A seal structure and a liquid rotor pump thereof

Abstract

The utility model discloses a sealing structure and liquid rotor pump thereof relates to rotor pump field, including end cover and be used for sealing end cover's sealing cover and connecting cover, be provided with sealing seat and buffer pad between sealing cover and connecting cover, set up by sealing pad and the first seal of card block, and the second seal of by first, second pad, the cooperation of these two seals, formed redundancy sealing system, when the inside of end cover appears transient high pressure, and pressure will promote sealing seat to move compression buffer pad, through buffer pad absorption and release the pressure energy of too high, avoided the damage of rigid impact to sealing structure, and the movement of sealing seat transforms into the extrusion of second pad to first pad simultaneously, so that secondary seal not only does not lose effect when high pressure, but rather gets enhancement, realizes the self -adaptation sealing effect of more pressure more tight.

Description

Technical Field

[0001] This utility model relates to the field of rotor pumps, and in particular to a sealing structure and its liquid rotor pump. Background Technology

[0002] The reliability of the seal between the pump body and the end cover of a liquid rotor pump directly affects the pump's efficiency, lifespan, and the safety of the working environment.

[0003] Chinese patent CN222067056U discloses a rotor pump gland structure, which includes a pump body, a main shaft, and a secondary shaft. The main shaft and secondary shaft are installed inside the pump body. The portions of the main shaft and secondary shaft located inside the pump body are connected to a rotor via a key. Each end of the main shaft and secondary shaft has a threaded hole, and a locking wire threaded sleeve is threaded into the threaded hole. A countersunk hole is formed on one side of the rotor, and a gland is installed inside the countersunk hole. A fixing hole is formed on one side of the gland, and a flange bolt is installed inside the fixing hole.

[0004] This design uses flange bolts passing through the gland and connecting it to a locking wire thread sleeve to abut the gland against the rotor, thus restricting the rotor's axial movement and enhancing its anti-loosening capability. Simultaneously, it compresses the first sealing ring, forming an axial seal to prevent leakage. Furthermore, the reaction force after the second sealing ring is compressed further improves the anti-loosening capability of the threads.

[0005] However, this solution only achieves the positioning and installation function of "the pump cover 2 is connected to the groove 3 of the pump body 1 by the retaining strip 4, and a third sealing ring 5 is set in the groove 3 to increase the sealing performance of the pump body 1" when sealing the pump cover and the pump body 1. However, in actual operation, liquid rotor pumps often experience severe pressure pulsations and instantaneous high pressures due to start-up and shutdown, valve opening and closing, or sudden changes in operating conditions.

[0006] Relying solely on the third sealing ring for pump body sealing is effective under stable operating conditions. However, when instantaneous high pressure occurs in the pump chamber, this pressure will directly act on the end cover and its seals, potentially causing the fixed sealing surface to be momentarily pushed open, creating a tiny gap and leading to fluid leakage. Therefore, we propose a sealing structure and its liquid rotor pump to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a sealing structure and its liquid rotor pump to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a sealing structure and its liquid rotor pump, comprising an end cover and a sealing cover and a connecting cover for sealing the end cover, wherein a sealing seat and a buffer pad are provided between the sealing cover and the connecting cover, and the sealing seat moves and compresses the buffer pad when the instantaneous pressure inside the end cover is too high, so as to achieve pressure buffering and release. The sealing seat fits into the end cap, and a sealing gasket is provided on the sealing seat. A slot is provided in the sealing gasket, and a locking block is provided on the end cap to cooperate with the slot. The initial sealing of the end cap is achieved by the locking of the slot and the locking block. The sealing seat is also provided with a second fitting gasket, and the connecting cover is provided with a corresponding first fitting gasket. The first and second fitting gaskets form a secondary seal. When the sealing seat is pushed by pressure, the second and first fitting gaskets squeeze each other to strengthen the secondary seal.

[0009] Preferably, each of the four corners of the end cap is fitted with a connecting rod, the front end of the connecting rod is provided with a threaded structure, the sealing cap is provided with a first connecting hole, the connecting cap is provided with a second connecting hole, the sealing cap and the connecting cap are sequentially fitted onto the connecting rod, and are threadedly connected to the connecting rod by bolts, thereby pressing the sealing cap and the connecting cap tightly onto the front end of the end cap.

[0010] Preferably, the sealing cap has a sleeve portion at both the upper and lower ends. The sleeve portion is sleeved on the outer periphery of the connecting cap. The sleeve portion has an installation hole, and the connecting cap has a corresponding threaded hole. A fixing bolt passes through the installation hole and is threadedly connected to the threaded hole to fix the sealing cap and the connecting cap.

[0011] Preferably, a positioning ring is provided inside the connecting cover, and a placement cavity for accommodating the sealing seat and the buffer pad is formed between the positioning ring and the inner wall of the connecting cover, and the first fitting pad is disposed on the positioning ring.

[0012] Preferably, the sealing seat is provided with a limiting seat, which is slidably disposed in the placement cavity of the connecting cover and cooperates with the positioning ring sleeve to limit the movement path of the sealing seat.

[0013] Preferably, the contact surfaces of the first bonding pad and the second bonding pad are mutually mating arc-shaped structures.

[0014] Preferably, the cushioning pad is made of nitrile rubber.

[0015] Preferably, it includes a pump body and an impeller structure, wherein the impeller structure is disposed within a pump cavity enclosed by the pump body and the end cover; The impeller structure includes a rotor shaft inserted into the end cover. A first bearing, a meshing gear, and a second bearing are sequentially inserted into the rotor shaft. The pump body is provided with a receiving groove for accommodating the meshing gear. The meshing gears on the two rotor shafts mesh with each other in the receiving groove. The rotor shaft has a plug-in shaft at its front end, and the impeller body is sleeved on the plug-in shaft.

[0016] Preferably, the rotor shaft has a threaded groove, and a locking sleeve that engages with the meshing gear is threaded onto the threaded groove.

[0017] Preferably, the pump body is provided with a bearing housing, the rotor shaft is supported in the bearing housing by a first bearing, and one of the rotor shafts extends out of the pump body to connect to the drive device.

[0018] The technical effects and advantages of this utility model are as follows: When instantaneous high pressure occurs inside the end cap, the pressure will push the sealing seat to move and compress the buffer pad. The buffer pad absorbs and releases the excessive pressure energy, avoiding damage to the sealing structure from hard impact. At the same time, the movement of the sealing seat is converted into the squeezing force of the second bonding pad on the first bonding pad, so that the secondary seal not only does not fail under high pressure, but is also strengthened, achieving an adaptive sealing effect that gets tighter under pressure.

[0019] A first seal consisting of a sealing gasket and a retaining block is provided, and a second seal consisting of a first and a second mating gasket. These two seals work together to form a redundant sealing system. Under normal pressure, the first seal provides the main sealing function, while under high pressure, the second seal is activated and strengthened, improving the reliability and safety of the entire sealing structure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram showing the disassembled connection cover and sealing cover of this utility model; Figure 4 This is a schematic diagram of the connecting cover and sealing cover structure of this utility model; Figure 5 This is an exploded view of the connecting cover and sealing cover of this utility model; Figure 6 This is a schematic diagram of the sealing seat structure of this utility model; Figure 7 This is a schematic diagram of the connecting cover structure of this utility model; Figure 8 This is a schematic diagram of the impeller structure of this utility model.

[0021] In the diagram: 1. End cap; 11. Inlet / outlet; 12. Clamping block; 2. Pump body; 21. Sleeve rod; 3. Sealing cap; 31. Sleeve part; 32. First sleeve hole; 33. Mounting hole; 4. Connecting cap; 41. Positioning ring sleeve; 42. First fitting gasket; 43. Second sleeve hole; 44. Threaded hole; 5. Sealing seat; 51. Limiting seat; 52. Second fitting gasket; 53. Sealing gasket; 54. Slot; 6. Buffer pad; 7. Impeller structure; 71. Rotor shaft; 72. First bearing; 73. Meshing gear; 74. Second bearing; 75. Insert shaft; 76. Impeller body. Detailed Implementation

[0022] 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.

[0023] This utility model provides, for example Figures 1-8 The sealing structure and its liquid rotor pump shown include an end cover 1, a sealing cover 3 and a connecting cover 4 for sealing the end cover 1. A sealing seat 5 and a buffer pad 6 are provided between the sealing cover 3 and the connecting cover 4. When the instantaneous pressure inside the end cover 1 is too high, the sealing seat 5 moves and compresses the buffer pad 6 to achieve pressure buffering and release. Inlet and outlet ports 11 are respectively provided on both sides of the end cover 1. The sealing seat 5 fits into the end cap 1, and a sealing gasket 53 is provided on the sealing seat 5. A slot 54 is provided in the sealing gasket 53. A locking block 12 that cooperates with the slot 54 is provided on the end cap 1. The initial sealing of the end cap 1 is achieved by the locking of the slot 54 and the locking block 12. The sealing seat 5 is also provided with a second bonding pad 52, and the connecting cover 4 is provided with a first bonding pad 42. The first bonding pad 42 and the second bonding pad 52 form a secondary seal. When the sealing seat 5 is pushed by pressure, the second bonding pad 52 and the first bonding pad 42 are squeezed against each other to strengthen the secondary seal.

[0024] When a momentary high pressure occurs inside the end cap 1, the pressure will push the sealing seat 5 to move and compress the buffer pad 6. The buffer pad 6 absorbs and releases the excessive pressure energy, avoiding damage to the sealing structure from the hard impact. At the same time, the movement of the sealing seat 5 is converted into the squeezing force of the second bonding pad 52 on the first bonding pad 42, so that the secondary seal not only does not fail under high pressure, but is also strengthened, achieving an adaptive sealing effect that gets tighter under pressure.

[0025] Each of the four corners of the end cap 1 is fitted with a sleeve rod 21. The front end of the sleeve rod 21 is provided with a threaded structure. The sealing cap 3 is provided with a first sleeve hole 32, and the connecting cap 4 is provided with a second sleeve hole 43. The sealing cap 3 and the connecting cap 4 are sequentially fitted onto the sleeve rod 21 and are threadedly connected to the sleeve rod 21 by bolts, pressing the sealing cap 3 and the connecting cap 4 tightly against the front end of the end cap 1.

[0026] During installation, since the connecting rod 21 is fixedly connected to the pump body 2, the end cover 1 is fitted onto the connecting rod 21, and the end cover 1 is fitted onto the pump body 2. At this time, the insertion shaft 75 is inserted into the end cover 1. Then, by fitting the impeller body 76 onto the insertion shaft 75, the impeller body 76 is locked onto the insertion shaft 75 by bolts. First, the sealing seat 5 is installed in the connecting cover 4, and the second fitting gasket 52 and the sealing gasket 53 are installed on the sealing seat 5, so that the second fitting gasket 52 is set and fitted to the first fitting gasket 42 on the connecting cover 4. Then, the connecting cover 4 is sleeved on the sleeve rod 21. Under the guidance and positioning of the sleeve rod 21, the sealing gasket 53 is positioned to correspond to the position of the locking block 12 on the end cover 1. At this time, the buffer pad 6 is placed in the connecting cover 4. By fitting the sealing cover 3 onto the connecting rod 21, the sealing cover 3 slides along the connecting rod 21 and fits against the connecting cover 4, thus covering the buffer pad 6 and the sealing seat 5 in the sealing cover 3 and the connecting cover 4. Then, by installing the nut seat on the connecting rod 21 and fastening the nut seat to the sealing cover 3, the connecting cover 4 is pushed to press against the end cover 1. At the same time, the sealing cover 3 squeezes the buffer pad 6, so that the buffer pad 6 squeezes the sealing seat 5 and the end cover 1 tightly, and the sealing pad 53 is snapped into the outer peripheral wall of the card block 12 through the card groove 54 to seal the end cover 1. At this time, the pressure can be buffered and released under the action of the buffer pad 6. By converting the pressure into the pressure of the second bonding pad 52 on the sealing seat 5 against the first bonding pad 42 on the connecting cover 4, the effect of secondary sealing is further enhanced.

[0027] Example 1: Both the upper and lower ends of the sealing cover 3 are provided with a sleeve part 31. The sleeve part 31 is sleeved on the outer periphery of the connecting cover 4. The sleeve part 31 is provided with an installation hole 33. The connecting cover 4 is provided with a corresponding threaded hole 44. The sealing cover 3 and the connecting cover 4 are fixed by passing through the installation hole 33 and threading it with the threaded hole 44 through the fixing bolt.

[0028] When the sealing cap 3 and the connecting cap 4 are attached, the sealing cap 3 moves toward the connecting cap 4 under the pressure of the fastening bolts, and together with the buffer pad 6 and the sealing seat 5, it presses the connecting cap 4. As the sealing cap 3 moves toward the connecting cap 4, until the mounting hole 33 on the sealing cap 3 corresponds to the threaded hole 44 on the connecting cap 4, it can be determined that the sealing cap 3 and the connecting cap 4 are properly connected. Then, by installing the fixing bolts in the mounting hole 33 and the threaded hole 44, the relative positions of the sealing cover 3 and the connecting cover 4 are fixed to form an integral sealing structure.

[0029] The connecting cover 4 is provided with a positioning ring 41 inside. The positioning ring 41 and the inner wall of the connecting cover 4 form a placement cavity for accommodating the sealing seat 5 and the buffer pad 6. The first fitting pad 42 is provided on the positioning ring 41.

[0030] The sealing seat 5 is provided with a limiting seat 51, which is slidably disposed in the placement cavity of the connecting cover 4 and cooperates with the positioning ring sleeve 41 to limit the movement path of the sealing seat 5.

[0031] Under the action of the limiting seat 51, when the limiting seat 51 is in contact with the connecting cover 4, the position of the sealing seat 5 moves to the farthest position of the connecting cover 4. When the sealing seat 5 is impacted by the instantaneous pressure in the end cover 1, the limiting seat 51 can slide in the connecting cover 4. Under the action of the limiting seat 51, the sliding path of the sealing seat 5 is limited to be stable, thereby ensuring the accuracy of the docking between the second mating pad 52 and the first mating pad 42 on the sealing seat 5, and avoiding the docking deviation from affecting the sealing effect. At the same time, the moving sealing seat 5 compresses the buffer pad 6. When the instantaneous pressure decreases, the buffer pad 6 gives the sealing seat 5 a reaction force, pushing the sealing seat 5 to move. Under the limiting action of the limiting seat 51, the limiting seat 51 slides to the initial position, so that the sealing pad 53 and the locking block 12 are connected, ensuring its sealing effect.

[0032] The contact surfaces of the first bonding pad 42 and the second bonding pad 52 are mutually mating arc-shaped structures.

[0033] By setting it to an arc shape, it is easy for the first bonding pad 42 and the second bonding pad 52 to adhere together. At the same time, under compression, the first bonding pad 42 and the second bonding pad 52 adhere tightly together.

[0034] The buffer pad 6 is made of nitrile rubber, and an X-shaped cross section can be provided on the buffer pad 6. The X-shaped cross section can provide more controllable deformation and rebound force when under pressure.

[0035] Example 2: Includes a pump body 2 and an impeller structure 7, the impeller structure 7 being disposed within the pump cavity enclosed by the pump body 2 and the end cover 1; The impeller structure 7 includes a rotor shaft 71 inserted into the end cover 1. A first bearing 72, a meshing gear 73, and a second bearing 74 are sequentially inserted into the rotor shaft 71. The pump body 2 is provided with a receiving groove for accommodating the meshing gear 73. The meshing gears 73 on the two rotor shafts 71 mesh with each other in the receiving groove. The rotor shaft 71 has a plug-in shaft 75 at its front end, and the impeller body 76 is sleeved on the plug-in shaft 75.

[0036] The rotor shaft 71 has a threaded groove, and a locking sleeve that engages with the meshing gear 73 is threaded onto the threaded groove.

[0037] The pump body 2 is provided with a bearing housing, and the rotor shaft 71 is supported in the bearing housing by the first bearing 72, and one of the rotor shafts 71 extends to the outside of the pump body 2 to connect to the drive device.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure, characterized in that, Includes an end cap (1) and a sealing cap (3) and a connecting cap (4) for sealing the end cap (1). A sealing seat (5) and a buffer pad (6) are provided between the sealing cap (3) and the connecting cap (4). When the instantaneous pressure inside the end cap (1) is too high, the sealing seat (5) moves and compresses the buffer pad (6) to achieve pressure buffering and release. The sealing seat (5) is fitted to the end cap (1), and a sealing gasket (53) is provided on the sealing seat (5). A slot (54) is provided in the sealing gasket (53), and a locking block (12) is provided on the end cap (1) to cooperate with the slot (54). The initial sealing of the end cap (1) is achieved by the locking of the slot (54) and the locking block (12). The sealing seat (5) is also provided with a second fitting pad (52), and the connecting cover (4) is provided with a first fitting pad (42) correspondingly. The first fitting pad (42) and the second fitting pad (52) form a secondary seal. When the sealing seat (5) is pushed by pressure, the second fitting pad (52) and the first fitting pad (42) squeeze each other to strengthen the secondary seal.

2. The sealing structure according to claim 1, characterized in that, Each of the four corners of the end cap (1) is fitted with a sleeve rod (21). The front end of the sleeve rod (21) is provided with a threaded structure. The sealing cap (3) is provided with a first sleeve hole (32), and the connecting cap (4) is provided with a second sleeve hole (43). The sealing cap (3) and the connecting cap (4) are sequentially fitted onto the sleeve rod (21) and are threadedly connected to the sleeve rod (21) by bolts, thereby pressing the sealing cap (3) and the connecting cap (4) tightly against the front end of the end cap (1).

3. The sealing structure according to claim 1, characterized in that, The sealing cover (3) is provided with a sleeve part (31) at both the upper and lower ends. The sleeve part (31) is sleeved on the outer periphery of the connecting cover (4). The sleeve part (31) is provided with an installation hole (33). The connecting cover (4) is provided with a threaded hole (44). The sealing cover (3) and the connecting cover (4) are fixed by passing through the installation hole (33) and threading it with the threaded hole (44) with a fixing bolt.

4. A sealing structure according to claim 1, characterized in that, The connecting cover (4) is provided with a positioning ring (41) inside. The positioning ring (41) and the inner wall of the connecting cover (4) form a placement cavity for accommodating the sealing seat (5) and the buffer pad (6). The first fitting pad (42) is provided on the positioning ring (41).

5. A sealing structure according to claim 4, characterized in that, The sealing seat (5) is provided with a limiting seat (51), which is slidably disposed in the placement cavity of the connecting cover (4) and cooperates with the positioning ring sleeve (41) to limit the movement path of the sealing seat (5).

6. A sealing structure according to claim 1, characterized in that, The contact surfaces of the first bonding pad (42) and the second bonding pad (52) are mutually matching arc-shaped structures.

7. A sealing structure according to claim 1, characterized in that, The buffer pad (6) is made of nitrile rubber.

8. A liquid rotor pump, based on a sealing structure according to any one of claims 1-7, characterized in that, It includes a pump body (2) and an impeller structure (7), wherein the impeller structure (7) is disposed within a pump cavity enclosed by the pump body (2) and the end cover (1); The impeller structure (7) includes a rotor shaft (71) inserted into the end cover (1). A first bearing (72), a meshing gear (73), and a second bearing (74) are sequentially inserted into the rotor shaft (71). The pump body (2) is provided with a receiving groove for accommodating the meshing gear (73). The meshing gears (73) on the two rotor shafts (71) mesh with each other in the receiving groove. The rotor shaft (71) is provided with a plug-in shaft (75) at its front end, and an impeller body (76) is sleeved on the plug-in shaft (75).

9. The liquid rotor pump according to claim 8, characterized in that, The rotor shaft (71) has a threaded groove, and a locking sleeve that engages with the meshing gear (73) is threaded onto the threaded groove.

10. The liquid rotor pump according to claim 8, characterized in that, The pump body (2) is provided with a bearing housing, and the rotor shaft (71) is supported in the bearing housing by a first bearing (72), and one of the rotor shafts (71) extends to the outside of the pump body (2) to connect to the drive device.

Images