CN117469854A - Capillary tube, nano-head and processing method of capillary tube - Google Patents

Abstract

The invention discloses a capillary tube, a nano-head and a processing method of the capillary tube, and relates to the technical field of mechanical connection. The nano-head is used for being connected with the capillary, and comprises a threaded piece and a connecting piece, wherein a channel for the capillary to pass through is formed in the threaded piece, the inner diameter of one end of the channel is larger than the outer diameter of the capillary and smaller than the maximum outer diameter of a horn mouth of the capillary, one end of the connecting piece extends into the threaded piece and is in threaded connection with the inner wall of the threaded piece, and the other end of the connecting piece is used for being connected with another capillary. The invention can realize the cold connection of the capillary tube and the nano-head, improve the reliability and the stability of the connection, and solve the problem of 'impossible' and convenience of maintenance.

Description

Capillary tube, nano-head and processing method of capillary tube

Technical Field

The invention relates to the technical field of mechanical connection, in particular to a capillary tube, a nano-head and a processing method of the capillary tube.

Background

The capillary tube is a pipeline with the outer diameter of 1-5 mm, and is generally applied to a throttling link in the refrigeration industry. In the prior art, welding technology is mostly used for connecting a heat pump capillary tube and an air conditioner capillary tube, and an application technology capable of solving cold connection of the capillary tube is lacking.

For the capillary tube with the diameter of 3mm applied in the existing heat pump system, if the capillary tube is connected in an original welding mode, the poor welding quality is often caused due to the influence of the site environment and the capability of operators, so that the leakage (slow seepage) liquid phenomenon is caused. Furthermore, the liquid distributing head connected with the capillary tube and the capillary tube are laid under the ground decoration layer or in the wall (shed) body (plate), once diffusion leakage occurs (and easily occurs) at the multi-point welding position of the liquid distributing head and the capillary tube, the liquid distributing head and the capillary tube are difficult to find and maintain. The cold connection can be reasonably avoided and solved.

For cold connection mode, the flanging angle of the conventional horn mouth is 90 degrees (namely line sealing), and the phenomenon of breakage and leakage caused by 'no stress' or 'overlarge stress' at the flanging position when the capillary tube is easily screwed up cannot be realized.

Disclosure of Invention

The invention aims to provide a capillary tube, a nano-head and a processing method of the capillary tube, so as to solve the problems in the prior art, realize cold connection of the capillary tube and the nano-head, improve connection reliability and stability, and solve the problem of 'impossible' and convenience in maintenance.

In order to achieve the above object, the present invention provides the following solutions:

the invention provides a capillary tube, which comprises a horn mouth and a tube body, wherein the horn mouth is formed at one end of the tube body, the opening of the horn mouth is gradually increased from the close to the other end far away from the tube body, and the flanging angle of the horn mouth is an acute angle.

Preferably, the flanging angle of the flare is greater than 50 °.

Preferably, the flanging angle of the flare is 74 degrees.

The invention also provides a nano-head which is used for being connected with the capillary tube in any one of the technical schemes, and comprises a threaded piece and a connecting piece, wherein a channel for the capillary tube to pass through is formed in the threaded piece, the inner diameter of one end of the channel is larger than the outer diameter of the capillary tube and smaller than the maximum outer diameter of the horn mouth of the capillary tube, one end of the connecting piece extends into the threaded piece and is in threaded connection with the inner wall of the threaded piece, and the other end of the connecting piece is used for being connected with the other capillary tube.

Preferably, the inner wall of the screw member is provided with a screw section and a non-screw section, the length of the screw section is more than or equal to 5mm, and the length of the non-screw section is more than 7mm.

Preferably, the outer wall of the screw member comprises a first section and a second section which are fixed into a whole, the cross section of the first section is regular hexagon, the second section is round table-shaped, and is close to and far away from the first section, the diameter of the second section is gradually reduced, the small end of the second section is used for the capillary tube to stretch in, and the non-threaded section on the screw member corresponding to the position of the second section is used for limiting the bell mouth and realizing limiting protection of the capillary tube.

Preferably, the threads of the threaded member are M8 and/or M10 fine threads; the threads of the connecting piece are M8 and/or M10 fine threads.

Preferably, one end of the connecting piece, which is far away from the screw piece, is limited and welded with the horn mouth of the other capillary tube, or the connecting piece is symmetrical in structure, both ends of the connecting piece are provided with external threads, and one end of the connecting piece, which is far away from the screw piece, is limited and screwed with the horn mouth of the capillary tube, which is connected with the other screw piece.

Preferably, the capillary tube is an air conditioner capillary tube or a heat pump capillary tube, the threaded piece is a screw cap or a threaded tube, and the connecting piece is a connecting bolt or a connecting rod.

The invention also provides a processing method of the capillary tube, which is used for processing the capillary tube in any one of the technical schemes, and comprises the following steps:

s1, cutting and scraping an outer protective layer close to one end part of a capillary tube to expose a metal part;

s2, sleeving a thermoplastic tube on the periphery of the capillary tube;

s3, enabling one end of the capillary tube to penetrate through the threaded piece;

s4, cutting one end of the capillary tube, which is positioned in the threaded piece, by using a blade pipe cutter;

s5, clamping the capillary by using a reamer clamp, enabling a micro reaming tip of a micro reaming piece on the positioner to extend into one end of the capillary, hammering the micro reaming piece on the positioner vertically to the lower side close to the capillary and forming a micro reaming at one end of the capillary, and then forming a horn mouth at one end of the capillary by using the reamer;

s6, connecting the prefabricated member with the external threads into the threaded member in a threaded manner;

s7, introducing inert gas into the prefabricated member and a capillary tube screwed on the threaded member through a hole at the end part of the prefabricated member, and then quickly performing thermoplastic sealing and pressure maintaining on the hole at the end part of the prefabricated member; alternatively, the preform and the capillary tube screwed onto the screw are pressed through the valve inside mouth of the end of the preform and pressure is maintained.

Compared with the prior art, the invention has the following technical effects:

the capillary tube comprises the horn mouth and the tube body, the horn mouth is formed at one end of the tube body and gradually increases from the near end to the far end of the tube body, the opening of the horn mouth is gradually increased, the flanging angle of the horn mouth is an acute angle, the problem that the linear seal is damaged and leaked due to the fact that the flanging position is not stressed or is stressed too much during screwing is solved, and the reliability and the stability of connection are improved. The nanometer sub-head is used for being connected with the capillary, the nanometer sub-head comprises a threaded part and a connecting piece, a channel used for the capillary to pass through is formed in the threaded part, the inner diameter of one end of the channel is larger than the outer diameter of the capillary and smaller than the maximum outer diameter of a horn mouth on the capillary, the connection of the capillary and the nanometer sub-head is realized through limiting between the horn mouth and the threaded part, the cold connection mode is little influenced by the construction site environment and the capability of operators, the construction quality and the construction speed are improved, one end of the connecting piece extends into the threaded part and is in threaded connection with the inner wall of the threaded part, the other end of the connecting piece is used for being connected with another capillary, and finally the integral connection of the heat pump system is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a part of the structure of a capillary tube according to the first embodiment;

FIG. 2 is a cross-sectional view of a threaded member in a sub-head provided in accordance with the second embodiment;

FIG. 3 is a cross-sectional view of a connector (in the form of a weld) in a sub-header provided in accordance with the second embodiment;

fig. 4 is a cross-sectional view of a connector (in the form of a snap-fit) in a sub-head provided in the second embodiment;

FIG. 5 is a schematic illustration of the threaded member of FIG. 2 coupled to the coupling member of FIG. 3;

FIG. 6 is a schematic illustration of the threaded member of FIG. 2 coupled to the coupling member of FIG. 4;

in the figure: 1-capillary, 2-flare, 3-screw, 4-connector, 1' -another capillary, 2' -another flare, 4' -symmetrical connector.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The invention aims to provide a capillary tube, a nano-sub head and a processing method of the capillary tube, so as to solve the technical problem of poor connection stability of cold connection of the capillary tube and the nano-sub head in the prior art.

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Example 1

As shown in fig. 1, this embodiment provides a capillary 1, including horn mouth 2 and body, horn mouth 2 shaping is in the one end of body, from being close to the other end that keeps away from the body, and the opening of horn mouth 2 increases gradually, and the turn-ups angle of horn mouth 2 is the acute angle, has solved turn-ups department "atress not" or "atress too big" and has led to linear seal damage and leak the problem when screwing up, improves reliability and the stability of connection.

Specifically, since the capillary 1 in the present embodiment has a diameter of 3mm, a small aperture, and a thin tube wall, the present embodiment sets the burring angle of the burring 2 to be more than 50 °, preferably 74 °, as compared to the conventional burring having a burring angle of 90 °.

Example two

As shown in fig. 2-6, this embodiment provides a nano-head, which is used for being connected with the capillary tube 1 in the first embodiment, and comprises a threaded member 3 and a connecting member 4, wherein a channel for the capillary tube 1 to pass through is formed in the threaded member 3, the inner diameter of one end of the channel is larger than the outer diameter of the capillary tube 1 and smaller than the maximum outer diameter of the bell mouth 2 on the capillary tube 1, and further, the connection between the capillary tube 1 and the nano-head is realized through the limit between the bell mouth 2 and the threaded member 3, the cold connection mode is slightly influenced by the construction site environment and the capability of operators, the construction quality is improved, one end of the connecting member 4 extends into the threaded member 3 and is in threaded connection with the inner wall of the threaded member 3, and the other end of the connecting member 4 is used for being connected with another capillary tube 1', so as to realize the connection of the whole heat pump system.

Specifically, the inner wall of the screw member 3 is provided with a screw section and a non-screw section, the length of the screw section is greater than 5mm, the length of the non-screw section is greater than 7mm, and the applicable pipe diameter is 3mm of the capillary 1, compared with the existing screw member 3 with the pipe diameter of 5mm-7mm, the effective connection length of the capillary 1 in the screw member 3 can be prolonged by the screw member 3 in the embodiment, the possibility that the bell mouth 2 is stressed due to pipeline movement is further reduced, and the reliability and stability of connection are improved.

The threads of the threaded member 3 are high-tolerance M8 and/or M10 fine threads, wherein the M8 fine threads are preferably "M8 x 1, M8 x 0.75 or M8 x 0.5", the M10 fine threads are preferably "M10 x 1.25, M10 x 1, M10 x 0.75 or M10 x 0.5", the threads of the connecting member 4 are high-tolerance M8 and/or M10 fine threads, wherein the M8 fine threads are preferably "M8 x 1, M8 x 0.75 or M8 x 0.5", the M10 fine threads are preferably "M10 x 1.25, M10 x 1, M10 x 0.75 or M10 x 0.5", and the connection stability is increased by screwing with the thread fastener threads.

In the system, at the lower end, a capillary 1 is arranged, at the upper end, a horn 2 is arranged on the capillary 1, in the system, at the upper end, another capillary 1' is arranged, at the upper end, another horn 2' is arranged on the other capillary 1 '.

As shown in fig. 3 and 5, one end of the connecting piece 4 far away from the screw 3 is limited and welded with the other horn mouth 2' of the other capillary tube 1', namely, the other capillary tube 1' positioned at the upper end is welded with the connecting piece 4, and the other end of the capillary tube 1 positioned at the lower end and the connecting piece 4 are clamped with the horn mouth 2 through the screw 3 to realize limited and fixed connection with the capillary tube 1.

As shown in fig. 4 and 6, as another embodiment, the connecting piece 4 is a symmetrical structure, that is, a symmetrical connecting piece 4', and both ends are provided with external threads, and both ends of the symmetrical connecting piece 4' are provided with a threaded piece 3, and are limited and screwed with the other bell mouth 2 'of the other capillary 1', that is, the other capillary 1 'at the upper end and the symmetrical connecting piece 4' are clamped and screwed with the other bell mouth 2 'through the threaded piece 3, and the capillary 1 at the lower end and the symmetrical connecting piece 4' are clamped and screwed with the bell mouth 2 through the threaded piece 3.

The outer wall of screw 3 is including fixed first section and the second section as an organic whole, and the cross section of first section is regular hexagon, and the second section is the round platform form, and is close to keeping away from first section, and the diameter of second section reduces gradually, and the tip of second section is used for capillary 1 to stretch into, and the non-screw section that corresponds with the second section position on the screw 3 is used for spacing and realizes spacing protection to capillary 1 to horn mouth 2.

The capillary 1 is an air conditioner capillary or a heat pump capillary, the screw 3 is a screw cap or a screw tube, and the connecting piece 4 is a connecting bolt or a connecting rod.

Example III

The present embodiment provides a processing method of a capillary tube 1, which is used for processing the capillary tube 1 in the first embodiment, and includes the following steps:

s1, cutting and scraping an outer protective layer close to one end part of the capillary tube 1 to expose a metal part so as to facilitate connection of the capillary tube 1 and the nano-head;

s2, a thermoplastic pipe with proper thickness is sleeved on the periphery of the capillary 1, and the thermoplastic pipe protects the capillary 1;

s3, enabling one end of the capillary tube 1 to penetrate through the screw 3;

s4, cutting one end of the capillary 1, which is positioned in the threaded piece 3, by using a blade pipe cutter so as to enable the section to be flat and free of burrs and ensure the pipe cutting quality, wherein the blade pipe cutter can be electric or non-electric;

s5, clamping the capillary 1 by using a reamer clamp to limit the capillary 1, enabling a conical micro-reaming tip of a micro-reaming piece on a positioner to extend into one end of the capillary, hammering the micro-reaming piece on the positioner vertically close to the lower part of the capillary and forming micro-reaming at one end of the capillary 1 so that the reamer can conveniently expand a horn mouth 2 of the capillary 1, then forming the horn mouth 2 on one end of the capillary 1 by using the reamer, wherein the maximum diameter of the horn mouth 2 is preferably 3.4+/-0.1 mm, and the inner diameter of one end of the threaded piece 3 for clamping the horn mouth 2 is preferably 3.1mm, wherein the micro-reaming piece on the positioner is a tool piece or a tip-shaped cone with the conical micro-reaming tip, and the reamer can be electric or non-electric;

s6, connecting a prefabricated member with external threads into the threaded member 3 in a threaded manner, wherein the prefabricated member can be made of plastic, metal or nonmetal materials;

s7, maintaining pressure on the capillary tube 1 to ensure the installation quality of the heat pump unit, wherein the used prefabricated members are divided into two types:

the shape of the prefabricated part is consistent with the shape of the half connecting piece 4 in the length direction, inert gas with certain pressure is introduced into the prefabricated part and the capillary tube 1 screwed on the screw thread piece 3 through the hole at the end part of the prefabricated part, and then thermoplastic sealing is carried out on the hole at the end part of the prefabricated part rapidly, so that the protection effect on the inner wall of the capillary tube 1 is achieved, and each capillary tube 1 is ensured to meet the standard before being installed;

the other prefabricated part is a prefabricated part with a valve core mouth at one end, is formed by turning, is pressed into the sealed capillary tube 1 through the valve core mouth, maintains pressure, and is pressed according to the highest pressure or higher than the highest pressure required by the system in operation. Such as: when the outlet temperature of the compressor is about 70 ℃ during R410a heating, the working pressure reaches 4.5Mpa, and the pressurizing pressure is 5-6 Mpa, so that the capillary tube 1 with the pressure maintaining of 2-4 Mpa has reliable quality, the problems of no leakage and the like in the ground of cement can be ensured, and the device can be used for the same service life as a building.

The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In summary, the present description should not be construed as limiting the invention.

Claims (10)

1. A capillary tube, characterized by: the novel pipe comprises a horn mouth and a pipe body, wherein the horn mouth is formed at one end of the pipe body, the horn mouth is close to and far away from the other end of the pipe body, the opening of the horn mouth is gradually increased, and the flanging angle of the horn mouth is an acute angle.

2. The capillary tube of claim 1, wherein: the flanging angle of the horn mouth is larger than 50 degrees.

3. The capillary tube of claim 1, wherein: the flanging angle of the horn mouth is 74 degrees.

4. A nano-head, characterized in that: a capillary tube according to any one of claims 1 to 3, comprising a screw member and a connecting member, wherein a passage for the capillary tube to pass through is formed in the screw member, the inner diameter of one end of the passage is larger than the outer diameter of the capillary tube and smaller than the maximum outer diameter of the bell mouth of the capillary tube, one end of the connecting member extends into the screw member and is in threaded connection with the inner wall of the screw member, and the other end of the connecting member is used for connecting the other capillary tube.

5. The nanohead of claim 4, wherein: the inner wall of the threaded piece is provided with a threaded section and a non-threaded section, the length of the threaded section is more than or equal to 5mm, and the length of the non-threaded section is more than 7mm.

6. The nanohead of claim 5, wherein: the outer wall of screw thread spare is including fixed first section and the second section as an organic whole, the cross section of first section is regular hexagon, the second section is round platform form, and is close to keeping away from first section, the diameter of second section reduces gradually, the tip of second section is used for the capillary stretches into, on the screw thread spare with the non-screw thread section that the second section position corresponds is used for right the horn mouth is spacing and realizes right the spacing protection of capillary.

7. The nanohead of claim 4, wherein: the thread of the threaded piece is M8 and/or M10 fine thread; the threads of the connecting piece are M8 and/or M10 fine threads.

8. The nanohead of claim 4, wherein: the connecting piece is characterized in that one end, far away from the threaded piece, of the connecting piece is limited and welded and fixed with the horn mouth of the other capillary tube, or the connecting piece is symmetrical in structure, external threads are arranged at two ends of the connecting piece, and one end, far away from the threaded piece, of the connecting piece is limited and screwed and fixed with the horn mouth of the capillary tube, which is connected with the other threaded piece.

9. The nanohead of claim 4, wherein: the capillary tube is an air conditioner capillary tube or a heat pump capillary tube, the threaded piece is a screw cap or a threaded tube, and the connecting piece is a connecting bolt or a connecting rod.

10. A method of processing a capillary tube, characterized by: a method for processing the capillary tube of any one of claims 1-3, comprising the steps of:

s1, cutting and scraping an outer protective layer close to one end part of a capillary tube to expose a metal part;

s2, sleeving a thermoplastic tube on the periphery of the capillary tube;

s3, enabling one end of the capillary tube to penetrate through the threaded piece;

s4, cutting one end of the capillary tube, which is positioned in the threaded piece, by using a blade pipe cutter;

s5, clamping the capillary by using a reamer clamp, enabling a conical micro-reaming tip of a micro-reaming piece on the positioner to extend into one end of the capillary, hammering the micro-reaming piece on the positioner vertically to the lower side close to the capillary and forming a micro-reaming at one end of the capillary, and then forming a horn mouth at one end of the capillary by using the reamer;

s6, connecting the prefabricated member with the external threads into the threaded member in a threaded manner;

s7, introducing inert gas into the prefabricated member and a capillary tube screwed on the threaded member through a hole at the end part of the prefabricated member, and then quickly performing thermoplastic sealing and pressure maintaining on the hole at the end part of the prefabricated member; alternatively, the preform and the capillary tube screwed onto the screw are pressed through the valve inside mouth of the end of the preform and pressure is maintained.