CN216381832U

CN216381832U - Internal gear pump

Info

Publication number: CN216381832U
Application number: CN202123321697.7U
Authority: CN
Inventors: 林强兴; 黄杰; 陶凯元
Original assignee: Sanming Suofu Pump Industry Co ltd
Current assignee: Sanming Suofu Pump Industry Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-04-26
Anticipated expiration: 2031-12-27

Abstract

The utility model provides an internal gear pump, which relates to the technical field of gear pumps and comprises the following components: the internal gear, the external gear ring, the front cover, the rear cover, the shaft sleeve, the pump body and the shaft are motion components, the front cover, the rear cover and the shaft sleeve are friction components, the pump body is a structural component, the motion components are made of tungsten carbide alloy materials with high hardness and strength, the friction components are made of zirconium oxide ceramic materials with high hardness and wear resistance, and the structural components with complex structures are made of stainless steel materials which are easy to process, so that the internal gear pump provided by the utility model can reduce the processing cost on the premise of ensuring the product quality not to be influenced.

Description

Internal gear pump

Technical Field

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

Background

The internal gear pump is a positive displacement pump, it is by the front and back lid, outer ring gear and the eccentric internal gear that settles constitute, there is the tooth number difference in internal gear and outer ring gear, at the rotatory in-process of a week of internal gear, constitute the continuous expansion of a plurality of volume between internal gear addendum and the outer ring gear valley and reduce endless confined space, produce the vacuum in pump suction chamber department during the volume expansion, in sucking liquid into the pump, produce pressure in pump discharge chamber department during the volume reduces, discharge liquid outside the pump, the circulation is reciprocal above process, the suction and drainage process of pump has been accomplished promptly.

In order to improve the working performance and the service life of a gear pump in the prior art, the fit clearance in the pump needs to be reduced as much as possible, the wear resistance of working parts of the pump needs to be improved, and high-precision wear-resistant parts are needed. Ceramic or hard alloy materials are mostly adopted in the industry, but because the ceramic and the hard alloy have the characteristics of high strength, high hardness and high brittleness, the traditional machining modes of turning, milling, drilling and the like are difficult to meet the precision requirement, the machining mode can only be processed by a grinding method at first, most structures capable of accurately controlling the size are the excircle diameter, the plate thickness and the like, and the limitation is realized. With the development of machining techniques, machining processes such as chemical machining, electric machining, optical machining, etc. that are currently available are increasing, but machining costs and efficiency are not necessarily advantageous over abrasive dust machining. In view of the requirement of water pump products for strictly controlling the cost to expand the application range of the market, the machining process of ceramics and hard alloy should use the grinding dust as much as possible, however, the existing gear pump adopts ceramics or hard alloy materials for moving components, structural parts and fastening parts, and the machining cost of the gear pump is extremely high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an internal gear pump, which aims to solve the problems in the prior art and reduce the processing cost on the premise of ensuring that the product quality is not influenced.

In order to achieve the purpose, the utility model provides the following scheme:

the present invention provides an internal gear pump, comprising: an internal gear, an outer gear ring, a front cover, a rear cover, a shaft sleeve, a pump body and a shaft, wherein the internal gear is arranged in the outer gear ring and is meshed with teeth in the outer gear ring, the shaft sleeve is sleeved on the periphery of the outer gear ring, a containing cavity for containing the inner gear, the outer gear ring and the shaft sleeve is arranged in the pump body, the shaft sleeve is fixed in the accommodating cavity, the outer gear ring can rotate around the axis of the shaft sleeve, the front cover and the rear cover are respectively arranged at two ends of the accommodating cavity, and the outer gear ring and the inner gear are both abutted against the end faces of the front cover and the rear cover facing the accommodating cavity, one end of the shaft penetrates through the rear cover, extends into the accommodating cavity and is inserted into the shaft hole of the internal gear, the other end of the shaft is in transmission connection with a driving device, and the shaft and the internal gear are relatively fixed along the circumferential direction; the inner gear, the outer gear ring and the shaft are all made of tungsten carbide, the shaft sleeve, the front cover and the rear cover are all made of zirconia, and the pump body is made of stainless steel.

Preferably, a channel is arranged in the pump body, the accommodating cavity is formed by part of the channel, the front cover and the rear cover are arranged in the channel, the outer peripheral surfaces of the front cover, the rear cover and the shaft sleeve are in close contact with the inner peripheral surface of the channel, and the outer peripheral surface of the shaft sleeve is in interference fit with the inner peripheral surface of the channel.

Preferably, both ends of the shaft are provided with first limiting surfaces extending from the end parts to the center of the shaft, the first limiting surfaces are parallel to the central line of the shaft, a second limiting surface matched with the first limiting surfaces is arranged in the shaft hole of the internal gear, the second limiting surfaces extend from one end of the shaft hole to the other end, one end of the shaft is inserted into the shaft hole, the first limiting surfaces are parallel to and contact with the second limiting surfaces, and the first limiting surfaces at the other end of the shaft are used for being matched with corresponding structures on the driving device.

Preferably, the first limiting surfaces at the two ends of the shaft are respectively provided with two, and the second limiting surfaces in the shaft hole are also provided with two.

Preferably, epaxial still the cover is equipped with sealed general stopper, sealed general stopper is located the back lid deviates from holding chamber one side in the passageway, sealed general stopper deviates from one side of back lid is provided with outside and perpendicular to sealed first flange that general stopper axis direction extends, first flange orientation holding chamber one side be provided with in the passageway with first flange matched with second flange, first flange butt in on the second flange.

Preferably, the front cover is provided with a fluid inlet and a fluid outlet which are communicated with the accommodating cavity.

Preferably, the pump body comprises a front sealing cap and a rear pump body, the outer diameters of the front cover, the shaft sleeve, the rear cover and the sealed flooding plug are sequentially reduced, a first sub-channel and a second sub-channel are respectively arranged in the front sealing cap and the rear pump body, the front cover is arranged in the first sub-channel, a third flange extending from the inner wall of the first sub-channel to the center line of the first sub-channel is arranged in the first sub-channel on one side of the front cover, which is far away from the accommodating cavity, the end face, facing the front cover, of the third flange abuts against the front cover, a sealing ring groove is arranged on the end face, facing the front cover, of the third flange, a sealing ring is arranged in the sealing ring groove, the shaft sleeve, the rear cover and the sealed flooding plug are all arranged in the second sub-channel, one end of the rear pump body is inserted into one end of the front sealing cap, and a second sealing ring is arranged at the joint of the rear pump body and the front sealing cap.

Compared with the prior art, the utility model has the following technical effects:

the present invention provides an internal gear pump comprising: the internal gear, the external gear ring, the front cover, the rear cover, the shaft sleeve, the pump body and the shaft are motion components, the front cover, the rear cover and the shaft sleeve are friction components, and the pump body is a structural component.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a cross-sectional view of a crescent gear pump provided in accordance with the present invention;

FIG. 2 is an external view of a crescent gear pump according to the present invention;

FIG. 3 is a schematic view of the assembled shaft, inner gear, outer ring gear and sleeve;

FIG. 4 is a schematic view of the assembled structure of the shaft, the internal gear, the external gear ring, the front cover, the rear cover, the seal plug and the shaft sleeve;

FIG. 5 is a schematic view of the rear pump body and its internal components;

FIG. 6 is a schematic view of the shaft construction;

in the figure: 1-pump body, 2-shaft, 3-shaft sleeve, 4-external gear ring, 5-internal gear, 6-front cover, 7-rear cover, 8-sealing flooding plug, 9-sealing ring groove, 11-rear pump body, 12-front sealing cap, 61-fluid inlet and 62-fluid outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The present invention provides an internal gear pump, as shown in fig. 1 to 6, including: an internal gear 5, an outer gear ring 4, a front cover 6, a rear cover 7, a shaft sleeve 3, a pump body 1 and a shaft 2, wherein the internal gear 5 is arranged in the outer gear ring 4 and is meshed with teeth in the outer gear ring 4, the internal gear 5 is eccentrically arranged in the outer gear ring 4, the shaft sleeve 3 is sleeved on the periphery of the outer gear ring 4, a containing cavity for containing the internal gear 5, the outer gear ring 4 and the shaft sleeve 3 is arranged in the pump body 1, the shaft sleeve 3 is fixed in the containing cavity, the outer gear ring 4 can rotate around the axis of the shaft sleeve 3, the front cover 6 and the rear cover 7 are respectively arranged at two ends of the containing cavity, the outer gear ring 4 and the internal gear 5 are respectively abutted against end faces of the front cover 6 and the rear cover 7 facing the containing cavity, the outer gear ring 4 and the internal gear 5 can rotate relative to the front cover 6 and the rear cover 7, one end of the internal gear shaft 2 penetrates through the rear cover 7, extends into the containing cavity and is inserted into a shaft hole of the internal gear 5, and the other end is used for being in transmission connection with a driving device, the shaft 2 and the internal gear 5 are relatively fixed along the circumferential direction; the internal gear 5, the external gear ring 4 and the shaft 2 are all made of tungsten carbide, the shaft sleeve 3, the front cover 6 and the rear cover 7 are all made of zirconium oxide, the pump body 1 is made of stainless steel, the internal gear 5 and the external gear ring 4 have a tooth number difference, in the process that the internal gear 5 rotates for a circle, a plurality of closed spaces with continuously enlarged and reduced volumes are formed between tooth crests of the internal gear 5 and tooth valleys of the external gear ring 4, a vacuum degree is generated at a pump suction cavity when the volumes are enlarged, liquid is sucked into the pump, pressure is generated at a pump discharge cavity when the volumes are reduced, the liquid is discharged outside the pump, and the above processes are cyclically repeated, namely, the liquid suction and discharge process of the pump is completed; when the device is used, the driving shaft 2 of the driving device rotates, and the shaft 2 drives the inner gear 5 and the outer gear ring 4 to rotate so as to realize the liquid suction and discharge process.

The present invention provides an internal gear pump comprising: the internal gear pump comprises an internal gear 5, an external gear ring 4, a front cover 6, a rear cover 7, a shaft sleeve 3, a pump body 1 and a shaft 2, wherein the internal gear 5, the external gear ring 4 and the shaft 2 are motion components, the front cover 6, the rear cover 7 and the shaft sleeve 3 are friction components, and the pump body 1 is a structural component, so that the motion components are made of tungsten carbide which is an alloy material with high hardness and strength, the friction components are made of zirconia which is a ceramic material with high hardness and wear resistance, and the structural component with a complex structure is made of stainless steel which is easy to process.

Further, be provided with the passageway in the pump body 1, the holding chamber is formed by partial passageway, and protecgulum 6 and hou gai 7 all set up in the passageway, and the outer peripheral face of protecgulum 6, hou gai 7 and axle sleeve 3 all with the inner peripheral surface in close contact with of passageway, and the outer peripheral face of axle sleeve 3 and passageway inner peripheral surface be interference fit, the simple easy operation of assembling process, and protecgulum 6, hou gai 7 are circular, and axle sleeve 3 is the ring shape, and circular and ring shape structure processing is simple.

Furthermore, both ends of the shaft 2 are provided with a first limiting surface extending from the end part to the center of the shaft 2, the first limiting surface is parallel to the central line of the shaft 2, a second limiting surface matched with the first limiting surface is arranged in the shaft hole of the internal gear 5, the second limiting surface extends from one end of the shaft hole to the other end, after one end of the shaft 2 is inserted into the shaft hole, the first limiting surface is parallel to and contacts with the second limiting surface, so as to realize that the shaft 2 drives the inner gear 5 to rotate, the first limit surfaces at the other end of the shaft 2 are matched with corresponding structures on the driving device, preferably, two first limit surfaces are arranged at both ends of the shaft 2, two second limit surfaces in the shaft hole are also arranged, compared with the existing key groove type structure, the limit surface structure is easier to process, and the axial positioning of the shaft 2, the internal gear 5 and the external ring gear 4 is achieved by cooperation with the front cover 6 and the rear cover 7.

Further, it is equipped with sealed general stopper 8 still to overlap on the axle 2, and sealed general stopper 8 is located the passageway that back lid 7 deviates from holding chamber one side, and sealed general stopper 8 deviates from one side of back lid 7 and is provided with the first flange that extends to outside and perpendicular to sealed general stopper 8 axis direction, and first flange is provided with the second flange with first flange matched with in the passageway of holding chamber one side towards, and first flange butt is on the second flange, and sealed general stopper 8 is as the shaft dynamic seal.

Further, the front cover 6 is provided with a fluid inlet 61 and a fluid outlet 62 which are communicated with the accommodating cavity, the fluid inlet 61 realizes liquid suction, and the fluid outlet 62 realizes liquid discharge.

Further, the pump body 1 comprises a front sealing cap 12 and a rear pump body 11, the outer walls of the front sealing cap 12 and the rear pump body 11 are on the same cylindrical surface, the outer diameters of the front cover 6, the shaft sleeve 3, the rear cover 7 and the seal flooding plug 8 are sequentially reduced, a first sub-channel and a second sub-channel are respectively arranged in the front sealing cap 12 and the rear pump body 11, the front cover 6 is arranged in the first sub-channel, a third flange extending from the inner wall of the first sub-channel to the center line of the first sub-channel is arranged in the first sub-channel on the side of the front cover 6 departing from the accommodating cavity, the end surface of the third flange facing the front cover 6 is abutted against the front cover 6, a seal ring groove 9 is arranged on the end surface of the third flange facing the front cover 6, a seal ring is arranged in the seal ring groove 9, the shaft sleeve 3, the rear cover 7 and the seal flooding plug 8 are all arranged in the second sub-channel, one end of the rear pump body 11 is inserted into one end of the front sealing cap 12, and a second seal ring is arranged at the joint of the rear pump body 11 and the front cap 12, as shown in the figure, the pump body 1 is designed into a split structure, so that a channel in the pump body 1 is conveniently machined, the inner wall of the channel can be matched with each moving component and each friction component in the channel, and the sealing ring is static sealing.

The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.

Claims

1. An internal gear pump, characterized in that: the method comprises the following steps: an internal gear, an outer gear ring, a front cover, a rear cover, a shaft sleeve, a pump body and a shaft, wherein the internal gear is arranged in the outer gear ring and is meshed with teeth in the outer gear ring, the shaft sleeve is sleeved on the periphery of the outer gear ring, a containing cavity for containing the inner gear, the outer gear ring and the shaft sleeve is arranged in the pump body, the shaft sleeve is fixed in the accommodating cavity, the outer gear ring can rotate around the axis of the shaft sleeve, the front cover and the rear cover are respectively arranged at two ends of the accommodating cavity, and the outer gear ring and the inner gear are both abutted against the end faces of the front cover and the rear cover facing the accommodating cavity, one end of the shaft penetrates through the rear cover, extends into the accommodating cavity and is inserted into the shaft hole of the internal gear, the other end of the shaft is in transmission connection with a driving device, and the shaft and the internal gear are relatively fixed along the circumferential direction; the inner gear, the outer gear ring and the shaft are all made of tungsten carbide, the shaft sleeve, the front cover and the rear cover are all made of zirconia, and the pump body is made of stainless steel.

2. A crescent gear pump according to claim 1, wherein: the pump body is internally provided with a channel, the accommodating cavity is formed by part of the channel, the front cover and the rear cover are arranged in the channel, the outer peripheral surfaces of the front cover, the rear cover and the shaft sleeve are in close contact with the inner peripheral surface of the channel, and the outer peripheral surface of the shaft sleeve is in interference fit with the inner peripheral surface of the channel.

3. A crescent gear pump according to claim 1, wherein: the both ends of axle all are provided with from the tip to the first spacing face that the center of axle extends, first spacing face with the central line of axle is parallel, be provided with in the shaft hole of internal gear with the spacing face of first spacing face matched with second, the spacing face of second certainly the one end in shaft hole extends to the other end, the one end of axle is inserted the downthehole back of axle, first spacing face with the spacing face of second is parallel, the contact, the first spacing face of the axle other end is used for cooperateing with drive arrangement's last corresponding structure.

4. A crescent gear pump according to claim 3, wherein: the first limiting surfaces at the two ends of the shaft are provided with two, and the second limiting surfaces in the shaft hole are also provided with two.

5. A crescent gear pump according to claim 2, wherein: the epaxial still cover of cover is equipped with sealed general stopper, sealed general stopper is located back lid deviates from holding chamber one side in the passageway, sealed general stopper deviate from one side of back lid is provided with outside and perpendicular to sealed first flange that extends of general stopper axis direction, first flange orientation holding chamber one side be provided with in the passageway with first flange matched with second flange, first flange butt in on the second flange.

6. A crescent gear pump according to claim 1, wherein: and the front cover is provided with a fluid inlet and a fluid outlet which are communicated with the accommodating cavity.

7. A crescent gear pump according to claim 5, wherein: the pump body comprises a front sealing cap and a rear pump body, the outer diameters of the front cover, the shaft sleeve, the rear cover and the sealed flooding plug are sequentially reduced, a first sub-channel and a second sub-channel are respectively arranged in the front sealing cap and the rear pump body, the front cover is arranged in the first sub-channel, a third flange extending from the inner wall of the first sub-channel to the center line of the first sub-channel is arranged in the first sub-channel on one side of the front cover, which is far away from the accommodating cavity, the end face of the third flange, which faces the front cover, is abutted against the front cover, a sealing ring groove is arranged on the end face of the third flange, which faces the front cover, a sealing ring is arranged in the sealing ring groove, the shaft sleeve, the rear cover and the sealed flooding plug are all arranged in the second sub-channel, and one end of the rear pump body is inserted into one end of the front sealing cap, and a second sealing ring is arranged at the joint of the rear pump body and the front sealing cap.