A compact split-type in-service self-regulating power exchange gas wave generator

Abstract

A compact split-type in-service self-regulating power exchange gas wave machine belongs to the field of gas wave supercharging technology. This compact split-type in-service self-regulating power exchange gas wave machine adopts three port discs and two-stage rotors arranged inside the machine body, which can effectively improve the expansion ratio while saving space. An air flow channel is set at the connection of the split body, and the flow mode of the fluid in the gas wave machine is designed to be counter-flow. The opposite flow directions of different streams offset part of the axial force, greatly reducing the axial force impact on the bearing. By embedding a driving mechanism inside the two end port discs, the sliding part is driven to move the size of the port on the adjustment port disc, and the port size matching of the power exchange gas wave machine is achieved without stopping the machine, so that it can achieve optimal performance. It is suitable for use under high expansion ratio (>2.25), pressure ratio (>1.5) and unstable operating conditions.

Description

Technical Field

[0001] The invention designs a compact split-type in-service self-regulating power exchange gas wave machine, belonging to the technical field of gas wave supercharging. Background Art

[0002] A work-exchange gas wave generator is an unsteady fluid boosting device that achieves high pressure ratios at low expansion ratios. It features low speed, liquid-carrying operation, self-cooling, and minimal material requirements. It is a core component of power exchange networks in steam utility projects. To operate, the work-exchange gas wave generator relies on shock waves and expansion waves generated within the rotor channels. Its port geometry and position must be precisely matched to operating conditions to achieve high performance under stable operating conditions.

[0003] Existing power exchange wave generators have the problem of a single operating condition. The main parameters such as the size and position of the ports need to be designed according to the specific operating conditions. Good operating performance can be achieved by matching the internal wave system movement with the structure. However, when the operating conditions change, the internally generated movement shock wave or expansion wave will be advanced or delayed, causing the internal expansion wave and shock wave to meet, resulting in backflow at the medium-pressure and low-pressure ports, causing indicators such as the ejection rate to drop rapidly. To address this problem, the most common approach is to use a non-standard design for the power exchange wave generator, changing different port plates and nozzles according to specific operating conditions. If the online operating conditions change, the machine needs to be shut down to replace the above components, which increases operation and maintenance costs.

[0004] Patent document CN2020111088628 discloses a volumetric expansion-driven phase-change wave rotor supercharger, patent document CN2015101390432 discloses a self-driven supercharger with superposition of opposing expansion waves, and CN201610811337X discloses a wave rotor supercharger and an engine having the same. These types of wave rotor superchargers are usually axially disassembled and assembled, making it difficult to accurately axially position bearings, drums, etc., especially when the equipment is large-scale, the assembly accuracy cannot be effectively guaranteed. In addition, the existing three-port power exchange gas wave machine is suitable for working occasions with low expansion ratios. At an expansion ratio of <2.0, it can achieve excellent performance of a compression ratio of 1.25 and an ejection rate of more than 30%. However, its application is limited under working conditions with large expansion ratios and large compression ratios.

[0005] The patent document "A Wave Rotor Multi-stage Refrigerator" (CN2017107667876) proposes a single-rotor structure that uses a multi-port piping connection method to achieve reflux-type multi-stage expansion refrigeration. This method helps reduce the single-stage expansion ratio and improves isentropic refrigeration efficiency. However, this structure is not suitable for power exchange network scenarios where boosting is the goal. The patent document "A Power Exchange Network Implementation Method Based on a Wave Rotor Device" (Publication No. CN114562341A) proposes a working method for a power exchange network but does not mention a typical device structure suitable for this steam power exchange network. Summary of the Invention

[0006] The object of the present invention is to provide a compact split in-service self-regulating power exchange gas wave machine, which can improve the expansion ratio of the power exchange gas wave machine, optimize the axial installation positioning and improve its ability to adapt to multiple working conditions.

[0007] To achieve the above objectives, the present invention adopts a solution: a compact split in-service self-regulating work exchange gas wave generator includes an upper body, a lower body and a wave drum, wherein the wave drum includes a first port plate, a first rotor, a second port plate, a second rotor and a third port plate arranged in sequence between the upper body and the lower body;

[0008] The first port plate and the third port plate each independently comprise a base, a cover plate, a sliding member, and a driving mechanism. The base is provided with two base grooves closed by the cover plates. The base grooves are provided with ports. The sliding members are placed in the ports. The sliding members are driven by the driving mechanism to slide along the ports to adjust the size of the ports.

[0009] The second port plate is provided with a first channel connected to the first rotor and a second channel connected to the second rotor;

[0010] An air flow channel is set at the connection between the upper body and the lower body. One port on the first port disk is connected to the first channel through the air flow channel, and the other port is connected to the second high-pressure channel. The two ports on the third port disk are respectively connected to the first high-pressure channel and the low-pressure channel, and the second channel is connected to the medium-pressure channel; the port on the third port disk on the same side as the second channel is connected to the low-pressure channel, and the port on the same side as the first channel is connected to the first high-pressure channel.

[0011] The compact split in-service self-regulating power exchange gas wave generator has a driving mechanism using a servo motor arranged in a servo motor slot and an elastic element arranged in an elastic element slot. The servo motor is connected to a sliding part through the elastic element to drive the sliding part to change the size of the port.

[0012] The described compact split in-service self-regulating power exchange gas wave generator has a driving mechanism using a stud and a flexible element. The flexible element is arranged in a flexible element groove. The stud is screwed into the sliding part connected to the flexible element through the side of the base, driving the sliding part to change the size of the port.

[0013] The compact split in-service self-regulating power exchange gas wave generator, the temperature sensors, pressure sensors and servo motors arranged on the air flow channel, low pressure channel, first high pressure channel, second high pressure channel and medium pressure channel are connected to the control system.

[0014] The compact split in-service self-regulating power exchange gas wave machine has a split structure, which divides the machine body into an upper body and a lower body, which is conducive to the axial positioning of large-scale equipment.

[0015] In the compact split in-service self-regulating power exchange gas wave machine, the wave drum is driven by a rotating shaft arranged on the machine body, and the first port disk, the second port disk and the third port disk do not rotate with the wave drum.

[0016] The compact split in-service self-regulating power exchange air wave machine realizes the counter-flow of fluid through the arrangement of the first rotor, the second rotor, the air flow channel, the first port plate, the second port plate, and the third port plate, thereby achieving the purpose of secondary pressurization; the size of the ports on the first port plate and the third port plate is adjusted by the driving mechanism, so that the port size matching of the air wave machine is achieved without stopping the machine.

[0017] The sizes of the ports on the first port plate and the third port plate and the sizes of the first channel and the second channel on the second port plate are designed according to actual needs.

[0018] The machine body adopts a split structure, which is convenient for the axial positioning and disassembly of large equipment, and also convenient for the processing of opposing power exchange gas wave machines. The options for rotor and machine body seals are also more diverse.

[0019] Due to the inherent characteristics of the power exchange gas wave generator, its expansion ratio is relatively low, generally around 1.8. When the expansion ratio is greater than 2.2, the ejection effect is not ideal. In order to improve its expansion ratio, the present invention integrates the first rotor and the second rotor on the same shaft, using two drums for secondary supercharging.

[0020] Higher pressure working conditions exert greater axial force on the bearings, which will reduce the service life of the bearings. The present invention designs the flow mode of the power exchange wave generator airflow to be a counter-flow type, and balances part of the axial force through the counter-flow of the fluid in the low-pressure channel, the first high-pressure channel and the second high-pressure channel. Since the flow in the medium-pressure channel needs to change direction, the second port plate is used to cooperate with the flow channels on the two bodies.

[0021] The second port plate is equipped with a primary and secondary channel, each connected to the two rotors. This serves as a shared outlet for the two drums, connecting to the airflow channel and the intermediate-pressure channel within the housing. The diameter of the second port plate is slightly larger than the diameter of the drum, facilitating axial positioning within the housing. The primary and secondary channels are fixed in size; the relative positions of the high-pressure, low-pressure, and intermediate-pressure ports can be adjusted simply by adjusting the port sizes on the first and second port plates.

[0022] The driving mechanism can use a servo motor to pull the sliding member to move, thereby changing the size of the port on the port disk, thereby changing the size of the fluid inlet and outlet ports.

[0023] The driving mechanism can also adopt a driving structure composed of a stud and a flexible element. By screwing the stud in or out, the flexible element is squeezed or stretched, thereby moving the sliding part to change the size of the port on the port disk and adjust the size of the fluid inlet and outlet ports.

[0024] Temperature sensors and pressure sensors are embedded in the inlet and outlet pipes of the air flow. All temperature sensors, pressure sensors, and servo motors on the drive mechanism are connected to the control system. The pressure and temperature sensors are used to transmit pressure and temperature signals to the control system in real time. The control system retrieves the port disk size data of the power exchanger under different working conditions stored in the system, controls the action of the servo motor inside the port disk, retracts or extends the elastic element, and changes the position of the sliding part, thereby controlling the size of the port and the relative position of the high-pressure port, low-pressure port, and medium-pressure port. The position between the high-pressure and low-pressure ports is not significantly affected by fluctuations in the working conditions and is of great significance to the sealing between the two ports, so it is designed to be a fixed length.

[0025] Compared to existing airwave superchargers, the present invention offers the following advantages: This compact, split, in-service, self-regulating power exchange airwave generator, with two rotors strung together within a single body, effectively saves space while simultaneously increasing the expansion ratio through secondary supercharging. Airflow channels are provided at the joints of the split body, designing the fluid flow pattern within the airwave generator to be countercurrent. The opposing flow directions of different streams offset some axial forces, significantly reducing the axial force impact on the bearings and extending the machine's service life, making it suitable for high-pressure operating conditions. By embedding a drive mechanism within the two end port discs, space is saved within the body, ensuring sealing, while driving a sliding member to adjust the size of the ports on the port discs. This allows for port size matching of the power exchange airwave generator without shutting down the machine, achieving optimal performance. This design is suitable for applications with high expansion ratios (>2.25) and pressure ratios (>1.5), as well as for unstable operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 It is a schematic diagram of the internal structure of a compact split-type in-service self-regulating power exchange gas wave generator.

[0028] Figure 2 It is a structural diagram of a compact split-type in-service self-regulating power exchange gas wave machine.

[0029] Figure 3 yes Figure 2 AA section view in.

[0030] Figure 4 yes Figure 2 BB cross-section view in.

[0031] Figure 5 yes Figure 2 CC section view in.

[0032] Figure 6 It is a three-dimensional structural diagram of a first port disk.

[0033] Figure 7 This is a structural diagram of another first port disk.

[0034] Figure 8 This is a structural diagram of the cover.

[0035] Figure 9 This is the main view of the second port disk.

[0036] Figure 10 is a top view of the second port disk.

[0037] Figure 11 This is the left side view of the second port disk.

[0038] Figure 12 This is a structural diagram of the lower body.

[0039] Figure 13 It is a structural diagram of the port width of a compact split in-service self-regulating power exchange gas wave machine.

[0040] Figure 14 The diagram is a flow diagram of a compact split in-service self-regulating power exchange gas wave machine.

[0041] In the figure: 1, upper body, 2, lower body, 3, first port plate, 3a, base, 3a1, base groove, 3a2, port, 3b, cover plate, 3b1, opening, 3c, servo motor, 3c1, elastic element, 3d sliding member, 3e, stud, 3f, flexible element, 4, first rotor, 5, second port plate, 5a, first channel, 5b, second channel, 6, second rotor, 7, third port plate, 8, air flow channel, 9, low-pressure channel, 10, first high-pressure channel, 11, second high-pressure channel, 12, medium-pressure channel, B h , High pressure port size, B l , low pressure port size, B m , Medium pressure port size, B Ɛ , solid wall distance dimension, B θ , medium pressure offset dimensions. DETAILED DESCRIPTION

[0042] A compact split in-service self-regulating power exchange gas wave generator is now further described with reference to the illustrations. Example 1

[0043] Figure 1 and 2 A compact, split, in-service, self-regulating work-exchanging gas wave generator is shown. The figure shows this compact, split, in-service, self-regulating work-exchanging gas wave generator comprising an upper body 1, a lower body 2, and a corrugated drum. The corrugated drum comprises a first port plate 3, a first rotor 4, a second port plate 5, a second rotor 6, and a third port plate 7, arranged in sequence between the upper and lower bodies 1 and 2. The corrugated drum is driven by a rotating shaft mounted on the body, while the first, second, and third port plates 3, 5, and 7 are stationary.

[0044] The first port plate 3 comprises a base 3a, a cover 3b, a sliding member 3d and a driving mechanism. Two base grooves 3a1 are symmetrically provided on the base 3a. Each base groove 3a1 is provided with an arcuate port 3a2. The arcuate sliding member 3d is inserted into the port 3a2 and slides along the port 3a2 under the drive of the driving mechanism. The cover 3b is provided on the base groove 3a1. An arcuate opening 3b1 (such as Figure 6 and 8 As shown in FIG), the thickness of the cover plate 3b is the same as the depth of the base groove 3a1. The third port plate 7 and the first port plate 3 adopt the same structure (as shown in FIG). Figure 5 and 8 shown).

[0045] The driving mechanism includes a servo motor 3c installed in the servo motor slot and an elastic element 3c1 installed in the elastic element slot. The servo motor 3c is connected to the sliding member 3d through the elastic element 3c1. The servo motor slot and the elastic element slot are both located on the base slot 3a1. The elastic element 3c1 is a spring. The servo motor 3c is connected to the spring through a wire rope (such as Figure 3 and 4 shown).

[0046] The second port plate 5 is provided with a first channel 5a communicating with the first rotor 4 and a second channel 5b communicating with the second rotor 6 (eg, Figure 4 、 9 -11).

[0047] The connection between the upper body 1 and the lower body 2 is provided with an air flow channel 8 (such as Figure 1 and 2 As shown, one port 3a2 on the first port disk 3 periodically connects to the first rotor 4 via the airflow channel 8 and the first channel 5a. Another port 3a2 on the first port disk 3 connects to the second high-pressure channel 11, and the second channel 5b connects to the medium-pressure channel 12. The port 3a2 on the third port disk 7 on the same side as the second channel 5b connects to the low-pressure channel 9, and the port 3a2 on the same side as the first channel 5a connects to the first high-pressure channel 10.

[0048] The temperature sensors, pressure sensors and servo motor 3 c provided on the air flow channel 8 , the low pressure channel 9 , the first high pressure channel 10 , the second high pressure channel 11 and the medium pressure channel 12 are connected to the intelligent control system.

[0049] For a counter-flow, high-expansion-ratio work-exchanger, airflow channels 8 must be machined into the upper and lower housings 1 and 2. During assembly of the port plate, the elastic element is compressed, held in place by a sliding member, and finally secured with a cover plate. The sliding member within the adjustable port plate slides circumferentially, adjusting the port size. Figure 13 The port size is shown in two dimensions along the rotor channel mid-diameter distance, mainly including the high-pressure port size B h , the solid wall distance B between the high and low pressure ports Ɛ , low pressure port size B l , medium pressure port offset distance B θ and medium pressure port size B m The optimal port size under different expansion ratios and pressure ratios is calculated by CFD, and the distance B between two ports on the same port plate is ƐGenerally unchanged, with little effect on parameters such as the ejection rate, and the size of the medium-pressure port does not change much. Therefore, the distance between the two ports on the port disk of the present invention is set to be non-adjustable, and this design is conducive to sealing. The cover plate 3b is responsible for axial sealing, which can be close to the nozzle to avoid gas leakage between the two ports connected by the port disk to the greatest extent. The elastic element 3c1 is always in a compressed state, providing a force to close the sliding part 3d. The servo motor 3c and the elastic element are connected by a steel wire rope, and the servo motor pulls the steel wire rope to generate a pulling force on the sliding part. It is only necessary to control the servo motor to retract the steel wire rope to accurately control the position of the sliding part and then adjust the size of the port. Since the sliding part is subjected to less force in the circumferential direction, a micro servo motor can be used to make the port disk occupy a smaller space in the rotor body.

[0050] The working process of this compact split in-service self-regulating power exchange gas wave machine is as follows: the high-pressure stream HP1 enters the first high-pressure channel 10, and the low-pressure stream LP1 enters the low-pressure channel 9. After the two streams enter the nozzle, they pass through the ports of the third port disk 7 controlled and regulated by the control system, enter the second rotor 6 to interact with each other, and after completing the wave system interaction, they become the MP1 stream, and enter the air flow channel 8 through the first channel 5a on the second port disk 5. The high-pressure stream HP2 passes through the second high-pressure channel 11 and the port on the first port disk 3 in turn and enters the first rotor 4. Inside the rotor channel, it undergoes wave system interaction with the MP1 stream entering from the air flow channel 8, supercharging it to form the medium-pressure stream MP2, which is discharged through the second channel 5b and the medium-pressure channel 12 (as shown in FIG. Figure 1 and 14 shown).

[0051] The intelligent control system stores port dimensions for different operating conditions calculated using CFD, allowing real-time adjustments based on operating conditions. It also allows for a certain degree of fine-tuning to correct port dimension data for different operating conditions. Example 2

[0052] Figure 1 and 2 A compact, split, in-service, self-regulating work-exchanging gas wave generator is shown. The figure shows this compact, split, in-service, self-regulating work-exchanging gas wave generator comprising an upper body 1, a lower body 2, and a corrugated drum. The corrugated drum comprises a first port plate 3, a first rotor 4, a second port plate 5, a second rotor 6, and a third port plate 7, arranged in sequence between the upper and lower bodies 1 and 2. The corrugated drum is driven by a rotating shaft mounted on the body, while the first, second, and third port plates 3, 5, and 7 are stationary.

[0053] The first port plate 3 comprises a base 3a, a cover 3b, a sliding member 3d and a driving mechanism. Two base grooves 3a1 are symmetrically provided on the base 3a. Each base groove 3a1 is provided with a port 3a2. The sliding member 3d is inserted into the port 3a2 and slides along the port 3a2 under the drive of the driving mechanism 3c. The cover 3b is provided on the base groove 3a1. An arc-shaped opening 3b1 (such as Figure 8 As shown in FIG, the thickness of the cover plate 3b is the same as the depth of the base groove 3a1. The third port plate 7 and the first port plate 3 adopt the same structure.

[0054] The driving mechanism includes a stud 3e and a flexible element 3f. The flexible element 3f is arranged in the flexible element groove. The stud 3e is screwed into the body from the side, the base 3a is connected to the sliding member 3d (such as Figure 7 shown).

[0055] The second port plate 5 is provided with a first channel 5a communicating with the first rotor 4 and a second channel 5b communicating with the second rotor 6 (eg, Figure 4 、 9 -11).

[0056] The connection between the upper body 1 and the lower body 2 is provided with an air flow channel 8 (such as Figure 1 and Figure 2 As shown, one port 3a2 on the first port disk 3 is connected to the first rotor 4 via the airflow channel 8 and the first channel 5a. The port 3a2 on the third port disk 7 on the same side as the second channel 5b is connected to the low-pressure channel 9, and the port 3a2 on the same side as the first channel 5a is connected to the first high-pressure channel 10. Another port 3a2 on the first port disk 3 is connected to the second high-pressure channel 11, and the second channel 5b is connected to the medium-pressure channel 12.

[0057] The temperature sensors and pressure sensors provided on the air flow channel 8, the low pressure channel 9, the first high pressure channel 10, the second high pressure channel 11, and the medium pressure channel 12 are connected to the intelligent control system.

[0058] A mechanical structure is used to connect the flexible transmission member through a stud 3e outside the body. By turning the stud, the advancement or retreat of the flexible transmission member is controlled, thereby controlling the movement of the sliding member.

Claims

1. A compact split-type in-service self-regulating power exchange gas wave machine, comprising an upper machine body (1), a lower machine body (2) and a wave drum, characterized in that: The corrugated drum comprises a first port disc (3), a first rotor (4), a second port disc (5), a second rotor (6) and a third port disc (7) which are sequentially arranged between an upper body (1) and a lower body (2); The first port disk (3) and the third port disk (7) each independently comprise a base (3a), a cover plate (3b), a sliding member (3d) and a driving mechanism; the base (3a) is provided with two base grooves (3a1) closed by the cover plate (3b); the base groove (3a1) is provided with a port (3a2); the sliding member (3d) is placed in the port (3a2); and the sliding member (3d) is driven by the driving mechanism to slide along the port (3a2) to adjust the size of the port (3a2); The second port disk (5) is provided with a first channel (5a) communicating with the first rotor (4) and a second channel (5b) communicating with the second rotor (6); An air flow channel (8) is provided at the connection between the upper body (1) and the lower body (2); one port (3a2) on the first port plate (3) is connected to the first channel (5a) through the air flow channel (8); the other port (3a2) is connected to the second high-pressure channel (11); the two ports (3a2) on the third port plate (7) are respectively connected to the first high-pressure channel (10) and the low-pressure channel (9); the second channel (5b) is connected to the medium-pressure channel (12); the port (3a2) on the third port plate (7) on the same side as the second channel (5b) is connected to the low-pressure channel (9), and the port (3a2) on the same side as the first channel (5a) is connected to the first high-pressure channel (10).

2. A compact split in-service self-regulating power exchange gas wave generator according to claim 1, characterized in that: The driving mechanism adopts a servo motor (3c) arranged in a servo motor slot and an elastic element (3c1) arranged in an elastic element slot; the servo motor (3c) is connected to a sliding member (3d) via the elastic element (3c1), and drives the sliding member (3d) to change the size of the port (3a2).

3. A compact split in-service self-regulating power exchange gas wave generator according to claim 1, characterized in that: The driving mechanism adopts a stud (3e) and a flexible element (3f). The flexible element (3f) is arranged in a flexible element groove. The stud (3e) is screwed into the side of the base (3a) and connected to the sliding member (3d) through the flexible element (3f), driving the sliding member (3d) to change the size of the port (3a2).

4. A compact split in-service self-regulating power exchange gas wave generator according to claim 1, characterized in that: The temperature sensors, pressure sensors, flow sensors provided on the air flow channel (8), the low-pressure channel (9), the first high-pressure channel (10), the second high-pressure channel (11), and the medium-pressure channel (12), as well as the position sensors on the servo motor (3c) and the sliding member (3d) are connected to a control system.

5. A compact split in-service self-regulating power exchange gas wave generator according to claim 1, characterized in that: The corrugated drum is driven by a rotating shaft provided on the machine body, and the first port disc (3), the second port disc (5) and the third port disc (7) do not rotate along with the corrugated drum.

6. A compact split in-service self-regulating power exchange gas wave generator according to claim 1, characterized in that: The air wave machine realizes counter-flow of the fluid through the arrangement of the first rotor (4), the second rotor (6), the air flow channel (8), the first port plate (3), the second port plate (5), and the third port plate (7), thereby achieving the purpose of secondary pressurization; The sizes of the ports (3a2) on the first port disk (3) and the third port disk (7) are adjusted by the driving mechanism, thereby achieving port size matching of the power exchange gas wave machine without stopping the machine.

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