A low-vibration, high-efficiency, compact deep well pump

Abstract

The present invention provides a low-vibration, high-efficiency, compact deep-well pump, whose guide vane structure is installed on the pump casing stage; the guide vane structure consists of positive guide vanes and reverse guide vanes; the cross-sectional projection of the positive guide vanes is a "["-shaped structure, which is composed of a positive guide vane in the suction radial section, a positive guide vane in the axial section, and a positive guide vane in the discharge radial section connected in sequence; a pressure-stabilizing and vibration-reducing structure is provided on the side wall of the pump casing stage corresponding to the positive guide vanes, which includes a first buffer chamber, a flow passage, and a second buffer chamber. The first buffer chamber corresponds to the positive guide vane in the suction radial section and is connected to it through a buffer inlet. The second buffer chamber corresponds to the positive guide vane in the discharge radial section and is connected to it through a buffer outlet. The flow passage connects the first buffer chamber and the second buffer chamber, and the cross-sectional area of ​​the flow passage is a tapered structure along the fluid flow direction; the reverse guide vanes are arranged radially. Due to the improvement of the impeller and guide vane structure, vibration and instability are reduced, thereby improving working performance, efficiency, and compactness.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to a low-vibration, high-efficiency, compact deep well pump. Background Art

[0002] Deep-well pumps are widely used in various industries and are their main energy-consuming equipment. With the growing demand for cost reduction and efficiency improvement, the demand for energy-saving modifications of high-power deep-well pumps is becoming increasingly urgent. The most effective way to save energy is to improve pump efficiency. The design of the pump's impeller and guide vanes is directly related to the pump's efficiency index. Based on experience in flow field analysis, the use of a reasonable guide vane and impeller structure can greatly reduce the pump's hydraulic losses, thereby improving efficiency. In addition, deep-well pumps often have a multi-stage impeller design. Although this can increase the head, it increases the axial length, affecting the aesthetics and compactness of the pump. Optimizing the guide vane and impeller layout can also significantly improve the defects of the pump body structure. Therefore, it is very necessary to optimize the design of the deep-well pump's impeller and guide vanes.

[0003] The prior art CN106194776A discloses a deep well pump with a self-sand discharge structure. The guide vane 3 has a guide vane upper cover plate 5 and a sand-proof tray 6. The guide vane upper cover plate 5 is arranged with sand discharge holes 4. The sand discharge holes 4 are evenly arranged on the guide vane upper cover plate 5. The sand discharge holes 4 are arranged at the minimum axial height of the guide vane upper cover plate, so that solid particles such as gravel deposited due to gravity can be discharged from the pump cavity. The sand-proof tray 6 is arranged between the impeller 2 and the guide vane upper cover plate 5, which can prevent solid particles such as gravel from entering the blade tip gap, thereby improving the reliability and service life of the pump.

[0004] However, the above-mentioned impeller and guide vane structure has design limitations, which only involves the design of some non-universal impeller and guide vane structures, and does not fundamentally change the relevant structure. It has poor adaptability, large flow loss, poor stability, high surge, high noise and low efficiency. Therefore, in response to these problems, the applicant proposes a low-vibration, high-efficiency and compact deep well pump to solve the above-mentioned problems in order to reduce vibration and instability and thus improve working performance, efficiency and compactness. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a low-vibration, high-efficiency and compact deep well pump.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A low-vibration, high-efficiency, compact deep-well pump comprises an inlet section, a pump shaft, an impeller structure, a guide vane structure, and a water outlet section. The two-stage impeller structure and the guide vane structure are connected in series through the pump shaft to form a deep-well pump with a water inlet section and a water outlet section. The impeller structure is mounted on the pump shaft through a key, and the guide vane structure is fixed to the pump shaft through a sleeve and a bearing. The two-stage impeller structure and the guide vane structure are arranged in an overlapping manner. The pump is characterized in that the guide vane structure is mounted on the pump casing stage section; the guide vane structure consists of positive guide vanes and reverse guide vanes; the positive guide vanes are arranged along the axial direction, and include a positive guide vane inlet cover plate, a positive guide vane outlet cover plate, and positive guide vanes. The cross-sectional projection of the positive guide vanes is a "["-shaped structure, which consists of a positive guide vane in the suction radial section, The positive guide vanes of the axial section and the positive guide vanes of the discharge radial section are connected in sequence; a pressure stabilizing and vibration reducing structure is provided on the side wall of the pump casing stage corresponding to the positive guide vanes, which includes a first buffer chamber, a flow passage, and a second buffer chamber. The first buffer chamber corresponds to the positive guide vanes of the suction radial section and is connected through a buffer inlet. The second buffer chamber corresponds to the positive guide vanes of the discharge radial section and is connected through a buffer outlet. The flow passage connects the first buffer chamber and the second buffer chamber, and the cross-section of the flow passage is a tapered structure along the fluid flow direction; the reverse guide vanes are arranged radially, and include reverse guide vanes and a reverse guide vane rear cover plate. The radial outer end of the reverse guide vane rear cover plate is installed corresponding to the axial section positive guide vane, and there is a micro flow gap between the two.

[0008] Furthermore, the impeller structure includes impeller back blades and impeller cover blades. A first annular groove is provided on the outer side of the anti-guide vane rear cover plate. The impeller back blade extends axially into the first annular groove. A boost hole is provided at the bottom of the first annular groove and passes through the anti-guide vane rear cover plate.

[0009] Furthermore, a second annular groove is provided on the outer side of the pump casing stage, and the impeller cover blades extend axially into the second annular groove.

[0010] Furthermore, the angle formed by the center line of the boost hole and the central axis of the pump is an acute angle.

[0011] Furthermore, the angle is 35° to 45°.

[0012] Furthermore, the first buffer cavity is equal to the axial length of the positive guide vane of the suction radial section, the second buffer cavity is equal to the axial length of the positive guide vane of the discharge radial section, and the flow passage is equal to the axial length of the positive guide vane of the axial section.

[0013] Furthermore, the positive guide vanes of the suction radial section, the positive guide vanes of the discharge radial section, and the reverse guide vanes are all three-dimensional twisted space blades.

[0014] Furthermore, the positive guide vanes in the axial section are straight plate type blades.

[0015] Furthermore, a positive guide vane inlet cover plate annular groove is provided on the flow channel side of the positive guide vane inlet cover plate, and the radial width of the positive guide vane inlet cover plate annular groove is smaller than the radial width of the positive guide vane inlet cover plate.

[0016] Furthermore, a positive guide vane outlet cover plate annular groove is provided on the flow channel side of the positive guide vane outlet cover plate.

[0017] Furthermore, the radial width of the positive guide vane outlet cover plate annular groove is greater than the radial width of the positive guide vane inlet cover plate annular groove, and the axial depth of the positive guide vane outlet cover plate annular groove is greater than the axial depth of the positive guide vane inlet cover plate annular groove.

[0018] Furthermore, the buffer inlet is a flow channel with a constant cross section, and the buffer outlet is a jet flow channel that gradually contracts along the flow direction of the fluid.

[0019] The present invention provides a low-vibration, high-efficiency, compact deep-well pump, whose guide vane structure is installed on the pump casing stage; the guide vane structure consists of positive guide vanes and reverse guide vanes; the positive guide vanes are arranged along the axial direction, and include a positive guide vane inlet cover plate, a positive guide vane outlet cover plate, and positive guide vanes, and the cross-sectional projection of the positive guide vanes is a "["-shaped structure, which is composed of a positive guide vane in the suction radial section, a positive guide vane in the axial section, and a positive guide vane in the discharge radial section connected in sequence; a pressure stabilizing and vibration reducing structure is provided on the side wall of the pump casing stage corresponding to the positive guide vane, and includes a first buffer chamber, a flow channel, and a second buffer chamber, the first buffer chamber corresponds to the positive guide vane in the suction radial section and is connected through a buffer inlet, the second buffer chamber corresponds to the positive guide vane in the discharge radial section and is connected through a buffer outlet, the flow channel connects the first buffer chamber and the second buffer chamber, and the cross-section of the flow channel is a tapered structure along the fluid flow direction; the reverse guide vanes are arranged along the radial direction, and include reverse guide vanes and a reverse guide vane rear cover plate, and the radial outer end of the reverse guide vane rear cover plate is installed corresponding to the positive guide vane in the axial section, and there is a micro-flow gap between the two. Improvements to the impeller and guide vane structure reduce vibration and instability, thereby improving operating performance, efficiency and compactness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the axial cross-section structure of a deep well pump in the prior art;

[0021] Figure 2 The improved structure of the impeller and guide vane in the present invention;

[0022] Figure 3 It is a schematic enlarged structure of the positive guide vane and the pressure stabilizing and vibration reducing structure.

[0023] In the figure: water inlet section 1, pump shaft 2, impeller structure 3, impeller back blades 31, impeller cover blades 32, guide vane structure 4, water outlet section 5, key 6, sleeve 7, bearing 8, pump casing stage section 9, positive guide vanes 10, reverse guide vanes 11, pressure stabilizing and vibration reducing structure 12, positive guide vanes 13, second annular groove 91, positive guide vane inlet cover plate 101, positive guide vane outlet cover plate 102, positive guide vane inlet cover plate annular groove 103, positive guide vane outlet cover plate annular groove 104, reverse guide vane 111, reverse guide vane back cover plate 112, first annular groove 113, supercharging hole 114, first buffer cavity 121, flow channel 123, second buffer cavity 122, buffer inlet 124, buffer outlet 125, suction radial section positive guide vanes 131, axial section positive guide vanes 132, discharge radial section positive guide vanes 133. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] The present invention will be described in further detail below with reference to the accompanying drawings.

[0026] like Figure 1-3As shown, a low-vibration, high-efficiency, compact deep-well pump comprises an inlet section 1, a pump shaft 2, an impeller structure 3, a guide vane structure 4, and a water outlet section 5. The two-stage impeller structure 3 and the guide vane structure 4 are connected in series with a water inlet section 1 and a water outlet section 5 through the pump shaft 2 to form a deep-well pump; the impeller structure 3 is mounted on the pump shaft 2 through a key 6, and the guide vane structure 4 is fixed to the pump shaft 2 through a sleeve 7 and a bearing 8. The two-stage impeller structure 3 and the guide vane structure 4 are arranged in an overlapping manner; it is characterized in that: the guide vane structure 4 is mounted on the pump casing stage section 9; the guide vane structure 4 consists of a positive guide vane 10 and a reverse guide vane 11; the positive guide vane 10 is arranged along the axial direction, and includes a positive guide vane inlet cover plate 101, a positive guide vane outlet cover plate 102, and a positive guide vane 13. The cross-sectional projection of the positive guide vane 13 is a "["-shaped structure, which consists of a suction radial section positive guide vane 131, an axial section positive guide vane 132, The positive guide vanes 133 of the discharge radial section are connected in sequence; a pressure stabilizing and vibration reducing structure 12 is provided on the side wall of the pump casing stage 9 corresponding to the positive guide vanes 13, which includes a first buffer chamber 121, a flow channel 123, and a second buffer chamber 122. The first buffer chamber 121 corresponds to the positive guide vane 131 of the suction radial section and is connected to it through a buffer inlet 124. The second buffer chamber 122 corresponds to the positive guide vane 133 of the discharge radial section and is connected to it through a buffer outlet 125. The flow channel 123 connects the first buffer chamber 121 and the second buffer chamber 122. The cross-section of the flow channel 123 is a tapered structure along the fluid flow direction; the reverse guide vane 11 is arranged radially, and includes a reverse guide vane 111 and a reverse guide vane rear cover plate 112. The radial outer end of the reverse guide vane rear cover plate 112 is installed corresponding to the axial section positive guide vane 132, and there is a micro flow gap between the two.

[0027] The shape and structure of the impeller and guide vanes significantly affect the fluid dynamics efficiency. The geometric characteristics of the impeller and guide vanes will cause the distribution of the relative velocity of the fluid, affect the distribution of the flow state, and ultimately affect the loss and efficiency caused by vibration noise. The impeller guide vane structure in this application is different from the conventional impeller guide vanes in the prior art. In response to the above problems, the applicant optimized the design of the impeller guide vane structure and adopted positive guide vanes 10, reverse guide vanes 11 and pressure stabilizing and vibration reduction structure 12. The above structure accelerates the movement of the fluid, reduces the residence time of the fluid in the impeller guide vanes, and reduces the impact of surge noise, etc.; thereby improving the operating performance, efficiency and compactness.

[0028] Furthermore, the impeller structure 3 includes an impeller back blade 31 and an impeller cover blade 32. A first annular groove 113 is provided on the outer side of the anti-guide vane rear cover plate 112. The impeller back blade 31 penetrates into the first annular groove 113 along the axial direction. A boost hole 114 is provided at the bottom of the first annular groove 113 and penetrates the anti-guide vane rear cover plate 112.

[0029] Furthermore, a second annular groove 91 is provided on the outer side of the pump casing stage 9 , and the impeller cover blades 32 extend deep into the second annular groove 91 along the axial direction.

[0030] Furthermore, the angle formed by the center line of the boost hole 114 and the central axis of the pump is an acute angle.

[0031] Furthermore, the angle is 35° to 45°.

[0032] Considering that there may be leakage on the upper and lower cover plates of the impeller structure 3, which may affect vibration and efficiency, in order to reduce the above-mentioned adverse effects, the applicant found that adding small blades to the cover plates can accelerate the flow and recovery of the fluid, and can also reduce the possibility of surge noise at a certain location to a certain extent.

[0033] Furthermore, the axial length of the first buffer cavity 121 is equal to that of the suction radial section positive guide vane 131 , the axial length of the second buffer cavity 122 is equal to that of the discharge radial section positive guide vane 133 , and the axial length of the flow passage 123 is equal to that of the axial section positive guide vane 132 .

[0034] Furthermore, the suction radial section positive guide vanes 131 , the discharge radial section positive guide vanes 133 , and the reverse guide vanes 111 are all three-dimensional twisted space vanes.

[0035] Furthermore, the axial section positive guide vane 132 is a straight plate type blade.

[0036] The buffer cavity and the flow channel are adapted to the radial section positive guide vanes and the axial section positive guide vanes, which increase the stability to a certain extent. The essence of the pressure stabilizing and vibration reducing structure 12 is to cache and assist in pressurization through the cavity, thereby improving the flow efficiency of the guide vanes. In addition, it can also significantly reduce the turbulence and vibration generated when the fluid changes direction at a large angle. The cached fluid is continuously and slowly released, which turns the turbulence into laminar flow to a certain extent, thereby improving the transportation efficiency and compactness.

[0037] Furthermore, a positive guide vane inlet cover plate annular groove 103 is provided on the flow channel side surface of the positive guide vane inlet cover plate 101 , and the radial width of the positive guide vane inlet cover plate annular groove 103 is smaller than the radial width of the positive guide vane inlet cover plate 101 .

[0038] Furthermore, a positive guide vane outlet cover plate annular groove 104 is provided on the flow channel side surface of the positive guide vane outlet cover plate 102 .

[0039] Furthermore, the radial width of the positive guide vane outlet cover plate annular groove 104 is greater than the radial width of the positive guide vane inlet cover plate annular groove 103 , and the axial depth of the positive guide vane outlet cover plate annular groove 104 is greater than the axial depth of the positive guide vane inlet cover plate annular groove 103 .

[0040] The arrangement of grooves on the flow wall improves the adhesion between the fluids to a certain extent, and the improvement in conveying efficiency is also obvious and outstanding.

[0041] Furthermore, the buffer inlet 124 is a flow channel with a constant cross section, and the buffer outlet 125 is a jet flow channel that gradually contracts along the fluid flow direction.

[0042] Given that the first buffer chamber 121 only serves the function of storage and caching, the structure of the buffer inlet 124 can be a flow channel with equal cross-section. This structure greatly reduces the impact on the flow state near the positive guide vane 131 of the suction radial section; on the contrary, the buffer outlet 125 is designed as a tapered jet flow channel in order to reduce turbulence and better accelerate the flow of the fluid in the guide vane. This structure greatly increases the conveying efficiency, reduces vibration and noise, and improves stability and compactness.

[0043] The present invention provides a low-vibration, high-efficiency, compact deep-well pump, whose guide vane structure is installed on the pump casing stage; the guide vane structure consists of positive guide vanes and reverse guide vanes; the positive guide vanes are arranged along the axial direction, and include a positive guide vane inlet cover plate, a positive guide vane outlet cover plate, and positive guide vanes, and the cross-sectional projection of the positive guide vanes is a "["-shaped structure, which is composed of a positive guide vane in the suction radial section, a positive guide vane in the axial section, and a positive guide vane in the discharge radial section connected in sequence; a pressure stabilizing and vibration reducing structure is provided on the side wall of the pump casing stage corresponding to the positive guide vane, and includes a first buffer chamber, a flow channel, and a second buffer chamber, the first buffer chamber corresponds to the positive guide vane in the suction radial section and is connected through a buffer inlet, the second buffer chamber corresponds to the positive guide vane in the discharge radial section and is connected through a buffer outlet, the flow channel connects the first buffer chamber and the second buffer chamber, and the cross-section of the flow channel is a tapered structure along the fluid flow direction; the reverse guide vanes are arranged along the radial direction, and include reverse guide vanes and a reverse guide vane rear cover plate, and the radial outer end of the reverse guide vane rear cover plate is installed corresponding to the positive guide vane in the axial section, and there is a micro-flow gap between the two. Improvements to the impeller and guide vane structure reduce vibration and instability, thereby improving operating performance, efficiency and compactness.

Claims

1. A low-vibration, high-efficiency, compact deep-well pump, comprising a water inlet section (1), a pump shaft (2), an impeller structure (3), a guide vane structure (4), and a water outlet section (5), wherein two or more impeller structures (3) and guide vane structures (4) are connected in series via the pump shaft (2) to form a deep-well pump; the impeller structure (3) is mounted on the pump shaft (2) via a key (6), the guide vane structure (4) is fixed to the pump shaft (2) via a shaft sleeve (7) and a bearing (8), and the two or more impeller structures (3) and guide vane structures (4) are arranged in an overlapping manner; and the deep-well pump is characterized in that: The guide vane structure (4) is installed on the pump casing stage (9); the guide vane structure (4) consists of a positive guide vane (10) and a reverse guide vane (11); the positive guide vane (10) is arranged along the axial direction, and includes a positive guide vane inlet cover plate (101), a positive guide vane outlet cover plate (102), and a positive guide vane (13); the cross-sectional projection of the positive guide vane (13) is a "["-shaped structure, and is formed by sequentially connecting a suction radial section positive guide vane (131), an axial section positive guide vane (132), and a discharge radial section positive guide vane (133); a pressure stabilizing and vibration reducing structure (12) is provided on the side wall of the pump casing stage (9) corresponding to the positive guide vane (13), and includes a first buffer chamber (121), a flow passage (123), a second buffer chamber ( 122), the first buffer chamber (121) corresponds to the positive guide vane (131) of the suction radial section and is communicated with via a buffer inlet (124), the second buffer chamber (122) corresponds to the positive guide vane (133) of the discharge radial section and is communicated with via a buffer outlet (125), the flow passage (123) is connected to the first buffer chamber (121) and the second buffer chamber (122), the cross section of the flow passage (123) is a tapered structure along the fluid flow direction; the reverse guide vane (11) is arranged in the radial direction, and includes a reverse guide vane (111) and a reverse guide vane rear cover plate (112), the radial outer end of the reverse guide vane rear cover plate (112) is installed corresponding to the axial section positive guide vane (132), and a micro flow gap exists between the two.

2. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: The impeller structure (3) comprises an impeller back blade (31) and an impeller cover blade (32); a first annular groove (113) is provided on the outer side of the anti-guide vane rear cover plate (112); the impeller back blade (31) extends deep into the first annular groove (113) along the axial direction; and a supercharging hole (114) is provided at the bottom of the first annular groove (113) and penetrates the anti-guide vane rear cover plate (112).

3. The low-vibration, high-efficiency, compact deep well pump according to claim 2, characterized in that: A second annular groove (91) is provided on the outside of the pump casing stage (9), and the impeller cover blades (32) are axially inserted into the second annular groove (91).

4. The low-vibration, high-efficiency, compact deep well pump according to claim 2, characterized in that: The angle formed by the center line of the boost hole (114) and the center axis of the pump is an acute angle.

5. The low-vibration, high-efficiency, compact deep well pump according to claim 4, characterized in that: The angle is 35° to 45°.

6. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: The first buffer chamber (121) has the same axial length as the suction radial section positive guide vane (131), the second buffer chamber (122) has the same axial length as the discharge radial section positive guide vane (133), and the flow passage (123) has the same axial length as the axial section positive guide vane (132).

7. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: The positive guide vanes (131) of the suction radial section, the positive guide vanes (133) of the discharge radial section, and the reverse guide vanes (111) are all three-dimensional twisted space vanes.

8. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: The axial section positive guide vane (132) is a straight plate type blade.

9. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: A positive guide vane inlet cover plate annular groove (103) is provided on the flow channel side of the positive guide vane inlet cover plate (101), and the radial width of the positive guide vane inlet cover plate annular groove (103) is smaller than the radial width of the positive guide vane inlet cover plate (101).

10. The low-vibration, high-efficiency, compact deep well pump according to claim 9, characterized in that: A positive guide vane outlet cover plate annular groove (104) is provided on the flow channel side surface of the positive guide vane outlet cover plate (102).

11. The low-vibration, high-efficiency, compact deep well pump according to claim 10, characterized in that: The radial width of the positive guide vane outlet cover plate annular groove (104) is greater than the radial width of the positive guide vane inlet cover plate annular groove (103), and the axial depth of the positive guide vane outlet cover plate annular groove (104) is greater than the axial depth of the positive guide vane inlet cover plate annular groove (103).

12. The low-vibration, high-efficiency, compact deep well pump according to claim 1, characterized in that: The buffer inlet (124) is a flow channel with a constant cross section, and the buffer outlet (125) is a jet flow channel that gradually contracts along the flow direction of the fluid.

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