JP5661436B2 - Fluid machinery - Google Patents

Description

  The present invention relates to a fluid machine, and more particularly to a fluid machine in which weight reduction and space saving are realized by improving a rigidity increasing structure of a housing.

  As a fluid machine that compresses or expands a fluid using a rotational force, for example, a scroll compressor is known. Such a scroll compressor is often provided with a rigidity increasing structure such as a reinforcing rib in the housing in order to prevent deformation due to tensile stress or the like derived from rotational force. For example, Patent Document 1 discloses a scroll compressor in which a reinforcing rib that locally fills a concave curved portion is formed in a concave curved portion of a housing.

Japanese Patent No. 3227293

  However, when the rotational force is transmitted from the external drive source to the pulley attached to the fluid machine via the belt, the tensile stress acts on the housing due to the belt tension in the region where the pulley and the belt are in contact with each other and the belt tension is generated. In other regions, the compressive stress acts on the housing due to the belt tension. In this case, high rigidity is required in the region where tensile stress acts on the housing due to the belt tension, while high rigidity is not required in the region where compressive stress acts, while preventing the housing from being broken or the like. . However, in the scroll compressor described in Patent Document 1, such a difference in rigidity is not considered at all. In particular, in a vehicle air conditioner where installation space is limited and the requirements for weight reduction are severe, the reinforcing ribs not only contribute to the weight increase, but may interfere with other parts and hinder the installation. For this reason, it is desirable that the number of reinforcing ribs provided in the housing be as small as possible.

In order to solve the above problems, a fluid machine according to the present invention includes a pulley rotatably supported by a housing, and an endless belt wound around the pulley is driven so as to wrap a part of the outer periphery of the pulley. A fluid machine that compresses or expands the fluid using the rotational force of the pulley rotated by
The housing is configured such that rigidity in a region outside the range of the belt wrap angle is smaller than rigidity in a region within the range of the belt wrap angle as viewed from the rotation axis of the pulley. Consists of things.

  According to such a fluid machine according to the present invention, in the housing of the fluid machine in which the belt passing direction can be specified, the rigidity increasing structure of the portion where the unnecessary rigidity increase is unnecessary is eliminated as much as possible, thereby reducing the weight. It becomes possible to plan. In addition, the rigidity in this application represents the displacement characteristic when a unit (predetermined) load is added to the rigidity evaluation object direction of the structure, that is, the difficulty of displacement (deformation). Since a large tensile stress is generated in the region within the range of the belt wrap angle due to the belt tension applied when the belt is driven, it is desirable to prevent the housing from being broken by a rigidity increasing structure such as a reinforcing rib. On the other hand, in a region outside the range of the belt wrap angle, the force acting on the belt tension is a compressive stress, so that a higher rigidity is not required than in a region within the range of the belt wrap angle. Therefore, in a region outside the range of the belt wrap angle, the weight can be reduced by eliminating the rigidity increasing structure such as the reinforcing rib.

  The housing is preferably provided with reinforcing ribs only in a region within the range of the belt wrap angle. According to such a structure, the reinforcing rib is provided only in the region where a large tensile stress is generated by the belt tension, and the reinforcing rib is omitted in the other region. , Space saving and cost reduction can be achieved. Further, by omitting the reinforcing rib, the possibility of interfering with other devices at the time of attachment is reduced, so that the mountability of the fluid machine is improved.

  Further, it is preferable that a meat steal is formed only in a region outside the range of the belt wrap angle in the housing. In areas outside the belt wrap angle range, the force acting on the belt tension is compressive stress, and high rigidity is not required, so weight reduction is achieved without reducing the substantial strength by forming a meat steal. And cost is also reduced.

  The fluid machine according to the present invention is suitable for application to a compressor of a vehicle air conditioner, which is required to save space and be light.

  According to the fluid machine of the present invention, the housing is configured so that the rigidity in the region outside the belt wrap angle is smaller than the rigidity in the region within the belt wrap angle as viewed from the rotation axis of the pulley. Therefore, weight reduction, space saving, and cost reduction can be achieved while ensuring the rigidity of the necessary part.

It is a perspective view of a fluid machine concerning one embodiment of the present invention. It is a longitudinal cross-sectional view of the fluid machine shown in FIG. It is a perspective view of the conventional fluid machine.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a fluid machine according to an embodiment of the present invention, and particularly shows an example in which the present invention is applied to a scroll compressor. 1A shows a state in which a pulley is removed from the scroll compressor 1 for explanation, and FIG. 1B shows a state in which a pulley and a belt 3 are removed from the compressor 1 for explanation. ing. In FIG. 1A, the belt wrap angle 2 is an opening when a region in which the belt 3 is wound around a part of the outer periphery of a pulley (not shown) and is curved is viewed from the rotating shaft 4 of the pulley. It represents an angle. Due to the tension of the belt 3, a tensile stress acts in a region within the range of the belt wrap angle 2 of the housing, and a compressive stress acts in a region outside the range of the belt wrap angle 2. In the area within the belt wrap angle 2, the reinforcing rib 5 is provided on the front housing 6 to prevent the housing from being broken. On the other hand, the reinforcing ribs are omitted in the region outside the range of the belt wrap angle 2, thereby realizing weight reduction and space saving. In particular, in vehicle air conditioners, the engine may be provided with ribs for attachment of auxiliary equipment, etc. or for securing rigidity. Is reduced, and mountability is improved.

  FIG. 2 shows a longitudinal sectional view of the compressor 1 shown in FIG. In FIG. 2, the compressor 1 has a scroll type compression mechanism 8 in a space surrounded by the rear housing 7 and the front housing 6, and the compression mechanism 8 compresses the fluid to be compressed. The compression mechanism 8 includes a fixed scroll 9 and a movable scroll 10 that performs a turning motion with respect to the fixed scroll 9 in a state in which the rotation is blocked by a rotation blocking mechanism (not shown). A fluid to be compressed (for example, a refrigerant) introduced into the compression mechanism 8 is compressed in a compression chamber that is formed between the movable scroll 10 and the fixed scroll 9 through the turning motion of the movable scroll 10 and moves in the central direction. A rotational driving force from an external driving source (not shown) is transmitted to the movable scroll 10 via the belt 3, a pulley attached to the rotating shaft 4, the rotating shaft 4 inserted through the front housing, and the crank mechanism 11. The Due to the tension of the belt 3, tensile stress acts in the region within the belt wrap angle 2 (that is, the upper side in FIG. 2), and in the region outside the belt wrap angle 2 (ie, the lower side in FIG. 2). Compressive stress acts. The front housing 6 is formed with the meat stealer 12 only in a region outside the range of the belt wrap angle 2, and weight reduction is achieved while maintaining the necessary strength.

  FIG. 3 shows a conventional scroll compressor 21 for comparison. In FIG. 3, a pulley 13 is attached to the rotating shaft 4 of the compressor 21, and a belt 3 as an external drive source is wound around the outer periphery of the pulley 13. The front housing 6 is provided with reinforcing ribs 5 not only in the region within the range of the belt wrap angle 2, but also in the region outside the range of the belt wrap angle 2, thereby enhancing the rigidity of the housing. In such a conventional compressor 1, as compared with the compressor 1 to which the present invention is applied, the weight is increased by the amount of the reinforcing rib 5 provided in the region outside the range of the belt wrap angle 2, Weight reduction is impeded. Further, since the reinforcing rib 5 is provided in a region outside the range of the belt wrap angle 2, the possibility of interference with other devices such as an engine at the time of attachment increases, and the mountability decreases.

  The fluid machine according to the present invention can be applied to all types of fluid machines that use a belt around a part of the outer periphery of a pulley as a drive source, and is particularly suitable for application to a compressor of a vehicle air conditioner. Is.

DESCRIPTION OF SYMBOLS 1, 21 Compressor 2 Belt wrap angle 3 Belt 4 Rotating shaft 5 Reinforcement rib 6 Front housing 7 Rear housing 8 Compression mechanism 9 Fixed scroll 10 Movable scroll 11 Crank mechanism 12 Meat stealing 13 Pulley

Claims (4)

A pulley having a pulley rotatably supported by a housing, and a fluid using the rotational force of the pulley rotated by driving an endless belt wound around the pulley so as to wrap a part of the outer periphery of the pulley. A fluid machine that compresses or expands
The housing is configured such that rigidity in a region outside the range of the belt wrap angle is smaller than rigidity in a region within the range of the belt wrap angle as viewed from the rotation axis of the pulley. Fluid machinery.   The fluid machine according to claim 1, wherein the housing is provided with reinforcing ribs only in a region within the range of the belt wrap angle.   The fluid machine according to claim 1 or 2, wherein a meat theft is formed only in a region outside the range of the belt wrap angle in the housing. The fluid machine according to claim 1, wherein the fluid machine is used as a compressor of a vehicle air conditioner.

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