Internal gear pump

Abstract

The utility model provides an internal gear pump which comprises a shell assembly, a gear shaft assembly and a gear shaft assembly. The gear set is arranged in the shell assembly; the driving device is arranged in the shell assembly; the rotating shaft is arranged in the shell assembly, a through hole is formed in the rotating shaft in the axial direction of the rotating shaft, and the rotating shaft is connected with the gear set and the driving device to form a rotating shaft assembly; wherein a gap is formed between the rotating shaft assembly and the shell assembly, the gap is communicated with the through hole of the rotating shaft to form a flow channel, and the flow channel is communicated with the inlet and the outlet of the shell assembly. According to the internal gear pump, the flow channel is formed in the gear pump, the heat productivity can be reduced, and the stability of the internal gear pump during working is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear pump technical field, concretely relates to a kind of internal meshing gear pump. BACKGROUND

[0002] Internal meshing gear pump is a kind of volumetric pump widely used in fluid delivery system, the existing internal meshing gear pump because of its structural characteristics, sliding interface is larger, there is more friction between rotating parts and other parts when working, heat is very obvious, can reduce the service life of gear pump;In addition, when rotating, the rotating parts are offset by the influence of radial force, on the one hand, increase the meshing gap, lead to volumetric efficiency to drop significantly, on the other hand, lead to wear aggravation, further reduce the service life of gear pump, reduce the stability of gear pump work. SUMMARY

[0003] In order to overcome the defects in the prior art, the utility model embodiment provides a kind of internal meshing gear pump, can reduce heat quantity, improve heat dissipation efficiency, improve the reliability of internal meshing gear pump.

[0004] To achieve the above object, the utility model adopts the technical scheme that:

[0005] The utility model discloses a kind of internal meshing gear pump, comprising:

[0006] Shell assembly, the shell assembly has import and export;

[0007] Gear set, the gear set is located in the shell assembly;

[0008] Driving device, the driving device is located in the shell assembly;

[0009] Shaft, the shaft is located in the shell assembly, the shaft is provided with through hole along its axial direction, the shaft is connected with the gear set and the driving device respectively to form shaft assembly;

[0010] Wherein, the gap is formed between the shaft assembly and the shell assembly, the gap is communicated with the through hole of the shaft to form flow channel, the flow channel is communicated with the import and export of the shell assembly.

[0011] The above technical scheme is by being set in the circulation flow channel of the shell assembly import and export in shell assembly interior, introduce the fluid inhaled by gear pump, neither add additional components in gear pump, again, can be reduced by the heat generated by the rotation of shaft and the friction between other components by fluid circulation in shell assembly interior, simple structure, can guarantee the overall performance of gear pump, can improve the service life of gear pump.

[0012] Further, the shell assembly comprises a first body, a second body, an outer shell and a cover plate, the first body and the second body are respectively arranged at two ends of the shell assembly, the outer shell is connected to the first body and the second body, the cover plate is located on a side of the second body away from the first body, the first body, the second body and the outer shell jointly enclose a first inner cavity, and the second body and the cover plate jointly enclose a second inner cavity.

[0013] By arranging the shell assembly as the first body for sucking and extruding fluid and the second body for providing power to the sucked and extruded fluid, the internal space of the gear pump can be reasonably arranged.

[0014] Further, the gear set is located in the first inner cavity, and the driving device is located in the second inner cavity. The internal meshing gear pump drives the gear set to rotate through the driving device, so as to suck and extrude fluid.

[0015] Further, the inlet and the outlet of the shell assembly are arranged on the first body.

[0016] Further, the first body is further provided with a high-pressure cavity and a low-pressure cavity, the high-pressure cavity is communicated with the inlet and the gear set of the shell assembly, and the low-pressure cavity is communicated with the outlet and the gear set of the shell assembly. Arranging the inlet and the high-pressure cavity on the first body and arranging the outlet and the low-pressure cavity on the first body can simplify the structural design of the internal meshing gear pump.

[0017] Further, the first bearing is arranged in the first body, the second bearing is arranged in the second body, and the rotating shaft is arranged in the first bearing and the second bearing.

[0018] Further, there is a gap between the first bearing and the first body and between the second bearing and the second body. When the fluid in the flow channel flows through the first bearing and the second bearing, the heat generated by the rotation of the rotating shaft can be reduced, the bearing can be lubricated, and the service life of the bearing can be improved. At the same time, when the fluid flows through the first body and the first bearing and the second body and the second bearing, the fluid generates dynamic pressure due to flow, thereby generating pressure on the rotating shaft, so that the rotating shaft can be close to the center of the bearing, the stability of the rotation of the rotating shaft is improved, and the working stability of the gear pump is improved.

[0019] Further, the diameter of the gap is 0.01-0.2mm. When the gap between the components is too large, the flow rate of the fluid flowing through the gap is large, which leads to instability of the gear pump as a whole. When the gap between the components is too small, the resistance of the fluid flowing through the gap is large, which leads to unsmooth flow of the fluid.

[0020] Further, the through hole of the rotating shaft has a diameter of 0.5-5 mm. If the diameter of the through hole of the rotating shaft is too small, the fluid flowing through the through hole is blocked, and if the diameter of the through hole of the rotating shaft is too large, the performance of the rotating shaft is affected. When the diameter of the through hole is 0.5-5 mm, the fluid can flow smoothly, and the working performance of the rotating shaft is not reduced.

[0021] Further, the gear set comprises an inner gear and an outer gear, the inner gear is arranged eccentrically with the outer gear and is engaged with the outer gear, and the rotating shaft is arranged in the inner gear. The driving device drives the rotating shaft to rotate and then drives the inner gear to rotate, and drives the outer gear to rotate in the same direction. At the inlet, the inner gear and the outer gear are separated from each other to form negative pressure to suck the fluid, and at the outlet, the inner gear and the outer gear are continuously engaged to extrude and output the fluid.

[0022] Compared with the prior art, the utility model has the following advantages due to the use of the above technical scheme:

[0023] 1. The application introduces the fluid sucked by the gear pump by opening the circulating flow channel in the shell assembly, which communicates the inlet and the outlet of the shell assembly. The application does not increase additional components in the gear pump, and the fluid can circulate in the shell assembly to reduce the heat generated by the friction between the rotating shaft and other components. The structure is simple, and the overall performance of the gear pump can be guaranteed, and the service life of the gear pump can be improved.

[0024] 2. The fluid in the flow channel can reduce the heat generated by the rotation of the rotating shaft and lubricate the first bearing and the second bearing to improve the service life of the bearings. When the fluid flows between the first body and the first bearing and between the second body and the second bearing, the fluid generates dynamic pressure due to the flow, thereby generating pressure on the rotating shaft, so that the rotating shaft can be close to the center of the bearing, the stability of the rotation of the rotating shaft is improved, and the working stability of the gear pump is improved.

[0025] In order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0027] Fig. 1 It is a sectional view of the inner engagement gear pump provided by the utility model embodiment;

[0028] Fig. 2 is a structural diagram of an internal gear pump provided by the embodiment of the utility model;

[0029] Fig. 3 is a flow channel flow schematic diagram of an internal gear pump provided by the embodiment of the utility model.

[0030] The above figure reference signs: 1, shell assembly;101, import;102, export;2, internal gear;3, external gear;4, driving device;5, rotating shaft;6, first body;7, second body;8, shell;9, cover plate;10, first bearing;11, second bearing;12, high pressure cavity;13, low pressure cavity. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. In addition, the drawings of the utility model are only simple schematic illustrations, not the depiction of actual dimensions, and the prior declaration is made.

[0032] In the utility model, it needs to be explained that the directions or position relations indicated by the terms "upper", "lower", "internal", "external", "forward", "backward", "between", "close to", "far away" and the like are the directions or position relations based on the directions or position relations shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated having to have a specific direction, being constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model. It also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be directly connected, or indirectly connected. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] It should be understood that although the terms "first", "second", "third" and the like may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items, as appropriate.

[0034] Reference Figs. 1-3This application provides an internal gear pump, comprising: a housing assembly 1 having an inlet 101 and an outlet 102; a gear set and a drive device 4 disposed within the housing assembly 1, the drive device 4 being located on the side of the gear set opposite to the inlet 101 and outlet 102; and a rotating shaft 5 disposed inside the housing assembly 1, the rotating shaft 5 having a through hole along its axial direction, the rotating shaft 5 being connected to the gear set and the drive device 4 respectively to form a rotating shaft assembly, the drive device 4 being used to drive the rotating shaft 5 to rotate, and in one possible embodiment, the drive device 4 being a permanent magnet. A gap is formed between the rotating shaft assembly and the housing assembly 1, the gap communicating with the through hole of the rotating shaft 5 to form a flow channel, the flow channel communicating with the inlet 101 and outlet 102 of the housing assembly 1.

[0035] With the above structure, this embodiment of the application introduces fluid drawn in by the gear pump by opening a circulation channel inside the housing assembly 1 that connects the inlet 101 and the outlet 102 of the housing assembly 1. The fluid circulates inside the housing assembly 1, thereby reducing the heat generated by the friction between the rotating shaft 5 and other components, and improving the service life of the gear pump.

[0036] Specifically, such as Fig. 1 and Fig. 2 As shown, the housing assembly 1 includes a first body 6, a second body 7, a shell 8, and a cover plate 9. The first body 6 and the second body 7 are respectively disposed at both ends of the housing assembly 1. The shell 8 is connected to the first body 6 and the second body 7, so that the first body 6, the second body 7, and the shell 8 together enclose a first inner cavity. The cover plate 9 is located on the side of the second body 7 opposite to the first body 6 and is connected to the second body 7, so that the second body 7 and the cover plate 9 enclose a second inner cavity. The gear set is located in the first inner cavity, and the drive device 4 is located in the second inner cavity.

[0037] The gear set includes an internal gear 2 and an external gear 3. The internal gear 2 and the external gear 3 are eccentrically arranged and mesh with each other. The rotating shaft 5 passes through the internal gear 2, so that when the rotating shaft 5 rotates, it drives the internal gear 2 to rotate, and then drives the external gear 3 to rotate in the same direction.

[0038] In the embodiments of this application, inlet 101 and outlet 102 are spaced apart on the first body 6. The first body 6 is also provided with a high-pressure chamber 12 and a low-pressure chamber 13. The high-pressure chamber 12 is connected to the inlet 101 of the housing assembly 1 and the gear set. The low-pressure chamber 13 is connected to the outlet 102 of the housing assembly 1 and the gear set. Thus, when the internal gear 2 and the external gear 3 work to adsorb fluid, the fluid enters the high-pressure chamber 12 through the inlet 101. When the internal gear 2 and the external gear 3 continuously engage and squeeze the fluid out, the fluid flows out of the outlet 102 from the low-pressure chamber 13.

[0039] Optionally, according to different requirements, the inlet 101 and the high-pressure cavity 12 can be arranged on the second body 7, while the outlet 102 and the low-pressure cavity 13 can be arranged on the second body 7, or the inlet 101 and the high-pressure cavity 12 are arranged on the first body 6, while the outlet 102 and the low-pressure cavity 13 are arranged on the second body 7, or the inlet 101 and the high-pressure cavity 12 are arranged on the second body 7, while the outlet 102 and the low-pressure cavity 13 are arranged on the first body 6, to meet different needs of users.

[0040] In a possible embodiment, the gear pump further comprises a first bearing 10 and a second bearing 11, the first bearing 10 is arranged in the first body 6, and the second bearing 11 is arranged in the second body 7, and the rotating shaft 5 passes through the first bearing 10 and the second bearing 11. The first bearing 10 and the first body 6 have a gap therebetween, and the second bearing 11 and the second body 7 have a gap therebetween, so that the fluid can pass through, on the one hand, the heat generated by the rotation of the rotating shaft 5 can be reduced, and the bearing can be lubricated by the fluid, on the other hand, when the fluid flows through the gap between the first body 6 and the first bearing 10 and the gap between the second body 7 and the second bearing 11, the fluid generates dynamic pressure due to the flow, thereby generating pressure on the rotating shaft 5, so that the rotating shaft 5 can be close to the center of the bearing, and the stability of the rotation of the rotating shaft 5 is improved, and the working stability of the gear pump is improved.

[0041] Preferably, the diameter of the through hole of the rotating shaft 5 is 0.5-5 mm, and the diameter of the gap is 0.01-0.2 mm, so as to avoid that the fluid is blocked when flowing through the gap or the through hole, or the too large flow of the fluid causes the gear pump to be unstable.

[0042] The flow diagram of the fluid in the flow channel in the embodiment of the application is shown in Fig. 3 When the gear pump works, the driving device 4 drives the rotating shaft 5 to rotate and further drives the inner gear 2 to rotate, and drives the outer gear 3 to rotate in the same direction. At the inlet 101, the inner gear 2 and the outer gear 3 are separated from each other to form negative pressure to suck the fluid, the fluid flows through the high-pressure cavity 12, enters the first body 6 and the gear set, flows through the gap between the gear set and the first body 6 to the gap between the gear set and the shell 8, and then flows through the gap between the gear set and the second body 7, flows through the gap between the rotating shaft 5 and the second body 7, enters the gap between the driving device 4 and the second body 7, and then enters the through hole of the rotating shaft 5 through the gap between the driving device 4 and the cover plate 9. When the fluid flows out of the through hole of the rotating shaft 5, it flows through the gap between the rotating shaft 5 and the first body 6 and the gap between the first body 6 and the gear set to the low-pressure cavity 13. At the outlet 102, the inner gear 2 and the outer gear 3 are continuously embedded and engaged to extrude the fluid, so as to realize the circulation flow in the gear pump.

[0043] The principle and implementation mode of the present application are described by using specific examples, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, the specific implementation mode and application range will be changed according to the idea of the present application, and the above description should not be understood as a limitation on the present application.

Claims

1. An internal gear pump characterized by, The utility model relates to a kind of gear pump, including: A housing assembly has an inlet and an outlet; A gear set is provided in the housing assembly; A drive device is provided in the housing assembly; A rotating shaft is provided in the housing assembly, the rotating shaft has a through hole along its axial direction, and the rotating shaft is connected with the gear set and the drive device to form a rotating shaft assembly. The rotating shaft assembly and the housing assembly form a gap, the gap communicates with the through hole of the rotating shaft to form a flow channel, and the flow channel communicates with the inlet and the outlet of the housing assembly.

2. An internal gear pump according to claim 1, wherein The housing assembly includes a first body, a second body, an outer shell and a cover plate, the first body and the second body are respectively arranged at two ends of the housing assembly, the outer shell is connected to the first body and the second body, and the cover plate is located on the side of the second body away from the first body. The first body, the second body and the outer shell jointly enclose to form a first inner cavity, and the second body and the cover plate enclose to form a second inner cavity.

3. An internal gear pump according to claim 2, wherein The gear set is located in the first inner cavity, and the drive device is located in the second inner cavity.

4. An internal gear pump according to claim 2, wherein The inlet and the outlet of the housing assembly are both arranged on the first body.

5. An internal gear pump according to claim 4, wherein The first body is further provided with a high-pressure cavity and a low-pressure cavity, the high-pressure cavity communicates with the inlet and the gear set of the housing assembly, and the low-pressure cavity communicates with the outlet and the gear set of the housing assembly.

6. An internal gear pump according to claim 2, wherein Further comprising a first bearing and a second bearing, the first bearing is arranged in the first body, the second bearing is arranged in the second body, and the rotating shaft is arranged in the first bearing and the second bearing.

7. An internal gear pump according to claim 6, wherein The first bearing and the first body have a gap, and the second bearing and the second body have a gap.

8. An internal gear pump according to claim 1, wherein The diameter of the gap is 0.01-0.2mm.

9. An internal gear pump as set forth in claim 1, wherein, The diameter of the through hole of the rotating shaft is 0.5-5mm.

10. An internal gear pump according to claim 1, wherein The gear set includes an inner gear and an outer gear, the inner gear and the outer gear are eccentrically arranged and meshed with each other, and the rotating shaft is arranged in the inner gear.

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