CN210343647U

CN210343647U - Connection structure and compressor

Info

Publication number: CN210343647U
Application number: CN201921188573.6U
Authority: CN
Inventors: 王军; 张利民; 武彦诚; 罗世龙; 朱正伟; 门显锋; 戴辉煌; 武殿成
Original assignee: China Shenhua Coal to Liquid Chemical Co Ltd; Ordos Coal to Liquid Branch of China Shenhua Coal to Liquid Chemical Co Ltd
Current assignee: China Shenhua Coal to Liquid Chemical Co Ltd; Ordos Coal to Liquid Branch of China Shenhua Coal to Liquid Chemical Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-04-17
Anticipated expiration: 2029-07-25

Abstract

The utility model relates to a fastening connection technical field discloses a connection structure and compressor. The first connecting piece 1 and the second connecting piece 2 are connected together through an external thread formed at the first end of the first connecting piece and an internal thread formed at the first end of the second connecting piece; the first connecting piece is spirally arranged on the external thread of the first end part of the first connecting piece through a locking piece and is positioned outside the end surface of the first end part of the second connecting piece 2; and then a plurality of pre-tightening units which are distributed along the circumferential direction of the locking piece and have the length extending direction parallel to the first direction of the axis of the external thread penetrate through the locking piece to abut against the first end part of the second connecting piece, so that pre-tightening force is applied to the thread pair between the first connecting piece and the second connecting piece. The problem that the pretightening force cannot reach the design standard and the connection of the first connecting piece and the second connecting piece cannot be effectively prevented from being loosened is solved.

Description

Connection structure and compressor

Technical Field

The utility model relates to a fastening connection technical field specifically relates to a connection structure and compressor.

Background

The existing reciprocating compressor has a mechanical nut connection mode and a hydraulic nut connection mode for connecting a piston rod cross and a character head; because the joint of the crosshead and the piston rod is the position of the whole compressor which is most easily damaged by alternating stress, the pretightening force of the connecting nut is very important, and the material is rapidly deformed due to overlarge pretightening force of the connecting nut; the pretightening force of the connecting nut is too small, so that the pretightening force disappears, and the nut is loosened. At present, provide the pretightning force through applying the moment of torsion to coupling nut, need adopt torque wrench to fasten coupling nut, because reciprocating compressor piston rod is nearer with cross head mechanical nut hookup location with the bent axle, can't adopt torque wrench to fasten coupling nut, can only adopt manual mode to fasten, lead to producing the pretightning force size that can't control coupling nut and apply, can not effectively prevent piston rod and the not hard up problem of cross head connection. This affects the long-term safe operation of the reciprocating compressor and thus there is a need for an improvement of the prior art connection.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the problem that can not effectively prevent that piston rod and cross head from being connected not hard up that prior art exists, providing a connection structure, this connection structure can utilize the moment spanner to apply required pretightning force, prevents effectively that piston rod and cross head from being connected not hard up. In order to achieve the above object, an aspect of the present invention provides a connection structure, including a first connection member, a second connection member, and a locking structure; the first connecting piece and the second connecting piece are connected together through an external thread formed at the first end part of the first connecting piece and an internal thread formed at the first end part of the second connecting piece; the locking structure comprises a locking piece and a plurality of pre-tightening units; the locking piece is spirally arranged on the external thread of the first end part of the first connecting piece and is positioned outside the end surface of the first end part of the second connecting piece; the plurality of pre-tightening units are distributed along the circumferential direction of the locking piece and can penetrate through the locking piece to abut against the first end portion of the second connecting piece, so that pre-tightening force is applied to the thread pair between the first connecting piece and the second connecting piece, and the length extension direction of each pre-tightening unit is a first direction parallel to the axis of the external thread.

Further, the pretensioning unit includes a first column having a length extending in the first direction, the first column being capable of passing through a first through-hole formed in the locker.

Further, the end part, facing away from the locking piece, of the first column comprises a first flange used for limiting the first column.

Furthermore, the first flange is provided with a second through hole which is perpendicular to the first direction and is used for penetrating the first anti-falling structure.

Further, the anti-loosening structure further comprises a fastening unit and a plate-shaped object, the length direction of the plate-shaped object is parallel to the first direction, and the plate-shaped object is fixedly connected with the first connecting piece and the second connecting piece through the plurality of fastening units.

Further, the fastening unit includes a second column having a length extending direction perpendicular to the first direction.

Furthermore, the protective device further comprises a protective unit, wherein the protective unit is arranged between the locking piece and the second connecting piece and sleeved on the external thread of the first end part of the first connecting piece.

Furthermore, the anti-loosening device further comprises a first anti-loosening structure for preventing the pre-tightening units of the anti-loosening structure from falling off, and the first anti-loosening structure can fasten the pre-tightening units together.

Further, the anti-loosening device further comprises a second anti-loosening structure for preventing the fastening units of the anti-loosening structure in the connecting structure from falling off, and the second anti-loosening structure can fasten the fastening units together.

The utility model discloses the second aspect provides a compressor, the compressor includes above connection structure.

Through the technical scheme, the first connecting piece and the second connecting piece are connected together through the external thread of the first end part of the first connecting piece and the internal thread of the first end part of the second connecting piece, and the locking piece is spirally arranged on the external thread of the first end part of the first connecting piece and positioned outside the end surface of the first end part of the second connecting piece; through on the retaining member circumference set up a plurality of length extending direction for the first direction and can pierce through the retaining member and support the pretension unit at the first end of second connecting piece and provide first connecting piece with the pretension that the second connecting piece needs. This kind of pretension instrument that sets up needs to use is shorter than the instrument that directly utilizes the retaining member to provide the pretightning force and need use, is favorable to carrying out the pretension in narrower and narrower space, has avoided because of the unable workspace of deepening of instrument, thereby can only rely on the manpower to carry out the pretension and lead to the pretightning force not to reach the design standard, can not effectively prevent first connecting piece and the second connecting piece to connect not hard up problem.

Drawings

FIG. 1 is a cross-sectional view of a connection structure according to an embodiment of the present invention;

fig. 2 is a left side view of fig. 1.

Description of the reference numerals

1-a first connector; 2-a second connector; 3-an anti-loose structure; 4-a protection unit; 31-a locking member; 311-a first via; 32-a pretensioning unit; 321-a first column; 322-a first flange; 323-second via hole; 33-a fastening unit; 34-a plate-like object; 35-a first anti-slip structure; 36-a first slot configuration; 5-a connecting rod; 6-connecting rod bearing bush; 7-pin shaft.

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

In the present invention, it is to be understood that the terms "away", "toward", "up", "down", "front", "back", "left", "right", and the like indicate orientations or positional relationships corresponding to orientations or positional relationships actually used; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; this is for convenience in describing the invention and for simplicity in description, and is not intended to indicate that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, a connecting structure includes a first connecting member 1, a second connecting member 2 and a loosening prevention structure 3; the first connecting piece 1 and the second connecting piece 2 are connected together through an external thread formed at the first end of the first connecting piece 1 and an internal thread formed at the first end of the second connecting piece 2; the anti-loose structure 3 comprises a locking piece 31 and a plurality of pre-tightening units 32; the locking piece 31 is spirally arranged on the external thread of the first end part of the first connecting piece 1 and is positioned outside the end surface of the first end part of the second connecting piece 2; the plurality of pre-tightening units 32 are circumferentially distributed along the locking member 31 and can penetrate through the locking member 31 to abut against the first end of the second connecting member 2, so that pre-tightening force is applied to the thread pair between the first connecting member 1 and the second connecting member 2, and the length extension direction of the pre-tightening units 32 is a first direction parallel to the axis of the external thread. This kind of pretension instrument that sets up needs to use is shorter than the instrument that directly utilizes retaining member 31 to provide the pretightning force and need use, is favorable to carrying out the pretension in narrower and narrower space, has avoided the instrument can't go deep into the workspace, thereby can only rely on the manpower to carry out the pretension and lead to the pretightning force to reach the design standard, can not effectively prevent first connecting piece and the not hard up problem of second connecting piece connection.

Preferably, the pretensioning units 32 are distributed uniformly in the circumferential direction of the locking element 31, so that a uniform force can be applied to the locking element 31. The pretensioning unit 32 may be a double number or a single number. In one embodiment shown in fig. 2, the pretensioning unit 32 is provided in 8.

Preferably, the pretensioning unit 32 includes a first column 321 having a length extending in the first direction, and the first column 321 can pass through a first through hole 311 formed on the locker 31. Further preferably, the first through hole 311 is a threaded hole, and the first column 321 is a stud. Therefore, the first column 321 can support against the first end part of the second connecting piece 2 after penetrating through the first through hole 311 in a screwing manner, and can simultaneously give a reverse force to the locking piece 31 and transmit the force to the fixed first connecting piece 1 by the pushing force of the second connecting piece 2, so that a pre-tightening force is exerted on a thread pair between the first connecting piece 1 and the second connecting piece 2.

Preferably, the end of the first column 321 facing away from the locking member 31 comprises a first flange 322 for limiting the position of the first column 321. The first flange 322 can limit the screwing depth of the first column 321 into the first through hole 311, and prevent the first column 321 from being pulled out from the first end of the locking member 31 close to the second connecting member 2 due to the screwing depth and further losing the pre-tightening effect.

Preferably, the first flange 322 is provided with a second through hole 323 having an axis perpendicular to the first direction for penetrating the first anti-dropping structure. For example, when the preload unit 32 is a high-strength hexagon head bolt, the second through hole 323 is formed in the hexagon head of the high-strength hexagon head bolt. Preferably, 3 second through holes 323 which are communicated with each other and distributed uniformly in the circumferential direction are formed in the hexagonal screw, wherein each second through hole 323 is perpendicular to two opposite surfaces of the 6 surfaces of the hexagonal screw, and the center line of the second through hole 323 intersects with the center line of the hexagonal screw. In this way, the first anti-slip structure 35 can be easily inserted into the pre-tightening unit 32 when the pre-tightening unit is screwed to any position.

Preferably, the anti-loose structure 3 further comprises a fastening unit 33 and a plate 34 with a length direction parallel to the first direction, and the plate 34 is fixedly connected with the first connecting piece 1 and the second connecting piece 2 simultaneously through a plurality of fastening units 33. The plate 34 includes a plurality of third through holes having axes perpendicular to the first direction for the second column to pass through, and it is further preferable that the third through holes have an oval cross section, so that the third through holes are arranged because the locking member 31 and the first end of the second connecting member 2 are displaced when the pre-tightening unit 32 is pre-tightened, resulting in a certain relative movement between the fastening unit 33 and the plate 34 in the first direction, and in order to adapt to the relative movement, the third through holes have an oval cross section. In order to fix the first connecting piece 1 and the second connecting piece 2 and the plate 34 together by the fastening unit 33, the first connecting piece 1 and the second connecting piece 2 are provided with threaded blind holes corresponding to a plurality of the third through holes to accommodate the fastening unit 33. The number of the fastening units 33 may be an even number or a singular number. In one embodiment shown in fig. 2, the fastening units 33 are provided in 4, two of which are used for connection with the first connecting element 1 and 2 of which are used for connection with the second connecting element 2.

Preferably, the fastening unit 33 includes a second column having a length extending direction perpendicular to the first direction. The second column is provided with an external thread, and the plate-shaped object 34 is fixed with the first connecting piece 1 and the second connecting piece 2 through the threaded connection of the second column and the threaded blind hole. The fastening unit 33 further includes a second flange fixed to one end of the second column, and a fourth through hole for penetrating the second anti-falling structure is formed in the second flange. The fastening unit 33 may be, for example, a high-strength hexagon head bolt, wherein fourth through holes are formed in a hexagon head of the high-strength hexagon head bolt, and preferably, 3 fourth through holes are formed in the hexagon head, wherein the fourth through holes penetrate through each other and are circumferentially distributed uniformly and perpendicular to 6 faces of the hexagon head, each fourth through hole is perpendicular to two oppositely-arranged faces of the 6 faces of the hexagon head, and a center line of each fourth through hole intersects with a center line of the hexagon head.

It will further be preferred that the first connector 1 is further provided with a first slot structure 36, and the second connector 2 is provided with a second slot structure corresponding to said first slot structure 36. The provision of the first groove structure 36 and the second groove structure facilitates on the one hand the processing and on the other hand the positioning of the first connecting part 1 and the second connecting part 2 during mounting.

Preferably, the protective device further comprises a protective unit 4, wherein the protective unit 4 is arranged between the locking member 31 and the second connecting member 2 and is sleeved on the external thread of the first end part of the first connecting member 1. The protection unit 4 may adopt various shapes of gaskets with high hardness, for example, a hardened and tempered gasket, which can resist the pressure from the first column 321 on one hand and protect the second connection member 2; on the other hand, the rotation resistance of the first column 321 can be reduced because the hardened and tempered pad has a high hardness, a smooth surface and a low friction coefficient.

Preferably, the locking device further comprises a first anti-dropping structure for preventing the pre-tightening unit 32 of the anti-loosening structure 3 from dropping, and the first anti-dropping structure can fasten a plurality of pre-tightening units 32 together.

The first anti-slip structure 35 may be, for example, a steel wire, as shown in fig. 2, which is inserted through the second through hole 323 in such a manner that a reverse torque can be applied to connect the plurality of pretensioning units 32 together, thereby preventing one or more of the pretensioning units 32 from slipping off.

Preferably, a second anti-dropping structure for preventing the fastening unit 33 of the anti-loosing structure 3 in the connecting structure from dropping is further included, and the second anti-dropping structure can fasten a plurality of the fastening units 33 together. In this way, the one or more fastening units 33 can be prevented from falling off.

The utility model discloses the second aspect provides a compressor, the compressor includes above connection structure. In the compressor in one embodiment, the first connecting member 1 is provided as a piston rod; the second connecting piece 2 is arranged as a crosshead, and the crosshead is connected with the connecting rod 5 through a pin shaft 7; thus, the piston rod drives the connecting rod 5 to operate; wherein, a wear-resistant connecting rod bearing bush 6 is arranged between the pin shaft 7 and the connecting rod 5.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical scheme of the utility model in the technical conception scope, can be right carry out multiple simple variant. Including any combination of specific features, which is not otherwise described herein, in order to avoid unnecessary repetition. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. A connecting structure is characterized by comprising a first connecting piece (1), a second connecting piece (2) and a locking structure (3); the first connecting piece (1) and the second connecting piece (2) are connected together through an external thread formed at the first end of the first connecting piece (1) and an internal thread formed at the first end of the second connecting piece (2); the anti-loosening structure (3) comprises a locking piece (31) and a plurality of pre-tightening units (32); the locking piece (31) is spirally arranged on the external thread of the first end part of the first connecting piece (1) and is positioned outside the end surface of the first end part of the second connecting piece (2); the plurality of pre-tightening units (32) are distributed along the circumferential direction of the locking piece (31) and can penetrate through the locking piece (31) to abut against the first end portion of the second connecting piece (2), so that pre-tightening force is applied to a thread pair between the first connecting piece (1) and the second connecting piece (2), and the length extension direction of the pre-tightening units (32) is a first direction parallel to the axis of the external thread.

2. The connecting structure according to claim 1, wherein the pretensioning unit (32) comprises a first column (321) having a length extending in the first direction, the first column (321) being capable of passing through a first through-hole (311) formed on the locker (31).

3. The connection according to claim 2, characterized in that the end of the first column (321) facing away from the retaining member (31) comprises a first flange (322) for retaining the first column (321).

4. The connection structure according to claim 3, wherein the first flange (322) is provided with a second through hole (323) having an axis perpendicular to the first direction for passing through the first retaining structure.

5. The connection structure according to any one of claims 1 to 4, wherein the loosening prevention structure (3) further comprises a fastening unit (33) and a plate (34) having a length direction parallel to the first direction, and the plate (34) is fixedly connected to the first connection member (1) and the second connection member (2) simultaneously by a plurality of the fastening units (33).

6. The connection according to claim 5, characterized in that the fastening unit (33) comprises a second column, the length extension direction of which is perpendicular to the first direction.

7. The connection according to any one of claims 1 to 4 and 6, further comprising a protection unit (4), wherein the protection unit (4) is arranged between the locking member (31) and the second connecting member (2) and is sleeved on the external thread of the first end of the first connecting member (1).

8. The connecting structure according to claim 7, further comprising a first coming-off prevention structure for preventing the pre-tightening unit (32) of the loosening prevention structure (3) from coming off, the first coming-off prevention structure being capable of fastening a plurality of the pre-tightening units (32) together.

9. The connecting structure according to claim 7, further comprising a second retaining structure for preventing a fastening unit (33) of the loosening prevention structure (3) in the connecting structure from coming off, the second retaining structure being capable of fastening a plurality of the fastening units (33) together.

10. A compressor, characterized by comprising a connection structure according to any one of claims 1 to 9.