Centrifugal vapor compression equipment with low-speed and high-speed series structure

Abstract

The utility model relates to a centrifugal steam compression device of a low-speed and high-speed serial structure, which relates to the technical field of steam compression and comprises an input pipe and an output pipe, and a low-speed compressor body and a high-speed compressor body are arranged between the input pipe and the output pipe. A double-shaft-extension motor is arranged between the low-speed compressor body and the high-speed compressor body, the double-shaft-extension motor is used for driving the low-speed compressor body and the high-speed compressor body to operate, and a low-speed inlet pipe is arranged between an inlet of the low-speed compressor body and an input pipe in a communicating mode. An outlet of the low-speed compressor body is communicated with a low-speed outlet pipe, an inlet of the high-speed compressor body is communicated with a high-speed inlet pipe, a high-speed outlet pipe is communicated between an outlet of the high-speed compressor body and an output pipe, and a conducting pipe is communicated between the low-speed outlet pipe and the high-speed inlet pipe. The application has the effect of expanding the application range of the centrifugal steam compression equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of vapor compression, especially to a centrifugal vapor compression equipment with low-speed and high-speed series structure. BACKGROUND

[0002] Mechanical vapor recompression system (MVR) is a kind of high-efficiency energy-saving evaporation technology, and its core principle is to use the characteristics of temperature rising with vapor pressure rising, compress the low-grade secondary steam generated in the evaporation process through a compressor, make its temperature and pressure rise to form high-grade steam, so as to realize the recycling of steam.

[0003] In the MVR system, the centrifugal vapor compression equipment is the main vapor compression equipment. Its working principle is to suck low-pressure steam through a high-speed rotating impeller, and convert kinetic energy into pressure potential energy in the diffuser, so as to improve the temperature and pressure of the steam.

[0004] At present, when the temperature rise requirement of the MVR evaporation system for the centrifugal vapor compression equipment is 25℃-33℃, the centrifugal vapor compression equipment usually adopts a single two-stage compression high-speed centrifugal vapor compressor or multiple low-speed centrifugal vapor compressors in series, but these two ways have a narrow temperature adjustment range, resulting in a small application range of the centrifugal vapor compression equipment. INVENTION CONTENTS

[0005] In order to expand the application range of the centrifugal vapor compression equipment, the application provides a centrifugal vapor compression equipment with low-speed and high-speed series structure.

[0006] The centrifugal vapor compression equipment with low-speed and high-speed series structure provided by the application adopts the following technical scheme:

[0007] A centrifugal vapor compression equipment with low-speed and high-speed series structure, comprising an input pipe and an output pipe, a low-speed compressor body and a high-speed compressor body are arranged between the input pipe and the output pipe, a double-shaft extension motor is arranged between the low-speed compressor body and the high-speed compressor body, the double-shaft extension motor is used to drive the low-speed compressor body and the high-speed compressor body to run, a low-speed inlet pipe is arranged in communication between the inlet of the low-speed compressor body and the input pipe, a low-speed outlet pipe is arranged in communication on the outlet of the low-speed compressor body, a high-speed inlet pipe is arranged in communication on the inlet of the high-speed compressor body, a high-speed outlet pipe is arranged in communication between the outlet of the high-speed compressor body and the output pipe, and a conduction pipe is arranged in communication between the low-speed outlet pipe and the high-speed inlet pipe.

[0008] By adopting the technical scheme, after the double-shaft extension motor drives the low-speed compressor body and the high-speed compressor body to start running, low-grade secondary steam enters the low-speed compressor body through the input pipe and the low-speed inlet pipe to be compressed for the first time, so that the temperature and pressure of the steam are preliminarily increased, then the compressed steam in the low-speed compressor body enters the high-speed compressor body through the low-speed outlet pipe, the through pipe and the high-speed inlet pipe to be compressed for the second time, so that the temperature and pressure of the steam are further increased, and finally the compressed steam in the high-speed compressor body is output through the high-speed outlet pipe and the output pipe. Since the low-speed compressor body provides a temperature rise of 0-9 DEG C and the high-speed compressor body provides a temperature rise of 0-24 DEG C, when the temperature rise requirement of the steam compressor of the MVR evaporation system is 25 DEG C-33 DEG C, the series connection of the low-speed compressor body and the high-speed compressor body not only makes the centrifugal steam compression equipment compact in structure, but also meets the temperature rise requirement of the MVR evaporation system, improves the temperature adjustment range, and expands the application range of the centrifugal steam compression equipment.

[0009] Preferably, a lubricating oil seat is fixedly arranged at the bottom of the double-shaft extension motor, the low-speed compressor body and the high-speed compressor body are arranged on the lubricating oil seat, a low-speed coupling is fixedly arranged on one output shaft of the double-shaft extension motor, the low-speed coupling is connected with the low-speed compressor body, and a high-speed coupling is fixedly arranged on the other output shaft of the double-shaft extension motor, the high-speed coupling is connected with the high-speed compressor body.

[0010] By adopting the technical scheme, the lubricating oil station serves as the lubricating oil seat, not only as the base of the low-speed compressor body and the high-speed compressor body, but also provides lubrication for the double-shaft extension motor, takes away the heat generated during the operation of the double-shaft extension motor, and prolongs the service life of the centrifugal steam compression equipment.

[0011] Preferably, the low-speed compressor body comprises a low-speed volute, a low-speed impeller and a low-speed collector, the low-speed volute is fixedly arranged on the lubricating oil seat, the low-speed collector is arranged on the low-speed volute, the low-speed impeller is arranged in the low-speed volute, the low-speed impeller is connected with the low-speed coupling, the low-speed inlet pipe is communicatively arranged between the low-speed collector and the input pipe, and the low-speed outlet pipe is communicatively arranged between the through pipe and the outlet of the low-speed volute.

[0012] By adopting the technical scheme, the double-shaft extension motor drives the low-speed coupling to rotate, the low-speed coupling drives the low-speed impeller to rotate in the low-speed volute, the steam in the low-speed inlet pipe flows to the low-speed impeller through the low-speed collector, the low-speed impeller rotates to compress the steam, and the compressed steam flows into the low-speed outlet pipe through the outlet of the low-speed volute.

[0013] As preferred, the lubricating oil seat is provided with a bearing box, a low-speed shaft is rotatably arranged in the bearing box, one end of the low-speed shaft is fixedly connected with a low-speed coupling, the other end of the low-speed shaft penetrates a low-speed volute, a low-speed sealing carbon ring is arranged between the low-speed shaft and the low-speed volute, a low-speed impeller is sleeved on the low-speed shaft, and the low-speed impeller is fixedly connected with the low-speed shaft.

[0014] By adopting the technical scheme, the low-speed coupling is rotated to drive the low-speed shaft to rotate, the low-speed shaft is rotated to drive the low-speed impeller to rotate, the low-speed sealing carbon ring reduces the steam leakage in the low-speed volute and the entry of external impurities into the low-speed volute, the steam compression process is continuous and stable, the efficiency of steam compression is improved, the lubricating oil seat formed by the lubricating oil station further provides lubrication for the bearing box and removes heat generated during the operation of the bearing box.

[0015] As preferred, the high-speed compressor body comprises a high-speed volute, a high-speed impeller and a high-speed collector, the high-speed volute is fixedly arranged on the lubricating oil seat, the high-speed collector is arranged on the high-speed volute, the high-speed impeller is arranged in the high-speed volute, the high-speed impeller is connected with the high-speed coupling, the high-speed inlet pipe is communicatively arranged between the through pipe and the high-speed collector, and the high-speed outlet pipe is communicatively arranged between the output pipe and the outlet of the high-speed volute.

[0016] By adopting the technical scheme, the high-speed coupling is rotated to drive the high-speed impeller to rotate in the high-speed volute, the steam in the high-speed inlet pipe flows to the high-speed impeller along the high-speed collector, the high-speed impeller is rotated to compress the steam, and the compressed steam flows into the high-speed outlet pipe from the outlet of the high-speed volute.

[0017] As preferred, the lubricating oil seat is provided with a gear box, an input shaft of the gear box is fixedly connected with the high-speed coupling, a high-speed shaft is fixedly arranged on an output shaft of the gear box, the high-speed shaft penetrates the high-speed volute, a high-speed sealing carbon ring is arranged between the high-speed shaft and the high-speed volute, the high-speed impeller is sleeved on the high-speed shaft, and the high-speed impeller is fixedly connected with the high-speed shaft.

[0018] By adopting the technical scheme, the gear box is a speed-increasing gear box, the high-speed coupling is rotated to drive the input shaft of the gear box to rotate, the input shaft of the gear box is rotated to drive the output shaft of the gear box to rotate, the output shaft of the gear box is rotated to drive the high-speed shaft to rotate, the high-speed shaft is rotated to drive the high-speed impeller to rotate, the high-speed sealing carbon ring reduces the steam leakage in the high-speed volute and the entry of external impurities into the high-speed volute, the steam compression process is continuous and stable, the efficiency of steam compression is improved, the lubricating oil seat formed by the lubricating oil station further provides lubrication for the speed-increasing gear box and removes heat generated during the operation of the speed-increasing gear box.

[0019] As preferred, expansion joints are arranged in communication between the input pipe and the low-speed inlet pipe, between the low-speed outlet pipe and the guide pipe, between the guide pipe and the high-speed inlet pipe, and between the high-speed outlet pipe and the output pipe.

[0020] By adopting the above technical solution, the expansion joints absorb thermal deformation and vibration generated by the input pipe, the low-speed inlet pipe, the low-speed outlet pipe, the guide pipe, the high-speed inlet pipe, the high-speed outlet pipe and the output pipe, thereby improving the safety and stability of the low-speed compressor body and the high-speed compressor body during operation.

[0021] As preferred, cooling water pipes are arranged in communication on the guide pipe and the output pipe.

[0022] By adopting the above technical solution, the cooling water is sprayed into the guide pipe through the cooling water pipe, thereby reducing the superheat degree of the output steam in the low-speed compressor body and improving the efficiency of the high-speed compressor body. The cooling water is sprayed into the output pipe through the cooling water pipe, thereby reducing the superheat degree of the output steam in the high-speed compressor body and improving the heat exchange efficiency of the MVR evaporation system.

[0023] As preferred, a bypass pipe is arranged in communication between the guide pipe and the output pipe, and a bypass valve is arranged on the bypass pipe.

[0024] By adopting the above technical solution, the damage of the centrifugal steam compression equipment due to surge is reduced by controlling the opening degree of the bypass valve.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. By arranging the input pipe, the output pipe, the low-speed compressor body, the high-speed compressor body, the double-shaft extension motor, the low-speed inlet pipe, the low-speed outlet pipe, the high-speed inlet pipe, the high-speed outlet pipe and the guide pipe, the centrifugal steam compression equipment has a compact structure, meets the temperature rise requirement of the MVR evaporation system, improves the temperature adjustment range, and expands the application range of the centrifugal steam compression equipment.

[0027] 2. By arranging the expansion joints, thermal deformation and vibration generated by the input pipe, the low-speed inlet pipe, the low-speed outlet pipe, the guide pipe, the high-speed inlet pipe, the high-speed outlet pipe and the output pipe are absorbed, thereby improving the safety and stability of the low-speed compressor body and the high-speed compressor body during operation.

[0028] 3. By arranging the cooling water pipes, the superheat degree of the output steam in the low-speed compressor body is reduced, the efficiency of the high-speed compressor body is improved, the superheat degree of the output steam in the high-speed compressor body is reduced, and the heat exchange efficiency of the MVR evaporation system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a centrifugal steam compression equipment with a low-speed and high-speed series structure in the embodiments of the present application.

[0030] Figure 2 is a schematic view of the positional relationship between the bearing box and the gear box in the embodiment of the present application.

[0031] Figure 3 is a sectional view of the connection relationship between the low-speed compressor body and the low-speed shaft in the embodiment of the present application.

[0032] Figure 4 is a sectional view of the connection relationship between the high-speed compressor body and the high-speed shaft in the embodiment of the present application.

[0033] BRIEF DESCRIPTION OF THE DRAWINGS 1, input pipe; 2, output pipe; 3, low-speed compressor body; 31, low-speed volute; 32, low-speed impeller; 33, low-speed collector; 4, high-speed compressor body; 41, high-speed volute; 42, high-speed impeller; 43, high-speed collector; 5, double-shaft extension motor; 51, lubricating oil seat; 52, low-speed coupling; 521, low-speed shaft; 522, bearing box; 523, low-speed sealing carbon ring; 53, high-speed coupling; 531, high-speed shaft; 532, gear box; 533, high-speed sealing carbon ring; 6, expansion joint; 61, low-speed inlet pipe; 62, low-speed outlet pipe; 63, high-speed inlet pipe; 64, high-speed outlet pipe; 65, through pipe; 7, cooling water pipe; 8, bypass pipe; 81, bypass valve. DETAILED DESCRIPTION

[0034] The following will be described in detail with reference to the accompanying drawings. Figures 1-4 The present application will be further described in detail.

[0035] The embodiment of the present application discloses a centrifugal steam compression device with low-speed and high-speed series connection structure. Referring to Figure 1 and Figure 2, including low-speed compressor body 3 and high-speed compressor body 4, between the low-speed compressor body 3 and high-speed compressor body 4 mounted double extension motor 5, double extension motor 5 for driving low-speed compressor body 3 and high-speed compressor body 4 operation. The inlet of low-speed compressor body 3 is communicated with low-speed inlet pipe 61, and low-speed inlet pipe 61 is communicated with input pipe 1. The outlet of low-speed compressor body 3 is communicated with low-speed outlet pipe 62, the inlet of high-speed compressor body 4 is communicated with high-speed inlet pipe 63, and low-speed outlet pipe 62 and high-speed inlet pipe 63 are communicated with conducting pipe 65. The outlet of high-speed compressor body 4 is communicated with high-speed outlet pipe 64, and high-speed outlet pipe 64 is communicated with output pipe 2. After double extension motor 5 drives low-speed compressor body 3 and high-speed compressor body 4 to start running, low-grade secondary steam enters low-speed compressor body 3 along input pipe 1 and low-speed inlet pipe 61 to be compressed for the first time, so that the temperature and pressure of the steam are preliminarily improved, then the compressed steam in low-speed compressor body 3 enters high-speed compressor body 4 along low-speed outlet pipe 62, conducting pipe 65 and high-speed inlet pipe 63 to be compressed for the second time, so that the temperature and pressure of the steam are further improved, and finally the compressed steam in high-speed compressor body 4 is output along high-speed outlet pipe 64 and output pipe 2. Because low-speed compressor body 3 provides 0-9℃ temperature rise, and high-speed compressor body 4 provides 0-24℃ temperature rise, when the temperature rise requirement of MVR evaporation system for steam compressor is 25-33℃, the series connection of low-speed compressor body 3 and high-speed compressor body 4 not only makes the structure of centrifugal steam compression equipment compact, but also meets the temperature rise requirement of MVR evaporation system, improves the temperature adjustment area, and expands the application range of centrifugal steam compression equipment.

[0036] In order to make the centrifugal steam compression equipment run stably, refer to Figure 1 and Figure 2, the expansion joint 6 is arranged in communication between the input pipe 1 and the low-speed inlet pipe 61, between the low-speed outlet pipe 62 and the guide pipe 65, between the guide pipe 65 and the high-speed inlet pipe 63, and between the high-speed outlet pipe 64 and the output pipe 2. The expansion joint 6 absorbs thermal deformation and vibration generated by the input pipe 1, the low-speed inlet pipe 61, the low-speed outlet pipe 62, the guide pipe 65, the high-speed inlet pipe 63, the high-speed outlet pipe 64, and the output pipe 2, thereby improving the safety and stability of the low-speed compressor body 3 and the high-speed compressor body 4 during operation. The guide pipe 65 and the output pipe 2 are both arranged in communication with a cooling water pipe 7, and the cooling water pipe 7 is connected to a cooling water source. Cooling water is sprayed into the guide pipe 65 through one of the cooling water pipes 7, thereby reducing the superheat of the output steam in the low-speed compressor body 3 and improving the efficiency of the high-speed compressor body 4. Cooling water is sprayed into the output pipe 2 through the other cooling water pipe 7, thereby reducing the superheat of the output steam in the high-speed compressor body 4 and improving the heat exchange efficiency of the MVR evaporation system. The bypass pipe 8 is arranged in communication between the guide pipe 65 and the output pipe 2, and the bypass valve 81 is installed on the bypass pipe 8. By controlling the opening degree of the bypass valve 81, the damage of the centrifugal steam compression equipment due to surge can be reduced.

[0037] To drive the low-speed compressor body 3 and the high-speed compressor body 4 to operate, refer to Figures 1 to 4 The lubricating oil seat 51 is installed at the bottom of the double-shaft extension motor 5, and the lubricating oil seat 51 is composed of a lubricating oil station. The low-speed compressor body 3 and the high-speed compressor body 4 are both installed on the lubricating oil seat 51, and the lubricating oil seat 51 is provided with a speed-increasing gear box 532 and a bearing box 522. The high-speed shaft 531 is installed on the output shaft of the speed-increasing gear box 532, and the high-speed shaft 531 is connected with the high-speed compressor body 4. The high-speed coupling 53 is installed on the input shaft of the speed-increasing gear box 532, and the high-speed coupling 53 is connected with one of the output shafts of the double-shaft extension motor 5. The low-speed shaft 521 is installed on the bearing box 522, one end of the low-speed shaft 521 is connected with the low-speed compressor body 3, and the low-speed coupling 52 is installed on the other end of the low-speed shaft 521, and the low-speed coupling 52 is connected with the other output shaft of the double-shaft extension motor 5. The lubricating oil seat 51 not only serves as the base of the low-speed compressor body 3 and the high-speed compressor body 4, but also provides lubrication for the double-shaft extension motor 5, the speed-increasing gear box 532, and the bearing box 522, removes heat generated by the operation of the double-shaft extension motor 5, the speed-increasing gear box 532, and the bearing box 522, and prolongs the service life of the centrifugal steam compression equipment.

[0038] Refer to Figure 2 and Figure 3The low-speed compressor body 3 comprises a low-speed volute 31, a low-speed impeller 32 and a low-speed collector 33. The low-speed volute 31 is of a steel plate welded structure, the low-speed volute 31 is fixedly installed on the lubricating oil seat 51, the low-speed collector 33 is installed on the low-speed volute 31, and the low-speed impeller 32 is located in the low-speed volute 31. The low-speed impeller 32 is welded by high-strength stainless steel plates and forgings, a flow guide cap is installed at the front end of the low-speed impeller 32, and the gap between the inlet end of the low-speed impeller 32 and the low-speed collector 33 with a tapered converging structure is small. The rubbing between the low-speed impeller 32 and the low-speed collector 33 during rotation of the low-speed impeller 32 is reduced, the return amount of gas is small, the steam uniformly fills the inlet cross section of the low-speed impeller 32, the generation of vortex is reduced, the flow loss is reduced, and the efficiency of the low-speed compressor body 3 is improved. The low-speed shaft 521 penetrates through the low-speed volute 31, the low-speed shaft 521 is rotationally connected with the low-speed volute 31, and the low-speed sealing carbon ring 523 is installed between the low-speed shaft 521 and the low-speed volute 31. The low-speed sealing carbon ring 523 reduces the leakage of steam in the low-speed volute 31 and the entry of external impurities into the low-speed volute 31, makes the steam compression process continuous and stable, and improves the efficiency of the low-speed compressor body 3. The low-speed impeller 32 is sleeved on the low-speed shaft 521, the low-speed impeller 32 is connected with the low-speed shaft 521 in interference fit, and the low-speed impeller 32 and the low-speed shaft 521 are axially limited by a nut. The low-speed inlet pipe 61 is communicatively arranged between the low-speed collector 33 and the input pipe 1, and the low-speed outlet pipe 62 is communicatively arranged between the guide pipe 65 and the outlet of the low-speed volute 31. The double-shaft extension motor 5 drives the low-speed coupling 52 to rotate, the low-speed coupling 52 drives the low-speed shaft 521 to rotate, and the low-speed shaft 521 drives the low-speed impeller 32 to rotate in the low-speed volute 31. The steam in the low-speed inlet pipe 61 flows to the low-speed impeller 32 along the low-speed collector 33, the low-speed impeller 32 rotates to compress the steam, and the compressed steam flows into the low-speed outlet pipe 62 from the outlet of the low-speed volute 31.

[0039] Referring to Figure 2 and Figure 4The high-speed compressor body 4 comprises a high-speed volute 41, a high-speed impeller 42 and a high-speed collector 43. The high-speed volute 41 is a steel plate welded structure, the high-speed volute 41 is installed on a lubricating oil seat 51, the high-speed collector 43 is installed on the high-speed volute 41, and the high-speed impeller 42 is located in the high-speed volute 41. The high-speed impeller 42 adopts a semi-open three-dimensional flow structure and is made of a titanium alloy forging, which reduces the weight of the high-speed impeller 42 and improves the efficiency and service life of the high-speed impeller 42. The gap between the high-speed impeller 42 and the high-speed collector 43 with a conical converging structure is small, which reduces the rubbing between the high-speed impeller 42 and the high-speed collector 43 during rotation of the high-speed impeller 42, reduces the gas backflow amount, makes the steam uniformly fill the inlet cross section of the high-speed impeller 42, reduces the generation of vortex, reduces flow loss, and improves the efficiency of the high-speed compressor body 4. The high-speed shaft 531 penetrates the high-speed volute 41, the high-speed shaft 531 is rotationally connected with the high-speed volute 41, and the high-speed sealing carbon ring 533 is installed between the high-speed shaft 531 and the high-speed volute 41. The high-speed sealing carbon ring 533 reduces the leakage of steam in the high-speed volute 41 and the entry of external impurities into the high-speed volute 41, makes the steam compression process continuous and stable, and improves the efficiency of the high-speed compressor body 4. The high-speed impeller 42 is sleeved on the high-speed shaft 531, and the high-speed impeller 42 is locked on the high-speed shaft 531 through a screw rod and a flow guide nut. The high-speed inlet pipe 63 is connected between the guide pipe 65 and the high-speed collector 43, and the high-speed outlet pipe 64 is connected between the output pipe 2 and the outlet of the high-speed volute 41. The double-shaft extension motor 5 drives the high-speed shaft 531 to rotate, the high-speed shaft 531 drives the input shaft of the gear box 532 to rotate, the input shaft of the gear box 532 drives the output shaft of the gear box 532 to rotate, the output shaft of the gear box 532 drives the high-speed shaft 531 to rotate, and the high-speed shaft 531 drives the high-speed impeller 42 to rotate in the high-speed volute 41. The steam in the high-speed inlet pipe 63 flows to the high-speed impeller 42 along the high-speed collector 43, the high-speed impeller 42 rotates to compress the steam, and the compressed steam flows into the high-speed outlet pipe 64 from the outlet of the high-speed volute 41.

[0040] The implementation principle of the embodiment of the low-speed and high-speed series structure centrifugal steam compression device is as follows: after the dual-shaft extension motor 5 drives the low-speed compressor body 3 and the high-speed compressor body 4 to start running, low-grade secondary steam enters the low-speed compressor body 3 through the input pipe 1 and the low-speed inlet pipe 61 to be compressed for the first time, so that the temperature and pressure of the steam are preliminarily increased, then the compressed steam in the low-speed compressor body 3 enters the high-speed compressor body 4 through the low-speed outlet pipe 62, the conduction pipe 65 and the high-speed inlet pipe 63 to be compressed for the second time, so that the temperature and pressure of the steam are further increased, and finally the compressed steam in the high-speed compressor body 4 is output through the high-speed outlet pipe 64 and the output pipe 2. Since the low-speed compressor body 3 provides a temperature rise of 0-9 DEG C and the high-speed compressor body 4 provides a temperature rise of 0-24 DEG C, when the temperature rise requirement of the MVR evaporation system for the steam compressor is 25 DEG C-33 DEG C, the series connection of the low-speed compressor body 3 and the high-speed compressor body 4 not only makes the centrifugal steam compression device compact in structure, but also meets the temperature rise requirement of the MVR evaporation system, improves the temperature adjustment range, and expands the application range of the centrifugal steam compression device.

[0041] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A centrifugal vapor compression apparatus of low and high speed series configuration comprising an input pipe and an output pipe, characterized in that: The input pipe and the output pipe are provided with a low-speed compressor body and a high-speed compressor body, a double-shaft extension motor is arranged between the low-speed compressor body and the high-speed compressor body, the double-shaft extension motor is used to drive the low-speed compressor body and the high-speed compressor body to operate, a low-speed inlet pipe is arranged in communication between the inlet of the low-speed compressor body and the input pipe, a low-speed outlet pipe is arranged in communication on the outlet of the low-speed compressor body, a high-speed inlet pipe is arranged in communication on the inlet of the high-speed compressor body, a high-speed outlet pipe is arranged in communication between the outlet of the high-speed compressor body and the output pipe, and a guide pipe is arranged in communication between the low-speed outlet pipe and the high-speed inlet pipe.

2. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 1, characterized in that: A lubricating oil seat is fixedly arranged at the bottom of the double-shaft extension motor, the low-speed compressor body and the high-speed compressor body are arranged on the lubricating oil seat, a low-speed coupling is fixedly arranged on one output shaft of the double-shaft extension motor, the low-speed coupling is connected with the low-speed compressor body, a high-speed coupling is fixedly arranged on the other output shaft of the double-shaft extension motor, and the high-speed coupling is connected with the high-speed compressor body.

3. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 2, characterized in that: The low-speed compressor body comprises a low-speed volute, a low-speed impeller and a low-speed collector, the low-speed volute is fixedly arranged on the lubricating oil seat, the low-speed collector is arranged on the low-speed volute, the low-speed impeller is arranged in the low-speed volute, the low-speed impeller is connected with the low-speed coupling, the low-speed inlet pipe is arranged in communication between the low-speed collector and the input pipe, and the low-speed outlet pipe is arranged in communication between the guide pipe and the outlet of the low-speed volute.

4. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 3, characterized in that: A bearing box is arranged on the lubricating oil seat, a low-speed shaft is rotatably arranged in the bearing box, one end of the low-speed shaft is fixedly connected with the low-speed coupling, the other end of the low-speed shaft penetrates through the low-speed volute, a low-speed sealing carbon ring is arranged between the low-speed shaft and the low-speed volute, the low-speed impeller is sleeved on the low-speed shaft, and the low-speed impeller is fixedly connected with the low-speed shaft.

5. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 2, characterized in that: The high-speed compressor body comprises a high-speed volute, a high-speed impeller and a high-speed collector, the high-speed volute is fixedly arranged on the lubricating oil seat, the high-speed collector is arranged on the high-speed volute, the high-speed impeller is arranged in the high-speed volute, the high-speed impeller is connected with the high-speed coupling, the high-speed inlet pipe is arranged in communication between the guide pipe and the high-speed collector, and the high-speed outlet pipe is arranged in communication between the output pipe and the outlet of the high-speed volute.

6. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 5, characterized in that: A gear box is arranged on the lubricating oil seat, an input shaft of the gear box is fixedly connected with the high-speed coupling, a high-speed shaft is fixedly arranged on an output shaft of the gear box, the high-speed shaft penetrates through the high-speed volute, a high-speed sealing carbon ring is arranged between the high-speed shaft and the high-speed volute, the high-speed impeller is sleeved on the high-speed shaft, and the high-speed impeller is fixedly connected with the high-speed shaft.

7. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 1, characterized in that: Expansion joints are arranged in communication between the input pipe and the low-speed inlet pipe, between the low-speed outlet pipe and the guide pipe, between the guide pipe and the high-speed inlet pipe, and between the high-speed outlet pipe and the output pipe.

8. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 1, characterized in that: Cooling water pipes are arranged in communication on the guide pipe and the output pipe.

9. A centrifugal vapor compression apparatus of low and high speed series configuration according to claim 1, characterized in that: A bypass pipe is arranged in communication between the guide pipe and the output pipe, and a bypass valve is arranged on the bypass pipe.

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