Multi-runner cavitation Venturi tube

Abstract

The utility model provides a multi-runner cavitation Venturi tube, which belongs to the technical field of pipelines and comprises a tube body, the tube body comprises a medium inlet and a medium outlet, a first runner is arranged at one end, close to the medium inlet, of the tube body, a second runner is arranged at one end, close to the medium outlet, of the tube body, and the first runner is communicated with the second runner. A plurality of venturi flow channels are arranged between the first flow channel and the second flow channel, are communicated with the first flow channel and the second flow channel, and are uniformly arranged along the circumferential direction of the pipe body; according to the utility model, a multi-runner structural design is adopted, so that fluid enters the venturi in a dispersed and balanced manner, the cavitation energy is reduced, and the noise is reduced; meanwhile, due to the multi-runner balance design, mutual interference and offset of vibration are achieved, and the overall vibration amplitude of equipment is reduced; and secondly, compared with a single-flow-channel cavitation Venturi tube and a multi-flow-channel cavitation Venturi tube, the cavitation phenomenon is facilitated, the structure is compact, the weight is light, and the anti-seismic requirement of a pipeline and the design of a supporting structure are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to a multi-channel cavitation venturi tube. Background Art

[0002] The cavitation venturi tube uses the cavitation phenomenon to control flow and pressure. The working principle of the cavitation venturi tube is to allow the fluid to enter from one end and be constrained and decelerated in the venturi tube. After its flow expands to its measured tube diameter, the pressure drops rapidly. When it exceeds a certain value, the liquid will produce steam and bubbles, forming cavitation. The bubbles produced by cavitation carry part of the liquid with it, the pressure rises, the liquid phase is interrupted, the bubbles disappear, and it is in a state of equal pressure. Then bubbles are generated again, and the cycle continues, and finally the liquid flows out from the other end. However, most traditional cavitation venturi tube designs use a single flow channel structure, which is not flexible enough in application. For example, it cannot play the role of diversion and reducing cavitation energy. Utility Model Content

[0003] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide a multi-channel cavitation venturi tube.

[0004] The technical solution adopted by the utility model is as follows: a multi-channel cavitation venturi tube, including a tube body, the tube body including a medium inlet and a medium outlet, the tube body is provided with a first flow channel at one end close to the medium inlet, and a second flow channel at one end close to the medium outlet, a plurality of venturi flow channels are provided between the first flow channel and the second flow channel, the venturi flow channel connects the first flow channel and the second flow channel, and the plurality of venturi flow channels are evenly arranged along the circumference of the tube body.

[0005] The Venturi flow channel includes a contraction portion, a throat portion and an expansion portion. The contraction portion gradually contracts from the first flow channel to the throat portion, the throat portion has the smallest cross-sectional area, and the expansion portion gradually expands from the throat portion to the second flow channel.

[0006] The inner wall of the contraction portion is arc-shaped, and its radius is not less than half of the diameter of the throat portion.

[0007] The expansion portion includes a first expansion section and a second expansion section, the first expansion section and the second expansion section are sequentially arranged along the direction from the throat to the second flow channel, and the taper of the inner wall of the first expansion section is smaller than the taper of the inner wall of the second expansion section.

[0008] A plurality of plates are evenly arranged along the circumferential direction at the connection position between the first expansion section and the second expansion section. The top of the plates is arc-shaped, one end of which gradually inclines toward the inner wall of the first expansion section, and the other end gradually inclines toward the inner wall of the second expansion section.

[0009] The length of the first expansion section is greater than the length of the second expansion section.

[0010] It also includes a mounting tube that is detachably arranged in the tube body, a plurality of the Venturi flow channels are evenly arranged on the mounting tube in the circumferential direction, a limiting ring portion is arranged inwardly near one end of the mounting tube of the second flow channel, and one end of the mounting tube is in contact with the limiting ring portion.

[0011] The taper of the inner wall of the limiting ring portion is the same as the taper of the inner wall of the second expansion section.

[0012] A curved concave surface is arranged on one side of the first flow channel close to the Venturi flow channel, and a starting section of the Venturi flow channel is opened on the curved concave surface.

[0013] The beneficial effects of the utility model are as follows: the utility model adopts a multi-channel structure design, so that the fluid enters the Venturi in a dispersed and balanced manner, reducing cavitation energy and noise; at the same time, the multi-channel balanced design makes the vibrations interfere with each other and cancel each other, reducing the overall vibration amplitude of the equipment; secondly, compared with the single-channel cavitation Venturi, the multi-channel cavitation Venturi tube is conducive to the occurrence of cavitation, and has a more compact structure and lighter weight, which is more beneficial to the seismic requirements of the pipeline and the design of the supporting structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0015] Figure 1 is a cross-sectional view of embodiment 1;

[0016] Figure 2 is a schematic diagram of embodiment 1;

[0017] Figure 3 A cross-sectional view of the Venturi flow channel in Example 1 Figure 1 ;

[0018] Figure 4 A cross-sectional view of the Venturi flow channel in Example 1 Figure 2 ;

[0019] Figure 5 is a cross-sectional view of the second embodiment;

[0020] Figure 6 It is a cross-sectional view of embodiment 3. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] In the description of the present application, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "plurality" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the description of this application, it should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0025] Embodiment 1:

[0026] like Figures 1 to 4As shown, a multi-channel cavitation venturi tube includes a tube body 1, wherein the tube body 1 includes a medium inlet 101 and a medium outlet 102, wherein the tube body 1 is provided with a first channel 2 at one end close to the medium inlet 101, and is provided with a second channel 3 at one end close to the medium outlet 102, wherein a plurality of venturi channels 4 are provided between the first channel 2 and the second channel 3, wherein the venturi channels 4 connect the first channel 2 and the second channel 3, and the plurality of venturi channels 4 are uniformly arranged along the circumference of the tube body 1, and a multi-channel structure design is adopted so that the fluid enters the venturi in a dispersed and balanced manner, thereby reducing the cavitation energy and the noise; at the same time, the multi-channel balance design makes the vibrations interfere with each other and cancel each other, thereby reducing the overall vibration amplitude of the equipment; secondly, compared with the single-channel cavitation venturi, the multi-channel cavitation venturi tube is conducive to the occurrence of cavitation, and has a more compact structure and a lighter weight, which is more favorable to the seismic requirements of the pipeline and the design of the supporting structure.

[0027] The number of the Venturi channels 4 is at least two. In the present embodiment, a balanced design of four Venturi channels 4 is adopted to make the fluid load distribution around the tube body 1 more uniform, which helps to maintain the balance of the tube body, offset the vibrations from interfering with each other, and reduce the overall vibration amplitude of the equipment.

[0028] The Venturi flow channel 4 includes a contraction portion 41, a throat 42 and an expansion portion 43. The contraction portion 41 gradually contracts from the first flow channel 2 to the throat 42. The throat 42 has a minimum cross-sectional area and can accurately control the fluid velocity and pressure flowing through this portion. The key is to prevent cavitation while being able to monitor and adjust the flow rate. The expansion portion 43 gradually expands from the throat 42 to the second flow channel 3. The fluid accelerates when passing through the contraction portion 41 and reaches the highest speed at the throat 42. This process converts pressure energy into kinetic energy, and then partially converts the kinetic energy back into pressure energy in the expansion portion 43, thereby achieving efficient utilization of fluid energy.

[0029] The inner wall of the contraction portion 41 is arc-shaped, and its radius is not less than half the diameter of the throat 42 . The arc-shaped inner wall helps the fluid to transition smoothly. When the arc is not less than half the diameter of the throat 42 , the fluid can flow into the contraction portion 41 more quickly.

[0030] The expansion portion 43 includes a first expansion section 431 and a second expansion section 432, and the first expansion section 431 and the second expansion section 432 are arranged in sequence along the direction from the throat 42 to the second flow channel 3. The taper of the inner wall of the first expansion section 431 is smaller than the taper of the inner wall of the second expansion section 432. By dividing the expansion portion 43 into two sections with different tapers, the pressure recovery process of the fluid can be more finely controlled, making it smoother and more efficient, and it also helps to reduce the noise and vibration generated during the flow of the fluid, thereby improving the stability of the pipeline system.

[0031] A plurality of sheets 401 are evenly arranged along the circumferential direction at the connection position between the first expansion section 431 and the second expansion section 432. The top of the sheet 401 is arc-shaped, with one end gradually tilted toward the inner wall of the first expansion section 431, and the other end gradually tilted toward the inner wall of the second expansion section 432. This not only plays a role in fluid control and optimization of fluid flow direction, but also enhances the structural strength of the expansion part, especially the connection position between the two expansion sections is easily affected by fluid impact.

[0032] The length of the first expansion section 431 is greater than that of the second expansion section 432 . The longer first expansion section 431 allows the fluid to have a longer distance for initial pressure recovery before entering the second expansion section 432 , thereby ensuring that the pressure recovery process is gentle and efficient.

[0033] Embodiment 2:

[0034] like Figure 5 As shown, an improvement is made on the basis of the first embodiment, specifically, it also includes a mounting tube 5 detachably arranged in the tube body 1, and a plurality of the Venturi flow channels 4 are evenly arranged on the mounting tube 5 in the circumferential direction, which facilitates the cleaning and maintenance of the Venturi flow channels 4 and the inside of the tube body 1, and is also convenient for adjusting the number and position of the flow channels according to actual needs to adapt to different working conditions.

[0035] A limiting ring portion 31 is provided inwardly at one end of the second flow channel 3 close to the mounting tube 5, one end of the mounting tube 5 is in contact with the limiting ring portion 31, and the other end can be fixed by a fixing ring that can be threadedly connected to the mounting tube 5, or a ring groove is provided on one side of the first flow channel 2 close to the venturi flow channel 4, and a clamping ring is provided in the ring groove to fix the mounting tube 5. The limiting ring portion 31 can also increase the impact resistance of the mounting tube 5.

[0036] The taper of the inner wall of the limiting ring portion 31 is the same as the taper of the inner wall of the second expansion section 432, which is beneficial to the flow matching when the fluid is converted from the Venturi flow channel 4 to the second flow channel 3, thereby reducing the flow loss.

[0037] Embodiment three:

[0038] like Figure 6 As shown, improvements are made on the basis of Example 1 and / or Example 2. Specifically, an arc-shaped concave surface 201 is provided on the side of the first flow channel 2 close to the Venturi flow channel 4, and the starting section of the Venturi flow channel 4 is opened on the arc-shaped concave surface 201, which reduces the turbulence intensity of the fluid when it enters and improves the stability of the fluid.

[0039] Furthermore, a partition plate 421 is axially arranged on the inner wall of the throat 42. There are at least two partition plates 421 that are evenly arranged circumferentially along the inner wall of the throat 42, which helps to stabilize the fluid when passing through the throat at high speed and reduces flow separation and turbulence. The partition plate 421 is provided with a cutting edge 422 at least on one end facing the first flow channel 2 to avoid blockage in the throat and improve the self-cleaning ability of the pipeline system.

[0040] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A multi-channel cavitation venturi tube, characterized in that: The invention comprises a tube body (1), wherein the tube body (1) comprises a medium inlet (101) and a medium outlet (102); the tube body (1) is provided with a first flow channel (2) at one end close to the medium inlet (101); and a second flow channel (3) is provided at one end close to the medium outlet (102); a plurality of Venturi flow channels (4) are provided between the first flow channel (2) and the second flow channel (3); the Venturi flow channels (4) connect the first flow channel (2) and the second flow channel (3); and the plurality of Venturi flow channels (4) are evenly arranged along the circumference of the tube body (1).

2. A multi-channel cavitation venturi tube according to claim 1, characterized in that: The Venturi flow channel (4) comprises a contraction portion (41), a throat portion (42) and an expansion portion (43), wherein the contraction portion (41) gradually contracts from the first flow channel (2) to the throat portion (42), the throat portion (42) has a minimum cross-sectional area, and the expansion portion (43) gradually expands from the throat portion (42) to the second flow channel (3).

3. A multi-channel cavitation venturi tube according to claim 2, characterized in that: The inner wall of the contraction portion (41) is arc-shaped, and its radius is not less than half the diameter of the throat portion (42).

4. A multi-channel cavitation venturi tube according to claim 2, characterized in that: The expansion portion (43) comprises a first expansion section (431) and a second expansion section (432), the first expansion section (431) and the second expansion section (432) being arranged in sequence along a direction from the throat (42) to the second flow channel (3), the taper of the inner wall of the first expansion section (431) being smaller than the taper of the inner wall of the second expansion section (432).

5. A multi-channel cavitation venturi tube according to claim 4, characterized in that: A plurality of sheets (401) are evenly arranged along the circumferential direction at the connection position between the first expansion section (431) and the second expansion section (432); the top of the sheet (401) is arc-shaped, one end of which gradually inclines toward the inner wall of the first expansion section (431), and the other end of which gradually inclines toward the inner wall of the second expansion section (432).

6. The multi-channel cavitation venturi tube according to claim 4, characterized in that: The length of the first expansion section (431) is greater than the length of the second expansion section (432).

7. The multi-channel cavitation venturi tube according to claim 4, characterized in that: It also includes a mounting tube (5) detachably arranged in the tube body (1), a plurality of the Venturi flow channels (4) being evenly arranged on the mounting tube (5) in the circumferential direction, a limiting ring portion (31) being arranged inwardly at one end of the second flow channel (3) close to the mounting tube (5), and one end of the mounting tube (5) being in contact with the limiting ring portion (31).

8. The multi-channel cavitation venturi tube according to claim 7, characterized in that: The taper of the inner wall of the limiting ring portion (31) is the same as the taper of the inner wall of the second expansion section (432).

9. The multi-channel cavitation venturi tube according to claim 1, characterized in that: A curved concave surface (201) is provided on one side of the first flow channel (2) close to the Venturi flow channel (4), and a starting section of the Venturi flow channel (4) is opened on the curved concave surface (201).

Images