CN219549117U - Shielding gear pump - Google Patents

Abstract

The utility model relates to the technical field of gear pumps, in particular to a shielding gear pump which comprises a motor and a double gear pump arranged at the driving end of the motor, wherein a low-pressure area and a high-pressure area are formed in a gear cavity of the double gear pump, an overcurrent gap communicated with the high-pressure area is formed between a rotor and a stator of the motor, a shaft hole communicated with the overcurrent gap is formed in a main shaft of the motor, an outlet end of the shaft hole is communicated with the gear cavity, and the pressure of the outlet end is lower than that of the high-pressure area; the utility model can effectively reduce the temperature in the motor, further ensure that the motor is at a proper working temperature and reduce the probability of burning loss of the motor.

Description

Shielding gear pump

Technical Field

The utility model relates to the technical field of gear pumps, in particular to a shielding gear pump.

Background

The gear pump is one kind of volumetric pump, comprises two gears, pump body and front and back lid two enclosure spaces, and when the gear rotated, the volume of the space of gear disengagement side became big from the weak point, forms the vacuum, inhales liquid, and the volume of the space of gear meshing side becomes small from the weak point, and gets into the pipeline with liquid extrusion.

In the running process of the gear pump, certain heat can be generated inside the motor, and the effective power of the motor can be reduced due to continuous accumulation of the heat, so that the working efficiency of the motor is reduced. Thus, in order to reduce the temperature of the motor, many designers use a circulating liquid cooling mode to cool the motor. The conventional cooling mode is to set a water cooling channel on the shell of the motor and drive the fluid to continuously flow through the water cooling channel so as to take away the heat generated by the water pump. The water cooling mode has a good heat dissipation effect, so that the water cooling mode is widely used, and the patent 201510240099.7 adopts the following specific structure: the motor power mechanism is fixed in the inner cylinder of the double-wall sleeve, and the centrifugal pump body is fixed in the bottom cylinder forming the double-wall sleeve and is coaxially connected with the motor power mechanism; the water inlet and the water outlet are respectively arranged on the outer wall of the double-wall sleeve body. ". The water cooling channel is formed in the water pump shell to be corresponding to the water pump for heat dissipation, so that the heat dissipation effect is good, but some technical problems occur in the long-term use process. Through temperature measuring device detection, it is found that the temperature on the surface layer of the water pump is obviously reduced, but the reduction of the internal temperature of the water pump is small, particularly in a high-power working state, the rotor and the stator in the water pump still heat seriously, the heat dissipation rate is extremely low, and the working efficiency of the water pump is seriously affected, so that the problem needs to be solved. Thus, there is a need for a solution.

Disclosure of Invention

In order to avoid and overcome the technical problems in the prior art, the utility model provides a shielding gear pump. The utility model can effectively reduce the temperature in the motor, further ensure that the motor is at a proper working temperature and reduce the probability of burning loss of the motor.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a shielding gear pump, includes the motor and arranges the double gear pump at the motor drive end, the gear intracavity of double gear pump is formed with low pressure district and high pressure district, be formed with the overflow clearance with the high pressure district intercommunication between the rotor and the stator of motor, offered the shaft hole with overflow clearance intercommunication on the main shaft of motor, the exit end and the gear chamber intercommunication in shaft hole, and the pressure of exit end is less than the pressure in high pressure district.

As still further aspects of the utility model: the shell of the motor comprises a cylinder body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are covered at two ends of the cylinder body, the tail end of the main shaft is assembled in a rear mounting hole formed in the rear end cover through a second bearing, and an overflow hole for communicating the shaft hole and the overflow gap is formed in the rear mounting hole; the front end of the main shaft is rotationally connected with the front end cover through a first bearing, and the front end cover is provided with a drainage hole which is connected with a through flow gap and a high-pressure area; the inner ring of the first bearing is provided with a diversion trench communicated with the gear cavity, and the outlet end of the shaft hole is communicated with the diversion trench.

As still further aspects of the utility model: the double gear pump comprises a gear sleeve which is arranged on the outer side of the front end cover in a sealing mode, a pump cover is arranged on the outer side of the gear sleeve in a sealing mode, and the front end cover, the gear sleeve and the pump cover enclose to form the gear cavity.

As still further aspects of the utility model: the inner side of the pump cover is provided with a main shaft mounting hole with a counter bore structure, the axes of the main shaft mounting hole and the main shaft axis are parallel to each other, and the front end of the main shaft penetrates through the main gear and stretches into the corresponding main shaft mounting hole; the front end cover is also provided with a secondary shaft mounting hole, and the secondary gear is rotatably mounted in the corresponding secondary shaft mounting hole through a secondary shaft.

As still further aspects of the utility model: an overflow hole communicated with the drainage hole is formed in the side wall of the auxiliary shaft mounting hole on the front end cover.

As still further aspects of the utility model: a stator shielding sleeve is arranged on the inner side of the stator, and a rotor shielding sleeve is arranged on the outer side of the rotor.

As still further aspects of the utility model: the spindle and the drive gear are connected to each other by a key fit.

As still further aspects of the utility model: the first bearing is a thrust bearing.

As still further aspects of the utility model: the shaft hole is an axle center counter bore structure arranged along the axis of the main shaft, and the bottom of the axle center counter bore is provided with a communication hole which axially extends along the radial direction of the main shaft, and the communication hole and the diversion trench are mutually communicated.

Compared with the prior art, the utility model has the beneficial effects that:

1. when the motor works, the stator is electrified to generate a changing magnetic field and drive the rotor to rotate, so that the main shaft rotates along with the rotor and drives the main gear to rotate, and the main gear and the auxiliary gear are meshed to rotate. The gear set and the gear cavity are matched with each other to apply work to the medium in the runner, and a high-pressure medium is formed in the high-pressure area. A portion of the medium in the high pressure region is discharged from the pump through the outlet; and a part of flow passes through the drainage hole, the overflow gap, the overflow hole, the shaft hole, the communication hole and the diversion groove from the high-pressure area, then reenters the gear cavity, lubricates and cools the first bearing and the second bearing, and is used for discharging gas accumulated in the motor. And part of the medium flows through the overflow hole and enters the main shaft mounting hole, so that the dry grinding phenomenon of the front end of the main shaft and the auxiliary shaft is prevented, and the medium is directly contacted with the motor, thereby being beneficial to heat dissipation of the motor. The guiding gutter that sets up on the first bearing is favorable to the medium circulation, has promoted the self-lubricating ability of equipment, effectively prevents the wearing and tearing of first bearing.

2. Through linking together motor and dual gear pump, and fix main gear and rotor through same main shaft, very big simplification main and auxiliary gear and motor between be connected to make the length of main shaft shorten greatly, reach the purpose of reducing the pump volume, still be favorable to reducing the beating of main shaft simultaneously, with the wearing and tearing that reduce gear, bearing, make the longer life and the higher operational reliability that the product obtained, and solved the easy problem of leaking that exists because of moving seal in the traditional gear pump.

3. Through the cooperation of stator shielding cover and rotor shielding cover, form the overflow clearance that is linked together with the overflow pump body internal flow way, the heat that the motor produced is taken away through the flow clearance to the medium flow, reaches the radiating effect of liquid cooling, has solved the radiating problem of traditional motor.

4. Through seting up the axle center hole in the main shaft, the medium backward flow of guiding the end is convenient for to gear train department to form stable medium circulation, make the medium that draws forth from gear train high-pressure region constantly flow through the flow clearance and from the downthehole backward flow of centre, promote the liquid cooling performance, solved traditional motor's heat dissipation problem effectively, circulated medium simultaneously also is convenient for discharge the gas of accumulating in the runner, prevents the dry grinding of cooperation bearing.

5. The detachable connection of the main gear and the main shaft is convenient for the disassembly of the pump body, is beneficial to improving the maintenance operability of the gear set, and is beneficial to optimizing the processing technology of the main gear, the main shaft and the rotor assembly.

6. The first bearing is a thrust bearing, and the thrust bearing is arranged on the main shaft, so that the main shaft is limited by the thrust bearing and the axial force on the main shaft is balanced in the axial movement process of the main shaft.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view of the internal cross-sectional structure of the present utility model.

Fig. 3 is a schematic structural view of a front end cover in the present utility model.

Fig. 4 is a schematic structural view of a pump cover according to the present utility model.

FIG. 5 is a schematic diagram of a gear set according to the present utility model.

Fig. 6 is a schematic structural view of a stator and a rotor according to the present utility model.

Fig. 7 is a schematic structural diagram of the main gear and the main shaft in the present utility model.

Fig. 8 is an enlarged schematic view of fig. 2 at a.

In the figure:

10. double gear pumps; 11. a pump cover; 12. a gear sleeve; 121. a low pressure zone; 122. a high pressure region; 13. a main gear; 14. a pinion gear; 15. a countershaft mounting hole; 17. an inlet; 18. an outlet;

20. a motor; 21. a housing; 211. a front end cover; 212. a cylinder; 213. a rear end cover; 214. a first bearing; 215. a second bearing; 216. drainage holes; 217. an overflow hole; 218. an overflow aperture; 22. a main shaft; 221. a shaft hole; 23. a secondary shaft; 24. a stator; 241. a stator shield; 242. a stator potting layer; 25. a rotor; 251. a rotor shield; 252. a rotor potting layer; 26. an overcurrent gap; 27. a fixing ring; 28. a key slot; 29. a fixed key.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-8, a shielding gear pump comprises a double gear pump 10 and a motor 20, wherein the double gear pump 10 comprises a pump cover 11 and a gear sleeve 12 which are sequentially arranged, an inlet 17 and an outlet 18 are arranged on the pump cover 11, a gear cavity is formed in the gear sleeve 12, a gear set is arranged in the gear cavity, the gear set comprises a main gear 13 and a secondary gear 14, and under the action of the main gear 13 and the secondary gear 14, a high-pressure area 122 and a low-pressure area 121 are formed in the gear cavity; and the pump cover 11 is provided with an inlet 17 communicated with the low-pressure area 121 and an outlet 18 communicated with the high-pressure area 122. The inlet 17, the outlet 18 and the chamber of the gear chamber together form a flow channel.

The housing of the motor 20 includes a cylinder 212, a front end cap 211 and a rear end cap 213 capped at both ends of the cylinder 212, the tail end of the main shaft 22 is assembled in a rear mounting hole formed in the rear end cap 213 through a second bearing 215, and an overflow hole 217 communicating the shaft hole 221 and the overflow gap 26 is formed in the rear mounting hole. The front end of the main shaft 22 is rotatably connected with the front end cover 211 through a first bearing 214, and the front end cover 211 is provided with a drainage hole 216 connected with the flow gap 26 and the high pressure area 122. The inner ring of the first bearing 214 is provided with a diversion trench communicated with the gear cavity, an overcurrent gap 26 is formed between the rotor 25 and the stator 24 of the motor 20, the main shaft 22 of the motor 20 is provided with a shaft hole 221, the shaft hole 221 is of an axle center counter bore structure arranged along the axis of the main shaft 22, the bottom of the axle center counter bore is provided with a communication hole axially extending along the radial direction of the main shaft 22, and the communication hole and the diversion trench are mutually communicated.

The inner side of the pump cover 11 is provided with a main shaft mounting hole and a secondary shaft mounting hole 15, the axes of which are parallel to the axis of the main shaft 22 and are of counter bore structures, and the front end of the main shaft 22 passes through the main gear 13 and stretches into the corresponding main shaft mounting hole. The front end cover 211 is also provided with a counter shaft mounting hole 15, and the counter gear 14 is rotatably mounted in the corresponding counter shaft mounting hole 15 through the counter shaft 23. The side wall of the auxiliary shaft mounting hole 15 on the front end cover 211 is provided with an overflow hole 218 communicated with the drainage hole 216.

The stator 24 is coaxially and fixedly connected to the inner wall of the cylinder 212, and a stator shielding sleeve 241 is arranged on the stator 24. The rotor 25 is coaxially and fixedly connected to the main shaft 22, and a rotor shield 251 is arranged on the rotor 25. An overcurrent gap 26 is formed between the stator shield 241 and the rotor shield 251.

Through setting up gear train and motor 20 in same bi-gear pump 10, and through fixed main gear 13 of same main shaft 22 and rotor 25, very big simplification gear train and motor 20 between be connected, thereby make the length of main shaft 22 shorten greatly, when reaching the purpose of reducing the pump volume, still be favorable to reducing the jump of main shaft 22, with the wearing and tearing of reduction gear, bearing, make the longer life and the higher operational reliability that the product obtained, and solved the easy problem of leaking that exists because of dynamic seal in the traditional gear pump.

The stator 24 and the rotor 25 form a stator encapsulating layer 242 and a rotor 25 encapsulating layer of an insulating medium through encapsulating processing, an overcurrent gap 26 is formed between the stator encapsulating layer 242 and the rotor encapsulating layer 252, and an exhaust valve is arranged on the rear end cover 213 and is used for exhausting redundant gas in the motor 20.

Because stator 24 and rotor 25 adopt the embedment to handle and form stator encapsulating layer 242 and rotor 25 encapsulating layer for motor 20 has bigger area of contact with the medium, and has promoted the heat conduction speed in the motor 20, has increased the heat dispersion of motor 20 effectively, and the electromagnetic loss rate of encapsulating layer is lower, is favorable to promoting the efficiency of motor 20.

The main gear 13 and the auxiliary gear 14 are provided with coaxial fixing rings 27, the main shaft 22 and the auxiliary shaft 23 are provided with key grooves 28, and the fixing rings 27 and the main shaft 22 or the auxiliary shaft 23 are radially fixed through fixing keys 29.

In this embodiment, since the detachable arrangement between the gear and the shaft is convenient for replacing the gear in the later stage, and in the production and assembly process, the production of the main gear 13 and the production of the main shaft 22 and the rotor 25 can be separated, so that the problems that the main shaft 22 and the rotor 25 are difficult to process and the complete machine is difficult to assemble due to the fact that the gear needs to be directly injection molded on the shaft are effectively solved, the main gear 13 and the auxiliary gear 14 are made of PEEK materials and are directly injection molded on the fixed ring 27, the fixed ring 27 is used for replacing the shaft to ensure the accurate positioning in the gear injection molding process, and the detachable design of the gear and the shaft is satisfied while the gear injection molding is not influenced.

The first bearing 214 is a thrust bearing, and the thrust bearing is disposed on the main shaft 22, so that the thrust bearing limits the main shaft 22 and balances the axial force on the main shaft 22 in the axial movement process of the main shaft 22.

When the motor 20 works, the stator 24 is electrified to generate a changing magnetic field and drive the rotor 25 to rotate, so that the main shaft 22 rotates along with the rotor 25 and drives the main gear 13 to rotate, and the main gear 13 is meshed with the auxiliary gear 14 to rotate. The gear set cooperates with the gear cavity to apply work to the medium in the flow path and form a high pressure medium in the high pressure region 122. A portion of the medium in the high pressure region 122 is discharged from the pump through the outlet 18; a portion of the flow from the high pressure region 122 passes through the drain hole 216, the overflow gap 26, the overflow hole 217, the shaft hole 221, the communication hole, the flow guide groove, and then reenters the gear cavity, lubricates and cools the first bearing 214 and the second bearing 215, and is used for discharging the gas accumulated in the motor 20. And a part of the medium flows through the overflow hole 218 and enters the main shaft mounting hole, so that the dry grinding phenomenon of the front end of the main shaft 22 and the auxiliary shaft 23 is prevented, and the medium is directly contacted with the motor 20, thereby facilitating heat dissipation of the motor 20. The guiding gutter that sets up on the first bearing 214 is favorable to the medium circulation, has promoted the self-lubricating ability of equipment, effectively prevents the wearing and tearing of first bearing 214.

The foregoing description is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical solution of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (9)

1. The utility model provides a shielded gear pump, includes motor (20) and arranges dual gear pump (10) at motor (20) drive end, be formed with low pressure zone (121) and high pressure zone (122) in the gear chamber of dual gear pump (10), a serial communication port, be formed with between rotor (25) and stator (24) of motor (20) and high pressure zone (122) the overflow clearance (26) that communicate, offered shaft hole (221) on main shaft (22) of motor (20), the entrance point and the overflow clearance (26) of shaft hole (221) communicate each other, the exit end and the gear chamber intercommunication of shaft hole (221), and this exit end is located the gear chamber department between high pressure zone (122) and low pressure zone (121).

2. The shielding gear pump according to claim 1, wherein the housing of the motor (20) comprises a cylinder (212), a front end cover (211) and a rear end cover (213) which are covered at two ends of the cylinder (212), the tail end of the main shaft (22) is assembled in a rear mounting hole formed in the rear end cover (213) through a second bearing (215), and an overflow hole (217) which is communicated with the shaft hole (221) and the overflow gap (26) is formed in the rear mounting hole; the front end of the main shaft (22) is rotationally connected with the front end cover (211) through a first bearing (214), and the front end cover (211) is provided with a drainage hole (216) which is connected with a flow gap (26) and a high-pressure area (122); and the inner ring of the first bearing (214) is provided with a diversion trench communicated with the gear cavity, and the outlet end of the shaft hole (221) is communicated with the diversion trench.

3. The shielding gear pump according to claim 2, wherein the double gear pump (10) comprises a gear sleeve (12) arranged on the outer side of the front end cover (211) in a sealing mode, a pump cover (11) is arranged on the outer side of the gear sleeve (12) in a sealing mode, and the front end cover (211), the gear sleeve (12) and the pump cover (11) are enclosed to form the gear cavity.

4. A shielding gear pump according to claim 3, characterized in that, a secondary shaft mounting hole (15) and a primary shaft mounting hole which are parallel to each other and have counter bore structures are arranged on the inner side of the pump cover (11), the axes of the secondary shaft mounting hole and the primary shaft (22) are parallel to each other, and the front end of the primary shaft (22) passes through the primary gear (13) and extends into the corresponding primary shaft mounting hole; the front end cover (211) is also provided with a secondary shaft mounting hole (15), and the secondary gear (14) is rotatably mounted in the corresponding secondary shaft mounting hole (15) through a secondary shaft (23).

5. The shielded gear pump of claim 4, wherein the side wall of the auxiliary shaft mounting hole (15) of the front end cover (211) is provided with an overflow hole (218) communicated with the drainage hole (216).

6. A shielded gear pump according to any of claims 1-5, characterized in that the stator (24) is provided with a stator shield (241) on the inside and a rotor shield (251) on the outside of the rotor (25).

7. A gear pump according to claim 5, characterized in that the main shaft (22) and the driving gear are connected to each other by means of a key fit.

8. A gear pump according to claim 4, characterized in that the pump cover (11) is provided with an inlet (17) communicating with the low pressure area (121) and an outlet (18) communicating with the high pressure area (122), respectively.

9. The shielding gear pump as set forth in claim 4, wherein the shaft hole (221) is an axial countersink structure disposed along the axis of the main shaft (22), and the axial countersink bottom is provided with a communication hole extending radially along the main shaft (22), and the communication hole and the diversion trench are communicated with each other.