Vertical mixed-flow pump

Abstract

The utility model relates to the technical field of mixed-flow pumps, in particular to a vertical mixed-flow pump. The utility model provides a vertical mixed-flow pump. The vertical mixed-flow pump comprises a water outlet elbow, a pump shaft, a bearing box, a water guide bearing, a sand-proof sleeve, a first cooling water pipe and a second cooling water pipe, a water guide bearing is installed in the water outlet elbow, a stuffing box and a bearing box are sequentially arranged above the water guide bearing, and the pump shaft sequentially penetrates through the bearing box, the stuffing box and the water guide bearing. The pump shaft is sleeved with the sand-proof sleeve, the two ends of the sand-proof sleeve are connected with the stuffing box and the water guide bearing in a sealed mode respectively, and an annular channel is formed between the sand-proof sleeve and the pump shaft. The high-pressure cooling water can effectively wash away silt between the pump shaft and the water guide bearing, the matching precision of the pump shaft and the water guide bearing is guaranteed, and the service life of the pump shaft and the service life of the water guide bearing are prolonged.

Description

Technical Field

[0001] This utility model relates to the field of mixed-flow pump technology, specifically to a vertical mixed-flow pump. Background Technology

[0002] A vertical mixed-flow pump is a type of pump that combines the characteristics of centrifugal and axial-flow pumps. Its working principle utilizes the rotation of an impeller to convert mechanical energy into the kinetic and pressure energy of the fluid, thereby achieving liquid transport. It typically includes a pump body, impeller, pump shaft, pump bearings, stuffing box, bearing housing, and outlet bend. Specifically, the inlet of a vertical mixed-flow pump is usually located at the bottom of the pump, and the outlet is located at the top. During operation, liquid flows into the pump chamber from the inlet under external pressure. After entering the pump chamber, the liquid is captured by the high-speed rotating impeller. As the impeller rotates, the liquid gains kinetic and pressure energy under the action of the blades, resulting in an oblique flow direction. Under the action of the impeller, the kinetic and pressure energy of the liquid increases; the higher the rotational speed of the impeller, the greater the energy gained by the liquid. After flowing out of the impeller, the liquid enters the pump's guide shell or diffuser, where the kinetic energy is further converted into pressure energy. After energy conversion, the liquid is discharged through the pump outlet, transported to the target location under pressure.

[0003] If the liquid being pumped contains a large amount of impurities such as mud and sand, the mud and sand can easily enter the gap between the pump shaft and the guide bearing as the liquid flows. Since mud and sand have high hardness, once they enter the gap between the pump shaft and the guide bearing, they will cause scratches, pits and other damage to the pump shaft and the guide bearing, resulting in a decrease in the fitting accuracy and a shortened service life of the pump shaft and the guide bearing. Utility Model Content

[0004] (I) The problem to be solved by this utility model is that mud and sand can easily enter the gap between the pump shaft and the guide bearing with the flow of liquid, resulting in a decrease in the fitting accuracy and a shortened service life of the pump shaft and the guide bearing.

[0005] (II) Technical Solution

[0006] A vertical mixed-flow pump includes an outlet elbow, a pump shaft, a bearing housing, a water guide bearing, a sand-proof sleeve, a first cooling water pipe, and a second cooling water pipe.

[0007] A water guide bearing is installed inside the water outlet bend. A stuffing box and a bearing housing are arranged in sequence above the water guide bearing. The pump shaft passes through the bearing housing, the stuffing box and the water guide bearing in sequence.

[0008] The sand-proof sleeve is fitted over the outside of the pump shaft, and both ends of the sand-proof sleeve are respectively sealed to the stuffing box and the water guide bearing. An annular channel is formed between the sand-proof sleeve and the pump shaft, and the gap between the pump shaft and the water guide bearing is connected to the annular channel.

[0009] One end of the first cooling water pipe is connected to the internal annular cavity of the bearing housing, and is used to inject high-pressure cooling water into the bearing housing;

[0010] One end of the second cooling water pipe is connected to the sand-proof sleeve and is used to inject high-pressure cooling water into the annular channel.

[0011] According to one embodiment of the present invention, the first end of the second cooling water pipe is connected to the inner annular cavity of the bearing housing, and the second end is connected to the sandproof sleeve.

[0012] According to one embodiment of the present invention, a third cooling water pipe is included, one end of which is connected to the inner annular cavity of the bearing housing, and the first end of the second cooling water pipe is connected to the first cooling water pipe.

[0013] According to one embodiment of the present invention, at least one pressure gauge for monitoring the cooling water pressure is installed on the first cooling water pipe.

[0014] According to one embodiment of the present invention, at least one flow indicator is installed on the first cooling water pipe.

[0015] According to one embodiment of the present invention, a sealing shell is installed on the outer wall of the outlet bend, the bearing housing is installed on the top of the sealing shell, a stuffing box mounting seat is installed on the outer wall of the outlet bend, a straight hole is formed in the stuffing box mounting seat for the pump shaft to pass through, the straight hole is connected to the outlet bend, the stuffing box is sealed and installed on the top of the stuffing box mounting seat, and the stuffing box is lower than the bearing housing.

[0016] According to one embodiment of the present invention, a pressurized water pump is provided, wherein the outlet of the pressurized water pump is connected to the end of the first cooling water pipe away from the bearing housing.

[0017] According to one embodiment of the present invention, a water tank is included, and the end of the third cooling water pipe away from the bearing housing is connected to the water tank.

[0018] The beneficial effects of this utility model are:

[0019] This vertical mixed-flow pump has the following effects:

[0020] First, the high-pressure cooling water has high pressure and flow rate, which can effectively flush away the mud and sand between the pump shaft and the water guide bearing, restore the normal clearance between them, improve the pump's operating conditions, ensure the fitting accuracy of the pump shaft and the water guide bearing, and improve the service life of the pump shaft and the water guide bearing.

[0021] Secondly, because the mud and sand between the pump shaft and the water guide bearing can be washed away in time, the plating or coating on the inner wall of the pump shaft and the water guide bearing will not be worn off or damaged by mud and sand, thus ensuring the performance of the pump shaft and the water guide bearing.

[0022] Third: High-pressure cooling water can remove the heat generated by the pump shaft and water guide bearing during operation, playing a certain cooling role, which helps to reduce the temperature of the components and prevent damage caused by overheating.

[0023] Fourth: High-pressure cooling water can form a water film between the pump shaft and the water-guided bearing, which provides temporary lubrication, reduces friction between the two, and slows down the wear rate.

[0024] Fifth, it can prevent silt and sand in the water from entering the stuffing box, thus avoiding the problem of the stuffing box's packing seal being worn by silt and sand, leading to seal failure. Moreover, high-pressure cooling water can reduce the temperature of the stuffing box and cool it down. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a first type of vertical mixed-flow pump provided for an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of a second type of vertical mixed-flow pump provided in an embodiment of this utility model.

[0028] Icons: 1. Outlet elbow; 101. Stuffing gland mounting base; 2. Sealing housing; 3. Pump shaft; 4. Coupling; 5. Bearing housing; 6. Stuffing gland; 7. Water guide bearing; 8. Sandproof sleeve; 9. First cooling water pipe; 10. Pressure gauge; 11. Flow indicator; 12. Second cooling water pipe; 13. Third cooling water pipe. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1 and Figure 2 As shown, one embodiment of this utility model provides a vertical mixed flow pump, including an outlet bend 1, a pump shaft 3, a bearing housing 5, a water guide bearing 7, a sand-proof sleeve 8, a first cooling water pipe 9, and a second cooling water pipe 12;

[0031] A water guide bearing 7 is installed inside the water outlet bend 1. A stuffing box 6 and a bearing housing 5 are arranged in sequence above the water guide bearing 7. The pump shaft 3 passes through the bearing housing 5, the stuffing box 6 and the water guide bearing 7 in sequence.

[0032] The sand-proof sleeve 8 is sleeved on the outside of the pump shaft 3, and both ends of the sand-proof sleeve 8 are sealed to the stuffing box 6 and the water guide bearing 7 respectively. An annular channel is formed between the sand-proof sleeve 8 and the pump shaft 3, and the gap between the pump shaft 3 and the water guide bearing 7 is connected to the annular channel. One end of the first cooling water pipe 9 is connected to the inner annular cavity of the bearing housing 5 and is used to inject high-pressure cooling water into the bearing housing 5. One end of the second cooling water pipe 12 is connected to the sand-proof sleeve 8 and is used to inject high-pressure cooling water into the annular channel.

[0033] The water in the pump is according to Figure 1 The direction indicated by the middle arrow suggests that the silt carried in the water can easily enter the gap between the pump shaft 3 and the water guide bearing 7. In this embodiment, the cooling water in the first cooling water pipe 9 is pumped into the annular cavity of the bearing housing 5 to cool the pump shaft 3 and the bearing inside the bearing housing 5. Then, high-pressure cooling water is injected into the annular channel between the sand-proof sleeve 8 and the pump shaft 3 through the second cooling water pipe 12. Under the action of water pressure, the high-pressure cooling water in the annular channel enters the gap between the pump shaft 3 and the water guide bearing 7, thereby flushing the silt between the pump shaft 3 and the water guide bearing 7 downwards, thus removing the silt from the gap between the pump shaft 3 and the water guide bearing 7 and improving the service life of the pump shaft 3 and the water guide bearing 7.

[0034] In addition, since the inflow velocity in the annular channel is greater than the outflow velocity, the water level of the cooling water in the annular channel will gradually rise over time, and eventually the cooling water will enter the stuffing box 6, thereby cooling the stuffing box 6 and the pump shaft 3.

[0035] It should be noted that previously, sediment in the water entered the gap between the pump shaft 3 and the water guide bearing 7 from below the water guide bearing 7; that is, the water flowed according to... Figure 1 The flow is in the direction indicated by the middle arrow, which will cause the following problems:

[0036] First, it exacerbates component wear: due to the high hardness of mud and sand, after entering the gap, it will cause abrasive wear on the inner wall of pump shaft 3 and water guide bearing 7, which can easily lead to scratches, pits and other damage, resulting in a decrease in the fitting accuracy of pump shaft 3 and water guide bearing 7 and a shortened service life of pump shaft 3 and water guide bearing 7.

[0037] Second, it damages the surface treatment layer: The inner walls of the pump shaft 3 and the water guide bearing 7 are usually treated with special processes, such as plating or coating, to improve wear resistance and corrosion resistance. However, the entry of mud and sand into the gap between the pump shaft 3 and the water guide bearing 7 will accelerate the peeling or damage of these surface treatment layers, further reducing the performance of the components.

[0038] Third, it affects the lubrication effect: When mud and sand mix into the lubricating oil or grease between the pump shaft 3 and the water guide bearing 7, it will damage the performance of the lubricant, reduce its lubrication effect, and prevent the effective formation of a good lubricating film between the pump shaft 3 and the water guide bearing 7, resulting in increased friction and aggravated wear.

[0039] This embodiment can produce the following effects:

[0040] First, the high-pressure cooling water has high pressure and flow rate, which can effectively flush away the mud and sand between the pump shaft 3 and the water guide bearing 7, restore the normal gap between them, improve the pump's operating conditions, ensure the fitting accuracy of the pump shaft 3 and the water guide bearing 7, and improve the service life of the pump shaft 3 and the water guide bearing 7.

[0041] Secondly, since the mud and sand between the pump shaft 3 and the water guide bearing 7 can be washed away in time, the plating or coating on the inner wall of the pump shaft 3 and the water guide bearing 7 will not be worn off or damaged by mud and sand, thus ensuring the performance of the pump shaft 3 and the water guide bearing 7.

[0042] Third: High-pressure cooling water can remove the heat generated by the pump shaft 3 and water guide bearing 7 during operation, playing a certain cooling role, which helps to reduce the temperature of the components and prevent damage caused by overheating.

[0043] Fourth: High-pressure cooling water can form a water film between the pump shaft 3 and the water guide bearing 7, which can play a temporary lubricating role, reduce friction between the two, and reduce the wear rate.

[0044] Fifth, it can prevent mud and sand in the water from entering between the stuffing box 6 and the pump shaft 3, thus avoiding the problem of the stuffing seal of the stuffing box 6 being worn by mud and sand, leading to seal failure. Moreover, the high-pressure cooling water can reduce the temperature of the stuffing box 6 and cool it down.

[0045] It should be noted that in the past, when the silt in the water flowed out of the outlet bend 1, some of the silt inevitably entered the gap between the stuffing box 6 and the pump shaft 3, which led to a reduction in the service life of the components.

[0046] In this embodiment, the high-pressure cooling water between the pump shaft 3 and the sand-proof sleeve 8 continuously flushes away the mud and sand between the water guide bearing 7 and the pump shaft 3, effectively preventing mud and sand from entering the annular channel between the water guide bearing 7 and the pump shaft 3. Consequently, it also prevents mud and sand from entering the gap between the stuffing box 6 and the pump shaft 3, thus protecting the stuffing box 6 and the pump shaft 3. Even if a small amount of mud and sand enters the annular channel between the water guide bearing 7 and the pump shaft 3, the water pressure of the cooling water within the annular channel makes it difficult for the mud and sand to move upwards into the gap between the stuffing box 6 and the pump shaft 3.

[0047] In this embodiment, as Figure 1 As shown, a sealing shell 2 is installed on the outer wall of the outlet elbow 1, and the bearing housing 5 is installed on the top of the sealing shell 2. A through hole is opened on the outer wall of the outlet elbow 1, and a stuffing box mounting seat 101 is sealed and installed at the through hole. A straight hole for the pump shaft 3 to pass through is formed in the stuffing box mounting seat 101. The straight hole is connected to the through hole on the outlet elbow 1. The stuffing box 6 is sealed and installed on the top of the stuffing box mounting seat 101. The stuffing box 6 is located directly below the bearing housing 5. The stuffing box 6, the bearing housing 5 and the water guide bearing 7 are coaxially arranged.

[0048] As a specific embodiment, such as Figure 2 As shown, the first cooling water injection mechanism includes a first cooling water pipe 9 and a third cooling water pipe 13. The bearing housing 5 has an inlet and an outlet. One end of the first cooling water pipe 9 is connected to the inlet on the bearing housing 5, and one end of the third cooling water pipe 13 is connected to the outlet on the bearing housing 5. This vertical mixed-flow pump also includes a water tank and a booster pump. The outlet of the booster pump is connected to one end of the first cooling water pipe 9. Specifically, depending on the actual situation, a suitable water source, such as tap water or a circulating water system, is selected as the source of cooling water. The booster pump pumps the cooling water from the water source into the bearing housing 5 through the first cooling water pipe 9. Subsequently, the cooling water in the bearing housing 5 flows into the third cooling water pipe 13 under water pressure, and finally flows into the water tank.

[0049] Furthermore, one end of the second cooling water pipe 12 is connected to the water outlet on the side wall of the first cooling water pipe 9, and the other end is connected to the hole on the side wall of the sandproof sleeve 8.

[0050] Thus, the high-pressure water pump pumps high-pressure cooling water into the first cooling water pipe 9. A portion of the water in the first cooling water pipe 9 flows into the bearing housing 5 and then into the water tank through the third cooling water pipe 13. A portion of the water in the first cooling water pipe 9 flows into the annular channel between the pump shaft 3 and the sand-proof sleeve 8 through the second cooling water pipe 12 to flush away the mud and sand between the pump shaft 3 and the water guide bearing 7.

[0051] In some embodiments, a valve body for controlling the flow of water is installed on the side of the second cooling water pipe 12 near the first cooling water pipe 9.

[0052] It should be explained that since the cooling water in the first cooling water pipe 9 is divided into two parts, one part enters the bearing housing 5 and the other part enters the second cooling water pipe 12, the water pressure entering the annular channel may be low, thus the effect of flushing mud and sand between the pump shaft 3 and the water guide bearing 7 is not great.

[0053] As another specific embodiment, such as Figure 1 As shown, the first cooling water injection mechanism includes a first cooling water pipe 9, and the bearing housing 5 is provided with an inlet and an outlet. One end of the first cooling water pipe 9 is connected to the inlet on the bearing housing 5, and one end of the second cooling water pipe 12 is connected to the outlet on the bearing housing 5, and the other end is connected to a hole on the side wall of the sandproof sleeve 8.

[0054] Thus, the high-pressure water pump pumps high-pressure cooling water into the first cooling water pipe 9. All the cooling water in the first cooling water pipe 9 flows into the bearing housing 5. Then, under the action of water pressure, the cooling water in the bearing housing 5 flows into the second cooling water pipe 12, and finally flows into the annular channel between the pump shaft 3 and the water guide bearing 7. In this embodiment, since all the cooling water in the first cooling water pipe 9 enters the bearing housing 5 and then flows from the bearing housing 5 into the second cooling water pipe 12, the volume and pressure of the cooling water entering the annular channel are large, which can better flush away the mud and sand between the pump shaft 3 and the water guide bearing 7.

[0055] In some embodiments, a pressure gauge 10 and a flow indicator 11 are sequentially installed on the first cooling water pipe 9. The pressure gauge 10 is used to detect the water pressure inside the first cooling water pipe 9. When a normal flow of liquid passes through the first cooling water pipe 9, the flow indicator 11 will emit a corresponding normal signal, indicating that the system flow rate is within the normal operating range and the equipment is operating well. The flow indicator 11 can be interlocked with the control system. When the flow rate is abnormal, it will automatically trigger the corresponding protection action to further ensure the safe and reliable operation of the system.

[0056] In some embodiments, a mounting groove is provided on the top surface of the water guide bearing 7, and the bottom end of the sand-proof sleeve 8 is sealed and installed in the mounting groove by a seal. Preferably, the seal is an O-ring.

[0057] In some embodiments, the top opening of the sandproof sleeve 8 is located in the straight hole of the stuffing box mounting base 101, the top side wall of the sandproof sleeve 8 is provided with a stepped groove, a sealing ring is fitted on the stepped groove, and the top of the sandproof sleeve 8 is connected to the bottom space of the stuffing box 6 through the sealing ring.

[0058] It should be noted that the vertical mixed flow pump includes a drive motor and an impeller. The output end of the drive motor is connected to the pump shaft 3 through a coupling 4, and the impeller is connected to the pump shaft 3 through a sleeve coupling assembly.

[0059] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0061] 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 vertical mixed-flow pump, characterized in that, It includes a water outlet bend (1), a pump shaft (3), a bearing housing (5), a water guide bearing (7), a sand-proof sleeve (8), a first cooling water pipe (9), and a second cooling water pipe (12); The water outlet bend (1) is equipped with a water guide bearing (7), and a stuffing box (6) and a bearing housing (5) are arranged in sequence above the water guide bearing (7). The pump shaft (3) passes through the bearing housing (5), the stuffing box (6) and the water guide bearing (7) in sequence. The sand-proof sleeve (8) is sleeved on the outside of the pump shaft (3), and the two ends of the sand-proof sleeve (8) are respectively sealed to the stuffing box (6) and the water guide bearing (7). An annular channel is formed between the sand-proof sleeve (8) and the pump shaft (3), and the gap between the pump shaft (3) and the water guide bearing (7) is connected to the annular channel. One end of the first cooling water pipe (9) is connected to the internal annular cavity of the bearing housing (5) for injecting high-pressure cooling water into the bearing housing (5); One end of the second cooling water pipe (12) is connected to the sand-proof sleeve (8) and is used to inject high-pressure cooling water into the annular channel.

2. A vertical mixed-flow pump according to claim 1, characterized in that, The first end of the second cooling water pipe (12) is connected to the inner annular cavity of the bearing housing (5), and its second end is connected to the sandproof sleeve (8).

3. A vertical mixed-flow pump according to claim 1, characterized in that, It includes a third cooling water pipe (13), one end of which is connected to the inner annular cavity of the bearing housing (5), and the first end of the second cooling water pipe (12) is connected to the first cooling water pipe (9).

4. A vertical mixed-flow pump according to claim 1, characterized in that, At least one pressure gauge (10) for monitoring the cooling water pressure is installed on the first cooling water pipe (9).

5. A vertical mixed-flow pump according to claim 1, characterized in that, At least one flow indicator (11) is installed on the first cooling water pipe (9).

6. A vertical mixed-flow pump according to claim 1, characterized in that, A sealing shell (2) is installed on the outer wall of the outlet bend (1), and the bearing housing (5) is installed on the top of the sealing shell (2). A stuffing box mounting seat (101) is installed on the outer wall of the outlet bend (1). A straight hole for the pump shaft (3) to pass through is formed in the stuffing box mounting seat (101). The straight hole is connected to the outlet bend (1). The stuffing box (6) is sealed and installed on the top of the stuffing box mounting seat (101), and the stuffing box (6) is lower than the bearing housing (5).

7. A vertical mixed-flow pump according to claim 2 or 3, characterized in that, It includes a pressurized water pump, the outlet of which is connected to the end of the first cooling water pipe (9) away from the bearing housing (5).

8. A vertical mixed-flow pump according to claim 3, characterized in that, Includes a water tank, and the end of the third cooling water pipe (13) away from the bearing housing (5) is connected to the water tank.

Images