A valve based on a series structure of a squirrel cage and an orifice plate

Abstract

The present invention discloses a valve based on a series structure of a squirrel cage and an orifice plate, which includes a guide sleeve installed at the top end inside the valve cavity. A first boss is provided at the lower end of the guide sleeve, and a squirrel cage is installed on the first boss. The squirrel cage is of a cylindrical structure and has a plurality of uniformly distributed flow guiding holes on its surface. An orifice plate is provided at the horizontal center line of the outlet end of the valve cavity. The orifice plate has a plurality of through holes on its surface. A diffuser is installed on the right side of the orifice plate. The diffuser is fixed in the right valve seat by an inner hexagonal set screw. The leftmost end of the diffuser presses against the orifice plate and makes the orifice plate closely lean against the right side of the middle valve body. On the basis of not changing the original structure of the valve, the present invention realizes the characteristics of vibration reduction and noise reduction of the valve by adding a series structure of a squirrel cage and an orifice plate. The series orifice plate of the present invention can concentrate the cavitation phenomenon on the orifice plate, avoiding damage to the subsequent system, and has reliable functions, high efficiency, simple structure, convenient manufacturing and easy carrying.

Description

Technical Field

[0001] The present invention relates to the field of vibration reduction and noise reduction structure design under high pressure difference, and more specifically, to a valve based on a series structure of a squirrel cage and an orifice plate. Background Art

[0002] Due to the throttling effect of the valve, pressure fluctuations will be generated when the fluid medium flows in the valve. The unstable flow of the fluid medium is the root cause of flow noise. The copper pipes of the through-hull system will cause elastic deformation under the action of fluid force, and the interaction between the structure and the fluid will generate coupled vibration. The structure vibration radiates noise into the seawater, which is the flow-induced vibration noise. The pipeline of the through-hull system is directly connected to the seawater outside the ship, and the flow noise and flow-induced vibration noise are directly radiated outward through the pipe orifice. Research shows that the flow-induced vibration noise is much smaller than the flow noise. Under high pressure difference conditions, the flow noise is the main noise source of the through-hull system. When treating the noise of the through-hull system, the treatment of the flow noise should be considered first. Therefore, the main goal is to control the flow noise of the regulating valve body.

[0003] The regulating valve has the characteristics of vibration reduction and noise reduction and has been widely used in recent years. However, due to factors such as high pressure difference and high temperature of the liquid medium in the actual use conditions, it is very difficult to achieve the online vibration reduction and noise reduction functions. In order to achieve this function, each manufacturer either starts from the valve's own structure or develops special process equipment. In terms of the valve's own structure, different structures of valves are mostly used as regulating valves. However, due to the influence of the valve's own structure, the reliability decreases, and the adjustment accuracy and flow characteristics are unstable. At the same time, most of the special process equipment has complex structures, difficult manufacturing, and inconvenient operation.

[0004] The series structure of the squirrel cage and the orifice plate means that in the flow channel of "low inlet and high outlet", a squirrel cage structure is added outside the valve core, and an orifice plate structure is added at the outlet. The squirrel cage can play a role in stabilizing the fluid during the opening and closing process of the valve core; the series orifice plate can concentrate the cavitation phenomenon on the orifice plate to avoid damage to the subsequent system. At the same time, this structure can independently disassemble and repair the squirrel cage and the orifice plate, saving time and maintenance costs, and minimizing the losses in production. Its structure is used for the regulating valve of the liquid medium pipeline to regulate the flow rate and pressure of the liquid medium of the regulating valve. Therefore, the quality of its performance directly affects the performance of each system of the whole ship and even the whole ship. Summary of the Invention

[0005] In view of the above problems, the present invention provides a valve based on a series structure of a squirrel cage and an orifice plate, which is simple, reliable, easy to manufacture, and convenient to use, greatly reducing the noise and vibration generated under high pressure difference, preventing the liquid from generating cavitation phenomenon; and playing a role in turbulent flow on the fluid to achieve the vibration reduction and noise reduction functions of the regulating valve.

[0006] To achieve the above object, the present invention provides a valve based on a series structure of a squirrel cage and an orifice plate, which includes a guide sleeve installed at the top end inside the valve cavity. A first boss is provided at the lower end of the guide sleeve, and a squirrel cage is installed on the first boss. The squirrel cage is of a cylindrical structure and has a plurality of uniformly distributed diversion holes on its surface. A second boss is provided at the bottom of the valve cavity, and the lower end of the squirrel cage is sleeved on the second boss.

[0007] An orifice plate is provided at the horizontal center line of the outlet end of the valve cavity. The orifice plate is a convex structure and has a plurality of through holes on its surface. A diffuser is installed on the right side of the orifice plate, and the diffuser is fixed in the right valve seat by an internal hexagonal set screw. The leftmost end of the diffuser presses against the orifice plate and makes the orifice plate closely abut against the right side of the middle valve body.

[0008] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, a groove is formed between the vertical plane in the valve cavity that contacts the guide sleeve and the outer surface of the lower boss of the guide sleeve, and the upper end of the squirrel cage is installed in the groove.

[0009] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, a valve cover is installed above the guide sleeve. The valve cover is provided with flange holes, and the valve cover is bolted to the upper end of the middle valve body through flange bolts and presses the guide sleeve, and the guide sleeve is pressed against the upper end of the squirrel cage.

[0010] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, the convex structure of the orifice plate is a frustum-shaped structure, and a lug is provided at the leftmost edge of the orifice plate, and the lug abuts against the left vertical plane of the middle valve body.

[0011] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, the convex structure of the orifice plate is a hemispherical structure, and a lug is provided at the leftmost edge of the orifice plate, and the lug abuts against the left vertical plane of the middle valve body.

[0012] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, the valve cavity is divided into an upper valve cavity and a lower valve cavity. The guide sleeve is installed at the top end of the upper valve cavity, and the second boss is provided at the bottom of the upper valve cavity. There is a passage between the upper valve cavity and the lower valve cavity, and a valve core is movably installed in the passage.

[0013] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, an inlet end is provided at the left end of the middle valve body. The inlet end is connected to a downwardly inclined flow channel, and the other end of the flow channel is connected to the lower valve cavity. The upper valve cavity is connected to another downwardly inclined flow channel, and the other end of the flow channel is connected to the outlet end at the right end of the middle valve body.

[0014] For the above valve based on the series structure of the squirrel cage and the orifice plate, in a preferred manner, sealing rings are provided at the connections between the left and right ends of the middle valve body and the left and right valve seats.

[0015] The present invention adopts a series muffler method of a squirrel cage and an orifice plate to achieve the effect of vibration reduction and noise reduction. The total pressure drop is dispersed on the regulating valve and the fixed throttling element behind the valve. Without changing the original structure of the valve, the characteristics of vibration reduction and noise reduction of the valve are realized by adding a series structure of a squirrel cage and an orifice plate. The series orifice plate of the present invention can concentrate the cavitation phenomenon on the orifice plate, avoiding damage to the subsequent system. Moreover, the present invention has reliable functions, high efficiency, simple structure, convenient manufacturing and easy carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic diagram of the overall structure of the orifice plate of the present invention in the shape of a cloud platform.

[0017] Figure 2 FIG. is a schematic diagram of the overall structure of the orifice plate of the present invention in the shape of a hemisphere.

[0018] Figure 3 FIG. is a schematic diagram of the semi-sectional overall structure of the squirrel cage of the present invention.

[0019] Figure 4 FIG. is a schematic diagram of the orifice plate structure of the present invention in the shape of a cloud platform.

[0020] In the figure: 1. Squirrel cage, 2. Guide sleeve, 3. Orifice plate, 4. Diffuser, 5. Socket head cap screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] As Figure 1 shown, a valve based on a series structure of a squirrel cage and an orifice plate includes a guide sleeve 2 installed at the top end of the valve cavity, and a first boss is provided at the lower end of the guide sleeve 2.

[0024] As Figure 3 shown, a squirrel cage 1 is installed on the first boss. The squirrel cage 1 is of a cylindrical structure and has a plurality of uniformly distributed diversion holes on its surface.

[0025] As Figure 2As shown, a second boss is provided at the bottom of the valve cavity, and the lower end of the squirrel cage 1 is sleeved on the second boss.

[0026] An orifice plate 3 is provided at the horizontal center line of the outlet end of the valve cavity. The orifice plate 3 is a convex structure, and a plurality of through holes are provided on the surface of the orifice plate 3. A diffuser 4 is installed on the right side of the orifice plate. The diffuser 4 is fixed in the right valve seat by an internal hexagonal set screw 5. The leftmost end of the diffuser 4 presses against the orifice plate 3 and makes the orifice plate 3 closely contact the right side of the middle valve body.

[0027] A groove is formed between the vertical surface in the valve cavity that contacts the guide sleeve 2 and the outer surface of the lower boss of the guide sleeve 2, and the upper end of the squirrel cage 1 is installed in the groove.

[0028] A valve cover is installed above the guide sleeve 2. The valve cover is provided with flange holes. The valve cover is bolted to the upper end of the middle valve body through flange bolts and presses the guide sleeve 2, and the guide sleeve 2 is pressed against the upper end of the squirrel cage 1.

[0029] As Figure 4 shown, the convex structure of the orifice plate 3 is a frustum-shaped structure. A lug is provided at the leftmost edge of the orifice plate 3, and the lug abuts against the vertical plane at the left end of the middle valve body.

[0030] As Figure 2 shown, the convex structure of the orifice plate 3 further includes a hemispherical structure. A lug is provided at the leftmost edge of the orifice plate 3, and the lug abuts against the vertical plane at the left end of the middle valve body.

[0031] The valve cavity is divided into an upper valve cavity and a lower valve cavity. The guide sleeve 2 is installed at the top of the upper valve cavity, and the second boss is provided at the bottom of the upper valve cavity. A passage is provided between the upper valve cavity and the lower valve cavity, and a valve core is movably installed in the passage.

[0032] As Figure 1 shown, an inlet end is provided at the left end of the middle valve body. The inlet end is connected to a downwardly inclined flow channel, and the other end of the flow channel is connected to the lower valve cavity. The upper valve cavity is connected to another downwardly inclined flow channel, and the other end of the flow channel is connected to the outlet end at the right end of the middle valve body.

[0033] Sealing rings are provided at the connections between the left and right ends of the middle valve body and the left and right valve seats.

[0034] Working principle:

[0035] As Figure 1As shown in the figure, the squirrel cage 1 is fixed on the middle flange of the valve body by using the boss in the inner cavity of the valve body and the guide sleeve 2; the squirrel cage 1 makes ingenious use of the limited space between the inner cavity of the valve body and the guide sleeve 2 and is fixed at the center line of the valve cavity; when the valve core opens and closes, the liquid medium will flow outwards through the openings of the squirrel cage 1. After the whole medium diffuses and expands, it diffuses evenly around, thus playing the role of turbulent flow, reducing vibration and further reducing noise. The squirrel cage 1 is just at the center line of the valve cavity. The orifice plate 3 is embedded at the outlet of the valve body. The orifice plate 3 is also at the center line of the valve outlet to ensure uniform force; at the same time, diversion holes are evenly distributed on the outer surface of the squirrel cage 1, and the orifice plate 3 is evenly divergently opened along its surface, so that the liquid medium reduces vibration and noise after expansion and diffusion; the liquid medium after primary noise reduction will flow through the orifice plate 3. The orifice plate 3 allows the liquid medium to flow outwards in a divergent manner through the small holes evenly distributed along its surface. At this time, the bubbles generated when flowing through the squirrel cage 1 are broken again, and cavitation is generated on the outer wall of the orifice plate 3, thus reducing the damage of cavitation to the subsequent system and effectively reducing the generation of noise; the orifice plate 3 is fixed at the outlet end of the valve body through the diffuser 4 and is locked by the hexagon socket head cap screw 5 with a hexagon wrench.

[0036] When maintenance and replacement are needed, the installation process is the reverse, and vice versa.

[0037] The technical solution of the present invention is: a series structure, including two main parts, namely the squirrel cage 1 and the orifice plate 3. The present invention lies in adapting to the characteristics of "throttling, diffusion and expansion". Many symmetric small holes are provided on the sleeve of the squirrel cage 1. When the liquid medium passes through, the noise and vibration generated under high pressure difference can be greatly reduced, and at the same time, cavitation of the liquid can be prevented; a detachable orifice plate 3 is designed at the outlet end of the valve to further play the role of turbulent flow and realize the functions of vibration reduction and noise reduction of the regulating valve.

[0038] The squirrel cage 1 is guided by the groove in the valve body and the boss of the valve cover at the same time and is pressed tightly by the middle flange bolts to eliminate the gaps between the squirrel cage 1 and the valve cover and the valve body; the orifice plate 3 is fixed between the outlet of the valve body and the flange of the right valve seat by tightening and pressing against the diffuser 4 at the outlet end and fastening it with the hexagon socket set screw 5 at the same time.

[0039] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A valve based on a series structure of a squirrel cage and an orifice plate, characterized in that It includes a guide sleeve (2) installed at the top end inside the valve cavity. A first boss is provided at the lower end of the guide sleeve (2), and a squirrel cage (1) is installed on the first boss. The squirrel cage (1) is of a cylindrical structure and has a plurality of evenly distributed diversion holes on its surface. A second boss is provided at the bottom of the valve cavity, and the lower end of the squirrel cage (1) is sleeved on the second boss; At the horizontal center line of the outlet end of the valve cavity, there is an orifice plate (3). The orifice plate (3) is a convex structure and has a plurality of through holes on its surface. A diffuser (4) is installed on the right side of the orifice plate (3). The diffuser (4) is fixed inside the right valve seat by an internal hexagon socket head cap screw (5). The leftmost end of the diffuser (4) presses against the orifice plate (3) and makes the orifice plate (3) closely adhere to the right side of the middle valve body; A groove is formed between the vertical surface in contact with the guide sleeve (2) inside the valve cavity and the outer surface of the boss at the lower end of the guide sleeve (2), and the upper end of the squirrel cage (1) is installed in the groove; A valve cover is installed above the guide sleeve (2). The valve cover is provided with flange holes. The valve cover is screwed to the upper end of the middle valve body by flange bolts and presses the guide sleeve (2), and the guide sleeve (2) is pressed against the upper end of the squirrel cage (1); The valve cavity is divided into an upper valve cavity and a lower valve cavity. The guide sleeve (2) is installed at the top end of the upper valve cavity, and the second boss is arranged at the bottom of the upper valve cavity. There is a passage between the upper valve cavity and the lower valve cavity, and a valve core is movably installed in the passage; The left end of the middle valve body is provided with an inlet end, and the inlet end is connected to a downwardly inclined flow channel. The other end of the flow channel is connected to the lower valve cavity. The upper valve cavity is connected to another downwardly inclined flow channel, and the other end of the flow channel is connected to the outlet end at the right end of the middle valve body.

2. The valve based on the series structure of the squirrel cage and the orifice plate according to claim 1, characterized in that, The convex structure of the orifice plate (3) is a frustum-shaped structure. There are lugs at the leftmost edge of the orifice plate (3), and the lugs abut against the vertical plane at the left end of the middle valve body.

3. The valve based on the series structure of the squirrel cage and the orifice plate according to claim 1, wherein The convex structure of the orifice plate (3) is a hemispherical structure. There are lugs at the leftmost edge of the orifice plate (3), and the lugs abut against the vertical plane at the left end of the middle valve body.

4. The valve based on the series structure of the squirrel cage and the orifice plate according to claim 1, wherein Sealing rings are provided at the joints of the left and right ends of the middle valve body with the left valve seat and the right valve seat.

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