Radial compensation internal gear pump

Abstract

The utility model discloses a radial compensation internal gear pump which is characterized in that an inner crescent block and an outer crescent block are arranged between a large gear and a small gear from inside to outside, and a round bar and an elastic sheet are arranged between the inner crescent block and the outer crescent block; an inclined groove and a groove are formed in the periphery of the inner crescent block, the elastic piece is arranged in the inclined groove, the round rod is arranged in the groove, the round rod is parallel to the transmission shaft, the two sides of the elastic piece abut against the periphery of the inner crescent block and the inner periphery of the outer crescent block, and the small gear, the inner crescent block, the elastic piece, the outer crescent block and the large gear make contact in sequence. According to the radial compensation internal gear pump provided by the utility model, through the innovative design of the crescent sealing ring and the separated crescent block, forward and reverse rotation oil pumping of the pump is realized, and meanwhile, the sealing performance and the control precision of the tooth top clearance are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid machinery, in particular to a radial compensation internal meshing gear pump. Background Art

[0002] Internal gear pumps are a common type of pumping equipment and are widely used in various industrial applications. Traditional internal gear pumps are usually designed for unidirectional rotation, meaning they can only pump oil in one direction. With the continuous development of industrial technology, higher requirements are being placed on the flexibility and adaptability of oil pumping equipment. In traditional internal gear pumps, sealing performance and the control of tooth tip clearance are key factors affecting pumping efficiency and stability. Traditional sealing methods are prone to leakage, resulting in reduced pumping efficiency and even affecting the normal operation of the equipment. At the same time, excessive or insufficient tooth tip clearance will directly affect the sealing performance and service life of the pump. To overcome these shortcomings, the market is in urgent need of an internal gear pump that can perform radial compensation, bidirectional rotation, excellent sealing performance, and precise tooth tip clearance control. Utility Model Content

[0003] In view of the above-mentioned shortcomings, the utility model provides a radially compensated internal meshing gear pump, which realizes the forward and reverse rotation of the pump to pump oil through the innovative design of a crescent-shaped sealing ring and a separate crescent block, while improving the sealing performance and the control accuracy of the tooth top clearance.

[0004] In order to achieve the above-mentioned purpose, the embodiments of the present invention adopt the following technical solutions:

[0005] The gear train is connected to the gear axle by a toothed connecting gear, and the toothed connecting gear is connected to the gear train by a toothed connecting gear.

[0006] In one embodiment, the inner crescent block and the outer crescent block are both arc-shaped, and the inner crescent block presses inward against the pinion under the reaction force of the elastic sheet.

[0007] In one embodiment, the inner crescent block and the outer crescent block are positioned with the pump body by positioning pins. There are two inner crescent blocks, and a main axial positioning groove is formed between the two inner crescent blocks; there are two outer crescent blocks, and a secondary axial positioning groove is formed between the two outer crescent blocks. The main axial positioning groove and the secondary axial positioning groove constitute the crescent axial positioning groove.

[0008] In one embodiment, one end of the positioning pin is connected to the pump body, and the other end is provided with a positioning boss adapted to the crescent axial positioning groove, and the positioning boss is placed in the crescent axial positioning groove.

[0009] In one embodiment, a first push plate is provided between the large gear and the pump body, a second push plate is provided between the large gear and the pump cover, a first rubber ring is provided between the first push plate and the pump body, and a second rubber ring is provided between the second push plate and the pump cover.

[0010] In one embodiment, the outer periphery of the transmission shaft and the inner periphery of the pinion gear are driven by a polygonal structure, and both are driven by a hexagonal structure.

[0011] In one embodiment, the outer periphery of the small gear and the inner periphery of the large gear are driven by gear meshing.

[0012] In one embodiment, a bushing is provided on the outer side surface of the large gear.

[0013] The beneficial effect of the present invention is that it provides a radially compensated internal meshing gear pump that can pump oil in forward and reverse rotation, thereby improving the flexibility and adaptability of the oil pump; the design of an inner crescent block and an outer crescent block is adopted, and a round rod and a spring piece are provided between the inner crescent block and the outer crescent block, and an inclined groove and a groove are opened on the outer periphery of the inner crescent block, and the opening of the inclined groove points to the outer crescent block, the spring piece is placed in the inclined groove, and the round rod is placed in the groove, and the round rod is parallel to the transmission shaft, and the two sides of the spring piece are against the outer periphery of the inner crescent block and the inner periphery of the outer crescent block, and the inner crescent block presses inward against the small gear under the reaction force of the spring piece, and under the action of oil pressure and the spring piece, the crescent block can better fit the tooth top to reduce leakage; the positional relationship between the small gear and the inner crescent block is jointly positioned by the locating pin and the elastic locating pin, so that the positioning is more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of the radial compensation internal gear pump described in the present utility model;

[0016] Figure 2 This is a plan view of the connection structure between the pinion and the gear according to the present invention;

[0017] Figure 3 This is a schematic structural diagram of the outer crescent block described in the present utility model.

[0018] The accompanying drawings are marked as follows: 1. Pump body; 2. Pump cover; 3. Drive shaft; 4. Pinion; 5. Large gear; 6. Inner crescent block; 7. Outer crescent block; 8. Bevel groove; 9. Groove; 10. Spring piece; 11. Round rod; 12. Locating pin; 13. Elastic locating pin; 14. First push plate; 15. Second push plate; 16. First rubber ring; 17. Second rubber ring; 18. Bushing. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0020] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, features qualified as "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 、 Figure 2 、 Figure 3 As shown, this embodiment provides a radially compensated internal gear pump, including a pump body 1, a pump cover 2 and a transmission shaft 3. The pump body 1 and the pump cover 2 are fixedly connected by fasteners, and the fasteners can be bolt assemblies; the transmission shaft 3 is passed through the pump body 1, and the outer periphery of the transmission shaft 3 is connected to the pinion 4 through transmission, and the outer periphery of the pinion 4 is connected to the large gear 5 through transmission, and the transmission shaft 3 drives the pinion 4 to rotate.

[0024] In practice, an inner crescent block 6 and an outer crescent block 7 are positioned between the pinion 4 and the large gear 5, running from the inside out. The outer crescent block has a through slot on the side closest to the pinion, and the inner crescent block fits within the slot. In this embodiment, the outer crescent block is a large crescent block, and the inner crescent block is a small crescent block. The outer side of the large crescent block mates with the tooth tops of the large gear, while the inner side of the small crescent block mates with the pinion. Because the large gear has a larger diameter than the pinion, this "large fits large, small fits small" design approach is more rational.

[0025] A round rod 11 and a spring clip 10 are positioned between the inner and outer crescent blocks 6, 7. The pinion 4, inner crescent block 6, spring clip 10, outer crescent block 7, and gear 5 are in contact with each other in sequence. In this embodiment, the inner and outer crescent blocks 6, 7 are both arc-shaped. A beveled groove 8 and a groove 9 are formed on the outer periphery of the inner crescent block 6. The opening of the beveled groove 8 points toward the outer crescent block 7. The spring clip 10 is placed within the beveled groove 8, and the round rod 11 is placed within the groove 9. The round rod 11 is parallel to the transmission shaft 3. The two sides of the spring clip 10 press against the outer periphery of the inner crescent block 6 and the inner periphery of the outer crescent block 7. Under the reaction force of the spring clip 10, the inner crescent block 6 presses inward against the pinion 4. The spring clip 10 provides elastic force, enabling the crescent blocks to quickly separate and fit against the gear tooth tops, effectively reducing tooth tip clearance. The round rod 11 blocks the oil channel, preventing oil from roaming within the pump body 1 and ensuring smooth oil flow.

[0026] In practice, the inner and outer crescent blocks 6 and 7 are positioned relative to the pump body 1 via locating pins 12. In this embodiment, there are two inner crescent blocks, with a primary axial locating groove between them. There are two outer crescent blocks, with a secondary axial locating groove between them. The primary and secondary axial locating grooves constitute the crescent axial locating grooves. One end of the locating pin 12 is connected to the pump body 1, while the other end is provided with a locating boss that fits within the crescent axial locating groove. In this embodiment, the locating pins employ a wedge-shaped positioning mechanism to ensure stable positioning between the crescent blocks.

[0027] A positioning pin hole is also provided on the inner crescent block 6, and an elastic positioning pin 13 is provided in the positioning pin hole. The elastic positioning pin 13 cooperates with the push plate hole opened on the push plate, so that the crescent block can be pressed and rotated around it to fit the tooth top of the pinion 4.

[0028] In actual application, the outer periphery of the driving shaft and the inner periphery of the pinion 4 are driven by a polygonal structure. In this embodiment, they are driven by a hexagonal structure. The outer periphery of the pinion 4 and the inner periphery of the large gear 5 are driven by gear meshing.

[0029] In actual use, a first push plate 14 is installed between the large gear 5 and the pump body 1, and a second push plate 15 is installed between the large gear 5 and the pump cover 2. A first rubber ring 16 is installed between the first push plate 14 and the pump body 1, and a second rubber ring 17 is installed between the second push plate 15 and the pump cover 2. The rubber rings are both crescent-shaped rubber rings. These rubber sealing rings not only provide sealing but also use elastic force to push the push plate, allowing the oil pump to operate with a small gap and reduce leakage. A bushing 18 is installed on the outer side of the large gear 5 to prevent wear of the large gear 5.

[0030] The radially compensated internal gear pump of the present invention can pump oil in forward and reverse rotation, which improves the flexibility and adaptability of pumping oil; it adopts the design of inner crescent block 6 and outer crescent block 7, and a round rod 11 and a spring piece 10 are provided between the inner crescent block 6 and the outer crescent block 7. An inclined groove 8 and a groove 9 are opened on the outer periphery of the inner crescent block 6, and the opening of the inclined groove 8 points to the outer crescent block 7. The spring piece 10 is placed in the inclined groove 8, and the round rod 11 is placed in the groove 9. The round rod 11 is parallel to the transmission shaft 3, and the two sides of the spring piece 10 press against the outer periphery of the inner crescent block 6 and the inner periphery of the outer crescent block 7. The inner crescent block 6 presses inward against the pinion 4 under the reaction force of the spring piece 10. Under the action of oil pressure and the spring piece 10, the crescent block can better fit the tooth top to reduce leakage; the positional relationship between the pinion 4 gear and the inner crescent block 6 is jointly positioned by the locating pin 12 and the elastic locating pin 13, so that the positioning is more accurate.

[0031] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of the present invention patent.

[0032] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in this field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A radially compensated internal gear pump, comprising a pump body (1), a pump cover (2) and a transmission shaft (3), wherein the pump body (1) and the pump cover (2) are fixedly connected by fasteners, the transmission shaft (3) is inserted into the pump body (1), the outer periphery of the transmission shaft (3) is connected to a pinion (4), the outer periphery of the pinion (4) is connected to a gear (5), and the transmission shaft (3) drives the pinion (4) to rotate, characterized in that: An inner crescent block (6) and an outer crescent block (7) are provided between the large gear (5) and the small gear (4) from the inside to the outside. The outer crescent block is provided with a through groove on the side close to the small gear. The inner crescent block is embedded in the through groove. A round rod (11) and a spring piece (10) are provided between the inner crescent block (6) and the outer crescent block (7). An oblique groove (8) and a groove (9) are provided on the outer periphery of the inner crescent block (6). The spring piece (10) is placed in the oblique groove (8), and the round rod (11) is placed in the groove (9). The round rod (11) is parallel to the transmission shaft (3). Both sides of the spring piece (10) abut against the outer periphery of the inner crescent block (6) and the inner periphery of the outer crescent block (7). The small gear (4), the inner crescent block (6), the spring piece (10), the outer crescent block (7), and the large gear (5) are in contact with each other in sequence.

2. The radially compensated internal gear pump according to claim 1, characterized in that: The inner crescent block (6) and the outer crescent block (7) are both arc-shaped, and the inner crescent block (6) presses inward against the pinion (4) under the reaction force of the spring piece (10).

3. The radially compensated internal gear pump according to claim 1, characterized in that: The inner crescent block (6) and the outer crescent block (7) are positioned with the pump body (1) via positioning pins (12). There are two inner crescent blocks, and a main axial positioning groove is formed between the two inner crescent blocks; there are two outer crescent blocks, and a secondary axial positioning groove is formed between the two outer crescent blocks. The main axial positioning groove and the secondary axial positioning groove constitute the crescent axial positioning groove.

4. The radially compensated internal gear pump according to claim 3, characterized in that: One end of the positioning pin (12) is connected to the pump body (1), and the other end is provided with a positioning boss adapted to the crescent axial positioning groove, and the positioning boss is placed in the crescent axial positioning groove.

5. The radially compensated internal gear pump according to claim 1, characterized in that: A first push plate (14) is provided between the large gear (5) and the pump body (1), a second push plate (15) is provided between the large gear (5) and the pump cover (2), a first rubber ring (16) is provided between the first push plate (14) and the pump body (1), and a second rubber ring (17) is provided between the second push plate (15) and the pump cover (2).

6. The radially compensated internal gear pump according to claim 1, characterized in that: The outer periphery of the transmission shaft (3) and the inner periphery of the pinion (4) adopt a polygonal structure for transmission, and both adopt a hexagonal structure for transmission.

7. The radially compensated internal gear pump according to claim 1, characterized in that: The outer periphery of the small gear (4) and the inner periphery of the large gear (5) are driven by gear meshing.

8. The radially compensated internal gear pump according to claim 1, characterized in that: A bushing (18) is provided on the outer side surface of the large gear (5).

Images