Internal gear pump with crescent block

Abstract

This utility model provides an internal gear pump with crescent-shaped blocks, including a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. An outer crescent-shaped block and an inner crescent-shaped block are disposed between the internal gear ring and the external gear. The outer crescent-shaped block has an outer arc surface that can engage with multiple tooth tips of the internal gear ring. The inner crescent-shaped block is composed of a first inner crescent-shaped block and a second inner crescent-shaped block, both of which have inner arc surfaces that can engage with multiple tooth tips of the external gear. A positioning pin is installed between the first and second inner crescent-shaped blocks. A pin hole is provided at one end of each of the first and second inner crescent-shaped blocks near the positioning pin for installing a rotating pin. The first and second inner crescent-shaped blocks can rotate around the rotating pin. A notch is provided in the middle of the outer crescent-shaped block corresponding to the positions of the two positioning pins. Rubber rods and springs are provided between the outer crescent-shaped block and the first and second inner crescent-shaped blocks to compensate for the radial clearance between the inner and outer crescent-shaped blocks.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to an internal meshing gear pump with a crescent-shaped block. Background Technology

[0002] Internal gear pumps, as a common type of pump, are widely used in various industrial applications. Traditional internal gear pumps are typically designed for unidirectional rotation, meaning they can only pump oil in one direction. With the continuous development of industrial technology, higher demands are placed on the flexibility and adaptability of pumping equipment. In traditional internal gear pumps, sealing performance and gear tip clearance control are key factors affecting pumping efficiency and stability. Traditional sealing methods are prone to leakage problems, leading to reduced pumping efficiency and even affecting the normal operation of the equipment. Simultaneously, excessively large or small gear tip clearances directly affect the pump's sealing performance and service life. To overcome these shortcomings, there is an urgent market need for an internal gear pump that can radially compensate, rotate bidirectionally, has excellent sealing performance, and precisely control the gear tip clearance. Utility Model Content

[0003] The purpose of this invention is to provide an internal gear pump with a crescent block, which improves sealing performance and control accuracy of gear tip clearance through the radial compensation function of the crescent block.

[0004] The technical solution of this utility model is: an internal gear pump with crescent-shaped blocks, comprising a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. Oil distribution plates are installed between the internal gear ring and the pump body and pump cover. A crescent-shaped cavity is formed between the internal gear ring and the external gear. A filler is provided within this cavity. The filler includes stacked outer crescent blocks and inner crescent blocks. The outer crescent blocks have an outer arc surface that can conform to multiple tooth tips of the internal gear ring. The inner crescent blocks are composed of a first inner crescent block and a second inner crescent block. The first and second inner crescent blocks each have an inner arc surface that can engage with multiple tooth tips of the external gear. A positioning pin is installed between the first and second inner crescent blocks. A pin hole is provided at one end of the first and second inner crescent blocks near the positioning pin for installing a rotating pin. The first and second inner crescent blocks can rotate around the rotating pin. A notch is provided in the middle of the outer crescent block corresponding to the position of the two positioning pins. A rubber rod and a spring are provided between the outer crescent block and the first and second inner crescent blocks.

[0005] In the above technical solution, since rubber rods and spring sheets are provided between the outer crescent block and the first inner crescent block and the second inner crescent block, the outer arc surface of the outer crescent block can be tightly fitted with the multiple tooth tips of the inner gear ring, and the inner arc surfaces of the first inner crescent block and the second inner crescent block can be tightly fitted with the multiple tooth tips of the outer gear, thereby reducing leakage. The inner crescent block is positioned by a locating pin and an elastic pin, making the positioning more accurate. The outer crescent block is integral and positioned by a locating pin, so that the force on the outer crescent block is balanced, reducing the amount of movement of the outer crescent block in the circumferential direction, and reducing the mechanical noise caused by movement when the oil pump switches between forward and reverse directions.

[0006] In one embodiment, there are two positioning pins, one of which is fixedly mounted on the pump body at its outer end, and the other is fixedly mounted on the pump cover at its outer end. The inner ends of both positioning pins are inserted between the first inner crescent block and the second inner crescent block.

[0007] In one embodiment, the rotating pin is a cylindrical pin or a spring pin.

[0008] In one embodiment, the length of the outer crescent block is less than the length of the inner crescent block, and each of the outer arc surfaces of the first and second inner crescent blocks is provided with a limiting protrusion, which respectively contacts and engages with the two ends of the outer crescent block.

[0009] In one embodiment, the outer arc surfaces of both the first inner crescent block and the second inner crescent block are provided with grooves for installing rubber rods and spring sheets, and the grooves are located close to the rotating pin.

[0010] In one embodiment, the oil distribution plate is provided with an eccentric shaft hole, a positioning pin hole, two rotating pin holes and two oil inlet holes, and the two oil inlet holes correspond to the gaps between the outer crescent block and the first inner crescent block and the second inner crescent block, respectively.

[0011] The gear pump provided by this utility model can realize forward and reverse rotation for 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. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the exploded structure of the gear pump in Embodiment 1 of this utility model;

[0013] Figure 2 This is a three-dimensional structural diagram of the gear pump in Embodiment 1 of this utility model;

[0014] Figure 3 This is a cross-sectional view of the gear pump in Embodiment 1 of this utility model;

[0015] Figure 4 This is a schematic diagram of the inner and outer crescent block structure in Embodiment 1 of this utility model;

[0016] Figure 5 This is a schematic diagram of the oil distribution plate structure in embodiments 1 and 2 of this utility model;

[0017] Figure 6 This is a cross-sectional view of the gear pump in Embodiment 2 of this utility model;

[0018] Figure 7 This is a schematic diagram of the inner and outer crescent block structure in Embodiment 2 of this utility model;

[0019] The attached figures are labeled as follows:

[0020] 1. Pump body; 2. Internal gear ring; 3. External gear; 4. Outer crescent block; 5. First inner crescent block; 6. Second inner crescent block; 7. Locating pin; 8. Rotary pin; 9. Rubber rod; 10. Spring; 11. Oil distribution plate; 12. Eccentric shaft hole; 13. Locating pin hole; 14. Rotary pin hole; 15. Oil inlet hole. Detailed Implementation

[0021] 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.

[0022] It should be noted in advance that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" in this utility model 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 utility model according to the specific circumstances.

[0023] Example 1

[0024] like Figures 1 to 5As shown, an internal gear pump with crescent-shaped blocks 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. Oil distribution plates 11 are installed between the internal gear ring 2 and the pump body 1 and pump cover. A crescent-shaped cavity is formed between the internal gear ring 2 and the external gear 3. A filler is provided within this cavity. The filler includes an outer crescent-shaped block 4 and an inner crescent-shaped block stacked together. The outer crescent-shaped block 4 has an outer arc surface that can engage with multiple tooth tips of the internal gear ring 2. The inner crescent-shaped block is composed of a first inner crescent-shaped block 5 and a second inner crescent-shaped block 6, both of which have multiple tooth tips that can engage with the external gear 3. The inner arc surface of the outer crescent block 4 has a positioning pin 7 installed between the first inner crescent block 5 and the second inner crescent block 6. The first inner crescent block 5 and the second inner crescent block 6 are provided with pin holes near the positioning pin 7 for installing a rotating pin 8. The first inner crescent block 5 and the second inner crescent block 6 can rotate around the rotating pin 8. The middle part of the outer crescent block 4 is provided with a notch corresponding to the position of the two positioning pins 7. The outer crescent block 4 is provided with a rubber rod 9 and a spring piece 10 between it and the first inner crescent block 5 and the second inner crescent block 6. The outer arc surface of the first inner crescent block 5 and the second inner crescent block 6 is provided with a groove for installing the rubber rod 9 and the spring piece 10. The groove is located near the rotating pin 8.

[0025] There are two positioning pins 7. The outer end of one positioning pin 7 is fixedly installed on the pump body 1, and the outer end of the other positioning pin 7 is fixedly installed on the pump cover. The inner ends of both positioning pins 7 are inserted between the first inner crescent block 5 and the second inner crescent block 6. The rotating pin 8 is a cylindrical pin or a spring pin.

[0026] like Figure 5 As shown, the oil distribution plate 11 has an eccentric shaft hole 12, a positioning pin hole 7, two rotating pin holes 8 and two oil inlet holes 15. The two oil inlet holes 15 correspond to the gaps between the outer crescent block 4 and the first inner crescent block 5 and the second inner crescent block 6, respectively.

[0027] The working principle of this embodiment is as follows: Since the inner crescent is composed of two crescent blocks, both of which can swing around the rotating pin 8, and rubber rods 9 and spring sheets 10 are provided between the outer crescent block 4 and the first inner crescent block 5 and the second inner crescent block 6, the elasticity of the rubber rods 9 and spring sheets 10 can make the outer arc surface of the outer crescent block 4 tightly adhere to 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 6 tightly adhere to the multiple tooth tips of the outer gear 3, thereby compensating for the radial clearance and ensuring the sealing effect of the gear pump; Since the two oil inlet holes 15 of the oil distribution plate 11 correspond to the gaps between the outer crescent block 4 and the first inner crescent block 5 and the second inner crescent block 6 respectively, high-pressure oil can be introduced into the gap between the inner and outer crescent blocks for pressure compensation, thereby enhancing the radial compensation effect.

[0028] Example 2

[0029] like Figure 6 , 7 As shown, the gear pump provided in this embodiment has a structure that is basically the same as that in embodiment 1. The difference is that the length of the outer crescent block 4 is less than the length of the inner crescent block. The outer arc surface of the first inner crescent block 5 and the second inner crescent block 6 are each provided with a limiting protrusion. The two limiting protrusions are respectively in contact with the two ends of the outer crescent block 4.

[0030] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

[0031] To facilitate understanding by those skilled in the art of the improvements of this utility model over the prior art, some of the drawings and descriptions of this utility model have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this utility model.

Claims

1. An internal gear pump with a crescent-shaped block, comprising 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), wherein an oil distribution plate (11) is installed between the internal gear ring (2), the pump body (1), and the pump cover, and a crescent-shaped cavity is formed between the internal gear ring (2) and the external gear (3), wherein a filler is provided in the cavity, characterized in that: The filler includes an outer crescent block (4) and an inner crescent block stacked together. The outer crescent block (4) has an outer arc surface that can fit with multiple tooth tips of the internal gear ring (2). The inner crescent block is composed of a first inner crescent block (5) and a second inner crescent block (6). Both the first inner crescent block (5) and the second inner crescent block (6) have inner arc surfaces that can fit with multiple tooth tips of the external gear (3). A positioning pin (7) is installed between the first inner crescent block (5) and the second inner crescent block (6). The first inner crescent block (5) and the second inner crescent block (6) are provided with pin holes at the end near the positioning pin (7) for installing the rotating pin (8). The first inner crescent block (5) and the second inner crescent block (6) can rotate around the rotating pin (8). The middle part of the outer crescent block (4) is provided with a notch corresponding to the position of the two positioning pins (7). A rubber rod (9) and a spring piece (10) are provided between the outer crescent block (4) and the first inner crescent block (5) and the second inner crescent block (6).

2. The internal gear pump with crescent-shaped blocks according to claim 1, characterized in that: The number of positioning pins (7) is two. The outer end of one positioning pin (7) is fixedly installed on the pump body (1), and the outer end of the other positioning pin (7) is fixedly installed on the pump cover. The inner ends of both positioning pins (7) are inserted between the first inner crescent block (5) and the second inner crescent block (6).

3. The internal gear pump with crescent-shaped blocks according to claim 1 or 2, characterized in that: The rotating pin (8) is a cylindrical pin or a spring pin.

4. The internal gear pump with crescent-shaped blocks according to claim 1 or 2, characterized in that: The length of the outer crescent block (4) is less than the length of the inner crescent block. Each of the outer arc surfaces of the first inner crescent block (5) and the second inner crescent block (6) is provided with a limiting protrusion. The two limiting protrusions are respectively in contact with the two ends of the outer crescent block (4).

5. The internal gear pump with crescent-shaped blocks 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 (6) are provided with grooves for installing rubber rods (9) and spring pieces (10), and the grooves are located close to the rotating pin (8).

6. The internal gear pump with crescent-shaped blocks according to claim 1 or 2, characterized in that: The oil distribution plate (11) is provided with an eccentric shaft hole (12), a positioning pin hole (7), two rotating pin holes (8) and two oil inlet holes (15), and the two oil inlet holes (15) correspond to the gaps between the outer crescent block (4) and the first inner crescent block (5) and the second inner crescent block (6), respectively.

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