Clearance compensation assembly and bidirectional internal gear pump

Abstract

The clearance compensation assembly comprises a main crescent plate, two auxiliary crescent plates, an elastic piece and a sealing piece, a stop groove is formed in the right middle of the main crescent plate, a groove area, a high-pressure oil liquid inflow area and a limiting protrusion are symmetrically arranged on the outer arc side of the main crescent plate, a groove is formed in the groove area, the two axial end faces of the high-pressure oil liquid inflow area are inwards concaved to form inclined faces, and the limiting protrusion is arranged on the limiting protrusion. The auxiliary crescent plate is arranged above the groove area and the high-pressure oil liquid inflow area, and an oil guide cavity is formed between the inner arc section of the auxiliary crescent plate and the inclined faces of the two axial end faces of the high-pressure oil liquid inflow area in a spaced mode. The elastic piece and the sealing piece are arranged in the groove in an abutting mode, the elastic piece is installed below the sealing piece, and the sealing piece is attached to the main crescent-shaped plate and the auxiliary crescent-shaped plate in a sealed mode. The utility model further provides a bidirectional internal gear pump which comprises the backlash compensation assembly. The sealing piece can be connected and sealed with the main crescent plate and the auxiliary crescent plate more tightly under the high-pressure extrusion effect of oil liquid, oil liquid internal leakage can be effectively prevented, and the service life of the gear pump is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of internal gear pumps, and particularly relates to a component with clearance compensation function and a bidirectional internal gear pump. Background Technology

[0002] Internal gear pumps offer advantages such as low flow pulsation, compact structure, light weight, low noise, and high efficiency, while also preventing oil trapping. They are widely used in industries such as petroleum, chemicals, coatings, dyes, food, oils, and pharmaceuticals. Internal gear pumps also have important applications in fields such as oil refining, adhesive production, ink manufacturing, cosmetics production, electronics, automobile manufacturing, shipbuilding, mining machinery, papermaking, leather processing, glass manufacturing, rubber processing, casting, forging, heat treatment, and aerospace.

[0003] Existing internal gear pumps use a movable crescent plate to separate the high and low pressure chambers and form radial pressure compensation, so that a seal with almost no gap is formed between the tip of the internal and external gears and the crescent plate. The axial moving compensation disc ensures a good seal of the axial gap, so that the internal leakage of the pump is minimized. Although the internal gear pump with this structure has a good sealing effect, internal leakage is still unavoidable. Patent application CN 119333388 A, entitled "A Bidirectional Internal Gear Pump with Clearance Compensation Function," discloses a bidirectional internal gear pump with clearance compensation function. It features a main crescent plate and two auxiliary crescent plates. The outer arc of the main crescent plate has a protruding contact, and the inner arc of each auxiliary crescent plate has a recessed groove matching the contact. The contact connects to the groove. When oil enters, the high-pressure zones of the main and auxiliary crescent plates open and press against the tips of the inner and outer gear teeth, while the low-pressure sides of the auxiliary crescent plates move closer to and press against the contact of the main crescent plate, thus achieving radial clearance compensation. Although this design has clearance compensation, the connection between the contact and the groove is rigid. In actual manufacturing, insufficient precision and processing errors can occur, leading to poor sealing and internal leakage, affecting equipment use. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology described above and to provide a component with clearance compensation function and a bidirectional internal meshing gear pump.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A gap compensation component includes a main crescent plate, two secondary crescent plates, a spring, and a seal. The main crescent plate has a crescent-shaped symmetrical structure. A stop groove is provided in the center of the main crescent plate in the axial direction. A groove area, a high-pressure oil inflow area, and a limiting protrusion are symmetrically arranged along the outer arc side of the main crescent plate from the stop groove to both ends. The groove area has a groove, and the high-pressure oil inflow area has an inclined surface that is recessed inward at both ends along the axial direction.

[0007] Two secondary crescent plates are symmetrically arranged along the central axis of the main crescent plate above the groove area on the outer arc side of the main crescent plate and the high-pressure oil inflow area. The bottom end face of the secondary crescent plate contacts the limiting protrusion. The connection between the bottom end face of the secondary crescent plate and the side end face of the secondary crescent plate is set as an inwardly concave trapezoidal shape. The bottom end face of the secondary crescent plate is provided with rounded corners between the outer arc surface and the inner arc surface of the secondary crescent plate. An oil guide cavity is formed between the inner arc section of the secondary crescent plate and the inclined surfaces of the two axial end faces of the high-pressure oil inflow area.

[0008] The seal is located on the side of the groove opening that contacts the secondary crescent plate, and the seal is in a sealed fit with both the primary crescent plate and the secondary crescent plate.

[0009] The spring and the seal are abutted in the groove, with the spring installed below the seal.

[0010] Preferably, the material of the seal is polyetheretherketone, polyurethane, thermoplastic elastomer, nitrile rubber, aramid fiber reinforced rubber, or rubber-metal composite material.

[0011] Preferably, the seal is a cylindrical seal.

[0012] Preferably, the spring has an arc-shaped structure.

[0013] Furthermore, the grooves are symmetrically arranged along the central axis of the main crescent plate.

[0014] A bidirectional internal gear pump includes an internal gear ring for internal meshing, an external gear that meshes with a portion of the teeth of the internal gear ring, two stop pins, and a pump body for mounting the internal gear ring and the external gear. A gradually narrowing annular space is formed between the tooth tip circles of the internal gear ring and the external gear. A clearance compensation component is provided within the annular space. The inner arc of the main crescent plate of the clearance compensation component abuts against the outer ring teeth of the external gear, and the outer arc of the secondary crescent plate of the clearance compensation component abuts against the inner teeth of the internal gear ring. The stop pins are engaged and connected in the stop groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention has an oil guide cavity formed by the inward recess of the inclined surface on the outer arc side of the main crescent plate and the inner arc segment of the secondary crescent plate, which is conducive to the rapid entry of oil into the high pressure chamber. The seal is tightly fitted with the main crescent plate and the secondary crescent plate, and can be more tightly connected and sealed under the high pressure of the oil pressure, which can effectively prevent internal leakage of oil and extend the service life of the gear pump. Attached Figure Description

[0016] Figure 1 This is a front view of the gap compensation component according to an embodiment of the present utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of the gap compensation component according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the main crescent plate in an embodiment of this utility model.

[0019] Figure 4 This is a top view of the main crescent plate in an embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the sub-crescent plate structure in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of a bidirectional internal meshing gear pump according to an embodiment of the present invention.

[0022] Figure 7 This is a three-dimensional structural diagram of the bidirectional internal meshing gear pump without the pump body, according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the working state of the bidirectional internal meshing gear pump according to an embodiment of the present invention.

[0024] The following are the labels in the attached diagram: 1. Main crescent plate, 12. Stop groove, 13. High-pressure oil inflow area, 14. Limiting protrusion, 15. Groove area, 2. Secondary crescent plate, 21. Bottom end face of secondary crescent plate, 22. Side end face of secondary crescent plate, 3. Spring, 4. Seal, 5. Groove, 6. Inclined surface, 7. Oil guide cavity, 8. Internal gear ring, 9. External gear, 10. Stop pin, 11. Pump body. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. Example

[0027] like Figure 1-5As shown, this utility model provides a gap compensation component, including a main crescent plate 1, two secondary crescent plates 2, a spring 3, and a seal 4. The main crescent plate 1 has a crescent-shaped, symmetrical structure. A stop groove 12 is provided in the center of the main crescent plate 1 in the axial direction. Along the outer arc side of the main crescent plate 1, a groove area 15, a high-pressure oil inflow area 13, and a limiting protrusion 14 are symmetrically arranged at both ends of the stop groove 12. Figure 3-4 As shown in the dashed box, the groove area 15 has a groove 5, and the high-pressure oil inflow area 13 has an inwardly recessed inclined surface 6 along both ends of the axial direction. Two secondary crescent plates 2 are symmetrically arranged along the central axis of the main crescent plate 1 above the groove area 15 on the outer arc side of the main crescent plate 1 and the high-pressure oil inflow area 13. The bottom end face 21 of the secondary crescent plate 2 contacts the limiting protrusion 14, which is used to hold the secondary crescent plate 2. The connection between the bottom end face 21 of the secondary crescent plate 2 and the side end face 22 of the secondary crescent plate is set as an inwardly recessed trapezoidal shape. The bottom end face 21 of the secondary crescent plate 2 is provided with rounded corners between the outer arc surface and the inner arc surface of the secondary crescent plate, which can make the oil flow faster. The inner arc section of the secondary crescent plate 2 and the inclined surface 6 of the two ends of the axial direction of the high-pressure oil inflow area 13 form an oil guide cavity 7. The seal 4 is positioned on the side of the groove 5 that contacts the secondary crescent plate 2, and the seal 4 is in a sealed fit with both the primary crescent plate 1 and the secondary crescent plate 2. The spring 3 and the seal 4 are abutted within the groove 5, and the spring 3 is installed below the seal 4. The spring 3 is preferably of an arc-shaped structure, and the material of the seal 4 is preferably polyetheretherketone, polyurethane, thermoplastic elastomer, nitrile rubber, aramid fiber reinforced rubber, or rubber-metal composite material; the seal 4 is preferably a cylindrical seal.

[0028] like Figure 6-8 As shown, this utility model provides a bidirectional internal gear pump, including an internal gear ring 8 for internal meshing, an external gear 9 that meshes with a portion of the teeth of the internal gear ring 8, two stop pins 10, and a pump body 11 for mounting the internal gear ring and the external gear. A gradually narrowing annular space is formed between the tooth tip circles of the internal gear ring 8 and the external gear 9. A clearance compensation component is provided in the annular space. The inner arc of the main crescent plate 1 of the clearance compensation component abuts against the outer ring teeth of the external gear 9, and the outer arc of the secondary crescent plate 2 of the clearance compensation component abuts against the inner teeth of the internal gear ring 8. The stop pins 10 are engaged and connected in the stop groove 12.

[0029] like Figure 6-8As shown, the main crescent plate 1 and the secondary crescent plate 2 divide the pump chamber of the bidirectional internal gear pump into an oil suction chamber and an oil discharge chamber, ensuring complete isolation between the two. Depending on the rotation direction of the external gear 9, the oil suction chamber and the oil discharge chamber are interchanged. When the external gear 9 of the bidirectional internal gear pump drives the internal gear ring 8 to rotate, the gears on the oil suction side gradually disengage, causing the inter-tooth volume to expand rapidly. This expansion reduces the pressure in the oil suction chamber to below atmospheric pressure, forming a low-pressure zone. At this time, external hydraulic oil is drawn into the pump chamber under atmospheric pressure, filling the inter-tooth gaps. As the gears continue to rotate, the teeth on the oil discharge side gradually engage, causing the inter-tooth volume to shrink dramatically. This shrinkage raises the pressure in the oil discharge chamber to the system operating pressure, forming a high-pressure zone, where the liquid is squeezed out. In contrast, ordinary gear pumps, due to long-term gear wear, experience increased radial clearance between the gears and the pump body, leading to oil leakage from the high-pressure zone to the low-pressure zone, thus causing internal leakage.

[0030] like Figure 8 As shown, when the external gear 9 rotates counterclockwise, oil enters the internal gear ring 8 within the right dashed box. A low-pressure zone is formed between the external gear 9 and the internal gear ring 8 within the right dashed box, while a high-pressure zone is formed between the external gear 9 and the internal gear ring 8 within the left dashed box. The main crescent plate 1 and the secondary crescent plate 2 within the left dashed box will open under the pressure of the high-pressure zone, causing the inner arc side of the main crescent plate 1 to tightly adhere to the tooth tip of the external gear 9, and the outer arc side of the secondary crescent plate 2 to tightly adhere to the tooth tip of the internal gear ring 8. Figure 8 As indicated by the arrow within the high-pressure zone (dashed box on the left), the oil quickly enters the oil guide chamber 7 along the inclined surface 6 on the main crescent plate 1, then squeezes the seal 4, making the seal 4 fit more tightly with the main crescent plate 1 and the secondary crescent plate 2, forming a good sealing effect. Meanwhile, the force causing the main crescent plate 1 and the secondary crescent plate 2 in the high-pressure zone to open up causes one end of the main crescent plate 1 in the low-pressure zone to tilt upwards and fit more tightly with the secondary crescent plate 2. Simultaneously, this forces the seal 4 in the low-pressure zone to fit more tightly with the main crescent plate 1 and the secondary crescent plate 2, further enhancing the sealing effect. The double sealing provided by the two seals ensures a better sealing effect, effectively preventing oil leakage from the high-pressure zone to the low-pressure zone, thus achieving radial clearance compensation and preventing internal oil leakage.

[0031] Two secondary crescent plates 2 are set to provide radial clearance compensation from both ends of the main crescent plate 1, ensuring uniform force and compensation effect. Therefore, the two secondary crescent plates 2 are symmetrically arranged along the central axis of the main crescent plate 1. The connection between the bottom end face 21 and the side end face 22 of the secondary crescent plate 2 is designed as an inwardly concave trapezoidal shape. The bottom end face 21 of the secondary crescent plate 2 is rounded with fillets between the outer arc surface and the inner arc surface of the secondary crescent plate. The inclined surfaces 6 on both ends of the high-pressure oil inflow area 13 on the main crescent plate 1 also enable faster oil flow, allowing the oil to quickly enter the oil guide cavity 7. This allows the high-pressure areas of the main crescent plate 1 and the secondary crescent plate 2 to open quickly, while the low-pressure areas are tightly fitted, improving the efficiency of radial clearance compensation.

Claims

1. A gap compensation component, characterized in that, It includes a main crescent plate (1), two secondary crescent plates (2), a spring (3), and a seal (4); the main crescent plate (1) has a crescent-shaped symmetrical structure, and a stop groove (12) is provided in the center of the main crescent plate (1) in the axial direction. The outer arc side of the main crescent plate (1) is symmetrically provided with a groove area (15), a high-pressure oil inflow area (13), and a limiting protrusion (14) along the stop groove (12) to both ends. The groove area (15) is provided with a groove (5), and the high-pressure oil inflow area (13) is recessed inward at both ends along the axial direction with a slope (6). The two secondary crescent plates (2) are symmetrically arranged along the central axis of the main crescent plate (1) above the groove area (15) on the outer arc side of the main crescent plate (1) and the high-pressure oil inflow area (13). The bottom end face (21) of the secondary crescent plate (2) contacts the limiting protrusion (14). The connection between the bottom end face (21) of the secondary crescent plate (2) and the side end face (22) of the secondary crescent plate is set as an inwardly concave trapezoidal shape. The bottom end face (21) of the secondary crescent plate (2) is provided with rounded corners between the outer arc surface and the inner arc surface of the secondary crescent plate. The inner arc segment of the secondary crescent plate (2) and the inclined surface (6) of the two ends of the axial direction of the high-pressure oil inflow area (13) form an oil guide cavity (7). The sealing element (4) is disposed on the side of the groove (5) opening and the secondary crescent plate (2) in contact, and the sealing element (4) is sealed and fitted to both the main crescent plate (1) and the secondary crescent plate (2); The spring (3) and the seal (4) are disposed abutting each other in the groove (5), and the spring (3) is installed below the seal (4).

2. The gap compensation component according to claim 1, characterized in that, The material of the sealing element (4) is polyetheretherketone, polyurethane, thermoplastic elastomer, nitrile rubber, aramid fiber reinforced rubber or rubber-metal composite material.

3. The gap compensation component according to claim 1, characterized in that, The sealing element (4) is a cylindrical sealing element.

4. The gap compensation component according to claim 1, characterized in that, The spring piece (3) has an arc-shaped structure.

5. The gap compensation component according to claim 1, characterized in that, The groove (5) is symmetrically arranged along the central axis of the main crescent plate (1).

6. A bidirectional internal gear pump, comprising an internal gear ring (8) for internal engagement, an external gear (9) engaging with a portion of the teeth of the internal gear ring (8), two stop pins (10), and a pump body (11) for mounting the internal gear ring and the external gear, wherein a gradually narrowing annular space is formed between the tooth tip circles of the internal gear ring (8) and the external gear (9), characterized in that, The annular space is provided with a gap compensation component according to any one of claims 1-5. The inner arc of the main crescent plate (1) of the gap compensation component abuts against the outer ring tooth of the external gear (9). The outer arc of the secondary crescent plate (2) of the gap compensation component abuts against the inner tooth of the internal gear ring (8). The stop pin (10) is engaged and connected in the stop groove (12).

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