A vertical centrifugal pump suction chamber with a liftable spiral structure

Abstract

The present invention relates to a vertical centrifugal pump suction chamber with a liftable spiral structure in the technical field of centrifugal pumps, comprising a pump body component, the inner side of the pump body component having a spiral structure, the inner side of the pump body component having a mounting hole capable of limiting the spiral structure, the mounting hole and the axis of the spiral structure being located on the same center line, the inner side of the pump body component having a suction chamber water inlet section, the suction chamber water inlet section being arranged inside the pump body component, and the center line of the suction chamber water inlet section being an arc. The vertical centrifugal pump suction chamber with a liftable spiral structure provided by the present application can be used for centrifugal pumps, and relative to ordinary centrifugal pump suction chambers, the suction chamber provided by the present application has the advantages of forming negative pre-swirl before the fluid enters the inducer, making the medium flow even and increasing the flow rate of the medium entering the inducer, thereby increasing the efficiency of the inducer, and is used to solve the problems existing in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to a vertical centrifugal pump suction chamber with a liftable spiral structure. Background Art

[0002] Centrifugal pumps are the most widely used pumps, not only in the fields of industry and agriculture such as petroleum, chemical industry, water conservancy, but also in high-tech fields such as aviation and nuclear energy. The suction chamber is an important flow-through component in the centrifugal pump. At present, there are three main structures of the suction chamber of the centrifugal pump: conical tube suction chamber, spiral suction chamber, and annular suction chamber.

[0003] These suction chambers will cause the fluid to collide before entering the impeller, which has a certain impact on the head and efficiency of the centrifugal pump. In particular, the fluid in the suction chamber of the vertical centrifugal pump needs to change from horizontal flow to vertical flow before entering the inducer and impeller flow channel. In this process, there will be a large energy loss and uneven flow and positive pre-swirl, thereby reducing the hydraulic performance of the pump. Therefore, it is necessary to study the suction chamber of the vertical centrifugal pump.

[0004] For this purpose, we propose a vertical centrifugal pump suction chamber with a liftable spiral structure. Summary of the invention

[0005] In view of the above problems, the present invention provides a vertical centrifugal pump suction chamber with a liftable spiral structure.

[0006] The technical solution of the present invention is: a vertical centrifugal pump suction chamber with a liftable spiral structure, including a pump body component, the inner side of the pump body component has a spiral structure, the inner side of the pump body component has a mounting hole that can limit the spiral structure, the mounting hole and the axis of the spiral structure are located on the same center line, the inner side of the pump body component has a suction chamber water inlet section, the suction chamber water inlet section is opened inside the pump body component, and the center line of the suction chamber water inlet section is arc-shaped.

[0007] The vertical centrifugal pump suction chamber with a liftable spiral structure provided by the present application can be used for centrifugal pumps. Compared with ordinary centrifugal pump suction chambers, the suction chamber provided by the present application has the advantages of forming negative pre-vortex before the fluid enters the inducer, making the medium flow evenly and increasing the flow rate of the medium entering the inducer, thereby increasing the efficiency of the inducer. This solves the problem in the prior art that the fluid in the suction chamber of a vertical centrifugal pump needs to be converted from a horizontal flow direction to a vertical flow direction before entering the inducer and the impeller flow channel, and that there will be a large energy loss in the process, as well as causing uneven flow and positive pre-vortex, thereby reducing the hydraulic performance of the pump.

[0008] In a further technical solution, one side of the suction chamber water inlet section extending to the interior of the pump body component has a suction chamber water outlet section connected to the suction chamber water inlet section, and the suction chamber water outlet section is opened inside the pump body component.

[0009] In the present application, the suction chamber water inlet section is opened at the right side of the pump body component, and the suction chamber water inlet section, the suction chamber water outlet section and the mounting hole form a curved channel that runs through the pump body component, wherein the size of the suction chamber water inlet section opened at the outer wall of the pump body component gradually decreases to the size of the suction chamber water inlet section extending to the inside of the pump body component.

[0010] In a further technical solution, the spiral structure includes a fixed bottom boss and a fixed rod, the fixed rod is fixed to the outer surface of the bottom boss, and the outer side of the fixed rod has a spiral blade contained inside the spiral structure, the spiral blade is fixed to the outer surface of the fixed rod, and the spiral blade is connected to the bottom boss.

[0011] In the present application, the spiral blade has a left-handed rotation direction and is able to contact the pump body component, wherein the inner and outer spiral lines of the rising portion of the spiral blade are related to the size of the water outlet section of the suction chamber.

[0012] In a further technical solution, the inner side of the pump body component has a bottom opening, the bottom opening is opened inside the pump body component, the bottom boss is connected to the pump body component, and the bottom boss can drive the fixed rod and the spiral blade to move along the extension line of the center line of the fixed rod.

[0013] In the present application, the placement angle of the bottom opening is related to the size of the water outlet section of the suction chamber, and the shape of the hole fits the spiral blade.

[0014] In a further technical solution, the inner side of the pump body component is provided with a connecting component, the connecting component is installed on the inner side of the pump body component, the inner side of the connecting component is provided with an inducer water inlet section, the inducer water inlet section is arranged between the connecting component and the pump body component, and the inducer water inlet section is installed on the inner side of the connecting component.

[0015] In a further technical solution, the connection component has a water inlet blade inside, the water inlet blade is installed inside the connection component, and the water inlet blade is arranged on the extension line of the center line of the fixing rod and the spiral blade.

[0016] In the present application, the water inlet blades and spiral blades inside the water inlet section of the inducer rotate in opposite directions, and the water inlet blades are installed in an inverted trapezoidal shaft setting, and the water inlet blades and spiral blades are on the same axis.

[0017] In a further technical solution, the pump body component has a pressure plate inside, the pressure plate is movably arranged between the pump body component and the spiral structure, and the outer side of the pressure plate has a slider, and the slider is fixed to the outer surface of the pressure plate.

[0018] In the present application, the pressure plate is an inverted T-shaped tube, and has a slide groove inside the pump body component for the slider to move. The number of the slide grooves is consistent with the number of sliders, and the internal size of the slide groove is a clearance fit with the slider.

[0019] In a further technical solution, the pressure plate has a limit block on one side close to the bottom boss, the limit block is fixed to the outer surface of the pressure plate, the limit block can contact the bottom boss, and a compression spring is provided between the pressure plate and the pump body component, one end of the compression spring is fixed to the outer surface of the pressure plate, and the other end of the compression spring is fixed to the inside of the pump body component.

[0020] In the present application, the cross-sectional shape of the limit block is a triangle, and one corner of the bottom of the inverted triangle is designed as an arc transition, and a positioning groove capable of contacting the limit block is provided at the contact position between the bottom boss and the pressure plate.

[0021] In a further technical solution, the slider contacts the pump body component, and the outer side has a protective belt, one end of the protective belt is fixed to the inner side of the pump body component, and the other end of the protective belt is fixed to the outer surface of the slider.

[0022] In the present application, the protective belt is made of elastic material and can be stretched under the movement of the slider, wherein the interior of the pump body component has a limiting groove that allows the protective belt to fit, and the limiting grooves are respectively opened on the inner wall of the pump body component and the outer surface of the slider.

[0023] The beneficial effects of the present invention are:

[0024] 1. It can form negative pre-swirl before the fluid enters the inducer, making the medium flow evenly and increasing the flow rate of the medium entering the inducer, thereby increasing the efficiency of the inducer; it also plays a certain guiding role in the medium's transformation from horizontal flow to vertical flow, reducing the collision between fluids and thus reducing energy loss;

[0025] 2. When the spiral structure is installed, the stability of the spiral structure can be ensured, and the position of the spiral structure can be ensured not to change during the flow of the medium; and the slider capable of limiting the position can be used to increase the stroke of the spiral structure, and a protective belt can be used for protection during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of the overall structure in an embodiment of the present invention;

[0027] Figure 2 It is a partial schematic diagram of the bottom opening shape structure in an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a spiral structure in an embodiment of the present invention;

[0029] Figure 4 is a top view of the spiral structure in an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of a local structure in an embodiment of the present invention;

[0031] Figure 6 is a bottom sectional view of a slider structure in an embodiment of the present invention;

[0032] Figure 7 It is a partial schematic diagram of the limit block and positioning groove structure of an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Water inlet section of suction chamber; 2. Water outlet section of suction chamber; 3. Pump body parts; 4. Water inlet section of inducer; 5. Spiral structure; 51. Spiral blades; 52. Fixing rod; 53. Bottom boss; 54. Bottom opening; 6. Connecting parts; 7. Water inlet blades; 8. Pressure plate; 9. Compression spring; 10. Sliding block; 11. Limit block; 12. Protective belt. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] Example:

[0037] like Figure 1-Figure 7 As shown, a vertical centrifugal pump suction chamber with a liftable spiral structure includes a pump body component 3, the inner side of the pump body component 3 has a spiral structure 5, the inner side of the pump body component 3 has a mounting hole capable of limiting the spiral structure 5, the mounting hole and the axis of the spiral structure 5 are located on the same center line, the inner side of the pump body component 3 has a suction chamber water inlet section 1, the suction chamber water inlet section 1 is opened inside the pump body component 3, and the center line of the suction chamber water inlet section 1 is arc-shaped.

[0038] The vertical centrifugal pump suction chamber with a liftable spiral structure provided by the present application can be used for centrifugal pumps. Compared with ordinary centrifugal pump suction chambers, the suction chamber provided by the present application has the advantages of forming negative pre-vortex before the fluid enters the inducer, making the medium flow evenly and increasing the flow rate of the medium entering the inducer, thereby increasing the efficiency of the inducer. This solves the problem in the prior art that the fluid in the suction chamber of a vertical centrifugal pump needs to be converted from a horizontal flow direction to a vertical flow direction before entering the inducer and the impeller flow channel, and that there will be a large energy loss in the process, as well as causing uneven flow and positive pre-vortex, thereby reducing the hydraulic performance of the pump.

[0039] In another embodiment, one side of the suction chamber water inlet section 1 extending to the inside of the pump body component 3 has a suction chamber water outlet section 2 connected to the suction chamber water inlet section 1 , and the suction chamber water outlet section 2 is opened inside the pump body component 3 .

[0040] In the present application, the suction chamber water inlet section 1 is opened at the right side of the pump body component 3, and the suction chamber water inlet section 1, the suction chamber water outlet section 2 and the mounting hole form a curved channel that runs through the pump body component 3, wherein the size of the suction chamber water inlet section 1 opened at the outer wall of the pump body component 3 gradually decreases to the size of the suction chamber water inlet section 1 extending to the inside of the pump body component 3.

[0041] Among them, the spiral structure 5 and the pump body component 3 are connected by a thread that can limit the movement of the spiral structure 5. The spiral rotation direction between the spiral structure 5 and the pump body component 3 is consistent with the rotation direction of the spiral blade 51. It can be understood that when the spiral structure 5 rotates, it can rotate and move relative to the pump body.

[0042] In another embodiment, the spiral structure 5 includes a fixed bottom boss 53 and a fixed rod 52, the fixed rod 52 is fixed to the outer surface of the bottom boss 53, and the outer side of the fixed rod 52 has a spiral blade 51 contained inside the spiral structure 5, the spiral blade 51 is fixed to the outer surface of the fixed rod 52, and the spiral blade 51 is connected to the bottom boss 53.

[0043] In the present application, the spiral blade 51 is left-handed, and the spiral blade 51 can contact the pump body component 3, wherein the inner and outer spiral lines of the rising part of the spiral blade 51 are related to the size of the water outlet section 2 of the suction chamber.

[0044] The radius of the fixed rod 52 is r = 0.06R, and the height is The center is located at O, on the axis of the inducer.

[0045] The thickness of the spiral blade 51 is It is divided into two inner and outer cylindrical spiral lines, both of which are left-handed and opposite to the rotation direction of the inducer. Each spiral line is composed of two spiral lines connected together.

[0046] The radius of the outer helix is ​​L, and the pitch of the upper helix is Lead The pitch of the lower helix is Lead

[0047] The radius of the inner helix is ​​r, and the pitch of the upper helix is Lead The pitch of the lower helix is Lead

[0048] Among them, H is the height of the suction chamber outlet section 2, R is the base circle radius of the bottom of the suction chamber outlet section 2, and L is the distance from the center to the rightmost end of the base circle.

[0049] In another embodiment, the inner side of the pump body component 3 has a bottom opening 54, the bottom opening 54 is opened inside the pump body component 3, the bottom boss 53 is connected to the pump body component 3, and the bottom boss 53 can drive the fixing rod 52 and the spiral blade 51 to move along the extension line of the center line of the fixing rod 52.

[0050] The bottom boss 53 is composed of a non-threaded boss and a threaded boss. The radius of the non-threaded boss is L and the height is The thread boss radius is greater than L.

[0051] In the present application, the placement angle of the bottom opening 54 is related to the size of the water outlet section 2 of the suction chamber, and the shape of the hole fits the spiral blade 51 .

[0052] The bottom opening 54 is placed at an angle

[0053] In another embodiment, the inner side of the pump body component 3 has a connecting component 6, which is installed on the inner side of the pump body component 3. The inner side of the connecting component 6 has an inducer water inlet section 4, which is arranged between the connecting component 6 and the pump body component 3, and the inducer water inlet section 4 is installed on the inner side of the connecting component 6.

[0054] In another embodiment, the connection component 6 has a water inlet blade 7 inside, the water inlet blade 7 is installed inside the connection component 6 , and the water inlet blade 7 is arranged on the extension line of the center line of the fixing rod 52 and the spiral blade 51 .

[0055] In the present application, the water inlet blades 7 inside the inducer water inlet section 4 rotate in opposite directions to the spiral blades 51, and the installation position of the water inlet blades 7 is an inverted trapezoidal axis setting, and the water inlet blades 7 and the spiral blades 51 are on the same axis.

[0056] In another embodiment, the pump body component 3 has a pressure plate 8 inside, which is movably arranged between the pump body component 3 and the spiral structure 5 , and the pressure plate 8 has a slider 10 on the outside, which is fixed to the outer surface of the pressure plate 8 .

[0057] In the present application, the pressure plate 8 is an inverted T-shaped tube, and has a slide groove inside the pump body part 3 for the slider 10 to move. The number of the slide grooves is consistent with the number of the sliders 10, and the internal size of the slide groove is a clearance fit with the slider 10.

[0058] The slider 10 is located on the outer surface of the pressure plate 8, and the pressure plate 8 can contact the pump body component 3, and the pressure plate 8 can move under the push of the spiral structure 5. Exemplarily, there are four slide grooves and four sliders 10. The slider 10 can limit the pressure plate 8 to prevent the pressure plate 8 from rotating.

[0059] In another embodiment, a limit block 11 is provided on the side of the pressure plate 8 close to the bottom boss 53, and the limit block 11 is fixed to the outer surface of the pressure plate 8. The limit block 11 can contact the bottom boss 53, and a compression spring 9 is provided between the pressure plate 8 and the pump body component 3, and one end of the compression spring 9 is fixed to the outer surface of the pressure plate 8, and the other end of the compression spring 9 is fixed to the inside of the pump body component 3.

[0060] In the present application, the cross-sectional shape of the limit block 11 is a triangle, and one corner of the bottom of the inverted triangle is designed as an arc transition, and a positioning groove capable of contacting the limit block 11 is provided at the contact position between the bottom boss 53 and the pressure plate 8 .

[0061] There are four limit blocks 11 and multiple positioning slots, which are evenly distributed.

[0062] In another embodiment, the slider 10 contacts the pump body component 3 and has a protective belt 12 on its outer side. One end of the protective belt 12 is fixed to the inner side of the pump body component 3 , and the other end of the protective belt 12 is fixed to the outer surface of the slider 10 .

[0063] In the present application, the protective belt 12 is made of elastic material and can be stretched under the movement of the slider 10, wherein the interior of the pump body component 3 has a limiting groove that allows the protective belt 12 to fit, and the limiting groove is respectively opened on the inner wall of the pump body component 3 and the outer surface of the slider 10.

[0064] Working principle: insert the sealing ring into the non-threaded section from the bottom of the pump body, and then install the spiral structure 5 into the inner pump body component 3. After the spiral structure 5 is installed, the pressure plate 8 will make the limit block 11 fit with the positioning groove under the action of the compression spring 9. The pressure plate 8 will also stretch the protective belt 12 under the action of the compression spring 9. The slider 10 moves inside the slide groove, and the spiral blade 51 and the fixing rod 52 will pass through the bottom opening 54 and enter the water outlet section 2 of the suction chamber.

[0065] The above embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A vertical centrifugal pump suction chamber with a liftable spiral structure, comprising a pump body component (3), characterized in that: The pump body component (3) has a spiral structure (5) on the inner side, and the pump body component (3) has a mounting hole on the inner side that can limit the spiral structure (5), and the mounting hole and the axis of the spiral structure (5) are located on the same center line, and the pump body component (3) has a suction chamber water inlet section (1) on the inner side, and the suction chamber water inlet section (1) is opened inside the pump body component (3), and the center line of the suction chamber water inlet section (1) is arc-shaped, and the spiral structure (5) includes a fixed bottom boss (53) and a fixed rod (52), and the fixed rod (52) is fixed to the outer surface of the bottom boss (53), and the outer side of the fixed rod (52) has a spiral blade (51) contained in the spiral structure (5), and the spiral blade (51) is fixed to the outer surface of the fixed rod (52), and the spiral The blade (51) is connected to the bottom boss (53). The inner side of the pump body component (3) has a bottom opening (54). The bottom opening (54) is opened inside the pump body component (3). The bottom boss (53) is connected to the pump body component (3), and the bottom boss (53) can drive the fixing rod (52) and the spiral blade (51) to move along the extension line of the center line of the fixing rod (52). The inner side of the pump body component (3) has a connecting component (6). The connecting component (6) is installed on the inner side of the pump body component (3). The inner side of the connecting component (6) has an inducer water inlet section (4). The inducer water inlet section (4) is arranged between the connecting component (6) and the pump body component (3), and the inducer water inlet section (4) is installed on the inner side of the connecting component (6).

2. A vertical centrifugal pump suction chamber with a liftable spiral structure according to claim 1, characterized in that: The side of the suction chamber water inlet section (1) extending to the interior of the pump body component (3) comprises a suction chamber water outlet section (2) connected to the suction chamber water inlet section (1), and the suction chamber water outlet section (2) is arranged inside the pump body component (3).

3. The vertical centrifugal pump suction chamber with a liftable spiral structure according to claim 1, characterized in that: The connection component (6) has a water inlet blade (7) inside. The water inlet blade (7) is installed inside the connection component (6), and the water inlet blade (7) is arranged on the extension line of the center line of the fixing rod (52) and the spiral blade (51).

4. The vertical centrifugal pump suction chamber with a liftable spiral structure according to claim 1, characterized in that: The pump body component (3) has a pressure plate (8) inside, and the pressure plate (8) is movably arranged between the pump body component (3) and the spiral structure (5). The pressure plate (8) has a slider (10) on the outside, and the slider (10) is fixed to the outer surface of the pressure plate (8).

5. A vertical centrifugal pump suction chamber with a liftable spiral structure according to claim 4, characterized in that: The pressure plate (8) has a limit block (11) on one side close to the bottom boss (53), and the limit block (11) is fixed to the outer surface of the pressure plate (8). The limit block (11) can contact the bottom boss (53). A compression spring (9) is provided between the pressure plate (8) and the pump body component (3), and one end of the compression spring (9) is fixed to the outer surface of the pressure plate (8), and the other end of the compression spring (9) is fixed inside the pump body component (3).

6. The vertical centrifugal pump suction chamber with a liftable spiral structure according to claim 4, characterized in that: The slider (10) is in contact with the pump body component (3), and the outer side has a protective belt (12), one end of the protective belt (12) is fixed to the inner side of the pump body component (3), and the other end of the protective belt (12) is fixed to the outer surface of the slider (10).

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