Pressure stabilizing valve

Abstract

The utility model discloses a pressure maintaining valve, belongs to the field of pressure maintaining valves, solves the problem that a valve core vibrates due to the fact that fluid impacts the valve core, and adopts the technical scheme that the pressure maintaining valve comprises a valve main body, the valve core and an operating part, and a first valve cavity, a second valve cavity and a communicating flow path are formed in the valve main body; the first valve cavity and the second valve cavity are communicated through a communication flow path, the valve element is movably arranged in the valve body and penetrates through the middle of the middle valve body, a first diaphragm and a second diaphragm are arranged at the two ends of the valve element respectively, and a buffering cavity is formed between the inlet flow channel and the first valve cavity. The buffer cavity comprises a liquid separation section directly facing the inlet flow channel and an extension section located on the side face of the liquid separation section, and the liquid separation section and the extension section are arranged in a communicating mode; and liquid in the inlet flow channel flows through the buffer cavity and then enters the first valve cavity. The buffer valve is mainly used for the buffer cavity and can play a role in buffering fluid, so that the fluid is more stable, and the vibration amplitude of the valve core is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure-stabilizing valves, in particular to a pressure-stabilizing valve. Background Art

[0002] A pressure-stabilizing valve is a valve used to stabilize the output pressure. When the pressure of the inlet flow channel is constantly changing, the pressure of the outlet flow channel is kept stable at the set pressure. In the prior art, the pressure-stabilizing valve includes a valve body and a valve core movably arranged in the valve body. The valve body is provided with a first valve cavity, a second valve cavity and a connecting flow path. The first valve cavity and the second valve cavity are connected through the connecting flow path. The two sides of the valve body are provided with an inlet flow channel and an outlet flow channel. The inlet flow channel is connected to the first valve cavity, and the outlet flow channel is connected to the second valve cavity. When in use, when the pressure of the liquid in the second valve cavity deviates from the set pressure, the pressure of the liquid in the second valve cavity acting on the valve core changes, and then the resultant force in the axial direction of the valve core changes, so that the valve core moves axially and changes the opening size between the valve seat. The pressure drop between the first valve cavity and the second valve cavity is changed by different opening sizes, and the pressure inside the second valve cavity tends to the set pressure.

[0003] When the pressure-stabilizing valve is in use, it is expected that the movement of the valve core is only due to the change in the liquid pressure in the second valve chamber. However, during actual use, the high flow rate of the fluid entering the first valve chamber will also cause the valve core to vibrate. At the same time, the fluid flows directly into the first valve chamber from the inlet flow channel and will have an impact on the valve core, causing the area of ​​the valve core close to the flow channel to be significantly impacted more than the rest of the area, resulting in uneven force on the valve core, making it easy for the valve core to swing and vibrate, and causing the opening area between the valve core and the valve seat to change continuously, thereby affecting the overall performance of the pressure-stabilizing valve. Utility Model Content

[0004] The utility model aims to solve the problem that the fluid may impact the valve core and cause the valve core to vibrate. For this purpose, a pressure-stabilizing valve is provided, in which the buffer chamber can buffer the fluid, making the fluid more stable and ensuring that the valve core is not prone to swinging and vibrating.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A pressure stabilizing valve, comprising:

[0007] A valve body, wherein a first valve cavity, a second valve cavity and a communication flow path are formed inside, and the first valve cavity is connected with the second valve cavity through the communication flow path;

[0008] The valve core is disposed inside the valve body and includes a first diaphragm formed inside the first valve cavity and a second diaphragm formed inside the second valve cavity;

[0009] An operating part acts on the valve core and applies a force to the valve core toward the first valve cavity;

[0010] A valve seat is formed on the communication flow path, and the valve core changes the opening and closing degree between the valve core and the valve seat in response to the pressure change of the fluid in the second valve chamber;

[0011] An inlet flow channel communicated with the first valve chamber;

[0012] An outlet flow channel communicated with the second valve chamber;

[0013] A buffer chamber is provided between the inlet flow channel and the first valve chamber, the buffer chamber comprising a liquid separation section facing the inlet flow channel and an extension section located on the side of the liquid separation section, the liquid separation section and the extension section are connected;

[0014] The liquid in the inlet flow channel flows through the buffer cavity and then enters the first valve cavity.

[0015] The beneficial effects of adopting the utility model are:

[0016] In the utility model, the fluid will first pass through the buffer chamber before entering the first valve chamber. The buffer chamber can play a buffering role on the fluid, slow down the flow rate of the fluid entering the first valve chamber, so that the fluid can flow into the first valve chamber smoothly, reduce the influence of the fluid on the valve core, reduce the vibration amplitude of the valve core, make the movement of the valve core more stable, and also can reduce the noise generated when the valve core moves, which is beneficial to improve the running stability of the pressure-stabilizing valve, and also can improve the working environment of the pressure-stabilizing valve; in addition, the buffer chamber includes a liquid separation section and an extension section, and part of the fluid will be guided to the extension section after entering the liquid separation section. The liquid separation section and the extension section can make the fluid expand and disperse in the buffer chamber, and then when the liquid enters the first valve chamber through the liquid separation section and the extension section, the liquid can enter in a dispersed manner to avoid the liquid from being concentrated on one side to enter the first valve chamber, so as to avoid the valve core from being subjected to the impact force of the liquid on one side, causing the valve core to swing and vibrate, slow down the flow rate of the fluid, so that the fluid can enter the first valve chamber more smoothly, reduce the impact of the fluid on the valve core, and make the movement of the valve core more stable.

[0017] Preferably, the inner side wall of the liquid separation section is arranged opposite to the inlet flow channel, and on the projection plane perpendicular to the axis of the inlet flow channel, more than 80% of the projection area of ​​the inlet flow channel overlaps with the projection area of ​​the inner side wall of the liquid separation section. By adopting the above-mentioned technical solution, most of the projection of the inlet flow channel in the axial direction overlaps with the inner side wall of the buffer cavity, which can ensure that the liquid in the inlet flow channel can hit the side wall of the buffer cavity when flowing into the buffer cavity, and form a turbulent area, which forms a static pressure area. After the liquid passes through the static pressure area, it can enter the first valve cavity more stably, avoiding the instability of the liquid entering the first valve cavity, resulting in the vibration of the valve core, etc.

[0018] Preferably, the extension section is an arc-shaped channel surrounding the connecting flow path. With the above technical solution, the arc-shaped channel can better fit the flow of the fluid, making the flow of the fluid in the extension section smoother, so that the fluid can smoothly fill the extension section, which helps the fluid to expand in the buffer cavity, slow down the flow rate of the fluid, and allow the fluid to enter the first valve cavity more smoothly.

[0019] Preferably, the liquid separation section is provided with extension sections on both sides of the inlet flow channel, so that the buffer chamber is symmetrically arranged with respect to the inlet flow channel. With the above technical solution, the buffer chamber is symmetrically arranged with respect to the inlet flow channel, so that the fluid can be evenly distributed to the two extension sections, and when the fluid finally enters the first valve chamber, the liquid distribution will be more even, so as to avoid the liquid being concentrated on one side of the valve core, causing the valve core to be subjected to a significantly greater impact force of the liquid on one side of the valve core, causing the valve core to be easily tilted or swung.

[0020] Preferably, the angle between the end points of the extension sections on both sides away from the liquid separation section and the line connecting the center of the first valve cavity is θ, where θ≥60°. During the flow process, the liquid will first fill the buffer cavity, and then enter the first valve cavity from the buffer cavity. In this case, θ≥60° can ensure that the distribution area of ​​the liquid when entering the first valve cavity is larger. At this time, after the liquid enters the first valve cavity, it continues to diffuse and flow in the first valve cavity, and when it finally contacts the side of the valve core, the flow velocity distribution difference of the fluid in each area on the annular side of the entire side of the valve core is smaller, thereby ensuring that the valve core is less affected by the impact force of the liquid in the first valve cavity, so as to ensure that the performance of the valve body is more stable.

[0021] Preferably, the side of the buffer chamber close to the inlet flow channel is an outer wall, and the outer wall of the buffer chamber is arranged on the same wall as the outer wall of the first valve chamber. The above-mentioned technical solution can reduce unnecessary wall structure and space occupation, make the internal structure of the valve body more compact, reduce the overall volume of the valve body, and facilitate the transportation and storage of the valve body; in addition, the common wall structure can reduce the connection points, make the outer wall of the buffer chamber smoother, reduce the existence of dead angles, and also help reduce the turbulence of the liquid in the first valve chamber, thereby avoiding the valve core vibration caused by the turbulence of the liquid inside the first valve chamber.

[0022] Preferably, the first diaphragm includes an outer fixed part, a deformable part and an inner fixed part, and a support wall is provided in the valve body to support the bottom end of the outer fixed part, and the inner side wall of the buffer cavity virtually extends downward to intersect with the top surface of the outer fixed part. The above-mentioned technical solution can effectively prevent the fluid from directly impacting the deformable part or the inner fixed part after leaving the buffer cavity, thereby causing the valve core to vibrate. Since the bottom end of the outer fixed part is supported by the valve body, even if the liquid directly impacts the outer fixed part, the impact force will not cause the valve core to move up and down or vibrate, thereby effectively preventing the impact force of the liquid from affecting the valve core when the liquid enters the first valve cavity.

[0023] Preferably, the inner side wall of the buffer cavity is virtually extended downward and is perpendicular to the top surface of the outer fixed part. By adopting the above-mentioned technical solution, the inner side wall of the buffer cavity guides the fluid to flow vertically to the outer fixed part, further reducing the impact force of the fluid on the deformation part and the inner fixed part, reducing the possibility of the valve core vibrating, and improving the stability of the valve core. At the same time, this structural setting can ensure that the position of the outer fixed part impacted by the liquid is relatively far away from the deformation part, and the turbulence caused by the liquid hitting the outer fixed part has little effect on the inner fixed part and the deformation part, thereby further avoiding the vibration of the deformation part and the inner fixed part; moreover, in this case, the liquid is in the relatively outer area of ​​the first valve cavity, so when the liquid flows inward from this area to the deformation part and the inner fixed part, it can ensure that the liquid is more dispersed, so as to avoid the liquid flow on the side of the valve core close to the inlet flow channel being significantly larger than the flow in the other areas, resulting in uneven force on the valve core, and then causing the valve core to swing, vibrate, etc.

[0024] Preferably, the first valve cavity includes a flow expansion portion and a liquid outlet portion located inside the flow expansion portion, the flow expansion portion is located on the upper side of the external fixed portion and is connected to the buffer cavity, and the liquid outlet portion is located inside the external fixed portion and is connected to the connecting flow path; wherein, the flow expansion portion is an annular structure with equal ring width at each location. When the liquid inside the buffer cavity enters the first valve cavity, it will first enter the flow expansion portion, and in the process of flowing to the inside of the first valve cavity, the liquid will gradually diffuse and disperse, and because the flow expansion portion is an annular structure, it is ensured that the liquid will be dispersed in the entire annular area, so that when the liquid finally contacts the side of the valve core, the flow velocity of the liquid at each axial location on the side of the valve core is relatively uniform, so that the impact force of the liquid at each location on the side of the valve core will not be too different, thereby ensuring the stability of the valve core performance, and the valve core will not experience severe vibration, swing, etc. due to the impact of the liquid inside the first valve cavity on the valve core.

[0025] Preferably, a support member is provided inside the first valve cavity, and the support member is provided between the top wall of the first valve cavity and the external fixed portion, and limits the movement of the external fixed portion in the direction of the connecting flow path. The aforementioned diffusion portion will make the area of ​​the external fixed portion larger. When the external fixed portion moves in the direction of the connecting flow path, its bottom will be partially suspended. At this time, the force exerted by the liquid on the external fixed portion will greatly affect the force balance of the valve core. The movement of the external fixed portion can be limited by the support member, thereby preventing the bottom end of the external fixed portion from being suspended, and further preventing the pressure exerted by the liquid on the external fixed portion from affecting the force balance of the valve core, so as to ensure that the movement of the valve core is only affected by the fluctuation of the liquid pressure inside the second valve cavity as much as possible, thereby ensuring that the valve body has good performance.

[0026] Preferably, the top wall of the buffer chamber is provided with an upwardly concave curved surface, the distance between the lowest end of the curved surface and the top wall of the inlet flow channel is H1, and the radius of the inlet flow channel is R, wherein H1≥R / 2. With the aforementioned technical solution, the concave curved surface can guide the fluid to flow to the lower side of the buffer chamber, can reduce the turbulence and eddy current that may be generated when the fluid changes its flow direction, and provide smoothness of fluid flow; in addition, H1≥R / 2 can reduce the structural dead angle at the upper end of the buffer chamber and reduce the possibility of sediment accumulation in the buffer chamber; and when H1<R / 2, the overall area of ​​the curved surface is small, the guiding effect of the curved surface on the fluid decreases, and it is also easy to form a structural dead angle at the curved surface, which leads to the accumulation of sediment at the curved surface, and then there is a risk of performance degradation or failure of the pressure regulating valve.

[0027] Preferably, the buffer cavity has a liquid outlet section away from the inlet flow channel and close to the first diaphragm, the liquid outlet section is connected to the first valve cavity, and the cross-sectional area of ​​the liquid outlet section is larger than the cross-sectional area of ​​the inlet flow channel and the buffer cavity. By adopting the above technical solution, the liquid outlet section can expand the flow of the fluid, thereby reducing the flow rate of the fluid when it flows into the first valve cavity, reducing the impact force of the fluid flowing into the first valve cavity, and reducing the impact of the fluid on the valve core; in addition, the fluid enters the first valve cavity at a smaller flow rate, which can also avoid serious turbulence caused by excessive flow rate.

[0028] Preferably, a confluence cavity is provided between the outlet flow channel and the second valve cavity, and the confluence cavity is an arc-shaped channel surrounding the connecting flow channel, so that the liquid in the second valve cavity enters the outlet flow channel after passing through the confluence cavity. With the above-mentioned technical solution, the fluid in the second valve cavity is guided by the confluence cavity before entering the outlet flow channel, so that the flow of the fluid is more stable. In addition, the fluid in the second valve cavity flows into the confluence cavity, which can reduce the residual or accumulation of sediment in the second valve cavity.

[0029] Other features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings:

[0031] Figure 1 A cross-sectional view of a pressure stabilizing valve of the utility model Figure 1 ;

[0032] Figure 2 for Figure 1 A partial enlarged view of part A;

[0033] Figure 3 This is an exploded view of a pressure-stabilizing valve of the utility model;

[0034] Figure 4 A cross-sectional view of a pressure stabilizing valve of the utility model Figure 2 ;

[0035] Figure 5 The structure of the intermediate valve body in a pressure-stabilizing valve of the utility model is shown in FIG. Figure 1 ;

[0036] Figure 6 The structure of the intermediate valve body in a pressure-stabilizing valve of the utility model is shown in FIG. Figure 2 ;

[0037] Figure 7 This is a cross-sectional view of an intermediate valve body in a pressure-stabilizing valve of the utility model;

[0038] Figure 8 The utility model is a schematic diagram of the structure of the first valve chamber in a pressure-stabilizing valve.

[0039] Figure numerals: 1 valve body, 11 upper valve body, 12 lower valve body, 13 middle valve body, 131 inlet flow channel, 132 outlet flow channel, 133 central axis, 14 first valve cavity, 141 flow expansion part, 142 liquid outlet part, 143 support member, 15 second valve cavity, 16 buffer cavity, 161 liquid separation section, 162 extension section, 163 liquid outlet section, 164 curved surface, 17 liquid confluence cavity, 2 valve core, 21 first diaphragm, 211 external fixing part, 212 deformation part, 213 internal fixing part, 22 second diaphragm. DETAILED DESCRIPTION

[0040] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] like Figures 1 to 7 As shown, this embodiment shows a pressure-stabilizing valve, including a valve body 1, a valve core 2 and an operating part. The valve body 1 is internally formed with a first valve cavity 14, a second valve cavity 15 and a connecting flow path. The first valve cavity 14 is connected to the second valve cavity 15 through the connecting flow path. An inlet flow channel 131 and an outlet flow channel 132 are respectively provided on both sides of the valve body 1. The inlet flow channel 131 is connected to the first valve cavity 14, and the outlet flow channel 132 is connected to the second valve cavity 15. The valve body 1 is assembled and spliced ​​from top to bottom by an upper valve body 11, a middle valve body 13 and a lower valve body 12, wherein the valve The seat is formed at the end of the flow path close to the first valve cavity 14. The valve core 2 is movably arranged inside the valve body 1 and passes through the middle of the intermediate valve body 13. A connecting flow path is formed between the valve core 2 and the intermediate valve body 13. The valve core 2 changes the degree of opening and closing between the valve core 2 and the intermediate valve body 13 in response to the pressure change of the fluid in the second valve cavity 15. The two ends of the valve core 2 are respectively provided with a first diaphragm 21 formed inside the first valve cavity 14 and a second diaphragm 22 formed inside the second valve cavity 15. The operating part acts on the top end of the valve core 2 and applies a force toward the first valve cavity 14 to the valve core 2.

[0045] like Figure 1 , Figure 2 as well as Figure 4As shown, in this embodiment, a buffer chamber 16 is provided between the inlet flow channel 131 and the first valve chamber 14, and the buffer chamber 16 includes a liquid separation section 161 facing the inlet flow channel 131 and an extension section 162 located on the side of the liquid separation section 161. The liquid separation section 161 and the extension section 162 are connected and arranged. In this embodiment, the fluid first enters the buffer chamber 16 after passing through the inlet flow channel 131, and enters the first valve chamber 14 under the guidance of the buffer chamber 16. The buffer chamber 16 can buffer the fluid, slow down the flow rate of the fluid entering the first valve chamber 14, enable the fluid to flow smoothly into the first valve chamber 14, reduce the influence of the fluid on the valve core 2, reduce the vibration amplitude of the valve core 2, make the movement of the valve core 2 more stable, and also reduce the noise generated when the valve core 2 moves, which is conducive to improving the running stability of the pressure stabilizing valve, and also can improve the working environment of the pressure stabilizing valve.

[0046] The aforementioned middle buffer chamber 16 includes a liquid separation section 161 and an extension section 162. After part of the fluid enters the liquid separation section 161, it will be guided to the extension section 162. Through the liquid separation section 161 and the extension section 162, the fluid can be expanded and dispersed in the buffer chamber 16, the flow rate of the fluid can be slowed down, and the liquid can enter the first valve chamber 14 in a more dispersed manner, so as to avoid the liquid entering the first valve chamber 14 only from a relatively small area, and causing the area of ​​the valve core 2 close to the liquid inlet channel 131 to be significantly greater than the impact force of the liquid on the other areas. Therefore, in this structure, the liquid separation section 161 and the extension section 162 allow the liquid to enter the first valve chamber 14 in a dispersed manner, so as to ensure that when the liquid flows in the first valve chamber 14 and contacts the side of the valve core 2, the difference in the impact force of the liquid on the valve core 2 at various circumferential locations will not be too large, thereby ensuring that the performance of the valve body is relatively stable when in use.

[0047] like Figure 4As shown, the inlet flow channel 131 in this embodiment has a central axis 133, the liquid separation section 161 is arranged exactly with respect to the central axis 133, and the buffer chamber 16 has two extension sections 162, which are respectively located on both sides of the liquid separation section 161 and symmetrically arranged with respect to the central axis 133, that is, the buffer chamber 16 is symmetrically arranged with respect to the central axis 133 as a whole. When the fluid enters the buffer chamber 16 from the inlet flow channel 131, the fluid directly impacts the liquid separation section 161, and then is divided to both sides of the liquid separation section 161 and enters the extension section 162. The buffer chamber 16 is symmetrically arranged with respect to the inlet flow channel 131, so that The fluid is evenly distributed to the two extension sections 162, thereby ensuring that the flow of the fluid in the buffer chamber 16 is more balanced, avoiding different liquid flow rates and speeds discharged from the two extension sections 162, thereby avoiding the valve core 2 vibration caused by a large difference in the force acting on different parts of the valve core 2; in addition, when the fluid enters the buffer chamber 16, the extension sections 162 on both sides can bear the impact force of the fluid, and can evenly disperse the pressure of the fluid on the inner wall of the buffer chamber 16, avoiding excessive pressure on one side that causes instability in the overall structure of the pressure-stabilizing valve, which is beneficial to improving the overall stability of the pressure-stabilizing valve.

[0048] In order to enable the fluid to flow into the extension section 162 more smoothly, the inner side wall of the liquid separation section 161 away from the inlet flow channel 131 in the present embodiment is arc-shaped, and the inner side wall extends to the extension sections 162 on both sides respectively and smoothly transitions with the extension sections 162. The extension section 162 is an arc-shaped channel surrounding the connecting flow path. When the fluid enters the buffer chamber 16 from the inlet flow channel 131, the fluid directly impacts the inner side wall of the liquid separation section 161 away from the inlet flow channel 131. Since the inner side wall adopts an arc-shaped design, the fluid flows to the extension sections 162 on both sides under the guidance of the inner side wall, so that the fluid can flow into the extension section 162 more smoothly. In addition, the extension section 162 is an annular channel, which can better fit the flow of the fluid, making the flow of the fluid in the extension section 162 smoother, so that the fluid can smoothly fill the extension section 162, which helps the fluid to expand in the buffer chamber 16, slow down the flow rate of the fluid, and enable the fluid to enter the first valve chamber 14 more smoothly.

[0049] Reference Figure 4 , the angle between the end points of the extension sections 162 on both sides away from the liquid separation section 161 and the line connecting the center of the first valve cavity 14 is θ, where θ≥60°. During the flow process, the liquid will first fill the buffer cavity 16, and then enter the first valve cavity 14 from the buffer cavity 16. When θ≥60°, the distribution area of ​​the liquid when entering the first valve cavity 14 is relatively large. After entering the first valve cavity 14, the liquid continues to diffuse during the flow process, and when it finally contacts the side of the valve core 2, the flow velocity distribution difference of the fluid in each area on the annular side of the entire side of the valve core 2 will not be too large, thereby avoiding the occurrence of unbalanced force on the valve core 2.

[0050] like Figure 4 As shown, the liquid separation section 161 described in this embodiment is arranged away from the inner side wall of the inlet flow channel 131 and directly opposite to the inlet flow channel 131. The projection of the inlet flow channel 131 in the direction of the central axis 133 has an area of ​​more than 80% overlapped with the inner side wall of the liquid separation section 161, which can ensure that the liquid in the inlet flow channel 131 will directly impact the side wall of the buffer cavity 16 when flowing into the buffer cavity 16, and in the turbulent area near the side wall, the turbulent area will serve as a static pressure area, so that when entering the first valve cavity 14 through the static pressure area, it will enter more smoothly. Avoid the vibration of the incoming liquid due to uneven pressure, which in turn causes the valve core to vibrate. At the same time, the turbulent area is located inside the buffer cavity 16, and will hardly affect the valve core 2 inside the first valve cavity 14.

[0051] like Figure 1 and Figure 2 As shown, in this embodiment, the first diaphragm 21 includes an outer fixing portion 211, a deformation portion 212 and an inner fixing portion 213, wherein the outer peripheral side of the outer fixing portion 211 is sealed and connected between the middle valve body 13 and the lower valve body 12, the outer fixing portion 211 is placed as a whole on the upper surface of the lower valve body 12, and the lower valve body 12 supports the outer fixing portion 211, the deformation portion 212 is located on the inner peripheral side of the outer fixing portion 211, the inner fixing portion 213 is located on the inner peripheral side of the deformation portion 212, and the inner fixing portion 213 is fixedly connected to the valve core 2, and during the up and down movement of the valve core 2, the inner fixing portion 213 drives the deformation portion 212 to deform, and in this embodiment, the side of the buffer chamber 16 away from the inlet flow channel 131 is the inner wall, and the inner wall is virtually extended downward to intersect with the top surface of the outer fixing portion 211. Among them, the virtual downward extension part of the inner wall of the buffer chamber 16 can be seen Figure 2 Dotted part.

[0052] In this case, after the liquid enters the first valve chamber 14 from the buffer chamber 16, the liquid will directly impact the outer fixed portion 211, but will not directly impact the deformation portion 212, the inner fixed portion 213 or the rest of the valve core 2. Moreover, since the bottom end of the outer fixed portion 211 is supported by the lower valve body 12, the impact force of the liquid will not cause deformation of the deformation portion 212 and the inner fixed portion 213, and will not cause the valve core 2 to move up and down, thereby avoiding the situation where the impact force of the liquid after entering the first valve chamber 14 causes the valve core 2 to swing or vibrate up and down.

[0053] Preferably, refer to Figure 2 , the inner wall of the buffer cavity 16 virtually extends downward ( Figure 2The dotted line portion) is perpendicular to the outer fixing portion. Compared with the inclined situation, the vertical setting can further prevent the situation where the liquid enters the first valve cavity 14, is reflected on the outer fixing portion 211, and then generates a large lateral impact force on the valve core 2. Thus, the impact of the impact force of the liquid on the valve core 2 can be further reduced.

[0054] At the same time, the vertical arrangement can ensure that the position of the outer fixing part 211 impacted by the liquid is relatively far from the deformation part 212, and the turbulence caused by the liquid impacting the outer fixing part 211 has little effect on the inner fixing part 213 and the deformation part 212, thereby further avoiding the vibration of the deformation part 212 and the inner fixing part 213. Moreover, in this case, the liquid is in the relatively outer area of ​​the first valve cavity 14, so when the liquid flows inward from this area to the deformation part 212 and the inner fixing part 213, it can ensure that the liquid is more dispersed, so as to avoid the liquid flow on one side of the valve core 2 being significantly larger than the flow in the other areas, resulting in uneven force on the valve core 2, and then causing the valve core 2 to vibrate.

[0055] The first valve chamber 14 includes a flow expansion portion 141 and a liquid outlet portion 142 located inside the flow expansion portion. The flow expansion portion 141 is located on the upper side of the outer fixed portion 211 and is connected to the buffer chamber 16. The liquid outlet portion 142 is located inside the outer fixed portion 211 and is connected to the connecting flow path, and the flow expansion portion 141 is an annular structure.

[0056] After the liquid in the buffer cavity 16 enters the first valve cavity 14, it will first enter the expansion portion 141, and the liquid will gradually diffuse and disperse in the process of flowing toward the liquid outlet portion 142, and the expansion portion 141 is further set as an annular structure, so that the liquid can diffuse and disperse to the entire annular area of ​​the expansion portion, so that when the liquid flows to the liquid outlet portion 142, the liquid is relatively dispersed at this time. In this case, when the liquid contacts the side of the valve core 2 or the deformation portion 212 in the valve core 2, the liquid distribution is relatively uniform at this time, so that the force on the valve core 2 can be relatively uniform. Therefore, the liquid flow rate on the side of the valve core 2 close to the inlet flow channel 131 will not be significantly higher than that in the other areas, which will impact the valve core 2, resulting in unbalanced force on the valve core 2, causing the valve core 2 to vibrate or swing. The expansion portion 141 is further provided with an annular structure with equal ring widths at various locations to ensure a more uniform distribution of the liquid.

[0057] A support member 143 is further provided inside the first valve cavity 14, and the support member 143 is provided between the top wall of the first valve cavity 14 and the outer fixing portion 211, so that the bottom end of the outer fixing portion 211 is always in contact with the bottom wall of the first valve cavity 14. The bottom end of the outer fixing portion 211 will be supported by the lower valve body 12 under normal conditions, and the liquid pressure inside the first valve cavity 14 acts on the outer fixing portion 211, and the pressure will also be supported by the lower valve body 12, so whether the force changes or not will not affect the axial movement of the valve core 2.

[0058] However, the arrangement of the aforementioned diffusion part will result in a larger area of ​​the outer fixed part 211. At this time, if the valve core 2 moves up and down, the deformation part 212 may drive the inner side of the outer fixed part 211 to move upward, so the bottom end of the outer fixed part 211 will be in a suspended state. Therefore, after the inner side of the outer fixed part 211 moves upward, the liquid pressure of the liquid inside the first valve cavity 14 on the outer fixed part 211 will also be partially used as a part of the axial force of the valve core 2, affecting the force balance of the valve core 2 and affecting the axial movement of the valve core 2. In this case, since the top of the first diaphragm 21 contacts the liquid and the bottom is suspended in a large area, when the pressure in the first valve cavity 14 changes, the combined force on the valve core 2 changes greatly, and affects the axial movement of the valve core 2, which will be far away from the desired performance that the axial movement of the valve core 2 is only affected by the liquid pressure in the second valve cavity 15, so it is difficult to ensure that the internal pressure of the second valve cavity 15 remains stable, resulting in poor valve body performance. By providing the support member 143, it is possible to limit the outer fixing portion 211 from being away from the lower valve body 12, thereby preventing the outer fixing portion 211 from moving upward and causing the bottom end of the outer fixing portion 211 to be suspended in the air, thereby preventing the force of the liquid on the outer fixing portion 211 from participating in the force balancing process of the valve core 2.

[0059] like Figure 2 and Figure 7 As shown, in this embodiment, the top of the inner wall of the buffer cavity 16 is provided with an upwardly concave curved surface 164, and the distance between the lowest end of the curved surface 164 and the top wall of the inlet flow channel 131 is H1, and the radius of the inlet flow channel 131 is R, wherein H1≥R / 2, and the concave curved surface 164 can guide the fluid to flow to the lower side of the buffer cavity 16, thereby reducing the structural dead angle at the upper end of the buffer cavity 16 and reducing the possibility of sediment accumulation in the buffer cavity 16; and when H1<R / 2, the overall area of ​​the curved surface 164 is smaller, and the guiding effect of the curved surface 164 on the fluid is reduced. At the same time, it is also easy to form a structural dead angle at the curved surface 164, which leads to the accumulation of sediment at the curved surface 164, and then there is a risk of performance degradation or failure of the pressure regulating valve.

[0060] like Figure 2 and Figure 7As shown, the buffer cavity 16 in this embodiment has a liquid outlet section 163 away from the inlet flow channel 131 and close to the first diaphragm 21, the top end surface of the liquid outlet section 163 is not higher than the bottom end surface of the inlet flow channel 131, and the lower end of the liquid outlet section 163 is connected to the first valve cavity 14. The arrangement of the liquid outlet section 163 can further guide the flow of the liquid, especially in the aforementioned structure, when the virtual extension wall of the inner side wall of the buffer cavity 16 intersects with the outer fixed portion 211, the arrangement on the liquid outlet section 163 can further ensure the flow direction of the liquid when leaving the buffer cavity 16, that is, it can ensure that the liquid will directly hit the outer fixed portion 211. At the same time, the cross-sectional area of ​​the liquid outlet section 163 is larger than the cross-sectional area of ​​the connection point between the inlet flow channel 131 and the buffer chamber 16, so as to ensure that when the liquid flows out from the liquid outlet section 163 to the inside of the first valve chamber 14, the flow speed of the liquid is relatively slow, thereby reducing the impact force of the liquid on the external fixed part 211, reducing liquid turbulence, and reducing the noise in the process of the liquid flowing to the first valve chamber 14 and impacting the external fixed part 211.

[0061] The fluid flows into the buffer chamber 16 from the inlet flow channel 131. First, the fluid is at the upper side of the liquid outlet section 163, and then the fluid flows downward and enters the liquid outlet section 163. After passing through the liquid outlet section 163, the fluid enters the first valve chamber 14. The liquid outlet section 163 can expand the fluid, thereby reducing the flow rate of the fluid when it flows into the first valve chamber 14, reducing the impact force of the fluid flowing into the first valve chamber 14, and reducing the impact of the fluid on the valve core 2; at the same time, the fluid enters the first valve chamber 14 at a smaller flow rate, which can avoid serious turbulence caused by excessive flow rate.

[0062] like Figure 1 and Figure 5 As shown, in this embodiment, the side of the punching cavity close to the inlet flow channel 131 is the outer wall, and the outer wall of the buffer cavity 16 is arranged on the same wall as the outer wall of the first valve cavity 14. The use of this structure can reduce unnecessary wall structure and space occupancy, and can make the internal structure of the valve body 1 more compact, reduce the overall volume of the valve body 1, and is beneficial to the transportation and storage of the valve body 1; in addition, the common wall structure can reduce the connection points, make the outer wall of the buffer cavity 16 smoother, reduce the existence of dead corners, and help reduce the turbulence of the liquid.

[0063] like Figure 6 and Figure 7As shown, in this embodiment, a confluence chamber is arranged between the outlet flow channel 132 and the second valve chamber 15. The confluence chamber is an arc-shaped channel surrounding the connecting flow channel, so that the liquid in the second valve chamber 15 enters the outlet flow channel 132 after passing through the confluence chamber. Before entering the outlet flow channel 132, the fluid in the second valve chamber 15 is first guided by the confluence chamber 17 to make the flow of the fluid smoother. In addition, the fluid in the second valve chamber 15 flows into the confluence chamber 17, which can reduce the residual or accumulation of sediment in the second valve chamber 15. It should be noted that the structure of the confluence chamber is similar to that of the buffer chamber 16.

[0064] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A pressure stabilizing valve, include: A valve body, wherein a first valve cavity, a second valve cavity and a communication flow path are formed inside, and the first valve cavity is connected with the second valve cavity through the communication flow path; The valve core is disposed inside the valve body and includes a first diaphragm formed inside the first valve cavity and a second diaphragm formed inside the second valve cavity; An operating part acts on the valve core and applies a force to the valve core toward the first valve cavity; A valve seat is formed on the communication flow path, and the valve core changes the opening and closing degree between the valve core and the valve seat in response to the pressure change of the fluid in the second valve chamber; an inlet flow channel, communicating with the first valve chamber; An outlet flow channel communicated with the second valve chamber; It is characterized in that A buffer chamber is provided between the inlet flow channel and the first valve chamber, the buffer chamber comprising a liquid separation section facing the inlet flow channel and an extension section located on the side of the liquid separation section, the liquid separation section and the extension section are connected; The liquid in the inlet flow channel flows through the buffer cavity and then enters the first valve cavity.

2. The pressure regulating valve according to claim 1, It is characterized in that The inner side wall of the liquid separation section is arranged opposite to the inlet flow channel, and on the projection plane perpendicular to the axis of the inlet flow channel, more than 80% of the projection area of ​​the inlet flow channel coincides with the projection of the inner side wall of the liquid separation section.

3. The pressure regulating valve according to claim 2, It is characterized in that The extension section is an arc-shaped channel surrounding the connecting flow path.

4. The pressure regulating valve according to claim 3, It is characterized in that The liquid separation section is provided with extension sections on both sides of the inlet flow channel, so that the buffer cavity is symmetrically arranged with respect to the inlet flow channel.

5. The pressure regulating valve according to claim 4, It is characterized in that The angle between the end points of the extension sections on both sides away from the liquid separation section and the line connecting the center of the first valve cavity is θ, wherein θ≥60°.

6. The pressure regulating valve according to claim 1, It is characterized in that The side of the buffer cavity close to the inlet flow channel is an outer wall, and the outer wall of the buffer cavity is arranged together with the outer wall of the first valve cavity.

7. The pressure regulating valve according to claim 1, It is characterized in that The first diaphragm includes an outer fixing portion, a deformation portion and an inner fixing portion. A support wall for supporting the bottom end of the outer fixing portion is provided in the valve body. The inner side wall of the buffer cavity virtually extends downward and intersects with the top surface of the outer fixing portion.

8. The pressure regulating valve according to claim 7, It is characterized in that The inner side wall of the buffer cavity is virtually extended downward and is perpendicular to the top surface of the outer fixing portion.

9. The pressure regulating valve according to claim 7, It is characterized in that The first valve cavity includes a flow expansion portion and a liquid outlet portion located inside the flow expansion portion, the flow expansion portion is located on the upper side of the outer fixed portion and is connected to the buffer cavity, and the liquid outlet portion is located inside the outer fixed portion and is connected to the communication flow path; Wherein, the flow expansion part is an annular structure with equal ring width at each location.

10. The pressure regulating valve according to claim 9, It is characterized in that A support member is disposed inside the first valve cavity. The support member is disposed between the top wall of the first valve cavity and the outer fixing portion and restricts the outer fixing portion from moving in a direction toward the connecting flow path.

11. The pressure regulating valve according to claim 1, It is characterized in that A confluence cavity is provided between the outlet flow channel and the second valve cavity. The confluence cavity is an arc-shaped channel surrounding the connecting flow channel, so that the liquid in the second valve cavity enters the outlet flow channel after passing through the confluence cavity.

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