A current limiting device

Abstract

An embodiment of the present invention discloses a flow limiting device, including a shell body and a cover body that cooperates with the shell body, the shell body and the cover body cooperate to form a water flow cavity; the shell body is provided with a flow limiting structure along the water flow direction, and a first speed limiting plate is provided downstream of the flow limiting structure, the first speed limiting plate is arranged in the water flow cavity and divides the water flow cavity, the first speed limiting plate is provided with a plurality of first flow holes arranged at intervals, and the first flow holes are connected to the water flow cavity separated by the first speed limiting plate.

Description

Technical Field

[0001] The embodiments of the present invention relate to, but are not limited to, the technical field of bathroom products, and more specifically, to a current limiting device. Background Art

[0002] At present, flow limiters are widely used in water outlet devices to limit the water flow rate of the water outlet devices. In the prior art, an O-ring is usually added to the flow channel of the flow limiter to limit the water flow rate through the deformation of the O-ring. When the water pressure increases, the O-ring will be deformed and flattened, making the water flow cross-sectional area smaller, thereby achieving the flow limit effect.

[0003] However, when the water pressure is lower than a certain value, the O-ring will not be able to deform, and thus cannot achieve the flow limiting effect. At this time, if the water flow area is changed by thickening the O-ring to achieve the flow limiting effect, due to the large tolerance range during the production of the O-ring, it cannot meet the flow limit range with higher precision; and when the water flow area becomes smaller and the pressure remains unchanged, the water flow velocity will increase, and the flow fluctuation range will further expand, which will not be able to meet the flow range with higher precision.

[0004] For example, when both the national standards GB18145-2014 and GB28378-2019 need to be met, the flow rate of the shower head under a water pressure of 0.1Mpa must be controlled between: 4.0L / MIN≤L≤4.5L / MIN, and the difference between the maximum and minimum flow rates is only 0.5L / MIN. However, under 0.1Mpa, the O-ring cannot be deformed, and the water flow area can only be changed by thickening the O-ring to achieve the flow limiting effect. Due to the large tolerance range of the O-ring during production, it cannot meet the flow range of 0.5L / MIN after testing; and when the water flow area becomes smaller and the pressure remains unchanged, the water flow rate will increase, and the flow fluctuation range will further expand. Summary of the invention

[0005] An embodiment of the present invention provides a flow limiting device, including a shell body, and a cover body that cooperates with the shell body, the shell body and the cover body cooperate to form a water flow cavity; the shell body is provided with a flow limiting structure along the water flow direction, and a first speed limiting plate is provided downstream of the flow limiting structure, the first speed limiting plate is provided in the water flow cavity and divides the water flow cavity, the first speed limiting plate is provided with a plurality of first flow holes arranged at intervals, and the first flow holes connect the water flow cavity separated by the first speed limiting plate.

[0006] Compared with the prior art, the flow limiting device of the embodiment of the present invention can not only limit the water flow rate but also stabilize the water flow speed by setting the flow limiting structure and the first speed limiting plate, thereby achieving high-precision water flow control and water flow stability.

[0007] In an exemplary embodiment, the embodiment of the present invention further improves the flow control accuracy and flow rate stability by setting the total water flow area relationship and position relationship between the flow limiting structure and the flow holes on the first rate limiting plate.

[0008] In an exemplary embodiment, the embodiment of the present invention further controls the water outlet stability and flow range by providing a flow hole on the cover body and controlling the water outlet area of ​​the flow hole at the water outlet end.

[0009] In an exemplary embodiment, the embodiment of the present invention controls the flow rate of the water flow again by setting a second speed limiting plate, thereby further improving the stability of the water flow.

[0010] In an exemplary embodiment, the embodiment of the present invention can perform multi-level control of water flow and flow rate, thereby achieving stable water output while limiting the flow, and can also achieve control of multiple water flow rates and flow rates with high control accuracy and can adapt to different shower equipment.

[0011] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0013] Figure 1 A three-dimensional exploded view of a current limiting device provided in Embodiment 1 of the present invention;

[0014] Figure 2 A three-dimensional cross-sectional view of a current limiting device provided in Embodiment 1 of the present invention;

[0015] Figure 3 A front cross-sectional view of a current limiting device provided in Embodiment 1 of the present invention;

[0016] Figure 4 A three-dimensional exploded view of a current limiting device provided in Embodiment 2 of the present invention;

[0017] Figure 5 A three-dimensional cross-sectional view of a current limiting device provided in Embodiment 2 of the present invention;

[0018] Figure 6 A front cross-sectional view of a current limiting device provided in Embodiment 2 of the present invention;

[0019] Figure 7A three-dimensional exploded view of a current limiting device provided in Embodiment 3 of the present invention;

[0020] Figure 8 for Figure 7 Another angle view of

[0021] Fig. 9 This is a three-dimensional cross-sectional view of a current limiting device provided in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other at will.

[0023] like Figure 1-3 As shown, the first embodiment of the present invention provides a flow limiting device, comprising: a housing body 1a, and a cover body 2a that cooperates with the housing body 1a to cover the housing body 1a. The housing body 1a and the cover body 2a cooperate to form a water flow cavity 3a (see Figure 2 ).

[0024] like Figure 1 , Figure 2 As shown, the housing body 1a includes an inlet end 11a and an outlet end 12a, and a cavity 13a disposed between the inlet end 11a and the outlet end 12a. The inlet end 11a is provided with a stopper 110a, and the stopper 110a is provided with a plurality of second flow holes 1101a arranged at intervals. The bottom end of the stopper 110a is provided with a mounting groove 1102a. The inner wall of the outlet end 12a is provided with an annular groove (not numbered).

[0025] In this embodiment, a stopper 110a is provided at the water inlet end 11a of the housing body 1a as a flow limiting structure, so that the water entering the flow limiting device can be limited once.

[0026] like Figure 1-3 As shown, the flow limiting device also includes a first speed limiting plate 4a arranged in the water flow cavity 3a, the first speed limiting plate 4a divides the water flow cavity 3a, and the first speed limiting plate 4a is provided with a plurality of first flow holes 40a arranged at intervals, and the first flow holes 40a communicate with the water flow cavity 3a separated by the first speed limiting plate 4a. The first speed limiting plate 4a includes an extension portion 41a extending from its upper end surface toward the stop portion 110a, and the extension portion 41a can cooperate with the stop portion 110a for positioning. The extension portion 41a includes a convex shoulder 410a, and the convex shoulder 410a is circumferentially spaced with a plurality of ribs 4101a, and a plurality of first flow holes 40a are arranged on the outer periphery of the extension portion 41a. The end of the extension portion 41a cooperates with the mounting groove 1102a at the bottom end of the stop portion 110a for installation and positioning. The total water flow area of ​​the plurality of first flow holes 40a of the first speed limiting plate 4a is greater than or equal to the total water flow area of ​​the plurality of second flow holes 1101a.

[0027] Since the water first passes through the second flow hole 1101a and then through the first flow hole 40a, the second flow hole 1101a reduces the water flow rate, but increases the water flow speed. The first flow hole 40a set on the first speed limit plate 4a can slow down the water flow speed. At the same time, the total water flow area of ​​the first flow hole 40a is greater than or equal to the total water flow area of ​​the plurality of second flow holes 1101a. When the water flows through the first flow hole 40a, the water flow area does not decrease and the flow speed decreases, thereby achieving the effect of speed limiting without flow limiting, and realizing the effect of stabilizing the water flow speed under the limited water flow rate.

[0028] The flow limiting device of this embodiment can not only limit the water flow rate but also stabilize the water flow speed by providing the flow limiting structure 110a and the first speed limiting plate 4a, thereby achieving high-precision water flow control and water flow stability control.

[0029] In this embodiment, a plurality of convex ribs 410a are arranged at intervals in the circumferential direction of the extension portion 40a, thereby increasing the area of ​​the first speed limiting plate 4a blocking the water flow, and can further limit the water flow speed.

[0030] like Figure 1-3 As shown, the flow limiting device also includes a first deformable member 5a disposed in the water flow chamber 3a. The first deformable member 5a is located between the stop portion 110a and the first speed limiting plate 4a. The first deformable member 5a is umbrella-shaped as a whole, and is sleeved on the protruding portion 41a and extends toward the inner wall of the outer shell body 1a. The first deformable member 5a is deformed after being impacted by the water flow, and a gap is generated between the first deformable member 5a and the inner wall of the outer shell body 1a, and the water continues to flow downward through the gap. When the water flows through, the water flow area opened by the first deformable member 5a is greater than or equal to the total water flow area of ​​the multiple second flow holes 1101a, so that the water flow area in the water flow chamber 3a is not restricted, achieving the effect of speed limitation without flow limitation. In this embodiment, the first deformable member 5a can be made of rubber.

[0031] Since the water flow entering the flow limiting device is limited once by the stopper 110a, the water flow velocity will increase, affecting the stability of the water outlet. By setting the first deformable member 5a to stop the water flow, the water flow can be slowed down and the water outlet flow velocity can be stabilized without loss or loss of less flow.

[0032] At the same time, when water flows in from the convex surface of the first deformable member 5a, the first deformable member 5a can be opened and water flows through; when water flows in from the concave surface of the first deformable member 5a, the first deformable member 5a cannot be opened and water cannot flow through, thereby achieving a backflow prevention effect.

[0033] like Figure 1 , Figure 2As shown, the cover body 2a includes a connecting portion 20a and a water outlet portion 21a connected to the outer shell body 1a. The connecting portion 20a extends into the outer shell body 1a, and the outer side wall is provided with a convex ring 201a, which is matched with a ring groove (unnumbered) provided on the inner wall of the outer shell body 1a. The water outlet portion 21a is provided with a plurality of third flow holes 210a arranged at intervals, and the total water flow area of ​​the plurality of third flow holes 210a is less than or equal to the total water flow area of ​​the second flow hole 1101a. Along the axial direction of the flow limiting device, the first flow hole 40a and the third flow hole 210a are staggered. The staggered arrangement of the first flow hole 40a and the third flow hole 210a described in this embodiment refers to at least a partial staggered arrangement.

[0034] When the water flows through the water outlet 21a, the flow rate and flow velocity reach a stable value, thereby achieving a stable effect of low-pressure water flow. When the total water flow area of ​​the plurality of third flow holes 210a is equal to the total water flow area of ​​the second flow holes 1101a, the purpose of limiting the water flow velocity again without limiting the water flow rate can be achieved, making the water flow rate more stable. When the total water flow area of ​​the plurality of third flow holes 210a is smaller than the total water flow area of ​​the second flow holes 1101a, the purpose of limiting the water flow velocity and flow rate can be achieved again, thereby achieving higher precision flow control.

[0035] When installing the current limiting device of this embodiment, firstly, the first deformable member 5a is sleeved on the protruding portion 40a of the first speed limiting plate 4a, the first deformable member 5a is positioned on the boss 410, and the plurality of protruding ribs 410a abut against the bottom wall of the first deformable member 5a. Then, the first deformable member 5a and the first speed limiting plate 4a are installed together on the shell body 1a, and the protruding portion 41a of the first speed limiting plate 4a cooperates with the mounting groove 1102a at the bottom end of the shell body 1a for installation and positioning. Then, the cover body 2a is matched with the shell body 1a, and the connecting portion 20a of the cover body 2a extends into the shell body 1a and abuts against the bottom end of the first speed limiting plate 4a to position the first speed limiting plate 4a, and the convex ring 201a on the connecting portion 20a cooperates with the annular groove (not numbered) provided on the inner wall of the shell body 1a for buckling.

[0036] The current limiting device of this embodiment further comprises a sealing ring 7a arranged on the outer wall of the shell body 1a, which is used for sealing after the current limiting device and the external parts are installed and matched.

[0037] When the flow limiting device of this embodiment is working, the water first flows through the stopper 110a, and flows out from the second flow hole 1101a of the stopper 110a and passes through the flow limiting once. At this time, the flow velocity of the water increases, and the flow velocity of the water slows down after passing through the first deformable member 5a. The first deformable member 5a is deformed due to the impact of the water flow, and the water flows out from the gap between the first deformable member 5a and the inner wall of the shell body 1a. At this time, the flow velocity of the water decreases and flows into the first speed limiting plate 4a. The first flow hole 40a of the first speed limiting plate 4a can slow down the water flow velocity for the second time. The total water flow area of ​​the first flow hole 40a is greater than or equal to the total water flow area of ​​the multiple second flow holes 1101a, thereby achieving the effect of speed limiting without flow limiting, and realizing the effect of stabilizing the water flow velocity under the limited water flow rate. The multiple ribs 410a circumferentially of the extension 41a of the first speed limiting plate 4a can further limit the water flow velocity. The water flowing out of the first speed limiting plate 4a flows out of the flow limiting device through the cover body 2a, and the third flow hole 210a on the water outlet portion 21a of the cover body 2a limits the flow velocity or the flow velocity and flow rate of the water again.

[0038] This embodiment performs multi-level control on the water flow rate and flow rate, thereby achieving stable water output while limiting the flow, and can also achieve control of a variety of water flow rates and flow rates with high control accuracy, and can adapt to different shower equipment.

[0039] The limiting device of this embodiment has high flow limiting accuracy and can simultaneously meet the flow rate of GB18145-2014 and GB28378-2019 under 0.1Mpa water pressure: 4.0L / MIN≤L≤4.5L / MIN. Of course, the specific accuracy range can be set according to the structure of this embodiment and is not limited here.

[0040] like Figure 4-6 As shown, the second embodiment of the present invention provides a flow limiting device, including: a housing body 1b, and a cover body 2b that cooperates with the housing body 1b to cover the housing body 1b. The housing body 1b and the cover body 2b cooperate to form a water flow cavity 3b (see Figure 5 ). The flow limiting device also includes a first speed limiting plate 4b arranged in the water flow chamber 3b, the first speed limiting plate 4b divides the water flow chamber 3b, the first speed limiting plate 4b is provided with a plurality of first flow holes 40b arranged at intervals, and the first flow holes 40b are connected to the water flow chamber 3b divided by the first speed limiting plate 4b. The outer shell body 1b is provided with a stopper 110b, and the stopper 110b is provided with a plurality of second flow holes 1101b arranged at intervals. The cover body 2b includes a connecting portion 20b connected to the outer shell body 1b and a water outlet portion 21b. The water outlet portion 21b is provided with a plurality of third flow holes 210b arranged at intervals. The flow limiting device also includes a first deformable member 5b arranged in the water flow chamber 3b and located between the stopper 110b and the first speed limiting plate 4b.

[0041] The specific structure, configuration and function of the shell body 1b, cover body 2b, first speed limit plate 4b and first deformable member 5b of this embodiment can be referred to the corresponding shell body 1a, cover body 2a, first speed limit plate 4a and first deformable member 5a, and will not be repeated here.

[0042] The main difference between this embodiment and the first embodiment is that the flow limiting device of this embodiment further includes a second deformable member 6b disposed in the water flow cavity 3b and disposed at the upper end of the water outlet 21b of the cover body 2b. The second deformable member 6b is annular and can shield at least part of the third flow hole 210b when deformed. The second deformable member 6b can not be deformed at a pressure lower than 0.3Mpa, and can be deformed at a pressure higher than or equal to 0.3Mpa, so as to achieve no flow limitation at low pressure and flow limitation after deformation at high pressure, thereby further stabilizing the flow velocity and flow rate.

[0043] The limiting device of this embodiment has high flow limiting accuracy and can simultaneously meet the flow rate of GB18145-2014 and GB28378-2019 under 0.1Mpa water pressure: 4.0L / MIN≤L≤4.5L / MIN. Of course, the specific accuracy range can be set according to the structure of this embodiment and is not limited here.

[0044] like Figure 7-9 As shown, the third embodiment of the present invention provides a flow limiting device, including: a shell body 1c, and a cover body 2c that cooperates with the shell body 1c to cover the shell body 1c. The shell body 1c and the cover body 2c cooperate to form a water flow cavity 3c (see Fig. 9 The flow limiting device further includes a first speed limiting plate 4c disposed in the water flow cavity 3c, the first speed limiting plate 4c divides the water flow cavity 3c, the first speed limiting plate 4c is provided with a plurality of first flow holes 40c arranged at intervals, and the first flow holes 40c communicate with the water flow cavity 3c divided by the first speed limiting plate 4c.

[0045] The housing body 1c is provided with a stopper 110c, and the stopper 110c is provided with a plurality of second flow holes 1101c arranged at intervals. The cover body 2c includes a connecting portion 20c connected to the housing body 1c and a water outlet 21c. The water outlet 21c is provided with a plurality of third flow holes 210c arranged at intervals.

[0046] The structure, arrangement and function of the shell body 1c, cover body 2c and first speed limiting plate 4c of this embodiment can refer to the shell body 1a, cover body 2a and first speed limiting plate 4a of the first embodiment, and will not be repeated here.

[0047] The main difference between this embodiment and the first embodiment is that the flow limiting device of this embodiment also includes a second speed limiting plate 5c disposed in the water flow cavity 3c and separating the water flow cavity 3c, and the second speed limiting plate 5c is located between the stop portion 110c and the first speed limiting plate 4c. The second speed limiting plate 5c is disposed in a plurality of fourth flow holes 50c arranged at intervals to connect the water flow cavity 3c separated by the second speed limiting plate 5c. The total water flow area of ​​the fourth flow hole 50c is greater than or equal to the total water flow area of ​​the second flow hole 1101c. Along the axial direction of the flow limiting device, the fourth flow hole 50c is staggered with the first flow hole 40c and the second flow hole 1101c, respectively.

[0048] The first speed limiting plate 4c includes an extension portion 41c extending from the upper end surface and cooperating with the stop portion 110c to be positioned. The side wall of the extension portion 41c is provided with a first rib 410c (see Figure 7 The second speed limiting plate 5c is sleeved on the extension portion 41c, and includes a first groove 51c (see Figure 8 ).

[0049] The first speed limiting plate 4c includes a convex ring 42c extending from the lower end surface to the water outlet end, and the convex ring 42c is provided with a second groove 420c (see Figure 8 The water outlet 21c of the cover 2c is provided with a protruding portion 22c extending toward the first speed limiting plate 4c, and the protruding portion 22c is provided with a second rib 220c cooperating with the second groove 420c for positioning (see Figure 7 ). Along the axial direction of the current limiting device, the first rib 410c and the first groove 51c are matched at positions that are staggered with the second rib 220c and the second groove 420c. Thus, during installation, along the axial direction of the current limiting device, the fourth flow hole 50c is staggered with the first flow hole 40c and the second flow hole 1101c.

[0050] The first flow hole 40c of the first speed limiting piece 4c is located on the outer circle, and the second flow hole 1101c of the stopper 110c is located on the inner circle. The hole positions of the first speed limiting piece 4c and the stopper 110c are staggered, so that the water flow passing through the stopper 110c slows down after encountering an obstacle, and the water flow has the first deceleration after flow limitation. In order to ensure that the water flow is not limited after passing through the first speed limiting piece 4c and the second speed limiting piece 5c, the cross-sectional area of ​​the water flow holes of the first speed limiting piece 4c and the second speed limiting piece 5c is designed to be equal to or slightly larger than the cross-sectional area of ​​the water flow holes of the second flow hole 1101c on the stopper 110c.

[0051] At the same time, in order to ensure that the position of the first flow hole 40c on the first speed limiting plate 4c and the position of the fourth flow hole 50c on the second speed limiting plate 5c are staggered, a first rib 410c, a second rib 220c, a second groove 51c and a second groove 420c are provided. The first rib 410c, the matching position with the first groove 51c and the matching position with the second rib 220c and the second groove 420c are not in a straight line along the axial direction, so that the flow holes of the first speed limiting plate 4c and the second speed limiting plate 5c are misaligned, and the flow holes of the first speed limiting plate 4c and the cover body 2c are staggered. The above-mentioned matching positions can also be on a straight line, and the flow holes of the first speed limiting plate 4c and the second speed limiting plate 5c can be staggered, so that the water flow passing through the second speed limiting plate 5c encounters obstacles again, and the water flow speed is slowed down for the second time.

[0052] When the total water flow area of ​​the third flow holes 210c of the cover body 2c is equal to the total water flow area of ​​the stopper 1101c, the cover body 2c plays the role of a third speed limiter, allowing the water flow to pass stably. At this time, the entire water flow speed limiter is suitable for showers with a relatively small flow rate. When the total water flow area of ​​the third flow holes 210c of the cover body 2c is smaller than the total water flow area of ​​the stopper 1101c, the cover body 2c plays the role of speed limiter and flow limiter. At this time, the entire accessory is suitable for showers with a relatively large flow rate.

[0053] This embodiment uses two speed limiter plates 4c, 5c. The more speed limiter plates are designed, the more stable the flow rate and flow velocity of the water flow. At the same time, through the design of the water flow area of ​​the water hole, water flow speed limiters of different specifications can be obtained, thereby reducing the development cost.

[0054] The limiting device of this embodiment has high flow limiting accuracy and can simultaneously meet the flow rate of GB18145-2014 and GB28378-2019 under 0.1Mpa water pressure: 4.0L / MIN≤L≤4.5L / MIN. Of course, the specific accuracy range can be set according to the structure of this embodiment and is not limited here.

[0055] In the description of the embodiments of the present invention, the term "plurality" refers to two or more. In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", ""mouth"-shaped structure" and the like indicate positions or positional relationships based on the positions 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 structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0056] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be defined by the attached claims.

Claims

1. A current limiting device, characterized in that: The flow limiting device comprises: a shell body, and a cover body matched with the shell body, the shell body and the cover body cooperate to form a water flow cavity; the shell body is provided with a flow limiting structure along the water flow direction, a first speed limiting plate is provided downstream of the flow limiting structure, the first speed limiting plate is provided in the water flow cavity and divides the water flow cavity, the first speed limiting plate is provided with a plurality of first flow holes arranged at intervals, the first flow holes are connected to the water flow cavity divided by the first speed limiting plate; The shell body includes a water inlet end and a water outlet end, the water inlet end is provided with a stopper as the flow limiting structure, the stopper is provided with a plurality of second flow holes arranged at intervals, and the total water flow area of ​​the plurality of first flow holes is greater than or equal to the total water flow area of ​​the plurality of second flow holes.

2. The current limiting device according to claim 1, characterized in that: The cover body includes a connecting portion connected to the shell body and a water outlet portion, the water outlet portion is provided with a plurality of third flow holes arranged at intervals, and the total water flow area of ​​the plurality of third flow holes is less than or equal to the total water flow area of ​​the plurality of second flow holes.

3. The current limiting device according to claim 2, characterized in that: Along the axial direction of the current limiting device, the plurality of first flow holes and the plurality of third flow holes are staggered.

4. The current limiting device according to claim 2, characterized in that: The first speed limiting plate includes a protruding portion extending from the upper end surface and cooperating with the stop portion for positioning, a plurality of convex ribs are arranged at intervals in the circumferential direction of the protruding portion, and a plurality of the first flow holes are arranged on the outer periphery of the protruding portion.

5. The current limiting device according to claim 4, characterized in that: It also includes a first deformable member arranged in the water flow cavity and located between the flow limiting structure and the first speed limiting plate. The first deformable member is sleeved on the protruding portion and extends toward the inner wall of the shell body. The water flow area opened by the first deformable member when water flows through is greater than or equal to the total water flow area of ​​the plurality of second flow holes.

6. The current limiting device according to claim 2, characterized in that: The flow limiting device also includes a second deformable member arranged in the water flow cavity and located at the upper end of the water outlet portion. The plurality of third flow holes are arranged at intervals along the circumferential direction. The second deformable member is annular and can cover at least part of the third flow holes when deformed.

7. The current limiting device according to claim 1 or 2, characterized in that: The flow limiting device also includes a second speed limiting plate arranged in the water flow cavity and dividing the water flow cavity, the second speed limiting plate is located between the flow limiting structure and the first speed limiting plate, the second speed limiting plate is provided with a plurality of fourth flow holes arranged at intervals, the total water flow area of ​​the plurality of fourth flow holes is equal to or greater than the total water flow area of ​​the plurality of second flow holes; along the axial direction of the flow limiting device, the plurality of fourth flow holes are staggered with the plurality of first flow holes and the plurality of second flow holes respectively.

8. The current limiting device according to claim 7, characterized in that: The first speed limiting plate also includes an extension portion extending from the upper end surface and cooperating with the stop portion to be positioned, and the side wall of the extension portion is provided with a first rib. The second speed limiting plate is sleeved on the extension portion and includes a first groove cooperating with the first rib to be positioned.

9. The current limiting device according to claim 7, characterized in that: The first speed limiting plate also includes a convex ring extending from the lower end surface toward the water outlet end, the convex ring is provided with a second groove, the water outlet portion of the cover body is provided with a protruding portion extending toward the first speed limiting plate, the protruding portion is provided with a second rib that cooperates with the second groove for positioning, and along the axial direction of the flow limiting device, the cooperation position of the second rib and the second groove is staggered with the cooperation position of the first rib and the first groove.

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