CN211011880U - Gas water heater capable of improving supercharging effect - Google Patents

Gas water heater capable of improving supercharging effect Download PDF

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Publication number
CN211011880U
CN211011880U CN201921044933.5U CN201921044933U CN211011880U CN 211011880 U CN211011880 U CN 211011880U CN 201921044933 U CN201921044933 U CN 201921044933U CN 211011880 U CN211011880 U CN 211011880U
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water
water pump
improving
gas
water heater
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CN201921044933.5U
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郭灵华
谢志辉
邓飞忠
仇明贵
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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Abstract

The utility model discloses a gas water heater capable of improving the supercharging effect, which comprises a gas water heater body, a water pump, an inlet water temperature detection unit, an outlet water temperature detection unit, a water flow induction unit and a controller; the water pump, the water inlet temperature detection unit, the water outlet temperature detection unit and the water flow induction unit are all connected with the controller; the water pump is a two-stage supercharging water pump or a multi-stage supercharging water pump. The utility model discloses this internal setting of gas heater that can improve the pressure boost effect can realize circulation booster water pump, through the centrifugal impeller quantity that increases the water pump, multistage impeller pressure boost step by step promotes the pressure boost ability to this water pump simple structure, small does benefit to current water heater structural upgrade and reforms transform, reduces the development and drops into.

Description

Gas water heater capable of improving supercharging effect
Technical Field
The utility model belongs to the technical field of the water heater, concretely relates to can improve gas heater of pressure boost effect.
Background
More and more water heaters in the market at present realize the functions of pressurization and zero cold water by installing water pumps in the water heaters. The main principle is as follows: after the pressurization function of the water heater is started, the built-in water pump operates to increase the flow rate, the bathing experience is improved, the zero-cold-water preheating function is started in the standby state of the water heater, the built-in water pump drives the pipeline to store water, circularly flows and heats, and the instant heating and heating are realized by using water.
The common water pump is only provided with one centrifugal impeller, the supercharging capacity of the common water pump is limited, and a supercharging type or zero-cold-water heater on the market is generally only provided with one water pump, so that when the water supply pressure is low or the pipeline resistance is large, the sufficient supercharging effect cannot be achieved, the bathing large-flow requirement is influenced, and the zero-cold-water preheating time is too long. In order to solve the problem, some water heaters adopt two or more water pumps of inside series connection installation to promote the pressure boost effect, but this mode leads to the water heater volume great and the price is higher, has reduced product market competition.
SUMMERY OF THE UTILITY MODEL
In order to solve the at least one problem, the utility model provides a can improve the gas heater of pressure boost effect improves the pressure boost effect through the water pump that can realize the circulation pressure boost effect.
The technical proposal adopted by the utility model is that,
a gas water heater capable of improving the supercharging effect comprises a gas water heater body, a water pump, an inlet water temperature detection unit, an outlet water temperature detection unit, a water flow induction unit and a controller; the water pump and the water flow sensing unit are arranged on a water path in the gas water heater body, the water inlet temperature detection unit and the water outlet temperature detection unit are respectively arranged at the water inlet end and the water outlet end of the water path, and the water pump, the water inlet temperature detection unit, the water outlet temperature detection unit and the water flow sensing unit are all connected with the controller; the water pump is a two-stage supercharging water pump or a multi-stage supercharging water pump.
The water pump comprises a motor assembly, a shell assembly and a rotating assembly, wherein the output end of the motor assembly is connected with the rotating assembly to drive the rotating assembly to rotate, and the shell assembly is sleeved on the peripheries of the motor assembly and the rotating assembly; the rotating assembly comprises at least two centrifugal impellers, and the at least two centrifugal impellers are arranged in parallel and used for improving the supercharging effect.
Preferably, the rotating assembly further comprises a straight pipe, a rotor and at least two centrifugal impellers, the rotor and the centrifugal impellers are respectively sleeved on two sides of the straight pipe, and the at least two centrifugal impellers are arranged in parallel and used for improving the supercharging effect.
Preferably, centrifugal impeller includes protecgulum, hou gai, impeller inlet opening, arc blade and impeller apopore, the relative formation cavity that sets up around protecgulum and the hou gai, the impeller inlet opening sets up on the protecgulum, arc blade sets up in the cavity between protecgulum and hou gai, the impeller apopore distributes on the periphery behind protecgulum and the cooperation of hou gai.
Preferably, the motor assembly comprises a base, a stator, a water pump inner container and a rotating shaft, the water pump inner container is nested in the base, the rotating shaft is installed on the axis of the water pump inner container, and the stator is arranged on the outer wall of the water pump inner container.
Preferably, the base is the open bowl form hollow body of one end, the water pump inner bag is the cylindrical hollow casing of one end confined, opens one end and sets up the outer flange, and the whole dress of water pump inner bag is inlayed inside the base, and the outer flange is with the laminating of the open terminal surface of base.
Preferably, casing subassembly includes water pump cavity, annular baffle, little die cavity, apopore, inlet opening and water pump shell, the water pump shell is the open, one end confined bowl form cavity casing of one end, and the open end face is connected with the laminating of water pump inner bag and is formed the water pump cavity, the inside annular baffle that has central through hole that is provided with of water pump shell, the annular baffle is cut apart into two at least little die cavities of intercommunication with the water pump cavity the outer fringe tangential direction of the first little die cavity of water pump shell open end face is provided with the water hole, sets up the inlet opening at water pump shell closed end face.
Preferably, the number of the centrifugal impellers is the same as the number of the mini-chambers, and the centrifugal impellers are arranged in the mini-chambers.
Preferably, the clearance between the front cover and the inner wall surface of the small cavity is smaller than the clearance between the rear cover and the inner wall surface of the small cavity.
Preferably, a bearing hole is formed in the water inlet hole of the shell assembly, the rotating shaft of the motor assembly extends to the bearing hole, and the bearing hole supports the rotating shaft and limits the moving position of the rotating assembly so as to prevent the centrifugal impeller from shaking.
Preferably, the centrifugal pump further comprises an annular sealing ring, and the annular sealing ring is arranged on a joint surface between the water pump shell and the water pump liner.
Preferably, the water pump housing comprises a front housing and a rear housing, the front housing and the rear housing are arranged oppositely, and the annular sealing ring is further arranged at the joint of the front housing and the rear housing.
Preferably, the centrifugal pump further comprises a guide basin disposed between the annular partition and the rear cover for increasing a flow rate.
Compared with the prior art, the utility model discloses this internal water pump that can realize circulation pressure boost function that sets up of gas heater, through the centrifugal impeller quantity that increases the water pump, multistage impeller pressure boost step by step promotes the pressure boost ability by a wide margin to this water pump simple structure, small does benefit to current water heater structural upgrade and reforms transform, reduces the development and drops into.
Drawings
Fig. 1 is a schematic structural diagram of a gas water heater capable of improving a pressurization effect according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a gas water heater capable of improving a pressurization effect according to an embodiment of the present invention in a working state;
fig. 3 is a sectional view of a multistage supercharging centrifugal pump in a gas water heater capable of improving supercharging effect according to an embodiment of the present invention;
fig. 4 is a cross-sectional view of a centrifugal impeller of a gas water heater capable of improving a pressurization effect according to an embodiment of the present invention;
fig. 5 is a cross-sectional view of a gas water heater with three centrifugal impellers, which is provided by the embodiment of the present invention and can improve the pressurization effect;
fig. 6 is a cross-sectional view of another structure of a gas water heater capable of improving the pressurization effect according to an embodiment of the present invention;
fig. 7 is an exploded view of a gas water heater capable of improving pressurization effect according to an embodiment of the present invention;
fig. 8 is an exploded view of another structure of a gas water heater capable of improving the pressurization effect according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a flow guiding plate in a gas water heater capable of improving a pressurization effect according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a splitter plate in a gas water heater capable of improving a pressurization effect according to an embodiment of the present invention;
fig. 11 is a flow chart of the circular preheating of the gas water heater capable of improving the pressurization effect according to the embodiment of the present invention;
fig. 12 is a flow chart of the gas water heater provided by the embodiment of the present invention when the gas water heater is pressurized, which can improve the pressurization effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the utility model provides a gas water heater capable of improving the supercharging effect, as shown in fig. 1-2, comprising a gas water heater body 1, a water pump 2, an inlet water temperature detection unit 3, an outlet water temperature detection unit 4, a water flow induction unit 5 and a controller 6; the water pump 2 and the water flow sensing unit 5 are arranged on a water path 7 in the gas water heater body 1, the water inlet temperature detection unit 3 and the water outlet temperature detection unit 4 are respectively arranged at the water inlet end and the water outlet end of the water path 7, and the water pump 2, the water inlet temperature detection unit 3, the water outlet temperature detection unit 4 and the water flow sensing unit 5 are all connected with the controller 6; the water pump 2 is a two-stage supercharging or multi-stage supercharging water pump;
like this, adopt above-mentioned structure, promote gas heater's pressure boost ability through the water pump 2 that can realize circulation pressure boost function.
As shown in fig. 3 and 7, the water pump includes a motor assembly 21, a housing assembly 22, and a rotation assembly 23, wherein:
the output end of the motor assembly 21 is connected with the rotating assembly 23 to drive the rotating assembly to rotate, and the shell assembly 22 is sleeved on the peripheries of the motor assembly 21 and the rotating assembly 23;
the rotating assembly 23 comprises a straight pipe 231, a rotor 232 and at least two centrifugal impellers 233, the at least two centrifugal impellers 33 are arranged in parallel for improving the supercharging effect, and the rotor 232 and the centrifugal impellers 233 are respectively sleeved on two sides of the straight pipe 231;
the shell assembly 22 and the motor assembly 21 are fixedly connected through a plurality of long bolts 25.
Like this, adopt above-mentioned structure, the output shaft of electronic component 21 drives runner assembly 23 work, and runner assembly 23 is at the in-process of work, and at least two-stage centrifugal impeller 233 carries out pressure boost step by step, has promoted the pressure boost effect.
As shown in fig. 3 and 4, the centrifugal impeller 233 includes a front cover 2331, a rear cover 2332, an impeller inlet hole 2333, an arc-shaped vane 2334, and an impeller outlet hole 2335, wherein:
the front cover 2331 and the rear cover 2332 are oppositely arranged in front and rear to form a hollow cavity, the impeller water inlet 2333 is arranged on the front cover 2331, the arc-shaped blades 2334 are arranged in the hollow cavity between the front cover 2331 and the rear cover 2332, and the impeller water outlet 2335 is distributed on the circumference surface of the front cover 2331 matched with the rear cover 2332;
thus, when the centrifugal impeller 233 rotates, water flowing into the cavity of the centrifugal impeller 233 from the impeller inlet hole 2333 is discharged outwardly from the impeller outlet hole 2335 by the arc-shaped blades 2334.
The motor assembly 21 comprises a base 211, a stator 212, a water pump inner container 213 and a rotating shaft 214, the water pump inner container 213 is nested in the base 211, the rotating shaft 214 is installed on the axis of the water pump inner container 213, and the stator 212 is arranged on the outer wall of the water pump inner container 213.
The base 211 is a bowl-shaped hollow body with an open end, the water pump liner 213 is a cylindrical hollow shell with a closed end, an outer flange 2131 is arranged at the open end, the water pump liner 213 is integrally embedded in the base 211, and the outer flange 2131 is attached to the open end face of the base 211;
thus, the rotating shaft 214 of the motor assembly 21 passes through the straight pipe 231 of the rotating assembly 23, and the rotating assembly 23 rotates around the rotating shaft 214; the rotor 232 of the motor is positioned inside the water pump inner tank 213, and the centrifugal impeller 233 is positioned outside the outer flange 2131 of the water pump inner tank 213.
The housing assembly 22 includes a water pump cavity 221, an annular partition 222, a small cavity 223, a water outlet 224, a water inlet 225 and a water pump housing 226, the water pump housing 226 is a bowl-shaped hollow housing with one open end and one closed end, the open end face is attached to the water pump inner container 213 to form the water pump cavity 221, the annular partition 222 with a central through hole 2221 is arranged inside the water pump housing 226, the annular partition 222 divides the water pump cavity 221 into at least two small cavities 223 that are communicated with each other, a water hole 224 is arranged in the tangential direction of the outer edge of the first small cavity 223 of the open end face of the water pump housing 226, and the water inlet 225 is arranged on the closed end face of the water pump housing.
In addition, the number of the centrifugal impellers 233 is the same as that of the small cavities 223, and the centrifugal impellers 233 are arranged in the small cavities 223;
the gap between the front cover 2331 and the inner wall surface of the small cavity 223 is smaller than the gap between the rear cover 2332 and the inner wall surface of the small cavity 223;
in addition, the centrifugal impeller 233 in the small cavity 223 is closer to the water inlet end of each small cavity 223, that is, the gap between the front cover 2331 and the inner wall surface of the small cavity 223 is smaller than the gap between the impeller back cover 2332 and the inner wall surface of the small cavity 223, a wider flow passage is formed between the annular partition 222 and the impeller back cover 2332 of the centrifugal impeller 233, and when the centrifugal impeller 233 rotates, more water thrown away from the centrifugal impeller 233 flows from the wider flow passage on the impeller back cover 2332 side to the next small cavity 223, so that the water backflow phenomenon is reduced.
In order to increase the water discharge speed and increase the pressurization effect, the impeller outlet 2335 of the first centrifugal impeller 233 close to the water pump liner 213 is located on the same plane as the outlet 224 of the housing assembly 22.
A bearing hole 227 is formed in the water inlet hole 225 of the housing assembly 22, the rotating shaft 214 of the motor assembly 21 extends to the bearing hole 227, and the bearing hole 227 supports the rotating shaft 214 and defines the moving position of the rotating assembly 23 for preventing the centrifugal impeller 233 from shaking.
The water pump 2 further includes an annular gasket 24, the annular gasket 24 being disposed on an interface between the water pump housing 226 and the water pump liner 213.
The water pump housing 226 comprises a front housing 2261 and a rear housing 2262, the front housing 2261 and the rear housing 2262 are arranged in a front-to-rear opposite manner, and the annular sealing ring 24 is further arranged at the joint of the front housing 2261 and the rear housing 2262;
the water pump housing 226 further includes a middle housing 2263, the middle housing 2263 is disposed between the front housing 2261 and the rear housing 2262, and the front housing 2261, the middle housing 2263 and the rear housing 2262 are sequentially connected; the ring seals 4 are further provided at the junctions of the front housing 2261 and the middle housing 2263, the middle housing 2263 and the rear housing 2262;
in addition, the water pump housing 226 is assembled in a split manner, which facilitates the assembly of the adjacent centrifugal impellers 233.
As shown in fig. 6 and 8, the centrifugal pump further includes a guide basin 26, the guide basin 26 being disposed between the annular partition 222 and the rear cover 2332 for increasing the flow rate;
as shown in fig. 7 and 8, a plurality of peripheral through holes 261 are formed in the periphery of the baffle disc 26, a central hole 262 for fixing the straight pipe 231 is formed in the center of the baffle disc 26, and a gap between the baffle disc 26 and the rear cover 2332 is smaller than a gap between the baffle disc 26 and the annular partition 222; a flow dividing plate 263 is arranged between the flow deflector 26 and the annular partition 222, and the direction of the channel of the flow dividing plate 263 is consistent with the direction of water flow;
thus, when the centrifugal impeller 233 rotates, the thrown water flows through the peripheral through hole 261 of the deflector 26 and then flows along the surface of the deflector 26 to the impeller water inlet hole 2333 of the next centrifugal impeller 233, and since the deflector 26 does not rotate along with the centrifugal impeller 233, the water flow traction force of the wall surface of the centrifugal impeller 233 is eliminated, which is more beneficial to the rapid flow of water and improves the step-by-step pressurizing effect; and the channel direction of the flow dividing plate 263 is consistent with the water flow direction, which helps to further reduce the water turbulence and increase the water flow speed.
The working process is as follows:
the circular preheating of the gas water heater is realized as shown in fig. 11, the preheating function of the gas water heater capable of improving the supercharging effect is started in a standby state, the water pump 2 is started to drive the circulating pipeline to store water to circularly flow, the water flow sensing unit 5 detects the circulating flow, and when the circulating flow is larger than the program starting flow, the gas water heater is started to ignite and heat; the water stored in the water return pipe flows into the water heater to be heated, then flows into the hot water pipe, and then flows back to the water inlet end of the water heater through the water return pipe again, when the water return temperature detected by the water return temperature detection unit is higher than the program preheating temperature, the preheating is quitted, and the water pump 2 is closed. The stronger the supercharging capacity of the water pump 2 is, the larger the circulation flow rate of the same circulation pipeline state is, and the shorter the preheating time is.
The pressurization function of the gas water heater is realized as shown in fig. 12, when the water flow sensing unit 5 detects that the flow of the tap water is greater than the program starting flow, the water pump 2 is started, and the gas water heater is started to ignite and heat, and the water pump 2 can increase the flow of the tap water; in the pressurization mode, when the measured tap water flow is smaller than the program shutdown flow, the water pump 2 is closed, and the pressurization mode is exited. The stronger the supercharging capacity of the water pump 2 is, the larger the tap water flow in the same pipeline state is, and the better the bathing experience is.
The working process of the water pump 2 is as shown by arrows in fig. 3, 5 and 6, the output shaft of the motor assembly 21 drives the centrifugal impeller 233 of the rotating assembly 23 to rotate, and in the process of rotating the centrifugal impeller 233, water thrown away from the centrifugal impeller 233 flows from the wider flow passage on the impeller back cover 2332 side to the next small cavity 223, flows through the through hole 261 on the periphery of the deflector 26, flows along the surface of the deflector 26 to the impeller water inlet 2333 of the next centrifugal impeller 233, is pressurized step by at least two stages of centrifugal impellers 233, and finally flows out from the water outlet 224.
This embodiment can realize the water pump of circulation pressure boost function at this internal setting of gas heater, and through the centrifugal impeller quantity that increases the water pump, multistage impeller pressure boost step by step promotes the pressure boost ability by a wide margin to this water pump simple structure, small do benefit to current water heater structural upgrade and reform transform, reduce the development input, improved the market competition of product.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (13)

1. A gas water heater capable of improving the supercharging effect is characterized by comprising a gas water heater body (1), a water pump (2), an inlet water temperature detection unit (3), an outlet water temperature detection unit (4), a water flow induction unit (5) and a controller (6); the water pump (2) and the water flow sensing unit (5) are arranged on a water path (7) in the gas water heater body (1), the water inlet temperature detection unit (3) and the water outlet temperature detection unit (4) are respectively arranged at the water inlet end and the water outlet end of the water path (7), and the water pump (2), the water inlet temperature detection unit (3), the water outlet temperature detection unit (4) and the water flow sensing unit (5) are all connected with the controller (6); the water pump (2) is a two-stage supercharging water pump or a multi-stage supercharging water pump.
2. The gas water heater capable of improving the pressurization effect according to claim 1, wherein the water pump (2) comprises a motor assembly (21), a housing assembly (22) and a rotating assembly (23), the output end of the motor assembly (21) is connected with the rotating assembly (23) to drive the rotating assembly (23) to rotate, and the housing assembly (22) is sleeved on the peripheries of the motor assembly (21) and the rotating assembly (23).
3. The gas water heater capable of improving the pressurization effect according to claim 2, wherein the rotating assembly (23) comprises a straight pipe (231), a rotor (232) and at least two centrifugal impellers (233), the rotor (232) and the centrifugal impellers (233) are respectively sleeved on two sides of the straight pipe (231), and the at least two centrifugal impellers (233) are arranged in parallel for improving the pressurization effect.
4. The gas water heater capable of improving the pressurization effect as claimed in claim 3, wherein the centrifugal impeller (233) comprises a front cover (2331), a rear cover (2332), an impeller water inlet hole (2333), an arc-shaped blade (2334) and an impeller water outlet hole (2335), the front cover (2331) and the rear cover (2332) are oppositely arranged in front and rear to form a hollow cavity, the impeller water inlet hole (2333) is arranged on the front cover (2331), the arc-shaped blade (2334) is arranged in the hollow cavity between the front cover (2331) and the rear cover (2332), and the impeller water outlet holes (2335) are distributed on the circumferential surface of the front cover (2331) and the rear cover (2332) after being matched.
5. The gas water heater capable of improving the pressurization effect according to claim 4, wherein the motor assembly (21) comprises a base (211), a stator (212), a water pump inner container (213) and a rotating shaft (214), the water pump inner container (213) is nested in the base (211), the rotating shaft (214) is installed on the axis of the water pump inner container (213), and the stator (212) is arranged on the outer wall of the water pump inner container (213).
6. The gas water heater capable of improving the supercharging effect according to claim 5, wherein the base (211) is a bowl-shaped hollow body with one open end, the water pump liner (213) is a cylindrical hollow shell with one closed end, an outer flange (2131) is arranged at the open end, the water pump liner (213) is integrally embedded in the base (211), and the outer flange (2131) is attached to the open end face of the base (211).
7. The gas water heater capable of improving pressurization effect according to claim 6, the shell component (22) comprises a water pump cavity (221), an annular partition plate (222), a small cavity (223), a water outlet hole (224), a water inlet hole (225) and a water pump shell (226), the water pump shell (226) is a bowl-shaped hollow shell with one open end and one closed end, the open end surface is jointed and connected with the water pump inner container (213) to form a water pump cavity (221), an annular partition plate (222) with a central through hole (2221) is arranged inside the water pump shell (226), the annular partition plate (222) divides the water pump cavity (221) into at least two small cavities (223) which are communicated with each other, the water outlet (224) is arranged in the tangential direction of the outer edge of the first small cavity (223) on the open end face of the water pump shell (226), and the water inlet (225) is arranged on the closed end face of the water pump shell (226).
8. The gas water heater capable of improving pressurization effect according to claim 7, wherein the number of the centrifugal impellers (233) is the same as that of the small cavities (223), and the centrifugal impellers (233) are arranged in the small cavities (223).
9. The gas water heater capable of improving pressurization effect as claimed in claim 7, wherein the gap between the front cover (2331) and the inner wall surface of the small chamber (223) is smaller than the gap between the rear cover (2332) and the inner wall surface of the small chamber (223).
10. The gas water heater capable of improving supercharging effect according to claim 8 or 9, wherein a bearing hole (227) is provided at the water inlet hole (225) of the housing assembly (22), the rotating shaft (214) of the motor assembly (21) extends to the bearing hole (227), and the bearing hole (227) supports the rotating shaft (214) and defines a moving position of the rotating assembly (23) for preventing the centrifugal impeller (233) from shaking.
11. The gas water heater capable of improving pressurization effect according to claim 7, wherein the water pump (2) further comprises an annular sealing ring (24), and the annular sealing ring (24) is arranged on a joint surface between the water pump shell (226) and the water pump inner container (213).
12. The gas water heater capable of improving pressurization effect according to claim 11, wherein the water pump housing (226) comprises a front housing (2261) and a rear housing (2262), the front housing (2261) and the rear housing (2262) are arranged in a front-rear opposite manner, and the annular sealing ring (24) is further arranged at the joint of the front housing (2261) and the rear housing (2262).
13. The gas water heater capable of enhancing pressurization effect as claimed in claim 9, further comprising a guide basin (26), wherein said guide basin (26) is disposed between the annular partition plate (222) and the rear cover (2332) for increasing flow rate.
CN201921044933.5U 2019-07-05 2019-07-05 Gas water heater capable of improving supercharging effect Active CN211011880U (en)

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CN201921044933.5U CN211011880U (en) 2019-07-05 2019-07-05 Gas water heater capable of improving supercharging effect

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Application Number Priority Date Filing Date Title
CN201921044933.5U CN211011880U (en) 2019-07-05 2019-07-05 Gas water heater capable of improving supercharging effect

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110307635A (en) * 2019-07-05 2019-10-08 华帝股份有限公司 Gas water heater capable of improving supercharging effect

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110307635A (en) * 2019-07-05 2019-10-08 华帝股份有限公司 Gas water heater capable of improving supercharging effect

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