JPH0755339Y2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a scroll compressor used for refrigeration, air conditioning, and the like.

[Conventional technology]

FIG. 3 shows a sectional view of the scroll compressor. Reference numeral 1 is a casing, 2 is a front case fixed to the same casing, 3 is a front nose fixed to the same front case, and the above-mentioned parts 1, 2 and 3 constitute a main body C. . Reference numeral 4 is a fixed scroll, and 5 is a fixed end plate, and the above-mentioned portions denoted by reference numerals 4 and 5 form an integral fixed portion F. Reference numeral 6 is a revolving scroll, 7 is a revolving end plate, 8 is a boss provided in the central portion of the revolving end plate, and the above-mentioned portions 6, 7 and 8 form a revolving portion R integrally. . The fixed scroll 4 and orbiting scroll 6 have the same cross section, and the phase is 180
They are staggered and the centers of the scrolls are combined with a certain distance. Reference numeral 9 is a main shaft, 10 is an eccentric pin provided at the end of the main shaft, 11 is a drive bush mounted around the eccentric pin, 12 is a balance weight, and the above symbols 9, 10, 11, 12 are attached. The formed part constitutes the shaft part S. 13
Is a main bearing that rotatably supports the main shaft, 14 is the auxiliary bearing, and 15 is a slewing bearing mounted in the recess of the boss 8 of the slewing shaft. The drive bush 11 of the shaft S is fitted inside the slewing bearing. It is held rotatably. Reference numeral 16 is a ball coupling which restrains the rotation of the revolving portion R between the front case 2 and the revolving end plate 6 and receives the thrust of the revolving portion R. Reference numeral 17 is a suction chamber in the main body C, 18 is a scroll outer end opening, and 19 is a fixed portion F.
And a compression chamber formed between the swivel portion R and the swivel portion R, 20 is a fixed end plate 4
Of the discharge port, 21 is a discharge chamber, and 22 and 23 are chip seals provided at the end plate contact portions of the fixed scroll 4 and the orbiting scroll 6, respectively, for keeping the compression chamber 19 airtight. .

In the scroll compressor having the above configuration, when a rotating force is applied to the main shaft 9 from the outside, the revolving portion R is revolved,
Gas enters the suction chamber 17 through an inflow section (not shown), is taken into the compression chamber 19 through the scroll outer end opening 18, is compressed as the compression chamber 19 moves, and is then discharged from the discharge port 20. Then, it is sent to the outside from the outflow portion (not shown) through the discharge chamber 21.

When the scroll compressor described above is used as a compressor for a car air conditioner for compressing refrigerant gas, the main shaft 9 is driven by the engine, so the cooling capacity of the car air conditioner is proportional to the engine speed of the vehicle. Rise. For this reason, when the engine is running at high speed, the cooling capacity becomes excessive and the vehicle compartment becomes too cold. As a result, intermittent operation of the car air conditioner is performed, resulting in a decrease in air conditioning feeling. Further, since the work of the compressor increases when the engine speed is high, the running efficiency of the vehicle decreases. To solve this problem, the scroll compressor is provided with a capacity control mechanism.

FIG. 4 is a sectional view of a scroll portion of a scroll compressor having a pressure control mechanism. Due to the combination of the two scrolls, two identical compression chambers A and B shown below are formed at positions symmetrical with respect to the center of the scroll.

A: A compression chamber formed in contact with the inner surface of the fixed scroll 4.

B: A compression chamber formed in contact with the outer surface of the fixed scroll 4.

In order to perform the capacity control, the fixed end plate 5 is provided with a total of four bypass holes connected to these compression chambers. These bypass holes are opened or closed by the movement of the end of the orbiting scroll 6. The bypass holes are represented by a symbol H, and the names of the compression chambers and the numbers of the bypass holes which communicate with each other are added by () to distinguish each bypass hole. There are four bypass holes, H (A1), H (A2), H (B1), and H (B2), each of which is named and defined as follows.

H (A1): The first bypass hole of the compression chamber A.

A bypass hole provided in a position in contact with the inner surface of the fixed scroll 4 and opened immediately when the compression chamber A is formed.

H (A2): From the position of the second bypass hole of the compression chamber A, the first bypass hole H (A1) to the fixed scroll 4
A bypass hole that is provided along the inner surface of the car at a position advanced by a central angle of approximately 150 degrees in the turning direction.

H (B1): a first bypass hole of the compression chamber B, a bypass hole provided in contact with the outer surface of the fixed scroll 4 and opened immediately when the compression chamber B is formed.

H (B2): From the position of the second bypass hole of the compression chamber B, the first bypass hole H (B1) to the fixed scroll 4
A bypass hole that is provided along the outer surface of the car in a position advanced by a central angle of approximately 150 degrees in the turning direction.

In FIG. 4, M and N are bypass flow passages connected to the bypass holes. The mutual relationship between the bypass hole and the bypass flow path is as follows.

M: Connects to bypass holes H (A1) and H (B2).

N: Connects to the bypass holes H (B1) and H (A2).

The bypass flow passages M and N are provided inside the fixed end plate 5, and the open end communicates with the scroll outer end opening 18. A piston that functions as a valve that opens and closes the bypass hole is provided inside the bypass passage. When the bypass hole is opened, the gas in the compression chamber returns to the scroll outer end opening via the bypass flow path, and the pressure in the compression chamber decreases.

FIG. 5 is a cross-sectional view mainly showing the bypass passage and the piston portion. Although there are two bypass channels M and N, the diagram shows the bypass channel M. Symbols in the figure
The parts denoted by 1,4,5,6,18 have the same functions as the parts explained in FIG. 24 (M)
Is a piston provided in the bypass flow passage, 25 (M) is a spring pressing the piston against the bypass flow passage closed end,
Reference numeral 26 (M) is a pressurizing flow path communicating with the head of the piston, and 27 (M) is a pressure adjusting valve for adjusting the fluid pressure applied to the piston head via the pressurizing flow path.

A part 24 corresponding to each of the above parts on the bypass flow path N side
(N), 25 (N), 26 (N) and 27 (N) are provided.

In the capacity control mechanism having the above configuration, at full load, the pressure adjusting valve 27 (M) is opened to increase the pressure applied to the piston head to move the piston 24 (M) against the spring 25 (M) and bypass hole H. Close (A1) and H (B2). At the same time, although not shown in the drawing, the piston 24 (N) is also pressurized on the side of the bypass flow path N to bypass the bypass holes H (B1) and H.
Close (A2). In this way, during full load, the compression chamber is effectively utilized from the volume at the time of its formation to the final volume reduced by the movement of the compression chamber. On the other hand, when it becomes necessary to reduce the capacity of the compressor, that is, at the time of capacity control, the pressure from the compression regulating valve is lowered, and the piston 24 (M) is bypassed by the force of the spring 25 (M). By moving to the closed end of the bypass hole H (A1)
And open H (B2). At the same time, not-shown bypass holes H (B1) and H (A2) are also opened. By doing so, the refrigerant gas in the compression chamber flows out into the bypass flow passage M and the bypass flow passage N (not shown) and flows back to the scroll outer end opening portion, so that the bypass hole moves the orbiting scroll 6. Until it is closed, the compression chamber loses its compression function, resulting in a reduction in compressor capacity.

FIG. 6 shows the time when the compression chamber is formed, that is, the compression chamber volume 10
The opening range of the bypass hole is shown in the relationship diagram between the swirl angle (degree) and the compression chamber volume (%) from the time of 0% until the volume of the compression chamber becomes 0%. That is, the example in this figure is for capacity control, compression chamber formation (volume 100%)
It shows that the compression function is lost during the period from when the volume decreases to about 25%. Bypass holes are usually provided to lose the compression function between 100% and 25-40%.

[Problems to be solved by the device]

In the conventional technique, the bypass passage M is connected to the first bypass hole of the compression chamber A and the second bypass hole of the compression chamber B, and the bypass passage N is connected to the first bypass hole of the compression chamber B and the compression chamber B. The second bypass hole A is continuous. That is, during capacity control, the refrigerant gas is discharged from different compression chambers into one bypass flow passage. In such a structure, the pressure balance between the compression chambers A and B may be disrupted due to a slight difference in pressure loss between the bypass flow passage and the bypass hole, which may cause abnormal vibration.

The present invention is intended to prevent abnormal vibration by preventing the pressure balance between the compression chambers A and B from being lost.

[Means for Solving the Problems]

The present invention solves the above-mentioned problems, and as a pair of fixed and orbiting scrolls having a spiral body are moved toward the combination center side by shifting their phases by 180 degrees and separating their centers by a certain distance. A pair of symmetrical compression chambers having a reduced volume is formed, and a plurality of pairs of bypass holes are provided in the end plate of the fixed scroll along the spiral direction of the spiral body communicating with the compression chambers. The bypass holes of each pair are communicated with a pair of bypass passages whose open ends are connected to the fixed scroll end plate and are connected to the suction side, and one end of each bypass passage is biased by a spring. A piston that slides in the bypass flow path is provided at the other end to which a pressure adjusted by a pressure control valve is applied, and the piston opens and closes the bypass hole to increase the compressor capacity to the plural pairs. In a scroll compressor capable of continuously controlling the capacity determined by the position of the bypass hole on the inner side of the bypass hole, a plurality of bypass holes are arranged along the inner surface of the spiral scroll of the fixed scroll. The bypass passages are connected to one of the bypass passages, and a plurality of bypass holes are arranged along the outer surface of the spiral scroll of the fixed scroll to communicate with the other bypass passages. Out of the holes, the bypass hole on the outer side along the spiral direction of the spiral winding body is installed at a position that communicates with the compression chamber within the opening range of 360 degrees in the turning angle from the outer end of the spiral winding body, and further inside The bypass hole on the side partially overlaps the opening range of the outer bypass hole, and is installed at a position that communicates with the compression chamber in the opening range that is a maximum of 360 degrees further than the opening range of the outer bypass hole. thing It relates scroll compressor according to claim.

[Action]

According to the present invention, due to the mutual positional relationship between the bypass hole and the bypass passage, the gas discharged from one compression chamber is collected in one bypass passage again even if there are a plurality of bypass holes. Since it is discharged, conventionally, gas was discharged from a pair of different compression chambers to one bypass flow passage, which was caused by a minute difference in pressure loss between the bypass flow passage and the bypass hole. The pressure imbalance between the pair of compression chambers and the abnormal vibration resulting therefrom do not occur.

〔Example〕

FIG. 1 is a sectional view of a scroll portion according to an embodiment of the present invention. The portions denoted by reference numerals 4, 6, A, B, H (A1), H (B1), M, and N have the same structure as that of the prior art, and therefore the description thereof will be omitted. Further, the piston provided in the bypass passage and its related parts are the same as in the case of the prior art, and therefore the description thereof will be omitted. In this embodiment, the second bypass holes H (A2) and H (B2) provided in the prior art are eliminated, and instead, a new second bypass hole H '(A
2) and H '(B2) are provided. The name and definition of this new bypass hole are as follows.

H '(A2): The second bypass hole of the compression chamber A.

Fixed scroll 4 from the position of the first bypass hole H (A1)
A bypass hole that is provided along the inner surface of the vehicle at a position advanced by a central angle of about 330 degrees in the turning direction.

H '(B2): second bypass hole for compression B.

Fixed scroll 4 from the position of the first bypass hole H (B1)
A bypass hole that is located along the outer surface of the car and is advanced by a central angle of about 330 degrees in the turning direction.

The mutual relationship between the bypass passages M and N and the bypass holes is as follows.

M: Connects to bypass holes H (A1) and H '(A2).

N: Connects to the bypass holes H (B1) and H '(B2).

In other words, the position of the second bypass hole is further advanced in the turning direction by about 180 degrees as compared with the conventional case.
At the time of volume control, the refrigerant gas in the same compression chamber flows out from the same bypass passage. By this,
It is possible to prevent abnormal vibration that has conventionally been caused by the gas in different compression chambers being discharged to one bypass flow passage.

By advancing the second bypass hole 180 degrees in the turning direction, the opening range of the bypass hole at the time of capacity control is expanded, and the air conditioning feeling can be further improved during the winter season or during high-speed operation. FIG. 2 shows the opening range of the bypass hole in the relationship between the swirl angle (degree) and the compression chamber volume (%).

[Effect of device]

In the present invention, the gas discharged from one compression chamber is
Even if there are a plurality of bypass holes, it is possible to prevent the abnormal vibration due to the pressure imbalance of the compression chambers by discharging all the bypass holes together into one bypass passage.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an explanatory view of a bypass hole opening range of the above embodiment, FIG. 3 is an explanatory view of a scroll compressor action, and FIGS. 4 and 5 are prior arts. 6 is a sectional view of the conventional bypass hole opening range. 1 ... Casing, 2 ... Front case, 3 ... Front nose, 4 ... Fixed scroll, 5 ... Fixed end plate, 6 ... Orbiting scroll, 7 ... Orbiting end plate, 8 ... Boss, 9 ... Main shaft, 10 ... Eccentric pin, 11 … Drive bush, 12… Balance weight, 13… Main bearing, 14… Sub bearing, 15… Slewing bearing, 16… Ball coupling, 17… Suction chamber, 18… Scroll outer end opening, 19… Small chamber, 20 ... Discharge port, 21 ... Discharge chamber, 22 ... Fixed scroll chip seal, 23 ... Orbiting scroll chip seal, 24 ... Piston, 25 ... Spring,
26 ... Pressure flow path, 27 ... Pressure control valve, A, B ... Compression chamber, H, H '...
Bypass hole, M, N ... Bypass flow path.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-58-101288 (JP, A) JP-A-62-197684 (JP, A) JP-A-58-128487 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A pair of symmetrical compressions in which a pair of fixed and orbiting scrolls having a spiral scroll are combined with their phases shifted by 180 degrees with their centers separated by a certain distance and moved toward the center side. Forming a chamber, a plurality of pairs of bypass holes along the spiral direction of the spiral scroll communicating with the compression chamber are provided on the end plate of the fixed scroll, and each pair of bypass holes of the plurality of pairs of bypass holes are respectively formed. The fixed scroll end plate is provided with an open end that communicates with a pair of bypass flow passages that are connected to the suction side, and each pair of bypass flow passages has one end biased by a spring and the other end adjusted by a pressure control valve. A piston that slides in the bypass flow path by applying the applied pressure is provided, and the piston opens and closes the bypass hole to reduce the compressor capacity to the inside of the plurality of bypass holes. In a scroll compressor capable of continuously controlling a capacity determined by a position, a plurality of bypass holes are arranged along the inner surface of the spiral scroll of the fixed scroll and communicated with one of the pair of bypass flow paths. In addition, a plurality of bypass holes are arranged along the outer surface of the spiral scroll of the fixed scroll to communicate with the other bypass flow passage, and the spiral scroll of the spiral scroll of the plurality of bypass holes is formed. The outer side bypass hole along the direction is installed at a position that communicates with the compression chamber within the opening range of 360 degrees from the outer end of the vortex winding body, and the inner side bypass hole is further connected to the outer side bypass hole. Partially overlaps the opening range of the hole, further maximizing from the opening range of the outer bypass hole
A scroll compressor characterized by being installed at a position that communicates with the compression chamber in the opening range advanced by 360 degrees.