CN110953720A - Ultra-small load combustion control method of gas water heater - Google Patents

Abstract

The invention relates to an ultra-small load combustion control method of a gas water heater, wherein the gas water heater comprises a water inlet, a water outlet and a combustion heat exchange system, and is characterized in that: a booster pump, a first three-way valve capable of realizing full opening, a water quantity server and a first flow sensor are added at the water inlet end of the gas water heater, and a second three-way valve capable of realizing full opening and a second flow sensor are added at the water outlet end of the gas water heater; by judging Q_{Computing load}And set Q_{Minimum load}、Q_{Ultimate load}、Q_{Fixed point load}、Q_{Conditional load}The first three-way valve, the water amount servo, the first flow sensor, the second three-way valve and the second flow sensor are controlled according to the relationship between the first three-way valve and the water amount servo. Compared with the prior art, the invention has the advantages that: by the control method provided by the invention, the temperature of the outlet water in summer can be ensured not to be overheated.

Description

Ultra-small load combustion control method of gas water heater

Technical Field

The invention relates to an ultra-small load combustion control method of a gas water heater.

Background

When the existing gas water heater is used in summer, the phenomenon of overheating water temperature can occur, because the water flow rate of a user home is low or when the gas water heater is purchased, the load of a selected machine type is high, and the use of a customer is influenced. The current solution is that after the user receives high-temperature water, the high-temperature water is manually mixed with cold water for use, and the user cannot well experience the constant temperature.

Disclosure of Invention

The invention aims to solve the technical problem of providing an ultra-small load combustion control method of a gas water heater aiming at the prior art, which can ensure that the temperature of outlet water in summer is not overheated.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a super small load burning control method of gas heater, wherein the gas heater includes water inlet, delivery port and burning heat transfer system, its characterized in that: the method comprises the following steps that a booster pump, a first three-way valve capable of realizing full opening, a water quantity server and a first flow sensor are added at the water inlet end of a gas water heater, and a second three-way valve capable of realizing full opening and a second flow sensor are added at the water outlet end of the gas water heater, wherein the inlet of the booster pump is communicated with the water inlet of the gas water heater, the outlet of the booster pump is communicated with the first port of the first three-way valve, the second port of the first three-way valve is communicated with the inlet of the water quantity server, and the outlet of the water quantity server is communicated with a cold water inlet of a combustion heat exchange system of the gas water heater; a first port of the second three-way valve is communicated with a hot water outlet of the combustion heat exchange system, a second port of the second three-way valve is communicated with a water outlet of the gas water heater after being connected with the second flow sensor, and a third port of the second three-way valve is communicated with a third port of the first three-way valve; under a normal state, a first port of the first three-way valve is opened, a second port of the first three-way valve is opened, and a third port of the first three-way valve is closed; the ultra-small load combustion control method of the gas water heater comprises the following steps:

step 1, introducing an initialization condition, and starting combustion monitoring;

step 2, judging Q_{Computing load}≤Q_{Minimum load}If yes, entering step 3; if not, the gas water heater enters normal combustion parameters for combustion controlAnd (5) returning to the step (2) at the same time; wherein Q_{Computing load}Calculating the current heat load according to the initialization condition; q_{Minimum load}The minimum combustion load of the gas water heater is a fixed value, and the gas water heater is calibrated when leaving a factory;

step 3, judging continuous t seconds Q_{Computing load}≤Q_{Minimum load}If satisfied, Q_{Computing load}≤Q_{Minimum load}The duration is more than or equal to t seconds, and the step 4 is carried out; if not, i.e. Q_{Computing load}≤Q_{Minimum load}If the duration is less than t seconds, the gas water heater enters normal combustion parameters for combustion control, and the step 2 is returned; t is 8-15;

step 4, judging continuous t seconds Q_{Computing load}≤Q_{Ultimate load}If satisfied, Q_{Computing load}≤Q_{Ultimate load}The duration is more than or equal to t seconds, and the sub-process 1 is entered; if not, i.e. Q_{Computing load}≤Q_{Ultimate load}If the duration is less than t seconds, entering step 5; q_{Ultimate load}Is a predetermined constant, Q_{Ultimate load}Is less than Q_{Minimum load}；

Step 5, judging continuous t seconds Q_{Computing load}≤Q_{Fixed point load}If satisfied, Q_{Computing load}≤Q_{Fixed point load}The duration is more than or equal to t seconds, and the sub-process 2 is entered; if not, i.e. Q_{Computing load}≤Q_{Fixed point load}If the duration is less than t seconds, entering step 6; q_{Fixed point load}Is a predetermined constant, Q_{Fixed point load}Is less than Q_{Minimum load}Is greater than Q_{Ultimate load}；

Step 6, judging continuous t seconds Q_{Computing load}≤Q_{Conditional load}If satisfied, Q_{Computing load}≤Q_{Conditional load}The duration is more than or equal to t seconds, and the sub-process 3 is entered; if not, i.e. Q_{Computing load}≤Q_{Conditional load}The duration is less than t seconds, and the step is returned1；Q_{Conditional load}Is a predetermined constant, Q_{Conditional load}Is greater than Q_{Minimum load}；

The sub-process 1 specifically comprises:

step 1-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L is more than or equal to L, the value of L is 2L/min to 3L/min, if L is not less than L_{Water (W)}Entering a sub-process 2 if L is more than or equal to L_{Water (W)}<L, entering the step 1-2;

step 1-2, starting a booster pump, and executing step 1-3;

step 1-3, judging water inlet flow L 'of the gas water heater after the booster pump is started'_{Water (W)}Whether or not is greater than or equal to L, if L'_{Water (W)}Entering a subflow 2 if L is more than or equal to L'_{Water (W)}<L, the gas water heater cannot be started to burn;

the sub-process 2 specifically comprises:

step 2-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether or not it is greater than or equal to L, if L is_{Water (W)}Entering the step 2-2 when the volume is more than or equal to L; if L is_{Water (W)}<L, entering a sub-process 1;

step 2-2, calculating the time matching parameter k of combustion of corresponding load, wherein

k＝(2×Q_{Computing load})/(Q_{Minimum load}+Q_{Load of fire protection}) Then entering step 2-3; q_{Load of fire protection}Minimum thermal load, Q, set without extinguishing when ensuring combustion of gas water heater_{Load of fire protection}Is a predetermined constant, Q_{Load of fire protection}Is less than Q_{Ultimate load}；

Step 2-3, judging whether k is more than or equal to 1, if k is more than or equal to 1, firstly, the heat load of the gas water heater is according to Q_{Minimum load}Combustion is carried out for a duration of 2 seconds and then according to Q_{Load of fire protection}Performing combustion for 2k seconds, and then returning to the step 2; if k is<1, heat load of gas water heater according to Q_{Minimum load}Combustion is carried out for a duration of 2k seconds and then according to Q_{Load of fire protection}Performing combustion for 2 seconds, and then returning to the step 2;

the sub-process 3 specifically comprises:

step 3-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L ' is more than or equal to L ' or not, the value of L ' is 3L/min to 5L/min, if L is not less than L_{Water (W)}Not less than L', entering the step 3-2; if L is_{Water (W)}<L', entering a sub-process 2;

step 3-2, calculating a water flow matching parameter k', wherein k ═ Q_{Minimum load}-Q_{Computing load})/Q_{Minimum load}Entering step 3-3;

3-3, adjusting the first three-way valve and the second three-way valve to fully open three ports of the first three-way valve and the second three-way valve, and adjusting the water quantity servo to enable the water flow L flowing through the first water flow sensor_{Water 1}And flows through the second water flow sensor L_{Water 2}Is a linear function of the relationship of, L_{Water 1}＝k’×L_{Water 2}And then returns to step 2.

Compared with the prior art, the invention has the advantages that: by the control method provided by the invention, the temperature of the outlet water in summer can be ensured not to be overheated.

Drawings

Fig. 1 is a schematic structural diagram of a gas water heater in an embodiment of the invention.

Fig. 2 is a main flow chart of a control method for ultra-small load combustion of a gas water heater in the embodiment of the invention.

FIG. 3 is a flow chart of sub-process 1 in the embodiment of the present invention.

FIG. 4 is a flow chart of sub-process 2 in the embodiment of the present invention.

FIG. 5 is a flow chart of sub-process 3 in the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The invention provides a method for controlling ultra-small load combustion of a gas water heater, which is suitable for the gas water heater with a water inlet 1, a water outlet 2 and a combustion heat exchange system 3, wherein a booster pump 4, a first three-way valve 5, a water quantity servo 6 and a first flow sensor 7 which can realize full opening are added at the water inlet end of the gas water heater, a second three-way valve 8 and a second flow sensor 9 which can realize full opening are added at the water outlet end of the gas water heater, the inlet of the booster pump 4 is communicated with the water inlet 1 of the gas water heater, the outlet of the booster pump 4 is communicated with a first port of the first three-way valve 5, a second port of the first three-way valve 5 is communicated with the inlet of the water quantity servo 6, and the outlet of the water quantity servo 6 is communicated with a cold water inlet of the combustion heat exchange system 3; a first port of the second three-way valve 8 is communicated with a hot water outlet of the combustion heat exchange system 3, a second port of the second three-way valve 8 is communicated with a water outlet 2 of the gas water heater after being connected with a second flow sensor 9, and a third port of the second three-way valve 8 is communicated with a third port of the first three-way valve 5; under a normal state, a first port of the first three-way valve is opened, a second port of the first three-way valve is opened, and a third port of the first three-way valve is closed; as shown in fig. 1.

The ultra-small load combustion control method of the gas water heater comprises the following steps, as shown in figure 2:

step 1, introducing an initialization condition, and starting combustion monitoring;

step 2, judging Q_{Computing load}≤Q_{Minimum load}If yes, entering step 3; if not, the gas water heater enters normal combustion parameters for combustion control, and meanwhile, the step 2 is returned, and the Q is monitored in real time_{Computing load}≤ Q_{Minimum load}(ii) a Wherein Q_{Computing load}Calculating according to the initialization condition to obtain the current heat load demand, wherein the combustion load calculation formula is as follows: load is temperature difference and water flow is 10, wherein the temperature difference is the difference between the inlet water temperature and the outlet water temperature; q_{Minimum load}The minimum combustion load of the gas water heater is a fixed value and is a calculation formula according to the combustion load: load temperature difference and water flow 10; q_{Minimum load}Taking 85 as a general rule;

step 3, judging continuous t seconds Q_{Computing load}≤Q_{Minimum load}If satisfied, Q_{Computing load}≤Q_{Minimum load}Duration of greater than or equal toAt t seconds, entering step 4; if not, i.e. Q_{Computing load}≤Q_{Minimum load}When the duration is less than t seconds, the gas water heater enters normal combustion parameters for combustion control, and meanwhile, the step 2 is returned, and the Q is monitored in real time_{Computing load}≤Q_{Minimum load}(ii) a the value of t is 8-15, the value of 10 in the embodiment is too short, the control flow is cut off, the experience of customers is affected due to too long time, and the value of 10s is better;

step 4, judging continuous t seconds Q_{Computing load}≤Q_{Ultimate load}If satisfied, Q_{Computing load}≤Q_{Ultimate load}The duration is more than or equal to t seconds, and the sub-process 1 is entered; if not, i.e. Q_{Computing load}≤Q_{Ultimate load}If the duration is less than t seconds, entering step 5; q_{Ultimate load}Is a predetermined constant, Q_{Ultimate load}Is less than Q_{Minimum load}(ii) a According to the load calculation formula, Q in this embodiment_{Ultimate load}Is 60;

step 5, judging continuous t seconds Q_{Computing load}≤Q_{Fixed point load}If satisfied, Q_{Computing load}≤Q_{Fixed point load}The duration is more than or equal to t seconds, and the sub-process 2 is entered; if not, i.e. Q_{Computing load}≤Q_{Fixed point load}If the duration is less than t seconds, entering step 6; q_{Fixed point load}Is a predetermined constant, Q_{Fixed point load}Is less than Q_{Minimum load}Is greater than Q_{Ultimate load}According to the load calculation formula, Q in this embodiment_{Fixed point load}Is 75; 75 is calculated by the load temperature difference water flow 10; the minimum starting water flow is 2.5L/min, the combustion is not started at the temperature difference of 2 ℃, and 3 x 2.5 x 10 is 75 when the temperature difference is 3 ℃;

step 6, judging continuous t seconds Q_{Computing load}≤Q_{Conditional load}If satisfied, Q_{Computing load}≤Q_{Conditional load}The duration is more than or equal to t seconds, and the sub-process 3 is entered; if not, i.e. Q_{Computing load}≤Q_{Conditional load}PersistenceIf the time is less than t seconds, returning to the step 1; q_{Conditional load}Is a predetermined constant, Q_{Conditional load}Is greater than Q_{Minimum load}(ii) a In this example Q_{Conditional load}Is 120;

the sub-process 1 specifically includes, as shown in fig. 3:

step 1-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L is more than or equal to L or not, wherein the value of L is 2L/min-3L/min, in the embodiment, L is 2.5L/min, and if L is more than or equal to L, L is not less than 2.5L/min_{Water (W)}Entering a sub-process 2 if L is more than or equal to L_{Water (W)}<L, entering the step 1-2;

step 1-2, starting a booster pump, and executing step 1-3;

step 1-3, judging water inlet flow L 'of the gas water heater after the booster pump is started'_{Water (W)}Whether or not is greater than or equal to L, if L'_{Water (W)}Entering a subflow 2 if L is more than or equal to L'_{Water (W)}<L, the gas water heater cannot be started to burn;

the sub-process 2 specifically includes, as shown in fig. 4:

step 2-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether or not it is greater than or equal to L, if L is_{Water (W)}Entering the step 2-2 when the volume is more than or equal to L; if L is_{Water (W)}<L, entering a sub-process 1;

step 2-2, calculating the time matching parameter k of combustion of corresponding load, wherein

k＝(2×Q_{Computing load})/(Q_{Minimum load}+Q_{Load of fire protection}) Then entering step 2-3; q_{Load of fire protection}Minimum thermal load, Q, set without extinguishing when ensuring combustion of gas water heater_{Load of fire protection}Is a constant value;

step 2-3, judging whether k is more than or equal to 1, if k is more than or equal to 1, firstly, the heat load of the gas water heater is according to Q_{Minimum load}Combustion is carried out for a duration of 2 seconds and then according to Q_{Load of fire protection}Performing combustion for 2k seconds, and then returning to the step 2; if k is<1, heat load of gas water heater according to Q_{Minimum load}Combustion is carried out for a duration of 2k seconds and then according to Q_{Load of fire protection}Combustion was performed for 2 seconds, and thenReturning to the step 2;

the sub-process 3 specifically includes, as shown in fig. 5:

step 3-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L 'is more than or equal to L' or not, wherein the L 'is 3L/min-5L/min, in the embodiment, the L' is 4L/min, and if the L is more than or equal to L ', the L' is not less than 3L/min_{Water (W)}Not less than L', entering the step 3-2; if L is_{Water (W)}<L', entering a sub-process 2;

step 3-2, calculating a water flow matching parameter k', wherein k ═ Q_{Minimum load}-Q_{Computing load})/Q_{Minimum load}Entering step 3-3;

3-3, adjusting the first three-way valve and the second three-way valve to fully open three ports of the first three-way valve and the second three-way valve, and adjusting the water quantity servo to enable the water flow L flowing through the first water flow sensor_{Water 1}And flows through the second water flow sensor L_{Water 2}Is a linear function of the relationship of, L_{Water 1}＝k’×L_{Water 2}And then returns to step 2.

Claims (1)

1. The utility model provides a super small load burning control method of gas heater, wherein the gas heater includes water inlet, delivery port and burning heat transfer system, its characterized in that: the method comprises the following steps that a booster pump, a first three-way valve capable of realizing full opening, a water quantity server and a first flow sensor are added at the water inlet end of a gas water heater, and a second three-way valve capable of realizing full opening and a second flow sensor are added at the water outlet end of the gas water heater, wherein the inlet of the booster pump is communicated with the water inlet of the gas water heater, the outlet of the booster pump is communicated with the first port of the first three-way valve, the second port of the first three-way valve is communicated with the inlet of the water quantity server, and the outlet of the water quantity server is communicated with a cold water inlet of a combustion heat exchange system of the gas water heater; a first port of the second three-way valve is communicated with a hot water outlet of the combustion heat exchange system, a second port of the second three-way valve is communicated with a water outlet of the gas water heater after being connected with the second flow sensor, and a third port of the second three-way valve is communicated with a third port of the first three-way valve; under a normal state, a first port of the first three-way valve is opened, a second port of the first three-way valve is opened, and a third port of the first three-way valve is closed; the ultra-small load combustion control method of the gas water heater comprises the following steps:

step 1, introducing an initialization condition, and starting combustion monitoring;

step 2, judging Q_{Computing load}≤Q_{Minimum load}If yes, entering step 3; if not, the gas water heater enters normal combustion parameters for combustion control, and meanwhile, the step 2 is returned; wherein Q_{Computing load}Calculating the current heat load according to the initialization condition; q_{Minimum load}The minimum combustion load of the gas water heater is a fixed value, and the gas water heater is calibrated when leaving a factory;

step 3, judging continuous t seconds Q_{Computing load}≤Q_{Minimum load}If satisfied, Q_{Computing load}≤Q_{Minimum load}The duration is more than or equal to t seconds, and the step 4 is carried out; if not, i.e. Q_{Computing load}≤Q_{Minimum load}If the duration is less than t seconds, the gas water heater enters normal combustion parameters for combustion control, and the step 2 is returned; t is 8-15;

step 4, judging continuous t seconds Q_{Computing load}≤Q_{Ultimate load}If satisfied, Q_{Computing load}≤Q_{Ultimate load}The duration is more than or equal to t seconds, and the sub-process 1 is entered; if not, i.e. Q_{Computing load}≤Q_{Ultimate load}If the duration is less than t seconds, entering step 5; q_{Ultimate load}Is a predetermined constant, Q_{Ultimate load}Is less than Q_{Minimum load}；

Step 5, judging continuous t seconds Q_{Computing load}≤Q_{Fixed point load}If satisfied, Q_{Computing load}≤Q_{Fixed point load}The duration is more than or equal to t seconds, and the sub-process 2 is entered; if not, i.e. Q_{Computing load}≤Q_{Fixed point load}If the duration is less than t seconds, entering step 6; q_{Fixed point load}Is a predetermined constant, Q_{Fixed point load}Is less than Q_{Minimum load}Is greater than Q_{Ultimate load}；

Step 6, judging continuous t seconds Q_{Computing load}≤Q_{Conditional load}If satisfied, Q_{Computing load}≤Q_{Conditional load}The duration is more than or equal to t seconds, and the sub-process 3 is entered; if not, i.e. Q_{Computing load}≤Q_{Conditional load}The duration is less than t seconds, and the step 1 is returned; q_{Conditional load}Is a predetermined constant, Q_{Conditional load}Is greater than Q_{Minimum load}；

The sub-process 1 specifically comprises:

step 1-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L is more than or equal to L, the value of L is 2L/min to 3L/min, if L is not less than L_{Water (W)}Entering a sub-process 2 if L is more than or equal to L_{Water (W)}<L, entering the step 1-2;

step 1-2, starting a booster pump, and executing step 1-3;

step 1-3, judging water inlet flow L 'of the gas water heater after the booster pump is started'_{Water (W)}Whether or not is greater than or equal to L, if L'_{Water (W)}Entering a subflow 2 if L is more than or equal to L'_{Water (W)}<L, the gas water heater cannot be started to burn;

the sub-process 2 specifically comprises:

step 2-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether or not it is greater than or equal to L, if L is_{Water (W)}Entering the step 2-2 when the volume is more than or equal to L; if L is_{Water (W)}<L, entering a sub-process 1;

step 2-2, calculating the time matching parameter k of combustion of corresponding load, wherein

k＝(2×Q_{Computing load})/(Q_{Minimum load}+Q_{Load of fire protection}) Then entering step 2-3; q_{Load of fire protection}Minimum thermal load, Q, set without extinguishing when ensuring combustion of gas water heater_{Load of fire protection}Is a predetermined constant, Q_{Load of fire protection}Is less than Q_{Ultimate load}；

2-3, judging whether k is more than or equal to 1, and if k is more than or equal to 1, burning the gasThe heat load of the water heater is firstly according to Q_{Minimum load}Combustion is carried out for a duration of 2 seconds and then according to Q_{Load of fire protection}Performing combustion for 2k seconds, and then returning to the step 2; if k is<1, heat load of gas water heater according to Q_{Minimum load}Combustion is carried out for a duration of 2k seconds and then according to Q_{Load of fire protection}Performing combustion for 2 seconds, and then returning to the step 2;

the sub-process 3 specifically comprises:

step 3-1, judging the water inlet flow L of the gas water heater_{Water (W)}Whether the L ' is more than or equal to L ' or not, the value of L ' is 3L/min to 5L/min, if L is not less than L_{Water (W)}Not less than L', entering the step 3-2; if L is_{Water (W)}<L', entering a sub-process 2;

step 3-2, calculating a water flow matching parameter k', wherein k ═ Q_{Minimum load}-Q_{Computing load})/Q_{Minimum load}Entering step 3-3;

3-3, adjusting the first three-way valve and the second three-way valve to fully open three ports of the first three-way valve and the second three-way valve, and adjusting the water quantity servo to enable the water flow L flowing through the first water flow sensor_{Water 1}And flows through the second water flow sensor L_{Water 2}Is a linear function of the relationship of, L_{Water 1}＝k’×L_{Water 2}And then returns to step 2.

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