Low-vibration internal gear pump

Abstract

The invention provides a low-vibration internal gear pump which comprises a pump body, an outer gear and an inner gear and further comprises a crescent plate assembly, the crescent plate assembly comprises a main crescent plate and an auxiliary crescent plate, and two first damping groove units are formed in the inner arc section of the main 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] The invention relates to the technical field of internal gear pumps, in particular to a low-vibration internal gear pump. Background Art

[0002] The internal gear pump is a pump that works on the principle of internal gear meshing. It is mainly used in industries such as petroleum, chemicals, coatings, dyes, food, grease, and medicine.

[0003] In the prior art, the internal gear pump in the high-speed rotation has a sudden change in oil pressure, which causes the gear pump to vibrate, make loud noises, and experience large pressure fluctuations. This will affect the NVH requirements of the internal gear pump and will easily affect its service life to a certain extent as the use time accumulates.

[0004] In view of this, it is necessary to propose a low-vibration 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 low-vibration internal gear pump to solve the problem that the internal gear pump in the prior art is prone to sudden oil pressure changes resulting in large vibration and noise.

[0006] To achieve the above object, the present invention provides 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 both are rotatably arranged in the pump body, and further comprising a crescent plate assembly, wherein the crescent plate assembly is arranged between the internal gear and the external gear; 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, the secondary crescent plate is disposed between the main crescent plate and the outer gear, and the outer arc section of the secondary crescent plate is disposed against the inner ring teeth of the outer gear;

[0008] Two first damping groove units are provided on the inner arc section of the main crescent plate, and the two first damping groove units are arranged at two ends of the inner arc section of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit is gradually reduced from the end of the main crescent plate toward the middle;

[0009] Two second damping groove units are provided on the outer arc section of the secondary crescent plate, and the two second damping groove units are arranged at two ends of the outer arc section of the secondary crescent plate along the central axis of the secondary crescent plate, and the width of the second damping groove unit is gradually reduced from the end of the secondary crescent 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 primary 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 the first damping groove and the second damping groove are both in the shape of an acute-angle triangle.

[0013] Preferably, the middle part of the main crescent plate is recessed inwards on both sides along its width direction to form a stop groove for connection with a 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, a gap compensation component is further included, and the main crescent plate is provided with two through slots extending along its width direction, the two through slots are arranged opposite to each other along the central axis of the main crescent plate, and a gap compensation component is arranged in each through slot.

[0015] Preferably, each of the clearance compensation components comprises a spring sheet and a sealing rubber rod, wherein the spring sheet is connected to one side of the through slot close to the internal gear, and the sealing rubber rod is connected between the spring sheet and the auxiliary crescent plate.

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

[0017] Preferably, the number of the first damping grooves in each of the first damping groove units is two, and the number of the second damping grooves in each of the second damping groove units is two.

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

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

[0020] A low-vibration internal gear pump provided by the present invention comprises a pump body, an external gear and an internal gear, wherein the internal gear and the external gear are internally meshed and both are rotatably arranged in the pump body, and further comprises a crescent plate assembly, wherein the crescent plate assembly is arranged between the internal gear and the external gear, wherein the crescent plate assembly comprises a main crescent plate and a secondary crescent plate, both of which are bent toward the internal gear, wherein the inner arc segment of the main crescent plate is arranged to abut against the outer ring teeth of the internal gear, and the secondary crescent plate is arranged between the main crescent plate and the external gear, and the outer arc segment of the secondary crescent plate is arranged to abut against the inner ring teeth of the external gear. The main crescent plate is provided with two first damping groove units on its inner arc section, the two first damping groove units are relatively arranged at two ends of the inner arc section of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit is gradually reduced from the end of the main crescent plate toward the middle, and the secondary crescent plate is provided with two second damping groove units on its outer arc section, the two second damping groove units are relatively arranged at two ends of the outer arc section of the secondary crescent plate along the central axis of the secondary crescent plate, and the width of the second damping groove unit is gradually reduced from the end of the secondary crescent plate toward the middle. In this way, when the oil in the oil inlet chamber enters the tooth tip oil chamber, it first passes through the damping groove unit to achieve pre-pressure increase. When the oil approaches the oil outlet chamber, it also passes through the damping groove unit on the other side for pre-pressure reduction before going out, so that the pressure of the oil enters and exits the tooth tip oil chamber smoothly, reducing the fluctuation caused by sudden pressure change, thereby reducing the vibration and noise of the gear pump, improving the stress condition of the crescent plate, and increasing the service life of the crescent plate and the gear pump; and the first damping groove units and the second damping groove units are symmetrically arranged, so when the rotation direction of the gear changes, the pre-pressure increase and pre-pressure reduction effects of the damping groove can also be adaptively changed, which has high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

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

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

[0024] Figure 3 is a three-dimensional schematic diagram of a crescent plate assembly in one embodiment of the present invention;

[0025] Figure 4 is a schematic plan view of a crescent plate assembly in one embodiment of the present invention;

[0026] Figure 5 It is an exploded schematic diagram between the crescent plate assembly and the gear in one embodiment of the present invention;

[0027] Figure 6 It is a three-dimensional schematic diagram of the overall structure of one embodiment of the present invention;

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

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0030] Description of Figure Numbers:

[0031] 10. Crescent plate assembly; 110. Main crescent plate; 111. First damping groove; 112. Stop groove; 113. Clearance compensation assembly; 1131. Spring piece; 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 DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Please see attached Figure 1-7 In one embodiment of the present invention, a low-vibration internal gear pump is provided, including a pump body 40, an external gear 30 and an internal gear 20, wherein the internal gear 20 and the external gear 30 are internally meshed and both are rotatably arranged in the pump body 40, and further comprising a crescent assembly 10, wherein the crescent assembly 10 is arranged between the internal gear 20 and the external gear 30. First of all, it should be noted that, unlike the internal gear pump in the prior art, the sudden change of oil pressure under high-speed rotation causes the gear pump to vibrate, make loud noise, and have large pressure fluctuations, which will affect the NVH requirements of the internal gear pump, and its service life will be easily affected to a certain extent as the use time accumulates. The present application solves the above-mentioned defects in the prior art by providing a low-vibration internal gear pump, as follows:

[0037] The crescent plate assembly 10 includes a main crescent plate 110 and a secondary crescent plate 120, both of which are bent toward the inner gear 20. The inner arc section of the main crescent plate 110 is arranged to abut against the outer ring teeth of the inner gear 20. The secondary crescent plate 120 is arranged between the main crescent plate 110 and the outer gear 30, and the outer arc section of the secondary crescent plate 120 is arranged to abut against the inner ring teeth of the outer gear 30. Two first damping grooves 111 units are provided on the inner arc section of the main crescent plate 110. The two first damping grooves 111 units are arranged along the main crescent plate The central axis of the secondary crescent plate 110 is relatively arranged at the two ends of the inner arc section of the primary crescent plate 110, and the width of the first damping groove 111 unit is gradually reduced from the end of the primary crescent plate 110 toward the middle; the outer arc section of the secondary crescent plate 120 is provided with two second damping groove 121 units, and the two second damping groove 121 units are relatively arranged at the two ends of the outer arc section 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 is gradually reduced from the end of the secondary crescent plate 120 toward the middle.

[0038] Specifically, the low-vibration internal gear pump in the present 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, which has an oil inlet chamber and an oil outlet chamber, which are connected to the oil inlet and oil outlet of the top pump cover. It is a relatively mature technical structure, so it is not described in detail here. The external gear 30 and the internal gear 20 are internally meshed structures, and the two are internally meshed and rotatably arranged in the pump body 40; and it also includes a crescent plate assembly 10, which is arranged in the eccentric gap between the external gear 30 and the internal gear 20 to adjust the gear pump internal gear. The part is divided into a high-pressure chamber and a low-pressure chamber, which are respectively connected to the oil outlet chamber and the oil inlet chamber, wherein the crescent plate assembly 10 includes a main crescent plate 110 and a secondary crescent plate 120 both bent toward the inner gear 20, the inner arc section of the main crescent plate 110 is abutted against the outer ring teeth of the inner gear 20, and the outer arc section of the secondary crescent plate 120 is abutted against the inner ring teeth of the outer gear 30, so that the main crescent plate 110 and the secondary crescent plate 120 are arranged between the inner gear 20 and the outer gear 30, and the inner gear 20 and the outer gear 30 also form a tooth tip oil chamber with the main crescent plate 110 and the secondary crescent plate 120 respectively, for oil to flow in.

[0039] Among them, two first damping grooves 111 units are arranged opposite to each other along the central axis of the main crescent plate 110 on the inner arc section, and the width of the first damping groove 111 unit is gradually reduced from the end of the main crescent plate 110 toward the middle, so that when the oil enters the tooth tip oil chamber between the internal gear 20 and the main crescent plate 110 from the oil inlet chamber, it passes through the end to perform pre-boosting, first passes through the first damping groove 111 unit with a larger width and then gradually decreases toward the middle, so that the boost space between the first damping groove 111 unit and the internal gear 20 is gradually reduced to alleviate the pressure. Slowly transition to high pressure, so that when reaching the high pressure area, it can adapt to the change of high pressure in advance, and when the gear rotates to the other side, the oil is also pre-depressurized in advance, and the first damping groove 111 unit gradually becomes larger 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 low pressure, so that when reaching the oil outlet cavity, it can adapt to the change of low pressure in advance, thereby providing a smooth pressure process for the oil in and out between the internal gear 20 and the main crescent plate 110, reducing pressure fluctuations, thereby reducing the vibration and noise of the gear pump; Similarly, two second damping grooves 121 units are arranged opposite to each other along the central axis of the secondary crescent plate 120 on the outer arc segment, and the width of the first damping groove 111 unit is gradually reduced from the end of the primary crescent plate 110 toward the middle, so that when the oil enters the tooth tip oil chamber between the external gear 30 and the secondary crescent plate 120 from the oil inlet chamber, it passes through the end to perform pre-boosting, first passes through the second damping groove 121 unit with a larger width and then gradually decreases toward the middle, so that the boost space between the second damping groove 121 unit and the external gear 30 is gradually reduced to ease the The gear 120 is rotated to the other side of the gear 120, and the second damping groove 121 unit gradually increases from the middle to the end, so that the pressure reduction space between the second damping groove 121 unit and the outer gear 30 gradually increases, so as to slowly transition to low pressure, so as to adapt to the change of low pressure in advance when reaching the oil outlet chamber, thereby providing a smooth pressure process for the oil in and out of the outer gear 30 and the auxiliary 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 111 units and the two second damping groove 121 units are symmetrically arranged, so when the rotation direction of the gear pump changes, the 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-boost space and pre-depressurization space are also exchanged with each other and can be used directly. This has high adaptability, is suitable for different working conditions, and the device has a wide range of applicability.

[0041] As a preferred embodiment of the present invention, each of the first damping groove 111 units includes a plurality of first damping grooves 111 arranged at intervals 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 arranged at intervals along the width direction of the secondary crescent plate 120.

[0042] It should be noted that the first damping grooves 111 are arranged at intervals along the width direction of the main crescent plate 110 so that the pre-boost and pre-pressure reduction spaces between the inner gear 20 and the main crescent plate 110 are evenly distributed to ensure the effect of smooth pressure transition; similarly, the second damping grooves 121 are arranged at intervals along the width direction of the auxiliary crescent plate 120 so that the pre-boost and pre-pressure reduction spaces between the outer gear 30 and the auxiliary crescent plate 120 are evenly distributed to ensure the effect of smooth pressure transition; in the present application as a preferred embodiment, the number of the first damping grooves 111 in each of the first damping groove 111 units is two, and the number of the second damping grooves 121 in each of the second damping groove 121 units is also two, and those skilled in the art can set them according to actual conditions and effects.

[0043] As 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 that the pressure fluctuation in the tooth tip oil chamber between the internal gear 20 and the main crescent plate 110 is large, a larger pressure smooth transition space is required, so the length of the first damping groove 111 is greater than the length of the second damping groove 121. In the present application as a preferred embodiment, the length of the first damping groove 111 can be set to 10mm~12mm, and its specific length needs to exceed the length of one tooth of the internal gear. Its specific value can be changed according to the adaptability of the gear, and technical personnel in this field can choose according to their needs.

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

[0046] It is worth noting that the acute triangle can present a structural form with gradually decreasing width to meet the requirement that the width of the damping groove gradually decreases from the end to the middle. For details, please refer to the attached Figure 3 .

[0047] As a preferred embodiment of the present invention, the middle part of the main crescent plate 110 is recessed inward on both sides along its width direction to form a stop groove 112 for connecting the stop pin 410, and the middle part of the secondary crescent plate 120 is disconnected 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 installing the stop pin 410, and the stop pin 410 is used to fix the crescent plate assembly 10 to prevent the crescent plate assembly 10 from being offset and rotated. Therefore, the middle part of the secondary crescent plate 120 needs to be disconnected to form two spaced-apart secondary crescent sub-plates, and the spacing space between the two secondary crescent sub-plates is the installation space 122 for placing the stop pin 410.

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

[0050] It should be noted that due to the accumulation of usage time, parts will cause wear, and after wear, a gap will be generated between the inner gear 20 and the outer gear 30. The gap compensation component 113 is used to compensate for the gap between the inner gear 20 and the outer gear 30 to ensure the effect of the device, and the through groove 114 is used for the installation of the gap compensation component 113, preferably it can be set in a triangular shape, so that it is convenient to install the spring piece 1131 and the sealing rubber rod 1132, so that under the pressure of the oil, through the gap compensation component 113 to fit tightly against the main crescent plate 110 to apply an extrusion force, thereby achieving the effect of gap compensation.

[0051] Furthermore, each of the clearance compensation components 113 includes a spring piece 1131 and a sealing rubber rod 1132 . The spring piece 1131 is connected to one side of the through slot 114 close to 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, and after being squeezed and matched with the spring piece 1131, it exerts an elastic squeezing force to play a role in gap compensation.

[0053] 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 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 arranged in the pump body, characterized in that: It also includes a crescent plate assembly, which is arranged between the inner gear and the outer gear; 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, the secondary crescent plate is disposed between the main crescent plate and the outer gear, and the outer arc section of the secondary crescent plate is disposed against the inner ring teeth of the outer gear; Two first damping groove units are provided on the inner arc section of the main crescent plate, and the two first damping groove units are arranged at two ends of the inner arc section of the main crescent plate along the central axis of the main crescent plate, and the width of the first damping groove unit is gradually reduced from the end of the main crescent plate toward the middle; Two second damping groove units are provided on the outer arc section of the secondary crescent plate, and the two second damping groove units are arranged at two ends of the outer arc section of the secondary crescent plate along the central axis of the secondary crescent plate, and the width of the second damping groove unit is gradually reduced from the end of the secondary crescent 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 arranged at intervals along the width direction of the main crescent plate, and each of the second damping groove units includes a plurality of second damping grooves arranged at intervals 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: The cross sections of the first damping groove and the second damping groove are both in the shape of an acute triangle.

5. The low vibration internal gear pump according to claim 1, characterized in that: The middle part of the main crescent plate is recessed inwardly on both sides along its width direction to form a stop groove for connection with a stop pin, and the middle part of the auxiliary 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 is provided with two through slots extending along its width direction. The two through slots are arranged opposite to each other along the central axis of the main crescent plate, and a gap compensation component is arranged in each through slot.

7. The low vibration internal gear pump according to claim 6, characterized in that: Each of the clearance compensation components comprises a spring sheet and a sealing rubber rod. The spring sheet is connected to one side of the through slot close to the internal gear, and the sealing rubber rod is connected between the spring sheet and the auxiliary 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: The number of the first damping grooves in each of the first damping groove units is two, and the number of the second damping grooves in each of the second damping groove units is two.

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

Images