TWI550191B - Half-type internal gear pump - Google Patents

Description

Half moon type internal gear pump

The invention relates to internal gear pumps, in particular to a half moon internal gear pump.

The internal gear pump has the advantages of no oil accumulation, stable transportation, high efficiency, low noise and long service life. It is widely used in the transportation of petroleum, chemical, paint, dye, food, grease, medicine and other industries. The type of liquid to be transported can range from light, volatile liquids to heavy, viscous or even semi-solid, highly viscous liquids with a viscosity range from 0.2 to 1,000,000 cp.

The existing internal gear pump uses the movable crescent plate to separate the high and low pressure chambers, and the pressure compensation is formed in the radial direction, so that the gap between the crests of the inner and outer teeth and the crescent plate forms a seal with no gap, and the axial dynamic compensating disc ensures the shaft. The tightness to the gap causes the internal leakage of the internal gear pump to minimize the state. Although the internal gear pump of this structure has a good sealing effect, the state of internal leakage cannot be avoided.

Although the existing improved structure has a good sealing effect, the elastic peripheral wall is not wear-resistant and has a short service life, thereby affecting the life of the entire internal gear pump. In addition, there is also a problem of floating resonance, and the stability is relatively poor. Therefore, it is necessary to improve the existing product structure.

The object of the present invention is to provide an internal gear pump with good pressure retention, flexible combination, simple manufacture, stability and reliability, and long service life.

In order to achieve the foregoing object, a half-moon internal gear pump according to the present invention includes a ring gear for internal engagement, a pinion gear that meshes with a tooth portion of the ring gear, and a ring gear and a pinion gear. The pump body has an oil inlet port and an oil outlet port, and the ring gear forms a gradually narrowing annular space with the tooth tip round portion of the pinion gear. a gap-filling component comprising a gap-filling positive film and a gap-filling positive film, the gap-filling positive film being stacked over the interstitial sub-sheet, and a round bar between the interstitial positive film and the interstitial sub-sheet And shrapnel. The gap-filling positive film and the two sides of the gap-filling sub-sheet are provided with a groove, and the groove is inserted with a slider, and the interstitial positive film and the interstitial sub-sheet can be stretched to make the sealing property and the pressure holding effect more it is good. The gap filler assembly is a two-piece eccentric design that enhances radial pressure compensation.

Wherein the interstitial positive film is provided with at least one groove for allowing liquid to flow through the interstitial positive film and the interstitial sub-sheet to support each other to produce a sealing pressure-preserving effect. A shrapnel is arranged in the groove.

Wherein the interstitial sub-sheet is provided with a groove corresponding to the interstitial positive groove, and a round bar and a spring piece are disposed in the groove of the interstitial positive film and the groove of the interstitial sub-sheet.

The oil inlet and the oil outlet of the pump body are set at ninety degrees.

The oil inlet and the oil outlet of the pump body are arranged in a straight line.

1‧‧‧ front cover

2‧‧‧ Front cover

11‧‧‧ Back cover

12‧‧‧Back cover

13‧‧‧ Pressure plate

14‧‧‧ oil seal

15‧‧‧First seal

151‧‧‧Second seal

16‧‧‧ bushing

18‧‧‧First seal

19‧‧‧Second seal

21‧‧‧ pinion

22‧‧‧ bolt

3‧‧‧ pump body

4‧‧‧ ring gear

5‧‧‧filling components

51‧‧‧Interstitial film

511, 512‧‧ ‧ grooves

52‧‧‧Interstitial film

521‧‧ ‧ Groove

53‧‧‧ Groove

6‧‧‧Shrap

7‧‧‧ round stick

9‧‧‧ Slider

91‧‧‧ cylindrical end

92‧‧‧ plate end

10‧‧‧Axle

The first figure is a cross-sectional view of a first embodiment of the present invention.

The second figure is a left side view of the first embodiment of the present invention.

The third figure is a cross-sectional view of a second embodiment of the present invention.

The fourth figure is a left side view of the second embodiment of the present invention.

Figure 5 is a perspective view of the gap filler assembly of the present invention.

Figure 6 is a front elevational view of the gap filler assembly of the present invention.

The seventh figure is a perspective view of the gap filler component insertion slider in the present invention.

The eighth figure is a front view of the gap filler assembly insertion slider of the present invention.

Figure 9 is a perspective view of the slider of the present invention.

The tenth figure is an exploded view of the second embodiment of the present invention.

Figure 11 is an exploded view of the first embodiment of the present invention.

In order to explain in detail the technical features of the present invention, the following preferred implementations are presented. And the following description, with reference to the drawings, wherein: as shown in the first, second and eleventh figures, the half-moon internal gear pump of the present invention comprises a ring gear 4 for internal engagement, and a tooth A partial gear 21 of the ring 4 engages with a pinion 21, a pump body 3 for mounting the ring gear 4 and the pinion 21. The ring gear 4 and the crest portion of the pinion gear 21 form an annular space which is tapered at both ends, and the gap filler assembly 5 is disposed in the annular space. As shown in the fifth to ninth drawings, the gap-filling assembly 5 includes a gap-filling positive film 51 and a gap-filling positive film 52. The gap-filling positive film 51 is superposed on the interstitial sub-sheet 52. The interstitial positive film 51 A groove 511, 521 is respectively disposed corresponding to the interstitial sub-sheet 52, and a round bar 7 and at least one elastic piece are disposed between the groove 511 of the interstitial positive film 51 and the groove 521 of the interstitial sub-sheet 52. 6. The interstitial positive film is further provided with another concave groove 512, and another elastic piece 6' is disposed in the other concave groove 512. A groove 53 is defined in each of the two sides of the interstitial positive film 51 and the interstitial sub-sheet 52. Each of the grooves 53 is provided with a slider 9 having a cylindrical end 91 and a plate-like end 92. The sliders 9 are respectively inserted into the corresponding recesses 53 at their plate-like ends 92. The interstitial positive film 51 and the interstitial sub-sheet 52 can be relatively separated for the stretching action, so that the sealing property is better and the pressure holding effect is improved. The gap-filling component is a two-piece eccentric design that effectively enhances the radial compensation effect. The pinion 21 is fixed to the axle 10 and is disposed in the pump body 3 through the axle 10. The pump body 3 is provided with an oil inlet port A and an oil outlet port B, and the oil inlet port A and the oil outlet port B are at an angle of 90 degrees. The pinion gear 21 is eccentrically disposed with respect to the ring gear 4, and the pinion gear 21 meshes with the phase tooth portions that are dependent in the ring gear 4. A ring-shaped narrowing annular space is formed between the ring gear 4 and the crest portion of the pinion gear 21, and the pump chamber is provided with the gap filler assembly 5 corresponding to the peripheral contour of one side of the pump chamber. . The half moon type internal gear pump further includes a front middle cover 2 and a front cover 1 installed at the front end of the pump body 3. A pressure plate 13 and a first sealing ring 15 are disposed between the pump body 3 and the front middle cover 2. Two corresponding shapes of the first gasket 18 and two second gaskets 19. The rear end of the pump body 3 includes a rear middle cover 12 and a rear cover 11. An oil seal 14, a second seal ring 151 and a bushing 16 are disposed between the front middle cover 2 and the front cover 1. The rear cover 11, the rear middle cover 13, the pump body 3, the front middle cover 2, and the front cover 1 are locked and fixed by four bolts 22.

The third embodiment, the fourth figure and the tenth figure show a second embodiment of the present invention. The basic structure of the present embodiment is the same as that of the previous embodiment, except that there is no rear cover 12 in this embodiment. The rear cover 11 is directly connected to the pump body 3.

The invention is described with reference to the specific embodiments but is not limited thereto.

1‧‧‧ front cover

2‧‧‧ Front cover

3‧‧‧ pump body

4‧‧‧ ring gear

5‧‧‧filling components

6‧‧‧Shrap

7‧‧‧ round stick

9‧‧‧ Slider

10‧‧‧Axle

11‧‧‧ Back cover

12‧‧‧Back cover

13‧‧‧ Pressure plate

Claims (3)

A half-moon internal gear pump includes: a ring gear for internal engagement, a pinion gear meshing with the ring gear portion, a pump body for mounting the ring gear and the pinion gear, the ring gear and A tapered annular space is formed between the crests of the pinion, and a gap-filling component is disposed in the annular space, the pump body has an oil inlet and an oil outlet; and the gap filler component The gap-filling positive film is disposed on the interstitial sub-sheet, and the interstitial positive film is provided with a groove, and the interstitial sub-sheet is provided with a groove corresponding to the eccentricity. a groove of the positive film, a round bar and a spring piece are disposed between the groove of the gap-filling positive piece and the groove of the gap-filling piece, and the gap-filling positive piece and the two sides of the gap-filling piece are respectively provided with a concave groove a slot is inserted into each of the grooves; wherein the slider has a plate-shaped end that is respectively inserted into a corresponding groove; the gap-filled positive piece is further provided with another groove, and the other Another shrapnel is provided in one of the grooves. The half-moon type internal gear pump according to the first aspect of the patent application, wherein the oil inlet port and the oil outlet port are at an angle of 90 degrees. The half-moon internal gear pump according to claim 1 or 2, wherein the oil inlet is in line with the oil outlet.