A piston rod protection device for a piston compressor

Abstract

The utility model relates to a compressor technical field especially relates to a piston rod protection device of piston compressor, including piston rod protection sleeve installation box, gas leakage ring packing box, main packing box, air extraction sealing packing box and piston rod protection sleeve, the piston rod protection sleeve presents ring structure, and its inner wall is along the axial equal interval and is equipped with a plurality of packing groove for placing packing ring, the outer wall below of piston rod protection sleeve is equipped with the limit ring integrally formed with one, the piston rod protection sleeve installation box presents ring structure, and its inner wall below is equipped with the limit ring groove that limit ring shape is matched with one, the utility model discloses piston rod protection sleeve adopts solid round steel integrated processing, and the packing groove in its inner wall is equipped with the packing ring that adopts graphite modified four fluorine materials to make, can increase dynamic lubrication and increase piston rod piston passing surface area, to reduce the unit area friction of each group packing in packing function effectively.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a piston rod protection device for a piston compressor. Background Technology

[0002] It is difficult to completely seal the cylinder of a reciprocating compressor from the outside air. If the wear of the packing and piston rod is aggravated, the production stability will be affected. At the same time, it will increase the risk of leakage, pollute the environment, and increase the cost of equipment management due to frequent maintenance by users.

[0003] The piston's casting process, material selection, and the piston force during operation determine that its weight cannot be reduced to an ideal state. If the compressor requires a large air volume, it will inevitably result in an excessively long piston rod and an increased piston weight. Due to the crankshaft's circular motion combined with the reciprocating motion of the heavier piston, the packing seal area feels as if it is being constantly "sawed" back and forth by the piston rod. If the compressed gas contains corrosive or impurity particles, it will bring a high risk of leakage and frequent maintenance. Most importantly, it will disrupt continuous and stable production, affecting the user's planned production achievement rate.

[0004] Based on the above reasons, this utility model designs a piston rod protection device for a piston compressor. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a piston rod protection device for a piston compressor. The piston rod protection sleeve is made of solid round steel in one piece, and the packing groove on its inner wall is provided with a packing ring made of graphite modified PTFE material, which can increase dynamic lubrication and increase the piston rod piston passing surface area, thereby effectively reducing the unit area friction force of each packing in the stuffing box.

[0006] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: This utility model discloses a piston rod protection device for a piston compressor, including a piston rod protection sleeve mounting box, a leakage ring packing box, a main packing box, a suction sealing packing box, and a piston rod protection sleeve. The piston rod protection sleeve has an annular structure, and its inner wall is provided with a plurality of packing rings at equal intervals along the axial direction. The packing rings are made of graphite modified PTFE material. A limiting ring integrally formed with the outer wall of the piston rod protection sleeve is provided. The piston rod protection sleeve mounting box has an annular structure, and its inner wall has a limiting ring groove matching the shape of the limiting ring. The leakage ring packing box, the main packing box, and the suction sealing packing box are all annular structures, and the ends of the piston rod protection sleeve mounting box, the leakage ring packing box, the main packing box, and the suction sealing packing box are connected sequentially by connecting bolts.

[0007] The air leakage ring packing box includes a first air leakage ring packing box and a second air leakage ring packing box. The lower inner wall of the first air leakage ring packing box is provided with a first mounting groove for installing air leakage rings and main packing. The lower inner wall of a plurality of second air leakage ring packing boxes is provided with a second mounting groove for installing two main packings and two sealing rings. The top of the first air leakage ring packing box contacts the bottom of the piston rod protective sleeve mounting box. A plurality of second air leakage ring packing boxes are provided between the first air leakage ring packing box and the main packing box.

[0008] The inner wall of the main packing box is provided with a third mounting groove for placing a number of main packings at the bottom. The inner wall of the main packing box is provided with a hemispherical groove with a semi-circular cross-section at the top. The bottom side of the main packing box is provided with a first air extraction channel, and the top of the first air extraction channel is connected to the inner cavity of the hemispherical groove.

[0009] The outer and inner diameters of the piston rod protective sleeve mounting box, the air leakage ring packing box, and the main packing box are all equal; the outer diameter of the air extraction sealing packing box is larger than the outer diameter of the main packing box, and the inner diameter of the air extraction sealing packing box is equal to the inner diameter of the main packing box; a second air extraction channel in the shape of an inverted "L" is provided on one side of the bottom end of the air extraction sealing packing box, and the top end of the second air extraction channel can communicate with the bottom end of the first air extraction channel.

[0010] The ends of the air leakage ring packing box, the main packing box, and the air extraction sealing packing box are arranged in a ring array with several bolt holes for connecting bolts to pass through. The bottom end of the piston rod protective sleeve mounting box is provided with a threaded hole coaxial with the bolt holes. The threaded hole is threadedly connected to the external thread of the outer wall of the connecting bolt.

[0011] The beneficial effects of this utility model are as follows:

[0012] (1) The piston rod protective sleeve of this utility model is made of solid round steel in one piece. The packing groove on its inner wall is provided with a packing ring made of graphite modified PTFE material, which can increase dynamic lubrication and increase the piston rod piston passing surface area, thereby effectively reducing the unit area friction force of each packing in the stuffing box.

[0013] (2) This utility model connects the second suction channel with the first suction channel, and can draw nitrogen gas through the pressure difference on both sides of the piston rod protective sleeve to effectively blow out the impurity gas that leaks slightly on the cylinder side and increase service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the attached diagram, 1 is the piston rod protective sleeve mounting box, 2 is the air leakage ring packing box, 3 is the main packing box, 4 is the air extraction sealing packing box, 5 is the piston rod protective sleeve, 6 is the air leakage ring, 7 is the main packing, 8 is the sealing ring, 9 is the bolt hole, 10 is the connecting bolt, 11 is the limiting ring groove, 12 is the threaded hole, 21 is the first air leakage ring packing box, 22 is the second air leakage ring packing box, 23 is the first mounting groove, 24 is the second mounting groove, 31 is the third mounting groove, 32 is the hemispherical groove, 33 is the first air extraction channel, 41 is the second air extraction channel, 51 is the packing groove, and 52 is the limiting ring. Detailed Implementation

[0016] The present invention will be further described below:

[0017] Please see Figure 1 ,

[0018] This utility model discloses a piston rod protection device for a piston compressor, including a piston rod protective sleeve mounting box 1, a leakage ring packing box 2, a main packing box 3, a suction sealing packing box 4, and a piston rod protective sleeve 5. The piston rod protective sleeve 5 has an annular structure, and its inner wall is provided with a plurality of packing grooves 51 at equal intervals along the axial direction for placing packing rings. The packing rings are made of graphite modified PTFE material. A limiting ring 52 integrally formed with the piston rod protective sleeve 5 is provided on the lower part of the outer wall of the piston rod protective sleeve 5. The piston rod protective sleeve mounting box 1 has an annular structure, and its inner wall is provided with a limiting ring 52 integrally formed with the limiting ring 52. 2. A matching limiting ring groove 11; the leakage ring packing box 2, the main packing box 3, and the extraction sealing packing box 4 are all annular structures. The ends of the piston rod protective sleeve mounting box 1, the leakage ring packing box 2, the main packing box 3, and the extraction sealing packing box 4 are connected sequentially by connecting bolts 10. The piston rod protective sleeve 5 is made of solid round steel in one piece. The packing groove 51 on its inner wall is equipped with a packing ring made of graphite modified PTFE material, which can increase dynamic lubrication and increase the piston rod piston passage surface area, thereby effectively reducing the unit area friction force of each packing group in the stuffing box. Graphite modified PTFE material is an existing composite material, based on polytetrafluoroethylene resin, and made by adding fillers such as graphite and glass fiber through mixing molding and high-temperature sintering process. Compared with traditional PTFE material, this product effectively overcomes cold flow and creep defects through filler modification, and has better compressive strength and sealing durability.

[0019] Furthermore, the air leakage ring packing box 2 includes a first air leakage ring packing box 21 and a second air leakage ring packing box 22. The lower inner wall of the first air leakage ring packing box 21 is provided with a first mounting groove 23 for installing an air leakage ring 6 and a main packing 7. The lower inner wall of a plurality of second air leakage ring packing boxes 22 is provided with a second mounting groove 24 for installing two main packings 7 and two sealing rings 8. The top of the first air leakage ring packing box 21 contacts the bottom of the piston rod protective sleeve mounting box 1. A plurality of second air leakage ring packing boxes 22 are provided between the first air leakage ring packing box 21 and the main packing box 3.

[0020] Furthermore, the inner wall of the main packing box 3 is provided with a third mounting groove 31 for placing a plurality of main packings 7 at the lower part, and a hemispherical groove 32 with a semi-circular cross section is provided on the upper part of the inner wall of the main packing box 3. A first air extraction channel 33 is provided on one side of the bottom end of the main packing box 3, and the top end of the first air extraction channel 33 is connected to the inner cavity of the hemispherical groove 32.

[0021] Furthermore, the outer and inner diameters of the piston rod protective sleeve mounting box 1, the leaking ring packing box 2, and the main packing box 3 are all equal; the outer diameter of the vacuum sealing packing box 4 is larger than that of the main packing box 3, which facilitates the provision of a connection hole at the outer end of the vacuum sealing packing box 4 for connection with the end cap; the inner diameter of the vacuum sealing packing box 4 is equal to that of the main packing box 3; a second vacuum channel 41 in the shape of an inverted "L" is provided on one side of the bottom end of the vacuum sealing packing box 4, the top end of the second vacuum channel 41 can communicate with the bottom end of the first vacuum channel 33, and the connection between the second vacuum channel 41 and the first vacuum channel 33 allows nitrogen gas to be drawn through the pressure difference on both sides of the piston rod protective sleeve, which can effectively blow out the impurities leaking slightly on the cylinder side and increase service life.

[0022] Furthermore, the ends of the air leakage ring packing box 2, the main packing box 3, and the air extraction sealing packing box 4 are arranged in a ring with several bolt holes 9 for the connecting bolts 10 to pass through. The bottom end of the piston rod protective sleeve mounting box 1 is provided with a threaded hole 12 coaxial with the bolt holes 9. The threaded hole 12 is threadedly connected to the external thread of the outer wall of the connecting bolt 10. After the connecting bolt 10 passes through the bolt holes 9 of the air extraction sealing packing box 4, the main packing box 3, and the air leakage ring packing box 2 in sequence, it is threadedly connected to the threaded hole 12 of the piston rod protective sleeve mounting box 5, thus completing the connection of the piston rod protective sleeve mounting box 5, the air leakage ring packing box 2, the main packing box 3, and the air extraction sealing packing box 4.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A piston rod protection device for a piston compressor, characterized in that: It includes a piston rod protective sleeve mounting box (1), a leaking ring packing box (2), a main packing box (3), an air extraction sealing packing box (4), and a piston rod protective sleeve (5). The piston rod protective sleeve (5) has an annular structure, and its inner wall is provided with a plurality of packing grooves (51) at equal intervals along the axial direction for placing packing rings. The packing rings are made of graphite modified PTFE material. The piston rod protective sleeve (5) has an integrally formed limiting ring (52) on its outer wall. The piston rod protective sleeve mounting box (1) has an annular structure, and its inner wall has a limiting ring groove (11) that matches the shape of the limiting ring (52). The air leakage ring packing box (2), the main packing box (3) and the air extraction sealing packing box (4) are all annular structures. The ends of the piston rod protective sleeve mounting box (1), the air leakage ring packing box (2), the main packing box (3) and the air extraction sealing packing box (4) are connected in sequence by connecting bolts (10).

2. The piston rod protection device for a piston compressor according to claim 1, characterized in that: The air leakage ring packing box (2) includes a first air leakage ring packing box (21) and a second air leakage ring packing box (22). The lower inner wall of the first air leakage ring packing box (21) is provided with a first mounting groove (23) for installing an air leakage ring (6) and a main packing (7). The lower inner wall of a plurality of second air leakage ring packing boxes (22) is provided with a second mounting groove (24) for installing two main packings (7) and two sealing rings (8). The top of the first air leakage ring packing box (21) is in contact with the bottom of the piston rod protective sleeve mounting box (1). A plurality of second air leakage ring packing boxes (22) are provided between the first air leakage ring packing box (21) and the main packing box (3).

3. The piston rod protection device for a piston compressor according to claim 2, characterized in that: The inner wall of the main packing box (3) is provided with a third mounting groove (31) for placing a number of main packings (7) at the bottom. The inner wall of the main packing box (3) is provided with a hemispherical groove (32) with a semi-circular cross section at the top. The bottom side of the main packing box (3) is provided with a first air extraction channel (33), and the top of the first air extraction channel (33) is connected to the inner cavity of the hemispherical groove (32).

4. A piston rod protection device for a piston compressor according to claim 3, characterized in that: The outer and inner diameters of the piston rod protective sleeve mounting box (1), the air leakage ring packing box (2), and the main packing box (3) are all equal; the outer diameter of the air extraction sealing packing box (4) is larger than the outer diameter of the main packing box (3), and the inner diameter of the air extraction sealing packing box (4) is equal to the inner diameter of the main packing box (3); a second air extraction channel (41) in the shape of an inverted "L" is provided on one side of the bottom end of the air extraction sealing packing box (4), and the top end of the second air extraction channel (41) can communicate with the bottom end of the first air extraction channel (33).

5. A piston rod protection device for a piston compressor according to claim 1, characterized in that: The ends of the air leakage ring packing box (2), the main packing box (3) and the air extraction sealing packing box (4) are arranged in a ring array with several bolt holes (9) for the connecting bolts (10) to pass through. The bottom end of the piston rod protective sleeve mounting box (1) is provided with a threaded hole (12) coaxial with the bolt hole (9). The threaded hole (12) is threadedly connected to the external thread of the outer wall of the connecting bolt (10).

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