Vacuum self-priming centrifugal pump

Abstract

The utility model discloses a vacuum self-priming centrifugal pump, which relates to the technical field of centrifugal pumps, aims to solve the problems of complex self-priming structure and high cost of the centrifugal pump, and comprises a centrifugal pump, a vacuum pump cover is mounted on one side of a main impeller of the centrifugal pump and connected with a vacuum shell through a stud, and the vacuum pump cover is mounted on the other side of the main impeller of the centrifugal pump. A vacuum self-suction impeller is installed in the cavity, a negative pressure suction hole is formed in a low-pressure area of the vacuum shell, a high-pressure exhaust hole is formed in a high-pressure area of the vacuum shell, an air hole communicated with a pump cavity is formed in the side, close to the low-pressure area, of the vacuum pump cover, and a U-shaped pipe for preventing liquid from being sucked back is arranged at an inlet of the centrifugal pump. An outlet of the centrifugal pump is provided with an outlet liquid separation tank through a flange, a baffle is arranged at a liquid inlet in the outlet liquid separation tank, one side of the outlet liquid separation tank is provided with a water injection port and a backflow port, the backflow port is connected with the negative pressure suction hole through a pipeline, and the other side of the outlet liquid separation tank is provided with an upper exhaust port.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a vacuum self-priming centrifugal pump. Background Art

[0002] In the field of centrifugal pump technology, the realization of self-priming function has always been one of the research and development focuses. Most traditional centrifugal pumps with self-priming function rely on the gas-liquid mixing principle to achieve this. This principle requires the construction of a special gas-liquid mixing structure. In order to ensure that the gas and liquid can be fully and efficiently mixed, its design tends to be complex and large, and the entire pump body needs to be almost completely wrapped in structure. Not only does it lead to a significant increase in the external dimensions of the pump body and occupy too much installation space, but the manufacturing process also involves more complex processes and high-precision components, which makes the manufacturing cost soar. The use of vacuum wheel self-priming is severely limited by the working conditions. It is usually necessary to ensure that there is stable external water or a large water storage structure on site. At the same time, automatic control is required on site to ensure that the valve can be closed and started. The two conditions are relatively complex, resulting in a low usage rate of this method.

[0003] In view of these drawbacks of the existing technology, there is an urgent need for a centrifugal pump that can achieve efficient self-priming function while taking into account cost control and has strong versatility. Utility Model Content

[0004] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the utility model proposes a vacuum self-priming centrifugal pump, which includes a centrifugal pump, a vacuum pump cover is installed on one side of the main impeller of the centrifugal pump, the vacuum pump cover is connected to the vacuum shell by a stud, and together they form an eccentric cavity, a vacuum self-priming impeller is installed in the cavity, a negative pressure suction hole is opened in the low-pressure area of ​​the vacuum shell, and a high-pressure exhaust hole is opened in the high-pressure area of ​​the vacuum shell, the vacuum pump cover is provided with an air hole communicating with the pump cavity on the side close to the low-pressure area, and a U-shaped tube is provided at the inlet of the centrifugal pump to prevent liquid backflow; an outlet liquid separator is installed at the outlet of the centrifugal pump through a flange, a baffle is provided at the liquid inlet in the outlet liquid separator, a water injection port and a reflux port are provided on one side of the outlet liquid separator, the reflux port is connected to the negative pressure suction hole through a pipeline, and an upper exhaust port is provided on the other side of the outlet liquid separator, and the upper exhaust port is connected to the high-pressure exhaust hole through a pipeline, forming a water circulation system with vacuum self-priming and exhaust function.

[0005] The utility model is further configured as follows: the vacuum self-priming impeller is coaxially driven with the main impeller of the centrifugal pump.

[0006] The present invention is further configured as follows: a flushing port is provided at the top of the vacuum shell, and the flushing port is connected to the pump body outlet through a pipeline.

[0007] The beneficial technical effect of the present invention is that compared with the traditional self-priming centrifugal pump, the present invention can give the mature centrifugal pump product a self-priming function by adding accessories, getting rid of the limitations of external water connection and valve closing and starting, broadening the scope of application of the product, and significantly enhancing the versatility of the product in different application scenarios, so that it can more widely meet the needs of various users.

[0008] Its structural design is compact and relatively simple in construction, which reduces space occupancy and facilitates installation, maintenance, and layout and use under different spatial conditions. It is easy to process and manufacture, which not only effectively shortens the production cycle but also significantly reduces manufacturing costs.

[0009] It has a high vacuum degree and outstanding self-priming ability. It can quickly achieve self-priming operation under many working conditions, ensuring that the centrifugal pump is put into operation stably and efficiently, and improving work efficiency and reliability.

[0010] By utilizing the self-sealing characteristics of the gas-liquid mixture at the main impeller outlet, the separator is placed at the outlet position, cleverly avoiding the external water tank or external water operation usually required for vacuum devices, simplifying the external conditions required for equipment operation and reducing the complexity of use.

[0011] By adding a vacuum self-priming impeller and an outlet liquid separation tank, two effective internal circulation solutions are constructed, which stably and reliably ensure the self-supply of water to the vacuum self-priming impeller and the sealing link, allowing the entire system to operate independently and smoothly without the need for additional complex external water supply control, further improving the convenience and stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a vacuum self-priming centrifugal pump is shown.

[0013] Figure 2 A schematic diagram of the vacuum self-priming structure is shown.

[0014] Figure 3 A schematic diagram of the vacuum pump cover structure is shown.

[0015] Figure markings: 1. Vacuum shell, 2. Vacuum self-priming impeller, 3. Vacuum pump cover, 4. Outlet separator tank, 5. Negative pressure suction hole, 6. High pressure exhaust hole, 7. Upper exhaust port, 8. Water injection port, 9. Reflux port, 10. Flushing port, 11. Pump body outlet, 12. Centrifugal pump, 13. Air hole, 14. Baffle. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0017] The utility model proposes a vacuum self-priming centrifugal pump, comprising a centrifugal pump 12, wherein a vacuum pump cover 3 is installed on one side of a main impeller of the centrifugal pump 12, the vacuum pump cover 3 is connected to a vacuum shell 1 through a stud, and together they constitute an eccentric cavity, a vacuum self-priming impeller 2 is installed in the cavity, the groove of the vacuum self-priming impeller 2 is arranged eccentrically upward, a negative pressure suction hole 5 is opened in the low-pressure area of ​​the vacuum shell 1, a high-pressure exhaust hole 6 is opened in the high-pressure area of ​​the vacuum shell 1, and the vacuum pump cover 3 is provided with an air hole 13 communicating with the pump cavity on the side close to the low-pressure area; the air hole 13 cooperates with the vacuum shell 1 to exert the vacuum suction function.

[0018] The inlet of the centrifugal pump 12 is provided with a U-shaped tube to prevent liquid from being sucked back. The centrifugal pump 12 will suck back the liquid in the pump body when it stops. The U-shaped tube is installed at the inlet to ensure that the position of the outlet separator 4 is lower than the U-shaped tube, so as to prevent the water from being sucked back from the inlet of the centrifugal pump 12 and to ensure that the water required for self-priming is retained in the pump when it is restarted. The outlet of the centrifugal pump 12 is equipped with an outlet separator 4 through a flange. The outlet separator 4 effectively prevents gas from flowing back from the outlet by mixing gas and water at the outer edge of the main impeller. The liquid inlet of the outlet separator 4 is provided with a baffle 14. The baffle 14 can perform gas-liquid separation operation on the outlet gas-water mixture. The setting height of the baffle 14 is between the water injection port 8 and the return port 9. The gas and liquid ejected by the main impeller will first hit the baffle 14 and will not be directly thrown out from the outlet. At the same time, the gas and liquid will be separated after hitting the baffle 14. A water injection port 8 and a reflux port 9 are provided on one side of the outlet liquid separator tank 4. The reflux port 9 is connected to the negative pressure suction hole 5 through a pipeline to realize specific liquid transmission. An upper exhaust port 7 is provided on the other side of the outlet liquid separator tank 4. The upper exhaust port 7 is connected to the high-pressure exhaust hole 6 through a pipeline for gas transportation and discharge.

[0019] In the high-pressure area, the gas-liquid mixture is discharged into the outlet separator tank 4. Due to gravity, the gas is discharged from the outlet separator tank 4, while the liquid sinks and flows back to the negative pressure suction port 5 in the low-pressure area of ​​the vacuum housing 1 through the return port 9. This connection method ensures that the gas can be continuously discharged and the liquid is not lost during the gas-liquid mixing cycle. Therefore, this design ensures that the self-priming process can be carried out without relying on an external water source.

[0020] A flushing port 10 is located at the top of the vacuum housing 1 and is connected to the pump outlet 11 via a pipeline, achieving a self-flushing effect. The vacuum self-priming impeller 2 is coaxially driven with the main impeller of the centrifugal pump 12 and interacts with the eccentric groove of the vacuum housing 1, causing internal volume changes. This creates a water circulation system that is both self-priming and has exhaust functions.

[0021] A specially designed vacuum pump cover 3 and vacuum housing 1 are sequentially added behind the conventional centrifugal pump impeller to form an eccentric cavity. A vacuum self-priming impeller 2 is installed in the cavity. The vacuum self-priming impeller 2 is coaxially driven with the centrifugal pump 12 main impellers, playing a role in generating negative pressure on the left side and high pressure on the right side. The low-pressure area is connected to the pump inlet and continuously inhales air, while the high-pressure area is connected to the pump outlet to discharge the gas-liquid mixture. The outlet separator 4 is connected to the pump body outlet by a flange and is connected to the vacuum housing 1 through a pipeline. After the gas-liquid mixture enters the outlet separator 4, the liquid sinks and accumulates at the bottom of the outlet separator 4 under the action of gravity. The liquid is sucked away by the low-pressure area of ​​the vacuum self-priming impeller 2 to participate in the self-circulation of water, and the gas is continuously discharged from the top. At the same time, the gas-liquid mixture at the main impeller outlet will directly hit the baffle 14 of the outlet separator 4 under the action of centrifugal force, and is also separated under the action of gravity, playing a role in double gas-liquid separation to achieve the effect of circulating water.

[0022] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0023] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0026] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A vacuum self-priming centrifugal pump, comprising a centrifugal pump (12), characterized in that: A vacuum pump cover (3) is installed on one side of the main impeller of the centrifugal pump (12), and the vacuum pump cover (3) is connected to the vacuum housing (1) through a stud, together forming an eccentric cavity, and a vacuum self-priming impeller (2) is installed in the cavity, a negative pressure suction hole (5) is opened in the low-pressure area of ​​the vacuum housing (1), and a high-pressure exhaust hole (6) is opened in the high-pressure area of ​​the vacuum housing (1), and an air hole (13) communicating with the pump cavity is opened on the side of the vacuum pump cover (3) close to the low-pressure area, and a U-shaped pipe is provided at the inlet of the centrifugal pump (12) to prevent liquid from being sucked back; An outlet of the centrifugal pump (12) is provided with an outlet liquid separator (4) via a flange, a baffle (14) is provided at the liquid inlet of the outlet liquid separator (4), a water injection port (8) and a reflux port (9) are provided on one side of the outlet liquid separator (4), the reflux port (9) is connected to the negative pressure air intake hole (5) via a pipeline, and an upper exhaust port (7) is provided on the other side of the outlet liquid separator (4), the upper exhaust port (7) is connected to the high-pressure exhaust hole (6) via a pipeline, thereby forming a water circulation system with vacuum self-priming and exhaust functions.

2. A vacuum self-priming centrifugal pump according to claim 1, characterized in that: A flushing port (10) is provided at the top end of the vacuum housing (1), and the flushing port (10) is connected to a pump body outlet (11) via a pipeline.

3. A vacuum self-priming centrifugal pump according to claim 1, characterized in that: The vacuum self-priming impeller (2) is coaxially driven with the main impeller of the centrifugal pump (12).

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