A double circular arc toothed hydraulic gear pump

Abstract

This utility model discloses a double-arc toothed hydraulic gear pump, relating to the field of hydraulic gear pump technology. It includes a gear pump housing and a gear pump cover plate. Two arc-shaped toothed gears are rotatably connected inside the gear pump housing. The gear pump cover plate is disposed on one side of the gear pump housing. A sealing gasket is provided between the gear pump housing and the gear pump cover plate. Annular plates are fitted onto the outer surfaces of both the gear pump housing and the gear pump cover plate. Each of the two annular plates has two symmetrical insertion holes on its upper surface, and insertion blocks are inserted into the corresponding two insertion holes. One end of each insertion block has a groove. This utility model utilizes the continuous pressure of a first spring to push a fixed block downwards, causing the annular plates to maintain a tight fit between the gear pump housing and the cover plate. When the sealing gasket wears due to vibration, the spring automatically releases potential energy to fill the gap, thereby preventing a decrease in the sealing performance of the gear pump.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic gear pump technology, specifically to a double circular arc tooth hydraulic gear pump. Background Technology

[0002] A gear pump is a positive displacement pump that relies on the volume change generated by the meshing and rotation of gears to transport liquids. In hydraulic transmission systems, double circular arc tooth hydraulic gear pumps are widely used in engineering machinery, machine tool equipment and other fields due to their advantages such as small flow pulsation and high volumetric efficiency.

[0003] The sealing performance between the outer shell and the cover plate is the core of ensuring stable pump pressure. Once the seal fails, it will not only lead to hydraulic oil leakage, but also cause cavitation due to air intake, which will aggravate the wear of gears and bearings and shorten the service life of the pump.

[0004] The existing sealing structure of double circular arc toothed hydraulic gear pumps has significant defects: the sealing gasket between the outer shell and the cover plate is mostly tightened by bolts. Although it can achieve initial sealing, the high-frequency vibration during the operation of the gear pump will cause the bolts to loosen, causing the sealing gasket to be under alternating stress for a long time, which accelerates its aging and wear. When the sealing gasket wears and gaps are generated, the traditional rigid connection cannot automatically compensate, resulting in a linear decrease in sealing performance over time. Utility Model Content

[0005] In view of the problems existing in the above-mentioned hydraulic gear pumps, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a double circular arc toothed hydraulic gear pump, which solves the problem that the existing gear pump gasket will wear due to the vibration generated by the operation of the gear pump during long-term use, thereby affecting the sealing effect of the gear pump.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A double-arc toothed hydraulic gear pump includes a gear pump housing and a gear pump cover plate. Two arc-shaped toothed gears are rotatably connected inside the gear pump housing. The gear pump cover plate is disposed on one side of the gear pump housing. A sealing gasket is provided between the gear pump housing and the gear pump cover plate. Annular plates are fitted onto the outer surfaces of both the gear pump housing and the gear pump cover plate. Two symmetrical insertion holes are located on the upper surfaces of the two annular plates. Insert blocks are inserted into the corresponding two insertion holes. A groove is formed at one end of each of the two insertion blocks. A fixing block is slidably disposed inside each of the two grooves. A connecting rod is fixedly connected to the upper surface of each of the two fixing blocks. The upper ends of each connecting rod penetrate one side of the groove and are respectively fixed to a baffle. A first spring is fitted onto the wall of each connecting rod. A sliding groove is formed on one side of each of the two fixing blocks. A fixing mechanism is provided inside each of the two sliding grooves. The two fixing blocks are fixed by their respective fixing mechanisms.

[0009] Preferably, the fixing mechanism includes two trapezoidal limiting blocks, two trapezoidal pressing blocks, two second springs, and two pressing plates. The two second springs are respectively fixedly connected to the inside of the corresponding slide grooves, and the two trapezoidal pressing blocks are respectively fixedly connected to one end of the corresponding second springs. The lower surface of the two slide grooves is provided with insertion holes. The two trapezoidal pressing blocks are respectively slidably disposed inside the corresponding insertion holes, and the two pressing plates are respectively fixedly connected to one end of the corresponding trapezoidal pressing blocks.

[0010] Preferably, one side of each of the two grooves is provided with a plurality of slots, each slot being matched with a corresponding trapezoidal limiting block.

[0011] Preferably, a trapezoidal groove is provided on one side of each of the two trapezoidal limiting blocks, and each trapezoidal groove is in contact with the inclined surface of the trapezoidal pressure block.

[0012] Preferably, two telescopic rods are symmetrically fixedly connected between each of the two fixing blocks and the corresponding pressing plate.

[0013] Preferably, the outer surface of one end of each of the two inserts is provided with threads, and one end of each of the two inserts is provided with a nut.

[0014] Preferably, a limiting groove is provided on one side of each of the two grooves, and a limiting block is slidably provided inside each of the two limiting grooves. The two limiting blocks are respectively fixedly connected to one side of the corresponding fixing block.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] 1. In this utility model, the fixed block is pushed down by the continuous pressure of the first spring, which drives the annular plate to keep the gear pump housing and the cover plate in close contact. When the sealing gasket is worn due to vibration, the spring automatically releases potential energy to fill the gap, thereby preventing the gear pump from becoming less sealed.

[0017] 2. In this utility model, the trapezoidal pressure block and the limiting block of the fixing mechanism can be fixed again after elastic compensation to prevent the fixing block from moving to the outside of the groove due to vibration. The locking can be released by pressing the pressure plate, which makes it convenient to disassemble the insert and replace the new sealing gasket. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 For the present utility model Figure 1 A sectional view;

[0021] Figure 3 For the present utility model Figure 2 Enlarged schematic diagram of part A.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Gear pump housing, 2. Gear pump cover plate, 3. Circular arc toothed gear, 4. Sealing gasket, 5. Annular plate, 6. Insert block, 7. Fixing block, 8. Connecting rod, 9. Baffle, 10. First spring, 11. Trapezoidal limit block, 12. Trapezoidal pressure block, 13. Second spring, 14. Pressing plate, 15. Telescopic rod, 16. Nut, 17. Limit block. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] This utility model discloses a double circular arc toothed hydraulic gear pump.

[0026] This utility model provides, for example Figure 1-3The illustrated double-arc toothed hydraulic gear pump includes a gear pump housing 1 and a gear pump cover plate 2. Two arc-shaped toothed gears 3 are rotatably connected inside the gear pump housing 1. The gear pump cover plate 2 is located on one side of the gear pump housing 1. A sealing gasket 4 is provided between the gear pump housing 1 and the gear pump cover plate 2. Annular plates 5 are fitted onto the outer surfaces of both the gear pump housing 1 and the gear pump cover plate 2. Each annular plate 5 has two symmetrical insertion holes on its upper surface, and insertion blocks 6 are inserted into the corresponding two insertion holes. A groove is provided at one end of each insertion block 6. Both grooves have a fixed block 7 slidably installed inside them. Both fixed blocks 7 have a connecting rod 8 fixedly connected to their upper surfaces. The upper ends of both connecting rods 8 pass through one side of the groove and are fixedly connected to the baffle 9. Both connecting rods 8 have a first spring 10 sleeved on their rod walls. Both fixed blocks 7 have a sliding groove on one side. Both sliding grooves have a fixing mechanism installed inside them. The two fixed blocks 7 are fixed by their respective fixing mechanisms. Both inserts 6 have threads on the outer surface of one end. Both inserts 6 have nuts 16 installed at one end.

[0027] Insert the plug 6 into the corresponding socket, then stretch the plug 6 and screw the nut 16 to one end of the plug 6. At this time, the first spring 10 is compressed and stores elastic potential energy, generating continuous downward pressure. When the sealing gasket is worn, the gap between the gear pump housing 1 and the cover plate 2 will increase due to the reduction in the thickness of the sealing gasket. At this time, the reaction force of the annular plate 5 on the plug 6 is weakened. Since the first spring 10 is always in a compressed state, its stored elastic potential energy will push the fixing block 7 to slide downward in the groove of the plug 6. Through the linkage of the connecting rod 8 and the baffle 9, the pressure of the first spring is continuously transmitted to the annular plate 5, thereby driving the housing and the cover plate to move closer to each other and fill the gap caused by the wear of the sealing gasket.

[0028] In order to ensure that the fixed block 7 can be fixed after being moved, such as Figure 2-3 As shown, the fixing mechanism includes two trapezoidal limiting blocks 11, two trapezoidal pressing blocks 12, two second springs 13, and two pressing plates 14. The two second springs 13 are fixedly connected to the inside of the corresponding slide grooves, and the two trapezoidal pressing blocks 12 are fixedly connected to one end of the corresponding second springs 13. The lower surface of the two slide grooves is provided with insertion holes. The two trapezoidal pressing blocks 12 are slidably disposed inside the corresponding insertion holes. The two pressing plates 14 are fixedly connected to one end of the corresponding trapezoidal pressing blocks 12. Multiple slots are provided on one side of the two grooves, and each slot is matched with the corresponding trapezoidal limiting block 11.

[0029] When the fixed block 7 slides due to the push of the first spring, the trapezoidal limiting block 11 will be squeezed by the inner wall of the slot. The lateral force generated by the squeeze will push the trapezoidal pressure block 12 to retract into the slide groove, compressing the second spring 13, so that the trapezoidal limiting block 11 temporarily disengages from the current slot, allowing the fixed block 7 to move to a new position. When the fixed block 7 slides to the new position, the elastic potential energy of the second spring 13 is released, pushing the trapezoidal pressure block 12 to reset, and pushing the trapezoidal limiting block 11 back into the slot at the corresponding position, relocking the fixed block.

[0030] To facilitate the outward extension of the insert, such as Figure 2-3 As shown, trapezoidal grooves are provided on one side of the two trapezoidal limiting blocks 11, and each trapezoidal groove fits into the inclined surface of the trapezoidal pressure block 12. Two telescopic rods 15 are symmetrically fixedly connected between the two fixing blocks 7 and the corresponding pressing plates 14.

[0031] Press the pressing plate 14, and then the trapezoidal pressing block 12 can squeeze the inclined surface of the trapezoidal groove and drive the trapezoidal limiting block 11 to move out into the groove, so that the trapezoidal limiting block 11 can be moved out from the inside of the corresponding slot, so that the insert 6 can move outward. During this process, the telescopic rod 15 can prevent the trapezoidal pressing block 12 from falling off.

[0032] To prevent the insert from rotating, such as Figure 2-3 As shown, a limiting groove is provided on one side of each of the two grooves, and a limiting block 17 is slidably provided inside each of the two limiting grooves. The two limiting blocks 17 are respectively fixedly connected to one side of the corresponding fixing block 7.

[0033] The limiting block 17 can be used to limit the movement and prevent the insert block from rotating.

[0034] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A double circular arc tooth profile hydraulic gear pump comprising a gear pump housing (1) and a gear pump cover plate (2), characterized in that, The gear pump housing (1) is internally connected to two arc-shaped gears (3). The gear pump cover plate (2) is located on one side of the gear pump housing (1). A sealing gasket (4) is provided between the gear pump housing (1) and the gear pump cover plate (2). Both the outer surfaces of the gear pump housing (1) and the gear pump cover plate (2) are fitted with annular plates (5). The upper surfaces of the two annular plates (5) each have two symmetrical insertion holes. Insert blocks (6) are inserted into the interior of the two corresponding insertion holes. One end of each of the two insertion blocks (6) is... The two grooves are provided with a fixed block (7) slidably disposed inside each groove. A connecting rod (8) is fixedly connected to the upper surface of each fixed block (7). The upper ends of each connecting rod (8) pass through one side of the groove and are fixedly connected to a baffle (9). A first spring (10) is sleeved on the rod wall of each connecting rod (8). A sliding groove is provided on one side of each fixed block (7). A fixing mechanism is provided inside each sliding groove. The two fixed blocks (7) are fixed by the corresponding fixing mechanism.

2. The dual circular arc tooth profile hydraulic gear pump of claim 1, wherein, The fixing mechanism includes two trapezoidal limiting blocks (11), two trapezoidal pressing blocks (12), two second springs (13) and two pressing plates (14). The two second springs (13) are respectively fixedly connected to the inside of the corresponding slide grooves. The two trapezoidal pressing blocks (12) are respectively fixedly connected to one end of the corresponding second spring (13). The lower surface of the two slide grooves is provided with insertion holes. The two trapezoidal pressing blocks (12) are respectively slidably disposed inside the corresponding insertion holes. The two pressing plates (14) are respectively fixedly connected to one end of the corresponding trapezoidal pressing blocks (12).

3. The dual circular arc tooth profile hydraulic gear pump of claim 1, wherein, Multiple slots are provided on one side of the two grooves, and each slot is matched with a corresponding trapezoidal limiting block (11).

4. The dual circular arc tooth profile hydraulic gear pump of claim 2, wherein, One side of each of the two trapezoidal limiting blocks (11) is provided with a trapezoidal groove, and each trapezoidal groove is in contact with the inclined surface of the trapezoidal pressure block (12).

5. The dual circular arc profile hydraulic gear pump of claim 1, wherein, Two telescopic rods (15) are symmetrically fixedly connected between the two fixed blocks (7) and the corresponding pressing plates (14).

6. The double-arc toothed hydraulic gear pump according to claim 1, characterized in that, The outer surface of one end of each of the two inserts (6) is provided with threads, and one end of each of the two inserts (6) is provided with a nut (16).

7. The dual circular arc profile hydraulic gear pump of claim 1, wherein, Each of the two grooves has a limiting groove on one side, and a limiting block (17) is slidably arranged inside each of the two limiting grooves. The two limiting blocks (17) are respectively fixedly connected to one side of the corresponding fixing block (7).

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