JPH0267486A - Scroll type compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention relates to a scroll compressor that compresses gas to be compressed in a compression chamber that is a compression space between a fixed scroll and an orbiting scroll. In particular, the present invention relates to improvements in the mounting structure of a discharge guide mechanism for extracting and guiding compressed gas compressed in a compression chamber and a release mechanism for lowering the compression capacity as required.

(Prior art) Compared to commonly used reciprocating compressors and rotary compressors, there is less compression leakage during compression and higher efficiency, less torque fluctuation, and lower vibration and noise. Scroll compressors are attracting attention because they do not require a suction valve, and are highly reliable without problems such as fluid loss or damage caused by valves.

The main parts of this type of compressor are conventionally shown in FIG. 1 is a sealed case, and a frame 2 is provided inside this sealed case 1. A scroll compressor section 3 is disposed on the upper side of the frame 2, and a motor section 4 is disposed on the lower side thereof, and a crankshaft 5 is rotatably inserted through the substantially central portion of the frame 2.

The scroll compressor section 3 includes a fixed scroll 8 having a spiral wrap 7 integrally vertically disposed on the lower surface of an upper end plate 6, and an orbiting scroll 11 having a spiral wrap 10 integrally erected on the upper surface of the lower end plate 9. Consisting of Both wraps 7.10 of these fixed scroll 8 and orbiting scroll 11 are
They are combined in a state where they are superimposed on each other. on the other hand,
A discharge hole 12 is provided approximately at the center of the upper end plate 6 of the fixed scroll 8.
is provided, and a discharge cover 13 is mounted and fixed on the upper mirror plate 6. A discharge pipe 14 communicating with an external device such as a condenser (not shown) passes through the sealed case 1, and its open end communicates with the internal space of the discharge cover 13.

Further, the lower end plate 9 of the orbiting scroll 11 is supported by the frame 2, and the lower boss portion of the lower end plate 9 is inserted into the eccentric portion 5a of the crankshaft 5. The eccentric portion 5a is formed at the upper end of the crankshaft 5 at an axis eccentric from this axis by a predetermined dimension. A suction pipe 15 is connected to a part of the peripheral wall of the sealed case 1, and communicates with an external device such as an accumulator. Reference numeral 16 denotes a release tube constituting the release mechanism, one end of which passes through the upper end plate 6 of the fixed scroll 8, and its open end facing between the wraps 7. Further, the release pipe 16 passes through a discharge chamber 13a within the discharge cover 13, protrudes from the discharge cover 13, penetrates the sealed case 1, and communicates with the midway portion of the suction pipe 15. Such a release pipe 16 is provided with a valve mechanism (not shown) in the middle thereof that can be opened and closed as necessary.

In addition to this, the release mechanism may include, for example, a release chamber provided adjacent to the discharge cover 13 or within the discharge chamber 13a, and the release chamber connected to the upper mirror via the release chamber and the discharge chamber 13a. Some are provided with a release tube that passes through i26.

The electric motor section 4 includes a rotor 17 fitted to the crankshaft 5 at a lower portion of the frame 2, and a stator 18 fixed to the outer peripheral surface of the rotor 17 with a narrow gap.

In the scroll compressor configured in this manner, the crankshaft 5 is rotationally driven by energizing the electric motor section 4, and the orbiting scroll 11 rotates. Along with this, the compression chamber S, which is a substantially crescent-shaped compression space formed between the wrap 10 of the orbiting scroll 11 and the wrap 7 of the fixed scroll 8, changes continuously. A gas to be compressed, such as a refrigerant gas, is once discharged into the sealed case 1 from an external device, such as an accumulator, through a suction pipe 15. That is, it is a so-called low pressure type compressor. This refrigerant gas is sucked into the compression chamber S through a suction passage (not shown) provided in the frame 2, is gradually compressed in a spiral shape toward the center along with the orbiting movement of the orbiting scroll 11, and is converted into high-pressure gas. Ru. Then, it is discharged from the discharge hole 12 into the discharge chamber 13a in the discharge cover 13, where it is muffled and discharge pressure pulsation is controlled, and then guided from the discharge pipe 14 to an external device, such as a condenser.

By the way, in the scroll type compressor constructed in this way, like the normally used rotary type compressor,
Activate the release mechanism as necessary. That is, this is based on the reduction of the amount of refrigerant circulation, and can be achieved by opening the cylinder in a normal rotary compressor and by opening the release pipe 16 in such a scroll compressor. Then, a part of the compressed gas in the middle of compression is returned from the compression chamber S to the suction side of the compressor, where it joins with the compressed gas on the suction side, and thereafter a normal compression stroke is performed. In this way, by bypassing a part of the gas during compression, the compression work is reduced at the same time as the refrigerating capacity is reduced, and power consumption can be reduced without lowering the so-called COP. Specifically, the release port is opened, for example, during nighttime cooling when the cooling load is light, or when the desired room temperature is reached.

(Problem to be Solved by the Invention) In such a low-pressure scroll type compressor, the high-pressure gas compressed in the compression chamber S is once discharged to the discharge chamber 13a, which is inside the discharge force bar 13, to muffle the sound and discharge the gas. As described above, pressure pulsation is reduced, and in order to ensure the desired effect, the capacity of the discharge cover 13 must be increased.

However, the outer diameter dimension of the sealed case 1 is set to the required capacity of the scroll compressor section 3 and the electric motor section 4, and the minimum necessary margin. Further, the area of the upper end plate 6 of the fixed scroll 8 to which the discharge cover 13 is attached and fixed is also suppressed to the necessary minimum diameter. For these reasons, the height and diameter of the discharge cover 13 are necessarily set, and the discharge chamber 13a formed inside the discharge cover 13 is inevitably set.
It was not possible to provide a sufficient capacity for this, and therefore the effects of muffling noise and reducing discharge pressure pulsations were insufficient. Moreover, the release pipe 16 has an opening at one end passing through the upper part 6 of the fixed scroll 8, a middle part passing through the discharge chamber 13a and protruding from the discharge cover 13, and further passing through the sealed case 1, respectively. It is attached and fixed to.

For this reason, the release tube 16 requires welding and installation work such as silver brazing for the three component parts, which increases the number of man-hours required to install these parts, resulting in problems such as poor assembly performance.

The present invention was made in response to the above circumstances, and aims to increase the capacity of the discharge chamber that receives high-pressure gas without changing the dimensions of the sealing cover or discharge cover, thereby muffling noise and reducing discharge pressure pulsations. It is an object of the present invention to provide a scroll compressor which can obtain a sufficient reduction effect and improve the ease of processing and assembling parts, especially for the release mechanism.

[Structure of the invention]

(Means for Solving the Problems) That is, the present invention is a low-pressure scroll compressor that once sucks compressed gas into a closed case and guides it to a compression chamber formed between a fixed scroll and an orbiting scroll, The compressed gas compressed in the compression chamber is discharged into the discharge cover attached to the end plate constituting the fixed scroll, and if necessary, the compressed gas in the middle of compression is discharged in the compression chamber in order to reduce the compression capacity. Equipped with a release mechanism that takes the scroll out of the compression chamber and guides it to the suction side, a discharge recess and a release recess are provided on the end plate surface constituting the fixed scroll, and the opening surface of the discharge recess is open and the release A scroll type characterized in that a partition plate that closes the opening surface of the release recess is interposed between the end plate and the discharge cover, and the release mechanism is connected to the release recess through the peripheral wall of the end plate. It is a compressor.

(Function) With this configuration, the discharge chamber capacity is the sum of the original discharge cover interior and the discharge recess newly formed in the end plate of the fixed scroll, and the dimensions of the sealing cover and discharge cover are Without modification, the discharge chamber capacity is increased compared to the conventional one. Moreover, the installation process of the release mechanism is easier than that of the conventional one.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4. The shape and structure of the upper end plate 6 constituting the fixed scroll 8 and the discharge guide mechanism 2 for the upper end plate 6 will be described below.
0 and the connection structure of the release mechanism 21, the other components may be exactly the same as those explained earlier in FIG. 5, so the same figure will be applied and new explanation will be omitted. Above upper mirror plate 6
A discharge recess 22 and a release recess 23 are provided on the upper surface side. That is, as shown in FIGS. 2 and 3, a rib 6a is left along the approximate center line of the upper mirror plate 6, and an annular portion 6b is left along the peripheral edge of the rib 6a, and the discharge recess is formed between these. 22 and the release recess 23 are opened in a substantially bisected state. A partition plate 25 is mounted on the upper surface of the upper mirror plate 6, and is interposed between the partition plate 25 and the discharge cover 13. As shown in FIG. 4, the partition plate 25 has an opening 25 having the same area only in a portion facing the discharge recess 22.
It has a. Therefore, the partition plate 25 is
and the discharge cover 13, the opening surface of the discharge recess 22 is opened, and the opening surface of the release recess 23 is closed. In other words, the inside of the discharge cover 13 and the discharge recess 22 communicate with each other via the opening 25a of the partition plate 25, and the discharge chamber 26 is formed therebetween. On the other hand, a discharge hole 27 and a release hole 28 are formed in the bottom surface of the discharge recess 22 and the release recess 23, respectively, over the wrap 7 side surface of the upper mirror plate 6. That is, the wrap 7 of the fixed scroll 8 and the orbiting scroll 11
, IC1] A compression chamber S and a discharge recess 22 formed between
and the release recess 23 communicate with each other via the discharge hole 27 and release hole 28. Furthermore, a discharge guide hole 29 and a release guide hole 30 are provided in the discharge recess 22 and the release recess 23, respectively. These discharge guide holes 29 and release guide holes 30
is opened from the outer circumferential side of each of the discharge recesses 22 and the release recesses 23 to the circumferential surface of the upper mirror plate 6 . One end of a discharge pipe 31 and a release pipe 32 are connected to each open end.

The discharge pipe 31 and the release pipe 32 each penetrate the sealed case 1 and are connected to predetermined locations. That is, the discharge guide mechanism 20 is composed of the discharge guide hole 29 and the discharge pipe 31, and the release mechanism 21 is composed of the release guide hole 30 and the release pipe 32.
are connected to each other by passing through the peripheral wall of the upper mirror plate 6.

In this way, the release mechanism 21 in particular becomes easier to mount and fix than conventional ones. Although not shown, the release mechanism 21 is provided with a conventional valve mechanism, which can be opened and closed as necessary.

Although the discharge guide mechanism 20 and the release mechanism 21 have exactly the same functions as conventional ones, the capacity of the discharge chamber 26, which once receives compressed high-pressure gas, is limited to the inside of the discharge cover 13 and the upper mirror. ! This is the combined capacity of the discharge recesses 22 of i26, and is larger than the conventional one. Therefore, the silencing effect when high-pressure gas is received is improved, and discharge pressure pulsations are reduced. Furthermore, if necessary, the gas to be compressed in the middle of compression in the compression chamber S is taken out from the compression chamber S through the release hole 28 to the release recess 23, further guided to the release pipe 32 through the release guide hole 30, and compressed. It is made to merge with the compressed gas to be sucked into the machine part 3. Therefore, since the compressed gas that is being compressed in the compression chamber S is once taken out and guided to the suction side of the compressor section 3, the compression capacity of this compressor can be lowered.

In the above embodiment, the discharge guide mechanism 20 is connected to the peripheral wall of the upper end plate 8 of the fixed scroll 6, but the present invention is not limited to this, and it goes without saying that it may be connected to the discharge cover 13, for example.

〔Effect of the invention〕

As explained above, according to the present invention, the capacity of the discharge chamber that temporarily receives the high-pressure gas compressed in the compression chamber can be increased without changing the shape structure and dimensions of components such as the sealing cover and the discharge cover. This makes it possible to achieve sufficient noise reduction and discharge pressure pulsation effects. In addition, the processing and assembly of the parts of the release mechanism become easier, which improves work efficiency and contributes to cost reduction.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, in which Figure 1 is a vertical sectional view of the main part of a scroll compressor, Figure 2 is a vertical sectional view of a part thereof, and Figure 3 is a vertical sectional view of a fixed scroll. FIG. 4 is a plan view of a partition plate, and FIG. 5 is a vertical cross-sectional view of a main part of a scroll compressor showing a conventional example of the present invention. 1... Sealed case, 8... Fixed scroll, 11.
... Orbiting scroll, S... Compression chamber, 6... (upper part of fixed scroll) end plate, 13... Discharge cover 21.
...Release mechanism, 22...Discharge recess, 23...
Release recess, 25...partition plate. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] This is a low-pressure scroll compressor that sucks compressed gas into a sealed case and guides it to a compression chamber formed between a fixed scroll and an orbiting scroll. A release mechanism is provided which discharges the compressed gas compressed in the compression chamber and, if necessary, lowers the compression capacity by taking out the compressed gas in the middle of compression from the compression chamber and guiding it to the suction side. A discharge recess and a release recess are provided on the end plate surface constituting the fixed scroll, and the end plate includes a partition plate that opens the opening surface of the discharge recess and closes the opening surface of the release recess. and the discharge cover,
A scroll compressor characterized in that the release mechanism is connected to the release recess that penetrates the peripheral wall of the end plate.