CN112443964B - Gas water heater and control method thereof - Google Patents
Gas water heater and control method thereof Download PDFInfo
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- CN112443964B CN112443964B CN201910802875.6A CN201910802875A CN112443964B CN 112443964 B CN112443964 B CN 112443964B CN 201910802875 A CN201910802875 A CN 201910802875A CN 112443964 B CN112443964 B CN 112443964B
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- water heater
- impeller
- volute
- motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention discloses a gas water heater and a control method thereof. Gas heater, includes: a water heater body configured with a burner; the gas booster comprises a boosting assembly and a motor, the boosting assembly comprises a volute and an impeller, the volute is provided with a gas inlet and a gas outlet, the impeller is positioned in the volute, a rotating shaft of the motor is connected with the impeller and used for driving the impeller to rotate so as to boost and convey gas introduced from the gas inlet to the gas outlet, and the gas outlet is connected with the combustor through a pipeline; the gas pressure detection module is connected to the gas outlet and is used for detecting gas pressure on the pipeline between the combustors. The invention realizes the reduction of the whole volume of the gas turbine supercharger, so as to meet the requirements of being integrated in a gas water heater for use and realize the miniaturization design.
Description
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to a gas water heater and a control method thereof.
Background
At present, gas heater is the domestic appliance who commonly uses in people's daily life, and under the normal conditions, gas heater's gas valve is direct to be connected with the gas pipeline, and during the use, the gas valve is opened and is made the gas enter into gas heater and ignite through some firearm and burn.
Because of the influence of pressure fluctuation of the gas pipeline, in order to ensure that the gas pressure meets the use requirement of the gas water heater, the Chinese patent application No. 201510640505.9 discloses an automatic gas pressurization device and method for the gas water heater, wherein a gas booster pump is adopted to control the gas pressure so as to meet the requirement of the gas demand of the gas water heater. However, the conventional gas booster pump is limited by the structure, has a large volume and cannot be integrated into a gas water heater.
How to design a gas water heater with compact structure and small volume is the technical problem to be solved by the invention.
Disclosure of Invention
The invention provides a gas water heater and a control method thereof, which meet the requirements of integrating a gas turbocharger for use in the gas water heater by reducing the overall volume of the gas turbocharger and realize the miniaturization design of the gas water heater.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a gas water heater comprising:
a water heater body configured with a burner;
the gas booster comprises a boosting assembly and a motor, the boosting assembly comprises a volute and an impeller, the volute is provided with a gas inlet and a gas outlet, the impeller is positioned in the volute, a rotating shaft of the motor is connected with the impeller and used for driving the impeller to rotate so as to boost and convey gas introduced from the gas inlet to the gas outlet, and the gas outlet is connected with the combustor through a pipeline;
the gas pressure detection module is connected to the gas outlet and is used for detecting gas pressure on the pipeline between the combustors.
Further, the volute comprises:
the cover is provided with the air inlet and the air outlet;
the mounting seat is connected to the housing in a sealing mode, a mounting cavity is formed between the mounting seat and the housing, the air inlet and the air outlet are communicated with the mounting cavity respectively, and the impeller is located in the mounting cavity.
Furthermore, the gas outlet is arranged in the middle of the housing, the housing is further provided with an air guide pipeline, the air guide pipeline is arranged around the periphery of the gas outlet, the free end part of the air guide pipeline forms the gas inlet, and the air guide pipeline is communicated with the installation cavity.
Furthermore, a ventilation opening communicated with the mounting cavity is formed in the pipe wall of the air guide pipeline.
Furthermore, a mounting hole is formed in the mounting seat, the impeller is provided with a connecting shaft, and the connecting shaft penetrates through the mounting hole in a sealing mode and is connected with a rotating shaft of the motor.
Furthermore, a first sealing ring is sleeved on the connecting shaft and attached to the wall of the mounting hole.
Furthermore, the motor is fixed outside the supercharging shell, a second sealing ring is further arranged between the motor and the supercharging shell, and the second sealing ring surrounds the rotating shaft of the motor and the connecting shaft.
The invention also provides a control method of the gas water heater, which comprises the following steps:
after the gas water heater is started and ignited, if the gas pressure detection module detects that the gas pressure value P is lower than the set starting pressure value P0, the gas supercharger is started to supercharge the gas until the burner ignites and burns.
Further, the control method further includes:
after the gas water heater is started, in the combustion process of the combustor, if the gas pressure detection module detects that the gas pressure value P is lower than the set operation pressure value P1 and the duration exceeds t1, the gas supercharger is started to supercharge the gas so as to maintain the gas supply pressure of the combustor to be not lower than P1.
Further, the control method further includes:
after the gas water heater is started, in the combustion process of the combustor, if the gas pressure detection module detects that the gas pressure value P is lower than the set operation pressure value P1 and the gas pressure value P is accumulated for n times in unit time, the gas supercharger is started to supercharge the gas so as to maintain the gas supply pressure of the combustor not lower than P1.
Compared with the prior art, the invention has the advantages and positive effects that: through dispose gas booster in the water heater main part, volute and impeller among the gas booster form turbocharging's structure, satisfying under the condition that gas boosting required for gas booster's structure is compacter, more is favorable to satisfying the requirement of the miniaturized design of gas booster, makes gas booster can integrate in gas heater, reduces the influence to gas heater volume increase, more is favorable to using widely in gas heater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of an embodiment of a gas water heater;
FIG. 2 is a schematic view of a gas turbocharger configuration;
FIG. 3 is an exploded view of the gas turbocharger of FIG. 2;
FIG. 4 is a cross-sectional view of the gas turbocharger of FIG. 2;
FIG. 5 is a partially enlarged view of the area A in FIG. 4;
FIG. 6 is a schematic view of the housing;
FIG. 7 is a cross-sectional view of the cover;
FIG. 8 is a control flow diagram of the startup phase of a gas water heater;
fig. 9 is a control flow chart of the operation stage of the gas water heater.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 7, the gas water heater of the present embodiment generally includes a water heater main body 100, wherein the water heater main body 100 generally includes a burner 101 and other components, and the specific structure of the water heater main body 100 is not limited herein. The combustor 101 is configured to be connected to the gas turbocharger 200, and in order to more precisely control the operation of the gas turbocharger 200, the gas water heater is further configured with a gas pressure detection module 300, which is connected to a pipeline between the gas outlet 102 and the combustor and is used for detecting gas pressure. The concrete representation entity of the gas pressure detection module 300 may adopt a conventional gas pressure detection device such as a gas pressure sensor, and is not limited herein. During the use of the gas water heater, the gas pressure detection module 300 can detect the pressure of the gas to control the start, stop and operation parameters of the gas turbocharger 200.
The gas turbocharger 200 generally includes a boost assembly 1 for achieving gas boost and a driving assembly 2 for driving the boost assembly 1 to operate. In order to reduce the whole volume of the gas turbocharger, the gas turbocharger is integrally installed in a gas water heater for use. In order to reduce the overall volume of the gas turbocharger and improve the sealing performance and the safety performance of the gas turbocharger, the following structural design is correspondingly carried out. Therefore, the pressurizing assembly 1 comprises a volute 11 and an impeller 12, and the fuel gas enters the volute 11, is rotated and pressurized by the impeller 12 and then is output from the volute 11, so that the purpose of pressurizing the fuel gas is achieved. For the driving assembly 2, a motor 21 is usually used to provide power, and the motor 21 drives the impeller 12 to rotate. And because the volute 11 is adopted to realize the pressurization of the gas, the volute 11 and the impeller 12 form a structural form of turbocharging so as to realize the small-volume design of the gas turbocharger.
Wherein, for spiral case 11, in order to make things convenient for operating personnel to assemble under the prerequisite that satisfies the gas seal, then spiral case 11 includes: the impeller mounting structure comprises a housing 111 and a mounting seat 112, wherein an air inlet 101 and an air outlet 102 are formed in the housing 111, the mounting seat 112 is hermetically connected to the housing 111, a mounting cavity 10 is formed between the mounting seat 112 and the housing 111, the air inlet 101 and the air outlet 102 are respectively communicated with the mounting cavity 10, and an impeller 12 is positioned in the mounting cavity 10; the mounting base 112 is further provided with a mounting hole 1121, and the rotating shaft 211 of the motor 21 is hermetically inserted in the mounting hole 1121. Specifically, in the actual assembly process, after the rotating shaft passes through the mounting seat 112 and is connected with the impeller 12, the housing 111 and the mounting seat 112 are hermetically connected together. The motor 21 can be directly and fixedly mounted on the mounting base 112, so that the overall structure is more compact, and in order to facilitate the pipeline connection in the actual use process, the air inlet connecting pipe 3 is arranged on the air inlet 101, the air outlet connecting pipe 4 is arranged on the air outlet 102, and the pipe orifice of the air inlet connecting pipe 3 is hermetically sleeved on the air inlet 101 so as to facilitate the connection with an external gas pipeline; similarly, the mouth of the outlet connecting pipe 4 is sealed on the outlet 102 to connect with the burner of the gas-fired device.
Further, in order to meet the requirement of effective pressurization of fuel gas under the condition of small volume, the middle part of the housing 111 is provided with the gas outlet 102, the housing 111 is also provided with an air guide pipeline 1111, the air guide pipeline 1111 is arranged around the periphery of the gas outlet 102, and the free end part of the air guide pipeline 1111 forms the gas inlet 101. Specifically, the induced air duct 1111 is used for being connected with a gas duct to introduce gas, and the induced air duct 1111 can guide the gas to flow into the installation cavity 10. And since the induced air duct 1111 is distributed around the periphery of the air outlet 102, after the fuel gas flows into the installation cavity 10 through the induced air duct 1111, the fuel gas can rotate into the installation cavity 10 under the guidance of the induced air duct 1111. And the gas rotating into the mounting cavity 10 can match the rotating direction of the impeller 12, so that the gas can be uniformly distributed at the edge of the impeller 12, so that the gas can be more effectively pressurized by the impeller 12.
Wherein, induced duct 1111 wholly is helical structure, and helical structure's induced duct 1111 can make the gas at the flow in-process, reduce the windage to improve the spiral flow ability of gas, more be favorable to carrying out the pressure boost through impeller 12. Preferably, the air guiding duct 1111 has a duct wall provided with an air vent 1112 communicating with the installation cavity 10. Specifically, during the spiral flowing process of the fuel gas in the air guiding duct 1111, the fuel gas will enter the installation cavity 10 through the ventilation opening 1112 on the air guiding duct 1111. So that the combustion gas can flow into the mounting cavity 10 through the ventilation openings 1112 while being guided to flow through the induced duct 1111, to ensure a more uniform distribution of the combustion gas around the periphery of the impeller 12. In order to achieve uniform distribution of the fuel gas in the fuel gas flowing process, the cross-sectional area of the air guiding duct 1111 is gradually reduced along the gas flowing direction. Adopt the induced air pipeline 1111 of variable cross section, the gas is at induced air pipeline 1111 flow in-process, and cross sectional area reduces gradually to make the wind pressure of gas crescent, in order to ensure that the gas flow in-process, via the distribution gas supply that vent 1112 can be even. As shown by the flow direction of the air flow indicated by the arrow in fig. 6, the fuel gas enters the induced air duct 1111 through the air inlet 101 and is transmitted, and during the transmission process, the fuel gas flows to the outer circumference of the impeller 12 through the air vents 1112 in an evenly distributed manner.
For the distribution of the ventilation openings 1112, it is preferable that the ventilation openings 1112 are arranged along the extending direction of the induced duct 1111. Specifically, because the induced duct 1111 is integrally in a spiral structure and distributed around the air outlet 102, a spiral vent 1112 is formed on a duct wall of the induced duct 1111 along an extending direction of the induced duct 1111. While the fuel gas flows in the induced air duct 1111, the fuel gas uniformly enters the installation cavity 10 along the ventilation opening 1112, so that the fuel gas is uniformly distributed in each region of the installation cavity 10. The ventilation openings 1112 are disposed around the outside of the impeller 12, so that after the impeller 12 is started, the combustion gas is uniformly distributed on the periphery of the impeller 12, and the combustion gas around the impeller 12 is uniformly pressurized and accelerated by the impeller 12, so as to improve the pressurization effect of the combustion gas.
The volute is more compact in structure and more favorable for meeting the requirement of miniaturization design of the gas turbine supercharger, so that the gas turbine supercharger can be integrated in a gas water heater, the influence on the volume increase of the gas water heater is reduced, and the volute is more favorable for popularization and use in the gas water heater.
Meanwhile, in order to meet the requirement that the sealing performance of the gas turbocharger is improved in the actual use process, the gas leakage is reduced or avoided, and the requirement of improving the use safety and reliability is met. For this reason, it is necessary to effectively seal the joints of the respective components and the moving components. Since the impeller 12 needs to be connected to the external motor 21 and the impeller 12 is also a moving part, sealing of the connection between the impeller 12 and the motor 21 is important. In order to improve the sealing performance of the installation connection of the impeller 12, the impeller 12 is provided with a connection shaft 121, and the connection shaft 121 passes through the installation hole 1121 in a sealing manner and is connected with the rotating shaft of the motor 21.
Specifically, the impeller 12 is directly formed with the connecting shaft 121, and the connecting shaft 121 is inserted into the mounting hole 1121 to be connected to the rotating shaft of the motor 21. A sealing connection region is formed between the connection shaft 121 and the mounting hole 1121 to ensure that the gas leakage to the motor 21 through the mounting hole 1121 is reduced or avoided during the rotation of the impeller 12. Therefore, the leakage of the fuel gas can be effectively reduced fundamentally so as to improve the overall sealing performance. The connection shaft 121 and the mounting hole 1121 are sealed by providing a first sealing ring 51 on the connection shaft 21, the first sealing ring 51 is tightly sleeved on the connection shaft 21, and an outer ring of the first sealing ring 51 contacts with a hole wall of the mounting hole 1121, so that a connection region formed between the connection shaft 121 and the mounting hole 1121 is sealed by the first sealing ring 51. In addition, in order to facilitate the installation of the first seal ring 51, the connecting shaft 121 is provided with an annular groove 122, and the first seal ring 51 is provided in the annular groove 122, but in order to improve the sealing performance, a plurality of annular grooves 122 may be provided in the connecting shaft 121. The connection shaft 121 may be connected to the rotation shaft by a coupling, and preferably, in order to reduce the cost and reduce the overall size, the connection shaft 121 is in a shaft sleeve structure, and the rotation shaft 211 is hermetically inserted into the shaft sleeve structure formed by the connection shaft 121.
Further, in order to further block the gas leakage, a second sealing ring 52 may be further disposed between the motor 21 and the volute 11, and the second sealing ring 52 is disposed around the rotating shaft of the motor 21. Specifically, after the motor 21 is fixed to the volute 11, the second sealing ring 52 is squeezed between the motor 21 and the volute 11, and the second sealing ring 52 surrounds the periphery of the rotating shaft 211 and the connecting shaft 121 to perform a double-layer sealing function. In this way, even if the gas leaks from the mounting hole 1121, the gas is blocked by the second seal ring 52, and further leakage is prevented. The mounting hole 1121 has a stepped hole structure, a mounting groove 1123 is formed on a stepped surface 1122 of the mounting hole 1121, and the second sealing ring 52 is located in the mounting groove 1123; the motor 21 is inserted into the mounting hole 1121 and abuts against the stepped surface of the mounting hole 1121.
In addition, as for the electric motor 21, it generally includes a housing 212, a stator 213, a rotor 214 and a rotating shaft 211, the housing 212 is provided with a first bearing 215 and a second bearing 216, the stator 213 is located in the housing 212, the rotor 214 is provided on the rotating shaft 211 and located in the housing 212, the rotating shaft 211 is mounted on the first bearing 215 and the second bearing 216, the first bearing 215 is close to the volute 11, and a third sealing ring 53 is provided between the first bearing 215 and the housing 212. Specifically, the third seal ring 53 ensures the sealing property at the assembly position of the rotating shaft 211.
Preferably, even if a small amount of gas leaks from the connection region formed between the connection shaft 121 and the mounting hole 1121 during actual use, in order to improve safety and reliability, it is necessary to prevent the leaked gas from entering the inside of the motor 21. Thus, it is ensured that the gas is not ignited by the electric spark generated inside the motor 21 after the motor 21 is energized. For this reason, it is also important to avoid the leakage of the gas into the interior of the motor 21. To prevent the gas from entering the motor 21, a fourth sealing ring 2151 may be disposed between the connecting shaft 121 and the first bearing 215, and the fourth sealing ring 2151 may further seal outside the rotating shaft 211 to prevent the leaked gas from entering the motor 21 through the rotating shaft 211.
To avoid the gas entering the inside of the motor 21, the following method can be adopted: the end of the connecting shaft 121 extending out of the volute 11 is in contact with the housing of the motor 21 to form a dynamic seal area. Specifically, an end surface of the connecting shaft 121 may contact a housing of the motor 21, so that during the rotation of the impeller 12, a dynamic sealing region is formed between the housings of the motor 21 by the end surface of the connecting shaft 121, so as to prevent the leaked fuel gas from entering the interior of the motor 21 through the rotating shaft 211.
In addition, for the sealing design of the volute 11, a fifth sealing ring 54 may be arranged at the edge of the mounting seat 112, the mounting seat 112 is arranged in the housing 111, and the fifth sealing ring 54 abuts against the inner wall of the housing 111. After the impeller 12 is assembled into the scroll casing 11, the assembly connection portion of the scroll casing 11 can be effectively sealed by the fifth seal ring 54.
For more effective protection of the motor 21, the driving assembly 2 further includes a protective casing 22, the protective casing 22 is fixed on the volute casing 11, and a sixth sealing ring 55 is formed between the protective casing and the volute casing 11. The driving assembly 2 may be further provided with a control board 23 for controlling the operation of the motor 21, and the control board 23 and the motor 21 are covered and protected by a protective casing 22. For the specific circuit structure of the control board 23, reference may be made to a conventional control circuit form for driving and controlling the motor 21, which is not limited and described herein.
Through adopting the pivot of configuration connecting axle and motor on the impeller to be connected, seal the setting between the connecting axle of impeller and the mounting hole of spiral case, like this, alright reveal via the connection position of impeller and motor with the gas in avoiding the spiral case, simultaneously, adopt the mode that the impeller configuration connecting axle realizes and the mounting hole between sealed setting, when later stage is repaiied the motor again, also reduce the interference to spiral case part seal structure, more make things convenient for later stage maintenance.
The specific control method of the gas water heater in the using process comprises a method for controlling pressurization in a starting stage and a running stage respectively.
As shown in fig. 8, in the start-up phase, the gas water heater executes step S101 to start ignition, and the igniter of the gas water heater is energized to ignite. Step S102, detecting the pressure of the fuel gas by a fuel gas pressure detection module, and executing step S103 if the fuel gas pressure detection module detects that a fuel gas pressure value P is lower than a set starting pressure value P0; step S103 is to start the gas booster to boost the gas until the burner ignites and burns. Therefore, the gas water heater can be ensured to be started and ignited quickly in the starting stage of the gas water heater under the condition of low pressure of gas, so that the phenomenon that the igniter is frequently ignited and damaged is avoided.
As shown in fig. 9, during the operating phase, the burner will continue to burn gas to heat the water. However, under the influence of the fluctuation of the gas pressure, the fluctuation of the outlet water temperature caused by the unstable gas pressure can occur. For this reason, in the process of heating water by normal combustion of the gas water heater, step S201 is executed, and a gas pressure value P is detected by the gas pressure detection module; specifically, the gas pressure detection module detects the pressure value of the gas in real time in the combustion process of the gas water heater. Step S202, judging whether the gas pressure detection module detects that the gas pressure value P is smaller than a set operation pressure value P1. If P is not less than the set operation pressure value P1, step S203 is executed, the gas water heater operates normally, gas enters from the gas inlet and is output from the gas outlet, and at the moment, the motor is not started. If P is less than the set operating pressure value P1, step S204 is executed, and the gas booster is started to boost the gas to maintain the gas supply pressure of the burner not less than P1. Specifically, in the boosting process, the gas pressure detection module detects a gas pressure value P to dynamically adjust the rotation speed of a motor in the gas booster, so that the boosted gas pressure is maintained at the pressure value P1.
Preferably, in order to avoid frequent starting of the gas supercharger, the step S202 is specifically: when the detected gas pressure value P is judged to be smaller than the set operation pressure value P1, whether the duration time exceeds t1 under the condition that P is smaller than P1 is further judged, if yes, step S204 is executed, and if not, step S203 is executed. Specifically, after the gas pressure is detected to be continuously lower than the set operating pressure value P1 for the set time period t1, the pressure of the gas is considered to be insufficient, and at the moment, the gas supercharger is started again. Thus, frequent starting of the gas booster due to short-term gas fluctuations can be avoided. Likewise, step S204 may also be executed by accumulating the number of times P is less than the set operating pressure value P1 up to n times in the unit time.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding claims.
Claims (7)
1. A gas water heater, comprising:
a water heater body configured with a burner;
the gas booster comprises a boosting assembly and a motor, the boosting assembly comprises a volute and an impeller, the volute is provided with a gas inlet and a gas outlet, the impeller is positioned in the volute, a rotating shaft of the motor is connected with the impeller and used for driving the impeller to rotate so as to boost and convey gas introduced from the gas inlet to the gas outlet, and the gas outlet is connected with the combustor through a pipeline;
the motor comprises a shell, a stator, a rotor and a rotating shaft, wherein a first bearing and a second bearing are arranged on the shell, the rotating shaft is arranged on the first bearing and the second bearing, and the first bearing is close to the volute;
the gas pressure detection module is connected to a pipeline between the gas outlet and the combustor and is used for detecting gas pressure;
the volute includes:
the housing is provided with the air inlet and the air outlet;
the mounting seat is connected to the housing in a sealing manner, a mounting cavity is formed between the mounting seat and the housing, the air inlet and the air outlet are respectively communicated with the mounting cavity, and the impeller is positioned in the mounting cavity;
the impeller is provided with a connecting shaft, the connecting shaft adopts a shaft sleeve structure, and the rotating shaft is hermetically inserted into the shaft sleeve structure formed by the connecting shaft;
in addition, a first sealing ring is sleeved on the connecting shaft and is attached to the wall of the mounting hole, and a sealing connection area is formed between the connecting shaft and the mounting hole; and a third sealing ring is arranged between the first bearing and the shell, and a fourth sealing ring is arranged between the end surface of the connecting shaft and the first bearing.
2. The gas water heater of claim 1, wherein the gas outlet is provided in a middle portion of the housing, and a draft duct is further provided in the housing, the draft duct being disposed around a periphery of the gas outlet, a free end portion of the draft duct forming the gas inlet, the draft duct communicating with the mounting cavity.
3. The gas water heater of claim 2, wherein a vent is provided in a wall of the draft duct in communication with the mounting cavity.
4. The gas water heater according to claim 1, wherein the motor is fixed outside the volute, and a second sealing ring is further disposed between the motor and the volute, and the second sealing ring is disposed around the rotating shaft of the motor and the connecting shaft.
5. A control method of a gas water heater according to any one of claims 1 to 4, comprising:
after the gas water heater is started and ignited, if the gas pressure detection module detects that the gas pressure value P is lower than the set starting pressure value P0, the gas supercharger is started to supercharge the gas until the burner ignites and burns.
6. The control method of a gas water heater according to claim 5, further comprising:
after the gas water heater is started, in the combustion process of the combustor, if the gas pressure detection module detects that the gas pressure value P is lower than the set operation pressure value P1 and the duration exceeds t1, the gas supercharger is started to supercharge the gas so as to maintain the gas supply pressure of the combustor to be not lower than P1.
7. The control method of a gas water heater according to claim 5, further comprising:
after the gas water heater is started, in the combustion process of the combustor, if the gas pressure detection module detects that the gas pressure value P is lower than the set operation pressure value P1 and the gas pressure value P is accumulated for n times in unit time, the gas supercharger is started to supercharge the gas so as to maintain the gas supply pressure of the combustor not lower than P1.
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| CN201910802875.6A CN112443964B (en) | 2019-08-28 | 2019-08-28 | Gas water heater and control method thereof |
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