System for heating domestic water by using flue gas recovery heat of gas stove

Abstract

The utility model provides a system for heating domestic water by using flue gas of a gas stove to recover heat. The system comprises a liquid phase working system, a gas phase working system and a heat exchanger, the liquid phase working system comprises a water circulation pipeline, a branch pipe is arranged on the water circulation pipeline, a water tank and a bidirectional booster pump are connected to the branch pipe, one end of the branch pipe is connected to the water circulation pipeline through a first three-way valve, and the other end of the branch pipe is connected to the water circulation pipeline through a second three-way valve; the gas phase working system comprises a flue gas recovery pipeline, the gas inlet end of the flue gas recovery pipeline is connected with a gas stove heat collection device, the gas stove heat collection device is arranged in a gas stove, the gas stove is connected with a first fan, and the gas outlet end of the flue gas recovery pipeline is connected with a second fan; and the water circulating pipeline and the flue gas recovery pipeline pass through the heat exchanger and exchange heat in the heat exchanger. According to the utility model, through reasonable design, flue gas waste heat of the gas stove is recovered and utilized to heat domestic water, and different working modes can be selected for control in different scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke recovery and utilization, in particular to a system for heating domestic water by recovering heat from smoke from a gas stove. Background Art

[0002] At present, most households in urban areas have switched from coal to gas. When cooking with a general gas stove, most of the heat will be lost in the air, and only a small part will be transferred to the kitchen utensils to heat the food. Therefore, under the background of the "dual carbon" goal, it is of great practical significance to use the flue gas of gas stoves to recover heat and apply it reasonably in life. At present, there are some examples of heat recovery methods, but the number of methods for recovering heat is still small, and the practicality and economy are not high, so commercial application has not been realized.

[0003] Therefore, it is necessary to design a system that utilizes gas stove fume to recover heat and heat domestic water to overcome the above problems. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provides a system for heating domestic water by recovering heat from gas stove smoke.

[0005] The utility model provides the following technical solutions:

[0006] The utility model provides a system for heating domestic water by recovering heat from gas stove smoke, the system comprising a liquid phase working system, a gas phase working system and a heat exchanger;

[0007] The liquid phase working system comprises a water circulation pipeline, the water inlet end of the water circulation pipeline is connected to the tap water inlet, the water outlet end of the water circulation pipeline is connected to the hot water outlet, a branch pipe is provided on the water circulation pipeline, a water tank and a two-way booster pump are connected to the branch pipe, one end of the branch pipe is connected to the water circulation pipeline through a first three-way valve, and the other end of the branch pipe is connected to the water circulation pipeline through a second three-way valve;

[0008] The gas phase working system comprises a smoke recovery pipeline, the air inlet end of the smoke recovery pipeline is connected to the gas stove heat collecting device, the gas stove heat collecting device is arranged in the gas stove, the gas stove is connected to the first fan, and the air outlet end of the smoke recovery pipeline is connected to the second fan;

[0009] The water circulation pipeline and the smoke recovery pipeline both pass through a heat exchanger and perform heat exchange in the heat exchanger.

[0010] Furthermore, the gas stove heat collection device includes a heat collection hood and a valve cover, the heat collection hood has a chamber with an opening facing upward and surrounded by a circumferentially closed side wall, the chamber accommodates a burner of the gas stove, the chamber side wall is provided with an exhaust port, the exhaust port is connected to the smoke recovery pipe, the opening of the chamber is fixedly provided with an annular bracket, and the valve cover is arranged on the upper end of the heat collection hood through the annular bracket.

[0011] The valve cover can be opened and closed. When the gas stove is used for cooking, the valve cover is opened, and the flue gas generated is recovered by the heat collecting hood, and the hot flue gas is sent to the flue gas recovery pipe through the exhaust port. When not cooking, the valve cover is closed, and the heat of the flue gas burned by the gas stove is all recovered by the heat collecting hood, and the heat is used to heat the circulating water in the water circulation pipe.

[0012] Furthermore, the first three-way valve is arranged at one end close to the tap water inlet, the second three-way valve is arranged at one end close to the hot water outlet, and the two-way booster pump is arranged between the water tank and the second three-way valve.

[0013] Furthermore, the water tank is coated with a heat-insulating layer.

[0014] Furthermore, the system also includes a control module, the water tank and the heat exchanger are both provided with temperature sensors, and the control module is electrically connected to the first fan, the second fan, the gas stove heat collection device, the heat exchanger, the water tank, the first three-way valve, the second three-way valve, and the two-way booster pump respectively.

[0015] Furthermore, the control module is a single chip microcomputer.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model recovers the waste heat of gas stove smoke and utilizes it to heat domestic water through reasonable design. The system designs a water circulation process and optimizes the process control of water circulation. The water circulates during heating to avoid uneven heating caused by stagnant water, which not only fails to achieve the expected heating effect but also poses a safety hazard. In the event that the temperature of some water is too high, different working modes can be selected for control in different scenarios.

[0018] 2. The system is also equipped with a two-way booster pump to ensure smooth and safe operation of the water circulation, and to prevent insufficient water pressure from affecting water circulation and water output.

[0019] 3. This system can reasonably and safely store the heat recovered from the smoke during cooking in the water tank by controlling the temperature, and set an insulation layer on the water tank to reduce heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a system provided by an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the heat collecting device for a gas stove in an embodiment of the utility model (the burner is not shown);

[0023] Figure 3 Flow chart of system working mode 1 in the embodiment of the utility model;

[0024] Figure 4 Flow chart of system working mode 2 in the embodiment of the utility model;

[0025] Figure 5 Flow chart of system working mode 3 in the embodiment of the utility model;

[0026] In the figure: 1-liquid phase working system; 2-gas phase working system; 3-heat exchanger; 4-water circulation pipeline; 5-smoke recovery pipeline; 6-branch pipe; 7-water tank; 8-two-way booster pump; 9-first three-way valve; 10-second three-way valve; 11-gas stove heat collecting device; 12-first fan; 13-second fan; 14-insulation layer; 101-gas stove; 102-chamber; 103-exhaust port; 104-ring bracket; 105-valve cover; 106-burner bracket. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1 , the embodiment of the utility model provides a system for heating domestic water by utilizing the heat recovered from the smoke of a gas stove, the system comprising a liquid phase working system, a gas phase working system and a heat exchanger;

[0029] The liquid phase working system includes a water circulation pipeline, the water inlet end of the water circulation pipeline is connected to the tap water inlet, the water outlet end of the water circulation pipeline is connected to the hot water outlet, a branch pipe is opened on the water circulation pipeline, a water tank and a two-way booster pump are connected to the branch pipe, one end of the branch pipe is connected to the water circulation pipeline through a first three-way valve, and the three branches of the first three-way valve are represented as a, b, and c respectively, and the other end of the branch pipe is connected to the water circulation pipeline through a second three-way valve, and the three branches of the second three-way valve are represented as d, e, and f respectively;

[0030] The gas phase working system includes a smoke recovery pipeline, the air inlet end of the smoke recovery pipeline is connected to the gas stove heat collecting device, the gas stove heat collecting device is arranged in the gas stove to collect the heat of the smoke, the gas stove is connected to the first fan, and the air outlet end of the smoke recovery pipeline is connected to the second fan for exhaust;

[0031] The water circulation pipeline and the flue gas recovery pipeline both pass through the heat exchanger and perform heat exchange in the heat exchanger.

[0032] The utility model recovers the waste heat of gas stove smoke and uses it to heat domestic water through reasonable design, designs a water circulation process and optimizes the process control of water circulation. When heating, the water circulates to avoid uneven heating caused by static water, which not only fails to achieve the expected heating effect but also has safety hazards, resulting in the situation where the temperature of some water is too high. When the water temperature is lower than the required temperature, the water is controlled by the valve to keep circulating and heating in the pipeline until the required temperature is reached. The system is also equipped with a two-way booster pump to ensure the smooth and safe operation of the water circulation, and to avoid insufficient water pressure affecting the water circulation and water discharge.

[0033] See also Figure 2 As a preferred embodiment, the heat collecting device of the gas stove in the utility model includes a heat collecting cover and a valve cover. The heat collecting cover has a chamber with an opening facing upward and surrounded by a circumferentially closed side wall. The chamber contains a burner of the gas stove. The burner is arranged on a burner bracket. An exhaust port is opened on the side wall of the chamber. There are multiple exhaust ports and they are distributed annularly on the circumferential side wall of the chamber. The exhaust port is connected to a main pipe and connected to a smoke recovery pipe. An annular bracket is fixedly provided at the opening of the chamber. The valve cover is arranged on the upper end of the heat collecting cover through the annular bracket. In one embodiment, the valve cover includes two left and right cover doors, which can slide on the annular bracket. When the valve cover is opened, the cover door is stored in the gas stove. When the valve cover is closed, the left and right cover doors are closed to close the heat collecting cover.

[0034] As a preferred embodiment, the first three-way valve is arranged at one end close to the tap water inlet, the second three-way valve is arranged at one end close to the hot water outlet, and the two-way booster pump is arranged between the water tank and the second three-way valve to ensure smooth water inlet and outlet.

[0035] As a preferred embodiment, in order to facilitate intelligent control of the system, the system also includes a control module. The water tank and the heat exchanger are both provided with temperature sensors. The control module is electrically connected to the first fan, the second fan, the gas stove heat collecting device, the heat exchanger, the water tank, the first three-way valve, the second three-way valve, and the two-way booster pump, respectively.

[0036] In this embodiment, the control module may be specifically a single chip microcomputer, and the model of the single chip microcomputer is STM32F103C8T6.

[0037] In addition, considering the heat loss of the water tank and avoiding heat loss and waste, in a preferred embodiment, the water tank is coated with a thermal insulation layer, and the material of the thermal insulation layer is foamed polyurethane.

[0038] This system is divided into three working modes according to actual life scenarios: cooking only, fetching water only, and cooking and fetching water at the same time.

[0039] Working mode 1: Cooking only

[0040] See also Figure 2 The specific workflow in this mode is as follows:

[0041] S1: The user turns the knob of the gas stove, and the first fan starts and ignites;

[0042] S2: The second fan starts and the valve cover opens;

[0043] S3: Determine the water temperature T in the water tank 0 Is it higher than 70℃?

[0044] S31: If not, determine the residual temperature T of the heat exchanger e Is it higher than the water temperature T in the water tank? 0 , until heated to Te>T 0 , then the second three-way valves e and f are connected, the first three-way valves b and c are connected, the two-way booster pump is turned on, and the process returns to S3;

[0045] S32: If yes, the liquid phase as a whole does not work, and it is determined whether cooking is finished and whether the gas stove has finished working;

[0046] S321: If not, return to S3;

[0047] S322: If yes, close the first fan, the second fan and the valve cover, and the process ends.

[0048] Working mode 2: only take water

[0049] See also Figure 3 The specific workflow in this mode is as follows:

[0050] S1: User sets water temperature T n And water consumption V n ;

[0051] S2: Determine T n Is it greater than the water temperature T in the water tank? 0 ;

[0052] S21: If yes, the second three-way valves e and f are connected, the first three-way valves b and c are connected, the first fan, the second fan, and the two-way booster pump are started, the gas stove is ignited, and the valve cover is closed until T n Greater than the water temperature T in the water tank 0 , the first fan, the second fan and the gas stove stop working;

[0053] S22: If not, the second three-way valves d and e are connected, and the bidirectional booster pump is started;

[0054] S221: Water starts to flow out until the water flow rate V reaches V h , the second three-way valve is closed;

[0055] Water output V h Calculated by the following equation:

[0056]

[0057] V n =V c +V h (2)

[0058]

[0059] 222: Determine the residual temperature T of the heat exchanger e Is it greater than the tap water temperature T c ;

[0060] S2221: If yes, the second three-way valves e and f are connected, and the first three-way valves a and c are connected;

[0061] S2222: If not, the first three-way valves a and b are connected;

[0062] S223: Until the water tank is full and T 0 >T e , the process ends.

[0063] Working mode 3: Cooking and fetching water at the same time

[0064] See also Figure 4 The specific workflow in this mode is as follows:

[0065] S1: User sets water temperature T n And water consumption V n ;

[0066] S2: Determine T nIs it greater than the water temperature T in the water tank? 0 ;

[0067] S21: If yes, the second three-way valves e and f are connected, the first three-way valves b and c are connected, the first fan, the second fan, and the two-way booster pump are started, the gas stove is ignited, and the valve cover is closed. When the user starts cooking, the valve cover is opened, and T is determined. n Is it greater than the water temperature T in the water tank? 0 ;

[0068] S211: If yes, return to S21;

[0069] S212: If not, proceed to S22;

[0070] S22: If not, the second three-way valves d and e are connected, and the bidirectional booster pump is started;

[0071] S221: Water starts to flow out until the water flow rate V reaches V h , the second three-way valve is closed;

[0072] Water output V h Calculated by the following equation:

[0073]

[0074] V n =V c +V h (2)

[0075]

[0076] S222: Determine the residual temperature T of the heat exchanger e Is it greater than the tap water temperature T c ;

[0077] S2221: If yes, the second three-way valves e and f are connected, and the first three-way valves a and c are connected;

[0078] S2222: If not, the first three-way valves a and b are connected;

[0079] S223: Until the water tank is full and T 0 >T e , the process ends.

[0080] This system can basically meet all actual life scenarios and can select different working modes for control in different scenarios; this system can reasonably regulate the temperature and safely store the heat recovered from the smoke during cooking in the water tank, which can be reasonably used when water is needed.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for heating domestic water by recovering heat from gas stove smoke, characterized in that: The system comprises a liquid phase working system, a gas phase working system and a heat exchanger; The liquid phase working system comprises a water circulation pipeline, the water inlet end of the water circulation pipeline is connected to the tap water inlet, the water outlet end of the water circulation pipeline is connected to the hot water outlet, a branch pipe is provided on the water circulation pipeline, a water tank and a two-way booster pump are connected to the branch pipe, one end of the branch pipe is connected to the water circulation pipeline through a first three-way valve, and the other end of the branch pipe is connected to the water circulation pipeline through a second three-way valve; The gas phase working system comprises a smoke recovery pipeline, the air inlet end of the smoke recovery pipeline is connected to the gas stove heat collecting device, the gas stove heat collecting device is arranged in the gas stove, the gas stove is connected to the first fan, and the air outlet end of the smoke recovery pipeline is connected to the second fan; The water circulation pipeline and the smoke recovery pipeline both pass through a heat exchanger and perform heat exchange in the heat exchanger.

2. The system for heating domestic water by recovering heat from gas stove smoke as claimed in claim 1, characterized in that: The gas stove heat collecting device includes a heat collecting hood and a valve cover. The heat collecting hood has a chamber with an upward opening and surrounded by a circumferentially closed side wall. The chamber accommodates a burner of the gas stove. The side wall of the chamber is provided with an exhaust port, which is connected to a smoke recovery pipe. An annular bracket is fixedly provided at the opening of the chamber, and the valve cover is arranged on the upper end of the heat collecting hood through the annular bracket.

3. The system for heating domestic water by recovering heat from gas stove smoke as claimed in claim 1, characterized in that: The first three-way valve is arranged at one end close to the tap water inlet, the second three-way valve is arranged at one end close to the hot water outlet, and the two-way booster pump is arranged between the water tank and the second three-way valve.

4. The system for heating domestic water by recovering heat from gas stove smoke as claimed in claim 1, characterized in that: The water tank is coated with a heat-insulating layer.

5. The system for heating domestic water by recovering heat from gas stove smoke as claimed in claim 2, characterized in that: The system also includes a control module. The water tank and the heat exchanger are both provided with temperature sensors. The control module is electrically connected to the first fan, the second fan, the gas stove heat collecting device, the heat exchanger, the water tank, the first three-way valve, the second three-way valve, the two-way booster pump, and the valve cover.

6. The system for heating domestic water by recovering heat from gas stove smoke as claimed in claim 5, characterized in that: The control module is a single chip microcomputer.

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