Double-magnetic-source magnetofluid sealing device and cooling control system and method

Abstract

The invention provides a double-magnetic-source magnetofluid sealing device and a cooling control system and method.The double-magnetic-source magnetofluid sealing device comprises a shell, a rotating shaft is rotationally installed in the shell through a bearing, an inner pole shoe, a permanent magnet sleeve and an inner permanent magnet are installed on the rotating shaft, and the bearing and the inner pole shoe are axially limited through the sleeve; an outer pole shoe and an outer permanent magnet are mounted in the shell through radial positioning; the shell is provided with a water inlet, the water inlet is communicated with a cooling water path in the shell, and an outlet of the cooling water path is connected with the water outlet; the shell is provided with a plurality of magnetofluid supplementing ports used for supplementing magnetofluid, and the magnetofluid supplementing ports are communicated with the tooth groove holes in the pole shoes. And the magnetic fluid supplementing port is also used as a temperature measuring port for measuring temperature. By additionally arranging the inner pole shoes and the inner permanent magnets on the shaft, the magnetic gathering performance of the pole shoes is greatly enhanced, the magnetic leakage of the device is reduced, and the magnetomotive force of a magnetic loop is enhanced, so that the magnetic induction intensity of a sealing gap is improved, and the pressure resistance of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical engineering sealing, and in particular to a dual-magnetic source magnetic fluid sealing device and a cooling control system and method. Background Art

[0002] The magnetic fluid seal is mainly composed of a permanent magnet, a magnetic fluid, a magnetic pole shoe and a shaft (sleeve). The magnetic fluid is mainly used to respond to the magnetic field. Under the action of the magnetic field generated by the permanent magnet, the magnetic fluid placed between the gap between the shaft and the top of the pole shoe is concentrated to form a so-called liquid "O" ring, which completely blocks the sealing gap, thereby achieving the purpose of sealing. Compared with traditional mechanical seals, magnetic fluid seals have the advantages of zero leakage, low wear, long life and self-repair, and are widely used in aviation, aerospace, electronics, chemical industry, energy, machinery, medical and other fields. However, compared with traditional seals such as mechanical seals, the pressure of magnetic fluid seals is relatively low within the same axial distance, which greatly limits its application and promotion. Therefore, the present invention designs a dual-magnetic source magnetic fluid sealing device, which greatly enhances the magnetic field performance of the pole shoe by adding an inner pole shoe and an inner permanent magnet to the shaft, reduces the magnetic leakage of the device, and enhances the magnetomotive force of the magnetic circuit, thereby improving the magnetic induction intensity of the sealing gap and increasing the pressure resistance of the device. In addition, a matching cooling control system is designed. When the temperature of the sealing gap rises too high due to high-speed operation of the shaft, the device can be cooled to prevent the sealing performance from being reduced due to excessive shaft speed, thereby improving the operating reliability of the magnetic fluid sealing device. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the existing magnetic fluid sealing technology, such as insufficient pressure resistance and insufficient reliability of sealing performance under high-speed conditions, and to propose a cooling control system for a dual-magnetic source magnetic fluid sealing device. By adding an inner pole shoe and an inner permanent magnet to the shaft, the magnetic field collecting performance of the pole shoe is greatly enhanced, the magnetic leakage 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. In addition, a matching cooling control system is designed to cool the entire sealing device. A spiral water channel is designed on the outer casing to wrap around and cover the heating part of the entire device, which improves the cooling efficiency, prevents the sealing performance from decreasing due to excessive temperature of the sealing gap caused by excessive shaft speed, and improves the operating reliability of the magnetic fluid sealing device.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: a dual-magnetic source magnetic fluid sealing device, the dual-magnetic source magnetic fluid sealing device comprises a shell, a rotating shaft is rotatably installed inside the shell through a bearing, an inner pole shoe, a permanent magnet sleeve and an inner permanent magnet are installed on the rotating shaft, and the bearing and the inner pole shoe are axially limited by a sleeve; an outer pole shoe and an outer permanent magnet are installed inside the shell through radial positioning; The shell is provided with a water inlet, the water inlet is connected to a cooling water circuit inside the shell, and the outlet of the cooling water circuit is connected to the water outlet; The shell is provided with a plurality of magnetic fluid replenishing ports for replenishing the magnetic fluid, and the magnetic fluid replenishing ports are communicated with the tooth slot holes on the pole shoe; the magnetic fluid replenishing ports also serve as temperature measuring ports for measuring temperature.

[0005] The bearing at one end is positioned by a shoulder on the rotating shaft, and the bearing at the other end is positioned by a fixed base fixed to the end of the housing. The fixed base is fixed to the housing by a locking screw, so that the parts do not move axially inside the housing.

[0006] The inner permanent magnet and the outer permanent magnet are provided with permanent magnet sleeves, and the permanent magnet sleeves are made of non-magnetic conductive material.

[0007] The inner pole shoe is made of magnetic conductive material.

[0008] The cooling water channel adopts a spiral water channel.

[0009] A cooling control system for a dual-magnetic source magnetic fluid sealing device, the cooling control system is used to cool the dual-magnetic source magnetic fluid sealing device, the cooling control system includes a dual-magnetic source magnetic fluid sealing device, the water inlet of the dual-magnetic source magnetic fluid sealing device is connected to a cooling water tank for water supply through a solenoid valve, the water outlet is connected to a cooling water collection tank through a one-way valve, a temperature sensor for temperature monitoring is installed at the location of the magnetic fluid replenishment port, the temperature sensor is connected to a data collector, the data collector is connected to a control system, and the model output end of the control system is connected to the solenoid valve and controls the supply of cooling water.

[0010] The temperature sensor is connected to the magnetic fluid replenishment port through a threaded structure.

[0011] The control method comprises the following steps: The dual-magnetic source magnetic fluid sealing device is connected to the temperature sensor through a threaded connection. The temperature sensor transmits the collected temperature information in the sealing gap of the dual-magnetic source magnetic fluid sealing device to the control system through a data acquisition device. The control system controls the solenoid valve to connect the cooling water tank with the water inlet of the dual-magnetic source magnetic fluid sealing device according to the collected temperature information. The cooling water flows in from the water inlet and flows out from the water outlet of the dual-magnetic source magnetic fluid sealing device. The water outlet is connected to a one-way valve, and the tail end of the one-way valve is connected to the cooling water collection tank to collect the cooling water.

[0012] A control method for a cooling control system of a dual-magnetic source magnetic fluid sealing device, in which: a. When the control system determines that the temperature of the magnetic fluid sealing gap is too high based on the temperature information in the magnetic fluid sealing gap collected by the temperature sensor installed on the shell, the solenoid valve is controlled to open, so that the cooling water in the cooling water tank flows into the cooling water pipeline from the cooling water inlet on the shell, thereby realizing the cooling of the dual magnetic source magnetic fluid sealing device; b. The cooling water outlet is connected with a one-way valve, which can make the cooling water flow only from the water inlet to the outlet of the shell. When the solenoid valve is not opened, other substances cannot enter the cooling water path of the dual magnetic source magnetic fluid sealing device through the outlet.

[0013] The present invention has the following beneficial effects: 1. Since the present invention adds an inner pole shoe and an inner permanent magnet on the shaft, compared with the traditional magnetic fluid sealing device which is only designed with an outer pole shoe, an outer permanent magnet and a rotating shaft to form a magnetic circuit to achieve sealing, the magnetic field concentration performance of the pole shoe is greatly enhanced, the magnetic leakage 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 within a limited axial space and improving the pressure resistance of the device.

[0014] 2. The present invention is designed with a matching cooling control system. When the temperature of the sealing gap rises too high due to high-speed operation of the rotating shaft, the device can be cooled to prevent the sealing performance from being reduced due to the high rotating shaft speed, thereby improving the operating reliability of the magnetic fluid sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 This is a diagram of the cooling control system of the dual magnetic source magnetic fluid sealing device of the present invention.

[0017] Figure 2 It is a main cross-sectional view of the dual magnetic source magnetic fluid sealing device of the present invention.

[0018] Figure 3 It is a three-dimensional exploded structural diagram of the dual magnetic source magnetic fluid sealing device of the present invention.

[0019] In the figure: dual magnetic source magnetic fluid sealing device 1, solenoid valve 2, temperature sensor 3, data acquisition device 4, control system 5, one-way valve 6, cooling water collection tank 7, cooling water tank 8; Fixed base 101, housing 102, water inlet 103, cooling water channel 104, magnetic fluid replenishing 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 DESCRIPTION

[0020] The present invention is further described below in conjunction with embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technical personnel in the field based on the above invention content still fall within the scope of protection of the present invention.

[0021] Embodiment 1: A dual-magnetic source magnetic fluid sealing device, characterized in that the dual-magnetic source magnetic fluid sealing device 1 includes a shell 102, a rotating shaft 8 is rotatably installed inside the shell 102 through a bearing 107, an inner pole shoe 110, a permanent magnet sleeve 112 and an inner permanent magnet 113 are installed on the rotating shaft 8, and the bearing 107 and the inner pole shoe 110 are axially limited by a sleeve 115; an outer pole shoe 109 and an outer permanent magnet 111 are installed inside the shell 102 through radial positioning; a water inlet 103 is provided on the shell 102, the water inlet 103 is connected to a cooling water circuit 104 inside the shell 102, and the outlet of the cooling water circuit 104 is connected to a water outlet 106; a plurality of magnetic fluid replenishing ports 105 for replenishing magnetic fluid are provided on the shell 102, and the magnetic fluid replenishing port 105 is communicated with the tooth slot hole on the pole shoe; the magnetic fluid replenishing port 105 also serves as a temperature measuring port for temperature measurement. By adding inner pole shoes and inner permanent magnets to the shaft, the magnetic field collecting performance of the pole shoes is greatly enhanced, the magnetic leakage 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.

[0022] Furthermore, the bearing 107 at one end is positioned by the shoulder on the rotating shaft 8, and the bearing 107 at the other end is positioned by the fixed base 101 fixed to the end of the housing 102, and the fixed base 101 is fixed to the housing 102 by the locking screw 114, so that the parts do not have axial movement inside the housing. The above-mentioned installation structure ensures the smooth rotation of the rotating shaft 8.

[0023] Furthermore, a permanent magnet sleeve 112 is provided on the inner permanent magnet 113 and the outer permanent magnet 111, and the permanent magnet sleeve 112 is made of a non-magnetic material. During the actual rotation of the rotating shaft, the magnetic fluid under the permanent magnet can be prevented from being attracted to the permanent magnet, which makes it inconvenient to clean during installation and disassembly. In addition, it can prevent the magnetic fluid from being attracted to the permanent magnet, resulting in insufficient volume of the magnetic fluid in the sealing gap, thereby affecting the sealing performance.

[0024] 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 with the traditional magnetic fluid sealing device which is only designed with an outer pole shoe, an outer permanent magnet, and a rotating shaft to form a magnetic circuit to achieve sealing, the magnetic collecting performance of the pole shoe is greatly enhanced, the magnetic leakage 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 improving the pressure resistance performance of the device.

[0025] Furthermore, the cooling water channel 104 is a spiral water channel. The spiral water channel covers a wider heating part of the device, the water channel cooling efficiency is better, and a better cooling effect is achieved.

[0026] Embodiment 2: The present embodiment provides a cooling control system for a dual-magnetic source magnetic fluid sealing device, wherein the cooling control system is used to cool the dual-magnetic source magnetic fluid sealing device, and the cooling control system comprises a dual-magnetic source magnetic fluid sealing device 1, wherein the water inlet 103 of the dual-magnetic source magnetic fluid sealing device 1 is connected to a cooling water tank 8 for water supply through a solenoid valve 2, and the water outlet 106 is connected to a cooling water collection tank 7 through a one-way valve 6, and a temperature sensor 3 for temperature monitoring is installed at the location of the magnetic fluid replenishment port 105, and the temperature sensor 3 is connected to a data collector 4, and the data collector 4 is connected to a control system 5, and the model output end of the control system 5 is connected to the solenoid valve 2 and controls the supply of cooling water. Through the above-mentioned cooling control system, the temperature sensor transmits the collected temperature information in the sealing gap of the dual-magnetic source magnetic fluid sealing device to the control system through the data acquisition device. The control system controls the solenoid valve to connect the cooling water tank with the water inlet of the dual-magnetic source magnetic fluid sealing device according to the collected temperature information. The cooling water flows in from the spiral waterway water inlet and flows out from the water outlet of the dual-magnetic source magnetic fluid sealing device to cool the device, thereby preventing the sealing performance from being reduced due to the excessive temperature of the sealing gap caused by the excessive shaft speed, thereby improving the operating reliability of the magnetic fluid sealing device. The spiral waterway outlet is connected to a one-way valve, and the tail end of the one-way valve is connected to the cooling water collection tank, so that the cooling water can only flow from the water inlet of the shell to the water outlet. When the solenoid valve is not opened, other substances cannot enter the cooling pipeline of the magnetic fluid sealing device through the water outlet.

[0027] Furthermore, the temperature sensor 3 is connected to the magnetic fluid supply port 105 through a threaded structure. The temperature information collected by the temperature sensor 3 can be used to control the opening and closing of the electromagnetic valve.

[0028] Embodiment 3: A control method for a cooling control system of a dual-magnetic source magnetic fluid sealing device, the control method comprising the following steps: The dual-magnetic source magnetic fluid sealing device 1 is connected to the temperature sensor 3 through a threaded connection. The temperature sensor 3 transmits the collected temperature information 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 with the water inlet 103 of the dual-magnetic source magnetic fluid sealing device 1 according to the collected temperature information. The cooling water flows in from the water inlet 103 and flows out from the water outlet 106 of the dual-magnetic source magnetic fluid sealing device 1. The water 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.

[0029] Embodiment 4: A control method for a cooling control system of a dual-magnetic source magnetic fluid sealing device, in which: a. When the control system 5 determines that the temperature of the magnetic fluid sealing gap is too high based on the temperature information in the magnetic fluid sealing gap collected by the temperature sensor 3 installed on the housing 102, the solenoid valve 2 is controlled to open, so that the cooling water in the cooling water tank 7 flows into the cooling water pipeline 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; b. The cooling water outlet 106 is connected to a one-way valve 6, which can prevent the cooling water from flowing only from the water inlet to the water outlet of the housing 102. When the solenoid valve 2 is not opened, other substances cannot enter the cooling water path 4 of the dual magnetic source magnetic fluid sealing device 1 through the outlet 106.

[0030] Working mechanism and advantages of the present invention: a. The conventional magnetic fluid sealing device is only designed with 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 conductivity to the shaft. The pole shoe has better magnetic focusing performance, so that the leakage of the entire device is less, the magnetic induction intensity of the sealing gap is greater, and thus the sealing pressure of the device is also greater; b. The dual-magnetic-source magnetic fluid 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 further improved within the limited axial space, so that the device can have a greater sealing pressure; c. The housing 102 of the dual-magnetic-source magnetic fluid sealing device of the present invention is designed with a spiral water path winding around and covering the entire heating part of the device, which has better cooling efficiency and increases the reliability of the sealing of the device under high-speed working conditions; d. The housing 102 of the dual magnetic source magnetic fluid sealing device of the present invention is designed with a magnetic fluid replenishment port 105, which is connected to the tooth slot hole on the pole shoe. When the magnetic fluid in the sealing gap is insufficient, the magnetic fluid can be replenished through it. When the magnetic fluid does not need to be replenished, a temperature sensor can be connected to monitor the temperature in the sealing gap; e. The inner and outer permanent magnets of the dual-magnetic source magnetic fluid sealing device of the present invention are designed with non-magnetic sleeves 112, which can prevent the magnetic fluid under the permanent magnet from being absorbed by the permanent magnet during the rotation of the shaft, avoiding inconvenient cleaning during installation and disassembly. In addition, it can also prevent the magnetic fluid from being absorbed by the permanent magnet during the sealing process, resulting in insufficient magnetic fluid volume in the sealing gap, affecting the sealing performance The present invention is the embodiment of the present invention as described above. The above embodiments and the specific parameters in the embodiments are only for the purpose of clearly describing the invention verification process, and are not used to limit the patent protection scope of the present invention. The patent protection scope of the present invention is still subject to its claims. Any equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual magnetic source magnetic fluid sealing device, characterized in that: The dual-magnetic-source magnetic fluid sealing device (1) comprises a housing (102), a rotating shaft (8) being rotatably mounted inside the housing (102) via a bearing (107), an inner pole shoe (110), a permanent magnet sleeve (112) and an inner permanent magnet (113) being mounted on the rotating shaft (8), and the bearing (107) and the inner pole shoe (110) being axially limited via a sleeve (115); an outer pole shoe (109) and an outer permanent magnet (111) being radially positioned inside the housing (102); The outer shell (102) is provided with a water inlet (103), the water inlet (103) is connected to a cooling water path (104) inside the outer shell (102), and the outlet of the cooling water path (104) is connected to the water outlet (106); The housing (102) is provided with a plurality of magnetic fluid replenishing ports (105) for replenishing magnetic fluid, wherein the magnetic fluid replenishing ports (105) are communicated with the tooth slot holes on the pole shoe; the magnetic fluid replenishing ports (105) also serve as temperature measuring ports for measuring temperature.

2. A dual magnetic source magnetic fluid sealing device according to claim 1, characterized in that: The bearing (107) at one end is positioned by a shaft shoulder on the rotating shaft (8), and the bearing (107) at the other end is positioned by a fixed base (101) fixed to the end of the housing (102). The fixed base (101) is fixed to the housing (102) by a locking screw (114), so that the various parts do not move axially inside the housing.

3. A dual magnetic source magnetic fluid sealing device according to claim 1, characterized in that: A permanent magnet sleeve (112) is provided on the inner permanent magnet (113) and the outer permanent magnet (111), and the permanent magnet sleeve (112) is made of a non-magnetic conductive material.

4. A dual magnetic source magnetic fluid sealing device according to claim 1, characterized in that: The inner pole shoe (110) is made of magnetic conductive material.

5. The dual magnetic source magnetic fluid sealing device according to claim 1, characterized in that: The cooling water channel (104) adopts a spiral water channel.

6. A cooling control system for a dual magnetic source magnetic fluid sealing device, characterized in that: The cooling control system is used to cool the dual magnetic source magnetic fluid sealing device described in any one of claims 1 to 5, and the cooling control system comprises a dual magnetic source magnetic fluid sealing device (1), the water inlet (103) of the dual magnetic source magnetic fluid 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 magnetic fluid replenishment port (105), the temperature sensor (3) is connected to a data acquisition device (4), the data acquisition device (4) is connected to a control system (5), and the model output end of the control system (5) is connected to the solenoid valve (2) and controls the supply of cooling water.

7. The cooling control system of the dual magnetic source magnetic fluid sealing device according to claim 6, characterized in that: The temperature sensor (3) is connected to the magnetic fluid replenishment port (105) via a threaded structure.

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

9. The control method of the cooling control system of the dual magnetic source magnetic fluid sealing device according to claim 8, characterized in that: 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 in the magnetic fluid sealing gap collected by the temperature sensor (3) installed on the housing (102), the solenoid valve (2) is controlled to open, so that the cooling water in the cooling water tank (7) flows from the cooling water inlet (103) on the housing (102) into the cooling water pipeline (104), 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) so that the cooling water can only flow from the water inlet of the housing (102) to the water outlet. When the solenoid valve (2) is not opened, other substances cannot enter the cooling water path (4) of the dual magnetic source magnetic fluid sealing device (1) through the water outlet (106).

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