Novel 16-stage labyrinth type pressure reducing valve

Abstract

The invention provides a novel 16-stage labyrinth type pressure reducing valve, which relates to the technical field of pressure reducing valves, and comprises a labyrinth type valve cage and a valve core, and the valve core is coaxially arranged in the labyrinth type valve cage. A radial 16-stage pressure reduction structure is arranged on the labyrinth type valve cage and used for thoroughly eliminating medium kinetic energy and effectively resisting cavitation. The size of a gap between the valve element and the inner wall of the labyrinth type valve cage is 0.1 mm, so that the adjusting precision and the cavitation resistance are improved. In addition, the adjusting area and the turn-off area on the valve element are arranged separately, and a stellite alloy layer is overlaid on the surface of the sealing face of the valve element. The problems that in the prior art, a valve cage outlet and a valve element are prone to cavitation and scouring are effectively solved, and the service life of the valve under the working conditions of deep adjustment and high differential pressure is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, and more particularly to a novel 16-stage labyrinth pressure reducing valve. Background Technology

[0002] The design operating mode of existing steam pump minimum flow regulating valves is usually a high-inlet, low-outlet flow-closed type. Among them, the radial throttling orifice type valve cage can effectively reduce vibration and eliminate flow velocity kinetic energy, but its technical defects are still obvious: cavitation is still prone to occur at the valve cage outlet, and the flow velocity is fastest at the tangent point between the valve core and the valve cage, which makes the valve core very easy to be damaged.

[0003] In recent years, to meet the demands of the power grid, coal-fired power units have required extensive adjustments, often operating at extremely low loads. Under these conditions, the feedwater pump flow rate cannot meet the demand, necessitating frequent opening of the minimum flow control valve, sometimes for several hours a day. This high-frequency use makes the valve's resistance to cavitation under high differential pressure particularly important, and the originally designed minimum flow control valve can no longer meet this stringent requirement.

[0004] Therefore, how to solve the problem of cavitation erosion of valve core and valve seat caused by frequent use of valves and improve their service life is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned technical problems, a novel 16-stage labyrinth pressure reducing valve is provided. This invention employs a 16-stage pressure-reducing labyrinth valve core, optimizes the valve core clearance to 0.1mm, and overlays an alloy, separating the regulating zone and the shut-off zone.

[0006] To achieve the above objectives, the present invention provides a novel 16-stage labyrinth pressure reducing valve, comprising a labyrinth valve cage and a valve core; The valve core is coaxially disposed inside the labyrinth valve cage, and the labyrinth valve cage is provided with a radial 16-stage pressure reduction structure; a gap is formed between the valve core and the inner wall of the labyrinth valve cage, and the valve core is provided with a valve core sealing surface.

[0007] Furthermore, the number of labyrinthine valve cages is n, and n≥5.

[0008] Furthermore, the labyrinthine valve cage is equipped with three independent radial 16-stage pressure reduction structures.

[0009] Furthermore, the groove depth corresponding to the radial 16-stage pressure reduction structure is 2.5 mm.

[0010] Furthermore, the size of the gap is 0.1 mm.

[0011] Furthermore, the valve core is defined with an adjustment area and a shut-off area, and the adjustment area and the shut-off area are separately arranged on the valve core.

[0012] Furthermore, the valve core is provided with a valve core sealing surface, which is used to cooperate with the valve seat for sealing.

[0013] Furthermore, the valve core sealing surface is overlaid with a Stellite alloy layer.

[0014] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. The present invention provides a novel 16-stage labyrinth pressure reducing valve, which changes the valve cage from a radial 5-stage throttling orifice to a radial 16-stage pressure reducing structure, which can eliminate the kinetic energy of the medium and effectively solve the cavitation problem at the valve cage outlet, thereby improving the overall service life of the regulating valve.

[0015] 2. The present invention provides a novel 16-stage labyrinth pressure reducing valve, which improves the valve's anti-cavitation capability by optimizing the gap between the valve core and the valve cage from 0.25mm to 0.1mm, thereby enhancing the adjustment accuracy.

[0016] 3. The present invention provides a novel 16-stage labyrinth pressure reducing valve, which separates the adjustment zone and the shut-off zone of the valve core and welds Stellite alloy onto the sealing surface of the valve core. This design not only improves the adjustment characteristics of the valve, but also significantly improves the valve core's resistance to erosion and its service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a novel 16-stage labyrinth pressure reducing valve according to the present invention; Figure 2 This is a schematic diagram of the labyrinth valve cage structure of a novel 16-stage labyrinth pressure reducing valve according to the present invention. Figure 3 This is a schematic diagram of the prior art pressure reducing valve structure described in this invention; Figure 4 This is a schematic diagram of the valve core structure of the prior art pressure reducing valve described in this invention.

[0019] In the diagram: 1. Labyrinth valve cage; 2. Valve core; 3. Radial 16-stage pressure reduction structure; 4. Valve core sealing surface; 5. Clearance. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0027] Example like Figures 1 to 4 As shown, the present invention provides a novel 16-stage labyrinth pressure reducing valve, comprising: a labyrinth valve cage 1 and a valve core 2; The valve core 2 is coaxially disposed inside the labyrinth valve cage 1, and the two work together. The core improvement of this embodiment lies in the radial 16-stage pressure-reducing structure 3 provided on the labyrinth valve cage 1. This structure changes the traditional radial 5-stage throttling orifice design, and uses 16-stage labyrinth flow channels to completely eliminate the kinetic energy of the medium, thereby effectively resisting cavitation and solving the problem of cavitation that easily occurs at the valve cage outlet.

[0028] In this embodiment, the number of labyrinthine valve cages 1 can be adjusted according to actual operating conditions, set to n, and n≥5, to meet different flow rate regulation requirements. Simultaneously, to further optimize the flow field distribution, the labyrinthine valve cage 1 can be equipped with three independent radial 16-stage pressure-reducing structures 3. Through multi-channel flow diversion and pressure reduction, the anti-cavitation effect is further improved. Regarding the specific dimensional design of the radial 16-stage pressure-reducing structure 3, its corresponding groove depth is preferably 2.5mm. This dimensional design helps to maximize the consumption of fluid kinetic energy while ensuring flow rate.

[0029] A gap 5 is formed between the valve core 2 and the inner wall of the labyrinth valve cage 1. To improve adjustment accuracy and further enhance cavitation resistance, the size of the gap 5 is optimized from the traditional 0.25mm to 0.1mm in this embodiment. This tiny gap 5, combined with the labyrinth structure, effectively reduces the erosion of the valve components by the fluid.

[0030] The functional areas of the valve core 2 have been specially optimized. The valve core 2 is defined with an adjustment area and a shut-off area, and the adjustment area and the shut-off area are set separately on the valve core 2. This separate design allows the valve to perform optimally when adjusting the flow rate and shutting off, thereby improving the regulating characteristics and service life.

[0031] Furthermore, the valve core 2 is provided with a valve core sealing surface 4, which is used to cooperate with the valve seat to achieve a sealing function. To enhance wear resistance and erosion resistance, a Stellite alloy layer is overlaid on the surface of the valve core sealing surface 4. This improvement in material processing significantly enhances the surface hardness and corrosion resistance of the valve core 2, thereby extending the service life of the entire control valve.

[0032] Specific implementation process of this device: During operation, the valve core 2 is coaxially mounted inside the labyrinth valve cage 1 and moves accordingly, performing corresponding functions using the separately set adjustment or shut-off zones. When flow regulation is required, the high differential pressure medium enters the radial 16-stage pressure reducing structure 3 on the labyrinth valve cage 1. The fluid's kinetic energy is completely eliminated when passing through the 16-stage labyrinth flow channel with a groove depth of 2.5mm. Combined with the optimized 0.1mm gap 5 between the valve core 2 and the inner wall of the valve cage, it effectively resists cavitation while improving regulation accuracy. When shut-off is required, the valve core 2 moves to the closed position, and the valve core sealing surface 4, which is overlaid with Stellite alloy layer, cooperates with the valve seat to achieve a highly wear-resistant seal, thereby extending the valve's service life under frequent opening or extremely low load conditions.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel 16-stage labyrinth pressure reducing valve, characterized in that, include: Labyrinth valve cage and valve core; The valve core is coaxially disposed inside the labyrinth valve cage, and the labyrinth valve cage is provided with a radial 16-stage pressure reduction structure; a gap is formed between the valve core and the inner wall of the labyrinth valve cage, and the valve core is provided with a valve core sealing surface.

2. The novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The number of labyrinthine valve cages is n, and n≥5.

3. The novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The labyrinthine valve cage is equipped with three independent radial 16-stage pressure reduction structures.

4. A novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The groove depth corresponding to the radial 16-stage pressure reduction structure is 2.5 mm.

5. A novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The size of the gap is 0.1 mm.

6. A novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The valve core is defined with an adjustment area and a shut-off area, and the adjustment area and the shut-off area are separately arranged on the valve core.

7. A novel 16-stage labyrinth pressure reducing valve according to claim 1, characterized in that, The valve core is provided with a valve core sealing surface, which is used to cooperate with the valve seat for sealing.

8. A novel 16-stage labyrinth pressure reducing valve according to claim 7, characterized in that, The valve core sealing surface is overlaid with a Stellite alloy layer.

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