Centrifugal compressor

Abstract

The invention provides a centrifugal compressor, relates to the technical field of fluid machinery, and aims to solve the problem that the centrifugal compressor in the prior art is high in running cost due to external cooling water, the centrifugal compressor comprises an interstage intercooler, a high-speed centrifugal motor, a cooling fan, a cooler, a water pump and a water tank, the water inlet ends of the interstage intercooler and the high-speed centrifugal motor are connected with the water tank through water inlet pipelines, and the water outlet ends of the interstage intercooler and the high-speed centrifugal motor are connected with the water tank through water outlet pipelines. The water pump and the cooler are sequentially arranged on the water inlet pipeline, the water pump is arranged at the end close to the water tank, and the cooling fan is arranged right opposite to the cooler. According to the centrifugal compressor, the equipment structure is effectively simplified, the operation cost is reduced, and meanwhile cooler blockage and machine damage caused by the water quality problem are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and particularly to a centrifugal compressor. Background Art

[0002] A centrifugal compressor is a fluid machinery widely used in the industrial field, mainly used for the compression and transportation of gases. In a centrifugal compressor, the temperature of the gas rises significantly after multi-stage compression, resulting in a decrease in thermal efficiency.

[0003] Although the traditional external cooling system can reduce the gas temperature, there are problems such as low cooling efficiency and high energy consumption, and it cannot make full use of the heat generated during the compression process. For example, in the prior art, the cooling system usually adopts an external cooling tower or cooler, and the cooling effect is greatly affected by the ambient temperature, and a large amount of heat is dissipated during the cooling process, resulting in a low overall thermal efficiency.

[0004] The existing cooling systems usually require an external cooling water source, resulting in a complex equipment structure and high installation and maintenance costs. In addition, the quality of the externally connected cooling water is difficult to guarantee. The water may contain impurities, minerals or microorganisms, which are likely to form scale or blockages inside the cooler, affecting the cooling effect and even causing machine damage. For example, the scale inside the cooler will reduce the heat exchange efficiency, increase energy consumption, and may even cause the cooler to be blocked, affecting the normal operation of the compressor.

[0005] The cooling capacity of the existing cooling systems is limited. Especially in the high-temperature environment in summer, the cooling effect further decreases, resulting in too high temperature inside the compressor, and it is easy to have problems such as heat stress concentration, component deformation and even high-temperature shutdown. For example, in the high-temperature conditions in summer, the cooling efficiency of the external cooling system is significantly reduced, and the compressor is prone to automatic shutdown due to excessive temperature during long-term operation, affecting the continuity of production.

[0006] Furthermore, the external cooling water system requires a continuous water source supply, resulting in high operating costs. Especially in areas with water shortages, the application scope is severely limited. In addition, the externally connected cooling water is usually tap water, which contains corrosive substances such as chloride ions, and is likely to cause corrosion of the aluminum components inside the compressor (such as the motor housing, cooler, etc.), shortening the service life of the equipment. For example, the aluminum motor housing is prone to corrosion perforation after long-term contact with tap water, resulting in equipment failure.

[0007] In addition, a centrifugal compressor will generate relatively large noise during high-speed operation, especially at the air inlet. In the prior art, although the internal structure is improved to reduce noise, there is still a large room for improvement in intake noise reduction. For example, the air flow turbulence and high-speed impact at the air inlet will generate high-frequency noise, affecting the comfort of the working environment and even causing damage to the hearing of the operator.

[0008] Therefore, existing centrifugal compressors have problems such as low thermal efficiency, complex cooling systems, insufficient machine stability, high operating costs of external cooling water, and high operating noise. To address the above problems, the present invention proposes a centrifugal two-stage compressor with an inter-stage intercooler. Summary of the Invention

[0009] The purpose of the present invention is to provide a centrifugal compressor to solve the problem of high operating costs of external cooling water in existing centrifugal compressors. The centrifugal compressor of the present invention effectively simplifies the equipment structure, reduces the operating costs, and at the same time avoids the blockage of the cooler and machine damage caused by water quality problems.

[0010] A centrifugal compressor provided by the present invention includes an inter-stage intercooler, a high-speed centrifugal motor, a cooling fan, a cooler, a water pump, and a water tank. The water inlet ends of the inter-stage intercooler and the high-speed centrifugal motor are respectively connected to the water tank through water inlet pipelines, and the water outlet ends of the inter-stage intercooler and the high-speed centrifugal motor are respectively connected to the water tank through water outlet pipelines. The water pump and the cooler are sequentially arranged on the water inlet pipeline, and the water pump is arranged at one end close to the water tank. The cooling fan is arranged opposite to the cooler.

[0011] As a preferred embodiment of the present invention, at least two cooling fans and coolers are respectively provided, and the two coolers are connected in series on the water outlet pipeline.

[0012] As a preferred embodiment of the present invention, an air inlet passage and an air outlet passage are further included. The air inlet passage and the air outlet passage are respectively connected to the air inlet and air outlet of the high-speed centrifugal motor. The air inlet passage has a bent structure, and the length of the air inlet passage is greater than the length of the air outlet passage.

[0013] As a preferred embodiment of the present invention, the air inlet passage has an "L" shaped structure.

[0014] As a preferred embodiment of the present invention, sound-absorbing cotton is provided on the outer side of the air inlet passage, and the sound-absorbing cotton extends along the length direction of the air inlet passage.

[0015] As a preferred embodiment of the present invention, a first-stage compressor head and a second-stage compressor head are respectively provided at both ends of the high-speed centrifugal motor, and the first-stage compressor head and the second-stage compressor head are respectively connected to both ends of the inter-stage intercooler.

[0016] As a preferred embodiment of the present invention, it further includes a chassis, which includes a first accommodation cavity and a second accommodation cavity therein. The inter-stage intercooler, the intake passage, the exhaust passage and the high-speed centrifugal motor are all installed in the first accommodation cavity, and the cooling fan, the cooler, the water pump and the water tank are installed in the second accommodation cavity.

[0017] As a preferred embodiment of the present invention, the intake passage is arranged along the inner wall of the first accommodation cavity, and the bent part of the intake passage is arranged corresponding to the corner of the first accommodation cavity.

[0018] As a preferred embodiment of the present invention, the cooler is arranged close to the inner wall of the second accommodation cavity and corresponds to the window of the chassis, and the cooling fan is arranged in the second accommodation cavity opposite to the cooler.

[0019] As a preferred embodiment of the present invention, the coolant in the inter-stage intercooler and the high-speed centrifugal motor is an ethylene glycol aqueous solution or a cooling oil.

[0020] Compared with the prior art, the present invention has the following positive effects: The centrifugal compressor provided by the present invention includes an inter-stage intercooler, a high-speed centrifugal motor, a cooling fan, a cooler, a water pump and a water tank. The water inlet ends of the inter-stage intercooler and the high-speed centrifugal motor are respectively connected to the water tank through water inlet pipelines, and the water outlet ends of the inter-stage intercooler and the high-speed centrifugal motor are respectively connected to the water tank through water outlet pipelines. The water pump and the cooler are sequentially arranged on the water inlet pipeline and the water pump is arranged at one end close to the water tank, and the cooling fan is arranged opposite to the cooler. The centrifugal compressor in the present invention realizes efficient cooling of the inter-stage intercooler through a built-in self-circulating cooling water system, significantly reduces the gas temperature, and improves the thermal efficiency of the compressor. Integrating the cooling water system inside the compressor eliminates the need for an external cooling water source, simplifies the equipment structure, reduces the installation and maintenance costs, and at the same time avoids the blockage of the cooler and machine damage caused by water quality problems. The built-in self-circulating cooling water system operates independently and is not restricted by external water sources, expanding the application scenarios of the equipment, especially suitable for areas with water shortages, and at the same time avoiding the corrosion of aluminum components by tap water. Through the efficient built-in cooling system, the cooling of both the inter-stage cooler and the high-speed centrifugal motor is taken into account, ensuring that the compressor can still operate stably in a high-temperature environment (such as in summer), and avoiding high-temperature shutdown problems caused by insufficient cooling. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the air flow passage and the overall structure of the centrifugal compressor of the present invention; Figure 2 It is a schematic diagram of the built-in cooling system of the present invention; Figure 3 It is a schematic structural diagram of the connection between the high-speed centrifugal motor and the inter-stage intercooler of the present invention. In the figure: 1, chassis; 2, intake passage; 3, exhaust passage; 4, inter-stage intercooler; 5, anti-surge valve; 6, high-speed centrifugal motor; 7, water tank; 8, first cooler; 9, first cooling fan; 10, water pump; 11, second cooling fan; 12, second cooler; 13, second-stage compressor head; 14, high-speed motor water outlet; 15, high-speed motor water inlet; 17, first-stage compressor head; 18, inter-stage intercooler water inlet; 19, inter-stage intercooler water outlet; 101, first accommodation cavity; 102, second accommodation cavity. Detailed implementation manners

[0023] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The following will further elaborate on the detailed implementation manners of the present invention with reference to the drawings.

[0026] Embodiment 1: A centrifugal compressor provided in this embodiment, as Figures 1 - 3 shown, includes an inter-stage intercooler 4, a high-speed centrifugal motor 6, a cooling fan, a cooler, a water pump 10, and a water tank 7. Among them, the water tank is used to store the coolant to ensure that there is enough cooling medium in the cooling system. The water pump is used to drive the coolant to circulate in the system. The cooling fan is used to perform forced air cooling on the coolant to improve the heat dissipation efficiency. The cooler is used for heat exchange between the coolant and the air.

[0027] The water inlet ends of the inter-stage intercooler 4 and the high-speed centrifugal motor 6 are respectively connected to the water tank 7 through water inlet pipelines, and the water outlet ends of the inter-stage intercooler 4 and the high-speed centrifugal motor 6 are respectively connected to the water tank 7 through water outlet pipelines. The water pump 10 and the cooler are sequentially arranged on the water inlet pipeline, and the water pump 10 is arranged at one end close to the water tank 7. The cooling fan is arranged opposite to the cooler. Specifically, an inter-stage intercooler water inlet 18 and an inter-stage intercooler water outlet 19 are provided at both ends of the inter-stage intercooler 4. The coolant enters the inter-stage intercooler 4 from the inter-stage intercooler water inlet 18 and then flows out from the inter-stage intercooler water outlet 19, thereby exchanging heat with the high-temperature gas passing through the inter-stage intercooler 4. A high-speed motor water outlet 14 and a high-speed motor water inlet 15 are provided on the high-speed centrifugal motor 6. The coolant enters the high-speed centrifugal motor 6 from the high-speed motor water inlet 15 to exchange heat with the high-temperature gas passing through the high-speed centrifugal motor 6 and then flows out from the high-speed motor water outlet 14.

[0028] The cooling fan, the cooler, the water pump 10, and the water tank 7 in the centrifugal compressor of this embodiment form the core components of the cooling system. Their main task is to provide high-quality and efficient cooling water for the inter-stage intercooler and the high-speed centrifugal motor for heat exchange. The coolant circulation path of this embodiment: The coolant is pumped out of the storage water tank 7 by the water pump 10 and introduced into the cooler through a pipeline. In the cooler, the coolant dissipates heat into the air through the forced air cooling effect of the cooling fan to achieve the cooling of the coolant. The cooled coolant is respectively introduced into the inter-stage intercooler 4 and the high-speed centrifugal motor 6 through the water inlet pipeline to absorb the heat generated by them. After absorbing the heat, the temperature of the coolant rises and is collected back to the storage water tank 7 through the water outlet pipeline, thereby realizing the circulation of the coolant.

[0029] In this embodiment, the centrifugal compressor realizes efficient cooling of the inter-stage intercooler 4 through a built-in self-circulating cooling water system, significantly reducing the gas temperature and improving the thermal efficiency of the compressor. Integrating the cooling water system inside the compressor eliminates the need for an external cooling water source, simplifies the equipment structure, reduces installation and maintenance costs, and at the same time avoids the blockage of the cooler and machine damage caused by water quality problems. The built-in self-circulating cooling water system operates independently and is not restricted by external water sources, expanding the application scenarios of the equipment, especially suitable for areas with water shortages, and at the same time avoiding the corrosion of aluminum components by tap water. Through an efficient built-in cooling system, both the inter-stage intercooler and the high-speed centrifugal motor are cooled, ensuring that the compressor can still operate stably in a high-temperature environment (such as in summer), and avoiding high-temperature shutdown problems caused by insufficient cooling.

[0030] In this embodiment of the centrifugal compressor, the cooling method adopts a built-in self-circulating cooling water system, which can solve the problems of low thermal efficiency, complex cooling system, and insufficient machine stability in the prior art.

[0031] As a preferred embodiment, at least two heat dissipation fans and coolers are respectively provided, and the two coolers are connected in series on the outlet pipeline.

[0032] As a preferred embodiment, the coolant in the inter-stage intercooler 4 and the high-speed centrifugal motor 6 is an ethylene glycol aqueous solution or a cooling oil.

[0033] The coolant is selected as a high-quality cooling medium with high thermal conductivity and low corrosiveness. Preferably, the coolant is an ethylene glycol aqueous solution or a special cooling oil to ensure the cooling effect and extend the service life of the equipment.

[0034] Preferably, the cooling water system of the centrifugal compressor in this embodiment has a temperature sensor and an automatic control module, which real-time monitors the temperature of the coolant and adjusts the operating states of the water pump 10 and the heat dissipation fan as needed to ensure stable cooling effect.

[0035] As a preferred embodiment, this embodiment of the centrifugal compressor further includes an intake passage 2 and an exhaust passage 3. The intake passage 2 and the exhaust passage 3 are respectively connected to the intake port and the exhaust port of the high-speed centrifugal motor 6. The intake passage 2 has a bent structure, and the length of the intake passage 2 is greater than the length of the exhaust passage 3. Preferably, an anti-surge valve 5 is provided on the bypass of the exhaust passage 3. When the flow rate drops to a certain safety lower limit, the anti-surge valve automatically opens the vent valve to the atmosphere or the bypass valve that returns to the inlet, increasing the flow rate through the air compressor and preventing it from entering the surge zone.

[0036] The gas enters from the inlet of the intake passage 2 and reaches the compressor suction port after passing through the long intake passage 2. The gas is effectively buffered in the intake passage, reducing the high-frequency noise at the intake port.

[0037] As a preferred embodiment, the intake passage 2 has an "L" - shaped structure. The "L" - shaped intake passage 2 can guide the gas to change its flow direction before the air enters the intake port of the high - speed centrifugal motor 6, extend the airflow path, and further reduce high - frequency noise.

[0038] As a preferred embodiment, sound - absorbing cotton is provided on the outer side of the intake passage 2, and the sound - absorbing cotton extends along the length direction of the intake passage 2. Among them, the sound - absorbing cotton is made of porous materials such as fiberglass or polyester fiber, and has excellent sound - absorbing performance.

[0039] The gas enters from the inlet of the "L" - shaped passage and reaches the compressor suction port after passing through a longer passage. When the airflow passes through the "L" - shaped passage, the high - frequency noise will be refracted and reflected multiple times and gradually absorbed by the sound - absorbing cotton. In this embodiment, the entire inner cavity of the "L" - shaped passage is arranged with highly efficient noise - reducing sound - absorbing cotton to absorb and attenuate the high - frequency noise generated during the intake process. Through the extension of the airflow path and the function of the sound - absorbing cotton, the high - frequency noise at the intake port is significantly reduced, improving the comfort of the working environment.

[0040] In this embodiment, by adopting an innovative "L" - shaped intake noise - reduction structure at the intake port, adding a porous muffler and highly efficient sound - absorbing and noise - reducing cotton, the noise generated during the intake process is effectively reduced, providing a quieter and more comfortable use environment for users.

[0041] As a preferred embodiment, at both ends of the high - speed centrifugal motor 6, there are a first - stage compressor head 17 and a second - stage compressor head 13 respectively. The first - stage compressor head 17 and the second - stage compressor head 13 are respectively connected to both ends of the inter - stage intercooler 4. Among them, the high - speed centrifugal motor 6 adopts an ultra - high - speed permanent - magnet motor, and uses an ultra - high - speed air - floating bearing as the transmission system to drive the centrifugal impeller to work.

[0042] As a preferred embodiment, the centrifugal compressor in this embodiment further includes a chassis 1. Inside the chassis 1, there are a first accommodation cavity 101 and a second accommodation cavity 102. The inter - stage intercooler 4, the intake passage 2, the exhaust passage 3, and the high - speed centrifugal motor 6 are all installed in the first accommodation cavity 101. The cooling fan, the cooler, the water pump 10, and the water tank 7 are installed in the second accommodation cavity 102. The chassis 1 has a rectangular frame - like structure. The inlet of the intake passage 2 and the outlet of the exhaust passage 3 are respectively located on two different sides of the first accommodation cavity 101.

[0043] In this embodiment, by separately arranging the cooling water system and the gas - path flow path, the internal design of the chassis 1 is more reasonable and convenient for maintenance.

[0044] When the compressor in this embodiment operates, it sucks air from the inlet of the "L"-shaped intake passage 2. After being compressed by the first-stage compressor head 17, the high-temperature and high-pressure gas is introduced into the inter-stage intercooler 4. After heat exchange through the built-in circulating cooling system in the inter-stage intercooler 4, the low-temperature and high-pressure gas is introduced into the second-stage compressor head 13 for further compression, thereby achieving nearly isothermal compression in the second stage of the compressor and maximizing the improvement of the compressor's thermal efficiency. Finally, it is sent to the application end through the exhaust passage 3. As a preferred embodiment, the intake passage 2 is arranged along the inner wall of the first accommodation cavity, and the bent portion of the intake passage 2 is arranged corresponding to the corner of the first accommodation cavity. As Figure 1 shown, the air inlet of the compressor is arranged on the side wall of the first accommodation cavity. The air inlet of the chassis 1 is connected to the intake passage 2. The intake passage 2 is "L"-shaped, and its two sides are respectively arranged along the two side walls of the first accommodation cavity, thereby effectively extending the length of the intake passage 2.

[0045] As a preferred embodiment, the cooler is arranged against the inner wall of the second accommodation cavity and corresponds to the window of the chassis. Specifically, the cooler includes a first cooler 8 and a second cooler 12, and the cooling fan includes a first cooling fan 9 and a second cooling fan 11. The first cooling fan is arranged facing the first cooler, and the second cooling fan is arranged facing the second cooler. The first cooler and the second cooler are respectively arranged on the two side walls of the second accommodation cavity 102, so that the heat of the cooler can be fully released outside the chassis 1, improving the heat dissipation effect.

[0046] The working principle of the internal cooling system of the centrifugal compressor in this embodiment is as follows: The high-quality coolant in the water tank 7 is introduced into the cooler through the water pump 10. The coolant in the cooler is cooled by the cooling fan; the cooled coolant is introduced into the inter-stage intercooler and the high-speed centrifugal motor for cooling the inter-stage intercooler and the high-speed centrifugal motor; then the heated coolant after cooling and heat exchange is collected and returned to the water tank 7, and then introduced into the cooler by the water pump 10 for heat dissipation, and so on in a cyclic closed loop.

[0047] The compressor inlet in this embodiment adopts an "L"-shaped inlet passage, and the compressor air inlet is arranged at the outermost end of the "L" shape; highly efficient noise reduction and sound absorption cotton are arranged in the inner cavity of the entire "L"-shaped passage. When the compressor operates and sucks air, the length of the inlet air flow passage becomes longer, and the high-frequency noise at the air inlet will passively undergo refraction and be adsorbed and reduced by the highly efficient sound absorption cotton in the inner cavity.

[0048] The centrifugal two-stage compressor with an inter-stage intercooler in this embodiment adopts an internal self-circulating cooling water system for cooling, and has a unique intake noise reduction design. By optimizing the structure and operation mode of the cooling system, the thermal efficiency of the compressor is improved, the equipment structure is simplified, the machine stability is enhanced, and the noise is reduced, thereby improving the overall performance and service life of the equipment, and it is applicable to fields such as industrial refrigeration, petrochemical industry, and energy power.

[0049] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art in this technical field can make several deformations and improvements without departing from the creative concept of the present invention, and all should be covered within the protection scope of the present invention.

Claims

1. A centrifugal compressor, characterized in that: The invention comprises an interstage intercooler (4), a high-speed centrifugal motor (6), a heat dissipation fan, a cooler, a water pump (10) and a water tank (7); the water inlet ends of the interstage intercooler (4) and the high-speed centrifugal motor (6) are respectively connected to the water tank (7) via a water inlet pipeline; the water outlet ends of the interstage intercooler (4) and the high-speed centrifugal motor (6) are respectively connected to the water tank (7) via a water outlet pipeline; the water pump (10) and the cooler are sequentially arranged on the water inlet pipeline and the water pump (10) is arranged at one end close to the water tank (7); and the heat dissipation fan is arranged opposite to the cooler.

2. A centrifugal compressor according to claim 1, characterized in that: At least two of the heat dissipation fans and the coolers are provided respectively, and the two coolers are connected in series to the water outlet pipeline.

3. A centrifugal compressor according to claim 1, characterized in that: It also comprises an air intake channel (2) and an air exhaust channel (3), wherein the air intake channel (2) and the air exhaust channel (3) are respectively connected to the air intake port and the air exhaust port of the high-speed centrifugal motor (6), the air intake channel (2) is a bent structure, and the length of the air intake channel (2) is greater than the length of the air exhaust channel (3).

4. A centrifugal compressor according to claim 3, characterized in that: The air intake passage (2) has an "L"-shaped structure.

5. A centrifugal compressor according to claim 3, characterized in that: Sound-absorbing cotton is arranged on the outside of the air intake channel (2), and the sound-absorbing cotton is extended along the length direction of the air intake channel (2).

6. A centrifugal compressor according to claim 1, characterized in that: A first-stage compressor head (17) and a second-stage compressor head (13) are respectively provided at both ends of the high-speed centrifugal motor, and the first-stage compressor head (17) and the second-stage compressor head (13) are respectively connected to both ends of the interstage intercooler (4).

7. A centrifugal compressor according to claim 3, characterized in that: The invention also comprises a chassis (1), wherein the chassis (1) comprises a first accommodating chamber and a second accommodating chamber, wherein the interstage intercooler (4), the air intake passage (2), the exhaust passage (3) and the high-speed centrifugal motor (6) are all installed in the first accommodating chamber, and the heat dissipation fan, the cooler, the water pump (10) and the water tank (7) are installed in the second accommodating chamber.

8. A centrifugal compressor according to claim 7, characterized in that: The air intake channel (2) is arranged along the inner wall of the first accommodating cavity, and the bending part of the air intake channel is arranged corresponding to the corner of the first accommodating cavity.

9. A centrifugal compressor according to claim 7, characterized in that: The cooler is arranged close to the inner wall of the second accommodating cavity and corresponds to the window of the chassis, and the heat dissipation fan is arranged in the second accommodating cavity facing the cooler.

10. A centrifugal compressor according to claim 1, characterized in that: The coolant in the interstage intercooler (4) and the high-speed centrifugal motor (6) is ethylene glycol aqueous solution or cooling oil.

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