Air floatation lip seal structure of compressor

Abstract

The utility model discloses an air floatation lip seal structure of a compressor, which comprises a first lip seal and a second lip seal, and the first lip seal and the second lip seal are sleeved at the extending end of a screw rotor main shaft of the compressor and are positioned in a sealing cavity between the extending end of the screw rotor main shaft and a machine head shell; an air floating ring is arranged between the first lip seal and the second lip seal, and the air floating ring is arranged on the screw rotor main shaft in a sleeving manner; the air floating ring is provided with a vent hole which penetrates through the air floating ring and extends in the radial direction; the shell is provided with a ventilation pipeline, and the first end of the ventilation pipeline communicates with the ventilation hole; the second end of the ventilation pipeline is communicated with a compressed air source. The utility model has the advantages that the air floating ring is arranged between the first lip seal and the second lip seal, and the air floating ring is used for ventilating the lip edges of the first lip seal and the second lip seal, which are attached to the compressor screw rotor main shaft, so that the first lip seal and the second lip seal are suspended on the surface of the compressor screw rotor main shaft, and the abrasion of the lip seals can be reduced while the sealing performance is ensured; the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to an air-floating lip seal structure of a compressor. Background Art

[0002] In the industrial field, sealing technology is crucial to the proper operation of mechanical equipment. Lip seals, as a common sealing element, are widely used in hydraulic, pneumatic, and lubrication systems. However, traditional lip seals, due to constant contact and wear with rotating shafts, can lead to unstable sealing performance and a short service life. Utility Model Content

[0003] In order to solve at least one of the above technical problems, the utility model provides an air-floating lip seal structure for a compressor, wherein an air-floating ring is arranged between a first lip seal and a second lip seal, and air is ventilated to the first lip seal and the second lip seal through the air-floating ring, so that the first lip seal and the second lip seal are suspended on the surface of the main shaft of the compressor screw rotor, thereby reducing the wear of the lip seals and increasing their service life.

[0004] The utility model solves the technical problem by adopting the following technical solutions:

[0005] A floating lip seal structure for a screw compressor includes a first lip seal and a second lip seal, wherein the first lip seal and the second lip seal are arranged on the protruding end of the compressor screw rotor main shaft and are located in a sealed cavity between the protruding end of the screw rotor main shaft and the head housing; an air floating ring is arranged between the first lip seal and the second lip seal, and the air floating ring is arranged on the screw rotor main shaft; the air floating ring is provided with an air vent that passes through the air floating ring and extends radially; the housing is provided with a ventilation pipe, the first end of the ventilation pipe is connected to the ventilation hole; the second end of the ventilation pipe is used to connect to a compressed air source.

[0006] Furthermore, the upper end surface of the air floating ring is attached to the lower end surface of the first lip seal, and the lower end surface of the air floating ring is attached to the upper end surface of the second lip seal, thereby limiting the axial position of the air floating ring, the first lip seal and the second lip seal.

[0007] Furthermore, there is a gap between the inner wall of the air flotation ring and the main shaft of the screw rotor, which facilitates the compressed air to flow to the first lip seal and the second lip seal.

[0008] Furthermore, the air flotation ring is provided with a plurality of evenly distributed vent holes along its circumference, so as to facilitate the compressed air to flow evenly and quickly into the gap between the air flotation ring and the main shaft of the screw rotor.

[0009] Furthermore, the air flotation ring includes an I-shaped air flotation ring, which facilitates the compressed air to flow into the gap between the air flotation ring and the main shaft of the screw rotor.

[0010] Furthermore, a shaft sleeve is provided on the protruding end of the screw rotor main shaft located in the sealing cavity, and the first lip seal, the second lip seal and the air flotation ring are provided on the shaft sleeve.

[0011] Furthermore, the second end of the ventilation pipe is connected to the air container of the gas-liquid separation barrel of the compressor through the air delivery pipe, and the compressor itself can be used to supply air, which is convenient for air supply.

[0012] Furthermore, a pressure regulating valve is provided on the gas pipeline to facilitate adjustment of the gas supply pressure.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The air-floating lip seal structure of the compressor has an air-floating ring arranged between the first lip seal and the second lip seal. Air is ventilated to the lips of the first and second lip seals that are in contact with the compressor screw rotor main shaft through the air-floating ring, so that the first and second lip seals are suspended on the surface of the compressor screw rotor main shaft. While ensuring sealing performance, the wear of the lip seals can be reduced and their service life can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and do not limit the scope of the present invention in any way, and that the components in the drawings are not drawn to scale.

[0016] Figure 1 This is a schematic diagram of the air-floating lip seal structure of the compressor of the utility model.

[0017] Figure 2 This is a schematic diagram of the sealing chamber structure of the compressor of the utility model.

[0018] Figure 3 This is a structural diagram of the air flotation ring of the utility model.

[0019] Figure 4 This is a schematic structural diagram of the AA cross-section of the utility model air flotation ring.

[0020] Figure 5 This is a schematic diagram of the air supply structure of the air-floating lip seal structure of the compressor of the utility model.

[0021] In the figure: 100-head; 101-first lip seal; 102-second lip seal; 103-screw rotor main shaft; 104-air flotation ring; 1041-vent; 1042-inner wall; 1043-outer wall; 1044-groove; 105-housing; 1051-step; 106-ventilation pipe; 107-sleeve; 200-gas pipe; 300-gas-liquid separation barrel; 400-pressure regulating valve; 500-motor rotor. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0023] In the description of this utility model, it should be noted that the term "including" and its variations represent an open-ended inclusion, i.e., "including but not limited to." The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0024] The utility model provides a compressor air-floating lip seal structure, referring to Figures 1-4 As shown, it includes a first lip seal 101 and a second lip seal 102, which are sleeved on the protruding end of the compressor screw rotor main shaft 103 and are located in a sealed cavity between the protruding end of the screw rotor main shaft 103 and the shell 105 of the head 100; an air flotation ring 104 is provided between the first lip seal 101 and the second lip seal 102, and the air flotation ring 104 is sleeved on the screw rotor main shaft 103; the air flotation ring 104 is provided with an air vent 1041 that passes through the air flotation ring 104 and extends radially; the shell 105 is provided with a ventilation pipe 106, the first end of the ventilation pipe 106 is connected to the ventilation hole 1041; the second end of the ventilation pipe 106 is used to connect to a compressed air source.

[0025] The compressor's screw rotor main shaft 103 extends out of the compressor housing 105 of the compressor head 100 and connects to the motor rotor 500. A sealed cavity is formed between the extended end of the screw rotor main shaft 103 and the housing 105 of the head 100, which is sealed by a first lip seal 101 and a second lip seal 102. An air ring 104 is positioned between the first and second lip seals 101, 102, separating the lower end of the first lip seal 101 from the upper end of the second lip seal 102, thereby forming a ventilation cavity between the first and second lip seals 101, 102. A ventilation duct 106 is provided in the housing 105 and directly communicates with the ventilation cavity, eliminating the need for a separate pipeline within the head 100 and simplifying the piping structure.

[0026] Pressurized gas enters the ventilation cavity formed between the first lip seal 101 and the second lip seal 102 through the ventilation duct 106, and then enters the center of the air ring 104 through the ventilation hole 1041. The center of the air ring 104 is connected to the lips of the first and second lip seals 101 and 102 that contact the screw rotor main shaft 103. As the screw rotor main shaft 103 rotates, the pressurized gas flows from the center of the air ring 104 toward the lips, squeezing them because the lips of the lip seals are relatively soft, separating the lips from the screw rotor main shaft 103. This creates a gap between the lip seals and the screw rotor main shaft 103, allowing the first and second lip seals 101 and 102 to float on the surface of the screw rotor main shaft 103, avoiding contact with the screw rotor main shaft 103 and reducing wear. The lip seal is provided with a rubber sealing ring, which still maintains sealing. Therefore, an air flotation ring 104 is provided between the first lip seal 101 and the second lip seal 102 to ensure sealing while reducing the wear of the lip seal and increasing its service life.

[0027] The upper end surface of the first lip seal 101 and the lower end surface of the second lip seal 102 are constrained by the step 1051 of the shell 105. Preferably, the upper end surface of the air floating ring 104 is affixed to the lower end surface of the first lip seal 101, and the lower end surface of the air floating ring 104 is affixed to the upper end surface of the second lip seal 102. This can form a constrained position limiter in the axial direction for the air floating ring 104, the first lip seal 101 and the second lip seal 102, thereby preventing the air floating ring 104, the first lip seal 101 and the second lip seal 102 from moving up and down in the axial direction.

[0028] In one embodiment, a gap is defined between the inner wall 1042 of the air flotation ring 104 and the screw rotor main shaft 103. The outer wall 1043 of the air flotation ring 104 is limited by the housing 105. The air flotation ring 104 may be a metal ring having a radial vent 1041. The first lip seal 101 and the second lip seal 102 press the air flotation ring 104, thereby limiting the axial position of the air flotation ring 104 and constraining the air flotation ring 104 in the radial direction, preventing radial movement. In this way, after compressed air flows toward the screw rotor main shaft 103 through the vent 1041, it can flow smoothly along the screw rotor main shaft 103 through the gap between the inner wall 1042 of the air flotation ring 104 and the screw rotor main shaft 103 to the lips of the first lip seal 101 and the second lip seal 102.

[0029] In one embodiment, reference Figure 3 and Figure 4 As shown, the air ring 104 is provided with a plurality of evenly distributed vent holes 1041 along its circumference. After compressed air enters the vent cavity, it flows evenly and quickly through each vent hole 1041 into the gap between the air ring 104 and the screw rotor main shaft 103, pushing the first and second lip seals 101, 102 away from the screw rotor main shaft 103. Preferably, the air ring 104 comprises an I-shaped air ring 104, i.e., an annular groove 1044 is provided in the middle of the outer wall 1043 of the air ring 104. The two end faces of the air flotation ring 104 can be radially positioned when the air flotation ring 104 is assembled. During assembly, the outer edges of the two end faces of the air flotation ring 104 can be fitted against the shell 105 of the machine head 100. The annular groove 1044 between the two end faces of the air flotation ring 104 can still form an annular ventilation cavity, which facilitates the compressed air to flow into the ventilation cavity from the ventilation pipe 106. At the same time, the compressed air can flow evenly and quickly from the annular ventilation cavity in the circumferential direction into the gap between the air flotation ring 104 and the screw rotor main shaft 103.

[0030] When a sleeve 107 is sleeved on the protruding end of the screw rotor main shaft 103 located in the sealed chamber, the first lip seal 101, the second lip seal 102, and the air flotation ring 104 are sleeved on the sleeve 107. When the compressor is operating, the first lip seal 101 and the second lip seal 102 float on the surface of the sleeve 107 and do not contact the sleeve 107, thereby reducing wear.

[0031] In one embodiment, Figure 5 As shown, the second end of the ventilation pipe 106 is connected to the air container of the gas-liquid separation barrel 300 of the compressor via the gas delivery pipe 200. The high-pressure gas-liquid mixture discharged from the compressor enters the gas-liquid separation barrel 300 for gas-liquid separation, and then enters the air container. The high-pressure gas in the air container can be used as the compressed gas source, and the compressor itself is used to supply gas. This air-floating lip seal structure facilitates air supply and simplifies the air supply pipeline structure of the air-floating lip seal structure.

[0032] The gas pressure in the gas container of the gas-liquid separation barrel 300 is relatively high. A pressure regulating valve 400 can be installed on the gas supply pipe 200 to regulate the gas supply pressure. By reducing the gas pressure to 1.5-2 bar via the pressure regulating valve 400 and then delivering it to the air flotation ring 104, the first and second lip seals 101, 102 are separated from the screw rotor main shaft 103, ensuring the air flotation effect while preventing damage to the internal structure of the sealed chamber due to excessive pressure.

[0033] The compressor's air-floating lip seal structure features an air-floating ring 104 positioned between a first lip seal 101 and a second lip seal 102. Air is vented through the air-floating ring 104 to the lips of the first and second lip seals 101, 102 where they meet the compressor's screw rotor main shaft 103, allowing the first and second lip seals 101, 102 to float above the surface of the compressor's screw rotor main shaft 103. This ensures sealing performance while reducing wear on the lip seals and increasing their lifespan. When applied to the compressor's screw rotor main shaft 103, this air-floating lip seal structure utilizes the compressor's own air supply, making air supply convenient. Of course, this air-floating lip seal structure can also be applied to other rotating shaft structures that utilize lip-shaped seals.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air-floating lip seal structure for a screw compressor, characterized in that: It includes a first lip seal and a second lip seal, which are arranged on the protruding end of the compressor screw rotor main shaft and are located in the sealing cavity between the protruding end of the screw rotor main shaft and the head housing; an air flotation ring is arranged between the first lip seal and the second lip seal, and the air flotation ring is arranged on the screw rotor main shaft; the air flotation ring is provided with an air vent that passes through the air flotation ring and extends radially; the housing is provided with a ventilation pipe, the first end of the ventilation pipe is connected to the ventilation hole; the second end of the ventilation pipe is used to connect to the compressed air source.

2. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: The upper end surface of the air flotation ring is in contact with the lower end surface of the first lip seal, and the lower end surface of the air flotation ring is in contact with the upper end surface of the second lip seal.

3. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: There is a gap between the inner wall of the air floating ring and the main shaft of the screw rotor.

4. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: The air flotation ring is provided with a plurality of evenly distributed vent holes along its circumference.

5. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: The air flotation ring includes an I-shaped air flotation ring.

6. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: The extended end sleeve of the screw rotor main shaft located in the sealing cavity is provided with a shaft sleeve, and the first lip seal, the second lip seal and the air flotation ring are sleeved on the shaft sleeve.

7. The air-floating lip seal structure of the compressor according to claim 1, characterized in that: The second end of the ventilation pipe is connected to the air container of the gas-liquid separation barrel of the compressor through the air delivery pipe.

8. The air-floating lip seal structure of the compressor according to claim 7, characterized in that: A pressure regulating valve is provided on the gas transmission pipe.

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