Constant flow valve

Abstract

The present invention relates to a constant flow valve, comprising a valve body, a valve core and an elastic member, wherein: an inlet and an outlet are formed on the outer side of the valve body, and a first channel, a second channel and a valve port communicating the first channel and the second channel are formed inside the valve body, and the second channel is communicated with the outlet; the valve core is arranged in the first channel, one end along its axis is spaced from the pore wall of the first channel, and the other end is in sliding clearance seal with the pore 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 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 member is arranged in the second space and abuts against the opposite surfaces of the valve body and the valve core; when the water pressure changes, the forces on both sides of the valve core are uneven and the valve core moves, so that the elastic member deforms, and at equilibrium, the flow rate at the valve port is constant and the water flow rate discharged from the outlet is constant, and by automatically adjusting the pressure difference, the flow rate at the output end is ensured to be constant.

Description

Technical Field

[0001] The present invention relates to the technical field of one-way valves, and particularly to a constant flow valve. Background Art

[0002] With the continuous improvement of computer technology, automatic control technology and people's living standards, intelligent toilet covers with flushing waterway systems and cleaning waterway systems that can achieve ordinary cleaning and female cleaning have gradually gained people's favor for their advantages such as intelligent cleaning, cleanliness, preheating comfort, convenient operation, energy saving and power saving.

[0003] At present, the cleaning waterway system of an intelligent toilet cover includes a water inlet valve to the bidet water outlet waterway and a water inlet valve to the feminine wash nozzle water outlet waterway. These two parts of the water outlet waterways switch the cleaning mode through a reversing component, and a pressure valve is used to control the constant pressure of the flow output. The working principle of the pressure valve is to automatically adjust the water flow cross-section to achieve a constant pressure output of the water from the nozzle. However, in the existing cleaning waterway system, when reversing at the end of the two parts of the water outlet waterways or when there is a slight blockage in any part of the waterway, it is easy to cause an increase in the load of the cleaning waterway system, resulting in a large fluctuation in the water flow rate at the waterway output end, manifested as unstable water output flow rates for bidet and feminine wash, and insufficient cleaning, leading to a poor user experience. Summary of the Invention

[0004] Based on this, in view of the problem of large fluctuations in the output water volume when the pressure of the existing cleaning waterway system changes, it is necessary to provide a constant flow valve.

[0005] A constant flow valve includes a valve body, a valve core and an elastic member, wherein:

[0006] An inlet and an outlet are formed on the outer side of the valve body, and a first channel, a second channel and a valve port communicating the first channel and the second channel are formed inside the valve body. The second channel is communicated with the outlet.

[0007] The valve core is arranged in the first channel, one end along its axis is spaced from the pore wall of the first channel, and the other end is in sliding clearance seal with the pore 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 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.

[0008] The elastic member is arranged in the second space and abuts against the opposite surfaces of the valve body and the valve core.

[0009] In the above 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 forces on both sides of the valve core are uneven, causing the valve core to move, deforming the elastic member. When the valve core moves until the forces on both sides are equal, it stops moving. At this time, the pressure difference ΔP between the first space and the second space is ΔP = P1 - P2 = K(X0 + ΔX) / A, where K is the stiffness of the elastic member and A is the pressure-receiving area of the valve core, both of which are constant values. Since the deformation amount ΔX of the elastic member is much smaller than the free length X0 of the elastic member, ΔP≈KX0 / A, and it is a constant value. The flow rate at the valve port Since the flow coefficient Cd, the area A1 of the valve port, the fluid density ρ, and ΔP are all constant values, the flow rate at the valve port is constant, so that the flow rate of the water flowing through the valve port into the second channel and discharged from the water outlet is constant. Therefore, the above constant flow valve can automatically adjust the pressure difference internally when the water pressure changes to ensure a constant flow rate at the output end.

[0010] 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 stem protruding from the partition plate, where:

[0011] The cavity forms a water inlet and the water outlet, and internally forms the valve port and a first stepped hole. The valve port is located on the side of the water inlet away from the second space. The large hole of the first stepped hole opens on the surface of the cavity facing the top cover, and the small hole of the first stepped hole extends to the water inlet and the side of the valve port away from the top cover, and is connected to the valve port and the water inlet;

[0012] The partition plate is slidably embedded in 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 cross-sectional area of the partition plate is not less than the area of the large hole of the first stepped hole;

[0013] The valve stem is inserted into the small hole of the first stepped hole. Along the direction perpendicular to the axis of the large hole of the first stepped hole, the cross-sectional area of the valve stem is smaller than the area of the small hole of the first stepped hole.

[0014] 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 connected to the water inlet. The first groove opens 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. The first groove is connected to the valve port.

[0015] In one embodiment, the valve stem includes a first rod portion, a second rod portion, and a third rod portion that sequentially protrude from the partition plate. Along the direction perpendicular to the axis of the large hole of the first stepped hole, the cross-sectional areas of the first rod portion and the third rod portion are the same and are the same as the cross-sectional area of the first slot hole, and the cross-sectional area of the second rod portion is smaller than the cross-sectional area of the first rod portion.

[0016] In one embodiment, the valve core includes a second slot hole that opens on the end face of the partition plate facing away from the valve stem and extends a certain depth into the interior of the first rod portion. A connection hole communicating the second slot hole and the second channel is formed inside the elastic member.

[0017] In one embodiment, the elastic member is a spring. A first card slot is provided on the partition plate, and a second card slot is correspondingly provided on the top cover. The spring is located in the first card slot and the second card slot.

[0018] In one embodiment, the valve core includes a second stepped hole. The large hole of the second stepped hole opens on the end face of the third rod portion away from the second rod portion, and the small hole of the second stepped hole extends to one end of the second rod portion close to the first rod portion.

[0019] In one embodiment, the cavity is provided with a first through hole and a third slot hole, where:

[0020] The axis of the third slot hole is parallel to the axis of the first stepped hole, opens on the surface of the cavity facing the top cover, and extends to the water outlet and the side of the valve port away from the top cover. The third slot hole communicates the valve port and the water outlet;

[0021] The first through hole penetrates the cavity between the third slot hole and the first stepped hole and is close to the top cover.

[0022] In one embodiment, the constant flow valve further includes a switch module. The switch module includes a housing, a driving unit, and a top plug disposed inside the housing, where:

[0023] The water inlet is communicated with the first channel through a valve hole;

[0024] The housing is fixed on the valve body and is communicated with the water inlet;

[0025] The driving unit is connected to the top plug and is used to drive the top plug to insert and tightly press the valve hole or drive the top plug away from the valve hole.

[0026] In one embodiment, the driving unit is an electromagnetic valve. Description of the Drawings

[0027] Figure 1 Structural schematic diagram of a constant flow valve provided by the present invention;

[0028] Figure 2 Explosion schematic diagram of a constant flow valve provided by the present invention;

[0029] Figure 3 Cross-sectional view of a constant flow valve provided by the present invention;

[0030] Figure 4 Cross-sectional view of another constant flow valve provided by the present invention.

[0031] Reference numerals:

[0032] 10. Constant flow valve;

[0033] 100. Valve body; 110. Water inlet; 120. Water outlet; 130. First channel; 131. First space; 132. Second space; 140. Second channel; 150. Valve port; 160. Cavity; 161. First stepped hole; 1611. First slot hole; 1612. First groove; 162. First through hole; 163. Third slot hole; 164. Stud; 170. Top cover; 171. Second card slot; 172. First cover body; 173. Second cover body; 174. Intermediate section; 180. Valve hole; 100A, 100B. Screw holes;

[0034] 200. Elastic member; 210. Connecting hole; 211. First hole; 212. Second hole; 213. Third hole; 220. Spring; 230. Elastic column;

[0035] 300. Valve core; 310. First end; 320. Second end; 330. Partition; 331. First card slot; 340. Valve rod; 341. First rod portion; 342. Second rod portion; 343. Third rod portion; 350. Second slot hole; 360. Second stepped hole;

[0036] 400. Sealing member; 410. First section; 420. Second section; 430. Intermediate member;

[0037] 500. Fastener;

[0038] 600. Switch module; 610. Housing; 620. Driving unit; 621. Elastic structure; 630. Plug;

[0039] 700. Sealing ring;

[0040] 800. Screw. Detailed implementation manners

[0041] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be provided in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0044] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0047] The technical solutions provided by the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] As Figure 1 、 Figure 2 and Figure 3 shown, the present invention provides a constant flow valve 10, which includes a valve body 100, an elastic member 200 and a valve core 300, and can automatically adjust the pressure difference inside when the water pressure changes to solve the problem of large fluctuations in the output water volume of the existing cleaning water circuit system. In this constant flow valve 10:

[0049] An inlet 110 and an outlet 120 are formed on the outer side of the valve body 100. The inlet 110 is connected to the water circuit system. Generally, the water flows through the front end and is heated and then enters from the inlet 110 and flows out from the outlet 120. The outlet 120 is connected to other control water circuits or directly connected to the feminine wash and bidet nozzles.

[0050] A first channel 130, a second channel 140 and a valve port 150 are formed in the valve body 100. The valve port 150 communicates the first channel 130 and the second channel 140. The second channel 140 is connected to the outlet 120, and the first channel 130 is connected to the inlet 110. The water flow enters the first channel 130 from the inlet 110, passes through the valve port 150 and enters the second channel 140, and finally flows out from the outlet 120.

[0051] The valve core 300 is disposed inside the first channel 130. The valve core 300 has a first end 310 and a second end 320 along its axis. The first end 310 is spaced from the inner wall of the first channel 130 to facilitate the water flow through; the second end 320 is in sliding clearance seal with the inner wall of the first channel 130. 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 connected to the inlet 110, and the first space 131 is connected to one end of the second channel 140 through the valve port 150. The second space 132 is connected to the other end of the second channel 140.

[0052] The elastic member 200 is disposed inside the second space 132, and the elastic member 200 abuts against the opposing surfaces of the valve body 100 and the valve core 300. The elastic direction of the elastic member 200 is parallel to the axis of the first passage 130.

[0053] In the above 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, and the forces on both sides of the valve core 300 are uneven, causing it to move, so that the elastic member 200 deforms. When the valve core 300 moves until the forces on both sides are the same, it stops moving. At this time, the pressure difference ΔP = P1 - P2 = K(X0 + ΔX) / A between the first space 131 and the second space 132, where the stiffness K of the elastic member 200 and the pressure-receiving area A of the valve core 300 are constant values. Since the deformation amount ΔX of the elastic member 200 is much smaller than the free length X0 of the elastic member 200, ΔP≈KX0 / A, and it is a constant value. The flow rate at the valve port 150 Since the flow coefficient Cd, the area A1 of the valve port 150, the fluid density ρ, and ΔP are all constant values, the flow rate at the valve port 150 is constant, so that the water flow rate entering the second passage 140 through the valve port 150 and discharged from the water outlet 120 is constant. The change in water pressure can 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 above constant flow valve 10 can automatically adjust the pressure difference inside when the water pressure changes to ensure a constant flow rate at the output end.

[0054] The structural forms of the valve body 100 and the valve core 300 are diverse, such as Figure 1 , Figure 2 and Figure 3 As shown, 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, and the top cover 170 is fixed to the cavity 160. A seal 400 is provided between the top cover 170 and the cavity 160. The seal 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 fastener 500 to achieve the sealing of the above constant flow valve 10. The fixing method between the top cover 170 and the cavity 160 can be threaded connection, concave-convex fit or snap connection, but is not limited thereto.

[0055] One side of the cavity 160 protrudes to form a water inlet 110, and the other side of the cavity 160 protrudes to form a water outlet 120. A first stepped hole 161 and a valve port 150 are formed inside the cavity 160. The first stepped hole 161 and the top cover 170 form a first channel 130. The large hole of the first stepped hole 161 opens 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, and the small hole of the first stepped hole 161 is connected to the valve port 150. The small hole of the first stepped hole 161 is also communicated with the water inlet 110.

[0056] The valve core 300 includes a partition plate 330 and a valve stem 340. The valve stem 340 protrudes from the partition plate 330. The partition plate 330 and the valve stem 340 can be of an integral structure, for example, integrally formed by injection molding. The partition plate 330 and the valve stem 340 can also be fixed together by means such as threaded connection, welding, concave-convex fitting, and snap connection. The partition plate 330 is embedded in the large hole of the first stepped hole 161. The partition plate 330 is slidable relative to the large hole of the first stepped hole 161, and in the direction perpendicular to the axis of the first stepped hole 161, the cross-sectional area of the partition plate 330 is equal to or greater than the area of the large hole of the first stepped hole 161, so that the partition plate 330 divides the first channel 130 into a first space 131 and a second space 132. The valve stem 340 is inserted into the small hole of the first stepped hole 161, and in the direction perpendicular to the axis of the first stepped hole 161, the cross-sectional area of the valve stem 340 is smaller than the area of the small hole of the first stepped hole 161, and the valve stem 340 slides in the small hole of the first stepped hole 161.

[0057] In the above constant flow valve 10, water flows through the water inlet 110 into the small hole of the first stepped hole 161. When the water pressure at the input end increases, the water pressure in the first space 131 increases. The water flow pressure in the small hole of the first stepped hole 161 pushes the valve stem 340 to move towards the second space 132. The valve stem 340 drives the partition plate 330 fixed thereto to move towards the second space 132 accordingly. The elastic member 200 is compressed, and the water pressure in the second space 132 increases. At the same time, the water flow in the small hole of the first stepped hole 161 passes through the valve port 150 into the second channel 140 and enters the second space 132 through the second channel 140, so that the water pressure in the second space 132 continues to increase. When the valve core 300 moves to the position where the forces on both sides are the same and stops moving, at this time, the flow rate at the valve port 150 is constant, so that the water flow passing through the valve port 150 into the second channel 140 and discharged from the water outlet 120 has a constant flow rate. Therefore, by defining the structures of the above valve body 100 and valve core 300, it is possible to automatically adjust the pressure difference conveniently and quickly when the water pressure changes, ensuring a constant flow rate at the output end. Of course, for other types of water pressure changes, the movement process of the valve core 300 from force balance to force imbalance and then back to force balance is similar and will not be elaborated here.

[0058] The structural form of the first stepped hole 161 has various types, such as Figure 1 , Figure 2 and Figure 3 As shown, specifically, the small hole of the first stepped hole 161 includes a first groove hole 1611 and a first groove 1612. The first groove hole 1611 is coaxial with the large hole of the first stepped hole 161, and the first groove hole 1611 is communicated with the water inlet 110. The first groove 1612 opens on the hole wall of the first groove hole 1611, and the first groove 1612 extends from the bottom of the large hole of the first stepped hole 161 to the bottom of the first groove hole 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 away from the second space 112.

[0059] In the above constant flow valve 10, when the pressure at the output end increases, the water pressure in the second space 132 increases. The forces on both sides of the partition 330 are different, and the partition 330 moves to push the valve stem 340 towards the first space 131. The water pressure in the first space 131 increases, and the water flow passes through the water outlet 120 and enters the second channel 140, and then flows through the valve port 150 into the first groove 1612, and then enters the first groove hole 1611. This part of the water flow pushes the valve stem 340 to move in the direction away from the second space 132. Through these two parts of actions, it is more convenient and fast to push the valve core 300 to move, so that the force balance of the valve core 300 can be quickly achieved, and then the pressure difference can be quickly and automatically adjusted to ensure the constant flow at the output end. Of course, for other types of water pressure changes, the movement process of the valve core 300 from force balance to force imbalance and then back to force balance is similar and will not be elaborated here.

[0060] For the convenience of water flow through, as Figure 1 , Figure 2 and Figure 3 As shown, more specifically, the valve stem 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 protrude from the partition 330 in sequence. The first rod portion 341, the second rod portion 342 and the third rod portion 343 can be of an integral structure, for example, integrally formed by injection molding. The first rod portion 341, the second rod portion 342 and the third rod portion 343 can also be fixed into one body by means of threaded connection, welding, concave-convex fit, snap connection, etc. Along the direction perpendicular to the axis of the large hole of the first stepped hole 161, the cross-sectional areas of the first rod portion 341 and the third rod portion 343 are the same, and the cross-sectional areas of the first rod portion 341 and the third rod portion 343 are the same as that of the first groove hole 1611, and the cross-sectional area of the second rod portion 342 is smaller than that of the first rod portion 341.

[0061] In the above-mentioned constant flow valve 10, when the pressure at the output end increases, the water pressure in the second space 132 increases. The forces on both sides of the partition plate 330 are different, and the partition plate 330 moves to push the first rod portion 341, the second rod portion 342, and the third rod portion 343 together towards the first space 131. The water pressure in the first space 131 increases, and the water flow passes through the water outlet 120 and enters the second channel 140, and then flows through the valve port 150 into the first groove 1612, and then enters the first slot hole 1611. This part of the water flow pushes the second rod portion 342 to move 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 together to move away from the second space 132. These two parts of the action can more conveniently and quickly push the valve core 300 to move, so as to quickly achieve the force balance of the valve core 300, and then can quickly and automatically adjust the pressure difference to ensure that the flow rate at the output end is constant. Therefore, the valve rod 340 is set in the structural form of the first rod portion 341, the second rod portion 342, and the third rod portion 343, and it is specified that the cross-sectional areas of the first rod portion 341 and the third rod portion 343 are the same as that of the first slot hole 1611, and the cross-sectional area of the second rod portion 342 is smaller than that of the first rod portion 341, so as to facilitate the passage of water flow and the movement of the valve rod 340.

[0062] In order to improve the accuracy of pressure regulation, as Figure 1 , Figure 2 and Figure 3 shown, more specifically, the valve core 300 includes a second slot hole 350. The second slot hole 350 opens on the end face of the partition plate 330 facing away from the valve rod 340, and the second slot hole 350 extends into the interior of the first rod portion 341 to a certain depth. A connection hole 210 communicating the second slot hole 350 and the second channel 140 is formed inside the elastic member 200.

[0063] In the above-mentioned constant flow valve 10, by providing the second slot hole 350 in the valve core 300, on the one hand, the weight of the valve core 300 is reduced, so that the free length of the elastic member 200 is larger. On the other hand, combined with the connection hole 210 formed inside the elastic member 200 to communicate the second slot hole 350 and the second channel 140, the water flow passes through the connection hole 210 of the elastic member 200 and enters the second slot hole 350, so that the second slot hole 350 is filled with water, further increasing the free length of the elastic member 200, so that the deformation amount ΔX of the elastic member 200 is much smaller than the free length X0 of the elastic member 200, making the pressure difference obtained by the formula ΔP≈KX0 / A more accurate, and further making the flow rate at the valve port 150 closer to being constant, so that the water flow rate passing through the valve port 150 and entering the second channel 140 and discharged from the water outlet 120 is constant. Therefore, by providing the second slot hole 350 in the valve core 300 of the above-mentioned constant flow valve 10, the accuracy of pressure regulation can be improved, and the flow rate at the output end can be ensured to be constant.

[0064] The structural form of the elastic member 200 has various types, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, more specifically, the elastic member 200 is a spring 220. A first card slot 331 is provided on the partition plate 330. The first card slot 331 can be a ring structure or can be surrounded by multiple monomers. The first card slot 331 and the partition plate 330 can be integrally formed. A second card slot 171 is provided on the top cover 170. The second card slot 171 can be a ring structure or can be surrounded by multiple monomers. The second card slot 171 and the top cover 170 can be integrally formed. The first card slot 331 and the second card slot 171 correspond to each other, and the spring 220 is located in the first card slot 331 and the second card slot 171.

[0065] In the above-mentioned constant flow valve 10, by providing the first card slot 331 on the partition plate 330 and correspondingly providing the second card slot 171 on the top cover 170, the elastic direction of the spring 220 is limited, preventing the spring 220 from detaching from the partition plate 330 and the top cover 170 under the impact of water flow, ensuring the stability of the movement process of the valve core 300, and thus making the structural stability and reliability of the entire constant flow valve 10 better. In addition, the space between the springs 220 enables the water flow to more conveniently enter the second slot hole 350. In specific settings, the elastic member 200 can 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 can be an elastic column 230. The connection hole 210 can also 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 on both sides of the first hole 211 and are communicated with the first hole 211. The first hole 211 and the second hole 212 respectively open on the outer surface of the elastic column 230.

[0066] In order to improve the reaction sensitivity, in a preferred embodiment, such as Figure 3 and Figure 4 As shown, the valve core 300 includes a second stepped hole 360. The large hole of the second stepped hole 360 opens at the end face of the third rod portion 343 away from the second rod portion 342, and the small hole of the second stepped hole 360 extends to one end of the second rod portion 342 close to the first rod portion 341.

[0067] In the above constant flow valve 10, by providing a second stepped hole 360 in the valve core 300, on the one hand, the weight of the valve core 300 is reduced, so that the free length of the elastic member 200 is larger, and thus the deformation amount ΔX of the elastic member 200 is much smaller than the free length X0 of the elastic member 200, making the pressure difference obtained by the formula AP≈KX0 / A more accurate, and further making the flow rate at the valve port 150 closer to being constant. On the other hand, when water flows through the first groove 1612 to between the third rod portion 343 and the first slot hole 1611, it enters the second stepped hole 360, so that the second stepped hole 360 is filled with water, which can more conveniently and quickly push the valve core 300 to move, so that the force balance of the valve core 300 can be quickly achieved, and further the pressure difference can be quickly and automatically adjusted to ensure that the flow rate at the output end is constant. Therefore, the above constant flow valve 10 provided with the second slot hole 350 in the valve core 300 can improve the accuracy of pressure regulation, ensure that the flow rate at the output end is constant, and can quickly adjust the pressure difference and improve the reaction sensitivity.

[0068] The structural form of the second channel 140 has various types. A preferred embodiment is as Figure 3 and Figure 4 shown. The cavity 160 is provided with a first through hole 162 and a third slot hole 163, where:

[0069] The axis of the third slot hole 163 is parallel to the axis of the first stepped hole 161. The third slot hole 163 opens on the surface of the cavity 160 facing the top cover 170. The third slot hole 163 and the top cover 170 form the second channel 140, and the third slot hole 163 extends to the water outlet 120 and the side of the valve port 150 away from the top cover 170. The third slot hole 163 communicates with the valve port 150, and the third slot hole 163 communicates with the water outlet 120;

[0070] 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 arranged close to the top cover 170. When specifically arranged, the top cover 170 has a first cover body 172, a second cover body 173 and an intermediate section 174 connecting the first cover body 172 and the second cover body 173. The sealing member 400 includes a first section 410, a second section 420 and an intermediate member 430 that match it. The first cover body 172 matches the first stepped hole 161, the second cover body 173 matches the third slot 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 arranged in the first through hole 162. A screw hole 100A is provided on the top cover 170, and a screw hole 100B is provided on the cavity 160. The first cover body 172, the second cover body 173 and the intermediate section 174 are hermetically fixed on the cavity 160 through the fastener 500.

[0071] In the above-mentioned constant flow valve 10, water flows through the water inlet 110 into the small hole of the first stepped hole 161. 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 stem 340 to move towards the second space 132. The valve stem 340 drives the partition plate 330 fixed thereto to move towards the second space 132 accordingly, and the elastic member 200 is compressed. The water pressure in the second space 132 increases. At the same time, the water flow in the small hole of the first stepped hole 161 passes through the valve port 150 into the third slot hole 163, and enters the second space 132 from the third slot hole 163 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 until the forces on both sides are the same and then stops moving, at this time, the flow rate at the valve port 150 is constant, so that the water flow rate passing through the valve port 150 into the third slot hole 163 and discharged from the water outlet 120 is constant. Therefore, by defining the structures of the above-mentioned first through hole 162 and the third slot hole 163, it is possible to automatically adjust the pressure difference more conveniently and quickly when the water pressure changes, ensuring a constant flow rate at the output end.

[0072] In order to facilitate the control of the opening and closing of the above-mentioned constant flow valve 10, as Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, in a preferred embodiment, the constant flow valve 10 further includes a switch module 600. The switch module 600 includes a housing 610, a driving unit 620 and a plug 630 arranged in the housing 610, wherein:

[0073] The water inlet 110 is communicated with the first channel 130 through the valve hole 180;

[0074] The housing 610 is fixed on the valve body 100 and is communicated with the water inlet 110; in specific settings, a sealing ring 700 is arranged between the housing 610 and the valve body 100, and the housing 610 and the valve body 100 are fixed together by screws 800;

[0075] The driving unit 620 is connected to the plug 630. The driving unit 620 is used to drive the plug 630 to insert into and tightly press the valve hole 180, and the driving unit 620 is used to drive the plug 630 to leave the valve hole 180.

[0076] In the above-mentioned constant flow valve 10, when water flows into the water inlet 110 and the driving unit 620 drives the top plug 630 to insert and press against the valve hole 180, the water path is blocked and the water flows within the water inlet 110. The driving unit 620 actuates and drives the top plug 630 to move out of the valve hole 180, so that the top plug 630 is away from the valve hole 180. The valve hole 180 opens, and the water in the water inlet 110 passes through the valve hole 180 and enters the first channel 130, so that the water inlet 110 and the first channel 130 are connected. Therefore, by setting the above-mentioned switch module 600, the switch of the constant flow valve 10 can be controlled more conveniently.

[0077] In order to realize automatic control, Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, specifically, the driving unit 620 may be a solenoid valve, which generates magnetic force by energizing the solenoid valve to attract the top plug 630 away from the valve hole 180 to open the valve hole 180, and the elastic structure 621 inside the solenoid valve pushes the top plug 630 to be inserted into the valve hole 180 by de-energizing the solenoid valve, and the top plug 630 presses against the valve hole 180 to close the valve hole 180. Of course, the driving switch is not limited to the above-mentioned solenoid valve, and may also be a manual switch or a motor-controlled switch.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A constant flow valve, characterized in that, It includes a valve body, a valve core and an elastic member, where: An inlet and an outlet are formed on the outer side of the valve body, and a first channel, a second channel and a valve port connecting the first channel and the second channel are formed inside the valve body. The second channel is communicated with the outlet. The valve core is arranged in the first channel. One end along its axis is spaced from the pore wall of the first channel, and the other end is in sliding clearance seal with the pore 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 inlet and is communicated with one end of the second channel through the valve port. The second space is communicated with the other end of the second channel. The elastic member is arranged in the second space and abuts against the opposite surfaces of the valve body and the valve core. The valve body includes a cavity and a top cover fixed to the cavity. The valve core includes a partition plate and a valve stem protruding from the partition plate. One end of the cavity is open, and a seal is arranged between the top cover and the cavity. The seal is pressed between the top cover and the cavity, where: The cavity forms the inlet and the outlet, and the valve port and a first stepped hole are formed inside. The valve port is located on the side of the inlet away from the second space. The large hole of the first stepped hole opens on the surface of the cavity facing the top cover. The small hole of the first stepped hole extends to the inlet and the side of the valve port away from the top cover and is communicated with the valve port and the inlet. The partition plate is slidably embedded in 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 cross-sectional area of the partition plate is not less than the area of the large hole of the first stepped hole. The valve stem is inserted into the small hole of the first stepped hole. Along the direction perpendicular to the axis of the large hole of the first stepped hole, the cross-sectional area of the valve stem is smaller than the area of the small hole of the first stepped hole.

2. The constant flow valve according to claim 1, wherein 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 inlet. The first groove opens on the pore 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. The first groove is communicated with the valve port.

3. The constant flow valve according to claim 2, wherein The valve stem includes a first rod portion, a second rod portion and a third rod portion protruding from the partition plate in sequence. Along the direction perpendicular to the axis of the large hole of the first stepped hole, the cross-sectional areas of the first rod portion and the third rod portion are the same and are the same as the cross-sectional area of the first slot hole. The cross-sectional area of the second rod portion is smaller than the cross-sectional area of the first rod portion.

4. The constant flow valve according to claim 3, characterized in that, The valve core includes a second slot hole. The second slot hole opens on the end face of the partition plate facing away from the valve stem and extends a certain depth into the interior of the first rod portion. A connecting hole communicating the second slot hole and the second channel is formed inside the elastic member.

5. The constant flow valve according to claim 4, characterized in that, The elastic member is a spring. A first card slot is arranged on the partition plate, and a second card slot is correspondingly arranged on the top cover. The spring is located in the first card slot and the second card slot.

6. The constant flow valve according to claim 3, wherein The spool includes a second stepped hole, the large hole of the second stepped hole opens at the end face of the third rod portion away from the second rod portion, and the small hole of the second stepped hole extends to one end of the second rod portion close to the first rod portion.

7. The constant flow valve according to claim 1, wherein The cavity is provided with a first through hole and a third slot hole, wherein: The axis of the third slot hole is parallel to the axis of the first stepped hole, opens at the surface of the cavity facing the top cover, and extends to the water outlet and the side of the valve port away from the top cover. The third slot hole communicates the valve port and the water outlet; The first through hole penetrates the cavity between the third slot hole and the first stepped hole and is arranged close to the top cover.

8. The constant flow valve according to claim 1, characterized in that, It further includes a switch module, the switch module includes a housing, a driving unit and a plug arranged in the housing, wherein: The water inlet is communicated with the first channel through a valve hole; The housing is fixed on the valve body and is communicated with the water inlet; The driving unit is connected to the plug and is used to drive the plug to insert and tightly press the valve hole or drive the plug away from the valve hole.

9. The constant flow valve according to claim 8, wherein The driving unit is a solenoid valve.

Images