Key sealing device and sealing method for rotary shell type water ring pump

Abstract

The invention belongs to the technical field of liquid ring pumps, and particularly relates to a key sealing device and sealing method for a rotary shell type water ring pump, comprising a bracket, a base mounted on the bracket, a pump shell assembled on one side of the base, a sealing shell arranged on one side of the pump shell close to the base, and located on the outer side of the base, and a bearing arranged between the base and the sealing shell, the base and the pump shell are sealed through any one of the following four sealing structures, the first sealing structure is sealed through a dynamic sealing structure, the second sealing structure is sealed through a magnetic liquid sealing structure, and the third sealing structure is sealed through a sealing ring structure. And the fourth sealing structure is a combined structure of the three sealing structures for sealing. The rotary shell type water ring pump has the beneficial effects of being low in starting torque, low in friction resistance, high in sealing performance and the like, so that the rotary shell type water ring pump operates in a low-resistance and high-efficiency mode.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid ring pumps, and in particular relates to a key sealing device and a sealing method for a rotary shell type water ring pump. Background Art

[0002] As a vacuum pump, the water ring pump plays a vital role in the field of coal mine gas extraction. Since gas is a flammable and explosive gas, the use of vacuum pumps with metal friction surfaces (such as plunger pumps and rotary vane pumps) has safety hazards. Therefore, the water ring pump has become the preferred equipment for gas extraction due to its characteristics of no metal friction surface. However, the existing water ring pump has the problems of low efficiency and high energy consumption, which is contrary to the current national policy orientation of energy conservation and emission reduction;

[0003] At present, the efficiency of mainstream water ring pumps is generally low, ranging from 15% to 45%, resulting in a large amount of energy waste. For example, the annual power consumption of gas extraction pump stations in large and medium-sized high-gas mines in my country is very high. Taking Shanxi Lu'an Group as an example, the annual power consumption of more than 100 large water ring pumps in continuous operation in its affiliated coal mines exceeds 400 million kWh. Therefore, improving the efficiency of water ring pumps has become an urgent problem to be solved;

[0004] One of the main reasons for the low efficiency of water ring pumps is the friction resistance between the high-speed rotating fluid and the fixed pump casing. Studies have shown that the friction loss power accounts for 20%-40% of the total pump input power, and this proportion will further increase with the increase of speed. Therefore, reducing the friction resistance of the pump casing wall is the key to improving the working efficiency of water ring vacuum pumps.

[0005] In order to solve this problem, some researchers tried to break through the design limitations of the traditional "fixed pump casing", proposed a new idea of ​​"rotating pump casing", and designed a prototype of a rotating casing water ring pump. Experiments showed that the high-speed rotating water ring can drive the pump casing to rotate at high speed, effectively weakening the wall friction and reducing power consumption.

[0006] However, the rotary shell water ring pump faces new challenges in design, especially the dynamic seal between the pump casing and the base (or suction chamber). The traditional dynamic seal device is difficult to apply to the rotary shell water ring pump due to problems such as model, size, resistance, etc., and there is currently no clear method to control the dynamic seal at this location;

[0007] Therefore, the present invention proposes a key sealing device and sealing method for a rotating shell water ring pump, aiming to solve the above technical problems and improve the overall performance and efficiency of the water ring pump. Summary of the invention

[0008] The purpose of the present invention is to provide a key sealing device and sealing method for a rotary shell water ring pump, which can help achieve beneficial effects such as low starting torque, low friction resistance, and high sealing performance, so that the rotary shell water ring pump can operate with low resistance and high efficiency.

[0009] The technical solution adopted by the present invention is as follows:

[0010] The key sealing device and sealing method of a rotary shell water ring pump include a bracket, a base is installed on the bracket, a pump shell is assembled on one side of the base, a sealing shell is arranged on the side of the pump shell close to the base, and the sealing shell is located outside the base, and a bearing is arranged between the base and the sealing shell;

[0011] The base and the pump housing are sealed using any one of the following four sealing structures: the first sealing structure is sealed by a dynamic sealing structure, the second sealing structure is sealed by a magnetic fluid sealing structure, the third sealing structure is sealed by a sealing ring structure, and the fourth sealing structure is sealed by a combination of the above three sealing structures.

[0012] The first sealing structure includes a retaining ring fixed on the outside of the base and located at one end of the bearing close to the pump housing, a dynamic ring is fixed on the side of the pump housing close to the retaining ring and located on the inner side of the sealing shell, at least one spring is assembled on the side of the retaining ring close to the retaining ring, a static ring is installed on the end of the spring away from the retaining ring, and the static ring and the dynamic ring as well as the static ring and the base are all in contact with each other.

[0013] The second sealing structure comprises two pole shoes fixed to the inner wall of the sealing shell and located at one end of the bearing close to the pump housing, and a permanent magnet is installed between the two pole shoes, pole teeth are arranged on the inner side of the pole shoes, and magnetic fluid is arranged between the pole teeth and the outer wall of the base;

[0014] A water retaining ring is fixed on the side of the two pole shoes that are away from each other, isolation water is arranged between the water retaining ring and the outer wall of the base, and an air buffer zone is arranged between the isolation water and the magnetic fluid.

[0015] The third sealing structure includes an elastic sealing ring disposed between the sealing shell and the base and located at one end of the bearing close to the pump housing, and the elastic sealing ring includes at least one of a skeleton sealing ring, a polytetrafluoroethylene sealing ring and a pan-plug seal.

[0016] The fourth sealing structure comprises two pole shoes fixed to the inner wall of the sealing shell and located at one end of the bearing close to the pump housing, a permanent magnet is installed between the two pole shoes, pole teeth are arranged on the inner side of the pole shoes, and magnetic fluid is arranged between the pole teeth and the outer wall of the base;

[0017] An elastic sealing ring is arranged between the sealing shell and the base and on the side of the pole shoe close to the pump housing, and the elastic sealing ring includes at least one of a skeleton sealing ring, a polytetrafluoroethylene sealing ring and a pan-plug seal.

[0018] A sealing method for a key sealing device of a rotary shell water ring pump, the sealing method adopts a first sealing structure, and the sealing method is:

[0019] Through the setting of the spring, the spring bounces the static ring toward the dynamic ring, and makes the static ring and the dynamic ring close to each other, so as to achieve sealing.

[0020] A sealing method for a key sealing device of a rotary shell water ring pump, the sealing method adopts a second sealing structure, and the sealing method is:

[0021] The magnetic fluid arranged at the lower part of the pole teeth can seal the base and the sealed shell, and the isolation water can prevent the leakage of the magnetic fluid, and the air buffer zone arranged between the magnetic fluid and the isolation water can separate the magnetic fluid and the isolation water to avoid mixing of the two.

[0022] A sealing method for a key sealing device of a rotary shell water ring pump, the sealing method adopts a third sealing structure, and the sealing method is:

[0023] By disposing the elastic sealing ring, the elastic sealing ring can seal between the base and the sealing shell.

[0024] A sealing method for a key sealing device of a rotary shell water ring pump, the sealing method adopts a fourth sealing structure, and the sealing method is:

[0025] The sealing shell and the base can be sealed by the magnetic fluid, and the elastic sealing ring is arranged so that the elastic sealing ring strengthens the sealing between the two.

[0026] The technical effects achieved by the present invention are:

[0027] In view of the problem that it is difficult to achieve "low-resistance sealing" in a rotary shell type water ring pump, the present invention designs a sealing device and method with low-resistance characteristics, which helps to achieve beneficial effects such as low starting torque, low friction resistance, and high sealing, and helps the rotary shell type water ring pump to operate with low resistance and high efficiency, laying a foundation for the stable operation of the rotary shell type water ring pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the first sealing structure in the present invention;

[0029] Figure 2 is a structural schematic diagram of the second sealing structure in the present invention;

[0030] Figure 3 is a structural schematic diagram of the third sealing structure in the present invention;

[0031] Figure 4 is a structural schematic diagram of a fourth sealing structure in the present invention;

[0032] Figure 5 is a flow chart of the sealing method in the present invention;

[0033] Figure 6 It is a partial structural diagram of the water retaining ring in the second sealing structure of the present invention;

[0034] Figure 7 It is a partial dimension diagram of the water retaining ring in the second sealing structure of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1. Bracket; 2. Base; 3. Bearing; 4. Sealing shell; 5. Pump casing; 8. Elastic sealing ring; 61. Spring; 62. Static ring; 63. Moving ring; 64. Retaining ring; 71. Permanent magnet; 72. Pole shoe; 73. Pole tooth; 74. Magnetic fluid; 75. Isolation water; 76. Water retaining ring; 77. Air buffer zone; 81. Skeleton sealing ring; 82. PTFE sealing ring; 83. Pan seal. DETAILED DESCRIPTION

[0037] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0038] like Figure 1-Figure 7 As shown, the key sealing device of the rotary shell water ring pump comprises a bracket 1, a base 2 is mounted on the bracket 1, a pump casing 5 is assembled on one side of the base 2, a sealing shell 4 is arranged on the side of the pump casing 5 close to the base 2, and the sealing shell 4 is located on the outside of the base 2, and a bearing 3 is arranged between the base 2 and the sealing shell 4;

[0039] The base 2 and the pump housing 5 are sealed by any one of the following four sealing structures. The first sealing structure is sealed by a dynamic sealing structure, the second sealing structure is sealed by a magnetic liquid sealing structure, the third sealing structure is sealed by a sealing ring structure, and the fourth sealing structure is sealed by a combination of the above three sealing structures. The first sealing structure adopts an unconventional mechanical sealing device, the second sealing structure adopts a magnetic liquid sealing device with waterproof and air-proof functions, the third sealing structure adopts an elastic sealing device, and the fourth sealing structure adopts a combination of the above schemes.

[0040] Embodiment 1:

[0041] This embodiment discloses the specific structure and function of the first sealing structure as follows:

[0042] like Figure 1As shown, in the conventional mechanical seal, the static ring 62 is fixed together with the pump housing 5, the dynamic ring 63 rotates together with the shaft, the base 2 is fixedly connected to the bracket 1 by bolts, the bearing 3 is mounted and fixed on the base 2, the positioning between the bearings 3 is achieved by a sleeve, the first sealing structure includes a retaining ring 64 fixed to the outside of the base 2 and located at one end of the bearing 3 close to the pump housing 5, the dynamic ring 63 is fixed on one side of the pump housing 5 close to the retaining ring 64 and located on the inner side of the sealing shell 4, and the retaining ring 64 is equipped with at least one spring 61 on one side close to the retaining ring 64. When there is one spring 61, it can be an integral spring 61 surrounding the base 2. When there are multiple springs 61, they can be multiple small springs 61. A static ring 62 is installed at one end of the spring 61 away from the retaining ring 64, and the static ring 62 and the dynamic ring 63 as well as the static ring 62 and the base 2 are all fitted to each other. The static ring 62 and the base 2 are sealed by a static sealing ring or elastic rubber, and the dynamic ring 63 and the pump housing 5 are sealed by a static sealing ring. The static ring 62 and the dynamic ring 63 are sealed by the fitting surface to achieve a dynamic sealing function.

[0043] During sealing, the spring 61 is arranged so that the spring 61 bounces the static ring 62 toward the dynamic ring 63 and makes the static ring 62 and the dynamic ring 63 close to each other, thereby achieving a sealing effect;

[0044] The method of preload control is as follows: use experimental methods or empirical formulas to adjust the preload under different pressure differential conditions. When the leakage rate reaches the set threshold, record the preload value, determine the relationship between the preload and the pressure differential, and determine the relationship between the friction resistance and the preload. Determine the preload based on the relationship between the preload and the pressure differential, and determine the number of springs 61, the elastic coefficient, and the compression amount based on the preload.

[0045] Embodiment 2:

[0046] This embodiment discloses the specific structure and function of the second sealing structure as follows:

[0047] See attached Figure 2 and attached Figure 6 As shown, the sealing housing 4 and the pump housing 5 are relatively fixed, and the sealing housing 4 rotates with the pump housing 5. The sealing housing 4 is rotatably connected to the base 2 through the bearing 3, and the base 2 is fixedly connected to the bracket 1. Functional holes, such as shaft holes, air intake holes, exhaust holes, water injection holes, etc., are reserved in the base 2. The base 2 is fixedly connected to the bracket 1 by bolts, and the bearing 3 is installed and fixed on the base 2. The positioning between the bearings 3 is achieved by a sleeve;

[0048] The second sealing structure includes two pole shoes 72 fixed to the inner wall of the sealing housing 4 and located at one end of the bearing 3 close to the pump housing 5, and a permanent magnet 71 is installed between the two pole shoes 72, and pole teeth 73 are arranged on the inner side of the pole shoes 72. A magnetic fluid 74 is arranged between the pole teeth 73 and the outer wall of the base 2 to form a magnetic fluid sealing ring;

[0049] A water retaining ring 76 is fixed to the side of the two pole shoes 72 away from each other. Isolation water 75 is provided between the water retaining ring 76 and the outer wall of the base 2. Water isolation water 75 is injected into the water retaining ring 76. An air buffer zone 77 is provided between the isolation water 75 and the magnetic fluid 74. The air buffer zone 77 separates the magnetic fluid 74 from the right isolation water 75. A static sealing ring is installed between the water retaining ring 76 and the pole shoe 72 to prevent air leakage.

[0050] See attached Figure 7 The inner side of the water retaining ring 76 is stepped, and the distance between the inner surface of the water retaining ring 76 and the outer surface of the base 2 is H 1 and H 2 , the spacing is H 1 Partially filled with air buffer 77, spacing H 2 The magnetic fluid 74 is partially filled with isolation water 75, and the air buffer zone 77 in the water retaining ring 76 separates the magnetic fluid 74 from the isolation water 75 to prevent water pollution in the pump from damaging the magnetic fluid 74. Generally, the water retaining ring 76 plays the role of waterproofing and air-isolating. A coil is wound around the outer side of the permanent magnet 71. When the coil is energized, it can generate a magnetic field opposite to that of the permanent magnet 71. When the equipment is started, the coil is energized to reduce the resistance of the magnetic fluid 74 and reduce the starting torque.

[0051] The magnetic fluid 74 disposed at the lower part of the pole teeth 73 can seal the base 2 and the sealed housing 4, and the isolation water 75 can prevent the magnetic fluid 74 from leaking, and the air buffer zone 77 disposed between the magnetic fluid 74 and the isolation water 75 can separate the magnetic fluid 74 and the isolation water 75 to prevent the two from mixing, thereby preventing the external water from contaminating the magnetic fluid 74.

[0052] And size H 1 Less than H 2 , size L 1 Less than L 2 .

[0053] Magnetic field force control method: First, according to the internal and external pressure difference requirements, select the appropriate permanent magnet 71 and magnetic fluid 74, determine the magnetic field strength in the magnetic fluid 74 according to the magnetic field strength and the number and size of the pole teeth 73, and calculate and determine the magnetic field force in combination with the magnetic properties of the magnetic fluid 74. The magnetic field force can also be measured experimentally. In addition, the resistance of the magnetic fluid 74 when the pump housing 5 rotates can be measured experimentally.

[0054] Embodiment 3:

[0055] This embodiment discloses the specific structure and function of the third sealing structure as follows:

[0056] Reference Figure 4 The base 2 is fixedly connected to the bracket 1 by bolts, and the bearing 3 is installed and fixed on the base 2. The positioning between the bearings 3 is achieved by a sleeve. The third sealing structure includes an elastic sealing ring 8 arranged between the sealing shell 4 and the base 2 and located at one end of the bearing 3 close to the pump housing 5. The elastic sealing ring 8 includes at least one of a skeleton sealing ring 81, a polytetrafluoroethylene sealing ring 82 and a pan seal 83;

[0057] By setting the elastic sealing ring 8, the elastic sealing ring 8 can seal between the base 2 and the sealing shell 4;

[0058] Dynamic friction force control method: According to the pressure difference between the inside and outside of the water ring pump, the dynamic friction resistance is minimized under the premise of ensuring sealing. Based on this principle, the preload of the elastic sealing ring 8 is determined by controlling the pre-compression amount and the elastic coefficient, or by experimental measurement.

[0059] Embodiment 4:

[0060] This embodiment discloses the specific structure and function of the fourth sealing structure as follows:

[0061] Reference Figure 4 , the base 2 is fixedly connected to the bracket 1 by bolts, the bearing 3 is installed and fixed on the base 2, and the positioning between the bearings 3 is achieved by a sleeve. The fourth sealing structure includes two pole shoes 72 fixed to the inner wall of the sealing shell 4 and located at one end of the bearing 3 close to the pump shell 5, a permanent magnet 71 is installed between the two pole shoes 72, a pole tooth 73 is arranged on the inner side of the pole shoe 72, and a magnetic fluid 74 is arranged between the pole tooth 73 and the outer wall of the base 2;

[0062] An elastic sealing ring 8 is provided between the sealing housing 4 and the base 2 and on the side of the pole shoe 72 close to the pump housing 5, and the elastic sealing ring 8 includes at least one of a skeleton sealing ring 81, a polytetrafluoroethylene sealing ring 82 and a flood seal 83;

[0063] Through this arrangement, the magnetic fluid 74 can seal between the sealing shell 4 and the base 2, and through the arrangement of the elastic sealing ring 8, the elastic sealing ring 8 further strengthens the sealing effect of the two.

[0064] See attached Figure 5, according to the pressure difference requirements inside and outside the water ring pump and the sealing performance and resistance performance of each level of seal, the sealing type is comprehensively determined. Taking a certain threshold leakage rate, such as 0.01%, as a benchmark, the sealing pressure difference borne by the sealing device is recorded as dp. The leakage rate of the sealing device under this pressure difference is 0.01%, and the useless power consumed by the corresponding friction resistance is recorded as Pf. Then dp / Pf characterizes the quality of the sealing device. The larger the value, the better the sealing and the lower the loss. Since the dp / Pf of different sealing devices is not a constant value, this value depends on factors such as dp and rotation speed. Therefore, it is necessary to reasonably select the sealing type under different pressure difference dp conditions, in order to minimize the sealing resistance while ensuring the sealing.

[0065] First, determine whether it is single-stage sealing or multi-stage sealing according to the sealing requirements. If it is single-stage sealing, determine the sealing type and choose Option 1, Option 2 or Option 3 respectively. If multi-stage sealing is selected, choose Option 4. In each option, the sealing control is mainly achieved by adjusting the preload force or magnetic field force.

[0066] The principle of mechanical seal preload control in scheme 1 is: under specific internal and external pressure difference conditions, the friction resistance is minimized while ensuring the seal. The preload of spring 61 in the mechanical seal is determined based on this principle, and the preload of spring 61 is controlled by controlling the number, elastic coefficient and compression amount of spring 61.

[0067] Method for controlling magnetic field force in scheme 2: According to the pressure difference between the inside and outside of the water ring pump, the magnetic field strength of the permanent magnet 71, the number of pole teeth 73, the distance between the pole teeth 73 and the magnetic seal inner shell, etc. are calculated and determined. If the starting torque is too large, a reverse magnetic field is applied by the energized coil to overcome it.

[0068] The method for controlling dynamic friction in scheme three is as follows: based on the pressure difference between the inside and outside of the water ring pump, the dynamic friction resistance is minimized under the premise of ensuring sealing. Based on this principle, the preload force of the elastic sealing ring 8 is determined by controlling the pre-compression amount and the elastic coefficient, or by experimental measurement.

[0069] Sealing method in scheme 4: adopt multi-stage combined sealing method, according to the pressure difference condition inside the water ring pump, the total pressure difference dp is disassembled and distributed to each stage of sealing dp=dp2+dp3, and the sealing parameters of each stage are determined according to the pressure difference requirement of each stage of sealing. The specific sealing parameters are the same as the first three schemes.

[0070] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A key sealing device of a rotary shell water ring pump, comprising a bracket (1), characterized in that: A base (2) is mounted on the bracket (1); a pump housing (5) is mounted on one side of the base (2); a sealing housing (4) is disposed on a side of the pump housing (5) close to the base (2); the sealing housing (4) is located outside the base (2); and a bearing (3) is disposed between the base (2) and the sealing housing (4); The base (2) and the pump housing (5) are sealed using any one of the following four sealing structures: the first sealing structure is sealed using a dynamic sealing structure, the second sealing structure is sealed using a magnetic fluid sealing structure, the third sealing structure is sealed using a sealing ring structure, and the fourth sealing structure is sealed using a combination of the above three sealing structures.

2. The key sealing device of a rotary shell water ring pump according to claim 1, characterized in that: The first sealing structure comprises a retaining ring (64) fixed on the outer side of the base (2) and located at one end of the bearing (3) close to the pump housing (5); a dynamic ring (63) is fixed on the side of the pump housing (5) close to the retaining ring (64) and located on the inner side of the sealing shell (4); at least one spring (61) is mounted on the side of the retaining ring (64) close to the retaining ring (64); a static ring (62) is mounted on the end of the spring (61) away from the retaining ring (64); and the static ring (62) and the dynamic ring (63) as well as the static ring (62) and the base (2) are in contact with each other.

3. The key sealing device of a rotary shell water ring pump according to claim 1 is characterized in that: The second sealing structure comprises two pole shoes (72) fixed to the inner wall of the sealing shell (4) and located at one end of the bearing (3) close to the pump housing (5), and a permanent magnet (71) is installed between the two pole shoes (72), a pole tooth (73) is arranged on the inner side of the pole shoe (72), and a magnetic fluid (74) is arranged between the pole tooth (73) and the outer wall of the base (2); A water retaining ring (76) is fixed on the side of the two pole shoes (72) that is away from each other, isolation water (75) is arranged between the water retaining ring (76) and the outer wall of the base (2), and an air buffer zone (77) is arranged between the isolation water (75) and the magnetic fluid (74).

4. The key sealing device of a rotary shell water ring pump according to claim 1, characterized in that: The third sealing structure comprises an elastic sealing ring (8) disposed between the sealing housing (4) and the base (2) and located at one end of the bearing (3) close to the pump housing (5), wherein the elastic sealing ring (8) comprises at least one of a skeleton sealing ring (81), a polytetrafluoroethylene sealing ring (82) and a pan-seal (83).

5. The key sealing device of a rotary shell water ring pump according to claim 1, characterized in that: The fourth sealing structure comprises two pole shoes (72) fixed to the inner wall of the sealing housing (4) and located at one end of the bearing (3) close to the pump housing (5), a permanent magnet (71) is mounted between the two pole shoes (72), pole teeth (73) are arranged on the inner side of the pole shoes (72), and magnetic fluid (74) is arranged between the pole teeth (73) and the outer wall of the base (2); An elastic sealing ring (8) is provided between the sealing shell (4) and the base (2) and located on a side of the pole shoe (72) close to the pump housing (5), and the elastic sealing ring (8) includes at least one of a skeleton sealing ring (81), a polytetrafluoroethylene sealing ring (82) and a pan-plug seal (83).

6. The sealing method of the key sealing device of the rotary shell water ring pump is characterized by: The sealing method adopts the first sealing structure in the key sealing device of the rotary shell water ring pump according to claim 2, and the sealing method is: A spring (61) is provided, and the spring (61) bounces the stationary ring (62) toward the dynamic ring (63), and makes the stationary ring (62) and the dynamic ring (63) closely attached to complete the sealing.

7. The sealing method of the key sealing device of the rotary shell water ring pump is characterized by: The sealing method adopts the second sealing structure in the key sealing device of the rotating shell water ring pump according to claim 3, and the sealing method is: A magnetic fluid (74) is arranged at the bottom of the pole teeth (73) to seal between the base (2) and the sealing housing (4); Isolation water (75) is arranged between the water retaining ring (76) and the outer wall of the base (2), and the magnetic fluid (74) is prevented from leaking by the isolation water (75). An air buffer zone (77) is arranged between the magnetic fluid (74) and the isolation water (75), and the air buffer zone (77) separates the magnetic fluid (74) and the isolation water (75).

8. The sealing method of the key sealing device of the rotary shell water ring pump is characterized by: The sealing method adopts the third sealing structure in the key sealing device of the rotating shell water ring pump according to claim 4, and the sealing method is: An elastic sealing ring (8) is arranged at one end of the bearing (3) close to the pump housing (5); the elastic sealing ring (8) can seal between the base (2) and the sealing housing (4).

9. The sealing method of the key sealing device of the rotary shell water ring pump is characterized by: The sealing method adopts the fourth sealing structure in the key sealing device of the rotating shell water ring pump according to claim 5, and the sealing method is: The sealing shell (4) and the base (2) can be sealed by the magnetic fluid (74), and the elastic sealing ring (8) is provided so that the elastic sealing ring (8) is sealed again.

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