JPH085352Y2 - Suction throttle device for compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to a suction device provided in a compressor having a suction passage parallel to the axis of a drive shaft, such as a scroll compressor or a vane compressor. The present invention relates to a diaphragm device.

[Prior Art] It can be said that a compressor such as a scroll compressor performs compression work according to the rotation speed of a drive shaft. For this reason, for example, a compressor of this type used for air conditioning of a vehicle performs compression work according to the rotation speed of an engine that is a drive source, and an air conditioner causes an overcooling phenomenon when the vehicle speed is high, and However, the driving feeling is impaired because the desired acceleration cannot be obtained due to the load of the work of the compressor. However, if the intermittent operation of the clutch is repeated, not only the wear of the clutch is accelerated, but also the load variation of the engine becomes large, which also impairs the driving feeling of the vehicle. In order to prevent the supercooling phenomenon and reduce the load on the drive source, a compressor having a variable capacity in which the amount of fluid to be sucked is adjusted by a suction throttle valve is conventionally known. With the conventional compressor equipped with this suction throttle valve, it is necessary to perform suction throttle according to the rotational speed of the drive shaft in order to prevent the supercooling phenomenon at high vehicle speed and improve the driving feeling. Therefore, it has been necessary to provide an econder or the like for detecting a signal corresponding to the number of revolutions outside the compressor and open / close the suction throttle valve with an electromagnetic valve or the like that is excited according to the signal.

[Problems to be solved by the invention] However, if the suction throttle according to the rotational speed is performed using the encoder or the like as described above, an external control means such as an encoder or a solenoid valve is required outside the compressor, For example, when this compressor is used in a vehicle air conditioner, it must be equipped with a space.

An object of the present invention is to make it possible for a compressor to realize a suction throttle according to the number of rotations without requiring external control means.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a suction throttle device for a compressor, which is provided with a suction passage parallel to the axis of a drive shaft, wherein the suction throttle device is provided on the drive shaft. A fixed flange-shaped guide portion, a pair of fan-shaped valve bodies radially movably fitted to the guide portion, and a pair of fan-shaped valve bodies are anchored to each other, and these are attached in the centripetal direction. The fan-shaped valve element is moved into and out of the suction passage by the balance between the centrifugal force caused by the rotation of the drive shaft and the urging force of the spring member, and the effective sectional area of the suction passage is adjusted. It adopts the new means of being configured as possible.

[Operation] The flange-shaped guide portion is fixed to the drive shaft and rotates together with the drive shaft. A pair of fan-shaped valve bodies are anchored to each other by a spring member and urged in the centripetal direction and movably fitted in the guide portion in the radial direction. For this reason,
Due to the rotation of the drive shaft, centrifugal force acts on the fan-shaped valve element via the guide portion. At this time, if the rotation speed of the drive shaft exceeds the reference rotation speed that requires the suction throttle, the centrifugal force acting on the fan-shaped valve body becomes larger than the biasing force of the spring member, and the fan-shaped valve body is gradually compressed from the guide portion. It projects into the suction passage of the machine and reduces the effective cross-sectional area of the suction passage.

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

As shown in FIG. 1, the suction throttle device 7 has a flange-shaped guide portion 71 to which two pieces of fan-shaped valve bodies 73 are fitted by tension springs 72 as spring members.

A guide portion 71 having a key groove and a shaft hole in the center is formed with a guide protrusion 711 extending in the radial direction at the center of each arc portion, and stopper pins 712 are locked near both ends of each arc portion. A hole 713 is provided therethrough.

Each fan-shaped valve element 73 is formed in a hollow shape, and a guide groove 731 extending in the radial direction is formed at the center of each inside. Further, anchoring pieces 732 to which the tension springs 72 are anchored are fixed to both ends of each fan-shaped valve body 73, and stopper grooves 733 are formed in parallel with the guide groove 731 on both sides in the vicinity of both ends. In these fan-shaped valve bodies 73, guide grooves 731 are slidably fitted in the guide protrusions 711 of the guide portions 71, respectively, and thereafter stopper pins 712 are inserted from the stopper grooves 733 toward the pin holes 713. It is press-fitted, and the tension springs 72 are further anchored to the respective anchoring pieces 732.

The suction throttle device 7 is mounted on a compressor having a suction passage parallel to the axis of the drive shaft. Here, it was applied to a scroll compressor. FIG. 2 shows this variable capacity scroll type compressor.

In this compressor, a fixed scroll 10 composed of a fixed side plate 11 and a fixed scroll 12 is supported by a first housing 1, and a drive shaft 3 is provided in a second housing 2 which is connected to the first housing 1 by fastening means. It is rotatably supported. A suction passage 4 is provided in the second housing 2 in parallel with the drive shaft 3 from an external refrigeration circuit (not shown). The suction passage 4 is formed by the inner circumference of the first housing 1 and the outer wall of the fixed scroll 12. Communicates with the suction chamber 40. The suction throttle device 7 of this embodiment is fixed to the drive shaft 3 adjacent to the large diameter portion 30. Further, a drive pin 31 is eccentrically provided at the inner end of the drive shaft 3, and a counter weight 32 and an eccentric bush 33 are connected to the drive pin 31. The eccentric bush 33 supports a movable scroll 20 including a movable side plate 21 and a movable scroll 22 via a bearing 34. A rotation prevention mechanism 35 is arranged near the coupling surface of the first and second housings 1 and 2, and the rotation prevention mechanism 35 allows the movable scroll.
20 is only capable of revolving and is prevented from rotating, meshing with the fixed scroll 10, and the scrolls 10 and 20 form a compression chamber 5. Further, a discharge port 61 communicating with the compression chamber 5 of the discharge staircase is formed through the central portion of the fixed scroll 10, and the discharge port 61 is provided inside the first housing 1 via a check valve 611. A discharge chamber 6 that communicates is formed.

In this compressor, the rotation of the engine (not shown) is transmitted to the drive shaft 3 by the connection of an electromagnetic clutch (not shown), and the refrigerant gas reaches the suction chamber 40 via the suction passage 4 and from there the compression chamber 5 Introduced to. After that, the pressure of the refrigerant gas is sequentially increased due to the volume change of the compression chamber 5 due to the orbital movement of the movable scroll 20, the discharge valve 611 is pushed open from the discharge port 61, and is discharged into the discharge chamber 6 to a refrigerating circuit (not shown). Is sent out.

At this time, since the guide portion 71 is fixed to the drive shaft 3, the suction throttle device 7 rotates together with the drive shaft 3, and the fan-shaped valve body 73 fitted in the guide portion 71 also rotates together with the drive shaft 3. Therefore, due to the rotation of the drive shaft 3, a centrifugal force acts on the fan-shaped valve body 73 via the guide portion 71.

If the rotation speed of the drive shaft 3 is lower than the reference rotation speed that requires the suction throttle, the centrifugal force due to the rotation of the drive shaft 3 is small due to the biasing force of the tension spring 72, and as shown in FIG. The valve body 73 does not extend from the guide portion 71 into the suction passage 4, and the effective sectional area of the suction passage 4 is not reduced by the fan-shaped valve body 73. Therefore, at this point, the compressor is performing high capacity operation.

If the rotation speed of the drive shaft 3 exceeds the reference rotation speed that requires a suction throttle, the centrifugal force acting on the fan-shaped valve body 73 via the guide portion 71 becomes larger than the urging force of the tension spring 72, and FIG. As shown in FIG. 5, the fan-shaped valve element 73 is gradually extended from the guide portion 71 into the suction passage 4 of the compressor due to the guide groove 731 being guided by the guide protrusion 711 of the guide portion 71, and the effective sectional area of the suction passage 4 is reduced. Let Therefore, at this point, the compressor performs a small capacity operation. Even if the rotational speed of the drive shaft 3 is increased and the centrifugal force is increased, the stopper pin 712 prevents the stopper groove 733 from moving, so that the outer end surface of the fan-shaped valve body 73 corresponds to the inner wall of the suction passage 4. There is no such thing.

In the above application example, the school-type compressor is equipped with the suction throttle device 7 of the embodiment, but it may be applied to, for example, a vane compressor. In this case, the suction throttle device 7 is installed adjacent to the front side plate having the suction passage.

Further, in the suction throttle device 7 of the above embodiment, the curvature of the fan-shaped valve body 73 on the outer peripheral side is set to be smaller than the inner diameter of the second housing 2, but it may be set to be substantially the same as the inner diameter of the second housing 2. In this case, suction suction can be most performed. Further, in the suction throttle device 7 of the above-described embodiment, the guide portion 71 has a substantially disc shape, but it may have a plurality of rod shapes. In addition, the fan-shaped valve element is not limited to two pieces and may be a plurality of pieces such as three pieces.

[Advantages of the Invention] As described in detail above, in the suction throttle device of the compressor of the present invention, the fan-shaped valve element appears and disappears in the suction passage due to the balance between the centrifugal force caused by the rotation of the drive shaft and the biasing force of the spring member. Since the effective cross-sectional area of the suction passage is adjusted, the compressor can realize the suction throttle according to the rotation speed without the need for external control means.

[Brief description of drawings]

1 to 4 relate to an embodiment, FIG. 1 is an exploded perspective view of a suction throttle device, FIG. 2 is a longitudinal sectional view of a compressor equipped with the suction throttle device, and FIGS. 3 and 4 are suction throttle devices. It is a cross-sectional view of the compressor showing the operating state of the device. DESCRIPTION OF SYMBOLS 1 ... 1st housing, 10 ... Fixed scroll 2 ... 2nd housing, 20 ... Movable scroll 3 ... Drive shaft 4 ... Suction passage 5 ... Compression chamber, 6 ... Discharge chamber 7 ... Suction throttle device, 71 ... Guide part 72 ... Tension spring, 73 ... Fan-shaped valve element

Claims (1)

[Scope of utility model registration request] 1. A suction throttle device for a compressor, comprising a suction passage parallel to the axis of a drive shaft, wherein the suction throttle device is a flange-shaped guide portion fixed to the drive shaft, and the guide portion. A pair of fan-shaped valve elements that are radially movably fitted to the two, and a spring member that anchors the pair of fan-shaped valve elements to each other and biases them in the centripetal direction. A compressor, which is configured so that the centrifugal force associated with the rotation of the drive shaft and the urging force of the spring member are balanced so as to project into and retract from the suction passage and adjust the effective sectional area of the suction passage. Suction throttle device.