Gear pump with bidirectional sealing structure

Abstract

The utility model discloses a gear pump with a bidirectional sealing structure, which comprises a gear pump main body, an oil inlet and an oil outlet on the side wall of the gear pump main body are connected with a conduit connecting structure, and the conduit connecting structure is internally connected with a bidirectional sealing structure. The two-way sealing structure is arranged in an inner cavity of the guide pipe connecting structure, an oil guide pipe is connected in the inner cavity of the guide pipe connecting structure and located on one side of the two-way sealing structure, and the two-way sealing structure comprises a fixed connecting ring. By means of the design that a spring seat, a movable connecting ring and a bidirectional sealing ring in the bidirectional sealing structure and interaction among all components are utilized to prevent oil leakage, in the using process of the gear pump with the bidirectional sealing structure, the deformation of the bidirectional sealing ring can be larger along with increase of oil pressure, and the service life of the gear pump is prolonged. Therefore, a better oil leakage prevention effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a gear pump with a bidirectional sealing structure. Background Art

[0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. It consists of two closed spaces, two gears, a pump body, and front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged changes from small to large, forming a vacuum, sucking in the liquid, and the volume of the space on the side where the gears are meshing changes from large to small, squeezing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of the gear pump depends entirely on the size of the resistance at the pump outlet.

[0003] The gear pump has a large leakage. When the external gear is running, there are three leakage paths: one is the gear top clearance, the second is the measuring clearance, and the third is the meshing clearance. Among them, the end face side clearance leakage is larger, accounting for 80%-85% of the total leakage. When the pressure increases, the former will not change, but the deflection of the latter will increase greatly. This is the main reason for the leakage of the external gear pump, and the volumetric efficiency is low.

[0004] In order to reduce leakage, existing gear pumps usually have sealing rings on the middle pipe interface, but the sealing rings are easily damaged during use, especially in the process of conveying high-temperature fluids, which greatly reduces the service life of the sealing rings. At the same time, it is not very convenient to install the pipeline. Utility Model Content

[0005] In order to solve the problem of oil leakage on the pipe interface of the gear pump, which affects the normal operation of the gear pump, the utility model provides a gear pump with a bidirectional sealing structure to solve the above problem.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A gear pump with a bidirectional sealing structure comprises a gear pump body, an oil inlet and an oil outlet on a side wall of the gear pump body are connected with a conduit connection structure, a bidirectional sealing structure is connected in the conduit connection structure, and an oil guide pipe is connected in the inner cavity of the conduit connection structure and located on one side of the bidirectional sealing structure;

[0008] The bidirectional sealing structure includes a fixed connecting ring, a plurality of spring seats are connected to the left side wall of the fixed connecting ring, a movable connecting ring is connected to the other end face of the spring seat, a bidirectional sealing ring is connected to the left side wall of the movable connecting ring, a shuttle-shaped sealing ring is arranged on the outer side wall of the bidirectional sealing ring, and flexible sealing rings are arranged on the inner and outer side walls of the movable connecting ring and the outer side wall of the fixed connecting ring.

[0009] As a preferred solution of the utility model, the conduit connection structure includes a pipe connecting seat, which is connected to the oil inlet and the oil outlet on the side wall of the gear pump body. Multiple groups of U-shaped grooves are opened on the side wall of the pipe connecting seat, and a fixed spiral tube is connected to the outer wall of the pipe connecting seat.

[0010] As a preferred solution of the utility model, the oil guide pipe is connected to the inner cavity of the pipeline connector, and the fixed connection ring is connected to the inner cavity of the pipeline connector, wherein the outer wall of the fixed connection ring and the inner wall of the pipeline connector are matched in a clearance fit.

[0011] As a preferred solution of the utility model, the spring seats are provided in six groups, wherein the six groups of spring seats are evenly arranged on the left side wall of the fixed connecting ring.

[0012] As a preferred solution of the utility model, sealing grooves are provided on the inner and outer side walls of the movable connecting ring and the outer side wall of the fixed connecting ring and corresponding to the flexible sealing ring, and the bidirectional sealing ring and the shuttle-shaped sealing ring are an integrated structure.

[0013] As a preferred solution of the utility model, elastic grooves are provided on the left side wall and the inner side wall of the bidirectional sealing ring, and a connecting groove is provided on the right side wall of the bidirectional sealing ring corresponding to the boss of the movable connecting ring, wherein the boss of the movable connecting ring and the connecting groove are matched in a clearance fit.

[0014] As a preferred solution of the utility model, the connection method between the pipe connector and the gear pump body is a threaded connection, and an inclined guide surface is correspondingly provided on the side wall where the pipe connector and the fixed spiral tube are in contact, and the connection method between the pipe connector and the fixed spiral tube is a threaded connection.

[0015] The utility model sets a two-way sealing structure, thereby utilizing the interaction between the spring seat, the movable connecting ring, the two-way sealing ring and various components in the two-way sealing structure to prevent oil leakage. As a result, during the use of the gear pump with the two-way sealing structure, as the oil pressure increases, the deformation of the two-way sealing ring is increased, thereby achieving a better effect of preventing oil leakage.

[0016] The utility model provides a conduit connection structure, thereby utilizing the interaction between the conduit connection seat, the fixed spiral tube and various components in the conduit connection structure, and facilitating the installation of the oil guide pipe, thereby making it more convenient to install the oil guide pipe during the use of the gear pump with a two-way sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front and side structures of the utility model;

[0018] Figure 2 For this utility model Figure 1 Schematic diagram of the cross-section structure;

[0019] Figure 3 This is a schematic diagram of the structure of the bidirectional sealing structure of the utility model;

[0020] Figure 4 For this utility model Figure 3 Schematic diagram of explosion structure;

[0021] Figure 5 For this utility model Figure 4 Schematic diagram of the cross-section structure;

[0022] Figure 6 It is a structural schematic diagram of the catheter connection structure of the utility model;

[0023] Figure 7 For this utility model Figure 6 Schematic diagram of the cross-section structure;

[0024] Figure 8 It is a structural schematic diagram of the pipeline connection seat of the utility model.

[0025] In the figure: 1. gear pump body; 2. conduit connection structure; 3. bidirectional sealing structure; 4. oil guide pipe; 201. pipeline connection seat; 202. U-shaped groove; 203. fixed spiral tube; 301. fixed connecting ring; 302. spring seat; 303. movable connecting ring; 304. bidirectional sealing ring; 305. shuttle sealing ring; 306. flexible sealing ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] For example, please refer to Figure 1-8 , the utility model provides a technical solution:

[0028] A gear pump with a bidirectional sealing structure comprises a gear pump body 1, an oil inlet and an oil outlet on the side wall of the gear pump body 1 are connected to a conduit connecting structure 2, a bidirectional sealing structure 3 is connected in the conduit connecting structure 2, and an oil guide pipe 4 is connected in the inner cavity of the conduit connecting structure 2 and on one side of the bidirectional sealing structure 3.

[0029] In this embodiment, reference Figure 1 , Figure 2 , Figure 3 and Figure 5 The bidirectional sealing structure 3 includes a fixed connecting ring 301, a plurality of spring seats 302 are connected to the left side wall of the fixed connecting ring 301, a movable connecting ring 303 is connected to the other end face of the spring seat 302, a bidirectional sealing ring 304 is connected to the left side wall of the movable connecting ring 303, a shuttle-shaped sealing ring 305 is arranged on the outer side wall of the bidirectional sealing ring 304, and flexible sealing rings 306 are arranged on the inner and outer side walls of the movable connecting ring 303 and the outer side wall of the fixed connecting ring 301.

[0030] Based on the above structure and the connection relationship of the above structure, during use, when the oil volume is too large, the oil will overflow from the gap between the oil guide pipe 4 and the pipeline connecting seat 201, causing the oil to overflow between the fixed connecting ring 301 and the movable connecting ring 303. At this time, the pressure between the fixed connecting ring 301 and the movable connecting ring 303 increases, causing the movable connecting ring 303 to move to one side of the oil guide pipe 4, and at the same time causing the two-way sealing ring 304 and the oil guide pipe 4 to be squeezed and deformed, thereby improving the sealing effect of the device and preventing oil leakage.

[0031] The oil guide pipe 4 is connected to the inner cavity of the pipeline connecting seat 201, and the fixed connecting ring 301 is connected to the inner cavity of the pipeline connecting seat 201, wherein the outer wall of the fixed connecting ring 301 and the inner wall of the pipeline connecting seat 201 are matched in a clearance fit, and six groups of spring seats 302 are arranged, wherein the six groups of spring seats 302 are evenly arranged on the left side wall of the fixed connecting ring 301, and sealing grooves are provided on the inner and outer walls of the movable connecting ring 303 and the outer wall of the fixed connecting ring 301 corresponding to the flexible sealing ring 306, and the bidirectional sealing ring 304 and the shuttle-shaped sealing ring 305 are an integrated structure, and elastic grooves are provided on the left side wall and the inner side wall of the bidirectional sealing ring 304, and a connecting groove is provided on the right side wall of the bidirectional sealing ring 304 corresponding to the boss of the movable connecting ring 303, wherein the boss of the movable connecting ring 303 and the connecting groove are matched in a clearance fit, which makes the device more convenient when used.

[0032] In this embodiment, reference Figure 1 , Figure 2 , Figure 7 and Figure 8 The conduit connection structure 2 includes a pipe connection seat 201, which is connected to the oil inlet and the oil outlet on the side wall of the gear pump body 1. A plurality of groups of U-shaped grooves 202 are provided on the side wall of the pipe connection seat 201, and a fixed spiral tube 203 is connected to the outer wall of the pipe connection seat 201.

[0033] Based on the above structure and the connection relationship of the above structure, the oil guide pipe 4 is installed in the pipe connecting seat 201, and the oil guide pipe 4 is fixed by rotating the fixed screw 203; the connection method between the pipe connecting seat 201 and the gear pump body 1 is a threaded connection, and an inclined guide surface is correspondingly provided on the side wall where the pipe connecting seat 201 and the fixed screw 203 are in contact. The connection method between the pipe connecting seat 201 and the fixed screw 203 is a threaded connection, which makes the device smoother when in use.

[0034] In the present utility model gear pump, an inclined guide surface is correspondingly provided on the side wall where the pipe connection seat 201 contacts the fixed screw 203. The pipe connection seat 201 and the fixed screw 203 are connected in a threaded manner, and the oil guide pipe 4 is installed in the pipe connection seat 201, and the fixed screw 203 is rotated to fix the oil guide pipe 4.

[0035] When the oil volume is too large, the oil will overflow from the gap between the oil guide pipe 4 and the pipe connecting seat 201, causing the oil to overflow to between the fixed connecting ring 301 and the movable connecting ring 303. At this time, the pressure between the fixed connecting ring 301 and the movable connecting ring 303 increases, causing the movable connecting ring 303 to move to one side of the oil guide pipe 4. At the same time, a sealing groove is provided on the inner and outer walls of the movable connecting ring 303 and the outer wall of the fixed connecting ring 301, corresponding to the flexible sealing ring 306. The bidirectional sealing ring 304 and the shuttle-shaped sealing ring 305 are an integrated structure. Elastic grooves are provided on the left and inner walls of the bidirectional sealing ring 304. A connecting groove is provided on the right wall of the bidirectional sealing ring 304, corresponding to the boss of the mobile connecting ring 303. The boss of the mobile connecting ring 303 and the connecting groove are matched in a clearance match, so that the bidirectional sealing ring 304 and the oil guide pipe 4 are squeezed and deformed, thereby improving the sealing effect of the device and preventing oil leakage.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gear pump with a bidirectional sealing structure, comprising a gear pump body (1), characterized in that: The oil inlet and the oil outlet on the side wall of the gear pump body (1) are connected to a conduit connection structure (2), a bidirectional sealing structure (3) is connected to the conduit connection structure (2), and an oil guide pipe (4) is connected to the inner cavity of the conduit connection structure (2) and located on one side of the bidirectional sealing structure (3); The bidirectional sealing structure (3) comprises a fixed connecting ring (301), a plurality of groups of spring seats (302) are connected to the left side wall of the fixed connecting ring (301), a movable connecting ring (303) is connected to the other end surface of the spring seat (302), a bidirectional sealing ring (304) is connected to the left side wall of the movable connecting ring (303), a shuttle-shaped sealing ring (305) is arranged on the outer side wall of the bidirectional sealing ring (304), and flexible sealing rings (306) are arranged on the inner and outer side walls of the movable connecting ring (303) and the outer side wall of the fixed connecting ring (301).

2. A gear pump with a bidirectional sealing structure according to claim 1, characterized in that: The conduit connection structure (2) comprises a pipe connection seat (201), the pipe connection seat (201) being connected to an oil inlet and an oil outlet on a side wall of a gear pump body (1), a plurality of groups of U-shaped grooves (202) being provided on the side wall of the pipe connection seat (201), and a fixed spiral tube (203) being connected to an outer side wall of the pipe connection seat (201).

3. The gear pump with a bidirectional sealing structure according to claim 1, characterized in that: The oil guide pipe (4) is connected to the inner cavity of the pipeline connection seat (201), and the fixed connection ring (301) is connected to the inner cavity of the pipeline connection seat (201), wherein the outer wall of the fixed connection ring (301) and the inner wall of the pipeline connection seat (201) are matched in a clearance fit.

4. The gear pump with a bidirectional sealing structure according to claim 1, characterized in that: The spring seats (302) are provided in six groups, wherein the six groups of spring seats (302) are evenly arranged on the left side wall of the fixed connection ring (301).

5. The gear pump with a bidirectional sealing structure according to claim 1, characterized in that: Sealing grooves are provided on the inner and outer walls of the movable connecting ring (303) and the outer wall of the fixed connecting ring (301) and correspond to the flexible sealing ring (306). The bidirectional sealing ring (304) and the shuttle-shaped sealing ring (305) are an integrated structure.

6. The gear pump with a bidirectional sealing structure according to claim 1, characterized in that: The left side wall and the inner side wall of the bidirectional sealing ring (304) are both provided with elastic grooves, and the right side wall of the bidirectional sealing ring (304) is provided with a connecting groove corresponding to the boss of the movable connecting ring (303), wherein the boss of the movable connecting ring (303) and the connecting groove are matched in a clearance fit.

7. The gear pump with a bidirectional sealing structure according to claim 2, characterized in that: The pipe connection seat (201) and the gear pump body (1) are connected in a threaded manner, and an inclined guide surface is correspondingly provided on the side wall of the pipe connection seat (201) in contact with the fixed solenoid (203), and the pipe connection seat (201) and the fixed solenoid (203) are connected in a threaded manner.

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