CN112483697A

CN112483697A - Flow limiting valve

Info

Publication number: CN112483697A
Application number: CN202011486750.6A
Authority: CN
Inventors: 林孝发; 林孝山; 张勇辉; 陈志伟; 邓飞明; 邓小清; 刘启乔
Original assignee: Fujian Xihe Sanitary Ware Technology Co Ltd
Current assignee: Fujian Xihe Sanitary Ware Technology Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-03-12

Abstract

The invention discloses a flow limiting valve, which is arranged in a flow passage and comprises: the water inlet end of the flow channel is connected with the water inlet end of the valve core; a water passing port communicated with the water outlet is formed in the groove wall of the ring groove close to the water outlet, and a plurality of first bulges are convexly arranged at intervals at the groove bottom of the ring groove along the circumferential direction of the ring groove; the elastic ring is positioned in the annular groove, sleeved outside each first bulge and positioned on the groove wall of the annular groove provided with the water passing port, and a second water passing interval is arranged between the groove wall of the annular groove far away from the water outlet and the elastic ring; the elastic ring protruding ring groove is in interference fit with the inner wall of the flow channel, and the elastic ring and the first bulges are enclosed to form an overflowing gap communicated with the second water passing interval and the water passing opening. The elastic ring of the flow limiting valve can limit flow, can be in interference fit with the flow channel to realize the installation of the flow limiting valve, and has small disassembly resistance during disassembly.

Description

Flow limiting valve

Technical Field

The invention relates to the field of valves, in particular to a flow limiting valve.

Background

The flow limiting valve is widely applied to life as a water-saving valve, and generally an elastic throttling element is matched with a valve core to form a water passing gap; when the elastic throttling element is under the action of water pressure, the elastic throttling element is pressed to deform so as to reduce the water passing gap; when the water flow is larger, the water pressure is larger, the deformation of the elastic throttling element is larger, and therefore the water passing gap is reduced along with the increase of the water flow, and the water saving function is realized; however, when the water flow is small and the water pressure is low, the water flow is less limited by the throttling element, so that the use is influenced.

Because the flow limiting valve is generally arranged in a flow passage of the water pipe, the flow limiting valve needs to be pulled out by means of a tool when the flow limiting valve needs to be cleaned or replaced; because the flow limiting valve is usually fastened and installed through interference fit of the side wall of the valve body and the flow channel, the resistance of drawing is large, and the disassembly is inconvenient.

Disclosure of Invention

The invention aims to overcome the defects or problems in the background art and provide the flow limiting valve which can realize large flow at low pressure, is convenient to disassemble and has small disassembling resistance.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a restriction valve, its installs in the runner, its characterized in that includes: one end of the valve core faces the water inlet end of the flow channel, the other end of the valve core is provided with a water outlet, an inward-concave annular groove is formed in the outer wall of the valve core, and a first water passing interval is formed between the outer wall of the valve core, which is positioned between the annular groove and the end facing the water inlet end, and the flow channel; a water outlet communicated with the water outlet is formed in the wall, close to the water outlet, of the annular groove, and a plurality of first bulges are convexly arranged at intervals at the bottom of the annular groove along the circumferential direction of the annular groove; the elastic ring is positioned in the annular groove, sleeved outside each first bulge and positioned on the groove wall of the annular groove provided with the water passing port, and a second water passing interval is arranged between the groove wall of the annular groove far away from the water outlet and the elastic ring; the elastic ring protruding ring groove is in interference sealing fit with the inner wall of the flow channel, and the elastic ring and the first bulges are enclosed to form an overflowing gap communicated with the second water passing interval and the water passing opening.

Furthermore, the valve core comprises a body and a first annular wall sleeved outside the body, and a space is reserved between the first annular wall and the body; the body extends towards the water inlet end along the axial direction and protrudes out of the first annular wall to form a protruding part, an annular bump is arranged on the outer wall of the protruding part along the circumferential direction, the annular bump extends along the axial direction, and the outer wall of the annular bump and the flow channel form a first water passing interval; the end face of the first annular wall, which is close to the water inlet end, and the end face of the annular lug, which is far away from the water inlet end, are spaced from each other to form the annular groove; the first annular wall and the body form the water passing opening therebetween.

Further, the protruding portion is provided with a plurality of first lugs at intervals along the circumferential direction, and the first lugs form the annular lugs.

Further, the device also comprises an adjusting piece and an elastic piece; the body is provided with a through hole along the axial direction; the through hole is provided with a hole shoulder facing the water inlet end; the adjusting piece is in sliding fit with the through hole, one end of the adjusting piece is provided with a second bulge, the other end of the adjusting piece is provided with an elastic clamping jaw, and the peripheral side wall of the adjusting piece is also provided with a flange opposite to the hole shoulder; the body is provided with a limiting surface deviating from the water inlet end so as to be in limiting fit with the elastic clamping jaw penetrating through the through hole; the two ends of the elastic piece act on the body and the adjusting piece respectively, the adjusting piece slides in the through hole under the combined action of water pressure and the elastic force of the elastic piece, and the flange is close to or abuts against or is far away from the hole shoulder.

Furthermore, the body is also provided with an abutting part in the through hole, and a third water passing interval is formed between the abutting part and the hole wall of the through hole; one end of the elastic piece abuts against the flange, the other end of the elastic piece abuts against the abutting part, and the elastic clamping jaw penetrates through the third water passing interval to be in spacing fit with the limiting surface.

Furthermore, the abutting part is provided with a through hole along the axial direction, and the adjusting part is also provided with a protruding shaft penetrating through the through hole.

Further, the hole shoulder is inwards formed into a first conical surface, and the flange is provided with a second conical surface matched with the hole shoulder.

Further, the flange is provided with a resilient sealing surface opposite the bore shoulder.

Further, the flange cover is equipped with the silica gel cover to form the elastic sealing face.

As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:

1. the elastic ring and each first bulge are encircled to form an overflowing gap, and water flows from the second water flowing gap through the first water flowing gap to the overflowing gap and then flows from the water flowing port to the water outlet; because the elastic ring has elasticity, the elastic ring can deform under the action of water pressure, so that the overflowing gap is reduced, and the current is limited. The elastic ring is arranged on the outer wall of the flow limiting valve, and the protruding ring groove is in interference sealing fit with the flow channel to realize the installation of the flow limiting valve, so that the elastic ring is used for the installation of the flow limiting valve and the flow limitation.

2. The first convex blocks are arranged at intervals along the circumferential direction of the protruding parts to form annular convex blocks, and in the using process, water flow can flow into the overflowing gaps formed by the elastic rings and the first bulges in a surrounding mode from the gaps among the first convex blocks and flow out of the water outlet from the water passing port.

3. When the water pressure is small, the elastic force of the elastic piece borne by the adjusting piece is larger than the pressure of the water pressure, the flange is far away from the hole shoulder to form a water passing gap, water flow can flow out of the through hole, and large flow is realized at low pressure; meanwhile, the elastic clamping jaw is matched with the limiting surface to limit the adjusting piece, so that the adjusting piece is prevented from being separated from the valve core under the action of elastic force of the elastic piece.

When the water pressure is higher, the pressure of the regulating part under the water pressure is greater than the elastic force of the elastic part, the elastic part is compressed, the flange is close to or props against the hole shoulder, the water passing gap formed between the through hole and the flange is reduced, or the through hole is plugged, and throttling is performed.

When the flow limiting valve needs to be disassembled, the second bulge is pulled by hands or by means of a tool, so that the elastic clamping claw is in butt fit with the limiting surface, and the flow limiting valve is integrally pulled out of the flow channel; because the flow limiting valve is fixed by the interference sealing fit of the elastic ring and the flow channel, the resistance is small when the flow limiting valve is disassembled.

4. A butt joint part is arranged in the through hole of the body, and a third water passing interval is formed between the butt joint part and the hole wall of the through hole; the elastic piece is abutted against the abutting part, and the elastic clamping jaw penetrates through the third water passing interval and is abutted against the limiting surface; the abutting part is reasonable in structure and simple in structure.

5. The abutting part is provided with a through hole along the axial direction; the adjusting piece is provided with a convex shaft penetrating through the through hole. The adjusting piece is matched with the through hole of the abutting part through the convex shaft, sliding fit with the through hole is achieved, the structure is simple, and materials are saved.

6. The hole shoulder inwards forms a first conical surface, a second conical surface matched with the first conical surface is arranged on the flange, and when the flange abuts against the hole shoulder due to the fact that water pressure is high, the first conical surface is matched with the second conical surface, and sealing performance is better.

7. The flange is provided with an elastic sealing surface opposite to the hole shoulder, and when the flange abuts against the hole shoulder due to high water pressure, the sealing performance between the flange and the hole shoulder can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective exploded view of a flow limiting valve in the first embodiment;

FIG. 2 is a schematic perspective view of a valve core of the first embodiment at a first viewing angle;

FIG. 3 is a schematic top view of a valve cartridge according to one embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3 in accordance with one embodiment of the present invention;

FIG. 5 is a schematic perspective view of an adjusting member according to one embodiment of the present invention;

fig. 6 is a schematic perspective view of a flow limiting valve in the first embodiment;

FIG. 7 is a schematic cross-sectional view of a flow restriction valve in accordance with one embodiment of the present invention;

fig. 8 is a schematic view illustrating a first state in which a flow limiting valve is installed in a flow passage according to the present embodiment;

fig. 9 is a schematic view illustrating a second state in which a flow limiting valve is installed in a flow passage according to the first embodiment of the present disclosure;

FIG. 10 is a schematic cross-sectional view of a preferred installation of a constrictor valve according to one embodiment of the present disclosure;

fig. 11 is a schematic cross-sectional view of the second flow-limiting valve of this embodiment in a first state installed in the flow passage;

fig. 12 is a schematic cross-sectional view of the second state where the second flow limiting valve is installed in the flow passage according to the second embodiment.

Description of the main reference numerals:

a valve core 1; a body 11; a main body 111; a through hole 112; a bore shoulder 1121; the first bump 113; a first protrusion 114; a guide post 115; a second annular wall 116; a through hole 1161; a connecting plate 117; a third water passing compartment 118; a limiting surface 119; a first annular wall 12; a connecting rib 13; a water passage 14; a water inlet end 141; a water outlet 15; a first ring groove 16;

an adjusting member 2; a water stop surface cover 21; a flange 211; a projection 22; a second card slot 221; a second annular groove 221; an elastic claw 23; a protruding shaft 24;

an elastic member 3;

an elastic ring 4;

a silica gel sleeve 5;

a flow passage 100; a water inlet end 101; a radial projection 102;

a flow limiting valve 200;

a first water passing space 300.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are presently preferred embodiments of the invention and are not to be taken as an exclusion of other embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence.

In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, all directional or positional relationships indicated by the terms "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," "counterclockwise," and the like are based on the directional or positional relationships indicated in the drawings and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so indicated must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the terms "fixedly connected" or "fixedly connected" should be interpreted broadly, that is, any connection between the two that does not have a relative rotational or translational relationship, that is, non-detachably fixed, integrally connected, and fixedly connected by other devices or elements.

In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting.

The first embodiment is as follows:

referring to fig. 1, fig. 1 shows that a flow limiting valve 200 includes a valve core 1, an adjusting member 2, an elastic member 3 and an elastic ring 4, and the flow limiting valve 200 is installed in a flow passage 100, as shown in fig. 8, and defines a water inlet end 101 of the flow passage 100 for convenience of description.

Specifically, as shown in fig. 2 to 4, the valve core 1 includes a body 11, a first annular wall 12 and a plurality of connecting ribs 13, which are integrally connected to each other. The body 11 includes a main body 111, the main body 111 is a cylindrical tubular structure, and an inner cavity of the main body forms a through hole 112. The outer wall of the main body 111 close to the water inlet end 101 of the flow channel 100 is circumferentially provided with a plurality of first protrusions 113 at intervals, the first protrusions 113 extend along the axial direction of the main body 111, and the surface of the first protrusions 113 close to the water inlet end 101 and the end surface of the main body 111 close to the water inlet end 101 are located on the same horizontal plane. The first protrusion 113 is provided with a first protrusion 114 extending in a direction away from the water inlet end 101 on a surface facing away from the water inlet end 101. A part of the first protrusion 113 is provided with a guide post 115 extending towards the water inlet end 101 on the surface close to the water inlet end 101, and in this embodiment, four guide posts 115 are provided and are uniformly distributed along the circumferential direction of the main body 111. The end surface of the through hole 112 near the water inlet end 101 forms a hole shoulder 1121, and the hole shoulder 1121 inwardly forms a first conical surface facing the water inlet end 101. The inner wall of the main body 111 facing away from the water inlet end 101 is provided with an abutting part, and the abutting part comprises a second annular wall 116 and a plurality of connecting plates 117. The interior cavity of the second surround 116 forms a through hole 1161. The connecting plates 117 are uniformly distributed on the outer wall of the second annular wall 116, and extend from the outer wall of the second annular wall 116 to the inner wall of the main body 111 in the radial direction, in this embodiment, three connecting plates 117 are provided. The connecting plates 117, the inner wall of the main body 111 and the outer wall of the second annular wall 116 enclose three third water passing intervals 118 together, and the abutting part is reasonable in structure and simple in structure. As shown in fig. 7, the end surface of the main body 111 facing away from the water inlet end 101 forms a limiting surface 119.

As shown in fig. 2 to 4, the first annular wall 12 and the main body 111 are coaxially sleeved outside an end of the main body 111 away from the water inlet end 101, a plurality of connecting ribs 13 are uniformly distributed on an inner wall of the first annular wall 12 close to the water inlet end 101, and the connecting ribs 13 radially inwardly extend to an outer wall of the main body 111 to fix the first annular wall 12 on the main body 111. The part of the body 111 that protrudes axially beyond the first annular wall 12 forms a projection on which the first projection 113 is arranged, forming said annular projection. The surface of the first protrusion 113 facing away from the water inlet end 101 and the end surface of the first annular wall 12 close to the water inlet end 101 are spaced from each other along the axial direction of the main body 111 to form a first annular groove 16, and the first annular groove 16 forms the annular groove. The first protrusions 114 are circumferentially disposed on the bottom of the first ring groove 16 and are offset from the respective connecting ribs 13. A water passing channel 14 is formed between the first annular wall 12 and the outer wall of the main body 111, the two adjacent connecting ribs 13, the inner wall of the first annular wall 12 and the outer wall of the main body 111 enclose a water passing port 141 of the water passing channel 14, an opening end of the first annular wall 12, which is far away from the water inlet end 101, forms a water outlet 15, and the water passing channel 14 is communicated with the water outlet 15.

As shown in fig. 5, the adjusting member 2 includes a waterstop cover 21, a second protrusion 22, an elastic claw 23, and a protruding shaft 24, which are integrally coupled to each other. The water stop surface cover 21 is a disc-shaped surface cover and is covered with the opening end of the through hole 112 close to the water inlet end 101; the outer edge surface of the water stop surface cover 21 opposite to the hole shoulder 1121 forms a flange 211; the flange 211 is provided with a second conical surface matched with the first conical surface. The protruding central point who locates the face of stagnant water face lid 21 orientation water inlet end 101 of second arch 22 puts on, is equipped with second annular groove 221 on the second arch 22 outer wall, and the convenience is got with the help of the instrument clamp. The elastic claw 23 is arranged on the surface of the water stop surface cover 21 forming the flange 211 and arranged away from the second conical surface, and two elastic claws 23 facing the limiting surface are symmetrically arranged in the embodiment. The protruding shaft 24 is a cylindrical structure, and is protruded at the center of the surface of the water stop cover 21 forming the flange 211.

As shown in fig. 1 and 7, the elastic member 3, which is a spring; the end of the protruding shaft 24 is against the surface of the water cover 21 forming a flange, and the other end is against the end surface of the second annular wall 116 near the water inlet end 101.

As shown in fig. 1 and 7, the elastic ring 4 is disposed in the first ring groove 16 and is sleeved outside the first protrusion 114.

In this embodiment, as shown in fig. 6 and 7, firstly, the elastic member 3 is sleeved outside the protruding shaft 24 of the adjusting member 2, and then the protruding shaft 24 is inserted into the through hole 1161 of the valve core 1, a gap is left between the through hole 1161 and the protruding shaft 24, and one end of the elastic member 3 is abutted against the surface of the water surface cover 21 to form the flange 211, and the other end is abutted against the end surface of the second annular wall 116 close to the water inlet end 101; the adjusting member 2 is slidably engaged with the through hole 112 by the engagement of the protruding shaft 24 and the through hole 1161, which is simple in structure and saves material. Meanwhile, the elastic claw 23 of the adjusting piece 2 passes through the third water passing interval 118 to be abutted against the limiting surface 119 of the valve core 1, and the installation of the adjusting piece 2 is completed. At this time, the guide post 115 is located on the outer side of the circumference of the water stop cover 21 of the adjusting part 2, and because a gap is left between the protruding shaft 24 and the through hole 1161, when the adjusting part 2 moves, the water stop cover 21 slides along a channel formed by enclosing the guide post 115, so that the adjusting part 2 can be effectively prevented from inclining. Then, the elastic ring 4 is disposed in the first ring groove 16 and is sleeved outside each of the first protrusions 114. At the moment, the elastic ring 4 is located on the wall of the first annular groove 16 formed by the end face, close to the water inlet end 101, of the first annular wall 12, and a second water passing interval is reserved between the elastic ring and the first bump 113; two adjacent first protrusions 114 and the elastic ring 4 enclose to form an overflowing gap, and the overflowing gap is communicated with the water passing opening 141 of the water passing channel 14. It should be understood that the annular projection, whether formed by a plurality of first projections 113 arranged at intervals or directly formed by a convex ring, can allow water to flow through the second water flowing interval; however, the water flow can also flow into the flow passage gap formed by the first protrusions 114 and the elastic ring 4 from the intervals between the first protrusions 113.

In use, as shown in fig. 8 and 9, the flow limiting valve 200 is first installed in the flow passage 100, the flow limiting valve 200 is inserted into the flow passage 100, and the flow limiting valve 200 is integrally fixed in the flow passage 100 by the elastic ring 4 in elastic interference sealing fit with the inner wall of the flow passage 100. At this time, the second protrusion 22 of the flow restriction valve 200 faces the water inlet end 101 of the flow channel 100, the first protrusion 113 and the inner wall of the flow channel 100 form a first water passing space 300 therebetween, and the outer wall of the first annular wall 12 and the inner wall of the flow channel 100 form a clearance fit.

When water flows in the flow passage 100, the elastic ring 4 is deformed under the action of water pressure, so that a water passing gap formed by the elastic ring 4 and the first protrusion 114 is reduced, the larger the water pressure is, the smaller the water passing gap is, and throttling is realized, so that the elastic ring 4 is used for mounting the flow limiting valve 200 and limiting the flow. As shown in fig. 8, if the water flow is small, the generated water pressure is small, and when the adjusting member 2 receives the elastic force generated by the elastic member 3, the elastic force is larger than the pressure generated by the water flow received by the adjusting member 2; the flange 211 of the water stop cover 21 is far away from the hole shoulder 1121 of the valve core to form a water passing gap. At this time, water flow can flow from the space between the first water flowing space 300 and each first bump 113 to the water flowing space formed by the elastic ring 4 and each first protrusion 114, and then flows into the water flowing channel 14 through the water flowing port 141 and then flows to the water outlet 15; the water flow can also flow into the through hole 112 from the water passing gap between the flange 211 and the hole shoulder 1121, and then flows to the water outlet 15 through the third water passing interval 118; namely, water flow can flow to the water outlet 15 along two water paths at low pressure so as to realize low pressure and large flow. As shown in fig. 9, if the water flow is large and the generated water pressure is large, when the elastic force generated by the elastic element 3 on the adjusting element 2 is smaller than the pressure generated by the water flow on the adjusting element 2, under the action of the water pressure, the adjusting element 2 compresses the elastic element 3 to make the flange 211 approach or abut against the hole shoulder 1121, so as to reduce the water flow gap between the water stop cover 21 and the hole shoulder 1121 or block the through hole 112, so that the amount of the water flow flowing from the through hole 112 to the water outlet 15 is reduced or the water flow is limited to only flow from the water passage 14 to the water outlet 15, thereby limiting the water flow. It should be understood that when the flange 211 abuts against the hole shoulder 1121, the first tapered surface and the second tapered surface abut against each other, and the sealing performance when the flange 211 blocks the through hole 112 can be increased by the tapered surface fit, and the sealing effect is better if a layer of elastic sealing surface opposite to the first tapered surface is added on the second tapered surface.

As shown in fig. 8, when the restriction valve 200 needs to be disassembled, the second protrusion 22 is pulled by a tool or a hand, so that the elastic claw 23 abuts against the limiting surface 119, and the whole restriction valve 200 is pulled out from the flow passage 100 by a pulling force, because the restriction valve 200 is fixed by the elastic interference sealing fit of the elastic ring 4 and the inner wall of the flow passage 100, the resistance is small, the pulling force is small, and the disassembly is convenient.

Preferably, as shown in fig. 10, in this embodiment, a radial protrusion 102 may be disposed radially inward on the inner wall of the flow channel 100, and an end surface of the first annular wall 12 facing away from the water inlet end forms an abutting surface; when the abutting surface abuts against the radial protrusion 102 when the flow restriction valve 200 is installed in the flow passage 100, the flow restriction valve 200 is installed in place, and the stability of the flow restriction valve 200 in use can be increased.

Example two:

as shown in fig. 11 and 12, the flow restriction valve 200 in the present embodiment is different from the first embodiment in that the flange 211 of the water stop surface cover 21 of the adjuster 2 in the present embodiment is not provided with the second tapered surface, but the silicone sleeve 5 is directly sleeved on the flange 211 of the water stop surface cover 21, the surface of the silicone sleeve 5 facing the hole shoulder 1121 forms an elastic sealing surface, and the hole shoulder 1121 of the through hole is not provided with the first tapered surface but is inwardly provided with a chamfer; when the flange 211 abuts against the hole shoulder 1121 to block the through hole 112, the elastic sealing surface can increase the sealing performance between the water stop surface cover 21 and the hole shoulder 1121, and the chamfer on the hole shoulder 1121 can prevent the hole shoulder 1121 from scratching the silicone rubber sleeve 5 when the adjusting piece 2 moves.

Compared with the first embodiment, the present embodiment requires an additional step of sleeving the silica gel sleeve 5 on the water stop surface cover 21 of the adjusting member 2, and the rest of the installation steps are the same. The use of the present embodiment is the same as the first embodiment, and has all the advantages of the first embodiment.

The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting. Modifications, equivalents and other improvements which may occur to those skilled in the art and which may be made to the embodiments of the invention or portions thereof through a reasonable analysis, inference or limited experimentation, in light of the common general knowledge, the common general knowledge in the art and/or the prior art, are intended to be within the scope of the invention.

Claims

1. The utility model provides a restriction valve, its installs in the runner, its characterized in that includes:

one end of the valve core faces the water inlet end of the flow channel, the other end of the valve core is provided with a water outlet, an inward-concave annular groove is formed in the outer wall of the valve core, and a first water passing interval is formed between the outer wall of the valve core, which is positioned between the annular groove and the end facing the water inlet end, and the flow channel;

a water outlet communicated with the water outlet is formed in the wall, close to the water outlet, of the annular groove, and a plurality of first bulges are convexly arranged at intervals at the bottom of the annular groove along the circumferential direction of the annular groove;

the elastic ring is positioned in the annular groove, sleeved outside each first bulge and positioned on the groove wall of the annular groove provided with the water passing port, and a second water passing interval is arranged between the groove wall of the annular groove far away from the water outlet and the elastic ring; the elastic ring protruding ring groove is in interference sealing fit with the inner wall of the flow channel, and the elastic ring and the first bulges are enclosed to form an overflowing gap communicated with the second water passing interval and the water passing opening.

2. The flow-limiting valve as recited in claim 1, wherein the valve core comprises a body and a first annular wall sleeved outside the body, and a space is left between the first annular wall and the body;

the body extends towards the water inlet end along the axial direction and protrudes out of the first annular wall to form a protruding part,

an annular bump is arranged on the outer wall of the protruding part along the circumferential direction, the annular bump extends along the axial direction, and the outer wall of the annular bump and the flow channel form a first water passing interval;

the end face of the first annular wall, which is close to the water inlet end, and the end face of the annular lug, which is far away from the water inlet end, are spaced from each other to form the annular groove;

the first annular wall and the body form the water passing opening therebetween.

3. The constrictor valve of claim 2, wherein the protrusion is circumferentially spaced by a plurality of first projections that form the annular projection.

4. The constrictor valve of claim 3, further comprising an adjustment member and a resilient member;

the body is provided with a through hole along the axial direction; the through hole is provided with a hole shoulder facing the water inlet end; the adjusting piece is in sliding fit with the through hole, one end of the adjusting piece is provided with a second bulge, the other end of the adjusting piece is provided with an elastic clamping jaw, and the peripheral side wall of the adjusting piece is also provided with a flange opposite to the hole shoulder;

the body is provided with a limiting surface deviating from the water inlet end so as to be in limiting fit with the elastic clamping jaw penetrating through the through hole; two ends of the elastic piece act on the body and the adjusting piece respectively,

the regulating piece is acted by the water pressure and the elastic force of the elastic piece together to slide in the through hole, and the flange is close to or propped against or far away from the hole shoulder.

5. The flow restriction valve according to claim 4, wherein the body further comprises an abutting portion in the through hole, and a third water passing space is formed between the abutting portion and the wall of the through hole; one end of the elastic piece abuts against the flange, the other end of the elastic piece abuts against the abutting part, and the elastic clamping jaw penetrates through the third water passing interval to be in spacing fit with the limiting surface.

6. The constrictor valve of claim 5, wherein the abutment is axially provided with a through-hole and the adjuster is further provided with a protruding shaft extending through the through-hole.

7. The constrictor valve of claim 4, wherein the bore shoulder is inwardly tapered to form a first taper and the flange has a second taper that mates with the bore shoulder.

8. A constrictor valve as claimed in any one of claims 4 to 7, wherein the flange is provided with a resilient sealing surface opposite the bore shoulder.

9. The constrictor valve of claim 8, wherein the flange sleeve is provided with a silicone sleeve to form the resilient sealing surface.