Low-vibration internal gear pump

Abstract

The utility model provides a low-vibration internal gear pump which comprises a pump body, an external gear and an internal gear and further comprises a crescent plate assembly, the crescent plate assembly comprises a main crescent plate and an auxiliary crescent plate, two first damping groove units are formed in the inner arc section of the main crescent plate, and two second damping groove units are formed in the inner arc section of the auxiliary crescent plate. The width of the first damping groove unit is gradually reduced from the end of the main crescent plate to the middle, two second damping groove units are formed in the outer arc section of the auxiliary crescent plate, and the width of the second damping groove units is gradually reduced from the end of the auxiliary crescent plate to the middle. In this way, oil in the oil inlet cavity firstly passes through the damping groove units to achieve pre-boosting when entering the tooth tip oil cavity, and firstly passes through the damping groove units on the other side to achieve pre-depressurization before the oil gets close to the oil outlet cavity and goes out, so that the pressure of the oil is smoothly transited when the oil enters and goes out of the tooth tip oil cavity, and the situation of fluctuation caused by sudden pressure change is reduced; therefore, the vibration and noise of the gear pump are reduced, the stress condition of the crescent plate is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of internal gear pump technology, and in particular to a low-vibration internal gear pump. Background Technology

[0002] An internal gear pump is a type of pump that operates on the principle of internal gear meshing. It is mainly suitable for conveying materials in industries such as petroleum, chemicals, coatings, dyes, food, oils, and pharmaceuticals.

[0003] In existing internal gear pumps, sudden changes in oil pressure during high-speed rotation lead to vibration, high noise, and large pressure fluctuations, which can affect the NVH performance requirements of the internal gear pump and, with the accumulation of usage time, can easily affect its service life to some extent.

[0004] Therefore, it is necessary to propose a low-vibration internal gear pump to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main objective of this invention is to provide a low-vibration internal gear pump to solve the problem that existing internal gear pumps are prone to sudden oil pressure changes, leading to high vibration and noise.

[0006] To achieve the above objectives, this utility model provides a low-vibration internal gear pump, comprising a pump body, an external gear, and an internal gear. The internal gear and the external gear are internally meshed and rotatably disposed within the pump body. The pump also includes a crescent plate assembly disposed between the internal gear and the external gear.

[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. The secondary crescent plate is disposed between the main crescent plate and the external gear, and the outer arc segment of the secondary crescent plate abuts against the inner ring teeth of the external gear.

[0008] Two first damping groove units are formed on the inner arc segment of the main crescent plate. The two first damping groove units are arranged opposite to each other at both ends of the inner arc segment of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit gradually decreases from the end of the main crescent plate toward the middle.

[0009] Two second damping groove units are formed on the outer arc segment of the sub-lunar plate. The two second damping groove units are arranged opposite each other at both ends of the outer arc segment of the sub-lunar plate along the central axis of the sub-lunar plate, and the width of the second damping groove unit gradually decreases from the end of the sub-lunar plate toward the middle.

[0010] Preferably, each of the first damping groove units includes a plurality of first damping grooves spaced apart along the width direction of the main crescent plate, and each of the second damping groove units includes a plurality of second damping grooves spaced apart along the width direction of the secondary crescent plate.

[0011] Preferably, the length of the first damping groove is greater than the length of the second damping groove.

[0012] Preferably, the cross-sections of both the first damping groove and the second damping groove are acute triangular in shape.

[0013] Preferably, the main crescent plate has inward recesses on both sides along its width direction to form a stop groove for connecting the stop pin, and the middle part of the secondary crescent plate is disconnected to form an installation space for placing the stop pin.

[0014] Preferably, it further includes a gap compensation component, wherein two through slots extending along their own width are provided on the main crescent plate, the two through slots are arranged opposite to each other along the central axis of the main crescent plate, and each through slot is provided with a gap compensation component.

[0015] Preferably, each of the gap compensation components includes a spring and a sealing rubber rod, the spring being connected to the side of the through groove near the internal gear, and the sealing rubber rod being connected between the spring and the secondary crescent plate.

[0016] Preferably, the cross-section of the through groove is triangular.

[0017] Preferably, each first damping groove unit contains two first damping grooves, and each second damping groove unit contains two second damping grooves.

[0018] Preferably, the length of the first damping groove is 10mm to 12mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides a low-vibration internal gear pump, comprising a pump body, an external gear, and an internal gear. The internal gear and the external gear are internally meshed and rotatably disposed within the pump body. It also includes a crescent plate assembly disposed between the internal and external gears. The crescent plate assembly includes a main crescent plate and a secondary crescent plate, both curved towards the internal gear. The inner arc segment of the main crescent plate abuts against the outer ring teeth of the internal gear. The secondary crescent plate is disposed between the main crescent plate and the external gear, and its outer arc segment abuts against the inner ring teeth of the external gear. The main crescent plate has two first damping groove units on its inner arc segment. The two first damping groove units are arranged opposite each other at both ends of the inner arc segment of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit gradually decreases from the end of the main crescent plate toward the middle. The secondary crescent plate has two second damping groove units on its outer arc segment. The two second damping groove units are arranged opposite each other at both ends of the outer arc segment of the secondary crescent plate along the central axis of the secondary crescent plate, and the width of the second damping groove unit gradually decreases from the end of the secondary crescent plate toward the middle. When the oil in the inlet chamber enters the tooth tip oil chamber, it first passes through the damping groove unit to achieve pre-pressure boosting. Before exiting the outlet chamber, the oil also passes through the damping groove unit on the other side for pre-pressure reduction. This ensures a smooth pressure transition when the oil enters and exits the tooth tip oil chamber, reducing pressure fluctuations caused by sudden pressure changes. This reduces vibration and noise of the gear pump, improves the stress on the crescent plate, and extends the service life of the crescent plate and the gear pump. Furthermore, the first damping groove unit and the second damping groove unit are symmetrically arranged, so the pre-pressure boosting and pre-pressure reduction effects of the damping groove can be adaptively changed when the rotation direction of the gear changes, making it highly applicable. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a three-dimensional schematic diagram of the assembly between the crescent plate assembly and the gear in one embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the assembly plane between the crescent plate assembly and the gear in one embodiment of the present utility model;

[0024] Figure 3 This is a perspective view of the crescent plate assembly in one embodiment of the present utility model;

[0025] Figure 4This is a plan view of the crescent plate assembly in one embodiment of the present utility model;

[0026] Figure 5 This is an exploded view of the crescent plate assembly and gear in one embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional schematic diagram of the overall structure in one embodiment of the present utility model;

[0028] Figure 7 This is a cross-sectional schematic diagram of the overall structure in one embodiment of the present invention.

[0029] 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.

[0030] Explanation of icon numbers:

[0031] 10. Crescent plate assembly; 110. Main crescent plate; 111. First damping groove; 112. Stop groove; 113. Clearance compensation assembly; 1131. Spring; 1132. Sealing rubber rod; 114. Through groove; 120. Secondary crescent plate; 121. Second damping groove; 122. Installation space; 20. Internal gear; 30. External gear; 40. Pump body; 410. Stop pin. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Please see the appendix Figure 1-7 This utility model provides a low-vibration internal gear pump in one embodiment, comprising a pump body 40, an external gear 30, and an internal gear 20. The internal gear 20 and the external gear 30 are internally meshed and rotatably disposed within the pump body 40. It also includes a crescent plate assembly 10 disposed between the internal gear 20 and the external gear 30. First, it should be noted that, unlike existing internal gear pumps where sudden oil pressure changes at high speeds lead to pump vibration, high noise, and large pressure fluctuations, thus affecting the NVH (noise, vibration, and harshness) requirements and potentially impacting service life over time, this application addresses these shortcomings by providing a low-vibration internal gear pump, as detailed below:

[0037] 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. The secondary crescent plate 120 is disposed between the main crescent plate 110 and the external gear 30, and the outer arc segment of the secondary crescent plate 120 abuts against the inner ring teeth of the external gear 30. Two first damping groove 111 units are formed on the inner arc segment of the main crescent plate 110, and the two first damping groove 111 units are arranged along the main crescent plate. The central axis of the main crescent plate 110 is positioned opposite to both ends of the inner arc segment of the main crescent plate 110, and the width of the first damping groove 111 unit gradually decreases from the end of the main crescent plate 110 toward the middle; two second damping groove 121 units are formed on the outer arc segment of the secondary crescent plate 120, and the two second damping groove 121 units are positioned opposite to both ends of the outer arc segment of the secondary crescent plate 120 along the central axis of the secondary crescent plate 120, and the width of the second damping groove 121 unit gradually decreases from the end of the secondary crescent plate 120 toward the middle.

[0038] Specifically, the low-vibration internal gear pump of this application includes a pump body 40, an external gear 30, and an internal gear 20. The pump body 40 is the main body of the entire internal gear pump device, and it has an oil inlet chamber and an oil outlet chamber, which are connected to the oil inlet and outlet of the top pump cover. This is a relatively mature technical structure, so it will not be described in detail here. The external gear 30 and the internal gear 20 are internally meshing structures, and they are internally meshed and rotatably disposed in the pump body 40. It also includes a crescent plate assembly 10, which is disposed in the eccentric gap between the external gear 30 and the internal gear 20 to reduce the vibration of the gear pump. The system is partially divided into a high-pressure chamber and a low-pressure chamber, which are connected to the oil outlet chamber and the oil inlet chamber, respectively. The crescent plate assembly 10 includes a main crescent plate 110 and a secondary crescent plate 120, both of which are 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. Thus, the main crescent plate 110 and the secondary crescent plate 120 are disposed between the internal gear 20 and the external gear 30, and the internal gear 20 and the external gear 30 also form tooth tip oil chambers with the main crescent plate 110 and the secondary crescent plate 120, respectively, for oil to flow in.

[0039] The main crescent plate 110 has two first damping groove 111 units arranged opposite each other along its central axis on its inner arc segment. The width of the first damping groove 111 unit gradually decreases from the end of the main crescent plate 110 toward the middle. This allows the oil to pass through the end for pre-pressurization when entering the tooth tip oil cavity between the internal gear 20 and the main crescent plate 110 from the oil inlet cavity. It then passes through the wider first damping groove 111 unit before gradually decreasing in width toward the middle, thus gradually reducing the pressurization space between the first damping groove 111 unit and the internal gear 20 to mitigate the pressure build-up. The pressure gradually increases from the high pressure to the low pressure, allowing the oil to adapt to the pressure change in advance when reaching the high pressure zone. When the gear rotates to the other side, the oil pressure is also pre-reduced in advance. The first damping groove 111 unit gradually increases from the middle to the end, so that the pressure reduction space between the first damping groove 111 unit and the internal gear 20 gradually increases, so as to slowly transition to the low pressure. In this way, the oil is adapted to the low pressure change in advance when reaching the oil outlet chamber. This provides a smooth pressure process for the oil inlet and outlet between the internal gear 20 and the main crescent plate 110, reducing pressure fluctuations and thus reducing the vibration and noise of the gear pump. Similarly, two second damping groove 121 units are formed on the outer arc segment of the secondary crescent plate 120, arranged opposite each other along its own central axis. The width of the first damping groove 111 unit gradually decreases from the end of the main crescent plate 110 toward the middle. In this way, when the oil enters the tooth tip oil cavity between the external gear 30 and the secondary crescent plate 120 from the oil inlet cavity, it passes through the end for pre-pressurization, first passes through the wider second damping groove 121 unit and then gradually decreases toward the middle, so that the pressurization space between the second damping groove 121 unit and the external gear 30 gradually decreases, so as to slow down the pressure increase. The pressure gradually increases, allowing the gear to adapt to the high-pressure changes in advance when reaching the high-pressure zone. When the gear rotates to the other side, the oil pressure is also pre-reduced. The second damping groove 121 unit gradually increases from the middle to the end, increasing the pressure reduction space between the second damping groove 121 unit and the external gear 30, thus gradually transitioning to low pressure. This allows the gear to adapt to the low-pressure changes in advance when reaching the oil outlet chamber, providing a smooth pressure process for the oil inflow and outflow between the external gear 30 and the secondary crescent plate 120, reducing pressure fluctuations, and thus reducing the vibration and noise of the gear pump.

[0040] It is worth mentioning that the two first damping groove units 111 and the two second damping groove units 121 are symmetrically arranged. Thus, when the rotation direction of the gear pump changes, this structure of the present application can still be effective. Since the oil inlet chamber and the oil outlet chamber are exchanged, when oil is introduced from the other side, due to the symmetrical arrangement of the damping grooves, the original pre-pressurization space and pre-depressurization space are also exchanged and can be used directly. This has high adaptability and is suitable for different working conditions. The device has wide applicability.

[0041] In a preferred embodiment of the present invention, each of the first damping groove 111 units includes a plurality of first damping grooves 111 spaced apart along the width direction of the main crescent plate 110, and each of the second damping groove 121 units includes a plurality of second damping grooves 121 spaced apart along the width direction of the secondary crescent plate 120.

[0042] It should be noted that the first damping grooves 111 are spaced apart along the width direction of the main crescent plate 110 so that the pre-pressurization and pre-depressurization space between the internal gear 20 and the main crescent plate 110 is evenly distributed, so as to ensure the effect of smooth pressure transition; similarly, the second damping grooves 121 are spaced apart along the width direction of the secondary crescent plate 120 so that the pre-pressurization and pre-depressurization space between the external gear 30 and the secondary crescent plate 120 is evenly distributed, so as to ensure the effect of smooth pressure transition; in a preferred embodiment of this application, there are two first damping grooves 111 in each first damping groove 111 unit and two second damping grooves 121 in each second damping groove 121 unit. Those skilled in the art can set them according to the actual situation and effect.

[0043] In a preferred embodiment of the present invention, the length of the first damping groove 111 is greater than the length of the second damping groove 121.

[0044] It should be noted that, considering the large pressure fluctuation in the tooth tip oil chamber between the internal gear 20 and the main crescent plate 110, a larger pressure smoothing transition space is required. Therefore, the length of the first damping groove 111 is greater than the length of the second damping groove 121. In a preferred embodiment of this application, the length of the first damping groove 111 can be set to 10mm to 12mm. Its specific length must exceed the length of one tooth of the internal gear. Its specific value can be adjusted according to the gear's adaptability. Those skilled in the art can select it as needed.

[0045] In a preferred embodiment of the present invention, the cross-sections of the first damping groove 111 and the second damping groove 121 are both acute triangular in shape.

[0046] It is worth noting that the acute-angled triangle can have a gradually decreasing width to meet the requirement that the damping groove gradually decreases in width from the end to the middle. Please refer to the appendix for details. Figure 3 .

[0047] In a preferred embodiment of the present invention, the main crescent plate 110 has inward recesses on both sides along its width direction to form stop grooves 112 for connecting the stop pin 410, and the secondary crescent plate 120 is disconnected in the middle to form an installation space 122 for placing the stop pin 410.

[0048] It is worth noting that the stop groove 112 is used for the installation of the stop pin 410. The stop pin 410 is used to fix the crescent plate assembly 10 to prevent the crescent plate assembly 10 from shifting and rotating. Therefore, the middle part of the secondary crescent plate 120 needs to be broken to form two secondary crescent plates that are spaced apart. The space between the two secondary crescent plates is the installation space 122 for the stop pin 410 to be placed.

[0049] Furthermore, it also includes a gap compensation component 113. The main crescent plate 110 has two through slots 114 extending along its own width direction. The two through slots 114 are arranged opposite to each other along the central axis of the main crescent plate 110. Each through slot 114 is provided with a gap compensation component 113.

[0050] It should be noted that due to the cumulative wear of components over time, a gap will be generated between the internal gear 20 and the external gear 30 after wear. The gap compensation component 113 is used to compensate for the gap between the internal gear 20 and the external gear 30 to ensure the effectiveness of the device. The through groove 114 is used for the installation of the gap compensation component 113. Preferably, it can be set in a triangular shape, which facilitates the installation of the spring 1131 and the sealing rubber rod 1132. Under the pressure of the oil, the gap compensation component 113 is used to press against the main crescent plate 110 to apply a compressive force, thereby achieving the effect of gap compensation.

[0051] Furthermore, each of the gap compensation components 113 includes a spring piece 1131 and a sealing rubber rod 1132. The spring piece 1131 is connected to the side of the through groove 114 near the internal gear 20, and the sealing rubber rod 1132 is connected between the spring piece 1131 and the secondary crescent plate 120.

[0052] It should be understood that the sealing rubber rod 1132 is used to prevent oil leakage. After being squeezed and engaged with the spring sheet 1131, it applies an elastic squeezing force to compensate for the gap.

[0053] 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 low-vibration internal gear pump, comprising a pump body, an external gear, and an internal gear, wherein the internal gear and the external gear are internally meshed and rotatably disposed within the pump body, characterized in that, It also includes a crescent plate assembly disposed between the internal gear and the external gear; 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. The secondary crescent plate is disposed between the main crescent plate and the external gear, and the outer arc segment of the secondary crescent plate abuts against the inner ring teeth of the external gear. Two first damping groove units are formed on the inner arc segment of the main crescent plate. The two first damping groove units are arranged opposite to each other at both ends of the inner arc segment of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit gradually decreases from the end of the main crescent plate toward the middle. Two second damping groove units are formed on the outer arc segment of the sub-lunar plate. The two second damping groove units are arranged opposite each other at both ends of the outer arc segment of the sub-lunar plate along the central axis of the sub-lunar plate, and the width of the second damping groove unit gradually decreases from the end of the sub-lunar plate toward the middle.

2. The low-vibration internal gear pump according to claim 1, characterized in that, Each of the first damping groove units includes a plurality of first damping grooves spaced apart along the width direction of the main crescent plate, and each of the second damping groove units includes a plurality of second damping grooves spaced apart along the width direction of the secondary crescent plate.

3. The low-vibration internal gear pump according to claim 2, characterized in that, The length of the first damping groove is greater than the length of the second damping groove.

4. The low-vibration internal gear pump according to claim 3, characterized in that, Both the first damping groove and the second damping groove have acute triangular cross-sections.

5. The low-vibration internal gear pump according to claim 1, characterized in that, The main crescent plate has inward recesses on both sides along its width to form a stop groove for connecting the stop pin, and the middle part of the secondary crescent plate is disconnected to form an installation space for placing the stop pin.

6. The low-vibration internal gear pump according to claim 1, characterized in that, It also includes a gap compensation component. The main crescent plate has two through slots extending along its own width direction. The two through slots are arranged opposite each other along the central axis of the main crescent plate. Each through slot is provided with a gap compensation component.

7. The low-vibration internal gear pump according to claim 6, characterized in that, Each of the aforementioned gap compensation components includes a spring and a sealing rubber rod. The spring is connected to the side of the through groove near the internal gear, and the sealing rubber rod is connected between the spring and the secondary crescent plate.

8. The low-vibration internal gear pump according to claim 7, characterized in that, The cross-section of the through groove is triangular.

9. The low-vibration internal gear pump according to claim 1, characterized in that, Each first damping groove unit contains two first damping grooves, and each second damping groove unit contains two second damping grooves.

10. The low-vibration internal gear pump according to claim 4, characterized in that, The length of the first damping groove is 10mm to 12mm.

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