Bidirectional mechanical sealing structure of gear pump

Abstract

The utility model discloses a bidirectional mechanical sealing structure of a gear pump, which comprises a shell and a shaft sleeve, and the shaft sleeve is mounted in the shell; the lip seal assembly is installed between the shaft sleeve and the interior of the shell and comprises a one-way lip piece and a plurality of two-way lip pieces, isolation pieces are arranged between the one-way lip piece and the two-way lip pieces and between the two-way lip pieces, each two-way lip piece comprises a main body part, a first lip piece and a second lip piece, and the first lip piece and the second lip piece are symmetrically arranged with the main body part as the axis. The bottoms of the first lip piece and the second lip piece abut against the outer wall of the shaft sleeve, and the top end of the main body part abuts against the inner wall of the shell. The gear pump mechanical seal has the advantages that the sealing mode of the two-way lip pieces is adopted, the sealing performance and the two-way bearing pressure are improved, the sealing performance of the gear pump mechanical seal during operation is improved, leakage is reduced, and the influence of leakage on the environment during equipment operation is reduced; meanwhile, the outer wall of the shaft sleeve is coated with a wear-resistant material, the friction coefficient is reduced, and wear resistance and sealing performance are improved.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a bidirectional mechanical seal structure for a gear pump. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] Currently, existing lip-type mechanical seals are subject to unidirectional force and unidirectional sealing, which often leads to material leakage due to wear, gelation, and other issues.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a bidirectional mechanical seal structure for a gear pump, which addresses the shortcomings of the prior art by adopting a bidirectional lip seal, thereby improving sealing performance and bidirectional pressure resistance, enhancing the sealing performance of the gear pump mechanical seal during operation, reducing leakage, and minimizing the environmental impact of leakage during equipment operation; at the same time, a wear-resistant material coating is applied to the outer wall of the bushing to reduce the coefficient of friction and improve wear resistance and sealing performance.

[0006] This application discloses a bidirectional mechanical seal structure for a gear pump, comprising:

[0007] case;

[0008] A bushing, which is installed inside the housing;

[0009] A lip sealing assembly is installed between the bushing and the housing. The lip sealing assembly includes a unidirectional lip and multiple bidirectional lips, and isolation plates are provided between the unidirectional lip and the bidirectional lip, and between adjacent bidirectional lips. The bidirectional lip includes a main body and a first lip and a second lip symmetrically arranged about the main body as an axis. The bottom of the first lip and the second lip abuts against the outer wall of the bushing, and the top of the main body abuts against the inner wall of the housing.

[0010] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, both the unidirectional and bidirectional lip plates are annular structures.

[0011] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, the first lip and the second lip form a "V" shaped structure.

[0012] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, the lip seal assembly is made of fluorosilicone rubber or fluoroether rubber.

[0013] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, the surface coating of the bushing is made of aluminum oxide.

[0014] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, a flange block is provided between the bushing and the housing, and the flange block is connected to the housing by bolts.

[0015] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, the bushing near the outer wall of the flange block is provided with a limiting part. The limiting part is connected to the bushing by bolts and can radially limit the flange block.

[0016] Furthermore, in the aforementioned bidirectional mechanical seal structure of the gear pump, a sealing ring is also provided between the outer wall of the bushing away from the flange block and the housing.

[0017] In summary, the structure adopted in this embodiment of the present invention has the following advantages:

[0018] 1. The bidirectional mechanical seal structure of the gear pump described in this utility model adopts a bidirectional lip seal, which increases the sealing performance under bidirectional force and improves the sealing effect of the mechanical seal under positive and negative pressure. It can significantly extend the service life of the mechanical seal equipment, improve the sealing performance of the gear pump mechanical seal during operation, reduce leakage, reduce the impact of leakage on the environment during equipment operation, effectively prevent material leakage, and prevent safety accidents.

[0019] 2. The bidirectional mechanical seal structure of the gear pump described in this utility model performs surface plating treatment on the bushing, which can improve the surface smoothness of the bushing, reduce roughness and friction coefficient, and improve installation accuracy. On the one hand, it can improve the service life of the bushing, and on the other hand, it can improve the installation accuracy of the mechanical seal, thereby improving the sealing performance.

[0020] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings provided are for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of the bidirectional mechanical seal structure of the gear pump in this embodiment of the present invention;

[0023] Figure 2 This is a side view of the bidirectional mechanical seal structure of the gear pump in this embodiment of the present invention.

[0024] The reference numerals in the above figures are as follows: 1. Housing; 2. Bushing; 3. One-way lip; 4. Two-way lip; 41. Main body; 42. First lip; 43. Second lip; 5. Isolation plate; 6. Flange block; 7. Limiting part; 8. Sealing ring; 9. Bolt. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustration only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0027] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another or one signal from another. Additionally, the term "or" used herein should, depending on the actual situation, possibly include any combination of one or more of the associated listed items.

[0028] Referring to Figures 1 to 2 As shown, an embodiment of the present application discloses a two-way mechanical seal structure for a gear pump, including:

[0029] A housing 1;

[0030] A shaft sleeve, the shaft sleeve is installed inside the housing 1;

[0031] A lip seal assembly, the lip seal assembly is installed between the shaft sleeve and the inside of the housing 1, the lip seal assembly includes a one-way lip 3 and multiple two-way lips 4, and isolation sheets 5 are provided between the one-way lip 3 and the two-way lips 4 and between adjacent two-way lips 4. The two-way lip 4 includes a main body portion 41, a first lip 42 and a second lip 43 symmetrically arranged with the main body portion 41 as the axis. The bottoms of the first lip 42 and the second lip 43 abut against the outer wall of the shaft sleeve, and the top of the main body portion 41 abuts against the inner wall of the housing 1.

[0032] With the above structure, the sealing form of two-way lips is adopted, increasing the sealing performance of two-way force, enhancing the sealing effect when the mechanical seal is under positive pressure and negative pressure, and can greatly improve the service life of the mechanical seal and the tolerance range of the mechanical seal under different viscosity grades during the operation of the gear pump; improving the sealing performance and two-way pressure resistance, enhancing the sealing performance during the operation of the mechanical seal of the gear pump, reducing leakage, reducing the impact of leakage during equipment operation on the environment, effectively preventing material leakage, and preventing safety accidents.

[0033] Specifically, in this embodiment, both the one-way lip 3 and the two-way lips 4 are of an annular structure. The one-way lip 3 and the two-way lips 4 are both sleeved on the outer wall of the shaft sleeve, and together with multiple isolation sheets 5, they achieve the sealing performance.

[0034] Specifically, in this embodiment, the first lip 42 and the second lip 43 form a "person" - shaped structure, that is, the cross - section of the two-way lip is a "person" - shaped structure.

[0035] Specifically, in this embodiment, the lip seal assembly is made of fluorosilicone rubber or fluorinated ether rubber.

[0036] Specifically, in this embodiment, the surface coating of the bushing is made of aluminum oxide. Surface coating treatment of the bushing can improve the surface smoothness, reduce roughness and the coefficient of friction, and improve installation accuracy. This extends the service life of the bushing and also improves the installation accuracy of the mechanical seal, thereby enhancing sealing performance.

[0037] Specifically, in this embodiment, a flange block 6 is provided between the bushing 2 and the housing 1, and the flange block 6 is connected to the housing 1 by bolts 9.

[0038] Specifically, in this embodiment, the bushing 2 is provided with a limiting part 7 near the outer wall of the flange block 6. The limiting part 7 is connected to the bushing 2 by bolts 9 and can radially limit the flange block 6.

[0039] Specifically, in this embodiment, a sealing ring 8 is provided between the outer wall of the bushing 2 away from the flange block and the housing 1, which can further enhance the sealing performance of the mechanical seal structure.

[0040] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

[0041] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0042] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A bidirectional mechanical seal structure for a gear pump, characterized in that, Comprising: A housing; A bushing, which is installed inside the housing; A lip seal assembly, which is installed between the bushing and the inside of the housing. The lip seal assembly includes a one-way lip and multiple two-way lips, and spacer sheets are provided between the one-way lip and the two-way lips and between adjacent two-way lips. The two-way lip includes a main body portion, a first lip and a second lip symmetrically arranged with the main body portion as the axis. The bottoms of the first lip and the second lip abut against the outer wall of the bushing, and the top of the main body portion abuts against the inner wall of the housing.

2. The bidirectional mechanical seal structure of the gear pump according to claim 1, characterized in that, Both the one-way lip and the two-way lips are of an annular structure.

3. The bidirectional mechanical seal structure of the gear pump according to claim 1, characterized in that, The first lip and the second lip form a "human" character structure.

4. The bidirectional mechanical seal structure of the gear pump according to claim 1, characterized in that, The lip seal assembly is made of fluorosilicone rubber or fluoroether rubber.

5. The bidirectional mechanical seal structure of the gear pump according to claim 1, characterized in that, The surface coating of the bushing is made of alumina material.

6. The bidirectional mechanical seal structure of the gear pump according to claim 1, characterized in that, A flange block is further provided between the bushing and the housing, and the flange block is connected to the housing through a bolt member.

7. The bidirectional mechanical seal structure of the gear pump according to claim 6, characterized in that, A limiting portion is further provided on the outer wall of the bushing near the flange block. The limiting portion is connected to the bushing through a bolt member and can radially limit the flange block.

8. The bidirectional mechanical seal structure of the gear pump according to claim 6, characterized in that, A sealing ring is further provided between the outer wall of the side of the bushing away from the flange block and the housing.

Images