JP2960152B2 - Variable capacity rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to, for example, a release that separates two cylinders by an intermediate partition plate and communicates / closes the two cylinders according to an operation state. The present invention relates to a variable capacity rotary compressor having a mechanism.

(Prior Art) For example, a rotary compressor used in a refrigeration cycle or the like includes two cylinders, compresses refrigerant gas in the two cylinders, and has a higher refrigerating capacity than one having only one cylinder. There is something big. In addition, 2
Among rotary compressors of the type having three cylinders, there is a rotary compressor of a variable capacity type in which a release mechanism for releasing the refrigerant gas of one cylinder to the other cylinder is provided so that the refrigerating capacity can be adjusted.

In addition, as a release method of the rotary compressor of the variable capacity type as described above, a release mechanism is built in an intermediate partition plate interposed between the two cylinders to partition the two cylinders,
There is a method of passing a refrigerant gas through an intermediate partition plate. In this release method, the route is shortened, and
Since the mechanism is simple, there is an advantage that release efficiency is high.

(Problems to be Solved by the Invention) In a variable capacity rotary compressor, the distance between the main bearing and the sub bearing that support the crankshaft with both cylinders interposed therebetween is determined by the shaft bending caused by the compression of the refrigerant gas. Affects power. For this reason, unless the distance between the two bearings is set short, the bending force of the shaft becomes large, uneven wear occurs on the shaft, and the compression loss increases.

Therefore, in the rotary compressor of the variable capacity type, in order to shorten the distance between the two bearings, it is necessary to set the intermediate partition plate disposed between the two bearings as thin as possible.

However, when the release mechanism is built in the intermediate partition, the thickness of the intermediate partition is increased by the size of the release mechanism, and it is difficult to set the intermediate partition thinner.

The object of the present invention is that the release efficiency is high,
Another object of the present invention is to provide a variable capacity rotary compressor capable of setting an intermediate partition plate thin.

[Structure of the Invention] (Means and Actions for Solving the Problems) In order to achieve the above object, the present invention has two cylinders, partitions both cylinders by an intermediate partition plate, and operates between the two cylinders. In a variable capacity rotary compressor including a compression mechanism section having a release mechanism section that communicates and closes according to a state, a motor section, and a comp case that houses the compression mechanism section and the motor section,
A rotatable release rotary valve that incorporates the release mechanism into the two cylinders, passes through the intermediate partition plate, and forms a communication passage that straddles the two cylinders, and the release rotary attached to the comp case. The release rotary valve is constituted by a trigger that causes the release rotary valve to communicate and close the communication path, and the release rotary valve is provided with a lever portion protruding from an outer peripheral portion of the intermediate partition plate, The configuration is such that the distal end of the trigger is abutted reciprocally on the lever.

By doing so, the present invention is to make the intermediate partition plate thinner without lowering the release efficiency.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7B.

FIGS. 1 and 2 show a main part of an embodiment of the present invention. In the drawings, reference numeral 1 denotes a compression mechanism of a variable capacity rotary compressor used in a refrigeration cycle, for example. The compression mechanism 1 includes first and second two cylindrical cylinders 2 and 3, an intermediate partition plate 4 disposed between the two cylinders 2 and 3, and two cylinders 2 and 3.
And a main bearing 6 for supporting the crankshaft 5
And a sub bearing 7 and the like.

The crankshaft 5 has first and second crankshaft portions 8 and 9 formed at lower ends thereof, and the crankshaft portions 8 and 9 are located in the two cylinders 2 and 3. The crankshaft 5 has cylindrical rollers 10a and 10b exterior to the crankshaft portions 8 and 9, and the rollers 10a and 1
A crescent-shaped compression space 11, 12 is formed between the outer peripheral surface of Ob and the inner peripheral surface of each of the cylinders 2, 3.

Here, reference numeral 2a in FIG. 1 indicates a blade that advances and retreats in accordance with the movement of the roller 10a while the tip of the roller 10a is compressed, and partitions the compression space 11 in an airtight manner.

The main bearing 6 and the sub bearing 7 are bossed
It has flanges 6a, 7a and flanges 6b, 7b, and is concentrically mounted on the main shaft 13 and the sub shaft 14 of the crankshaft 5, respectively. The main bearing 6 and the sub bearing 7 sandwich the two cylinders 2 and 3 therebetween, and the flange portions 6a and 7a are brought into airtight contact with the two cylinders 2 and 3.

The intermediate partition plate 4 is formed in a disk shape having a substantially constant thickness, and its outer diameter is set smaller than the outer diameters of the two cylinders 2 and 3. Further, the intermediate partition plate 4 is sandwiched between the two cylinders 2 and 3, and partitions the two cylinders 2 and 3 to hermetically partition the compression spaces 11 and 12.

The intermediate partition plate 4 is formed with a perfect circular round hole 15 penetrating in the thickness direction. Further, a part of the intermediate partition plate 4 is cut out in a fan shape with the round hole 15 as a center, and a notch portion 16 communicating with the round hole 15 is formed.

Further, the cylinders 2 and 3 are provided with through holes 17 and 18 extending in the thickness direction. The through holes 17 and 18 communicate with the round holes 15 provided in the intermediate partition plate 4. And
By both through holes 17, 18, round hole 15, and notch 16,
A valve storage chamber 19 straddling the two cylinders 2 and 3 and adjacent to the compression spaces 11 and 12 is formed.

Further, the two cylinders 2 and 3 are located in the middle part in the thickness direction of the two cylinders 2 and 3 and extend in the radial direction of the two cylinders 2 and 3 and are arranged vertically. Release ports 20 and 21 are formed at the opening 19 and 19.

Reference numeral 22 in FIGS. 1 and 2 denotes a release rotary valve (hereinafter, referred to as a rotary valve).
As shown in FIG. 3, the rotary valve 22 includes a column-shaped valve body 23 and a plate-shaped lever portion 24 integrally projecting from the outer periphery of the valve body 23.

Further, the rotary valve 22 has a recess 25 formed in the valve body 23 and opened in the outer peripheral surface and extending along the axial direction. Further, the rotary valve 22 has the lever portion 24 located at the axially intermediate portion of the valve body 23 and projects substantially perpendicularly from the valve body 23 on the back side of the concave portion 25.

As shown in FIGS. 1 and 2, the rotary valve 22 is housed in the valve housing chamber 19 with the axial direction of the valve body 23 along the thickness direction of the cylinder. The recess 25 is directed inward while facing outward. Further, the rotary valve 22 positions the lever portion 24 inside the notch 16 of the intermediate partition plate 4. The rotary valve 22 is supported by stoppers 26, 26 arranged in the valve storage chamber 19 so as to be able to rotate around the axis.

The rotary valve 22 communicates the recess 25 with the release ports 20 and 21 of the cylinders 2 and 3 and is constituted by the recess 25 and the release ports 20 and 21 to communicate the compression spaces 11 and 12. A communication passage 27 is formed.

A V-shaped leaf spring is provided in the notch 16 of the intermediate partition plate 4.
The leaf spring 28 is sandwiched between the wall surface 16a of the notch 16 and the lever portion 24 of the rotary valve 22 with both ends thereof facing the outside of the intermediate partition plate 4. .

A trigger is shown at 29 in FIG. This trigger 29
Is composed of a trigger body 30 shown in FIG. 5 and an exciting coil 31 combined with the trigger body 30.

The trigger main body 30 includes a stepped cylindrical first case 32, a cylindrical second case 33 whose inner diameter is set to be substantially the same as the inner diameter of the first case 32, and both these cases 32. , 33
And a third case 34 that concentrically connects the two. Further, in the trigger body 30, a plunger shaft 35 is housed in a first case 32, and an excitation core 36 is housed in a second case 33.
And a coil spring 37.

Further, the trigger body 30 has a screw portion 38 formed on the outer periphery of the third case 34. The trigger body 30 has a screw portion 38 screwed to a comp case 39 containing the compression mechanism portion 1 and an electric motor portion (not shown), and is connected to the comp case 39. The trigger body 30 penetrates the comp case 39, and the first case 32 is attached to the comp case 39.
, And the second case 33 is located outside the comp case 39.

Further, welding is performed at the boundary between the first case 32 and the third case 34 and at the boundary between the second case 33 and the third case 34. In addition, the boundary between the third case 34 and the comp case 39 located outside the comp case 39 is also welded.

The plunger shaft 35 is housed in the first case 32 so as to be able to advance and retreat along the axial direction, and the tip 40 protrudes from the first case 32 whose tip is narrowed. Further, the plunger shaft 35 has a distal end portion 40 formed of a trigger ball 42 made of a hard metal which is harder than the plunger shaft main body 41, and the trigger ball 42 is exposed.

The plunger shafts 35 are spaced apart from each other in the axial direction of the plunger shaft 35, and the outer peripheral surface thereof is in the first case 32
It is held by annular plunger holders 43 that are in contact with the inner peripheral surface of (or the second case 33). The base end surface of the plunger shaft 35 is in contact with the coil spring 37 in the second case 33.

Further, the plunger shaft 35 has a plunger shaft side release hole 44 which opens at a central portion of the base end surface of the plunger shaft main body 41 and an outer peripheral surface at an axially intermediate portion.
Is provided. Further, the first case 32 is provided with first case-side release holes 45 for communicating the internal space of the first case 32 with the internal space of the comp case 39.

Further, as shown in FIGS. 6 (a) and (b), the plunger holder 43, 43 has a plunger holder side release hole 43a which is disposed in the circumferential direction and penetrates the plunger holder 43, 43 in the thickness direction. ... are provided.

The excitation coil 31 is arranged outside the comp case 39, and is connected to the second case 33 via a fixing tool (not shown) such as a fixing screw.

The trigger 29 and the rotary valve 22 constitute a release mechanism 46. Further, the release mechanism 46 adjusts the arrangement of the rotary valve 22 and the trigger 29 with the plunger shaft 35 protruding from the first case 32.
Of the rotary valve 22 is set to contact the lever portion 24 of the rotary valve 22 from the side.

That is, in the variable capacity rotary compressor having the above-described release mechanism 46, the seventh
As shown in FIG. 1A, the rotary valve 22 is a valve body.
The 23 concave portions 25 are connected to the release ports 20 of the two cylinders 2 and 3,
A communication path 27 is formed by communicating with the communication path 21. Then, the refrigerant gas is released from the high pressure side cylinder of the two cylinders 2 and 3 to the low pressure side cylinder through the communication passage 27, and the refrigeration capacity is adjusted.

When the release is released, the trigger 29
The plunger shaft 35 is driven by utilizing the force generated by the energization, and the plunger shaft 35 is linearly advanced in the axial direction. Then, as shown in FIG. 7B, the amount of protrusion of the plunger shaft 35 from the first case 32 is increased, and the lever portion 24 of the rotary valve 2 is pushed while the trigger ball 42 is kept in contact.

Then, the trigger 29 rotates the rotary valve 22 around the axis at a predetermined angle while elastically deforming the leaf spring 28, and changes the direction of the valve body 23 in the circumferential direction. And
The trigger 29 uses the outer peripheral surface of the valve body 23 to close the openings of the release ports 20 and 21 and to shut off the communication path 27.

When the release between the two cylinders 2 and 3 is performed again, the plunger shaft 35 retreats, and with the retraction of the plunger shaft 35, the lever 24 receives the elastic restoring force of the leaf spring 28,
The concave portion 25 of the valve body 23 is returned to the original release position.

Here, the outer diameter of the valve body 23 of the rotary valve 22 and the inner diameter of the valve storage chamber 19 are set to be substantially the same, and the outer peripheral surface of the valve main body 23 and the inner peripheral surface of the valve storage chamber 19 are separated. Leaks between them are prevented.

The size of the notch 16 is determined by the release rotary valve.
It is set in accordance with the amount of rotation displacement of 22.

The refrigerant gas that has entered the inside of the second case is guided to the inside of the first case 32 by the release holes 44 on the plunger shaft side and the release holes 43a on the plunger holder side. Further, the refrigerant gas that has entered the inside of the first case 32 is discharged into the comp case 39 through the first case side release hole.

That is, in the rotary compressor having the release mechanism 46, the release mechanism 46 is attached to the cylinders 2 and 3.
And there is no need to provide a dead space unlike the case where a release mechanism is provided outside the comp case 39.

Since the release mechanism 46 is incorporated in the two cylinders 2 and 3, the release path can be shortened and the configuration of the release mechanism 46 can be simplified.

In addition, since the release mechanism 46 straddles the intermediate partition 4 and is not built in the intermediate partition 4, the thickness of the intermediate partition 4 is not affected by the size of the release mechanism 46. Therefore, the intermediate partition plate 4 can be set thin.

Further, the distance between the main bearing 6 and the sub bearing 7 can be reduced, and the bending force applied to the crankshaft 5 can be reduced. Therefore, the occurrence of uneven wear of the crankshaft 5 can be prevented, and the efficiency can be improved.

The present invention can be variously modified without departing from the gist.

[Effects of the Invention] As described above, according to the present invention, a rotary valve constituting a release mechanism is incorporated in two cylinders and is rotatable so as to pass through an intermediate partition plate and form a communication passage extending between both cylinders. Therefore, the intermediate partition plate can be set thin without lowering the release efficiency, the shaft bending force is reduced, the compression loss is reduced, and a highly efficient variable capacity rotary compressor can be provided.

Further, since the lever portion of the rotary valve is protruded from the intermediate partition plate, and the distal end of the trigger attached to the comp case is abutted on this lever portion in a reciprocating manner, the connecting portion of the rotary valve and the trigger is connected. It has a simple structure and excellent effects such as improvement in manufacturability.

[Brief description of the drawings]

1 to 7 (b) show an essential part of one embodiment of the present invention. FIG. 1 is a plan sectional view showing a compression mechanism, and FIG. 2 is a side section showing a compression mechanism. Fig. 3 is a perspective view of the release rotary valve, Fig. 4 is a side sectional view of the trigger, Fig. 5 is a side view of the trigger main body, Fig. 6 (a) is a front view of the plunger shaft, Fig. 6 ( FIG. 7 (b) is a side view of the plunger shaft, FIG. 7 (a) is an explanatory view showing the state of the release mechanism at the time of release, and FIG. 7 (b) is an illustration showing the state of the release mechanism at the time of release of the release. FIG. 2 ... first cylinder, 3 ... second cylinder, 4 ...
Intermediate partition plate, 22 ... Release rotary valve, 27 ... Communication path, 29 ... Trigger, 46 ... Release mechanism.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-70686 (JP, A) JP-A-55-158370 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 23/00-29/10 331 F04C 18/356

Claims (1)

(57) [Claims] A compression mechanism having two cylinders, a release mechanism for partitioning the two cylinders by an intermediate partition plate, and communicating and closing the two cylinders according to an operation state; And a variable capacity rotary compressor comprising a compression case for accommodating the compression mechanism and the electric motor, wherein the release mechanism is incorporated in the two cylinders, passes through the intermediate partition plate, and is connected to the two cylinders. A rotary rotary valve that forms a straddling communication path, and a trigger that is attached to the comp case and rotates the release rotary valve to cause the release rotary valve to communicate and close the communication path. The release rotary valve is provided with a lever portion protruding from the outer peripheral portion of the intermediate partition plate. Variable capacity type rotary compressor characterized by comprising a distal end portion of the trigger is in contact reciprocably in over portion.