A multi-chamber static pressure gas bearing for a Stirling generator

Abstract

A multi-chamber static pressure gas bearing of a Stirling generator comprises a static pressure gas bearing cylinder, a static pressure gas bearing cover and a reed valve, the static pressure gas bearing cover comprises a bottom cover and a connecting rod, the connecting rod is a hollow structure, one end of the gas bearing cylinder is open, and the other end is provided with a bottom plate, the bottom plate is provided with a connecting rod assembly hole, the static pressure gas bearing cover is assembled on the open end of the gas bearing cylinder, the chamber between the connecting rod and the static pressure gas bearing cylinder is evenly divided into N pressure storage chambers by N partitions, the bottom cover is provided with N air inlet holes, the air inlet holes are connected with the corresponding pressure storage chambers, the side wall of the gas bearing cylinder is provided with N groups of throttle holes, each group of throttle holes is connected with the corresponding pressure storage chamber; each pressure storage chamber is provided with a reed valve, and each reed valve is located at the corresponding air inlet hole. The present invention distributes air supply through multiple pressure storage chambers, and each group of throttle holes uses a separate pressure storage chamber for air supply. By adjusting the air supply pressure, asymmetric loads can be balanced and load balancing ability can be improved.

Description

Technical Field

[0001] The invention relates to a static pressure gas bearing of a Stirling generator, in particular to a multi-chamber static pressure gas bearing of a Stirling generator. Background Art

[0002] The hydrostatic gas bearing in the Stirling generator is a high-performance bearing technology that uses compressed gas to form a supporting force. Compared with traditional mechanical bearings, the hydrostatic gas bearing has the advantages of non-contact, no lubrication, high precision and low vibration, which is very suitable for the high-efficiency energy conversion needs of the Stirling generator. Stirling generators usually work under high temperature and high pressure conditions. The operating stability of its key components is crucial to the overall efficiency and life. The non-contact design of the hydrostatic gas bearing not only reduces friction loss, but also significantly improves the reliability and life of the system. The hydrostatic gas bearing technology is gradually becoming the core solution for Stirling generators to improve performance and adapt to harsh working conditions.

[0003] The static pressure gas bearing structure in the Stirling generator mainly includes a one-way valve and a throttle hole. The one-way valve is used to intercept the high-pressure gas in the compression chamber of the Stirling generator and enter the pressure storage chamber in the gas bearing. The high-pressure gas in the pressure storage chamber is blown into the gap between the outer surface of the static pressure gas bearing and the inner wall of the cylinder through the throttle hole to form an air film, thereby achieving a gas lubrication effect. The specific principle is that in a Stirling generator, a linear motor is connected to a power piston and placed in a cylinder. Ideally, when the axes of the linear motor stator and mover, the power piston and the cylinder coincide, the reciprocating motion of the power piston in the cylinder will achieve zero friction. However, due to processing errors and assembly coaxiality errors, the power piston is offset, resulting in an uneven gap between the power piston and the cylinder. The hydrostatic gas bearing technology is introduced on the power piston. For the side with a large gap, the gas flow rate ejected from the throttle hole is large and the static pressure generated is small, while for the side with a small gap, the gas flow rate ejected from the throttle hole is small and the static pressure generated is large, thereby generating a pressure difference. The pressure difference generates a reverse bearing force relative to the offset direction of the power piston, so that the power piston returns to a balanced position and the power piston is floated, that is, the load balancing ability of the hydrostatic gas bearing for asymmetric loads.

[0004] When the asymmetric load is too large due to the different placement positions of the Stirling generator, processing errors, and assembly coaxiality errors, the hydrostatic gas bearing is required to have a large load balancing capacity to suppress the imbalance and instability of the hydrostatic gas bearing caused by the asymmetric load. The traditional hydrostatic gas bearing pressure storage chamber adopts a single cavity structure, and the pressure storage chamber uniformly supplies air to all throttle holes. Its load balancing capacity is limited. When the asymmetric load is too large and exceeds its load balancing capacity, the hydrostatic gas bearing will become unbalanced and unstable. In severe cases, the "air hammer" phenomenon will occur, resulting in the performance degradation or even shutdown of the Stirling generator, as well as serious wear of the linear motor, power piston, and cylinder. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a multi-chamber hydrostatic gas bearing for a Stirling generator, which distributes gas supply and adjusts the gas supply pressure through multiple pressure storage chambers, thereby effectively balancing the asymmetric load of the hydrostatic gas bearing and improving the load balancing ability of the hydrostatic gas bearing.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a multi-chamber static pressure gas bearing of a Stirling generator, including a static pressure gas bearing cylinder, a static pressure gas bearing cover and a reed valve, the static pressure gas bearing cover includes a bottom cover and a connecting rod, the connecting rod is a hollow structure, the center of the bottom cover has a hole, the connecting rod is assembled on the center hole of the bottom cover, the gas bearing cylinder is a hollow structure, one end of the gas bearing cylinder is open, and the other end is provided with a bottom plate, the bottom plate has a connecting rod assembly hole, the static pressure gas bearing cover is assembled on the open end of the gas bearing cylinder, and the connecting rod is assembled on the bottom plate. The connecting rod extends into the connecting rod assembly hole, and the chamber between the connecting rod and the static pressure gas bearing cylinder is evenly divided into N pressure storage chambers by N partitions. The bottom cover is provided with N air inlet holes, each air inlet hole corresponds to a pressure storage chamber one by one, and the air inlet holes are connected with the corresponding pressure storage chamber. The side wall of the gas bearing cylinder is provided with N groups of throttle holes along the circumferential direction, each group of throttle holes corresponds to each pressure storage chamber, and each group of throttle holes is connected with the corresponding pressure storage chamber; a reed valve is provided in each pressure storage chamber, and the reed valve corresponds to the air inlet hole one by one, and each reed valve is located at the corresponding air inlet hole.

[0007] Furthermore, the partition includes an arc block, a first partition body, a second partition body and a partition base. The first partition body and the second partition body are arranged on both sides of the arc block. The partition base is located at the end of the arc block and connects the first partition body and the second partition body. The inner diameter of the arc block is adapted to the outer diameter of the connecting rod. N partitions are enclosed around the connecting rod to divide the chamber between the connecting rod and the static pressure gas bearing cylinder into N pressure storage chambers.

[0008] Furthermore, a limiting groove is provided on the bottom surface of the partition base, and N limiting bosses are evenly provided on the bottom plate of the gas bearing cylinder, and the limiting groove of each partition base is engaged in the corresponding limiting boss.

[0009] Furthermore, N ≥2.

[0010] Furthermore, N=2-12.

[0011] Furthermore, the throttling hole has a diameter of 0.1 mm to 0.2 mm.

[0012] Furthermore, the number of throttling holes in each group is two, and the throttling holes are arranged in a two-row N-column structure.

[0013] Furthermore, the air inlet hole is located directly below the corresponding pressure storage chamber.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] The air supply is distributed through multiple pressure storage chambers. Each group of throttle holes uses a separate pressure storage chamber for air supply. By adjusting the air supply pressure, the asymmetric load of the hydrostatic gas bearing can be effectively balanced, and the load balancing capacity of the hydrostatic gas bearing can be improved. The size of the pressure storage chamber and the opening threshold of the reed valve can be further adjusted to adjust the air supply pressure of each group of throttle holes, and the pressure distribution of different areas of the air film generated by the hydrostatic gas bearing can be adjusted, thereby adjusting the bearing capacity of the air film in different areas, which can adapt to larger asymmetric loads, effectively improve the load balancing capacity of the hydrostatic gas bearing, ensure the performance of the Stirling generator, and reduce wear between the linear motor, power piston, and cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a multi-chamber static pressure gas bearing of a Stirling generator in an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a static pressure gas bearing cylinder of the illustrated embodiment.

[0018] Figure 3 yes Figure 1 Cross-sectional view of a static gas bearing cartridge of the illustrated embodiment.

[0019] Figure 4 yes Figure 1 A schematic structural diagram of a static pressure gas bearing cover according to the illustrated embodiment.

[0020] Figure 5 yes Figure 1 A schematic structural diagram of the partition of the illustrated embodiment.

[0021] Figure 6 yes Figure 1 Cross-sectional view of a multi-chamber hydrostatic gas bearing of the illustrated embodiment.

[0022] Figure 7 yes Figure 1 Schematic diagram of the internal structure of a multi-chamber static pressure gas bearing of the illustrated embodiment.

[0023] In the figure, 1—static pressure gas bearing cylinder, 2—static pressure gas bearing cover, 2-1—bottom cover, 2-2—connecting rod, 2-3—air inlet, 1-1—bottom plate, 1-2—connecting rod assembly hole, 1-3—partition, 1-4—pressure storage chamber, 1-5—throttle hole, 1-1-1—limiting boss, 1-3-1—arc block, 1-3-2—first partition body, 1-3-3—second partition body, 1-3-4—partition base, 1-3-5—limiting groove. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 1-7 The multi-chamber static pressure gas bearing of the Stirling generator of this embodiment includes a static pressure gas bearing cylinder 1, a static pressure gas bearing cover 2 and a reed valve 3. The static pressure gas bearing cover 2 includes a bottom cover 2-1 and a connecting rod 2-2. The connecting rod 2-2 is a hollow structure. The bottom cover 2-1 has a central opening. The connecting rod 2-2 is assembled on the central hole of the bottom cover 2-1. The gas bearing cylinder 1 is a hollow structure. One end of the gas bearing cylinder 1 is open, and the other end is provided with a bottom plate 1-1. The bottom plate 1-1 is provided with a connecting rod assembly hole 1-2. The static pressure gas bearing cover 2 is assembled on the open end of the gas bearing cylinder 1. The connecting rod 2 -2 extends into the connecting rod assembly hole 1-2, the chamber between the connecting rod 2-2 and the static pressure gas bearing cylinder 1 is evenly divided into N pressure storage chambers 1-4 by N partitions 1-3, and N air inlet holes 2-3 are provided on the bottom cover 2-1, each air inlet hole 2-3 corresponds to a pressure storage chamber 1-4, and the air inlet hole 2-3 is located directly below the corresponding pressure storage chamber 1-4 and is connected to the pressure storage chamber 1-4. N groups of throttle holes 1-5 are provided on the side wall of the gas bearing cylinder 1 along the circumferential direction, and each group of throttle holes 1-5 corresponds to each pressure storage chamber 1-4, and each group of throttle holes 1-5 is connected to the corresponding pressure storage chamber 1-4. A reed valve 3 is provided in each pressure storage chamber 1-4, and the reed valve 3 corresponds to the air inlet hole 2-3 one by one, and each reed valve 3 is located at the corresponding air inlet hole 2-3.

[0026] The partition 1-3 includes an arc block 1-3-1, a first partition body 1-3-2, a second partition body 1-3-3, and a partition base 1-3-4. The first partition body 1-3-2 and the second partition body 1-3-3 are arranged on both sides of the arc block 1-3-1. The partition base 1-3-4 is located at the end of the arc block 1-3-1 and connects the first partition body 1-3-2 and the second partition body 1-3-3. A trapezoidal limiting groove 1-3-5 is provided on the bottom surface of the partition base 1-3-4. The inner diameter of the arc block 1-3-1 is matched with the outer diameter of the connecting rod 2-2. N partitions 1-3 are enclosed around the connecting rod 2-2 to divide the chamber between the connecting rod 2-2 and the static pressure gas bearing cylinder 1 into N pressure storage chambers 1-4. N trapezoidal limiting bosses 1-1-1 are evenly arranged on the bottom plate 1-1 of the gas bearing cylinder 1. The limiting groove 1-3-5 of each partition base 1-3-4 is engaged in the corresponding limiting boss 1-1-1. The limiting groove 1-3-5 is interlocked with the limiting boss 1-1-1 and sealed with glue. The size of the pressure storage chamber 1-4 can be changed by adjusting the curvature of the arc block 1-3-1.

[0027] In this embodiment, N=6, the number of each group of throttle holes 1-5 is two, the throttle holes 1-5 are arranged in a two-row and six-column structure, the throttle holes are uniform in size, and the aperture size range is 0.1mm-0.2mm, and each group of throttle holes 1-5 uses a separate pressure storage chamber 1-4 to supply air. In practical applications, N can also take other values, as long as N≥2.

[0028] The present invention divides the air film generated by the hydrostatic gas bearing into six areas, which correspond to six columns of throttle holes respectively. The air supply pressure of each column of throttle holes 1-5 can be flexibly adjusted. The greater the air supply pressure, the greater the bearing capacity generated by the air film corresponding to this column of throttle holes 1-5. The greater the air supply pressure, the greater the bearing capacity generated by the air film corresponding to this column of throttle holes 1-5. By adjusting the bearing capacity generated by the air film in the six areas respectively, the load in each direction is balanced, thereby ensuring the balance and stability of the hydrostatic gas bearing.

[0029] Each pressure storage chamber 1-4 is equipped with a reed valve 3 to intercept the high-pressure gas in the compression chamber of the Stirling generator. When the air pressure is lower than the pressure threshold of the reed valve 3, the reed valve 3 is closed; when the air pressure reaches the pressure threshold of the reed valve 3, the reed valve 3 is blown open by the air pressure. The air supply (coarse adjustment) is distributed through multiple pressure storage chambers 1-4, and each group of throttle holes 1-5 uses a separate pressure storage chamber 1-4 for air supply. By adjusting the air supply pressure, the asymmetric load of the static pressure gas bearing can be effectively balanced, and the load balancing ability of the static pressure gas bearing can be improved. The size of the pressure storage chamber 1-4 and the opening threshold of the reed valve 3 can be further adjusted to achieve the adjustment (fine adjustment) of the air supply pressure of each group of throttle holes 1-5, and the pressure distribution of different areas of the air film generated by the static pressure gas bearing can be adjusted, thereby adjusting the bearing capacity of the air film in different areas, which can adapt to larger asymmetric loads, effectively improve the load balancing ability of the static pressure gas bearing, ensure the performance of the Stirling generator, and reduce wear between the linear motor, power piston, and cylinder.

[0030] Those skilled in the art may make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalents, then these modifications and variations are also within the protection scope of the present invention.

[0031] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A multi-chamber static pressure gas bearing for a Stirling generator, characterized in that: It includes a static pressure gas bearing cylinder, a static pressure gas bearing cover and a reed valve. The static pressure gas bearing cover includes a bottom cover and a connecting rod. The connecting rod is a hollow structure. The bottom cover has a central opening. The connecting rod is assembled on the central hole of the bottom cover. The gas bearing cylinder is a hollow structure. One end of the gas bearing cylinder is open and the other end is provided with a bottom plate. The bottom plate has a connecting rod assembly hole. The static pressure gas bearing cover is assembled on the open end of the gas bearing cylinder. The connecting rod extends into the connecting rod assembly hole. The chamber between the connecting rod and the static pressure gas bearing cylinder is evenly divided into N pressure storage chambers by N partitions. N air inlet holes are provided on the bottom cover. Each air inlet hole corresponds to a pressure storage chamber one by one. The air inlet hole is connected to the corresponding pressure storage chamber. The gas bearing N groups of throttle holes are provided on the side wall of the cylinder along the circumferential direction, each group of throttle holes corresponds to each pressure storage chamber, and each group of throttle holes is communicated with the corresponding pressure storage chamber; a reed valve is provided in each pressure storage chamber, and the reed valve corresponds to the air inlet hole one by one, and each reed valve is located at the corresponding air inlet hole; the partition includes an arc block, a first partition body, a second partition body and a partition base, the first partition body and the second partition body are arranged on both sides of the arc block, the partition base is located at the end of the arc block, and connects the first partition body and the second partition body, the inner diameter of the arc block is matched with the outer diameter of the connecting rod, and N partitions are enclosed around the connecting rod to divide the chamber between the connecting rod and the static pressure gas bearing cylinder into N pressure storage chambers.

2. The multi-chamber hydrostatic gas bearing for a Stirling generator according to claim 1, characterized in that: The bottom surface of the partition base is provided with a limiting groove, and the bottom plate of the gas bearing cylinder is evenly provided with N limiting bosses, and the limiting groove of each partition base is engaged in the corresponding limiting boss.

3. The multi-chamber hydrostatic gas bearing for a Stirling generator according to claim 1 or 2, characterized in that: Said N≥2.

4. The multi-chamber hydrostatic gas bearing for a Stirling generator as claimed in claim 3, characterized in that: The N=2~12.

5. The multi-chamber hydrostatic gas bearing for a Stirling generator according to claim 1 or 2, characterized in that: The throttling hole has a diameter of 0.1 mm to 0.2 mm.

6. The multi-chamber hydrostatic gas bearing for a Stirling generator according to claim 1 or 2, characterized in that: The number of throttle holes in each group is two, and the throttle holes are arranged in a two-row N-column structure.

7. The multi-chamber hydrostatic gas bearing for a Stirling generator according to claim 1 or 2, characterized in that: The air inlet hole is located directly below the corresponding pressure storage chamber.

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