JPH01266929A - Tube expander for heat-light exchanger - Google Patents

Abstract

PURPOSE:To fix a thickness of stacked fins by expanding tubes while laying the fins at proper positions with a presser mechanism for the fins of servomotors and a force-up mechanism to force up the fins with so weak a force that curl height parts are not deformed. CONSTITUTION:A push plate 36 to receive the fins on the side of tube bends of a cross line type heat exchanger 101, a pressure mechanism 38 to energize this push plate 36 to the fin side and a fin presser driving device 12 having a position detecting means are provided. The energizing force of the pressure mechanism 38 is set under the deforming strength of the curl height 105 of the fins and before the tubes are expanded by a mandrel 20, the distance between the push plate and a fin holder 26 is fixed to a prescribed dimension and, then, the tubes are expanded. Since positioning suitable to each heat exchanger is carried out by an external controlling means using the servomotors 14a, 14b for the driving device, fin positions to the tubes are controlled before expanding the tubes and the energizing force to the fins is set under a deforming strength of the curl height part, a steady tube expansion can be performed. In this way, the accuracy of positioning dy the servomotors is improved, a plurality of conditions is stored in a memory and the time for changing a preparation can be brought nearly to naught.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tube expansion device for a cross-fin tube heat exchanger that fixes the fins and tubes of the heat exchanger.

Conventional technology Cross-fin tube heat exchangers are generally expanded by increasing the stacked thickness of the fins by the amount of shrinkage of the tube, since the length of the tube shrinks during tube expansion. However, with this method, the fins in the latter half of the tube expansion are compressed as the tube shrinks, so a portion of the fin's collar is deformed.
In particular, there was a drawback that the fins were in close contact near the end of the tube expansion.

As this improvement, JP-A No. 60-68122 discloses 37,
-7 In this case, as shown in FIG. 6, the curved bearing that receives the curved surface of the bend part 104 of the tube 103 of the cross-fin tube heat exchanger 101 has a push-up pin 111, a pin drive device 112, and a push-up □ pin in the part 110. a proximity switch that detects contact between the end fin 106 and the fin holder 114, which presses the end fin 106 on the opening side of the tube 103; 115 is provided, and this fin presser 114
The pin drive device 112 is pushed up to the position stored in the Magneska/l/113 before starting tube expansion, and the fin presser 116 is used to press the There is a method of pressing the fin presser 114 against the end fin 106 with a pressure of 100 to move the fin upward by an amount commensurate with the shrinkage rate of the tube 103, thereby preventing the fins from coming into close contact with each other due to the shrinkage of the tube 103 during tube expansion.

Due to pressing, the outer diameter of the tube 103 varies.

Even if the fin presser 114 is pressed with the same pressing force due to variations in the tube 103 insertion holes of the fins 102, the end fins 106
The position of the fins 102 varies, the stacked thickness of the fins 102 cannot be made constant, and the problem of the fins 102 being in close contact with each other cannot be solved.

In view of this problem, it is an object of the present invention to provide a tube expansion device that always expands the tube under the same conditions even if the tube and fins vary to some extent, and prevents the fins from coming into close contact.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a servo motor, a fin presser drive mechanism that can detect the position of a screw feed mechanism, etc., and a curved surface support with an urging force that is weaker than the force that deforms a part of the curl height 1 of the fin. It is composed of a push-up machine groove that pushes up the fins on the side.

Operation With the above configuration, the relative position of the tube and the fins is always expanded at the same position, and the push-up machine 41' blue gradually expands to each soi 5 without deforming part of the curl height 1 of the fin.
' Since the pipe is expanded with the tube placed in the proper position, the thickness of the fin stack is kept constant and the occurrence of fin adhesion can be prevented.

EXAMPLE An example of the present invention will be described below with reference to the accompanying drawings.

1 is a tube expansion device according to the present invention, which has a base 21 and a main body 3 as its main structure. 4 is a mandrel block, 5 is a rod support plate, and 6 is a fin holding block. It is configured to be slidable by.

A tie rod 11 suspends the rod support plate 5 from the mandrel block 4.

12.13 are a mandrel drive device and a fin presser drive device, respectively, a sensor with a built-in encoder, 6s=
-J 14a, 1. + b, belt conductor 1E8゜15b1 bearings 16a, 16b, ball screw 17a.

1 complete b1 naso) It is composed of 18a and 18b respectively. Jibel 1-61\- by servomorph 140 rotations.

A ball screw 17 rotates via a conductor 15. Natsu 1
8 is mandrel block 4 and fi 7 presser block 5
is fixed. Therefore, the man 1-barrel processor 4 and the fin presser block 5, which are slidably held by the supports 9, 9, are driven up and down by the rotation of the servo motor 14, and can be stopped at any desired position. It goes without saying that the encoder built into the servomoke 14 can be combined with an external control device 19 and used as a position detection means.

The mandrel block 4 has a plurality of stepped holes 21.21 into which the mandrel (V2O) is inserted, and horizontal holes 22. A stopper 24.24, which has a threaded hole formed therethrough and two grooves 23 formed on the outer periphery, is inserted into each horizontal hole 22.22, and the stopper 25 is inserted into the spring 26.
'f; By locking the set screw 2 in the screw hole through the screw 2, the collar 25 closes and opens the stepped hole 21.
It is configured to be sized correctly depending on the position.

Y7, - Mandre/l/20 has a Bohr 1720a at the tip and a boss 20b at the other end, and the boss 20b has a spring pin 20
It is fixed to the mandrel 20 at c.

Reference numeral 26 denotes a fin presser, which is composed of a plate 1.27 and a plurality of presser pieces 28, and is inserted into a rail 29 provided on the lower surface of the fin presser block 6, and is positioned and fixed by a stop pin 30.

Further, the upper part of the mandrel/L'20 insertion hole 31 of the fin holding block 6 is formed to have a smaller diameter than the ball 20a,
A stepped hole is formed to slidably hold the mandre/I/20 and to accommodate the bow/I/20a at the bottom.

The plate 27 of the fin holder 26 has a hole at a position corresponding to the tube position of the heat exchanger to be expanded, and the unnecessary part of the mandrel/L'20 is inserted into the insertion hole 31 with a hole/L'/
20a is in a stored state.

Reference numeral 32 and 33 denote a guide plate 1- that guides the three surfaces rIfi of the fin, and together with a plate (not shown), guides the four surfaces. The guide plates 32 and 33 are adjusted to match the fin width of the heat exchanger using a slide shirt l-34 and a support block 35, and are positioned using fixing screws.

Reference numeral 36 denotes a push plate, and bushings 37 are provided at both ends of the plate with oblong holes corresponding to the tube positions, and the IJ near bush 39 is loosely inserted from the pushing mechanism 38 and inserted into the extending push rod 40 for installation. It is being

Reference numeral 41 denotes an R receiver portion having a groove formed in correspondence with the R portion of the tube, and is attached by inserting a positioning pin 42 into a hole provided in the base 2.

The pressing mechanism 38 is composed of a cylinder 43, pneumatic pressure, and a pressure regulating device, and the urging force of the suppressing mechanism 38 can be arbitrarily set by adjusting the pressure of the pressure regulating device.

Next, the effect of the above configuration will be explained.

The suppressing mechanism 38 is adjusted by a pressure adjustment device so that the urging force is less than the force of the fins and the deformation strength of the height portion, urges the press plate 36 upward, and stops at the protruding end of the cylinder 43. The curved portion of the tube passes through the oval hole of the push plate 36 and is exposed to the separator 9. The heat exchanger is connected to the servo motors 14a and 14b for starting the tube expansion device 1. The rotation is controlled and the fin presser 26
The drive is stopped at a predetermined position. At this time, the push plate 36
The distance between the presser piece 28 of the fin presser 26 and the fin presser 26 is set to a size corresponding to the heat exchanger to be expanded. At the same time, the balls 20a of the mandrel 20 are also positioned in synchronization with the fin presser 26, and by pressing the opening of each tube downward and bringing the curved surface of the tube into contact with the inside of the portion 41, the fin position relative to the tube is set at a predetermined position. It is a positional relationship.

Since the suppressing mechanism 38 urges the press plate 36 so that the strength is less than the curl height portion of the fin, the pitch between each fin is the same as the curl height portion, and is constant between each fin.
As the mandrel v20 descends and the tube expansion progresses, the tube contracts, and the cylinder 43 of the suppression mechanism 38 also contracts, and the tube expansion ends at -1 with a constant pitch between fins.

Effects of the invention As is clear from the above explanation, the present pipe expansion device 1o...
−.

is equipped with a push plate that receives the tube bend side fin of a cross fin type heat exchanger, a suppression mechanism that urges this push plate toward the fin side, and a fin press drive mechanism that has a position detection means, and applies the urging force of the suppression mechanism to the fin. The deformation strength of the curl height portion of the pipe is set to be less than or equal to the deformation strength of the curl height portion, and the pipe is expanded after positioning the pushing plate and the fin presser to a predetermined dimension before expanding the pipe with a mandrel, and using a servo motor as the drive mechanism, Since the position is determined by an external control means that corresponds to each heat exchanger, the position of the fin relative to the tube before expansion is regulated, and the force that urges the fin upward is controlled by the deformation strength of the curl height portion of the fin. As long as it is kept constant below, the fins will not come into close contact with each other during tube expansion, making stable tube expansion possible at all times.

However, by using a servo motor as the drive mechanism, positioning accuracy is improved, and by simply inputting the type of heat exchanger to be expanded by storing multiple conditions in the storage device, the corresponding conditions can be immediately adjusted. Since it can be replaced without fail, the time required for setup changes can be reduced to almost zero compared to the conventional mechanical stopper type 11.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view illustrating the structure of a tube expansion device according to an embodiment of the present invention, Fig. 2 is a sectional view of the mandrel and mandrel block shown in Fig. 1, and Fig. 3 is an exploded perspective view of the mandrel and fin presser block. Figure 4 is a cross-sectional view of the mandrel and fin presser, Figure 5 is a cross-sectional view of the presser plate, Figure 6 is a cross-sectional view of a conventional tube expansion device, and Figure 7 is a cross-finonube type heat exchanger. It is a front view of a container. 4--Mandrel block, 6--Fin presser block, 12-Fin presser drive device, 13-Mandrel drive device, 14a, 14b...Zerbo motor, 17a
, 17b...Ball screw, 18a. 18b--nut, 19...-control device, 20...
Mandrel, 26- Fin presser, 36...Press plate, 38...Suppressing mechanism, 41 Curved surface support part, 10
1--Heat exchanger, 102--Fin, 103--Tube, 104--Bend part, 105--Curl height part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 7
figure

Claims (1)

[Scope of Claims] 1. A cross-fin tube type heat exchanger in which fins and tubes are expanded and fixed, and is slidably provided on the fin side of a curved surface receiving portion that receives a curved surface of a tube bend portion, and is located at a position corresponding to the tube. A press plate with a through hole formed therein, a press mechanism that urges the press plate toward the fin side, a fin presser that presses the fin on the tube opening side, a fin presser block that is movable in the longitudinal direction of the tube axis, and this fin presser. The device includes a block position detection means, a mandrel for expanding a tube, a mandrel block for attaching the mandrel, a drive mechanism for driving the fin presser block, and the mandrel block, and uses the urging force of the pressing mechanism to deform the curl height portion of the fin. and the drive mechanism moves the fin presser block to a position corresponding to each heat exchanger, and drives the mandrel block after positioning the distance between the fin presser surface and the presser plate to a predetermined dimension. A tube expansion device for heat exchangers configured to 2. The tube expansion device for a heat exchanger according to claim 1, wherein the drive mechanism for the stripper block is composed of a servo motor and a screw feed mechanism, and the position detection means is an encoder of the servo motor.