Water flow sensor and gas water heater

Abstract

The utility model relates to the technical field of flow sensors, in particular to a water flow sensor and a gas water heater. The water flow sensor comprises a shell which is provided with a water inlet, a water outlet and a connecting channel communicating the water inlet with the water outlet; the impeller assembly is arranged in the connecting channel; wherein the side wall of the connecting channel is provided with a dismounting port for the impeller assembly to enter and exit from the shell; the outer side of the disassembly and assembly opening is covered with a cover plate piece used for blocking the disassembly and assembly opening. The cover plate piece is detachably connected to the shell through the fixed connecting piece. According to the water flow sensor, the impeller assembly can be detached and cleaned or detached and replaced, and the maintenance cost is reduced when the impeller assembly breaks down.

Description

Technical Field

[0001] The utility model relates to the technical field of flow sensors, and more specifically to a water flow sensor and a gas water heater. Background Art

[0002] At present, electrical equipment such as gas water heaters, water purifiers, smart kitchens and bathrooms generally have a water flow sensor installed in the water inlet joint, and use the water flow sensor as a device startup or water flow detection element.

[0003] Taking a gas water heater as an example, in the prior art, a water inlet connector of the gas water heater is connected to a water flow sensor to monitor the water flow.

[0004] It should be noted that the impeller assembly in the existing water flow sensor is generally non-detachably fixed to the water flow sensor, causing the impeller assembly to be stuck by impurities or foreign objects in the water (especially when the gas water heater with the water flow sensor is installed in an old residential area, because many of the water supply pipes in the old residential area are iron pipes, rust or impurities in the water often get stuck in the impeller assembly, hindering its operation). When the water flow sensor cannot work normally, the impeller assembly cannot be disassembled, cleaned or replaced in a targeted manner, and the water flow sensor can only be replaced as a whole, resulting in excessively high maintenance costs. Utility Model Content

[0005] One of the purposes of the utility model is to address the deficiencies of the prior art and provide a water flow sensor capable of disassembling and cleaning or replacing an impeller assembly to reduce maintenance costs when the impeller assembly fails.

[0006] The second purpose of the utility model is to provide a gas water heater having the above-mentioned water flow sensor.

[0007] The technical solutions of the utility model are as follows:

[0008] Water flow sensor, including:

[0009] A housing having: a water inlet, a water outlet, and a connecting passage connecting the water inlet and the water outlet;

[0010] an impeller assembly disposed within the connecting passage;

[0011] Wherein, the side wall of the connecting channel is provided with: a disassembly opening for the impeller assembly to enter and exit the housing;

[0012] The outer cover of the disassembly and assembly port is equipped with: a cover plate member for sealing the disassembly and assembly port;

[0013] The cover plate is detachably connected to the housing through a fastening member.

[0014] Further as a preferred solution, the fastening member is: a buckle detachably connected to the housing;

[0015] The buckle includes: two clamps arranged at intervals, and a connecting arm connecting the two clamps;

[0016] Each clamp is provided with a clamping hole, and the outer side wall of the disassembly and assembly port is provided with: a flange portion protruding outwards to match each clamping hole;

[0017] The cover plate is matched with each clamping hole and is provided with: a fitting portion fitting with the flange portion;

[0018] The flange part and the fitting part that fit together are embedded in the clamping hole together, so that the cover plate is connected to the shell;

[0019] The connecting arm is elastic so that the buckle can be detached from the shell by driving the connecting arm to perform elastic deformation.

[0020] As a further preferred solution, the fastening member is: a connecting nut detachably connected to the housing;

[0021] The connecting nut comprises: a sleeve portion sleeved on the outer periphery of the cover plate;

[0022] One end of the sleeve part is sleeved on the outer periphery of the disassembly and assembly opening and is screwed with the outer side wall of the disassembly and assembly opening;

[0023] The other end of the sleeve portion has: a limiting portion disposed on the side of the cover plate member away from the disassembly opening;

[0024] The limiting portion is configured to apply a pressing action on the cover plate member in the direction of the disassembly and assembly opening so that the cover plate member is connected to the housing.

[0025] As a further preferred solution, the cover plate member comprises: an inserting portion adapted to be embedded in the disassembly opening.

[0026] As a further preferred solution, the cover plate has an abutment portion inserted into the connecting channel from the disassembly opening, and an insertion end of the abutment portion abuts against the impeller assembly.

[0027] As a further preferred solution, the abutting portion includes: a connecting rod connected to the cover plate member, and a plurality of connecting rods are distributed at intervals on a side surface of the cover plate member facing the impeller assembly.

[0028] As a further preferred solution, the abutting portion further includes: a limiting ring connected to the plurality of connecting rods and used to abut against the impeller assembly.

[0029] As a further preferred solution, the end surface of the disassembly opening is provided with: a sealing groove with a notch facing the cover plate member;

[0030] The sealing groove contains a sealing member which is elastic and is pressed by the cover plate member and the shell.

[0031] As a further preferred solution, the sealing groove is an annular groove arranged around the disassembly and assembly port, and the sealing member is an annular member arranged to match the annular groove.

[0032] A gas water heater comprises a water flow sensor according to any of the above solutions.

[0033] The main beneficial effects of the above technical solution are:

[0034] By removing the cover plate, the impeller assembly can be taken out of the housing for cleaning or replacement. That is, when the impeller assembly fails, the impeller assembly can be disassembled and cleaned or replaced in a targeted manner to reduce maintenance costs.

[0035] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The utility model is further described below in conjunction with the accompanying drawings:

[0037] Figure 1 This is a cross-sectional diagram of a water flow sensor.

[0038] Figure 2 Exploded view of the water flow sensor assembly with snap-on clip.

[0039] Figure 3 It is a schematic diagram of the assembly structure of the buckle.

[0040] Figure 4 Exploded view of the water flow sensor assembly with connection nut diagram.

[0041] Figure 5 Schematic diagram of the assembly structure of the connecting nut.

[0042] As shown in the figure: shell -1, water inlet -1.1, water outlet -1.2, connecting channel -1.3, disassembly port -1.4, flange part -1.5, sealing groove -1.6, impeller assembly -2, cover plate part -3, fitting part -3.1, insertion part -3.2, abutment part -3.3, connecting rod -3.31, limiting ring -3.32, pinching part -3.4, buckle -4, clamp -4.1, clamping hole -4.11, connecting arm -4.2, connecting nut -5, sleeve part -5.1, limiting part -5.2, sealing part -6. DETAILED DESCRIPTION

[0043] The present invention is specifically described below with reference to the embodiments:

[0044] Embodiment 1:

[0045] Water flow sensor, as attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, it comprises a housing 1, on which a water inlet 1.1 for external water to flow in, and a water outlet 1.2 for internal water to flow out are arranged, and a connecting channel 1.3 connecting the water inlet 1.1 and the water outlet 1.2 is also arranged in the housing 1. When working, water flows from the water inlet 1.1 into the connecting channel 1.3, flows through the connecting channel 1.3 and then flows out from the water outlet 1.2.

[0046] In order to detect the water flow, an impeller assembly 2 is arranged in the connecting channel 1.3.

[0047] In this embodiment, in order to realize the detachability of the impeller assembly 2, as shown in the attached Figure 2 and attached Figure 3 As shown, a disassembly opening 1.4 for the impeller assembly 2 to enter and exit the housing 1 is provided on the side wall of the connecting channel 1.3. The impeller assembly 2 located outside the housing 1 can enter the connecting channel 1.3 inside the housing 1 through the disassembly opening 1.4, or the impeller assembly 2 located in the connecting channel 1.3 inside the housing 1 can leave the housing 1 through the disassembly opening 1.4 to remove the impeller assembly 2.

[0048] At the same time, on the basis of maintaining the detachability of the impeller assembly 2, in order to be able to block the disassembly opening 1.4 when the impeller assembly 2 is placed in the connecting channel 1.3, so that the water flow sensor can work normally.

[0049] In this embodiment, as shown in the attached Figure 2 and attached Figure 3 As shown, the outer cover of the disassembly opening 1.4 is equipped with a cover plate member 3 for blocking the disassembly opening 1.4. The cover plate member 3 is detachably connected to the housing 1 through a fixing member, that is, the cover plate member 3 can be fixed on the housing 1 and connected to the housing 1 to block the disassembly opening 1.4, or the cover plate member 3 can be disassembled so that the disassembly opening 1.4 is used as an unobstructed maintenance opening to disassemble / assemble the impeller assembly 2 as described above.

[0050] The impeller assembly 2 can be taken out of the housing 1 from the disassembly opening 1.4 to be cleaned or replaced by removing the cover plate 3. The cleaned impeller assembly 2 or a new impeller assembly 2 can be installed back into the connecting channel 1.3 from the disassembly opening 1.4, and the cover plate 3 can be installed back, so that the water flow sensor can continue to work. That is, when the impeller assembly fails, the impeller assembly can be disassembled and cleaned or replaced in a targeted manner to reduce the maintenance cost.

[0051] In this embodiment, as shown in the attached Figure 2 and attached Figure 3 As shown, the fastening member is a buckle 4 detachably connected to the housing 1 .

[0052] Specifically, in this embodiment, the buckle 4 includes two clamps 4.1 arranged at intervals, and a connecting arm 4.2 connecting the two clamps 4.1. Each clamp 4.1 is provided with a clamping hole 4.11, and a flange portion 1.5 protruding outward is provided on the outer side wall of the disassembly and assembly port 1.4 to match each clamping hole 4.11, and a fitting portion 3.1 that fits with the flange portion 1.5 is provided on the cover plate member 3 to match each clamping hole 4.11. The fitting flange portion 1.5 and the fitting portion 3.1 are embedded in the clamping hole 4.11 together, so that each fitting portion 3.1 of the cover plate member 3 is restricted to fit on a corresponding flange portion 1.5, so that the cover plate member 3 is connected to the housing 1.

[0053] At the same time, the connecting arm 4.2 is elastic, so that the buckle 4 can be detached from the housing 1 by driving the connecting arm 4.2 to undergo elastic deformation.

[0054] Specifically, when the cover member 3 is disassembled, the two clamps 4.1 can be pulled away from the shell 1 to move the clamps 4.1 away from the shell 1. During this pulling process, the connecting arm 4.2 is driven to undergo elastic deformation until the clamping holes 4.11 of the two clamps 4.1 are separated from the flange portion 1.5, so that the buckle 4 can be put into a disassembly state that can be separated from the shell 1, so that the buckle 4 and the cover member 3 can be removed from the shell 1 together.

[0055] When installing the cover plate member 3: cover the cover plate member 3 on the disassembly and assembly opening 1.4, and then pull the two clamps 4.1 until the clamping hole 4.11 of the clamp 4.1 can be moved to a position relative to the corresponding flange portion 1.5 and the fitting portion 3.1, and then let go. Under the elastic force of the connecting arm 4.2, the two clamps 4.1 are close to each other, so that the corresponding flange portion 1.5 and the fitting portion 3.1 are embedded in the clamping hole 4.11 together, so that the cover plate member 3 is connected to the shell 1.

[0056] Furthermore, in order to make the cover plate 3 more stably cover the disassembly opening 1.4, as shown in the attached Figure 1 As shown in FIG. 1 , the cover plate member 3 may also be provided with an inserting portion 3.2 adapted to be embedded in the disassembly opening 1.4.

[0057] Furthermore, as attached Figure 2 As shown in , the cover plate 3 may also have an abutment portion 3.3 inserted into the connecting channel 1.3 from the disassembly opening 1.4, and the insertion end of the abutment portion 3.3 abuts against the impeller assembly 2 to support and position the impeller assembly 2 placed in the connecting channel 1.3.

[0058] In this embodiment, the abutting portion 3.3 is preferably arranged on the inserting portion 3.2.

[0059] At this time, in order for the water in the housing 1 to still flow smoothly, as shown in the attached Figure 2 As shown in the figure, the abutment part 3.3 in this embodiment includes a connecting rod 3.31 connected to the cover plate 3, and a plurality of connecting rods 3.31 are distributed at intervals on a side surface of the cover plate 3 facing the impeller assembly 2 to abut against the impeller assembly 2. In this way, the impeller assembly 2 can be supported and positioned while avoiding obstruction to the water flow as much as possible.

[0060] Furthermore, in order to improve the stability of the overall structure of the abutment portion 3.3 and improve the support and positioning effect on the impeller assembly 2, in this embodiment, the abutment portion 3.3 may also include a stop ring 3.32 connected to a plurality of connecting rods 3.31, which is an annular structure with an opening in the middle, for abutting against the impeller assembly 2.

[0061] On the basis of the above, the end face of the disassembly and assembly port 1.4 can also be provided with: a sealing groove 1.6 with a notch facing the cover member 3; an elastic sealing member 6 (for example, a commonly used elastic sealing member made of rubber or silicone, etc.) is accommodated in the sealing groove 1.6. When the cover member 3 is installed, the cover member 3 and the shell 1 jointly extrude the sealing member 6 to improve the tightness of the installation of the cover member 3 and improve the sealing effect between the cover member 3 and the shell 1.

[0062] In this embodiment, the sealing groove 1.6 is preferably an annular groove arranged around the disassembly and assembly port 1.4, and the sealing member 6 is an annular member arranged to match the annular groove, so as to further improve the tightness of the installation of the cover member 3 and the sealing effect between the cover member 3 and the shell 1.

[0063] To facilitate the grabbing of the cover plate 3, as shown in the attached Figure 2 As shown, a gripping portion 3.4 for hand grasping may also be provided on the side of the cover plate 3 facing away from the housing 1.

[0064] Embodiment 2:

[0065] Water flow sensor, as attached Figure 1 , Attachment Figure 4 and attached Figure 5 As shown, it comprises a housing 1, on which a water inlet 1.1 for external water to flow in, and a water outlet 1.2 for internal water to flow out are arranged, and a connecting channel 1.3 connecting the water inlet 1.1 and the water outlet 1.2 is also arranged in the housing 1. When working, water flows from the water inlet 1.1 into the connecting channel 1.3, flows through the connecting channel 1.3 and then flows out from the water outlet 1.2.

[0066] In order to detect the water flow, an impeller assembly 2 is arranged in the connecting channel 1.3.

[0067] In this embodiment, in order to realize the detachability of the impeller assembly 2, as shown in the attached Figure 4 and attached Figure 5 As shown, a disassembly opening 1.4 for the impeller assembly 2 to enter and exit the housing 1 is provided on the side wall of the connecting channel 1.3. The impeller assembly 2 located outside the housing 1 can enter the connecting channel 1.3 inside the housing 1 through the disassembly opening 1.4, or the impeller assembly 2 located in the connecting channel 1.3 inside the housing 1 can leave the housing 1 through the disassembly opening 1.4 to remove the impeller assembly 2.

[0068] At the same time, on the basis of maintaining the detachability of the impeller assembly 2, in order to be able to block the disassembly opening 1.4 when the impeller assembly 2 is placed in the connecting channel 1.3, so that the water flow sensor can work normally.

[0069] In this embodiment, as shown in the attached Figure 4 and attached Figure 5 As shown, the outer cover of the disassembly opening 1.4 is equipped with a cover plate member 3 for blocking the disassembly opening 1.4. The cover plate member 3 is detachably connected to the housing 1 through a fixing member, that is, the cover plate member 3 can be fixed on the housing 1 and connected to the housing 1 to block the disassembly opening 1.4, or the cover plate member 3 can be disassembled so that the disassembly opening 1.4 is used as an unobstructed maintenance opening to disassemble / assemble the impeller assembly 2 as described above.

[0070] The impeller assembly 2 can be taken out of the housing 1 from the disassembly opening 1.4 to be cleaned or replaced by removing the cover plate 3. The cleaned impeller assembly 2 or a new impeller assembly 2 can be installed back into the connecting channel 1.3 from the disassembly opening 1.4, and the cover plate 3 can be installed back, so that the water flow sensor can continue to work. That is, when the impeller assembly fails, the impeller assembly can be disassembled and cleaned or replaced in a targeted manner to reduce the maintenance cost.

[0071] In this embodiment, as shown in the attached Figure 4 and attached Figure 5 As shown, the fastening member is a connecting nut 5 detachably connected to the housing 1 .

[0072] Specifically, the connecting nut 5 includes a sleeve portion 5.1 which is sleeved on the outer periphery of the cover plate 3. One end of the sleeve portion 5.1 (for example, an Figure 5 In the embodiment, the left end of the sleeve portion 5.1 is sleeved on the outer periphery of the disassembly opening 1.4 and is detachably screwed to the outer wall of the disassembly opening 1.4. For example, the outer wall of the disassembly opening 1.4 is provided with an external thread, and the inner wall of the sleeve portion 5.1 is provided with an internal thread screwed to the external thread; the other end of the sleeve portion 5.1 (for example, the attached Figure 5 In the embodiment, the right end of the sleeve portion 5.1 has a stopper 5.2 disposed on the side of the cover plate 3 away from the disassembly opening 1.4. The stopper 5.2 is configured to apply a pressing action on the cover plate 3 in the direction of the disassembly opening 1.4 so that the cover plate 3 is connected to the housing 1.

[0073] Specifically, when the cover plate member 3 is disassembled, Figure 4 As shown in : by twisting the connecting nut 5 to separate one end of the sleeve portion 5.1 from the housing 1, the connecting nut 5 and the cover plate member 3 can be removed from the housing 1 together.

[0074] When the cover plate member 3 is installed, Figure 5 As shown in: by fitting the left end of the sleeve 5.1 around the outer periphery of the disassembly opening 1.4 and twisting the sleeve 5.1 in the opposite direction (the opposite direction to the direction of removing the connection nut 5), the left end of the sleeve 5.1 can be screwed to the housing 1, and the cover 3 can be pushed close to the disassembly opening 1.4. Until the cover 3 is covered on the disassembly opening 1.4 and the limiter 5.2 is in contact with the cover 3 to apply a top pressure to the cover 3 in the direction of the disassembly opening 1.4, the sleeve 5.1 can be stopped twisting, and the cover 3 is connected to the housing 1.

[0075] Furthermore, in order to make the cover plate 3 more stably cover the disassembly opening 1.4, as shown in the attached Figure 1 As shown in FIG. 1 , the cover plate member 3 may also be provided with an inserting portion 3.2 adapted to be embedded in the disassembly opening 1.4.

[0076] Furthermore, as attached Figure 4 As shown in , the cover plate 3 may also have an abutment portion 3.3 inserted into the connecting channel 1.3 from the disassembly opening 1.4, and the insertion end of the abutment portion 3.3 abuts against the impeller assembly 2 to support and position the impeller assembly 2 placed in the connecting channel 1.3.

[0077] In this embodiment, the abutting portion 3.3 is preferably arranged on the inserting portion 3.2.

[0078] At this time, in order for the water in the housing 1 to still flow smoothly, as shown in the attached Figure 4 As shown in the figure, the abutment part 3.3 in this embodiment includes a connecting rod 3.31 connected to the cover plate 3, and a plurality of connecting rods 3.31 are distributed at intervals on a side surface of the cover plate 3 facing the impeller assembly 2 to abut against the impeller assembly 2. In this way, the impeller assembly 2 can be supported and positioned while avoiding obstruction to the water flow as much as possible.

[0079] Furthermore, in order to improve the stability of the overall structure of the abutment portion 3.3 and improve the support and positioning effect on the impeller assembly 2, in this embodiment, the abutment portion 3.3 may also include a stop ring 3.32 connected to a plurality of connecting rods 3.31, which is an annular structure with an opening in the middle, for abutting against the impeller assembly 2.

[0080] On the basis of the above, the end face of the disassembly and assembly port 1.4 can also be provided with: a sealing groove 1.6 with a notch facing the cover member 3; an elastic sealing member 6 (for example, a commonly used elastic sealing member made of rubber or silicone, etc.) is accommodated in the sealing groove 1.6. When the cover member 3 is installed, the cover member 3 and the shell 1 jointly extrude the sealing member 6 to improve the tightness of the installation of the cover member 3 and improve the sealing effect between the cover member 3 and the shell 1.

[0081] In this embodiment, the sealing groove 1.6 is preferably an annular groove arranged around the disassembly and assembly port 1.4, and the sealing member 6 is an annular member arranged to match the annular groove, so as to further improve the tightness of the installation of the cover member 3 and the sealing effect between the cover member 3 and the shell 1.

[0082] To facilitate the grabbing of the cover plate 3, as shown in the attached Figure 4 As shown, a gripping portion 3.4 for hand grasping may also be provided on the side of the cover plate 3 facing away from the housing 1.

[0083] Embodiment three:

[0084] A gas water heater comprises the water flow sensor described in any one of the schemes in the first embodiment, or comprises the water flow sensor described in any one of the schemes in the second embodiment.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. In addition, the terms "vertical", "horizontal", "front", "rear" and the like mentioned in the embodiments of the present invention indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be further explained that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like in the description should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0086] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A water flow sensor, characterized in that: include: A housing (1) comprising: a water inlet (1.1), a water outlet (1.2), and a connecting channel (1.3) for connecting the water inlet (1.1) and the water outlet (1.2); An impeller assembly (2) disposed in the connecting channel (1.3); Wherein, a side wall of the connecting channel (1.3) is provided with: a disassembly opening (1.4) for the impeller assembly (2) to enter and exit the housing (1); The outer side cover of the disassembly and assembly opening (1.4) is provided with: a cover plate member (3) for sealing the disassembly and assembly opening (1.4); The cover plate member (3) is detachably connected to the housing (1) via a fastening member.

2. The water flow sensor according to claim 1, characterized in that: The fixing member is: a buckle (4) detachably connected to the housing (1); The buckle (4) comprises: two clamps (4.1) arranged at intervals, and a connecting arm (4.2) connecting the two clamps (4.1); Each of the clamps (4.1) is provided with a clamping hole (4.11), and the outer side wall of the disassembly and assembly opening (1.4) is provided with: a flange portion (1.5) protruding outwards to match each of the clamping holes (4.11); The cover plate member (3) is provided with a fitting portion (3.1) that fits with the flange portion (1.5) so as to match each of the clamping holes (4.11); The flange portion (1.5) and the fitting portion (3.1) that fit together are embedded in the clamping hole (4.11) so that the cover plate member (3) is connected to the housing (1); The connecting arm (4.2) is elastic so that the buckle (4) can be put into a disassembled state from the housing (1) by driving the connecting arm (4.2) to undergo elastic deformation.

3. The water flow sensor according to claim 1, characterized in that: The fixing member is: a connecting nut (5) detachably connected to the housing (1); The connecting nut (5) comprises: a sleeve portion (5.1) sleeved on the outer circumference of the cover plate member (3); One end of the sleeve portion (5.1) is sleeved on the outer periphery of the disassembly opening (1.4) and is threadedly connected to the outer side wall of the disassembly opening (1.4); The other end of the sleeve portion (5.1) comprises: a limiting portion (5.2) disposed on the side of the cover plate member (3) facing away from the disassembly opening (1.4); The limiting portion (5.2) is configured to apply a pressing action on the cover plate member (3) in the direction of the disassembly opening (1.4), so that the cover plate member (3) is connected to the housing (1).

4. The water flow sensor according to any one of claims 1 to 3, characterized in that: The cover plate component (3) comprises an inserting portion (3.2) adapted to be embedded in the disassembly opening (1.4).

5. The water flow sensor according to any one of claims 1 to 3, characterized in that: The cover plate member (3) has an abutment portion (3.3) inserted into the connection channel (1.3) from the disassembly and assembly port (1.4), and the insertion end of the abutment portion (3.3) abuts against the impeller assembly (2).

6. The water flow sensor according to claim 5, characterized in that: The abutment portion (3.3) comprises: a connecting rod (3.31) connected to the cover plate member (3); A plurality of connecting rods (3.31) are distributed at intervals on a side surface of the cover plate (3) facing the impeller assembly (2).

7. The water flow sensor according to claim 6, characterized in that: The abutment portion (3.3) also includes a limiting ring (3.32) connected to the plurality of connecting rods (3.31) and used for abutting against the impeller assembly (2).

8. The water flow sensor according to any one of claims 1 to 3, characterized in that: The end surface of the disassembly and assembly opening (1.4) is provided with: a sealing groove (1.6) with a notch facing the cover plate member (3); The sealing groove (1.6) contains a sealing member (6) which is elastic and is squeezed by the cover plate member (3) and the housing (1).

9. The water flow sensor according to claim 8, characterized in that: The sealing groove (1.6) is an annular groove arranged around the disassembly and assembly port (1.4), and the sealing member (6) is an annular member arranged to match the annular groove.

10. Gas water heater, characterized in that: The invention comprises a water flow sensor as claimed in any one of claims 1 to 9.

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