Green Ring Air Conditioning Low-Pressure Turbine Mechanism

Abstract

The present invention discloses a low-pressure turbine mechanism for a green-ring air conditioner, comprising a conical volute and an aerodynamic cone turbine connected to each other in a rotational manner; an aerodynamic cone turbine chamber is provided within the conical volute, and a power gas inlet is provided on the conical volute, which is tangentially connected thereto; the aerodynamic cone turbine comprises a turbine shaft for outputting power, on which a turbine impact impeller, a turbine cone body, and vortex dispersion vanes are axially arranged in sequence, and the three are connected at the middle; a conical impeller is also provided within the turbine cone body; the turbine impact impeller is located within the aerodynamic cone turbine chamber; the gas discharged from the vortex dispersion vanes flows in the opposite direction to that of the aerodynamic cone turbine and has a comparable linear velocity. The low-pressure turbine mechanism for a green-ring air conditioner provided by the present invention can be used with green-ring air conditioners while reducing energy loss and significantly improving the efficiency of converting gas kinetic energy into mechanical energy.

Description

Technical Field

[0001] The present invention relates to the field of low-pressure turbines, and in particular to a low-pressure turbine mechanism for a green-ring air conditioner. Background Art

[0002] The "Green Ring Air Conditioning" project involved in patent technologies such as patent application numbers 2021113567369, 2021113580630, and 2021113567373 has passed simulation and mathematical research at Tsinghua University (R&D reports can be provided).

[0003] After equipping the "Green Ring Air Conditioning" project with its low-pressure turbine mechanism and conducting mathematical research, we found that:

[0004] 1) A low-pressure turbine mechanism compatible with the "Green Ring Air Conditioner" structure could not be found. If the existing low-pressure turbine mechanism must be used, the "Green Ring Air Conditioner" structure would need to be significantly modified, which would go against the original intention and would not be worth the cost.

[0005] 2) Due to the first reason, the original "Green Ring Air Conditioner" design adopted existing general technology and designed a dedicated low-pressure turbine mechanism based on the characteristics of the "Green Ring Air Conditioner". However, the energy conversion efficiency remained at the current level:

[0006] The efficiency of converting low-pressure gas energy into mechanical energy is generally around 75%. The main energy losses are gas leakage and impact between the turbine and the casing, about -15%, tail vortex, about -5%, and other losses, about -5%.

[0007] The above research findings indicate that, if modifications to the Green Ring Air Conditioner's structure are necessary, using an existing low-pressure turbine mechanism on the market would be an undesirable option. However, these are difficult to find and their efficiency is unsatisfactory. After comprehensive consideration, it became necessary to develop an advanced low-pressure turbine mechanism suitable for the Green Ring Air Conditioner. Summary of the Invention

[0008] The purpose of the present invention is to provide a low-pressure turbine mechanism for a green-ring air conditioner, which can be used with a green-ring air conditioner while reducing energy loss and significantly improving the energy conversion rate of gas kinetic energy into mechanical energy.

[0009] To achieve the above-mentioned objectives, the present invention provides a green-ring air-conditioning low-pressure turbine mechanism, comprising a conical volute and an aerodynamic cone turbine connected to each other in rotation; an aerodynamic cone turbine chamber is provided in the conical volute, and a power gas air inlet connected tangentially thereto is provided on the conical volute; the aerodynamic cone turbine comprises a turbine shaft for outputting power, on which a turbine impact impeller, a turbine cone body and a vortex dispersion vortex vane are sequentially provided along the axial direction, and the three are connected in the middle; a conical impeller is also provided in the turbine cone body; the turbine impact impeller is located in the aerodynamic cone turbine chamber; the gas discharged from the vortex dispersion vortex vane flows in a direction opposite to that of the aerodynamic cone turbine and has a comparable linear velocity.

[0010] As a further improvement of the present invention, the turbine chamber of the pneumatic cone pot is connected to a partition wall surrounding the outside of the turbine impact impeller, and the partition wall is provided with at least two vortex nozzles facing the outside of the turbine impact impeller around its center; an annular air duct is formed between the partition wall and the inner wall of the turbine chamber of the pneumatic cone pot; and a compression vortex whose cross-sectional area gradually decreases along the gas flow direction is also provided between the annular air duct and the power gas inlet.

[0011] As a further improvement of the present invention, a first turbine cover plate is connected to the side of the turbine impact impeller away from the turbine cone pot body; a second turbine cover plate is connected to the side of the vortex dispersion vane away from the turbine cone pot body.

[0012] As a further improvement of the present invention, a bearing seat is provided on the conical volute casing, a bearing cavity connected to the turbine cavity of the pneumatic cone pot is provided on the bearing seat, and a bearing in contact with the first turbine cover plate is provided in the bearing cavity; an axial hole connected to the bearing cavity is provided on the bearing seat, and the turbine shaft passes through the bearing and the axial hole; a lubrication cavity is provided on the middle side wall of the axial hole, and the lubrication cavity is connected to the outer wall of the bearing seat through an oil filling hole.

[0013] As a further improvement of the present invention, the conical volute includes a conical pot shell that rotates with the turbine cone pot body; a sealing ring is provided between the inner end surface of the conical pot shell and the outer end surface of the turbine cone pot body; the sealing ring is a polytetrafluoroethylene ring.

[0014] As a further improvement of the present invention, the cross-sectional size of the turbine cone body gradually decreases from the turbine impact impeller to the vortex dispersion vane.

[0015] As a further improvement of the present invention, a transmission gear is connected to the turbine shaft.

[0016] The turbine impact impeller, the conjoined impeller and the vortex dispersion vane have the same blade rotation direction.

[0017] Beneficial effects

[0018] Compared with the prior art, the advantages of the green ring air conditioner low-pressure turbine mechanism of the present invention are:

[0019] 1. The motive gas flows from the motive gas inlet at a velocity of V1, passes through the compression vortex and vortex nozzle, and is compressed and accelerated to V2. It then enters and impacts the turbine impeller, driving the aerodynamic cone turbine. The motive gas forms a vortex within the cone cavity, decelerating, and impacts the integrated impeller again before flowing through the turbine diffuser vanes and exiting in the opposite direction of the aerodynamic cone turbine's rotation, at a comparable linear velocity. This means that the motive gas's velocity relative to the outside world is virtually zero upon exit. Because the motive gas's velocity relative to the outside world is virtually zero upon exit, the kinetic energy of the motive gas is largely absorbed by the aerodynamic cone turbine, converting it into mechanical energy for the turbine shaft. This three-stage energy absorption and conversion process (turbine impeller, integrated impeller, and turbine diffuser vanes) achieves a reduced mechanism size, higher efficiency, and lower noise. Theoretically, the energy conversion rate of the Green Ring Air Conditioning low-pressure gas cone turbine mechanism can reach approximately 90%.

[0020] 2. Since the conical volute is fixed, while the pneumatic cone turbine rotates rapidly, preventing gas from leaking through the micro-gap between the conical volute and the pneumatic cone turbine and reducing friction loss between them is a challenge. To this end, two polytetrafluoroethylene (PTFE) rings are installed between the conical volute and the pneumatic cone turbine and injected with lubricating oil, which effectively prevents leakage and reduces friction loss. PTFE rings have excellent self-lubrication properties and excellent performance in terms of temperature resistance, wear resistance, and strength. Combined with the presence of lubricating oil, the friction loss between the conical volute and the pneumatic cone turbine is also extremely small.

[0021] 3. This low-pressure turbine mechanism is not only very suitable for use in "Green Ring Air Conditioning" in terms of structure and technical performance, but also eliminates the two major energy loss problems of gas leakage and collision between the turbine and the casing, and tail vortex in existing general technologies.

[0022] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a top view of the low-pressure turbine mechanism of the Green Ring air conditioner;

[0025] Figure 2 This is the main view of the low-pressure turbine mechanism of the Green Ring air conditioner;

[0026] Figure 3 for Figure 1 AA section view;

[0027] Figure 4 for Figure 2 BB cross-sectional view;

[0028] Figure 5 This is the main sectional view of the conical volute;

[0029] Figure 6 It is a top sectional view of the conical volute;

[0030] Figure 7 This is the main view of the pneumatic cone turbine;

[0031] Figure 8 This is a front sectional view of the pneumatic cone turbine;

[0032] Figure 9 for Figure 7 CC cross-sectional view;

[0033] Figure 10 for Figure 7 DD cross-sectional view;

[0034] Figure 11 Schematic diagram of gas flow. DETAILED DESCRIPTION

[0035] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] Example

[0037] The specific embodiments of the present invention are as follows Figures 1 to 11 As shown, a green ring air-conditioning low-pressure turbine mechanism includes a conical volute 1 and an aerodynamic conical pot turbine 2 that are rotatably connected to each other. An aerodynamic conical pot turbine chamber 13 is provided in the conical volute 1, and a power gas air inlet 14 that is tangentially connected to the conical volute 1 is provided on the conical volute 1. The aerodynamic conical pot turbine 2 includes a turbine shaft 21 for outputting power, and a turbine impact impeller 22, a turbine cone body 24 and a vortex dispersion vane 28 are sequentially provided on the turbine shaft 21 along the axial direction, and the three are connected in the middle. A conical impeller 26 is also provided in the turbine cone body 24. The turbine impact impeller 22 is located in the aerodynamic conical pot turbine chamber 13. The direction of the gas discharged from the vortex dispersion vane 28 is opposite to the direction of rotation of the aerodynamic conical pot turbine 2 and the linear velocity is comparable.

[0038] There are multiple vortex diffuser blades 28 arranged around the turbine shaft 21, with exhaust ports 281 formed between adjacent vortex diffuser blades 28. The exhaust ports 281 are located on the outer circumferential surface of the impeller formed by the multiple vortex diffuser blades 28.

[0039] The pneumatic cone pot turbine chamber 13 is connected to a partition wall 131 surrounding the outside of the turbine impact impeller 22. The partition wall 131 is provided with at least two vortex nozzles 16 facing the outside of the turbine impact impeller 22 around its center. An annular air duct is formed between the partition wall 131 and the inner wall of the pneumatic cone pot turbine chamber 13. A compressed air vortex 15 whose cross-sectional area gradually decreases along the gas flow direction is also provided between the annular air duct and the power gas inlet 14. In this embodiment, there are six vortex nozzles 16, and the angle between the direction of each vortex nozzle 16 and the air flow direction of the annular air duct at that location is an acute angle.

[0040] A first turbine cover plate 23 is connected to the side of the turbine impeller 22 away from the turbine cone body 24. A second turbine cover plate 27 is connected to the side of the vortex dispersion vanes 28 away from the turbine cone body 24. The second turbine cover plate 27 ensures that the power airflow is discharged only from the outside of the vortex dispersion vanes 28.

[0041] The conical volute 1 is provided with a bearing seat 111. This bearing seat 111 defines a bearing cavity 1114 that communicates with the aerodynamic cone turbine cavity 13. Bearing cavity 1114 houses a bearing 5 that contacts the first turbine cover plate 23. A shaft hole 1111 is provided in the bearing seat 111, communicating with the bearing cavity 1114. The turbine shaft 21 passes through the bearing 5 and shaft hole 1111. A lubrication cavity 1112 is provided on the sidewall of the central portion of shaft hole 1111. This lubrication cavity 1112 communicates with the outer wall of the bearing seat 111 via an oil injection hole 1113, allowing lubrication by injecting lubricating oil.

[0042] The conical volute 1 includes a conical pot shell 121 that rotates with the turbine cone pot body 24. A sealing ring 6 is provided between the inner end surface of the conical pot shell 121 and the outer end surface of the turbine cone pot body 24. The sealing ring 6 is a polytetrafluoroethylene ring. In this embodiment, the outer end surface of the turbine cone pot body 24 is perpendicular to the axis of the turbine shaft 21, and two concentrically arranged first semicircular annular grooves 241 with different diameters are provided on the outer end surface of the turbine cone pot body 24. The inner end surface of the second volute 12 of the conical pot shell 121 is perpendicular to the axis of the turbine shaft 21 and is arranged opposite to the outer end surface of the turbine cone pot body 24, and two concentrically arranged second semicircular annular grooves 122 with different diameters are provided on the inner end surface of the second volute 12, and a polytetrafluoroethylene ring is provided between each two corresponding first semicircular annular grooves 241 and the second semicircular annular grooves 122, that is, there are two polytetrafluoroethylene rings.

[0043] The conical volute 1 includes a first volute 11 and a second volute 12 that are interlocked, and the flange plates on the outer edges of the interlocking surfaces of the two are connected by bolts 4. The aerodynamic cone pot turbine chamber 13 is located between the inner walls of the first volute 11 and the second volute 12. The bearing seat 111 is arranged on the volute cover 112 of the first volute 11, the cone pot shell 121 is arranged on the second volute 12, and an aerodynamic cone pot turbine through-hole 17 is provided at one end of the second volute 12. The turbine cone pot body 24 includes a cone cylinder section and a straight cylinder section connected in sequence along the airflow direction, the cone cylinder section of the turbine cone pot body 24 cooperates with the inner conical surface of the cone pot shell 121, and the straight cylinder section of the turbine cone pot body 24 passes through the aerodynamic cone pot turbine through-hole 17.

[0044] The cross-sectional size of the turbine cone body 24 gradually decreases from the turbine impact impeller 22 toward the vortex dispersion vane 28 .

[0045] The turbine shaft 21 is connected to a transmission gear 3. In addition, a pulley may also be connected.

[0046] The turbine impeller 22, the integrated impeller 26 and the vortex diffuser vane 28 have the same blade rotation direction. The multiple blades of the integrated impeller 26 are arranged in a spiral shape along the axial direction.

[0047] During operation, the motive gas flows from the motive gas inlet 14 through the compression vortex 15 and the vortex nozzle 16 at a speed of V1, is compressed and accelerated to V2, and then enters and impacts the turbine impeller 22, driving the pneumatic cone turbine 2 to rotate. The motive gas forms a vortex in the cone cavity 25 and decelerates, and then impacts the integrated impeller 26 again, then flows through the turbine diffuser vanes 28 and is discharged from the exhaust port 281. Its discharge direction is opposite to the rotation direction of the pneumatic cone turbine 2, and its linear velocity is equivalent, that is, the flow velocity of the motive gas relative to the outside is almost zero when it is discharged, as shown in FIG. Figure 11 As shown in the figure, since the velocity of the motive gas relative to the outside is almost zero during discharge, the kinetic energy of the motive gas is largely absorbed by the pneumatic cone turbine 2 and converted into mechanical energy by the turbine shaft. This three-stage energy absorption and conversion (turbine impact impeller 22, integrated impeller 26, and turbine diffuser vanes 28) achieves a smaller mechanism, higher efficiency, and lower noise.

[0048] According to the law of conservation of energy:

[0049] Q 出 =Q 入 -Q 排 -Q w

[0050] Q 出 ——Net output mechanical energy

[0051] Q 入 ——Input airflow energy

[0052] Q排 ——The residual energy of the exhaust air flow is related to the exhaust port design and can be controlled within 2%.

[0053] Q w ——Micro-loss energy such as gas leakage, compressed air duct wind resistance, and bearing friction can be controlled within 5%.

[0054] It can be seen from the above formula that the energy conversion rate of the low-pressure gas cone turbine mechanism of Green Ring Air Conditioner can theoretically reach about 90%.

[0055] Related calculation formula:

[0056] (1) Gas pressure and velocity conversion formula:

[0057] V 2 =200g(P1-P2)

[0058] Where: V——jet speed (m / s)

[0059] g——acceleration due to gravity 9.8 (N / Kg)

[0060] P1——pressure (mpa)

[0061] P2——pressure (mpa)

[0062] (2) Relationship between airflow area and velocity at the same pressure:

[0063] S1 / S2=V2 / V1

[0064] Where: S1——air flow section 1 (m2)

[0065] S2——air flow section 1 (m2)

[0066] V1——air velocity flowing through section 1 (m / s)

[0067] V2——air velocity flowing through section 2 (m / s)

[0068] Taking some calculation results of the "Low-pressure Cone Turbine Parameter Calculation Table" as an example, the details are as follows:

[0069] Low-pressure cone turbine parameter calculation table

[0070]

[0071]

[0072]

[0073] From the above calculations, it can be seen that the energy conversion rate of the "Green Ring Air Conditioning Low-pressure Gas Cone Pot Turbine Mechanism" can reach about 90%.

[0074] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A low-pressure turbine mechanism for a green-ring air conditioner, characterized in that: The invention comprises a conical volute (1) and an aerodynamic conical pot turbine (2) which are connected to each other in a rotational manner; an aerodynamic conical pot turbine chamber (13) is provided in the conical volute (1), and a power gas air inlet (14) which is tangentially connected to the conical volute (1); the aerodynamic conical pot turbine (2) comprises a turbine shaft (21) for outputting power, and a turbine impact impeller (22), a turbine conical pot body (24) and a vortex dispersion vane (28) are sequentially provided on the turbine shaft (21) along the axial direction, and the three are connected at the middle part; the turbine conical pot body ( 24) is also provided with a conjoined impeller (26); the turbine impact impeller (22) is located in the turbine chamber (13) of the pneumatic cone pot; the flow direction of the gas discharged from the vortex dispersion swirl vane (28) is opposite to the rotation direction of the pneumatic cone pot turbine (2) and the linear velocity is equivalent; the cross-sectional size of the turbine cone pot body (24) gradually decreases from the turbine impact impeller (22) to the vortex dispersion swirl vane (28); the blade rotation direction of the turbine impact impeller (22), the conjoined impeller (26) and the vortex dispersion swirl vane (28) is the same.

2. A green ring air conditioner low-pressure turbine mechanism according to claim 1, characterized in that: The pneumatic cone pot turbine chamber (13) is connected to a partition wall (131) surrounding the outer side of the turbine impact impeller (22); the partition wall (131) is provided with at least two vortex nozzles (16) facing the outer side of the turbine impact impeller (22) around its center; an annular air duct is formed between the partition wall (131) and the inner wall of the pneumatic cone pot turbine chamber (13); and a compressed air vortex (15) whose cross-sectional area gradually decreases along the gas flow direction is further provided between the annular air duct and the power gas inlet (14).

3. A green ring air conditioner low-pressure turbine mechanism according to claim 1, characterized in that: A first turbine cover plate (23) is connected to the side of the turbine impact impeller (22) away from the turbine cone pot body (24); and a second turbine cover plate (27) is connected to the side of the vortex dispersion vane (28) away from the turbine cone pot body (24).

4. A green ring air conditioner low-pressure turbine mechanism according to claim 3, characterized in that: The conical volute (1) is provided with a bearing seat (111), the bearing seat (111) is provided with a bearing cavity (1114) communicating with the turbine cavity (13) of the pneumatic cone pot, and a bearing (5) in contact with the first turbine cover plate (23) is provided in the bearing cavity (1114); the bearing seat (111) is provided with an axial hole (1111) communicating with the bearing cavity (1114), and the turbine shaft (21) passes through the bearing (5) and the axial hole (1111); a lubrication cavity (1112) is provided on the side wall of the middle portion of the axial hole (1111), and the lubrication cavity (1112) is communicated with the outer wall of the bearing seat (111) via an oil injection hole (1113).

5. A green ring air conditioner low-pressure turbine mechanism according to claim 4, characterized in that: The conical volute (1) comprises a conical pot shell (121) rotatably matched with a turbine conical pot body (24); a sealing ring (6) is provided between the inner end surface of the conical pot shell (121) and the outer end surface of the turbine conical pot body (24); and the sealing ring (6) is a polytetrafluoroethylene ring.

6. A green ring air conditioner low-pressure turbine mechanism according to claim 1, characterized in that: The turbine shaft (21) is connected to a transmission gear (3).

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