Circulating water circuit components and foot baths

Abstract

The present invention discloses a circulating water circuit component and a foot bath, and relates to the technical field of foot baths. The circulating water circuit component includes a circulating pipe, an anti-backflow structure and a heating component. The heating component includes a heating tube. The circulating pipe is connected with the heating tube to form a circulation channel. The anti-backflow structure is installed on the circulating pipe, and the anti-backflow structure is located upstream of the heating component along the water flow direction, and is used to limit the water and / or steam heated by the heating tube from reversely passing through the anti-backflow structure and flowing to the water inlet end of the circulation channel. Therefore, high-temperature water and / or steam cannot reversely pass through the anti-backflow structure and flow to the water inlet end, thereby preventing users from being scalded. The foot bath includes a circulating water circuit component and a barrel body. The circulating pipe of the circulating water circuit component is connected with a foot bath cavity in the barrel body. Since the anti-backflow structure is provided on the circulating water circuit component, high-temperature water and / or steam cannot reversely pass through the anti-backflow structure. Therefore, water and / or steam cannot enter the foot bath cavity from the water inlet end, thereby preventing users from being scalded.

Description

Technical Field

[0001] The present invention relates to the technical field of foot baths, and mainly relates to a circulating water circuit component and a foot bath. Background Art

[0002] In order to maintain a constant temperature of the footbath water, the existing footbath is usually provided with a circulation component, which includes a heating component. The water in the footbath cylinder is heated by the heating component of the circulation component and then returns to the footbath cylinder.

[0003] In existing foot baths, when the water inlet end of the circulation component is blocked and the water supply is not smooth, the water pump continues to work, draining the water in the heating component in the circulating water circuit, and the heating component continues to heat. The temperature in the heating component is too high, and the water in the barrel sporadically enters the heating component and instantly spurts out high-temperature hot water from the circulating water inlet. Since the circulating water inlet is close to the foot placement area, the high-temperature steam sprayed from the circulating water inlet can easily scald the user's feet. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a circulating water circuit assembly and a foot bath to solve the problem that high-temperature water and / or steam generated at the heating assembly flows back to the water inlet end, thereby causing users to be easily scalded.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A circulating water circuit assembly comprises a circulating pipe, an anti-backflow structure and a heating assembly, wherein the heating assembly comprises a heating pipe, the circulating pipe is connected to the heating pipe, and forms a circulation channel, wherein the circulation channel is used for the circulation of water; the front end of the circulation channel is a water inlet end, and the rear end of the circulation channel is a water outlet end; the anti-backflow structure is installed on the circulating pipe, and the anti-backflow structure is located upstream of the heating assembly along the water flow direction, and is used to limit the water and / or steam heated by the heating pipe from flowing back through the anti-backflow structure to the water inlet end.

[0007] In some embodiments of the present application, a buffer inner cavity is provided on the circulation channel, and the buffer inner cavity is located downstream of the heating component along the water flow direction; the circulation channel between the heating tube and the buffer inner cavity is called the first channel, and the cross-sectional area of ​​the first channel is smaller than the cross-sectional area of ​​the buffer inner cavity.

[0008] In some embodiments of the present application, the ratio of the flow rate of water flowing through the first channel per unit time to the volume of the buffer inner cavity is 1:200-1:400.

[0009] In some embodiments of the present application, the anti-backflow structure includes an anti-backflow cover, which can swing relative to the circulation pipe to open or close the circulation pipe. The anti-backflow cover can be opened by the driving force of water when water flows from the water inlet end to the water outlet end; and can be reset to close under the action of a reset member, or closed under the driving force of water or steam flowing from the water outlet end to the water inlet end.

[0010] In some embodiments of the present application, the anti-backflow structure also includes a first limiting member, which abuts against the first limiting member when the anti-backflow cover is in the closed position. The first limiting member limits the anti-backflow cover from flipping toward the water inlet end. When the anti-backflow cover is in the open position, there is a gap between at least one side of the anti-backflow cover and the inner wall surface of the circulation pipe for water to pass through.

[0011] In some embodiments of the present application, the anti-backflow structure further includes a second limiting member. When the anti-backflow cover is in the open position, the anti-backflow cover abuts against the second limiting member, and the angle between the anti-backflow cover in the closed position and the anti-backflow cover in the open position is an acute angle.

[0012] In some embodiments of the present application, the second limiting member is a protruding block provided in the circulation pipe, and the protrusion is provided on a side where the backflow prevention cover is in an open position.

[0013] In some embodiments of the present application, the anti-backflow structure also includes a mounting ring, which is fixed on the circulation pipe. The anti-backflow cover is connected to the mounting ring, and the anti-backflow cover can swing relative to the mounting ring. The mounting ring is located on the outside of the anti-backflow cover. When the anti-backflow cover is in the closed position, the anti-backflow cover is abutted against one side of the mounting ring, so that a rib protruding toward the anti-backflow cover is formed on the mounting ring, and the rib forms the first limiting member.

[0014] In some embodiments of the present application, the circulation pipeline also includes a circulation joint, which is provided with a second channel and a drainage channel, the drainage channel is connected to the second channel, and one end of the second channel is connected to the heating pipe; the circulation water circuit assembly also includes a filtering structure, which is arranged at the intersection of the drainage channel and the second channel, and when water flows from the second channel to the heating pipe, it passes through the filtering structure, and when water flows from the second channel to the drainage channel, the water passes through the outer surface of the filtering structure, and the anti-backflow structure is arranged on the second channel of the circulation joint, and the anti-backflow structure is located at the end of the second channel away from the heating pipe.

[0015] A foot bath comprises a barrel body and a circulating water circuit assembly, wherein the barrel body has a foot bath cavity, the circulating water circuit assembly is connected to the foot bath cavity, a circulating water outlet is provided at the lower part of the foot bath cavity, and the water inlet of the circulating water circuit assembly is connected to the circulating water outlet.

[0016] In some embodiments of the present application, the foot bath also includes a water pump, a circulating water inlet is provided on the side of the barrel body, the water inlet end of the water pump is connected to the water outlet of the circulating water circuit assembly, the water outlet end of the water pump is connected to the circulating water inlet, and the circulating water outlet and the circulating water inlet are both connected to the foot bath cavity.

[0017] In some embodiments of the present application, the anti-backflow structure includes an anti-backflow cover, which can swing relative to the circulation pipe to open or close the circulation pipe, and the anti-backflow cover can be opened by the driving force of water when water flows from the water inlet end to the water outlet end; and reset to close under the action of a reset member, or closed under the driving force of water or steam flowing from the water outlet end to the water inlet end; the anti-backflow structure also includes a first limiting member, which abuts against the first limiting member when the anti-backflow cover is in the closed position, and the first limiting member limits the anti-backflow cover from flipping toward the water inlet end. When the anti-backflow cover is in the open position, there is a gap between at least one side of the anti-backflow cover and the inner wall surface of the circulation pipe for water to pass through; wherein, a circulation outlet joint is provided at the bottom of the foot bath chamber, and a circulation water outlet is provided at the first end of the circulation outlet joint extending toward the water inlet end, and the end wall of the first end of the circulation outlet joint serves as the first limiting member.

[0018] Beneficial effect: The circulating water circuit assembly of the present application includes a circulating pipe, an anti-backflow structure and a heating assembly, the heating assembly includes a heating pipe, the circulating pipe is connected to the heating pipe, and forms a circulation channel, the anti-backflow structure is installed on the circulating pipe, and the anti-backflow structure is located upstream of the heating assembly along the water flow direction, and is used to limit the water and / or steam heated by the heating pipe from flowing back through the anti-backflow structure to the water inlet end, therefore, high-temperature water and / or steam cannot flow back through the anti-backflow structure to the water inlet end, to prevent scalding of users.

[0019] The circulating water circuit assembly is connected to the barrel body of the foot bath, and a circulating water outlet is provided at the lower part of the foot bath cavity in the barrel body. The water inlet of the circulating water circuit assembly is connected to the circulating water outlet. The circulating water circuit assembly is provided with an anti-backflow structure upstream of the heating assembly along the water flow direction, which is used to limit the water and / or steam heated by the heating pipe from reversely passing through the anti-backflow structure and flowing to the water inlet end. High-temperature water and / or steam cannot reversely pass through the anti-backflow structure. Therefore, high-temperature water and / or steam cannot enter the foot bath cavity from the water inlet end, so as to prevent scalding the user's feet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the circulating water circuit component.

[0021] Figure 2 yes Figure 1 A top view schematic diagram of the circulating water circuit assembly is shown.

[0022] Figure 3 yes Figure 2 The cross-sectional view of the circulating water circuit assembly in the AA direction, wherein the control valve is in a closed state and the arrow indicates the direction of water flow.

[0023] Figure 4 yes Figure 2 The cross-sectional view of the circulating water circuit assembly in the AA direction, wherein the control valve is in the open state and the arrow indicates the direction of water flow.

[0024] Figure 5 yes Figure 2 The cross-sectional view of the circulating water circuit assembly in the BB direction, wherein the control valve is in a closed state and the arrow indicates the direction of water flow.

[0025] Figure 6 yes Figure 2 The cross-sectional view of the circulating water circuit assembly in the BB direction, wherein the control valve is in the open state and the arrow indicates the direction of water flow.

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the circulation joint.

[0027] Figure 8 It is an exploded diagram of the filtration structure.

[0028] Figure 9 It is a schematic diagram of the three-dimensional structure of the heating component.

[0029] Figure 10 It is a top view schematic diagram of the anti-backflow structure.

[0030] Figure 11 yes Figure 10 The cross-sectional view of the backflow prevention structure in the CC direction is shown, wherein the backflow prevention cover is in a closed state.

[0031] Figure 12 yes Figure 10 The cross-sectional view of the anti-backflow structure in the CC direction is shown, wherein the anti-backflow cover is in the open state.

[0032] Figure 13 This is an exploded diagram of the circulating water circuit components.

[0033] Figure 14It is a schematic diagram of the cross-sectional structure of a foot bath.

[0034] Figure 15 yes Figure 14 A local enlarged schematic diagram at point D.

[0035] Explanation of main component symbols: 110 - buffer tube, 111 - buffer inner cavity, 120 - elbow, 131 - first channel, 211 - first connecting portion, 212 - limiting groove, 140 - circulation joint, 141 - second channel, 142 - water inlet, 143 - water outlet, 144 - drainage channel, 145 - installation cavity, 146 - gap, 147 - first positioning member, 148 - water cavity, 149 - drainage through hole;

[0036] 200-heating assembly, 210-heating tube, 220-heater;

[0037] 300 - anti-backflow structure, 310 - anti-backflow cover, 320 - second limiter, 330 - rotating shaft, 340 - mounting ring, 341 - retaining edge;

[0038] 400 - filtration structure, 410 - filter screen, 420 - inner cylinder, 421 - water hole, 422 - second positioning member, 423 - connecting member, 424 - baffle;

[0039] 500-control valve, 510-solenoid valve body, 520-sealing plate;

[0040] 10-circulating water circuit assembly, 20-water pump, 30-barrel body, 31-circulating water outlet, 32-circulating water inlet, 33-foot bath cavity, 35-circulating water outlet connector. DETAILED DESCRIPTION

[0041] The present invention provides a circulating water circuit assembly and a foot bath. To make the purpose, technical solution, and effects of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 on the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] See Figure 14 , the circulating water circuit assembly 10 can be applied to a foot bath. When the circulating water circuit assembly 10 is applied to a foot bath, since the foot bath includes a barrel body 30, a foot bath cavity 33 is provided inside the barrel body 30, a circulating water outlet 31 is provided at the bottom of the barrel body 30, and a circulating water inlet 32 ​​is provided on the side of the barrel body 30. The circulating water outlet 31 and the circulating water inlet 32 ​​are both connected to the foot bath cavity 33, the water inlet end of the circulating water circuit assembly 10 is connected to the circulating water outlet 31 at the bottom of the barrel body 30, and the water outlet end of the circulating water circuit assembly 10 is connected to the circulating water inlet 32 ​​on the side of the barrel body 30. Therefore, the water inside the barrel body 30 returns to the inside of the barrel body 30 after passing through the circulating water circuit assembly 10, forming an internal circulation. The water refers to water used for foot bath or a mixture of water and medicine, etc. Water does not belong to the technical features included in this application. It is only for the convenience of stating the structure of this application. The "upstream" and "downstream" recorded in this application are all reference to the flow direction of water in the circulating water circuit assembly 10.

[0046] See Figure 1-4 and Figure 13-14 A circulating water circuit assembly 10 includes a circulating pipe and a heating assembly 200. The heating assembly 200 includes a heating tube 210. The circulating pipe is connected to the heating tube 210 to form a circulation channel, and the circulation channel is used for the circulation of water. The front end of the circulation channel is the water inlet end, and the rear end of the circulation channel is the water outlet end. The "front" and "rear" are determined according to the direction of the water flow, that is, the water flows from the front end of the circulation channel to the rear end of the circulation channel. After the circulating pipe is installed on the barrel body 30 of the foot bath, the water inlet end of the circulation channel is connected to the circulating water outlet 31 of the barrel body 30, and the water outlet end of the circulation channel is connected to the circulating water inlet 32 ​​of the barrel body 30. Therefore, the water in the barrel body 30 returns to the interior of the barrel body 30, that is, the foot bath cavity 33, after passing through the circulating pipe, forming an internal circulation.

[0047] Specifically, a buffer cavity 111 is provided in the circulation channel. The heating assembly 200 is provided in the circulation pipe. The buffer cavity 111 is located downstream of the heating assembly 200 in the direction of water flow. Downstream refers to the downstream direction of water flow when the water flows through the circulation pipe. This allows water heated by the heating assembly 200 to first enter the buffer cavity 111 and then flow back into the barrel body 30. The circulation channel between the heating assembly 200 and the buffer cavity 111 is called a first channel 131. The cross-sectional area of ​​the first channel 131 is smaller than that of the buffer cavity 111, allowing the buffer cavity 111 to store water.

[0048] When the water heated by the heating assembly 200 enters the buffer cavity 111 through the first channel 131, it mixes with the water stored in the buffer cavity 111. The water stored in the buffer cavity 111 is relatively cooler than the newly heated water. Therefore, the mixing of the water and the water cools the higher-temperature water, making the water entering the barrel 30 uniform in temperature. When the water is heated by the heating assembly 200 and generates steam, the steam mixes with the water stored in the buffer cavity 111, forming a liquid with a lower temperature, eliminating the steam and preventing the water flowing out of the water outlet from scalding the user's feet.

[0049] In the above, a buffer cavity 111 is set on the circulation channel of the circulation pipe. When the circulating water circuit component 10 is blocked in front of the buffer cavity 111 and the water inlet is not smooth, the water pump 20 used to drive the water flow continues to work and the heating component 200 used to heat the water continues to heat, resulting in a small amount of water being heated. In this case, the temperature of the heated water will be too high. When the water with too high a temperature is mixed with the water stored in the buffer cavity 111 in the buffer cavity 111, the temperature is reduced, so that the temperature of the water flowing out of the first channel 131 is uniform, and then enters the interior of the barrel body 30 from the circulating water inlet 32 ​​on the side of the barrel body 30 to avoid scalding the user.

[0050] Specifically, the circulation pipeline includes a buffer tube 110, and a buffer inner cavity 111 is provided inside the buffer tube 110, that is, the buffer tube 110 is part of the circulation pipeline. Setting the buffer tube 110 as an independent part can facilitate the setting of the buffer inner cavity 111, that is, facilitate the production of the buffer tube 110.

[0051] A bend 120 is provided on the buffer tube 110. The bend 120 is provided at one end of the buffer tube 110 away from the heating assembly 200. The bend 120 bends upward so that the water stored in the inner cavity of the buffer tube 110 will not flow out. Moreover, when there is steam in the buffer inner cavity 111, the resistance of the steam will increase when passing through the position of the bend 120, thereby ensuring that the steam will not directly enter the interior of the barrel body 30.

[0052] In one detailed embodiment, the ratio of the water flow rate through the first channel per unit time to the volume of the buffer cavity is 1:200-1:400. This range allows for sufficient water storage to reduce the high-temperature steam, while also ensuring that the buffer tube 110 is not excessively large, which would affect the overall size of the device and the assembly of other components.

[0053] See Figure 1-4 、 Figure 9 and Figure 13 The heating assembly 200 includes a heating tube 210 and a heater 220. The circulation pipe is connected to the heating tube 210. One end of the heating tube 210 is sealed with the buffer tube 110. The heater 220 is installed on the heating tube 210. The heater 220 can be fixed to the inner cavity of the heating tube 210, fixed to the outer surface of the heating tube 210, or embedded in the wall thickness of the heating tube 210. The heating tube 210 of the circulation pipe is set as an independent part to facilitate the installation of the heating assembly 200 on the circulation pipe. In the embodiment of the present application, the heater 220 is fixed to the inner cavity of the heating tube 210, so that the heater 220 can directly contact the water, that is, directly heat the water.

[0054] In a detailed embodiment, the heater 220 includes one or more combinations of a PTC heater, a graphene heater sheet, and a heating tube.

[0055] See Figure 1-6 and Figure 10-13 The circulating water circuit assembly also includes a backflow prevention structure 300, which is used to restrict water and / or steam from flowing backward through the anti-backflow structure 300. The anti-backflow structure 300 is installed on the circulating pipe and is located upstream of the heating assembly 200. It is used to restrict the water and / or steam heated by the heating tube 220 from flowing backward through the anti-backflow structure 300 and then flowing toward the water inlet. The anti-backflow structure 300 is set to prevent water from flowing through the anti-backflow structure 300 in one direction, that is, water can only flow from the water inlet to the water outlet of the circulating pipe and cannot flow backward through the anti-backflow structure 300. When there is only a small amount of water in the circulation pipe, the heating component 200 heats a small amount of water, which will cause the water temperature to be too high and / or the water can quickly generate high-temperature steam. Since the anti-backflow structure 300 is provided, the high-temperature water and / or steam cannot pass through the anti-backflow structure 300 in reverse, so the high-temperature water and / or steam cannot enter the barrel body 30 from the circulation outlet 31 of the barrel body 30, avoiding the problem of scalding the user.

[0056] The anti-backflow structure 300 includes an anti-backflow cover 310, which can swing relative to the circulation pipe. The circulation pipe is opened and closed by swinging the anti-backflow cover 310. The swinging of the anti-backflow cover 310 relative to the circulation pipe includes a closed position and an open position. When the anti-backflow cover 310 is in the closed position, the water inlet end of the circulation pipe is closed, that is, when the anti-backflow cover 310 is in the closed position, the anti-backflow cover 310 covers the water inlet end of the circulation pipe, so that water and / or steam cannot enter the foot bath cavity 33 of the barrel body 30 from the circulation water outlet 31 of the barrel body 30, thereby avoiding the problem of scalding the user.

[0057] When the anti-backflow cover 310 is in the open position, there is a gap between at least one side of the anti-backflow cover 310 and the inner wall of the circulation pipe for water to pass through, that is, when the anti-backflow cover 310 is in the open position, water can pass through the gap. The power source for driving the anti-backflow cover 310 to swing is the water in the footbath cavity 33, that is, the anti-backflow cover 310 can be opened by the driving force of water when water flows from the water inlet end to the water outlet end. The driving force of water includes the gravity of water or the impact force of water with a larger flow rate. When there is reverse flow of water or steam, the reverse flow refers to the flow from the water outlet end to the water inlet end. The reverse flow of water or steam will push the anti-backflow cover 310 to the closed position. Therefore, the anti-backflow structure 300 can prevent water or steam from entering the footbath cavity 33 of the barrel body 30 from the circulation water outlet 31. Among them, after the anti-backflow cover 310 swings from the open position to the closed position, the inner wall of the circulation pipe limits the anti-backflow cover 310 or a first limiting member for limiting the anti-backflow cover 310 is fixed on the circulation pipe.

[0058] In some embodiments, a reset member can be provided to drive the anti-backflow cover 310 to reset from an open position to a closed position. The reset member includes a spring or a counterweight. That is, when water flows into the circulation pipe, the gravity or impact force of the water overcomes the force applied by the reset member to reset the anti-backflow cover 310 to the closed position, thereby realizing that the anti-backflow cover 310 is in an open state. When there is no gravity of water (for example, the water in the foot bath cavity flows dry) or impact force (for example, the water pump used to drive the water flow stops working), the reset member causes the anti-backflow cover 310 to swing to a closed state.

[0059] The backflow prevention structure 300 also includes a first stopper. When the backflow prevention cover 310 is in the closed position, the backflow prevention cover 310 abuts against the first stopper, which restricts the backflow prevention cover 310 from swinging toward the water inlet, thereby preventing the backflow prevention cover 310 from opening in the opposite direction. Therefore, the backflow prevention cover 310 can remain in the position that closes the water inlet of the circulation pipe, indicating that the backflow prevention structure 300 is in the closed state.

[0060] In some embodiments, the anti-backflow structure 300 also includes a second limiter 320. The first limiter and the second limiter 320 are used to limit the swing stroke of the anti-backflow cover 310, that is, the anti-backflow cover can only swing between the first limiter and the second limiter 320. When the anti-backflow cover 310 is in the open position, the anti-backflow cover 310 abuts against the second limiting member 320, and the angle between the anti-backflow cover 310 in the closed position and the anti-backflow cover 310 in the open position is an acute angle, that is, the angle when the anti-backflow cover 310 is in the closed position is 0, and the angle between the anti-backflow cover 310 in the open position and the anti-backflow cover 310 in the closed position is θ, which is an acute angle, that is, 0<θ<90°. The anti-backflow cover 310 swings between the closed position and the open position, so the swing range of the anti-backflow cover 310 is between 0-θ. When the anti-backflow cover 310 is in the open position, if there is reverse flow of water or steam, it can impact the surface of the anti-backflow cover 310 on the side facing the second limiting member 320, thereby pushing the anti-backflow cover 310 to swing toward the closed position. The second limiting member 320 includes a protrusion provided on the inner wall of the circulation pipe.

[0061] This application Figure 12 In the embodiment, the angle θ between the closed position and the open position of the anti-backflow cover 310 is 45°. This allows the water or steam to have a larger contact area with the anti-backflow cover 310 when there is reverse flow, making it easier to push the anti-backflow cover 310 to swing toward the closed position. In other embodiments, the angle θ can also be 15°, 30°, 60°, 75°, etc.

[0062] The backflow prevention structure 300 also includes a mounting ring 340, which is fixed to the circulation pipe. The backflow prevention cover 310 is connected to the mounting ring 340, and the backflow prevention cover 310 can swing relative to the mounting ring 340. The mounting ring 340 is located on the outside of the backflow prevention cover 310. The mounting ring 340 is formed with a rib 341 protruding toward the backflow prevention cover 310. The rib 341 forms a first limiting member. When the backflow prevention cover 310 is in the closed position, the backflow prevention cover 310 abuts against the rib 341 to limit the backflow prevention cover 310 and prevent the backflow prevention cover 310 from flipping toward the water inlet end. In this embodiment, the backflow prevention cover 310 is installed on the mounting ring 340 to form an integral component, which is then installed in the circulation pipe, thereby making installation convenient.

[0063] In another embodiment, the anti-backflow cover 310 is connected to the circulation pipe, and the anti-backflow cover 310 and the circulation pipe can rotate relative to each other to achieve the connection of the anti-backflow cover 310, and a first limiting member for limiting the anti-backflow cover 310 is provided on the inner wall of the circulation pipe.

[0064] In a detailed embodiment, the backflow prevention structure 300 also includes a rotating shaft 330, and the number of the backflow prevention covers 310 is more than two. All the backflow prevention covers 310 are rotatably connected to the rotating shaft 330, and the rotating shaft 330 is connected to the mounting ring 340. When the backflow prevention cover 310 is in abutment with the first limit member, the water inlet end and the water outlet end are not connected, that is, the backflow prevention cover 310 is in a closed state. When there is reverse flow of water or steam, the reverse flow of water or steam impacts the side of the anti-backflow cover 310 away from the first limiter, causing all the anti-backflow covers 310 to swing to a position in the same plane and abut against the first limiter. When all the anti-backflow covers 310 are in the same plane, two or more anti-backflow covers 310 form a circle that matches the inner diameter of the circulation pipe, at least one anti-backflow cover 310 abuts against the first limiter, and all the anti-backflow covers 310 abut against each other on the side near the rotating shaft 330. All the anti-backflow covers 310 limit each other's continued swinging direction, so that the anti-backflow covers 310 are in a closed state, preventing reverse flow of water or steam from entering the barrel body 30, and avoiding the problem of scalding users.

[0065] In another detailed embodiment, the backflow prevention structure 300 includes a backflow prevention cover 310, a first stopper, and a second stopper 320. The backflow prevention cover 310 can rotate relative to the circulation pipe, allowing the backflow prevention cover 310 to swing downward to open or close the circulation pipe. The first stopper and the second stopper 320 are used to limit the swing stroke of the backflow prevention cover 310. The first stopper and the second stopper 320 are arranged on the inner wall of the circulation pipe, and the first stopper is arranged above the second stopper 320.

[0066] When the anti-backflow cover 310 abuts the first stopper, it blocks the water inlet of the circulation pipe, meaning the anti-backflow cover 310 is in a closed state. Furthermore, due to the obstruction of the first stopper, the anti-backflow cover 310 cannot continue to swing toward the circulation water outlet 31 of the barrel body 30. When the anti-backflow cover 310 abuts the second stopper 320, the anti-backflow cover 310 does not completely block the water inlet of the circulation pipe, allowing the water inlet and outlet of the circulation pipe to communicate. This means the anti-backflow cover 310 is in an open state, allowing water in the barrel body 30 to enter the circulation pipe. Among them, when the anti-backflow cover 310 abuts against the second limit piece 320, there is an angle between the anti-backflow cover 310 and the axis of the water inlet 142. When there is reverse flow of water or steam, the reverse flow of water or steam impacts the side of the anti-backflow cover 310 close to the second limit piece 320, thereby driving the anti-backflow cover 310 to swing in the closing direction and reach a closed state, preventing the reverse flow of water or steam from entering the barrel body 30, thereby avoiding the problem of scalding the user.

[0067] In detail, the first limiter includes a convex ring, which is arranged on the water inlet end of the circulation pipe or the mounting ring 340. The first limiter may also include a plurality of protrusions arranged on the circulation pipe or the mounting ring 340 and located on the same normal plane.

[0068] In some embodiments, the second limiting member 320 is a protruding block provided in the circulation pipe, and the protrusion is provided on the side where the backflow prevention cover is in the open position.

[0069] In detail, both ends of the protrusion are connected to the circulation pipe, and the length direction of the protrusion is parallel to the axial direction of the rotating shaft 330, so that when more than two anti-backflow covers 310 are swung to the position of the second limit piece 320, all anti-backflow covers 310 are in line contact or surface contact with the second limit piece 320, thereby improving the force balance of the anti-backflow cover 310 and avoiding damage caused by internal water impact.

[0070] Specifically, such as Figure 3-15 As shown, the backflow prevention cover 310 is composed of two semicircular pieces connected by a rotating shaft 330 to form a fully circular cover. When water flows from the water inlet to the water outlet, the two anti-backflow covers 310 can rotate relative to the rotating shaft 330 to open, connecting the water inlet and the water outlet. Typically, the anti-backflow covers 310 are opened by gravity due to the downward flow of water. After opening, the two anti-backflow covers 310 abut against the protrusions. Because the protrusions limit the anti-backflow covers 310 from opening too far, the anti-backflow covers 310 are easily reset to close. For example, when both anti-backflow covers 310 are opened to a substantially vertical angle, it is difficult for water or steam flowing in the opposite direction to push the anti-backflow covers 310 closed. When water or steam flows in the opposite direction from the water outlet to the water inlet, the two anti-backflow covers 310 are pushed closed by the driving force of the water or steam. Therefore, the backflow prevention cover 310 can be automatically opened or closed according to the working situation, does not require manual operation, and is easy to use.

[0071] In another embodiment, a reset member may be provided on the rotating shaft, for example, the reset member may be a reset spring. After the anti-backflow cover 310 is opened, when there is no gravity of water (for example, the water in the foot bath cavity flows out) or impact force (for example, the water pump used to drive the water flow stops working), the elastic force of the reset spring can reset the anti-backflow cover 310 and swing it to the closed state.

[0072] See Figure 3-8 and Figure 13The circulating water circuit component 10 also includes a filtering structure 400, which is installed on the circulating pipe and is arranged in front of the heating component 200. Therefore, the water entering the circulating water circuit component 10 is first filtered by the filtering component, and then passes through the heating component 200, the buffer cavity 111 and the water pump 20, to avoid the circulating water circuit component 10 from being blocked at the position of the heating component 200, the buffer cavity 111 or the water pump 20.

[0073] The circulation pipeline further includes a circulation joint 140. The flow channel on the circulation joint 140 is called a second channel 141. The second channel 141 includes at least two ports, one port is called a water inlet 142, and the other port is called a water outlet 143. The water outlet 143 is connected to the heating pipe 210. The filter structure 400 is placed in the second channel 141, and the filter structure 400 is arranged between the water inlet 142 and the water outlet 143. The circulation joint 140 is connected between the circulation outlet 31 of the barrel body 30 and the heating pipe 210, that is, the water inlet 142 of the circulation joint 140 is connected to the circulation outlet 31 of the barrel body 30, and the water outlet 143 of the circulation joint 140 is connected to the water inlet end of the heating pipe 210. This allows water in the barrel body 30 to enter the interior of the heating pipe 210 through the circulation joint 140 and contact with the heating assembly 200 to achieve heat exchange. The water then flows through the buffer cavity 111 and the water pump 20 and returns to the barrel body 30. Because the filter structure 400 is disposed within the second channel 141 of the circulation connector 140, when water enters the heating tube 210 through the second channel 141, impurities in the water are filtered by the filter structure 400, thereby preventing clogging of the circulating water circuit assembly 10 at the heating assembly 200, the buffer cavity 111, or the water pump 20. In this embodiment, the filter structure 400 can be a sponge, a filter mesh 410, or a combination of a sponge and a filter mesh 410.

[0074] In some embodiments, the circulation joint 140 further includes a drainage channel 144, which is in communication with the water channel. A control valve 500 is connected to the drainage channel 144, and the control valve 500 is used to control the on / off of the drainage channel 144. Therefore, when the water in the barrel body 30 needs to be drained, the control valve 500 is opened, and the water enters the circulation joint 140 from the circulation water outlet 31 of the barrel body 30 and is discharged through the drainage channel 144. Meanwhile, the water in the heating tube 130, the buffer cavity 111, and the water pump 20 can also enter the circulation joint 140 from the water outlet 143 and be discharged from the drainage channel 144. Therefore, the barrel body 30 does not need to be provided with a separate drainage port, which simplifies the structure.

[0075] The filter structure 400 is positioned at the intersection of the drainage channel 144 and the second channel 141. When water flows from the water inlet 142 to the water outlet 143, the water passes through the filter structure 400, thereby being filtered. This prevents blockage at the heating pipe 210, buffer pipe 110, and water pump 20 behind the circulation connector 140. When the water is discharged, the water flows from the water inlet 142 to the drainage channel 144. That is, after the control valve 500 is opened, the water can flow through the outer surface of the filter structure 400. At the same time, the water at the heating pipe 210, buffer pipe 110, and water pump 20 passes through the filter structure 400 in the opposite direction. Impurities filtered by the filter structure 400 before the water is discharged are also carried out by the water through the drainage channel 144, achieving automatic cleaning of the filter structure 400.

[0076] Furthermore, the backflow prevention structure 300 is provided on the water inlet 142 of the circulation joint 140 , so that the backflow prevention structure 300 can block water flowing in the reverse direction from the water outlet 143 and also block water flowing in the reverse direction from the drainage channel 144 .

[0077] In some embodiments, a mounting cavity 145 is provided on the circulation joint 140, and the mounting cavity 145 is arranged at the intersection of the drainage channel 144 and the second channel 141. The filter structure 400 is installed in the mounting cavity 145, and a gap 146 is formed between the outer surface of the filter structure 400 and the inner wall surface of the mounting cavity 145. The gap 146 can temporarily store impurities filtered by the filter structure 400. When water flows from the water inlet 142 to the drainage channel 144, the water can flow through the gap 146, and then the water washes away the impurities. Moreover, when draining, the outer surface of the filter structure 400 is the channel that water must pass through, which improves the flushing effect of water on the filter structure 400. Among them, by setting a gap 146 between the outer surface of the filter structure 400 and the inner wall surface of the installation cavity 145, water can enter the gap 146, that is, the water surrounds the entire circumferential outer surface of the filter structure 400, and then passes through the filter structure 400 and reaches the water outlet 143, thereby increasing the area of ​​the filter structure 400 used to filter water.

[0078] See Figure 9 and Figure 14 In the above description, the filter structure 400 includes a filter screen 410, which is installed in the installation cavity 145 and covers the water outlet 143. That is, the water reaching the water outlet 143 must be filtered by the filter screen 410. Here, the filter screen 410 is used as a structure for filtering water. The filter screen 410 is non-absorbent and easy to dry and clean, thereby preventing the filter structure 400 from mold.

[0079] Furthermore, the filter structure 400 includes an inner cylinder 420, at least one end of which is fixed to the circulation connector 140. The inner cylinder 420 is fixedly connected to the circulation connector 140 at the water outlet 143, so that one end of the inner cylinder 420 is placed within the installation cavity 145. The filter screen 410 is wrapped around the outer surface of the inner cylinder 420. The inner cylinder 420 has a water hole 421 formed in the inner cylinder 420, which connects the outer and inner walls of the inner cylinder 420, allowing water filtered by the filter screen 410 to enter the inner cylinder 420 and enter the heating tube 130 through the water outlet 143. During installation, the filter screen 410 is first fixed to the inner cylinder 420, and then fixed to the circulation connector 140, thereby completing the installation of the filter screen 410 and facilitating its installation. The inner cylinder 420 also provides support for the filter screen 410, improving its strength and extending its service life.

[0080] See Figure 3 and Figure 4 Furthermore, the circulation joint 140 is provided with a first positioning member 147, which is located on the wall of the installation cavity 145 away from the water outlet 143. A second positioning member 422 is provided at one end of the inner cylinder 420. The inner cylinder 420 can be inserted into the installation cavity 145 from the water outlet 143, and the second positioning member 422 cooperates with the first positioning member 147. After the inner cylinder 420 is inserted into the installation cavity 145, it is positioned in the middle of the installation cavity 145, forming a uniform gap 146 between the outer wall of the filter screen 410 and the inner wall of the installation cavity 145. After the inner cylinder 420 and the circulation joint 140 are fixed at the water outlet 143, the first positioning member 147 also supports the second positioning member 422, thereby improving the firmness of the installed filter structure 400.

[0081] In detail, the first positioning member 147 includes a first protruding ring, and the second positioning member 422 includes a second protruding ring. The inner diameter of the first protruding ring is equal to the outer diameter of the second protruding ring, so that the second protruding ring can be inserted into the first protruding ring to achieve positioning of the inner cylinder 420. In another detailed embodiment, the outer diameter of the first protruding ring is equal to the inner diameter of the second protruding ring, so that the second protruding ring can be inserted into the first protruding ring to achieve positioning of the inner cylinder 420.

[0082] Since the circulation channel includes the heating tube 210 and the circulation joint 140, the heating tube 210 is provided with a first connection portion 211, and the inner tube 420 is provided with a second connection portion. After the first connection portion 211 and the second connection portion are matched, the heating tube 210 and the inner tube 420 or the circulation joint 140 are fixed together. The first connection portion 211 and the second connection portion cooperate to form a seal, allowing water passing through the water outlet 143 to enter the heating tube 210 without leakage. Specifically, the first connection portion 211 includes a conical protrusion, and the second connection portion includes a groove provided at one end of the inner tube 420 near the water outlet 143. The conical protrusion can be inserted into the groove to form a seal. The heating tube 210 and the inner tube 420 or the circulation joint 140 can be fixedly connected by screws or snaps.

[0083] See Figure 3-4 and Figure 8-9 Furthermore, the inner tube 420 is provided with a connector 423, which extends toward one side of the heating tube 210 and is fixedly connected to the heating tube 210 at the connector 423. The arrangement of the connector 423 allows the connector 423 to extend to the outer side of the heating tube 130. Therefore, whether the heating tube 210 and the inner tube 420 are fixedly connected by screws or buckles, they can be easily connected. A limiting groove 212 is provided on the heating tube 210, and the connector 423 is placed in the limiting groove 212. The outer wall of the connector 423 is in contact with the inner wall of the limiting groove 212. Therefore, the position of the connector 423 is limited by the limiting groove 212, so that after the heating tube 210 and the inner tube 420 are fixed, the first connecting portion 211 and the second connecting portion also fit together and form a seal.

[0084] Similarly, the connector 423 can be provided on the heating tube 210, and the limiting groove 212 can be provided on the inner tube 420. That is, the heating tube 210 is further provided with a connector 423, which extends toward one side of the inner tube 420 and is fixedly connected to the inner tube 420 at the connector 423; the heating tube 210 is provided with a limiting groove 212, and the connector 423 is placed in the limiting groove 212, and the outer wall of the connector 423 is in contact with the inner wall of the limiting groove 212.

[0085] See Figure 7The circulation joint 140 is provided with a water flow cavity 148 below the installation cavity 145, and the water flow cavity 148 is communicated with the installation cavity 145. The drainage channel 144 is provided below the water flow cavity 148, and the drainage channel 144 is communicated with the water flow cavity 148, and a drainage through-hole 149 is formed between the drainage channel 144 and the water flow cavity 148. Therefore, the installation cavity 145, the water flow cavity 148 and the drainage channel 144 form a channel for water to be discharged. The control valve 500 includes a solenoid valve body 510 and a sealing plate 520. The solenoid valve body 510 is fixed on the circulation joint 140, and the sealing plate 520 is fixed to the output end of the solenoid valve body 510. When the output end of the solenoid valve body 510 is in an extended state, the sealing plate 520 abuts against the drainage through-hole 149 and forms a seal. In this embodiment, the solenoid valve body 510 is installed on the outside of the circulation joint 140, and the sealing plate 520 can extend into the drainage channel 144 and can rest on the drainage through hole 149, thereby facilitating the installation of the control valve 500 and the maintenance of the solenoid valve body 510.

[0086] In the above description, impurities filtered by the filter structure 400 can be temporarily stored in the water passage cavity 148 under the action of gravity. Therefore, the impurities will not cover the outer surface of the filter structure 400 and block the through holes of the filter structure 400. Moreover, when the water is discharged, the impurities filtered by the filter structure 400 can be discharged more easily. Preferably, the filter structure 400 includes one or more combinations of metal filter mesh, plastic filter mesh and fiber filter cartridge.

[0087] Because the solenoid valve body 510 is mounted on the outside of the circulation joint 140, in order for the sealing plate 520 to be able to seal the drainage hole 149, the drainage hole 149 must be located on the side opposite the solenoid valve body 510. Therefore, a corner must be formed between the water passage cavity 148 and the drainage channel 144. Therefore, an opening is provided in the water passage cavity 148 on the side near the water outlet 143 to facilitate mold removal during the production of the circulation joint 140. Therefore, the water passage cavity 148 is provided with an opening near the water outlet 143, and the opening is then sealed by the baffle 424 on the inner cylinder 420. Specifically, the inner cylinder 420 is provided with a baffle 424, which is positioned over the opening and capable of sealing the opening.

[0088] In the above, the circulation pipeline includes a circulation joint 140, a heating pipe 210, a buffer pipe 110 and a bend pipe 120 connected in sequence, thereby facilitating the installation of the filter structure 400 and the heating component 200, and also facilitating the production of the circulation waterway component 10.

[0089] See Figure 1-4 and Figure 13-14A foot bath includes a barrel body 30 and a circulating water circuit assembly 10; the barrel body 30 has a foot bath cavity 33, and the circulating water circuit assembly 10 is connected to the foot bath cavity 33. The water in the foot bath cavity 33 can return to the foot bath cavity 33 after passing through the circulating water circuit assembly 10, realizing internal circulation.

[0090] The foot bath also includes a water pump 20. A circulating water outlet 31 is provided at the lower part of the barrel body 30, and the water inlet 142 of the circulating water circuit assembly 10 is connected to the circulating water outlet 31; a circulating water inlet 32 ​​is provided on the side of the barrel body 30, and the water inlet end of the water pump 20 is connected to the water outlet 143 of the circulating water circuit assembly 10, and the water outlet end of the water pump 20 is connected to the circulating water inlet 32. Therefore, the barrel body 30, the circulating water circuit assembly 10 and the water pump 20 form a circulation channel, and the water pump 20 is used to drive the water flow, so that the water in the barrel body 30 can pass through the circulating water circuit assembly 10 and return to the barrel body 30.

[0091] See Figure 14 and Figure 15 A circulating water outlet connector 35 is provided at the bottom of the foot bath chamber 33, and a circulating water outlet 31 is provided at the first end of the circulating water outlet connector 35 extending toward the water inlet end, and the end wall of the first end of the circulating water outlet connector 35 serves as a first limiting member. When assembling the foot bath, the anti-backflow structure 300 is placed on the water inlet end of the circulation pipe, and then the water inlet end of the circulation pipe is connected to the circulating water outlet connector 35, and the anti-backflow structure 300 is restricted between the first end of the circulating water outlet connector 35 and the water inlet end of the circulation pipe. After the installation is completed, when the anti-backflow cover 310 of the anti-backflow structure 300 is in the closed position, at least one side of the anti-backflow cover 310 is against the end wall of the first end, so the end wall of the first end can serve as the first limiting member, and there is no need to additionally set up a structure as the first limiting member, which makes the structure simpler and convenient to produce.

[0092] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. A circulating water circuit assembly, characterized in that: The water heater comprises a circulation pipe, a backflow prevention structure and a heating assembly, wherein the heating assembly comprises a heating pipe, the circulation pipe is connected to the heating pipe, and forms a circulation channel for the circulation of water; the front end of the circulation channel is a water inlet end, and the rear end of the circulation channel is a water outlet end; The anti-backflow structure is installed on the circulation pipe and is located upstream of the heating component along the water flow direction, and is used to restrict the water and / or steam heated by the heating pipe from flowing back through the anti-backflow structure and flowing toward the water inlet end; The circulation pipeline also includes a circulation joint, the circulation channel on the circulation joint is called a second channel, the second channel includes a water inlet and a water outlet, the water outlet is connected to the heating pipe; the anti-backflow structure is provided on the water inlet of the circulation joint; The circulation joint further includes a drainage channel, wherein the drainage channel is communicated with the second channel; The circulation joint is provided with an installation cavity, and the installation cavity is arranged at the intersection of the drainage channel and the second channel; The circulation joint is provided with a water flow cavity below the installation cavity, the water flow cavity is communicated with the installation cavity, and the drainage channel is provided below the water flow cavity, the drainage channel is communicated with the water flow cavity; The circulating water circuit assembly also includes a filtering structure, which is arranged at the intersection of the drainage channel and the second channel. When water flows from the second channel to the heating pipe, it passes through the filtering structure. When water flows from the second channel to the drainage channel, the water passes through the outer surface of the filtering structure. Impurities filtered by the filtering structure can be temporarily stored in the water flow cavity under the action of gravity.

2. The circulating water circuit assembly according to claim 1, characterized in that: A buffer cavity is provided on the circulation channel, and the buffer cavity is located downstream of the heating component along the water flow direction; The flow channel between the heating tube and the buffer inner cavity is called a first channel, and the cross-sectional area of ​​the first channel is smaller than the cross-sectional area of ​​the buffer inner cavity.

3. The circulating water circuit assembly according to claim 2, characterized in that: The ratio of the flow rate of water flowing through the first channel per unit time to the volume of the buffer inner cavity is 1:200-1:

400.

4. The circulating water circuit assembly according to claim 1, characterized in that: The anti-backflow structure includes an anti-backflow cover, which can swing relative to the circulation pipe to open or close the circulation pipe. The anti-backflow cover can be opened by the driving force of water when water flows from the water inlet end to the water outlet end; and can be reset to close under the action of a reset member, or closed under the driving force of water or steam flowing from the water outlet end to the water inlet end.

5. The circulating water circuit assembly according to claim 4, characterized in that: The anti-backflow structure also includes a first limiting member, which abuts against the first limiting member when the anti-backflow cover is in the closed position. The first limiting member limits the anti-backflow cover from flipping toward the water inlet end. When the anti-backflow cover is in the open position, there is a gap for water to pass between at least one side of the anti-backflow cover and the inner wall surface of the circulation pipe.

6. The circulating water channel assembly according to claim 4 or 5, characterized in that: The backflow prevention structure further includes a second limiting member. When the backflow prevention cover is in the open position, the backflow prevention cover abuts against the second limiting member, and an angle between the backflow prevention cover in the closed position and the backflow prevention cover in the open position is an acute angle.

7. The circulating water circuit assembly according to claim 6, characterized in that: The second position-limiting member is a protruding block provided in the circulation pipe, and the protruding block is provided on a side where the backflow prevention cover is in the open position.

8. The circulating water circuit assembly according to claim 5, characterized in that: The anti-backflow structure also includes a mounting ring, which is fixed on the circulation pipe. The anti-backflow cover is connected to the mounting ring, and the anti-backflow cover can swing relative to the mounting ring. The mounting ring is located on the outside of the anti-backflow cover. When the anti-backflow cover is in the closed position, the anti-backflow cover is abutted against one side of the mounting ring, so that a rib protruding toward the anti-backflow cover is formed on the mounting ring, and the rib forms the first limiting member.

9. The circulating water circuit assembly according to claim 1, characterized in that: The backflow prevention structure is arranged on the second channel of the circulation joint, and the backflow prevention structure is located at an end of the second channel away from the heating pipe.

10. A foot bath, characterized in that: It comprises a barrel body and a circulating water circuit assembly as described in any one of claims 1 to 9, the barrel body having a foot bath cavity, the circulating water circuit assembly being connected to the foot bath cavity, a circulating water outlet being provided at the lower part of the foot bath cavity, and the water inlet of the circulating water circuit assembly being connected to the circulating water outlet.

11. The foot bath according to claim 10, characterized in that: It also includes a water pump. A circulating water inlet is provided on the side of the barrel body. The water inlet end of the water pump is connected to the water outlet of the circulating water circuit assembly, and the water outlet end of the water pump is connected to the circulating water inlet. The circulating water outlet and the circulating water inlet are both connected to the foot bath cavity.

12. The foot bath according to claim 10, characterized in that: The backflow prevention structure includes a backflow prevention cover, which can swing relative to the circulation pipe to open or close the circulation pipe. The backflow prevention cover can be opened by the driving force of water when water flows from the water inlet end to the water outlet end; and can be reset to close under the action of a reset member, or closed under the driving force of water or steam flowing from the water outlet end to the water inlet end. The backflow prevention structure further includes a first limiting member, which abuts against the first limiting member when the backflow prevention cover is in the closed position. The first limiting member limits the backflow prevention cover from turning toward the water inlet end. When the backflow prevention cover is in the open position, a gap for water to pass through is formed between at least one side of the backflow prevention cover and the inner wall surface of the circulation pipe. A circulating water outlet joint is provided at the bottom of the foot bath chamber, a circulating water outlet is provided at the first end of the circulating water outlet joint extending toward the water inlet end, and the end wall of the first end of the circulating water outlet joint serves as the first limiting member.

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