Middle sealer used in piston compressor

Abstract

The utility model discloses a middle sealer used in a piston compressor, belongs to the technical field of sealing of piston compressors, and aims to solve the problems that most of existing middle sealers are of a single-layer sealing structure and have certain limitation on oil vapor blocking, blocked oil vapor is easily attached to the middle sealer to form a carbon deposition type viscous material, and the sealing effect is poor. The middle sealer comprises an aluminum alloy gasket, a first sealing unit, a middle partition plate and a second sealing unit, the aluminum alloy gasket is arranged on the right side of the connecting cylinder middle partition plate, the first sealing unit is arranged at the end, away from the connecting cylinder middle partition plate, of the aluminum alloy gasket, and the second sealing unit is arranged at the end, away from the connecting cylinder middle partition plate, of the aluminum alloy gasket. The second sealing unit is arranged at the end, away from the connecting cylinder middle partition plate, of the first sealing unit, the middle partition plate is arranged between the first sealing unit and the second sealing unit, and the second sealing unit and the middle partition plate are detachably connected with the first sealing unit through a plurality of locking bolts.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston compressor seals, and in particular relates to an intermediate sealer used in a piston compressor. Background Art

[0002] Although the existing refrigerant compressor has an oil scraper as a primary oil separator during operation, the piston structure in the refrigerant compressor is in continuous operation at high temperature and for a long time after all, and the lubricating oil has a certain viscosity, and it is impossible to scrape off all the oil adhering to the piston rod. During the operation of the compressor, the temperature of the lubricating oil is generally maintained between 50℃ and 70℃. The piston rod runs rapidly at a speed of 4000mm / s during operation, causing the surface temperature generated by friction to be maintained between 80℃ and 90℃ for a long time. At this temperature, the lubricating oil will evaporate some oil vapor. In the middle connecting cylinder cavity, since the oil vapor concentration on the left side is higher than that on the right side (the working area of ​​the piston rod crosshead is in the left connecting cylinder), it is necessary to set an intermediate partition between the left connecting cylinder cavity and the right connecting cylinder cavity and correspondingly set an intermediate sealer to effectively prevent the infiltration of oil vapor. Most of the existing intermediate sealers are single-layer sealing structures, which have certain limitations in blocking oil vapor, and the blocked oil vapor is easy to adhere to the intermediate sealer to form carbon deposits. Sticky substances, which will affect the working energy efficiency of the refrigerant compressor in the long run, are based on the above-mentioned defects of the existing intermediate sealer, and further develop an intermediate sealer for use in piston compressors is in line with practical needs. Utility Model Content

[0003] The utility model aims to solve the problem that the existing intermediate sealers are mostly single-layer sealing structures, which have certain limitations in blocking oil vapor, and the blocked oil vapor is easy to adhere to the intermediate sealer to form carbon deposit-like viscous substances, which will affect the working energy efficiency of the refrigerant compressor in the long run, and thus provide an intermediate sealer for a piston compressor;

[0004] A middle sealer for a piston compressor, the middle sealer is located in the space of a connecting tube on the right side of a middle partition of the connecting tube, and the middle sealer is fixedly connected to the middle partition of the connecting tube, and the piston compressor performs sliding sealing on a piston rod through the middle sealer, the middle sealer comprises an aluminum alloy gasket, a No. 1 sealing unit, a middle partition and a No. 2 sealing unit, the aluminum alloy gasket is arranged on the right side of the middle partition of the connecting tube, and one end of the aluminum alloy gasket is welded to the middle partition of the connecting tube, the No. 1 sealing unit is arranged at one end of the aluminum alloy gasket away from the middle partition of the connecting tube, and the No. 1 sealing unit is detachably connected to the aluminum alloy gasket through a plurality of bolts, the No. 2 sealing unit is arranged at one end of the No. 1 sealing unit away from the middle partition of the connecting tube, and a middle partition is arranged between the No. 1 sealing unit and the No. 2 sealing unit, and the No. 2 sealing unit and the middle partition are detachably connected to the No. 1 sealing unit through a plurality of locking bolts;

[0005] Furthermore, the No. 1 sealing unit comprises a No. 1 sealing box, two No. 1 sealing packing sheets and two No. 1 tension springs, the No. 1 sealing box is detachably connected with the aluminum alloy gasket through a plurality of bolts, the two No. 1 sealing packing sheets are spliced ​​into a No. 1 sealing packing through a plurality of No. 1 connecting cylindrical pins, a No. 1 tension spring is mounted on the outer circumferential surface of each No. 1 sealing packing sheet, and the No. 1 sealing packing is installed on the No. 1 sealing box through the two No. 1 tension springs;

[0006] Furthermore, a connecting flange is provided on the outer circumferential surface of the No. 1 sealing box, and the connecting flange is integrally formed with the No. 1 sealing box, and the connecting flange is detachably connected to the aluminum alloy gasket through a plurality of bolts;

[0007] Furthermore, a movable gap is provided between the No. 1 sealing filler and the No. 1 sealing box, and the spacing of the movable gap is 0.10 mm to 0.15 mm;

[0008] Furthermore, the lower part of the No. 1 sealing box is processed with a No. 1 oil guide groove extending vertically downward, and the No. 1 oil guide groove is arranged close to the middle partition;

[0009] Further, the No. 2 sealing unit comprises a No. 2 sealing box, two No. 2 sealing packing sheets and two No. 2 tension springs, the No. 2 sealing box is arranged at one end of the No. 1 sealing box away from the middle partition plate of the connecting tube, and the No. 2 sealing box and the middle partition plate are detachably connected with the No. 1 sealing box through a plurality of locking bolts, the two No. 2 sealing packing sheets are spliced ​​into a No. 2 sealing packing through a plurality of No. 2 connecting cylindrical pins, a No. 2 tension spring is mounted on the outer circumferential surface of each No. 2 sealing packing sheet, and the No. 2 sealing packing is installed on the No. 1 sealing box through the two No. 1 tension springs;

[0010] Furthermore, a movable gap is provided between the No. 2 sealing filler and the No. 2 sealing box, and the spacing of the movable gap is 0.10 mm to 0.15 mm;

[0011] Furthermore, the lower part of the No. 2 sealing box is processed with a No. 2 oil guide groove extending vertically downward, and the No. 2 oil guide groove is arranged close to the middle partition;

[0012] Furthermore, a sealed nitrogen inlet is processed on one end of the No. 2 sealed box away from the middle partition, and the sealed nitrogen inlet is connected to the inner cavity of the No. 2 sealed box;

[0013] Furthermore, an oil retaining ring is sleeved on the piston rod, and the oil retaining ring is fastened to the outer circumferential surface of the piston rod through an oil retaining ring tensioning spring.

[0014] The beneficial effects of this application compared to the prior art are as follows:

[0015] The intermediate sealer for a piston compressor proposed in the present application, compared with the traditional intermediate sealer structure, is extended 50mm to the right on the basis of the original intermediate sealer connection structure to add a set of sealing units, and an aluminum alloy gasket is added to increase the inner space of the left chamber, so that the axial length of the intermediate sealer is greater than the piston rod stroke of 40mm, so as to facilitate the installation of the oil retaining ring on the piston rod, and the setting of the oil retaining ring can effectively prevent the lubricating oil from moving along the movement direction of the piston rod. The design of the double-layer sealing structure can effectively block the oil vapor, and oil guide grooves are set in both sealing units. The pressure in the sealing box is increased by externally injected nitrogen, and the oil vapor retained in the sealing box is discharged along the oil guide groove to the oil collection chamber for reuse. After such a setting, the waste of oil and oil vapor can be avoided, and the carbon deposit-like viscous substance formed by the oil residue in the sealing box can be reduced, which affects the normal operation of the compressor.

[0016] The intermediate sealer for a piston compressor provided by the present application has significantly improved oil (oil vapor) isolation effect in actual applications, and the amount of carbon deposits in the compressor cylinder is significantly reduced. The sticky carbon deposits that were originally difficult to clean, after running for a maintenance cycle (6 months), although there are still carbon deposits in the compressor cylinder, the thickness is reduced and the deposits are dry and can be wiped off with a rag. There is no carbon deposit in the pipes of the compressor aftercooler, and the metallic luster is still present. The effect is obvious. In addition, the present application has a simple structure and a low production cost, and is suitable for promotion and use in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation position of the intermediate sealer described in this application;

[0018] Figure 2 This is a schematic front view of the intermediate sealer described in the present application;

[0019] In the figure, 1 is a connecting tube middle partition, 2 is a connecting tube located on the left side of the connecting tube middle partition, 3 is a connecting tube located on the right side of the connecting tube middle partition, 4 is a piston rod, 41 is an oil deflector ring, 42 is an oil deflector ring tensioning spring, 5 is an oil scraper, 6 is an end sealer, 7 is an intermediate sealer, 71 is an aluminum alloy gasket, 72 is a No. 1 sealing box, 73 is a middle partition, 74 is a No. 2 sealing box, 75 is a No. 1 sealing packing piece, 76 is a No. 1 tensioning spring, 77 is a No. 2 sealing packing piece, 78 is a No. 2 tensioning spring, 79 is a No. 1 oil guide groove, 710 is a No. 2 oil guide groove, 711 is a sealed nitrogen inlet and 712 is a locking bolt. DETAILED DESCRIPTION

[0020] Specific implementation method 1: Combination Figure 1 to Figure 2The present embodiment is described. In the present embodiment, an intermediate sealer for a piston compressor is provided. The intermediate sealer 7 is located in the space of the connecting tube 3 on the right side of the connecting tube intermediate partition 1, and the intermediate sealer 7 is fixedly connected to the connecting tube intermediate partition 1. The piston compressor performs sliding sealing on the piston rod 4 through the intermediate sealer. The intermediate sealer comprises an aluminum alloy gasket 71, a first sealing unit, an intermediate partition 73 and a second sealing unit. The aluminum alloy gasket 71 is arranged on the right side of the connecting tube intermediate partition 1, and one end of the aluminum alloy gasket 71 is welded to the connecting tube intermediate partition 1, the first sealing unit is arranged at the end of the aluminum alloy gasket 71 away from the connecting tube intermediate partition 1, and the first sealing unit is detachably connected to the aluminum alloy gasket 71 by a plurality of bolts, the second sealing unit is arranged at the end of the first sealing unit away from the connecting tube intermediate partition 1, and an intermediate partition 73 is arranged between the first sealing unit and the second sealing unit, and the second sealing unit and the intermediate partition 73 are detachably connected to the first sealing unit by a plurality of locking bolts 712.

[0021] The intermediate sealer provided in this embodiment can effectively combine the oil vapor in the left connecting tube of the connecting tube partition to flow into the right connecting tube by adding a group of sealing structures. The oil (oil vapor) separation effect is obvious and stable. At the same time, the external nitrogen injected by the No. 2 sealing unit can also effectively discharge the oil vapor remaining in the sealing box from the sealing device, so that the oil can be recycled and the accumulation of oil vapor to form a viscous substance that affects the operation of the compressor is avoided.

[0022] Specific implementation method 2: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the No. 1 sealing unit includes a No. 1 sealing box 72, two No. 1 sealing packing sheets 75 and two No. 1 tension springs 76. The No. 1 sealing box 72 is detachably connected to the aluminum alloy gasket 71 by multiple bolts. The two No. 1 sealing packing sheets 75 are spliced ​​into a No. 1 sealing packing by multiple No. 1 connecting cylindrical pins. A No. 1 tension spring 76 is mounted on the outer circumferential surface of each No. 1 sealing packing sheet 75. The No. 1 sealing packing is installed on the No. 1 sealing box 72 through two No. 1 tension springs 76. Other components and connection methods are the same as those of the specific embodiment 1.

[0023] Specific implementation method three: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the second embodiment is that a connecting flange is provided on the outer circumferential surface of the first sealing box 72, and the connecting flange is integrally formed with the first sealing box 72, and the connecting flange is detachably connected to the aluminum alloy gasket 71 through a plurality of bolts. The other components and connection methods are the same as those of the second embodiment.

[0024] In this embodiment, the thickness of the aluminum alloy gasket 71 depends on the moving space of the oil deflector 41 sleeved on the piston rod 4, so that the oil deflector 41 does not collide with the oil scraper box 72 when the piston rod 4 reciprocates.

[0025] Specific implementation method four: Combination Figure 1 to Figure 2 This embodiment is different from the third embodiment in that a movable gap is provided between the first sealing filler and the first sealing box 72, and the spacing of the movable gap is 0.10 mm to 0.15 mm. Other components and connection methods are the same as those of the third embodiment.

[0026] Specific implementation method five: Combination Figure 1 to Figure 2 This embodiment is different from the fourth embodiment in that the lower part of the first sealing box 72 is processed with a first oil guide groove 79 extending vertically downward, and the first oil guide groove 79 is arranged close to the middle partition 73. Other components and connection methods are the same as those of the fourth embodiment.

[0027] In combination with the description of specific implementation methods two to five, the No. 1 sealing filler sheet 75 is made of carbon fiber + copper powder + resin material, has sufficient wear resistance, good thermal conductivity and self-lubricating properties, and at the same time increases the spacing of the active gap between the No. 1 sealing filler and the No. 1 sealing box 72. The active gap in this embodiment is the axial spacing between the sealing filler and the sealing box, and the increase in spacing is adjusted from the original 0.05mm~0.1mm to 0.1mm~0.15mm, and the cross-sectional area of ​​the oil guide groove is set to 5mm×8mm. The purpose of this is to ensure the smooth flow of oil droplets. The oil droplets here are divided into two parts, one part is the oil film scraped off or remaining in the sealing filler, and the other part is the oil vapor blocked in the sealing box.

[0028] Specific implementation method six: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the specific embodiment 5 is that the No. 2 sealing unit includes a No. 2 sealing box 74, two No. 2 sealing packing pieces 77 and two No. 2 tension springs 78. The No. 2 sealing box 74 is arranged at one end of the No. 1 sealing box 72 away from the middle partition 1 of the connecting tube, and the No. 2 sealing box 74 and the middle partition 73 are detachably connected with the No. 1 sealing box 72 through a plurality of locking bolts 712. The two No. 2 sealing packing pieces 77 are spliced ​​into No. 2 sealing packing through a plurality of No. 2 connecting cylindrical pins. A No. 2 tension spring 78 is mounted on the outer circumferential surface of each No. 2 sealing packing piece 77, and the No. 2 sealing packing is installed on the No. 1 sealing box 72 through two No. 1 tension springs 76. Other components and connection methods are the same as those of the specific embodiment 5.

[0029] Specific implementation method seven: Combination Figure 1 to Figure 2This embodiment is described. The difference between this embodiment and the sixth embodiment is that a movable gap is provided between the second sealing filler and the second sealing box 74, and the spacing of the movable gap is 0.10 mm to 0.15 mm. Other components and connection methods are the same as those of the sixth embodiment.

[0030] Specific implementation method eight: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the seventh embodiment is that the lower part of the second sealing box 74 is processed with a second oil guide groove 710 extending vertically downward, and the second oil guide groove 710 is arranged close to the middle partition 73. Other components and connection methods are the same as those of the seventh embodiment.

[0031] Specific implementation method nine: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the eighth embodiment is that a sealed nitrogen inlet 711 is processed on the end of the second sealed box 74 away from the middle partition 73, and the sealed nitrogen inlet 711 is connected to the inner cavity of the second sealed box 74. The other components and connection methods are the same as those of the eighth embodiment.

[0032] In combination with the specific implementations 6 to 9, the No. 2 sealing filler sheet 77 is made of carbon fiber + copper powder + resin material, which has sufficient wear resistance, good thermal conductivity and self-lubricating properties, and at the same time increases the spacing of the active gap between the No. 2 sealing filler and the No. 2 sealing box 74. The active gap in this embodiment is the axial spacing between the sealing filler and the sealing box, and the spacing increase is adjusted from the original 0.05mm~0.1mm to 0.1mm~0.15mm, and the cross-sectional area of ​​the oil guide groove is set to 5mm×8mm. The purpose of this is to ensure The oil droplets flow smoothly, and the oil droplets here are divided into two parts. One part is the oil film scraped off or remaining in the sealing packing, and the other part is the oil vapor blocked in the sealing box. A sealed nitrogen inlet 711 is added to the upper part of the No. 2 sealing box 74, and 0.4MPa~0.5MPa of sealed nitrogen is connected to the sealing box to form a positive pressure of 10KPa~15KPa in the sealing box, which can completely isolate the oil vapor in the left chamber of the middle connecting cylinder from entering the right chamber. At the same time, the droplets accumulated by the oil film scraped off the sealing packing and a small amount of oil vapor that sneaks in can be blown out smoothly along the oil guide groove.

[0033] Specific implementation method ten: Combination Figure 1 to Figure 2 This embodiment is described. The difference between this embodiment and the ninth embodiment is that the piston rod 4 is sleeved with an oil retainer ring 41, and the oil retainer ring 41 is fastened to the outer circumferential surface of the piston rod 4 by an oil retainer ring tension spring 42. Other components and connection methods are the same as those of the ninth embodiment.

[0034] In this embodiment, the oil deflector ring 41 adopts an integrated rubber ring, which can only be installed when the machine is shut down and disassembled; if a split oil deflector ring is used, a clamping mechanism needs to be configured so that it can be installed or replaced at any time when the machine is shut down.

[0035] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0036] How it works

[0037] When the present application is used, the various components are first assembled together according to the connections described in Specific Embodiments 1 to Specific Embodiments 10. With the continuous movement of the piston rod 4, the lubricating oil will evaporate part of the oil vapor under high-speed movement. In the middle cylinder cavity, since the oil vapor concentration on the left side is higher than that on the right side, the oil vapor will move from left to right. When the oil vapor passes through the middle sealer, the sealing filler and nitrogen in the No. 1 sealing unit and the No. 2 sealing unit will block the oil vapor, and the oil vapor will accumulate in the sealing box. With the injection of nitrogen in the No. 2 sealing unit, a discharge power is provided for the oil vapor and oil droplets in the sealing box. Under the action of the high-pressure environment, the oil vapor and oil droplets will be discharged along the oil guide groove to the oil return chamber, thereby reusing the oil.

Claims

1. An intermediate sealer for a piston compressor, wherein the intermediate sealer (7) is located in the space of a connection tube (3) on the right side of a connection tube intermediate partition (1), and the intermediate sealer (7) is fixedly connected to the connection tube intermediate partition (1), and the piston compressor performs sliding sealing on a piston rod (4) through the intermediate sealer, characterized in that: The intermediate sealer comprises an aluminum alloy gasket (71), a first sealing unit, a middle partition (73) and a second sealing unit, wherein the aluminum alloy gasket (71) is arranged on the right side of the middle partition (1) of the connecting tube, and one end of the aluminum alloy gasket (71) is welded to the middle partition (1) of the connecting tube, the first sealing unit is arranged at an end of the aluminum alloy gasket (71) away from the middle partition (1) of the connecting tube, and the first sealing unit is detachably connected to the aluminum alloy gasket (71) via a plurality of bolts, the second sealing unit is arranged at an end of the first sealing unit away from the middle partition (1) of the connecting tube, and a middle partition (73) is arranged between the first sealing unit and the second sealing unit, and the second sealing unit and the middle partition (73) are detachably connected to the first sealing unit via a plurality of locking bolts (712).

2. The intermediate sealer for a piston compressor according to claim 1, characterized in that: The No. 1 sealing unit comprises a No. 1 sealing box (72), two No. 1 sealing packing sheets (75) and two No. 1 tension springs (76); the No. 1 sealing box (72) is detachably connected to the aluminum alloy gasket (71) via a plurality of bolts; the two No. 1 sealing packing sheets (75) are spliced ​​into a No. 1 sealing packing via a plurality of No. 1 connecting cylindrical pins; a No. 1 tension spring (76) is mounted on the outer circumferential surface of each No. 1 sealing packing sheet (75); and the No. 1 sealing packing is mounted on the No. 1 sealing box (72) via the two No. 1 tension springs (76).

3. The intermediate sealer for a piston compressor according to claim 2, characterized in that: A connecting flange is provided on the outer circumferential surface of the first sealing box (72), and the connecting flange and the first sealing box (72) are integrally formed, and the connecting flange is detachably connected to the aluminum alloy gasket (71) via a plurality of bolts.

4. The intermediate sealer for a piston compressor according to claim 3, characterized in that: A movable gap is provided between the No. 1 sealing filler and the No. 1 sealing box (72), and the spacing of the movable gap is 0.10 mm to 0.15 mm.

5. The intermediate sealer for a piston compressor according to claim 4, characterized in that: The lower part of the No. 1 sealing box (72) is processed with a No. 1 oil guide groove (79) extending vertically downward, and the No. 1 oil guide groove (79) is arranged close to the middle partition plate (73).

6. The intermediate sealer for a piston compressor according to claim 5, characterized in that: The No. 2 sealing unit comprises a No. 2 sealing box (74), two No. 2 sealing packing sheets (77) and two No. 2 tension springs (78); the No. 2 sealing box (74) is arranged at one end of the No. 1 sealing box (72) away from the middle partition (1) of the connecting tube, and the No. 2 sealing box (74) and the middle partition (73) are detachably connected to the No. 1 sealing box (72) through a plurality of locking bolts (712); the two No. 2 sealing packing sheets (77) are spliced ​​into a No. 2 sealing packing through a plurality of No. 2 connecting cylindrical pins; a No. 2 tension spring (78) is mounted on the outer circumferential surface of each No. 2 sealing packing sheet (77); and the No. 2 sealing packing is installed on the No. 1 sealing box (72) through two No. 1 tension springs (76).

7. An intermediate sealer for a piston compressor according to claim 6, characterized in that: A movable gap is provided between the No. 2 sealing filler and the No. 2 sealing box (74), and the spacing of the movable gap is 0.10 mm to 0.15 mm.

8. The intermediate sealer for a piston compressor according to claim 7, characterized in that: The lower part of the No. 2 sealing box (74) is processed with a No. 2 oil guide groove (710) extending vertically downward, and the No. 2 oil guide groove (710) is arranged close to the middle partition plate (73).

9. An intermediate sealer for a piston compressor according to claim 8, characterized in that: A sealed nitrogen inlet (711) is processed on one end of the No. 2 sealed box (74) away from the middle partition (73), and the sealed nitrogen inlet (711) is connected to the inner cavity of the No. 2 sealed box (74).

10. An intermediate sealer for a piston compressor according to claim 9, characterized in that: The piston rod (4) is sleeved with an oil retaining ring (41), and the oil retaining ring (41) is fastened to the outer circumferential surface of the piston rod (4) via an oil retaining ring tensioning spring (42).

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