Hydraulic structure of side channel pump body

Abstract

The present invention discloses a hydraulic structure of a side channel pump body, including a side channel, wherein the side channel is a spiral structure, the inlet of the side channel is elliptical, the outlet is circular, the distances from the center of the inlet and the center of the outlet to the spiral center of the side channel are set to R1 and R2 respectively, wherein 2 / 5≤R1 / R2≤3 / 5; the angle between the center of the inlet and the straight line where the spiral center is located and the angle between the center of the outlet and the straight line where the spiral center is located is set to α, wherein 30°≤α≤45°; the outlet is connected to a section of direct current channel, which is tangent to the circle where the spiral of the side channel is located and the connection between the outlet and the direct current channel. The present invention has the advantages of reducing the generation of radial vortex, reducing medium flow loss, and increasing the pumping flow and lift of the side channel pump body.

Description

Technical Field

[0001] The invention relates to the technical field of fluid machinery, and in particular to a hydraulic structure of a side channel pump body. Background Art

[0002] The side channel pump is a radial vane pump between a centrifugal pump and a positive displacement pump. It has the characteristics of small flow and high head. It is suitable for conveying clean media without impurities, particles, and not easy to crystallize, as well as clean media mixed with gas and liquid, etc. The side channel of a traditional side channel pump body is generally an arc-shaped structure. The fluid medium collides with the side channel wall between the arc-shaped side channels and easily generates radial vortices, which increases the flow loss of the medium and thus hinders the flow of the medium, reducing the pumping flow and head of the side channel pump body. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a hydraulic structure of a side channel pump body, which has the advantages of reducing the generation of radial vortexes, reducing medium flow losses, and increasing the pumping flow and lift of the side channel pump body.

[0004] The technical solution adopted by the present invention is:

[0005] A hydraulic structure of a side channel pump body, comprising a side channel, wherein the side channel is a spiral structure, the inlet of the side channel is elliptical and the outlet is circular, the distances from the center of the inlet and the center of the outlet to the spiral center of the side channel are set to R1 and R2 respectively, wherein 2 / 5≤R1 / R2≤3 / 5; the angle between the straight line from the center of the inlet to the spiral center and the straight line from the center of the outlet to the spiral center is set to α, wherein 30°≤α≤45°; the outlet is connected to a section of a straight channel, which is tangent to the circle where the side channel spiral is located and the connection between the outlet and the straight channel.

[0006] The working principle of the present invention is as follows: the side flow channel is in a spiral structure, an impeller is arranged on one side of the side flow channel, the medium enters the side flow channel from the inlet, obtains sufficient kinetic energy under the action of the centrifugal force of the high-speed rotating impeller, the medium accelerates to flow in the spiral side flow channel as the impeller rotates, and the moving medium hits the upper side flow channel along the tangential direction of the impeller when it leaves the impeller. Compared with the traditional arc-shaped flow channel, the spiral side flow channel has a smaller impact angle with the inner wall of the side flow channel, which can reduce the loss of medium flow and the generation of turbulence, and can make the kinetic potential energy of the medium gradually and orderly increase in the side flow channel along the direction of medium movement, thereby increasing the flow rate and lift of the pump body; the inlet is elliptical, and the elliptical structure helps the liquid to have a spatial distance for spiral ascent after the medium passes through the elliptical inlet. And obtain enough energy. At the same time, when the medium is in a gas-liquid mixed state, the elliptical inlet is convenient for the gas with relatively small density to escape upward, which is helpful to improve the transportation efficiency of the gas-liquid mixed medium; the distances from the center of the inlet and the center of the outlet to the spiral center of the side flow channel are set to R1 and R2 respectively, among which 2 / 5≤R1 / R2≤3 / 5. This structure is conducive to retaining a higher flow velocity of the medium while obtaining sufficient pressure potential energy, which helps to increase the head of the pump body. The outlet is connected to a section of straight channel, which is tangent to the circle where the spiral of the side flow channel is located and the connection between the outlet and the straight channel. The straight channel tangent to the side flow channel at the outlet reduces the collision angle between the high-speed medium tangentially separating from the outlet and the inner wall of the side flow channel, which helps to reduce flow losses and allow the medium to smoothly enter the next level of flow channel.

[0007] The flow channel can be a single-sided flow channel or a double-sided flow channel.

[0008] Preferably, an impeller is provided in the side flow channel, and the impeller is provided with straight blades, and the number of the blades is 20-40.

[0009] The working principle of the present invention is: because the side channel pump is a small flow, high head pump, more and denser blades can allow the medium to obtain more sufficient kinetic energy in the impeller, and the number of blades is positively correlated with the diameter of the impeller.

[0010] Preferably, the blade length is set to L, and the radius of the impeller is set to R, wherein 2 / 5≤L / R≤2 / 3.

[0011] The working principle of the present invention is: the impeller is more suitable for conveying media in liquid state. When the impeller radius does not change, the larger the ratio of blade length to impeller radius, the longer the blade. The longer blade can exert sufficient centrifugal force on the liquid medium during high-speed rotation, so that the liquid medium can obtain greater kinetic energy, thereby improving the efficiency of the pump body in pumping the medium.

[0012] Preferably, the blade length is set to L, and the radius of the impeller is set to R, wherein 1 / 8≤L / R≤2 / 7.

[0013] The working principle of the present invention is: the impeller is more suitable for conveying a medium in a gas-liquid mixed state. The medium in a gas-liquid mixed state is more prone to "cavitation" due to the presence of gas, so it is necessary to reduce the "cavitation margin" to reduce the occurrence of "cavitation". In the case where only the blade length is used as a variable, the blades of the above-mentioned impeller become relatively shorter, and the diameter of the medium inlet of the impeller becomes relatively larger. Under the same flow rate, the absolute speed and relative speed of the medium passing through the medium inlet of the impeller are reduced, and the "cavitation margin" is reduced; in the gas-liquid mixed medium, the density of the gas is much lower than that of the liquid, and the centrifugal force generated is also much lower than that of the liquid medium. The vacuum degree generated at the impeller inlet is low, and it is difficult to suck the liquid into the pump. It is easy for the impeller to run idly and cannot convey the liquid, that is, the "gas binding" phenomenon occurs. The shorter blades are suitable for conveying a gas-liquid mixed medium. The gas density is small and escapes upward. The shorter blades can quickly discharge the gas in the medium to avoid the occurrence of the "gas binding" phenomenon.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention has the advantages of reducing the generation of radial vortex, reducing medium flow loss, and increasing the pumping flow and lift of the side channel pump body;

[0016] 2. The impeller of the present invention is provided with dense blades. More and denser blades can allow the medium to obtain more sufficient kinetic energy in the impeller;

[0017] 3. Use an impeller with a ratio of blade length L to impeller radius R of 2 / 5≤L / R≤2 / 3. This impeller is more suitable for liquid media. Longer blades can exert sufficient centrifugal force on the liquid medium during high-speed rotation, so that the liquid medium can obtain greater kinetic energy and improve the efficiency of the pump body in pumping the medium.

[0018] 4. Use an impeller with a ratio of blade length L to impeller radius R of 1 / 8≤L / R≤2 / 7. This impeller is more suitable for conveying gas-liquid mixed media. The gas density is small and it escapes upward. The shorter blades can quickly discharge the gas in the medium to avoid the occurrence of "gas binding" phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a side flow channel of Example 1 of the present invention;

[0020] Figure 2 is a schematic structural diagram of the double-sided flow channels of Example 1 of the present invention;

[0021] Figure 3is a schematic diagram of the axial cross-sectional structure of an impeller suitable for liquid media according to Embodiment 3 of the present invention;

[0022] Figure 4 is an axial view of an impeller suitable for liquid media according to embodiments 2 and 3 of the present invention;

[0023] Figure 5 Schematic diagram of the axial cross-sectional structure of an impeller suitable for gas-liquid mixed medium according to Embodiment 4 of the present invention;

[0024] Figure 6 It is an axial view of an impeller suitable for gas-liquid mixed media according to embodiments 2 and 4 of the present invention.

[0025] Description of reference numerals:

[0026] 1. Side flow channel; 2. Inlet; 3. Outlet; 4. Straight flow channel; 5. Impeller; 6. Blades. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings: Example

[0028] like Figure 1 and Figure 2 As shown, a hydraulic structure of a side channel 1 pump body comprises a side channel 1, wherein the side channel 1 is a spiral structure, the inlet 2 of the side channel 1 is elliptical, and the outlet 3 is circular, and the distances from the center of the inlet 2 and the center of the outlet 3 to the spiral center of the side channel 1 are set to be R1 and R2 respectively, wherein 2 / 5≤R1 / R2≤3 / 5; the angle between the straight line from the center of the inlet 2 to the spiral center and the straight line from the center of the outlet 3 to the spiral center is set to be α, wherein 30°≤α≤45°; the outlet 3 is connected to a section of direct current channel 4, which is tangent to the circle where the spiral of the side channel 1 is located and to the connection between the outlet 3 and the direct current channel 4.

[0029] The flow measuring channel is a single-side flow channel 1.

[0030] The working principle of the present invention is as follows: the side flow channel 1 is in a spiral structure, and an impeller 5 is arranged on one side of the side flow channel 1. The medium enters the side flow channel 1 from the inlet 2, and obtains sufficient kinetic energy under the action of the centrifugal force of the high-speed rotating impeller 5. The medium accelerates in the spiral side flow channel 1 as the impeller 5 rotates. When the moving medium leaves the impeller 5, it hits the side flow channel 1 tangentially along the impeller 5. Compared with the traditional arc-shaped flow channel, the spiral side flow channel 1 has a smaller impact angle with the inner wall of the side flow channel 1, which can reduce the loss of medium flow and the generation of turbulence, and can make the kinetic potential energy of the medium gradually and orderly increase in the side flow channel 1 along the direction of medium movement, thereby increasing the flow rate and lift of the pump body; the inlet 2 is elliptical, and the elliptical structure helps the liquid to have a spatial distance for spiral ascent after the medium passes through the elliptical inlet 2. And obtain enough energy. At the same time, when the medium is in a gas-liquid mixed state, the elliptical inlet 2 is convenient for the gas with relatively small density to escape upward, which is helpful to improve the transportation efficiency of the gas-liquid mixed medium; the distances from the center of the inlet 2 and the center of the outlet 3 to the spiral center of the side channel 1 are set to R1 and R2 respectively, among which 2 / 5≤R1 / R2≤3 / 5. This structure is conducive to retaining a higher flow velocity of the medium while obtaining sufficient pressure potential energy, which is helpful to improve the head of the pump body. The outlet 3 is connected to a section of straight channel 4, which is tangent to the circle where the spiral of the side channel 1 is located and the connection between the outlet 3 and the straight channel 4. The straight channel 4 tangent to the side channel 1 at the outlet 3 reduces the collision angle between the high-speed medium tangentially separating from the outlet 3 and the inner wall of the side channel 1, which helps to reduce flow losses and allow the medium to smoothly enter the next level of the channel. Example

[0031] like Figure 4 and Figure 6 As shown, embodiment 2 is improved on the basis of embodiment 1, and an impeller 5 is provided in the side flow channel 1, and straight blades 6 are provided on the impeller 5, and the number of the blades 6 is 20-40.

[0032] The working principle of the present invention is: because the side channel 1 pump is a small flow, high head pump, more and denser blades 6 can allow the medium to obtain more sufficient kinetic energy in the impeller 5, and the number of blades 6 is positively correlated with the diameter of the impeller 5. Example

[0033] like Figure 3 and Figure 4 As shown, Example 3 is improved on the basis of Example 2, and the length of the blade 6 is set to L, and the radius of the impeller 5 is set to R, wherein 2 / 5≤L / R≤2 / 3.

[0034] The working principle of the present invention is: the impeller 5 is more suitable for conveying a medium in a liquid state. When the radius of the impeller 5 does not change, the larger the ratio of the length of the blade 6 to the radius of the impeller 5, the longer the blade 6. The longer blade 6 can exert sufficient centrifugal force on the liquid medium during high-speed rotation, so that the liquid medium can obtain greater kinetic energy, thereby improving the efficiency of the pump body in pumping the medium. Example

[0035] like Figure 5 and Figure 6 As shown, Example 4 is improved on the basis of Example 2, and the length of the blade 6 is set to L, and the radius of the impeller 5 is set to R, wherein 1 / 8≤L / R≤2 / 7.

[0036] The working principle of the present invention is: the impeller 5 is more suitable for conveying a medium in a gas-liquid mixed state. The gas-liquid mixed medium is more prone to "cavitation" due to the presence of gas, so it is necessary to reduce the "cavitation margin" to reduce the occurrence of "cavitation". In the case where only the length of the blade 6 is used as a variable, the blade 6 of the above-mentioned impeller 5 becomes relatively shorter, and the diameter of the medium inlet of the impeller 5 becomes relatively larger. Then, under the same flow rate, the absolute speed and relative speed of the medium passing through the medium inlet of the impeller 5 are reduced, and the "cavitation margin" is reduced; in the gas-liquid mixed medium, the density of the gas is much lower than that of the liquid, and the centrifugal force generated is also much lower than that of the liquid medium. The vacuum degree generated at the inlet of the impeller 5 is low, and it is difficult to suck the liquid into the pump. It is easy for the impeller 5 to run idly and cannot convey the liquid, that is, the "gas binding" phenomenon occurs. The shorter blade 6 is suitable for conveying a gas-liquid mixed medium, and the gas density is small and escapes upward. The shorter blade 6 can quickly discharge the gas in the medium to avoid the occurrence of the "gas binding" phenomenon.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A hydraulic structure of a side channel pump body, comprising a side channel, characterized in that: The side flow channel is a spiral structure, the inlet of the side flow channel is elliptical and the outlet is circular, and the distances from the center of the inlet and the center of the circle of the outlet to the center of the spiral of the side flow channel are set to R1 and R2 respectively, wherein 2 / 5≤R1 / R2≤3 / 5; the angle between the straight line from the center of the inlet to the center of the spiral and the straight line from the center of the outlet to the center of the spiral is set to α, wherein 30°≤α≤45°; the outlet is connected to a section of direct current channel, which is tangent to the circle where the spiral of the side flow channel is located at the connection between the outlet and the direct current channel.

2. The hydraulic structure of the side channel pump body according to claim 1 is characterized in that: An impeller is arranged in the side flow channel, and straight blades are arranged on the impeller. The number of the blades is 20-40.

3. The side channel pump body-hydraulic structure according to claim 2, characterized in that: The blade length is set to L, and the radius of the impeller is set to R, wherein 2 / 5≤L / R≤2 / 3.

4. The hydraulic structure of the side channel pump body according to claim 2, characterized in that: The blade length is set to L, and the radius of the impeller is set to R, wherein 1 / 8≤L / R≤2 / 7.

Images