A self-balancing single-stage double-suction split-case pump

Abstract

The present invention relates to the technical field of split-case pumps, and discloses a self-balancing single-stage double-suction split-case pump, which includes a split-case pump and a motor. The motor is connected to the pump shaft in the split-case pump, an impeller for connecting the pump shaft, and an oil injection unit provided on the split-case pump for injecting lubricating oil into the area where the pump shaft is located. The oil injection unit includes a locking assembly, an oil injection assembly, and a fixed seat. When lubricating oil injection work needs to be carried out, gas can be input into another air inlet nozzle, so that the second sealing seat displaces towards the direction of the first knob, so that a gap appears between the driven rod and the second sealing block. Then, the lubricating oil can move from the second connecting seat to the fixed seat and the self-locking assembly, and flow out from the screwed part, and finally be injected into the area where the bearing and the pump shaft are located, playing a lubricating effect on the bearing and the pump shaft, avoiding dry grinding when the pump shaft rotates, and ensuring the smooth operation of the split-case pump.

Description

Technical Field

[0001] The present invention relates to the technical field of split-case pumps, and specifically to a self-balanced single-stage double-suction split-case pump. Background Art

[0002] A split-case pump, also known as a single-stage double-suction centrifugal pump, has an impeller inside the pump casing during operation and is directly driven by an electric motor. Liquid enters the pump through a foot valve and a suction pipe, and is thrown out under the action of the centrifugal force of the high-speed rotating impeller. A low-pressure area is formed in the center of the impeller, causing the liquid to continuously flow in and then be thrown out. Its suction port and discharge port are below the axis of the water pump, and are perpendicular to the axis in the horizontal direction.

[0003] For example, a Chinese patent with the authorization announcement number CN117685229B discloses a liquid-collecting and heating split-case pump, which includes a pump body. The liquid inlet end of the pump body is communicated with a liquid inlet pipe, the liquid discharge end of the pump body is communicated with a liquid outlet pipe, and a support is fixedly connected to the outer wall of the pump body. It further includes: a collecting structure arranged on the surface of the support for collecting the residual liquid in the pump body. The collecting structure includes a liquid collecting box fixedly installed on the surface of the support, a partition for separating the internal space of the liquid collecting box, a first connecting pipe and a second connecting pipe for guiding the liquid, and a first plugging plate and a second plugging plate for respectively plugging the first connecting pipe and the second connecting pipe.

[0004] However, there are still some problems in the above patent. When using the above split-case pump, during long-term use, when transporting high-temperature liquid, or when the split-case pump is applied in a high-temperature environment, the lubricating oil between the bearing and the pump shaft is likely to volatilize, resulting in the loss of lubrication effect between the two. The lack of lubricating oil between the pump shaft and the bearing causes the phenomenon of dry running due to lack of oil. In severe cases, it may even lead to the defect of bearing seizure.

[0005] Therefore, how to ensure continuous lubrication between the bearing and the pump shaft, reduce the dry running phenomenon, and extend the normal service life of the bearing is a problem to be solved currently. Summary of the Invention

[0006] The present invention provides a self-balanced single-stage double-suction split-case pump to solve the above problems existing in the prior art.

[0007] A self-balanced single-stage double-suction split-case pump includes:

[0008] A split-case pump and an electric motor. The electric motor is connected to the pump shaft in the split-case pump, an impeller for connecting the pump shaft, and an oil injection unit arranged on the split-case pump for injecting lubricating oil into the area where the pump shaft is located;

[0009] The oil injection unit includes a locking assembly, an oil injection assembly, and a fixed seat;

[0010] A locking assembly, connected to the oil injection assembly, is used to open the oil injection assembly so that lubricating oil is transported from the oil injection assembly into the fixed seat;

[0011] An oil injection assembly, connected to the fixed seat to form an integral structure, is used to form a flow channel for lubricating oil;

[0012] A fixed seat, in which a through hole for the flow of lubricating oil is provided; The impeller has double suction on both sides, so that it has the characteristic of automatically balancing the axial force.

[0013] Further, the locking assembly includes a first connecting seat, a driving rod and a driven rod arranged in the first connecting seat, a transmission seat for connecting the driving rod and the driven rod, a limiting ring arranged on the driving rod, a limiting spring sleeved on the driving rod, and a first knob arranged at one end of the driving rod;

[0014] The transmission seat divides the space in the first connecting seat into two cavities, and the cavities are respectively communicated with air inlet nozzles;

[0015] One side of the transmission seat abuts against the limiting spring;

[0016] By rotating the first knob to adjust the position of the driven rod, and then adjusting the position of the driven rod through the provided air inlet nozzles, the lubricating oil can be injected into the preset position.

[0017] Further, the transmission seat includes a first sealing seat and a second sealing seat;

[0018] The first sealing seat is sleeved on the driving rod and is movably connected to the driving rod, and the limiting spring is connected to the first sealing seat;

[0019] The second sealing seat is sleeved on the driven rod;

[0020] A protrusion is provided on one side of the second sealing seat facing the first sealing seat, and a groove adapted to the protrusion is provided on the first sealing seat;

[0021] A chute is provided on the driven rod, and the other end of the driving rod is located in the chute of the driven rod;

[0022] By injecting air into the air inlet nozzles, the position of the transmission seat in the first connecting seat is adjusted, so that the lubricating oil can be injected.

[0023] Further, the oil injection assembly includes a second connecting seat connected to the first connecting seat, an oil injection nozzle provided on the second connecting seat, a first conical cavity and a second conical cavity opened on the second connecting seat, and a second sealing block provided at the head position of the second conical cavity;

[0024] The oil outlet of the oil filling nozzle is communicated with the second conical cavity;

[0025] The free end of the driven rod is in a frustum shape. The driven rod sequentially penetrates through the first conical cavity and the second conical cavity and abuts against the second sealing block;

[0026] The head of the first conical cavity is connected to the bottom of the second conical cavity.

[0027] Furthermore, the oil filling assembly includes a first sealing block sleeved on the driven rod, and a second knob that abuts against the first sealing block and is screwed to the second connecting seat;

[0028] The first sealing block extends into the first conical cavity from the bottom of the first conical cavity, and the deformation amount of the first sealing block is adjusted by rotating the second knob;

[0029] The second connecting seat is provided with a U-shaped groove, and the second knob is located in the U-shaped groove.

[0030] Furthermore, the oil filling unit further includes a self-locking assembly connected to the fixed seat, and a screw member connected to the self-locking assembly;

[0031] The self-locking assembly includes a third connecting seat screwed to the fixed seat. An adjustment cavity is provided in the third connecting seat. A regulating valve core is located in the adjustment cavity, and two third sealing blocks are arranged at both ends of the regulating valve core.

[0032] Furthermore, the regulating valve core includes an oil outlet rod, a return spring sleeved on the oil outlet rod, and a connecting plate connected to the return spring and arranged on the oil outlet rod;

[0033] The adjustment cavity includes three circular through holes with different diameters and sequentially forms a first shoulder and a second shoulder in the direction away from the fixed seat. One end of the return spring abuts against the second shoulder, and the first shoulder is used to limit the moving distance of the connecting plate;

[0034] The connecting plate is in a cross shape.

[0035] Furthermore, a filtering unit is also provided at the water inlet end of the split case pump, and a filter valve connected to the filtering unit;

[0036] The filter valve includes a T-shaped valve seat, a first guide plate arranged at the water inlet end of the valve seat, a second guide plate located at the water outlet end of the valve seat, and a plug screwed to the bottom of the T-shaped valve seat and the valve seat;

[0037] Wherein, one end of the first guide plate close to the plug is provided with an inclined surface, and the second guide plate is in an arc shape.

[0038] Further, the filtering unit includes a housing for connecting the valve seat and the split-case pump, a plurality of reinforcing ribs uniformly arranged on the inner wall of the housing, an inner cylinder connected to the reinforcing ribs, a driving part disposed in the inner cylinder, a moving seat connected to the driving part, and a filter screen connected to the moving seat;

[0039] The inner cylinder is of a U-shaped structure, and its bottom is located at the water inlet end of the housing.

[0040] Further, the driving part includes an adjusting handwheel, an adjusting rod connected to the adjusting handwheel, a transmission member sleeved on the adjusting rod, and a movable rod movably connected to the transmission member;

[0041] One end of the movable rod is connected to the moving seat;

[0042] A slide rail is further provided on the outer wall of the moving seat, and a movable groove located on the inner wall of the inner cylinder and slidably connected to the slide rail;

[0043] One end of the adjusting rod extends into the inner cylinder and is connected to the inner wall of the inner cylinder.

[0044] Beneficial effects: The present invention discloses a self-balancing single-stage double-suction split-case pump. In order to ensure continuous lubrication between the bearing and the pump shaft and reduce dry grinding phenomenon, a locking assembly is provided in this device. The locking assembly in this device includes a first connection seat, a driving rod and a driven rod disposed in the first connection seat, a transmission seat for connecting the driving rod and the driven rod, a limiting ring disposed on the driving rod, a limiting spring sleeved on the driving rod, and a first knob disposed at one end of the driving rod; the transmission seat divides the space in the first connection seat into two cavities, and the cavities are respectively communicated with an air inlet nozzle; through the provided locking assembly, it can be used as a switch of the oil injection unit to control the flow of lubricating oil so that it can be transported to a preset position. When the locking assembly starts to work, by rotating the first knob, the position of the driven rod is adjusted, and the distance between the driven rod and the second sealing block on the second connection seat is adjusted. Then, by inflating one of the air inlet nozzles, the first sealing seat moves towards the second connection seat, so that the driven rod abuts against the second sealing block, thereby improving the sealing performance between the driven rod and the second sealing block. When lubricating oil injection work is required, air can be input into the other air inlet nozzle, so that the second sealing seat displaces towards the first knob, so that a gap appears between the driven rod and the second sealing block. Then, the lubricating oil can move from the second connection seat to the fixing seat and the self-locking assembly and flow out from the threaded part, and finally be injected into the area where the bearing and the pump shaft are located, playing a lubricating effect on the bearing and the pump shaft, avoiding dry grinding when the pump shaft rotates, and ensuring the smooth operation of the split-case pump. Description of the Drawings

[0045] Figure 1It is a schematic structural diagram of a self-balancing single-stage double-suction split pump according to the present invention;

[0046] Figure 2 It is a schematic structural diagram of the oil injection unit of the present invention;

[0047] Figure 3 It is a schematic structural diagram of the locking assembly of the present invention;

[0048] Figure 4 It is a schematic structural diagram of the oil injection assembly of the present invention;

[0049] Figure 5 It is a schematic structural diagram of the second sealing block of the present invention;

[0050] Figure 6 It is a schematic structural diagram of the self-locking assembly of the present invention;

[0051] Figure 7 It is a schematic structural diagram of the regulating valve core of the present invention;

[0052] Figure 8 It is a schematic structural diagram of the filtering unit of the present invention

[0053] Figure 9 It is a schematic structural diagram of the filter valve of the present invention;

[0054] Figure 10 It is a schematic structural diagram of the second guide plate of the present invention.

[0055] Reference numerals: 1, split pump; 2, oil injection unit; 21, locking assembly; 211, first connecting seat; 212, driving rod; 213, first knob; 214, limiting ring; 215, limiting spring; 216, first sealing seat; 217, second sealing seat; 218, driven rod; 219, air inlet nozzle; 22, oil injection assembly; 221, second connecting seat; 222, first sealing block; 223, second knob; 224, second sealing block; 225, first conical cavity; 226, second conical cavity; 227, oil injection nozzle; 23, self-locking assembly; 231, third connecting seat; 232, third sealing block; 233, oil outlet rod; 234, return spring; 235, connecting plate; 24, screw member; 25, fixed seat; 3, filtering unit; 31, housing; 32, inner cylinder; 33, adjusting handwheel; 34, adjusting rod; 35, transmission member; 36, movable rod; 37, slide rail; 38, moving seat; 39, filter screen; 4, filter valve; 41, valve seat; 42, first guide plate; 43, second guide plate; 44, plug; 5, motor. Detailed implementation manners

[0056] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0057] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways than those specifically described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0058] Secondly, the so-called "one embodiment" or "embodiment" refers to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an individual or selectively mutually exclusive embodiment with other embodiments.

[0059] The present invention discloses a self-balancing single-stage double-suction split-case pump. Referring to Figures 1 - 10 , it includes:

[0060] A split-case pump 1 and a motor 5. The motor 5 is connected to the pump shaft in the split-case pump 1, an impeller for connecting the pump shaft, and an oil injection unit 2 provided on the split-case pump 1 for injecting lubricating oil into the area where the pump shaft is located. The oil injection unit 2 includes a locking assembly 21, an oil injection assembly 22, and a fixing seat 25. The locking assembly 21 is connected to the oil injection assembly 22 and is used to open the oil injection assembly 22 so that the lubricating oil is transported from the oil injection assembly 22 to the inside of the fixing seat 25. The oil injection assembly 22 is connected to the fixing seat 25 to form an integral structure and is used to form a flow channel for the lubricating oil. The fixing seat 25 is provided with a through hole for the flow of the lubricating oil. By means of the locking assembly 21 in the provided oil injection unit 2, the locking assembly 21 is equivalent to the switch of the oil injection unit 2. Through the movement of the locking assembly 21, the input and output of the lubricating oil are adjusted, so that the lubricating oil can be transported along the established channel to between the pump shaft and the bearing, thereby enabling the lubrication of the pump shaft and the bearing and avoiding dry grinding between the pump shaft and the bearing.

[0061] The locking assembly 21 includes a first connecting seat 211, a driving rod 212 and a driven rod 218 disposed in the first connecting seat 211, a transmission seat for connecting the driving rod 212 and the driven rod 218, a limiting ring 214 disposed on the driving rod 212, a limiting spring 215 sleeved on the driving rod 212, and a first knob 213 disposed at one end of the driving rod 212; the transmission seat divides the space in the first connecting seat 211 into two cavities, and the cavities are respectively communicated with an air inlet nozzle 219; one side of the transmission seat abuts against the limiting spring 215; by rotating the first knob 213 to adjust the position of the driven rod 218, and then adjusting the position of the driven rod 218 through the provided air inlet nozzle 219, so that the lubricating oil can be injected to a predetermined position; the transmission seat includes a first sealing seat 216 and a second sealing seat 217; the first sealing seat 216 is sleeved on the driving rod 212 and is movably connected to the driving rod 212, and the limiting spring 215 is connected to the first sealing seat 216; the second sealing seat 217 is sleeved on the driven rod 218; a protrusion is provided on one side of the second sealing seat 217 facing the first sealing seat 216, and a groove adapted to the protrusion is provided on the first sealing seat 216; a sliding groove is provided on the driven rod 218, and the other end of the driving rod 212 is located in the sliding groove of the driven rod 218; by injecting gas into the air inlet nozzle 219, the position of the transmission seat in the first connecting seat 211 is adjusted, so that the lubricating oil can perform the injection work;

[0062] When it is necessary to control the injection amount of the lubricating oil, it is divided into the following three stages:

[0063] The working mode of the first stage is: first, rotate the first knob 213, and then the moving first knob 213 can drive the driving rod 212 to move. The moving driving rod 212 can change the position of the limiting ring 214, so that the limiting ring 214 pushes the transmission seat to move, adjusts the movement of the transmission seat in the first connecting seat 211, and thus adjusts the position of the free end of the driven rod 218 to complete the first-stage work of blocking the transportation of the lubricating oil;

[0064] The working mode of the second stage is: then, perform the air injection work into one of the air inlet nozzles 219, so that the first sealing seat 216 moves in the direction of the second connecting seat 221. Since the first sealing seat 216 is slidably connected to the driving rod 212 and the driving rod 212 is located in the sliding groove of the driven rod 218, when the air injection work is performed, the first sealing seat 216 can move on the driving rod 212, so as to be able to push the second sealing seat 217 to move, and can adjust the pressure of the driven rod 218 on the second sealing block 224 to realize the secondary blocking work of the lubricating oil;

[0065] The working mode of the third stage is as follows: when the transportation of lubricating oil is required, gas is input into another air inlet 219 at this time, and in cooperation with the stretched limiting spring 215, the second sealing seat 217 is displaced towards the direction of the first knob 213, so that a gap appears between the driven rod 218 and the second sealing block 224. Then, the lubricating oil can move from the second connecting seat 221 to the fixed seat 25 and the self-locking assembly 23, and flow out from the screw connector 24, and finally be injected into the area where the bearing and the pump shaft are located, playing a lubricating role for the bearing and the pump shaft, avoiding dry grinding when the pump shaft rotates, and ensuring the smooth operation of the split case pump 1;

[0066] During the first stage, by rotating the first knob 213, not only can the deformation amount of the second sealing block 224 be adjusted to complete the blocking work of the lubricating oil, but also during the rotation of the first knob 213, the position of the limiting ring 214 on the driving rod 212 can be changed. Thus, during the transportation of the lubricating oil, the first sealing seat 216 will abut against the limiting ring 214, and then the maximum distance between the driven rod 218 and the second sealing block 224 can be controlled, so as to control the oil output and avoid excessive oil output and waste;

[0067] First, rotate the first knob 213, and then inject gas into one of the air inlets 219. Then, the pressure between the driven rod 218 and the second sealing block 224 can be adjusted in real time, so as to ensure the smooth progress of the lubricating oil transportation work. Without changing the maximum displacement of the transmission seat, by changing the amount of gas filled, the deformation amount of the limiting spring 215 is changed, so as to change the pressure between the driven rod 218 and the second sealing block 224, and then ensure the smooth progress of the lubricating oil transportation work, realizing the dynamic adjustment of the pressure between the driven rod 218 and the second sealing block 224;

[0068] When the third stage of work is carried out, during the previous two stages, the limiting spring 215 is in a stretched state. Thus, when injecting gas into another air inlet 219, in cooperation with the stretched limiting spring 215, the driven rod 218 can quickly move away from the second sealing block 224, improving the injection speed of the lubricating oil.

[0069] The oil injection assembly 22 includes a second connection seat 221 connected to the first connection seat 211, an oil injection nozzle 227 provided on the second connection seat 221, a first tapered cavity 225 and a second tapered cavity 226 formed in the second connection seat 221, and a second sealing block 224 provided at the head position of the second tapered cavity 226; wherein the oil outlet of the oil injection nozzle 227 communicates with the second tapered cavity 226; the free end of the driven rod 218 is in a frustum shape, and the driven rod 218 sequentially passes through the first tapered cavity 225 and the second tapered cavity 226 and abuts against the second sealing block 224; the head of the first tapered cavity 225 is connected to the bottom of the second tapered cavity 226; when a gap appears between the driven rod 218 and the second sealing block 224, the oil injection device can be used to inject oil into the first tapered cavity 225 and the second tapered cavity 226 through the oil injection nozzle 227, and the lubricating oil is discharged from the head of the second tapered cavity 226 through the through hole on the fixed seat 25.

[0070] The oil injection assembly 22 further includes a first sealing block 222 sleeved on the driven rod 218, and a second knob 223 that abuts against the first sealing block 222 and is screwed to the second connection seat 221; the first sealing block 222 extends into the first tapered cavity 225 from the bottom of the first tapered cavity 225, and the deformation amount of the first sealing block 222 is adjusted by rotating the second knob 223; a U-shaped groove is provided on the second connection seat 221, and the second knob 223 is located in the U-shaped groove; by rotating the second knob 223, the insertion amount of the second knob 223 into the second connection seat 221 is adjusted, so as to change the deformation amount of the first sealing block 222 and improve the sealing effect of the first sealing block 222.

[0071] The oil injection unit 2 further includes a self-locking assembly 23 connected to the fixed seat 25, and a screw member 24 connected to the self-locking assembly 23; the self-locking assembly 23 includes a third connection seat 231 screwed to the fixed seat 25, an adjustment cavity provided in the third connection seat 231, a regulating valve core located in the adjustment cavity, and two third sealing blocks 232 provided at both ends of the regulating valve core; the regulating valve core includes an oil outlet rod 233, a return spring 234 sleeved on the oil outlet rod 233, and a connecting plate 235 connected to the return spring 234 and provided on the oil outlet rod 233; the adjustment cavity includes three circular through holes with different diameters and sequentially forms a first shoulder and a second shoulder in the direction away from the fixed seat 25, one end of the return spring 234 abuts against the second shoulder, and the first shoulder is used to limit the moving distance of the connecting plate 235; the connecting plate 235 is in a cross shape;

[0072] When the third connecting seat 231 is connected to the fixed seat 25, the return spring 234 is in a compressed state. When the oil pressure of the lubricating oil in the oil injection assembly 22 is greater than the elastic force generated by the return spring 234, the lubricating oil can push the oil outlet rod 233 to move in the third connecting seat 231, so that it can be discharged from the outlet of the screw joint 24, so that the lubricating oil can be injected to the predetermined position. During this process, through the arranged return spring 234 and the third sealing block 232, the lubricating oil can be blocked again. Only when the oil pressure is higher than the elastic force of the return spring 234 can the transportation work of the lubricating oil be carried out. Since the third sealing block 232 is a conical mechanism, when the lubricating oil with a certain pressure passes through the third connecting seat 231, it will collide with the third sealing block 232 at the outlet of the third connecting seat 231, forming a plurality of small oil droplets, which can then be sprayed on the pump shaft to improve the lubrication effect.

[0073] A filtering unit 3 is further provided at the water inlet end of the split case pump 1, and a filtering valve 4 connected to the filtering unit 3; the filtering valve 4 includes a T-shaped valve seat 41, a first guide plate 42 arranged at the water inlet end of the valve seat 41, a second guide plate 43 located at the water outlet end of the valve seat 41, and a plug 44 arranged at the bottom of the T-shaped valve seat 41 and screwed to the valve seat 41; wherein a slope is provided at one end of the first guide plate 42 close to the plug 44, and the second guide plate 43 is an arc-shaped structure; when the split case pump 1 is working, the water flow falls along the slope on the first guide plate 42 to the bottom of the T-shaped valve seat 41, and then as the water flow increases, the water surface in the T-shaped valve seat 41 is higher than the top of the second guide plate 43. At this time, the water flow can be discharged from the water outlet end of the T-shaped valve seat 41, and the bottom of the T-shaped valve seat 41 can be used as a buffer zone, so as to buffer and precipitate the impurities in the water.

[0074] The filter unit 3 includes a shell 31 for connecting the valve seat 41 and the split-center pump 1, a plurality of reinforcing ribs evenly arranged on the inner wall of the shell 31, an inner cylinder 32 connected to the reinforcing ribs, a driving part built into the inner cylinder 32, a movable seat 38 connected to the driving part, and a filter screen 39 connected to the movable seat 38; the inner cylinder 32 is a U-shaped structure, and its bottom is located at the water inlet end of the shell 31; the driving part includes an adjusting hand wheel 33, an adjusting rod 34 connected to the adjusting hand wheel 33, a transmission member 35 sleeved on the adjusting rod 34, and a movable rod 36 movably connected to the transmission member 35; one end of the movable rod 36 is connected to the movable seat 38; the outer wall of the movable seat 38 is also provided with a slide rail 37, and a filter screen 39 slidably connected to the slide rail 37 and located in the inner cylinder 3 2 movable groove on the inner wall; one end of the adjusting rod 34 extends into the inner cylinder 32 and is connected to the inner wall of the inner cylinder 32; when the split pump 1 is working, the adjusting hand wheel 33 is rotated, and the moving adjusting hand wheel 33 can drive the adjusting rod 34 to rotate, thereby driving the transmission member 35 to move, and the moving transmission member 35 can drive the movable rod 36 to move. Since one end of the movable rod 36 is movably connected with the movable seat 38, the position of the movable seat 38 can be adjusted so that it can be retracted into the inner cylinder 32, so that the filter screen 39 is directly opposite to the channel for water flow formed by the inner wall of the shell 31 and the outer wall of the inner cylinder 32, and then the impurities in the water can be filtered to prevent them from entering the split pump 1. The filter screen 39 is a cover-shaped structure. At the same time, by changing the position of the movable seat 38, the water volume can be controlled to ensure the smooth progress of the fluid transportation work.

[0075] In a further embodiment, the head of the first conical cavity 225 and the second conical cavity 226 is the end with a smaller diameter, and the other end is the bottom; the second connecting seat 221 is provided with an oil filling port, and when not in oil filling operation, the oil filling port is sealed by the second sealing block 224 and the driven rod 218; the screw connector 24 is connected to the pump housing and is used to inject lubricating oil into the pump shaft;

[0076] One of the third sealing blocks 232 is used to block one end of the regulating cavity, and the other third sealing block 232 is used to block the through hole on the fixing seat 25;

[0077] The gas injection nozzle is connected to a gas injection device, and the oil injection nozzle 227 is connected to an oil injection device. The gas injection device and the oil injection device are prior art.

[0078] Working principle description: When the middle pump 1 is working, the water flows along the inclined surface on the first guide plate 42 and falls to the bottom of the T-shaped valve seat 41. Then, as the water flow increases, the water surface in the T-shaped valve seat 41 is higher than the top of the second guide plate 43. At this time, the water flow can be discharged from the outlet of the T-shaped valve seat 41, and the bottom of the T-shaped valve seat 41 can be used as a buffer zone, thereby buffering and precipitating impurities in the water. When the middle pump 1 is working, the adjusting hand wheel 33 is turned, and the moving adjusting hand wheel 33 can drive the adjusting rod 34 to rotate, thereby driving the transmission member 35. Movement, the moving transmission member 35 can drive the movable rod 36 to move. Since one end of the movable rod 36 is movably connected to the movable seat 38, the position of the movable seat 38 can be adjusted so that it can be retracted into the inner cylinder 32, so that the filter screen 39 is directly opposite to the channel for water flow formed by the inner wall of the outer shell 31 and the outer wall of the inner cylinder 32, thereby filtering impurities in the water to prevent them from entering the split pump 1. The filter screen 39 is a cover-shaped structure. At the same time, by changing the position of the movable seat 38, the water volume can be controlled to ensure the smooth progress of the fluid transportation work;

[0079] When the amount of lubricating oil injection needs to be controlled, it is divided into the following three stages:

[0080] The working method of the first stage is: firstly, the first knob 213 is rotated, and then the moving first knob 213 can drive the driving rod 212 to move, and the moving driving rod 212 can change the position of the limiting ring 214, so that the limiting ring 214 pushes the transmission seat to move, and the transmission seat is adjusted to move in the first connecting seat 211, thereby adjusting the position of the free end of the driven rod 218, and completing the first stage of blocking the transportation of lubricating oil;

[0081] The working method of the second stage is: then, air is pumped into one of the air inlet nozzles 219, so that the first sealing seat 216 moves toward the direction of the second connecting seat 221. Since the first sealing seat 216 is slidably connected with the driving rod 212 and the driving rod 212 is located in the slide groove of the driven rod 218, when the air is inflated, the first sealing seat 216 can move on the driving rod 212, thereby pushing the second sealing seat 217 to move, and adjusting the pressure of the driven rod 218 on the second sealing block 224 to achieve secondary blocking of the lubricating oil.

[0082] The working mode of the third stage is as follows: when the transportation of lubricating oil is required, air is input into another air inlet 219 at this time, and in cooperation with the stretched limit spring 215, the second sealing seat 217 is displaced towards the first knob 213, so that a gap appears between the driven rod 218 and the second sealing block 224. Then, the lubricating oil can move from the second connecting seat 221 to the fixed seat 25 and the self-locking assembly 23, and flow out from the screw connector 24, and finally be injected into the area where the bearing and the pump shaft are located, playing a lubricating role for the bearing and the pump shaft, avoiding dry grinding when the pump shaft rotates, and ensuring the smooth operation of the split-case pump 1;

[0083] After a gap appears between the driven rod 218 and the second sealing block 224, the oil injection device can be used to inject oil into the first conical cavity 225 and the second conical cavity 226 through the oil injection nozzle 227, and the lubricating oil is discharged from the head of the second conical cavity 226 through the through hole on the fixed seat 25;

[0084] When the third connecting seat 231 is connected to the fixed seat 25, the return spring 234 is in a compressed state. When the oil pressure of the lubricating oil in the oil injection assembly 22 is greater than the elastic force generated by the return spring 234, the lubricating oil can push the oil outlet rod 233 to move in the third connecting seat 231, so that it can be discharged from the outlet of the screw connector 24, and the lubricating oil can be injected to the predetermined position.

[0085] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A self-balancing single-stage double-suction split case pump, characterized in that: include: A split-center pump (1) and a motor (5), the motor (5) being connected to a pump shaft in the split-center pump (1) and being used to connect to an impeller of the pump shaft, and an oil injection unit (2) provided on the split-center pump (1) and being used to inject lubricating oil into an area where the pump shaft is located; The oil injection unit (2) comprises a locking assembly (21), an oil injection assembly (22) and a fixing seat (25); A locking assembly (21) connected to the oil injection assembly (22) and used to open the oil injection assembly (22) so that lubricating oil can be transported from the oil injection assembly (22) to the fixing seat (25); An oil injection assembly (22) connected to the fixing seat (25) to form an integrated structure, and used to form a flow channel for lubricating oil; A fixing seat (25) having a through hole for the flow of lubricating oil; The locking assembly (21) comprises a first connecting seat (211), a driving rod (212) and a driven rod (218) arranged in the first connecting seat (211), a transmission seat for connecting the driving rod (212) and the driven rod (218), a limiting ring (214) arranged on the driving rod (212), a limiting spring (215) sleeved on the driving rod (212), and a first knob (213) arranged at one end of the driving rod (212); The transmission seat divides the space in the first connection seat (211) into two cavities, and the cavities are respectively connected to an air inlet nozzle (219); One side of the transmission seat is in contact with a limit spring (215); The position of the driven rod (218) is adjusted by rotating the first knob (213), and then the position of the driven rod (218) is adjusted by the provided air inlet nozzle (219), so that lubricating oil can be injected into the preset position; The transmission seat comprises a first sealing seat (216) and a second sealing seat (217); The first sealing seat (216) is sleeved on the driving rod (212) and is movably connected to the driving rod (212), and the limit spring (215) is connected to the first sealing seat (216); The second sealing seat (217) is sleeved on the driven rod (218); A protrusion is provided on a side of the second sealing seat (217) facing the first sealing seat (216), and a groove matching the protrusion is provided on the first sealing seat (216); The driven rod (218) is provided with a slide groove, and the other end of the driving rod (212) is located in the slide groove of the driven rod (218); By injecting air into the air inlet nozzle (219), the position of the transmission seat in the first connecting seat (211) is adjusted, so that the lubricating oil can be injected.

2. A self-balancing single-stage double-suction split case pump according to claim 1, characterized in that: The oil injection assembly (22) comprises a second connecting seat (221) connected to the first connecting seat (211), an oil injection nozzle (227) arranged on the second connecting seat (221), a first tapered cavity (225) and a second tapered cavity (226) opened on the second connecting seat (221), and a second sealing block (224) arranged at the head position of the second tapered cavity (226); The oil outlet of the oil injection nozzle (227) is in communication with the second tapered cavity (226); The free end of the driven rod (218) is a truncated cone-shaped structure; the driven rod (218) sequentially passes through the first tapered cavity (225) and the second tapered cavity (226) and abuts against the second sealing block (224); The head of the first tapered cavity (225) is connected to the bottom of the second tapered cavity (226).

3. A self-balancing single-stage double-suction split case pump according to claim 2, characterized in that: The oil injection assembly (22) comprises a first sealing block (222) sleeved on the driven rod (218), and a second knob (223) abutting against the first sealing block (222) and threadedly connected to the second connecting seat (221); The first sealing block (222) extends from the bottom of the first conical cavity (225) into the first conical cavity (225), and the deformation of the first sealing block (222) is adjusted by turning the second knob (223); The second connecting seat (221) is provided with a U-shaped groove, and the second knob (223) is located in the U-shaped groove.

4. A self-balancing single-stage double-suction split case pump according to claim 1, characterized in that: The oil injection unit (2) further comprises a self-locking component (23) connected to the fixing seat (25), and a screw connection component (24) connected to the self-locking component (23); The self-locking assembly (23) comprises a third connecting seat (231) threadedly connected to the fixing seat (25), the third connecting seat (231) being provided with an adjusting cavity, a adjusting valve core located in the adjusting cavity, and two third sealing blocks (232) arranged at both ends of the adjusting valve core.

5. A self-balancing single-stage double-suction split case pump according to claim 4, characterized in that: The regulating valve core comprises an oil outlet rod (233), a return spring (234) sleeved on the oil outlet rod (233), and a connecting plate (235) connected to the return spring (234) and arranged on the oil outlet rod (233); The regulating cavity comprises three circular through holes of different diameters and sequentially forms a first shoulder and a second shoulder in a direction away from the fixing seat (25); one end of the return spring (234) abuts against the second shoulder; and the first shoulder is used to limit the moving distance of the connecting plate (235); The connecting plate (235) is a cross-shaped structure.

6. A self-balancing single-stage double-suction split case pump according to claim 1, characterized in that: The water inlet end of the split-center pump (1) is also provided with a filter unit (3) and a filter valve (4) connected to the filter unit (3); The filter valve (4) comprises a T-shaped valve seat (41), a first guide plate (42) arranged at the water inlet end of the valve seat (41), a second guide plate (43) located at the water outlet end of the valve seat (41), and a screw plug (44) arranged at the bottom of the T-shaped valve seat (41) and screwed to the valve seat (41); An inclined surface is provided on one end of the first guide plate (42) close to the screw plug (44), and the second guide plate (43) is an arc-shaped structure.

7. A self-balancing single-stage double-suction split case pump according to claim 6, characterized in that: The filter unit (3) comprises a housing (31) for connecting the valve seat (41) and the split-center pump (1), a plurality of reinforcing ribs evenly arranged on the inner wall of the housing (31), an inner cylinder (32) connected to the reinforcing ribs, a driving unit built into the inner cylinder (32), a movable seat (38) connected to the driving unit, and a filter screen (39) connected to the movable seat (38); The inner cylinder (32) is a U-shaped structure, and its bottom is located at the water inlet end of the outer shell (31).

8. A self-balancing single-stage double-suction split case pump according to claim 7, characterized in that: The driving part comprises an adjusting hand wheel (33), an adjusting rod (34) connected to the adjusting hand wheel (33), a transmission member (35) sleeved on the adjusting rod (34), and a movable rod (36) movably connected to the transmission member (35); One end of the movable rod (36) is connected to the movable seat (38); The outer wall of the movable seat (38) is also provided with a slide rail (37), and a movable groove slidably connected to the slide rail (37) and located on the inner wall of the inner cylinder (32); One end of the adjusting rod (34) extends into the inner cylinder (32) and is connected to the inner wall of the inner cylinder (32).

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