Mechanical seal for a process for conveying salt lake brine

Abstract

The utility model discloses a kind of mechanical seal for salt lake brine conveying process, including the machine seal gland fixed on pump cover and the shaft sleeve fixed on pump shaft, dynamic ring and static ring are set on the shaft sleeve, the dynamic ring is fixed on the shaft sleeve, static ring is fixed on machine seal gland, the sealing surface of static ring and the sealing surface of dynamic ring keep adhering to form sealing end face, connect circulating water jacket on machine seal gland, form an oil injection cavity between machine seal gland and circulating water jacket, the oil injection cavity is communicated with sealing end face. The utility model adopts oil lubrication, provide a kind of full oil lubrication, crystallization resistance, corrosion-resistant mechanical seal, completely get rid of the dependence on fresh water, and adapt to high salt brine working condition.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology, and in particular relates to a mechanical seal for salt lake brine transportation process. Background Technology

[0002] In the development of the Lop Nur potash fertilizer base in Xinjiang, mechanical sealing technology in the brine transportation process is one of the keys to ensuring efficient production. Due to the high corrosiveness and easy crystallization of Lop Nur brine, as well as the extreme scarcity of local freshwater resources, traditional mechanical sealing technology faces severe challenges. Lop Nur brine is rich in potassium (K). + Na + Cl - SO4 2- In areas like Lop Nur, where the total salinity exceeds 300 g / L, scale easily forms on equipment surfaces, accelerating wear. Furthermore, the corrosion rate of brine on carbon steel, stainless steel, and other metals can reach over 1.5 mm / year, reducing the lifespan of traditional seals to less than 6 months. The most severe issue is Lop Nur, where annual precipitation is less than 30 mm. Traditional water-cooled seals require a large amount of fresh water, conflicting with sustainable development goals.

[0003] Therefore, addressing the shortcomings of the existing technologies has become the focus of efforts for those skilled in the field. Utility Model Content

[0004] The purpose of this utility model is to provide a mechanical seal for the salt lake brine conveying process. By optimizing the sealing structure and lubrication method, it solves the problems of rapid corrosion, easy crystallization, and large water consumption in traditional technologies, improves the stability and economy of equipment operation, and completely solves the shortcomings of the above-mentioned existing technologies.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A mechanical seal for conveying brine from a salt lake includes a mechanical seal cover fixed to a pump cover and a bushing fixed to a pump shaft. A rotating ring and a stationary ring are respectively arranged on the bushing. The rotating ring is fixed to the bushing, and the stationary ring is fixed to the mechanical seal cover. The sealing surface of the stationary ring and the sealing surface of the rotating ring are kept in contact to form a sealing end face. A circulating water jacket is connected to the mechanical seal cover, and an oil injection chamber is formed between the mechanical seal cover and the circulating water jacket. The oil injection chamber communicates with the sealing end face.

[0007] Preferably, a spring seat, a spring, and a push ring are installed between the stationary ring and the inner wall of the circulating water jacket. The spring seat is fixed to the inner wall of the circulating water jacket, and the spring and push ring are installed inside the spring seat. The push ring contacts the end face of the stationary ring, and the stationary ring is pressed tightly against the end face of the rotating ring by the spring and the push ring to form an end face friction pair.

[0008] Preferably, the mechanical seal gland is fixed to the pump cover by an O-ring.

[0009] Preferably, the end of the circulating water jacket is connected to a bearing cover, a first skeleton oil seal is fitted on the pump shaft, and a retaining ring is provided on the inner wall of the bearing cover. The first skeleton oil seal is fixed inside the bearing cover by the retaining ring.

[0010] Preferably, the inner wall of the circulating water jacket is provided with a limiting groove, and a second skeleton oil seal is installed in the limiting groove.

[0011] Preferably, the circulating water jacket is also provided with a drain port.

[0012] Preferably, the sealing surfaces of both the rotating ring and the stationary ring are made of silicon carbide material.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by using oil lubrication, it provides a fully oil-lubricated, anti-crystallization, and corrosion-resistant mechanical seal, completely eliminating the dependence on fresh water and adapting to high-salt brine working conditions. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention;

[0015] Figure 2 This is a cross-sectional view of the circulating water jacket in this utility model;

[0016] Figure 3 This is a cross-sectional view of the bearing cap in this utility model;

[0017] The markings in the attached diagram are: 1-bearing cap, 2-oil inlet, 3-first skeleton oil seal, 4-snap ring, 5-circulating water jacket, 6-spring seat, 7-spring, 8-push ring, 9-mechanical seal cap, 10-stationary ring, 11-dynamic ring, 13-shaft sleeve, 14-O-ring seal, 15-oil inlet cavity, 16-second skeleton oil seal. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] like Figures 1 to 3As shown, a mechanical seal for a salt lake brine conveying process includes a mechanical seal cover 9 fixed on a pump cover and a bushing 13 fixed on a pump shaft. The bushing 13 is clamped on the pump shaft and rotates with the pump shaft. A rotating ring 11 and a stationary ring 10 are correspondingly arranged on the bushing 13. The rotating ring 11 is fixed to the bushing 13 by a pin and rotates with the bushing 13. The stationary ring 10 is kept relatively stationary with the mechanical seal cover 9 by an O-ring seal 14. The sealing surface of the stationary ring 11 and the sealing surface of the rotating ring 10 are in contact and slide relative to each other to form a sealing end face, thereby achieving the main sealing effect.

[0020] A circulating water jacket 5 is connected to the mechanical seal cover 9. Specifically, the mechanical seal cover 9 is fixed to the pump cover by an O-ring 14, and the circulating water jacket 5 is fixed to the mechanical seal cover 9 by screws. An oil injection chamber 15 is formed between the mechanical seal cover 9 and the circulating water jacket 5. An oil injection port 2 communicating with the oil injection chamber 15 is opened on the circulating water jacket 5. Oil is injected into the oil injection chamber 15 through the oil injection port 2. The oil injection chamber 15 is connected to the sealing end face, and the oil lubricates the sealing end face.

[0021] In this embodiment, a spring seat 6, a spring 7, and a push ring 8 are installed between the stationary ring 10 and the inner wall of the circulating water jacket 5. The spring seat 6 is fixed to the inner wall of the circulating water jacket 5. The spring 7 and the push ring 8 are installed inside the spring seat 6. The push ring 8 is in contact with the end face of the stationary ring 10. The stationary ring 10 is pressed tightly against the end face of the moving ring 11 by the spring 7 and the push ring 8, forming an end face friction pair.

[0022] The inner wall of the circulating water jacket 5 is provided with a limiting groove, and a second skeleton oil seal 16 is installed in the limiting groove. The second skeleton oil seal 16 is limited between the circulating water jacket 5 and the spring seat 6 to prevent oil leakage in the oil injection chamber 15.

[0023] The end of the circulating water jacket 5 is connected to the bearing cover 1 by screws, and the medium is prevented from leaking from the end face by an O-ring seal 14. A first skeleton oil seal 3 is fitted on the pump shaft, and a retaining ring 4 is provided on the inner wall of the bearing cover 1. The first skeleton oil seal 3 is fixed inside the bearing cover 1 by the retaining ring 4 to prevent dust and impurities in the atmosphere from entering the bearing housing, and to prevent the medium from entering the mechanical seal housing due to mechanical seal failure.

[0024] In this embodiment, the circulating water jacket 5 is also provided with a drain port. When the mechanical seal fails, the leaked medium can be discharged through the drain port to avoid entering the bearing housing and causing greater damage.

[0025] In this embodiment, the bearing cap 1 is mainly used to protect and fix the bearing; an O-ring 14 is used to compensate for and seal any leakage points.

[0026] The sealing surfaces of both the moving ring 11 and the stationary ring 10 are made of silicon carbide material, which significantly improves corrosion resistance and wear resistance.

[0027] Work process:

[0028] When the pump is running, the bushing 13 rotates synchronously with the pump shaft, driving the rotating ring 11 to rotate. The spring force of the spring 7 keeps the sealing surface of the stationary ring 10 in contact with the sealing surface of the rotating ring 11, creating relative sliding and forming a dynamic seal. Engine oil is injected into the oil filling chamber through the oil filling port to lubricate the sealing end faces. The first and second skeleton oil seals 3 and 16 and the O-ring seal 14 prevent engine oil leakage and dust impurities from entering the bearing housing. When the mechanical seal fails, the leaked medium is discharged through the drain port on the circulating water jacket 5, preventing it from entering the bearing housing.

[0029] This invention utilizes a silicon carbide sealing surface, which improves corrosion resistance by more than three times, effectively resisting the strong corrosion of brine. The all-oil lubrication design avoids direct contact between the brine and the sealing surface, preventing the formation of scale. Using oil lubrication instead of traditional water cooling completely eliminates dependence on freshwater resources, making it suitable for water-scarce salt lake areas. The elasticity compensation mechanism of spring 7 ensures the sealing surface remains in contact at all times. The drain port design provides passive safety protection through a "failure-discharge-early warning" system, improving the long-term operational reliability of the equipment. The dual protection of the first and second skeleton oil seals and O-rings effectively prevents dust and impurities from entering the bearing housing and prevents media leakage. The modular design facilitates disassembly and maintenance, reducing the difficulty of on-site repairs.

[0030] This invention effectively solves the problems of corrosion, crystallization, and water shortage in the transportation of brine in Lop Nur, becoming one of the core technologies for salt lake resource development. Its successful application not only improves the continuity and economy of potash fertilizer production, but also provides a Chinese solution for other high-salinity brine projects worldwide.

[0031] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, the inventive aspect lies in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0032] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0033] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of this invention and form different embodiments.

[0034] It should be noted that the above embodiments are illustrative of the present invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical seal for a salt lake brine conveying process, comprising a mechanical seal gland fixed to a pump cover and a bushing fixed to a pump shaft, wherein a dynamic ring and a stationary ring are correspondingly arranged on the bushing, characterized in that: The rotating ring is fixed on the bushing, and the stationary ring is fixed on the mechanical seal cover. The sealing surface of the stationary ring and the sealing surface of the rotating ring are in contact to form a sealing end face. A circulating water jacket is connected to the mechanical seal cover, and an oil injection chamber is formed between the mechanical seal cover and the circulating water jacket. The oil injection chamber is connected to the sealing end face.

2. The mechanical seal for salt lake brine conveying process according to claim 1, characterized in that: A spring seat, a spring, and a push ring are installed between the stationary ring and the inner wall of the circulating water jacket. The spring seat is fixed to the inner wall of the circulating water jacket, and the spring and push ring are installed inside the spring seat. The push ring contacts the end face of the stationary ring, and the stationary ring is pressed tightly against the end face of the rotating ring by the spring and the push ring to form an end face friction pair.

3. The mechanical seal for salt lake brine conveying process according to claim 1, characterized in that: The mechanical seal cover is fixed to the pump cover by an O-ring.

4. The mechanical seal for salt lake brine transportation process according to claim 1, characterized in that: The end of the circulating water jacket is connected to the bearing cover, a first skeleton oil seal is fitted on the pump shaft, and a retaining ring is provided on the inner wall of the bearing cover. The first skeleton oil seal is fixed inside the bearing cover by the retaining ring.

5. The mechanical seal for salt lake brine transportation process according to claim 1, characterized in that: The inner wall of the circulating water jacket is provided with a limiting groove, and a second skeleton oil seal is installed in the limiting groove.

6. The mechanical seal for salt lake brine transportation process according to claim 1, characterized in that: The circulating water jacket is also equipped with a drain port.

7. The mechanical seal for salt lake brine transportation process according to claim 1, characterized in that: The sealing surfaces of both the rotating ring and the stationary ring are made of silicon carbide material.

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