Wide-load flow regulating valve

Abstract

The invention relates to the field of valves, in particular to a wide-load flow regulating valve which comprises a valve body, a cage cover, a large valve clack, a small valve clack and a valve rod, the cage cover, the large valve clack and the small valve clack are coaxially nested, and the valve is sequentially driven to act through axial movement of the valve rod; the opening process of the valve is divided into two stages, the initial stroke of the valve rod only drives the small valve clack to be opened, and small flow is accurately adjusted through the small valve clack and an associated structure of the small valve clack; when the valve rod continues to travel, the small valve clack drives the large valve clack to be opened together, and large-flow adjustment is achieved through cooperation of the large valve clack and the cage cover; therefore, the two-stage series adjustment function is achieved in the single valve body, the number of equipment parts and the pipeline work amount needed on site are reduced, and the initial purchase cost and the installation construction cost of the system are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a wide-load flow regulating valve. Background Art

[0002] A flow regulating valve adjusts the flow parameters of the medium (such as steam, gas, liquid, etc.) in the pipeline by changing the flow area of the throttling element inside the valve. In many industrial application scenarios, the process load or the system operating state often needs to vary within a very wide range, which requires the flow regulating valve to be able to adapt to the flow change from 0 to 100%.

[0003] However, for a flow regulating valve with a conventional structure, its flow regulating characteristics often difficult to simultaneously meet the requirements of large flow capacity and precise control of small flow rates. If the flow capacity of the valve is designed to be large to meet the maximum flow demand, the size of the throttling orifice formed by its valve core and valve seat is usually large. When the valve is close to closing and the opening is very small, a small displacement of the valve core may cause a significant change in the flow area and flow rate, resulting in too high a regulation sensitivity under small flow conditions and making it difficult to achieve stable and precise control. On the contrary, if the flow capacity of the valve is designed to be small to optimize the small flow regulation performance, it may not be able to meet the maximum flow required by the system at high loads.

[0004] To address the demand for such a wide-range flow regulation, the commonly adopted method in conventional solutions is to set up a parallel system of large and small valves, such as Figure 1 as shown, that is, one path is provided with a main regulating valve for large flow regulation, and the other path is provided with a bypass regulating valve for small flow regulation in parallel. During system startup or low-load operation, the bypass small valve is used for regulation; when the load increases and a larger flow is required, the main path large valve is switched to for regulation.

[0005] The parallel connection of two valves solves the wide-range regulation problem to a certain extent, but this solution requires two sets of independent regulating valves and their corresponding actuators and control signals, making the structure of the entire flow control unit complex. This not only increases the initial investment cost and maintenance cost of the system, but also occupies a larger installation space and may make the control logic relatively complex. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a wide-load flow regulating valve, which realizes full-range precise and continuous regulation from a small flow rate to the maximum flow rate (such as 0 to 100%) with one valve unit.

[0007] The present invention is achieved by the following technical solutions:

[0008] A wide-load flow regulating valve, comprising:

[0009] A valve body;

[0010] A shroud, which is fixedly arranged in the medium inlet flow channel of the valve body. The lower end of the shroud communicates with the medium outlet flow channel of the valve body, the upper end of the shroud communicates with the medium inlet flow channel, and a large-flow regulating hole for communicating the inside and outside of the shroud is arranged in the lower section of the shroud;

[0011] A large valve disc, which is slidably arranged in the shroud. A large cavity is arranged inside the large valve disc. An outlet hole for communicating the large cavity and the medium outlet channel is arranged at the lower end of the large valve disc. The outer circumferential surface of the large valve disc is slidably and sealingly attached to the inner side surface of the shroud;

[0012] A small valve disc, which is slidably arranged in the large cavity of the large valve disc. A small cavity is arranged inside the small valve disc. The lower end of the small valve disc communicates with the medium outlet flow channel. A small-flow regulating hole for communicating the small cavity and the large cavity is arranged in the lower section of the small valve disc. The outer circumferential surface of the lower section of the small valve disc is slidably and sealingly attached to the inner circumferential surface of the outlet hole. A communication hole for communicating the inside of the shroud and the large cavity is arranged on the large valve disc;

[0013] A valve stem, the lower end of which passes through the upper end surface of the large valve disc and is fixedly connected to the upper end of the small valve disc.

[0014] Specifically, both ends of the shroud are fixedly and sealingly connected to the valve body. A plurality of normally open water inlet holes for communicating the inside of the shroud and the medium inlet flow channel are arranged in the upper section of the shroud.

[0015] Optionally, the large valve disc includes a large valve cylinder and a valve cover. The valve cover is fixedly connected to the upper end of the large valve cylinder. A guiding hole for the valve stem to pass through is arranged on the valve cover. A guiding ring is connected to the upper section of the large valve cylinder. The guiding ring is used for guiding the axial movement of the large valve disc in the shroud;

[0016] When the large valve disc is at the lowermost position, the outer circumferential surface at the lower end of the large valve cylinder blocks all the large-flow regulating holes.

[0017] Optionally, the small valve disc includes a small valve cylinder and a valve column. The upper end of the small valve cylinder is fixedly connected to the lower end surface of the valve column. The upper end surface of the valve column is fixedly connected to the valve stem. The small-flow regulating hole is arranged through the side surface of the small valve cylinder;

[0018] When the small valve disc is at the lowermost position, the small valve cylinder is arranged in the outlet hole, and the inner circumferential surface of the outlet hole blocks all the small-flow regulating holes.

[0019] Optionally, the diameter of the large-flow regulating hole increases sequentially from bottom to top; the diameter of the small-flow regulating hole increases sequentially from top to bottom.

[0020] Optionally, the diameter of the valve stem is greater than the diameter of the small valve barrel. If the diameter of the valve stem is greater than the distance between the communication hole and the central axis of the valve body, an auxiliary communication hole corresponding to the communication hole and penetrating through is provided on the valve stem.

[0021] Optionally, the maximum stroke of the small valve flap is H2. When the small valve flap is at the maximum stroke, the small valve barrel is located above the outlet hole; the maximum stroke of the large valve flap is H1. When the large valve flap is at the maximum stroke, the large valve barrel is arranged above the large flow regulation hole.

[0022] Furthermore, the regulating valve further includes an elastic member, which is arranged between the large valve flap and the small valve flap, and both ends of the elastic member are respectively connected to the lower part of the large valve flap and the upper part of the small valve flap.

[0023] Optionally, the elastic member is a spring, and the spring is always in a compressed state.

[0024] Optionally, the valve stem is in dynamic sealing with the valve body, the valve stem is in dynamic sealing with the valve cover, and the upper end of the valve stem is connected to the actuator.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] The regulating valve provided by the present invention coaxially nests a shroud, a large valve flap, and a small valve flap in a single valve body, and drives the valve to act in sequence through the axial movement of the valve stem; the opening process of the valve is divided into two stages. The initial stroke of the valve stem only drives the small valve flap to open, and the small valve flap and its associated structure are used to achieve precise regulation of small flow; when the valve stem continues to move, the large valve flap is driven by the small valve flap to open together, and the cooperation between the large valve flap and the shroud is used to achieve the regulation of large flow; thus, a two-stage series regulation function is realized in a single valve body, reducing the number of equipment components and the pipeline engineering quantity required on site, and effectively reducing the initial purchase cost and installation construction cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings illustrate exemplary embodiments of the present invention and are used together with the description to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the drawings are included in this specification and form a part of this specification, and do not constitute a limitation on the embodiments of the present invention.

[0028] Figure 1 is a schematic diagram of a conventional solution for wide-range flow regulation according to the present invention.

[0029] Figure 2 is a schematic structural diagram of a wide-load flow regulating valve according to the present invention.

[0030] Figure 3 It is a schematic structural diagram of the large valve flap and the small valve flap according to the present invention.

[0031] Reference numerals: 1 - valve body, 2 - shroud, 3 - small valve flap, 4 - elastic member, 5 - large valve barrel, 6 - guide ring, 7 - valve cover, 8 - valve stem, 9 - water inlet hole, 10 - hollow cavity, 11 - large communication hole, 12 - auxiliary communication hole, 13 - small flow regulating hole. Specific embodiments

[0032] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant content and do not limit the present invention.

[0033] In addition, it should be noted that only the parts related to the present invention are shown in the drawings for the convenience of description.

[0034] In this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

[0037] Embodiment 1

[0038] As Figure 2 and Figure 3As shown in the figure, this embodiment provides a wide-load flow regulating valve, which includes a nested structure of "valve within a valve" inside the valve body 1. By the hierarchical movement of the small valve flap 3 and the large valve flap, the small flow rate and the large flow rate are respectively controlled. The specific structure includes: valve body 1, shroud 2, large valve flap, small valve flap 3 and valve stem 8.

[0039] The valve body 1 is the outermost pressure-bearing housing of the valve, which constitutes the basic channel for the medium to flow through and provides an installation space inside. The structure of the valve body 1 can adopt the common valve body 1 structure at the present stage, only replacing the valve core at the present stage with the combination of the shroud 2 + large valve flap + small valve flap 3 in this embodiment.

[0040] The shroud 2 is usually cylindrical, with a hollow cavity 10 provided inside, and is fixedly arranged in the medium inlet flow channel of the valve body 1. An installation space can be set between the medium inlet flow channel and the medium outlet flow channel, and the shroud 2 is placed in the installation space. The medium flowing in from the medium inlet flow channel can surround the entire shroud 2. The lower end of the shroud 2 is communicated with the medium outlet flow channel of the valve body 1, the upper end of the shroud 2 is communicated with the medium inlet flow channel, and a large-flow regulating hole for communicating the inside and outside of the shroud 2 is provided in the lower section of the shroud 2;

[0041] The large valve flap is slidably arranged inside the shroud 2. A large cavity is provided inside the large valve flap. An outlet hole for communicating the large cavity and the medium outlet channel is provided at the lower end of the large valve flap. The outer circumferential surface of the large valve flap is slidably and sealingly attached to the inner side surface of the shroud 2 to form a sliding seal to prevent the medium from flowing between the outer side surface of the large valve flap and the inner side surface of the shroud 2.

[0042] The small valve flap 3 is slidably arranged inside the large cavity of the large valve flap. A small cavity is provided inside the small valve flap 3. The lower end of the small valve flap 3 is communicated with the medium outlet flow channel. A small-flow regulating hole 13 for communicating the small cavity and the large cavity is provided in the lower section of the small valve flap 3. The outer circumferential surface of the lower section of the small valve flap 3 is slidably and sealingly attached to the inner circumferential surface of the outlet hole. A communication hole for communicating the inside of the shroud 2 and the large cavity is provided on the large valve flap, providing a channel for entering the inner cavity of the large valve flap from the inside of the shroud 2.

[0043] The lower end of the valve stem 8 passes through the upper end surface of the large valve flap and is fixedly connected to the upper end of the small valve flap 3. The upper end of the valve stem 8 is connected to the actuator, and the valve stem 8 is in dynamic seal with the valve body 1. The actuator will drive the valve stem 8 to move up and down, thereby directly controlling the lifting of the small valve flap 3 and indirectly driving the large valve flap to move through the small valve flap 3.

[0044] This regulating valve controls the nested large and small valve flaps inside through a single valve stem 8 to achieve wide-range flow regulation. Its core working logic is as follows: When the valve is opened, the valve stem 8 first only lifts the small valve flap 3, and uses the small valve flap 3 and its associated channels (small flow regulating holes 13, communication holes, etc.) to achieve precise control of micro flow; when a larger flow is required, the valve stem 8 continues to lift, and the small valve flap 3 will drive the large valve flap to lift together, thus opening the main channel (large flow regulating hole) to achieve control of large flow.

[0045] Working principle of small flow regulation:

[0046] Initial state: The valve is in the closed position. The actuator applies a downward thrust through the valve stem 8, so that both the small valve flap 3 and the large valve flap are pressed tightly on their respective valve seats (or sealing surfaces), and the valve is completely closed.

[0047] Open small flow: The actuator drives the valve stem 8 to move upward.

[0048] Priority lifting of small valve flap 3: Since the valve stem 8 is directly connected to the small valve flap 3, the initial upward movement of the valve stem 8 directly drives the small valve flap 3 to lift upward.

[0049] Large valve flap remains closed: The large valve flap remains closed relative to the cage 2, and the large flow regulating hole connecting the inside and outside of the cage 2 is still effectively blocked by the outer ring surface of the large valve flap, and the large flow channel is not opened.

[0050] Formation and regulation of small flow path: The medium enters from the valve medium inlet flow path and flows to the internal space of the cage 2. The medium flows into the large cavity inside the large valve flap through the communication hole opened on the large valve flap. As the small valve flap 3 is lifted, the small flow regulating holes 13 opened at the lower section of it are gradually opened, and the medium flows from the large cavity through these small flow regulating holes 13 into the small cavity. The medium then flows from the small cavity through the lower end of the small valve flap 3 into the valve medium outlet flow path.

[0051] Flow regulation is achieved by lifting the height of the small valve flap 3 by the valve stem 8. The higher the small valve flap 3 is lifted, the larger the effective flow area of the small flow regulating hole 13 is opened, and the larger the small flow allowed to pass through is, realizing precise control of small flow.

[0052] Working principle of large flow regulation:

[0053] Stroke conversion: When the actuator drives the valve stem 8 to continue moving upward and exceeds the predetermined stroke for the small valve flap 3 to regulate small flow alone, the small valve flap 3 will start to drive the large valve flap in a certain way (such as its upper structure contacting the internal structure of the large valve flap).

[0054] Lifting of large valve flap: The small valve flap 3 transmits the upward driving force, causing the large valve flap to leave its valve seat (or sealing surface) on the cage 2 and slide upward.

[0055] Opening and regulation of the large-flow passage: As the large valve flap moves upward, the outer circumferential surface thereof gradually no longer blocks the large-flow regulating holes provided in the lower section of the shroud 2. The main flow passage is opened, and the medium flows in from the medium inlet passage, flows to the outside of the shroud 2, then passes through the opened large-flow regulating holes, enters the inside of the shroud 2, and finally flows downward through the lower end of the shroud 2 and converges into the medium outlet passage of the valve. The higher the large valve flap is lifted, the larger the effective flow area of the large-flow regulating holes exposed (opened), and the larger the large flow allowed to pass through.

[0056] The working core of the wide-load flow regulating valve described in this embodiment lies in using a single valve stem 8 to drive the nested large and small valve flaps 3 to achieve staged flow control. The working principle is as follows: The small valve flap 3 is preferentially lifted by the valve stem 8, and precise small-flow regulation is achieved by using a specific small-flow passage (inside the shroud 2 -> large valve flap communication hole -> large cavity -> small-flow regulating hole 13 -> small cavity -> outlet). At this stage, the large valve flap remains closed; when a larger flow is required, the valve stem 8 continues to lift to drive the large valve flap to open, opening the large-flow regulating holes on the shroud 2 to form the main flow passage (medium inlet passage -> shroud 2 -> large-flow regulating block -> inside the shroud 2 -> outlet), achieving large-flow regulation.

[0057] Embodiment Two

[0058] As Figure 2 and Figure 3 shown, on the basis of Embodiment One, this embodiment further details the specific structural features of the shroud 2, the large valve flap, and the small valve flap 3, and clarifies how the large and small valve flaps achieve fluid blockage in the fully closed state of the valve.

[0059] To ensure the stability of the entire device, the shroud 2 is firmly installed inside the valve body 1, and both ends of the shroud 2 are fixedly and sealedly connected to the valve body 1. A plurality of normally open water inlet holes 9 communicating the inside of the shroud 2 and the medium inlet passage are provided in the upper section of the shroud 2, directly connecting the medium inlet passage with the internal space of the shroud 2, providing an inlet passage for the medium to enter the inside of the large valve flap (when performing small-flow regulation).

[0060] The large valve flap includes a large valve cylinder 5 and a valve cover 7. The valve cover 7 is fixedly and sealedly connected to the upper end of the large valve cylinder 5 by threads. A guiding hole for the valve stem 8 to pass through is provided on the valve cover 7 (ensuring that the valve stem 8 can move up and down stably). The valve stem 8 is in dynamic seal with the valve cover 7. A guiding ring 6 is connected to the upper section of the large valve cylinder 5, and the guiding ring 6 is used to guide the axial movement of the large valve flap inside the shroud 2;

[0061] When the large valve flap is at the lowermost end, the outer circumferential surface at the lower end of the large valve cylinder 5 blocks all the large-flow regulating holes, and the large-flow passage flowing from the outside (inlet side) of the shroud 2 to the inside (outlet side) of the shroud 2 is physically blocked.

[0062] The small valve flap 3 includes a small valve barrel and a valve post. The upper end of the small valve barrel is fixedly connected to the lower end surface of the valve post, the upper end surface of the valve post is fixedly connected to the valve stem 8, and the small flow regulating holes 13 are arranged through the side surface of the small valve barrel.

[0063] When the small valve flap 3 is at the lowest position, the small valve barrel is arranged in the outlet hole, and the inner circumferential surface of the outlet hole blocks all the small flow regulating holes 13. The small flow channel flowing from the large cavity inside the large valve flap to the small cavity inside the small valve flap 3 (and then flowing to the outlet) is physically blocked.

[0064] Two blocking mechanisms in the valve closed state are described: the closing of the large flow is achieved by the outer surface of the valve barrel of the large valve flap blocking the large flow regulating holes on the shroud 2; while the closing of the small flow is achieved by the inner surface of the outlet hole of the large valve flap blocking the small flow regulating holes 13 on the side surface of the valve barrel of the small valve flap 3.

[0065] The diameters of the large flow regulating holes increase successively from bottom to top (i.e., the opening direction of the large valve flap); the diameters of the small flow regulating holes 13 increase successively from top to bottom (i.e., the opening direction of the small valve flap 3). By setting this diameter change, at the beginning of opening, the flow rate is small, and the larger the valve opening, the larger the flow rate. By setting different diameter ratios, the valve can have different regulating behaviors, such as linear characteristics (the flow rate is proportional to the opening), equal percentage characteristics (when the opening changes by one unit, the flow rate changes by the same percentage of the current flow rate), or quick opening characteristics (the flow rate increases rapidly at a small opening), etc.

[0066] The diameter of the valve post is larger than that of the small valve barrel. If the diameter of the valve post is larger than the distance between the communication hole and the central axis of the valve body 1, through auxiliary communication holes 12 corresponding to the communication hole are arranged on the valve post.

[0067] Since the small valve flap 3 moves inside the large valve flap, and small flow needs to enter the large cavity through the communication holes on the large valve flap. If the valve post above the small valve flap 3 is designed to be thick, it may just block these communication holes during upward movement, interrupting the small flow path. To solve this potential problem, corresponding through holes (auxiliary communication holes 12) are directly drilled on the valve post body, so that even when the valve post moves to this position, the medium can still flow through these auxiliary holes and enter the large cavity.

[0068] The maximum stroke of the small valve flap 3 is H2. When the small valve flap 3 is at the maximum stroke, the small valve barrel is located above the outlet hole; when the stroke of the valve stem 8 is between 0 and H2, only the small valve flap 3 moves to perform precise control of the small flow.

[0069] The maximum stroke of the large valve flap is H1. When the large valve flap is at the maximum stroke, the large valve barrel 5 is arranged above the large flow regulating holes. When the stroke of the valve stem 8 is between H2 and H1, only the large valve flap moves to perform precise control of the large flow.

[0070] Finally, the regulating valve further includes an elastic member 4, which is arranged between the large valve flap and the small valve flap 3, and both ends of the elastic member 4 are respectively connected to the lower part of the large valve flap and the upper part of the small valve flap 3. The elastic member 4 is a spring, and the spring is always in a compressed state.

[0071] The spring is designed between the small valve flap 3 and the large valve flap, and the spring is always in a compressed state. During small flow regulation, the stretching force of the spring makes the large valve flap closely fit the sealing surface of the shroud 2, and the medium can only pass through the small flow regulation hole 13; during large flow regulation, the stretching force of the spring fixes the small valve flap 3 to the large valve flap, making the regulation process proceed smoothly; during the entire regulation process, the spring continuously provides a force, which helps to eliminate gaps, reduce vibration, and may help the large and small valve flaps 3 to reliably reset in sequence when the valve stem 8 moves downward to close.

[0072] Embodiment Three

[0073] This embodiment integrates all the structural components described in Embodiment One and Embodiment Two to provide the working process principle of the wide-load flow regulating valve.

[0074] I. Valve closing process:

[0075] When the external actuator drives the valve stem 8 to move downward:

[0076] The valve stem 8 first pushes the small valve flap 3 rigidly connected to it downward. Since the small valve flap 3 is connected to the large valve flap through the elastic member 4, the small valve flap 3 will transmit the thrust downward to the large valve flap, and the large valve flap is pushed to move downward, gradually closing the large flow regulation hole until the outer circumferential surface at the lower end of its large valve barrel 5 completely covers and blocks all the large flow regulation holes opened in the lower section of the shroud 2, cutting off the large flow path.

[0077] Then, continue to apply a force to the small valve flap 3. The small valve flap 3 moves downward and compresses the elastic member 4. The small valve barrel enters the outlet hole at the lower end of the large valve flap and gradually closes the small flow regulation hole 13. When the small valve flap 3 reaches the lowest position, the inner wall of the outlet hole of the large valve flap completely covers and blocks all the small flow regulation holes 13 opened on the side wall of the small valve barrel, cutting off the small flow path.

[0078] At this time, the valve is in a fully closed state.

[0079] II. Valve opening - small flow regulation stage (valve stem 8 stroke 0 - H2):

[0080] When the external actuator drives the valve stem 8 to move upward:

[0081] The valve stem 8 directly lifts the small valve flap 3 connected to it upward.

[0082] Since there is a spring in a compressed state between the large and small valve flaps 3, the spring will stretch (the compression amount will decrease) in the initial stage, but its continuous elastic force is still enough to press the large valve flap down to the sealing position of the cage 2, so that the large valve flap remains closed. Therefore, the large flow regulating hole is still blocked.

[0083] As the small valve flap 3 moves upward, its small valve cylinder slides upward relative to the inner wall of the outlet hole of the large valve flap, thereby gradually exposing the small flow regulating hole 13 on the side wall of the small valve cylinder originally covered by the inner wall of the outlet hole.

[0084] Small flow passage is established: the medium passes through the medium inlet flow channel and enters the cage 2 through the normally open water inlet hole 9 on the upper section of the cage 2. The medium flows through the connecting hole opened on the large valve disc (valve cover 7 part) (if the valve column of the small valve disc 3 is too thick, it may need to pass through the auxiliary connecting hole 12 on it) and enters the large cavity inside the large valve disc. The medium then passes from the large cavity through the gradually opened small flow regulating holes 13 located on the side wall of the small valve cylinder and enters the small cavity inside the small valve disc 3. Finally, the medium passes from the small cavity through the outlet channel directly connected to the lower end of the small valve disc 3 and merges into the medium outlet flow channel of the valve.

[0085] Small flow regulation: The size of the flow depends on the effective flow area exposed by the small flow regulation hole 13 on the side wall of the small valve cylinder. The maximum stroke at this stage is H2. When the small valve disc 3 reaches H2, the small valve cylinder is located above the outlet hole of the large valve disc, and the small flow regulation reaches its maximum.

[0086] 3. Valve opening - large flow adjustment stage (valve stem 8 stroke H2~H1+H2):

[0087] When the valve stem 8 exceeds H2 and continues to move upward:

[0088] The small valve flap 3 contacts the corresponding structure of the large valve flap and starts to drive the large valve flap to move upward.

[0089] The large valve disc slides upward as a whole, and the outer annular surface of the lower end of the large valve cylinder 5 gradually leaves the large flow regulating hole, and begins to expose the large flow regulating hole of the lower section of the cover 2.

[0090] Large flow passage is established: the medium flows through the medium inlet flow channel to the outside of cage 2. The medium passes through the gradually opened large flow regulating holes and enters the inside of cage 2. The medium then flows downward through the lower end of cage 2 and merges into the total medium outlet flow channel of the valve.

[0091] Large flow regulation: The size of the flow mainly depends on the total flow area of the large flow regulation holes opened corresponding to the lifting height of the large valve flap. The maximum stroke of the large valve flap is H1. When the large valve flap reaches H1 (total stroke H1 + H2), its large valve barrel 5 is already located above all the large flow regulation holes, and the large flow channel reaches the maximum opening. During this process, the small flow channel usually remains open as well, but its flow proportion is relatively small.

[0092] Summary of the working process principle:

[0093] For the wide-load flow regulating valve of this embodiment, its working process principle is as follows: Through a single valve stem 8, it controls the nested large and small valve flaps 3 inside and coordinates the springs that are always compressed between the two to achieve orderly and staged flow regulation. When closed, the large and small valve flaps 3 achieve double blockage in sequence through their respective structures (the small flow regulation holes 13 are blocked by the inner wall of the outlet hole of the large valve flap, and the outer wall of the large valve barrel 5 blocks the two large flow regulation holes). When opening, the valve stem 8 first only lifts the small valve flap 3 (stroke 0 - H2), and precisely controls the small flow through the relative movement between its side holes and the outlet hole of the large valve flap (flowing through a specific small path: the water inlet hole 9 of the shroud 2 -> the communication hole of the large valve flap -> the large cavity -> the small flow regulation hole 13 -> the small cavity -> the outlet); when the stroke exceeds H2, the valve stem 8 drives the large and small valve flaps 3 to lift together (stroke H2 to H1 + H2), and controls the large flow by opening the large flow holes on the shroud 2 through the large valve flap (flowing through the main path: the inlet -> outside the shroud 2 -> the large flow regulation hole -> inside the shroud 2 -> the outlet).

[0094] In the description of this specification, the description with reference to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0095] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0096] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications can be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A wide load flow control valve, characterized in that: include: Valve body (1); A cage (2) is fixedly arranged in the medium inlet flow channel of the valve body (1), the lower end of the cage (2) is connected to the medium outlet flow channel of the valve body (1), the upper end of the cage (2) is connected to the medium inlet flow channel, and the lower section of the cage (2) is provided with a large flow regulating hole connecting the inside and the outside of the cage (2); A large valve flap is slidably arranged in the cage (2), a large cavity is arranged inside the large valve flap, an outlet hole connecting the large cavity and the medium outlet channel is arranged at the lower end of the large valve flap, and the outer annular surface of the large valve flap is slidably and sealingly fitted with the inner side surface of the cage (2); A small valve flap (3) is slidably arranged in the large cavity of the large valve flap, a small cavity is arranged inside the small valve flap (3), the lower end of the small valve flap (3) is connected to the medium outlet flow channel, the lower section of the small valve flap (3) is provided with a small flow regulating hole (13) connecting the small cavity and the large cavity, the outer annular surface of the lower section of the small valve flap (3) is slidably sealed with the inner side annular surface of the outlet hole, and the large valve flap is provided with a connecting hole connecting the interior of the cage (2) and the large cavity; The valve stem (8) has a lower end that passes through the upper end surface of the large valve flap and is fixedly connected to the upper end of the small valve flap (3).

2. A wide load flow control valve according to claim 1, characterized in that: Both ends of the cage (2) are fixedly and sealedly connected to the valve body (1), and the upper section of the cage (2) is provided with a plurality of normally open water inlet holes (9) communicating with the interior of the cage (2) and the medium inlet flow channel.

3. A wide load flow control valve according to claim 1, characterized in that: The large valve flap comprises a large valve cylinder (5) and a valve cover (7), the valve cover (7) being fixedly connected to the upper end of the large valve cylinder (5), the valve cover (7) being provided with a guide hole for the valve stem (8) to pass through, the upper section of the large valve cylinder (5) being connected with a guide ring (6), the guide ring (6) being used to guide the axial movement of the large valve flap in the cage (2); When the large valve flap is at the lowest end, the outer annular surface at the lower end of the large valve cylinder (5) blocks all the large flow regulating holes.

4. A wide load flow control valve according to claim 3, characterized in that: The small valve flap (3) comprises a small valve cylinder and a valve column, the upper end of the small valve cylinder is fixedly connected to the lower end surface of the valve column, the upper end surface of the valve column is fixedly connected to the valve stem (8), and the small flow regulating hole (13) is arranged through the side surface of the small valve cylinder; When the small valve flap (3) is at the lowermost end, the small valve cylinder is arranged in the outlet hole, and the inner annular surface of the outlet hole blocks all the small flow regulating holes (13).

5. A wide load flow control valve according to claim 4, characterized in that: The diameter of the large flow regulating hole increases from bottom to top; the diameter of the small flow regulating hole (13) increases from top to bottom.

6. A wide load flow control valve according to claim 4, characterized in that: The diameter of the valve column is larger than the diameter of the small valve cylinder. If the diameter of the valve column is larger than the distance between the connecting hole and the center axis of the valve body (1), the valve column is provided with an auxiliary connecting hole (12) penetrating therethrough corresponding to the connecting hole.

7. A wide load flow control valve according to claim 4, characterized in that: The maximum stroke of the small valve flap (3) is H2. When the small valve flap (3) is at its maximum stroke, the small valve cylinder is located above the outlet hole. The maximum stroke of the large valve flap is H1. When the large valve flap is at its maximum stroke, the large valve cylinder (5) is arranged to be located above the large flow regulating hole.

8. A wide load flow control valve according to claim 1, characterized in that: It also comprises an elastic member (4), wherein the elastic member (4) is arranged between the large valve flap and the small valve flap (3), and the two ends of the elastic member (4) are respectively connected to the lower part of the large valve flap and the upper part of the small valve flap (3).

9. A wide load flow control valve according to claim 8, characterized in that: The elastic member (4) is a spring, and the spring is always in a compressed state.

10. A wide load flow control valve according to claim 3, characterized in that: The valve stem (8) is dynamically sealed with the valve body (1), the valve stem (8) is dynamically sealed with the valve cover (7), and the upper end of the valve stem (8) is connected to an actuator.

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