Horizontal multi-stage centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a horizontal multi-stage centrifugal pump which comprises a driving motor, a mounting frame, a pump body and a rotating shaft, the output end of the driving motor is coaxially and fixedly connected with the rotating shaft, a mounting barrel is coaxially arranged in the pump body, and a mounting cavity is formed between the pump body and the mounting barrel; the pump body is communicated with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with the mounting cavity, a liquid inlet inner pipe is coaxially arranged in the liquid inlet pipe, the liquid inlet inner pipe is communicated with the mounting cylinder, the rotating shaft is rotationally connected with the mounting cylinder and the pump body, two groups of impellers are coaxially arranged on the rotating shaft, and a sealing spacer is arranged between the two groups of impellers. The two ends of the mounting cylinder communicate with communicating pipes. Compared with the prior art, the centrifugal pump has the advantages that in the process that the impeller just starts to convey fluid, the bearing axial load difference value of the liquid inlet pipe end and the liquid outlet pipe end of the pump body is reduced, deviation and abrasion of the rotating shaft and the bearing are reduced, and the service life of the centrifugal pump is prolonged.

Description

Technical Field

[0001] The present application relates to the field of centrifugal pumps, and in particular to a horizontal multi-stage centrifugal pump. Background Art

[0002] Horizontal multi-stage centrifugal pumps are several single-stage centrifugal pumps connected in series. They utilize centrifugal force to increase liquid pressure and are characterized by high efficiency, a wide range of performance, safe and stable operation, low noise, long life, and easy installation and maintenance. They are used to transport clean water or other liquids with physical and chemical properties similar to water. They are primarily suitable for water supply and drainage in urban high-rise buildings, firefighting water, water supply and drainage in factories and mines, long-distance water transportation, water used in production process circulation, HVAC circulation, and domestic water.

[0003] Referring to the Chinese patent application with publication number CN213870328U, a horizontal multi-stage segmented stainless steel centrifugal pump is disclosed. The water inlet is provided with a filter barrel, which is composed of a filter cartridge and a filter plate. A positioning protrusion is provided at the water inlet. A screw is fixed to the main shaft, and the filter plate has a through hole. After the screw passes through the through hole, it is fixed by screwing on a nut. A driving member can provide power to the rotating member so that the rotating member drives the actuator wrench to rotate. A replaceable and cleanable filter barrel is installed at the water inlet to intercept some fixed impurities and particles, greatly reducing the probability of deposition in the pump body.

[0004] However, in the prior art, since the horizontal multi-stage centrifugal pump has more impeller groups and a larger volume, and the liquid inlet pipe and liquid outlet pipe of the pump body are respectively arranged at both ends of the pump body, when the impeller starts to transport the fluid, the rotating shaft and bearings at the liquid inlet pipe end of the pump body are subjected to a larger axial load due to the gravity of the fluid than the rotating shaft and bearings at the liquid outlet pipe end of the pump body. Long-term operation will accelerate the deviation and wear of the rotating shaft and bearings, which may leave safety hazards during operation and cause economic losses. For this reason, we have designed a horizontal multi-stage centrifugal pump. Utility Model Content

[0005] A horizontal multi-stage centrifugal pump provided in an embodiment of the present application can reduce the difference in axial load of the bearings at the liquid inlet pipe end and the liquid outlet pipe end of the pump body, thereby alleviating the technical problems of offset and wear between the rotating shaft and the bearings.

[0006] The embodiment of the present application provides a horizontal multi-stage centrifugal pump comprising a drive motor, a mounting frame, a pump body and a rotating shaft, wherein the output end of the drive motor is coaxially fixedly connected to the rotating shaft, a mounting cylinder is coaxially provided within the pump body, a mounting cavity is provided between the pump body and the mounting cylinder, a liquid inlet pipe and a liquid outlet pipe are connected to the pump body, the liquid inlet pipe is connected to the mounting cavity, a liquid inlet inner pipe is coaxially provided within the liquid inlet pipe, the liquid inlet inner pipe is connected to the mounting cylinder, the rotating shaft is rotatably connected to the mounting cylinder and the pump body, two sets of impellers are coaxially provided on the rotating shaft, a sealing spacer is provided between the two sets of impellers, and a connecting pipe is connected at both ends of the mounting cylinder;

[0007] The output end of the driving motor drives the rotating shaft to rotate, so that the fluid enters the installation cavity and the installation cylinder respectively through the liquid inlet pipe and the liquid inlet inner pipe. The fluid entering the installation cylinder is pressurized and transported by the impeller, and is transported from one end of the sealing spacer to the end of the pump body away from the driving motor. Then, it enters the end of the installation cylinder close to the driving motor through the connecting pipe, and is then pressurized and transported to the other side of the sealing spacer by the impeller, and finally flows out through the liquid outlet pipe.

[0008] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0009] 1. In the present application, the fluid entering the installation cylinder is conveyed from one end of the sealing spacer to the end of the pump body away from the drive motor through the boost pressure of the impeller, and then enters the end of the installation cylinder close to the drive motor through the connecting pipe, and is then conveyed to the other side of the sealing spacer through the boost pressure of the impeller, and finally flows out through the liquid outlet pipe. Compared with the existing technology, the difference in the axial load of the bearings at the liquid inlet pipe end and the liquid outlet pipe end of the pump body is reduced, thereby reducing the displacement and wear of the rotating shaft and the bearing.

[0010] 2. The present application sets up the installation cavity, which makes it convenient for the fluid to enter the installation cavity through the liquid inlet pipe, and makes it convenient for the fluid to cover the installation cylinder, thereby providing a certain supporting effect on the rotating shaft and bearings of the pump body, reducing the displacement and wear of the rotating shaft and bearings to a certain extent, and facilitating the installation of the connecting pipe. Furthermore, the end of the liquid inlet pipe is set downward, and the liquid inlet port is provided on the side wall of the liquid inlet inner pipe located in the installation cavity, so as to facilitate the fluid in the installation cavity to enter the installation cylinder, thereby avoiding unnecessary waste of resources.

[0011] In some embodiments, the connecting pipe is disposed in the installation cavity.

[0012] In some embodiments, the sealing spacer is provided in a disc shape, and the sealing spacer divides the mounting cylinder into a left chamber and a right chamber.

[0013] In some embodiments, one end of the connecting tube is connected to the left chamber, and the other end is connected to the right chamber, and the liquid inlet inner tube and the liquid outlet tube are respectively arranged on both sides of the sealing septum.

[0014] In some embodiments, the ends of the liquid inlet pipe and the liquid outlet pipe away from the pump body are both connected to flange connection plates.

[0015] In some embodiments, the mounting frame is provided with a plurality of pressure rods, and the mounting frame is provided with a plurality of bolt mounting holes. The ends of the plurality of pressure rods are coaxially fixedly connected with bolt rods, and the bolt rods are inserted into the bolt mounting holes. The ends of the pressure rods are provided with mounting nuts, and the plurality of pressure rods are evenly arranged on the outside of the pump body.

[0016] In some embodiments, a mounting base is provided below the drive motor and the pump body, a plurality of support pads are provided on the mounting base, and the drive motor and the pump body are respectively arranged on the mounting base via the plurality of support pads. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic structural diagram of a horizontal multi-stage centrifugal pump provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the pump body structure of a horizontal multi-stage centrifugal pump provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the internal structure of a horizontal multi-stage centrifugal pump provided in an embodiment of the present application;

[0021] Figure 4 A side view of a pump body of a horizontal multi-stage centrifugal pump provided in an embodiment of the present application;

[0022] Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0023] Among them, the reference numerals in the figures are:

[0024] 1. Drive motor; 2. Mounting frame; 3. Pump body; 4. Mounting chamber; 5. Liquid inlet pipe; 6. Liquid inlet inner pipe; 7. Rotating shaft; 8. Impeller; 9. Sealing spacer; 10. Connecting pipe; 11. Liquid outlet pipe; 12. Pressure rod; 13. Mounting nut; 14. Mounting base. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions.

[0027] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0030] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0031] It should be noted that, in this application, words such as "in this embodiment", "exemplarily", and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in this embodiment", "exemplarily", and "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in this embodiment", "exemplarily", and "for example" is intended to present related concepts in a concrete way, meaning that specific features, structures, or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] Horizontal multi-stage centrifugal pumps are several single-stage centrifugal pumps connected in series. They use centrifugal force to increase the pressure of liquids. They have the characteristics of high efficiency, wide performance range, safe and stable operation, low noise, long life, and easy installation and maintenance. They are used to transport clean water or other liquids with physical and chemical properties similar to water. They are mainly suitable for water supply and drainage of urban high-rise buildings, fire water, water supply and drainage of factories and mines, long-distance water transmission, water used in production process circulation, HVAC circulation, domestic water, and many other purposes.

[0033] A horizontal multi-stage segmented stainless steel centrifugal pump in the related technology has a filter barrel installed in the water inlet, the filter barrel consists of a filter cartridge and a filter plate, and a positioning protrusion is provided at the water inlet; a screw is fixed to the main shaft, and a through hole is opened on the filter plate, which is fixed by screwing on a nut after the screw passes through the through hole; the driving part can provide power to the rotating part so that the rotating part drives the actuator wrench to rotate; a replaceable and cleanable filter barrel is installed at the water inlet, which can intercept a part of fixed impurities and particles, greatly reducing the chance of deposition in the pump body.

[0034] Based on this, in order to improve the problem in the related technology that the horizontal multi-stage centrifugal pump has more impeller groups and a larger volume, and the liquid inlet pipe and liquid outlet pipe of the pump body are respectively arranged at both ends of the pump body, when the impeller just starts to transport the fluid, the rotating shaft and bearings at the liquid inlet pipe end of the pump body are subjected to a larger axial load due to the gravity of the fluid compared to the rotating shaft and bearings at the liquid outlet pipe end of the pump body. Long-term operation will accelerate the displacement and wear of the rotating shaft and bearings, which may leave safety hazards during work and cause economic losses. The embodiment of the present application provides the following solution.

[0035] See also Figures 1 to 5A horizontal multi-stage centrifugal pump includes a driving motor 1, a mounting frame 2, a pump body 3 and a rotating shaft 7. The output end of the driving motor 1 is coaxially fixedly connected to the rotating shaft 7. A mounting cylinder is coaxially provided in the pump body 3. A mounting cavity 4 is provided between the pump body 3 and the mounting cylinder. A liquid inlet pipe 5 and a liquid outlet pipe 11 are connected on the pump body 3. The liquid inlet pipe 5 is connected to the mounting cavity 4. A liquid inlet inner pipe 6 is coaxially provided in the liquid inlet pipe 5. The liquid inlet inner pipe 6 is connected to the mounting cylinder. The rotating shaft 7 is rotatably connected to the mounting cylinder and the pump body 3. Two sets of impellers 8 are coaxially provided on the rotating shaft 7. A sealing spacer 9 is provided between the two sets of impellers 8. A connecting pipe 10 is connected at both ends of the mounting cylinder. The connecting pipe 10 is arranged in the mounting cavity 4.

[0036] The effect of this arrangement is that when the fluid enters the installation cavity 4 through the liquid inlet pipe 5, the fluid covers the installation cylinder, which has a certain supporting effect on the rotating shaft 7 and the bearing, reducing the offset and wear of the rotating shaft 7 and the bearing to a certain extent, and facilitating the installation of the connecting pipe 10. Compared with the existing technology, it avoids the rotating shaft 7 and the bearing at the liquid inlet pipe 5 end of the pump body 3 from being subjected to a larger axial load due to the gravity of the fluid than the rotating shaft 7 and the bearing at the liquid outlet pipe 11 end of the pump body 3 during the initial delivery of the fluid by the impeller 8, thereby reducing the offset and wear of the rotating shaft 7 and the bearing, and improving the service life of the horizontal multi-stage centrifugal pump.

[0037] See also Figure 3 and Figure 5 The sealing septum 9 is disc-shaped and divides the mounting tube into a left chamber and a right chamber. One end of the connecting pipe 10 is connected to the left chamber, and the other end is connected to the right chamber. The liquid inlet inner tube 6 and the liquid outlet tube 11 are respectively arranged on both sides of the sealing septum 9;

[0038] The effect of this arrangement is to facilitate the separation of the installation cylinder into two independent spaces through the sealing spacer 9, and the left chamber and the right chamber are connected by the connecting pipe 10. The fluid entering the installation cylinder is transported from one end of the sealing spacer 9 to the end of the pump body 3 away from the drive motor 1 through the booster of the impeller 8, and then enters the end of the installation cylinder close to the drive motor 1 through the connecting pipe 10, and then is transported to the other side of the sealing spacer 9 through the booster of the impeller 8, and finally flows out from the liquid outlet pipe 11.

[0039] See also Figure 3 and Figure 5 , the end of the liquid inlet pipe 5 is arranged downward, and the liquid inlet inner pipe 6 is located on the side wall of the installation cavity 4 to open a liquid inlet;

[0040] The effect of such arrangement is that when the horizontal multi-stage centrifugal pump is about to stop working, the fluid in the installation cavity 4 enters the installation cylinder through the liquid inlet under the action of gravity, thereby avoiding unnecessary waste of fluid.

[0041] See also Figure 1 and Figure 3, the ends of the liquid inlet pipe 5 and the liquid outlet pipe 11 away from the pump body 3 are connected to flange connection plates;

[0042] The effect of such an arrangement is to connect the pump body 3 with the external communication pipeline through a set of flange connection plates and mounting bolts, thereby facilitating the delivery of fluid.

[0043] See also Figure 1 , a plurality of pressure rods 12 are provided on the mounting frame 2, a plurality of bolt mounting holes are opened on the mounting frame 2, the ends of the plurality of pressure rods 12 are coaxially fixedly connected with bolt rods, the bolt rods are inserted into the bolt mounting holes, the ends of the pressure rods 12 are provided with mounting nuts 13, and the plurality of pressure rods 12 are evenly arranged on the outside of the pump body 3;

[0044] The effect of such an arrangement is that, by providing multiple groups of compression rods 12 , the pump body 3 is easily installed stably, and vibration of the entire device under the drive of the drive motor 1 is prevented, which would affect the normal operation of the horizontal multi-stage centrifugal pump.

[0045] See also Figure 1 , a mounting base 14 is provided below the driving motor 1 and the pump body 3, and a plurality of supporting pads are provided on the mounting base 14, and the driving motor 1 and the pump body 3 are respectively arranged on the mounting base 14 through the plurality of supporting pads;

[0046] The effect of such an arrangement is to provide stable support for the pump body 3 and the drive motor 1, thereby preventing the pump body 3 and the drive motor 1 from deviating from each other due to their own vibrations during operation.

[0047] From the above, we can see that the working principle of this application is as follows:

[0048] By providing an installation cavity 4 in the pump body 3, and the liquid inlet pipe 5 and the liquid outlet pipe 11 on the pump body 3 are both arranged in the middle of the pump body 3, the fluid enters the installation cavity 4 and the interior of the installation cylinder through the liquid inlet pipe 5 and the liquid inlet inner pipe 6 respectively. The fluid entering the interior of the installation cylinder is transported from one end of the sealing diaphragm 9 to the end of the pump body 3 away from the drive motor 1 through the impeller 8, and then enters the end of the installation cylinder close to the drive motor 1 through the connecting pipe 10, and is then transported to the other side of the sealing diaphragm 9 through the impeller 8, and finally flows out through the liquid outlet pipe 11;

[0049] The fluid enters the installation cavity 4 through the liquid inlet pipe 5, which facilitates the fluid to cover the installation cylinder, and has a certain supporting effect on the rotating shaft 7 and the bearing of the pump body 3, reducing the displacement and wear of the rotating shaft 7 and the bearing to a certain extent, and facilitating the installation of the connecting pipe 10. By setting the end of the liquid inlet pipe 5 downward and opening a liquid inlet on the side wall of the liquid inlet inner pipe 6 located in the installation cavity 4, the fluid in the installation cavity 4 can enter the installation cylinder.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A horizontal multistage centrifugal pump, comprising a drive motor (1), a mounting frame (2), a pump body (3) and a rotating shaft (7), characterized in that: The output end of the driving motor (1) is coaxially fixedly connected to the rotating shaft (7); a mounting cylinder is coaxially arranged inside the pump body (3); a mounting cavity (4) is arranged between the pump body (3) and the mounting cylinder; a liquid inlet pipe (5) and a liquid outlet pipe (11) are connected to the pump body (3); the liquid inlet pipe (5) is connected to the mounting cavity (4); a liquid inlet inner pipe (6) is coaxially arranged inside the liquid inlet pipe (5); the liquid inlet inner pipe (6) is connected to the mounting cylinder; the rotating shaft (7) is rotatably connected to the mounting cylinder and the pump body (3); two groups of impellers (8) are coaxially arranged on the rotating shaft (7); a sealing spacer (9) is arranged between the two groups of impellers (8); and connecting pipes (10) are connected to both ends of the mounting cylinder.

2. A horizontal multistage centrifugal pump according to claim 1, characterized in that: The connecting pipe (10) is arranged in the installation cavity (4).

3. A horizontal multistage centrifugal pump according to claim 1, characterized in that: The sealing spacer (9) is arranged in a disc shape, and the sealing spacer (9) divides the installation cylinder into a left chamber and a right chamber.

4. A horizontal multistage centrifugal pump according to claim 3, characterized in that: One end of the connecting pipe (10) is connected to the left chamber, and the other end is connected to the right chamber. The liquid inlet inner pipe (6) and the liquid outlet pipe (11) are respectively arranged on both sides of the sealing spacer (9).

5. A horizontal multistage centrifugal pump according to claim 1, characterized in that: The ends of the liquid inlet pipe (5) and the liquid outlet pipe (11) which are away from the pump body (3) are both connected to flange connection plates.

6. A horizontal multistage centrifugal pump according to claim 1, characterized in that: The mounting frame (2) is provided with a plurality of pressure rods (12), and the mounting frame (2) is provided with a plurality of bolt mounting holes. The ends of the plurality of pressure rods (12) are coaxially fixedly connected with bolt rods, and the bolt rods are inserted into the bolt mounting holes. The ends of the pressure rods (12) are provided with mounting nuts (13), and the plurality of pressure rods (12) are evenly arranged on the outside of the pump body (3).

7. A horizontal multistage centrifugal pump according to claim 1, characterized in that: A mounting base (14) is provided below the drive motor (1) and the pump body (3), a plurality of support pads are provided on the mounting base (14), and the drive motor (1) and the pump body (3) are respectively arranged on the mounting base (14) via the plurality of support pads.

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