Radial clearance compensation mechanism of internal gear pump

Abstract

The utility model provides a radial clearance compensation mechanism of an internal gear pump, which comprises an internal gear, an external gear and a crescent plate component, the crescent plate component comprises a main crescent plate and an auxiliary crescent plate, the inner arc section of the main crescent plate is propped against the outer ring teeth of the internal gear, the outer arc section of the auxiliary crescent plate is propped against the inner ring teeth of the external gear, and the outer arc section of the auxiliary crescent plate is propped against the inner ring teeth of the external gear. The outer arc section of the main crescent plate protrudes to form a protrusion, the inner arc section of the auxiliary crescent plate sinks to form a groove, the protrusion is connected into the groove, and the outer arc section of the main crescent plate sinks inwards so that the outer arc section of the main crescent plate and the inner arc section of the auxiliary crescent plate can be spaced to form an oil guide chamber. In this way, oil passes through the oil guide chamber under the pressure of the working chamber, so that the crescent plate assembly is stressed to be opened and tightly attached to the tooth crests of the inner gear and the outer gear respectively, the low-pressure side of the auxiliary crescent plate gets close to and is attached to the synaptic part of the main crescent plate to achieve the radial clearance compensation effect, and impact and noise generated when the gears are meshed in and out of the crescent plate assembly are reduced. The assembly is simple, the maintenance is convenient, and the economical efficiency of products is improved.

Description

Technical Field

[0001] This utility model relates to the field of internal gear pump technology, and in particular to a radial clearance compensation mechanism for an internal gear pump. Background Technology

[0002] When the internal gear pump is working, the driving internal gear on the main shaft drives the inner and outer gears to rotate in the same direction. At the inlet, the gears separate to form a negative pressure and draw in the liquid. At the outlet, the gears continuously engage and mesh to squeeze the liquid out. However, with the accumulation of use time, wear is prone to occur, and after wear, gaps will be generated, which will affect the working effect of the device.

[0003] Existing internal gear pumps with radial clearance compensation function have complex radial clearance compensation mechanisms (crescent plate assemblies). The impact of gears meshing into and out of the crescent plate is large, resulting in high noise and easy jamming. They have many parts, and the failure of the gear pump can easily be caused by the failure of the seals, elastic elements and crescent plates on the compensation mechanism. In addition, their installation design is difficult and the economic cost is high.

[0004] Therefore, it is necessary to propose a radial clearance compensation mechanism for an internal gear pump to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a radial clearance compensation mechanism for an internal gear pump, so as to solve the problem that the clearance compensation mechanism in the prior art is complex in structure and is prone to jamming of parts.

[0006] To achieve the above objectives, this utility model provides a radial clearance compensation mechanism for an internal gear pump, comprising an internal gear, an external gear, and a crescent plate assembly disposed between the internal gear and the external gear, wherein the internal gear and the external gear are eccentrically meshed with each other; wherein,

[0007] The crescent plate assembly includes a main crescent plate and a secondary crescent plate, both curved toward the internal gear. The inner arc segment of the main crescent plate abuts against the outer ring teeth of the internal gear, and the outer arc segment of the secondary crescent plate abuts against the inner ring teeth of the external gear. The outer arc segment of the main crescent plate is provided with a protrusion, and the inner arc segment of the secondary crescent plate is recessed to form a groove that matches the protrusion. The protrusion is connected in the groove.

[0008] The outer arc segment of the main crescent plate is recessed inward to form an oil guide chamber between it and the inner arc segment of the secondary crescent plate.

[0009] Preferably, the inner arc segment of the main crescent plate is inclined near both ends.

[0010] Preferably, the outer arc segment of the secondary crescent plate is inclined near both ends.

[0011] Preferably, the synapse is arc-shaped, and the groove is also arc-shaped.

[0012] Preferably, the arc width of the groove is greater than the arc width of the synapse.

[0013] Preferably, the synapse is located in the middle of the outer arc segment of the main crescent plate.

[0014] Preferably, there are two oil guiding chambers, which are arranged opposite to each other on both sides of the outer arc segment of the main crescent plate.

[0015] Preferably, the thickness of the main crescent plate gradually increases from both ends toward the middle.

[0016] Preferably, the arc width of the groove is 3mm to 5mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a radial clearance compensation mechanism for an internal gear pump, comprising an internal gear, an external gear, and a crescent plate assembly disposed between the internal gear and the external gear. The internal gear and the external gear are eccentrically meshed. The crescent plate assembly includes a main crescent plate and a secondary crescent plate, both curved toward the internal gear. The inner arc segment of the main crescent plate abuts against the outer ring teeth of the internal gear, and the outer arc segment of the secondary crescent plate abuts against the inner ring teeth of the external gear. The outer arc segment of the main crescent plate protrudes to form a protrusion, and the inner arc segment of the secondary crescent plate is recessed to form a groove that matches the protrusion. The protrusion is connected in the groove. The outer arc segment of the main crescent plate is recessed inward to form an oil guide chamber with the inner arc segment of the secondary crescent plate. In this way, the pressure in the working chamber forces the oil through the guide chamber, causing the crescent plate assembly to open and tightly adhere to the tooth tips of the inner and outer gears. Meanwhile, the low-pressure side of the auxiliary crescent plate moves closer to the protrusion of the main crescent plate to achieve radial clearance compensation. This eliminates the need for sealing strips, wave springs, and other parts in the radial clearance compensation mechanism (crescent plate assembly) of traditional internal gear pumps, avoiding gear pump failure caused by the failure of sealing strips, wave springs, and other parts. It also reduces the risk of gear jamming on the crescent plate assembly, reduces the impact and noise when the gears mesh and disengage on the crescent plate assembly, extends the service life of the pump, and is easy to assemble and maintain, further improving the product's economic efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a plan view of the overall structure in one embodiment of the present utility model;

[0021] Figure 2 This is an enlarged schematic diagram of the end of the main crescent plate in one embodiment of the present invention;

[0022] Figure 3 This is an enlarged schematic diagram of the end of the secondary crescent plate in one embodiment of the present invention.

[0023] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] Explanation of icon numbers:

[0025] 10. Crescent plate assembly; 110. Main crescent plate; 111. Synapse; 112. Oil guide chamber; 120. Secondary crescent plate; 121. Groove; 20. Internal gear; 30. External gear. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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 indicator will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] Please see the appendix Figure 1-3 This utility model provides a radial clearance compensation mechanism for an internal gear pump, comprising an internal gear 20, an external gear 30, and a crescent plate assembly 10 disposed between the internal gear 20 and the external gear 30, wherein the internal gear 20 and the external gear 30 are eccentrically meshed. First, it should be noted that, unlike existing internal gear pumps with radial clearance compensation functions, their radial clearance compensation mechanism (crescent plate assembly 10) has a complex structure, generates significant impact, high noise, and is prone to jamming when the gears mesh and disengage on the crescent plate; it also has many components, making it susceptible to pump failure due to the failure of seals, elastic elements, and the crescent plate itself; furthermore, its installation design is difficult and costly. This application addresses the above-mentioned deficiencies in the prior art by providing a radial clearance compensation mechanism for an internal gear pump, as detailed below:

[0031] The crescent plate assembly 10 includes a main crescent plate 110 and a secondary crescent plate 120, both curved toward the internal gear 20. The inner arc segment of the main crescent plate 110 abuts against the outer ring teeth of the internal gear 20, and the outer arc segment of the secondary crescent plate 120 abuts against the inner ring teeth of the external gear 30. The outer arc segment of the main crescent plate 110 protrudes to form a protrusion 111, and the inner arc segment of the secondary crescent plate 120 is recessed to form a groove 121 that matches the protrusion 111. The protrusion 111 is connected in the groove 121. The outer arc segment of the main crescent plate 110 is recessed inward to form an oil guide chamber 112 between it and the inner arc segment of the secondary crescent plate 120.

[0032] Specifically, the radial clearance compensation mechanism of the internal gear pump in this application includes an internal gear 20, an external gear 30, and a crescent plate assembly 10. The internal gear 20 and the external gear 30 are the gear assembly bodies of the internal gear pump. The crescent plate assembly 10 is used to compensate for radial clearance, and therefore it is disposed between the internal gear 20 and the external gear 30. Preferably, the crescent plate assembly 10 includes a main crescent plate 110 and a secondary crescent plate 120, both of which are bent toward the internal gear 20. The main crescent plate 110 is used to abut against the internal gear 20 as a pressure body for compensating for radial clearance. The secondary crescent plate 120 is disposed between the main crescent plate 110 and the external gear 30 to cooperate with the main crescent plate 110.

[0033] In the structure of the internal gear pump, the internal gear 20 meshes inside the external gear 30. Therefore, the external gear 30 has an internal gear ring, and the internal gear 20 has an external gear ring. Both the main crescent plate 110 and the secondary crescent plate 120 are curved towards the internal gear 20. Thus, the inner arc segment of the main crescent plate 110 abuts against the outer ring teeth of the internal gear 20, while the outer arc segment of the secondary crescent plate 120 abuts against the inner ring teeth of the external gear 30. Furthermore, the outer arc segment of the main crescent plate 110 protrudes to form a protrusion 111. To facilitate the connection of the protrusion 111, the inner arc segment of the secondary crescent plate 120 is recessed to form a groove 121, which matches the protrusion 111. The matching setting means that the groove 121 allows the protrusion 111 to be placed and installed in the groove 121, thereby completing the installation of the radial clearance compensation mechanism. At the same time, the outer arc segment of the main crescent plate 110 is also recessed inward, so that the recessed part and the inner arc segment of the secondary crescent plate 120 form an oil guide chamber 112. The oil guide chamber 112 is used to supply oil flow, so it is connected to the inlet and outlet oil chambers of the pump body. When the oil flows in, the pressure causes the oil to pass through the oil guide chamber 112, so that the entire crescent plate assembly 10 is tightly attached to the tooth tops of the inner and outer gears 30 respectively. At the same time, the oil will cause the inner side of the secondary crescent plate 120 to move closer to and tightly attach to the protrusion 111 of the main crescent plate 110, applying a squeezing force to the protrusion 111, thereby achieving the effect of radial clearance compensation.

[0034] In a preferred embodiment of the present invention, the inner arc segment of the main crescent plate 110 is inclined near both ends.

[0035] It should be noted that since the internal gear 20 engages and disengages from both ends of the inner arc segment of the main crescent plate 110, this part is set in an inclined shape (similar to the chamfer setting). Please refer to the appendix for details. Figure 2This further improves the stress distribution at both ends of the main crescent plate 110, acting as a buffer to reduce noise and pressure fluctuations when the gear engages and disengages on the crescent plate, and also reduces the risk of gear jamming.

[0036] In a preferred embodiment of the present invention, the outer arc segment of the secondary crescent plate 120 is inclined near both ends.

[0037] It should be noted that, similar to the internal gear 20 and the main crescent plate 110, the external gear 30 engages and disengages from both ends of the outer arc segment of the secondary crescent plate 120, and is therefore also inclined. Please refer to the appendix for details. Figure 3 This improves the stress distribution at both ends of the secondary crescent plate 120, reduces noise and pressure fluctuations during engagement and disengagement, and reduces the risk of gear jamming.

[0038] In a preferred embodiment of the present invention, the synapse 111 is arc-shaped, and the groove 121 is matched and arranged in an arc shape.

[0039] It is worth noting that since the gear moves circumferentially when meshing in and out, setting the synapse 111 to an arc shape can facilitate matching the force mode of the movement, making the force more uniform and the compensation effect better when compensating for radial clearance.

[0040] In a preferred embodiment of the present invention, the arc width of the groove 121 is greater than the arc width of the synapse 111.

[0041] It is worth noting that this allows for a certain amount of movement between the protrusion 111 and the groove 121 when they are pressed tightly together, which improves the adaptability of the device, avoids damage to components due to excessive compression, and extends the life of the device. In a preferred embodiment of this application, the arc width of the groove 121 can be set to 3mm to 5mm, and those skilled in the art can set it according to the actual situation.

[0042] Furthermore, the synapse 111 is disposed in the middle of the outer arc segment of the main crescent plate 110.

[0043] It should be noted that its placement in the middle allows the force of compression to be concentrated in the middle, thus making the gap compensation effect more concentrated, and the radial effect is the best.

[0044] Furthermore, there are two oil guide chambers 112, which are arranged opposite to each other on both sides of the outer arc segment of the main crescent plate 110.

[0045] It should be understood that this allows the oil to apply pressure from both sides to the center simultaneously when it enters, resulting in a more uniform overall force distribution. This avoids the situation where only one side is subjected to force when the synapse 111 is squeezed and pressed tightly, which would lead to eccentric force distribution and affect the compensation effect.

[0046] Furthermore, the thickness of the main crescent plate 110 is gradually increased from both ends toward the middle.

[0047] It should be noted that since the compensation effect required is the greatest and the compressive force is the greatest closer to the center, in order to ensure the strength of the components, the thickness of the main crescent plate 110 in the middle needs to be the greatest, and then it can gradually decrease towards both sides, thus forming a structure in which the thickness of the main crescent plate 110 gradually increases from both ends to the middle.

[0048] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A radial clearance compensation mechanism for an internal gear pump, characterized in that, The assembly includes an internal gear, an external gear, and a crescent-shaped plate assembly disposed between the internal gear and the external gear, wherein the internal gear and the external gear are eccentrically meshed with each other; wherein... The crescent plate assembly includes a main crescent plate and a secondary crescent plate, both curved toward the internal gear. The inner arc segment of the main crescent plate abuts against the outer ring teeth of the internal gear, and the outer arc segment of the secondary crescent plate abuts against the inner ring teeth of the external gear. The outer arc segment of the main crescent plate is provided with a protrusion, and the inner arc segment of the secondary crescent plate is recessed to form a groove that matches the protrusion. The protrusion is connected in the groove. The outer arc segment of the main crescent plate is recessed inward to form an oil guide chamber between it and the inner arc segment of the secondary crescent plate.

2. The radial clearance compensation mechanism of the internal gear pump according to claim 1, characterized in that, The inner arc segment of the main crescent plate is inclined near both ends.

3. The radial clearance compensation mechanism of the internal gear pump according to claim 2, characterized in that, The outer arc segment of the secondary crescent plate is inclined near both ends.

4. The radial clearance compensation mechanism of the internal gear pump according to claim 1, characterized in that, The synapse is arc-shaped, and the groove is also arc-shaped.

5. The radial clearance compensation mechanism of the internal gear pump according to claim 4, characterized in that, The arc width of the groove is greater than the arc width of the synapse.

6. The radial clearance compensation mechanism of the internal gear pump according to claim 1, characterized in that, The synapse is located in the middle of the outer arc segment of the main crescent plate.

7. The radial clearance compensation mechanism of the internal gear pump according to claim 6, characterized in that, The number of oil guiding chambers is two, and the two oil guiding chambers are arranged opposite to each other on both sides of the outer arc segment of the main crescent plate.

8. The radial clearance compensation mechanism of the internal gear pump according to claim 7, characterized in that, The thickness of the main crescent plate gradually increases from both ends toward the middle.

9. The radial clearance compensation mechanism of the internal gear pump according to claim 5, characterized in that, The arc width of the groove is 3mm to 5mm.

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