JPS5863421A - Synthetic resin heat exchanging tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain the titled light, flexible and strong heat exchanging tube that need not onsert turbulent piece by a method wherein spiral blades as turbulent piece are provided in a unitary body with the inner wall of the cylinder. CONSTITUTION:As an inner mouth metal 24 is rotated, resin in the from of a plate is extruded downward from an extruding slit 30. From the extruding hole 36 of an outer mouth metal 26 resin is extruded downward in the cylindrical form as if resin extruded in the plate form is encircled. Above a cooling water tank 38 a cylindrical resin inner wall and a plate resin edge are butted, fixed and cooled in the cooling water tank 38 to be taken out. The plate resin is twisted spirally between the fixing position to the cylindrical resin inner wall and the inner mouth metal 24 and formed into the desired spiral blade. The turbulents do not oscillate in the flow direction and do not revolve around the axial line. Turbulent efficiency is improved and abnormal noises can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange tube made of synthetic resin and a method for manufacturing the same, and more specifically, the present invention relates to a heat exchange tube made of synthetic resin and a method for manufacturing the same. The present invention relates to a synthetic resin heat exchange tube that not only saves the effort of insertion, but also is lightweight, has visibility, and has excellent strength, and a method for manufacturing the same.

Turbulence elements are inserted into fluid passage pipes of car radiators, various air conditioners, etc. to create turbulent flow in the fluid, increase contact efficiency with pipe walls, and improve heat exchange efficiency.

This insertion/removal flow element is formed in the shape of a ribbon or a spiral blade separately from the flow path tube, and is inserted into the flow path tube one by one as necessary.

In addition, because the outer diameter of the turbulator is made slightly smaller than the inner diameter of the flow path so that it can be easily inserted into the flow path, the turbulator may vibrate in the flow direction within the flow path depending on the fluid flow. Not only does the turbulence efficiency decrease as the turbulent particles rotate around their axes, but also, in air conditioners installed indoors, turbulence occurs when the turbulence particles come into contact with the pipe walls due to the vibrations and rotations mentioned above at night. There are disadvantages such as the abnormal noise that echoes inside the room and creates an unpleasant feeling.

The present invention has been made to solve the above-mentioned problems, and its purpose is to not only save time and effort in inserting turbulators during the manufacturing of heat exchange tubes, but also to be lightweight, flexible, and strong. A heat exchange tube made of synthetic resin is characterized by having four spiral blades integrally provided on the inner wall of the cylindrical tube, and an extruder has an inner die having a slit-shaped extrusion port and an annular extruder. An outer mouthpiece having an extrusion opening is provided, and while rotating at least one of the inner mouthpiece and the outer mouthpiece, resin is extruded into a plate shape from the extrusion opening of the inner mouthpiece, and the outer mouthpiece is pressed onto the resin extruded into the plate shape. Extruding the resin into a cylindrical shape from the outlet and welding it with the resin extruded into the plate shape at a position away from the inner mouth, and during this welding, at least one of the resin extruded into the plate shape and the resin extruded into the cylindrical shape. The resin extruded into a plate shape is welded in a spiral manner between the welding position and the inner mouthpiece by rotating around its axis, and is then cooled, solidified, and taken off. The present invention provides a method for manufacturing a heat exchange tube made of synthetic resin.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The general reference numeral 10 is a heat exchange tube according to the present invention.

The heat exchange tube 10 consists of a cylindrical body 12 and two spiral blades 14 having a spiral tip edge fixed to the inner wall of the cylindrical body 12. The cylindrical body 12 and the spiral blade 14 are integrally formed of synthetic resin.

FIG. 3 shows that three spiral blades 14 are formed on the inner wall of the cylindrical body 12.

FIG. 4 also shows an example of three spiral blades, but in this embodiment, only one of the three spiral blades is attached to the cylindrical body.
The other two spiral blades are fixed to the inner wall of the inner cylindrical body 12 and have a small diameter, and are formed so that a gap is formed between their tip edges and the inner wall of the inner cylindrical body 12.

FIG. 5 shows one helical blade 14, which also has a cylindrical body 12.
It is fixed to the inner wall.

In addition to the above-mentioned 1 to 3 threads, the spiral blade 14 can be formed into a plurality of threads as appropriate centered on the center line of the cylindrical body 12, and is fixed to the inner wall of the cylindrical body 12 with the tip edge of at least one of the spiral blades. All you have to do is stay there.

FIG. 6 is an explanatory diagram showing an example of a manufacturing apparatus for heat exchange tubes 10 according to the present invention.

Reference numeral 20 denotes an extruder, and an inner mouthpiece 24 and an outer mouthpiece 26 are attached to an extrusion opening at the lower end of an extrusion cylinder 22.

The inner mouthpiece 24 is rotatably fixed to the end of a rotating shaft 28 that passes through the extrusion cylinder 22, and has a slit-shaped extrusion opening 30 that communicates with the inside of the extrusion cylinder 22, as shown in FIG. There is. Note that 32 is a gear fitted to the other end of the rotating shaft 28, and 34 is a chain.

The outer mouthpiece 26 is fixed to the lower end of the extrusion tube 22, and is provided with an annular extrusion opening 36.

In FIG. 8, 38 is a cooling water tank installed below the extruder 20, and the extruded resin is reversed by a roller 40 installed in the water tank 38 and guided upward, and then passed through a roller 42. A collection machine 44 is used to collect the items.

Next, a method of manufacturing a heat exchange tube using the above-mentioned apparatus will be explained.

A driving device it (not shown) is driven to rotate the inner mouthpiece 24 and extrude the resin downward in a plate shape from the slit-shaped extrusion opening 30 of the inner mouthpiece 24. Also, the 7 extrusion hole 36 of the outer mouth ring 26
From there, 8N resin is extruded downward in a cylindrical shape so as to surround the resin extruded into the plate shape.

However, the resin extruded by the lever, which is still in a softened state, comes into contact with the inner wall of the cylindrical resin and the edge of the plate-shaped resin above the cooling water tank 38, and in this fixed state enters the cooling water tank 38, where it is cooled and solidified, and is sent to the take-up machine 44. It will be picked up at

The plate-shaped resin that contacts and adheres to the inner wall of the cylindrical resin in a non-rotating state rotates around its axis, so that it spirals between this contact position and the inner mouthpiece 24, and remains in contact and adheres while being kneaded. By cooling and solidifying, the desired spiral blade is formed.

The pitch of this spiral blade is m fat extrusion speed, inner mouth 24
It is determined by the relationship between the rotational speed of the two resins, the distance between the contact position of both resins and the inner mouth ring 24, etc., and an arbitrary pitch can be obtained by changing the above conditions individually or in combination.

In another manufacturing method, in the above device, the inner mouthpiece 24 is fixed in a non-rotating state, the outer mouthpiece 26 is configured to be freely rotatable by an appropriate mechanism, and the resin is extruded into a plate form from the slit-like extrusion port 30 of the inner mouthpiece 24. During extrusion, the resin is extruded from the outer mouthpiece 26 into a cylindrical shape while rotating around its axis, and both resins are fused under the inner mouthpiece 24 in the same manner as described above, and the resin is cooled and solidified by passing through the cooling water tank 38. may be taken out in a rotating state in synchronization with the rotation of the outer mouthpiece 26. In this case as well, the resin extruded into a plate shape from the inner mouthpiece 24 contacts and adheres to the rotating cylindrical resin, rotates together with the cylindrical resin, and forms a spiral between this contact position and the non-rotating inner mouthpiece 24. A desired spiral blade can be obtained by cooling and solidifying in a ringed state. The pitch of the spiral in this case can also be arbitrarily set as in the previous embodiment.

In both of the above embodiments, the extrusion port 30 provided in the inner mouthpiece 24 is provided with slit-like openings having different lengths radially from the center of the inner mouthpiece 24, so that the tip of one spiral blade is formed as shown in FIG. It can be fixed to the inner wall of the cylindrical tube 12 only at the edges.

Furthermore, in the above two embodiments, the inner cap 24 and the outer cap 2
Similar effects can be achieved by extruding the resin by rotating the rollers 6 and 6 at different angular velocities.

In yet another manufacturing method, for example, as shown in FIG. The resin is extruded and rotated around this axis while the extruded resin is passed through a cooling water tank to be cooled and solidified. Alternatively, the resin may be removed.

In the case of this embodiment, the cylindrical tube itself is also ejected.

In the above embodiment, the resin may be extruded without rotating the cap, passed through a cooling water tank to cool and solidify, and then taken out while rotating around its axis.

As described above, according to the heat exchange tube according to the present invention, since the tube body and the spiral vane as the turbulent element are integrally provided, the labor of inserting the turbulent element into the tube body one by one as in the conventional case can be saved. In addition, since the turbulator is fixed to the tube body, the turbulator does not vibrate in the flow direction or rotate around its axis due to the fluid flow, which increases the turbulence efficiency. It has the remarkable effect of preventing the generation of abnormal noise due to contact with the inner wall of the tube due to vibration or rotation.

Further, the method of the present invention has the remarkable effect that the heat exchange tubes can be manufactured continuously and efficiently using a simple device and at a low location.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing a heat exchange tube according to the present invention, and FIG.
The figure is an end view thereof. 3 to 5 are end views showing other embodiments, respectively. Fig. 6 is a cross-sectional explanatory diagram showing the structure of the extruder and the state of extrusion of the resin, Fig. 7 is a bottom view showing the structure of the mouthpiece of the extruder, and Fig. 8
The figure is an explanatory diagram showing the manufacturing process. 10... Heat exchange tube, 12... Cylindrical body, 14
...Spiral blade, 20...Extruder, 22...
...Extrusion tube, 24...Inner cap, 26...Outer cap. 28...rotating shaft, 30...extrusion port, 32...
...Gear, 34...Chain, 36...
・Extrusion port. 38...Cooling water tank, 40...Roller, 42
...Roller, 44...Collection machine. Patent applicant Mihama Seisakusho Co., Ltd. (and 1 other person) Representative Hama Taira Figure 2 10 Figure 3 Figure 4 (closed Figure 6)

Claims (1)

[Scope of Claims] 1. A heat exchange tube made of synthetic resin, characterized in that spiral blades are integrally provided on the inner wall of the cylindrical tube. 2. The extruder has an inner mouthpiece that serves as a slit-shaped extrusion opening,
An outer mouthpiece having an annular extrusion opening is provided, and while rotating at least one of the inner mouthpiece and the outer mouthpiece, resin is extruded into a plate shape from the extrusion opening of the inner mouthpiece, and the outer mouthpiece is placed on the resin extruded into the plate shape. The resin is extruded into a cylindrical shape from the extrusion port of the die and welded to the resin extruded into the plate shape at a position away from the inner die, and during this welding, the resin extruded into the plate shape and the resin extruded into the cylindrical shape are welded together. By rotating at least seven sides around the axis, the resin extruded into a plate shape is welded in a spiral manner between the welding awn position and the inner mouthpiece, and is then cooled, solidified, and taken off. A method for manufacturing heat exchange tubes made of synthetic resin.