Gear pump sealing mechanism

Abstract

This utility model discloses a gear pump sealing mechanism, relating to the field of sealing technology for fluid conveying equipment. The utility model includes a front cover and a pump body. The pump body is bolted to the side of the front cover, and a rear cover is bolted to the side of the pump body. A drive shaft is rotatably connected to the inner wall of the front cover. A sealing device is provided on the side of the front cover. The sealing device includes a sealing ring, a sealing cavity, a sealing cover, a pressure plate, a slide rail ring, a transmission rod, and a force-bearing ring. This utility model, through the sealing ring, sealing cover, pressure plate, and multiple sets of circumferentially arrayed transmission rods in the sealing device, combined with the L-shaped groove guidance of the slide rail ring, enables the sealing cover to receive uniform and stable pressure. Combined with the partitions in the sealing cavity forming multiple layers of barrier, it significantly improves the overall sealing performance of the gear pump, effectively prevents media leakage, and reduces the risk of equipment wear due to poor sealing. It also solves the problems of poor sealing adaptability and inaccurate installation positioning in existing equipment.

Description

Technical Field

[0001] This utility model belongs to the field of sealing technology for fluid conveying equipment, and in particular relates to a sealing mechanism for gear pumps. Background Technology

[0002] Gear pumps are hydraulic components that rely on the volume change caused by gear meshing to transport liquids. They are widely used in machinery manufacturing, petrochemicals, engineering machinery and other fields. Their sealing performance directly affects the working efficiency and service life of the pump body. Good sealing can prevent leakage of the transported medium, avoid air entering the pump cavity and causing cavitation, and reduce wear during gear meshing.

[0003] In existing equipment, sealing between the front cover and the pump body, and between the drive shaft and the end cover is achieved by a single sealing ring or gasket. Although this can meet basic sealing requirements, the sealing structure is fixed. After long-term use, the sealing ring is prone to wear or aging, which can lead to a decline in sealing performance. Moreover, replacement requires disassembling the pump body, which is cumbersome. Therefore, we have proposed a gear pump sealing mechanism. Utility Model Content

[0004] The purpose of this utility model is to provide a gear pump sealing mechanism, which solves the problems of easy degradation of sealing performance, inconvenient maintenance, poor pressure adaptability and inaccurate installation positioning of existing equipment by forming a sealing device consisting of a sealing ring, a sealing cavity, an adjustable sealing cover and a pressure plate.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a gear pump sealing mechanism, including: a front end cover and a pump body, the pump body is bolted to the side of the front end cover, the rear end cover is bolted to the side of the pump body, a drive shaft is rotatably connected to the inner wall of the front end cover, and a sealing device is provided on the side of the front end cover.

[0007] The sealing device includes a sealing ring, the outer circumferential surface of which is fixedly connected to the inner circumferential surface of the front end cover. A sealing cavity is formed on the inner circumferential surface of the front end cover. A sealing cover is provided at one end of the front end cover, and a pressure plate is provided at one end of the sealing cover. A slide rail ring is fixedly connected to one end of the front end cover near the sealing cover. A transmission rod is fixedly connected to one end of the pressure plate. The circumferential surface of the transmission rod is slidably connected to the inner wall of the slide rail ring. A force-bearing ring is fixedly connected to one end of the transmission rod.

[0008] Furthermore, the number of transmission rods is set to several and arranged in a circumferential array at one end of the pressure plate. The side of the sealing cover is in contact with the side of the pressure plate in the working position. The multiple transmission rods are evenly distributed, which can make the pressure of the pressure plate on the sealing cover be evenly transmitted in the circumferential direction, avoiding deformation of the sealing cover due to excessive local force, or local sealing failure due to uneven force.

[0009] Furthermore, the sealing cavity includes a first partition and a second partition, which are fixedly connected to the inner circumferential surface of the front end cover. The first partition and the second partition divide the sealing cavity into multiple layers of space, forming a labyrinthine sealing structure. When the medium attempts to leak through the sealing cavity, it needs to pass through multiple layers of barriers, which prolongs the leakage path and effectively reduces the risk of leakage.

[0010] Furthermore, the slide rail ring includes L-shaped grooves, the number of which is equal to the number of transmission rods, and they are arranged circumferentially on the circumferential surface of the slide rail ring. The L-shaped grooves provide precise guidance for the sliding direction of the transmission rods, ensuring that the transmission rods drive the pressure plate and the sealing cover to move smoothly along the axial direction, thus avoiding poor sealing caused by the offset of the sealing cover.

[0011] Furthermore, a positioning device is provided on the inner circumferential surface of the force-bearing ring. The positioning device includes a base, the side of which is fixedly connected to the inner circumferential surface of the force-bearing ring. A positioning rod is slidably connected to the inner wall of the base. A spring is provided on the circumferential surface of the positioning rod. A baffle is engaged at one end of the positioning rod. A through groove is provided on the circumferential surface of the slide rail ring.

[0012] Furthermore, one end of the spring is fixedly connected to the side of the baffle, and the other end of the spring is snapped onto the side of the base. The elastic force of the spring can act on the positioning rod through the baffle, so that the positioning rod always has the tendency to move in the direction of the through groove, ensuring that the positioning rod is stably snapped into the through groove in the non-adjustment state, realizing the reliable positioning of the force ring and the slide rail ring, and avoiding the sealing device from loosening due to vibration or medium pressure fluctuations.

[0013] Furthermore, the number of positioning devices is equal to the number of transmission rods. The positioning devices are arranged in a circumferential array on the inner circumferential surface of the force ring. Multiple positioning devices are evenly distributed, which can position the force ring from multiple points on the circumference, avoiding the force ring from tilting due to insufficient positioning on one side, ensuring the accurate installation position of components such as the sealing cover and pressure plate, and guaranteeing the sealing effect.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model, through the sealing ring, sealing cover, pressure plate and multiple sets of circumferential array transmission rods in the sealing device, combined with the L-shaped sliding groove guide of the slide rail ring, can make the sealing cover subject to uniform and stable pressure. Combined with the partition in the sealing cavity to form a multi-layer barrier, it significantly improves the overall sealing performance of the gear pump, effectively prevents media leakage, and reduces the risk of equipment wear caused by poor sealing.

[0016] 2. This utility model achieves reliable positioning of the sealing structure by cooperating with the spring and positioning rod in the positioning device. The number of positioning devices is the same as that of the transmission rod and they are arranged in a circumferential array. The elastic force of the spring can push the positioning rod into the through groove of the slide rail ring, fixing the force ring from multiple points. This ensures that the sealing cover, pressure plate and other sealing components are accurately positioned during installation and operation, and will not be displaced due to equipment vibration or medium pressure fluctuations.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the three-dimensional sealing device of this utility model;

[0021] Figure 3 This utility model Figure 2 A three-dimensional magnified structural diagram of A in the diagram;

[0022] Figure 4 This is a half-sectional structural diagram of the three-dimensional sealing device of this utility model;

[0023] Figure 5 This is a partial structural schematic diagram of the three-dimensional sealing device of this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Front cover; 2. Pump body; 3. Rear cover; 4. Drive shaft; 5. Sealing device; 501. Sealing ring; 502. Sealing cavity; 503. Sealing cover; 504. Pressure plate; 505. Slide rail ring; 506. Transmission rod; 507. Force-bearing ring; 508. Partition 1; 509. Partition 2; 6. Positioning device; 601. Base; 602. Positioning rod; 603. Spring; 604. Baffle; 605. Through groove. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-4 This utility model is a gear pump sealing mechanism, including: a front cover 1 and a pump body 2. The pump body 2 is bolted to the side of the front cover 1, and the rear cover 3 is bolted to the side of the pump body 2. A drive shaft 4 is rotatably connected to the inner wall of the front cover 1, and a sealing device 5 is provided on the side of the front cover 1.

[0028] The sealing device 5 includes a sealing ring 501. The outer circumferential surface of the sealing ring 501 is fixedly connected to the inner circumferential surface of the front end cover 1. A sealing cavity 502 is formed on the inner circumferential surface of the front end cover 1. A sealing cover 503 is provided at one end of the front end cover 1. A pressure plate 504 is provided at one end of the sealing cover 503. A slide rail ring 505 is fixedly connected to one end of the front end cover 1 near the sealing cover 503. A transmission rod 506 is fixedly connected to one end of the pressure plate 504. The circumferential surface of the transmission rod 506 is slidably connected to the inner wall of the slide rail ring 505. A force-bearing ring 507 is fixedly connected to one end of the transmission rod 506.

[0029] As shown in the figure, there are several transmission rods 506 arranged in a circumferential array at one end of the pressure plate 504. The side of the sealing cover 503 is in contact with the side of the pressure plate 504 in the working position. The multiple transmission rods 506 are evenly distributed, which can make the pressure of the pressure plate 504 on the sealing cover 503 evenly transmitted in the circumferential direction, avoiding deformation of the sealing cover 503 due to excessive local force, or local sealing failure due to uneven force.

[0030] As shown in the figure, the sealing cavity 502 includes a first partition 508 and a second partition 509. The first partition 508 and the second partition 509 are fixedly connected to the inner circumferential surface of the front end cover 1. The first partition 508 and the second partition 509 divide the sealing cavity 502 into multiple spaces, forming a labyrinth-type sealing structure. When the medium attempts to leak through the sealing cavity 502, it needs to pass through multiple layers of barriers, which prolongs the leakage path and effectively reduces the risk of leakage.

[0031] As shown in the figure, the slide rail ring 505 includes L-shaped grooves. The number of L-shaped grooves in the slide rail ring 505 is equal to the number of transmission rods 506, and they are arranged circumferentially on the circumferential surface of the slide rail ring 505. The L-shaped grooves provide precise guidance for the sliding direction of the transmission rods 506, ensuring that the transmission rods 506 drive the pressure plate 504 and the sealing cover 503 to move smoothly along the axial direction, and avoiding poor sealing caused by the offset of the sealing cover 503.

[0032] As shown in the figure, a positioning device 6 is provided on the inner circumferential surface of the force ring 507. The positioning device 6 includes a base 601. The side of the base 601 is fixedly connected to the inner circumferential surface of the force ring 507. A positioning rod 602 is slidably connected to the inner wall of the base 601. A spring 603 is provided on the circumferential surface of the positioning rod 602. A baffle 604 is engaged at one end of the positioning rod 602. A through groove 605 is opened on the circumferential surface of the slide rail ring 505.

[0033] As shown in the figure, one end of the spring 603 is fixedly connected to the side of the baffle 604, and the other end of the spring 603 is snapped into the side of the base 601. The elastic force of the spring 603 can act on the positioning rod 602 through the baffle 604, so that the positioning rod 602 always has the tendency to move towards the through groove 605, ensuring that the positioning rod 602 is stably snapped into the through groove 605 in the non-adjusted state, realizing the reliable positioning of the force ring 507 and the slide rail ring 505, and preventing the sealing device 5 from loosening due to vibration or medium pressure fluctuation.

[0034] As shown in the figure, the number of positioning devices 6 is equal to the number of transmission rods 506. The positioning devices 6 are arranged in a circumferential array on the inner circumferential surface of the force ring 507. Multiple positioning devices 6 are evenly distributed, which can position the force ring 507 from multiple points on the circumference, avoid the force ring 507 from being tilted due to insufficient positioning on one side, ensure the accurate installation position of components such as the sealing cover 503 and the pressure plate 504, and ensure the sealing effect.

[0035] A specific application of this embodiment is as follows: When the gear pump is used to transport high-temperature and viscous crude oil or chemical raw materials, leakage is likely to occur at the joint between the drive shaft 4 and the front cover 1 due to the high viscosity of the medium and large pressure fluctuations. At this time, the sealing ring 501 in the sealing device 5 forms an initial seal by tightly adhering to the inner circumferential surface of the front cover 1. The partition 508 and partition 509 in the sealing cavity 502 separate the potentially leaking medium into multiple layers of space, extending the leakage path. At the same time, the force ring 507 drives the pressure plate 504 to press the sealing cover 503 through the transmission rod 506, and the L-shaped slide rail ring 505... The groove ensures that the transmission rod 506 applies force smoothly along the axial direction, so that the sealing cover 503 fits evenly against the front cover 1, avoiding the formation of local gaps. In the positioning device 6, the spring 603 pushes the positioning rod 602 into the through groove 605 of the slide rail ring 505, locking the position of the force ring 507 and preventing the sealing pressure from dropping due to equipment vibration. Even if the temperature of the medium changes and causes the components to expand and contract, the multiple circumferential arrays of transmission rods 506 and positioning device 6 can still ensure the fitting accuracy of the sealing cover 503 and the front cover 1, effectively preventing the leakage of viscous media and ensuring the safe and stable operation of the conveying system.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A gear pump sealing mechanism comprising a front end cover (1) and a pump body (2), characterized in that: The pump body (2) is bolted to the side of the front cover (1), the rear cover (3) is bolted to the side of the pump body (2), the drive shaft (4) is rotatably connected to the inner wall of the front cover (1), and a sealing device (5) is provided on the side of the front cover (1). The sealing device (5) includes a sealing ring (501), the outer circumferential surface of the sealing ring (501) is fixedly connected to the inner circumferential surface of the front end cover (1), the inner circumferential surface of the front end cover (1) is provided with a sealing cavity (502), one end of the front end cover (1) is provided with a sealing cover (503), one end of the sealing cover (503) is provided with a pressure plate (504), one end of the front end cover (1) near the sealing cover (503) is fixedly connected with a slide rail ring (505), one end of the pressure plate (504) is fixedly connected with a transmission rod (506), the circumferential surface of the transmission rod (506) is slidably connected to the inner wall of the slide rail ring (505), and one end of the transmission rod (506) is fixedly connected with a force-bearing ring (507).

2. The gear pump sealing mechanism of claim 1, wherein, The number of transmission rods (506) is set to several and arranged in a circumferential array at one end of the pressure plate (504). The side of the sealing cover (503) is in contact with the side of the pressure plate (504) in the working position.

3. The gear pump sealing mechanism of claim 1, wherein, The sealed cavity (502) includes a first partition (508) and a second partition (509), which are fixedly connected to the inner circumferential surface of the front end cover (1).

4. The gear pump sealing mechanism of claim 1, wherein, The slide rail ring (505) includes L-shaped grooves. The number of L-shaped grooves in the slide rail ring (505) is equal to the number of transmission rods (506), and they are arranged circumferentially on the circumferential surface of the slide rail ring (505).

5. The gear pump sealing mechanism of claim 1, wherein, The inner circumferential surface of the force-bearing ring (507) is provided with a positioning device (6). The positioning device (6) includes a base (601). The side of the base (601) is fixedly connected to the inner circumferential surface of the force-bearing ring (507). A positioning rod (602) is slidably connected to the inner wall of the base (601). A spring (603) is provided on the circumferential surface of the positioning rod (602). A baffle (604) is snapped onto one end of the positioning rod (602). A through groove (605) is opened on the circumferential surface of the slide rail ring (505).

6. The gear pump sealing mechanism of claim 5, wherein, One end of the spring (603) is fixedly connected to the side of the baffle (604), and the other end of the spring (603) is snapped onto the side of the base (601).

7. The gear pump sealing mechanism of claim 5, wherein, The number of positioning devices (6) is equal to the number of transmission rods (506), and the positioning devices (6) are arranged in a circumferential array on the inner circumferential surface of the force ring (507).

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