Double-end-face mechanical seal internal circulation device
By using an eccentric pump-effect ring and multiple drainage tanks in the double-end mechanical seal, the circulating flow is formed by centrifugal force, which solves the problem of insufficient circulating flow of the sealing liquid in the prior art and improves the heat exchange effect of the seal.
Patent Information
- Application Number
- CN202323560621.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-26
AI Technical Summary
The existing dual-end mechanical seal internal circulation device has poor design, resulting in too low circulation flow or inability to circulate, affecting the heat exchange effect of mechanical seal.
An eccentric pump-effect ring is used, combined with the centrifugal force generated during rotation, multiple drainage grooves are designed to form a circulating flow to ensure effective circulation of the sealing liquid in the cavity.
The sealing liquid circulating flow with a simple structure and good circulation effect is achieved, and the use effect of mechanical sealing is improved.
Smart Images
Figure CN222208986U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a double-end-face mechanical seal internal circulation device. Background Art
[0002] Double-end mechanical seals are generally used together with auxiliary systems such as APIPLAN52, 53A, 53B, and 53C to provide lubrication and cooling for the seals. In these auxiliary systems, the internal circulation device is an important device to ensure the normal operation of the auxiliary system. It can provide the power required for the sealing liquid circulation and ensure that the sealing liquid circulates along the pipeline at a certain flow rate. The internal circulation device directly determines the circulation flow rate of the sealing liquid. If the circulation device is not designed well, the circulation flow rate of the sealing liquid will be too low or the sealing liquid will not be able to circulate, which will eventually lead to untimely heat exchange of the mechanical seal, directly affecting the use effect of the mechanical seal. Utility Model Content
[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a double-end mechanical seal internal circulation device of a centrifugal and eccentric combination.
[0004] In order to achieve the purpose of the utility model, the present application provides the following technical solutions.
[0005] In the first aspect, the present application provides a double-end mechanical seal internal circulation device, the mechanical seal includes a cavity and a sealing assembly arranged inside the cavity, the sealing assembly includes a static assembly and a dynamic assembly, the dynamic assembly is fixed to the rotating shaft, the static assembly is fixed to the cavity, a liquid inlet channel is opened at the bottom of the cavity, and a liquid outlet channel is opened at the top, characterized in that the internal circulation device includes a pump effect ring, the pump effect ring is coaxially fixed on the dynamic assembly, the rotating shaft is coaxially arranged with the outer wall of the cavity, the inner wall and the outer wall of the cavity are eccentrically arranged, that is, the pump effect ring is eccentrically installed inside the cavity.
[0006] In an implementation of the first aspect, the axis of the rotating shaft is parallel to the axis of the inner wall of the cavity and the distance between the two is 0.5 to 2 mm.
[0007] In one implementation of the first aspect, a plurality of drainage grooves are evenly arranged on the outer wall of the pump effect ring.
[0008] In one implementation of the first aspect, the depth of the drainage groove is 2 to 5 mm.
[0009] In one implementation of the first aspect, the number of the drainage grooves is 8 to 20.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] Through the eccentric installation and the centrifugal force generated when the pump effect ring rotates, the circulating sealing liquid forms a circulating flow inside the cavity, the structure is simple and the circulation effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the cross-sectional structure of the mechanical seal of this application;
[0013] Figure 2 Schematic diagram of the three-dimensional structure of the pump effect ring;
[0014] Figure 3 This is a schematic diagram of the installation eccentricity of the inner circulation device when the shaft rotates clockwise;
[0015] Figure 4 This is a schematic diagram of the installation eccentricity of the internal circulation device when the shaft rotates counterclockwise.
[0016] In the attached drawings, 1 is the rotating shaft, 2 is the cavity, 3 is the moving assembly, 4 is the pump effect ring, 5 is the liquid inlet channel, 6 is the liquid outlet channel, 7 is the drainage groove, S is the eccentricity value, M is the left clearance, and N is the right clearance. DETAILED DESCRIPTION
[0017] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons with ordinary skills in the technical field to which the utility model belongs. All the values from the lowest value to the highest value listed in this article refer to all the values obtained by incrementing one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units.
[0018] The following will describe the specific implementation of the utility model. It should be noted that in the specific description of these implementations, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual implementation. Without departing from the spirit and scope of the utility model, those skilled in the art may modify and replace the implementation of the utility model, and the resulting implementation is also within the scope of protection of the utility model.
[0019] Example
[0020] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.
[0021] Example 1
[0022] A mechanical seal having a structure such as Figure 1As shown, it includes a cavity 2 and a dynamic component 3 and a static component (not shown in the figure) arranged in the cavity 2. The dynamic component 3 is fixed on the rotating shaft 1 and rotates with the rotating shaft 1. The static component is fixed on the cavity 2 and remains stationary. The dynamic component 3 and the static component abut each other to form a sealing surface. A liquid inlet channel 5 is provided at the bottom of the cavity 2, and a liquid outlet channel 6 is provided at the top of the cavity 2. The sealing liquid enters the cavity 2 from the liquid inlet channel 5 and is finally discharged from the liquid outlet channel 6, thereby forming a liquid seal and cooling effect inside the cavity 2. This is a common structure of mechanical seals and will not be repeated in this application.
[0023] In the present application, a pump effect ring 4 is fixed to the outside of the moving assembly 3, wherein the rotating shaft 1, the moving assembly 3 and the pump effect ring 4 are coaxially arranged, and the structure of the pump effect ring 4 is as follows: Figure 2 As shown, a number of drainage grooves 7 of a certain shape and a certain depth are opened on the outer side wall of the pump effect ring 4 (12 drainage grooves 7 are used as an example in the figure), which is used to introduce the sealing liquid into the drainage grooves 7 of the pump effect ring 4, so that the sealing liquid rotates with the pump effect ring 4. In the present application, the inner wall and the outer wall of the cavity are not coaxially arranged, but eccentrically arranged, resulting in the eccentric installation between the pump effect ring 4 (including the moving component 3 and the rotating shaft 1) and the inner wall of the cavity 2. According to the different rotation directions of the equipment shaft, the eccentric position is different, as shown in the following figure. Figure 3 , Figure 4 shown.
[0024] When the shaft 1 rotates clockwise, Figure 3 As shown, the axis of cavity 2 is eccentric to the left, and the eccentricity between the axis of cavity 2 and the axis of rotating shaft 1 is S. After eccentric installation, the distances between the inner wall of cavity 2 and the outer wall of pump effect ring 4 are M and N respectively, M is the left gap, N is the right gap, and M>N. After the sealing liquid enters from the liquid inlet channel 5, it enters the drainage groove 7 of the pump effect ring 4 and rotates clockwise therewith. Under the action of centrifugal force, the sealing liquid is thrown to the inner diameter of cavity 2. Due to the existence of eccentricity, the sealing liquid is compressed during rotation, the potential energy of the liquid increases, and a high-pressure area is formed near the liquid outlet channel 6. The liquid flows out with the outlet under the action of high pressure, and forms a circulating flow under the action of the pressure difference.
[0025] When the shaft 1 rotates counterclockwise, Figure 4 As shown, the axis of cavity 2 is eccentric to the right, and the eccentricity between the axis of cavity 2 and the axis of rotating shaft 1 is S. After eccentric installation, the distances between the inner wall of cavity 2 and the outer wall of pump effect ring 4 are M and N respectively, M is the left gap, N is the right gap, and M<N. After the sealing liquid enters from the liquid inlet channel 5, it enters the drainage groove 7 of the pump effect ring 4 and rotates counterclockwise therewith. Similarly, under the action of centrifugal force, the sealing liquid is thrown to the inner wall of cavity 2. Due to the existence of eccentricity, the sealing liquid is compressed during rotation, the potential energy of the liquid increases, and a high-pressure area is formed near the liquid outlet channel 6. The liquid flows out with the outlet under the action of high pressure, and forms a circulating flow under the action of the pressure difference.
[0026] For different working conditions, drainage grooves 7 of different shapes can be designed, or the circulating sealing liquid flow rate can be increased by changing the number and depth of drainage grooves 7. The eccentricity value S is the key to the pressure difference flow of the sealing liquid. Within the allowable range of the gaps M and N, the larger the eccentricity value S, the greater the pressure difference generated.
[0027] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.
Claims
1. A double-end mechanical seal internal circulation device, the mechanical seal comprises a cavity and a sealing assembly arranged inside the cavity, the sealing assembly comprises a static assembly and a dynamic assembly, the dynamic assembly is coaxially fixed to the rotating shaft, the static assembly is fixed to the cavity, a liquid inlet channel is provided at the bottom of the cavity, and a liquid outlet channel is provided at the top, characterized in that: The internal circulation device comprises a pump effect ring, which is coaxially fixed on the moving assembly. The rotating shaft is coaxially arranged with the outer wall of the cavity, and the inner wall and the outer wall of the cavity are eccentrically arranged.
2. The double-end mechanical seal internal circulation device according to claim 1, characterized in that: The axis of the rotating shaft is parallel to the axis of the inner wall of the cavity and the distance between the two is 0.5 to 2 mm.
3. The double-end mechanical seal internal circulation device according to claim 1, characterized in that: A plurality of drainage grooves are evenly arranged on the outer wall of the pump effect ring.
4. The double-end mechanical seal internal circulation device according to claim 3, characterized in that: The depth of the drainage groove is 2 to 5 mm.
5. The double-end mechanical seal internal circulation device according to claim 3 or 4, characterized in that: The number of the drainage grooves is 8 to 20.