CN218325261U - Radial clearance compensation structure for small-displacement internal gear pump - Google Patents
Radial clearance compensation structure for small-displacement internal gear pump Download PDFInfo
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- CN218325261U CN218325261U CN202222541458.0U CN202222541458U CN218325261U CN 218325261 U CN218325261 U CN 218325261U CN 202222541458 U CN202222541458 U CN 202222541458U CN 218325261 U CN218325261 U CN 218325261U
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- crescent
- internal gear
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Abstract
The utility model discloses a radial clearance compensation structure for little discharge capacity internal gear pump, which comprises a housin, be equipped with pump oil drain port on the casing and pump the hydraulic fluid port, install intermeshing's ring gear and external gear axle in the casing, install integral crescent block between ring gear and external gear axle, two compensation sliders have been arranged on the centre-to-centre spacing direction along ring gear and external gear axle in the casing. The utility model discloses make the ring gear paste the surface of tight crescent moon piece all the time, make the internal surface of crescent moon piece paste tight external gear axle all the time simultaneously to reach the function of compensation crescent gear pump radial clearance, even if wear and tear appears in the course of the work, also can remain reliable sealed all the time, make the pump keep higher volumetric efficiency always. The utility model discloses can not receive the restriction of internal gearing gear pair inner space, be convenient for process and location.
Description
Technical Field
The utility model relates to a radial clearance compensation structure for little discharge capacity crescent gear pump belongs to gear pump technical field.
Background
Gear pumps are common hydraulic components in hydraulic transmission systems and can be structurally divided into two major categories, namely external gear pumps and internal gear pumps. The internal gear pump is widely used due to its outstanding advantages of small flow and pressure pulsation, high volumetric efficiency, low noise level, etc.
To crescent gear pump's radial clearance compensation problem, generally adopt among the prior art scheme to place big or small crescent block subassembly in the crescent gear pair of pump, mainly include big crescent block, little crescent block, spring leaf, nylon stick, locating pin etc. its effect is on the one hand to compensate the radial clearance of crescent gear pump, still plays the sealed effect of keeping apart high-low pressure oil zone simultaneously.
Above-mentioned big or small crescent block subassembly structure is comparatively complicated, to some little discharge capacity crescent gear pumps that are applied to special occasion, because the inner space of its internal gear pair is extremely limited, there is great degree of difficulty in processing big or small crescent block subassembly, and intensity and rigidity also are difficult for reaching the performance requirement. Therefore, the existing small-displacement internal gear pump has the defects of high difficulty and high cost in radial clearance compensation by adopting the large and small crescent block assemblies.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a radial clearance compensation structure for little discharge capacity crescent gear pump.
In order to realize the above-mentioned purpose, the utility model discloses a radial clearance compensation structure for little discharge capacity internal gear pump, which comprises a housin, be equipped with pump oil drain port and pump suction opening on the casing, install intermeshing's ring gear and outer gear shaft in the casing, install integral crescent block between ring gear and outer gear shaft, two compensation slider have been arranged on the centre-to-centre spacing direction along ring gear and outer gear shaft in the casing.
As an improvement, the outer surface of the inner gear ring is in clearance fit with the inner surface of the shell.
As an improvement, the crescent block is provided with an inner arc surface and an outer arc surface which are not concentric, the radius of the arc of the outer arc surface is the same as that of the addendum circle of the inner gear ring, and the radius of the arc of the inner arc surface is the same as that of the addendum circle of the outer gear shaft.
As an improvement, two sides of the crescent block are provided with limit pins.
As an improvement, strip-shaped notches are formed in the radial positions of the two sides of the crescent block, and limiting pins are located in the strip-shaped notches and are fixedly installed on an upper end cover and a lower end cover of the internal gear pump.
As an improvement, the inner side of the shell is provided with two opposite grooves along the direction of the center distance between the inner gear ring and the outer gear shaft, and the compensating slide block is arranged in the grooves.
As an improvement, each groove is connected with an oil passage in the shell through an oil supply channel.
As an improvement, a radial oil through hole is formed in each tooth top of the inner gear ring.
The problem to the unable big or small crescent block piece subassembly structure that utilizes now of little discharge capacity internal gear pump carries out radial clearance compensation, the utility model discloses a radial clearance compensation structure adopts the integral crescent block that can make radial float along with the ring gear to arrange the compensation slider in the casing, do not act on the compensation slider to the high pressure oil content in pump oil discharge district, effective area of action on through the design compensation slider, alright make it produce a reliable packing force to the internal gear ring all the time, under the effect of this power, make the ring gear paste the surface of crescent block all the time, make the internal surface of crescent block paste the outer gear shaft all the time simultaneously, thereby reach the function of compensation internal gear pump radial clearance, even if appear wearing and tearing in the course of the work, also can remain reliable sealed all the time, make the pump keep higher volumetric efficiency all the time. The utility model discloses can not receive the restriction of internal gearing gear pair inner space, be convenient for process and location.
Drawings
FIG. 1 is a schematic view of the present invention;
in the figure: 1. the pump oil pumping device comprises a pump oil discharging port 2, a shell 3, oil supply channels A and 4, compensation sliding blocks A and 5, a limiting pin 6, an inner gear ring and 7, a pump oil pumping port 8, a crescent block 9, an outer gear shaft 10, compensation sliding blocks B and 11 and an oil supply channel B.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
As shown in fig. 1, a radial clearance compensation structure for a small-displacement internal gear pump, which is a positive displacement hydraulic pump, includes a housing 2, the housing 2 is provided with a pump oil discharge port 1 and a pump oil suction port 7, an internal gear ring 6 and an external gear shaft 9 which are engaged with each other are installed in the housing 2, an integral crescent block 8 is installed between the internal gear ring 6 and the external gear shaft 9, and two compensation sliders are arranged in the housing 2 along a direction of a center distance between the internal gear ring 6 and the external gear shaft 9;
through the meshing and reliable axial and radial sealing of the inner gear ring 6 and the outer gear shaft 9, a periodic variable cavity is formed, when the outer gear shaft 9 rotates in the direction shown in figure 1 under the driving of a prime mover, the inner gear ring 6 is driven to rotate in the same direction, therefore, in the inner gear pump with the structure shown in the figure, a gear pair enters a meshing area in the same direction, the volume is reduced, and the gear pair exits the meshing area in the same direction, the volume is increased;
meanwhile, each tooth top of the inner gear ring 6 is provided with a radial oil through hole, so that hydraulic oil can enter an oil suction area through the oil suction port 7 of the pump along with the rotation of the outer gear shaft 9, oil is conveyed to an oil discharge area through an inter-tooth containing cavity formed by the inner surface of the outer gear shaft 9 and the crescent block and the outer surface of the inner gear ring 6 and the crescent block, and the oil enters and is meshed in the same direction based on the gear pair in the area, so that the volume is reduced, and pressure oil is conveyed to a system pipeline through the oil discharge port 1 of the pump.
As an improvement of the embodiment, the crescent block 8 plays a role of isolating high-pressure and low-pressure oil areas of the gear pump, the crescent block 8 is provided with an inner arc surface and an outer arc surface which are not concentric, the arc of the outer arc surface is the same as the radius of the addendum circle of the inner gear ring 6, and the arc of the inner arc surface is the same as the radius of the addendum circle of the outer gear shaft 9, so that the integral crescent block 8 can be embedded in a gear pair of the internal gear pump.
As an improvement of the embodiment, the radial positions of two sides of the crescent block 8 are provided with strip-shaped gaps for installing the limit pin 5, the limit pin 5 is installed and fixed on the upper end cover and the lower end cover of the internal gear pump, and the position of the limit pin 5 is not movable, so that the movement of the crescent block 8 in the circumferential direction is limited; meanwhile, when the crescent block 8 is worn, the limiting pin 5 allows the crescent block 8 to move slightly in the radial direction to compensate for a gap generated after the crescent block is worn. The utility model discloses an integral crescent moon piece only needs to carry out circumference spacing, makes it not remove along the circumferencial direction along with the rotation of gear pair, even if wearing and tearing appear in integral crescent moon piece in the course of the work, also can remain reliable sealed throughout, makes the pump keep higher volumetric efficiency always.
As an improvement of the embodiment, grooves are formed on two inner sides of the housing 2, and a compensation slider A4 and a compensation slider B10 are respectively arranged at positions along the direction of the center distance of the internal gear pair, the compensation slider A4 and the compensation slider B10 can move radially along the direction of the center distance of the gear pair within a certain range, the outer surface of the inner gear ring 6 is in clearance fit with the inner surface of the housing 2, and the inner gear ring 6 is in a floating state. The utility model discloses a design of surplus packing force passes through the casing pore to the high-pressure oil in pump oil discharge district, is used in compensation slider A4 and compensation slider B10 respectively to the shape of the effective area of action of two compensation sliders of rational design makes hydraulic pressure force Fa that compensation slider A4 received and the hydraulic pressure force Fb that compensation slider B10 received, acts on same straight line and opposite direction, 1.05 the number Fa/Fb <1.2 simultaneously. Therefore, the compensation slide block A4 and the compensation slide block B10 always generate a reliable pressing force on the inner gear ring 6, under the action of the force, the inner gear ring 6 is always attached to the outer surface of the crescent block 8, and meanwhile, the inner surface of the crescent block 8 is always attached to the outer gear shaft 9, so that the effect of compensating the radial clearance is achieved.
When the internal gear pump oil-discharging device is used, high-pressure oil in an oil-discharging area of the internal gear pump is led to the bottom of a compensation slide block A4 through an oil-supplying channel A3 and high-pressure oil is led to the bottom of a compensation slide block B10 through an oil-supplying channel B11, and a certain area difference exists between oil action surfaces at the bottoms of the compensation slide block A4 and the compensation slide block B10, so that a pressing force along the central line direction of two gears (an inner gear ring and an outer gear shaft) can be always generated on an internal gear ring 6 under the action of the high-pressure oil in the oil-discharging area through reasonably designing the shape and the area of the oil action areas at the bottoms of the compensation slide block A4 and the compensation slide block B10, the internal gear ring 6 is pressed on a crescent block 8 under the action of the pressing force, and the reliable sealing of a radial gap of the internal gear pump is ensured;
in addition, based on the structural characteristics, the inner gear ring 6 always clings to the outer surface of the crescent block 8, the inner surface of the crescent block 8 always clings to the outer gear shaft 9, and the inner and outer arc surfaces of the crescent block 8 are worn as long as time passes, but through the structure, a pressing force along the direction of the central connecting line of the two gears is always generated on the inner gear ring 6 in the operation process of the internal gear pump, the pressing force can enable the inner gear ring 6 and the crescent block 8 to slightly float along the central distance direction of an internal gear pair so as to compensate a gap generated after the inner and outer arc surfaces of the crescent block 8 are worn, and meanwhile, the relative position of the inner gear ring 6 and the outer gear shaft 9 is kept stable in a new balance state, so that the self-adaptive compensation function of the radial gap of the internal gear pump is achieved, the radial gap of the internal gear pump is always kept reliably sealed in a radial direction, and the pump always keeps higher volumetric efficiency.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (8)
1. The utility model provides a radial clearance compensation structure for small discharge capacity internal gear pump, includes casing (2), be equipped with pump oil drain port (1) and pump suction port (7) on casing (2), install intermeshing's ring gear (6) and external gear axle (9) in casing (2), its characterized in that, install integral crescent piece (8) between ring gear (6) and external gear axle (9), two compensation sliders have been arranged on the centre-to-centre spacing direction of edge ring gear (6) and external gear axle (9) in casing (2).
2. A radial clearance compensating structure for a small displacement internal gear pump according to claim 1, wherein the outer surface of the ring gear (6) is in clearance fit with the inner surface of the housing (2).
3. A radial clearance compensating structure for a small capacity internal gear pump according to claim 1, wherein the crescent block (8) has inner and outer two arc surfaces which are not concentric, the arc of the outer arc surface is the same as the addendum radius of the ring gear (6), and the arc of the inner arc surface is the same as the addendum radius of the external gear shaft (9).
4. A radial clearance compensating structure for a small displacement internal gear pump in accordance with claim 1, wherein a stopper pin (5) is installed at both sides of the crescent block (8).
5. A radial clearance compensation structure for a small displacement internal gear pump according to claim 4, wherein strip-shaped notches are formed at radial positions on two sides of the crescent block (8), and the limit pins (5) are positioned in the strip-shaped notches and are fixedly installed on the upper end cover and the lower end cover of the internal gear pump.
6. A radial clearance compensating structure for a small displacement internal gear pump according to claim 1, wherein the inner side of the housing (2) is opened with two opposite grooves in the direction of the center distance of the ring gear (6) and the external gear shaft (9), and the compensating slide is disposed in the grooves.
7. A radial clearance compensating arrangement for a small capacity crescent gear pump according to claim 6, characterized in that each groove is connected to an oil gallery in the housing (2) via an oil supply passage.
8. A radial clearance compensating structure for a small displacement internal gear pump in accordance with claim 1, wherein a radial oil through hole is opened at each tooth crest of the ring gear (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222541458.0U CN218325261U (en) | 2022-09-26 | 2022-09-26 | Radial clearance compensation structure for small-displacement internal gear pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222541458.0U CN218325261U (en) | 2022-09-26 | 2022-09-26 | Radial clearance compensation structure for small-displacement internal gear pump |
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| CN218325261U true CN218325261U (en) | 2023-01-17 |
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| CN202222541458.0U Active CN218325261U (en) | 2022-09-26 | 2022-09-26 | Radial clearance compensation structure for small-displacement internal gear pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116335937A (en) * | 2023-02-28 | 2023-06-27 | 中国人民解放军海军工程大学 | Coaxial integrated electro-hydraulic pump |
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2022
- 2022-09-26 CN CN202222541458.0U patent/CN218325261U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116335937A (en) * | 2023-02-28 | 2023-06-27 | 中国人民解放军海军工程大学 | Coaxial integrated electro-hydraulic pump |
| CN116335937B (en) * | 2023-02-28 | 2024-03-15 | 中国人民解放军海军工程大学 | Coaxial integrated electro-hydraulic pump |
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