JP3100858B2 - Spiral measuring device and measuring method, helical blade manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical body measuring apparatus suitable for measuring the shape of a helical body made of, for example, an elastic member.

[0002]

2. Description of the Related Art Conventionally, reciprocating compressors have been used as compressors.
Various types such as a rotary type are known. But,
In these compressors, the structure of a drive unit such as a crankshaft for transmitting the rotational force to the compressor unit and the structure of the compression unit are complicated, and the number of parts is large. Further, in such a conventional compressor, it is necessary to provide a check valve on the discharge side in order to increase the compression efficiency. However, since the pressure difference between both sides of the check valve is very large, the check valve Gas leaks easily and compression efficiency is low. In order to solve such a problem, it is necessary to increase the dimensional accuracy and the assembly accuracy of each part, which increases the manufacturing cost.

[0003] In view of such drawbacks of the conventional compressor, a fluid compressor as described in, for example, Japanese Patent Application Laid-Open No. 2-19683 has been developed. That is, as shown in FIG. 5, the fluid compressor includes a closed case A, a cylinder B provided in the closed case A, having a suction end side and a discharge end side, and a cylinder B in the cylinder B. A cylindrical rotating body C that is arranged eccentrically along the axial direction and is rotatable relative to the cylinder B while a part thereof is in contact with the inner peripheral surface of the cylinder B, and is provided on the outer periphery of the rotating body C. A helical blade groove D formed by a pitch gradually decreasing toward the suction end side and the discharge end side of the cylinder B.
(See FIG. 6) and an outer peripheral surface which is made of an elastic member such as a fluorine resin material and which is removably fitted into the blade groove D and slidably contacts the inner peripheral surface of the cylinder B. Spiral helical blade F (see FIG. 7) for partitioning the space B into a plurality of working chambers E, a cylinder B and a rotating body C
And a drive means G for sequentially rotating the fluid from the suction end side of the cylinder B and flowing into the working chamber E to the working chamber E on the discharge end side of the cylinder B.

By the way, it is necessary to measure whether or not the helical blade F is molded as designed after resin molding. Therefore, conventionally, an instruction micro
Data or a general-purpose two-dimensional or three-dimensional measuring device, the method of setting the minimum value between two opposing points of any cross section of the helical blade F to the width or height dimension is applied to the shape measurement of the helical blade F Have been. In addition, two-dimensional or three-dimensional measurement
The methods using fixed equipment include a contact method and a non-contact method.

However, since the helical blade F is made of a flexible elastic member, it is very difficult to measure the dimensions. In particular, if the helical blade F is left unclamped or clamped by a means that does not comply with the definition, the helical blade F is made of an elastic member, and therefore has a helical shape different from the design value. , It is impossible to determine the true dimensions (dimensions such as width and height in actual use).

[0006] In particular, by a method using an indicator micrometer.
Is dependent on the operator's can.
Therefore, the measurement requires skill. Furthermore, since the measuring force is large (generally 7 to 10 N), the measuring object may be deformed, particularly when the measuring object is an elastic body. Also, if the pitch of the spiral is small, the measuring instrument head (anvil side) cannot be inserted into the position to be measured. On the other hand, in the method of a two-dimensional or three-dimensional measuring instrument, as described above, it is sufficiently conceivable that the obtained value is not a dimension accurately representing a width or height.

[0007]

As described above, according to the prior art, since the helical blade is made of a flexible elastic member, it is very difficult to measure the dimensions. In particular, if the helical blade is left unclamped or clamped by means that do not follow the definition,
Since the helical blade is made of an elastic member,
The spiral shape is different from the design value, and it is impossible to determine the true dimensions (dimensions such as width and height in the state of actual use) no matter which part is measured. The present invention has been made in view of the above circumstances, and has as its object to provide a helical body measuring device capable of measuring the dimensions of a helical blade with high accuracy.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a wound body having a spiral groove into which a spiral body is fitted and a measuring groove arranged in a direction intersecting the spiral groove, and the spiral body is wound around the spiral body. A spiral body measuring device comprising: a pressing body that presses against a body; and a measuring unit that measures the spiral body with the measurement groove. At this time, it is preferable that the pressing body includes an elastic member pressed by the spiral wound on the winding body. It is attached to one end of the winding body and extends toward the other end.
A pressing member to be set, is mounted to the other end of the wound body, it is preferable to anda fastener for holding the pressing body in the pressing direction. Further, it is preferable to include a holding body that holds the winding body rotatably. Further, according to the present invention, a step of winding a spiral body into one of the grooves provided intersecting, a step of closely contacting the spiral body with the groove, and measuring the spiral body by loosely inserting a measuring element into the other of the grooves. Process and
Is a method for measuring a helical body. Ma
The present invention is a manufacturing process for manufacturing a helical blade,
Measuring a shape of the helical blade.
The helical blade manufacturing method,
Is the helical groove in one of the intersecting grooves.
Winding a blade, and attaching the helical blade to the
The step of closely contacting the groove, and loosely inserting the probe into the other of the grooves;
Measuring the helical blade by using
A method for manufacturing a helical blade, characterized in that:

[0009]

According to the present invention, it is possible to measure the shape, such as the width and height of a helical blade, at an arbitrary position with high accuracy and high efficiency under the same design conditions as the actual use condition. Become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show a helical body measuring apparatus according to this embodiment. This helical body measuring device has a cylindrical wound body 2 on which a helical blade 1 is detachably wound, and is fitted to one end of the wound body 2 and wound around the wound body 2. A pressing body 3 that presses the helical blade 1 openably and closably in the radial direction to bring the helical blade 1 into close contact with the winding body 2, and a tip of the pressing body 3 fitted to the other end of the pressing body 3 and A fastening body 4 which is fixed to the opening to fix the opening and closing of the pressing body 3, a holding body 5 for holding the both ends of the winding body 2 by pressure, and a winding body provided independently of the holding body 5 2
And a displacement detector 6 for measuring the shape, such as the width and height, of the helical blade 1 wound thereon.

Thus, the wound body 2 has a cylindrical main body 2.
a, a cylindrical first held portion 2b coaxially extended to one end of the main body 2a and fitted with the pressing body 3, and coaxially extended and fastened to the other end of the main body 2a. It comprises a columnar second held portion 2c into which the body 4 is fitted. Main unit 2
a has an outer diameter slightly smaller than that of the rotating body C (see FIG. 6) on which the helical blade 1 is actually fitted and mounted. A blade groove 2a1 into which the helical blade 1 is removably fitted is formed in the main body 2a. The blade groove 2a1 is a blade groove D into which the helical blade 1 is actually fitted (see FIG. 6).
It is formed in the same size as. Furthermore, for example, two measurement grooves 2 a
2, 2a2 (see FIG. 3) are formed. The depths of the measurement grooves 2a2 and 2a2 are set to the same depth as the blade grooves 2a1. In addition, the first held portion 2b includes:
The step 2b1 is formed, and the pressing body 3 is locked and positioned at the step 2b1. The large diameter portion 2c1 is formed in the second held portion 2c.
Further, conical holding holes 2b2 and 2c2 are formed coaxially with the main body 2a on the end surfaces of the first held portion 2b and the second held portion 2c.

Further, the pressing body 3 has a rectangular substrate 3a fitted to the first held portion 2b and locked / positioned on the step 2b1, and a rolled body 2 at both ends of the substrate 3a. And a pair of pressing arms 3b, 3b pivotally supported to open and close. And inside the pressing arm 3b,
A pressing surface 3b1 that contacts the outer peripheral surface of the helical blade 1 wound around the winding body 2 is formed, and a tapered surface 3b2 that the fastening body 4 contacts is formed outside the distal end. The pressing surface 3b1 is formed by an elastic member 3b3 embedded in the pressing arm 3b. The elastic member 3b3 is for preventing the helical blade 1 from being damaged, and is made of, for example, rubber.

On the other hand, the fastening body 4 comprises a reference ring 4a fitted to the large diameter portion 2c1, and a fastening ring 4b screwed to the reference ring 4a. The reference ring 4a has a reference outer diameter portion 4a1 with which the tips of the pressing surfaces 3b1 and 3b1 abut, and a fastening ring 4b is coaxially extended with the reference outer diameter portion 4a1 and is screwed to the outer peripheral portion. It has an external thread portion 4a2 smaller in diameter than the outer diameter portion 4a1.
The outer diameter of the reference outer diameter portion 4a1 is equal to the blade groove 2a.
1 is provided so as to be equal to the designed outer diameter of the helical blade 1 wound around the winding body 2 by being fitted into the helical blade 1. Further, since the fastening ring 4b is screwed to the male screw portion 4a2 and provided so as to be able to advance and retreat in the axial direction of the wound body 2, the screw portion 4b1 and the tapered surfaces 3b2 and 3b2 are coaxially extended with the female screw portion 4b1. , And presses the pressing arms 3b, 3b against the reference outer diameter portion 4a1.
It consists of

Further, the holding body 5 has holding holes 2b2 and 2c.
A pair of center jigs 5 having a conical tip that fits into the center jig 2
a, 5a; holding heads 5b, 5b for rotatably holding these center jigs 5a, 5a;
and a base 5c for holding the wound body 2 holding the b and 5b so as to be able to advance and retreat in the axial direction. The center jigs 5a, 5a facing each other are provided so as to share an axis, and the axis of the winding body 2 to be held is made to coincide with the shared axis.

Further, the displacement detector 6 has a pair of pin-shaped measuring elements 6a, 6a, and an arithmetic section (measuring section) for measuring the width and height of the helical blade 1 based on the displacement signals from the measuring elements 6a, 6a. (Not shown)).

Next, the operation of the helical body measuring apparatus having the above configuration will be described. First, the helical blade 1 is fitted into the blade groove 2a1 of the wound body 2 to wind the helical blade 1 around the wound body 2. Then, the main body 2a
The helical blade 1 is formed to have a slightly smaller diameter than the rotating body C (see FIG. 6) on which the helical blade 1 is actually fitted and mounted. Next, the pressing body 3 is attached to the first held portion 2b of the wound body 2.
Are fitted and locked and positioned at the step 2b1. Then, the pressing arms 3b, 3b are rotated to press the pressing surface 3b.
1, 3b1 is brought into contact with the outer peripheral surface of the helical blade 1. At this time, the pressing arms 3b, 3b and the measuring groove 2a
2, 2a2 should not overlap. Next, after fitting the reference ring 4a to the large diameter portion 2c1, the external thread portion 4a2
By fitting the female screw portion 4b1, the fastening ring 4
b is mounted on the distal ends of the pressing arms 3b, 3b. That is, when the fastening ring 4b is screwed and advanced toward the winding body 2, the inner peripheral edge of the fastening ring 4b becomes tapered 3b.
2, 3b2, and gradually press the arms 3b, 3b
Is pressed in the closing direction. Accordingly, the pressing arm 3
The outer peripheral surface of the helical blade 1 is pressed to the designed outer diameter position of the helical blade 1 by the pressing surfaces 3b1 and 3b1 of b and 3b. As a result, the inner peripheral surface of the helical blade 1 comes into close contact with the bottom surface of the blade groove 2a1. Thus, the winding body 2 on which the helical blade 1 pressed by the pressing arms 3b, 3b is wound is moved to the center jig 5a,
It is held by holding heads 5b, 5b via 5a. Thereby, the winding body 2 is set coaxially with the center jigs 5a, 5a. Then, the center jigs 5a, 5a are rotated so that one measurement groove 2a2 is located directly above. Then, as shown in FIG. 2, the tracing styluses 6a, 6a are loosely inserted into the measurement grooves 2a2, and the helical blade 1 is held.
The width W is measured. At this time, as shown in FIG. 4 , the tracing styluses 6a are raised from the bottom surface position L1 of the measurement groove 2a2 to the outer peripheral surface position L2 of the helical blade 1,
The change of the width W in the depth direction is measured. In addition, as shown in FIG. 4 , the height ΔH of the helical blade 1 is measured by calculating the difference between the bottom surface position L1 of the measurement groove 2a2 and the outer peripheral surface position L2 of the helical blade 1. The same measurement is repeated at different locations, and the shape accuracy of the helical blade 1 is measured.

As described above, the helical body measuring apparatus of this embodiment has the following special effects. That is,
[1] The wound body 2 is provided with a blade groove 2a1 having the same shape as the blade groove provided on the actual rotating body of the compressor, and the helical blade 1 is wound by fitting the helical blade 1 into the blade groove 2a1. The helical blade 1 is wound around the body 2 and the pressing arm 3
b, since as fixed by 3b, even helical blade 1 made of a flexible elastic body, stable at the applied design values etc. Contact Rino shape on actual compressor fixed can do. [2] Since the measurement groove 2a2, 2a2 is provided in the wound body 2 in the axial direction, the same effect as that applied to an actual compressor is obtained in combination with the effect [1]. The width and height of the helical blade 1 under the condition can be measured at an arbitrary position with high accuracy and high efficiency.

The number of measurement grooves may be three or more. Further, the measurement groove may not be provided in the axial direction of the wound body, but may be provided slightly inclined with respect to the axial direction. Further, the number of pressing arms may be three or more. Furthermore, in the above embodiment, the displacement detector 6 measures the width and the height. However, by adopting a three-dimensional measuring device as the displacement detector 6, more advanced shape measurement can be performed. It may be performed.

The spiral body measuring apparatus of the present invention has the following special effects. That is, [1] a blade groove having the same shape as the blade groove provided in the actual rotating body of the compressor is provided in the wound body, and the helical blade is fitted into the blade groove to wind the helical blade around the wound body. so as to instrumentation and, since so as to fix the helical blade by the pressing arm, even helical blade made of a flexible elastic body, Ri design values etc. Contact applied in the actual compressor Can be fixed stably under the condition of [2] Since the wound body is provided with a measurement groove in the axial direction thereof, in combination with the above effect [1], the wound body is provided under the same condition as that applied in an actual compressor. The shape measurement such as the width and height of the helical blade can be measured at an arbitrary position with high accuracy and high efficiency.

【The invention's effect】 According to the present invention, applied in actual compressor
The shape of the helix under the same conditions as
It can be measured with high efficiency and high efficiency. Also this method
By measuring the shape using
It is possible to provide a rical blade.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view of a main part of a spiral measurement device according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory diagram showing a measuring method by the spiral body measuring device according to one embodiment of the present invention.

FIG. 5 is an explanatory diagram of a conventional technique.

FIG. 6 is an enlarged view of a rotating body in FIG. 5;

FIG. 7 is an enlarged view of the helical blade in FIG.

[Explanation of symbols]

1: helical blade, 2: wound body, 3: pressed body, 4:
Fastener, 5: Holder.

Continuation of front page (56) References JP-A-2-19683 (JP, A) JP-A-6-300504 (JP, A) JP-A-5-118828 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F04C 18/30-18/352 G01B 21/02 G01B 21/20

Claims (6)

(57) [Claims] A wound body having a spiral groove in which a spiral body is fitted and a measurement groove arranged in a direction crossing the spiral groove; a pressing body for pressing the spiral body against the wound body; And a measuring means for measuring the spiral in the measurement groove. 2. The spiral pair measuring device according to claim 1, wherein the pressing body includes an elastic member pressed against the spiral wound on the winding body. 3. A pressing body attached to one end of the winding body and extending toward the other end, and a fastening member attached to the other end of the winding body for holding the pressing body in a pressing direction. The spiral body measuring device according to claim 1, comprising: a body. 4. The helical body measuring apparatus according to claim 1, further comprising a holder for rotatably holding the wound body. 5. A step of winding a spiral body into one of the grooves provided intersecting, a step of bringing the spiral body into close contact with the groove, and measuring the spiral body by loosely inserting a measuring element into the other of the grooves. A method for measuring a helical body, comprising the steps of: 6. A manufacturing process for manufacturing a helical blade, Measuring a shape of the helical blade.
Helical blade manufacturing method The measuring step includes: Insert the helical break into one of the grooves
Winding the wire, Insert the helical blade into the groove
A step of bringing into contact, Insert the probe into the other end of the groove and insert the helical blade
Measuring the Helical blade manufacturing method characterized by comprising:
Law.