Oscillating jet flow self-priming pump

Abstract

The invention relates to an oscillation jet flow self-priming pump which comprises a pump body and relates to the technical field of water pumps, the pump body is provided with a pump cavity, a water inlet pipe and a self-oscillation nozzle, one end of the self-oscillation nozzle is communicated with the water inlet pipe, the other end of the self-oscillation nozzle is communicated with the pump cavity, and oscillation jet flow is generated when fluid flows in the self-oscillation nozzle. And the gas-liquid mixing speed in the pump cavity is accelerated. The gas-liquid mixing device has the advantages that gas-liquid mixing is rapidly achieved, and the self-suction process is rapid.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to an oscillating jet self-priming pump. Background Art

[0002] In industrial and agricultural production and daily life, self-priming pumps are important equipment for automatically sucking and transporting liquids. Traditional jet-type self-priming pumps achieve self-priming and drainage functions by rotating the impeller at high speed, causing the liquid to acquire kinetic energy and convert it into pressure energy. This type of self-priming pump has many limitations in practical applications. In terms of self-priming speed, the nozzle structure of traditional jet-type self-priming pumps makes it difficult to quickly achieve gas-liquid mixing during startup, resulting in a slow self-priming process and requiring a long time to reach a stable operating state. Publication No. CN204493207U discloses a jet-type self-priming centrifugal pump, and Publication No. CN101644272A discloses a fast self-priming jet-type centrifugal pump. However, both are connected to the water inlet pipe and the pump chamber only by a pipeline. Although this can accelerate self-priming to a certain extent, it cannot meet the actual needs in some situations where time efficiency is high, such as emergency drainage and large-scale rapid irrigation. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, one of the purposes of this application is to provide an oscillating jet self-priming pump, which has the advantages of being able to quickly achieve gas-liquid mixing and a relatively rapid self-priming process.

[0004] The above-mentioned purpose of this application is achieved through the following technical solutions: An oscillating jet self-priming pump includes a pump body, which is provided with a pump chamber, a water inlet pipe and a self-oscillating nozzle. One end of the self-oscillating nozzle is connected to the water inlet pipe, and the other end is connected to the pump chamber. When the fluid flows inside the self-oscillating nozzle, an oscillating jet is generated, which accelerates the gas-liquid mixing speed in the pump chamber.

[0005] In a preferred example, the present application can be further configured as follows: the self-oscillating nozzle includes an inlet flow channel, an inlet throat, a coupling chamber, a feedback flow channel and an outlet flow channel, the outlet of the inlet flow channel is connected to the inlet of the inlet throat, and the outlet of the inlet throat is also connected to the coupling chamber, there are two groups of feedback flow channels and they are symmetrically arranged on both sides of the coupling chamber, one end of the feedback flow channel is connected to the outlet of the inlet throat, and the other end is connected to the coupling chamber, and the outlet of the coupling chamber is connected to the inlet of the outlet flow channel.

[0006] In a preferred example, the present application can be further configured as follows: the outlet flow channel is conical, and the small end is connected to the coupling cavity, the angle of the outlet flow channel is a, and the value of angle a is 80°±2°.

[0007] In a preferred example, the present application can be further configured as follows: the coupling cavity includes a connected cone and a cylindrical portion, the small end of the cone is connected to the outlet of the inlet throat, the angle of the cone is b, and the angle b is 70°±2°.

[0008] In a preferred example, the present application can be further configured as follows: the feedback flow channel includes a connected push flow channel and a feedback diversion flow channel, the push flow channel is connected to the outlet of the inlet throat, and the feedback diversion flow channel is connected to the coupling cavity.

[0009] In a preferred example, the present application can be further configured as follows: assuming the width of the inlet throat is D, the height of the feedback flow channel is H1, the height of the outlet flow channel is H2, the sum of the heights of the outlet flow channel and the feedback flow channel is H3, the sum of the heights of the inlet flow channel and the inlet throat is H4, the minimum width of the coupling cavity is W1, the maximum width of the coupling cavity is W2, the width of the outlet flow channel is W3, the width of the feedback flow channel is W4, and the width of the inlet flow channel is W5, where H1 / D=1.4, H2 / D=1, H3 / D=10, H4 / D=10, W1 / D=1.2, W2 / D=4.2, W3 / D=1.5, W4 / D=1.4, and W5 / D=3.

[0010] The present application has the following advantages: Improved self-priming speed: Compared with traditional jet self-priming pumps, the oscillating jet self-priming pump of the present application can shorten the self-priming time at startup under the same working conditions, can quickly establish a stable liquid delivery channel, and improve work efficiency. It is particularly suitable for liquid delivery scenarios with urgent time requirements, emergency rescue and drainage, etc.; Increased self-priming height: Due to the effective destruction of cavitation initiation, this self-priming pump can meet the needs of complex working conditions such as long-distance water delivery and high-drop liquid delivery, and expand the application scope of self-priming pumps in water conservancy projects, mountain irrigation and other fields. Improved stability and durability: Reducing cavitation not only increases the self-priming height, but also reduces the damage caused by cavitation to the pump body components, extends the service life of the self-priming pump, reduces maintenance costs and downtime, improves the stability and reliability of equipment operation, and brings better user experience and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of this application.

[0012] Figure 2 This is a schematic diagram of the dimensions of this application.

[0013] Figure 3 It is a schematic diagram of the oscillation of this application.

[0014] Figure numerals: 1, inlet flow channel; 2, inlet throat; 3, coupling cavity; 31, cone; 32, cylindrical portion; 4, feedback flow channel; 41, push flow channel; 411, cross flow channel; 412, vertical flow channel; 42, feedback diversion flow channel; 5, outlet flow channel. DETAILED DESCRIPTION

[0015] The present application is further described in detail below with reference to the accompanying drawings.

[0016] Reference Figure 1-Figure 3 , an oscillating jet self-priming pump disclosed in this application, includes a pump body, a pump chamber, a water inlet pipe and a self-oscillating nozzle, one end of the self-oscillating nozzle is connected to the water inlet pipe, and the other end is connected to the pump chamber. When the fluid flows inside the self-oscillating nozzle, an oscillating jet is generated, which accelerates the gas-liquid mixing speed in the pump chamber.

[0017] The self-oscillating nozzle includes an inlet flow channel 1, an inlet throat 2, a coupling chamber 3, a feedback flow channel 4 and an outlet flow channel 5. The outlet of the inlet flow channel 1 is connected to the inlet of the inlet throat 2, and the outlet of the inlet throat 2 is also connected to the coupling chamber 3. There are two groups of feedback flow channels 4 and they are symmetrically arranged on both sides of the coupling chamber 3. One end of the feedback flow channel 4 is connected to the outlet of the inlet throat 2, and the other end is connected to the coupling chamber 3. The outlet of the coupling chamber 3 is connected to the inlet of the outlet flow channel 5.

[0018] The outlet flow channel 5 is conical, and the small end is connected to the coupling chamber 3. The angle of the outlet flow channel 5 is a, and the value of angle a is 80°±2°. The coupling chamber 3 includes a connected cone portion 31 and a cylindrical portion 32. The small end of the cone portion 31 is connected to the outlet of the inlet throat 2. The angle of the cone portion 31 is b, and the value of angle b is 70°±2°.

[0019] The feedback flow channel 4 includes a connected push flow channel 41 and a feedback diverter flow channel 42. In the present embodiment, the push flow channel 41 is a right-angle flow channel, and the feedback diverter flow channel 42 is an arc-shaped flow channel. The right-angle flow channel includes a cross flow channel 411 and a vertical flow channel 412. The cross flow channel 411 is connected to the outlet of the inlet throat 2. The cross flow channel 411 and the vertical flow channel 412 are connected through an arc-shaped transition flow channel. The vertical flow channel 412 is connected to the arc flow channel, and the arc flow channel is connected to the coupling chamber 3. In other embodiments, the feedback diverter flow channel 42 may not be in an arc shape, that is, it allows the water flow in the coupling chamber 3 to generate an oblique diversion and enter the push flow channel 41. The cross flow channel 411 may not be horizontal, and the water flow entering the coupling chamber 3 from the cross flow channel 411 can change the flow direction of the liquid in the coupling chamber 3 to the other side.

[0020] Assume that the width of the inlet throat 2 is D, the height of the feedback flow channel 4 (i.e., the height of the cross flow channel 411) is H1, the height of the outlet flow channel 5 is H2, the sum of the heights of the outlet flow channel 5 and the feedback flow channel 4 is H3, the sum of the heights of the inlet flow channel 1 and the inlet throat 2 is H4, the minimum width of the coupling cavity 3 (i.e., the width of the small end face of the cone 31) is W1, the maximum width of the coupling cavity 3 (i.e., the width of the cylindrical portion 32) is W2, the width of the outlet flow channel 5 (i.e., the width of the small end face of the outlet flow channel 5) is W3, the width of the feedback flow channel 4 (i.e., the width of the vertical flow channel 412) is W4, and the width of the inlet flow channel 1 is W5, where H1 / D=1.4, H2 / D=1, H3 / D=10, H4 / D=10, W1 / D=1.2, W2 / D=4.2, W3 / D=1.5, W4 / D=1.4, and W5 / D=3. Among them, W1-W5 and H1 all represent inner diameters, among which W1 and W3 are the smallest inner diameters.

[0021] The operating principle of this embodiment is as follows: upon startup, the impeller rotates at high speed, and the liquid in the pump body moves toward the impeller outlet under the action of centrifugal force. At this time, the self-oscillating nozzle utilizes the Coanda effect to rapidly mix the oscillating jet ejected from the nozzle with the liquid in the pump. The oscillating jet generates high-frequency turbulence through periodic oscillation. Compared with the stable jet of the original nozzle, this significantly increases the shear force and contact area at the gas-liquid interface. The oscillating jet forms a "stirring-entrainment" cycle within the pump body. The oscillating jet at the nozzle outlet periodically sweeps across the impeller inlet area, forcibly entraining the surrounding liquid for mixing. In contrast, the unidirectional jet of the original nozzle can only passively diffuse, greatly shortening the gas-liquid mixing time and accelerating the self-priming process. During operation, the oscillating jet ejected from the self-oscillating nozzle interferes with the pre-rotation at the impeller inlet, consuming some energy and destroying the conditions for cavitation initiation. Specifically, the oscillating jet changes the flow state and pressure distribution of the fluid, inhibiting the precipitation of gas and the formation of bubbles in the liquid, thereby effectively increasing the self-priming height of the self-priming pump.

[0022] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An oscillating jet self-priming pump, characterized in that: The invention comprises a pump body, on which a pump chamber, a water inlet pipe and a self-oscillating nozzle are provided. One end of the self-oscillating nozzle is connected to the water inlet pipe, and the other end is connected to the pump chamber. When the fluid flows inside the self-oscillating nozzle, an oscillating jet is generated, thereby accelerating the gas-liquid mixing speed in the pump chamber.

2. An oscillating jet self-priming pump according to claim 1, characterized in that: The self-oscillating nozzle comprises an inlet flow channel (1), an inlet throat (2), a coupling chamber (3), a feedback flow channel (4) and an outlet flow channel (5); the outlet of the inlet flow channel (1) is connected to the inlet of the inlet throat (2); the outlet of the inlet throat (2) is also connected to the coupling chamber (3); the feedback flow channel (4) has two groups and is symmetrically arranged on both sides of the coupling chamber (3); one end of the feedback flow channel (4) is connected to the outlet of the inlet throat (2), and the other end is connected to the coupling chamber (3); the outlet of the coupling chamber (3) is connected to the inlet of the outlet flow channel (5).

3. An oscillating jet self-priming pump according to claim 2, characterized in that: The outlet flow channel (5) is tapered, and the small end is connected to the coupling cavity (3). The angle of the outlet flow channel (5) is a, and the value of angle a is 80°±2°.

4. The oscillating jet self-priming pump according to claim 3, characterized in that: The coupling cavity (3) comprises a connected cone portion (31) and a cylindrical portion (32), the small end of the cone portion (31) is connected to the outlet of the inlet throat (2), and the angle b of the cone portion (31) is 70°±2°.

5. The oscillating jet self-priming pump according to claim 4, characterized in that: The feedback flow channel (4) includes a push flow channel (41) and a feedback diversion flow channel (42) that are connected. The push flow channel (41) is connected to the outlet of the inlet throat (2), and the feedback diversion flow channel (42) is connected to the coupling cavity (3).

6. The oscillating jet self-priming pump according to claim 2, characterized in that: Assume that the width of the inlet throat (2) is D, the height of the feedback flow channel (4) is H1, the height of the outlet flow channel (5) is H2, the sum of the heights of the outlet flow channel (5) and the feedback flow channel (4) is H3, the sum of the heights of the inlet flow channel (1) and the inlet throat (2) is H4, the minimum width of the coupling cavity (3) is W1, the maximum width of the coupling cavity (3) is W2, the width of the outlet flow channel (5) is W3, the width of the feedback flow channel (4) is W4, and the width of the inlet flow channel (1) is W5, wherein H1 / D=1.4, H2 / D=1, H3 / D=10, H4 / D=10, W1 / D=1.2, W2 / D=4.2, W3 / D=1.5, W4 / D=1.4, and W5 / D=3.

Images