Fans and gas water heaters using them

Abstract

The invention discloses a fan and a gas water heater using the fan, the fan comprising an isolation membrane and a base connected to the fan shaft, the base having an inner cavity, a vent being provided on the base, the isolation membrane being connected to the base and being used for shielding the vent, the isolation membrane dividing the inner cavity into a membrane cavity and an air inlet cavity, the membrane cavity being connected to the interior of the fan, the air inlet cavity being connected to the external atmosphere of the fan, the rotation of the fan shaft will drive the base to rotate, so as to form a pressure difference between the membrane cavity and the air inlet cavity and drive the isolation membrane to move in the inner cavity, the area of ​​the vent shielded by the isolation membrane changes, thereby changing the ventilation area of ​​the vent. Compared with the existing fan, the invention adopts the pressure difference generated inside and outside when the fan rotates as a driving force to drive the isolation membrane to move, and because the isolation membrane is light in weight, it can sensitively reflect the pressure difference change and quickly change the air inlet area of ​​the vent, thereby quickly adjusting the gas-air ratio and ensuring that the gas combustion process is stable and reliable.

Description

Technical Field

[0001] The invention relates to a fan and a gas water heater using the fan. Background Art

[0002] When a gas water heater is working, it has high requirements for the air-gas ratio. When the air intake is greater than the combustion load, the flame is easily blown out. When the air intake is less than the combustion load, CO is easily produced due to incomplete combustion.

[0003] Gas water heaters include fans for ventilation. The existing fan air inlet cannot be adjusted and is difficult to match with the extreme combustion load, resulting in incomplete combustion and low combustion efficiency when the external air pressure fluctuates. When the gas pressure is relatively low, if the fan still maintains a normal air supply, it is easy to cause flameout and the actual combustion temperature cannot reach the target temperature. In addition, the size of the air inlet of some fans can be adjusted manually in order to be compatible with other models or to match extreme working conditions. This adjustment method is cumbersome and has a poor user experience. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the fan air inlet of the gas water heater in the prior art cannot be automatically adjusted, resulting in the air-gas ratio cannot be adjusted, which in turn causes the gas water heater to have incomplete combustion or easy flameout.

[0005] In order to solve the above technical problems, the present invention provides a fan.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a fan, the fan includes an isolation membrane and a base connected to the fan shaft, the base has an inner cavity, a vent is opened on the base, the isolation membrane is connected to the base and is used to cover the vent, the isolation membrane divides the inner cavity into a membrane cavity and an air inlet cavity, the membrane cavity is connected to the interior of the fan, and the air inlet cavity is connected to the external atmosphere of the fan, the rotation of the fan shaft will drive the base to rotate, so as to form a pressure difference between the membrane cavity and the air inlet cavity and drive the isolation membrane to move in the inner cavity, the area of ​​the vent blocked by the isolation membrane changes, thereby changing the ventilation area of ​​the vent.

[0007] In this solution, the fan shaft rotates, and a pressure difference is formed inside and outside the fan. The external atmospheric pressure acts on the isolation membrane, and the isolation membrane moves under pressure in the inner cavity, changing the area of ​​the vent it blocks. The faster the fan speed, the greater the pressure difference between the inside and outside, the greater the distance the isolation membrane moves, and the smaller the area of ​​the vent it blocks. This achieves the function of increasing the ventilation area of ​​the fan as the pressure difference between the inside and outside of the fan increases.

[0008] Compared with the existing fans, the present invention adopts the pressure difference generated inside and outside the fan when it rotates as the driving force to drive the isolation membrane to move. First, due to the light weight of the isolation membrane, it can sensitively reflect the pressure difference change and quickly change the air inlet area of ​​the vent, so as to quickly adjust the gas-air ratio to ensure that the gas combustion process is stable and reliable; second, when the air volume needs to be increased, the fan speed increases and the air volume is increased. At the same time, the internal and external pressure difference increases. Due to the change in pressure difference, the air inlet area increases and the air volume is further increased. Therefore, compared with the existing fans, the present invention can add more air to the gas in unit time to avoid flameout due to sudden low pressure and hypoxia in the outside during gas combustion; third, the process of adjusting the air inlet of the present invention does not require an additional transmission mechanism, and the design of the isolation membrane makes the overall structure simple, light and low in energy consumption.

[0009] Preferably, the isolation membrane has a fixed part and a movable part, and the base also has a accommodating cavity, the accommodating cavity is connected to the inner cavity, the fixed part is fixedly connected in the accommodating cavity, the movable part moves in the inner cavity to cover the vent, and the movable part can move into the accommodating cavity.

[0010] In the present solution, the isolation membrane is installed in the inner cavity through the fixed part and the connection, and the movable part moves in the inner cavity to change the air inlet area of ​​the vent that it blocks. When the movable part is affected by the atmospheric pressure difference and is squeezed in the inner cavity, the movable part can smoothly enter the accommodating cavity. The accommodating cavity facilitates the retreat of the movable part, avoids the lack of elasticity caused by long-term deformation of the movable part, and prolongs the service life of the isolation membrane.

[0011] Preferably, the accommodating cavity extends radially outward along the inner cavity to form a storage space for accommodating the isolation membrane; a step is formed at the connection between the inner cavity and the accommodating cavity; or a bell mouth with a diameter increasing from thin to thick is formed at the connection between the inner cavity and the accommodating cavity.

[0012] In the present scheme, the accommodating cavity extends outward, which can provide a larger retreat space for the movable part of the isolation membrane, reduce the pressure on the movable part and cause its local folding, and avoid the difficulty in resetting the local isolation membrane; the connection between the inner cavity and the accommodating cavity has a step shape or a trumpet shape, which reduces the resistance of the movable part and is conducive to the smooth transition from the movable part to the accommodating cavity.

[0013] Preferably, the fixed portion of the isolation membrane extends outward along the radial direction of the membrane cavity, and the fixed portion includes an outer edge fixed edge and an inner edge movable band, the outer edge fixed edge and the inner edge movable band extend into the accommodating cavity together, the outer edge fixed edge is fixed on the inner wall of the accommodating cavity, and the inner edge movable band can move freely relative to the inner wall of the accommodating cavity.

[0014] In the present solution, the outer fixing edge of the fixed part extends outward and is connected to the accommodating cavity, and the inner edge movable belt of the fixed part can move freely in the accommodating cavity. With this design, a movable space is formed between the inner edge movable belt and the inner wall of the accommodating cavity. The movable part is affected by the pressure difference, and one end of the movable part can naturally enter the movable space. The end of the movable part close to the accommodating cavity has a greater degree of freedom, so as to extend the service life of the end of the movable part that is often deformed.

[0015] Preferably, the fan further comprises a driving coil and a permanent magnet, wherein the permanent magnet is on the isolation membrane, and the driving coil drives the permanent magnet to move in the inner cavity through magnetic force.

[0016] In this solution, the driving coil is energized to generate a magnetic field with variable direction and size to control the permanent magnet to drive the isolation membrane to move, thereby adding a control method to actively adjust the movement state of the isolation membrane. Compared with the passive adjustment method using pressure difference, the active adjustment method is obviously more convenient and has better adjustability. It can further accurately control the isolation membrane to enable the fan to adapt to different external environments.

[0017] Preferably, the fan further comprises a distance measuring probe, wherein the distance measuring probe is arranged opposite to the permanent magnet to detect the movement of the permanent magnet and the degree of compression of the isolation membrane.

[0018] In this solution, the distance measuring probe is used to detect the distance between the permanent magnet and the distance measuring probe, so as to determine the movement amount of the isolation membrane and further determine the air inlet area of ​​the fan vent.

[0019] Preferably, the fan also includes a pre-tensioning spring, which is arranged in the membrane cavity, one end of the pre-tensioning spring abuts against the inner wall of the membrane cavity, and the other end abuts against or is connected to the inner wall of the base to push the isolation membrane to reset axially along the inner cavity of the base.

[0020] In this solution, a pre-tightening spring is provided in the membrane cavity, so that the isolation membrane can be reset more easily, thereby avoiding local folding, which would make it difficult to reset.

[0021] Preferably, the outer side of the preload spring can also abut against the inner wall of the membrane cavity, so that the side wall of the membrane cavity is in close contact with the wall of the inner cavity of the base to block part or all of the ventilation opening.

[0022] In this solution, the outer side of the preload spring supports the membrane cavity, so that the isolation membrane blocks the air vent on the inner cavity with better sealing performance.

[0023] Preferably, the fan also includes a fan body and a cover plate, the cover plate is connected to the fan body, the base is located inside the cover plate, an air inlet is provided on the cover plate, the base extends into the air inlet and can rotate inside the air inlet, and the air inlet cavity is communicated with the air inlet.

[0024] In this solution, the function of the cover is to wrap and protect the base, preventing air dust from directly entering the outside of the base, reducing the amount of dust accumulated on the isolation membrane, thereby extending its service life. In addition, the base can be rotated and the cover wraps it to protect the users.

[0025] The present invention also provides a gas water heater, which comprises the above-mentioned fan.

[0026] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0027] The positive and progressive effects of the present invention are as follows: compared with the existing fans, the present invention adopts the pressure difference generated inside and outside the fan when the fan rotates as the driving force to drive the isolation membrane to move. First, since the isolation membrane is light in weight, it can sensitively reflect the pressure difference change and quickly change the air inlet area of ​​the vent, so that the gas-air ratio can be quickly adjusted to ensure that the gas combustion process is stable and reliable; second, when the air volume needs to be increased, the fan speed increases and the air volume is increased. At the same time, the internal and external pressure difference increases. Due to the change in pressure difference, the air inlet area increases and the air volume is further increased. Therefore, compared with the existing fans, the present invention can add more air to the gas in unit time to avoid flameout due to sudden low pressure and hypoxia in the outside during gas combustion; third, the process of adjusting the air inlet of the present invention does not require an additional transmission mechanism, and the design of the isolation membrane makes the overall structure simple, light and energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial cross-sectional view of the base in the present invention.

[0029] Figure 2 It is a structural schematic diagram of the base in the present invention.

[0030] Figure 3 for Figure 2 Schematic diagram of the structure on the back of the middle base.

[0031] Figure 4 It is a structural schematic diagram of the base installed on the cover plate in the present invention.

[0032] Figure 5 It is a schematic diagram of the structure in which the base is located inside the cover plate in the present invention.

[0033] Description of reference numerals:

[0034] Isolation film 10

[0035] Base 11

[0036] Inner cavity 12

[0037] Vent 13

[0038] Membrane cavity 14

[0039] Air inlet cavity 15

[0040] Fixing portion 16

[0041] Activities Department 17

[0042] Accommodating chamber 18

[0043] Outer edge fixed edge 21

[0044] Inner edge active belt 22

[0045] Driving coil 23

[0046] Permanent magnet 24

[0047] Distance measuring probe 25

[0048] Preload spring 26

[0049] Cover 28

[0050] Air Inlet 29

[0051] Port 30

[0052] Side port 31 DETAILED DESCRIPTION

[0053] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0054] Figure 1-Figure 5 What is shown is an embodiment of a fan of the present invention. The fan includes an isolation membrane 10 and a base 11 connected to the fan shaft. The base 11 has an inner cavity 12. A vent 13 is opened on the base 11. The isolation membrane 10 is connected to the base 11 and is used to block the vent 13. The isolation membrane 10 divides the inner cavity 12 into a membrane cavity 14 and an air inlet cavity 15. The membrane cavity 14 is connected to the interior of the fan, and the air inlet cavity 15 is connected to the external atmosphere of the fan. The rotation of the fan shaft will drive the base 11 to rotate, so that a pressure difference is formed between the membrane cavity 14 and the air inlet cavity 15 and drive the isolation membrane 10 to move in the inner cavity 12. The area of ​​the vent 13 blocked by the isolation membrane 10 changes, thereby changing the ventilation area of ​​the vent 13.

[0055] In this example, when the fan is working, its shaft rotates, and a pressure difference is formed inside and outside the fan. The external atmospheric pressure acts on the isolation membrane 10, and the isolation membrane 10 moves under pressure in the inner cavity 12, changing the area of ​​the ventilation opening 13 it blocks. The faster the fan speed, the greater the pressure difference between the inside and outside, the greater the distance the isolation membrane 10 moves, and the smaller the area of ​​the ventilation opening 13 it blocks. This achieves the function of increasing the ventilation area of ​​the fan as the pressure difference between the inside and outside of the fan increases.

[0056] Compared with the existing fans, the present invention uses the pressure difference generated inside and outside the fan when it rotates as the driving force to drive the isolation membrane 10 to move. First, since the isolation membrane 10 is light in weight, it can sensitively reflect the pressure difference change and quickly change the air inlet area of ​​the vent 13, so that the gas-air ratio can be quickly adjusted to ensure that the gas combustion process is stable and reliable; second, when the air volume needs to be increased, the fan speed increases and the air volume is increased. At the same time, the internal and external pressure difference increases. Due to the change in pressure difference, the air inlet area increases and the air volume is further increased. Therefore, compared with the existing fans, the present invention can add more air to the gas in unit time to avoid flameout due to sudden low pressure and hypoxia in the outside during gas combustion; third, the process of adjusting the air inlet 29 of the present invention does not require an additional transmission mechanism, and the design of the isolation membrane 10 makes the overall structure simple, light and energy-saving.

[0057] like Figure 1 As shown, in other embodiments, the base 11 includes a box body and a chassis, the chassis is connected to the fan shaft, and a wind pressure port is opened on the chassis to connect the inside of the fan and the membrane cavity 14, thereby facilitating the transfer of the internal air pressure of the fan to the membrane cavity 14.

[0058] like Figure 2 As shown, in other embodiments, the vent 13 includes a port 30 and a side port 31 provided on the base 11, the port 30 is opened at the end of the base 11 close to the air inlet chamber 15, and the side port 31 is opened on the side wall of the base 11, and the isolation membrane 10 can block part or all of the side port 31 to change the air inlet area of ​​the fan.

[0059] like Figure 1 As shown, preferably, the isolation membrane 10 has a fixed part 16 and a movable part 17, and the base 11 also has a accommodating cavity 18, which is connected to the inner cavity 12, the fixed part 16 is fixedly connected in the accommodating cavity 18, and the movable part 17 moves in the inner cavity 12 to cover the vent 13, and the movable part 17 can move into the accommodating cavity 18.

[0060] In this example, the isolation membrane 10 is installed in the inner cavity 12 through the fixing portion 16 and the connection. The movable portion 17 moves in the inner cavity 12 to change the air inlet area of ​​the vent 13 that is blocked. When the movable portion 17 is affected by the atmospheric pressure difference and is squeezed in the inner cavity 12, the movable portion 17 can smoothly enter the accommodating cavity 18. The accommodating cavity 18 facilitates the retreat of the movable portion 17, avoids the lack of elasticity caused by long-term deformation of the movable portion 17, and extends the service life of the isolation membrane 10.

[0061] Preferably, the accommodating cavity 18 extends radially outwardly from the inner cavity 12 to form a storage space for accommodating the isolation membrane 10; a step is formed at the connection between the inner cavity 12 and the accommodating cavity 18 ( Figure 1 or, the connection between the inner cavity 12 and the accommodating cavity 18 forms a bell mouth with a diameter from thin to thick.

[0062] In this example, the accommodating cavity 18 extends outward, which can provide a larger retreat space for the movable part 17 of the isolation membrane 10, reduce the pressure on the movable part 17 and cause it to be partially folded, and avoid the isolation membrane 10 being difficult to reposition locally; the connection between the inner cavity 12 and the accommodating cavity 18 has a step shape or a trumpet shape, which reduces the resistance of the movable part 17 and is conducive to the smooth transition from the movable part 17 to the accommodating cavity 18.

[0063] Preferably, the fixed portion 16 of the isolation membrane 10 extends outward in the radial direction of the membrane cavity 14, and the fixed portion 16 includes an outer edge fixed edge 21 and an inner edge movable band 22. The outer edge fixed edge 21 and the inner edge movable band 22 extend into the accommodating cavity 18 together, and the outer edge fixed edge 21 is fixed on the inner wall of the accommodating cavity 18, and the inner edge movable band 22 can move freely relative to the inner wall of the accommodating cavity 18.

[0064] like Figure 1 As shown, in this example, the outer fixing edge of the fixing portion 16 extends outward and is connected to the accommodating cavity 18, and the inner edge movable band 22 of the fixing portion 16 can move freely in the accommodating cavity 18. With this design, a movable space is formed between the inner edge movable band 22 and the inner wall of the accommodating cavity 18. The movable portion 17 is affected by the pressure difference, and one end of the movable portion 17 can naturally enter the movable space. The end of the movable portion 17 close to the accommodating cavity 18 has a greater degree of freedom, so as to extend the service life of the end of the movable portion 17 that is often deformed.

[0065] like Figure 1 and Figure 4 As shown, preferably, the fan further includes a driving coil 23 and a permanent magnet 24 . The permanent magnet 24 is on the isolation membrane 10 . The driving coil 23 pushes the permanent magnet 24 to move in the inner cavity 12 through magnetic force.

[0066] In this example, the driving coil 23 is energized to generate a magnetic field whose direction and size can be changed, so as to control the permanent magnet 24 to drive the isolation membrane 10 to move, thereby adding a control method for actively adjusting the movement state of the isolation membrane 10. Compared with the passive adjustment method using pressure difference, the active adjustment method is obviously more convenient and has better adjustability, and can further accurately control the isolation membrane 10 so that the fan can adapt to different external environments.

[0067] like Figure 2 As shown, preferably, the fan further includes a distance measuring probe 25 , which is arranged opposite to the permanent magnet 24 to detect the movement of the permanent magnet 24 and the degree of compression of the isolation membrane 10 .

[0068] In this example, the distance measuring probe 25 is used to detect the distance between the permanent magnet 24 and the distance measuring probe 25 , so as to determine the movement amount of the isolation membrane 10 , and further determine the air inlet area of ​​the fan vent 13 .

[0069] like Figure 1 As shown, preferably, the fan also includes a pre-tensioning spring 26, which is arranged in the membrane cavity 14, one end of the pre-tensioning spring 26 abuts against the inner wall of the membrane cavity 14, and the other end abuts against or is connected to the inner wall of the base 11 to push the isolation membrane 10 to reset axially along the inner cavity 12 of the base 11.

[0070] In this example, by providing a preload spring 26 in the membrane cavity 14, the isolation membrane 10 is made easier to reset, thereby preventing the isolation membrane 10 from being partially folded, which would make it difficult to reset.

[0071] like Figure 1 As shown, preferably, the outer side of the preload spring 26 can also abut against the inner wall of the membrane cavity 14 , so that the side wall of the membrane cavity 14 is in close contact with the wall of the inner cavity 12 of the base 11 to block part or all of the ventilation openings 13 .

[0072] In this example, the outer side of the preload spring 26 props up the membrane cavity 14 , so that the isolation membrane 10 can better seal the vent 13 on the inner cavity 12 .

[0073] like Figure 4 and Figure 5 Preferably, the fan also includes a fan body and a cover plate 28, the cover plate 28 is connected to the fan body, the cover plate 28 has a groove, the base 11 is located in the groove of the cover plate 28, an air inlet 29 is opened on the cover plate 28, the base 11 extends into the air inlet 29 and can rotate in the air inlet 29, the air inlet cavity 15 is connected to the air inlet 29, specifically, one end of the base 11 having a port 30 is embedded in the air inlet 29, the port 30 is exposed to the outside, and the atmosphere is directly connected to the air inlet cavity 15 through the port 30.

[0074] In this example, the cover 28 serves to wrap and protect the base 11, preventing air dust from directly entering the outside of the base 11, reducing the amount of dust accumulated on the isolation membrane 10, and thus extending its service life. In addition, the base 11 is rotatable, and the cover 28 wraps it to protect the user.

[0075] The present invention also provides a gas water heater, which comprises the above-mentioned fan.

[0076] In this embodiment, the fan is applied to the gas water heater. The air intake volume of the gas water heater can be adjusted by the fan. Compared with the existing gas water heater, more air can be added to the gas water heater per unit time to avoid flameout due to sudden low pressure and hypoxia in the outside world during gas combustion, and to avoid flameout of the gas water heater due to sudden excessive air volume in the outside world.

[0077] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fan, characterized in that: The fan comprises an isolation membrane and a base connected to the fan shaft, the base having an inner cavity, a vent opening being provided on the base, the isolation membrane being connected to the base and being used to cover the vent opening, the isolation membrane dividing the inner cavity into a membrane cavity and an air inlet cavity, the membrane cavity being communicated with the interior of the fan, the air inlet cavity being communicated with the external atmosphere of the fan, the rotation of the fan shaft will drive the base to rotate, so as to form a pressure difference between the membrane cavity and the air inlet cavity and drive the isolation membrane to move in the inner cavity, the area of ​​the vent opening covered by the isolation membrane changes, thereby changing the ventilation area of ​​the vent opening; The isolation membrane has a fixed part and a movable part, and the base also has a accommodating cavity, which is connected to the inner cavity. The fixed part is fixedly connected in the accommodating cavity, and the movable part moves in the inner cavity to cover the vent, and the movable part can be moved into the accommodating cavity.

2. The fan according to claim 1, characterized in that: The accommodating cavity extends radially outwardly along the inner cavity to form a storage space for accommodating the isolation membrane; A step is formed at the connection between the inner cavity and the accommodating cavity; Alternatively, a bell mouth with a diameter increasing from thin to thick is formed at the connection between the inner cavity and the accommodating cavity.

3. The fan according to claim 2, characterized in that: The fixed portion of the isolation membrane extends outward along the radial direction of the membrane cavity, and the fixed portion includes an outer edge fixed edge and an inner edge movable band. The outer edge fixed edge and the inner edge movable band extend into the accommodating cavity together, and the outer edge fixed edge is fixed on the inner wall of the accommodating cavity, and the inner edge movable band can move freely relative to the inner wall of the accommodating cavity.

4. The fan according to claim 1, characterized in that: The fan further includes a driving coil and a permanent magnet. The permanent magnet is on the isolation membrane. The driving coil drives the permanent magnet to move in the inner cavity through magnetic force.

5. The fan according to claim 4, characterized in that: The fan further comprises a distance measuring probe, which is arranged opposite to the permanent magnet to detect the movement of the permanent magnet and the degree of compression of the isolation membrane.

6. The fan according to claim 1, characterized in that: The fan also includes a pre-tensioning spring, which is arranged in the membrane cavity. One end of the pre-tensioning spring abuts against the inner wall of the membrane cavity, and the other end abuts against or is connected to the inner wall of the base to push the isolation membrane to reset axially along the inner cavity of the base.

7. The fan according to claim 6, characterized in that: The outer side of the preload spring can also abut against the inner wall of the membrane cavity, so that the side wall of the membrane cavity is in close contact with the wall of the inner cavity of the base to block part or all of the ventilation opening.

8. The fan according to claim 1, characterized in that: The fan also includes a fan body and a cover plate, the cover plate is connected to the fan body, the base is located in the cover plate, an air inlet is opened on the cover plate, the base extends into the air inlet and can rotate in the air inlet, and the air inlet cavity is communicated with the air inlet.

9. A gas water heater, characterized in that: It comprises a fan as claimed in any one of claims 1 to 8.

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