Inner and outer rotor coupling structure and zero output system based on inner and outer rotors

Abstract

The utility model relates to the technical field of zero output of a low-pressure cylinder, in particular to an inner and outer rotor coupling structure and a zero output system based on the inner and outer rotors, the inner and outer rotor coupling structure comprises a low-pressure cylinder, an inner rotor and an outer rotor which are arranged in the low-pressure cylinder, an inner coupling mechanism and an outer coupling mechanism, the inner coupling mechanism is arranged on the inner rotor, and the outer coupling mechanism is arranged on the outer rotor. The outer coupling mechanism is arranged on the outer rotor, and the inner coupling mechanism is in coupling connection with the outer coupling mechanism. By arranging the inner rotor and the outer rotor, the inner rotor and the outer rotor can be coupled or separated, so that the mode of the low-pressure cylinder is changed, the outer rotor cannot drive the inner rotor to rotate in the separated state, the inner rotor can normally transmit power output of the high-pressure cylinder and the intermediate-pressure cylinder, and the low-pressure cylinder normally outputs power in the coupled state. The low-pressure cylinder zero-output mode does not need to introduce cooling steam, compared with optical axis heat supply, the rotor does not need to be replaced repeatedly, and regulation and control are more flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of low-pressure cylinder zero-output, in particular to an inner and outer rotor coupling structure and a zero-output system based on the inner and outer rotors. Background Art

[0002] The traditional low-pressure cylinder zero-output heating technology is to cut off the steam inlet of the original steam inlet pipe of the low-pressure cylinder under the high-vacuum operation condition of the low-pressure cylinder, and introduce a small amount of cooling steam through a newly added bypass pipe to take away the blast heat generated by the rotation of the low-pressure rotor after the zero-output transformation of the low-pressure cylinder, thereby achieving near-zero-output operation of the low-pressure cylinder, thereby greatly reducing the cooling steam consumption of the low-pressure cylinder, reducing the cold source loss of the unit, and greatly improving the heating capacity, power peak-shaving capacity and heating economy of the unit.

[0003] The disadvantages of traditional low-pressure cylinder zero-output heating technology are:

[0004] (1) It is necessary to draw about 30 t / h or even more cooling steam from the exhaust steam of the intermediate pressure cylinder to the steam inlet of the low pressure cylinder for cooling the last stage blades of the low pressure cylinder. This indicates that the heating potential of the unit has not been fully tapped.

[0005] (2) The operating conditions of the low-pressure cylinder flow passage part deviate significantly from the design conditions and operate under extremely low volume flow conditions. The last two stages of the low-pressure cylinder blades may produce a negative angle of attack of the steam inlet, resulting in flow separation of steam on the pressure surface of the blades, increasing the dynamic stress, blasting and water erosion of the blades, which may induce blade flutter and threaten the safe operation of the unit. Utility Model Content

[0006] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0007] In view of the problem that the above-mentioned zero-output mode does not fully tap the heating potential and poses certain risks to the safe operation of the unit, the present utility model is proposed.

[0008] Therefore, the purpose of the utility model is to provide an inner and outer rotor coupling structure.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions: an inner and outer rotor coupling structure, including a low-pressure cylinder, an inner rotor and an outer rotor arranged in the low-pressure cylinder, including an inner coupling mechanism and an outer coupling mechanism, the inner coupling mechanism is arranged on the inner rotor, the outer coupling mechanism is arranged on the outer rotor, and the inner coupling mechanism is coupled to the outer coupling mechanism.

[0010] As a preferred embodiment of the internal and external rotor coupling structure of the present utility model, wherein: the internal coupling mechanism further includes main couplings disposed at both ends of the internal rotor, the external coupling mechanism further includes secondary couplings disposed at both ends of the external rotor, and a connecting member connecting the main couplings and the secondary couplings.

[0011] As a preferred embodiment of the internal and external rotor coupling structure of the present utility model, wherein: the main couplings and the secondary couplings are adapted in terms of size and shape, the connecting member is adapted to the main couplings and the secondary couplings, and there is an end gap between the main couplings and the secondary couplings.

[0012] As a preferred embodiment of the internal and external rotor coupling structure of the present utility model, wherein: the internal coupling mechanism further includes copper conductors disposed on the internal rotor, and the external coupling mechanism further includes permanent magnets detachably disposed on the external rotor.

[0013] As a preferred embodiment of the internal and external rotor coupling structure of the present utility model, wherein: the copper conductors are laid on the outer surface of the internal rotor, there are several permanent magnets, and the permanent magnets are arranged at intervals according to N and S poles on the inner wall of the external rotor.

[0014] As a preferred embodiment of the internal and external rotor coupling structure of the present utility model, wherein: the positions of the permanent magnets correspond to those of the copper conductors, the permanent magnets generate an induced magnetic field on the copper conductors, and the induced magnetic field is coupled with the permanent magnetic field.

[0015] The beneficial effects of the internal and external rotor coupling structure of the present utility model: By providing an internal rotor and an external rotor, the internal rotor and the external rotor can be coupled or separated, thereby changing the mode of the low-pressure cylinder. In the separated state, the external rotor will not drive the internal rotor to rotate, and the internal rotor can normally transmit the power output of the high-pressure cylinder and the intermediate-pressure cylinder. In the coupled state, the low-pressure cylinder outputs power normally, and the zero-output mode of the low-pressure cylinder does not require the introduction of cooling steam. Compared with the optical shaft heating, there is no need to repeatedly replace the rotor, and the regulation is more flexible.

[0016] The present utility model also provides the following technical solution: A low-pressure cylinder zero-output system based on internal and external rotors, including the above-mentioned internal and external rotor coupling structure, and further including a unit, including a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a generator; an internal rotor drivingly connected to the high-pressure cylinder, the intermediate-pressure cylinder, and the generator, an external rotor directly driving the low-pressure cylinder, and a coupling transmission mechanism disposed between the internal rotor and the external rotor.

[0017] As a preferred embodiment of the low-pressure cylinder zero-output system based on internal and external rotors of the present utility model, wherein: the unit further includes a connecting pipe connecting the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder to each other, a regulating valve on the connecting pipe between the intermediate-pressure cylinder and the low-pressure cylinder, and a heating pipe communicating with the regulating valve.

[0018] As a preferred embodiment of the low-pressure cylinder zero output system based on inner and outer rotors of the present utility model, wherein: the coupling transmission mechanism is used to connect or separate the inner rotor and the outer rotor of the low-pressure cylinder.

[0019] As a preferred embodiment of the low-pressure cylinder zero output system based on inner and outer rotors of the present utility model, wherein: the coupling transmission mechanism has two modes, namely a separated state and a coupled state. When the coupling transmission mechanism is separated, the inner rotor and the outer rotor are disengaged.

[0020] Beneficial effects of the low-pressure cylinder zero output system based on inner and outer rotors of the present utility model: The present utility model can flexibly realize a new method for zero output operation and normal operation of the steam turbine low-pressure cylinder through separation or coupling of the coupling transmission mechanism. When the coupling transmission mechanism is separated, the low-pressure cylinder enters the zero output mode. Compared with the traditional low-pressure cylinder zero output mode, the low-pressure cylinder blades no longer rotate, and there is no need to introduce cooling steam into the low-pressure cylinder, avoiding the problems of safe operation of the unit caused by the traditional low-pressure cylinder zero output method, and further tapping the heating potential of the unit. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0022] Figure 1 It is an overall schematic diagram of a low-pressure cylinder zero output system based on inner and outer rotors.

[0023] Figure 2 It is a schematic diagram of an embodiment of a coupling structure based on inner and outer rotors.

[0024] Figure 3 It is a schematic diagram of another embodiment of a coupling structure based on inner and outer rotors. Detailed Embodiments

[0025] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific embodiments of the present utility model in conjunction with the drawings of the specification.

[0026] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0027] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in at least one implementation manner of the present utility model. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments.

[0028] Embodiment 1

[0029] Referring to Figure 1 - Figure 2 , it is the first embodiment of the present utility model. This embodiment provides an internal and external rotor coupling structure, which includes a low-pressure cylinder 103, an internal rotor 108 and an external rotor 110 arranged in the low-pressure cylinder 103. It also includes an internal coupling mechanism 200 and an external coupling mechanism 300. The internal coupling mechanism 200 is arranged on the internal rotor 108, and the external coupling mechanism 300 is arranged on the external rotor 110. The internal coupling mechanism 200 is coupled to the external coupling mechanism 300. The internal rotor 108 is connected to the transmission for transmitting the power of the high-pressure cylinder 101 and the intermediate-pressure cylinder 102, and the external rotor 110 is connected to the blades of the low-pressure cylinder 103.

[0030] Specifically, the internal coupling mechanism 200 further includes main couplings 202 arranged at both ends of the internal rotor 108, and connecting members 203 connected to the main couplings 202. The external coupling mechanism 300 further includes sub-couplings 302 arranged at both ends of the external rotor 110. The main couplings 202 and the sub-couplings 302 are connected by the connecting members 203. The connecting members 203 can be bolt nuts or other structures that can perform the same function. When the connecting members 203 connect the main couplings 202 and the sub-couplings 302, the internal rotor 108 and the external rotor 110 are coupled. Removing the connecting members 203 can separate the internal rotor 108 and the external rotor 110.

[0031] Furthermore, the main couplings 202 and the sub-couplings 302 are adapted in size and shape, and the connecting members 203 are adapted to the main couplings 202 and the sub-couplings 302. There is an end gap 303 between the main couplings 202 and the sub-couplings 302, and there is also a certain gap between the internal and external rotors 110, so as to prevent mutual rubbing between the two during operation.

[0032] Operation process: When the internal rotor 108 and the external rotor 110 are coupled, the main couplings 202 and the sub-couplings 302 are connected by using the connecting members 203. Steam is introduced into the low-pressure cylinder 103 to drive the blades to rotate. The blades drive the internal rotor 108 to rotate through the external rotor 110, so as to output power. When the internal rotor 108 and the external rotor 110 are separated, the connecting members 203 are removed. At this time, the external rotor 110 is separated from the internal rotor 108, steam no longer enters the low-pressure cylinder 103, the internal rotor 108 transmits power, and the blades of the low-pressure cylinder 103 no longer rotate.

[0033] Embodiment 2

[0034] Reference Figure 3 As shown in Figure 3 , this is the second embodiment of the present utility model. Different from the previous embodiment, an internal and external rotor coupling structure is further provided, which includes the above-mentioned internal coupling mechanism 200 and external coupling mechanism 300. The internal coupling mechanism 200 includes an internal rotor 108, and the external coupling mechanism 300 includes an external rotor 110. The internal rotor 108 is coupled and connected to the external rotor 110, and the internal rotor 108 is drivingly connected to the external rotor 110 for transmitting the power of the high-pressure cylinder 101 and the intermediate-pressure cylinder 102. The external rotor 110 is connected to the blades of the low-pressure cylinder 103. The internal coupling mechanism 200 further includes a copper conductor 204 disposed on the internal rotor 108, and the external coupling mechanism 300 further includes a permanent magnet 304 detachably disposed on the external rotor 110. The copper conductor 204 is used to generate induced current and induced magnetic field, and the setting position of the permanent magnet 304 corresponds to that of the copper conductor 204. According to the principle of electromagnetic induction, a permanent magnet current is generated on the copper conductor 204 by using the permanent magnetic field.

[0035] Specifically, the copper conductor 204 is laid on the outer surface of the internal rotor 108. A plurality of permanent magnets 304 are provided, and the permanent magnets 304 are arranged at intervals according to the N and S poles on the inner wall of the external rotor 110. The permanent magnets 304 are detachably installed and are arranged in a circumferential array. The axes of the permanent magnets 304 and the copper conductor 204 coincide with the axes of the internal rotor 108 and the external rotor 110.

[0036] Furthermore, the positions of the permanent magnets 304 and the copper conductor 204 correspond to each other. The permanent magnets 304 generate an induced magnetic field on the copper conductor 204, and the induced magnetic field is coupled with the permanent magnetic field.

[0037] The remaining structures are the same as those in Embodiment 2.

[0038] Operation process: When the internal and external rotors 110 need to be coupled, the steam turbine drives the external rotor 110 with the permanent magnets 304 to rotate. According to the principle of electromagnetic induction, an induced current will be generated on the copper conductor 204, and the induced magnetic field generated by the induced current is coupled with the permanent magnetic field generated by the permanent magnets 304, thereby driving the internal rotor 108 to rotate and realizing the transmission of torque. When the internal and external rotors 110 need to be separated, the permanent magnets 304 on the inner layer of the external rotor 110 can be removed to realize the independent operation of the internal and external rotors 110.

[0039] Embodiment 3

[0040] Reference Figure 1, which is the third embodiment of the present utility model. Different from the above embodiments, this embodiment provides a low-pressure cylinder zero-output system based on an inner rotor and an outer rotor, including the above-mentioned inner-outer rotor coupling structure, and further including a unit 100, which includes a high-pressure cylinder 101, an intermediate-pressure cylinder 102, a low-pressure cylinder 103, and a generator 104. An inner rotor 108 is connected to the high-pressure cylinder 101, the intermediate-pressure cylinder 102, and the generator 104 in a transmission manner. An outer rotor 110 directly drives the low-pressure cylinder 103, and a coupling transmission mechanism 109 is arranged between the inner rotor 108 and the outer rotor 110.

[0041] Specifically, the high-pressure cylinder 101 and the intermediate-pressure cylinder 102 adopt conventional structures. The coupling transmission mechanism 109 adopts a separable inner coupling mechanism 200 and an outer coupling mechanism 300. The inner coupling mechanism 200 is connected to the inner rotor 108, and the outer coupling mechanism 300 is connected to the blades of the low-pressure cylinder 103. They can be conveniently connected or separated, so as to realize the regulation of the zero-output mode of the low-pressure cylinder 103.

[0042] Furthermore, the unit 100 further includes a connecting pipe 105 that connects the high-pressure cylinder 101, the intermediate-pressure cylinder 102, and the low-pressure cylinder 103 to each other, a regulating valve 106 on the connecting pipe 105 between the intermediate-pressure cylinder 102 and the low-pressure cylinder 103, and a heating pipe 107 connected to the regulating valve 106. The connecting pipe 105 is used to transport steam. The regulating valve 106 is used to control whether steam is input from the intermediate-pressure cylinder 102 to the low-pressure cylinder 103. When the coupling transmission mechanism 109 is in the coupling state, the regulating valve 106 controls the steam to be sent from the intermediate-pressure cylinder 102 to the low-pressure cylinder 103. When the coupling transmission mechanism 109 is in the separated state, the regulating valve 106 controls the steam to be output to the outside through the heating pipe 107, and utilizes the cooling steam that originally needed to enter the low-pressure cylinder 103.

[0043] Furthermore, the coupling transmission mechanism 109 is used to connect the blades in the low-pressure cylinder 103 to the inner rotor 108. The coupling transmission mechanism 109 can use connection by a connecting piece 203, magnetic non-contact connection, etc., as long as the functions of separation and coupling can be realized.

[0044] Furthermore, the coupling transmission mechanism 109 has two modes: a separated state and a coupled state. When the coupling transmission mechanism 109 is separated, the low-pressure cylinder 103 is disengaged from the inner rotor 108. When the coupling transmission mechanism 109 is coupled, the blades inside the low-pressure cylinder 103 are connected to the inner rotor 108.

[0045] According to the transformation experience of domestic currently mainstream 300MW or 600MW cogeneration units 100, the exhaust steam of the 30t / h intermediate-pressure cylinder 102 is equivalent to a heating capacity of about 22.5MW / h. Calculated according to the comprehensive heating index of about 45W / ㎡ during residential heating, the heat supply area that can be served is about 500,000 square meters.

[0046] Using the coupling drive mechanism 109 can avoid the problems of the safe operation of the unit 100 caused by the operation of the traditional low-pressure cylinder 103 with zero output force at a small volume flow rate of the low-pressure cylinder 103. At the same time, due to the increase in the heat supply, the operation efficiency of the unit 100 is improved.

[0047] Compared with using an optical axis for heat supply, there is no need to disassemble the entire shaft, and the optical axis needs to be disassembled and assembled according to the heating period and non-heating period, while the coupling drive mechanism 109 only needs to adjust whether to couple, which is more flexible.

[0048] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of not substantially deviating from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0049] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (that is, those features that are not relevant to the currently considered best mode of implementing the present utility model, or those features that are not relevant to the implementation of the present utility model).

[0050] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An internal and external rotor coupling structure, comprising a low-pressure cylinder (103), an internal rotor (108) and an external rotor (110) arranged in the low-pressure cylinder (103), characterized in that: include, An inner coupling mechanism (200) and an outer coupling mechanism (300), The inner coupling mechanism (200) is arranged on the inner rotor (108), the outer coupling mechanism (300) is arranged on the outer rotor (110), and the inner coupling mechanism (200) is coupled to the outer coupling mechanism (300).

2. The internal and external rotor coupling structure according to claim 1, wherein: The inner coupling mechanism (200) further comprises a main coupling (202) arranged at both ends of the inner rotor (108), and the outer coupling mechanism (300) further comprises a secondary coupling (302) arranged at both ends of the outer rotor (110), and a connecting member (203) connecting the main coupling (202) and the secondary coupling (302).

3. The internal and external rotor coupling structure according to claim 2, characterized in that: The main coupling (202) and the secondary coupling (302) are compatible in size and shape, the connecting piece (203) is compatible with the main coupling (202) and the secondary coupling (302), and an end gap (303) is left between the main coupling (202) and the secondary coupling (302).

4. The internal and external rotor coupling structure according to claim 1, characterized in that: The inner coupling mechanism (200) further comprises a copper conductor (204) arranged on the inner rotor (108), and the outer coupling mechanism (300) further comprises a permanent magnet (304) detachably arranged on the outer rotor (110).

5. The internal and external rotor coupling structure according to claim 4, characterized in that: The copper conductor (204) is laid on the outer surface of the inner rotor (108), a plurality of permanent magnets (304) are provided, and the permanent magnets (304) are arranged on the inner wall of the outer rotor (110) at intervals according to N and S poles.

6. The internal and external rotor coupling structure according to claim 5, wherein: The permanent magnet (304) corresponds to the position of the copper conductor (204), and the permanent magnet (304) generates an induced magnetic field on the copper conductor (204), and the induced magnetic field is coupled with the permanent magnet magnetic field.

7. A low-pressure cylinder zero-output system based on an inner and outer rotor, comprising the inner and outer rotor coupling structure according to any one of claims 1 to 6, characterized in that: Also included is a unit (100), including a high-pressure cylinder (101), a medium-pressure cylinder (102), a low-pressure cylinder (103), and a generator (104); An inner rotor (108) drivingly connected to the high-pressure cylinder (101), the medium-pressure cylinder (102), and the generator (104) directly drives the outer rotor (110) of the low-pressure cylinder (103), and a coupling transmission mechanism (109) is arranged between the inner rotor (108) and the outer rotor (110).

8. The zero output system of the low-pressure cylinder based on the inner and outer rotors according to claim 7, characterized in that: The unit (100) further comprises a connecting pipe (105) for interconnecting the high-pressure cylinder (101), the medium-pressure cylinder (102), and the low-pressure cylinder (103), a regulating valve (106) on the connecting pipe (105) between the medium-pressure cylinder (102) and the low-pressure cylinder (103), and a heat supply pipe (107) connected to the regulating valve (106).

9. The zero output system of the low-pressure cylinder based on the inner and outer rotors according to claim 8, characterized in that: The coupling transmission mechanism (109) is used to connect or disconnect the inner rotor (108) and the outer rotor (110) of the low-pressure cylinder (103).

10. The zero output system of the low-pressure cylinder based on the inner and outer rotors according to claim 9, characterized in that: The coupling transmission mechanism (109) has two modes: a separation state and a coupling state. When the coupling transmission mechanism (109) is separated, the inner rotor (108) and the outer rotor (110) are separated.

Images