JPS63239392A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enable the reduction in power required for compressing a reexpansion fluid by providing a discharge valve mechanism in the discharge- port-communicating part so as to reduce the discharge port volume. CONSTITUTION:In the base plate 1a of a fixed scroll 1 in which a compression chamber 3 is formed by being combined with an oscillating scroll, a discharge port 4 through which the operating fluid from the compression chamber 3 is discharged is provided. And, a through hole 20 one end of which is communicated with the discharge port 4, and the other end of which is opened to the wall part of the base plate is provided. Further, a discharge valve 21 mechanism is provided in the discharge-port-communicating part on the inside of the through hole 20. Thus, since the volume of the discharge port can be reduced without significantly decreasing the strength of the base plate 1a, the reduction in the power efficiency due to the reexpansion fiuid can be prevented. Furthermore, since it is so constituted that the surface on the opposite side of the compression chamber of the fixed scroll base plate 1a is not subjected to a high pressure, the deformation or the like of the fixed scroll base plate 1a can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor suitable for use in compressing refrigerant or air in refrigeration equipment, air conditioning equipment, etc.

[Conventional technology]

BACKGROUND OF THE INVENTION Conventionally, scroll compressors of this type have a configuration shown in, for example, Japanese Unexamined Patent Publication No. 55-35151. To explain this in the cylinder using FIG. 5, the reference numeral 1 in the figure is a fixed scroll, 2 is an oscillating scroll that forms a scroll-shaped compression chamber 3 when combined with this, and each of these scrolls 1.2 is the scroll base plate 1a.

2a and scroll-shaped spiral protrusions 1b and 2b protruding from the opposing inner surfaces thereof. 4 is a discharge port bored in the center of the fixed scroll base plate 1a, 5 is a discharge valve attached to the outside of the base plate 1a with a hole 4a so as to open and close this discharge port, and 6 is a discharge side. 7 is a discharge pipe for discharging the working fluid outside the compressor, 8 is a feed pipe for introducing the working fluid into the compressor, and 9 is a discharge pipe for introducing the working fluid into the compressor. The working fluid is sucked into the compression chamber 3 from the low pressure chamber 9 and is compressed.

10 is a crankshaft for driving the swinging scroll 2;
11 is a V-belt wheel for transmitting rotational force to the crankshaft IO, 12 is a bearing support for rotatably supporting the crank vehicle 10, and 13 is a rotation prevention mechanism for the oscillating scroll 2.

In such a configuration, driving force is transmitted from the outside to the belt pulley 11 to rotate the crank vehicle 10,
When the rotational force is transmitted to the swinging scroll 2, the swinging scroll 2 moves while maintaining a constant angular posture with respect to the bearing support 12 by the rotation prevention mechanism 13, which is what is called slow swinging. Figure 6 (a), (b)
, (c) and (d). That is, the two spiral protrusions 1b, 2b of the fixed and oscillating scrolls 1, 2 are combined with different angles, and there is a limited space between the two spiral protrusions 1b, 2b extending from the mutual contact part of the spiral protrusions to the mutual contact part. They are arranged in parallel with each other so as to form a compression chamber 3, and one spiral projection 2b is aligned with the other spiral projection 1b so that the base circle center 0' of one spiral projection 2b is the base of the other spiral projection 1b. If we move the spiral protrusion 2b so that it revolves around the circle center 0 with a radius O-0', while inhibiting its rotation, we get
The compression chamber 3 moves toward the center while gradually decreasing its volume. That is, from the state of FIG. 6(a), the spiral protrusion 2b
As shown in the same figure (b) where the revolution angle of The volume of the compression chamber 3 formed by the radial outer periphery of the projection gradually decreases as it moves toward the center.

In Figure (a) rotated 360'', the compression chambers on both sides are connected to the center intermittently, and as shown in Figures P4 (b), (c), and (d), which are further moved by 80 degrees. The compression chamber 3 is caught between the two, and becomes almost zero in (d) of the same figure.Furthermore, at this time, the outer compression chamber 3, which started opening in (b) of the same figure, changes from (c), (d) to (a) of the same figure. ) In the process of moving to the next step, a new oi body is taken in to form a compression chamber.

Therefore, sealed disk-shaped base plates 1a, 2at are provided at both ends of the spiral protrusions 1b, 2b in the fdI line direction, and a discharge port is provided in the center of one of the plywood boards (la) as shown by 4 in FIG. If provided, the fluid taken in at the radial outer circumference would be compressed and discharged from the discharge port 4.

[Problem that the invention seeks to solve]

By the way, in the conventional scroll pressure machine having the discharge port 4 bored in the center of the base plate 1a based on the above-mentioned operating principle, there are problems such as a decrease in power efficiency due to the following reasons. It was something. That is, the compression operation by the scroll compressor described above is shown in FIG.
jS7 and Figure 8, Figure 6 (
As the volume of the compression chamber 3a shown in a) gradually decreases due to the orbital movement of the spiral protrusion 2b, the pressure of the fluid hermetically compressed in the compression chamber 3a gradually increases, and the discharge valve 5 closes the compression chamber. 3a, the discharge valve 5 opens as shown in FIGS. 5 and 8, and the compressed fluid in the compression chamber 3a passes through the discharge port 4. Is it on the hyperbaric chamber 6 side? ! ltj. Furthermore, after that, the spiral protrusion? b sequentially revolves around the spiral protrusion 2b
The compression chamber 3a communicates with the IE compression chamber 3 at the time when the outer wall end face of the base plate 1a passes the end of the discharge port 4 of the base plate 1a, and further the spiral protrusion 2b
By interlocking the revolution, nF output rJ4 and compression chamber 3a
is communicated. When such a state occurs, the high-pressure compressed fluid remaining in the discharge port 4 expands again in the compression chamber 3a, which has increased in volume, and the fluid pressure in the discharge port 4 increases to the inside of the high-pressure chamber 6. , the discharge valve 5 closes, and the high-pressure body is thereby delivered to the high-pressure chamber 6014 by sequentially opening and closing the discharge valve 5.

However, in a scroll compressor that performs such a compression action, when the above-mentioned discharge valve 5 is closed, the required volume, that is, the re-expansion volume, is generated in the portion of the discharge port 4 that selectively communicates with the compression chamber 3a. If there is, the fluid pressure in the compression chamber 3a at the time when this volume portion communicates with the compression chamber 3a will be higher than the fluid pressure in the compression chamber 3a just before communication because the high-pressure compressed fluid remaining in the discharge port 4 will expand again. The pressure rises rapidly, and the power required to compress the fluid sealed inside by causing the vortex to revolve around the protrusion 2b and gradually reducing the volume of the compression chamber 3a exceeds this pressure! It was only one minute larger. In other words, since the high-pressure compressed fluid with the discharged volume is re-expanded, the power required for compression increases by this pressure increase, resulting in a problem that the power efficiency of the compressor deteriorates. It was something that would end up happening.

The present invention was made in view of the above-mentioned circumstances, and aims to reduce the volume of the discharge port, reduce the power required to compress the re-expansion fluid, and obtain scroll compression R with high power efficiency. .

[Means to solve the problem]

In order to meet such demands, the scroll compressor according to the present invention is provided with a discharge port through which working fluid is discharged from the compression chamber in the plywood of the fixed scroll that forms a compression chamber when combined with the oscillating scroll. In addition, a through hole is provided, one end of which communicates with the discharge port and the other end opens into the side wall of the base plate, and a discharge valve mechanism is provided in the discharge port communication portion inside the through hole.

[Effect]

According to the present invention, by incorporating the discharge valve mechanism into the fixed scroll base plate, the volume of the discharge port can be reduced without significantly reducing the strength of the plywood, which reduces power efficiency due to re-expansion fluid. Furthermore, since the surface of the fixed scroll base plate on the side opposite to the compression chamber is configured so as not to receive high pressure, deformation of the fixed scroll base plate can also be prevented. be.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

Figures 1 to 3 show an embodiment of a scroll compressor according to the present invention, and in these figures, parts that are the same as or corresponding to those in Figure 5 and below described above are given the same numbers and explained. is omitted.

Now, according to the present invention, a discharge port 4 through which working fluid is discharged from the compression chamber 3 to the base plate 1a of the fixed scroll 1 which forms the compression chamber 3 by being combined with the oscillating scroll 2
and a through hole 20 that communicates with the discharge port 4 at one end and opens at the side wall of the base plate 1a at the other end,
The present invention is characterized in that a thin cylindrical discharge valve 21 is provided as a discharge valve mechanism in the discharge opening communication portion inside the *a hole 20. Note that 21a in Fig. 1 is a valve body formed by a U-shaped cut in the thin-walled cylindrical discharge valve 21, and this is opened and closed by fluid pressure on the discharge 14 side to discharge high-pressure compressed fluid. 22 is a C type for loading and weiring the discharge valve 21 into the discharge port communication portion of the through hole 20! It is a tome ring.

According to such a configuration, the volume of the discharge port 4 portion, which has been a problem in the past, can be reduced without significantly reducing the strength of the fixed scroll base plate 1a.
This can prevent the conventional problem of reduced power efficiency due to re-expansion fluid. Furthermore, L
According to the above-mentioned configuration, since the surface of the fixed scroll base plate 1a on the side opposite to the compression chamber is configured not to receive high pressure, deformation of the fixed scroll base plate 1a can also be prevented. It is something.

Note that the present invention is not limited to the structure of the embodiment described in F, and the shape, structure, etc. of each part of the scroll compressor may be modified and changed as appropriate. For example, in the embodiment described above, the discharge valve 21 was shown having a thin cylindrical shape with slots, but as shown in FIGS.
It is also possible to have a structure in which one end of the bent portion is bent in the inner diameter direction to integrally form a regulating piece 21b that regulates the opening temperature of the discharge valve body 21a. It is something that can be considered.

Furthermore, the scroll compressor to which the present invention described above is applied is not limited to the type illustrated in FIG. 5, but can be effectively applied to various types of scroll compressors.

〔Effect of the invention〕

As explained above, according to the scroll pressurizer according to the present invention, the plywood of the fixed scroll that forms the compression chamber when combined with the oscillating scroll has a discharge port through which the working wave body is discharged from the compression chamber. At the same time, a through hole is provided with one end communicating with the discharge port and the other end opening into the side wall of the base plate, and a discharge valve mechanism is built into the discharge port communication portion inside this through hole, resulting in a simple configuration. in spite of,
It is possible to reduce the volume of the discharge port without significantly reducing the strength of the fixed scroll base plate, thereby reducing the fluid compression power caused by the tension volume of the discharge port compared to the conventional method and increasing power efficiency. Furthermore, since the surface of the fixed scroll base plate on the side opposite to the compression chamber can be constructed so that it cannot receive high pressure, various problems such as seizure caused by deformation of the fixed scroll base plate can be prevented. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a scroll compressor according to the present invention, FIG. 2 is a cross-sectional view taken along the line II-■, FIG. 3 is a schematic perspective view of the discharge valve, a) and (b) are a front view and a top view of a discharge valve showing a modification thereof, FIG. 5 is a schematic sectional view illustrating a conventional scroll compressor, and FIGS. 6 (a), (b), (c) ) and (d) are diagrams for explaining the compression principle, and FIGS. 7 and 8 are a schematic perspective view and a sectional view of essential parts showing a conventional discharge port and discharge valve mechanism. l... fixed scroll, la... fixed scroll base plate, tb... spiral protrusion, 2... swinging scroll, 2a... a moving scroll base plate, 2b...・
Spiral projection, 3.3a...Compression chamber, 4...Discharge port, 5...Discharge valve, 6...Discharge side high pressure chamber, 7...
...Discharge pipe, 8...Suction pipe, 9...Suction side low pressure chamber, 10...Crankshaft, 20...Through hole, 2
1... Thin cylindrical discharge valve, 21a... Valve body.

Claims (1)

[Claims] A discharge device includes a fixed scroll and an oscillating scroll that form a compression chamber by eccentrically combining spiral protrusions protruding from each base plate, and discharges working fluid from the compression chamber to the fixed scroll base plate. In addition to providing an outlet, a through hole is provided with one end communicating with the outlet and the other end opening into the side wall of the base plate, and a discharge valve mechanism is provided in the outlet communicating part inside the through hole. Scroll compressor.