Supercritical carbon dioxide dry gas sealing and cooling device with small hole flow guiding function

Abstract

The invention belongs to the technical field of dry gas seal cooling, and discloses a supercritical carbon dioxide dry gas seal cooling device with small hole flow guide, which comprises a moving ring, a static ring, an inner shaft sleeve, a rotor, a static ring seat, a static ring push ring and a spring, the inner shaft sleeve is fixed on the rotor, the moving ring is fixed on the inner shaft sleeve, the static ring is installed on the inner shaft sleeve in a mode of being relatively matched with the moving ring, the static ring can axially float relative to the moving ring, the static ring pushing ring is arranged between the static ring and the static ring seat, the spring is arranged between the static ring pushing ring and the static ring, and the static ring pushing ring is attached to the static ring. The centers of the moving ring, the static ring, the inner shaft sleeve, the rotor, the static ring seat and the static ring push ring are located on the same central axis. The static ring seat and the static ring are provided with the static ring flow guide channels, low-temperature supercritical carbon dioxide flows into the static ring flow guide channels from the matched inlet connector, heat exchange is carried out on the static ring, the movable ring and the O-shaped rings, and therefore the good cooling effect is achieved, stable operation of the dry gas seal and a rotating piece is guaranteed, and the service life of the dry gas seal is prolonged. And the risks of instability and reliability reduction of sealing equipment are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of dry gas seal cooling, and in particular relates to a supercritical carbon dioxide dry gas seal cooling device with small hole flow guidance. Background Art

[0002] Supercritical carbon dioxide dry gas seal is a sealing device that uses supercritical carbon dioxide as a working fluid. It is mostly used as a shaft end seal in rotating mechanical equipment such as compressors and turbines. As the rotor speed increases, a sealing gas film will form between the dynamic ring and the static ring. The sealing gas film will separate the dynamic ring and the static ring, so that the dynamic ring and the static ring remain in a non-contact state during operation, reducing the degree of mechanical contact between the dynamic ring and the static ring, weakening the wear of the dynamic ring and the static ring, while ensuring the sealing effect, reducing energy loss and pollution caused by other lubricants. It will be more and more widely used in the future. Specifically, it has the following advantages:

[0003] High-efficiency sealing performance: Supercritical carbon dioxide dry gas seal uses supercritical carbon dioxide as the sealing medium, which can achieve a very low leakage rate and ensure the efficient operation of the system. Since supercritical carbon dioxide has special physical properties near the critical point, such as high density and low viscosity, the sealing performance is more stable and reliable.

[0004] Environmental protection and energy saving: Supercritical carbon dioxide is a non-toxic and non-flammable working fluid that is environmentally friendly and does not cause pollution.

[0005] Compared with other sealing methods, supercritical carbon dioxide dry gas sealing can significantly reduce energy consumption and improve energy utilization efficiency.

[0006] Strong adaptability: Dry gas seals are suitable for harsh working conditions such as high temperature, high pressure, and high speed, and can maintain stable sealing performance in these extreme environments. This sealing method also has good corrosion resistance and can be applied to a variety of media and working conditions.

[0007] Low maintenance cost: The supercritical carbon dioxide dry gas seal has a simple structure and is easy to install and maintain, which reduces maintenance costs.

[0008] Due to its long life and stability, the frequency of replacing seals is reduced, the leakage of working fluid in the system is reduced, and the operating cost is further cut.

[0009] Broad application prospects: Supercritical carbon dioxide Brayton cycle power generation technology has the advantages of high efficiency, cleanliness and compactness, and is an important development direction in the future energy field. Supercritical carbon dioxide dry gas seal, as one of the key components of this technology, has broad application prospects, especially in the fields of clean energy such as nuclear energy and solar energy.

[0010] However, during long-term high-speed rotation of the supercritical carbon dioxide dry gas seal, heat will gradually accumulate between the dynamic ring and the static ring. If it cannot be dissipated in time, it will heat the dynamic ring, the static ring and the surrounding O-rings, thereby reducing the performance of the dynamic ring, the static ring and the O-ring. In severe cases, the dynamic ring, the static ring and the O-ring will be severely deformed, affecting the continuous rotation of the dynamic ring and the static ring and the stable operation of the dry gas sealing device. The existing cooling device for supercritical carbon dioxide dry gas seals has a relatively complex structure and poor cooling effect.

[0011] Therefore, it is necessary to develop a non-contact sealing device that can dissipate the heat generated during the rotation process in time to avoid equipment damage caused by excessive temperature during actual operation and ensure the sealing effect. It is necessary to design a supercritical carbon dioxide dry gas sealing cooling device with small hole diversion. Summary of the invention

[0012] In order to solve the problems in the prior art that the cooling device for supercritical carbon dioxide dry gas seal is relatively complex in structure and has poor cooling effect, the present invention aims to provide a supercritical carbon dioxide dry gas seal cooling device with small hole diversion, which can dissipate the heat generated during the rotation process in time, ensure the stable operation of the dry gas seal and the rotating parts, and reduce the risk of instability of the sealing equipment and reduced reliability.

[0013] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0014] A supercritical carbon dioxide dry gas sealing cooling device with small hole flow diversion, comprising a dynamic ring, a static ring, an inner sleeve, a rotor, an O-ring, a static ring seat, a static ring push ring and a spring;

[0015] The inner sleeve is fixed on the rotor, the moving ring is fixed on the inner sleeve, the stationary ring is installed on the inner sleeve in a relatively matched manner with the moving ring, the stationary ring can float axially relative to the moving ring, a stationary ring push ring is arranged between the stationary ring and the stationary ring seat, a spring is arranged between the stationary ring push ring and the stationary ring, the stationary ring push ring fits with the stationary ring, and the centers of the moving ring, the stationary ring, the inner sleeve, the rotor, the stationary ring seat and the stationary ring push ring are located on the same central axis;

[0016] A cooling channel is provided on the stationary ring.

[0017] Furthermore, a guide channel is provided on the stationary ring seat, and the guide channel includes an inlet channel and an outlet channel. The inlet channel is arranged in the axial direction, and one is provided at each end of the top and bottom of the stationary ring seat. The outlet channel is connected to the inlet channel, arranged in the radial direction, and one is provided at each end of the top and bottom of the stationary ring seat.

[0018] Furthermore, a cooling channel is provided on the stationary ring, and the cooling channel includes a stationary ring inlet channel and a stationary ring guide channel. The stationary ring inlet channel is arranged in the radial direction, and one is arranged at each of the top and bottom ends of the stationary ring. The stationary ring guide channel is connected to the stationary ring inlet channel and is arranged in the circumferential direction.

[0019] Furthermore, the static ring guide channel is arranged in a circular ring or spiral shape.

[0020] Furthermore, when the static ring guide channels are arranged in a circular ring shape, the number of the circular guide channels is 1 to 4, and each group of guide channels is evenly arranged in the static ring guide area, and the channel axes are in the same plane.

[0021] Furthermore, when the static ring guide channel is arranged in a spiral shape, the number of spiral guide channels is 1 to 4, the outlet of each group of guide channels is the entrance of the next group of guide channels, the entrance channels connect all the guide channels, and the channel axes are in the same plane.

[0022] Furthermore, the inner diameter of the static ring is r si , the outer diameter of the static ring is r so , the minimum shaft diameter of the static ring guide channel>r si +0.4×(r so -r si ), the maximum shaft diameter of the static ring flow channel <r si +0.9×(r so -r si ).

[0023] Furthermore, the straight line where the axis of the static ring guide channel is located coincides with the straight line where the axis of the static ring is located, the cross-section of the static ring guide channel is circular, and the inner diameter of the static ring guide channel is 0.5-10 mm.

[0024] Furthermore, an inlet interface and an outlet interface are provided between the inner sleeve and the stationary ring seat, and the inlet interface is connected with the moving ring, the stationary ring end face and the stationary ring cooling channel.

[0025] Furthermore, a stationary ring O-ring is arranged at the stationary ring, and the stationary ring O-ring is squeezed by the stationary ring push ring and the stationary ring seat.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention discloses a supercritical carbon dioxide dry gas seal cooling device with small hole diversion. Different from the existing dry gas seal cooling system, a diversion channel is provided on the stationary ring. During the rotation of the dry gas seal, the supercritical carbon dioxide with a relatively low temperature flowing into the inlet interface is diverted to the inside of the stationary ring through the diversion channel to cool the stationary ring, thereby reducing the temperature of the sealing gas film and the O-rings around the dynamic and stationary rings. As the operating conditions such as the rotation speed change, the sealing end face gap can be adjusted autonomously by the spring between the stationary ring and the stationary ring seat. When the rotation speed is too large, the center of the axial flow guide channel of the stationary ring may not be strictly aligned with the center of the outlet channel of the stationary ring seat. At this time, the supercritical carbon dioxide with a relatively low temperature mainly enters the stationary ring through the stationary ring inlet channel. The supercritical carbon dioxide dry gas seal cooling device with small hole diversion of the present invention has a relatively simple structure, is convenient for later maintenance and disassembly, extends the service life of the equipment, and reduces the later maintenance costs.

[0028] Furthermore, in the present invention, a group of guide channels are respectively arranged at both ends of the top and bottom of the stationary ring seat to balance the impact force on the dry gas seal in the axial direction when the working medium flows in, thereby reducing the interference of the dry gas seal due to the cooling channel.

[0029] Furthermore, in the present invention, an inner sleeve O-ring is provided between the inner sleeve and the rotor to seal the leaked working fluid between the inner sleeve and the rotor. A moving ring O-ring is provided between the inner sleeve and the moving ring to prevent the working fluid from leaking to the inside of the moving ring. A stationary ring seat O-ring is provided outside the stationary ring seat to prevent the working fluid from leaking between the dry gas seal and the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic structural diagram of a supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to Example 1 of the present invention;

[0032] Figure 2 This is a structural cross-sectional view of a supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to Example 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the static ring structure of Example 1 of the present invention;

[0034] Figure 4 It is a cross-sectional view of the stationary ring AA of Example 1 of the present invention;

[0035] Figure 5 BB is a cross-sectional view of the stationary ring of Example 1 of the present invention;

[0036] Figure 6 Schematic diagram of the cross-sectional structure of the static ring of Example 2 of the present invention;

[0037] Figure 7 AA is a cross-sectional view of the stationary ring of Example 3 of the present invention;

[0038] Figure 8 It is a cross-sectional view of the stationary ring BB of Example 3 of the present invention.

[0039] In the figure, 1, moving ring; 2, stationary ring; 3, inner sleeve; 4, rotor; 5, O-ring; 6, stationary ring seat; 7, stationary ring push ring; 8, spring; 201, stationary ring inlet channel; 202, stationary ring guide channel; 301, inlet interface; 302, outlet interface; 501, moving ring O-ring; 502, inner sleeve O-ring; 503, stationary ring O-ring; 504, stationary ring seat O-ring; 601, stationary ring seat inlet guide channel; 602, stationary ring seat outlet guide channel. DETAILED DESCRIPTION

[0040] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0046] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0047] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0049] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] The inner diameter of the small hole in the present invention is 1.5 mm.

[0051] Example 1

[0052] like Figure 1 to Figure 5 As shown, a supercritical carbon dioxide dry gas sealing device with small hole diversion provided in this embodiment includes a dynamic ring 1, a static ring 2, an inner sleeve 3, a rotor 4, an O-ring 5, a static ring seat 6, a static ring push ring 7 and a spring 8. The O-ring 5 includes a dynamic ring O-ring 501, an inner sleeve O-ring 502, a static ring O-ring 503 and a static ring seat O-ring 504.

[0053] The inner sleeve 3 is fixed on the rotor 4, the dynamic ring 1 is fixed on the inner sleeve 3, the static ring 2 is installed on the inner sleeve 3 in a relatively matched manner with the dynamic ring 1, the static ring 2 can float axially relative to the dynamic ring 1, a spring 8 is arranged between the static ring push ring 7 and the static ring 2, the static ring push ring 7 is tightly fitted with the static ring 2 based on the action of the spring 8, the static ring O-ring 503 arranged at the static ring 2 is squeezed by the static ring push ring 7 and the static ring seat 6, and the centers of the dynamic ring 1, static ring 2, inner sleeve 3, rotor 4, static ring seat 6 and static ring push ring 7 are located on the same central axis.

[0054] In this embodiment 1, a small hole guide channel is arranged on the stationary ring seat 6, and the small hole guide channel includes a stationary ring seat inlet guide channel 601 and a stationary ring seat outlet guide channel 602. The stationary ring seat inlet guide channel 601 is arranged along the axial direction, and one is arranged at each of the top and bottom ends of the stationary ring seat 6. The stationary ring seat outlet guide channel 602 is connected to the stationary ring seat inlet guide channel 601, and is arranged along the radial direction, and one is arranged at each of the top and bottom ends of the stationary ring seat 6.

[0055] In this embodiment 1, a small hole cooling channel is provided on the stationary ring 2, and the small hole cooling channel includes a stationary ring inlet channel 201 and a stationary ring guide channel 202. The stationary ring inlet channel 201 is arranged in the radial direction, and one is arranged at each of the top and bottom ends of the stationary ring 2. The stationary ring guide channel 202 is connected to the stationary ring inlet channel 201 and is arranged in the circumferential direction.

[0056] The inner diameter of the stationary ring is r si , the outer diameter of the static ring is r so , the minimum shaft diameter of the static ring guide channel 202>r si +0.4×(r so -r si ), the maximum shaft diameter of the static ring guide channel 202 <r si +0.9×(r so -r si ).

[0057] The straight line where the axis of the static ring flow guide channel 202 is located coincides with the straight line where the axis of the static ring 2 is located. The cross section of the static ring flow guide channel 202 is circular, and the inner diameter of the static ring flow guide channel 202 is 0.5-10 mm.

[0058] Preferably, in this embodiment 1, the static ring guide channel 202 is arranged in a circular ring shape, the inner diameter of the static ring guide channel 202 is set to 1.5mm, the number of circular ring guide channels is set to 4, each group of guide channels is evenly arranged in the static ring guide area, the inner diameter of the static ring 2 is set to 60mm, and the outer diameter is set to 100mm. Preferably, the axial radii are 80mm, 85mm, 90mm, and 95mm respectively, and the axes of the guide channels are in the same plane.

[0059] In this embodiment 1, an inlet interface 301 and an outlet interface 302 are provided between the inner sleeve 3 and the stationary ring seat 6 , and the inlet interface 301 connects the dynamic ring 1 , the end surface of the stationary ring 2 and the small hole cooling channel of the stationary ring 2 .

[0060] In this embodiment 1, an inner sleeve O-ring 502 is provided between the inner sleeve 3 and the rotor 4 to seal the leaked working fluid between the inner sleeve 3 and the rotor 4. A dynamic ring O-ring 501 is provided between the inner sleeve 3 and the dynamic ring 1 to prevent the working fluid from leaking to the inside of the dynamic ring. A static ring seat O-ring 504 is provided outside the static ring seat 6 to prevent the working fluid from leaking between the dry gas seal and the outer shell.

[0061] Example 2

[0062] like Figure 6 As shown, this embodiment provides a supercritical carbon dioxide dry gas sealed cooling device with small hole diversion. Compared with embodiment 1, this embodiment 2 retains the annular guide channel, the inner diameter of the guide channel remains unchanged, and the number of the annular guide channels is 2.

[0063] Example 3

[0064] like Figure 7-Figure 8 As shown, this embodiment provides a supercritical carbon dioxide dry gas sealed cooling device with small hole diversion. Compared with embodiment 1, in this embodiment 3, the static ring diversion channel 202 is spiral, and the number of channels is 3.

[0065] The working process of the above-mentioned supercritical carbon dioxide dry gas seal cooling device with small hole diversion is as follows: a small hole diversion channel (i.e., a static ring seat inlet diversion channel 601 and a static ring seat outlet diversion channel 602) is provided on the static ring seat 6 and a static ring diversion channel 201 and a static ring diversion channel 202 are provided on the static ring 2, and the supercritical carbon dioxide flowing at low temperature at the inlet interface 301 flows into the static ring diversion channel 202, and heat is exchanged with the static ring 2, thereby cooling the dynamic ring 1 and each O-ring, thereby achieving a good cooling effect and ensuring the stable operation of the dry gas seal and the rotating parts. As the operating conditions such as the rotation speed change, the sealing end face gap can be adjusted autonomously by the spring between the static ring and the static ring seat. When the rotation speed is too large, the center of the axial diversion channel of the static ring may not be strictly aligned with the center of the static ring seat outlet channel. At this time, the supercritical carbon dioxide with a lower temperature mainly enters the static ring through the static ring inlet channel. The present invention has a simple structure and can be used to prevent the dry gas seal temperature from being too high, causing thermal deformation of the seal and thus damage, thereby reducing the risk of instability and reduced reliability of the sealing equipment.

[0066] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0067] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance, characterized in that: It comprises a moving ring (1), a stationary ring (2), an inner shaft sleeve (3), a rotor (4), a stationary ring seat (6), a stationary ring push ring (7) and a spring (8); The inner sleeve (3) is fixed on the rotor (4), the moving ring (1) is fixed on the inner sleeve (3), the stationary ring (2) is installed on the inner sleeve (3) in a manner of being relatively matched with the moving ring (1), the stationary ring (2) can float axially relative to the moving ring (1), a stationary ring push ring (7) is arranged between the stationary ring (2) and the stationary ring seat (6), a spring (8) is arranged between the stationary ring push ring (7) and the stationary ring (2), the stationary ring push ring (7) is fitted with the stationary ring (2), and the centers of the moving ring (1), the stationary ring (2), the inner sleeve (3), the rotor (4), the stationary ring seat (6) and the stationary ring push ring (7) are located on the same central axis; A cooling channel is provided on the stationary ring (2).

2. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 1 is characterized in that: A flow guide channel is provided on the stationary ring seat (6), and the flow guide channel includes a stationary ring seat inlet flow guide channel (601) and a stationary ring seat outlet flow guide channel (602). The stationary ring seat inlet flow guide channel (601) is arranged along the axial direction, and one is arranged at each of the top and bottom ends of the stationary ring seat (6). The stationary ring seat outlet flow guide channel (602) is connected to the stationary ring seat inlet flow guide channel (601), and is arranged along the radial direction, and one is arranged at each of the top and bottom ends of the stationary ring seat (6).

3. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 1 is characterized in that: The cooling channel comprises a stationary ring inlet channel (201) and a stationary ring guide channel (202); the stationary ring inlet channel (201) is arranged in a radial direction and one is provided at each of the top and bottom ends of the stationary ring (2); the stationary ring guide channel (202) is connected to the stationary ring inlet channel (201) and is arranged in a circumferential direction.

4. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 3 is characterized in that: The static ring flow guide channel (202) is arranged in a circular ring shape or a spiral shape.

5. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 4 is characterized in that: When the static ring flow guide channels (202) are arranged in a circular ring shape, the number of the circular ring flow guide channels is 1 to 4, and each group of flow guide channels is evenly arranged in the static ring flow guide area, and the channel axes are in the same plane.

6. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 4, characterized in that: When the static ring flow guide channels (202) are arranged in a spiral shape, the number of spiral flow guide channels is 1 to 4, the outlet of each group of flow guide channels is the inlet of the next group of flow guide channels, the inlet channels are connected to all the flow guide channels, and the channel axes are in the same plane.

7. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 4, characterized in that: The inner diameter of the static ring is r si , the outer diameter of the static ring is r so , the minimum shaft diameter of the static ring guide channel (202)>r si +0.4×(r so -r si ), the maximum shaft diameter of the static ring flow guide channel (202) <r si +0.9×(r so -r si ).

8. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 4, characterized in that: The straight line where the axis of the static ring flow guide channel (202) is located coincides with the straight line where the axis of the static ring (2) is located, the cross section of the static ring flow guide channel (202) is circular, and the inner diameter of the static ring flow guide channel (202) is 0.5-10 mm.

9. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 4, characterized in that: An inlet interface (301) and an outlet interface (302) are provided between the inner shaft sleeve (3) and the stationary ring seat (6), and the inlet interface (301) is connected to the moving ring (1), the end surface of the stationary ring (2) and the stationary ring cooling channel (202).

10. The supercritical carbon dioxide dry gas sealed cooling device with small hole flow guidance according to claim 1, characterized in that: A stationary ring O-ring (503) is arranged at the stationary ring (2), and the stationary ring O-ring (503) is squeezed by the stationary ring push ring (7) and the stationary ring seat (6).

Images