WO2016197902A1

WO2016197902A1 - Balanced gas water heating device

Info

Publication number: WO2016197902A1
Application number: PCT/CN2016/085041
Authority: WO
Inventors: 邱步; 朱高涛; 朱立夫
Original assignee: 艾欧史密斯(中国)热水器有限公司
Priority date: 2015-06-09
Filing date: 2016-06-07
Publication date: 2016-12-15
Also published as: CN104913486B; CN104913486A

Abstract

Disclosed is a balanced gas water heating device, comprising a sealed chamber (11), and an air inlet duct (2) and a smoke discharge duct (3) which are provided on the sealed chamber (11); and a variable-speed fan (4), a heat exchanging device (5) and a combustion device (6) which are provided inside the sealed chamber (11). The variable-speed fan (4) has a fan volute (41). The air inlet duct (2) is in communication with the combustion device (6) and the heat exchanging device (5) successively, the heat exchanging device (5) is in communication with an inlet of the fan volute (41), and an outlet of the fan volute (41) is in communication with the smoke discharge duct (3). The variable-speed fan (4) further comprises: a drainage device and a variable-speed motor (42) which are provided on an external part of the fan volute (41), wherein the variable-speed motor (42) comprises a winding, the drainage device can lead at least part of the air entering the air inlet duct (2) into the variable-speed motor (42) and make the same pass through the winding, and a fan control device (46) is provided on an external part of the sealed chamber. The application of the structure enables the air entering the sealed chamber (11) to flow into the interior of the fan and pass through the fan winding, and the fan control device (46) is provided outside the inner sealed chamber to improve the service life of electronic elements of the fan control device (46), thereby improving the reliability and service life of the overall machine.

Description

Balanced gas water heater

Cross reference related reference

The present application claims the priority of the Chinese Patent Application No. 201510314396.1, filed on Jun.

Technical field

The invention relates to a gas hot water device, in particular to a balanced gas water heater.

Background technique

Gas-fired water heaters can be mainly divided into flue-type, strong-discharge type and balanced type. The air required for combustion of flue-type and strong-discharge type gas-fired water heaters comes from indoors, and consumes a large amount of oxygen in the combustion process. The air required for the combustion of the balanced gas water heater is from the outside, and the exhaust gas is also discharged to the outside. Therefore, the balanced gas water heater has higher safety than the flue gas type and the strong exhaust gas water heater. Sex. At present, such a balanced system that uses outdoor air intake and exhausts exhaust gas after combustion to the outside is widely used in the field of wall-hung boilers, and gas water heaters are gradually being promoted.

The balanced gas water heater generally has a sealed chamber in which a combustion system and a heat exchange system are installed. During the operation of the balanced gas water heater, the exhaust gas generated by the combustion is discharged to the outside through the exhaust pipe under the driving of the fan placed in the sealed chamber. At this time, a negative pressure environment is formed in the sealed chamber, and the outdoor environment is formed. Fresh air is drawn into the sealed chamber through the intake manifold. This part of the fresh air from the outside ensures that the balanced gas water heater maintains normal combustion.

As an important part of the gas water heater, the fan plays a key role in the operation of the entire system. At present, the fixed speed fan is widely used in the gas hot water industry due to its simple structure and convenient manufacture. However, in the process of use, there are problems such as low thermal efficiency and large noise in the middle and small load sections, mainly because the machine burns in the middle and small load sections. When a large amount of combustion heat is discharged to the machine by a higher-speed fixed-speed fan, the heat exchange system does not make good use of this part of the heat, resulting in reduced thermal efficiency and wasted energy. To solve this problem, variable-speed fans are commonly used in the industry. Instead of a fixed speed fan, the variable speed fan can be adjusted according to the speed. Different fan speeds can be matched in different combustion states. Therefore, the energy consumption can be reduced to a large extent, and the noise can be reduced.

At present, there are still relatively few products that use variable speed fans in balanced gas water heaters, especially in the wall-hung boiler industry. The main reason is that the balanced gas water heater has an inner sealed chamber, which contains a combustion system and a heat exchange system. The combustion system and the heat exchange system radiate a large amount of heat during operation, which makes The temperature in the sealed chamber is relatively high, generally can reach 80 °C, and the severe working conditions may even reach 100 °C. In the balanced gas water heater, most of the fan is located inside the closed chamber. The structure placed inside the sealed chamber keeps the variable speed fan at a relatively high temperature for a long time. After the variable speed fan is used, the electronic components of the motor control device of the variable speed fan generate heat during operation, and this part of the heat will be sealed. The superposition of heat in the chamber causes a large increase in the temperature of the motor control board. In addition, the motor of the fan generates more heat in the winding of the motor during its own operation, which also increases the risk of failure of the fan, which is common to the above factors. Under the action, the variable speed fan easily accumulates heat beyond the limit of the variable speed fan during operation, which causes it to fail. Therefore, the above problems have great risks to the application of the variable speed fan in the balanced gas water heater to the reliability and life of the variable speed fan itself and the whole machine.

Summary of the invention

In order to overcome the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a balanced gas water heater device to ensure the reliability of the operation of the whole machine.

The technical solution of the present invention is specifically as follows:

A balanced gas water heater includes:

Sealing chamber;

An intake passage and a smoke exhaust passage disposed on the sealed chamber;

a variable speed fan, a heat exchange device, and a combustion device disposed inside the sealed chamber;

The variable speed fan has a fan volute;

The intake passage is in communication with the combustion device and the heat exchange device, the heat exchange device is in communication with the fan volute inlet, and the fan volute outlet is connected to the exhaust passage;

The variable speed fan further includes: a drainage device and a variable speed motor disposed outside the volute of the fan, the variable speed motor including a winding, the drainage device capable of introducing at least a portion of the air entering the intake passage into the variable speed motor And through the windings.

Preferably, the variable speed motor includes a motor housing having a first end cover and a second end cover, the first end cover and the second end cover are provided with through holes, and the winding is disposed in the motor housing The airflow introduced by the drainage device can pass through the through holes in the first end cover and the second end cover.

Preferably, the first end cover and the second end cover are oppositely disposed.

Preferably, the first end cover of the motor housing faces away from the fan volute, and the second end cover of the motor housing faces the fan volute.

Preferably, the drainage device is an axial fan, and the axial fan is disposed between the motor casing and the fan volute.

Preferably, the drainage device is an axial fan, and the axial fan is disposed on a side of the variable speed motor facing away from the volute of the fan.

Preferably, further comprising a cooling fan disposed between the variable speed motor and the fan volute, the cooling fan enabling airflow flowing through the winding from between the variable speed motor and the fan volute Space is scattered.

Preferably, the variable speed motor is provided at the outlet of the intake passage.

Preferably, a fan control device is further included, the fan control device being disposed outside the sealed chamber.

Preferably, the variable speed fan includes a Hall element electrically connected to the fan control device, and the Hall element is disposed inside the motor housing.

Preferably, the intake passage surrounds the exhaust passage arrangement.

Preferably, the intake passage and the exhaust passage are coaxially disposed and located at the top of the sealed chamber.

Preferably, the intake passage and the exhaust passage are separately disposed at the top of the sealed chamber.

Preferably, the variable speed fan includes an impeller connected to the variable speed motor via a motor shaft, the variable speed motor shaft being perpendicular to an axis of the intake passage.

The present invention adopts the above structure and has the following advantages:

1. By providing a drainage device on the variable speed fan and opening a hole in the casing of the variable speed motor, air entering the sealed chamber can enter the interior of the variable speed motor to cool the components inside the variable speed motor, and further pass The fan control device is externally disposed, which prevents the fan control device from blocking the airflow entering the variable speed motor, so that the air can smoothly enter the variable speed motor and pass through the winding and then flow out of the motor under the action of the drainage device, thereby forming a fan. The cooling "wind system", while the fan control device is disposed outside the sealed chamber, avoids the influence of the high temperature environment in the sealed chamber on the electronic components on the fan control device, and improves the reliability and life of the variable speed fan;

2. The cooling fan rapidly discharges the high-temperature air flowing out of the motor from the variable speed motor and the fan volute to the sealed chamber. On the one hand, the flow rate of the cold air in the casing of the variable speed motor can be further increased, thereby increasing the cooling rate; It can avoid the temperature rise of the motor caused by the high temperature air accumulated here.

3. The variable speed motor is disposed at the outlet of the intake passage, so that the cold air discharged from the outlet of the intake passage can be directly blown to the motor to cool the motor.

DRAWINGS

The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. In addition, the shapes, proportions, and the like of the components in the drawings are merely illustrative and are intended to assist the understanding of the present invention and are not intended to limit the shapes and proportions of the components of the present invention. Those skilled in the art, in light of the teachings of the present invention, may choose various possible shapes and ratios to implement the present invention.

1 is a schematic structural view of a specific embodiment of a balanced gas water heater according to the present application.

Figure 2 is a perspective view of the variable speed fan of Figure 1.

3 is another perspective view of the variable speed fan of FIG. 1.

4 is a schematic structural view of a first end cover of the motor of the variable speed fan of FIG. 1.

FIG. 5 is a schematic structural view of a second end cover of the motor of the variable speed fan of FIG. 1. FIG.

6 is a schematic structural view of another embodiment of a balanced gas water heater according to the present application.

The reference numerals of the above drawings are: 1, housing; 11, sealed chamber; 2, intake passage; 3, exhaust passage; 4, variable speed fan; 41, fan volute; 411, intake end; , exhaust end; 42, variable speed motor; 421, first end cover; 4211, through hole of the first end cover; 422, second end cover; 4221, through hole of the second end cover; 43, axial flow fan; 44, cooling fan; 45, protective cover; 451, through hole; 46, fan control device; 5, heat exchange device; 6, burning device; 7, collecting hood.

detailed description

The details of the present invention can be more clearly understood from the description of the drawings and the description of the invention. However, the specific embodiments of the invention described herein are intended to be illustrative only and not to be construed as limiting the invention. Those skilled in the art can devise any possible variations based on the present invention, which are considered to be within the scope of the present invention.

The present invention discloses a balanced gas water heater, comprising a sealed chamber 11, an intake passage 2 and a smoke exhaust passage 3 disposed on the sealed chamber 11, and a shifting speed disposed inside the sealed chamber 11. a fan 4, a heat exchange device 5, and a combustion device 6, the variable speed fan 4 having a fan volute 41; the intake passage 2 is in communication with the combustion device 6 and the heat exchange device 5 in sequence, the heat exchange device 5 and The fan volute 41 is connected to the inlet, and the outlet of the fan volute 41 is connected to the exhaust passage 3; the variable speed fan 4 further includes: a drainage device and a variable speed motor 42 disposed outside the fan volute 41, The variable speed motor 42 includes a winding that can introduce air entering the intake passage 2 at least partially into the variable speed motor 42 and through the winding. In the present embodiment, the variable speed motor 42 is a direct current motor. In other embodiments, the variable speed motor 42 can also be an AC variable speed motor.

The balanced gas water heater of the present application can introduce air entering the sealed chamber 11 into the variable speed motor 42 through the drain device, so that the temperature entering the sealed chamber 11 is low. The air exchanges heat with the windings of the variable speed motor 42 to lower the temperature of the windings of the variable speed motor 42. After repeated trials and trials by the inventors, it has been proved that the failure rate of the variable speed fan 4 is greatly reduced by the balanced gas water heater of the present application.

Fig. 1 is a schematic view showing a specific structure of a balanced gas water heater of the present application. Referring to FIG. 1 , the balanced gas water heating device comprises a casing 1 , a sealed chamber 11 is formed in the casing 1 , an intake passage 2 and a smoke exhaust passage 3 are arranged on the casing 1 , a variable speed fan 4 and a heat exchange device 5. The combustion device 6 and the collecting hood 7 are located in the sealed chamber 11. During the operation of the machine, air enters the sealed chamber 11 from the intake passage 2, and flows into the combustion device 6 under the driving of the variable speed fan 4 to participate in combustion, and the high-temperature flue gas generated after the combustion passes through the heat exchange device 5 and the collecting hood. After 7, the variable speed fan 4 is entered, and finally discharged from the exhaust passage 3 to the outside under the driving of the variable speed fan 4.

In the present embodiment, referring to FIG. 1 , the intake passage 2 and the exhaust passage 3 may be respectively disposed at the top of the sealed chamber 11 . The intake passage 2 is coaxially sleeved outside the exhaust passage 3 and surrounds the exhaust passage 3 . Of course, in other embodiments, the intake passage 2 and/or the exhaust passage 3 may not be disposed at the top of the sealed chamber 11 as long as the intake passage 2 can introduce outdoor air into the sealed chamber 11 to exhaust smoke. The passage 3 can discharge the flue gas generated by the combustion out of the sealed chamber 11.

In the present embodiment, the balanced gas water heater further includes a variable speed fan 4. Referring to FIGS. 2 and 3, the variable speed fan 4 includes a variable speed motor 42, an impeller, a fan volute 41 that is disposed outside the impeller, an intake end 411 of the fan volute 41, and the heat exchange device. 5 communicating, the exhaust end 412 of the fan volute 41 passes out of the sealed chamber 11 and communicates with the exhaust passage 3. When the impeller of the variable speed fan 4 is rotating, the flue gas generated by the combustion flows into the exhaust duct 3 through the fan volute 41. In a preferred embodiment, the balanced gas water heater further includes a collecting hood 7 disposed between the variable speed fan 4 and the heat exchange device 5 and having one end connected to the heat exchange device 5, The other end is in communication with the intake end 411 of the variable speed fan 4, and the fume collecting hood 7 can collect the flue gas after the heat exchange and discharge the flue gas through the variable speed fan 4. The variable speed fan 4 also includes a drainage device. The draining device is disposed inside the sealed chamber 11 and is adapted to the variable speed motor 42 to introduce at least a portion of the cold air entering the sealed chamber 11 through the intake passage into the variable speed motor 42. In the present embodiment, referring to FIGS. 4 and 5, the variable speed motor 42 includes a motor housing having a first end cap 421 and a second end cap 422, the first end cap 421 and the second end. The cover 422 is provided with a through hole, and the winding is disposed in the motor casing, and the airflow introduced by the drainage device can pass through the through hole 4211 on the first end cover 421 and the second end cover 422 Through hole 4221. The first end cover 421 of the variable speed motor 42 faces away from the fan volute 41, and the second end of the variable speed motor 42 Cover 422 faces the fan volute 41. The flow guiding device includes an axial flow fan 43 disposed on a side of the variable speed motor 42 facing away from the fan volute 41, that is, the air sucked by the axial flow fan 43 from the motor housing A through hole 4211 in the one end cover 421 enters the inside of the motor casing and is discharged from the through hole 4221 on the second end cover 422 of the motor casing after passing through the winding of the variable speed motor 42. In the present embodiment, the cold air entering the motor casing exchanges heat with the windings of the variable speed motor 42 to carry heat from the windings of the variable speed motor 42 away from the motor casing.

In a preferred embodiment, the through hole 4211 of the first end cover 421 and the second end cover 422 are oppositely disposed, and the airflow introduced through the drainage device is through the through hole on the first end cover 421. 4211 flows into the motor casing and flows out of the motor casing from the through hole 4221 on the second end cover 422. In a more preferred embodiment, the first end cover 421 of the motor housing faces away from the fan volute 41, and the second end cover 422 of the motor housing faces the fan volute 41 into the motor The cold air within the outer casing can generally pass linearly through the windings of the variable speed motor 42 to increase the flow rate of air within the motor casing and enhance the cooling effect.

In the present embodiment, the variable speed fan 4 further includes a protective cover 45 which is disposed outside the motor casing and mainly functions to prevent dust introduced from the air entering from the air inlet passage 2 from falling into the motor. And the surface of the drainage device affects its performance. The protective cover 45 is provided with a plurality of through holes 451 which function mainly for the air to flow to the variable speed motor 42.

In a preferred embodiment, the balanced gas water heater may further include a heat dissipation fan 44 disposed between the variable speed motor 42 and the fan volute 41, and the heat dissipation fan 44 can flow through the winding The high temperature airflow is dissipated from the space between the variable speed motor 42 and the fan volute 41. On the one hand, the setting of the cooling fan can further increase the flow rate of the cold air in the motor casing, thereby increasing the cooling rate; on the other hand, the temperature rise of the high temperature air accumulated therein can be avoided.

In a preferred embodiment, the motor shaft of the variable speed motor 42 is perpendicular to the axis of the intake passage 2, so that cold air flowing out from the outlet of the intake passage 2 can be blown toward the motor and the fan worm The space between the shells blows off the high-temperature air flowing out of the variable speed motor 42 and accumulated therein to reduce the temperature rise of the high-temperature air to the motor.

In a preferred embodiment, the balanced gas water heater further includes a fan control unit 46 located outside the sealed chamber 11 to remove the fan control unit 46 from the interior of the variable speed motor 42 and place it in the sealed chamber 11 The external part can not only solve the problem of failure of the electronic components on the fan control device running in the high temperature sealed cavity for a long time, but also can prevent the fan control device 46 from blocking the airflow entering the internal variable speed motor 42 so that the air is drained. The device smoothly enters the variable speed motor 42 and passes through the winding to flow out of the variable speed motor 42. This formed a cooling "wind system."

In another embodiment, the balanced gas water heater further includes a Hall element for monitoring the variable speed motor 42 inside the variable speed motor 42, wherein the Hall element and the fan control device pass the wire Electrical connection. Retaining the Hall element inside the variable speed motor 42 is primarily to ensure the reliability of the variable speed fan speed monitoring.

In another embodiment, the axial fan 43 is disposed between the motor housing and the fan volute 41. Similar to the previous embodiment, the air introduced by the axial fan 43 enters the inside of the motor casing from the through hole 4211 in the first end cover 421 of the motor casing, and flows through the winding of the variable speed motor 42. Thereafter, it flows out from the through hole 4221 on the second end cover 422 of the motor casing.

In this embodiment, the through hole 4211 on the first end cover 421 and the through hole 4221 on the second end cover 422 may be 2, 3, 4 or even more to further increase the entry. The flow of air inside the motor casing increases the cooling effect.

In another embodiment, referring to FIG. 6, the intake passage 2 may be disposed opposite to the shifting motor 42, so that the cold air discharged from the outlet of the intake passage 2 is directly blown to the shifting motor 42, which is not only convenient. The drainage device performs drainage and can cool the motor.

In another embodiment, referring to Figure 6, the intake passage 2 and the exhaust passage 3 are at the top of the sealed chamber 11 and are offset from each other. In the present embodiment, the variable speed motor 42 is disposed opposite to the air outlet of the intake passage 2. The relative arrangement here means that the outlet of the intake duct is substantially opposite to the through hole on the motor casing, and the rotating shaft of the variable speed motor 42 is parallel to the exhaust passage 3, which can improve the flow of cold air through the motor. The rate increases the cooling effect.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments can be referred to each other.

The above embodiments are merely illustrative of the technical concept and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the present invention and to implement the present invention, and the scope of the present invention is not limited thereto. Equivalent variations or modifications made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

Claims

A balanced gas water heater includes:

Sealing chamber;

An intake passage and a smoke exhaust passage disposed on the sealed chamber;

a variable speed fan, a heat exchange device, and a combustion device disposed inside the sealed chamber;

The variable speed fan has a fan volute;

The intake passage is in communication with the combustion device and the heat exchange device, the heat exchange device is in communication with the fan volute inlet, and the fan volute outlet is connected to the exhaust passage;

The variable speed fan further includes: a drainage device and a variable speed motor disposed outside the volute of the fan, the variable speed motor including a winding, the drainage device capable of introducing at least a portion of the air entering the intake passage The variable speed motor passes through the windings.
A balanced gas water heater according to claim 1 wherein said variable speed motor includes a motor housing having a first end cap and a second end cap, said first end cap and said second end cap A through hole is opened, and the winding is disposed in the motor casing, and the airflow introduced by the drainage device can pass through the through holes in the first end cover and the second end cover.
A balanced gas water heater according to claim 2, wherein said first end cap and said second end cap are disposed opposite each other.
A balanced gas water heater according to claim 2 or 3, wherein the first end cover of the motor casing faces away from the fan volute, and the second end cover of the motor casing faces the fan Volute.
The balanced gas water heater according to claim 1, wherein the drainage device is an axial fan, and the axial fan is disposed between the motor casing and the fan volute.
A balanced gas water heater according to claim 1, wherein said flow guiding means is an axial flow fan, and said axial flow fan is disposed on a side of said variable speed motor facing away from said volute of said fan.
A balanced gas water heater according to claim 1 or 6, further comprising a heat dissipating fan disposed between said variable speed motor and said fan volute, said cooling fan being capable of flowing through said The airflow of the windings is dissipated from the space between the variable speed motor and the fan volute.
A balanced gas water heater according to claim 1, wherein said variable speed motor is provided at an outlet of said intake passage.
A balanced gas water heater according to claim 1, further comprising a fan control device disposed outside said sealed chamber.
A balanced gas water heater according to claim 9, wherein said variable speed fan comprises a Hall element electrically connected to said fan control means, said Hall element being disposed inside said motor casing .
A balanced gas water heater according to claim 1, wherein said intake passage surrounds said exhaust passage.
A balanced gas water heater according to claim 11, wherein said intake passage and said exhaust passage are coaxially disposed and located at the top of said sealed chamber.
A balanced gas water heater according to claim 1, wherein said intake passage and said exhaust passage are separately provided at the top of said sealed chamber.
A balanced gas water heater according to claim 1, wherein said variable speed fan comprises an impeller, said impeller being coupled to said variable speed motor via a motor shaft, said motor shaft and said axis of said intake passage Vertical.