A servo energy-saving internal rotating gear pump

Abstract

The present invention discloses a servo energy-saving internal rotating gear pump, comprising a pump body, a front cover arranged at the front end of the pump body and a rear cover arranged at the rear end of the pump body, the front cover having an oil inlet and an oil inlet channel, when the fluid is sucked into the pump body chamber from the oil inlet and through the oil inlet channel, or when the high-pressure fluid discharged from the pump body chamber through the oil outlet channel reaches the oil outlet, it is not necessary to pass through the through hole on the inner gear ring, and no turbulent flow obstruction will be formed, the fluid output from the oil outlet is the oil outlet channel, which guides the high-pressure fluid flowing out of the pump body chamber into the oil outlet in a direction parallel to the axial direction of the outer gear shaft, and the high-pressure fluid formed by the pressure can pass through the side wall of the pump body chamber and through the oil outlet channel and the oil outlet to flow out in large quantities and quickly, and can stably output the pressure and flow of the fluid, especially at high pressure and low speed, thereby improving the superior performance of the servo energy-saving pump at high pressure and low speed.

Description

Technical Field

[0001] The invention relates to the technical field of pump equipment, and in particular to a servo energy-saving inner-rotating gear pump. Background Art

[0002] Patent authorization publication number CN203627218U discloses an internal rotating gear pump, which utilizes a spindle to drive a gear shaft in a pump body, and then utilizes the partial meshing relationship between the gear shaft and the inner gear ring to drive the inner gear ring to rotate synchronously. During the rotation of the two, the fluid (such as hydraulic oil) can be sucked into the chamber of the pump body from the oil inlet, and then the pressurized fluid can be discharged out of the chamber from the oil outlet. However, the inner wall surface of the chamber of this internal rotating gear pump is concavely provided with a high-pressure oil groove, and a plurality of through holes are provided on the circumferential surface of the inner gear ring, and a pressure retainer is used to divide the chamber into high-pressure and low-pressure chambers. The oil inlet and oil outlet of the internal rotating gear pump are both arranged on the inner wall of the chamber of the pump body, and the oil inlet and oil outlet are both arranged in a manner directly facing the spindle. When After the fluid enters the chamber from the oil inlet, it must first pass through the through holes on the inner gear ring and the low-pressure areas on both sides of the gear ring from the low-pressure area near the oil inlet to the inner gear ring, and then enter the inner gear ring from the inside of the inner gear ring to the outside to enter the high-pressure area formed between the outer side of the inner gear ring and the oil tank, and finally flow out to the oil outlet. Because the oil outlet is located in the radial direction of the spindle, the fluid needs to pass through the through holes provided on the circumference of the inner gear ring twice to enter and exit the gear pump. The through holes are prone to form turbulent obstructions, and when the inner gear ring rotates, if impurities are mixed in the chamber of the pump body, it is easy to cause scratches on the pressure barrier area of ​​the inner wall of the high-pressure chamber, resulting in the problem that the pressure of the fluid in the output fluid oil pump cannot be increased in the high-pressure oil tank and the fluid flow is lost, thereby losing the function of the oil pump. This kind of internal rotating gear pump fails and the fluid delivery is not smooth. Summary of the invention

[0003] In view of this, a servo energy-saving internal rotating gear pump is provided. The technical problem to be solved by the present invention is: how to improve the smoothness of the servo energy-saving internal rotating gear pump in conveying fluid.

[0004] In order to solve the above problems and achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A servo energy-saving inner-rotating gear pump, comprising:

[0006] A pump body;

[0007] A front cover disposed at the front end of the pump body and a rear cover disposed at the rear end of the pump body;

[0008] An inner gear ring disposed in the chamber of the pump body and an outer gear shaft partially meshed with the inner gear ring, a pressure retainer being disposed between the inner gear ring and the outer gear shaft;

[0009] The front cover has an oil inlet and an oil inlet passage, the oil inlet is connected to the outer end surface of the front cover, the oil inlet is connected to the oil inlet passage, the oil inlet passage is connected to the pump body chamber, and the oil inlet passage is used to introduce the fluid entering from the oil inlet into the pump body chamber in a direction parallel to the axial direction of the external gear shaft;

[0010] The rear cover has an oil outlet and an oil outlet channel. The oil outlet is connected to the outer end surface of the rear cover, the oil outlet is connected to the oil outlet channel, the oil outlet channel is connected to the pump body chamber, and the oil outlet channel is used to introduce the high-pressure fluid flowing out of the pump body chamber into the oil outlet in a direction parallel to the axial direction of the external gear shaft.

[0011] Preferably, the pressure retainer comprises:

[0012] A crescent-shaped pressure-maintaining main sheet and an arc-shaped pressure-maintaining auxiliary sheet;

[0013] The pressure-maintaining positive film includes a first semi-crescent portion and a second semi-crescent portion;

[0014] The outer peripheral surface of the second semi-crescent portion is provided with a receiving groove, the pressure-maintaining sub-sheet is placed in the receiving groove, the gap between the bottom of the receiving groove and the pressure-maintaining sub-sheet forms a pressure-conducting cavity, and the groove wall of the receiving groove adjacent to the first semi-crescent portion forms a blocking portion for blocking the pressure-maintaining sub-sheet;

[0015] The bottom of the receiving groove is provided with a first elastic sheet groove and a second elastic sheet groove;

[0016] A first spring sheet is arranged in the first spring sheet groove, a second spring sheet and a pressure-maintaining rod are arranged in the second spring sheet groove, the first spring sheet abuts against the pressure-maintaining sub-sheet, the second spring sheet abuts against the pressure-maintaining rod, and the pressure-maintaining rod abuts against the pressure-maintaining sub-sheet.

[0017] Preferably, each end surface of the pressure-maintaining positive film is provided with an engaging groove, each of the two engaging grooves is provided with a fixing column, a pressure side plate is provided between the inner gear ring and the front cover, and a pressure side plate is also provided between the inner gear ring and the rear cover, one end of the two fixing columns is embedded in the two engaging grooves of the pressure-maintaining positive film, the other end of one of the fixing columns passes through the pressure side plate and is inserted into a front plug hole of the front cover, and one end of the other fixing column passes through the pressure side plate and is inserted into a rear plug hole of the rear cover.

[0018] Preferably, a positioning column is respectively provided at the front and rear ends of the pump body, the positioning column provided at the front end of the pump body is inserted into the positioning hole of the front cover, and the positioning column provided at the rear end of the pump body is inserted into the positioning hole of the rear cover.

[0019] Preferably, the end of the first semi-crescent portion is a first tooth end, and the angle of the first tooth end is 20 to 40 degrees.

[0020] Preferably, the end of the second semi-crescent portion is a second tooth end, the angle of the second tooth end is 15 to 35 degrees, and the angle of the first tooth end is greater than the angle of the second tooth end.

[0021] Preferably, the first elastic piece is a wave spring.

[0022] Preferably, the second elastic piece is a wave spring.

[0023] The beneficial effects of the present invention are:

[0024] When the fluid is sucked into the pump body chamber from the oil inlet and through the oil inlet channel, or when the fluid is discharged from the pump body chamber to the oil outlet through the oil outlet channel, it does not need to pass through the through hole on the inner gear ring, and will not form a turbulent flow obstacle. In addition, in the present invention, the oil outlet is not in the radial direction of the core shaft, and the high-pressure liquid can flow out from the side of the chamber in large quantities to the oil outlet channel for rapid discharge, providing the oil pump with a stable flow rate and pressure output. The high-pressure liquid is not discharged from the outer diameter of the inner gear ring. When the inner gear ring and the pump body are scratched by foreign matter due to the oil sucking in, it will not cause a big problem of pressure drop or flow loss, and it is not easy to cause oil pump failure, which can effectively improve the smoothness of fluid delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 1 BB section view;

[0028] Figure 4 for Figure 1 CC section view;

[0029] Figure 5 is a three-dimensional diagram of a pressure retainer in the present invention;

[0030] Figure 6 is an exploded view of the pressure retainer of the present invention;

[0031] Figure 7 is a side view of the pressure retainer of the present invention;

[0032] Figure 8 It is a schematic diagram of a pressure retaining sub-piece in a pressure retainer when it is in an open state;

[0033] Fig. 9 It is an exploded view of the present invention.

[0034] Reference numerals:

[0035] 1. Pressure-maintaining positive plate; 2. Pressure-maintaining auxiliary plate; 3. First semi-crescent portion; 4. Second semi-crescent portion; 5. Fitting groove; 6. Fixed column; 7. Accommodating groove; 8. First spring plate groove; 9. Second spring plate groove; 10. First spring plate; 11. Second spring plate; 12. Pressure-maintaining rod; 13. Pump body; 14. Front cover; 15. Rear cover; 16. Inner gear ring; 17. Outer gear shaft; 18. Pressure side plate; 19. Front plug hole; 20. Rear plug hole; 21. First tooth end; 22. Outside of first semi-crescent portion; 23. Inside of first semi-crescent portion; 24. Pressure-guiding cavity; 25. Blocking portion; 26. Second tooth end; 27. Oil inlet; 28. Oil inlet channel; 29. ​​Chamber; 30. Oil outlet; 31. Oil outlet channel; 32. Positioning column; 33. Positioning hole; 34. Lubricating oil groove. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further introduced below in conjunction with specific embodiments and drawings. 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 these drawings without paying creative work.

[0037] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "top", "inside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "a group" means two or more.

[0039] like Figure 1-4 As shown, a servo energy-saving inner-rotating gear pump comprises:

[0040] A pump body 13;

[0041] A front cover 14 disposed at the front end of the pump body 13 and a rear cover 15 disposed at the rear end of the pump body 13;

[0042] An inner gear ring 16 disposed in the chamber 29 of the pump body 13 and an outer gear shaft 17 partially meshing with the inner gear ring, a pressure retainer being disposed between the inner gear ring 16 and the outer gear shaft 17;

[0043] The front cover 14 has an oil inlet 27 and an oil inlet passage 28. The oil inlet 27 is connected to the outer end surface of the front cover 14, the oil inlet 27 is connected to the oil inlet passage 28, and the oil inlet passage 28 is connected to the pump body chamber 29. The oil inlet passage 28 can guide the fluid entering from the oil inlet 27 into the pump body chamber 29 in a direction parallel to the axial direction of the outer gear shaft 17.

[0044] The rear cover 15 has an oil outlet 30 and an oil outlet passage 31. The oil outlet 30 is connected to the outer end surface of the rear cover 15, and the oil outlet 30 is connected to the oil outlet passage 31. The oil outlet passage 31 is connected to the pump body chamber 29. The oil outlet passage 31 can guide the high-pressure fluid flowing out of the pump body chamber 29 to the oil outlet 30 in a direction parallel to the axial direction of the outer gear shaft 17. When the fluid is sucked into the pump body chamber 29 from the oil inlet 27 through the oil inlet passage 28 or when the high-pressure fluid is discharged from the pump body chamber 29 through the oil outlet passage 31 to the oil outlet 30, it does not need to pass through the through hole on the inner gear ring, and no turbulent flow obstruction will be formed. The oil outlet passage 31 of the present invention is not arranged on the inner wall of the pump body chamber 29, nor is it arranged in the radial direction of the outer gear shaft 17. The high-pressure fluid formed by pressure can flow out quickly and in large quantities through the side wall of the pump body chamber 29 and through the oil outlet passage 31 and the oil outlet 30. The present invention only has a lubricating oil groove 34 for lubrication in the chamber 29 without a high-pressure outlet oil groove. The present invention can stabilize the pressure and flow of the output fluid, especially at high pressure and low speed, and improve the superior performance of the servo energy-saving pump at high pressure and low speed.

[0045] like Figure 3 As shown, in this embodiment, a positioning column 32 is provided at each of the front and rear ends of the pump body 13. The positioning column 32 provided at the front end of the pump body 13 is inserted into the positioning hole 33 of the front cover 14, and the positioning column 32 provided at the rear end of the pump body 13 is inserted into the positioning hole 33 of the rear cover 15.

[0046] like Figure 4-8 As shown, in this embodiment, the pressure retainer includes a pressure-maintaining main piece 1 and a pressure-maintaining secondary piece 2. The pressure-maintaining main piece 1 is crescent-shaped, and includes a first semi-crescent portion 3 and a second semi-crescent portion 4. The inner and outer circumferential surfaces of the first semi-crescent portion 3 and the second semi-crescent portion 4 are arc-shaped. The pressure-maintaining secondary piece 2 is arc-shaped. The two end surfaces of the pressure-maintaining main piece 1 are each provided with an engaging groove 5, and the two engaging grooves 5 are each provided with a fixing column 6 (as shown in FIG. Figure 3As shown), wherein the outer peripheral surface of the second semi-crescent portion 4 is provided with a receiving groove 7, the pressure-maintaining sub-piece 2 is placed in the receiving groove 7, the bottom of the receiving groove 7 is provided with a first spring clip groove 8 and a second spring clip groove 9, the first spring clip groove 8 is provided with a first spring clip 10, the second spring clip groove 9 is provided with a second spring clip 11 and a pressure-maintaining rod 12, the first spring clip 10 abuts against the pressure-maintaining sub-piece 2, the second spring clip 11 abuts against the pressure-maintaining rod 12, and the pressure-maintaining rod 12 abuts against the pressure-maintaining sub-piece 2.

[0047] like Figure 3 as well as Figure 4 As shown, the pressure-maintaining main plate 1, the pressure-maintaining auxiliary plate 2, the first spring plate 10, the second spring plate 11 and the pressure-maintaining rod 12 are arranged between the outer gear shaft 17 and the inner gear ring 16. The inner circumference of the pressure-maintaining main plate 1 abuts against the gear of the outer gear shaft 17, and the outer circumference of the pressure-maintaining auxiliary plate 2 abuts against the gear of the inner gear ring 16. The outer circumference of the pressure-maintaining auxiliary plate 2 abuts against the gear of the inner gear ring 16 under the elastic force of the first spring plate 10 and the second spring plate 11. A pressure side plate 18 is arranged between the inner gear ring 16 and the front cover 14. A pressure side plate 18 is also provided between the rear cover 15, one end of the two fixing columns 6 is embedded in the two embedding grooves 5 of the pressure-maintaining positive plate 1, the other end of one of the fixing columns 6 passes through the pressure side plate 18 and is inserted into a front insertion hole 19 of the front cover 14, and one end of the other fixing column 6 passes through the pressure side plate 18 and is inserted into a rear insertion hole 20 of the rear cover 15. The combination of the two fixing columns 6 and the two embedding grooves 5 is utilized to maintain the position of the fixed pressure retainer in the servo energy-saving internal rotation gear pump of the present invention.

[0048] like Figure 2-8As shown, when the servo energy-saving internal rotating gear pump of the present invention is actually working, the outer gear shaft 17 is driven by a power source (such as a motor), and then the inner gear ring 16 is driven to rotate synchronously by utilizing the partial meshing relationship between the outer gear shaft 17 and the inner gear ring 16. During the rotation of the two, the fluid (such as hydraulic oil) can be sucked into the chamber of the pump body 13 from the oil inlet. When the fluid is brought to the first semi-crescent portion 3 of the pressure-maintaining positive plate 1, it starts to be split from the first tooth end 21 at the end of the first semi-crescent portion 3. The fluid is divided into two flow directions, one of which flows into the gap between the outer side 22 of the first semi-crescent portion and the tooth portion of the inner gear ring 16. As the gap decreases, a pressurization effect is gradually exerted on the fluid, and the fluid passes through multiple inner gears. The fluid enters the pressure-maintaining secondary plate 2 area only after passing through the teeth of the inner gear ring 16. The fluid is also gradually pressurized in the tooth groove of the inner gear ring 16. The fluid does not change from low pressure to high pressure instantly, which can reduce the occurrence of vapor cavitation and avoid cavitation, thereby avoiding cavitation. Another stream flows into the gap between the inner side 23 of the first semi-crescent and the teeth of the outer gear shaft 17. As the gap decreases, the fluid is gradually pressurized. After passing through 4-5 teeth of the outer gear shaft 17, it enters the second semi-crescent 4 of the pressure-maintaining positive plate 1. The fluid does not change from low pressure to high pressure instantly, which can reduce the occurrence of vapor cavitation, thereby avoiding cavitation and increasing the service life of the pressure retainer. The inner side 23 of the first semi-crescent and the outer side 22 of the first semi-crescent provide excellent flow guidance for the low-pressure fluid, so that the fluid is gradually pressurized.

[0049] like Figure 5-8 As shown, in the present embodiment, the first spring piece 10 is in contact with the pressure-maintaining sub-piece 2, and the first spring piece 10 is preferably a wave spring. The first spring piece 10 can provide elastic force so that the pressure-maintaining sub-piece 2 can be smoothly opened when subjected to the action of the fluid, and the second spring piece 11 is preferably a wave spring, wherein the second spring piece 11 is in contact with the pressure-maintaining rod 12, and the pressure-maintaining rod 12 is in contact with the pressure-maintaining sub-piece 2, so that the pressure-maintaining rod 12 can support the pressure-maintaining sub-piece 2 outward after receiving the elastic force of the second spring piece 11. When the pressure-maintaining sub-piece 2 is opened, the gap between the bottom of the accommodating groove 7 and the pressure-maintaining sub-piece 2 forms a pressure-guiding cavity 24 (such as Figure 8 As shown), the groove wall of the accommodating groove 7 adjacent to the first semi-crescent portion 3 forms a blocking portion 25 (as shown) for blocking the pressure-maintaining secondary sheet 2. Figure 7 As shown in FIG. 1 , a portion of the fluid that has been pressurized to high pressure and enters the pressure-maintaining sub-plate 2 will flow back into the pressure-conducting cavity 24 until the high-pressure fluid is blocked by the pressure-maintaining rod 12 and then flows out of the pressure-conducting cavity.

[0050] like Figure 7 As shown, in this embodiment, in order to produce a better guiding effect, the angle θ1 of the first tooth end 21 should not be too large to avoid eddy currents, but if the angle is too small, no obvious effect can be produced. The angle θ1 of the first tooth end 21 is in the range of 20 to 40 degrees. Figure 7As shown, in the present embodiment, the end of the second semi-crescent portion 4 is the second tooth end 26. If the angle θ2 of the second tooth end 26 is too large, turbulence is likely to occur. The angle θ2 of the second tooth end 26 is in the range of 15 to 35 degrees, and the angle θ1 of the first tooth end 21 is greater than the angle θ2 of the second tooth end 26.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A servo energy-saving internal rotating gear pump, characterized in that: include: A pump body; A front cover disposed at the front end of the pump body and a rear cover disposed at the rear end of the pump body; An inner gear ring disposed in the chamber of the pump body and an outer gear shaft partially meshing with the inner gear ring, a pressure retainer is provided between the inner gear ring and the outer gear shaft; The front cover has an oil inlet and an oil inlet channel, the oil inlet is connected to the outer end surface of the front cover, the oil inlet is connected to the oil inlet channel, the oil inlet channel is connected to the pump body chamber, and the oil inlet channel is used to introduce the fluid entering from the oil inlet into the pump body chamber in a direction parallel to the axial direction of the external gear shaft; The rear cover has an oil outlet and an oil outlet channel, the oil outlet is connected to the outer end surface of the rear cover, the oil outlet is connected to the oil outlet channel, the oil outlet channel is connected to the pump body chamber, and the oil outlet channel is used to guide the high-pressure fluid flowing out of the pump body chamber to the oil outlet in a direction parallel to the axial direction of the external gear shaft; The pressure retainer comprises: A crescent-shaped pressure-maintaining main sheet and an arc-shaped pressure-maintaining auxiliary sheet; The pressure-maintaining positive film includes a first semi-crescent portion and a second semi-crescent portion; The outer peripheral surface of the second semi-crescent portion is provided with a receiving groove, the pressure-maintaining sub-sheet is placed in the receiving groove, the gap between the bottom of the receiving groove and the pressure-maintaining sub-sheet forms a pressure-conducting cavity, and the groove wall of the receiving groove adjacent to the first semi-crescent portion forms a blocking portion for blocking the pressure-maintaining sub-sheet; The bottom of the receiving groove is provided with a first elastic sheet groove and a second elastic sheet groove; A first spring sheet is arranged in the first spring sheet groove, a second spring sheet and a pressure-maintaining rod are arranged in the second spring sheet groove, the first spring sheet abuts against the pressure-maintaining sub-sheet, the second spring sheet abuts against the pressure-maintaining rod, and the pressure-maintaining rod abuts against the pressure-maintaining sub-sheet; The two end surfaces of the pressure-maintaining positive sheet are each provided with an engaging groove, and each of the two engaging grooves is provided with a fixing column. A pressure side plate is provided between the inner gear ring and the front cover, and a pressure side plate is also provided between the inner gear ring and the rear cover. One end of the two fixing columns is embedded in the two engaging grooves of the pressure-maintaining positive sheet, and the other end of one of the fixing columns passes through the pressure side plate and is inserted into a front insertion hole of the front cover, and one end of the other fixing column passes through the pressure side plate and is inserted into a rear insertion hole of the rear cover; The front and rear ends of the pump body are each provided with a positioning column, the positioning column provided at the front end of the pump body is inserted into the positioning hole of the front cover, and the positioning column provided at the rear end of the pump body is inserted into the positioning hole of the rear cover.

2. The servo energy-saving inner-rotating gear pump according to claim 1 is characterized in that: The end of the first semi-crescent portion is a first tooth end, and the angle of the first tooth end is 20 to 40 degrees.

3. The servo energy-saving inner-rotating gear pump according to claim 2 is characterized in that: The end of the second semi-crescent portion is a second tooth end, the angle of the second tooth end is 15-35 degrees, and the angle of the first tooth end is greater than the angle of the second tooth end.

4. The servo energy-saving inner-rotating gear pump according to claim 1, characterized in that: The first elastic piece is a wave spring.

5. The servo energy-saving inner-rotating gear pump according to claim 1, characterized in that: The second elastic piece is a wave spring.

Images