CN215719473U

CN215719473U - Pump body with good heat dissipation performance and internal gear pump

Info

Publication number: CN215719473U
Application number: CN202121463883.1U
Authority: CN
Inventors: 王全锁; 王保国; 杨太康; 郑向军
Original assignee: Shanxi Scenery Machinery Manufacturing Co ltd
Current assignee: Shanxi Scenery Machinery Manufacturing Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-02-01
Anticipated expiration: 2031-06-30

Abstract

The utility model relates to the technical field of hydraulic pumps, in particular to a pump body with good heat dissipation performance and an internal gear pump. The utility model optimizes the unreasonable part of the existing gear pump leakage oil path, and arranges an oil drainage groove for collecting the internal leakage oil aiming at the radial leakage between the gear ring and the inner wall of the pump body, so as to discharge the high-temperature oil discharged from the internal leakage part and avoid the high-temperature oil from entering the low-pressure cavity to form the internal circulation of the pump.

Description

Pump body with good heat dissipation performance and internal gear pump

Technical Field

The utility model relates to the technical field of hydraulic pumps, in particular to a pump body with good heat dissipation performance and an internal gear pump.

Background

In order to respond to the requirements of energy conservation and emission reduction in China, the industrial hydraulic pressure is also transformed towards the energy conservation direction. The electro-hydraulic servo system is more and more emphasized and used by the mechanical industries such as injection molding machines, die casting machines, shoe leather machines, hydraulic machines and the like because of the good energy-saving effect. The oil pump has higher requirements on the oil pump used by the servo system, can adapt to the working conditions of high and low speed and high and low pressure switching of the electro-hydraulic servo system, and can realize pressure maintaining through the oil pump when the output flow is zero. The biggest obstacle to be overcome by the low-speed pressure maintaining of the oil pump is the problem of temperature rise.

When the pump is in a low-speed pressure maintaining state, no oil is output from the outlet, and due to the existence of internal leakage, part of oil in the inner cavity of the oil pump is always subjected to high-low pressure conversion to supplement the internal leakage of the pump, and the part of oil continuously converts hydraulic energy into heat energy in a short time, so that the temperature of the pump is rapidly increased in a short time, a sealing element is caused to lose efficacy, and the pump is damaged.

In order to solve the above problems, attempts have been made to increase the circulation of oil by opening an external leakage passage, thereby achieving the purpose of heat dissipation. For example, the gear pump disclosed in the chinese patent ZL2019221256054 has a structure similar to that of the gear pump in which an oil drain groove is formed in a front pump cover, an oil passage is formed in a transmission shaft, and an oil drain hole is formed in a rear pump cover, so that an oil drain passage is formed, and hot oil is drained to achieve the purpose of rapid heat dissipation. However, in practical use, the heat dissipation structure is prone to the following problems: 1. because the axial leakage amount of the gear pump is small, the leakage amount of the front pump cover and the rear pump cover is not enough to discharge enough high-temperature oil liquid when the gear pump runs at a low speed, and therefore the preset cooling effect cannot be achieved; 2. the more serious problem lies in that although the rear pump cover is provided with the oil leakage hole, the oil leakage hole is actually communicated with the oil inlet through the bearing lubrication hole, in the actual operation process, the external leakage amount at the oil leakage hole is extremely low, under the actual measurement low rotating speed, the external leakage amount is even lower than 20%, most of internal oil leakage still continuously circulates repeatedly in the pump body, high temperature is generated, and the heat dissipation effect cannot be achieved. The above problems greatly reduce the heat dissipation effect, and particularly reduce the heat dissipation efficiency at low rotation speed.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a pump body with good heat dissipation performance and an internal gear pump.

The technical scheme adopted by the utility model is as follows: the utility model provides a pump body that possesses good heat dispersion, includes oil inlet, oil-out, oil inlet, oil-out correspond at pump body inner wall and are provided with the oil trap, and the oil trap side-opening that pump body medial surface oil-out corresponds has the draining groove, the pump body is opened has the outer oil leak hole that communicates the draining groove.

The pump body with good heat dissipation performance is characterized in that: the oil drainage grooves are arranged on two sides of the oil collecting groove corresponding to the oil outlet in parallel.

A pump body with good heat dissipation performance is characterized in that: the pump body is axially provided with a communicating oil duct, each oil drainage groove is respectively provided with a communicating hole connected with the communicating oil duct, and the outer oil leakage hole is communicated with the connecting oil duct, so that each oil drainage groove is communicated with the outer oil leakage hole.

The pump body with good heat dissipation performance is characterized in that: the length of the oil drainage groove is greater than that of the oil collection groove corresponding to the oil outlet.

Crescent gear pump, including the pump body, front end housing, rear end cap, be provided with the transmission shaft of external tooth, be provided with the ring gear of internal tooth, characterized by: the oil ports of the outer wall of the gear ring are circumferentially and uniformly distributed, and the oil ports which are circumferentially distributed are matched with the oil collecting grooves corresponding to the oil outlets of the pump body.

The internal gear pump is characterized in that: the ring gear is provided with two sets of oil ports in the circumferential direction, corresponds to two oil collecting grooves communicated with the oil outlets, and is provided with 3 oil draining grooves which are respectively positioned at two sides and the middle position of the two oil collecting grooves communicated with the oil outlets.

The utility model optimizes the unreasonable position of the existing gear pump leakage oil path, and further researches on the leakage point of the gear pump show that the radial leakage of the gear pump between the gear ring and the inner wall of the pump body accounts for more than 80% of the total leakage amount and almost comes from a high-pressure area at one side of the oil outlet, so that an oil drainage groove for collecting internal leakage oil is arranged at the leakage point, the internal leakage high-temperature oil at the position is discharged, the high-temperature oil is prevented from entering a low-pressure cavity to form pump internal circulation, compared with the existing leakage structure, the effective leakage amount is greatly increased, the external leakage amount can also ensure that heat is discharged in time even in the low-speed pressure maintaining work, the overheating problem is avoided, the running stability of the pump is greatly increased, and the failure rate is reduced.

Drawings

FIG. 1 is a view of the external form of a crescent gear pump of the present invention;

FIG. 2 is an exploded view of the crescent gear pump of the present invention;

FIG. 3 is a schematic view of the pump body structure of the present invention;

FIG. 4 is a front view of the pump body of the present invention;

FIG. 5 is a schematic cross-sectional view A-A of the pump body of the present invention;

FIG. 6 is another schematic view of the pump body according to the present invention.

In the figure: 1-pump body, 11-oil inlet, 12-oil outlet, 13-oil outlet and oil collecting tank, 14-oil draining tank, 15-connecting oil channel, 16-external oil draining hole, 17-communicating hole, 18-low pressure area, 19-high pressure area, 2-front end cover, 3-rear end cover, 4-transmission shaft, 41-external teeth and 42-gear ring.

Detailed Description

As shown in fig. 1, the internal gear pump includes a pump body 1, a front end cap 2, a rear end cap 3, and a transmission shaft 4. As shown in fig. 2, the transmission shaft 4 is provided with external teeth 41, the outer surface of the pump body 1 is respectively provided with an oil inlet 11 and an oil outlet 12, a gear ring 42 which is matched with the external teeth 41 and is provided with internal teeth is arranged in the pump body 1, and an external tooth floating block and an internal tooth floating block are arranged between the external teeth 41 and the gear ring 42. The ring gear 42 is provided with oil ports 43 which are divided into 2 groups and circumferentially and evenly distributed. As shown in fig. 3-5, the inner wall of the pump body 1 is divided into a low pressure region 18 and a high pressure region 19 corresponding to the oil inlet and the oil outlet, and 2 sets of oil ports are circumferentially and uniformly distributed corresponding to the oil outlets, 2 oil outlet oil sumps 13 are circumferentially arranged on the inner side surface of the high pressure region of the pump body 1, two oil outlet oil sumps are communicated with the oil outlet 12, 3 oil drainage grooves 14 are further arranged on the inner side surface of the pump body 1, and the oil drainage grooves 14 are parallel to the oil outlet oil sumps 13.

As shown in fig. 4 and 5, an axial communication oil duct 15 and a radial outer oil leakage hole 16 are formed in one side wall of the pump body 1, 3 oil drainage grooves are respectively provided with a communication hole 17 to be connected with the communication oil duct 15, the outer oil leakage hole 16 is communicated with the connection oil duct 15, so that each oil drainage groove is communicated with the outer oil leakage hole, and an oil port of the communication oil duct 15 on the end face of the pump body 1 is sealed by using a high-pressure plug during assembly.

When the gear pump operates, high-temperature oil is leaked in the oil outlet and oil collecting groove 13, the leaked oil is almost collected by the oil draining grooves arranged on two sides of the oil collecting groove, the oil is prevented from flowing into the low-pressure area to form pump internal circulation, and finally is discharged from the outer oil draining hole 16, so that heat is successfully carried away from the pump body.

As shown in fig. 6, for some special pump body shapes or special process requirements and structural requirements, the communication holes 17 of the oil drainage grooves at two ends in the pump body 1 can also be directly processed by directly opening radial through holes at the outer side, and during assembly, the oil ports outside the pump body are sealed by the communicating oil duct 15 and the communication holes 17 at two ends during processing by adopting a spherical expansion type plug.

Claims

1. The utility model provides a pump body that possesses good heat dispersion, includes oil inlet, oil-out, oil inlet, oil-out are provided with oil trap, characterized by respectively at the low-pressure region that pump body inner wall corresponds, high-pressure region: in the high-pressure area, an oil drainage groove is formed beside an oil collecting groove corresponding to an oil outlet on the inner side surface of the pump body, and an outer oil drainage hole communicated with the oil drainage groove is formed in the pump body.

2. The pump body with good heat dissipation performance of claim 1, wherein: the oil drainage grooves are arranged on two sides of the oil collecting groove corresponding to the oil outlet in parallel.

3. The pump body with good heat dissipation performance according to claim 2, wherein: the pump body is axially provided with a communicating oil duct, each oil drainage groove is respectively provided with a communicating hole connected with the communicating oil duct, and the outer oil leakage hole is communicated with the connecting oil duct, so that each oil drainage groove is communicated with the outer oil leakage hole.

4. The pump body with good heat dissipation performance according to claim 2, wherein: the length of the oil drainage groove is greater than that of the oil collection groove corresponding to the oil outlet.

5. An internal gear pump using the pump body with excellent heat dissipation performance according to any one of claims 1 to 4, comprising a pump body, a front end cover, a rear end cover, a transmission shaft provided with external teeth, and a ring gear provided with internal teeth, wherein: the oil ports of the outer wall of the gear ring are circumferentially and uniformly distributed, and the oil ports which are circumferentially distributed are matched with the oil collecting grooves corresponding to the oil outlets of the pump body.

6. An internal gear pump according to claim 5, wherein: the ring gear is provided with two sets of oil ports in the circumferential direction, corresponds to two oil collecting grooves communicated with the oil outlets, and is provided with 3 oil draining grooves which are respectively positioned at two sides and the middle position of the two oil collecting grooves communicated with the oil outlets.