CN111795505B - Gas water heater preheating control method - Google Patents

Abstract

The invention discloses a preheating control method of a gas water heater, which comprises the following steps: acquiring the water consumption appointment time; acquiring the time t required by preheating; and executing a circulating preheating control step from the water use reserving time advance time t. The gas heater of this embodiment preheats control method, the user can reserve the water consumption time, the water heater is long according to preheating needs, start in advance and preheat for it is used for reserving the water consumption time just to make the reservation when accomplishing, because preheating water mainly stops in the pipeline, does not have the heat preservation measure heat to run off easily, can not lead to the temperature to run off because of preheating in advance, extravagant electric energy can not be later than the user reservation water consumption time again, lead to the user to wait, provide convenient to use for the user when energy-conserving.

Description

Gas water heater preheating control method

technical field

The invention belongs to the technical field of hot water production equipment, and in particular relates to a preheating control method for a gas water heater.

Background technique

The gas water heater is an instant water heater, but the water remaining in the pipeline from the heating end to the water end is cold water, which makes it impossible to turn on the hot water. Therefore, the current zero-cold water gas water heater uses a built-in circulating water pump in the gas water heater. When the "zero cold water" function of the gas water heater is turned on, the circulating water pump starts to work, and the cold water in the installed water pipe is pumped to the burner for heating until the setting is reached. temperature, so that the hot water flows out as soon as the water end is opened.

Since the gas water heater only needs to preheat the water in the circulation pipeline, the general gas water heater does not have the function of pre-serving water at present, and the user turns on the zero cold water circulation preheating when using it. When the temperature of the household water with a lower temperature is heated to the temperature set by the user to complete the cycle, when the temperature difference between the initial temperature and the set temperature is large, there is also the problem of a long heating time. At present, in order to complete the cycle preheating as soon as possible, the gas water heater adopts high-load combustion during the cycle heating, the speed of the water pump and the fan is high, and the combustion noise is large. The user has to endure the noise in the process while waiting for the water heater to finish preheating for a long time.

At present, the gas water heater can only perform cyclic preheating according to the set value, and the output water temperature is fixed. However, users sometimes do not need to preheat the water in the circulating pipeline to a higher temperature, resulting in unnecessary waste.

SUMMARY OF THE INVENTION

Aiming at the problem that the existing gas water heaters do not have a reservation function, the user needs to wait for a long time for circulating preheating when using water, and proposes a gas water heater preheating control method, which can solve the above problems.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical scheme to realize:

A preheating control method for a gas water heater, comprising:

Get the appointment time for water use;

Obtain the time t required for preheating;

The cycle preheating control step is executed from the advance time t of the reserved water time.

Further, it also includes obtaining the water temperature T;

The cyclic preheating control steps include:

The first-stage circulating preheating step controls to heat the incoming water to the first temperature T1;

According to the water temperature T, it is judged whether to perform the secondary circulation preheating step;

The secondary circulation preheating step controls to heat the feed water to a second temperature T2, where T1<T2.

Further, the method for judging whether to perform the secondary cycle preheating step is:

When T<T2, the secondary cycle preheating step is not performed;

When T≥T2, the secondary cycle preheating step is performed.

Further, the first-stage circulation preheating step includes:

Detect the inlet water temperature. When the inlet water temperature is less than T1, turn on the circulating pump to detect the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited.

Further, in the first-stage circulation preheating step, the rotation speed of the circulation pump is lower than its maximum rotation speed, and the combustion load of the gas water heater is lower than its maximum combustion load.

Further, the secondary circulation preheating step includes:

Detect the inlet water temperature. When the inlet water temperature is less than T2, turn on the circulating pump and check the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited.

Further, in the secondary circulation preheating step, the rotation speed of the circulation pump is equal to its maximum rotation speed, and the combustion load of the gas water heater is lower than its maximum combustion load.

Further, when T<T2, the time required for preheating is t=t1;

When T≥T2, the time required for preheating is t=t1+t2;

The primary cycle preheating step also includes recording the time required to heat the feed water to the first temperature T1, and updating and saving it to t1, and the secondary cycle preheating step also includes recording the time required to heat the feed water to the second temperature T1. duration, and the update is saved to t2.

Further, in the cycle preheating control step, when the ignition time of the gas water heater is greater than the set threshold, the combustion is stopped, and the circulating pump continues to work for a time t3 and then stops.

Further, after the circulating pump stops working for the time t4, it returns to the circulating preheating control step.

Compared with the prior art, the advantages and positive effects of the present invention are: in the preheating control method for a gas water heater in this embodiment, the user can reserve the time for water use, and the water heater starts preheating in advance according to the time required for preheating, so that when the reservation is completed, the It happens to be used to reserve water time. Since the preheated water mainly stays in the pipeline, heat is easily lost without thermal insulation measures, that is, it will not cause temperature loss and waste electricity due to preheating in advance, and it will not be later than the user's water reservation time. It causes the user to wait, saves energy and provides convenience for the user.

Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a flow chart of an embodiment of the preheating control method for a gas water heater proposed by the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

The gas-fired water heater includes a combustion chamber, which uses the heat generated by the combustion of the gas to heat the cold water flowing through it, so it is instant hot water for the outlet end of the burner. Due to the long pipe connection between the water end of the burner and the water outlet of the burner, the cold water stored in the pipes of the water outlet of the burner and the water end cannot be used immediately. heat, achieve zero cold water discharge, and users cannot use hot water during the cycle warm-up. If the temperature difference between the inlet and outlet of the burner is large, or the distance between the water end and the outlet end of the burner is too long, the user still needs to wait for a long time, and in order to complete the cycle preheating process quickly, the burner uses high-load combustion, resulting in Burning noise is loud.

Because the amount of water that gas water heaters need to preheat is much less than that of storage water heaters, few gas water heaters currently have the function of reserved water. Moreover, the gas water heater has no physical insulation function. If the preheated water is not used in time, it will quickly cool down, resulting in energy waste. It can be known from the known public information that the gas water heater with the function of water reservation is limited to the user setting the reservation time period and the preset temperature, that is, the user sets one or more time periods, during which the user may use For hot water, the gas water heater will be preheated. If it exceeds this time period, it will not be preheated, and whether the user has completed the preheating cycle when using hot water within this time period cannot be determined, and the user still cannot avoid waiting for water.

Example 1

This embodiment proposes a preheating control method for a gas water heater, as shown in FIG. 1 , including:

Obtain the reserved water usage time; in this embodiment, the user can set a specific water usage time point, and the water heater will complete preheating before this time.

Obtain the time t required for preheating;

The cycle preheating control step is executed from the advance time t of the reserved water time. When the reserved water time is reached, the cycle preheating is completed, and the user does not need to wait, and the hot water can be produced immediately after use.

When setting the reserved water, the user needs to set the water temperature. If the user does not set it, the system has a default value. The gas water heater preheating control method in this embodiment further includes acquiring the water temperature T;

The cycle preheating control steps include:

The first-stage circulating preheating step controls to heat the incoming water to the first temperature T1;

According to the water temperature T, it is judged whether to perform the secondary cycle preheating step;

The secondary circulation preheating step controls to heat the feed water to the second temperature T2, where T1<T2.

In this scheme, by setting up two-stage circulation, the first-stage circulation preheating is low-temperature circulation preheating. First, the cold water in the pipeline is heated into warm water to meet the user's demand for warm water, and the warm water can be enjoyed by opening the water end. And according to the water temperature T to determine whether to carry out secondary circulation preheating. In the preheating step of the primary cycle, the difference between the set first temperature T1 and the temperature of the inlet water is not particularly large, so the primary cycle can be heated by low load to preheat the water in the pipeline to a certain temperature, which will be used later. The secondary cycle quickly completes the preheating preparation.

In this embodiment, the method for judging whether to perform the secondary cycle preheating step is as follows:

When T<T2, the secondary circulation preheating step is not performed; that is, the water temperature T does not reach the second temperature T2, and the user's water demand is warm water, so there is no need to perform secondary circulation preheating. The water temperature T can be greater than the first temperature T1 or less than the first temperature T1, and the temperature difference between the two will not be too large. Therefore, the temperature heated by the first-stage circulation preheating can be used, which saves energy consumption and does not require users to Wait without degrading the user experience. When the user continues to use water, the gas water heater will ignite to heat the supplemented cold water, so the user can continue to use the water up to the set water temperature.

The method for judging whether to perform the second-level circulation preheating step may further include that the user operates the water heater itself or an APP to enter.

When T ≥ T2, that is, the user needs high-temperature water to meet the needs of bathing, for example, a secondary cycle preheating step needs to be performed.

In this scheme, two-stage preheating is performed, and the first-stage cycle is heated to warm water or the second-stage cycle is heated to hot water according to the actual needs of the user, which does not cause energy waste, and because the first-stage cycle has nearly heated the water to To a certain extent, the final preheating can be completed quickly when the secondary cycle heating is performed.

As a preferred embodiment, the first-stage circulation preheating step in this embodiment includes:

Detect the inlet water temperature. When the inlet water temperature is less than T1, turn on the circulating pump to detect the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited. The gas water heater determines whether the circulating water pump reaches the starting conditions according to the inlet water temperature, set temperature, water flow, etc. If the conditions are not met, the circulating pump will stop after running for a period of time; after reaching the starting combustion conditions, it will enter the zero-cold water primary circulation preheating.

Since the target temperature of the first-stage circulation preheating step is T1 low-temperature water, there is no need to turn on high-load heating in the first-stage circulation preheating step, so that the combustion load of the gas water heater is lower than its maximum combustion load, so the rotation speed of the circulation pump is correspondingly lower than At its maximum speed, when the water flows through the combustion chamber at a low speed, it is fully heated, and the circulating water can be evenly heated to T1.

The rotational speed of the circulating pump can be adjusted to 50% to 90% of its maximum rotational speed, preferably 80% of its maximum rotational speed.

The application scenarios of warm water demand with a temperature of T1 are common in home life. For example, when the temperature is low, the needs of washing and washing, and when the temperature is high, the demand for bathing is not particularly high on the water temperature. This embodiment is used. A first-level cycle can be achieved. Save energy while shortening warm-up time.

During the preheating of the primary cycle, the difference between the real-time monitoring of the inlet water temperature and the temperature T1 is used to determine whether the condition for stopping combustion is reached. The difference can be adjusted. After reaching the condition for stopping the secondary circulation, the pump continues to run for a period of time and then stops.

Preferably in this embodiment, the secondary circulation preheating step includes:

Detect the inlet water temperature. When the inlet water temperature is less than T2, turn on the circulating pump and check the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited.

In the secondary circulation preheating step, the rotation speed of the circulation pump is equal to its maximum rotation speed, and the combustion load of the gas water heater is lower than its maximum combustion load.

Since the secondary circulation preheating is performed after the primary circulation preheating, the primary circulation has already heated the water to a certain extent. Therefore, the circulation pump can be turned on to run at the maximum speed, and the warm water can quickly heat up when it flows through the combustion chamber. , the combustion load of the gas water heater is still lower than its maximum combustion load, and the final preheating can be completed quickly.

In this embodiment, whether it is the first-stage cycle preheating or the second-stage cycle preheating, the combustion load of the gas water heater does not need to be turned on to the maximum combustion load, so the combustion noise is small.

The time t required for preheating can be an empirical set value, or it can be updated according to the timing of each cycle preheating.

When T<T2, the time required for preheating is t=t1;

When T≥T2, the time required for preheating is t=t1+t2;

The primary cycle preheating step also includes recording the time required to heat the feed water to the first temperature T1, and updating and saving it to t1, and the secondary cycle preheating step also includes recording the time required to heat the feed water to the second temperature T1. duration, and the update is saved to t2.

Since the time required for preheating is directly related to the inlet water temperature, and the inlet water temperature is related to the air temperature, by timing and updating the time used for each cycle, the time interval between two adjacent preheating cycles will not be too long, so The inlet water temperature is close, so the time required for the appointment is also close, which makes it possible to more precisely control the preheating opening time when the water is reserved. While avoiding the user's waiting, the energy waste caused by premature completion of the preheating is avoided.

In order to prevent continuous heating due to the failure of the detected temperature sensor, in the circulating preheating control step, when the ignition time of the gas water heater is greater than the set threshold, the combustion is stopped, and the circulating pump continues to work for a time t3 and then stops.

It also includes detecting the water flow at the water end. In the cycle preheating control step, when the water flow at the water end is detected, the preheating cycle should be stopped, the circulating pump should be closed accordingly, and the water should be supplied to the water end for output.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed in the present invention.

Claims (9)

1. A gas water heater preheating control method, characterized in that, comprising: Get the appointment time for water use; Obtain the time t required for preheating; The cycle preheating control step is executed from the advance time t of the reserved water time; Also includes obtaining the water temperature T; The cyclic preheating control steps include: The first-stage circulating preheating step controls to heat the incoming water to the first temperature T1; According to the water temperature T, it is judged whether to perform the secondary circulation preheating step; The secondary circulation preheating step controls to heat the feed water to a second temperature T2, where T1<T2. 2 . The preheating control method for a gas water heater according to claim 1 , wherein the method for judging whether to perform the secondary cycle preheating step is: 2 . When T<T2, the secondary cycle preheating step is not performed; When T≥T2, the secondary cycle preheating step is performed. 3. The preheating control method for a gas water heater according to claim 1, wherein the step of preheating the first-stage circulation comprises: Detect the inlet water temperature. When the inlet water temperature is less than T1, turn on the circulating pump and check the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited. The preheating control method for a gas water heater according to claim 3, characterized in that, in the first-stage circulating preheating step, the rotation speed of the circulating pump is lower than its maximum rotation speed, and the combustion load of the gas water heater is lower than its maximum combustion load. 5. The preheating control method for a gas water heater according to claim 1, wherein the step of secondary circulation preheating comprises: Detect the inlet water temperature. When the inlet water temperature is less than T2, turn on the circulating pump to detect the water flow. When the water flow meets the ignition conditions, the gas water heater will be ignited. Otherwise, the gas water heater will not be ignited. 6 . The gas water heater preheating control method according to claim 5 , wherein, in the secondary circulating preheating step, the rotation speed of the circulating pump is equal to its maximum rotation speed, and the combustion load of the gas water heater is lower than its maximum combustion load. 7 . 7. The preheating control method for a gas water heater according to any one of claims 1-6, characterized in that: When T<T2, the time required for preheating is t=t1; When T≥T2, the time required for preheating is t=t1+t2; The first-stage circulation preheating step also includes recording the time required to heat the influent water to the first temperature T1, and updating and saving it to t1, and the second-stage circulation preheating step also includes recording and heating the influent water to the second temperature. The time required for the temperature T1, and the update is saved to t2. 8. The gas water heater preheating control method according to any one of claims 3 to 6, wherein in the cycle preheating control step, when the ignition time of the gas water heater is greater than a set threshold, combustion is stopped, and the circulation pump continues The work stops after the time t3 is satisfied. 9 . The preheating control method for a gas water heater according to claim 8 , wherein the circulation preheating control step is returned to after the circulating pump stops working for a time t4 . 10 .

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