CN113701358A

CN113701358A - Water heater and control method thereof

Info

Publication number: CN113701358A
Application number: CN202110994123.1A
Authority: CN
Inventors: 卢宇凡; 唐元锋; 张华平; 李罗标
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2021-11-26
Anticipated expiration: 2041-08-27
Also published as: CN113701358B

Abstract

The invention relates to a water heater and a control method thereof, wherein the control method of the water heater comprises the following steps: acquiring a first functional relation between a first flow value and a static pressure value of the first branch circuit; acquiring a second functional relation between a second flow value and a static pressure value of the first branch circuit; calculating a first flow value corresponding to the actual static pressure value of the first branch according to the first functional relation, namely obtaining a first theoretical flow value of the first branch; calculating a second flow value corresponding to the actual static pressure value of the first branch according to the second functional relation, and obtaining a second theoretical flow value of the first branch; judging the starting flow value Q of the water heater_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater_{Starting up}Until the starting flow value Q of the water heater_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value. The situation that the water heater is started by mistake due to the fact that the cold water end of the starting water point is started can be reduced.

Description

Water heater and control method thereof

Technical Field

The invention relates to the technical field of water heaters, in particular to a water heater and a control method thereof.

Background

The existing zero-cold water gas water heater is generally divided into a three-pipeline scheme (a hot water pipe, a cold water pipe and a water return pipe) and a two-pipeline scheme (a hot water pipe and a cold water pipe).

The existing two-pipeline zero-cold-water heater is communicated with a cold water pipe and a hot water pipe through branch pipes.

However, when the existing two-pipeline zero-cold-water heater is used, the cold water end of the mixing valve is often opened, and the outgoing cold water can be mixed with partial hot water, so that the comfort of a user in using the cold water is affected.

Disclosure of Invention

Accordingly, it is necessary to provide a water heater and a control method thereof for solving the problem that comfort is affected by mixing cold water with partially hot water when a cold water end is opened.

According to an aspect of the present application, there is provided a control method of a water heater, the water heater including a cold water pipe, a hot water pipe and at least one water consumption point connected to the cold water pipe and the hot water pipe, the hot water pipe having one end connected to a water outlet side of the water heater and the other end connected to a hot water end of the water consumption point, the cold water pipe having one end for connecting a water source and the other end divided into a first branch and a second branch, the first branch being connected to a water inlet side of the water heater, the second branch being connected to a cold water end of the water consumption point, the hot water pipe further being connected to the second branch via a connection pipe, and the connection pipe being configured to allow a water flow to flow from the hot water pipe to the second branch in one direction, the control method of the water heater including the steps of:

acquiring a first functional relation between a first flow value and a static pressure value of the first branch circuit; wherein the first flow value is characterized by the flow value of the first branch when the cold water end of the water heater at the water consumption point is opened, the hot water end of the water consumption point is closed, and the water outlet end of the water consumption point is opened to the maximum opening degree; the static pressure value is characterized by being the pressure value of the first branch when the water outlet end of the water heater at the water using point is closed;

acquiring a second functional relation between a second flow value and a static pressure value of the first branch circuit; wherein the second flow value is characterized by the flow value of the first branch when the water heater is at the state that the hot water end of the water consumption point is opened, the cold water end of the water consumption point is closed and the water outlet end of the water consumption point is opened to the maximum opening degree;

calculating the first flow value corresponding to the actual static pressure value of the first branch according to the first functional relation, and obtaining a first theoretical flow value of the first branch;

calculating the second flow value corresponding to the actual static pressure value of the first branch according to the second functional relation, and obtaining a second theoretical flow value of the first branch;

judging the starting flow value Q of the water heater_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater_{Starting up}Until the starting flow value Q of the water heater_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value;

wherein the second theoretical flow value is greater than the first theoretical flow value.

In the water heater and the control method thereof, the first flow value for obtaining the first functional relationship is selected when the water outlet end of the water consumption point is opened to the maximum opening degree, and the water outlet end of the water consumption point is not normally opened to the maximum opening degree based on the consideration that the water heater does not need to be started, the water saving and the like in the process of using the water heater by a user, on the basis, the larger first flow value is larger than the actual flow value of the first branch when the user opens the cold water end of the water consumption point, the first theoretical flow of the first branch is the first flow value which is calculated according to the first functional relationship and corresponds to the actual static pressure value of the first branch, the first theoretical flow of the first branch is also larger than the actual flow value of the first branch when the user opens the cold water end of the water consumption point, and the flow value Q is started_{Starting up}The starting flow value Q of the water heater is larger than the first theoretical flow_{Starting up}The flow rate of the water heater is larger than the actual flow rate value of the first branch, and at the moment, the water heater cannot be started, so that the situation that the water heater is started by mistake due to the fact that a cold water end of a starting water point is started can be reduced.

In one of the two casesIn the embodiment, if the starting flow value Q of the water heater_{Starting up}If the flow rate is larger than the first theoretical flow rate and smaller than or equal to the second theoretical flow rate, the starting flow rate Q of the water heater is kept_{Starting up}And is not changed.

In one embodiment, the judgment of the starting flow value Q of the water heater_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater_{Starting up}Until the starting flow value Q of the water heater_{Starting up}The method is realized by adopting the following steps that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value:

setting the initial starting flow value of the water heater to be Q_{Starting up}＝Q₀；

Judging the initial starting flow value Q of the water heater₀Whether the flow rate is larger than the first theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater_{Starting up}＝Q₀+ u until starting flow value Q of said water heater_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

In one embodiment, the control method of the water heater further comprises the step of confirming that the second theoretical flow value is greater than the first theoretical flow value:

acquiring the first flow value and the second flow value of the first branch circuit at different static pressure values;

establishing a first functional relationship graph of the first flow value, the second flow value and the static pressure value according to the first flow value and the second flow value of the first branch circuit at different static pressure values;

and determining that the second theoretical flow value is larger than the first theoretical flow value under different static pressure values according to the first functional relation graph.

In one embodiment, the control method of the water heater further comprises:

under the condition that a first condition is met, determining the value range of the static pressure value;

wherein the first condition is a starting flow value Q of the water heater_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

acquiring a first dynamic pressure value and a second dynamic pressure value of the first branch at different static pressure values; the first dynamic pressure value is represented as a pressure value of the first branch when a cold water end of the water heater at the water consumption point is opened, a hot water end of the water consumption point is closed, and a water outlet end of the water consumption point is opened to a maximum opening degree; the second dynamic pressure value is characterized in that the pressure value of the first branch is obtained when the hot water end of the water heater at the water consumption point is opened, the cold water end of the water consumption point is closed, and the water outlet end of the water consumption point is opened to the maximum opening;

establishing a second functional relation graph of the first dynamic pressure value, the second dynamic pressure value and the static pressure value according to the first dynamic pressure value and the second dynamic pressure value of the first branch circuit at different static pressure values;

and determining that the second theoretical flow value is larger than the first theoretical flow value under different static pressure values according to the second functional relation graph.

In one embodiment, the first flow value is characterized by the flow value of the first branch when the water heater is at the water consumption point farthest from the water heater with the cold water end open, the hot water end of the water consumption point closed, and the water outlet end of the water consumption point open to the maximum opening. The first flow value obtained at the moment is larger, and the situation that the water heater is started by mistake due to the fact that the cold water end of the water consumption point is opened is better reduced.

According to another aspect of the present application, there is provided a water heater, the water heater including a cold water pipe, a hot water pipe, and at least one water consumption point connected to the cold water pipe and the hot water pipe, the hot water pipe having one end connected to an outlet side of the water heater and the other end connected to a hot water end of the water consumption point, the cold water pipe having one end for connecting a water source and the other end divided into a first branch and a second branch, the first branch being connected to an inlet side of the water heater, the second branch being connected to a cold water end of the water consumption point, the hot water pipe being further connected to the second branch via a connection pipe, and the connection pipe being configured to allow a water flow to flow from the hot water pipe to the second branch in one direction; the water heater further comprises a control device, the control device comprising:

the first function building module is used for obtaining a first functional relation between a first flow value and a static pressure value of the first branch circuit; wherein the first flow value is characterized by the flow value of the first branch when the cold water end of the water heater at the water consumption point is opened, the hot water end of the water consumption point is closed, and the water outlet end of the water consumption point is opened to the maximum opening degree; the static pressure value is characterized by being the pressure value of the first branch when the water outlet end of the water heater at the water using point is closed;

the second function building module is used for obtaining a second functional relation between a second flow value and a static pressure value of the first branch circuit; wherein the second flow value is characterized by the flow value of the first branch when the water heater is at the state that the hot water end of the water consumption point is opened, the cold water end of the water consumption point is closed and the water outlet end of the water consumption point is opened to the maximum opening degree;

the first calculation module is used for calculating the first flow value corresponding to the actual static pressure value of the first branch according to the first functional relation, and then the first theoretical flow value of the first branch is obtained;

the second calculation module is used for calculating the second flow value corresponding to the actual static pressure value of the first branch according to the second function relation, and then the second theoretical flow value of the first branch is obtained; and

a control module for judging the starting flow value Q of the water heater_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater_{Starting up}Until the starting flow value Q of the water heater_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value;

In one embodiment, a flow gauge for acquiring a flow value of the first branch and a pressure gauge for acquiring a pressure value of the first branch are arranged on the first branch.

In one embodiment, a pressure regulating valve is arranged on the second branch and used for regulating the static pressure value of the first branch.

Drawings

FIG. 1 is a schematic structural diagram of a water heater and a water consumption point according to an embodiment of the present invention;

FIG. 2 shows a flow chart schematic of a control method of the water heater 100;

FIG. 3 shows a first flow rate value Q1, a second flow rate value Q2 and a static pressure value P according to an embodiment of the present invention_QuietA first functional relationship diagram of (1);

FIG. 4 shows a first dynamic pressure P in an embodiment of the present invention_{Movable part 1}Second dynamic pressure P_{Moving 2}With static pressure value P_QuietThe second functional relationship diagram of (1).

In the figure: 100. a water heater; 110. a water inlet side; 120. a water outlet side; 200. water consumption; 211. a cold water end; 212. a hot water end; 213. a water outlet end; 300. a pressure regulating valve; 410. a cold water pipe; 411. a first branch; 412. a second branch circuit; 420. a hot water pipe; 430. connecting a pipeline; 431. a one-way valve; 510. a flow gauge; 520. pressure gauge.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a water heater 100 and a water consumption point 200 according to an embodiment of the present invention, in which the water heater 100 includes a cold water pipe 410, a hot water pipe 420, and at least one water consumption point 200 connected to the cold water pipe 410 and the hot water pipe 420, one end of the hot water pipe 420 is connected to the water outlet side 120 of the water heater 100, the other end of the hot water pipe 420 is connected to the hot water end 212 of the water consumption point 200, one end of the cold water pipe 410 is used for connecting a water source, the other end of the cold water pipe is divided into a first branch 411 and a second branch 412, the first branch 411 is connected to the water inlet side 110 of the water heater 100, and the second branch 412 is connected to the cold water end 211 of the water consumption point 200. The hot water pipe 420 is also connected to the second branch 412 by a connecting pipe 430, and the connecting pipe 430 is configured to allow water flow to flow unidirectionally from the hot water pipe 420 to the second branch 412, such as by connecting an end of the hot water pipe 420 near the hot water end 212 of the water usage point 200 to an end of the second branch 412 near the cold water end 211 of the water usage point 200 by the connecting pipe 430.

In this embodiment, a check valve 431 is provided on the connection pipe 430 such that the direction of water flow in the connection pipe 430 is unidirectional and flows from the hot water pipe 420 to the second branch 412.

In other embodiments, a three-way valve with a check valve may be disposed between the connection line 430 and the hot water pipe 420, an inlet of the three-way valve is connected to the hot water pipe 420, a first outlet of the three-way valve is connected to the connection line 430, and a second outlet of the three-way valve is connected to the hot water end 212 of the water consumption point 200. It is also ensured that the direction of the water flow in the connecting line 430 is unidirectional and flows from the hot water pipe 420 to the second branch 412.

When the water heater 100 is in the start-up state, the water can be heated by the water heater 100 and then flows from the water outlet side 120 of the water heater 100 to the hot water pipe 420, and then can be supplied to the hot water end 212 of a certain water point 200; on the other hand, the water source supplies water to the cold water end 211 of a water utility 200 through a second branch 412. The water flow in the connecting pipe 430 is unidirectional, flows from the hot water pipe 420 to the second branch 412, and can flow back through the second branch 412, so that the water heater 100 and the water consumption point 200 form a circulation loop.

Fig. 2 shows a flow chart diagram of a control method of the water heater 100.

Referring to fig. 2, the control method of the water heater 100 includes the following steps:

s610, acquiring a first functional relation between a first flow value and a static pressure value of the first branch 411; the first flow value Q1 is represented by the flow value of the first branch 411 when the water heater 100 is opened at the cold water end 211 of the water consumption point 200, closed at the hot water end 212 of the water consumption point 200 and opened to the maximum opening at the water outlet end 213 of the water consumption point 200. The static pressure value is characterized as the pressure value of the first branch 411 when the water heater 100 is closed at the water outlet end 213 of the service water point 200.

S620, acquiring a second functional relation between a second flow value and a static pressure value of the first branch 411; wherein the second flow value Q2 is characterized by the flow value of the first branch 411 when the water heater 100 is at the hot water end 212 of the water usage point 200 is open, the cold water end 211 of the water usage point 200 is closed, and the water outlet end 213 of the water usage point 200 is open to the maximum opening.

S630, according to the first functional relationship, a first flow value corresponding to the actual static pressure value of the first branch 411 is calculated, i.e. a first theoretical flow value of the first branch 411 is obtained.

S640, calculating a second flow value corresponding to the actual static pressure value of the first branch 411 according to the second functional relationship, i.e. obtaining a second theoretical flow value of the first branch 411.

S650, judging the starting flow value Q of the water heater 100_{Starting up}Whether it is greater than the first theoretical flow value and less than or equal to the second theoretical flow value,

s660, judging the starting flow value Q of the water heater 100_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value; if not, correcting the starting flow value Q of the water heater 100_{Starting up}Until the starting flow rate value Q of the water heater 100_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value. Wherein the second theoretical flow value is greater than the first theoretical flow value. Because the first flow rate value Q1 for obtaining the first functional relationship is selected when the outlet end 213 of the water point 200 is opened to the maximum opening degree, and the user does not normally open the outlet end 213 of the water point 200 to the maximum opening degree during the use of the water heater 100 based on the consideration that the water heater 100 does not need to be started and the water is saved, the larger first flow rate value Q1 is larger than the actual flow rate value of the first branch 411 when the user opens the cold water end 211 of the water point 200, and the first theoretical flow rate of the first branch 411 is the first flow rate value corresponding to the actual static pressure value of the first branch 411 calculated according to the first functional relationship, then the first theoretical flow rate of the first branch 411 is also larger than the actual flow rate value of the first branch 411 when the user opens the cold water end 211 of the water point 200, and the flow rate value Q1 is selected when the start flow rate value is set_{Starting up}The starting flow value Q of the water heater 100 is larger than the first theoretical flow_{Starting up}The actual flow value of the first branch 411 is larger, and at this time, the water heater 100 is not started, so that the situation that the water heater 100 is started by mistake due to the fact that the cold water end 211 of the water starting point 200 is started can be reduced.

When the user needs to start the water heater 100 for bathing, the hot water end 212 of the water consumption point 200 is usually opened, and the water consumption point 2 is usually opened00 is closed and the outlet end 213 of the service water point 200 is opened to the maximum opening, and a second flow value Q2 for obtaining a second functional relationship is selected when the outlet end 213 of the service water point 200 is opened to the maximum opening, the actual flow value of the first branch 411 is equal to the second flow value Q2, and a second theoretical flow of the first branch 411 is calculated according to the second functional relationship and corresponds to the actual static pressure value of the first branch 411, then the actual flow value of the first branch 411 is equal to the second theoretical flow of the first branch 411, and when the second theoretical flow is greater than or equal to the starting flow value Q of the water heater 100_{Starting up}In this case, the actual flow rate value of the first branch 411 at this time is greater than or equal to the starting flow rate value Q of the water heater 100_{Starting up}And thus the water heater 100 can start up normally when the hot water end 212 of the water consumption point 200 is opened.

Further, the step S610 of obtaining the first functional relationship between the first flow value and the static pressure value of the first branch 411 includes establishing the first functional relationship between the first flow value and the static pressure value of the first branch 411.

The step of obtaining a second functional relationship between the second flow value and the static pressure value of the first branch 411 comprises establishing a second functional relationship between the second flow value and the static pressure value of the first branch 411.

Further, the control method of the water heater 100 further includes the steps of:

s670, if the starting flow value Q of the water heater 100_{Starting up}If the flow rate is larger than the first theoretical flow rate and smaller than or equal to the second theoretical flow rate, the starting flow rate Q of the water heater 100 is maintained_{Starting up}And is not changed.

Further, the starting flow rate value Q of the water heater 100 is judged_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value; if not, correcting the starting flow value Q of the water heater 100_{Starting up}Until the starting flow rate value Q of the water heater 100_{Starting up}The method is realized by adopting the following steps that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value:

Determining the initial start-up flow rate Q of the water heater 100₀Whether the flow rate is larger than the first theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater 100_{Starting up}＝Q₀+ u until the starting flow value Q of the water heater 100_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value. It is possible to better reduce the occurrence of the false start of the water heater 100 due to the opening of the cold water end 211 of the water usage point 200. Wherein u is a correction value and is adapted to make Q₀+ u is greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

In some embodiments of the present application, the control method of the water heater 100 further comprises the step of verifying that the second theoretical flow value is greater than the first theoretical flow value:

the commissioning temperature of the water heater 100 is set and made greater than 35 ℃.

Acquiring a first flow value Q1 and a second flow value Q2 of the first branch 411 at different static pressure values; specifically, the static pressure value of the first branch 411 is changed and the changed static pressure value P is obtained_Quiet(ii) a The first flow value Q1 is obtained when the water heater 100 is at a state where the cold water end 211 of the water usage point 200 is open, the hot water end 212 of the water usage point 200 is closed, and the water outlet end 213 of the water usage point 200 is open to a maximum opening. When the water heater 100 is at the state that the hot water end 212 of the water consumption point 200 is opened, the cold water end 211 of the water consumption point 200 is closed, and the water outlet end 213 of the water consumption point 200 is opened to the maximum opening degree, acquiring a second flow value Q2; by varying the static pressure P several times_QuietThe first flow value Q1 and the second flow value Q2 are acquired a plurality of times.

At different static pressure values P according to the first branch 411_QuietA first flow value Q1 and a second flow value Q2, establishing a first flow value Q1, a second flow value Q2 and a static pressure value P_QuietAnd determining the second flow value Q2 at different static pressure values P based on the first function_QuietAt all lower flow values greater than the first flow value Q1, the same static pressure value P can be determined_QuietThe lower second flow value Q2 is greater than the first flow value Q1, thereby determining the same static pressure value P_QuietThe lower second theoretical flow value is larger than the first theoretical flow value, which is convenient forMake the starting flow rate value Q of the water heater 100_{Starting up}The condition that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value is satisfied.

In this embodiment, step 1, a flow rate gauge 510 for acquiring a flow rate value of the first branch 411 and a pressure gauge 520 for acquiring a pressure value of the first branch 411 are disposed on the first branch 411. The first flow value Q1 and the second flow value Q2 can be obtained through the flow detection tool 510, and the flow detection tool 510 can be a flow meter or a flow sensor, so that the flow value can be conveniently obtained; static pressure value P can be obtained through pressure gauge 520_QuietThe pressure gauge 520 can be a pressure gauge or a pressure sensor, and the pressure value can be conveniently acquired. A pressure regulating valve 300 is arranged on the second branch 412, the pressure regulating valve 300 being used to regulate the static pressure value P of the first branch 411_Quiet. By adjusting the opening of the pressure-regulating valve 300 to thereby change the static pressure value P_QuietThe pressure regulating valve 300 is specifically selected as a ball valve, so that the static pressure value P can be conveniently changed as required_Quiet(ii) a The circulation line connecting the water heater 100 and the water consumption point 200 as shown in fig. 1 ensures that the circulation line is watertight.

And 2, turning on a power supply of the water heater 100 to enable the debugging temperature of the water heater 100 to be 45 ℃, wherein the water heater 100 is JSQ30-16L2-10T in model number.

Step 3, the opening degree of the pressure regulating valve 300 is adjusted to further change the static pressure value, the opening degree of the pressure regulating valve 300 is adjusted, and then the static pressure value P is obtained through the pressure gauge 520_Quiet。

Step 4, operating the wrench of the mixing valve of the water usage point 200 to open the cold water end 211 of the water usage point 200, close the hot water end 212 of the water usage point 200, and open the water outlet end 213 of the water usage point 200 to the maximum opening degree, and obtaining a first flow value Q1 through the flow gauge 510. The water mixing valve of the water consumption point 200 comprises a cold water end 211, a hot water end 212, a water outlet end 213 and a wrench, wherein the cold water end 211, the hot water end 212 and the water outlet end 213 are opened or closed by the wrench.

Step 5, operating the wrench of the mixing valve of the water usage point 200 to open the hot water end 212 of the water usage point 200, close the cold water end 211 of the water usage point 200, and open the water outlet end 213 of the water usage point 200 to the maximum opening degree, and obtaining a second flow rate value Q2 through the flow rate gauge 510.

Step 6, the mixing valve of the water consumption point 200 is closed, i.e. the water outlet end 213 of the water consumption point 200 is closed.

Step 7, repeating the steps 3-6 for multiple times, so that the opening degree of the pressure regulating valve 300 can be adjusted for multiple times, and the static pressure value P can be obtained for multiple times_QuietA first flow rate Q1 and a second flow rate Q2 at different static pressure values P_QuietThe specific values of the first flow rate value Q1 and the second flow rate value Q2 are detailed in table 1 below.

Table 1 shows the values of static pressure P_QuietTable below for the values of the first flow value Q1 and the second flow value Q2.

Note: in Table 1, the values of static pressure P at different values are also listed_QuietLower water flow rate value Q_{Go out}Flow rate of effluent Q_{Go out}Characterized by the flow rate value of the outlet end 213 of the water usage point 200 when the water heater 100 is at the cold water end 211 of the water usage point 200 open, the hot water end 212 of the water usage point 200 closed, and the outlet end 213 of the water usage point 200 open to a maximum opening.

FIG. 3 shows the first flow Q1, the second flow Q2 and the static pressure P_QuietObviously, the second flow value Q2 and the static pressure value P_QuietIs higher than the first flow value Q1 and the static pressure value P_QuietAt the same static pressure value P_QuietNext, the second flow values Q2 are each greater than the first flow value Q1. Thereby determining the same static pressure value P_QuietThe lower second flow value Q2 is greater than the first flow value Q1, thereby determining the same static pressure value P_QuietThe lower second theoretical flow value is greater than the first theoretical flow value, which facilitates the starting flow value Q of the water heater 100_{Starting up}The condition that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value is satisfied.

Further, the control method of the water heater 100 further includes:

in the case of satisfaction of the first conditionThen, the static pressure value P is determined_QuietWherein the first condition is a starting flow value Q of the water heater 100_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value. A range of values for the static pressure values may be determined if the first condition is satisfied. Thus, when the cold water end 211 of the water spot 200 is started during the use of the water heater 100, since the actual static pressure value of the first branch 411 falls within the range of the static pressure values, correspondingly, the actual flow rate value of the first branch 411 will also be smaller than the start flow rate value Q of the water heater 100_{Starting up}At this time, the water heater 100 cannot be turned on, and the water heater 100 cannot be started by mistake due to the fact that the cold water end 211 of the starting water point 200 is turned on, so that the problem of false starting can be solved better.

In this embodiment, the range of static pressure values is determined as follows:

the type of the water heater 100 is JSQ30-16L2-10T, and the corresponding Q_{Starting up}At 2.5L/min, as can be seen from Table 1 above with reference to FIG. 3, a first flow value Q1 and a static pressure value P are shown in FIG. 3_QuietAnd a second flow value Q2 and a static pressure value P_QuietCan be seen from the second function curve of (1): under the condition of satisfying the first condition, the static pressure value P is adjusted_QuietIs determined to be 0-0.2MPa (excluding 0MPa and 0.2MPa) at a static pressure value P_QuietIn the range of 0-0.2MPa (excluding 0MPa and 0.2MPa), it can be ensured that the water heater 100 is not started by mistake when the cold water end 211 of the starting water point 200 is started, and the water heater 100 can be started normally when the hot water end 212 of the starting water point 200 is started. And so on, when Q_{Starting up}For other values, the corresponding static pressure value P can also be determined_QuietA range value of (c).

As can be seen from Table 1, at the static pressure value P_QuietWhen the range value of (1) is 0-0.2MPa, the water outlet flow value Q is obtained when the cold water end 211 of the water point 200 is opened_{Go out}All are more than 10L/min, and can meet the daily requirement of the water consumption point 200.

Further, the static pressure value P is changed a plurality of times_QuietThe step of obtaining the first flow value Q1 and the second flow value Q2 a plurality of times further comprises obtaining the effluent flow value Q when obtaining the first flow value Q1_{Go out}Wherein the effluent flow rate value Q_{Go out}Characterized by the flow rate value of the outlet end 213 of the water usage point 200 when the water heater 100 is at the cold water end 211 of the water usage point 200 open, the hot water end 212 of the water usage point 200 closed, and the outlet end 213 of the water usage point 200 open to a maximum opening.

Also measured in Table 1 are the hydrostatic pressure values P_QuietWhen the cold water end 211 of the water consumption point 200 is opened at the lower time, the hot water end 212 of the water consumption point 200 is closed, and the water outlet end 213 of the water consumption point 200 is opened to the maximum opening degree, the water outlet flow rate value Q of the water outlet end 213 of the water consumption point 200_{Go out}The starting flow rate Q of the water heater 100 can be set according to the required water consumption of the water consumption point 200_{Starting up}And u is taken as a value, for example, the water consumption of the water consumption point 200 is 30L/min, and the value Q of the water flow rate is obtained by reverse estimation based on the value_{Go out}When the flow rate is equal to 30L/min, based on the effluent flow rate value Q_{Go out}(L/min) and static pressure value P_QuietThe corresponding static pressure value P is calculated by the functional relation of (MPa)_Quiet(MPa), based on the first flow value Q1 and the static pressure value P_QuietAnd a second flow value Q2 and a static pressure value P_QuietThe corresponding first theoretical flow value and the second theoretical flow value are calculated out according to the functional relationship of the water heater 100, and then the proper starting flow value Q of the water heater 100 is selected_{Starting up}And the value of u.

In other embodiments of the present application, the method of controlling the water heater 100 further includes the step of verifying that the second theoretical flow value is greater than the first theoretical flow value:

Acquiring a first dynamic pressure value and a second dynamic pressure value of the first branch 411 at different static pressure values; the static pressure value is characterized as the pressure value of the first branch 411 when the water outlet end 213 of the water heater 100 is closed at the water using point 200; static pressure value P can be obtained through pressure gauge 520_Quiet(ii) a The first dynamic pressure value is represented as a pressure value of the first branch 411 when the cold water end 211 of the water consumption point 200 of the water heater 100 is opened, the hot water end 212 of the water consumption point 200 is closed, and the water outlet end 213 of the water consumption point 200 is opened to the maximum opening degree; first dynamic pressure value P can be obtained through pressure gauge 520_{Movable part 1}(ii) a Second dynamic pressure valueCharacterized by the pressure value of the first branch 411 when the hot water end 212 of the water usage point 200 is open, the cold water end 211 of the water usage point 200 is closed, and the water outlet end 213 of the water usage point 200 is open to the maximum opening of the water heater 100; a second dynamic pressure value P can be obtained through the pressure gauge 520_{And (6) moving 2.}

At different static pressure values P according to the first branch 411_QuietFirst dynamic pressure value P_{Movable part 1}And a second dynamic pressure value P_{Moving 2}Establishing a first dynamic pressure value P_{Movable part 1}Second dynamic pressure P_{Moving 2}With static pressure value P_QuietAnd determining a second theoretical flow value at different static pressure values P according to the second functional relation diagram_QuietThe lower values are all larger than the first theoretical flow value.

Table 2 shows the values of the static pressure P_QuietFirst dynamic pressure value P_{Movable part 1}And a second dynamic pressure value P_{Moving 2}The values of (A) are compared with the table.

P_Quiet(MPa)	P_{Movable part 1}(MPa)	P_{Moving 2}(MPa)
			0.05	17.39	4.25
0.10	36.99	7.08
			0.12	40.18	7.91
0.14	45.92	8.50
			0.16	52.25	9.25
0.18	58.45	9.83
			0.20	70.73	10.33

Referring to Table 2, different hydrostatic values P are also given in Table 2_QuietFirst dynamic pressure value P_{Movable part 1}And a second dynamic pressure value P_{Moving 2}With combined reference to fig. 4, a first dynamic pressure value P is shown in fig. 4_{Movable part 1}With static pressure value P_QuietAnd a second dynamic pressure value P_{Moving 2}With static pressure value P_QuietIt is clear that, compared to table 2, from fig. 4, it is more intuitive to see that at the same static pressure value P_QuietLower, first dynamic pressure value P_{Movable part 1}Greater than the second dynamic pressure value P_{Moving 2}This also indicates that the water pressure of the first branch 411 when the cold water end 211 of the start water point 200 is separately opened is greater than the water pressure of the first branch 411 when the hot water end 212 of the start water point 200 is separately opened, because the water resistance of the first branch 411 when the hot water end 212 of the start water point 200 is separately opened is less than the water resistance of the first branch 411 when the cold water end 211 of the start water point 200 is separately opened, so that the first flow value Q1 of the first branch 411 when the cold water end 211 of the start water point 200 is opened (at this time, the water resistance of the first branch 411 is greater, and correspondingly, the flow value of the first branch 411 is less at this time) is less than the second flow value Q2 of the first branch 411 when the hot water end 212 of the start water point 200 is opened, and the water pressure of the first branch 411 is more effectively controlled by the controllerThis verifies that the second flow rate value Q2 is greater than the first flow rate value Q1 at different static pressure values, thereby determining the same static pressure value P_QuietThe lower second flow value Q2 is greater than the first flow value Q1, thereby determining the same static pressure value P_QuietThe lower second theoretical flow value is greater than the first theoretical flow value, which facilitates the starting flow value Q of the water heater 100_{Starting up}The condition that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value is satisfied.

Further, the first flow value Q1 is characterized by the flow value of the first branch 411 when the water heater 100 is at the opening of the cold water end 211 of the water consumption point 200 farthest from the water heater 100, the closing of the hot water end 212 of the water consumption point 200, and the opening of the water outlet end 213 of the water consumption point 200 to the maximum opening. At this time, a larger pressure is required for pressure feeding, and the first flow value Q1 obtained at this time is larger, so that the situation that the water heater is started by mistake due to the opening of the cold water end 211 of the water consumption point 200 is better reduced.

Further, the water heater 100 further comprises a control device, wherein the control device comprises a first function building module, a second function building module, a first calculating module, a second calculating module and a control module.

The first function building module is configured to obtain a first functional relationship between the first flow rate value and the static pressure value of the first branch 411.

The second function building block is configured to obtain a second functional relationship between the second flow value and the static pressure value of the first branch 411.

The first calculating module is configured to calculate a first flow value corresponding to the actual static pressure value of the first branch 411 according to the first functional relationship, that is, a first theoretical flow value of the first branch 411 is obtained.

The second calculating module is configured to calculate a second flow value corresponding to the actual static pressure value of the first branch 411 according to the second functional relationship, that is, a second theoretical flow value of the first branch 411 is obtained.

The control module is used for judging the starting flow value Q of the water heater 100_{Starting up}Whether the flow rate is larger than the first theoretical flow rate and smaller than or equal to the second theoretical flow rate, if not, correcting the starting flow rate Q of the water heater 100_{Starting up}Until it reaches hot waterStarting flow rate value Q of the device 100_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A control method of a water heater, the water heater (100) comprising a cold water pipe (410), a hot water pipe (420) and at least one point of water use (200) connected to the cold water pipe (410) and the hot water pipe (420), the hot water pipe (420) being connected at one end to an outlet side (120) of the water heater (100) and at the other end to a hot water end (212) of the point of water use (200), the cold water pipe (410) being connected at one end to a water source and at the other end to a first branch (411) and a second branch (412), the first branch (411) being connected to an inlet side (110) of the water heater (100) and the second branch (412) being connected to a cold water end (211) of the point of water use (200), characterized in that the hot water pipe (420) is further connected to the second branch (412) by a connection pipe, and the connection pipe is configured to allow a unidirectional flow of water from the hot water pipe (420) to the second branch (412), the control method of the water heater (100) comprises the following steps:

obtaining a first functional relationship between a first flow value and a static pressure value of the first branch (411); wherein the first flow value is characterized by the flow value of the first branch (411) when the water heater (100) is at the state that the cold water end (211) of the water consumption point (200) is opened, the hot water end (212) of the water consumption point (200) is closed and the water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree; the static pressure value is characterized by the pressure value of the first branch (411) when the water heater (100) is closed at the water outlet end (213) of the water consumption point (200);

obtaining a second functional relationship between a second flow value and a static pressure value of the first branch (411); wherein the second flow value is characterized by the flow value of the first branch (411) when the water heater (100) is at the state that the hot water end (212) of the water consumption point (200) is opened, the cold water end (211) of the water consumption point (200) is closed and the water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree;

calculating the first flow value corresponding to the actual static pressure value of the first branch (411) according to the first functional relation, namely obtaining a first theoretical flow value of the first branch (411);

calculating the second flow value corresponding to the actual static pressure value of the first branch (411) according to the second functional relation, namely obtaining a second theoretical flow value of the first branch (411);

determining a starting flow value Q of the water heater (100)_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater (100)_{Starting up}Up to the starting flow value Q of the water heater (100)_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value;

2. Method for controlling a water heater according to claim 1, characterized in that if the starting flow value Q of the water heater (100) is reached_{Starting up}If the flow rate is larger than the first theoretical flow rate and smaller than or equal to the second theoretical flow rate, the starting flow rate Q of the water heater (100) is maintained_{Starting up}And is not changed.

3. The heat of claim 1Method for controlling a water heater, characterized in that said determination of the starting flow value Q of said water heater (100)_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater (100)_{Starting up}Up to the starting flow value Q of the water heater (100)_{Starting up}The method is realized by adopting the following steps that the flow rate is greater than the first theoretical flow rate value and less than or equal to the second theoretical flow rate value:

setting an initial start-up flow value of the water heater (100) to Q_{Starting up}＝Q₀；

Determining an initial start-up flow value Q of the water heater (100)₀Whether the flow rate is larger than the first theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater (100)_{Starting up}＝Q₀+ u until starting flow value Q of said water heater (100)_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

4. The control method of a water heater according to claim 1, characterized in that it further comprises the step of confirming that said second theoretical flow value is greater than said first theoretical flow value:

-acquiring said first and second flow values of said first branch (411) at different said static pressure values;

-establishing a first functional relationship diagram of said first flow value, said second flow value and said static pressure value, according to said first flow value and said second flow value of said first branch (411) at different said static pressure values;

5. The control method of a water heater according to claim 4, further comprising:

wherein the first condition is a start-up flow value Q of the water heater (100)_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value.

6. The control method of a water heater according to claim 1, characterized in that it further comprises the step of confirming that said second theoretical flow value is greater than said first theoretical flow value:

acquiring a first dynamic pressure value and a second dynamic pressure value of the first branch (411) at different static pressure values; wherein the first dynamic pressure value is characterized by the pressure value of the first branch (411) when the water heater (100) is at the state that a cold water end (211) of the water consumption point (200) is opened, a hot water end (212) of the water consumption point (200) is closed and a water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree; the second dynamic pressure value is characterized by being the pressure value of the first branch (411) when the hot water end (212) of the water heater (100) at the water consumption point (200) is opened, the cold water end (211) of the water consumption point (200) is closed, and the water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree;

establishing a second functional relation graph of the first dynamic pressure value, the second dynamic pressure value and the static pressure value according to the first dynamic pressure value and the second dynamic pressure value of the first branch (411) at different static pressure values;

7. The control method of a water heater according to claim 1, characterized in that the first flow value is characterized by the flow value of the first branch (411) when the water heater (100) is at the cold water end (211) of the consumption point (200) farthest from the water heater (100) open, the hot water end (212) of the consumption point (200) closed and the water outlet end (213) of the consumption point (200) open to a maximum opening.

8. A water heater, the water heater (100) comprising a cold water pipe (410), a hot water pipe (420), and at least one point of use (200) connected to the cold water pipe (410) and the hot water pipe (420), one end of the hot water pipe (420) is connected with the water outlet side (120) of the water heater (100), the other end is connected with the hot water end (212) of the water consumption point (200), one end of the cold water pipe (410) is used for connecting a water source, the other end of the cold water pipe is divided into a first branch (411) and a second branch (412), the first branch (411) is connected with the water inlet side (110) of the water heater (100), the second branch (412) is connected with the cold water end (211) of the water using point (200), characterized in that the hot water pipe (420) is also connected with the second branch (412) through a connecting pipeline, and the connecting line is configured to allow a unidirectional flow of water from the hot water pipe (420) to the second branch (412); the water heater (100) further comprises a control device comprising:

a first function building module for obtaining a first functional relationship between a first flow value and a static pressure value of the first branch (411); wherein the first flow value is characterized by the flow value of the first branch (411) when the water heater (100) is at the state that the cold water end (211) of the water consumption point (200) is opened, the hot water end (212) of the water consumption point (200) is closed and the water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree; the static pressure value is characterized by the pressure value of the first branch (411) when the water heater (100) is closed at the water outlet end (213) of the water consumption point (200);

a second function building module for obtaining a second functional relationship between a second flow value and a static pressure value of the first branch (411); wherein the second flow value is characterized by the flow value of the first branch (411) when the water heater (100) is at the state that the hot water end (212) of the water consumption point (200) is opened, the cold water end (211) of the water consumption point (200) is closed and the water outlet end (213) of the water consumption point (200) is opened to the maximum opening degree;

the first calculation module is used for calculating the first flow value corresponding to the actual static pressure value of the first branch (411) according to the first functional relation, and then the first theoretical flow value of the first branch (411) is obtained;

the second calculation module is used for calculating the second flow value corresponding to the actual static pressure value of the first branch (411) according to the second functional relation, and then the second theoretical flow value of the first branch (411) is obtained; and

a control module for judging the starting flow value Q of the water heater (100)_{Starting up}Whether the flow rate is larger than the first theoretical flow rate value and smaller than or equal to the second theoretical flow rate value or not, if not, correcting the starting flow rate value Q of the water heater (100)_{Starting up}Up to the starting flow value Q of the water heater (100)_{Starting up}Greater than the first theoretical flow value and less than or equal to the second theoretical flow value;

9. The water heater according to claim 8, characterized in that a flow gauge (510) for obtaining a flow value of the first branch (411) and a pressure gauge (520) for obtaining a pressure value of the first branch (411) are provided on the first branch (411).

10. The water heater according to claim 8, characterized in that a pressure regulating valve (300) is provided on the second branch (412), the pressure regulating valve (300) being used for regulating the static pressure value of the first branch (411).