JPH11159456A - Sealed type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed type compressor improving workability by easily performing a work mounting a cover body covering a sealed terminal on a sealed case which is made to have a pressure tight structure. SOLUTION: This compressor is provided with an electric compressor main body constituted by connecting an electric motor part and a compression mechanism part via a rotary shaft, a sealed case 1 storing this electric compressor main body and forming a spherical surface part 15 whose upper part is an inclined surface, for instance, a sealed terminal 21 which is arranged in the spherical surface part of this sealed case 1 in a sealing state and is electrically connected with the electric motor part 4, a cover body 22 covering this sealed terminal 21 and a fixing tool 18 mounting and fixing this cover body 22 on/to the sealed case 1. The fixing too 18 is constituted of a fixing bolt 25 and a nut 26. The center shaft Lb direction is made parallel to the center shaft La direction of the electric compressor main body and a fixing bolt tip part is fixed to the sealed case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an improvement in a mounting structure of a cover for covering a sealing terminal to a sealing case in a hermetic compressor constituting a refrigeration cycle of an air conditioner.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional hermetic compressor. a
Denotes a sealed case, in which an electric compressor main body e formed by connecting an electric motor part b and a compression mechanism part c via a rotating shaft d is accommodated. A discharge pipe f is connected to the upper surface of the sealed case a, and a sealed terminal (also referred to as a terminal) i is attached to the vicinity of the discharge pipe f in a sealed state.

The sealed terminal i is connected to a sealed case a
Is covered with a cover body (also referred to as a terminal cover) j attached via a fixing member h. The fixing tool h includes a fixing bolt k whose head is fixed to the upper surface of the sealed case a by welding or the like, and a fixing bolt k.
And a nut m that is screwed to a screw portion that penetrates upward through the cover body j and that fastens and fixes the cover body j.

[0004] Pipes (not shown) are arranged around such a hermetic compressor, and a tool for fastening the nut m is inserted through a gap between these pipes, and a fastening operation is performed. It has become.

That is, the upper surface of the compressor forms a horizontal plane perpendicular to the direction of the center axis La of the electric compressor main body e,
The fixing bolt k is erected vertically upward so that the nut receiving portion, which is the upper surface of the cover j, also forms a horizontal plane. When the nut m is tightened, a tool is inserted in the vertical direction, and the piping is arranged in a manner corresponding to this work.

[0006]

By the way, for example, in a refrigeration cycle of an air conditioner, a conventionally used CF has been used.
Instead of C (chlorofluorocarbon) 12 (referred to as R12) refrigerant or HCFC (hydrochlorofluorocarbon) 22 (referred to as R22) refrigerant,
An HFC (hydrofluorocarbon) refrigerant containing no chlorine atom has been newly adopted.

[0007] Among the HFC refrigerants, R410A, which is a mixed refrigerant, is used. This refrigerant is a high-pressure refrigerant whose theoretical refrigerating capacity is larger than the theoretical refrigerating capacity of a conventionally used refrigerant.

For this reason, when a high-pressure refrigerant is used in a refrigeration cycle of an air conditioner, the operating pressure is about 1.5 times higher than that of the conventional R22, and the pressure-resistant design of all the components must be reviewed.

That is, if a high-pressure refrigerant is used with the structure of the compressor, the sealed case a may be deformed by receiving the internal pressure from a high working pressure. However, the stator constituting the electric motor portion b is fitted around the peripheral portion of the sealed case a, and the support frame constituting the compression mechanism portion c is fitted therein. No deformation occurs.

However, only the sealing terminal i and the discharge pipe f are mounted on the upper surface of the same sealed case a, but these members cannot be deformation suppressing members, and the upper surface of the sealed case a receives internal pressure. Easy to deform.

Therefore, a sealed case n as shown in FIG. 7 has been newly designed. This is because the upper surface p is inclined. Specifically, it has a spherical shape and has a rigidity enough to withstand the use of a high-pressure refrigerant.

However, in such a compressor having a spherical upper surface portion p, the sealing terminal i
In particular, the direction of the center axis Lb of the cover j and the fixture h is oblique with respect to the vertical direction, so that the nut tightening tool must be obliquely inserted.

In this state, if the tightening work of the nut m is to be performed, the pipes are in the way and the work cannot be performed. That is, the pipes are arranged on the premise that the tool is inserted in the vertical direction and the nut m is tightened, and the arrangement corresponding to the tightening by inserting the tool diagonally is practically impossible. .

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a closed case having a structure that can withstand the use of high-pressure refrigerant.
An attempt is made to provide a hermetic compressor with improved workability in which the work of attaching a cover body covering a sealed terminal to a hermetic case can be easily performed without changing the layout of the surrounding piping. Things.

[0015]

Means for Solving the Problems In order to satisfy the above-mentioned object, a hermetic compressor according to the present invention is, as a first aspect, an electric compressor body in which an electric motor section and a compression mechanism section are connected via a rotating shaft. A sealed case housing the electric compressor main body, the upper part of which forms an inclined surface, a sealed terminal which is disposed in a sealed state on the upper inclined surface of the sealed case, and is electrically connected to the motor unit, A cover for covering the sealed terminal; and a fixture for fixing the cover to the sealed case. The fixture has an end fixed to the sealed case, and a central shaft fixed to the electric compressor. It is characterized in that it is oriented parallel to the central axis of the main body.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, the upper inclined surface of the closed case has a substantially spherical shape. As claim 3, claim 1
3. The hermetic compressor according to claim 2, wherein a flat portion having a surface perpendicular to a central axis of the electric compressor main body is provided on an upper inclined surface of the hermetic case, and the flat portion is provided. The end of the fixture is fixed to the fixing member.

According to claim 4, claims 1 and 2
In the hermetic compressor according to any one of the above, the end of the fixing device on the sealing case fixed side is formed in the same inclined shape as the upper inclined surface of the sealing case.

[0018] Claim 5 is Claim 1 and Claim 2
In the hermetic compressor according to any one of the above, a hole parallel to the central axis of the electric compressor main body is provided on the upper inclined surface of the hermetic case, and the end of the fixture is hermetically fixed to this hole. It is characterized by.

[0019] Claim 6 is Claim 1 to Claim 5
In the hermetic compressor according to any one of the above, the hermetic terminal has a fixture receiving portion formed on a surface perpendicular to a central axis of the electric compressor main body.

[0020] Claim 7 is Claim 1 to Claim 6
In the hermetic compressor according to any one of the above, the compression mechanism compresses high-pressure refrigerant. By adopting the means for solving the above-described problems, the upper part is inclined as a sealed case of a pressure-resistant structure, and when attaching a cover body covering the sealed terminal to the inclined part of the sealed case via a fixing tool, surrounding piping is installed. The installation work can be easily performed without the kinds of obstacles obstructing the installation tool.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hermetic compressor according to the present invention will be described below with reference to the drawings. This hermetic compressor constitutes, for example, a refrigeration cycle of an air conditioner. The refrigerant used for the refrigeration cycle is assumed to be an HFC refrigerant having a higher condensing pressure and an evaporating pressure than the conventional R22 refrigerant.
410A is used.

The R410A refrigerant is a pseudo-azeotropic refrigerant mixture in which difluoromethane (R32) and pentafluoroethane (R125) are mixed with each other at a ratio of 50% (weight ratio). Because of its high conductivity, it has the optimal characteristics for air conditioners.

However, the R410A refrigerant has a higher condensing pressure and a higher evaporation pressure than the conventionally used R22 refrigerant, and is higher than other HFC mixed refrigerants. Therefore, among the HFC mixed refrigerants, especially the R410A refrigerant is called a high-pressure refrigerant.

In FIG. 1, reference numeral 1 denotes a sealed case described later. Inside the sealed case 1, an electric compressor main body 2 is provided.
Is accommodated. The electric compressor body 2 is configured such that an electric motor unit 4 is provided on an upper side of a rotating shaft 3 oriented in a vertical direction, and a compression mechanism unit 5 is provided on a lower side thereof. In particular, a part of the compression mechanism 5 is immersed in a lubricating oil reservoir 6 formed on the inner bottom of the closed case 1.

The motor section 4 is provided with a stator 7 fixed to the inner wall of the sealed case 1 and a small gap with the inner peripheral surface of the stator, and is fitted to the rotating shaft 3. Rotor 8
Consists of

The compression mechanism section 5 here has two upper and lower cylinder chambers 9a and 9b, and a two-stage rotary type in which eccentric rollers 10a and 10b are eccentrically rotatably accommodated in the respective cylinder chambers 9a and 9b. Form a compression mechanism.

Each of the cylinder chambers 9a, 9 of the compression mechanism 5
Suction pipes 11a and 11b are connected to b, and are connected via a gas-liquid separator 12 to an evaporator (indoor heat exchanger) (not shown) constituting a refrigeration cycle.

Next, the closed case 1 will be described in detail. The closed case 1 includes a case body 13 formed of a cylindrical body whose lower end is a bottom and whose upper end is open, and a lid 14 that closes an upper end opening of the case main body.

The case body 13 and the lid 14 are both
Although the refrigerant used is R410A, which is a high-pressure refrigerant, its plate thickness may be the same as that of the related art. A stator 7 constituting the electric motor section 4 and a support frame 5a constituting the compression mechanism section 5 are fitted to the case body 13, and a cover body 22 covering the discharge pipe 16 and a sealing terminal described later is fitted to the lid body 14. Mounted.

The lid 14 is fitted into the upper opening of the case body 13 and is welded along the fitting edge of the case body. And a closing part 15 for closing the upper end opening of the case body 13.

The closing part 15 is substantially closed case 1
And the refrigerant used for the refrigeration cycle is a high-pressure refrigerant. Specifically, in order to obtain excellent pressure resistance, the sealed case 1
Are formed in a spherical shape having a center point on the center axis of

Therefore, the closing portion 15 is thereafter
This is referred to as a spherical portion 15. The spherical radius of the spherical portion 15 is 50 to 100 times the inner diameter of the case body 13 in order to obtain a large rigidity.
It is good to set in the range of%.

A discharge pipe 16 provided substantially at the center of the spherical portion 15 is loosely inserted into a mounting hole 16a opened in the spherical portion 15 along the axial direction, and is fixed by means such as brazing. You. The lower end is opened at a position above the electric motor section 4, and the other end is connected to a condenser (outdoor heat exchanger) constituting a refrigeration cycle (not shown).

The cover 22 is attached to a predetermined portion of the spherical portion 15 via a fixture 18 as described later. Next, the configuration of the sealed terminal and the means for attaching the cover body 22 to the sealed case 1 by the fixing tool 18 will be described with reference to FIG.

The sealed terminal 21 is composed of a terminal section (also called a terminal) having a plurality of terminals 20 electrically connected to the motor section 4 via lead wires. Then, the sealing terminal 21 is fitted into an opening (not shown) provided in the spherical surface portion 15 and is attached and fixed in a sealed state by a predetermined means.

Accordingly, the sealing terminals 21 are attached along the tangential direction of the spherical portion 15, and each terminal 20 protrudes along the normal direction. For this reason, each terminal 20 is inclined with respect to the central axis La of the electric compressor main body 2 which is the central axis of the sealed case 1.

The cover body 22 is formed in a box shape having an opening only on the lower end surface side, and is formed in a spherical shape so that the periphery of the opening abuts on the spherical surface portion 15. You.

The peripheral portion of the cover 22 extends along the axial direction of the terminal 20, and the upper surface portion facing the opening is mostly a surface perpendicular to the axial direction of the peripheral portion. A nut receiving portion 23 which is a fixture receiving portion on a surface perpendicular to the central axis La of the electric compressor main body 2 is formed only partially.

A hole 24 is provided through the nut receiving portion 23, and a screw portion of a fixing bolt 25 constituting the fixing tool 18 is inserted and protrudes above the cover body 22. A fixing bolt 25 is attached to a screw portion projecting upward from the cover body 22.
At the same time, a nut 26 constituting the fixture 18 is screwed, and the cover body 22 is attached and fixed to the spherical surface portion 15.

The lower end head 25a of the fixing bolt 25 is
It is attached and fixed to the closed case spherical portion 15 by means such as welding. More specifically, a part of the spherical portion 15 is recessed, and the bottom portion has an area large enough to mount the lower end head 25a of the fixing bolt 25 and the electric compressor main body. A flat portion 27 having a surface perpendicular to the center axis La is formed.

From the place where the lower end head 25a of the fixing bolt 25 is fixed to the flat part 27, the fixing bolt 25 constituting the fixing tool 18 and the center axis Lb direction of the nut 26 screwed to this screw part Is parallel to the direction of the center axis La of the electric compressor main body 2.

Thus, the sealed terminal 21 is supplied from an external power source.
When the motor unit 4 is energized via the motor, the rotating shaft 3 is driven to rotate, whereby the eccentric rollers 10a and 10b perform eccentric rotation in the cylinder chambers 9a and 9b. Gas-liquid separator 12
R410A gas, which is an HFC mixed refrigerant, is sucked from the suction pipes 11a and 11b into the respective cylinder chambers 9a and 9b via the suction pipes 11a and 11b.

The eccentric rollers 10a and 10b are
When rolling contact is made with a predetermined portion of the inner peripheral surface of a, 9b, the space capacity of the cylinder chamber becomes maximum. The refrigerant gas is supplied to each suction pipe 11a, 1
1b leads to the cylinder chambers 9a and 9b to be filled.

Then, the eccentric rotation of the eccentric rollers 10a and 10b moves the rolling contact position with the inner peripheral surfaces of the cylinder chambers 9a and 9b, and the volume of the cylinder chamber on the moving side decreases. That is, the gas previously introduced into the cylinder chamber is gradually compressed.

When the rotating shaft 3 is continuously rotated, the capacity of the cylinder chambers 9a and 9b on the moving side further decreases, and when the gas introduced into the cylinder chamber is compressed and rises to a predetermined pressure, high-pressure gas is sealed from the cylinder chamber. It is discharged into the case 1 and filled. Then, it is discharged from the discharge pipe 16 on the upper part of the closed case 1.

While the high-pressure refrigerant R410A is used in the refrigeration cycle, the plate thickness of the closed case 1 is adopted as in the conventional case, but the stator 7 of the motor unit 4 is mounted on the case body 13 constituting the closed case 1. At the same time, the support frame 5a of the compression mechanism 5 is fitted, and the lubricating oil reservoir 6 is formed at the bottom, so that it hardly deforms.

Further, since the fitting portion 14a constituting the lid 14 is connected to the case body 13, it is not so deformed. In addition, the spherical portion 15 of the lid 14 is hardly deformed even when stress is concentrated on the spherical portion 15 because of its shape and structure. No metal breakdown occurs.

In the assembly work of this compressor,
In mounting the cover body 22 covering the sealing terminal 21 on the spherical portion 15 via the fixing member 18 to the sealed case 1, the center axis Lb of the fixing member 18 with respect to the direction of the center axis La of the electric compressor main body 2 which is vertical. Since the directions are parallel, a tool is inserted in the vertical direction to fasten the nut 26 to the screw portion of the fixing bolt 25.

That is, the structure of the sealed case 1 was changed to correspond to the use of the high-pressure refrigerant. However, the piping arranged around the sealed compressor does not need to be changed in the same manner as the conventional one. The cover body 22 can be attached without any trouble by inserting a tool in the vertical direction.

Further, a flat portion 27 having a surface perpendicular to the direction of the center axis La of the electric compressor main body 2 is provided on the spherical portion 15 of the sealed case 1 and the fixing bolt 25 is fixed thereto. Inevitably, the direction of the central axis Lb of the fixture 18 can be arranged in parallel with the direction of the central axis La of the electric compressor main body 2.

Further, a nut receiving portion 23 is provided on the upper surface of the cover body 22 in a plane perpendicular to the direction of the center axis La of the electric compressor main body 2.
Therefore, the fixture 18 parallel to the central axis La direction of the electric compressor main body 2 can be attached.

In the above embodiment, since the high-pressure refrigerant is used, the closing portion 15 of the closed case 1 is formed in a spherical shape so as to form a pressure-resistant structure. However, the present invention is not limited to this.
As shown in FIG.

The discharge pipe 16 which is the upper end face of the sealed case 1A
The connecting portion 15a is formed on a flat surface, and is formed on a tapered inclined surface 15b from here toward the peripheral portion. The sealing terminal 21 is attached to the inclined surface 15b in a sealed state.
A cover body 22 that covers the sealing terminal 21 is attached and fixed to the inclined surface 15b via the fixture 18.

That is, a flat portion 27 having a surface perpendicular to the central axis La direction of the electric compressor main body 2 is provided on the inclined surface 15b, and the lower end head 25a of the fixing bolt 25 is fixed thereto. A nut receiving portion 23 on a part of the upper surface of the cover body 22, the surface being perpendicular to the direction of the center axis La of the electric compressor main body 2.
There is no change in providing.

Even with such a closed case 1A structure, rigidity enough to withstand the use of high-pressure refrigerant is reliably obtained, and a nut fastening tool is inserted vertically to perform fastening work. Even if the piping is routed the same as before, it does not hinder a little.

In the above embodiment, the direction of the center axis Lb of the fixture 18 is set to the center axis La of the electric compressor main body 2.
In order to make it parallel to the direction, a part of the closed case spherical portion 15 is recessed and the bottom surface is a flat portion 27 having a surface perpendicular to the central axis La. However, the present invention is not limited to this. You may.

As shown in FIG. 4, the upper surface of the sealed case 1 is formed in a spherical shape, and a part of the upper surface of the cover 22 is formed in a nut receiving portion 23 on a surface perpendicular to the axial direction of the electric compressor body 2.
Is as described above.

Here, it is not necessary to form the flat portion 27 in the spherical portion 15 as described above. Instead, the lower end head 25a of the fixing bolt 25A constituting the fixing tool 18A
Is formed in a curved shape so as to match the shape of the spherical portion 15, and is engaged with a predetermined position of the spherical portion 15 and then fixed. That is, since the object to be processed is the fixing bolt 25A, it is advantageous in terms of man-hours.

The configuration shown in FIG. 5 may be used. Here also, the upper surface portion 15 of the sealed case 1 is made spherical,
A part of the upper surface of the cover 22 is connected to the central axis L of the electric compressor main body 2.
The nut receiving portion 23 having a surface perpendicular to the direction a is
As described above.

A through hole 28 is provided in the spherical portion 15 of the sealed case 1 in parallel with the direction of the center axis La of the electric compressor main body 2. The diameter of the through-hole 28 is larger than the diameter of the screw portion of the fixing bolt 25B that forms the fixing device 18.

The fixing bolt 25B does not require the lower end head 25a described above, and may have the same diameter as the threaded portion over the entire length. In other words, a threaded portion having a predetermined diameter is formed at an end of a rod having a predetermined diameter.

Then, the lower end w is inserted into the through hole 28 provided in the spherical portion 15, and for example, a molten brazing material is poured between the fixing bolt 25B and the through hole 28 while being temporarily held by a jig or the like. It is sealed and fixed.

As a result, the direction of the central axis Lb of the fixture 18B can be made parallel to the direction of the central axis La of the electric compressor main body 2, and the spherical portion 15 can be formed by simply forming the through-hole 28. Advantageously, the fixing bolt 25
B can use a bar as it is, which contributes to a reduction in parts cost.

In each of the above-described embodiments, a so-called vertical compressor has been described. However, the present invention is not limited to this. A motor unit and a compression mechanism unit are arranged side by side in a horizontally long sealed case. Housing the connected electric compressor body,
Needless to say, the present invention can also be applied to a so-called horizontal compressor. Further, the compression mechanism 5 is not limited to a rotary type, but is a so-called scroll type,
A helical blade type may be used.

In each of the above embodiments, R410
The description has been made on the premise that a high-pressure refrigerant such as A is used. However, the present invention is not limited to this, and a sealed case may be used as a common component and a conventional refrigerant such as R22 may be used.

[0066]

As described above, according to the present invention, the sealed case has a pressure-resistant structure so as to sufficiently withstand the use of high-pressure refrigerant, and covers the sealed terminal without changing the layout of the surrounding pipes. An effect is achieved in that the work of attaching the cover body to the closed case can be easily performed, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic compressor, showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a structure for attaching a sealed terminal and a cover body covering the sealed terminal to a sealed case according to the embodiment;

FIG. 3 is a diagram illustrating a structure for attaching a sealed terminal and a cover body covering the sealed terminal to a sealed case according to another embodiment.

FIG. 4 is a diagram illustrating a structure for attaching a sealed terminal and a cover body covering the sealed terminal to a sealed case according to still another embodiment.

FIG. 5 is a diagram illustrating a structure for attaching a sealed terminal and a cover body covering the sealed terminal to a sealed case according to still another embodiment.

FIG. 6 is a view for explaining a conventional hermetic compressor, a sealed terminal, and a structure for attaching a cover body covering the sealed terminal to a sealed case.

FIG. 7 is a diagram for explaining a different type of hermetic compressor, a hermetic terminal, and a structure for attaching a cover covering the hermetic terminal to a hermetic case;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Electric motor part, 5 ... Compression mechanism part, 3 ... Rotary shaft, 2 ... Electric compressor main body, 1 ... Sealed case, 15 ... Spherical part, 21 ... Sealed terminal, 22 ... Cover body, 18 ... Fixing device, 25 ... Fixing bolts, 26 nuts, 27 flat parts, 25a lower end head (of fixing bolts), 28 through-holes, 23 fixture receiving parts (nut receiving parts).

Claims (7)

[Claims] 1. An electric compressor main body in which an electric motor unit and a compression mechanism unit are connected via a rotating shaft, a sealed case which houses the electric compressor main body, and whose upper part forms an inclined surface; A sealing terminal which is arranged on the upper inclined surface in a sealed state and is electrically connected to the electric motor unit, a cover body which covers the sealing terminal, and a fixture which mounts and fixes the cover body on the sealing case. The fixing device has an end fixed to the closed case,
A hermetic compressor characterized in that a central axis is directed parallel to a central axis of the electric compressor main body. 2. The hermetic compressor according to claim 1, wherein an upper inclined surface of the hermetic case has a substantially spherical shape. 3. An upper inclined surface of the closed case is provided with a flat portion having a surface perpendicular to a center axis of the electric compressor main body, and the fixing tool end is fixed to the flat portion. The hermetic compressor according to any one of claims 1 and 2, wherein: 4. The sealing device according to claim 1, wherein an end portion of the fixing device to which the sealing case is fixed is formed to have the same inclined shape as an upper inclined surface of the sealing case. Hermetic compressor. 5. The upper inclined surface of the closed case is provided with a hole parallel to the central axis of the electric compressor main body, and the end of the fixture is hermetically fixed to the hole. The hermetic compressor according to any one of claims 1 and 2. 6. The electric vehicle as claimed in claim 1, wherein said cover body has a fixture receiving portion formed on a plane perpendicular to a central axis of said electric compressor main body. A hermetic compressor as described. 7. The hermetic compressor according to claim 1, wherein the compression mechanism compresses a high-pressure refrigerant.