CN212615341U - Inner gearing cycloid gear pump - Google Patents

Abstract

The utility model discloses an inner gearing cycloid gear pump, including pump case, pump cover and annular sealing member, the pump cover includes 6 at least connecting portion, and each connecting portion pass through the fastener and connect the pump case along a reference circle equipartition in the side of pump cover, connecting portion, and the sealing member is pressed and is located between pump case and the pump cover. The utility model discloses in set up connecting portion into 6 at least to set up connecting portion into the circumference of equipartition at the pump cover, make the central angle that the sealing member between two adjacent junctions corresponds be less than or equal to 60, thereby make the effort that comes from pump cover and pump case that the sealing member bore more even, and sealed weak part must be strengthened, and then has promoted the leakproofness between pump cover and the pump case, has solved the oil leakage problem.

Description

Inner gearing cycloid gear pump

Technical Field

The utility model relates to a gear pump technical field especially relates to an inner gearing cycloid gear pump with sealed effect of preferred.

Background

In the inner gearing cycloid gear pump, the pump cover covers the opening part of the pump case, 3 connecting positions are arranged between the pump cover and the pump case, and a sealing piece is arranged between the pump cover and the pump case to seal the pump cover and the pump case.

When the pressure of the medium in the liquid path floats or the medium runs at a higher pressure, higher requirements are put on the sealing performance between the pump cover and the shell, and the oil leakage phenomenon still exists in the prior art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is in order to overcome the above-mentioned defect among the prior art, and provide an inner gearing cycloid gear pump with higher leakproofness.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

an inner meshing cycloid gear pump comprises a pump shell, a pump cover and an annular sealing piece, wherein the sealing piece is pressed between the pump shell and the pump cover; the pump cover is characterized by comprising at least 6 connecting parts, wherein the connecting parts are uniformly distributed on the side surface of the pump cover along a reference circle, and the connecting parts are connected with the pump shell through fasteners.

Preferably, the connecting portion is provided with a through hole, the pump shell is provided with threaded holes corresponding to the through holes one to one, the fastener penetrates through the through hole and is in threaded connection with the threaded holes, and the top of the fastener and the pump cover are mutually limited.

Preferably, the side surface of the connecting part comprises a first cylindrical surface, and the corresponding axis of the first cylindrical surface is coincident with the axis of the through hole of the connecting part.

Preferably, the pump cover further comprises a disc body, the connecting portion is fixedly connected to the circumferential direction of the disc body, and the first cylindrical surface and the side surface of the disc body are in smooth transition through a fillet.

Preferably, the center of the reference circle is located on the axis of the disc body.

Preferably, a seal groove with an opening on one surface is formed on the pump casing or the pump cover, and the seal is pressed in the seal groove.

Preferably, the sealing element is a sealing ring, and the compression amount of the wire diameter of the sealing ring is 15% -30%.

Preferably, the pump casing comprises mounting parts corresponding to the connecting parts one by one, and the side surfaces of the mounting parts and the side surfaces of the connecting parts corresponding to the mounting parts are positioned in the same curved surface; and/or the presence of a gas in the gas,

the number of the connecting parts is 6.

Preferably, the gear pump further comprises:

the driving shaft is inserted into one end, far away from the pump cover, of the pump shell;

the driving gear is fixedly connected to the driving shaft and is positioned in the pump shell;

the driven gear is eccentrically arranged with the driving gear and forms an inner meshing position with the driving gear; and the number of the first and second groups,

and the gear ring is arranged in the pump shell and used for restraining the position of the driven gear.

Preferably, the gear pump is used for an oil supply lubrication system of a refrigeration compressor.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses in, set up connecting portion into 6 at least to set up connecting portion into the circumference of equipartition at the pump cover, make the central angle that the sealing member between two adjacent junctions corresponds be less than or equal to 60, thereby make the effort that comes from pump cover and pump case that the sealing member bore more even, and sealed weak part gets strengthened, and then has promoted the leakproofness between pump cover and the pump case, has solved the oil leakage problem.

Drawings

Fig. 1 is a front view of a gear pump according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a perspective view of a gear pump according to an embodiment of the present invention.

Description of reference numerals:

pump housing 1

Accommodating cavity 11

Opening 12

Mounting portion 13

Screw hole 131

Sealing groove 132

Second cylindrical surface 133

Pump cover 2

Connecting part 21

Through-hole 211

First cylindrical surface 212

Tray body 22

Sealing element 3

Reference circle 4

Fastener 5

Drive shaft 6

Drive gear 7

Driven gear 8

Gear ring 9

Detailed Description

The present invention is further illustrated by the following examples, but is not intended to be limited thereby within the scope of the following examples.

Referring to fig. 1-2, an embodiment of the present invention provides an internal meshing cycloid gear pump, which is mainly applied to a small flow refrigeration compressor oil supply lubrication system.

The gear pump includes pump case 1, pump cover 2 and annular sealing member 3, and pump cover 2 includes 6 at least connecting portion 21, and each connecting portion 21 is followed 4 equipartitions of a reference circle in the side of pump cover 2, and connecting portion 21 passes through fastener 5 and connects pump case 1, and sealing member 3 is pressed and is located between pump case 1 and the pump cover 2.

The pump casing 1 is a shell of the gear pump, the middle part of the pump casing 1 is provided with an accommodating cavity 11, and the accommodating cavity 11 comprises an oil suction area (not shown in the figure) and an oil pressing area (not shown in the figure); the housing is provided with an oil inlet (not shown) and an oil outlet (not shown) for communicating the accommodating cavity 11 with the outside, wherein the oil inlet corresponds to the oil absorption area, and the oil outlet corresponds to the oil pressing area. The pump housing 1 also has an opening 12, at which opening 12 the pump cap 2 covers the pump housing 1.

The connecting portions 21 are uniformly distributed in the circumferential direction of the pump cover 2, and the connecting portions 21 are located on the end surface of the pump cover 2, and in this embodiment, 6 connecting portions 21 are taken as an example for description, but in other embodiments, as an alternative means, the number of the connecting portions 21 may be 7, 8, 9, or 10. It is preferable that the larger the overall size of the gear pump is, the larger the number of the connecting portions 21 is.

The number and position of the connecting portions 21 are the number and position of the joints formed by the pump covers 2 and the pump housings 1. Compare I, when adopting 3 junctions to connect between pump cover and the pump case among the prior art, the central angle that the sealing member between two junctions corresponds is 120, then is close to the intermediate position of two adjacent junctions more, and the sealing action of sealing member to pump case and pump cover is more weak, appears the oil leak phenomenon easily. And in this embodiment, set up connecting portion 21 to 6 at least to set up connecting portion 21 to the circumference of equipartition at pump cover 2, make the central angle that sealing member 3 between two adjacent junctions corresponds be less than or equal to 60, in other words, the utility model discloses the effort that comes from pump cover 2 and pump case 1 that well sealing member 3 bore is more even, and sealed weak part is strengthened, thereby has promoted the leakproofness between pump cover 2 and the pump case 1, has solved the oil leak problem.

Referring to fig. 2, the connecting portion 21 is provided with through holes 211, the pump case 1 is provided with threaded holes 131 corresponding to the through holes 211 one by one, the fastening member 5 penetrates through the through holes 211 and is in threaded connection with the threaded holes 131, and the top of the fastening member 5 and the pump cover 2 are limited mutually.

Preferably, each connecting portion 21 is provided with a through hole 211, each through hole 211 is a smooth hole, each threaded hole 131 is a blind hole, each fastener 5 is a bolt or a screw, and the head of the bolt or the head of the screw is mutually limited with the pump cover 2.

Referring to fig. 3, the side surface of the connecting portion 21 includes a first cylindrical surface 212, and an axis corresponding to the first cylindrical surface 212 coincides with an axis of the through hole 211 of the connecting portion 21, so that the acting force applied to the portion between the first cylindrical surface 212 and the through hole 211 is uniform.

Referring to fig. 3, the pump cap 2 further includes a disc 22, the connecting portion 21 is fixed to the circumferential direction of the disc 22, and the first cylindrical surface 212 and the lateral surface of the disc 22 are smoothly transited through a rounded corner. Wherein, through setting up the side of first cylinder 212 and disk 22 and passing through the smooth transition of radius angle, reduced the stress concentration of first cylinder 212 and disk 22 junction.

Preferably, the tray 22 is disk-shaped. It is further preferable that the center of the reference circle 4 is located on the axis of the disc body 22, so that the pump cover 2 is uniformly stressed, and stress concentration is avoided. The reference circle 4 is shown in dashed lines in fig. 1.

It is further preferable that the tray body 22 and each of the connection portions 21 are integrally formed. The thickness of the tray body 22 and the connecting portion 21 are the same in this embodiment, but it is true that in other embodiments, the tray body 22 and the connecting portion 21 may have different thicknesses as an alternative.

As will be further understood from fig. 2, the pump housing 1 or the pump cover 2 is provided with a sealing groove 132 having an opening 12 on one side, the sealing member 3 is pressed in the sealing groove 132, and the sealing between the pump housing 1 and the pump cover 2 is achieved by compressing the sealing member 3. Fig. 2 illustrates the sealing groove 132 disposed on the pump housing 1 with the opening 12 facing the pump cover 2, but in other embodiments, the sealing groove 132 may be disposed on the pump cover 2 with the opening 12 facing the pump housing 1 as an alternative.

The sealing element 3 is preferably a sealing ring, the compression rate of the wire diameter of the sealing ring is 15% -30%, and a larger wire diameter is selected under the condition that the compression rate of the sealing ring is not changed, so that a better sealing effect can be further obtained.

As will be further understood by referring to fig. 2 to 3, the pump casing 1 includes the mounting portions 13 corresponding to the connecting portions 21 one by one, the side surfaces of the mounting portions 13 and the side surfaces of the connecting portions 21 corresponding thereto are located in the same curved surface, in other words, the side surfaces of the mounting portions 13 and the side surfaces of the connecting portions 21 have the same shape, the side surfaces of the mounting portions 13 include the second cylindrical surfaces 133, and the second cylindrical surfaces 133 and other portions of the pump casing 1 are in smooth transition through rounding. This embodiment is located the coplanar through the side that sets up installation department 13 and the side of connecting portion 21, makes the atress of connecting portion 21 and installation department 13 comparatively even on the one hand, and on the other hand is convenient for promote the aesthetic property of gear pump.

As will be further understood in conjunction with fig. 2, the gear pump also includes a drive shaft 6, a drive gear 7, a driven gear 8, and a ring gear 9. The driving shaft 6 is inserted into one end of the pump shell 1 far away from the pump cover 2 and is used for transmitting external torque to the driving gear 7. The driving gear 7 is fixedly connected with the driving shaft 6, and preferably, the driving gear and the driving shaft are in key connection; the driving gear 7 is located in the pump housing 1 and serves as a driving gear. The driven gear 8 is a gear with internal teeth, and the driving gear 7 is positioned inside the driven gear 8 in a spatial position; the driven gear 8 and the driving gear 7 are eccentrically arranged and form an inner meshing position with the driving gear 7; the driving gear 7 drives the driven gear 8 to rotate through the position of the internal meshing; the driving gear 7 and the driven gear 8 form the oil suction area with lower pressure and the oil pressing area with higher pressure. A ring gear 9 is arranged in the pump housing 1, the ring gear 9 having an inner ring, the ring gear 9 serving to confine the driven gear 8 in the inner ring, in other words, the driven gear 8 rotates in the ring gear 9 during operation.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are within the scope of the present invention.

Claims (10)

1. An inner meshing cycloid gear pump comprises a pump shell, a pump cover and an annular sealing piece, wherein the sealing piece is pressed between the pump shell and the pump cover; the pump cover is characterized by comprising at least 6 connecting parts, wherein the connecting parts are uniformly distributed on the side surface of the pump cover along a reference circle, and the connecting parts are connected with the pump shell through fasteners.

2. The gear pump of claim 1, wherein the connecting portion is provided with through holes, the pump housing is provided with threaded holes corresponding to the through holes one to one, the fastening member penetrates through the through holes and is in threaded connection with the threaded holes, and the top of the fastening member and the pump cover are mutually limited.

3. The gear pump of claim 2, wherein the side surface of the connecting portion includes a first cylindrical surface, the first cylindrical surface having a corresponding axis that coincides with the axis of the through-hole of the connecting portion.

4. The gear pump of claim 3, wherein the pump cover further comprises a disc body, the connecting portion is fixedly connected to the circumferential direction of the disc body, and the first cylindrical surface and the side surface of the disc body are smoothly transited through a rounded corner.

5. The gear pump of claim 4 wherein the center of said reference circle is located on the axis of said disc.

6. The gear pump of claim 1, wherein said pump housing or said pump cover is provided with a rectangular seal groove open at one face, said seal being compressed within said seal groove.

7. The gear pump of claim 1, wherein said seal is a seal ring having a wire diameter compression of between 15% and 30%.

8. Gear pump according to any of claims 1 to 7, characterized in that:

the pump shell comprises mounting parts which are in one-to-one correspondence with the connecting parts, and the side surfaces of the mounting parts and the side surfaces of the connecting parts which correspond to the mounting parts are positioned in the same curved surface; and/or the presence of a gas in the gas,

the number of the connecting parts is 6.

9. The gear pump of any one of claims 1-7, further comprising:

the driving shaft is inserted into one end, far away from the pump cover, of the pump shell;

the driving gear is fixedly connected to the driving shaft and is positioned in the pump shell;

the driven gear is eccentrically arranged with the driving gear and forms an inner meshing position with the driving gear; and the number of the first and second groups,

and the gear ring is arranged in the pump shell and used for restraining the position of the driven gear.

10. Gear pump according to any of claims 1 to 7, characterized in that it is used in the oil lubrication system of refrigeration compressors.

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