JPH065069B2 - Rising shock reduction mechanism in scroll type compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for vehicle air conditioning,
The present invention relates to a mechanism for mitigating an impact given to each part of an engine and a compressor at the time of starting the compressor, that is, a rising shock mitigation mechanism.

2. Description of the Related Art Generally, a vehicle air-conditioning compressor operates by receiving power from an engine, but since the compressor is connected to the engine at a constant rotation ratio, When the electromagnetic clutch is connected to operate the machine, at the same time when the electromagnetic clutch is connected, the refrigerant gas is discharged with the compression capacity that is the full capacity given to the compressor, that is, 100% operation. The state is obtained.
However, the fact that 100% operating state is obtained at the same time as starting causes an overload on each part of the engine and the power transmission mechanism. For example, traveling feeling is impaired and liquid compression occurs. And a problem such as accelerated wear of the clutch will occur.

Thus, in a scroll type compressor, as a method of mitigating the impact generated on the engine and each part of the compressor at the time of starting the compressor, the movable scroll piece does not make sliding contact with the fixed scroll piece when the compressor is stopped. In this state, that is, a gap is formed between both scroll pieces and a compressed space is not formed, the movable scroll piece is oscillated and rotated (revolved) in such a state that the compressed space is not formed. , A method to prevent the compression action from being obtained at the time of starting, in other words, at the time of starting, the movable scroll piece is oscillated and rotated at a revolution radius smaller than that in the normal operating state to start with a compression capacity of 0%. The method of making it do so is proposed.

FIG. 8 is a drawing showing the concrete structure of the spindle a.
When the balance weight b is mounted on the tip of the main shaft a, a large diameter portion c is provided at the tip of the main shaft a, and the large diameter portion c is provided with a drive pin d protruding from its eccentric position. Further, the large-diameter portion c is also provided with a concave portion e formed in an arc shape at the eccentric position. On the other hand, an eccentric bush i having a balance weight b is provided with an eccentric hole f corresponding to the drive pin d and a spring receiver g corresponding to the recess e, respectively, and the drive pin d is provided with respect to the eccentric hole f. And the recess e
The spring receiver g is inserted into one end of the eccentric bushing, and the spring h is interposed in the recess e between the other end and the spring receiver g. It is provided so as to obtain a state in which it is urged in the direction of forming a gap therebetween, and the movable scroll piece makes sliding contact with the fixed scroll piece until the rotation of the main shaft a reaches a certain set rotation speed at the time of startup. Without
It is provided so that a state of swinging rotation can be obtained (Japanese Patent Application Laid-open No. Sho 5).
No. 8-67903), in the same structure, since a spring is installed in the large diameter portion formed at the tip of the main shaft, the installation space for the spring is restricted and a proper spring is used. In addition to being difficult to mount, the spring is compressed almost instantaneously when the set rotational speed is reached, that is, when the centrifugal force exceeds the biasing pressure of the spring. There is a problem in that an effective shock absorbing effect cannot be obtained.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made to improve the above-mentioned problems, and there is a gap between the movable scroll piece and the fixed scroll piece, and there is a swing rotation. From the state in which the movable scroll piece slides to the fixed scroll piece and swings and rotates, the member related to the rotation preventing mechanism of the movable scroll is moved through the damper to change the time. The purpose is to enhance the shock absorbing effect by making it possible to do it slowly with plenty of time.

A means for solving the problem A fixed scroll fixedly arranged in the housing,
A drive shaft rotatably supported in the housing, and a movable shaft mounted on the end of the drive shaft via an eccentric bush so that the revolution radius can be changed and oscillatingly rotatably engaged with the fixed scroll. A scroll-type compressor including a scroll and a rotation preventing mechanism formed by a plurality of disc hole portions provided on the back surface of the movable scroll and a plurality of engaging elements that engage with the disc hole portion, the disc hole portion comprising: Is formed with a tapered surface, and the engaging element slidingly contacting the tapered surface is arranged so as to co-act in the axial direction in response to the change of the revolution radius of the movable scroll, and the engaging element in the axial direction of the engaging element. The movement is adjusted by a damper connected to the engaging element, and a spring housed in the damper is normally urged in a direction to reduce the revolution radius of the movable scroll through the engaging element and the disk hole. It is provided as it is.

Operation When the compressor is stopped, the engaging element presses the tapered surface of the disk hole with a spring, which urges the orbiting radius of the orbiting scroll to decrease, maintaining a gap with the fixed scroll. It is in a dripping state.

When the compressor is driven, a centrifugal force generated along with the rotation of the movable scroll causes a component force that opposes the spring force to act on the engaging element via the tapered surface of the disc hole portion, and the component force causes the movable scroll. The orbit radius of is increased, and the gap between the movable scroll and the fixed scroll is closed. At that time, the movable scroll piece and the fixed scroll piece are slowly slidably contacted at several points by a damper so that the movable scroll piece and the fixed scroll piece move to a state of rotating.

Specific examples of the present invention will be described below.

Embodiments FIGS. 1 to 6 are drawings showing a first embodiment, in which reference numeral 1 denotes a housing constituting an outer shell of a compressor.

The housing 1 is composed of a front housing 2 and a rear housing 3, and the front housing 2 has a front wall portion 2.
a and a peripheral wall portion 2b surrounding the outer peripheral edge of the front wall portion 2a are formed to have a bottomed cylindrical shape. And rear housing 3
Also, the rear wall portion 3a and the peripheral wall portion 3b surrounding the outer peripheral edge of the rear wall portion 3a are formed in a bottomed cylindrical shape. That is, the housing 1 is configured by integrally joining the openings of both housings 2 and 3 formed in a cylindrical shape with a bottom through screwing of bolt nuts (not shown).

A partition board 4 is fitted in the front housing 2 at a substantially intermediate portion thereof, and the partition board 4 divides the front housing 2 into two chambers, front and rear. That is, the suction chamber 5 is provided at the front wall portion 2a side, and the compression action chamber 6 is provided at the opening portion side. The suction chamber 5 and the compression action chamber 6 are provided so as to be able to communicate with each other, and the compression action chamber 6 is provided with a fixed scroll 7 and a movable scroll 8 described later.
Is formed by protruding a scroll piece 7b, which is formed in a spiral shape, from a base plate 7a fitted on the inner wall surface of the front housing 2 toward the front wall portion 2a of the front housing 2 along the opening edge of the front housing 2. The suction chamber 5 has a peripheral wall 2
A suction port 10 connected to a suction conduit (not shown) is opened in b, and a bearing portion 11 is provided in the front wall portion 2a. The drive shaft 12 is rotatably supported by the bearing portion 11. The drive shaft 12 has one end protruding outside the front housing 2 connected to an electromagnetic clutch (not shown), while the other end protruding inside the front housing 2 has a crankshaft portion 12 '.
Is provided. An eccentric bush 9 is rotatably supported on the crankshaft portion 12 ', and the crankshaft portion 1'
It is provided so as to be integrally rotatable relative to 2 '. That is, by loosely engaging the connecting pin 9'with the engaging recess 12 "provided at one end of the drive shaft 12, the eccentric bush 9 has a minute width (1-2 mm) about the crankshaft 12 '. The movable scroll 8 is rotatably and rotatably mounted on the movable scroll 8 via the eccentric bush 9 and the bearing 17.

The orbiting scroll 8 comprises a base 8a and a scroll piece 8b which protrudes from the base 8a in a spiral shape in the direction of the fixed scroll 7, and the scroll piece 8b is wound around the scroll piece 7b on the fixed scroll 7 side. Are provided differently. The scroll piece 8b is attached to the base 7a on the fixed scroll 7 side and the scroll piece 7b.
b is provided so as to be capable of sliding contact with the movable scroll 8 side base 8a, respectively, and both scroll pieces 7b, 8b are slidably contacted at a plurality of locations (at least two locations or more) so that a compression space is formed therebetween. Provided as much as possible.

Further, as a rotation preventing mechanism of the movable scroll 8, a plurality of disc hole portions 18, 18 formed in a shallow hole shape having a tapered surface 18a on the inner wall portion on the back surface of the base 8a are deviated from the center position. Are arranged on the same circumference, and
Oil dampers 19 and 19 are fixed to the partitioning plate 4 so as to face the disk holes 18 and 18, respectively.
Engagement pins 20, 20, which are engagement elements, are provided in 19 so as to be capable of advancing and retracting. More specifically, the damper chamber formed in the oil damper 19 is a pair of front and rear damper chambers 2 provided by a spool 21 connected to the base of the engagement pin 20.
It is provided by being divided into 2a and 22b. Both damper chambers 2
2a and 22b are filled with oil, and the oil is provided so as to be able to flow to each other through a small hole 24 opened in the spool 21. Also, one of the damper chambers 2
A spring 25 is interposed in 2a and is provided so that the head of the engagement pin 20 is normally biased toward the disc hole portion 18 direction. The head of the engagement pin 20 has a tapered surface 20a and is formed into a truncated cone shape. The tapered surface 20a is formed into a tapered surface 18a formed in the disk hole portion 18 through the biasing force of the spring 25. It is provided so as to be capable of sliding contact with each other. The damper chambers 22a and 22b may be filled with gas instead of oil. On the other hand, the base 7a of the fixed scroll 7 is fitted into the opening of the front housing 2 as described above,
A discharge chamber 13 is formed between the base 7a and the rear wall portion 3a on the rear housing 3 side, and the discharge chamber 13 is provided with a discharge port 14 connected to a discharge conduit (not shown) in the peripheral wall portion 3b. A discharge hole 15 is opened in the base plate 7a corresponding to the center of the spiral formed by the scroll piece 7b, and a discharge valve 15 'is provided in the discharge hole 15 so as to be openable and closable.

Reference numeral 16 denotes a retainer for regulating the opening angle of the discharge valve 15 '.

In the above embodiment, the disc hole 18 and the engaging pin 2
0 is provided with tapered surfaces 18a and 20a on both sides, but it is not always necessary to provide on both sides, and it is sufficient if it is provided at least in the disc hole portion.
The head of 0 may be hemispherical.

Next, the operation of the above embodiment will be described.

FIG. 1 is a view showing a state in which the compressor has stopped its operation. The engaging pin 20 is biased by a spring 25 so that its head is deeply engaged with the disc hole 18. Since the head of the engaging pin 20 is deeply engaged with the disk hole 18 in this manner, the orbiting radius of the orbiting scroll 8 (the distance between the drive shaft 12 and the center of the eccentric bush 9) is increased. Is regulated to a length of l ₂ through the displacement action of the eccentric bush 9 with respect to the center of the drive shaft 12, and a gap is formed over the entire circumferential surface between the scroll pieces 7b and 8b. It is in a broken state.

Then, in such a state, the driving force of the engine is transmitted to the drive shaft 12 through the connecting operation of an electromagnetic clutch (not shown) provided at one end of the drive shaft 12, whereby the crankshaft portion 12 ′ of the drive shaft 12 is transmitted. The orbiting movable scroll 8 swings (revolves) in a state where its rotation is restricted.
However, as described above, the revolution radius of the orbiting scroll 8 is restricted to the length of l ₂ and a gap is formed over the entire circumferential surface between the scrolls 7b and 8b. As a result, no compression effect is obtained. That is, 0%
A compressed state of starting up is obtained.

On the other hand, when the movable scroll 8 swings and rotates, centrifugal force is generated in the movable scroll 8. However, the rotational speed of the movable scroll 8 increases, and the tapered surface 18a generated by the centrifugal force. In the state in which the component force in the direction of the damper 19 exceeds the biasing pressure of the spring 25, the component pin retracts due to the component force and its head engages the disc hole 18 shallowly. Is obtained. In this way, the state in which the head portion of the engagement pin 20 is shallowly engaged with the disk hole portion 18 is obtained, and thus the revolution radius of the movable scroll 8 is l ₁ through the displacement action of the eccentric bush 9. It becomes the length, and both scroll pieces 7b, 8
In b, a state of sliding contact at a plurality of points is obtained.

That is, a compression space is formed between the scroll pieces 7b and 8b, and a state in which the refrigerant gas is compressed in the compression space, that is, a normal operating state can be obtained. The engagement pin 20 is a damper 19
In the damper 19, the spool 21 sends the oil in the damper chamber 22a to the damper chamber 22b side through the small hole 24, that is, the amount of oil flow is small by the small hole 24. By moving toward the damper chamber 22a in the regulated state, an action of slowly retracting the engagement pin 20 with a time margin is obtained.

In this way, the engaging pin 20 is slowly retracted in this manner, whereby the scroll pieces 7 in the movable scroll 8 are moved.
Change from the state of rocking rotation with a gap between b and 8b (0% operation) to the state of rocking operation due to both scroll pieces 7b and 8b slidingly contacting at a plurality of points (100% operation). It is possible to obtain an action that is performed slowly with a certain margin, that is, a smooth rising action.

When the operation of the scroll compressor is stopped, the centrifugal force acting on the movable scroll 8 disappears, and the engagement pin 20
Is released from the component force of the centrifugal force that has been retracted against the biasing force of the spring 25. By releasing the centrifugal force, the spool 21 provided in the damper 19 is pushed up by the urging force of the spring 25.
The head of the engaging pin 20 fixed to the spool 21 returns to a state of being deeply engaged with the disc hole 18 provided in the movable scroll 8 again. Then, the revolution radius of the orbiting scroll is reduced, and a gap is formed between the orbiting scroll and the fixed scroll.

A second embodiment in which the present invention is applied to another rotation preventing mechanism will be described below with reference to FIG. 7 only regarding the portions different from the first embodiment. The spool 21 of the damper 19 is a movable plate via a rod 21 '. A taper hole 31 is formed at a position of the movable plate 30 substantially corresponding to the disk hole 18 provided in the movable scroll 8 of the movable plate 30. Then, the ball 32 is swingably inserted into the disk hole 18 and the tapered hole 31, and is sandwiched by the bottom surface of the disk hole 18 and the partition plate 4 '.

In the second embodiment, FIG. 7 is a view showing a state in which the compressor is in operation, in which the movable plate 30 fixed to the spool 21 via the rod 21 ′ rotates the movable scroll 8. Due to the axial component force of the accompanying centrifugal force, the spring 2
The partition plate 4'is pressed against the urging force of No. 5 and the state where the scroll pieces 7b and 8b are in sliding contact with each other (100% operation) is obtained. Further, when the compressor is gently stopped, the centrifugal force generated in the movable scroll 8 disappears, so that the spool 21 moves to the movable scroll 8 side by the urging force of the spring 25, so that the ball 32 moves. It moves in the outer peripheral direction along the tapered surface 31 ′ of the plate 30.

As the ball 32 moves in the outer peripheral direction in this manner, a gap is created between the scroll pieces 7b and 8b, and at the time of start-up, the gap is created between the scrolls and the operation is started from the state of swinging rotation (0% operation). The scroll 19 is started, and there is a time margin due to the action of the damper 19, so that both scroll pieces 7b, 8b
Is in sliding contact with multiple points and swings (100%
Operation, and a smooth rising action can be obtained.

EFFECTS OF THE INVENTION The present invention is configured as described above, and by configuring as described above, the movable scroll is moved from the state in which the movable scroll swings and rotates with a gap formed between the movable scroll and the fixed scroll. It is possible to change slowly to a state in which it swings and rotates due to sliding contact with the fixed scroll at multiple points, with sufficient time, which effectively mitigate the start-up shock at startup. I was able to do it. Further, the movable scroll is started in a state in which there is a gap with respect to the fixed scroll, so that the liquid compression due to the refrigerant gas remaining in a liquefied state in the compression space in the previous operation is suppressed. It came to be able to eliminate the occurrence effectively.

[Brief description of drawings]

1 to 6 are drawings showing a first embodiment, FIG. 1 is a side sectional view showing the entire scroll type compressor, and FIG. 2 is a side sectional view showing a main part showing the same operating state. Figure, third
The drawing is a sectional view taken along the line AA, FIG. 4 is a sectional view taken along the line BB, FIG. 5 is a sectional view taken along the line CC, and FIG. 6 is an operation explanatory view showing the movement of the eccentric bush portion. FIG. 7 is a drawing showing a second embodiment and is a side sectional view showing the whole scroll type compressor. FIG. 8 is an exploded perspective view of the conventional structure. 1 is a housing, 2 front housing, 2a front wall,
2b peripheral wall portion, 3 rear housing, 3a rear wall portion, 3b peripheral wall portion, 4 partition board, 5 suction chamber, 6 compression action chamber, 7 fixed scroll, 7a base, 7b scroll piece, 8 movable scroll, 8a base, 8b scroll One, 9 eccentric bush,
9'connecting pin, 10 suction port, 11 bearing part, 12 drive shaft, 12 'crankshaft part, 12 "engaging recess, 13 discharge chamber, 14 discharge port, 15 discharge hole, 15' discharge valve, 16 retainer, 17 bearings, 18 disc holes, 18a tapered surface, 19 oil damper, 20 engagement pin, 20a tapered surface, 21 spool, 22a, 22b damper chamber, 2
4 small holes, 25 springs, 30 movable plates, 31 tapered holes, 32
ball.

Claims (1)

[Claims] 1. A fixed scroll 7 disposed fixed in the housing 1, a drive shaft 12 which is rotatably supported in the housing 1, eccentric to the ends of the drive shaft 12 the bush 9
A movable scroll 8 mounted so that the revolution radius can be varied via the movable scroll 8 and engaged with the fixed scroll 7 so as to swing and rotate, a plurality of disk hole portions 18 provided on the back surface of the movable scroll 8, and In a scroll compressor provided with a rotation preventing mechanism formed by a plurality of engaging elements 20 that engage with the disc hole portion 18, a tapered surface 18a is formed in the disc hole portion 18, and the tapered surface 18a is formed. The slidable engagement element 20 is arranged so as to co-act in the axial direction in response to the variation of the revolution radius of the movable scroll 8, and the movement of the engagement element 20 in the axial direction is caused by the engagement element 20. The movable scroll 8 is adjusted by a damper 19 connected thereto and is always housed in the damper 19 through the engaging element 20 and the disc hole portion 18.
Rising shock mitigating mechanism in a scroll type compressor configured to urge the orbiting radius of the compressor in a direction to reduce the revolution radius.