Vacuum pump shaft sealing device

Abstract

The utility model provides a vacuum pump shaft sealing device. The vacuum pump shaft sealing device comprises a vacuum pump body; the sealing structure is arranged on the pump shaft in the vacuum pump body in a sleeving manner, and a sealing cavity is formed between the sealing structure and a shell of the vacuum pump body; the sealing structure comprises a first packing ring, a water sealing ring, a second packing ring and a pressing plate. The first packing ring, the water seal ring and the second packing ring are sequentially arranged on the pump shaft of the vacuum pump body in the sealing cavity in a sleeving mode, a water seal through hole is formed in the water seal ring in the circumferential direction, and the pressing plate is arranged on the pump shaft of the vacuum pump body outside the sealing cavity in a sleeving mode and connected with a shell of the vacuum pump body. The second packing ring and the pressing plate are close to each other, and the two close side walls abut against each other. And the desalted water pipe is located outside the vacuum pump body and communicates with the sealing cavity. The mode of sealing the pump shaft of the vacuum pump body has the advantages of being environmentally friendly and sustainable, the sealing cost is reduced, and the service life of the vacuum pump body is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of sealing, and particularly to a shaft sealing device for a vacuum pump. Background Art

[0002] With the increasingly strict national environmental protection requirements, zero discharge of sewage needs to be achieved. Enterprises everywhere have carried out fractional crystallization of concentrated brine and separated and reused each component in the concentrated brine. The key technology for fractional crystallization of concentrated brine is flash evaporation separation through vacuum, and vacuum is generally achieved through a vacuum pump.

[0003] Currently, a mechanical seal structure is generally used for shaft sealing of a vacuum pump. Specifically, a sealing ring made of silicon carbide is sleeved on the pump shaft of the vacuum pump to achieve sealing of the pump shaft of the vacuum pump. Since there are many salts and other impurities in the concentrated brine evaporation and crystallization system, the non-condensable gas sucked by the vacuum pump is very easy to scale. On the one hand, after long-term operation, the scaling degree inside the vacuum pump is relatively serious, reducing the internal space of the vacuum pump and thus affecting the suction volume of the vacuum pump. On the other hand, scaling may occur between the sealing ring and the pump shaft of the vacuum pump during the above mechanical sealing process, causing the pump shaft of the vacuum pump to become stuck, resulting in poor sealing effect, thereby causing a decrease in vacuum degree and seriously affecting the normal operation of the concentrated brine evaporation and crystallization system. Summary of the Utility Model

[0004] The present application provides a shaft sealing device for a vacuum pump to solve the technical problems described in the above background art.

[0005] To solve the above technical problems, the present application is implemented by adopting the following technical solutions:

[0006] The present application provides a shaft sealing device for a vacuum pump, including:

[0007] A vacuum pump body;

[0008] A sealing structure, the sealing structure is sleeved on the pump shaft inside the vacuum pump body and forms a sealing cavity with the housing of the vacuum pump body; the sealing structure includes a first packing ring, a water seal ring, a second packing ring and a pressing plate; the first packing ring, the water seal ring and the second packing ring are sequentially sleeved on the pump shaft of the vacuum pump body inside the sealing cavity, a water seal through hole is provided in the circumferential direction of the water seal ring, the pressing plate is sleeved on the pump shaft of the vacuum pump body outside the sealing cavity and is connected to the housing of the vacuum pump body, and the second packing ring and the pressing plate are close to each other and the two side walls close to each other are in contact;

[0009] A desalination water pipe, the desalination water pipe is located outside the vacuum pump body and is communicated with the sealing cavity.

[0010] Optionally, a water collecting groove with a preset depth is formed on the outer peripheral wall of the water seal ring along its circumferential direction;

[0011] The preset depth of the water collecting groove is 0.8 - 0.9 times the difference between the outer diameter and the inner diameter of the water seal ring.

[0012] Optionally, there are multiple water seal through holes, and the multiple water seal through holes are distributed at equal intervals along the circumferential direction of the water collecting groove;

[0013] The aperture of each water seal through hole is 12 mm - 18 mm.

[0014] Optionally, both the first packing ring and the second packing ring have a first preset thickness;

[0015] The water seal ring has a second preset thickness, and the second preset thickness is 2 - 3 times the first preset thickness.

[0016] Optionally, there are multiple first packing rings and multiple second packing rings;

[0017] The multiple first packing rings and the multiple second packing rings are both made of polytetrafluoroethylene.

[0018] Optionally, the water seal ring is made of stainless steel.

[0019] Optionally, one end of the desalinated water pipe away from the vacuum pump body is used to connect to a desalinated water generating device, and a metering pump is arranged thereon.

[0020] Optionally, the pressing plate and the shell of the vacuum pump body are detachably connected through fasteners;

[0021] The fasteners include fastening bolts and nuts;

[0022] A first threaded through hole is formed on the pressing plate, a second threaded through hole corresponding to the first threaded through hole is formed on the shell of the vacuum pump body, the screw end of the fastening bolt sequentially passes through the second threaded through hole and the first threaded through hole and extends outside the sealing cavity, and the nut is sleeved on the screw of the fastening bolt located outside the sealing cavity.

[0023] The vacuum pump shaft seal device provided by the present application forms a sealing cavity between the sealing structure and the housing of the vacuum pump body by sleeving the sealing structure on the pump shaft within the vacuum pump body. Then, the pressing plate in the sealing structure is connected to the housing of the vacuum pump body, enabling the pressing plate to abut against the second packing ring close to it, thereby fixing the first packing ring, water seal ring, and second packing ring included in the sealing structure within the sealing cavity. This makes the sealing between the pump housing of the vacuum pump body and the pump shaft of the vacuum pump body more stable by the first packing ring, water seal ring, and second packing ring within the sealing cavity, thus improving the sealing effect of the pump shaft of the vacuum pump body. Additionally, desalted water is introduced into the sealing cavity through the desalted water pipe, filling the entire sealing cavity with desalted water. The desalted water within the sealing cavity flows into and diffuses along the pump shaft of the vacuum pump body through the water seal through-holes formed in the circumferential direction of the water seal ring, thereby achieving the sealing of the pump shaft of the vacuum pump body by the desalted water. The method of using desalted water to seal the pump shaft of the vacuum pump body in the present application has the advantages of environmental protection and sustainability, reducing the sealing cost. At the same time, while the desalted water seals the pump shaft of the vacuum pump body, it can also serve the purpose of cooling the vacuum pump body, thereby extending the service life of the vacuum pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 FIG. is a schematic structural diagram of a vacuum pump shaft seal device provided by an embodiment of the present application;

[0026] Figure 2 FIG. is a schematic structural diagram of a sealing structure provided by an embodiment of the present application;

[0027] Figure 3 FIG. is a schematic structural diagram of a water seal ring provided by an embodiment of the present application

[0028] In the figure: 100, vacuum pump body; 200, sealing structure; 201, first packing ring; 202, water seal ring; 2021, water seal through-hole; 2022, water collecting groove; 203, second packing ring; 204, pressing plate; 300, sealing cavity; 400, desalted water pipe; 401, metering pump; 500, desalted water generating device; 600, fastener; 601, fastening bolt; 602, nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following clearly and completely describes the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts also belong to the scope of protection of this application.

[0030] Referring Figures 1 to 3 , this application provides a pump shaft sealing device for a vacuum pump, including:

[0031] A vacuum pump body 100; among them, a vacuum pump refers to a device or equipment that evacuates a container to be evacuated by mechanical, physical, chemical, or physical-chemical methods to obtain a vacuum. Generally speaking, a vacuum pump is a device that improves, generates, and maintains a vacuum in a closed space by various methods. Specifically, according to the working principle of the vacuum pump, the vacuum pump can basically be divided into two types, namely, a gas capture pump and a gas transfer pump. It is widely used in industries such as metallurgy, chemical industry, food, and electronic coating. The model of the vacuum pump body 100 and the specifications corresponding to each model of the vacuum pump body 100 can be set according to actual needs. Therefore, this application does not specifically limit it here.

[0032] A sealing structure 200, the sealing structure 200 is sleeved on the pump shaft inside the vacuum pump body 100 and forms a sealing cavity 300 with the housing of the vacuum pump body 100; the sealing structure 200 includes a first packing ring 201, a water seal ring 202, a second packing ring 203, and a pressing plate 204; the first packing ring 201, the water seal ring 202, and the second packing ring 203 are sequentially sleeved on the pump shaft of the vacuum pump body 100 inside the sealing cavity 300. A water seal through hole 2021 is provided in the circumferential direction of the water seal ring 202. The pressing plate 204 is sleeved on the pump shaft of the vacuum pump body 100 outside the sealing cavity 300 and is connected to the housing of the vacuum pump body 100. The second packing ring 203 and the pressing plate 204 are close to each other and the two side walls close to each other are in contact; among them, the setting of the pressing plate 204 can sequentially apply a certain squeezing force to the second packing ring 203, the water seal ring 202, and the first packing ring 201, so that the connection between the first packing ring 201, the water seal ring 202, and the second packing ring 203 is tighter, thereby improving the sealing performance of the first packing ring 201, the water seal ring 202, and the second packing ring 203 on the pump shaft of the vacuum pump body 100, and the inner diameters of the first packing ring 201, the water seal ring 202, and the second packing ring 203 are all matched with the diameter of the pump shaft of the vacuum pump body 100.

[0033] The desalinated water pipe 400 is located outside the vacuum pump body 100 and communicates with the sealing cavity 300. The purpose of the desalinated water pipe 400 is to introduce desalinated water into the sealing cavity 300, and the desalinated water is used to seal the pump shaft of the vacuum pump body 100. This sealing method has the advantages of environmental protection and continuity.

[0034] For the vacuum pump shaft sealing device provided in this application, the sealing structure 200 is sleeved on the pump shaft inside the vacuum pump body 100, so that a sealing cavity 300 is formed between the sealing structure 200 and the housing of the vacuum pump body 100. Then, the pressing plate 204 in the sealing structure 200 is connected to the housing of the vacuum pump body 100, so that the pressing plate 204 abuts against the second packing ring 203 close to it, realizing the fixation of the first packing ring 201, the water sealing ring 202 and the second packing ring 203 included in the sealing structure 200 in the sealing cavity 300. This makes the sealing of the pump housing of the vacuum pump body 100 and the pump shaft of the vacuum pump body 100 more stable by the first packing ring 201, the water sealing ring 202 and the second packing ring 203 in the sealing cavity 300, thereby improving the sealing effect of the pump shaft of the vacuum pump body 100. In addition, desalinated water is introduced into the sealing cavity 300 through the desalinated water pipe 400, so that the desalinated water fills the entire sealing cavity 300. The desalinated water in the sealing cavity 300 flows into and diffuses along the pump shaft of the vacuum pump body 100 through the water sealing through holes 2021 provided in the circumferential direction of the water sealing ring 202, thereby realizing the sealing of the pump shaft of the vacuum pump body 100 by the desalinated water. The method of using desalinated water to seal the pump shaft of the vacuum pump body 100 in this application has the advantages of environmental protection and sustainability, reduces the sealing cost, and at the same time, while the desalinated water seals the pump shaft of the vacuum pump body 100, it can also play the role of cooling the vacuum pump body 100, thereby prolonging the service life of the vacuum pump body 100.

[0035] In some embodiments, referring to Figure 3 , a water collecting groove 2022 with a preset depth is provided on the outer peripheral wall of the water sealing ring 202 in its circumferential direction, and the water sealing through hole 2021 is provided in the water collecting groove 2022; the purpose of the water collecting groove 2022 is to collect the desalinated water entering the sealing cavity 300 through the desalinated water pipe 400 into the water collecting groove 2022, so that the water collecting groove 2022 has a certain water storage space and can collect a certain amount of water.

[0036] Specifically, the preset depth of the water accumulation groove 2022 is 0.8 to 0.9 times the difference between the outer diameter and the inner diameter of the water seal ring 202. The preset depth is a prerequisite for ensuring that the water accumulation groove 2022 has sufficient water storage space. For example, when the difference between the outer diameter and the inner diameter of the water seal ring 202 is 40 mm, the preset depth is 32 mm to 36 mm. That is to say, the value range of the preset depth depends on the difference between the outer diameter and the inner diameter of the water seal ring 202. Therefore, this application does not specifically limit the value of the preset depth here.

[0037] In some embodiments, referring to Figure 3 , there are multiple water seal through holes 2021 in this application. The multiple water seal through holes 2021 are evenly distributed along the circumferential direction of the water accumulation groove 2022. This can ensure that the desalted water entering and filling the sealing cavity 300 through the desalination water pipe 400 can be evenly distributed along the circumferential direction of the water accumulation groove 2022 through the multiple water seal through holes 2021 on the circumferential side of the pump shaft of the vacuum pump body 100 and flow along the length direction of the pump shaft of the vacuum pump body 100, ensuring the uniformity of the desalted water seal for the pump shaft of the vacuum pump body 100 and improving the sealing effect of the desalted water on the pump shaft of the vacuum pump body 100. In addition, the specific number of the water seal through holes 2021 and the interval between every two adjacent water seal through holes 2021 can be set according to the outer diameter and inner diameter of the water seal ring 202, etc. Therefore, this application does not further limit it here.

[0038] In addition, the aperture of each water seal through hole 2021 is 12 mm to 18 mm. This can ensure that the desalted water flowing through the water seal through hole 2021 to the pump shaft of the vacuum pump body 100 has sufficient flow velocity and flow rate to achieve an effective seal of the desalted water on the pump shaft of the vacuum pump body 100. The specific value of the aperture of the water seal through hole 2021 can be set according to the actual situation. Therefore, this application does not specifically limit it here.

[0039] In some embodiments, the first packing ring 201 and the second packing ring 203 in this application are both of a first preset thickness (i.e., the length in the axial direction of the pump shaft of the vacuum pump body 100); among them, the first preset thickness can be set according to actual needs (for example: it can be set according to the length of the sealing cavity 300 along the pump shaft of the vacuum pump body 100). Therefore, this application does not specifically limit it here.

[0040] Specifically, the water seal ring 202 is of a second preset thickness, and the second preset thickness is 2 to 3 times the first preset thickness. Among them, the value of the second preset thickness depends on the value of the first preset thickness. For example, if the first preset thickness is 15 mm, then the second preset thickness is between 30 mm and 45 mm, and it can be specifically set according to actual needs. This application does not specifically limit it here.

[0041] In some embodiments, there are multiple first packing rings 201 and multiple second packing rings 203 in the present application; among them, the multiple first packing rings 201 and the multiple second packing rings 203 are provided to ensure that the pump shaft of the vacuum pump body 100 in the sealing cavity 300 can be fully sealed through the multiple first packing rings 201, the water seal ring 202, and the multiple second packing rings 203, that is, the specific number of the first packing rings 201 and the specific number of the second packing rings 203 can be set according to the actual situation such as the size of the sealing cavity 300 as required. Therefore, the present application does not make specific limitations on this here.

[0042] In addition, the multiple first packing rings 201 and the multiple second packing rings 203 are both made of polytetrafluoroethylene. Among them, using polytetrafluoroethylene as the material of the first packing ring 201 and the second packing ring 203 has many advantages such as self-lubricity, low friction coefficient, high temperature resistance, corrosion resistance, wear resistance, extended service life, high thermal conductivity, and good mechanical properties. That is to say, polytetrafluoroethylene as a packing ring shows significant advantages in improving the sealing performance, reducing friction, enhancing the temperature and corrosion resistance, and extending the service life, thereby improving the sealing performance of the pump shaft of the vacuum pump body 100.

[0043] In some embodiments, the water seal ring 202 in the present application is made of stainless steel. Among them, the water seal ring 202 made of stainless steel has corrosion resistance and high pressure-bearing capacity, and due to the good corrosion resistance and wear resistance of stainless steel, the operation and maintenance costs of the water seal ring 202 are greatly reduced, thereby reducing the maintenance cost of the water seal ring 202. In addition, stainless steel can work in a wide temperature range and maintain stable performance from low temperature to high temperature. For example, some stainless steel products can withstand continuous working temperatures from -20°C to +80°C, thereby improving the adaptability of the water seal ring 202.

[0044] In some embodiments, referring to Figure 1 , one end of the desalinated water pipe 400 away from the vacuum pump body 100 is used to connect to the desalinated water generating device 500, and a metering pump 401 is provided thereon. Among them, the specifications and models of the metering pump 401 can be set according to actual needs, and the present application does not make specific limitations on this here.

[0045] In the above embodiments, the metering pump 401 is opened to pump the desalinated water generated by the desalinated water generating device 500 into the sealing cavity 300, and the pump shaft of the vacuum pump body 100 is sealed by the desalinated water. The metering pump 401 can not only provide the flow power of the desalinated water, but also meter the desalinated water flowing into the sealing cavity 300, so as to accurately master the amount of desalinated water introduced into the sealing cavity 300 and realize the quantitative replenishment of the desalinated water.

[0046] In some embodiments, referring toFigure 1 In the present application, the pressing plate 204 and the housing of the vacuum pump body 100 are detachably connected by fasteners 600, which facilitates the installation and disassembly of the pressing plate 204, thereby improving the convenience of installing the pressing plate 204 onto the housing of the vacuum pump body 100 or disassembling it from the housing of the vacuum pump body 100.

[0047] In addition, the fasteners 600 include fastening bolts 601 and nuts 602; specifically, the pressing plate 204 is provided with first threaded through holes, and the housing of the vacuum pump body 100 is provided with second threaded through holes corresponding to the first threaded through holes. The screw end of the fastening bolt 601 sequentially passes through the second threaded through hole and the first threaded through hole and extends outside the sealing cavity 300, and the nut 602 is sleeved on the screw of the fastening bolt 601 located outside the sealing cavity 300. Among them, there can be multiple first threaded through holes and multiple second threaded through holes, and the multiple first threaded through holes and the multiple second threaded through holes correspond one by one, and each first threaded through hole and each second threaded through hole correspond to a fastening bolt. The number of the first threaded through holes and the number of the second threaded through holes can both be set according to actual situations, and the present application does not make specific limitations on them here.

[0048] In the above embodiment, the screw end of the fastening bolt 601 sequentially passes through the second threaded through hole and the first threaded through hole and extends outside the sealing cavity 300, and the nut 602 is sleeved on the screw of the fastening bolt 601 located outside the sealing cavity 300, thereby fixing the pressing plate 204 and the pump shaft of the vacuum pump body 100 together. By unscrewing the nut 602 and then screwing the screw end of the fastening bolt 601 into the vacuum cavity 300, the fastening bolt 601 can be disassembled, thereby realizing the disassembly of the pressing plate 204 from the housing of the vacuum pump body 100. The convenience of installing the pressing plate 204 onto the housing of the vacuum pump body 100 or disassembling it from the housing of the vacuum pump body 100 is relatively high and easy to operate.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vacuum pump shaft sealing device, characterized in that: include: Vacuum pump body (100); A sealing structure (200), wherein the sealing structure (200) is sleeved on the pump shaft inside the vacuum pump body (100) and forms a sealing cavity (300) with the shell of the vacuum pump body (100); the sealing structure (200) comprises a first packing ring (201), a water seal ring (202), a second packing ring (203) and a pressure plate (204); the first packing ring (201), the water seal ring (202) and the second packing ring (203) are sleeved on the pump shaft of the vacuum pump body (100) inside the sealing cavity (300) in sequence, a water seal through hole (2021) is opened in the circumferential direction of the water seal ring (202), the pressure plate (204) is sleeved on the pump shaft of the vacuum pump body (100) outside the sealing cavity (300) and is connected to the shell of the vacuum pump body (100), the second packing ring and the pressure plate (204) are close to each other and the two side walls close to each other abut against each other; A desalted water pipe (400), wherein the desalted water pipe (400) is located outside the vacuum pump body (100) and is in communication with the sealed chamber (300).

2. The vacuum pump shaft sealing device according to claim 1, characterized in that: The water seal ring (202) is provided with a water collecting groove (2022) of a preset depth on its circumferential outer wall; The preset depth of the water collecting groove (2022) is 0.8 to 0.9 times the difference between the outer diameter and the inner diameter of the water sealing ring (202).

3. The vacuum pump shaft sealing device according to claim 2, characterized in that: There are a plurality of water seal through holes (2021), and the plurality of water seal through holes (2021) are evenly spaced and distributed along the circumference of the water collecting groove (2022); The aperture of each water seal through hole (2021) is 12 mm to 18 mm.

4. The vacuum pump shaft sealing device according to claim 1, characterized in that: The first filler ring (201) and the second filler ring (203) both have a first preset thickness; The water seal ring (202) has a second preset thickness, which is 2 to 3 times the first preset thickness.

5. The vacuum pump shaft sealing device according to claim 1, characterized in that: There are a plurality of the first packing ring (201) and a plurality of the second packing ring (203); The plurality of first filler rings (201) and the plurality of second filler rings (203) are all made of polytetrafluoroethylene.

6. The vacuum pump shaft sealing device according to claim 1, characterized in that: The water seal ring (202) is made of stainless steel.

7. The vacuum pump shaft sealing device according to claim 1, characterized in that: One end of the desalted water pipe (400) away from the vacuum pump body (100) is used to connect to a desalted water generating device (500), and a metering pump (401) is arranged on the desalted water pipe.

8. The vacuum pump shaft sealing device according to any one of claims 1 to 7, characterized in that: The pressing plate (204) is detachably connected to the housing of the vacuum pump body (100) via a fastener (600); The fastener (600) comprises a fastening bolt (601) and a nut (602); A first threaded through hole is provided on the pressure plate (204), and a second threaded through hole corresponding to the first threaded through hole is provided on the shell of the vacuum pump body (100). The screw end of the fastening bolt (601) passes through the second threaded through hole and the first threaded through hole in sequence and extends out of the sealing cavity (300). The nut (602) is sleeved on the screw of the fastening bolt (601) located outside the sealing cavity (300).

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