Composite sealing structure

Abstract

The utility model discloses a composite sealing structure which comprises a first sealing assembly and a second sealing assembly, the first sealing assembly is arranged on the peripheral side of a shaft body in a surrounding mode, filler sealing is arranged between the first sealing assembly and the shaft body, the second sealing assembly comprises a rotating sealing sleeve and a liquid sealing box, and the rotating sealing sleeve is arranged on the shaft body; the rotating sealing sleeve is matched on the outer side of the first sealing assembly and the outer side of the shaft body to form an air outlet channel with an air outlet, the liquid sealing box is arranged on the outer side of the first sealing assembly in a surrounding mode, the liquid sealing box is suitable for being filled with liquid, and part of the rotating sealing sleeve is suitable for extending into the liquid in the liquid sealing box so that the liquid in the liquid sealing box can enter the air outlet channel and seal the air outlet. The liquid sealing box is matched with the liquid on the outer side of the rotating sealing sleeve to form a balance cavity, the balance cavity is suitable for receiving the liquid overflowing out of the gas outlet channel, and the liquid sealing device has the advantages of being good in sealing effect and low in maintenance frequency, gas leakage is not prone to occurring, and the influence of gas leakage can be resisted to a certain degree.

Description

Technical Field

[0001] The present application relates to the field of sealing technology, and in particular to a composite sealing structure. Background Art

[0002] A shaft seal is a device or technology used to prevent leakage of fluid (liquid or gas) along a rotating shaft or between a reciprocating shaft and a fixed component. It is widely used in industrial equipment such as pumps, compressors, and mixing equipment. Its core function is to maintain system pressure, prevent leakage of media or entry of contaminants, and reduce friction loss. Common shaft seal types include packing seals, mechanical seals, and power seals.

[0003] However, the existing shaft sealing form has the following defects: since the packing seal has a simple structure, low price and easy maintenance, it is widely used. However, because the packing seal is prone to wear, the sealing effect decreases quickly and the maintenance frequency is high. Utility Model Content

[0004] One object of the present application is to provide a composite sealing structure with good sealing effect and low maintenance frequency.

[0005] To achieve the above objectives, the technical solution adopted in the present application is: a composite sealing structure, including a first sealing component and a second sealing component, the first sealing component being arranged around the circumference of the shaft body, a packing seal being formed between the first sealing component and the shaft body, the second sealing component including a rotating sleeve and a liquid seal box, the rotating sleeve being arranged on the shaft body, the rotating sleeve cooperating on the outer sides of the first sealing component and the shaft body to form an outlet channel having an air outlet, the liquid seal box being arranged around the outer side of the first sealing component, the liquid seal box being suitable for being filled with liquid, part of the rotating sleeve being suitable for extending into the liquid in the liquid seal box so that the liquid in the liquid seal box enters the outlet channel and closes the air outlet, the liquid seal box cooperating with the liquid on the outer side of the rotating sleeve to form a balance chamber, the balance chamber being suitable for receiving liquid overflowing from the outlet channel.

[0006] In some embodiments, an air intake device is provided on the liquid sealing box, the air intake device is connected to the balance chamber, and the air intake device is suitable for inflating and pressurizing the balance chamber to limit the rising range of the liquid level in the balance chamber.

[0007] In some embodiments, a liquid level sensor is provided on the liquid level rising path in the balancing chamber. When the liquid level sensor is triggered, the air intake device is adapted to inflate and pressurize the balancing chamber.

[0008] In some embodiments, the liquid sealing box is provided with a liquid leakage sensor at the liquid overflow position, and when the liquid leakage sensor is triggered, the air intake device is adapted to inflate and pressurize the balance chamber.

[0009] In some embodiments, the first sealing assembly includes a stuffing box and a stuffing cover, the stuffing box and the stuffing cover are matched and connected along the circumference of the shaft, the liquid seal box is arranged around the outside of the stuffing box, the stuffing box and the liquid seal box cooperate to accommodate liquid, and the liquid level of the liquid in the air outlet channel is lower than the matching gap between the stuffing box and the stuffing cover.

[0010] In some embodiments, the first sealing assembly includes a packing material, a packing gap is formed between the stuffing box and the shaft body, the packing material is suitable for being arranged in the packing gap and contacting and sealing with the stuffing box and the shaft body, the stuffing cover is elastically connected to the stuffing box along the axial direction of the shaft body, and one end of the stuffing cover is suitable for extending into the packing gap and compressing the packing material to fill the packing gap.

[0011] In some embodiments, the air outlet is located at the lowest point of the air outlet channel.

[0012] In some embodiments, the volume of the space above the liquid level in the balance chamber is not less than the volume of the liquid entering the air outlet channel.

[0013] In some embodiments, the rotating sleeve is placed into the liquid sealing box from above, and a liquid inlet device is provided on the liquid sealing box. The liquid inlet device includes a liquid inlet pipe and a conduit. The liquid inlet pipe is connected to the upper part of the liquid sealing box, and the conduit is connected to the liquid inlet pipe inside the liquid sealing box. The liquid outlet end of the conduit is close to the bottom of the liquid sealing box.

[0014] In some embodiments, the liquid outlet end of the conduit is closer to the bottom of the liquid sealing box than the gas outlet.

[0015] Compared with the prior art, the beneficial effects of the present application are: the composite sealing structure of the present application realizes multiple seals through the cooperation of the packing sealing structure and the liquid sealing structure, which can effectively solve the problem of sealing performance degradation caused by long-term wear of the packing seal, and ensure the sealing effect. The liquid seal can store the gas overflowed from the packing sealing structure due to gas leakage through the balance chamber. At the same time, as the amount of liquid stored in the balance chamber increases, the increase in the liquid level can also increase the pressure of the liquid seal to a certain extent, thereby enhancing the ability of the liquid sealing structure to resist gas leakage, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure according to a preferred embodiment of the present application.

[0017] Figure 2 It is a cross-sectional structural view according to a preferred embodiment of the present application.

[0018] Figure 3 According to a preferred embodiment of the present application Figure 2 Magnified view at point a.

[0019] Figure 4 It is a schematic diagram of the arrangement of the liquid inlet device according to a preferred embodiment of the present application.

[0020] In the figure: 1. shaft; 2. first sealing assembly; 21. stuffing box; 22. stuffing material; 23. stuffing cover; 24. spring; 3. second sealing assembly; 31. rotating sleeve; 32. liquid seal box; 321. balance chamber; 33. air outlet channel; 331. air outlet; 4. air inlet device; 5. liquid level sensor; 6. liquid leakage sensor; 7. liquid inlet device; 71. liquid inlet pipe; 72. conduit. DETAILED DESCRIPTION

[0021] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0022] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0025] The present application will be further described below with reference to the accompanying drawings:

[0026] like Figures 1 to 4 As shown, the present application provides a composite sealing structure, including a first sealing component 2 and a second sealing component 3. The first sealing component 2 is arranged around the circumference of the shaft body 1. The shaft body 1 mentioned in this application generally refers to the stirring shaft body of the stirring equipment and other structures. The first sealing component 2 and the shaft body 1 are suitable for contact sealing. The second sealing component 3 includes a rotating sleeve 31 and a liquid sealing box 32. The rotating sleeve 31 is arranged on the shaft body 1. The rotating sleeve 31 cooperates with the outside of the first sealing component 2 and the shaft body 1 to form an outlet channel 33 with an air outlet 331. The liquid sealing box 32 is suitable for being fixed on the frame of the stirring equipment. The liquid sealing box 32 is arranged around the outside of the first sealing component 2. The liquid sealing box 32 is suitable for being filled with liquid. Part of the rotating sleeve 31 is suitable for extending into the liquid in the liquid sealing box 32, so that the liquid in the liquid sealing box 32 enters the outlet channel 33 and closes the air outlet 331.

[0027] In this application, the first sealing component 2 serves as the first line of sealing protection, directly contacting and sealing with the shaft body 1; the second sealing component 3 serves as the second line of sealing protection, and is used to assist the first sealing component 2 in strengthening the seal in the event of leakage in the first sealing component 2, thereby effectively reducing gas overflow and effectively solving the problem of gas leakage in the kettle during equipment operation.

[0028] The sealing method of the second sealing component 3 is liquid sealing, so the second sealing component 3 can realize the decoupling arrangement between the shaft body 1 and the frame, and can effectively reduce the interference of the frame on the movement of the shaft body 1.

[0029] The function of the rotating sleeve 31 is to seal the first sealing component 2 on all sides. Since the rotating sleeve 31 cannot be completely sealed due to structural interference when the shaft body 1 rotates, the liquid in the liquid seal box 32 can be used to supplement the unsealed structure of the rotating sleeve 31 (i.e., the air outlet 331), so that the rotating sleeve 31 can completely seal the first sealing component 2 on all sides during the movement of the shaft body 1.

[0030] It can be understood that since friction generates heat between the shaft body 1 and the first sealing component 2, the second sealing component 3 uses liquid for sealing, and utilizes the higher specific heat capacity of the liquid and the larger volume of the second sealing component 3 to help the shaft body 1 and the first sealing component 2 to guide heat dissipation, thereby reducing the wear between the shaft body 1 and the first sealing component 2 and improving the stability of the equipment operation.

[0031] like Figure 3 In the illustrated embodiment, the liquid sealing box 32 cooperates with the liquid on the outer side of the rotating sleeve 31 to form a balance cavity 321 . The balance cavity 321 is suitable for receiving liquid overflowing from the gas outlet channel 33 .

[0032] The main purpose of the balancing chamber 321 is to use the floating changes of the liquid level to compensate for the gas overflow at the first sealing component 2. The increase of gas in the outlet channel 33 will cause the pressure to increase, thereby forcing the liquid level in the outlet channel 33 to drop. After the liquid is squeezed out of the outlet channel 33, it can be stored in the balancing chamber 321. As long as there is liquid in the outlet channel 33, the sealing state can be maintained to ensure that the sealing effect will not fail, thereby improving the sealing stability of the second sealing component 3. When the gas in the outlet channel 33 decreases, the liquid flowing into the balancing chamber 321 can flow back into the outlet channel 33 and restore to the initial state.

[0033] The volume of the space above the liquid surface in the balancing chamber 321 is not less than the volume of the liquid entering the air outlet channel 33, and the volume of the liquid entering the air outlet channel 33 is not less than the volume of gas that may leak at the first sealing component 2 during a single production process of the equipment. This design can prevent gas leakage and liquid overflow, so that the structure of the second sealing component 3 is balanced, and the second sealing component 3 can recover by itself after each production.

[0034] It is worth noting that the balancing chamber 321 is an unclosed structure, or an incompletely closed structure. Considering that the rotating sleeve 31 and the liquid seal box 32 are in a movable fit, the balancing chamber 321 cannot be completely closed. However, structures such as rubber sleeves and bearings can be appropriately added between the rotating sleeve 31 and the liquid seal box 32 to improve the sealing performance of the balancing chamber 321, thereby reducing the probability of liquid overflowing from the balancing chamber 321 into the liquid seal box 32.

[0035] like Figure 2 and 4 In the embodiment shown, the air outlet 331 is located at the lowest point of the air outlet channel 33. Since the seal can be maintained before the effectively sealed liquid is completely discharged from the air outlet channel 33, this design allows the liquid reserve for effective sealing in the air outlet channel 33 to be as large as possible, thereby being able to cope with larger gas leakages at the first sealing component 2 and making the overall structure of the second sealing component 3 more compact.

[0036] Furthermore, the plane where the gas outlet 331 is located is a horizontal plane, which can reduce the amount of liquid that causes ineffective sealing at the gas outlet 331 and reduce the probability of premature gas leakage.

[0037] like Figures 1 to 4In the illustrated embodiment, a packing seal is provided between the first sealing assembly 2 and the shaft body 1. The packing seal refers to a sealing structure that generates a compressive force between the packing and the rotating parts and the fixed parts through the self-tightening effect of pre-tightening or medium pressure. The first sealing assembly 2 includes a stuffing box 21, a stuffing material 22 and a stuffing cover 23. A stuffing gap is formed between the stuffing box 21 and the shaft body 1. The stuffing material 22 is suitable for being arranged in the stuffing gap and is in contact and sealed with the stuffing box 21 and the shaft body 1. The stuffing cover 23 is elastically connected to the stuffing box 21 along the axial direction of the shaft body 1. The stuffing box 21 and the stuffing cover 23 are matched and connected along the circumferential direction of the shaft body 1. One end of the stuffing cover 23 is suitable for extending into the stuffing gap and compressing the stuffing material 22 to fill the stuffing gap.

[0038] In the present application, the more layers of the filler material 22 along the axial direction of the shaft body 1 , the better the sealing effect of the first sealing assembly 2 on the shaft body 1 , and multiple layers of filler material 22 can be arranged according to needs.

[0039] In some embodiments, the filler material 22 is made of materials such as asbestos fabric, carbon fiber, rubber, flexible graphite, and engineering plastics.

[0040] In some embodiments, a spring 24 is axially arranged between the stuffing cover 23 and the stuffing box 21. The spring 24 is limited and fixed by a guide pin. The spring 24 can make the stuffing cover 23 and the stuffing box 21 close to each other, thereby pressing the stuffing material 22 to fill the stuffing gap.

[0041] like Figure 3 In the embodiment shown, the liquid seal box 32 is arranged around the outside of the stuffing box 21. The stuffing box 21 and the liquid seal box 32 cooperate to accommodate the liquid. The liquid level in the gas outlet channel 33 is always lower than the fitting gap between the stuffing box 21 and the stuffing cover 23, thereby reducing the probability of the liquid in the gas outlet channel 33 overflowing to the fitting gap between the stuffing box 21 and the stuffing cover 23, thereby reducing the phenomenon of liquid entering the kettle through the stuffing material 22, thereby reducing the impact on the sealing effect of the first sealing assembly 2 and the impact on the stability of equipment production.

[0042] like Figure 2 and 3In the illustrated embodiment, an air intake device 4 is provided on the liquid seal box 32, and the air intake device 4 is connected to the balancing chamber 321. The air intake device 4 is suitable for inflating and pressurizing the balancing chamber 321 to limit the rising amplitude of the liquid level in the balancing chamber 321. When the gas pressure in the balancing chamber 321 is equal to the gas pressure in the gas outlet channel 33, the liquid levels in the balancing chamber 321 and the gas outlet channel 33 can maintain balance. When the gas pressure in the balancing chamber 321 is greater than the gas pressure in the gas outlet channel 33, the liquid level in the balancing chamber 321 drops and the liquid level in the gas outlet channel 33 rises. When the gas pressure in the balancing chamber 321 is less than the gas pressure in the gas outlet channel 33, the liquid level in the balancing chamber 321 rises and the liquid level in the gas outlet channel 33 drops. The air intake device 4 can control the liquid level through this principle to achieve stable sealing.

[0043] In this embodiment, considering the movable cooperation between the rotating sleeve 31 and the liquid sealing box 32, even if the balancing chamber 321 is connected to the outside world, the air intake device 4 can also increase the inflation speed to achieve overall pressurization in the balancing chamber 321, thereby controlling the decline of the liquid level in the balancing chamber 321, and finally causing the liquid level in the air outlet channel 33 to rise.

[0044] In some embodiments, the air intake device 4 is an air pump.

[0045] like Figure 3 In the embodiment shown, a liquid level sensor 5 is provided on the path of rising liquid level in the balancing chamber 321. When the liquid level sensor 5 is triggered, the air intake device 4 is suitable for inflating and pressurizing the balancing chamber 321 to prevent the liquid level in the balancing chamber 321 from further rising. The liquid level sensor 5 is preferably arranged below the air intake device 4, which can effectively prevent the air intake device 4 from being submerged in liquid and causing failure.

[0046] like Figure 3 In the embodiment shown, the liquid seal box 32 is provided with a liquid leakage sensor 6 at the liquid overflow position. When the liquid leakage sensor 6 is triggered, the air inlet device 4 is adapted to inflate and pressurize the balance chamber 321. Since the second sealing component 3 is not a fully enclosed structure, there are possible leakage points or liquid overflow positions (in this application, the liquid overflow position is generally set to the top of the balance chamber 321, Figure 3 The leakage sensor 6 is only for illustration, and the actual position can be adjusted). The leakage sensor 6 can be arranged at the corresponding position. When the leakage sensor 6 is triggered, the air intake device 4 can take corresponding inflation measures.

[0047] It is worth noting that, since the balancing chamber 321 is connected to the outside, the air intake device 4 generally only needs to have an inflation function but does not need to have an exhaust function, and only allows the balancing chamber 321 to exhaust by itself.

[0048] In some embodiments, the liquid in the liquid sealing box 32 is water, and the raw materials are easy to obtain, low in cost, and pollution-free.

[0049] In some embodiments, the rotating sleeve 31 is placed into the liquid sealing box 32 from above. A liquid inlet device 7 is provided on the liquid sealing box 32. The liquid inlet device 7 includes a liquid inlet pipe 71 and a conduit 72. The liquid inlet pipe 71 is connected to the upper part of the liquid sealing box 32. The conduit 72 is connected to the liquid inlet pipe 71 inside the liquid sealing box 32. The liquid outlet end of the conduit 72 is close to the bottom of the liquid sealing box 32. The conduit 72 of the liquid inlet device 7 is designed to adapt to the injection of water into the liquid sealing box 32 and effectively and stably close the air outlet channel 33 to reduce liquid splashing.

[0050] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments. The above embodiments and the specification only describe the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application to be protected, and the scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A composite sealing structure, characterized in that: The invention also provides a novel sealing structure for the sealing member, wherein the sealing member is provided on the outer side of the first sealing member and the outer side of the first sealing member, wherein the sealing member is provided with a packing seal, and the sealing member is provided with a rotating sleeve and a liquid seal box, wherein the rotating sleeve is provided on the shaft body, and the rotating sleeve cooperates with the outer side of the first sealing member and the shaft body to form an outlet channel having an air outlet, and the liquid seal box is provided on the outer side of the first sealing member, wherein the liquid seal box is suitable for being filled with liquid, and a part of the rotating sleeve is suitable for extending into the liquid in the liquid seal box so that the liquid in the liquid seal box enters the outlet channel and closes the air outlet, and the liquid seal box cooperates with the liquid on the outer side of the rotating sleeve to form a balance chamber, and the balance chamber is suitable for receiving liquid overflowing from the outlet channel.

2. A composite sealing structure according to claim 1, characterized in that: The liquid sealing box is provided with an air intake device, which is connected to the balance chamber and is suitable for inflating and pressurizing the balance chamber to limit the rising range of the liquid level in the balance chamber.

3. A composite sealing structure according to claim 2, characterized in that: A liquid level sensor is provided in the balance chamber on the liquid level rising path. When the liquid level sensor is triggered, the air intake device is adapted to inflate and pressurize the balance chamber.

4. A composite sealing structure according to claim 2, characterized in that: The liquid sealing box is provided with a liquid leakage sensor at the liquid overflow position. When the liquid leakage sensor is triggered, the air intake device is adapted to inflate and pressurize the balance cavity.

5. The composite sealing structure according to claim 1, wherein: The first sealing assembly includes a stuffing box and a stuffing cover, the stuffing box and the stuffing cover are matched and connected along the circumference of the shaft, the liquid seal box is arranged around the outside of the stuffing box, the stuffing box and the liquid seal box cooperate to accommodate liquid, and the liquid level of the liquid in the air outlet channel is lower than the matching gap between the stuffing box and the stuffing cover.

6. A composite sealing structure according to claim 5, characterized in that: The first sealing assembly includes a packing material, and a packing gap is formed between the stuffing box and the shaft body. The packing material is suitable for being arranged in the packing gap and contacting and sealing with the stuffing box and the shaft body. The stuffing cover is elastically connected to the stuffing box along the axial direction of the shaft body, and one end of the stuffing cover is suitable for extending into the packing gap and compressing the packing material to fill the packing gap.

7. The composite sealing structure according to claim 1, wherein: The air outlet is located at the lowest point of the air outlet channel.

8. The composite sealing structure according to claim 1, wherein: The volume of the space above the liquid level in the balance chamber is not less than the volume of the liquid entering the air outlet channel.

9. The composite sealing structure according to claim 1, wherein: The rotating sleeve is placed into the liquid sealing box from above. The liquid sealing box is provided with a liquid inlet device, which includes a liquid inlet pipe and a conduit. The liquid inlet pipe is connected to the upper part of the liquid sealing box, and the conduit is connected to the liquid inlet pipe inside the liquid sealing box. The liquid outlet end of the conduit is close to the bottom of the liquid sealing box.

10. The composite sealing structure according to claim 9, characterized in that: The liquid outlet end of the conduit is closer to the bottom of the liquid sealing box than the air outlet.

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