A sealing mechanism for an ethanol compressor

Abstract

This utility model discloses a sealing mechanism for an ethanol compressor, including a gas seal connecting plate, a gas seal body, carbon rings, and a main shaft. The carbon rings include a first-stage carbon ring, a second-stage carbon ring, a third-stage carbon ring, a fourth-stage carbon ring, and a fifth-stage carbon ring arranged sequentially. The first-stage carbon ring corresponds to the ethanol vapor side, and the fifth-stage carbon ring corresponds to the atmospheric side. A primary sealing cavity is formed between the first-stage and second-stage carbon rings, a secondary sealing cavity is formed between the second-stage and third-stage carbon rings, a tertiary sealing cavity is formed between the third-stage and fourth-stage carbon rings, and a quaternary sealing cavity is formed between the fourth-stage and fifth-stage carbon rings. A sealing gas inlet and an isolation gas inlet are provided on the outer circumferential surface of the gas seal body. The sealing gas inlet connects to the secondary sealing cavity, and the isolation gas inlet connects to the quaternary sealing cavity. This utility model adopts a combined sealing mechanism of sealing gas and isolation gas to achieve a sealing effect with almost zero leakage.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a sealing mechanism for an ethanol compressor. Background Technology

[0002] The compressor can handle media such as air, water vapor, and ethanol. When the media is air or water vapor, a sealing gas is typically used to seal the compressor. However, when the media is ethanol, for system safety reasons, near-zero leakage is required, and a sealing gas alone is insufficient to achieve the desired seal. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing mechanism for an ethanol compressor, which adopts a combination of sealing gas and isolation gas to achieve a sealing effect with almost zero leakage.

[0004] The purpose of this utility model is achieved as follows:

[0005] A sealing mechanism for an ethanol compressor includes a gas seal connecting plate, a gas seal body, a carbon ring, and a main shaft. The gas seal body is fixed on the gas seal connecting plate and is sleeved on the main shaft. The carbon ring is nested inside the gas seal body, forming a seal between the carbon ring and the main shaft. The carbon ring includes a first-stage carbon ring, a second-stage carbon ring, a third-stage carbon ring, a fourth-stage carbon ring, and a fifth-stage carbon ring arranged sequentially. The first-stage carbon ring corresponds to the ethanol vapor side, and the fifth-stage carbon ring corresponds to the atmospheric side. A primary sealing cavity is formed between the first-stage and second-stage carbon rings, a secondary sealing cavity is formed between the second-stage and third-stage carbon rings, a tertiary sealing cavity is formed between the third-stage and fourth-stage carbon rings, and a quaternary sealing cavity is formed between the fourth-stage and fifth-stage carbon rings.

[0006] The outer circumferential surface of the gas seal body is provided with a sealing gas inlet and an isolation gas inlet. The sealing gas inlet is connected to the secondary sealing cavity and is used to input sealing gas into the secondary sealing cavity. The isolation gas inlet is connected to the quaternary sealing cavity and is used to input isolation gas into the quaternary sealing cavity. The pressure of the sealing gas is greater than the pressure on the ethanol vapor side, and the pressure of the isolation gas is greater than the pressure on the atmospheric side.

[0007] Preferably, the sealing gas inlet is connected to a sealing gas pipeline, the isolation gas inlet is connected to an isolation gas pipeline, and pressure sensors are installed in both the sealing gas pipeline and the isolation gas pipeline.

[0008] Preferably, the pressure in the sealing gas pipeline is 10-20 kPa higher than the pressure in the secondary sealing chamber, and the pressure in the isolation gas pipeline is 10-20 kPa higher than the pressure in the quaternary sealing chamber.

[0009] Preferably, an annular groove is provided at the third-level sealing cavity, and the annular groove is used to contain the isolation gas.

[0010] Preferably, the sealing gas is saturated water vapor, and the isolation gas is an inert gas.

[0011] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:

[0012] 1. Based on the carbon ring sealing method, only one isolation gas line is added after the sealing gas line, which is simple in structure;

[0013] 2. The sealing gas and the isolation gas act as a barrier to each other. The isolation gas will not enter the ethanol vapor side, and the sealing gas will not enter the atmosphere side, effectively improving the system's sealing performance and thermal efficiency.

[0014] 3. Add pressure detection and interlock protection for automatic control. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the airtight inlet of this utility model;

[0016] Figure 2 This is a cross-sectional view of the air inlet of the present invention.

[0017] Figure Labels

[0018] In the attached diagram, 1-gas seal connecting plate, 2-gas seal body, 3-main shaft, 4-first-stage carbon ring, 5-second-stage carbon ring, 6-third-stage carbon ring, 7-fourth-stage carbon ring, 8-fifth-stage carbon ring, 9-sealing gas inlet, and 10-isolation gas inlet. Detailed Implementation

[0019] See Figure 1 , Figure 2 A sealing mechanism for an ethanol compressor includes a gas seal connecting plate 1, a gas seal body 2, carbon rings, and a main shaft 3. The gas seal body 2 is fixed on the gas seal connecting plate 1 and is sleeved on the main shaft 3. The carbon rings are nested inside the gas seal body, forming a seal between the carbon rings and the main shaft 3. The carbon rings include a first-stage carbon ring 4, a second-stage carbon ring 5, a third-stage carbon ring 6, a fourth-stage carbon ring 7, and a fifth-stage carbon ring 8 arranged sequentially. The first-stage carbon ring 4 corresponds to the ethanol vapor side, and the fifth-stage carbon ring 8 corresponds to the atmospheric side. A first-stage sealing cavity is formed between the first-stage carbon ring 4 and the second-stage carbon ring 5 (composed of the cavity between the gas seal body 2, the main shaft 3, the first-stage carbon ring 4, and the second-stage carbon ring 5). A second-stage sealing cavity is formed between the second-stage carbon ring 5 and the third-stage carbon ring 6. A third-stage sealing cavity is formed between the third-stage carbon ring 6 and the fourth-stage carbon ring 7 (the third-stage sealing cavity is connected to the discharge port, i.e., the atmospheric side, so that subsequent sealing gas can leak out). The fourth-stage carbon ring 7 and the fifth-stage carbon ring 8 form a fourth-stage sealing cavity.

[0020] The outer circumferential surface of the gas seal body 2 is provided with a sealing gas inlet 9 and an isolation gas inlet 10. The sealing gas inlet is connected to the secondary sealing cavity and is used to input sealing gas into the secondary sealing cavity. The isolation gas inlet is connected to the quaternary sealing cavity and is used to input isolation gas into the quaternary sealing cavity. The pressure of the sealing gas is greater than the pressure on the ethanol vapor side, and the pressure of the isolation gas is greater than the pressure on the atmospheric side.

[0021] The sealing gas inlet 9 is connected to the sealing gas pipeline, and the isolation gas inlet 10 is connected to the isolation gas pipeline. Pressure sensors are installed in both the sealing gas pipeline and the isolation gas pipeline.

[0022] The pressure in the sealed gas pipeline is 10-20 kPa higher than the pressure in the secondary sealed cavity, and the pressure in the isolation gas pipeline is 10-20 kPa higher than the pressure in the quaternary sealed cavity.

[0023] An annular groove is provided at the third-stage sealing cavity to hold the isolation gas, preventing the sealing gas from leaking into the third-stage sealing cavity.

[0024] The sealing gas is saturated water vapor, and the isolation gas is an inert gas.

[0025] Specifically:

[0026] The gas seal body 2 is fixed on the gas seal connecting plate 1. The outer peripheral surface of the gas seal body is provided with a sealing gas inlet and an isolation gas inlet. Five sets of carbon rings are nested inside the gas seal body. The sealing gas inlet connects to the secondary sealing cavity (from left to right, the first-level carbon ring and the second-level carbon ring form the primary sealing cavity, the second-level carbon ring and the third-level carbon ring form the secondary sealing cavity, and so on). The isolation gas inlet connects to the quaternary sealing cavity. The main shaft is a rotating component.

[0027] Pressure sensors are installed in both the sealing gas pipeline and the isolation gas pipeline. The sealing chamber pressure is calculated by software. The sealing gas pressure and the isolation gas pressure are interlocked and protected based on the sealing chamber pressure. The sealing gas pipeline pressure is 10~20 kPa higher than the ethanol vapor pressure of the secondary sealing chamber, and the isolation gas pipeline pressure is 10~20 kPa higher than the pressure of the quaternary sealing chamber.

[0028] The sealing gas inlet is connected to a saturated water vapor or other sealing gas, while the isolation gas inlet is connected to an inert isolation gas such as nitrogen. As the main shaft rotates, ethanol vapor enters the front end of the sealing mechanism from the gas seal connection plate 1. Under the action of the first and second-stage carbon rings, the pressure gradually decreases, and it is effectively blocked by the higher-pressure sealing gas between the second and third-stage sealing chambers. A small amount of ethanol vapor and some of the sealing gas enter the subsequent sealing chamber, where they are depressurized and effectively isolated by the higher-pressure isolation gas.

[0029] Pressure sensors are installed in both the sealing gas pipeline and the isolation gas pipeline. The sealing chamber pressure is calculated by software, and the sealing gas pressure and isolation gas pressure are interlocked for protection based on the sealing chamber pressure. The sealing gas pipeline pressure is 10-20 kPa higher than the secondary sealing chamber pressure, and the isolation gas pipeline pressure is 10-20 kPa higher than the quaternary sealing chamber pressure. To ensure safety, if the pressure does not meet this requirement, the compressor will be interlocked and shut down.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A sealing mechanism for an ethanol compressor, comprising a gas seal connecting plate, a gas seal body, a carbon ring, and a main shaft, wherein the gas seal body is fixed to the gas seal connecting plate and sleeved on the main shaft, and the carbon ring is nested inside the gas seal body, forming a seal between the carbon ring and the main shaft, characterized in that: The carbon ring includes a first-stage carbon ring, a second-stage carbon ring, a third-stage carbon ring, a fourth-stage carbon ring, and a fifth-stage carbon ring arranged sequentially. The first-stage carbon ring corresponds to the ethanol vapor side, and the fifth-stage carbon ring corresponds to the atmospheric side. A first-stage sealed cavity is formed between the first-stage carbon ring and the second-stage carbon ring, a second-stage sealed cavity is formed between the second-stage carbon ring and the third-stage carbon ring, a third-stage sealed cavity is formed between the third-stage carbon ring and the fourth-stage carbon ring, and a fourth-stage sealed cavity is formed between the fourth-stage carbon ring and the fifth-stage carbon ring. The outer circumferential surface of the gas seal body is provided with a sealing gas inlet and an isolation gas inlet. The sealing gas inlet is connected to the secondary sealing cavity and is used to input sealing gas into the secondary sealing cavity. The isolation gas inlet is connected to the quaternary sealing cavity and is used to input isolation gas into the quaternary sealing cavity. The pressure of the sealing gas is greater than the pressure on the ethanol vapor side, and the pressure of the isolation gas is greater than the atmospheric pressure.

2. A sealing mechanism for an ethanol compressor as defined in claim 1, wherein: The sealing gas inlet is connected to the sealing gas pipeline, and the isolation gas inlet is connected to the isolation gas pipeline. Pressure sensors are installed in both the sealing gas pipeline and the isolation gas pipeline.

3. A sealing mechanism for an ethanol compressor as defined in claim 2, wherein: The pressure in the sealed gas pipeline is 10-20 kPa higher than the pressure in the secondary sealed cavity, and the pressure in the isolation gas pipeline is 10-20 kPa higher than the pressure in the quaternary sealed cavity.

4. A sealing mechanism for an ethanol compressor as defined in claim 1, wherein: An annular groove is provided at the third-level sealing cavity, and the annular groove is used to contain the isolation gas.

5. A sealing mechanism for an ethanol compressor as defined in claim 1, wherein: The sealing gas is saturated water vapor, and the isolation gas is an inert gas.

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