CN201284741Y

CN201284741Y - Meshing structure of single-screw meshing pair

Info

Publication number: CN201284741Y
Application number: CNU200820167450XU
Authority: CN
Inventors: 徐道敏; 王敏
Original assignee: Individual
Current assignee: ZHEJIANG JIENENG COMPRESS EQUIPMENT CO Ltd
Priority date: 2008-11-07
Filing date: 2008-11-07
Publication date: 2009-08-05
Anticipated expiration: 2018-11-07

Abstract

The utility model belongs to the technical field of machinery, and in particular to a meshing structure of a single screw meshing pair. The single screw meshing pair consists of a screw and a star wheel which are meshed into a conjugating curved surface formed by high-density line contact under the state of relative motion. Line contact envelopes of the star wheel teeth entering the bottom of a thread groove of the screw form a basic regular triangle-shaped conjugating curved surface. Line contact envelopes of the star wheel teeth just entering the screw threads and leaving the thread groove of the screw form a basic right triangle-shaped conjugating curved surface. The utility model adopts the single screw meshing pair with high-density contact lines to replace the contact line tooth shape widely used in the existing single screw compressors or expansion machines, the high-density contact lines simultaneously exist during the meshing work process of the screw and the star wheel, so the contact stress is reduced, and the problem of easy abrasion of the star wheel is fundamentally solved. The utility model reduces leakage, enhances volume efficiency, and decreases energy consumption.

Description

The meshing engagement structure of single screw engages pair

Technical field

The utility model belongs to field of mechanical technique, relates in particular to the meshing engagement structure of single screw engages pair, is specially adapted to single screw compressor, decompressor.

Background technique

The universal electromechanical integrated product of industries such as single screw compressor, decompressor are widely used in building, chemical industry, machinery, weaving, mine, electronics, railway locomotive, steamer, naval vessels.Compare with double-screw compressor with piston compressor, have simple in structure, advantages such as running is reliable, noise is low, power consumption province.

Up to now, domestic and international single screw engages paratype line adopts three kinds of molded lines, many " lines enveloping " molded lines of usefulness, the round platform twice-enveloping molded lines of " having two instantaneous contact lines in gear motion " and the molded lines of " three Line of contact are arranged simultaneously ".But since screw channel bottom surface and star-wheel Topland to contact the position of molded lines on the star-wheel working surface be changeless, the contact stress of engagement pair in movement process is big, thereby wearing and tearing easily, lack working life, the screw channel bottom surface also can't process with rotating tool.

The model utility content

The purpose of this utility model is in order to overcome the deficiency of existing single screw compressor screw rod working surface, a kind of meshing engagement structure that reduces single screw engages pair of the contact stress of engagement pair in movement process to be provided.

The meshing engagement structure of a kind of single screw engages pair of the utility model, single screw engages pair is made up of screw rod and star-wheel, it is characterized in that screw rod and star-wheel under the relative movement state, and its engagement is the conjugate surface that a kind of high-density lines contact is formed.

The meshing engagement structure of described single screw engages pair is characterized in that line contact envelope when the star-wheel tooth enters into the screw flight bottom land is positive triangle conjugate surface basically.

The meshing engagement structure of described single screw engages pair is characterized in that when the star-wheel tooth has just entered into screw flight that line when leaving the screw flight bottom land contacts envelope and is basically right angle trigonometry conjugate surface.

Line of contact on the mating face of screw rod and star-wheel gathers, and when the densely covered degree height of Line of contact arrived to a certain degree, its engagement just formed conjugate surface.

The beneficial effects of the utility model are: adopt the high Line of contact that gathers single screw engages pair of (accurately processing is equivalent to the face contact), the flute profile that replaces the Line of contact that extensively adopts in present single screw compressor or the decompressor, make screw rod and star-wheel in the joggleword process, have the high Line of contact that gathers to exist simultaneously, reduced contact stress, fundamentally solved star-wheel problem easy to wear, reduced leakage simultaneously, improved volumetric efficiency, reduced power consumption, and the screw rod working surface only needs one rotating tool processed.

Description of drawings

Fig. 1 is a single helical-lobe compressor intermeshing pair shape schematic representation of the present utility model.

Fig. 2 is a screw rod working surface schematic representation of the present utility model.

Fig. 3～Fig. 8 is a Line of contact schematic representation in each process that meshes.

Embodiment

With reference to Fig. 1, Fig. 2, the utility model list screw engages pair is made up of with two relative star-wheels 2 screw rod 1.From the Differential Geometry angle, be the pair of meshing pair of constant for velocity ratio, if oneself knows the original curved surface of a rotor, use suitable transformation of coordinates and meshing condition formula, can try to achieve the conjugate surface of another rotor.Screw rod 1 and star-wheel 2 are under the relative movement state, and its profilogram meets the following conditions: (1) two profile curve in office is instantaneous all a curve or contact---contact conditions a bit; (2) two a profile lines point of contact in office is tangent---and the phase tangent condition, then the design's engagement is the conjugate surface that a kind of highly dense wiring contact is formed.

With reference to Fig. 3, Fig. 4, when the star-wheel tooth entered into the screw flight bottom land, the star-wheel tooth contacted envelope and is basically positive triangle conjugate surface with the line of screw flight two mating face A1, A2.

With reference to Fig. 5, Fig. 6, when the star-wheel tooth had just entered into screw flight, the star-wheel tooth contacted the right angle trigonometry conjugate surface basically that envelope is symmetry with the line of screw flight two mating face B1, B2, and wherein the conjugate surface of B2 is greater than the conjugate surface of B1.

With reference to Fig. 7, Fig. 8, when the star-wheel tooth will leave the screw flight bottom land, the star-wheel tooth contacted the right angle trigonometry conjugate surface basically that envelope is symmetry with the line of screw flight two mating face C1, C2, and wherein the conjugate surface of C2 is greater than the conjugate surface of C1.

Add man-hour, star-wheel tooth length of action is divided into N five equilibrium (isodisperse is many more, and the Line of contact that is obtained is many more), the utilization Differential Geometry calculates the each point helix angle, on the star-wheel drawing, put on the each point helix angle,, make that the each point helix angle adheres to specification on the star-wheel by precision machining method.In order to guarantee the machining accuracy on screw rod mating face, along the position that the ring envelope surface moves cutter, mobile number of times is many more, and then machining accuracy is high more.

Claims

1, a kind of meshing engagement structure of single screw engages pair, single screw engages pair is made up of screw rod and star-wheel, it is characterized in that screw rod and star-wheel under the relative movement state, and its engagement is the conjugate surface that a kind of high-density lines contact is formed.

2,, it is characterized in that line contact envelope when the star-wheel tooth enters into the screw flight bottom land is positive triangle conjugate surface basically according to the meshing engagement structure of the described single screw engages pair of claim 1.

3,, it is characterized in that when the star-wheel tooth has just entered into screw flight that line when leaving the screw flight bottom land contacts envelope and is basically right angle trigonometry conjugate surface according to the meshing engagement structure of the described single screw engages pair of claim 1.