Oil mist removing device for centrifugal compressor

Abstract

The oil mist removing device comprises a first connecting pipe, an injection nozzle assembly, a second connecting pipe, a mixing pipe and an outlet pipe, the injection nozzle assembly is arranged on the first connecting pipe and used for injecting high-pressure gas, the second connecting pipe is arranged at the gas outlet end of the first connecting pipe, and the mixing pipe is arranged at the gas outlet end of the second connecting pipe. The mixing pipe is arranged on the second connecting pipe and used for mixing and discharging high-pressure gas and air containing oil mist, and the outlet pipe is arranged on the mixing pipe and used for being connected with a filter. According to the device, oil mist in the oil tank is pumped out through the Venturi effect, a motor in the prior art is replaced, and the requirement for application occasions with the anti-explosion requirement is met.

Description

Technical Field

[0001] The utility model relates to an oil mist removal device for a centrifugal compressor. Background Art

[0002] In centrifugal compressors, the high-speed rotation of components (such as bearings and gears) stirs the lubricating oil and produces tiny oil droplets, which mix in the air to form oil mist. In addition, when the oil returns to the oil tank, the temperature of the oil usually rises by at least 20 to 30°C due to the heat generated by the compressor and the friction in the system. This high temperature makes the oil more easily vaporized, thus forming oil mist. If the oil mist cannot be discharged in time, it will lead to: 1. The pressure in the oil tank increases, affecting the return oil and thus affecting the work efficiency; 2. The increase in the pressure in the oil tank affects the stability of the labyrinth seal connected to it, which may cause oil leakage in the seal; 3. Direct discharge of oil mist will cause environmental pollution. The common method of removing oil mist is to use an electric fan to forcibly extract the oil mist-containing air in the oil tank and discharge it into the atmosphere after passing through an oil filter. If this method uses a conventional ordinary motor, it cannot meet the application occasions with explosion-proof requirements, does not meet the national explosion-proof design standards (such as GB 3836 series standards and GB 50058-2014), and has certain safety hazards. If it is replaced with an explosion-proof motor, it will increase production costs. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] The technical problem to be solved by the utility model is how to solve the problem that the existing centrifugal compressor oil mist removal equipment often cannot meet the application occasions with explosion-proof requirements, does not meet the national explosion-proof design standards, and has safety hazards, while the cost of replacing it with an explosion-proof motor increases significantly.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an oil mist removal device for a centrifugal compressor, comprising a first connecting pipe, an ejection nozzle assembly, a second connecting pipe, a mixing pipe and an outlet pipe, wherein the ejection nozzle assembly is arranged on the first connecting pipe for spraying high-pressure gas, the second connecting pipe is arranged at the air outlet end of the first connecting pipe, the mixing pipe is arranged on the second connecting pipe for mixing and discharging high-pressure gas and oil mist-containing air, and the outlet pipe is arranged on the mixing pipe for connecting a filter.

[0006] As a preferred solution of the oil mist removal device for a centrifugal compressor described in the utility model, the injection nozzle assembly includes a nozzle, a nozzle, an air inlet and a fixed circular plate, the nozzle is arranged at the front end of the nozzle, the air inlet is arranged at the rear end of the nozzle, the fixed circular plate is arranged at one end of the nozzle close to the air inlet, and the fixed circular plate is arranged on the first connecting pipe.

[0007] As a preferred solution of the oil mist removal device for a centrifugal compressor described in the utility model, flanges are provided on the first connecting pipe, the second connecting pipe, the mixing pipe and the outlet pipe, and the first connecting pipe and the second connecting pipe, the second connecting pipe and the mixing pipe, and the mixing pipe and the outlet pipe are all connected by flanges to facilitate the interconnection of the first connecting pipe, the second connecting pipe, the mixing pipe and the outlet pipe.

[0008] As a preferred solution of the oil mist removal device for a centrifugal compressor described in the utility model, a first gasket is arranged between the first connecting pipe and the second connecting pipe to ensure the sealing between the first connecting pipe and the second connecting pipe, and a second gasket is arranged between the mixing pipe and the outlet pipe to ensure the sealing between the mixing pipe and the outlet pipe.

[0009] As a preferred solution of the oil mist removal device for a centrifugal compressor described in the utility model, the front half of the mixing tube is an equal-diameter mixing section to facilitate rapid mixing of the high-pressure airflow and the oil mist-containing air, and the rear half is a conical diffusion section to ensure that the mixed fluid can be discharged at a higher pressure, thereby completing the suction and transportation of the oil mist-containing air.

[0010] As a preferred solution of the oil mist removal device for a centrifugal compressor described in the utility model, the nozzle is a double-conical structure with a small middle and large ends, so that the high-pressure airflow can be ejected at a supersonic speed.

[0011] Beneficial effects:

[0012] 1. This device uses the Venturi effect to extract the oil mist in the oil tank, replacing the motor in the prior art to meet the application occasions with explosion-proof requirements, which not only improves the safety of the overall device, but also reduces the production cost;

[0013] 2. The overall structure of this device is simple, with high reliability, suitable for long-term continuous operation; no maintenance is required, saving maintenance costs;

[0014] 3. This device can make full use of the compressed air source provided by the compressor itself, save electricity, and achieve a certain energy-saving and environmental protection effect;

[0015] 4. This device eliminates the original motor, has no power components, and has low noise;

[0016] 5. This device has better versatility and can meet the requirements of both ordinary customers and customers with explosion-proof requirements;

[0017] 6. The design and production costs of this device are lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 It is a schematic diagram of the overall structure of an oil mist removal device for a centrifugal compressor.

[0020] Figure 2 A top view of an oil mist removal device for a centrifugal compressor.

[0021] Figure 3 Oil mist removal device for centrifugal compressor Figure 2 Cross-sectional view along the AA direction.

[0022] Figure 4 The schematic diagram of the structure of a mixing tube of an oil mist removal device for a centrifugal compressor.

[0023] Figure 5 The schematic diagram of the structure of the nozzle of the oil mist removal device for the centrifugal compressor.

[0024] In the figure: 1. first connecting pipe; 2. injection nozzle assembly; 21. nozzle; 22. nozzle; 23. air inlet; 24. fixed circular plate; 3. second connecting pipe; 4. mixing pipe; 5. outlet pipe; 6. flange; 7. first gasket; 8. second gasket. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example

[0029] Reference Figures 1 to 5 The present embodiment provides an oil mist removal device for a centrifugal compressor, comprising a first connecting pipe 1, an ejection nozzle assembly 2, a second connecting pipe 3, a mixing pipe 4 and an outlet pipe 5, wherein the ejection nozzle assembly 2 is arranged on the first connecting pipe 1 for ejecting high-pressure gas, the second connecting pipe 3 is arranged at the gas outlet end of the first connecting pipe 1, the mixing pipe 4 is arranged on the second connecting pipe 3 for mixing and discharging high-pressure gas and oil mist-containing air, and the outlet pipe 5 is arranged on the mixing pipe 4 for connecting a filter.

[0030] The first connecting pipe 1 is an "L"-shaped structure as a whole, serving as the installation base of the entire device and providing support for the entire device. Two air inlet ends are arranged on the left side of the first connecting pipe 1, and an air outlet end is arranged on the right side. An injection nozzle assembly 2 is installed at the air inlet end located on the upper left side of the first connecting pipe 1 to inject the external high-pressure airflow into the mixing tube 4. The air inlet end located on the lower left side of the first connecting pipe 1 can be directly connected to the oil tank (not shown in the figure) so as to suck the air containing oil mist in the oil tank into the mixing tube 4. In this embodiment, the first connecting pipe 1 and the oil tank are installed horizontally. In other embodiments, the first connecting pipe 1 and the oil tank can also be installed vertically. The air outlet end on the right side of the first connecting pipe 1 is connected to the inlet end of the second connecting pipe 3, and the inlet end of the mixing tube 4 is sleeved on the first In the second connecting pipe 3, the outlet end of the mixing pipe 4 is connected to the outlet end of the second connecting pipe 3, so that the high-pressure gas and the oil mist-containing air can be mixed and discharged in the mixing pipe 4, and the outlet end of the mixing pipe 4 is connected with the outlet pipe 5, that is, the mixing pipe 4 is connected to the filter (not shown in the figure) through the outlet pipe 5, so that the mixed fluid of the high-pressure gas and the oil mist-containing air is filtered by the filter, and the oil mist in the mixed air is filtered out and returned to the oil tank, and the filtered air is discharged into the atmosphere to achieve the effect of removing oil mist from the centrifugal compressor. The device eliminates the motor in the original method, so that it can meet the application occasions with explosion-proof requirements, improves the safety of the overall device, reduces the production cost, and also achieves no power components and low noise. The overall structure of the device is simple, the reliability is high, and it is suitable for long-term continuous operation.

[0031] Specifically, the injection nozzle assembly 2 includes a nozzle 21, a nozzle 22, an air inlet 23 and a fixed circular plate 24, the nozzle 22 is arranged at the front end of the nozzle 21, the air inlet 23 is arranged at the rear end of the nozzle 21, the fixed circular plate 24 is arranged at one end of the nozzle 21 close to the air inlet 23, and the fixed circular plate 24 is arranged on the first connecting pipe 1.

[0032] The ejection nozzle assembly 2 is mainly composed of a nozzle 21, a nozzle 22, an air inlet 23 and a fixed circular plate 24. The nozzle 22 is arranged at the front end of the nozzle 21. The front end of the nozzle 21 and the nozzle 22 are both located in the first connecting pipe 1. A cavity is formed between the nozzle 21 and the first connecting pipe 1, so as to suck the oil mist air in the oil tank into the cavity. The rear end of the nozzle 21 is provided with an air inlet 23. High-pressure gas enters the nozzle 21 through the air inlet 23. The air inlet 23 is located outside the first connecting pipe 1. A fixed circular plate 24 is fixedly installed at one end of the nozzle 21 close to the air inlet 23. The nozzle 21 is fixedly installed to the air inlet end of the upper left part of the first connecting pipe 1 through the fixed circular plate 24. The air inlet 23 can be directly connected to the compressor through a pipeline, that is, the high-pressure airflow generated by the compressor itself is directly transported to the nozzle 21 through the air inlet 23, and then ejected through the nozzle 22. The compressed air source provided by the compressor itself is utilized to save electric energy, thereby achieving a certain energy-saving and environmental protection effect.

[0033] Furthermore, flanges 6 are provided on the first connecting pipe 1 , the second connecting pipe 3 , the mixing pipe 4 and the outlet pipe 5 , and the first connecting pipe 1 and the second connecting pipe 3 , the second connecting pipe 3 and the mixing pipe 4 , and the mixing pipe 4 and the outlet pipe 5 are all connected via the flanges 6 .

[0034] In this embodiment, a flange 6 is installed at the air inlet end of the lower left side of the first connecting pipe 1 to facilitate direct connection with the oil tank through the flange 6, and flanges 6 are installed at the air outlet end on the right side of the first connecting pipe 1 and the inlet end of the second connecting pipe 3 to facilitate connection between the air outlet end of the first connecting pipe 1 and the inlet end of the second connecting pipe 3, and flanges 6 are installed at the outlet end of the mixing pipe 4 and the inlet end of the outlet pipe 5 to facilitate connection between the outlet end of the mixing pipe 4 and the outlet end of the second connecting pipe 3 and the inlet end of the outlet pipe 5, respectively.

[0035] Furthermore, a first gasket 7 is provided between the first connecting pipe 1 and the second connecting pipe 3 , and a second gasket 8 is provided between the mixing pipe 4 and the outlet pipe 5 .

[0036] In this embodiment, a first gasket 7 is installed between the flange 6 at the outlet end of the first connecting pipe 1 and the flange 6 at the inlet end of the second connecting pipe 3 to ensure the sealing between the first connecting pipe 1 and the second connecting pipe 3, and a second gasket 8 is installed between the flange 6 at the outlet end of the mixing pipe 4 and the flange 6 at the inlet end of the outlet pipe 5 to ensure the sealing between the mixing pipe 4 and the outlet pipe 5.

[0037] Furthermore, the front half of the mixing tube 4 is a mixing section with a constant diameter, and the rear half is a conical diffusion section.

[0038] In this embodiment, the front half of the mixing tube 4 is set to an equal-diameter circular tube structure to facilitate rapid mixing of the high-pressure airflow and the oil mist-containing air, and the rear half of the mixing tube 4 is set to a conical structure to ensure that the mixed fluid can be discharged at a higher pressure, thereby completing the suction and transportation of the oil mist-containing air.

[0039] Furthermore, the nozzle 22 has a double-conical structure that is small in the middle and large at both ends.

[0040] In this embodiment, the nozzle 22 is set to a double-conical structure with a small middle and large ends, so that the high-pressure airflow can be ejected at a supersonic speed. It should be noted that the nozzle 22 has a flexible structural design and can be replaced with nozzles 22 of different inner diameters according to various production needs for application in different work scenarios.

[0041] When in use, the compressed air source generated by the compressor itself is transported to the nozzle 21 through the air inlet 23, and the high-pressure gas flows from the nozzle 21 to the nozzle 22. After being further accelerated by the nozzle 22, it is sprayed to the mixing tube 4 at a supersonic speed. The speed of the high-pressure airflow is significantly increased, resulting in a significant decrease in its static pressure, forming a low-pressure area at the outlet of the nozzle 22, so that the mixing tube 4 can effectively inhale the air in the cavity between the nozzle 21 and the first connecting tube 1, until the oil mist air in the oil tank is sucked into the cavity between the nozzle 21 and the first connecting tube 1 through the air inlet end at the lower left side of the first connecting tube 1, and is sucked into the front half of the mixing tube 4, where the high-pressure airflow and the oil mist air meet and begin to mix. It should be noted that due to the high-speed flow of the high-pressure airflow, strong turbulence will be generated in the mixing section of the front half of the mixing tube 4, causing the two The two fluids are quickly mixed in a short distance, and the mixed fluid flows to the diffusion section of the rear half of the mixing tube 4. The conical structure of the diffusion section gradually reduces the speed of the fluid, converts kinetic energy into static pressure energy, and finally restores the pressure of the mixed fluid to a pressure level close to that of the high-pressure airflow, so as to ensure that the mixed fluid can be discharged at a higher pressure, thereby completing the suction and delivery of the oil mist-containing air. Then, the mixed fluid of the high-pressure gas and the oil mist-containing air is filtered through the filter, and the oil mist in the mixed air is filtered out and returned to the oil tank. The filtered air is discharged into the atmosphere to achieve the effect of removing oil mist from the centrifugal compressor. The device eliminates the motor in the original method, which not only enables it to meet the application occasions with explosion-proof requirements, but also realizes no power components and low noise. The overall structure of the device is simple, the reliability is high, and it is suitable for long-term continuous operation.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An oil mist removal device for a centrifugal compressor, characterized in that: The invention comprises a first connecting pipe (1), an ejection nozzle assembly (2), a second connecting pipe (3), a mixing pipe (4) and an outlet pipe (5); the ejection nozzle assembly (2) is arranged on the first connecting pipe (1) and is used for ejecting high-pressure gas; the second connecting pipe (3) is arranged at the gas outlet end of the first connecting pipe (1); the mixing pipe (4) is arranged on the second connecting pipe (3) and is used for mixing and discharging high-pressure gas and oil mist-containing air; and the outlet pipe (5) is arranged on the mixing pipe (4) and is used for connecting a filter.

2. The oil mist removal device for a centrifugal compressor according to claim 1, characterized in that: The injection nozzle assembly (2) comprises a nozzle (21), a nozzle (22), an air inlet (23) and a fixed circular plate (24); the nozzle (22) is arranged at the front end of the nozzle (21); the air inlet (23) is arranged at the rear end of the nozzle (21); the fixed circular plate (24) is arranged at one end of the nozzle (21) close to the air inlet (23); and the fixed circular plate (24) is arranged on the first connecting pipe (1).

3. The oil mist removal device for a centrifugal compressor according to claim 1, characterized in that: The first connecting pipe (1), the second connecting pipe (3), the mixing pipe (4) and the outlet pipe (5) are all provided with flanges (6); the first connecting pipe (1) and the second connecting pipe (3), the second connecting pipe (3) and the mixing pipe (4), and the mixing pipe (4) and the outlet pipe (5) are all connected via the flanges (6).

4. The oil mist removal device for a centrifugal compressor according to claim 3, characterized in that: A first gasket (7) is provided between the first connecting pipe (1) and the second connecting pipe (3), and a second gasket (8) is provided between the mixing pipe (4) and the outlet pipe (5).

5. The oil mist removal device for a centrifugal compressor according to claim 1, characterized in that: The front half of the mixing tube (4) is a mixing section with a constant diameter, and the rear half is a conical diffusion section.

6. The oil mist removal device for a centrifugal compressor according to claim 2, characterized in that: The nozzle (22) is in a double-conical structure with a small middle and large ends.

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