Sealing structure and carbon dioxide centrifugal compressor
By setting up an airflow channel in the carbon dioxide centrifugal compressor to regulate the temperature and pressure of the sealing gap, the problem of carbon dioxide phase transformation within the sealing gap is solved, improving the reliability of the sealing structure and the service life of the compressor, and balancing the axial thrust.
Patent Information
- Application Number
- CN202422066096.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-08-23
AI Technical Summary
Carbon dioxide is prone to phase transformation in the sealing gaps of a carbon dioxide centrifugal compressor, leading to problems such as seal failure and rotor vibration.
Two airflow channels are set between the rotor and the balance disc. One channel fills the sealing gap with high-temperature buffer gas, and the other channel discharges the mixed gas. The temperature and pressure of the sealing gap are adjusted to prevent phase transformation, and the mixed gas is guided to the compressor inlet through a duct to balance the axial thrust.
It effectively prevents the phase transformation of carbon dioxide within the sealing gap, improves the reliability of the sealing structure and the service life of the compressor, balances axial thrust, and avoids rotor vibration.
Smart Images
Figure CN223523996U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to compressor / seal technical field, specifically provides a kind of sealing structure and carbon dioxide centrifugal compressor. BACKGROUND
[0002] In the sealing process of carbon dioxide centrifugal compressor, carbon dioxide often leaks from high-pressure sealing cavity to low-pressure sealing cavity, and converts internal energy into kinetic energy through tiny sealing gap. In this process, the diffusion speed of carbon dioxide gas will increase, and the temperature and pressure will decrease. However, carbon dioxide is prone to phase transformation in the tiny sealing gap, and presents liquid or solid state, which leads to sealing failure and even rotor vibration, so that the unit cannot operate normally.
[0003] Therefore, there is an urgent need for a carbon dioxide centrifugal compressor to solve the above problems. INVENTION CONTENTS
[0004] One object of the utility model is to solve the problem of sealing failure or rotor vibration caused by phase transformation of carbon dioxide medium when passing through the sealing gap in the existing carbon dioxide centrifugal compressor.
[0005] To achieve the above object, the utility model provides a sealing structure of carbon dioxide centrifugal compressor, the compressor includes a rotor and a balance disc, the sealing structure is arranged between the rotor and the balance disc, and the shaft end of the rotor is dry gas sealed; the sealing structure comprises:
[0006] A first gas flow channel is used to fill high-temperature buffer gas into the sealing gap.
[0007] A second gas flow channel is used to discharge the mixed gas of dry gas seal and high-temperature buffer gas in the sealing gap.
[0008] Further, the sealing structure further comprises a first sealing surface and a second sealing surface, the first sealing surface is arranged on the side close to the balance disc, and the first sealing surface and the second sealing surface are respectively located on both sides of the first gas flow channel; the first gas flow channel is used to leak the high-temperature buffer gas introduced along the sealing gap where the first sealing surface and the second sealing surface are located on both sides thereof.
[0009] Further, the sealing structure further comprises a third sealing surface, the third sealing surface is arranged on the side close to the compressor rotor, and the second sealing surface and the third sealing surface are respectively located on both sides of the second gas flow channel; the second gas flow channel is used to discharge the sealing gas in the sealing gap where the third sealing surface is located and the high-temperature buffer gas in the sealing gap where the second sealing surface is located.
[0010] Further, the sealing body where the first sealing surface, the second sealing surface and the third sealing surface are located is integrally arranged.
[0011] Further, the sealing body where the first sealing surface and the second sealing surface are located is integrally arranged; and the sealing body where the third sealing surface is located is separately arranged.
[0012] Further, any one or more of the first sealing surface, the second sealing surface and the third sealing surface is arranged as a comb tooth, a honeycomb or a carbon ring.
[0013] Further, the sealing body where the third sealing surface is located is arranged as a shaft end seal.
[0014] Further, the first gas flow channel and the second gas flow channel are integrally arranged to be inclined to avoid gas backflow.
[0015] Further, a slope buffer groove is arranged at the entrance of the first gas flow channel.
[0016] Further, the first gas flow channel is arranged as one or more, and a plurality of the first gas flow channels are uniformly arranged along the circumference of the sealing structure; and / or, the second gas flow channel is arranged as one or more, and a plurality of the second gas flow channels are uniformly arranged along the circumference of the sealing structure.
[0017] Further, a carbon dioxide centrifugal compressor comprises the sealing structure of any one of the preceding carbon dioxide centrifugal compressors.
[0018] Further, the carbon dioxide centrifugal compressor further comprises a guide pipe arranged at the second gas flow channel for guiding the mixed gas to the entrance of the compressor.
[0019] Based on the foregoing description, those skilled in the art can understand that, in the technical solutions of the preceding carbon dioxide centrifugal compressor, two gas flow channels are additionally arranged on the sealing gap between the rotor and the balance disc, one of the gas flow channels is used to fill high-temperature buffer gas into the sealing gap to provide a relatively high-temperature atmosphere in the sealing gap, thereby effectively avoiding the problem of physical and chemical transformation of carbon dioxide in the sealing gap; and the other gas flow channel is used to discharge the extra gas flow in the sealing gap to balance the pressure in the sealing gap. The carbon dioxide medium is prevented from being physically and chemically transformed when passing through the sealing gap, thereby effectively improving the service life of the compressor.
[0020] Further, by adding a conduit at the second gas flow channel and guiding the mixed gas to the compressor inlet by the conduit, the pressure in the cavity behind the balance disc is approximately equal to the pressure at the compressor inlet, and the axial thrust generated by the pressure difference between the front and back of the balance disc is opposite to the direction of the main thrust of the rotor, which can also balance the thrust. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the present application, the following will describe some embodiments of the present application with reference to the accompanying drawings. Those skilled in the art should understand that the components or parts indicated by the same reference signs in different drawings are the same or similar; the drawings of the present application are not necessarily drawn to scale. In the drawings:
[0022] Figure 1 is a partial structure sectional view of the compressor in some embodiments of the present application;
[0023] Figure 2 is Figure 1 a schematic diagram of the gas flow direction of the compressor.
[0024] Explanation of Reference Signs:
[0025] 100, compressor; 1, rotor; 2, balance disc; 3, sealing structure; 31, first gas flow channel; 32, second gas flow channel; 33, first sealing surface; 34, second sealing surface; 35, third sealing surface; 36, slope buffer groove. DETAILED DESCRIPTION
[0026] Those skilled in the art should understand that the embodiments described below are only a part of the embodiments of the present application, not all the embodiments of the present application, and the part of the embodiments are intended to explain the technical principles of the present application, not to limit the protection scope of the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the present application.
[0027] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.
[0028] In addition, it needs to be explained that, in the description of the utility model, unless another explicit provision and limitation, the term "mounting", "connecting", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected; can be mechanical connection, also can be electrical connection; can be directly connected, also can be indirectly connected through the intermediate medium, also can be two elements inside the communication. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.
[0029] The following refers to Figure 1 And Figure 2 , to the structure of carbon dioxide centrifugal compressor in some embodiments of the utility model is described in detail. Among them, Figure 1 It is the partial structure sectional view of the compressor in some embodiments of the utility model; Figure 2 It is Figure 1 The gas flow direction schematic diagram of the compressor in some embodiments of the utility model.
[0030] Before this, it needs to be explained that, in order to facilitate the description, and in order to enable those skilled in the art to quickly understand the technical scheme of the utility model, the following only to the technical features that are relatively strong (directly related or indirectly related) with the technical problem and / or technical concept to be solved by the utility model are described, for the technical features that are relatively weak with the technical problem and / or technical concept to be solved by the utility model are not described again. Since the technical features that are relatively weak belong to the common knowledge of the prior art, therefore, the utility model even does not describe the relatively weak features, also will not lead to the disclosure of the utility model is insufficient.
[0031] As Figure 1 Indicated, in some embodiments of the utility model, a sealing structure 3 of carbon dioxide centrifugal compressor 100 is provided, and the compressor 100 includes a rotor 1 and a balance disc 2, and the sealing structure 3 is arranged between the rotor 1 and the balance disc 2. The shaft end of the rotor 1 is dry gas sealed.
[0032] The sealing structure 3 includes a first gas flow passage 31 and a second gas flow passage 32, the first gas flow passage 31 is used to fill high-temperature buffer gas into the sealing gap, to provide a relatively high-temperature atmosphere in the sealing gap, effectively avoiding the problem of carbon dioxide in the sealing gap. The second gas flow passage 32 is used to discharge the mixed gas of the sealing gas and the high-temperature buffer gas in the sealing gap.
[0033] Those skilled in the art can understand that, in order to provide a relatively high-temperature atmosphere in the sealing gap, the gas flow rate of the high-temperature buffer gas into the first gas flow passage can be set to be greater than the flow rate of the mixed gas diffused in the second gas flow passage 32, which can also play a role in avoiding backflow of gas flow.
[0034] The first gas flow channel 31 and the second gas flow channel 32 are integrally inclined to avoid backflow of the gas. In order to avoid backflow of the gas in the second gas flow channel 32, a check valve can also be arranged on the conduit.
[0035] A slope buffer groove 36 is arranged at the inlet of the first gas flow channel 31 to buffer the high-temperature buffer gas flowing into the second gas flow channel 32 and then guide the high-temperature buffer gas into the sealing gap through the first gas flow channel 31. The slope buffer groove 36 is integrally inclined downward toward the compressor 100 rotor 1.
[0036] The first gas flow channel 31 is arranged as one or more, and the plurality of first gas flow channels 31 are uniformly arranged along the circumference of the sealing structure 3.
[0037] The second gas flow channel 32 is arranged as one or more, and the plurality of second gas flow channels 32 are uniformly arranged along the circumference of the sealing structure 3.
[0038] The sealing structure 3 comprises a first sealing surface 33 and a second sealing surface 34, the first sealing surface 33 is arranged on the side close to the balance disc 2, and the first sealing surface 33 and the second sealing surface 34 are respectively located on the two sides of the first gas flow channel 31. Figure 2 As shown in the figure, the high-temperature buffer gas flowing into the first gas flow channel 31 leaks along the sealing gap where the first sealing surface 33 and the second sealing surface 34 are located.
[0039] The sealing structure 3 further comprises a third sealing surface 35, the third sealing surface 35 is arranged on the side close to the compressor 100 rotor 1, and the second sealing surface 34 and the third sealing surface 35 are respectively located on the two sides of the second gas flow channel 32. Figure 2 As shown in the figure, the second gas flow channel 32 is used to discharge the sealing gas in the sealing gap where the third sealing surface 35 is located and the high-temperature buffer gas in the sealing gap where the second sealing surface 34 is located.
[0040] In some other embodiments of the present application, the sealing bodies where the first sealing surface 33, the second sealing surface 34 and the third sealing surface 35 are located are integrally arranged.
[0041] In some other embodiments of the present application, in order to facilitate the maintenance / replacement of the staff, the sealing bodies where the first sealing surface 33 and the second sealing surface 34 are located are integrally arranged. The sealing body where the third sealing surface 35 is located is separately arranged. In this embodiment, the sealing body where the third sealing surface 35 is located is integrally arranged as a shaft end seal.
[0042] Optionally, any one or more of the first sealing surface 33, the second sealing surface 34 and the third sealing surface 35 is arranged as a comb, a honeycomb or a carbon ring.
[0043] In other embodiments of the utility model, a carbon dioxide centrifugal compressor 100 is also provided, comprising the carbon dioxide centrifugal compressor sealing structure 3 described above.
[0044] Wherein, carbon dioxide centrifugal compressor 100 also includes the guide pipe, guide pipe is arranged at second air flow passageway 32, and guide pipe is used to guide mixed gas to compressor 100 entrance, so that the pressure in the rear cavity of balance disc 2 is approximately equal to the pressure at the entrance of compressor 100, and the axial thrust generated by the pressure difference before and after balance disc 2 is opposite to the direction of rotor main thrust, and the setting of guide pipe can also achieve the effect of balancing thrust. In order to make the gas flow rate of second air flow passageway 32 controllable, flow detection instrument can be additionally arranged on guide pipe.
[0045] The skilled in the art can understand that the utility model adds two air flow passageways on the sealing gap between rotor 1 and balance disc 2, fills high-temperature buffer gas into the sealing gap through one air flow passageway, provides a relatively high-temperature atmosphere in the sealing gap, effectively avoids the problem of carbon dioxide chemical transformation in the sealing gap, and discharges the extra air flow in the sealing gap through another air flow passageway to balance the pressure in the sealing gap.
[0046] Further, by additionally arranging guide pipe at second air flow passageway 32, and guiding mixed gas to the entrance of compressor through guide pipe, the pressure in the rear cavity of balance disc 2 is approximately equal to the pressure at the entrance of compressor, and the axial thrust generated by the pressure difference before and after balance disc 2 is opposite to the direction of rotor main thrust, which can also achieve the effect of balancing thrust.
[0047] So far, the technical scheme of the utility model has been described in combination with the foregoing multiple embodiments, but the skilled in the art can understand that the protection scope of the utility model is not limited to these specific embodiments. Without deviating from the technical principle of the utility model, the skilled in the art can disassemble and combine the technical scheme in each of the foregoing embodiments, and can make equivalent changes or replacements to related technical features, and any change, equivalent replacement, improvement, etc. made within the technical concept and / or technical principle of the utility model will fall within the protection scope of the utility model.
Claims
1. A seal structure of a carbon dioxide centrifugal compressor, characterized by, The compressor comprises a rotor and a balance disc, the sealing structure is arranged between the rotor and the balance disc, and the shaft end of the rotor is subjected to dry gas sealing; the sealing structure comprises: A first gas flow channel for filling high-temperature buffer gas into the sealing gap; A second gas flow channel for discharging the mixed gas of the dry gas seal and the high-temperature buffer gas in the sealing gap.
2. The sealing structure of the carbon dioxide centrifugal compressor according to claim 1, wherein the sealing structure further comprises a first sealing surface and a second sealing surface, the first sealing surface is arranged on the side close to the balance disc, and the first sealing surface and the second sealing surface are respectively located on both sides of the first gas flow channel; The first gas flow channel is used for leaking the high-temperature buffer gas introduced along the sealing gap where the first sealing surface and the second sealing surface are located on both sides thereof.
3. The sealing structure of the carbon dioxide centrifugal compressor according to claim 2, wherein the sealing structure further comprises a third sealing surface, the third sealing surface is arranged on the side close to the compressor rotor, and the second sealing surface and the third sealing surface are respectively located on both sides of the second gas flow channel; The second gas flow channel is used for discharging the sealing gas in the sealing gap where the third sealing surface is located and the high-temperature buffer gas in the sealing gap where the second sealing surface is located.
4. The sealing structure of the carbon dioxide centrifugal compressor according to claim 3, wherein the sealing body where the first sealing surface, the second sealing surface and the third sealing surface are located is integrally arranged.
5. The sealing structure of the carbon dioxide centrifugal compressor according to claim 3, wherein the sealing body where the first sealing surface and the second sealing surface are located is integrally arranged as a whole; The sealing body where the third sealing surface is located is separately arranged.
6. The sealing structure of the carbon dioxide centrifugal compressor according to claim 3, wherein any one or more of the first sealing surface, the second sealing surface and the third sealing surface is arranged as a comb, a honeycomb or a carbon ring.
7. The sealing structure of the carbon dioxide centrifugal compressor according to claim 5, wherein the sealing body where the third sealing surface is located is arranged as a shaft end seal.
8. The sealing structure of the carbon dioxide centrifugal compressor according to claim 1, wherein the first gas flow channel and the second gas flow channel are integrally arranged as a whole in an inclined manner to avoid gas backflow.
9. The sealing structure of the carbon dioxide centrifugal compressor according to claim 1, wherein a slope buffer groove is arranged at the inlet of the first gas flow channel.
10. The sealing structure of the carbon dioxide centrifugal compressor according to claim 1, wherein the first gas flow channel is arranged as one or more, and a plurality of the first gas flow channels are uniformly arranged along the circumference of the sealing structure; and / or the second gas flow channel is arranged as one or more, and a plurality of the second gas flow channels are uniformly arranged along the circumference of the sealing structure. The sealing structure of the carbon dioxide centrifugal compressor according to any one of claims 1 to 10. Further comprising 11. A carbon dioxide centrifugal compressor characterized by, 12. The carbon dioxide centrifugal compressor of claim 11, wherein, A conduit is provided at the second airflow passage for directing the mixed gas towards the compressor inlet.