Sensitive waterproof hydraulic piston valve

Abstract

The invention discloses a sensitive water-hammer-proof hydraulic piston valve which comprises a main valve body defining a flow channel; the flow guide body is installed in the main valve body, and a flow channel is formed between the peripheral wall of the flow guide body and the inner side wall of the main valve body; the upstream end of the flow guide body is provided with a flow guide face, and the downstream end of the flow guide body is provided with a limiting ring groove. The first end of the piston structure is slidably mounted in the limiting ring groove so as to be matched with the flow guide body to form a control cavity; the auxiliary valve body is arranged at the outlet end of the flow channel and is connected with the main valve body; the auxiliary valve body is provided with a valve seat, a main sealing ring is arranged at the second end of the piston structure, and the main sealing ring is in sealing connection with the valve seat so as to cut off communication between the inlet end and the outlet end of the flow channel. The sensitive waterproof hydraulic piston valve is hydraulically driven, the opening and closing speed in the whole stroke range is sensitive and adjustable, and the valve closing buffering function is achieved so as to prevent water impact damage.

Description

Technical Field

[0001] This application relates to the field of control valve technology, and in particular to a sensitive waterproof water-impact piston valve. Background Technology

[0002] Piston valves, due to their unique annular channel and balanced valve core, possess excellent flow and pressure regulation performance. Conventional piston valves rely on external power to drive the valve piston via a crank-connecting rod mechanism to achieve valve opening, closing, and regulation. However, patent CN201922420473.8 creatively proposes a pressure-regulating and flow-regulating valve that improves upon an externally driven piston valve by hydraulic actuation. This pressure-regulating and flow-regulating valve can effectively reduce valve costs and expand application scenarios. However, the following problems arise during its implementation: 1. The piston chamber inside the valve is too large. The operation of the valve plug is achieved by the change in the volume of the medium inside the piston chamber. Too much medium causes the valve to operate slowly. Especially in the case of large-diameter pressure relief, there is a great risk of upstream pipe burst due to untimely pressure relief. 2. The closing speed of this valve is negatively correlated with the valve opening degree. That is, the larger the opening degree, the slower the action, and the smaller the closing degree, the faster the action. This is not conducive to the operation of the valve with a small opening degree and small flow rate. At the same time, the rapid closing of the valve can also cause a sudden pressure rise upstream, which may lead to a water hammer and pipe burst safety accident. 3. When the valve plug is fully open, the pressure difference between the upstream and downstream can drop to almost the same level. At the same time, there is an inevitable friction between the valve plug and the valve body. When the thrust generated by the pressure difference is equal to or less than the friction, the valve will malfunction. Without external intervention, the valve will not be able to resume operation on its own, posing a great safety hazard.

[0003] In summary, the above-mentioned problems must be solved in order to make the pressure regulating and flow regulating valves practically usable. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this application proposes a sensitive water-impact hydraulic piston valve, which is hydraulically driven, with sensitive and adjustable opening and closing speeds across the entire stroke range, and has a valve closing buffer function to prevent water impact damage.

[0005] The sensitive waterproof hydraulic piston valve of this application embodiment includes: Main valve body; A guide fluid is installed inside the main valve body, and a flow channel is formed between the outer peripheral wall of the guide fluid and the inner side wall of the main valve body; the water-facing end of the guide fluid is provided with a guide surface, and the water-receiving end of the guide fluid is provided with a limiting ring groove. A piston structure, wherein the first end of the piston structure is slidably installed in the limiting ring groove and is sealed to the side wall of the limiting ring groove, and the piston structure cooperates with the guide fluid to form a control cavity; A secondary valve body is located at the outlet end of the flow channel and is connected to the main valve body; The secondary valve body is provided with a valve seat, and the second end of the piston structure is provided with a main sealing ring. The main sealing ring is sealed to the valve seat to cut off the connection between the inlet end and the outlet end of the flow channel.

[0006] In some embodiments of this application, the backwater end of the guide fluid is coaxially provided with an outer cylinder structure and an inner cylinder structure, and a limiting annular groove is formed between the outer cylinder structure and the inner cylinder structure. The first end of the piston structure is slidably installed between the outer cylinder structure and the inner cylinder structure, and is sealed to the outer cylinder structure and the inner cylinder structure.

[0007] In some embodiments of this application, the first end of the piston structure is provided with a first ring cylinder and a second ring cylinder, the first ring cylinder being sealed to the outer cylinder structure, and the second ring cylinder being sealed to the inner cylinder structure; An elastic element is installed inside the control cavity. The elastic element is installed between the outer cylinder structure and the inner cylinder structure, and both ends of the elastic element abut against the fluid guide and the piston structure, respectively.

[0008] In some embodiments of this application, the second end of the piston structure is connected to a piston cylinder, and the main sealing ring is disposed between the piston structure and the piston cylinder.

[0009] In some embodiments of this application, the outer diameter of the first ring cylinder is larger than the outer diameter of the piston cylinder, and the outer diameter of the piston cylinder is larger than the inner diameter of the second ring cylinder.

[0010] In some embodiments of this application, the secondary valve body is provided with a buffer groove, and the second end of the piston structure is provided with a buffer ring, the buffer ring being correspondingly arranged with the buffer groove; when the main sealing ring is sealed to the valve seat, the buffer ring is inserted into the buffer groove. The opening of the buffer groove faces the piston structure, and when the buffer ring is inserted into the buffer groove, the buffer ring is sealed to the groove wall of the buffer groove. The buffer tank is connected to the water inlet of the flow channel via a buffer pipe, and the buffer pipe is equipped with a buffer one-way regulating valve.

[0011] In some embodiments of this application, the second end of the piston structure is further provided with a groove, which is disposed on the inner side of the buffer ring and is used for the valve seat to be embedded. The piston structure is provided with a flow guide hole, which connects the slot and the water inlet end of the flow channel.

[0012] In some embodiments of this application, the fluid guide is equipped with an auxiliary structure for driving the piston structure to move away from the main valve body.

[0013] In some embodiments of this application, the control cavity is connected to a first pressure-sensing hole, which is connected to the water inlet of the flow channel via a pressure-sensing pipe, and the pressure-sensing pipe is equipped with a pressure-sensing regulating valve.

[0014] In some embodiments of this application, the sensitive waterproof water-slamming piston valve further includes: The valve stem is rotatably inserted into the main valve body about its own axis; A rocker arm, the first end of which is sleeved on the valve stem and is connected to the valve stem in a transmission manner; The connecting rod is hinged to the second end of the rocker arm; A support is mounted on the piston structure, and the support is hinged to the connecting rod. The axial rotation of the valve stem drives the rocker arm to rotate, and ultimately causes the piston structure to slide relative to the fluid guide.

[0015] The sensitive waterproof hydraulic piston valve of this application embodiment has at least the following beneficial effects: By installing auxiliary structures, the piston structure can still move stably even when the pressure difference between the inlet and outlet ends of the flow channel is nearly uniform, preventing valve malfunction. Opening the first pressure tap allows for rapid pressure relief of the control chamber, enabling rapid valve opening and preventing safety accidents such as water hammer and pipe bursts caused by sudden pressure increases upstream. By adjusting the opening of the pressure tap pipe with the pressure tap regulating valve and controlling the opening of the buffer pipe with the buffer one-way regulating valve, the valve can be operated with a small opening and small flow rate, while avoiding safety accidents such as water hammer and pipe bursts caused by sudden pressure increases upstream due to rapid valve opening and closing. The main valve body is equipped with a valve stem extending from the main valve body. The valve stem is connected to the piston structure through a rocker arm, connecting rod, and support, making it easy to observe the valve's operation from the outside. In addition, when the valve becomes stuck, the valve can be opened or closed by externally rotating the valve stem.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the piston valve in the open state according to an embodiment of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3This is a schematic diagram of the piston valve in the closed state according to an embodiment of this application; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram illustrating the application of a first embodiment of the piston valve in this application. Figure 6 This is a schematic diagram illustrating the application of a second embodiment of the piston valve in this application. Figure 7 This is a schematic diagram illustrating the third embodiment of the piston valve in this application.

[0018] Icon labels: Main valve body 100, flow channel 110, valve stem 120, rocker arm 121, connecting rod 122, support 123; The components include: a flow guide 200, a flow guide surface 210, an outer cylinder structure 220, an inner cylinder structure 230, a control cavity 240, a first pressure tapping hole 241, a second pressure tapping hole 242, an elastic element 250, a pressure tapping pipe 260, and a pressure tapping regulating valve 261. Piston structure 300, main sealing ring 310, buffer ring 320, groove 330, guide hole 331, first ring cylinder 340, second ring cylinder 350, piston cylinder 360; Sub-valve body 400, valve seat 410, buffer groove 420, buffer tube 430, buffer one-way regulating valve 431; Pilot valve 500, drain regulating valve 510, float pilot valve 520, float structure 521; Pressure relief pilot valve 600, pressure sensing tube 610, pressure relief tube 620, pressure relief regulating valve 621, emergency tube 630, emergency pressure relief valve 631; Pressure reducing and stabilizing valve 700, pressure connecting pipe 710. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The embodiments of this application may omit unnecessary detailed descriptions. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0024] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0025] Reference Figures 1 to 4 This application discloses a sensitive waterproof water-impact piston valve, including a main valve body 100, a guide fluid 200, and a piston structure 300. The guide fluid 200 is installed inside the main valve body 100, and a flow channel 110 is formed between the outer peripheral wall of the guide fluid 200 and the inner side wall of the main valve body 100. The water-facing end of the guide fluid 200 is provided with a guide surface 210, which is preferably an arc-shaped surface, and the water-repellent end of the guide fluid 200 is provided with a limiting ring groove. The first end of the piston structure 300 is slidably installed in the limiting ring groove and is sealed to the side wall of the limiting ring groove. The piston structure 300 and the guide fluid 200 cooperate to form a control cavity 240. Figure 1 , Figure 3 For example, when the piston structure 300 slides along the limiting ring groove, the volume of the control cavity 240 will change, but the first end of the piston structure 300 will not leave the limiting ring groove. The rate at which the volume of the control cavity 240 changes will affect the sliding speed of the piston structure 300. Therefore, by adjusting the rate at which the volume of the control cavity 240 changes, the sliding speed of the piston structure 300 can be adjusted.

[0026] In some specific embodiments of this application, the control cavity 240 is connected to a first pressure-inlet hole 241 and a second pressure-inlet hole 242. The first pressure-inlet hole 241 is connected to the water inlet end of the flow channel 110 through a pressure-inlet pipe 260. A pressure-inlet regulating valve 261 is installed on the pressure-inlet pipe 260. The second pressure-inlet hole 242 is connected to the control component. The volume change of the control cavity 240 is controlled by the difference in the flow rate of the medium flowing in and out through the first pressure-inlet hole 241 and the second pressure-inlet hole 242. For example, when the medium flowing into the control chamber 240 through the first pressure hole 241 is less than the medium flowing out of the control chamber 240 through the second pressure hole 242, the piston structure 300 slides towards the main valve body 100 to open the valve; correspondingly, when the medium flowing into the control chamber 240 through the first pressure hole 241 is more than the medium flowing out of the control chamber 240 through the second pressure hole 242, the piston structure 300 slides away from the main valve body 100 to close the valve; when the medium flowing into the control chamber 240 through the first pressure hole 241 is basically the same as the medium flowing out of the control chamber 240 through the second pressure hole 242, the piston structure 300 is in a balanced state of a certain opening degree.

[0027] When the diameters of both the first pressure-inlet hole 241 and the second pressure-inlet hole 242 are sufficiently large, and the diameter of the second pressure-inlet hole 242 is much larger than the diameter of the first pressure-inlet hole 241, then theoretically, when the second pressure-inlet hole 242 is closed, the piston structure 300 will quickly slide away from the main valve body 100 to achieve instantaneous valve closure; when the second pressure-inlet hole 242 is open, the piston structure 300 will quickly slide towards the main valve body 100 to achieve instantaneous valve opening.

[0028] However, in specific implementations, the diameters of both the first pressure-sensing hole 241 and the second pressure-sensing hole 242 are limited, ensuring that their flow capacity is a fixed value that meets operational requirements. To regulate the sliding speed of the piston structure 300, especially the valve closing speed, a pressure-sensing regulating valve 261 is typically installed on the pressure-sensing pipe 260 connected to the first pressure-sensing hole 241, provided that the flow capacity of the second pressure-sensing hole 242 is greater than that of the first pressure-sensing hole 241. The opening degree of the pressure-sensing regulating valve 261 controls the unit flow rate of the pressure-sensing pipe 260, thereby further controlling the amount of medium entering the control chamber 240 through the first pressure-sensing hole 241, thus achieving control over the valve's operating speed, especially the valve closing speed.

[0029] In a further specific embodiment, the second pressure inlet 242 is usually connected to the discharge pipe, and the discharge pipe connected to the second pressure inlet 242 is usually equipped with a corresponding regulating valve to better control the valve opening speed.

[0030] In some embodiments of this application, the number of first pressure-sensing holes 241 can be specifically set according to actual conditions, and is not limited in this embodiment. The pressure-sensing regulating valve 261 can be configured to enable remote opening and closing and adjustment of the opening degree as required.

[0031] In some embodiments of this application, reference is made to Figure 1 , Figure 3 As shown, the backwater end of the guide fluid 200 is provided with an outer cylinder structure 220 and an inner cylinder structure 230, which are coaxially arranged and form a limiting annular groove between them. The first end of the piston structure 300 is slidably installed between the outer cylinder structure 220 and the inner cylinder structure 230, and is sealed to both. Specifically, the first end of the piston structure 300 is provided with a first annular cylinder 340 and a second annular cylinder 350. The first annular cylinder 340 is sealed to the outer cylinder structure 220, and the second annular cylinder 350 is sealed to the inner cylinder structure 230. The sealing connection between the first annular cylinder 340 and the outer cylinder structure 220 can be achieved by installing a sealing ring between them. Similarly, the sealing connection between the second annular cylinder 350 and the inner cylinder structure 230 can be achieved by installing a sealing ring between them.

[0032] In some embodiments of this application, reference is made to Figure 1 , Figure 3 As shown, the second end of the piston structure 300 is connected to a piston cylinder 360; the main valve body 100 is also connected to a secondary valve body 400, which is located at the outlet end of the flow channel 110; see reference. Figure 2 , Figure 4 As shown, a main sealing ring 310 is provided between the piston structure 300 and the piston cylinder 360, and a valve seat 410 is provided in the secondary valve body 400. When the piston structure 300 moves towards the secondary valve body 400 to the end position of its stroke, the main sealing ring 310 and the valve seat 410 are sealed together to cut off the connection between the inlet and outlet of the flow channel 110. The main sealing ring 310 is usually made of a flexible material such as rubber.

[0033] In some embodiments of this application, the flow pattern of the piston cylinder 360 is not limited in this embodiment. For example, the piston cylinder 360 can be provided with flow patterns such as orifice, groove, and V-shaped notch according to actual conditions.

[0034] In some embodiments of this application, reference is made to Figure 2 , Figure 4As shown, the secondary valve body 400 is also provided with a buffer groove 420, and the second end of the piston structure 300 is provided with a buffer ring 320, which is correspondingly arranged with the buffer groove 420. When the main sealing ring 310 is sealed to the valve seat 410, the buffer ring 320 is inserted into the buffer groove 420. Specifically, the opening of the buffer groove 420 faces the piston structure 300, and when the buffer ring 320 is inserted into the buffer groove 420, the buffer ring 320 is sealed to the groove wall of the buffer groove 420.

[0035] In some embodiments of this application, reference is made to Figure 4 As shown, the buffer tank 420 is connected to the inlet end of the flow channel 110 via a buffer pipe 430. A buffer one-way regulating valve 431 is installed on the buffer pipe 430. When the medium flows from the buffer tank 420 to the inlet end of the flow channel 110, the flow rate of the medium is limited by the regulation of the buffer one-way regulating valve 431. When the medium flows from the inlet end of the flow channel 110 to the buffer tank 420, the flow rate of the medium is not limited by the regulation of the buffer one-way regulating valve 431. When the buffer ring 320 is inserted into the buffer tank 420 and the buffer ring 320 is sealed to the tank wall of the buffer tank 420, the medium in the buffer tank 420 can only flow in or out through the buffer pipe 430. Therefore, by adjusting the opening of the buffer pipe 430 through the buffer one-way regulating valve 431, the flow rate of the medium out of the buffer tank 420 can be controlled, preventing the buffer ring 320 from quickly entering the buffer tank 420, thereby avoiding water hammer and pipe burst accidents caused by the instantaneous pressure fluctuation upstream due to the rapid closure of the valve.

[0036] When the piston structure 300 slides towards the secondary valve body 400 to close the valve, and the buffer ring 320 enters the buffer groove 420, the medium in the buffer groove 420 will flow through the buffer pipe 430 to the water inlet end of the flow channel 110. At this time, by adjusting the opening of the buffer pipe 430 through the buffer one-way regulating valve 431, the buffer ring 320 can be blocked from sliding quickly along the buffer groove 420, so that the buffer ring 320 slides slowly along the buffer groove 420 until the main sealing ring 310 is sealed to the valve seat 410. Conversely, when the piston structure 300 slides away from the secondary valve body 400 to open the valve, the medium at the inlet end of the flow channel 110 will flow into the buffer tank 420 through the buffer pipe 430. At this time, the buffer one-way regulating valve 431 has no regulating function, and the medium at the inlet end of the flow channel 110 can flow into the buffer tank 420 quickly through the buffer pipe 430, so that the buffer ring 320 can slide freely along the buffer tank 420 until the buffer ring 320 disengages from the buffer tank 420, and the valve opens normally.

[0037] In some embodiments of this application, reference is made to Figure 4As shown, when the piston structure 300 slides towards the secondary valve body 400 to close the valve, the medium between the valve seat 410 and the end face of the second end of the piston structure 300 is also compressed and has no outflow channel, which may cause the valve to not close tightly. Therefore, the second end of the piston structure 300 is provided with a groove 330 for the valve seat 410 to be inserted. The groove 330 is located inside the buffer ring 320, and the piston structure 300 is provided with a guide hole 331, which connects the groove 330 and the water inlet end of the flow channel 110. When the piston structure 300 slides towards the secondary valve body 400 to close the valve, the valve seat 410 can be inserted into the groove 330, and the medium between the valve seat 410 and the groove 330 can be connected to the medium in the flow channel 110 through the guide hole 331, thereby ensuring that the valve can be closed tightly.

[0038] In some embodiments of this application, since there is frictional resistance when the piston structure 300 slides, it is difficult to move the piston structure 300 in the direction of closing the valve directly by water power alone. Therefore, the guide fluid 200 is equipped with an auxiliary structure, which is used to drive the piston structure 300 to move in a direction away from the guide fluid 200.

[0039] In some specific embodiments, the auxiliary structure is an elastic element 250, which is installed inside the control cavity 240 and between the outer cylinder structure 220 and the inner cylinder structure 230. Both ends of the elastic element 250 abut against the fluid guide 200 and the piston structure 300, respectively. Depending on the actual situation, one or more elastic elements 250 can be provided. When multiple elastic elements 250 are provided, they are preferably evenly spaced around the circumference.

[0040] In some embodiments of this application, the sensitive waterproof hydraulic piston valve further includes a valve stem 120, a rocker arm 121, a connecting rod 122, and a support 123, as shown in the reference. Figure 1 , Figure 3 As shown, the valve stem 120 is rotatably mounted on the main valve body 100 around its own axis, and extends beyond the main valve body 100. The first end of the rocker arm 121 is sleeved on the valve stem 120 and is kinetically connected to it. The connecting rod 122 is hinged to the second end of the rocker arm 121. The support 123 is mounted on the piston structure 300, and is hinged to the connecting rod 122. The axial rotation of the valve stem 120 causes the rocker arm 121 to rotate, which in turn drives the connecting rod 122 to move. The connecting rod 122 causes the piston structure 300 to slide relative to the fluid guide 200. Similarly, the sliding of the piston structure 300 relative to the fluid guide 200 will ultimately cause the valve stem 120 to rotate.

[0041] It should be understood that the valve stem 120 in this embodiment is not the main power source for driving the piston structure 300 to slide. The piston structure 300 in this embodiment can also slide under the pressure difference between the first end and the second end. Therefore, when the piston structure 300 slides relative to the guide fluid 200 under the action of water, the valve stem 120 can be used to directly observe the opening of the valve from the outside. When the piston structure 300 is blocked or has other faults, the valve stem 120 can be used as an external power source to directly drive the piston structure 300 to slide relative to the guide fluid 200, so as to realize the opening and closing of the piston valve in this embodiment.

[0042] It is conceivable that the auxiliary structure could also be an auxiliary counterweight or similar structure configured on the part of the valve stem 120 that extends out of the main valve body 100. The auxiliary counterweight can use gravity to continuously drive the piston structure 300 to move closer to the secondary valve body 400.

[0043] In some embodiments of this application, the control cavity 240 is also connected to a second pressure port 242, which extends to the outside of the main valve body 100 and is connected to a control device for controlling its opening and closing.

[0044] As can be seen from the above, the control cavity 240 is connected to the first pressure-guiding hole 241. The number of the first pressure-guiding hole 241 and the second pressure-guiding hole 242 is not limited in this embodiment. For example, the control cavity 240 may be connected to only one first pressure-guiding hole 241 and one second pressure-guiding hole 242, or the control cavity 240 may be connected to one first pressure-guiding hole 241 and multiple second pressure-guiding holes 242, or the control cavity 240 may be connected to multiple first pressure-guiding holes 241 and one second pressure-guiding hole 242, or the control cavity 240 may be connected to multiple first pressure-guiding holes 241 and multiple second pressure-guiding holes 242.

[0045] In some embodiments of this application, reference is made to Figure 3 As shown, the outer diameter of the first ring cylinder 340 is defined as D1, the outer diameter of the piston cylinder 360 is defined as D2, and the outer diameter of the second ring cylinder 350 is defined as D3. Furthermore, we define the annular area between D1 and D2 as A1, the annular area between D2 and D3 as A2, and the annular area between D1 and D3 as A3, where A3 = A1 + A2; Furthermore, the medium pressure at the inlet of the flow channel 110 is defined as P1, the medium pressure at the outlet of the flow channel 110 is defined as P2, and the medium pressure in the control chamber 240 is defined as P3.

[0046] By rationally designing the dimensions of D1, D2, and D3, the hydraulically driven piston structure 300 can slide relative to the guide fluid 200, thereby realizing the opening and closing of the hydraulic piston valve in this embodiment. For example, in the embodiment of this application, the outer diameter of the first annular cylinder 340 is larger than the outer diameter of the piston cylinder 360, and the outer diameter of the piston cylinder 360 is larger than the inner diameter of the second annular cylinder 350.

[0047] Combination Figure 1 , Figure 3 It can be seen that the forces of P3×A3 in the control cavity 240 and the forces of the elastic element 250 both act on the first end of the piston structure 300, while the forces of P1×A1 and P2×A2 in the flow channel 110 both act on the second end of the piston structure 300. Therefore: When the force of P3×A3 and the force of the elastic element 250 are greater than the force of P1×A1 plus the force of P2×A2, the piston structure 300 slides toward the secondary valve body 400, that is, slides toward the valve closing direction. When the force of P3×A3 and the force of the elastic element 250 are less than the force of P1×A1 plus the force of P2×A2, the piston structure 300 slides toward the main valve body 100, that is, slides toward the valve opening direction. When the force of P3×A3 and the force of the elastic element 250 are equal to the force of P1×A1 plus the force of P2×A2, the piston structure 300 remains in the current position.

[0048] To facilitate understanding of the specific application of the hydraulic regulating valve in this embodiment, the following embodiments are provided in this application: Example 1 The hydraulic control valve in this embodiment is used for water level control, so that the liquid level in the cavity can be automatically replenished when the level is low and stopped when the level is high.

[0049] Reference Figure 5 As shown, the second pressure inlet 242 is connected to the pilot valve pipe 500, the pilot valve pipe 500 is equipped with a drain regulating valve 510, and the end of the pilot valve pipe 500 is connected to the float pilot valve 520. The float pilot valve 520 is controlled to open and close by the float structure 521.

[0050] Specifically, the float structure 521 is placed inside the cavity, which can be a water storage tank or other equipment. The float structure 521 will open and close the float pilot valve 520 according to the liquid level in the cavity. For example, when the float structure 521 is at a high liquid level, the float pilot valve 520 is closed, and when the float structure 521 is at a low liquid level, the float pilot valve 520 is open.

[0051] by Figure 5For example, initially, the float structure 521 is at a high liquid level, the float pilot valve 520 is closed, and the valve is in the closed state, meaning the main sealing ring 310 of the piston structure 300 is sealed to the valve seat 410. Pressure medium enters the inlet end of the flow channel 110. Part of the medium enters the buffer tank 420 through the buffer pipe 430 and the buffer one-way regulating valve 431, and then acts on the buffer ring 320 at the second end of the piston structure 300. Simultaneously, part of the medium also enters the slot 330 through the guide hole 331. The combined area of ​​the pressure exerted by the medium entering the buffer tank 420 and the slot 330 is the annular area A1. Another part of the medium enters the control chamber 240 through the pressure tapping pipe 260, the pressure regulating valve 261, and the first pressure tapping hole 241. The area of ​​the pressure exerted by the medium in the control chamber 240 is the annular area A3. The inlet of flow channel 110 is connected to the control chamber 240, so P1=P3. Since the hydraulic regulating valve replenishes water into the chamber, when the hydraulic regulating valve is closed, the outlet of flow channel 110 is directly open to the atmosphere or only to the height of the water tank. Therefore, the pressure P2 at the outlet of flow channel 110 is almost zero.

[0052] In summary, when the valve is closed, P3=P1 and A3>A1, so the force on the first end of the piston structure 300 is greater than the force on the second end, and the piston structure 300 remains in the sealed connection position between the main sealing ring 310 and the valve seat 410.

[0053] When the liquid level in the cavity decreases, the float structure 521 falls, causing the float pilot valve 520 to connect with the atmosphere. This, in turn, allows the control cavity 240 to connect with the atmosphere through the second pressure hole 242 and the pilot valve pipe 500. The medium pressure P3 in the control cavity 240 decreases. When the medium pressure P3 in the control cavity 240 decreases to the point where the force on the first end of the piston structure 300 is less than the force on the second end, the piston structure 300 and the piston cylinder 360 move toward the valve opening direction. The piston structure 300 disengages from the auxiliary valve body 400, the valve opens, and the medium flows into the downstream water tank through the valve.

[0054] When the liquid level in the cavity rises, the float structure 521 rises, causing the float pilot valve 520 to close, and the medium pressure P3 in the control cavity 240 increases. When the medium pressure P3 in the control cavity 240 rises to the point that the force on the first end of the piston structure 300 is greater than the force on the second end, the piston structure 300 and the piston cylinder 360 move toward the valve closing direction until the main sealing ring 310 and the valve seat 410 are sealed together.

[0055] In this embodiment, the speed of valve closing can be controlled by the opening degree of the pressure regulating valve 261 and the drain regulating valve 510. The drain regulating valve 510 has a large opening degree and a fast opening speed; the pressure regulating valve 261 has a small opening degree and a slow closing speed. The final valve closing stage is the same as described above. The buffer ring 320 first enters the buffer groove 420 to avoid the upstream pressure impact caused by the rapid closing of the piston structure 300. The buffering time is controlled by the buffer one-way regulating valve 431 until the valve is finally completely closed.

[0056] It should be noted that, under the same specifications, quantity, pipe diameter, and valve size, the opening of the pressure regulating valve 261 cannot be greater than the opening of the drain regulating valve 510; otherwise, the pressure in the control chamber 240 will not change with the movement of the float pilot valve 520, causing the valve to malfunction.

[0057] Example 2 The hydraulic control valve in this embodiment is used for pressure relief and pressure holding. The operating conditions of the valve with pressure relief and pressure holding function are that there is a pressurized medium at the valve inlet and the valve outlet is open to the atmosphere. When the medium pressure at the valve inlet exceeds a certain set value, the valve should open quickly to relieve pressure and protect the upstream safety.

[0058] Reference Figure 6 As shown, the second pressure inlet 242 is connected to the inlet of the pressure relief pilot valve 600. The pressure relief pilot valve 600 also has a drive unit and a discharge port. The drive unit is connected to the water inlet of the flow channel 110 through the pressure sensing tube 610, and the discharge port is connected to the water outlet of the flow channel 110 through the pressure relief pipe 620. The pressure relief pipe 620 is equipped with a pressure relief regulating valve 621. The pressure relief pipe 620 can be used as follows: Figure 6 The valve body 400 is connected to the auxiliary valve body to connect with the outlet of the flow channel 110. The pressure tap 260 is connected to the atmosphere through the emergency pipe 630, which is equipped with an emergency pressure relief valve 631.

[0059] The drive unit of the pressure relief pilot valve 600 is connected to the inlet end of the flow channel 110, so the medium pressure of the drive unit is equal to the medium pressure in the inlet end of the flow channel 110. When the medium pressure of the drive unit is less than the set pressure value of the pressure relief pilot valve 600, the inlet and outlet of the pressure relief pilot valve 600 are not connected; when the medium pressure of the drive unit is greater than the set pressure value of the pressure relief pilot valve 600, the inlet and outlet of the pressure relief pilot valve 600 are connected.

[0060] by Figure 6For example, initially, the valve is closed, and the pressurized medium enters the inlet of the flow channel 110. Part of the medium passes through the buffer pipe 430 and the buffer one-way regulating valve 431 into the buffer tank 420, thus acting on the buffer ring 320 at the second end of the piston structure 300. Simultaneously, part of the medium also enters the slot 330 through the guide hole 331. The combined area of ​​the pressure exerted by the medium in the buffer tank 420 and the slot 330 is the annular area A1. Another part of the medium enters the control chamber 240 through the pressure tapping pipe 260, the pressure regulating valve 261, and the first pressure tapping hole 241. The area of ​​the pressure exerted by the medium in the control chamber 240 is the annular area A3. The inlet of the flow channel 110 is connected to the control chamber 240, therefore P1 = P3. Since the pipeline in this embodiment releases pressure to the atmosphere through a hydraulic piston valve, when the hydraulic piston valve is closed, the outlet of the flow channel 110 is directly connected to the atmosphere or only at the height of the water tank, and the pressure P2 at the outlet of the flow channel 110 is almost zero.

[0061] In summary, when the valve is closed, P3=P1 and A3>A1, so the force on the first end of the piston structure 300 is greater than the force on the second end, and the piston structure 300 remains in the sealed connection position between the main sealing ring 310 and the valve seat 410.

[0062] When the pressure in the inlet of the flow channel 110 exceeds the set pressure value of the pressure relief pilot valve 600, the inlet and outlet of the pressure relief pilot valve 600 are connected. That is, the control chamber 240 is connected to the atmosphere through the outlet and the pressure relief pipe 620. The medium pressure P3 in the control chamber 240 decreases. When the medium pressure P3 in the control chamber 240 decreases to the point that the force on the first end of the piston structure 300 is less than the force on the second end, the piston structure 300 and the piston cylinder 360 move in the valve opening direction. The piston structure 300 disengages from the auxiliary valve body 400, the valve opens, and the medium flows into the downstream water pool through the valve.

[0063] When the medium pressure at the inlet of the flow channel 110 drops to within the set pressure value of the pressure relief valve 600, the inlet and outlet are not connected, and the medium pressure P3 in the control chamber 240 increases. When the medium pressure P3 in the control chamber 240 rises to the point that the force on the first end of the piston structure 300 is greater than the force on the second end, the piston structure 300 and the piston cylinder 360 move toward the valve closing direction.

[0064] In an emergency, if the pressure of the medium in the inlet of the flow channel 110 increases and the pressure relief valve 600 fails to operate, the emergency pressure relief valve 631 can be manually or electrically driven to connect the control chamber 240 to the atmosphere through the pressure tapping pipe 260 and the emergency pipe 630, thereby achieving rapid pressure relief and rapid valve opening of the control chamber 240.

[0065] In this embodiment, the speed of the valve closing process can be controlled by the opening degree of the pressure regulating valve 261; a larger opening degree results in a faster speed, and a smaller opening degree results in a slower speed. The speed of the valve opening process can be controlled by the opening degree of the pressure relief regulating valve 621; a larger opening degree results in a faster speed, and a smaller opening degree results in a slower speed.

[0066] It should be noted that, under the same specifications and quantity of pipe diameters and regulating valve sizes, the opening degree of the pressure-sensing regulating valve 261 cannot be greater than the opening degree of the pressure-relieving regulating valve 621; otherwise, the pressure in the control chamber 240 will not change due to the action of the pressure-relieving pilot valve 600.

[0067] Example 3 The hydraulic control valve in this embodiment is used for pressure reduction and stabilization. The pressure reduction and stabilization valve 700 is designed for situations where the upstream pressure is high and there are high pressure fluctuations. By adjusting the pressure reduction and stabilization valve 700, the downstream pressure is kept at a relatively stable low pressure.

[0068] Reference Figure 7 As shown, the second pressure-inlet 242 is connected to the inlet end of the pressure-reducing pilot valve, and the outlet end of the pressure-reducing pilot valve is connected to the outlet end of the flow channel 110. For example, the pressure-reducing pilot valve can be configured as follows: Figure 7 As shown, the outlet end is connected to the secondary valve body 400 through the pressure connecting pipe 710, thereby achieving connection with the water outlet end of the flow channel 110.

[0069] by Figure 7 For example, initially, the valve is in a certain opening state, that is, there is a set opening between the second end of the piston structure 300 and the secondary valve body 400. A medium with pressure P1 enters the inlet end of the flow channel 110, and then flows into the outlet end of the flow channel 110 through the gap between the piston structure 300 and the secondary valve body 400, where the pressure drops to P2. Part of the medium enters the control chamber 240 through the pressure tapping pipe 260, the pressure regulating valve 261, and the first pressure tapping hole 241. The area of ​​the medium pressure action within the control chamber 240 is annular area A3, and the medium pressure within the control chamber 240 is P3.

[0070] The pressure-reducing pilot valve can be set with a set pressure. It adjusts the inlet opening by comparing the set pressure with the outlet pressure. Specifically, the pressure P2 at the outlet of flow channel 110 is equal to the pressure at the outlet of the pressure-reducing pilot valve. When P2 is greater than the set pressure, the pressure-reducing pilot valve reduces the inlet opening, thereby increasing the pressure in the control chamber 240. This causes the piston structure 300 to slide towards the secondary valve body 400, reducing the distance between the second end of the piston structure 300 and the valve seat 410, thus decreasing the medium pressure P2 at the outlet of flow channel 110.

[0071] Conversely, when P2 is less than the set pressure, the pressure-reducing pilot valve will increase the opening at the inlet end, thereby reducing the pressure in the control chamber 240. This causes the piston structure 300 to slide towards the main valve body 100, increasing the distance between the second end of the piston structure 300 and the valve seat 410, and consequently increasing the medium pressure P2 at the outlet end of the flow channel 110. In other words, the pressure-reducing pilot valve compares the downstream pressure with the set pressure, thereby driving the piston structure 300 to slide to open or close the valve, ensuring that the downstream pressure remains stable near the set pressure.

[0072] The above lists three specific embodiments of the hydraulic piston valve of this embodiment. It is conceivable that the hydraulic piston valve of this embodiment is not limited to the application of the above embodiments. Valves on different pipelines in different embodiments can be solenoid valves, and then multiple control functions can be realized by linkage with upstream and downstream pressure, flow or temperature sensors.

[0073] Throughout this specification, references to "implementation method," "partial implementation method," "one implementation method," "another method," "specific method," or "partial method" mean that at least one implementation method or embodiment in this application includes the specific features, structures, materials, or characteristics described in that implementation method or embodiment.

[0074] In this application, numerical ranges are involved. Unless otherwise specified, the numerical ranges mentioned above are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0075] Although illustrative embodiments have been demonstrated and described, those skilled in the art should understand that the above embodiments should not be construed as limiting the present application, and that changes, substitutions and modifications can be made to the embodiments without departing from the spirit, principles and scope of the present application.

Claims

1. A sensitive water hammer proof hydraulic piston valve, characterized in that The utility model provides a valve structure, including: A main valve body; A flow guide body is installed in the main valve body, and a flow channel is formed between the outer peripheral wall of the flow guide body and the inner side wall of the main valve body; The water-facing end of the flow guide body is provided with a flow guide surface, and the backwater end of the flow guide body is provided with a limiting ring groove; A piston structure is slidably installed at the first end of the limiting ring groove and is in sealing connection with the side wall of the limiting ring groove, and the piston structure cooperates with the flow guide body to form a control cavity; A secondary valve body is arranged at the outlet end of the flow channel and is connected with the main valve body; The secondary valve body is provided with a valve seat, the second end of the piston structure is provided with a main sealing ring, and the main sealing ring is in sealing connection with the valve seat to cut off the communication between the inlet end and the outlet end of the flow channel.

2. The sensitive water hammer proof hydraulic piston valve according to claim 1, characterized in that The backwater end of the flow guide body is coaxially provided with an outer cylinder structure and an inner cylinder structure, and the limiting ring groove is formed between the outer cylinder structure and the inner cylinder structure; The first end of the piston structure is slidably installed between the outer cylinder structure and the inner cylinder structure and is in sealing connection with the outer cylinder structure and the inner cylinder structure.

3. The sensitive water hammer proof hydraulic piston valve according to claim 2, characterized in that The first end of the piston structure is provided with a first ring cylinder and a second ring cylinder, the first ring cylinder is in sealing connection with the outer cylinder structure, and the second ring cylinder is in sealing connection with the inner cylinder structure; An elastic member is installed in the control cavity, the elastic member is installed between the outer cylinder structure and the inner cylinder structure, and the two ends of the elastic member are respectively in abutment with the flow guide body and the piston structure.

4. The sensitive water hammer proof hydraulic piston valve according to claim 3, characterized in that The second end of the piston structure is connected with a piston cylinder, and the main sealing ring is arranged between the piston structure and the piston cylinder.

5. The sensitive water hammer proof hydraulic piston valve according to claim 4, characterized in that The outer diameter of the first ring cylinder is greater than the outer diameter of the piston cylinder, and the outer diameter of the piston cylinder is greater than the inner diameter of the second ring cylinder.

6. The sensitive water hammer proof hydraulic piston valve according to claim 1, characterized in that The secondary valve body is provided with a buffer groove, the second end of the piston structure is provided with a buffer ring, and the buffer ring is correspondingly arranged in the buffer groove; when the main sealing ring is in sealing connection with the valve seat, the buffer ring is inserted into the buffer groove; The opening of the buffer groove faces the piston structure, and when the buffer ring is inserted into the buffer groove, the buffer ring is in sealing connection with the groove wall of the buffer groove; The buffer groove is in communication with the water inlet end of the flow channel through a buffer pipe, and the buffer pipe is provided with a buffer one-way regulating valve.

7. The sensitive water hammer proof hydraulic piston valve according to claim 6, characterized in that The second end of the piston structure is further provided with a clamping groove, the clamping groove is arranged on the inner side of the buffer ring, and the clamping groove is used for embedding the valve seat; The piston structure is provided with a flow guide hole, and the flow guide hole is in communication with the clamping groove and the water inlet end of the flow channel.

8. The sensitive water hammer proof hydraulic piston valve according to claim 1, characterized in that The flow guide body is provided with an auxiliary structure, and the auxiliary structure is used for driving the piston structure to move away from the main valve body.

9. The sensitive water hammer proof hydraulic piston valve according to claim 1, characterized in that, The control cavity is in communication with a first pressure introduction hole, the first pressure introduction hole is in communication with the water inlet end of the flow channel through a pressure introduction pipe, and the pressure introduction pipe is provided with a pressure introduction regulating valve.

10. The sensitive water hammer proof hydraulic piston valve according to claim 1, characterized in that, Further including: A valve rod is rotatably arranged in the main valve body around the axis thereof; A rocker arm is sleeved on the valve rod at the first end and is in transmission connection with the valve rod; A connecting rod is hingedly connected with the second end of the rocker arm; A support is installed on the piston structure and is hingedly connected with the connecting rod; The axial rotation of the valve rod drives the rotation of the rocker arm and finally drives the sliding of the piston structure relative to the flow guide body.

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