Single-stage centrifugal pump with volume-adjustable pumping chamber

Abstract

The utility model discloses a pumping chamber volume adjustable single-stage centrifugal pump which comprises a first motor and a pump shell, a fixing block is installed at the bottom of the first motor, and one end of the fixing block is fixedly connected with the motor. The pump shell is of a cylinder structure. An inner cavity of the pump shell is a hollow part, a fixed plate is arranged in the inner cavity of the pump shell, one end of a spring is fixedly connected to the fixed plate, the other end of the spring is fixedly connected with a movable plate, a sliding rail is fixedly arranged on the movable plate, a rotating rod is matched with the sliding rail, a through sliding block is arranged at one end of the rotating rod, and the other end of the rotating rod is fixedly connected with one end of a fixed shaft; the second motor drives the fixed shaft to rotate, the fixed shaft drives the rotating rod to eccentrically rotate, one end of the rotating rod moves up and down in the sliding rail, the other end of the rotating rod rotates in the inner cavity of the pump shell, and under the action of the spring, the inner space between the fixed plate and the movable plate can be adjusted, so that the volume of the pumping chamber is adjusted.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump technology, specifically, it relates to a single-stage centrifugal pump with adjustable pressure chamber volume. Background Technology

[0002] The concept of volumetric efficiency is often used in reciprocating pumps (such as diaphragm pumps and metering pumps) and rotary pumps (such as gear pumps and screw pumps), where changes in the pump chamber volume play a crucial role in the delivery of the medium. Similarly, the ratio of the flow rate at the outlet of a centrifugal pump to the flow rate through the impeller can also reflect the volumetric efficiency of the centrifugal pump and is used to measure the overall performance of a pump.

[0003] During the operation of a centrifugal pump, the flow rate through the impeller is kineticly powered by the blades, and the medium is thrown from the impeller outlet into the casing flow channel. Due to leakage factors in this process, the pump's flow rate will be lost to some extent. Centrifugal pumps often achieve the required operating point parameters by reducing the outer diameter of the impeller. After the impeller is cut, the distance between the impeller outer diameter and the casing flow channel will increase, causing the pump's volumetric efficiency to decrease. The smaller the outer diameter of the impeller after cutting, the greater the decrease in the pump's volumetric efficiency.

[0004] Patent CN214036242U discloses a single-stage centrifugal pump that modifies the overall structure of the centrifugal pump by designing the front and rear cover plates of the impeller to be triangular with missing corners. When the impeller rotates, the cover plates also participate in the work done on the liquid while the blades are working on it, effectively eliminating the hump phenomenon of the pump head curve and making the pumping system stable. The use of three blades reduces the weight of the finished impeller, saves materials, saves costs, and has good versatility. However, by using three blades to reduce the weight of the finished impeller, the volumetric efficiency of the pump decreases, making it impossible to adjust the volume of the pressure chamber according to actual conditions.

[0005] The technical solutions of the aforementioned patents have problems such as requiring the centrifugal pump's volumetric efficiency to be adjusted by changing the blades, and not being able to adjust the centrifugal pump's volumetric efficiency according to actual conditions. Utility Model Content

[0006] To address the technical problem in existing technologies where the volumetric efficiency of a centrifugal pump must be adjusted by changing the outer diameter of the blades, this invention provides a single-stage centrifugal pump with an adjustable pressure chamber volume.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A single-stage centrifugal pump with adjustable pressure chamber volume includes a first motor and a pump casing. A fixing block is installed at the bottom of the first motor, and one end of the fixing block is fixedly connected to the first motor. The pump casing is a cylindrical structure. The inner cavity of the pump casing is a hollow part. A fixing plate is provided in the inner cavity of the pump casing. One end of a spring is fixedly connected to the bottom surface of the fixing plate away from the first motor. The other end of the spring is fixedly connected to the bottom surface of a movable plate. A slide rail is fixedly provided on the movable plate on the same side of the bottom surface as the spring. A rotating rod is provided in cooperation with the slide rail. One end of the rotating rod is provided with a through sliding block, and the other end of the rotating rod is fixedly connected to one end of a fixed shaft.

[0009] Furthermore, the fixed plate is located on the side close to the first motor. The fixed plate has a circular structure, and its side is fixedly connected to the inner surface of the pump casing. The movable plate has a circular structure, and its side is movably connected to the inner surface of the pump casing. The movable plate is located in the inner cavity of the pump casing.

[0010] Furthermore, one end of the connecting block is fixedly installed at the output end of the first motor, and the other end of the connecting block is fixedly connected to the bottom surface of the pump casing.

[0011] Furthermore, the bottom surface of the slide rail is fixedly connected to the bottom surface of the movable plate, and the slide rail has a through slot; the slide rail is located on one side of the pump shaft, and the sliding block passes through the slots of the two slide rails; the bottom surface near the sliding block rotating rod is movably connected to the bottom surface of the movable plate.

[0012] Furthermore, the other end of the fixed shaft is connected to the output end of the second motor, which is located on the outside of the pump casing. The output end of the second motor passes through the pump casing and connects to the fixed shaft.

[0013] Furthermore, the fixed shaft drives the rotating rod to rotate eccentrically. One end of the rotating rod moves up and down in the slide rail, while the other end of the rotating rod rotates eccentrically at 10-30 degrees in the inner cavity of the pump casing.

[0014] Furthermore, a bellows is provided on the movable plate. One end of the bellows is fixedly connected to the bottom surface of the movable plate, and the other end of the bellows is fixedly connected to one end of the fixing ring. The width of the fixing ring is greater than the thickness of the bellows. The curved surface of the fixing ring is fixedly connected to the inner cavity of the pump casing. The fixing ring is located in the inner cavity of the pump casing and in the middle of the fixed plate and the movable plate.

[0015] Furthermore, the output end of the first motor is connected to one end of the pump shaft, and the other end of the pump shaft passes through the connecting block, the fixed plate, and the movable plate and is fitted with blades; the blades are located on the movable plate side opposite to the spring; the blades are located in the inner cavity of the pump casing.

[0016] Furthermore, one end of the pump casing is connected to the pump cover; a suction pipe is provided through the middle of the pump cover, and a discharge pipe is provided through the upper arc surface of the pump cover.

[0017] The beneficial effects of this utility model are:

[0018] 1) This utility model uses a second motor to drive the fixed shaft to rotate, and the fixed shaft drives the rotating rod to rotate eccentrically. One end of the rotating rod moves up and down in the slide rail, and the other end of the rotating rod rotates at 10-30 degrees in the inner cavity of the pump casing. Under the action of the spring, the internal space between the fixed plate and the movable plate can be adjusted, so that the volume of the pressure chamber can be adjusted.

[0019] 2) When the spring extends and retracts between the fixed plate and the movable plate, the movement of the movable plate will cause the bellows to extend and retract between the movable plate and the fixed ring, so that the liquid in the pump casing flows between the fixed ring and the pump cover. The fixed ring increases its sealing performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a front sectional view of the present invention;

[0023] Figure 3 This is an enlarged view of point A in this utility model;

[0024] Figure 4 This is a schematic diagram showing the connection between the spring and the fixing plate of this utility model;

[0025] Figure 5 This is a schematic diagram showing the connection between the spring and the movable plate of this utility model;

[0026] The list of components represented by each number in the attached diagram is as follows:

[0027] 1. First motor; 2. Pump casing; 3. Suction pipe; 4. Discharge pipe; 5. Second motor; 6. Fixing block; 7. Blade; 8. Pump shaft; 9. Spring; 10. Fixing plate; 11. Movable plate; 12. Bellows; 13. Fixing shaft; 14. Rotating rod; 15. Slide rail; 16. Pump cover; 17. Fixing ring; 18. Connecting block; 19. Sliding block. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1 and Figure 2 as well as Figure 3 As shown, a single-stage centrifugal pump with adjustable pressure chamber volume includes a first motor 1 and a pump casing 2. A fixing block 6 is installed at the bottom of the first motor 1, and one end of the fixing block 6 is fixedly connected to the arc surface of the first motor to ensure the stability of the entire pump. One end of a connecting block 18 is installed at the output end of the first motor 1, and the other end of the connecting block 18 is connected to the bottom surface of the pump casing 2. The pump casing 2 is a cylindrical structure. The inner cavity of the pump casing 2 is a hollow part, and a fixing plate 10 is provided in the inner cavity of the pump casing 2. The fixing plate 10 is located on the side close to the first motor 1. The fixing plate 10 is a circular structure, and the side of the fixing plate 10 is fixedly connected to the inner cavity surface of the pump casing 2, preferably by welding, to ensure the sealing between the fixing plate 10 and the pump casing 2.

[0030] One end of a spring 9 is fixedly connected to the bottom surface of the fixed plate 10 away from the first motor 1. In this embodiment, four springs 9 are provided, and the four springs 9 are evenly distributed around the center of the fixed plate 10. The other end of the spring 9 is fixedly connected to the bottom surface of the movable plate 11. The movable plate 11 is a circular structure, and the side of the movable plate 11 is movably connected to the inner surface of the pump housing 2. The movable plate 11 is disposed in the inner cavity of the pump housing 2.

[0031] A slide rail 15 is fixedly mounted on the movable plate 11 on the same side of the bottom surface of the spring 9. The bottom surface of the slide rail 15 is fixedly connected to the bottom surface of the movable plate 11. Two slide rails 15 are symmetrically arranged, and each slide rail 15 has a through slot. The two slide rails 15 are located on one side of the pump shaft 8. A rotating rod 14 is provided in cooperation with the slide rails 15. The rotating rod 14 is located between the two slide rails 15. One end of the rotating rod 14 has a through sliding block 19, which passes through the slot of the two slide rails 15. The bottom surface of the rotating rod 14 near the sliding block 19 is movably connected to the bottom surface of the movable plate 11. The rotating rod 14 provides a certain support force to the movable plate 11. The other end of the rotating rod 14 is fixedly connected to one end of the fixed shaft 13.

[0032] The other end of the fixed shaft 13 is connected to the output end of the second motor 5. The second motor 5 is located on the outside of the pump casing 2, and the output end of the second motor 5 passes through the pump casing 2 and is connected to the fixed shaft 13.

[0033] The second motor 5 drives the fixed shaft 13 to rotate, which in turn drives the rotating rod 14 to rotate eccentrically. One end of the rotating rod 14 moves up and down on the slide rail 15, while the other end rotates eccentrically at 10-30 degrees inside the pump housing 2. The eccentric rotation of the rotating rod 14 drives the movable plate 11 to move inside the pump housing 2. The movement of the movable plate 11 causes the spring 9 to extend and retract between the fixed plate 10 and the movable plate 11, thereby adjusting the size of the internal space between the fixed plate 10 and the movable plate 11.

[0034] When a centrifugal pump needs to operate under conditions of high flow rate, in order to accommodate more fluid and ensure that the fluid can decelerate smoothly and increase pressure, it is necessary to expand the volume of the pressure chamber. By turning on the second motor 5, the second motor 5 drives the fixed shaft 13 to rotate, and the fixed shaft 13 drives the rotating rod 14 to rotate 10 degrees. Under the action of the spring 9, the internal space between the fixed plate 10 and the movable plate 11 is reduced, thereby increasing the volume of the pressure chamber.

[0035] Increasing the volume of the pressure chamber helps improve the flow state of the fluid within it, making the pressure distribution more uniform, thereby reducing radial force to some extent and improving the pump's operational stability.

[0036] When a centrifugal pump needs to operate under relatively low flow conditions, reducing the volume of the pressure chamber can shorten the residence time of the fluid in the pressure chamber, reduce turbulence and eddies, and reduce hydraulic losses. By turning on the second motor 5, the second motor 5 drives the fixed shaft 13 to rotate, and the fixed shaft 13 drives the rotating rod 14 to rotate 30 degrees. Under the action of the spring 9, the internal space between the fixed plate 10 and the movable plate 11 is increased, thereby reducing the volume of the pressure chamber.

[0037] Reducing the volume of the pressure chamber ensures that the fluid is adequately accelerated and pressurized within the pump, avoiding excessive diffusion and energy waste.

[0038] Please see Figure 4 and Figure 5 As shown, a bellows 12 is provided on the movable plate 11 on the same side bottom surface as the spring 9. One end of the bellows 12 is fixedly connected to the bottom surface of the movable plate 11, and the other end of the bellows 12 is fixedly connected to one end of the fixing ring 17. The width of the fixing ring 17 is greater than the thickness of the bellows 12. The curved surface of the fixing ring 17 is fixedly connected to the inner cavity of the pump housing 2, preferably welded together. This ensures the sealing between the fixing ring 17 and the pump housing 2. The fixing ring 17 is located in the inner cavity of the pump housing 2 and is located in the middle of the fixed plate 10 and the movable plate 11.

[0039] The output end of the first motor 1 is connected to one end of the pump shaft 8, and the other end of the pump shaft 8 passes through the connecting block 18, the fixed plate 10 and the movable plate 11 and is fitted with blades 7; the blades 7 are located on the side of the movable plate 11 opposite to the spring 9; the blades 7 are located in the inner cavity of the pump casing 2.

[0040] One end of the pump casing 2 near the blade 7 is connected to the pump cover 16; the middle of the pump cover 16 is provided with a suction pipe 3, and the upper arc surface of the pump cover 16 is provided with a discharge pipe 4.

[0041] When the spring 9 extends and retracts between the fixed plate 10 and the movable plate 11, the movement of the movable plate 11 will cause the bellows 12 to extend and retract between the movable plate 11 and the fixed ring 17; the fixed ring 17 increases the sealing performance, allowing the liquid in the pump housing 2 to flow between the fixed ring 17 and the pump cover 16.

[0042] To facilitate understanding of the above technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below: When it is necessary to increase the volume of the pressure chamber, the second motor 5 is turned on. The second motor 5 drives the fixed shaft 13, and the fixed shaft 13 drives the rotating rod 14 to rotate in the inner cavity. One end of the rotating rod 14 moves up and down in the slide rail 15, and the other end of the rotating rod 14 rotates within a range of 10-30 degrees. When the rotating rod 14 rotates to 10 degrees, the volume of the pressure chamber is at its maximum.

[0043] Similarly, when it is necessary to reduce the volume of the pressure chamber, the volume of the pressure chamber is minimized when the rotating rod 14 is rotated to 30 degrees.

[0044] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A single-stage centrifugal pump with adjustable pressure chamber volume, comprising a first motor (1) and a pump casing (2), wherein a fixing block (6) is mounted on the bottom of the first motor (1), and one end of the fixing block (6) is fixedly connected to the first motor (1); characterized in that: The pump casing (2) is a cylindrical structure; the inner cavity of the pump casing (2) is a hollow part, and a fixed plate (10) is provided in the inner cavity of the pump casing (2). One end of the spring (9) is fixedly connected to the bottom surface of the fixed plate (10) away from the first motor (1), and the other end of the spring (9) is fixedly connected to the bottom surface of the movable plate (11). A slide rail (15) is fixedly provided on the movable plate (11) on the same side of the bottom surface of the spring (9). A rotating rod (14) is provided in cooperation with the slide rail (15). One end of the rotating rod (14) is provided with a through sliding block (19), and the other end of the rotating rod (14) is fixedly connected to one end of the fixed shaft (13).

2. The single-stage centrifugal pump with adjustable pressure chamber volume according to claim 1, characterized in that: The fixed plate (10) is located on the side close to the first motor (1). The fixed plate (10) is a circular structure, and the side of the fixed plate (10) is fixedly connected to the inner cavity surface of the pump housing (2). The movable plate (11) is a circular structure, and the side of the movable plate (11) is movably connected to the inner cavity surface of the pump housing (2). The movable plate (11) is located in the inner cavity of the pump housing (2).

3. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 1, characterized in that: One end of the connecting block (18) is fixedly installed at the output end of the first motor (1), and the other end of the connecting block (18) is fixedly connected to the bottom surface of the pump casing (2).

4. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 1, characterized in that: The bottom surface of the slide rail (15) is fixedly connected to the bottom surface of the movable plate (11), and the slide rail (15) is provided with a through slot; the slide rail (15) is located on one side of the pump shaft (8), and the sliding block (19) passes through the slots of the two slide rails (15); the bottom surface of the rotating rod (14) near the sliding block (19) is movably connected to the bottom surface of the movable plate (11).

5. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 1, characterized in that: The other end of the fixed shaft (13) is connected to the output end of the second motor (5). The second motor (5) is located on the outside of the pump casing (2). The output end of the second motor (5) passes through the pump casing (2) and is connected to the fixed shaft (13).

6. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 5, characterized in that: The fixed shaft (13) drives the rotating rod (14) to rotate eccentrically. One end of the rotating rod (14) moves up and down in the slide rail (15), and the other end of the rotating rod (14) rotates eccentrically at 10-30 degrees in the inner cavity of the pump casing (2).

7. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 4, characterized in that: The movable plate (11) is provided with a corrugated pipe (12). One end of the corrugated pipe (12) is fixedly connected to the bottom surface of the movable plate (11), and the other end of the corrugated pipe (12) is fixedly connected to one end of the fixing ring (17). The width of the fixing ring (17) is greater than the thickness of the corrugated pipe (12). The curved surface of the fixing ring (17) is fixedly connected to the inner cavity of the pump housing (2). The fixing ring (17) is located in the inner cavity of the pump housing (2) and is located in the middle of the fixing plate (10) and the movable plate (11).

8. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 1, characterized in that: The output end of the first motor (1) is connected to one end of the pump shaft (8), and the other end of the pump shaft (8) passes through the connecting block (18), the fixed plate (10) and the movable plate (11) and is fitted with blades (7); the blades (7) are set on the side of the movable plate (11) opposite to the spring (9); the blades (7) are set in the inner cavity of the pump casing (2).

9. A single-stage centrifugal pump with adjustable pressure chamber volume according to claim 8, characterized in that: One end of the pump casing (2) is connected to the pump cover (16); the middle of the pump cover (16) is provided with a suction pipe (3), and the upper arc surface of the pump cover (16) is provided with a discharge pipe (4).

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