water during the collection stage; Figure 3 for Figure 1 An enlarged schematic diagram of the structure at A in the figure shows the flow path of condensed water during the reflux stage.

[0041] like Figure 1 As shown in the figure, the gas water heater 1 provided in the embodiment of the present invention includes a shell 10, and a burner 18, a fan 15, a main heat exchanger 16, a condensing heat exchanger 14, a condensed water recovery device 11, a water inlet pipe 13 and a water outlet pipe 17, etc., which are arranged in the shell 10.

[0042] Specifically, the burner 18 is the core component of the gas water heater 1, which is mainly composed of a nozzle, an igniter, a gas valve 19, a gas pipe and a combustion chamber. The gas enters the combustion chamber through the nozzle and mixes with the air. Under the action of the igniter, the mixed gas burns and generates heat energy.

[0043] The main heat exchanger 16 usually adopts a shell and tube heat exchanger, and of course, a fin heat exchanger can also be used. The main heat exchanger 16 is used to transfer the heat energy generated by the combustion of gas to the water flow to produce hot water. The main heat exchanger 16 is provided with a cold water flow channel for circulating cold water and a flue gas flow channel for circulating high-temperature flue gas. The high-temperature flue gas generated by the combustion of the burner 18 flows through the flue gas flow channel and transfers most of the heat to the cold water in the cold water flow channel, so that the cold water is heated and converted into hot water. The flue gas with a lower temperature after heat exchange with the cold water is converted into exhaust gas. The traditional gas water heater 1 without condensation function will discharge the exhaust gas directly to the external environment. The gas water heater 1 in the embodiment of the present application is provided with a condensing heat exchanger 14, which is used to recover the waste heat in the exhaust gas. The exhaust gas formed by the main heat exchanger 16 enters the condensing heat exchanger 14 under the action of the fan 15, and the waste heat is recovered and utilized in the condensing heat exchanger 14. It should be noted that the burner 18 and the main heat exchanger 16 need to maintain good sealing and coordination to ensure the efficiency and safety of the gas water heater 1 .

[0044] The condensing heat exchanger 14 can use the heat in the exhaust gas to preheat the cold water entering from the water inlet pipe 13, thereby improving the overall energy efficiency of the gas water heater 1 and improving the thermal energy utilization rate. The condensing heat exchanger 14 is connected to the air outlet of the fan 15, and can receive the exhaust gas from the main heat exchanger 16. The condensing heat exchanger 14 is also connected to the exhaust pipe 2 through a pipe, and the exhaust pipe 2 is connected to the outdoor environment. The flue gas condensed by the condensing heat exchanger 14 enters the exhaust pipe 2 through the pipe and is finally discharged to the outdoor environment. Alternatively, it can also be directly connected to the outdoor environment through a pipe without connecting to the exhaust pipe 2. Figure 1 As shown in the figure, referring to the path indicated by the solid arrow, cold water enters the condensing heat exchanger 14 from the water inlet pipe 13 to exchange heat with the exhaust gas to achieve preheating. The preheated cold water enters the main heat exchanger 16 for heat exchange and temperature increase until it reaches the hot water temperature expected by the user and then flows out from the water outlet pipe 17. The water outlet pipe 17 is connected to a water-using end, such as a sink faucet, a bathroom faucet, etc.

[0045] In the gas water heater 1 provided by the present invention, since the condensing heat exchanger 14 will generate a large amount of condensed water in the process of realizing waste heat recovery, in order to recycle the condensed water to avoid waste, the gas water heater 1 provided by the embodiment of the present invention is equipped with a condensed water recovery device 11. The condensed water recovery device 11 can process, recycle and reuse the condensed water generated by the condensing heat exchanger 14, which can not only improve the energy efficiency of the gas water heater 1, but also reduce the waste of water resources.

[0046] The condensate recovery device 11 provided in the embodiment of the present invention includes a water collecting part, a pipe group and a valve 119 .

[0047] Specifically, Figure 2 or Figure 3As shown in , the water collecting part includes a condensed water box 111, a water collecting chamber is formed in the condensed water box 111, and an outlet connected to the water collecting chamber is formed on the condensed water box 111, and the condensed water can flow out of the condensed water box 111 via the outlet. In this embodiment, a partition 1110 is also provided in the water collecting chamber, and the partition 1110 divides the water collecting chamber into a first chamber 1113 and a second chamber 1114 which are arranged side by side. There is a gap between the top of the partition 1110 and the inner top wall of the condensed water box 111, and thus a connecting port connecting the first chamber 1113 and the second chamber 1114 is constructed. It can be understood that the connecting port can also be formed on the partition 1110. The inlet of the condensed water box 111 corresponds to the first chamber 1113, and the outlet 1112 of the condensed water box corresponds to the second chamber 1114. The height of the inlet of the condensed water box 111 is lower than the height of the connecting port, as shown in FIG. Figure 2 As shown in FIG. 1 , the condensate pipe connected to the condensate treatment device 110 penetrates into the interior of the condensate box 111, forming a state in which the height of the entrance of the condensate box 111 is lower than the height of the connecting port. The outlet 1112 of the condensate box is located near the bottom wall of the condensate box 111. The water collection chamber is used to collect the condensate generated by the condensation heat exchanger 14 of the gas water heater 1, and by providing the partition 1110, the purpose of water sealing can be achieved in the process of collecting the condensate.

[0048] The condensed water box 111 is also provided with a vent 1111, which is used to maintain the air pressure balance inside and outside the condensed water box 111, and the vent 1111 is provided at the top of the condensed water box 111. A first water level sensor 112 and a second water level sensor 113 for detecting the water level are also provided in the condensed water box 111, wherein the first water level sensor 112 is provided at a position close to the top wall of the condensed water box 111, corresponding to the first water level threshold, and the second water level sensor 113 is provided at a position close to the bottom wall of the condensed water box 111, corresponding to the second water level threshold, and the first water level sensor 112 and the second water level sensor 113 are connected to the controller, and can transmit the detected water level value to the controller.

[0049] Alternatively, the first water level sensor 112 and the second water level sensor 113 provided in the present embodiment may also be replaced by a movable or fixed single water level meter, as long as the water level value can be detected and obtained.

[0050] A condensate treatment device 110 is provided upstream of the condensate box 111, the inlet of the condensate treatment device 110 is connected to the outlet of the condensation heat exchanger 14 through the condensate pipe 12, and the outlet of the condensate treatment device 110 is connected to the inlet of the condensate box 111 through the connecting pipe 1100. The condensate treatment device 110 is used to neutralize the acidic condensate so that the recovered condensate can meet the standard for direct use.

[0051] Continue to refer to Figure 2or Figure 3 The pipe group of the condensed water recovery device 11 provided in the embodiment of the present invention is connected to the condensed water box 111 through the connecting pipe 114, and the pipe group is connected to the side of the water inlet pipe 13 close to its water inlet end. The pipe group in this embodiment includes a main line 118 and a bypass line 117. The bypass line 117 is arranged in parallel with the main line 118 and shares an inlet and an outlet. Figure 1 As shown in , the inlet 1180 and the outlet 1181 of the pipe group are connected in series to the water inlet pipe 13 of the gas water heater 1, and the outlet 1181 of the pipe group can be connected to the water inlet pipe 13 by screw connection, welding, etc. The bypass pipeline 117 includes a venturi tube section 116, and the venturi tube section 116 has an injection inlet 1160, and the injection inlet 1160 is connected to the outlet 1112 of the condensed water box through a connecting pipe 114. The inner diameter of the inner wall of the venturi tube section 116 is variable, and the inner diameter of the tube section in the middle part is smaller, which is called the throat, and the inner diameter of the tube section at both ends is larger, presenting a tapered tube structure. When cold water with a certain flow rate passes through the throat of the venturi tube section 116, the water flow velocity increases and the static pressure decreases. After the throat, the pipeline expands, the water flow velocity decreases, and the static pressure increases. When the water flows through the throat peak, the static pressure will decrease sharply due to the rapid increase in speed, forming a negative pressure at the throat peak. At this time, a large amount of condensed water in the condensed water box 111 connected to the injection inlet 1160 located downstream of the throat peak will be sucked into the bypass pipeline 117 to achieve the purpose of drainage. In this way, the condensed water will smoothly flow into the water inlet pipe 13 under the joint action of the venturi tube section 116 and the water flow, realizing the recycling of the condensed water.

[0052] Since it takes a certain amount of time to collect condensed water, and setting a venturi tube for ejection will cause the water inlet pressure to drop, in the embodiment of the present invention, by setting a main line 118 and a bypass line 117 connected in parallel, the venturi tube section 116 is set on the bypass line 117, and a valve 119 is set at the inlet 1180 of the pipe group, and the valve 119 is set to be able to selectively connect the bypass line 117 or the main line 118. In this way, the bypass line 117 is only connected when the condensed water needs to be recovered, and the main line 118 is connected during the normal water inlet period, which can maximize the water pressure in the pipeline and avoid causing a pressure drop. In the embodiment of the present invention, the valve 119 can be in the form of an electromagnetically controlled three-way valve, a swing valve, etc., as long as the flow path can be switched smoothly under the set conditions.

[0053] Alternatively, the venturi section 116 may also be formed on the bypass line 117. In addition, the main line 118 may also be formed integrally with the water inlet pipe 13, as long as an interface capable of connecting the bypass line 117 is provided on the main line 118. In addition, the bypass line 117 may also be formed integrally with the main line 118, and the venturi section 116 and the bypass line 117 may be connected as an integral structure, etc.

[0054] Further, in order to better control the water flow, a one-way valve 115 can also be provided on the connecting pipe 114 to prevent the water flow from flowing back. In addition, a switch valve can also be provided at the outlet 1112 of the condensed water box.

[0055] Based on the structure of the condensed water recovery device described above, the present invention further provides a control method for the condensed water recovery device, which is executed during the operation of the gas water heater, and includes:

[0056] S10: Obtain the water level value in the water collection chamber.

[0057] Specifically, the water level value is obtained by the first water level sensor and the second water level sensor and transmitted to the controller. Alternatively, it can also be obtained by a single water level meter.

[0058] S20. When the water level value rises to a first water level threshold, the valve is controlled to connect the bypass line.

[0059] Specifically, Figure 3 As shown in , when it is detected that the water level value reaches the first water level threshold, the valve is controlled to act so that the main pipeline is shut off and the bypass pipeline is connected, and the cold water in the water inlet pipe flows directly through the bypass pipeline ( Figure 3 As shown by the black solid arrow in the middle, the condensed water in the condensed water box can enter the bypass pipeline in sequence through the outlet of the condensed water box, the connecting pipe, and the venturi section under the negative pressure in the venturi section ( Figure 3 The two types of water are mixed in the bypass pipe and then enter the water inlet pipe from the outlet of the pipe group. The mixed water enters the condensing heat exchanger to absorb heat, thereby preheating the cold water. Then, the water is heat-exchanged in the main heat exchanger and reaches the water temperature before flowing out from the water outlet pipe.

[0060] S30. When the water level drops to a second water level threshold, the valve is controlled to connect the main pipeline.

[0061] Specifically, when the water level drops to the second water level threshold, the bypass line is closed, so that the cold water directly enters the condensing heat exchanger through the water inlet pipe, during which the condensed water is collected. Figure 2 As shown in , during this period, cold water directly enters the condensing heat exchanger through the main pipeline for preheating, and the condensed water generated in the condensing heat exchanger first passes through the condensed water processor and then enters the first chamber (such as Figure 1 As shown by the dotted arrow in the figure, the water in the first chamber covers the entrance of the condensation water box and enters the second chamber through the connecting port. The water in the second chamber is in a water storage state until the water in the second chamber reaches the first water level threshold.

[0062] The controller provided by the present invention can execute the control method of the condensate recovery device of the gas water heater in the aforementioned embodiment.

[0063] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A condensate recovery device for a gas water heater, characterized in that: The condensed water recovery device comprises: A water collecting part, which is configured with a water collecting chamber, wherein the water collecting chamber is used to collect condensed water generated by a condensing heat exchanger of the gas water heater; A pipe group, comprising a main pipe and a bypass pipe, wherein the bypass pipe is arranged in parallel with the main pipe and shares an inlet and an outlet, wherein the inlet and the outlet of the pipe group are suitable for being connected in series to a water inlet pipe of the gas water heater, wherein the bypass pipe comprises a venturi pipe section, wherein the venturi pipe section has an ejection inlet, and the ejection inlet is connected to the outlet of the water collecting part; A valve is arranged at the inlet of the pipe group, and the valve is arranged to selectively connect the bypass pipeline or the main pipeline.

2. The condensate recovery device for a gas water heater according to claim 1, characterized in that: The venturi tube section is formed on the bypass line.

3. The condensate recovery device for a gas water heater according to claim 1, characterized in that: The water collecting portion includes a condensed water box, the water collecting cavity is formed in the condensed water box, and the outlet of the water collecting portion is formed on the condensed water box and communicated with the water collecting cavity.

4. The condensate recovery device for a gas water heater according to claim 3, characterized in that: A partition is provided in the water collecting chamber, and the partition divides the water collecting chamber into a first chamber and a second chamber which are arranged side by side and connected through a connecting port. The inlet of the condensation water box corresponds to the first chamber, and the outlet of the condensation water box corresponds to the second chamber. The height of the inlet of the condensation water box is lower than the height of the connecting port.

5. The condensate recovery device for a gas water heater according to claim 3, characterized in that: The condensed water recovery device also includes a condensed water processor, the inlet of the condensed water processor is connected to the outlet of the condensing heat exchanger of the gas water heater, and the outlet of the condensed water processor is connected to the inlet of the condensed water box.

6. The condensate recovery device for a gas water heater according to claim 3, characterized in that: The condensed water recovery device also includes a connecting pipe, and the outlet of the condensed water box is connected to the injection inlet through the connecting pipe.

7. The condensate recovery device for a gas water heater according to any one of claims 1 to 6, characterized in that: The main pipe is formed on the water inlet pipe; or The bypass pipeline is integrally formed with the main pipeline.

8. A control method for a condensate recovery device of a gas water heater, characterized in that: The condensed water recovery device comprises: a water collecting part, which is configured with a water collecting chamber, and the water collecting chamber is used to collect condensed water generated by the condensing heat exchanger of the gas water heater; a pipe group, which comprises a main line and a bypass line, the bypass line is arranged in parallel with the main line and shares an inlet and an outlet, the inlet and outlet of the pipe group are suitable for being connected in series to the water inlet pipe of the gas water heater, the bypass line comprises a venturi pipe section, the venturi pipe section has an injection inlet, and the injection inlet is connected to the outlet of the water collecting part; a valve is arranged at the inlet of the pipe group, and the valve is arranged to selectively connect the bypass line or the main line, The control method comprises: Obtaining a water level value in the water collecting chamber; When the water level value rises to a first water level threshold, the valve is controlled to open the bypass line.

9. The control method of the condensate recovery device of the gas water heater according to claim 8, characterized in that: The control method further comprises: When the water level value drops to a second water level threshold, the valve is controlled to open the main line.

10. A gas water heater, characterized in that: The gas water heater comprises a condensate recovery device of the gas water heater according to any one of claims 1 to 7; or The gas water heater comprises a controller, which is configured to be able to execute the control method of the condensed water recovery device of the gas water heater as claimed in claim 8 or 9.

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