Internal gear pump with filling piece

Abstract

The invention provides an internal gear pump with a filling piece, which comprises a pump body, an inner gear ring and an outer gear internally meshed with the inner gear ring, a crescent cavity is formed between the inner gear ring and the outer gear, the filling piece is arranged in the cavity, the filling piece comprises a first outer crescent block, a first inner crescent block, a second outer crescent block and a second inner crescent block, and the first outer crescent block, the first inner crescent block, the second outer crescent block and the second inner crescent block are arranged in the cavity. One end of each crescent block is provided with a connecting part with a pin hole, the positions of the connecting parts of the four crescent blocks are mutually staggered, the pin holes of the connecting parts are located on the same axis, a positioning pin is inserted into the pin holes, and the four crescent blocks can swing around the positioning pin; and rubber rods and elastic sheets are arranged between the first outer crescent block and the first inner crescent block and between the second outer crescent block and the second inner crescent block. According to the gear pump, forward and reverse rotation oil pumping can be achieved, the stability and flexibility of the inner and outer crescent blocks can be improved, and therefore the sealing effect of the gear pump is ensured through radial compensation of the inner and outer crescent blocks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear pump, in particular to an internal gear pump with filling piece. BACKGROUND

[0002] As a common pump device, the internal gear pump is widely used in various industrial occasions. The traditional internal gear pump is usually designed for one-way rotation, that is, it can only realize the oil pumping function in one direction. With the continuous development of industrial technology, higher requirements are put forward for the flexibility and adaptability of the oil pumping device. In the traditional internal gear pump, the sealing performance and the control of the addendum gap are the key factors affecting the oil pumping efficiency and stability. The traditional sealing method is prone to leakage, which reduces the oil pumping efficiency and even affects the normal operation of the equipment. At the same time, too large or too small addendum gap will directly affect the sealing performance and service life of the pump. In order to overcome these shortcomings, there is an urgent need in the market for an internal gear pump which can compensate radially, rotate bidirectionally, has excellent sealing performance and precise control of addendum gap. SUMMARY

[0003] The purpose of the present application is to provide an internal gear pump with filling piece, which improves the sealing performance and the control accuracy of the addendum gap through the radial compensation function of the filling piece.

[0004] The technical scheme of the present application is: an internal gear pump with filling piece, comprising a pump body, an inner gear ring and an external gear meshing with the inner gear ring, a crescent-shaped cavity is formed between the inner gear ring and the external gear, and a filling piece is arranged in the cavity, the filling piece comprises a first outer crescent block, a first inner crescent block, a second outer crescent block and a second inner crescent block, the first outer crescent block and the second outer crescent block each have an outer arc surface capable of abutting a plurality of addendum of the inner gear ring, the first inner crescent block and the second inner crescent block each have an inner arc surface capable of abutting a plurality of addendum of the external gear, one end of each of the four crescent blocks is provided with a connecting part with a pin hole, the positions of the connecting parts of the four crescent blocks are staggered, the pin holes of each connecting part are located on the same axis and are inserted with a positioning pin, and each of the four crescent blocks can swing around the positioning pin; a rubber rod and a spring are arranged between the first outer crescent block and the first inner crescent block and between the second outer crescent block and the second inner crescent block.

[0005] In the above technical scheme, since the filling piece is composed of four crescent blocks, each of the four crescent blocks can swing around the positioning pin through the pin hole of the connecting part, and a rubber rod and a spring are arranged between the first outer crescent block and the first inner crescent block and between the second outer crescent block and the second inner crescent block, the elastic force of the rubber rod and the spring can make the outer arc surfaces of the first outer crescent block and the second outer crescent block tightly abut the plurality of addendum of the inner gear ring, and make the inner arc surfaces of the first inner crescent block and the second inner crescent block tightly abut the plurality of addendum of the external gear, thereby realizing radial compensation and ensuring the sealing effect of the gear pump.

[0006] In one embodiment, the connecting portion of the first outer crescent block is adjacent to the connecting portion of the second inner crescent block, and the connecting portion of the first inner crescent block is adjacent to the connecting portion of the second outer crescent block.

[0007] The positioning pin is one or two coaxially arranged.

[0008] Further, the inner arc surface of the first outer crescent block and the second outer crescent block is provided with a limiting protrusion; preferably, the limiting protrusion is away from the connecting portion. The arrangement of the limiting protrusion can form a gap between the first outer crescent block and the first inner crescent block, and between the second outer crescent block and the second inner crescent block, and then high-pressure oil is introduced into the gap between the inner and outer crescent blocks for pressure compensation, thereby enhancing the effect of radial compensation.

[0009] Further, the outer arc surface of the first inner crescent block and the second inner crescent block is provided with a groove for mounting a rubber rod and a spring piece; preferably, the groove is located close to the connecting portion.

[0010] The gear pump provided by the application can realize forward and reverse rotation of pumping oil, and can improve the stability and flexibility of the inner and outer crescent blocks, thereby ensuring the sealing effect of the gear pump through radial compensation of the inner and outer crescent blocks. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the gear pump in the embodiment of the application;

[0012] Figure 2 It is a schematic diagram of the combined structure of the filler and the positioning pin in the embodiment of the application;

[0013] Figure 3 It is a schematic diagram of the filler structure in the embodiment of the application;

[0014] Figure 4 It is a schematic diagram of the structure of the first outer crescent block in the embodiment of the application;

[0015] Figure 5 It is a schematic diagram of the structure of the first inner crescent block in the embodiment of the application;

[0016] Figure 6 It is a schematic diagram of the structure of the second outer crescent block in the embodiment of the application;

[0017] Figure 7 It is a schematic diagram of the structure of the second inner crescent block in the embodiment of the application;

[0018] The reference signs are:

[0019] 1. Pump body; 2. Internal gear ring; 3. External gear; 4. First outer crescent block; 5. First inner crescent block; 6. Second outer crescent block; 7. Second inner crescent block; 8. First locating pin; 9. Second locating pin shaft; 10. Rubber rod; 11. Spring piece; 12. Groove; 13. Limiting protrusion. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0021] It should be noted in advance that, in this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] like Figures 1 to 7 As shown, an internal gear pump with a filler includes a pump body 1, a pump cover, an internal gear ring 2, and an external gear 3 internally meshing with the internal gear ring 2. A crescent-shaped cavity is formed between the internal gear ring 2 and the external gear 3. A filler is disposed in the cavity. The filler includes a first outer crescent block 4, a first inner crescent block 5, a second outer crescent block 6, and a second inner crescent block 7. The first outer crescent block 4 and the second outer crescent block 6 each have an outer arc surface that can fit against multiple tooth tips of the internal gear ring 2. The first inner crescent block 5 and the second inner crescent block 7 each have multiple teeth that can fit against the external gear 3. The inner arc surface of the top-fitting part has a connecting part with a pin hole at one end of each of the four crescent blocks. The positions of the connecting parts of the four crescent blocks are staggered. The pin holes of each connecting part are located on the same axis and are inserted with positioning pins. All four crescent blocks can swing around the positioning pins. Rubber rods 10 and spring pieces 11 are provided between the first outer crescent block 4 and the first inner crescent block 5, and between the second outer crescent block 6 and the second inner crescent block 7. The outer arc surfaces of the first inner crescent block 5 and the second inner crescent block 7 are provided with grooves 12 for installing rubber rods 10 and spring pieces 11. The grooves 12 are located close to the connecting parts.

[0023] like Figure 2 , 3As shown, in the embodiment, the connecting portion of the first outer crescent block 4 is adjacent to the connecting portion of the second inner crescent block 7 and is connected by inserting the first positioning pin 8 into the pin hole, the outer end of the first positioning pin 8 is fixedly installed on the pump body 1, the connecting portion of the first inner crescent block 5 is adjacent to the connecting portion of the second outer crescent block 6 and is connected by inserting the second positioning pin into the pin hole, the outer end of the second positioning pin is fixedly installed on the pump cover, and the first positioning pin 8 and the second positioning pin are located on the same axis. Based on the same inventive concept, the first positioning pin 8 and the second positioning pin can also be combined into a long positioning pin, but this will slightly increase the weight.

[0024] The working principle of the embodiment is that since the filler is composed of four crescent blocks, the four crescent blocks can swing around the positioning pin through the pin hole of the connecting portion, and the rubber rod 10 and the elastic sheet 11 are arranged between the first outer crescent block 4 and the first inner crescent block 5 and between the second outer crescent block 6 and the second inner crescent block 7, the elastic force of the rubber rod 10 and the elastic sheet 11 can make the outer arc surfaces of the first outer crescent block 4 and the second outer crescent block 6 tightly abut the multiple tooth tips of the inner gear ring 2, and make the inner arc surfaces of the first inner crescent block 5 and the second inner crescent block 7 tightly abut the multiple tooth tips of the outer gear 3, thereby realizing radial compensation and ensuring the sealing effect of the gear pump.

[0025] As a further technical solution, the inner arc surfaces of the first outer crescent block 4 and the second outer crescent block 6 are each provided with a limiting protrusion 13, which is away from the connecting portion. The arrangement of the limiting protrusion 13 can form a certain gap between the first outer crescent block 4 and the first inner crescent block 5 and between the second outer crescent block 6 and the second inner crescent block 7, and then pressure compensation is performed by introducing high-pressure oil into the gap between the inner and outer crescent blocks, thereby enhancing the effect of radial compensation.

[0026] The above embodiment is a preferred implementation scheme of the present application, in addition to this, the present application can also be implemented in other ways, any obvious replacement without departing from the technical solution concept of the present application is within the protection scope of the present application.

[0027] In order for those skilled in the art to more conveniently understand the improvements of the present application over the prior art, some drawings and descriptions of the present application have been simplified, and some other elements have also been omitted in the present application file for the sake of clarity, those skilled in the art should realize that these omitted elements can also constitute the content of the present application.

Claims

1. An internal gear pump with a filler, comprising a pump body (1), an internal gear ring (2), and an external gear (3) internally meshing with the internal gear ring (2), wherein a crescent-shaped cavity is formed between the internal gear ring (2) and the external gear (3), and a filler is disposed in the cavity, characterized in that: The filler includes a first outer crescent block (4), a first inner crescent block (5), a second outer crescent block (6), and a second inner crescent block (7). The first outer crescent block (4) and the second outer crescent block (6) each have an outer arc surface that can fit with multiple tooth tips of the internal gear ring (2). The first inner crescent block (5) and the second inner crescent block (7) each have an inner arc surface that can fit with multiple tooth tips of the external gear (3). One end of each of the four crescent blocks is provided with a connecting part with a pin hole. The positions of the connecting parts of the four crescent blocks are staggered. The pin holes of each connecting part are located on the same axis and are inserted with positioning pins. All four crescent blocks can swing around the positioning pins. A rubber rod (10) and a spring piece (11) are provided between the first outer crescent block (4) and the first inner crescent block (5), and between the second outer crescent block (6) and the second inner crescent block (7).

2. The internal gear pump with filler according to claim 1, characterized in that: The connecting part of the first outer crescent block (4) is adjacent to the connecting part of the second inner crescent block (7), and the connecting part of the first inner crescent block (5) is adjacent to the connecting part of the second outer crescent block (6).

3. The internal gear pump with a filler according to claim 1 or 2, characterized in that: The positioning pin can be one or two pins arranged coaxially.

4. The internal gear pump with a filler according to claim 1 or 2, characterized in that: The inner arc surfaces of the first outer crescent block (4) and the second outer crescent block (6) are both provided with limiting protrusions (13).

5. The internal gear pump with filler according to claim 4, characterized in that: The limiting protrusion (13) is away from the connecting part.

6. The internal gear pump with a filler according to claim 1 or 2, characterized in that: The outer arc surfaces of the first inner crescent block (5) and the second inner crescent block (7) are provided with grooves (12) for installing rubber rods (10) and spring pieces (11).

7. The internal gear pump with filler according to claim 6, characterized in that: The groove (12) is located near the connecting part.

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