JP2022049368A - Heat-insulating material stripper - Google Patents

Abstract

To provide a heat-insulating material stripper which accurately removes a heat-insulating material of refrigerant piping from a surface thereof by only a constant thickness.SOLUTION: A heat-insulating material stripper 1 comprises a cylindrical blade body 6 with an arrangement that aligns a central axis inside a cylindrical frame body 4. A guide part 2, which becomes a sliding contact guide when inserting a refrigerant pipe 100, is provided on a tip side of the frame body 4. The inside blade body 6 is supported so as to be slidable in a longer direction by a slide support structure that is configured from four bolts 8 erected in a radial direction and a long hole 4a formed in the frame body 4. A tip of the blade body 6 is perfectly accommodated in the frame body 4 in an arrangement near a rear end. In an arrangement near a slid front end, the tip of the blade body 6 slightly projects. A stopper 10 is provided inside a rear end side of the blade body 6, and movement of the cut-down refrigerant pipe 100 in the longer direction is regulated.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat insulating material stripping device for stripping a part of the heat insulating material in the pretreatment when connecting the air conditioner main body and the refrigerant pipe.

As a measure to prevent dew condensation, a part of the outside of the heat insulating material is peeled off at the connection point between the refrigerant pipe and the main body of the air conditioner to a certain thickness, and the connection port is overlapped on the peeled off part, and then the heat insulating treatment is performed. Construction is known. In such construction, when the heat insulating material is peeled off, the worker often uses a cutter knife to perform the peeling work.

However, when the stripping operation is performed using a cutter knife, the stripping state of the heat insulating material tends to vary depending on the operator. If the thickness of the remaining heat insulating material is not constant, dew condensation may occur in places where the thickness of the heat insulating material is insufficient.

Although the tool is not intended for the refrigerant pipe, Patent Document 1 describes a tool for stripping the coating of the coated wire to a certain thickness.

Japanese Unexamined Patent Publication No. 2019-4605

Generally, a member harder than the heat insulating material of the refrigerant pipe is used for covering the covered wire. Therefore, it is easy to insert the blade diagonally and perform cutting. However, it is not easy to cut off a soft member such as a heat insulating material for a refrigerant pipe. Therefore, although it is possible to cut off the surface so as to cut it into pieces, it is difficult to accurately remove only a certain thickness from the surface in order to facilitate the processing in the subsequent process.

Therefore, an object of the present invention is to provide a heat insulating material stripper that accurately removes the heat insulating material of the refrigerant pipe from the surface by a certain thickness.

In order to achieve the above object, the heat insulating material stripping device of the present invention is a heat insulating material stripping device for stripping the heat insulating material covering the copper pipe of the refrigerant pipe of the air conditioner, and the heat insulating material is cut in the circumferential direction. A sliding guide portion that is formed so as to surround the refrigerant pipe and guides the sliding of the refrigerant pipe in the longitudinal direction, and the sliding guide portion are detachably attached to the front end side, and the rear end side is the sliding of the refrigerant pipe. The frame body extending in the direction and the rear end side are supported by the frame body so that the cutting edge faces the tip side, and the blade is smaller than the inner diameter of the sliding guide portion and from the outer diameter of the copper pipe. It is characterized by having a blade body formed in a large tubular shape and an orthogonal guide portion provided at a position intersecting the blade so as to guide cutting in a direction orthogonal to the sliding direction. ..

Further, in the heat insulating material stripper of the present invention, in addition to the above configuration, the blade slides with respect to the frame body so that the blade can freely slide on the tip end side of the sliding guide portion. It is characterized in that it is supported via a support portion.

Further, in the heat insulating material stripper of the present invention, in addition to the above configuration, the cutting edge of the blade in a state where the blade is located most on the rear end side has an edge on the rear end side of the sliding guide portion. It is characterized by matching with.

Further, in the heat insulating material stripper of the present invention, in addition to the above configuration, the space inside the frame on the rear end side of the sliding guide portion is wider on the outer diameter side than inside the sliding guide portion. It is characterized by that.

Further, in addition to the above configuration, the heat insulating material stripper of the present invention is characterized in that the blade is a single-edged blade having a blade formed on the outside.

As described above, according to the present invention, the diameter of the cylindrical blade is smaller than the inner diameter of the sliding guide portion and larger than the outer diameter of the copper pipe of the refrigerant pipe, so that it is constant from the copper pipe. The thickness allows the outside to be peeled off, leaving a part of the heat insulating material. That is, since the orthogonal guide portion for guiding the cutting of the heat insulating material in the direction orthogonal to the sliding direction is provided at the position intersecting the blade portion of the blade, at least the inner region of the blade is surely left. In this state, the heat insulating material can be cut in the radial direction of the refrigerant pipe.

Further, according to the present invention, in addition to the above effects, since the blade body is arranged so that the blade edge can freely appear and disappear toward the tip side of the sliding guide portion, the blade is slid guide after cutting in the longitudinal direction. When the portion is projected toward the tip end side, the blade body can be used as a stopper in the radial direction. That is, if the cutter or the like is cut until it hits the blade protruding toward the tip side, the heat insulating material having the required thickness can be accurately left around the refrigerant pipe without cutting deeper than necessary.

Further, according to the present invention, in addition to the above effects, the position of the blade edge of the blade in the state where the blade is located most on the rear end side coincides with the edge of the sliding guide portion on the rear end side. Therefore, the center of the refrigerant pipe can be reliably maintained with respect to the sliding guide portion until immediately before the start of cutting in the longitudinal direction. That is, since the heat insulating material fed in the sliding direction to the position where the blade is cut is accurately positioned, accurate cutting is possible so as to leave the heat insulating material of uniform thickness from the copper tube.

Further, according to the present invention, in addition to the above effects, the space inside the frame on the rear end side of the sliding guide portion is wider in the radial direction than in the guide portion, so that when cutting the heat insulating material in the longitudinal direction, the heat insulating material is cut. The outer portion of the heat insulating material to be separated is sent to the rear end side without pressing the blade. As a result, it is possible to prevent an increase in friction between the heat insulating material and the blade, so that the blade can be deeply cut in the longitudinal direction.

Further, according to the present invention, in addition to the above effect, since the single blade is formed on the outside of the blade body, the outer portion of the separated heat insulating material is sent to the outside along the inclination of the blade. As a result, the friction generated between the heat insulating material and the blade can be reduced, so that the blade can be easily cut deeply in the longitudinal direction.

The heat insulating material stripper according to the embodiment of the present invention is shown, (a) is an overall perspective view seen from the front side, and (b) is an overall perspective view seen from the back side. It is an exploded perspective view of the heat insulating material stripper. It is a central vertical cross-sectional view of a heat insulating material stripper, (a) is a state where a blade is housed in a frame body, (b) is a figure which shows the state where the blade of a blade protrudes from the tip of a frame body. .. The cutting operation in the longitudinal direction is shown, (a) is a cross-sectional view showing a state of cutting in the longitudinal direction by the heat insulating material stripper of the first arrangement, and (b) is a partially enlarged view of (a). A state in the cutting operation in the radial direction is shown, (a) is a cross-sectional view of the heat insulating material stripper of the second arrangement, and (b) is a partially enlarged view of (a). It is an overall perspective view which shows the modification of the heat insulating material stripper of FIG. It is a central vertical sectional view of the heat insulating material stripper of FIG. FIG. 6 is a cross-sectional view of the rear side of the heat insulating material stripper of FIG. 6 cut at the position of a slit in a direction orthogonal to the sliding direction.

Hereinafter, the heat insulating material stripper according to the embodiment of the present invention will be described with reference to the drawings.

<Structure>
FIG. 1 shows the heat insulating material stripper 1 according to the embodiment of the present invention, (a) is an overall perspective view seen from the front side, and (b) is an overall perspective view seen from the back side. .. Hereinafter, the description will be given with the front side as the front end side of the heat insulating material stripper 1 and the back side as the rear end side.

The heat insulating material stripper 1 has a tubular frame body 4. Inside the frame body 4, a cylindrical blade body 6 is housed in a concentric arrangement. A part of the blade edge 6b of the blade body 6 appears on the tip end side of FIG. 1 (a). In the opening on the tip side of the tubular frame 4, the ring-shaped guide portion 2 serves as a guide for sliding the refrigerant pipe 100 (see FIG. 4) inserted from this opening in the longitudinal direction of the heat insulating material stripper 1. Is fitted. Hereinafter, the member on which the blade 6a (see FIG. 2 described later) is formed will be referred to as a blade body 6, and the tip of the blade 6a will be referred to as a cutting edge 6b.

FIG. 1B shows a part of the blade 6 on the rear end side. As can be seen in FIG. 1 (b), the blade body 6 is supported by four bolts 8 with respect to the frame body 4 on the rear end side. Each of these four bolts 8 is arranged so as to penetrate the elongated hole 4a formed in the longitudinal direction of the frame body 4. Since it is configured in this way, the blade body 6 can slide relatively in the longitudinal direction with respect to the frame body 4 by the distance corresponding to the length of the elongated hole 4a. As described above, in the present embodiment, the slide support portion is configured by the bolt 8 and the elongated hole 4a.

Next, the internal structure will be described in detail with reference to FIG.

FIG. 2 is an exploded perspective view of the heat insulating material stripper 1. The four bolts 8 constituting the slide support portion for fixing the blade body 6 to the frame body 4 are arranged at intervals of 90 degrees in the circumferential direction. These four bolts 8 penetrate the four elongated holes 4a of the frame body 4 and are screwed into the rear end of the blade body 6, and further, a ring-shaped stopper 10 arranged inside the blade body 6 is provided. Is also screwed in. The guide portion 2 on the tip end side of the frame body 4 described above is made of a resin material having a relatively small coefficient of friction, and is detachably fitted and installed with respect to the frame body 4.

Next, the operation of the heat insulating material stripper 1 will be described with reference to FIG.

3A and 3B are central vertical cross-sectional views of the heat insulating material stripper 1, in which the blade 6 is housed in the frame 4 in FIG. 3A, and the blade 6a of the blade 6 is housed in the frame 4 in FIG. It is a figure which shows the state which protruded from the tip of. Hereinafter, for convenience of explanation, the state of FIG. 3A will be referred to as the first arrangement, and the state of FIG. 3B will be referred to as the second arrangement.

As can be seen in FIG. 3A, in the configuration according to the present embodiment, in the first arrangement, the position of the blade edge 6b of the blade body 6 is in the longitudinal direction with respect to the position of the edge on the rear end side of the guide portion 2. It is configured to match with. Since the guide portion 2 is provided so as to be fitted into the opening at the tip of the frame body 4, a step is formed on the inner wall where the guide portion 2 and the frame body 4 overlap.

As described above, a ring-shaped stopper 10 is provided on the rear end side of the blade body 6. The stopper 10 is provided to regulate the movement of the refrigerant pipe 100 (see FIG. 4 below) cut by the blade 6. As a result, it is possible to accurately cut only a certain distance from the end portion. In the second arrangement of FIG. 3B, it can be seen that the blade edge 6b of the blade body 6 protrudes from the tip end side of the guide portion 2. The protruding cutting edge 6b will be described in the section of action.

<Action>
4A and 4B show the work of cutting the refrigerant pipe 100 in the longitudinal direction, FIG. 4A is a cross-sectional view of the state of being cut in the longitudinal direction by the heat insulating material stripper 1 of the first arrangement, and FIG. ) Is a partially enlarged view.

When cutting the heat insulating material stripper 1 in the longitudinal direction from the end of the refrigerant pipe 100 as shown in FIG. 4A, first, the tip of the refrigerant pipe 100 is inserted into the guide portion 2. The inner diameter of the guide portion 2 is substantially the same as the outer diameter of the refrigerant pipe 100 to be worked. As a result, the center of the refrigerant pipe 100 can be aligned with the center of the blade 6 simply by inserting the refrigerant pipe 100 into the guide portion 2. In FIG. 4, the illustration of the alignment work in the previous stage is omitted.

The blade body 6 can freely slide within the range in which the elongated hole 4a constituting the slide support portion is formed. Therefore, the blade body 6 is pushed to the rearmost end side by the refrigerant pipe 100 further pushed from the guide portion 2. At this time, the cutting may be started with the operator holding the bolt 8 and sliding the blade 6 toward the rear end side. Since the four bolts 8 are arranged at an angle of 90 degrees in the circumferential direction, at least two bolts 8 facing each other can be easily grasped by fingers and pressed toward the rear end side to easily center the blade 6. The shaft and the central shaft of the refrigerant pipe 100 can be aligned with each other. When the refrigerant pipe 100 is cut as it is after the alignment, the tip of the refrigerant pipe 100 is configured to abut on the stopper 10 inside the blade body 6.

Next, refer to FIG. 4 (b). The blade body 6 has a single-edged structure in which the blade 6a is formed on the outside. That is, the single-edged blade referred to here means a blade attached by forming an inclination on the outer wall side of the cylindrical blade body 6. Therefore, the inner portion of the heat insulating material 101 cut by the cutting edge 6b can be smoothly cut without generating pressure in the radial direction. On the other hand, the outer portion of the heat insulating material 101 generates a pressure that is pushed away to the outer diameter side by the outer blade (blade 6a). At this time, since the heat insulating material 101 starts cutting on the rear end side of the guide portion 2, the step formed by the portion having a thickness T (range of length L1) overlapping inside the guide portion 2 is formed. The heat insulating material 101 can escape in the outer diameter direction within the range. This makes it possible to prevent the outside of the blade 6 from being pressed by the heat insulating material 101 after cutting.

In this way, by keeping the cross-sectional area of the heat insulating material 101 after cutting constant inside the blade body 6, the center of the refrigerant pipe 100 can be stabilized so as not to deviate from the center of the blade body 6. Further, on the outside of the blade body 6, the pressure from the heat insulating material 101 is released to the outer diameter side to reduce the friction between the two, and it is possible to smoothly cut the blade.

A frictional force F1 as shown in FIG. 4B acts between the guide portion 2 and the surface of the heat insulating material 101. Due to this frictional force F1, the surface of the heat insulating material 101 is pulled toward the tip side when cutting in the longitudinal direction. By the way, since the heat insulating material 101 used for the refrigerant pipe 100 is made of a soft material, the surface of the heat insulating material 101 can be easily deformed even with a slight force. That is, the heat insulating material 101 around the cutting edge 6b is deformed by the surface pulling based on the frictional force F1, and an outward force F2 acts on the heat insulating material 101. That is, the force F2 acts outward in the vicinity of the position where the cutting edge 6b hits the heat insulating material 101, so that the cutting can be advanced while causing an action as if the cutting portion is widened. By such an action, the heat insulating material 101 can be smoothly cut, so that relatively deep cutting is possible in one operation.

5A and 5B show a state in the radial cutting operation, where FIG. 5A is a cross-sectional view of the heat insulating material stripper 1 arranged in the second arrangement, and FIG. 5B is a partially enlarged view of FIG. 5A.

As shown in FIG. 5A, after the tip of the refrigerant pipe 100 is cut in the longitudinal direction until it hits the stopper 10 inside the blade body 6, the blade body is formed by a slide support portion composed of a bolt 8 and an elongated hole 4a. The refrigerant pipe 100 is pushed back to the tip side together with 6. Then, in this state, the heat insulating material 101 is cut along the edge of the guide portion 2 in a direction (diameter direction) orthogonal to the longitudinal direction by a cutter or the like. That is, the distance between the tip end side of the stopper 10 and the tip end side of the guide portion 2 in the second arrangement is set as the cutting length L2 for machining in the longitudinal direction.

At this time, as can be seen in the enlarged view of FIG. 5B, the blade edge 6b of the blade body 6 projects toward the tip end side of the guide portion 2. Therefore, when cutting in the radial direction by sliding the blade of the cutter along the edge on the tip side of the guide portion 2, the blade edge 6b of the blade body 6 serves as a protective wall and can be cut to an unnecessary depth. Can be prevented.

As described above, the inner diameter of the guide portion 2 is set to be substantially the same as the outer diameter of the refrigerant pipe 100. That is, as shown in FIG. 5B, the blade 6 penetrates between the copper pipe 102 of the refrigerant pipe 100 and the guide portion 2 in the second arrangement, so that the heat insulating material is corresponding to the thickness of the blade 6. The pressure in 101 increases. As a result, the refrigerant pipe 100 is fixed in a crimped state by the guide portion 2, so that the cutting work in the radial direction is stable.

<Modification example>
FIG. 6 is an overall perspective view showing the heat insulating material stripping device 21, which is a modified example of the heat insulating material stripping device 1.

A guide portion (sliding guide portion) 22 for guiding the insertion of the refrigerant pipe 100 (see FIG. 4) in the sliding direction is provided on the tip end side of the tubular frame body 24, and the inside of the frame body 24 is slid. The configuration including the tubular blade body 26 extending in the moving direction is the same as that of the heat insulating material stripper 1 of FIG. The same applies to the configuration in which the blade body 26 is supported on the rear end side of the frame body 24.

However, it differs from the heat insulating material stripper 1 in that the blade body 26 is fixed to the frame body 24 and is not configured to be relatively slidable. It is also different in that a slit 24a is formed on the tip end side of the side surface of the frame body 24.

FIG. 7 is a vertical cross-sectional view of the heat insulating material stripper 21 of FIG.

It can be seen that the configuration in which the guide portion 22 is fixed to the tip end side of the frame body 24 by the bolt 27 is the same as that of the heat insulating material stripper 1 of FIG. Further, the blade 26a of the blade body 26 is a single-edged blade attached to the outside. The blade body 26 is arranged so as to match the blade edge 26b of the blade 26a on the rear end side of the guide portion 22. Therefore, as described above as the description of the heat insulating material stripper 1, the outer portion of the heat insulating material 101 of the refrigerant pipe 100 cut by the blade body 26 sent along the guide portion 22 is the guide portion 22 and the frame. It is possible to escape to the outer diameter side by the step formed between the inner wall and the inner wall of the body 24. That is, since the friction between the outer wall of the blade body 26 and the cut heat insulating material 101 is reduced, it is easy to cut the blade body 26 deeply into the heat insulating material 101.

Similar to the heat insulating material stripper 1 in FIG. 1, a stopper 30 is provided on the rear end side of the blade body 26 at a position where it interferes with the heat insulating material 101, so that the heat insulating material 101 is cut to a certain depth. Can be done. The blade body 26 is fixed to the frame body 24 by bolts 28 together with the stopper 30.

The slit 24a (orthogonal guide portion) is formed in a direction intersecting the tip side with respect to the blade body 26 extending in the sliding direction. The slit 24a is formed as a guide for inserting a cutting tool such as a cutter in a direction orthogonal to the sliding direction of the refrigerant pipe 100 (diameter direction of the refrigerant pipe 100). As can be seen from FIG. 7, in the heat insulating material stripper 21, the slit 24a is stopped slightly outside the blade body 26 in the radial direction. Therefore, a cutting tool such as a cutter inserted in the slit 24a does not interfere with the blade body 26. Therefore, neither the blade body 26 nor the cutter is damaged.

FIG. 8 is a cross-sectional view of the rear side cut at the position of the slit 24a in a direction orthogonal to the sliding direction. The deepest position of the slit 24a is represented by a alternate long and short dash line. As described above, the heat insulating material 101 can be cut to a position slightly distant from the blade body 26 on the outer diameter side.

In the work, first, until the tip of the refrigerant pipe 100 hits the stopper 30, the heat insulating material 101 is cut in the sliding direction by the blade 26, and then along the slit 24a from the direction orthogonal to the sliding direction. Cut a cuttable tool such as a cutter.

Next, when the refrigerant pipe 100 is axially rotated relative to the heat insulating material stripper 21, the cutter in the slit 24a cuts the heat insulating material 101 in the circumferential direction.

After the refrigerant pipe 100 cut in this way is pulled out from the heat insulating material stripper 21, the unnecessary portion can be separated and a step can be formed by pulling out the outside of the heat insulating material 101 after the treatment. As described above, in the radial cutting at the position of the slit 24a, the intrusion of the cutter is restricted before reaching the blade body 26, so that there is a slight uncut portion. However, since the heat insulating material 101 of the refrigerant pipe 100 is made of a soft material, it can be easily separated so as to be torn off by simply grasping the outer tubular cut portion and pulling it in the longitudinal direction. Is possible.

In this way, it is possible to pull out the refrigerant pipe 100 together with the outer portion of the heat insulating material 101 cut by the blade 26 and the cutter, etc., and then remove it outside the heat insulating material stripper 21. Since it can be done, nothing remains inside the heat insulating material stripper 21. That is, the work of removing a part of the tubular shape of the heat insulating material 101 left uncut from the inside of the heat insulating material stripper 21 is omitted, so that the work efficiency is improved.

The configuration as described above is an example of the present invention, and further includes the following modifications.

(1) In the above embodiment, the guide portion 2 is shown as an example in which the guide portion 2 is formed in a ring shape. However, as long as it is formed so as to surround the heat insulating material 101 of the refrigerant pipe 100 along the outer periphery thereof, a configuration in which a contact portion is formed by being divided in the circumferential direction may be used.

(2) In the above embodiment, an example is shown in which the blade edge 6b of the blade body 6 is configured to coincide with the edge on the rear end side of the guide portion 2 in the first arrangement. However, as long as the cutting edge 6b does not protrude from the tip in the first arrangement, the configuration may be such that the cutting edge 6b is arranged in a region overlapping the guide portion 2.

(3) In the above embodiment, a configuration in which the frame body 4 is formed in a cylindrical shape is shown as an example. However, it does not have to be cylindrical as long as the guide portion 2 can be fitted to the tip and the blade body 6 can be slidably supported. For example, it may be made of a wire as long as it can hold the guide portion 2 and the blade 6 integrally.

(4) In the above embodiment, an example is shown in which the slide support portion is composed of the elongated hole 4a formed in the frame body 4 and the bolt 8. However, as long as the cutting edge 6b can be supported so as to be able to appear and disappear toward the tip end side of the guide portion 2, a combination of a groove formed in the longitudinal direction and a convex portion sliding in the groove may be used.

(5) In the above embodiment, an example is shown in which the blade body 6 is configured in a cylindrical shape as a whole. However, at least, as long as the cutting edge 6b is formed in a cylindrical shape and the stopper 10 can be provided on the rear end side, the intermediate portion may not be formed in a cylindrical shape. For example, the lightening process may be performed by partially forming a through hole.

The heat insulating material stripper of the present invention has a steel material in the center like a refrigerant pipe because the heat insulating material can be cut evenly to a certain depth by positioning with the outer heat insulating material instead of the central copper pipe. Even if it is a soft material that does not, it is possible to accurately peel off a part of the outer skin.

1 Insulation material stripper 2 Guide part (sliding guide part)
4 Frame body 4a Long hole (slide support part)
6 Blade 6a Blade 6b Blade tip 7 Bolt 8 Bolt (slide support)
10 Stopper 21 Insulation material stripper 22 Guide part (sliding guide part)
24 Frame 24a Slit (Orthogonal guide)
26 Blade body 26a Blade 26b Blade tip 27 Bolt 28 Bolt 30 Stopper 100 Refrigerant piping 101 Heat insulating material 102 Copper pipe F1 Friction force F2 Force T Thickness L1, L2, L3 Length

Claims (5)

It is a heat insulating material stripper that strips off the heat insulating material that covers the copper pipe of the refrigerant pipe of the air conditioner.
A sliding guide portion that is formed so as to surround the heat insulating material in the circumferential direction and guides the sliding of the refrigerant pipe in the longitudinal direction.
A frame body in which the sliding guide portion is detachably attached to the front end side and the rear end side extends in the sliding direction of the refrigerant pipe.
The rear end side is supported by the frame body so that the blade edge faces the tip side, and the blade is formed in a cylindrical shape smaller than the inner diameter of the sliding guide portion and larger than the outer diameter of the copper tube. When,
A heat insulating material stripper provided with an orthogonal guide portion provided at a position intersecting the blade so as to guide cutting in a direction orthogonal to the sliding direction. The first aspect of the present invention is characterized in that the blade body is supported by the frame body via a slide support portion so that the blade can slide freely on the tip end side of the sliding guide portion. The heat insulating material stripper described. The heat insulating material according to claim 2, wherein the cutting edge of the blade in a state where the blade is located at the rearmost end coincides with the edge of the sliding guide portion on the rear end side. Stripper. The aspect according to any one of claims 1 to 3, wherein the space in the frame on the rear end side of the sliding guide portion extends toward the outer diameter side of the inside of the sliding guide portion. Insulation material stripper. The heat insulating material stripper according to any one of claims 1 to 4, wherein the blade is a single-edged blade having a blade formed on the outside.

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