KR950007518B1 - Fluid compressor - Google Patents

Abstract

No content.

Description

Fluid compressor

1 is a longitudinal side view of a fluid compressor showing one embodiment of the present invention;

2 is an enlarged longitudinal sectional view of the main part thereof.

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

4 is a longitudinal sectional side view of a main portion of a fluid compressor showing another embodiment of the present invention.

5 is a longitudinal side view of another fluid compressor main part.

6 is a longitudinal sectional side view of a fluid compressor showing a conventional example of the present invention.

7 is an assembled perspective view of the support mechanism.

8 is an exploded perspective view of the support mechanism.

9 is a longitudinal side view of a fluid compressor showing still another conventional example of the present invention.

* Explanation of symbols for main parts of the drawings

17, 17A, 17B: support mechanism portion 18: support plate

21: sealed case 21a: case body

21b: cover case 23: compression element

27: suction side bearing member (main bearing) 28: discharge side bearing member (sub bearing)

29: rotating body (piston)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid compressor for use in a refrigeration cycle device or the like and for compressing a refrigerant gas as a working fluid.

Background Art Conventionally, various types of compressors, such as a recipe method and a rotary method, are known.

However, in such a compressor, the structure of a drive unit, such as a crankshaft, which transmits rotational force to the compressor unit, and the compression unit is complicated, and the number of parts is many.

In addition, in such a compressor, it is necessary to provide a backflow blocking valve on the discharge side in order to increase the compression efficiency. Since the pressure difference between the two sides of the backflow blocking valve is very large, gas is easily leaked from the backflow blocking valve, so the compression efficiency is low.

In order to solve such a problem, it is necessary to increase the dimensional accuracy and the assembly precision of each component, which increases the manufacturing cost.

Therefore, recently, a fluid compressor has been proposed that removes irrationality, improves sealability by a relatively simple configuration, enables efficient compression, and facilitates the manufacture and assembly of parts.

This is a hermetic compressor as shown in FIG. 9, for example, used in a refrigeration cycle apparatus to compress and discharge refrigerant gas.

The compressor body 1 is composed of a transmission element 3 and a compression element 4 accommodated in the sealed case 2. When the cylinder 5 constituting the compression element 4 is energized by energizing the transmission element 3, this rotation is transmitted to the piston 7, which is a rotating body, through the rotation force transmission mechanism 6.

The piston 7 is rotationally driven with a part of its circumferential surface in contact with the inner circumferential surface of the cylinder 5, and a braid 9 fitted into the groove 8 of the outer circumferential surface of the piston 7. Is also integrally rotated.

The braid 9 rotates with its outer circumferential surface in contact with the inner circumferential surface of the cylinder 5 so that each part of the braid 9 has a piston with the circumferential surface of the piston 7 and the inner circumference of the cylinder 5. It is pushed into the groove 8 as it comes close to the contact with the face, and also moves in the direction of protruding from the groove 8 as it falls away from the contact.

According to the operation of the compression element 4, the refrigerant gas is sucked into the cylinder 5 through the suction tube 10 and the suction hole 11.

In addition, the refrigerant gas is held between the inner circumferential surface of the cylinder 5 and the circumferential surface of the piston 7 by the rotation of the piston 7 while being held in the operating chamber 12 encapsulated by the braid 9. It is sequentially moved to the working chamber 12 on the discharge side and simultaneously compressed.

The compressed refrigerant gas is discharged from the discharge hole 13 into the inner space of the sealed case 2 and returned to the refrigerating cycle through the discharge tube 14.

As described above, in the fluid compressor, both ends of the cylinder 5 and the piston 7 constituting the compression element 4, the main bearing 15, which is the suction side bearing member having the suction hole 11, and the discharge port 13 Rotation is freely supported by the sub-bearing 16, which is a discharge-side bearing member having a).

That is, both support structures for the cylinder 5 and the piston 7 are adopted. Since a part of the circumferential surface of the piston 7 must be brought into contact with the inner circumferential surface of the cylinder 5 along the axial direction, the inner and outer diameters of the main, sub-bearings 15 and 16 are respectively given a predetermined distance (e). Eccentric)

However, both ends of the cylinder 5 and the piston 7 are supported in the state of being supported by both the main and secondary bearings 15 and 16, or inside and outside the main and secondary bearings 15 and 16, respectively. Even if the diameter dimension is manufactured with high precision, even if the attachment and fixing positions of the main bearing parts 15 and 16 with respect to the sealed case 2 are slightly shifted, the parallelism of the cylinder 5 and the piston 7 is maintained with high accuracy. It becomes impossible.

By the way, while the plate | board thickness of the said sealing case 2 is comparatively thin, since the main and sub-bearings 15 and 16 are substantially circular block shape, the amount of heat distortion at the time of welding is difficult, and it is difficult to produce adhesion accuracy, and therefore the cylinder 5 The parallelism between the piston and the piston 7 is not high precision.

In addition, in order to use the attachment fixing screw, the so-called both support structures that can easily insert the screw into at least the sealed case 2 side are ideal, but there is a problem in the attachment accuracy of both bearings 15 and 16.

Therefore, a fluid compressor having a compression element of one structure has been proposed, in which only one end of the cylinder 5 and the piston 7 is attached and fixed to the sealed case and the other end does not rotate.

In other words, the main bearing is fixed to the sealed case, and the secondary bearing is elastically pressed against the piston and the ring made of, for example, a leaf spring from the main belling side, and the support mechanism is inserted and supported.

By the way, such a compression element can satisfy the requirements of one support structure, but when the piston and the cylinder are subjected to a lateral force, a large moment is generated and the scuffing in the contact portion of the piston and the cylinder and the bearing sphere There is irrationality that occurs.

This irrationality is solved in Japanese Patent Application No. 1-337525 filed by the present applicant. That is, as shown in FIG. 6, the sub-bearing 16A is supported by the support mechanism 17 which can move on the plane perpendicular | vertical with respect to the cylinder 5 and the piston 7 axis center.

It supports to the support plate 18 which comprises this support mechanism part 17, and also attaches and fixes the upper and lower ends of the support plate 18 to the sealed case 2 (In addition, the same components as the compressor demonstrated in FIG. 9 are the same. The new description is omitted).

In addition, the support mechanism 17 will be described as shown in FIG. 7 and FIG.

That is, the support mechanism part 17 is comprised from the said support plate 18, the locking mechanism 19, and a pair of fixing screw 20. As shown in FIG.

The support plate 18 is formed in a rectangular plate shape, the plate surface of which is substantially orthogonal to the axial direction of the cylinder 5 and crosses the protruding portion 2a formed in the sealed case 2. Both ends of the direction are welded to the sealed case 2.

The latch 19 is composed of a rectangular body and is formed in a central portion and is formed in a cross section extending in a straight line in one direction in a state substantially along the center line. It has the guide part 19a which is shaped.

In addition, the locking mechanism 19 faces the sub-bearing 16A with the support plate 18 interposed therebetween, and the inside of the guide portion 19a faces the outer end face of the sub-bearing 16A.

In addition, the locking mechanism 19 has a pair of locking grooves 19b on the same straight line substantially perpendicular to the longitudinal direction of the guide portion 19a.

The locking screw 20 is a stepped screw that is screwed into the sub-bearing 16A through the locking groove 19b of the locking hole 19 and is perpendicular to the longitudinal direction of the support plate 18. It freely engages with a slide along the longitudinal direction of the in-engagement groove 19b. This configuration enables movement in the direction orthogonal to the longitudinal direction of the support plate, and further allows the sub-bearing 16A coupled with the locking mechanism 19 to move along the support plate in the longitudinal direction of the support plate by the guide portion 19a. Can be.

That is, in the compressor which supports the sub-bearing 16A to the closed case 2 by such a support mechanism 17, when the sub-bearing 16A receives an irregular and unbalanced pressure, the sub-bearing 16A has a fixed distance. Abnormal movement can be prevented, and the sub-bearing 16A is prevented from displacing largely toward the main bearing 15, for example.

Since the sub-bearing 16A does not press-contact the cylinder 5 and the piston 7, it is possible to prevent the occurrence of wear loss.

Since the subsidiary bearing 16A supports the sub bearing 16A so as to be displaced within the movable range of the catching screw 20 and the supporting plate 18, the sub bearing 16A is approximately equal to the center of the cylinder 5. On the plane orthogonal, that is, in the longitudinal direction of the support plate and in the direction orthogonal thereto.

Therefore, the assembly of the compressor can be simplified by using the degree of freedom of movement of the sub-bearing 16A.

By the way, in this compressor, the support plate 18 which comprises the said support mechanism part 17 is welded and fixed directly on the plane of the protrusion 2a of the airtight case 2, and the positioning criterion of the support mechanism part 17 is also carried out. This is very convenient.

The present invention has been made in view of the above circumstances, and an object thereof is that the discharge side shaft bearing member is freely supported in a plane orthogonal to the shaft center of the cylinder and the piston, and the position of the discharge side bearing member is accurately set so that the attachment accuracy is improved. It is to provide a fluid compressor which can achieve an improvement of the structure and at the same time obtain substantially both of the support structure of the cylinder and the piston.

In order to achieve the above object, the present invention includes a compression element disposed eccentrically with a helical braided rotary body in a cylinder blocked by the suction side bearing member and the discharge side bearing portion at both axial ends. Is installed in a sealed case to gradually transport the working fluid from the suction side to the discharge side of the cylinder, compresses it, and fixes the suction side bearing member to the sealed case, and supports the compression element in the sealed case by inserting the suction side bearing. In the case, the closed case is composed of a case body and a cover case for closing the opening end of the case body, and the stepped portion is provided at either of the opening end of the case body or the opening end of the cover case, And the discharge side bearing member is the axial center of the cylinder and the piston. A support mechanism portion freely movable in a plane orthogonal to the plane; and an end portion of the support plate constituting the support mechanism portion is sandwiched between an open end portion of the case body and a step portion between the open end portion of the cover case and the case. It is a fluid compressor characterized by providing the key groove which engages with the said end of the said support plate in at least one of the opening end part of a main body or the opening end part of a cover case.

In addition, the present invention includes a compression element disposed in an eccentric position of a helical braided rotary body in a cylinder clogged by both an inlet bearing member and an outlet bearing member in an axial direction, and the compression element is installed in a sealed case. Compressing the working fluid by gradually transferring it from the suction side to the discharge side of the cylinder, and fixing the suction side bearing member to the hermetic case, and holding the compression element in the hermetic case by sandwiching the suction side bearing member. The discharge-side bearing member is fixed by using an adhesive after adjusting the axial center positions of the cylinder and the piston.

In addition, the present invention includes a compression element in which both ends of the axial direction are eccentrically positioned in a cylinder blocked by the suction bearing member and the discharge bearing member in an eccentric position, and the compression element is installed in a sealed case. Wherein the working fluid is compressed while being gradually transported from the suction side to the discharge side of the cylinder, the suction side bearing member is fixed to the sealed case, and the compression element is held in the sealed case with the suction side bearing member sandwiched therein, And a support mechanism portion for freely supporting the discharge-side bearing member in a plane orthogonal to the axis centers of the cylinders and pistons, the support mechanism portion having a support plate, and attaching and fixing the support plate to the sealed case. After adjusting the axial position of the piston, adhere to the support mechanism And the supply is a fluid compressor, characterized in that fixed.

Either means can accurately set the positioning of the discharge-side bearing member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the compressor body 1A is composed of a transmission element 22 and a compression element 23 accommodated in the sealed case 21. As shown in FIG.

The transmission element 22 has an annular stator 24 fixed to the inner surface of the sealed case 21 and an annular rotor 25 provided inside the stator 24.

The compression element 23 has a cylinder 26, and the rotor 25 is coaxially fitted to the outer circumferential surface of the cylinder 26.

Both ends of the cylinder 26 are rotatably supported by the main bearing 27, which is the suction bearing member, and the sub bearing 28, which is the discharge bearing member, fixed to the inner surface of the sealed case 21 by welding or the like. Both ends of the cylinder 26 are hermetically closed by the main and secondary bearings 27 and 28.

In the hollow portion of the cylinder 26, a piston 29 as a circumferential rotating body is accommodated along the axial direction.

The central axis A of the piston 29 is disposed eccentrically with respect to the central axis B of the cylinder 26 by a predetermined distance e, and a part of the circumferential surface of the piston 29 is axially aligned. It is in contact with the inner circumferential surface of (26).

On the other hand, one end of the piston 29 has an engaging groove (not shown) along the axial direction in the circumferential surface, the driving pin 33 protruding from the inner circumferential surface of the cylinder (26) Advancing and retreating are inserted freely along the radial direction of the cylinder 26.

Rotation force transmission mechanism 34 is configured by the engaging groove and the driving pin 33. The circumferential surface of the piston 29 is provided with a helical groove 35 formed at a pitch that gradually decreases from both ends of the piston 29 to the right side in the drawing, that is, from the suction side of the cylinder 26 toward the discharge side.

A spiral braid (not shown) is fitted into this groove 35. This braid is made of, for example, a fluororesin material and has a suitable strength, and its thickness is approximately equal to the width dimension of the groove 35.

Each portion of the braid is free to move forward and backward along the radial direction of the piston 29 with respect to the groove 35, and the outer circumferential surface thereof is slid in close contact with the inner circumferential surface of the cylinder 26.

The space between the inner circumferential surface of the cylinder 26 and the circumferential surface of the piston 29 is partitioned into a plurality of operating chambers not shown along the braid.

Each operating chamber is shaped as a crescent that extends from the contact between the piston 29 and the inner circumferential surface of the cylinder 26 to the next contact along the braid, the volume of which gradually decreases as it goes from the suction side to the discharge side of the cylinder 26. It is small.

In addition, a suction tube 36 and a discharge tube 37 of a refrigerating cycle are connected to the sealed case 21, and the suction tube 36 is connected to a suction hole 38 installed in the main bearing 27. And the discharge pipe 37 is connected to pass through the sealed case 21.

The main bearing 27 is directly attached and fixed to the inner wall surface of the sealed case 21, whereas the sub bearing 28 is attached to the sealed case 21 by inserting the support mechanism 17.

Since the structure of the said support mechanism 17 is the same as that of FIG. 7 and FIG. 8 previously, the same figure is applied, and the same description is attached | subjected here and a new description is abbreviate | omitted.

The support plate 18 constituting the support mechanism 17 is fixed to the sealed case 21 as shown in FIGS. 2 and 3.

That is, the closed case 21 is composed of a cylindrical case body 21a having a bottom open only at one end thereof, and a cover case 21b for closing the opening end of the case body 21a.

Here, the thickness of the case main body 21a is made slightly thick, and the thickness of the cover case 21b is made slightly thin.

Then, the stepped portion 39 is provided along the open end of the case body 21a, and the open end of the cover case 21b is fitted to weld to each other.

However, this attachment fixing operation is made by sandwiching both ends of the support plate 18 constituting the support mechanism 17 between the stepped portion 39 of the open end of the case body 21a and the open end of the cover case 21b. Is done after.

In addition, here, a pair of key grooves 40 are provided at the open end of the cover case 21b.

These key grooves 40 are provided at upper and lower ends in the vertical direction, for example, and with width dimensions to which end portions of the support plates 18 can be fitted.

Accordingly, the both ends of the support plate 18 are engaged with the key groove 40, and then the opening end of the cover case 21b is fitted with the step portion 39 provided at the opening end of the case body 21a, and the case body 21a. ) And the cover case 21b are welded to each other.

Referring to the operation of such a fluid compressor, when the rotor 25 is energized by energizing the vibrating element 22, the cylinder 26 rotates in unison.

The rotation of the cylinder 26 is transmitted to the piston 29 via the rotational force transmission mechanism 34.

The piston 29 is rotationally driven with a part of the circumferential surface in contact with the inner circumferential surface of the cylinder 26, and the braid also rotates integrally.

The braid is rotated while its outer circumferential surface is in contact with the inner circumferential surface of the cylinder 26 so that each part of the braid is close to the contact portion with the outer circumferential surface of the piston 29 and the inner circumferential surface of the cylinder 26. It is pushed into the groove 35 and moves in the direction of protruding from the groove 35 as it is dropped from the contact portion.

On the other hand, when the compression element 23 is operated, the refrigerant gas is sucked into the cylinder 26 through the suction hole 38 of the main bearing 27 in the suction pipe 36.

The refrigerant gas sucked in is sequentially transported and compressed to the operation chamber on the discharge side as the piston 29 rotates while being trapped in the operation chamber.

The compressed refrigerant gas is discharged into the inner space of the sealed case 21 from the discharge port (not shown) drilled through the sub-bearing 28, and is returned to the refrigeration cycle through the discharge pipe 37.

On the other hand, the support mechanism 17 is freely supported in the plane orthogonal to the axis center of the cylinder 26 and the piston 29, and the support mechanism 17 is changed to a structure that supports this substantially on both sides. .

The support plate 18 constituting the support mechanism 17 is positioned in the circumferential direction of the support plate 18 at the place where both ends thereof fit over the key groove 40 provided in the cover case 21b. Direction rotation is fixed.

Then, the step portion 39 is provided on the case body 21a, and both ends of the support plate 18 are sandwiched between the opening ends of the cover case 21b, and then the case body 21a and the cover case 21b. The stepped portion 39 is positioned at the position where the fitting is fixed by regulating the height direction of the support plate 18.

In this way, the cylinder 26 and the piston 29 can be changed into a structure that substantially supports both sides, and at the same time, the support plate 18 of the support mechanism 17 may not be directly attached to the cover case 21b. By supporting the case 21b and the sub-bearing 28 independently, such attachment can be facilitated and the assembly process can be reduced.

When the welding between the case body 21a and the cover case 21b is fixed, there is no thermal adverse effect on the support mechanism 17 and the sub-bearing 28 to prevent the change of the shape of the component due to thermal deformation, and furthermore, the compression performance. The fall can be prevented.

In addition, in the above embodiment, the step portion 39 is provided in the case body 21a and the key groove 40 is provided in the cover case 21b. However, the present invention is not limited thereto. .

In addition, the structure as shown in FIG. 4 may be sufficient.

17 A of support mechanism parts which support the said sub-bearing 28 are provided with the latch 42 provided with the slide pin 41 in the support plate 18, and the support pin 43 is attached to the sub-bearing 28. As shown in FIG. The supporting member 44 provided should be installed.

The slide pin 41 and the support pin 43 intersect each other to be orthogonal to each other in the XY direction, and the crossing position coincides with the axial center of the piston 29 (also in the same configuration as the embodiment shown in FIG. 1). Parts are given the same reference numerals and new descriptions are omitted).

Therefore, since the sub-bearing 28 can move on the plane perpendicular | vertical with respect to the axial center of the cylinder 26 and the piston 29 by the support mechanism part 17A, the sub-bearing 28 is parallel with respect to the main bearing 27 After adjusting and assembling so that the position can be caught, the adhesive mechanism 45 is filled and fixed to the support mechanism portion 17A.

The step of attaching and fixing the support plate 18 fits into the key groove 40 installed in the cover case 21b constituting the sealed case 21, and is provided along the opening end of the case body 21a. It fits between the part 39 and the cover case 21b, and fixes it.

According to this configuration, substantially both ends of the cylinder 26 and the piston 29 are supported, so that a large moment is not generated even if the axial force acts on the piston 29. It is the same, and also there is no thermal adverse effect at the time of attachment fixing of the support plate 18.

Moreover, as shown in FIG. 5, the adhesive supply pipe 46 is connected to the cover case 21b of the sealed case 21, and the adhesive 45 is supplied to the support mechanism 17B here.

The support mechanism 17B is approximately holding the secondary bearing 28. It is a container having a shape, and in this case, it is assembled and adjusted so as to be in a position where parallelism is obtained with respect to the main bearing (not shown), and then the adhesive 45 is supplied through the adhesive supply pipe 46, and the support mechanism 17b is directly a cover case. It is fixed to 21b.

Therefore, in this configuration, the keyway is not required in the cover case 21b, and the same operation and effect as in the above-described embodiment can be achieved.

In addition, the fluid compressor of the present invention is not limited to a refrigeration cycle apparatus, but may be applied to other compressors.

As described above, according to the present invention, thermally detrimental effects can be eliminated in attaching and fixing the discharge-side bearing member to the sealed case, thereby preventing thermal deformation of the component and improving assembly workability, thereby contributing to a reduction in unit cost.

Subsequently, substantially both of the support structures of the cylinder and the piston can be obtained, and the effect of improving the compression performance can be obtained.

Claims (3)

Compression element 23 having an eccentric position of a rotating body 29 wound with a spiral braid in a cylinder 26, which is closed at both ends of the axial direction with a main bearing member 27 and a sub bearing member 28, and this compression element. It consists of a cylindrical sealed case 21 for accommodating 23 and supporting it via the main bearing member 27, and the working fluid is brought into the suction side of the cylinder 26 by the operation of the braid and the rotating body 29. A fluid compressor for compressing while gradually transporting from the discharge side to a discharge side, comprising: a sealed case 21 having a case body 21a and a cover case 21b each having an open end; A stepped portion 39 provided at any one of the open end of the case body 21a or the cover case 21b; The case body 21a and the cover case 21b are fitted together and fixed to each other through the stepped portion 39, and the support plate 18 is sandwiched between the stepped portions 39 in the sealed case 21. And; Engaging with the support plate 18 to support the sub-bearing member 28 and to freely move through the guide portion 19a in a plane orthogonal to the shaft center of the bearing 26 and the rotating body 29. Spheres (19, 42, 44); A key groove 40 provided at one of the opening ends and engaged with an end of the support plate 18; Support mechanism part 17 which consists of fixing members 20 and 45 which fix the said latch 19 and the sub-bearing member 28 to the said support plate 18 after adjustment of the axial center of the said cylinder 26 and the rotating body 29. And 17A). The holding hole 44 has a recess, and after adjusting the axial position of the cylinder and the rotor 29, the recess 45 is filled with the adhesive 45 through the supply pipe 40 to support the plate. Fixed to 18). Compression element arranged in an eccentric position with a rotating blade 29 wound in a spiral braid in a cylinder 26, which is closed at both ends of the axial direction by a main bearing member and a sub-bearing member, and the compression element is accommodated by the main bearing member. In the fluid compressor which consists of a cylindrical sealing case 21 which supports and compresses the working fluid gradually by conveying the working fluid from the suction side to the discharge side of the cylinder 26 by the operation of the braid and the rotating body 29, The said airtight sealing A support mechanism (17B) is provided in the case (21) to support the sub-bearing member (28) and to move freely in a plane perpendicular to the axis center of the cylinder (26) and the rotating body (29). 26) and the fluid, characterized in that the support mechanism 17B is fixed directly to the sealed case 21 by filling an adhesive into the recess provided in the support mechanism 17B after the shaft center adjustment of the rotor 29. compressor.