Dry gas seal structure for self-cleaning screw compressor

Abstract

The utility model discloses a kind of dry gas seal structure for self-cleaning screw compressor, including dry gas seal assembly, floating ring mechanism and main shaft, dry gas seal assembly is sleeved on the main shaft, floating ring mechanism is sleeved on the main shaft and located below dry gas seal assembly, floating ring mechanism and dry gas seal assembly are all arranged in compressor shell, and outer clean gas passage is provided on compressor shell, inner clean gas passage is provided on floating ring mechanism, outer clean gas passage is communicated with inner clean gas passage, and external clean gas continuously flows into and enters floating ring mechanism through outer clean gas passage, for avoiding that impurity in compressor enters dry gas seal assembly;In the utility model, floating ring mechanism is arranged below dry gas seal, clean gas is continuously filled into floating ring mechanism, gas isolation is carried out to the bottom of dry gas seal, to prevent that impurity in medium gas in compressor is attracted into dynamic ring or static ring of dry gas seal by negative pressure, reduce the abrasion of dry gas seal, thereby prolong service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of dry gas sealing components, specifically relating to a dry gas sealing structure for a self-cleaning screw compressor. Background Technology

[0002] During compressor operation, the process gas is under high pressure. Without proper sealing, gas leakage not only wastes energy but may also cause safety accidents. Dry gas seals effectively prevent process gas leakage to the outside, ensuring the safe operation of the compressor. They also have a positive impact on environmental protection. Traditional sealing methods may require large amounts of sealing oil, which generates waste oil during use. Improper disposal can pollute the environment. Dry gas seals can reduce the amount of sealing oil used, thereby reducing waste oil generation. However, existing dry gas seals lack a media-blocking structure at one end inside the compressor. Impurities from the compressor's internal media gradually enter the dynamic or static rings of the dry gas seal, leading to severe wear and a reduced service life. Utility Model Content

[0003] The purpose of this utility model is to provide a dry gas seal structure for a self-cleaning screw compressor. By setting a floating ring mechanism below the dry gas seal, and continuously filling the floating ring mechanism with clean gas, the bottom of the dry gas seal is isolated from the gas, preventing impurities in the medium gas inside the compressor from being attracted into the moving or stationary ring of the dry gas seal by negative pressure, thereby reducing the wear of the dry gas seal.

[0004] This utility model is achieved through the following technical solution:

[0005] A dry gas sealing structure for a self-cleaning screw compressor includes a dry gas sealing assembly, a floating ring mechanism, and a main shaft. The dry gas sealing assembly is sleeved on the main shaft, and the floating ring mechanism is sleeved on the main shaft and located below the dry gas sealing assembly. Both the floating ring mechanism and the dry gas sealing assembly are disposed inside the compressor housing. The compressor housing is provided with an external clean gas channel, and the floating ring mechanism is provided with an internal clean gas channel. The external clean gas channel and the internal clean gas channel are connected, and external clean gas continuously flows in through the external clean gas channel and enters the floating ring mechanism to prevent impurities inside the compressor from entering the dry gas sealing assembly.

[0006] Preferably, the floating ring mechanism includes a clamping sleeve, a limiting cap, a ring seat, and two sets of floating ring assemblies. The clamping sleeve is connected to the dry gas sealing assembly. The ring seat is disposed on the outside of the clamping sleeve and is also connected to the dry gas sealing assembly. The limiting cap is located at the end of the clamping sleeve and the ring seat. Both sets of floating ring assemblies are disposed between the limiting cap and the ring seat. A spacer ring is disposed between the floating ring assemblies. The floating ring assembly on the left side of the spacer ring is limited by the limiting cap, and the floating ring assembly on the right side of the spacer ring is limited by the spacer ring.

[0007] Preferably, a wear-resistant layer is provided on the surface of the clamping sleeve at the location of the floating ring assembly.

[0008] Preferably, the internal air purification channel is disposed on the ring seat and communicates with the floating ring assembly.

[0009] Preferably, the floating ring assembly includes a split carbon ring, a pull ring, and a limiting pin. The outer surface of the split carbon ring is provided with a ring groove, and the pull ring is disposed in the ring groove and limits the split carbon ring. The limiting pin is disposed on the split carbon ring, and both the limiting cap and the spacer ring are provided with limiting grooves. The limiting pin cooperates with the limiting grooves and slides up and down in the limiting grooves.

[0010] Preferably, the inner surface of the split carbon ring is provided with an air groove, which facilitates the separation of the carbon petals from the clamping sleeve.

[0011] Preferably, the dry gas sealing assembly includes a rotating ring, a stationary ring group, a friction pair group, a housing assembly, and a fixing member. The rotating ring is sleeved on the main shaft. A friction pair and a stationary ring are provided on both the left and right sides of the rotating ring. The housing assembly is located outside the stationary ring group and the friction pair group. The fixing member is connected to the rotating ring and is located at the end away from the limiting cover.

[0012] Preferably, the fastener is disposed between the outer housing and the main shaft.

[0013] Preferably, the housing assembly includes an inner housing and an outer housing, the ring seat is connected to the inner housing, and the clamping sleeve is connected to the moving ring.

[0014] Preferably, the outer casing is provided with an inner sealing gas passage, and the compressor housing is provided with an outer sealing gas passage, the outer sealing gas passage being connected to the inner sealing gas passage.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] 1) In this utility model, by setting a floating ring mechanism below the dry gas seal, and continuously filling the floating ring mechanism with clean gas, the bottom of the dry gas seal is isolated from the gas, preventing impurities in the medium gas inside the compressor from being attracted into the moving or stationary ring of the dry gas seal by negative pressure, reducing the wear of the dry gas seal, and thus extending its service life.

[0017] 2) In this utility model, the floating ring mechanism is provided with two floating ring assemblies, which are spaced apart. The split carbon ring in the floating ring assembly includes three fan-shaped carbon petals. Each carbon petal is provided with an annular groove. A pull ring is provided in the annular groove. The pull ring circumferentially limits the carbon petal to prevent the three carbon petals from separating. At the same time, the carbon petals can open and close under the action of clean gas. The clean gas forms a gas combination layer between the carbon petal and the compression sleeve to prevent impurities in the compressor from entering the dry gas seal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram of the dry gas sealing structure for the self-cleaning screw compressor in this utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0021] The components are: 1-floating ring mechanism, 11-compression sleeve, 111-wear-resistant layer, 12-ring seat, 121-inner clean air passage, 13-limiting cover, 131-limiting groove, 14-spacer ring, 15-split carbon ring, 151-air groove, 16-pull ring, 17-limiting pin, 2-compressor housing, 21-outer clean air passage, 22-sealing air external passage, 3-dry air sealing assembly, 31-inner housing, 32-outer housing, 321-sealing air internal passage, 33-moving ring, 34-friction pair, 35-stationary ring, 4-fixed component, 5-main shaft. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] Example 1:

[0024] A dry gas seal structure for a self-cleaning screw compressor, such as Figure 1 and Figure 2As shown, the system includes a dry gas sealing assembly 3, a floating ring mechanism 1, and a main shaft 5. The dry gas sealing assembly 3 is sleeved on the main shaft 5, and the floating ring mechanism 1 is sleeved on the main shaft 5 and located below the dry gas sealing assembly 3. Both the floating ring mechanism 1 and the dry gas sealing assembly 3 are located inside the compressor housing 2. The compressor housing 2 has a stepped structure at its port, with a smaller diameter at the bottom and a larger diameter at the top. The floating ring mechanism 1 is located at the lower, smaller diameter position inside the compressor housing 2, and the dry gas sealing assembly 3 is located at the transition position of the stepped structure. An external clean gas channel 21 is provided on the compressor housing 2, and an internal clean gas channel 121 is provided on the floating ring mechanism 1. The external clean gas channel 21 and the internal clean gas channel 121 are connected. External clean gas continuously flows into the floating ring mechanism 1 through the external clean gas channel 21 to prevent impurities in the compressor from entering the dry gas sealing assembly 3. The clean gas forms a gas diaphragm in the floating ring mechanism 1, preventing impurities in the medium inside the compressor from entering the dry gas sealing assembly 3 and causing wear to the dry gas sealing assembly 3.

[0025] The floating ring mechanism 1 includes a clamping sleeve 11, a limiting cover 13, a ring seat 12, and two sets of floating ring assemblies. The clamping sleeve 11 is connected to the dry gas sealing assembly 3. One end of the clamping sleeve 11 is spaced apart from the main shaft 5, and the other end abuts against the dry gas sealing assembly 3 and the main shaft 5, and is connected to the dry gas sealing assembly 3 by bolts. The ring seat 12 is located outside the clamping sleeve 11 and is also connected to the dry gas sealing assembly 3. The limiting cover 13 is located at the end of the clamping sleeve 11 and the ring seat 12. Both sets of floating ring assemblies are located between the limiting cover 13 and the ring seat 12. The inner clean air channel 121 is located on the right side of the two sets of floating ring assemblies. The inner clean air channel 121 is located on the ring seat 12 and communicates with the floating ring assemblies. A spacer 14 is provided between the floating ring assemblies. The spacer 14 separates the two sets of floating ring assemblies. The floating ring assembly on the left side of the spacer 14 is limited by the limiting cover 13, and the floating ring assembly on the right side of the spacer 14 is limited by the spacer 14. A bolt is provided on the limiting cover 13. The bolt passes through the limiting cover 13 and the spacer 14 and is connected to the ring seat 12. A wear-resistant layer 111 is provided on the surface of the clamping sleeve 11 at the position of the floating ring assembly. The wear-resistant layer 111 is made by spraying hard alloy to prevent the clamping sleeve 11 from being worn by the floating ring assembly due to the rotation of the clamping sleeve 11 by the spindle 5.

[0026] The floating ring assembly includes a split carbon ring 15, a pull ring 16, and a limiting pin 17. The split carbon ring 15 includes three fan-shaped carbon segments, each with a groove. An annular groove is formed on the outer surface of the split carbon ring 15 composed of the three carbon segments. The pull ring 16 is placed in the annular groove and limits the split carbon ring 15 to prevent the three carbon segments from completely separating. The limiting pin 17 is placed on the split carbon ring 15 and protrudes from the side of one of the carbon segments. The limiting cover 13 and the spacer ring 14 are both provided with limiting grooves 131. The limiting pin 17 is inserted into the limiting groove 131 and slides up and down in the limiting groove 131. When the clamping sleeve 11 rotates, there is a gas diaphragm gap between the bottom of the carbon segment and the clamping sleeve 11. Through the cooperation of the limiting groove 131 and the limiting pin 17, the three carbon segments do not deviate during expansion and movement, and do not rotate with the clamping sleeve 11. The inner surface of the split carbon ring 15 is provided with an air groove 151. The air groove 151 facilitates the separation of the carbon petal from the clamping sleeve 11. When clean air enters the bottom of the carbon petal from the gap between the carbon petals and the gap between the carbon petal and the clamping sleeve 11, the clean air will accumulate at the air groove 151, which makes it easier for the clean air to lift the carbon petal and create a gas diaphragm between the carbon petal and the clamping sleeve 11.

[0027] Example 2:

[0028] This embodiment, based on the above embodiment, further defines the dry gas sealing assembly 3, such as... Figure 1 As shown, the dry gas sealing assembly 3 includes a rotating ring 33, a set of stationary rings 35, a set of friction pairs 34, a housing assembly, and a fixing member 4. The rotating ring 33 is sleeved on the main shaft 5. An isolation part is provided in the middle of the rotating ring 33. A friction pair 34 and a stationary ring 35 are provided on both the left and right sides of the isolation part of the rotating ring 33. The housing assembly is located outside the set of stationary rings 35 and the set of friction pairs 34, and the housing assembly covers the set of stationary rings 35, the rotating ring 33, and the set of friction pairs 34. The fixing member 4 is connected to the rotating ring 33 and is located at the end away from the limiting cover 13. The fixing member 4 is located between the outer housing 32 and the main shaft 5. The compressor is connected to the external bearing housing. The main shaft 5 extends into the compressor from the fixing part of the bearing housing. The outer end of the fixing member 4 abuts against the fixing part of the bearing housing, thereby limiting the rotating ring 33. The housing assembly includes an inner housing 31 and an outer housing 32. The ring seat 12 is bolted to the inner housing 31. A clamping sleeve 11 is inserted between the inner housing 31 and the rotating ring 33 and bolted to the rotating ring 33. An inner sealing gas passage 321 is provided on the outer housing 32, and an outer sealing gas passage 22 is provided on the compressor housing 2. Sealing gas from the external gas supply device enters through the outer sealing gas passage 22 and passes through the inner sealing gas passage 321 to the stationary ring 35 group and the rotating ring 33 position. After the rotating ring 33 rotates, a gas sealing film is formed within the dry gas seal. Other parts of this embodiment are the same as those in the above embodiments and will not be repeated here.

[0029] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A dry gas sealing structure for a self-cleaning screw compressor, characterized in that, The system includes a dry gas sealing assembly, a floating ring mechanism, and a main shaft. The dry gas sealing assembly is sleeved on the main shaft, and the floating ring mechanism is sleeved on the main shaft and located below the dry gas sealing assembly. Both the floating ring mechanism and the dry gas sealing assembly are disposed inside the compressor housing. The compressor housing is provided with an external clean gas channel, and the floating ring mechanism is provided with an internal clean gas channel. The external clean gas channel and the internal clean gas channel are connected, and external clean gas continuously flows in through the external clean gas channel and enters the floating ring mechanism to prevent impurities inside the compressor from entering the dry gas sealing assembly.

2. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 1, characterized in that, The floating ring mechanism includes a clamping sleeve, a limiting cap, a ring seat, and two sets of floating ring assemblies. The clamping sleeve is connected to the dry gas sealing assembly. The ring seat is located on the outside of the clamping sleeve and is also connected to the dry gas sealing assembly. The limiting cap is located at the end of the clamping sleeve and the ring seat. Both sets of floating ring assemblies are located between the limiting cap and the ring seat. A spacer ring is provided between the floating ring assemblies. The floating ring assembly on the left side of the spacer ring is limited by the limiting cap, and the floating ring assembly on the right side of the spacer ring is limited by the spacer ring.

3. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 2, characterized in that, The surface of the clamping sleeve is provided with a wear-resistant layer at the location of the floating ring assembly.

4. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 2, characterized in that, The internal air purification channel is located on the ring seat and communicates with the floating ring assembly.

5. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 2, characterized in that, The floating ring assembly includes a split carbon ring, a pull ring, and a limiting pin. The outer surface of the split carbon ring is provided with a ring groove, and the pull ring is disposed in the ring groove and limits the split carbon ring. The limiting pin is disposed on the split carbon ring, and both the limiting cap and the spacer ring are provided with limiting grooves. The limiting pin cooperates with the limiting grooves and slides up and down in the limiting grooves.

6. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 5, characterized in that, The inner surface of the split carbon ring is provided with an air groove, which facilitates the separation of the carbon petals from the clamping sleeve.

7. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 2, characterized in that, The dry gas sealing assembly includes a rotating ring, a stationary ring group, a friction pair group, a housing assembly, and a fixing member. The rotating ring is sleeved on the main shaft. A friction pair and a stationary ring are provided on both the left and right sides of the rotating ring. The housing assembly is located outside the stationary ring group and the friction pair group. The fixing member is connected to the rotating ring and is located at the end away from the limiting cover.

8. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 7, characterized in that, The fastener is located between the outer housing and the main shaft.

9. The dry gas sealing structure for a self-cleaning screw compressor as described in claim 7, characterized in that, The housing assembly includes an inner housing and an outer housing, the ring seat is connected to the inner housing, and the clamping sleeve is connected to the moving ring.

10. The dry gas seal structure for a self-cleaning screw compressor as described in claim 9, characterized in that, The outer casing is provided with an inner sealing gas passage, and the compressor housing is provided with an outer sealing gas passage, which is connected to the inner sealing gas passage.

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