JPH0842466A - Motor-driven compressor - Google Patents

Abstract

PURPOSE:To obtain a highly efficient and durable motor-driven compressor which prevents the distortion of a scroll blade parts machined with high precision, as the distortion is in danger of occurrence at the time of assembling. CONSTITUTION:In a hermetic vessel 1, a compressing mechanism 4 and an electric motor having both a stator 2 and a rotor 3 are arranged, while the stator 2 is fixed within the hermetic vessel 1. The compressing mechanism 4 is constituted of a fixed scroll blade part 10 having a fixed scroll impeller 9 and a swirling scroll blade part 11. In the vessel 1, a fixed impeller frame body 40 is installed, and the fixed scroll blade part 10 is installed in the fixed impeller frame body 40. In addition, the periphery of the fixed blade frame body 40 is fixed to the hermetic vessel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric compressors such as compressors for refrigerators and gas compressors.

[0002]

2. Description of the Related Art As a first conventional example of an electric compressor having a scroll type compression mechanism in which swirling spiral blades are combined,
For example, US Pat. No. 452516 and US Pat. No. 4527.
No. 33 is mentioned.

In this conventional example, a mechanism portion is arranged above the inside of a closed container, an electric motor is arranged below it, a lubricating oil reservoir is provided at the bottom of the closed container, and the pressure on the suction side is inside the closed container. Has a so-called low-voltage type configuration.

An electric motor is attached to the frame, and the frame is attached to the closed container.

Contrary to the case of the first conventional example, a so-called high pressure type electric compressor in which compressed gas on the discharge side of high temperature and high pressure acts on the electric motor and the lubricating oil sump is taken as the second conventional example. Is shown in FIG.

A compression mechanism 1 is provided above the inside of the closed container 101.
02 is arranged, and the bearing frame body 10a of the compression mechanism 102
The stator 104 of the electric motor is fixed to, and the compression mechanism 102 is press-fitted into the hermetically sealed container 102 at the outer periphery 105 of the bearing frame 103 to be fixed.

At the bottom of the closed container 101, the compression mechanism 102
A lubricating oil sump 106 for accumulating the lubricating oil to be supplied to is provided.

The refrigerant is compressed from the suction pipe 107 through the suction chamber 106 of the compression mechanism 102 in the compression chamber 100 and then discharged from the discharge port 110.

Lubricating oil in the lubricating oil sump 106 is supplied to each portion via the crankshaft 111.

The discharged high-pressure refrigerant is discharged from the discharge port 110 through the compression mechanism outer passage 112 and around the compression mechanism 102 to the outside of the compressor from the discharge pipe 113 of the compressor.

[0011]

As described above, in the above-mentioned high-pressure scroll type compressor, high-temperature and high-pressure discharge refrigerant is discharged from the outer periphery of the compression mechanism, the lubricating oil sump, the electric motor, and the inside of the closed container. In order to pass, the temperature of the suction chamber and the compression chamber inside the compression mechanism is high, and the suction refrigerant gas is violently heated to reduce the efficiency of the compressor. Further, the closed container is required to have high pressure resistance, and the insulating material for the electric motor is also required to have high durability.

From the above, when the low pressure type is selected as the scroll type electric compressor, in the conventional technique, the outer diameter of the electric compressor is ensured while ensuring the space between the stator and the rotor of the electric motor. Also, by eliminating the frame part for fixing the motor, which is an important factor of weight and cost, and fixing the stator directly to the closed container, it is prevented that the refrigerant gas is heated in the compression mechanism and the efficiency is greatly reduced. It has been difficult to realize such things as being inexpensive and easy to manufacture.

Further, if it is attempted to fix the compression mechanism component to the closed container by means such as direct welding, distortion will occur in the highly accurately machined spiral blade component, leading to a reduction in compression efficiency and damage to the spiral blade component. Had challenges.

Cast iron is used as the material for the fixed spiral vane parts, the swirling spiral vane parts, the bearing parts, etc., with an emphasis on workability, but this cast iron has high strength and is difficult to weld to ensure reliable sealing. Met.

[0015]

In order to solve the above problems, the present invention provides a hermetic container with a compression mechanism and an electric motor having a stator and a rotor, and the stator is provided in the hermetic container. While fixing, the compression mechanism is composed of a fixed spiral blade component having a fixed spiral blade and a swirl spiral blade component, a fixed blade frame body is provided, and the fixed spiral blade component is attached to the fixed blade frame body, Moreover, the periphery of the fixed blade frame is fixed to the closed container.

[0016]

The present invention enables the following by the above means.

Since the fixed spiral blade part is attached to the fixed blade frame body and the fixed blade frame body is fixed to the closed container, the welding stress and the press-fitting stress at the time of fixing do not reach the fixed spiral blade part.
No distortion occurs in the fixed spiral blade component processed with high accuracy.

Further, the fixed spiral blade component and the fixed blade frame body can be constituted by separate members, and a steel material which can be easily welded can be selected as the fixed blade frame body.

Further, by arranging the stator of the electric motor and the fixed blade frame body in the closed container, a gap between the inner diameter of the stator and the outer diameter of the crankshaft and the rotor connected to the fixed blade frame body. Can be easily secured.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.

An electric motor stator 2 is provided inside the lower closed container 1.
And a rotor 3 are arranged, a scroll type compression mechanism 4 is arranged above the electric motor, and a crankshaft 5 of a drive shaft thereof is connected to the rotor 3
Bind to.

The refrigerant enters the lower closed container 1 through the suction pipe 6 and is sucked into the compression mechanism 4 through the suction rod 7.

Reference numeral 6 is a cast fixed spiral blade component, 9 is the spiral blade, and 10 is its end plate. Reference numeral 11 is a swirling spiral blade component, and 12 and 13 are respective spiral blades and end plates.

The spiral blades 9 and 12 are combined with each other to form a compression chamber 14 which reduces its volume while moving from the outer periphery toward the center to perform a compression action.

The discharge port 15 at the center of the fixed spiral blade part 3
The compressed refrigerant discharged from the discharge chamber 17 of the compression mechanism frame part 16
Is led to the compressor discharge pipe 16.

A thrust bearing 20 fixed to a bearing component 19 bears the force of the pressure of the compression chamber 14 which pushes the swirling spiral blade component 11 against the opposite side of the compression chamber 14.

The bearing part 19 supports the first main shaft 21 and the second main shaft 22 of the crankshaft 5. Inside the first main shaft 21, a consolidating drive bearing 23 is provided so as to be centered from the center of the main shaft, and the convolutive drive bearing is fitted with a revolving drive shaft 24 provided on the end plate 13 of the revolving spiral blade component 11.

On the outer circumference of the thrust bearing 20, there is arranged a rotation restraint component 25 having a structure in which keys are provided on both sides of a circular annular body for restraining the rotation of the convoluted spiral blade component 11.

A lubricating oil sump 26 is provided below the lower airtight container 1, and an oil supply tank 29 of the crankshaft 5 opens into the lubricating oil sump 26.

Lubricating oil entering the oil supply port 29 from the lubricating oil sump 26 is subjected to oil supply pressure by the centrifugal force of rotation in the centrifugal pump case 30, and the oil supply hole 31, the oil supply groove 32, and the through oil hole of the crankshaft 5 are generated. 33 through the oil groove 34 provided in the orbiting drive shaft 23, through the oil groove 35 provided in the thrust bearing 23, through the oil groove provided in the first main shaft 21, and through the lubricating oil discharge port 36 provided in the bearing component 19. Is discharged.

The electric power of the electric motor is supplied through the insulating hermetically sealed terminal 36 provided above the stator 2 of the electric motor of the container body 37 which is the body portion of the lower closed container 1.

In the assembly of this compressor, the stator 2 is inserted from below the container body 37 while avoiding interference with the insulating and sealed terminal 36.

Next, the compression mechanism 4 including the crankshaft 5 press-fitted into the rotor 3 is provided above the lower closed container 1 with a gap gauge (not shown) or the like to form a gap between the rotor 3 and the stator 2. Insert while adjusting.

After that, the fixed blade frame body 40 made of a steel material having good weldability and having the heat radiation ribs 41 is welded and fixed to the lower closed container 1 at the outer periphery 42 thereof.

Finally, the bottom lid 1a of the lower closed container 1 is welded and fixed to the container body 37 from below.

[0036]

As described above, in the electric compressor according to the present invention, the fixed spiral vane component is attached to the fixed vane frame body, and the fixed vane frame body is fixed to the closed container. The press-fitting stress does not reach the fixed spiral blade component, and the fixed spiral blade component processed with high precision is not distorted.

Further, the fixed spiral blade component and the fixed blade frame body can be constituted by separate members, and a steel material which can be easily welded can be selected as the fixed blade frame body.

Further, by arranging the stator of the electric motor and the fixed blade frame body in the closed container, a gap between the inner diameter of the stator and the outer diameter of the crankshaft and the rotor connected to the fixed blade frame body. Can be easily secured.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric compressor showing an embodiment of the present invention.

FIG. 2 is a sectional view of a compressor showing a conventional example.

[Explanation of symbols]

 1 Lower airtight container 2 Stator 3 Rotor 4 Compression mechanism 5 Crankshaft 6 Suction pipe 7 Suction port 9 Fixed spiral blade parts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Karato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A hermetic container having a compression mechanism and an electric motor having a stator and a rotor arranged to fix the stator in the hermetic container, and the compression mechanism having a fixed spiral vane. A vane component, a swirl spiral vane component having swirl spiral vanes that mesh with the fixed spiral vane to form a plurality of compression chambers, a crankshaft that swivels and drives the swirl spiral vane component, and a main shaft of the crankshaft is supported. A fixed blade frame body is provided, which is composed of a bearing component, a rotation restraint component that prevents rotation of the swirl vane component and only swivels, and a thrust bearing that receives an axial biasing force of the swirl spiral vane component. An electric compressor in which the fixed spiral blade component is attached to the fixed blade frame body, and the periphery of the fixed blade frame body is fixed to the hermetic container.