CN-121429585-B - Multistage circulating energy-saving BOG compressor unit

CN121429585BCN 121429585 BCN121429585 BCN 121429585BCN-121429585-B

Abstract

The invention relates to the technical field of compressors, in particular to an energy-saving BOG compressor unit with multi-stage circulation, which comprises an air valve, wherein the air valve comprises a valve seat, a lift limiting plate, a valve plate, a spring assembly and a sealing gasket, a first air channel is formed in the valve seat, the valve plate is arranged between the lift limiting plate and the valve seat, the side surface of the valve plate, which faces the valve seat, is a sealing surface, a second air channel is further formed in the valve plate, the spring assembly is arranged between the lift limiting plate and the valve plate and is used for driving the valve plate to move in the direction close to the valve seat, the sealing gasket is arranged on the sealing surface, is annular and corresponds to the first air channel up and down, the cross section of the sealing gasket in the radial direction of the sealing gasket is arc-shaped, so that an arc-shaped guiding surface is formed, and when the valve plate moves in the direction far away from the valve seat, the arc-shaped guiding surface can guide air from the first air channel to enter the second air channel, so that impact of the air on the sealing surface of the valve plate is reduced, and the service life of the air valve is prolonged.

Inventors

YU MIN
OUYANG SHUN
Feng Chennan

Assignees

浙江强盛压缩机制造有限公司

Dates

Publication Date: 20260505
Application Date: 20260104

Claims (7)

1. The utility model provides an energy-conserving BOG compressor unit of multistage circulation, includes the piston cylinder, be connected with the pneumatic valve on the piston cylinder, its characterized in that, the pneumatic valve includes: the valve seat is provided with a first gas channel; the lift limiting plate and the axis of the valve seat extend in the vertical direction, and the lift limiting plate is positioned below the valve seat and is close to the piston cylinder; the axial line of the valve plate extends along the up-down direction, the valve plate is positioned between the lift limiting plate and the valve seat and can slide up and down between the lift limiting plate and the valve seat, the side surface of the valve plate facing the valve seat is a sealing surface used for opening or blocking the first gas channel, the valve plate is also provided with a second gas channel, and the second gas channel and the first gas channel are staggered in the up-down direction; The spring assembly is positioned between the lift limiting plate and the valve plate and is used for driving the valve plate to move towards the direction close to the valve seat, so that the sealing surface can block the first gas channel; the sealing gasket is positioned on the sealing surface, is annular and corresponds to the first gas channel up and down, and has an arc-shaped cross section along the radial direction of the sealing gasket so as to form an arc-shaped guide surface; a plurality of sector areas are uniformly distributed on the valve seat, the valve plate and the lift limiting plate around the circumferential direction, and each sector area is provided with a plurality of arc long holes distributed along the radial direction of the sector area; A rotating structure is arranged between the valve plate and the valve seat, and each time the valve plate is downward far away from the valve seat and opens the first gas channel, the rotating structure can enable the valve plate to rotate around the axis of the valve seat by a set angle relative to the valve seat, so that the contact position between the second spring and the valve plate is changed; the rotary structure comprises a saw tooth ring and a plurality of rotary saw teeth, wherein the saw tooth ring is coaxially arranged on the outer peripheral surface of the valve seat, the saw tooth ring comprises a plurality of saw tooth grooves which are annularly distributed, each rotary saw tooth is rotatably arranged on the outer peripheral surface of the valve plate through a rotary shaft, the rotary shaft extends along the radial direction of the valve plate, each rotary shaft is provided with a torsion spring, and in an initial state, the pretightening force of the torsion spring enables the rotary saw teeth to be clamped into the saw tooth grooves; the rotating saw tooth is provided with a first guide inclined surface inclined relative to the up-down direction, and the saw tooth groove is provided with a second guide inclined surface inclined relative to the up-down direction; The valve further comprises a driving shaft, the driving shaft extends along the up-down direction, the lower end of the driving shaft is fixedly connected with the lift limiting plate, the valve seat is coaxially sleeved on the driving shaft, a convex column eccentrically arranged relative to the axis of the driving shaft is arranged on the driving shaft, the valve plate is coaxially sleeved on the convex column in a sliding mode, and the lift limiting plate and the valve plate are coaxially arranged, so that the contact position of the sealing surface and the valve seat can be switched when the valve plate rotates around the convex column.
2. The multi-stage circulating energy-saving BOG compressor unit of claim 1, wherein the air valve further comprises a pressing fork and a plurality of damping pieces, the pressing fork is positioned above the valve seat, the pressing fork is provided with a plurality of downward extending inserting rods, each damping piece is arranged between the valve plate and the sealing gasket in the up-down direction and can stretch out and draw back in the up-down direction, the inserting rods are in one-to-one correspondence with the damping pieces in the up-down direction, and when the inserting rods are inserted into the first air passage downwards and are pressed against the damping pieces, the damping pieces are compressed and drive the sealing gasket to radially deform so as to enlarge the coverage area of the sealing gasket on the sealing surface, and meanwhile, the valve plate is pushed to move away from the valve seat against the elastic force of the spring assembly.
3. The multistage circulating energy-saving BOG compressor unit of claim 2, wherein the damping piece comprises a damping cylinder and a damping rod, the damping cylinder is fixedly arranged on the valve plate, hydraulic oil is filled in the damping cylinder, the upper end of the damping rod is in blocking fit with the lower end of the inserted rod, a piston is arranged at the lower end of the damping rod, the interior of the damping cylinder is divided into an upper damping cavity and a lower damping cavity by the piston, a unidirectional circulation structure is arranged between the upper damping cavity and the lower damping cavity, the unidirectional circulation structure enables the resistance of the hydraulic oil flowing from the lower damping cavity to the upper damping cavity to be smaller than the resistance of the hydraulic oil flowing from the upper damping cavity to the lower damping cavity, a first spring is arranged in the lower damping cavity, and the first spring exerts upward acting force on the piston.
4. The multi-stage circulating energy-saving BOG compressor unit according to claim 3, wherein the lower end of each inserted link is provided with an arc-shaped groove, the upper end of each damping link is provided with an arc-shaped surface, and the arc-shaped grooves and the arc-shaped surfaces correspond to the upper side and the lower side of the sealing gasket respectively.
5. The multi-stage circulating energy-saving BOG compressor unit of claim 4, wherein the spring assembly comprises a plurality of second springs and a plurality of hydraulic telescopic rods, the hydraulic telescopic rods are fixed on the upper side surfaces of the lift limiting plates and extend in the up-down direction, the second springs are in one-to-one correspondence with the hydraulic telescopic rods and sleeved on the corresponding hydraulic telescopic rods, and the upper ends of the second springs are in sliding abutting connection with the lower side surfaces of the valve plates, so that the valve plates have a tendency to be close to valve seats.
6. The multi-stage circulating energy-saving BOG compressor unit of claim 5, wherein when the valve plate moves in a direction away from the valve seat, under the interaction of the first guide inclined surface and the second guide inclined surface, the rotating saw teeth can overcome the pretightening force of the torsion spring to rotate around the rotating shaft and push the valve plate to rotate around the axis by a set angle, so that the end parts of the rotating saw teeth can correspond to the next adjacent saw tooth grooves, and when the valve plate is upwards close to the valve seat and seals the first gas passage, the rotating saw teeth recover to an initial state under the action of the torsion spring, so that the rotating saw teeth can be clamped into the next adjacent saw tooth grooves.
7. The multistage circulating energy-saving BOG compressor unit of claim 2, wherein a sleeve is fixedly arranged on the pressure fork, the sleeve is coaxially sleeved outside the driving shaft, a connector is connected to the sleeve in a threaded manner and is used for being connected with a driving mechanism, and the driving mechanism is used for driving the pressure fork to move downwards.

Description

Multistage circulating energy-saving BOG compressor unit Technical Field The invention relates to the technical field of compressors, in particular to a multistage circulating energy-saving BOG compressor unit. Background The core function of the BOG compressor (boil-off gas compressor) is to boost the boil-off gas generated by the storage tank to meet the pressure requirements of the downstream pipe network or the reliquefaction device. Such compressors are reciprocating compressors, which are typically provided with a gas valve inside. The patent document with the publication number of CN202851303U discloses an air inlet valve of a gas compressor, the air inlet valve comprises a valve seat and a lift limiter, a valve plate is arranged between the valve seat and the lift limiter, a spring connected with the valve plate is arranged on the lift limiter, a stud is connected to the lift limiter, a sleeve is sleeved on the upper portion of the stud, a guide bushing is sleeved on the outer side of the sleeve, a support sleeve is sleeved on the outer side of the guide bushing, and an unloading device is connected to the outer side of the support sleeve. The unloader is used for pushing the valve plate away from the valve seat and compressing the spring, and the spring enables the valve plate to reset so as to be in sealing contact with the valve seat. Due to the frequent pumping and exhausting function of the compressor piston cylinder, the valve plate and the valve seat of the air valve can be impacted frequently, the sealing surfaces of the valve plate and the valve seat are easy to wear, the service life of the air valve is influenced, and the service life of the multistage circulating energy-saving BOG compressor unit is further influenced. Disclosure of Invention Based on the above, it is necessary to provide a multistage circulation energy-saving BOG compressor unit aiming at the technical problem that the service life is influenced by the abrasion of a sealing surface between a valve plate and a valve seat in the prior air valve. The above purpose is achieved by the following technical scheme: The multistage circulating energy-saving BOG compressor unit comprises a piston cylinder, wherein the piston cylinder is connected with an air valve, the air valve comprises a valve seat, a lift limiting plate, a valve plate, a spring assembly and a sealing gasket, the valve seat is provided with a first air channel, the lift limiting plate and the axis of the valve seat extend along the up-down direction, the lift limiting plate is positioned below the valve seat and is close to the piston cylinder, the axis of the valve plate extends along the up-down direction, the valve plate is positioned between the lift limiting plate and the valve seat and can slide up and down between the lift limiting plate and the valve seat, the side surface of the valve plate, facing the valve seat, is a sealing surface, the sealing surface is used for opening or blocking the first air channel, a second air channel is further arranged on the valve plate, the second air channel and the first air channel are staggered in the up-down direction, the spring assembly is positioned between the lift limiting plate and the valve plate and is used for driving the valve plate to move towards the direction close to the valve seat, so that the first air channel can be blocked, the sealing gasket is positioned on the sealing surface, the sealing gasket is annular and corresponds up-down to the first air channel, the sealing surface is positioned on the sealing surface, the sealing gasket can slide up-down along the upper and down direction, the sealing surface and the sealing surface is radial to the sealing gasket, when the sealing gasket is far from the first air channel and the arc-shaped air channel, and the sealing surface is far from the arc-shaped, and the first air channel is formed by the arc-shaped, and the sealing surface and the channel can move along the arc-shaped channel. The valve is characterized by further comprising a pressing fork and a plurality of damping pieces, wherein the pressing fork is positioned above the valve seat, the pressing fork is provided with a plurality of downward extending inserting rods, each damping piece is arranged between the valve plate and the sealing gasket in the up-down direction and can stretch out and draw back in the up-down direction, the inserting rods are in one-to-one correspondence with the damping pieces in the up-down direction, when the inserting rods are downwards inserted into the first gas channel and are pressed against the damping pieces, the damping pieces are compressed and drive the sealing gasket to radially deform so as to enlarge the coverage area of the sealing gasket on the sealing surface, and meanwhile, the valve plate is pushed to move away from the valve seat in the direction of overcoming the elastic acting force of the spring assembly. Further, the damping piece comprises