Dual magnetic source magnetofluidic seal device and cooling control system and method

Abstract

The application provides a double-magnetic-source magnetic fluid sealing device and a cooling control system and method, which comprises a shell, the inside of the shell is rotationally installed with a rotating shaft through a bearing, the rotating shaft is installed with an inner pole shoe, a permanent magnet sleeve and an inner permanent magnet, the bearing is axially limited through the sleeve with the inner pole shoe; the inside of the shell is installed with an outer pole shoe and an outer permanent magnet through radial positioning; the shell is provided with a water inlet, the water inlet is connected with a cooling water channel in the inside of the shell, the outlet of the cooling water channel is connected with a water outlet; the shell is provided with a plurality of magnetic fluid supplementing openings for supplementing magnetic fluid, the magnetic fluid supplementing openings are communicated with tooth and groove holes on the pole shoes; the magnetic fluid supplementing openings simultaneously serve as temperature measuring openings for temperature measurement. By increasing the inner pole shoe and the inner permanent magnet on the shaft, the magnetic gathering performance of the pole shoe is greatly enhanced, the magnetic leakage of the device is reduced, the magnetic motive force of the magnetic circuit is enhanced, the magnetic induction intensity of the sealing gap is improved, and the pressure resistance of the device is increased.

Description

Technical Field

[0001] This invention relates to the field of mechanical engineering sealing technology, specifically to a dual-magnetic-source magnetofluid sealing device and its cooling control system and method. Background Technology

[0002] Magnetofluidic seals mainly consist of a permanent magnet, a magnetofluid, magnetic pole shoes, and a shaft (sleeve). They primarily utilize the response characteristics of magnetofluid to magnetic fields. Under the influence of the magnetic field generated by the permanent magnet, the magnetofluid placed between the shaft and the top of the pole shoe is concentrated, forming a so-called liquid "O" ring that completely seals the gap, thus achieving a seal. Compared to traditional mechanical seals, magnetofluidic seals offer advantages such as zero leakage, low wear, long lifespan, and self-healing, and are widely used in aerospace, electronics, chemical, energy, machinery, and medical fields. However, compared to traditional seals like mechanical seals, magnetofluidic seals have relatively lower pressure over the same axial distance, which significantly limits their application. Therefore, this invention designs a dual-magnetic-source magnetofluidic seal device. By adding an inner pole shoe and an inner permanent magnet to the shaft, the magnetic focusing performance of the pole shoe is greatly enhanced, magnetic leakage is reduced, and the magnetomotive force of the magnetic circuit is strengthened, thereby increasing the magnetic induction intensity of the sealing gap and improving the pressure resistance of the device. In addition, a matching cooling control system was designed. When the temperature of the sealing gap rises too high due to the high speed of the rotating shaft, the device can be cooled to prevent the sealing performance from deteriorating due to the high speed of the rotating shaft, thereby improving the operational reliability of the magnetic fluid sealing device. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing magnetohydrodynamic (MHD) sealing technologies, such as insufficient pressure resistance and inadequate sealing reliability under high-speed conditions. A cooling control system for a dual-magnetic-source MHD sealing device is proposed. By adding inner pole shoes and inner permanent magnets to the shaft, the magnetic focusing performance of the pole shoes is greatly enhanced, magnetic leakage is reduced, and the magnetomotive force of the magnetic circuit is strengthened, thereby increasing the magnetic induction intensity of the sealing gap and improving the pressure resistance of the device. A matching cooling control system is also designed to cool the entire sealing device. A spiral water channel is designed on the outer shell to wrap around and cover the entire heat-generating part of the device, improving cooling efficiency and preventing the sealing performance from deteriorating due to excessively high sealing gap temperature caused by excessive shaft rotation speed, thus improving the operational reliability of the MHD sealing device.

[0004] To achieve the above-mentioned technical features, the present invention aims to provide a dual-magnetic-source magnetohydrodynamic sealing device, comprising a housing, a rotating shaft rotatably mounted inside the housing via a bearing, an inner pole shoe, a permanent magnet sleeve, and an inner permanent magnet mounted on the rotating shaft, with the bearing and the inner pole shoe being axially limited by the sleeve; and an outer pole shoe and an outer permanent magnet being radially positioned inside the housing.

[0005] The outer casing is equipped with a water inlet, which is connected to the cooling water circuit inside the casing, and the outlet of the cooling water circuit is connected to the water outlet.

[0006] The outer casing is provided with multiple magnetofluid replenishment ports for replenishing magnetofluid, and the magnetofluid replenishment ports are connected to the toothed slot holes on the pole shoes; the magnetofluid replenishment ports also serve as temperature measuring ports.

[0007] One end of the bearing is positioned by a shoulder on the shaft, while the other end of the bearing is positioned by a fixed base fixed to the end of the housing. The fixed base is fixed to the housing by locking screws, so that the parts do not move axially inside the housing.

[0008] The inner and outer permanent magnets are provided with permanent magnet sleeves, which are made of non-magnetic materials.

[0009] The inner pole shoe is made of magnetically conductive material.

[0010] The cooling water circuit adopts a spiral water circuit.

[0011] A cooling control system for a dual-magnetic-source magnetofluid sealing device is disclosed. The cooling control system is used to cool the dual-magnetic-source magnetofluid sealing device. The cooling control system includes the dual-magnetic-source magnetofluid sealing device. The water inlet of the dual-magnetic-source magnetofluid sealing device is connected to a cooling water tank for water supply via a solenoid valve. The water outlet is connected to a cooling water collection tank via a one-way valve. A temperature sensor for temperature monitoring is installed at the location of the magnetofluid replenishment port. The temperature sensor is connected to a data acquisition unit. The data acquisition unit is connected to the control system. The output terminal of the control system is connected to the solenoid valve and controls the supply of cooling water.

[0012] The temperature sensor is connected to the magnetofluid supply port via a threaded structure.

[0013] The control method includes the following steps:

[0014] The dual-magnetic-source magnetofluid sealing device is connected to a temperature sensor via a threaded connection. The temperature sensor collects temperature information from the sealing gap of the dual-magnetic-source magnetofluid sealing device and transmits it to the control system via a data acquisition device. The control system controls a solenoid valve to connect the cooling water tank to the inlet of the dual-magnetic-source magnetofluid sealing device based on the collected temperature information. Cooling water flows in from the inlet and flows out from the outlet of the dual-magnetic-source magnetofluid sealing device. A one-way valve is connected to the outlet, and the tail end of the one-way valve is connected to a cooling water collection tank to collect the cooling water.

[0015] A control method for the cooling control system of a dual-magnetic-source magnetohydrodynamic sealing device, wherein the specific control process is as follows:

[0016] a. When the control system determines that the temperature of the magnetic fluid sealing gap is too high based on the temperature information collected by the temperature sensor installed on the outer shell, it controls the solenoid valve to open, so that the cooling water in the cooling water tank flows into the cooling water pipe from the cooling water inlet on the outer shell, thereby realizing the cooling of the dual magnetic source magnetic fluid sealing device.

[0017] b. The cooling water outlet is connected to a one-way valve, which allows the cooling water to flow only from the inlet to the outlet of the outer casing. When the solenoid valve is not open, other substances cannot enter the cooling water circuit of the dual magnetic source magnetofluid sealing device through the outlet.

[0018] The present invention has the following beneficial effects:

[0019] 1. By adding an inner pole shoe and an inner permanent magnet to the shaft, this invention greatly enhances the magnetic focusing performance of the pole shoe, reduces magnetic leakage, and strengthens the magnetomotive force of the magnetic circuit, thereby increasing the magnetic induction intensity of the sealing gap within a limited axial space and improving the pressure resistance of the device.

[0020] 2. The present invention has designed a matching cooling control system. When the temperature of the sealing gap rises too high due to the high speed of the rotating shaft, the device can be cooled to prevent the sealing performance from decreasing due to the high speed of the rotating shaft, thereby improving the operational reliability of the magnetic fluid sealing device. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a diagram of the cooling control system of the dual magnetic source magnetohydrodynamic sealing device of the present invention.

[0023] Figure 2 This is a front sectional view of the dual magnetic source magnetofluid sealing device of the present invention.

[0024] Figure 3 This is a three-dimensional exploded view of the dual-magnetic-source magnetofluid sealing device of the present invention.

[0025] In the figure: 1. Dual magnetic source magnetohydrodynamic sealing device, 2. Solenoid valve, 3. Temperature sensor, 4. Data acquisition device, 5. Control system, 6. Check valve, 7. Cooling water collection tank, 8. Cooling water tank;

[0026] Fixed base 101, outer shell 102, water inlet 103, cooling water channel 104, magnetofluid replenishment port 105, water outlet 106, bearing 107, rotating shaft 108, outer pole shoe 109, inner pole shoe 110, outer permanent magnet 111, permanent magnet sleeve 112, inner permanent magnet 113, locking screw 114, sleeve 115. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above-described invention are still within the scope of protection of the present invention.

[0028] Example 1:

[0029] A dual-magnetic-source magnetofluid sealing device is characterized in that the dual-magnetic-source magnetofluid sealing device 1 includes a housing 102, inside which a rotating shaft 8 is rotatably mounted via a bearing 107, and an inner pole shoe 110, a permanent magnet sleeve 112, and an inner permanent magnet 113 are mounted on the rotating shaft 8, with the bearing 107 and the inner pole shoe 110 being axially limited by a sleeve 115; an outer pole shoe 109 and an outer permanent magnet 111 are radially positioned inside the housing 102; a water inlet 103 is provided on the housing 102, which is connected to a cooling water passage 104 inside the housing 102, and the outlet of the cooling water passage 104 is connected to an outlet 106; a plurality of magnetofluid replenishment ports 105 for replenishing magnetofluid are provided on the housing 102, and the magnetofluid replenishment ports 105 are connected to the toothed groove holes on the pole shoes; the magnetofluid replenishment ports 105 also serve as temperature measuring ports. By adding inner pole shoes and inner permanent magnets to the shaft, the magnetic focusing performance of the pole shoes is greatly enhanced, the leakage magnetic field of the device is reduced, and the magnetomotive force of the magnetic circuit is enhanced, thereby improving the magnetic induction intensity of the sealing gap and increasing the pressure resistance of the device.

[0030] Furthermore, one end of the bearing 107 is positioned by a shoulder on the rotating shaft 8, while the other end of the bearing 107 is positioned by a fixing base 101 fixed to the end of the housing 102. The fixing base 101 is fixed to the housing 102 by locking screws 114, thereby preventing axial movement of the components inside the housing. The above-described installation structure ensures smooth rotation of the rotating shaft 8.

[0031] Furthermore, a permanent magnet sleeve 112 is provided on both the inner permanent magnet 113 and the outer permanent magnet 111. The permanent magnet sleeve 112 is made of a non-magnetic material. During actual rotation of the shaft, this prevents the magnetic fluid below the permanent magnet from being attracted to it, thus avoiding inconvenience in cleaning during installation and disassembly. Additionally, it prevents insufficient magnetic fluid volume in the sealing gap due to the magnetic fluid being attracted to the permanent magnet, which would affect the sealing performance.

[0032] Furthermore, the inner pole shoe 110 is made of a magnetically conductive material. By adding the inner pole shoe 110 and the inner permanent magnet 113, compared to the traditional magnetohydrodynamic sealing device which only uses the outer pole shoe, the outer permanent magnet, and the rotating shaft to form a magnetic circuit for sealing, the magnetic focusing performance of the pole shoe is greatly enhanced, the magnetic leakage of the device is reduced, the magnetomotive force of the magnetic circuit is enhanced, thereby increasing the magnetic induction intensity of the sealing gap and improving the pressure resistance of the device.

[0033] Furthermore, the cooling water channel 104 adopts a spiral water channel. The spiral water channel covers a wider area of ​​the heat-generating part of the device, resulting in better cooling efficiency and a superior cooling effect.

[0034] Example 2:

[0035] This embodiment provides a cooling control system for a dual-magnetic-source magnetofluid sealing device. The cooling control system is used to cool the dual-magnetic-source magnetofluid sealing device. The cooling control system includes a dual-magnetic-source magnetofluid sealing device 1. The water inlet 103 of the dual-magnetic-source magnetofluid sealing device 1 is connected to a cooling water tank 8 for water supply through a solenoid valve 2. The water outlet 106 is connected to a cooling water collection tank 7 through a one-way valve 6. A temperature sensor 3 for temperature monitoring is installed at the location of the magnetofluid replenishment port 105. The temperature sensor 3 is connected to a data acquisition unit 4. The data acquisition unit 4 is connected to a control system 5. The output terminal of the control system 5 is connected to the solenoid valve 2 and controls the supply of cooling water. Through the aforementioned cooling control system, the temperature sensor collects temperature information from the sealing gap of the dual-magnetic-source magnetofluidic sealing device and transmits it to the control system via a data acquisition device. Based on this temperature information, the control system controls a solenoid valve to connect the cooling water tank to the inlet of the dual-magnetic-source magnetofluidic sealing device. Cooling water flows in from the spiral water inlet and out from the outlet of the dual-magnetic-source magnetofluidic sealing device, cooling the device and preventing a decrease in sealing performance due to excessively high sealing gap temperature caused by excessive shaft speed. This improves the operational reliability of the magnetofluidic sealing device. A one-way valve is connected to the spiral water outlet, with its tail end connected to the cooling water collection tank. This ensures that cooling water can only flow from the inlet to the outlet of the outer casing. When the solenoid valve is not open, other substances cannot enter the cooling pipes of the magnetofluidic sealing device through the outlet.

[0036] Furthermore, the temperature sensor 3 is connected to the magnetofluid supply port 105 via a threaded structure. The opening and closing of the solenoid valve can be controlled by the temperature information collected by the temperature sensor 3.

[0037] Example 3:

[0038] A control method for a cooling control system of a dual-magnetic-source magnetohydrodynamic sealing device, the control method comprising the following steps:

[0039] The dual-magnetic-source magnetic fluid sealing device 1 is connected to the temperature sensor 3 via a threaded connection. The temperature sensor 3 transmits the temperature information collected in the sealing gap of the dual-magnetic-source magnetic fluid sealing device 1 to the control system 5 through the data acquisition device 4. The control system 5 controls the solenoid valve 2 to connect the cooling water tank 8 to the inlet 103 of the dual-magnetic-source magnetic fluid sealing device 1 based on the collected temperature information. Cooling water flows in from the inlet 103 and flows out from the outlet 106 of the dual-magnetic-source magnetic fluid sealing device 1. The outlet 106 is connected to a one-way valve 6. The tail end of the one-way valve 6 is connected to the cooling water collection tank 7 to collect the cooling water.

[0040] Example 4:

[0041] A control method for the cooling control system of a dual-magnetic-source magnetohydrodynamic sealing device, wherein the specific control process is as follows:

[0042] a. When the control system 5 determines that the temperature of the magnetic fluid sealing gap is too high based on the temperature information collected by the temperature sensor 3 installed on the housing 102, it controls the solenoid valve 2 to open, so that the cooling water in the cooling water tank 7 flows into the cooling water pipe 104 from the cooling water inlet 103 on the housing 102, thereby realizing the cooling of the dual magnetic source magnetic fluid sealing device 1.

[0043] b. A one-way valve 6 is connected to the cooling water outlet 106, which allows the cooling water to flow only from the inlet to the outlet of the housing 102. When the solenoid valve 2 is not opened, other substances cannot enter the cooling water circuit 4 of the dual magnetic source magnetofluid sealing device 1 through the outlet 106.

[0044] The working mechanism and advantages of this invention:

[0045] a. Traditional magnetic fluid sealing devices only have an outer pole shoe, an outer permanent magnet, and a rotating shaft to form a magnetic circuit to achieve sealing. The dual magnetic source magnetic fluid sealing device of the present invention adds an inner pole shoe 110 with good magnetic permeability on the shaft. The pole shoe has better magnetic focusing performance, which makes the entire device have less magnetic leakage and a greater magnetic induction intensity in the sealing gap, thereby making the device have a greater sealing pressure.

[0046] b. The dual magnetic source magnetohydrodynamic sealing device of the present invention adds an inner permanent magnet 113 on the shaft to enhance the magnetomotive force, so that the magnetic induction intensity of the sealing gap can be increased more in the limited axial space, thereby the device can have a greater sealing pressure.

[0047] c. The housing 102 of the dual magnetic source magnetofluid sealing device of the present invention is designed with a spiral water channel that wraps around and covers the entire heat-generating part of the device, which has better cooling efficiency and increases the reliability of sealing under high-speed operation.

[0048] d. The housing 102 of the dual-magnetic-source magnetofluid sealing device of the present invention is designed with a magnetofluid replenishment port 105, which communicates with the toothed groove hole on the pole shoe. When the magnetofluid in the sealing gap is insufficient, it can be replenished through this port. When it is not necessary to replenish the magnetofluid, a temperature sensor can be connected to monitor the temperature in the sealing gap.

[0049] e. The dual-magnetic-source magnetofluid sealing device of the present invention is designed with non-magnetic sleeves 112 on the inner and outer permanent magnets. During the rotation of the shaft, this prevents the magnetic fluid below the permanent magnet from being attracted to the permanent magnet, avoiding the inconvenience of cleaning during installation and disassembly. It also prevents insufficient volume of magnetofluid in the sealing gap due to the magnetofluid being attracted to the permanent magnet during the sealing process, thus affecting the sealing performance.

[0050] The above are embodiments of the present invention. The above embodiments and specific parameters are only for clearly illustrating the invention verification process and are not intended to limit the patent protection scope of the present invention. The patent protection scope of the present invention shall still be determined by its claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention should also be included within the protection scope of the present invention.

Claims

1. A cooling control system for a dual-magnetic-source magnetohydrodynamic sealing device, characterized in that, The dual-magnetic-source magnetohydrodynamic sealing device (1) includes a housing (102). Inside the housing (102), a rotating shaft (108) is rotatably mounted via a bearing (107). An inner pole shoe (110), a permanent magnet sleeve (112), and an inner permanent magnet (113) are mounted on the rotating shaft (108). The bearing (107) and the inner pole shoe (110) are axially limited by a sleeve (115). Inside the housing (102), an outer pole shoe (109) and an outer permanent magnet (111) are radially positioned. The outer casing (102) is provided with a water inlet (103), which is connected to the cooling water passage (104) inside the outer casing (102), and the outlet of the cooling water passage (104) is connected to the water outlet (106). The outer shell (102) is provided with a plurality of magnetic fluid replenishment ports (105) for replenishing magnetic fluid, and the magnetic fluid replenishment ports (105) are connected to the toothed groove holes on the pole shoe; the magnetic fluid replenishment ports (105) also serve as temperature measuring ports; One end of the bearing (107) is positioned by the shoulder on the rotating shaft (108), and the other end of the bearing (107) is positioned by the fixed base (101) fixed to the end of the housing (102). The fixed base (101) is fixed to the housing (102) by the locking screw (114), so that the parts do not move axially inside the housing. The cooling control system includes a dual magnetic source magnetic fluid sealing device (1). The inlet (103) of the dual magnetic source magnetic fluid sealing device (1) is connected to the cooling water tank (8) for water supply through a solenoid valve (2). The outlet (106) is connected to the cooling water collection tank (7) through a one-way valve (6). A temperature sensor (3) for temperature monitoring is installed at the location of the magnetic fluid replenishment port (105). The temperature sensor (3) is connected to the data acquisition unit (4). The data acquisition unit (4) is connected to the control system (5). The output terminal of the control system (5) is connected to the solenoid valve (2) and controls the supply of cooling water.

2. The cooling control system of the dual-magnetic-source magnetohydrodynamic sealing device according to claim 1, characterized in that, The inner permanent magnet (113) and the outer permanent magnet (111) are provided with permanent magnet sleeves (112), and the permanent magnet sleeves (112) are made of non-magnetic materials.

3. The cooling control system of the dual-magnetic-source magnetohydrodynamic sealing device according to claim 1, characterized in that, The inner pole shoe (110) is made of magnetic material.

4. The cooling control system of the dual-magnetic-source magnetohydrodynamic sealing device according to claim 1, characterized in that, The cooling water circuit (104) adopts a spiral water circuit.

5. The cooling control system of the dual-magnetic-source magnetohydrodynamic sealing device according to claim 1, characterized in that, The temperature sensor (3) is connected to the magnetofluid supply port (105) via a threaded structure.

6. A control method for the cooling control system of a dual-magnetic-source magnetohydrodynamic sealing device according to any one of claims 1-5, characterized in that, The control method includes the following steps: The dual magnetic source magnetic fluid sealing device (1) is connected to the temperature sensor (3) via a threaded connection. The temperature sensor (3) transmits the temperature information collected in the sealing gap of the dual magnetic source magnetic fluid sealing device (1) to the control system (5) via the data acquisition device (4). The control system (5) controls the solenoid valve (2) to connect the cooling water tank (8) to the inlet (103) of the dual magnetic source magnetic fluid sealing device (1) according to the collected temperature information. Cooling water flows in from the inlet (103) and flows out from the outlet (106) of the dual magnetic source magnetic fluid sealing device (1). The outlet (106) is connected to a one-way valve (6). The tail end of the one-way valve (6) is connected to the cooling water collection tank (7) to collect the cooling water.

7. The control method for the cooling control system of the dual-magnetic-source magnetohydrodynamic sealing device according to claim 6, characterized in that, In the specific control process: a. When the control system (5) determines that the temperature of the magnetic fluid sealing gap is too high based on the temperature information collected by the temperature sensor (3) installed on the outer shell (102), it controls the solenoid valve (2) to open, so that the cooling water in the cooling water tank (8) flows into the cooling water path (104) from the cooling water inlet (103) on the outer shell (102), thereby realizing the cooling of the dual magnetic source magnetic fluid sealing device (1); b. The cooling water outlet (106) is connected to a one-way valve (6), which allows the cooling water to flow only from the inlet of the outer shell (102) to the outlet. When the solenoid valve (2) is not opened, other substances cannot enter the cooling water circuit (104) of the dual magnetic source magnetofluid sealing device (1) through the outlet (106).

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