Time-limited current-limiting device and gas water heater comprising same

Abstract

The application discloses a time-limited flow limiting device and a gas water heater comprising the same, wherein the time-limited flow limiting device comprises a body, a flow limiting module and a moving module, a containing cavity is formed in the body and is communicated with the outside through a water inlet, the moving module is arranged in the containing cavity, and one end of the flow limiting module, which is away from the water inlet, is connected with the moving module; when the flow limiting module abuts against the inner wall of the water inlet, the moving module is configured to move away from the water inlet while rotating. The flow limiting module moves away from the water inlet under the driving of water flow. Since one end of the flow limiting module, which is away from the water inlet, is connected with the moving module, and the moving module moves away from the water inlet through the rotating movement, the movement of the moving module is not affected by the water pressure of the flow limiting module. The time-limited flow limiting device has the above structure, so that the time limitation of the flow limiting module can be controlled, and the accuracy of the time limitation of the time-limited flow limiting device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a time-limited flow limiting device and a gas water heater comprising the same. BACKGROUND

[0002] During use, the gas water heater often appears the situation of opening and closing water. After opening for a period of time, the pipeline is filled with hot water, but when the water is opened again, the pre-cleaning, ignition and transmission of fire need to be performed at the start, and only after these processes are completed can the combustion be performed according to the water temperature required by the user. Therefore, the user at the faucet end will feel that the water temperature is first hot (the hot water left in the pipeline before), then slowly cold (cold water appears during the ignition and transmission process), and then hot again (hot water burned according to the demand of the water heater). In addition, when the user opens the hot water faucet, the user may not want to use cold water, which will cause a large amount of cold water to be wasted during the waiting process for hot water to flow out. There are existing technologies for limiting the amount of water. For example, in the Chinese patent with application number 2022215374248, when limiting the flow through the flow limiting module, the flow limiting module abuts the water inlet, at this time the water flow enters the containing cavity through the flow limiting module, under the driving of the water flow, the flow limiting module moves upward so that the return spring is compressed. When the water flow is too large, the speed of pushing the flow limiting module to move upward will be faster, so that the time of moving the flow limiting module upward is affected by the change of external water pressure, and thus the flow limiting time of the flow limiting module cannot be accurately controlled. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defect that when the water flow is too large, the speed of pushing the flow limiting module to move upward will be faster, so that the time of moving the flow limiting module upward is affected by the change of external water pressure, and thus the flow limiting time of the flow limiting module cannot be accurately controlled in the prior art, and to provide a time-limited flow limiting device and a gas water heater comprising the same.

[0004] The present application solves the above technical problems by the following technical scheme:

[0005] The present application discloses a time-limited flow limiting device, which comprises a body, a flow limiting module and a movement module, a containing cavity is formed in the body, the containing cavity is communicated with the outside through a water inlet, the movement module is arranged in the containing cavity, one end of the flow limiting module away from the water inlet is connected with the movement module, and when the flow limiting module abuts against the inner wall of the water inlet, the movement module is configured to move away from the water inlet while rotating.

[0006] In this design, when the flow-limiting module is in operation, it rests against the inlet, connecting the inlet to the outlet via the flow-limiting module, the receiving cavity, and the outlet. At this time, driven by the water flow, the flow-limiting module moves away from the inlet. Since the end of the flow-limiting module away from the inlet is connected to the moving module, and the moving module achieves its movement away from the inlet through rotation, its movement is unaffected by upward thrust, and therefore unaffected by the inlet water pressure of the flow-limiting module. This structural design allows for control of the flow-limiting module's timing, improving the accuracy of the flow-limiting time of the time-limiting and flow-limiting device.

[0007] Preferably, the body and the motion module are threadedly connected, wherein the extension direction of the threads on the body and / or the motion module is the same as the motion direction of the motion module.

[0008] In this solution, the above-mentioned structural form is adopted, and the motion module can rotate and move away from the water inlet at the same time through the threaded connection. It has the characteristics of simple structure and is conducive to simplifying the structure of the time-limited and flow-limited device.

[0009] Preferably, the body has threads, and the motion module includes a moving part and a locking part, with the connecting end of the locking part rotatably connected to the moving part;

[0010] The included angle of the engaging end of the engaging component matches the thread angle, so that when the moving component moves away from the water inlet, the engaging end engages with the thread; when the moving component moves towards the water inlet, the engaging end disengages from the thread.

[0011] In this solution, the aforementioned structural form is adopted. The engaging end engages with the thread, allowing the engaging component to move along the direction of the thread. Driven by the engaging component, the moving component also moves along the direction of the thread, enabling the motion module to rotate while simultaneously moving away from the inlet. When the moving component moves towards the inlet to return to its initial position, the engaging end disengages from the thread, freeing the moving component from the constraint of the engaging component. This allows the moving component to quickly return to its initial position under the action of the reset component, saving time. Furthermore, this structural form is simple in design.

[0012] Preferably, the motion module further includes an elastic element, and the end of the engaging member away from the engaging end is connected to the body through the elastic element.

[0013] In this solution, using the aforementioned structural form, when the moving part moves away from the inlet, the upper surface of the thread provides pressure to the engaging end, and the frictional force generated between the engaging end and the upper surface causes the engaging part to move towards the stretching elastic element, thereby making the engaging part more tightly engaged with the thread, and thus allowing the engaging part to move along the direction of the thread's rotation. When the moving part moves towards the inlet, which is during the process of the motion module and the flow limiting module returning to their initial positions, the lower surface of the thread provides support force to the engaging end, and one component of the support force can compress the elastic element, allowing the engaging end to disengage from the thread. Thus, under the action of the reset element, the moving part and the flow limiting module can return to their initial positions.

[0014] Preferably, the motion module further includes multiple blades connected to the motion component, the water flow direction is at an angle to the extension direction of the blades, the water flow acts on the blades with a force, the force being at least along the radial direction of the motion component.

[0015] In this design, the blades rotate under the influence of water flow, which in turn drives the moving parts to rotate, thus achieving simultaneous rotation and movement away from the inlet. This structural design simplifies the structure of the time-limited and flow-limited device by enabling the movement of the moving parts solely through water. Furthermore, this structure eliminates the need for electricity, saving resources.

[0016] Preferably, the body includes a housing and a screw, the receiving cavity is formed inside the housing, the screw is disposed inside the receiving cavity and connected to the housing, and the screw is threadedly connected to the motion module;

[0017] The motion module has a placement cavity, and the screw is connected to the placement cavity through an opening, with the axial direction of the screw coinciding with the axial direction of the placement cavity.

[0018] In this design, when the motion module moves upward relative to the screw, the screw can enter the placement cavity, thus preventing the screw from interfering with the movement of the motion module and improving the reliability of the motion module's movement. Furthermore, the above structural design improves the compactness of the time-limited and current-limited device.

[0019] Preferably, the motion module has a protrusion at one end near the current limiting module that protrudes towards the current limiting module, and the protrusion abuts against the current limiting module.

[0020] In this design, the aforementioned structural form allows the water flow to exert an upward force on the flow-limiting module, causing it to move vertically and away from the inlet. The moving module is configured to rotate while simultaneously moving away from the inlet. Because the protrusion abuts against the flow-limiting module, the movements of the moving module and the flow-limiting module do not interfere with each other. Furthermore, the contact area between the protrusion and the flow-limiting module reduces the contact area between them, thereby decreasing the frictional force generated between them.

[0021] Preferably, the time-limiting and current-limiting device further includes an extension member, one end of which is connected to the motion module, and the other end of which extends toward the current-limiting module. The extension member forms an extension cavity, the protrusion is disposed in the extension cavity, and the current-limiting module is slidably disposed in the extension cavity.

[0022] In this solution, the above-mentioned structural form can be used to limit the movement of the motion module through the extension, thereby improving the stability of the current limiting module's movement.

[0023] Preferably, the time-limiting and current-limiting device further includes a reset module, which is disposed within the receiving cavity, and its two ends abut against the motion module and the body, respectively.

[0024] In this solution, the aforementioned structural form is adopted, with the two ends of the reset module abutting against the motion module and the main body respectively. This allows the reset component to provide a buffering effect for the motion module during movement, thereby providing a buffering force and preventing collisions between the motion module and the main body that could damage the motion module. When the motion module needs to return to its initial position, the reset component provides a restoring force, allowing the motion module and the current limiting module to quickly return to their original positions under the action of the reset module, thus enabling rapid repositioning for the next time.

[0025] Preferably, the reset part includes a reset member and a friction plate, one end of the reset member abuts against the body, and the other end of the reset member is connected to the friction plate;

[0026] The friction pad has multiple protrusions at one end near the motion module. The protrusions protrude from the friction pad toward the motion module and abut against the motion module.

[0027] In this solution, the above-mentioned structural form is adopted to reduce the contact area between the moving parts and the reset module, thereby reducing the friction force when the moving parts move.

[0028] Preferably, the time-limiting and flow-limiting device includes a water outlet, which is connected to the receiving cavity;

[0029] The flow limiting module includes a flow limiting spring, a top cover, and a movable component. The top cover is connected to the motion module and fits against the inner wall surface of the water inlet. The top cover has a flow limiting hole that communicates with the water inlet and the water outlet. The two ends of the flow limiting spring abut against the other ends of the movable component and the top cover, respectively. The movable component moves within the receiving cavity to adjust the size of the flow limiting hole.

[0030] In this solution, using the above-described structure, the movable component can slide within the receiving cavity under the propulsion of the water flow, thereby adjusting the size of the flow-limiting orifice. When the water flow increases, the movable component moves closer to the upper cover, causing the size of the flow-limiting orifice to decrease, thus controlling the water flow from the inlet to the outlet, ensuring that the water flow remains moderate and constant to achieve flow restriction.

[0031] Preferably, the receiving cavity includes a flow passage cavity, which is connected to and communicates with the water inlet along the movement direction of the flow limiting module, and the diameter of the flow passage cavity is larger than the diameter of the water inlet.

[0032] In this solution, the above-mentioned structure is adopted. When the flow limiting module moves to the flow passage, since the diameter of the flow passage is larger than the diameter of the water inlet, the flow limiting module loses its flow limiting function, thereby allowing the water heater's flow rate to return to normal.

[0033] The present invention also discloses a gas water heater, which includes the time-limiting and flow-limiting device described above.

[0034] In this design, when the flow-limiting module is in operation, it rests against the inlet, connecting the inlet to the outlet via the flow-limiting module, the receiving cavity, and the outlet. At this time, driven by the water flow, the flow-limiting module moves away from the inlet. Since the end of the flow-limiting module away from the inlet is connected to the moving module, and the moving module achieves its movement away from the inlet through rotation, its movement is unaffected by upward thrust, and therefore unaffected by the inlet water pressure of the flow-limiting module. This structural design allows for control of the flow-limiting module's timing, improving the accuracy of the flow-limiting time of the time-limiting and flow-limiting device.

[0035] The positive and progressive effects of this invention are as follows:

[0036] When the flow-limiting module is in operation, it rests against the inlet, connecting the inlet to the outlet via the flow-limiting module, the receiving cavity, and the outlet. At this time, driven by the water flow, the flow-limiting module moves away from the inlet. Since the end of the flow-limiting module away from the inlet is connected to the moving module, and the moving module achieves its movement away from the inlet through rotation, its movement is unaffected by upward thrust, and therefore unaffected by the inlet water pressure of the flow-limiting module. This structural design allows for control of the flow-limiting module's timing, improving the accuracy of the flow-limiting time of the time-limiting and flow-limiting device. Attached Figure Description

[0037] Figure 1 This is a first cross-sectional schematic diagram of the time-limited and current-limited device according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the time-limited and current-limited device according to an embodiment of the present invention;

[0039] Figure 3 This is an exploded view of the time-limiting and current-limiting device according to an embodiment of the present invention;

[0040] Figure 4 This is a second cross-sectional schematic diagram of the time-limited and current-limited device according to an embodiment of the present invention;

[0041] Figure 5 This is a third cross-sectional view of the time-limited and current-limited device according to an embodiment of the present invention;

[0042] Figure 6 for Figure 5 Enlarged diagram of the middle section;

[0043] Figure 7 This is a schematic diagram of the motion module according to an embodiment of the present invention;

[0044] Figure 8 This is a schematic diagram of a current limiting module according to an embodiment of the present invention;

[0045] Figure 9 This is a fourth cross-sectional view of the time-limited and current-limited device according to an embodiment of the present invention;

[0046] Figure 10 This is a fifth cross-sectional view of the time-limited and current-limited device according to an embodiment of the present invention;

[0047] Figure 11 for Figure 10 Enlarged diagram of the middle section;

[0048] Figure 12 This is a schematic diagram of a water heater according to an embodiment of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] Time-limiting and current-limiting device 1

[0051] Body 11

[0052] Casing 111

[0053] Screw 112

[0054] Outlet 113

[0055] Inlet 114

[0056] Reception cavity 115

[0057] Flow chamber 1151

[0058] Motion Module 12

[0059] Motion component 121

[0060] Leaf 122

[0061] Placement cavity 123

[0062] 124 protrusions

[0063] Card assembly 125

[0064] Connector 1251

[0065] Card-connected end 1252

[0066] Shaft 1253

[0067] Current limiting module 13

[0068] Top cover 131

[0069] Current limiting spring 132

[0070] Activity item 133

[0071] 134mm retaining ring

[0072] Top rod 135

[0073] Reset module 14

[0074] Reset component 141

[0075] Friction plate 142

[0076] 143 bumps

[0077] Extension 15

[0078] Extension cavity 151

[0079] Water heater 100 Detailed Implementation

[0080] The present invention will be described more clearly and completely below with reference to a preferred embodiment and the accompanying drawings.

[0081] like Figures 1 to 11 As shown, this embodiment provides a time-limited flow-limiting device 1, which includes a body 11, a flow-limiting module 13, and a motion module 12. A receiving cavity 115 is formed within the body 11, and the receiving cavity 115 is connected to the outside via an inlet 114. The motion module 12 is disposed within the receiving cavity 115. The end of the flow-limiting module 13 away from the inlet 114 is connected to the motion module 12. When the flow-limiting module 13 abuts against the inner wall of the inlet 114, the motion module 12 is configured to rotate while moving away from the inlet 114. Specifically, when the flow-limiting module 13 limits the flow, it abuts against the inlet 114, thereby connecting the inlet 114 to the outlet 113 via the flow-limiting module 13, the receiving cavity 115, and the outlet. At this time, driven by the water flow, the flow-limiting module 13 moves away from the inlet 114. Since the end of the flow-limiting module 13 furthest from the inlet 114 is connected to the motion module 12, and the motion module 12 moves away from the inlet 114 through rotational motion, the motion of the motion module 12 is unaffected by the upward thrust. That is, even if the flow-limiting module 13 applies an upward thrust to the motion module 12 during its movement, the motion module 12 will not move vertically under the action of the thrust, thus ensuring that the motion of the motion module 12 is not affected by the inlet water pressure of the flow-limiting module 13. This structural design allows for control of the flow-limiting time of the flow-limiting module 13, improving the accuracy of the flow-limiting time of the time-limiting and flow-limiting device 1.

[0082] The main body 11 and the motion module 12 are threadedly connected, and the main body 11 and the motion module 12 can be implemented in several ways. In the first implementation, only the main body 11 has threads, and the direction of the threads is the same as the direction of movement of the motion module 12. In the second implementation, only the motion module 12 has threads, and the direction of the threads is the same as the direction of movement of the motion module 12. In the third implementation, threads are formed on both the main body 11 and the motion module 12, and the direction of the threads is the same as the direction of movement of the motion module 12. Using the above structural form, the motion module 12 rotates while moving away from the inlet 114 through the threaded connection. This structure is simple and helps to simplify the structure of the time-limited flow-limiting device 1.

[0083] Please see Figure 1 , Figures 4-6 as well as Figures 9 to 11As shown, in this embodiment, the body 11 has threads. The motion module 12 includes a moving part 121 and a locking part 125. The connecting end 1251 of the locking part 125 is rotatably connected to the moving part 121. The included angle of the locking end 1252 matches the thread angle, so that when the moving part 121 moves away from the inlet 114, the locking end 1252 engages with the thread; when the moving part 121 moves towards the inlet 114, the locking end 1252 disengages from the thread. With the above structure, the locking end 1252 engages with the thread, allowing the locking part 125 to move along the direction of the thread. Thus, under the drive of the locking part 125, the moving part 121 can also move along the direction of the thread, enabling the motion module 12 to rotate while moving away from the inlet 114. That is, when the flow limiting module 13 limits the flow, the locking end 1252 is always engaged with the thread and moves along the direction of the thread. When the moving part 121 moves towards the inlet 114 to return to its initial position, the engaging end 1252 disengages from the thread, thus freeing the moving part 121 from the constraint of the engaging part 125. This allows the moving part 121 to return to its initial position as quickly as possible, saving time. In addition, the above-described structure is simple in design.

[0084] When the engaging end 1252 is engaged with the thread, the extension direction of the engaging member 125 from the connecting end 1251 to the engaging end 1252 is at an angle to both the axis 1253 and the radial direction of the time-limiting and flow-limiting device 1. Specifically, the connecting end 1251 is connected to the moving member 121, the engaging end 1252 extends towards the placement cavity 123, and the engaging member 125 from the connecting end 1251 to the engaging end 1252 extends obliquely upward.

[0085] Specifically, when the flow limiting module 13 limits the flow, i.e., when both the motion module 12 and the flow limiting module 13 move away from the inlet 114, the engaging end 1252 and the thread angle engagement prevent the engaging end 1252 from disengaging from the thread. This allows the engaging end 1252 to move along the direction of the thread, thereby causing the moving part 121 to rotate while moving away from the inlet 114. When the flow limiting ends and the flow limiting module 13 and the motion module 12 need to return to their initial positions, the engaging end 1252 is supported by the lower surface of the thread, and the component of the supporting force generates a force that compresses the elastic element, causing the engaging end 1252 to disengage from the thread. This allows the moving part 121 to return to its initial position under the action of the reset element 141.

[0086] In this embodiment, the first surface of the thread that contacts the lower surface of the engaging end 1252 extends downward at an angle from the root of the thread, and the second surface of the thread that contacts the upper surface of the engaging end 1252 is provided upward at an angle from the root of the thread, and the first and second surfaces form a thread angle. The aforementioned thread angle allows the engaging end 1252 to smoothly disengage from the thread during the process of the motion module 12 and the current limiting module 13 returning to their initial positions, preventing the thread from jamming the engaging end 1252.

[0087] The engaging component 125 includes a shaft 1253, and the connecting end 1251 and the moving component 121 are rotated and connected through the shaft 1253. In addition, the aforementioned match between the included angle of the engaging end 1252 and the thread angle means that the engaging end 1252 can normally disengage from the thread during the process of the moving module 12 and the current limiting module 13 returning to their initial state.

[0088] Figure 1 as well as Figure 11 As shown, the motion module 12 also includes an elastic element, and the end of the engaging member 125 away from the engaging end 1252 is connected to the body 11 through the elastic element. With this structure, when the motion member 121 moves away from the inlet 114, the upper surface of the thread provides pressure to the engaging end 1252, and the friction between the engaging end 1252 and the upper surface causes the engaging member 125 to move in the direction of stretching the elastic element, thus making the engaging member 125 more tightly engaged with the thread, allowing the engaging member 125 to move along the direction of the thread's rotation. When the motion member 121 moves closer to the inlet 114, which is during the process of the motion module 12 and the flow limiting module 13 returning to their initial positions, the lower surface of the thread provides support force to the engaging end 1252, and one component of this support force can compress the elastic element, allowing the engaging end 1252 to disengage from the thread. Thus, under the action of the reset member 141, the motion member 121 can return to its initial position.

[0089] In this embodiment, the elastic element is a spring; in other embodiments, the type of elastic element is not limited.

[0090] like Figure 1 , Figure 4 , Figure 5 as well as Figure 9 and Figure 10As shown, the motion module 12 also includes multiple blades 122 connected to the moving member 121. The water flow direction is at an angle to the extension direction of the blades 122, and the water flow exerts a force on the blades 122, with the force at least along the radial direction of the moving member 121. Specifically, under the action of the water flow, the blades 122 rotate, thereby driving the moving member 121 to rotate, thus achieving simultaneous rotation of the moving member 121 and movement away from the inlet 114. Using the above structure, the movement of the moving member 121 can be achieved through water drive, thus simplifying the structure of the time-limited flow-limiting device 1. Furthermore, the above structure can complete the movement of the moving member 121 without electricity, saving resources.

[0091] In actual use, when the user turns on the faucet, water flows into the receiving cavity 115 from the flow limiting module 13. The water flow into the receiving cavity 115 continues to move and comes into contact with the blade 122 after reaching the motion module 12, thereby driving the moving part 121 to move away from the water inlet 114.

[0092] The main body 11 includes a housing 111 and a screw 112. A receiving cavity 115 is formed inside the housing 111, and the screw 112 is disposed inside the receiving cavity 115 and connected to the housing 111. The screw 112 is threadedly connected to the motion module 12. A placement cavity 123 is formed on the motion module 12, and the screw 112 communicates with the placement cavity 123 through an opening. The axis 1253 of the screw 112 coincides with the axis 1253 of the placement cavity 123. In actual use, the screw 112 is connected to the upper end of the housing 111. Multiple engaging parts 125 are arranged circumferentially around the screw 112, improving the stability of the motion module 12's movement. The axis 1253 of the moving component 121 coincides with the axis 1253 of both the placement cavity 123 and the screw 112, and the diameter of the placement cavity 123 is larger than the diameter of the screw 112, thus allowing the engaging component 125 to be circumferentially arranged around the placement cavity 123. When the moving module 12 moves upward relative to the screw 112, the screw 112 can enter the placement cavity 123. The further away the engaging position of the engaging component 125 on the wall of the moving component 121 is from the inlet 114, the longer the placement cavity 123 at the screw 112 position. This prevents the screw 112 from interfering with the movement of the moving module 12, improving the reliability of the movement of the moving module 12. Furthermore, this structural design improves the compactness of the time-limited flow-limiting device 1.

[0093] Please see Figure 1 , Figures 4-6 as well as Figure 9 and Figure 10As shown, the end of the motion module 12 near the flow-limiting module 13 has a protrusion 124 that protrudes towards the flow-limiting module 13, and the protrusion 124 abuts against the flow-limiting module 13. Specifically, the water flow drives the flow-limiting module 13 to move vertically, allowing the flow-limiting module 13 to move away from the inlet 114; while the motion module 12 is configured to move away from the inlet 114 while performing rotational motion. Because the protrusion 124 abuts against the flow-limiting module 13, the movements of the motion module 12 and the flow-limiting module 13 do not interfere with each other. In addition, the contact area between the protrusion 124 and the flow-limiting module 13 is reduced, thereby reducing the magnitude of the frictional force generated between the motion module 12 and the flow-limiting module 13.

[0094] In practical use, the current limiting module 13 moves vertically, while the motion module 12 rotates along the thread direction. Because the protrusion 124 abuts against the current limiting module 13, the motion module 12 will not cause the current limiting module 13 to rotate.

[0095] The time-limiting and current-limiting device 1 also includes an extension member 15. One end of the extension member 15 is connected to the motion module 12, and the other end of the extension member 15 extends towards the current-limiting module 13. The extension member 15 forms an extension cavity 151, and a protrusion 124 is disposed within the extension cavity 151. The current-limiting module 13 is slidably disposed within the extension cavity 151. With the above-described structure, the movement of the motion module 12 can be limited by the extension member 15, thereby improving the stability of the movement of the current-limiting module 13.

[0096] In this embodiment, the extension 15 is disposed at one end of the moving member 121 near the current limiting module 13, and the direction of the axis 1253 of the extension coincides with the direction of the axis 1253 of the moving member 121.

[0097] Please see Figure 1 , Figures 4-6 as well as Figures 9 to 11 As shown, the time-limiting and current-limiting device 1 also includes a reset module 14, which is disposed within the receiving cavity 115. Both ends of the reset module 14 abut against the motion module 12 and the body 11, respectively. Specifically, the two ends of the reset module 14 abut against the motion module 12 and the body 11, respectively, so that when the motion module 12 moves, the reset component 141 can provide a buffering effect for the motion module 12, thereby providing a buffering force to prevent collision between the motion module 12 and the body 11 and damage to the motion module 12. When the motion module 12 needs to return to its initial position, the reset component 141 can provide a restoring force for the movement of the motion module 12, thereby allowing the motion module 12 and the current-limiting module 13 to quickly return to their original positions under the action of the reset component 141, thus enabling rapid re-limiting.

[0098] The reset section includes a reset member 141 and a friction plate 142. One end of the reset member 141 abuts against the body 11, and the other end of the reset member 141 is connected to the friction plate 142. The friction plate 142 has multiple protrusions 143 at the end near the motion module 12. The protrusions 143 protrude from the friction plate 142 towards the motion module 12 and abut against the motion module 12. This structure reduces the contact area between the moving member 121 and the reset module 14, thereby reducing the frictional force during the movement of the moving member 121.

[0099] In practical use, both the reset piece 141 and the friction plate 142 are sleeved on the screw 112, thereby improving the compactness of the structure.

[0100] In this embodiment, the reset member 141 is a reset spring. In other embodiments, the reset member 141 may also be in other forms, which are not limited here.

[0101] The time-limiting and flow-limiting device 1 includes an outlet 113, which is connected to the receiving cavity 115; please refer to Figure 8 To understand the concept, the flow-limiting module 13 includes a flow-limiting spring 132, an upper cover 131, and a movable component 133. The upper cover 131 is connected to the motion module 12 and fits against the inner wall of the inlet 114. The upper cover 131 has a flow-limiting hole that communicates with the inlet 114 and the outlet 113. The two ends of the flow-limiting spring 132 abut against the other ends of the movable component 133 and the upper cover 131, respectively. The movable component 133 moves within the receiving cavity 115 to adjust the size of the flow-limiting hole. Specifically, the upper cover 131 is tightly fitted against the inner wall of the inlet 114, so that water does not bypass the flow-limiting component when flowing, but passes through the inside of the flow-limiting component, thereby achieving the flow-limiting effect. The flow-limiting orifice in the upper cover 131 is used to allow water to flow through the internal flow-limiting component. The movable part 133, propelled by the water flow, gradually approaches the upper cover 131. As the movable part 133 approaches, the space between it and the upper cover 131 decreases, thus reducing the size of the flow-limiting orifice. Because the thrust from the water flow is greater when the water flow is larger, the movable part 133 can move closer to the upper cover 131. The smaller the size of the flow-limiting orifice when the water flow is larger ensures that the flow rate of water passing through the orifice remains constant per unit time, achieving the effect of flow restriction. Using this structure, the movable part 133 can slide within the receiving cavity 115 under the propulsion of the water flow, thereby adjusting the size of the flow-limiting orifice. When the water flow is larger, the movable part 133 moves closer to the upper cover 131, further reducing the size of the flow-limiting orifice, thus controlling the water flow from the inlet 114 to the outlet 113, ensuring that the water flow remains moderate and constant, achieving flow restriction.

[0102] In this embodiment, the water outlet 113 is located on the screw 112, which improves the compactness of the structure.

[0103] The movable component 133 includes a movable cover and a flow restrictor. The end of the upper cover 131 facing the water inlet 114 has a sliding cavity. The movable cover extends into and moves within the sliding cavity. One end of the flow restrictor is connected to the movable cover, and the other end extends into a flow-limiting orifice. The movable cover slides relative to the upper cover 131 under the influence of water flow. The flow restrictor is fixed to the movable cover, and the flow restrictor and movable cover move together. The flow restrictor moves closer to the upper cover 131 under the action of the movable cover. The distance between the flow restrictor and the upper cover 131 is proportional to the size of the flow-limiting orifice. When the movable cover is subjected to a larger water flow, the flow restrictor moves closer to the upper cover 131. As the distance between the flow restrictor and the upper cover 131 decreases, the size of the flow-limiting orifice decreases. When the water flow is larger, the movable cover moves closer to the upper cover 131, and the size of the flow-limiting orifice 201 decreases, thus keeping the water flow rate through the flow-limiting orifice constant per unit time, achieving the flow restriction effect on the water entering the gas water heater 100.

[0104] The inner wall of the inlet 114 is provided with a retaining ring 134 for abutting against the flow limiting module 13. The retaining ring 134 abuts against the flow limiting module 13. When the switch is closed and no water flows through, the reset module 14 will reset the motion module 12 and the flow limiting module 13. Due to the effect of potential energy, after the reset module 14 completes the reset, the flow limiting module 13 may detach from the housing 111 and fall outside. The retaining ring 134 limits the flow limiting module 13 so that it can be blocked inside the receiving cavity 115.

[0105] The current limiting module 13 also includes a push rod 135, one end of which is connected to the upper cover 131, and the other end of which extends toward the motion module 12. The end of the push rod 135 away from the upper cover 131 extends into the extension cavity 151 and abuts against the protrusion 124.

[0106] The receiving cavity 115 includes a flow passage cavity 1151, which is connected to the water inlet 114 along the movement direction of the flow limiting module 13. The diameter of the flow passage cavity 1151 is larger than the diameter of the water inlet 114. With the above structure, when the flow limiting module 13 moves to the flow passage cavity 1151, since the diameter of the flow passage cavity 1151 is larger than the diameter of the water inlet 114, the flow limiting module 13 loses its flow limiting function, thereby allowing the flow rate of the water heater 100 to return to normal.

[0107] In practical implementation, when there is initially no water flow, the motion module 12 and the flow-limiting module 13 are both at the bottom under the action of the reset module 14. The water inlet 114 can only communicate with the inside of the receiving cavity 115 through the flow-limiting module 13. When the user turns on the hot water tap, the water can only flow into the water heater 100 through the flow-limiting module 13. The flow-limiting module 13 can limit the maximum flow rate to a very small flow rate, which is assumed to be about 2L / min, through the designed stiffness and pre-compression of the flow-limiting spring 132. Once the water flow sensor on the water heater 100 detects a flow rate of 2L / min, the water heater 100 starts the pre-cleaning, ignition, and flame transfer process. At this time, the flow-limiting module 13 will be subjected to the pressure and flow of the water, generating an upward force that pushes against the protrusion 124 of the motion module 12. The very small flow rate through the flow-limiting module 13 will flush the upper blades 122. Under the impact of the water flow, the blade 122 drives the moving part 121 to rotate, thereby causing the engaging part 125 on the moving part 121 to rotate upward along the direction of the thread and press against the reset part 141. The flow limiting module 13 moves upward along with the moving module 12 under the action of water pressure. Since the flow limiting module 13 is in point contact with the protrusion 124, the flow limiting module 13 will not rotate with the moving module 12. Finally, the flow limiting module 13 will move into the flow passage 1151. After the flow limiting module 13 moves into the flow passage 1151, the inlet water will mainly flow to the outlet 113 through the channels of the flow passage 1151 on both sides. At this time, the flow limiting module 13 loses its flow limiting function, and the flow rate of the water heater 100 returns to normal. Since the moving module 12 has also moved to the top of the screw 112, it will no longer rotate upward even under the impact of the water flow.

[0108] Since the thread lead angle of the screw 112 is designed to ensure self-locking, the rotational motion of the motion module 12 is largely unaffected by the upward thrust, i.e., unaffected by the inlet water pressure acting on the flow-limiting module 13. Therefore, the entire upward motion time of the motion module 12 is primarily determined by the water flow rate through the flow-limiting module 13, the structure of the motion module 12, the structure of the screw 112, and the structure of the reset component 141. Because the water flow rate through the flow-limiting module 13 can be designed using its structure, the upward motion time can be precisely controlled during structural design. This allows for more accurate control of the flow-limiting time during hot water operation, largely unaffected by changes in external water pressure. This time can generally be controlled to 7 seconds. Within this time, the water heater 100 can complete the pre-cleaning, ignition, and flame transfer processes. During the re-outflow of water, the temperature drop is significantly reduced due to the small cold water flow rate during the pre-cleaning, ignition, and flame transfer processes. When a user turns on the hot water tap for the first time, the amount of cold water flowing from the tap will be significantly reduced during the pre-cleaning, ignition, and flame transmission processes of the water heater 100 (because users often waste the cold water flowing from the hot water tap), thus achieving the goal of saving water resources. After the water heater 100 completes its startup process, and the subsequent valves open and the flow rate returns to normal, the flame can quickly adjust the load to maintain constant-temperature combustion.

[0109] When the user turns off the hot water tap, due to the lack of water flow, the motion module 12, under the action of the reset component 141, generates a downward force. At this time, the motion component 121 drives the engaging component 125 to squeeze the elastic component, allowing the engaging component 125 to quickly disengage from the threads on the screw 112. This causes the motion module 12 to quickly move the flow limiting module 13 downward, returning it to its lowest position. The hot water flow limiting module 13 then returns to its initial state.

[0110] like Figure 12 As shown, this embodiment also provides a gas water heater 100, which includes a time-limiting and flow-limiting device 1. Specifically, when the flow-limiting module 13 limits the flow, the flow-limiting module 13 abuts against the water inlet 114, thereby connecting the water inlet 114 to the water outlet 113 through the flow-limiting module 13 and the receiving cavity 115. At this time, driven by the water flow, the flow-limiting module 13 moves away from the water inlet 114. Since the end of the flow-limiting module 13 away from the water inlet 114 is connected to the motion module 12, and the motion module 12 achieves its own movement away from the water inlet 114 through rotational movement, the movement of the motion module 12 is not affected by the upward thrust, and thus the movement of the motion module 12 is not affected by the water pressure of the inlet of the flow-limiting module 13. By adopting the above structural form, the time-limiting of the flow-limiting module 13 can be controlled, improving the accuracy of the flow-limiting time of the time-limiting and flow-limiting device 1.

[0111] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A time-limited and current-limited device, characterized in that, The time-limiting and flow-limiting device includes a main body, a flow-limiting module, and a motion module. The main body has a receiving cavity, which is connected to the outside through a water inlet. The motion module is located inside the receiving cavity. The end of the flow-limiting module away from the water inlet is connected to the motion module. When the flow-limiting module abuts against the inner wall of the water inlet, the motion module is configured to rotate while moving away from the water inlet. The direction of the force exerted by the current limiting module on the motion module is parallel to the axis of the motion module; The body and the motion module are threadedly connected, wherein the extension direction of the threads on the body and / or the motion module is the same as the motion direction of the motion module; The body has threads, and the motion module includes a moving part and a locking part, with the connecting end of the locking part rotatably connected to the moving part. The included angle of the engaging end of the engaging component matches the thread angle, so that when the moving component moves away from the water inlet, the engaging end engages with the thread; when the moving component moves towards the water inlet, the engaging end disengages from the thread.

2. The time-limited and current-limited device as described in claim 1, characterized in that, The motion module also includes an elastic element, and the end of the engaging member away from the engaging end is connected to the body through the elastic element.

3. The time-limited and current-limited device as described in claim 1, characterized in that, The motion module also includes multiple blades connected to the motion component. The direction of water flow is at an angle to the extension direction of the blades. The water flow acts on the blades with a force, which is at least along the radial direction of the motion component.

4. The time-limited and current-limited device as described in claim 1, characterized in that, The main body includes a housing and a screw. The receiving cavity is opened inside the housing. The screw is disposed inside the receiving cavity and connected to the housing. The screw is threadedly connected to the motion module. The motion module has a placement cavity, and the screw is connected to the placement cavity through an opening, with the axial direction of the screw coinciding with the axial direction of the placement cavity.

5. The time-limited and current-limited device as described in claim 1, characterized in that, The motion module has a protrusion at one end near the current limiting module that protrudes towards the current limiting module, and the protrusion abuts against the current limiting module.

6. The time-limited and current-limited device as described in claim 5, characterized in that, The time-limiting and current-limiting device also includes an extension member, one end of which is connected to the motion module, and the other end of which extends toward the current-limiting module. The extension member forms an extension cavity, the protrusion is disposed in the extension cavity, and the current-limiting module is slidably disposed in the extension cavity.

7. The time-limited and current-limited device as described in claim 1, characterized in that, The time-limiting and current-limiting device also includes a reset module, which is located inside the receiving cavity, and its two ends abut against the motion module and the body, respectively.

8. The time-limited and current-limited device as described in claim 7, characterized in that, The reset module includes a reset component and a friction plate. One end of the reset component abuts against the body, and the other end of the reset component is connected to the friction plate. The friction pad has multiple protrusions at one end near the motion module. The protrusions protrude from the friction pad toward the motion module and abut against the motion module.

9. The time-limited and current-limited device as described in claim 1, characterized in that, The time-limiting and flow-limiting device includes a water outlet, which is connected to the receiving cavity; The flow limiting module includes a flow limiting spring, a top cover, and a movable component. The top cover is connected to the motion module and fits against the inner wall surface of the water inlet. The top cover has a flow limiting hole that communicates with the water inlet and the water outlet. The two ends of the flow limiting spring abut against the other ends of the movable component and the top cover, respectively. The movable component moves within the receiving cavity to adjust the size of the flow limiting hole.

10. The time-limited and current-limited device as described in claim 1, characterized in that, The receiving cavity includes a flow passage cavity, which is connected to and communicates with the water inlet along the movement direction of the flow limiting module. The diameter of the flow passage cavity is larger than the diameter of the water inlet.

11. A gas-fired water heater, characterized in that, The gas water heater includes a time-limiting and flow-limiting device as described in any one of claims 1-10.

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