JPH0267485A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To hold the variable width of a release ratio wide enough by installing a releasing recess in an end plate face of a fixed scroll, closing the opening surface with a partition plate, and interconnecting the said releasing recess to a compression space through a release hole, while interconnecting this releasing recess to the suction side through a guide part. CONSTITUTION:A release mechanism 20 takes out compressed air in the point midway in compression at a compression space S to a releasing recess 21 or 24 from this compression space S via release holes 26 at need, and furthermore it discharges it to the inside of a closed case 1 from guide passages 27, making it converge on another compressed gas that a compressor part 3 should be inhaled. Thus, optionally each position of these releasing recesses 21, 23 and 22, 24 can be set respectively. In addition, the number and capacity, etc., of these releasing recesses 21 to 24 are providable as well, so that variable width of a release ratio comes to take it very wide in combination with on-off control over the guide passage.

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 space between a fixed scroll and an orbiting scroll.
In particular, the present invention relates to improvements in the release mechanism for reducing 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 port 12 is provided approximately at the center of the upper end plate 6 of the fixed scroll 8, and a discharge muffler 13 is provided on the upper end plate 6.
is installed and fixed. 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 muffler 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 the discharge chamber 13a inside the discharge muffler 13, protrudes from the discharge muffler 13, penetrates the sealed case 1, and passes through the above-mentioned suction chamber 13a. Connects to the middle part of i'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, the release mechanism may include, for example, a release chamber provided adjacent to the discharge muffler 13 or within the discharge chamber 13a, and a release pipe passing through the upper end plate 6 via this release chamber and the discharge chamber 13a. There are some things.

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

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. 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. It is then discharged from the discharge port 12 into the discharge chamber 13a in the discharge muffler 13, where it is muffled and 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 a reduction in 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 guided from the compression chamber S into the sealed case 1, and returned to the suction side of the compressor, after which a normal compression stroke is performed. In this way, by bypassing a portion 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.

(Problems to be Solved by the Invention) However, in the conventional release mechanism of this type of scroll compressor, the release rate is substantially fixed, and it is difficult to ensure an optimal release rate that adapts to the operating conditions.

Recently, the electric motor section 4 of the compressor is often of the so-called inverter type, in which the operating frequency can be controlled, and is designed to obtain the necessary performance in relation to the release rate. However, when the release rate is approximately fixed, the motor section must be designed so as to obtain a wide range of operating frequencies that cover it.

Moreover, the release pipe 16 is configured to pass through the inside of the discharge chamber 13a, with an opening at one end passing through the upper end plate 6 of the fixed scroll 8 and a midway part passing through the discharge muffler 13 and the sealed case 1. , the release tube 16 is 2
The two components will be connected. Therefore, there are problems such as an increase in the number of man-hours required for machining parts in this area and poor assembly performance.

The present invention has been made in view of the above-mentioned circumstances, and aims to improve release efficiency by maintaining a wide variable range of release rate, facilitates design of the electric motor part, and improves parts processing and assembly. The aim is to provide a scroll compressor that can be used to

[Structure of the invention]

(Means for Solving the Problems) That is, in the present invention, in order to lower the compression capacity as necessary, a release mechanism is provided which temporarily takes out the compressed gas in the middle of compression from the compression chamber and guides it to the suction side.
The release mechanism includes a release recess provided in a mirror plate surface constituting a fixed scroll, an opening surface of the release recess closed with a partition plate, and a release hole communicating the release recess and the compression chamber. The scroll compressor is characterized in that the release recess and the suction side communicate with each other through a guide path.

(Function) With this configuration, an arbitrary number of release chambers can be provided, and in combination with control, the release rate can be varied over a wide range. Moreover, the release mechanism can be processed and assembled without penetrating multiple parts.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Except for the release mechanism 20, which will be described later, other components of the scroll compressor will first be explained with reference to FIG. 4. Since it may be exactly the same as that described above, the same figure will be applied and new explanation will be omitted. The release mechanism 20 is provided on the upper end plate 6 of the fixed scroll 8. Furthermore, to explain,
A plurality of release recesses 21 to 24 are provided on the upper surface side of the upper mirror plate 6. The release recesses 21 and 23 and the release recesses 22 and 24 have different distances from the center O, are symmetrical to each other, and are aligned to have the same opening area and depth.

The upper opening surfaces of these release recesses 21 to 24 are all closed by a partition plate 25. The partition plate 25 is a thin plate having the same shape and area as the upper mirror plate 6, and an opening 25a communicating with the discharge port 12 is provided in the center thereof. Furthermore, the discharge muffler 13 is attached and fixed to the upper part of the partition plate 25. In other words, the partition plate 25 is the upper mirror plate 6
and the discharge muffler 13.

On the other hand, a release hole 26 consisting of a small hole is bored across the bottom surface of each of the release recesses 21 to 24 and the surface of the upper mirror plate 6 on the wrap 7 side. That is, the compression chamber S formed between the laps 7 and 10 of the fixed scroll 8 and the orbiting scroll 11 communicates with each of the release recesses 21 to 24 through the release holes 26 .

Furthermore, guide paths 27 are provided in each of the release recesses 21 to 24. These guide paths 27...
- consists of a plurality of pores that penetrate the outer circumferential side of each of the release recesses 21 to 24 and the circumferential surface of the upper mirror plate 6, and are bored radially with respect to the center point O. The open ends of these pores or the release holes 26 of the release recesses 21 to 24
An opening/closing mechanism (not shown) is provided at the connection part with..., and can be opened and closed as necessary.

Thus, the release mechanism 20 functions exactly the same as the conventional one. That is, if necessary, the compressed gas that is being compressed in the compression chamber S is taken out from the compression chamber S through the release holes 26 . The compressor unit 3 discharges the compressed gas into the compressor unit 3 and combines it with the compressed gas to be sucked in by the compressor section 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.

Furthermore, the fact that the release recesses 21, 23 and the release recesses 22, 24 are at different distances from the center point O also means that they communicate with parts of the compression chamber S having different compression ratios. The position can be set arbitrarily. Further, the number and capacity of the release recesses 21 to 24 can be arbitrarily provided, and in combination with the opening/closing control for the guide path 27, the release rate can be varied within an extremely wide range. As a result, even if the electric motor section 4 is controlled by a so-called inverter, the variable range of the release rate is large, so the variable range of the operating frequency of the motor section 4 is narrow, and the design becomes easy. All such release mechanisms 20 can be provided on the upper end plate 6 of the fixed scroll 8, and can be assembled and processed without penetrating a plurality of parts.

〔Effect of the invention〕

As explained above, according to the present invention, the position, number, and capacity of the release recesses can be arbitrarily set, and in combination with opening/closing control, the release rate can be varied over an extremely wide range. Therefore, even in the case of an inverter-type electric motor section that performs operation frequency control, since the release rate variable range is large, the range of capacity variation depending on the operation frequency can be reduced, and the design of the electric motor section becomes easier. Furthermore, such a release mechanism can be provided entirely on the fixed scroll, and there is no need to straddle a plurality of parts, which improves processing and assembly efficiency and contributes to cost reduction.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a longitudinal sectional view of the main part of a scroll compressor, Figure 2 is a plan view of the fixed scroll, and Figure 3 is a compressor section. FIG. 2 is a vertical cross-sectional view of the main part of the main part, and only the fixed scroll is shown along line 2--2 in FIG. 2. FIG. 4 is a vertical cross-sectional view of the main part of a scroll compressor showing a conventional example of the present invention. S... Compression chamber, 20... Release mechanism, 8... Fixed scroll, 6... (upper part of fixed scroll) f
i-plate, 21 to 24...recess for release, 25...
- Partition plate, 26... release hole, 27... guide path. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a device equipped with a release mechanism that temporarily takes out the compressed gas in the middle of compression from the compression chamber and guides it to the suction side in order to lower the compression capacity as necessary, the release mechanism is provided on the mirror plate surface that constitutes the fixed scroll. a release recess; a partition plate that closes the opening surface of the release recess;
A scroll compressor comprising: a release hole that communicates the release recess and the compression chamber; and a guide path that communicates the release recess and the suction side.