Smoke exhaust pipe and gas water heater comprising same

Abstract

The utility model provides a smoke exhaust pipe and a gas water heater comprising the same. The smoke exhaust pipe comprises a smoke exhaust pipe body, a first magnetic ring, a second magnetic ring and a magnetic suction ring. A first-stage smoke exhaust hole and a second-stage smoke exhaust hole which are formed in the axial direction of the smoke exhaust pipe body at intervals are formed in the air outlet end of the smoke exhaust pipe body, the first magnetic ring and the second magnetic ring are permanent magnets with different magnetism and temperature corresponding relations and are fixed to the two sides of the second-stage smoke exhaust hole respectively, and the magnetic attraction ring is arranged between the first magnetic ring and the second magnetic ring. The magnetic attraction ring can move relative to the smoke exhaust pipe body in the axial direction of the smoke exhaust pipe body according to the change of the magnetic attraction force of the first magnetic ring relative to the second magnetic ring. When the temperature of the first magnetic ring and the temperature of the second magnetic ring are lower than the preset temperature, the magnetic suction ring is close to the first magnetic ring to block the second-stage smoke exhaust hole; and when the temperature of the first magnetic ring and the second magnetic ring is higher than the preset temperature, the magnetic suction ring gets close to the second magnetic ring to open the second-stage smoke exhaust hole. According to the smoke exhaust pipe, the gas water heater using the smoke exhaust pipe can be normally started in a low-temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a flue pipe and a gas water heater containing the same. Background Technology

[0002] In northern regions during winter, when using gas water heaters, the water vapor in the flue gas discharged from the exhaust pipe is easily condensed and accumulated around the exhaust port of the flue pipe due to the influence of strong cold air from the outside. This can cause the exhaust pipe to become blocked, preventing the gas water heater from starting properly and creating safety hazards. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defect in the prior art where water vapor in the flue gas freezes and blocks the flue gas vent due to the influence of cold air, causing the water heater to fail to start. This utility model provides a flue pipe and a gas water heater containing the flue pipe.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A smoke exhaust pipe includes a pipe body having a primary smoke exhaust port, and the smoke exhaust pipe further includes:

[0006] A secondary smoke exhaust port, wherein the primary smoke exhaust port and the secondary smoke exhaust port are spaced apart along the axial direction of the smoke exhaust pipe body at the air outlet end of the smoke exhaust pipe body;

[0007] The first magnetic ring and the second magnetic ring are permanent magnets with different magnetic properties and temperature relationships. The first magnetic ring and the second magnetic ring are respectively fixed on both sides of the secondary smoke exhaust hole.

[0008] A magnetic ring is disposed between the first magnetic ring and the second magnetic ring. The magnetic ring is capable of moving relative to the exhaust pipe body along the axial direction of the exhaust pipe body according to the change of the magnetic attraction force of the first magnetic ring relative to the second magnetic ring.

[0009] When the temperature of the first magnetic ring and the second magnetic ring is lower than the preset temperature, the magnetic ring moves closer to the first magnetic ring to block the secondary smoke exhaust hole; when the temperature of the first magnetic ring and the second magnetic ring is higher than the preset temperature, the magnetic ring moves closer to the second magnetic ring to open the secondary smoke exhaust hole.

[0010] In this technical solution, a secondary exhaust port is opened on the exhaust pipe body, and a first magnetic ring and a second magnetic ring are set on both sides of the secondary exhaust port. The magnetic attraction force generated by the first magnetic ring and the second magnetic ring when the temperature of the exhaust pipe body changes drives the magnetic attraction ring to block and open the secondary exhaust port. This allows the secondary exhaust port to be opened to discharge flue gas when the primary exhaust pipe is blocked by ice, thereby preventing the water heater using the exhaust pipe from failing to start due to the blockage of the primary exhaust port.

[0011] Specifically, when the water heater is working normally, the flue gas is discharged normally from the primary exhaust port. The temperature of the first and second magnetic rings is lower than the preset temperature. At this time, the magnetic attraction of the first magnetic ring is stronger than that of the second magnetic ring. The magnetic ring moves closer to the first magnetic ring and blocks the secondary exhaust port. In other words, when the water heater is working normally, the primary exhaust port is unobstructed, while the secondary exhaust port is blocked by the magnetic ring. When the outside temperature is too low, causing the water vapor in the primary exhaust port to freeze and block the primary exhaust port with ice, the flue gas will quickly accumulate in the exhaust pipe body before the secondary exhaust port opens. This causes the temperature of the exhaust pipe body to rise rapidly. The first and second magnetic rings fixed to the exhaust pipe body will also quickly heat up to a temperature higher than the preset temperature. At this time, the magnetic attraction of the second magnetic ring is stronger than that of the first magnetic ring. The magnetic ring moves closer to the second magnetic ring and opens the secondary exhaust port, allowing the flue gas to be discharged from the secondary exhaust pipe, thus preventing the water heater from failing to start due to the blockage of the primary exhaust port.

[0012] Preferably, the magnetism of the first magnetic ring disappears when the temperature of the first magnetic ring is higher than a preset temperature.

[0013] In this technical solution, the first magnetic ring is set to disappear when the temperature is higher than the preset temperature, ensuring that the magnetic ring can respond quickly after the flue gas accumulates and the exhaust pipe heats up, opening the secondary exhaust hole and avoiding the source of the flue gas from stopping combustion due to poor exhaust.

[0014] Preferably, along the axial direction of the exhaust pipe body, the size of the magnetic ring is larger than the size of the secondary exhaust hole.

[0015] In this technical solution, the size of the magnetic ring is set to be larger than the size of the secondary smoke exhaust hole, so that the magnetic ring can seal the secondary smoke exhaust hole more tightly.

[0016] Preferably, along the axial direction of the exhaust pipe body, the distance between the second magnetic ring and the secondary exhaust hole is greater than the size of the magnetic ring.

[0017] In this technical solution, by setting the distance between the second magnetic ring and the secondary smoke exhaust hole to be greater than the size of the magnetic ring, there is sufficient space between the second magnetic ring and the secondary smoke exhaust hole, ensuring that the secondary smoke exhaust hole can smoothly discharge smoke when the magnetic ring approaches the second magnetic ring.

[0018] Preferably, the area of ​​the secondary smoke exhaust hole is smaller than the area of ​​the primary smoke exhaust hole.

[0019] In this technical solution, by setting the area of ​​the secondary exhaust port to be smaller than that of the primary exhaust port, the primary exhaust port is blocked by ice, and after the secondary exhaust port is opened, the temperature of the exhaust pipe body is still maintained at a temperature higher than the preset temperature, so that the ice in the primary exhaust port gradually melts, thereby restoring the water heater to normal working condition.

[0020] Preferably, the area of ​​the primary smoke exhaust hole is more than twice the area of ​​the secondary smoke exhaust hole.

[0021] In this technical solution, by setting the area of ​​the primary exhaust port to be twice the area of ​​the secondary exhaust port, that is, the area of ​​the primary exhaust port is much larger than the area of ​​the secondary exhaust port, the smoke in the exhaust pipe accumulates faster when the primary exhaust port is blocked by ice, the temperature rise of the exhaust pipe is more obvious, and thus the ice melts faster, so that the exhaust pipe can be restored to normal working condition as soon as possible.

[0022] Preferably, the magnetic ring is a metal ring.

[0023] In this technical solution, the magnetic ring is made of metal, which facilitates processing and manufacturing.

[0024] Preferably, the primary smoke exhaust hole is located outside the movement path of the magnetic ring.

[0025] In this technical solution, by setting the primary smoke exhaust hole outside the movement path of the magnetic ring, the primary smoke exhaust hole is prevented from being blocked by the magnetic ring, thus affecting smoke exhaust.

[0026] Preferably, the inner circumferential side of the magnetic ring is in contact with the outer circumferential side of the exhaust pipe body.

[0027] In this technical solution, by setting the inner circumference of the magnetic ring to fit against the outer circumference of the exhaust pipe body, the airtightness of the magnetic ring when sealing the secondary exhaust hole can be enhanced.

[0028] Preferably, the secondary exhaust port includes a plurality of strip-shaped through holes extending circumferentially along the exhaust pipe body.

[0029] In this technical solution, by setting the secondary exhaust holes as several through holes extending circumferentially along the exhaust pipe body, it is possible to cover a larger exhaust area with a narrower axial width while ensuring the structural strength of the exhaust pipe.

[0030] A water heater comprising a flue pipe as described above.

[0031] By installing the exhaust pipe as described above in the water heater, the water heater can still start normally even after the primary exhaust port of the exhaust pipe is blocked by ice.

[0032] The positive and progressive effects of this utility model are as follows: by opening a secondary exhaust port on the exhaust pipe body, and setting a first magnetic ring and a second magnetic ring on both sides of the secondary exhaust port, the magnetic attraction force generated by the first magnetic ring and the second magnetic ring when the temperature of the exhaust pipe body changes, drives the magnetic attraction ring to block and open the secondary exhaust port. This allows the secondary exhaust port to be opened to discharge flue gas when the primary exhaust pipe is blocked by ice, thereby preventing the water heater using this exhaust pipe from failing to start due to the blockage of the primary exhaust port. Attached Figure Description

[0033] Figure 1 This is a cross-sectional structural diagram of the exhaust pipe of an embodiment of the present invention when it is not frozen.

[0034] Figure 2 This is a cross-sectional structural diagram of the exhaust pipe when it is frozen according to an embodiment of the present invention.

[0035] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle.

[0036] Figure 4 This is a cross-sectional structural diagram of a gas water heater according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100mm exhaust pipe

[0039] Smoke exhaust pipe body 1

[0040] Primary smoke exhaust port 11

[0041] 12 secondary smoke exhaust holes

[0042] 13 air outlet

[0043] First magnetic ring 2

[0044] Second magnetic ring 3

[0045] Magnetic ring 4

[0046] Gas water heater 200 Detailed Implementation

[0047] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0048] like Figures 1-3As shown, this embodiment provides a smoke exhaust pipe 100, which includes a smoke exhaust pipe body 1 with a primary smoke exhaust port 11, a secondary smoke exhaust port 12, a first magnetic ring 2, a second magnetic ring 3, and a magnetic attraction ring 4. The primary smoke exhaust port 11 and the secondary smoke exhaust port 12 are spaced apart along the axial direction of the smoke exhaust pipe body 1 at the air outlet 13 of the smoke exhaust pipe body 1. The first magnetic ring 2 and the second magnetic ring 3 are permanent magnets with different magnetic properties relative to temperature, and are respectively fixed on both sides of the secondary smoke exhaust port 12. The magnetic attraction ring 4 is disposed between the first magnetic ring 2 and the second magnetic ring 3, and can move relative to the smoke exhaust pipe body 1 along the axial direction of the smoke exhaust pipe body 1 according to the change in the magnetic attraction force of the first magnetic ring 2 relative to the second magnetic ring 3. It should be noted that the first magnetic ring 2 and the second magnetic ring 3 are permanent magnets with different magnetic properties relative to temperature, meaning that the magnetic properties of the first magnetic ring 2 change with temperature differently than those of the second magnetic ring 3.

[0049] When the temperature of the first magnetic ring 2 and the second magnetic ring 3 is lower than the preset temperature, the magnetic ring 4 moves closer to the first magnetic ring 2 to block the secondary smoke exhaust hole 12; when the temperature of the first magnetic ring 2 and the second magnetic ring 3 is higher than the preset temperature, the magnetic ring 4 moves closer to the second magnetic ring 3 to open the secondary smoke exhaust hole 12. In other words, when the temperature is lower than the preset temperature, the first magnetic ring 2 has a stronger magnetism and a greater magnetic attraction force on the magnetic ring 4; when the temperature is higher than the preset temperature, the second magnetic ring 3 has a stronger magnetism and a greater magnetic attraction force on the magnetic ring 4.

[0050] In this way, by opening a secondary exhaust port 12 on the exhaust pipe body 1, and setting a first magnetic ring 2 and a second magnetic ring 3 on both sides of the secondary exhaust port 12, the magnetic attraction force of the first magnetic ring 2 and the second magnetic ring 3 on the magnetic attraction ring 4 changes when the temperature of the exhaust pipe body 1 changes, driving the magnetic attraction ring 4 to block and open the secondary exhaust port 12. This allows the secondary exhaust port 12 to be opened to discharge flue gas when the primary exhaust pipe 100 is blocked by ice, thereby preventing the water heater using the exhaust pipe 100 from failing to start due to the blockage of the primary exhaust port 11.

[0051] The primary smoke exhaust port 11 mentioned in this embodiment is the smoke exhaust port of the smoke exhaust pipe 100 in the prior art.

[0052] Specifically, such as Figure 1As shown, the initial position of the magnetic ring 4 is located near the first magnetic ring 2, blocking the secondary exhaust port 12. When the water heater is working normally, the flue gas is discharged normally from the primary exhaust port 11. The temperature of the first magnetic ring 2 and the second magnetic ring 3 is lower than the preset temperature. At this time, the magnetic attraction of the first magnetic ring 2 is greater than that of the second magnetic ring 3. The magnetic ring 4 approaches the first magnetic ring 2 and blocks the secondary exhaust port 12. That is to say, when the water heater is working normally, the primary exhaust port 11 is unobstructed, and the secondary exhaust port 12 is blocked by the magnetic ring 4. When the outside temperature is too low, causing the water vapor in the primary exhaust port 11 to freeze and block the primary exhaust port 11 with ice, the flue gas will quickly accumulate in the exhaust pipe body 1 before the secondary exhaust port 12 opens, causing the temperature of the exhaust pipe body 1 to rise rapidly. The first magnetic ring 2 and the second magnetic ring 3 fixed on the exhaust pipe body 1 will also quickly heat up to a temperature higher than the preset temperature. At this time, the magnetic attraction of the second magnetic ring 3 is greater than that of the first magnetic ring 2. Figure 2 As shown, the magnetic ring approaches the second magnetic ring 3 and opens the secondary exhaust port 12, allowing the flue gas to be discharged from the secondary exhaust pipe 100, thus preventing the water heater from failing to start due to blockage of the primary exhaust port 11.

[0053] Specifically, in this embodiment, the Curie temperatures of the first magnetic ring 2 and the second magnetic ring 3 are different. The Curie temperature of the first magnetic ring 2 is lower than that of the second magnetic ring 3, and the Curie temperature of the second magnetic ring 3 is higher than a preset temperature. The magnetism of the second magnetic ring 3 remains relatively stable in high-temperature environments above the preset temperature. When the temperature is lower than the Curie temperature of the first magnetic ring 2, the magnetism of the first magnetic ring 2 is greater than that of the second magnetic ring 3. When the temperature is higher than the Curie temperature of the first magnetic ring 2, the magnetization of the first magnetic ring 2 is 0, and the first magnetic ring 2 loses its magnetism. At this time, the second magnetic ring 3 still possesses magnetism.

[0054] When the magnetic ring 4 approaches the first magnetic ring 2 or the second magnetic ring 3, it can either block or open the secondary smoke exhaust hole 12. This is achieved by setting different distances between the first magnetic ring 2 and the second magnetic ring 3 and the secondary smoke exhaust hole 12. Specifically, for example... Figure 1 and Figure 2 As shown, the distance from the first magnetic ring 2 to the secondary smoke exhaust hole 12 is less than the distance from the second magnetic ring 3 to the secondary smoke exhaust hole 12. In other words, because the distance between the first magnetic ring 2 and the secondary smoke exhaust hole 12 is smaller, there is insufficient space between them to accommodate the magnetic ring 4. Therefore, when the magnetic ring 4 approaches the first magnetic ring 2, it can be positioned at the secondary smoke exhaust hole 12 and block it. Conversely, the distance between the second magnetic ring 3 and the secondary smoke exhaust hole 12 is larger, providing sufficient space for the magnetic ring 4. Therefore, when the magnetic ring 4 approaches the second magnetic ring 3, it can be positioned between the second magnetic ring 3 and the secondary smoke exhaust hole 12, without blocking it, thus allowing the secondary smoke exhaust hole 12 to be opened.

[0055] In this embodiment, the magnetism of the first magnetic ring 2 disappears when its temperature exceeds a preset temperature. That is, the Curie temperature of the first magnetic ring 2 in this embodiment is equal to the preset temperature. By setting the first magnetic ring 2 so that its magnetism disappears when its temperature exceeds the preset temperature, the magnetic ring 4 can respond quickly to the rising temperature of the exhaust pipe 100 caused by flue gas accumulation, opening the secondary exhaust port 12 and preventing the water heater using the exhaust pipe 100 from stopping combustion due to poor exhaust.

[0056] Of course, in other embodiments, the Curie temperature of the first magnetic ring 2 can also be lower than the preset temperature. This also achieves the goal that when the temperatures of the first magnetic ring 2 and the second magnetic ring 3 are higher than the preset temperature, the magnetism of the first magnetic ring 2 disappears, and the magnetic ring 4 approaches the second magnetic ring 3 and blocks the secondary exhaust port 12. In more embodiments, other first magnetic rings 2 and 3 that meet the magnetic requirements can also be provided. That is, when the temperature is lower than the preset temperature, the magnetism of the first magnetic ring 2 is greater than that of the second magnetic ring 3, and when the temperature is higher than the preset temperature, the magnetism of the first magnetic ring 2 is less than that of the second magnetic ring 3. Further details will not be elaborated here.

[0057] In this embodiment, the preset temperature is determined based on the temperature of the exhaust pipe body 1 when it is normally exhausting smoke through the first-stage exhaust hole 11, and the first magnetic ring 2 and the second magnetic ring 3 with suitable Curie temperatures are found.

[0058] In this embodiment, as Figure 3 As shown, along the axial direction of the exhaust pipe body 1, the distance c between the second magnetic ring 3 and the secondary exhaust hole 12 is greater than the size a of the magnetic ring 4, i.e., c > a, and the distance d between the first magnetic ring 2 and the secondary exhaust hole 12 is less than the size a of the magnetic ring 4, i.e., d < a. As mentioned earlier, sufficient space is needed between the second magnetic ring 3 and the secondary exhaust hole 12 to fully accommodate the magnetic ring 4 so that the secondary exhaust hole 12 can be fully opened. By setting the distance c between the second magnetic ring 3 and the secondary exhaust hole 12 to be greater than the size a of the magnetic ring 4, sufficient space is provided between the second magnetic ring 3 and the secondary exhaust hole 12 to ensure that the secondary exhaust hole 12 can smoothly exhaust smoke when the magnetic ring 4 is close to the second magnetic ring 3.

[0059] Of course, in other embodiments, the distance between the second magnetic ring 3 and the secondary smoke exhaust hole 12 is equal to the size of the magnetic ring 4, which can also achieve the effect of fully opening the secondary smoke exhaust hole 12. When the magnetic ring 4 and the second magnetic ring 3 are in contact, the secondary smoke exhaust hole 12 can be fully opened. In more embodiments, the distance between the second magnetic ring 3 and the secondary smoke exhaust hole 12 is less than the size of the magnetic ring 4, which can also open the secondary smoke exhaust hole 12. However, in this case, the magnetic ring 4 will still partially block the secondary smoke exhaust hole 12, and the effect of fully opening the secondary smoke exhaust hole 12 cannot be achieved.

[0060] In this embodiment, along the axial direction of the exhaust pipe body 1, the size a of the magnetic ring 4 is larger than the size b of the secondary exhaust hole 12, i.e., a > b. By setting the size a of the magnetic ring 4 to be larger than the size b of the secondary exhaust hole 12, the magnetic ring 4 can seal the secondary exhaust hole 12 more tightly.

[0061] Of course, in other embodiments, the size of the magnetic ring 4 is equal to the size of the secondary smoke exhaust hole 12, i.e., a = b, which can also achieve the sealing of the secondary smoke exhaust hole 12. In this case, the first magnetic ring 2 should be set at the edge of the secondary smoke exhaust hole 12, that is, the distance d between the first magnetic ring 2 and the secondary smoke exhaust hole 12 is 0, so that when the magnetic ring 4 and the first magnetic ring 2 are in contact, the magnetic ring 4 can just block the secondary smoke exhaust hole 12.

[0062] In this embodiment, the area of ​​the secondary exhaust port 12 is smaller than the area of ​​the primary exhaust port 11. By setting the area of ​​the secondary exhaust port 12 to be smaller than the area of ​​the primary exhaust port 11, after the primary exhaust port 11 is blocked by ice and the secondary exhaust port 12 is opened, the temperature of the exhaust pipe body 1 remains higher than the preset temperature, causing the ice layer in the primary exhaust port 11 to gradually melt, thereby restoring the water heater to normal working condition.

[0063] Specifically, by setting the area of ​​the secondary exhaust port 12 to be smaller than that of the primary exhaust port 11, when the primary exhaust port 11 freezes, the exhaust gas is discharged from the secondary exhaust port 12 more slowly due to its smaller area. The heat of the exhaust gas accumulates in the exhaust pipe 100, which allows the ice layer accumulated in the primary exhaust port 11 to gradually melt, enabling the primary exhaust port 11 to return to normal use more quickly and further improving the antifreeze effect of the exhaust pipe 100.

[0064] During the process from the freezing of the primary exhaust port 11 to its restoration to normal operation, the exhaust pipe 100 undergoes the following process: When the primary exhaust port 11 is frozen, the flue gas rapidly accumulates within the exhaust pipe 100, causing the temperature of the exhaust pipe body 1 to rise. The temperature of the first magnetic ring 2 and the second magnetic ring 3, fixed to the exhaust pipe body 1, also rises to above the preset temperature. The magnetic ring moves from its position near the first magnetic ring 2 towards the second magnetic ring 3, opening the secondary exhaust port 12. Due to the smaller area of ​​the secondary exhaust port 12, the flue gas exits more slowly from it, and combustion continues. However, the flue gas accumulates within the exhaust pipe 100, maintaining a higher temperature, and the ice layer at the primary exhaust port 11 gradually melts. Once the primary exhaust port 11 is cleared again, the exhaust gas speed is faster, and there is no more smoke accumulation in the exhaust pipe 100. The temperature of the exhaust pipe body 1, the first magnetic ring 2, and the second magnetic ring 3 will drop below the preset temperature. The magnetic attraction force of the first magnetic ring 2 on the magnetic attraction ring 4 will be restored to be greater than the magnetic attraction force of the second magnetic ring 3 on the magnetic ring. The magnetic attraction ring 4 will move closer to the first magnetic ring 2 and re-seal the secondary exhaust port 12. The exhaust pipe 100 will return to the normal working state where the primary exhaust port 11 is clear and the secondary exhaust port 12 is closed.

[0065] Considering that the magnetic attraction force on the magnetic ring 4 in the magnetic field is related to the magnetic field strength at its location, and the magnetic field strength at different locations is related to the distance from that location to the first magnetic ring 2 and the second magnetic ring 3, when the secondary exhaust port 12 is blocked, the magnetic ring 4 is closer to the first magnetic ring 2. However, the magnetic attraction force of the second magnetic ring 3 on the magnetic ring 4 needs to be greater than the magnetic attraction force of the first magnetic ring 2 on the magnetic ring 4 for the second magnetic ring 3 to attract the magnetic ring 4 to move to the position where the secondary exhaust port 12 is open. Therefore, when the temperature is higher than the preset temperature, the magnetism of the second magnetic ring 3 is much greater than the magnetism of the first magnetic ring 2. Similarly, when the secondary exhaust port 12 is open, the magnetic ring 4 is closer to the second magnetic ring 3, but the magnetic attraction force of the first magnetic ring 2 on the magnetic ring 4 needs to be greater than the magnetic attraction force of the second magnetic ring 3 on the magnetic ring 4 for the first magnetic ring 2 to attract the magnetic ring 4 back to the position where the secondary exhaust port 12 is blocked. Therefore, when the temperature is lower than the preset temperature, the magnetism of the first magnetic ring 2 is much greater than the magnetism of the second magnetic ring 3. In summary, when selecting the first magnetic ring 2 and the second magnetic ring 3, attention should be paid to the correspondence between the magnetism of the first magnetic ring 2 and the second magnetic ring 3 and the temperature. Of course, a simple test can also be used to verify whether the magnetic attraction force of the first magnetic ring 2 and the second magnetic ring 3 on the magnetic ring 4 at different temperatures meets the requirements of this technical solution, which will not be elaborated here.

[0066] In this embodiment, the area of ​​the primary exhaust port 11 is more than twice the area of ​​the secondary exhaust port 12. By setting the area of ​​the primary exhaust port 11 to be more than twice the area of ​​the secondary exhaust port 12, that is, the area of ​​the primary exhaust port 11 is much larger than the area of ​​the secondary exhaust port 12, the smoke in the exhaust pipe 100 accumulates more quickly when the primary exhaust port 11 is blocked by ice, the temperature rise of the exhaust pipe 100 is more obvious, and thus the melting of the ice layer is accelerated, so that the exhaust pipe 100 can return to normal working condition as soon as possible.

[0067] Of course, in other embodiments, the greater the area difference between the secondary exhaust port 12 and the exhaust port, the more flue gas accumulates, the higher the temperature of the exhaust pipe body 1, and the faster the ice layer in the primary exhaust port 11 melts. However, if the area of ​​the secondary exhaust port 12 is too small, the water heater using the exhaust pipe 100 may not be able to continue burning. The area of ​​the secondary exhaust port 12 can be adjusted according to actual needs, which will not be elaborated here.

[0068] Specifically, in this embodiment, the secondary exhaust port 12 includes several strip-shaped through holes extending circumferentially along the exhaust pipe body 1. By setting the secondary exhaust port 12 as several through holes extending circumferentially along the exhaust pipe body 1, it is possible to cover a larger exhaust area with a narrower axial width while ensuring the structural strength of the exhaust pipe 100.

[0069] Of course, in other embodiments, there is no limitation on the specific shape of the secondary smoke exhaust hole 12. The secondary smoke exhaust hole 12 can be arranged as centrally as possible so that the magnetic ring 4 can cover and block it.

[0070] In this embodiment, the magnetic ring 4 is a metal ring that can be magnetically attracted. By making the magnetic ring 4 a metal ring, it is easier to process and manufacture.

[0071] In this embodiment, the primary smoke exhaust hole 11 is located outside the movement path of the magnetic ring 4. By positioning the primary smoke exhaust hole 11 outside the movement path of the magnetic ring 4, the primary smoke exhaust hole 11 is prevented from being blocked by the magnetic ring 4, thus avoiding affecting smoke exhaust.

[0072] Meanwhile, in this embodiment, the inner circumferential side of the magnetic ring 4 is attached to the outer circumferential side of the exhaust pipe body 1.

[0073] By setting the inner circumference of the magnetic ring 4 to fit against the outer circumference of the exhaust pipe body 1, the airtightness of the magnetic ring 4 when sealing the secondary exhaust hole 12 can be enhanced.

[0074] like Figure 4As shown, this embodiment also provides a gas water heater, which includes the exhaust pipe 100 as described above. By providing the exhaust pipe 100 as described above in the gas water heater, the gas water heater can still start normally even after the primary exhaust port 11 of the exhaust pipe 100 is blocked by ice, and the primary exhaust port 11 of the exhaust pipe 100 can be thawed after being blocked by ice to allow the gas water heater to return to normal working condition.

[0075] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A smoke exhaust pipe, comprising a smoke exhaust pipe body having a primary smoke exhaust port, characterized in that, The exhaust pipe also includes: A secondary smoke exhaust port, wherein the primary smoke exhaust port and the secondary smoke exhaust port are spaced apart along the axial direction of the smoke exhaust pipe body at the air outlet end of the smoke exhaust pipe body; The first magnetic ring and the second magnetic ring are permanent magnets with different magnetic properties and temperature relationships. The first magnetic ring and the second magnetic ring are respectively fixed on both sides of the secondary smoke exhaust hole. A magnetic ring is disposed between the first magnetic ring and the second magnetic ring. The magnetic ring is capable of moving relative to the exhaust pipe body along the axial direction of the exhaust pipe body according to the change of the magnetic attraction force of the first magnetic ring relative to the second magnetic ring. When the temperature of the first magnetic ring and the second magnetic ring is lower than the preset temperature, the magnetic ring moves closer to the first magnetic ring to block the secondary smoke exhaust hole; when the temperature of the first magnetic ring and the second magnetic ring is higher than the preset temperature, the magnetic ring moves closer to the second magnetic ring to open the secondary smoke exhaust hole.

2. The exhaust pipe as described in claim 1, characterized in that, When the temperature of the first magnetic ring is higher than the preset temperature, the magnetism of the first magnetic ring disappears.

3. The exhaust pipe as described in claim 1, characterized in that, Along the axial direction of the exhaust pipe body, the size of the magnetic ring is larger than the size of the secondary exhaust hole.

4. The exhaust pipe as described in claim 1, characterized in that, Along the axial direction of the exhaust pipe body, the distance between the second magnetic ring and the secondary exhaust hole is greater than the size of the magnetic ring.

5. The exhaust pipe as described in claim 1, characterized in that, The area of ​​the secondary smoke exhaust hole is smaller than the area of ​​the primary smoke exhaust hole.

6. The exhaust pipe as described in claim 5, characterized in that, The area of ​​the primary smoke exhaust hole is more than twice the area of ​​the secondary smoke exhaust hole.

7. The exhaust pipe as described in claim 1, characterized in that, The magnetic ring is a metal ring.

8. The exhaust pipe as described in claim 1, characterized in that, The primary smoke exhaust hole is located outside the movement path of the magnetic ring; And / or, the inner circumferential side of the magnetic ring is in contact with the outer circumferential side of the exhaust pipe body.

9. The exhaust pipe as described in claim 1, characterized in that, The secondary smoke exhaust port includes several strip-shaped through holes extending circumferentially along the body of the smoke exhaust pipe.

10. A water heater, characterized in that, The water heater includes a flue pipe as described in any one of claims 1-9.

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