Compression and expansion all-in-one machine

Abstract

The embodiment of the invention provides a compression and expansion all-in-one machine. The compression and expansion all-in-one machine comprises an expansion side shell, a guide vane, an expansion wheel, a shaft, a compression side shell, a diffuser, a compression wheel, an expansion side shaft end seal, a compression side shaft end seal, a motor section shell, a motor stator, a temperature control plate and a magnetic suspension bearing. According to the embodiment of the invention, the expansion machine, the compressor and the motor are integrated, the magnetic suspension bearing is adopted for supporting, and the temperature control component is designed to realize partition balance of the temperature in the main machine, so that the main machine is suitable for low-temperature zero-pollution operation conditions; the low-temperature condition of the expansion side is fully utilized, the shaft end seal and the temperature control plate of the expansion side are designed, and the motor is cooled in a mode of combining low-temperature air cooling and low-temperature cold conduction; by adding an auxiliary cooling mode, the variable working condition adaptive capacity of the whole machine in the aspect of motor cooling can be improved.

Description

Technical Field

[0001] The present application relates to the field of turbine machinery technology, and in particular to a compression-expansion integrated machine. Background Art

[0002] The integrated compressor and expander integrate the compressor and expander on the same rotor, eliminating the transmission mechanism such as couplings and gearboxes, simplifying the host configuration and improving the transmission efficiency. At the same time, the rotating parts are integrated in the same host housing, with only static seals to the outside and no dynamic seals, which improves the reliability of the host seal. Compared with traditional centrifugal compressors or turbine expanders, it has outstanding advantages in improving power density and operating reliability.

[0003] The rotors of existing compression expanders used in low-temperature conditions are mostly supported by oil bearings. The lubricating oil and the low-temperature medium gas will inevitably interfere with each other, and an inflatable seal is usually required between the two for isolation, which is unacceptable for some closed-loop systems.

[0004] Conventional compression-expansion machines usually only have two parts, the expansion end and the compression end. When the power of the expansion end and the compression end is seriously mismatched, it is necessary to introduce a motor part in the middle section for power compensation. Under low temperature conditions, since the suitable operating temperature of the motor is very different from the operating temperature of the expansion end, and the temperature has a significant impact on the performance of each, the introduction of the motor part brings new challenges to the temperature field design of the whole machine. Summary of the invention

[0005] The present invention proposes a compression-expansion all-in-one machine, which integrates an expander, a compressor and a motor into one, adopts magnetic suspension bearing support, and designs temperature control components to achieve temperature zone balance inside the host, so that the host is suitable for low-temperature and zero-pollution operating conditions.

[0006] The embodiment of the present invention provides a compression-expansion integrated machine, comprising: an expansion side casing 3, an expansion side end cover 1, an expansion side casing 2, a guide vane 16, an expansion wheel 4, a shaft 14, a compression side casing 7, a compression side end cover 8, a compression side casing 9, a diffuser 17, a compression wheel 10, an expansion side shaft end seal 5, a compression side shaft end seal 11, a motor section casing 12, a motor stator 13, a temperature control plate 15 and a magnetic suspension bearing 6;

[0007] The expansion side housing 3, the expansion side end cover 1, the expansion side casing 2, the guide vane 16, the expansion wheel 4 and the expansion side shaft end seal 5 constitute an expansion side component;

[0008] The compression side housing 7, the compression side end cover 8, the compression side casing 9, the diffuser 17, the compression wheel 10 and the compression side shaft end seal 11 constitute the compression side components;

[0009] The motor segment housing 12, the motor stator 13, the temperature control plate 15 and the magnetic bearing 6 constitute the motor segment components;

[0010] One end of the motor segment component is spliced ​​with the expansion side component, and the other end is spliced ​​with the compression side component;

[0011] The shaft 14 passes through the expansion side component, the motor segment component and the compression side component;

[0012] The expansion wheel 4 is suspended at one end of the shaft 14 and is combined with the expansion side component to form a complete flow-through part of the expander;

[0013] The compression wheel 10 is suspended at the other end of the shaft 14 and is combined with the compression side component to form a complete compressor flow-through part;

[0014] The middle section of the shaft 14 is shrink-fitted with the corresponding magnetic steel assembly 14a, and is combined with the motor section component to form a complete magnetic suspension motor part.

[0015] In some embodiments, the expansion side shaft end seal 5 and the temperature control plate 15 are used to introduce an appropriate amount of cold energy into the motor cavity to achieve motor cooling.

[0016] In some embodiments, the cooling capacity includes low-temperature air cooling and low-temperature conduction cooling.

[0017] In some embodiments, the low-temperature air cooling is achieved through the expansion side shaft end seal 5.

[0018] In some embodiments, the low-temperature air cooling is achieved by the expansion side shaft end seal 5, including: the expansion side shaft end seal 5 is in the form of a comb tooth labyrinth or a carbon ring.

[0019] In some embodiments, the low-temperature cooling is achieved through the temperature control plate 15 .

[0020] In some embodiments, the low-temperature cooling is achieved through the temperature control plate 15, including: the temperature control plate 15 is made of a low thermal conductivity material, or a layer of thermal barrier coating is covered on the surface of the structure to reduce the thermal conductivity.

[0021] In some embodiments, it also includes: auxiliary cooling method.

[0022] In some embodiments, the auxiliary cooling method includes opening an auxiliary cooling air inlet hole in the motor segment housing 12, introducing room temperature medium gas on the system pipeline into the motor cavity, mixing with low temperature cold air, and jointly cooling the motor stator 13.

[0023] In some embodiments, the auxiliary cooling method includes designing an interlayer on the outside of the motor segment housing 12 , and passing a cooling fluid into the interlayer, thereby cooling the motor segment housing 12 and the motor stator 13 .

[0024] The above-mentioned embodiment of the present invention integrates the expander, compressor and motor into one, adopts magnetic bearing support, and designs temperature control components to achieve temperature zone balance inside the host, so that the host is suitable for low-temperature and zero-pollution operation conditions.

[0025] The above-mentioned embodiment of the present invention makes full use of the low temperature condition on the expansion side, and realizes motor cooling by designing the shaft end seal and temperature control plate on the expansion side and adopting a combination of low-temperature air cooling and low-temperature conduction cooling.

[0026] The above-mentioned embodiment of the present invention can improve the adaptability of the whole machine to variable working conditions with respect to motor cooling by adding an auxiliary cooling method. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0028] Figure 1 It is a cross-sectional view of a compression-expansion machine;

[0029] Figure 2 It is a schematic diagram of the cooling scheme without auxiliary cooling;

[0030] Figure 3 Schematic diagram of cooling scheme for adding auxiliary cooling method. DETAILED DESCRIPTION

[0031] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0032] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0033] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0034] The embodiment of the present invention provides a compression-expansion integrated machine, such as Figure 1 As shown, it includes an expansion side casing 3, an expansion side end cover 1, an expansion side casing 2, a guide vane 16, an expansion wheel 4, a shaft 14, a compression side casing 7, a compression side end cover 8, a compression side casing 9, a diffuser 17, a compression wheel 10, an expansion side shaft end seal 5, a compression side shaft end seal 11, a motor section casing 12, a motor stator 13, a temperature control plate 15, and a magnetic suspension bearing 6.

[0035] The expansion side housing 3, the expansion side end cover 1, the expansion side casing 2, the guide vane 16, the expansion wheel 4, and the expansion side shaft end seal 5 constitute the expansion side component; the compression side housing 7, the compression side end cover 8, the compression side casing 9, the diffuser 17, the compression wheel 10, and the compression side shaft end seal 11 constitute the compression side component; the motor section housing 12, the motor stator 13, the temperature control plate 15, and the magnetic suspension bearing 6 constitute the motor section component. One end of the motor section component is spliced ​​with the expansion side component, and the other end is spliced ​​with the compression side component. The shaft 14 runs through the expansion side component, the motor section component, and the compression side component. The expansion wheel 4 is suspended at one end of the shaft 14, and is combined with the expansion side component to form a complete expander flow section. The compression wheel 10 is suspended at the other end of the shaft 14, and is combined with the compression side component to form a complete compressor flow section. The middle section of the shaft 14 is heat-shrink-fitted with the corresponding magnetic steel component 14a, and is combined with the motor section component to form a complete magnetic suspension motor part.

[0036] The motor will generate heat during operation and needs to be cooled in time. This solution uses the low temperature condition on the expansion side to introduce an appropriate amount of cold into the motor cavity through the expansion side shaft end seal 5 and the temperature control plate 15, thereby achieving motor cooling. The cold energy includes two parts: low temperature air cooling and low temperature conduction cooling. The schematic diagram of the cooling solution is shown in the figure. Figure 2 shown.

[0037] Low-temperature air cooling is mainly achieved through the expansion side shaft end seal 5. The expansion side shaft end seal throttles the expansion side low-temperature high-pressure gas to control the flow of cold air. The pressure energy of the gas is converted into heat energy during the flow through the seal, and the temperature will increase accordingly. The expansion side shaft end seal 5 can be in the form of a comb tooth labyrinth or a carbon ring, and the structural design parameters are adjusted according to the cooling demand. The main purpose is to control the amount of low-temperature cold air flowing through the seal into the motor cavity. The low-temperature cold air flow direction is as follows Figure 2 Indicated by the solid red arrow.

[0038] Low-temperature cooling is mainly achieved through the temperature control plate 15. The temperature control plate 15 can be made of low thermal conductivity material, or a layer of thermal barrier coating can be covered on the surface of the structural part to reduce the thermal conductivity. The structural design parameters are adjusted according to the cooling demand. The main purpose is to control the low-temperature cooling amount transmitted from the expansion side through the temperature control plate 15 to the motor side. Figure 2 Indicated by the blue hollow arrow.

[0039] The above-mentioned low-temperature air cooling and low-temperature conduction cooling are used as the main cooling methods for the motor to meet the cooling requirements of the motor. Considering the low temperature conditions on the expansion side and the changes in the heat generation of the motor under variable working conditions, additional auxiliary cooling methods can be added to adjust the motor temperature to improve the adaptability to variable working conditions. Considering the adaptability to variable working conditions, the auxiliary cooling methods that can be added are: (1) Auxiliary cooling air inlet holes are opened in the motor section housing 12 to introduce normal temperature medium gas on the system pipeline into the motor cavity, mix it with the low-temperature cold air, and cool the motor stator and rotor together. The cooling air flows inside the main engine as follows: Figure 3 As shown in the figure, the red solid arrows represent low-temperature cooling air, and the green solid arrows represent auxiliary cooling air. (2) An interlayer is designed on the outside of the motor segment housing, and a cooling fluid is passed into the interlayer to cool the motor housing and the motor stator. Figure 3 Indicated by the yellow hollow arrow.

[0040] It should be pointed out that the number of stages of the compression end and the expansion end is not limited, and can be single-stage or multi-stage. In the case of multi-stage, the expansion side components are connected in series in the axial direction, and the same is true for the compression side. In some applications, even one of the compression end and the expansion end can be eliminated to form an independent integrated motor type centrifugal compressor or integrated motor type turbine expander.

[0041] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A compression-expansion integrated machine, characterized in that: include: An expansion side casing (3), an expansion side end cover (1), an expansion side casing (2), a guide vane (16), an expansion wheel (4), a shaft (14), a compression side casing (7), a compression side end cover (8), a compression side casing (9), a diffuser (17), a compression wheel (10), an expansion side shaft end seal (5), a compression side shaft end seal (11), a motor section casing (12), a motor stator (13), a temperature control plate (15) and a magnetic suspension bearing (6); The expansion side casing (3), the expansion side end cover (1), the expansion side casing (2), the guide vane (16), the expansion wheel (4) and the expansion side shaft end seal (5) constitute an expansion side component; The compression side housing (7), the compression side end cover (8), the compression side casing (9), the diffuser (17), the compression wheel (10) and the compression side shaft end seal (11) constitute a compression side component; The motor segment housing (12), the motor stator (13), the temperature control plate (15) and the magnetic bearing (6) constitute a motor segment component; One end of the motor segment component is spliced ​​with the expansion side component, and the other end is spliced ​​with the compression side component; The shaft (14) passes through the expansion side component, the motor section component and the compression side component; The expansion wheel (4) is suspended at one end of the shaft (14) and is combined with the expansion side component to form a complete flow-through part of the expander; The compression wheel (10) is suspended at the other end of the shaft (14) and is combined with the compression side component to form a complete compressor flow-through part; The middle section of the shaft (14) is thermally sleeved with a corresponding magnetic steel component (14a) and is combined with the motor section component to form a complete magnetic suspension motor part.

2. The compression-expansion integrated machine according to claim 1, characterized in that: The expansion side shaft end seal (5) and the temperature control plate (15) are used to introduce an appropriate amount of cold energy into the motor cavity to achieve motor cooling.

3. The compression-expansion integrated machine according to claim 2, characterized in that: The cooling capacity includes low-temperature air cooling and low-temperature conduction cooling.

4. The compression-expansion integrated machine according to claim 3, characterized in that: The low-temperature air cooling is achieved through the expansion side shaft end seal (5).

5. The compression-expansion integrated machine according to claim 4, characterized in that: The low-temperature air cooling is achieved through the expansion side shaft end seal (5), including: the expansion side shaft end seal (5) is in the form of a comb tooth labyrinth or a carbon ring.

6. The integrated compression and expansion machine according to claim 3, characterized in that: The low-temperature cooling is achieved through the temperature control plate (15).

7. The integrated compression and expansion machine according to claim 6, characterized in that: The low-temperature cooling is achieved through the temperature control plate (15), including: the temperature control plate (15) is made of a material with a low thermal conductivity coefficient, or a layer of thermal barrier coating is coated on the surface of the structural part to reduce the thermal conductivity coefficient.

8. The integrated compression and expansion machine according to any one of claims 1 to 7, characterized in that: Also includes: Auxiliary cooling method.

9. The integrated compression and expansion machine according to claim 8, characterized in that: The auxiliary cooling method includes opening an auxiliary cooling air inlet hole in the motor segment housing (12), introducing normal temperature medium gas on the system pipeline into the motor cavity, mixing with low temperature cold air, and jointly cooling the motor stator (13).

10. The integrated compression and expansion machine according to claim 8, characterized in that: The auxiliary cooling method includes designing an interlayer on the outside of the motor segment housing (12), and passing a cooling fluid into the interlayer, thereby cooling the motor segment housing (12) and the motor stator (13).

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