CN102032258B

CN102032258B - Screwed connection structure

Info

Publication number: CN102032258B
Application number: CN200910235282.2A
Authority: CN
Inventors: 张文海
Original assignee: BEIJING JINGJIE RUISI TECHNOLOGY DEVELOPMENT CO Ltd
Current assignee: BEIJING JINGJIE RUISI TECHNOLOGY DEVELOPMENT CO Ltd
Priority date: 2009-09-29
Filing date: 2009-09-29
Publication date: 2015-03-11
Anticipated expiration: 2029-09-29
Also published as: CN102032258A

Abstract

The invention provides a screwed connection structure, comprising a connection body and a screw thread arranged on the connection body. The screw thread is provided with a plurality of standard screw pitches and at least one first screw pitch which is different from the standard screw pitches in length. The first screw pitch is not equal to the integral multiples of the standard screw pitches, and the first screw pitch and the standard screw pitches are arranged at intervals. he invention, the contact surface and connection surface of the screw thread and an object to be connected are changed, and the pressure and frictional force between the contact surface of the connection structure and the object to be connected are increased through changing the screw pitch between adjacent screw threads, thereby achieving the purposes of preventing the loosing of the thread screw and enhancing the sealing performance between the objects to be connected. The screwed connection structure provided by the invention is convenient, safe and fast in operation and low in cost, and is suitable for various connection structures needing the screwed connection.

Description

A kind of screw connection structure

Technical field

The present invention relates to worm structure, all spendable screw connection structure when particularly relating to a kind of fastening and sealing.

Background technique

In being threaded of routine, prevent thread looseness from being practical challenges always, some compression springs are locking, also the use check washer had is locking, but in Long-Time Service, the effect of existing locking mode is unsatisfactory, is especially bearing fluctuating load occasion for a long time and is more having huge potential safety hazard under the environment that vibrates.In order to reach fastening effect, the modes such as the clear-cut pin also had are fixed again, but very inconvenient when dismounting.

In being threaded of routine; the problem of the sealability ensureing joint is needed when often also can relate to connection; Normal practice on screw thread, is wound around adhesive tape, gluing, adds the modes such as sealing gasket; but its effect is all undesirable; especially more unreliable under vibrations or hot environment; and easily aging, if cause some specialized fluids by time have leakage to cause a serious accident.

Summary of the invention

In order to solve by the problem that screw thread when being threaded easily loosens and sealability is not strong, the invention provides a kind of screw connection structure, comprising:

The screw thread connecting body and be arranged on described connection body, it is characterized in that, described screw thread is that formed by the continuous protruding structure with triangular cross-sectional shape, helically linear on described connection body surface continuous thread, described continuous thread has the first pitch of multiple standard pitch and at least one and described standard pitch different length, and described first pitch is not equal to the integral multiple of described standard pitch;

Described first pitch and described standard pitch interval are arranged.

Described first pitch is that length is greater than a described standard pitch, and be less than the second pitch of two described standard pitch sums, or length is less than the 3rd pitch of a described standard pitch, or the screw thread at the screw thread at described second pitch place and described 3rd pitch place is arranged side by side the 4th pitch that formed screw thread has, or described second pitch, the 3rd pitch, two or three combination arbitrarily in the 4th pitch.

When described first pitch is the 4th pitch, described 4th pitch is described second pitch and described 3rd pitch sum, and is less than two described standard pitch sums.

Described connection body is bolt or pipe thread.

Compared with prior art, the present invention has following beneficial effect:

The present invention is by changing the pitch between adjacent thread, change surface of contact and the junction plane of screw thread and object to be connected, pressure between the surface of contact of increase linkage structure and object to be connected and frictional force, thus reach the object preventing thread looseness, and strengthen the sealability between object to be connected.Screw connection structure of the present invention has effect convenient to operation, safe, with low cost, and being applicable to needs arbitrarily to use screw thread to carry out in the linkage structure connected.

Accompanying drawing explanation

Fig. 1 is the application scenarios schematic diagram of the first embodiment of worm structure of the present invention;

Fig. 2 is the partial enlargement overall diagram of the part A of first embodiment of the invention;

Fig. 3 is the enlarged fragmentary portion figure of the part A of first embodiment of the invention;

Fig. 4 is the application scenarios schematic diagram of second embodiment of the invention;

Fig. 5 is the partial enlargement overall diagram of the part B of second embodiment of the invention;

Fig. 6 is the worm structure sectional drawing of third embodiment of the invention.

Embodiment

The invention provides a kind of worm structure, easily loosening the problem not strong with the sealing of screw thread with solving with screw thread in thread connecting mode.The present invention is mainly used in the structure that the fastening linkage structure of various thread connecting mode and having uses during seal request.

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further details.

< first embodiment >

Be the application scenarios schematic diagram of the first embodiment of worm structure of the present invention with reference to figure 1, Fig. 1, in the present embodiment, screw connection structure is bolt, is used for workpiece 1 and workpiece 2 to link together.Workpiece 1 can need to be fixed object for mirror, switch, socket etc., and workpiece 2 can be the fixed attachments such as body of wall, support body.With bolt 3, workpiece 1 and workpiece 2 are linked together, and be fixed on workpiece 2.Part A is the attachment portion of bolt 3 and workpiece 2.

The partial enlargement overall diagram of the part A that bolt 3 is connected with workpiece 2 is with reference to shown in figure 2, and the drafting ratio of this figure is 4: 1.Workpiece 2 has internal thread, and pitch is standard pitch P.Bolt 3 has outside thread, this outside thread is that formed by the continuous protruding structure with triangular cross-sectional shape, helically linear on described connection body surface continuous thread, outside thread has a segment standard pitch P, the pitch of then adjacent with the screw thread with standard pitch P screw thread changes into pitch Q, and the length of Q is greater than the length of P.The pitch at the screw thread place adjacent with the screw thread with pitch Q changes into standard pitch P again, that is, the screw thread of the present embodiment is that Unequal distance is arranged, a non-standard screw-pitch both can be set, also multiple non-standard screw-pitch can be set, when being provided with multiple non-standard screw-pitch, non-standard screw-pitch and standard pitch interval can be arranged.

When using bolt 3, screw in workpiece 2 by bolt 3 by workpiece 1, the screw thread with standard pitch P first entering workpiece 2 normally screws, as shown in the pitch P of two on the right of Q in Fig. 2, now, the left surface of the screw thread of workpiece 2 contacts with the right flank of the screw thread of bolt 3.When being screwed into pitch Q, the right flank of the screw thread of the workpiece 2 within the scope of pitch Q contacts with the left surface of the screw thread of bolt 3, and the surface of contact of the screw thread with standard pitch P of rear screw-in on the left of pitch Q and the screw thread of workpiece 2 all there occurs above-mentioned change.Length due to pitch Q is greater than the length of pitch P, therefore, after such change, the pressure between surface of contact and frictional force can be increased, revolve tighter and tighter, make junction plane close contact, until interference connects (can adjust magnitude of interference according to locking degree and seal degree), thus reach locking and the object of sealing.

Drafting ratio with reference to the enlarged fragmentary portion figure that figure 3, Fig. 3 is the part A of first embodiment of the invention, this figure is 4: 1, clearly can find out standard pitch P and the spaced situation of non-standard screw-pitch Q from Fig. 3.

< second embodiment >

In the present embodiment, screw connection structure is used for connect two workpiece, workpiece 4 and the workpiece 5 that there is fluid inside.Shown in figure 4, Fig. 4 is the application scenarios schematic diagram of second embodiment of the invention, and screw connection structure is arranged on workpiece 4, and workpiece 4 can for having externally threaded pipe thread, and workpiece 5 can for having the pipeline of internal thread.Part B is the attachment portion of workpiece 4 and workpiece 5.

The partial enlargement overall diagram of the part B that workpiece 4 is connected with workpiece 5 is with reference to shown in figure 5, and the drafting ratio of this figure is 4: 1.The internal thread of workpiece 5 has standard pitch P, and be provided with non-standard screw-pitch W and R between externally threaded adjacent two standard pitch P of workpiece 4, the length of W is less than the length of P, and the length of R is greater than the length of P.W and R sum is less than the length of 2P.

After workpiece 4 screws in workpiece 5, the screw thread first screwed in normally screws, and the left surface of the screw thread of workpiece 5 contacts with the right flank of the screw thread of workpiece 4.When being screwed into improper pitch W and R, length due to W is less than the length of P, and the length of R is greater than the length of P, therefore, two sides of the screw thread within the scope of W do not contact with the side of the screw thread within the scope of standard pitch P, and the right flank of the screw thread of workpiece 4 within the scope of pitch R contacts with the left surface of the screw thread of workpiece 5.The helical thread portion that (namely on the left of W and R) screws in afterwards after W and R, the left surface of the screw thread of workpiece 5 still contacts with the right flank of the screw thread of workpiece 4, but, because the pitch between standard pitch P there occurs above-mentioned change, when therefore making the left surface of the screw thread of the workpiece 5 on the pitch W left side contact with the right flank of the screw thread of workpiece 4, act on and when left surface that pressure on the left surface of the screw thread of workpiece 5 and frictional force is all greater than the screw thread of the workpiece 5 on the right of pitch R contacts with the right flank of the screw thread of workpiece 4, to act on pressure on the left surface of the screw thread of workpiece 5 and frictional force.This change makes workpiece 4 to revolve tighter and tighter, thus rise reach locking and sealing object.

< the 3rd embodiment >

Shown in figure 6, Fig. 6 is the worm structure sectional drawing of third embodiment of the invention, non-standard screw-pitch Q ' is provided with between the standard pitch P of bolt 3 ', non-standard screw-pitch Q ' in the present embodiment is the place's open loop row groove around bolt 3 ', and the length of Q ' can be greater than the length that also can be less than P.

Above embodiment is all that interval arranges non-standard screw-pitch between standard pitch P, increases the active force between thread contact face by the change of pitch, to play object that is fastening and sealing.The non-standard screw-pitch arranged between standard pitch P can arrange one, also can arrange multiple, when arranging multiple non-standard screw-pitch, the length of this multiple non-standard screw-pitch both can all be set to the length being greater than standard pitch, also the length being all less than non-standard screw-pitch can be set to, such as, slot between standard pitch in the 3rd embodiment, the length of groove is less than the length of standard pitch P.Or, length can be greater than these two kinds of modes of pitch that the pitch of standard pitch and length is less than standard pitch and combine, such as, in the second embodiment, be provided with W and R.

The form that the shape of screw thread adopts normal screw thread still to slot can be determined as required, as long as aforesaid way can be utilized to realize object that is fastening and sealing.

To dynamics be noted when linkage structure being outwarded winding from object to be connected, can not overexert and cause damage.

Screw connection structure of the present invention can Reusability, and can save pad and other locking equipment and encapsulation fitting, safe and efficient convenience.The present invention can be applicable to any use screw thread as connecting and having in the threaded connection of seal request.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. a screw connection structure, comprise: the screw thread connecting body and be arranged on described connection body, it is characterized in that, described screw thread is that formed by the continuous protruding structure with triangular cross-sectional shape, helically linear on described connection body surface continuous thread, described continuous thread has the first pitch of multiple standard pitch and at least one and described standard pitch different length, and described first pitch is not equal to the integral multiple of described standard pitch; Described first pitch and described standard pitch interval are arranged;

Wherein, the screw thread that described first pitch is the second pitch place and the screw thread at the 3rd pitch place are arranged side by side the 4th pitch that formed screw thread has, and described 4th pitch is described second pitch and described 3rd pitch sum, and be less than two described standard pitch sums, the length of wherein said second screw thread is greater than a described standard pitch, and being less than two described standard pitch sums, the length of described 3rd screw thread is less than a described standard pitch.

2. screw connection structure as claimed in claim 1, it is characterized in that, described connection body is bolt or pipe thread.