A fan rotating speed adjusting method and a fan rotating speed adjusting device

Abstract

The application discloses a fan rotating speed adjusting method and a fan rotating speed adjusting device. The fan rotating speed adjusting method comprises the following steps: S1, selecting a load to be detected; S2, adjusting the opening degree of a gas valve and the water inflow of a gas water heater according to the load to be detected; S3, adjusting the flue gas exhaust state of the gas water heater to a long flue pipe state; S4, the gas water heater enters a combustion mode, the rotating speed of the fan of the gas water heater is adjusted, and the rotating speed of the fan is adjusted according to the rotating speed corresponding to the load in advance; S5, judging the CO concentration N at the flue pipe of the gas water heater, judging whether the CO concentration N is higher than a first preset value S1, if yes, the rotating speed of the fan is increased and the step S5 is repeatedly executed, and if no, the step S6 is entered; S6, judging whether the CO concentration N is lower than a second preset value S2, if yes, the rotating speed of the fan is reduced and the step S6 is repeatedly executed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a fan rotating speed adjusting method and a fan rotating speed adjusting device. BACKGROUND

[0002] The CO concentration discharged by the gas water heater during operation needs to meet the national standard. The existing gas water heater generally adjusts the rotating speed of the fan to make the discharged CO concentration within the set range value, but cannot adjust the rotating speed of the fan under different loads for each gas water heater, resulting in that the control of the rotating speed of the fan of the gas water heater is not accurate enough, and there is a large error in practice.

[0003] Therefore, a fan rotating speed adjusting method is needed to solve the above problems. SUMMARY

[0004] The present application aims to at least solve one of the problems existing in the prior art, and for this purpose, the present application provides a fan rotating speed adjusting method, which can adjust the rotating speed of the corresponding fan under different loads of the gas water heater, thereby ensuring that the CO concentration N discharged by the exhaust pipe of the gas water heater under different loads can meet the standard.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] A fan rotating speed adjusting method, comprising the following steps:

[0007] S1: selecting a load to be detected;

[0008] S2: adjusting the opening degree of the gas valve and the water inflow of the gas water heater according to the load to be detected;

[0009] S3: adjusting the flue gas exhaust state of the gas water heater to a long flue pipe state;

[0010] S4: the gas water heater enters a combustion mode, and the rotating speed of the fan of the gas water heater is adjusted, and the rotating speed of the fan is operated according to the pre-set rotating speed corresponding to the load;

[0011] S5: detecting the CO concentration N at the outlet of the exhaust pipe of the gas water heater, and determining whether the CO concentration N is higher than a first preset value S1, if yes, the rotating speed of the fan is increased and S5 is repeatedly executed, if no, S6 is entered;

[0012] S6: determining whether the CO concentration N is lower than a second preset value S2, if yes, the rotating speed of the fan is reduced and S6 is repeatedly executed, if no, S7 is entered;

[0013] S7: adjusting the flue gas exhaust state of the gas water heater to a short flue pipe state;

[0014] S8: judging whether the CO concentration N is between the third preset value S3 and the fourth preset value S4, if yes, the fan speed adjustment operation of the gas water heater is completed, if not, an error alarm is issued.

[0015] Optionally, the specific steps of S3 include: installing the shielding device on the exhaust pipe, and shielding part of the exhaust holes of the exhaust pipe by the shielding device, and the specific steps of S7 include: the shielding device opening all the exhaust holes of the exhaust pipe.

[0016] Optionally, in S2, adjusting the opening of the gas valve of the gas water heater according to the detected load in need specifically includes the following steps:

[0017] When the detected load is 2 fire, both the first electromagnetic valve and the second electromagnetic valve in the gas valve of the gas water heater are closed;

[0018] When the detected load is 4 fire, the first electromagnetic valve is opened and the second electromagnetic valve is closed;

[0019] When the detected load is 6 fire, both the first electromagnetic valve and the second electromagnetic valve are opened.

[0020] Optionally, in S2, adjusting the water flow of the gas valve of the gas water heater according to the detected load in need specifically includes the following steps:

[0021] Installing a water flow adjusting device 2 at the water inlet pipe of the gas water heater;

[0022] When the detected load is the minimum load 2PL of 2 fire, the minimum load 4PL of 4 fire and the minimum load 6PL of 6 fire, the water flow adjusting device 2 is adjusted to adjust the water flow into the gas water heater to 5L / MIN;

[0023] When the detected load is the maximum load 2PH of 2 fire, the maximum load 4PH of 4 fire and the maximum load 6PH of 6 fire, the water flow adjusting device 2 is adjusted to adjust the water flow into the gas water heater to 10L / MIN.

[0024] Optionally, in S4, the combustion mode is operated for a preset time T, and after the value of the CO concentration N and the speed of the fan are stable, S5 is executed.

[0025] Optionally, in S4, adjusting the speed of the fan of the gas water heater specifically includes the following steps: adjusting the speed of the fan by controlling the voltage PWM duty cycle of the fan.

[0026] Optionally, when the detected load is the minimum load 2PL of 2 rows of fires, the minimum load 4PL of 4 rows of fires and the minimum load 6PL of 6 rows of fires, the first preset value S1 is 0.04%+0.004%, the second preset value S2 is 0.04%-0.004%, the third preset value S3 is 0.03%+0.006%, and the fourth preset value is 0.03%-0.006%;

[0027] When the detected load is the maximum load 2PH of 2 rows of fires, the maximum load 4PH of 4 rows of fires and the maximum load 6PH of 6 rows of fires, the first preset value S1 is 0.05%+0.005%, the second preset value S2 is 0.05%-0.005%, the third preset value S3 is 0.04%+0.008%, and the fourth preset value is 0.04%-0.008%.

[0028] Optionally, when adjusting the rotating speed of the fan, the adjustment value is 50r / min each time.

[0029] Another aspect of the present application provides a fan rotating speed adjusting device, which adjusts the rotating speed of the fan of the gas water heater by using the above-mentioned fan rotating speed adjusting method.

[0030] Optionally, the fan rotating speed adjusting device comprises:

[0031] a controller;

[0032] a CO concentration detecting device arranged at the outlet of the smoke exhaust pipe and used for detecting the CO concentration of the smoke exhaust pipe;

[0033] a shielding device in communication connection with the controller and installed on the smoke exhaust pipe, and used for shielding part of the smoke exhaust holes of the smoke exhaust pipe and opening all the smoke exhaust holes of the smoke exhaust pipe;

[0034] a water flow adjusting device 2 in communication connection with the controller and installed at the water inlet pipe of the gas water heater.

[0035] Optionally, the shielding device comprises:

[0036] a driving motor;

[0037] a smoke blocking cover sleeved on the smoke exhaust pipe and in transmission connection with the driving motor, and the driving motor can drive the smoke blocking cover to slide on the smoke exhaust pipe to block part of the smoke exhaust holes or open all the smoke exhaust holes.

[0038] Compared with the prior art, the present application has at least the following beneficial effects:

[0039] The fan rotating speed adjusting method can adjust the rotating speed of the corresponding fan according to the different loads of the gas water heater, so that the CO concentration N discharged by the exhaust pipe of the gas water heater can reach the standard in the operation of different loads. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a power broken line diagram of the gas water heater provided by the embodiment of the present application;

[0041] Figure 2 is an assembly schematic diagram of the fan rotating speed adjusting device when adjusting the rotating speed of the fan of the gas water heater.

[0042] In the drawings:

[0043] 1, casing; 11, heat exchanger; 12, control unit; 13, water inlet pipe; 14, driving motor; 15, exhaust pipe; 16, exhaust hole; 17, hot water outlet

[0044] 2, water flow adjusting device 2;

[0045] 3, controller;

[0046] 41, driving motor; 42, smoke blocking cover;

[0047] 5, CO concentration detection device. DETAILED DESCRIPTION

[0048] The following embodiments are used to illustrate the present application, but the present application is not limited by these embodiments. The specific embodiments of the present application are modified or some technical features are replaced equivalently without departing from the spirit of the present application, which should be covered in the technical solution range of the present application.

[0049] Please refer to Figure 1 The existing gas water heater has different loads, and the gas water heater with different power has different segmentation modes, for example, 2-4-6 segmented gas water heater, which means that the gas water heater can use 2 rows of fire, 4 rows of fire or 6 rows of fire to burn and heat, and different rows are used for burning and heating according to the different loads selected by the user.

[0050] Please refer to Figure 2 The present application provides a fan rotating speed adjusting method, comprising the following steps:

[0051] S1: selecting the load to be detected;

[0052] S2: adjusting the opening degree of the gas valve and the water inlet flow of the gas water heater according to the load to be detected;

[0053] S3: adjust the flue gas exhaust state of the gas water heater to the long flue pipe state;

[0054] S4: the gas water heater enters the combustion mode, and the rotating speed of the fan of the gas water heater is adjusted, and the rotating speed of the fan is operated according to the rotating speed corresponding to the load which is preset;

[0055] S5: the CO concentration N at the outlet of the flue gas exhaust pipe 15 of the gas water heater is detected, and it is judged whether the CO concentration N is higher than the first preset value S1, if yes, the rotating speed of the fan is increased, and S5 is repeatedly executed, if no, S6 is entered;

[0056] S6: it is judged whether the CO concentration N is lower than the second preset value S2, if yes, the rotating speed of the fan is reduced, and S6 is repeatedly executed, if no, S7 is entered;

[0057] S7: the flue gas exhaust state of the gas water heater is adjusted to the short flue pipe state;

[0058] S8: it is judged whether the CO concentration N is between the third preset value S3 and the fourth preset value S4, if yes, the rotating speed adjustment operation of the fan of the gas water heater is completed, if no, an error alarm is sent.

[0059] The fan rotating speed adjustment method provided by the application can adjust the rotating speed of the corresponding fan according to the different loads of the gas water heater, so that the CO concentration N discharged by the flue gas exhaust pipe 15 of the gas water heater can meet the standard in the operation of the gas water heater under different loads.

[0060] In S4, the rotating speed of the fan is operated according to the rotating speed corresponding to the load which is preset, specifically, the rotating speed of the fan and the data corresponding to the CO concentration N under the long flue pipe and the short flue pipe state and the load are shown in Table 1 as follows:

[0061] Table 1

[0062] Row Load KW Speed r / min Short smoke pipe CO concentration N (error ± 20%) Long smoke pipe CO concentration N (error ± 10%) 2 rows PL 3 1800-2200 0.03% 0.04% 2 rows PH 7 2400-2600 0.04% 0.05% 4 rows PL 6 1900-2300 0.03% 0.04% 4 rows PH 13 2600-2800 0.04% 0.05% 6 rows PL 10 2000-2400 0.03% 0.04% 6 rows PH 23 2800-3000 0.04% 0.05%

[0063] The national standard value of the CO concentration N is less than 0.06%, and the set value of the CO concentration N of a general gas water heater is shown in Table 1, which is less than the national standard value. Since the fan speed set according to Table 1 in the prior art has a certain error, the CO concentration N cannot be more accurately controlled, therefore, the fan speed of the gas water heater under all load conditions is more accurately adjusted, so that the control of the CO concentration N is more accurate. It should be noted that the long flue pipe state in the present application refers to the gas water heater using a long flue pipe 15 (three meters long with three bends) for smoke exhaust, and the short flue pipe state refers to the gas water heater using a short flue pipe 15 (one meter long with one bend) for smoke exhaust. When the fan is at the same speed, the flue pipe 15 is longer in the long flue pipe state, and the smoothness of smoke exhaust is poorer, so the CO concentration N is higher than that in the short flue pipe state, therefore, in Table 1, the value of the CO concentration N needs to be ensured to be lower than the national standard value in the long flue pipe state.

[0064] Optionally, the specific steps of S3 include: installing a shielding device on the flue pipe 15, shielding part of the smoke exhaust holes 16 of the flue pipe 15 through the shielding device, so as to reduce the smoothness of smoke exhaust, and then simulate the long flue pipe state, and the specific steps of S7 include: opening all the smoke exhaust holes 16 of the flue pipe 15 through the shielding device to ensure the smoothness of smoke exhaust, and then simulate the short flue pipe state.

[0065] Optionally, in S2, adjusting the opening degree of the gas valve of the gas water heater according to the detected load specifically includes the following steps:

[0066] When the detected load is 2 fires, the first electromagnetic valve and the second electromagnetic valve in the gas valve of the gas water heater are both closed to adjust the gas delivery amount to the lowest. When the detected load is 4 fires, the first electromagnetic valve is opened and the second electromagnetic valve is closed to increase the gas delivery amount. When the detected load is 6 fires, the first electromagnetic valve and the second electromagnetic valve are both opened to adjust the gas delivery amount to the highest.

[0067] Optionally, in S2, adjusting the water inflow of the gas valve of the gas water heater according to the detected load specifically includes the following steps:

[0068] The water flow regulating device 2 is installed at the water inlet pipe 13 of the gas water heater. When the detected load is the minimum load 2PL of 2 fires, the minimum load 4PL of 4 fires and the minimum load 6PL of 6 fires, the water flow is regulated to a lower water flow by regulating the water flow into the gas water heater to 5L / MIN at the water flow regulating device 2 to simulate the state of regulating the water flow to a lower water flow when used by a user. When the detected load is the maximum load 2PH of 2 fires, the maximum load 4PH of 4 fires and the maximum load 6PH of 6 fires, the water flow is regulated to a higher water flow by regulating the water flow into the gas water heater to 10L / MIN at the water flow regulating device 2 to simulate the state of regulating the water flow to a higher water flow when used by a user.

[0069] Optionally, in S4, the combustion mode is operated for a preset time T, and when the value of the CO concentration N and the rotating speed of the fan are stabilized, S5 is executed, so as to ensure the accuracy of the CO concentration N.

[0070] Optionally, in S4, the step of regulating the rotating speed of the fan of the gas water heater comprises the following steps: regulating the rotating speed of the fan by controlling the voltage PWM duty cycle of the fan. Specifically, the rotating speed of the fan is regulated according to the data of the rotating speed of the fan corresponding to the voltage PWM duty cycle shown in Table Two below:

[0071] Table Two

[0072] Voltage PWM duty ratio of control fan Speed r / min (there is about 10% error) 0% 0 10% 400 20% 800 30% 1200 40% 1600 50% 2000 60% 2400 70% 2800 80% 3200 90% 3600 100% 4000

[0073] Optionally, when the detected load is the minimum load 2PL of 2 fires, the minimum load 4PL of 4 fires and the minimum load 6PL of 6 fires, the first preset value S1 is 0.04%+0.004%, the second preset value S2 is 0.04%-0.004%, the third preset value S3 is 0.03%+0.006%, and the fourth preset value is 0.03%-0.006%. When the detected load is the maximum load 2PH of 2 fires, the maximum load 4PH of 4 fires and the maximum load 6PH of 6 fires, the first preset value S1 is 0.05%+0.005%, the second preset value S2 is 0.05%-0.005%, the third preset value S3 is 0.04%+0.008%, and the fourth preset value is 0.04%-0.008%.

[0074] Optionally, when regulating the rotating speed of the fan, the adjustment value is 50r / min each time.

[0075] Specifically, the step of regulating the rotating speed of the fan of the gas water heater under no load is as follows:

[0076] S100: regulating the rotating speed of the fan when the load is the minimum load 2PL of 2 fires;

[0077] S200: Adjust the speed of the fan when the minimum fire of 4 rows of fire is 4PL;

[0078] S300: Adjust the speed of the fan when the minimum fire of 6 rows of fire is 6PL;

[0079] S400: Adjust the speed of the fan when the maximum fire of 2 rows of fire is 2PH;

[0080] S500: Adjust the speed of the fan when the maximum fire of 4 rows of fire is 4PH;

[0081] S600: Adjust the speed of the fan when the minimum fire of 6 rows of fire is 6PH.

[0082] S100 specifically comprises the following steps:

[0083] S101: Open the gas valve, and close the first electromagnetic valve and the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long smoke pipe state;

[0084] S102: The water flow adjusting device 2 adjusts the water flow to 5L / min;

[0085] S103: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter the minimum load 2PL of 2 rows of fire, at this time the fan runs at a preset speed of 2000r / min, and the corresponding voltage PWM proportion of the fan is empty 50%;

[0086] S104: The combustion mode runs for a preset time (10s), which ensures that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, and when the CO concentration value N does not change, it means that the combustion has basically stabilized;

[0087] S105: When N>0.04%+0.004%, it means that the CO concentration N is high at this time, then the speed of the fan is increased by 50r / min, and the corresponding voltage PWM proportion of the fan is increased to 1.25%, and then returns to S104. When N<0.04%-0.004%, it means that the CO concentration N is low at this time, then the speed of the fan is reduced by 50r / min, and the corresponding voltage PWM proportion of the fan is reduced to 1.25%, and then returns to S104. When 0.04%+0.004%≥N≥0.04%-0.004%, it means that the CO concentration N is qualified at this time, then enter S106;

[0088] S106: The shielding device adjusts the smoke exhaust state to the short smoke pipe state;

[0089] S107: The combustion mode runs for a preset time (10s), ensuring that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected. When the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0090] S108: Determine whether 0.03%+0.006%≥N≥0.03%-0.006%. If yes, it is considered that the fan speed at 2 rows of minimum fire 2PL is in line with the requirements, and the current fan speed F1 and PWM duty cycle P1 are recorded as the adjusted speed data. If not, an error alarm is issued to notify the test personnel to repair;

[0091] S109: The gas water heater stops burning.

[0092] S200 specifically includes the following steps:

[0093] S201: Open the first electromagnetic valve of the gas valve, close the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long smoke pipe state;

[0094] S202: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter 4 rows of minimum load 4PL. At this time, the fan runs at a preset speed of 2100r / min, and the corresponding fan voltage PWM duty cycle is 52.5%;

[0095] S203: The combustion mode runs for a preset time (10s), ensuring that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected. When the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0096] S204: When N>0.04%+0.004%, it indicates that the CO concentration N is high at this time, then the fan speed is increased by 50r / min, and the corresponding fan voltage PWM duty cycle is increased by 1.25%. Then return to S203. When N<0.04%-0.004%, it indicates that the CO concentration N is low at this time, then the fan speed is decreased by 50r / min, and the corresponding fan voltage PWM duty cycle is decreased by 1.25%. Then return to S203. When 0.04%+0.004%≥N≥0.04%-0.004%, it indicates that the CO concentration N is qualified at this time, then enter S205;

[0097] S205: The shielding device adjusts the smoke exhaust state to the short smoke pipe state;

[0098] S206: The combustion mode runs for a preset time (10s), ensuring that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected. When the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0099] S207: If 0.03%+0.006%≥N≥0.03%-0.006%, it is considered that the speed of the fan at 4 rows of minimum fire 4PH is qualified, and the current speed F2 and PWM duty cycle P2 of the fan are recorded as the adjusted speed data, otherwise, an error alarm is sent to inform the tester to repair;

[0100] S208: The gas water heater stops burning.

[0101] S300 specifically comprises the following steps:

[0102] S301: Open the first electromagnetic valve and the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long flue state;

[0103] S302: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter 6 rows of minimum load 6PL, at this time the fan runs at a preset speed of 2200r / min, and the corresponding fan voltage PWM duty cycle is 55%;

[0104] S303: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected. When the CO concentration value N does not change, it means that the combustion is basically stable.

[0105] S304: When N>0.04%+0.004%, it means that the CO concentration N is high at this time, then the speed of the fan is increased by 50r / min, and the corresponding fan voltage PWM duty cycle is increased by 1.25%, then return to S303. When N<0.04%-0.004%, it means that the CO concentration N is low at this time, then the speed of the fan is reduced by 50r / min, and the corresponding fan voltage PWM duty cycle is reduced by 1.25%, then return to S303. When 0.04%+0.004%≥N≥0.04%-0.004%, it means that the CO concentration N is qualified at this time, then enter S305;

[0106] S305: The shielding device adjusts the smoke exhaust state to the short flue state;

[0107] S306: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected. When the CO concentration value N does not change, it means that the combustion is basically stable.

[0108] S307: Determine whether 0.03%+0.006%≥N≥0.03%-0.006%, if yes, it is considered that the speed of the fan at 6 rows of minimum fire 6PL is in line with the requirements, and the current speed F3 and PWM duty cycle P3 of the fan are recorded as the adjusted speed data, if not, an error alarm is issued to inform the tester to repair;

[0109] S308: The gas water heater stops burning.

[0110] S400 specifically comprises the following steps:

[0111] S401: Close the first electromagnetic valve and the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long flue state;

[0112] S402: The water flow adjusting device 2 adjusts the water flow to 10L / min;

[0113] S403: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter the maximum load 2PH of 2 rows of fire, at this time the fan operates at the preset speed of 2500r / min, and the corresponding voltage PWM duty cycle of the fan is 62.5%;

[0114] S404: The combustion mode runs for a preset time (10s), ensuring that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, when the CO concentration value N does not change, it means that the combustion is basically stable;

[0115] S405: When N>0.05%+0.005%, it means that the CO concentration N is high at this time, then the speed of the fan is increased by 50r / min, and the corresponding voltage PWM duty cycle of the fan is increased by 1.25%, then return to S404. When N<0.05%-0.005%, it means that the CO concentration N is low at this time, then the speed of the fan is decreased by 50r / min, and the corresponding voltage PWM duty cycle of the fan is decreased by 1.25%, then return to S404. When 0.05%+0.005%≥N≥0.05%-0.005%, it means that the CO concentration N is qualified at this time, then enter S406;

[0116] S406: The shielding device adjusts the smoke exhaust state to the short flue state;

[0117] S407: The combustion mode runs for a preset time (10s), ensuring that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, when the CO concentration value N does not change, it means that the combustion is basically stable;

[0118] S408: Determine whether 0.04%+0.008%≥N≥0.04%-0.008%, if yes, it is considered that the speed of the fan at 2PH of the maximum fire of 2 rows of fires meets the requirements, and the current speed F4 and PWM duty cycle P4 of the fan are recorded as the adjusted speed data, if not, an error alarm is issued to inform the tester to repair;

[0119] S409: The gas water heater stops burning.

[0120] S500 specifically comprises the following steps:

[0121] S501: Close the first electromagnetic valve and the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long flue state;

[0122] S502: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter 2PH of the maximum load of 2 rows of fires, at this time the fan operates at a preset speed of 2700r / min, and the corresponding voltage PWM duty cycle of the fan is 67.5%;

[0123] S503: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, when the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0124] S504: When N>0.05%+0.005%, it indicates that the CO concentration N is high at this time, then the speed of the fan is increased by 50r / min, and the corresponding voltage PWM duty cycle of the fan is increased by 1.25%, then return to S503. When N<0.05%-0.005%, it indicates that the CO concentration N is low at this time, then the speed of the fan is decreased by 50r / min, and the corresponding voltage PWM duty cycle of the fan is decreased by 1.25%, then return to S503. When 0.05%+0.005%≥N≥0.05%-0.005%, it indicates that the CO concentration N is qualified at this time, then enter S405;

[0125] S505: The shielding device adjusts the smoke exhaust state to the short flue state;

[0126] S506: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, when the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0127] S507: Determine whether 0.04%+0.008%≥N≥0.04%-0.008%, if yes, it is considered that the speed of the fan at 4 rows of maximum fire 4PH is in line with the requirements, and the current speed F5 and PWM duty cycle P5 of the fan are recorded as the adjusted speed data, if not, an error alarm is issued to inform the tester to repair;

[0128] S508: The gas water heater stops burning.

[0129] S600 specifically comprises the following steps:

[0130] S601: Close the first electromagnetic valve and the second electromagnetic valve of the gas valve, and adjust the smoke exhaust state of the shielding device to the long flue state;

[0131] S602: The gas water heater enters the combustion mode, and after the controller 3 detects that the gas water heater is in a normal combustion state, the control unit 12 of the gas water heater is instructed to adjust the gas water heater to enter 2 rows of maximum load 2PH, at this time the fan operates at a preset speed of 2900r / min, and the corresponding voltage PWM duty cycle of the fan is 72.5%;

[0132] S603: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, and when the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0133] S604: When N>0.05%+0.005%, it indicates that the CO concentration N is high at this time, then the speed of the fan is increased by 50r / min, and the corresponding voltage PWM duty cycle of the fan is increased by 1.25%, and then returns to S603. When N<0.05%-0.005%, it indicates that the CO concentration N is low at this time, then the speed of the fan is reduced by 50r / min, and the corresponding voltage PWM duty cycle of the fan is reduced by 1.25%, and then returns to S603. When 0.05%+0.005%≥N≥0.05%-0.005%, it indicates that the CO concentration N is qualified at this time, then enter S605;

[0134] S605: The shielding device adjusts the smoke exhaust state to the short flue state;

[0135] S606: The combustion mode runs for a preset time (10s) to ensure that the fan speed is stable and the combustion is stable, and the CO concentration value N is collected, and when the CO concentration value N does not change, it indicates that the combustion is basically stable;

[0136] S607: Determine whether 0.04%+0.008%>=N>=0.04%-0.008%, if yes, it is considered that the speed of the fan at 6 rows of maximum fire 6PH is in line with the requirements, and the current speed F6 and PWM duty cycle P6 of the fan are recorded as the adjusted speed data, if not, an error alarm is issued to inform the tester to repair;

[0137] S608: The gas water heater stops burning, and the test is completed.

[0138] After the test is completed, F1, F2, F3, F4, F5, F6 and P1, P2, P3, P4, P5, P6 are stored in the control unit 12 of the gas water heater.

[0139] Another aspect of the present application provides a fan speed adjusting device, which uses the above-mentioned fan speed adjusting method to adjust the fan speed of the gas water heater.

[0140] Please refer to Figure 2 , the gas water heater comprises a shell 1, a heat exchanger 11 mounted on the shell 1, a fan, and a control unit 12, which are all in communication connection with the heat exchanger 11 and the fan.

[0141] Optionally, it comprises a controller 3, a shielding device, a CO concentration detection device, and a water flow adjusting device 2. The shielding device is in communication connection with the controller 3 and is mounted on the smoke exhaust pipe 15, and is used to shield part of the smoke exhaust holes 16 of the smoke exhaust pipe 15 and open all the smoke exhaust holes 16 of the smoke exhaust pipe 15. The CO concentration detection device is arranged at the outlet of the smoke exhaust pipe 15 and is used to detect the CO concentration discharged by the smoke exhaust pipe 15. The water flow adjusting device 2 is in communication connection with the controller 3 and is mounted at the water inlet pipe 13 of the gas water heater.

[0142] Further, the water inlet pipe 13 is connected with the heat exchanger 11, and the shell 1 is also provided with a hot water outlet connected with the heat exchanger 11. The fan is mounted on the upper part of the shell 1 and is connected with the smoke exhaust pipe 15. The control unit 12 is connected with the controller 3, and when the fan speed adjusting device operates, the controller 3 sends instructions to the control unit 12 to control the normal operation of the gas water heater.

[0143] Optionally, the shielding device comprises a driving motor 41 and a smoke blocking cover 42. The smoke blocking cover 42 is sleeved on the smoke exhaust pipe 15 and is in transmission connection with the driving motor 41, and the driving motor 41 can drive the smoke blocking cover 42 to slide on the smoke exhaust pipe 15 to block part of the smoke exhaust holes 16 or open all the smoke exhaust holes 16.

[0144] Optionally, it further comprises a transmission structure, and the transmission motor drives the smoke blocking cover 42 to slide on the smoke exhaust pipe 15 through the transmission structure.

[0145] Exemplarily, in the embodiment, the transmission structure is a rack and pinion structure, and of course, in other embodiments, the transmission structure can also be a screw and nut pair, which is not limited here.

[0146] The above merely illustrates some embodiments of the present application. For those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A method of adjusting the rotational speed of a fan, characterized by, The method comprises the following steps: S1: selecting a load to be detected; S2: adjusting the opening degree of the gas valve and the water inflow of the gas water heater according to the load to be detected; S3: adjusting the flue gas exhaust state of the gas water heater to a long flue state; S4: the gas water heater enters a combustion mode, and the rotating speed of the fan of the gas water heater is adjusted, and the rotating speed of the fan is operated according to the rotating speed corresponding to the load which is preset; S5: detecting the CO concentration N at the outlet of the flue gas exhaust pipe (15) of the gas water heater, and judging whether the CO concentration N is higher than a first preset value S1, if yes, the rotating speed of the fan is increased and S5 is repeatedly executed, if no, S6 is entered; S6: judging whether the CO concentration N is lower than a second preset value S2, if yes, the rotating speed of the fan is decreased and S6 is repeatedly executed, if no, S7 is entered; S7: adjusting the flue gas exhaust state of the gas water heater to a short flue state; S8: judging whether the CO concentration N is between a third preset value S3 and a fourth preset value S4, if yes, the rotating speed adjustment of the fan of the gas water heater is completed, if no, an error alarm is sent out; The length of the flue gas exhaust pipe (15) of the gas water heater is adjusted to the long flue state and the short flue state by the shielding device, and the length of the flue gas exhaust pipe (15) in the long flue state is greater than the length of the flue gas exhaust pipe (15) in the short flue state.

2. The method of claim 1, wherein The specific steps of S3 include: installing the shielding device on the flue gas exhaust pipe (15), and shielding part of the flue gas exhaust hole (16) of the flue gas exhaust pipe (15) by the shielding device, and the specific steps of S7 include: the shielding device opens all the flue gas exhaust holes (16) of the flue gas exhaust pipe (15).

3. The method of claim 1, wherein In S2, adjusting the opening degree of the gas valve of the gas water heater according to the load to be detected specifically comprises the following steps: When the detected load is 2 fire, the first electromagnetic valve and the second electromagnetic valve in the gas valve of the gas water heater are both closed; When the detected load is 4 fire, the first electromagnetic valve is opened and the second electromagnetic valve is closed; When the detected load is 6 fire, the first electromagnetic valve and the second electromagnetic valve are both opened.

4. The method of claim 1, wherein In S2, adjusting the water inflow of the gas valve of the gas water heater according to the load to be detected specifically comprises the following steps: A water flow adjusting device 2 (2) is installed at the water inlet pipe (13) of the gas water heater; When the detected load is the minimum load 2PL of 2 fire, the minimum load 4PL of 4 fire and the minimum load 6PL of 6 fire, the water inflow into the gas water heater is adjusted to 5L / MIN by the water flow adjusting device 2 (2); When the detected load is the maximum load 2PH of 2 fire, the maximum load 4PH of 4 fire and the maximum load 6PH of 6 fire, the water inflow into the gas water heater is adjusted to 10L / MIN by the water flow adjusting device 2 (2).

5. The method of claim 1, wherein In S4, the combustion mode is operated for a preset time T, and after the value of the CO concentration N and the rotating speed of the fan are both stabilized, S5 is executed again.

6. The method of claim 1, wherein The step of adjusting the rotating speed of the fan of the gas water heater comprises the following steps: adjusting the rotating speed of the fan by controlling the voltage PWM duty cycle of the fan.

7. The fan rotating speed adjusting method according to any one of claims 1-6, wherein, When the detected load is the minimum load 2PL of 2 rows of fires, the minimum load 4PL of 4 rows of fires and the minimum load 6PL of 6 rows of fires, the first preset value S1 is 0.04%+0.004%, the second preset value S2 is 0.04%-0.004%, the third preset value S3 is 0.03%+0.006%, and the fourth preset value is 0.03%-0.006%; When the detected load is the maximum load 2PH of 2 rows of fires, the maximum load 4PH of 4 rows of fires and the maximum load 6PH of 6 rows of fires, the first preset value S1 is 0.05%+0.005%, the second preset value S2 is 0.05%-0.005%, the third preset value S3 is 0.04%+0.008%, and the fourth preset value is 0.04%-0.008%.

8. The method of claim 1-6, wherein When adjusting the rotating speed of the fan, the adjustment value is 50r / min each time.

9. A fan speed regulating device, characterized by, The fan rotating speed adjusting device adjusts the rotating speed of the fan of the gas water heater by using the fan rotating speed adjusting method according to any one of claims 1-8.

10. The fan speed regulation apparatus according to claim 9, wherein It comprises: a controller (3); a CO concentration detection device (5) arranged at the outlet of the smoke exhaust pipe (15) and used for detecting the CO concentration of the smoke exhaust pipe (15); a shielding device in communication connection with the controller (3) and installed on the smoke exhaust pipe (15), used for shielding part of the smoke exhaust holes (16) of the smoke exhaust pipe (15) and opening all the smoke exhaust holes (16) of the smoke exhaust pipe (15); a water flow adjusting device (2) in communication connection with the controller (3) and installed at the water inlet pipe (13) of the gas water heater.

11. The fan speed regulation apparatus according to claim 10, wherein The shielding device comprises: a driving motor (41); a smoke blocking cover (42) sleeved on the smoke exhaust pipe (15) and in transmission connection with the driving motor (41), and the driving motor (41) can drive the smoke blocking cover (42) to slide on the smoke exhaust pipe (15) to block part of the smoke exhaust holes (16) or open all the smoke exhaust holes (16).

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