CN215048814U - Air suction pipe - Google Patents

Abstract

The utility model relates to an breathing pipe for connect a plurality of compressors, the breathing pipe is equipped with inlet port and the port of giving vent to anger, inlet port be used for to provide gaseous state refrigerant in the breathing pipe, the port of giving vent to anger connects every the compressor, with in the breathing pipe gaseous state refrigerant distributes to every in the compressor. The suction pipe can uniformly provide gaseous refrigerant for a plurality of compressors.

Description

Air suction pipe

The application is a divisional application, the application number of the divisional application is 202021537797.6, the application date is 7/29/2020, and the invention is named as 'a heat source device and an evaporation concentration system'.

Technical Field

The utility model relates to an air suction pipe belongs to the environmental protection equipment field.

Background

Energy and environmental issues have become increasingly prominent in industrial production, which puts higher demands on energy saving technology. The discharge of industrial wastewater causes serious environmental pollution, in order to protect the environment, the sewage discharge needs to be strictly controlled, each large-scale refuse landfill enterprise needs to discharge sewage after the sewage is treated by a special sewage treatment plant, and the sewage treatment plant generally charges according to the treatment capacity, for example, one ton and several thousand yuan, so the cost of the enterprise on the sewage treatment is also greatly increased. The heat pump technology is an efficient and environment-friendly energy-saving technology, and can be widely applied to the industrial production fields of chemical industry, low-grade heat energy utilization, seawater desalination, sewage treatment and the like. After the heat pump evaporation concentration, can follow and draw out the distilled water that accords with emission standard in the sewage, this distilled water can directly discharge, and remaining concentrate discharges sewage treatment plant again and handles the sewage treatment cost that can the significantly reduce enterprise, for example 10 tons of sewage can decompose into 9 tons of distilled water and 1 ton of concentrate after the evaporation concentration, and the enterprise only needs the cost of spending 1 ton of handling capacity to greatly reduced sewage treatment expense. However, most of the existing evaporation concentration equipment has low treatment capacity, poor heat exchange efficiency, high price and energy consumption, and large investment for purchasing a plurality of equipment for enterprises with large daily average treatment capacity. Therefore, the development of a heat pump evaporation and concentration system with low cost, high efficiency and large tonnage is significant.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a breathing pipe can evenly provide gaseous state refrigerant for a plurality of compressors.

In order to achieve the above purpose, the utility model provides a following technical scheme: the air suction pipe is used for connecting a plurality of compressors, and is provided with an air inlet port and an air outlet port, wherein the air inlet port is used for providing gaseous refrigerant into the air suction pipe, and the air outlet port is connected with each compressor so as to distribute the gaseous refrigerant in the air suction pipe into each compressor.

Furthermore, the air suction pipe comprises a main pipe and branch pipes which correspond to the compressors one to one, the main pipe is provided with the air inlet port, the branch pipes are provided with the air outlet port and the air suction port, and the air suction port is located in the air suction pipe.

Furthermore, the air suction pipe extends along the length direction, the branch pipes extend along the radial direction and are arranged at intervals along the length direction, the air suction port and the air outlet port are located at two opposite ends of the extension direction of the branch pipes, and the air outlet port and the air inlet port are located on the same side of the air suction pipe.

Further, the main pipe is along radially extending, along length direction, the main pipe and a plurality of the branch pipes are located on the same straight line, and along radially each the depth that the branch pipe is embedded in the suction pipe is greater than the depth that the main pipe is embedded in the suction pipe.

Further, a plurality of the branch pipes are arranged at equal intervals along the length direction; and/or the main pipe is positioned in the middle of the air suction pipe, and the branch pipes are positioned on two sides of the main pipe; and/or, along the radial direction, each branch pipe is embedded into the suction pipe to the same depth; and/or, along the radial direction, each branch pipe is embedded into the air suction pipe until the air suction port is close to the inner wall of the air suction pipe.

Furthermore, along the radial direction, a baffle is arranged at one end of the main pipe opposite to the air inlet port, and the baffle is used for enabling the gaseous refrigerant to flow into the air suction pipe from the side wall of the main pipe after entering the main pipe from the air inlet port.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a block diagram of a low-temperature parallel heat pump vacuum evaporator according to a preferred embodiment of the present invention;

FIG. 2 is a block diagram of a compressor set in the low-temperature parallel heat pump vacuum evaporator shown in FIG. 1;

FIGS. 3 and 4 are perspective views of a compressor unit in the low temperature parallel heat pump vacuum evaporator shown in FIG. 1;

FIG. 5 is a perspective view of the suction duct of the compressor unit in the low temperature parallel heat pump vacuum evaporator shown in FIG. 1;

FIG. 6 is a perspective view of a heat exchanger in the low temperature parallel heat pump vacuum evaporator shown in FIG. 1;

FIG. 7 is a schematic structural diagram of a condensation tank in the low-temperature parallel heat pump vacuum evaporator shown in FIG. 1;

FIG. 8 is a block diagram showing the construction of a pressure reducing device and a distilled water tank in the low-temperature parallel heat pump vacuum evaporator shown in FIG. 1;

fig. 9 is an exploded perspective view of an evaporator tank in the low temperature parallel heat pump vacuum evaporator shown in fig. 1.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

It should be noted that: the terms such as "upper", "lower", "left", "right", "inner" and "outer" of the present invention are described with reference to the drawings, and are not intended to be limiting terms. In addition, the connection structure between the components in the following embodiments may adopt various existing mechanical connection methods, such as welding, screwing, etc., unless otherwise specified. Meanwhile, except for special description, the number and the functions of the valve structures, the sensors and the like can be selected according to actual needs.

Referring to fig. 1 to 9, a low-temperature parallel heat pump vacuum evaporator according to a preferred embodiment of the present invention includes an evaporator 1, wherein the evaporator 1 is provided with a steam outlet 11 and a concentrated solution outlet 12; the heat exchanger 3 is arranged in the evaporation tank 1 or outside the evaporation tank 1; the heat source device 4 is connected with the heat exchanger 3 through a pipeline and used for providing a heat exchange medium for the heat exchanger 3; and the pressure reducing device 2 is used for vacuumizing the evaporation tank.

In the present embodiment, it is preferable that the steam outlet 11 is provided at the top of the evaporation tank 1 and the concentrated liquid discharge port 12 is provided at the bottom of the evaporation tank 1. Preferably, the heat exchanger 3 is arranged inside the evaporation tank 1; indeed, in other embodiments, the heat exchanger 3 may be arranged outside the evaporation tank 1, such as a conventional tubular heat exchanger.

In the present embodiment, the heat source device 4 is a heat pump compressor, and specifically includes a compressor set and an air inlet port connected to the refrigeration device 5. The compressor unit includes a plurality of compressors 41 arranged in parallel, and indeed, in other embodiments, the number of the compressors 41 may be selected according to actual needs, and the integrated compressor unit 4 may employ compressors 41 with different sizes and ratios to provide more adjustment stages, so that the cold output is more smoothly and dynamically matched with the actual load.

Utility model human is in order to make the efficiency of every compressor 41 obtain abundant performance to improve the heat treatment efficiency of whole compressor unit 4, be equipped with breathing pipe 42 at inlet port department, breathing pipe 42 extends along length direction (X direction in fig. 5), breathing pipe 42 is equipped with inlet port 4211 and the port 4222 of giving vent to anger, inlet port 4211 is used for providing gaseous state refrigerant in to breathing pipe 42, the port 4222 of giving vent to anger connects every compressor 41, in order to distribute the gaseous state refrigerant in the breathing pipe 42 to every compressor 41. The gas refrigerant is distributed to each compressor 41 through the suction pipe 42, so that the uniform suction of the compressor 41 can be promoted, the efficiency of each compressor 41 can be fully exerted, the heat treatment efficiency of the whole compressor unit can be improved, the liquid impact can be prevented, and the service life of the compressor unit can be prolonged.

Referring to fig. 5, the suction pipe 42 includes a main pipe 421 and branch pipes 422 corresponding to the compressors 41 one to one, the main pipe 421 is provided with an air inlet port 4211, the branch pipes 422 have an air outlet port 4222 and a suction port 4221, and the suction port 4221 is located inside the suction pipe. That is, the gaseous refrigerant is introduced into the suction pipe 42 through the inlet port 4211 of the main pipe 421, and the suction port 4221 of each branch pipe 422 distributes the gaseous refrigerant in the suction pipe 42 to each compressor 41 through the outlet port 4222. With this arrangement, the gaseous refrigerant can be uniformly distributed to each of the compressors 41. In this embodiment, the number of the compressors 41 is four, and correspondingly, the number of the branch pipes 422 is also four; in other embodiments, the number of manifolds 422 is uniformly adjusted based on the number of compressors 41.

Referring to fig. 5, the air suction pipe 42 extends in the longitudinal direction, the air suction pipe 42 has a cylindrical shape, and the ends of the air suction pipe 42 in the longitudinal direction are provided with sealing heads 420, that is, the ends of the air suction pipe 42 in the longitudinal direction are closed. The branch pipes 422 extend in the radial direction (indicated by Y direction in fig. 5) and are spaced apart in the longitudinal direction, and the air suction port 4221 and the air outlet port 4222 are located at opposite ends of the extension direction of the branch pipes 422, that is, the air suction port 4221 of the branch pipe 422 is located in the air suction pipe 42, and the air outlet port 4222 and the air inlet port 4211 are located at the same side of the air suction pipe 42.

Alternatively, the main pipe 421 extends along the radial direction, and along the length direction, the main pipe 421 and the plurality of branch pipes 422 are located on the same straight line, and the depth of each branch pipe 422 embedded into the air suction pipe 42 along the radial direction is greater than the depth of the main pipe 421 embedded into the air suction pipe 42. This arrangement facilitates the distribution of the gaseous refrigerant in the suction pipe 42 to each compressor 41 through the discharge port 4222 by the suction port 4221 of each branch pipe 422.

Alternatively, the plurality of branched pipes 422 are arranged at equal intervals in the length direction. With this arrangement, the gaseous refrigerant can be uniformly distributed to each of the compressors 41.

Alternatively, the main pipe 421 is located at a middle position of the suction pipe 42, and the plurality of branch pipes 422 are located at both sides of the main pipe 421. That is, the gaseous refrigerant is collected at the middle position of the suction pipe 42, and then is diffused from the middle position of the suction pipe 42 to the branch pipes 422, and is supplied to each compressor 41 from each branch pipe 422. The uniform suction of the compressor 41 can be promoted, and the efficiency of each compressor 41 can be sufficiently exhibited. However, the position of the main pipe 421 and the position of the branch pipe 422 are not limited to this, and may be selected as needed.

Alternatively, each of the branched tubes 422 is embedded in the air suction pipe 42 to the same depth in the radial direction. So that the gaseous refrigerant can be uniformly delivered to each compressor 41 by each branched pipe 422.

Alternatively, each branch 422 is embedded in the suction pipe 42 in a radial direction to the suction port 4221 near the inner wall of the suction pipe 42. That is, the suction port 4221 of the branch pipe 422 sucks the gaseous refrigerant at the bottom of the suction pipe 42. This setting mode makes liquid fluid deposit in the gaseous refrigerant in the breathing pipe 42 bottom, and the gaseous refrigerant can be taken away by compressor 41 and liquid fluid can be taken away after vaporizing, can guarantee on the one hand that the gaseous refrigerant is given vent to anger evenly, and on the other hand can avoid liquefied water to get into to the branch 422 in, can effectively prevent compressor 41 liquid attack, protection compressor 41.

Alternatively, referring to fig. 5, a baffle 4212 is provided at an end of the main pipe 421 opposite to the air inlet port 4211 in the radial direction, and the baffle 4212 is used to allow the gaseous refrigerant to flow into the air suction pipe 42 from the side wall of the main pipe 421 after entering the main pipe 421 through the air inlet port 4211. That is, one end of the main pipe 421 opposite to the air inlet port 4211 is blocked in the radial direction, and after the gaseous refrigerant enters the main pipe 421 from the air inlet port 4211, the gaseous refrigerant flows into the air intake pipe 42 not in the radial direction but flows into the air intake pipe 42 from the side wall of the main pipe 421 and spreads all around.

The arrangement mode can ensure that the low-temperature and low-pressure gaseous refrigerant entering from the air inlet port 4211 is uniformly distributed to the upper part of the inner cavity of the air suction pipe 42 through the baffle 4212, when the upper part of the inner cavity of the air suction pipe 42 is fully filled with the gaseous refrigerant, the gaseous refrigerant is uniformly dispersed and then is diffused to the lower part of the inner cavity of the air suction pipe 42, and then enters the branch pipe 422 from the air suction port 4221 of the branch pipe 422, so that the gaseous refrigerant is uniformly distributed to each compressor 41. Alternatively, in the present embodiment, the air suction port 4221 is an oblique opening provided at the bottom of the branch pipe 422. Above-mentioned setting mode makes liquid fluid deposit in the gaseous refrigerant in the breathing pipe 42 bottom, and the gaseous refrigerant can be taken away by compressor 41 and liquid fluid can be taken away after vaporizing, can guarantee on the one hand that the gaseous refrigerant is given vent to anger evenly, and on the other hand can avoid liquefied water to get into to the branch 422 in, can effectively prevent compressor 41 liquid attack, protection compressor 41.

Optionally, the baffles 4212 extend lengthwise and project out of the side walls of the main tube 421. The portion of the baffle 4212 protruding out of the side wall of the main pipe 421 plays a guiding role, and guides the gaseous refrigerant to enter the main pipe 421 from the air inlet port 4211, and then to diffuse from the side wall of the main pipe 421 toward the periphery of the inner cavity of the air suction pipe 42.

The utility model discloses the people finds that compressor unit 4 is in the use, and fluid in it often can flow from compressor 41, and consequently, in this embodiment, the port play of giving vent to anger that is connected at compressor unit 4 and evaporating pot 1 is provided with oil separator 43, and is preferred, and every compressor 41 corresponds the adaptation respectively and is equipped with an oil separator 43. The oil separator 43 is connected to the air outlet port and the air inlet port through an oil circulation pipe, and a valve 431, an oil filter 432, and an electronic oil level balancer 433 are provided on the oil circulation pipe. The high-temperature and high-pressure heat exchange medium pressed out by the compressor 41 firstly passes through the oil separator 43 to separate oil from the medium, and the compressors 41 with different sizes and proportions can realize stable oil return through the corresponding oil separators 43, so that the compressor 41 is ensured to work stably and has long service life. In this embodiment, the outlet port of the compressor unit 4 may also be provided with an exhaust pipe 44 to uniformly exhaust air, the exhaust pipe 44 is connected to the evaporation tank 1 and each oil separator 43, and the high-temperature and high-pressure heat exchange medium from which the oil is separated uniformly enters the exhaust pipe 44 and then enters the heat exchanger 3 through a pipeline.

In this embodiment, the heat exchanger 3 in the evaporation tank 1 is a coil heat exchanger, which is connected to the exhaust pipe 44 and the refrigeration device 5, and further, the coil heat exchanger is formed by a plurality of mosquito coil coils 31 arranged in parallel and in parallel along the axial direction (shown in the Z direction in fig. 6). Specifically, the coil heat exchanger includes a mosquito coil 31, a fixing device 32, and a first pipe 33 and a second pipe 34. The mosquito coil coils 31 are vertically and parallelly fixed on the fixing device 32, the first pipeline 33 and the second pipeline 34 are arranged on the periphery of the mosquito coil coils 31, the axial direction of the first pipeline 33 and the second pipeline 34 is perpendicular to the radial direction (shown in the direction M in fig. 6) of the mosquito coil coils 31, and through holes (not shown) for respectively connecting each mosquito coil 31 are arranged on the first pipeline 33 and the second pipeline 34. The heat exchange medium is uniformly distributed into each mosquito coil 31 through the first pipeline 33 and then collected and output from the second pipeline 34.

In this embodiment, each coil 31 is configured to output fluid from the inside of the coil 31 to the outside, specifically, the inside of the coil 31 is connected to the first pipe 33, and the outside of the coil 31 is connected to the second pipe 34. By adopting the arrangement mode, the system pressure drop caused by the fluid in the mosquito coil 31 can be avoided, thereby ensuring the stability of the heat exchange efficiency.

In this embodiment, the fixing device 32 corresponds to a plurality of fixing plates 321 arranged at intervals along the circumferential direction (shown by the direction N in fig. 6) of the mosquito coil 31 and a positioning plate 322 arranged on the outer periphery of the mosquito coil 31, each fixing plate 321 is arranged to extend along the radial direction M, a slot 3211 corresponding to the diameter of the mosquito coil 31 is arranged on the fixing plate 321, and the fixing plate 321 is fixed on the positioning plate 322. Specifically, a plurality of locating plates 322 evenly set up in mosquito-repellent incense coil 31's periphery (in this embodiment, adopt four locating plates 322 evenly to set up in mosquito-repellent incense coil 31's periphery), and fixed plate 321 sets up layer by layer in the vertical direction of locating plate 322, and every mosquito-repellent incense coil 31's pipeline is held in the draw-in groove 3211 circle by circle. Preferably, a gap is formed between adjacent mosquito coil pipes 31, so that the heat exchange area is increased and the later maintenance is facilitated.

The traditional coil heat exchanger has the advantages that when the rated heat exchange area is fixed, the span of a single whole group of coils is large, so that the manufacturing difficulty is large, the energy of a heat exchange medium cannot be fully converted, and the heat exchange efficiency is low. And the multiunit mosquito coil 31 of this application connects in parallel and parallel arrangement, and reducible its span and refrigerant (also be heat transfer medium) are at the circulation distance of its in, guarantee that its heat exchange efficiency is high and stable, are convenient for make simultaneously and dismouting installation to make things convenient for later maintenance and maintenance.

In this embodiment, the low-temperature parallel heat pump vacuum evaporator further comprises a condensation tank 6 respectively connected with the refrigerating device 5 and the compressor unit 4 and a distilled water tank 7 connected with the condensation tank 6, the steam outlet 11 is connected with the condensation tank 6, and the pressure reducing device 2 is connected and arranged on the distilled water tank 7. The refrigerating device 5 is preferably an electronic expansion valve which is respectively connected with the heat exchanger 3 and the condensing tank 6, the heat exchange medium enters the heat exchanger 3 from the condensing tank 6 through the compressor unit 4 through a pipeline, in the process, the low-temperature gaseous heat exchange medium is compressed into high-temperature and high-pressure liquid and/or gaseous state, so that a large amount of heat is released, and then the heat exchange medium exchanges heat with the waste liquid in the evaporating tank 1 in the heat exchanger 3 to heat the waste liquid. Then, the liquid heat exchange medium flows through the electronic expansion valve 5 through a pipeline and enters the condensing tank 6, in the process, the liquid heat exchange medium with medium temperature and high pressure is converted into a gaseous heat exchange medium with low temperature and low pressure through the throttling function of the electronic expansion valve 5, and simultaneously a large amount of external heat is absorbed, so that heat exchange is carried out on steam from the evaporating tank 1 in the condensing tank 6, the temperature of the steam is reduced, and the cooling effect is achieved.

In the present embodiment, the condensation tank 6 includes an outer cylinder 61 and a cold water pipe group 62 provided in the outer cylinder 61 and connected to the evaporation tank 1 and the distilled water tank 7, and the steam generated in the evaporation tank 1 enters the cold water pipe group 62 through a pipe, is cooled by the heat medium in the outer cylinder 61, and then enters the distilled water tank 7. The pressure reducing device 2 of the present embodiment includes a centrifugal water pump 21 and a water jet 22, wherein the water jet 22 is connected to the condensation tank 6 and the distilled water tank 7, and the centrifugal water pump 21 is connected to the distilled water tank 7, the water jet 22, and the distilled water discharge pipe 72. Preferably, the distilled water tank 7 is also provided with a heat exchanger 3 for cooling the steam not cooled in the condensation tank 6, the heat exchanger 3 is provided with a refrigerant therein and connected with a cooling device 71, and the cooling device 71 circularly cools the refrigerant to lower the temperature of the distilled water in the distilled water tank 7. The cooling device 71 may be a heat pump system, or may be other cooling devices, such as a semiconductor cooling plate. The number of coils in the heat exchanger 3 in the distilled water tank 7 can be selected according to actual needs. The distilled water stored in the distilled water tank 7 is cooled to a predetermined temperature and then discharged through a distilled water discharge pipe 72.

In this embodiment, in order to avoid the evaporated water vapor from carrying other insoluble particles into the condensation tank 6 and the distilled water tank 7, a steam purification device 13 is further provided in the evaporation tank 1. Specifically, this steam purification device 13 sets up in the top of heat exchanger 3, the below of steam outlet 11, and it includes along a plurality of baffle 131 of preventing smuggleing secretly of 1 vertical direction dislocation set in heat exchanger 3 top of evaporating pot to and set up at the filter purifier 132 of preventing smuggleing secretly taking baffle 131 top. The anti-pinch baffle 131 includes at least two partition plates disposed above the heat exchanger 3 in a staggered manner in the vertical direction, and in the present embodiment, the upper partition plate 1311 and the lower partition plate 1312 are provided, and the upper partition plate 1311 and the lower partition plate 1312 are disposed in a staggered manner in the vertical direction. During the rising process of the steam formed by the evaporation of the wastewater, the foam and other impurities are blocked by the partition plates and attached to the partition plates, and the gas continues to rise through the space between the upper partition plate 1311 and the lower partition plate 1312. Indeed, in other embodiments, a greater number of baffles may be used.

The filter purifier 132 of this embodiment comprises a filler support net plate 1321 disposed above the anti-pinch baffle 131 and a purifying filler 1322 placed on the filler support net plate 1321, in this embodiment, the purifying filler 1322 is preferably implemented by using a pall ring labyrinth filler. The evaporation tank 1 is provided with a manhole 14 at a corresponding position, and the pall ring labyrinth packing can be added and replaced through the manhole 14. Compare in traditional silk screen demister, adopt the structure of this embodiment, can not the scale deposit and block up and removable reuse, maintenance and maintenance cost reduce.

In this embodiment, the evaporation tank 1 is composed of three parts, namely an upper tank body 15, a middle tank body 16 and a lower tank body 17, and the upper tank body 15 and the middle tank body 16 and the lower tank body 17 are mechanically connected through flanges 18 so as to facilitate disassembly, maintenance and repair. Wherein, the steam outlet 11 is arranged at the top of the upper tank body 15, and the concentrated solution outlet 12 is arranged at the bottom of the lower tank body 17. In addition, the evaporating pot 1 is further provided with a through hole connected with the compressor unit 4, and is used for installing installation holes of devices such as sensors, monitors, valves and the like, a waste liquid inlet pipeline 18, a defoaming agent inlet pipeline, a cleaning agent inlet pipeline and the like, and the through hole, the waste liquid inlet pipeline, the defoaming agent inlet pipeline, the cleaning agent inlet pipeline and the like are all in the prior art and are not explained herein.

To sum up, the utility model discloses a parallelly connected heat pump vacuum evaporator of low temperature has following advantage:

1) by arranging the compressor unit, a plurality of compressors are connected in parallel, overlapped and integrated, so that the output energy of the integrated compressor unit is increased, and the processing capacity of the evaporator is improved on the premise of ensuring high energy efficiency;

2) the integrated compressor unit can adopt compressors with unequal size ratios to provide more adjustment stages, so that the cold output is more smoothly and dynamically matched with the actual load;

3) the air suction header is arranged at the air inlet of the compressor unit, so that the uniform air suction and oil return of the compressor can be promoted, and the liquid impact can be prevented, so that the service life of the compressor unit is prolonged;

4) a steam purification device is arranged below a steam outlet of the evaporation tank, so that the effluent quality of the evaporation system is improved; and the filtration purifier adopts the purification filler to purify the steam, avoids producing the scale deposit when purifying efficiently, and removable reuse, maintenance and maintenance cost reduce.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (6)

1. An air suction pipe for connecting a plurality of compressors is provided with an air inlet port for supplying a gaseous refrigerant into the air suction pipe and an air outlet port for connecting each of the compressors to distribute the gaseous refrigerant in the air suction pipe to each of the compressors.

2. The suction pipe according to claim 1, wherein said suction pipe comprises a main pipe provided with said inlet port and branch pipes having said outlet port and said suction port in one-to-one correspondence with said compressors, said suction pipe being positioned inside said suction pipe.

3. The suction duct of claim 2, wherein said suction duct extends along a length direction, a plurality of said branch ducts extend radially and are spaced apart along said length direction, said suction port and said discharge port are located at opposite ends of said branch ducts in said extension direction, and said discharge port are located on the same side of said suction duct.

4. The suction duct of claim 3, wherein said main duct extends in said radial direction, said main duct and said plurality of branch ducts are aligned in said longitudinal direction, and each of said branch ducts is inserted into said suction duct to a greater depth in said radial direction than said main duct.

5. The suction duct of claim 4, wherein a plurality of said manifolds are equally spaced along said length; and/or the main pipe is positioned in the middle of the air suction pipe, and the branch pipes are positioned on two sides of the main pipe; and/or, along the radial direction, each branch pipe is embedded into the suction pipe to the same depth; and/or, along the radial direction, each branch pipe is embedded into the air suction pipe until the air suction port is close to the inner wall of the air suction pipe.

6. The suction tube as claimed in claim 4, wherein a baffle is provided at an end of said main tube opposite to said inlet port in said radial direction, said baffle being adapted to allow said gaseous refrigerant to flow from a side wall of said main tube into said suction tube after entering said main tube from said inlet port.

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