Flow-limiting non-return device and water outlet device

Abstract

The flow-limiting non-return device comprises a main body and a flow limiting piece, the main body comprises a flow channel, the flow channel comprises a water inlet and a water outlet, the water passing area of the flow channel is gradually reduced in the water inlet direction, and the flow limiting piece is arranged in the flow channel and comprises a diaphragm part and a shaft part capable of elastically deforming in the water inlet direction; the diaphragm part is arranged at the end, close to the water inlet, of the shaft part and comprises a bendable skirt edge, water flow can flow into the flow channel from the water inlet to impact the diaphragm part so that the skirt edge can be bent in the direction opposite to the water inlet, the shaft part can be deformed and compressed, the diaphragm part can move in the direction away from the water inlet, and the diaphragm part is matched with the gradually-shrunk flow channel to achieve flow limiting. When water flows into the flow channel from the water outlet, the diaphragm part can be impacted to enable the skirt edge to seal the flow channel. According to the current-limiting non-return device, the current-limiting non-return function can be achieved only through one current-limiting piece, multiple parts do not need to be used in cooperation, the structure is simple, and assembling is convenient and fast.

Description

Technical Field

[0001] The invention relates to the field of valve components, and in particular to a flow limiting and non-return device and a water outlet device. Background Art

[0002] At present, flow limiting check valves are often installed in products such as shower heads, faucets and angle valves to control water flow. However, in some existing technologies, flow limiting check valves have many parts. For example, elastic parts and blocking parts need to cooperate with each other, and O-rings are needed to prevent water from flowing back while limiting the flow. There are many parts and the structure is complicated, and the assembly process is not convenient. Summary of the invention

[0003] The present invention proposes a flow limiting and anti-return device and a water outlet device, aiming to solve the technical problems in the prior art that the flow limiting and anti-return device has many parts, a complex structure, and an inconvenient assembly process.

[0004] To achieve the above objectives, a first aspect of the present invention provides a current limiting and anti-return device, comprising: The main body comprises a flow channel, wherein the flow channel comprises a water inlet and a water outlet, and the water flow area of ​​the flow channel gradually decreases along the water inlet direction; A flow limiting member, arranged in the flow channel, comprising a diaphragm portion and a shaft portion elastically deformable along the water inlet direction, wherein the diaphragm portion is arranged at one end of the shaft portion close to the water inlet, and the diaphragm portion comprises a bendable skirt; When water flows from the water inlet into the flow channel, it can impact the diaphragm portion to cause the skirt to bend in a direction away from the water inlet, while causing the shaft portion to deform and compress, so that the diaphragm portion moves in a direction away from the water inlet; When water flows from the water outlet into the flow channel, it may impact the diaphragm portion so that the skirt closes the flow channel.

[0005] According to the flow limiting and anti-return device provided by the embodiment of the first aspect of the present invention, the movable setting of the diaphragm part can be realized by using the shaft part that can be elastically deformed and compressed along the water inlet direction, and the actual water flow area is reduced as the water flow increases by using the flow channel with a gradually shrinking water flow area to achieve effective flow limiting. At the same time, the skirt on the diaphragm part can also block the reverse flow of water to achieve anti-return. The flow limiting and anti-return function can be achieved by only using one flow limiting part, without the need for the use of multiple parts, and the structure is simple and easy to assemble.

[0006] According to some embodiments of the present invention, the diaphragm portion is bowl-shaped, and the opening of the diaphragm portion faces away from the water inlet. When no water flows into the flow channel or water flows into the flow channel from the water outlet, the skirt abuts against the inner wall of the flow channel.

[0007] According to some embodiments of the present invention, the diaphragm portion includes a connecting portion and a deformation portion, the skirt is connected to the connecting portion via the deformation portion, and a side of the connecting portion facing away from the skirt is connected to the shaft portion.

[0008] According to some embodiments of the present invention, a water retaining ring extends from a side of the connecting portion close to the water inlet.

[0009] According to some embodiments of the present invention, a cylindrical portion parallel to the water inlet direction is provided in the shaft portion.

[0010] According to some embodiments of the present invention, the main body further includes a rod portion parallel to the water inlet direction, and the rod portion is inserted into the cylinder portion.

[0011] According to some embodiments of the present invention, a sealing ring extends from the inner wall of the cylinder in a direction close to the water inlet, and when the rod is inserted into the cylinder, the sealing ring abuts against the outer peripheral wall of the rod.

[0012] According to some embodiments of the present invention, at least one second annular groove is provided on the inner peripheral wall of the barrel portion.

[0013] According to some embodiments of the present invention, the main body includes a shell and a cover, and the rod is disposed on an end of the cover close to the shell.

[0014] A second aspect of the present invention provides a water outlet device, including: the above-mentioned flow limiting and anti-return device.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 The overall schematic diagram of the current limiting and anti-return device provided by the embodiment of the present invention is shown; Figure 2 The exploded schematic diagram of the current limiting and anti-return device provided by the embodiment of the present invention is shown; Figure 3 A schematic diagram of the structure of a current limiting component provided by an embodiment of the present invention is shown; Figure 4 A schematic diagram of the structure of a current limiting and anti-return device provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a current limiting and anti-return device provided in an embodiment of the present invention is shown; Figure 6A schematic diagram of the structure of a current limiting and anti-return device provided in an embodiment of the present invention is shown; Reference numerals: 1000. Current limiting and anti-return device; 100, main body; 110, cover; 111, water inlet; 112, rod; 120, shell; 121, flow channel; 122, baffle; 1221, water outlet; 1222, rod hole; 123, sealing groove; 200, flow limiting member; 210, diaphragm portion; 211, skirt; 212, deformation portion; 213, first annular groove; 214, connecting portion; 215, water retaining ring; 220, shaft portion; 221, cylinder portion; 222, sealing ring; 223, second annular groove; 300. Sealing ring. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] refer to Figure 2 and Figure 4 In some specific embodiments of the present invention, a flow limiting and non-return device 1000 is provided, which can be arranged in a water outlet device such as a shower, a faucet, an angle valve, etc., to limit the flow of the water outlet device and control the water flow closure. A sealing groove 123 can be provided on the outer wall of the flow limiting and non-return device 1000, and a sealing ring 300 can be sleeved therein, so that the flow limiting and non-return device 1000 can be sealed when installed in the water outlet device to prevent water from leaking from the outer wall of the device.

[0019] refer to Figure 1-4 In some specific embodiments of the present invention, a flow limiting and anti-return device 1000 is provided, comprising a main body 100 and a flow limiting member 200. The main body 100 comprises a cover 110 and a shell 120. One end of the shell 120 is provided with a water outlet 1221, and the other end is provided with an opening. The cover 110 is provided on the opening to cover the shell 120. A flow channel 121 is provided in the shell 120. A water inlet 111 is hollowed out on the cover 110. Thus, after the cover 110 and the shell 120 are covered, water can enter the flow channel 121 from the water inlet 111 and flow out from the water outlet 1221. The water flow area of ​​the flow channel 121 gradually decreases along the water inlet direction, that is, the inner wall of the shell 120 gradually shrinks from the end close to the water inlet 111 to the end close to the water outlet 1221.

[0020] The flow limiting member 200 is arranged in the flow channel 121 of the shell 120, and the flow limiting member 200 includes a diaphragm portion 210 and a shaft portion 220 that are connected to each other. The diaphragm portion 210 is arranged on one end of the shaft portion 220 close to the water inlet 111. The shaft portion 220 can undergo elastic deformation along the water inlet direction, and a bendable skirt 211 is arranged on the diaphragm portion 210.

[0021] Thus, when water flows from the water inlet 111 into the flow channel 121, it impacts the diaphragm portion 210, so that the skirt 211 bends in the direction away from the water inlet 111, and the water can pass through the space between the skirt 211 and the inner wall of the flow channel 121 and flow out from the water outlet 1221 (such as Figure 5 At the same time, when the water flow impacts the diaphragm portion 210, the shaft portion 220 is also impacted by the water flow, so that the shaft portion 220 is deformed and compressed in the direction away from the water inlet 111 (such as Figure 6 , the dotted line with an arrow in the figure is a schematic representation of water flow), thereby, the diaphragm portion 210 will also be pulled by the shaft portion 220 to move in the direction close to the water outlet 1221. When the water flow is larger, the impact force is larger, the degree of deformation and compression of the shaft portion 220 is higher, and the diaphragm portion 210 is closer to the water outlet 1221. Since the water flow area of ​​the flow channel 121 gradually decreases along the water inlet direction, the closer the diaphragm portion 210 is to the water outlet 1221, the smaller the water flow area between the skirt 211 and the inner wall of the flow channel 121. Therefore, even if the water flow is larger, the flow limiting and non-return device 1000 of the embodiment of the present invention can control the flow rate passing through by reducing the water flow area, thereby realizing the flow limiting function.

[0022] When water flows from the water outlet 1221 into the flow channel 121, under the impact of the water flow, the skirt 211 no longer bends, but opens and clings to the inner wall of the flow channel 121 (such as Figure 4 ), thereby closing the flow channel 121 to prevent reverse water flow from polluting the water source and the water inlet channel, thereby achieving a non-return function.

[0023] According to the flow limiting and non-return device 1000 provided in the embodiment of the present invention, the movable setting of the diaphragm part 210 can be realized by using the shaft part 220 that can be elastically deformed and compressed along the water inlet direction, and the flow channel 121 with a gradually shrinking water flow area cooperates with the diaphragm part 210, so that the area available for water flow to pass through decreases as the water flow increases, thereby effectively limiting the water flow rate. At the same time, the skirt 211 on the diaphragm part 210 can also block the reverse flow of water to achieve non-return. The flow limiting and non-return device 1000 of the embodiment of the present invention can achieve the flow limiting and non-return function by using only one flow limiting member 200, without the need for the use of multiple parts such as springs, and has a simple structure and convenient assembly.

[0024] refer to Figure 3 and Figure 4In some specific embodiments of the present invention, the diaphragm portion 210 is roughly bowl-shaped, and the opening of the bowl-shaped diaphragm portion 210 faces away from the water inlet 111, that is, the side of the diaphragm portion 210 close to the water inlet 111 is a convex arc surface, and the side facing away from the water inlet 111 is a concave arc surface, and the arc surface area of ​​any side is larger than the maximum water inlet cross-sectional area of ​​the flow channel 121. When no water flows into the flow channel 121, the skirt 211 opens naturally and abuts against the inner wall of the flow channel 121. When water flows into the flow channel 121 from the water outlet, the skirt 211 is impacted by the water flow. Under the support of the inner wall of the flow channel 121, the skirt 211 fits tightly against the inner wall of the flow channel 121 to seal the flow channel and prevent the water entering from the water outlet 1221 from flowing to the water source and causing pollution.

[0025] It can be understood that the diaphragm portion 210 is bowl-shaped with its opening facing away from the water inlet 111, and in a natural state, the skirt 211 is opened and abuts against the inner wall of the flow channel 121, and the skirt 211 is supported by the inner wall of the flow channel 121. Therefore, when water flows into the flow channel 121 from the water outlet 1221, even if the diaphragm portion 210 is impacted by the water flow, the skirt 211 is difficult to bend in the direction close to the water inlet 111.

[0026] In some specific embodiments of the present invention, the diaphragm portion 210 also includes a connecting portion 214 and a deformation portion 212, wherein the skirt 211 is connected to the connecting portion 214 through the deformation portion 212, and the side of the connecting portion 214 facing away from the skirt 211 is connected to the shaft portion 220, thereby realizing the connection between the diaphragm portion 210 and the shaft portion 220.

[0027] It is particularly pointed out here that the shaft portion 220, the connecting portion 214, the deformation portion 212 and the skirt 211 can be formed separately and then assembled and connected in sequence, or can be integrally formed, or the skirt 211, the deformation portion 212 and the connecting portion 214 can be integrally formed and then assembled and connected to the shaft portion 220, which is not limited here.

[0028] In this embodiment, the deformation portion 212 can be designed in shape or selected in material so that its hardness is significantly lower than that of the shaft portion 220, the connecting portion 214 and the skirt 211. Therefore, when the diaphragm portion 210 is subjected to force due to the impact of water flow, the deformation portion 212 is easier to deform, so that the skirt 211 can bend relative to the connecting portion 214.

[0029] refer to Figure 3In some embodiments of the present invention, the connection portion 214, the deformation portion 212 and the skirt 211 are integrally formed of an elastic material, wherein a first annular groove 213 is provided between the connection portion 214 and the skirt 211, and the portion having a smaller thickness than the connection portion 214 and the skirt 211 is the deformation portion 212. When water flows impact the diaphragm portion 210, the stress generated at the deformation portion 212 having a smaller thickness is greater, and thus the deformation occurs first, so that the skirt 211 bends in a direction beyond the water inlet 1221, thereby forming a water passage between the deformation portion 212 and the inner wall of the flow channel 121, so that the water flows through. Moreover, no matter how the impact force of the water flow changes, the deformation portion 212 always deforms first.

[0030] In some prior arts, the diaphragm is not provided with a corresponding deformation part, so when the water flow impacts, the diaphragm is subjected to force as a whole, and only when the water flow impact generates a large pressure value, the diaphragm can be deformed as a whole to expose the water flow channel. Compared with the above-mentioned prior arts, the flow limiting and anti-return device 1000 provided by the present invention is more likely to deform under the same water flow impact due to the special design of the deformation part 212, so that the skirt 211 is bent to expose the water flow channel. Therefore, it can be deformed to pass water even under lower water pressure, and can well adapt to the use environment of low water pressure, avoiding the situation where the water pressure is low and water cannot be discharged.

[0031] refer to Figure 3 In some specific embodiments of the present invention, a water retaining ring 215 extends from one side of the connecting portion 214 close to the water inlet 111. It is understandable that the water retaining ring 215 and the connecting portion 214 together form a bowl-shaped structure with an opening toward the water inlet 111. When water flows from the water inlet 111 to impact the diaphragm portion 210, the impact force of the water flow can be more concentrated, and most of the water flow can be prevented from flowing directly from both sides of the diaphragm portion 210, so that the water flow can impact the diaphragm portion 210 more efficiently, thereby making the shaft portion 220 more prone to deformation and compression.

[0032] refer to Figure 3 and Figure 4 In some specific embodiments of the present invention, a cylindrical portion 221 parallel to the water inlet direction is provided in the shaft portion 220. Specifically, the shaft portion 220 is configured to be hollow, that is, a cylindrical space is hollowed out in the middle of the shaft portion 220 along the water inlet direction.

[0033] In this embodiment, the hollow shaft portion 220 is designed to save the material of the flow limiting member 200, and the thickness of the peripheral wall of the shaft portion 220 is smaller, so that the stress generated by the shaft portion 220 in the water inlet direction can be more concentrated, so that deformation and compression can be more easily caused, and even the peripheral wall of the cylinder portion 221 itself can be slightly bent and deformed along the water inlet direction (such as Figure 6), so that the movement stroke of the diaphragm portion 210 is longer, and flow limiting can be achieved within a larger flow change range.

[0034] It should be pointed out that the “parallel to the water inlet direction” defined here does not mean that the barrel 221 and its peripheral wall are completely parallel to the water inlet direction, but that they are roughly parallel. For example, the peripheral wall of the barrel 221 can gradually shrink or expand along the water inlet direction at an angle. As long as the thickness of the peripheral wall of the shaft 220 can be reduced to concentrate stress and make deformation and compression easier to occur, no limitation is made here.

[0035] refer to Figure 2 and Figure 4 In some specific embodiments of the present invention, the main body 100 also includes a rod portion 112 parallel to the water inlet direction. Specifically, the rod portion 112 is arranged on a side of the cover body 110 close to the shell body 120. When the cover body 110 and the shell body 120 are covered, the rod portion 112 is inserted into the cylinder portion 221.

[0036] According to the flow limiting and anti-return device 1000 provided in the embodiment of the present invention, by setting the rod portion 112, when the device is assembled, the rod portion 112 can be inserted into the cylinder portion 221, so as to limit and guide the deformation and compression process of the shaft portion 220, so as to avoid the problem of excessive impact force of the water flow or the impact angle of the water flow, which may cause the shaft portion 220 to deviate or even bend in a direction perpendicular to the water inlet direction, thereby causing the diaphragm portion 210 to tilt and abut against the inner wall of the flow channel 121, thereby causing interference and stagnation, affecting the normal working process of the flow limiting component 200.

[0037] refer to Figure 3 and Figure 4 In some specific embodiments of the present invention, the inner wall of the cylinder 221 extends in a direction close to the water inlet 111 and forms a sealing ring 222. When the rod 112 is inserted into the cylinder 221, the sealing ring 222 abuts against the outer wall of the rod 112. Figure 3 The opening of the sealing ring 222 gradually decreases from the barrel 221 toward the water inlet 111. It can be understood that the area of ​​the smallest opening of the sealing ring 222 is the same as the cross-sectional area of ​​the rod 112, or the cross-sectional area of ​​the smallest opening of the sealing ring 222 can be smaller than the cross-sectional area of ​​the rod 112, so that the end of the sealing ring 222 close to the water inlet 111 can be interference fit with the outer peripheral wall of the rod 112.

[0038] According to the flow limiting and anti-return device 1000 provided by the embodiment of the present invention, the sealing ring 222 and the outer peripheral wall of the rod 112 can be closely abutted to achieve sealing of the barrel 221, so that the water flow cannot flow through the gap between the outer peripheral wall of the rod 112 and the inner peripheral wall of the barrel 221, and the tension of the water flowing into the gap is prevented from causing the inner peripheral wall of the shaft 220 and the outer peripheral wall of the rod 112 to be tightly attracted to each other, thereby affecting the shaft 220 from being deformed and compressed, and also preventing the impact water flow from leaking out of the gap and causing pressure relief, thereby reducing the impact and pushing effect of the water flow on the flow limiting member 200. In addition, since the sealing ring 222 is inclined to abut against the outer wall of the rod 112, when the water flow is larger, the water flow pressure on the outer wall of the sealing ring 222 is larger, so that the sealing ring 222 abuts against the outer wall of the rod 112 more closely, and the sealing effect is better, thereby preventing the sealing ring 222 from being flushed open by the water flow with a larger pressure and causing sealing failure.

[0039] refer to Figure 3 and Figure 4 In some specific embodiments of the present invention, at least one second annular groove 223 is provided on the inner circumferential wall of the cylinder portion 221 .

[0040] In an embodiment of the present invention, the inner wall of the cylinder 221 is further hollowed out to form a second annular groove 223, so that the thickness of the cylinder wall at the second annular groove 223 becomes smaller. Therefore, the shaft 220 is subjected to greater stress under the impact of water flow, and is more likely to bend or even fold, thereby making the movement stroke of the diaphragm portion 210 longer, and achieving flow limiting within a larger flow change range.

[0041] It can be understood that multiple second annular grooves 223 can be provided, and multiple second annular grooves 223 can be parallel to each other, or even multiple second annular grooves 223 can be connected in sequence along the water inlet direction, so as to further increase the deformation of the shaft portion 220 and the stroke of the diaphragm portion 210, thereby improving the flow limiting effect.

[0042] refer to Figure 1 and Figure 4 In some specific embodiments of the present invention, a baffle 122 is provided on the end of the housing 120 facing away from the cover 110, and the plane where the baffle 122 is located is perpendicular to the water inlet direction. The baffle 122 is hollowed out with a water outlet 1221 and a rod hole 1222, and the position of the rod hole 1222 corresponds to the position of the rod 112 after the cover 110 and the housing 120 are assembled, so that the end of the rod 112 facing away from the cover 110 can be inserted into the rod hole 1222 to complete the docking.

[0043] In an embodiment of the present invention, when the cover body 110 is covered on the shell 120, one end of the rod 112 can be inserted into the rod hole 1222, so as to facilitate the accurate docking of the cover body 110 and the shell 120 during assembly. At the same time, the rod hole 1222 can also limit the movement of the rod 112 to prevent it from shaking left and right in the flow channel 121, thereby causing interference between the flow limiting component 200 and the inner wall of the flow channel 121.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description of reference terms such as "some specific embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A current limiting and anti-return device, characterized in that: include: The main body comprises a flow channel, wherein the flow channel comprises a water inlet and a water outlet, and the water flow area of ​​the flow channel gradually decreases along the water inlet direction; A flow limiting member, arranged in the flow channel, comprising a diaphragm portion and a shaft portion elastically deformable along the water inlet direction, wherein the diaphragm portion is arranged at one end of the shaft portion close to the water inlet, and the diaphragm portion comprises a bendable skirt; When water flows from the water inlet into the flow channel, it can impact the diaphragm portion to cause the skirt to bend in a direction away from the water inlet, while causing the shaft portion to deform and compress, so that the diaphragm portion moves in a direction away from the water inlet; When water flows from the water outlet into the flow channel, it may impact the diaphragm portion so that the skirt closes the flow channel.

2. The current limiting and anti-return device according to claim 1, characterized in that: The diaphragm portion is bowl-shaped, and the opening of the diaphragm portion faces away from the water inlet. When no water flows into the flow channel or water flows into the flow channel from the water outlet, the skirt abuts against the inner wall of the flow channel.

3. The current limiting and anti-return device according to claim 1, characterized in that: The diaphragm portion includes a connecting portion and a deformation portion, the skirt is connected to the connecting portion via the deformation portion, and the connecting portion is connected to the shaft portion at a side facing away from the skirt.

4. The current limiting and anti-return device according to claim 3, characterized in that: A water retaining ring extends from one side of the connecting portion close to the water inlet.

5. The current limiting and anti-return device according to claim 1, characterized in that: The shaft portion is provided with a cylindrical portion parallel to the water inlet direction.

6. The current limiting and anti-return device according to claim 5, characterized in that: The main body also includes a rod portion parallel to the water inlet direction, and the rod portion is inserted into the cylinder portion.

7. The current limiting and anti-return device according to claim 6, characterized in that: A sealing ring extends from the inner wall of the cylinder in a direction close to the water inlet. When the rod is inserted into the cylinder, the sealing ring abuts against the outer peripheral wall of the rod.

8. The current limiting and anti-return device according to claim 6, characterized in that: At least one second annular groove is arranged on the inner peripheral wall of the cylinder.

9. The current limiting and anti-return device according to claim 6, characterized in that: The main body comprises a shell and a cover, and the rod is arranged on one end of the cover close to the shell.

10. A water outlet device, characterized in that: It comprises a current limiting and anti-return device as described in any one of claims 1 to 9.

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