JPH05149268A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To improve workability and reduce the cost by setting height of a blade part partially to an optimum value, providing a chip seal in only a necessary part to improve a seal property, and reducing necessary man-hour. CONSTITUTION:A fixed scroll blade 17 is meshed with a turning scroll blade 18 to perform compressing action by compression space S between these blades, and compressed gas of the compression space is partly guided to a space part in a back surface side of a turning scroll blade end plate part to seal the compression space by pressing the turning scroll blade to a side of the fixed scroll blade. A mutual point end of blade parts 25, 26 of each scroll blade is set to optimum height (h), so that the blade part point end is brought directly into sliding contact with an end plate part bottom surface of the counter part, in a predetermined range L from a winding start end (a), and a chip seal 30 brought into sliding contact with the end plate part bottom surface of the counter part from an end of this range L over to a winding finish end (e) is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used as a compressor constituting a refrigeration cycle of an air conditioner, for example.

[0002]

2. Description of the Related Art For example, a compressor constituting a refrigeration cycle of an air conditioner has extremely low motion noise as compared with an ordinary rotary compressor, and a suction valve, a discharge valve, etc. are unnecessary and the number of parts is small. There is a tendency that scroll compressors, which are small in number and have good compression performance, are frequently used.

In this type of compressor, a fixed scroll blade composed of an end plate portion and a spiral blade portion integrally projecting from the end plate portion in a hermetically sealed case, and the fixed scroll blade are meshed with the fixed scroll blade. An orbiting scroll blade including a spiral blade portion and an end plate portion integrally provided with the blade portion is accommodated.

The orbiting scroll blade is pivotally supported so as to be capable of orbiting, and a compression space surrounded by the end plate portion and the blade portion is formed. Along with the orbiting movement of the orbiting scroll blade, a refrigerant gas, which is a gas to be compressed, is sucked from the outside of the compression space, the compression space moves toward the central portion, and the space volume is reduced, whereby the refrigerant gas is compressed. When the compression space moves to the center, the space volume becomes the smallest, and the refrigerant gas is compressed to a predetermined pressure and discharged to the outside of the compression space.

Note that, due to such a compression action, the end plate portion of the orbiting scroll blade receives a load in the thrust direction, and the back side thereof is in strong sliding contact with the bearing member or the like. Therefore, the tip of the orbiting scroll blade and the bottom surface of the end plate portion tend to move in a direction away from the bottom surface and the tip of the end portion of the fixed scroll blade.

If they are separated as they are, the compressed gas in the middle of compression leaks from these gaps, so it is necessary to seal the orbiting scroll blade and the fixed scroll blade by some means.

Therefore, generally used is, for example, an intermediate pressure applying means for applying a pressure higher than the suction pressure on the rear side of the orbiting scroll end plate portion. This is formed by penetrating through the pores in the end plate portion of the orbiting scroll blade, and a part of the compressed gas being compressed in the compression space is formed on the back side of the orbiting scroll blade end plate portion through the pores. Lead to the space.

An intermediate pressure is generated on the rear side of the orbiting scroll blade end plate portion, and a pressure difference with respect to the compression space is generated, and the orbiting scroll blade is pressed against the fixed scroll blade side. Therefore, the tips of the scroll blades of the scroll blades are always in sliding contact with the bottom surface of the end plate of the other scroll to form a compression space seal.

[0009]

FIG. 4 shows a specific conventional example.

In the figure, 1 is a fixed scroll blade, and 2 is an orbiting scroll blade. Scroll wings 1 and 2, respectively
Is composed of spiral blades 3 and 4 and end plates 5 and 6 integrated with the blades 3 and 4.

A discharge port 7 is provided substantially in the center of the end plate portion 5 of the fixed scroll vane 1, and the central portion of the compression space S formed by meshing the respective vane portions 3 and 4 is the highest pressure portion. Communicate. In addition, the end plate portion 6 of the orbiting scroll blade 2 is formed with a small hole 8 penetrating therethrough, and the compression space S is formed.
And the closed space portion 9 formed on the back side of the orbiting scroll blade end plate portion 6 communicate with each other.

Therefore, a part of the compressed gas compressed in the compression space S is introduced into the closed space 9 on the rear side of the orbiting scroll blade end plate 6 through the pores 8 and the pressure difference from the compression space S is reached. The orbiting scroll wing 2 is lifted from the wing part 3,
4 A seal is provided between the tip and the bottom surface of the end plate 6 or 5 of the other party.

In such a scroll compressor, the gas to be compressed which is compressed in the compression space S has a high pressure and a high temperature. However, when the pressure temperature rises, all compression spaces S
It is not uniform over the entire length of the compression space S, and the central portion of the compression space S in which the discharge port 7 is provided has the highest pressure and temperature, and the degree decreases toward the peripheral portion.

Each of the scroll wings 1 and 2 is made of a metal material,
In particular, the wings 3, 4 themselves are not so thick. Therefore, the blade portions 3 and 4 are easily affected by heat, and the winding start end side forming the central portion of the compression space S is particularly heated, and is likely to be greatly expanded by thermal expansion.

As a result, as shown in an extreme state in the figure, the scroll wing blades 3, 4 undergo thermal expansion deformation at the winding start end side, which is the central portion of the compression space S, more than at other portions. Here, the bottom surfaces of the end plates 6 and 5 of the other party are surely brought into sliding contact with each other, and a partial sealing property can be obtained.

However, the amount of thermal expansion deformation is small up to the end of the winding, excluding the winding start end side of the blades 3 and 4, and a narrow gap may occur between the bottom surface of the counterpart end plate 6 and 5. Therefore, the gas leaks from the compression space S as described above.

Therefore, this scroll compressor is
For example, before being incorporated in the refrigeration cycle apparatus, the operation is continued for a long time, and the blades 3 and 4 are forcibly worn until the winding start ends become the same as the other portions. Alternatively, the wings 3, 4
The height dimension of the winding start end is processed so as to be lower than the other portions in advance, and is set to be the same in the state of being thermally expanded and deformed.

If such a means is adopted, it is troublesome, the workability is poor, the cost is adversely affected, and it is merely a primary measure. If the compression ratio or temperature condition of the compressor changes, the blade portion changes. There is a problem in that the difference in the thermal expansion changes occurs and the sealing property with respect to the compression space deteriorates.

On the other hand, depending on the scroll type compressor, instead of the means for applying an intermediate pressure to the rear side of the orbiting scroll blade end plate portion, a tip seal is provided along the tip of each blade portion, and the tip seal end surface is opposed to the tip seal. There is also a configuration in which the bottom surface of the end plate of No. 1 is brought into contact with the bottom surface of the end plate for sealing.

In this case, an elastic body such as a spring is interposed between the bottom of the seal groove and the tip seal to elastically press the tip seal to ensure the sealing regardless of the thermal expansion deformation of the blade. it can. However, it is necessary to provide a seal groove for engaging the tip seal over the entire length of the tip of the wing portion, which is extremely troublesome and adversely affects the cost.

Therefore, if an effective combination of the intermediate pressure applying means and the tip seal can be achieved, it is possible to achieve a highly accurate seal and improve the compression performance of the compressor while reducing the processing labor.

The present invention has been made in view of the above circumstances, and an object thereof is to partially set the height of the blade portion to an optimum value and provide a tip seal only in a necessary portion. Thus, it is intended to provide a scroll-type compressor that improves the sealing property and reduces the necessary processing labor, thereby improving the workability and reducing the cost.

[0023]

SUMMARY OF THE INVENTION In order to satisfy the above object, the present invention makes a spiral scroll blade portion of a fixed scroll blade mesh with a spiral scroll blade portion of an orbiting scroll blade, and these scroll blade portions and respective scrolls. A compressed space is formed with the end plate portion of the blade, and the compressed gas is sucked into the compressed space along with the orbiting motion of the orbiting scroll blade and is compressed and discharged. In a scroll compressor that acts as a seal in the compression space by applying a pressure higher than the suction pressure and pressing the orbiting scroll blades toward the fixed scroll blades due to the pressure difference between each other, the tips of the fixed scroll blades and the blade portions of the orbiting scroll blades are For the predetermined range from the winding start end, set the height of the blade so that the tip of the blade is in direct sliding contact with the bottom surface of the end plate of the other side, and from the end of this range to the winding end of the blade, A scroll type compressor, characterized in that a square of the end plate sliding contact tip seal on the bottom.

[0024]

[Function] The central area of the compression space is hotter than the peripheral area, and the thermal expansion deformation of the blade is large. Here, the tip of the blade directly slides on the bottom surface of the end plate of the opponent to seal and slide. A large area is used to reduce the surface pressure.

In the peripheral portion, the tip seal provided at the tip of the wing portion slides into contact with the bottom face of the end plate of the other party to ensure reliable sealing.
It is not necessary to provide the length of the groove for engaging the chip seal over the entire length, and the groove processing length is shortened.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, reference numeral 10 in the drawing is a closed case, and a support frame 11 is provided in an upper part of the closed case 10.
Is provided to rotatably support the rotary shaft 12. A scroll compression mechanism portion 13 described later is provided on the upper portion of the rotary shaft 12, and an electric motor portion 16 including a stator 14 and a rotor 15 is provided on the lower portion.

The scroll compression mechanism portion 13 is a fixed scroll blade 1 mounted and fixed to the support frame 11.
7 and an orbiting scroll blade 18 pivotally supported by the eccentric portion 12a at the upper end of the rotating shaft 12, and an Oldham mechanism 19 for restricting the rotation of the orbiting scroll blade 18 and performing only the orbiting motion.

A concave portion is provided around the rotary shaft 12 of the support frame 11 for supporting the orbiting scroll blade 18,
An intermediate pressure chamber R, which will be described later, is formed so as to be surrounded by the orbiting scroll blade 18 rear surface side.

A suction pipe 20 which communicates with an evaporator (not shown) penetrates through the side of the closed case 1. The open end of the suction pipe 20 penetrates through the side of the fixed scroll vane 17 and swivels with the fixed scroll vane 17. It faces the outer peripheral side of the compression chamber S surrounded by the scroll blades 18.

A discharge port 21 is provided at the center of the fixed scroll blade 17 and opens in the upper portion of the closed case 10. The fixed scroll blade 17 and the support frame 1
The fitting surface of the closed case 10 of FIG. 1 is provided with a high-pressure communication path 22 penetrating the upper and lower end surfaces thereof.
0 and the discharge pipe 23 provided on the peripheral wall of the closed case 10 communicate with each other. The discharge pipe 23 communicates with a condenser (not shown).

As shown in FIG. 1, both the fixed scroll vane 17 and the orbiting scroll vane 18 have an end plate portion 2
4, 25 and spiral wing portions 26, 27 integrally provided on the end plate portions 24, 25. Wings 2
6 and 27 are meshed with each other, and these and the end plate portion 2
A compression space S surrounded by 4 and 25 is formed.
In the orbiting scroll blade end plate portion 25, pores 28 are provided so as to penetrate in the vertical direction, and the compression space S and the intermediate pressure chamber R are provided.
Communicate with.

Tip seals 30 and 30 are provided at the tips of the fixed scroll blade 17 and the orbiting scroll blade 18, respectively, at their tips. That is, in the vicinity of the discharge port 21 provided through the center of the end plate portion 24 of the fixed scroll blade 17, as will be described later, the tips of the respective blade portions 26, 27 are in contact with the bottom surfaces of the other end plate portions 25, 24 in a compressed state. The optimum height dimension h for contact is set.

The tips of the wings 26 and 27 are the end plate 2
5, 24 except for the parts that directly contact the bottom surface,
Tip seals 30 and 30 are provided at the tip of 27, and the end faces of the tip seals are brought into sliding contact with the bottom surfaces of the end plates 25 and 24 of the other party.

Although not shown here, the tip seal 3
Seal grooves 31, 31 provided at the tips of the blades 26, 27 for engaging the bottom surfaces of the 0, 30 and the tip seals 30, 30
An elastic body such as a spring is interposed between the bottom surface and
The tip seals 30, 30 are elastically attached to the end plate 24,
The structure may be such that it abuts on the bottom surface of 25.

To explain further, as shown in the figure and FIG. 2, the height dimension h is optimally set within the range L of about 3/4 to 1 turn from the winding start end a of the blade portions 26, 27. , This range L
The tip seal 30 is provided from the end to the end e of the winding.

In the scroll compressor constructed as above, when the electric motor section 16 is energized to drive the scroll compression mechanism section 13, low-pressure refrigerant gas which is the compressed gas is introduced from the suction pipe 20. Then, it is sucked into the outer peripheral side of the compression space S surrounded by the fixed scroll blade 17 and the orbiting scroll blade 18.

The refrigerant gas sucked into the compression space S is
It is compressed as the orbiting scroll blade 18 orbits. When the pressure rises to a predetermined value, it is discharged from the discharge port 21 to the upper part inside the closed case 10, and the high pressure communication passage 2 is further discharged.
2 fills the lower part inside the closed case 10 through. This high-pressure refrigerant gas is guided to the external condenser via the discharge pipe 23. The electric motor section 16 is controlled to an optimum operating frequency according to the load, and air conditioning is performed under optimum conditions.

A part of the refrigerant gas being compressed in the compression space S is introduced into the intermediate pressure chamber R through the pores 28 and fills the intermediate pressure chamber R. Due to the pressure difference between the intermediate pressure chamber R and the compression space S, the rear side of the orbiting scroll blade end plate portion 25 receives pressure and floats up as a whole.

Particularly, the temperature in the vicinity of the discharge port 21 of the compression space S becomes high. Specifically, in the state where the compression space S and the discharge port 21 communicate with each other, the compressed gas that has been compressed and increased to a predetermined pressure is discharged from the discharge port 21. However, not all of the compressed gas in the compression space S is discharged from the discharge port 21 at the same time, and a part of it is about 3/4 to 1 turn from the winding start end a of the blades 26 and 27 (range: (Matches L).

Therefore, the wing portion 2 in this range L
6 and 27 are exposed to extremely high heat and undergo large thermal expansion deformation. However, since the optimum height dimension h is set in consideration of this deformation in advance, the tips of the blades 26 and 27 of each other are the end plates of the partner. 25, 24 evenly contact the bottom surface. Since all the blade tips 26 and 27 are in sliding contact with each other, a sufficient sliding area and a sealing area can be secured, and a reliable seal can be achieved even though the pressure difference is large.

In the peripheral portion where the temperature is lower than that in the central portion and the thermal expansion deformation is small, the tip seals 30 and 30 provided at the tips of the blade portions 26 and 27 are the end plates 25 and 24 of the counterpart.
Sliding on the bottom. Therefore, a smooth orbiting motion of the orbiting scroll blade 18 is promoted, and the compression space S is reliably sealed.

It is not necessary to provide the seal groove 31 for engaging the tip seal 30 over the entire length of the blade portions 26 and 27, and the material can be saved and the labor required for processing can be reduced.

In the above embodiment, the intermediate pressure is applied to the rear side of the orbiting scroll blade end plate portion 25. However, the present invention is not limited to this, and the discharge pressure may be applied directly. The point is that a pressure higher than the suction pressure may be applied.

Further, these pressures are not limited to being uniformly applied to the rear side of the orbiting scroll blade end plate portion 25, and for example, the discharge pressure and the intermediate pressure may be partially and simultaneously applied.

The scroll compressor is not necessarily limited to the one provided in the equipment constituting the refrigeration cycle, and can be used for compressing other kinds of compressed gas or air.

[0047]

As described above, according to the present invention, the tips of the fixed scroll blade and the orbiting scroll blade are located within the predetermined range from the winding start end, and the blade tips are directly on the bottom surface of the other end plate. The height of the wing is set so that it will come into sliding contact with the blade, and the tip seal that slides on the bottom surface of the end plate of the other side from this range end to the end of winding is provided. The value may be set to a value, and the number of necessary points for chip sealing is shortened, and the sealing property is improved, and the workability is improved and the cost is reduced due to the reduction of the required labor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a scroll compressor, showing an embodiment of the present invention.

FIG. 2 is a plan view of a fixed orbiting scroll blade of the embodiment.

FIG. 3 is a vertical cross-sectional view of the scroll compressor of the embodiment, in which a part is omitted.

FIG. 4 is a vertical cross-sectional view of a main part of a scroll compressor of a conventional example.

[Explanation of symbols]

Reference numeral 17 ... Fixed scroll blade, 26 ... (Fixed scroll blade) blade portion, 24 ... (Fixed scroll blade) end plate portion, 18
... orbiting scroll blade, 27 ... (orbiting scroll blade) blade portion, 25 ... (orbiting scroll blade) end plate portion, S ... compression space, R ... intermediate pressure chamber, a ... winding start end, e ... winding end end,
30 ... Tip seal.

Claims (1)

[Claims] 1. A swirling blade portion of a fixed scroll blade and a spiral blade portion of an orbiting scroll blade are meshed with each other, and a compression space is formed by these blade portions and the end plate portion of each scroll blade to make swirling. The compressed gas is sucked into the compressed space along with the orbiting motion of the scroll blade, and is then compressed and discharged. In a scroll compressor that presses the orbiting scroll blade toward the fixed scroll blade side to seal the compression space, the tips of the fixed scroll blade and the orbiting scroll blade are directly connected to each other within a predetermined range from the winding start end. The height of the wing is set so that it slides on the bottom surface of the other end plate, and a tip seal that slides on the bottom surface of the other end plate is provided from this range end to the winding end of the wing. Scroll compressor according to claim.