WO2016157236A1

WO2016157236A1 - Fluid machine

Info

Publication number: WO2016157236A1
Application number: PCT/JP2015/001771
Authority: WO
Inventors: 政則伊藤
Original assignee: 三菱電機株式会社
Priority date: 2015-03-27
Filing date: 2015-03-27
Publication date: 2016-10-06
Also published as: JP6366819B2; JPWO2016157236A1

Abstract

There has been a demand for a fluid machine configured so that a sufficient weld length is ensured between the metallic case of an airtight terminal and a mounting hole in a hermetic container to improve the reliability of strength against pressure. This fluid machine comprises a hermetic container, a compression mechanism, an electric motor, and an airtight terminal (26). A welding jig (41a) which is installed within the metallic case (21a) of the airtight terminal (26) and which positions and supports the metallic case (21a) is used when welding the metallic case (21a) to a mounting hole in the hermetic container. A first positioning engagement section (31) is provided at the opening edge (21D) of the metallic case (21a). A second positioning engagement section (42) which engages with the first positioning engagement section (31) of the metallic case (21a) so as to be capable of disengaging therefrom is provided to the welding jig (41a) at a position facing the opening edge (21D) of the metallic case (21a).

Description

Fluid machinery

The present invention relates to a fluid machine for supplying fluid, such as a compressor and a pump.

Conventionally, as this type of fluid machine, a sealed container having a fluid suction port and a fluid discharge port, and a fluid container that is disposed and driven in the sealed container, sucks fluid into the sealed container from the fluid suction port, and discharges the fluid from the fluid discharge port. A compression mechanism, an electric motor that is disposed in the sealed container and drives the compression mechanism, an airtight terminal that is welded in a sealed manner to the mounting hole of the sealed container and is connected to the motor by wiring to supply power to the motor from an external power source; What is made up of is known. The airtight terminal includes a cup-shaped metal case that is welded in a sealed manner to a mounting hole of the hermetic container, a conductive pin disposed in a burring portion formed on a bottom flat portion of the metal case, and a conductive pin and a burring portion. And a glass seal portion that is loaded in between and holds the conductive pins in an insulating state. Thus, when the metal case of the hermetic terminal is welded to the mounting hole of the hermetic container, a welding jig that is inserted into the metal case and positions and supports the metal case is used.
In such a fluid machine, by driving the compression mechanism, the refrigerant is sucked into the sealed container from the refrigeration cycle via the fluid suction port, and after being pressurized by the compression mechanism, is returned to the refrigeration cycle from the fluid discharge port. It has become.

In the conventional fluid machine described above, when the hermetic terminal is welded and fixed to the sealed container, as a positioning, the burring part of the bottom flat part of the metal case at the hermetic terminal is fixed with a welding jig and pressed against the sealed container with a press. In this state, welding is performed. Since the burring portion is fixed in this manner, excessive stress may be applied to the glass seal portion of the burring portion when the hermetic terminal is pressed and welded to the sealed container. When excessive stress is applied in this way, there is a problem that the glass seal portion is broken, fine cracks are generated, or the insulation resistance is lowered. In addition, in order to avoid stress on the burring part, if an attempt is made to increase the clearance between the burring part and the welding jig, a displacement occurs between the hermetic terminal and the sealed container, and the welding length becomes unbalanced. There is also a problem that the welding force is reduced and the pressure resistance is reduced.

Therefore, as shown in Patent Document 1 below, a fluid machine has been proposed that includes an airtight terminal in which the thickness of the side wall portion of the metal case is made thinner than the bottom flat surface portion or ribs are formed on the metal case. Yes. In the technique described in Patent Document 1, the stress applied to the insulating glass seal portion is relieved by suppressing the deformation of the metal case of the airtight terminal against the abnormally high pressure in the sealed container.

JP-A-11-303744

By the way, the technique described in Patent Document 1 can prevent the abnormally high pressure in the sealed container by reducing the thickness of the side wall portion of the metal case in the hermetic terminal from the bottom flat surface portion or by forming a rib on the metal case. In this way, deformation of the metal case of the airtight terminal is suppressed and stress relaxation to the glass seal portion is attempted, but deformation at the time of welding to the sealed container is not taken into consideration.

The present invention has been made to solve the above-described problems, and avoids stress applied to the glass seal portion during welding and prevents misalignment between the airtight terminal and welding jig during welding. Then, it aims at provision of the fluid machine which can ensure sufficient welding length and can improve the reliability of a compressive strength.

A fluid machine according to the present invention includes a sealed container having a fluid suction port and a fluid discharge port, and a compression mechanism that is disposed and driven in the sealed container to suck fluid from the fluid suction port into the sealed container and discharge the fluid from the fluid discharge port. And an electric motor that is disposed in the sealed container and drives the compression mechanism, and an airtight terminal that is welded in a sealed manner to the mounting hole of the sealed container and is connected to the motor to supply power from the external power source to the motor. The hermetic terminal includes a cup-shaped metal case that is welded in a sealed manner to the mounting hole of the hermetic container, a conductive pin disposed in a burring portion formed on a bottom flat portion of the metal case, and a conductive pin and a burring portion. And a glass seal portion that is inserted between and holds the conductive pins in an insulating state, and is inserted into the metal case when the metal case of the hermetic terminal is welded to the mounting hole of the hermetic container. A welding jig for positioning and supporting the metal case is used, a first positioning locking portion is provided at the opening edge of the metal case, and the metal case is located at a position facing the opening edge of the metal case in the welding jig. A second positioning locking portion that is detachably engaged with the first positioning locking portion is provided.

In the fluid machine according to the present invention, the first positioning locking portion is provided at the opening edge of the metal case of the airtight terminal, and the first positioning of the metal case is located at the position where the opening edge of the metal case faces in the welding jig. Since the second positioning locking portion that is detachably engaged with the locking portion is provided, the first positioning locking portion of the opening edge of the metal case is connected to the second of the welding jig during welding. By engaging and fixing the positioning locking portion, the metal case and the welding jig can be accurately positioned at a specified position. Thereby, fixation by the welding jig with respect to the burring part of the bottom plane part of a metal case can be abolished. As a result, it is possible to avoid stress on the glass seal portion during welding and improve the manufacturing quality of the fluid machine. Moreover, since the welding length between the metal case of the airtight terminal and the sealed container can be stabilized, there is an effect that the pressure resistance strength of the entire sealed container can be improved.

It is a front view of the fluid machine which concerns on Embodiment 1 of this invention. It is a fragmentary longitudinal cross-section which shows the inside of the said fluid machine. It is an expanded sectional view which shows the airtight terminal attachment part of the said fluid machine. It is a side view which shows the metal case of the airtight terminal of the said fluid machine. It is a top view which shows the airtight terminal of the said fluid machine. It is a front view which shows the welding jig used for the said fluid machine. It is a side view of the welding jig. It is a top view which shows the state which mounted | wore the airtight terminal with the said welding jig. It is a sectional side view which shows the state which mounted | wore the airtight terminal with the said welding jig. It is a side view which shows the metal case of the airtight terminal in the fluid machine which concerns on Embodiment 2 of this invention. It is a top view which shows the airtight terminal of the said fluid machine. It is a front view which shows the welding jig used for the said fluid machine. It is a side view of the welding jig. It is a top view which shows the state which mounted | wore the airtight terminal with the said welding jig. It is a sectional side view in the state where the welding jig was attached to an airtight terminal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a front view of a fluid machine according to Embodiment 1 of the present invention, FIG. 2 is a partial longitudinal sectional view showing the inside of the fluid machine, and FIG. 3 is an enlarged sectional view showing an airtight terminal mounting portion of the fluid machine. Show.
1 to 3, the fluid machine according to the first embodiment is obtained by improving the positioning method during welding of the hermetic terminal. Here, for example, a scroll compressor that has an orbiting scroll and is used in a refrigerant circuit such as an air conditioner is exemplified as a fluid machine.

The scroll compressor as a fluid machine includes a sealed container 14 having a fluid suction port 17A and a fluid discharge port 18A, and a fluid (refrigerant gas) disposed in the sealed container 14 and driven and driven into the sealed container 14 from the fluid suction port 17A. ) In the sealed container 14 and the mounting hole 19 formed in the sealed container 14 in a sealed manner. It consists of an airtight terminal 26 that is welded and wired to the electric motor 16 through an electric wire 20 to supply power to the electric motor 16 from an external power source. The sealed container 14 is formed in a sealed shape by welding the upper end plate 11 to the upper end edge of the cylindrical container body 12 and welding the lower end plate 13 to the lower end edge of the container body 12. A suction pipe 17 is connected to the fluid suction port 17A of the sealed container 14, and a discharge pipe 18 is connected to the fluid discharge port 18A. A rotary drive unit such as a rocking scroll in the compression mechanism 15 is connected to a rotary drive shaft 16 </ b> A of the electric motor 16.

The airtight terminal 26 includes a cup-shaped metal case 21a that is welded in a sealed manner to the mounting hole 19 of the sealed container 14, and a conductive material disposed in the

burring portions

21B, 21B, and 21B formed in the metal case 21a. Attached to the metal case 21 with the

pins

25, 25, 25, the insulating

glass seal portions

24, 24, 24 loaded between the conductive pins 25 and the burring portions 21 B and holding the conductive pins 25. And a protective hood 23.

4 and 5, the metal case 21a includes a flat disk-shaped bottom flat surface portion 21A, an outer surface portion 21E extending from the periphery of the bottom flat surface portion 21A, and a periphery of the outer surface portion 21E. An opening edge portion 21D extending in a taper shape and extending. The burring

portions

21B, 21B, and 21B are formed on the bottom flat surface portion 21A. A pair of first

positioning locking portions

31 and 31 are provided on the opening edge portion 21D of the metal case 21a. These first

positioning locking portions

31, 31 are formed as concave notches, and are provided at opposing positions on a diagonal L passing through the cup cylinder C of the metal case 21a.

On the other hand, as shown in FIGS. 6 and 7, the welding jig 41a is mounted in the metal case 21a of the hermetic terminal 26, and has a cylindrical shape that supports the back surface of the bottom flat surface portion 21A in the metal case 21a. The outer surface portion 41B and a tapered surface portion 41A that extends from the edge of the outer surface portion 41B and supports the back surface of the opening edge portion 21D of the metal case 21a. Three

pin accommodating spaces

28, 28, 28 for accommodating the respective conductive pins 25 and the glass seal portion 24 are formed on the surface of the outer side surface portion 41B. In the welding jig 41a, second

positioning locking portions

42 and 42 are erected at the position of the tapered surface portion 41A facing the opening edge portion 21D of the mounted metal case 21a. These second

positioning locking portions

42 and 42 are formed as convex portions, are opposed to each other on a diagonal L passing through the cup cylinder C of the metal case 21a, and the welding jig 41a is in the metal case 21a. It is provided at a position where it engages with the first

positioning locking portions

31, 31 of the metal case 21 a when mounted at a specified position for welding.

Therefore, when the metal case 21a of the hermetic terminal 26 is welded to the mounting hole 19 of the sealed container 14 at the welding position 27 (see FIG. 3), as shown in FIGS. 41a is inserted into the metal case 21a, and the second

positioning locking portions

42 and 42 are detachably engaged with the first

positioning locking portions

31 and 31 of the metal case 21a to position the metal case 21a. It comes to support.

Next, the operation will be described.
In the fluid machine configured as described above, the electric motor 16 is supplied with power from an external power source via the hermetic terminal 26 and the electric wire 20. Then, by driving the compression mechanism 15, the refrigerant is sucked into the sealed container 14 from the suction pipe 17 connected to the refrigeration cycle through the fluid suction port 17 </ b> A and pressurized by the compression mechanism 15, and then the fluid discharge port. It is sent out to the refrigeration cycle from the discharge pipe 18 from 18A. Here, when the fluid machine is, for example, a refrigerant compressor, the refrigerant and the refrigerating machine oil circulate in the hermetic container 14. Therefore, in order to secure the insulation resistance of the hermetic terminal 26, The insulating property of the airtight terminal 26 is ensured by applying a silicon coating on the surface to prevent the refrigerant and refrigerator oil from adhering to the surface of the glass seal portion 24.

As described above, in the fluid machine according to the first embodiment, the first positioning locking portion 31 of the opening edge 21D of the metal case 21 is replaced with the second positioning locking portion of the welding jig 41 during welding. By engaging with 42, the metal case 21 and the welding jig 41 can be accurately positioned and fixed at the specified positions. Thereby, the fixing by the welding jig 41 of the glass-insulated burring part 21B of the bottom flat part 21A of the metal case 21 as in the prior art can be eliminated. As a result, it is possible to avoid stress on the insulating glass seal portion 24 during welding and improve the manufacturing quality of the fluid machine. Further, since the welding length can be stabilized, the quality of the pressure strength of the entire sealed container 14 can be improved. In the fluid machine according to the first embodiment, since the positioning accuracy of the metal case 21a and the welding jig 41a is improved, the welding length can be equalized. Thereby, the fluid machine according to the first embodiment can avoid the unbalance of the weld length compared to the case where the positioning is not performed at the time of welding as in the prior art.
In the first embodiment, the metal case 21a is provided with the concave first

positioning locking portions

31 and 31, and the convex second

positioning locking portions

42 and 42 engaged therewith are provided on the welding jig 41a. Although provided, the convex first positioning locking portion may be provided on the metal case 21a, and the concave second positioning locking portion that engages with the first positioning locking portion may be provided on the welding jig 41a.

Embodiment 2. FIG.
In the first embodiment, the first

positioning locking portions

31 and 31 of the hermetic terminal 26 are provided at positions on the diagonal L passing through the cup cylinder C of the metal case 21a. However, the angles are not two points on the diagonal L. You may form in the position. Such a second embodiment is shown in FIGS.
The basic configuration of the airtight terminal 26a and the welding jig 41b according to the second embodiment is the same as that of the airtight terminal 26 and the welding jig 41a shown in the first embodiment. The place where the airtight terminal 26a and the welding jig 41b according to the second embodiment are different from those of the first embodiment is that the first

positioning locking portions

31a and 31a of the metal case 21b in the airtight terminal 26a are Corresponding to being provided at a position (that is, a non-diagonal position) other than on the diagonal line L passing through the cup cylinder C of the metal case 21b as a convex portion, and corresponding to the arrangement of the first

positioning locking portions

31a and 31a. Thus, the second

positioning locking portions

42a and 42a are provided as opposing portions at positions other than the diagonal line L passing through the cup cylinder center C of the welding jig 41b as concave portions. Each 2nd positioning latching | locking part 42a is the arrangement | positioning which engages the 1st positioning latching | locking part 31a so that engagement / disengagement is possible.

As described above, in the fluid machine according to the second embodiment, as in the first embodiment, the metal case 21b and the welding jig 41b of the hermetic terminal 26a are provided with concavities and convexities that are engaged for positioning. The positioning at the time of welding can be performed not at the glass seal portion 24 and the conductive pin 25 but at the metal case 21b. Therefore, unlike the fluid machine described in Patent Document 1, the fluid machine according to Embodiment 2 can avoid damage to the glass seal portion 24 when welding the airtight terminal 26a to the sealed container 14, As with the first embodiment, the quality of the fluid machine can be improved. In addition, the fluid machine according to the second embodiment can reliably prevent the reverse phase attachment from being reversed by 180 degrees by the engagement of the concavo-convex portion at the non-diagonal position. For this reason, the fluid machine according to the second embodiment can further improve the quality with respect to the deterioration of the insulation resistance of the terminal portion of the fluid machine as compared with the fluid machine shown in the first embodiment.

In the second embodiment, convex first

positioning locking portions

31a, 31a are provided on the metal case 21b, and concave positioning second

positioning locking portions

42a, 42a, 42a, 42a are formed. However, a concave first positioning locking portion may be provided on the metal case 21b, and a convex second positioning locking portion may be provided on the welding jig 41b.
The fluid applied to the fluid machine of the present invention is not limited to the refrigerant exemplified in the first and second embodiments, and may be a gas such as air or carbon dioxide, or a liquid such as water or alcohol. .

14 Sealed container 15 Compression mechanism 16 Electric motor 16A Rotation drive shaft 17A Fluid suction port 18A Fluid discharge port 19 Mounting

holes

21a and 21b Metal case 21A Bottom flat surface portion 21B Burring portion 21D Opening edge portion 24 Glass seal portion 25 Conductive pins 26 and

26a Airtight terminals

31, 31a First positioning locking

portions

41a, 41b Welding jig 41A Tapered

surface portions

42, 42a Second positioning locking portions C Cup cylinder L Diagonal line

Claims

A sealed container having a fluid suction port and a fluid discharge port; a compression mechanism that is disposed and driven in the sealed container and sucks fluid from the fluid suction port into the sealed container and discharges the fluid from the fluid discharge port; An electric motor arranged in a container for driving the compression mechanism, and an airtight terminal for sealingly welding to the mounting hole of the hermetic container and being connected to the electric motor to feed an external power source to the electric motor; Configured,
The airtight terminal includes a cup-shaped metal case welded in a sealed manner to the mounting hole of the hermetic container, a conductive pin disposed in a burring portion formed on a bottom flat portion of the metal case, the conductive pin, and the A glass seal portion that is loaded between the burring portions and holds the conductive pins in an insulating state.
When the metal case of the hermetic terminal is welded to the mounting hole of the sealed container, a welding jig is used that is inserted into the metal case and supports the positioning of the metal case.
A first positioning locking portion is provided at the opening edge of the metal case, and the first positioning locking portion of the metal case is engaged with the welding jig at a position facing the opening edge of the metal case. A fluid machine characterized in that a second positioning locking portion that is detachably engaged is provided.
2. The fluid machine according to claim 1, wherein the first positioning locking portion of the metal case of the airtight terminal is provided at a position on a diagonal line passing through the cup cylinder of the metal case.
2. The fluid machine according to claim 1, wherein the first positioning locking portion of the metal case of the hermetic terminal is provided at a position other than a diagonal line passing through the cup core of the metal case.