JPS59201987A - Scroll compressor - Google Patents

Abstract

PURPOSE:To improve the efficiency of compressor by employing a resilient tube as a chip seal then opening the high pressure side while enclosing the low pressure side and feeding high pressure into the tube and effectively sealing the gap at the tip of a spiral body through expansion of resilient body. CONSTITUTION:A tubed chip seal 9 has an open high pressure end 11 and an enclosed low pressure end 12. The entirety is bent spirally and fitted into a chip seal groove 6 formed at the tip of spiral body 5 of fixed scroll 1 and rolling scroll 2. Upon motion of scroll, compressed high pressure gas will enter through the open high pressure end 11 of the tubed chip seal 9 into the hollow section 10 of tube to expand the chip seal 9 thus to seal the gap between both scrolls efficiently. The cross-section of the chip seal 9 is not limited to circle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll compressor, and particularly to a tip seal thereof.

Before entering into the description of the present invention, the basic principle of a scroll compressor will be described.

The basic elements of a scroll compressor are shown in Fig. 1. In Fig. 1, (1) is a fixed scroll; (2) is a fixed scroll;
The moon is an oscillating scroll, (3) is a discharge port, (4) is a compression chamber, 0 is a fixed point on the fixed scroll, and σ is a fixed point on the oscillating scroll. Fixed scrolls (1) 2 and oscillating scrolls (February) are composed of spirals of the same shape, and their shapes are, as is known from the past, involute,
B Rui is a combination of circular arcs, etc.

Next, the operation will be explained. In the first factor, the fixed scroll (1) is stationary with respect to space, and the swinging scroll (2) is combined with the fixed scroll (1) as shown in the figure to change its posture relative to space. Don't show change,
Rotating motion, that is, rocking, is carried out at 0°, 90°, 1 in Fig. 1.
Move like 80°, 270°. Oscillating scroll (
2), a crescent-shaped compression chamber (
4) reduces its volume by jll+1, and the gas taken into the compression chamber (4) is compressed and discharged from the discharge port (3). During this time, the distance of 1st L40~(J is kept constant)
If we express the spacing between the spirals by p and the curve by t, we get -tK, / -t. p corresponds to the pitch of the spiral.

The outline of the device known as a scroll compressor is as above.

In Fig. 2, the tip seal and the oscillating scroll ('
Person A is 21 and (2) is me h + scroll, (5
(6) is a tip seal groove, and (7) is a tip seal. The chip seal (7) has a spiral body (5
) is designed to fit into a tip seal groove (7) provided at the tip of the tip.

When the scroll compressor is operated according to the principle shown in FIG. 1, the pressure in the compression chamber (4) increases upward from the outer circumference toward the inner circumference. In this case, the oscillating scroll (2
) radial leakage occurs across the tip of the spiral body (5) from the high pressure side to the low pressure side. In such cases, compression efficiency is significantly reduced. Particularly, in the case of the conventional technology that does not provide a tip seal, it is difficult to improve the compression efficiency without relying on expensive means such as precision machining.

When using a tip seal (7) as shown in Figure 2, during operation, the tip seal (7) is pressed in the radial direction by high pressure introduced into the tip seal groove as shown in Figure 3. It acts as a seal and prevents leakage.

The backup spring pushes up the tip seal (7) and the high pressure rise is not enough as at startup.
It also performs a V-seal and performs an auxiliary action to apply high pressure to the back of the chip. The sealing force during operation is provided by both the IH2 and the force.

In the conventional example shown in Fig. 3, a back up spring (8) is attached to the back of the tip seal (7).
is necessary, especially to ensure sealing, which increases the number of parts and requires a back-up spring (
8) was also difficult to select, and the 7 base for the back amp spring (8) was required in the tip-knoll groove, which had many disadvantages. However, it has the disadvantage that the secondary sealing effect is not sufficient due to the generation of pressure from high pressure to low pressure through the tip-knoll groove.

This invention was made to eliminate the drawbacks of the conventional products as described above, and uses a tube-shaped elastic body as a chip seal, leaving the high-pressure end open and the low-pressure end sealed. The purpose is to introduce high pressure into the internal space, apply internal pressure, and use the tension of the elastic body to seal the gap at the tip of the spiral body.

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 4, (9) is a tubular tip seal, (
10 is the hollow part of the tubular tip seal (9), 0υ is the high pressure side end, (IW is the low pressure side end, and the high pressure ft1.lI
The end QIJ is left open and the low pressure (11!) end θ is sealed 71.

The tubular tip seal (9) shown in the front view in FIG. 4(A) and marked in the side view in FIG.
I (as shown in C1, spirally bent piece 2'L, spiral body (
5) into the tip seal groove (6) at the tip. This state is shown as a cross-sectional view in FIG.

15, (1) is a fixed scroll, (
2) is an oscillating scroll, (6) is a tip/seal groove, (
9) is a tubular tip seal with a hollow head.

Tubular tip fitted into tip seal groove (6)
As mentioned above, the high pressure side end 0υ of the seal (9) is open, and the low pressure side end (121) is sealed.

@ When compression operation is performed based on the principle shown in Figure 1, g(p, compressor (4) shown in Figure 1
The pressure increases as it goes in from the outside, reaches the discharge pressure at the center, and the compressed fluid is discharged from the discharge port (3).

As shown in Fig. 5, the tubular tip seal (9) is fitted into the tip seal groove and is exposed to the high pressure area as shown in Fig. 4. Tubular tip seal (9)
High pressure gas flows into the hollow part OqV.

At this time, if the land force on the outer periphery of the tubular tip seal (9) is lower than the pressure in the hollow part 0(), the tubular tip seal (9)
In Figure 6, the tubular tip seal (9) is in the tip seal groove (6) at the tip of the winding body (5). For example, if the tube-shaped tip seal expands to nH1 as shown in the same figure,
lil' scroll (set in 2nd position) As a result of expansion, it touches the bottom of the fixed scroll (1),
It will be sealed in the radial direction mn\ from the high pressure side to the low pressure side.

Second, in the above embodiment, the cross-sectional shape of the tubular tip seal (9) was circular, but it may have a rectangular cross-section as shown in Fig. 7 so that it can fit tightly into the groove, depending on the purpose. Other cross-sectional shapes can also be used. Further, the shape of the hollow portion QG is not limited to a circular shape, but it is also possible to use other shapes.

In Figures 6 and 7, (a) is the high pressure side chamber, (b)
is the chamber on the low pressure side. In this embodiment, by opening the high pressure side of the tubular tip seal, high pressure is introduced to inflate the tip seal. ,
When a refrigerant is sealed in a sealed container, the pressure of the refrigerant increases as the temperature rises during operation, so this pressure is used to create a chip.

The seal may be inflated.

Furthermore, there is a small hole that performs a secondary sealing action for the gas leaking from the high pressure side passing through the tip seal groove to the low pressure (1+lj).Also, as in the conventional example, there is a spring etc. to assist the sealing action. Needless to say, it is unnecessary and improves reliability and cost.

As described above, the iL according to the present invention has a hollow part in the chip seal and is shaped like a tube, and the high pressure side is open and the low pressure side is sealed, or the high pressure is introduced into the hollow part. The tip seal is expanded by the internal pressure acting on the hollow portion, and the expanded tip seal seals the radial leakage at the tip of the volute, thereby improving the efficiency of the compressor.

[Brief explanation of drawings]

Figure 1 is a diagram of the operating plate of a scroll compressor, 4〕2L゛4 is a diagram of a chip seal fitted into an oscillating scroll, Figure 3 is a conventional example of a chip seal, and Figure 4 is a diagram of a chip seal of the present invention. One implementation of tubular tip sole 4I/lI NoJ<
-ji'9, Figure 5 shows the tubular tip shown in Figure 4.
On the seal, the 61st 1 is the 41st. 5th ryj
, J (explanatory diagram of the operation of the tubular tip seal;
¥37 C'q is another example of this redundancy, which is a Nisso seal with a rectangular cross section. In Cnj, (1) is ii! +1 fixed scroll, (
2) is an oscillating scroll, (3) is a discharge port, (4) is a compression chamber, (5) is a 1-roll shaft, (6) is a tip/seal groove, (
7) is a tip seal, (8) is a back up spring, (9J is a chewy dog tip seal, O
IJ is hollow, (Iυ is high pressure (1111 end, α2 is low F
A2 side end, A sharp is a rectangular cross section tubular tip seal. k: Fu-・[Rinakamukai-99 is the same or equivalent part. Agent Masuo Oiwa Figure 1 0° Z7θ09θ°
/θθ. Figure 2; Figure 3/ ・↑tXl 5th[4, 1st (51'4 7.2 (

Claims (1)

[Claims] (1) In a chip seal used in a scroll compressor, the chip seal is configured in the shape of a tube with a hollow part, and high pressure is introduced or sealed into the hollow part to seal the chip. A scroll compressor characterized by having a tip seal that expands the seal and seals an axial gap that causes radial leakage in the scroll compressor. (2. A scroll compressor characterized by introducing high pressure into the hollow part by opening the high-pressure side end of the tube-shaped tip seal -1 in the scroll pressure M& described in claim 1. ( 3) The scroll compressor according to claim 1, wherein the tube-shaped tip seal has a circular cross section. (4) The scroll according to claim 1 A scroll compressor is a compressor characterized by a tube-shaped tip/seal having a rectangular cross section.