A two-stage high-temperature leak-proof sealing device

Abstract

This utility model relates to the technical field of high-temperature sealing structures for shafts, specifically a two-stage high-temperature leak-proof sealing device. It is mounted on a main shaft and includes a hard alloy bushing fixedly fitted to the high-temperature end of the main shaft. The first cooling bushing structure on the main shaft includes a heat-conducting bushing with an annular hollow cavity inside, connected to a heat-conducting oil inlet and outlet. The second cooling bushing structure on the main shaft includes a sealing bushing fixedly fitted to the main shaft. An oil-based bushing is fitted over the sealing bushing, also with an annular hollow cavity inside, storing heat-conducting oil. A water-based bushing is fitted over the oil-based bushing, with an annular hollow cavity inside, connected to a water inlet and outlet. This utility model solves the technical problem of simultaneously achieving high-temperature isolation and sealing in shaft drives.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature sealing structures for shafts, and more specifically, to a two-stage high-temperature leak-proof sealing device. Background Technology

[0002] In high-temperature applications of shaft transmission equipment (such as high-temperature oil and gas pipelines and high-temperature material reaction devices), the sealing performance and high-temperature resistance of the spindle directly affect the operational stability and service life of the equipment. Ordinary high-temperature mechanical seals have a stable operating temperature limit of only 300℃, which cannot meet the requirements of high-temperature conditions above 400℃. While hard alloy mechanical seals that can withstand temperatures below 400℃ have a manufacturing cost several times higher than ordinary mechanical seals, their high cost makes them unsuitable for large-scale application in actual production.

[0003] Existing mechanical seal devices often have separate sealing structures and cooling components, resulting in the high-temperature conduction path not being effectively blocked. Heat from the high-temperature end of the spindle can be quickly conducted to the transmission end, which can not only damage the seals but also cause the drive equipment to overheat and shut down. At the same time, the sealing gap is prone to leakage due to thermal expansion and contraction under high-temperature conditions.

[0004] Existing sealing issues result in shafts having short service life, high maintenance costs, and low sealing reliability under high-temperature and high-pollution conditions, making it difficult to meet the needs of large-scale industrial production and long-term stable operation. Utility Model Content

[0005] The purpose of this application is to provide a two-stage high-temperature leak-proof sealing device, which solves the technical problem of simultaneously achieving high-temperature isolation and sealing under shaft transmission.

[0006] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0007] A two-stage high-temperature leak-proof sealing device is sleeved on a main shaft. The first shaft end of the main shaft is set as the high-temperature end, and the second shaft end is set as the transmission end. The two-stage high-temperature leak-proof sealing device includes a carbide bushing.

[0008] Preferably, the carbide bushing is fixedly sleeved on the spindle and close to the high-temperature end of the spindle.

[0009] Preferably, the main shaft is provided with a first cooling bushing structure and a first cooling bushing structure in sequence.

[0010] Preferably, the first cooling bushing structure includes a heat-conducting bushing, which is sleeved on the main shaft. The heat-conducting bushing has an annular hollow cavity inside, and a heat-conducting oil inlet and a heat-conducting oil outlet are respectively connected to the heat-conducting bushing.

[0011] Preferably, the second cooling bushing structure includes a sealing bushing, which is fixedly sleeved on the main shaft. An oil bushing is fixedly sleeved outside the sealing bushing, and an annular hollow cavity is also provided inside the oil bushing, wherein heat-conducting oil is stored in the cavity.

[0012] Preferably, the oil-based bushing is fitted with a water-based bushing, the water-based bushing having an annular hollow cavity inside, and the water-based bushing being connected to an inlet and an outlet.

[0013] Preferably, the carbide bushing is externally fixed with a retaining ring, which is fixedly connected to the main shaft.

[0014] Preferably, the heat transfer oil inlet is located at one axial end of the heat transfer sleeve near the high-temperature end, and is connected to the hollow cavity and the external oil pump assembly.

[0015] Preferably, the heat transfer oil outlet is located at one axial end of the heat transfer sleeve near the transmission end, and is connected to the hollow cavity and the external oil pump assembly respectively.

[0016] Preferably, a spiral blade is fixedly installed inside the annular hollow cavity of the heat-conducting bushing. The two sides of the width of the spiral blade abut against the inner and outer ring walls of the annular hollow cavity, and the interior of the hollow cavity is divided into a spiral-shaped flow channel by the spiral blade.

[0017] Preferably, the hollow cavity of the oil bushing is also connected to an oil pipe, which is connected to an oil storage tank in the external environment, and there is oil pressure between the oil storage tank space and the hollow cavity.

[0018] Preferably, the hollow cavity of the water quality bushing is provided with circulating water, and one axial end of the water quality bushing is a water inlet, which connects the hollow cavity to an external water pump device.

[0019] Preferably, the other axial end of the water quality bushing is a water outlet, which connects the hollow cavity to an external water pump device.

[0020] Preferably, sealing rings are provided between the sealing bushing and the main shaft, between the sealing bushing and the oil bushing, and between the oil bushing and the water bushing.

[0021] Preferably, a nitrogen pipe is provided between the first cooling bushing structure and the second cooling bushing structure. One end of the nitrogen pipe is inserted into the gap between the main shaft and the heat-conducting bushing and the oil bushing, while the other end of the nitrogen pipe is connected to an external air pump.

[0022] The technical solution of this application has at least the following advantages and beneficial effects:

[0023] This invention ensures the reliability of the high-temperature end seal by setting the high-temperature resistance characteristics of the hard alloy bushing (withstanding temperatures above 400℃), and by using two-stage cooling to allow the subsequent sealing components to use ordinary mechanical seals. While meeting the requirements of ultra-high temperature working conditions, it reduces the equipment manufacturing and maintenance costs.

[0024] This invention features a first-stage cooling bushing structure. By utilizing the continuously flowing heat-conducting oil inside the heat-conducting bushing, the heat of the main shaft is initially removed. Furthermore, the built-in spiral blades form a spiral flow channel, extending the residence time of the heat-conducting oil and improving the heat absorption and cooling effect.

[0025] This invention incorporates a second-stage cooling bushing structure, employing a composite structure of oil-based and water-based bushings. The oil-based bushing further absorbs heat from the main shaft using oil, and then maintains oil pressure by connecting to an oil storage tank via an oil pipe, preventing insufficient oil due to thermal expansion and contraction within the bushing. Subsequently, circulating water is introduced through an external water-based bushing to remove the heat from the oil-based bushing, achieving further cooling and reducing the main shaft temperature to below 300°C. This allows for the use of a lower-cost conventional mechanical seal to seal the main shaft, reducing sealing costs.

[0026] This invention installs a nitrogen pipe between the first and second cooling bushing sections, continuously pumping nitrogen into the bushing through an external air pump. This creates a pressure barrier between the main shaft and the bushing, preventing high-temperature oil vapors and dust particles from entering the bushing gaps. This avoids friction and wear caused by contaminants and extends the service life of the bushing. Attached Figure Description

[0027] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0028] Figure 2 This utility model Figure 1 A magnified structural diagram of A in the middle.

[0029] In the diagram: 1-spindle, 2-mounting plate, 3-carbide bushing, 4-retaining ring, 5-thermal conductive bushing, 6-thermal oil inlet, 7-thermal oil outlet, 8-spiral plate, 9-sealing bushing, 10-oil bushing, 11-oil pipe, 12-water bushing, 13-water inlet, 14-water outlet, 15-sealing ring, 16-nitrogen pipe. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, 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 or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Example

[0033] Please refer to Figures 1-2 This utility model provides a two-stage high-temperature leak-proof sealing device for sealing the transmission of the main shaft 1 under high-temperature conduction. The main shaft 1 serves as a transmission connector, with its first shaft end configured as the high-temperature end and its second shaft end configured as the transmission end.

[0034] The two-stage high-temperature leak-proof sealing device includes a hard alloy bushing 3, which is fixedly sleeved on the outside of the main shaft 1 and close to the high-temperature end of the main shaft 1. Utilizing its high-temperature resistance, the hard alloy bushing 3 seals the surface of the main shaft 1 at the high-temperature end, thus performing a preliminary seal on the main shaft 1.

[0035] The carbide bushing 3 is provided with a retaining ring 4 on its outer fixed sleeve. The retaining ring 4 is fixedly connected to the main shaft 1. The retaining ring 4 further restricts the axial sliding of the carbide bushing 3, reducing the displacement of the carbide bushing 3 due to vibration when the main shaft 1 transmits vibration.

[0036] Furthermore, during the actual transmission process of the spindle 1, the high temperature in some working environments can easily be conducted to other equipment through the spindle 1, causing some equipment to overheat and stop or even be damaged. In view of the above situation, in this embodiment, two cooling bushing structures are also provided on the spindle 1, which are sequentially sleeved between the carbide bushing 3 and the transmission end of the spindle 1, to slow down the conduction of high temperature and further seal the transmission position of the spindle 1.

[0037] Please refer to the following: Figure 1The first cooling bushing structure includes a heat-conducting bushing 5, a heat-conducting oil inlet 6, a heat-conducting oil outlet 7, and a threaded plate.

[0038] Specifically, the heat-conducting sleeve 5 is fitted onto the main shaft 1. The heat-conducting sleeve 5 has an annular hollow cavity inside for the flow of heat-conducting oil. The heat-conducting sleeve 5 is provided with a heat-conducting oil inlet 6 and a heat-conducting oil outlet 7. The heat-conducting oil inlet 6 is located at the axial end of the heat-conducting sleeve 5 near the high-temperature end, and is connected to the hollow cavity and the external oil pumping assembly. It is used to pump the low-temperature heat-conducting oil from the outside into the hollow cavity to absorb heat from the main shaft 1. The heat-conducting oil outlet 7 is located at the axial end of the heat-conducting sleeve 5 near the transmission end, and is connected to the hollow cavity and the external oil pumping assembly. It is used to pump the heat-conducting oil that has absorbed heat and heated up in the hollow cavity out to the outside, so as to realize the flow of heat-conducting oil in the hollow cavity and maintain the continuous heat absorption function of the heat-conducting oil.

[0039] Preferably, when the high temperature at the high-temperature end of the spindle 1 is conducted towards the transmission end, it passes through the first cooling bushing on the spindle 1. The heat-conducting oil continuously flowing inside the heat-conducting bushing 5 absorbs the heat from the spindle 1, initially cooling the spindle 1 and reducing heat conduction on the spindle 1. Moreover, the heat-conducting oil preferentially flows in from the axial end closer to the high-temperature end, which can more quickly dissipate the heat from the spindle 1 and accelerate the cooling effect of the spindle 1.

[0040] In addition, to improve the cooling effect, a spiral blade is fixedly installed in the hollow cavity of the annular heat-conducting sleeve 5. The two sides of the width of the spiral blade abut against the inner and outer ring walls of the annular hollow cavity, thereby dividing the inner part of the hollow cavity into a spiral flow channel, increasing the continuous flow time of the heat-conducting oil in the hollow cavity, thereby increasing the heat transfer time between the main shaft 1 and the heat-conducting oil, so that the heat-conducting oil can carry away more heat and improve the cooling effect.

[0041] For further details, please refer to... Figure 2 The second cooling bushing structure includes a sealing bushing 9, an oil bushing 10, an oil pipe 11, a water bushing 12, a water inlet 13, and a water outlet 14.

[0042] Specifically, the sealing bushing 9 is fixedly sleeved on the main shaft 1, located between the first cooling bushing and the transmission end of the main shaft 1. The sealing bushing 9 seals against the surface of the main shaft 1 for a sealed connection. An oil bushing 10 is fixedly sleeved outside the sealing bushing 9. The oil bushing 10 also has an annular hollow cavity inside, in which heat-conducting oil is stored. The heat-conducting oil contacts the outer surface of the sealing bushing 9 to conduct heat on the main shaft 1 and further cool the main shaft 1. An oil pipe 11 is also connected to the hollow cavity of the oil bushing 10. The oil pipe 11 is connected to an oil tank in the external environment. There is oil pressure between the oil tank space and the hollow cavity. When the entire oil bushing 10 undergoes thermal expansion and contraction due to changes in the working environment temperature, the extra oil stored in the external oil tank and the maintained oil pressure can keep the hollow cavity full of heat-conducting oil when the volume of the hollow cavity changes due to temperature differences.

[0043] Specifically, a water-based bushing 12 is fixedly fitted outside the oil-based bushing 10. The water-based bushing 12 also has an annular hollow cavity inside, through which circulating water flows. An inlet 13 is provided at one axial end of the water-based bushing 12, which connects the hollow cavity to an external water pump device to introduce cold water into the hollow cavity to absorb the heat conducted from the oil-based bushing 10. An outlet 14 is provided at the other axial end of the water-based bushing 12, which connects the hollow cavity to an external water pump device to discharge the hot water that has absorbed heat from the hollow cavity, thereby promoting the flow of circulating water in the water-based bushing 12 and increasing the cooling effect.

[0044] Preferably, considering actual production needs, a sealed bushing 9 is used instead of a hard alloy bushing 3 to reduce the cost of the sealing structure; a non-flowing oil bushing 10 is used instead of a flowable oil-conducting bushing 5 to reduce cooling costs (the non-flowing oil bushing 10 will also experience thermal expansion and contraction due to temperature accumulation); and using a flowable water bushing 12 to improve the flow of heat-conducting oil can further reduce cooling costs (circulating water has low costs). Moreover, because of the oil barrier, the flowing water will not directly contact the spindle (at which point the spindle temperature is above 100°C), accelerating cooling while also preventing the spindle from easily vaporizing due to direct water cooling, thus improving the safety of the bushing structure.

[0045] Preferably, the reason for using heat-conducting oil in the cooling bushing structure is that oil can absorb and store more heat than circulating water, thus resulting in a better heat absorption and cooling effect.

[0046] Furthermore, in this embodiment, sealing rings 15 are provided between the sealing sleeve 9 and the main shaft 1, between the sealing sleeve 9 and the oil sleeve 10, and between the oil sleeve 10 and the water sleeve 12, to seal the inner and outer sleeves and reduce the possibility of oil or water leakage. The sealing rings 15 are only provided in the second cooling sleeve structure because the main shaft 1 is initially cooled by the first cooling sleeve structure, and its temperature decreases, thus preventing damage to the sealing rings 15.

[0047] Furthermore, in some implementation scenarios, the shaft end of the main shaft 1 will pass through a high-temperature oil and gas pipeline to transmit power to the structure inside the pipeline. This puts the main shaft 1 in a high-temperature environment, making it easy for this end (i.e., the high-temperature end in the above embodiment) to transmit high temperature to the drive end (i.e., the transmission end) at the other end, affecting the normal operation of the drive equipment. Moreover, some high-temperature oil and gas transportation involves dust particles, which can easily enter the sealing gap of the bushing through the hole of the main shaft 1, increasing the wear of the bushing and affecting the transmission operation.

[0048] To address the aforementioned issues, in this embodiment, a nitrogen pipe 16 is installed between the first and second cooling bushing structures. One end of the nitrogen pipe 16 is inserted into the gap between the main shaft 1 and the heat-conducting bushing 5 and the oil-based bushing 10, while the other end is connected to an external air pump. The air pump is constantly under pressure, pressing nitrogen into the sealing gaps between the main shaft 1 and each bushing and maintaining a certain pressure. When dust particles in the oil-gas pipe seep into the space between the main shaft 1 and the bushings through the pipe pressure, they are blocked by the pressurized nitrogen, thereby reducing the occurrence of dust particles entering the bushing gaps and improving the service life of the bushings.

[0049] Furthermore, in a specific implementation scenario, the main shaft 1, as a transmission component, will rotate. At this time, the various bushings set on the main shaft 1 and the external pump pressure equipment connected to them are prone to entanglement due to rotation. Therefore, in this embodiment, a mounting plate 2 is also fitted outside the main shaft 1. The mounting plate 2 is fixedly connected to the heat-conducting bushing 5, and the pump pressure equipment matched with each bushing is fixedly installed on the mounting plate 2 so that it rotates with the main shaft 1 to avoid the problem of entanglement of various pipelines.

[0050] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. A two-stage high-temperature leak-proof sealing device, which is sleeved on a main shaft (1), a first shaft end of the main shaft (1) is arranged as a high-temperature end, and a second shaft end is arranged as a transmission end, characterized in that, Including carbide bushings (3); The carbide bushing (3) is fixedly sleeved on the spindle (1) and close to the high-temperature end of the spindle (1); The main shaft (1) is provided with a first cooling bushing structure and a second cooling bushing structure in sequence; The first cooling bushing structure includes a heat-conducting bushing (5), which is sleeved on the main shaft (1). The heat-conducting bushing (5) has an annular hollow cavity inside, and the heat-conducting bushing (5) is connected to a heat-conducting oil inlet (6) and a heat-conducting oil outlet (7). The second cooling bushing structure includes a sealing bushing (9), which is fixedly sleeved on the main shaft (1). An oil bushing (10) is fixedly sleeved outside the sealing bushing (9). An annular hollow cavity is also provided inside the oil bushing (10), in which heat-conducting oil is stored. The oil-based bushing (10) is covered with a water-based bushing (12). The water-based bushing (12) has an annular hollow cavity inside. The water-based bushing (12) is connected to an inlet (13) and an outlet (14).

2. A two-stage high temperature leak-tight sealing device as claimed in claim 1, wherein, The carbide bushing (3) is fitted with a retaining ring (4) on its outer fixed sleeve, and the retaining ring (4) is fixedly connected to the main shaft (1).

3. A two-stage high temperature leak-tight sealing device as claimed in claim 1, wherein, The heat transfer oil inlet (6) is located at one axial end of the heat transfer sleeve (5) near the high temperature end, and is connected to the hollow cavity and the external pump oil assembly respectively; The heat transfer oil outlet (7) is located at one axial end of the heat transfer sleeve (5) near the transmission end, and is connected to the hollow cavity and the external oil pump assembly respectively.

4. The two-stage high-temperature leak-proof sealing device according to claim 3, characterized in that, The heat-conducting bushing (5) is also fixedly provided with a spiral blade in the annular hollow cavity. The two sides of the width of the spiral blade abut against the inner and outer ring walls of the annular hollow cavity, and the interior of the hollow cavity is divided into a spiral flow channel by the spiral blade.

5. A two-stage high-temperature leak-proof sealing device according to claim 1, characterized in that, The hollow cavity of the oil bushing (10) is also connected to an oil pipe (11), which is connected to an oil storage tank in the external environment. There is oil pressure between the oil storage tank space and the hollow cavity.

6. A two-stage high-temperature leak-proof sealing device according to claim 1, characterized in that, The hollow cavity of the water quality bushing (12) is provided with circulating water, and one axial end of the water quality bushing (12) is a water inlet (13), which connects the hollow cavity with an external water pump device. The other axial end of the water quality bushing (12) is the water outlet (14), which connects the hollow cavity to the external water pump device.

7. A two-stage high-temperature leak-proof sealing device according to claim 1, characterized in that, A sealing ring (15) is provided between the sealing bushing (9) and the main shaft (1), between the sealing bushing (9) and the oil bushing (10), and between the oil bushing (10) and the water bushing (12).

8. A two-stage high-temperature leak-proof sealing device according to claim 1, characterized in that, A nitrogen pipe (16) is provided between the first cooling bushing structure and the second cooling bushing structure. One end of the nitrogen pipe (16) is inserted into the gap between the main shaft (1) and the heat-conducting bushing (5) and the oil bushing (10), while the other end of the nitrogen pipe (16) is connected to an external air pump.

Images