Pull rod rotor for high-temperature steam compressor and high-temperature steam compressor

Abstract

The invention provides a pull rod rotor for a high-temperature steam compressor and the high-temperature steam compressor, the pull rod rotor comprises a rotor and an impeller group, the rotor comprises a first rotating shaft and a second rotating shaft which are arranged at an interval, and the first rotating shaft is connected with a driving mechanism; the impeller set comprises at least one impeller and is arranged between the first rotating shaft and the second rotating shaft, and the two opposite ends of the impeller set are in tooth meshing connection with the first rotating shaft and the second rotating shaft respectively. According to the pull rod rotor for the high-temperature steam compressor, compared with a conventional sleeved rotor, interference fit does not exist between the impeller and the rotor, assembling is easier, torque is transmitted through tooth meshing in the rotating process of the rotor, the requirement for stable operation of the high-temperature steam compressor at the high temperature can be met, and the service life of the high-temperature steam compressor is prolonged. Compared with a forged rotor and a welded rotor, the impeller rotor does not need a complex machining process, and therefore the problem of large welding deformation does not exist.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a tie rod rotor for a high-temperature steam compressor and a high-temperature steam compressor. Background Art

[0002] High-temperature steam compressors are one of the key equipment in the current industrial steam supply for comprehensive utilization of nuclear energy. Exhaust flow rates below 1000t / h are almost all centrifugal compressors. When the exhaust temperature is above 500℃, the operating stability of the rotor structure is a very critical technical issue.

[0003] In the field of compressors, commonly used rotor structures include set rotors, integral forged rotors, and welded rotors. When using a conventional set rotor structure, because its set temperature is below 450°C, when the operating temperature of the compressor is above 500°C, problems such as impeller loosening may occur, which cannot meet the needs of normal and stable operation of the compressor. The integral forged rotor has complex structure processing and high process requirements, and the cost remains high. The welding deformation of the welded rotor is large, and the processing quality is difficult to guarantee.

[0004] Based on this, the inventor of the present application proposes a rod rotor for a high-temperature steam compressor and a high-temperature steam compressor, in order to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the operating stability of the compressor rotor decreases when the operating temperature of the compressor exceeds 500°C, and to provide a tie rod rotor for a high-temperature steam compressor and a high-temperature steam compressor.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a rod rotor for a high-temperature steam compressor, which is characterized by comprising:

[0008] The rotor comprises a first rotating shaft and a second rotating shaft which are arranged at an interval, wherein the first rotating shaft is connected to the driving mechanism;

[0009] The impeller assembly comprises at least one impeller, wherein the impeller assembly is arranged between the first rotating shaft and the second rotating shaft, and the opposite ends of the impeller assembly are respectively meshedly connected with the first rotating shaft and the second rotating shaft.

[0010] According to an embodiment of the present invention, a pull rod is inserted into one end of the second rotating shaft away from the first rotating shaft, and one end of the pull rod at least extends to the first rotating shaft and is tightly connected to the first rotating shaft.

[0011] According to one embodiment of the present invention, a first matching hole is opened in the first rotating shaft on the side facing the impeller assembly, and second matching holes are opened in the impeller and the second rotating shaft. One end of the pull rod is passed through the second matching hole and extends into the first matching hole to be connected with the first rotating shaft and the second rotating shaft.

[0012] According to an embodiment of the present invention, the pull rod is fastened to the first rotating shaft in the first matching hole by threaded fitting.

[0013] According to an embodiment of the present invention, a locking nut is sleeved on the outer end of the second rotating shaft away from the first rotating shaft, and one end of the locking nut presses against the end of the second rotating shaft.

[0014] According to one embodiment of the present invention, the impeller assembly includes at least two impellers.

[0015] According to an embodiment of the present invention, adjacent impellers are connected via tooth meshing.

[0016] According to an embodiment of the present invention, the impeller in the impeller assembly close to the first rotating shaft or the second rotating shaft is connected to the first rotating shaft or the second rotating shaft through tooth meshing.

[0017] According to an embodiment of the present invention, adjacent impellers are integrally arranged or welded.

[0018] According to an embodiment of the present invention, the rotor is made of high-temperature alloy GH4169.

[0019] The present invention also provides a high-temperature steam compressor, which is characterized in that it includes the tie rod rotor for the high-temperature steam compressor as described above.

[0020] The positive and progressive effects of the present invention are:

[0021] The tie rod rotor of the high-temperature steam compressor of the present invention has no interference fit between the impeller and the rotor compared to the conventional set rotor, and is easier to assemble. The torque is transmitted by tooth meshing during the rotation of the rotor, which can meet the stable operation of the high-temperature steam compressor at high temperatures. There will be no loosening between the impeller and the rotor, and the rotor has better operating stability at high temperatures.

[0022] Compared with forged rotors and welded rotors, the rotor of the present invention does not require complicated welding processing technology, and thus does not have the problem of large welding deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0024] Figure 1 It is a schematic structural diagram of a tie rod rotor used in a high temperature steam compressor of the present invention;

[0025] Figure 2 It is a schematic diagram of the matching structure between two impellers of the present invention;

[0026] Figure 3 It is a schematic diagram of the matching structure of the rotor and the pull rod without the impeller installed in the present invention.

[0027] 1. rotor; 11. first rotating shaft; 111. first matching hole; 112. first bearing; 12. second rotating shaft; 121. second matching hole; 122. second bearing; 13. locking nut;

[0028] 2. Driving mechanism;

[0029] 3. Impeller assembly; 31. Impeller;

[0030] 4. Pull rod. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Reference Figures 1 to 3 The present invention proposes a rod rotor for a high-temperature steam compressor, comprising a rotor 1 and an impeller group 3, wherein the rotor 1 comprises a first rotating shaft 11 and a second rotating shaft 12 arranged at an interval, and the first rotating shaft 11 is connected to a driving mechanism 2; the impeller group 3 comprises at least one impeller 31, and the impeller group 3 is arranged between the first rotating shaft 11 and the second rotating shaft 12, wherein the opposite ends of the impeller group 3 are respectively meshed with the first rotating shaft 11 and the second rotating shaft 12.

[0034] The first rotating shaft 11, the second rotating shaft 12 and the impeller assembly 3 of the present invention are separate structures, and the first rotating shaft 11, the second rotating shaft 12 and the impeller assembly 3 are assembled by gear meshing.

[0035] One end of the first rotating shaft 11 is connected to the driving mechanism 2. When the driving mechanism 3 is in operation, it will drive the first rotating shaft 11 to rotate. The rotation of the first rotating shaft 11 will drive the impeller group 3 and the second rotating shaft 12 to rotate through tooth engagement. The first rotating shaft 11, the second rotating shaft 12 and the impeller group 3 transmit power through tooth engagement. Compared with the traditional set rotor 1, it is easier to assemble. Compared with the traditional integral forged rotor and welded rotor, the processing technology of the present invention is simpler, and there is no problem of large welding deformation.

[0036] In one embodiment, the driving mechanism 2 can be a motor, and the rotation of the motor will drive the rotation of the first rotating shaft 11. The rotation of the first rotating shaft 11 drives the impeller group 3 to rotate through the gear engagement. The rotation of the impeller group 3 drives the second rotating shaft 12 to rotate through the gear engagement, thereby transmitting power.

[0037] It can be seen that in the traditional set rotor, the impeller is sleeved on the outside of the rotor, and the rotor and the impeller are interference fit. Because the rotor and the impeller are made of different materials, the deformation amount at high temperature is also different, so the impeller is usually sleeved on the rotor through a hot working process.

[0038] On this basis, when the temperature exceeds 500 degrees Celsius, the deformation of the traditional set rotor is smaller than that of the impeller. The higher the temperature, the greater the difference in deformation between the rotor and the impeller, which will eventually lead to loosening. When a certain temperature is reached, the rotor can no longer continue to provide torque to the impeller, and thus cannot meet the requirements of normal and smooth operation of the compressor.

[0039] In the present invention, the impeller 31 and the rotor 1 are not installed in an interference fit manner, but in a split-tooth meshing manner. Compared with the conventional set rotor 1, the present invention is easier to assemble in terms of installation manner, and the assembly efficiency is also better than the conventional set rotor. In terms of operating stability, the rotor 1 of the present invention is suitable for high temperature environments and can maintain stable operation.

[0040] It can be seen that, compared with the traditional integral forging rotor and welded rotor, the processing technology of the present invention is simpler and there is no problem of large welding deformation.

[0041] In the present invention, the number of the impeller 31 in the impeller assembly 3 can be one or more.

[0042] When the number of the impeller 31 in the impeller assembly 3 is one, the two opposite sides of the impeller 31 are respectively meshed with the first rotating shaft 11 and the second rotating shaft 12 .

[0043] When there are more than two impellers 31 in the impeller assembly 3, the two or more impellers 31 can be integrally formed or welded. The two ends of the impeller assembly 3 are meshed with the first rotating shaft 11 and the second rotating shaft 12, respectively.

[0044] Alternatively, adjacent impellers 31 may be connected in a split manner, which is not limited here.

[0045] In one embodiment, a pull rod 4 is inserted into one end of the second rotating shaft 12 away from the first rotating shaft 11 , and one end of the pull rod 4 at least extends to the first rotating shaft 11 and is tightly connected to the first rotating shaft 11 .

[0046] Because the impeller 31, the first rotating shaft 11 and the second rotating shaft 12 are separately arranged, the pull rod 4 is required to provide a tensioning force to prevent the impeller group 3 from separating from the first rotating shaft 11 and the second rotating shaft 12 during the rotation of the rotor 1, so as to ensure the stability of the torque transmission between the first rotating shaft 11, the second rotating shaft 12 and the impeller group 3.

[0047] It can be seen that a first bearing 112 is provided at one end of the first rotating shaft 11 away from the second rotating shaft 12 , and a second bearing 122 is provided at one end of the second rotating shaft 12 away from the first rotating shaft 11 . The first bearing 112 and the second bearing 122 jointly support the rotor 1 .

[0048] Specifically, a first matching hole 111 is opened in the side of the first rotating shaft 11 facing the impeller group 3, a second matching hole 121 is opened in the impeller group 3 and the second rotating shaft 12, one end of the pull rod 4 is passed through the second matching hole 121 and extends into the first matching hole 111 to connect with the first rotating shaft 11 and the second rotating shaft 12.

[0049] That is, one end of the first rotating shaft 11 is hollow, the impeller group 3 and the second rotating shaft 12 are both hollow along their axial directions, and one end of the pull rod 4 is inserted into the second matching hole 121 and extends to the first matching hole 111 to connect the first rotating shaft 11, the second rotating shaft 12 and the impeller 31 and provide a clamping force, so that the integrity between the first rotating shaft 11, the second rotating shaft 12 and the impeller 31 is stronger, thereby making the operation stability of the rotor 1 better.

[0050] Optionally, the pull rod 4 is fixedly connected to the first rotating shaft 11 in the first matching hole 111 by threaded fitting.

[0051] That is, an internal thread is provided in the first matching hole 111 , and an external thread matching the internal thread is provided at the connecting end of the pull rod 4 and the first matching hole 111 .

[0052] In some other implementations, the pull rod 4 and the first rotating shaft 11 may be connected by welding or other methods, which are not limited here.

[0053] It should be noted that a locking nut 13 is sleeved on the outer end of the second rotating shaft 12 away from the first rotating shaft 11. That is, one end of the pulling rod 4 extends to the outside of the second rotating shaft 12 and has an external thread, and the locking nut 13 is used to limit the positions of the first rotating shaft 11, the impeller 31 and the second rotating shaft 12 to prevent the first rotating shaft 11, the impeller 31 and the second rotating shaft 12 from loosening during the rotation of the rotor 1, thereby affecting the operating stability of the compressor.

[0054] In one embodiment, the number of impellers 31 is at least two, and adjacent impellers 31 are connected by tooth meshing.

[0055] The impeller 31 has matching parts at both opposite ends, and the matching parts are tooth-engaged with the first rotating shaft 11, the second rotating shaft 12 or the matching parts of the adjacent impeller 31, and the outer diameter of the matching parts is consistent with the diameter of the first rotating shaft 11 or the second rotating shaft 12.

[0056] The shape of the teeth between adjacent impellers 31 and between the impeller 31 and the first rotating shaft 11 or the second rotating shaft 12 is described in the present invention by taking a triangle as an example, but is not limited thereto. The shape of the teeth may also be a square tooth, a circular tooth, or a polygonal tooth.

[0057] The plurality of teeth are evenly spaced along the outer circumference of the mating portion of the impeller 31 , or are evenly spaced along the outer end circumferences of the first rotating shaft 11 and the second rotating shaft 12 . The specific number of teeth is not limited herein.

[0058] Furthermore, the teeth can be straight teeth or helical teeth, and the inclination direction of the helical teeth is opposite to the normal rotation mode of the rotor 1. Therefore, during the rotation process, the rotor 1 is more conducive to making the connection stability between adjacent impellers 31 or between the impeller group 3 and the first rotating shaft 11 and the second rotating shaft 12 stronger, and the force of transmitting torque is also more stable.

[0059] It can be seen that when there are more than one impeller 31, adjacent impellers 31 can be meshed with teeth or welded into a whole, which is not limited here. The impeller 31 located on the outside and matched with the first rotating shaft 11 or the second rotating shaft 12 is meshed with the first rotating shaft 11 or the second rotating shaft 12 through teeth.

[0060] GH4169 high temperature alloy is a precipitation-strengthened nickel-based high temperature alloy with good comprehensive performance in the temperature range of -253 to 650°C. The yield strength below 650°C ranks first among deformed high temperature alloys, and has good fatigue resistance, radiation resistance, oxidation resistance, corrosion resistance, as well as good processing performance and welding performance. Because the rotor 1 of the present invention needs to meet the high temperature requirements, the high temperature here is at least 500°C, so the material of the rotor 1 of the present invention is selected from the high temperature alloy GH4169, so as to meet the use requirements of the high temperature steam compressor and improve the use safety and stability of the high temperature steam compressor.

[0061] The present invention further provides a high-temperature steam compressor, comprising the above-mentioned tie rod rotor 1 for a high-temperature steam compressor.

[0062] In summary, the tie rod rotor of the high-temperature steam compressor of the present invention has no interference fit between the impeller and the rotor compared to the conventional set rotor, and is easier to assemble. The torque is transmitted by tooth meshing during the rotation of the rotor 1, which can meet the stable operation of the high-temperature steam compressor at high temperatures. There will be no loosening between the impeller and the rotor, and the rotor has better operating stability at high temperatures.

[0063] Compared with forged rotors and welded rotors, the rotor 1 of the present invention does not require complicated welding processing technology, and thus does not have the problem of large welding deformation.

[0064] The rotor 1 of the present invention uses the tie rod 4 to assemble the first rotating shaft 11, the second rotating shaft 12 and the impeller assembly 3. The overall structure of the rotor 1 can meet the normal operation requirements of the compressor unit above 500°C.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "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 also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0067] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0068] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A rod rotor for a high temperature steam compressor, characterized in that: include: The rotor comprises a first rotating shaft and a second rotating shaft which are arranged at an interval, wherein the first rotating shaft is connected to the driving mechanism; The impeller assembly comprises at least one impeller, wherein the impeller assembly is arranged between the first rotating shaft and the second rotating shaft, and the opposite ends of the impeller assembly are respectively meshedly connected with the first rotating shaft and the second rotating shaft.

2. The rod rotor for a high temperature steam compressor according to claim 1, characterized in that: A pull rod is inserted into one end of the second rotating shaft away from the first rotating shaft, and one end of the pull rod at least extends to the first rotating shaft and is tightly connected to the first rotating shaft.

3. The rod rotor for a high temperature steam compressor according to claim 2, characterized in that: A first matching hole is formed in the first rotating shaft on the side facing the impeller assembly, and second matching holes are formed in the impeller and the second rotating shaft. One end of the pull rod is passed through the second matching hole and extends into the first matching hole to be connected with the first rotating shaft and the second rotating shaft.

4. The rod rotor for a high temperature steam compressor according to claim 3, characterized in that: The pull rod is fastened to the first rotating shaft in the first matching hole through threaded matching.

5. The rod rotor for a high temperature steam compressor according to claim 3, characterized in that: The pull rod is sleeved with a locking nut at the outer end of the second rotating shaft away from the first rotating shaft, and one end of the locking nut presses against the end of the second rotating shaft.

6. The rod rotor for a high temperature steam compressor according to claim 1, characterized in that: The impeller assembly includes at least two impellers.

7. The rod rotor for a high temperature steam compressor according to claim 6, characterized in that: Adjacent impellers are connected via tooth meshing.

8. The rod rotor for a high temperature steam compressor according to claim 7, characterized in that: The impeller in the impeller assembly close to the first rotating shaft or the second rotating shaft is connected to the first rotating shaft or the second rotating shaft through tooth meshing.

9. The rod rotor for a high temperature steam compressor according to claim 6, characterized in that: Adjacent impellers are integrally arranged or welded.

10. The rod rotor for a high-temperature steam compressor according to any one of claims 1 to 9, characterized in that: The rotor is made of high-temperature alloy GH4169.

11. A high temperature steam compressor, characterized in that: It comprises a rod rotor for a high-temperature steam compressor as described in any one of claims 1 to 10.

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