CN112145427A

CN112145427A - Integrated mechanical seal for process screw compressor

Info

Publication number: CN112145427A
Application number: CN202010933065.7A
Authority: CN
Inventors: 曹云鹏; 关键; 胡益军; 邹豪; 都森欣; 陆晶妮; 裘明权; 蔡昌莎
Original assignee: Lopland Machinery & Equipment Ningbo Co ltd
Current assignee: Lopland Machinery & Equipment Ningbo Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2020-12-29
Anticipated expiration: 2040-09-08
Also published as: CN112145427B

Abstract

The invention discloses a cartridge mechanical seal for a process screw compressor, which comprises a seal cavity and a shaft sleeve penetrating through the inner cavity of the seal cavity, wherein a main seal and an auxiliary seal are respectively arranged between the outside of the shaft sleeve and the inside of the seal cavity, the main seal and the auxiliary seal are arranged on two sides of the seal cavity in a back-to-back manner along the axial direction, and the shaft sleeve, the seal cavity, the main seal and the auxiliary seal are integrated into an integrated structure; one side of the seal cavity body close to the main seal is also provided with an accommodating cavity, and a lip seal assembly is arranged between the opening end of the accommodating cavity and the outer side wall of the mounting boss at one end of the shaft sleeve, so that the accommodating cavity forms a first seal cavity for preventing the process gas compressed in the process compressor from entering the working seal cavity of the mechanical seal. The integrated mechanical seal for the process screw compressor disclosed by the invention can better adapt to the working condition of the process screw compressor, and has more stable sealing performance and long service life.

Description

Integrated mechanical seal for process screw compressor

Technical Field

The invention relates to the technical field of mechanical seal, in particular to a cartridge mechanical seal for a process screw compressor.

Background

The excellent versatility of screw compressors, both centrifugal and piston compressors, while avoiding their disadvantages, makes them well suited for use throughout the world from very small chemical processes to large-scale plants. Therefore, the process screw compressor is preferred in many operations and processes in the chemical and petrochemical industries, while the oil-injected twin-screw compressor has the advantages of high reliability, low running cost and the like, and is a compression device ideal for process gases and applications.

As most of the gas compressed by the process screw compressor is process gas which may contain poisonous, harmful, inflammable, explosive and corrosive gas, the compression cavity must be isolated from the atmosphere and the bearing must be sealed by shaft.

The shaft seal commonly used for the process screw compressor comprises a packing seal, a labyrinth seal and a mechanical seal, and the mechanical seal is divided into a wet contact type mechanical seal and a dry non-contact type mechanical seal.

The common shaft seal forms of the technical screw compressor are as follows:

1. and (3) packing and sealing: although the screw compressor has the advantages of simple structure, maintenance and low cost, the screw compressor has the defects of short service life, large leakage amount, easy abrasion and the like, and can not meet the sealing use requirement of the screw compressor in the prior art. This more primitive form of shaft seal has been eliminated in mainstream process screw compressors.

2. Labyrinth sealing: the labyrinth seal has the advantages of simple structure and low cost, but also has the defects of short service life, large leakage amount (which is gradually increased along with the service time) and high energy consumption (which needs to continuously feed the isolating gas), and under the increasingly strict environmental protection requirement and energy-saving requirement, the labyrinth seal is difficult to meet the higher use requirement of the process screw compressor, the use ratio of the labyrinth seal is gradually reduced, and the labyrinth seal reaches a lower use level at present.

3. Mechanical sealing: the mechanical seal has the advantages of small leakage amount, long service life, energy conservation, environmental protection, simple maintenance and the like, but has the defects of relatively complex structure, higher part cost, higher requirement on installation technology, lack of targeted design and the like, but has very small leakage amount and smaller shaft power consumption compared with other shaft seals, just meets the requirements of energy conservation and environmental protection of the whole society at present, and the mechanical seal has become a main shaft seal mode of a process screw compressor. Mechanical seals can be classified according to the operating principle:

3.1, the dry non-contact mechanical seal has the advantages that the end surfaces are not contacted during operation, no abrasion is caused, the service life is long, the leakage amount is small, the defects that the isolating gas is continuously consumed, the energy consumption is high, a corresponding expensive auxiliary system is required to be matched, the sealing cost is very high, and the use performance and the cost are low.

3.2, wet contact type mechanical seal: the advantages are stable sealing performance, small leakage, mature technology and relatively simple matching equipment. The defect is that the theoretical service life is shorter than that of dry gas sealing, but is far better than that of other forms of shaft seals, and the shaft seal is an ideal shaft seal scheme of the process screw compressor. However, the working condition of the process screw compressor belongs to a gas-liquid mixed state, and the application of the wet contact type mechanical seal in the process screw compressor is restricted by the problems of easy dry friction, excessive abrasion, serious heating and the like of the mechanical seal.

Disclosure of Invention

The invention aims to solve the technical problems that: the integrated mechanical seal for the process screw compressor can better adapt to the working condition of the process screw compressor, has more stable sealing performance and long service life.

The invention adopts a technical scheme that: the integrated mechanical seal for the process screw compressor comprises a shaft sleeve and a seal cavity, wherein the shaft sleeve is arranged in the seal cavity in a penetrating mode, a driving ring assembly, a main static ring assembly, an auxiliary static ring assembly and an auxiliary moving ring assembly are sleeved outside the shaft sleeve, a first mounting groove is formed in one end of the inner side of the seal cavity, the tail end of the main static ring assembly is assembled in the first mounting groove in a sealing mode, the ground end of the main static ring assembly is attached to the ground end of the driving ring assembly to form a main seal ground surface, and the tail end of the driving ring assembly is assembled on a mounting boss at one end of the shaft sleeve in a sealing mode; the other end of the inner side of the sealed cavity is provided with a second assembling groove, the tail end of the auxiliary static ring assembly is assembled in the second assembling groove in a sealing mode, the grinding surface end of the auxiliary static ring assembly is attached to the grinding surface of the auxiliary moving ring assembly to form an auxiliary sealed grinding surface, and the auxiliary moving ring assembly is positioned and sleeved at the other end of the shaft sleeve, so that the shaft sleeve, the sealed cavity, the driving ring assembly, the main static ring assembly, the auxiliary static ring assembly and the auxiliary moving ring assembly are integrated into an integrated structure; one side of the sealing cavity body close to the first mounting groove is further provided with a holding cavity, and a lip seal assembly is arranged between the opening end of the holding cavity and the outer side wall of the mounting boss, so that the holding cavity forms the first sealing cavity.

After adopting the structure, compared with the prior art, the invention has the following advantages:

in the mechanical sealing structure, the static ring compensation components of the main seal and the auxiliary seal are designed and arranged in a back-to-back mode on the sealing cavity 2. The sealing space can be effectively saved, the sealing structure is simplified, and the defects that the rotary mechanical seal is greatly influenced by vibration, linear rotating speed, cavitation and evacuation in the working condition of the process screw compressor are overcome, so that the sealing stability of the mechanical seal is ensured, and the service life is prolonged.

In addition, the invention adopts an original isolated seal cavity type structure, the lip seal assembly with a special structure forms an independent first seal cavity in the whole mechanical seal structure between the accommodating cavity and the mounting boss of the shaft sleeve, and the seal working direction of the lip seal assembly prevents compressed process gas in the process compressor from entering the seal cavity, so that the phenomenon that the gas enters a mechanical seal grinding surface to form dry friction is prevented, the cavitation phenomenon is avoided, the seal stability is further ensured, and the service life of the mechanical seal is prolonged.

Furthermore, the driving ring assembly comprises a first moving ring and a first moving ring seat, wherein a moving ring groove is formed in one end, far away from the moving grinding surface, of the first moving ring seat, and the first moving ring is assembled in the moving ring groove in a sealing mode; the side wall of the other end of the first movable ring seat is provided with a plurality of transmission screws which are distributed along the circumferential direction in a penetrating mode, and the end portions of the plurality of transmission screws are tightly fixed on the side wall of the shaft sleeve.

Still further, the main stationary ring assembly comprises a first stationary ring and a first stationary ring seat, wherein a first stationary ring groove is formed in one end of the first stationary ring seat, and one end, far away from the stationary grinding surface, of the first stationary ring is assembled in the first stationary ring groove in a sliding and sealing manner; the other end of the first stationary ring seat is assembled in the first mounting groove.

As an improvement, a gasket is arranged between the bottom of the first mounting groove and the tail end of the main static ring assembly; one end of the gasket is abutted against the tail end of the first static ring, the other end of the gasket is provided with a first connecting screw, one end of the first static ring seat, which is far away from the first static ring groove, is provided with a countersunk through hole communicated with the first static ring groove, and the head of the first connecting screw is matched in the countersunk through hole; and a plurality of springs are arranged between the tail end of the first static ring and the bottom of the first mounting groove along the circumferential direction.

And the tail end of the first stationary ring is provided with a first anti-rotation pin hole matched with the first anti-rotation pin.

Still further, the auxiliary stationary ring assembly comprises a second stationary ring and a second stationary ring seat; one end of the second static ring seat is matched in the second mounting groove, the other end of the second static ring seat is provided with a second static ring groove, one end, far away from the static grinding surface, of the second static ring is assembled in the second static ring groove in a sliding and sealing mode, and a compensation element is arranged between the tail end of the second static ring and the bottom of the second static ring groove.

Preferably, the compensating element is a wave spring, the bottom of the second stationary ring groove is provided with an accommodating groove, one end of the wave spring is matched in the accommodating groove, and the other end of the wave spring abuts against the tail end of the second stationary ring.

Furthermore, the auxiliary rotating ring assembly comprises a second rotating ring and a second rotating ring seat, the second rotating ring seat is sleeved at one end, far away from the mounting boss, of the shaft sleeve, a plurality of driving screws are arranged on the side wall of the second rotating ring seat along the circumferential direction, and the end parts of the plurality of driving screws penetrate through the side wall of the shaft sleeve and are fixedly connected to the rotating shaft; and a movable ring mounting boss used for assembling a second movable ring is arranged at one end of the second movable ring seat close to the auxiliary stationary ring component.

As an improvement, the side wall of the second movable ring seat is also provided with a plurality of second connecting screws, and the front end parts of the second connecting screws are provided with limiting convex columns; the side wall of the shaft sleeve is provided with a step counter bore, and the limiting convex column of the second connecting screw is matched in the step counter bore so as to realize the positioning connection of the second movable ring seat and the shaft sleeve.

In a further improvement, a first flushing hole communicated with the first sealing cavity is formed in the side wall of the sealing cavity; and a second sealing cavity is formed between the driving ring assembly, the main static ring assembly, the auxiliary moving ring assembly, the auxiliary static ring assembly and the outer side of the shaft sleeve, and a second flushing hole communicated with the second sealing cavity is further formed in the side wall of the sealing cavity. A first flushing hole is formed in the sealed cavity, and the first oil inlet hole specifically comprises a plurality of oil inlet holes and at least one oil outlet hole, so that the circulation of flushing oil is ensured; meanwhile, the oil outlet is connected to the screw rotor cavity, so that the functions of a heat dissipation screw and a lubricating screw are achieved, and the working condition of the process screw compressor is better adapted.

The specific advantages of the improved mechanism described above are set forth in the detailed description that follows.

Drawings

FIG. 1 is a cross-sectional view of a cartridge type mechanical seal for a process screw compressor of the present invention.

Fig. 2 is another angular cross-sectional view of a cartridge-type mechanical seal for a process screw compressor of the present invention.

Fig. 3 is a perspective view of a cartridge type mechanical seal for a process screw compressor of the present invention.

Fig. 4 is a connection structure diagram of the first stationary ring seat, the stationary ring washer, and the spring according to the present invention.

Fig. 5 is another angle diagram of the connection structure of the first stationary ring seat, the stationary ring gasket and the spring according to the present invention.

Fig. 6 is an enlarged structural view at X in fig. 2.

Fig. 7 is a structural view of a first movable ring mount in the present invention.

Wherein, 100-the first sealed cavity and 110-the second sealed cavity; 01-a driving ring component, 02-a main static ring component, 03-an auxiliary static ring component, 04-an auxiliary dynamic ring component and 05-a lip seal component;

1-shaft sleeve, 1.1-step counter bore, 2-seal cavity, 2.1-first mounting groove, 2.2-second mounting groove, 3-mounting boss, 4-first rotating ring, 5-first rotating ring seat, 5.1-rotating ring groove, 5.2-driving lug, 6-driving screw, 7-first stationary ring, 8-first stationary ring seat, 8.1-first stationary ring groove, 8.2-second anti-rotation pin hole, 8.3-countersunk head through hole, 8.4-communicating hole, 9-first anti-rotation pin, 10-gasket, 11-first connecting screw, 12-spring, 13-second stationary ring, 14-second stationary ring seat, 14.1-second stationary ring groove, 14.2-accommodating groove, 15-compensating element, 16-second rotating ring, 17-second rotating ring seat, 17.1-a movable ring mounting boss, 17.2-a limiting protrusion, 18-a driving screw, 19-a second connecting screw, 19.1-a limiting convex column, 20-a lip seal, 21-a clamp spring, 22-a second anti-rotation pin, 23-a third anti-rotation pin, 24-a fastening bolt, 25-a driving pin, 26-a limiting block and 26.1-a limiting clamping groove.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

In the description of the present invention, it should be noted that the terms "outside", "trailing end", "outside", "bottom", "leading end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" in the description are used for convenience of distinction and understanding only, and do not have a specific meaning or definition. The tail end refers to an end away from the friction surface, for example, the tail end of the movable ring refers to an end of the movable ring away from the friction surface. The front end portion refers to the end of the screw facing away from the head of the screw.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "fitted" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2 and 3, the container type mechanical seal for a process screw compressor provided by the invention comprises a shaft sleeve 1 and a seal cavity 2, specifically, the shaft sleeve 1 and the seal cavity 2 are made of stainless steel, the shaft sleeve 1 is arranged at the axial middle position of the seal cavity 2 in a penetrating manner, and the shaft sleeve 1 and the seal cavity are connected and positioned through a corresponding mechanical seal structure.

Specifically, a driving ring component 01, a driving static ring component 02, an auxiliary static ring component 03 and an auxiliary moving ring component 04 are sleeved outside the shaft sleeve 1; wherein, the grinding surface end of the driving ring component 01 and the main static ring component 02 is jointed to form a main seal, and the grinding surface end of the auxiliary moving ring component 04 and the auxiliary static ring component 03 are jointed to form an auxiliary seal.

More specifically, a first mounting groove 2.1 is arranged at one end of the inner side of the sealed cavity 2, the tail end of the main static ring component 02 is hermetically assembled in the first mounting groove 2.1, and the grinding surface end of the main static ring component 02 is attached to the grinding surface end of the driving ring component 01 to form a main sealing grinding surface; the tail end of the driving ring component 01 is hermetically assembled on the mounting boss 3 at one end of the shaft sleeve 1; the other end of seal chamber 2 inboard is equipped with second and joins in marriage mounting groove 2.2, the sealed dress of joining in marriage of tail end of vice quiet ring subassembly 03 is in second mounting groove 2.2, the mill flour end of vice quiet ring subassembly 03 is laminated mutually with the mill flour of vice rotating ring subassembly 04, in order to form vice sealed mill flour, vice rotating ring subassembly 04 location suit is at the other end of axle sleeve 1, so that axle sleeve 1, seal chamber 2 and driving ring subassembly 01, main quiet ring subassembly 02, vice quiet ring subassembly 03 and vice rotating ring subassembly 04 are assembled and are the integral structure.

On the other hand, an accommodating cavity is further arranged on one side of the sealing cavity 2 close to the first mounting groove 2.1, and a lip seal assembly 05 is arranged between the opening end of the accommodating cavity and the outer side wall of the mounting boss 3, so that the accommodating cavity forms a first sealing cavity 100. Specifically, a first flushing hole is formed in the seal cavity 2, and the first oil inlet hole specifically comprises a plurality of oil inlets and at least one oil outlet, so that a multi-point flushing mode is formed, and circulation of flushing oil is guaranteed; and meanwhile, the oil outlet is connected to the screw rotor cavity, so that the functions of a heat dissipation screw and a lubricating screw are achieved.

Specifically, the lip seals subassembly 05 and includes lip seal 20 and jump ring 21, is equipped with the lip seal mounting groove at seal chamber 2's holding chamber open end inside wall, is equipped with the jump ring groove on the outer end lateral wall of lip seal mounting groove, after the lip seal mounting groove is packed into along the axial to lip seal 20, goes into jump ring 21 at the jump ring inslot card, and it is spacing to carry out the axial to lip seal 20, and the inner circle cooperation that the lip sealed 20 is on 3 lateral walls of installation base.

The invention adopts a container type back-to-back double-end-face mechanical seal design: all the sealing components are integrated into a whole, the structure is compact, the integrated structure can guarantee the sealing working height, the installation and maintenance are convenient, and the sealing fault caused by the installation error is reduced; an original isolation seal cavity type structure is adopted, an independent first seal cavity 100 is formed in the integral mechanical seal structure through a lip seal assembly 05 with a special structure between the accommodating cavity and the mounting boss 3 of the shaft sleeve, the seal working direction of the lip seal assembly 05 is to prevent process gas compressed in the process compressor from entering the seal cavity, a first flushing hole is formed in the seal cavity 2, and the first oil inlet hole specifically comprises a plurality of oil inlet holes and at least one oil outlet hole, so that the circulation of flushing oil is ensured; and meanwhile, the oil outlet is connected to the screw rotor cavity, so that the functions of a heat dissipation screw and a lubricating screw are achieved.

As shown in fig. 2, in the present embodiment, a second sealing cavity 110 is formed between the driving ring assembly 01, the driving stationary ring assembly 02, the auxiliary driving ring assembly 04, the auxiliary stationary ring assembly 03 and the outer side of the shaft sleeve 1, and a second flushing hole communicated with the second sealing cavity 110 is further disposed on the side wall of the sealing cavity 2. Specifically, the second flushing hole mainly comprises a liquid inlet hole and a liquid outlet hole. In this embodiment, an isolation liquid/buffer solution is introduced into the second sealed cavity 110 through a corresponding liquid inlet hole, and the pressure of the isolation liquid in the second sealed cavity 110 is generally greater than the pressure of the medium end, so that the medium at the medium end is isolated from the external environment; and the isolating liquid/buffer solution can also play a role in cooling the mechanical seal grinding surface, so that the service life of the seal grinding surface is prolonged.

In the structure, the lip of the seal 20 faces the working cavity direction of the process screw compressor, and the design can effectively prevent the process gas compressed by the process screw compressor from entering the seal cavity from the working cavity and mixing into the seal flushing oil. The pressure design requirement of the flushing oil is higher than the pressure of a working cavity of the compressor, the flushing oil side is arranged on the back surface of the isolation lip seal, and the back surface of the isolation lip seal is pressed, so that the flushing oil has no sealing effect theoretically. The right side position that is close to the lip and seals on seal chamber 2, the design has the oil outlet, makes the flushing oil get into the screw rod, lubricated screw rod, the effect of heat dissipation screw rod, plays the effect that prevents process gas entering seal chamber again simultaneously.

As shown in fig. 2, in the present embodiment, the driving ring assembly 01 includes a first moving ring 4 and a first moving ring seat 5, a moving ring groove 5.1 is provided at one end of the first moving ring seat 5 away from the moving grinding surface, and the first moving ring 4 is hermetically fitted in the moving ring groove 5.1; specifically, a corresponding sealing ring, specifically a rubber O-ring, is arranged between the outer end face of the first rotating ring 4 and the inner side wall of the rotating ring groove 5.1 to form a sealing point, so as to prevent a medium from entering a sealing cavity from a gap between the first rotating ring 4 and the rotating ring groove 5.1. In addition, as shown in fig. 2 and 7, two symmetrically arranged driving protrusions 5.2 are further integrally formed on the first movable ring seat 5, and a driving groove 4.1 matched with the driving protrusions 5.2 is formed on the first movable ring 4.

A plurality of driving screws 6 distributed along the circumferential direction are arranged on the side wall of one end, far away from the first movable ring 4, of the first movable ring seat 5 in a penetrating manner, and the end parts of the plurality of driving screws 6 are tightly fixed on the side wall of the shaft sleeve 1. The structure is mainly used for driving the first movable ring seat 5 and the shaft sleeve 1 to be limited, so that synchronous and stable rotation of the driving ring assembly 01 and the shaft sleeve 1 is guaranteed, and the stability of a sealing surface is improved.

The main static ring component 02 comprises a first static ring 7 and a first static ring seat 8, wherein one end of the first static ring seat 8 is provided with a first static ring groove 8.1, and one end of the first static ring 7, which is far away from a static grinding surface, is assembled in the first static ring groove 8.1 in a sliding and sealing manner; specifically, a sealing ring groove is formed in the inner side wall, close to the opening end, of the first static ring groove 8.1, a sealing ring, specifically an O-ring, is arranged in the sealing ring groove, and the inner side wall of the O-ring is matched with the outer side wall of the first static ring 7 to form a corresponding sealing point. And a corresponding sealing ring is arranged between the outer side wall of the first stationary ring seat 8 and the inner side wall of the first mounting groove 2.1.

The other end of the first stationary ring seat 8 is fitted in the first mounting groove 2.1. In this structure, in order to prevent that main quiet ring subassembly 02 from rotating under the drive of initiative ring subassembly 01 in the machine seals the operation in-process, be provided with second anti-rotation pin 22 in the bottom of first mounting groove 2.1, corresponding afterbody at first quiet ring holder 8 is seted up and is prevented that rotation pin hole 8.2 is prevented to second matched with at second anti-rotation pin 22.

As shown in fig. 2, 4 and 5, a gasket 10 is arranged between the bottom of the first mounting groove 2.1 and the tail end of the first stationary ring 7; one end of the gasket 10 is abutted against the tail end of the first stationary ring 7, and the other end is provided with a first connecting screw 11; and one end of the first stationary ring seat 8 far away from the first stationary ring groove 8.1 is provided with a countersunk through hole 8.3 communicated with the first stationary ring groove 8.1, and the screw head of the first connecting screw 11 is matched in the countersunk through hole 8.3, so that the connection of the gasket 10 and the first stationary ring seat 8 is realized. And, be equipped with a plurality of springs 12 along circumference between first stationary ring 7 tail end and first mounting groove 2.1 bottom, realize that gasket 10 can follow the axial activity of pivot, and then drive the ascending compensation activity of first stationary ring 7 in the axial. In this structure, a plurality of spring holes (not shown) are formed in the bottom of the first stationary ring groove 8.1 along the circumferential direction, one end of a plurality of springs 12 is fitted into the spring holes, and the other end abuts against the end face of the gasket 10. More specifically, as shown in fig. 4 and 5, the bottom of the first stationary ring groove 8.1 is further provided with a communication hole 8.4 communicated with the spring hole, so that the buffer solution/isolation solution in the second seal cavity 110 can enter the spring hole to wash and lubricate the spring, thereby avoiding the phenomena of blockage and jamming and improving the stability of the system. The design that the spring 12 is arranged externally avoids the contact of a conveying medium and the spring 12, and can effectively avoid the influence of the problems of foreign matter blockage, corrosion and the like on the sealing performance of the spring 12.

On the other hand, one end of the gasket 10 close to the first stationary ring 7 is further provided with at least one first anti-rotation pin 9, and the tail end of the first stationary ring 7 is provided with a first anti-rotation pin hole (not shown in the figure) matched with the first anti-rotation pin 9, so that the anti-rotation limit of the first stationary ring 7 is realized.

As shown in fig. 2, the sub stationary ring assembly 03 includes a second stationary ring 13 and a second stationary ring seat 14; one end of the second stationary ring seat 14 is matched in the second mounting groove 2.2, the other end of the second stationary ring seat is provided with a second stationary ring groove 14.1, one end, far away from the stationary wear surface, of the second stationary ring 13 is slidably and hermetically assembled in the second stationary ring groove 14.1, in the structure, when the second stationary ring seat 14 is axially assembled in the second mounting groove 2.2, the second stationary ring seat 14 is provided with a plurality of fastening bolts 24, the screw part of each fastening bolt 24 is connected in the second mounting groove 2.2, and the fixed connection between the second stationary ring seat 14 and the seal cavity 2 is realized, as shown in fig. 3. In the structure, a corresponding O-shaped sealing ring is arranged between the inner side wall of the second static ring 13 and the side wall of the second static ring groove 14.1. A third rotation prevention pin 23 is further provided at the bottom of the second stationary ring groove 14.1, and a third rotation prevention pin groove 13.1 that fits with the third rotation prevention pin 23 is provided on the outer end surface of the second stationary ring 13.

In addition, a compensating element 15 is arranged between the rear end of the second stationary ring 13 and the bottom of the second stationary ring groove 14.1. Specifically, the compensating element 15 is a wave spring, the bottom of the second stationary ring groove 14.1 is provided with an accommodating groove 14.2, one end of the wave spring is fitted in the accommodating groove 14.2, and the other end of the wave spring abuts against the tail end of the second stationary ring 13.

In this embodiment structure, vice rotating ring subassembly 04 includes second rotating ring 16 and second rotating ring seat 17, and second rotating ring seat 17 suit is equipped with the sealing washer in the one end that installation boss 3 was kept away from to axle sleeve 1 between second rotating ring seat 17 inside wall and axle sleeve 1 lateral wall at the one end that the installation boss 3 was kept away from. And a plurality of driving screws 18 are arranged on the side wall of the second movable ring seat 17 along the circumferential direction; specifically, a plurality of threaded holes are formed in the outer side wall of the shaft sleeve 1 along the circumferential direction, and the driving screw 18 is spirally matched in the threaded holes; the end parts of a plurality of driving screws 18 penetrate through the side wall of the shaft sleeve 1 and are tightly connected to the rotating shaft; one end of the second movable ring seat 17 close to the auxiliary stationary ring component 03 is provided with a movable ring mounting boss 17.1 for assembling the second movable ring 16. Specifically, the driving pin 25 is arranged on the movable ring mounting boss 17.1, and the tail end of the second movable ring 16 is provided with a driving pin slot 16.1 matched with the driving pin 25.

As shown in fig. 2 and 6, a plurality of second connection screws 19 are further provided on the sidewall of the second movable ring seat 17, and the plurality of second connection screws 19 and the driving screws 18 are offset from each other. The front end part of the second connecting screw 19 is provided with a limiting convex column 19.1; the side wall of the shaft sleeve 1 is provided with a step counter bore 1.1, the limiting convex column 19.1 of the second connecting screw 19 is matched in the step counter bore 1.1, and the front end part of the second connecting screw 19 is ensured not to exceed the inner side wall of the shaft sleeve 1 so as to avoid interference with a rotating shaft, so that the second moving ring seat 17 is fixedly connected with the shaft sleeve 1. In the structure, the second movable ring seat 17 is directly used as a driving ring, so that the positioning and installation of the second movable ring 16 can be realized, the connection and fixation with the shaft sleeve 1 can be realized, and the shaft sleeve is tightly connected with the rotating shaft, thereby saving parts and optimizing the structure.

As shown in fig. 2 and 3, in this embodiment, in order to make the sealing assembly located at the corresponding working height after the whole set of mechanical seal is assembled, the working height does not need to be adjusted after the whole set of mechanical seal is assembled into the pump body during installation, and the installation convenience is improved. Specifically, there are a plurality of stopper 26 through screwed connection on the terminal surface of second stationary ring seat 14, are equipped with spacing draw-in groove 26.1 on the inside wall of this stopper 26, are equipped with the spacing arch 17.2 that matches earlier with spacing draw-in groove 26.1 on the lateral wall of second rotating ring seat 17, and when spacing arch 17.2 cooperates in spacing draw-in groove 26.1 on stopper 26, whole mechanical seal device adjusts to the working height position. During installation, the whole preassembled whole set of mechanical seal is installed into the installation cavity, then the seal cavity 2 is fixedly connected with the installation cavity through corresponding bolts along the axial direction, the driving screws 18 on the side wall of the second movable ring seat 17 are screwed down, so that the mechanical seal and the rotating shaft are axially fixed and limited, finally, the corresponding limiting blocks 26 are removed, and at this time, the mechanical seal keeps the preassembled working height position, which is very convenient. And each limiting block 26 is detached and stored independently for later machine seal maintenance. During maintenance, the limiting block 26 is installed on the mechanical seal again, and the whole mechanical seal can be integrally disassembled after the driving screw 18 and the connecting bolt are loosened.

In the structure, the main sealing mechanism and the auxiliary sealing structure are static ring compensation types, namely, the compensation springs are arranged on the static ring assembly part, the springs 12 are static and do not rotate along with the rotating shaft, the influence of factors such as equipment vibration, equipment deflection and high linear speed on mechanical sealing is reduced in the operation process, the sealing end face can be effectively guaranteed to be always attached, and the compensation is more stable.

In the double-end-face mechanical sealing structure, the auxiliary sealing mechanism is arranged besides the main sealing mechanism, so that the problem of leakage of the isolating liquid/buffer solution can be effectively solved, the sealing performance can be maintained for a short time when the main sealing is invalid, precious time is strived for equipment maintenance and fault removal, and meanwhile, the phenomenon that toxic and harmful substances possibly contained in process gas are leaked into the air to cause danger and environmental damage can be avoided, and the safety guarantee effect is achieved.

The dynamic and static ring materials of the invention are all carbon-added silicon carbide materials. The wear-resistant rubber material has a self-lubricating effect while ensuring good wear resistance.

Besides the isolation function of designing a unique isolation sealing cavity structure, the invention also has the following advantages:

1. unique limited integrated mode of buckle formula:

the limiting clamping groove 26.1 on the limiting block 26 and the limiting bulge 17.2 of the second movable ring seat 17 form a snap fit, and the sealed movable component and the sealed static component are integrated together. Meanwhile, the working length of the mechanical seal can be limited by the buckling fit; the integrated design of this kind of buckle formula, integrated, stop gear than the sealed usefulness of tradition is more stable, can not drop and move with the cluster, has fine external shock resistance, and spacing accurate simultaneously can accurate guarantee mechanical seal's working length, avoids causing the problem of sealed inefficacy because of the installation problem.

Moreover, the on-site actual dismounting operation proves that the packaging type sealing design avoids the problems of complex installation, high requirement on installation technology of installation personnel, large influence by installation environment, large influence by human factors, long time consumption for installation and maintenance and the like of the traditional non-packaging type sealing, greatly improves the convenience of sealing dismounting and maintenance, solves the problem of sealing failure caused by the technology and the installation environment of the installation personnel, and improves the stability of sealing.

2. The back-to-back static sealing structure is arranged and designed in the screw compressor equipment which should be processed:

the static ring compensation components of the main seal and the auxiliary seal are designed and arranged in a back-to-back mode on the seal cavity 2. The sealing space can be effectively saved, the sealing structure is simplified, and the defects that the rotary mechanical seal is greatly influenced by vibration, linear rotating speed, cavitation and evacuation in the working condition of the process screw compressor are overcome. The static mechanical seal is more suitable for the complex working conditions of the process screw compressor.

3. The flushing inlet of the main seal adopts a multi-point flushing structure. The uniform and sufficient flushing of the sealing end face can be effectively ensured.

4. The secondary auxiliary sealing transmission seat has a unique structural design, and adopts a design that the positioning and the transmission share one part.

The transmission seat (second movable ring seat 17) realizes the functions of transmission and positioning connection through driving screws 18 and second connecting screws 19 with different functions. And a second connecting screw 19 with a cylindrical head passes through a corresponding threaded hole of the second movable ring seat 17, a cylindrical head at the front end of the screw is inserted and connected with a step counter bore 1.1 on the shaft sleeve 1, and the cylindrical head part of the second connecting screw 19 does not exceed an inner hole of the shaft sleeve 1, so that the auxiliary sealed movable assembly is limited and has a transmission effect. The concave end driving screw 18 is locked with the equipment shaft through the threaded hole of the second movable ring seat 17 and the through hole on the shaft sleeve 1 in sequence, and axial and circumferential transmission is provided for the whole set of sealing rotary component.

5. Sealing end face material: adopting a novel silicon carbide material: the carbon-added silicon carbide is used as a sealing end face material. The problem that the end face of graphite in the screw compressor is easy to blister is solved; meanwhile, the material has good self-lubricating performance, the PV value of the material can be greatly improved, and the problem of excessive material abrasion caused by a high rotating speed belt and a large shaft diameter is solved; the material of the sealing ring preserves the specific properties of silicon carbide, can prevent process gas or impurities mixed with flushing oil from abrading the sealing end face, improves the sealing stability, reliability and wear resistance, and prolongs the sealing service life.

The foregoing has described preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary, and various changes made within the scope of the independent claims of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a collection dress formula mechanical seal for technology screw compressor, includes axle sleeve (1) and seal chamber (2), axle sleeve (1) wear to establish in seal chamber (2), axle sleeve (1) outside cover is equipped with initiative ring subassembly (01), main quiet ring subassembly (02), vice quiet ring subassembly (03) and vice rotating ring subassembly (04), its characterized in that: a first mounting groove (2.1) is formed in one end of the inner side of the sealed cavity (2), the tail end of the main static ring component (02) is hermetically assembled in the first mounting groove (2.1), the ground surface end of the main static ring component (02) is attached to the ground surface end of the driving ring component (01) to form a main sealing ground surface, and the tail end of the driving ring component (01) is hermetically assembled on a mounting boss (3) at one end of the shaft sleeve (1); the other end of the inner side of the sealing cavity (2) is provided with a second assembling groove (2.2), the tail end of the auxiliary static ring component (03) is assembled in the second assembling groove (2.2) in a sealing mode, the grinding surface end of the auxiliary static ring component (03) is attached to the grinding surface of the auxiliary moving ring component (04) to form an auxiliary sealing grinding surface, and the auxiliary moving ring component (04) is positioned and sleeved at the other end of the shaft sleeve (1) so that the shaft sleeve (1), the sealing cavity (2), the driving ring component (01), the main static ring component (02), the auxiliary static ring component (03) and the auxiliary moving ring component (04) are integrated into an integrated structure; one side of the sealing cavity body (2) close to the first mounting groove (2.1) is further provided with a holding cavity, and a lip seal assembly (05) is arranged between the opening end of the holding cavity and the outer side wall of the mounting boss (3), so that the holding cavity forms a first sealing cavity (100).

2. The integrated mechanical seal for a process screw compressor according to claim 1, wherein: the driving ring assembly (01) comprises a first moving ring (4) and a first moving ring seat (5), a moving ring groove (5.1) is formed in one end, far away from the moving grinding surface, of the first moving ring seat (5), and the first moving ring (4) is assembled in the moving ring groove (5.1) in a sealing mode; a plurality of transmission screws (6) distributed along the circumferential direction are arranged on the side wall of the other end of the first movable ring seat (5) in a penetrating mode, and the end portions of the transmission screws (6) are tightly fixed on the side wall of the shaft sleeve (1).

3. The integrated mechanical seal for a process screw compressor according to claim 1 or 2, characterized in that: the main static ring component (02) comprises a first static ring (7) and a first static ring seat (8), wherein a first static ring groove (8.1) is formed in one end of the first static ring seat (8), and one end, far away from a static wear surface, of the first static ring (7) is assembled in the first static ring groove (8.1) in a sliding and sealing mode; the other end of the first stationary ring seat (8) is assembled in the first mounting groove (2.1).

4. The integrated mechanical seal for a process screw compressor according to claim 3, wherein: a gasket (10) is arranged between the bottom of the first mounting groove (2.1) and the tail end of the first stationary ring (7); one end of the gasket (10) is abutted against the tail end of the first static ring (7), the other end of the gasket is provided with a first connecting screw (11), one end, far away from the first static ring groove (8.1), of the first static ring seat (8) is provided with a countersunk through hole (8.3) communicated with the first static ring groove (8.1), and the head of the first connecting screw (11) is matched in the countersunk through hole (8.3); a plurality of springs (12) are arranged between the tail end of the first stationary ring (7) and the bottom of the first mounting groove (2.1) along the circumferential direction.

5. The integrated mechanical seal for a process screw compressor according to claim 4, wherein: the anti-rotation device is characterized in that one end, close to the first stationary ring (7), of the stationary ring gasket (10) is further provided with at least one first anti-rotation pin (9), and the tail end of the first stationary ring (7) is provided with a first anti-rotation pin hole matched with the first anti-rotation pin.

6. The integrated mechanical seal for a process screw compressor according to claim 1, wherein: the auxiliary static ring assembly (03) comprises a second static ring (13) and a second static ring seat (14); one end of the second static ring seat (14) is matched in the second mounting groove (2.2), the other end of the second static ring seat is provided with a second static ring groove (14.1), one end, far away from a static grinding surface, of the second static ring (13) is assembled in the second static ring groove (14.1) in a sliding and sealing mode, and a compensation element (15) is arranged between the tail end of the second static ring (13) and the bottom of the second static ring groove (14.1).

7. The integrated mechanical seal for a process screw compressor according to claim 6, wherein: the compensating element (15) is a wave spring, a containing groove (14.2) is formed in the bottom of the second static ring groove (14.1), one end of the wave spring is matched in the containing groove (14.2), and the other end of the wave spring abuts against the tail end of the second static ring (13).

8. The integrated mechanical seal for process screw compressors according to claim 1 or 6, characterized in that: the auxiliary moving ring assembly (04) comprises a second moving ring (16) and a second moving ring seat (17), the second moving ring seat (17) is sleeved at one end, far away from the mounting boss (3), of the shaft sleeve (1), a plurality of driving screws (18) are arranged on the side wall of the second moving ring seat (17) along the circumferential direction, and the end parts of the driving screws (18) penetrate through the side wall of the shaft sleeve (1) and are tightly connected to the rotating shaft; and a movable ring mounting boss (17.1) for assembling a second movable ring (16) is arranged at one end of the second movable ring seat (17) close to the auxiliary stationary ring component (03).

9. The integrated mechanical seal for a process screw compressor according to claim 8, wherein: a plurality of second connecting screws (19) are further arranged on the side wall of the second movable ring seat (17), and limiting convex columns (19.1) are arranged at the front end parts of the second connecting screws (19); the side wall of the shaft sleeve (1) is provided with a step counter bore (1.1), and the limiting convex column (19.1) of the second connecting screw (19) is matched in the step counter bore (1.1) so as to realize the fastening connection of the second movable ring seat (17) and the shaft sleeve (1).

10. The integrated mechanical seal for a process screw compressor according to claim 1, wherein: a first flushing hole communicated with the first sealing cavity (100) is formed in the side wall of the sealing cavity (2); a second sealing cavity (110) is formed between the driving ring assembly (01), the main static ring assembly (02), the auxiliary moving ring assembly (04), the auxiliary static ring assembly (03) and the outer side of the shaft sleeve (1), and a second flushing hole communicated with the second sealing cavity (110) is further formed in the side wall of the sealing cavity (2).