A kind of through-cabin rotating sealing device

Abstract

A through-cabin rotary sealing device includes a rotating shaft and a sleeve, wherein a plurality of steps are arranged on the rotating shaft, and a plurality of reflux chambers are arranged on the steps along the circumference thereof, and a plurality of reflux chambers are formed in the sleeve, and a plurality of reflux chambers are also arranged on the circumference thereof, and the reflux chambers include a plane chamber and an arc chamber; the rotating shaft is arranged in the sleeve, and the steps and the reflux chambers match each other, and a plurality of reflux chambers are interconnected to form a Tesla valve-shaped chamber; in the present invention, water flows into the reflux chamber through the gap between the rotating shaft and the sleeve, and the water flows back after passing through the plane chamber and the arc chamber, collides with the subsequent water flow, generates resistance, and then blocks the entry of part of the water flow, and a plurality of reflux chambers repeatedly weaken the water flow pressure, thereby achieving the effect of suppressing the amount of water inflow. This design can not only keep the shaft gap appropriate, thereby reducing the friction between the shaft and the peripheral contact surface, and reducing the waste of equipment power, but also suppress the situation that the amount of water inflow increases with the increase of water pressure.

Description

Technical Field

[0001] The invention relates to a sealing device, belongs to the field of sealing devices, and in particular to a cabin-penetrating rotating sealing device. Background Art

[0002] At present, in the field of ship equipment, a large number of through-cabin rotary dynamic seals are used in underwater environments, such as the propellers of submersibles, so that the power source is set inside the cabin and the working mechanism is set in the water outside the cabin. The two are connected by a rotating shaft, and a rotary dynamic seal is used to prevent a large amount of seawater outside the cabin from entering the cabin.

[0003] Since the rotation of the shaft itself requires a certain gap, it is impossible to completely avoid seawater from entering the cabin through the gap around the rotating shaft. To address this situation, the industry currently usually controls the gap size to minimize the amount of water entering the cabin, and at the same time installs water collection or pumping devices in the cabin to avoid water accumulation in the cabin.

[0004] However, this method has the following defects: 1. The smaller the gap size, the greater the resistance on the gap path for seawater to enter, and the smaller the flow rate, but at the same time, the contact surface between the shaft and the surrounding area requires a greater pressure, so that the friction on the shaft is greater, and the output device power is wasted more; 2. The greater the working water depth, the greater the pressure difference between the cabin and the seawater, while the gap itself is fixed, and the resistance on the gap path for seawater to enter does not change, so the incoming water flow rate will increase rapidly with the increase in depth.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects and problems in the prior art: 1. The smaller the gap between the rotating shaft and the sleeve, the greater the friction on the shaft body, and more power is required to drive it, resulting in additional consumption of driving power; 2. The deeper the machinery is submerged in water, the greater the water pressure, and the increase in pressure will cause more water to enter the mechanical equipment through the gap between the rotating shaft and the sleeve, and to provide a through-cabin rotating sealing device, the structure of which can maintain an appropriate gap between the shaft and the sleeve, thereby reducing the friction between the shaft and the peripheral contact surface, reducing the waste of equipment power, and suppressing the situation where the water inlet volume increases with the increase in water pressure.

[0007] To achieve the above objectives, the technical solution of the present invention is: a through-cabin rotary sealing device, comprising a rotating shaft and a shaft sleeve, wherein the rotating shaft comprises an inner shaft body and an outer shaft body, and a first ring step, a second ring step and a third ring step are arranged in the area between the inner shaft body and the outer shaft body;

[0008] The first step, the second step and the third step are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first step, the second step and the third step are consistent; the diameters of the large diameter ends of the first step, the second step and the third step are consistent;

[0009] The inner shaft body is connected to the large diameter end of the first step, the small diameter end of the first step is connected to the small diameter end of the second step, the large diameter end of the second step is connected to the large diameter end of the third step, and the small diameter end of the third step is connected to the outer shaft body; the diameters of the inner shaft body and the outer shaft body are consistent with the small diameter end of the first step;

[0010] The first step is provided with a plurality of first reflow cavities along its circumference, wherein the first reflow cavities include a first plane cavity and a first arc cavity;

[0011] One end of the first plane cavity is located at the small diameter end of the first step, and the other end of the first plane cavity extends to the lower left side toward the inner shaft body; one end of the first arc cavity is connected to the first plane cavity, and the other end of the first arc cavity extends upward to the outer surface of the first step;

[0012] The sleeve comprises a bottom plate and a sleeve body, the sleeve body is a hollow cylinder, and a first cavity, a second cavity and a third cavity are formed in the sleeve body;

[0013] The first circle cavity, the second circle cavity and the third circle cavity are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle cavity, the second circle cavity and the third circle cavity are consistent; the diameters of the large diameter ends of the first circle cavity, the second circle cavity and the third circle cavity are consistent;

[0014] The bottom plate is connected to the large diameter end of the first circle cavity, the small diameter end of the first circle cavity is connected to the small diameter end of the second circle cavity, and the large diameter end of the second circle cavity is connected to the large diameter end of the third circle cavity;

[0015] The second ring cavity is provided with a plurality of second reflow cavities along its circumference, and the second reflow cavities include a second plane cavity and a second arc cavity;

[0016] One end of the second plane cavity is located at the large diameter end of the second circle cavity, and the other end of the second plane cavity extends to the upper left side toward the bottom plate; one end of the second arc cavity is connected to the second plane cavity, and the other end of the second arc cavity extends downward to the inner surface of the second circle cavity;

[0017] The rotating shaft is inserted into the shaft sleeve, the first circle step matches the first circle cavity, the second circle step matches the second circle cavity, and the third circle step matches the third circle cavity; the first reflux cavity and the second reflux cavity are connected to each other to form a Tesla valve-shaped cavity.

[0018] The first plane cavity and the outer inclined surface of the second circle step are in a straight line; the second plane cavity and the inner inclined surface of the third circle cavity are in a straight line.

[0019] The tangent angle of the connection point between the first arc-shaped cavity and the outer inclined surface of the first circle step is greater than degrees; the tangent angle of the connection point between the second arc-shaped cavity and the inner inclined surface of the second circle cavity is greater than degrees.

[0020] The first arc-shaped cavity extends upward to the middle of the outer surface of the first circle step; the second arc-shaped cavity extends downward to the middle of the inner surface of the second circle cavity.

[0021] The first reflux chamber and the second reflux chamber are arranged staggered along the circumference, so that their widths can cover the entire circumference in axial projection.

[0022] Both ends of the rotating shaft are provided with keyways.

[0023] The bottom plate is fixedly connected to the shaft sleeve body, and the bottom plate is sealingly connected to the bulkhead.

[0024] The sealing connection is to weld the bottom plate to the bulkhead

[0025] The bottom plate is provided with a plurality of through holes.

[0026] The sealing connection is that an elastic sealing member is arranged between the bottom plate and the bulkhead, and the bottom plate, the elastic sealing member and the bulkhead are pressed and sealed by bolts.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. A through-cabin rotary sealing device of the present invention comprises a rotating shaft and a sleeve, wherein the rotating shaft comprises an inner shaft body and an outer shaft body, a plurality of steps are arranged in the area between the inner shaft body and the outer shaft body, a plurality of first reflux chambers are arranged on the steps along the circumference thereof, the first reflux chambers comprise a first plane chamber and a first arc chamber, the sleeve comprises a bottom plate and a sleeve body, a circle chamber is formed in the sleeve body, a plurality of second reflux chambers are arranged on the circle chamber along the circumference thereof, the second reflux chamber comprises a second plane chamber and a second arc chamber, the rotating shaft is passed through the sleeve, the steps and the circle chamber match each other, the first reflux chamber and the second reflux chamber are connected to each other to form a Tesla valve-shaped chamber; when the present design is applied, (1) water flows into the second plane chamber of the second reflux chamber through the gap between the rotating shaft and the sleeve, and then flows into the second arc chamber along the second plane chamber. Since the second arc cavity is an arc, the incoming water flow returns along the second arc cavity and collides with the subsequent incoming water flow, thereby generating resistance, slowing down the entry speed of the subsequent water flow, and the unblocked water flow continues to flow into the next reflux cavity, and this cycle repeats, greatly reducing the amount of water entering; due to this design, the gap between the rotating shaft and the sleeve can also be kept appropriate, and under the same water inflow index, the friction between the shaft and the sleeve is reduced, reducing the waste of driving power consumption; (2) The gap between the rotating shaft and the sleeve remains unchanged. When the water depth increases, the water pressure will also increase. The increase in water pressure will lead to an increase in the amount of water entering the gap, and the reflux pressure generated by the incoming water flow will also be greater. The force of the water pressure will react on the subsequent water flow, thereby weakening the influence of the depth increase on the amount of water entering. Therefore, the present invention not only reduces the friction between the shaft and the peripheral contact surface while maintaining an appropriate gap between the rotating shaft, reduces the waste of equipment power, and suppresses the situation where the amount of water entering increases with the increase in water pressure.

[0029] 2. The present invention provides a through-cabin rotary sealing device, wherein the first plane cavity and the outer slope of the second step are in a straight line; the second plane cavity and the inner slope of the third cavity are in a straight line; the tangent angle of the connection point between the first arc cavity and the outer slope of the first step is greater than 90 degrees; the tangent angle of the connection point between the second arc cavity and the inner slope of the second cavity is greater than 90 degrees; the first arc cavity extends upward to the middle of the outer surface of the first step; the second arc cavity extends downward to the middle of the inner surface of the second cavity; when the present design is used, the plane cavity and the outer slope are in a straight line, thereby guiding the water flow to enter the reflux cavity first; the tangent angle of the connection point between the arc cavity and the step is greater than 90 degrees, which ensures that the water flow in the reflux direction can fully hinder the incoming water flow; the arc cavity extends to the middle of the outer surface, reducing the length of the flow channel and accelerating the speed of the reflux force; therefore, the present invention not only reduces the friction of the rotating shaft at the through-cabin portion, reduces the waste of output power of the power equipment in the cabin, but also weakens the influence of the increased depth on the water intake.

[0030] 3. In a through-cabin rotary sealing device of the present invention, the first reflux chamber and the second reflux chamber are arranged staggered along the circumference, so that their width in the axial projection can cover the entire circumference; when the present design is used, the staggered arrangement ensures that the water flow entering the gap space from the outside can be subjected to the reflux resistance of at least one reflux chamber. Therefore, the present invention can not only reduce the friction of the rotating shaft at the through-cabin part, but also make the reflux chamber more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the rotating shaft in the present invention.

[0033] Figure 3 It is a schematic structural diagram of the first reflux chamber in the present invention.

[0034] Figure 4 It is a structural schematic diagram of the keyway in the present invention.

[0035] Figure 5 It is a structural schematic diagram of the shaft sleeve in the present invention.

[0036] Figure 6 It is a schematic structural diagram of the second reflux chamber in the present invention.

[0037] Figure 7 It is a schematic diagram of the structure of the perforation in the present invention.

[0038] Figure 8 It is a schematic diagram of the connection between the rotating shaft, the shaft sleeve, the bulkhead and the elastic sealing member in the present invention.

[0039] In the figure: shaft 1, sleeve 2, Tesla valve-shaped cavity 3, inner shaft body 4, keyway 5, first reflux cavity 6, first circle step 7, second circle step 8, third circle step 9, outer shaft body 10, through hole 11, first circle cavity 12, second circle cavity 13, third circle cavity 14, bottom plate 15, sleeve body 16, second reflux cavity 17, bulkhead 18, elastic seal 19, first plane cavity 20, first arc cavity 21, second plane cavity 22, second arc cavity 23. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] See also Figure 1 — Figure 8 A through-cabin rotary sealing device comprises a rotating shaft 1 and a shaft sleeve 2, wherein the rotating shaft 1 comprises an inner shaft body 4 and an outer shaft body 10, and a first ring step 7, a second ring step 8 and a third ring step 9 are arranged in the area between the inner shaft body 4 and the outer shaft body 10;

[0042] The first circle step 7, the second circle step 8 and the third circle step 9 are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle step 7, the second circle step 8 and the third circle step 9 are consistent; the diameters of the large diameter ends of the first circle step 7, the second circle step 8 and the third circle step 9 are consistent;

[0043] The inner shaft body 4 is connected to the large diameter end of the first step 7, the small diameter end of the first step 7 is connected to the small diameter end of the second step 8, the large diameter end of the second step 8 is connected to the large diameter end of the third step 9, and the small diameter end of the third step 9 is connected to the outer shaft body 10; the diameters of the inner shaft body 4 and the outer shaft body 10 are consistent with the small diameter end of the first step 7;

[0044] A plurality of first reflow chambers 6 are disposed on the first step 7 along its circumference, and the first reflow chamber 6 includes a first plane chamber 20 and a first arc chamber 21;

[0045] One end of the first plane cavity 20 is located at the small diameter end of the first circle step 7, and the other end of the first plane cavity 20 extends to the lower left side toward the inner shaft body 4; one end of the first arc cavity 21 is connected to the first plane cavity 20, and the other end of the first arc cavity 21 extends upward to the outer surface of the first circle step 7;

[0046] The sleeve 2 includes a bottom plate 15 and a sleeve body 16. The sleeve body 16 is a hollow cylinder, and a first cavity 12, a second cavity 13 and a third cavity 14 are formed in the sleeve body 16.

[0047] The first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are consistent; the diameters of the large diameter ends of the first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are consistent;

[0048] The bottom plate 15 is connected to the large diameter end of the first cavity 12, the small diameter end of the first cavity 12 is connected to the small diameter end of the second cavity 13, and the large diameter end of the second cavity 13 is connected to the large diameter end of the third cavity 14;

[0049] The second ring cavity 13 is provided with a plurality of second reflow cavities 17 along its circumference, and the second reflow cavities 17 include a second plane cavity 22 and a second arc cavity 23;

[0050] One end of the second plane cavity 22 is located at the large diameter end of the second circle cavity 13, and the other end of the second plane cavity 22 extends to the upper left side toward the bottom plate 15; one end of the second arc cavity 23 is connected to the second plane cavity 22, and the other end of the second arc cavity 23 extends downward to the inner surface of the second circle cavity 13;

[0051] The rotating shaft 1 is inserted into the shaft sleeve 2, the first circle step 7 matches the first circle cavity 12, the second circle step 8 matches the second circle cavity 13, and the third circle step 9 matches the third circle cavity 14; the first reflux cavity 6 and the second reflux cavity 17 are connected to each other to form a Tesla valve-shaped cavity 3.

[0052] The first plane cavity 20 and the outer inclined surface of the second circle step 8 are in a straight line; the second plane cavity 22 and the inner inclined surface of the third circle cavity 14 are in a straight line.

[0053] The tangent angle of the connection point between the first arc cavity 21 and the outer inclined surface of the first circle step 7 is greater than 90 degrees; the tangent angle of the connection point between the second arc cavity 23 and the inner inclined surface of the second circle cavity 13 is greater than 90 degrees.

[0054] The first arc-shaped cavity 21 extends upward to the middle of the outer surface of the first circle step 7 ; the second arc-shaped cavity 23 extends downward to the middle of the inner surface of the second circle cavity 13 .

[0055] The first reflux chamber 6 and the second reflux chamber 17 are arranged staggered along the circumference, so that their widths can cover the entire circumference in the axial projection.

[0056] Keyways 5 are provided at both ends of the rotating shaft 1 .

[0057] The bottom plate 15 is fixedly connected to the shaft sleeve body 16 , and the bottom plate 15 is sealedly connected to the bulkhead 18 .

[0058] The sealing connection is to weld the bottom plate 15 to the bulkhead 18

[0059] The bottom plate 15 is provided with a plurality of through holes 11 .

[0060] The sealing connection is that an elastic sealing member 19 is provided between the bottom plate 15 and the bulkhead 18 , and the bottom plate 15 , the elastic sealing member 19 and the bulkhead 18 are pressed and sealed by bolts.

[0061] The principle of the present invention is described as follows: a through-cabin rotary sealing device comprises a rotating shaft and a sleeve, a plurality of ring steps are arranged on the rotating shaft, and the plurality of ring steps are all pancake-shaped truncated cones, the large diameter ends between the ring steps are connected to the large diameter ends, and the small diameter ends are connected to the small diameter ends, and a plurality of first reflux chambers are arranged on the ring steps along their circumference, and the first reflux chambers comprise a first plane chamber and a first arc chamber; a plurality of ring chambers and a second reflux chamber matching the rotating shaft are arranged in the sleeve; the first reflux chamber and the second reflux chamber are connected to each other to form a Tesla valve-shaped chamber; when used, the step-shaped matching shape causes the entry path to be in an obtuse angle tortuous shape, When the water flows through a corner, a part of the water flows into the reflux chamber, and then forms a reflux when flowing out of the reflux chamber, forming resistance to the water flow passing through the outlet, thereby greatly increasing the water resistance in the gap, thereby reducing the water inlet flow rate. The first reflux chamber and the second reflux chamber form a continuous similar cavity, which continuously blocks the water flow and further reduces the water flow pressure. Due to the use of this structure, the gap between the shaft and the sleeve does not need to be set too small, and the friction between the shaft and the sleeve is reduced accordingly, saving driving power, and also suppressing the situation where the water inlet volume increases due to the increase in water pressure.

[0062] Embodiment 1:

[0063] See also Figure 1-Figure 8A through-cabin rotary sealing device comprises a rotating shaft 1 and a shaft sleeve 2 (preferably made of common industrial materials, such as copper), the rotating shaft 1 comprises an inner shaft body 4 and an outer shaft body 10, a first step 7, a second step 8 and a third step 9 are arranged in the area between the inner shaft body 4 and the outer shaft body 10 (preferably, a plurality of steps can be arranged according to specific needs); the first step 7, the second step 8 and the third step 9 are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first step 7, the second step 8 and the third step 9 are consistent; the diameters of the large diameter ends of the first step 7, the second step 8 and the third step 9 are consistent; the inner shaft body 4 is connected to the large diameter end of the first step 7, and the small diameter end of the first step 7 is consistent. The diameter end is connected to the small diameter end of the second step 8, the large diameter end of the second step 8 is connected to the large diameter end of the third step 9, and the small diameter end of the third step 9 is connected to the outer shaft body 10; the diameters of the inner shaft body 4 and the outer shaft body 10 are consistent with the small diameter end of the first step 7; the first step 7 is provided with a plurality of first reflow cavities 6 along its circumference (preferably, reflow cavities can be provided on all steps), and the first reflow cavity 6 includes a first plane cavity 20 and a first arc cavity 21; one end of the first plane cavity 20 is located at the small diameter end of the first step 7, and the other end of the first plane cavity 20 extends to the lower left toward the inner shaft body 4; one end of the first arc cavity 21 is connected to the first plane cavity 20 , the other end of the first arc-shaped cavity 21 extends upward to the outer surface of the first circle step 7; the sleeve 2 includes a bottom plate 15 and a sleeve body 16, the sleeve body 16 is a hollow cylinder (preferably assembled in combination), and a first circle cavity 12, a second circle cavity 13 and a third circle cavity 14 are formed in the sleeve body 16 (preferably, multiple circles can be provided according to specific needs); the first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are consistent; the diameters of the large diameter ends of the first circle cavity 12, the second circle cavity 13 and the third circle cavity 14 are consistent; the bottom plate 15 and the first circle cavity 12 The first circle cavity 12 is connected to the second circle cavity 13 at the large diameter end, the small diameter end of the first circle cavity 12 is connected to the small diameter end of the second circle cavity 13, and the large diameter end of the second circle cavity 13 is connected to the large diameter end of the third circle cavity 14; the second circle cavity 13 is provided with a plurality of second reflux cavities 17 along its circumference (preferably, reflux cavities can be provided in all circle cavities), and the second reflux cavity 17 includes a second plane cavity 22 and a second arc cavity 23; one end of the second plane cavity 22 is located at the large diameter end of the second circle cavity 13, and the other end of the second plane cavity 22 extends to the upper left toward the bottom plate 15; one end of the second arc cavity 23 is connected to the second plane cavity 22, and the other end of the second arc cavity 23 extends downward to the inner surface of the second circle cavity 13;The rotating shaft 1 is inserted into the shaft sleeve 2, the first ring step 7 matches the first ring cavity 12, the second ring step 8 matches the second ring cavity 13, and the third ring step 9 matches the third ring cavity 14; the first reflux cavity 6 and the second reflux cavity 17 are connected to each other to form a Tesla valve-shaped cavity 3.

[0064] When in use, the gap between the rotating shaft 1 and the sleeve 2 is the entrance of the water flow. The water flow enters the second plane cavity 22 of the second reflux cavity 17. Since the second plane cavity 22 is a plane, the water flow will accelerate and enter the second arc cavity 23. After the water flow hits the cavity wall of the second arc cavity 23, it will be decelerated and return to the entrance along the second arc cavity 23 to collide with the subsequent water flow, thereby preventing the inflow of part of the water flow and reducing the impact of the water flow. The part of the water flow that is not prevented will continue to flow into the first reflux cavity 6, and after being accelerated by the first plane cavity 20 of the first reflux cavity 6, it will hit the first arc cavity 21 and return to the entrance along the second arc cavity 23. The first arc-shaped cavity 21 returns again to collide with the subsequent water flow, further preventing the entry and impact of the water flow. Furthermore, multiple first circle steps 7, second circle steps 8 and third circle steps 9 are set on the rotating shaft, and multiple first circle cavities 12, second circle cavities 13 and third circle cavities 14 are also set in the sleeve. Multiple circles of the first reflux cavity 6 and the second reflux cavity 17 are also set accordingly. In this way, the water flow needs to pass through more reflux cavities to enter the gap, which lengthens the running distance of the water flow. The reverse flow resistance of several reflux cavities is repeatedly weakened, so that the flow rate and pressure of the water flow are reduced and decomposed, thereby reducing the water intake of the equipment.

[0065] Embodiment 2:

[0066] The basic content is the same as that of Example 1, except that:

[0067] The first plane cavity 20 is in a straight line with the outer slope of the second circle step 8; the second plane cavity 22 is in a straight line with the inner slope of the third circle cavity 14; the tangent angle of the connection point between the first arc cavity 21 and the outer slope of the first circle step 7 is greater than 90 degrees (preferably, the outlet of the arc cavity is arranged opposite to the water inlet, so that the water flow passing through the arc cavity directly collides with the incoming water flow after flowing out of the cavity); the tangent angle of the connection point between the second arc cavity 23 and the inner slope of the second circle cavity 13 is greater than 90 degrees (preferably, the outlet of the arc cavity is arranged opposite to the water inlet, so that the water flow passing through the arc cavity directly collides with the incoming water flow after flowing out of the cavity); the first arc cavity 21 extends upward to the middle of the outer surface of the first circle step 7; the second arc cavity 23 extends downward to the middle of the inner surface of the second circle cavity 13; the first reflux cavity 6 and the second reflux cavity 17 are staggered along the circumference (preferably, multiple circles of reflux cavities can be arranged, and the axial projections of the reflux cavities are staggered with each other), so that their width can cover the entire circumference in axial projection.

[0068] When in use, the first planar cavity 20 and the outer slope of the second circle step 8 are in a straight line, so that the incoming water flow can enter the first planar cavity 20 more smoothly, and then enter the first arc cavity 21, and the tangent angle of the connection point between the first arc cavity 21 and the outer slope of the first circle step 7 is greater than 90 degrees, which can ensure that the water flow can fully collide with the subsequent water flow after turning back, and stably exert the backflow resistance of the water flow; the width of the multiple circles of reflux cavity can cover the entire circumference in the axial projection, thereby ensuring that the water flow entering the gap space from the outside can be subject to the reflux resistance of at least one reflux cavity, thereby improving the effectiveness of the structure.

[0069] Embodiment 3:

[0070] The basic content is the same as that of Example 2, except that:

[0071] Both ends of the rotating shaft 1 are provided with key slots 5, and the external connecting piece is clamped on the key slots for rotation. The bottom plate 15 is fixedly connected to the sleeve body 16, and the bottom plate 15 is sealedly connected to the bulkhead 18;

[0072] Furthermore, the sealing connection is to weld the bottom plate 15 to the bulkhead 18;

[0073] The bottom plate 15 is provided with a plurality of through holes 11;

[0074] Furthermore, the sealing connection is that an elastic sealing member 19 is provided between the bottom plate 15 and the bulkhead 18 , and the bottom plate 15 , the elastic sealing member 19 (preferably an elastic rubber member) and the bulkhead 18 are pressed and sealed by bolts.

[0075] When in use, the bottom plate 15 and the bulkhead 18 are welded and sealed so that water can only enter through the gap between the rotating shaft 1 and the shaft sleeve 2, reducing the amount of water entering the interior of the cabin. The elastic seal 19 is sealed by bolts, which can achieve sealing while also having a certain degree of maintainability.

[0076] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A through-tank rotary sealing device, comprising a rotating shaft (1) and a shaft sleeve (2), characterized in that: The rotating shaft (1) comprises an inner shaft body (4) and an outer shaft body (10), and a first circle step (7), a second circle step (8) and a third circle step (9) are arranged in the area between the inner shaft body (4) and the outer shaft body (10); The first circle step (7), the second circle step (8) and the third circle step (9) are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle step (7), the second circle step (8) and the third circle step (9) are consistent; the diameters of the large diameter ends of the first circle step (7), the second circle step (8) and the third circle step (9) are consistent; The inner shaft body (4) is connected to the large diameter end of the first step (7), the small diameter end of the first step (7) is connected to the small diameter end of the second step (8), the large diameter end of the second step (8) is connected to the large diameter end of the third step (9), and the small diameter end of the third step (9) is connected to the outer shaft body (10); the diameters of the inner shaft body (4) and the outer shaft body (10) are consistent with the small diameter end of the first step (7); A plurality of first reflow chambers (6) are provided on the first step (7) along its circumference, and the first reflow chamber (6) comprises a first plane chamber (20) and a first arc-shaped chamber (21); One end of the first plane cavity (20) is located at the small diameter end of the first step (7), and the other end of the first plane cavity (20) extends downward to the left toward the inner shaft body (4); one end of the first arc-shaped cavity (21) is connected to the first plane cavity (20), and the other end of the first arc-shaped cavity (21) extends upward to the outer surface of the first step (7); The shaft sleeve (2) comprises a bottom plate (15) and a shaft sleeve body (16); the shaft sleeve body (16) is a hollow cylinder; a first circle cavity (12), a second circle cavity (13) and a third circle cavity (14) are formed in the shaft sleeve body (16); The first circle cavity (12), the second circle cavity (13) and the third circle cavity (14) are all pancake-shaped truncated cones; the diameters of the small diameter ends of the first circle cavity (12), the second circle cavity (13) and the third circle cavity (14) are consistent; the diameters of the large diameter ends of the first circle cavity (12), the second circle cavity (13) and the third circle cavity (14) are consistent; The bottom plate (15) is connected to the large diameter end of the first cavity (12), the small diameter end of the first cavity (12) is connected to the small diameter end of the second cavity (13), and the large diameter end of the second cavity (13) is connected to the large diameter end of the third cavity (14); A plurality of second reflow chambers (17) are provided on the second ring chamber (13) along its circumference, and the second reflow chamber (17) comprises a second plane chamber (22) and a second arc chamber (23); One end of the second plane cavity (22) is located at the large diameter end of the second circle cavity (13), and the other end of the second plane cavity (22) extends upward and leftward toward the bottom plate (15); one end of the second arc cavity (23) is connected to the second plane cavity (22), and the other end of the second arc cavity (23) extends downward to the inner surface of the second circle cavity (13); The rotating shaft (1) is inserted into the shaft sleeve (2); the first ring step (7) and the first ring cavity (12) match each other; the second ring step (8) and the second ring cavity (13) match each other; the third ring step (9) and the third ring cavity (14) match each other; the first reflux cavity (6) and the second reflux cavity (17) are connected to each other to form a Tesla valve-shaped cavity (3).

2. A through-tank rotary seal device according to claim 1, characterized in that: The first plane cavity (20) and the outer inclined surface of the second circle step (8) are on a straight line; the second plane cavity (22) and the inner inclined surface of the third circle cavity (14) are on a straight line.

3. A through-tank rotary seal device according to claim 2, characterized in that: The tangent angle of the connection point between the first arc-shaped cavity (21) and the outer inclined surface of the first circle step (7) is greater than 90 degrees; and the tangent angle of the connection point between the second arc-shaped cavity (23) and the inner inclined surface of the second circle cavity (13) is greater than 90 degrees.

4. A through-tank rotary seal device according to claim 1, 2 or 3, characterized in that: The first arc-shaped cavity (21) extends upward to the middle of the outer surface of the first circle step (7); and the second arc-shaped cavity (23) extends downward to the middle of the inner surface of the second circle cavity (13).

5. A through-tank rotary seal device according to claim 4, characterized in that: The first reflow chamber (6) and the second reflow chamber (17) are arranged in a staggered manner along the circumference, so that their widths can cover the entire circumference when projected in the axial direction.

6. A through-tank rotary seal device according to claim 5, characterized in that: Both ends of the rotating shaft (1) are provided with keyways (5).

7. A through-tank rotary seal device according to claim 6, characterized in that: The bottom plate (15) is fixedly connected to the shaft sleeve body (16), and the bottom plate (15) is sealingly connected to the bulkhead (18).

8. A through-tank rotary seal device according to claim 7, characterized in that: The sealed connection is achieved by welding the bottom plate (15) to the bulkhead (18).

9. The through-tank rotary seal device according to claim 7, characterized in that: The bottom plate (15) is provided with a plurality of through holes (11).

10. A through-tank rotary seal device according to claim 9, characterized in that: The sealed connection is that an elastic seal (19) is provided between the bottom plate (15) and the bulkhead (18), and the bottom plate (15), the elastic seal (19) and the bulkhead (18) are compressed and sealed by bolts.

Images