CN108180208B - One-way anti-dismantling pipe nut, anti-dismantling pipe joint device and air conditioner - Google Patents
One-way anti-dismantling pipe nut, anti-dismantling pipe joint device and air conditioner Download PDFInfo
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- CN108180208B CN108180208B CN201711474636.XA CN201711474636A CN108180208B CN 108180208 B CN108180208 B CN 108180208B CN 201711474636 A CN201711474636 A CN 201711474636A CN 108180208 B CN108180208 B CN 108180208B
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- wrench
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- edge
- curved surface
- wrench clamping
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- 239000003507 refrigerant Substances 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims description 13
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000002265 prevention Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000003811 finger Anatomy 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000003813 thumb Anatomy 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
Abstract
The invention provides a one-way anti-dismantling pipe connecting nut, an anti-dismantling pipe connecting device and an air conditioner. The one-way anti-dismounting connecting pipe nut is provided with a first end for connecting a pipe joint and a second end for connecting a connecting pipe, the outer side surface of the first end is a cylindrical surface, the whole outer side surface of the second end is the cylindrical surface, at least one pair of oppositely arranged and mutually parallel wrench clamping surfaces are formed on the outer side surface of the second end, the top end of each wrench clamping surface penetrates through the end surface of the second end, and the width of the top end of each wrench clamping surface is larger than zero; the wrench clamping surface is provided with a forward stress straight line edge which is in line contact with the wrench when the wrench is screwed, the wrench clamping surface and a cylindrical surface adjacent to the wrench clamping surface along the unscrewing direction form a curved surface which is concave relative to the extension surface of the wrench clamping surface and the extension surface of the cylindrical surface, and the curved surface is provided with a reverse stress curve edge or a fillet curved surface which is in point contact with the wrench when the wrench is screwed, so that the wrench can better clamp the adapter nut when the wrench is screwed, and the reverse anti-dismounting purpose is achieved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a one-way anti-dismantling pipe connecting nut, an anti-dismantling pipe connecting device and an air conditioner.
Background
At present, due to the requirement of environmental protection, the air-conditioning refrigerant is gradually switched into R290 and R32 refrigerants with strong flammability. In order to prevent safety accidents, the state requires that air conditioners using such refrigerants cannot be detached by unskilled persons at will.
However, in the existing pipe joint device adopting the pipe joint and the pipe joint nut to be matched with the connecting pipeline, the pipe joint nut can be normally screwed in the forward direction and can also be unscrewed in the reverse direction, and the national requirement on the disassembly prevention of the refrigerant pipeline cannot be met.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, a first aspect of the invention aims to provide a one-way tamper evident tube nut.
It is an object of a second aspect of the present invention to provide a pipe joint device including the above one-way pipe nut.
A third aspect of the present invention is to provide an air conditioner including the above pipe joint removal prevention device.
In order to achieve the above object, a technical solution of a first aspect of the present invention provides a one-way anti-detachment pipe connection nut, where the pipe connection nut has a first end for connecting a pipe joint and a second end for connecting a pipe connection, an outer side surface of the first end is a cylindrical surface, an entire outer side surface of the second end is a cylindrical surface, and at least one pair of wrench clamping surfaces which are arranged oppositely and parallel to each other are formed on the outer side surface of the second end, a top end of the wrench clamping surface penetrates through an end surface of the second end, and a top end width of the wrench clamping surface is greater than zero; the wrench clamping surface is provided with a straight line edge stressed in the forward direction and used for being in line contact with a wrench when the wrench is screwed, a curved surface which is concave relative to an extension surface of the wrench clamping surface and an extension surface of a cylindrical surface is formed between the wrench clamping surface and the cylindrical surface adjacent to the wrench clamping surface along the unscrewing direction, and a curved edge stressed in the reverse direction or a curved surface with a radius angle and used for being in point contact with the wrench when the wrench is unscrewed is formed on the curved surface.
Generally speaking, the screwing means clockwise screwing, the unscrewing means anticlockwise screwing, the screwing direction of the adapter nut conforms to the right-hand rule, a fist is held by the right hand, the thumb of the right hand points to the movement direction of the adapter nut, and the other four fingers point to the rotation direction of the adapter nut.
According to the one-way anti-disassembly connecting pipe nut provided by the technical scheme, at least one pair of wrench clamping surfaces which are oppositely arranged and are parallel to each other is formed on the outer side surface of the connecting end of the connecting pipe nut and the connecting pipe, so that the wrench can better clamp the connecting pipe nut when being screwed; specifically, when the adapter nut is screwed forward, only a common adjustable wrench or a common fixed wrench needs to be used, the wrench is in line contact with two forward stressed straight line edges formed on the clamping surfaces of the oppositely arranged wrenches along the screwing direction, and the wrench applies screwing torque to the adapter nut so as to lock the pipe joint and the adapter nut; once the wrench is screwed to a certain degree and then reversely unscrewed, because the reverse stress straight line edge originally used for being in line contact with the wrench on the wrench clamping surface is processed by the curved surface formed between the wrench clamping surface and the cylindrical surface adjacent to the wrench along the unscrewing direction, the wrench can only be in point contact (preferably one point contact) with the reverse stress curve edge formed on the curved surface or the fillet curved surface formed by rounding the reverse stress curve edge along the unscrewing direction, the wrench is easy to slip outwards when applying force, effective unscrewing torque can not be applied to the pipe nut through the wrench, so that the pipe nut can not be reversely unscrewed through the wrench, the reverse anti-disassembly purpose is achieved, and the anti-disassembly requirement of the flammable refrigerant connecting pipeline is met.
In addition, the one-way anti-dismantling pipe nut provided by the technical scheme of the invention can also have the following additional technical characteristics:
in the above technical scheme, at least a portion of a side edge of the wrench clamping surface, which is opposite to the forward force-bearing linear edge, near the second end surface is a linear edge parallel to the forward force-bearing linear edge, and the width of the top end of the wrench clamping surface is less than or equal to the vertical distance between the forward force-bearing linear edge and the projection of the central axis of the adapter nut on the wrench clamping surface.
The side edge of the wrench clamping surface opposite to the forward stress straight line edge comprises at least one section of straight line edge, preferably, the side edge of the wrench clamping surface opposite to the forward stress straight line edge is a straight line edge parallel to the forward stress straight line edge, so that the wrench clamping surface can be kept to have a larger area, and the wrench can better clamp the connecting pipe nut during screwing; in order to achieve the effect of preventing reverse unscrewing, the width of the top end of the wrench clamping surface is required to be smaller than or equal to the vertical distance between the projection of the straight line edge of the forward force-bearing edge and the central axis of the adapter nut on the wrench clamping surface, that is, one half or more than half of the original wrench clamping surface is also required to be processed by a curved surface, so that when the wrench is clamped on the wrench clamping surface to be unscrewed, the wrench can slide outwards along the curved surface, and the wrench can not be clamped on the wrench clamping surface to be unscrewed reversely.
In the above technical solution, a side edge of the wrench clamping surface opposite to the forward force-bearing straight line edge is a curved edge.
The side edge of the wrench clamping surface, which is opposite to the straight line edge stressed in the positive direction, is a curved edge, and the wrench can only be in point contact with the curved edge or is not in contact with the curved edge, so that when the wrench is clamped on the wrench clamping surface for unscrewing, the wrench can slip outwards along the curved surface, and the wrench cannot be clamped on the wrench clamping surface for reverse unscrewing; compared with the scheme that the side edge of the wrench clamping surface opposite to the forward stress straight line edge is processed into the straight line edge, the scheme that the side edge of the wrench clamping surface opposite to the forward stress straight line edge is processed into the curved line edge can increase the area of the wrench clamping surface properly, so that the wrench can clamp the connecting pipe nut better when being screwed down.
In any of the above technical solutions, the joint between the wrench clamping surface and the cylindrical surface connected to the wrench clamping surface along the screwing direction forms the positive stress straight line edge; the curved surface and the connecting position of the cylindrical surface connected with the curved surface along the unscrewing direction form the reverse stress curve edge or the reverse stress curve edge is subjected to rounding treatment to form the rounding curved surface.
When the adapter nut is screwed forward, the wrench is in line contact with a forward force-bearing straight line edge formed at the joint of the wrench clamping surfaces and the cylindrical surface connected with the wrench clamping surfaces along the screwing direction, and the distance between the two wrench clamping surfaces which are oppositely arranged and parallel to each other is smaller than the diameter of the cylindrical surface, so that the opening width of the wrench during screwing is smaller than the diameter of the cylindrical surface, the wrench can apply effective screwing torque to the adapter nut, and the pipe joint and the adapter nut are locked; once the connecting pipe nut is screwed to a certain degree and then reversely unscrewed, the wrench is only in point contact with a reverse stress curve edge or a chamfered curved surface formed at the joint of the curved surface and the cylindrical surface connected with the curved surface along the unscrewing direction, so that the wrench is easy to slip outwards when applying force, and effective screwing torque can not be applied to the connecting pipe nut through the wrench, therefore, the connecting pipe nut can not be reversely unscrewed through the wrench, and the aim of reversely preventing disassembly is fulfilled.
In any of the above technical solutions, the positive force-receiving straight line side is parallel to the central axis of the adapter nut; the reverse stress curve edge or the rounded curved surface gradually extends towards the end face direction of the second end along the unscrewing direction.
The straight line edge stressed positively is parallel to the central axis of the adapter nut, so that a wrench can apply a screwing force perpendicular to the central axis of the adapter nut to the adapter nut, the adapter nut can be screwed with relatively small force, and a certain included angle can be formed between the straight line edge and the central axis of the adapter nut; once the wrench is screwed to a certain degree and then reversely unscrewed, the wrench is only in point contact with a reverse stress curve edge or a chamfered curved surface formed on the curved surface, and the reverse stress curve edge or the chamfered curved surface gradually extends towards the end face direction of one end of the connection pipe nut and the connection pipe along the unscrewing direction, so that the wrench and the reverse stress curve edge are only in point contact, the wrench is easy to slip outwards when applying force, effective screwing torque can not be applied to the connection pipe nut through the wrench, the connection pipe nut can not be reversely unscrewed through the wrench, and the purpose of reversely preventing disassembly is achieved.
In any of the above technical solutions, the top end of the curved surface gradually converges toward the central axis direction of the adapter nut along the unscrewing direction relative to the bottom end of the curved surface.
The bottom of the relative curved surface in top of curved surface is along the unscrewing direction gradually to the direction convergence of the axis that is close to the takeover nut, makes the spanner have no effort point with this curved surface when the unscrewing on the one hand, and the slippage is outwards easy to reach the reverse purpose of preventing tearing open, and the curved surface nonparallel of two relative indents of on the other hand makes the unable card of spanner dismantle on two curved surfaces of takeover nut, further reaches to prevent tearing open the purpose.
In any of the above technical solutions, a step surface for the wrench to abut against is formed between the bottom end of the wrench clamping surface and the outer side surface of the first end and between the bottom end of the curved surface and the outer side surface of the wrench clamping surface.
Preferably, the diameter of the cylindrical surface formed by the outer side surface of the first end is larger than or equal to the diameter of the cylindrical surface formed by the outer side surface of the second end; because the wrench clamping surface and the curved surface are both concave relative to the cylindrical surface, step surfaces for the wrench to abut against are formed between the bottom end of the wrench clamping surface and the outer side edge of the bottom end and the first end of the curved surface, and the step surfaces are used for limiting the fixed position of the wrench, so that the wrench cannot exceed the step surfaces, and the wrench can apply effective screwing torque to the pipe nut.
In any of the above technical solutions, one, two or more pairs of wrench clamping surfaces that are arranged oppositely and parallel to each other are formed on the outer side surface of the second end, and the adapter nut is rotationally symmetric around the central axis thereof.
One pair, two pairs or more pairs of wrench clamping surfaces can be processed on the outer side surface of the connecting end of the connecting pipe nut and the connecting pipe according to the specific size of the connecting pipe nut, so that the wrench can clamp the connecting pipe nut from multiple angles, and the convenience of assembling the connecting pipe nut is improved; preferably, the adapter nut is rotationally symmetrical by taking the central axis of the adapter nut as a center, so that the structural symmetry of the adapter nut is better, the structural strength of the adapter nut is improved, and the adapter nut is more convenient to assemble.
The technical solution of the second aspect of the present invention provides a pipe joint removal preventing device, including: a pipe joint; and the adapter nut is the one-way anti-disassembly adapter nut in any technical scheme.
According to the anti-dismantling pipe joint device provided by the technical scheme, the pipe joint and the connecting pipe nut are connected with the pipeline, and the pipe joint and the connecting pipe nut can be screwed down only by using a common adjustable wrench or a fixed wrench; after the coupling is screwed up with the takeover nut, because the special construction of takeover nut, can't exert effectual reverse unscrewing moment to the takeover nut through the spanner to reach the reverse purpose of preventing tearing open, guarantee the non-detachability of coupling and takeover nut, avoid because of the mistake dismantlement lead to the emergence of the accident of revealing such as refrigerant in the pipeline, simple structure, convenient operation, processing and installation cost are low.
A third aspect of the present invention provides an air conditioner, including: the outdoor unit is connected with a first connecting pipe for circulation of refrigerant; and the indoor unit is connected with a second connecting pipe for refrigerant circulation, and the first connecting pipe and the second connecting pipe are connected through the anti-dismantling pipe connecting device in the technical scheme.
The air conditioner provided by the technical scheme of the invention has the beneficial effects of the anti-disassembly pipe connecting device in the technical scheme because the air conditioner comprises the anti-disassembly pipe connecting device in the technical scheme, and the details are not repeated.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic perspective view of a one-way tamper evident tube nut according to one embodiment of the present invention;
FIG. 2 is a side view of the one-way tamper evident tube nut of FIG. 1;
FIG. 3 is a schematic top view of the one-way tamper evident tube nut of FIG. 1;
FIG. 4 is a schematic sectional view taken along line A-A in FIG. 3;
FIG. 5 is a schematic perspective view of a one-way tamper evident tube nut according to another embodiment of the present invention;
FIG. 6 is a side view of the one-way tamper evident tube nut of FIG. 5;
FIG. 7 is a schematic top view of the one-way tamper evident tube nut of FIG. 5;
fig. 8 is a schematic sectional view along the direction B-B in fig. 7.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:
1, connecting a pipe nut, 10 assembling holes, 11 internal threads, 12 conical hole wall surfaces, 13 cylindrical surfaces, 14 cylindrical surfaces, 15 wrench clamping surfaces, 16 forward stress straight line edges, 17 curved surfaces, 18 reverse stress curve edges, 19 end surfaces and 20 step surfaces;
the curved arrows in fig. 3 and 7 indicate the screwing direction, and the opposite direction of the curved arrows indicates the unscrewing direction.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
A one-way tamper evident coupling nut, a tamper evident coupling device, and an air conditioner according to some embodiments of the present invention will be described with reference to fig. 1 to 8.
As shown in fig. 1 to 8, according to some embodiments of the present invention, there is provided a one-way anti-detachment union nut, the union nut 1 has a first end for connecting a pipe joint and a second end for connecting a union, an outer side surface of the first end is a cylindrical surface 13, an entire outer side surface of the second end is a cylindrical surface 14, and at least one pair of wrench locking surfaces 15 which are oppositely arranged and parallel to each other is formed on the outer side surface of the second end, a top end of the wrench locking surface 15 penetrates through an end surface 19 of the second end, and a top width of the wrench locking surface 15 is greater than zero; the wrench stop surface 15 is formed with a straight edge 16 for a forward force to make a line contact with the wrench when screwing (the curved arrow shown in fig. 3 and 7 indicates the screwing direction), a curved surface 17 which is concave relative to the extension surface of the wrench stop surface 15 and the extension surface of the cylindrical surface 14 is formed between the wrench stop surface 15 and the cylindrical surface 14 adjacent to the wrench stop surface in the unscrewing direction, and a curved edge 18 for a reverse force to make a point contact with the wrench when unscrewing (the reverse direction of the curved arrow shown in fig. 3 and 7 indicates the unscrewing direction) or a rounded curved surface is formed on the curved surface 17.
Generally speaking, the screwing means clockwise screwing, the unscrewing means counterclockwise screwing, the screwing direction of the adapter nut 1 conforms to the right-hand rule, the fist is held by the right hand, the thumb of the right hand points to the movement direction of the adapter nut 1, and the other four fingers point to the rotation direction of the adapter nut 1.
In the one-way anti-disassembly pipe nut provided by the embodiment of the invention, at least one pair of wrench clamping surfaces 15 which are oppositely arranged and are parallel to each other is formed on the outer side surface of the connecting end of the pipe nut 1 and the connecting pipe, so that the wrench can better clamp the pipe nut 1 when being screwed; specifically, when the adapter nut 1 is positively screwed, only a common adjustable wrench or a common fixed wrench needs to be used, the wrench is in line contact with two positively stressed linear edges 16 formed on the oppositely arranged wrench clamping surfaces 15 along the screwing direction, and the wrench applies screwing torque to the adapter nut 1 to lock the pipe joint and the adapter nut 1; once the pipe nut 1 is screwed to a certain degree and then reversely unscrewed, because the reverse stress straight line edge originally used for line contact with the wrench on the wrench clamping surface 15 is processed by the curved surface 17 formed between the wrench clamping surface 15 and the cylindrical surface 14 adjacent to the wrench clamping surface along the unscrewing direction, the wrench can only perform point contact (preferably one point contact) with the reverse stress curve edge 18 formed on the curved surface 17 or the fillet curved surface formed by rounding the reverse stress curve edge 18 along the unscrewing direction, the wrench is easy to slip outwards when applying force, and effective unscrewing torque can not be applied to the pipe nut 1 through the wrench, so that the pipe nut 1 can not be reversely unscrewed through the wrench, the purpose of reverse anti-disassembly is achieved, and the requirement of anti-disassembly of the flammable refrigerant pipe connecting pipeline is met.
Specifically, as shown in fig. 4 and 8, an assembly hole 10 running through in the axial direction is formed in the adapter nut 1, an internal thread 11 is arranged at the assembly hole 10 at the end where the adapter nut 1 is connected with the pipe joint and is used for being in threaded connection with an external thread of the pipe joint, and a tapered hole wall surface 12 is arranged at the assembly hole 10 at the end where the adapter nut 1 is connected with the adapter and is used for being in butt fit with the adapter of the bell mouth; as shown in fig. 1 and 5, the outer side surface of the connection end of the adapter nut 1 and the pipe joint is a cylindrical surface 13, and a screwing torque cannot be applied to the connection end by a wrench; the outer side surface of one end, connected with the connecting pipe, of the connecting pipe nut 1 is a cylindrical surface 14 in whole, a forward stressed straight line edge 16 used for being in line contact with a wrench along the screwing direction and a reverse stressed curved edge 18 or a chamfered curved surface used for being in point contact with the wrench along the unscrewing direction are formed on the outer side surface of one end, connected with the connecting pipe, of the connecting pipe nut 1, and a forward screwing torque can be applied to the position through the wrench, but a reverse unscrewing torque cannot be applied to the position.
Preferably, as shown in fig. 1 and 5, the entire outer side surface of the nipple nut 1 is a cylindrical surface, and it is also possible to design that the outer diameter of the first end of the nipple nut 1 is larger than that of the second end, and a step is formed at the connection position of the first end and the second end of the nipple nut 1.
Preferably, the nipple nut 1 is a copper nut.
In an embodiment of the present invention, as shown in fig. 1, fig. 2, fig. 5, and fig. 6, at least a portion of a side edge of the wrench locking surface 15 opposite to the forward force-receiving linear edge 16 near the second end surface is a linear edge parallel to the forward force-receiving linear edge 16, and a width a of a top end of the wrench locking surface 15 is less than or equal to a vertical distance b between the forward force-receiving linear edge 16 and a projection of a central axis of the union nut 1 on the wrench locking surface 15.
As shown in fig. 2, a represents the width of the top end of the wrench catch face 15; as shown in fig. 3, b represents the vertical distance between the straight edge 16, which is subjected to a positive force, and the projection of the central axis of the union nut 1 on the wrench locking surface 15.
The side edge of the wrench clamping surface 15 opposite to the forward stress straight line edge 16 comprises at least one section of straight line edge, preferably, the side edge of the wrench clamping surface 15 opposite to the forward stress straight line edge 16 is a straight line edge parallel to the forward stress straight line edge 16, and the design can keep the wrench clamping surface 15 to have a large area, so that the wrench can better clamp the adapter nut 1 during screwing; in order to achieve the effect of preventing the reverse unscrewing, it is necessary to ensure that the width of the top end of the wrench clamping surface 15 is less than or equal to the vertical distance between the straight edge of the forward force-bearing edge and the projection of the central axis of the adapter nut 1 on the wrench clamping surface 15, that is, to ensure that half or more of the original wrench clamping surface 15 is machined away by the curved surface 17, so that when the wrench is clamped on the wrench clamping surface 15 to unscrew, the wrench can slip outwards along the curved surface 17, and thus the wrench cannot be clamped on the wrench clamping surface 15 to unscrew reversely.
In another embodiment of the present invention, the side of the wrench locking surface 15 opposite to the straight line side 16 is a curved side.
The side edge of the wrench clamping surface 15 opposite to the forward force-bearing straight line edge 16 is a curved edge, and the wrench is ensured to be only capable of carrying out one point contact with the curved edge or not to be in contact with the curved edge, so that when the wrench is clamped on the wrench clamping surface 15 to be unscrewed, the wrench can slide outwards along the curved surface 17, and the wrench cannot be clamped on the wrench clamping surface 15 to be unscrewed reversely; compared with the scheme that the side edge of the wrench clamping surface 15 opposite to the forward stress straight line edge 16 is processed into the straight line edge, the scheme that the side edge of the wrench clamping surface 15 opposite to the forward stress straight line edge 16 is processed into the straight line edge can increase the area of the wrench clamping surface 15 properly, so that the wrench can clamp the adapter nut 1 better during screwing.
In some embodiments of the invention, as shown in fig. 1 and 5, the junction between the wrench locking surface 15 and the cylindrical surface 14 connected thereto in the tightening direction forms a straight positively stressed edge 16; the curved surface 17 and the cylindrical surface 14 connected with the curved surface along the unscrewing direction form a reverse stress curve edge 18 or the reverse stress curve edge 18 is rounded to form a rounded curved surface.
When the adapter nut 1 is screwed forward, the wrench is in line contact with a forward force-bearing linear edge 16 formed at the joint of the wrench clamping surface 15 and the cylindrical surface 14 connected with the wrench clamping surface along the screwing direction, and the distance between the two wrench clamping surfaces 15 which are oppositely arranged and parallel to each other is smaller than the diameter of the cylindrical surface 14, so that the opening width of the wrench during screwing is smaller than the diameter of the cylindrical surface 14, the wrench can apply effective screwing torque to the adapter nut 1, and the pipe joint and the adapter nut 1 are locked; once the pipe nut 1 is screwed down to a certain degree and then reversely unscrewed, the wrench is only in point contact with the curved surface 17 and the reverse stress curve edge 18 or the chamfered curved surface formed at the joint of the cylindrical surface 14 connected with the curved surface along the unscrewing direction, so that the wrench is easy to slip outwards when applying force, effective screwing torque can not be applied to the pipe nut 1 through the wrench, the pipe nut 1 can not be unscrewed reversely through the wrench, and the purpose of reversely preventing disassembly is achieved.
Preferably, as shown in fig. 2 and 6, the positively-stressed straight edge 16 is parallel to the central axis of the nipple nut 1; the reverse force curve edge 18 or the rounded curved surface gradually extends towards the end surface 19 of the second end along the unscrewing direction.
The forward force-bearing linear edge 16 is parallel to the central axis of the adapter nut 1, so that a screwing force perpendicular to the central axis of the adapter nut 1 can be conveniently applied to the adapter nut 1 through a wrench, the purpose of screwing the adapter nut 1 with relatively small force is achieved, and a certain included angle can be formed between the linear edge and the central axis of the adapter nut 1; once the pipe nut is screwed to a certain degree and then reversely unscrewed, the wrench is only in point contact with the reverse stress curve edge 18 or the fillet curved surface formed on the curved surface 17, and the reverse stress curve edge 18 or the fillet curved surface gradually extends towards the end face direction of one end, connected with the connecting pipe, of the connecting pipe nut 1 along the unscrewing direction, so that the wrench and the reverse stress curve edge 18 are only in point contact, the wrench is easy to slip outwards when applying force, effective screwing torque cannot be applied to the connecting pipe nut 1 through the wrench, the connecting pipe nut 1 cannot be unscrewed reversely through the wrench, and the purpose of reversely preventing disassembly is achieved.
Further preferably, as shown in fig. 1, 3, 5 and 7, the top end of the curved surface 17 gradually converges toward the central axis of the union nut 1 in the unscrewing direction with respect to the bottom end of the curved surface 17.
The bottom of the relative curved surface 17 in top of curved surface 17 is along the unscrewing direction and is being close to the direction convergence of the axis of taking over nut 1 gradually, makes the spanner have no effort point with this curved surface 17 when the unscrewing on the one hand, and the slippage is outwards easy to reach the reverse purpose of preventing tearing open, and the curved surface 17 nonparallel of two relative indents of on the other hand makes the spanner can't block and dismantle on taking over two curved surfaces 17 of nut 1, further reaches the purpose of preventing tearing open.
Preferably, the curved surface 17 is formed by processing the curved surface 17, wherein the curved surface is an extension of the wrench locking surface 15 and an extension of the cylindrical surface 14 adjacent to the wrench locking surface in the unscrewing direction.
During specific processing, the whole outer side surface of the adapter nut 1 can be processed into a cylindrical surface 14, then two wrench clamping surfaces 15 which are oppositely arranged and are parallel to each other are processed on the outer side surface of the end, connected with the adapter, of the adapter nut 1, and a linear positive stress edge is formed at the joint of the wrench clamping surfaces 15 and the cylindrical surface 14 connected with the wrench clamping surfaces along the screwing direction and is used for clamping the wrench to screw positively; then, a curved surface 17 is processed on the wrench clamping surface 15 and the cylindrical surface 14 connected with the wrench clamping surface in the loosening direction, and a reverse stress straight line edge formed at the joint of the wrench clamping surface 15 and the cylindrical surface 14 connected with the wrench clamping surface in the loosening direction is processed when the curved surface 17 is processed, namely, the reverse stress straight line edge originally used for line contact with the wrench on the wrench clamping surface 15 is cut off by processing the curved surface 17 and is replaced by the curved surface 17 formed between the wrench clamping surface 15 and the cylindrical surface 14 adjacent to the wrench clamping surface in the loosening direction, so that a curved reverse stress edge is formed at the joint of the curved surface 17 and the cylindrical surface 14 connected with the wrench clamping surface in the loosening direction, and the wrench can only carry out point contact (preferably one point contact) with a reverse stress curve edge 18 formed on the curved surface 17 or a round-chamfered curved surface formed by rounding the reverse stress curve edge 18 in the loosening direction, the spanner is easy to outwards slip when force is applied, effective unscrewing torque can not be applied to the pipe nut 1 through the spanner butt joint, the reverse anti-dismounting purpose is achieved, the purposes of forward screwing and reverse unscrewing can be achieved, the structure is simple, and machining is convenient.
In some embodiments of the present invention, as shown in fig. 1, 3, 5 and 7, a step surface 20 for the wrench to abut is formed between the bottom end of the wrench locking surface 15 and the bottom end of the curved surface 17 and the outer side surface of the first end.
Preferably, the diameter of the cylindrical surface 14 formed by the outer side surface of the first end is greater than or equal to the diameter of the cylindrical surface 14 formed by the outer side surface of the second end; because the wrench clamping surface 15 and the curved surface 17 are both concave relative to the cylindrical surface 14, a step surface 20 for the wrench to abut against is formed between the bottom end of the wrench clamping surface 15 and the outer side edge of the bottom end and the first end of the curved surface 17, and the step surface 20 is used for limiting the fixed position of the wrench, so that the wrench cannot exceed the step surface 20, and the wrench can apply effective screwing torque to the pipe nut 1.
In some embodiments of the present invention, as shown in fig. 3 and 7, one, two or more pairs of wrench clamping surfaces 15 are formed on the outer side surface of the second end, and the union nut 1 is rotationally symmetric around the central axis thereof.
One pair, two pairs or more pairs of wrench clamping surfaces 15 can be processed on the outer side surface of the connecting end of the connecting pipe nut 1 and the connecting pipe according to the specific size of the connecting pipe nut 1, so that the wrench can clamp the connecting pipe nut 1 from multiple angles, and the convenience of assembling the connecting pipe nut 1 is improved; preferably, the adapter nut 1 is rotationally symmetrical around the central axis thereof, so that the structural symmetry of the adapter nut 1 is better, the structural strength of the adapter nut 1 is improved, and the assembly of the adapter nut 1 is more convenient.
In one embodiment of the present invention, as shown in fig. 1 to 4, a pair of wrench locking surfaces 15 are formed on the outer side surface of the connection end of the nipple nut 1 and the nipple, the wrench locking surfaces being opposite to each other and parallel to each other.
In a second embodiment of the present invention, as shown in fig. 5 to 8, two pairs of wrench locking surfaces 15 are formed on the outer side surface of the connection end of the union nut 1 and the union, wherein the wrench locking surfaces are arranged oppositely and parallel to each other, and preferably, the union nut 1 is rotationally symmetric around the central axis thereof, i.e. the two pairs of wrench locking surfaces 15 are uniformly distributed on the outer side surface of the union nut 1, so as to improve the convenience of assembling the union nut 1 and balance the stress of the union nut 1.
An embodiment of a second aspect of the present invention provides a pipe joint removal prevention device including: the pipe joint and the connecting pipe nut 1, the connecting pipe nut 1 is the one-way anti-dismounting connecting pipe nut of any one of the above embodiments.
According to the anti-dismantling pipe joint device provided by the embodiment of the invention, the pipe joint and the connecting pipe nut 1 are connected with a pipeline, and the pipe joint and the connecting pipe nut 1 can be screwed down only by using a common adjustable wrench or a fixed wrench; after the coupling is screwed up with takeover nut 1, because takeover nut 1's special construction, can't exert effectual reverse unscrewing moment to takeover nut 1 through the spanner to reach the reverse purpose of preventing tearing open, guarantee the non-detachability of coupling and takeover nut 1, avoid because of the mistake dismantlement lead to the emergence of the interior refrigerant of pipeline etc. the accident of revealing, simple structure, convenient operation, processing and installation cost are low.
An embodiment of a third aspect of the present invention provides an air conditioner (not shown in the drawings) comprising: the outdoor unit is connected with a first connecting pipe for the circulation of refrigerant, the indoor unit is connected with a second connecting pipe for the circulation of refrigerant, and the first connecting pipe and the second connecting pipe are connected through the anti-dismantling pipe connecting device in the embodiment.
The air conditioner provided by the above embodiment of the present invention includes the anti-disassembly pipe connecting device according to the above embodiment, so that the air conditioner has the beneficial effects of the anti-disassembly pipe connecting device according to the above embodiment, and further description is omitted here.
In summary, in the one-way anti-detachment union pipe nut provided by the embodiment of the present invention, at least one pair of wrench clamping surfaces which are oppositely arranged and parallel to each other is formed on the outer side surface of the union pipe nut at the end connected with the union pipe, so that the wrench can better clamp the union pipe nut when being tightened; specifically, when the pipe joint is screwed forward, only a common adjustable wrench or a common fixed wrench is needed to be used, the wrench is in line contact with two forward stressed straight line edges formed on the clamping surfaces of the oppositely arranged wrenches along the screwing direction, and the pipe joint nut are locked by applying screwing torque to the pipe joint nut through the wrench; in case screw up to the certain degree when reverse unscrewing again, the spanner only can carry out the point contact along the unscrewing direction with the reverse atress curve limit that forms on the curved surface or carry out the radius angle curved surface that the radius angle was handled and is formed to reverse atress curve limit, and the spanner outwards slippage easily when the application of force can't apply effectual unscrewing moment to the coupling pipe nut through the spanner, reaches the reverse purpose of preventing tearing open, satisfies easily fires refrigerant and takes over the requirement that the pipeline was prevented tearing open.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, e.g., "connected" may be a fixed connection, a detachable connection, an integral connection, or an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A one-way anti-disassembly nipple nut having a first end for connection to a pipe connection and a second end for connection to a nipple,
the outer side surface of the first end is a cylindrical surface, the whole outer side surface of the second end is a cylindrical surface, at least one pair of wrench clamping surfaces which are oppositely arranged and are parallel to each other is formed on the outer side surface of the second end, the top end of each wrench clamping surface penetrates through the end surface of the second end, and the width of the top end of each wrench clamping surface is larger than zero;
a forward force-bearing straight line edge used for being in line contact with a wrench during screwing is formed on the wrench clamping surface, a curved surface which is concave relative to an extension surface of the wrench clamping surface and an extension surface of a cylindrical surface is formed between the wrench clamping surface and the cylindrical surface adjacent to the wrench clamping surface along the unscrewing direction, and a reverse force-bearing curved edge or a fillet curved surface used for being in point contact with the wrench during unscrewing is formed on the curved surface;
the side edge of the wrench clamping surface opposite to the straight line edge stressed in the positive direction is a curved edge.
2. The one-way tamper evident tube nut of claim 1,
the joint of the wrench clamping surface and the cylindrical surface connected with the wrench clamping surface along the screwing direction forms the positive stress straight line edge;
the curved surface and the connecting position of the cylindrical surface connected with the curved surface along the unscrewing direction form the reverse stress curve edge or the reverse stress curve edge is subjected to rounding treatment to form the rounding curved surface.
3. The one-way tamper evident tube nut of claim 1,
the positive stress straight line edge is parallel to the central axis of the adapter nut;
the reverse stress curve edge or the rounded curved surface gradually extends towards the end face direction of the second end along the unscrewing direction.
4. The one-way tamper evident tube nut of claim 1,
the top end of the curved surface is opposite to the bottom end of the curved surface, and the top end of the curved surface gradually converges towards the direction close to the central axis of the adapter nut along the unscrewing direction.
5. The one-way tamper evident tube nut of claim 1,
and step surfaces for butting the wrench are formed between the bottom end of the wrench clamping surface and the bottom end of the curved surface and the outer side surface of the first end.
6. The one-way tamper evident tube nut of claim 1,
and one or more pairs of wrench clamping surfaces which are oppositely arranged and are parallel to each other are formed on the outer side surface of the second end, and the adapter nut is rotationally symmetrical by taking the central axis of the adapter nut as the center.
7. A one-way anti-disassembly nipple nut having a first end for connection to a pipe connection and a second end for connection to a nipple,
the outer side surface of the first end is a cylindrical surface, the whole outer side surface of the second end is a cylindrical surface, at least one pair of wrench clamping surfaces which are oppositely arranged and are parallel to each other is formed on the outer side surface of the second end, the top end of each wrench clamping surface penetrates through the end surface of the second end, and the width of the top end of each wrench clamping surface is larger than zero;
a forward force-bearing straight line edge used for being in line contact with a wrench during screwing is formed on the wrench clamping surface, a curved surface which is concave relative to an extension surface of the wrench clamping surface and an extension surface of a cylindrical surface is formed between the wrench clamping surface and the cylindrical surface adjacent to the wrench clamping surface along the unscrewing direction, and a reverse force-bearing curved edge or a fillet curved surface used for being in point contact with the wrench during unscrewing is formed on the curved surface;
at least the part of the side edge of the wrench clamping surface, which is opposite to the forward stress linear edge and is close to the second end face, is a linear edge parallel to the forward stress linear edge, and the width of the top end of the wrench clamping surface is less than or equal to the vertical distance between the forward stress linear edge and the projection of the central axis of the adapter nut on the wrench clamping surface.
8. The one-way tamper evident tube nut of claim 7,
the joint of the wrench clamping surface and the cylindrical surface connected with the wrench clamping surface along the screwing direction forms the positive stress straight line edge;
the curved surface and the connecting position of the cylindrical surface connected with the curved surface along the unscrewing direction form the reverse stress curve edge or the reverse stress curve edge is subjected to rounding treatment to form the rounding curved surface.
9. The one-way tamper evident tube nut of claim 7,
the positive stress straight line edge is parallel to the central axis of the adapter nut;
the reverse stress curve edge or the rounded curved surface gradually extends towards the end face direction of the second end along the unscrewing direction.
10. The one-way tamper evident tube nut of claim 7,
the top end of the curved surface is opposite to the bottom end of the curved surface, and the top end of the curved surface gradually converges towards the direction close to the central axis of the adapter nut along the unscrewing direction.
11. The one-way tamper evident tube nut of claim 7,
and step surfaces for butting the wrench are formed between the bottom end of the wrench clamping surface and the bottom end of the curved surface and the outer side surface of the first end.
12. The one-way tamper evident tube nut of claim 7,
and one or more pairs of wrench clamping surfaces which are oppositely arranged and are parallel to each other are formed on the outer side surface of the second end, and the adapter nut is rotationally symmetrical by taking the central axis of the adapter nut as the center.
13. An anti-dismantling pipe joint device, comprising:
a pipe joint; and
a nipple nut, which is a one-way tamper-evident nipple nut as claimed in any one of claims 1 to 12.
14. An air conditioner, comprising:
the outdoor unit is connected with a first connecting pipe for circulation of refrigerant; and
the indoor unit is connected with a second connecting pipe for the circulation of refrigerant, and the first connecting pipe and the second connecting pipe are connected through the anti-dismantling pipe connecting device according to claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474636.XA CN108180208B (en) | 2017-12-29 | 2017-12-29 | One-way anti-dismantling pipe nut, anti-dismantling pipe joint device and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711474636.XA CN108180208B (en) | 2017-12-29 | 2017-12-29 | One-way anti-dismantling pipe nut, anti-dismantling pipe joint device and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108180208A CN108180208A (en) | 2018-06-19 |
| CN108180208B true CN108180208B (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711474636.XA Active CN108180208B (en) | 2017-12-29 | 2017-12-29 | One-way anti-dismantling pipe nut, anti-dismantling pipe joint device and air conditioner |
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| CN (1) | CN108180208B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20230066637A (en) * | 2020-10-22 | 2023-05-16 | 제지앙 둔안 아트피셜 인바이런먼트 컴퍼니 리미티드 | Anti-disassembly connection members and anti-disassembly connection assemblies |
| JP7155320B1 (en) * | 2021-04-01 | 2022-10-18 | イワタボルト株式会社 | security nuts and security bolts |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424731A2 (en) * | 1989-10-24 | 1991-05-02 | Bruno Armin Mock | Method to realize a soldering joint for a rotating coupling between a sleeve and a nut, for connecting pipes in the air conditioning and cold fields |
| CN201339639Y (en) * | 2009-01-16 | 2009-11-04 | 梁伟 | Single-screwing direction nut |
| CN202992435U (en) * | 2012-12-18 | 2013-06-12 | 珠海格力电器股份有限公司 | Metal pipe connecting device |
| CN203375008U (en) * | 2013-06-26 | 2014-01-01 | 广东美的制冷设备有限公司 | Air conditioner and anti-disassembly pipe connecting device |
| CN205560043U (en) * | 2016-02-01 | 2016-09-07 | 浙江盾安禾田金属有限公司 | Nut anti -disassembly's constructional device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6662822B2 (en) * | 2001-11-16 | 2003-12-16 | Apcom, Inc. | One-way nut fastener |
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2017
- 2017-12-29 CN CN201711474636.XA patent/CN108180208B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424731A2 (en) * | 1989-10-24 | 1991-05-02 | Bruno Armin Mock | Method to realize a soldering joint for a rotating coupling between a sleeve and a nut, for connecting pipes in the air conditioning and cold fields |
| CN201339639Y (en) * | 2009-01-16 | 2009-11-04 | 梁伟 | Single-screwing direction nut |
| CN202992435U (en) * | 2012-12-18 | 2013-06-12 | 珠海格力电器股份有限公司 | Metal pipe connecting device |
| CN203375008U (en) * | 2013-06-26 | 2014-01-01 | 广东美的制冷设备有限公司 | Air conditioner and anti-disassembly pipe connecting device |
| CN205560043U (en) * | 2016-02-01 | 2016-09-07 | 浙江盾安禾田金属有限公司 | Nut anti -disassembly's constructional device |
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| CN108180208A (en) | 2018-06-19 |
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