CN101084375A

CN101084375A - Valve, in particular for compressors

Info

Publication number: CN101084375A
Application number: CNA2005800440918A
Authority: CN
Inventors: M·斯基亚沃内
Original assignee: Dott Ing Mario Cozzani S R
Current assignee: Dott Ing Mario Cozzani S R; Dott ing Mario Cozzani Srl
Priority date: 2004-12-22
Filing date: 2005-11-18
Publication date: 2007-12-05
Anticipated expiration: 2025-11-18
Also published as: DE602005020186D1; KR20070085826A; CN101084375B; ITGE20040116A1; JP5148287B2; US20090126807A1; BRPI0519219A2; KR101258303B1; JP2008524510A; ATE462080T1; WO2006067011A1; EP1831564A1; EP1831564B1; ES2342547T3; BRPI0519219B1

Abstract

Valve, in particular for compressors, comprising a seat (1) provided with at least one flow way (111), an obturator member (4) able to obstruct said flow way (111) and movable with respect to said seat in a given direction, and means (5) for resiliently stressing said obturator (4), which are able to force said obturator (4) into a given position and are active in the direction of movement thereof; said resilient stressing means (5) comprise at least one cylindrical helical compression spring (5), characterized by the presence, between all the turns and along the entire working length of the spring (5), of inter-turn apertures.

Description

Be used in particular for the valve of compressor

Technical field

The present invention relates to a kind of valve, particularly a kind of valve that is used for the reciprocal compressor of re alphapro type.

Background technique

The type of the valve that uses in described compressor at present is generally self-acting valve, comprises a valve body that is called seat, and it comprises a plate, and a plurality of concentric or nonconcentric(al) shaft orientation flowing channels are formed in the plate.The unlatching of described runner and closure realize that by interlocking device the latter can be made of a plurality of elements or discrete component.Interlocking device is subjected to the effect of elasticity pressurization device under all scenario, and the latter typically is round metal cylindricality spiral compression spring.Spring is accommodated in the valve body (being called " counter-seat ") that comprises plate, and runner is formed in the plate.But above-mentioned spring shell is the contained spring guard member also, and the function of the Metal Contact between elimination spring surface and the external metallization parts (as being formed in the counter-seat or the wall of the shell in the interlocking device self) is preferably made and had to described guard member by thermoplastic material.

Most of described springs all are the compression types with cylindrical spiral or tapered auger.Total number of wire turns of the summation of wire turn and passive wire turn forms the described spring of being made by steel wire by being equivalent to initiatively.Passive wire turn contacts with adjacent wire turn, and described in addition wire turn is suitable for being polished endways (ground) axial stability to guarantee that described spring is good.

Spring has constituted one of the parts of the most critical of valve; In fact, high-frequency opened/closed on the spring and with parts that spring contacts on cause heterogeneity and wearing and tearing in various degree.According to prior art, great majority are analyzed and qualitative by the described wearing and tearing that the spring motion produces, and can be classified as follows:

Wearing and tearing between the outer surface of spring and the surface of outer shell cavity can be eliminated by import plastic components between spring and shell;

Wearing and tearing between spring lower end and the outer shell cavity stayed surface can be eliminated by importing plastic components;

The spring top with and the surface that contacts of interlocking device between wearing and tearing, can eliminate by importing plastic components or importing the plastics interlocking device.

Although there are these to improve, spring remain valve most critical one of parts and be the reason of fault.The development of the compressor that accelerates day by day and the oil content of constantly making great efforts to eliminate in the pressurized gas have caused the integrity problem of above-mentioned parts serious day by day.

Summary of the invention

Therefore the object of the present invention is to provide a kind of valve that is used for compressor, the wearing character of its medi-spring compared with prior art is optimised, thereby guarantees that compressor has longer working life.

Therefore the present invention relates to a kind of valve, particularly a kind of valve that is used for compressor comprises the seat with at least one runner; The interlocking device of can the described runner of blocking-up and can move along assigned direction with respect to described seat; And the device that flexibly stresses on described interlocking device, it can force described interlocking device to enter given location and can work (active) on its moving direction; Described elasticity pressurization device comprises at least one cylindrical helical compression spring, it is characterized in that: have the turn-to-turn hole between all wire turns and along the whole active length of described spring.

Another feature of valve according to the present invention, described cylindrical helical compression spring is provided with the turn-to-turn hole between all wire turns and along the whole active length of described spring, and the diameter difference that exists between end turns that is preferably open conical end wire turn and next-door neighbour's wire turn is at least about 1.5 times of cross section of the wire that forms described spring, preferred 2 times.

In a preferred embodiment, end turns all has the size less than next-door neighbour's wire turn.Advantageously, valve of the present invention can have guard member, preferably be made of plastics and be positioned at hold spring enclosure to prevent its further wearing and tearing.

Description of drawings

Other advantage of device of the present invention and characteristic will be more clear according to the description of the indefiniteness that regards to embodiment down, and the following accompanying drawing of reference:

Fig. 1 is the cross-sectional view of valve according to an embodiment of the invention;

Fig. 2 is the details of cross section of another kind of work structuring of the valve of Fig. 1;

Fig. 3 is for being used for the planimetric map of the spring of valve according to the present invention; And

Fig. 4 A and 4B are two cross-sectional views of spring, and its dormant state and compressive state are shown respectively.

Embodiment

Fig. 1 illustrates an embodiment according to valve of the present invention; The seat of the described valve of 1 expression, it comprises plate 101, plate 101 is provided with central axis that a plurality of axial concentric through holes 111 and having as fluid course cooperate with the threaded end 306 of bolt 6 to tapped through hole 201.Also be formed with the groove 121 that is communicated with through hole 111 on the plate 101.Lining 406 also is installed on the middle body of bolt 6 and has the counter-seat 2 of central axial hole 302, lining 406 and counter-seat 2 are fixed together by the nut 106 of the threaded end 206 of screw-in bolt 6.Axial passage 102 is formed in the counter-seat 2.

Interlocking device 4 is between seat 1 and counter-seat 2, and is coaxial concentric and can endwisely slip along it by its central axis hole 304 with lining 406.Be formed with the eccentric opening 104 that the axial bore 111 with respect to the plate 101 of seat 1 axially is crisscross arranged in the interlocking device, these holes path 10 2 interior with being formed at counter-seat 2 aimed at simultaneously.In addition, seat 1 and counter-seat 2 are joined together by pin 401, and this pin 401 is inserted into the blind hole 202 that the interior and hole 204 that pass interlocking device 4 of blind hole 301 in the plate 101 enters counter-seat 2.

Counter-seat 2 also is provided with cylinder blanket 402, arranges that in this shell 402 cylindrical helical compression spring 5, end turns 105 have than the diameter littler with its next-door neighbour's wire turn 205.

Inserts

412 and 422 is arranged in shell 402 inside, and the function of the Metal Contact between elimination spring 5 and the associated enclosure 402 is preferably made and had to described inserts by thermoplastic material or analog.Because the effect of spring 5, the end wall of inserts 412 is pressed against on the surface of interlocking device 4, and owing to the fluid flow function in the hole 111 in the plate 101 that passes seat 1, interlocking device 4 is illustrated as open state in the drawings.Figure medi-spring 5 is shown in compression in the shell 402.

Fig. 2 illustrates the cross-section details of the valve of Fig. 1; Identical parts are represented by identical reference character.The valve that herein illustrates is a closed state, and the groove 121 in interlocking device 4 and the plate 101 contacts, and groove 121 is communicated with the hole 111 that fluid passes through as shown in Figure 1.Spring 5 is illustrated as equilibrium state herein, is in a ratio of elongation with state shown in Fig. 1.

Fig. 3 is the planimetric map that acts on the spring 5 on the interlocking device 4 of valve; Can notice that the diameter of visible end wire turn 105 is less than the diameter of the wire turn 205 that is adjacent among the figure.On the other hand, Fig. 4 A and 4B have emphasized to exist this fact of turn-to-turn hole, and diameter difference makes all wire turns on useful active section can not interfere with each other between open conical end wire turn 105 and next-door neighbour's the wire turn 205.

The working principle of valve of the present invention will be more clear according to following description.The type of the valve shown in Fig. 1 is generally used for compressor and must carries out high frequency ground and open and closed procedure.Therefore, act on that elasticity pressurization device on the interlocking device 4 stands a large amount of wearing and tearing and this can't influence the normal running of valve with remedying.Spring 5 has the characteristic that manys that can guarantee that its degree of injury that is subjected to than common cylindrical helical spring is little.The one of the main reasons of described spring wearing and tearing is that described end turns is parallel to each other and perpendicular to the axis of spring, but tilts with respect to the plane (being the plane at other wire turn place of spring) of spiral extension.In fact this different inclination causes the load distribution inequality on the spring and makes it be easier to wearing and tearing.

Because the existence in turn-to-turn hole and described end turns 105 and the wire turn that is close to be reducing of diameter group mutually, this wear effects is greatly reduced and even is eliminated fully under this situation.As can be seen, the diameter difference between the characteristic of spring, the wire turn between the existence in hole and the described end turns has been guaranteed not interfere with each other (referring to Fig. 4 B) between the compression period of described spring between all wire turns on the whole useful active section from Fig. 4 A and 4B; Therefore, the wire turn of spring can not produce wearing and tearing, and spring is working near the mode of original configuration, and its operating life significantly improves.

Advantageously, by in shell 402, inserting

thermoplastic inserts

412 and 422, can further eliminate the Metal Contact between the wall of spring 5 and counter-seat 2 and/or interlocking device 4.

So the valve of design can be guaranteed the accurate work under high frequency is used on the one hand, but thereby on the other hand significant prolongation elasticity pressurization device valve self mean lifetime.

Claims

1, a kind of valve, valve especially for compressor, comprise the seat (1) that is provided with at least one runner (111), described runner capable of blocking (111) also can be with respect to described interlocking device (4) that moves along assigned direction, and the elasticity pressurization device (5) that is used for flexibly stressing on described interlocking device (4), it can force described interlocking device (4) to enter given location and can work on its moving direction; Described elasticity pressurization device (5) comprises at least one cylindrical helical compression spring (5), it is characterized in that: have the turn-to-turn hole between all wire turns and along the whole active length of spring (5).

2, valve as claimed in claim 1 is characterized in that: the diameter difference between end turns (105) and next-door neighbour's the wire turn (205) is at least about 1.5 times of cross section of the wire that forms described spring.

3, valve as claimed in claim 1, wherein the diameter difference between end turns (105) and next-door neighbour's the wire turn (205) is 2 times of the cross section of the wire that forms described spring.

4, valve as claimed in claim 1, wherein end turns (105) all has the little diameter of wire turn (205) than the next-door neighbour.

5, any described valve among the claim 1-4 as described above, wherein said conical end wire turn is polished.

6, any described valve among the claim 1-5 as described above, wherein said pressure spring is conical.

7, any described valve among the claim 1-6 as described above, the pitch of wherein said spring is variable.

8, any described valve among the claim 1-7 as described above, wherein said elasticity pressurization device (5) is arranged in the inside of shell (402), and described shell (402) is suitably located with respect to described interlocking device (4).

9, any described valve among the claim 1-8 as described above, wherein the guard member of preferably being made by plastic materials (412,422) is disposed in the shell that holds spring.