Pressure reducing valve

Abstract

The utility model relates to a pressure reducing valve which comprises a valve body, a partition piece, a valve element, a diaphragm and a pressure applying assembly. The valve body is provided with a liquid inlet flow channel and a liquid outlet flow channel; the partition piece is arranged in the valve body, an inner side cavity communicated with the liquid inlet flow channel is formed in the partition piece, and a valve seat is arranged at the lower end of the inner side cavity. The valve element penetrates through the inner side cavity, and a valve head is arranged at the lower end of the valve element and extends into the liquid outlet flow channel. The diaphragm is connected to the upper end of the spool; the pressure applying assembly is arranged above the valve element. A detection chamber is defined by the diaphragm and the upper end of the separator, and the separator is further provided with a through hole communicated with the detection chamber and the liquid outlet flow channel; a liquid drainage groove which extends inwards and penetrates in the vertical direction is formed in the outer wall of the circumferential side of the valve head, and the liquid drainage groove is located below the through hole. The liquid drainage groove is formed in the valve head, fluid can be rapidly drained from the liquid drainage groove after passing through the valve seat, turbulent flow generated when the fluid impacts the side wall of the liquid outlet flow channel is reduced, and the situation that the turbulent flow passes through the through hole to affect the pressure in the detection cavity, and then the pressure adjusting function of the pressure reducing valve is affected is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a pressure reducing valve. BACKGROUND

[0002] In the pressure reducing valve, the pressure of the diaphragm received by the liquid will change according to the change of the pressure in the liquid outlet flow channel, and the diaphragm will drive the valve core to move to change the opening degree of the valve seat, and then the pressure in the liquid outlet flow channel will be adjusted by the change of the opening degree of the valve seat, so that the pressure of the liquid after passing through the valve seat will be reduced and stabilized to the required pressure value.

[0003] The pressure fluctuation of the liquid outlet flow channel generally refers to the fluctuation of the fluid pressure caused by the structure of the pump body at the front end of the pressure reducing valve. For example, the pump body of a diaphragm pump or a reciprocating pump, due to its working principle and mechanical movement characteristics, the fluid pressure output by the pump body fluctuates periodically, and the fluid pressure in the pressure reducing valve at the rear end of the pump body also fluctuates periodically, and the diaphragm assembly in the pressure reducing valve makes the output fluid be reduced in pressure and stabilized at the required pressure.

[0004] However, in actual use, due to the internal structure of the pressure reducing valve, the fluid will have abnormal pressure fluctuation due to the internal structure, for example, the fluid in the liquid outlet flow channel of the pressure reducing valve will have serious turbulence due to the internal structure of the pressure reducing valve, which will cause the pressure fluctuation of the liquid outlet flow channel to be more chaotic, and the chaotic pressure fluctuation will cause the diaphragm and the valve core to move abnormally. In this case, the pressure reducing valve is difficult to adjust the pressure of the liquid outlet flow channel normally through the diaphragm and the valve core, and maintain it in a relatively stable range, which greatly affects the function of the pressure reducing valve. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a pressure reducing valve which can reduce the influence of liquid turbulence in the liquid outlet flow channel on the pressure regulating function of the valve body.

[0006] A pressure reducing valve, comprising:

[0007] a valve body provided with a liquid inlet flow channel and a liquid outlet flow channel;

[0008] a partition provided in the valve body, the partition being provided with an inner chamber in communication with the liquid inlet flow channel, and the partition being provided with a valve seat at the lower end of the inner chamber;

[0009] a valve core provided in the inner chamber, the upper end of the valve core being in sealing engagement with the inner chamber, and the lower end of the valve core being provided with a valve head extending out of the inner chamber and into the liquid outlet flow channel, and the opening size between the valve head and the valve seat being changeable by the up-and-down movement of the valve core;

[0010] a diaphragm connected to the upper end of the valve core;

[0011] a pressing assembly arranged above the valve core and configured to apply a force to the valve core to move downward;

[0012] the diaphragm and the upper end of the partition wall define a detection chamber, the partition wall is further provided with a through hole, the through hole communicates the detection chamber and the liquid outlet flow channel, the detection chamber changes with the change of the pressure of the liquid outlet flow channel through the through hole, and the diaphragm will move up and down with the change of the fluid pressure in the detection chamber;

[0013] the outer wall of the valve head is provided with a liquid discharge groove extending inward and penetrating in the up-down direction, and the liquid discharge groove is located below the through hole.

[0014] When the pressure in the liquid outlet flow channel in the bottom end region of the through hole appears abnormal fluctuation such as turbulence, the pressure in the detection chamber will change abnormally, and the movement of the diaphragm and the valve core will be abnormal, and finally the pressure of the liquid outlet flow channel cannot be normally adjusted. Especially after the fluid leaves the valve seat, the fluid flow rate is fast, and when the fluid flows between the channel between the outer wall of the valve core and the side wall of the liquid outlet flow channel, a large amount of fluid will impact on the side wall of the liquid outlet flow channel, and strong turbulence will be generated, thereby affecting the fluid pressure in the bottom end region of the through hole.

[0015] By arranging the above-mentioned liquid discharge groove, part of the fluid can flow along the liquid discharge groove and away from the bottom of the through hole, thereby reducing the impact force of the fluid on the side wall of the liquid outlet flow channel, reducing the turbulence intensity of the fluid impacting on the side wall of the liquid outlet flow channel, thereby reducing the influence on the fluid pressure in the bottom end of the through hole, avoiding abnormal fluctuation of the fluid pressure caused by the structure of the pressure reducing valve, and avoiding the abnormal movement of the diaphragm and the valve core and the final failure of the pressure of the liquid outlet flow channel to be normally adjusted.

[0016] In one embodiment, in the horizontal projection, the minimum distance between the inner wall of the liquid discharge groove and the central axis of the valve core is defined as L1, and the maximum distance between the inner wall of the through hole and the central axis of the valve core is defined as L2, L1 < L2.

[0017] In this way, the fluid directly below the through hole can be discharged through the liquid discharge groove, and at the liquid discharge groove, the flow path of the fluid will be widened to achieve a relatively slow fluid flow speed to ensure that the fluid flow is more stable. Therefore, through the above arrangement, when the through hole is opposite to the liquid discharge groove, the fluid at the bottom end of the through hole will be more stable, and the unstable fluid passing through the through hole will not affect the pressure in the detection chamber.

[0018] In one of the embodiments, the liquid discharge grooves are arranged in multiple and are arranged in intervals along the circumference of the valve head, the valve head forms a protrusion between any two adjacent liquid discharge grooves, the through holes are arranged in multiple and are arranged in intervals along the circumference of the partition, the number of the through holes is different from the number of the protrusions, and when the partition and the valve core are relatively rotated by any angle, at least part of the through holes are arranged opposite to the liquid discharge grooves in the horizontal projection.

[0019] In one of the embodiments, the protrusion is tapered from the end close to the center axis of the valve core to the end away from the center axis of the valve core.

[0020] Therefore, when the fluid flows along the top end of the protrusion, the fluid will gradually flow into the liquid discharge groove, so that the liquid discharge effect of the liquid discharge groove can be better achieved, and less fluid will impact on the side wall of the liquid outlet flow channel, so that the influence of the turbulence caused by the fluid impacting on the side wall of the liquid outlet flow channel on the pressure at the bottom end of the through hole can be reduced.

[0021] The turbulence caused by the fluid flowing along the top end of the protrusion and impacting on the side wall of the liquid outlet flow channel can further reduce the influence of the turbulence on the pressure inside the detection chamber through the through hole.

[0022] In one of the embodiments, the number of the through holes is greater than the number of the protrusions, and the number of the through holes is not an integer multiple of the number of the protrusions.

[0023] Or, the number of the through holes is less than the number of the protrusions, and the number of the protrusions is not an integer multiple of the number of the through holes.

[0024] Through the above arrangement, it can be better ensured that when part of the through holes are arranged opposite to the protrusions on the valve head, part of the through holes are arranged opposite to the liquid discharge grooves, so that all the through holes are not arranged one by one opposite to the protrusions.

[0025] In one of the embodiments, in the horizontal projection, the minimum distance between the inner wall of the liquid discharge groove and the center axis of the valve core is defined as L1, the maximum distance between the outer wall of the protrusion and the center axis of the valve core is defined as L3, a circular ring with the center axis of the valve core as the center, L1 as the inner radius and L3 as the outer radius is defined as the first circular ring, the area of the first circular ring is S, and the total projection area of the protrusion is S1, S1<0.5S.

[0026] In this way, in the horizontal projection, the range occupied by the protrusion is smaller than the range occupied by the liquid discharge groove, so that it is easier to achieve that when the partition and the valve core are relatively rotated by any angle during the installation process, at least part of the through holes are located between two adjacent protrusions in the horizontal projection, and the liquid discharge effect of the liquid discharge groove can be further ensured, so that the pressure at the bottom end of the through hole will not abnormally fluctuate.

[0027] In one of the embodiments, the valve head upper end is provided with a first guide surface, the valve head abuts against the valve seat through the first guide surface, the first guide surface is a taper surface with the upper end smaller and the lower end larger, and the liquid discharge groove penetrates the first guide surface.

[0028] In this way, the first guide surface is arranged to guide the fluid after passing through the valve seat, so as to ensure that the fluid flows more stably after passing through the valve seat, and to ensure that the fluid pressure at the bottom end of the through hole is relatively stable. Meanwhile, the liquid discharge groove penetrates the first guide surface, so that the fluid flows along the first guide surface and enters the liquid discharge groove more stably, thereby reducing the impact force of the fluid on the side wall of the liquid outlet flow channel, and further reducing the influence of the internal structure of the pressure reducing valve on the pressure at the bottom end of the through hole.

[0029] In one of the embodiments, the valve head lower end is provided with a second guide surface, the second guide surface is a taper surface with the upper end larger and the lower end smaller, and the liquid discharge groove penetrates the second guide surface.

[0030] The second guide surface can increase the distance between the valve head lower end and the bottom wall of the liquid outlet flow channel, so as to further quickly discharge the liquid after flowing downward from the liquid discharge groove. Even if the bottom end of the valve head directly abuts against the bottom wall of the liquid outlet flow channel, the second guide surface can still form a flow channel between the bottom end of the valve head and the bottom wall of the liquid outlet flow channel for the fluid to pass through, so as to enable the fluid to flow to the outlet of the liquid outlet flow channel in time after flowing downward from the liquid discharge groove.

[0031] In one of the embodiments, the partition includes an annular portion and a cylindrical portion, the cylindrical portion is arranged inside the annular portion and extends downward, the inside of the cylindrical portion forms the inside chamber, the outside of the cylindrical portion, the lower end of the annular portion and the inner wall of the valve body form an outside chamber, the outside chamber is communicated with the liquid inlet flow channel, the cylindrical portion is provided with a plurality of through grooves extending along the radial direction thereof, the through grooves communicate the outside chamber and the inside chamber, and the through holes are arranged in plurality, the plurality of through holes are arranged in interval along the circumferential direction of the cylindrical portion, and any one of the through holes is arranged between two adjacent through grooves.

[0032] This embodiment, by setting multiple through slots, makes the fluid distribution within the separator more uniform, thus making the liquid flow from the inner chamber to the outlet channel more stable. Furthermore, because there are multiple through holes, the fluid pressure inside the detection chamber can be affected by multiple through holes. This ensures that even if the pressure at the bottom of one through hole is abnormal, the impact on the overall detection chamber is relatively small, guaranteeing the normal functioning of the pressure reducing valve. Preferably, there are three or more through holes. These through holes are arranged at intervals along the circumference of the cylinder, with any one through hole located between two adjacent through slots. This arrangement ensures that the through holes avoid the through slot portion. It prevents the fluid velocity at the bottom of the through slot from being higher after passing through the valve seat, which could lead to fluid pressure instability and abnormal pressure at the bottom of the through hole. This allows the detection chamber to more accurately reflect pressure changes in the outlet channel, enabling the diaphragm to make timely adjustments.

[0033] In one embodiment, the distance between any through hole and the two through slots located on both sides of the through hole is equal.

[0034] Since the fluid velocity is relatively high and the flow is relatively unstable near the through-slot, the above-mentioned design further avoids the lower end of the through hole being in a region with relatively high flow velocity, thereby improving the stability of fluid flow.

[0035] In one embodiment, the upper end of the separator is provided with an adjustment groove, the adjustment groove and the diaphragm surround the detection chamber, the bottom wall of the adjustment groove is provided with an inclined surface, the lowest point of the inclined surface is provided with an annular protrusion, a portion of the upper end of the through hole passes through the annular protrusion, and another portion passes through the lowest point of the bottom wall of the adjustment groove.

[0036] The above configuration can prevent the diaphragm from blocking the top of the through hole, and the inclined surface can facilitate the discharge of impurities or crystals between the separator and the diaphragm to the top of the through hole, and finally discharge them through the through hole. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a cross-sectional view of the pressure reducing valve in this application;

[0039] Figure 2This is a perspective view of the assembly structure of the separator and valve core in this application;

[0040] Figure 3 for Figure 2 A cross-sectional view of the structure shown;

[0041] Figure 4 for Figure 3 A bottom view of the structure shown;

[0042] Figure 5 This is a bottom view of the partition in this application;

[0043] Figure 6 This is a schematic diagram of the horizontal projection of the valve head in this application;

[0044] Figure 7 This is a cross-sectional view of the assembly structure of the separator and valve core in this application.

[0045] Reference numerals: 10, valve body; 101, inlet channel; 102, outlet channel; 20, separator; 201, inner chamber; 202, detection chamber; 203, through hole; 204, outer chamber; 205, through groove; 206, adjusting groove; 2061, inclined surface; 2062, annular protrusion; 21, annular part; 22, cylindrical part; 23, valve seat; 30, valve core; 31, valve head; 311, drain groove; 312, protrusion; 313, first guide surface; 314, second guide surface; 40, diaphragm; 50, pressure application assembly; 60, cover; 601, cavity. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0048] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, a feature defined with "first", "second" can explicitly or implicitly comprise at least one such feature. In the description of the present application, the meaning of "a plurality of" is at least two, for example two, three, etc., unless otherwise explicitly and specifically limited.

[0049] In the present application, unless otherwise explicitly specified and limited, the "on", "under" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "over", "above" and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0050] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0051] Please refer to Figures 1 to 3 The present application provides a pressure reducing valve, which comprises a valve body 10, a partition 20, a valve core 30, a diaphragm 40 and a pressure applying assembly 50. The valve body 10 is provided with an inlet flow channel 101 and an outlet flow channel 102; the partition 20 is arranged in the valve body 10, and the partition 20 is provided with an inner chamber 201 in communication with the inlet flow channel 101, and the partition 20 is provided with a valve seat 23 at the lower end of the inner chamber 201; the valve core 30 is arranged in the inner chamber 201, and the upper end of the valve core 30 is in sealing cooperation with the inner chamber 201, and the lower end of the valve core 30 is provided with a valve head 31 which extends out of the inner chamber 201 and into the outlet flow channel 102, and the up-and-down movement of the valve core 30 can change the opening size between the valve head 31 and the valve seat 23. The diaphragm 40 is connected to the upper end of the valve core 30; and the pressure applying assembly 50 is arranged above the valve core 30 and is used for applying a downward moving force to the valve core 30.

[0052] The diaphragm 40 and the upper end of the partition 20 surround a detection chamber 202, and the partition 20 is further provided with a through hole 203 which is in communication with the detection chamber 202 and the outlet flow channel 102, and the detection chamber 202 realizes the change of pressure by the change of pressure of the outlet flow channel 102 through the through hole 203, and the diaphragm 40 will drive the valve core 30 to move up and down with the change of fluid pressure in the detection chamber 202.

[0053] In order to facilitate the installation of the pressure applying assembly 50, the pressure reducing valve further comprises a cover 60 connected with the valve body 10, the cover 60 and the diaphragm 40 surround a cavity 601, and the pressure applying assembly 50 is arranged in the cavity 601. The cover 60 and the valve body 10 can cooperate to protect the internal structure. In an embodiment, the pressure applying assembly 50 is an elastic assembly, which abuts between the cover 60 and the valve core 30. The installation mode of the pressure applying assembly 50 is not limited thereto, as long as the pressure applying assembly 50 and the pressure in the detection chamber 202 jointly act to control the up-and-down movement of the valve core 30.

[0054] When the fluid enters the valve body from the inlet flow channel 101, and then passes through the inner chamber 201 and the valve seat 23 to enter the outlet flow channel 102, there will be a pressure loss when the fluid passes through the valve seat 23, that is, the pressure of the fluid can be reduced by the pressure reducing valve, so that the fluid can flow out of the outlet flow channel 102 and then enter the pipeline system at the rear end after the pressure is reduced. Thus, the damage of the pipeline system at the rear end caused by excessive fluid pressure can be avoided. When the fluid pressure in the outlet flow channel 102 fluctuates, the fluid pressure in the detection chamber 202 will change with the pressure in the outlet flow channel 102 due to the through hole 203, and the diaphragm 40 and the valve core 30 will move up and down, so as to adjust the opening of the valve seat 23, so that the fluid pressure in the outlet flow channel 102 can be stabilized within the required range.

[0055] Specifically, when the pressure in the outlet flow channel 102 is at the required pressure, the upward fluid pressure on the diaphragm 40 and the downward pressure on the valve core 30 are equal at this time, and the diaphragm 40 and the valve core 30 will not move up and down; when the fluid pressure in the outlet flow channel 102 decreases, the fluid pressure in the detection chamber 202 decreases, at this time, the downward force of the pressure applying assembly 50 on the valve core 30 is greater than the upward force of the fluid in the detection chamber 202 on the diaphragm 40, the pressure applying assembly 50 will push the valve core 30 to move downward, so as to increase the opening between the valve head 31 and the valve seat 23, thereby increasing the fluid pressure in the outlet flow channel 102. Conversely, the same is true. Ultimately, the fluid pressure in the outlet flow channel 102 is stabilized within a predetermined pressure range, and the fluid pressure in the outlet flow channel 102 will not fluctuate sharply due to the fluctuation of the pipeline pressure.

[0056] Of course, it can be understood that the pressure of the pressure applying assembly 50 on the valve core 30 can also be adjustable, so that the fluid pressure in the outlet flow channel 102 can be of different sizes when the diaphragm and the valve core are in force balance; similarly, the pressure applying assembly 50 can also be a gas cavity structure in other embodiments, so as to pressurize the diaphragm 40 and the valve core 30 by gas pressure.

[0057] Due to the communication between the through hole 203 and the detection chamber 202 and the liquid outlet channel 102, the pressure fluctuation in the liquid outlet channel 102 will affect the pressure in the detection chamber 202. Specifically, the pressure in the liquid outlet channel 102 at the bottom end of the through hole 203 will affect the pressure in the detection chamber 202 through the through hole 203. When the pressure in the liquid outlet channel 102 at the bottom end of the through hole 203 fluctuates abnormally, the pressure in the detection chamber 202 will change abnormally, and the movement of the diaphragm 40 and the valve core 30 will be abnormal, and finally the pressure in the liquid outlet channel 102 cannot be normally regulated. Especially when the fluid flows away from the valve seat 23, the fluid flow is fast, and when the fluid flows between the channel between the outer wall of the valve core 30 and the side wall of the liquid outlet channel 102, a large amount of fluid will impact on the side wall of the liquid outlet channel 102, and strong turbulence will be generated, thereby affecting the fluid pressure at the bottom end of the through hole 203.

[0058] Further, the valve head 31 is provided with a liquid discharge groove 311 extending inwardly and vertically. The liquid discharge groove 311 is located below the through hole 203. Through the liquid discharge groove 311, part of the fluid can flow along the liquid discharge groove 311 and away from the bottom of the through hole 203, thereby reducing the impact force of the fluid on the side wall of the liquid outlet channel 102 and reducing the turbulence intensity of the fluid impacting on the side wall of the liquid outlet channel 102, thereby reducing the influence on the fluid pressure at the bottom end of the through hole 203, avoiding abnormal fluctuation of the fluid pressure caused by the structure of the pressure reducing valve, and thereby avoiding the abnormal movement of the diaphragm 40 and the valve core 30 and finally causing the pressure in the liquid outlet channel 102 to be normally regulated.

[0059] Please refer to Figure 3 In the horizontal projection, the minimum distance between the inner wall of the liquid discharge groove 311 and the central axis of the valve core 30 is defined as L1, and the maximum distance between the inner wall of the through hole 203 and the central axis of the valve core 30 is defined as L2, L1

[0060] Further, in the horizontal projection, the distance between the central axis of the through hole 203 and the central axis of the valve core 30 is defined as L4, L1

[0061] Please refer to Figure 2 and Figure 4 Further, the liquid discharge grooves 311 are arranged in multiple numbers and are arranged at intervals along the circumference of the valve head 31, and the valve head 31 forms a protrusion 312 between any two adjacent liquid discharge grooves 311, so that the number of the liquid discharge grooves 311 is the same as the number of the protrusions 312. The through holes 203 are arranged in multiple numbers and are arranged at intervals along the circumference of the partition 20, and the number of the through holes 203 is not the same as the number of the protrusions 312. When the partition 20 and the valve core 30 are relatively rotated by any angle, in the horizontal projection, at least part of the through holes 203 are arranged opposite to the liquid discharge grooves 311. Through the above arrangement of the protrusions 312 and the liquid discharge grooves 311, the fluid passing through the valve seat 23 can be dispersed and discharged, so as to ensure the stability of the fluid flow. Since at the position of the protrusion 312, the fluid will flow along the top end of the protrusion 312 and impact on the side wall of the liquid outlet flow channel 102, if the protrusion 312 is arranged opposite to the through hole 203, the influence of the fluid pressure on the bottom end of the through hole 203 is greater than that when the protrusion 312 is not arranged opposite to the through hole 203, and the arrangement that at least part of the through holes 203 correspond to the liquid discharge grooves 311 can avoid that all the through holes 203 are arranged opposite to the protrusions 312 one by one, so as to realize that the pressure in the final detection chamber 202 is less affected by the abnormal fluid fluctuation in the valve body, and to ensure that the pressure relief valve can better stabilize the fluid pressure through the cooperation of the diaphragm 40, the valve core 30 and the valve seat 23, so as to realize that the fluid pressure output by the pressure relief valve can be well maintained stable.

[0062] In an embodiment, the number of the through holes 203 is greater than the number of the protrusions 312, and the number of the through holes 203 is not an integer multiple of the number of the protrusions 312. It can be understood that when the valve core 30 and the partition 20 are installed, the valve core 30 can be rotated relative to the partition 20, so that the relative position of the valve core 30 and the partition 20 in the circumference is random. When the valve core 30 is rotated to different positions relative to the partition 20, the through holes 203 can be arranged opposite to the protrusions 312 on the valve head 31, or can be arranged opposite to the liquid discharge grooves 311 on the valve head 31. Through the arrangement that the number of the through holes 203 is not an integer multiple of the number of the protrusions 312, it can be better ensured that when part of the through holes 203 are arranged opposite to the protrusions 312 on the valve head 31, part of the through holes 203 are arranged opposite to the liquid discharge grooves 311, so as to avoid that all the through holes 203 are arranged opposite to the protrusions 312 one by one.

[0063] In another embodiment, the number of through holes 203 is less than the number of protrusions 312, and the number of protrusions 312 is not an integer multiple of the number of through holes 203. This embodiment can also achieve that when the partial through hole 203 and the protrusion 312 on the valve head 31 are oppositely arranged, there is a partial through hole 203 and a drainage groove 311 oppositely arranged, thereby avoiding that all through holes 203 are oppositely arranged with the protrusions 312. Please refer to Figure 4 and Figure 5 , schematically, in an embodiment, the number of through holes 203 is 4, and the number of protrusions 312 is 6. When the valve core 30 is oppositely rotated to any position relative to the partition 20, there are at least 2 through holes 203 and drainage grooves 311 oppositely arranged.

[0064] As shown in Figure 6 , in the horizontal projection, the maximum distance between the outer wall of the protrusion 312 and the central axis of the valve core 30 is defined as L3, and a circular ring with the central axis of the valve core 30 as the center, L1 as the inner radius, and L3 as the outer radius is defined as the first circular ring. The area of the first circular ring is S, and the total projection area of the protrusion 312 is S1, S1 < 0.5S. In this way, in the horizontal projection, the range occupied by the protrusion 312 is smaller than the range occupied by the drainage groove 311, which makes it easier to achieve that when the partition 20 and the valve core 30 are oppositely rotated to any angle during installation, at least part of the through hole 203 is located between two adjacent protrusions 312 in the horizontal projection, and further ensures the drainage effect of the drainage groove 311 to ensure that the pressure at the bottom end of the through hole 203 does not abnormally fluctuate.

[0065] Please refer to Figure 2 and Figure 4 , further, the drainage groove 311 expands from the end close to the central axis of the valve core 30 to the end away from the central axis of the valve core 30, and correspondingly, the protrusion 312 shrinks from the end close to the central axis of the valve core 30 to the end away from the central axis of the valve core 30. A part of the fluid flowing through the valve seat 23 directly enters the drainage groove 311 and is drained through the drainage groove 311, and another part flows along the top wall of the protrusion 312 and gradually flows down along the side wall of the protrusion 312. Therefore, the above arrangement makes the fluid flowing out of the valve seat 23 more enter the drainage groove 311, so that fewer fluids will hit the side wall of the liquid outlet flow channel 102, thereby facilitating to improve the stability of fluid flow.

[0066] Further, the outer wall surface of the protrusion 312 is a semicylindrical curved surface, the bottom wall of the drainage groove 311 is a circular arc curved surface, and the connecting surface between the outer wall surface of the protrusion 312 and the bottom wall of the drainage groove 311 is a circular arc curved surface. When the fluid flows through these curved surfaces, the fluid can flow more smoothly through the influence of wall surface effect and the like, and the turbulence is reduced to avoid that the strong turbulence affects the pressure of the through hole 203.

[0067] Please refer to Figure 2 and Figure 3 Further, the valve head 31 is provided with a first guide surface 313 at the upper end, and the valve head 31 abuts against the valve seat 23 through the first guide surface 313. The first guide surface 313 is a tapered surface with a small upper end and a large lower end, and the liquid discharge groove 311 penetrates the first guide surface 313. In this way, the first guide surface 313 is arranged to guide the flow of fluid, so that the fluid will flow relatively smoothly downward along the first guide surface 313 and away from the bottom end of the penetration hole 203, until the fluid collides with the side wall of the liquid outlet flow channel 102 and becomes turbulent. In the above structure, the arrangement of the first guide surface 313 will make the fluid at the bottom end of the penetration hole 203 relatively stable, and even if the fluid collides with the liquid outlet flow channel 102 and becomes severely turbulent, the distance between the turbulent area and the penetration hole 203 is relatively far, and the influence on the fluid pressure at the bottom end of the penetration hole 203 is small. Thus, it can effectively avoid or reduce the influence of the turbulent flow caused by the internal structure of the valve body on the fluid pressure at the bottom end of the penetration hole 203, thereby avoiding the turbulent flow causing the fluid pressure in the detection chamber 202 to be abnormal, or reducing the influence of the abnormal pressure in the detection chamber 202, and further avoiding the abnormal movement of the diaphragm 40 and the valve core 30 causing the opening of the valve seat 23 to be abnormal, and ultimately causing the pressure regulating function of the pressure reducing valve to be abnormal.

[0068] Further, the valve head 31 is provided with a second guide surface 314 at the lower end, and the second guide surface 314 is a tapered surface with a large upper end and a small lower end, and the liquid discharge groove 311 penetrates the second guide surface 314. The second guide surface 314 can increase the distance between the lower end of the valve head 31 and the bottom wall of the liquid outlet flow channel 102, so that after the fluid flows downward from the liquid discharge groove 311, it can be further quickly discharged. At the same time, even when the lower end of the valve head 31 directly abuts against the liquid outlet flow channel 102, under the action of the second guide surface 214, there is still enough space between the lower end of the valve head 31 and the liquid outlet flow channel 102, so that the fluid can be smoothly discharged.

[0069] Please refer to Figure 1 , Figure 2 and Figure 7The partition 20 comprises an annular portion 21 and a cylindrical portion 22, the cylindrical portion 22 is arranged inside the annular portion 21 and extends downward, the inside of the cylindrical portion 22 forms an inside chamber 201, and a valve seat 23 is formed at the lower end of the cylindrical portion 22. The outside of the cylindrical portion 22, the lower end of the annular portion 21 and the inner wall of the valve body 10 form an outside chamber 204, the outside chamber 204 is communicated with the liquid inlet channel 101, the cylindrical portion 22 is provided with a plurality of through grooves 205 extending along the radial direction of the cylindrical portion 22, the through grooves 205 communicate the outside chamber 204 and the inside chamber 201. The through holes 203 are arranged in multiple, and the multiple through holes 203 are arranged at intervals along the circumferential direction of the cylindrical portion 22, and any one of the through holes 203 is arranged between two adjacent through grooves 205. In this way, the fluid in the liquid inlet channel 101 first enters the outside chamber 204, then enters the inside chamber 201 through the through grooves 205, and finally is discharged to the liquid outlet channel 102 through the valve seat 23.

[0070] In the embodiment, the multiple through grooves 205 are arranged to make the fluid in the partition 20 more evenly distributed, so that the liquid flowing from the inside chamber 201 to the liquid outlet channel 102 is more stable. In addition, since the multiple through holes 203 are arranged, the fluid pressure in the detection chamber 202 can be affected through the multiple through holes 203, so that even if the pressure at the bottom of one of the through holes 203 is abnormal, the influence on the whole detection chamber 202 is relatively small, so as to ensure that the function of the pressure reducing valve can be normally used, and the number of the through holes 203 is preferably 3 or more; the multiple through holes 203 are arranged at intervals along the circumferential direction of the cylindrical portion 22, and any one of the through holes 203 is arranged between two adjacent through grooves 205, so that the detection chamber 202 can more accurately reflect the pressure change of the liquid outlet channel 102, so that the diaphragm 40 can be adjusted in time.

[0071] Further, the distance between any one of the through holes 203 and the two through grooves 205 located on both sides of the through hole 203 is equal. Since the flow rate of the fluid near the through grooves 205 is relatively large and the flow is relatively unstable, through the above arrangement, the lower end of the through hole 203 is avoided to be located in the area with relatively large flow rate, so as to ensure that the flow rate of the fluid at the bottom of the through hole 203 is not too large, so as to ensure that the fluid pressure at the bottom of the through hole 203 is relatively stable, and to avoid or reduce the turbulence caused by the too large flow rate of the fluid to cause the abnormal pressure at the bottom of the through hole 203.

[0072] Please refer to Figure 1 and Figure 3The upper end of the partition 20 is provided with an adjusting groove 206, the adjusting groove 206 and the diaphragm 40 surround a detection chamber 202, the bottom wall of the adjusting groove 206 is provided with an inclined surface 2061, the lowest part of the inclined surface 2061 is provided with an annular protrusion 2062, a part of the upper end of the through hole 203 penetrates the annular protrusion 2062, and another part penetrates the lowest part of the bottom wall of the adjusting groove 206. Through the above setting, the diaphragm 40 can avoid plugging the top end of the through hole 203, and the inclined surface 2061 can realize that when there are some impurities or crystals between the partition 20 and the diaphragm 40, the impurities or crystals can also be conveniently discharged through the inclined surface 2061 to the upper end of the through hole 203, and finally discharged through the through hole 203.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0074] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A pressure reducing valve, comprising: The valve body is equipped with an inlet flow channel and an outlet flow channel; A separator is provided in the valve body, the separator has an inner chamber that communicates with the liquid inlet channel, and the separator has a valve seat at the lower end of the inner chamber; A valve core is inserted into the inner chamber. The upper end of the valve core is sealed to the inner chamber. A valve head is provided at the lower end of the valve core. The valve head extends out of the inner chamber and into the liquid outlet channel. The valve core can change the size of the opening between the valve head and the valve seat by moving up and down. A diaphragm is connected to the upper end of the valve core; A pressure-applying component is disposed above the valve core and is used to apply a downward force to the valve core; Its features are, The diaphragm and the upper end of the separator form a detection chamber. The separator is also provided with a through hole, which connects the detection chamber and the liquid outlet channel. The pressure in the detection chamber changes with the pressure in the liquid outlet channel through the through hole. The diaphragm will drive the valve core to move up and down as the fluid pressure in the detection chamber changes. The outer wall of the valve head is provided with an inwardly extending drainage groove that runs through the vertical direction, and the drainage groove is located below the through hole.

2. The pressure reducing valve according to claim 1, characterized in that, In the horizontal projection, the minimum distance between the inner wall of the drain trough and the central axis of the valve core is defined as L1, and the maximum distance between the inner wall of the through hole and the central axis of the valve core is defined as L2, where L1 < L2.

3. The pressure reducing valve according to claim 1, characterized in that, The drain channels are configured in multiple ways and arranged at intervals along the circumference of the valve head. The valve head forms a protrusion between any two adjacent drain channels. The through holes are provided in multiples and are arranged at intervals along the circumference of the separator. The number of through holes is different from the number of protrusions. When the separator and the valve core are rotated relative to each other at any angle, at least some of the through holes are arranged opposite to the drain groove in the horizontal projection.

4. The pressure reducing valve according to claim 3, characterized in that, The number of through holes is greater than the number of protrusions, and the number of through holes is not an integer multiple of the number of protrusions; Alternatively, the number of through holes is less than the number of protrusions, and the number of protrusions is not an integer multiple of the number of through holes.

5. The pressure reducing valve according to claim 3, characterized in that, In the horizontal projection, the minimum distance between the inner wall of the drain trough and the central axis of the valve core is defined as L1, the maximum distance between the outer wall of the protrusion and the central axis of the valve core is defined as L3, and the annulus with the central axis of the valve core as the center, L1 as the inner radius and L3 as the outer radius is defined as the first annulus, the area of ​​the first annulus is S, and the total projected area of ​​the protrusion is S1, where S1 < 0.5S.

6. The pressure reducing valve according to claim 3, characterized in that, The protrusion tapers from one end near the central axis of the valve core to the end away from the central axis of the valve core.

7. The pressure reducing valve according to claim 1, characterized in that, The valve head has a first guide surface at its upper end, and the valve head abuts against the valve seat through the first guide surface. The first guide surface is a conical surface that is smaller at the top and larger at the bottom, and the drain groove passes through the first guide surface.

8. The pressure reducing valve according to claim 1, characterized in that, The lower end of the valve head is provided with a second guide surface, which is a conical surface that is larger at the top and smaller at the bottom, and the drain groove passes through the second guide surface.

9. The pressure reducing valve according to claim 1, characterized in that, The separator includes an annular portion and a cylindrical portion. The cylindrical portion is disposed inside the annular portion and extends downward. The inner side of the cylindrical portion forms the inner chamber. The outer side of the cylindrical portion, the lower end of the annular portion, and the inner wall of the valve body form an outer chamber. The outer chamber communicates with the liquid inlet channel. The cylindrical portion has multiple through slots extending radially, which connect the outer chamber and the inner chamber. The through holes are provided in multiple ways, and the multiple through holes are arranged at intervals along the circumference of the cylinder. Any one of the through holes is located between two adjacent through slots.

10. The pressure reducing valve according to claim 1, characterized in that, The upper end of the separator is provided with an adjustment groove, the adjustment groove and the diaphragm surround the detection chamber, the bottom wall of the adjustment groove is provided with an inclined surface, the lowest point of the inclined surface is provided with an annular protrusion, a part of the upper end of the through hole passes through the annular protrusion, and another part passes through the lowest point of the bottom wall of the adjustment groove.

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