CN113217336A

CN113217336A - Pump-free lubricating and sealing system and method for reciprocating compressor

Info

Publication number: CN113217336A
Application number: CN202110515712.7A
Authority: CN
Inventors: 王锐锋
Original assignee: Beijing Jerrywon Energy Equipment Manufacture Co ltd
Current assignee: Beijing Jerrywon Energy Equipment Manufacture Co ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-08-06

Abstract

The application relates to a pump-free lubrication seal and a system of a reciprocating compressor, which comprises a cylinder, wherein a sliding compression block is hermetically and slidably connected in the cylinder, a driving rod is fixedly connected on the sliding compression block, the driving rod extends out of the cylinder, and a stuffing box for guiding the driving rod to move is sleeved on the outer side of the driving rod; an air inlet valve and an air outlet valve are fixedly arranged at both ends of the air cylinder, a lubricating port for feeding lubricating oil into an inner cavity of the air cylinder is fixedly arranged on the air cylinder, a pressure oil cavity is arranged in an inner cavity of the stuffing box, and a lubricating oil tank for feeding the lubricating oil into the pressure oil cavity is connected to the stuffing box; a lubricating oil main pipe which is communicated with the lubricating port is arranged between the lubricating oil tank and the lubricating port, and the lubricating oil main pipe can only convey lubricating oil to the lubricating port in a one-way manner; the lubricating oil tank is communicated with an exhaust valve, and the exhaust valve feeds high-pressure gas into the lubricating oil vent pipe. The method and the device have the effect of reducing the fault rate of the whole machine.

Description

Pump-free lubricating and sealing system and method for reciprocating compressor

Technical Field

The present application relates to the field of reciprocating compressors, and more particularly, to a pump-less lubrication sealing system and method for a reciprocating compressor.

Background

The present reciprocating compressor comprises a cylinder in which a cavity is arranged and a device capable of reciprocating, said device comprising a piston and a piston rod, said reciprocating compressor further comprising a driving member configured to move said device in a reciprocating motion.

The reciprocating compressor pumps lubricating oil to a cylinder and a filler respectively by an oil pump, generally a plunger pump, for lubrication and auxiliary sealing; the reciprocating compressor is fixedly provided with a stuffing box sleeved outside the piston rod, the seasoning box is provided with a lubricating oil tank, and the existing lubricating oil in the lubricating oil tank enters between the piston rod and the stuffing box to lubricate the piston rod.

Aiming at the related technologies, the inventor thinks that the plunger pump unit needs a certain cost, the plunger pump is provided with a motor for driving the plunger pump, and the plunger pump unit has a certain fault rate as a whole, so that the defect of the fault rate of the whole compressor is increased; on the other hand, current compressor uses, when cylinder inner chamber was the negative pressure, cylinder inner chamber pressure was less than external atmospheric pressure this moment, has a small amount of air and gets into cylinder inner chamber through the condiment box, and when the gas of compressor compression was combustible gas, the air admission compressor inner chamber can cause the potential safety hazard, for avoiding the air admission compressor inner chamber, installs the high pressure nitrogen charging device additional, then the cost can show and increase.

Disclosure of Invention

In order to reduce the failure rate of the whole machine, the application provides a pump-free lubricating and sealing system and method of a reciprocating compressor.

In a first aspect, the present application provides a pump-less lubrication sealing system for a reciprocating compressor, which adopts the following technical scheme:

a pump-free lubricating and sealing system of a reciprocating compressor comprises a cylinder, wherein a sliding compression block is connected in the cylinder in a sealing and sliding manner, a driving rod is fixedly connected to the sliding compression block, the driving rod extends out of the cylinder and can keep the relative sealing between the inner cavity of the cylinder and the atmosphere when sliding, a stuffing box for guiding the driving rod to move is sleeved on the outer side of the driving rod and is fixedly connected with the cylinder, a hole for accommodating the driving rod to penetrate through is a guide hole, the guide hole is communicated with the inner cavity of the cylinder, and the stuffing box and the cylinder are relatively stable; an air inlet valve communicated with an inner cavity of the air cylinder is fixedly arranged at each of two ends of the air cylinder, an exhaust valve communicated with the inner cavity of the air cylinder is fixedly arranged at each of two ends of the air cylinder, a lubricating port for feeding lubricating oil into the inner cavity of the air cylinder is fixedly arranged on the air cylinder, the lubricating oil sprayed out from the lubricating port can enter two ends of the sliding compression block in the moving direction, an isolation cavity and a pressure oil cavity which are communicated with the guide hole are arranged in the inner cavity of the stuffing box, and the isolation cavity is positioned between the pressure oil cavity and the air cylinder; the isolation cavity is communicated with an air inlet pipeline where the air inlet valve is located;

after the driving rod is connected with the stuffing box, the isolation cavity and the pressure oil cavity are relatively sealed with the outside atmosphere, and a lubricating oil tank for feeding lubricating oil into the pressure oil cavity is connected to the stuffing box;

a lubricating oil main pipe for communicating the pressure oil cavity with the lubricating port is arranged between the pressure oil cavity and the lubricating port, and the lubricating oil main pipe can only convey lubricating oil to the lubricating port in a one-way manner;

and the lubricating oil tank is communicated with a lubricating oil high-pressure air inlet pipe, and the lubricating oil high-pressure air inlet pipe is communicated with an air outlet pipeline where the exhaust valve is located.

By adopting the technical scheme, when the exhaust valve outputs high-pressure gas, the high-pressure gas enters the lubricating oil tank, the lubricating oil in the lubricating oil tank is pressed into the pressure oil cavity, the lubricating oil filled in the pressure oil cavity can lubricate the sliding between the driving rod and the stuffing box, the high-pressure gas exhausted by the exhaust valve is used as a high-pressure gas source of the lubricating oil tank, the lubricating oil tank in the lubricating oil tank is pressed into the pressure oil cavity, an external pressure gas source or a plunger pump is avoided, the integral failure rate of equipment is reduced, the pump-free lubrication is realized, and the failure points of the equipment are reduced;

meanwhile, because the pressure in the pressure oil cavity of the stuffing box is always greater than the external atmospheric pressure, an isolation cavity is arranged between the air cylinder and the pressure oil cavity of the stuffing box and is communicated with the air inlet, the internal pressure of the isolation cavity is always lower than the pressure in the pressure oil cavity, and the air cannot leak into the air cylinder when the pressure in the air cylinder is negative;

meanwhile, when the pressure of the inner cavity of the cylinder is overlarge, the high-temperature and high-pressure process gas enters the isolation cavity, and the lubricating oil in the isolation cavity is prevented from being oxidized and foamed due to the fact that the high-temperature and high-pressure process gas leaks into the packing pressure oil cavity from the cylinder; the isolation and sealing of negative pressure in the cylinder are realized, and the application range of the compressor to different working conditions is expanded; this scheme is particularly useful for low-speed compressor's use.

Preferably, a throttle valve and a check valve are arranged on the lubricating oil main pipe.

By adopting the technical scheme, the flow of the lubricating oil entering the cylinder is limited by the throttle valve; the one-way valve ensures the one-way movement of the fluid in the lubricating oil main pipe, and prevents the gas in the cylinder from entering the lubricating oil main pipe to cause air blockage.

Preferably, the oil storage tank has been seted up to the compression piece lateral wall that slides, the compression piece lateral wall that slides has set firmly two sealing rings, and two sealing rings are located the oil storage tank along the compression piece slip direction both ends that slide.

By adopting the technical scheme, when the lubricating port does not send lubricating oil into the inner cavity of the cylinder and the sliding compression block and the cylinder move relatively, namely the compressor starts to start, the lubricating oil stored in the oil storage tank last time can lubricate the moving sliding compression block.

Preferably, an oil supplementing system is arranged on the lubricating oil tank, the oil supplementing system comprises a high-level oil tank, an oil supplementing pipe is arranged between the high-level oil tank and the lubricating oil tank, and the high-level oil tank feeds lubricating oil into the lubricating oil tank through the oil supplementing pipe.

Through adopting above-mentioned technical scheme, mend oil in to the lubricating oil jar through high-order oil tank, guarantee lubricating oil tank inner chamber have lubricating oil all the time, the long-time use of the compressor of being convenient for.

Preferably, the high-level oil tank is communicated with the atmosphere, and a check valve is arranged on the oil supplementing pipe;

the lubricating oil tank is communicated with a lubricating oil vent pipe, the lubricating oil vent pipe is communicated with a three-way valve, one valve port of the three-way valve is communicated with the atmosphere, and the other valve port of the three-way valve is communicated with a lubricating oil high-pressure air inlet pipe.

By adopting the technical scheme, the lubricating oil vent pipe can be communicated with the atmosphere through the three-way valve, and the lubricating oil vent pipe is isolated from the lubricating oil high-pressure air inlet pipe in a closed manner; the three-way valve can realize the communication of the lubricating oil vent pipe and the lubricating oil high-pressure air inlet pipe, the lubricating oil vent pipe is isolated from the atmosphere in a sealing mode, and high-pressure oil can be supplemented to the inner cavity of the lubricating oil tank when the lubricating oil vent pipe is communicated with the atmosphere.

Preferably, a cooling and separating device is arranged on the lubricating oil high-pressure air inlet pipe.

By adopting the technical scheme, the purity of the gas output to the next working procedure is further improved, the content of water molecules in the gas is reduced, the temperature of the gas is reduced, and the emulsification and oxidation of the lubricating oil in the lubricating oil tank are prevented.

Preferably, the outer side of the sliding compression block is fixedly provided with two support rings which are arranged at intervals along the sliding direction of the sliding compression block;

a sealing ring is fixedly arranged on the outer side of the sliding compression block;

two sealing rings which are positioned at two ends of the pressure oil cavity along the sliding direction of the driving rod are fixedly arranged on the inner side of the stuffing box;

and the stuffing box is connected with a dustproof ring.

By adopting the technical scheme, the support ring reduces the abrasion between the sliding compression block and the inner wall of the cylinder, so that the sliding of the sliding compression block is facilitated; the sealing ring ensures good sealing effect of the pressure oil cavity; the dustproof ring blocks external particles from entering a gap between the stuffing box and the driving rod.

In a second aspect, the present application provides a method for lubricating and sealing a reciprocating compressor without a pump, which adopts the following technical scheme:

a lubrication method of a reciprocating compressor comprises a cylinder, wherein a sliding compression block is connected in the cylinder in a sealing and sliding manner, a driving rod is fixedly connected to the sliding compression block, the driving rod extends out of the cylinder, and the driving rod can keep the relative sealing between the inner cavity of the cylinder and the atmosphere when sliding; an air inlet valve communicated with the inner cavity of the air cylinder is fixedly arranged at each of two ends of the air cylinder, an exhaust valve communicated with the inner cavity of the air cylinder is fixedly arranged at each of two ends of the air cylinder, a lubricating port for feeding lubricating oil into the inner cavity of the air cylinder is fixedly arranged on the air cylinder, and the lubricating port is positioned in the middle area of the air cylinder in the length direction;

the minimum air inlet pressure Ps of the cylinder is less than the atmospheric pressure P0, and the pressure loss of pipelines and valves at each position is taken into account; the pressure Pl of the lubricating oil at the oil injection point of the cylinder is less than the exhaust pressure Pd and greater than the atmospheric pressure P0; e is the middle point of the cylinder, a and c are respectively the no-rod side dead point and the rod side dead point of the sliding compression block, and the moving direction of the sliding compression block changes when the sliding compression block moves to a and c; pl is oil injection point lubricating oil pressure; the oil spraying point is the point of the lubricating port; one side of the sliding compression block in the inner cavity of the cylinder, which compresses gas, in two sides of the sliding compression block along the axis direction is a compression side, and one side of the cylinder, which sucks gas, is a suction side;

when the compression ratio is larger, when the sliding compression block moves at a → e, the pressure on the compression side is smaller than the exhaust pressure and smaller than the oil pressure of lubricating oil at the oil injection point;

when the sliding compression block moves from the position a → e, pressure is applied to the lubricating oil in the lubricating port, so that the pressure of an oil injection point is greater than the pressure on the compression side of the inner cavity of the cylinder; when the sliding compression block e → c moves, applying pressure to the lubricating oil in the lubricating port to ensure that the pressure of an oil injection point is greater than the pressure of the air suction side of the inner cavity of the cylinder, and the oil injection point can spray the lubricating oil;

when the compression ratio is small, when the sliding compression block moves at the position a → e, the pressure at the compression side is smaller than the exhaust pressure and gradually changes to be equal to or larger than the oil pressure of lubricating oil at the oil injection point, and at the moment, a point b exists, wherein the point b is the position of a cylinder corresponding to the intersection point of the Pl and the air pressure at the compression side;

point a → b, lubricating oil is sprayed on the compression side; b → e, because the oil injection point is still positioned at the compression side and the pressure in the cylinder is higher than the oil pressure Pl of the oil injection point, the system does not inject oil; e → c, the oil injection point enters the air suction side, and oil injection is started until the sliding compression block runs to the rod side dead center c.

Through adopting above-mentioned technical scheme, at the cylinder initial stage that starts, the compression ratio is less, and this scheme realizes that the small compression ratio is little, provides a small amount of lubricating oil for the cylinder inner chamber, and when the cylinder steady operation, under the great condition of compression, provides appropriate amount lubricating oil for the cylinder inner chamber.

Preferably, the air outlet pressure of the exhaust valve provides pressure for lubricating oil in the inner cavity of the lubricating port.

By adopting the technical scheme, the lubricating oil pressure provided by external equipment is avoided, and the integral failure rate of the equipment is reduced.

Preferably, the sliding compression block side wall is provided with an oil storage tank, the oil storage tank is communicated with the cylinder inner cavity, and two ends of the sliding compression block are relatively closed.

Through adopting above-mentioned technical scheme, when being convenient for the compressor to open, when the compressor compression ratio reduces, the lubricating oil of oil storage tank inner chamber provides lubricated effect for the slip of slip compression piece.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the exhaust valve outputs high-pressure gas, the high-pressure gas enters the lubricating oil tank, lubricating oil in the lubricating oil tank is pressed into the pressure oil cavity, the lubricating oil filled in the pressure oil cavity can lubricate the sliding between the driving rod and the stuffing box, the high-pressure gas exhausted by the exhaust valve is used as a high-pressure gas source of the lubricating oil tank, the lubricating oil tank in the lubricating oil tank is pressed into the pressure oil cavity, an external pressure gas source or a plunger pump is avoided, the integral failure rate of equipment is reduced, pump-free lubrication is realized, and failure points of the equipment are reduced;

meanwhile, because the pressure in the pressure oil cavity in the stuffing box is always greater than the external atmospheric pressure, an isolation cavity is arranged between the air cylinder and the pressure oil cavity of the stuffing box and is communicated with the air inlet, the internal pressure of the isolation cavity is always lower than the pressure in the pressure oil cavity, and the air cannot leak into the air cylinder when the pressure in the air cylinder is negative; meanwhile, when the pressure of the inner cavity of the cylinder is overlarge, the high-temperature and high-pressure process gas enters the isolation cavity, and the lubricating oil in the isolation cavity is prevented from being oxidized and foamed due to the fact that the high-temperature and high-pressure process gas leaks into the packing pressure oil cavity from the cylinder; the isolation and sealing of negative pressure in the cylinder are realized, and the application range of the compressor to different working conditions is expanded;

2. through the communication of the different valve ports of the three-way valve, the supplement of the lubricating oil in the inner cavity of the lubricating oil tank by the high-level oil tank is realized.

Drawings

FIG. 1 is a schematic diagram of an overall structural system of the embodiment;

FIG. 2 is a schematic structural diagram of the working condition of the cylinder pressure and the volume at a high pressure ratio in the embodiment;

FIG. 3 is a schematic diagram of the structure of the cylinder pressure and volume at low pressure ratio in the embodiment.

Description of reference numerals: 1. a cylinder; 11. an intake valve; 12. an exhaust valve; 121. a high pressure gas output pipe; 13. lubricating the opening; 2. sliding the compression block; 21. an oil storage tank; 22. a support ring; 3. a drive rod; 4. a stuffing box; 41. a guide hole; 42. a pressure oil chamber; 43. an isolation chamber; 44. a lubricating oil main pipe; 45. a throttle valve; 5. a lubricating oil tank; 51. a lubricating oil high-pressure air inlet pipe; 52. a lubricating oil breather pipe; 53. a three-way valve; 54. a cooling separation device; 55. a lubricating oil supply pipe; 6. a high-level oil tank; 61. supplementing an oil pipe; 7. a seal ring; 8. and a dust ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a pump-free lubricating and sealing system and method for a reciprocating compressor. Referring to fig. 1, a reciprocating compressor pump-free lubrication sealing system includes a cylinder 1, the cylinder 1 is a cylindrical tube with two closed ends, a sliding compression block 2 is hermetically and slidably connected in the cylinder 1, the sliding compression block 2 is a piston in this embodiment, and the sliding compression block 2 is a plunger in another embodiment. The lateral surface of the sliding compression block 2 is provided with four annular inner grooves at intervals along the axial direction thereof, wherein two annular inner grooves are internally sleeved with support rings 22, the other two annular inner grooves are internally sleeved with sealing rings 7, and the two support rings 22 are positioned on the outer sides of the two sealing rings 7. The sealing ring 7 is a dynamic sealing ring, so that when the sliding compression block 2 slides in the inner cavity of the cylinder 1, the sealing between the sliding compression block 2 and the cylinder 1 is realized. The support ring 22 is the ring body with the side high accuracy complex in the cylinder 1, and two support rings 22 can improve the stability when sliding compression piece 2 slides, reduce the sliding resistance between sliding compression piece 2 and the cylinder 1 simultaneously, and support ring 22 can reduce the processing degree of difficulty of sliding compression piece 2, the processing of the compression piece 2 of being convenient for slide.

The cylinder 1 is divided into two relatively independent closed chambers by the sliding compression block 2, the two chambers are respectively an inner chamber and an outer chamber, and the sealing ring 7 keeps the relative closure between the inner chamber and the outer chamber.

The outer sides of the two ends of the air cylinder 1 are fixedly provided with air inlet valves 11 communicated with the inner cavities of the air cylinder, pipelines for guiding air to enter the air cylinder 1 through the air inlet valves 11 are air inlet pipelines, the air inlet pipelines of the air inlet valves 11 are communicated with natural gas in the embodiment, the communicated air in other embodiments is air, the air inlet valves 11 can be controlled to be opened or closed, in the embodiment, the air inlet valves 11 are one-way air inlet valves, when the pressure difference between the two ends of the air inlet valves 11 meets the opening pressure difference, the air inlet valves 11 are opened, and at the moment, the air to be compressed can enter the air cylinder 1. When the air inlet valve 11 is opened, the cavity of the cylinder 1 is communicated with the outside atmosphere.

The two ends of the cylinder 1 are fixedly provided with exhaust valves 12 communicated with the inner cavities of the cylinder, the exhaust valves 12 can be controlled to be opened or closed, in the embodiment, the exhaust valves 12 are one-way intake valves, and when the pressure difference between the two ends of the exhaust valves 12 meets the opening pressure difference, and the exhaust valves 12 are opened, high-pressure gas in the cylinder 1 is output to the next working procedure. The exhaust valve 12 is communicated with a high-pressure gas output pipe 121, and the high-pressure gas output pipe 121 is used for conveying the high-pressure gas discharged by the exhaust valve 12 to the next working procedure. In another embodiment, the intake valve 11 and the exhaust valve 12 are electromagnetic switch valves that can be opened or closed independently.

Fixedly connected with actuating lever 3 on the compression piece 2 slides, and actuating lever 3 is the round bar coaxial with the compression piece 2 that slides, and actuating lever 3 stretches out cylinder 1 along the one end of the 2 slip directions of compression piece that slide, has seted up on the cylinder 1 and has held the round hole that actuating lever 3 stretched out. The outside cover of actuating lever 3 is equipped with the stuffing box 4 that guides actuating lever 3 to remove, and be connected steadily between stuffing box 4 and the cylinder 1, do not take place relative movement when using, in this embodiment, the one end and the cylinder 1 fixed connection of stuffing box 4, through flange sealing connection between stuffing box 4 and the cylinder 1, in other embodiment, stuffing box 4 and cylinder 1 integrated into one piece, in other embodiment have the clearance between stuffing box 4 and the cylinder 1, stuffing box 4 and cylinder 1 all fixed settings, keep stable between. The stuffing box 4 is a circular tube in the embodiment, a hole on the stuffing box 4 for accommodating the driving rod 3 to pass through is a guide hole 41, the guide hole 41 is matched with the driving rod 3 with high precision, and the stuffing box 4 supports and guides the driving rod 3 to slide. The external driving structure drives the driving rod 3 to reciprocate along the axial direction of the sliding compression block 2, so as to provide power for the work of the compressor.

The inner cavity of the stuffing box 4 is provided with a pressure oil cavity 42, the pressure oil cavity 42 is an annular cavity, the pressure oil cavity 42 is communicated with the guide hole 41, and the pressure oil cavity 42 is filled with lubricating oil all the time.

Preferably, the stuffing box 4 is provided with an isolation cavity 43 in the inner cavity, the isolation cavity 43 is an annular cavity, the isolation cavity 43 is communicated with the guide hole 41, the isolation cavity 43 is positioned between the pressure oil cavity 42 and the cylinder 1, and the isolation cavity 43 is communicated with the air inlet pipeline where the air inlet valve 11 is positioned.

Referring to fig. 1, an inner cavity of a packing box 4 is provided with three annular outer grooves which are annular cavities, the annular outer grooves are communicated with a guide hole 41, the number of the annular outer grooves is three along the axial direction of the packing box 4, an isolation cavity 43 and a pressure oil cavity 42 are respectively positioned between the two annular outer grooves, an annular outer groove is arranged between the isolation cavity 43 and the pressure oil cavity 42, a sealing ring 7 is embedded in the annular outer groove, the sealing ring 7 realizes the relative sealing between the inner cavity of a cylinder 1 and the isolation cavity 43, and the isolation cavity 43 and the pressure oil cavity 42. After the driving rod 3 is connected and assembled with the stuffing box 4, the pressure oil cavity 42 and the inner cavity of the cylinder 1 are relatively sealed with the outside atmosphere.

Preferably, the annular groove has been seted up to the 4 inner chambers of gland packing, and the annular groove is located the outer groove of annular and keeps away from the one end of cylinder 1, is provided with dust ring 8 in the annular groove, and dust ring 8 can be when actuating lever 3 moves towards the 2 directions of slip compression piece, clears away the impurity on the part surface that slides into 4 inner chambers of gland packing with actuating lever 3, reduces the wearing and tearing to sealing ring 7.

The compressor is lubricated by a method as follows, referring to fig. 1, a lubricating port 13 for feeding lubricating oil into an inner cavity of the cylinder 1 is fixedly arranged on the cylinder, and the lubricating oil sprayed from the lubricating port 13 can enter two ends of the sliding compression block 2 in the moving direction. In another embodiment, no valve is provided, and only a joint is provided, so that the lubricating oil can enter the inner cavity of the cylinder 1. In another embodiment, the number of the lubrication ports 13 is plural, and the plural lubrication ports 13 are uniformly distributed at intervals in the circumferential direction of the cylinder 1.

The stuffing box 4 is connected with a lubricating oil main pipe 44 communicated with the pressure oil chamber 42, the pressure oil chamber 42 is filled with lubricating oil, the lubricating oil main pipe 44 is communicated with the lubricating port 13 and feeds the lubricating oil to the lubricating port 13, the lubricating oil main pipe 44 is provided with a one-way valve, so that the lubricating oil can be fed into the lubricating port 13 only from the pressure oil chamber 42, and preferably, the lubricating oil main pipe 44 is provided with a throttle valve 45 for adjusting the flow rate of the lubricating oil fed into the lubricating port 13 from the pressure oil chamber 42.

The stuffing box 4 is connected with a lubricating oil tank 5 for feeding lubricating oil into the pressure oil chamber 42, the lubricating oil tank 5 is communicated with a lubricating oil supply pipe 55 for feeding lubricating oil into the pressure oil chamber 42, and the lubricating oil supply pipe 55 is provided with an electromagnetic valve for controlling the communication or closing of the lubricating oil supply pipe 55. In another embodiment, the lubricant supply pipe 55 is provided with a check valve so that the lubricant can be supplied only from the lubricant tank 5 into the pressure oil chamber 42.

The lubricating oil tank 5 is communicated with a lubricating oil vent pipe 52, the lubricating oil vent pipe 52 is communicated with a three-way valve 53, the three-way valve 53 is a pneumatic three-way valve, one valve port of the three-way valve 53 is communicated with the atmosphere, the other valve port of the three-way valve 53 is communicated with a lubricating oil high-pressure air inlet pipe 51, the three-way valve 53 can realize the communication between the lubricating oil vent pipe 52 and the atmosphere, and at the moment, the lubricating oil vent pipe 52 and the lubricating oil high-pressure air inlet; the three-way valve 53 can realize the communication between the lubricating oil vent pipe 52 and the lubricating oil high-pressure air inlet pipe 51, and at the moment, the lubricating oil vent pipe 52 is sealed and isolated from the atmosphere. The lubricating oil high-pressure air inlet pipe 51 is communicated with the exhaust valve 12, the exhaust valve 12 can supply air to the lubricating oil at high pressure, the lubricating oil high-pressure air inlet pipe 51 is communicated with the high-pressure air output pipe 121, and a small amount of high-pressure air in the high-pressure air output pipe 121 can enter the lubricating oil high-pressure air inlet pipe 51. The lube oil high pressure inlet pipe 51 is provided with a check valve, and fluid can only enter the lube oil breather pipe 52 from the lube oil high pressure inlet pipe 51 through the three-way valve 53.

Preferably, the high-pressure gas output pipe 121 is provided with a cooling and separating device 54, and the cooling and separating device 54 is located in the region between the connection of the high-pressure gas output pipe 121 and the lubricating oil high-pressure air inlet pipe 51 and the connection of the high-pressure gas output pipe 121 and the exhaust valve 12. The cooling and separating device 54 is used for cooling the output high-pressure gas, on one hand, oxygen in the high-temperature gas can be prevented from entering the lubricating oil tank 5 through the lubricating oil high-pressure air inlet pipe 51 to accelerate the oxidation of the lubricating oil, on the other hand, when water vapor exists in the high-pressure gas, the cooling and separating device 54 liquefies and discharges the water vapor, and liquid or gas water is reduced from entering the lubricating oil tank 5 to emulsify the lubricating oil.

In another embodiment, the lubricating oil high-pressure inlet pipe 51 is provided with a cooling and separating device 54.

Referring to fig. 1, a pressure pipeline is arranged on the three-way valve 53, a liquid level switch is arranged in the lubricating oil tank 5, the liquid level switch is a float switch and is used for controlling the opening and closing of the pressure pipeline, and the pressure pipeline applies pressure to the three-way valve 53 to control the communication between different valve ports of the three-way valve 53.

In another embodiment, a liquid level meter is disposed in the lubricating oil tank 5, and the liquid level meter is electrically connected with a controller, and the controller is electrically connected with the three-way valve 53 and controls the opening and closing of different valve ports of the three-way valve 53.

When the liquid level meter detects that the liquid level in the lubricating oil tank 5 is lower than the set liquid level, the controller controls the three-way valve 53 to correspond to the valve port, so that the atmosphere is communicated with the lubricating oil vent pipe 52, the lubricating oil high-pressure air inlet pipe 51 is separated from the lubricating oil vent pipe 52, and lubricating oil can be replenished into the lubricating oil tank 5 at the moment.

When the liquid level in the lubricating oil tank 5 is higher than the set liquid level, the controller controls the three-way valve 53 to correspond to the valve port, so that the atmosphere is separated from the lubricating oil vent pipe 52, the lubricating oil high-pressure air inlet pipe 51 is communicated with the lubricating oil vent pipe 52, and at the moment, the high-pressure air sent out by the exhaust valve 12 can be sent into the lubricating oil tank 5, so that the lubricating oil in the lubricating oil tank 5 is pressed into the pressure oil cavity 42, and the pressure oil cavity 42 is kept full of the lubricating oil with pressure.

The lubricating oil tank 5 is communicated with an oil supplementing pipe 61, the oil supplementing pipe 61 is communicated with a high-level oil tank 6 positioned above the lubricating oil tank 5, the oil supplementing pipe 61 is provided with a one-way valve to prevent lubricating oil in the lubricating oil tank 5 from reversely entering the high-level oil tank 6, when the lubricating oil tank 5 is communicated with the atmosphere, the lubricating oil in the high-level oil tank 6 is directly sent into the lubricating oil tank 5, and the height of the high-level oil tank 6 is higher than that of the pressure oil cavity 42. In another embodiment, the pressure of the lubricant in the high-level oil tank is greater than the atmospheric pressure, and the lubricant in the high-level oil tank can still enter the lubricant tank 5 after the lubricant tank 5 is communicated with the atmosphere.

Preferably, an oil storage groove 21 is formed in the side wall of the sliding compression block 2, the oil storage groove 21 is located between the two sealing rings 7, the oil storage groove 21 is communicated with the inner cavity of the cylinder 1, two ends of the oil storage groove 21 located on the sliding compression block 2 are relatively closed, lubricating oil is sprayed into the oil storage groove 21 when the oil storage groove 21 passes through the oil injection port 13 on the cylinder 1, and when the lubricating oil is not fed into the inner cavity of the cylinder 1 through the lubricating port 13, the lubricating oil stored in the oil storage groove 21 last time can lubricate the moving sliding compression block 2.

The implementation principle of the pump-free lubricating and sealing system of the reciprocating compressor in the embodiment of the application is as follows:

when the exhaust valve 12 outputs high-pressure gas, the high-pressure gas enters the lubricating oil tank 5, lubricating oil in the lubricating oil tank 5 is pressed into the pressure oil cavity 42, the lubricating oil filled in the pressure oil cavity 42 can lubricate the sliding between the driving rod 3 and the stuffing box 4, the high-pressure gas discharged by the exhaust valve 12 is used as a high-pressure gas source of the lubricating oil tank 5, the lubricating oil tank 5 in the lubricating oil tank 5 is pressed into the pressure oil cavity 42, an external pressure gas source or a plunger pump is avoided, the integral failure rate of equipment is reduced, pumpless lubrication is realized, and failure points are reduced for the equipment;

meanwhile, because the pressure in the pressure oil chamber 42 in the stuffing box 4 is always greater than the external atmospheric pressure, an isolation chamber 43 is arranged between the air cylinder 1 and the pressure oil chamber 42 of the stuffing box 4, the isolation chamber 43 is communicated with the air inlet, the internal pressure of the isolation chamber is always lower than the pressure in the pressure oil chamber 42, and the air cannot leak into the air cylinder 1 when the pressure in the air cylinder 1 is negative; meanwhile, when the pressure of the inner cavity of the cylinder 1 is overlarge, the high-temperature and high-pressure process gas enters the isolation cavity 43, and the lubricating oil in the isolation cavity is prevented from being oxidized and foamed due to the fact that the high-temperature and high-pressure process gas leaks into the filling pressure oil cavity 42 from the cylinder 1; the isolation and sealing of negative pressure in the air cylinder 1 are realized, and the application range of the compressor to different working conditions is expanded;

when the oil pressure in the pressure oil cavity 42 is smaller than the pressure of the inner cavity of the cylinder 1 where the lubricating port 13 is located, the lubricating port 13 stops sending high-pressure oil to the inner cavity of the cylinder 1;

at the initial stage of starting the compressor or when oil is replenished to the lubricating oil tank 5, the lubricating oil stored in the pressure oil chamber 42 can lubricate the drive rod 3 passing through the inside of the stuffing box 4, and the lubricating oil stored in the oil storage tank 21 in the previous stage can lubricate the sliding compression block 2 in motion.

The embodiment of the application also discloses a pump-free lubricating and sealing method of the reciprocating compressor. Referring to fig. 1, in a normal working state, the atmosphere port of the three-way valve 53 is closed, the other two ports are communicated, the exhaust pressure of the cylinder 1 acts on the upper part of the lubricating oil level in the lubricating oil tank 5 through the one-way valve and the three-way valve 53, the lubricating oil flows into the pressure oil chamber 42 of the stuffing box 4 through the one-way valve along a pipeline, and then the lubricating oil is sprayed into the cylinder 1 through the one-way valve after flow regulation is performed according to the requirement through the throttle valve 45. The power source is the pressure difference between the inlet and the outlet of the cylinder 1.

The injection process is illustrated in fig. 2 and 3, with the dual acting cylinder compression P-V diagram. The minimum inlet pressure Ps is designed to be smaller than the atmospheric pressure P0, taking into account valve losses, pipe losses, etc. at various locations. The pressure Pl of the lubricating oil at the oil injection point of the cylinder 1 is lower than the exhaust pressure Pd but higher than the atmospheric pressure P0. e is the middle point of the cylinder 1, a and c are respectively the no-rod side dead point and the rod side dead point of the sliding compression block 2, and when the sliding compression block 2 moves to a and c, the moving direction changes. Pl is oil injection point lubricating oil pressure; the oil injection point is the point where the lubrication port 13 is located.

The side of the sliding compression block 2 in the two sides of the inner cavity of the cylinder 1 along the axial direction is the compression side, and the side of the cylinder 1 sucking gas is the suction side. The compression-side intake valve 11 is closed, the exhaust valve 12 is opened, the suction-side intake valve 11 is opened, and the exhaust valve 12 is closed.

Referring to fig. 2, in the high pressure ratio working condition, lubricating oil is sprayed into the whole process of reciprocating motion of the sliding compression block 2: a → e on the compression side and e → c on the suction side. When the part a → e moves, the lubricating port 13 is positioned on the compression side, and the pressure of the inner cavity of the lubricating oil tank 5 is higher than that of the inner cavity on the compression side, so that the lubricating port 13 can spray lubricating oil; when the part e → c moves, the lubrication port 13 is located on the suction side, and the pressure in the cavity of the lubricating oil tank 5 is higher than the pressure in the cavity on the suction side, so that the lubrication port 13 can eject the lubricating oil.

Referring to fig. 3, in the low pressure ratio working condition, point a → point b, point b is the cylinder 1 position corresponding to the intersection point of Pl and the air pressure at the compression side, and the lubricating oil is sprayed at the compression side; b → e, because the oil injection point is still positioned at the compression side and the pressure in the cylinder is higher than the oil pressure Pl of the oil injection point, the system does not inject oil; e → c, the oil injection point enters the air suction side, and oil injection is started until the sliding compression block 2 runs to the rod side dead center c.

The return stroke of the sliding compression block 2 is similar to the return stroke, point c → point d, point d is the position of the cylinder 1 corresponding to the intersection point of Pl and the air pressure of the compression side in the return stroke, and lubricating oil is sprayed on the compression side; d → e, because the oil injection point is still positioned at the compression side and the pressure in the cylinder is higher than the oil pressure Pl of the oil injection point, the system does not inject oil; e → a, the oil injection point enters the air suction side, and oil injection is started until the sliding compression block 2 runs to the no-rod side dead point a. The check valve on the lube main 44 prevents process gas from entering the lube line during periods when the system is not injecting.

The smaller the working pressure ratio of the compressor is, the smaller the pressure difference is, the shorter the oil injection time of the system is, the smaller the pressure difference is, and the smaller the oil injection flow is; the injected fuel quantity is equal to the product of the injection time and the injection flow rate, so that the smaller the injected fuel quantity is. At the initial stage of starting the compressor, the pressure ratio is close to 1, the system does not spray oil in the whole running process of the sliding compression block 2, and the lubrication of the part is provided by the lubricating oil stored in the pressure oil cavity 42 and the oil storage groove 21 until the pressure difference is built up.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A pump-free lubricating and sealing system of a reciprocating compressor comprises a cylinder (1), wherein a sliding compression block (2) is connected in the cylinder (1) in a sealing and sliding manner, a driving rod (3) is fixedly connected to the sliding compression block (2), the driving rod (3) extends out of the cylinder (1), the driving rod (3) can keep the relative sealing between the inner cavity of the cylinder (1) and the atmosphere when sliding, a stuffing box (4) for guiding the driving rod (3) to move is sleeved on the outer side of the driving rod (3), the stuffing box (4) is fixedly connected with the cylinder (1), a hole for accommodating the driving rod (3) to penetrate through on the stuffing box (4) is a guide hole (41), the guide hole (41) is communicated with the inner cavity of the cylinder (1), and the stuffing box (4) and the cylinder (1) are relatively stable; cylinder (1) both ends all set firmly admission valve (11) rather than the inner chamber intercommunication, cylinder (1) both ends all set firmly discharge valve (12) rather than the inner chamber intercommunication, set firmly lubricating mouth (13) to sending into lubricating oil to its inner chamber on cylinder (1), lubricating mouth (13) spun lubricating oil can get into the both ends of slip compression piece (2) moving direction, its characterized in that: the inner cavity of the stuffing box (4) is provided with an isolation cavity (43) and a pressure oil cavity (42) which are communicated with the guide hole (41), and the isolation cavity (43) is positioned between the pressure oil cavity (42) and the cylinder (1); the isolation cavity (43) is communicated with an air inlet pipeline where the air inlet valve (11) is located;

after the driving rod (3) is connected with the stuffing box (4), the isolation cavity (43) and the pressure oil cavity (42) are relatively sealed with the outside atmosphere, and a lubricating oil tank (5) for feeding lubricating oil into the pressure oil cavity (42) is connected to the stuffing box (4);

a lubricating oil main pipe (44) which is used for communicating the pressure oil chamber (42) with the lubricating port (13) is arranged between the pressure oil chamber (42) and the lubricating port (13), and the lubricating oil main pipe (44) can only convey lubricating oil to the lubricating port (13) in a one-way mode;

and the lubricating oil tank (5) is communicated with a lubricating oil high-pressure air inlet pipe (51), and the lubricating oil high-pressure air inlet pipe (51) is communicated with an air outlet pipeline where the exhaust valve (12) is located.

2. The reciprocating compressor pumpless lubrication sealing system of claim 1, wherein: and a throttle valve (45) and a one-way valve are arranged on the lubricating oil main pipe (44).

3. The reciprocating compressor pumpless lubrication sealing system of claim 1, wherein: oil storage tank (21) have been seted up to slip compression piece (2) lateral wall, slip compression piece (2) lateral wall has set firmly two sealing rings (7), and two sealing rings (7) are located oil storage tank (21) along slip compression piece (2) slip direction both ends.

4. The reciprocating compressor pumpless lubrication sealing system of claim 1, wherein: an oil supplementing system is arranged on the lubricating oil tank (5), the oil supplementing system comprises a high-level oil tank (6), an oil supplementing pipe (61) is arranged between the high-level oil tank (6) and the lubricating oil tank (5), and lubricating oil is fed into the lubricating oil tank (5) from the high-level oil tank (6) through the oil supplementing pipe (61).

5. The reciprocating compressor pumpless lubrication sealing system of claim 4, wherein: the high-level oil tank (6) is communicated with the atmosphere, and a one-way valve is arranged on the oil supplementing pipe (61);

the lubricating oil tank (5) is communicated with a lubricating oil vent pipe (52), the lubricating oil vent pipe (52) is communicated with a three-way valve (53), one valve port of the three-way valve (53) is communicated with the atmosphere, and the other valve port of the three-way valve (53) is communicated with a lubricating oil high-pressure air inlet pipe (51).

6. The reciprocating compressor pumpless lubrication sealing system of claim 1, wherein: and the lubricating oil high-pressure air inlet pipe (51) is communicated with a cooling separation device (54).

7. The reciprocating compressor pumpless lubrication sealing system of claim 1, wherein: the outer side of the sliding compression block (2) is fixedly provided with two support rings (22), and the two support rings (22) are arranged at intervals along the sliding direction of the support rings;

a sealing ring (7) is fixedly arranged on the outer side of the sliding compression block (2);

two sealing rings (7) which are positioned at two ends of the pressure oil cavity (42) along the sliding direction of the driving rod (3) are fixedly arranged on the inner side of the stuffing box (4); and the stuffing box (4) is connected with a dustproof ring (8).

8. A method for lubricating and sealing a reciprocating compressor without a pump is characterized in that: the air cylinder comprises an air cylinder (1), wherein a sliding compression block (2) is connected in the air cylinder (1) in a sealing and sliding manner, a driving rod (3) is fixedly connected to the sliding compression block (2), the driving rod (3) extends out of the air cylinder (1), and the driving rod (3) can keep the relative sealing between the inner cavity of the air cylinder (1) and the atmosphere when sliding; an air inlet valve (11) communicated with the inner cavity of the air cylinder (1) is fixedly arranged at each of two ends of the air cylinder (1), an air outlet valve (12) communicated with the inner cavity of the air cylinder (1) is fixedly arranged at each of two ends of the air cylinder (1), a lubricating port (13) for feeding lubricating oil into the inner cavity of the air cylinder (1) is fixedly arranged on the air cylinder (1), and the lubricating port (13) is positioned in the middle area of the air cylinder (1) in the length direction;

the minimum air inlet pressure Ps of the cylinder (1) is less than the atmospheric pressure P0, and the pressure loss of pipelines and valves at each position is taken into account; the pressure Pl of the lubricating oil at the oil injection point of the cylinder (1) is less than the exhaust pressure Pd and is greater than the atmospheric pressure P0; e is the middle point of the cylinder (1), a and c are respectively the no-rod side dead point and the rod side dead point of the sliding compression block (2) when moving, and at the moment, the moving direction of the sliding compression block (2) changes when moving to a and c; pl is oil injection point lubricating oil pressure; the oil spraying point is the point of the lubricating port (13); the side of the sliding compression block (2) in the inner cavity of the cylinder (1) along the axial direction of the sliding compression block (2) for compressing gas is a compression side, and the side of the cylinder (1) for sucking gas is a suction side;

when the compression ratio is larger, when the sliding compression block (2) moves at a → e, the pressure on the compression side is smaller than the exhaust pressure and smaller than the oil pressure of lubricating oil at the oil injection point;

when the sliding compression block (2) moves at a → e position, pressure is applied to lubricating oil in the lubricating port (13), and the pressure of an oil injection point is larger than the pressure of the compression side of the inner cavity of the cylinder (1); when the sliding compression block (2) e → c moves, pressure is applied to lubricating oil in the lubricating port (13), so that the pressure of an oil injection point is greater than the pressure of the air suction side of the inner cavity of the cylinder (1), and the lubricating oil can be sprayed out from the oil injection point;

when the compression ratio is small, when the sliding compression block (2) moves at a → e, the pressure at the compression side is smaller than the exhaust pressure and gradually changes to be equal to or larger than the oil pressure of lubricating oil at an oil injection point, and at the moment, a point b exists, wherein the point b is the position of the cylinder (1) corresponding to the intersection point of the Pl and the air pressure at the compression side;

point a → b, lubricating oil is sprayed on the compression side; b → e, because the oil injection point is still positioned at the compression side and the pressure in the cylinder is higher than the oil pressure Pl of the oil injection point, the system does not inject oil; e → c, the oil injection point enters the air suction side, and oil injection is started until the sliding compression block (2) runs to the rod side dead center c.

9. The method of claim 8, wherein the method comprises the steps of: the air outlet pressure of the exhaust valve (12) provides pressure for lubricating oil in the inner cavity of the lubricating port (13).

10. The method of claim 8, wherein the method comprises the steps of: oil storage tank (21) have been seted up to slip compression piece (2) lateral wall, oil storage tank (21) and cylinder (1) inner chamber intercommunication, and the both ends that are located slip compression piece (2) are sealed relatively.