CN109237799B - Control method of gas water heater - Google Patents

Abstract

The invention discloses a gas water heater control method, which is characterized by comprising the following steps: 1) setting the starting water flow; 2) setting the working water flow; 3) when the gas water heater is ignited and started; if the starting water flow < the working water When the water flow rate reaches the set temperature, it switches to the working water flow rate; if the starting water flow rate ≥ the working water flow rate, the working water flow rate is directly corresponding to the starting water flow, there is a matching first gas flow, and the first gas flow is used to heat the starting water flow to a set temperature; corresponding to the working water flow, there is a matching first gas flow. The second gas flow is used to heat the working water flow to a set temperature. The invention makes the gas water heater consume less water and gas when starting, and can quickly make the outlet water temperature reach the set temperature.

Description

A gas water heater control method

technical field

The invention relates to the technical field of fluid heater control, in particular to a gas water heater control method.

Background technique

Gas water heaters are generally installed in the kitchen or living balcony, far from the bathroom. After the gas water heater turns on the water valve switch, the water heated by the gas water heater needs to go through a long water path to reach the water point. Previously, the low-temperature water below the user's demand temperature was not available, which inevitably caused water resources and gas. waste of resources. When users use hot water, there are many frequent opening/closing of the water valve, and each time the water valve is opened, a large amount of cold water, warm water and gas are wasted.

Although gas water heaters with circulating pumps on the market can achieve the effect of zero cold water and avoid the waste of cold water, they have the disadvantages of large gas consumption and high product cost due to their preheating function, making it difficult to popularize applications.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a gas water heater control method that consumes less water and gas and can quickly make the outlet water temperature reach the set temperature.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A gas water heater control method, comprising the following steps:

1) Set the startup water flow;

2) Set the working water flow;

3) When the gas water heater is ignited and started; if the starting water flow is less than the working water flow, first work with the starting water flow, and when the outlet water temperature reaches the set temperature, switch to the working water flow to work; if The starting water flow rate ≥ the working water flow rate, and the working water flow rate is directly used; corresponding to the starting water flow rate, there is a matching first gas flow rate, and the first gas flow rate is used to convert the starting water flow rate. The water flow is heated to the set temperature; the working water flow has a matching second gas flow, and the second gas flow is used to heat the working water flow to the set temperature.

As a further description of the above solution, the starting water flow is a certain value, which is stored in the main controller of the gas water heater.

As a further description of the above solution, the setting of the working water flow is realized through an operation display connected to the main controller of the gas water heater.

As a further description of the above solution, the temperature of the outlet water is measured in real time by a temperature sensor disposed at the water outlet of the gas water heater.

As a further description of the above solution, the switching between the starting water flow and the working water flow is realized by adjusting the opening of the water proportional valve installed on the gas water heater inlet or outlet pipeline.

As a further description of the above solution, the switching between the first gas flow rate and the second gas flow rate is realized by adjusting the opening degree of the gas proportional valve.

As a further description of the above solution, the first gas flow rate is calculated from the inlet water temperature, the set temperature and the start-up water flow rate.

As a further description of the above solution, the second gas flow rate is calculated from the inlet water temperature, the set temperature and the working water flow rate.

As a further description of the above solution, the inlet water temperature is measured in real time by an inlet water temperature sensor arranged on the inlet pipe of the gas water heater.

As a further description of the above solution, the start-up water flow is 30-60% of the hot water yield of the gas-fired water heater.

The beneficial effects of the present invention are:

When the gas water heater is ignited and started, adding a starting water flow working link smaller than the working water flow, without increasing the cost of the gas water heater, the user can automatically save energy in the process of using water, save water, save gas, and be more environmentally friendly, and Shorten the duration of warm water, thereby shortening the waiting time for users to use water, and improving the comfortable experience of users with water.

Description of drawings

FIG. 1 is a schematic structural diagram of the gas water heater provided by the present invention.

FIG. 2 is a flow chart of a conventional gas water heater control method.

FIG. 3 is a flow chart showing the control method of the gas water heater provided by the present invention.

Description of reference numbers:

1: Main controller, 2: Operation display, 3: Outlet water temperature sensor, 4: Inlet water temperature sensor, 5: Water proportional valve, 6: Adjust gas proportional valve.

Detailed ways

In the description of the present invention, it should be noted that for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise" ” and the like indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or indicating the number of technical features. Thus, the definition of "first" and "second" features may expressly or implicitly include one or more of the features, and in the description of the present invention, "at least" means one or more than one, unless otherwise expressly specified. limit.

In the present invention, unless otherwise expressly specified and limited, the terms "assembled", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated It can be connected to the ground; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two components can be connected internally. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the invention, unless otherwise specified and limited, a first feature "on" or "under" a second feature may include the first and second features being in direct contact, or may include that the first feature and the second feature are not directly in contact contact but through additional features between them. Also, the first feature being "above", "below" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply denoting that the first feature is at a higher level than the second feature the height of. The first feature being "above", "below" and "below" the second feature includes that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is level below the second feature.

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings in the specification, so as to make the technical solutions of the present invention and the beneficial effects thereof more clear and definite. The embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

A gas water heater control method, comprising the following steps:

1) Set the startup water flow.

2) Set the working water flow.

3) When the gas water heater is ignited and started; if the starting water flow is less than the working water flow, first work with the starting water flow, and when the outlet water temperature reaches the set temperature, switch to the working water flow to work; if The starting water flow rate ≥ the working water flow rate, and the working water flow rate is directly used; corresponding to the starting water flow rate, there is a matching first gas flow rate, and the first gas flow rate is used to convert the starting water flow rate. The water flow is heated to the set temperature; the working water flow has a matching second gas flow, and the second gas flow is used to heat the working water flow to the set temperature.

1, the starting water flow is a certain value, which is stored in the main controller 1 of the gas water heater, which can simplify program calculation, shorten the operation time of the main controller, and speed up the output of hot water. The first gas flow rate is calculated by the main controller 1 according to the inlet water temperature, the set temperature and the start-up water flow rate. The second gas flow rate is calculated by the main controller 1 according to the inlet water temperature, the set temperature and the working water flow rate. The setting of the working water flow is realized through the operation display connected with the main controller of the gas water heater. The outlet water temperature is measured in real time by the outlet water temperature sensor 3 arranged at the water outlet of the hot gas water heater. The inlet water temperature is measured in real time by the inlet water temperature sensor 4 arranged on the inlet pipe of the gas water heater. The switching between the starting water flow rate and the working water flow rate is realized by adjusting the opening degree of the water proportional valve 5 installed on the water inlet pipe (or the water outlet pipe) of the gas water heater. The switching between the first gas flow rate and the second gas flow rate is realized by adjusting the opening degree of the gas proportional valve 6 .

The start-up water flow is 30-60% of the hot water yield of the gas water heater, so as to avoid excessive temperature fluctuations when switching between the start-up water flow and the set water flow, which affects the comfort of water use.

For example, in one embodiment, when the hot water production rate of the gas water heater is less than or equal to 16 kg/min, the starting water flow rate is 6 kg/min. In another embodiment, when the hot water production rate of the gas water heater is greater than 16 kg/min, the starting water flow rate is 9 kg/min. Verified by a large number of actual use data, when the starting water flow is switched to the working water flow under the above-mentioned limited conditions, although the water temperature fluctuates, the fluctuation range can be controlled within ±3°C. Since the user is just beginning to adapt to the hot water temperature at this time, this fluctuation does not affect the user's experience at all.

As shown in Figure 2, in the traditional technology, after the user turns on the shower, the gas water heater starts, and the main controller calculates according to the current inlet water temperature T ₁ ℃, the user-set temperature T ₂ ℃, the current water flow V _water , and directly according to The required gas volume V _gas output needs to supply the current of the gas proportional valve, the water heater takes t before outputting hot water at T ₂ ℃, the water consumption is Q _water , and the gas consumption is Q _gas .

As shown in FIG. 3 , this embodiment provides a method for controlling a gas water heater. The main controller and the water proportional valve are used to divide the Q _water and Q _gas consumed in each start-up phase of the water heater into two phases. After the gas water heater starts and ignites, the main controller calculates and adjusts the water proportional valve stepper motor to reduce the water flow. At this time, the water flow is V _{water 1} , and the gas flow rate V _{gas 1} is input according to the ratio of V _{water 1.} The gas water heater Output hot water at T ₂ ℃, because the water flow becomes smaller, the duration of warm water is effectively shortened (warm water: hot water below the user's required temperature), so that the temperature of the gas water heater outlet quickly reaches the set temperature, Meet the user's hot water demand in advance and shorten the user's waiting time for water. This process takes t1, the water consumption is Q _{water 1} , and the gas consumption is Q _{gas 1} . Then adjust the water proportional valve stepper motor again, the water flow is V _{water 2} , and the input air flow V _{air 2} is proportional to V _water 2, and the water heater outputs T ₂ ℃ hot water. This process takes t2.

Since V _{water 1} < V _water , t1 < t, so Q water 1 < Q water, to save water; and because V _{gas 1} < V _gas , t1 < t, so Q _{gas 1} <Q _gas , to save gas effect.

Through the description of the above-mentioned structure and principle, those skilled in the art should understand that the present invention is not limited to the above-mentioned specific embodiments, and the improvement and substitution of the technology known in the art on the basis of the present invention all fall within the protection of the present invention Scope, the protection scope of the present invention shall be defined by the respective claims and their equivalents. The parts not described in the detailed description are the prior art or common knowledge.

Claims (10)

1. A gas water heater control method, characterized in that, comprising the following steps: 1) Set the startup water flow; 2) Set the working water flow; 3) When the gas water heater is ignited and started; if the starting water flow is less than the working water flow, first work with the starting water flow, and when the outlet water temperature reaches the set temperature, switch to the working water flow to work; if The starting water flow rate ≥ the working water flow rate, and the working water flow rate is directly used; corresponding to the starting water flow rate, there is a matching first gas flow rate, and the first gas flow rate is used to convert the starting water flow rate. The water flow is heated to the set temperature; the working water flow has a matching second gas flow, and the second gas flow is used to heat the working water flow to the set temperature. 2 . The method for controlling a gas water heater according to claim 1 , wherein the starting water flow rate is a certain value, which is stored in the main controller of the gas water heater. 3 . 3 . The method for controlling a gas water heater according to claim 1 , wherein the setting of the working water flow is realized through an operation display connected to the main controller of the gas water heater. 4 . 4 . The method for controlling a gas water heater according to claim 1 , wherein the outlet water temperature is measured in real time by a temperature sensor disposed at the water outlet of the gas water heater. 5 . 5 . A gas water heater control method according to claim 1 , wherein the switching between the starting water flow rate and the working water flow rate is adjusted by adjusting a water heater installed on the gas water heater inlet or outlet pipe. 6 . Water proportional valve opening to achieve. 6 . The method for controlling a gas water heater according to claim 1 , wherein the switching between the first gas flow rate and the second gas flow rate is realized by adjusting the opening degree of a gas proportional valve. 7 . 7 . The method for controlling a gas water heater according to claim 1 , wherein the first gas flow rate is calculated from the inlet water temperature, the set temperature and the starting water flow rate. 8 . 8 . The method for controlling a gas water heater according to claim 1 , wherein the second gas flow rate is calculated from the inlet water temperature, the set temperature and the working water flow rate. 9 . 9. A gas water heater control method according to claim 7 or 8, wherein the inlet water temperature is measured in real time by an inlet water temperature sensor disposed on the gas water heater inlet pipe. 10 . The method for controlling a gas water heater according to claim 1 , wherein the start-up water flow is 30-60% of the hot water production rate of the gas water heater. 11 .

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