One-way non-return device

Abstract

The invention discloses a one-way non-return device which is mainly composed of a body, a main runner, side bays and weir islands, and a plurality of side bays are machined on the two sides of the middle-section main runner and are arranged in an up-down staggered mode or in a horizontally symmetrical mode; a plurality of weir islands are arranged on the two sides of the middle-section main runner, are obliquely arranged and are arranged in an up-and-down staggered manner or in a horizontally symmetrical manner; and fluid in the flow channel can only normally flow in a set single direction and cannot normally flow in an opposite direction.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a one-way non-return device. Background Art

[0002] Gaseous fluids have amazing properties: they have no natural interfaces and are the only substances in nature that have the highest fluidity, the highest compressibility, and the highest expansibility.

[0003] Liquid fluids also possess amazing properties: although extremely soft, they are incompressible and are the only substances in nature with only one natural interface. Moreover, this natural interface is naturally horizontal.

[0004] Under natural conditions, the flow law of gaseous fluids is to flow in the direction of lower pressure; the flow law of liquid fluids must succumb to the force of gravity. As the saying goes, "water flows to the lowest place", it can be seen that the downward flow of liquid fluids is a common phenomenon.

[0005] It is hoped that the properties of these materials can be used to invent, design and manufacture suitable one-way non-return devices to serve mankind.

[0006] Fluids can typically flow in two opposite directions through a flow tube. To restrict flow, a fixed or movable barrier is typically installed. However, a one-way, non-return device, unlike standard flow tubes, lacks any movable barrier. Summary of the Invention

[0007] The present invention provides a one-way non-return device to solve the problem in the prior art that fluid can usually flow in two opposite directions in a flow pipe. If the flow direction needs to be restricted, a fixed or movable blocking component is usually installed.

[0008] On the one hand, the present invention provides a one-way non-return device, which is characterized in that it includes a main body, a main channel, side bays, and a weir island; a number of side bays are processed on both sides of the middle main channel, which are arranged in a staggered manner or in a horizontally symmetrical manner.

[0009] According to a one-way non-return device provided by the present invention, the maximum angle between the shoreline of the side bay and the centerline of the main channel is ≤80 degrees, preferably 10 degrees to 75 degrees.

[0010] According to a one-way non-return device provided by the present invention, there are U-shaped flow channels communicating with each other in the side bay, the flow channel located at the top is the flow channel inside the side bay, and the flow channel located at the bottom is the flow channel outside the side bay.

[0011] According to a one-way non-return device provided by the present invention, the cross section of the body including the main channel and the side bay can be rectangular, circular, annular or other polygonal.

[0012] On the other hand, the present invention also provides a one-way non-return device, including a main body, a main channel, a side bay, and a weir island; the flow cross-sectional area of ​​the upper main channel is larger than the flow cross-sectional area of ​​the lower main channel.

[0013] According to the one-way non-return device provided by the present invention, the flow cross-sectional area of ​​the upper main flow channel may also be equal to or smaller than the flow cross-sectional area of ​​the lower main flow channel.

[0014] On the other hand, the present invention also provides a one-way non-return device, which includes a main body, a main channel, a side bay, and a weir island; a number of weir islands are arranged on both sides of the middle main channel, and the weir islands are arranged obliquely and arranged in an up-down staggered manner or in a horizontally symmetrical manner, preferably in an up-down staggered manner.

[0015] According to a one-way non-return device provided by the present invention, the length of the oblique extension of the weir islands staggered up and down on both sides of the middle main channel exceeds half the width of the main channel, and the positive projections of the oblique extension tail parts of the weir islands staggered up and down on both sides of the main channel overlap with each other.

[0016] According to a one-way non-return device provided by the present invention, the maximum angle between the obliquely arranged weir island and the center line of the main channel is ≤80 degrees, preferably 10 degrees to 75 degrees.

[0017] According to a one-way non-return device provided by the present invention, the flow outlet adopts the vertical height difference of two weir islands staggered up and down to set the vertical flow outlet; the flow outlet can also adopt a horizontal flow outlet, preferably the vertical flow outlet adopts the vertical height difference of two weir islands staggered up and down to set the vertical flow outlet.

[0018] The one-way non-return device provided by the present invention has the following characteristics: (1) The fluid in the flow channel of a one-way non-return device can only flow normally in a single set direction and cannot flow normally in the opposite direction. For example, it can only flow normally from A to B, but cannot flow normally from B to A (reverse flow is restricted) - the flow rate and flow rate in different directions are different; (2) The flow passage in the one-way non-return device is not equipped with any form of movable blocking parts to limit the reverse flow of the fluid or at least limit its flow pattern and flow rate; (3) The higher the flow velocity of the fluid from B to A in the flow channel, the stronger the effect of preventing backflow from B to A. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a cross-sectional view of the structural diagram provided by the present invention; Figure 2 It is a fluid flow principle diagram provided by the present invention; Figure 3 It is a side view provided by the present invention.

[0021] Reference numerals: Serial number: Main body 1, center line of main channel 1-0, main channel 1-1, side bay 1-2, inner flow channel of side bay 1-3, outer flow channel of side bay 1-4, upper bay corner 1-5, lower bay corner 1-6, upper shoreline of side bay 1-7, lower shoreline of side bay 1-8, diversion outlet 1-1-1, backflow pole a, inlet 2, weir island 3, weir tail 3-1, front face 3-3, discard face 3-4, outlet 3-5, outlet 4, cover plate 5. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] The following combination Figure 1-Figure 3 The one-way non-return device of the present invention is described.

[0024] Figure 1 It is a cross-sectional view of the structural diagram provided by the present invention; Figure 2 It is a fluid flow principle diagram provided by the present invention; Figure 3 It is a side view provided by the present invention; For the convenience of explanation and easy understanding, the description is based on the flow of fluid from A to B (forward), while also taking into account the flow from B to A (retrograde).

[0025] Figure 1 、 Figure 2As shown, the body 1 is generally a rectangular three-dimensional body, but can also be a cylindrical or other three-dimensional body. The interior of the body is a hollow flow channel, with a fluid inlet 2 processed at the upper end and a fluid outlet 4 processed at the lower end.

[0026] Figure 1 、 Figure 2 The main channel center line 1-0 shown is a process virtual line, which serves as an orientation reference for the illustrated structure, such as the left side, right side, both sides, upper left, lower right, etc., to facilitate the explanation of the structure and working principle of the device and facilitate understanding of the present invention.

[0027] Figure 2 As shown, the dotted lines of different flow directions: the upper dotted line is the fluid flowing from A to B, which is forward flow; the lower dotted line is the fluid flowing from B to A, which is reverse flow.

[0028] like Figure 1 Figure 2 As shown, the main channel 1-1 inside the main body is a straight channel with a long length.

[0029] If the one-way non-return device is installed vertically, the gravity of the fluid in the main channel 1-1 can be used to increase the effectiveness of the one-way non-return device.

[0030] For ease of presentation, the main channel 1-1 can be divided from top to bottom into three sections: the upper, middle, and lower sections. The upper section, from the inlet 2 or the upper surface of the one-way non-return device to the upper corner 1-5 of the first side bay 1-2, has a smooth inner wall. The middle section, from the upper corner 1-5 of the first side bay 1-2 to the diversion port 1-1-1 or below the last side bay 1-2, has several side bays 1-2 and several weir islands 3 on either side. The lower section, from the diversion port 1-1-1 or below the last side bay 1-2 to the outlet 4 or the lower surface of the one-way non-return device, has a smooth inner wall. The upper and lower sections are significantly shorter than the middle section.

[0031] Each side bay 1-2 of the central main channel contains two upper and lower channels: inner channel 1-3 and outer channel 1-4. The central main channel functions differently from the inner and outer channels 1-3 and 1-4. When fluid flows from A to B, the central main channel acts as a forward carrier, while the inner and outer channels 1-3 and 1-4 have little influence on or influence the fluid's motion. However, when fluid flows in the reverse direction from B to A, the inner and outer channels 1-3 and 1-4, which are not the main channels, play a primary role.

[0032] In terms of the size of the flow cross-sectional area of ​​the main channel, the flow cross-sectional area of ​​the upper main channel is usually larger than the flow cross-sectional area of ​​the middle main channel, and the flow cross-sectional area of ​​the middle main channel is usually larger than the flow cross-sectional area of ​​the lower main channel. There can be both greater fluid pressure and more fluid gravity available. The flow cross-sectional area of ​​the middle main channel does not include the cross-sectional area occupied by the side bays 1-2 on both sides of the middle main channel due to the outward expansion. The flow cross-sectional area of ​​the upper main channel can be equal to or smaller than the flow cross-sectional area of ​​the middle main channel, and the flow cross-sectional area of ​​the middle main channel can also be equal to or smaller than the flow cross-sectional area of ​​the lower main channel; but the preferred technical solution is that the flow cross-sectional area of ​​the upper main channel is larger than the flow cross-sectional area of ​​the middle main channel and the lower main channel.

[0033] Because weir islands 3 on either side of the middle main channel extend obliquely toward the main channel's centerline 1-0, the flow cross-sectional area fluctuates. The fluid flow in the middle main channel is not completely vertical, but rather zigzags left and right. The fluid velocity in the middle main channel also appears to be lower than that in the upper and lower main channels. Therefore, its length is significantly longer than that of the upper and lower main channels, allowing for greater inertia.

[0034] like Figure 1 As shown, side bays 1-2 are structures that can be directly machined onto the main body 1. They are shaped like a soup spoon standing on its side with the handle facing downward. Side bays 1-2 have a certain volume and are arranged on either side of the main channel at a certain angle to the main channel centerline 1-0. The upper portion of side bays 1-2 diverges outward, while the lower portion converges toward the main channel. Therefore, when fluid flows from direction A to direction B (i.e., forward), side bays 1-2 can retain little fluid. However, when fluid flows from direction B to direction A (i.e., retrograde), side bays 1-2 can retain more fluid.

[0035] Side bay 1-2 can be Figure 1 、 Figure 2 As shown, they are arranged in a staggered manner on both sides of the middle main channel, or they can be arranged horizontally symmetrically on both sides of the middle main channel, and are exactly the same from top to bottom and left to right, which is commonly known as "mirror image".

[0036] But the preferred technical solution is of course the side bay 1-2 such as Figure 1 、 Figure 2 As shown, the side bays 1-2 on both sides of the middle main channel are arranged in a staggered manner, that is, when the position of the side bay 1-2 on one side of the middle main channel, for example, the left side, is at a certain height, the position of the side bay 1-2 on the right side should be higher or lower than the position of the side bay 1-2 on the left side. Figure 1 、 Figure 2 The vertically staggered arrangement shown can provide a larger and more reasonable margin for the arrangement of the barrier islands 3. If the barrier islands are arranged horizontally and symmetrically, such advantages cannot be achieved.

[0037] Bay 1-2 is typically composed of two upper and lower shorelines, 1-7 and 1-8, and a countercurrent point, a. When fluid flows from B to A, it moves diagonally upward along the outer channel 1-4 of the bay. At the countercurrent point a, it changes direction and flows diagonally downward along the inner channel 1-3 of the bay, forming a reverse flow.

[0038] The side bay landing line 1-7 is arranged obliquely, and forms a certain angle with the main channel center line 1-0; but the maximum angle is not greater than 80 degrees. The preferred technical solution is that the angle with the main channel center line 1-0 is 20 degrees to 50 degrees.

[0039] Figure 2 The angle shown is merely an optional illustration and does not constitute any limitation on the angle between the side bay shoreline 1-7 and the main channel centerline 1-0. In other words, the angle between the side bay shoreline 1-7 and the main channel centerline 1-0 can be freely selected to an appropriate threshold value as needed to facilitate fluid movement.

[0040] The side bay lower bank line 1-8 is also arranged obliquely. In actual application, the angle between it and the main channel centerline 1-0 is usually slightly larger than the angle between the side bay upper bank line 1-7 and the main channel centerline 1-0; however, the maximum angle is not greater than 80 degrees. The preferred technical solution is to have an angle between it and the main channel centerline 1-0 of 20 to 50 degrees.

[0041] Bay 1-2 is divided by barrier island 3, forming a U-shaped channel: the inner channel 1-3, formed by the upper bay shoreline 1-7 and barrier island 3, flows diagonally downward from above, while the outer channel 1-4, formed by the lower bay shoreline 1-8 and barrier island 3, flows diagonally upward from below. Although the fluid entering these channels is the same, its flow directions are opposite: the flow flowing from diagonally upward along the outer channel 1-4 turns around at the reversal point a and flows diagonally downward from above along the inner channel 1-3.

[0042] The length of the flow channels 1-3 in the side bay is relatively short, usually about half the length of the flow channels 1-4 outside the side bay.

[0043] The flow cross-sectional areas at the upper and lower ends of the side bay flow channel 1-3 are usually equal, but can be different. If they are different, the flow cross-sectional area at the upper end of the side bay flow channel 1-3 is usually larger than the flow cross-sectional area at the lower end, which may result in a certain amount of additional acceleration of the fluid.

[0044] The flow cross-sectional area of ​​the side bay inner flow channel 1-3 is usually smaller than the flow cross-sectional area of ​​the side bay outer flow channel 1-4, but can also be equal to the flow cross-sectional area of ​​the side bay outer flow channel 1-4.

[0045] The cross-sectional areas of the outer channel 1-4 at the upper and lower ends are typically equal, but they can be unequal. If they are unequal, the cross-sectional area of ​​the outer channel 1-4, extending diagonally upward from the lower corner 1-6 of the side bay 1-2, should be larger than the cross-sectional area above. This increases the amount of fluid entering the outer channel 1-4 and also increases the pressure on the inner channel 1-3, thereby enhancing the effectiveness of containing and intercepting reverse flow from B to A.

[0046] In order to prevent the fluid from flowing backward, the surface of the side bay outer flow channel 1-4 is usually an uneven rough surface, but can also be a smooth surface.

[0047] like Figure 1 、 Figure 2 As shown, several weir islands 3 are positioned on either side of the main channel in the middle section. These weir islands 3 are typically rectangular strips, but can be regular, irregular, or other polygonal shapes composed of flat and curved surfaces. Weir islands 3 act as guide plates that divide the flow in side bays 1-2 into two upper and lower side bays. Because their shape and function are similar to the Dujiangyan Weir in Chengdu, China, they are also known as the Li Bing Weir, in honor of this sage's achievements and inspiration for the present invention.

[0048] Yandao 3 can be used as Figure 1 、 Figure 2 As shown, they are arranged in an up-and-down staggered manner along both sides of the middle main channel; they can also be arranged horizontally symmetrically along both sides of the middle main channel (not shown in the figure), and are exactly the same up and down and left and right, which is commonly known as "mirror image".

[0049] But the preferred technical solution is of course the weir island 3 Figure 1 、 Figure 2 As shown, they are arranged in an up and down staggered manner along both sides of the middle main channel, that is, when the position of the weir island 3 on one side of the middle main channel, for example, the left side, is at a certain height, the position of the weir island 3 on the right side of the middle main channel should be higher or lower than the position of the weir island 3 on the left side.

[0050] The weir islands 3 are arranged along both sides of the middle section of the main channel, arranged obliquely, forming a funnel shape: the upper half of the weir islands 3 is inside the side bay 1-2, and the lower half is outside the side bay 1-2, extending obliquely toward the centerline 1-0 of the main channel.

[0051] The lower part of the weir island 3 extending obliquely toward the center line 1-0 of the main channel can be Figure 1 、 Figure 2 The length of the oblique extension shown crosses the centerline of the mid-section main channel, but it does not necessarily need to cross this centerline. "Crossing the centerline of the main channel" means that the oblique extension of the barrier island 3 actually exceeds half (1 / 2) the width of the mid-section main channel, extending to the other side of the centerline. The preferred technical solution is, of course, for the barrier island 3 to extend beyond half (1 / 2) the width of the main channel.

[0052] The lower part of the weir island 3 that extends obliquely beyond half the width of the main channel is usually called the weir tail 3-1, but its shape is like a bird's beak or a fish's mouth, which is relatively smooth and obviously more conducive to the forward flow of the fluid.

[0053] Specifically, on one side of the middle main channel, for example, the length of the weir island 3 on the left side extending to the right exceeds half of the width of the middle main channel, and the length of the weir island 3 on the right side extending to the left also exceeds half of the width of the middle main channel. However, the width of the middle main channel is limited and cannot accommodate the weir islands 3 of the same height on both sides of the middle main channel. Moreover, the lengths of the weir islands 3 extending diagonally each exceed half of the width of the middle main channel, so they have to be staggered up and down, so that the orthographic projections of the tail parts of the weir islands 3 staggered up and down on both sides of the middle main channel that extend diagonally and cross the center line of the middle main channel overlap. The orthographic projection mentioned here is the orthographic projection from top to bottom or from bottom to top. The mutual "overlap" of orthographic projections is actually the mutual "covering" of orthographic projections, which is the structure or structural phenomenon formed by the overlapping orthographic projections of the two staggered weir islands 3 due to their positions. The so-called overlapping of orthographic projections can be understood as the orthographic projection of the upper barrier island 3 “covering” the orthographic projection of the lower barrier island 3 , or the orthographic projection of the upper barrier island 3 being “covered” by the orthographic projection of the lower barrier island 3 .

[0054] The most significant characteristic of the overlapping orthographic projections of the obliquely extending tails of barrier island 3 is that the reverse-flowing flow is blocked by the overlapping portion formed by the upper and lower tails 3-1. This prevents the flow from easily flowing upward through the entire middle main channel. Instead, the flow must change direction at the outlet 3-5 formed by the vertical height difference between the upper and lower sections, turning toward the outer channel 1-4 of the side bay. This demonstrates that the overlapping tails 3-1 of barrier island 3 effectively prevent reverse-flow from flowing upward and entering the one-way non-return device.

[0055] Moreover, the weir islands 3 on both sides of the middle main channel are arranged in an up-down staggered manner, so that the vertical flow outlets 3 - 5 between the upper and lower weir islands 3 can be arranged more reasonably.

[0056] The functional surfaces of barrier island 3 are primarily upper and lower, and they influence the flow pattern and direction of the fluid, influencing its motion. When the fluid flows from A to B (i.e., in the forward direction), the upward surface of barrier island 3 receives the fluid's impact and guides its motion. This surface is called the flow-facing surface (also known as the flow-conducting surface) 3-3, while the downward surface is called the flow-discarding surface (also known as the flow-removing surface or the flow-discharging surface) 3-4. This surface influences the flow pattern of the reverse-flowing fluid.

[0057] The flow-facing surface 3-3 of the weir island 3 is usually a smooth surface, which is conducive to the flow of fluid from A to B; the flow-discarding surface 3-4 is usually an uneven rough surface, but can also be a smooth surface.

[0058] The weir island 3 forms a certain angle with its front surface 3-3 and the main channel centerline 1-0. The maximum angle between the weir island 3 and the main channel centerline 1-0 is no more than 80 degrees. The preferred technical solution is that the angle between the front surface 3-3 and the main channel centerline 1-0 is 20 degrees to 50 degrees.

[0059] Fluid enters the upper main channel from inlet 2 and flows downstream. After passing through the first upper bay 1-5, the fluid enters the middle main channel. Constrained by the long weir island 3, the fluid slides toward the incoming surface 3-3 of the weir island 3 on one side of the middle main channel and continues to flow downward. It is then pushed back to its original side by the incoming surface 3-3 of the weir island 3 on the opposite side of the main channel.

[0060] For forward-flowing fluid, the horizontally symmetrical arrangement of the barrier islands 3 along either side of the mid-main channel generally facilitates fluid flow. However, this horizontally symmetrical arrangement naturally creates a weak zone running from bottom to top around the centerline of the mid-main channel, with no overlapping sections effectively blocking retrograde fluid. For retrograde fluid, especially one with a certain pressure, the horizontally symmetrical arrangement of the barrier islands 3 along either side of the mid-main channel creates a structural resistance that is virtually unusable. Retrograde fluid with a certain pressure can easily break through this weak zone, clearly hindering the flow's ability to prevent backflow.

[0061] The relative weir islands 3 staggered up and down on both sides of the middle main channel form a channel allowing fluid to pass through, which is called a flow outlet.

[0062] If the weir islands 3 are arranged symmetrically on both sides of the center line 1-0 of the middle main channel, the extension length of the two opposite weir islands 3 will not exceed half of the main channel, the flow outlet will be horizontal, and the flow outlet width can be large or small, and the selectivity is usually large.

[0063] Even if they are staggered up and down along both sides of the main channel, the length of the weir islands 3 on both sides does not exceed half of the main channel, so the flow outlet design can be either horizontal or slightly inclined, and the selectivity of the flow outlet width is also relatively large.

[0064] Although an excessively wide horizontal flow port provides better flowability for the forward-flowing fluid, it will affect the backflow prevention effect for the reverse-flowing fluid.

[0065] The flow outlet generally adopts the vertical flow outlet form, that is, the vertical flow outlet 3-5 is set by using the vertical height difference of two weir islands 3 staggered up and down, which corresponds to the reverse flow and will of course have a better anti-backflow effect.

[0066] In short, the flow outlet can be set as a vertical flow outlet with a vertical height difference between two weir islands 3 staggered up and down, or as a horizontal flow outlet; but the preferred technical solution is to set a vertical flow outlet 3-5 with a vertical height difference between two weir islands 3 staggered up and down.

[0067] When the fluid flows forward, the lower limit 3-2 of the vertical point of the weir tail 3-1 is combined with the other weir island 3 on the opposite side to form a flow channel that is usually slightly yawed. The height of the lower limit 3-2 of the vertical point of the weir tail 3-1 may more or less affect the velocity of the fluid in the middle main channel; when the fluid flows backward, the height of the lower limit 3-2 of the vertical point of the weir tail 3-1 may affect the diversion effect.

[0068] Therefore, the lower limit 3-2 of the vertical point of the weir tail 3-1 is usually at the same height as the upper bay corner 1-5 of the side bay 1-2 on the same side of the main channel centerline 1-0, but of course they may not be at the same height; the preferred technical solution is to make the upper bay corner 1-5 at the same height as the lower limit 3-2 of the vertical point of the weir tail 3-1 on the same side.

[0069] like Figure 1 、 Figure 2 As shown, the diversion port 1-1-1 is both a discharge port for the fluid to flow from direction A to direction B (forward) and out of the outlet 4, and a diversion port for the fluid to flow from direction B to direction A (reverse).

[0070] This area has multiple adjacent flow channel openings, including the side bay inner flow channels 1-3, the side bay outer flow channels 1-4, and the middle section main flow channel.

[0071] Figure 2 As shown, the multiple dashed lines at diversion outlet 1-1-1 indicate that when fluid flows in the reverse direction from B to A, it is split by barrier island 3, forming several distinct vertical tributaries. Even the inner channel 1-3 of the side bay may first experience some reverse flow at the diversion outlet. As a result, the vast majority of the fluid is forced to flow upward into the outer channel 1-4 of the side bay, with only a small portion flowing in the reverse direction into the main channel in the middle section.

[0072] The horizontal widths of the flow channels at the diversion port can be equal or unequal. The horizontal width of each flow channel at the diversion port is usually no greater than one-fifth of the horizontal width of the entire diversion port 1-1-1. Therefore, the amount of fluid entering the middle main channel from the diversion port 1-1-1 may be only one-fifth, with most of it being diverted to the side bay flow channel.

[0073] The cover plate 5 is a sealing plate to prevent fluid leakage. If it is processed by 3D printing, it will be more effective in preventing fluid leakage.

[0074] Due to drawing limitations, the cross section of the one-way non-return device is not shown in the figure. In fact, the cross section of the one-way non-return device including the main channel 1-1 and the side bay 1-2 can be rectangular, circular, annular or other polygonal.

[0075] According to the general rules of reading diagrams, the top, bottom, left, right and Figure 2 The various schematic diagrams shown are only for reference to facilitate understanding and do not constitute any limitation.

[0076] How it works 1. Working principle of flow from A to B Figure 1 As can be seen, the two thick arrows A and B represent the direction of fluid movement. The fluid enters the upper main channel from inlet 2, that is, it flows from A to B and from top to bottom, which is called forward flow; When the fluid enters the upper main channel from inlet 2 and flows downward, the fluid with a larger cross-sectional area (flow rate) is constrained by the upper main channel and cannot flow to both sides.

[0077] The fluid continues to flow downward into the middle main channel. Under the flow inertia, the forward fluid flows at an acceleration close to the vertical state. In addition, due to the constraints of the weir islands 3 on both sides, the flow velocity of the fluid may become faster and faster, so it will not enter the side bays 1-2.

[0078] However, if there is residual fluid in the flow channel, it may be squeezed and form turbulent vortexes. Some of the residual fluid is forced to escape from the side bay channel 1-3 and out of the side bay 1-2, joining the fluid in the downstream main channel 1-1. Due to the fluid's wall adhesion and siphon effect, the residual fluid accumulates as it flows downward, inevitably increasing the downward velocity of the fluid. Ultimately, the fluid may be discharged from outlet 4 at a higher velocity than its initial downward velocity.

[0079] 2. Working principle of flow from B to A like Figure 2 As shown, when the fluid enters the lower main channel from the outlet 4, it flows from B to A and from bottom to top, which is called retrograde flow. Figure 2 It can be seen that the reverse flow extreme point a of the fluid in the side bay 1-2 is turned, and the retrograde fluid will turn here and flow out downward from the flow channel 1-3 in the side bay.

[0080] Figure 2 As shown by the multiple dashed lines, when the fluid flows in the reverse direction from direction B to direction A, the upward-flowing fluid is cut and diverted by weir island 3, forming a distinct vertical laminar flow. As a result, the vast majority of the fluid is forced to flow upward into the outer flow channels 1-4 of the side bay, and only a small portion of the reverse-flowing fluid can directly enter the main flow channel in the middle section.

[0081] The combined horizontal width of the flow channel between the left and right weir islands closest to diversion opening 1-1-1 is typically no greater than one-fifth of the entire horizontal width of diversion opening 1-1-1. Most of the fluid entering the lower main channel from outlet 4 is forcibly pushed into the outer channel 1-4 of the left and right side bays 1-2. This means that even if reverse-flow fluid continues to enter the middle main channel from diversion opening 1-1-1, it will only account for approximately one-fifth of the total flow, or even less, because the fluid that turns around and flows out of the side bay inner channel 1-3 from the reverse flow extreme point a will prevent the reverse-flow fluid from entering the middle main channel.

[0082] The retrograde fluid entering the middle main channel continues to ascend. Even if the fluid turning around and flowing out from the reflux pole a in the side bay flow channels 1-3 is added, the amount of fluid entering the middle main channel is still very small and will be diverted again.

[0083] When the retrograde fluid ascends along the side bay outer flow channel 1-4 formed by the weir island 3 and the side bay shoreline 1-8 and reaches the first reverse flow extreme point a, it immediately turns around and flows out along the side bay inner flow channel 1-3, preventing the retrograde fluid from entering the middle main flow channel formed between the left and right weir tails 3-1 closest to the diversion outlet 1-1-1. At this time, the fluid in the side bay outer flow channel 1-4 on the other side has not yet reached the second reverse flow extreme point 2a.

[0084] The smaller amount of fluid that continues to flow backward from diversion port 1-1-1 not only merges with the fluid flowing downward from the inner channel 1-3 of the side bay, resulting in a head-on collision and compression, but also fills the entire space between the reverse flow extreme point a and the reverse flow extreme point 2a. Most of the reverse flow is forcibly diverted into the outer channel 1-4 of the side bay. If it continues to flow upward, it will be forcibly diverted again.

[0085] This process happens again and again, and the amount of retrograde fluid replenished upstream becomes less and less. After multiple diversions, the retrograde fluid is eventually completely blocked.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A one-way non-return device, mainly composed of a main body, a main channel, a side bay, a weir island, etc., characterized by: There are several side bays on both sides of the main channel, which are arranged in a staggered manner or in a horizontally symmetrical manner.

2. A one-way non-return device according to claim 1, characterized in that: The maximum angle between the side bay shoreline and the centerline of the main channel is ≤80 degrees.

3. The one-way non-return device according to claim 1, characterized in that: There are U-shaped flow channels communicating with each other in the side bay, the flow channel located at the upper part is the flow channel inside the side bay, and the flow channel located at the lower part is the flow channel outside the side bay.

4. The one-way non-return device according to claim 1, characterized in that: The cross section of the main body including the main channel and the side bay can be rectangular, circular, annular or other polygonal.

5. A one-way non-return device mainly consists of a main body, a main channel, a side bay, a weir island, etc., characterized by: The flow cross-sectional area of ​​the upper main flow channel is greater than the flow cross-sectional area of ​​the lower main flow channel.

6. The one-way non-return device according to claim 5, characterized in that: The flow cross-sectional area of ​​the upper main flow channel may also be equal to or smaller than the flow cross-sectional area of ​​the lower main flow channel.

7. A one-way non-return device, mainly composed of a main body, a main channel, a side bay, a weir island, etc., characterized by: There are several weir islands on both sides of the main channel. The weir islands are arranged obliquely and in a staggered manner or in a horizontally symmetrical manner.

8. The one-way non-return device according to claim 7, characterized in that: The length of the oblique extension of the weir islands staggered vertically on both sides of the main channel exceeds half of the width of the main channel, and the orthographic projections of the oblique extension tail parts of the weir islands staggered vertically on both sides of the main channel overlap with each other.

9. The one-way non-return device according to claim 7, characterized in that: The maximum angle between the obliquely arranged weir island and the center line of the main channel is ≤80 degrees.

10. The one-way non-return device according to claim 7, characterized in that: The outlet is set up as a vertical outlet with a vertical height difference between two weir islands staggered up and down; the outlet can also be a horizontal outlet.

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