Filtering devices for gas water heaters and gas water heaters
By designing a filter device with a backwashing mechanism, the problem of short service life of filter elements in gas water heaters has been solved, and the self-cleaning and atomization effects of the filter elements have been stabilized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- A O SMITH (CHINA) WATER HEATER CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-30
AI Technical Summary
In existing gas water heaters, the deposition of impurities on the surface of the atomizing plate of the condensate atomizing device leads to a decrease in atomization effect and a short service life of the filter element.
Design a filtration device comprising a housing, a filter element, and a drain port. The filter element is self-cleaned through a backwashing mechanism, and impurities are flushed down and discharged by the fluid, thus extending the life of the filter element.
The backwashing mechanism effectively removes impurities from the filter elements, extends their service life, and maintains the atomization effect.
Smart Images
Figure CN224422187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas water heater technology, and in particular to a filter device for a gas water heater and a gas water heater. Background Technology
[0002] In the field of gas water heaters, to improve energy conversion efficiency, a condensing heat exchanger is usually installed downstream of the main heat exchanger. When water flows through the condensing heat exchanger and exchanges heat with the flue gas, water vapor in the flue gas is cooled and precipitated, forming condensate on the surface of the condensing heat exchanger. To avoid the need for an external drain pipe to discharge the condensate, existing technology incorporates a condensate atomizing device inside the gas water heater. The condensate formed on the surface of the condensing heat exchanger is discharged into the condensate atomizing device, which then atomizes the condensate and discharges it along with the flue gas.
[0003] Because condensate contains impurities, the atomization effect of the condensate atomizing device decreases as these impurities accumulate on the surface of the atomizing plates. Current technology involves filtering the condensate discharged from the condenser heat exchanger through a filter before it enters the atomizing device. However, after a period of time, impurities accumulate on the filter, and this inability to clean the filter in a timely manner leads to a shorter lifespan for the filter. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a filter device and a gas water heater that can solve the problem of low service life of filter elements.
[0005] The specific technical solution of this utility model embodiment is as follows:
[0006] A filtration device for a gas water heater, the filtration device comprising:
[0007] A housing having a first port, a second port, and a drain port, and an overflow chamber formed inside the housing that connects the first port, the second port, and the drain port respectively;
[0008] A first switching mechanism that controls the connection between the sewage discharge port and the flow chamber;
[0009] The filter element has a first flow channel formed between the first port and the second port through the flow chamber, and a second flow channel formed between the second port and the drain port through the flow chamber. The filter element is disposed on the flow channel where the first flow channel and the second flow channel overlap, so as to filter the fluid flowing through it.
[0010] Preferably, the height of the second port is higher than the height of the sewage discharge port.
[0011] Preferably, the drain port is located at the bottom of the housing.
[0012] Preferably, the second port is used to communicate with the atomizing chamber of the atomizing mechanism, or the second port can be connected to and disconnected from the hot water exchange circuit of the gas water heater; the first port is used to communicate with the bottom of the heat exchange chamber with the secondary heat exchange unit.
[0013] Preferably, the filter element includes a filter screen.
[0014] Preferably, the filter device for the gas water heater has a backwashing state. In the backwashing state, the first on / off mechanism is in the open state, and the condensate in the atomizing chamber or the water in the hot water exchange circuit of the gas water heater flows in from the second port, passes through the filter element, and is discharged from the drain port.
[0015] Preferably, at least part of the housing shown is made of a transparent or translucent material.
[0016] Preferably, the housing has an isolation section to divide the flow chamber into a first chamber and a second chamber. The isolation section has a communication port that connects the first chamber and the second chamber. The first port is connected to the first chamber, and the second port is connected to the second chamber.
[0017] Preferably, the sewage discharge port is connected to the first chamber.
[0018] Preferably, the isolation section extends vertically, and the communication port is located at the lower end of the isolation section.
[0019] Preferably, the isolation portion extends vertically, and the housing has a third port, which communicates with the second chamber, and the height of the third port is higher than the height of the communication port.
[0020] Preferably, the filtration device comprises:
[0021] A drain pipe connected to the third port is connected to and disconnected from the second chamber via a second switching mechanism.
[0022] Preferably, the height of the second port is lower than the height of the first port.
[0023] Preferably, the filter element has a tendency to extend in a horizontal direction, and when the fluid flows from the first port through the first flow channel to the second port, the fluid flows through the filter element from bottom to top.
[0024] A gas water heater, the gas water heater comprising:
[0025] A heat exchange chamber with a secondary heat exchange unit;
[0026] As in any of the above-described filtration devices, the first port is connected to the bottom of the heat exchange chamber;
[0027] An atomizing mechanism having an atomizing chamber, wherein the second port is connected to the atomizing chamber, and the atomizing mechanism is used to atomize the condensed water in the atomizing chamber.
[0028] Preferably, the bottom of the heat exchange chamber, the filter device, and the atomizing chamber form a communicating vessel structure.
[0029] Preferably, the housing has an isolation section to divide the flow chamber into a first chamber and a second chamber. The isolation section has a communication port connecting the first chamber and the second chamber. The first port is connected to the first chamber, and the second port is connected to the second chamber. The isolation section extends vertically, and the housing has a third port, which is connected to the second chamber. The height of the third port is higher than the height of the communication port.
[0030] The height of the third port is lower than the bottom of the heat exchange chamber.
[0031] Preferably, the gas water heater includes: a hot water exchange circuit, which can be connected to or disconnected from the atomizing chamber of the atomizing mechanism or the second port.
[0032] The technical solution of this utility model has the following significant beneficial effects:
[0033] Fluid can be input into the filter device from the first port. As the fluid flows through the first channel of the flow chamber, it passes through the filter element for filtration, and then flows out from the second port. Impurities in the fluid are intercepted and accumulated on the filter element. When the impurities on the filter element reach a certain level, the user can control the first on / off mechanism to connect the drain port with the flow chamber. The fluid then flows back from the second port, reverses its flow through the filter element, and is discharged from the drain port. During this process, impurities on the filter element are flushed off by the fluid and discharged with it from the drain port. This achieves backwashing and self-cleaning of the filter element, effectively ensuring its service life. Attached Figure Description
[0034] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.
[0035] Figure 1 This is a schematic diagram showing the connection between the filtration device, the atomizing mechanism, and the heat exchange chamber with a secondary heat exchange unit in this utility model.
[0036] Figure 2 This is a schematic diagram of the filtration device in this utility model.
[0037] The reference numerals in the above figures are as follows:
[0038] 1. Housing; 11. First port; 12. Second port; 13. Drain port; 14. Isolation section; 141. Connecting port; 15. Third port; 2. Flow chamber; 3. First on / off mechanism; 4. Filter element; 100. Filter device; 200. Heat exchange chamber; 2001. Secondary heat exchange unit; 300. Atomizing mechanism; 3001. Atomizing chamber; 3002. Atomizer. Detailed Implementation
[0039] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0040] In order to solve the problem of the short service life of filter element 4, this application proposes a filter device 100 for gas water heaters. Figure 1 This is a schematic diagram showing the connection between the filtration device, the atomizing mechanism, and the heat exchange chamber 200 with a secondary heat exchange unit 2001 in this utility model. Figure 2 This is a schematic diagram of the filter device in this utility model, as shown below. Figure 1 and Figure 2As shown, the filtration device 100 may include: a housing 1 having a first port 11, a second port 12, and a drain port 13, and a flow chamber 2 formed inside the housing 1 that connects the first port 11, the second port 12, and the drain port 13 respectively; a first on / off mechanism 3 for controlling the connection between the drain port 13 and the flow chamber 2; and a filter element 4, wherein the first port 11 forms a first flow channel between the flow chamber 2 and the second port 12, and the second port 12 forms a second flow channel between the flow chamber 2 and the drain port 13, and the filter element 4 is disposed on the flow channel where the first flow channel and the second flow channel overlap, so as to filter the fluid flowing through it.
[0041] Fluid can be input into the filter device 100 through the first port 11. When the fluid flows through the first flow channel of the flow chamber 2, it passes through the filter element 4 to be filtered, and then flows out from the second port 12. Impurities in the fluid are intercepted and accumulated on the filter element 4. When the impurities on the filter element 4 reach a certain level, the user can control the first on / off mechanism 3 to connect the drain port 13 with the flow chamber 2. The fluid flows back from the second port 12, flows in the opposite direction through the filter element 4, and then is discharged from the drain port 13. During this process, the impurities on the filter element 4 are washed down by the fluid and discharged from the drain port 13 along with the fluid. This achieves backwashing and self-cleaning of the filter element 4, thereby effectively ensuring the service life of the filter element 4.
[0042] like Figure 1 As shown, the second port 12 is used to communicate with the atomizing chamber 3001 of the atomizing mechanism 300. Alternatively, the second port 12 can be connected to or disconnected from the heat exchange circuit of the gas water heater. The heat exchange pipes of the main heat exchange unit and / or the heat exchange pipes of the secondary heat exchange unit 2001 of the gas water heater can form at least part of the heat exchange circuit of the gas water heater. Of course, the heat exchange circuit may also include: the upstream of the heat exchange pipes of the secondary heat exchange unit 2001, the downstream of the heat exchange pipes of the main heat exchange unit, and the pipes between the pipes of the secondary heat exchange unit 2001 and the heat exchange pipes of the main heat exchange unit.
[0043] The first port 11 is used to communicate with the bottom of the heat exchange chamber 200 having a secondary heat exchange unit 2001. The filter device 100 for the gas water heater has a backwash state. In the backwash state, the first on / off mechanism 3 is in the open state. The condensate in the atomizing chamber 3001 or the water in the hot water exchange circuit of the gas water heater flows in from the second port 12, passes through the filter element 4, and is discharged from the drain port 13.
[0044] To ensure that the condensate at the bottom of the heat exchange chamber 200 of the secondary heat exchange unit 2001 can automatically flow into the first port 11 of the shell 1 and enter the flow chamber 2 under the action of gravity, as a feasible method is... Figure 2 As shown, the first port 11 is located at the upper part of the housing 1, and further, it may have an upward orientation.
[0045] As a feasible option, such as Figure 2 As shown, the height of the second port 12 can be higher than the height of the drain port 13. In this way, when the first switching mechanism 3 is opened, the condensate in the atomizing chamber 3001 can automatically flow back into the second port 12 of the housing 1 under the action of gravity and enter the flow chamber 2. After flowing through the filter element 4 in reverse, it is discharged from the drain port 13.
[0046] To ensure that impurities on filter element 4 are discharged from drain port 13 as much as possible with the condensate as it flows from second port 12 to drain port 13, thus reducing the possibility of them depositing in flow chamber 2, as a feasible approach is to... Figure 2 As shown, the drain port 13 can be located at the bottom of the housing 1. Furthermore, this method ensures that the condensate in the flow chamber 2 can be completely drained through the drain port 13.
[0047] The filter element 4 can be a component capable of filtering and intercepting impurities in the fluid, and its specific structure is not limited in this application. Alternatively, as a feasible option... Figure 2 As shown, the filter element 4 can take the form of a filter screen, filter sponge, etc. Alternatively, the filter element 4 can have a tendency to extend horizontally, so that when the fluid flows from the first port 11 through the first flow channel to the second port 12, the fluid flows upward through the filter element 4. In this way, impurities in the fluid accumulate on the lower surface of the filter element 4, and under the action of gravity, some of the impurities will fall away from the filter element 4, thus improving the service life of the filter element 4.
[0048] Furthermore, such as Figure 2 As shown, the filter element 4 can be made into an upwardly or downwardly convex curved surface, which can further increase the filtration area of the filter element 4, thereby filtering and intercepting more impurities. In addition, when the fluid flows back from the second port 12 through the filter element 4 and is discharged from the drain port 13, the above structure helps to dislodge impurities on the filter element 4 during backwashing and discharge them from the drain port 13.
[0049] In order for users to visually understand the impurities deposited on the filter screen inside the filter device 100 so as to switch the filter device 100 to the backwashing state, at least part of the housing 1 shown is made of transparent or translucent material.
[0050] As a feasible option, such as Figure 2As shown, the housing 1 has an isolation section 14 to divide the flow chamber 2 into a first chamber and a second chamber. The isolation section 14 has a connecting port 141 that connects the first and second chambers. A first port 11 connects to the first chamber, and a second port 12 connects to the second chamber. Fluid can enter the first chamber of the filter device 100 from the first port 11, and then flow into the second chamber through the connecting port 141. During this process, the first chamber acts as a sedimentation chamber, allowing some impurities in the fluid to settle and accumulate. To ensure the sedimentation effect in the first chamber, the isolation section 14 extends vertically, and the connecting port 141 is located at the lower end of the isolation section 14, with a certain distance between the connecting port 141 and the bottom of the first chamber.
[0051] To facilitate the removal of as many impurities as possible from the first chamber, such as Figure 2 As shown, preferably, the drain port 13 can be connected to the first chamber.
[0052] As a feasible option, such as Figure 2 As shown, the housing 1 may have a third port 15, which communicates with the second chamber. The height of the third port 15 is higher than the height of the connecting port 141. When it is necessary to drain the condensate at the bottom of the heat exchange chamber 200 of the secondary heat exchange unit 2001, the third port 15 can be opened. At this time, the first chamber, the connecting port 141, and the second chamber will form a liquid seal, allowing the condensate to drain through the third port 15. However, the flue gas in the heat exchange chamber 200 of the secondary heat exchange unit 2001 cannot pass through the first chamber, the connecting port 141, and the second chamber before being discharged from the third port 15. This effectively prevents the flue gas in the heat exchange chamber 200 of the secondary heat exchange unit 2001 from leaking into the room where the gas water heater is installed.
[0053] Furthermore, the filtration device 100 includes a drain pipe connected to the third port 15, which can be switched on and off with the second chamber via a second on / off mechanism. The second on / off mechanism can be used to open and close the third port 15 to control whether condensate in the heat exchange chamber 200 of the secondary heat exchange unit 2001 needs to be discharged.
[0054] As a feasible option, such as Figure 2 As shown, the height of the second port 12 can be lower than the height of the first port 11. This allows the atomizing chamber 3001 of the atomizing mechanism 300 to have a certain liquid level, thereby enabling the atomizing generator 3002 in the atomizing mechanism 300 to operate.
[0055] This application also proposes a gas water heater, such as Figure 1As shown, the gas water heater includes: a heat exchange chamber 200 having a secondary heat exchange unit 2001; a filter device 100 as described above, with a first port 11 connected to the bottom of the heat exchange chamber 200; and an atomizing mechanism 300 having an atomizing chamber 3001, with a second port 12 connected to the atomizing chamber 3001, the atomizing mechanism 300 being used to atomize the condensate in the atomizing chamber 3001.
[0056] As an option, the bottom of the heat exchange chamber 200, the filter device 100, and the atomizing chamber 3001 can form a communicating vessel structure. A portion of the condensate at the bottom of the heat exchange chamber 200 can be stored in the filter device 100. This helps to control the condensate level in the atomizing chamber 3001 to be within a reasonable range and reduces the possibility of it being too high.
[0057] The height of the third port 15 is lower than the bottom of the heat exchange chamber 200. When the third port 15 is open, the above structure allows the condensate at the bottom of the heat exchange chamber 200 to be discharged from the third port 15 under the action of gravity.
[0058] As an option, the gas water heater may include a hot water exchange circuit, which can be connected to or disconnected from the atomizing chamber 3001 or the second port 12 of the atomizing mechanism 300. In the backwashing state, in one embodiment, the first on / off mechanism 3 is in the open state, and the condensate in the atomizing chamber 3001 flows in from the second port 12, passes through the filter element 4, and is discharged from the drain port 13. In another embodiment, the hot water exchange circuit of the gas water heater can be connected to the second port 12, and the water in the hot water exchange circuit can directly flow in from the second port 12, pass through the filter element 4, and be discharged from the drain port 13; the hot water exchange circuit of the gas water heater can also be connected to the atomizing chamber 3001 of the atomizing mechanism 300, so that the water in the hot water exchange circuit first enters the atomizing chamber 3001 of the atomizing mechanism 300, and then flows in from the second port 12, passes through the filter element 4, and is discharged from the drain port 13.
[0059] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.
[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A filtration device for a gas water heater, characterized in that, The filtration device includes: A housing having a first port, a second port, and a drain port, and an overflow chamber formed inside the housing that connects the first port, the second port, and the drain port respectively; A first switching mechanism that controls the connection between the sewage discharge port and the flow chamber; The filter element has a first flow channel formed between the first port and the second port through the flow chamber, and a second flow channel formed between the second port and the drain port through the flow chamber. The filter element is disposed on the flow channel where the first flow channel and the second flow channel overlap, so as to filter the fluid flowing through it.
2. The filtration device for a gas water heater according to claim 1, characterized in that, The height of the second port is higher than the height of the sewage discharge port.
3. The filtration device for a gas water heater according to claim 1, characterized in that, The drain port is located at the bottom of the housing.
4. The filtration device for a gas water heater according to claim 1, characterized in that, The second port is used to communicate with the atomizing chamber of the atomizing mechanism, or the second port can be connected to or disconnected from the hot water exchange circuit of the gas water heater; the first port is used to communicate with the bottom of the heat exchange chamber with the secondary heat exchange unit.
5. The filtration device for a gas water heater according to claim 1, characterized in that, The filter element includes a filter screen.
6. The filtration device for a gas water heater according to claim 4, characterized in that, The filter device for the gas water heater has a backwashing state. In the backwashing state, the first on / off mechanism is in the open state, and the condensate in the atomizing chamber or the water in the hot water exchange circuit of the gas water heater flows in from the second port, passes through the filter element, and is discharged from the drain port.
7. The filtration device for a gas water heater according to claim 1, characterized in that, At least part of the casing shown is made of transparent or translucent material.
8. The filtration device for a gas water heater according to claim 1, characterized in that, The housing has an isolation section to divide the flow chamber into a first chamber and a second chamber. The isolation section has a communication port that connects the first chamber and the second chamber. The first port is connected to the first chamber, and the second port is connected to the second chamber.
9. The filtration device for a gas water heater according to claim 8, characterized in that, The sewage discharge port is connected to the first chamber.
10. The filtration device for a gas water heater according to claim 8, characterized in that, The isolation section extends vertically, and the communication port is located at the lower end of the isolation section.
11. The filtration device for a gas water heater according to claim 8, characterized in that, The isolation section extends vertically, and the housing has a third port, which communicates with the second chamber. The height of the third port is higher than the height of the communication opening.
12. The filtration device for a gas water heater according to claim 11, characterized in that, The filtration device includes: A drain pipe connected to the third port is connected to and disconnected from the second chamber via a second switching mechanism.
13. The filtration device for a gas water heater according to claim 1, characterized in that, The height of the second port is lower than the height of the first port.
14. The filtration device for a gas water heater according to claim 1, characterized in that, The filter element tends to extend in the horizontal direction, and when fluid flows from the first port through the first flow channel to the second port, the fluid flows through the filter element from bottom to top.
15. A gas-fired water heater, characterized in that, The gas water heater includes: A heat exchange chamber with a secondary heat exchange unit; The filtration device as described in any one of claims 1 to 14, wherein the first port is in communication with the bottom of the heat exchange chamber; An atomizing mechanism having an atomizing chamber, wherein the second port is connected to the atomizing chamber, and the atomizing mechanism is used to atomize the condensed water in the atomizing chamber.
16. The gas water heater according to claim 15, characterized in that, The bottom of the heat exchange chamber, the filter device, and the atomizing chamber form a communicating vessel structure.
17. The gas water heater according to claim 15, characterized in that, The housing has an isolation section to divide the flow chamber into a first chamber and a second chamber. The isolation section has a communication port that connects the first chamber and the second chamber. The first port is connected to the first chamber, and the second port is connected to the second chamber. The isolation section extends vertically, and the housing has a third port that is connected to the second chamber. The height of the third port is higher than the height of the communication port. The height of the third port is lower than the bottom of the heat exchange chamber.
18. The gas water heater according to claim 15, characterized in that, The gas water heater includes a hot water exchange circuit, which can be connected to or disconnected from the atomizing chamber of the atomizing mechanism or the second port.