Horizontal gear pump end face sealing structure

Abstract

The utility model discloses a horizontal gear pump end face sealing structure belongs to volumetric gear pump technical field, and end face sealing structure includes with the shaft seal body end face of the adhesion of pump body and is provided with first recess, and first recess is placed between first annular mounting hole group and first backflow groove, and is provided with first sealing element in first recess, with the back cover end face of the adhesion of pump body and is provided with second recess, and second recess is placed between second annular mounting hole group and second backflow groove, and is provided with second sealing element in second recess. The utility model can promote the overall performance and operating stability of pump group. Compared with traditional oil absorption swelling oil resistance asbestos fiberboard or lead plate sealing mode, ring seal not only kept the simplicity of structure, but also realized the accurate mechanical control of end face gap value.

Description

Technical Field

[0001] This utility model belongs to the technical field of positive displacement gear pumps, and particularly relates to a horizontal gear pump end face sealing structure. Background Technology

[0002] Gear pumps are positive displacement pumps widely used in various industrial fields such as petroleum, chemical, and shipbuilding to transport media with a certain viscosity and free of impurities. Gear pump leakage includes axial clearance leakage (i.e., end face clearance leakage), radial clearance leakage, and leakage at the gear meshing point. The amount of leakage determines the final performance of the gear pump, with end face leakage accounting for 75-80% of the total leakage.

[0003] Currently, two materials are commonly used for gear pump end face seals: oil-resistant, asbestos-free fiberboard that absorbs and swells, and traditional lead plates. The choice of these materials aims to ensure an effective and durable seal of the end face gap when the gear pump is conveying fluid. However, in practical applications, both sealing materials undergo dimensional changes due to gasket compression and swelling effects, significantly impacting the value of the end face gap. For oil-resistant, asbestos-free fiberboard, when in contact with oil, it absorbs oil and swells, increasing the gasket size and thus reducing the end face gap, enhancing the sealing effect. However, excessive swelling can also lead to an overly tight gasket, increasing friction and wear, and even affecting the normal operation of the gear pump. On the other hand, lead plates, as sealing materials, deform under compression, filling the end face gap and forming an effective seal. However, the compressibility of lead plates also means that they may gradually lose their sealing effect due to stress relaxation during long-term use, leading to increased gap and leakage. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a horizontal gear pump end face sealing structure that can improve the overall performance and operational stability of the pump unit. Compared with traditional oil-absorbing, swelling, oil-resistant, asbestos-free fiberboard or lead plate sealing methods, the ring seal not only maintains the simplicity of the structure but also achieves precise mechanical control of the end face gap value.

[0005] This utility model is implemented as follows: a horizontal gear pump end face sealing structure, the horizontal gear pump includes a pump body, a drive shaft and a driven shaft horizontally arranged inside the pump body, a drive gear and a driven gear respectively meshing on the drive shaft and the driven shaft, a shaft seal body and a rear cover respectively provided at the front and rear ends of the pump body, the shaft seal body is provided with a first annular mounting hole group, the shaft seal body is bolted to the pump body through the first annular mounting hole group, and a first return groove is provided on the shaft seal body facing the pump body side; the rear cover is provided with a second annular mounting hole group, the rear cover is bolted to the pump body through the second annular mounting hole group, and a second return groove is provided on the rear cover facing the pump body side; the end face sealing structure includes a first groove provided on the end face of the shaft seal body that fits against the pump body, the first groove being placed between the first annular mounting hole group and the first return groove, and a first sealing element being provided in the first groove;

[0006] A second groove is provided on the end face of the rear cover that fits into the pump body. The second groove is located between the second annular mounting hole group and the second return groove. A second sealing element is provided in the second groove.

[0007] Furthermore, the drive end of the drive shaft passes through the shaft seal and extends outward, and an oil seal sleeved on the drive shaft is provided inside the shaft seal.

[0008] Furthermore, a lubrication ring is embedded in the shaft seal body, and a constant position oil cup is provided on the shaft seal body. An oiling notch is provided on the lubrication ring relative to the installation position of the constant position oil cup, and the constant position oil cup is connected to the oiling notch through a lubrication channel.

[0009] Furthermore, the oil seal is a skeleton oil seal, and two skeleton oil seals are arranged along the axial direction of the drive shaft.

[0010] Furthermore, both the first groove and the second groove are annular grooves, and both the first seal and the second seal are O-rings.

[0011] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, the end-face sealing method is changed from oil-absorbing and swelling oil-resistant asbestos-free fiberboard or lead plate to a ring seal, aiming to improve the overall performance and operational stability of the pump unit. Compared with the traditional oil-absorbing and swelling oil-resistant asbestos-free fiberboard or lead plate sealing method, the ring seal not only maintains the simplicity of the structure, but also achieves precise mechanical control of the end-face gap value. This transformation significantly enhances the performance of the pump unit. Its core advantages are reflected in the following aspects:

[0012] 1. Simplified structure and convenient assembly: The O-ring seal design greatly simplifies the end face sealing structure, reduces assembly steps, eliminates the need to cut gaskets, and allows for direct assembly, thereby saving time and improving assembly efficiency.

[0013] 2. Precise gap control: The end face gap is precisely guaranteed by machining, which completely eliminates the influence of dimensional differences caused by gasket compression and swelling on the gap value, ensuring the accuracy of the gap size, thereby improving the sealing performance and operational stability of the pump unit.

[0014] 3. Improved sealing reliability: The structure design of the double oil seal not only enhances the anti-leakage capability of the pump unit during operation, but also improves the reliability of the seal, ensuring effective isolation of the medium.

[0015] 4. Lubrication optimization: The lubrication ring design embedded in the two oil seals provides the necessary grease to the pump unit, effectively reducing friction and wear and extending the service life of the pump unit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the horizontal gear pump provided in this embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the end face structure of the shaft seal body provided in this embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the rear cover end face structure provided in an embodiment of this utility model.

[0019] In the diagram: 1. Pump body; 2. Shaft seal body; 2-1. First annular mounting hole group; 2-2. First reflux groove; 2-3. First groove; 3. Rear cover; 3-1. Second annular mounting hole group; 3-2. Second reflux groove; 3-3. Second groove; 4. Drive shaft; 5. Driven shaft; 6. First seal; 7. Second seal; 8. Oil seal; 9. Lubrication ring; 9-1. Oil filling notch; 10. Constant position oil cup. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0021] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1 to 3As shown, this application provides a horizontal gear pump end face sealing structure. The horizontal gear pump includes a pump body 1. A drive shaft 4 and a driven shaft 5 are horizontally arranged inside the pump body 1. A drive gear and a driven gear that mesh with each other are respectively arranged on the drive shaft 4 and the driven shaft 5. A shaft seal body 2 and a rear cover 3 are respectively arranged at the front and rear ends of the pump body 1. A first annular mounting hole group 2-1 is provided on the shaft seal body 2. The shaft seal body 2 is bolted to the pump body 1 through the first annular mounting hole group 2-1. A first return groove 2-2 is provided on the shaft seal body 2 facing the pump body 1. A second annular mounting hole group 3-1 is provided on the rear cover 3. The rear cover 3 is bolted to the pump body 1 through the second annular mounting hole group 3-1. A second return groove 3-2 is provided on the rear cover 3 facing the pump body 1.

[0023] The end-face sealing structure includes a first groove 2-3 on the end face of the shaft seal 2 that fits against the pump body 1. The first groove 2-3 is located between the first annular mounting hole group 2-1 and the first return groove 2-2, and a first sealing element 6 is disposed within the first groove 2-3. A second groove is provided on the end face of the rear cover 3 that fits against the pump body 1. The second groove is located between the second annular mounting hole group 3-1 and the second return groove 3-2, and a second sealing element 7 is disposed within the second groove. Specifically, both the first groove 2-3 and the second groove are annular grooves, and both the first sealing element 6 and the second sealing element 7 are O-rings.

[0024] The drive end of the drive shaft 4 passes through the shaft seal body 2 and extends outward. An oil seal 8 is sleeved on the drive shaft inside the shaft seal body 2. Preferably, the oil seal 8 is a skeleton oil seal, and two skeleton oil seals are arranged along the axial direction of the drive shaft. This dual-oil seal sealing system, with a dual-pressure oil seal structure, provides double protection.

[0025] The shaft seal body 2 has a lubrication ring 9 embedded within it, specifically positioned between two oil seals 8. A constant-position oil cup 10 is provided on the shaft seal body 2. A lubrication notch 9-1 is provided on the lubrication ring 9 relative to the installation position of the constant-position oil cup 10. The constant-position oil cup 10 is connected to the lubrication notch 9-1 via a lubrication channel. The structure of the constant-position oil cup ensures lubrication of the oil seals during operation and allows for monitoring of the oil seal's operating status during pump unit operation through oil level observation, thereby improving the reliability, maintainability, and safety of the pump unit.

[0026] By adopting the above technical solution, the end-face sealing method has been changed from oil-absorbing and swelling oil-resistant asbestos-free fiberboard or lead plate to a ring seal, aiming to improve the overall performance and operational stability of the pump unit. Compared with the traditional oil-absorbing and swelling oil-resistant asbestos-free fiberboard or lead plate sealing method, the ring seal not only maintains the simplicity of the structure, but also achieves precise mechanical control of the end-face gap value. This transformation significantly enhances the performance of the pump unit. Its core advantages are reflected in the following aspects:

[0027] 1. Simplified structure and convenient assembly: The O-ring seal design greatly simplifies the end face sealing structure, reduces assembly steps, eliminates the need to cut gaskets, and allows for direct assembly, thereby saving time and improving assembly efficiency.

[0028] 2. Precise gap control: The end face gap is precisely guaranteed by machining, which completely eliminates the influence of dimensional differences caused by gasket compression and swelling on the gap value, ensuring the accuracy of the gap size, thereby improving the sealing performance and operational stability of the pump unit.

[0029] 3. Improved sealing reliability: The structure design of the double oil seal not only enhances the anti-leakage capability of the pump unit during operation, but also improves the reliability of the seal, ensuring effective isolation of the medium.

[0030] 4. Lubrication optimization: The lubrication ring design embedded in the two oil seals provides the necessary grease to the pump unit, effectively reducing friction and wear and extending the service life of the pump unit.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 horizontal gear pump end face sealing structure, the horizontal gear pump comprising a pump body, a drive shaft and a driven shaft horizontally arranged within the pump body, a meshing drive gear and a driven gear respectively arranged on the drive shaft and the driven shaft, a shaft seal body and a rear cover respectively arranged at the front and rear ends of the pump body, the shaft seal body having a first annular mounting hole group, the shaft seal body being bolted to the pump body through the first annular mounting hole group, and a first return groove being provided on the shaft seal body facing the pump body side; the rear cover having a second annular mounting hole group, the rear cover being bolted to the pump body through the second annular mounting hole group, and a second return groove being provided on the rear cover facing the pump body side; characterized in that, The end face sealing structure includes a first groove provided on the end face of the shaft seal body that fits into the pump body. The first groove is located between the first annular mounting hole group and the first return groove. A first sealing element is provided in the first groove. A second groove is provided on the end face of the rear cover that fits into the pump body. The second groove is located between the second annular mounting hole group and the second return groove. A second sealing element is provided in the second groove.

2. The horizontal gear pump end face sealing structure according to claim 1, characterized in that, The drive end of the drive shaft passes through the shaft seal and extends outward, and an oil seal is provided inside the shaft seal and sleeved on the drive shaft.

3. The horizontal gear pump end face sealing structure according to claim 2, characterized in that, The shaft seal body has a lubrication ring embedded in it, and a constant position oil cup is provided on the shaft seal body. The lubrication ring is provided with an oiling notch relative to the installation position of the constant position oil cup. The constant position oil cup is connected to the oiling notch through a lubrication channel.

4. The horizontal gear pump end face sealing structure according to claim 2, characterized in that, The oil seal is a skeleton oil seal, and two skeleton oil seals are arranged along the axial direction of the drive shaft.

5. The horizontal gear pump end face sealing structure according to claim 1, characterized in that, Both the first groove and the second groove are annular grooves, and both the first seal and the second seal are O-rings.

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