CN104633128A - Device for improving magnetic liquid sealing pressure endurance capacity - Google Patents
Device for improving magnetic liquid sealing pressure endurance capacity Download PDFInfo
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- CN104633128A CN104633128A CN201510044941.XA CN201510044941A CN104633128A CN 104633128 A CN104633128 A CN 104633128A CN 201510044941 A CN201510044941 A CN 201510044941A CN 104633128 A CN104633128 A CN 104633128A
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- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 239000007788 liquid Substances 0.000 title abstract description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000011553 magnetic fluid Substances 0.000 claims 10
- 230000005389 magnetism Effects 0.000 claims 6
- 239000007789 gas Substances 0.000 abstract description 29
- 230000001105 regulatory effect Effects 0.000 abstract description 28
- 238000002955 isolation Methods 0.000 abstract description 11
- 239000002360 explosive Substances 0.000 abstract description 6
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 description 8
- 230000004323 axial length Effects 0.000 description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
一种提高磁性液体密封耐压能力的装置，属于机械工程密封领域。使现有磁性液体密封装置所能承受的最大耐压值得到了极大提高。该装置包括外壳(1)、左电控阀门(2)、储气罐(3)、左极靴(4)、永磁体(5)、压差传感器(6)、右极靴(7)、右电控阀门(8)、高压泵(9)、密封组件(10)、挡圈(11)、右隔磁环(12)、左隔磁环(13)等零件。所述的磁性液体密封装置通过差动阀调节调压腔室I和II的压差，为现有磁性液体密封装置在高压环境下解决易燃、易爆、高腐蚀性气体的密封问题提供了有效方案。
The invention relates to a device for improving the pressure resistance capacity of a magnetic liquid seal, which belongs to the field of mechanical engineering seals. The maximum withstand pressure value that the existing magnetic liquid sealing device can withstand has been greatly improved. The device includes a casing (1), a left electric control valve (2), an air storage tank (3), a left pole piece (4), a permanent magnet (5), a differential pressure sensor (6), a right pole piece (7), Right electric control valve (8), high-pressure pump (9), sealing assembly (10), retaining ring (11), right magnetic isolation ring (12), left magnetic isolation ring (13) and other parts. The magnetic liquid sealing device adjusts the pressure difference between the pressure regulating chambers I and II through the differential valve, which provides a solution for the existing magnetic liquid sealing device to solve the sealing problem of flammable, explosive and highly corrosive gases in a high-pressure environment. Effective program.
Description
技术领域technical field
本发明属于机械工程密封领域。The invention belongs to the field of mechanical engineering sealing.
背景技术Background technique
磁性液体密封技术由于其具有零泄漏、无磨损，寿命长，结构简单等优点逐渐被越来越多的行业所使用，其中的零泄漏性能更是其他密封形式难以达到的。现有磁性液体旋转密封装置典型结构如公开号为CN 102518811A和公开号为CN 202091519U的专利申请所述。现有的磁性液体旋转密封装置的最大耐压能力虽然可以达到7MPa，但其轴向长度已经超过1m，而磁性液体密封极齿与转轴的单边间隙通常在0.1～0.3mm，当轴向长度过长时，转轴的跳动很容易造成磁性液体密封极齿与转轴刮蹭，从而使磁性液体密封失效。如何在不增加轴向长度的情况下提高耐压能力，一直是磁性液体密封领域的难题，尤其是在高压环境下密封易燃、易爆、高腐蚀性气体时，对其可靠性提出了更高的要求。The magnetic liquid sealing technology has gradually been used by more and more industries due to its advantages of zero leakage, no wear, long life and simple structure, and the zero leakage performance is difficult to achieve by other sealing forms. The typical structure of the existing magnetic liquid rotary sealing device is as described in the patent applications with publication numbers CN 102518811A and CN 202091519U. Although the maximum pressure resistance of the existing magnetic liquid rotary seal device can reach 7MPa, its axial length has exceeded 1m, while the unilateral gap between the magnetic liquid seal pole teeth and the rotating shaft is usually 0.1-0.3mm, when the axial length When it is too long, the beating of the rotating shaft will easily cause the pole teeth of the magnetic liquid seal to scratch against the rotating shaft, thereby making the magnetic liquid seal invalid. How to improve the pressure resistance without increasing the axial length has always been a difficult problem in the field of magnetic liquid sealing, especially when sealing flammable, explosive, and highly corrosive gases in a high-pressure environment, more requirements have been put forward for its reliability. high demands.
发明内容Contents of the invention
本发明需要解决的技术问题是，现有的磁性液体密封装置在提高耐压能力的同时会增加轴向长度，降低可靠性，使得其无法应用在高压环境下，尤其是无法在高压环境下密封易燃、易爆、高腐蚀性气体。因此提供一种提高磁性液体密封耐压能力的装置。The technical problem to be solved by the present invention is that the existing magnetic liquid sealing device will increase the axial length and reduce the reliability while improving the pressure resistance, so that it cannot be applied in a high-pressure environment, especially it cannot be sealed in a high-pressure environment. Flammable, explosive, highly corrosive gas. Therefore, a device for improving the pressure resistance of the magnetic liquid seal is provided.
本发明解决其技术问题所采用的技术方案是：The technical solution adopted by the present invention to solve its technical problems is:
一种提高磁性液体密封耐压能力的装置，构成该装置包括：A device for improving the pressure resistance of a magnetic liquid seal, comprising:
外壳、左电控阀门、储气罐、左极靴、永磁体、压差传感器、右极靴、右电控阀门、高压泵、密封组件、挡圈、右隔磁环、左隔磁环；Shell, left electric control valve, gas storage tank, left pole shoe, permanent magnet, differential pressure sensor, right pole shoe, right electric control valve, high pressure pump, seal assembly, retaining ring, right magnetic isolation ring, left magnetic isolation ring;
所述左极靴、永磁体和右极靴形成磁性液体密封组件，磁性液体密封组件左侧腔室为调压腔室I，右侧与密封组件形成调压腔室II；所述左电控阀门、压差传感器和右电控阀门形成差动阀，差动阀气口a与外壳左侧通孔a1固定连接，差动阀气口b与外壳右侧通孔b1固定连接，差动阀气口c与高压泵固定连接，差动阀气口d与储气罐固定连接；挡圈与外壳固定连接，并将左隔磁环、左极靴、永磁体、右极靴、右隔磁环和密封组件轴向定位。需要被密封的高压气体被磁性液体密封组件隔断在调压腔室I内，通过左电控阀门控制调压腔室I内的气体压强。当调压腔室I内的气体压强过大时，如果被密封气体价格低廉或不具有易燃、易爆、高腐蚀性，可以通过左电控阀门将其直接排出，如果被密封气体价格昂贵或具有易燃、易爆、高腐蚀性，可以通过左电控阀门将其排入储气罐中封存，确保了零泄漏量。通过高压泵将外界空气或其他气体泵入到调压腔室II中，通过右电控阀门控制流入调压腔室II内空气的流量与从密封组件处所泄漏的空气流量的差值，使得调压腔室II内的气体压力趋于稳定。通过压差传感器可以检测调压腔室I与调压腔室II之间的压力差，使其小于磁性液体密封组件的最大耐压值，实现密封的动态平衡，达到了在不增加轴向长度的情况下，使耐压能力远远大于现有技术所能承受的最大耐压值，突破了现有技术耐压能力的瓶颈。The left pole piece, the permanent magnet and the right pole piece form a magnetic liquid sealing assembly, the left chamber of the magnetic liquid sealing assembly is a pressure regulating chamber I, and the right side and the sealing assembly form a pressure regulating chamber II; the left electric control The valve, differential pressure sensor and right electric control valve form a differential valve. The differential valve port a is fixedly connected to the through hole a1 on the left side of the casing, the differential valve port b is fixedly connected to the through hole b1 on the right side of the casing, and the differential valve port c It is fixedly connected with the high-pressure pump, and the air port d of the differential valve is fixedly connected with the gas storage tank; the retaining ring is fixedly connected with the casing, and the left spacer magnetic ring, left pole shoe, permanent magnet, right pole shoe, right magnetic spacer ring and sealing assembly Axial positioning. The high-pressure gas that needs to be sealed is isolated in the pressure regulating chamber 1 by the magnetic liquid sealing assembly, and the gas pressure in the pressure regulating chamber 1 is controlled by the left electric control valve. When the pressure of the gas in the pressure regulating chamber I is too high, if the sealed gas is cheap or not flammable, explosive, or highly corrosive, it can be discharged directly through the left electric control valve; if the sealed gas is expensive Or it is flammable, explosive, and highly corrosive, and it can be discharged into the gas storage tank through the left electric control valve for storage, ensuring zero leakage. The outside air or other gases are pumped into the pressure regulating chamber II through a high-pressure pump, and the difference between the flow of air flowing into the pressure regulating chamber II and the air flow leaking from the sealing assembly is controlled by the right electric control valve, so that the regulator The gas pressure in the pressure chamber II tends to be stable. The differential pressure sensor can detect the pressure difference between the pressure regulating chamber I and the pressure regulating chamber II, making it less than the maximum withstand pressure value of the magnetic liquid seal assembly, realizing the dynamic balance of the seal, and achieving the goal without increasing the axial length Under the circumstances, the pressure resistance capacity is far greater than the maximum pressure resistance value that the existing technology can withstand, breaking through the bottleneck of the current technology pressure resistance capacity.
所述外壳在左极靴的左侧加工有通孔a1，在右极靴右侧与密封组件左侧加工有通孔b1。所述左隔磁环加工有通孔a2，该通孔与外壳的通孔a1同轴，所述右隔磁环加工有通孔b2，该通孔与外壳的通孔b1同轴。外壳上的通孔a1、b1分别与隔磁环上的通孔a2、b2同轴，形成了气体流通通道，使得差动阀可以有效控制与检测调压腔室I和调压腔室II内的压力。The housing is processed with a through hole a1 on the left side of the left pole piece, and a through hole b1 is processed on the right side of the right pole piece and the left side of the sealing assembly. The left magnetic isolation ring is processed with a through hole a2, which is coaxial with the through hole a1 of the housing, and the right magnetic isolation ring is processed with a through hole b2, which is coaxial with the through hole b1 of the housing. The through-holes a1 and b1 on the casing are coaxial with the through-holes a2 and b2 on the magnetic isolation ring respectively, forming a gas circulation channel, so that the differential valve can effectively control and detect the pressure in the pressure regulating chamber I and the pressure regulating chamber II. pressure.
所述密封组件采用有一定泄漏率的非接触密封方式，如迷宫密封、机械密封或干气密封等方式。磁性液体密封装置是目前唯一的一种能够密封气体达到零泄漏的非接触密封方式，但其缺点是耐压能力小，而迷宫密封、机械密封或干气密封虽然耐压能力高，但都不能做到零泄漏。通过将这种高耐压能力的非接触密封方式串接在磁性液体密封组件后端，利用其耐压能力高，可靠性高的优点，结合高压泵和差动阀使调压腔室II内形成一个稳定的高压空气环境。The sealing assembly adopts a non-contact sealing method with a certain leakage rate, such as a labyrinth seal, a mechanical seal or a dry gas seal. The magnetic liquid sealing device is currently the only non-contact sealing method that can seal the gas to achieve zero leakage, but its disadvantage is that the pressure resistance is small, while the labyrinth seal, mechanical seal or dry gas seal have high pressure resistance, but they cannot Achieve zero leakage. By connecting this non-contact sealing method with high pressure resistance in series to the rear end of the magnetic liquid seal assembly, taking advantage of its high pressure resistance and high reliability, combined with a high pressure pump and a differential valve, the pressure regulating chamber II Form a stable high-pressure air environment.
所述左电控阀门、压差传感器和右电控阀门形成的差动阀的压差控制范围小于由左极靴、永磁体和右极靴形成的磁性液体密封组件的最大耐压值。通过改进后的磁性液体密封装置，其耐压能力有了极大提高，虽然也可以耐低压，但更多的应用是在压力超过3MPa的场合。在这种高压下，一旦调压腔室I或II内的压力因外界原因发生较大波动，造成磁性液体密封组件内的磁性液体被冲破，该装置将完全失效，即使重新调节调压腔室I或II的压力也无法继续使用。因此，为避免产生上述情况，应使得磁性液体密封组件的最大耐压值应大于差动阀的压差控制范围至少1MPa以上，使得压力波动的冲击完全由差动阀承担。The differential pressure control range of the differential valve formed by the left electric control valve, the differential pressure sensor and the right electric control valve is smaller than the maximum withstand pressure value of the magnetic liquid sealing assembly formed by the left pole piece, the permanent magnet and the right pole piece. Through the improved magnetic liquid sealing device, its pressure resistance capacity has been greatly improved. Although it can also withstand low pressure, it is more used in occasions where the pressure exceeds 3MPa. Under such high pressure, once the pressure in the pressure regulating chamber I or II fluctuates greatly due to external reasons, causing the magnetic liquid in the magnetic liquid seal assembly to be broken, the device will completely fail, even if the pressure regulating chamber is readjusted The pressure of I or II cannot continue to be used. Therefore, in order to avoid the above situation, the maximum withstand pressure value of the magnetic liquid seal assembly should be at least 1MPa greater than the differential pressure control range of the differential valve, so that the impact of pressure fluctuations is completely borne by the differential valve.
所述调压腔室I与被密封气体的腔室相连，调压腔室II通过密封组件与外界环境相连，充入的气体为空气、二氧化碳等惰性或廉价气体，调压腔室I的压力大于调压腔室II的压力，其压差值小于磁性液体密封组件的最大耐压值。当调压腔室I的压力在3MPa以上时，为确保安全使用，调压腔室I和II之间的差值应至少要小于磁性液体密封组件的最大耐压值1MPa以上。The pressure regulating chamber I is connected with the sealed gas chamber, and the pressure regulating chamber II is connected with the external environment through a sealing assembly, and the gas filled is inert or cheap gas such as air and carbon dioxide. Greater than the pressure of the pressure regulating chamber II, the pressure difference value is less than the maximum withstand pressure value of the magnetic liquid sealing assembly. When the pressure of the pressure regulating chamber I is above 3MPa, in order to ensure safe use, the difference between the pressure regulating chambers I and II should be at least less than the maximum withstand pressure value of the magnetic liquid sealing assembly above 1MPa.
本发明和已有技术相比所具有的有益效果：(1)该装置可以在不增加轴向长度的情况下，使磁性液体密封装置耐压能力远远大于现有技术所能承受的最大耐压值，突破了现有技术耐压能力的瓶颈；(2)左电控阀门和储气罐有效的在调压腔室I的压力过大时，将昂贵或易燃、易爆、高腐蚀性的气体及时排放并储存，既避免了对人员设备造成的伤害，又节约了成本；(3)密封组件、右电控阀门和高压泵可有效的将空气或其他气体充入调压腔室II内形成稳定的高压，使得磁性液体密封两侧腔室的压差达到许用范围。Compared with the prior art, the present invention has the beneficial effects: (1) The device can make the pressure resistance of the magnetic liquid sealing device far greater than the maximum withstand capacity of the prior art without increasing the axial length; (2) the left electric control valve and the gas storage tank can effectively reduce the pressure of the expensive or flammable, explosive and highly corrosive Timely discharge and storage of permanent gas, which not only avoids damage to personnel and equipment, but also saves costs; (3) Sealing components, right electric control valves and high-pressure pumps can effectively fill air or other gases into the pressure regulating chamber A stable high pressure is formed in II, so that the pressure difference between the chambers on both sides of the magnetic liquid seal reaches the allowable range.
附图说明Description of drawings
图1一种提高磁性液体密封耐压能力的装置。Figure 1 A device for improving the pressure resistance of magnetic liquid seals.
图1中：外壳1、左电控阀门 2、储气罐 3、左极靴 4、永磁体 5、压差传感器 6、右极靴 7、右电控阀门 8、高压泵 9、密封组件 10、挡圈 11、右隔磁环 12、左隔磁环13。In Figure 1: housing 1, left electric control valve 2, gas storage tank 3, left pole shoe 4, permanent magnet 5, differential pressure sensor 6, right pole shoe 7, right electric control valve 8, high pressure pump 9, sealing assembly 10 , retaining ring 11, right spacer magnetic ring 12, left spacer magnetic ring 13.
具体实施方式Detailed ways
以附图为具体实施方式对本发明作进一步说明：The present invention will be further described with accompanying drawing as specific embodiment:
一种提高磁性液体密封耐压能力的装置，如图1，该密封装置包括：外壳1、左电控阀门2、储气罐3、左极靴4、永磁体5、压差传感器6、右极靴7、右电控阀门8、高压泵9、密封组件10、挡圈11、右隔磁环12、左隔磁环13。A device for improving the pressure resistance of magnetic liquid seals, as shown in Figure 1, the sealing device includes: a housing 1, a left electric control valve 2, a gas storage tank 3, a left pole shoe 4, a permanent magnet 5, a differential pressure sensor 6, a right Pole shoe 7, right electric control valve 8, high-pressure pump 9, sealing assembly 10, retaining ring 11, right magnetic isolation ring 12, left magnetic isolation ring 13.
构成该装置的各部分之间的连接：Connections between the parts making up the device:
先将左隔磁环13安装在外壳1内孔的右端面，并确保左隔磁环13的通孔a2与外壳1左侧的通孔a1同轴；然后将左极靴4安装在左隔磁环13的右端面，继将永磁体5安装在左极靴4的右端面，继将右极靴7安装在永磁体5的右端面形成磁性液体密封组件；继将右隔磁12环安装在右极靴7的右端面，并确保右隔磁环12的通孔b2与外壳1右侧的通孔b1同轴；再将密封组件10安装在右隔磁环12的右端面，通过挡圈11与外壳1的固定连接将外壳1内的零件轴向定位。将压差传感器6、左电控阀2和右电控阀8所形成的差动阀与外壳1固定连接，其中差动阀气口a与外壳1左侧的通孔a1同轴，差动阀气口b与外壳1右侧的通孔b1同轴，差动阀气口d与储气罐3相连，差动阀气口c与高压泵9相连。First install the left magnetic spacer ring 13 on the right end face of the inner hole of the shell 1, and ensure that the through hole a2 of the left magnetic spacer ring 13 is coaxial with the through hole a1 on the left side of the shell 1; then install the left pole piece 4 on the left spacer On the right end face of the magnetic ring 13, the permanent magnet 5 is installed on the right end face of the left pole shoe 4, and the right pole shoe 7 is installed on the right end face of the permanent magnet 5 to form a magnetic liquid seal assembly; On the right end face of the right pole piece 7, and ensure that the through hole b2 of the right magnetic isolation ring 12 is coaxial with the through hole b1 on the right side of the housing 1; then install the seal assembly 10 on the right end face of the right magnetic isolation ring 12, The fixed connection of the ring 11 to the housing 1 axially positions the components inside the housing 1 . The differential valve formed by the differential pressure sensor 6, the left electric control valve 2 and the right electric control valve 8 is fixedly connected to the casing 1, wherein the differential valve gas port a is coaxial with the through hole a1 on the left side of the casing 1, and the differential valve The air port b is coaxial with the through hole b1 on the right side of the housing 1 , the differential valve air port d is connected to the air storage tank 3 , and the differential valve air port c is connected to the high pressure pump 9 .
在工作时，先向调压腔室I内缓慢充入被密封气体，当调压腔室I和调压腔室II的压差达到选定控制范围后，将泵打开，向调压腔室II内充入调压气体(空气或二氧化碳等)，通过缓慢增加泵的功率确保调压腔室I和调压腔室II的压差始终保持在控制范围内，直到调压腔室I内的气体压强达到要求值后，保持泵的功率稳定，最后通过差动阀来调控调压腔室I和调压腔室II内的压差。When working, first slowly fill the sealed gas into the pressure regulating chamber I, and when the pressure difference between the pressure regulating chamber I and the pressure regulating chamber II reaches the selected control range, turn on the pump, Fill pressure regulating gas (air or carbon dioxide, etc.) into II, and ensure that the pressure difference between pressure regulating chamber I and After the gas pressure reaches the required value, keep the power of the pump stable, and finally adjust the pressure difference between the pressure regulating chamber I and the pressure regulating chamber II through the differential valve.
左、右隔磁环、外壳1均选用非导磁性物质。Both the left and right spacer rings and the shell 1 are made of non-magnetic materials.
左、右极靴选用导磁性物质。The left and right pole pieces are made of magnetically permeable material.
Claims (6)
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| CN112112971B (en) * | 2020-10-30 | 2022-02-11 | 清华大学 | Floating Ring Magnetic Liquid Sealing Device |
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