阅读说明：本技术 一种用于冷媒平稳流入的磁悬浮压缩机 (Magnetic suspension compressor for stable inflow of refrigerant ) 是由 袁军 钟仁志 于 2021-08-30 设计创作，主要内容包括：本发明涉及压缩机领域,尤其涉及一种用于冷媒平稳流入的磁悬浮压缩机。该压缩机包括机壳、第一叶轮、第一蜗壳、连接管、第二叶轮和第二蜗壳；机壳包括定位部和稳流通道,定位部设置有定位孔；稳流通道一端为冷媒输入端；稳流通道内设置有稳流导叶,稳流导叶用于对进入稳流通道内的冷媒进行导流；第一蜗壳和第二蜗壳分别设置有第一通道和第二通道,第一通道输入端与稳流通道另一端相连通,第一通道输出端通过连接管与第二通道输入端相连通,第二通道输出端为冷媒输出端。该压缩机使得冷媒进入第一叶轮输入端之前先被稳流通道内被导流后平稳流入第一叶轮输入端,提高磁悬浮压缩机压缩效率。(The invention relates to the field of compressors, in particular to a magnetic suspension compressor for stable inflow of a refrigerant. The compressor comprises a shell, a first impeller, a first volute, a connecting pipe, a second impeller and a second volute; the casing comprises a positioning part and a flow stabilizing channel, and the positioning part is provided with a positioning hole; one end of the flow stabilizing channel is a refrigerant input end; a flow stabilizing guide vane is arranged in the flow stabilizing channel and used for guiding the refrigerant entering the flow stabilizing channel; the first volute and the second volute are respectively provided with a first channel and a second channel, the input end of the first channel is communicated with the other end of the flow stabilizing channel, the output end of the first channel is communicated with the input end of the second channel through a connecting pipe, and the output end of the second channel is a refrigerant output end. The compressor enables the refrigerant to be guided in the flow stabilizing channel before entering the input end of the first impeller and then to stably flow into the input end of the first impeller, and compression efficiency of the magnetic suspension compressor is improved.)

1. A magnetic suspension compressor for stable inflow of a refrigerant is characterized by comprising a shell (1), a motor shaft (2), a magnetic bearing device (3), a first impeller (4), a first volute (5), a connecting pipe (6), a second impeller (7) and a second volute (8); the machine shell (1) comprises a positioning part (11) and a flow stabilizing channel (12), wherein the positioning part (11) is provided with a positioning hole (13); the motor shaft (2) is positioned in the positioning hole (13), and the magnetic bearing device (3) is embedded in the inner wall of the positioning hole (13) and sleeved on the outer wall of the motor shaft (2); the flow stabilizing channel (12) is distributed on the outer side of the positioning part (11) along the axial direction, and one end of the flow stabilizing channel (12) is a refrigerant input end; a flow stabilizing guide vane (14) is arranged in the flow stabilizing channel (12), and the flow stabilizing guide vane (14) is used for guiding the refrigerant entering the flow stabilizing channel (12); the first volute (5) and the second volute (8) are respectively provided with a first channel (51) and a second channel (81), and the first impeller (4) and the second impeller (7) are fixedly connected to one end of the motor shaft (2) and are respectively positioned in the first channel (51) and the second channel (81); the input end of the first channel (51) is communicated with the other end of the steady flow channel (12), the output end of the first channel (51) is communicated with the input end of the second channel (81) through a connecting pipe (6), and the output end of the second channel (81) is a refrigerant output end; a connecting pipe guide vane (61) is arranged in the connecting pipe (6), and the connecting pipe guide vane (61) is used for guiding the refrigerant in the connecting pipe (6).

2. The maglev compressor for smooth inflow of refrigerant according to claim 1, wherein the flow stabilizing guide vane (14) divides the flow stabilizing channel (12) into a plurality of arc-shaped channels distributed circumferentially, one end of the plurality of connecting pipe guide vanes (61) is fixed on the inner wall of the connecting pipe (6), and the other end of the plurality of connecting pipe guide vanes (61) extends toward the center of the connecting pipe (6) and forms a cross-shaped distribution.

3. The magnetic levitation compressor for smooth inflow of refrigerant according to claim 1, wherein the first impeller (4) and the second impeller (7) both adopt a closed impeller structure, and the first impeller (4) and the second impeller (7) both adopt three-dimensional flow blades made of an aerospace forged aluminum material.

4. The magnetic suspension compressor for smooth inflow of refrigerant according to claim 1, wherein the input end of the second impeller (7) and one end of the flow stabilizing channel (12) are both provided with a fairing (71), and the fairing (71) is used for guiding the refrigerant entering the second channel (81) and the flow stabilizing channel (12) to improve the flow field efficiency.

5. The magnetic levitation compressor for smooth inflow of refrigerant as recited in claim 1, wherein the first impeller (4) and the second impeller (7) are disposed back-to-back.

6. The maglev compressor for smooth inflow of refrigerant according to claim 1, wherein labyrinth seals (52) are disposed between the inner wall of the first volute (5) and the input end of the first impeller (4) and between the inner wall of the second volute (8) and the input end of the second impeller (7), and the labyrinth seals (52) are configured to prevent the high-pressure refrigerant at the output end of the first channel (51) and the output end of the second channel (81) from flowing back to the input end of the first channel (51) and the input end of the second channel (81).

7. The maglev compressor for smooth inflow of refrigerant according to claim 1, wherein a diffuser vane (53) is disposed between an inner wall of the first volute (5) and an output end of the first impeller (4) and between an inner wall of the second volute (8) and an output end of the second impeller (7), and the diffuser vane (53) is used for diffusing and guiding the refrigerant flowing out of the first channel (51) and the second channel (81), so as to further improve flow field efficiency.

8. The magnetic suspension compressor for smooth inflow of refrigerant according to claim 1, wherein the first volute (5) is fixed on the casing (1), and an O-ring is disposed between the first volute (5) and the casing (1); the second volute (8) is fixed on the first volute (5), and an O-shaped sealing ring is arranged between the second volute (8) and the first volute (5); sealing gaskets are arranged at the connecting positions of the two ends of the connecting pipe (6) and the output end of the first channel (51) and the input end of the second channel (81).

9. The magnetic levitation compressor for smooth inflow of refrigerant as recited in claim 1, wherein the magnetic bearing device (3) comprises a radial magnetic bearing (31) and an axial magnetic bearing (32), the motor shaft (2) is fixedly provided with a radial bearing rotor (21) and a thrust disc (22); the two radial magnetic bearings (31) are respectively fixed on the casing (1), and the supporting ends of the radial magnetic bearings (31) correspond to the radial bearing rotor (21); the two axial magnetic bearings (32) are respectively fixed on the casing (1), and the limiting ends of the two axial magnetic bearings (32) are respectively positioned at two axial sides of the thrust disc (22).

10. The magnetic suspension compressor for smooth inflow of refrigerant according to claim 1, wherein a front protection bearing seat (91) and a rear protection bearing seat (92) are respectively fixedly arranged at two ends of the casing (1), and the magnetic suspension compressor is provided with a protection bearing (93); the front protection bearing seat (91) and the rear protection bearing seat (92) are both provided with bearing inner holes, and a plurality of protection bearings (93) are sleeved on the outer wall of the motor shaft (2) and are respectively positioned in the bearing inner holes of the front protection bearing seat (91) and the rear protection bearing seat (92); the outer ring of the protection bearing (93) is in interference fit with the inner bearing holes of the front protection bearing seat (91) and the rear protection bearing seat (92), and a gap exists between the inner ring of the protection bearing (93) and the outer wall of the motor shaft (2).

Technical Field

The invention relates to the field of compressors, in particular to a magnetic suspension compressor for stable inflow of a refrigerant.

Background

The magnetic suspension refrigerant compressor has the working principle that: the magnetic suspension refrigerant compressor discharges refrigerant medium from the magnetic suspension compressor at high temperature and high pressure, enters a condenser, releases heat to copper pipe cooling water, and condenses the refrigerant medium into medium-temperature high-pressure refrigerant medium liquid; then, the refrigerant is decompressed into low-temperature and low-pressure liquid through a shutoff valve, the low-temperature and low-pressure liquid enters an evaporator, and heat is absorbed from the chilled water flowing through the copper pipe in the shell of the evaporator; the gasified gas is sucked into the compressor after being gasified into low-temperature low-pressure gas, the high-temperature high-pressure gas is discharged after being secondarily compressed in the compressor, and the purpose of cooling is finally achieved through the circulation.

The Chinese patent application (publication No. CN101956689A, published: 20110126) discloses a refrigeration compressor, which comprises a lower shell and an upper shell, wherein a compression motor is arranged in the lower shell, a compression device which is connected with the compressor motor and rotates is arranged in the upper shell, a compression chamber is arranged at the top of the upper shell, the compression device comprises a turbine rod, a first-stage turbine and a second-stage turbine are arranged on the turbine rod, the first-stage turbine and the second-stage turbine are surrounded by the compression chamber, and the inner wall of one side of the compression chamber, facing the first-stage turbine and the second-stage turbine, forms a shape matched with the first-stage turbine and the second-stage turbine.

The prior art has the following defects: the traditional magnetic suspension compressor directly connects the refrigerant to the input end of the first impeller so as to compress the refrigerant; in this way, the input refrigerant is not pre-processed, and when the input refrigerant is disturbed, a large impact is caused to the first impeller; and then the flow field of the input end of the first impeller is disordered, and the compression efficiency of the magnetic suspension compressor is reduced.

Disclosure of Invention

The purpose of the invention is: aiming at the problems, a flow stabilizing channel is arranged in the shell, and a flow stabilizing guide vane is arranged in the flow stabilizing channel to guide the refrigerant; therefore, the refrigerant is firstly guided by the flow stabilizing channel before entering the input end of the first impeller and then stably flows into the input end of the first impeller, and the compression efficiency of the magnetic suspension compressor is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a magnetic suspension compressor for the stable inflow of a refrigerant comprises a shell, a motor shaft, a magnetic bearing device, a first impeller, a first volute, a connecting pipe, a second impeller and a second volute; the casing comprises a positioning part and a flow stabilizing channel, and the positioning part is provided with a positioning hole; the motor shaft is positioned in the positioning hole, and the magnetic bearing device is embedded in the inner wall of the positioning hole and sleeved on the outer wall of the motor shaft; the flow stabilizing channel is distributed on the outer side of the positioning part along the axial direction, and one end of the flow stabilizing channel is a refrigerant input end; a flow stabilizing guide vane is arranged in the flow stabilizing channel and used for guiding the refrigerant entering the flow stabilizing channel; the first volute and the second volute are respectively provided with a first channel and a second channel, and the first impeller and the second impeller are fixedly connected to one end of the motor shaft and are respectively positioned in the first channel and the second channel; the input end of the first channel is communicated with the other end of the steady flow channel, the output end of the first channel is communicated with the input end of the second channel through a connecting pipe, and the output end of the second channel is a refrigerant output end; and a connecting pipe guide vane is arranged in the connecting pipe and is used for guiding the refrigerant in the connecting pipe.

Preferably, the flow stabilizing guide vane divides the flow stabilizing channel into a plurality of arc-shaped channels distributed circumferentially, one end of each of the plurality of connecting pipe guide vanes is fixed on the inner wall of the connecting pipe, and the other end of each of the plurality of connecting pipe guide vanes extends towards the center of the connecting pipe and is distributed in a cross shape.

Preferably, the first impeller and the second impeller are both in a closed impeller structure, and the first impeller and the second impeller are both three-dimensional flow blades made of aerospace forged aluminum materials.

Preferably, the input end of the second impeller and one end of the flow stabilizing channel are both provided with a fairing, and the fairings are used for guiding the refrigerant entering the second channel and the flow stabilizing channel, so that the flow field efficiency is improved. The first impeller and the second impeller are arranged back to back.

Preferably, labyrinth seals are arranged between the inner wall of the first volute and the input end of the first impeller and between the inner wall of the second volute and the input end of the second impeller, and are used for preventing high-pressure refrigerants at the output ends of the first channel and the second channel from flowing back to the input ends of the first channel and the second channel.

Preferably, diffusion guide vanes are arranged between the inner wall of the first volute and the output end of the first impeller and between the inner wall of the second volute and the output end of the second impeller, and are used for performing diffusion flow guiding on the refrigerant flowing out of the first channel and the second channel, so that the flow field efficiency is further improved.

Preferably, the first volute is fixed on the casing, and an O-shaped sealing ring is arranged between the first volute and the casing; the second volute is fixed on the first volute, and an O-shaped sealing ring is arranged between the second volute and the first volute; sealing gaskets are arranged at the connecting position of the two ends of the connecting pipe and the output end of the first channel and the connecting position of the two ends of the connecting pipe and the input end of the second channel respectively.

Preferably, the magnetic bearing device comprises a radial magnetic bearing and an axial magnetic bearing, and a radial bearing rotor and a thrust disc are fixedly arranged on a motor shaft; the two radial magnetic bearings are respectively fixed on the shell, and the supporting ends of the radial magnetic bearings correspond to the positions of the radial bearing rotors; the two axial magnetic bearings are respectively fixed on the shell, and the limiting ends of the two axial magnetic bearings are respectively positioned at the two axial sides of the thrust disc.

Preferably, a front protection bearing seat and a rear protection bearing seat are fixedly arranged at two ends of the shell respectively, and the magnetic suspension compressor is provided with a protection bearing; the front protection bearing seat and the rear protection bearing seat are both provided with bearing inner holes, and a plurality of protection bearings are sleeved on the outer wall of the motor shaft and are respectively positioned in the bearing inner holes of the front protection bearing seat and the rear protection bearing seat; the outer ring of the protective bearing is in interference fit with the inner holes of the front protective bearing seat and the rear protective bearing seat, and a gap exists between the inner ring of the protective bearing and the outer wall of the motor shaft.

The magnetic suspension compressor for the stable inflow of the refrigerant, which adopts the technical scheme, has the advantages that:

when the flow-stabilizing guide vane type air conditioner works, a refrigerant flows in along one end of the flow-stabilizing channel, then flows to the input end of the first channel along the flow-stabilizing channel and is guided by the flow-stabilizing guide vane when flowing in the flow-stabilizing channel; the first impeller conveys the refrigerant to the input end of the second channel along the connecting pipe after performing primary compression on the refrigerant, and the second impeller discharges the refrigerant after performing secondary compression on the refrigerant to complete the refrigerant compression process. In the mode, the refrigerant is guided by the flow stabilizing guide vane in the flow stabilizing channel before entering the first impeller so that the refrigerant flows stably, the condition that the first impeller is impacted due to refrigerant flowing disorder is avoided, and the compression efficiency of the magnetic suspension compressor is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 and 3 are schematic structural diagrams of the chassis.

Fig. 4 and 5 are schematic structural views of the connecting pipe.

Fig. 6 is a schematic structural view of the first scroll.

Fig. 7 is a schematic structural view of the second scroll.

Fig. 8 is a schematic view of the structure of the motor shaft.

54-O type sealing ring, 55-sealing gasket.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

As shown in fig. 1 to 5, the magnetic levitation compressor for smooth inflow of a refrigerant includes a casing 1, a motor shaft 2, a magnetic bearing device 3, a first impeller 4, a first volute 5, a connecting pipe 6, a second impeller 7, and a second volute 8; the machine shell 1 comprises a positioning part 11 and a flow stabilizing channel 12, wherein the positioning part 11 is provided with a positioning hole 13; the motor shaft 2 is positioned in the positioning hole 13, and the magnetic bearing device 3 is embedded in the inner wall of the positioning hole 13 and sleeved on the outer wall of the motor shaft 2; the flow stabilizing channel 12 is distributed outside the positioning part 11 along the axial direction, and one end of the flow stabilizing channel 12 is a refrigerant input end; a flow stabilizing guide vane 14 is arranged in the flow stabilizing channel 12, and the flow stabilizing guide vane 14 is used for guiding the refrigerant entering the flow stabilizing channel 12; the first volute 5 and the second volute 8 are respectively provided with a first channel 51 and a second channel 81, and the first impeller 4 and the second impeller 7 are both fixedly connected to one end of the motor shaft 2 and are respectively positioned in the first channel 51 and the second channel 81; the input end of the first channel 51 is communicated with the other end of the steady flow channel 12, the output end of the first channel 51 is communicated with the input end of the second channel 81 through a connecting pipe 6, and the output end of the second channel 81 is a refrigerant output end; a connecting pipe guide vane 61 is arranged in the connecting pipe 6, and the connecting pipe guide vane 61 is used for guiding the refrigerant in the connecting pipe 6. During operation, a refrigerant flows in along one end of the flow stabilizing channel 12, then flows to the input end of the first channel 51 along the flow stabilizing channel 12, and is guided by the flow stabilizing guide vane 14 when flowing in the flow stabilizing channel 12; the first impeller 4 carries out primary compression on the refrigerant and then conveys the refrigerant to the input end of the second channel 81 along the connecting pipe 6, and the second impeller 7 carries out secondary compression on the refrigerant and then discharges the refrigerant to complete the refrigerant compression process. In this way, the refrigerant is guided by the flow stabilizing guide vane 14 in the flow stabilizing channel 12 before entering the first impeller 4, so that the refrigerant flows stably, thereby avoiding the situation that the first impeller is impacted due to refrigerant flow disorder, and further improving the compression efficiency of the magnetic suspension compressor.

The flow stabilizing guide vane 14 divides the flow stabilizing channel 12 into a plurality of arc-shaped channels distributed circumferentially, one end of each of the plurality of connecting pipe guide vanes 61 is fixed on the inner wall of the connecting pipe 6, and the other end of each of the plurality of connecting pipe guide vanes 61 extends towards the center of the connecting pipe 6 and is distributed in a cross shape.

The first impeller 4 and the second impeller 7 both adopt a closed impeller structure, and the first impeller 4 and the second impeller 7 both adopt a three-dimensional flow blade made of an aerospace forged aluminum material. The aerospace forged aluminum material has the advantages of high graded and changeable efficiency and stable performance.

Both the input end of the second impeller 7 and one end of the flow stabilizing channel 12 are provided with a fairing 71, and the fairing 71 is used for guiding the refrigerant entering the second channel 81 and the flow stabilizing channel 12, so that the flow field efficiency is improved.

The first impeller 4 and the second impeller 7 are arranged back to back so that the axial forces generated by the first impeller 4 and the second impeller 7 can be partially offset; further reducing the axial force of the whole device and reducing the axial load of the magnetic bearing device 3; the magnetic bearing device 3 has smaller volume, lower cost, smaller heat productivity and more stable whole shafting.

As shown in fig. 6 and 7, labyrinth seals 52 are disposed between the inner wall of the first scroll 5 and the input end of the first impeller 4 and between the inner wall of the second scroll 8 and the input end of the second impeller 7, and the labyrinth seals 52 are used for preventing the high-pressure refrigerant at the output end of the first passage 51 and the output end of the second passage 81 from flowing back to the input end of the first passage 51 and the input end of the second passage 81.

Diffusion guide vanes 53 are arranged between the inner wall of the first volute 5 and the output end of the first impeller 4 and between the inner wall of the second volute 8 and the output end of the second impeller 7, and the diffusion guide vanes 53 are used for performing diffusion flow guiding on the refrigerants flowing out of the first channel 51 and the second channel 81, so that the flow field efficiency is further improved.

As shown in fig. 1, the first volute 5 is fixed on the casing 1, and an O-ring is arranged between the first volute 5 and the casing 1; the second volute 8 is fixed on the first volute 5, and an O-shaped sealing ring is arranged between the second volute 8 and the first volute 5; sealing gaskets are arranged at the connecting position of the two ends of the connecting pipe 6 and the output end of the first channel 51 and the connecting position of the two ends of the connecting pipe 81. The setting of O type sealing washer and seal gasket is sealed up whole equipment, prevents that the inside refrigerant of equipment from flowing along part joint gap.

The magnetic bearing device 3 comprises a radial magnetic bearing 31 and an axial magnetic bearing 32, and the motor shaft 2 is fixedly provided with a radial bearing rotor 21 and a thrust disc 22; two radial magnetic bearings 31 are respectively fixed on the casing 1, and the supporting ends of the radial magnetic bearings 31 correspond to the radial bearing rotor 21; two axial magnetic bearings 32 are respectively fixed on the casing 1, and the limit ends of the two axial magnetic bearings 32 are respectively located at two axial sides of the thrust disc 22. The radial magnetic bearing 31 radially supports the motor shaft 2 by controlling the radial position of the radial bearing rotor 21, and the axial magnetic bearing 32 axially limits the motor shaft 2 by controlling the axial position of the thrust disc 22.

A front protection bearing seat 91 and a rear protection bearing seat 92 are respectively and fixedly arranged at two ends of the machine shell 1, and the magnetic suspension compressor is provided with a protection bearing 93; the front protective bearing seat 91 and the rear protective bearing seat 92 are both provided with bearing inner holes, and a plurality of protective bearings 93 are sleeved on the outer wall of the motor shaft 2 and are respectively positioned in the bearing inner holes of the front protective bearing seat 91 and the rear protective bearing seat 92; the outer ring of the protective bearing 93 is in interference fit with the inner bearing holes of the front protective bearing seat 91 and the rear protective bearing seat 92, and a gap exists between the inner ring of the protective bearing 93 and the outer wall of the motor shaft 2. When the equipment is suddenly powered off or stopped, the radial magnetic bearing 231 and the axial magnetic bearing 232 lose magnetic force and can not support and limit the motor shaft 22, and at the moment, the motor shaft 22 falls down and contacts with the inner ring of the protective bearing 5 to be supported by the protective bearing 11; thereby avoiding the damage of important parts such as the radial magnetic bearing 231 and the axial magnetic bearing 232 caused by the sudden power failure of the motor or the sudden falling of the motor shaft 22 when the motor is stopped.