Rotary jet pump with variable speed

Abstract

The utility model relates to a rotating injection pump of variable rotating speed belongs to non variable capacity pump technical field, the rotating injection pump of variable rotating speed includes shell, collecting liquid pipe, bearing box, hub, impeller, drive shaft, driven shaft, first transmission gear and second transmission gear, one end of shell connects the pump cover, the other end of shell connects bearing box, the outside of pump cover connects water inlet section and water outlet section, and the hub is arranged in the shell with impeller, and the cantilever end of collecting liquid pipe is located in rotor chamber, and the outlet pipe end of collecting liquid pipe is connected with water outlet section, and the first transmission gear is installed on drive shaft, and one end of driven shaft is connected with hub, and the second transmission gear is installed on the other end of driven shaft, and the first transmission gear and second transmission gear directly or indirectly engage transmission drive. The utility model discloses through replacing transmission gear to realize the increase and decrease of rotating speed, satisfy various work scene, the assembly method can ensure that each component of pump can be assembled together accurately to realize the high performance operation of pump.

Description

Technical Field

[0001] This utility model relates to a rotary jet pump with variable speed, belonging to the field of non-variable displacement pump technology. Background Technology

[0002] Rotary jet pumps, as high-efficiency fluid transport equipment, are widely used in various industrial fields such as chemical, petroleum, metallurgy, and water treatment. Rotary jet pumps have a wide speed adjustment range, typically covering from 1450 r / min to 5000 r / min, and some models can even reach 8000 r / min. This characteristic allows rotary jet pumps to flexibly adapt to the flow and pressure requirements under different operating conditions, improving the overall operating efficiency of the system.

[0003] However, a significant technical bottleneck in driving rotary jet pumps to achieve high-speed operation lies in the limitation of motor speed. Traditional high-speed motors, especially for industrial applications, generally operate at the standard speed of a two-stage motor, around 2950 r / min. Few motor manufacturers can provide motors exceeding 3600 r / min, which directly restricts the direct driving capability of rotary jet pumps in the high-speed range.

[0004] To overcome this technical challenge, the industry currently employs two main solutions: For rotary jet pumps with speed requirements not exceeding 3600 r / min, adjusting the motor speed using variable frequency technology is a common practice. Variable frequency motors achieve stepless speed regulation by changing the power supply frequency. While this can meet speed requirements to some extent, the variable frequency equipment itself is expensive, and its long-term energy consumption and maintenance costs are relatively high, impacting overall economic efficiency. For rotary jet pumps requiring higher speeds, speed increasers are typically used as intermediate transmission devices to convert the lower motor speed to the higher speed required by the rotary jet pump. Although this method effectively increases the rotary jet pump speed, the introduction of speed increasers not only increases the system's complexity and weight but also introduces additional energy losses and potential failure points. Furthermore, the speed increaser and its installation and maintenance costs further increase the overall investment.

[0005] Therefore, both using a variable frequency motor and a speed increaser significantly increase the cost of the rotary jet pump drive system. Moreover, the efficiency of a variable frequency motor decreases when running at high frequencies, while a speed increaser incurs additional mechanical losses, both of which reduce the overall energy efficiency of the drive system. Furthermore, the series connection of multiple components increases the probability of system failure, and the failure of any link may lead to the paralysis of the entire drive system, affecting production continuity.

[0006] Therefore, there is a need for a rotary jet pump that can directly drive a rotary jet pump to achieve high-speed operation while taking into account cost-effectiveness, energy efficiency and reliability.

[0007] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present invention, and therefore may include information that does not constitute prior art. Utility Model Content

[0008] The purpose of this utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0009] The technical solution provided by this utility model is as follows: A rotary jet pump with variable speed includes a housing, an outlet section, an inlet section, a bearing housing, a hub, an impeller, a drive shaft, a driven shaft, a first transmission gear, and a second transmission gear. One end of the housing is detachably connected to a pump cover, and the other end of the housing is connected to the bearing housing. The inlet section and the outlet section are sequentially connected to the outer side of the pump cover. The impeller and the hub are disposed inside the housing. The cantilever end of the liquid collecting pipe is located in the rotor cavity formed by the impeller and the hub. The outlet end of the liquid collecting pipe passes through the impeller and is connected to the outlet section. The drive shaft and the driven shaft are both mounted in the bearing housing through bearings. The first transmission gear is mounted on the drive shaft. One end of the driven shaft is connected to the hub, and the other end of the driven shaft is mounted with the second transmission gear. The first transmission gear and the second transmission gear mesh directly or indirectly.

[0010] Compared with the prior art, the technical solution provided by this utility model has the following advantages: This utility model installs a first transmission gear on the drive shaft, while the driven shaft is connected to the rotating hub and equipped with a second transmission gear. These two sets of gears can mesh directly or indirectly via an intermediate gear. Driven by a motor, the user can accurately calculate the relationship between the pump speed and the gear ratio according to actual working conditions, and increase or decrease the speed by changing the transmission gear, thus meeting diverse working scenarios. Furthermore, this utility model directly integrates the transmission gear into the bearing housing, which not only simplifies the overall structure and reduces complex connections between components, but also eliminates the need to purchase an additional speed increaser, thereby effectively reducing production and operating costs while ensuring performance.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, it also includes a sealing dynamic ring and a sealing stationary ring. The sealing stationary ring is sleeved on the liquid collecting pipe, and the sealing dynamic ring is installed on the impeller. The leakage point between the impeller and the liquid collecting pipe is sealed by the cooperation of the sealing dynamic ring and the sealing stationary ring.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the combined use of the sealing dynamic ring and the sealing stationary ring effectively prevents leakage of the working medium under high pressure or high speed flow, ensuring the stable operation and long-term reliability of the pump.

[0014] Furthermore, it also includes a bushing, which is connected to the impeller and is sleeved outside the outlet end of the liquid collecting pipe. The bushing and the liquid collecting pipe form a liquid inlet channel, which connects the water inlet section and the rotor cavity.

[0015] The beneficial effects of adopting the above-mentioned further solution are that the liquid inlet channel between the bushing and the liquid collecting pipe allows the water flow in the water inlet section to enter the rotor cavity directly and efficiently. The connection method between the bushing, the impeller, and the liquid collecting pipe also facilitates disassembly and maintenance when needed, reducing maintenance costs and time.

[0016] Furthermore, it also includes a motor, which is mounted outside the bearing housing and connected to the drive shaft.

[0017] Furthermore, the bearing housing is provided with a water-cooling cover, and the bearing housing is provided with a water-cooling coil, which is used to cool the gears and bearings inside the bearing housing.

[0018] The beneficial effect of adopting the above-mentioned further solution is that high temperature environment will accelerate the wear of gears and bearings and reduce their service life. By cooling with water cooling coils, the internal temperature of the bearing housing can be kept within a suitable range, thereby slowing down the wear rate of gears and bearings and extending their service life.

[0019] This utility model also provides the following technical solution: an assembly method for a rotary jet pump with variable speed, comprising the following steps:

[0020] Drive shaft installation steps: Install the first bearing and the first transmission gear onto the drive shaft and use a retaining ring for positioning; install the assembled drive shaft into the bearing housing from the motor side, wherein the bearing housing is provided with a first positioning platform for positioning the first bearing; after the first bearing is installed in place, install the drive-side bearing cover to complete the fixation of the drive shaft;

[0021] Driven shaft installation steps: First, put the non-drive side bearing cover on the driven shaft; then pass the driven shaft through the second bearing and the second transmission gear in sequence and install the nut, and then use the retaining ring to fix the second transmission gear; install the integrated driven shaft into the bearing housing from the non-drive end of the bearing housing, and use the second positioning table on the bearing housing to position the bearing; after the second bearing is installed in place, fix the non-drive side bearing cover.

[0022] Installation steps for remaining parts: Install the rotating hub onto the driven shaft; place the sealing stationary ring onto the liquid collecting pipe and position the liquid collecting pipe inside the rotating hub cavity; use pins to secure the sealing moving ring on the impeller, then connect the impeller to the rotating hub; connect the shaft sleeve to the impeller; install the sealing components on the shaft sleeve; connect the inlet section and the pump cover; fix the liquid collecting pipe to the inlet section to compress the sealing stationary ring and achieve a sealing effect; finally, connect the inlet section and the outlet section to complete the installation of the entire rotary jet pump.

[0023] Compared with existing technologies, the technical solution provided by this utility model has the following beneficial effects: The variable speed rotary jet pump assembly method proposed in this utility model can ensure that all components of the pump can be accurately assembled together, thereby achieving high-performance operation of the pump. Compared with existing technologies, the assembly method of this utility model significantly improves the accuracy and efficiency of assembly and reduces the risk of performance degradation or failure due to improper assembly. Specifically, this utility model first precisely installs the bearings and transmission gears onto the drive shaft and driven shaft, and uses a positioning table and fasteners to ensure accurate positioning and firm fixation of each component. Subsequently, key components such as the hub, impeller, and collecting pipe are assembled step by step, with special attention paid to achieving sealing performance during the process to ensure that the high-pressure fluid inside the pump body does not leak. Finally, the assembly of the entire pump is completed by connecting components such as the inlet section and outlet section. This not only simplifies the complex assembly process and improves the accuracy and efficiency of assembly, but also ensures the long-term stable operation of the pump through a refined sealing design. In addition, this method also considers the convenience of maintenance and repair, making it easy to replace and repair components during the use of the pump. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 The variable speed rotary jet pump of this utility model is used in... Figure 2 The structural schematic diagram is shown from the indicated A-direction view.

[0026] Figure 2 For the present utility model Figure 1 A half-section view along the K1-K1 direction;

[0027] Figure 3 For the present utility model Figure 1 A half-section view along the K2-K2 direction;

[0028] Figure 4 For the present utility model Figure 3 A schematic diagram of the enlarged structure of part B;

[0029] In the diagram, 1. Outlet section; 2. Inlet section; 3. Collector pipe; 4. Shaft sleeve; 5. Pump cover; 6. Impeller; 7. Hub; 8. Non-drive side bearing cover; 9. Bearing housing; 10. Drive side bearing cover; 11. Driven shaft; 12. Second transmission gear; 13. First transmission gear; 14. Drive shaft; 15. Sealing ring; 16. Sealing ring; 17. Water-cooled cover; 18. Outer shell. Detailed Implementation

[0030] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the objects described and do not imply any priority in order or any specific technical meaning. Furthermore, the concepts of "connection" and "linkage" mentioned in this application, unless otherwise specified, are considered to include both direct connection (linkage) and indirect connection (linkage).

[0031] When interpreting the description of this application, it should be clarified that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating directions or positional relationships, are based on the perspective and layout shown in the accompanying drawings. They are intended to facilitate explanation and simplify the description process, and are not absolute limitations on the actual location, construction method, or operating mode of the described device or element. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0032] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0033] like Figure 1 - Figure 4As shown, a rotary jet pump with variable speed includes a housing 18, an outlet section 1, an inlet section 2, a collecting pipe 3, a pump cover 5, an impeller 6, a hub 7, and a bearing housing 9. One end of the housing 18 is detachably connected to the pump cover 5, and the other end of the housing 18 is connected to the bearing housing 9. The inlet section 2 and the outlet section 1 are sequentially connected to the outer side of the pump cover 5. The impeller 6 and the hub 7 are disposed within the housing 18. The cantilever end of the collecting pipe 3 is located within the rotor cavity formed by the impeller 6 and the hub 7. The outlet of the collecting pipe 3... The pipe end passes through the impeller 6 and connects to the water outlet section 1. It also includes a drive shaft 14, a driven shaft 11, a first transmission gear 13, and a second transmission gear 12. The drive shaft 14 and the driven shaft 11 are both mounted in the bearing housing 9 through bearings. The first transmission gear 13 is mounted on the drive shaft 14. One end of the driven shaft 11 is connected to the hub 7, and the other end of the driven shaft 11 is mounted on the second transmission gear 12. The first transmission gear 13 and the second transmission gear 12 directly or indirectly mesh and transmit power.

[0034] The first transmission gear 13 and the second transmission gear 12 are available in various specifications, configured according to the different speeds required by the rotary jet pump. The direct meshing transmission method between the first transmission gear 13 and the second transmission gear 12 requires relatively little space, but it has certain limitations on the speed. Generally, when the pump speed does not exceed 5000 rpm, the direct meshing transmission method works well. However, if the speed requirement exceeds 5000 rpm, the first transmission gear 13 and the second transmission gear 12 need to adopt an indirect meshing transmission method, that is, more gears are required to ensure transmission stability and efficiency. In short, different gear specifications can be selected according to the pump's speed requirements, but in high-speed scenarios, the number of gears needs to be increased to meet the requirements.

[0035] The variable speed rotary jet pump also includes a sealing dynamic ring 15 and a sealing stationary ring 16. The sealing stationary ring 16 is sleeved on the liquid collection pipe 3, and the sealing dynamic ring 15 is installed on the impeller 6. The leakage point between the impeller 6 and the liquid collection pipe 3 is sealed by the cooperation of the sealing dynamic ring 15 and the sealing stationary ring 16.

[0036] The variable speed rotary jet pump also includes a bushing 4, which is connected to the impeller 6 and is sleeved outside the outlet end of the liquid collecting pipe 3. The bushing 4 and the liquid collecting pipe 3 form a liquid inlet channel, which connects the water inlet section 2 and the rotor cavity.

[0037] The variable speed rotary jet pump also includes a motor, which is mounted outside the bearing housing 9 and connected to the drive shaft 14.

[0038] The variable speed rotary jet pump has a water-cooling cover 17 on the bearing housing 9, and a water-cooling coil is provided inside the bearing housing 9. The water-cooling coil is used to cool the gears and bearings inside the bearing housing 9.

[0039] The assembly method of the variable speed rotary jet pump of this utility model includes the following steps:

[0040] Installation steps of drive shaft 14: Install the first bearing and the first transmission gear 13 onto the drive shaft 14 and use a retaining ring for positioning; install the assembled drive shaft 14 into the bearing housing 9 from the motor side, wherein the bearing housing 9 is provided with a first positioning platform for positioning the first bearing; after the first bearing is installed in place, install the drive-side bearing cover 10 to complete the fixing of the drive shaft 14.

[0041] Installation steps for driven shaft 11: First, put the non-drive side bearing cover 8 onto the driven shaft 11; then, pass the driven shaft 11 through the second bearing and the second transmission gear 12 in sequence and install the nut, and then use the retaining ring to fix the second transmission gear 12; install the integrated driven shaft 11 into the bearing housing 9 from the non-drive end of the bearing housing 9, and use the second positioning platform on the bearing housing 9 to position the second bearing; after the second bearing is installed in place, fix the non-drive side bearing cover 8;

[0042] Installation steps for remaining parts: Install the rotating hub 7 onto the driven shaft 11; fit the sealing stationary ring 16 onto the liquid collecting pipe 3 and place the liquid collecting pipe 3 inside the rotating hub 7 cavity; use pins to fix the sealing moving ring 15 on the impeller 6, and then connect the impeller 6 and the rotating hub 7 with hex bolts; connect the shaft sleeve 4 to the impeller 6 with hex bolts; install the sealing component on the shaft sleeve 4; connect the water inlet section 2 and the pump cover 5 using studs; fix the liquid collecting pipe 3 to the water inlet section 2 with hex bolts to compress the sealing stationary ring 16 to achieve a sealing effect; finally, connect the water inlet section 2 and the water outlet section 1 using studs to complete the installation of the entire rotary jet pump.

[0043] This invention features a first transmission gear 13 mounted on the drive shaft 14, while the driven shaft 11 is connected to the hub 7 and equipped with a second transmission gear 12. These two sets of gears can mesh directly or indirectly via an intermediate gear. Driven by a motor, the drive shaft 14 allows users to accurately calculate the relationship between the pump speed and the gear ratio based on actual working conditions. By changing the transmission gears, the speed can be increased or decreased to meet diverse working scenarios. Furthermore, this invention integrates the transmission gears directly into the bearing housing 9, which not only simplifies the overall structure and reduces complex connections between components but also eliminates the need to purchase an additional speed increaser. This effectively reduces production and operating costs while ensuring performance.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary jet pump with variable speed, comprising a housing (18), an outlet section (1), an inlet section (2), a collecting pipe (3), a pump cover (5), an impeller (6), a hub (7), and a bearing housing (9), wherein one end of the housing (18) is detachably connected to the pump cover (5), and the other end of the housing (18) is connected to the bearing housing (9); the inlet section (2) and the outlet section (1) are sequentially connected to the outer side of the pump cover (5); the impeller (6) and the hub (7) are disposed within the housing (18); the cantilever end of the collecting pipe (3) is located within the rotor cavity formed by the impeller (6) and the hub (7); and the outlet end of the collecting pipe (3) passes through the impeller (6) and is connected to the outlet section (1), characterized in that, It also includes a drive shaft (14), a driven shaft (11), a first transmission gear (13), and a second transmission gear (12). The drive shaft (14) and the driven shaft (11) are both mounted in the bearing housing (9) by bearings. The first transmission gear (13) is mounted on the drive shaft (14). One end of the driven shaft (11) is connected to the hub (7), and the other end of the driven shaft (11) is mounted on the second transmission gear (12). The first transmission gear (13) and the second transmission gear (12) mesh directly or indirectly.

2. The variable speed rotary jet pump according to claim 1, characterized in that, It also includes a sealing moving ring (15) and a sealing stationary ring (16). The sealing stationary ring (16) is sleeved on the liquid collecting pipe (3), and the sealing moving ring (15) is installed on the impeller (6). The leakage point between the impeller (6) and the liquid collecting pipe (3) is sealed by the cooperation of the sealing moving ring (15) and the sealing stationary ring (16).

3. The variable speed rotary jet pump according to claim 2, characterized in that, It also includes a bushing (4), which is connected to the impeller (6), and the bushing (4) is sleeved outside the outlet end of the liquid collecting pipe (3). The bushing (4) and the liquid collecting pipe (3) form a liquid inlet channel, which connects the water inlet section (2) and the rotor cavity.

4. The variable speed rotary jet pump according to claim 3, characterized in that, It also includes a motor, which is mounted outside the bearing housing (9) and connected to the drive shaft (14).

5. The variable speed rotary jet pump according to claim 4, characterized in that, The bearing housing (9) is provided with a water-cooling cover (17), and the bearing housing (9) is provided with a water-cooling coil, which is used to cool down the gears and bearings in the bearing housing (9).

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