CN112709851A

CN112709851A - Constant flow valve

Info

Publication number: CN112709851A
Application number: CN202011635181.7A
Authority: CN
Inventors: 李文明; 杨高
Original assignee: Shenzhen Hengzhiyun Technology Co Ltd
Current assignee: Shenzhen Hengzhiyun Technology Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-04-27
Also published as: WO2022143934A1

Abstract

The invention relates to a constant flow valve, which comprises a valve body, a valve core and an elastic piece, wherein: a water inlet and a water outlet are formed on the outer side of the valve body, a first channel, a second channel and a valve port for communicating the first channel and the second channel are formed in the valve body, and the second channel is communicated with the water outlet; the valve core is arranged in the first channel, one end of the valve core along the axis of the valve core is spaced from the hole wall of the first channel, the other end of the valve core is sealed with the hole wall of the first channel in a sliding gap manner and divides the first channel into a first space and a second space, the first space is communicated with the water inlet and is communicated with one end of the second channel through the valve port, and the second space is communicated with the other end of the second channel; the elastic piece is arranged in the second space and is abutted against the opposite surfaces of the valve body and the valve core; when the water pressure changes, the two sides of the valve core are unevenly stressed and move, so that the elastic part deforms, the flow at the valve port is constant when the elastic part is balanced, the flow of water discharged from the water outlet is constant, and the flow of the output end is ensured to be constant through automatically adjusting the pressure difference.

Description

Constant flow valve

Technical Field

The invention relates to the technical field of one-way valves, in particular to a constant flow valve.

Background

Along with the continuous improvement of computer technology, automatic control technique and people's quality of life, have bath waterway system and clean waterway system and can realize ordinary washing and women abluent intelligent closestool lid to its intelligence is washd, clean health, is preheated advantages such as comfortable, convenient operation, energy-conserving power saving, receives people's favor gradually.

At present, a clean waterway system of an intelligent toilet cover comprises a water inlet valve to a just washing water waterway and a water inlet valve to a woman washing nozzle water outlet waterway, the two water outlet waterways are switched to a washing mode through a reversing assembly, pressure is constant when flow output is controlled by a pressure valve, and the working principle of the pressure valve is that the constant pressure output of the nozzle water outlet is realized by automatically adjusting a water flow section through the pressure valve. However, when the two water outlet waterway ends are reversed or any part of the waterway is slightly blocked in the existing clean waterway system, the load of the clean waterway system is easily increased, so that the water flow fluctuation of the waterway output end is large, the water outlet flow of the toilet and the bidet is unstable, the toilet and the bidet cannot be cleaned sufficiently, and the user experience is poor.

Disclosure of Invention

In view of the above, it is necessary to provide a constant flow valve to solve the problem of large fluctuation of the output water amount when the pressure of the conventional clean water path system is changed.

A constant flow valve comprising a valve body, a spool, and an elastic member, wherein:

a water inlet and a water outlet are formed on the outer side of the valve body, a first channel, a second channel and a valve port for communicating the first channel with the second channel are formed in the valve body, and the second channel is communicated with the water outlet;

the valve core is arranged in the first channel, one end of the valve core along the axis of the valve core is spaced from the hole wall of the first channel, the other end of the valve core is in sliding clearance seal with the hole wall of the first channel and divides the first channel into a first space and a second space, the first space is communicated with the water inlet and is communicated with one end of the second channel through the valve port, and the second space is communicated with the other end of the second channel;

the elastic piece is arranged in the second space and is abutted against the surface of the valve body opposite to the valve core.

In the constant flow valve, when the water pressure changes, the water pressure P1 in the first space and the water pressure P2 in the second space change, the two sides of the valve core are unevenly stressed and move, so that the elastic part deforms, the valve core stops moving when the two sides of the valve core move to the same stress, and at the moment, the pressure of the first space and the pressure of the second space are the sameThe difference Δ P-P1-P2-K (X)₀+ Δ X)/a, where the stiffness K of the elastic member and the pressure area a of the valve core are constant values, and since the deformation amount Δ X of the elastic member is much smaller than the free length X0 of the elastic member, Δ P ≈ KX₀A and is constant, flow at the valve port

Because the flow coefficient Cd, the area A1 of the valve port, the fluid density rho and the delta P are all fixed values, the flow at the valve port is constant, and the flow of the water flow entering the second channel through the valve port and discharged from the water outlet is constant. Therefore, the constant flow valve can automatically adjust the pressure difference through the inside when the water pressure changes, and the constant flow of the output end is ensured.

In one embodiment, the valve body includes a cavity and a top cover fixed to the cavity, the valve core includes a partition plate and a valve rod protruding from the partition plate, wherein:

the cavity is provided with a water inlet and a water outlet, the valve port and a first stepped hole are formed in the cavity, the valve port is positioned on one side of the water inlet, which is far away from the second space, the large hole of the first stepped hole is opened on the surface of the cavity, which faces the top cover, and the small hole of the first stepped hole extends to the water inlet and one side of the valve port, which is far away from the top cover, and is communicated with the valve port and the water inlet;

the partition plate is slidably embedded in the large hole of the first stepped hole, and the sectional area of the partition plate is not smaller than the area of the large hole of the first stepped hole along the direction perpendicular to the axis of the large hole of the first stepped hole;

the valve rod is inserted into the small hole of the first stepped hole, and the sectional area of the valve rod is smaller than the area of the small hole of the first stepped hole along the direction perpendicular to the axis of the large hole of the first stepped hole.

In one embodiment, the small hole of the first stepped hole includes a first slot hole and a first groove, the first slot hole is coaxial with the large hole of the first stepped hole and is communicated with the water inlet, the first groove is opened on the hole wall of the first slot hole and extends from the hole bottom of the large hole of the first stepped hole to the hole bottom of the first slot hole, and the first groove is communicated with the valve port.

In one embodiment, the valve rod includes a first rod part, a second rod part and a third rod part which protrude from the partition plate in sequence, the cross-sectional areas of the first rod part and the third rod part are the same and are the same as the cross-sectional area of the first slot hole along a direction perpendicular to the axis of the large hole of the first stepped hole, and the cross-sectional area of the second rod part is smaller than the cross-sectional area of the first rod part.

In one embodiment, the valve core includes a second slot, the second slot opens at an end surface of the partition plate facing away from the valve rod and extends to a certain depth towards the inside of the first rod part, and a connecting hole communicating the second slot and the second channel is formed inside the elastic element.

In one embodiment, the elastic body is a spring, a first clamping groove is formed in the partition plate, a second clamping groove is correspondingly formed in the top cover, and the spring is located in the first clamping groove and the second clamping groove.

In one embodiment, the valve core includes a second stepped hole, a large hole of the second stepped hole opens at an end surface of the third rod portion away from the second rod portion, and a small hole of the second stepped hole extends to an end of the second rod portion close to the first rod portion.

In one embodiment, the cavity defines a first through hole and a third slot, wherein:

the axis of the third slotted hole is parallel to the axis of the first stepped hole, the third slotted hole is opened on the surface of the cavity facing the top cover and extends to the water outlet and one side of the valve port far away from the top cover, and the third slotted hole is communicated with the valve port and the water outlet;

the first through hole penetrates through the cavity between the third slotted hole and the first stepped hole and is close to the top cover.

In one embodiment, the constant flow valve further comprises a switch module comprising a housing and a drive unit and a top plug disposed within the housing, wherein:

the water inlet is communicated with the first channel through a valve hole;

the shell is fixed on the valve body and communicated with the water inlet;

the driving unit is connected with the top plug and used for driving the top plug to be inserted into and tightly push the valve hole or driving the top plug to leave the valve hole.

In one embodiment, the drive unit is a solenoid valve.

Drawings

FIG. 1 is a schematic structural view of a constant flow valve according to the present invention;

FIG. 2 is an exploded view of a constant flow valve according to the present invention;

FIG. 3 is a cross-sectional view of a constant flow valve provided by the present invention;

FIG. 4 is a cross-sectional view of another constant flow valve provided by the present invention.

Reference numerals:

10. a constant flow valve;

100. a valve body; 110. a water inlet; 120. a water outlet; 130. a first channel; 131. a first space; 132. a second space; 140. a second channel; 150. a valve port; 160. a cavity; 161. a first stepped hole; 1611. a first slot; 1612. a first groove; 162. a first through hole; 163. a third slot; 164. a stud; 170. a top cover; 171. a second card slot; 172. a first cover body; 173. a second cover body; 174. a middle section; 180. a valve bore; 100A, 100B, screw holes;

200. an elastic member; 210. connecting holes; 211. a first hole; 212. a second hole; 213. a third aperture; 220. a spring; 230. an elastic column;

300. a valve core; 310. a first end; 320. a second end; 330. a partition plate; 331. a first card slot; 340. a valve stem; 341. a first rod portion; 342. a second rod portion; 343. a third rod part; 350. a second slot; 360. a second stepped bore;

400. a seal member; 410. a first stage; 420. a second stage; 430. a middleware;

500. a fastener;

600. a switch module; 610. a housing; 620. a drive unit; 621. an elastic structure; 630. a top plug;

700. a seal ring;

800. and (4) screws.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical scheme provided by the embodiment of the invention is described below by combining the accompanying drawings.

As shown in fig. 1, 2 and 3, the present invention provides a constant flow valve 10, wherein the constant flow valve 10 includes a valve body 100, an elastic member 200 and a valve core 300, and is capable of automatically adjusting a pressure difference through the inside when a water pressure changes, so as to solve a problem of a large fluctuation of a water output of a conventional clean water path system. In the constant flow valve 10:

the outer side of the valve body 100 is formed with a water inlet 110 and a water outlet 120, the water inlet 110 is connected to the waterway system, the general water flow enters from the water inlet 110 after being heated at the front end and then flows out from the water outlet 120, and the water outlet 120 is connected to other control waterways or is directly connected with a spray head for washing women and defecating.

The valve body 100 is formed with a first channel 130, a second channel 140 and a valve port 150, the valve port 150 communicates the first channel 130 and the second channel 140, the second channel 140 communicates with the water outlet 120, the first channel 130 communicates with the water inlet 110, and water flows from the water inlet 110 into the first channel 130, passes through the valve port 150 into the second channel 140, and finally flows out from the water outlet 120.

The valve core 300 is arranged inside the first channel 130, the valve core 300 is provided with a first end 310 and a second end 320 along the axis, and the first end 310 is spaced from the hole wall of the first channel 130 so as to facilitate the water flow; the second end 320 is sealed with the hole wall of the first channel 130 by a sliding gap, the end of the second end 320 divides the first channel 130 into a first space 131 and a second space 132, the first space 131 is communicated with the water inlet 110, the first space 131 is communicated with one end of the second channel 140 through the valve port 150, and the second space 132 is communicated with the other end of the second channel 140.

The elastic member 200 is disposed inside the second space 132, and the elastic member 200 abuts on the opposite surfaces of the valve body 100 and the valve spool 300, and the elastic direction of the elastic member 200 is parallel to the axis of the first passage 130.

In the constant flow valve 10, when the water pressure changes, the water pressure P1 in the first space 131 and the water pressure P2 in the second space 132 change, the two sides of the valve element 300 are unevenly stressed and move, so that the elastic element 200 deforms, when the valve element 300 moves to the two sides and is stressed identically, the movement stops, and at this time, the pressure difference Δ P between the first space 131 and the second space 132 is P1-P2K (X)₀+ Δ X)/a, wherein the stiffness K of the elastic member 200 and the pressure receiving area a of the valve element 300 are constant values, and the deformation amount Δ X of the elastic member 200 is much smaller than that of the elastic member 200Free length X0 such that Δ P ≈ KX₀A, and is a constant value, flow at valve port 150

Since the flow coefficient Cd, the area a1 of the valve port 150, the fluid density ρ and Δ P are all fixed values, the flow at the valve port 150 is constant, so that the flow of the water flowing through the valve port 150 into the second channel 140 and out of the water outlet 120 is constant. The water pressure change may be an increase or decrease in the water pressure at the input end connected to the water inlet 110, or an increase or decrease in the water pressure at the output end connected to the water outlet 120. Therefore, the constant flow valve 10 can ensure a constant flow rate at the output end by automatically adjusting the pressure difference internally when the water pressure changes.

The valve body 100 and the valve core 300 have various structural forms, as shown in fig. 1, 2 and 3, in a preferred embodiment, the valve body 100 includes a cavity 160 and a top cover 170, one end of the cavity 160 is open, the top cover 170 is fixed to the cavity 160, a sealing member 400 is disposed between the top cover 170 and the cavity 160, the sealing member 400 is disposed on the cavity 160 and is compressed between the top cover 170 and the cavity 160 when the top cover 170 is fixed to the cavity 160 by a fastening member 500 to achieve the sealing of the constant flow valve 10, and the fixing manner between the top cover 170 and the cavity 160 may be a threaded connection, a male-female fit connection or a snap-fit connection, but is not limited thereto.

The water inlet 110 is formed in one side of the cavity 160 in a protruding manner, the water outlet 120 is formed in the other side of the cavity 160 in a protruding manner, the first stepped hole 161 and the valve port 150 are formed in the cavity 160, the first stepped hole 161 and the top cover 170 form the first channel 130, the large hole of the first stepped hole 161 is opened on the surface of the cavity 160 facing the top cover 170, the small hole of the first stepped hole 161 extends to the side of the water inlet 110 and the valve port 150 away from the top cover 170, the small hole of the first stepped hole 161 is connected with the valve port 150, and the small hole of the first stepped hole 161 is further communicated with the water inlet 110.

The valve core 300 includes a partition 330 and a valve rod 340, the valve rod 340 protrudes from the partition 330, the partition 330 and the valve rod 340 may be integrally formed, for example, by injection molding, and the partition 330 and the valve rod 340 may be fixed together by a screw connection, a welding, a concave-convex fit, a snap connection, and the like. The partition 330 is embedded in the large hole of the first stepped hole 161, the partition 330 is slidable with respect to the large hole of the first stepped hole 161, and the sectional area of the partition 330 is equal to or larger than the large hole area of the first stepped hole 161 in the direction perpendicular to the axis of the first stepped hole 161 so that the partition 330 divides the first passage 130 into the first space 131 and the second space 132. The valve stem 340 is inserted into the small hole of the first stepped hole 161, and the sectional area of the valve stem 340 is smaller than the small hole area of the first stepped hole 161 in the direction perpendicular to the axis of the first stepped hole 161, and the valve stem 340 slides within the small hole of the first stepped hole 161.

In the constant flow valve 10, when the water pressure at the input end increases, the water pressure in the first space 131 increases, the water pressure in the small hole of the first stepped hole 161 pushes the valve rod 340 to move toward the second space 132, the valve rod 340 drives the partition plate 330 fixed thereto to move toward the second space 132, the elastic member 200 is compressed, the water pressure in the second space 132 increases, meanwhile, the water in the small hole of the first stepped hole 161 enters the second channel 140 through the valve port 150, enters the second space 132 through the second channel 140, the water pressure in the second space 132 continues to increase, when the valve core 300 moves to the two sides and the force is the same, at this time, the flow at the valve port 150 is constant, so that the water enters the second channel 140 through the valve port 150, and the flow of the water discharged from the water outlet 120 is constant. Therefore, by defining the structure of the valve body 100 and the valve core 300, the pressure difference can be automatically adjusted when the water pressure changes, so that the constant flow at the output end can be ensured. Of course, for other types of water pressure changes, the motion process of the valve core 300 from force balance to force non-uniformity and then back to force balance is similar, and is not described herein again.

The first stepped hole 161 has various structural forms, as shown in fig. 1, fig. 2 and fig. 3, specifically, the small hole of the first stepped hole 161 includes a first slot 1611 and a first groove 1612, the first slot 1611 is coaxial with the large hole of the first stepped hole 161, the first slot 1611 is communicated with the water inlet 110, the first groove 1612 is opened on the hole wall of the first slot 1611, the first groove 1612 extends from the hole bottom of the large hole of the first stepped hole 161 to the hole bottom of the first slot 1611, the first groove 1612 is communicated with the valve port 150, and the valve port 150 is located on the side of the water inlet 110 far away from the second space 112.

In the constant flow valve 10, when the pressure at the output end is increased, the water pressure in the second space 132 is increased, the two sides of the partition plate 330 are stressed differently, the partition plate 330 moves to push the valve rod 340 to move towards the first space 131, the water pressure in the first space 131 is increased, the water flow enters the second channel 140 through the water outlet 120, flows into the first groove 1612 through the valve port 150, and then enters the first slotted hole 1611, the water flow pushes the valve rod 340 to move towards the direction far away from the second space 132, and the valve core 300 can be pushed to move conveniently and rapidly through the two actions, so that the stress balance of the valve core 300 can be realized rapidly, the differential pressure can be adjusted rapidly and automatically, and the flow at the output end is ensured to be constant. Of course, for other types of water pressure changes, the motion process of the valve core 300 from force balance to force non-uniformity and then back to force balance is similar, and is not described herein again.

In order to facilitate the water flow, as shown in fig. 1, 2 and 3, more specifically, the valve rod 340 includes a first rod portion 341, a second rod portion 342 and a third rod portion 343, the first rod portion 341, the second rod portion 342 and the third rod portion 343 sequentially protrude from the partition plate 330, the first rod portion 341, the second rod portion 342 and the third rod portion 343 may be an integrated structure, for example, they are integrally formed by injection molding, and the first rod portion 341, the second rod portion 342 and the third rod portion 343 may be fixed into a whole by a screw connection, a welding, a concave-convex fit, a snap connection, and the like. In a direction perpendicular to the large hole axis of the first stepped hole 161, the sectional areas of the first and

third rod portions

341 and 343 are the same, and the sectional areas of the first and

third rod portions

341 and 343 and the first groove hole 1611 are the same, and the sectional area of the second rod portion 342 is smaller than the sectional area of the first rod portion 341.

In the constant flow valve 10, when the pressure at the output end increases, the water pressure in the second space 132 increases, the two sides of the partition plate 330 are subjected to different forces, the partition plate 330 moves to push the first rod portion 341, the second rod portion 342, and the third rod portion 343 to move together toward the first space 131, the water pressure in the first space 131 increases, the water flows into the second channel 140 through the water outlet 120, flows into the first groove 1612 through the valve port 150, and then enters the first slot 1611, the water flow pushes the second rod portion 342 to move in a direction away from the second space 132, the second rod portion 342 drives the first rod portion 341, the third rod portion 343, and the partition plate 330 to move together in a direction away from the second space 132, and the two functions can push the valve element 300 to move conveniently and quickly, so that the force balance of the valve element 300 can be realized quickly, and the pressure difference can be adjusted quickly and automatically, ensuring constant flow at the output. The valve stem 340 is thus configured as a first stem portion 341, a second stem portion 342 and a third stem portion 343, and defines the first stem portion 341 and the third stem portion 343 as well as the first slot 1611 in cross-sectional area, and the second stem portion 342 has a cross-sectional area smaller than that of the first stem portion 341 to facilitate the passage of water flow and the movement of the valve stem 340.

In order to improve the accuracy of the pressure adjustment, as shown in fig. 1, 2 and 3, more specifically, the valve body 300 includes a second slot 350, the second slot 350 opens to an end surface of the partition 330 facing away from the valve stem 340, and the second slot 350 extends to a certain depth toward the inside of the first stem 341, and the elastic member 200 is internally formed with a connection hole 210 communicating the second slot 350 with the second passage 140.

In the constant flow valve 10, the second slot 350 is disposed in the valve core 300, so that the weight of the valve core 300 is reduced, and the free length of the elastic member 200 is relatively large, and the connection hole 210 for connecting the second slot 350 and the second channel 140 is formed inside the elastic member 200, so that water flows through the connection hole 210 of the elastic member 200 into the second slot 350, and the second slot 350 is filled with water, thereby further increasing the free length of the elastic member 200, and the deformation amount Δ X of the elastic member 200 is much smaller than the free length X0 of the elastic member 200, so that the formula Δ P ≈ KX₀The pressure difference obtained by/A is more accurate, so that the flow at the valve port 150 is closer to constant, and the water flow entering the second channel 140 through the valve port 150 and discharged from the water outlet 120 is enabled to pass throughThe flow rate is constant. Therefore, the constant flow valve 10 has the second slot 350 in the valve core 300, which can improve the precision of pressure adjustment and ensure the constant flow rate at the output end.

The elastic member 200 has various structural forms, as shown in fig. 1, fig. 2, fig. 3 and fig. 4, more specifically, the elastic member is a spring 220, the partition 330 is provided with a first engaging groove 331, the first engaging groove 331 may be an annular structure or may be surrounded by a plurality of single bodies, the first engaging groove 331 and the partition 330 may be integrally formed, the top cover 170 is provided with a second engaging groove 171, the second engaging groove 171 may be an annular structure or may be surrounded by a plurality of single bodies, the second engaging groove 171 and the top cover 170 may be integrally formed, the first engaging groove 331 corresponds to the second engaging groove 171, and the spring 220 is located in the first engaging groove 331 and the second engaging groove 171.

In the constant flow valve 10, the first clamping groove 331 is formed in the partition plate 330, and the second clamping groove 171 is correspondingly formed in the top cover 170, so that the elastic direction of the spring 220 is limited, the spring 220 is prevented from being separated from the partition plate 330 and the top cover 170 under water flow impact, the stability of the valve core 300 in the moving process is ensured, and the structural stability and the reliability of the whole constant flow valve 10 are good. In addition, the space between the springs 220 facilitates the flow of water into the second slot 350. When specifically arranged, the elastic member 200 may be a spring 220, the spiral structure of the spring 220 forms a connection hole 210, which does not block the passage of water flow, the elastic member 200 may be an elastic column 230, the connection hole 210 may further be composed of a first hole 211, a second hole 212, and a third hole 213, the first hole 211 opens at one end of the elastic column 230 and extends along the elastic direction, the second hole 212 and the third hole 213 are respectively located at two sides of the first hole 211 and communicate with the first hole 211, and the first hole 211 and the second hole 212 respectively open at the outer surface of the elastic column 230.

In order to improve the reaction sensitivity, in a preferred embodiment, as shown in fig. 3 and 4, the valve spool 300 includes a second stepped hole 360, a large hole of the second stepped hole 360 opens to an end surface of the third rod portion 343 away from the second rod portion 342, and a small hole of the second stepped hole 360 extends to an end of the second rod portion 342 close to the first rod portion 341.

The constant flow valve 10In the above-mentioned embodiment, by providing the second stepped hole 360 in the valve element 300, on the one hand, the weight of the valve element 300 is reduced, so that the free length of the elastic member 200 is large, so that the deformation amount Δ X of the elastic member 200 is much smaller than the free length X0 of the elastic member 200, so that the formula Δ P ≈ KX₀The pressure difference obtained by the/A is more accurate, so that the flow at the valve port 150 is more close to constant, and on the other hand, water enters the second stepped hole 360 when flowing between the third rod part 343 and the first slotted hole 1611 through the first groove 1612, so that the second stepped hole 360 is filled with water, the valve element 300 can be pushed to move conveniently and quickly, the stress balance of the valve element 300 can be quickly realized, the pressure difference can be quickly and automatically adjusted, and the flow at the output end is ensured to be constant. Therefore, the constant flow valve 10 has the second slot 350 in the valve core 300, so that the accuracy of pressure adjustment can be improved, the flow rate of the output end is ensured to be constant, the pressure difference can be adjusted quickly, and the response sensitivity is improved.

The structural form of the second channel 140 has a plurality of forms, and in a preferred embodiment, as shown in fig. 3 and 4, the cavity 160 is opened with a first through hole 162 and a third slot 163, wherein:

the axis of the third slot 163 is parallel to the axis of the first step hole 161, the third slot 163 opens on the surface of the cavity 160 facing the top cover 170, the third slot 163 and the top cover 170 form the second channel 140, and the third slot 163 extends to the water outlet 120 and the side of the valve port 150 away from the top cover 170, the third slot 163 communicates with the valve port 150, and the third slot 163 communicates with the water outlet 120;

the first through hole 162 penetrates the cavity 160 between the third slot hole 163 and the first stepped hole 161, and the first through hole 162 is disposed adjacent to the top cover 170. When specifically arranged, the top cover 170 has a first cover 172, a second cover 173 and an intermediate section 174 connecting the first cover 172 and the second cover 173, the sealing member 400 includes a first section 410, a second section 420 and an intermediate member 430 matching with the first section, the first cover 172 matches with the first stepped hole 161, the second cover 173 matches with the third stepped hole 163, the intermediate section 174 corresponds to the first through hole 162 on the cavity 160, a stud 164 for fixing the fastener 500 is provided in the first through hole 162, the top cover 170 is provided with a screw hole 100A, the cavity 160 is provided with a screw hole 100B, and the first cover 172, the second cover 173 and the intermediate section 174 are hermetically fixed on the cavity 160 by the fastener 500.

In the constant flow valve 10, the water flows into the small holes of the first stepped hole 161 through the water inlet 110, when there is a pressure difference between the first space 131 and the second space 132, the water pressure in the small hole of the first stepped hole 161 pushes the valve rod 340 to move toward the second space 132, the valve rod 340 drives the partition plate 330 fixed thereto to move toward the second space 132, the elastic member 200 is compressed, the water pressure in the second space 132 increases, meanwhile, the water in the small hole of the first stepped hole 161 flows through the valve port 150 into the third slot hole 163, and flows from the third slot hole 163 into the second space 132 through the first through hole 162, so that the water pressure in the second space 132 continues to increase, when the valve core 300 moves to both sides and the force is the same, the valve core stops moving, at this time, the flow at the valve port 150 is constant, so that the flow rate of the water flowing through the valve port 150 into the third slot 163 and discharged from the water outlet 120 is constant. Therefore, the structure defining the first through hole 162 and the third slot 163 can automatically adjust the pressure difference when the water pressure changes, conveniently and quickly, and ensure the constant flow rate at the output end.

To facilitate the control of the switching of the constant flow valve 10, as shown in fig. 1, 2, 3 and 4, in a preferred embodiment, the constant flow valve 10 further includes a switching module 600, the switching module 600 includes a housing 610, and a driving unit 620 and a top plug 630 disposed in the housing 610, wherein:

the water inlet 110 communicates with the first passage 130 through the valve hole 180;

the housing 610 is fixed on the valve body 100, and the housing 610 is communicated with the water inlet 110; in the specific arrangement, a sealing ring 700 is arranged between the shell 610 and the valve body 100, and the shell 610 and the valve body 100 are fixed into a whole through a screw 800;

the driving unit 620 is connected with the top plug 630, the driving unit 620 is used for driving the top plug 630 to be inserted into and tightly pressed against the valve hole 180, and the driving unit 620 is used for driving the top plug 630 to be separated from the valve hole 180.

In the above-mentioned constant flow valve 10, rivers enter into the water inlet 110, when drive unit 620 drives the top plug 630 and inserts and push up tight valve opening 180, the water route does not conduct, rivers stop in the water inlet 110, drive unit 620 moves and drives the top plug 630 and shifts out from the valve opening 180, make the top plug 630 keep away from the valve opening 180, the valve opening 180 is opened, rivers in the water inlet 110 enter into first passageway 130 through the valve opening 180, so that water inlet 110 and first passageway 130 communicate, therefore, can control the switch of constant flow valve 10 more conveniently through setting up above-mentioned switch module 600.

To achieve the automatic control, as shown in fig. 1, 2, 3 and 4, the driving unit 620 may be specifically a solenoid valve, a magnetic force generated by energizing the solenoid valve attracts the plug 630 away from the valve hole 180 to open the valve hole 180, an elastic structure 621 inside the solenoid valve pushes the plug 630 to be inserted into the valve hole 180 by de-energizing the solenoid valve, and the plug 630 tightly pushes the valve hole 180 to close the valve hole 180. Of course, the driving switch is not limited to the electromagnetic valve, and may be a manual switch or a motor-controlled switch.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A constant flow valve, comprising a valve body, a valve spool, and an elastic member, wherein:

2. The constant flow valve according to claim 1, wherein the valve body comprises a chamber and a top cover fixed to the chamber, the valve core comprises a partition plate and a valve stem protruding from the partition plate, wherein:

3. The constant flow valve according to claim 2, wherein the small hole of the first stepped hole comprises a first slot hole and a first groove, the first slot hole is coaxial with the large hole of the first stepped hole and is communicated with the water inlet, the first groove is opened on the hole wall of the first slot hole and extends from the bottom of the large hole of the first stepped hole to the bottom of the first slot hole, and the first groove is communicated with the valve port.

4. The constant flow valve of claim 3 wherein the valve stem includes a first stem portion, a second stem portion and a third stem portion projecting from the baffle in sequence, the first stem portion and the third stem portion having the same cross-sectional area in a direction perpendicular to the axis of the large hole of the first stepped hole and the same cross-sectional area as the first slotted hole, the second stem portion having a cross-sectional area smaller than the first stem portion.

5. The constant flow valve of claim 4 wherein the spool includes a second slot opening to an end surface of the diaphragm facing away from the valve stem and extending a depth into the interior of the first stem portion, the resilient member forming a connection bore therein communicating the second slot with the second passage.

6. The constant flow valve of claim 5 wherein the resilient member is a spring, the baffle has a first detent, the top cap has a second detent, and the spring is disposed in the first detent and the second detent.

7. The constant flow valve of claim 4 wherein the spool includes a second stepped bore, a large bore of the second stepped bore opens at an end face of the third stem portion distal from the second stem portion, and a small bore of the second stepped bore extends to an end of the second stem portion proximal to the first stem portion.

8. The constant flow valve according to claim 2, characterized in that said cavity is provided with a first through hole and a third slotted hole, wherein:

9. The constant flow valve according to claim 1, further comprising a switch module comprising a housing and a drive unit and a top plug disposed within the housing, wherein:

the water inlet is communicated with the first channel through a valve hole;

the shell is fixed on the valve body and communicated with the water inlet;

10. Constant flow valve according to claim 9, characterised in that said drive unit is a solenoid valve.