Radial clearance compensation mechanism of internal gear pump

Abstract

The invention provides a radial clearance compensation mechanism of an internal gear pump, which comprises an internal gear, an external gear and a crescent plate assembly, the crescent plate assembly comprises a main crescent plate and an auxiliary crescent plate, the inner arc section of the main crescent plate abuts against the outer ring teeth of the internal gear, and the outer arc section of the auxiliary crescent plate abuts 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] The invention relates to the technical field of internal gear pumps, in particular to a radial clearance compensation mechanism of an internal gear pump. Background Art

[0002] When the internal gear pump is working, the active internal gear on the main shaft drives the external gear to rotate in the same direction. The gears separate from each other at the inlet to form negative pressure and suck in liquid. The gears are continuously engaged and meshed at the outlet to squeeze the liquid out. However, it is prone to wear due to the accumulation of usage time, and gaps will be generated after wear, thus affecting the working effect of the device.

[0003] The existing internal gear pump with radial clearance compensation function has a complex radial clearance compensation mechanism (crescent plate assembly), large impact when the gear meshes in and out of the crescent plate, high noise, and easy jamming; it has many parts, and the gear pump may fail easily due to failure of the seals, elastic elements and crescent plate on its compensation mechanism. In addition, its installation design is difficult and the economic cost is high.

[0004] In view of this, 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. Summary of the invention

[0005] The main purpose of the present invention 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 has a complex structure and is prone to causing parts to get stuck.

[0006] To achieve the above object, 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 arranged 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 comprises a main crescent plate and a secondary crescent plate, both of which are bent toward the inner gear. The inner arc section of the main crescent plate is disposed against the outer ring teeth of the inner gear, and the outer arc section of the secondary crescent plate is disposed against the inner ring teeth of the outer gear. The outer arc section of the main crescent plate is convexly provided with a synapse, and the inner arc section of the secondary crescent plate is concavely provided with a groove matched with the synapse, and the synapse is connected to the groove.

[0008] The outer arc section of the main crescent plate is recessed inwardly to form an oil guide chamber between the outer arc section of the auxiliary crescent plate and the inner arc section of the auxiliary crescent plate.

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

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

[0011] Preferably, the synapse is in an arc shape, and the groove is matched to be in an arc shape.

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

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

[0014] Preferably, the number of the oil guide chambers is two, and the two oil guide chambers are arranged oppositely on two sides of the outer arc segment of the main crescent plate.

[0015] Preferably, the thickness of the main crescent plate is gradually increased from both ends to the middle.

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

[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 meshing gear pump, comprising an internal gear, an external gear and a crescent plate assembly arranged between the internal gear and the external gear, wherein the internal gear and the external gear are eccentrically meshed with each other, and the crescent plate assembly comprises a main crescent plate and a secondary crescent plate, both of which are bent toward the internal gear, the inner arc segment of the main crescent plate is arranged to abut against the outer ring teeth of the internal gear, the outer arc segment of the secondary crescent plate is arranged to abut against the inner ring teeth of the external gear, the outer arc segment of the main crescent plate is convex to form a synapse, and the inner arc segment of the secondary crescent plate is concave to form a groove matched with the synapse, the synapse is connected to the groove, and the outer arc segment of the main crescent plate is concave inwardly to form an oil guide chamber with the inner arc segment of the secondary crescent plate. In this way, the pressure in the working room causes the oil to pass through the oil guide chamber, so that the crescent plate assembly is forced to open and close to the tooth tops of the inner and outer gears respectively, while the low-pressure side of the auxiliary crescent plate is close to the synaptic part of the main crescent plate to achieve the effect of radial clearance compensation. It abandons the sealing strips, wave springs and other parts in the radial clearance compensation mechanism (crescent plate assembly) of the traditional internal meshing gear pump, avoids the failure of the gear pump caused by the failure of parts such as sealing strips and wave spring sheets, reduces the risk of gear jamming on the crescent plate assembly, reduces the impact and noise when the gear engages in and out of the crescent plate assembly, extends the service life of the pump, is simple to assemble and easy to maintain, and further improves the economy of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a schematic plan view of the overall structure in one embodiment of the present invention;

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

[0022] Figure 3 It 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 the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0024] Description of Figure Numbers:

[0025] 10. Crescent plate assembly; 110. Main crescent plate; 111. Synapse; 112. Oil guide chamber; 120. Sub-crescent plate; 121. Groove; 20. Internal gear; 30. External gear. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0027] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Please see attached Figure 1-3 In one embodiment of the present invention, a radial clearance compensation mechanism of an internal gear pump includes an internal gear 20, an external gear 30, and a crescent plate assembly 10 arranged between the internal gear 20 and the external gear 30, wherein the internal gear 20 and the external gear 30 are arranged eccentrically meshing with each other. First of all, it should be noted that, unlike the internal gear pump with radial clearance compensation function in the prior art, its radial clearance compensation mechanism (crescent plate assembly 10) has a complex structure, large impact when the gear meshes in and out of the crescent plate, high noise, and easy jamming; it has many parts, and it is easy for the gear pump to fail due to the failure of the seals, elastic elements and crescent plates on its compensation mechanism. In addition, its installation design is difficult and the economic cost is high. The present application solves the above-mentioned defects in the prior art by providing a radial clearance compensation mechanism for an internal gear pump, as follows:

[0031] 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 inner arc segment of the main crescent plate 110 is arranged to abut against the outer ring teeth of the internal gear 20, and the outer arc segment of the secondary crescent plate 120 is arranged to abut against the inner ring teeth of the external gear 30. The outer arc segment of the main crescent plate 110 is convexly formed with a synapse 111, and the inner arc segment of the secondary crescent plate 120 is concavely formed with a groove 121 matched with the synapse 111, and the synapse 111 is connected to the groove 121; the outer arc segment of the main crescent plate 110 is concave inwardly to form an oil guide chamber 112 between the inner arc segment of the secondary crescent plate 120.

[0032] Specifically, the radial clearance compensation mechanism of the internal gear pump in the present application includes an internal gear 20, an external gear 30 and a crescent plate assembly 10, wherein the internal gear 20 and the external gear 30 are the gear assembly body of the internal gear pump, and the crescent plate assembly 10 is used to compensate for the radial clearance, so it is arranged 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 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 the radial clearance, and the secondary crescent plate 120 is used to be arranged between the main crescent plate 110 and the external gear 30 to cooperate with the main crescent plate 110.

[0033] Among them, in the structure of the internal gear pump, the internal gear 20 is meshed with the inside of the external gear 30, so the external gear 30 has an inner gear ring, the internal gear 20 has an outer gear ring, and the main crescent plate 110 and the auxiliary crescent plate 120 are both bent toward the internal gear 20, so the inner arc section of the main crescent plate 110 is set against the outer ring teeth of the internal gear 20, and the outer arc section of the auxiliary crescent plate 120 is set against the inner ring teeth of the external gear 30; further, the outer arc section of the main crescent plate 110 is convexly formed with a synapse 111, and in order to facilitate the connection of the synapse 111, the inner arc section of the auxiliary crescent plate 120 is concave to form a groove 121, and the groove 121 is matched with the synapse 111. The matching setting means that the groove 121 can make the synapse 111 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 inwardly, so that the recessed part and the inner arc segment of the auxiliary crescent plate 120 are spaced to form an oil guide chamber 112. The oil guide chamber 112 is used for supplying oil circulation, so it is connected to the inlet and outlet oil chambers of the pump body. When the oil flows in, the pressure makes the oil pass through the oil guide chamber 112 so that the entire crescent plate assembly 10 is respectively close to the tooth tops of the inner and outer gears 30. At the same time, the oil will make the inner side of the auxiliary crescent plate 120 approach and fit closely to the synapse 111 of the main crescent plate 110, exerting an extrusion force on the synapse 111, thereby achieving the effect of radial clearance compensation.

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

[0035] It should be noted that, since the internal gear 20 is engaged and disengaged from both ends of the inner arc section of the main crescent plate 110, this part is set to be inclined (similar to the chamfer setting), please refer to the attached Figure 2 , in order to further improve the stress conditions at both ends of the main crescent plate 110, play a buffering role, thereby reducing the noise and pressure fluctuations when the gears mesh in and out of the crescent plate, and reduce the risk of gear jamming.

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

[0037] It should be noted that, similar to the inner gear 20 and the primary crescent plate 110, the outer gear 30 engages and disengages from both ends of the outer arc segment of the secondary crescent plate 120, so it is also arranged in an inclined shape. For details, please refer to the attached Figure 3 , so as to improve the stress conditions at both ends of the auxiliary crescent plate 120, reduce the noise and pressure fluctuations during meshing, and reduce the risk of gear jamming.

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

[0039] It is worth noting that, since the gears move in the circumferential direction when meshing, setting the synapse 111 in an arc shape can facilitate matching the force mode of the movement mode, so that the force is more uniform when compensating for the radial clearance and the compensation effect is better.

[0040] As 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 the synapse 111 and the groove 121 to have a certain amount of space for movement when they are squeezed and pressed together, thereby improving the adaptability of the device, avoiding damage to components due to excessive squeezing, and extending the life of the device. In this application as a preferred embodiment, 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 actual conditions.

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

[0043] It should be noted that its arrangement in the middle allows the force of squeezing and pressing to be concentrated in the middle, so that the gap compensation effect is more concentrated, and the effect along the radial direction is the best.

[0044] Furthermore, there are two oil guide chambers 112 , and the two oil guide chambers 112 are arranged oppositely on two sides of the outer arc section of the main crescent plate 110 .

[0045] It should be understood that this allows the oil to apply pressure to the middle from both sides at the same time when entering, making the overall force more uniform, avoiding the situation where only one side of the synapse 111 is subjected to force when it is squeezed and pressed tightly, resulting in eccentric force and affecting the compensation effect.

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

[0047] It should be noted that since the required compensation effect is the greatest closer to the middle, the extrusion pressure is greater. Therefore, in order to ensure the strength of the components, the thickness of the main crescent plate 110 in the middle must be the largest, and then gradually decreases toward both sides, thereby forming a structural form in which the thickness of the main crescent plate 110 gradually increases from both ends to the middle.

[0048] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A radial clearance compensation mechanism for an internal gear pump, characterized in that: It includes an internal gear, an external gear and a crescent plate assembly arranged 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 comprises a main crescent plate and a secondary crescent plate, both of which are bent toward the inner gear. The inner arc section of the main crescent plate is disposed against the outer ring teeth of the inner gear, and the outer arc section of the secondary crescent plate is disposed against the inner ring teeth of the outer gear. The outer arc section of the main crescent plate is convexly provided with a synapse, and the inner arc section of the secondary crescent plate is concavely provided with a groove matched with the synapse, and the synapse is connected to the groove. The outer arc section of the main crescent plate is recessed inwardly to form an oil guide chamber between the outer arc section of the auxiliary crescent plate and the inner arc section of the auxiliary crescent plate.

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

4. The radial clearance compensation mechanism of the internal gear pump according to claim 1, characterized in that: The synapse is in an arc shape, and the groove is matched to be in an arc shape.

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 arranged in the middle of the outer arc section of the main crescent plate.

7. The radial clearance compensation mechanism of the internal gear pump according to claim 6, characterized in that: There are two oil guide chambers, which are arranged oppositely on two sides of the outer arc section 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 to 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 3 mm to 5 mm.

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