Mechanical seal suppression device for desulfurization pump
By using high-precision grinding of static rings and dynamic rings in the desulfurization pump, combined with flexible materials and adjustment structures, the problem of mechanical seal cooling water leakage is solved, and resource conservation and seal reliability are improved.
Patent Information
- Application Number
- CN202323541421.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-25
AI Technical Summary
There is a problem of cooling water leakage in mechanical seals in desulfurization pumps, resulting in waste of resources and environmental pollution, which is difficult to effectively solve in the existing technology.
A mechanical seal structure including a shaft sleeve, cavity, main seal and suppression device is designed. The static ring and the moving ring are abutted by a high-precision grinding, combined with the adjustment pad, O-ring and limiting snap ring, the moving ring is Rubber material, the static ring is made of silicon carbide material, and the cooling water leakage is reduced through the combination of precision sealing and flexible materials.
It significantly reduces the consumption of cooling water and on-site emissions, improves the reliability of seals, and plays a backup seal when the main seal fails, extending the service life of the equipment.
Smart Images
Figure CN222185188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sealing, in particular to a mechanical sealing suppression device for a desulfurization pump. Background Art
[0002] Desulfurization pumps are widely used in flue gas desulfurization devices in power plants. The working medium of desulfurization pumps is generally limestone slurry, which contains particulate impurities and is easy to crystallize. Mechanical seals for desulfurization pumps mostly use single-end mechanical seals, which are generally used in conjunction with the PLAN62 auxiliary system, that is, cooling water is introduced from the outside to the back of the seal to reduce the heat of the seal and wash away the medium leaking from the seal surface. The cooling water and the atmosphere are generally reduced by the suppression device of the throttling bushing, but due to the small gap between the throttling bushing and the sleeve, the cooling water is easy to leak into the atmosphere through these gaps, causing a large amount of leakage and waste of cooling water, and at the same time polluting the environment on site. Utility Model Content
[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a mechanical seal suppression device for a desulfurization pump with high sealing reliability.
[0004] In order to achieve the purpose of the utility model, the present application provides the following technical solutions.
[0005] In a first aspect, the present application provides a mechanical seal suppression device for a desulfurization pump, wherein the mechanical seal comprises a sleeve, a cavity and a main seal, wherein the sleeve is sleeved on the main shaft, the cavity is arranged on the outside of the sleeve, the main seal is arranged between the sleeve and the cavity and on a side close to the medium, the suppression device is arranged in the cavity and on a side away from the medium, the suppression device comprises a dynamic ring and a static ring, the dynamic ring is sleeved and fixed on the sleeve, the static ring is fixed on the cavity, and the dynamic ring abuts against the static ring.
[0006] In an implementation manner of the first aspect, a side of the stationary ring that abuts against the dynamic ring is subjected to high-precision grinding.
[0007] In one embodiment of the first aspect, a protrusion perpendicular to the axis of the main shaft is provided on the inner side of the cavity, the outer edge of the side where the static ring abuts against the dynamic ring abuts against the protrusion, and the other side of the static ring abuts against the tail end of the cavity.
[0008] In an implementation of the first aspect, an adjustment pad is provided at the abutment portion between the stationary ring and the protrusion, and the adjustment pad is made of a flexible material such as PTFE.
[0009] In an implementation of the first aspect, a limiting clamp ring is provided between the static ring and the rear end of the cavity.
[0010] In an implementation of the first aspect, an O-ring is provided between the outer side of the stationary ring and the cavity.
[0011] In one implementation of the first aspect, the stationary ring is made of a hard material such as silicon carbide.
[0012] In an implementation manner of the first aspect, the moving ring is made of a soft material, and the moving ring interference sleeve is arranged on the outer side of the shaft sleeve.
[0013] In an implementation of the first aspect, the moving ring is made of rubber.
[0014] In an implementation manner of the first aspect, a liquid inlet and a liquid outlet are provided on the cavity, and both the liquid inlet and the liquid outlet lead to between the main seal and the suppression device through a channel.
[0015] Compared with the prior art, the beneficial effects of the utility model are: it can greatly reduce the consumption of cooling water, reduce the on-site discharge of cooling water, and at the same time can play the role of backup sealing, thereby improving the reliability of sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the mechanical seal structure for an existing desulfurization pump;
[0017] Figure 2 This is a schematic diagram of the mechanical seal structure for the desulfurization pump of this application.
[0018] In the attached drawings, 1 is the main seal, 2 is the cavity, 3 is the sleeve, 4 is the dynamic ring, 5 is the adjustment pad, 6 is the static ring, 7 is the O-ring, 8 is the limit clamp, 9 is the liquid inlet, 10 is the liquid outlet, 11 is the channel, 12 is the protrusion, and 13 is the throttling bushing. DETAILED DESCRIPTION
[0019] 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.
[0020] 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.
[0021] Traditional desulfurization pumps use mechanical seals such as Figure 1 As shown, it includes a cavity 2 and a sleeve 3, a main seal 1 is provided between the cavity 2 and the sleeve 3, cooling water is introduced into the cavity 2, and a suppression device of a throttling bushing 13 is generally used between the cooling water and the atmosphere to reduce the leakage of cooling water. However, since there must be a certain small gap between the throttling bushing 13 and the sleeve 3, the cooling water is easy to leak into the atmosphere through these gaps, causing a large amount of cooling water leakage and waste, and at the same time causing pollution to the environment on site. The purpose of this application is to provide a mechanical seal suppression device that can eliminate the above problems.
[0022] In a specific embodiment, the present application provides a mechanical seal suppression device for a desulfurization pump, the mechanical seal includes a sleeve, a cavity and a main seal, the sleeve is sleeved on the main shaft, the cavity is arranged outside the sleeve, the main seal is arranged between the sleeve and the cavity and on the side close to the medium, the suppression device is arranged in the cavity and on the side away from the medium, the suppression device includes a dynamic ring and a static ring, the dynamic ring is sleeved and fixed on the sleeve, the static ring is fixed on the cavity, and the dynamic ring abuts against the static ring. The present application realizes sealing by the abutment between the static ring and the dynamic ring. Since the contact surface between the dynamic ring and the static ring is a plane, it is easier to achieve no gap in processing and the sealing effect is better.
[0023] In a specific embodiment, the side of the stationary ring that abuts the dynamic ring is subjected to high-precision grinding. The high-precision grinding can ensure that one side of the stationary ring has good flatness and smoothness, which can not only achieve better sealing, but also reduce wear on the dynamic ring.
[0024] In a specific embodiment, a protrusion perpendicular to the axis of the main shaft is provided on the inner side of the cavity, the outer edge of the side where the static ring abuts against the dynamic ring abuts against the protrusion, and the other side of the static ring abuts against the tail end of the cavity.
[0025] In a specific embodiment, an adjustment pad is provided at the contact point between the stationary ring and the protrusion, and the adjustment pad is made of PTFE. The adjustment pad is provided between the stationary ring and the protrusion to prevent hard contact between the stationary ring and the mechanical seal cavity.
[0026] In a specific embodiment, a limit clamp ring is provided between the stationary ring and the rear end of the cavity. In the present application, the stationary ring is clamped on the cavity by the limit clamp ring and the protrusion (or adjustment pad), so the thickness precision requirement of the stationary ring is not very high. On the one hand, the thickness of the limit clamp ring can be adjusted, and on the other hand, the adjustment pad has a certain elasticity and can be in interference fit with the stationary ring.
[0027] In a specific implementation, an O-ring is provided between the outer side of the stationary ring and the cavity.
[0028] In a specific embodiment, the material of the stationary ring is silicon carbide.
[0029] In a specific embodiment, the moving ring is made of soft material, and the moving ring interference sleeve is arranged on the outside of the shaft sleeve. The interference installation ensures that the moving ring rotates with the mechanical seal shaft sleeve, and prevents cooling water from leaking between the two.
[0030] In a specific implementation, the moving ring is made of rubber.
[0031] In a specific embodiment, a liquid inlet and a liquid outlet are provided on the cavity, and both the liquid inlet and the liquid outlet are connected to the main seal through a channel.
[0032] Example
[0033] 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.
[0034] Example 1
[0035] A mechanical seal suppression device for a desulfurization pump, such as Figure 2 As shown, the mechanical seal includes a cavity 2, a sleeve 3 and a main seal 1. A liquid inlet 9 and a liquid outlet 10 are provided on the cavity, both of which are connected to the inside of the cavity through a channel 11 to cool the main seal 1, the cavity 2 and the sleeve 3. The above structure is the same as the prior art. During normal operation, the mechanical seal is the main seal 1 to seal the working medium of the desulfurization pump to prevent the medium from leaking to the atmosphere; the cooling water of PLAN62 enters the back of the mechanical seal through the liquid inlet 9 hole, cools the main seal 1 and flushes away the leaked medium of the main seal 1, and then recovers it through the liquid outlet 10. The mechanical seal of the present application includes a suppression device, the core components of which are a dynamic ring 4 and a static ring 6, as follows:
[0036] The dynamic ring 4 in the suppression device is mostly made of soft materials such as rubber, and is interference-mounted on the outside of the mechanical seal sleeve 3. The interference-mounted installation ensures that the dynamic ring 4 rotates with the mechanical seal sleeve 3, while preventing cooling water from leaking between the two. The static ring 6 in the suppression device is usually made of silicon carbide and installed on the mechanical seal cavity 2. An O-ring 7 is used between the cavity 2 and the static ring 6 to prevent cooling water leakage. The adjustment gasket 5 is usually made of soft PTFE material and is installed between the mechanical seal cavity 2 and the static ring 6 to prevent the static ring 6 from hard contact with the mechanical seal cavity 2. The limit clamp 8 is installed on the mechanical seal cavity 2 to press the static ring 6 against the adjustment gasket 5 to prevent the static ring 6 from being pushed out.
[0037] The surfaces of the dynamic ring 4 and the static ring 6 in the suppression device are in close contact, and the working surface of the static ring is ground with high precision to ensure the flatness and smoothness of the sealing surface, ensuring that the cooling water of PLAN62 will not leak into the atmosphere in large quantities, while reducing the wear on the dynamic ring 4. In addition, when the main seal 1 of the mechanical seal fails, a large amount of pumping medium enters the outside of the suppression device. At this time, the suppression device can temporarily serve as the main seal to ensure that the medium of the desulfurization pump will not leak into the atmosphere in large quantities, providing time for on-site maintenance and replacement of the seal.
[0038] Compared with the conventional throttling bushing suppression structure, the suppression device in this embodiment can greatly reduce the consumption of cooling water and reduce the on-site discharge of cooling water. At the same time, it can serve as a backup seal and improve the reliability of the seal.
[0039] 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 mechanical seal suppression device for a desulfurization pump, the mechanical seal comprising a sleeve, a cavity and a main seal, the sleeve being sleeved on the main shaft, the cavity being arranged outside the sleeve, the main seal being arranged between the sleeve and the cavity and close to the medium, characterized in that: The suppression device is arranged in the cavity and on a side away from the medium. The suppression device comprises a dynamic ring and a static ring. The dynamic ring is sleeved and fixed on the shaft sleeve, and the static ring is fixed on the cavity, and the dynamic ring abuts against the static ring.
2. The mechanical seal suppression device for a desulfurization pump according to claim 1, characterized in that: The side of the stationary ring that contacts the dynamic ring is processed by high-precision grinding.
3. The mechanical seal suppression device for a desulfurization pump according to claim 1, characterized in that: A protrusion perpendicular to the main shaft axis is provided on the inner side of the cavity, the outer edge of the side where the static ring abuts against the dynamic ring abuts against the protrusion, and the other side of the static ring abuts against the tail end of the cavity.
4. The mechanical seal suppression device for a desulfurization pump according to claim 3, characterized in that: An adjustment pad is provided at the abutment position between the static ring and the protrusion, and the adjustment pad is made of a flexible material.
5. The mechanical seal suppression device for a desulfurization pump according to claim 3, characterized in that: A limiting clamp ring is provided between the static ring and the rear end of the cavity.
6. The mechanical seal suppression device for a desulfurization pump according to claim 1, characterized in that: An O-ring is arranged between the outer side of the stationary ring and the cavity.
7. The mechanical seal suppression device for a desulfurization pump according to any one of claims 1 to 6, characterized in that: The material of the stationary ring is a hard material.
8. The mechanical seal suppression device for a desulfurization pump according to claim 1, characterized in that: The material of the moving ring is a soft material, and the moving ring interference sleeve is arranged on the outer side of the shaft sleeve.
9. The mechanical seal suppression device for a desulfurization pump according to claim 8, characterized in that: The material of the dynamic ring is rubber.
10. The mechanical seal suppression device for a desulfurization pump according to claim 1, characterized in that: The cavity is provided with a liquid inlet and a liquid outlet, and both the liquid inlet and the liquid outlet lead to between the main seal and the suppression device through a channel.