CN117685373A - Sealing component, mechanical equipment and compressed air energy storage system - Google Patents

Abstract

The invention discloses a sealing component, mechanical equipment and a compressed air energy storage system, and relates to the technical field of sealing. The sealing member includes at least one stage of a sealing assembly; each stage of sealing assembly comprises a first assembly and a second assembly, and relative rotation is arranged between the first assembly and the second assembly; the first component comprises a rotor and a disc body, and the center of the disc body is fixedly connected to the rotor; the second assembly includes an inner cavity having an opening in the center, the inner side of the inner cavity including a front wall, a top wall and a rear wall, the rotor being located at the opening, and the tray extending into the inner cavity from the opening. The mechanical equipment and the compressed air energy storage system disclosed by the invention comprise the sealing component. The invention solves the technical problem of poor sealing effect of the existing sealing component, mechanical equipment and compressed air energy storage system, and has the technical effect of good sealing effect.

Description

Sealing component, mechanical equipment and compressed air energy storage system

Technical Field

The invention relates to the technical field of sealing, in particular to a sealing component, mechanical equipment and a compressed air energy storage system.

Background

Almost all mechanical devices require the use of sealing members. In the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art:

the mechanical device comprises a rotor, i.e. a rotating part, on which a shaft and other parts rotating with the shaft are included, e.g. blades, impellers, etc. In mechanical equipment, dynamic sealing is needed between a rotor and a box body of the mechanical equipment, but most of dynamic sealing components have the problem of poor sealing effect at present, and particularly the problem of sealing leakage of large-scale mechanical equipment with pressure difference inside and outside the box body is always a problem to be solved urgently by those skilled in the art. At present, in order to solve the leakage problem at the sealing part, the person skilled in the art has to increase the maintenance times, reduce the continuous operation time of the mechanical equipment, or artificially shorten the service life of the sealing part, especially for large mechanical equipment with pressure difference inside and outside the box body, and the phenomenon is more obvious.

Based on the above, how to improve the sealing effect of the large-scale mechanical equipment, especially improve the sealing effect of the large-scale mechanical equipment with pressure difference between the inside and the outside of the box and relative rotation at the position to be sealed, is a technical problem to be solved by the person skilled in the art.

Disclosure of Invention

The invention aims to provide a sealing component with good sealing effect.

To this end, in a first aspect, a sealing member is provided for a mechanical device comprising a rotor comprising a central shaft; the sealing component comprises at least one stage of sealing assembly, each stage of sealing assembly comprises a first assembly and a second assembly, and relative rotation is realized between the first assembly and the second assembly; the first component comprises a disc body, and the center of the disc body is fixedly connected to the central shaft; the second component comprises an inner cavity with an opening at one side, and the inner side of the inner cavity comprises a front wall, a top wall and a rear wall; the tray body stretches into the inner cavity, the surface of the tray body facing the front wall is the front surface of the tray body, and the surface of the tray body facing the rear wall is the back surface of the tray body; a first gap is formed between the opening and the central shaft, a second gap is formed between the front surface of the tray body and the front wall, a third gap is formed between the tray body and the top wall, and a fourth gap is formed between the back surface of the tray body and the rear wall; the first gap, the third gap, and the fourth gap are all smaller than the second gap.

Further, the front wall is fixedly connected with at least two groups of first baffles; the first baffle is a strip-shaped plate, the first baffle is in a cantilever structure on the front wall, one side of the first baffle is fixed with the front wall, a fifth gap is reserved between the other side of the first baffle and the tray body, one end of the first baffle is fixed with the top wall, and the other end of the first baffle is arranged in the plate surface of the front wall. Further, the first baffle is a curved plate.

Further, the arc centers of all the first baffles are on the same side.

Further, the first baffle is a planar plate.

Further, the outer contour of the side, close to the disc body, of the first baffle plate is a straight line or a curve.

Further, all of the first baffles are arranged in an annular array about the central axis.

Further, at least one group of second baffles are arranged on the first baffle, the second baffles are of a cantilever structure, and the second baffles are arranged in a crossing way with the first baffles; one end of the second baffle is close to the front wall, and the other end of the second baffle is close to the tray body; the second baffle is positioned in the plate surface of the first baffle.

Further, at least one group of the second baffles is arranged at intervals in the extending direction along the first baffle.

Further, one end of the second baffle is connected with the front wall.

Further, the front surface of the tray body is a plane or a curved surface; and/or the back surface of the tray body is a plane or a curved surface.

Further, the thickness of the tray body near the central axis is greater than the thickness of the tray body far from the central axis.

Further, at least two stages of the seal assemblies are arranged side by side in sequence.

Further, the size of the seal assembly of one stage is smaller than the size of the seal assembly of the other stage.

In a second aspect, there is provided a seal member for a mechanical device comprising a rotor having a working member thereon; the sealing member comprises a sleeve and at least two stages of sealing assemblies; each stage of the sealing assembly comprises a first assembly and a second assembly, and relative rotation is arranged between the first assembly and the second assembly; the first component comprises a disc body, the center of the disc body is fixedly connected to the outer side of the sleeve, and the working part is fixed to the inner side of the sleeve; the second component comprises an inner cavity with an opening at one side, and the inner side of the inner cavity comprises a front wall, a top wall and a rear wall; the tray body stretches into the inner cavity, the surface of the tray body facing the front wall is the front surface of the tray body, and the surface of the tray body facing the rear wall is the back surface of the tray body; a first gap is formed between the opening and the sleeve, a second gap is formed between the front surface of the tray body and the front wall, a third gap is formed between the tray body and the top wall, and a fourth gap is formed between the back surface of the tray body and the rear wall; the first gap, the third gap, and the fourth gap are all smaller than the second gap.

In a third aspect, there is provided a mechanical device comprising an impeller shaft and the sealing member of any one of the first aspects; the sealing component is used for sealing the shaft end of the impeller shaft.

In a fourth aspect, there is provided a compressed air energy storage system comprising an axial flow impeller apparatus comprising a vane shaft and the sealing member of any of the first aspects; the sealing member is provided at the shaft end of the vane shaft.

In a fifth aspect, there is provided a compressed air energy storage system comprising an axial flow impeller apparatus comprising a casing, a vane shaft and the sealing member of any of the second aspects; the blade shaft comprises a moving blade, and the inner side of the sleeve is connected with the edge of the moving blade; the outer side of the top wall is fixed with the box body.

Further, the blade shaft includes a blade; the size from the root of the disk body to the edge of the disk body is not less than 1/3 of the size of the blade.

One of the above technical solutions has the following advantages or beneficial effects:

the seal member of the first aspect is for a machine comprising a rotor which is a rotating member comprising a central shaft and working parts on the shaft, such as blades, impellers, etc. The seal assembly includes at least one stage of seal assembly, each stage of seal assembly including a first assembly and a second assembly with relative rotation therebetween. The first component and the second component are structured and assembled by the following steps: the first assembly comprises a disc body, and when the disc is used, the center of the disc body is fixedly connected to the central shaft of the rotor. The second assembly comprises an inner cavity with an opening at one side, the inner side of the inner cavity comprises a front wall, a top wall and a rear wall, when the sealing component is used, the disc body of the sealing component stretches into the inner cavity, the surface of the disc body, facing the front wall, is the front surface of the disc body, and the surface of the disc body, facing the rear wall, is the back surface of the disc body. After the first component and the second component are assembled, a first gap is reserved between an opening of the second component and a central shaft of the rotor, a second gap is reserved between the front surface of a tray body of the first component and the front wall of the second component, a third gap is reserved between the tray body and the top wall, a fourth gap is reserved between the back surface of the tray body and the rear wall, and after the first gap, the third gap and the fourth gap are smaller than the second gap.

Because the inside of the mechanical equipment containing the rotor is a high-pressure side, the inside and the outside have pressure differences, fluid in the equipment has a leakage trend under the pushing of the pressure differences, the pressure differences are the pushing force of the internal leakage fluid, and the leakage direction of the internal leakage fluid in the sealing component under the action of the pushing force is as follows: from the first gap to the second gap, to the third gap, to the fourth gap, and then into the next stage seal assembly, the leakage direction in the next stage seal assembly is also the first gap→the second gap→the third gap→the fourth gap. And then, taking the infinitesimal of the leaked fluid as a research object, analyzing the stress of the infinitesimal of the leaked fluid, and explaining the sealing principle of the sealing assembly of the scheme.

The leakage fluid on the surface of the tray body moves along with the tray body to form a laminar layer on the tray body due to the viscosity of the leakage fluid, but the thickness of the laminar layer is limited, and the leakage fluid exceeding the thickness of the laminar layer is all a free layer. In the above-described leakage direction, since the second gap is larger than the fourth gap, most of leakage fluid in the second gap is concentrated in the free layer, and most of leakage fluid in the fourth gap is in the laminar layer. The leakage fluid infinitesimal at the free layer is not influenced by the circumferential speed of the disc body, and the leakage fluid infinitesimal at the laminar layer moves together with the disc body and has the same circumferential speed as the disc body. Therefore, in the second gap, the leakage fluid micro-element is only subjected to the thrust caused by the pressure difference between the inside and the outside of the mechanical equipment from the radial direction to the outside, in the fourth gap, besides the thrust caused by the pressure difference between the inside and the outside of the mechanical equipment from the radial direction to the inside, the leakage fluid micro-element is also subjected to the inertial centrifugal force in the process of rotating along with the disc body, and the direction of the inertial centrifugal force is radial from the inside to the outside because the disc body is a rotating piece relative to the second component, so that in the fourth gap, the thrust born by the leakage fluid micro-element is opposite to the direction of the inertial centrifugal force born by the leakage fluid micro-element, thereby inhibiting the leakage fluid from entering the next-stage sealing component and playing a role in preventing fluid leakage. With the increase of the number of stages of the sealing assembly, in a later sealing assembly of a certain stage, the inertial centrifugal force suffered by the leakage fluid is equal to the pushing force of the leakage fluid, so that no leakage can be realized, and the sealing effect of the sealing component is realized. With the radial dimension of the sealing assembly being increased, the inertial centrifugal force borne by the leakage fluid micro-element is larger, the flowing resistance of the leakage fluid micro-element is larger, leakage is easier to be prevented when the sealing level is smaller, and even reverse leakage can be generated, namely, the external low-pressure side gas is pumped into the sealed high-pressure side by the strong rotating centrifugal force generated by sealing rotation. Further, if the dimensions of the first gap and the third gap are controlled, the cross-sectional area of the leakage path can be further reduced, thereby suppressing leakage.

The other technical scheme has the following advantages or beneficial effects: the seal member of the second aspect is also useful in a machine comprising a rotor which is a rotating member including a central shaft and working parts on the shaft such as blades, impellers, etc. The second type of seal member is disposed on the working member and includes a sleeve and at least two seal assemblies, each seal assembly including a first assembly and a second assembly having relative rotation therebetween. When in assembly, the first component comprises a disc body, the center of the disc body is fixedly connected to the outer side of the sleeve, and the working part is fixed to the inner side of the sleeve. The second assembly of the second seal member is identical in construction to the first seal member. The sealing principle of the second sealing member is the same as that of the first sealing member. Based on this, the two sealing members seal by using the viscous resistance of the fluid when moving in a narrow space and the inertial centrifugal force of the fluid when rotating, and have a technical effect of good sealing effect.

The other technical scheme has the following advantages or beneficial effects: the sealing of the mechanical device of the third aspect and the compressed air energy storage system of the fourth aspect and the compressed air energy storage system of the fifth aspect also have the technical problem of good sealing effect due to the use of the two sealing assemblies, and as the radial size of the sealing assemblies increases, especially in the device with larger compression ratio of the fourth aspect and the fifth aspect, the sealing effect of the solution is better, and as the first assembly and the second assembly are not contacted, that is, no component wear exists, the maintenance frequency of the mechanical device and the compressed air energy storage system is reduced, and the continuous operation time is improved.

Drawings

FIG. 1 is a cross-sectional view of a seal member in a first embodiment;

FIG. 2 is a view in the A-A direction of FIG. 1;

FIG. 3 is a partial perspective view of a first component of the first embodiment;

FIG. 4 is a partial perspective view of a second component of the first embodiment;

FIG. 5 is a cross-sectional perspective view of an assembly of a first component and a second component in the first embodiment;

FIG. 6 is a schematic diagram of the first and second embodiments;

FIG. 7 is a further seal member of the first embodiment;

FIG. 8 is a further embodiment of a seal member;

FIG. 9 is a fourth seal member of the first embodiment;

FIG. 10 is a fifth seal member of the first embodiment;

FIG. 11 is a sixth seal member in the first embodiment;

fig. 12 is a seventh seal member in the first embodiment;

FIG. 13 is a view in the A-A direction of FIG. 12;

FIG. 14 is a cross-sectional view of a seal member in the second embodiment;

fig. 15 is an assembly schematic view of the seal member on the axial flow impeller device in the second embodiment.

In the figure: 100-a seal assembly; 110-a first component; 112-a tray; 200-rotor; 210-a central axis; 220-moving blades; 230-stationary blades; 120-a second component; 121-a first baffle; 122-a second baffle; 123-front wall; 124-top wall; 125-a rear wall; 126-lumen; 127-housing; 130-a sleeve; 300-box body.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Embodiment one:

as shown in fig. 1-6, the present embodiment provides a seal member for a machine including a rotor, the rotor 200 including a central shaft 210. The seal assembly includes at least one stage of seal assemblies 100, each stage of seal assembly 100 including a first assembly 110 and a second assembly 120, with relative rotation between the first assembly 110 and the second assembly 120. In the sealing member of the present embodiment, for example, the shaft end sealing is used, the first component 110 of the sealing member is fixed to the rotor, so that the first component 110 rotates together with the rotor, and the second component 120 of the sealing member is fixed to the case, so that the second component 120 is a stationary component with respect to the case. The first assembly 110 includes a disc 112 having a center fixedly coupled to a central shaft 210 of the rotor. The second component 120 includes an interior cavity 126, the interior side of the interior cavity 126 including a front wall 123, a top wall 124, and a rear wall 125. When assembled, the tray 112 extends into the cavity 126, the front side of the tray facing the front wall being the front side of the tray, and the rear side of the tray facing the rear wall being the rear side of the tray. After the first component and the second component are assembled, a first gap is reserved between an opening of the second component and a central shaft of the rotor, a second gap is reserved between the front surface of a tray body of the first component and the front wall of the second component, a third gap is reserved between the tray body and the top wall, a fourth gap is reserved between the back surface of the tray body and the rear wall, and after the first gap, the third gap and the fourth gap are smaller than the second gap.

As shown in fig. 6, since the inside of the mechanical device including the rotor is a high pressure side, there is a pressure difference between the inside and the outside, and fluid in the device tends to leak under the pushing of the pressure difference, the pressure difference is the pushing force of the internal leakage fluid, and the leakage direction of the internal leakage fluid in the sealing member under the pushing force is: from the first gap (1) to the second gap (2), to the third gap (3), to the fourth gap (4) of the first stage seal assembly, and then into the next stage seal assembly, the leakage direction in the next stage seal assembly is also the first gap (1) →the second gap (2) →the third gap (3) →the fourth gap (4). Next, taking the micro-element dL of the leakage fluid as a research object, analyzing the stress of the micro-element dL of the leakage fluid, and explaining the sealing principle of the sealing component of the scheme.

The micro-element dL of the leakage fluid on the surface of the tray body moves along with the tray body to form a laminar layer on the tray body due to the viscosity of the leakage fluid, but the thickness of the laminar layer is limited, and the leakage fluid exceeding the thickness of the laminar layer is all a free layer. In the above-described leakage direction, since the second gap is larger than the fourth gap, most of the leakage fluid microcells dL are concentrated in the free layer in the second gap, and most of the leakage fluid is in the laminar layer in the fourth gap. The leakage fluid micro-element dL in the free layer is not affected by the circumferential velocity of the disc, while the leakage fluid micro-element dL in the laminar layer moves together with the disc and has the same circumferential velocity as the disc. Therefore, the leakage fluid micro-element dL is only subjected to the thrust force F1 caused by the pressure difference between the inside and the outside of the mechanical equipment from the inside to the outside in the radial direction in the second gap, and in the fourth gap, the leakage fluid micro-element dL is subjected to the thrust force F2 caused by the pressure difference between the inside and the outside of the mechanical equipment from the outside to the inside in the radial direction in addition to the thrust force F2 caused by the pressure difference between the inside and the outside of the mechanical equipment from the outside in the radial direction in the process of rotating along with the disc body, and is also subjected to the inertial centrifugal force F3 in the radial direction from the inside to the outside in the radial direction in the second gap, so that the thrust force F2 to which the leakage fluid micro-element dL is subjected is opposite to the inertial centrifugal force F3 to which the leakage fluid enters the next-stage sealing assembly is restrained, and the effect of preventing the leakage of the fluid is achieved. With the increase of the number of stages of the sealing assembly, in a later sealing assembly of a certain stage, the inertial centrifugal force suffered by the leakage fluid is equal to the pushing force of the leakage fluid, so that no leakage can be realized, and the sealing effect of the sealing component is realized. When the radial size of the sealing assembly is increased, the inertial centrifugal force born by the leakage fluid micro-element is larger, the flow resistance of the leakage fluid micro-element is larger at the moment, the leakage is prevented more easily when the sealing stage number is smaller, and even reverse leakage can be generated, namely, the external low-pressure side gas enters the sealed high-pressure side, so that the sealing effect is ensured. Further, if the dimensions of the first gap (1) and the third gap (3) are controlled, the cross-sectional area of the leakage path can be further reduced, thereby suppressing leakage.

Further, the size of the third gap (3) is not larger than 1mm, and/or the size of the fourth gap (4) is not larger than 1mm, so that under most working conditions, the sealing performance of the size is better, and the specific size needs to be designed according to the actual working condition requirements.

Further, as shown in fig. 4 to 5, the sealing member further includes a housing 127, and when the sealing member includes two or more stages of sealing assemblies, the second assemblies of all the sealing assemblies are connected as a single body by the housing 127.

Further, as shown in fig. 1 and fig. 4-6, at least two groups of first baffles 121 are fixedly connected to the front wall 123 of the second assembly; the first baffle 121 is in a cantilever structure, the first baffle 121 is a strip-shaped plate, the width of the strip-shaped plate is smaller than the distance between the front wall and the rear wall, one end of the first baffle is fixed with the top wall, one side of the first baffle 121 is fixed with the front wall 123, a fifth gap (5) is arranged between the other side of the first baffle 121 and the disc body 112, and the other end of the first baffle is arranged in the plate surface of the front wall of the second assembly. Most of the leakage fluid micro-cells dL in the second gap (2) are concentrated in the free layer, the leakage fluid micro-cells dL at the free layer is hardly influenced by the circumferential speed of the disc 112, and further, in order to ensure that the leakage fluid micro-cells dL in the second gap (2) are not influenced by the circumferential speed of the disc 112 at all, a first baffle plate 121 is arranged on the front wall 123 of the second assembly for inhibiting the circumferential flow of the leakage fluid in the second gap (2). In addition, the first baffle 121 also has the effect of increasing the rigidity of the second assembly on the second assembly.

Further, at least two groups of first baffles 121 are arranged on the front wall 123, and the number of the first baffles 121 is determined according to the working condition and the sealing condition of the position to be sealed.

Further, as shown in fig. 7 to 8, the arrow indicates the rotation direction of the rotor, and the first barrier 121 is a curved plate. The curved plate may be a curved surface which can be formulated, for example, a primary curved surface, a secondary curved surface, a tertiary curved surface, or a curved surface which cannot be formulated, for example, a curved surface which is fitted after a fluid test.

Further, as shown in fig. 7, when there is one arc center of the first baffles 121, the arc centers of all the first baffles 121 are on the same side, and all the first baffles 121 are in a vortex shape as seen from A-A.

Further, as shown in fig. 8 and 2, the arrow indicates the rotation direction of the rotor, and the first baffle 121 is a flat plate, i.e., a flat plate. The first baffle 121 has a cantilever structure, one end of the first baffle 121 is fixed to the front wall 123, one side of the first baffle 121 is fixed to the housing 127, and on the premise that a fifth gap (5) is formed between one end of the first baffle and the disc 112, both the first baffle and the curved plate can inhibit the circumferential flow of the fluid in the second gap (2), and the rigidity of the second assembly can be improved.

Further, as shown in fig. 9, 10 and 6, the outer contour of the side of the first baffle 121 near the tray 112 is a straight line or a curved line. Fig. 6 shows an embodiment in which the outer contour of the side of the first barrier 121 near the tray 112 is a straight line, fig. 9 and 10 show an embodiment in which the outer contour of the end of the first barrier 121 near the tray 112 is a curved line, wherein fig. 9 shows an embodiment in which the outer contour of the end of the first barrier 121 near the tray 112 is a convex curve, and fig. 10 shows an embodiment in which the outer contour of the end of the first barrier 121 near the tray 112 is a concave curve.

Further, as shown in fig. 1-5, all of the first baffles 121 are arranged around the rotor annular array. The arrangement of the annular array arrangement may be radial, as in fig. 2, with the first baffles being radially arranged. The annular array arrangement of first baffles may also be as shown in fig. 8, each arranged at an angle to the radial direction.

Further, as shown in fig. 11, at least one group of second baffles 122 is disposed on the first baffle 121, the second baffles 122 are in a cantilever structure, and the second baffles 122 are arranged to intersect the first baffle 121; one end of the second baffle 122 is close to the front wall 123, the other end is close to the tray 112, and the second baffle is located in the plate surface of the first baffle. The second baffle 122 serves to inhibit radial flow of fluid within the second gap (2), increasing the flow resistance of the leakage fluid. Further, providing the second barrier 122 on the first barrier 121 can increase the rigidity of the first barrier 121, and thus can also increase the rigidity of the second assembly.

Further, as shown in fig. 11, at least one set of the second baffles 122 are disposed at intervals in the extending direction along the first baffles 121.

Further, as shown in fig. 11, one end of the second baffle 122 is connected to the front wall 123.

Further, the front surface of the tray body is a plane or a curved surface; and/or the back surface of the tray body is a plane or a curved surface. Fig. 6 shows an embodiment in which the front surface of the tray body is curved, the front side line of the section of the tray body is straight, and the back surface of the tray body is planar. Fig. 9 shows an embodiment in which the front surface of the tray body is curved, the front side line of the section of the tray body is curved, and the back surface of the tray body is planar. Fig. 10 shows an embodiment in which the front surface of the tray body is curved, the front side line of the cross section of the tray body is curved, the back surface of the tray body is curved, and the back side line of the cross section of the tray body is curved. The shapes of the front surface of the tray body and the back surface of the tray body can be respectively combined into new embodiments.

Further, as shown in fig. 1, 3, 6, and 9-11, the thickness of the disc 112 near the rotor is greater than the thickness of the disc 112 far from the rotor. Of course, the thickness of the disc body from the position close to the rotor to the position far from the rotor is consistent, and the processing is convenient.

Further, as shown in fig. 1-11, at least two stages of the seal assemblies 100 are arranged side by side in sequence. Fig. 1-11 illustrate embodiments in which at least two of the seal assemblies 100 are identical in size to adjacent two-stage seal assemblies 100. Further, the seal assemblies 100 of two adjacent stages as shown in fig. 12-13 are different in size, wherein the size of one stage of seal assembly is smaller than the size of the other stage of seal assembly, and the size of the seal assembly includes the size of the first assembly and the size of the second assembly, and the sizes of the first gap, the second gap, the third gap, and the fourth gap formed by the first assembly and the second assembly.

Further, the seal assembly 100 near the sealed high pressure side of the fluid device is smaller in size and the seal assembly 100 near the outside of the fluid device is larger in size. The larger the size of the seal assembly 100, the lower its stiffness, but the larger the size of the seal assembly 100, the better the sealing performance, due to the higher pressure on the sealed high pressure side of the fluid device. Therefore, the seal assembly 100 near the sealed high pressure side of the fluid device is smaller in size, and the seal assembly 100 near the outside of the fluid device is larger in size, which has the advantages of reducing deformation of the seal assembly and ensuring sealability of the seal assembly.

The present embodiment also provides a mechanical device comprising an impeller shaft and any of the sealing members described above for shaft end sealing of the impeller shaft.

Further, for convenience of assembly, the second assembly of the present embodiment may be divided into two pieces, and fig. 4 shows a structure of one of the second assemblies. During assembly, a central hole matched with the size of the rotor to be assembled is machined in the center of the disc body, and then the disc body is fixedly connected with the rotor, so that the first assembly is installed. Then, one of the second components is fixed with the upper box body, the other second component is fixed with the lower box body, and the second components are installed after the two parts of box bodies are combined. Of course, the second component may be machined to more than two pieces for reassembly as desired. When the sealing member includes the housing 127, the housing is also divided into an upper case and a lower case, which are respectively fixed to the case where sealing is to be performed. The box to be sealed is also divided into an upper box and a lower box, wherein the outer side of the upper shell is fixed with the upper box, and the outer side of the lower shell is fixed with the lower box.

The mechanical device of the embodiment includes an impeller shaft, which may be a rotating fluid device, where the rotating fluid device is a device that applies work to or by fluid, that is, a mechanical device that applies work to fluid by rotating an impeller, or applies work to outside by pushing the impeller to rotate by fluid. In the mechanical equipment, the impeller shaft and the box body move mutually and have gaps, and the sealing part is used for sealing the impeller shaft and the box body, so that the leakage of fluid in the box body can be effectively prevented, the maintenance cost is low, and the service life is long.

Embodiment two:

as shown in fig. 14-15, the present embodiment provides a sealing component 100, and the same technical scheme is not repeated. The sealing component of the embodiment is used for mechanical equipment with a rotor, the rotor is provided with a working component, and the sealing component of the embodiment is used for interstage sealing between two stages of working components. The seal member comprises a sleeve 130 and at least one stage of seal assembly, each stage of seal assembly comprising a first assembly and a second assembly with relative rotation therebetween; the first assembly includes a disc 112, a center of the disc 112 is fixedly connected to an outer side of the sleeve 130, and a working member is fixed to an inner side of the sleeve. The second component comprises an inner cavity with an opening on one side, the inner side of the cavity comprising a front wall 123, a top wall 124 and a rear wall 125. When the tray body is assembled, the tray body stretches into the inner cavity, the surface of the tray body facing the front wall is the front surface of the tray body, and the surface of the tray body facing the rear wall is the back surface of the tray body. A first gap is formed between the opening of the second assembly and the sleeve, a second gap is formed between the front surface of the tray body and the front wall, a third gap is formed between the tray body and the top wall, and a fourth gap is formed between the back surface of the tray body and the rear wall; the first gap, the third gap and the fourth gap are smaller than the second gap. The sealing principle of the sealing member of the present embodiment is the same as that of the first embodiment. The seal member of this embodiment is used for interstage sealing and, in contrast to the implementation, the seal member is provided with a sleeve for nesting over the working member of the rotor, providing a basis for the mounting of the disks of at least one set of first assemblies. The sleeve is connected with the root of the first component, the rotor, the moving blades, the sleeve and all the first components rotate along with the central shaft, and the second component is fixedly connected with the box body.

Further, in the sealing member of the present embodiment, at least two sets of first baffles 121 are also fixedly connected to the front wall of the second assembly; the first baffle is cantilever structure, and the one end and the roof of first baffle are fixed, and one side and the front wall of first baffle are fixed, have the fifth clearance between opposite side and the disk body.

Embodiment III:

the embodiment provides a compressed air energy storage system, which is used for an electric power energy storage technology. The axial flow impeller device in the compressed air energy storage system belongs to large-scale equipment and mainly comprises a compressor and an expander, namely an axial flow compressor and an axial flow expander, and in the large-scale compressed air energy storage system, more than one axial flow compressor and more than one axial flow expander are arranged, and each axial flow compressor or each axial flow expander is provided with multiple stages. The seals in the axial compressor or the axial expander are interstage seals and shaft end seals.

The shaft end sealing structure is as follows: the axial flow impeller device comprising a blade shaft and the sealing member of any one of the first embodiments, the sealing member being disposed at an axial end of the blade shaft, the first assembly being fixedly connected to the axial end of the blade shaft, the second assembly being fixedly connected to the casing of the axial flow impeller device. The sealing component is used for shaft end sealing.

As shown in fig. 15, the structure of the inter-stage seal is: the axial flow impeller apparatus comprising a casing, a vane shaft, and the seal member of any one of the second embodiments; the blade shaft includes moving blades 220 to the edges of which the inner side of the sleeve 130 is coupled; the outer side of the top wall is fixed with the box body. The blade shaft of the axial flow impeller apparatus further includes stationary blades 230, and the stationary blades 230 are connected to the casing. The sealing of the compressed air energy storage system has the technical problem of good sealing effect due to the use of the two sealing assemblies of the first embodiment and/or the second embodiment, thereby reducing the overhaul frequency of mechanical equipment and the compressed air energy storage system and improving the continuous operation time.

Further, the types of the impeller devices are different, the blade shaft of the impeller device includes blades including moving blades and stationary blades, and one preferable size of the seal member is designed as follows: the size from the root of the disk body to the edge of the disk body is not less than 1/3 of the size of the blade. In addition, the size of the third gap (3) and/or the fourth gap (4) is not more than 1mm, and the sealing component with the size design can be suitable for most large impeller equipment, and has the advantage of sealing effect. Of course, the specific size needs to be designed according to the actual working condition requirement.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. It will be apparent that the described embodiments are merely some, but not all, embodiments of the invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (20)

1. A seal member for a mechanical device comprising a rotor, the rotor comprising a central shaft;

the sealing component comprises at least one stage of sealing assembly, each stage of sealing assembly comprises a first assembly and a second assembly, and relative rotation is realized between the first assembly and the second assembly;

the first component comprises a disc body, and the center of the disc body is fixedly connected to the central shaft; the second component comprises an inner cavity with an opening at one side, and the inner side of the inner cavity comprises a front wall, a top wall and a rear wall; the tray body stretches into the inner cavity, the surface of the tray body facing the front wall is the front surface of the tray body, and the surface of the tray body facing the rear wall is the back surface of the tray body; a first gap is formed between the opening and the central shaft, a second gap is formed between the front surface of the tray body and the front wall, a third gap is formed between the tray body and the top wall, and a fourth gap is formed between the back surface of the tray body and the rear wall; the first gap, the third gap, and the fourth gap are all smaller than the second gap.

2. The sealing member according to claim 1, wherein the front wall has at least two sets of first baffles fixedly attached thereto; the first baffle is a strip-shaped plate, the first baffle is in a cantilever structure on the front wall, one side of the first baffle is fixed with the front wall, a fifth gap is reserved between the other side of the first baffle and the tray body, one end of the first baffle is fixed with the top wall, and the other end of the first baffle is arranged in the plate surface of the front wall.

3. The seal of claim 2 wherein said first baffle is a curved panel.

4. A seal according to claim 3, wherein the arc centers of all of the first baffles are on the same side.

5. The seal member of claim 2, wherein the first baffle is a planar plate.

6. The seal member of claim 2, wherein an outer contour of a side of the first barrier adjacent to the disc is linear or curvilinear.

7. The seal of claim 2 wherein all of said first baffles are arranged in an annular array about said central axis.

8. The seal of claim 2, wherein at least one set of second baffles is provided on the first baffle, the second baffles being of cantilevered construction, the second baffles being disposed crosswise to the first baffles; one end of the second baffle is close to the front wall, and the other end of the second baffle is close to the tray body; the second baffle is positioned in the plate surface of the first baffle.

9. The seal of claim 8 wherein at least one set of said second baffles are spaced apart along the extension of said first baffle.

10. The seal of claim 8 wherein one end of the second baffle is connected to the front wall.

11. The sealing member according to claim 1, wherein the front surface of the disc body is a flat surface or a curved surface; and/or the back surface of the tray body is a plane or a curved surface.

12. The seal of claim 1 wherein the thickness of the disc proximate the central axis is greater than the thickness of the disc distal from the central axis.

13. The seal of claim 1 wherein at least two of said seal assemblies are arranged side-by-side in sequence.

14. The seal of claim 13 wherein the seal assembly of one stage has a smaller size than the seal assembly of another stage.

15. A sealing member for a machine comprising a rotor having a working member thereon;

the sealing member comprises a sleeve and at least two stages of sealing assemblies; each stage of the sealing assembly comprises a first assembly and a second assembly, and relative rotation is arranged between the first assembly and the second assembly;

the first component comprises a disc body, the center of the disc body is fixedly connected to the outer side of the sleeve, and the working part is fixed to the inner side of the sleeve;

the second component comprises an inner cavity with an opening at one side, and the inner side of the inner cavity comprises a front wall, a top wall and a rear wall; the tray body stretches into the inner cavity, the surface of the tray body facing the front wall is the front surface of the tray body, and the surface of the tray body facing the rear wall is the back surface of the tray body;

a first gap is formed between the opening and the sleeve, a second gap is formed between the front surface of the tray body and the front wall, a third gap is formed between the tray body and the top wall, and a fourth gap is formed between the back surface of the tray body and the rear wall; the first gap, the third gap, and the fourth gap are all smaller than the second gap.

16. The seal of claim 15, wherein the front wall has at least two sets of first baffles fixedly attached thereto; the first baffle is a strip-shaped plate, the first baffle is in a cantilever structure on the front wall, one side of the first baffle is fixed with the front wall, a fifth gap is reserved between the other side of the first baffle and the tray body, one end of the first baffle is fixed with the top wall, and the other end of the first baffle is arranged in the plate surface of the front wall.

17. A mechanical device comprising an impeller shaft and the sealing member of any one of claims 1 to 14; the sealing component is used for sealing the shaft end of the impeller shaft.

18. A compressed air energy storage system comprising an axial flow impeller apparatus comprising a vane shaft and the sealing member of any one of claims 1-14; the sealing member is provided at the shaft end of the vane shaft.

19. A compressed air energy storage system comprising an axial flow impeller apparatus comprising a housing, a vane shaft, and the sealing member of any of claims 15-16; the blade shaft comprises a moving blade, and the inner side of the sleeve is connected with the edge of the moving blade; the outer side of the top wall is fixed with the box body.

20. A compressed air energy storage system according to claim 18 or 19, wherein the blade shaft comprises a blade; the size from the root of the disk body to the edge of the disk body is not less than 1/3 of the size of the blade.