Compact double suction pump based on independent seals

Abstract

The utility model relates to a compact double -suction pump based on independent sealing body, including pump cover, impeller, shaft, pump body and sealing assembly, the impeller is fixed on the shaft, and the both sides of impeller install sealing assembly, sealing assembly includes sealing body, mechanical seal and bearing sealing unit, the pump cover and pump body are the structure that opens in the middle, and both sides are equipped with the installation cavity that cooperates with the shape of sealing body, the sealing body is fixed in the installation cavity, and with pump cover and pump body enclose into the pump chamber, the sealing body is set up on the shaft, the mechanical seal is installed in the connection position of sealing body near the one end of pump chamber and the shaft, the one end of sealing body away from pump chamber is equipped with bearing installation slot, and is installed on the shaft through bearing body, and is fixed on the sealing body, bearing sealing unit is used for the sealing of bearing body, compared with the prior art, the utility model has the advantages of stable operation, convenient maintenance, simple structure and low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of double-suction pumps, and in particular to a compact double-suction pump based on an independent sealing body. Background Technology

[0002] Double-suction pumps are widely used in industrial and daily life. Better cavitation performance results in lower civil engineering costs, longer service life, higher efficiency, and lower electricity costs, making them more energy-efficient and environmentally friendly. The suction chamber of a double-suction pump is typically a semi-spiral suction chamber. This chamber guides water horizontally from the pump inlet and then vertically into the impeller inlet. The water in the suction chamber should operate as steadily as possible to minimize friction losses.

[0003] Existing double-suction pumps consist of four main parts: pump body, pump cover, bearing components, and rotor components. They offer advantages such as high efficiency and reliability, convenient maintenance, and standardized components. They are widely used in municipal engineering, industrial systems, and water conservancy projects. Their structure is as follows: Figure 1 As shown.

[0004] For example, the utility model with publication number CN111536045A discloses a double-end-face adaptive shaft seal double-suction pump, including a double-suction pump body and a shaft. The double-suction pump body is assembled from a pump body and a pump cover. The pump body cavity of the pump body and the pump cover cavity of the pump cover together form a double-suction pump cavity. The shaft is fitted between the pump body and the pump cover. An impeller located in the double-suction pump cavity is installed on the shaft. Shaft seal cavities are provided on both sides of the double-suction pump body corresponding to the shaft. A shaft seal device is fitted in each shaft seal cavity corresponding to the shaft. A sealing cover corresponding to the shaft seal device is connected to the outside of the double-suction pump body. The sealing cover is fitted onto the shaft.

[0005] However, during use, the aforementioned dual-suction pumps often suffer from problems such as significant vibration, low volumetric efficiency, relatively thick shaft, high material consumption, and the need for additional cleaning components, which complicates the structure and increases costs. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art, such as large vibration and low volumetric efficiency, and to provide a compact double-suction pump based on an independent sealing body.

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

[0008] This solution provides a compact double-suction pump based on an independent seal body, including a pump cover, impeller, shaft, pump body and sealing assembly. The impeller is fixed on the shaft and sealing assemblies are installed on both sides of the impeller.

[0009] The sealing assembly includes a sealing body, a mechanical seal, and a bearing sealing unit; the pump cover and pump body are of a split structure, and both sides are provided with mounting cavities that match the shape of the sealing body. The sealing body is fixed in the mounting cavity and together with the pump cover and pump body, forms a pump cavity.

[0010] The sealing body is sleeved on the shaft, and the mechanical seal is installed at the connection position between the sealing body and the shaft at the end of the sealing body near the pump cavity; the end of the sealing body away from the pump cavity is provided with a bearing mounting groove, and is installed on the shaft through a bearing body and fixed on the sealing body, and the bearing sealing unit is used for sealing the bearing body.

[0011] Preferably, the sealing body has a sealing mounting groove that mates with the mechanical seal at one end near the pump cavity, and the mechanical seal has a mechanical seal retaining ring on the side away from the sealing body, and the mechanical seal retaining ring is fixed on the shaft.

[0012] Preferably, the moving ring of the mechanical seal abuts against the mechanical seal retaining ring, and a VD-type sealing ring is provided at the bottom of the sealing mounting groove, the VD-type sealing ring being sleeved on the shaft.

[0013] Preferably, the pump cover has a flushing groove on its open surface, the outer side of the sealing body has an annular groove, and the bottom of the annular groove has a flushing hole; one end of the flushing groove is connected to the discharge chamber and the other end is connected to the annular groove, one end of the flushing hole is connected to the annular groove and the other end is connected to the sealing mounting groove, and faces the moving ring of the mechanical seal.

[0014] Preferably, the end of the sealing body away from the pump cavity is provided with a gland mounting groove, a sealing gland is installed in the gland mounting groove, the inner ring of the sealing gland is sleeved on the shaft, and the outer ring is transitionally fitted with the gland mounting groove.

[0015] Preferably, the bearing body is mounted on the sealing body by bolts, the upper end of the bearing body is provided with an oil injection hole, the oil injection hole is connected to the side of the bearing body close to the sealing body, and the lower end of the bearing body is provided with an oil outlet hole, the oil outlet hole is connected to the side of the bearing body away from the sealing body.

[0016] Preferably, the impeller is mounted on a shaft via a key connection, and two shaft sleeve nuts are mounted on the shaft. The two shaft sleeve nuts are symmetrically distributed on both sides of the impeller and abut against the impeller.

[0017] Preferably, the connection between the sealing body and the pump cover and the pump body is provided with an O-ring, and the connection between the impeller and the pump cover and the pump body is provided with an O-ring and a double-stop sealing ring.

[0018] Preferably, the sealing body is a rotating body structure, the outer side of the sealing body is provided with a partition plate, the partition plate is located in the suction chamber, and the hydraulic diagram of the pressure chamber of the double suction pump is a rectangular volute structure.

[0019] Preferably, the hydraulic diagram of the pressure chamber of the dual-suction pump is a rectangular volute structure.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) In this design, the pump body and pump cover are designed to fit together in a split-type structure, with two sealing bodies installed in the mounting cavities on both sides. The three components work together to form the pump chamber. Compared to traditional sealing structures that are completely located outside the pump body and pump cover, this design improves the compactness of the structure. The two sealing bodies are respectively located on opposite sides of the impeller, forming a centrally symmetrical structure. The hydraulic diagram of the discharge chamber uses a rectangular volute, which shortens the shaft as much as possible and reduces the span between bearings. This design reduces deflection, makes the structure more stable, and reduces the probability of shaft breakage. At the same time, it also significantly improves vibration and noise. The overall maximum size is reduced, saving installation space and lowering costs.

[0022] (2) In this design, a flushing groove is directly cast on the open surface of the pump cover, and an annular groove is machined around the outer circle of the seal body. A flushing hole is drilled on the annular groove, reaching the circumferential surface parallel to the mechanical seal's moving ring. The medium is gradually pressurized and flows directly from the discharge chamber into the flushing groove cast on the open surface of the pump cover. It then flows through the annular groove into the machined hole and finally flows back to the suction chamber, thus achieving the effect of flushing the mechanical seal. This design eliminates the need for external flushing pipelines, which not only reduces costs but also saves space.

[0023] (3) The sealing body in this scheme is applicable to different models of double-suction pumps in the same shaft system, with a wide range of applications. Moreover, the mechanical seal cover is removed, the bearing components are simplified, the mechanical seal flushing structure is changed, and the material and processing costs of the parts are saved. It has good economic benefits in mass production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an existing double-suction pump.

[0025] Figure 2 This is a schematic diagram of the structure of the double-suction pump of this utility model.

[0026] Figure 3 This is a side view of the double-suction pump of this utility model.

[0027] Figure 4 This is a planar schematic diagram of the sealing body of this utility model.

[0028] Figure 5 This is a three-dimensional schematic diagram of the sealing body of this utility model.

[0029] Figure 6 This is a schematic diagram of the general components of the double-suction pump of this utility model.

[0030] Figure 7 This is a schematic diagram of the inner side structure of the pump cover of this utility model.

[0031] In the diagram: 1. Bearing housing; 101. Oil injection hole; 102. Oil outlet hole; 2. Sealing gland; 3. Sealing body; 301. Sealing mounting groove; 302. Annular groove; 303. Flushing hole; 304. Gland mounting groove; 305. Partition plate; 4. Pump cover; 401. Flushing groove; 5. Double stop seal ring; 6. Impeller; 7. Shaft sleeve nut; 8. Mechanical seal retaining ring; 9. Shaft; 10. Pump body; 11. Mechanical seal; 12. Key; 13. O-ring seal; 14. VD-type seal; 15. Bearing gland; 16. Suction chamber; 17. Discharge chamber; 18. Pump cover center opening. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] It should be noted that 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] Example 1

[0039] like Figure 2 and Figure 6 As shown, this embodiment provides a compact double-suction pump based on an independent seal body, including a pump cover 4, an impeller 6, a shaft 9, a pump body 10, and a sealing assembly. The impeller 6 is fixed on the shaft 9, and sealing assemblies are installed on both sides of the impeller 6.

[0040] The sealing assembly includes a sealing body 3, a mechanical seal 11, and a bearing sealing unit; the pump cover 4 and the pump body 10 are open-center structures, and mounting cavities that match the shape of the sealing body 3 are provided on both sides. The sealing body 3 is fixed in the mounting cavity and together with the pump cover 4 and the pump body 10 form a pump cavity.

[0041] The sealing body 3 is sleeved on the shaft 9, and the mechanical seal 11 is installed at the connection position between the sealing body 3 and the shaft 9 at the end near the pump cavity. The end of the sealing body 3 away from the pump cavity is provided with a bearing mounting groove, and is installed on the shaft 9 through the bearing body 1 and fixed on the sealing body 3. The bearing sealing unit is used for sealing the bearing body 1.

[0042] In this embodiment, as Figure 3 As shown, the sealing body 3 is a rotating structure, and a partition plate 305 is provided on the outer side of the sealing body 3. The partition plate 305 is located in the suction chamber 16. The hydraulic diagram of the pressure chamber 17 of the double suction pump is a rectangular volute structure. The hydraulic diagram of the discharge chamber adopts a rectangular volute, which shortens the span between the bearings. This design reduces deflection and lowers the probability of shaft breakage. The lower center of gravity also makes the structure more stable. The hydraulic diagram of the suction chamber places the partition plate in the middle, making the two sealing bodies interchangeable.

[0043] The pump body and pump cover feature a split-type structure with mutual fitting, and two sealing bodies are installed in the mounting cavities on both sides, forming the pump chamber. Compared to traditional sealing structures that are completely outside the pump body and pump cover, this design improves structural compactness. The two sealing bodies are respectively located on opposite sides of the impeller, creating a centrally symmetrical structure. The hydraulic diagram of the discharge chamber uses a rectangular volute, minimizing shaft length and reducing bearing spacing. This design reduces deflection, making the structure more stable and lowering the probability of shaft breakage. It also significantly improves vibration and noise levels. The overall reduction in maximum size saves installation space and lowers costs.

[0044] In this embodiment, as Figure 4 As shown, the sealing body 3 has a sealing mounting groove 301 at one end near the pump chamber that mates with the mechanical seal 11. The mechanical seal 11 has a mechanical seal retaining ring 8 on the side away from the sealing body 3, and the mechanical seal retaining ring 8 is fixed on the shaft 9. The moving ring of the mechanical seal 11 abuts against the mechanical seal retaining ring 8. A VD-type sealing ring 14 is provided at the bottom of the sealing mounting groove 301, and the VD-type sealing ring 14 is fitted onto the shaft 9.

[0045] Preferred implementation methods, such as Figure 7 As shown, a flushing groove 401 is provided on the open face 18 of the pump cover 4, and an annular groove 302 is provided on the outer side of the sealing body 3. A flushing hole 303 is provided at the bottom of the annular groove 302. One end of the flushing groove 401 is connected to the discharge chamber 17, and the other end is connected to the annular groove 302. One end of the flushing hole 303 is connected to the annular groove 302, and the other end is connected to the sealing mounting groove 301, and faces the moving ring of the mechanical seal 11.

[0046] Specifically, a flushing groove 401 is directly cast on the open face 18 of the pump cover. An annular groove 302 encircling the outer circle of the seal body 3 is machined, and flushing holes 303 are drilled on the annular groove 302, reaching the circumferential surface parallel to the mechanical seal's moving ring. The medium is gradually pressurized and flows directly from the discharge chamber 17 into the flushing groove 401 cast on the open face 18 of the pump cover. After passing through the annular groove 302, it flows into the flushing hole 303 and finally flows back to the suction chamber 16, flowing in the following direction: Figure 7 As shown in the diagram, this design achieves the effect of flushing the machine seal, eliminating the need for external flushing pipes, which not only reduces costs but also saves space.

[0047] By directly casting a flushing groove on the open surface of the pump cover, machining an annular groove around the outer circle of the seal body, and drilling flushing holes on the annular groove, reaching the circumferential surface parallel to the moving ring of the mechanical seal, the medium is gradually pressurized and flows directly from the discharge chamber into the flushing groove cast on the open surface of the pump cover, flows through the annular groove into the machined hole, and finally flows back to the suction chamber, thereby achieving the effect of flushing the mechanical seal. This design eliminates the need for external flushing pipelines, which not only reduces costs but also saves space.

[0048] In this embodiment, the end of the sealing body 3 away from the pump cavity is provided with a gland mounting groove 304. A sealing gland 2 is installed in the gland mounting groove 304. The inner ring of the sealing gland 2 is sleeved on the shaft 9, and the outer ring is transitionally fitted with the gland mounting groove 304. The bearing body 1 is installed on the sealing body 3 by bolts. The upper end of the bearing body 1 is provided with an oil injection hole 101, which connects to the side of the bearing body 1 near the sealing body 3. The lower end of the bearing body 1 is provided with an oil outlet hole 102, which connects to the side of the bearing body 1 away from the sealing body 3.

[0049] Specifically, such as Figure 2-6 As shown, the sealing body 3 is a rotating structure that rotates around its central axis. It is fitted onto the outside of the mechanical seal, and the suction chamber partition is mounted on the sealing body 3. Together with the pump body 10 and pump cover 4, they form the pump cavity, and are respectively located on opposite sides of the impeller 6. This design makes the rotor components have a centrally symmetrical structure, which is suitable for different models of double-suction pumps in the same shaft system. The pump cavity is in a sealed state, which avoids media leakage and improves the service life of the pump. The sealing gland 2 is located between the bearing body 1 and the sealing body 3, and adopts a transition fit with the sealing body 3 to seal the gap between the shaft 9 and the sealing body 3.

[0050] In this embodiment, the bearing body 1 also adopts a rotating body structure that rotates around the central axis, is mounted on the rotating shaft, and is bolted to the sealing body. The bolt connection position adopts a petal shape, and the blanks of the two bearing bodies 1 are shared. This design improves the stability of the overall structure while saving materials. The sealing body 3, bearing body 1, and other parts can be used for multiple different models of double-suction pumps in the same shaft system. This design saves the cost of mold making.

[0051] In this embodiment, the impeller 6 is mounted on the shaft 9 via a key connection. Two bushing nuts 7 are mounted on the shaft 9, symmetrically distributed on both sides of the impeller 6 and abutting against the impeller 6. O-ring seals 13 are provided at the connection points between the sealing body 3 and the pump cover 4 and the pump body 10. O-ring seals 13 and double-stop seal rings 5 ​​are also provided at the connection points between the impeller 6 and the pump cover 4 and the pump body 10.

[0052] In this embodiment, when the double-suction pump is working, the pump rotor drives the impeller to rotate and do work on the medium. The medium flows from the suction chamber into the impeller and gradually increases in pressure, and the medium energy increases accordingly. The pump converts mechanical energy into the energy of the medium. When the medium is pressurized from both sides of the impeller and enters the discharge chamber, the static pressure reaches its maximum peak value in the discharge chamber, which is consistent with the working principle of the double-suction pump.

[0053] Given the split-type design of the pump body and pump cover, this design significantly improves the ease of maintenance. When pump maintenance or parts replacement is required, technicians can easily remove the pump cover from the pump body. This design allows the internal components of the pump chamber to be directly exposed to maintenance personnel, greatly facilitating inspection, cleaning, replacement, and repair.

[0054] In this embodiment, the double-suction pump eliminates the packing seal, shortens the bearing spacing, reduces weight, saves axial installation space, and relatively reduces vibration, thus saving pump materials while improving reliability. It is applicable to all operating conditions of the original double-suction pump.

[0055] Specifically, this embodiment provides an assembly method for a highly reliable compact double-suction pump, which includes: a bearing body 1, a sealing gland 2, a sealing body 3, a pump cover 4, a double-stop sealing ring 5, an impeller 6, a shaft sleeve nut 7, a mechanical seal retaining ring 8, a shaft 9, a pump body 10, a mechanical seal 11, a key 12, an O-ring seal 13, a VD-type sealing ring 14, and a bearing gland 15.

[0056] Shaft sleeve nuts 7 are respectively located on both sides of the impeller 6. The impeller 6 is fixed to the shaft 9 by adjusting the shaft sleeve nuts 7. O-ring seals 13 are respectively fitted onto the sealing body 3 and the double stop sealing ring 5 to ensure sealing effect. The mechanical seal retaining ring 8 is fixed to the shaft 9 with set screws, and then the mechanical seal 12 and sealing body 3 (see details) are installed. Figure 4-5 The VD-type sealing ring 14 and the sealing gland 2 are installed on the shaft 9 in sequence. The bearing body 1 and the sealing body 3 are tightly connected by bolts. Then, the double stop sealing ring 5 is installed. The rotor component can be directly assembled onto the pump body 10. The relative position of the impeller and the pump body is adjusted to ensure accuracy. Finally, the pump cover 4 is closed and the double-ended studs and nuts are tightened. At this point, the assembly of the entire pump is completed.

[0057] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A compact double-suction pump based on an independent seal, comprising a pump cover (4), an impeller (6), a shaft (9), a pump body (10), and a sealing assembly, characterized in that, The impeller (6) is fixed on the shaft (9), and sealing components are installed on both sides of the impeller (6); The sealing assembly includes a sealing body (3), a mechanical seal (11), and a bearing sealing unit; the pump cover (4) and the pump body (10) are open-center structures, and mounting cavities that match the shape of the sealing body (3) are provided on both sides. The sealing body (3) is fixed in the mounting cavity and forms a pump cavity with the pump cover (4) and the pump body (10). The sealing body (3) is sleeved on the shaft (9), and the mechanical seal (11) is installed at the connection position between the sealing body (3) and the shaft (9) at the end near the pump cavity; the sealing body (3) is provided with a bearing mounting groove at the end away from the pump cavity, and is installed on the shaft (9) through the bearing body (1) and fixed on the sealing body (3); the bearing sealing unit is used for sealing the bearing body (1).

2. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The sealing body (3) has a sealing mounting groove (301) that cooperates with the mechanical seal (11) at one end near the pump chamber. The mechanical seal (11) has a mechanical seal retaining ring (8) on the side away from the sealing body (3). The mechanical seal retaining ring (8) is fixed on the shaft (9).

3. A compact double-suction pump based on an independent seal body according to claim 2, characterized in that, The moving ring of the mechanical seal (11) abuts against the mechanical seal ring (8), and the bottom of the sealing mounting groove (301) is provided with a VD type sealing ring (14), which is sleeved on the shaft (9).

4. A compact double-suction pump based on an independent seal body according to claim 2, characterized in that, The pump cover (4) has a flushing groove (401) on its open face (18), and the sealing body (3) has an annular groove (302) on its outer side. The bottom of the annular groove (302) has a flushing hole (303). One end of the flushing groove (401) is connected to the discharge chamber (17), and the other end is connected to the annular groove (302). One end of the flushing hole (303) is connected to the annular groove (302), and the other end is connected to the sealing mounting groove (301), and faces the moving ring of the mechanical seal (11).

5. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The sealing body (3) has a gland mounting groove (304) at one end away from the pump cavity. A sealing gland (2) is installed in the gland mounting groove (304). The inner ring of the sealing gland (2) is sleeved on the shaft (9), and the outer ring is transitionally fitted with the gland mounting groove (304).

6. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The bearing body (1) is mounted on the sealing body (3) by bolts. The upper end of the bearing body (1) is provided with an oil injection hole (101), which is connected to the side of the bearing body (1) close to the sealing body (3). The lower end of the bearing body (1) is provided with an oil outlet hole (102), which is connected to the side of the bearing body (1) away from the sealing body (3).

7. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The impeller (6) is mounted on the shaft (9) by a key connection. Two bushing nuts (7) are mounted on the shaft (9). The two bushing nuts (7) are symmetrically distributed on both sides of the impeller (6) and abut against the impeller (6).

8. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The connection between the sealing body (3) and the pump cover (4) and the pump body (10) is provided with an O-ring (13), and the connection between the impeller (6) and the pump cover (4) and the pump body (10) is provided with an O-ring (13) and a double stop seal ring (5).

9. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The sealing body (3) is a rotating structure, and the outer side of the sealing body (3) is provided with a partition plate (305), which is located in the suction chamber (16).

10. A compact double-suction pump based on an independent seal body according to claim 1, characterized in that, The hydraulic diagram of the pressure chamber (17) of the double-suction pump is a rectangular volute structure.

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